CN113296342B

CN113296342B - Optical projection system

Info

Publication number: CN113296342B
Application number: CN202110557043.XA
Authority: CN
Inventors: 杨建明
Original assignee: Guanggan Shanghai Technology Co ltd
Current assignee: Guanggan Shanghai Technology Co ltd
Priority date: 2021-05-21
Filing date: 2021-05-21
Publication date: 2024-03-12
Anticipated expiration: 2041-05-21
Also published as: CN113296342A

Abstract

An optical projection system relates to the technical field of projection display, and aims to solve the problems that an existing optical projection system is complex in projection lens, high in cost, difficult to assemble, difficult to seamlessly fuse images and the like due to the limitation of transmission angles in spherical screen projection, and comprises a rotating arc-shaped display screen, a concave reflecting mirror, a diaphragm and a spherical projection screen; the spherical projection screen, the spherical center of the concave reflector and the arc center of the rotating arc-shaped display screen are all positioned at the center of the diaphragm; after being reflected by the concave reflecting mirror, the light rays emitted by the rotary arc-shaped display screen pass through the position of the rotary arc-shaped display screen again, and the light rays which are not blocked pass through the rotary arc-shaped display screen and then pass through the diaphragm to be projected onto the spherical projection screen. The invention realizes the projection of the ultra-wide angle spherical screen by utilizing the advantage of spherical symmetry, and can realize the projection of a large angle by using one concave reflecting mirror.

Description

Optical projection system

Technical Field

The invention relates to the technical field of projection display, in particular to an optical projection system.

Background

The projection system is a system for amplifying and projecting an image on a micro display onto a curtain through an optical lens, can realize large-size display, is widely used in meeting rooms, home theatres and the like, and is gradually developed to ultra-short focus, namely, large pictures are projected through short distances. The spherical screen cinema effect can be realized through the projection mode, so that an observer has the feeling of being personally on the scene, but the projection lens of the existing mode is very complex, more than ten lenses are needed to form, and under many conditions, aspheric intervention is needed, so that the cost is high. For spherical screen projection, due to the limitation of transmission angle, a plurality of projectors are generally needed to be spliced to realize large-scale display, so that the assembly is difficult, and the images are difficult to be seamlessly fused.

Disclosure of Invention

The invention provides an optical projection system for solving the problems that the existing optical projection system is complex in projection lens, high in cost, difficult to assemble, difficult to seamlessly fuse images and the like due to the limitation of a transmission angle for spherical screen projection.

An optical projection system comprises a rotary arc-shaped display screen, a concave reflecting mirror, a diaphragm and a spherical projection screen;

the spherical projection screen, the spherical center of the concave reflector and the arc center of the rotating arc-shaped display screen are all positioned at the center of the diaphragm;

after being reflected by the concave reflecting mirror, the light rays emitted by the rotary arc-shaped display screen pass through the position of the rotary arc-shaped display screen again, and the light rays which are not blocked pass through the rotary arc-shaped display screen and then pass through the diaphragm to be projected onto the spherical projection screen.

The invention also includes another optical projection system comprising a rotating arc-shaped display screen, a concave reflector, a diaphragm, a corrective lens and a planar projection screen;

the rotary arc-shaped display screen is positioned between the diaphragm and the concave reflecting mirror, and the correcting lens is positioned at one side of the diaphragm;

light rays emitted by the rotary arc-shaped display screen are reflected by the concave reflecting mirror, pass through the position of the rotary arc-shaped display screen again, and the light rays which are not blocked pass through the rotary arc-shaped display screen, pass through the diaphragm and then are projected onto the plane projection screen through the correcting lens.

The invention has the beneficial effects that: the invention can realize the projection of the ultra-wide angle spherical screen by fully utilizing the advantage of spherical symmetry, and can realize the projection of a large angle by using only one concave reflecting mirror. Meanwhile, by adding the correction lens, the projection of the ultra-short focal plane screen can be realized, and compared with the traditional mode, the invention can greatly simplify an optical system and realize the projection of ultra-high definition.

Drawings

FIG. 1 is a projection light path diagram of an optical projection system according to the present invention;

FIG. 2 is a view of the light path of FIG. 1 taken from a portion of the projection range;

FIG. 3 is a schematic diagram of a structure of a rotated arc-shaped display screen;

FIG. 4 is a graph of the diffraction limit and imaging spots of the optical projection system of FIG. 1;

FIG. 5 is a schematic diagram of a front micro-projection system in place of a rotating arcuate display screen;

FIG. 6 is a schematic diagram of the front micro-projection system of FIG. 5;

FIG. 7 is a schematic diagram of an alternative optical projection system incorporating a corrective lens to achieve ultra-short focal projection;

FIG. 8 is a schematic diagram showing the relationship among the rotated arc display screen, the diaphragm and the corrective lens of FIG. 7;

FIG. 9 is a schematic diagram of a configuration employing a rear micro-projection system instead of a rotating arcuate display screen;

fig. 10 is a schematic diagram of the rear micro-projection system of fig. 9.

In the figure: 1. a rotary arc display screen, 1-1, red pixel strips, 1-2, green pixel strips, 1-3, blue pixel strips, 2, a concave reflector, 3, a diaphragm, 4, a spherical projection screen, 5, a corrective lens, 6, a front micro-projection system, 6-1, a rotary front scattering linear screen, 6-2, a front micro-projection image source, 6-3, a front micro-projection lens, 7, a rear micro-projection system, 7-1, a rotary rear scattering linear screen, 7-2, a rear micro-projection image source, 7-3, a rear micro-projection lens, 8 and a plane projection screen.

Detailed Description

In the first embodiment, referring to fig. 1 to 6, an optical projection system, as shown in fig. 1, mainly includes a rotating linear display screen 1, a concave mirror 2, a diaphragm 3, and a spherical projection screen 4, where the rotating linear display screen 1 is circular-arc-shaped, and a large number of light emitting pixels are arranged on the surface, and the positions of the pixels are between the diaphragm 3 and the concave mirror 2, and by rotation and human persistence effect, an image is generated, and the width of the image needs to be smaller than the size of the diaphragm, and the finer the image.

In this embodiment, the concave mirror 2 may be a spherical mirror, and the spherical projection screen 4, the spherical center of the concave mirror 2, and the circular arc center of the rotating linear display screen 1 are all located at the center of the diaphragm 3, so that the system maintains spherical symmetry as a whole, and each pixel can be projected almost equally clearly. After being reflected by the concave reflector 2, the light rays emitted by the rotating linear display screen 1 pass through the position of the rotating linear display screen 1 again, and the width of the light rays is smaller than that of the diaphragm, so that the light rays which are not blocked can pass through the arc-shaped display 1 and then pass through the diaphragm to be projected onto the spherical projection screen 4; the diameter of the diaphragm is typically <2cm, and preferably the width of the rotated line display screen 1 is less than half the diameter of the diaphragm.

By way of example, the following table sets forth the optical system parameters for this method.

Surface sequence	Radius (mm)	Thickness (mm)	Material
				1 (arc shape display screen)	-50	50.44	Air-conditioner
2 (concave reflector)	-100.48	-100.48	Mirror surface
				3 (diaphragm)	Infinity of infinity	-10000	Air
4 (sphere projection screen)	10000	-	-

As shown in fig. 2, a portion of the projected image may be selected in order to optimize the spatial placement relationship. As shown in fig. 3, the rotated linear display screen 1 may also be formed by combining red, green and blue color-combined pixels integrated together or red pixel strips 1-1, green pixel strips 1-2 and blue pixel strips 1-3 distributed on different arcs, and through rotation, color fusion is realized to realize colorization. As shown in fig. 4, which shows a spot diagram of a projection image, in which a real coil is a diffraction limit, it can be seen that this method can make each angle reach the diffraction limit, thereby realizing high definition projection.

In practical application, the concave mirror 2 and the spherical projection screen 4 are not necessarily strictly spherical due to machining errors and the like, and allow a certain degree of deformation.

The present embodiment will be described with reference to fig. 5 and 6, in which a front micro-projection system 6 may be used instead of the rotating arc-shaped display screen 1;

the front micro-projection system 6 is composed of a rotary front scattering linear screen 6-1, a front micro-projection image source 6-2 and a front micro-projection lens 6-3, wherein the front micro-projection image source 6-2 projects an image onto the rotary front scattering linear screen 6-1 through the front micro-projection lens 6-3; after the image source of the rotating front scattering linear screen 6-1 is reflected by the concave reflecting mirror 2, the light which is not blocked passes through the rotating front scattering linear screen 6-1 and then passes through the diaphragm 3 to be projected onto the spherical projection screen 4 again through the position of the rotating front scattering linear screen 6-1.

In this embodiment, the rear micro-projection system 7 may be used instead of the rotating arc-shaped display screen 1;

the rear micro-projection system 7 consists of a rotary rear scattering linear screen 7-1, a rear micro-projection image source 7-2 and a rear micro-projection lens 7-3;

the rear micro-projection image source 7-2 projects an image onto the rotating rear scattering linear screen 7-1 through the rear micro-projection lens 7-3; after the image source of the rotated back-scattering linear screen 7-1 is reflected by the concave mirror 2, the light which is not blocked passes through the back-scattering linear screen 7-1 and then passes through the diaphragm 3 to be projected onto the spherical projection screen 4 again through the position of the rotated back-scattering linear screen 7-1.

In the second embodiment, referring to fig. 7 to 10, a projection optical system is described, which mainly includes an arc-shaped display screen 1, a concave mirror 2, a diaphragm 3, a planar projection screen 8, and a corrective lens 5, where the rotating linear display screen 1 is arc-shaped or arc-shaped, and a large number of pixels are arranged on the arc-shaped display screen, and the pixels are located between the diaphragm and the concave mirror, and the width of the pixels needs to be smaller than the size of the diaphragm and finer due to the rotation and the human visual persistence effect. The concave mirror 2 may be a spherical surface or an aspherical surface close to a spherical surface. The light emitted by the rotating linear display screen 1 is reflected by the concave mirror 2 and then passes through the position of the rotating linear display screen 1 again, and the width of the light is smaller than that of the diaphragm, so that the light which is not blocked passes through the rotating linear display screen 1 and then passes through the diaphragm, and then is projected onto the plane projection screen 8 through the correction lens 5, and a plurality of correction lenses can be placed on two sides of the diaphragm 3 to achieve better image quality.

Surface sequence	Radius (mm)	Thickness (mm)	Material
				1 (arc shape display screen)	-25	30	Air-conditioner
2 (concave reflector)	-53.86	-55.09	Mirror surface
				3 (diaphragm)	Infinity of infinity	-15.86	Air-conditioner
4 (front surface of corrective lens)	16.95	-3	PMMA
				5 (correcting lens rear surface)	19.88	-500	Air-conditioner
4 (sphere projection screen)	Infinity of infinity	-	-

In this embodiment, in order to use the conventional area array Micro-display image source, such as DLP, LCOS, micro LED, etc., the front Micro projection system 6 is adopted to replace the rotating arc display screen 1; the front micro-projection system 6 is composed of a rotary front scattering linear screen 6-1, a front micro-projection image source 6-2 and a front micro-projection lens 6-3, wherein the front micro-projection image source 6-2 projects an image onto the rotary front scattering linear screen 6-1 through the front micro-projection lens 6-3; after the image source of the rotating front scattering linear screen 6-1 is reflected by the concave reflecting mirror 2, the light which is not blocked passes through the rotating front scattering linear screen 6-1 and then passes through the diaphragm 3 after passing through the position of the rotating front scattering linear screen 6-1 again, and then is projected onto the plane projection screen 8 through the correcting lens 5;

the present embodiment will be described with reference to fig. 9 and 10, using a rear micro projection system 7 instead of the rotating arc display screen 1; the rear micro-projection system 7 consists of a rotary rear scattering linear screen 7-1, a rear micro-projection image source 7-2 and a rear micro-projection lens 7-3;

the rear micro-projection image source 7-2 projects an image onto the rotating rear scattering linear screen 7-1 through the rear micro-projection lens 7-3; after the image source of the rotated back-scattering linear screen 7-1 is reflected by the concave mirror 2, the light which is not blocked passes through the rotated back-scattering linear screen 7-1 and then passes through the diaphragm 3 after passing through the position of the rotated back-scattering linear screen 7-1, and then is projected onto the plane projection screen 8 through the correction lens 5.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims

1. An optical projection system comprises a rotary arc-shaped display screen (1), a concave reflecting mirror (2), a diaphragm (3) and a spherical projection screen (4); the method is characterized in that:

the rotary arc-shaped display screen (1) is positioned between the diaphragm (3) and the concave reflecting mirror (2), the spherical projection screen (4) and the spherical center of the concave reflecting mirror (2) and the arc center of the rotary arc-shaped display screen (1) are positioned at the center of the diaphragm (3); the width of the rotary arc-shaped display screen (1) is smaller than the size of the diaphragm (3);

after being reflected by the concave reflecting mirror (2), the light rays emitted by the rotary arc-shaped display screen (1) pass through the position of the rotary arc-shaped display screen (1) again, and the light rays which are not blocked pass through the rotary arc-shaped display screen (1) and then are projected onto the spherical projection screen (4) through the diaphragm (3).

2. An optical projection system according to claim 1, wherein: the luminous pixels on the rotary arc-shaped display screen (1) are formed by combining red, green and blue combined pixels or red pixel strips (1-1) distributed on different arcs, and the green pixel strips (1-2) and the blue pixel strips (1-3) are combined, so that colors are fused through rotation, and colorization is realized.

3. An optical projection system, characterized by: comprises a rotary arc-shaped display screen (1), a concave reflecting mirror (2), a diaphragm (3), a correcting lens (5) and a plane projection screen (8);

the rotary arc-shaped display screen (1) is positioned between the diaphragm (3) and the concave reflecting mirror (2), and the correcting lens (5) is positioned at one side of the diaphragm (3); the width of the rotary arc-shaped display screen (1) is smaller than the size of the diaphragm (3);

after being reflected by the concave reflecting mirror (2), the light rays emitted by the rotary arc-shaped display screen (1) pass through the position of the rotary arc-shaped display screen (1) again, and the light rays which are not shielded pass through the rotary arc-shaped display screen (1) and then pass through the diaphragm (3) and then are projected onto the plane projection screen (8) through the correcting lens (5).

4. An optical projection system according to claim 3, wherein: the correction lenses (5) are two groups and are respectively positioned at two sides of the diaphragm (3).