Bulb for semiconductor luminous device, and semiconductor luminous device

Abstract

A bulb for a semiconductor luminous device is provided. The bulb is three-dimensionally extended and includes at least one optically effective surface structure. A semiconductor luminous device may include at least one semiconductor light source and an optically transmissive bulb for transmitting light emitted by the at least one semiconductor light source, the bulb being three-dimensionally extended and comprising at least one optically effective surface structure, wherein the bulb encloses at least one semiconductor light source.

Claims

1. A semiconductor luminous device, comprising at least one semiconductor light source and an optically transmissive bulb for transmitting light emitted by the at least one semiconductor light source, wherein the bulb is three-dimensionally extended and comprises a plurality of optically effective surface structures, wherein each of the optically effective surface structures comprises an optical element and a corresponding through-bore through the bulb, wherein each optical element is configured to be insertable into the corresponding through-bore from an outer side of the bulb and to extend laterally beyond the bulb.

2. The semiconductor luminous device as claimed in claim 1, wherein each optical element comprises a hollow cylindrical base.

3. The semiconductor luminous device as claimed in claim 2, wherein each optical element further comprises at least two annular elevations.

4. The semiconductor luminous device as claimed in claim 1, wherein the bulb comprises a backward bearing edge.

5. The semiconductor luminous device as claimed in claim 4, further comprising a heat sink, wherein the bulb is fitted onto the heat sink by means of the bearing edge.

6. The semiconductor luminous device as claimed in claim 1, wherein the bulb comprises at least one recess, for receiving at least one light source, on a bearing surface.

7. The semiconductor luminous device as claimed in claim 1, wherein the optically effective surface structures are arranged in the bulb on a region of a largest lateral extent.

8. The semiconductor luminous device as claimed in claim 1, wherein at least one of the semiconductor light sources is configured to emit light in a lateral direction.

9. The semiconductor luminous device as claimed in claim 1, wherein at least one of the semiconductor light sources is configured to have its main emission direction directed towards one of the optical elements.

10. A semiconductor luminous device, comprising at least one semiconductor light source and an optically transmissive bulb for transmitting light emitted by the at least one a semiconductor light source, wherein the bulb is three-dimensionally extended and comprises a plurality of optically effective surface structures, wherein the plurality of optically effective surface structures comprises a plurality of through-bores through the bulb and a plurality of optical elements, wherein each optical element comprises a hollow cylindrical base and two annular elevations on the outer lateral surface of the cylindrical base wherein each optical element is inserted into a through-bore of the plurality of through-bores from an outer side of the bulb and extends laterally beyond the bulb, wherein the plurality of optical elements is configured to direct light emitted by the at least one semiconductor light source into a rearward direction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the drawings, like reference characters generally refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the disclosed embodiments. In the following description, various embodiments described with reference to the following drawings, in which:

(2) FIG. 1 shows a bulb according to a first embodiment, together with a luminous unit, in a view obliquely from below;

(3) FIG. 2 shows a luminous device including the bulb according to the first embodiment in a side view;

(4) FIG. 3 shows the bulb according to the first embodiment in a plan view;

(5) FIG. 4 shows a bulb according to a second embodiment, together with a plurality of light-emitting diodes, in side view;

(6) FIG. 5 shows the bulb according to the second embodiment, with the light-emitting diodes, as a sectional representation in side view;

(7) FIG. 6 shows the bulb according to the second embodiment in a view obliquely from below;

(8) FIG. 7 shows a bulb according to a third embodiment in a side view;

(9) FIG. 8 shows the bulb according to the third embodiment as a sectional representation in side view;

(10) FIG. 9 shows a bulb according to a fourth embodiment, together with a light-emitting diode, in a side view.

DETAILED DESCRIPTION

(11) The following detailed description refers to the accompanying drawing that show, by way of illustration, specific details and embodiments in which the disclosure may be practiced.

(12) FIG. 1 shows elements of a luminous device 100 in a view obliquely from below, namely a bulb 101 according to a first embodiment together with a luminous unit 102. FIG. 2 shows the luminous device 100 with the bulb 101 in a side view. FIG. 3 shows the bulb 101 in a plan view.

(13) The bulb 101 has a base shape in the form of a spherical cap, in particular an at least approximately hemispherical base shape, and is consequently three-dimensionally extended. The bulb 101 has a (front) tip 103 and a (backward or rear) bearing edge 104. The bulb 101 may be fitted in particular onto a heat sink (not shown) of the luminous device 100 by means of the bearing edge 104. The bulb 101 has a longitudinal axis L, which extends from the middle of a plane bounded by the bearing edge 104 to the tip 103. The longitudinal axis L at the same time constitutes a symmetry axis for the bulb 101. The bulb 101 delimits and arches over a bulb space 105. The bulb 101 is suitable in particular for a luminous device 100 in the form of an incandescent lamp retrofit lamp, since it is configured with a shape particularly compatible therewith.

(14) FIG. 2 shows that the longitudinal axis L also constitutes a longitudinal axis of the luminous device 100, which extends from a backward end formed by a cap 116 to the tip.

(15) The bulb has six identically constructed optically effective surface structures 106, which are arranged in the bulb 101 on a region of a largest lateral extent, or of a largest diameter, specifically in the circumferential direction, i.e. here rotationally symmetrically by 60°, about the longitudinal axis L.

(16) Each of the surface structures 106 has a through-bore 107 extending at least essentially perpendicularly through the bulb 101. From an outer side 108 of the bulb 101, an optical element 109 is inserted into the through-bore 107 and firmly connected thereto.

(17) Each optical element 109 has a hollow cylindrical base shape, on the outer lateral surface 110 of which two annular elevations 111 with a respective triangular profile extend. A longitudinal hole 112 formed by an inner wall of the optical element 109 is perpendicular to the longitudinal axis L of the bulb 101. In the region of the optical element 109, the bearing edge 104 bulges downward, which permits accurate positioning of the bulb 101 in relation to its rotational position about the longitudinal axis L.

(18) For simple production, the optical elements 109 may, in particular, have been produced separately and subsequently fastened (in particular plugged on or plugged in) on the associated through-bore 107, for example by a press-fit, clamped fit and/or adhesive bond, etc. The optical elements 109 may, as an alternative, be present integrally on the bulb 101. The luminous device 102 may include one or more light-emitting diodes 114 as semiconductor light sources. The luminous device 100, or at least one light-emitting diode 114 thereof, essentially emits laterally in this case. This may in particular mean that a main emission direction is oblique, in particular perpendicular, to the longitudinal axis L. A main emission direction may, in particular, be understood as an emission direction which includes an intensity maximum or brightness maximum of the semiconductor light source. In the case of the luminous device 100, its main emission direction (or the main emission direction of the associated light-emitting diode(s) 114) is directed at the through-bore 107 and the longitudinal hole 112, and extends through the longitudinal hole 112. The longitudinal hole 112 can therefore be used both as a light passage opening and as an air exchange opening.

(19) The light-emitting diode(s) 114 may in this case be mounted with a forward orientation, i.e. they are mounted on a plane which is horizontal in relation to the longitudinal axis L and are oriented with their own longitudinal axis parallel to the longitudinal axis L. The light-emitting diode(s) 114 then in particular have a main emission direction which differs from their longitudinal axis (“light-emitting diode emitting laterally” 114). As an alternative, the light-emitting diode(s) 114 may be mounted with a lateral orientation, i.e. they are mounted in a plane not oriented horizontally in relation to the longitudinal axis L and are oriented with their own longitudinal axis not parallel to the longitudinal axis L. The light-emitting diode(s) 114 then in particular have a main emission direction which does not differ from their own longitudinal axis (“light-emitting diode emitting in the forward direction” 114).

(20) Owing to the fact that the optical elements 109 extend laterally beyond the rest of the bulb 101, light from the optical elements 109 can also be emitted straightforwardly in a direction directed oppositely to the direction of the longitudinal axis L (‘backward’ or ‘into a rear half-space’), so that a particularly large solid angle range can be illuminated. In this case, in particular, a heat sink 115 of the luminous device 100, present below the bearing edge 104, is not or is not substantially an impediment, since the optical elements 109 in particular also extend laterally beyond the heat sink 115. The heat sink may include a plurality of external cooling fins 117, and may also have a driver cavity (not shown) for receiving a driver (not shown).

(21) For further adjustment of the light emission pattern, an inner side 113 of the bulb 101 may at least partially be configured to be specularly or diffusely reflective.

(22) If there are no optical elements 109, the through-bores 107 may be used to an increased extent for the air feed-through. The longitudinal hole 112 may also be obviated.

(23) FIG. 4 shows, in a side view, a three-dimensionally extended bulb 201 according to a second embodiment together with a plurality of light-emitting diodes 202 of a luminous device 200. FIG. 5 shows the elements 201, 202 as a sectional representation in side view. FIG. 6 shows the bulb 201 in a view obliquely from below.

(24) The bulb 201 in this case has a hollow-cylindrically shaped base region 203, the outer lateral surface 204 of which includes laterally projecting annular elevations 205 extending in the circumferential direction (about the longitudinal axis L) as an optically effective surface structure. The elevations 205 are formed in a similar way to Fresnel rings. The elevations 205 have a triangular shape in profile, the elevations 205 not necessarily having either the same sizes or the same triangular shape.

(25) The inner side 206 is widened in profile in the direction of its bearing surface 207, in order to provide space in the bearing surface 207 for a plurality of recesses 208 or indentations for respectively receiving at least one light-emitting diode 202 (here mounted with a forward orientation). The inner side 206 has the shape of a section of a sphere.

(26) The bulb 201 consequently encloses the light-emitting diodes 202 by arching over them by means of the bearing surface 207.

(27) The light-emitting diodes 202 emit essentially fully through the bearing surface 207, or the recesses 208 thereof, into the bulb 201. The light-emitting diodes 202 may to this end, in particular, be mounted with a forward orientation and have a main emission direction parallel to the longitudinal axis L. The bulb 201 also acts, in particular, in this case as a light guide or light-guide element, and emits light outward in an enhanced fashion in the region of the annular elevations 205.

(28) By adjustment of a shape and orientation of the annular elevations 205, the solid angle-related light distribution can be adjusted in a defined way. For coverage, the base region 203 is covered forward (in the direction of the longitudinal axis L) on its front end by a cover region 209.

(29) The cover region 209 has a base shape in the form of a funnel, with a planar bottom 210. From a funnel-shaped projection 211 of the cover region 209, used as a further part of the optically effective surface structure, a further annular projection 212 extends on the outer side in order to permit transition with the base region 203 without discontinuities in the brightness which are perceptible in practice.

(30) The inner side 206 of the bulb 201 may also in this case at least partially, including fully, be configured to be specularly or diffusely reflective.

(31) The bulb 201 readily permits, in particular, problem-free accommodation of a driver or driver unit 214 in the bulb space 213, since the bulb space 213 is not, or is only slightly, significant for light guiding. This permits a particularly compact luminous device 200. Light losses can also be kept particularly low in this way.

(32) FIG. 7 shows a luminous device 300 having a bulb 301 according to a third embodiment in a side view. FIG. 8 shows the bulb 301 as a sectional representation in side view.

(33) The bulb 301 has a hollow-cylindrically shaped base region 303, the outer lateral surface 304 of which includes annular elevations 305 extending in the circumferential direction, similar to Fresnel rings, as an optically effective surface structure. The elevations 305 have a triangular shape in profile, the elevations 305 not necessarily having either the same sizes or the same triangular shape.

(34) In contrast to the bulb 201, the bulb 301 has a cover region 306 in the form of a dish in the shape of a spherical cap, with an unstructured surface. Furthermore, the base region 303 has perpendicularly extending bores 307 which connect the bulb space 308 arched over by the bulb 301 to an environment of the bulb space 308, in order to permit air exchange for cooling of the light-emitting diode 202 (emitting in the forward direction). A light distribution, in particular emission into the front half space, can also straightforwardly be controlled more accurately in this way, for example by means of an, optionally different, diameter of the bore(s).

(35) This bulb 301 essentially does not deviate light emitted forward by the light-emitting diode 202 and not passing through the base region 303, while light striking the base region 303 can be deviated at least partially to an enhanced degree laterally or even backward. If the light-emitting diode 202 is a light-emitting diode emitting in the forward direction, a higher proportion of light will shine through the dish-shaped cover region 306 than in the case of a laterally emitting light-emitting diode.

(36) An inner side 309, formed in the shape of a section of a sphere, of the bulb 301, may here again at least partially be configured to be specularly or diffusely reflective.

(37) The bulb 300 is in this case formed in two parts, the base region 303 and the cover region 306 having been produced separately, and the cover region 306 being fitted into a groove filled with adhesive 310 in an upper edge of the base region.

(38) The light-emitting diodes 202 may, as an alternative, be covered by the bulb 301 in the region of the bores 307, and consequently emit into the bores 307.

(39) FIG. 9 shows a luminous device 400 having a bulb 401 according to a fourth embodiment in a side view. The bulb 401 corresponds at least essentially to the base region 303 of the bulb 301, but does not have a cover region 306. The bulb 401 is thus in this case open on both sides (upper side and lower side). This permits particularly loss-free light emission in a forward direction.

(40) Of course, the disclosure is not restricted to the exemplary embodiments presented.

(41) In particular, features of the various exemplary embodiments may also be interchanged or combined. For example, the spherical cap-shaped cover region 306 may have one or more surface structures 106.

(42) In general, bores for light guiding (in particular fine adjustment of the light emission pattern), air cooling and/or fastening the bulb may be introduced into a bulb. In general, in order to adjust the emission pattern, an inner wall and/or an outer wall of the bulb may be coated, for example with a luminescent material and/or a reflective layer.

(43) While the disclosed embodiments has been particularly shown and described with reference to specific embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the disclosed embodiments as defined by the appended claims. The scope of the disclosed embodiments is thus indicated by the appended claims and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced.

LIST OF REFERENCES

(44) 100 luminous device 101 bulb 102 luminous unit 103 tip 104 bearing edge 105 bulb space 106 surface structure 107 through-bore 108 outer side 109 optical element 110 lateral surface 111 annular elevation 112 longitudinal hole 113 inner side 114 light-emitting diode 115 heat sink 116 cap 117 cooling fin 200 luminous device 201 bulb 202 light-emitting diode 203 base region 204 lateral surface 205 annular elevation 206 inner side 207 bearing surface 208 recess 209 cover region 210 bottom 211 funnel-shaped projection 212 annular projection 213 bulb space 214 driver unit 300 luminous device 301 bulb 303 base region 304 lateral surface 305 annular elevation 306 cover region 307 bore 308 bulb space 309 inner side 310 adhesive 400 luminous device 401 bulb L longitudinal axis