CN113805337A - Multi-refraction-reflection near-to-eye optical system - Google Patents

Multi-refraction-reflection near-to-eye optical system Download PDF

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Publication number
CN113805337A
CN113805337A CN202010477538.7A CN202010477538A CN113805337A CN 113805337 A CN113805337 A CN 113805337A CN 202010477538 A CN202010477538 A CN 202010477538A CN 113805337 A CN113805337 A CN 113805337A
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China
Prior art keywords
lens
working surface
optical system
film
optical
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CN202010477538.7A
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Chinese (zh)
Inventor
何芳
卫荣杰
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Lecol Technology Shanghai Co ltd
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Lecol Technology Shanghai Co ltd
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Priority to CN202010477538.7A priority Critical patent/CN113805337A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/002—Magnifying glasses
    • G02B25/007—Magnifying glasses comprising other optical elements than lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/002—Magnifying glasses
    • G02B25/008—Magnifying glasses comprising two or more lenses

Abstract

The invention relates to the field of augmented reality, in particular to a multi-refraction and reflection near-to-eye optical system. The method comprises the following steps: the method comprises the following steps: an image display, a reflection amplifier, a first lens; one side of the reflection amplifier facing the triangular prism-like space is provided with a first optical working surface, and one side of the first lens facing the triangular prism-like space is provided with a second optical working surface; the first optical working surface is used for directly reflecting light rays emitted by the image display; one side of the reverse triangular prism-like space of the reflection amplifier is provided with a third optical working surface; the third optical working surface is used for reflecting the light rays transmitted through the first optical working surface. The beneficial effects of the above technical scheme are: (1) the structure is compact, light and thin, and the wearing of the user is facilitated, so that the wearing comfort of the user is improved; (2) the visual field angle is increased, the immersion feeling of a user is improved, and the user can observe a high-quality dynamic image to the maximum extent.

Description

Multi-refraction-reflection near-to-eye optical system
Technical Field
The invention relates to a multi-refraction near-eye optical system, in particular to a multi-refraction near-eye optical system which can increase the view field angle while the structure is light.
Background
Augmented Reality (AR) technology is a technology for superimposing a virtual picture in a real scene to facilitate user interaction, and AR display equipment is equipment for a user to view the virtual picture and the real scene. As AR technology advances, the structural design requirements of AR display devices are also increasing.
In the structural design process, consider that AR display device belongs to head mounted device, consequently need satisfy compact structure frivolous in the structural design, the user of being convenient for wears to improve the comfort level that the user wore, still need increase the visual field angle simultaneously, promote user's the sense of immersing, let the user can observe high-quality dynamic image by at utmost. However, structural parameters such as the field of view, the entrance pupil diameter, and the short focal length in the optical system are mutually restricted, and it is difficult to satisfy the above conditions at the same time.
In the prior art, a near-eye see-through head-display optical system is provided, which includes a first lens, a second lens and an image display, wherein the first lens and the second lens are both attached to the image display, the first lens and the second lens are both attached to the miniature image display, and the first lens and the second lens are both of uniform-thickness free-form surface lenses. The near-eye perspective head display optical system eliminates the aberration of light emitted by the miniature image display in all directions, but increases the thickness and weight of the optical system and reduces the wearing comfort of a user, besides reducing the times of light refraction in the optical system framework.
It is therefore seen that there is a great need to provide an optical system that can simultaneously satisfy the augmented reality of compact and lightweight construction and an increased field of view.
Disclosure of Invention
In view of the above problems in the prior art, a multi-fold and trans-form near-to-eye optical system is provided.
The specific technical scheme is as follows:
the invention discloses a multi-refraction-reflection near-to-eye optical system, which comprises: an image display, a reflection amplifier, a first lens; one side of the first lens is attached to one side of the image display, one side of the reflection amplifier is attached to the other side of the image display, the other side of the first lens is attached to the other side of the reflection amplifier, and the first lens, the reflection amplifier and the image display are distributed to form a triangular prism-like space; it is characterized in that the preparation method is characterized in that,
one surface of the reflection amplifier facing the triangular prism-like space is provided with a first optical working surface, and one surface of the first lens facing the triangular prism-like space is provided with a second optical working surface;
the first optical working surface is used for directly reflecting light rays emitted by the image display;
a third optical working surface is arranged on one surface of the reflection amplifier, which is opposite to the triangular prism-like space; the third optical working surface is used for reflecting the light transmitted by the first optical working surface.
Preferably, the first optical working surface and the second optical working surface are both plated with optical film layers.
Preferably, the optical film layer is one of a transflective film, an angle selective film and a reflective polarizing film.
Preferably, when the plated optical film layer on the first optical working surface is a reflective polarizing film and the plated optical film layer on the second optical working surface is a semi-reflective and semi-transparent film, the surface of the semi-reflective and semi-transparent film is further plated with an 1/4 wave sheet film.
Preferably, the third optical working surface is plated with an 1/4 wave piece film and/or a semi-reflecting and semi-transparent film.
Preferably, an included angle between the optical axis direction of the 1/4 wave plate film and the transmission axis direction of the optical film layer on the second optical working surface is 45 °.
Preferably, the reflection amplifier includes a plano-convex lens, the plano-convex lens faces towards the one side of the similar triangular prism space is a plane, and the plano-convex lens is reverse to the one side of the similar triangular prism space is a convex surface.
Preferably, the first optical working surface is the plane of the plano-convex lens, and the third optical working surface is the convex surface of the plano-convex lens.
Preferably, a compensation lens is arranged outside the convex surface.
Preferably, the compensation lens is a plano-concave lens, and a concave surface of the plano-concave lens faces a convex surface of the plano-convex lens.
Preferably, the semi-reflecting and semi-transparent film is plated on the concave surface of the plano-concave lens or the convex surface of the plano-convex lens.
Preferably, the reflection amplifier comprises a fresnel lens, and one surface of the fresnel lens, which is opposite to the triangular prism-like space, is a fresnel surface.
Preferably, the reflection amplifier includes a second lens, and the first optical working surface is a surface of the second lens facing the first lens.
Preferably, the value range of the included angle α between the second lens and the horizontal visual axis direction is as follows: alpha is more than or equal to 0 and less than or equal to 15 degrees.
Preferably, the reflection amplifier further comprises a convex uniform thickness lens, the second lens is disposed between the convex uniform thickness lens and the first lens, and a convex surface of the convex uniform thickness lens is opposite to the second lens.
Preferably, the reflection amplifier further comprises a concave-flat lens, the second lens is disposed between the concave-flat lens and the first lens, and a concave surface of the concave-flat lens faces the second lens.
Preferably, the reflection amplifier further includes a concave type housing, the second lens is disposed between the concave type housing and the first lens, and a concave surface of the concave type housing faces the second lens.
Preferably, the projector further comprises a projection lens, the projection lens is disposed on a side of the image display emitting the light, and is used for shrinking the light emitted by the image display.
Preferably, the value range of the included angle β between the first lens and the horizontal visual axis direction is as follows: beta is more than or equal to 45 degrees.
Preferably, the transflective film has a reflectivity of 30% and a transmittance of 70%.
The technical scheme of the invention has the beneficial effects that: the reflection amplifier is provided with the first optical working surface and the third optical working surface, so that the structure is compact, light and thin, the wearing of a user is facilitated, and the wearing comfort of the user is improved; meanwhile, the view field angle is increased, the immersion feeling of a user is improved, and the user can observe a high-quality dynamic image to the maximum extent.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
FIG. 1 is a schematic diagram illustrating light propagation in a first embodiment of a near-eye optical system in accordance with the present invention;
FIG. 2 is a schematic diagram illustrating light propagation of a second embodiment of a near-eye optical system in accordance with the present invention;
FIG. 3 is a schematic diagram illustrating light propagation of a third embodiment of a near-eye optical system in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating light propagation of a fourth embodiment of a near-eye optical system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating light propagation of a fifth embodiment of a near-eye optical system in accordance with an embodiment of the present invention;
FIG. 6 is a schematic ray propagation diagram of a sixth embodiment of a near-eye optical system in accordance with an embodiment of the present invention;
fig. 7 is a schematic light propagation diagram of a near-eye optical system according to a seventh embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, the embodiments and features of the embodiments are described without conflict.
The first embodiment is as follows:
as shown in fig. 1, the present invention provides a multi-fold, trans-form, near-to-eye optical system comprising: the method comprises the following steps: an image display 1, a reflection amplifier 2, a first lens 3; one side of the first lens 3 is attached to one side of the image display 1, one side of the reflection amplifier 2 is attached to the other side of the image display 1, the other side of the first lens 3 is attached to the other side of the reflection amplifier 2, and the first lens 3, the reflection amplifier 2 and the image display 1 are distributed to form a triangular prism-like space; wherein the content of the first and second substances,
a first optical working surface is arranged on one surface of the reflection amplifier 2 facing the triangular prism-like space, and a second optical working surface is arranged on one surface of the first lens 3 facing the triangular prism-like space;
the first optical working surface is used for directly reflecting the light rays emitted by the image display 1;
one side of the reverse triangular prism-like space of the reflection amplifier 2 is provided with a third optical working surface; the third optical working surface is used for reflecting the light transmitted by the first optical working surface.
According to the technical scheme of the multi-fold and anti-reflection near-eye optical system, the multi-fold and anti-reflection near-eye optical system comprises: the image display device comprises an image display 1, a reflection amplifier 2 and a first lens 3, wherein one side of the reflection amplifier 2 facing to a similar triangular prism space is provided with a first optical working surface, one side of the first lens 3 facing to the similar triangular prism space is provided with a second optical working surface, and one side of the reflection amplifier 2 facing to the reverse similar triangular prism space is provided with a third optical working surface. The first optical working surface and the second optical working surface are both plated with optical film layers, and the optical film layers are one of semi-reflecting and semi-transmitting films, angle selection films and reflective polarizing films. And the third optical working surface is plated with an 1/4-wave sheet film and/or a semi-reflecting and semi-transmitting film, wherein the reflectivity of the semi-reflecting and semi-transmitting film is 30%, and the transmissivity of the semi-reflecting and semi-transmitting film is 70%.
Specifically, in a preferred embodiment, the reflection amplifier 2 includes a plano-convex lens 21, an angle α between an optical axis L2 of the plano-convex lens 21 and a horizontal visual axis L1 of the user's eye 4 is 5 °, an angle β between the first lens and a horizontal visual axis L1 is 45 ° or more, a first optical working surface provided on a side of the plano-convex lens 21 facing the triangular prism-like space is plated with a semi-reflective and semi-transmissive film 21a, a third optical working surface provided on a side of the plano-convex lens 21 facing the triangular prism-like space is plated with a 1/4 wave film 21b and a semi-reflective and semi-transmissive film 21c, and a second polarizing film working surface provided on a side of the first lens 3 facing the triangular prism-like space is plated with a reflective film 3 a.
In this embodiment, as shown in the light propagation diagram of fig. 1, the light emitted from the image display 1 reaches the first optical working surface, is directly reflected by the transflective film 21a on the first optical working surface to form a first light, and the first light is reflected to the second optical working surface, wherein the polarization direction of the first light is perpendicular to the transmission axis direction of the reflective polarizing film 3a, therefore, the first light is reflected by the reflective polarizing film 3a on the second optical working surface to form a second light, the second light is reflected to the first optical working surface, at this time, the second light is transmitted by the semi-reflective and semi-transparent film 21a on the first optical working surface to form a third light, the third light is transmitted to the third optical working surface, the third light is reflected by the 1/4 wave sheet film 21b and the semi-reflective and semi-transparent film 21c coated on the third optical working surface to form a fourth light, and the fourth light reaches the second optical working surface on the first lens 3 after passing through the first optical working surface. The polarization direction of the fourth light at this time is the same as the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, and thus can be transmitted through the first lens 3 to enter the eye 4 of the user.
Through the technical scheme, the light is reflected once by the first optical working surface in the transmission process, the polarization direction of the light is changed from vertical to the same direction as the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, the light can reach the eyes 4 of a user after transmitting the first optical working surface and the first lens 3, and the eyes of the user receive the amplified virtual image. Meanwhile, the real scene light in the real environment also transmits the reflection amplifier 2 and the first lens 3 to enter the eye 4 of the user, so that the user can see a real image. Therefore, the user can see the superposed image of the virtual image and the real image so as to achieve the effect of augmented reality.
Meanwhile, the real scene light in the real environment also transmits the reflection amplifier 2 and the first lens 3 to enter the eye 4 of the user, so that the user can see a real image. Therefore, the user can see the superposed image of the virtual image and the real image so as to achieve the effect of augmented reality.
Example two:
as shown in fig. 2, on the basis of the first embodiment, a compensation lens is arranged outside the convex surface.
In the above technical solution, as a preferred embodiment, the compensation lens is a plano-concave lens 22, one surface of the plano-concave lens 22 facing the plano-convex lens 21 is a concave surface, and the concave surface of the plano-concave lens 22 is cemented with the convex surface of the plano-convex lens 21.
Specifically, the reflection amplifier 2 here is a plano-convex lens 21, the compensation lens is a plano-concave lens 22, the curvature parameter of the concave surface of the plano-concave lens 22 is the same as the convex surface of the plano-convex lens 21, one surface of the plano-convex lens 21 facing the triangular prism-like space is provided with a first optical working surface coated with a semi-reflective and semi-transparent film 21a, and one surface of the plano-convex lens 21 facing the triangular prism-like space is provided with a third optical working surface coated with an 1/4 wave film 21b and a semi-reflective and semi-transparent film 21 c.
In this embodiment, as shown in the light propagation diagram of fig. 2, the light emitted from the image display 1 reaches the first optical working surface, is directly reflected by the transflective film 21a on the first optical working surface to form a first light, and the first light is reflected to the second optical working surface, wherein the polarization direction of the first light is perpendicular to the transmission axis direction of the reflective polarizing film 3a, therefore, the first light is reflected by the reflective polarizing film 3a on the second optical working surface to form a second light, the second light is reflected to the first optical working surface, and then is transmitted by the transflective film 21a on the first optical working surface to form a third light, the third light is transmitted to the third optical working surface, after passing through the 1/4 wave sheet film 21b coated on the third optical working surface, the fourth light is reflected by the semi-reflective and semi-transparent film 21c to form a fourth light, and the fourth light passes through the first optical working surface and reaches the second optical working surface on the first lens 3. The polarization direction of the fourth light at this time is the same as the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, and thus can be transmitted through the first lens 3 to enter the eye 4 of the user.
Through the technical scheme, the light is reflected once by the first optical working surface in the transmission process, the polarization direction of the light is changed from vertical to the same direction as the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, the light can reach the eyes 4 of a user after transmitting the first optical working surface and the first lens 3, and the eyes of the user receive the amplified virtual image. Meanwhile, the real scene light in the real environment also transmits the reflection amplifier 2 and the first lens 3 to enter the eye 4 of the user, so that the user can see a real image. Therefore, the user can see the superposed image of the virtual image and the real image so as to achieve the effect of augmented reality.
In addition, in the present embodiment, distortion generated in the light can be eliminated by providing the compensation lens, so that the state of the plain glasses having no diopter is achieved.
Example three:
in a preferred embodiment, as shown in fig. 3, the reflection amplifier 2 comprises a fresnel lens 23, and one side of the fresnel lens 23 opposite to the triangular prism-like space is a fresnel surface.
Specifically, the one side in the reverse class of triangular prism space of fresnel lens 23 is fresnel surface, from this when setting up compensation lens here, the curved surface that the compensation lens of chooseing for use corresponds also correspondingly is fresnel surface, fresnel lens 23 is equipped with first optics working face towards the one side in class triangular prism space, half-reflection semi-permeable membrane 23a has been plated, the one side in the reverse class of triangular prism space of fresnel lens 23 is equipped with third optics working face, it has 1/4 ripples membrane 23b and half-reflection semi-permeable membrane 23c to plate, first lens 3 is equipped with second optics working face towards the one side in class triangular prism space, reflective polarizing film 3a has been plated.
In this embodiment, as shown in the light propagation diagram of fig. 3, the light emitted from the image display 1 reaches the first optical working surface, is directly reflected by the transflective film 23a on the first optical working surface to form a first light, and the first light is reflected to the second optical working surface, where the polarization direction of the first light is perpendicular to the transmission axis direction of the reflective polarizing film 3a, therefore, the first light is reflected by the reflective polarizing film 3a on the second optical working surface to form a second light, the second light is reflected to the first optical working surface, at this time, the second light is transmitted by the semi-reflective and semi-transparent film 23a on the first optical working surface to form a third light, the third light reaches the third optical working surface, the third light is reflected by the 1/4 wave sheet film 23b and the semi-reflective and semi-transparent film 23c coated on the third optical working surface to form a fourth light, and the fourth light reaches the second optical working surface on the first lens 3 after passing through the first optical working surface. The polarization direction of the fourth light at this time is the same as the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, and thus can be transmitted through the first lens 3 to enter the eye 4 of the user.
Through the technical scheme, the light is reflected once by the first optical working surface in the transmission process, the polarization direction of the light is changed from vertical to the same direction as the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, the light can reach the eyes 4 of a user after transmitting the first optical working surface and the first lens 3, and the eyes of the user receive the amplified virtual image. Meanwhile, the real scene light in the real environment also transmits the reflection amplifier 2 and the first lens 3 to enter the eye 4 of the user, so that the user can see a real image. Therefore, the user can see the superposed image of the virtual image and the real image so as to achieve the effect of augmented reality.
In the present embodiment, the use of the fresnel lens enables the thickness of the reflection amplifier 2 to be reduced, making the thickness of the near-eye optical system thin.
Example four:
as shown in fig. 4, on the basis of the second embodiment, the reflection amplifier 2 includes a second lens 24, and the first optical working surface is a surface of the second lens 24 facing the triangular prism-like space.
In the above technical solution, as a preferred embodiment, the range of the included angle α between the second lens 24 and the horizontal visual axis direction is: alpha is more than or equal to 0 and less than or equal to 15 degrees.
Specifically, a parallel flat plate is selected as the second lens 24, one surface of the second lens 24 facing the triangular prism-like space is a first optical working surface, an optical film layer plated on the first optical working surface is a semi-reflective and semi-transparent film 24a, one surface of the first lens 3 facing the triangular prism-like space is a second optical working surface, the optical film layer plated on the second optical working surface is a reflective polarizing film 3a, in addition, the reflection amplifier 2 comprises a plano-convex lens 21, the compensation lens is a plano-concave lens 22, a convex surface of the plano-convex lens 21 is a third optical working surface, and the 1/4 wave piece film 21b and the semi-reflective and semi-transparent film 21c are plated.
In this embodiment, as shown in the light propagation diagram of fig. 4, the light emitted from the image display 1 reaches the first optical working surface, is directly reflected by the transflective film 24a on the first optical working surface to form a first light, and the first light is reflected to the second optical working surface, wherein the polarization direction of the first light is perpendicular to the transmission axis direction of the reflective polarizing film 3a, therefore, the first light is reflected by the reflective polarizing film 3a on the second optical working surface to form a second light, the second light is reflected to the first optical working surface, at this time, the second light is transmitted by the semi-reflective and semi-transparent film 24a on the first optical working surface to form a third light, the third light reaches the third optical working surface, the third light is reflected by the 1/4 wave sheet film 21b and the semi-reflective and semi-transparent film 21c coated on the third optical working surface to form a fourth light, and the fourth light reaches the second optical working surface of the first lens 3 after passing through the first optical working surface. The polarization direction of the fourth light at this time is the same as the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, and thus can be transmitted through the first lens 3 to enter the eye 4 of the user.
Through the technical scheme, the light is reflected once by the first optical working surface in the transmission process, the polarization direction of the light is changed from vertical to the same direction as the transmission axis direction of the reflective polarizing film 3a, the light can reach the eyes 4 of a user after transmitting the first optical working surface and the first lens 3, and the eyes of the user receive the amplified virtual image. Meanwhile, the real scene light in the real environment also transmits the reflection amplifier 2 and the first lens 3 to enter the eye 4 of the user, so that the user can see a real image. Therefore, the user can see the superposed image of the virtual image and the real image so as to achieve the effect of augmented reality.
Example five:
as shown in fig. 5, in addition to the fourth embodiment, the reflection amplifier 2 further includes a concave housing 25, the second lens 24 is disposed between the concave housing 25 and the first lens 3, and the concave surface of the concave housing faces the second lens.
Specifically, the concave surface of the concave housing 25 facing the second lens is plated with an 1/4-wave film 25b, one surface of the concave housing 25 opposite to the second lens is a third optical working surface, and is plated with a semi-reflective and semi-transparent film 25a, one surface of the second lens facing the triangular prism-like space is a first optical working surface, and is plated with a semi-reflective and semi-transparent film 24a, and one surface of the first lens 3 facing the triangular prism-like space is a second optical working surface, and is plated with a reflective polarizing film 3 a.
In the present embodiment, as shown in the light propagation diagram of fig. 5, the light emitted from the image display 1 reaches the first optical working surface, is directly reflected by the transflective film 24a to form a first light, the first light is reflected to the reflective polarizing film 3a of the second optical working surface, and the polarization direction of the second light is perpendicular to the transmission axis direction of the reflective polarizing film 3a, so that the first light is reflected by the reflective polarizing film 3a to form a third light, the third light reaches the first optical working surface, is transmitted to the concave housing 25 by the transflective film 24a, reaches the third optical working surface through the 1/4 wave plate film 25b on the concave housing 25, is reflected by the transflective film 25a on the third optical working surface to form a fourth light, the fourth light reaches the second optical working surface after passing through the first optical working surface, and the polarization direction of the light is changed to the same direction as the transmission axis direction of the reflective polarizing film 3a, thus, the fourth light ray passes through the second optical work surface and enters the eye 4 of the user.
Through the technical scheme, the eyes 4 of the user can receive the amplified virtual image. Meanwhile, the real scene light in the real environment also transmits the reflection amplifier 2 and the first lens 3 to enter the eye 4 of the user, so that the user can see a real image. Therefore, the user can see the superposed image of the virtual image and the real image so as to achieve the effect of augmented reality.
In the present embodiment, the concave housing 25 is provided to allow the external real scene light to enter the user's eye 4 almost without distortion, without adding a compensation lens.
In addition, in the above technical solution, as a preferred embodiment, the reflection amplifier 2 further includes a convex uniform thickness lens, the second lens is disposed between the convex uniform thickness lens and the first lens 3, and a convex surface of the convex uniform thickness lens is opposite to the second lens.
In addition, in the above technical solution, as another preferred embodiment, the reflection amplifier 2 further includes a concave-flat lens, the second lens is disposed between the concave-flat lens and the first lens 3, and a concave surface of the concave-flat lens faces the second lens.
Example six:
in a preferred embodiment, as shown in fig. 6, when the optical film layer plated on the first optical working surface is a reflective polarizing film and the optical film layer plated on the second optical working surface is a transflective film, the surface of the transflective film is further plated with an 1/4 wave film.
Specifically, the first to fourth embodiments are all as follows: the plated optical film layer of the first optical working surface is a semi-reflecting and semi-transmitting film, and the plated optical film layer of the second optical working surface is a reflective polarizing film. And the optical film layer is one of a semi-reflecting and semi-transmitting film, an angle selection film and a reflective polarizing film. Different embodiments are therefore selected in this example.
In this embodiment, the plated optical film layer on the first optical working surface is a reflective polarizing film 24a, the plated optical film layer on the second optical working surface is a semi-reflective and semi-transparent film 3a, and an 1/4 wave film 3b is plated on the surface of the semi-reflective and semi-transparent film 3 a.
In the present embodiment, as shown in the light propagation diagram of fig. 6, the light emitted from the image display 1 reaches the reflective polarizing film 24a of the first optical working surface, and the polarization direction of the light is perpendicular to the transmission axis direction of the reflective polarizing film 24a, so the light is directly reflected by the reflective polarizing film 24a to form a first light, the first light is reflected to the 1/4 wave film 3b and the transflective film 3a on the second optical working surface, and is reflected by the transflective film 3a to form a second light to the first optical working surface, and the polarization direction of the second light is the same as the transmission axis direction of the reflective polarizing film 24a on the first optical working surface, so the second light is transmitted by the reflective polarizing film 24a to form a third light, and is transmitted to the third optical working surface, and is reflected by the transflective film 21c on the third optical working surface to form a first round-trip light, the first round-trip light is reflected to the first optical working surface, because the polarization direction of the first round-trip light at this time is perpendicular to the transmission axis direction of the reflective polarizing film 24a on the first optical working surface, the first round-trip light cannot penetrate through the second lens 24, and is reflected again by the first optical working surface to form the second round-trip light, the second round-trip light is reflected to the 1/4 wave sheet film 21b and the half-reflecting and half-transmitting film 21c on the third optical working surface, is reflected by the half-reflecting and half-transmitting film 21c to form the fourth light, and is reflected again to the first optical working surface, and the polarization direction of the fourth light at this time is the same as the transmission axis direction of the reflective polarizing film 24a on the first optical working surface, and therefore can be transmitted through the first lens 3 and enter the eye 4 of the user.
Through the technical scheme, the light is reflected twice by the first optical working surface in the transmission process, the polarization direction of the light is changed from vertical to the same direction as the transmission axis direction of the reflective polarizing film 24a, the light can reach the eyes 4 of the user after transmitting the first optical working surface and the first lens 3, and the eyes of the user receive the amplified virtual image. Meanwhile, the real scene light in the real environment also transmits the reflection amplifier 2 and the first lens 3 to enter the eye 4 of the user, so that the user can see a real image. Therefore, the user can see the superposed image of the virtual image and the real image so as to achieve the effect of augmented reality.
Compared with the fourth embodiment, the light in the present embodiment adds one reflection in the reflection amplifier 2, and the light path can be further folded.
Example seven:
as shown in fig. 7, in a preferred embodiment, the method further comprises: and the projection lens 11 is arranged on one side of the image display 1, which emits the light, and is used for shrinking the light emitted by the image display 1.
Specifically, a parallel plate is selected as the second lens 24, the first optical working surface is plated with a semi-reflective and semi-transparent film 24a, the second optical working surface is plated with a reflective polarizing film 3a, and the third optical working surface is plated with an 1/4 wave film 21b and a semi-reflective and semi-transparent film 21 c.
In this embodiment, as shown in the light propagation diagram of fig. 7, the light emitted from the image display 1 is contracted by the projection lens 11 and reaches the first optical working surface, and is directly reflected by the transflective film 24a on the first optical working surface to form a first light, the first light is reflected to the second optical working surface, and the polarization direction of the first light at this time is perpendicular to the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, so that the first light is reflected by the reflective polarizing film 3a on the second optical working surface to form a second light, the second light is transmitted to the third optical working surface, and is reflected by the 1/4 wave film 21b and the transflective film 21c on the third optical working surface to form a fourth light, and the fourth light reaches the second optical working surface of the first lens 3 after passing through the first optical working surface. The polarization direction of the fourth light at this time is the same as the transmission axis direction of the reflective polarizing film 3a on the second optical working surface, and thus can be transmitted through the first lens 3 to enter the eye 4 of the user.
Through the technical scheme, the light is reflected once by the first optical working surface in the transmission process, the polarization direction of the light is changed from vertical to the same direction as the transmission axis direction of the reflective polarizing film 3a, the light can reach the eyes 4 of a user after transmitting the first optical working surface and the first lens 3, and the eyes of the user receive the amplified virtual image. Meanwhile, the real scene light in the real environment also transmits the reflection amplifier 2 and the first lens 3 to enter the eye 4 of the user, so that the user can see a real image. Therefore, the user can see the superposed image of the virtual image and the real image so as to achieve the effect of augmented reality.
In the present embodiment, the projection lens 11 is provided to contract light, correct aberrations, increase the magnification of the near-eye optical system, and improve imaging resolution.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims (20)

1. A multi-fold, trans-ocular optical system comprising: an image display, a reflection amplifier, a first lens; one side of the first lens is attached to one side of the image display, one side of the reflection amplifier is attached to the other side of the image display, the other side of the first lens is attached to the other side of the reflection amplifier, and the first lens, the reflection amplifier and the image display are distributed to form a triangular prism-like space; it is characterized in that the preparation method is characterized in that,
one surface of the reflection amplifier facing the triangular prism-like space is provided with a first optical working surface, and one surface of the first lens facing the triangular prism-like space is provided with a second optical working surface;
the first optical working surface is used for directly reflecting light rays emitted by the image display;
a third optical working surface is arranged on one surface of the reflection amplifier, which is opposite to the triangular prism-like space; the third optical working surface is used for reflecting the light transmitted by the first optical working surface.
2. The near-eye optical system of claim 1 wherein the first and second optical working surfaces are each coated with an optical film layer.
3. The near-eye optical system of claim 2, wherein the optical film layer is one of a transflective film, an angle-selective film, and a reflective polarizing film.
4. The near-eye optical system of claim 3, wherein when the optical film coated on the first optical working surface is a reflective polarizing film and the optical film coated on the second optical working surface is a semi-reflective and semi-transparent film, the surface of the semi-reflective and semi-transparent film is further coated with an 1/4 wave plate film.
5. The near-to-eye optical system of claim 2 wherein the third optical working surface is coated with an 1/4 wave plate film and/or a transflective film.
6. The near-eye optical system of claim 5 wherein the angle between the direction of the optical axis of the 1/4 waveplate film and the direction of the transmission axis of the optical film layer on the second optical working surface is 45 °.
7. The near-eye optical system of claim 5 wherein the reflection amplifier comprises a plano-convex lens, a face of the plano-convex lens facing the triangular-cylinder-like space being planar, and a face of the plano-convex lens opposite the triangular-cylinder-like space being convex.
8. The near-eye optical system of claim 7 wherein the first optical working surface is the flat surface of the plano-convex lens and the third optical working surface is the convex surface of the plano-convex lens.
9. The near-eye optical system of claim 7, wherein a compensation lens is disposed outside the convex surface.
10. The near-eye optical system of claim 9 wherein the compensation lens is a plano-concave lens with its concave surface facing the convex surface of the plano-convex lens.
11. The near-eye optical system of claim 10, wherein the semi-reflective and semi-transparent film is plated on the concave surface of the plano-concave lens or the convex surface of the plano-convex lens.
12. The near-eye optical system of claim 5 wherein the reflection amplifier comprises a Fresnel lens, the side of the Fresnel lens opposite the triangular cylinder-like space being a Fresnel surface.
13. The near-eye optical system of claim 5 wherein the reflection magnifier comprises a second lens, and the first optical working surface is a surface of the second lens facing the triangular prism-like space.
14. The near-eye optical system of claim 13, wherein the angle α between the second lens and the horizontal visual axis is in the range of: alpha is more than or equal to 0 and less than or equal to 15 degrees.
15. The near-eye optical system of claim 13 wherein the reflection magnifier further comprises a convex uniform thickness lens, the second lens disposed between the convex uniform thickness lens and the first lens, the convex surface of the convex uniform thickness lens opposing the second lens.
16. The near-eye optical system of claim 13, wherein the reflection magnifier further comprises a concave-flat lens, the second lens disposed between the concave-flat lens and the first lens, the concave surface of the concave-flat lens facing the second lens.
17. The near-eye optical system of claim 13, wherein the reflection amplifier further comprises a concave-shaped housing, the second lens is disposed between the concave-shaped housing and the first lens, and the concave surface of the concave-shaped housing faces the second lens.
18. The near-eye optical system of claim 1, further comprising a projection lens disposed on a side of the image display that emits light for converging the light emitted by the image display.
19. The near-eye optical system of claim 1, wherein an angle β between the first lens and a horizontal visual axis is in a range of: beta is more than or equal to 45 degrees.
20. The near-eye optical system of claim 3 or 5 wherein the transflective film has a reflectivity of 30% and a transmittance of 70%.
CN202010477538.7A 2020-05-29 2020-05-29 Multi-refraction-reflection near-to-eye optical system Pending CN113805337A (en)

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CN202010477538.7A CN113805337A (en) 2020-05-29 2020-05-29 Multi-refraction-reflection near-to-eye optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010477538.7A CN113805337A (en) 2020-05-29 2020-05-29 Multi-refraction-reflection near-to-eye optical system

Publications (1)

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CN113805337A true CN113805337A (en) 2021-12-17

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Application Number Title Priority Date Filing Date
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