CN113253560B - Protection structure for lens of film and television projector and projector - Google Patents
Protection structure for lens of film and television projector and projector Download PDFInfo
- Publication number
- CN113253560B CN113253560B CN202110794170.1A CN202110794170A CN113253560B CN 113253560 B CN113253560 B CN 113253560B CN 202110794170 A CN202110794170 A CN 202110794170A CN 113253560 B CN113253560 B CN 113253560B
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- lens
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- dust removal
- piston
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- 239000000428 dust Substances 0.000 claims abstract description 129
- 230000001681 protective effect Effects 0.000 claims abstract description 28
- 238000004804 winding Methods 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000004140 cleaning Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/14—Wipes; Absorbent members, e.g. swabs or sponges
- B08B1/143—Wipes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Lens Barrels (AREA)
Abstract
The invention relates to the technical field of projectors, in particular to a lens protection structure of a video projector and the projector, which comprises a lens body and a mounting seat, wherein the lens body is movably arranged on the mounting seat, and the invention also comprises: the protective cylinder is arranged on the mounting seat, and the lens body is arranged in the protective cylinder; the dust removal sleeve is arranged in the protective cylinder and is connected with the lens body; the dust removal assembly is arranged on the dust removal sleeve and used for removing dust attached to the lens body; whole flow adopts simple mechanical structure, and degree of automation is high not only, has still avoided the work of traditional artifical clearance lens moreover, in time clears up the lens, avoids the dust to cause the influence to lens surface quality.
Description
Technical Field
The invention relates to the technical field of projectors, in particular to a lens protection structure of a video projector and the projector.
Background
The film projector was invented by tomas edison in 1888, and has become a very mature means for playing video after the continuous improvement of later people; but with the development of digital technology, conventional film projectors have gradually exited the historical arena.
The lens is a key part for imaging and projection of the projector, belongs to precision equipment, has certain requirements on the temperature of a use environment, moderate degree and cleanliness, and particularly has the effect that dust and dust can seriously reduce the display brightness of the projector and influence the service life of internal glass components.
Traditional projector is when placing for a long time, and a large amount of dusts can be attached to the lens surface, needs the staff in time to clear up the work to the dust, in case the clearance is untimely, the dust can lead to the fact wearing and tearing to the lens surface, and the film effect is watched in the influence.
Disclosure of Invention
The present invention is directed to a lens protection structure for a video projector and a video projector, so as to solve the above problems.
In order to achieve the purpose, the invention provides the following technical scheme:
a protection structure for lens of film and television projector comprises a lens body and a mounting seat, wherein the lens body is movably arranged on the mounting seat, and the protection structure also comprises:
the protective cylinder is arranged on the mounting seat, and the lens body is arranged in the protective cylinder;
the dust removal sleeve is arranged in the protective cylinder and is connected with the lens body; and
the dust removal assembly is arranged on the dust removal sleeve and used for removing dust attached to the lens body; wherein
The dust removal assembly comprises:
the double-layer lens unit comprises an outer lens and an inner lens, the double-layer lens unit is connected with the lens body, and a spacing cavity is formed between the outer lens and the inner lens;
the sliding seat is movably arranged in the interval cavity body, and the sliding seat is attached to and sealed with the inner wall of the interval cavity body;
the dust removing wiper is in sliding fit with the outer lens, and magnets are arranged in the dust removing wiper and the sliding seat; and
the driving module is movably arranged on the dust removing sleeve and is used for adjusting the position of the dust removing wiper;
the dust removing device comprises a lens body, a mounting seat and a driving module, wherein the lens body is arranged on the mounting seat, the mounting seat is arranged on the lens body, the driving module is arranged on the mounting seat, and the driving module is used for driving the driving module to rotate.
The application further adopts the technical scheme that: the driving module includes:
the winding wheel is movably arranged on the dust removal sleeve and is in sliding fit with the protection cylinder;
the first piston is movably arranged in a cavity formed in the dust removal sleeve and is elastically connected with the cavity, the first piston is attached to the inner wall of the cavity in a sealing manner, and the cavity is communicated with the spacing cavity; and
a flexible member connected between the take-up wheel and the first piston.
The application further adopts the technical scheme that: the dust removing assembly further comprises a dust falling hole, and the dust falling hole is formed in the dust removing sleeve and is located on a moving path of the dust removing eraser;
and the protective cylinder is provided with a dust exhaust window matched with the dust falling hole.
The application further adopts the technical scheme that: the auxiliary mechanism is arranged on the dust removal sleeve and is used for assisting the cleaning work of dust on the outer lens;
the auxiliary mechanism is connected with the dust removal assembly, and the auxiliary mechanism is controlled to work synchronously when the dust removal assembly works.
This application still further technical scheme: the auxiliary mechanism comprises a hollow pipe, a second piston, a flow channel and a transmission piece;
the hollow pipe is arranged on the dust removal sleeve, the flow channel is arranged in the dust removal sleeve and is communicated with the dust falling hole, and the hollow pipe is communicated with the flow channel;
the second piston is movably arranged in the hollow pipe, the second piston is attached to and sealed with the inner wall of the hollow pipe, and in addition, the second piston is connected with the dust removal assembly through the transmission piece.
A projector comprises a projector body and a lens protection structure in the technical scheme, wherein the lens protection structure is arranged on the projector body, and the projector further comprises a supporting unit which is arranged on the projector body and used for supporting the projector body;
the projector body is also provided with a groove for accommodating the supporting unit.
This application still further technical scheme: the number of the supporting units is a plurality of groups, and each group of the supporting units comprises a supporting foot, a driving rod, a guide rod, an adjusting seat and a locking piece;
the supporting foot is movably arranged on the projector body, the adjusting seat is movably arranged on the guide rod, and the adjusting seat is movably connected with the supporting foot through the driving rod;
the locking piece is arranged between the adjusting seat and the guide rod and used for fixing the position of the adjusting seat on the guide rod.
Compared with the prior art, the technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, by arranging the linkage structure, the position of the lens body is adjusted through the power source to perform focusing work, and simultaneously, the winding wheel is driven to synchronously rotate under the action of frictional resistance between the winding wheel and the inner wall of the protective cylinder, so that the flexible piece is wound to adjust the position of the first piston, and further the dust removing eraser is driven to clean dust attached to the outer lens.
Drawings
FIG. 1 is a schematic view of a lens protection structure of a video projector according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a dust removing assembly in a lens shielding structure of a video projector according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a shield cylinder in a lens shield structure of a video projector according to an embodiment of the present invention;
FIG. 4 is an enlarged view of the auxiliary mechanism of FIG. 3 in the lens shielding structure of the video projector according to the embodiment of the present invention;
FIG. 5 is a schematic view of a projector according to an embodiment of the present invention;
FIG. 6 is a schematic view of a support unit in a projector according to an embodiment of the present invention;
FIG. 7 is a schematic view of an adjustment knob and a locking lever of a projector according to an embodiment of the present invention.
The reference numerals in the schematic drawings illustrate:
1-a lens body, 2-a protective barrel, 3-a mounting seat, 4-an electric telescopic rod, 5-a dust removal sleeve, 6-a dust removal window, 7-a dust removal component, 701-a winding wheel, 702-an outer lens, 703-an inner lens, 704-a dust removal eraser, 705-a magnet, 706-a sliding seat, 707-a spiral spring, 708-a cavity, 709-a first piston, 710-a dust falling hole, 8-an auxiliary mechanism, 801-a hollow tube, 802-a threaded rod, 803-a second piston, 804-a flow channel, 9-a supporting unit, 901-a supporting foot, 902-a driving rod, 903-a guide rod, 904-a locking groove, 905-an adjusting seat, 906-a locking rod and 10-a projector body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention, and the present invention is further described with reference to the embodiments below.
Referring to fig. 1-4, in an embodiment of the present application, a lens protection structure for a video projector includes a lens body 1 and a mounting base 3, where the lens body 1 is movably disposed on the mounting base 3, and further includes:
the protective cylinder 2 is arranged on the mounting seat 3, and the lens body 1 is arranged in the protective cylinder 2;
the dust removal sleeve 5 is arranged in the protective cylinder 2 and is connected with the lens body 1; and
the dust removal assembly 7 is arranged on the dust removal sleeve 5 and used for removing dust attached to the lens body 1; wherein
The dust removing assembly 7 includes:
the double-layer lens unit comprises an outer lens 702 and an inner lens 703, the double-layer lens unit is connected with the lens body 1, and a spacing cavity is formed between the outer lens 702 and the inner lens 703;
the sliding seat 706 is movably arranged in the interval cavity, and the sliding seat 706 is attached to the inner wall of the interval cavity in a sealing manner;
the dust removing wiper 704 is in sliding fit with the outer lens 702, and magnets 705 are arranged in the dust removing wiper 704 and the sliding seat 706; and
the driving module is movably arranged on the dust removing sleeve 5 and is used for adjusting the position of the dust removing wiper 704;
a power source for adjusting the position of the lens body 1 is arranged between the lens body 1 and the mounting base 3, and when the power source works and adjusts the lens body 1, the driving module works and controls the dust removing eraser 704 to work.
In a specific case of this embodiment, a clockwork spring 707 is disposed in the dust removing sleeve 5, and a free end of the clockwork spring 707 is connected to the dust removing eraser 704 for assisting the reset operation of the dust removing eraser 704, as shown in fig. 2;
in addition, the power source may adopt a linear motor, an electric cylinder, an air cylinder or the like, as long as the adjustment of the lens position can be realized to perform the focusing work, in this embodiment, the power source is preferably an electric telescopic rod 4, and the electric telescopic rod 4 is connected between the dust removing sleeve 5 and the mounting seat 3.
By arranging the protective barrel 2, the lens body 1 is prevented from being directly exposed in the air and easily corroded by the air, when the projector is used, the dust removal sleeve 5 and the lens body 1 are driven to move relative to the protective barrel 2 by controlling the extension of the electric telescopic rod 4, so that the optimal focusing position is reached, in the process, the driving module and the lens body 1 synchronously move to drive the sliding seat 706 to move downwards along the spacing cavity in the direction shown in fig. 1, and the dust removal eraser 704 is driven to move to clean dust attached to the outer lens 702 along the outer lens 702 under the action of mutual attraction between the magnets 705, so that the phenomenon that the surface of the lens is damaged due to the fact that the dust is attached to the lens for a long time to influence normal projection work is avoided, the automation degree of the whole process is high, and the manual cleaning work of workers is reduced.
Referring to fig. 1 and 2, as a preferred embodiment of the present application, the driving module includes:
the winding wheel 701 is movably arranged on the dust removal sleeve 5, and the winding wheel 701 is in sliding fit with the protection cylinder 2;
the first piston 709 is movably arranged in a cavity 708 formed in the dust removal sleeve 5 and is elastically connected with the cavity 708, the first piston 709 is attached to the inner wall of the cavity 708 in a sealing manner, and the cavity 708 is communicated with the spacing cavity; and
a flexible member connected between the take-up wheel 701 and the first piston 709.
In a specific case of this embodiment, the flexible member may be a belt, a rubber belt, a rope, or the like, and is not particularly limited herein.
In the present embodiment, the dust removing assembly 7 further includes a dust falling hole 710, and the dust falling hole 710 is disposed on the dust removing sleeve 5 and located on the moving path of the dust removing eraser 704;
the protective cylinder 2 is provided with a dust exhaust window 6 matched with the dust falling hole 710.
When the position of the lens body 1 relative to the mounting base 3 is adjusted by extending the electric telescopic rod 4, the winding wheel 701 is driven to rotate under the action of frictional resistance between the winding wheel 701 and the inner wall of the protective cylinder 2, so that the soft piece is wound, at the moment, the first piston 709 is driven to move leftwards along the cavity 708 as shown in fig. 2, the gas in the cavity 708 is squeezed into the spacing cavity, the sliding seat 706 is pushed to move downwards as shown in fig. 1, and the dust removing eraser 704 is driven to move downwards under the action of the magnet 705, so that the dust on the surface of the outer lens 702 is cleaned.
Referring to fig. 3 and 4, as another preferred embodiment of the present application, the present application further includes an auxiliary mechanism 8 disposed on the dust removing sleeve 5 for assisting the dust removing operation of the outer lens 702;
the auxiliary mechanism 8 is connected with the dust removal component 7, and the auxiliary mechanism 8 is controlled to work synchronously when the dust removal component 7 works.
In the present embodiment, the auxiliary mechanism 8 includes a hollow tube 801, a second piston 803, a flow passage 804, and a transmission member;
the hollow pipe 801 is arranged on the dust removing sleeve 5, the flow passage 804 is arranged in the dust removing sleeve 5 and is communicated with the dust falling hole 710, and the hollow pipe 801 is communicated with the flow passage 804;
the second piston 803 is movably arranged in the hollow pipe 801, the second piston 803 is attached to and sealed with the inner wall of the hollow pipe 801, and in addition, the second piston 803 is connected with the dust removing assembly 7 through the transmission piece.
It should be specifically noted that the transmission member is preferably a threaded rod 802, the threaded rod 802 is rotatably installed in the hollow tube 801 and is coaxially and fixedly connected with the winding wheel 701, and the threaded rod 802 is in threaded fit with the second piston 803;
of course, the transmission member is not limited to the above-mentioned mechanical structure, and can also directly adopt a linear motor, an air cylinder or an electric cylinder driving manner, as long as the position of the second piston 803 can be adjusted, which is not listed here.
It should be added that the flow passage 804 and the ash falling hole have an included angle therebetween, preferably 90 °, as shown in fig. 1.
When the winding wheel 701 rotates to wind the soft piece, the threaded rod 802 is driven to rotate, the second piston 803 is driven to move along the hollow pipe 801 under the threaded fit between the threaded rod 802 and the second piston 803, and air in the hollow pipe 801 is squeezed into the flow channel 804, as shown in fig. 1, so that air in the flow channel 804 is sprayed out through the dust falling hole, negative pressure is generated in the dust falling hole, and then under the action of the negative pressure, dust cleaned on the dust cleaning eraser 704 close to the dust falling hole is sucked into the dust falling hole by gravity and is discharged from the dust discharging window 6, the cleaning effect on the dust on the outer lens 702 is further improved, and the dust is prevented from influencing the surface quality of the lens.
Referring to fig. 5 to 7, in an embodiment of the present application, a projector includes a projector body 10 and the lens protection structure, the lens protection structure is disposed on the projector body 10, and further includes a supporting unit 9 disposed on the projector body 10 for supporting the projector body 10;
the projector body 10 is further provided with a groove for accommodating the supporting unit 9.
In a specific case of this embodiment, the number of the supporting units 9 is several groups, and each group of the supporting units 9 includes a supporting foot 901, a driving rod 902, a guide rod 903, an adjusting seat 905 and a locking member;
the supporting foot 901 is movably arranged on the projector body 10, the adjusting seat 905 is movably arranged on the guide rod 903, and the adjusting seat 905 is movably connected with the supporting foot 901 through the driving rod 902;
the locking piece is arranged between the adjusting seat 905 and the guide rod 903 and used for fixing the position of the adjusting seat 905 on the guide rod 903.
It should be specifically noted that the driving rod 902 is hinged between the adjusting seat 905 and the supporting foot 901, the locking member includes a locking rod 906 and a plurality of locking grooves 904, the plurality of locking grooves 904 are disposed on the guide rod 903, the locking rod 906 is movably disposed on the adjusting seat 905 and is elastically connected with the adjusting seat 905;
of course, the locking member may also be fixed by a bolt or a snap structure, which is not listed here.
During practical application, adjust the position of seat 905 through manual regulation for locking pole 906 cooperatees with the locking groove 904 of different positions, through actuating lever 902's effect, makes spike 901 rotate along its articulated department, and then realizes adjusting the height of projector body 10, uses the projector with the convenience under the requirement is put to the difference.
It should be particularly noted that all the elastic connections referred to in this application may adopt a spring, a spring plate, or an elastic steel plate structure, etc., and are not specifically limited herein, and may be selected accordingly according to actual situations.
The working principle of the application is as follows: when the projector is used, the electric telescopic rod 4 is controlled to extend to drive the dust removal sleeve 5 and the lens body 1 to move relative to the protective cylinder 2 so as to reach an optimal focusing position, in the process, under the action of frictional resistance between the winding wheel 701 and the inner wall of the protective cylinder 2, the winding wheel 701 is driven to rotate, so that the soft piece is wound, at the moment, the first piston 709 is driven to move leftwards along the cavity 708 as shown in fig. 2, gas in the cavity 708 is squeezed into the spacing cavity, the sliding seat 706 is pushed downwards as shown in fig. 1, further, under the action of the magnet 705, the dust removal eraser 704 is driven to move downwards, the cleaning work of dust on the surface of the outer lens 702 is realized, the threaded rod 802 is driven to rotate while the soft piece is wound by the rotation of the winding wheel 701, and the second piston 803 is driven to move along the hollow pipe 801 under the threaded fit between the threaded rod 802 and the second piston 803, the air in the hollow pipe 801 is squeezed into the flow passage 804, as shown in fig. 1, so that the air in the flow passage 804 is sprayed out through the dust falling hole, negative pressure is generated in the dust falling hole, and then under the action of the negative pressure, the dust cleaned on the dust removing eraser 704 close to the dust falling hole is sucked into the dust falling hole by attraction and is discharged from the dust discharging window 6, the cleaning effect on the dust on the outer lens 702 is further improved, the dust is prevented from affecting the surface quality of the lens, the locking rod 906 is matched with the locking grooves 904 at different positions by manually adjusting the position of the adjusting seat 905, the supporting foot 901 is rotated along the hinged part through the action of the driving rod 902, and the height of the projector body 10 is further adjusted, so that the projector can be conveniently used under different placement requirements; the automation degree of the whole process is high, and the manual cleaning work of workers is reduced.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A protection structure for lens of film and television projector comprises a lens body and a mounting seat, wherein the lens body is movably arranged on the mounting seat, and the protection structure is characterized by further comprising:
the protective cylinder is arranged on the mounting seat, and the lens body is arranged in the protective cylinder;
the dust removal sleeve is arranged in the protective cylinder and is connected with the lens body; and
the dust removal assembly is arranged on the dust removal sleeve and used for removing dust attached to the lens body; wherein
The dust removal assembly comprises:
the double-layer lens unit comprises an outer lens and an inner lens, the double-layer lens unit is connected with the lens body, and a spacing cavity is formed between the outer lens and the inner lens;
the sliding seat is movably arranged in the interval cavity body, and the sliding seat is attached to and sealed with the inner wall of the interval cavity body;
the dust removing wiper is in sliding fit with the outer lens, and magnets are arranged in the dust removing wiper and the sliding seat; and
the driving module is movably arranged on the dust removing sleeve and is used for adjusting the position of the dust removing wiper;
a power source for adjusting the position of the lens body is arranged between the lens body and the mounting seat, and when the power source works and adjusts the lens body, the driving module works and controls the dust wiper to work;
the driving module includes:
the winding wheel is movably arranged on the dust removal sleeve and is in sliding fit with the protection cylinder;
the first piston is movably arranged in a cavity formed in the dust removal sleeve and is elastically connected with the cavity, the first piston is attached to the inner wall of the cavity in a sealing manner, and the cavity is communicated with the spacing cavity; and
a flexible member connected between the winding wheel and the first piston;
through the structure that sets up the linkage, when the position of adjusting the camera lens body through the power supply is in order to carry out focusing work, drive the coiling wheel under its and the frictional resistance effect between the protective barrel inner wall synchronous rotation, and then carry out the rolling in order to adjust the position of first piston to soft piece, and then realize the work of drive dust removal wipe.
2. A lens protective structure for a video projector as claimed in claim 1, wherein said dust removing assembly further comprises a dust falling hole provided on said dust removing sleeve and located on a moving path of said dust removing wiper;
and the protective cylinder is provided with a dust exhaust window matched with the dust falling hole.
3. A lens protective structure for a projector according to claim 2, further comprising an auxiliary mechanism provided on said dust removing sleeve for assisting a dust removing operation of said outer lens;
the auxiliary mechanism is connected with the dust removal assembly, and the auxiliary mechanism is controlled to work synchronously when the dust removal assembly works.
4. A lens protective structure for a film projector according to claim 3, wherein said auxiliary mechanism includes a hollow tube, a second piston, a flow passage, and a transmission member;
the hollow pipe is arranged on the dust removal sleeve, the flow channel is arranged in the dust removal sleeve and is communicated with the dust falling hole, and the hollow pipe is communicated with the flow channel;
the second piston is movably arranged in the hollow pipe, the second piston is attached to and sealed with the inner wall of the hollow pipe, and in addition, the second piston is connected with the dust removal assembly through the transmission piece.
5. A projector comprising a projector body and the lens protective structure according to any one of claims 1 to 4, the lens protective structure being provided on the projector body, and a support unit provided on the projector body for supporting the projector body;
the projector body is also provided with a groove for accommodating the supporting unit.
6. The projector as claimed in claim 5, wherein the number of the supporting units is several groups, each group of the supporting units comprises a supporting foot, a driving rod, a guide rod, an adjusting seat and a locking piece;
the supporting foot is movably arranged on the projector body, the adjusting seat is movably arranged on the guide rod, and the adjusting seat is movably connected with the supporting foot through the driving rod;
the locking piece is arranged between the adjusting seat and the guide rod and used for fixing the position of the adjusting seat on the guide rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110794170.1A CN113253560B (en) | 2021-07-14 | 2021-07-14 | Protection structure for lens of film and television projector and projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110794170.1A CN113253560B (en) | 2021-07-14 | 2021-07-14 | Protection structure for lens of film and television projector and projector |
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| Publication Number | Publication Date |
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| CN113253560A CN113253560A (en) | 2021-08-13 |
| CN113253560B true CN113253560B (en) | 2021-09-28 |
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| CN213186301U (en) * | 2020-10-27 | 2021-05-11 | 沈阳鑫松科技有限公司 | Law enforcement record appearance that shooting definition is high |
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