CN101393382A - Projection display and light source module thereof - Google Patents

Projection display and light source module thereof Download PDF

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Publication number
CN101393382A
CN101393382A CNA2007101528306A CN200710152830A CN101393382A CN 101393382 A CN101393382 A CN 101393382A CN A2007101528306 A CNA2007101528306 A CN A2007101528306A CN 200710152830 A CN200710152830 A CN 200710152830A CN 101393382 A CN101393382 A CN 101393382A
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CN
China
Prior art keywords
reflection type
laser beam
laser
type unit
projection display
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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.)
Pending
Application number
CNA2007101528306A
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Chinese (zh)
Inventor
陈秋萍
王思克
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Coretronic Corp
CTX Opto Electronics Corp
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Coretronic Corp
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Publication date
Application filed by Coretronic Corp filed Critical Coretronic Corp
Priority to CNA2007101528306A priority Critical patent/CN101393382A/en
Publication of CN101393382A publication Critical patent/CN101393382A/en
Pending legal-status Critical Current

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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
    • G03B21/2066—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
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural 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
    • G03B21/2006—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)
  • Projection Apparatus (AREA)

Abstract

The present invention discloses a projection display device, which comprises a laser array provided with a plurality of laser units, a reflection type unit on which a plurality of reflection planes are formed, and a diffusing element. Each laser unit emits laser beams, and the reflection type unit is used for receiving and converging the laser beams. The diffusing element is arranged on the transmission paths of the laser beams for diffusing the converged laser beams so as to form illuminating beams. The projection display device comprises a uniform light element, a lens set, a light valve and a projection lens which are sequentially arranged on the transmission paths of the illuminating beams. The uniform light element is used for uniformizing the diffused illuminating beams. The lens set is used for adjusting the sectional areas of the illuminating beams. The light valve is used for converting the illuminating beams into image beams. The projector lens is used for projecting the image beams to a screen to form an image.

Description

Projection display equipment and light source module thereof
Technical field
The present invention relates to a kind of projection display equipment, be meant that especially a kind of is the projection display equipment of light source with the laser array.
Background technology
As for the light source such as Halogen lamp LED or high-pressure sodium lamp of projection display equipment, laser can send the light than high color purity with respect to tradition, makes can have preferable color reprodubility with laser as the projection display equipment of light source.
As shown in Figure 1, having now a kind of is the projection display equipment of light source with the diode laser matrix, with the light beam that each laser diode sent on the diode laser matrix 11, converge to enter with condenser lens 12 and carry out homogenising in the integration rod 13, adjust beam size via lens combination 14 then and produce image, utilize projection lens 16 that image is projeced on the screen 17 at last to be projeced into light valve 15.
Yet, because the intrinsic height directive property of light beam of laser diode, even in integration rod 13, carry out after the several reflection, still be difficult for forming the uniform light beam of intensity, present the phenomenon that local strength concentrates easily on beam cross section, wherein a kind of solution is with the length growth of integration rod 13, and the order of reflection of light beam in integration rod 13 increased, with the effect of raising homogenising, but can cause whole projection display equipment volume to increase because of integration rod 13 length increase.
In addition, also, make and reduced the quality of image that light valve 15 is produced by light beam formed speckle (speckle) on shadow surface owing to the intrinsic height coherence of light beam of laser diode.
Summary of the invention
The purpose of this invention is to provide a kind of projection display equipment, and make projection display equipment have the light source module of the preferable quality of image with preferable quality of image.
Other purpose of the present invention and advantage can be further understood from technical characterictic disclosed in this invention.
For reaching above-mentioned one or partly or all purposes or other purpose, one embodiment of the invention provide a kind of projection display equipment, comprise laser array, reflection type unit, diffused component, evenly optical element, lens combination, light valve, and projection lens; Laser array has a plurality of laser cells with arranged, and each laser cell sends a laser beam; Reflection type unit is formed with a plurality of planes of reflection that are not parallel to each other, and receives and converge those laser beam in order to correspondence; Diffused component is configured on the bang path of those laser beam, and is used to spread the laser beam that those converge, to form illuminating bundle; Evenly optical element, lens combination, and light valve be configured in successively on the bang path of illuminating bundle respectively.Evenly optical element is used for this diffused illuminating beams of homogenising; Lens combination is used to adjust the sectional area of the illuminating bundle after the homogenising; It is image strip that light valve is used to change the illuminating bundle of adjusting behind the sectional area; Projection lens is configured on the bang path of image strip, is used for projection image's light beam to screen, to form picture.
In addition, one embodiment of the invention provide a kind of light source module, are applicable to projection display equipment, and this light source module comprises laser array, reflection type unit, diffused component, and even optical element; Laser array has a plurality of laser cells with arranged, and each laser cell sends a laser beam; Reflection type unit is formed with a plurality of planes of reflection that are not parallel to each other, and is used for corresponding those laser beam that receives and converge; Diffused component is configured on the bang path of those laser beam, and is used to spread the laser beam that those converge; Evenly optical element is configured on the bang path of illuminating bundle, and is used for the homogenising illuminating bundle.
Before entering even optical element in laser beam, the laser beam of utilizing diffused component to make earlier to converge on the diffused component forms the diffusion light beam of dispersing, the diffusion light beam is entered in the even optical element, can really light beam be given homogenising, prevent the known phenomenon generation that local strength concentrates that on beam cross section, presents, not only can improve the quality of image of light valve, and not need the length of integration rod is increased.
And, cooperate the laser beam that will converge at diffused component with actuating unit by reflection type unit, on diffused component, carry out reciprocating type moving with a preset frequency, can destroy the intrinsic coherence of laser beam really, to improve the negative effect that speckle causes the light valve quality of image.
Description of drawings
Fig. 1 is the synoptic diagram of existing projection display equipment;
Fig. 2 is the synoptic diagram of the projection display equipment of one embodiment of the invention;
Fig. 3 is the partial schematic diagram of one embodiment of the invention;
Fig. 4 is the partial schematic diagram of another embodiment of one embodiment of the invention;
Fig. 5 is the partial schematic diagram of the another embodiment of one embodiment of the invention; And
Fig. 6 is the synoptic diagram of the projection display equipment of another embodiment of the present invention.
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in a following cooperation DETAILED DESCRIPTION OF THE PREFERRED with reference to the accompanying drawings, can clearly present.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are directions with reference to the accompanying drawings.Therefore, the direction term of use is to be used for illustrating not to be to be used for limiting the present invention.
Before the present invention is described in detail, be noted that in the following description content similar elements is to represent with identical numbering.
As shown in Figure 2, the projection display equipment of one embodiment of the invention comprises three and is respectively ruddiness, green glow, and the actuating unit 23 of the reflection type unit 22 of the laser array 21 of blue light, three corresponding laser arrays 21 of difference, three corresponding reflection type unit 22 of difference, diffused component 26, evenly optical element 27, lens combination 30, light valve 31, and projection lens 32.Wherein, laser array 21, reflection type unit 22, actuating unit 23, diffused component 26, and even optical element 27 constitutes the light source module of projection display equipment.
As shown in Figure 3, with the laser array 21 of a shade wherein is the example explanation, two laser arrays are except that the coloured light difference that produces in addition, all the other structures are all identical, laser array 21 has three laser cells of arranging with 1 * 3 matrix-style of one dimension 211 respectively, each laser cell 211 sends the laser beam with coherence, and those laser cells 211 are issued to the laser beam of reflection type unit 22 for being parallel to each other.In the present embodiment, the laser cell 211 of those laser arrays 21 is a laser diode.
Reflection type unit 22 has body 221, and a plurality of compartment of terrain is formed at the plane of reflection 222 of body 221 towards laser array 21 1 sides.A plurality of planes of reflection 222 are not parallel to each other, and correspondence receives the laser beam that those laser cells 211 send respectively, and with different angles those laser beam reflections are converged on the diffused component 26 respectively.
The embodiment of another kind of reflection type unit 24, as shown in Figure 4, each laser array 21 has three laser cells of arranging with 1 * 3 matrix-style of one dimension 211 respectively, each laser cell 211 sends the laser beam with coherence, and those laser cells 211 are issued to the laser beam of reflection type unit 22 for being parallel to each other.
Reflection type unit 24 has a plurality of bodies 241, in the present embodiment, with three independently body 241 be example, and a plurality of compartment of terrain is formed at the plane of reflection 242 of body 241 towards laser array 21 1 sides.A plurality of planes of reflection 242 are not parallel to each other, and correspondence receives the laser beam that those laser cells 211 send respectively, and with different angles those laser beam reflections are converged on the diffused component 26 respectively.
Perhaps, the another kind of embodiment of using the laser array 25 of two dimension, as shown in Figure 5, each laser array 25 has six laser cells of arranging with 2 * 3 matrix-style 251 respectively, each laser cell 251 sends the laser beam with coherence, and those laser cells 251 are issued to the laser beam of reflection type unit 22 for being parallel to each other.
Reflection type unit 22 has body 221, and a plurality of compartment of terrain is formed at the plane of reflection 222 of body 221 towards laser array 25 1 sides.A plurality of planes of reflection 222 are not parallel to each other, and correspondence receives the laser beam that those laser cells 251 send respectively, and those laser beam reflections are converged on the diffused component 26.
It should be noted that, wherein, though it is slightly different that the two row laser cells 251 up and down of laser array 25 reflect in two convergent points of diffused component 26 via reflection type unit 22, as long as make two convergent points all fall within the same location more among a small circle of diffused component 26.
As shown in Figure 2, actuating unit 23 is used to make those reflection type unit 22 to produce small motions such as reciprocating type vibrations, rotation or swing, and the laser beam that those formula unit 22 that are reflected are converged on the diffused component 26 is carried out reciprocating type a little moving.Wherein, need make laser beam that the formula unit 22 that is reflected converges with respect to the reciprocating type travel frequency of diffused component 26 greater than 40Hz.In the situation of Fig. 3 and Fig. 5, actuating unit 23 is for being attached at the motor on the body 221.And in the situation of Fig. 4, actuating unit 23 comprises a plurality of motors that are attached at one to one respectively on those bodies 241.
As Fig. 2 and shown in Figure 3, diffused component 26 is configured on the bang path by reflection type unit 22 laser light reflected bundles, and diffused component 26 is arranged on the place that converges of reflector element 22 laser light reflected bundles, it can be the diffusion sheet that frosted glass etc. has the light diffusion effect, makes laser beam that those formula unit that are reflected converge form the illuminating bundles of dispersing together penetrating diffused component 26 backs.In addition, also can use, or concavees lens etc. have the optical element of light diffusion effect as diffused component 26 as holographic optical elements (HOE) (HOE), diffraction optical element (DOE).
As shown in Figure 2, evenly optical element 27 is configured on the bang path of illuminating bundle, is used for the homogenising illuminating bundle, makes illuminating bundle carry out producing the uniform light beam of cross-sectional strength after the repeatedly total reflection within it.Evenly optical element 27 for example is solid or hollow integration rod, but not as limit.
Lens combination 30 and light valve 31 are configured on the bang path of illuminating bundle successively, and lens combination 30 is evenly between optical element 27 and the light valve 31.Lens combination 30 comprises the different lens of a focusing, be used for after accepting the uniform illuminating bundle of this intensity, the sectional area of illuminating bundle is adjusted into suitable area size to be projeced into light valve 31, make light valve 31 after receiving illuminating bundle, illuminating bundle is converted to the uniform image strip of intensity, by the projection lens on the bang path that is configured in image strip 32 image strip is projected on the screen 33, to form picture (scheming not shown).Wherein, light valve 31 is penetrate through type liquid crystal display board (LCD).In addition, also can adjust light path design ordinatedly to use reflective Digital Light Processor (DLP) or liquid crystal over silicon display device such as (LCOS).
In addition, the light path arrangement of another kind of light source module, as shown in Figure 6, coaxial catoptron 29 and two dichroic mirror 28a, 28b have been increased in light source module, catoptron 29 is with reflection type unit 22a laser light reflected bundle, and reflection penetrates two dichroic mirror 28a, 28b and converges on the diffused component 26.Dichroic mirror 28a is with reflection type unit 22b laser light reflected bundle, and reflection is passed dichroic mirror 28b and converged on the diffused component 26.Dichroic mirror 28b is with reflection type unit 22c laser light reflected bundle, and reflection converges on the diffused component 26.Laser beam is converged on the diffused component 26 in a coaxial fashion via catoptron 29 and two dichroic mirror 28a, 28b, also can make the total system volume-diminished.
Conclude above-mentioned, by entering in laser beam before the even optical element 27, utilize diffused component 26 earlier, make the laser beam that converges on the diffused component 26 form the diffusion light beam of dispersing earlier, the diffusion light beam is entered in the even optical element 27, can really light beam be given homogenising, prevent to have now and on beam cross section, present the phenomenon that local strength concentrates and take place, can improve the quality of image of light valve 31, and not need the length of integration rod is increased.
And, cooperate the laser beam that will converge at diffused component 26 by reflection type unit 22 with actuating unit 23, on diffused component 26, carry out reciprocating type moving with preset frequency, can destroy the intrinsic coherence of laser beam really, to improve the negative effect that speckle causes light valve 31 qualities of image.
The above only is the preferred embodiments of the present invention, can not limit scope of the invention process with this, and promptly all simple equivalent of being done according to claim of the present invention and invention description content change and modify, and all still belongs in the scope that patent of the present invention contains.Arbitrary embodiment of the present invention in addition or claim must not reached whole purpose disclosed in this invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.

Claims (22)

1, a kind of projection display equipment comprises:
At least one laser array has a plurality of laser cells with arranged, and each described laser cell gives off laser beam;
At least one reflection type unit is formed with a plurality of planes of reflection that are not parallel to each other, and is used for the corresponding described laser beam that receives and converge;
Diffused component is disposed on the bang path of described laser beam, is used to spread the described laser beam that is converged by described reflection type unit, to form illuminating bundle;
Evenly optical element is disposed on the bang path of described illuminating bundle, is used for the described illuminating bundle of homogenising;
Lens combination is disposed on the bang path of described illuminating bundle and is positioned at after the described even optical element, is used to adjust the sectional area of described illuminating bundle;
Light valve is disposed on the bang path of described illuminating bundle and is positioned at after the described lens combination, and being used to change described illuminating bundle is image strip; And
Projection lens is disposed on the bang path of described image strip, is used to throw described image strip to screen, to form picture.
2, projection display equipment as claimed in claim 1, wherein, described at least one laser array is three laser arrays.
3, projection display equipment as claimed in claim 1, wherein, described laser array outgoing to the described laser beam of described reflection type unit is parallel to each other.
4, projection display equipment as claimed in claim 1, wherein, described reflection type unit has body, and described plane of reflection compartment of terrain is formed at the side of described body towards described laser array.
5, projection display equipment as claimed in claim 4 also comprises the actuating unit that is used to make described reflection type unit generation motion, makes the described laser beam that is converged by described reflection type unit carry out reciprocating type moving thus.
6, projection display equipment as claimed in claim 5, wherein, described actuating unit is a motor, is attached on the described body.
7, projection display equipment as claimed in claim 5, wherein, it is one of reciprocating type vibrations, rotation or swing that described actuating unit makes the mode of described reflection type unit motion.
8, projection display equipment as claimed in claim 5, wherein, the described laser beam that is converged by described reflection type unit with respect to the reciprocating type travel frequency of described diffused component greater than 40Hz.
9, projection display equipment as claimed in claim 1, wherein, described reflection type unit has a plurality of bodies, and each described plane of reflection compartment of terrain is formed at the side of each described body towards described laser array.
10, projection display equipment as claimed in claim 9 also comprises the actuating unit that is used to make described reflection type unit generation motion, makes the described laser beam that is converged by described reflection type unit carry out reciprocating type moving thus.
11, projection display equipment as claimed in claim 10, wherein, described actuating unit comprises a plurality of motors that are attached at respectively on the described body.
12, projection display equipment as claimed in claim 10, wherein, the described laser beam that is converged by described reflection type unit with respect to the reciprocating type travel frequency of described diffused component greater than 40Hz.
13, projection display equipment as claimed in claim 1, wherein, described diffused component is arranged at the place that converges of described laser beam, makes described laser beam by penetrating described diffused component to reach diffusion effect.
14, projection display equipment as claimed in claim 13, wherein, described diffused component be frosted glass, diffraction optical element or holographic optical elements (HOE) one of them.
15, projection display equipment as claimed in claim 1, described at least one laser array is two laser arrays that send the laser beam of different color, and described at least one reflection type unit is two reflection type unit, and described projection display equipment also comprises at least one dichroic mirror, so that the described formula unit institute laser light reflected bundle that is reflected converges at described diffused component in a coaxial fashion.
16, a kind of light source module is applicable to projection display equipment, and described light source module comprises:
At least one laser array has a plurality of laser cells with arranged, and each described laser cell gives off laser beam;
At least one reflection type unit is formed with a plurality of planes of reflection that are not parallel to each other, and is used for the corresponding described laser beam that receives and converge;
Diffused component is disposed on the bang path of described laser beam, is used to spread the described laser beam that is converged by described reflection type unit, to form illuminating bundle; And
Evenly optical element is disposed on the bang path of described illuminating bundle, is used for the described illuminating bundle of homogenising.
17, as claim 16 a described light source module, wherein, described laser array outgoing to the described laser beam of described reflection type unit is parallel to each other.
18, light source module as claimed in claim 16, wherein, described reflection type unit has body, and described plane of reflection compartment of terrain is formed at the side of described body towards described laser array.
19, light source module as claimed in claim 18 also comprises the actuating unit that is used to make described reflection type unit generation motion, makes the described laser beam that is converged by described reflection type unit carry out reciprocating type moving thus.
20, light source module as claimed in claim 16, wherein, described reflection type unit has a plurality of bodies, and each described plane of reflection compartment of terrain is formed at the side of each described body towards described laser array.
21, light source module as claimed in claim 16, wherein, described diffused component is arranged at the place that converges of described laser beam, makes described laser beam by penetrating described diffused component to reach diffusion effect.
22, light source module as claimed in claim 16, wherein said at least one laser array is two laser arrays that send the laser beam of different color, and described at least one reflection type unit is two reflection type unit, and described light source module also comprises at least one dichroic mirror, so that describedly converged at described diffused component in a coaxial fashion by described reflection type unit institute laser light reflected bundle.
CNA2007101528306A 2007-09-18 2007-09-18 Projection display and light source module thereof Pending CN101393382A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101937163A (en) * 2009-06-30 2011-01-05 卡西欧计算机株式会社 Light source unit, light source apparatus and projector
CN102402112A (en) * 2011-11-30 2012-04-04 海信集团有限公司 Light source device, light source generation method and laser projector having same
CN103189792A (en) * 2010-09-10 2013-07-03 青岛海信信芯科技有限公司 Stereoscopic projection method and system, and television
CN104793345A (en) * 2014-01-22 2015-07-22 深圳市亿思达科技集团有限公司 Light source system used for eliminating laser speckle
JP2017016155A (en) * 2014-09-30 2017-01-19 キヤノン株式会社 Optical unit and optical device using the same, light source device, and projection type display device
CN107229121A (en) * 2016-03-23 2017-10-03 三星显示有限公司 Wear-type device and display device
CN107561016A (en) * 2017-08-17 2018-01-09 华北电力大学 A kind of system of laser acquisition gas concentration
CN108957924A (en) * 2017-05-24 2018-12-07 深圳市光峰光电技术有限公司 Laser illuminator set and the optical projection system for using the equipment
CN111308643A (en) * 2019-12-25 2020-06-19 Oppo广东移动通信有限公司 Camera module, periscopic camera module, camera assembly and electronic device

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8167440B2 (en) 2009-06-30 2012-05-01 Casio Computer Co., Ltd. Light source unit, light source apparatus and projector
CN101937163B (en) * 2009-06-30 2012-07-04 卡西欧计算机株式会社 Light source unit, light source apparatus and projector
CN101937163A (en) * 2009-06-30 2011-01-05 卡西欧计算机株式会社 Light source unit, light source apparatus and projector
CN103189792A (en) * 2010-09-10 2013-07-03 青岛海信信芯科技有限公司 Stereoscopic projection method and system, and television
CN103189792B (en) * 2010-09-10 2015-08-05 青岛海信信芯科技有限公司 Stereoprojection method and system, televisor
CN102402112A (en) * 2011-11-30 2012-04-04 海信集团有限公司 Light source device, light source generation method and laser projector having same
CN102402112B (en) * 2011-11-30 2013-07-31 海信集团有限公司 Light source device, light source generation method and laser projector having same
CN104793345B (en) * 2014-01-22 2018-08-14 深圳市亿思达科技集团有限公司 A kind of light-source system for eliminating laser speckle
CN104793345A (en) * 2014-01-22 2015-07-22 深圳市亿思达科技集团有限公司 Light source system used for eliminating laser speckle
JP2017016155A (en) * 2014-09-30 2017-01-19 キヤノン株式会社 Optical unit and optical device using the same, light source device, and projection type display device
CN107229121A (en) * 2016-03-23 2017-10-03 三星显示有限公司 Wear-type device and display device
US10983345B2 (en) 2016-03-23 2021-04-20 Samsung Display Co., Ltd. Head-mounted device and display device
CN108957924A (en) * 2017-05-24 2018-12-07 深圳市光峰光电技术有限公司 Laser illuminator set and the optical projection system for using the equipment
CN108957924B (en) * 2017-05-24 2021-07-23 深圳光峰科技股份有限公司 Laser lighting device and projection system using the same
US11307487B2 (en) 2017-05-24 2022-04-19 Appotronics Corporation Limited Laser illumination device and projection system using the same
CN107561016A (en) * 2017-08-17 2018-01-09 华北电力大学 A kind of system of laser acquisition gas concentration
CN107561016B (en) * 2017-08-17 2020-06-09 华北电力大学 System for detecting gas concentration by laser
CN111308643A (en) * 2019-12-25 2020-06-19 Oppo广东移动通信有限公司 Camera module, periscopic camera module, camera assembly and electronic device
CN111308643B (en) * 2019-12-25 2024-04-12 Oppo广东移动通信有限公司 Camera module, periscope type camera module, camera module and electronic device

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