CN115079408B - Optical system and VR equipment - Google Patents
Optical system and VR equipment Download PDFInfo
- Publication number
- CN115079408B CN115079408B CN202211015987.5A CN202211015987A CN115079408B CN 115079408 B CN115079408 B CN 115079408B CN 202211015987 A CN202211015987 A CN 202211015987A CN 115079408 B CN115079408 B CN 115079408B
- Authority
- CN
- China
- Prior art keywords
- optical system
- lens
- display unit
- denotes
- curvature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G02B27/0081—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. enlarging, the entrance or exit pupil
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses an optical system and VR equipment, wherein the optical system sequentially comprises a display unit, a first lens, a second lens, a composite film layer and a third lens along a light transmission direction; the first lens comprises a first surface facing the display unit and a second surface facing away from the display unit, and the second lens comprises a third surface facing the display unit and a fourth surface facing away from the display unit; the third lens comprises a fifth surface facing the display unit and a sixth surface facing away from the display unit; the first lens has positive focal power, the first surface is a convex surface, the first surface is provided with a partial reflector, and the second surface is a convex surface at a paraxial region; the second lens has negative focal power, the third surface is convex, and the fourth surface is concave at a paraxial region; the composite film layer sequentially comprises a phase delay sheet and a reflective polarizing sheet along the light transmission direction. The optical system has the advantages of large field angle, short total length and adjustable diopter.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an optical system and VR equipment.
Background
With the development of Virtual Reality (VR) technology, the forms and the types of virtual reality devices are increasingly diversified, and the application fields are increasingly wide. In order to achieve compact size and light weight while maintaining good optical characteristics, folded optical path technology has been used in recent years, and VR folded optical systems are gradually becoming the development direction of consumer-grade VR optics with light weight, excellent imaging quality, and a gradually mature mass production process.
In order to provide excellent sensory experience for users, VR devices need to have a large field angle, a long eye distance, a large eye movement range and high-quality imaging, and meanwhile, in order to meet users with different degrees of myopia, the VR devices also need to have diopter adjustability.
Disclosure of Invention
Therefore, the invention aims to provide an optical system and VR equipment, which have the advantages of large field angle, total length and diopter adjustability.
The embodiment of the invention implements the above object by the following technical scheme.
In one aspect, an embodiment of the present invention provides an optical system, which sequentially includes a display unit, a first lens, a second lens, a composite film layer, and a third lens along a light transmission direction;
the display unit is used for providing a polarized light source for the optical system;
the first lens comprises a first surface facing the display unit and a second surface facing away from the display unit, and the second lens comprises a third surface facing the display unit and a fourth surface facing away from the display unit; the third lens comprises a fifth surface facing the display unit and a sixth surface facing away from the display unit;
the first lens has positive optical power, the first surface is convex, and the first surface is provided with a partial reflector, the second surface is convex at a paraxial region;
the second lens has a negative optical power, the third surface is convex, and the fourth surface is concave at a paraxial region;
the composite film layer sequentially comprises a phase delay sheet and a reflective polarizing sheet along the light transmission direction;
the third lens has positive focal power, the fifth surface is a plane, and the sixth surface is a convex surface;
the composite film layer is disposed on the fifth surface; the first lens and the second lens can be dynamically moved on an optical axis as a whole, and the air separation distance between the composite film layer and the second lens on the optical axis is adjusted.
In another aspect, the present invention also provides a VR device comprising an optical system as described above.
According to the optical system and the VR equipment provided by the invention, three lenses with specific focal power are adopted, and the composite film layer is arranged between the second lens and the third lens, so that each lens realizes multiple turn-back of the optical path through specific surface shape collocation and film layer arrangement, the total length of the optical path is enlarged, the optical system has a larger field angle and a shorter total length, and the thinning of the VR equipment is facilitated; meanwhile, a larger field angle can provide a display effect of a wide field of view, and the immersion of the user is improved, so that better experience is brought to the user. Simultaneously through adjusting the whole position on the optical axis that comprises first, two lenses, can realize compound rete and the air interval's of second lens on the optical axis dynamic adjustment to realize diopter's regulation, simultaneously optical system still has great exit pupil distance, can bring splendid sense organ experience for the user.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical system provided by a first embodiment of the invention when diopter is 0 °;
FIG. 2 is a schematic diagram of an optical system with a diopter of 800 in accordance with the first embodiment of the present invention;
FIG. 3 is a schematic diagram of optical ray transmission in a VR device of an optical system according to a first embodiment of the present invention;
FIG. 4 is an astigmatism graph of an optical system provided by a first embodiment of the invention;
FIG. 5 is a graph showing the f-tan θ distortion of the optical system provided by the first embodiment of the present invention;
FIG. 6 is a schematic diagram of an optical system with diopter of 0 degree according to the second embodiment of the present invention;
FIG. 7 is an astigmatism graph of an optical system provided by a second embodiment of the invention;
FIG. 8 is a graph showing the f-tan θ distortion of an optical system provided by a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of an optical system provided by a third embodiment of the invention when diopter is 0 °;
FIG. 10 is an astigmatism graph of an optical system provided by a third embodiment of the invention;
fig. 11 is a f-tan θ distortion graph of an optical system provided by a third embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides an optical system which can fold an incident light path for multiple times so as to effectively reduce the thickness of the optical system.
The display unit is used for providing a polarized light source for the optical system.
The first lens comprises a first surface facing the display unit and a second surface facing away from the display unit, and the second lens comprises a third surface facing the display unit and a fourth surface facing away from the display unit; the third lens includes a fifth surface facing the display unit and a sixth surface facing away from the display unit.
The first lens has a positive optical power, the first surface is convex, and the first surface is provided with a partial reflector that is partially reflective to reflect a portion of received light. In some embodiments, the partial reflector is configured to transmit about 50% of incident light and reflect about 50% of incident light, and in particular, the partial reflector may be a semi-transparent reflective film plated or attached to the first surface, and the second surface is convex at the paraxial region.
The second lens has a negative optical power, the third surface is convex, and the fourth surface is concave at a paraxial region.
The third lens has positive focal power, the fifth surface is a plane, and the sixth surface is a convex surface.
The composite film layer is disposed on the fifth surface; the first lens and the second lens can be dynamically moved on an optical axis as a whole, and the air separation distance between the composite film layer and the second lens on the optical axis is adjusted. Through adjusting the whole (the air space between first, two lenses is unchangeable) position on the optical axis that comprises first, two lenses, be about to the whole that first, two lenses are constituteed towards the direction that is close to or keeps away from display element and carry out dynamic shift, can realize compound rete and the air space's of second lens on the optical axis dynamic adjustment, and then can realize diopter's regulation, make and carry on optical system's VR equipment realizes that diopter is adjustable, can better satisfy the user demand of different near-sighted degrees.
The composite film layer sequentially comprises a phase delay sheet and a reflective polarizing sheet along the light transmission direction; the reflective polarizer has a transmission axis, and has reflection and transmission effects on incident light, and as one embodiment, the reflective polarizer may be a reflective polarizing film formed by a coating process and configured to allow polarized light having a polarization direction parallel to the transmission axis to pass therethrough and reflect polarized light having a polarization direction perpendicular to the transmission axis. The phase delay plate can be a 1/4 wave plate and can realize the interconversion of linearly polarized light and circularly polarized light.
In some embodiments, the composite film layer further includes a polarizer disposed on a side away from the phase retarder, the polarizer being capable of further filtering out incident light with other polarization states and passing only polarized light with a polarization direction parallel to the transmission axis.
The invention also provides a VR device comprising an optical system as described above.
In some optional embodiments, the optical system satisfies the following conditional expression:
3<f1/f<4；（1）
where f denotes an effective focal length of the optical system, and f1 denotes an effective focal length of the first lens. The ratio of the effective focal length of the first lens in the whole optical system is reasonably controlled by meeting the conditional expression (1), so that the aberration of the lens in different diopters can be corrected, and the imaging quality of the optical system can be improved.
In some optional embodiments, the optical system satisfies the following conditional expression:
6<f S1 /f<7；（2）
wherein f represents an effective focal length of the optical system, f S1 Representing the effective focal length of the first surface. The ratio of the effective focal length of the first surface in the whole optical system is reasonably controlled to meet the conditional expression (2), so that the zigzag degree of incident light rays is favorably reduced, the optical system has a larger visual field angle, and the total optical length of the optical system is favorably shortened.
In some optional embodiments, the optical system satisfies the following conditional expression:
1<R S2 /f1<1.5；（3）
0<(R S2 +R S1 )/(R S2 -R S1 )<0.3；（4）
wherein R is S1 Denotes the radius of curvature, R, of the first surface S2 Denotes a radius of curvature of the second surface, and f1 denotes an effective focal length of the first lens. Satisfying conditional expressions (3) and (4), by reasonably controlling the surface types of the first surface and the second surface, it is advantageous to correct the aberration of the light during reflection and to shorten the total length of the optical system.
In some optional embodiments, the optical system satisfies the following conditional expression:
0<R S4 /f2<0.5；（5）
-10<f2/f<-5；（6）
wherein R is S4 Denotes a radius of curvature of the fourth surface, f2 denotes an effective focal length of the second lens, and f denotes an effective focal length of the optical system. The optical system meets the conditional expressions (5) and (6), and is beneficial to correcting the aberration of the off-axis field of view and improving the resolution quality of the optical system by reasonably controlling the surface type and the focal length distribution of the second lens.
In some optional embodiments, the optical system satisfies the following conditional expression:
-6<(R S4 +R S3 )/(R S4 -R S3 )<-1；（7）
wherein R is S3 Represents a radius of curvature, R, of the third surface S4 Represents a radius of curvature of the fourth surface. Satisfy conditional expression (7), through the face type of reasonable control third surface and fourth surface, can effectively slow down the turning degree of light, can make optical system all has better image quality when different diopters, improves VR equipment's whole image quality.
In some optional embodiments, the optical system satisfies the following conditional expression:
2<R S6 /f<5；（8）
3<f3/f<8；（9）
wherein R is S6 Denotes a radius of curvature of the sixth surface, f denotes an effective focal length of the optical system, and f3 denotes an effective focal length of the third lens. The optical system satisfies conditional expressions (8) and (9), and can effectively increase the exit angle of light from the sixth surface by reasonably controlling the focal length of the third lens and the curvature radius of the sixth surface, so that the optical system has a larger field range, provides a larger eye movement range, and is beneficial to reducing the sensitivity of the optical system.
In some optional embodiments, the optical system satisfies the following conditional expression:
-1<R S6 /R S1 <-0.5；（10）
wherein R is S1 Denotes the radius of curvature, R, of the first surface S6 Represents a radius of curvature of the sixth surface. The optical system meets the conditional expression (10), and the curvature radiuses of the light rays on the incident surface and the emergent surface are reasonably set, so that the optical system is favorable for realizing multiple turn-back in the system, the total length of the optical path is enlarged, the total length of the optical system is reduced, and the miniaturization is realized.
In some optional embodiments, the optical system satisfies the following conditional expression:
0°≤P≤800°；（11）
wherein P represents diopter of the optical system. The optical system can realize the adjustability of myopia at 0-800 degrees by satisfying the conditional expression (11), and users with different myopia degrees have good sensory experience when wearing the optical system.
In some optional embodiments, the optical system satisfies the following conditional expression:
5mm<T1+T2<7mm；（12）
wherein T1 denotes an air space between the display unit and the first lens on the optical axis, and T2 denotes an air space between the second lens and the composite film layer on the optical axis. Satisfy above-mentioned conditional expression (12), through the whole and the air interval between front and back part sum of the whole lens battery that first, two lenses of reasonable setting are constituteed, can effectively adjust optical system's diopter, better satisfy the user demand of different near-sighted degrees.
In some optional embodiments, the optical system satisfies the following conditional expression:
0.5<CT1/CT3<1.0；（13）
0.7<CT2/CT3<1.0；（14）
wherein CT1 denotes a center thickness of the first lens, CT2 denotes a center thickness of the second lens, and CT3 denotes a center thickness of the third lens. The central thickness of each lens can be reasonably distributed according to the conditional expressions (13) and (14), so that the sensitivity of the optical system is reduced, the production yield is improved, the structure of the optical system is compact, and the ultra-thinning of the optical system is realized.
As an embodiment, the first lens, the second lens, and the third lens may adopt spherical lenses or aspheric lenses, and optionally, the first surface, the second surface, the third surface, the fourth surface, and the sixth surface may all adopt aspheric structures, and the aspheric structures may effectively reduce aberrations of the optical system compared with the spherical structures, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens.
In the present embodiment, as an implementation, when the lens surface in the optical system is an aspherical lens, the aspherical surface type satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, k is the conic coefficient, A 2i Is the aspheric surface type coefficient of 2i order.
According to the optical system and the VR equipment provided by the invention, through reasonably matching the shapes of three lenses with specific focal power and arranging the composite film layer at a specific position, light rays enter and exit the first lens and the second lens for three times, the total length of a light path is greatly increased, so that the folding of the light path is well realized, and the carried VR equipment has a compact size, a light weight and high imaging quality; because the adjacent first and second lenses can move dynamically on the optical axis as a whole (the air space between the first and second lenses is not changed), the air space between the composite film layer and the second lens can be dynamically adjusted, diopter adjustment can be realized, and meanwhile, the optical system also has a larger field angle and a larger eye movement range, and can bring excellent sensory experience to users.
The invention is further illustrated below in the following examples. In the following embodiments, the thickness, the radius of curvature, and the material selection of each lens in the optical system are different, and the specific differences can be referred to the parameter tables of the embodiments.
First embodiment
Referring to fig. 1 to 3, an optical system 100 according to a first embodiment of the present invention sequentially includes a display unit 10, a first lens 20, a second lens 30, a composite film 40, and a third lens 50 along a light transmission direction.
Wherein, the display unit 10 is used to provide a polarized light source for the optical system, specifically in this embodiment, the display unit 10 may be a display screen, which emits light for imaging display, and the emitted light may be left-handed circularly polarized light LCP.
The first lens 20 includes a first surface S1 facing the display unit 10 and a second surface S2 facing away from the display unit 10, the second lens 30 includes a third surface S3 facing the display unit 10 and a fourth surface S4 facing away from the display unit 10, and the third lens 50 includes a third surface S5 facing the display unit 10 and a fourth surface S6 facing away from the display unit 10.
The first lens 20 has positive focal power, the first surface S1 is a convex surface, and a partial reflector is disposed on the first surface S1, specifically in this embodiment, the partial reflector may be a semi-transparent and semi-reflective film plated or attached to the first surface S1; the second surface S2 is convex at the paraxial region.
The second lens element 30 has a negative power, the third surface S3 is convex, and the fourth surface S4 is concave at the paraxial region.
The composite film layer 40 includes a phase retarder 41 and a reflective polarizer 42 in this order along the light transmission direction. The phase retardation plate 41 can be a 1/4 wave plate film plated on the fourth surface S4 or a 1/4 wave plate attached to the fourth surface S4, and can realize the mutual conversion of linearly polarized light and circularly polarized light; the reflective polarizer 42 may be a reflective polarizing film formed by a plating method and configured to totally reflect S-linearly polarized light and totally transmit P-linearly polarized light.
The third lens 50 has positive power, the fifth surface S5 is a plane, and the sixth surface S6 is a convex surface.
The first lens element 20, the second lens element 30 and the third lens element 50 are all plastic aspheric lenses.
Please refer to fig. 3, in which fig. 3 is a schematic diagram illustrating light transmission of an optical system in a VR device, in which an object plane is a virtual image plane observed by human eyes in the VR device, and an image plane is a display unit in the VR device. The light transmission process of the optical system 100 is as follows: left-handed circularly polarized light LCP is emitted from the display unit 10, and the LCP light sequentially transmits through the first lens 20 and the second lens 30 and then is converted into S-linearly polarized light after passing through the phase retarder 41 for the first time; the S-linearly polarized light is totally reflected when propagating to the reflective polarizer 42, and is reflected as S-linearly polarized light traveling in the opposite direction; the S linearly polarized light is converted into LCP light again after passing through the phase retardation plate 41 for the second time; LCP light is transmitted to the first surface S1 of the first lens 20 after passing through the second lens 30 and the first lens 20, and is reflected into right-handed circularly polarized light RCP by the first surface S1 because the first surface S1 is plated with a semi-transparent and semi-reflective film; the RCP light passes through the second surface S2 of the first lens 20 and the second lens 30, then passes through the phase retarder 41 for the third time, and is converted into P-linear polarized light; the P-linearly polarized light passes through the reflective polarizer 42, is fully transmitted, and propagates through the third lens 50 into the human eye. In order to filter out the light in other polarization states and transmit only P-linear polarized light, the composite film 40 may further include a polarizer 43, where the polarizer 43 is disposed on the side of the reflective polarizer 42 away from the phase retarder 41.
The air space T2 between the composite film 40 and the second lens 30 on the optical axis can be dynamically adjusted as required, that is, the whole lens assembly composed of the first and second lenses can be dynamically adjusted between the display unit 10 and the composite film 40 as required, but the sum of the air space between the whole lens assembly composed of the first and second lenses and the front and rear components (i.e. T1+ T2) remains unchanged; specifically, in the embodiment, the adjustment range of T2 is 1.364 to 5.362mm, the corresponding adjustment range of T1 is 4.698 to 0.7mm, and myopia adjustment at 0 to 800 ° can be realized, so that users with different myopia degrees have good sensory experience when wearing the glasses. Referring to fig. 1, a distance T2 between the composite film 40 and the second lens 30 on the optical axis is 5.362mm, a distance T1 between the display unit 10 and the first lens 20 on the optical axis is 0.7mm, an achievable diopter is 0 °, and an angle of view is 95 °; referring to fig. 2, the distance between the composite film 40 and the second lens 30 on the optical axis is 1.364mm, the distance T1 between the display unit 10 and the first lens 20 on the optical axis is 4.698mm, the achievable diopter is 800 °, and the viewing angle is 107 °.
The first embodiment of the present invention provides the optical system 100 with the relevant parameters of each lens shown in table 1.
TABLE 1
The surface shape coefficients of the aspherical surfaces of the optical system 100 according to the first embodiment of the present invention are shown in table 2.
TABLE 2
Referring to fig. 4, an astigmatism graph of the optical system 100 is shown, in which the horizontal axis represents a shift amount (unit: mm) and the vertical axis represents a field angle (unit: degree). As can be seen from fig. 4, the meridional field curvature and the sagittal field curvature of different wavelengths are both within ± 1.0mm, indicating that the astigmatism of the optical system 100 is well corrected.
Referring to fig. 5, a graph of f-tan θ distortion of the optical system 100 is shown, in which the horizontal axis represents the distortion percentage and the vertical axis represents the field angle (unit: degree). As can be seen from fig. 5, the f-tan θ distortion at different image heights on the image plane is controlled within ± 35% and is a negative value, indicating that the distortion of the optical system 100 is well corrected.
Second embodiment
Referring to fig. 6, a schematic structural diagram of an optical system 200 according to a second embodiment of the present invention is shown, where the optical system 200 according to the second embodiment of the present invention has substantially the same structure as the optical system 100 according to the first embodiment, and mainly includes differences in curvature radius and material selection of each lens, an adjustment range of an air interval T2 between the composite film layer 40 and the second lens 30 on the optical axis is 1.363 to 5.364mm, and an adjustment range of T1 corresponding thereto is 4.701 to 0.7mm.
Referring to table 3, related parameters of each lens of the optical system 200 according to the second embodiment of the invention are shown.
TABLE 3
Referring to table 4, the surface type coefficients of the aspheric surfaces of the optical system 200 according to the second embodiment of the present invention are shown.
TABLE 4
Referring to fig. 7, a graph of astigmatism of the optical system 200 is shown, and it can be seen from fig. 7 that the meridional field curvature and the sagittal field curvature of different wavelengths are both within ± 0.5mm, which indicates that the astigmatism of the optical system 200 is well corrected.
Referring to fig. 8, a f-tan θ distortion curve of the optical system 200 is shown, and it can be seen from fig. 8 that the f-tan θ distortion at different image heights on the image plane is controlled within ± 35% and is a negative value, which indicates that the distortion of the optical system 200 is well corrected.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical system 300 according to a third embodiment of the present invention is shown, where the optical system 300 according to the third embodiment of the present invention has a substantially same structure as the optical system 100 according to the first embodiment, and mainly includes that curvature radii and material choices of the lenses are different, an adjustment range T2 of an air interval between the composite film layer 40 and the second lens 30 on an optical axis is 1.379 to 5.387mm, and an adjustment range T1 corresponding thereto is 4.709 to 0.701mm.
Referring to table 5, parameters associated with each lens of the optical system 300 according to the third embodiment of the invention are shown.
TABLE 5
Referring to table 6, the third embodiment of the present invention provides a surface type coefficient of each aspheric surface of the optical system 300.
TABLE 6
Referring to fig. 10, a graph of astigmatism of the optical system 300 is shown, and it can be seen from fig. 10 that the meridional field curvature and the sagittal field curvature of different wavelengths are both within ± 0.4mm, which indicates that the astigmatism of the optical system 300 is well corrected.
Referring to fig. 11, a f-tan θ distortion curve of the optical system 300 is shown, and it can be seen from fig. 11 that the f-tan θ distortion at different image heights on the image plane is controlled within ± 35% and is a negative value, which indicates that the distortion of the optical system 300 is well corrected.
Referring to table 7, the optical characteristics of the optical system provided in the above three embodiments respectively include the field angle FOV, the effective focal length f, the exit pupil distance ED, the entrance pupil diameter EPD, the total optical length TTL (representing the distance from the sixth surface to the display screen), the half-image height IH (representing the diagonal length of the display unit), and the related values corresponding to each of the above conditional expressions.
TABLE 7
In summary, the optical system provided by the invention has the following advantages:
(1) Three aspheric lenses with specific focal power are adopted, and each lens realizes multiple turn-back of a light path through specific surface shape collocation, so that the total length of the light path is effectively enlarged, on one hand, the optical system has shorter total optical length (TTL is not more than 19 mm), thereby shortening the total length of the whole VR equipment, being beneficial to lightening and thinning the VR equipment, on the other hand, the optical system has larger field angle (FOV can reach 95-110 degrees), greatly improving the immersion of a user, and further bringing better experience for the user.
(2) According to the invention, by adjusting the position of the whole lens group consisting of the first lens and the second lens on the optical axis, the dynamic adjustment of the air interval between the composite film layer and the second lens on the optical axis can be realized, the diopter adjustment in a larger range (0-800 degrees) can be realized, the imaging quality is higher, the requirements of different myopic users can be met, and meanwhile, the exit pupil distance is larger (larger than 11 mm), so that better experience can be provided for the users.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical system is characterized in that 3 lenses with focal power are provided, and the optical system sequentially comprises a display unit, a first lens, a second lens, a composite film layer and a third lens along the light transmission direction;
the display unit is used for providing a polarized light source for the optical system;
the first lens comprises a first surface facing the display unit and a second surface facing away from the display unit, and the second lens comprises a third surface facing the display unit and a fourth surface facing away from the display unit; the third lens comprises a fifth surface facing the display unit and a sixth surface facing away from the display unit;
the first lens has positive optical power, the first surface is convex, and the first surface is provided with a partial reflector, the second surface is convex at a paraxial region;
the second lens has a negative optical power, the third surface is convex, and the fourth surface is concave at a paraxial region;
the composite film layer sequentially comprises a phase delay sheet and a reflective polarizing sheet along the light transmission direction;
the third lens has positive focal power, the fifth surface is a plane, and the sixth surface is a convex surface;
the composite film layer is disposed on the fifth surface; the first lens and the second lens can be dynamically moved on an optical axis as a whole, and the air separation distance between the composite film layer and the second lens on the optical axis is adjusted;
the optical system satisfies the following conditional expression:
3<f1/f<4；
where f denotes an effective focal length of the optical system, and f1 denotes an effective focal length of the first lens.
2. The optical system according to claim 1, wherein the optical system satisfies the following conditional expression:
6<f S1 /f<7；
wherein f represents an effective focal length of the optical system, f S1 Representing the effective focal length of the first surface.
3. The optical system according to claim 1, wherein the optical system satisfies the following conditional expression:
1<R S2 /f1<1.5；
0<(R S2 +R S1 )/(R S2 -R S1 )<0.3；
wherein R is S1 Denotes the radius of curvature, R, of the first surface S2 Denotes a radius of curvature of the second surface, and f1 denotes an effective focal length of the first lens.
4. The optical system according to claim 1, wherein the optical system satisfies the following conditional expression:
0<R S4 /f2<0.5；
-10<f2/f<-5；
wherein R is S4 Denotes a radius of curvature of the fourth surface, f2 denotes an effective focal length of the second lens, and f denotes an effective focal length of the optical system.
5. The optical system according to claim 1, wherein the optical system satisfies the following conditional expression:
-6<(R S4 +R S3 )/(R S4 -R S3 )<-1；
wherein R is S3 Represents a radius of curvature, R, of the third surface S4 Represents a radius of curvature of the fourth surface.
6. The optical system according to claim 1, wherein the optical system satisfies the following conditional expression:
2<R S6 /f<5；
3<f3/f<8；
wherein R is S6 Denotes a radius of curvature of the sixth surface, f denotes an effective focal length of the optical system, and f3 denotes an effective focal length of the third lens.
7. The optical system according to claim 1, wherein the optical system satisfies the following conditional expression:
-1<R S6 /R S1 <-0.5；
wherein R is S1 Denotes the radius of curvature, R, of the first surface S6 Represents a radius of curvature of the sixth surface.
8. The optical system according to claim 1, wherein the optical system satisfies the following conditional expression:
0°≤100×P≤800°；
wherein P represents a diopter of the optical system.
9. The optical system according to claim 1, wherein the optical system satisfies the following conditional expression:
5mm<T1+T2<7mm；
wherein T1 denotes an air space between the display unit and the first lens on the optical axis, and T2 denotes an air space between the second lens and the composite film layer on the optical axis.
10. A VR device, characterized in that the VR device comprises an optical system according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211015987.5A CN115079408B (en) | 2022-08-24 | 2022-08-24 | Optical system and VR equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211015987.5A CN115079408B (en) | 2022-08-24 | 2022-08-24 | Optical system and VR equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115079408A CN115079408A (en) | 2022-09-20 |
| CN115079408B true CN115079408B (en) | 2022-12-02 |
Family
ID=83245347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211015987.5A Active CN115079408B (en) | 2022-08-24 | 2022-08-24 | Optical system and VR equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115079408B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI823809B (en) * | 2023-04-13 | 2023-11-21 | 新鉅科技股份有限公司 | Optical lens assembly and head-mounted electronic device |
| CN116880048B (en) * | 2023-09-07 | 2024-01-05 | 江西晶浩光学有限公司 | Optical system and head-mounted device |
| CN117434731B (en) * | 2023-12-14 | 2024-03-15 | 南昌龙旗信息技术有限公司 | Optical module and VR display device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100555478B1 (en) * | 1999-06-18 | 2006-03-03 | 삼성전자주식회사 | Optical pickup apparatus being able to detect stable error signal |
| EP3189359A1 (en) * | 2015-09-03 | 2017-07-12 | 3M Innovative Properties Company | Optical system |
| CN215494359U (en) * | 2021-08-04 | 2022-01-11 | 北京灵犀微光科技有限公司 | Near-to-eye display device |
| CN114578569A (en) * | 2022-03-18 | 2022-06-03 | 广州立景创新科技有限公司 | Display module and method of manufacturing the same |
-
2022
- 2022-08-24 CN CN202211015987.5A patent/CN115079408B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115079408A (en) | 2022-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115079408B (en) | Optical system and VR equipment | |
| US9952450B2 (en) | Chromatic-difference-free wide-angle camera for head-mounted device, and head-mounted device | |
| CN108303796B (en) | Eyepiece lens | |
| CN116047773B (en) | Optical system and near-eye display device | |
| CN115268009B (en) | Optical system and head-mounted device | |
| CN116736492B (en) | Optical system and optical apparatus | |
| CN115097614B (en) | Optical system and VR equipment | |
| CN116626896A (en) | Optical system and virtual reality device | |
| CN116125668A (en) | Optical system | |
| CN116381911A (en) | Optical system | |
| CN116466488A (en) | Optical system and optical apparatus including the same | |
| CN116009126A (en) | VR optical system and near-to-eye display device | |
| TWI811774B (en) | Optical lens assembly and head-mounted device | |
| CN116338959A (en) | Optical system | |
| CN116974073A (en) | Optical system | |
| CN117270218B (en) | Optical system and near-eye display device | |
| CN220626781U (en) | Virtual reality system | |
| CN220154728U (en) | VR optical system | |
| CN116880048B (en) | Optical system and head-mounted device | |
| CN117130166B (en) | Optical system and near-eye display device | |
| CN117233973B (en) | Optical system and VR equipment | |
| CN220626779U (en) | Virtual reality system | |
| CN117518420A (en) | Optical system and near-eye display device | |
| CN220709459U (en) | Visual system and VR equipment comprising same | |
| CN116859609A (en) | Virtual reality system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |