CN116047773A - Optical system and near-eye display device - Google Patents
Optical system and near-eye display device Download PDFInfo
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- CN116047773A CN116047773A CN202310238281.3A CN202310238281A CN116047773A CN 116047773 A CN116047773 A CN 116047773A CN 202310238281 A CN202310238281 A CN 202310238281A CN 116047773 A CN116047773 A CN 116047773A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0856—Catadioptric systems comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors
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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
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
Abstract
The invention discloses an optical system and a near-eye display device, which sequentially comprise the following components from a display side to a human eye side along a light transmission direction: the first lens, the second lens, the third lens, the composite film layer and the fourth lens; the first lens has negative optical power; the second lens has positive focal power, the third surface is a convex surface, and the third surface is provided with a partial reflector; the third lens has positive focal power, the fifth surface is a convex surface, and the sixth surface is a convex surface; the composite film layer sequentially comprises a phase delay sheet and a reflective polarizer along the light transmission direction, and is arranged on the seventh surface; the fourth lens has positive focal power, the seventh surface is a plane, and the eighth surface is a convex surface; the first lens and the second lens can move dynamically on the optical axis as a whole and are used for adjusting the air interval distance between the whole formed by the first lens and the second lens and the third lens on the optical axis. The optical system has the advantages of large angle of view, total length and adjustable diopter.
Description
Technical Field
The present invention relates to the field of optical lenses, and in particular, to an optical system and a near-to-eye display device.
Background
With the development of Virtual Reality (VR) technology, the forms and types of virtual reality devices are increasingly diverse, and the application fields, such as near-eye displays, head-mounted display devices, and the like, are also increasingly wide. The head-mounted display device transmits image light emitted by the display to the pupil of a user through an optical technology, virtual and enlarged images are realized in the near-eye range of the user, visual image and video information are provided for the user, and the near-eye optical system is the core of the head-mounted display device, so that the function of forming a virtual enlarged image by displaying the image on the display in front of human eyes is realized.
In order to provide excellent sensory experience for users, a near-eye optical system is generally required to have smaller overall length, larger field angle and higher quality imaging, and meanwhile, in order to meet users with different myopia degrees, diopter adjustment is also required, however, the current folding optical system also has the defects of smaller field angle, poor diopter adjustment, poor imaging quality and the like, and cannot well meet the market demands.
Disclosure of Invention
Therefore, the present invention is directed to an optical system and a near-eye display device, which have the advantages of larger angle of view, adjustable total length, diopter and higher imaging quality.
The embodiment of the invention realizes the aim through the following technical scheme.
In one aspect, an embodiment of the present invention provides an optical system, including, in order from a display side to a human eye side along a light transmission direction: the lens comprises a first lens, a second lens, a third lens, a composite film layer and a fourth lens.
The first lens comprises a first surface facing the display side and a second surface facing the human eye side, and the second lens comprises a third surface facing the display side and a fourth surface facing the human eye side; the third lens comprises a fifth surface facing the display side and a sixth surface facing the human eye side; the fourth lens includes a seventh surface facing the display side and an eighth surface facing the human eye side.
The first lens has a negative optical power.
The second lens has positive optical power, the third surface is convex, and the third surface is provided with a partial reflector.
The third lens has positive focal power, the fifth surface is a convex surface, and the sixth surface is a convex surface.
The composite film layer sequentially comprises a phase delay plate and a reflective polarizer along the light transmission direction, and the composite film layer is arranged on the seventh surface.
The fourth lens has positive focal power, the seventh surface is a plane, and the eighth surface is a convex surface.
The first lens and the second lens can move dynamically on the optical axis as a whole and are used for adjusting the air interval distance between the whole formed by the first lens and the second lens and the third lens on the optical axis.
In another aspect, the present invention also provides a near-eye display device, including: a display unit, an optical system as described above; the display unit is used for providing polarized light signals for the optical system; the optical system is arranged in the light emitting direction of the display unit, wherein the first lens is closer to the light emitting surface of the display unit than the fourth lens; the optical system is used for modulating the optical signal sent by the display unit so that the human eye side can receive the modulated image information.
The optical system and the near-to-eye display device provided by the invention adopt four lenses with specific focal power, and the composite film layer is arranged between the third lens and the fourth lens, so that the lenses realize multiple turning back of the light path through specific surface shape collocation and film layer arrangement, the total length of the light path is enlarged, the optical system has a larger angle of view and a shorter total length, the total length of the light path is increased, the overall thickness of the optical system is greatly reduced, and the light and thin of carried equipment are facilitated; meanwhile, the larger field angle can provide a display effect of a wide field of view, so that the immersion of the user is improved, and better experience is brought to the user. Meanwhile, the position of the whole of the first lens and the second lens on the optical axis is adjusted, so that the dynamic adjustment of the air interval between the whole of the first lens and the second lens and the air interval between the whole of the first lens and the third lens on the optical axis can be realized, the diopter adjustment is realized, and meanwhile, the optical system also has a larger exit pupil distance, and excellent sensory experience can be brought to a user.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of an optical system according to a first embodiment of the present invention when diopter is 0 °.
Fig. 2 is a schematic view of the optical system according to the first embodiment of the present invention when the diopter is 500 °.
Fig. 3 is a schematic diagram illustrating light transmission in a near-eye display device according to a first embodiment of the invention.
Fig. 4 is an astigmatic chart of an optical system provided by the first embodiment of the present invention.
Fig. 5 is a graph of f-tan θ distortion of an optical system provided by a first embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an optical system according to a second embodiment of the present invention when diopter is 0 °.
Fig. 7 is an astigmatic chart of an optical system according to a second embodiment of the present invention.
Fig. 8 is a graph of f-tan θ distortion of an optical system provided by a second embodiment of the present invention.
Fig. 9 is a schematic view of the optical system according to the third embodiment of the present invention when the diopter is 0 °.
Fig. 10 is an astigmatic chart of an optical system according to a third embodiment of the present invention.
Fig. 11 is a graph of f-tan θ distortion of an optical system provided by a third embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the invention are presented in the figures. 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.
In this context, near the optical axis means the area near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region.
The present invention provides an optical system capable of folding an incident optical path a plurality of times to effectively reduce the thickness of the optical system, specifically comprising, in order from a display side to a human eye side along a light transmission direction: the lens comprises a first lens, a second lens, a third lens, a composite film layer and a fourth lens.
The first lens comprises a first surface facing the display side and a second surface facing the human eye side, and the second lens comprises a third surface facing the display side and a fourth surface facing the human eye side; the third lens comprises a fifth surface facing the display side and a sixth surface facing the human eye side; the fourth lens includes a seventh surface facing the display side and an eighth surface facing the human eye side.
The first lens has a negative optical power, the first surface may be convex or concave, and the second surface is concave at a paraxial region.
The second lens has positive optical power, the third surface is convex, and the third surface is provided with a partial reflector that is partially reflective to reflect a portion of the received light. In some embodiments, the partial reflector is configured to transmit about 50% of the incident light and reflect about 50% of the incident light, and in particular, the partial reflector may be a semi-transparent semi-reflective film plated or attached on the third surface; the fourth surface is concave.
The third lens has positive focal power, the fifth surface is a convex surface, and the sixth surface is a convex surface.
The fourth lens has positive focal power, the seventh surface is a plane, and the eighth surface is a convex surface.
The composite film layer is arranged on the seventh surface, and the seventh surface is a plane, so that the arrangement and the processing of the film layer are facilitated, and the film coating yield and the processability are improved.
The first lens and the second lens can move dynamically on the optical axis as a whole and are used for adjusting the air interval distance between the whole formed by the first lens and the second lens and the third lens on the optical axis; the optical axis position of the whole body formed by the first lens and the second lens (the air interval and the relative position between the first lens and the second lens are kept unchanged) is adjusted, namely, the whole body formed by the first lens and the second lens dynamically moves towards the direction close to or far away from the display side (one side of the display unit), so that the dynamic adjustment of the air interval between the whole body formed by the first lens and the second lens and the air interval between the third lens on the optical axis can be realized, further, the diopter adjustment can be realized by the near-eye display equipment carrying the optical system, and the user demands of different myopia degrees can be better met.
The composite film layer sequentially comprises a phase delay sheet and a reflective polarizer along the light transmission direction; the reflective polarizer has a transmission axis, and reflects and transmits incident light, and as an embodiment, the reflective polarizer may be a reflective polarizing film formed by a plating method 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 retarder may be a 1/4 wave plate capable of realizing the mutual conversion of linearly polarized light and circularly polarized light.
In some embodiments, the composite film layer further includes a polarizer disposed on a side remote from the retarder, the polarizer being capable of further filtering incident light of other directions of polarization, and passing only polarized light having a polarization direction parallel to the transmission axis.
In some alternative embodiments, the optical system satisfies the following conditional expression: 0.7< TTL/(f×tan θ) <1, wherein TTL represents a distance on an optical axis from an eighth surface of the fourth lens to the display side, f represents an effective focal length of the optical system, and θ represents a maximum half field angle of the optical system. The above conditions are satisfied, so that the optical system can obtain smaller total optical length, and a larger field angle is realized, and the development direction of the near-eye display device can be better satisfied.
In some alternative embodiments, the optical system satisfies the following conditional expression: -20< f1/f < -1 > wherein f represents an effective focal length of the optical system and f1 represents an effective focal length of the first lens. The above conditions are satisfied, and the focal length of the first lens is reasonably controlled, so that the aberration of the lens at different diopters can be corrected, and the overall imaging quality of the optical system is improved.
In some alternative embodiments, the optical system satisfies the following conditional expression: -3<(R S2 +R S1 )/(R S2 -R S1 )<-0.3, wherein R S1 Representing the radius of curvature of the first surface, R S2 Representing the radius of curvature of the second surface. The surface shape of the first lens is reasonably controlled to be favorable for correcting the aberration of light rays in the secondary reflection process and improving the overall imaging quality.
In some alternative embodiments, the optical system satisfies the following conditional expression: 0.8< f2/f3<1.5, wherein f2 represents an effective focal length of the second lens and f3 represents an effective focal length of the third lens. The optical path folding device meets the above conditions, and can enable light to enter the second lens and the third lens more gently by reasonably setting the focal length distribution of the second lens and the third lens, so that the optical path folding effect in the system is better, the total length of the optical path is enlarged, and the thickness of the whole system is reduced.
In some alternative embodiments, the optical system satisfies the following conditional expression: 8<f2/f<15，1<(R S4 +R S3 )/(R S4 -R S3 )<5, wherein f2 represents the second lensThe effective focal length of the mirror, f denotes the effective focal length of the optical system, R S3 Representing the radius of curvature of the third surface, R S4 Representing the radius of curvature of the fourth surface. The conditions are met, the surface type and focal length distribution of the second lens are reasonably controlled, the aberration of the off-axis view field is corrected, and the resolution quality of the optical system in the whole view field is improved.
In some alternative embodiments, the optical system satisfies the following conditional expression: 7<f3/f<12，-0.5<(R S6 +R S5 )/(R S6 -R S5 )<0.5, wherein f represents an effective focal length of the optical system, f3 represents an effective focal length of the third lens, R S5 Representing the radius of curvature of the fifth surface, R S6 Representing the radius of curvature of the sixth surface. The optical system meets the conditions, and the turning degree of light can be effectively slowed down by reasonably controlling the surface type and the focal length of the third lens, so that the optical system has better imaging quality in different diopters, and the imaging quality of the near-eye display device is improved.
In some alternative embodiments, the optical system satisfies the following conditional expression: 5<R S6 /f<15, wherein R is S6 And f represents the effective focal length of the optical system. The above conditions are satisfied, and by reasonably setting the curvature radius of the sixth surface, the emergence angle of the light from the sixth surface can be effectively increased, so that the optical system has a larger field of view range, and a larger eye movement range is provided.
In some alternative embodiments, the optical system satisfies the following conditional expression: 12<f4/f<25，8<R S8 /f<15, wherein f represents an effective focal length of the optical system, f4 represents an effective focal length of the fourth lens, R S8 Representing the radius of curvature of the eighth surface. The optical lens system meets the conditions, and the focal length of the fourth lens and the curvature radius of the light rays on the emitting surface are reasonably set, so that the fourth lens has good light collecting capacity, the light rays at a large field angle can be better converged, the correction difficulty of the marginal field aberration can be reduced, and the imaging quality of the system at the large field angle can be improved.
In some alternative embodiments, the optical system satisfies the following conditional expression: and 0 DEG.ltoreq.P.ltoreq.500 DEG, wherein P represents the diopter of the optical system. The conditions are met, and the optical system can achieve 0-500-degree myopia adjustability, and users with different myopia degrees wear the optical system with good sensory experience.
In some alternative embodiments, the optical system satisfies the following conditional expression: 2mm < T1+T2<4mm, wherein T1 represents a distance on an optical axis of the first surface of the first lens to the display side, and T2 represents a distance on the optical axis of the second lens and the third lens. The optical system has the advantages that the diopter of the optical system can be effectively regulated by reasonably setting the sum of the air intervals between the whole lens group consisting of the first lens and the second lens and the front part and the rear part, and the user demands of different myopia degrees can be better met.
In some alternative embodiments, the optical system satisfies the following conditional expression: 1.5< CT2/CT1<2.0,0.5< CT4/CT3<0.8, wherein CT1 represents a center thickness of the first lens, CT2 represents a center thickness of the second lens, CT3 represents a center thickness of the third lens, and CT4 represents a center thickness of the fourth lens. The central thickness of each lens can be reasonably distributed, the sensitivity of the optical system is reduced, the production yield is improved, and meanwhile, the optical system is compact in structure, and the optical system is ultrathin.
As an embodiment, the first lens, the second lens, the third lens and the fourth lens may be spherical lenses or aspherical lenses, and optionally, the first surface, the second surface, the third surface, the fourth surface, the fifth surface, the sixth surface and the eighth surface may all adopt aspherical structures, and compared with spherical structures, the aspherical structures can effectively reduce aberration of the optical system, thereby reducing the number of lenses and reducing the size of lenses, and better realizing miniaturization of lenses.
In this example, as one embodiment, when the lens surface in the optical system is an aspherical lens, the aspherical surface type satisfies the following equation:
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h in the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient conic, A 2i The aspherical surface profile coefficient of the 2 i-th order.
According to the optical system and the near-eye display device, the four lenses with specific focal power are reasonably matched, and the composite film layer and the partial reflector are arranged at specific positions, so that light rays enter and exit three times in the second lens and the third lens, the total length of an optical path is greatly increased, the folding of the optical path is well realized, and the carried near-eye display device has compact size, light weight and high imaging quality; because the adjacent first lens and the adjacent second lens can dynamically move on the optical axis as a whole (the air interval between the first lens and the second lens is unchanged), the air interval between the whole formed by the first lens and the second lens and the air interval between the third lens can be dynamically adjusted, diopter adjustment can be realized, and meanwhile, the optical system also has a larger angle of view and an eye movement range, and excellent sensory experience can be brought to users.
The invention is further illustrated in the following examples. In the following embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical system are different, and the specific differences can be seen from the parameter table of each embodiment.
First embodiment
Referring to fig. 1 to 3, an optical system 100 according to a first embodiment of the present invention includes, in order from a display side S0 to a human eye side along a light transmission direction, a first lens 20, a second lens 30, a third lens 40, a composite film layer 50 and a fourth lens 60.
The display side S0 may be a light-emitting surface side of the display unit 10, where the display unit 10 is configured to provide a polarized light source for an optical system, and 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 circularly polarized light LCP.
The first lens 20 includes a first surface S1 facing the display side and a second surface S2 facing the human eye side, and the second lens 30 includes a third surface S3 facing the display side and a fourth surface S4 facing the human eye side; the third lens 40 includes a fifth surface S5 facing the display side and a sixth surface S6 facing the human eye side; the fourth lens 60 includes a seventh surface S7 facing the display side and an eighth surface S8 facing the human eye side.
The first lens 20 has negative power, the first surface S1 is convex at a paraxial region, and the second surface S2 is concave.
The second lens 30 has positive focal power, the third surface S3 is a convex surface, and a partial reflector is disposed on the third surface S3, and in this embodiment, the partial reflector may be a semi-transparent semi-reflective film plated or attached to the third surface S3; the fourth surface S4 is concave.
The third lens 40 has positive power, the fifth surface S5 is convex, and the sixth surface S6 is convex.
The composite film layer 50 includes a phase retarder 51 and a reflective polarizer 52 in this order along the light transmission direction. The phase retarder 51 may be a 1/4 wave plate film coated on the seventh surface S7 or a 1/4 wave plate attached on the seventh surface S7, capable of realizing the interconversion of linearly polarized light and circularly polarized light; the reflective polarizing plate 52 may be a reflective polarizing film formed by a film coating method, and is configured to be totally reflective for S-linear polarized light and totally transmissive for P-linear polarized light.
The fourth lens 60 has positive power, the seventh surface S7 is a plane, and the eighth surface S8 is a convex surface.
The first lens 20, the second lens 30, the third lens 40 and the fourth lens 60 are all plastic aspherical lenses.
Referring to fig. 3, a schematic diagram of light transmission in a near-eye display device 400 is shown in the application of the optical system 100 of the present embodiment to the near-eye display device 400, wherein an object plane is a virtual image plane observed by a human eye in the near-eye display device, and an image plane is a display unit 10 in the near-eye display device. The near-eye display device 400 includes, in order from a display side to a human eye side along a light incident direction OX, a display unit 10, a first lens 20, a second lens 30, a third lens 40, a composite film layer 50, and a fourth lens 60; wherein the display unit 10 is used for providing a polarized light source for an optical system; the first lens 20, the second lens 30, the third lens 40, the composite film layer 50, and the fourth lens 60 constitute an optical system 100.
The light transmission process of the near-eye display device 400 is as follows: the left circularly polarized light LCP is emitted from the display unit 10, and the LCP light is sequentially transmitted through the first lens 20, the second lens 30, and the third lens 40, and then is converted into S-linearly polarized light after passing through the phase retarder 51 for the first time; the S-linearly polarized light is totally reflected when propagating to the reflective polarizing film 52, and is reflected as S-linearly polarized light traveling in the opposite direction; the S linearly polarized light passes through the phase retarder 51 for the second time and is converted into LCP light again; the LCP light propagates onto the third surface S3 of the second lens 30 after passing through the third lens 40 for the second time, and as the third surface S3 is coated with a semi-transparent semi-reflective film, the LCP light is reflected by the third surface S3 into right circularly polarized light RCP; the RCP light passes through the second lens 30 and the third lens 40 for the third time, and then passes through the phase retarder 51 for the third time, and is converted into P linearly polarized light; the P linearly polarized light passes through the reflective polarizing film 52 and is transmitted through the fourth lens 60 to enter the human eye. To better filter out light polarized in other directions, only P linearly polarized light is transmitted, the composite film layer 50 may further include a polarizer 53, where the polarizer 53 is disposed on a side of the reflective polarizing film 52 away from the retarder 51.
The distance T2 between the third lens 40 and the second lens 30 on the optical axis can be dynamically adjusted according to the requirement, that is, the whole lens group composed of the first lens and the second lens can be dynamically adjusted between the display unit 10 and the third lens 40 according to the requirement, but the sum of the air intervals (namely, t1+t2) between the whole first lens and the second lens and the front and rear parts is kept unchanged; specifically, in the embodiment, the adjusting range of T2 is 0.556-1.714mm, and the adjusting range of T1 corresponding to the adjusting range is 0.993-2.151mm, so that myopia adjustment of 0-500 degrees can be realized, and users with different myopia degrees wear the device with good sensory experience. Referring to fig. 1, the distance T2 between the third lens element 40 and the second lens element 30 on the optical axis is 1.714mm, the distance T1 between the display screen 10 and the first surface S1 of the first lens element 20 on the optical axis is 0.993mm, the achievable diopter is 0 °, and the angle of view is 95 °; referring to fig. 2, the distance between the third lens 40 and the second lens 30 on the optical axis is 0.556mm, the distance T1 between the display screen 10 and the first surface S1 of the first lens 20 on the optical axis is 2.151mm, the achievable diopter is 500 ° and the angle of view is 100 °.
The relevant parameters of each lens in the optical system 100 according to the first embodiment of the present invention are shown in table 1.
TABLE 1
The surface profile coefficients of the aspherical surfaces of the optical system 100 provided in the first embodiment of the present invention are shown in table 2.
TABLE 2
Referring to fig. 4, an astigmatic chart of the optical system 100 is shown, in which the horizontal axis represents the amount of offset (in mm) and the vertical axis represents the angle of view (in degrees). As can be seen from fig. 4, both the meridional field curvature and the sagittal field curvature of different wavelengths are within ±0.4mm, indicating that the astigmatism of the optical system 100 is well corrected.
Referring to FIG. 5, an f-tan θ distortion graph of an optical system 100 is shown, wherein the horizontal axis represents the distortion percentage and the vertical axis represents the angle of view (in degrees). As can be seen from fig. 5, the f-tan θ distortion at different image heights on the imaging plane is controlled within ±35% and negative, 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, and 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 is mainly characterized in that the first surface S1 is concave at a paraxial region, curvature radii and material choices of the lenses are different, and an adjusting range of an air space T2 between the third lens 40 and the second lens 30 on the optical axis is 0.444-1.653 mm, and a corresponding adjusting range of T1 is 1.302-2.511 mm.
Referring to table 3, the parameters of each lens in the optical system 200 according to the second embodiment of the invention are shown.
TABLE 3 Table 3
Referring to table 4, the surface coefficients of each aspheric surface of the optical system 200 according to the second embodiment of the present invention are shown.
TABLE 4 Table 4
Referring to fig. 7, an astigmatic chart of the optical system 200 is shown, and as can be seen from fig. 7, both the meridional field curvature and the sagittal field curvature of different wavelengths are within ±0.2mm, which indicates that the astigmatic effect of the optical system 200 is well corrected.
Referring to fig. 8, a graph of f-tan θ distortion of the optical system 200 is shown, and as can be seen from fig. 8, f-tan θ distortion at different image heights on the imaging plane is controlled within ±35% and is negative, 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, and the optical system 300 according to the third embodiment of the present invention has substantially the same structure as the optical system 100 according to the first embodiment, and is mainly characterized in that the first surface is concave at a paraxial region, the curvature radius and material selection of each lens are different, and the air gap adjusting range T2 between the third lens 40 and the second lens 30 on the optical axis is 0.585-1.710 mm, and the corresponding T1 adjusting range is 1.092-2.217 mm.
Referring to table 5, the parameters of each lens in 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 the surface coefficients of each aspheric surface of the optical system 300.
TABLE 6
Referring to fig. 10, an astigmatic chart of the optical system 300 is shown, and as can be seen from fig. 10, both the meridional field curvature and the sagittal field curvature of different wavelengths are within ±0.4mm, which indicates that the astigmatic effect of the optical system 300 is well corrected.
Referring to fig. 11, a graph of f-tan θ distortion of the optical system 300 is shown, and as can be seen from fig. 11, f-tan θ distortion at different image heights on the imaging plane is controlled within ±35% and is negative, 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 by the above three embodiments mainly include the angle of view FOV, focal length f, exit pupil distance ED, entrance pupil diameters EPD, TTL, and half image height IH (representing half of the horizontal length of the display unit), and the correlation values corresponding to each of the above conditions.
TABLE 7
In summary, the optical system and the near-eye display device provided by the invention have at least the following advantages:
(1) According to the invention, four lenses with specific focal power are adopted, and the composite film layer is arranged between the third lens and the fourth lens, so that the lenses realize multiple turn-back of the light path through specific surface shape collocation and film layer arrangement, the total length of the light path is effectively enlarged, the optical system has a shorter total length (TTL is not more than 16 mm), the light and thin performance of the carried near-eye display device is facilitated, on the other hand, the optical system has a larger angle of view (FOV can reach 95-100 degrees), the immersion of a user is greatly improved, the carried near-eye display device has a larger angle of view, a more compact structure and a clearer resolution in the whole field of view, and the visual experience of the user is effectively improved.
(2) According to the invention, the position of the whole lens group formed by the first lens and the second lens on the optical axis is adjusted, so that the dynamic adjustment of the air interval between the third lens and the second lens on the optical axis can be realized, the diopter adjustment (0-500 degrees) in a larger range can be realized, the requirements of users with different myopia degrees are met, the imaging quality is higher under different diopters, the monocular 4K display screen can be matched, the exit pupil distance (ED can reach 11 mm) is larger, and better experience feeling can be provided for the users.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (13)
1. An optical system, characterized by comprising, in order from a display side to a human eye side in a light transmission direction: the first lens, the second lens, the third lens, the composite film layer and the fourth lens;
the first lens comprises a first surface facing the display side and a second surface facing the human eye side, and the second lens comprises a third surface facing the display side and a fourth surface facing the human eye side; the third lens comprises a fifth surface facing the display side and a sixth surface facing the human eye side; the fourth lens comprises a seventh surface facing the display side and an eighth surface facing the human eye side;
the first lens has negative optical power;
the second lens has positive focal power, the third surface is a convex surface, and the third surface is provided with a partial reflector;
the third lens has positive focal power, the fifth surface is a convex surface, and the sixth surface is a convex surface;
the composite film layer sequentially comprises a phase delay sheet and a reflective polarizer along the light transmission direction, and is arranged on the seventh surface;
the fourth lens has positive focal power, the seventh surface is a plane, and the eighth surface is a convex surface;
the first lens and the second lens can move dynamically on the optical axis as a whole and are used for adjusting the air interval distance between the whole formed by the first lens and the second lens and the third lens on the optical axis.
2. The optical system of claim 1, wherein the first surface is concave or convex and the second surface is concave at a paraxial region; the fourth surface is concave.
3. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: 0.7< TTL/(f×tan θ) <1, wherein TTL represents a distance on an optical axis from an eighth surface of the fourth lens to the display side, f represents an effective focal length of the optical system, and θ represents a maximum half field angle of the optical system.
4. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: -20< f1/f < -1 > wherein f represents an effective focal length of the optical system and f1 represents an effective focal length of the first lens.
5. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: -3<(R S2 +R S1 )/(R S2 -R S1 )<-0.3, wherein R S1 Representing the radius of curvature of the first surface, R S2 Representing the radius of curvature of the second surface.
6. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: 0.8< f2/f3<1.5, wherein f2 represents an effective focal length of the second lens and f3 represents an effective focal length of the third lens.
7. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: 8<f2/f<15，1<(R S4 +R S3 )/(R S4 -R S3 )<5, wherein f2 represents the effective focal length of the second lens, f represents the effective focal length of the optical system, R S3 Representing the radius of curvature of the third surface, R S4 Representing the radius of curvature of the fourth surface.
8. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: 7<f3/f<12，-0.5<(R S6 +R S5 )/(R S6 -R S5 )<0.5, wherein f represents an effective focal length of the optical system, and f3 represents presence of the third lensEffective focal length, R S5 Representing the radius of curvature of the fifth surface, R S6 Representing the radius of curvature of the sixth surface.
9. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: 5<R S6 /f<15, wherein R is S6 And f represents the effective focal length of the optical system.
10. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: 12<f4/f<25，8<R S8 /f<15, wherein f represents an effective focal length of the optical system, f4 represents an effective focal length of the fourth lens, R S8 Representing the radius of curvature of the eighth surface.
11. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: and 0 DEG.ltoreq.P.ltoreq.500 DEG, wherein P represents the diopter of the optical system.
12. The optical system of claim 1, wherein the optical system satisfies the following conditional expression: 2mm < T1+T2<4mm, wherein T1 represents a distance on an optical axis of the first surface of the first lens to the display side, and T2 represents a distance on the optical axis of the second lens and the third lens.
13. A near-eye display device, comprising: a display unit, an optical system according to any one of claims 1-12;
the display unit is used for providing polarized light signals for the optical system;
the optical system is arranged in the light emitting direction of the display unit, wherein the first lens is closer to the light emitting surface of the display unit than the fourth lens; the optical system is used for modulating the optical signal sent by the display unit so that the human eye side can receive the modulated image information.
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| CN116047773B (en) | 2023-08-01 |
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