CN110809144B

CN110809144B - Projection device

Info

Publication number: CN110809144B
Application number: CN201910947980.9A
Authority: CN
Inventors: 许长征; 胡震宇; 黄日东
Original assignee: Shenzhen Huole Science and Technology Development Co Ltd
Current assignee: Shenzhen Huole Science and Technology Development Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2021-06-29
Anticipated expiration: 2039-09-30
Also published as: CN110809144A

Abstract

The invention provides projection equipment which comprises a base, a support, a transmission assembly, an operating piece and a projector, wherein the support is arranged on the base, the transmission assembly is arranged on the support so as to enable the support to support the transmission assembly, and the transmission assembly is connected between the operating piece and the projector so as to enable the operating piece and the projector to be suspended in the air relative to the base and respectively arranged on two opposite sides of the support; the projector comprises a shell and a projection lens, wherein part of the projection lens is arranged in the shell, one part of the projection lens is exposed out of the shell through a through hole in the shell, the optical axis direction of the projection lens is intersected or perpendicular to the arrangement direction of an operating piece, a support and the projector, and when the operating piece rotates around the arrangement direction, the transmission assembly drives the projector to rotate around the arrangement direction, so that the projection direction or the projection area of the projector is changed. The invention provides a projection device which can conveniently adjust the projection direction and the projection area of the projection device.

Description

Projection device

Technical Field

The invention relates to the technical field of electronics, in particular to projection equipment.

Background

When the projection direction and the projection angle of the existing projection equipment are adjusted, the position of the projection equipment needs to be changed. However, when the projection apparatus is fixed to a wall surface, it is inconvenient to project the display screen to a different direction or area. Therefore, how to conveniently adjust the projection direction and the projection area of the projection device becomes a problem to be solved.

Disclosure of Invention

The invention provides a projection device which can conveniently adjust the projection direction and the projection area of the projection device.

The invention provides projection equipment which comprises a base, a support, a transmission assembly, an operating part and a projector, wherein the support is arranged on the base, the transmission assembly is arranged on the support so as to enable the support to support the transmission assembly, and the transmission assembly is connected between the operating part and the projector so as to enable the operating part and the projector to be suspended relative to the base and respectively arranged at two opposite sides of the support; the projector comprises a shell and a projection lens, wherein the projection lens is arranged in the shell, one part of the projection lens passes through a through hole in the shell and is exposed out of the shell, the optical axis direction of the projection lens is intersected or perpendicular to the operating piece, the support and the arrangement direction of the projector, and when the operating piece rotates around the arrangement direction, the transmission assembly drives the projector to rotate around the arrangement direction so as to change the projection direction or the projection area of the projector.

In an embodiment, the transmission assembly includes drive gear, transmission shaft and transfer line that connects gradually, the transmission shaft is followed the array orientation runs through the support, drive gear with the operating part is located same one side and interconnect of support, the transmission shaft with the projector is located same one side of support, the one end of transfer line is connected the transmission shaft, the other end is connected the projector, the extending direction of transfer line with the extending direction of transmission shaft is crossing, works as the operating part drives drive gear winds when the array orientation rotates, drive gear drives the transmission shaft winds the array orientation rotates, the transmission shaft drives the transmission line winds the array orientation rotates, and then drives the projector winds the array orientation rotates.

In one embodiment, the transmission gear includes a first gear and a second gear that are engaged with each other, the first gear is coaxially connected to the operating member, and the second gear is coaxially connected to an end of the transmission shaft that is away from the transmission rod.

In one embodiment, the radius of the first gear is smaller than the radius of the second gear.

In one embodiment, a surface of the holder facing the first gear is provided with a locking piece, the locking piece and the first gear can approach or separate from each other along the arrangement direction, and when the locking piece is arranged between two adjacent convex teeth of the first gear, the first gear is locked by the locking piece; when the locking member is provided outside the first gear, the first gear can rotate with the operating member.

In one embodiment, a surface of the bracket facing the first gear is further provided with a protruding shaft, the protruding shaft is arranged in a shaft hole of the first gear, the first gear can rotate around the protruding shaft and slide along the protruding shaft, and when the first gear approaches the bracket along the protruding shaft, the clamping fastener can be arranged between two adjacent protruding teeth of the first gear; when the first gear is far away from the bracket along the convex shaft, the clamping stop piece is arranged outside the first gear.

In one embodiment, the engaging member is inserted through the holder in the arrangement direction and is capable of extending and contracting relative to the holder, and when the engaging member is close to the first gear, the engaging member is capable of being provided between two adjacent teeth of the first gear; when the clamping part is far away from the first gear, the clamping part is arranged outside the first gear.

In an embodiment, the surface of the first gear facing the bracket is provided with at least one engaging member, the bracket is provided with a slot matched with the at least one engaging member, and when the first gear is close to the bracket under the action of the operating member, the at least one engaging member is engaged with the slot.

In an embodiment, the at least one engaging member is annular and arranged around a geometric center of the first gear, and the engaging groove is annular.

In one embodiment, a sliding groove is formed in the base, a sliding rail is arranged on the bottom surface of the support, the sliding rail is clamped in the sliding groove and is connected with the sliding groove of the base in a sliding mode, and the sliding rail is annular or arc-shaped, so that the support drives the projector to rotate relative to the base.

The driving component and the operating component are connected with the projector, and the operating component drives the driving component to rotate so as to drive the projector to rotate, so that the direction of a projection lens of the projector can be adjusted under the condition that the whole projection equipment is not moved, and the operation is simple and convenient; support drive assembly and make operating parts and the unsettled setting of projector through the support, and then make operating parts and projector have the motion space, locate the both sides of support respectively with operating parts and projector to make the motion space of operating parts and projector keep apart each other, and can rationally carry out structural design to projection equipment, make projection equipment complete machine miniaturized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention;

FIG. 2 is an exploded view of a projection device provided by an embodiment of the present invention;

FIG. 3 is a side view of a projection device provided by an embodiment of the invention;

FIG. 4 is a front view of a projection device in a state provided by an embodiment of the present invention;

FIG. 5 is a front view of a projection apparatus provided in an embodiment of the present invention in a rotatable state;

fig. 6 is a cross-sectional view of a projection device in a locked state according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view of another projection device provided in accordance with an embodiment of the present invention in a locked state;

FIG. 8 is a schematic view of a gear and carrier assembly according to an embodiment of the present invention;

FIG. 9 is a schematic view of a gear and a bracket mounted together according to an embodiment of the present invention;

FIG. 10 is a side view of a bracket according to an embodiment of the present invention;

FIG. 11 is a disassembled view of a bracket and a base according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a bottom surface of a bracket according to an embodiment of the present invention.

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. The embodiments of the present invention can be combined with each other as appropriate.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention. For convenience of description, the first viewing angle of the projection apparatus 100 is defined as a reference, the width direction of the projection apparatus 100 is defined as an X direction, the length direction of the projection apparatus 100 is defined as a Y direction, and the height direction of the projection apparatus 100 is defined as a Z direction.

Referring to fig. 1, an embodiment of the invention provides a projection apparatus 100. It will be appreciated that the projection device 100 may be a miniature, portable projector. The projection device 100 includes a base 1, a bracket 2, a transmission assembly 3, an operation member 4, and a projector 5. The base 1 is intended to be placed on a table top to ensure a stable placement of the projection device 100.

Referring to fig. 1 and 2, the support 2 is disposed on the base 1. The transmission assembly 3 is mounted on the bracket 2, so that the bracket 2 supports the transmission assembly 3. The transmission assembly 3 is connected between the operating part 4 and the projector 5, so that the operating part 4 and the projector 5 are suspended relative to the base 1 and are respectively arranged on two opposite sides of the bracket 2. In other words, the operating element 4 is provided on one side of the bracket 2, and the projector 5 is provided on the other side of the bracket 2. Therefore, one side of the bracket 2 provides a movement space for the operating part 4, the other side of the bracket 2 provides a rotation space for the projector 5, and the bracket 2 isolates the spaces on the two sides from each other, so that the movement space occupied by the projector 5 and the operating part 4 is effectively reduced when the projector 5 and the operating part 4 are arranged on the same side. Furthermore, the operating element 4, the projector 5 and the bracket 2 are arranged laterally to make the projection apparatus 100 more stable.

Referring to fig. 1 and fig. 2, the projector 5 includes a housing 51 and a projection lens 52 partially disposed in the housing 51. A part of the projection lens 52 is exposed out of the housing 51 through a through hole in the housing 51. The optical axis direction of the projection lens 52 intersects or is perpendicular to the arrangement direction of the operating element 4, the bracket 2, and the projector 5. The optical axis direction of the projection lens 52 is a direction parallel to the central axis of the lens of the projection lens 52. When the operating part 4 rotates around the arrangement direction, the transmission component 3 drives the projector 5 to rotate around the arrangement direction, so that the projection direction or the projection area of the projector 5 is changed.

Specifically, the arrangement direction is a Y-axis direction. The transmission assembly 3 drives the projector 5 to rotate around the Y-axis direction, so that the projection lens 52 of the projector 5 moves around the Y-axis. In this way, the projection screen of the projector 5 in front can move up and down along the Z-axis direction, and the direction of the projection lens 52 of the projector can be adjusted without moving the whole projection apparatus 100.

The driving component 3 and the operating component 4 are connected with the projector 5, the driving component 3 is driven to rotate through the operating component 4, so that the projector 5 is driven to rotate, the direction of a projection lens 52 of the projector is adjusted under the condition that the whole projection equipment 100 is not moved, the operation is simple and convenient, the driving component 3 is supported by the support 2, the operating component 4 and the projector 5 are arranged in a suspended mode, and the operating component 4 and the projector 5 have a movement space; the operating element 4 and the projector 5 are respectively arranged on two sides of the bracket 2, so that the moving spaces of the operating element 4 and the projector 5 are isolated from each other, the structural design of the projection device 100 can be reasonably carried out, and the whole projection device 100 is miniaturized.

Referring to fig. 1 and 2, the transmission assembly 3 includes a transmission gear 31, a transmission shaft 32 and a transmission rod 33, which are connected in sequence. The transmission shaft 32 penetrates the holder 2 in the arrangement direction. The transmission gear 31 and the operation part 4 are arranged on the same side of the bracket 2 and are connected with each other. The transmission rod 33 and the projector 5 are arranged on the same side of the bracket 2. One end of the transmission rod 33 is connected with the transmission shaft 32, and the other end is connected with the projector 5. The direction of extension of the transmission rod 33 intersects the direction of extension of the transmission shaft 32. When the operating element 4 drives the transmission gear 31 to rotate around the arrangement direction, the transmission gear 31 drives the transmission shaft 32 to rotate around the arrangement direction. The transmission shaft 32 drives the transmission rod 33 to rotate around the arrangement direction, and further drives the projector 5 to rotate around the arrangement direction.

Specifically, referring to fig. 1 and 2, the bracket 2 may include a bracket bottom plate 21 and a supporting plate 22 integrally interconnected with the bracket bottom plate 21. The support bottom plate 21 is arranged on the base 1, and the plane of the support plate 22 is perpendicular or approximately perpendicular to the plane of the support bottom plate 21. In other words, the support plate 22 extends from the bracket bottom plate 21 in the Z-axis direction. A drive shaft 32 extends through the support plate 22 in the Y-axis direction. The transmission gear 31 is connected to one end of the transmission shaft 32, and the transmission gear 31 is further connected to the operating part 4. The transmission gear 31 is disposed substantially parallel to the supporting plate. The operating element 4 drives the transmission gear 31 to rotate, and the transmission gear 31 drives the transmission shaft 32 to rotate, so as to drive the transmission rod 33 arranged on the other side of the support plate 22 to rotate. The extending direction of the transmission rod 33 may be substantially perpendicular to the extending direction of the transmission shaft 32, and the projector 5 is disposed at one end of the transmission rod 33 far away from the transmission shaft 32. When the transmission rod 33 rotates around the Y-axis direction, the projector 5 is driven by the transmission rod 33 to rotate around the Y-axis. Generally speaking, the optical axis direction of the projector 5 is along the X-axis direction, and the projector 5 can drive the projector 5 to lift upwards (the direction opposite to the base 1) or downwards (the direction close to the base 1) around the transmission shaft 32 under the driving of the transmission rod 33, so that the display picture presented by the wall surface or the curtain in front of the projector 5 moves upwards or downwards, and further the projection direction or the projection area of the projector 5 is adjusted.

Referring to fig. 1 and 2, the transmission gear 31 includes a first gear 311 and a second gear 312 that are engaged with each other. The first gear 311 is coaxially connected to the operating element 4. The second gear 312 is coaxially connected to an end of the transmission shaft 32 remote from the transmission rod 33.

Specifically, referring to fig. 1 and fig. 2, the first gear 311 and the second gear 312 are both substantially parallel to the supporting plate 22. The operating member 4 may include a first section 41, a second section 42, and a third section 43 connected to each other, wherein the first section 41 is a first section 41 extending along the Y-axis direction. The second section 42 is perpendicular to the first section 41 and is substantially parallel to the support plate 22. The third section 43 is substantially parallel to the first section 41. Wherein the third section 43 is intended to be held by the operator. The first segment 41 is coaxially connected to a central axis of the first gear 311. When an operator holds the third segment 43 and rotates the operating element 4 in the Y-axis direction, the operating element 4 drives the first gear 311 to rotate, the first gear 311 drives the second gear 312 to rotate, the second gear 312 drives the transmission shaft 32 to rotate, the transmission shaft 32 drives the transmission rod 33 to rotate, and the transmission rod 33 drives the projector 5 to "raise" or "lower".

Further, referring to fig. 3, a radius of the first gear 311 is smaller than a radius of the second gear 312.

By setting the radius of the first gear 311 smaller than the radius of the second gear 312, the relatively small rotation angle of the projector 5 is converted into the relatively large rotation angle of the second gear 312, so that the transmission angle of the operating element 4 is large. For example, the radius of the first gear 311 is half of the radius of the second gear 312, and when the projector 5 is raised upward by 45 °, the rotation angle of the second gear 312 is 45 °, and at this time, the rotation angle of the first gear 311 is 90 °, so that the rotation angle of the operating element 4 is large. When the rotation angle of the operating member 4 is large, the angle adjustment of the projector 5 can be made finer, and the projection direction of the projector 5 is made more accurate.

The number of gears in the transmission gear 31 is not limited in the present invention, and two or more gears may be provided according to actual conditions.

Referring to fig. 4, a surface of the bracket 2 facing the first gear 311 is provided with a locking piece 6. The engaging piece 6 and the first gear 311 can be moved toward or away from each other in the array direction. Referring to fig. 3 and 4, when the locking piece 6 is disposed between two adjacent

convex teeth

311a and 311b of the first gear 311, the first gear 311 is locked by the locking piece 6, so that the projector 5 maintains the current angle. Referring to fig. 5, when the locking member 6 is disposed outside the first gear 311, the first gear 311 can rotate along with the operating member 4, so that the projector 5 can rotate.

The above-mentioned latch 6 is provided outside the first gear 311, and means that the latch 6 is located outside a space between two adjacent

convex teeth

311a and 311b of the first gear 311.

Specifically, the locking member 6 may be fixed to the support plate 22 of the holder 2, the first gear 311 may be close to or away from the support plate 22, or the first gear 311 may be fixed to the support plate 22 in the Y-axis direction, and the locking member 6 may be movably connected to the support plate 22 so as to be close to or away from the first gear 311; alternatively, both the first gear 311 and the locking piece 6 are movable in the Y-axis direction relative to the support plate 22 so that the locking piece 6 and the first gear 311 come close to or separate from each other.

Further, the width of the locking member 6 may be equal to or slightly smaller than the distance between two

adjacent teeth

311a and 311b of the first gear 311, so that when the locking member 6 is disposed between two

adjacent teeth

311a and 311b of the first gear 311, the locking member 6 is just locked between two

adjacent teeth

311a and 311b of the first gear 311, and the projector 5 immediately maintains the current position without changing the position of the projector 5, and the stop of the rotation of the projector 5 can be precisely controlled.

Referring to fig. 6, in one embodiment, a protruding shaft 7 is further disposed on a surface of the bracket 2 facing the first gear 311. The protruding shaft 7 is disposed in the shaft hole of the first gear 311. The first gear 311 is rotatable about the protruding shaft 7 and slidable along the protruding shaft 7. In other words, the first gear 311 can be close to or distant from the support plate 22.

When the first gear 311 is close to the support plate 22 of the stand 2 along the protruding shaft 7, the locking piece 6 can be provided between two adjacent protruding

teeth

311a and 311b of the first gear 311 to keep the projector 5 at the current position. When the first gear 311 is far from the supporting plate 22 of the bracket 2 along the protruding shaft 7, the locking member 6 is disposed outside the first gear 311, so that the first gear 311 can drive the projector 5 to rotate.

The first segment 41 of the operating element 4 is disposed in the axial hole of the first gear 311 and spaced from the protruding shaft 7, in this case, the first gear 311 is spaced from the support plate 22, the locking member 6 is disposed outside the first gear 311, and the projector 5 can rotate with the rotation of the operating element 4. By pushing the operating member 4 close to the support plate 22, so that the first gear 311 is close to the support plate 22, until the locking piece 6 is arranged between two adjacent

convex teeth

311a and 311b of the first gear 311, the locking piece 6 can lock the first gear 311, and the projector 5 keeps the current position.

When the projector 5 needs to be rotated again, the operating element 4 is operated to drive the first gear 311 to be away from the supporting plate 22, so that the clamping part 6 is arranged outside the first gear 311, and the projector 5 can rotate along with the rotation of the operating element 4.

Further, referring to fig. 5, a baffle 211 is disposed on the bracket bottom plate 21, the baffle 211 is substantially parallel to the support plate 22, and an edge portion of the first gear 311 is disposed between the baffle 211 and the support plate 22. The baffle 211 is used for limiting the shaft hole of the first gear 311 from being separated from the protruding shaft 7. In other words, when the first gear 311 is close to the shutter 211 or abuts against the shutter 211, the locking member 6 is provided outside the first gear 311, and the projector 5 can be rotated in accordance with the rotation of the operating member 4.

Referring to fig. 7, in another embodiment, the locking member 6 penetrates the holder 2 along the arrangement direction and can extend and contract relative to the support plate 22 of the holder 2. In this embodiment, the first gear 311 may be fixed relative to the support plate 22 in the Y-axis direction. Specifically, the locking member 6 may be a screw rod, the locking member 6 is inserted through and screwed into the support plate 22, and when the locking member 6 rotates, an end of the locking member 6 close to the control member gradually approaches the first gear 311 or gradually moves away from the first gear 311, so that the locking member 6 is disposed between two adjacent teeth of the first gear 311 or disposed outside the first gear 311, thereby controlling the rotation or locking of the projector 5.

When the locking piece 6 approaches the first gear 311, the locking piece 6 can be provided between two

adjacent teeth

311a and 311b of the first gear 311 to hold the projector 5 at the current position. When the locking member 6 is separated from the first gear 311, the locking member 6 is provided outside the first gear 311 so that the projection direction of the projector 5 can be rotated in accordance with the rotation of the operating element 4.

Referring to fig. 8 to 10, a surface of the first gear 311 facing the bracket 2 is provided with at least one engaging member 313. The bracket 2 is provided with a slot 221 matched with the at least one clamping piece 313. When the first gear 311 is close to the bracket 2 by the operation element 4, the at least one engaging member 313 is engaged with the engaging slot 221.

Specifically, the engaging member 313 may be a hook. When the operating element 4 drives the first gear 311 to approach the supporting plate 22, the engaging member 313 is engaged with the engaging slot 221. Since the friction between the engaging piece 313 and the slot 221 is large, when the engaging piece 313 engages with the slot 221, the first gear 311 is locked, and the projector 5 maintains the current position.

In practical application, the engaging member 313 is engaged with the engaging slot 221, and the locking member 6 is disposed between two adjacent

convex teeth

311a and 311b of the first gear 311, which can be used to lock the first gear 311 simultaneously, so that the projector 5 can maintain the current position, and the stability of locking the first gear 311 is increased.

Referring to fig. 10, the number of the engaging members 313 is plural. The engaging members 313 are arranged around the geometric center of the first gear 311. The slot 221 is annular. By arranging the clamping groove 221 to be annular, the plurality of engaging members 313 on the first gear 311 are arranged annularly, so that no matter where the first gear 311 rotates, the engaging members 313 can be engaged with the clamping groove 221, and the position where the engaging members 313 are engaged with the clamping groove 221 cannot be affected by the position of the first gear 311.

Referring to fig. 11 and 12, the base 1 is provided with a sliding groove 11. The bottom surface of the bracket 2 is provided with a slide rail 212. In other words, the surface of the bracket bottom plate 21 connected to the base 1 is provided with the slide rail 212. The slide rail 212 is engaged with the slide groove 11 and slidably connected to the slide groove 11 of the base 1. The sliding rail 212 is circular or arc-shaped, so that the bracket 2 drives the projector 5 to rotate relative to the base 1.

Specifically, the sliding groove 11 on the base 1 is circular, and the sliding rail 212 is circular. The slide rail 212 is installed in the slide groove 11 of the base 1. When the operator pushes the operating element 4 to rotate along the Z-axis direction, the projector 5 rotates around the Z-axis, so that the projection picture of the projector 5 moves along the Y-axis direction, and the angle of the projector 5 in the transverse direction is adjustable.

With the above embodiment, the projection device 100 provided by the embodiment of the present invention can realize angle adjustment in the longitudinal direction and angle adjustment in the transverse direction, and is simple and convenient to operate; moreover, the projection device 100 can enable the projector 5 to lock the current angle in time, and the application reliability and convenience of the projection device 100 are improved.

The foregoing is illustrative of some embodiments of the present invention. It should be noted that. As would be apparent to one of ordinary skill in the art. Without departing from the principles of the present invention. Several improvements and refinements can also be made. Such modifications and refinements are also considered to be within the scope of the present invention.

Claims

1. A projection device is characterized by comprising a base, a support, a transmission assembly, an operating piece and a projector, wherein the support is arranged on the base, the transmission assembly is arranged on the support so as to enable the support to support the transmission assembly, the transmission assembly comprises a first gear, a second gear, a transmission shaft and a transmission rod which are sequentially connected, the first gear and the second gear are meshed and connected, the first gear and the operating piece are arranged on the same side of the support and are coaxially connected, the second gear and one end, far away from the transmission rod, of the transmission shaft are coaxially connected, the transmission shaft penetrates through the support along the arrangement direction of the operating piece, the support and the projector, the transmission rod and the projector are arranged on the same side of the support, one end of the transmission rod is connected with the transmission shaft, the other end of the transmission rod is connected with the projector, and the extending direction of the transmission rod is intersected with the extending direction of the transmission shaft; the operating piece and the projector are suspended in the air relative to the base and are respectively arranged on two opposite sides of the bracket; the projector comprises a shell and a projection lens, wherein part of the projection lens is arranged in the shell, one part of the projection lens is exposed out of the shell through a through hole in the shell, the optical axis direction of the projection lens is intersected with or vertical to the arrangement direction of the operating piece, the bracket and the projector, and when the operating piece rotates around the arrangement direction, the transmission assembly drives the projector to perform pitching motion around the arrangement direction so as to change the projection direction or the projection area of the projector; the radius of the first gear is smaller than that of the second gear, so that the rotating angle of the operating piece is larger, the angle adjustment of the projector is finer, and the projection direction of the projector is more accurate.

2. The projection device of claim 1, wherein when the operating element rotates the first gear about the arrangement direction, the second gear drives the transmission shaft to rotate about the arrangement direction, and the transmission shaft drives the transmission rod to rotate about the arrangement direction, thereby driving the projector to rotate about the arrangement direction.

3. The projection apparatus according to claim 2, wherein a surface of the holder facing the first gear is provided with a locking piece which is capable of approaching or separating from each other in the arrangement direction, and when the locking piece is provided between adjacent two convex teeth of the first gear, the first gear is locked by the locking piece; when the locking member is provided outside the first gear, the first gear can rotate with the operating member.

4. The projection apparatus according to claim 3, wherein a surface of the holder facing the first gear is provided with a protruding shaft provided in a shaft hole of the first gear, the first gear being slidable along the protruding shaft, the engaging member being provided between two adjacent protruding teeth of the first gear when the first gear is close to the holder along the protruding shaft; when the first gear is far away from the bracket along the convex shaft, the clamping stop piece is arranged outside the first gear.

5. The projection apparatus according to claim 3, wherein the locking piece penetrates the holder in the arrangement direction and is capable of extending and contracting with respect to the holder, and when the locking piece is close to the first gear, the locking piece is capable of being provided between adjacent two convex teeth of the first gear; when the clamping part is far away from the first gear, the clamping part is arranged outside the first gear.

6. The projection apparatus according to claim 2, wherein a surface of the first gear facing the bracket is provided with at least one engaging member, the bracket is provided with a slot for engaging with the at least one engaging member, and when the first gear approaches the bracket under the action of the operating member, the at least one engaging member engages with the slot.

7. The projection device of claim 6, wherein the number of the engaging members is plural, the plural engaging members are annular and arranged around a geometric center of the first gear, and the slot is annular.

8. The projection device according to any one of claims 1 to 7, wherein a sliding groove is formed on the base, a sliding rail is arranged on a bottom surface of the bracket, the sliding rail is engaged with the sliding groove and slidably connected to the sliding groove of the base, and the sliding rail is in a circular ring shape or an arc shape, so that the bracket drives the projector to rotate relative to the base.