CN114967135B - Ultra-short throw eyepiece system - Google Patents
Ultra-short throw eyepiece system Download PDFInfo
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- CN114967135B CN114967135B CN202110212354.2A CN202110212354A CN114967135B CN 114967135 B CN114967135 B CN 114967135B CN 202110212354 A CN202110212354 A CN 202110212354A CN 114967135 B CN114967135 B CN 114967135B
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
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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
- G02B27/0075—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. increasing, the depth of field or depth of focus
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Abstract
一种超短距目镜系统，其包括一显示屏、一光学模块及多个透镜，光学模块包含在显示屏前依序设置的反射式偏振片、第一相位延迟片、部分穿透部分反射元件、第二相位延迟片及线偏振片，多个透镜包括第一透镜、第二透镜及第三透镜，并分别设置在光学模块中至少一者的任一侧。本发明利用对于光线进行多次的相位延迟和反射，实现超短距的光学架构，同时，通过在此架构上搭配三透镜进行焦距调节，可在大视场达到良好的像差性能与影像质量。
An ultra-short-distance eyepiece system includes a display screen, an optical module and a plurality of lenses, wherein the optical module includes a reflective polarizer, a first phase delay plate, a partially transparent and partially reflective element, a second phase delay plate and a linear polarizer arranged in sequence in front of the display screen, and the plurality of lenses include a first lens, a second lens and a third lens, and are respectively arranged on any side of at least one of the optical modules. The present invention utilizes multiple phase delays and reflections of light to achieve an ultra-short-distance optical architecture, and at the same time, by using this architecture with three lenses for focal length adjustment, good aberration performance and image quality can be achieved in a large field of view.
Description
Technical Field
The present invention relates to the field of optical technology, and more particularly, to an ultra-short distance eyepiece system applicable to a head-mounted display.
Background
A Head-mounted display (Head-mounted display) is a device for displaying images and colors, usually in the form of an eye mask or helmet, and the display screen is attached to the eyes of a user, and the focal length is adjusted through an optical path to project a picture to the eyes in a short distance, so that the effect of virtual reality is generated, and the feeling of presence of a wearer is increased.
Fig. 1 is a schematic diagram of an eyepiece system of a head-mounted display in virtual reality, in which an image is projected from a display screen 10, and then enters a lens 40 after passing through an optical path with an optical path d, and the lens 40 is a single lens or a combination of multiple lenses for guiding the image into a human eye 24 of a user. Assuming an optical path d of 40mm, the length of the head-mounted display is the optical path d plus the thickness of the lens, eye fit, outer shell, etc., the sum of which is somewhat cumbersome for eye shields and helmets worn on the head and places a burden on the bridge of the nose, top of the head, neck of the user, and cannot be worn for a long time. Accordingly, current technicians are working to shorten the length of the eyepiece system in the head-mounted display to reduce the thickness of the head-mounted display for the user to wear.
In addition, in order for the virtual image provided by the head-mounted display to reproduce the visual effect, the eyepiece system must also provide a high-specification image quality to meet the visual needs of consumers for experiencing virtual reality.
Disclosure of Invention
The present invention is directed to an ultra-short distance eyepiece lens system, which adopts a three-lens design on an optical structure to achieve good aberration balance, improve image quality, and maintain ultra-short distance and large viewing angle of the eyepiece lens system. The eyepiece system can be applied to a wide-angle lens or a wide-angle eyepiece arranged on products such as a head-mounted display, a game machine and the like, and provides a more perfect visual experience for users.
Another object of the present invention is to provide an ultra-short eyepiece system, which sequentially includes a reflective polarizer, a first retarder, a partially transmissive partially reflective element, a second retarder, and a linear polarizer, and the like, after a display screen and before the human eyes, and uses multiple phase retardation and reflection of light to shorten the overall length of the eyepiece system, so as to miniaturize the head-mounted display.
In order to achieve the above objective, the present invention provides an ultra-short distance eyepiece system, which comprises a display screen, an optical module and a plurality of lenses. The display screen is used for outputting images and emitting light rays. The optical module comprises a reflective polarizer, a first phase retarder, a partial penetrating partial reflecting element, a second phase retarder, a linear polarizer and a linear polarizer, wherein the reflective polarizer is arranged corresponding to a display screen and is used for enabling vertical polarized light to penetrate and horizontal polarized light to be reflected in light, the first phase retarder is arranged corresponding to the reflective polarizer and is used for receiving light penetrating through the reflective polarizer and performing first phase retardation, the partial penetrating partial reflecting element is arranged corresponding to the first phase retarder and is used for enabling light which is delayed by the first phase to penetrate the partial penetrating partial reflecting element, the partial penetrating partial reflecting element is used for performing second phase retardation and third phase retardation, the partial penetrating partial reflecting element is arranged corresponding to the partial penetrating partial reflecting element and is used for receiving the light which is partially penetrated by the partial penetrating partial reflecting element and is delayed by the second phase retardation and the third phase retardation and is used for enabling the light which is delayed by the second phase to pass through and the light which is delayed by the fourth phase to pass through the linear polarizer. The plurality of lenses comprise a first lens, a second lens and a third lens which are respectively arranged on any side of at least one of the optical modules, the image output by the display screen is guided into at least one human eye, the third lens is the lens closest to the display screen, the first lens is the lens closest to the human eye, and meanwhile, the ultra-short distance eyepiece system must meet the following conditions (1) and (2):
(1) And
(2)
Wherein f 1 is the effective focal length of the first lens;
f 2 is the effective focal length of the second lens;
f 3 is the effective focal length of the third lens;
F is the effective focal length of the ultra-short distance eyepiece system;
r1 is the curvature radius of one side of the first lens close to the human eye;
R2 is the curvature radius of one side of the first lens close to the display screen;
r3 is the curvature radius of one side of the second lens close to the human eye;
R4 is the curvature radius of one side of the second lens close to the display screen;
r5 is the radius of curvature of the side of the third lens adjacent to the human eye, and
R6 is the radius of curvature of the side of the third lens adjacent to the display screen.
According to an embodiment of the present invention, the aforementioned lens includes a single-piece lens or a multi-piece lens. The lens comprises a single lens, a multi-piece lens and a lens, wherein the single lens is a spherical lens, an aspherical lens or a Fresnel lens, and the multi-piece lens is composed of at least one of the spherical lens, the aspherical lens and the Fresnel lens.
According to the embodiment of the invention, the ultra-short distance eyepiece system further satisfies any one of the following conditions (3) to (6):
(3)
(4)
(5) And
(6)
Wherein f s4 is the focal length of the reflecting surface of the partially penetrating partially reflecting element;
f s5 is the focal length of the reflective surface of the reflective polarizer;
TTL is the total length of the ultra-short distance eyepiece system, and
Ω is the half field view angle of the ultra short distance eyepiece system.
According to an embodiment of the present invention, at least one of the reflective polarizer, the first phase retarder, the partially reflective partially transmissive element, the second phase retarder and the linear polarizer is a thin film material or an optical coating, and is disposed on at least one of the aforementioned lenses or at least one plate glass by coating, coating or adhesion.
According to the embodiment of the invention, after the first polarized light reflected by the partially penetrating and partially reflecting element passes through the second phase delay of the first phase delay plate, the first polarized light reaches the reflecting type polarizer through the first phase delay plate, and is reflected on the reflecting type polarizer, and then the first polarized light is reflected back to the first phase delay plate to perform the third phase delay, so as to form the second polarized light, and the second polarized light passes through the first phase delay plate and the partially penetrating and partially reflecting element to reach the second phase delay plate.
According to the embodiment of the invention, the first, second, third and fourth phase delays are increased by an odd number times of 1/4 wavelength, so that the light reaching the human eye is delayed by an integral number times of 1 wavelength.
According to the embodiment of the invention, the light sent out by the display screen and entering the reflective polarizing plate is linearly polarized light, and further, the linearly polarized light is converted into left circularly polarized light or right circularly polarized light after passing through the first phase delay plate.
According to the embodiment of the invention, the light sent out by the display screen and entering the reflective polarizer is circularly polarized light, and a third phase retarder or a circular polarizer is further arranged between the display screen and the reflective polarizer, so that the circularly polarized light is converted into linearly polarized light after passing through the third phase retarder or the circular polarizer.
According to the embodiment of the invention, the light sent out by the display screen and entering the reflective polarizer is unpolarized light, and another linear polarizer is further arranged between the display screen and the reflective polarizer, so that the unpolarized light is converted into linearly polarized light after passing through the other linear polarizer.
The objects, technical contents, features and effects achieved by the present invention will be more easily understood by the following detailed description of the embodiments.
Drawings
Fig. 1 is a schematic diagram of an optical path between a display screen and a human eye of a head-mounted display in the prior art.
Fig. 2 is a schematic diagram of an embodiment of the ultra-short distance eyepiece system of the present invention.
Fig. 3A to 3C are flowcharts of steps of the ultra-short distance eyepiece system of the present invention.
Fig. 4A to 4E are schematic views showing different configurations of three lenses in the ultra-short distance eyepiece lens system of the present invention.
Reference numerals illustrate 10-display screen, 12-reflective polarizer, 14-first phase retarder, 16-partially transmissive partially reflective element, 18-second phase retarder, 20-linear polarizer, 22-lens, 24-human eye, 26-plate glass, 30-first lens, 32-second lens, 34-third lens, 40-lens, d-optical path.
Detailed Description
The invention provides an ultra-short distance eyepiece system which is applied to a head-mounted display, and utilizes a plurality of optical elements to reflect light for multiple times, and a plurality of lenses are matched in the optical elements, so that the aberration balance can be effectively achieved, the quality of an image is improved, the whole eyepiece system is shortened under the same optical path length, and the head-mounted display is miniaturized.
Please refer to fig. 2, which is a schematic diagram of an embodiment of the ultra-short distance eyepiece system of the present invention. The ultra-short eyepiece system of this embodiment includes, in order, a reflective polarizer 12, a first phase retarder 14, a partially transmissive partially reflective element 16, a second phase retarder 18, a linear polarizer 20, and three lenses 22 between a display screen 10 and at least a human eye 24. The display screen 10 outputs an image and emits light, which is polarized light or unpolarized light, and when the light is polarized light, the polarized light may be linearly polarized light, circularly polarized light or other polarized states, and in this embodiment, the polarized light is linearly polarized light. Further, in this embodiment, the polarization direction of the linearly polarized light is perpendicular to the optical path, the reflective polarizer 12 is disposed corresponding to the display 10, receives the polarized light emitted by the display 10, and partially transmits and partially reflects the polarized light, and particularly the reflective polarizer 12 used in the present invention comprises two polarization directions perpendicular to and parallel to the optical path, the perpendicular is a transmission axis, and the horizontal is a reflection axis, the first phase retarder 14 is disposed corresponding to the reflective polarizer 12, and is used for receiving the polarized light partially transmitted from the reflective polarizer 12 and performing a first phase retardation, the partially transmitting partially reflecting element 16 is disposed corresponding to the first phase retarder 14, and partially transmitting the light passing through the first phase retarder 14, the second phase retarder 18 is disposed corresponding to the partially transmitting partially reflecting element 16, and receiving the light partially transmitting the partially reflecting element 16, and performing a phase retardation, the linear polarizer 20 is disposed corresponding to the second phase retarder 18, and is used for transmitting the polarized light only passing through the second phase retarder and the fourth phase retarder and directing the polarized light passing through the lens 24 to the eye 24.
In particular, the present invention increases the 1/4 wavelength phase retardation by 45 degrees between the fast and slow axes of the first retarder 14 and the transmission axis of the reflective polarizer 12.
In addition, the three lenses 22 of the present invention are disposed on either side of at least one element in the optical module, respectively, and in the example of the embodiment of fig. 2, the three lenses 22 are disposed between the partially transmissive partially reflective element 16 and the first retarder 14. Each lens may be a single lens or a multi-piece lens, and specifically, the lens may be one of a spherical lens, an aspherical lens, and a fresnel lens (FRESNEL LENS), or may be a multi-piece lens formed by combining at least one of a spherical lens, an aspherical lens, and a fresnel lens.
Referring to fig. 3A to 3C, in the specific step flow of the present invention, firstly, in fig. 3A, the display screen 10 outputs an image and emits polarized light to the reflective polarizer 12, the reflective polarizer 12 transmits the polarized light to the first retarder 14 partially, and reflects the polarized light back to the display screen 10 partially, and the polarized light transmitted through the reflective polarizer 12 passes through the first retarder 14, then undergoes a first phase retardation, and reaches the partially transmitting and partially reflecting element 16; referring to fig. 3B, the polarized light after the first phase delay is partially transmitted at the partially transmitting and partially reflecting element 16, and partially reflected back to the first phase delay plate 14 for the second phase delay, wherein the polarized light after the partially transmitting and partially reflecting element 16 is energy-lost, and the polarized light after the first phase delay is transmitted through the first phase delay plate 14 and then reaches the reflective polarizing plate 12, referring to fig. 3C, the polarized light after the second phase delay is reflected by the reflective polarizing plate 12, and then is reflected back to the first phase delay plate 14 for the third phase delay, and then passes through the partially transmitting and partially reflecting element 16, and the polarized light after the partial transmitting is transmitted through the second phase delay plate 18 (after the third phase delay) and then is transmitted through the second phase delay plate 18 for the fourth phase delay, and then the polarized light after the fourth phase delay is filtered through the linear polarizing plate 20, and only the polarized light after the fourth phase delay is transmitted through the linear polarizing plate 20 and is guided into at least one eye 24 by the lens 22.
Since the first phase retarder 14 and the second phase retarder 18 are each an odd multiple of 1/4 wavelength, they are each delayed by an integer multiple of one wavelength after four phase delays.
The linearly polarized light is converted into circularly polarized light including both left circularly polarized light and right circularly polarized light after passing through the first phase retarder 14. However, when a part of the circularly polarized light is reflected back to the first phase retarder 14 by the partially penetrating partially reflecting element 16, it becomes linearly polarized light, and then passes through the first phase retarder 14 again and is converted into circularly polarized light, but passes through the second phase retarder 18, and is converted into linearly polarized light.
In addition, one or more linear polarizers, circular polarizers or phase retarders can be added between the display 10 and the reflective polarizer 12 according to the polarization of the display 10 to adjust the polarization state of the display 10, and the linear polarizers, circular polarizers or phase retarders can be made of thin film materials or optical films, which can be coated, coated or adhered on the display 10 or the reflective polarizer 12. For example, if the light emitted from the display 10 is not linearly polarized light but circularly polarized light, a third phase retarder or a circularly polarizing plate is added behind the display 10 to convert the circularly polarized light emitted from the display 10 into linearly polarized light after passing through the third phase retarder or the circularly polarizing plate, or if the light emitted from the display 10 is unpolarized light without a specific polarization state, another linearly polarizing plate is added behind the display 10 to convert the unpolarized light emitted from the display 10 into linearly polarized light after passing through the linearly polarizing plate.
Fig. 4A-4E illustrate embodiments of various configurations of three lenses, a first lens 30, a second lens 32, and a third lens 34, wherein the third lens 34 is the lens closest to the display screen 10, and the first lens 30 is the lens closest to the human eye 24. This embodiment is not limited to the method of arranging lenses in the present invention, and any method is also included in the scope of the present invention as long as at least three lens groups for focusing are provided on either side of at least one of the reflective polarizer 12, the first phase retarder 14, the partially transmissive partially reflective element 16, the second phase retarder 18, and the linear polarizer 20.
Further, the reflective polarizer 12, the first retarder 14, the partially transmissive partially reflective element 16, the second retarder 18, and the linear polarizer 20 may be made of a thin film material or an optical film, and may be coated, coated or bonded on at least one of the above lenses or at least one plate glass, for example, the reflective polarizer 12 and the partially transmissive partially reflective element 16 may be a film coated on the lens, or a lens with a reflective polarizing function or an optical material in the form of a thin film may be attached to the lens, so that the reflective polarizer 12 and the first retarder 14 may be integrally formed, the partially transmissive partially reflective element 16 and the second retarder 18 may be integrally formed, for example, as shown in fig. 4A, the reflective polarizer 12 and the first retarder 14 may be the same lens group 34 (in this embodiment, the second lens group 34 is a single lens), for example, the reflective polarizer 12 and the partially transmissive partially reflective polarizer 18 may be disposed on the side of the first retarder 14 near the display screen 10 or the same lens with a phase retarding and reflective polarizing function may be achieved by using a special material, and the partially transmissive partially reflective polarizer 20 may be sequentially disposed on the first lens group 16 and the left side of the reflective polarizer 20 (in this embodiment, the first lens group is partially transmissive and partially reflective polarizer 20 may be sequentially disposed on the side of the lens group). In other words, in the embodiment of fig. 4A, the first lens 30 is disposed between the second lens 32 and the partially transmissive partially reflective element 16, the second lens 32 is disposed between the first lens 30 and the third lens 34, and the third lens 34 is disposed between the second lens 32 and the reflective polarizer 12, the first retarder 14. The specific data for this example are shown in Table one and Table two below:
Table one, lens parameters
Table two, aspherical coefficient
A, B, C, D, E, K and the like in the second table above are parameters in an aspheric equation, and the aspheric equation is thatWhere c=1/R, R is the radius of curvature and K is the conic coefficient. In addition, L1, L2, L3 in the table represent the effective focal lengths of the first, second, and third lenses, respectively, f1, f2, and f3 are the effective focal lengths of the first, second, and third lenses, respectively, f s4 is the focal length of the reflective surface of the partially transmissive reflective element, f s5 is the focal length of the reflective surface of the reflective polarizer, f is the effective focal length of the ultra-short eyepiece system, ω is the half angle of view of the ultra-short eyepiece system, TTL is the total length of the ultra-short eyepiece system, nd is the refractive index (REFRACTIVE INDEX), vd is the Abbe number (Abbe number) or the dispersion coefficient (V-number).
Fig. 4B shows another embodiment in which the reflective polarizer 12 and the first retarder 14 are disposed on the right side of the second lens element 32, and the partially transmissive partially reflective element 16, the second retarder 18 and the linear polarizer 20 are disposed on the left side of the first lens element 30. The specific data for this example are shown in tables three and four below:
table three, lens parameters
Table four, aspherical coefficients
Fig. 4C, 4D and 4E show three other arrangements of the first lens 30, the second lens 32 and the third lens 34, and the first lens 30, the second lens 32 and the third lens 34 may be a single lens or a combination of multiple lenses, and may be concave lenses, convex lenses, etc., and the concave-convex directions may also be changed, so that various combinations may be generated.
In the embodiment of fig. 4C, the reflective polarizer 12 and the first retarder 14 are disposed on the left side of the third lens 34, the second lens 32 is disposed on the left side of the first retarder 14, and the partially transmissive partially reflective element 16, the second retarder 18 and the linear polarizer 20 are disposed on the left side of the third lens. Specific data for this example are shown in tables five and six below:
Table five, lens parameters
Table six, aspherical coefficients
Unlike the embodiment of fig. 4C, the second phase retarder 18 and the linear polarizer 20 of this embodiment are separate elements. The specific data for this example are shown in tables seven and eight below:
Seven table, lens parameters
Table eight, aspherical coefficient
In the embodiment of fig. 4E, the reflective polarizer 12 and the first retarder 14 are separate elements and are disposed on the right side of the third lens 34, and the partially transmissive partially reflective element 16, the second retarder 18 and the linear polarizer 20 are disposed on the right side of the first lens 30 in this order. Specific data for this example are shown in tables nine and ten below:
Table nine, lens parameters
Table ten, aspherical coefficient
Further, the second phase retarder 18 and the linear polarizer 20 may be integrated, for example, as shown in fig. 4E, the second phase retarder 18 and the linear polarizer 20 are both on the same side of the same lens 30, and may be equivalent to the function of a circular polarizer.
The ultra-short distance eyepiece system of the present invention can achieve the effects of larger viewing angle, shorter system distance and good aberration correction, please refer to fig. 4A, and the ultra-short distance eyepiece system must satisfy the following conditions (1) and (2):
(1) And
(2)
Wherein f 1 is the effective focal length of the first lens;
f 2 is the effective focal length of the second lens;
f 3 is the effective focal length of the third lens;
F is the effective focal length of the ultra-short distance eyepiece system;
r1 is the curvature radius of one side of the first lens close to the human eye;
R2 is the curvature radius of one side of the first lens close to the display screen;
r3 is the curvature radius of one side of the second lens close to the human eye;
R4 is the curvature radius of one side of the second lens close to the display screen;
r5 is the radius of curvature of the side of the third lens adjacent to the human eye, and
R6 is the radius of curvature of the side of the third lens adjacent to the display screen.
Preferably, the ultra-short distance eyepiece system of the present invention satisfies any one of the following conditions (3) to (6):
(3)
(4)
(5) And
(6)
Wherein f s4 is the focal length of the reflecting surface of the partially penetrating partially reflecting element;
f s5 is the focal length of the reflective surface of the reflective polarizer;
TTL is the total length of the ultra-short distance eyepiece system, and
Ω is the half field view angle of the ultra short distance eyepiece system.
The above conditions (1), (3) and (4) can achieve the effects of reducing the system thickness and optical magnification, the condition (2) can achieve good aberration balance and obtain better image quality, and the conditions (5) and (6) can achieve the advantages of larger viewing angle and light and thin.
In the embodiment of fig. 4A to 4E, the optical path from the display screen 10 to the optical element before the human eye 24 is reflected for multiple times, and the total optical path length of each reflection of the light from the display screen 10 to the optical element before the human eye 24 is assumed to be d in the embodiment of fig. 4A to 4E, which is almost the same as the optical path length d from the display screen 10 to the lens 22 in the prior art of fig. 1, but because the optical path from the display screen 10 to the human eye is obtained by adding up the multiple reflections in the embodiment of fig. 4A to 4E, the length from the display screen 10 to the human eye is actually much smaller than the length from the display screen 10 to the human eye 24 in fig. 1, so as to achieve the purpose of shortening the length of the optical system.
In summary, the ultra-short distance eyepiece system provided by the invention realizes an ultra-short distance optical architecture by utilizing the phase delay and reflection of light for a plurality of times, and simultaneously, can achieve good aberration performance and image quality under a short distance and a large field of view by matching three lenses on the architecture for focal length adjustment. In addition, the ultra-short distance eyepiece system provided by the invention can be used for myopia adjustment, has an imaging range of phi 7 mm-phi 52mm, is suitable for 0.3-3 inches of a screen, provides a small-size screen with higher image quality, and can achieve the purposes of light weight, thinness and miniaturization of products applying an optical system due to the shortened length of the eyepiece system, and is particularly suitable for wide-angle lenses or wide-angle eyepieces on products such as head-mounted displays, game machines and the like.
The foregoing description is only of the preferred embodiment of the invention and is not intended to limit the scope of the invention. Therefore, all equivalent changes or modifications with the characteristics and spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. An ultra-short range eyepiece system comprising:
a display screen for outputting the image and emitting light;
An optical module, comprising:
the reflective polaroid is arranged corresponding to the display screen, receives the light from the display screen and enables the light to partially penetrate and partially reflect;
A first phase retarder corresponding to the reflective polarizer, the receiving part penetrating the light of the reflective polarizer and performing a first phase retardation;
A part of the penetrating part reflecting element is arranged corresponding to the first phase delay plate, so that the light delayed by the first phase is partially penetrated through the part penetrating part reflecting element, and partially reflected back to the first phase delay plate to carry out second phase delay and third phase delay;
The second phase delay plate is arranged corresponding to the partial transmitting and partial reflecting element, and the receiving part transmits the light which passes through the partial transmitting and partial reflecting element and is subjected to second phase delay and third phase delay and carries out fourth phase delay;
and a linear polarizer disposed corresponding to the second phase retarder for allowing the light having undergone the phase retardation twice to pass through without passing through and allowing the light having undergone the phase retardation four times to pass through; the plurality of lenses comprise a first lens, a second lens and a third lens which are respectively arranged on any side of at least one of the optical modules, the image output by the display screen is guided into at least one human eye, the third lens is the lens closest to the display screen, and the first lens is the lens closest to the human eye;
the first lens, the second lens and the third lens are single-piece lenses or multi-piece lenses, wherein the single-piece lenses are spherical lenses or aspherical lenses, and the multi-piece lenses are formed by at least one of spherical lenses and aspherical lenses;
The ultra-short distance eyepiece system satisfies the following conditions (1) and (2):
(1)
(2) Wherein f1 is the effective focal length of the first lens;
f2 is the effective focal length of the second lens;
f3 is the effective focal length of the third lens;
F is the effective focal length of the ultra-short distance eyepiece system;
r1 is the curvature radius of one side of the first lens close to the human eye;
R2 is the curvature radius of one side of the first lens close to the display screen;
r3 is the curvature radius of one side of the second lens close to the human eye;
R4 is the curvature radius of one side of the second lens close to the display screen;
R5 is the radius of curvature of the side of the third lens close to the human eye, and R6 is the radius of curvature of the side of the third lens close to the display screen;
at least one of the reflective polarizer, the first phase retarder, the partially reflective partially transmissive element, the second phase retarder and the linear polarizer is a thin film material or an optical coating, and is disposed on at least one of the plurality of lenses or at least one sheet glass in a coating, coating or bonding manner.
2. The ultra-short distance eyepiece system according to claim 1 further satisfying any one of the following conditions (3) - (6):
(3)(4)(5) (6) Wherein fs4 is the focal length of the reflecting surface of the partially penetrating partially reflecting element;
fs5 is the focal length of the reflective polarizer reflective surface;
TTL is the total length of the ultra-short distance eyepiece system, and ω is the half field angle of view of the ultra-short distance eyepiece system.
3. The ultra-short eyepiece system according to claim 1 wherein the light reflected back to the first retarder by the partially transmissive partially reflective element passes through the second phase retardation of the first retarder, passes through the first retarder to reach the reflective polarizer, and completes reflection on the reflective polarizer, and the light is reflected back to the first retarder for the third phase retardation, and then passes through the first retarder and the partially transmissive partially reflective element to reach the second phase retarder.
4. The ultra-short eyepiece system according to claim 1 wherein the first, second, third, and fourth phase delays are all increased by an odd multiple of a quarter wavelength to delay light reaching the human eye by an integer multiple of a wavelength.
5. The ultra-short distance eyepiece system according to claim 1 wherein the light rays sent out of the display screen and into the reflective polarizer are linearly polarized light.
6. The ultra-short distance eyepiece system according to claim 5 wherein the linearly polarized light passes through the first phase retarder and then is converted to left circularly polarized light or right circularly polarized light.
7. The ultra-short distance eyepiece system according to claim 1 wherein the light emitted from the display screen and entering the reflective polarizer is circularly polarized light, and a third phase retarder or a circularly polarizer is further disposed between the display screen and the reflective polarizer, such that the circularly polarized light is converted into linearly polarized light after passing through the third phase retarder or the circularly polarizer.
8. The ultra-short distance eyepiece system according to claim 1 wherein the light transmitted from the display screen and entering the reflective polarizer is unpolarized light, and a further linear polarizer is disposed between the display screen and the reflective polarizer to convert the unpolarized light into linearly polarized light after passing through the further linear polarizer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110212354.2A CN114967135B (en) | 2021-02-25 | 2021-02-25 | Ultra-short throw eyepiece system |
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| CN116224555B (en) * | 2023-02-17 | 2025-09-26 | 浙江舜宇光学有限公司 | A visual optical system |
| CN116400481A (en) * | 2023-04-10 | 2023-07-07 | 常州市瑞泰光电有限公司 | Optical module and VR equipment |
| CN116755250A (en) * | 2023-05-15 | 2023-09-15 | 华勤技术股份有限公司 | an optical system |
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