CN115236847B - Eyepiece optical system and head-mounted display device - Google Patents
Eyepiece optical system and head-mounted display device Download PDFInfo
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- CN115236847B CN115236847B CN202211140057.2A CN202211140057A CN115236847B CN 115236847 B CN115236847 B CN 115236847B CN 202211140057 A CN202211140057 A CN 202211140057A CN 115236847 B CN115236847 B CN 115236847B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—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
- 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 eyepiece optical system and a head-mountThe display device is used for imaging the imaging light rays entering the eyes of the user from the display unit through the eyepiece optical system; the eyepiece optical system sequentially comprises a display unit, a first lens, a second lens and a third lens from a display side to an eye side along a light transmission direction; the display unit is used for providing an image light source for the eyepiece optical system; the first lens has positive focal power, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a concave surface; the second lens has negative focal power, the eye side surface of the second lens is a convex surface, and the display side surface of the second lens is a concave surface; the third lens has positive focal power, the eye side surface of the third lens is a convex surface, and the display side surface of the third lens is a convex surface; air space CT between first lens and display unit on optical axis W And (4) dynamic adjustability. The eyepiece optical system provided by the invention has the advantages of short total length, large field angle, small distortion and adjustable diopter, so that users with different diopter degrees can have good sensory experience when wearing the eyepiece optical system.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an eyepiece optical system and a head-mounted display device.
Background
With the development of virtual reality technology, the forms and the types of Virtual Reality (VR) devices are increasingly diversified, and the application fields are increasingly wide, at present, head-mounted display devices are popular with consumers due to the characteristics of small size, light weight and the like, the head-mounted display devices transmit video image light emitted by a display to pupils of the users through optical technology, so that virtual and magnified images are realized in the near-eye range of the users, visual and visible images, video information and an eyepiece optical system are provided for the users, and the function of displaying the images on the display on the virtual magnified images formed in front of the eyes of the users is realized.
In order to provide excellent sensory experience for users, an eyepiece optical system needs to have a larger field angle, a longer eye distance and higher-quality imaging, and meanwhile, in order to meet users with different myopia or hyperopia degrees, the eyepiece optical system also needs to have diopter adjustability.
Disclosure of Invention
Based on this, the invention aims to provide an eyepiece optical system and a head-mounted display device, which have the advantages of at least large field angle, total length and adjustable diopter.
The embodiment of the invention achieves the aim through the following technical scheme.
In one aspect, an embodiment of the present invention provides an eyepiece optical system, configured to allow imaging light to enter an eye of a user from a display unit through the eyepiece optical system for imaging, where a direction toward the eye of the user is a target side, and a direction toward the display unit is a display side, and the eyepiece optical system sequentially includes, from the display side to the target side, a display unit, a first lens, a second lens, and a third lens along a light transmission direction; the first lens, the second lens and the third lens respectively comprise an eye side surface and a display side surface;
the display unit is used for providing an image light source for the eyepiece optical system;
the first lens has positive focal power, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a concave surface;
the second lens has negative focal power, the eye side surface of the second lens is a convex surface, and the display side surface of the second lens is a concave surface;
the third lens has positive focal power, the eye side surface of the third lens is a convex surface, and the display side surface of the third lens is a convex surface;
the air interval CT between the first lens and the display unit on the optical axis W The dynamic adjustment is realized;
wherein at least one of the first lens, the second lens and the third lens is a glass lens.
In another aspect, the present invention also provides a head-mounted display apparatus including the eyepiece optical system as described above, the eyepiece optical system being located between a user's eye and the display unit.
Compared with the prior art, the eyepiece optical system and the head-mounted display device provided by the invention adopt three lenses with specific refractive power, and the three lenses are matched through specific surface shapes, so that the eyepiece optical system and the head-mounted display device have the advantages that the structure is more compact while small distortion is met, meanwhile, the display effect of a wide field of view can be provided due to a larger field angle, the immersion feeling of a user is improved, and better experience feeling is brought to the user. The adjustment of different diopters can be realized by adjusting the air spacing distance between the lens system and the display unit on the optical axis, so that the wearing requirements of users with different vision can be met; meanwhile, the eyepiece optical system also has a larger exit pupil distance, so that excellent sensory experience can be brought to a user.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an eyepiece optical system 100 provided in a first embodiment of the present invention at diopter 0D;
fig. 2 shows a field curvature graph of the eyepiece optical system 100 provided by the first embodiment of the present invention at diopter 0D;
fig. 3 shows a distortion curve of the eyepiece optical system 100 provided by the first embodiment of the present invention at diopter 0D;
fig. 4 is a graph showing a vertical axis chromatic aberration of the eyepiece optical system 100 provided by the first embodiment of the present invention at diopter 0D;
fig. 5 is a schematic structural diagram of an eyepiece optical system 200 provided in a second embodiment of the present invention at diopter 0D;
fig. 6 shows a field curvature graph of the eyepiece optical system 200 provided by the second embodiment of the present invention at diopter 0D;
fig. 7 shows a distortion curve of the eyepiece optical system 200 at diopter 0D provided by the second embodiment of the present invention;
fig. 8 is a graph showing the vertical axis chromatic aberration of the eyepiece optical system 200 provided by the second embodiment of the present invention at diopter 0D;
fig. 9 is a schematic structural view of an eyepiece optical system 300 provided in a third embodiment of the present invention at diopter 0D;
fig. 10 shows a field curvature graph of an eyepiece optical system 300 provided by a third embodiment of the present invention at diopter 0D;
fig. 11 shows a distortion curve of an eyepiece optical system 300 provided by the third embodiment of the present invention at diopter 0D;
fig. 12 is a graph showing a vertical axis chromatic aberration of an eyepiece optical system 300 provided by a third embodiment of the present invention at diopter 0D;
fig. 13 shows a schematic diagram of an optical path in the head mounted display apparatus provided in the fourth 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 embodiment of the invention provides an eyepiece optical system, which is used for imaging light entering eyes of a user from a display unit through the eyepiece optical system, wherein the direction facing the eyes of the user is an eye side, the direction facing the display unit is a display side, and the eyepiece optical system sequentially comprises the display unit, a first lens, a second lens and a third lens from the display side to the eye side along the light transmission direction; the first lens, the second lens and the third lens respectively comprise an eye side surface and a display side surface;
the display unit is used for providing an image light source for the eyepiece optical system.
The first lens has positive focal power, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a concave surface.
The second lens has negative focal power, the eye side surface of the second lens is a convex surface, and the display side surface of the second lens is a concave surface.
The third lens has positive focal power, the eye side surface of the third lens is a convex surface, and the display side surface of the third lens is a convex surface.
The air interval CT between the first lens and the display unit on the optical axis W The diopter of the eyepiece optical system can be adjusted by adjusting the air interval between the display unit and the first, second and third lens groups, so that the user requirements of different myopia or hyperopia degrees can be met; preferably, the first lens is spaced from the display unit by an air space CT on an optical axis W Satisfies the following conditions: 1.5mm<CT W <8.0mm by adjusting CT W The value of (2) can realize the adjustment of different diopters, and meets the wearing requirements of users with different vision.
At least one of the first lens, the second lens and the third lens is a glass lens, so that aberration of the system can be better corrected by adopting the glass lens, and the resolving power of the eyepiece optical system is improved.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
1.2<TTL/f<1.6；（1）
wherein f represents an effective focal length of the eyepiece optical system, and TTL represents an optical total length of the eyepiece optical system. The ratio of the total length of the optical system to the effective focal length can be reasonably controlled by satisfying the conditional expression (1), and the shorter optical total length is favorably realized.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0.5<f/f1<1；（2）
-2.0<f/f2<-0.5；（3）
wherein f denotes an effective focal length of the eyepiece optical system, f1 denotes an effective focal length of the first lens, and f2 denotes an effective focal length of the second lens. The optical system meets the conditional expressions (2) and (3), and the focal length ratio of the first lens and the second lens is reasonably controlled, so that the aberration of the optical system in different diopters can be favorably corrected, and the imaging quality of the eyepiece optical system is improved.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
1<R S1 /f<2；（4）
-5<(R S2 +R S1 )/(R S2 -R S1 )<-1；（5）
wherein f represents an effective focal length of the eyepiece optical system, R S1 Represents a radius of curvature, R, of a display side surface of the first lens S2 Represents a radius of curvature of the eye-side surface of the first lens. The method satisfies conditional expressions (4) and (5), can reasonably control the surface shape of the first lens, is favorable for correcting the distortion of an off-axis field of view, and improves the resolution quality of the eyepiece optical system.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0.7<R S3 / R S2 <2；（6）
wherein R is S2 Represents a radius of curvature, R, of the eye side surface of the first lens S3 Represents a radius of curvature of the display side of the second lens. And the conditional expression (6) is satisfied, so that the light has a smaller angle when the light is incident into the first lens and the second lens, the correction of the vertical axis chromatic aberration of the eyepiece optical system is facilitated, and the resolution quality of the eyepiece optical system is improved.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0.5<f/f3<1.5；（7）
wherein f denotes an effective focal length of the eyepiece optical system, and f3 denotes an effective focal length of the third lens. And the conditional expression (7) is satisfied, and the focal length of the third lens is reasonably controlled to account for the ratio, so that the ocular optical system has a larger exit pupil distance, and the total optical length of the ocular optical system is favorably shortened.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
0.5<R S6 / f<1；（8）
wherein R is S6 A radius of curvature of an eye-side surface of the third lens, and f an effective focal length of the eyepiece optical system. Satisfy conditional expression (8), through the camber that rationally sets up third lens mesh side surface, reduce the incident angle that light got into third lens mesh side surface, make eyepiece optical system has great field of view scope, is favorable to rectifying simultaneously eyepiece optical system's optical distortion.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
25<V1<57；（9）
1.6<N1<2.0；（10）
15<V2<25；（11）
1.7<N2<2.0；（12）
wherein V1 represents an abbe number of the first lens, V2 represents an abbe number of the second lens, N1 represents a refractive index of the first lens, and N2 represents a refractive index of the second lens. Satisfy conditional expression (9) to (12), the material of selecting first lens and second lens can rationally be arranged, is favorable to rectifying eyepiece optical system's colour difference improves optical lens's imaging quality.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
-4D≤P≤5D；（13）
wherein P represents a diopter of the eyepiece optical system. The condition formula (13) is met, and the eyepiece optical system can realize diopters of-4D to-5D, so that users with different myopia or hyperopia degrees can wear the eyepiece optical system with good sensory experience. When light is incident from an object to another substance having a different optical density, the propagation direction of the light is deflected, which is called refraction, and the unit representing the size (refractive power) of the refraction is diopter (abbreviated as "D"). 1 diopter or 1D equals 100 degrees in common.
In some optional embodiments, the eyepiece optical system satisfies the following conditional expression:
12<IH/OH<16；（14）
where OH denotes a diagonal length of the display unit, and IH denotes a maximum image height of an image plane observed by the user's eye. And the conditional expression (14) is met, so that the eyepiece optical system has larger magnification, and a user has good sensory experience when wearing the eyepiece optical system.
In one embodiment, the first lens, the second lens and the third lens may be spherical lenses or aspherical lenses; preferably, first lens and second lens are glass sphere lens, and the third lens adopts plastic aspheric surface lens, moulds the reasonable collocation of mixing the lens through adopting the glass, under the prerequisite that reduces lens quantity, can better guarantee optical system's imaging quality, shortens whole optical system's overall length, better realizes the miniaturization of camera lens and the equilibrium of high image quality.
As an embodiment, when the lens surface in the optical system is an aspherical surface, each aspherical surface type of the optical system may satisfy the following equation:
wherein z is the distance rise from the aspheric surface vertex at the position of height h along the optical axis direction, c is the paraxial curvature radius of the surface, and k is the conic coefficient, A 2i Is the aspheric surface type coefficient of 2i order.
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 eyepiece optical system are different, and specific differences can be referred to in the parameter tables of the embodiments.
First embodiment
As shown in fig. 1, for a schematic structural diagram of an eyepiece optical system 100 provided in an embodiment of the present invention, a direction toward an eye 20 of a user is a target side, a direction toward the display unit 10 is a display side, and image information emitted from the display unit 10 enters the eye 20 of the user through the eyepiece optical system 100 to be imaged; specifically, the eyepiece optical system 100 includes a display unit 10, a first lens L1, a second lens L2, and a third lens L3 in sequence along a light transmission direction from a display side to a target side, where the first lens L1, the second lens L2, and the third lens L3 each include a target side surface and a display side surface; the first lens element L1 and the second lens element L2 are both glass spherical lenses, and the third lens element L3 is a plastic aspheric lens.
Specifically, the first lens L1 has positive focal power, the eye side surface S2 of the first lens is a convex surface, and the display side surface S1 of the first lens is a concave surface;
the second lens L2 has negative focal power, the eye side surface S4 of the second lens is a convex surface, and the display side surface S3 of the second lens is a concave surface;
the third lens element L3 has positive refractive power, the eye side S6 of the third lens element is convex, and the display side S5 of the third lens element is convex.
Referring to table 1, table 1 shows the parameters related to each lens of the eyepiece optical system 100 according to the first embodiment of the present invention.
TABLE 1
The aspherical surface profile coefficient of the third lens L3 in the eyepiece optical system 100 provided by the first embodiment of the present invention is shown in table 2.
TABLE 2
To meet the wearing requirements of users with different diopters, the air space CT between the first lens L1 and the display unit 10 on the optical axis can be dynamically adjusted W To achieve adjustment of the eyepiece optics between different diopters, in particular, the air space CT in this embodiment W Is adjusted inThe diopter of-400 to 500 degrees can be adjusted within the range of 1.956 to 4.91mm, so that the glasses have good sensory experience when worn by users with different myopia or hyperopia degrees. As shown in fig. 1, a schematic view of the eyepiece optical system 100 is shown in a configuration where diopter is 0D (0 °), where the entire lens group 30 composed of the first lens L1, the second lens L2, and the third lens L3 and the display unit 10 are separated by a distance of 3.596mm on the optical axis; when the entire lens group 30 and the display unit 10 are spaced apart by 4.91mm on the optical axis, the diopter of the eyepiece optical system 100 at this time is-4D (-400 °); when the entire lens group and the display unit 10 are spaced apart by 1.956mm on the optical axis, the diopter of the eyepiece optical system 100 at this time is 5D (500 °); separation distance CT on optical axis of the entire lens group and display unit 10 W The lens can be dynamically adjusted between 1.956 to 4.91mm, so that the wearing requirements of users with different diopters can be well met.
Referring to fig. 2, a field curvature graph of the eyepiece optical system 100 is shown, in which the horizontal axis represents the offset (unit: mm) and the vertical axis represents the image height (unit: mm) received by the user's eye. As can be seen from fig. 2, the meridional field curvature and the sagittal field curvature of different wavelengths are both within ± 0.2mm, which indicates that the field curvature of the eyepiece optical system 100 is well corrected.
Referring to fig. 3, a distortion graph of the eyepiece optical system 100 is shown, in which the horizontal axis represents the distortion percentage and the vertical axis represents the image height (unit: mm) received by the user's eye. As can be seen from fig. 3, the optical distortion at different image heights on the image plane is controlled within ± 2%, which indicates that the distortion of the eyepiece optical system 100 is well corrected.
Referring to fig. 4, a vertical axis chromatic aberration graph of the eyepiece optical system 100 is shown, in which the horizontal axis represents the vertical axis chromatic aberration value (unit: micrometer) of each wavelength with respect to the center wavelength (0.54 um), and the vertical axis represents the image height received by the eyes of the normalized user. As can be seen from fig. 4, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 10 microns, which indicates that the eyepiece optical system 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Second embodiment
Referring to fig. 5, a schematic diagram of an eyepiece optical system 200 according to a second embodiment of the present invention is shown, where the eyepiece optical system 200 according to the second embodiment of the present invention has substantially the same structure as the eyepiece optical system 100 according to the first embodiment, and mainly includes differences in curvature radius, material selection, and lens thickness of each lens, and an air interval CT on an optical axis between the entire lens group and the display unit 10 W The adjusting range is 1.998-4.984 mm, and the diopter of the eyepiece optical system 200 at-400-500 degrees can be adjusted.
Referring to table 3, parameters related to each lens of the eyepiece optical system 200 according to the second embodiment of the present invention are shown.
TABLE 3
The aspherical surface type coefficient of the third lens in the eyepiece optical system 200 provided by the second embodiment of the present invention is shown in table 4.
TABLE 4
Referring to fig. 6, a field curvature graph of the eyepiece optical system 200 is shown. As can be seen from fig. 6, both the meridional field curvature and the sagittal field curvature of different wavelengths are within ± 0.2mm, which indicates that the field curvature of the eyepiece optical system 200 is well corrected.
Referring to fig. 7, a distortion curve diagram of the eyepiece optical system 200 is shown. As can be seen from fig. 7, the optical distortion at different image heights on the image plane is controlled within ± 2%, indicating that the distortion of the eyepiece optical system 200 is well corrected.
Referring to fig. 8, a vertical axis chromatic aberration diagram of eyepiece optical system 200 is shown. As can be seen from fig. 8, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 10 microns, which indicates that the eyepiece optical system 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Third embodiment
Referring to fig. 9, a schematic diagram of an eyepiece optical system 300 according to a third embodiment of the present invention is shown, where the eyepiece optical system 300 according to the third embodiment of the present invention has substantially the same structure as the eyepiece optical system 100 according to the first embodiment, and mainly includes differences in curvature radius, material selection, and lens thickness of each lens, and an air interval CT on an optical axis between the entire lens group and the display unit 10 W The adjusting range is 3.774 to 6.761mm, and the diopter of the eyepiece optical system 300 can be adjusted within-400 to 500 degrees.
Referring to table 3, parameters related to each lens of the eyepiece optical system 300 according to the third embodiment of the present invention are shown.
TABLE 5
The third embodiment of the present invention provides an eyepiece optical system 300 in which the aspherical surface type coefficient of the third lens is as shown in table 4.
TABLE 6
Referring to fig. 10, a field curvature graph of the eyepiece optical system 300 is shown. As can be seen from fig. 10, the meridional field curvature and the sagittal field curvature of different wavelengths are within ± 0.25mm at different diopters, which indicates that the field curvature of the eyepiece optical system 300 is well corrected.
Referring to fig. 11, a distortion curve diagram of eyepiece optical system 300 is shown. As can be seen from fig. 11, the optical distortion at different image heights on the imaging surface is controlled within ± 2% at different diopters, which indicates that the distortion of the eyepiece optical system 300 is well corrected.
Referring to fig. 12, a vertical axis chromatic aberration diagram of eyepiece optical system 300 is shown. As can be seen from fig. 12, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 10 um under different diopters, which indicates that the eyepiece optical system 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Please refer to table 7, which shows the optical characteristics of the eyepiece optical systems provided in the above three embodiments, mainly including the effective focal length f, the exit pupil distance ED, the entrance pupil diameter EPD, the total optical length TTL, the maximum image height IH of the user's eye viewing the image plane, and the like of the optical system, and the related values corresponding to each of the above conditional expressions.
TABLE 7
In summary, the eyepiece optical system provided by the embodiment of the invention has the following advantages:
(1) Three lenses with specific refractive power are adopted, and glass-plastic mixing and specific surface shape matching of each lens are adopted, so that the optical system has shorter optical total length, the total length of the whole head-mounted display equipment system is shortened, and the miniaturization and light weight of the head-mounted display equipment are facilitated; the optical distortion of the whole eyepiece optical system is within +/-2%, which shows that the optical system has very small optical distortion and basically very small image distortion or deformation degree, thereby bringing better sensory experience to users.
(2) The air interval between the whole lens group and the display unit on the optical axis is adjusted, so that the adjustment of different diopters can be realized (-400 to 500 ℃), the optical system has higher imaging quality under different diopters, and the wearing requirements of users with different myopia or hyperopia degrees can be met;
(3) Because the focal power and the surface type of each lens are reasonably arranged, the optical system has a larger field angle and a larger exit pupil distance, and can provide better experience for users.
Fourth embodiment
The fourth embodiment of the present invention provides a head-mounted display device 400, where the head-mounted display device 400 includes an eyepiece optical system (e.g., eyepiece optical system 100) in any of the above embodiments, the eyepiece optical system 100 is located between the user's eye 20 and the display unit 10, preferably, the display unit 10 may be one of Micro LED, OLED, LCD, LCOS, and M-OLED, and in this embodiment, the display unit 10 may employ a 0.39 inch M-OLED display screen with a resolution of 1080P, which can provide high-definition image picture information for the eyepiece optical system 100. Referring to fig. 13, which is a schematic diagram of an optical path in the head-mounted display apparatus 400, image information sent from the display unit 10 enters the eye 20 of the user through the eyepiece optical system 100 to be imaged, and a virtual image with high definition magnification can be observed in the eye of the user, so that the user has a very realistic sensory experience.
The head-mounted display device 400 provided by the embodiment comprises the eyepiece optical system, and the eyepiece optical system has the advantages of short total length, large field angle, small distortion and adjustable diopter, so that the head-mounted display device 400 with the eyepiece optical system also has the advantages of miniaturization, light weight, high resolving power and adjustable diopter, and users with different diopter wear the head-mounted display device with good sensory experience.
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-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present 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 patent should be subject to the appended claims.
Claims (10)
1. An eyepiece optical system for imaging light entering a user's eye from a display unit through the eyepiece optical system, the direction toward the user's eye being a viewing side and the direction toward the display unit being a display side, the eyepiece optical system being composed of three lenses having optical powers, the eyepiece optical system comprising, in order along a light transmission direction from the display side to the viewing side, the display unit, a first lens, a second lens, and a third lens; the first lens, the second lens and the third lens respectively comprise an eye side surface and a display side surface;
the display unit is used for providing an image light source for the eyepiece optical system;
the first lens has positive focal power, the eye side surface of the first lens is a convex surface, and the display side surface of the first lens is a concave surface;
the second lens has negative focal power, the eye side surface of the second lens is a convex surface, and the display side surface of the second lens is a concave surface;
the third lens has positive focal power, the eye side surface of the third lens is a convex surface, and the display side surface of the third lens is a convex surface;
an air space CT between the first lens and the display unit on the optical axis W The dynamic adjustment is realized;
wherein at least one of the first lens, the second lens and the third lens is a glass lens;
the eyepiece optical system satisfies the following conditional expression:
0.5<R S6 /f<1；
wherein R is S6 A radius of curvature of an eye-side surface of the third lens, and f an effective focal length of the eyepiece optical system.
2. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
1.5mm<CT W <8.0mm。
3. the eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
1.2<TTL/f<1.6；
wherein f represents an effective focal length of the eyepiece optical system, and TTL represents an optical total length of the eyepiece optical system.
4. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
0.5<f/f1<1；
-2.0<f/f2<-0.5；
wherein f denotes an effective focal length of the eyepiece optical system, f1 denotes an effective focal length of the first lens, and f2 denotes an effective focal length of the second lens.
5. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
1<R S1 /f<2；
-5<(R S2 +R S1 )/(R S2 -R S1 )<-1；
wherein f represents an effective focal length of the eyepiece optical system, R S1 Represents a radius of curvature, R, of a display side surface of the first lens S2 Represents a radius of curvature of a ocular surface of the first lens.
6. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
0.7<R S3 /R S2 <2；
wherein R is S2 Represents a radius of curvature, R, of the eye side surface of the first lens S3 Representing said second lensThe radius of curvature of the side is shown.
7. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
0.5<f/f3<1.5；
wherein f denotes an effective focal length of the eyepiece optical system, and f3 denotes an effective focal length of the third lens.
8. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
-4D≤P≤5D；
wherein P represents a diopter of the eyepiece optical system.
9. The eyepiece optical system according to claim 1, wherein the eyepiece optical system satisfies the following conditional expression:
12<IH/OH<16；
wherein OH denotes a diagonal length of the display unit, and IH denotes a maximum image height of an image plane observed by the user's eye.
10. A head-mounted display device characterized in that it comprises an eyepiece optical system according to any one of claims 1-9, which eyepiece optical system is located between a user's eye and the display unit.
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| JP2014074815A (en) * | 2012-10-04 | 2014-04-24 | Nikon Corp | Ocular optical system, optical device, and observation method |
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| US9134525B2 (en) * | 2011-03-01 | 2015-09-15 | Nikon Corporation | Ocular optical system and optical apparatus |
| CN107884924B (en) * | 2012-10-04 | 2021-03-23 | 株式会社尼康 | Eyepiece optical system and optical device |
| JP6195345B2 (en) * | 2013-04-01 | 2017-09-13 | キヤノン株式会社 | Eyepiece optical system, electronic viewfinder, and imaging device |
| JP6435784B2 (en) * | 2014-11-06 | 2018-12-12 | リコーイメージング株式会社 | Eyepiece optics |
| JP6435783B2 (en) * | 2014-11-06 | 2018-12-12 | リコーイメージング株式会社 | Eyepiece optics |
| JP2016166968A (en) * | 2015-03-10 | 2016-09-15 | キヤノン株式会社 | Eyepiece optical system |
| JP2016166969A (en) * | 2015-03-10 | 2016-09-15 | キヤノン株式会社 | Eyepiece lens |
| TWI707171B (en) * | 2019-12-04 | 2020-10-11 | 佐臻股份有限公司 | Ocular optical system |
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