US20020067612A1 - Illuminating apparatus using multiple light sources - Google Patents
Illuminating apparatus using multiple light sources Download PDFInfo
- Publication number
- US20020067612A1 US20020067612A1 US09/789,228 US78922801A US2002067612A1 US 20020067612 A1 US20020067612 A1 US 20020067612A1 US 78922801 A US78922801 A US 78922801A US 2002067612 A1 US2002067612 A1 US 2002067612A1
- Authority
- US
- United States
- Prior art keywords
- light
- parabolic reflector
- reflecting surface
- light rays
- integrator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007363 ring formation reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
Definitions
- the invention relates to an illuminating apparatus for a projection display, more particularly to an illuminating apparatus that utilizes a plurality of light sources to generate input light for a projection display.
- a conventional projection display input light is filtered and separated into color components that are modulated and subsequently recombined to generate an image output.
- a single light source is commonly used to generate the input light in the conventional projection display.
- the single light source will incur a corresponding increase in power requirement.
- High-power single light sources are disadvantageous in that there is a severe heat dissipation problem that is difficult to resolve when such light sources are in use.
- the object of the present invention is to provide an illuminating apparatus that utilizes a plurality of light sources to generate input light for a projection display.
- an illuminating apparatus comprises:
- a parabolic reflector disposed in front of the light members for receiving the forwardly directed parallel light rays from the light members, the parabolic reflector having a reflecting surface that confronts the light members;
- an integrator unit having an input side to receive the light rays reflected by the reflecting surface of the parabolic reflector.
- FIG. 1 is a schematic view of the first preferred embodiment of an illuminating apparatus according to this invention.
- FIG. 2 is a schematic view of the second preferred embodiment of an illuminating apparatus according to this invention.
- the first preferred embodiment of an illuminating apparatus 1 is shown to comprise a plurality of light members 32 , a parabolic reflector 3 , and an integrator unit.
- the light members 2 are spaced apart from each other and are disposed on a common place.
- Each of the light members 2 includes a light source 22 and a parabolic reflector 21 .
- the parabolic reflector 21 has a connecting end 212 for connecting the light source 22 , and an open end 213 opposite to the connecting end 212 .
- the light parabolic reflector 21 further has a reflecting surface 211 for reflecting light rays that radiate from the light source 22 to produce forwardly directed parallel light rays.
- the number of the light members 2 depends on the requirement of brightness in a projection display.
- the light members 2 can be arranged in a ring formation.
- the parabolic reflector 3 is disposed in front of the light members 2 for receiving the forwardly directed parallel light rays from the light members 2 .
- the parabolic reflector 3 has a reflecting surface 31 that confronts the light members 2 , and a focal point 32 .
- the integrator unit includes a rod integrator 4 that has an input side 41 to receive the light rays reflected by the reflecting surface 31 of the parabolic reflector 3 .
- the input side 41 of the rod integrator 4 is coincident with the focal point 32 such that the light rays reflected by the reflecting surface 31 converge at the input side 41 .
- input light for a projection display (not shown) can be obtained from an output side 42 of the rod integrator 4 .
- FIG. 2 illustrates the second preferred embodiment of an illuminating apparatus 5 according to this invention, which is a modification of the first preferred embodiment.
- the integrator unit includes a lens array integrator 53 , and a lens 54 .
- the lens array integrator 53 has an incident end 531 that confronts the reflecting surface 520 of the parabolic reflector 52 , and a radiating end 532 .
- the lens 54 is disposed between the parabolic reflector 52 and the lens array integrator 53 .
- the lens 54 has a second focal point 541 that is coincident with the first focal point 521 of the parabolic reflector 52 such that the light rays reflected by the reflecting surface 520 converge at the first and second focal points 521 , 541 and pass through the lens 54 and such that the light rays are radiated in parallel toward the incident end 531 of the lens array integrator 53 .
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
- 1. Field of the Invention
- The invention relates to an illuminating apparatus for a projection display, more particularly to an illuminating apparatus that utilizes a plurality of light sources to generate input light for a projection display.
- 2. Description of the Related Art
- In a conventional projection display, input light is filtered and separated into color components that are modulated and subsequently recombined to generate an image output. A single light source is commonly used to generate the input light in the conventional projection display. For projection displays with a high requirement of brightness, the single light source will incur a corresponding increase in power requirement. High-power single light sources are disadvantageous in that there is a severe heat dissipation problem that is difficult to resolve when such light sources are in use.
- Therefore, the object of the present invention is to provide an illuminating apparatus that utilizes a plurality of light sources to generate input light for a projection display.
- According to the present invention, an illuminating apparatus comprises:
- a plurality of light members spaced apart from each other and operable so as to produce forwardly directed parallel light rays;
- a parabolic reflector disposed in front of the light members for receiving the forwardly directed parallel light rays from the light members, the parabolic reflector having a reflecting surface that confronts the light members; and
- an integrator unit having an input side to receive the light rays reflected by the reflecting surface of the parabolic reflector.
- Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which:
- FIG. 1 is a schematic view of the first preferred embodiment of an illuminating apparatus according to this invention; and
- FIG. 2 is a schematic view of the second preferred embodiment of an illuminating apparatus according to this invention.
- Referring to FIG. 1, the first preferred embodiment of an
illuminating apparatus 1 according to the present invention is shown to comprise a plurality oflight members 32, aparabolic reflector 3, and an integrator unit. - The
light members 2 are spaced apart from each other and are disposed on a common place. Each of thelight members 2 includes alight source 22 and aparabolic reflector 21. Theparabolic reflector 21 has a connectingend 212 for connecting thelight source 22, and anopen end 213 opposite to the connectingend 212. The lightparabolic reflector 21 further has a reflectingsurface 211 for reflecting light rays that radiate from thelight source 22 to produce forwardly directed parallel light rays. In design, the number of thelight members 2 depends on the requirement of brightness in a projection display. Thelight members 2 can be arranged in a ring formation. - The
parabolic reflector 3 is disposed in front of thelight members 2 for receiving the forwardly directed parallel light rays from thelight members 2. Theparabolic reflector 3 has a reflectingsurface 31 that confronts thelight members 2, and afocal point 32. - The integrator unit includes a
rod integrator 4 that has aninput side 41 to receive the light rays reflected by the reflectingsurface 31 of theparabolic reflector 3. Theinput side 41 of therod integrator 4 is coincident with thefocal point 32 such that the light rays reflected by the reflectingsurface 31 converge at theinput side 41. As such, input light for a projection display (not shown) can be obtained from anoutput side 42 of therod integrator 4. - Because the high power is distributed among the
light members 2, the heat dissipation problem commonly encountered with the use of a high-power single light source as taught in the prior art can be easily overcome. In addition, when one of thelight members 2 breaks down, the illuminating apparatus can still work as long as theremaining light members 2 are operable. - FIG. 2 illustrates the second preferred embodiment of an
illuminating apparatus 5 according to this invention, which is a modification of the first preferred embodiment. Unlike the previous embodiment, the integrator unit includes alens array integrator 53, and alens 54. Thelens array integrator 53 has anincident end 531 that confronts the reflectingsurface 520 of theparabolic reflector 52, and aradiating end 532. Thelens 54 is disposed between theparabolic reflector 52 and thelens array integrator 53. Thelens 54 has a secondfocal point 541 that is coincident with the firstfocal point 521 of theparabolic reflector 52 such that the light rays reflected by thereflecting surface 520 converge at the first and secondfocal points lens 54 and such that the light rays are radiated in parallel toward theincident end 531 of thelens array integrator 53. - Like the previous embodiment, because the high power is distributed among the
light members 51, the heat dissipation problem commonly encountered with the use of a high-power single light source as taught in the prior art can be easily overcome. - While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW89126015 | 2000-12-06 | ||
TW089126015 | 2000-12-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020067612A1 true US20020067612A1 (en) | 2002-06-06 |
US6431739B1 US6431739B1 (en) | 2002-08-13 |
Family
ID=21662215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/789,228 Expired - Fee Related US6431739B1 (en) | 2000-12-06 | 2001-02-20 | Illuminating apparatus using multiple light sources |
Country Status (1)
Country | Link |
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US (1) | US6431739B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6877882B1 (en) | 2003-03-12 | 2005-04-12 | Delta Electronics, Inc. | Illumination system for a projection system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5526237A (en) * | 1993-12-10 | 1996-06-11 | General Electric Company | Lighting system for increasing brightness to a light guide |
JP3058251B2 (en) * | 1996-04-17 | 2000-07-04 | オリンパス光学工業株式会社 | Illumination optics |
US6179439B1 (en) * | 1998-06-10 | 2001-01-30 | Optical Gaging Products, Inc. | High-incidence programmable surface illuminator for video inspection systems |
-
2001
- 2001-02-20 US US09/789,228 patent/US6431739B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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US6431739B1 (en) | 2002-08-13 |
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Owner name: PROKIA TECHNOLOGY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHUANG, FU-MING;REEL/FRAME:011611/0257 Effective date: 20010208 |
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Owner name: PROKIA TECHNOLOGY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KENMOS TECHNOLOGY CO., LTD.;REEL/FRAME:014357/0193 Effective date: 20040129 |
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Owner name: DIGIMEDIA TECHNOLOGY, CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PROKIA TECHNOLOGY CO., LTD.;REEL/FRAME:017546/0804 Effective date: 20060123 |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20100813 |