CN221039751U

CN221039751U - Projection device

Info

Publication number: CN221039751U
Application number: CN202322685959.0U
Authority: CN
Inventors: 辛院厅
Original assignee: Shenzhen Yixiu Technology Co ltd
Current assignee: Shenzhen Yixiu Technology Co ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2024-05-28
Anticipated expiration: 2033-09-28

Abstract

The utility model relates to the technical field of projection lamps, in particular to a projection device which integrates a starry sky projection assembly and a dynamic meteor projection assembly, therefore, the projection device can project starry sky and dynamic meteor, and for a user with the requirements of viewing starry sky and meteor, only one projection device is needed to be purchased, and two devices for respectively projecting starry sky and meteor are not needed to be purchased for cooperation use, so that the purchase cost can be effectively reduced; in addition, the projection device provided by the utility model is provided with the power supply structure which is electrically connected with the dynamic meteor projection assembly and the starry sky projection assembly, and the power supply structure can be used for supplying power to the starry sky projection assembly and also supplying power to the dynamic meteor projection assembly.

Description

Projection device

Technical Field

The utility model relates to the technical field of projection lamps, in particular to a projection device.

Background

In order to enable a user to experience the charm of a starry sky at home, a projection device capable of projecting a starry sky map on a roof, a wall and the like appears on the market so as to meet the requirement of viewing the starry sky by the user.

With the popularization of the projection device, the freshness of the user is gradually reduced, the projection device capable of projecting the star map is difficult to meet the ornamental requirement of the user, in order to solve the technical problem, research and development personnel develop a projection device capable of projecting the meteor on the roof, the wall and the like, and the new projection device has better freshness, so that the projection device is touted by consumers on the market.

The conventional projection device has the disadvantage that for users who have a need to watch starry sky and meteor, the two projection devices need to be purchased at the same time, and the purchase cost is relatively high.

Disclosure of utility model

The technical problem to be solved by the embodiment of the utility model is to provide a projection device, so as to solve the problem that a user with the requirements of viewing starry sky and meteor needs to purchase the projection device at higher cost in the prior art.

The projection device provided by the embodiment of the utility model comprises: the shell is provided with a light transmission area and a light transmission area; the star projection assembly is arranged on the shell and corresponds to the light transmission area, so that the star projection assembly can project a star outside the shell through the light transmission area; the dynamic meteor projection assembly is arranged on the shell and corresponds to the light transmission area, so that the dynamic meteor projection assembly can project meteor towards the outside of the shell through the light transmission area; the power supply structure is arranged on the shell, the starry sky projection assembly and the dynamic meteor projection assembly are electrically connected with the power supply structure, and the power supply structure is used for providing electric energy for the starry sky projection assembly and the dynamic meteor projection assembly.

Optionally, the dynamic meteor projection assembly includes: the first light source is arranged in the shell and faces the light transmission area, and the first light source is electrically connected with the power supply structure; the first slide is fixedly arranged in the light emitting direction of the first light source; the second slide is arranged in the light emitting direction of the first light source; the rotary driving piece is connected with the second slide to drive the second slide to rotate relative to the first slide, and the rotary driving piece is electrically connected with the power supply structure; the first slide is provided with first strip-shaped light transmission lines, and the second slide is provided with second strip-shaped light transmission lines; when the second slide rotates relative to the first slide in the light emitting direction of the first light source, the second strip-shaped light transmission lines can intersect with the first strip-shaped light transmission lines.

Optionally, at least two first strip-shaped light transmission lines are arranged on the first slide; and/or at least two second strip-shaped light transmission lines are arranged on the second slide.

Optionally, the star field projection assembly further comprises: the second light source and the star slide are arranged in the shell and face the light transmission area, and the second light source is electrically connected with the power supply structure; the star-sky lantern slide is arranged in the light emitting direction of the second light source.

Optionally, the dynamic meteor projection assembly further includes a transmission structure connected to the rotation driving member, the second slide and the sky slide, and the rotation driving member drives the sky slide and the second slide to rotate synchronously through the transmission structure.

Optionally, the transmission structure comprises a first gear and a second gear, and the first gear is arranged on the output shaft of the rotary driving piece; the second gear is in transmission connection with the first gear, and the second slide is arranged on the second gear; the starry sky projection assembly further comprises a third gear in transmission connection with the first gear, and the starry sky slide is arranged on the third gear.

Optionally, the transmission structure further includes a reduction gear set, an input end of which is meshed with the first gear, and an output end of which is meshed with the third gear.

Optionally, a plug port is formed in the shell, and the third gear is located between the plug port and the reduction gear set; the projection device further comprises a plug-in component, the plug-in component is detachably arranged at the plug-in port, the third gear is arranged on the plug-in component, and the star-sky slide is detachably arranged on the plug-in component.

Optionally, a first control button and a second control button are arranged on the shell, the first control button is electrically connected with the starry sky projection assembly to control the starry sky projection assembly to open or close projection, and the second control button is electrically connected with the dynamic meteor projection assembly to control the dynamic meteor projection assembly to open or close projection.

Optionally, the housing comprises:

the base is provided with a first arc surface at the top, and an arc chute arranged along the first arc surface is arranged on the first arc surface;

The mounting shell is arranged at the top of the base, the bottom of the mounting shell is provided with a second arc surface which is matched with the first arc surface, a sliding block is arranged on the second arc surface, and the sliding block penetrates through the sliding groove; the light transmission area is arranged on the installation shell, and the starry sky projection assembly and the dynamic meteor projection assembly are both arranged in the installation shell.

Compared with the prior art, the projection device provided by the embodiment of the utility model has the beneficial effects that: the projection device provided by the embodiment of the utility model integrates the starry sky projection assembly and the dynamic meteor projection assembly, so that the projection device provided by the embodiment of the utility model can project starry sky and dynamic meteor, and for a user with the requirements of viewing starry sky and meteor, only one projection device is needed to be purchased, and two devices for respectively projecting starry sky and meteor are not needed to be purchased for cooperation use, so that the purchase cost can be effectively reduced; in addition, the projection device provided by the embodiment of the utility model is provided with the power supply structure which is electrically connected with the dynamic meteor projection assembly and the starry sky projection assembly, and the power supply structure can be used for supplying power to the starry sky projection assembly and also supplying power to the dynamic meteor projection assembly.

Drawings

The utility model will now be described in further detail with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic perspective view of a projection apparatus according to an embodiment of the present utility model;

FIG. 2 is a schematic perspective view of the projection device of FIG. 1 at another angle;

FIG. 3 is an exploded view of a projection device according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a portion of a projection apparatus according to an embodiment of the present utility model;

FIG. 5 is an exploded view of a portion of a projection device according to an embodiment of the present utility model;

Fig. 6 is an exploded view of a base and a mounting case according to an embodiment of the present utility model.

The reference numerals in the drawings are as follows:

1000. A projection device;

100. A housing; 110. a light transmission region; 111. a first opening; 112. a second opening; 130. a plug port; 140. a base; 141. a first arc surface; 1411. arc chute; 150. a mounting shell; 151. a second arc surface; 1511. a slide block;

200. A starry sky projection assembly; 210. a second light source; 220. star slides; 230. a third gear; 240. an adjustment knob; 250. a lens mount; 260. an imaging lens;

300. A dynamic meteor projection assembly; 310. a first light source; 320. a first slide; 330. a second slide; 340. a rotary driving member; 350. a transmission structure; 351. a first gear; 352. a second gear; 353. a reduction gear set; 360. a third condensing lens;

400. A power supply structure; 410. an interface;

500. a plug-in component; 510. a notch;

600. a first control button;

700. and a second control button.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.

An embodiment of the present utility model provides a projection apparatus 1000, as shown in fig. 1-4, the projection apparatus 1000 includes a housing 100, a star field projection assembly 200, a dynamic meteor field projection assembly 300, and a power supply structure 400. The star-sky projection assembly 200 is disposed on the housing 100 and corresponds to the light-transmitting area 110, so that the star-sky projection assembly 200 can project a star sky outside the housing 100 through the light-transmitting area 110. The dynamic meteor projection assembly 300 is disposed on the housing 100 and corresponds to the light-transmitting area 110, so that the dynamic meteor projection assembly 300 can project meteor outside the housing 100 through the light-transmitting area 110. The power supply structure 400 is disposed in the housing 100, and the starry sky projection assembly 200 and the dynamic meteor projection assembly 300 are electrically connected to the power supply structure 400, wherein the power supply structure 400 is used for providing power to the starry sky projection assembly 200 and the dynamic meteor projection assembly 300.

The present embodiment provides a projection apparatus 1000 that integrates a star projection assembly 200 and a dynamic meteor projection assembly 300. Therefore, the projection device 1000 of this embodiment may project both a star field and a dynamic meteor. For a user who needs to watch starry sky and meteor, only one projection device 1000 is needed to be purchased, and two devices for respectively projecting starry sky and meteor are not needed to be purchased to be matched for use. Therefore, the purchasing cost can be reduced by implementing the embodiment.

The light-transmitting area 110 includes a first opening 111 and a second opening 112, and the star-sky projection assembly 200 is disposed corresponding to the first opening 111, so that the star-sky projection assembly 200 can project a star sky outside the housing 100 through the first opening 111; the dynamic meteor projection assembly 300 is disposed corresponding to the second opening 112, such that the dynamic meteor projection assembly 300 can project meteor towards the outside of the housing 100 through the second opening 112.

Alternatively, the light-transmitting area 100 may include only one opening, through which the star-projecting assembly 200 and the dynamic meteor-projecting assembly 300 project toward the outside of the housing 100.

It should be noted that the projection apparatus 1000 of the present embodiment has a power supply structure 400 electrically connected to the dynamic meteor projection assembly 300 and the starry sky projection assembly 200. That is, the power supply structure 400 can be used to supply power to not only the starry sky projection assembly 200 but also the dynamic meteor projection assembly 300. Compared with the embodiment in which two power supply structures 400 are provided to supply power to the star-projection assembly 200 and the dynamic meteor projection assembly 300, the present embodiment can reduce the production cost of the projection device 1000, thereby reducing the purchase cost of the user.

There are a number of embodiments of the power supply structure 400, and the following list of three examples is provided for reference:

Referring to fig. 2, in the first embodiment, the power supply structure 400 is a battery built in the housing 100. Specifically, in order to charge the battery built in the housing 100, an interface 410 electrically connected to the battery, such as a TYPE-C socket, a Micro-USB socket, etc., exposed to the housing 100 may be further provided, so as to charge the built-in battery by using a charging wire.

In the second embodiment, the power supply structure 400 is a power supply interface, such as a TYPE-C female socket, a Micro-USB female socket, and the like.

In the third embodiment, the power supply structure 400 is a battery box, and the user can supply power to the dynamic meteor projection assembly 300 and the starry sky projection assembly 200 by loading a battery No. five, a battery No. seven or other types of batteries into the battery box. The embodiment has the advantage that when the battery in the battery box is dead, the battery with sufficient electric quantity can be quickly replaced.

Referring to fig. 3-5, in a particular embodiment, dynamic meteor projection assembly 300 includes a first light source 310, a first slide 320, a second slide 330, and a rotational drive 340. The first light source 310 is disposed in the housing 100 and faces the light-transmitting area 110, so that the light emitted from the first light source 310 can be emitted through the light-transmitting area 110, and the first light source 310 is electrically connected to the power supply structure 400. The first slide 320 is fixedly disposed in the light emitting direction of the first light source 310, so that the light emitted from the first light source 310 can be irradiated on the first slide 320. The second slide 330 is disposed in the light emitting direction of the first light source 310, so that the light emitted from the first light source 310 can be irradiated on the second slide 330. The rotary driving member 340 is connected to the second slide 330 to drive the second slide 330 to rotate relative to the first slide 320, and the rotary driving member 340 is electrically connected to the power supply structure 400.

Specifically, the first slide 320 is provided with a first strip-shaped light transmission line, the second slide 330 is provided with a second strip-shaped light transmission line, and when the second slide 330 rotates relative to the first slide 320, the second strip-shaped light transmission line can intersect with the first strip-shaped light transmission line.

It should be noted that the first slide 320 may be disposed between the second slide 330 and the first light source 310, or the second slide may be disposed between the first slide 320 and the first light source 310, which is not limited herein.

Taking the example that the second slide 330 is disposed between the first slide 320 and the second light source 210, after the light emitted from the second light source 210 irradiates the second slide 330, the light passes through the second stripe-shaped light transmission line, that is, the light emitted from the second slide 330 is stripe-shaped. Since the first stripe-shaped light-transmitting pattern can intersect with the second stripe-shaped light-transmitting pattern when the second slide 330 rotates relative to the first slide 320, the light emitted from the second slide 330 is emitted from the intersection point of the first stripe-shaped light-transmitting pattern and the second stripe-shaped light-transmitting pattern after being irradiated onto the first slide 320, and the emitted light is a light spot. As the second slide 330 continues to rotate relative to the first slide 320, the intersection position changes, so that the position of the light spot exiting the first stripe-shaped light transmission line changes continuously, and looks like a meteor.

In a specific embodiment, at least two first strip-shaped light transmission lines are provided on the first slide 320; and/or, at least two second strip-shaped light transmission lines are arranged on the second slide 330.

Specifically, if only one first strip-shaped light-transmitting line and one second strip-shaped light-transmitting line are arranged, only one meteor is projected, and the visual experience is poor. By implementing the embodiment, the number of the first strip-shaped light transmission lines and/or the number of the second strip-shaped light transmission lines is increased, so that the number of the projected meteorons is increased, and the user experience is good if meteorous rain.

Referring to fig. 3-5, in one embodiment, the starry sky projection assembly 200 further includes a second light source 210 and a starry sky slide 220. The second light source 210 is disposed in the housing 100 and faces the light-transmitting area 110, so that the light emitted from the second light source 210 can be emitted through the light-transmitting area 110, and the second light source 210 is electrically connected to the power supply structure 400. The star slide 220 is installed in the light emitting direction of the second light source 210, so that the light emitted from the second light source 210 can be irradiated on the star slide 220.

Specifically, the light emitted from the second light source 210 irradiates on the star slide 220, and the light passes through the star slide 220 to be projected onto a wall or a roof, so that a star map is projected. Illustratively, a moon pattern may be printed on the slide, thereby enabling the starry sky projection assembly 200 to project the moon. Alternatively, the slide may be printed with the earth pattern or the pattern of the silver series.

Referring to fig. 3-5, in an embodiment, dynamic meteor projection assembly 300 further includes a transmission structure 350, wherein transmission structure 350 is connected to rotary driving member 340, second slide 330 and star slide 220, and rotary driving member 340 simultaneously rotates star slide 220 and second slide 330 via transmission structure 350.

In the first aspect, the star slide 220 in this embodiment can rotate, so that the star map projected on the wall and roof of the cavity can also rotate along with the rotation of the new illusion light sheet, and the dynamic star map looks very beautiful, so that the visual experience brought by the user is very good.

In the second aspect, by implementing the present embodiment, only one rotation driving member 340 is required, so that the star-shaped slide 220 and the second slide 330 can be rotated synchronously, and compared with the embodiment in which two rotation driving members are required to drive the star-shaped slide 220 and the second slide 330 to rotate respectively, the present embodiment can reduce the production cost of the projection apparatus 1000 and the energy consumption of the projection apparatus 1000 in use.

Referring to fig. 3-5, in a particular embodiment, the transmission structure 350 includes a first gear 351 and a second gear 352. The first gear 351 is mounted on the output shaft of the rotary driver 340. The second gear 352 is in driving connection with the first gear 351, and the second slide 330 is mounted on the second gear 352. The star-sky projector assembly 200 further includes a third gear 230, the third gear 230 is in driving connection with the first gear 351, and the star-sky slide 220 is mounted on the third gear 230.

By implementing the embodiment, when the rotary driving member 340 drives the first gear 351 to rotate, the second gear 352 and the third gear 230 will synchronously rotate, and because the second slide 330 is mounted on the second gear 352 and the sky slide 220 is mounted on the third gear 230, the implementation of the embodiment can realize that one rotary driving member 340 synchronously drives the second slide 330 and the sky slide 220 to rotate.

It should be noted that, when the second gear 352 and the third gear 230 are in driving connection with the first gear 351 to indicate that the first gear 351 rotates, the second gear 352 and the third gear 230 rotate along with the rotation, and the scheme includes that the second gear 352 and the third gear 230 mesh with the first gear 351, and also includes that the second gear 352 and the third gear 230 are connected with the first gear 351 through other parts, which is not limited herein.

Referring to fig. 3-5, in a specific embodiment, the transmission structure 350 further includes a reduction gear set 353, the reduction gear set 353 having an input end engaged with the first gear 351 and an output end engaged with the third gear 352. In this way, when the rotation driving member 340 drives the first gear 351 to rotate, the reduction gear set 353 will rotate synchronously, and because the output end of the reduction gear set 353 is meshed with the third gear 352, the third gear 230 will also rotate synchronously, so as to drive the star slide 220 to rotate.

Specifically, the reduction gear set 353 is a preferred transmission structure 350 capable of realizing reduction, and by implementing the present embodiment, the third gear 230 can be rotated at a suitable speed, so as to avoid the situation that the third gear 230 rotates too fast, which results in the user's blinding.

Referring to fig. 2-6, in a specific embodiment, a plug opening 130 is provided on the housing 100, a plug 500 is detachably mounted on the plug opening 130, a third gear 230 is mounted on the plug 500, and a star slide 220 is detachably mounted on the plug 500.

By implementing the embodiment, the plug-in component 500 can be pulled out from the plug-in port 130, and the star-sky lantern slide 220 can be replaced, so that the projection device 1000 can project different star-sky diagrams, and the user experience is better. Illustratively, the star slide 220 is detachably mounted on the third gear 230, so that only the star slide 220 can be replaced; or the sky slide 220 is fixedly arranged on the third gear 230, the third gear 230 is detachably arranged on the plug-in 500, and the sky slide 220 is replaced by replacing the third gear 230.

In order to facilitate the insertion and extraction of the plug-in unit 500, the reduction gear set 353 is prevented from interfering with the insertion and extraction of the plug-in unit 500, and the third gear 230 of the present embodiment is located between the insertion opening 130 and the reduction gear set 353, i.e. when the plug-in unit 500 is extracted, the third gear 230 is pulled away from the reduction gear set 353, so that interference does not occur, and when the plug-in unit 500 is inserted, the third gear 230 gradually approaches the reduction gear set 353 until the output end of the third gear 230 is engaged with the reduction gear set 353.

Referring to fig. 2-6, in a specific embodiment, the plug member 500 is a plug tray, a receiving groove is disposed on a side of the plug tray facing away from the second light source 210, the third gear 230 is disposed in the receiving groove, a notch 510 communicating with the receiving groove is disposed at an edge of the plug tray, and an edge of the third gear 230 is exposed to the notch 510, so that the third gear 230 can be meshed with an output end of the reduction gear set 353.

Referring to fig. 1, in an embodiment, a first control button 600 and a second control button 700 are disposed on the housing 100, the first control button 600 is electrically connected to the star-projection assembly 200 to control the star-projection assembly 200 to turn on or off the projection, and the second control button 700 is electrically connected to the dynamic meteor-projection assembly 300 to control the dynamic meteor-projection assembly 300 to turn on or off the projection.

By implementing the embodiment, the user can control the star projection assembly 200 and the dynamic meteor projection assembly 300 by using the first control button 600 and the second control button 700 respectively, so that a projection mode is increased, and the user experience is better. Illustratively, during use of the starburst projection assembly 200 with the dynamic meteor projection assembly 300, if the user suddenly wants to view only the starburst, the second control button 700 may be used to control the dynamic meteor projection assembly 300 to turn off the projection, and then if the user suddenly wants to view only the meteor, the first control button 600 may be used to control the starburst projection assembly 200 to turn off the projection, and the second control button 700 may be used to control the dynamic meteor projection assembly 300 to turn on the projection.

Referring to fig. 6, in one embodiment, the housing 100 includes a base 140 and a mounting case 150. The top of the base 140 has a first arc surface 141, and the first arc surface 141 is provided with an arc chute 1411 along the first arc surface 141. The installation shell 150 is installed at the top of the ground base, and the bottom of the installation shell 150 is provided with a second arc surface 151 which is matched with the first arc surface 141. The second arc surface 151 is provided with a sliding block 1511, and the sliding block 1511 is arranged at the sliding groove in a penetrating way. The light-transmitting area 110 is disposed on the mounting housing 150, and the star-shaped projection assembly 200 and the dynamic meteor-shaped projection assembly 300 are both disposed in the mounting housing 150.

By implementing the embodiment, the projection area of the projection device 1000 can be adjusted by the user, so that the projection area is not limited only by the placement position of the projection device 1000, and the user experience is better. Specifically, the mounting case 150 of the present embodiment can rotate along the circular arc chute 1411 on the base 140, thereby changing the projection area of the projection apparatus 1000.

Referring to fig. 3-5, in one embodiment, the star field projection assembly 200 further includes an adjustment knob 240, a lens mount 250, and an imaging lens 260. The adjusting knob 240 is rotatably disposed at the light-transmitting area 110, the lens mount 250 is fixedly disposed at a side of the star-sky lantern slide 220 away from the second light source 210, a through hole opposite to the star-sky lantern slide 220 is disposed on the lens mount 250, and an internal thread is disposed on a wall of the through hole. The imaging lens 260 is installed at the through hole and is fixedly connected with the adjusting knob 240, and an external tooth matched with the internal thread for use is arranged at the outer side of the imaging lens 260.

By implementing the embodiment, when the adjusting knob 240 is rotated, the internal thread on the wall of the through hole and the external thread on the outer side of the imaging lens 260 will move relatively, so as to drive the imaging lens 260 to move towards the direction close to or far from the star-sky slide 220, thereby adjusting the focal length and adapting the non-passing projection distance, so that the projection device 1000 can project clear star-sky under different projection distances.

In order to further improve the imaging quality of the sky projection assembly 200, in an embodiment, a first condensing lens and a second condensing lens are further disposed between the second light source 210 and the sky lantern 220.

To further improve the imaging quality of the dynamic meteor projection assembly 300, referring to fig. 5, in an embodiment, a third polarizer 360 is further disposed between the first light source 310 and the first slide 320.

It should be understood that the foregoing embodiments are merely illustrative of the technical solutions of the present utility model, and not limiting thereof, and that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art; all such modifications and substitutions are intended to be included within the scope of this disclosure as defined in the following claims.

Claims

1. A projection apparatus, comprising:

The shell is provided with a light transmission area;

The star projection assembly is arranged on the shell and corresponds to the light transmission area, so that the star projection assembly can project a star outside the shell through the light transmission area;

The dynamic meteor projection assembly is arranged on the shell and corresponds to the light transmission area, so that the dynamic meteor projection assembly can project meteor towards the outside of the shell through the light transmission area;

The power supply structure is arranged on the shell, the starry sky projection assembly and the dynamic meteor projection assembly are electrically connected with the power supply structure, and the power supply structure is used for providing electric energy for the starry sky projection assembly and the dynamic meteor projection assembly.

2. The projection device of claim 1, wherein the dynamic meteor projection assembly comprises:

The first light source is arranged in the shell and faces the light transmission area, and the first light source is electrically connected with the power supply structure;

the first slide is fixedly arranged in the light emitting direction of the first light source;

The second slide is arranged in the light emitting direction of the first light source;

The rotary driving piece is connected with the second slide to drive the second slide to rotate relative to the first slide, and the rotary driving piece is electrically connected with the power supply structure;

the first slide is provided with first strip-shaped light transmission lines, and the second slide is provided with second strip-shaped light transmission lines; when the second slide rotates relative to the first slide in the light emitting direction of the first light source, the second strip-shaped light transmission lines can intersect with the first strip-shaped light transmission lines.

3. The projection device of claim 2, wherein at least two of the first stripe-shaped light-transmitting stripes are provided on the first slide; and/or at least two second strip-shaped light transmission lines are arranged on the second slide.

4. The projection device of claim 2, wherein the starry sky projection assembly further comprises: the second light source and the star slide are arranged in the shell and face the light transmission area, and the second light source is electrically connected with the power supply structure; the star-sky lantern slide is arranged in the light emitting direction of the second light source.

5. The projection device of claim 4, wherein the dynamic meteor projection assembly further comprises a transmission structure coupled to the rotational drive member, the second slide, and the starry sky slide, the rotational drive member synchronously rotating the starry sky slide and the second slide via the transmission structure.

6. The projection device of claim 5, wherein the transmission structure comprises a first gear and a second gear, the first gear being mounted on the output shaft of the rotary drive; the second gear is in transmission connection with the first gear, and the second slide is arranged on the second gear; the starry sky projection assembly further comprises a third gear in transmission connection with the first gear, and the starry sky slide is arranged on the third gear.

7. The projection device of claim 6, wherein the transmission further comprises a reduction gear set having an input engaged with the first gear and an output engaged with the third gear.

8. The projection device of claim 7, wherein the housing is provided with a plug opening, and the third gear is positioned between the plug opening and the reduction gear set; the projection device further comprises a plug-in component, the plug-in component is detachably arranged at the plug-in port, the third gear is arranged on the plug-in component, and the star-sky slide is detachably arranged on the plug-in component.

9. The projection device of any one of claims 1-8, wherein a first control button and a second control button are provided on the housing, the first control button is electrically connected to the star-projection assembly to control the star-projection assembly to turn on or off the projection, and the second control button is electrically connected to the dynamic meteor-projection assembly to control the dynamic meteor-projection assembly to turn on or off the projection.

10. The projection device of any one of claims 1-8, wherein the housing comprises: