远像光屏

Abstract

本实用新型涉及一种远像光屏，所述远像光屏包括：支撑架，其包括方形支撑框；分光镜；第一反射镜，位于第二竖向面的内壁上，以及控制平板，固定于顶面的内壁面上，并且控制平板在其朝向底面的表面上形成有位于中央的中央区和位于周边的控制区，中央区为黑色涂布区域，控制区包括多个控制子单元，多个控制子单元中的至少一部分包括位于中央的第一透镜以及环绕第一透镜且与第一透镜贴合的多个第二透镜，第一透镜和第二透镜具有正多边形面型，第一透镜也为黑色涂布区域，第二透镜具有漫反射结构或镜面反射结构，控制平板中的控制区的表面积与控制平板的表面积的比值在12％至30％之间。

Claims

1. A far-image optical screen, the far-image optical screen comprising: A support frame includes a base, a support rod fixed to the base, and a square support frame movably fixed to the top of the support rod. The square support frame has a bottom surface, a top surface, and a first vertical surface and a second vertical surface intersecting the bottom surface. The bottom surface and the first vertical surface are open. The first vertical surface faces away from the support rod, and the first vertical surface and the second vertical surface face each other. A beam splitter is located inside the square support frame and is arranged at an angle; A first reflecting mirror is located on the inner wall of one of the second vertical surface and the top surface. This first reflecting mirror is a curved mirror, allowing light to travel along the optical path of the beam splitter, the first reflecting mirror, and the beam splitter before entering the user's eye, thus forming a distant image of the reading material placed below the square support frame. The feature is that the far-image screen further includes: A control plate is fixed to the inner wall of the other of the second vertical surface and the top surface. The control plate has a central area and a peripheral control area formed on its surface. The central area is a black-coated area. The control area includes multiple control sub-units. At least a portion of the multiple control sub-units includes a first lens located in the center and multiple second lenses surrounding and attached to the first lens. The first lens and the second lenses have regular polygonal surface shapes. The first lens is also a black-coated area. The second lenses have diffuse reflection or specular reflection structures. The ratio of the surface area of ​​the control area in the control plate to the surface area of ​​the control plate is between 12% and 35%.

2. The telecentric light screen of claim 1, wherein, At least a portion of the boundary between the control area and the central area is defined by alternating first and second lenses.

3. The far field optical screen of claim 1, wherein, The control panel is detachably fixed to the corresponding inner wall.

4. The far field optical screen according to claim 3, wherein, The control panel is detachably fixed to the corresponding inner wall by at least one of Velcro or magnetic blocks.

5. The far field optical screen according to any one of claims 1-4, wherein, Viewed vertically, the main body of the top surface of the square support frame is an isosceles trapezoid, and the upper base of the isosceles trapezoid is adjacent to the first vertical surface.

6. The telecentric light screen of claim 5, wherein, The angle between the upper base and the legs of the isosceles trapezoid is taken from any value within the range of 93°-98°, and the height of the isosceles trapezoid is taken from any value within the range of 200mm-300mm.

7. The far field optical screen of claim 1, wherein, The square support frame also includes a third vertical surface and a fourth vertical surface that are opposite to each other. The third vertical surface and the fourth vertical surface intersect with the bottom surface and the top surface. The inner wall surfaces of the third vertical surface and the fourth vertical surface are black-coated areas.

8. The far field optical screen of claim 1, wherein, The far-image screen also includes a de-reflective film that can cover the beam splitter.

9. The far field optical screen according to any one of claims 1-4, wherein, The square support frame includes an upper frame and a lower frame that can be detached and assembled with each other. The lower frame has an inner stepped groove and an outer stepped groove formed on its inner and outer sides in the wall thickness direction, respectively. The upper frame has a boss on its outer side in the wall thickness direction that matches the outer stepped groove. The inner stepped groove of the lower frame is used to support the beam splitter. When the square support frame is assembled, the upper and lower surfaces of the outer edge of the beam splitter abut against the inner side of the upper frame and the inner stepped groove of the lower frame, respectively.

10. The far field light screen of claim 9, wherein, At least one of the inner step groove and the outer step groove extends in a U-shape in the circumferential direction of the square support frame.

11. The far field light screen of claim 10, wherein, A lower step groove connected to the inner step groove is formed on the bottom surface of the square support frame. The beam splitter can abut against the lower step groove. The inner step groove and the lower step groove are combined to form an annular step groove.

12. The far field optical screen of claim 1, wherein, The base includes an arc-shaped plate.

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