CN222047137U - A picture position adjustment structure for projection equipment - Google Patents

Abstract

The utility model discloses a picture position adjusting structure for projection equipment, which comprises a positioning component and an adjusting component, wherein the positioning component is arranged on a bottom plate of a projection device, and the adjusting component is in sliding fit with the positioning component; the positioning component comprises a fixed plate and a guide block connected with the fixed plate; the adjusting component comprises a moving plate which is connected with the fixed plate in a sliding way and a driving device which drives the moving plate to reciprocate; the guide block is internally provided with a guide hole, and one part of the sliding block penetrates through the guide hole to be connected with the moving plate; a plurality of first guide posts are arranged on one side of the movable plate, which is far away from the fixed plate, and when the movable plate is far away from the fixed plate, the first guide posts penetrate through the bottom plate of the projection device to extend downwards to move so as to drive the front side of the projection device to lift upwards; the utility model adopts the combined design of the stepping motor, the gear reduction box, the worm and the sliding block, does not need manual adjustment by an electric adjustment mode, is more suitable for adjusting the picture position of the ultra-short-focus projection equipment close to a wall, and has high centering degree and good linear motion stability.

Description

Picture position adjusting structure for projection equipment

Technical Field

The present utility model relates to the field of projection devices, and in particular, to a structure for adjusting a screen position of a projection device.

Background

Projection devices have a wide range of applications in everyday life, such as educational training, home theatres, business displays, digital advertising, and the like. With the continuous progress of projection technology, the performances of resolution, brightness, color rendition and the like of projection equipment are obviously improved, and meanwhile, the intelligentization, ultra-short focus and high resolution are also development trends of the projection equipment. An ultra-short focal projection device is a special type of projection device that is characterized by the ability to project large-sized images within an extremely short distance. Compared with the traditional projection device, the ultra-short focal projection device can be placed below a screen or a wall, the projection distance is very close, and the problems of shadows and light loss are almost eliminated. Also because of the short projection distance, it is suitable for use in environments where space is limited, such as classrooms, conference rooms, home living rooms, etc. In general, ultra-short focal projection has obvious advantages in projection distance, space utilization, interactivity, projection quality and the like, and is favored by more and more users.

The conventional projection device usually has an adjusting structure at the bottom thereof near the front side of the projection screen, and the front side of the projection device is lifted by screwing to achieve the vertical position adjustment of the projection screen. However, because the projection distance of the ultra-short focus is short, the projection distance is usually too close to a wall, when the up-and-down position of a projection picture needs to be adjusted, the existing screwing picture position adjusting mode applied to the traditional projection equipment is not applicable any more, and the close-range operation is difficult to ensure the accuracy of the up-and-down position adjustment, so that the operation is troublesome, and the adjustment is accurate and difficult to grasp. In addition, because the overall weight of projection equipment often reaches more than 5kg, the current picture up-down position adjustment structure needs more supporting parts to be used for stable adjustment, and the structure is complicated, and the cost is high.

Therefore, further development is needed to solve the above technical problems in the prior art.

Disclosure of utility model

Accordingly, in order to solve the problems of the prior art described above, an object of the present utility model is to provide a screen position adjusting structure for a projection apparatus.

The utility model adopts the following technical scheme:

A picture position adjusting structure for projection equipment comprises a positioning component arranged on a bottom plate of a projection device and an adjusting component in sliding fit with the positioning component; the positioning assembly comprises a fixed plate and a guide block connected with the fixed plate; the adjusting component comprises a moving plate which is in sliding connection with the fixed plate and a driving device which drives the moving plate to reciprocate; an output shaft of the driving device is in transmission connection with the moving plate through a sliding block, and drives the moving plate to reciprocate in a direction approaching or separating from the fixed plate; a guide hole is formed in the guide block, and a part of the sliding block penetrates through the guide hole to be connected with the moving plate; and one side of the movable plate, which is far away from the fixed plate, is provided with a plurality of first guide posts, and when the movable plate is far away from the fixed plate, the first guide posts penetrate through the bottom plate of the projection device to extend downwards to drive the front side of the projection device to lift upwards.

Further, the driving device comprises a stepping motor and a gear reduction box; the output shaft of the gear reduction box is a worm shaft, and a transmission part meshed and matched with the worm shaft is arranged in the sliding block.

Further, a plurality of second guide posts are arranged between the guide blocks and the driving device, guide platforms which are in sliding fit with the second guide posts are arranged at the end parts of the sliding blocks, and when the driving device drives the sliding blocks to move, the guide platforms axially move along the second guide posts.

Further, a plurality of third guide posts are arranged on the moving plate, through holes matched with the third guide posts are formed in the fixed plate, and one end of each third guide post penetrates through the through hole of the fixed plate and slides along the through hole under the driving of the moving plate.

Further, a fourth guide post is arranged in the middle of the moving plate, and is penetrated in the guide hole of the guide block and connected with the sliding block

Further, one end of the third guide pillar penetrating through the fixing plate is sleeved with an elastic buffer part, the tail end of the third guide pillar is provided with a limiting ring, one end of the elastic buffer part is fixed with the fixing plate, and the other end of the elastic buffer part is fixed with the limiting ring.

Further, the guide platform is a square guide platform, and the two second guide posts penetrate through the opposite corners of the guide platform; the fixing plate is a square fixing plate, and four third guide posts penetrate through four corners of the fixing plate.

Further, the elastic buffer is a compression spring.

Further, the picture position adjusting structure further comprises a circuit board assembly, wherein the circuit board assembly comprises a circuit board fixed on one side of the guide block and two groove-shaped light interruption sensors connected with the circuit board; the guide platform is provided with a bulge corresponding to the light interruption sensor.

Further, the guide block is provided with a bracket for installing the circuit board and the photo-interrupter sensor, the bracket comprises a bottom plate fixed on the guide block and a side plate formed by bending upwards from one side of the bottom plate, the circuit board is arranged on the outer side of the side plate, and the two photo-interrupters are arranged at the upper end and the lower end of the inner side of the side plate; the slider passes through the bottom plate.

Further, the shape of the bottom plate is matched with the upper end of the guide block, the bottom plate, the guide block and the fixed plate are all provided with assembly holes, and the bottom plate and the guide block are simultaneously installed on the fixed plate through fasteners.

Compared with the prior art, the utility model has the beneficial effects that:

The picture position adjusting structure of the projection equipment does not need manual adjustment by an electric adjustment mode, greatly reduces the manual interference, is more suitable for the picture position adjustment of the ultra-short focal projection equipment close to a wall, and ensures that the adjustment of the upper and lower positions of a projection picture is more intelligent and convenient; furthermore, the utility model adopts the combined design of the stepping motor, the gear reduction box, the worm and the sliding block, realizes better transmission ratio through the meshing and matching of the worm and the sliding block transmission part, can also design and utilize the lead angle design of the worm according to actual needs, can achieve better self-locking effect, can not slide under the condition of no power, and keeps the stability of the action;

On the other hand, the utility model can reduce instability and vibration in the motion process through the multiple limiting guide actions of the first guide post, the second guide post, the third guide post and the fourth guide post, so that the linear motion is smoother, and the centrality and the stability of the linear motion of the adjusting structure are ensured to the greatest extent; the assembly efficiency of the projector is improved, the structure is miniaturized, the output moment is large, and the noise is low;

Meanwhile, a buffer spring is added on the third guide post, so that the movable plate can normally retract in the retraction process, the movable plate is assisted to better return, and the movable plate is prevented from being displaced under the action of gravity by applying force to the movable plate, so that the stability and the reliability of the system are further improved.

Drawings

FIG. 1 is a schematic diagram showing the overall structure of a picture position adjusting structure for a projection apparatus according to a preferred embodiment of the present utility model;

FIG. 2 is another angular schematic view of the overall structure of a picture position adjustment structure for a projection apparatus according to a preferred embodiment of the present utility model;

FIG. 3 is an exploded view showing the overall structure of a picture position adjustment structure for a projection apparatus according to a preferred embodiment of the present utility model;

FIG. 4 is a schematic cross-sectional view showing the whole structure of a picture position adjusting structure for a projection apparatus according to a preferred embodiment of the present utility model;

Fig. 5 is a schematic view showing a state that a moving plate is away from a fixed plate after an elastic buffer is omitted in a picture position adjusting structure for a projection apparatus according to a preferred embodiment of the present utility model.

In the figure:

1. A positioning assembly; 11. a fixing plate; 111. a through hole; 12. a guide block; 121. a guide hole; 13. a second guide post;

2. An adjustment assembly; 21. a moving plate; 211. a third guide post; 2111. a limiting ring; 212. a fourth guide post; 22. a driving device; 221. a stepping motor; 222. a gear reduction box; 223. a worm shaft; 23. a slide block; 231. a transmission part; 232. a guiding platform; 2321. a protrusion; 24. a first guide post;

3. An elastic buffer member;

4. A circuit board assembly; 41. a circuit board; 42. a light interruption sensor; 43. a bracket; 431. a bottom plate; 432. a side plate;

5. And (5) assembling holes.

Detailed Description

In order to facilitate understanding of the present utility model, the following detailed description of the technical solution and advantages of the present utility model will be given with reference to the accompanying drawings and examples. Specific constructions and features are described below by way of example and should not be construed as limiting the utility model in any way. Also, any feature mentioned (including implicit or explicit) below, as well as any feature shown directly or implicit in the drawings, may be continued to be any combination or deletion of such features among themselves, to form still other embodiments that may not be directly or indirectly mentioned in the present utility model. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

As shown in fig. 1-5, the present utility model provides a picture position adjusting structure for a projection apparatus, which is mainly used for changing the height of the front side of the projection apparatus relative to a platform on which the projection apparatus is placed, so as to change the projection height and the projection angle, thereby completing the adjustment of the vertical position of the projection picture. Of course, it can also be applied to adjustment of the lateral position of the projection screen.

The picture position adjusting structure comprises a positioning component 1 arranged on a bottom plate of the projection equipment and an adjusting component 2 in sliding fit with the positioning component 1; the positioning assembly 1 comprises a fixed plate 11 and a guide block 12 connected with the fixed plate 11; the adjusting assembly 2 comprises a moving plate 21 which is in sliding connection with the fixed plate 11 and a driving device 22 which drives the moving plate 21 to reciprocate; an output shaft of the driving device 22 is in transmission connection with the moving plate 21 through a sliding block 23, and drives the moving plate 21 to reciprocate in a direction approaching or separating from the fixed plate 11; a guide hole 121 is formed in the guide block 12, and a part of the sliding block 23 passes through the guide hole 121 and is connected with the moving plate 21; the side of the movable plate 21, which is far away from the fixed plate 11, is provided with a plurality of first guide posts 24, when the movable plate 21 is far away from the fixed plate 11, the first guide posts 24 penetrate through a bottom plate 431 of the projection device to extend downwards to move against a platform on which the projection device is placed, and the front side of the projection device is driven to be lifted upwards by the fixed plate 11 fixed on the bottom plate of the projection device. The greater the distance between the moving plate 21 and the fixed plate 11, the greater the height of the fixed plate 11 driving the front side of the projection device to rise upwards, i.e. the projection picture is adjusted upwards.

The picture position adjusting structure of the projection equipment does not need manual adjustment by an electric adjustment mode, greatly reduces manual interference, is more suitable for picture position adjustment of ultra-short focal projection equipment close to a wall, and enables adjustment of upper and lower positions of a projection picture to be more intelligent and convenient.

Preferably, the driving device 22 comprises a stepping motor 221 and a gear reduction box 222; the output shaft of the gear reduction box 222 is a worm shaft 223, and a transmission part 231 engaged with the worm shaft 223 is provided in the slider 23. In this embodiment, the combination design of the stepping motor 221, the gear reduction box 222, the worm and the sliding block 23 is adopted, and by the meshing and matching of the worm and the transmission part 231 of the sliding block 23, a better transmission ratio is realized, and the lead angle design of the worm (not specifically limited here) can be designed and utilized according to actual needs, so that a better self-locking effect can be achieved, sliding can not occur under the condition of no power, and the stability of the action is maintained.

Preferably, a plurality of second guide posts 13 are disposed between the guide block 12 and the driving device 22, a guide platform 232 slidably engaged with the second guide posts 13 is disposed at an end of the slider 23, and when the driving device 22 drives the slider 23 to move, the guide platform 232 moves axially along the second guide posts 13. This can improve the centering and stability of the relative movement of the slider 23 and the guide block 12.

In order to further increase the centering between the stepper motor 221 and the sliding block 23, to make the movement more stable, preferably, the moving plate 21 is provided with a plurality of third guide posts 211, the fixing plate 11 is provided with a through hole 111 adapted to the third guide posts 211, and one end of the third guide post 211 passes through the through hole 111 of the fixing plate 11 and slides along the through hole 111 under the driving of the moving plate 21.

Further elaboration, a fourth guide post 212 is arranged in the middle of the moving plate, and the fourth guide post 212 is arranged in the guide hole 121 of the guide block 12 in a penetrating manner and is connected with the sliding block.

Further, the guiding platform 232 is a square guiding platform 232, and the two second guide posts are arranged at opposite angles of the guiding platform 232 in a penetrating manner; the fixing plate 11 is a square fixing plate 11, and four third guide posts penetrate through four corners of the fixing plate 11.

The device has the advantages that through the multiple limiting guide actions of the first guide post, the second guide post, the third guide post and the fourth guide post, instability and vibration in the moving process can be reduced, so that linear movement is smoother, and the centrality and stability of the linear movement of the adjusting structure are ensured to the greatest extent; and the components are matched more tightly, so that faults caused by loosening or friction can be reduced, and the reliability and the durability of the equipment are improved. Meanwhile, the design centrality has the advantage of ensuring the accurate matching among all the components, thereby ensuring the accuracy of linear motion.

Preferably, an elastic buffer member 3 is sleeved at one end of the third guide pillar 211 penetrating through the fixing plate 11, a limiting ring 2111 is arranged at the tail end of the third guide pillar, one end of the elastic buffer member 3 is fixed with the fixing plate 11, and the other end of the elastic buffer member 3 is fixed with the limiting ring 2111. Further refined, the elastic buffer 3 is a compression spring. In this embodiment, a buffer spring is added to the third guide post, so that the moving plate 21 can normally retract during the retraction process, and the moving plate 21 is prevented from being displaced under the action of gravity by applying a force to the moving plate 21, so that the stability and reliability of the system are further improved.

Preferably, the picture position adjusting structure further comprises a circuit board 41 assembly 4, wherein the circuit board 41 assembly 4 comprises a circuit board 41 fixed on one side of the guide block 12 and two groove-shaped light interruption sensors 42 connected with the circuit board 41; the guide platform 232 is provided with a protrusion 2321 corresponding to the light interruption sensor 42. The assembly mode of the circuit board 41 assembly 4 is that a bracket 43 for installing the circuit board 41 and the photo interrupter sensor 42 is arranged on the guide block 12, the bracket 43 comprises a bottom plate 431 fixed on the guide block 12 and a side plate 432 formed by bending upwards from one side of the bottom plate 431, the circuit board 41 is arranged on the outer side of the side plate 432, and two photo interrupters are arranged on the upper and lower ends of the inner side of the side plate 432; the slider 23 passes through the bottom plate 431. In the present embodiment, the light interruption sensor 42 is operated on the principle that the presence or absence of an object is determined by detecting the interruption of light, thereby realizing object detection, position detection, and the like. Reference may be made specifically to the photo interrupter sensor 42 of the prior art.

In order to improve the overall assembly stability, preferably, the shape of the bottom plate 431 is adapted to the upper ends of the guide blocks 12, the bottom plate 431, the guide blocks 12 and the fixing plate 11 are all provided with assembly holes 5, and the bottom plate 431 and the guide blocks 12 are simultaneously mounted on the fixing plate 11 through fasteners.

It should be noted that the present utility model also includes other electrical components such as a controller or other electrical wires that satisfy the electric adjustment function, and the details thereof will not be described herein.

The above-described embodiments are only preferred embodiments of the present utility model and should not be construed as limiting the scope of the utility model, it will be appreciated by those skilled in the art that numerous changes, modifications, substitutions and alterations can be made hereto without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.

Claims (10)

1. The picture position adjusting structure for the projection equipment is characterized by comprising a positioning component and an adjusting component, wherein the positioning component is arranged on a bottom plate of a projection device, and the adjusting component is in sliding fit with the positioning component; the positioning assembly comprises a fixed plate and a guide block connected with the fixed plate; the adjusting component comprises a moving plate which is in sliding connection with the fixed plate and a driving device which drives the moving plate to reciprocate; an output shaft of the driving device is in transmission connection with the moving plate through a sliding block, and drives the moving plate to reciprocate in a direction approaching or separating from the fixed plate; a guide hole is formed in the guide block, and a part of the sliding block penetrates through the guide hole to be connected with the moving plate; and one side of the movable plate, which is far away from the fixed plate, is provided with a plurality of first guide posts, and when the movable plate is far away from the fixed plate, the first guide posts penetrate through the bottom plate of the projection device to extend downwards to drive the front side of the projection device to lift upwards.

2. The picture position adjustment structure for a projection apparatus according to claim 1, wherein the driving means includes a stepping motor, a gear reduction box; the output shaft of the gear reduction box is a worm shaft, and a transmission part meshed and matched with the worm shaft is arranged in the sliding block.

3. The picture position adjusting structure for projection equipment as claimed in claim 2, wherein a plurality of second guide posts are arranged between the guide block and the driving device, a guide platform which is in sliding fit with the second guide posts is arranged at the end part of the slide block, and the guide platform moves along the axial direction of the second guide posts when the driving device drives the slide block to move.

4. The picture position adjusting structure for projection equipment as claimed in claim 3, wherein the moving plate is provided with a plurality of third guide posts, the fixing plate is provided with through holes matched with the third guide posts, and one ends of the third guide posts penetrate through the through holes of the fixing plate and slide along the through holes under the driving of the moving plate.

5. The picture position adjusting structure for projection apparatus according to claim 4, wherein an elastic buffer member is sleeved at one end of the third guide post penetrating through the fixing plate, a limit ring is arranged at the end of the third guide post, one end of the elastic buffer member is fixed with the fixing plate, and the other end of the elastic buffer member is fixed with the limit ring.

6. The picture position adjusting structure for projection equipment as claimed in claim 5, wherein the guide platform is a square guide platform, and two second guide posts are penetrated at opposite corners of the guide platform; the fixing plate is a square fixing plate, and four third guide posts penetrate through four corners of the fixing plate.

7. The picture position adjustment structure for a projection apparatus according to claim 5, wherein the elastic buffer is a compression spring.

8. The picture position adjustment structure for a projection apparatus according to claim 6, further comprising a circuit board assembly including a circuit board fixed to one side of the guide block and two channel-shaped photo-interrupt sensors connected to the circuit board; the guide platform is provided with a bulge corresponding to the light interruption sensor.

9. The screen position adjusting structure for a projection apparatus according to claim 8, wherein a bracket for mounting the circuit board and the photo interrupter sensor is provided on the guide block, the bracket including a bottom plate fixed to the guide block and a side plate formed by bending upward from one side of the bottom plate, the circuit board being provided on the outside of the side plate, two photo interrupters being provided on the upper and lower ends of the inside of the side plate; the slider passes through the bottom plate.

10. The picture position adjusting structure for projection apparatus according to claim 9, wherein the shape of the base plate is adapted to the upper end of the guide block, and the base plate, the guide block and the fixing plate are provided with fitting holes, and the base plate and the guide block are simultaneously mounted to the fixing plate by means of fasteners.