CN106855655B

CN106855655B - Asymmetric curved prism image display optical system

Info

Publication number: CN106855655B
Application number: CN201510898680.8A
Authority: CN
Inventors: 叶世博; 赖韦龙; 陈纪暐; 陈心怡
Original assignee: MIN AIK Tech CO Ltd
Current assignee: MIN AIK Tech CO Ltd
Priority date: 2015-12-08
Filing date: 2015-12-08
Publication date: 2020-01-03
Anticipated expiration: 2035-12-08
Also published as: CN106855655A

Abstract

The invention discloses an image display optical system of an asymmetric curved surface prism, wherein a second prism and a third prism are respectively arranged in front of and behind a first prism, a light-emitting plane is arranged on one side of the first prism close to eyes, the first prism is just opposite to a light-in plane of the second prism by an air gap, and the plane can be used as a reference for detecting a free-form surface; the light-emitting plane of the second prism close to the eyes and the side plane of the third prism close to the outer side of the visual field are parallel to each other, so that the external image is clearer; when the imaging panel emits light into the first prism, the light is totally reflected to the reflecting cambered surface through the light-emitting plane and then passes through the light-emitting plane, passes through the air gap, enters the light-in plane and the light-emitting plane of the second prism, and then is imaged on the retina through the eye pupil.

Description

Asymmetric curved prism image display optical system

Technical Field

The invention relates to an asymmetric curved surface prism image display optical system; and more particularly, to a head-mounted asymmetric curved prism image display optical system which projects an image into an eye pupil using an optical system, thereby enabling an eye to read the image information and simultaneously view an external scene.

Background

The prior art is mainly divided into an immersion type and a non-immersion type, wherein the non-immersion type head-mounted display is the current mainstream, and can be used for displaying pictures and allowing users to see external images behind a display screen; this characteristic is often used for augmented reality, and the design of augmented reality in the market is mainly to apply more free-form surface designs in the optical system, and this technology of multiple free-form surfaces becomes one of the main technical means of this product, and the more advanced examples are: although many improvements have been made in this design, the following major disadvantages in use and manufacture are still present in U.S. patent nos. 5,701,202, 6,384,983 and 2001/0009478a 1:

firstly, because a plurality of free-form surfaces are arranged on the main optical lens at present, if the external image behind the display screen is required to be seen clearly, a compensation lens is added behind the free-form surface of the optical lens, but because the first surface of the optical lens adopts the design of the free-form surface or the curved surface, the design of the compensation lens behind the optical lens cannot completely compensate all the view fields in front, so that the definition of the external image behind the display screen is not good, and the perfect image cannot be achieved.

In addition, although the manufacturing of the free-form surface can be realized by the ultra-precision machining technology at present, the measurement verification and correction of the shot product still have great difficulties, which mainly result from the fact that the measurement cannot be performed in a good positioning mode, and the shot product is difficult to be corrected because a reference surface cannot be used as a reference for measuring the tolerance of the product part, so that the manufacturing process needs much inspection time and labor cost, and slow experiments are needed to make a better corrected lens.

Therefore, how to develop a structure with low cost for performing a positioning inspection and correction on the main optical lens can not only improve the definition of the image, but also make the correction more accurate, and save the manufacturing time and the cost of manpower and material resources, which is the direction of the effort in the industry.

Disclosure of Invention

The main objective of the present invention is to solve the above-mentioned deficiencies in the prior art, and to solve the first disadvantage in the prior art, in the optical device, the surface of the optical element close to the eye is designed as a plane, and the surface close to the external image is also designed as a plane, and the two planes are parallel, so that the external image is seen by the eye as if the external image is seen through one glass window, and the external image is not affected by the eye, so that a clear image can be obtained.

Another object of the present invention is to solve the problem of measurement and correction, so that the reflecting surface of the intermediate element of the optical system is also designed as a plane, so that when the free-form surface element is manufactured, the plane can be used as a reference surface for measurement and correction, thereby solving the second disadvantage of the prior art.

To achieve the above object, the present invention can be achieved by the following means:

arranging a first prism, wherein one end of the first prism is provided with a light inlet concave arc, one side close to eyes is provided with a light outlet plane, and the outer side of the first prism close to the visual field is provided with a reflecting cambered surface which is a free-form surface; a second prism is arranged and provided with a light inlet plane and a light outlet plane, wherein the light inlet plane is opposite to the light outlet plane of the first prism, an air gap is reserved, and the light outlet plane is opposite to eyes; a third prism is additionally arranged and is a light compensation sheet, the third prism is provided with a bearing concave arc, the concave arc and the reflection cambered surface of the free curved surface of the first prism, which is close to the outer side of the visual field, can be relatively abutted against (or bonded with) the reflection cambered surface of the first prism, a side plane is arranged close to the outer side of the visual field, and the side plane is parallel to the light emergent plane of the second prism; a display panel is arranged at the concave arc of the incident light of the first prism; the image light on the display panel passes through the light incident concave arc of the first prism to emit to the light emergent plane, is totally reflected to the reflecting cambered surface through the light emergent plane, is reflected and passes through the light emergent plane, passes through the air gap, enters the light incident plane and the light emergent plane of the second prism, and is imaged on the retina through the eye pupil.

Drawings

FIG. 1 is a main structural assembly diagram of the present invention;

FIG. 2 is an exploded view of the main structure of the present invention;

FIG. 3 is a top view of an embodiment of the present invention;

FIG. 4a is a schematic diagram illustrating the operation of the present invention;

FIG. 4b is a schematic diagram of the second embodiment of the present invention;

fig. 5 is a schematic diagram of a structural change of the present invention.

Description of reference numerals: 10-a first prism; 11-concave arc of light incidence; 12-a light exit plane; 13-a reflective arc surface; 14-a convergence end; 20-a second prism; 21-a light incident plane; 22-a light exit plane; 23-a reflective end face; 30-third prism; 31-carrying concave arc; 32-side plane; 33-end face; 34-butting end; 40-a display panel; 50-eye pupil; l1-light; an S-gap.

Detailed Description

As shown in fig. 1 and fig. 2, the present invention provides an asymmetric curved prism image display optical system, which at least comprises:

a first prism 10, wherein one end (upper end or lower end) of the first prism is provided with an incident concave arc 11, the incident concave arc 11 can be a spherical arc, an aspheric arc or a free-form surface, one side of the first prism 10 close to the eyes is provided with an emergent plane 12, one end of the emergent plane 12 is adjacent to the incident concave arc 11, the outer side of the first prism 10 close to the visual field is provided with a free-form reflective arc surface 13, one end of the reflective arc surface 13 is adjacent to the incident concave arc 11, and the other end is intersected with the emergent plane 12 to form a beam-receiving end 14 of the first prism 10; the reflective arc surface 13 is coated to improve the reflective effect.

A second prism 20, which is a wedge prism and has a light incident plane 21, a light emergent plane 22 and a reflecting end surface 23, wherein the light incident plane 21 is opposite to the light emergent plane 12 of the first prism 10, and an air gap S is left, and the purpose of the gap S is to enable light to form total reflection when the light irradiates the light emergent plane 12 in the first prism 10 at a large angle, so that the second prism 20 is not interfered; the light exit plane 22 faces the eye.

A third prism 30, which is a light compensation plate, having a bearing concave arc 31, capable of relatively abutting against the reflective arc 13 of the first prism 10, and a side plane 32 is arranged near the outer side of the visual field, the side plane 32 is parallel to the light-emitting plane 22 of the second prism 20, so as to make the eyes see the external image as if seeing the outside through a glass window, and the external image can not be influenced, so the image is clearer; in order to make the third prism 30 more completely fit with the first prism 10 and the second prism 20, an end face 33 and a contact end 34 are respectively provided to make the matching more compact and tight.

In practical implementation, the second prism 20 and the third prism 30 may be integrally formed, that is, the lower side abutting end 34 of the third prism 30 is combined with the lower optical non-acting part of the light incident plane 21 of the second prism 20, so as to be integrally formed, and the first prism 10 can be just inserted between the second prism 20 and the third prism 30, which is another embodiment of the present invention.

The bearing concave arc 31 of the third prism 30 abuts against the reflective arc 13 of the first prism 10, and the abutting manner between the two includes, but is not limited to, tight abutting, bonding, or leaving a predetermined air gap.

The positions of the first prism 10, the second prism 20, and the third prism 30 shown in fig. 1 where the ineffective light passes through at the lower end can be cut off and aligned at the lower end as shown in fig. 5, so as to save space and material, and the present invention also belongs to the scope of the present invention.

As shown in fig. 1 and 2, a display panel 40 is disposed at the concave arc 11 of the first prism 10; the display panel 40 can be a self-luminous panel or a panel reflecting light, and can emit an image into the first prism 10.

As shown in fig. 2, 3 and 4a, if the display panel 40 is a self-luminous panel, the image light L1 on the display panel 40 passes through the concave light-in arc 11 of the first prism 10 to emit to the light-out plane 12, and is totally reflected to the reflective arc 13 of the coating film by the light-out plane 12, and is reflected to pass through the light-out plane 12, and passes through the air gap S, and enters the light-in plane 21 and the light-out plane 22 of the second prism 20, and is imaged on the retina by the eye pupil 50, and the external image is imaged on the retina by entering the eye pupil 50, as shown in fig. 4b, because the optical system composed of the first prism 10, the second prism 20 and the third prism 30 in the present invention, the light-out plane 22 of the second prism 20 and the side plane 32 of the third prism 30 are set to be parallel, so that the eye sees the external image as if seeing the external image through a glass window, and does not affect the human eye seeing the external image, a clearer image can be obtained.

Due to the design, the invention has the following advantages in use and manufacture:

as shown in fig. 4b, because the optical system composed of the first prism 10, the second prism 20 and the third prism 30 in the present invention sets the light-emitting plane 22 of the second prism 20 close to the eye and the side plane 32 of the third prism 30 to be parallel, so that the eye can see the external image as if seeing the external image through one glass window, the eye cannot be influenced to see the external image, a clearer image can be obtained, and the defect of the existing curved surface is improved.

As shown in fig. 1 and 2, since the first prism 10 of the present invention designs the light-exiting plane 12 as a plane, when manufacturing a free-form surface device, the plane can be used as a reference plane for measurement and correction, so as to obtain more accurate precision, make the manufacturing process simpler and faster, make the parts have the same specification standard during manufacturing, and make the production more convenient.

The design of the invention reduces free-form surfaces, greatly reduces the manufacturing cost and time, is more suitable for mass production, can reduce the cost, and has another advantage.

The above-described structures are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; accordingly, equivalent or easy variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention, such as: the shape and size of the display panel can be changed, and other reflective films can be used, or different prism materials can be used and the type of the display panel can be changed.

Claims

1. An asymmetric curved prism image display optical system, comprising:

a first prism, one end of which is provided with a concave light-in arc, one side close to eyes is provided with a light-out plane, and the outer side of the first prism close to the visual field is provided with a reflecting cambered surface which is a free-form surface;

a second prism having a light incident plane and a light emergent plane, wherein the light incident plane is opposite to the light emergent plane of the first prism and has an air gap, and the light emergent plane is opposite to the eyes;

the third prism is a light compensating plate, is provided with a bearing concave arc, can be relatively attached to the reflecting arc surface of the first prism, and is provided with a side plane close to the outer side of the visual field, and the side plane is parallel to the light emergent plane of the second prism;

the display panel is arranged at the incident concave arc of the first prism;

the image light on the imaging panel passes through the light-in concave arc of the first prism to emit to the light-out plane of the first prism, is totally reflected to the reflection cambered surface through the light-out plane of the first prism, is reflected and passes through the light-out plane of the first prism, passes through the air gap, enters the light-in plane and the light-out plane of the second prism, and is imaged on the retina through the eye pupil.

2. The asymmetric-curved prism image-displaying optical system of claim 1 wherein the concave arc of light incidence of the first prism is a spherical arc.

3. The asymmetric-curved prism image-displaying optical system of claim 1 wherein the concave arc of light incidence of the first prism is an aspheric arc.

4. The asymmetric-curved prism image-displaying optical system of claim 1 wherein the concave arc of light incidence of the first prism is a free-form surface.

5. The asymmetric-curved prism image-displaying optical system of claim 1, wherein the first prism has a coating film on its reflective curved surface.

6. The asymmetric curved prism image display optical system as claimed in claim 1, wherein one end of the light exit plane and the reflection arc surface of the first prism are respectively adjacent to the light entrance concave arc, and the other end intersects to form a beam-receiving end of the first prism.

7. The asymmetric-curved prism image-displaying optical system of claim 1 wherein the second prism is a wedge prism formed by an incident plane, an exit plane and a reflective end face.

8. The asymmetric-curved prism image-displaying optical system of claim 1, wherein the image-displaying panel is a self-luminous panel or a non-self-luminous panel.

9. The asymmetric-curved prism image-displaying optical system of claim 1, wherein the concave bearing arc of the third prism abuts against the curved reflective surface of the first prism in a manner of tight abutment, adhesion, or a predetermined air gap.

10. The asymmetric-curved prism image-displaying optical system of claim 1, wherein the second prism and the third prism are integrally formed.