CN113176700A - Pluggable small laser projection device - Google Patents
Pluggable small laser projection device Download PDFInfo
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- CN113176700A CN113176700A CN202110290142.6A CN202110290142A CN113176700A CN 113176700 A CN113176700 A CN 113176700A CN 202110290142 A CN202110290142 A CN 202110290142A CN 113176700 A CN113176700 A CN 113176700A
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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
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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
- G03B21/145—Housing details, e.g. position adjustments thereof
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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
- G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
Abstract
The invention discloses a pluggable small-sized laser projection device which comprises a shell, an end cover and a PCB, wherein the end cover and an opening part of the shell cover to form a cavity; the PCB is integrated with a control unit, a driving unit, a laser emission module, an automatic focusing unit, a power supply unit, a decoder and an external interface, the decoder, the control unit, the driving unit and the laser emission module are sequentially and electrically connected, the external interface is respectively connected with the decoder and the power supply unit, and the control unit is also respectively and electrically connected with the power supply unit and the automatic focusing unit; the emergent end of the laser emission module is coupled with the incident end of the automatic focusing unit; the side wall of the shell is provided with a light outlet and a mounting opening, the position of the light outlet corresponds to the emergent end of the automatic focusing unit, and the position of the mounting opening corresponds to the position of the external interface. The projection device is small in size, portable and flexible in application scene.
Description
Technical Field
The invention belongs to the technical field of projection equipment, and particularly relates to a pluggable small laser projection device.
Background
Laser projectors use a laser beam to transmit a picture. The optical components of the laser projector mainly comprise a red-green-blue three-color light valve, a beam combining X prism, a projection lens and a driving light valve. There are red, green and blue lasers in the laser projector. Laser is expanded by the corresponding optical component and the processing chip in the machine and then is transmitted to the X prism to integrate the three beams of laser, and then the integrated laser is transmitted to the projection screen by the projection objective, so that the display process of the whole laser projector is completed. Laser technology is a future development trend as a projection light source, but it is also true that LEDs cannot be completely replaced in a short period of time. However, with the development of technology, laser light sources will be popularized in the projection field, and then the display technology will be revolutionary, and the traditional display field will be thoroughly subverted.
One conventional laser projector employs DLP technology, i.e., a Digital Light Processor (DLP) projector, which is a single-chip projector or a three-chip projector. The key imaging Device DMD (Digital micro mirror Device) of a DLP projector is a semiconductor element. The element has the performance of a quick reflection type digital switch, and can accurately control a light source. The light source is projected on the DMD component through a three-color lens rotating at a high speed, and is projected on the screen through the lens after being reflected by the DMD to form an image.
In the prior art, the laser projector has limited application scenes, is generally used in places of families, meeting rooms and cinemas, and replaces the traditional television and projector. The main reason is that the prior art has a complex structure, the whole device has a large volume and high power consumption, and can not meet the requirements of new projection fields, such as portable projectors which are hot-plugged with mobile phones, vehicle-mounted parallel display projectors, advertisement exhibition projectors and other application scenes, which can not apply the prior art; and the existing projector can not automatically adjust the projection focal length according to the projection distance, can not adjust the brightness of the projected image according to the environmental light brightness, and can not adapt to the requirements of modern application scenes.
Disclosure of Invention
The invention aims to provide a pluggable small laser projection device, which solves the problems of large size, complex structure, limited application scene and the like of a laser projector in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pluggable small-sized laser projection device comprises a shell, an end cover and a PCB, wherein the end cover and an opening part of the shell cover to form a cavity, and the PCB is arranged in the cavity; the PCB is integrated with a control unit, a driving unit, a laser emission module, an automatic focusing unit, a power supply unit, a decoder and an external interface, the decoder, the control unit, the driving unit and the laser emission module are sequentially and electrically connected, the external interface is respectively connected with the decoder and the power supply unit, and the control unit is also respectively and electrically connected with the power supply unit and the automatic focusing unit; the emergent end of the laser emission module is coupled with the incident end of the automatic focusing unit; the side wall of the shell is provided with a light outlet and a mounting opening, the position of the light outlet corresponds to the emergent end of the automatic focusing unit, and the position of the mounting opening corresponds to the position of the external interface.
Specifically, the automatic focusing unit comprises a stepping motor, a zoom type projection lens and a distance measuring sensor, wherein the stepping motor and the distance measuring sensor are electrically connected with the control unit respectively, the distance measuring sensor is used for detecting the distance from a light outlet to a projection screen, and the control unit controls the stepping motor to adjust the projection focal length of the zoom type projection lens according to the distance so as to improve the quality of a projected image.
Specifically, the laser emission module is an RGB three-primary-color laser emitter, and the laser emission module is configured to mix red (R), green (G), and blue (B) three-primary-color monochromatic laser light sources into a full-color laser beam; the line and field scanning can be realized, the scanning speed is higher than the imaging critical flicker frequency, the requirement of 'visual residual' of human eyes can be met, and the human eyes can clearly observe.
Preferably, the external interface comprises a Type-C interface, the Type-C interface integrates a charging circuit and a data transmission circuit, the charging circuit is electrically connected with the power supply unit, and the data transmission circuit is connected with the decoder. The Type-C interface can be used as a charging interface and a data transmission interface, so that the number of external interfaces is reduced, and the integration level of the device is improved.
Preferably, the power supply unit is configured with a slow start circuit, and the hot plug function of the projection device can be realized by arranging the slow start circuit, so that the convenience and the reliability of the practical application of the projection device are improved.
Preferably, a plurality of photosensitive sensors are arranged on the PCB and used for detecting the brightness of the ambient light, and the plurality of photosensitive sensors are electrically connected with the control unit respectively. The brightness of the ambient light is detected by arranging the photosensitive sensors, the brightness of the projected image can be automatically adjusted according to the brightness of the ambient light, and the viewing experience of the projected image is prevented from being influenced by over brightness or over darkness.
Specifically, the lateral wall of shell is equipped with a plurality of sensitization holes, and is a plurality of the position in sensitization hole corresponds with a plurality of photosensitive sensor's position respectively. Can set up transparent dust cover in the sensitization hole, avoid the dust to get into the inside whole performance that influences of projection arrangement from the sensitization hole.
Compared with the prior art, the invention has the beneficial effects that: (1) the projection device has small volume, portability and flexible application scene; the hot plug function is supported, and the device is easy to integrate into other equipment to expand the application, so that the convenience, reliability and expandability of the practical application of the invention are improved; (2) the projection device is internally provided with the automatic focusing unit, and the projection focal length can be automatically adjusted according to the projection distance, so that the flexibility and the reliability of the projection device are improved; (3) the photosensitive sensor is arranged in the projection device, the brightness of the ambient light can be detected, and the brightness of the projected image is adaptively adjusted according to the brightness of the ambient light, so that the watching experience of a user is improved.
Drawings
Fig. 1 is an exploded schematic view of a pluggable compact laser projection apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an installation structure of each functional unit on a PCB board according to an embodiment of the present invention;
in the figure: 1. a housing; 2. an end cap; 3. a PCB board; 4. a control unit; 5. a drive unit; 6. a laser emission module; 7. an automatic focusing unit; 8. a power supply unit; 9. a decoder; 10. a Type-C interface; 11. a light outlet; 12. an installation port; 13. a photosensitive sensor; 14. and a photosensitive hole.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the embodiment provides a pluggable small-sized laser projection apparatus, which includes a housing 1, an end cover 2 and a PCB 3, where the end cover 2 covers an opening of the housing 1 to form a cavity, and the PCB 3 is installed in the cavity; the PCB 3 is integrated with a control unit 4, a driving unit 5, a laser emission module 6, an automatic focusing unit 7, a power supply unit 8, a decoder 9 and an external interface, the decoder 9, the control unit 4, the driving unit 5 and the laser emission module 6 are sequentially and electrically connected, the external interface is respectively connected with the decoder 9 and the power supply unit 8, and the control unit 4 is also respectively and electrically connected with the power supply unit 8 and the automatic focusing unit 7; the emergent end of the laser emission module 6 is coupled with the incident end of the automatic focusing unit 7; the side wall of the shell 1 is provided with a light outlet 11 and a mounting port 12, the position of the light outlet 11 corresponds to the emergent end of the automatic focusing unit 7, and the position of the mounting port 12 corresponds to the position of the external interface.
Specifically, autofocus unit 7 includes step motor, the formula of zooming projection mirror and range finding sensor, step motor, range finding sensor are connected with control unit 4 electricity respectively, range finding sensor is used for detecting out the distance of light-emitting window 11 to the projection curtain, control unit 4 basis the projection focus of the formula of zooming projection mirror is adjusted to distance control step motor, guarantees the definition of full-color laser projection to target projection curtain to improve the quality of projection image.
Specifically, the laser emission module 6 is an RGB three-primary-color laser emitter, and the laser emission module 6 is configured to mix red (R), green (G), and blue (B) three-primary-color monochromatic laser light sources into a full-color laser beam; the line and field scanning can be realized, the scanning speed is higher than the imaging critical flicker frequency, the requirement of 'visual residual' of human eyes can be met, and the human eyes can clearly observe. The critical flicker frequency is not lower than 50 Hz. The RGB three primary colors laser emitter outputs full color laser which is projected to an external target projection screen through an automatic focusing unit 7 to generate a high-quality video.
Preferably, the external interface includes a Type-C interface 10, the Type-C interface 10 integrates a charging circuit and a data transmission circuit, the charging circuit is electrically connected to the power supply unit 8, and the data transmission circuit is connected to the decoder 9. The Type-C interface 10 can be used as a charging interface and a data transmission interface, so that the number of external interfaces is reduced, and the integration level of the device is improved.
The Type-C interface 10 is an external interface of the device, conforms to the USB3.1 standard, and integrates the functions of power supply, data transmission and audio-video transmission. The front and the back of the Type-C interface are the same, the function of 'forward and reverse insertion' which can be inserted from the front and the back is supported, the problem that the USB is always inserted inaccurately is solved, and 1 ten thousand times of repeated insertion and extraction can be borne. The maximum data transmission speed of the Type-C interface can reach 10 Gbit/s, namely the standard of USB 3.1. The Type-C supports a USB PD protocol (namely a power transmission protocol), the protocol can realize higher voltage and current, the transmitted power can reach 100 watts at most, and the application scene of higher power of the invention can be supported. USB 3.2 is the USB transmission standard newly introduced by the USB-IF organization in 2017 in 9 months, and the USB-IF lists Type-C as the only recommended interface when establishing the USB 3.2 standard. The USB 3.2 is changed in that the USB supports seamless switching between a single channel and a double channel between host equipment and peripheral equipment, and the double-channel technology is utilized, so that the transmission rate is doubled and can reach 20Gbps at most. The Thunderbolt lightning 3 is changed into USB Type-C from the prior mini DP, the highest bandwidth of the interface can reach 40Gb/s, which is 8 times of that of USB3.0 and 4 times of that of USB 3.1. The Type-C interface covers the fields of mobile phones, PCs, peripheral equipment, digital earphones, VR/AR, flat-panel televisions, automobiles, universal Internet of things terminals and the like, and is wide in use and high in universality.
Specifically, in this embodiment, the decoder 9 adopts an h.264/265 decoder 9, and the h.264/265 decoder 9 is a video encoder of the apparatus of the present invention, and complies with the h.264/265 video coding standard specified by ITU-T VCEG. The h.264/265 decoder 9 preferably uses the h.265 video coding standard, and the h.265 is intended to transmit higher quality network video under limited bandwidth, and only half of the original bandwidth is required to play the same quality video. This also means that devices such as smart phones, tablets and the inventive apparatus will be able to directly play 1080p full high definition video online. The h.265 standard also supports both 4K (4096 × 2160) and 8K (8192 × 4320) ultra high definition video.
Specifically, the control unit 4 is a microprocessor, which is a control center of the projection apparatus of the present invention, and connects various parts of the entire projection apparatus by using various interfaces and lines, and executes various functions of the projection apparatus and processes data by running or executing a program stored in the memory and calling data stored in the memory.
Preferably, the power supply unit 8 is configured with a slow start circuit, and a Hot plug function of the projection apparatus of the present invention can be realized by setting the slow start circuit, and a Hot plug (Hot Swap) means that the present invention is inserted into or pulled out of a system without affecting the normal operation of the system under the condition of not turning off a power supply of the system, so that the reliability, the quick maintainability, the redundancy, the timely recovery capability to a disaster, etc. of the system are improved. The invention supports hot plug, is plug and play, can be pulled out after being used up, and improves the convenience and reliability of the practical application of the invention.
Preferably, a plurality of light sensors 13 are disposed on the PCB 3 for detecting the brightness of the ambient light, and the plurality of light sensors 13 are electrically connected to the control unit 4 respectively. Through setting up a plurality of photosensitive sensor 13 and detecting the luminance of ambient light, can be according to the luminance automatically regulated projection image's of ambient light luminance, avoid the projection image too bright or cross dark influence to watch experience.
Specifically, in this embodiment, the number of the photosensitive sensors 13 is 5, two photosensitive sensors are respectively disposed on the left side and the right side of the housing 1, and one photosensitive sensor is disposed on one side of the light outlet 11, in this embodiment, the plurality of photosensitive sensors are disposed around the housing 1, and the actual brightness value of the ambient light is obtained through comprehensive analysis, so that the influence on the overall projection brightness due to the shielding of individual photosensitive sensors is avoided; when the brightness value of the ambient light is comprehensively analyzed according to 5 photosensitive sensors, the weight of 4 photosensitive sensors on two sides of the shell 1 is 15% respectively, and the weight of the photosensitive sensor on one side of the light outlet 11 is 40%, because the light outlet 11 is not easily shielded when the projection device is placed, if a shielding object is arranged on one side of the light outlet 11, the integrity of a projection picture is directly influenced, therefore, the weight of the ambient light brightness value measured by the photosensitive sensor on one side of the light outlet 11 is larger, but because the ambient light brightness value is positioned on one side of the light outlet 11, the detected ambient light brightness is influenced by the reflection of the projection light beam on the projection screen, and the occupied weight can not be too high; according to the method and the device, different weights are configured for the photosensitive sensors at different positions, so that the accuracy of ambient light detection is improved, and the quality of projected images is improved.
Specifically, the side wall of the housing 1 is provided with a plurality of photosensitive holes 14, and the positions of the plurality of photosensitive holes 14 correspond to the positions of the plurality of photosensitive sensors 13, respectively. A transparent dust cover can be arranged in the photosensitive hole 14, so that dust is prevented from entering the projection device from the photosensitive hole 14 to influence the overall performance.
In this embodiment, the Type-C interface 10 is configured to access the projection apparatus of the present invention to an external device (e.g., a mobile phone) to obtain image data to be projected in the external device, the decoder 9 is loaded with a video decoding program therein, and is configured to decode the image data and convert the image data into video data in a specific format, the control unit 4 sends a control instruction to the driving unit 5 according to the video data, the driving unit 5 drives the RGB three-primary-color laser device to emit a laser beam according to the control instruction, and the auto-focusing unit 7 projects the laser beam onto a projection screen for display, and automatically adjusts a projection focal length according to a projection distance.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product.
Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A pluggable small-sized laser projection device is characterized by comprising a shell, an end cover and a PCB, wherein the end cover and an opening part of the shell cover to form a cavity, and the PCB is arranged in the cavity; the PCB is integrated with a control unit, a driving unit, a laser emission module, an automatic focusing unit, a power supply unit, a decoder and an external interface, the decoder, the control unit, the driving unit and the laser emission module are sequentially and electrically connected, the external interface is respectively connected with the decoder and the power supply unit, and the control unit is also respectively and electrically connected with the power supply unit and the automatic focusing unit; the emergent end of the laser emission module is coupled with the incident end of the automatic focusing unit; the side wall of the shell is provided with a light outlet and a mounting opening, the position of the light outlet corresponds to the emergent end of the automatic focusing unit, and the position of the mounting opening corresponds to the position of the external interface.
2. The pluggable compact laser projection apparatus of claim 1, wherein the auto-focusing unit comprises a stepping motor, a variable focus projection lens and a distance measuring sensor, and the stepping motor and the distance measuring sensor are electrically connected to the control unit respectively.
3. The pluggable compact laser projector of claim 1, wherein the laser emitting module is an RGB three primary color laser emitter.
4. The pluggable small laser projection apparatus according to claim 1, wherein the external interface comprises a Type-C interface, the Type-C interface integrates a charging circuit and a data transmission circuit, the charging circuit is electrically connected to the power supply unit, and the data transmission circuit is connected to the decoder.
5. The pluggable compact laser projection apparatus of claim 1, wherein the power supply unit is configured with a slow start circuit.
6. The pluggable compact laser projector as claimed in claim 1, wherein the PCB board is provided with a plurality of photosensitive sensors for detecting the brightness of the ambient light, and the plurality of photosensitive sensors are electrically connected to the control unit respectively.
7. The pluggable compact laser projector as claimed in claim 6, wherein the side wall of the housing has a plurality of photosensitive holes, and the positions of the photosensitive holes correspond to the positions of the photosensitive sensors respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110290142.6A CN113176700A (en) | 2021-03-18 | 2021-03-18 | Pluggable small laser projection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110290142.6A CN113176700A (en) | 2021-03-18 | 2021-03-18 | Pluggable small laser projection device |
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| Publication Number | Publication Date |
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| CN113176700A true CN113176700A (en) | 2021-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110290142.6A Pending CN113176700A (en) | 2021-03-18 | 2021-03-18 | Pluggable small laser projection device |
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| CN (1) | CN113176700A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203275866U (en) * | 2013-05-23 | 2013-11-06 | 赵鹏 | Projector |
| CN203827446U (en) * | 2014-03-31 | 2014-09-10 | 上海长城计算机网络工程有限公司 | Automatic low-radiation minisize projection, movie and television entertainment machine |
| CN204376999U (en) * | 2015-02-15 | 2015-06-03 | 上海新岸线电子技术有限公司 | A kind of micro projector and mobile terminal |
| CN204595407U (en) * | 2015-04-22 | 2015-08-26 | 深圳市鹏城明泰科技有限公司 | A kind of portable micro-projector |
| CN106527023A (en) * | 2015-11-16 | 2017-03-22 | 重庆帝盟沃克商务有限公司 | Automatic focusing projector |
| CN207924348U (en) * | 2018-03-14 | 2018-09-28 | 深圳市富顺和盈电子有限公司 | Portable laser projecting apparatus |
-
2021
- 2021-03-18 CN CN202110290142.6A patent/CN113176700A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203275866U (en) * | 2013-05-23 | 2013-11-06 | 赵鹏 | Projector |
| CN203827446U (en) * | 2014-03-31 | 2014-09-10 | 上海长城计算机网络工程有限公司 | Automatic low-radiation minisize projection, movie and television entertainment machine |
| CN204376999U (en) * | 2015-02-15 | 2015-06-03 | 上海新岸线电子技术有限公司 | A kind of micro projector and mobile terminal |
| CN204595407U (en) * | 2015-04-22 | 2015-08-26 | 深圳市鹏城明泰科技有限公司 | A kind of portable micro-projector |
| CN106527023A (en) * | 2015-11-16 | 2017-03-22 | 重庆帝盟沃克商务有限公司 | Automatic focusing projector |
| CN207924348U (en) * | 2018-03-14 | 2018-09-28 | 深圳市富顺和盈电子有限公司 | Portable laser projecting apparatus |
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Application publication date: 20210727 |