Single-ray machine image combination device

Abstract

The utility model discloses a single optical machine image combination device, which comprises an optical machine and a waveguide plate, the optical machine comprises an image source, a beam splitter prism, a first 1 / 4 wave plate, a first reflector, a second 1 / 4 wave plate and a second reflector, and light emitted by the image source is respectively reflected by the beam splitter prism to form first light and transmitted by the beam splitter prism to form second light. The first light is reflected by the first reflector after penetrating through the first 1 / 4 wave plate and then sequentially penetrates through the first 1 / 4 wave plate and the beam splitter prism to form a first combined image light which is coupled into the waveguide plate, and the second light is reflected by the second reflector after penetrating through the second 1 / 4 wave plate and then reflected by the beam splitter prism to form a second combined image light which is coupled into the waveguide plate; the first combined image light and the second combined image light are transmitted in the waveguide sheet and are received by human eyes. According to the device, the image combination distance of the single-ray machine can be adjusted, a good imaging effect is obtained, and cost reduction and miniaturization are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of augmented reality technology, and particularly relates to a single light machine image combination device. BACKGROUND

[0002] Optical waveguide technology is recognized as the ultimate near-eye optical solution for the AR industry. It can project a large field of view on an extremely thin lens, with the advantages of lightness, high light transmittance, and less visual obstruction. These advantages make the optical waveguide AR device more convenient to move and wear for a long time.

[0003] Current AR devices usually use a double light machine plus waveguide sheet scheme to meet the propagation light path. The light machine structure size is large, which leads to a large volume and high cost of the AR device. In modern AR devices, cost is an important manifestation of product power. Therefore, the single light machine plus waveguide sheet scheme is gradually replacing the double light machine plus waveguide sheet scheme in current AR products. The single light machine scheme saves the cost of one light machine compared to the double light machine scheme, and the assembly is simpler. However, the image combination distance of the single light machine scheme can only be at infinity, and cannot be adjusted according to needs. Therefore, a single light machine image combination device is proposed. SUMMARY

[0004] The purpose of the utility model is to solve the above problems. The single light machine image combination device can adjust the image combination distance of the single light machine, obtain good imaging effect, and is beneficial to cost reduction and miniaturization.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] The single light machine image combination device proposed by the utility model comprises a light machine and a waveguide sheet. The light machine comprises an image source, a light splitting prism, a first 1 / 4 wave plate, a first mirror, a second 1 / 4 wave plate, and a second mirror. Wherein:

[0007] The waveguide sheet, the image source, the first 1 / 4 wave plate, and the second 1 / 4 wave plate are respectively located on the four sides of the light splitting prism, and the image source and the second 1 / 4 wave plate are oppositely arranged, and the first 1 / 4 wave plate and the waveguide sheet are oppositely arranged;

[0008] The first mirror is obliquely arranged on the side of the first 1 / 4 wave plate away from the waveguide sheet, and the second mirror is obliquely arranged on the side of the second 1 / 4 wave plate away from the image source;

[0009] The light rays emitted by the image source are reflected by the light splitting prism to form first light rays and transmitted to form second light rays, the first light rays pass through the first 1 / 4 wave plate, are reflected by the first reflector, pass through the first 1 / 4 wave plate and the light splitting prism in sequence to form first combined image light rays and are coupled into the waveguide sheet, the second light rays pass through the second 1 / 4 wave plate, are reflected by the second reflector, pass through the second 1 / 4 wave plate again and are reflected by the light splitting prism to form second combined image light rays and are coupled into the waveguide sheet, and the first combined image light rays and the second combined image light rays propagate in the waveguide sheet and are received by the human eye.

[0010] Preferably, the included angle between the first reflector or the second reflector and the corresponding side wall of the light splitting prism is wherein:

[0011]

[0012] In the formula, H is the combined image distance, D is the interpupillary distance of the human eye, is the included angle between the virtual image optical axis and the vertical direction of the waveguide sheet, that is, the included angle between the first combined image light rays or the second combined image light rays and the vertical direction of the waveguide sheet.

[0013] Preferably, the first 1 / 4 wave plate is attached to the first reflector or the light splitting prism, and the second 1 / 4 wave plate is attached to the second reflector or the light splitting prism.

[0014] Preferably, the optical machine further comprises an imaging lens, and the first combined image light rays and the second combined image light rays pass through the imaging lens to enter the waveguide sheet.

[0015] Preferably, the optical axis of the imaging lens is coplanar with the symmetry plane of the waveguide sheet, and the first combined image light rays and the second combined image light rays are coupled into the left eye area and the right eye area of the waveguide sheet, respectively.

[0016] Preferably, the light splitting prism is a polarization light splitting prism.

[0017] Preferably, the image source is a self-luminous micro display image chip.

[0018] Compared with the prior art, the optical machine has the following beneficial effects:

[0019] The present application is based on the scheme of a single optical machine plus a waveguide, introduces a light splitting prism, a 1 / 4 wave plate and a reflector in the optical machine to divide the light emitted by the image source into two beams of light with perpendicular polarization states, adjusts the angles of the two beams of light entering the waveguide sheet by adjusting the respective reflectors, in this process, two angled polarization light projection light paths can be formed in advance by cooperating with an imaging lens, two angled virtual images are formed by cooperating with the waveguide sheet through the two angled polarization light projection light paths, and in actual use, the combined image angle can be controlled by adjusting the angle of the reflector, so that the purpose of adjusting the combined image distance is achieved, the imaging light paths can be basically consistent, and good imaging effect can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of a single light machine combined image device of the utility model.

[0021] Figure 2 It is a combined image principle view of the single light machine combined image device of the utility model.

[0022] Mark explanation: 1, image source; 2, light splitting prism; 3, first 1 / 4 wave plate; 4, first mirror; 5, second 1 / 4 wave plate; 6, second mirror; 7, imaging lens; 8, wave guide sheet; 10, light machine. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application.

[0025] The present application introduces the problem of unable to adjust the combined image distance based on the single light machine scheme, uses the polarization light splitting prism (PBS) to divide the light emitted by the image source into two beams, and then each is reflected and imaged through the imaging lens. The two beams have two polarization states, and the combined image distance can be adjusted by adjusting the reflection angle. Two virtual images are seen by the two eyes of a person, and if the two virtual images can be fused together, the vertical distance from the fusion point to the human eye is the combined image distance.

[0026] As shown in Figures 1-2 A single light machine combined image device, comprising a light machine 10 and a wave guide sheet 8, the light machine 10 comprising an image source 1, a light splitting prism 2, a first 1 / 4 wave plate 3, a first mirror 4, a second 1 / 4 wave plate 5 and a second mirror 6, wherein:

[0027] The wave guide sheet 8, the image source 1, the first 1 / 4 wave plate 3 and the second 1 / 4 wave plate 5 are respectively located on the four sides of the light splitting prism 2, and the image source 1 and the second 1 / 4 wave plate 5 are oppositely arranged, and the first 1 / 4 wave plate 3 and the wave guide sheet 8 are oppositely arranged;

[0028] The first mirror 4 is obliquely arranged on the side of the first 1 / 4 wave plate 3 away from the wave guide sheet 8, and the second mirror 6 is obliquely arranged on the side of the second 1 / 4 wave plate 5 away from the image source 1;

[0029] The light rays emitted by the image source 1 are reflected by the light splitting prism 2 to form first light rays and transmitted to form second light rays, the first light rays pass through the first 1 / 4 wave plate 3, are reflected by the first mirror 4, and then pass through the first 1 / 4 wave plate 3 and the light splitting prism 2 in turn to form first combined image light rays and are coupled into the waveguide sheet 8, the second light rays pass through the second 1 / 4 wave plate 5, are reflected by the second mirror 6, pass through the second 1 / 4 wave plate 5 again, and are reflected by the light splitting prism 2 to form second combined image light rays and are coupled into the waveguide sheet 8, the first combined image light rays and the second combined image light rays propagate in the waveguide sheet 8 and are received by the human eye.

[0030] In the light propagation path, the light rays emitted by the image source 1 pass through the light splitting prism 2 to form two beams of light, and the polarization states of the two beams of light are perpendicular to each other. One of the two beams of light is reflected, passes through the first 1 / 4 wave plate 3, is reflected by the first mirror 4, passes through the first 1 / 4 wave plate 3 again, and directly passes through the light splitting prism 2 to form first combined image light rays. Since the polarization state is changed twice by passing through the first 1 / 4 wave plate 3, the first combined image light rays can be reflected by the light splitting prism 2 once and directly pass through the light splitting prism 2 the second time. Similarly, the other beam of light directly passes through the light splitting prism 2, passes through the second 1 / 4 wave plate 5, is reflected by the second mirror 6, passes through the second 1 / 4 wave plate 5 again, and is reflected by the light splitting prism 2 to form second combined image light rays. Then, the two beams of light with different polarization states reach the waveguide sheet 8 and are finally seen by the human eye. Since the left-eye virtual image and the right-eye virtual image seen by the human eye have a certain angle, the combined image distance can be controlled by adjusting the inclination angle of the corresponding mirror.

[0031] In an embodiment, the included angle between the first mirror 4 or the second mirror 6 and the corresponding side wall of the light splitting prism 2 is 45°. In the formula, H is the combined image distance, D is the pupil distance of the human eye,

[0032]

[0033] In the formula, H is the combined image distance, D is the pupil distance of the human eye, is the included angle between the virtual image optical axis and the vertical direction of the waveguide sheet 8, that is, the included angle between the first combined image light rays or the second combined image light rays and the vertical direction of the waveguide sheet 8.

[0034] The angle at which the two beams of combined image light rays enter the waveguide sheet 8 and the angle at which the two beams of combined image light rays enter the human eye can be changed by adjusting the angle of the mirror, and finally the purpose of adjusting the combined image distance is achieved. The adjustment angle of the mirror is in a 2:1 relationship with the angle at which the combined image light rays enter the vertical direction of the waveguide sheet 8. Specifically, for example, according to the conventional pupil distance of the human eye of 63.5 mm, the combined image distance is taken as 5000 mm, The angle is 0.364°; that is, when the angles of the left and right virtual image optical axes are both 0.364° (corresponding to the tilt angle of the mirror being 0.182°), a person with a pupil distance of 63.5 mm can form an image at 5000 mm, which can be adjusted according to actual needs. The angle between the virtual image optical axis and the first or second combined image light ray in the vertical direction of the waveguide sheet 8 is in a mirror image relationship, that is, the angle between the first or second combined image light ray and the vertical direction of the waveguide sheet 8 is also As shown in Figure 2 , L1 is the first combined image light ray, L2 is the second combined image light ray, eye-L represents the left eye, and eye-R represents the right eye.

[0035] In an embodiment, the first 1 / 4 wave plate 3 is attached to the first mirror 4 or the light splitting prism 2, and the second 1 / 4 wave plate 5 is attached to the second mirror 6 or the light splitting prism 2. In this embodiment, both are attached to the corresponding side wall of the light splitting prism 2.

[0036] In an embodiment, the optical engine 10 further includes an imaging lens 7, and the first and second combined image light rays pass through the imaging lens 7 to enter the waveguide sheet 8. The imaging lens 7 can be any structure of the prior art and can be selected according to actual needs. The imaging lens can improve the imaging quality.

[0037] In an embodiment, the optical axis of the imaging lens 7 is coplanar with the symmetry plane of the waveguide sheet 8, and the first and second combined image light rays are coupled into the left eye region and the right eye region of the waveguide sheet 8, respectively. That is, by default, the angles of the left and right virtual image optical axes are equal, and the optical engine 10 is centrally arranged relative to the waveguide sheet 8, which can realize imaging by a single optical engine, which is conducive to cost reduction and miniaturization.

[0038] In an embodiment, the light splitting prism 2 is a polarization light splitting prism. The polarization light splitting prism (PBS) and the 1 / 4 wave plate (QWP) are both well-known technologies in the art, and will not be described here.

[0039] In an embodiment, the image source 1 is a self-luminous micro display image chip. The image source 1 is a micro oled display or a micro led display. It is easy to understand that the image source 1 can also use a non-self-luminous micro display image chip, in which case a light source can be matched to form a combined image light ray.

[0040] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as within the scope of the present disclosure.

[0041] The above described embodiments only express the more specific and detailed embodiments of the present application, but are not construed as limiting the scope of the application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A single-optics image-combining device, characterized by: The single-optical-mechanism combined image device comprises an optical mechanism (10) and a waveguide sheet (8), the optical mechanism (10) comprises an image source (1), a light-splitting prism (2), a first 1 / 4 wave sheet (3), a first mirror (4), a second 1 / 4 wave sheet (5) and a second mirror (6), wherein: The waveguide sheet (8), the image source (1), the first 1 / 4 wave sheet (3) and the second 1 / 4 wave sheet (5) are respectively located at four sides of the light-splitting prism (2), and the image source (1) and the second 1 / 4 wave sheet (5) are oppositely arranged, and the first 1 / 4 wave sheet (3) and the waveguide sheet (8) are oppositely arranged. The first mirror (4) is obliquely arranged on a side of the first 1 / 4 wave sheet (3) away from the waveguide sheet (8), and the second mirror (6) is obliquely arranged on a side of the second 1 / 4 wave sheet (5) away from the image source (1). The light emitted by the image source (1) is reflected by the light-splitting prism (2) to form a first light and transmitted to form a second light, the first light is reflected by the first mirror (4) after passing through the first 1 / 4 wave sheet (3), and then sequentially passes through the first 1 / 4 wave sheet (3) and the light-splitting prism (2) to form a first combined image light and is coupled into the waveguide sheet (8), the second light is reflected by the second mirror (6) after passing through the second 1 / 4 wave sheet (5), and then passes through the second 1 / 4 wave sheet (5) again and is reflected by the light-splitting prism (2) to form a second combined image light and is coupled into the waveguide sheet (8), the first combined image light and the second combined image light propagate in the waveguide sheet (8) and are received by a human eye.

2. The single-optical hybrid image device of claim 1, wherein: The included angle between the first mirror (4) or the second mirror (6) and the corresponding side wall of the light-splitting prism (2) is α / 2, wherein: In the formula, H is a combined image distance, D is a pupil distance of the human eye, and α is an included angle between a virtual image optical axis and a vertical direction of the waveguide sheet (8), that is, an included angle between the first combined image light or the second combined image light and the vertical direction of the waveguide sheet (8).

3. The single-optical hybrid image device of claim 1, wherein: The first 1 / 4 wave sheet (3) is attached to the first mirror (4) or the light-splitting prism (2), and the second 1 / 4 wave sheet (5) is attached to the second mirror (6) or the light-splitting prism (2).

4. The single-optical hybrid image device of claim 1, wherein: The optical mechanism (10) further comprises an imaging lens (7), and the first combined image light and the second combined image light pass through the imaging lens (7) to enter the waveguide sheet (8).

5. The single-optical hybrid image device of claim 4, wherein: An optical axis of the imaging lens (7) is coplanar with a symmetry plane of the waveguide sheet (8), and the first combined image light and the second combined image light are coupled into a left eye area and a right eye area of the waveguide sheet (8) respectively.

6. The single-optical hybrid image device of claim 1, wherein: The light-splitting prism (2) is a polarization light-splitting prism.

7. The single-optical hybrid image device of claim 1, wherein: The image source (1) is a self-luminous micro-display image chip.

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