HIDDEN LIGHTING LAMP USING COLOR CONVERSION MATERIALS AND VEHICLES HAVING SAME

Abstract

A hidden lighting lamp uses a color conversion material and is applied to a vehicle. A color conversion member is spaced apart from a light source by a light source air gap (La) such that the color conversion member is integrally engaged with a lens for projecting light of the light source to the outside or such that the color conversion member is spaced apart from the lens by a lens air gap (Lb). Hidden lighting without deterioration of optical efficiency of LED light from the light source is thereby implemented. One or more of a black painting, a coating layer, an application layer, and a deposition layer are provided, thereby providing concealment of the lamp inner space of the lens, anti-peeling of a deposit, and diversity of fluorescent color.

Claims

1. A hidden lighting lamp comprising: a light source; a lens projecting light of the light source to an outside of the hidden lighting lamp; and a color conversion member spaced apart from the light source by a first air gap to form a transmission path of light energy emitted from the light source.

2. The hidden lighting lamp of claim 1, wherein the color conversion member is integrally engaged with the lens or separated from the lens by a second air gap, in a state of being spaced apart from the light source by the first air gap.

3. The hidden lighting lamp of claim 1, wherein the light source is a light-emitting diode (LED) chip.

4. The hidden lighting lamp of claim 1, wherein the color conversion member comprises: a phosphor layer having a fluorescent material; and a front-phosphor layer between the phosphor layer and the lens.

5. The hidden lighting lamp of claim 4, wherein the phosphor layer is modified into a plurality of phosphor layers having different phosphor colors by varying a thickness or an added amount of phosphor material, wherein a phosphor composition change or a combination of the phosphor with other materials is performed to improve color rendering index (CRI).

6. The hidden lighting lamp of claim 4, wherein the phosphor layer is composed of a plurality of color phosphor particles having different phosphor color, and wherein the color phosphor particles are contained in the front-phosphor layer.

7. The hidden lighting lamp of claim 4, wherein the phosphor layer comprises a rear-phosphor layer having the same color base as a color of light from the light source and disposed between the light source and the phosphor layer, and wherein the rear-phosphor layer contains an additive having the same color base as the light from the light source and an additional additive to adjust light transmittance.

8. The hidden lighting lamp of claim 7, wherein the rear-phosphor layer is modified into a plurality of transparent layers each containing a plurality of color phosphor particles having different color.

9. The hidden lighting lamp of claim 1, wherein the color conversion member is modified into an optical feature having an optical function with any one of a convex part, a concave part, or a Fresnel cut part applied thereto.

10. The hidden lighting lamp of claim 4, wherein the front-phosphor layer forms an integrated structure or a separated structure with respect to the lens, and the front-phosphor layer is modified into any one of a deposition layer, a painting layer, a top coating layer, a color painting layer and a base coating layer.

11. The hidden lighting lamp of claim 10, wherein a light transmission hole is formed in each of the deposition layer, the coating layer, the top coating layer, the color coating layer and the base coating layer to increase light transmittance.

12. The hidden lighting lamp of claim 10, wherein the deposition layer is formed of an aluminum (Al) material or a nickel-chromium (Ni—Cr) material.

13. The hidden lighting lamp of claim 10, wherein the painting layer is formed of a paint, and the color painting layer is formed of a paint of various colors suitable for realization of design aesthetics.

14. The hidden lighting lamp of claim 10, wherein the top coating layer is combined with the deposition layer to prevent delamination of the deposition layer.

15. The hidden lighting lamp of claim 10, wherein the base coating layer is combined with the deposition layer and the top coating layer to prevent delamination of the deposited layer or with the color painting layer and the top coating layer to prevent delamination of the color painting layer.

16. A vehicle comprising: an exterior component; and a hidden lighting lamp provided in a vehicle part where the exterior component is disposed and comprising a color conversion member integrally engaged with a lens for projecting light of a light source to the outside, or separated from the lens by a second air gap, in a state of being spaced apart from the light source by a first air gap.

17. The vehicle of claim 16, wherein the hidden lighting lamp is any one of a headlamp, a tail lamp, a fog lamp, a turn signal lamp, a side repeater, an emergency light, a brake lamp, and a backup lamp.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG. 1 is a diagram illustrating the configuration of a hidden lighting lamp using a color conversion material applied to a vehicle according to the present disclosure;

[0041] FIG. 2 is a diagram illustrating the state in which inside light passes and external light is blocked through phosphor, which is a color conversion material, in the lens of the hidden lighting lamp according to the present disclosure;

[0042] FIG. 3 is a diagram illustrating the configuration of a hidden lens through phosphor, which is a color conversion material, in the lens of the hidden lighting lamp according to the present disclosure;

[0043] FIG. 4 is a diagram illustrating the configuration in which the lens and the color conversion member of the hidden lens are variously configured in an integrated structure according to the present disclosure;

[0044] FIG. 5 is a diagram illustrating the configuration in which the lens and the color conversion member of the hidden lens are variously configured in a separated structure according to the present disclosure;

[0045] FIG. 6 is a diagram illustrating the use of phosphor among color conversion members constituting a hidden lens according to the present disclosure;

[0046] FIG. 7 is a diagram illustrating the configuration in which a deposition/cover/coating layer among color conversion members constituting an integrated/separated-type hidden lens is variously configured together with a light transmittance hole according to the present disclosure; and

[0047] FIG. 8 is a diagram illustrating a lamp lighting state for each case structure of a hidden lighting lamp using a color conversion material according to the present disclosure.

DESCRIPTION OF SPECIFIC EMBODIMENTS

[0048] Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings. The embodiments are illustrative and may be implemented by those having ordinary skill in the art to which the present disclosure pertains in various different forms. Thus, the present disclosure is not limited to the embodiments described herein.

[0049] FIG. 1 and FIG. 2 illustrate components of a hidden lighting lamp 10.

[0050] Referring to FIG. 1, a vehicle 1 includes a hidden lighting lamp 10. The hidden lighting lamp 10 is illustrated as a headlamp provided in the exterior part 1-1 (e.g., bumper) of the front side of the vehicle. The hidden lighting lamp may not only be a tail lamp provided on the rear side of the vehicle but may also be any one of a fog lamp, a turn signal lamp, a side repeater, an emergency light, a brake lamp, and/or a backup lamp.

[0051] For example, the hidden lighting lamp 10 is composed of a light source 20 that generates light into the inner space of the lamp, and a hidden lens 30 is disposed in front of the light source 20 with a light source air gap La (or a first air gap La) interposed therebetween. The light source 20 is a light-emitting diode (LED) chip, which is generally referred to as an LED that generates light during current application according to the principle of a PN junction light-emitting diode. The LED includes a plurality of LEDs that respectively emit light of various colors having a wavelength of 400 nm to 500 nm.

[0052] In particular, the hidden lens 30 is essentially composed of a lens 40 and a color conversion member 50. The lens 40 is an outer lens that is an externally exposed part through which inside light is emitted from the light source to the outside of the lamp. The lens 40 is also formed of any one of polycarbonates (PC) plastic, glass, and polymethyl methacrylate (PMMA).

[0053] In addition, the color conversion member 50 serves to block external light (e.g., sunlight) while performing color correction for the inside light generated when the light source 20 is turned on. The color conversion member 50 is formed in an integrated structure with the lens 40. However, if necessary, the color conversion member 50 may be formed in a separated structure with respect to the lens 40 (see FIG. 5).

[0054] In addition, the light source air gap La (or the first air gap La) forms a propagation distance of light from the light source 20 to the color conversion member 50. The propagation distance is also referred to as an anti-phosphor-deterioration distance of phosphor, which is applied to the color conversion member 50. This anti-phosphor-deterioration distance allows a high-temperature light energy transmitted from the LED of the light source 20 directly to the phosphor to be greatly mitigated, thereby contributing to securing the VOCs' robustness for the phosphor of the color conversion member 50 and improving the thermal performance of the LED chip of the light source 20.

[0055] Therefore, the hidden lighting lamp 10 is characterized as a hidden lighting lamp using a color conversion material.

[0056] In FIG. 2, the black and white graph describes a system including a phosphor layer that converts light to a transparent lens and an LED CHIP of the same color as an outside light blocking layer that efficiently penetrates the same color as the LED CHIP. In the graph, the x-axis is the wavelength range (nm), and the y-axis is the transmittance (%). The wavelength range with high transmittance is the same wavelength range as the LED CHIP (blue), and the wavelength range with low transmittance is the same wavelength range as the outside light and phosphor (yellow).

[0057] Referring to FIG. 2, the color conversion member 50 is composed of a phosphor layer 60 that converts light in the transparent lens 40 and a rear-phosphor layer 70 (or LED color external light-blocking transparent layer) that efficiently transmits the same color as the LED chip.

[0058] For example, the phosphor layer 60 applies phosphor as a color conversion material that performs color correction by changing the light wavelength of the inside light generated by the LED when the light source 20 is turned on.

[0059] In particular, when receiving light with a wavelength of 400 nm to 500 nm, the phosphor layer 60 is excited into light of approximately 550 nm wavelength and then returns to the ground state so as to convert the LED light of the light source 20 into light having a long wavelength of 400 nm to 700 nm.

[0060] In addition, the phosphor layer 60 may change in composition or have a combined composition with other materials to expand the width of a wavelength of converted light so as to improve color rendering index (CRI) (i.e., to increase the value of CRI). Further, since the phosphor layer 60 has a tendency to have a warm feeling (WARM) chromaticity in order to match the white chromaticity or as the deposition amount on the lens 40 increases, the amount of phosphor used for the WARM color can be reduced.

[0061] For example, the rear-phosphor layer 70 is a transparent layer that protects the phosphor of the phosphor layer 60 and blocks a portion of light due to an LED color-based additive and other additives so that the light transmittance becomes approximately 99% or less.

[0062] In particular, the rear-phosphor layer 70 significantly reduces or eliminates the LED color, thereby increasing the light transmittance and thus improving optical efficiency.

[0063] Therefore, if a phosphor protection material is already added to or mixed with the phosphor composition of the phosphor layer 60 in the color conversion member 50, the color conversion member 50 may be only composed of the phosphor layer 60 without the rear-phosphor layer 70.

[0064] Furthermore, the color conversion member 50 forms an integrated structure with the lens 40 by positioning the phosphor layer 60 toward the lens 40 and positioning the rear-phosphor layer 70 toward the light source 20. The reason for this is as follows. If the phosphor layer 60 is positioned closer to the light source 20 than the rear-phosphor layer 70, light is first converted in the phosphor layer 60 and then transmits through the rear-phosphor layer 70, so that a portion of the converted light is blocked by the rear-phosphor layer 70, resulting in decreased light transmittance and a color shift. Thus, enabling the LED light having an LED color emitted from the light source 20 to first meet the rear-phosphor layer 70 prior to the phosphor layer 60 can increase the light transmittance.

[0065] In this way, the color conversion member 50 is arranged in the order of the lens 40-the phosphor layer 60-the rear-phosphor layer 70 in a state of being spaced apart from the light source 20. Thus, the rear-phosphor layer 70 effectively transmits the LED spectrum in the lamp inner space, thereby reducing the decrease in optical efficiency. Further, the external light (e.g., sunlight) that can transmit through both the phosphor and the layers 60 and 70, used for blocking external light, is effectively blocked, thereby effectively implementing the hidden lighting. In this case, “-” means an arrangement state that is arranged in the front-rear direction.

[0066] In particular, since the phosphor layer 60 is directly located on the lens 40, re-reflectance decreases due to the exclusion of the physical distance, and thus improved light transmittance is utilized so that the same amount of light is emitted with less power consumption, thereby possibly increasing the energy efficiency. The characteristic solves the disadvantage that, in the case of the lens 40 and the phosphor layer 60 being separated as in the related art, due to a decrease in the transmittance of light from the light source 20, a large number of LEDs are required to implement a lighting function.

[0067] On the other hand, referring to FIG. 3, the color conversion member 50 is composed of a phosphor layer 60 that converts light in a transparent lens 40, a rear-phosphor layer 70 (or LED color external light-blocking transparent layer) that efficiently transmits the same color as the LED chip, and a front-phosphor layer 80 (or lens-attachment layer).

[0068] For example, the front-phosphor layer 80 is formed of an aluminum (AL) material interposed between the lens 40 and the phosphor layer 60 to allow inside light to be transmitted while reflecting external light (e.g., sunlight), thereby contributing to the concealment of the internal components of the lamp when the light source 20 is not turned on. In this case, the aluminum (AL) can be replaced with other materials. Among these materials, although chromium (Cr) material can be used at low temperatures, cracks may occur at high temperatures. Therefore, a single Cr material is not solely adapted, but nickel-chromium (Ni—Cr) material may be applied.

[0069] In particular, the front-phosphor layer 80 may be formed by painting or coating, in addition to deposition.

[0070] Meanwhile, FIGS. 4 and 5 illustrate a hidden lens 30 having an integrated structure of a lens 40 and a color conversion member 50 and a separated structure of a lens 40 and a color conversion member 50, respectively.

[0071] Referring to the integrated structure type hidden lens 30 of FIG. 4, the lens 40 may be replaced with a plastic exterior part 40-1 or a color plastic exterior part 40-2. In the color conversion member 50, the phosphor layer 60 may be composed of a first phosphor layer 60a or a second phosphor layer 60b. The rear-phosphor layer 70 may be composed of a first transparent layer 70a or a second transparent layer 70b, and the front-phosphor layer 80 may be composed of a deposition layer 80a or a painting layer 80b.

[0072] On the other hand, referring to the separated structure type hidden lens 30 of FIG. 5, among the phosphor layer 60, the rear-phosphor layer 70, and the front-phosphor layer 80 of the color conversion member 50, the front-phosphor layer 80 or the phosphor layer 60 is spaced away backward from the lens 40 with a lens air gap Lb (or a second air gap Lb) interposed therebetween. In this case, the lens air gap Lb serves to scatter the inside light transmitted from the phosphor layer 60 into the empty space of the lens air gap between the lens 40 and the phosphor layer 60, which contributes to the effective use of light.

[0073] In this arrangement, the integrated structure type hidden lens 30 may be modified into first to ninth (1 to 9) iterations of integrated structure type hidden lenses 30. The separated structure type hidden lens 30 may be modified into first to ninth (1 to 9) iterations of separated structure type hidden lenses 30. Hereinafter, “-” means an arrangement state that is arranged in the front-rear direction.

[0074] For example, each of the first and second integrated structure type hidden lenses 30 is composed of a lens 40-a deposition layer 80a-a first phosphor layer 60a-a second transparent layer 70b. In addition, each of the first and second separated structure type hidden lenses 30 is composed of a lens 40-a deposition layer 80a-a lens air gap Lb (or a second air gap Lb)-a first phosphor layer 60a-a second transparent layer 70b.

[0075] In this arrangement, the lens 40 is a transparent lens, and the deposition layer 80a is formed of Al or Ni—Cr material that reflects external light. Further, in this arrangement the first phosphor layer 60a is formed of phosphor that converts a 400 to 500 nm wavelength to a long wavelength of 400 to 700 nm. The second transparent layer 70b is added with an LED color-based additive and other additives to protect the first phosphor layer 60a while blocking a part of light.

[0076] Therefore, the first and second integrated/separated structure type hidden lenses 30 may be formed differently by varying the thickness or added amount of the deposition layer 80a or the second transparent layer 70b with respect to the first phosphor layer 60a.

[0077] For example, the third integrated structure type hidden lens 30 is composed of a lens 40-a painting layer 80b-a first phosphor layer 60a-a first transparent layer 70a. The third separated structure type hidden lens 30 is composed of a lens 40-a painting layer 80b-a lens air gap Lb (or a second air gap Lb)-a first phosphor layer 60a-a first transparent layer 70a. In addition, the fourth integrated structure type hidden lens 30 is composed of a lens 40-a painting layer 80b-a first phosphor layer 60a-a second transparent layer 70b. The fourth separated structure type hidden lens 30 is composed of a lens 40-a painting layer 80b-a lens air gap Lb (or a second air gap Lb)-a first phosphor layer 60a-a second transparent layer 70b.

[0078] In this arrangement, the lens 40 is a transparent lens, and the painting layer 80b is a layer that reflects external light while enhancing the aesthetic sensibility in design of a color paint of various colors. Further in this arrangement, the first phosphor layer 60a is formed of phosphor that converts light having a 400 nm to 500 nm wavelength to light having a long wavelength of 400 to 700 nm. The first transparent layer 70a and the second transparent layer 70b are added with an LED color-based additive and other additives to protect the first phosphor layer 60a while blocking a part of light.

[0079] Therefore, the third integrated/separated structure type hidden lens 30 or the fourth integrated/separated structure type hidden lens 30 may be formed differently by changing a color of the painting layer 80b to differentiate the aesthetic sensibility in design and by varying the thickness or the added amount of each of the first transparent layer 70a and the second transparent layer 70b, with respect to the first phosphor layer 60a.

[0080] For example, the fifth integrated structure type hidden lens 30 is composed of a lens 40-a second phosphor layer 60b-a second transparent layer 70b. The fifth separated structure type hidden lens 30 is composed of a lens 40-a lens air gap Lb (or a second air gap Lb)-a second phosphor layer 60b-a second transparent layer 70b. In addition, the sixth integrated structure type hidden lens 30 is composed of a lens 40-a first phosphor layer 60a-a second transparent layer 70b. The sixth separated structure type hidden lens 30 is composed of a lens 40-a lens air gap Lb (or a second air gap Lb)-a first phosphor layer 60a-a second transparent layer 70b.

[0081] In this arrangement, the lens 40 is a transparent lens, and the first phosphor layer 60a and the second phosphor layer 60b are formed of phosphor that converts light having a 400 nm to 500 nm wavelength to light having a long wavelength of 400 to 700 nm. Further in this arrangement, the second transparent layer 70b is added with an LED color-based additive and other additives to protect the first phosphor layer 60a or second phosphor layer 60b while blocking a part of light.

[0082] Therefore, the fifth integrated/structure type hidden lens 30 or the sixth integrated structure type hidden lens 30 may be formed differently by employing various kinds of materials to be combined with the phosphor in the first phosphor layer 60a and the second phosphor layer 60b to provide different fluorescent colors with different CRIs. Further, the fifth integrated/structure type hidden lens 30 or the sixth integrated structure type hidden lens 30 may be formed differently by varying the thickness or the added amount of the second transparent layer 70b with respect to the first phosphor layer 60a or the second phosphor layer 60b.

[0083] For example, the seventh integrated structure type hidden lens 30 is composed of a plastic exterior part 40-1 or a color plastic exterior part 40-2-a first phosphor layer 60a-a first transparent layer 70a. The seventh separated structure type hidden lens 30 is composed of a plastic exterior part 40-1 or a color plastic exterior part 40-2-a lens air gap Lb (or a second air gap Lb)-a first phosphor layer 60a-a first transparent layer 70a.

[0084] In addition, the eighth integrated structure type hidden lens 30 is composed of a plastic exterior part 40-1 or a color plastic exterior part 40-2-a first phosphor layer 60a-a second transparent layer 70b. The eighth separated structure type hidden lens 30 is composed of a plastic exterior part 40-1 or a color plastic exterior part 40-2-a lens air gap Lb (or a second air gap Lb)-a first phosphor layer 60a-a second transparent layer 70b.

[0085] In addition, the ninth integrated structure type hidden lens 30 is composed of a plastic exterior part 40-1 or a color plastic exterior part 40-2-a second phosphor layer 60b-a second transparent layer 70b. The ninth separated structure type hidden lens 30 is composed of a plastic exterior part 40-1 or a color plastic exterior part 40-2-a lens air gap Lb (or a second air gap Lb)-a second phosphor layer 60b-a second transparent layer 70b.

[0086] In this arrangement, the plastic exterior part 40-1 and the color plastic exterior part 40-2 are outer lenses that replace the lens 40 and a painting layer or a deposition layer attached thereto. The first phosphor layer 60a and the second phosphor layer 60b are formed of phosphor that converts light having a wavelength of 400 nm to 500 nm to light having a long wavelength of 400 to 700 nm. The first transparent layer 70a and the second transparent layer 70b are added with an LED color-based additive and other additives to protect the first phosphor layer 60a or the second phosphor layer 60b while blocking a part of light.

[0087] In particular, each of the first phosphor layer 60a and the second phosphor layer 60b is applied with combined physical properties of the phosphor to correct a color shift caused by a combination of color of the color plastic exterior part 40-2 and the phosphor.

[0088] Therefore, the seventh integrated structure type hidden lens 30, the eighth integrated structure type hidden lens 30, or the ninth integrated structure type hidden lens 30 may be selectively formed by employing various kinds of materials to be combined with the phosphor in the first phosphor layer 60a and the second phosphor layer 60b to provide different fluorescent colors with different CRIs. Further, the seventh integrated structure type hidden lens 30, the eighth integrated structure type hidden lens 30, or the ninth integrated structure type hidden lens 30 may be selectively formed by varying the thickness or the added amount of the first transparent layer 70a or the second transparent layer 70b with respect to the first phosphor layer 60a or the second phosphor layer 60b.

[0089] FIG. 6 illustrates various modifications and combinations of a phosphor layer 60 and a rear-phosphor layer 70 implemented into a color conversion member 50.

[0090] As illustrated, the color conversion member 50 is modified to have a phosphor layer 60, which is applied with any one kind of particles, including first color phosphor particles 61a, second color phosphor particles 61b, and third color phosphor particles 61c, as a phosphor particle 61, or with any one of a first phosphor layer 60a, a second phosphor layer 60b, a third phosphor layer 60c, and a fourth phosphor layer 60d as a modified structure.

[0091] In addition, the color conversion member 50 is modified to have a rear-phosphor layer 70, which is formed with the addition of an LED color-based additive as a base additive to block a part of light and an additional additive 72 to adjust the light transmittance. Alternatively, the color conversion member is modified to have any one of a third transparent layer 70c, a fourth transparent layer 70d, and a fifth transparent layer 70e other than the first and second transparent layers 70a and 70b, or an optical feature 70f.

[0092] Specifically, the color conversion member 50 combines the phosphor particles 61 (any one kind of particles among the phosphor particles 61a, 61b, and 61c) and the rear-phosphor layer 70, which is formed with any one of the third transparent layer 70c, the fourth transparent layer 70d, and the fifth transparent layer 70e, or with the optical feature 70f.

[0093] In particular, each of the third, fourth, and fifth transparent layers 70c, 70d, and 70e is added with an additional additive 72 to increase a light blocking function.

[0094] Therefore, the third transparent layer 70c contains the first color phosphor particles 61a together with the additional additive 72 to provide the first color of the phosphor particles as a lighting color while increasing the light blocking function.

[0095] In addition, the fourth transparent layer 70d contains the first color phosphor particles 61a and the second color phosphor particles 61b together with the additional additive 72 to provide a combined color of the first color and the second color of the phosphor particles as a lighting color while increasing a light blocking function.

[0096] In addition, the fifth transparent layer 70e contains the first color phosphor particles 61a, the second color phosphor particles 61b, and the third color phosphor particles 61c together with the additional additive 72 to provide a combined color of the first color, the second color, and the third color of the phosphor particles as a lighting color while increasing the light blocking function.

[0097] For example, the phosphor layer 60 may be modified to have a first phosphor layer 60a, which is combined with a fourth transparent layer 70d modified from the rear-phosphor layer 70, thereby obtaining harmony with the LED color of the light source 20 and light transmittance adjustment by the fourth transparent layer 70d.

[0098] Specifically, the color conversion member 50 combines the phosphor layer 60 modified into any one of the phosphor layers 60a, 60b, 60c, 60d, and the rear-phosphor layer 70. The phosphor layer 60 is modified into the first phosphor layer 60a, a combination of the first phosphor layer 60a and the third phosphor layer 60c, or a combination of the first phosphor layer 60a, the third phosphor layer 60c, and the fourth phosphor layer 60d.

[0099] Therefore, each of the phosphor layers 60a, 60b, 60c, and 60d may be combined with the optical feature 70f, which is one of the modified structures of the rear-phosphor layer 70. Thus, the diversified change of the phosphor color by the selective combination of the first, third, and fourth phosphor layers 60a, 60c, and 60d can be obtained, in addition to the harmony with the LED color of the light source 20 by the optical feature 70f and the light transmittance adjustment.

[0100] Furthermore, the optical feature 70f may be modified to have a shape of any one of a convex part 77, a concave part 78, and a Fresnel cut part 79, which can improve the optical performance.

[0101] Therefore, the color conversion member 50 may be configured such that the phosphor layer 60, modified into the first phosphor layer 60a among the phosphor layers 60a, 60b, 60c, and 60d, is combined with the convex part 77, the concave part 78, and the Fresnel cut part 79 of the rear-phosphor layer 70, which is modified into the optical feature 70f, to improve optical performance. The first phosphor layer 60a can effectively utilize LED light of the light source 20 through the convex part 77/the concave part 78/the Fresnel cut part 79.

[0102] FIG. 7 illustrates various modifications to the front-phosphor layer 80.

[0103] As illustrated, the front-phosphor layer 80 is modified into any one of a deposition layer 80a, a painting layer 80b, a top coating layer 80c, a color painting layer 80d, and a base coating layer 80e, which is perforated with light transmission micro-holes 81 when being applied to the integrated structure type hidden lens 30 or the separated structure type hidden lens 30. Thus, the light transmittance of the inside light transmitting through the front-phosphor layer 80 from the phosphor layer 60 is increased.

[0104] For example, the deposition layer 80a is attached to the lens 40 through Al or Ni—Cr deposition to reflect light. In addition, the painting layer 80b is attached to the lens 40 through painting of various colors to reflect light. The painting layer replaces the deposition layer 80a.

[0105] For example, the top coating layer 80c is formed on the deposition layer 80a to prevent peeling of the deposition layer 80a. In addition, the color painting layer 80d is applied with various colors for the aesthetic sensibility in design of the hidden lighting lamp 10.

[0106] For example, the base coating layer 80e is composed of a combination of the deposition layer 80a and the top coating layer 80c or a combination of the color painting layer 80d and the top coating layer 80c. The base coating layer is applied to facilitate the progress of deposition or painting when the characteristics of the deposition or of the coating do not match with the material characteristics of the lens 40.

[0107] In particular, the top coating, painting, and base coating may be applied as additional processing operations to prevent the deposition peeling occurring in a state in which a separate layer such as the phosphor layer 60 does not exist after the deposition layer 80a is applied.

[0108] FIG. 8 illustrates an external recognition state when the light source of the hidden lighting lamp 10 is not turned on and a lighting state when the light source is turned on. Although this case illustrates that the color conversion member 50 sets the LED light transmittance of the light source 20 to 20% compared to 100%, the transmittance of the color conversion member 50 may be diversely adjusted to have a range of 90% to 10%.

[0109] As illustrated, the hidden lighting lamp 10 includes a hidden lens 30 composed of a lens 40 and a color conversion member 50 consisting or comprised of a phosphor layer 60, a rear-phosphor layer 70 (or an LED color external light-blocking transparent layer), and a front-phosphor layer 80 (or a lens-attachment layer) to transmit the LED light of the light source 20 therethrough to provide illumination of the hidden lighting lamp 10.

[0110] In particular, the hidden lighting lamp 10 has light transmission micro-holes 81 perforated in the front-phosphor layer 80 (or the lens-attachment layer), which can increase the light transmittance of the light source 20.

[0111] Further, the hidden lighting lamp 10 is applied with an integrated structure type hidden lens 30 or a separated structure type hidden lens 30 with respect to the lens 40 with a light source air gap La (or a first air gap La) provided therein so that LED light does not rapidly increase the phosphor energy of the phosphor layer 60 in the inside lamp to secure VOCs robustness for phosphor, and with a lens air gap Lb (or a second air gap Lb) provided therein so that light exiting the phosphor layer 60 from the light source is scattered in the inside lamp to allow for effective use of light.

[0112] As described above, the hidden lighting lamp 10 using the color conversion material applied to a vehicle 1, according to the present embodiment, is configured so that the color conversion member 50 is spaced apart from the light source 20 by the light source air gap La (or the first air gap La) such that the color conversion member is integrally engaged with the lens 40 for projecting light of the light source 20 to the outside. Alternatively, the hidden lighting lamp 10, using the color conversion material, is configured such that the color conversion member is spaced apart from the lens 40 by the lens air gap Lb (or the second air gap Lb). Thus, the phosphor implementing color conversion and external concealment of the lamp inner space can implement hidden lighting in association with the lens 40 without deterioration of optical efficiency of the LED light of the light source 20.

[0113] In particular, according to the hidden lighting lamp 10 of the vehicle 1, phosphor is matched with one or more of a black painting, a coating layer, an application layer, and a deposition layer in the lens 40 to provide concealment of the lamp inner space, anti-peeling of a deposit, and diversity of fluorescent color. Further, the light source air gap La is provided between the LED of the light source 20 and the lens 40 to maintain VOCs robustness and to increase the light transmittance.