CN216595862U

CN216595862U - Lens protection device and projector

Info

Publication number: CN216595862U
Application number: CN202122751953.XU
Authority: CN
Inventors: 林祖武; 王百胜; 肖坚石
Original assignee: Zhuhai Jinpin Venture Sharing Platform Technology Co Ltd
Current assignee: Zhuhai Jinpin Venture Sharing Platform Technology Co Ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-05-24
Anticipated expiration: 2031-11-10

Abstract

The utility model provides a lens protection device which is arranged on the inner side of a shell of a projector and in front of an optical lens of the projector, and comprises a vertical plate, a lens cover and a driving part, wherein the vertical plate is fixed in the shell and provided with a through hole, the lens cover is arranged on one side of the vertical plate, the driving part is arranged on the other side of the vertical plate, the lens cover comprises a first cover plate and a second cover plate which are arranged in a bilateral symmetry mode, and the first cover plate and the second cover plate can open or close the through hole through rotation. The lens protection device provided by the utility model drives the lens cover to rotate relative to the vertical plate through the driving part, the through hole on the vertical plate is opened or closed by utilizing the rotation of the lens cover, and the lens cover seals the through hole of the vertical plate under the non-working state of the projector, so that the optical lens of the projector can be effectively prevented from being stained with dust under the non-working state, the damage of the external part to the optical lens is effectively prevented, and the function of protecting the optical lens in the projector is achieved. The utility model also provides a projector.

Description

Lens protection device and projector

Technical Field

The utility model relates to the technical field of projectors, in particular to a lens protection device and a projector.

Background

With the continuous improvement of living standard of people, more and more personalized demands are gradually derived. More people now like to use projectors as display devices for viewing, living and learning, which makes the products of projectors more and more upgraded. However, the existing projectors generally adopt an optical lens to realize an imaging function. The quality of the optical lens directly determines the using effect and the impression experience of the projector. If the optical lens of the projector is scratched or dusted, the use experience of using the projector is directly affected. The existing projector is generally protected only by arranging a protective cover, and the protective cover needs to be manually opened and closed on one hand, and on the other hand, if the user forgets to open the protective cover during use, a picture cannot be displayed, so that bad experience of the user is easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects that a protective cover used for an optical lens on the existing projector needs to be manually opened and closed, and if the protective cover is forgotten to be opened during use, bad experience of a user is easily caused, and provides a lens protection device.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a lens protection device is arranged on the inner side of a shell of a projector and is positioned in front of an optical lens of the projector, and comprises a vertical plate, a lens cover and a driving part, wherein the vertical plate is fixed in the shell and is provided with a through hole through which light rays emitted by the optical lens can pass, the lens cover is arranged on one side, away from the optical lens, of the vertical plate, the driving part is arranged on the other side of the vertical plate and is used for driving the lens cover to rotate, the lens cover comprises a first cover plate and a second cover plate which are arranged in a bilateral symmetry mode, and the first cover plate and the second cover plate can open or close the through hole through rotation.

Furthermore, the first cover plate comprises a first connecting part movably connected with the vertical plate, the second cover plate comprises a second connecting part movably connected with the vertical plate, and the first cover plate and the second cover plate are in transmission connection through the first connecting part and the second connecting part.

Specifically, be provided with on the riser and supply first apron articulated erection column, be provided with first connecting hole on the first connecting portion of first apron, first retaining member passes first connecting hole articulate in on the erection column.

Specifically, a first mounting hole through which a driving shaft of the driving part can penetrate is formed in the vertical plate, a second connecting hole is formed in a second connecting portion of the second cover plate, and the second locking piece penetrates through the second connecting hole and is locked on the driving shaft.

Specifically, the vertical plate is further provided with a pair of second mounting holes for fixing the driving part, and the pair of second mounting holes are located on two sides of the first mounting hole.

Specifically, the first connecting portion is provided with a first meshing tooth, the second connecting portion is provided with a second meshing tooth meshed with the first meshing tooth, and the first cover plate and the second cover plate are in meshing transmission through the first meshing tooth and the second meshing tooth.

Furthermore, the first cover plate also comprises a first semicircular base plate which can cover the through hole, the first semicircular base plate is provided with a first arc side edge and a first straight line side edge, and a first step surface is formed on the first straight line side edge; the second cover plate further comprises a second semicircular base plate capable of covering the through hole, the second semicircular base plate comprises a second arc side edge and a second straight line side edge, and a second step surface capable of being abutted to the first step surface is formed on the second straight line side edge.

Specifically, when the first cover plate and the second cover plate are closed, the first step surface and the second step surface are clamped with each other.

Furthermore, a first limiting part for limiting the rotation angle of the first cover plate and a second limiting part for limiting the rotation angle of the second cover plate are further arranged on the vertical plate.

The lens protection device provided by the utility model has the beneficial effects that: including the riser, lens cap and driver part, it is rotatory for the riser to drive the lens cap through driver part, utilize the rotation of lens cap and open or close the through-hole that is located the riser, adopt the biplate formula structure that opens and shuts, overall structure is simple, it is firm reliable, under the non-operating condition of projecting apparatus, the through-hole of riser is sealed to this lens cap, thereby can prevent effectively that the optical lens of projecting apparatus from staining the dust under the non-operating condition, the periodic maintenance time of extension optical lens, can also prevent outside damage to optical lens effectively, avoid the fish tail of other parts in the external world to the camera lens, play the effect of optical lens in the protection projecting apparatus.

The utility model also provides a projector which comprises a shell, an optical lens and a control panel, wherein the optical lens and the control panel are arranged in the shell, the lens protection device is arranged in the shell, and a driving part of the lens protection device is electrically connected with the control panel.

The projector provided by the utility model has the beneficial effects that: the lens protection device is provided, the driving part is electrically connected with the control panel of the projector, so that the lens cover can automatically open the through hole along with the startup of the projector and can also close the through hole along with the shutdown of the projector, and the projector can realize the effective protection of the optical lens in the shell because of the lens protection device.

Drawings

FIG. 1 is a schematic perspective exploded view of a projector according to the present invention;

fig. 2 is a schematic perspective view of a lens protection apparatus provided in the present invention;

fig. 3 is a schematic perspective view of a vertical plate in the lens protection apparatus provided in the present invention;

fig. 4 is a schematic perspective view of a driving part in the lens protection apparatus according to the present invention;

fig. 5 is a schematic perspective view of a first cover plate in the lens protection apparatus according to the present invention;

fig. 6 is a schematic perspective view of a second cover plate in the lens protection apparatus provided in the present invention.

In the figure: 100-lens protection device;

10-vertical plate, 11-through hole, 12-mounting column, 13-first mounting hole, 14-second mounting hole, 15-first limiting part and 16-second limiting part;

20-lens cover, 21-first cover plate, 211-first connecting part, 2111-first connecting hole, 2112-first engaging tooth, 212-first semicircular base plate, 2121-first circular arc side edge, 2122-first straight side edge, 2122 a-first step surface, 22-second cover plate, 221-second connecting part, 2211-second connecting hole, 2212-second engaging tooth, 222-second semicircular base plate, 2221-second circular arc side edge, 2222-second straight side edge and 2222 a-second step surface;

30-drive part, 31-drive shaft, 311-threaded hole, 32-lug;

200-projector, 201-housing, 202-optical lens, 203-control panel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1 to 6, a lens protection device 100 according to the present invention is provided. The lens protection device 100 provided by the utility model is mainly applied to the projector 200, is used for effectively protecting the optical lens 202 in the projector 200, is synchronously opened when the projector 200 is opened, and is synchronously closed when the projector 200 is closed, and the lens protection device 100 realizes automatic opening and closing of a projection area in front of the optical lens 202, so that the projector 200 can be effectively protected in a non-working state, dust is prevented from entering the optical lens 202, and meanwhile, the damage of an external environment to the optical lens 202 in the non-working state is also avoided.

As shown in fig. 1, there is provided an exploded view of a lens protection apparatus 100 disposed in a projector 200. The lens protection device 100 provided by the utility model is arranged inside a shell 201 of a projector 200 and is positioned in front of an optical lens 202 of the projector 200.

Fig. 2 is a schematic perspective view of a lens protection apparatus 100 according to the present invention. The lens protection device 100 provided by the utility model comprises an upright plate 10 which is fixed in a shell 201 and is provided with a through hole 11 for light rays emitted by an optical lens 202 to pass through, a lens cover 20 which is arranged on one side of the upright plate 10 far away from the optical lens 202, and a driving part 30 which is arranged on the other side of the upright plate 10 and is used for driving the lens cover 20 to rotate. In the lens protection device 100 provided by the present invention, the vertical plate 10 is fixed in front of the optical lens 202 of the projector 200, the vertical plate 10 is formed by bending a sheet metal part, the top of the vertical plate 10 has a first bending edge fixedly connected with the top shell of the housing 201 of the projector 200, and the bottom of the vertical plate 10 has a second bending edge abutted against the bottom shell of the housing 201 of the projector 200. The first bending edge is provided with an installation hole, and the vertical plate 10 can be fixed on the top shell of the shell 201 of the projector 200 through screws, rivets, glue dispensing, welding and the like. The vertical area of the riser 10 is provided with a through hole 11 through which the light emitted by the optical lens 202 can pass, the aperture of the through hole 11 is larger than the size of the optical lens 202, and when the riser 10 is installed, the riser 10 needs to be installed as close as possible to the optical lens 202, but a reasonable gap needs to be kept between the riser 10 and the optical lens 202, so as to ensure that the lens protection device 100 provided by the present invention does not unnecessarily touch or scratch the optical lens 202. The lens cover 20 disposed on one side of the vertical plate 10 is used for opening or closing the through hole 11 on the vertical plate 10. And in order to ensure that the lens cover 20 does not touch the optical lens 202, the lens cover 20 is disposed on a side surface of the vertical plate 10 away from the optical lens 202. The driving unit 30 disposed at the other side of the vertical plate 10 is used for automatically driving the movement of the lens cover 20 at one side of the vertical plate 10. In the present embodiment, the driving member 30 is a 5V four-phase stepping motor, and the rotation of the lens cap 20 on the side of the upright plate 20 is driven by the rotation of the motor. And the driving software matched with the driving component 30 can solve the problem that the closed state value of the lens cover 20 is taken as the original point, and the motor is controlled to rotate to limit the steps so as to achieve the accurate limit of the opening and closing of the lens cover.

Further, as shown in fig. 2, in the lens protection apparatus 100 of the present invention, the lens cover 20 located at one side of the vertical plate 10 is of a two-piece design, and can be automatically turned on and off along with the turning on and off of the projector 200. The lens cover 20 includes a first cover plate 21 and a second cover plate 22 symmetrically disposed at left and right sides, and the first cover plate 21 and the second cover plate 22 can open or close the through hole 11 by rotating. In the present embodiment, the through hole 11 on the vertical plate 10 is a circular through hole with a similar profile to the optical lens 202, and correspondingly, the first cover plate 21 and the second cover plate 22 in the lens cover 20 form a circular cover plate with a similar profile to the circular through hole when closed. The first cover plate 21 and the second cover plate 22 are arranged in bilateral symmetry, and when the first cover plate 21 and the second cover plate 22 are opened, the first cover plate 21 and the second cover plate 22 rotate to the left and the right along the central line, so that the area of the through hole 11 on the vertical plate 10 is opened, and light emitted by the optical lens 202 can pass through the through hole 11 of the vertical plate 10. The end of the first cover plate 21 of the lens cover 20, which is located at the bottom of the through hole 11, is hinged to the upright plate 10, so that the end of the first cover plate 21, which is located at the top of the through hole 11, can rotate towards the right side of the upright plate 10 with the opening of the projector 200, and can also rotate towards the center of the upright plate 10 with the closing of the projector 200. Similarly, one end of the second cover 22 of the lens cover 20, which is located at the bottom of the through hole 11, is hinged to the upright 10, so that the end of the second cover 22, which is located at the top of the through hole 11, can rotate toward the left side of the upright 10 with opening, and can also rotate toward the center of the upright 10 with closing of the projector 200. And the first cover plate 21 and the second cover plate 22 of the lens cover 20 are operated synchronously on one side of the vertical plate 10, that is, both can rotate towards both sides of the vertical plate 10 at the same time so as to open the through hole 11, or rotate towards the center of the vertical plate 10 at the same time so as to close the through hole 11.

Further, as shown in fig. 5, a schematic perspective view of the first cover plate 21 of the lens cover 20 provided by the present invention is shown. The first cover plate 21 of the lens cover 20 provided by the present invention includes a first connecting portion 211 movably connected to the vertical plate 10, and the first connecting portion 211 is disposed at the bottom of the first cover plate 21. Fig. 6 is a schematic perspective view of the second cover plate 22 of the lens cover 20 according to the present invention. The second cover plate 22 of the lens cover 20 provided by the present invention includes a second connecting portion 221 movably connected with the vertical plate 10, and the second connecting portion 221 is disposed at the bottom of the second cover plate 22. As shown in fig. 2, the first cover plate 21 and the second cover plate 22 of the lens cover 20 are drivingly connected by a first connecting portion 211 and a second connecting portion 221. The first cover plate 21 of the lens cover 20 is connected to the vertical plate 10 through the first connection portion 211, and is also connected to the second cover plate 22 in a transmission manner. The second connecting portion 221 of the second cover plate 22 of the lens cover 20 is not only in transmission connection with the first cover plate 21, but also is fixedly connected with the driving component 30, so as to realize the movement of the first cover plate 21 driven by the driving component 30, and the second cover plate 22 also needs to be movably connected with the vertical plate 10, so as to ensure that the second cover plate 22 can be always attached to the side surface of the vertical plate 10 to rotate during the movement.

Specifically, as shown in fig. 3, the riser 10 of the lens protection apparatus 100 provided by the present invention is provided with a mounting post 12 for the first cover 21 to hinge. As shown in fig. 5, the first connection portion 211 of the first cover plate 21 of the lens cover 20 of the present invention is provided with a first connection hole 2111, and the first locking member is hinged to the mounting post 12 through the first connection hole 2111. The center of the mounting post 12 is provided with a threaded hole for fixing a locking piece. The first connection holes 2111 formed in the first connection portion 211 of the first cover plate 21 are sleeved on the outer circumferential surface of the mounting post 12, and the relative position of the first cover plate 21 in the axial direction of the mounting post 12 is defined by a connection member such as a bolt, a screw, etc., so that the first cover plate 21 can rotate along the axial direction of the mounting post 12, and during the rotation of the first cover plate 21, the top of the first cover plate 21 can rotate around the mounting post 12 toward two sides of the column 20.

Specifically, as shown in fig. 3, the vertical plate 10 of the lens protection apparatus 100 of the present invention is provided with a first mounting hole 13 through which the driving shaft 31 of the driving member 30 can pass. Fig. 4 is a schematic perspective view of a driving part 30 of a lens protection apparatus 100 according to the present invention. The driving part 30 in the lens protection apparatus 100 provided by the present invention is a stepping motor, one end of which is provided with a driving shaft 31, and a screw hole for fixing connection is provided at the center of the driving shaft 31, and both sides of which are provided with lugs 32 for fixing. As shown in fig. 1, the driving member 30 is disposed on the side of the vertical plate 10 close to the optical lens 202, so that during installation, only the driving shaft 31 of the driving member 30 needs to be inserted into the first installation hole 13 of the vertical plate 10, and then the second cover 22 is fixed on the driving shaft 31 of the driving member 30, so that the driving member 30 can drive the second cover 22 to move. As shown in fig. 6, the second connecting portion 221 of the second cover plate 22 of the lens cover 20 of the present invention is provided with a second connecting hole 14, and the second locking member passes through the second connecting hole 14 and is locked on the driving shaft 31. The second connecting hole 14 of the second cover plate 22 is sleeved on the driving shaft 31 of the driving part 30, and the relative position of the second cover plate 22 in the axial direction of the driving shaft 31 is limited by the locking part, so that the second cover plate 22 is driven by the rotation of the driving shaft 31 to be attached to the side surface of the vertical plate 10 at one side of the vertical plate 10 to rotate.

Specifically, as shown in fig. 3, the riser 10 of the lens protection apparatus 100 is further provided with a pair of second mounting holes 14 for fixing the driving member 30, and the pair of second mounting holes 14 are located at both sides of the first mounting hole 13. The second mounting hole 14 of the vertical plate 10 is used for fixing the driving part 30. In this embodiment, the lugs 32 on both sides of the stepping motor are provided with connecting holes, and can be fixed to the second mounting hole 14 of the vertical plate 10 through the connecting holes of the lugs 32 by locking members such as screws, rivets, pins, etc., so as to realize the relative fixation between the driving member 30 and the vertical plate 10. Meanwhile, the relative position of the second cover plate 22 on the other side of the vertical plate 10 is secured while the driving part 30 is fixed.

Specifically, as shown in fig. 2, 5 and 6, the lens cover 20 of the present invention has a two-piece design, in which the first cover plate 21 and the second cover plate 22 are in transmission connection with each other. The first connecting portion 211 of the first cover 21 is provided with a first engaging tooth 2112, the second connecting portion 221 of the second cover 22 is provided with a second engaging tooth 2212 engaged with the first engaging tooth 2112, and the first cover 21 and the second cover 22 are driven by the first engaging tooth 2112 and the second engaging tooth 2212. The first cover 21 has a first engaging tooth 2112 on the outer circumferential surface of the first connecting portion 211, and a second engaging tooth 2212 on the outer circumferential surface of the second connecting portion 221, and the first engaging tooth 2112 and the second engaging tooth 2212 have identical structures, pitches, and tooth profiles, so that when the second cover 22 rotates along with the driving member 30, the second engaging tooth 2212 drives the first cover 21 to rotate along with the second cover through gear transmission. And the first cover plate 21 and the second cover plate 22 are meshed through gears, so that synchronous and reverse rotation of the two can be realized.

Further, as shown in fig. 5, the first cover plate 21 of the lens cover 20 of the present invention further includes a first semicircular base plate 212 capable of covering the through hole 11, the first semicircular base plate 212 is provided with a first circular arc side edge 2121 and a first straight side edge 2122, and a first step surface 2122a is formed on the first straight side edge 2122. As shown in fig. 6, the second cover plate 22 of the lens cover 20 further includes a second semicircular base plate 222 capable of covering the through hole 11, the second semicircular base plate 222 includes a second circular arc side 2221 and a second straight side 2222, and a second step surface 2222a capable of abutting against the first step surface 2122a is formed on the second straight side 2222. The first linear side 2122 of the first semicircular substrate 212 and the second linear side 2222 of the second semicircular substrate 222 can completely overlap when the first cover plate 21 and the second cover plate 22 are closed, so that when the first cover plate 21 and the second cover plate 22 are closed, the first step surface 2122a of the first cover plate 21 and the second step surface 2222a of the second cover plate 22 are engaged with each other, thereby ensuring that when the first cover plate 21 and the second cover plate 22 are closed, the contacting sides can be completely closed together.

Further, as shown in fig. 2, the vertical plate 10 of the lens protection cover 100 is further provided with a first limiting portion 15 for limiting the rotation angle of the first cover 21 and a second limiting portion 16 for limiting the rotation angle of the second cover 22. The first position-limiting portion 15 is disposed on the vertical plate 10 near the edge of the first cover plate 21. The second position-limiting portion 16 is disposed at the edge of the vertical plate 10 close to the second cover plate 22. In this embodiment, the first position-limiting portion 15 and the second position-limiting portion 16 are two mounting holes for fixing the locking member, and the relative position-limiting effect can be achieved by fixing the locking member at the mounting holes by screws, pins, rivets, bolts, etc. When the first cover plate 21 rotates to the first position-limiting portion 15 toward the edge of the vertical plate 10, the first cover plate 21 can be limited by the first position-limiting portion 15 from continuing to rotate toward the outer side of the vertical plate 10, so as to limit the maximum distance that the first cover plate 21 can rotate outward. Similarly, when the second cover 22 rotates to the second position-limiting portion 16 toward the edge of the vertical plate 10, the second position-limiting portion 16 can limit the maximum distance that the second cover 22 can rotate outward, and the first position-limiting portion 15 and the second position-limiting portion 16 can achieve the mechanical position-limiting of the lens cover 20.

The lens protection device 100 provided by the utility model comprises an upright plate 10, a lens cover 20 and a driving part 30, wherein the driving part 30 drives the lens cover 20 to rotate relative to the upright plate 10, the through hole 11 on the upright plate 10 is opened or closed by utilizing the rotation of the lens cover 20, and the lens cover 20 closes the through hole 11 of the upright plate 10 in the non-working state of the projector 200, and adopts a two-piece type opening and closing structure, so that the whole structure is simple, firm and reliable, the optical lens 202 of the projector 200 can be effectively prevented from being stained with dust in the non-working state, the regular maintenance time of the optical lens 202 is prolonged, the damage of the external part to the optical lens 202 can be effectively prevented, the lens can be prevented from being scratched by other external parts, and the function of protecting the optical lens 202 in the projector 200 can be achieved.

Fig. 1 is an exploded view of a projector 200 according to the present invention. The utility model further provides a projector 200, which comprises a housing 201, an optical lens 202 and a control board 203, wherein the optical lens 202 and the control board 203 are arranged in the housing 201, the lens protection device 100 is arranged in the housing 201, and a driving part 30 of the lens protection device 100 is electrically connected with the control board 203. The driving part 30 of the lens protection device 100 is electrically connected to the control board 203 of the projector 200, so that not only the driving part 30 can be supplied with electric power by the power supply of the projector 200, but also the synchronous control of the projector 200 and the lens protection device 100 can be realized by the control board 203. That is, when the projector 200 is turned on, the lens protection device 100 is synchronously turned on, and when the projector 200 is turned off, the lens protection device 100 can be synchronously turned off, thereby realizing synchronous control between the lens protection device 100 and the projector 200.

The projector 200 provided by the present invention has the lens protection device 100, and the driving component 30 is electrically connected to the control board of the projector 200, so that the lens cover 20 can automatically open the through hole 11 with the startup of the projector 200, and can also close the through hole 11 with the shutdown of the projector, and the projector 200 can realize effective protection for the optical lens 202 inside the housing 201 because of the lens protection device 100.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The lens protection device is characterized by comprising a vertical plate, a lens cover and a driving part, wherein the vertical plate is fixed in the shell and provided with a through hole through which light rays emitted by the optical lens can pass, the lens cover is arranged on one side, away from the optical lens, of the vertical plate, the driving part is arranged on the other side of the vertical plate and used for driving the lens cover to rotate, the lens cover comprises a first cover plate and a second cover plate which are arranged in a bilateral symmetry mode, and the through hole can be opened or closed through rotation of the first cover plate and the second cover plate.

2. A lens protection device as claimed in claim 1, wherein said first cover plate includes a first connecting portion movably connected to said vertical plate, said second cover plate includes a second connecting portion movably connected to said vertical plate, and said first cover plate and said second cover plate are in transmission connection through said first connecting portion and said second connecting portion.

3. A lens protection device as claimed in claim 2, wherein the vertical plate is provided with a mounting post for the first cover to hinge, the first connecting portion of the first cover is provided with a first connecting hole, and the first locking member is hinged to the mounting post through the first connecting hole.

4. A lens protection device as claimed in claim 2, wherein the vertical plate has a first mounting hole for a driving shaft of the driving member to pass through, the second connecting portion of the second cover plate has a second connecting hole, and the second locking member passes through the second connecting hole and is locked to the driving shaft.

5. A lens protector according to claim 4, wherein a pair of second mounting holes is provided on the vertical plate for fixing the driving member, and a pair of the second mounting holes is located on both sides of the first mounting hole.

6. A lens protection apparatus according to claim 2, wherein the first connecting portion is provided with a first engaging tooth, the second connecting portion is provided with a second engaging tooth which is engaged with the first engaging tooth, and the first cover plate and the second cover plate are driven by the first engaging tooth and the second engaging tooth.

7. The lens protection device as claimed in claim 2, wherein said first cover plate further comprises a first semicircular base plate covering said through hole, said first semicircular base plate having a first circular arc side and a first straight side, a first step surface being formed on said first straight side; the second cover plate further comprises a second semicircular base plate capable of covering the through hole, the second semicircular base plate comprises a second arc side edge and a second straight line side edge, and a second step surface capable of being abutted to the first step surface is formed on the second straight line side edge.

8. A lens protection device as claimed in claim 7, wherein said first step surface and said second step surface are engaged with each other when said first cover plate and said second cover plate are closed.

9. A lens protection device as claimed in claim 1, wherein the riser is further provided with a first position-limiting portion for limiting the rotation angle of the first cover plate and a second position-limiting portion for limiting the rotation angle of the second cover plate.

10. A projector comprising a housing, an optical lens and a control board disposed in the housing, and a lens protection device according to any one of claims 1 to 9 disposed in the housing, wherein a driving part of the lens protection device is electrically connected to the control board.