A projection optical engine and projector capable of flipping images by 90°

Abstract

The invention discloses a projection optical engine and a projector capable of flipping an image by 90 degrees, and mainly relates to the technical field of optical projection. The projector comprises a light source system, an X-prism, a relay system, an optical integrator rod, a first rotating mechanism for driving the optical integrator rod to rotate, a PBS prism, an LCos display screen, and a second rotating mechanism for driving the LCos display screen to rotate. The light emitted by the light source system enters the relay system after being emitted through the X-prism, and the light is transmitted and constrained by the relay system, and then converges at a certain angle to enter the optical integrator rod, and then is emitted through the optical integrator rod to form a rectangular light source. After the rectangular light source enters the PBS prism, P polarized light is transmitted, and S polarized light is reflected and irradiated on the LCos display screen. The invention can flip a horizontal picture by 90 degrees to realize vertical projection, and has a long service life and is convenient to adjust.

Description

Technical Field

[0001] The invention relates to the technical field of optical projection, and in particular to a projection optical engine and a projector capable of flipping an image by 90 degrees. Background Art

[0002] In many scenarios in the retail industry, digital signage with vertical display (usually 9:16) is required. There are two main ways for traditional projectors to display vertically. One is to use the vertical part of the horizontal screen to display the screen, and the rest of the screen is displayed in black. This not only wastes a lot of pixels and reduces the display resolution, but also the black field pixels are always in the off state and bear a large heat load. Long-term use is likely to damage the pixels; another way is to vertically hang the projector or install the projector on the side wall, but this method is limited by the use space and is not flexible enough. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the prior art and to provide a projection optical engine and a projector which can flip the image by 90°, and can flip the horizontal picture by 90° to achieve vertical projection, and has a long service life and is easy to adjust.

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

[0005] A projection optical engine capable of flipping an image by 90°, comprising a light source system, an X-prism, a relay system, an optical integrator rod and a first rotating mechanism for driving the optical integrator rod to rotate, a PBS prism, an LCos display screen and a second rotating mechanism for driving the LCos display screen to rotate;

[0006] The light emitted by the light source system is emitted through the X-prism and then enters the relay system. After being transmitted and constrained by the relay system, the light is converged at a certain angle and enters the optical integrator rod. After being emitted through the optical integrator rod, a rectangular light source is formed.

[0007] After the rectangular light source enters the PBS prism, the P polarized light is transmitted, and the S polarized light is reflected and irradiated on the LCos display screen.

[0008] Preferably, the light source system includes a blue light LED, a red light LED, and a green light LED, and the light emitted by the blue light LED, the red light LED, and the green light LED all enter the X-prism after passing through a corresponding collimation system.

[0009] Preferably, the collimation system is a collimating lens arranged between the blue light LED and the X-prism, between the red light LED and the X-prism, and between the green light LED and the X-prism.

[0010] Preferably, the relay system is a relay lens arranged between the X-prism and the optical integrator rod.

[0011] Preferably, a heat sink is provided on the LCos display screen.

[0012] Preferably, the first rotating mechanism includes a first motor, a first gear mounted on the first motor, a second gear meshing with the first gear, a bearing seat mounted on the housing of the optical engine, and a first limit switch, a first bearing is provided in the bearing seat, the second gear is fixed in the inner ring of the first bearing, a mounting hole adapted for the optical integrator rod is provided in the middle portion of the second gear, and the main optical axis of the optical integrator rod coincides with the axis center of the second gear and the first bearing.

[0013] Preferably, the second rotating mechanism includes a second motor, a third gear installed on the second motor, a rotating bracket, and a second limit switch. The LCos display is installed on the rotating bracket. The rotating bracket is rotatably connected to the housing of the optical engine through a second bearing, and meshing teeth that mesh with the third gear are provided on the rotating bracket.

[0014] Preferably, the radiator is mounted on the rotating bracket via a shoulder screw, a spring is sleeved on the shoulder screw, and the spring is located on a side of the radiator away from the rotating bracket.

[0015] A projector adopts the above-mentioned projection optical engine capable of flipping an image by 90 degrees.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The light emitted by the light source system of the present invention enters the relay system after being emitted through the X prism. After being transmitted and constrained by the relay system, the light is converged at a certain angle and enters the optical integrator rod. After being emitted through the optical integrator rod, a rectangular light source is formed. The optical integrator rod has the function of homogenizing and shaping the light source. The light is reflected several times inside it and forms a rectangular uniform light source of a specific proportion after being emitted. The rectangular light source enters the PBS prism, and its P polarized light is transmitted, and the S polarized light is reflected and irradiated on the LCos display screen. The rectangular light source has a certain overflow size relative to the LCos display screen, ensuring that the illumination light source can cover the entire LCos display screen. display screen; the light source can be modulated by LCos, and the bright state enters the lens through PBS in the form of P light emission, and finally presents the picture; if you want to flip the image 90°, just rotate the shaping optical device and the image modulator 90° along the optical axis of the main light. The optical integrator rod is used as a shaping optical device. After rotating 90°, the rectangular light source at the rear end follows the rotation; the LCos display screen rotates 90° to be consistent with the length and width of the rectangular light source, and can modulate the image after rotating 90°, and can flip the horizontal picture (16:9) 90° to achieve vertical projection (9:16). It has a long service life and is easy to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1is a diagram of the optical engine architecture of the present invention;

[0019] Attached Figure 2 is a structural schematic diagram of a first rotating mechanism;

[0020] Attached Figure 3 It is a structural schematic diagram of the second rotating mechanism.

[0021] Numbers in the accompanying drawings: 1. X-prism; 2. Relay system; 3. Optical integrator rod; 4. PBS prism; 5. LCos display; 6. Lens; 61. Blue LED; 62. Red LED; 63. Green LED; 64. Collimation system; 7. Radiator; 71. Shoulder screw; 72. Spring; 81. First motor; 82. First gear; 83. Second gear; 84. Bearing seat; 85. First limit switch; 9. Housing; 91. Second motor; 92. Third gear; 93. Rotating bracket; 94. Meshing teeth; 95. Sealing gasket; 96. PCB board. DETAILED DESCRIPTION

[0022] 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.

[0023] Embodiment 1: As attached Figure 1-3 As shown, the present invention is a projection optical engine capable of flipping an image by 90°, comprising a light source system, an X-prism 1, a relay system 2, an optical integrator rod 3 and a first rotating mechanism for driving the optical integrator rod 3 to rotate, a PBS prism 4, an LCos display screen 5 and a second rotating mechanism for driving the LCos display screen 5 to rotate;

[0024] Specifically, the light source system includes a blue LED 61, a red LED 62, and a green LED 63, as shown in the attached Figure 1 As shown, the blue light LED 61 can be set on the left side of the X-prism 1, the red light LED 62 is set on the lower side of the X-prism 1, and the green light LED 63 is set on the upper side of the X-prism 1. The collimation system 64 is a collimating lens arranged between the blue light LED 61 and the X-prism 1, between the red light LED 62 and the X-prism 1, and between the green light LED 63 and the X-prism 1. Collimating lenses are provided between the blue light LED 61 and the X-prism 1, between the red light LED 62 and the X-prism 1, and between the green light LED 63 and the X-prism 1. The blue light LED 61, the red light LED 62, and the green light LED 63 pass through the collimation system to realize parallel light entering the X-prism 1. The function of the X-prism 1 is to realize the light combination of the three-color LEDs (blue light transmission, red and green light reflection).

[0025] The relay system 2 is a relay lens disposed between the X-prism 1 and the optical integrator rod 3 .

[0026] The LCos display screen 5 is provided with a heat sink 7 .

[0027] The three LEDs pass through the collimation system 64 to achieve parallel light entering the X prism 1. After being emitted from the X prism 1, the light enters the relay system 2, where it is transmitted and constrained, and then converges at a certain angle into the optical integrator rod 3. The function of the optical integrator rod 3 is to homogenize and shape the light source. The light is reflected several times inside it, and a rectangular uniform light source of a specific proportion is formed after being emitted. The rectangular light source enters the PBS prism 4, and its P polarized light passes through, and the S polarized light is reflected and irradiated on the LCos display screen 5. The rectangular light source has a certain overflow size relative to the LCos display screen 5, ensuring that the illumination light source can cover the entire LCos display screen 5. The light source can be modulated by LCos, and the bright state passes through the PBS prism 4 in the form of P light emission to enter the lens 6, and finally presents the picture. If the image is to be flipped 90°, the shaping optical device and the image modulator can be rotated 90° along the optical axis of the main light. The optical integrator rod 3 is used as a shaping optical device. After rotating 90°, the rear rectangular light source follows the rotation. The LCos display screen 5 is used as an image modulator. After rotating 90°, it can be consistent with the length and width direction of the rectangular light source, and can also modulate the image after rotating 90°.

[0028] The invention can flip a horizontal picture (16:9) by 90 degrees to realize vertical projection (9:16), has a long service life, and is easy to adjust.

[0029] Preferably, as attached Figure 2The first rotating mechanism includes a first motor 81, a first gear 82 mounted on the first motor 81, a second gear 83 meshing with the first gear 82, a bearing seat 84 mounted on the housing of the optical engine, and a first limit switch 85. The bearing seat 84 is provided with a first bearing, the second gear 83 is fixed in the inner ring of the first bearing, the middle part of the second gear 83 is provided with a mounting hole adapted to the optical integrator rod 3, the main optical axis of the optical integrator rod 3 coincides with the axis of the second gear 83 and the first bearing, the shape of the optical integrator rod 3 is a rectangular parallelepiped, the mounting hole is a square hole, and the optical integrator rod 3 is mounted on the second In the square hole in the middle of the gear 83, the first bearing adopts a precision bearing, and one end of the second gear 83 is provided with a rotating shaft integrated with the gear, and the rotating shaft is fixed in the inner ring of the first bearing. The first bearing is installed in the bearing seat 84, and the bearing seat 84 is fixed on the housing of the optical engine. The above parts need to be precisely processed so that the main optical axis of the optical integrator rod 3 coincides with the axis of the gear and the bearing. When the first motor 81 drives the gear pair to engage and rotate, the optical integrator rod 3 will rotate with the rotation of the second gear 83. When the optical integrator rod 3 rotates to the extreme position of 90°, it will contact the first limit switch 85, and the power supply of the first motor 81 will be disconnected.

[0030] Preferably, as attached Figure 3 The second rotating mechanism includes a second motor 91, a third gear 92 mounted on the second motor 91, a rotating bracket 93, and a second limit switch. The LCos display screen 5 is mounted on the rotating bracket 93. The rotating bracket 93 is rotatably connected to the housing of the optical engine through a second bearing. A meshing tooth 94 meshing with the third gear 92 is provided on the rotating bracket 93. The second bearing can be a precision bearing. The housing 9 of the optical engine is used as a fixed reference. The housing 9 is fixed to the outer ring of the second bearing, and the inner ring of the second bearing is fixed to the rotating bracket 93. A meshing tooth 94 is provided on the upper part of the rotating bracket 93. The meshing tooth 94 meshes with the third gear 92. When the second motor 91 is working, the meshing movement of the gear pair will cause the rotation The components fixed on the bracket 93 rotate around the center of the LCos display screen 5. When the LCos display screen 5 rotates to a predetermined vertical position, the second limit switch is triggered to prevent the components from continuing to rotate. Furthermore, in order to ensure that the LCos display screen and the radiator can fit well and ensure the heat dissipation performance, the radiator 7 is installed on the rotating bracket 93 through a shoulder screw 71. A spring 72 is sleeved on the shoulder screw 71. The spring 72 is located on the side of the radiator 7 away from the rotating bracket 93. The radiator 7, the LCos display screen 5, the PCB board 96, and the sealing gasket 95 are pressed onto the rotating bracket 93 through the shoulder screw 71 with the spring 72. In this way, when the rotating bracket 93 rotates, the LCos display screen 5 can rotate synchronously with the radiator 7.

[0031] Embodiment 2: The present invention is a projector, the optical engine of which adopts the projection optical engine capable of flipping an image by 90° in Embodiment 1.

Claims

1. A projection optical engine capable of flipping an image by 90°, characterized in that: It comprises a light source system, an X-prism (1), a relay system (2), an optical integrator rod (3), and a first rotating mechanism for driving the optical integrator rod (3) to rotate, a PBS prism (4), an LCos display screen (5), and a second rotating mechanism for driving the LCos display screen (5) to rotate; The light emitted by the light source system is emitted from the X-prism (1) and then enters the relay system (2). After being transmitted and constrained by the relay system (2), the light is converged at a certain angle and enters the optical integrator rod (3). After being emitted from the optical integrator rod (3), a rectangular light source is formed. After the rectangular light source enters the PBS prism (4), the P polarized light is transmitted, and the S polarized light is reflected and irradiated onto the LCos display screen (5); The LCos display screen (5) is provided with a heat sink (7); The first rotating mechanism comprises a first motor (81), a first gear (82) mounted on the first motor (81), a second gear (83) meshing with the first gear (82), a bearing seat (84) mounted on a housing of the optical engine, and a first limit switch (85); a first bearing is arranged in the bearing seat (84); the second gear (83) is fixed in the inner ring of the first bearing; a mounting hole adapted to the optical integrator rod (3) is arranged in the middle of the second gear (83); the main optical axis of the optical integrator rod (3) coincides with the axis of the second gear (83) and the first bearing; The second rotating mechanism includes a second motor (91), a third gear (92) mounted on the second motor (91), a rotating bracket (93), and a second limit switch. The LCos display screen (5) is mounted on the rotating bracket (93). The rotating bracket (93) is rotatably connected to the housing of the optical engine via a second bearing. The rotating bracket (93) is provided with meshing teeth (94) that mesh with the third gear (92).

2. The projection optical engine capable of flipping an image by 90° according to claim 1, characterized in that: The light source system comprises a blue light LED (61), a red light LED (62), and a green light LED (63); light rays emitted by the blue light LED (61), the red light LED (62), and the green light LED (63) all pass through corresponding collimation systems (64) and then enter the X-prism (1).

3. The projection optical engine capable of flipping an image by 90° according to claim 2, characterized in that: The collimation system (64) is a collimation lens arranged between the blue light LED (61) and the X-prism (1), between the red light LED (62) and the X-prism (1), and between the green light LED (63) and the X-prism (1).

4. The projection optical engine capable of flipping an image by 90° according to claim 1, characterized in that: The relay system (2) is a relay lens arranged between the X-prism (1) and the optical integrator rod (3).

5. The projection optical engine capable of flipping an image by 90° according to claim 1, characterized in that: The radiator (7) is mounted on the rotating bracket (93) via a shoulder screw (71); a spring (72) is sleeved on the shoulder screw (71); and the spring (72) is located on a side of the radiator (7) away from the rotating bracket (93).

6. A projector, characterized in that: A projection optical engine capable of flipping an image by 90° as described in any one of claims 1 to 5 is adopted.

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