Front Fresnel lens adjusting mechanism of projector

Abstract

The utility model provides a front Fresnel lens adjusting mechanism of a projector, belongs to the technical field of projectors, and solves the technical problems that the existing adjusting capability is not comprehensive, the multi-angle projection angle cannot be realized, and the light emitting effect is influenced. A front Fresnel lens adjusting mechanism of a projector comprises a projector rack, a base fixed in the projector rack, and a pair of mounting arms arranged on the base, and is characterized in that a front Fresnel lens is rotatably connected between the two mounting arms, and an adjusting assembly I for controlling the front Fresnel lens to rotate around a Z axis is arranged in the base; and an adjusting assembly II for controlling the front Fresnel lens to rotate around the Y axis is arranged on the mounting arm. The front Fresnel lens has the advantages that the front Fresnel lens can be adjusted at multiple angles, and the light emitting effect and the projection angle are improved.

Description

Technical Field

[0001] This utility model belongs to the field of projector technology, and relates to a front lens adjustment mechanism, particularly a front lens adjustment mechanism for a projector. Background Technology

[0002] A projector is a device that projects images or videos onto a screen. Existing projectors generally consist of several parts: a light source, a rear Fresnel lens (mainly used to adjust the uniformity of light), an LCD screen, a front Fresnel lens (mainly used to adjust the light output angle and projection angle trapezoidal of the LCD screen), and a lens assembly.

[0003] A search revealed that Chinese patent documents disclose a front lens adjustment mechanism for a projector and the projector thereof [Application No.: 202222540335.5; Publication No.: CN 218413179U]. A front focal length lens adjustment mechanism for a projector and the projector thereof are disclosed. The adjustment mechanism includes a rotating adjustment component, a connecting component, and a front focal length lens, all located at the rear end of a lens assembly and rotating about the axis of the lens assembly. The rotating adjustment component is connected to the front focal length lens via the connecting component. The rotating surface of the rotating adjustment component is parallel to the transmission surface of the front focal length lens. An adjustment lug, shaped like the number "7," is provided on the rotating adjustment component. A through hole is provided at the free end of the adjustment lug. The connecting component includes a first connecting rod and a second connecting rod. The first connecting rod includes a head and a tail, which form an arc shape. The head is hinged to the second connecting rod via a first hinge portion, and the second connecting rod is hinged to the front focal length lens via a second hinge portion. The front focal length lens is pivotally connected to a housing via pivots located at the center of both sides. The tail of the first connecting rod has a circular cross-section and extends outward through the through hole, the diameter of which is larger than the diameter of the tail. A fulcrum for pivotal connection with the housing is provided in the middle of the first connecting rod. This invention has the advantages of low cost and ease of market promotion.

[0004] Although this patent has the advantages of low cost and easy market promotion, it can only control the front lens to rotate around the Y-axis and cannot rotate and tilt around the Z-axis. This makes the adjustment capability incomplete and unable to project at multiple angles, thus affecting the light output effect. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a front lens adjustment mechanism for a projector. The technical problem this invention aims to solve is: how to enable the front lens to be adjusted at multiple angles, thereby improving the light output effect and projection angle.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A front lens adjustment mechanism for a projector includes a projector frame, a base fixed inside the projector frame, and a pair of mounting arms disposed on the base. The front lens is rotatably connected between the two mounting arms, and the base is provided with an adjustment component one for controlling the front lens to rotate around the Z-axis, and the mounting arms are provided with an adjustment component two for controlling the front lens to rotate around the Y-axis.

[0008] The working principle of this utility model is as follows: the front fringing mirror can be controlled to rotate around the Z-axis by the first control component, thereby achieving the purpose of adjusting the light output angle and projection angle trapezoid of the LCD screen. Then, the front fringing mirror can be controlled to rotate around the Y-axis by the second control component, further improving the angle adjustment capability of the front fringing mirror. Through the cooperation of the first and second control components, the front fringing mirror can complete the adjustment work at multiple angles, improving the light output effect and projection angle.

[0009] The base has an adjustment cavity, and a turntable is rotatably connected inside the adjustment cavity. The top surface of the turntable is fixedly connected to the bottom end of the two mounting arms.

[0010] With the above structure, the rotation of the two mounting arms can be achieved through a turntable, thereby further enabling the front lens to rotate around the Z-axis.

[0011] The adjustment assembly includes an adjustment frame fixed on the base, a worm gear rotatably connected inside the adjustment frame, a worm wheel rotatably connected inside the adjustment frame, a take-up wheel coaxially fixed on the worm wheel, the worm gear meshing with the worm wheel, and a pull rope fixed on the take-up wheel. One end of the pull rope is fixedly connected to the bottom end of one of the mounting arms, and an adjustment wheel is provided outside the projector frame, the adjustment wheel being coaxially fixedly connected to the worm gear.

[0012] With the above structure, the worm gear can be rotated by the adjustment wheel, which in turn drives the worm wheel to rotate, which in turn drives the corresponding winding wheel to rotate. The winding wheel then winds up the pull rope, which in turn pulls one of the mounting arms, causing the turntable to rotate, thereby changing the projection angle of the front view mirror.

[0013] The second adjustment component includes a first bevel gear rotatably connected within one of the mounting arms and a second bevel gear rotatably connected within one of the mounting arms. The first bevel gear is coaxially fixedly connected to the front mirror. An adjustment rod is rotatably connected to one of the mounting arms, and the bottom end of the adjustment rod is coaxially fixedly connected to the second bevel gear. An arc-shaped groove is provided on the projector frame, and the adjustment rod slides into the arc-shaped groove. An adjustment wheel is provided on the projector frame, and the adjustment wheel is coaxially fixedly connected to the adjustment rod.

[0014] With the above structure, the control lever can be rotated by the second control wheel. After the control lever rotates, it will drive the second bevel gear to rotate. After the second bevel gear rotates, it will drive the first bevel gear to rotate. After the first bevel gear rotates, it will drive the front mirror to rotate around the Y-axis.

[0015] One end of a coil spring is fixedly connected to the bottom axis of the turntable, and the other end of the coil spring is fixedly connected to the wall of the adjustment cavity.

[0016] With the above structure, the turntable can be pushed by a coil spring, so that the turntable will always return to the starting position without external force restriction, which facilitates the resetting of the front lens and improves the overall smoothness and efficiency of operation.

[0017] Compared with existing technologies, the front lens adjustment mechanism of this projector has the following advantages:

[0018] 1. The front Fresnel lens is controlled to rotate around the Z-axis by the first control component, thereby adjusting the light output angle and projection angle trapezoid of the LCD screen. Then, the front Fresnel lens is controlled to rotate around the Y-axis by the second control component, further improving the angle adjustment capability of the front Fresnel lens. By cooperating with the first and second control components, the front Fresnel lens can complete the adjustment work in all directions and at multiple angles, improving the light output effect and projection angle.

[0019] 2. The turntable is driven by a coil spring, so that it will always return to the starting position without external force, which facilitates the reset of the front mirror and improves the overall smoothness and efficiency of operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the main structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the mounting arm in this utility model.

[0023] Figure 4 This is a schematic diagram of the internal structure of the base in this utility model.

[0024] In the diagram, 1. Projector frame; 2. Base; 3. Mounting arm; 4. Front mirror; 5. Adjustment chamber; 6. Turntable; 7. Adjustment frame; 8. Worm gear; 9. Worm wheel; 10. Winding wheel; 11. Pull rope; 12. Control wheel one; 13. Bevel gear one; 14. Bevel gear two; 15. Control rod; 16. Arc groove; 17. Control wheel two; 18. Coil spring. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figures 1-4 As shown, a front lens 4 adjustment mechanism for a projector includes a projector frame 1, a base 2 fixed inside the projector frame 1, and a pair of mounting arms 3 disposed on the base 2. The front lens 4 is rotatably connected between the two mounting arms 3, and an adjustment component one for controlling the front lens 4 to rotate around the Z-axis is disposed inside the base 2, and an adjustment component two for controlling the front lens 4 to rotate around the Y-axis is disposed on the mounting arms 3.

[0027] The front favone mirror 4 can be rotated around the Z-axis by the first control component, thereby adjusting the light output angle and projection angle trapezoid of the LCD screen. The front favone mirror 4 can be rotated around the Y-axis by the second control component, further improving the angle adjustment capability of the front favone mirror 4. By cooperating with the first control component and the second control component, the front favone mirror 4 can complete the adjustment work at multiple angles, improving the light output effect and projection angle.

[0028] An adjustment cavity 5 is provided inside the base 2, and a turntable 6 is rotatably connected inside the adjustment cavity 5. The top surface of the turntable 6 is fixedly connected to the bottom end of the two mounting arms 3.

[0029] With the above structure, the rotation of the two mounting arms 3 can be achieved through the turntable 6, thereby further enabling the front mirror 4 to rotate around the Z-axis.

[0030] The adjustment assembly includes an adjustment frame 7 fixed on the base 2, a worm gear 8 rotatably connected inside the adjustment frame 7, a worm wheel 9 rotatably connected inside the adjustment frame 7, a take-up wheel 10 coaxially fixed on the worm wheel 9, the worm gear 8 meshing with the worm wheel 9, and a pull rope 11 fixed on the take-up wheel 10. One end of the pull rope 11 is fixedly connected to the bottom end of one of the mounting arms 3, and an adjustment wheel 12 is provided outside the projector frame 1, which is coaxially fixedly connected to the worm gear 8.

[0031] Using the above structure, the worm gear 8 can be rotated by the adjustment wheel 12. After the worm gear 8 rotates, it will drive the worm wheel 9 to rotate. After the worm wheel 9 rotates, it will drive the corresponding winding wheel 10 to rotate. After the winding wheel 10 rotates, it will wind up the pull rope 11, so that the pull rope 11 will further pull one of the mounting arms 3, causing the turntable 6 to rotate, thereby changing the projection angle of the front mirror 4.

[0032] The second adjustment assembly includes a first bevel gear 13 rotatably connected within one of the mounting arms 3 and a second bevel gear 14 rotatably connected within one of the mounting arms 3. The first bevel gear 13 is coaxially fixedly connected to the front mirror 4. An adjustment rod 15 is rotatably connected to one of the mounting arms 3, and the bottom end of the adjustment rod 15 is coaxially fixedly connected to the second bevel gear 14. An arc-shaped groove 16 is provided on the projector frame 1, and the adjustment rod 15 slides into the arc-shaped groove 16. An adjustment wheel 17 is provided on the projector frame 1, and the adjustment wheel 17 is coaxially fixedly connected to the adjustment rod 15.

[0033] With the above structure, the control rod 15 can be rotated by the control wheel 17. After the control rod 15 rotates, it will drive the bevel gear 14 to rotate. After the bevel gear 14 rotates, it will drive the bevel gear 13 to rotate. After the bevel gear 13 rotates, it will drive the front mirror 4 to rotate around the Y-axis.

[0034] One end of a coil spring 18 is fixedly connected to the bottom axis of the turntable 6, and the other end of the coil spring 18 is fixedly connected to the cavity wall of the adjustment cavity 5.

[0035] With the above structure, the turntable 6 can be pushed by the coil spring 18, so that the turntable 6 will always return to the starting position without external force restriction, which facilitates the reset of the front mirror 4 and improves the overall smoothness and efficiency of operation.

[0036] The working principle of this utility model is as follows: The first adjustment wheel 12 drives the worm gear 8 to rotate, which in turn drives the worm wheel 9 to rotate. The worm wheel 9 then drives the corresponding winding wheel 10 to rotate, which in turn winds up the pull rope 11. This pull rope 11 further pulls one of the mounting arms 3, causing the turntable 6 to rotate. The turntable 6 enables the rotation of both mounting arms 3, thereby further enabling the front lens 4 to rotate around the Z-axis. The second adjustment wheel 17 drives the adjustment rod 15 to rotate, which in turn drives the bevel gear 14 to rotate. The bevel gear 14 then drives the bevel gear 13 to rotate, which in turn drives the front lens 4 to rotate around the Y-axis. Through the combination of these two rotation methods, the front lens 4 can complete the adjustment work in all directions and at multiple angles, improving the light output effect and projection angle.

[0037] In summary, by controlling the front favism lens 4 to rotate around the Z-axis using control component one, the light emission angle and projection angle trapezoidal of the LCD screen can be adjusted. Then, by controlling the front favism lens 4 to rotate around the Y-axis using control component two, the angle adjustment capability of the front favism lens 4 can be further improved. Through the cooperation of control component one and control component two, the front favism lens 4 can complete the adjustment work in all directions and at multiple angles, thereby improving the light emission effect and projection angle.

[0038] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A front lens (4) adjustment mechanism for a projector, comprising a projector frame (1), a base (2) fixed inside the projector frame (1), and a pair of mounting arms (3) disposed on the base (2), characterized in that, A front lens (4) is rotatably connected between the two mounting arms (3), and an adjustment component one for controlling the front lens (4) to rotate around the Z-axis is provided in the base (2), and an adjustment component two for controlling the front lens (4) to rotate around the Y-axis is provided on the mounting arms (3).

2. The front lens (4) adjustment mechanism of a projector according to claim 1, characterized in that, An adjustment cavity (5) is provided inside the base (2), and a turntable (6) is rotatably connected inside the adjustment cavity (5). The top surface of the turntable (6) is fixedly connected to the bottom end of the two mounting arms (3).

3. The front lens (4) adjustment mechanism of a projector according to claim 1, characterized in that, The adjustment assembly includes an adjustment frame (7) fixed on the base (2), a worm gear (8) rotatably connected inside the adjustment frame (7), a worm wheel (9) rotatably connected inside the adjustment frame (7), a winding wheel (10) coaxially fixed on the worm wheel (9), the worm gear (8) meshing with the worm wheel (9), and a pull rope (11) fixed on the winding wheel (10). One end of the pull rope (11) is fixedly connected to the bottom end of one of the mounting arms (3), and an adjustment wheel (12) is provided outside the projector frame (1). The adjustment wheel (12) is coaxially fixedly connected to the worm gear (8).

4. The front lens (4) adjustment mechanism of a projector according to claim 1, characterized in that, The second adjustment component includes a bevel gear 1 (13) rotatably connected in one of the mounting arms (3) and a bevel gear 2 (14) rotatably connected in one of the mounting arms (3). The bevel gear 1 (13) is coaxially fixedly connected to the front mirror (4). An adjustment rod (15) is rotatably connected on one of the mounting arms (3), and the bottom end of the adjustment rod (15) is coaxially fixedly connected to the bevel gear 2 (14). An arc groove (16) is provided on the projector frame (1), and the adjustment rod (15) slides with the arc groove (16). An adjustment wheel 2 (17) is provided on the projector frame (1), and the adjustment wheel 2 (17) is coaxially fixedly connected to the adjustment rod (15).

5. The front lens (4) adjustment mechanism of a projector according to claim 2, characterized in that, The bottom axis of the turntable (6) is fixedly connected to one end of a coil spring (18), and the other end of the coil spring (18) is fixedly connected to the cavity wall of the adjustment cavity (5).

Images