CN108594575B - Micro-projection device - Google Patents
Micro-projection device Download PDFInfo
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- CN108594575B CN108594575B CN201810614708.4A CN201810614708A CN108594575B CN 108594575 B CN108594575 B CN 108594575B CN 201810614708 A CN201810614708 A CN 201810614708A CN 108594575 B CN108594575 B CN 108594575B
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- laser
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- projection
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- 238000003384 imaging method Methods 0.000 claims abstract description 21
- 230000004075 alteration Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
Classifications
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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
- G03B21/208—Homogenising, shaping of the illumination light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
The micro-projection device comprises a laser diode, a diaphragm, a collimating lens, a dichroic prism assembly, a trapezoidal prism, a micro-electromechanical system and an imaging lens, wherein the diaphragm is arranged between the laser diode and the collimating lens, the trapezoidal prism is arranged between the dichroic prism assembly and the micro-electromechanical system, laser emitted by the laser diode sequentially passes through the diaphragm, the collimating lens, the dichroic prism assembly, the trapezoidal prism, the micro-electromechanical system and the imaging lens to obtain a projection picture, the diaphragm is used for removing stray light of the laser, and the trapezoidal prism is used for compressing the laser. By adopting the micro-projection device provided by the embodiment of the invention, stray light can be reduced through the diaphragm, and laser is compressed through the trapezoidal prism to reduce light spots, so that the quality of a projection picture and the laser utilization rate are improved.
Description
Technical Field
The present invention relates to the field of projection technology, and in particular, to a micro-projection apparatus.
Background
With the development of projection technology, MEMS (Micro-Electro-MECHANICAL SYSTEM, micro Electro mechanical system) are widely used in projection technology due to their portability, low power consumption, low cost, and other advantages.
In a projection device (which may be referred to as a micro-projection device) including a MEMS, an LD (Laser Diode), a collimator lens, a dichroic prism assembly, a MEMS, and an imaging lens are generally included. Laser emitted by the LD is processed by the collimating lens and the dichroic prism assembly, and then a projection picture is obtained by the MEMS and the imaging lens.
However, the inventors have found that in implementing the present invention, the prior art has at least the following problems: because the structure of the existing micro-projection device is too simple, the projected picture has the phenomena of larger light spots and more stray light.
Disclosure of Invention
The embodiment of the invention aims to provide a micro-projection device so as to improve the quality of a projection picture and the utilization rate of laser. The specific technical scheme is as follows:
The embodiment of the invention provides a micro-projection device, which comprises a laser diode, a diaphragm, a collimating lens, a dichroic prism assembly, a trapezoid prism, a micro-electromechanical system and an imaging lens;
the diaphragm is positioned between the laser diode and the collimating lens;
the trapezoidal prism is positioned between the dichroic prism assembly and the microelectromechanical system;
The laser emitted by the laser diode sequentially passes through the diaphragm, the collimating lens, the dichroic prism assembly, the trapezoidal prism, the micro-electromechanical system and the imaging lens to obtain a projection picture, wherein the diaphragm is used for removing stray light of the laser, and the trapezoidal prism is used for compressing the laser.
Optionally, the fast axis direction of the laser diode is a horizontal direction, and the slow axis direction is perpendicular to the fast axis direction.
Optionally, a circular through hole is formed in the middle of the diaphragm.
Optionally, the diaphragm is square in shape.
Optionally, the trapezoidal prism is an achromatic lens.
Optionally, the placement angle of the trapezoidal prism is 50 ° to 70 °.
Optionally, the imaging lens includes an adjusting unit, and the adjusting unit is used for adjusting the projection distance and the size of the projection picture.
The micro-projection device comprises a laser diode, a diaphragm, a collimating lens, a dichroic prism assembly, a trapezoidal prism, a micro-electromechanical system and an imaging lens, wherein the diaphragm is arranged between the laser diode and the collimating lens, the trapezoidal prism is arranged between the dichroic prism assembly and the micro-electromechanical system, laser emitted by the laser diode sequentially passes through the diaphragm, the collimating lens, the dichroic prism assembly, the trapezoidal prism, the micro-electromechanical system and the imaging lens to obtain a projection picture, the diaphragm is used for removing stray light of the laser, and the trapezoidal prism is used for compressing the laser.
By adopting the micro-projection device provided by the embodiment of the invention, stray light can be reduced through the diaphragm, and laser is compressed through the trapezoidal prism to reduce light spots, so that the quality of a projection picture and the laser utilization rate are improved. Of course, it is not necessary for any one product or method of practicing the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic structural diagram of a micro-projection device according to an embodiment of the present invention;
FIG. 2 is a right side view of a laser diode in a micro-projection apparatus according to an embodiment of the present invention;
FIG. 3 is a top view of a laser diode in a micro-projection apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic plan view of a diaphragm according to an embodiment of the present invention;
Fig. 5 is a schematic view of a placement angle of a trapezoidal prism according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment of the invention provides a micro-projection device, as shown in fig. 1, which comprises a laser diode 1.1, a diaphragm 1.2, a collimating lens 1.3, a dichroic prism component 1.4, a trapezoid prism 1.5, a micro-electromechanical system 1.6 and an imaging lens 1.7. Wherein the diaphragm 1.2 is arranged between the laser diode 1.1 and the collimating lens 1.3; the trapezoidal prism 1.5 is located between the dichroic prism assembly 1.4 and the microelectromechanical system 1.6; the laser emitted by the laser diode 1.1 sequentially passes through a diaphragm 1.2, a collimating lens 1.3, a dichroic prism component 1.4, a trapezoid prism 1.5, a micro-electromechanical system 1.6 and an imaging lens 1.7 to obtain a projection picture; the diaphragm 1.2 is used for removing stray light of laser, and the trapezoid prism 1.5 is used for compressing the laser.
In an embodiment of the invention, the number of groups of laser diodes 1.1 may be one or more, each group typically comprising three laser diodes, e.g. three laser diodes may be diodes emitting red, green and blue monochromatic light, respectively. The diaphragm 1.2 may be a square baffle with a pupil in the middle, and the diaphragm 1.2 is mainly used for removing or reducing stray light. The collimator lens 1.3 can convert the incident laser light into parallel laser light. The dichroic prism assembly 1.4 is made by gluing a plurality of lenses with different refractive indices. The trapezoidal prism 1.5 is a lens in the shape of a trapezoid, and is mainly used for compressing wider laser light into thinner laser light. The microelectromechanical system 1.6 is a micro-device comprising a microsensor, a micro-actuator and a micromechanical structure equal to one. Imaging lens 1.7 typically comprises an acromatic lens which may reduce chromatic aberration in the projected picture.
The prior art micro-projection device typically only comprises a photodiode 1.1, a collimator lens 1.3, a dichroic prism assembly 1.4, a micro-electro-mechanical system 1.6 and an imaging lens 1.7.
By adopting the micro-projection device provided by the embodiment of the invention, stray light can be reduced by adding the diaphragm 1.2, and the quality of a projection picture can be improved after the stray light is reduced; laser can be compressed to reduce light spots by adding the trapezoid prism 1.5, so that the quality of a projection picture and the laser utilization rate are improved.
Alternatively, as an implementation manner of the embodiment of the present invention, the fast axis direction of the laser diode 1.1 is a horizontal direction, and the slow axis direction is perpendicular to the fast axis direction. The placement direction of the laser diode 1.1 is shown in fig. 2 and 3, the connecting line between the two pins of the laser diode is in the vertical direction, the horizontal direction is the same as the fast axis direction of the laser diode, and the vertical direction is the same as the slow axis direction of the laser diode. Fig. 2 is a right side view of the laser diode, and fig. 3 is a top view of the laser diode.
In the embodiment of the invention, the laser emitted by the laser diode is considered to generally comprise a fast axis direction and a slow axis direction, wherein the fast axis direction refers to a direction with a larger laser divergence angle, and the slow axis direction refers to a direction with a smaller laser divergence angle. In this embodiment, the fast axis direction of the laser diode 1.1 is a horizontal direction, i.e., the fast axis direction of the laser diode 1.1 is placed horizontally, and the slow axis direction of the laser diode 1.1 is placed vertically. The placement direction of the laser diode in this example is opposite to that of the prior art.
In the scheme provided by the embodiment of the invention, the fast axis direction of the laser diode is set as the horizontal direction, and the slow axis direction is perpendicular to the fast axis direction. Therefore, the diffuse light in the projection picture can be reduced, and the design difficulty of the imaging lens is reduced.
Alternatively, as an implementation manner of the embodiment of the invention, a circular through hole is arranged in the middle of the diaphragm 1.2, as shown in fig. 4.
In the embodiment of the invention, the middle part of the diaphragm 1.2 is provided with the circular through hole, laser can reach the collimating lens 1.3 through the circular through hole, and the degree of stray light in the laser can be removed by the diaphragm 1.2 by arranging the diameter of the circular through hole.
Alternatively, as an implementation of the embodiment of the invention, the diaphragm 1.2 has a square shape.
In the embodiment of the invention, the diaphragm 1.2 is square, as shown in fig. 3, so that the diaphragm can be conveniently fixed and assembled.
Alternatively, as one implementation of an embodiment of the invention, the trapezoidal prism 1.5 is an achromat.
In the embodiment of the invention, the trapezoidal prism 1.5 is an achromatic lens, and the achromatic lens is adopted, so that the chromatic aberration of laser can be reduced, and the imaging quality of a projection picture can be improved.
Alternatively, as an implementation manner of the embodiment of the present invention, the placement angle of the trapezoidal prism 1.5 is 50 ° to 70 °, as shown in fig. 5.
In the embodiment of the present invention, when the trapezoidal prism 1.5 is assembled, assuming that the laser is incident to the trapezoidal prism 1.5 in the horizontal direction, the placement angle of the trapezoidal prism (i.e., Φ in fig. 5) is generally set to 50 ° < Φ <70 °, so that the laser can be better compressed, and the compression rate of the laser can be improved. After the laser is compressed, the light utilization rate can be improved, the assembly tolerance of the micro-projection device is improved, and the assembly efficiency can be improved when the micro-projection device is produced.
Optionally, as an implementation manner of the embodiment of the present invention, the imaging lens 1.7 includes an adjusting unit, and the adjusting unit is used for adjusting the projection distance and the size of the projection screen.
In the embodiment of the invention, the imaging lens 1.7 adopts a lens with larger projection ratio, and the imaging lens 1.7 comprises an adjusting unit, and the projection distance, the size of a projection picture and the quality of the projection picture can be adjusted through the adjusting unit.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a device or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such device or apparatus. In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (6)
1. A micro-projection device, characterized in that the micro-projection device comprises a laser diode (1.1), a diaphragm (1.2), a collimating lens (1.3), a dichroic prism assembly (1.4), a trapezoidal prism (1.5), a micro-electro-mechanical system (1.6) and an imaging lens (1.7);
the diaphragm (1.2) is located between the laser diode (1.1) and the collimator lens (1.3);
-the trapezoidal prism (1.5) is located between the dichroic prism assembly (1.4) and the microelectromechanical system (1.6);
After laser emitted by the laser diode (1.1) sequentially passes through the diaphragm (1.2), the collimating lens (1.3), the dichroic prism component (1.4), the trapezoidal prism (1.5), the micro electro mechanical system (1.6) and the imaging lens (1.7), a projection picture is obtained, wherein the diaphragm (1.2) is used for removing stray light of the laser, and the trapezoidal prism (1.5) is used for compressing the laser;
The laser emitted from the dichroic prism assembly (1.4) enters the trapezoid prism (1.5) through first reflection, and the laser emitted from the trapezoid prism (1.5) enters the micro-electromechanical system (1.6) through second reflection, so that the direction of the laser emitted from the dichroic prism assembly (1.4) is the same as the direction of the laser incident to the micro-electromechanical system (1.6);
The trapezoidal prism (1.5) is an achromatic lens.
2. The device according to claim 1, characterized in that the fast axis direction of the laser diode (1.1) is a horizontal direction and the slow axis direction is perpendicular to the fast axis direction.
3. Device according to claim 1, characterized in that the diaphragm (1.2) is provided with a circular through hole in the middle.
4. The device according to claim 1, characterized in that the diaphragm (1.2) is square in shape.
5. The device according to any of claims 1-4, characterized in that the trapezoidal prism (1.5) is placed at an angle of 50 ° to 70 °.
6. The apparatus according to any one of claims 1-4, wherein the imaging lens (1.7) comprises an adjustment unit for adjusting the projection distance and the size of the projection screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810614708.4A CN108594575B (en) | 2018-06-14 | 2018-06-14 | Micro-projection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810614708.4A CN108594575B (en) | 2018-06-14 | 2018-06-14 | Micro-projection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108594575A CN108594575A (en) | 2018-09-28 |
| CN108594575B true CN108594575B (en) | 2024-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810614708.4A Active CN108594575B (en) | 2018-06-14 | 2018-06-14 | Micro-projection device |
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| CN (1) | CN108594575B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546041A (en) * | 2008-03-28 | 2009-09-30 | 鸿富锦精密工业（深圳）有限公司 | Projecting system |
| CN105938977A (en) * | 2016-07-12 | 2016-09-14 | 西安炬光科技股份有限公司 | Method and system for forming linear light spots |
| CN206848675U (en) * | 2017-04-01 | 2018-01-05 | 歌尔股份有限公司 | A kind of laser scanning projection's instrument |
| CN208488642U (en) * | 2018-06-14 | 2019-02-12 | 北京一数科技有限公司 | A kind of micro- projection arrangement |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8891147B2 (en) * | 2011-05-27 | 2014-11-18 | Hitachi-Lg Data Storage, Inc. | Optical beam scanning device and image display device using the same |
| JP2014056199A (en) * | 2012-09-14 | 2014-03-27 | Hitachi Media Electoronics Co Ltd | Scanning type projection device |
| KR102067761B1 (en) * | 2013-03-19 | 2020-01-17 | 삼성전자주식회사 | Optical apparatus including non-electric type touch panel |
| RU2704882C2 (en) * | 2013-11-04 | 2019-10-31 | Долби Лэборетериз Лайсенсинг Корпорейшн | Single- and multi-modulation projection systems with global brightness control |
-
2018
- 2018-06-14 CN CN201810614708.4A patent/CN108594575B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546041A (en) * | 2008-03-28 | 2009-09-30 | 鸿富锦精密工业（深圳）有限公司 | Projecting system |
| CN105938977A (en) * | 2016-07-12 | 2016-09-14 | 西安炬光科技股份有限公司 | Method and system for forming linear light spots |
| CN206848675U (en) * | 2017-04-01 | 2018-01-05 | 歌尔股份有限公司 | A kind of laser scanning projection's instrument |
| CN208488642U (en) * | 2018-06-14 | 2019-02-12 | 北京一数科技有限公司 | A kind of micro- projection arrangement |
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| Publication number | Publication date |
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| CN108594575A (en) | 2018-09-28 |
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