Abstract
There is presented a light fixture (200) comprising an nation device (244) comprising a plurality of light sources (103) emitting light along an optical axis (247); an optical gate (242) arranged along the optical axis; a light collector (241) placed between the plurality of light sources (103) emitting and the optical gate (242) and adapted to collect light from the light sources and adapted to project at least a part of said light along said optical axis (247); and one or more color filters (251, 253), such as color filters for subtractive color mixing, such as dichroic filters or color gels or the like, such as arranged to be traversed by the optical axis (247), placed between the light collector (241) and the optical gate (242), and a converging optical component (263), such as a first converging optical component (263), placed between the one or more color filters (251, 253) and the optical gate (242) and further comprising an optical projecting system (243) placed on the opposite side of the optical gate (242) with respect to the plurality of light sources (103) and adapted to collect at least a part of the light emittable from the illumination device and adapted to project at least a part of said light along said optical axis (247).
Claims
1. A light fixture comprising: an illumination device comprising: a plurality of light sources emitting light along an optical axis; an optical gate arranged along the optical axis; a light collector placed between the plurality of light sources and the optical gate and adapted to collect light from the plurality of light sources and adapted to project at least a part of said light along said optical axis; one or more color filters arranged to be traversed by the optical axis, placed between the light collector and the optical gate; and a first converging optical component placed between the one or more color filters and the optical gate; and an optical projecting system placed on an opposite side of the optical gate with respect to the plurality of light sources and adapted to collect at least a part of the light emittable from the illumination device and adapted to project at least a part of said light along said optical axis.
2. The light fixture according to claim 1, wherein the light collector is arranged so that light from the plurality of light sources is diverging subsequent to passing the light collector.
3. The light fixture according to claim 1, wherein the light collector is arranged so that light from the plurality of light sources is substantially collimated passing the light collector.
4. The light fixture according to claim 1, further comprising a second converging optical component placed between the one or more color filters and the light collector.
5. The light fixture according to claim 1, wherein a distance from the plurality of light sources to the first converging optical component placed between the one or more color filters and the optical gate is 25 cm or less.
6. The light fixture according to claim 1, wherein a diameter of the first converging optical component placed between the one or more color filters and the optical gate is between 1 and 25 cm.
7. The light fixture according to claim 1, wherein the first converging optical component placed between the one or more color fitters and the optical gate comprises an optical material with an Abbe number above 60.
8. The light fixture according to claim 4, wherein the second converging optical component placed between the one or more color filters and the light collector comprises an optical material with an Abbe number above 60.
9. The light fixture according to claim 1, wherein the first converging optical component placed between the one or more color filters and the optical gate comprises one or more aspherical converging lenses.
10. The light fixture according to claim 4, wherein the second converging optical component placed between the one or more color filters and the light collector comprises one or more aspherical converging lenses.
11. The light fixture according to claim 1, wherein the first converging optical component placed between the one or more color filters and the optical gate comprises one or more plano-aspherical converging lenses having a Conic constant above 0.
12. The light fixture according to claim 4, wherein the second converging optical component placed between the one or more color filters (251, and the light collector comprises one or more plano-aspherical lenses having a Conic constant below 0.
13. The light fixture according to claim 1, wherein the illumination device comprises one or more lenses with an anti-reflective (AR) coating.
14. The light fixture according to claim 1, wherein the illumination device provides light to the optical gate having a half angle less than 27 degrees.
15. The light fixture according to claim 1, wherein the illumination device is capable of delivering at least 10 klm.
16. The light fixture according to claim 1, wherein an optical efficiency of the illumination device, is above 40%.
17. The light fixture according to claim 1, wherein the light collector comprises a plurality of lenslets adapted to collect light from the plurality of light sources and adapted to convert the collected light into a plurality of light beams so that the light beams propagate along said optical axis, where each of said lenslets comprises an entrance surface where said light enters the lenslet and an exit surface where the light exits the lenslet.
18. The light fixture according to claim 17, wherein: each lenslet in the plurality of lenslets is a total internal reflection (TIR) lens; or the plurality of lenslets comprises two arrays of plano aspherical lenses on top each other; or the plurality of lenslets in the light collector (241) form a one-piece molded glass element comprising a flange adapted for mechanical fixation of the light collector.
19. (canceled)
20. (canceled)
21. The light fixture according to claim 1, further comprising one or more actuators for changing a direction of light emitted from the light fixture.
22. The light fixture according to claim 1, wherein an illuminance of each light source of the plurality of light sources is above 250 lm/mm.sup.2.
23. (canceled)
24. (canceled)
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0050] The first, second and third aspect according to the invention will now be described in more detail with regard to the accompanying figures. The figures show one way of implementing the present invention and is not to be construed as being limiting to other possible embodiments falling within the scope of the attached claim set.
[0051] FIG. 1 shows a light fixture 200 comprising an illumination device 244.
[0052] FIG. 2 illustrates a structural diagram of a moving head light fixture 302.
[0053] FIG. 3 and FIG. 4 each shows details of a light fixture.
DETAILED DESCRIPTION
[0054] FIG. 1 shows a light fixture 200 comprising an illumination device 244, wherein the illumination device comprises a plurality of LEDs 103, a light collector 241, an optical gate 242 and an optical projecting and zoom system 243. The light collector 241 is adapted to collect light from the LEDs 103 and to convert the collected light into a plurality of light beams propagating along an optical axis 247 (dash-dotted line). The light collector can be embodied as any optical means capable of collecting at least a part of the light emitted by the LEDs and convert the collected light to light beams. In the illustrated embodiment the light collector comprises a number of lenslets each collecting light from one of the LEDs and converting the light into a corresponding collimated light beam (in other embodiments it could be diverging). However it is noticed that the light collector also can be embodied as a single optical lens, a Fresnel lens, a number of TIR lenses (total reflection lenses), a number of light rods, arrays of lenses arranged on top of each other or combinations thereof. It is understood that light beams propagating along the optical axis contain rays of light propagating at an angle, e.g. an angle less that 45 degrees to the optical axis. The figure furthermore shows one or more color filters 251, 253, including color filters 251 for a CMY subtractive color mixing system, arranged to be traversed by the optical axis (247), placed between the light collector (241) and the optical gate (242). In case the one or more color filters 251, 253 comprise a static color filter arranged on a wheel this particular color filter may be positioned between the first converging optical component 263 and the optical gate. Still further the figure shows a (first) converging optical component 263, such as a first converging optical component 263, placed between the one or more color filters 251, 253 and the optical gate 242. Still further, the figure shows a (second) converging optical component 265, such as a second converging optical component 265, placed between the one or more color filters 251, 253 and the light collector 241. The light collector and the converging optical components 263, 265 may be configured to fill the optical the gate 242 with light from the light sources 103 so that the area, i.e. the aperture, of the gate 242 is illuminated with a uniform intensity or optimized for max output. The gate 242 is arranged along the optical axis 247. The optical projecting system 243 may be configured to collect at least a part of the light beams transmitted through the gate 242 and to image the optical gate at a distance along the optical axis. For example, the optical projecting system 243 may be configured to image the gate 242 onto some object such as a screen, e.g. a screen on a concert stage. A certain image, e.g. some opaque pattern provided on a transparent window, an open pattern in a non-transparent material, or imaging object such as GOBOs known in the field of entertainment lighting, may be contained within the gate 242 so that that the illuminated image can be imaged by the optical projecting system. Accordingly, the illumination device 200 may be used for entertainment lighting. In the illustrated embodiment the light is directed along the optical axis 247 by the light collector 241 and passes through a number of light effects before exiting the illumination device through a front lens 243a. The light effects can for instance be any light effects known in the art of intelligent/entertainments lighting for instance, a CMY color mixing system 251, color filters 253, gobos 255, animation effects 257, iris effects 259, a focus lens group 243c, zoom lens group 243b, prism effect 261, framing effects (not shown), or any other light effects known in the art. The mentioned light effects only serves to illustrate the principles of an illuminating device for entertainment lighting and the person skilled in the art of entertainment lighting will be able to construct other variations with additional or less light effects. Further it is noticed that the order and positions of the light effects can be changed. The illumination device comprises a cooling module 201 with first 115 and second 117 blowers. The light fixture comprises a lamp housing 248 provided with a number of openings 250.
[0055] FIG. 2 illustrates a structural diagram of a moving head light fixture 302 comprising a head 200 rotatably connected to a yoke 363 where the yoke is rotatably connected to a base 365. The head is substantially identical to the light fixture shown in FIG. 1 and substantial identical features are labeled with the same reference numbers as in FIG. 1 will not be described further. The moving head light fixture comprises pan rotating means for rotating the yoke in relation to the base, for instance by rotating a pan shaft 367 connected to the yoke and arranged in a bearing (not shown) in the base). A pan motor 369 is connected to the shaft 367 through a pan belt 371 and is configured to rotate the shaft and yoke in relation to the base through the pan belt. The moving head light fixture comprises tilt rotating means for rotating the head in relation to the yoke, for instance by rotating a tilt shaft 373 connected to the head and arranged in a bearing (not shown) in the yoke). A tilt motor 375 is connected to the tilt shaft 373 through a tilt belt 377 and is configured to rotate the shaft and head in relation to the yoke through the tilt belt. The skilled person will realize that the pan and tilt rotation means can be constructed in many different ways using mechanical components such as motors, shafts, gears, cables, chains, transmission systems, bearings etc. Alternatively it is noticed that it also is possible to arrange the pan motor in the base and/or arrange the tilt motor in the head. The space between the yoke and the bottom part of the head is limited as the moving head light fixture is designed to be as small as possible. As known in the prior art the moving head light fixture receives electrical power 381 from an external power supply (not shown). The electrical power is received by an internal power supply 383 which adapts and distributes electrical power through internal power lines (not shown) to the subsystems of the moving head. The internal power system can be constructed in many different ways for instance by connecting all subsystems to the same power line. The skilled person will however realize that some of the subsystems in the moving head need different kind of power and that a ground line also can be used. The light source will for instance in most applications need a different kind of power than step motors and driver circuits. The light fixture comprises also a controller 385 which controls the components (other subsystems) in the light fixture based on an input signal 387 indicative light effect parameters, position parameters and other parameters related to the moving head lighting fixture. The controller receives the input signal from a light controller (not shown) as known in the art of intelligent and entertainment lighting for instance by using a standard protocol like DMX, ArtNET, RDM etc. Typically the light effect parameter is indicative of at least one light effect parameter related to the different light effects in the light system. The controller 385 is adapted to send commands and instructions to the different subsystems of the moving head through internal communication lines (not shown). The internal communication system can be based on a various type of communications networks/systems. The moving head can also comprise user input means enabling a user to interact directly with the moving head instead of using a light controller to communicate with the moving head. The user input means 389 can for instance be bottoms, joysticks, touch pads, keyboard, mouse etc. The user input means can also be supported by a display 391 enabling the user to interact with the moving head through a menu system shown on the display using the user input means. The display device and user input means can in one embodiment also be integrated as a touch screen.
[0056] Each of FIG. 3 and FIG. 4 shows details of a light fixture, and more particularly a plurality of light sources 103 (in the form of 120×10 W LEDs) emitting light along an optical axis, an optical gate 242 arranged along the optical axis, a light collector 241 placed between the plurality of light sources 103) and the optical gate 242 and adapted to collect light from the light sources and adapted to project at least a part of said light along said optical axis 247, a (first) converging optical component 263, such as a first converging optical component 263, placed between the one or more color filters (not shown) and the optical gate 242, a (second) converging optical component 265, such as a second converging optical component 265, placed between the one or more color filters (not shown) and the light collector 241. A distance between the converging optical components 263, 265 is 32 mm, but is in general dictated by mechanical needs.
[0057] FIG. 3 more particularly shows a light collector (103) in the form of an Ø72.8 mm (diameter) array of 120×Ø6 mm (diameter) collimating Poly(methyl methacrylate) TIR lenses, one for each LED. The converging optical components 263, 265 are each a Ø80 mm (diameter) converging borosilicate glass lens, such as of type Pyrex or Supprax. Glass types B270 and H-K9L are also suitable glass candidates. A distance from the light sources to the optical gate is 130 mm. The beam characteristics at the optical gate is: Beam diameter Ø32 mm, beam (half) angle θ.sub.1/2=22°. Optical source to gate efficiency is 50% (with AR coating on the converging optical components 263, 265) or 40% (without AR coating on the converging optical components 263, 265).
[0058] FIG. 4 more particularly shows a light collector (103) in the form of an Ø90.4 mm (diameter) array of 120×Ø7.45 mm (diameter) collimating Poly(methyl methacrylate), such as HT-121 TIR lenses, one for each LED. The converging optical components 263, 265 are each a Ø100 mm (diameter) converging borosilicate glass lens, such as of type H-K9L. A distance from the light sources to the optical gate is 150 mm. A distance from the (first) converging optical component 263, such as the first converging optical component 263, placed between the one or more color filters (not shown) and the optical gate 242 to the optical gate is approximately 79 mm. Preferably, the converging optical components 263, 265 each comprises a plano-aspheric converging lens having an Abbe number being larger that 70. The beam characteristics at the optical gate is: Beam diameter Ø32 mm, beam (half) angle θ.sup.1/2=22°. Optical source to gate efficiency is 52% (without AR coating on the converging optical components 263, 265) or 59% (with AR coating on the converging optical components 263, 265).
[0059] Although the present invention has been described in connection with the specified embodiments, it should not be construed as being in any way limited to the presented examples. The scope of the present invention is set out by the accompanying claim set. In the context of the claims, the terms “comprising” or “comprises” do not exclude other possible elements or steps. Also, the mentioning of references such as “a” or “an” etc. should not be construed as excluding a plurality. The use of reference signs in the claims with respect to elements indicated in the figures shall also not be construed as limiting the scope of the invention. Furthermore, individual features mentioned in different claims, may possibly be advantageously combined, and the mentioning of these features in different claims does not exclude that a combination of features is not possible and advantageous.
