CN115128824A - Optical system - Google Patents
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- CN115128824A CN115128824A CN202210850884.4A CN202210850884A CN115128824A CN 115128824 A CN115128824 A CN 115128824A CN 202210850884 A CN202210850884 A CN 202210850884A CN 115128824 A CN115128824 A CN 115128824A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 95
- 230000010287 polarization Effects 0.000 claims abstract description 160
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- 210000001747 pupil Anatomy 0.000 claims description 9
- 238000002834 transmittance Methods 0.000 claims description 9
- 239000006096 absorbing agent Substances 0.000 claims 3
- 239000006117 anti-reflective coating Substances 0.000 claims 2
- 230000004379 myopia Effects 0.000 description 30
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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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
- G02B27/0101—Head-up displays characterised by optical features
Abstract
An optical system provided in an embodiment of the present invention includes: the display screen, the first polarization component, the first lens, the second lens and the second polarization component; the first lens is a plastic lens; the second lens is a glass lens; the display screen is used for transmitting a first light ray to the first polarization component; the first polarization component is used for converting the first light into first circularly polarized light and transmitting the first circularly polarized light to the first lens; the first lens is used for transmitting the first circular polarized light to the second lens; the second lens is used for transmitting the first circular polarized light to the second polarization component; the second polarization assembly is used for converting the first circular polarization light into second circular polarization light and transmitting the second circular polarization light to the second lens; the second lens is also used for transmitting the second circular polarized light to the first lens; the first lens is used for reflecting the second circular polarized light to the second polarization component; the second polarization component is used for converting the second circular polarization into a first linear polarization, and the first linear polarization is used for forming an image on human eyes.
Description
Technical Field
The embodiment of the invention relates to the technical field of optics, in particular to an optical system.
Background
Virtual Reality (VR) is a three-dimensional Virtual world manufactured by a computer, and provides a visual, tactile and auditory interactive scene for a user, so that the user feels and experiences his own situation and is immersed in the Virtual world, and at the same time, the user can observe and interact with objects in a three-dimensional space. Wherein the optical system is an important component of the VR device, the optical system can provide an immersive virtual picture.
The current optical system has the ghost problem, and the use feeling of a user is reduced. How to reduce the ghost problem of the optical system is a technical problem which needs to be solved at present.
Disclosure of Invention
The embodiment of the invention provides an optical system, which is used for solving the ghost problem of the optical system in the prior art.
In a first aspect, an embodiment of the present invention provides an optical system, including: the display screen, the first polarization component, the first lens, the second lens and the second polarization component; the first lens is a plastic lens; the second lens is a glass lens; the display screen is used for transmitting a first light ray to the first polarization component; the first polarization component is used for converting the first light into first circularly polarized light and transmitting the first circularly polarized light to the first lens; the first lens is used for transmitting the first circular polarization light to the second lens; the second lens is used for transmitting the first circular polarization light to the second polarization component; the second polarization assembly is used for converting the first circular polarization into second circular polarization and transmitting the second circular polarization to the second lens; the second lens is further for transmitting the second circularly polarized light to the first lens; the first lens is further used for reflecting the second circularly polarized light to the second polarizing component; the second polarizing component is further configured to convert the second circularly polarized light into a first linearly polarized light, the first linearly polarized light being configured to form an image on a human eye.
In the embodiment of the invention, through the combination of the first lens and the second lens, the first lens bears most of focal power, and the second lens bears part of focal power, so that the problems of ghost and stray light in an optical system can be solved, and aberrations such as spherical aberration, chromatic aberration, coma aberration and the like can be effectively eliminated.
Optionally, the first polarization assembly includes a first polarization absorption film, a first quarter-wave plate; the first polarization absorption film is used for transmitting first linear vibration light in the first light rays and absorbing second linear vibration light in the first light rays; the first quarter-wave plate is used for converting the first linearly polarized light into first circularly polarized light and transmitting the first circularly polarized light to the first lens.
In an embodiment of the present invention, the first polarization assembly includes a first polarization absorbing film and a first quarter-wave plate. The first polarization absorption film has the functions of transmitting linear polarization light which is consistent with the polarization direction of the first polarization absorption film and absorbing linear polarization light which is perpendicular to the polarization direction of the transmission light. The first quarter-wave plate is used for converting linear polarization into circular polarization and converting the circular polarization into linear polarization.
Optionally, the optical system further comprises a second polarizing absorbing film; the second polarized absorption film is used for transmitting the first linear polarized light to human eyes to form images.
In the embodiment of the invention, the second polarization absorption film has the functions of transmitting the linearly polarized light which is in accordance with the polarization direction of the second polarization absorption film to human eyes to form images and absorbing the linearly polarized light which is perpendicular to the polarization direction of the transmitted light.
Optionally, the second polarization component includes a second quarter-wave plate and a polarization reflection film; the second quarter-wave plate is used for converting the first circular polarization into second linear polarization and transmitting the second linear polarization to the polarization reflection film; the polarization reflection film is used for reflecting the second linearly polarized light to the second quarter-wave plate; the second quarter-wave plate is further used for converting the second linear polarization into second circular polarization and transmitting the second circular polarization to the second lens and the first lens; the second quarter wave plate is also used for converting the second circular polarization into a first linear polarization; the polarizing reflective film is also used for transmitting the first linear polarization light to the second polarizing absorption film.
In an embodiment of the present invention, the second polarization component includes a second quarter-wave plate and a polarization reflection film. The second quarter-wave plate is used for converting the polarization state of light. The second quarter-wave plate can convert linear polarization into circular polarization and can also convert the circular polarization into linear polarization. The polarizing reflective film functions to selectively transmit linearly polarized light while reflecting linearly polarized light perpendicular to the vibration direction of the transmitted linearly polarized light.
Optionally, a first antireflection film is plated on a surface of the first lens close to the first polarization component, a semi-transparent and semi-reflective film is plated on a surface of the first lens close to the second lens, a first transmittance of the first antireflection film is greater than a first threshold, a second transmittance of the semi-transparent and semi-reflective film ranges from [ 30% to 70% ], and a first reflectance of the semi-transparent and semi-reflective film ranges from [ 30% to 70% ].
In an embodiment of the invention, the first lens includes a half-transparent film and a first anti-reflection film, wherein the first anti-reflection film is used for reducing a ghost image problem caused by reflection of the first lens and reducing stray light caused by reflection of the first lens. The effect of the semi-transparent semi-reflective film is that the light path can be folded, so that the total length of the optical system can be greatly reduced, the whole optical system is light and thin, and the experience of a user is improved.
Optionally, a second antireflection film is plated on a surface of the second lens close to the first lens, and a third transmittance of the second antireflection film is greater than a first threshold.
In the embodiment of the invention, the second antireflection film has the function of reducing the ghost image problem caused by the reflection of the second lens and reducing the stray light caused by the reflection of the second lens.
Optionally, an included angle between the direction of the transmission axis of the first polarization absorption film and the direction of the transmission axis of the first quarter-wave plate is 45 ° ± 0.5 °.
In the embodiment of the invention, the range of an included angle between the direction of the transmission axis of the first polarization absorption film and the direction of the transmission axis of the first quarter-wave plate is limited to 45 degrees +/-0.5 degrees, so that the linear polarization can be converted into the circular polarization.
Optionally, the direction of the transmission axis of the polarization reflection film is consistent with the direction of the transmission axis of the second polarization absorption film.
In the embodiment of the invention, the direction of the light transmission axis of the first polarization absorption film is consistent with that of the light transmission axis of the second polarization absorption film, so that less stray light can enter human eyes.
Optionally, the direction of the transmission axis of the first polarization absorption film is consistent with the direction of the transmission axis of the second polarization absorption film.
In the embodiment of the invention, the direction of the light transmission axis of the first polarization absorption film is consistent with that of the light transmission axis of the second polarization absorption film, so that less stray light can enter human eyes.
Optionally, the direction of the optical axis of the first quarter-wave plate is consistent with the direction of the optical axis of the second quarter-wave plate.
In the embodiment of the invention, the direction of the optical axis of the first quarter-wave plate is consistent with the direction of the optical axis of the second quarter-wave plate, so that less stray light can enter human eyes.
Optionally, the optical system has an entrance pupil range of [13mm, 20mm ].
In the embodiment of the present invention, the entrance pupil range of the optical system is set to [13mm, 20mm ], so that the comfort of the user can be improved when the user uses the optical system.
The equivalent focal length F of the optical system ranges from [21mm, 25mm ].
In the embodiment of the present invention, the range of the equivalent focal length F of the optical system is determined to be [21mm, 25mm ], so that the comfort of the user in use can be improved.
Optionally, the first focal length f of the first lens 1 And the equivalent focal length F of the optical system is: f ≦ F 1 |≦2F。
In the embodiment of the invention, the first focal length f of the first lens is adjusted 1 The relationship between the range of (d) and the equivalent focal length F of the optical system is determined as: f ≦ F 1 | ≦ 2F, which may improve user comfort when in use.
Optionally, a second focal length f of the second lens 2 The relationship between the range of (a) and the equivalent focal length of the optical system is: 5F ≦ F 2 |≦10F。
In the embodiment of the invention, the second focal length f of the second lens is adjusted 2 Is determined as follows, and the equivalent focal length of the optical system is determined as follows: 5F ≦ F 2 | ≦ 10F, so that ghost stray light caused by reflection by the second lens can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an optical system according to an embodiment of the present invention;
fig. 2 is a schematic optical path diagram of an optical system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pupil provided in an embodiment of the present invention;
FIG. 4 is a MTF curve provided by an embodiment of the present invention;
FIG. 5 is a distortion curve for optical imaging according to an embodiment of the present invention;
FIG. 6 illustrates a field curvature provided by an embodiment of the present invention;
FIG. 7a is a diagram of a structure of 0 degree myopia and MTF curves according to an embodiment of the present invention;
FIG. 7b is a diagram of a 400 degree myopia structure and MTF curves according to an embodiment of the present invention;
FIG. 7c is a block diagram and MTF curves for 700 degrees of myopia according to an embodiment of the present invention;
FIG. 8a is a block diagram and MTF graph of another 0 degree myopia according to the present invention;
FIG. 8b is a block diagram and MTF curves for another 400 degrees myopia configuration according to an embodiment of the present invention;
FIG. 8c is a block diagram and MTF curves for another 700 degrees myopia according to an embodiment of the present invention;
FIG. 9a is a schematic diagram of a 0 degree myopia structure and an MTF graph according to an embodiment of the present invention;
FIG. 9b is a block diagram and MTF curves for another 400 degrees myopia according to the present invention;
FIG. 9c is a block diagram and MTF curves for another 700 degrees of myopia according to an embodiment of the present invention;
fig. 10 is a dot-sequence diagram according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
VR technology is an important direction of simulation technology, and is a collection of simulation technology and many technologies such as computer graphics, man-machine interface technology, multimedia technology, sensing technology, network technology, etc. Is a challenging cross-technology frontier subject and research field. VR technology mainly includes aspects such as simulated environment, perception, natural skills and sensing equipment. The simulated environment is a three-dimensional realistic image generated by a computer and dynamic in real time. Perception means that an ideal VR should have the perception that everyone has. In addition to the visual perception generated by computer graphics technology, there are also perceptions such as auditory sensation, tactile sensation, force sensation, and movement, and even olfactory sensation and taste sensation, which are also called multi-perception. The natural skill refers to the head rotation, eyes, gestures or other human body behavior actions of a human, and data adaptive to the actions of the participants are processed by the computer, respond to the input of the user in real time and are respectively fed back to the five sense organs of the user. The sensing device refers to a three-dimensional interaction device.
In view of this, an embodiment of the present invention provides an optical system, which can reduce the problem of ghost image generated by the optical system in the prior art.
Fig. 1 is a schematic structural diagram of an optical system according to an embodiment of the present invention. The optical system 100 includes a display screen 101, a first polarization component 102, a first lens 103, a second lens 104, and a second polarization component 105. The display screen 101 is configured to emit first light, the first polarization assembly 102 is configured to convert the first light into first circularly polarized light and transmit the first circularly polarized light to the first lens 103, the first lens 103 is configured to transmit the first circularly polarized light to the second lens 104, the second lens 104 is configured to transmit the first circularly polarized light to the second polarization assembly 105, the second polarization assembly 105 is configured to convert the first circularly polarized light into second circularly polarized light and transmit the second circularly polarized light to the second lens 104, the second lens 104 is further configured to transmit the second circularly polarized light to the first lens 103, and the first lens 103 is further configured to reflect the second circularly polarized light to the second polarization assembly 105; the second polarizing component 105 is also used to convert the second circular polarized light into a first line polarized light, which is used to form an image on the human eye.
By providing the first lens as a plastic lens, correction of aberration of the optical system can be achieved. By providing the second lens as a glass lens, the problem of ghost due to stress birefringence of the plastic material can be reduced. By combining the first and second polarizing components, a reduction of stray light of the optical system may be achieved.
In the embodiment of the present invention, the equivalent focal length range of the optical system is [21mm, 25mm ], and for convenience of description, the linear polarization in which the transmission axis direction is vertical is referred to as a first linear polarization, and the linear polarization in which the transmission axis is transverse is referred to as a second linear polarization. The optical system comprises a display screen, a first polarization assembly, a first lens, a second polarization assembly and a second polarization absorption film, wherein the first polarization assembly comprises a first polarization absorption film and a first quarter-wave plate, and the second polarization assembly comprises a second quarter-wave plate and a polarization reflection film. The respective components in the optical system are described below.
In an embodiment of the invention, the optical system comprises a display screen, wherein the display screen is operative to emit image light onto the first polarizing absorption film.
In an embodiment of the present invention, the optical system includes a first polarization absorbing film, wherein the first polarization absorbing film functions to project linearly polarized light corresponding to a polarization direction of the first polarization absorbing film and to absorb light of other polarization types.
In an embodiment of the present invention, the optical system includes a first quarter-wave plate, wherein the first quarter-wave plate is used for converting the polarization state of the light. The first quarter wave plate can convert linear polarization into circular polarization and can also convert the circular polarization into linear polarization.
The optical system comprises a first lens, wherein the first lens is a plastic lens, and the shape of the first lens is a meniscus lens. The surface of the first lens close to the first polarizing component is plated with a first antireflection film, the surface of the first lens close to the second lens is plated with a semi-transparent and semi-reflective film, the first transmittance of the first transmission film is larger than a first threshold value, the second transmittance of the semi-transparent and semi-reflective film ranges from [ 30% to 70% ], and the first reflectance of the semi-transparent and semi-reflective film ranges from [ 30% to 70% ]. The first antireflection film has the function of reducing ghost images caused by reflection of the first lens and reducing stray light caused by reflection of the first lens, and the surface, close to the second lens, of the first lens is plated with the semi-transparent and semi-reflective film which has the function of folding a light path, so that the total length of the optical system can be reduced to a greater extent, the whole optical system is light and thin, and user experience is improved. The first focal length range of the first lens is [21mm, 50mm ]. Wherein the first focal length of the first lens may be 33.33 mm.
The optical system comprises a second lens, wherein the second lens is a glass lens, and the shape of the second lens is a plano-convex lens. And a second antireflection film is plated on the surface of the second lens close to the first lens, and the third transmittance of the second antireflection film is greater than the first threshold value. First, theThe two antireflection films can reduce the ghost image problem caused by the reflection of the second lens and reduce the stray light caused by the reflection of the second lens. The second focal length range of the second lens is [105mm, 250mm ]]. Wherein the second focal length of the second lens may be 178.532 mm. Through the combination of the first lens and the second lens, the second lens bears most of focal power, and the first lens bears part of focal power, so that the problems of ghost and stray light in an optical system can be solved, and aberrations such as spherical aberration, chromatic aberration and coma can be effectively eliminated. If the equivalent focal length of the optical system is F, the first focal length of the first lens is F 1 The second focal length of the second lens is f 2 . Wherein, f 1 The formula one is satisfied:
F≦|f 1 | ≦ 2F equation one
Wherein f is 2 The formula II is satisfied:
5F≦|f 2 | ≦ 10F equation two
In an embodiment of the invention, the optical system comprises a second quarter-wave plate, wherein the second quarter-wave plate is used for converting the polarization state of the light. The second quarter-wave plate can convert linear polarization into circular polarization and can also convert the circular polarization into linear polarization. The direction of the optical axis of the first quarter-wave plate is consistent with the direction of the optical axis of the second quarter-wave plate. Thereby less stray light may be achieved into the human eye. In an embodiment of the present invention, the optical system includes a second polarization absorbing film, wherein the second polarization absorbing film is configured to project linearly polarized light corresponding to a polarization direction of the second polarization absorbing film to a human eye to form an image, and absorb light of other polarization types.
In an embodiment of the present invention, the optical system includes a polarizing reflective film, wherein the polarizing reflective film functions to selectively transmit linearly polarized light, wherein the polarizing reflective film transmits the first linearly polarized light and reflects the second linearly polarized light.
Fig. 2 is a schematic diagram of an optical path of an optical system according to an embodiment of the present invention. For example, if the first light emitted from the display screen is natural light, the natural light is transmitted to the first polarization absorption film, wherein the first polarization absorption film transmits a first line of polarized light in the natural light, absorbs a second line of polarized light in the natural light, and transmits the first line of polarized light to the first quarter-wave plate, wherein a direction of a transmission axis of the first line of polarized light is a vertical direction, and a direction of a transmission axis of the second line of polarized light is a horizontal direction. The first quarter-wave plate converts the first linear polarized light into first circular polarized light, wherein in order to more accurately convert the first linear polarized light into the first circular polarized light, an included angle between a direction of a transmission axis of the first polarization absorption film and a direction of an optical axis of the first quarter-wave plate needs to be determined to be 45 ° ± 0.5 °. For example, an angle between a direction of a transmission axis of the first polarization absorption film and a direction of an optical axis of the first quarter-wave plate is 45 °, and transmits first circularly polarized light to the first lens, wherein the first circularly polarized light may be left-handed circularly polarized light. The first lens transmits the first circular polarized light to the second lens, the second lens transmits the first circular polarized light to the second quarter-wave plate, and the second quarter-wave plate converts the first circular polarized light into second linear polarized light and transmits the second linear polarized light to the polarization reflection film. The first quarter wave plate is used for transmitting the first linear polarized light, the second quarter wave plate is used for converting the second linear polarized light into second circular polarized light and transmitting the second circular polarized light to the second lens, the second lens is used for transmitting the second circular polarized light to the first lens, and the surface of the first lens close to the second lens is plated with the semi-transparent semi-reflective film, so that the second circular polarized light does not need to be transmitted to the first lens, but the semi-transparent semi-reflective film of the first lens close to the second lens is used for reflecting the second circular polarized light to the second lens, then the second lens is used for transmitting the second circular polarized light to the second quarter wave plate, and then the second quarter wave plate is used for converting the second circular polarized light into the first linear polarized light and transmitting the first linear polarized light to the polarization reflecting film. The polarizing reflective film transmits the first linearly polarized light to the second polarizing absorbent film, and then the second polarizing absorbent film transmits the first linearly polarized light to the human eye to form an image. And the direction of the light transmission axis of the first polarization absorption film is consistent with that of the light transmission axis of the second polarization absorption film. The direction of the transmission axis of the polarization reflection film is consistent with the direction of the transmission axis of the second polarization absorption film. In this case, if part of the second linearly polarized light reaches the second polarization absorbing film due to the performance of the polarization reflecting film, the vibration direction of the second linearly polarized light is perpendicular to the light transmission axis direction of the second polarization absorbing film, and the second linearly polarized light is absorbed by the second polarization absorbing film, so that stray light due to the polarization reflecting film is removed.
The first lens is coated with the first antireflection film, the second lens is coated with the second antireflection film, the first lens is made of plastic, the second lens is made of glass, the ghost image problem caused by plastic stress birefringence in the optical system can be solved, the second polarization absorption film is arranged on the polarization reflection film, the stray light transmitted to the second polarization absorption film by the polarization reflection film can be absorbed, and the stray light in the optical system can be absorbed and reduced. Through adopting syllogic light path folding, great degree has reduced optical system's overall length to realize making optical system whole lighter and thinner.
In the embodiment of the present invention, as shown in fig. 3, a schematic structural diagram of a pupil provided in the embodiment of the present invention is shown. By determining the entrance pupil distance range of the optical system to be [13mm, 20mm ], user comfort in use can be improved.
In the embodiment of the invention, the semi-transparent and semi-reflective film can be plated on the first lens in a film plating mode, the first anti-reflection film is plated on the first lens, the second anti-reflection film is plated on the right surface of the second lens, and the first quarter-wave plate, the second quarter-wave plate, the first polarization absorption film, the second polarization absorption film and the polarization reflection film can be attached to the corresponding components in the optical system in an optical glue mode, wherein the first quarter-wave plate and the first polarization absorption film are attached to the display screen through the optical glue. The difference value between the refractive index of the first glue corresponding to the optical glue and the refractive index of the first polarization absorption film needs to be smaller than a second threshold, so that the ghost problem caused by reflection of the optical system can be reduced. The second threshold may be preset, or may be determined according to specific situations, and is not limited herein. The second quarter-wave plate, the second polarization absorption film and the polarization reflection film are adhered to the left surface of the second lens through optical glue, and the difference value between the refractive index of the second glue corresponding to the optical glue and the refractive index of the second lens is required to be smaller than a second threshold value, so that the ghost problem caused by reflection of the optical system can be reduced.
Example one
As can be seen from table 1, according to the first focal length of the first lens being 33.33mm and the second focal length of the second lens being 178.532mm, the equivalent focal length of the optical system can be determined to be 23.33mm, and the field angle of 90 °, and by designing the diameter of the entrance pupil disposed at the optical system to be 4 while adopting the pupil offset design, the range of eyebox with the diameter of 10mm is realized, and accordingly, a larger eye movement range can be obtained.
Meanwhile, the size of the display screen is designed to be 2.1 inches, the eye distance is 15mm, and the MTF graph in fig. 4 is combined to obtain the abscissa (spatial frequency per millimeter) value of which the average ordinate (modulation transfer function) of the field of view is higher than 0.18, so that the resolution of 1600 x 1600 which can be supported by the visual angle resolving power of the optical system is obtained.
Further, as can be seen from FIG. 5, the distortion rate of the optical imaging in the embodiment of the present invention is controlled in the range of (-19.2%, 0), and the field curvature in FIG. 6 is controlled in the range of (-2mm, 2 mm). From the parameter information in table 1, the nyquist frequency can be calculated. Specifically, the half-image height of a 2.1 inch screen is approximately 19.2mm, the pixel size is 19.2 × 2 × 1000/1600 ═ 24um, and the nyquist frequency is 1000/(2 × 24) ═ 21 lp/mm.
TABLE 1 index parameter Table
Example two
Table 2 it can be seen that the first row represents the 0 object plane, which refers to the virtual image plane, and the thickness-1500 mm indicates that the virtual image is placed at 1.5 m. The second row represents a diaphragm, actually referred to as an eye, the aperture is 2mm, the diameter of the entrance pupil is 4mm, the third row represents a second polarizing absorption film, the fourth to fifth rows represent second polarizing components, the sixth and seventh rows represent the relevant parameter design of the second lens, the radius of curvature represents the radius of curvature of the second lens, the eighteenth and nineteenth rows represent the relevant parameter design of the first lens, wherein the serial numbers 16 and 17 are plastic lens surfaces, the surface type is an even aspheric surface, and the expression of the even aspheric surface is formula three:
in the third formula, c is the curvature of the vertex of the curved surface, r is the distance between the point of the lens and the optical axis, k is a cone coefficient, d, e, f and the like are high-order term coefficients, and x is the rise. For other related parameter explanations in this embodiment, reference may be made to embodiment one, which is not described herein.
TABLE 2 design parameters Table
EXAMPLE III
As can be seen from table 3, the coefficients corresponding to the aspheric surface having surface number 7 in table 2 are respectively conic coefficient of 0.261, coefficient of-2.024E-06 for 4 th order, coefficient of 2.716E-08 for 6 th order, coefficient of-1.499E-10 for 8 th order, coefficient of 5.715E-13 for 10 th order, coefficient of-8.557E-16 for 12 th order, coefficient of 8.021E-19 for 14 th order, and coefficient of-3.124E-22 for 16 th order. The coefficients of the aspheric surface with surface number 16 are respectively conic coefficient of 0.261, coefficient of order 4 of-2.024E-06, coefficient of order 6 of 2.716E-08, coefficient of order 8 of-1.499E-10, coefficient of order 10 of 5.715E-13, coefficient of order 12 of-8.557E-16, coefficient of order 14 of 8.021E-19, and coefficient of order 16 of-3.124E-22. The coefficients of the aspheric surface with the surface number of 17 are respectively a conic coefficient of-3.247, a 4 th order coefficient of 5.224E-05, a 6 th order coefficient of-6.455E-08, an 8 th order coefficient of-3.706E-10, a 10 th order coefficient of 1.207E-12, a 12 th order coefficient of-7.526E-16, a 14 th order coefficient of-1.223E-18 and a 16 th order coefficient of 1.350E-21.
TABLE 3 TABLE OF COEFFICIENCY OF ASHELIC SURFACES IN THE FIRST LENS
| Surface number | Coefficient of cone | Coefficient of order 4 | Coefficient of order 6 | Coefficient of order 8 | Coefficient of order 10 | Coefficient of order 12 | Coefficient of order 14 | Coefficient of order 16 |
| 7 | 0.261 | -2.024E-06 | 2.716E-08 | -1.499E-10 | 5.715E-13 | -8.557E-16 | 8.021E-19 | -3.124E-22 |
| 16 | 0.261 | -2.024E-06 | 2.716E-08 | -1.499E-10 | 5.715E-13 | -8.557E-16 | 8.021E-19 | -3.124E-22 |
| 17 | -3.247 | 5.224E-05 | -6.455E-08 | -3.706E-10 | 1.207E-12 | -7.526E-16 | -1.223E-18 | 1.350E-21 |
In the embodiment of the invention, in order to deal with the use of the optical system for the myopia people, the adjustment of the visibility is designed, and three methods for adjusting the visibility are provided.
The first approach is to achieve 0 degree myopia to 700 degree myopia adjustment by adjusting the position of the second lens in the optical system. Fig. 7a shows a structure diagram of 0 degree myopia and MTF curves according to an embodiment of the present invention. As shown in fig. 7b, a chart showing the structure of 400 degrees of myopia and MTF curves provided in the embodiment of the present invention are shown. Fig. 7c shows a structure diagram and MTF curves for 700 degrees of myopia according to an embodiment of the present invention. As can be seen from fig. 7a to 7c, by adjusting the position of the second lens in the optical system, the user can see the image formed by the optical system in the human eye clearly in the optical system from 0 degree myopia to 700 degree myopia.
A second approach is to achieve 0 degree myopia to 700 degree myopia adjustment by adjusting the position of the first lens in the system. Fig. 8a shows another structure diagram of 0 degree myopia and MTF curves according to the embodiment of the present invention. Fig. 8b shows another structure diagram of myopia 400 degrees and MTF curves according to the embodiment of the present invention. Fig. 8c shows another structure diagram of 700 degrees of myopia and MTF curves according to the embodiment of the present invention. As can be seen from fig. 8a to 8c, the position of the first lens in the optical system is adjusted so as to enable the user to see the image formed by the optical system in the human eye clearly in the optical system from 0 degree myopia to 700 degrees myopia.
The third method is that the distance between the combination of the first lens and the second lens and the screen is adjusted by fixing the display screen, adjusting the distance between the combination of the first lens and the second lens and the screen or fixing the position of the combination of the first lens and the second lens, and the distance between the screen and the combination of the first lens and the second lens can be adjusted from 0-degree myopia to 700-degree myopia. Fig. 9a shows a structure diagram and MTF curves for a further 0 degree myopia according to the embodiment of the present invention. Fig. 9b shows a structure diagram and MTF curves of a further 400 degrees myopia according to the embodiment of the present invention. Fig. 9c shows a structure diagram and MTF curves of 700 degrees myopia according to another embodiment of the present invention. As can be seen from fig. 9a to 9c, the distance from the screen to the combination of the first lens and the second lens is adjusted by adjusting the distance from the combination of the first lens and the second lens to the screen or fixing the position of the combination of the first lens and the second lens, so that the myopia can be realized at 0 degree to 700 degrees, and the image formed by the optical system on the human eye can be seen clearly by the user in the optical system.
Fig. 10 is a schematic diagram of a dot array according to an embodiment of the present invention. The optical system in the embodiment of the invention has better imaging quality because the value of the diffuse spot in the dot-column diagram in the graphic table is smaller.
Claims (14)
1. An optical system, comprising: the display screen, the first polarization component, the first lens, the second lens and the second polarization component; the first lens is a plastic lens; the second lens is a glass lens;
the display screen is used for transmitting a first light ray to the first polarization component;
the first polarization component is used for converting the first light into first circularly polarized light and transmitting the first circularly polarized light to the first lens;
the first lens is used for transmitting the first circular polarization light to the second lens;
the second lens is used for transmitting the first circular polarization light to the second polarization component;
the second polarization assembly is used for converting the first circular polarization into second circular polarization and transmitting the second circular polarization to the second lens;
the second lens is further for transmitting the second circularly polarized light to the first lens;
the first lens is further configured to reflect the second circularly polarized light to the second polarizing component;
the second polarizing component is further configured to convert the second circularly polarized light to a first linearly polarized light, the first linearly polarized light being configured to form an image on a human eye.
2. The system of claim 1, wherein the first polarizing component comprises a first polarizing absorbing film, a first quarter wave plate;
the first polarization absorption film is used for transmitting first linear vibration light in the first light rays and absorbing second linear vibration light in the first light rays;
the first quarter-wave plate is used for converting the first linearly polarized light into first circularly polarized light and transmitting the first circularly polarized light to the first lens.
3. The system of claim 1, wherein the optical system further comprises a second polarizing absorbing film;
the second polarized absorption film is used for transmitting the first linear polarized light to human eyes to form images.
4. The system of claim 1, wherein the second polarization component comprises a second quarter wave plate and a polarizing reflective film;
the second quarter-wave plate is used for converting the first circular polarized light into second linear polarized light and transmitting the second linear polarized light to the polarization reflecting film;
the polarization reflection film is used for reflecting the second linearly polarized light to the second quarter-wave plate;
the second quarter-wave plate is further used for converting the second linear polarization into second circular polarization and transmitting the second circular polarization to the second lens and the first lens;
the second quarter wave plate is also used for converting the second circular polarization into a first linear polarization;
the polarizing reflective film is also configured to transmit the first linearly polarized light to the second polarizing absorbing film.
5. The system of claim 1, wherein a surface of the first lens proximate to the first polarizing component is coated with a first anti-reflection film, a surface of the first lens proximate to the second lens is coated with a semi-transparent and semi-reflective film, a first transmittance of the first anti-reflection film is greater than a first threshold, a second transmittance of the semi-transparent and semi-reflective film is in a range of [ 30%, 70% ], and a first reflectance of the semi-transparent and semi-reflective film is in a range of [ 30%, 70% ].
6. The system of claim 1, wherein a surface of the second lens proximate to the first lens is coated with a second anti-reflective coating, the second anti-reflective coating having a third transmittance that is greater than the first threshold.
7. The system of claim 1, wherein the direction of the transmission axis of the first polarizing absorber film is at an angle in the range of 45 ° ± 0.5 ° to the direction of the optical axis of the first quarter-wave plate.
8. The system of claim 1, wherein the orientation of the transmission axis of the polarizing reflective film is coincident with the orientation of the transmission axis of the second polarizing absorbing film.
9. The system of claim 1, wherein the direction of the transmission axis of the first polarizing absorber film is coincident with the direction of the transmission axis of the second polarizing absorber film.
10. The system of claim 1, wherein the direction of the optical axis of the first quarter wave plate coincides with the direction of the optical axis of the second quarter wave plate.
11. The system of claim 1, wherein the optical system has an entrance pupil distance in a range of [13mm, 20mm ].
12. The system of claim 1, wherein the equivalent focal length F of the optical system is in the range [21mm, 25mm ].
13. The system of claim 12, wherein the first focal length f of the first lens is 1 The relationship between the range of (a) and the equivalent focal length F of the optical system is:
F≦|f 1 |≦2F。
14. the system of claim 12, wherein the second focal length f of the second lens 2 The relationship between the range of (a) and the equivalent focal length of the optical system is:
5F≦|f 2 |≦10F。
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652460A (en) * | 2016-03-21 | 2016-06-08 | 深圳多哚新技术有限责任公司 | Short distance optical amplification module, spectacles, helmet and VR system |
| CN205562978U (en) * | 2016-03-21 | 2016-09-07 | 深圳多哚新技术有限责任公司 | Short distance optical enlargement module, glasses, helmet and VR system |
| US20170017078A1 (en) * | 2015-07-13 | 2017-01-19 | Shenzhen Dlodlo Technologies Co., Ltd. | Short-distance optical amplification module and near-eye display optical module using the same |
| CN109946837A (en) * | 2018-08-31 | 2019-06-28 | 华为技术有限公司 | A kind of optical imaging system |
| CN110161699A (en) * | 2019-06-14 | 2019-08-23 | 上海视涯信息科技有限公司 | A kind of virtual reality display equipment |
| EP3531183A1 (en) * | 2018-02-26 | 2019-08-28 | Seiko Epson Corporation | Virtual image display device |
| WO2020014992A1 (en) * | 2018-07-16 | 2020-01-23 | 上海视欧光电科技有限公司 | Virtual reality display apparatus |
| CN111766705A (en) * | 2020-06-19 | 2020-10-13 | 江西微瑞光学有限公司 | Short-distance and high-lens-birefringence-tolerance optical imaging module |
| CN111766702A (en) * | 2020-06-29 | 2020-10-13 | 京东方科技集团股份有限公司 | Near-to-eye display optical system for eyeball tracking |
| CN214474230U (en) * | 2020-12-24 | 2021-10-22 | 联想(北京)有限公司 | Optical system and head-mounted display device |
| WO2021218474A1 (en) * | 2020-04-30 | 2021-11-04 | 京东方科技集团股份有限公司 | Optical display system, control method, and display device |
| CN114509876A (en) * | 2022-03-18 | 2022-05-17 | 广州立景创新科技有限公司 | Display module and method of manufacturing the same |
| CN114706228A (en) * | 2022-06-07 | 2022-07-05 | 沂普光电(天津)有限公司 | Optical system and VR equipment |
-
2022
- 2022-07-19 CN CN202210850884.4A patent/CN115128824A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170017078A1 (en) * | 2015-07-13 | 2017-01-19 | Shenzhen Dlodlo Technologies Co., Ltd. | Short-distance optical amplification module and near-eye display optical module using the same |
| CN205562978U (en) * | 2016-03-21 | 2016-09-07 | 深圳多哚新技术有限责任公司 | Short distance optical enlargement module, glasses, helmet and VR system |
| CN105652460A (en) * | 2016-03-21 | 2016-06-08 | 深圳多哚新技术有限责任公司 | Short distance optical amplification module, spectacles, helmet and VR system |
| EP3531183A1 (en) * | 2018-02-26 | 2019-08-28 | Seiko Epson Corporation | Virtual image display device |
| WO2020014992A1 (en) * | 2018-07-16 | 2020-01-23 | 上海视欧光电科技有限公司 | Virtual reality display apparatus |
| CN109946837A (en) * | 2018-08-31 | 2019-06-28 | 华为技术有限公司 | A kind of optical imaging system |
| CN110161699A (en) * | 2019-06-14 | 2019-08-23 | 上海视涯信息科技有限公司 | A kind of virtual reality display equipment |
| WO2020248329A1 (en) * | 2019-06-14 | 2020-12-17 | 上海视涯信息科技有限公司 | Virtual reality display device |
| WO2021218474A1 (en) * | 2020-04-30 | 2021-11-04 | 京东方科技集团股份有限公司 | Optical display system, control method, and display device |
| CN111766705A (en) * | 2020-06-19 | 2020-10-13 | 江西微瑞光学有限公司 | Short-distance and high-lens-birefringence-tolerance optical imaging module |
| CN111766702A (en) * | 2020-06-29 | 2020-10-13 | 京东方科技集团股份有限公司 | Near-to-eye display optical system for eyeball tracking |
| CN214474230U (en) * | 2020-12-24 | 2021-10-22 | 联想(北京)有限公司 | Optical system and head-mounted display device |
| CN114509876A (en) * | 2022-03-18 | 2022-05-17 | 广州立景创新科技有限公司 | Display module and method of manufacturing the same |
| CN114706228A (en) * | 2022-06-07 | 2022-07-05 | 沂普光电(天津)有限公司 | Optical system and VR equipment |
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