CN209858857U - Optical system and virtual reality equipment with same - Google Patents
Optical system and virtual reality equipment with same Download PDFInfo
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- CN209858857U CN209858857U CN201920893068.5U CN201920893068U CN209858857U CN 209858857 U CN209858857 U CN 209858857U CN 201920893068 U CN201920893068 U CN 201920893068U CN 209858857 U CN209858857 U CN 209858857U
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Abstract
The utility model discloses an optical system and have its virtual reality equipment, optical system include along the display element, beam splitter, first lens, second lens, first phase delay ware, polarizing reflector and the diaphragm that the optical axis direction set gradually, first lens includes first surface and second surface; the second lens comprises a third surface and a fourth surface; the second lens is a Fresnel lens, and the distance from the display unit to the center of the fourth surface is less than or equal to 22 mm; the incident light emitted by the display unit is reflected by the polarization reflector, the reflected incident light sequentially passes through the second lens and the first lens and then is reflected by the light splitter, and the reflected incident light is transmitted to the diaphragm. The utility model provides an optical system and have its virtual reality equipment has solved among the prior art because the optical system volume is great, and the volume that leads to virtual reality equipment is great, the problem that the comfort level that the user wore is low.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to an optical system and have its virtual reality equipment.
Background
With the development of virtual reality technology, the form and the variety of virtual reality equipment are increasingly diversified, and the application field is increasingly wide, present virtual reality equipment, after passing through optical system's transmission and enlargeing with the display screen in the equipment usually, transmit the image of output to people's eye, consequently people's eye receives is the virtual image of display screen after enlargeing, thereby realize the purpose of big screen viewing through virtual reality equipment, and in order to realize the enlargeing of image, optical system needs the mode of a plurality of lens combinations to realize usually, because the volume is great when a plurality of lens combinations use, and then lead to the volume of virtual reality equipment great, the comfort level that the user wore has been reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides an optical system and have its virtual reality equipment aims at solving among the prior art because the optical system volume is great, leads to the volume of virtual reality equipment great, the problem that the comfort level that the user wore is low.
To achieve the above object, the present invention provides an optical system including a display unit, a beam splitter, a first lens, a second lens, a first phase retarder, a polarizing reflector, and a diaphragm arranged in this order along an optical axis,
the first lens comprises a first surface close to one side of the display unit and a second surface far away from one side of the display unit; the first lens is a flat lens;
the second lens comprises a third surface close to one side of the first lens and a fourth surface far from one side of the first lens;
the second lens is a Fresnel lens, and the third surface comprises a plurality of zigzag concentric rings which are sequentially connected;
a distance from the display unit to a center of the fourth surface is less than or equal to 22 mm;
the incident light that the display element sent is in proper order after passing through beam splitter, first lens, second lens and first phase delay ware polarization reflector takes place to reflect, is reflected incident light again in proper order after passing through the second lens the first lens the beam splitter takes place to reflect, is reflected again incident light pass through in proper order behind the first lens the second lens first phase delay ware and the polarization reflector, transmit extremely the diaphragm.
Optionally, the incident light sequentially passes through the beam splitter, the first lens, the second lens and the first phase retarder and then is changed into a first linearly polarized light, and the incident light is reflected by the beam splitter and then sequentially passes through the first lens, the second lens and the first phase retarder again and then is changed into a second linearly polarized light;
the polarization direction of the first linearly polarized light is the same as the reflection direction of the polarization reflector, and the polarization direction of the second linearly polarized light is the same as the transmission direction of the polarization reflector.
Optionally, the first phase retarder is an 1/4 wave plate.
Optionally, the optical system satisfies the following relationship: ABS (R1) is more than or equal to 50mm and less than or equal to 80 mm; ABS (R2) is more than or equal to 100mm and less than or equal to 150 mm;
wherein the R1 is a radius of curvature of the third surface and the R2 is a radius of curvature of the fourth surface.
Optionally, the optical system satisfies the following relationship: t1 is more than or equal to 15mm and less than or equal to 22 mm; t2 is more than or equal to 12.5mm and less than or equal to 15 mm;
wherein the T1 is a distance from a center of the display unit to a center of the fourth surface, and the T2 is a distance from a center of the fourth surface to a center of the diaphragm.
Optionally, the optical system satisfies the following relationship: l1 is more than or equal to 4mm and less than or equal to 8 mm; l2 is more than or equal to 5mm and less than or equal to 10 mm; l3 is more than or equal to 1mm and less than or equal to 3 mm; l4 is more than or equal to 3mm and less than or equal to 8 mm;
wherein the L1 is a distance from a center of the display unit to a center of the first surface, the L2 is a center thickness of the first lens; the L3 is a distance from a center of the second surface to a center of the third surface, the L4 is a center thickness of the second lens.
Optionally, the optical system satisfies the following relationship: L1/T1 is more than or equal to 0.2 and less than or equal to 0.3; L2/T1 is more than or equal to 0.02 and less than or equal to 0.1; L3/T1 is more than or equal to 0.3 and less than or equal to 0.5; L4/T1 is more than or equal to 0.3 and less than or equal to 0.6;
wherein the L1 is a distance from a center of the display unit to a center of the first surface, the L2 is a center thickness of the first lens; the L3 is the distance from the center of the second surface to the center of the third surface, the L4 is the center thickness of the second lens; the T1 is a distance from a center of the display unit to a center of the fourth surface.
Optionally, the optical system satisfies the following relationship: f is not less than 3 x f2 and not more than 5 x f 2; f/T1 is more than or equal to 1 and less than or equal to 1.5;
wherein f is an overall focal length of the optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, and T1 is a distance from a center of the display unit to a center of the fourth surface.
Optionally, the optical system further comprises a second phase retarder disposed between the display unit and the first lens.
To achieve the above object, the present application provides a virtual reality device, which is characterized in that the virtual reality device includes an optical system according to any one of the above embodiments.
In the technical scheme that this application provided, optical system includes along optical axis direction display element, beam splitter, first lens, second lens, first phase delay ware, polarizing reflector and the diaphragm that sets gradually, the incident light that display element sent passes through in proper order the beam splitter first lens second lens and become first linearly polarized light behind the first phase delay ware, first linearly polarized light passes through during the polarizing reflector, because the reflection direction of polarizing reflector with the polarization direction of first linearly polarized light is the same, first linearly polarized light is in polarizing reflector takes place the reflection, first linearly polarized light passes through again behind the first phase delay ware, first linearly polarized light becomes first circularly polarized light, first circularly polarized light is in beam splitter takes place the reflection, first circularly polarized light becomes second circularly polarized light, the second circularly polarized light has opposite rotation property to the first circularly polarized light, and is changed into second linearly polarized light after passing through the first phase retarder, and the polarization direction of the second linearly polarized light is perpendicular to the polarization direction of the first linearly polarized light and is the same as the transmission direction of the polarization reflection film, so that the second linearly polarized light is transmitted to the diaphragm from the polarization reflector when being transmitted to the polarization reflector. Incident light takes place twice reflection between first lens with the second lens, has increased through the mode of reflection incident light is in optical system's optical path has reduced optical system's volume, and then reduces virtual reality equipment's volume solves among the prior art because optical system is bulky, leads to virtual reality equipment's volume great, and the comfort level that the user wore is low problem.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic optical path diagram of an embodiment of an optical system of the present invention;
fig. 2 is a schematic optical path diagram of another embodiment of the optical system of the present invention;
fig. 3 is a dot-column diagram of the optical system of the present invention;
fig. 4 is a graph of field curvature and optical distortion of the optical system of the present invention;
fig. 5 is a vertical axis chromatic aberration diagram of the optical system of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Display unit | 31 | Third surface |
| 20 | First lens | 32 | The fourth surface |
| 21 | First surface | 40 | Diaphragm |
| 22 | Second surface | 50 | Second phase delay device |
| 30 | Second lens |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The utility model provides an optical system and have its virtual reality equipment.
Referring to fig. 1, the optical system includes a display unit 10, a beam splitter, a first lens 20, a second lens 30, a first phase retarder (not shown), a polarizing reflector (not shown), and a stop 40 sequentially arranged along an optical axis direction,
the first lens 20 includes a first surface 21 on a side close to the display unit 10 and a second surface 22 on a side far from the display unit 10; the first lens 20 is a flat lens;
the second lens 30 includes a third surface 31 on a side close to the first lens 20 and a fourth surface 32 on a side far from the first lens 20;
the second lens 30 is a fresnel lens, and the third surface 31 includes a plurality of zigzag concentric rings connected in sequence;
the distance of the display unit 10 to the center of the fourth surface 32 is less than or equal to 22 mm;
the incident light ray that display element 10 sent is in proper order after passing through beam splitter, first lens 20, second lens 30 and first phase delay ware polarization reflector takes place to reflect, and the reflected incident light ray is in proper order again after passing through second lens 30 first lens 20 the beam splitter takes place to reflect, and the reflected incident light ray is in proper order again after passing through first lens 20 second lens 30 first phase delay ware and polarization reflector, transmission extremely diaphragm 40.
In the technical scheme that this application provided, optical system includes along optical axis direction display element 10, beam splitter, first lens 20, second lens 30, first phase delay ware, polarizing reflector and the diaphragm 40 that sets gradually, the incident light that display element 10 sent passes through in proper order the beam splitter first lens 20, second lens 30 and become first linearly polarized light behind the first phase delay ware, first linearly polarized light is because polarizing reflector's direction of reflection is the same with the direction of polarization of first linearly polarized light, first linearly polarized light is in polarizing reflector takes place the reflection, first linearly polarized light passes through again behind the first phase delay ware, first linearly polarized light becomes first circularly polarized light, first circularly polarized light is in the reflection takes place for the beam splitter, the first circularly polarized light is changed into a second circularly polarized light, the rotation of the second circularly polarized light is opposite to that of the first circularly polarized light, the second circularly polarized light is changed into a second linearly polarized light after passing through the first phase retarder, the polarization direction of the second linearly polarized light is perpendicular to that of the first linearly polarized light, and the polarization direction of the second linearly polarized light is the same as the transmission direction of the polarization reflection film, so that the second linearly polarized light is transmitted from the polarization reflector to the diaphragm 40 when being transmitted to the polarization reflector. The incident light is reflected twice between the first lens 20 and the second lens 30, and the optical path of the incident light in the optical system is increased in a reflection mode, so that the volume of the optical system is reduced, the volume of the virtual reality equipment is further reduced, and the problems that the volume of the virtual reality equipment is large and the wearing comfort of a user is low due to the fact that the volume of the optical system is large in the prior art are solved.
In some optional embodiments, the optical splitter is a splitting film or a splitting sheet, and when the optical splitter is the splitting film, the splitting film may be disposed on the first surface 21 by a plating or attaching method, and similarly, the polarization reflection film may be disposed on the fourth surface 32 by a plating or attaching method, and further, the splitting film is a semi-reflective and semi-transmissive film, and a ratio of a transmittance to a reflectance of the semi-reflective and semi-transmissive film is 1:1, it is understood that a splitting ratio of the splitting film is not limited thereto, and in other embodiments, a ratio of a transmittance to a reflectance of the splitting film may be 4:6 or 3: 7.
Preferably, the first phase retarder is a first 1/4 wave plate, and the center wavelength of the first 1/4 wave plate is equal to the wavelength of the incident light.
In some optional embodiments, the reflection direction of the polarizing reflective film is the same as the polarization direction of the first linearly polarized light, and the transmission direction of the polarizing reflective film is the same as the polarization direction of the second linearly polarized light. Specifically, when the reflection direction of the polarization reflection film is different from the polarization direction of the first linearly polarized light, the first linearly polarized light is partially reflected by the transmission part when passing through the polarization reflection film, so that the transmission efficiency of the first linearly polarized light is reduced, and in addition, the transmission part of the first linearly polarized light and the transmission part of the second linearly polarized light are transmitted to the diaphragm 40, so that double images of images observed by a user can be caused, and the observation experience of the user is influenced. When the transmission direction of the polarization reflection film is different from that of the second linearly polarized light, the transmittance of the second linearly polarized light is reduced, so that the transmission efficiency of the incident light in the optical system is reduced.
In some alternative embodiments, the optical system satisfies the following relationship: ABS (R1) is more than or equal to 50mm and less than or equal to 80 mm; the R1 is a radius of curvature of the third surface 31. When the third surface 31 is an aspheric surface, the radius of curvature of the third surface 31 is the radius of curvature of the aspheric vertex.
In a preferred embodiment, when the third surface 31 is a fresnel lens, the size of the lens module can be effectively reduced, the lens distribution of the lens module is more compact, and the weight of the lens module is reduced.
In some alternative embodiments, the optical system satisfies the following relationship: ABS (R2) is more than or equal to 100mm and less than or equal to 150 mm; the R2 is the radius of curvature of the fourth surface 32. Wherein, when the fourth surface 32 is an aspheric surface, the radius of curvature of the fourth surface 32 is the radius of curvature of the aspheric vertex.
In some alternative embodiments, the perpendicular center line of the display unit 10, the optical axis of the first lens 20, the optical axis of the second lens 30, the optical axis of the first phase retarder, and the perpendicular center line of the stop 40 are collinear. The optical system satisfies the following relationship: t1 is more than or equal to 15mm and less than or equal to 22 mm; t2 is more than or equal to 12.5mm and less than or equal to 15 mm; the T1 is the distance from the center of the display unit 10 to the center of the fourth surface 32, and the T2 is the distance from the center of the fourth surface 32 to the center of the diaphragm 40.
In some alternative embodiments, the optical system satisfies the following relationship: l1 is more than or equal to 4mm and less than or equal to 8 mm; l2 is more than or equal to 5mm and less than or equal to 10 mm; l3 is more than or equal to 1mm and less than or equal to 3 mm; l4 is more than or equal to 3mm and less than or equal to 8 mm; the L1 is the distance from the center of the display unit 10 to the center of the first surface 21, the L2 is the center thickness of the first lens 20; the L3 is the distance from the center of the second surface 22 to the center of the third surface 31, and the L4 is the center thickness of the second lens 30.
In some alternative embodiments, the optical system satisfies the following relationship: L1/T1 is more than or equal to 0.2 and less than or equal to 0.3; L2/T1 is more than or equal to 0.02 and less than or equal to 0.1; L3/T1 is more than or equal to 0.3 and less than or equal to 0.5; L4/T1 is more than or equal to 0.3 and less than or equal to 0.6; the L1 is the distance from the center of the display unit 10 to the center of the first surface 21, the L2 is the center thickness of the first lens 20; the L3 is the distance from the center of the second surface 22 to the center of the third surface 31, the L4 is the center thickness of the second lens 30; the T1 is the distance from the center of the display unit 10 to the center of the fourth surface 32, and the T2 is the distance from the center of the fourth surface 32 to the center of the diaphragm 40.
In some alternative embodiments, the optical system satisfies the following relationship: f is not less than 3 x f2 and not more than 5 x f 2; f/T1 is more than or equal to 1 and less than or equal to 1.5; the f is an overall focal length of the optical system, the f1 is a focal length of the first lens 20, the f2 is a focal length of the second lens 30, and the T1 is a distance from a center of the display unit 10 to a center of the fourth surface 32.
Referring to fig. 2, in some optional embodiments, when the incident light emitted from the display unit 10 is linearly polarized light, the optical system further includes a second phase retarder 50, where the second phase retarder 50 is disposed between the display unit 10 and the first lens 20, and is configured to convert the incident light emitted from the display unit 10 from the linearly polarized light to the circularly polarized light. Preferably, the second phase retarder 50 is a second 1/4 wave plate, and the center wavelength of the second 1/4 wave plate is equal to the wavelength of the incident light.
In some alternative embodiments, the fourth surface 32 is aspheric. In a specific embodiment, compared with a spherical structure, the aspheric structure can effectively reduce spherical aberration and distortion of the optical system, thereby reducing the number of lenses in the optical system and reducing the size of the lenses.
In some alternative embodiments, the stop 40 is used to control the passage of light, adjust the light flux exiting the optical system, and reduce stray light interference caused by reflection from other lenses.
In the first embodiment, the optical system design data is as shown in table 1 below:
TABLE 1
In the first embodiment, the parameters are as follows:
ABS(R1)＝67.538mm，ABS(R2)＝141.603mm；
f2＝93.31mm，f＝27.98mm；
T2＝13.0mm，T1＝22.0mm；
L1＝6.045mm，L2＝1.499mm，L3＝9.274mm，L4＝5.184mm；
then L1/T1 equals 0.275, L2/T1 equals 0.068, L3/T1 equals 0.421, L4/T1 equals 0.236;
fourth surface 32 may be an even aspheric structure, where the even aspheric structure satisfies the following relationship:
y is the central height of the mirror surface, Z is the position of the aspheric surface structure with the height of Y along the optical axis direction, the surface vertex is taken as the displacement value of the reference distance from the optical axis, C is the vertex curvature radius of the aspheric surface, and K is the cone coefficient; α i represents an i-th aspheric coefficient.
In another embodiment, the fourth surface 32 may also be an odd aspheric structure, wherein the odd aspheric structure satisfies the following relationship:
y is the central height of the mirror surface, Z is the position of the aspheric surface structure with the height of Y along the optical axis direction, the surface vertex is taken as the displacement value of the reference distance from the optical axis, C is the vertex curvature radius of the aspheric surface, and K is the cone coefficient; β i represents the i-th aspheric coefficient.
Referring to fig. 3, fig. 3 is a schematic diagram of a first embodiment, in which a plurality of light beams emitted from a point are focused on the same point due to aberration, and a diffusion pattern is formed in a certain range for evaluating the image quality of the projection optical system. In the first embodiment, the maximum value of the image points in the dot column image corresponds to the maximum field of view, and the maximum value of the image points in the dot column image is less than 70 μm.
Referring to fig. 4, fig. 4 is a graph of field curvature and optical distortion of the first embodiment, where the field curvature is used to indicate the position change of the beam image point of different field points from the image plane, and the optical distortion is the vertical axis distance of the intersection point of the principal ray at the dominant wavelength of a certain field and the image plane from the ideal image point; in the first embodiment, the field curvature at both the tangential and sagittal planes is less than ± 2mm, and the maximum field curvature difference between the tangential and sagittal planes is less than 1mm, with the maximum distortion being < 28.6% at the maximum field of view.
Referring to fig. 5, fig. 5 is a vertical axis chromatic aberration diagram of the first embodiment, in which the vertical axis chromatic aberration is also called magnification chromatic aberration, mainly referring to a polychromatic main light of an object side, which is dispersed by a refraction system and becomes a plurality of light rays when being emitted from an image side, and a difference value between focal positions of hydrogen blue light and hydrogen red light on an image plane; in the first embodiment, the maximum dispersion of the optical system is the maximum position of the field of view of the optical system, the maximum chromatic aberration value of the optical system is less than 493 μm, and the requirements of users can be met by matching with later software correction.
In the first embodiment, the length of the fourth surface 3232 from the display unit 10 to the second lens 30 is 22mm, the maximum field angle is 100 degrees, and the spot size of the maximum field of view of the optical system is less than 70 μm, so as to ensure that clear imaging is possible, and on the premise that the viewing experience of a user is satisfied, the volume of the optical system is reduced by folding the optical path, so that the volume and weight of the virtual reality device are reduced, and the use experience of the user is improved.
The utility model discloses still provide a virtual reality equipment, virtual reality equipment includes such as above-mentioned arbitrary embodiment optical system, this optical system's concrete structure refers to above-mentioned embodiment, because this optical system has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. An optical system comprising a display unit, a beam splitter, a first lens, a second lens, a first phase retarder, a polarizing reflector, and a diaphragm arranged in this order in an optical axis direction,
the first lens comprises a first surface close to one side of the display unit and a second surface far away from one side of the display unit; the first lens is a flat lens;
the second lens comprises a third surface close to one side of the first lens and a fourth surface far from one side of the first lens;
the second lens is a Fresnel lens, and the third surface comprises a plurality of zigzag concentric rings which are sequentially connected;
a distance from the display unit to a center of the fourth surface is less than or equal to 22 mm;
the incident light that the display element sent is in proper order after passing through beam splitter, first lens, second lens and first phase delay ware polarization reflector takes place to reflect, is reflected incident light again in proper order after passing through the second lens the first lens the beam splitter takes place to reflect, is reflected again incident light pass through in proper order behind the first lens the second lens first phase delay ware and the polarization reflector, transmit extremely the diaphragm.
2. The optical system according to claim 1, wherein the incident light ray passes through the beam splitter, the first lens, the second lens, and the first phase retarder in this order and then becomes a first linearly polarized light, and the incident light ray after being reflected by the beam splitter passes through the first lens, the second lens, and the first phase retarder again in this order and then becomes a second linearly polarized light;
the polarization direction of the first linearly polarized light is the same as the reflection direction of the polarization reflector, and the polarization direction of the second linearly polarized light is the same as the transmission direction of the polarization reflector.
3. The optical system of any of claims 1 or 2, wherein the first phase retarder is an 1/4 wave plate.
4. The optical system of claim 1, wherein the optical system satisfies the relationship: ABS (R1) is more than or equal to 50mm and less than or equal to 80 mm; ABS (R2) is more than or equal to 100mm and less than or equal to 150 mm;
wherein the R1 is a radius of curvature of the third surface and the R2 is a radius of curvature of the fourth surface.
5. The optical system of claim 1, wherein the optical system satisfies the relationship: t1 is more than or equal to 15mm and less than or equal to 22 mm; t2 is more than or equal to 12.5mm and less than or equal to 15 mm;
wherein the T1 is a distance from a center of the display unit to a center of the fourth surface, and the T2 is a distance from a center of the fourth surface to a center of the diaphragm.
6. The optical system of claim 1, wherein the optical system satisfies the relationship: l1 is more than or equal to 4mm and less than or equal to 8 mm; l2 is more than or equal to 5mm and less than or equal to 10 mm; l3 is more than or equal to 1mm and less than or equal to 3 mm; l4 is more than or equal to 3mm and less than or equal to 8 mm;
wherein the L1 is a distance from a center of the display unit to a center of the first surface, the L2 is a center thickness of the first lens; the L3 is a distance from a center of the second surface to a center of the third surface, the L4 is a center thickness of the second lens.
7. The optical system of claim 1, wherein the optical system satisfies the relationship: L1/T1 is more than or equal to 0.2 and less than or equal to 0.3; L2/T1 is more than or equal to 0.02 and less than or equal to 0.1; L3/T1 is more than or equal to 0.3 and less than or equal to 0.5; L4/T1 is more than or equal to 0.3 and less than or equal to 0.6;
wherein the L1 is a distance from a center of the display unit to a center of the first surface, the L2 is a center thickness of the first lens; the L3 is the distance from the center of the second surface to the center of the third surface, the L4 is the center thickness of the second lens; the T1 is a distance from a center of the display unit to a center of the fourth surface.
8. The optical system of claim 1, wherein the optical system satisfies the relationship: f is not less than 3 x f2 and not more than 5 x f 2; f/T1 is more than or equal to 1 and less than or equal to 1.5;
wherein f is an overall focal length of the optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, and T1 is a distance from a center of the display unit to a center of the fourth surface.
9. The optical system of claim 1, further comprising a second phase retarder disposed between the display unit and the first lens.
10. A virtual reality device, characterized in that it comprises an optical system according to any one of claims 1-9.
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| CN114047633A (en) * | 2021-06-30 | 2022-02-15 | 歌尔光学科技有限公司 | Imaging module, assembling method of imaging module and head-mounted display device |
| CN114839767A (en) * | 2022-03-31 | 2022-08-02 | 歌尔光学科技有限公司 | Low-distortion optical imaging adjustment method and system and head-mounted display device |
| WO2024020796A1 (en) * | 2022-07-26 | 2024-02-01 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
| EP4206786A4 (en) * | 2020-12-21 | 2024-03-20 | Goertek Optical Tech Co Ltd | Imaging light path and head-mounted display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4206786A4 (en) * | 2020-12-21 | 2024-03-20 | Goertek Optical Tech Co Ltd | Imaging light path and head-mounted display device |
| CN114047633A (en) * | 2021-06-30 | 2022-02-15 | 歌尔光学科技有限公司 | Imaging module, assembling method of imaging module and head-mounted display device |
| CN114839767A (en) * | 2022-03-31 | 2022-08-02 | 歌尔光学科技有限公司 | Low-distortion optical imaging adjustment method and system and head-mounted display device |
| WO2024020796A1 (en) * | 2022-07-26 | 2024-02-01 | 歌尔光学科技有限公司 | Optical module and head-mounted display device |
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