CN113608402A - Lighting device and micro projector - Google Patents
Lighting device and micro projector Download PDFInfo
- Publication number
- CN113608402A CN113608402A CN202110920577.4A CN202110920577A CN113608402A CN 113608402 A CN113608402 A CN 113608402A CN 202110920577 A CN202110920577 A CN 202110920577A CN 113608402 A CN113608402 A CN 113608402A
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- Prior art keywords
- light source
- light
- light beam
- dichroic mirror
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- 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
- G03B21/2033—LED or laser light sources
-
- 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
- G03B21/2053—Intensity control of illuminating 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
- G03B21/2066—Reflectors in illumination beam
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
Abstract
The invention discloses a lighting device, which comprises a light source component, a dichroic mirror group and a light homogenizing element, wherein the dichroic mirror group is arranged on the light source component; the light source assembly at least comprises a first light source, a second light source, a third light source and a fourth light source, wherein the first light source is surrounded around the dichroic mirror group and emits a first wavelength projection light beam, the second light source emits a second wavelength projection light beam, the third light source emits a third wavelength projection light beam, and the fourth light source emits a fourth wavelength excitation light beam; the dichroic mirror group is formed by crossing a first dichroic mirror and a second dichroic mirror; the dodging element is arranged behind the light beam emergent surface of the dichroic mirror group, and the optical axis is vertical to the optical axis of the combined projection light beam; the invention improves the brightness of green light and ensures the light efficiency utilization rate of other colored lights, thereby improving the overall brightness of the micro projector.
Description
Technical Field
The invention relates to the technical field of projection display, in particular to a lighting device and a micro projector.
Background
With the development and maturation of projection technology, micro-projectors have become popular personal and household consumer products. In the micro projector in the market, projection light is mainly generated by solid light sources (such as Light Emitting Diodes (LEDs) or laser diodes) with three colors of red, green and blue, and the light passes through a light combining device and a light uniformizing device to irradiate a light modulator (such as a Digital Micromirror Device (DMD), a Liquid Crystal Display (LCD) or a reflective liquid crystal LcoS), and finally, a picture is projected to a screen by a projection lens for amplification. The display effect of the micro projector in the environment is mainly influenced by the projection brightness. The projection brightness of the micro projector mainly depends on the light-emitting brightness of the light source and the light utilization efficiency of the follow-up device, the light-emitting brightness of the solid light source is generally in positive correlation with the light-emitting area, and the larger the light-emitting chip is, the larger the volume of the lighting device is, the larger the lighting device is, the size of the lighting device is inevitably increased, and the special requirements of micro projection are not met. In addition, due to the matching requirement of white balance, the light quantity of green light needs to reach about 7, and how to improve the brightness of the green light as much as possible without increasing the volume of the lighting device is a key technical problem in the micro projection industry.
In the prior art, a mode of exciting fluorescent powder by blue light is commonly used to solve the problems of insufficient brightness of green light or low luminous efficiency. The patent with application number CN201920487802.8 discloses a novel illumination light path (as in figure 1), utilizes dichroic mirror and speculum with the blue light wave band and the green light wave band separation in the green light source and this blue light wave band of reuse arouses phosphor powder, and this scheme has only utilized a little blue light wave band in the former green light source, and is not obvious to green glow luminance promotion effect, and has increased the speculum and has increased the illumination volume. Patent application No. CN201310376466.7 discloses a light source device of a projector (as shown in fig. 2), which utilizes a laser diode to excite a fluorescent wheel to generate green light, and combines the three colors of red, green and blue projected light through two dichroic mirrors. Patent with application number CN201710349749.0 discloses a projection illumination light path and a projection device thereof (as shown in fig. 3), which utilizes a blue laser light source to excite fluorescent powder coated on a green LED light source to enhance the brightness of the green light source, and performs light path splitting and light combining through two dichroic mirrors and a splitting prism, and the excessive light combining elements in the scheme have the disadvantages of large volume and low light utilization rate.
The lighting system of current micro projector mostly combines light through simply putting the projection light of dichroic mirror to three kinds of light sources of red green blue, and this mode also causes the too big characteristic requirement that can't satisfy micro projector's compact structure of volume, has certain projection beam light path overlength simultaneously, can't guarantee the collimation degree requirement of light beam, has deteriorated subsequent even light and the size of light collecting device, and then can't really effectively promote green glow luminance and holistic light utilization ratio.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the lighting device and the micro projector.
In order to achieve the purpose, the invention adopts the technical scheme that: an illumination device comprises a light source component, a dichroic mirror group and a light homogenizing element; the light source assembly at least comprises a first light source, a second light source, a third light source and a fourth light source, wherein the first light source is surrounded around the dichroic mirror group and emits a first wavelength projection light beam, the second light source is emitted a second wavelength projection light beam, the third light source is emitted a third wavelength projection light beam, the fourth light source is emitted a fourth wavelength excitation light beam, an emergent light beam optical axis of the first light source is intersected with an emergent light beam optical axis of the second light source, an emergent light beam optical axis of the third light source and an emergent light beam optical axis of the fourth light source at 90 degrees, an emergent light beam optical axis of the second light source is intersected with an emergent light beam optical axis of the third light source and an emergent light beam optical axis of the fourth light source at 90 degrees, an emergent light beam optical axis of the third light source is collinear with an emergent light beam optical axis of the fourth light source, a wavelength conversion material on the surface of the third light source is converted into a third wavelength projection light beam Shadow beam; the dichroic mirror group is composed of a first dichroic mirror and a second dichroic mirror in a crossed manner, a normal line of the first dichroic mirror is perpendicular to a normal line of the second dichroic mirror, a normal line of the second dichroic mirror is coplanar with a plane where the first dichroic mirror is located, a normal line of the first dichroic mirror is coplanar with a plane where the second dichroic mirror is located, and the dichroic mirror group is used for guiding a fourth wavelength light beam emitted by the fourth light source to a wavelength conversion material on the surface of the third light source and combining projection light beams with at least three wavelengths provided by the light source assembly to the same light path; the light homogenizing element is arranged behind the light beam emergent surface of the dichroic mirror group, and the optical axis of the light homogenizing element is perpendicular to the optical axis of the combined projection light beam.
As a further improvement of the present invention, the wavelength conversion material is a fluorescent material or a quantum material.
As a further improvement of the present invention, a first collimating lens group is disposed between the first light source and the dichroic mirror group, a second collimating lens group is disposed between the second light source and the dichroic mirror group, a third collimating lens group is disposed between the third light source and the dichroic mirror group, and a fourth collimating lens group is disposed between the fourth light source and the dichroic mirror group.
As a further improvement of the present invention, the first light source, the second light source, the third light source, and the fourth light source are solid-state light sources, and the solid-state light sources are light emitting diodes or laser diodes.
As a further improvement of the invention, the first wavelength projection light beam, the second wavelength projection light beam and the third wavelength light beam are projected as red light, blue light and green light respectively, and the wavelengths are 410nm-470nm, 490nm-540nm and 600nm-650 nm.
As a further improvement of the invention, the fourth wavelength light beam is blue light or blue-violet light, and the wavelength is 410nm-470 nm.
As a further improvement of the present invention, the first dichroic mirror is plated with a light splitting film for transmitting the fourth wavelength excitation light beam, the first wavelength projection light beam and the second wavelength projection light beam and reflecting the third wavelength projection light beam, or reflecting the fourth wavelength excitation light beam and the first wavelength projection light beam and transmitting the third wavelength projection light beam and the second wavelength projection light beam; the second dichroic mirror is plated with a light splitting film and is used for transmitting the first wavelength projection light beam, the third wavelength projection light beam and the fourth wavelength excitation light beam and reflecting the second wavelength projection light beam.
As a further improvement of the present invention, the light uniformizing element is a fly eye lens array.
The invention also provides a micro projector which comprises the lighting device.
The invention has the beneficial effects that:
the invention uses two dichroic mirrors crossed in a special way, improves the green light brightness and reduces the collimation difficulty of light beams emitted by a light source on the premise of ensuring compact structure, thereby effectively and greatly improving the output brightness of the micro projector.
Drawings
FIG. 1 is a front view of a set of dichroic mirrors in an embodiment of the present invention;
FIG. 2 is a left side view of a set of dichroic mirrors in an embodiment of the present invention;
FIG. 3 is a top view of a set of dichroic mirrors in an embodiment of the present invention;
FIG. 4 is a schematic structural view of example 1 of the present invention;
fig. 5 is a schematic structural diagram of embodiment 2 of the present invention.
11. First light source, 12, second light source, 13, third light source, 14, fourth light source, 21, first collimating lens group, 22, second collimating lens group, 23, third collimating lens group, 24, fourth collimating lens group, 31, first dichroic mirror, 32, second dichroic mirror, 41, fly-eye lens array.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, 2, 3 and 4, in an illumination apparatus, a first light source 11 emits a red projection light beam R, which is collimated by a first collimating lens group 21, and then emitted after passing through a first dichroic mirror 31 and a second dichroic mirror 32; second light source 12 emits blue projection light beam B1, which is collimated by second collimating lens group 22, reflected by second dichroic mirror 32 with its propagation direction changed by 90 °, and exits after passing through first dichroic mirror 31; third light source 13 emits green projection light beam G, which is collimated by third collimating lens group 23, reflected by first dichroic mirror 31, changes its propagation direction by 90 °, and exits after passing through first dichroic mirror 32; the fourth light source 14 emits a blue excitation light beam B2, which is collimated by the fourth collimating lens group 24, passes through the first dichroic mirror 31 and the second dichroic mirror 32, and then irradiates on the wavelength conversion material on the surface of the third light source 13, the wavelength conversion material is excited to emit a green projection light beam B1, the excited and emitted green projection light beam B1 is the same as the green projection light beam B1 emitted by the third light source 13, and is collimated by the third collimating lens group 23, and then reflected by the first dichroic mirror 31, the propagation direction of which is changed by 90 degrees, and the reflected light beam passes through the first dichroic mirror 32 and then is emitted; to this end, the three projection light beams are combined into the same optical path, and are incident into the fly-eye lens array 41 at a small divergence angle for light uniformization, and then enter a subsequent device to form high-brightness and high-uniformity color illumination.
Example 2
As shown in fig. 1, 2, 3 and 5, in an illumination device, a first light source 11 emits a red projection light beam R, which is collimated by a first collimating lens group 21, reflected by a first dichroic mirror 31, changes its propagation direction by 90 °, and exits after passing through a second dichroic mirror 32; second light source 12 emits blue projection light beam B1, which is collimated by second collimating lens group 22, reflected by second dichroic mirror 32 with its propagation direction changed by 90 °, and exits after passing through first dichroic mirror 31; third light source 13 emits green projection light beam G, which is collimated by third collimating lens group 23, and then exits after passing through first dichroic mirror 31 and second dichroic mirror 32; the fourth light source 14 emits a blue excitation light beam B2, which is collimated by the fourth collimating lens group 24, collimated by the third collimating lens group 23, reflected by the first dichroic mirror 31, the propagation direction of which is changed by 90 °, and transmitted through the first dichroic mirror 32, and then irradiated on the wavelength conversion material on the surface of the third light source 13, the wavelength conversion material is excited to emit a green projection light beam B1, and the excited and emitted green projection light beam B1 is the same as the green projection light beam B1 emitted by the third light source 13, and is emitted after being transmitted through the first dichroic mirror 31 and the second dichroic mirror 32; to this end, the three projection light beams are combined into the same optical path, and are incident into the fly-eye lens array 41 at a small divergence angle for light uniformization, and then enter a subsequent device to form high-brightness and high-uniformity color illumination.
Example 3
A pico projector comprising the illumination device according to embodiment 1 or embodiment 2.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. An illumination device is characterized by comprising a light source component, a dichroic mirror group and a light homogenizing element; the light source assembly at least comprises a first light source, a second light source, a third light source and a fourth light source, wherein the first light source is surrounded around the dichroic mirror group and emits a first wavelength projection light beam, the second light source is emitted a second wavelength projection light beam, the third light source is emitted a third wavelength projection light beam, the fourth light source is emitted a fourth wavelength excitation light beam, an emergent light beam optical axis of the first light source is intersected with an emergent light beam optical axis of the second light source, an emergent light beam optical axis of the third light source and an emergent light beam optical axis of the fourth light source at 90 degrees, an emergent light beam optical axis of the second light source is intersected with an emergent light beam optical axis of the third light source and an emergent light beam optical axis of the fourth light source at 90 degrees, an emergent light beam optical axis of the third light source is collinear with an emergent light beam optical axis of the fourth light source, a wavelength conversion material on the surface of the third light source is converted into a third wavelength projection light beam Shadow beam; the dichroic mirror group is composed of a first dichroic mirror and a second dichroic mirror in a crossed manner, a normal line of the first dichroic mirror is perpendicular to a normal line of the second dichroic mirror, a normal line of the second dichroic mirror is coplanar with a plane where the first dichroic mirror is located, a normal line of the first dichroic mirror is coplanar with a plane where the second dichroic mirror is located, and the dichroic mirror group is used for guiding a fourth wavelength light beam emitted by the fourth light source to a wavelength conversion material on the surface of the third light source and combining projection light beams with at least three wavelengths provided by the light source assembly to the same light path; the light homogenizing element is arranged behind the light beam emergent surface of the dichroic mirror group, and the optical axis of the light homogenizing element is perpendicular to the optical axis of the combined projection light beam.
2. A lighting device as recited in claim 1, wherein said wavelength conversion material is a fluorescent material or a quantum material.
3. A lighting device as recited in claim 1, wherein a first collimating lens group is disposed between said first light source and said set of dichroic lenses, a second collimating lens group is disposed between said second light source and said set of dichroic lenses, a third collimating lens group is disposed between said third light source and said set of dichroic lenses, and a fourth collimating lens group is disposed between said fourth light source and said set of dichroic lenses.
4. A lighting device as recited in claim 1, wherein said first, second, third and fourth light sources are solid state light sources, and said solid state light sources are light emitting diodes or laser diodes.
5. The illumination device of claim 1, wherein the first, second, and third wavelength projection beams project red, blue, and green light, respectively, at wavelengths of 410nm-470nm, 490nm-540nm, and 600nm-650 nm.
6. A lighting device as recited in claim 5, wherein said fourth wavelength light beam is blue or violet light having a wavelength of from 410nm to 470 nm.
7. The illumination device according to claim 1, wherein the first dichroic mirror is coated with a dichroic film for transmitting the fourth wavelength excitation light beam, the first wavelength projection light beam and the second wavelength projection light beam and reflecting the third wavelength projection light beam, or reflecting the fourth wavelength excitation light beam and the first wavelength projection light beam and transmitting the third wavelength projection light beam and the second wavelength projection light beam; the second dichroic mirror is plated with a light splitting film and is used for transmitting the first wavelength projection light beam, the third wavelength projection light beam and the fourth wavelength excitation light beam and reflecting the second wavelength projection light beam.
8. The illumination device of claim 1, wherein the light homogenizing element is a fly-eye lens array.
9. A pico projector comprising an illumination device according to any of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110920577.4A CN113608402A (en) | 2021-08-11 | 2021-08-11 | Lighting device and micro projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110920577.4A CN113608402A (en) | 2021-08-11 | 2021-08-11 | Lighting device and micro projector |
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| Publication Number | Publication Date |
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| CN113608402A true CN113608402A (en) | 2021-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110920577.4A Pending CN113608402A (en) | 2021-08-11 | 2021-08-11 | Lighting device and micro projector |
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| Country | Link |
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| CN (1) | CN113608402A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675411A (en) * | 2022-02-22 | 2022-06-28 | 徕卡显微系统科技(苏州)有限公司 | Filter element, light source module, multi-channel fluorescence lighting system and fluorescence microscope |
| WO2024138696A1 (en) * | 2022-12-30 | 2024-07-04 | 成都九天画芯科技有限公司 | Optical module and projection apparatus using same |
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| KR20060096723A (en) * | 2005-03-02 | 2006-09-13 | 엘지전자 주식회사 | Prism with light emitting diode |
| CN106950788A (en) * | 2017-05-17 | 2017-07-14 | 广景视睿科技（深圳）有限公司 | A kind of projection lighting optical path and its projection arrangement |
| CN109839796A (en) * | 2019-04-11 | 2019-06-04 | 杭州浩渺光电有限公司 | Micro projector illumination path |
| CN209182644U (en) * | 2018-12-19 | 2019-07-30 | 广景视睿科技（深圳）有限公司 | A kind of red illumination light source and projection lighting light source |
| CN111812934A (en) * | 2020-08-31 | 2020-10-23 | 南阳南方智能光电有限公司 | Single right-angle prism LED micro projection lighting system |
| CN213517861U (en) * | 2020-11-20 | 2021-06-22 | 四川长虹电器股份有限公司 | Illumination optical system and miniature projector |
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2021
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1779504A (en) * | 2004-11-27 | 2006-05-31 | 三星电子株式会社 | Illumination unit and projection type image display apparatus employing the same |
| KR20060096723A (en) * | 2005-03-02 | 2006-09-13 | 엘지전자 주식회사 | Prism with light emitting diode |
| CN106950788A (en) * | 2017-05-17 | 2017-07-14 | 广景视睿科技（深圳）有限公司 | A kind of projection lighting optical path and its projection arrangement |
| CN209182644U (en) * | 2018-12-19 | 2019-07-30 | 广景视睿科技（深圳）有限公司 | A kind of red illumination light source and projection lighting light source |
| CN109839796A (en) * | 2019-04-11 | 2019-06-04 | 杭州浩渺光电有限公司 | Micro projector illumination path |
| CN111812934A (en) * | 2020-08-31 | 2020-10-23 | 南阳南方智能光电有限公司 | Single right-angle prism LED micro projection lighting system |
| CN213517861U (en) * | 2020-11-20 | 2021-06-22 | 四川长虹电器股份有限公司 | Illumination optical system and miniature projector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114675411A (en) * | 2022-02-22 | 2022-06-28 | 徕卡显微系统科技(苏州)有限公司 | Filter element, light source module, multi-channel fluorescence lighting system and fluorescence microscope |
| WO2024138696A1 (en) * | 2022-12-30 | 2024-07-04 | 成都九天画芯科技有限公司 | Optical module and projection apparatus using same |
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