CN114967135A - Ultra-short distance ocular lens system - Google Patents
Ultra-short distance ocular lens system Download PDFInfo
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- CN114967135A CN114967135A CN202110212354.2A CN202110212354A CN114967135A CN 114967135 A CN114967135 A CN 114967135A CN 202110212354 A CN202110212354 A CN 202110212354A CN 114967135 A CN114967135 A CN 114967135A
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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
Abstract
An ultra-short distance ocular lens system comprises a display screen, an optical module and a plurality of lenses, wherein the optical module comprises a reflective polarizer, a first phase retarder, a partially-transmitting partially-reflecting element, a second phase retarder and a linear polarizer which are sequentially arranged in front of the display screen, and 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 invention realizes an ultra-short-distance optical framework by performing phase delay and reflection on light rays for multiple times, and simultaneously, the optical framework is matched with three lenses to adjust the focal length, thereby achieving good aberration performance and image quality in a large field of view.
Description
Technical Field
The present invention relates to the field of optical technologies, and in particular, 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, and is usually in the form of an eye mask or a helmet, in which a display screen is placed close to the eyes of a user, and a focal length is adjusted through an optical path to project pictures to the eyes in a short distance, so as to generate a virtual reality effect and increase the sense of presence of the wearer.
Fig. 1 is a schematic diagram of an eyepiece system of a virtual reality head-mounted display, in which a display screen 10 projects an image, and the image passes through a light path with an optical path length d and then enters a lens 40, 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 length d of 40mm, the length of the head-mounted display is the optical length d plus the thickness of the lens, the eye distance, the housing, etc., which together are somewhat bulky for the eye mask and helmet to be worn on the head and may cause a burden on the nose bridge, crown, and neck of the user and thus may not be worn for a long time. Therefore, the technicians at present are dedicated to shorten the length of the eyepiece system in the head-mounted display to reduce the thickness of the head-mounted display for the convenience of the user.
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 high-specification image quality to meet the visual demands of consumers for experiencing virtual reality.
Disclosure of Invention
The present invention is directed to an ultra-short distance eyepiece system, which employs a three-lens design in an optical architecture to achieve a good aberration balance and improve image quality, and also can maintain an ultra-short distance and a large viewing angle of the eyepiece system. The eyepiece system can be applied to wide-angle lenses or wide-angle eyepieces arranged on products such as head-mounted displays, game machines and the like, and provides perfect visual experience for users.
Another objective of the present invention is to provide an ultra-short distance eyepiece system, which sequentially arranges optical elements such as a reflective polarizer, a first phase retarder, a partially transmissive partially reflective element, a second phase retarder and a linear polarizer behind a display screen and in front of human eyes, so as to shorten the overall length of the eyepiece system by using multiple phase delays and reflections of light, thereby miniaturizing a head-mounted display.
To achieve the above objective, the present invention provides an ultra-short distance eyepiece system, which includes a display screen, an optical module and a plurality of lenses. The display screen is used for outputting images and emitting light. The optical module includes: the reflective polarizing plate is arranged corresponding to the display screen, so that vertical polarized light in light rays penetrates through the reflective polarizing plate and horizontal polarized light is reflected; the first phase delay plate is arranged corresponding to the reflective polarizer, receives the light rays penetrating through the reflective polarizer and performs first phase delay; a partial transmission partial reflection element corresponding to the first phase retardation plate, so that the light beam after the first phase retardation partially penetrates the partial transmission partial reflection element, and the partial light beam is reflected back to the first phase retardation plate to perform the second phase retardation and the third phase retardation; a second phase delay piece which is arranged corresponding to the partial transmission partial reflection element and receives the light which is partially transmitted by the partial transmission partial reflection element and passes through the second phase delay and the third phase delay and carries out the fourth phase delay; and a polarizing plate disposed corresponding to the second phase retarder for allowing the light delayed by two times not to pass and allowing the light delayed by four times to pass. 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 and guide the image output by the display screen 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; meanwhile, the ultra-short distance eyepiece system must satisfy the following conditions (1) and (2):
(1)
and
(2)
wherein f is 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 radius of curvature of the first lens on the side closer to the human eye;
r2 is the curvature radius of the first lens near the display screen;
r3 is the radius of curvature of the side of the second lens closer to the human eye;
r4 is the curvature radius of the side of the second lens close to the display screen;
r5 is the radius of curvature of the side of the third lens closer to the human eye; and
r6 is the radius of curvature of the side of the third lens near the display screen.
According to an embodiment of the present invention, the aforementioned lens includes a single-piece lens or a multi-piece lens. Wherein, the single lens is a spherical lens, an aspherical lens or a Fresnel lens; the multi-piece lens is composed of at least one of a spherical lens, an aspherical lens and a Fresnel lens.
According to the embodiment of the present 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 is s4 A focal length of the partially transmissive partially reflective element reflective surface;
f s5 the focal length of the reflecting surface of the reflecting polaroid;
TTL is the total length of the ultra-short distance eyepiece system; and
omega is the half field angle of view of the ultra-short distance eyepiece system.
According to the embodiment of the 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 film material or an optical coating, and is disposed on at least one of the lenses or at least one of the flat glasses in a coating, coating or bonding manner.
According to the embodiment of the invention, the first polarized light reflected back to the first phase retarder by the partially transmissive partially reflective element passes through the first phase retarder after the second phase retardation of the first phase retarder, reaches the reflective polarizer through the first phase retarder, is reflected on the reflective polarizer, and is reflected back to the first phase retarder to perform the third phase retardation, so as to form the second polarized light, and the second polarized light passes through the first phase retarder and the partially transmissive partially reflective element and reaches the second phase retarder.
According to the embodiment of the invention, the first, second, third and fourth time phase delays are increased by the phase delay of 1/4 odd times of wavelength, so that the light reaching the human eye is delayed by an integral multiple of 1 wavelength.
According to the embodiment of the invention, the light rays sent out by the display screen and entering the reflective polarizer are linearly polarized light; further, the linearly polarized light is converted into left circularly polarized light or right circularly polarized light after passing through the first phase retarder.
According to the embodiment of the invention, the light rays sent out by the display screen and entering the reflective polarizer are 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 rays sent out by the display screen and entering the reflective polarizer are non-polarized light, and another linear polarizer is arranged between the display screen and the reflective polarizer, so that the non-polarized light is converted into linearly polarized light after passing through the other linear polarizer.
The purpose, technical content, features and effects of the present invention will be more easily understood through the detailed description of the specific embodiments below.
Drawings
Fig. 1 is a schematic diagram of an optical path between a display screen of a head-mounted display and a human eye 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 flow charts of steps of the ultra-short distance eyepiece system of the present invention.
Fig. 4A to 4E are schematic diagrams illustrating different configurations of three lenses in the ultra-short distance eyepiece system of the present invention.
Description of reference numerals: 10-a display screen; 12-a reflective polarizer; 14-a first phase retarder; 16-partially transmissive partially reflective element; 18-a second phase delay plate; 20-linear polarizer; 22-a lens; 24-human eye; 26-plate glass; 30-a first lens; 32-a second lens; 34-a third lens; 40-a lens; d-optical path length.
Detailed Description
The invention provides an ultrashort distance ocular lens system, which is applied to a head-mounted display, and utilizes a plurality of optical elements to reflect light for a plurality of times, and a plurality of lenses are matched in the optical elements, so that aberration balance can be effectively achieved, the image quality is improved, the whole ocular lens system is shortened under the optical path with the same length, and the head-mounted display is miniaturized.
Please refer to fig. 2, which is a schematic diagram of an embodiment of an ultra-short distance eyepiece system according to the present invention. The ultra-short-distance eyepiece system of the embodiment comprises 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 in sequence between a display screen 10 and at least a human eye 24. The display screen 10 outputs an image and emits light, the light is polarized light or unpolarized light, and when the light is polarized light, the polarized light can be linearly polarized light, circularly polarized light or other polarization states; in this embodiment, the polarized light is linearly polarized light. Further, the polarization direction of the linearly polarized light in this embodiment is perpendicular to the optical path; the reflective polarizer 12 is disposed corresponding to the display screen 10, receives the polarized light emitted by the display screen 10, and partially transmits and partially reflects the polarized light, and particularly, the reflective polarizer 12 used in the present invention includes two polarization directions perpendicular and parallel to the light path, where the perpendicular is a transmission axis and the horizontal is a reflection axis; a first phase retarder 14 disposed corresponding to the reflective polarizer 12 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 retardation plate 14, receives the light passing through the first phase retardation plate 14, partially reflects and partially transmits the light passing through; the second phase retardation plate 18 is disposed corresponding to the partially-transmissive partially-reflective element 16, receives the light partially transmitted through the partially-reflective element 16, and performs phase retardation; the linear polarizer 20 is disposed corresponding to the second phase retarder 18, and the linear polarizer 20 is configured to let the polarized light with two phase retardations not pass through and let the polarized light with four phase retardations pass through, and guide the image into the human eye 24 through the lens 22.
In particular, the present invention increases the retardation at 1/4 wavelengths by making the fast and slow axes of the first retardation film 14 form an angle of 45 degrees with respect to the transmission axis of the reflective polarizer 12.
In addition, the three lenses 22 of the present invention are respectively disposed on either side of at least one element in the optical module, and taking the embodiment of fig. 2 as an example, the three lenses 22 are disposed between the partially-transmissive partially-reflective element 16 and the first phase retarder 14. Each lens can be a single lens or a multi-lens; specifically, the lens may be a single-lens of one of a spherical lens, an aspherical lens and a Fresnel lens (Fresnel lens), or may be a multi-lens formed by combining at least one of a spherical lens, an aspherical lens and a Fresnel lens.
Referring to fig. 3A to 3C, firstly in fig. 3A, the display screen 10 outputs an image and emits polarized light to the reflective polarizer 12, the reflective polarizer 12 partially transmits the polarized light to the first phase retarder 14, and partially reflects the polarized light back to the display screen 10, and the partially transmitted polarized light passing through the reflective polarizer 12 passes through the first phase retarder 14, and then undergoes first phase retardation to reach the partially transmitting partial reflective device 16; referring to fig. 3B, the polarized light after the first time phase retardation partially penetrates through the partially transmissive partially reflective element 16, and a part of the polarized light is reflected back to the first phase retarder 14 for the second time phase retardation, where the polarized light partially penetrating through the partially reflective element 16 is energy loss, and the polarized light after the first time phase retardation penetrates through the first phase retarder 14 and reaches the reflective polarizer 12; referring to fig. 3C again, the reflective polarizer 12 reflects the polarized light after the second phase retardation, reflects the polarized light back to the first phase retarder 14 for the third phase retardation, and then passes through the partially transmissive partially reflective element 16, so that the partially transmissive polarized light (after the third phase retardation) reaches the second phase retarder 18 for the fourth phase retardation; the fourth time phase-delayed polarized light is transmitted through the second phase retarder 18, and is screened by the linear polarizer 20, so that only the fourth time phase-delayed polarized light passes through the linear polarizer 20 and is guided by the lens 22 into at least one human eye 24.
Since the first retarder 14 and the second retarder 18 are both phase-retarded by odd multiples of 1/4 wavelengths, they are phase-retarded by an integer multiple of one wavelength after four times of phase-retardation.
The linearly polarized light is converted into circularly polarized light after passing through the first phase retarder 14, and the circularly polarized light includes left circularly polarized light and right circularly polarized light. However, when part of the circularly polarized light is reflected back to the first retardation plate 14 by the partially transmissive and partially reflective element 16, the circularly polarized light is converted into linearly polarized light again, and then the linearly polarized light is converted into circularly polarized light through the first retardation plate 14, but is converted into linearly polarized light through the second retardation plate 18.
In addition, in the present invention, one or more linear polarizers, circular polarizers or phase retarders may be added between the display screen 10 and the reflective polarizer 12 according to the polarization condition of the display screen 10 to adjust the polarization state of the display screen 10, and the linear polarizers, the circular polarizers or the phase retarders may be made of a film material or an optical coating, and may be disposed on the display screen 10 or the reflective polarizer 12 in a coating, plating or bonding manner. For example, if the light emitted from the display screen 10 is not linearly polarized light but circularly polarized light, a third phase retarder or a circularly polarizing plate needs to be added behind the display screen 10, so that the circularly polarized light emitted from the display screen 10 is converted into linearly polarized light after passing through the third phase retarder or the circularly polarizing plate; or, if the light emitted from the display panel 10 is unpolarized light without a specific polarization state, another linear polarizer needs to be added behind the display panel 10, so that the unpolarized light emitted from the display panel 10 is converted into linearly polarized light after passing through the linear polarizer.
Fig. 4A to 4E illustrate various embodiments of three lenses, namely 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 intended to limit the method of disposing the lenses in the present invention, and at least three groups of lenses for focusing are included in the scope of the present invention as long as the lenses are disposed 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 material of the optical elements such as 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 may be a film material or an optical coating, and the optical elements are disposed on at least one of the lenses or at least one of the flat glasses by coating, coating or bonding, for example, the reflective polarizer 12 and the partially transmissive partially reflective element 16 may be a coating on the lens, or a lens with a reflective polarization function itself or an optical material in the form of a film is attached on the lens, so that the reflective polarizer 12 and the first phase retarder 14 are integrated, the partially transmissive partially reflective element 16 and the second phase retarder 18 are integrated, for example, as shown in fig. 4A, the reflective polarizer 12 and the first phase retarder 14 are the same lens group 34 (in this embodiment, the third lens group 34 is a single lens), for example, a reflective polarizing film is disposed on the first retarder 14 near the display 10 or a special material is used to achieve the phase retardation and reflective polarization function of the same lens, and a partially transmissive and partially reflective element 16 (in this embodiment, a partially transmissive and partially reflective film), a second retarder 18, a linear polarizer 20 and a plate glass 26 are disposed in sequence on the left side of the first lens group 30. 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 and the first phase retarder 14. The specific data for this example are shown in tables one and two below:
TABLE I lens parameters
TABLE II, aspheric coefficients
A, B, C, D, E, K, etc. in the second table above are parameters in the aspheric equation
Wherein C is 1/R, R is curvature radius, and K is cone coefficient. In addition, L1, L2, L3 in the table represent the first, second and third lenses, respectively, f1, f2 and f3 are the effective focal lengths of the first, second and third lenses, respectively, and f s4 Focal length for partially penetrating the reflecting surface of the partially reflecting element, f s5 F is the focal length of the reflecting surface of the reflective polarizer, f is the effective focal length of the ultra-short-distance eyepiece system, omega is the half-field angle of the ultra-short-distance eyepiece system, TTL is the total length of the ultra-short-distance eyepiece system, Nd is the Refractive index (Refractive index), and Vd is the Abbe number or the dispersion coefficient (V-number).
In another embodiment, shown in FIG. 4B, the reflective polarizer 12 and the first retarder 14 are disposed on the right side of the second lens 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 30. Specific data for this example are as follows in table three and table four:
TABLE III, lens parameters
TABLE IV, aspheric 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 can be a single lens or a combination of multi-lens, concave lens, convex lens, etc., and the concave-convex direction can be changed, so that various combinations can be generated.
In the embodiment of fig. 4C, the reflective polarizer 12 and the first phase 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 phase retarder 14, and the partially transmissive partially reflective element 16, the second phase retarder 18 and the linear polarizer 20 are disposed on the left side of the third lens. The specific data for this example are shown in tables five and six below:
TABLE V lens parameters
TABLE VI, aspheric coefficients
In the embodiment of fig. 4D, unlike the embodiment of fig. 4C, the second phase retarder 18 and the linearly polarizing plate 20 of this embodiment are formed as separate elements. The specific data for this example are shown in tables seven and eight below:
TABLE VII, lens parameters
TABLE VIII, aspheric coefficients
In the embodiment of fig. 4E, the reflective polarizer 12 and the first phase retarder 14 are formed as separate elements and are disposed on the right side of the third lens 34, and the partially transmissive partially reflective element 16, the second phase retarder 18, and the linear polarizer 20 are sequentially disposed on the right side of the first lens 30. Specific data for this example are shown in tables nine and ten below:
TABLE ninth, lens parameters
TABLE ten, aspheric coefficients
To explain further, the second phase retardation plate 18 and the linear polarizer 20 can be integrated into one body, for example, as shown in fig. 4E, the second phase retardation plate 18 and the linear polarizer 20 are both on the same side of the same lens 30, which is equivalent to the function of a circular polarizer.
The ultra-short distance eyepiece system of the present invention can achieve a larger viewing angle, a shorter system distance, and a better aberration correction effect, and referring to fig. 4A, 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 radius of curvature of the first lens on the side closer to the human eye;
r2 is the curvature radius of the first lens near the display screen;
r3 is the radius of curvature of the side of the second lens closer to the human eye;
r4 is the curvature radius of the side of the second lens close to the display screen;
r5 is the radius of curvature of the side of the third lens closer to the human eye; and
r6 is the radius of curvature of the side of the third lens near 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 is s4 Is the focal length of the partially transmissive partially reflective element reflective surface;
f s5 the focal length of the reflecting surface of the reflecting polaroid;
TTL is the total length of the ultra-short distance eyepiece system; and
omega is the half field angle of view of the ultra-short distance eyepiece system.
The above conditions (1), (3) and (4) can achieve the effects of reducing the thickness of the system 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 weight.
The invention uses the polarization principle to make the light path internally refracted and reflected in the optical system to achieve the effect of shortening the distance between the display screen and the human eyes, taking fig. 4A to 4E as an example, the optical path of the optical element after the polarized light is emitted from the display screen 10 and before the human eye 24 is reflected for multiple times, assuming that in the embodiment of fig. 4A to 4E, the length of each reflection of light from the display 10 to the optical elements in front of the human eye 24, summed together, is the optical path d, which is nearly the same as the optical path d from the display 10 to the lens 22 in the prior art of figure 1, however, since in the embodiments of fig. 4A to 4E, the light path from the display screen 10 to the human eye is obtained by summing up multiple reflections, therefore, the length from the display screen 10 to the human eye is actually much shorter than the length from the display screen 10 to the human eye 24 in fig. 1, so as to shorten 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 performing phase delay and reflection on light rays for multiple times, and meanwhile, good aberration performance and image quality can be achieved under short distance and large field of view by matching three lenses on the architecture for focal length adjustment. Moreover, the ultra-short distance eyepiece system provided by the invention can be used for the function of myopia regulation, and the imaging range is as follows: phi 7 mm-phi 52mm, suitable for 0.3 inch-3 inch screen, providing higher image quality of small-size screen, and because the length of ocular lens system is shortened, the product using optical system can achieve the purpose of lightness, thinness and miniaturization, especially suitable for wide-angle lens or wide-angle ocular lens on products such as head-mounted display, game machine, etc.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all the equivalent changes or modifications of the features and the spirit described in the scope of the application of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An ultra-short-range eyepiece system, comprising:
a display screen for outputting images and emitting light;
an optical module, comprising:
a reflection type polaroid which is arranged corresponding to the display screen, receives the light from the display screen, and makes the light partially penetrate and partially reflect;
a first phase retardation plate arranged corresponding to the reflective polarizer, receiving the light beam partially penetrating the reflective polarizer, and performing a first phase retardation;
a partial transmission partial reflection element corresponding to the first phase retardation plate, so that the light beam after the first phase retardation partially penetrates the partial transmission partial reflection element, and partially reflects back to the first phase retardation plate for the second phase retardation and the third phase retardation;
a second phase delay plate, which is arranged corresponding to the partial transmission partial reflection element, receives the light which partially penetrates the partial transmission partial reflection element and passes through the second phase delay and the third phase delay, and carries out the fourth phase delay; and
a line polarizer disposed corresponding to the second phase retarder for allowing the light beam with twice phase retardation not to pass through and allowing the light beam with four times phase retardation to pass through; and
a plurality of lenses, including a first lens, a second lens and a third lens, respectively disposed on either side of at least one of the optical modules, for guiding the image output by the display screen into at least one human eye, wherein the third lens is the lens closest to the display screen, and the first lens is the lens closest to the human eye;
the ultra-short distance eyepiece system satisfies the following conditions (1) and (2):
(1)
and
(2)
wherein f is 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 radius of curvature of the first lens on the side closer to the human eye;
r2 is the curvature radius of the first lens near the display screen;
r3 is the radius of curvature of the side of the second lens closer to the human eye;
r4 is the curvature radius of the side of the second lens close to the display screen;
r5 is the radius of curvature of the side of the third lens closer to the human eye; and
r6 is the radius of curvature of the side of the third lens near the display screen.
2. The ultra-short distance eyepiece system of claim 1, wherein the plurality of lenses comprises a single lens or a multi-piece lens.
3. The ultra-short distance eyepiece system of claim 2, wherein the single-chip lens is a spherical lens, an aspherical lens, or a fresnel lens.
4. The ultra-short distance eyepiece system of claim 2, wherein the multi-piece lens is comprised of at least one of a spherical lens, an aspherical lens and a fresnel lens.
5. The ultra-short distance eyepiece system of claim 1, further satisfying any one of the following conditions (3) to (6):
(3)
(4)
(5)
and
(6)
wherein, f s4 A focal length of the partially transmissive partially reflective element reflective surface;
f s5 the focal length of the reflecting surface of the reflecting polaroid;
TTL is the total length of the ultra-short distance eyepiece system; and
omega is the half field angle of view of the ultra-short distance eyepiece system.
6. The system of claim 1, wherein 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 film material or an optical coating and is disposed on at least one of the plurality of lenses or at least one flat glass by coating, coating or bonding.
7. The system of claim 1, wherein the light reflected by the partially transmissive partially reflective element back to the first phase retarder passes through the first phase retarder to the reflective polarizer after the second phase retardation of the first phase retarder, and is reflected by the reflective polarizer to be reflected back to the first phase retarder for the third phase retardation, and then passes through the first phase retarder and the partially transmissive partially reflective element to reach the second phase retarder.
8. The system of claim 1, wherein the first, second, third and fourth phase delays are increased by a phase delay of an odd multiple of a quarter wavelength such that light reaching the human eye is delayed by an integer multiple of a wavelength.
9. The system of claim 1, wherein the light rays exiting the display screen and entering the reflective polarizer are linearly polarized light.
10. The system of claim 9, wherein the linearly polarized light is converted into left circularly polarized light or right circularly polarized light after passing through the first phase retarder.
11. The system of claim 1, wherein the light transmitted from the display panel and entering the reflective polarizer is circularly polarized light, and a third retarder or a circular polarizer is disposed between the display panel and the reflective polarizer, such that the circularly polarized light is converted into linearly polarized light after passing through the third retarder or the circular polarizer.
12. The system of claim 1, wherein the light transmitted from the display screen and entering the reflective polarizer is unpolarized light, and another 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 other linear polarizer.
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| CN (1) | CN114967135A (en) |
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2021
- 2021-02-25 CN CN202110212354.2A patent/CN114967135A/en active Pending
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Effective date of registration: 20230425 Address after: Room 102, Building 1, No. 8 Shangsha Zhongnan Road, Chang'an Town, Dongguan City, Guangdong Province, 523000 Applicant after: Dongguan Shuangying Optoelectronic Technology Co.,Ltd. Address before: Taoyuan City, Taiwan, China Applicant before: SHUANGYING TECHNOLOGY Co.,Ltd. Applicant before: Dongguan Shuangying Photoelectric Technology Co.,Ltd. |
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