Device and method for adjusting projection image offset

Abstract

The invention discloses a device for adjusting the offset of a projection image and a method for using the device, which mainly relates to the field of projection display technology; the device comprises: a light-transmitting plane mirror, which is arranged between a projection display chip and a projection lens; a tilt adjustment mechanism, on which the plane mirror is mounted, and on which an X-axis rotating mechanism for driving the plane mirror to rotate around an X-axis and a Y-axis rotating mechanism for driving the plane mirror to rotate around a Y-axis are arranged; the invention adds a plane mirror between the projection display chip and the projection lens, and by changing the tilt angle of the plane mirror, the upward, downward, leftward and rightward offsets of the overall projection image are achieved, the operation is simple, the image quality can be guaranteed, and the stability and firmness of the lens can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of projection display technology, and in particular to a device for adjusting the offset of a projection image and a method for using the device. Background Art

[0002] At present, in the field of projection display, the height and horizontal position between the projection screen and the projector must be guaranteed to be a specified distance to ensure that the edge of the projected image coincides with the edge of the screen. Especially in the field of ultra-short-throw projection, it is difficult to ensure the specified distance between the projector and the screen. The four corners are often adjusted by software, which sacrifices the image quality; or the height of the projector is adjusted by foot, which increases the difficulty of operation for users. Some current methods of changing the optical path of the projector are to change the height between the projection lens and the display chip as a whole, which will affect the stability and firmness of the lens. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the prior art and provide a device and a method for adjusting the offset of a projection image. A plane mirror is added between a projection display chip and a projection lens. By changing the inclination angle of the plane mirror, the upward, downward, leftward and rightward offset of the overall projection image is achieved. The operation is simple, the image quality can be guaranteed, and the stability and firmness of the lens can be guaranteed.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A device for adjusting a projection image offset, comprising:

[0006] A light-transmitting plane mirror, wherein the plane mirror is arranged between the projection display chip and the projection lens;

[0007] The tilt adjustment mechanism is provided with an X-axis rotation mechanism for driving the plane mirror to rotate around an X-axis and a Y-axis rotation mechanism for driving the plane mirror to rotate around a Y-axis.

[0008] Preferably, the X-axis rotation mechanism includes an X-axis motor and an X-axis rotation frame. The X-axis rotation frame is rotatably connected to the optical machine housing via a horizontal support shaft. The X-axis motor is installed on the optical machine housing. The X-axis motor is used to drive the X-axis rotation frame to rotate around the horizontal support shaft.

[0009] Preferably, the Y-axis rotation mechanism includes a Y-axis motor and a Y-axis rotation frame, the Y-axis rotation frame is rotatably connected to the X-axis rotation frame via a vertical support shaft, the Y-axis motor is mounted on the X-axis rotation frame, the Y-axis motor is used to drive the Y-axis rotation frame to rotate around the vertical support shaft, and the plane mirror is mounted on the Y-axis rotation frame.

[0010] Preferably, the tilt adjustment mechanism is provided with an X-axis limiting mechanism for limiting the rotation angle of the plane mirror around the X-axis, and a Y-axis limiting mechanism for limiting the rotation angle of the plane mirror around the Y-axis.

[0011] Preferably, the X-axis limiting mechanism comprises a first limiting block fixed on the outer wall of the horizontal support shaft, and a first limiting groove adapted to the first limiting block is provided on the optical machine housing.

[0012] Preferably, the Y-axis limiting mechanism comprises a second limiting block fixed on the outer wall of the vertical support shaft, and a second limiting groove adapted to the second limiting block is provided on the X-axis rotating frame.

[0013] Preferably, the X-axis rotating frame and the Y-axis rotating frame both adopt rectangular frames, the Y-axis rotating frame is located on the inner side of the X-axis rotating frame, and the plane mirror is embedded on the inner side of the Y-axis rotating frame.

[0014] A method for using a device for adjusting a projection image offset:

[0015] When the projection image needs to be shifted up and down in the vertical direction, the plane mirror is driven to rotate by the X-axis rotation mechanism. When the X-axis rotation mechanism rotates forward, the projection image shifts upward; when the X-axis rotation mechanism rotates reversely, the projection image shifts downward.

[0016] When the projection image needs to be shifted left or right in the horizontal direction, the plane mirror is driven to rotate by the Y-axis rotation mechanism. When the Y-axis rotation mechanism rotates forward, the projection image shifts to the right; when the Y-axis rotation mechanism rotates reversely, the projection image shifts to the left.

[0017] The specific rotation angles of the X-axis rotation mechanism and the Y-axis rotation mechanism need to be determined according to the offset required for the projection image.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The present invention adds a plane mirror between the projection display chip and the projection lens. When the light on the projection display chip passes through the plane mirror, the plane mirror is tilted at a certain angle in the horizontal and vertical directions, causing the light to deviate by a certain small distance in the horizontal and vertical directions. Through the image magnification effect of the projection lens, the small distance deviation of the light is converted into the overall horizontal and vertical movement of the projection image, thereby realizing the up, down, left, and right deviation of the overall projection image. The operation is simple, and the image quality can be guaranteed, and the stability and firmness of the lens can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Attached Figure 2 It is a schematic diagram of the principle of the present invention;

[0022] Attached Figure 3 It is a structural diagram of the X-axis limit mechanism;

[0023] Attached Figure 4 It is a structural diagram of the Y-axis limit mechanism.

[0024] Numbers in the attached drawings:

[0025] 1. Plane mirror; 2. Projection display chip; 3. Projection lens; 4. X-axis motor; 41. X-axis rotating frame; 42. Horizontal support shaft; 43. First limit block; 44. First limit slot; 5. Optical machine housing; 6. Y-axis motor; 61. Y-axis rotating frame; 62. Vertical support shaft; 63. Second limit block; 64. Second limit slot. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0027] Embodiment 1: As attached Figure 1-4 As shown, the present invention is a device for adjusting the offset of a projection image, comprising:

[0028] The plane mirror 1 is a light-transmitting plane mirror 1, which can be a high-transmittance plane mirror with a certain thickness. The plane mirror 1 is tilted and arranged between the projection display chip 2 and the projection lens 3. Figure 2 When the light on the projection display chip 2 passes through the inclined plane mirror 1, the plane mirror 1 is tilted at a certain angle in the horizontal and vertical directions, causing the light to deviate by a certain small distance in the horizontal and vertical directions. Through the image magnification effect of the projection lens 3, the small distance deviation of the light is converted into the overall horizontal and vertical movement of the projection image.

[0029] The plane mirror 1 is installed on the tilt adjustment mechanism, and the tilt adjustment mechanism is provided with an X-axis rotation mechanism for driving the plane mirror 1 to rotate around the X-axis and a Y-axis rotation mechanism for driving the plane mirror 1 to rotate around the Y-axis. The X-axis rotation mechanism and the Y-axis rotation mechanism can adopt a manual rotation structure or an automatic rotation mechanism.

[0030] The present invention adds a high-transmittance plane mirror 1 of a certain thickness between the projection display chip 2 and the projection lens 3, and changes the tilt angle of the plane mirror 1 through a tilt adjustment mechanism to achieve the up and down and left and right offset of the overall projection image. The operation is simple, and the image quality can be guaranteed, and the stability and firmness of the lens can be guaranteed.

[0031] Specifically, as attached Figure 1 , in the vertical plane, the horizontal direction is defined as the X-axis direction, and the vertical direction is defined as the Y-axis direction. The X-axis rotation mechanism includes an X-axis motor 4 and an X-axis rotating frame 41. The X-axis rotating frame 41 is rotatably connected to the optical machine housing 5 through a horizontal support shaft 42. A first mounting hole adapted to the horizontal support shaft 42 is provided on the optical machine housing 5, and a bearing adapted to the horizontal support shaft 42 can be provided in the first mounting hole. The horizontal support shaft 42 is fixed on the X-axis rotating frame 41. An integrated structure can be adopted between the X-axis rotating frame 41 and the horizontal support shaft 42. The X-axis motor 4 is installed on the optical machine housing 5 through a connecting piece. The X-axis motor 4 and the horizontal support shaft 42 are connected by a connecting sleeve. The X-axis motor 4 is used to drive the X-axis rotating frame 41 to rotate around the horizontal support shaft 42; the Y-axis rotation mechanism includes a Y-axis motor 6 and a Y-axis rotating frame 61. The Y-axis rotating frame 61 is rotatably connected to the X-axis rotating frame 41 through a vertical support shaft 62. The rotating frame 41 is rotatably connected, and a second mounting hole adapted to the vertical support shaft 62 is provided on the X-axis rotating frame 41, and a bearing adapted to the vertical support shaft 62 can be provided in the second mounting hole, and the vertical support shaft 62 is fixed on the Y-axis rotating frame 61, and an integrated structure can be adopted between the Y-axis rotating frame 61 and the vertical support shaft 62, and the Y-axis motor 6 is installed on the X-axis rotating frame 41 through a connecting piece, and the Y-axis motor 6 is transmission-connected to the vertical support shaft 62 through a connecting sleeve, and the Y-axis motor 6 is used to drive the Y-axis rotating frame 61 to rotate around the vertical support shaft 62, and the plane mirror 1 is embedded in the Y-axis rotating frame 61, and the X-axis motor 4 is used to drive the X-axis rotating frame 41 to rotate, and the self-locking of the X-axis motor 4 is used to fix the angle of the X-axis rotating frame 41, and the Y-axis motor 6 is used to drive the Y-axis rotating frame 61 to rotate, and the self-locking of the Y-axis motor 6 is used to fix the angle of the Y-axis rotating frame 61, thereby adjusting and fixing the angle of the plane mirror 1.

[0032] Preferably, in order to ensure the stability of the tilt adjustment mechanism, the X-axis rotating frame 41 and the Y-axis rotating frame 61 both adopt rectangular frames, the Y-axis rotating frame 61 is located on the inner side of the X-axis rotating frame 41, the plane mirror 1 is embedded in the inner side of the Y-axis rotating frame 61, the number of the horizontal support shaft 42 and the vertical support shaft 62 are both two, and the horizontal support shaft 42 is perpendicular to the vertical support shaft 62; the two horizontal support shafts 42 are respectively located at the left and right ends of the X-axis rotating frame 41, and one of the horizontal support shafts 42 is connected to the X-axis motor 4 through a connecting sleeve; the two vertical support shafts 62 are respectively located at the upper and lower ends of the Y-axis rotating frame 61, and one of the vertical support shafts 62 is connected to the Y-axis motor 6 through a connecting sleeve.

[0033] Preferably, in order to prevent the plane mirror from colliding with the lens due to excessive tilt angle, the tilt adjustment mechanism is provided with an X-axis limit mechanism for limiting the rotation angle of the plane mirror 1 around the X-axis, and a Y-axis limit mechanism for limiting the rotation angle of the plane mirror 1 around the Y-axis. Both the X-axis limit mechanism and the Y-axis limit mechanism can adopt limit switches, which are installed at the extreme position of rotation. The corresponding limit switches control the rotation of the X-axis motor 4 and the Y-axis motor 6 to control the rotation angle of the plane mirror 1.

[0034] Furthermore, in order to reduce production and maintenance costs, as shown in the attached Figure 3 As shown, the X-axis limiting mechanism includes a first limiting block 43 welded on the outer wall of the horizontal support shaft 42, and a first limiting groove 44 adapted to the first limiting block 43 is provided on the optical machine housing 5. The first limiting block 43 can only move in the first limiting groove 44, and the rotation angle of the plane mirror 1 around the X-axis is limited by limiting the moving position of the first limiting block 43; as shown in the attached Figure 4 As shown, the Y-axis limiting mechanism includes a second limiting block 63 welded on the outer wall of the vertical support shaft 62, and a second limiting groove 64 adapted to the second limiting block 63 is provided on the X-axis rotating frame 41. The second limiting block 63 can only move in the second limiting groove 64. The rotation angle of the plane mirror 1 around the Y-axis is limited by limiting the moving position of the second limiting block 63, and it can be used together with the limit switch for double protection.

[0035] Embodiment 2: A method for using a device for adjusting a projection image offset,

[0036] When the projection image needs to be shifted up and down in the vertical direction, the X-axis motor 4 is started. When the X-axis motor 4 rotates forward, the projection image shifts upward; when the X-axis motor 4 rotates reversely, the projection image shifts downward;

[0037] When the projection image needs to be shifted left and right in the horizontal direction, the Y-axis motor 6 is started. When the Y-axis motor 6 rotates in the forward direction, the projection image shifts to the right; when the Y-axis motor 6 rotates in the reverse direction, the projection image shifts to the left.

[0038] The specific rotation angles of the X-axis motor 4 and the Y-axis motor 6 need to be determined according to the offset required for the projection image. Meanwhile, the specific offset of the image caused by rotating a certain angle is also affected by the refractive index and thickness of the material of the plane mirror 1 .

Claims

1. A device for adjusting the offset of a projection image, characterized in that: include: A light-transmitting plane mirror (1), wherein the plane mirror (1) is arranged between a projection display chip (2) and a projection lens (3); A tilt adjustment mechanism, wherein the plane mirror (1) is mounted on the tilt adjustment mechanism, and the tilt adjustment mechanism is provided with an X-axis rotation mechanism for driving the plane mirror (1) to rotate around an X-axis, and a Y-axis rotation mechanism for driving the plane mirror (1) to rotate around a Y-axis; The tilt adjustment mechanism is provided with an X-axis limiting mechanism for limiting the rotation angle of the plane mirror (1) around the X-axis, and a Y-axis limiting mechanism for limiting the rotation angle of the plane mirror (1) around the Y-axis; The X-axis limiting mechanism comprises a first limiting block (43) fixed on the outer wall of the horizontal support shaft (42), and a first limiting groove (44) adapted to the first limiting block (43) is provided on the optical machine housing (5); The Y-axis limiting mechanism comprises a second limiting block (63) fixed on the outer wall of the vertical support shaft (62), and a second limiting groove (64) adapted to the second limiting block (63) is provided on the X-axis rotating frame (41).

2. The device for adjusting the offset of a projection image according to claim 1, characterized in that: The X-axis rotation mechanism comprises an X-axis motor (4) and an X-axis rotation frame (41); the X-axis rotation frame (41) is rotationally connected to the optical machine housing (5) via a horizontal support shaft (42); the X-axis motor (4) is mounted on the optical machine housing (5); and the X-axis motor (4) is used to drive the X-axis rotation frame (41) to rotate around the horizontal support shaft (42).

3. The device for adjusting the offset of a projection image according to claim 2, characterized in that: The Y-axis rotation mechanism comprises a Y-axis motor (6) and a Y-axis rotation frame (61); the Y-axis rotation frame (61) is rotationally connected to the X-axis rotation frame (41) via a vertical support shaft (62); the Y-axis motor (6) is mounted on the X-axis rotation frame (41); the Y-axis motor (6) is used to drive the Y-axis rotation frame (61) to rotate around the vertical support shaft (62); and the plane mirror (1) is mounted on the Y-axis rotation frame (61).

4. The device for adjusting the offset of a projection image according to claim 3, characterized in that: The X-axis rotating frame (41) and the Y-axis rotating frame (61) both adopt rectangular frames; the Y-axis rotating frame (61) is located on the inner side of the X-axis rotating frame (41); and the plane mirror (1) is embedded on the inner side of the Y-axis rotating frame (61).

5. A method for using the device for adjusting the offset of a projection image according to any one of claims 1 to 4, characterized in that: When the projection image needs to be shifted up and down in the vertical direction, the plane mirror (1) is driven to rotate by the X-axis rotation mechanism. When the X-axis rotation mechanism rotates in the forward direction, the projection image is shifted upward; when the X-axis rotation mechanism rotates in the reverse direction, the projection image is shifted downward. When the projection image needs to be shifted left or right in the horizontal direction, the plane mirror (1) is driven to rotate by the Y-axis rotation mechanism. When the Y-axis rotation mechanism rotates forward, the projection image shifts to the right; when the Y-axis rotation mechanism rotates backward, the projection image shifts to the left. The specific rotation angles of the X-axis rotation mechanism and the Y-axis rotation mechanism need to be determined according to the offset required for the projection image.

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