CN113219664B - Imaging optical path and head-mounted display device - Google Patents
Imaging optical path and head-mounted display device Download PDFInfo
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- CN113219664B CN113219664B CN202110488570.XA CN202110488570A CN113219664B CN 113219664 B CN113219664 B CN 113219664B CN 202110488570 A CN202110488570 A CN 202110488570A CN 113219664 B CN113219664 B CN 113219664B
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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
Abstract
The invention discloses an imaging light path and a head-mounted display device, wherein the imaging light path comprises: the imaging lens is provided with a light inlet surface and a light outlet surface which form an included angle, and is also provided with a total reflection surface which is connected with the light inlet surface of the imaging lens and the light outlet surface of the imaging lens; the correcting lens group is arranged on one side of the light inlet surface of the imaging lens, light rays are emitted to the imaging lens through the correcting lens group, the light rays are emitted through the light inlet surface of the imaging lens, the incident angle of the light rays on the total reflection surface is larger than or equal to the critical angle of total reflection, and the light rays are reflected to the light outlet surface and transmitted to the light outlet surface. According to the technical scheme, the size of the head-mounted display device right in front of human eyes can be reduced, and the head-mounted display device is convenient for a user to wear.
Description
Technical Field
The invention relates to the technical field of optical display, in particular to an imaging light path and a head-mounted display device.
Background
A Head mounted display (Head mounted display) device is an electronic product capable of providing an immersive experience. The application of head-mounted display devices has gradually expanded to the fields of medical treatment, military, games, and the like. However, the conventional head-mounted display device is provided with a large number of optical devices right in front of the eyes of the user, so that the head-mounted display device right in front of the eyes of the user is large in size, bulky in the whole device and inconvenient to wear by the user.
Disclosure of Invention
Based on this, set up more lens to current head mounted display device in the dead ahead of user's eye, lead to the head mounted display device's in the dead ahead of people's eye volume great, the problem that the user of being not convenient for dresses, it is necessary to provide an imaging light path and head mounted display device, aim at reducing the head mounted display device's in the dead ahead of people's eye volume, the user of being convenient for dresses.
To achieve the above object, the present invention provides an imaging optical path, including:
the imaging lens is provided with a light inlet surface and a light outlet surface, the light inlet surface and the light outlet surface form an included angle, and the imaging lens is also provided with a total reflection surface which is connected with the light inlet surface of the imaging lens and the light outlet surface of the imaging lens; and
the correcting lens group is arranged on one side of the light inlet surface of the imaging lens, light rays are emitted to the imaging lens through the correcting lens group, the light rays are emitted through the light inlet surface of the imaging lens, the incident angle of the light rays on the total reflection surface is larger than or equal to the critical angle of total reflection, and the light rays are reflected to the light outlet surface and are transmitted to the light outlet surface.
Optionally, the light emitting surface of the imaging lens is a convex surface, and the convex direction of the light emitting surface of the imaging lens faces the light emitting direction of the imaging lens.
Optionally, a section of the center of the light incident surface of the imaging lens is a first section, a section of the center of the light emergent surface of the imaging lens is a second section, and the extending directions of the first section and the second section are orthogonal.
Optionally, at least one of the light incident surface of the imaging lens and the light emergent surface of the imaging lens is an aspheric surface.
Optionally, the imaging lens has an optical power of
Then:
optionally, the correction lens group includes a first lens, a second lens and a third lens, the first lens, the second lens and the third lens are sequentially arranged along a propagation direction of light, the first lens is a positive lens, the second lens is a negative lens, and the third lens is a positive lens.
Optionally, at least one of the light incident surface of the first lens, the light emergent surface of the first lens, the light incident surface of the second lens, the light emergent surface of the second lens, the light incident surface of the third lens, and the light emergent surface of the third lens is an aspheric surface.
Optionally, the first lens has an optical power of
The focal power of the second lens is
The focal power of the third lens is
Then:
the center thickness of the imaging lens is T 0 The center thickness of the first lens is T 1 The center thickness of the second lens is T 2 The center thickness of the third lens is T 3 Then, the following conditions are satisfied: 6mm<T 0 <15mm，1mm<T 1 <5mm，1mm<T 2 <5mm，2mm<T 3 <5mm。
Optionally, if a distance between the light incident surface of the imaging lens and a center point of a surface of the imaging lens adjacent to the third lens is D, the following may be satisfied: d is more than 2mm.
Furthermore, in order to achieve the above object, the present invention also provides a head-mounted display device including a housing and an imaging optical path as described above, the imaging optical path being provided to the housing.
In the technical scheme provided by the invention, light rays are incident through the light incident surface of the imaging lens, the light rays meet the total reflection condition of the light on the total reflection surface, the incident angle is greater than or equal to the total reflection critical angle, and the light rays are transmitted from the optically dense medium to the optically sparse medium. Therefore, the light is totally reflected, is emitted out through the light-emitting surface of the imaging lens, and is displayed at the position of human eyes for imaging. Because the light inlet surface and the light outlet surface form an included angle, the direction of light rays emitted to the imaging lens can be flexibly adjusted, and other optical devices such as a light source and the like can be arranged on one side of the light inlet surface of the imaging lens, so that the number of the optical devices arranged right in front of human eyes is reduced. Through the dispersed arrangement of the optical devices, the head-mounted display device is more concise, the whole overstaffed is avoided, and the head-mounted display device is convenient for a user to wear.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of an imaging lens in an imaging optical path according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of an imaging lens and a correcting lens group in an imaging optical path according to the present invention;
FIG. 3 is a diagram of a modulation transfer function of an embodiment of an imaging optical path of the present invention;
FIG. 4 is a dot-column diagram of an embodiment of an imaging beam path of the present invention;
FIG. 5 is a graph of field curvature and distortion for an embodiment of an imaging beam path of the present invention;
FIG. 6 is a chromatic aberration diagram of an embodiment of an imaging optical path of the present invention;
FIG. 7 is a diagram of relative illumination of an imaging beam path according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name(s) |
| 10 | |
220 | |
| 110 | Light incident surface | 230 | |
| 120 | |
30 | |
| 130 | |
40 | |
| 20 | |
50 | |
| 210 | |
60 | Human eye |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
In the related art, a head-mounted display apparatus arranges more optical devices such as a light source and various lenses for imaging directly in front of the eyes of a user. To enable accurate imaging display at the position of the human eye, the light travels a sufficiently long optical path, that is, requires a sufficient installation space. Therefore, the size of the head-mounted display device right in front of human eyes is large, the device obviously protrudes out of the face of a user, the whole display of the device is too bulky, the wearing of the user is very inconvenient, and the burden of the head is increased after the head-mounted display device is worn for a long time.
In order to solve the above problem, referring to fig. 1 and 2, the present invention provides an imaging optical path including: an imaging lens 10 and a corrector lens group 20. The imaging lens 10 is provided with a light incident surface 110 and a light emitting surface 120, the light incident surface 110 of the imaging lens 10 and the light emitting surface 120 of the imaging lens 10 form an included angle, the imaging lens 10 further includes a total reflection surface 130, and the total reflection surface 130 is connected to the light incident surface 110 and the light emitting surface 120; an included angle between the light incident surface 110 of the imaging lens 10 and the light emitting surface 120 of the imaging lens 10 may be an acute angle, an obtuse angle, or a mutually perpendicular relationship. The imaging lens 10 may be made of optical plastic, which is easily processed by injection molding. The material of the imaging lens 10 may also be optical glass, which is processed by grinding and has good optical properties, such as transmission and reflection.
The correcting lens group 20 is disposed on one side of the light incident surface of the imaging lens 10, and light is emitted to the imaging lens 10 through the correcting lens group 20. In order to further reduce the generation of aberration, a correcting lens group 20 is provided, and the correcting lens group 20 is used for correcting the focusing position of the light ray 30 to ensure that the light ray 30 is imaged clearly at the position of the human eye 60. The generation of aberration such as spherical aberration, chromatic aberration and distortion is reduced.
The light ray 30 enters through the light incident surface 110 of the imaging lens 10, the light ray 30 enters the total reflection surface 130 through the imaging lens 10, the incident angle of the light ray 30 on the total reflection surface 130 is greater than or equal to the critical angle of total reflection, and the light ray 30 is reflected to the light emitting surface 120 of the imaging lens 10 and transmits through the light emitting surface 120 of the imaging lens 10. The incident surface 110 of the imaging lens 10 meets the condition that an included angle is formed between the incident surface 110 and the emergent surface of the imaging lens 10, and the incident angle of the total reflection surface 130 of the light 30 passing through the incident surface 110 of the imaging lens 10 is larger than or equal to the critical angle of total reflection.
In addition, in this embodiment, the imaging lens 10 may be used in Virtual Reality (VR) technology, and in this case, the total reflection surface 130 may be further provided with a reflective film to improve the reflection efficiency of the light ray 30.
The imaging lens 10 in the present embodiment can also be used in Augmented Reality (AR) technology. At this time, the external light 30 may enter the interior of the head-mounted display device through the total reflection film, and in order to improve the transmittance of the light 30, the total reflection surface 130 is provided with an antireflection film, so as to improve the transmittance of the light 30.
In the technical solution provided in this embodiment, the light ray 30 enters through the light incident surface 110 of the imaging lens 10, the light ray 30 satisfies the total reflection condition of light at the total reflection surface 130, the incident angle is greater than or equal to the critical angle of total reflection, and the light ray 30 propagates from the optically dense medium to the optically sparse medium. Therefore, the light 30 is totally reflected, and the light 30 exits through the light exit surface 120 of the imaging lens 10, and displays an image at the position of the human eye 60. Because the light incident surface 110 and the light emitting surface 120 form an included angle, the direction of the light 30 emitted to the imaging lens 10 can be flexibly adjusted, and other optical devices such as a light source can be arranged on one side of the light incident surface 110 of the imaging lens 10, thereby reducing the number of optical devices arranged right in front of the human eye 60. Through the dispersed arrangement of the optical devices, the head-mounted display device is more concise, the whole overstaffed is avoided, and the head-mounted display device is convenient for a user to wear.
In the above embodiment, in order to ensure that the images are converged at the position of the human eye 60, the light emitting surface 120 of the imaging lens 10 is convex, and the convex direction of the light emitting surface 120 of the imaging lens 10 faces the light emitting direction of the imaging lens 10. With the convex arrangement, when the light 30 passes through the light emitting surface 120 of the imaging lens 10, the light 30 is deflected toward the optical axis direction, and the light 30 converges at the position of the human eye 60. By convex convergence, the light rays 30 are guaranteed to be focused at the position of the human eye 60.
In the above embodiment, the section of the center of the light incident surface 110 of the imaging lens 10 is a first section, the section of the center of the light emitting surface 120 of the imaging lens 10 is a second section, and the extending directions of the first section and the second section are orthogonal. Thus, the light ray 30 entering the light incident surface 110 of the imaging lens 10 is orthogonal to the extending direction of the light ray 30 exiting the light emitting surface 120 of the imaging lens 10. At this time, the optical devices are disposed at one side of the light incident surface 110 of the imaging lens 10, that is, the optical devices are distributed at both sides of the human eye 60. The structure of the head-mounted display device comprises the positions of the temples, and the optical devices can be arranged at the positions of the temples through the two side edges of the human eyes 60 distributed by the optical devices, so that the positions in front of the human eyes 60 can be saved, and the spaces of the temples can be fully utilized.
During propagation of the light ray 30, the light ray 30 at the edge of the lens is far from the optical axis. The optical path of the light ray 30 is different between the position near the optical axis and the position away from the optical axis, and thus it is easy to generate aberrations including spherical aberration, chromatic aberration, distortion, and the like. In order to reduce the generation of aberration, at least one of the light incident surface of the imaging lens 10 and the light emitting surface of the imaging lens 10 is aspheric. By the aspheric design, the curvature radii of the light incident surface of the imaging lens 10 and the light emitting surface of the imaging lens 10 gradually change from the center position to the edge position, for example, gradually increase or gradually decrease. The focus position of the light 30 at the edge position is adjusted by gradually changing the curvature radius, thereby reducing the generation of aberration.
In the above embodiment, in order to converge the light ray 30 at the position of the human eye 60, the imaging lens 10 is a positive lens, ensuring the converging effect of the light ray 30. The focal power of the imaging lens 10 is
Then:
the focal power is the reciprocal of the focal length, and the focal power of the imaging lens 10 is
Between 0.01 and 0.03, the light 30 is ensured to complete convergence through the imaging lens 10.
In the above embodiment, in order to further reduce the generation of aberration. The imaging optical path further includes a correcting lens group 20, and the correcting lens group 20 is disposed on one side of the light incident surface of the imaging lens 10. The collimating lens assembly 20 is used to collimate the focal position of the light beam 30 to ensure that the light beam 30 is imaged clearly at the position of the human eye 60. The generation of aberration such as spherical aberration, chromatic aberration and distortion is reduced.
Specifically, the correcting lens group 20 includes a first lens element 210, a second lens element 220 and a third lens element 230, the first lens element 210, the second lens element 220 and the third lens element 230 are sequentially disposed along the propagation direction of the light ray 30, the first lens element 210 is a positive lens element, the second lens element 220 is a negative lens element, and the third lens element 230 is a positive lens element. By the alternate arrangement of the positive lens, the negative lens and the positive lens, the light ray 30 is converged, diverged and then converged, and the optical path difference between the light ray 30 near the optical axis and the light ray 30 far away from the optical axis is corrected, so that the light ray 30 is focused and imaged at the position of the human eye 60.
Further, at least one of the light incident surface of the first lens 210, the light emitting surface of the first lens 210, the light incident surface of the second lens 220, the light emitting surface of the second lens 220, the light incident surface of the third lens 230, and the light emitting surface of the third lens 230 is aspheric. By the aspheric design, the curvature radii of the light incident surface of the first lens 210, the light emitting surface of the first lens 210, the light incident surface of the second lens 220, the light emitting surface of the second lens 220, the light incident surface of the third lens 230, and the light emitting surface of the third lens 230 gradually change from the center position to the edge position, for example, gradually increase, or gradually decrease. The focus position of the light 30 at the edge position is adjusted by gradually changing the curvature radius, thereby reducing the generation of aberration. In this embodiment, the aspheric surface may be provided on a plurality of surfaces, and may be provided on only one surface of each lens or on both surfaces of each lens. The larger the number of aspherical surface settings, the more flexible the adjustment of the aberration. Of course, the aspheric surface has a complex surface shape, and the more complex the surface shape, the higher the processing cost, so that the effect of eliminating aberration can be ensured and the processing cost can be reduced under the condition of arranging a small number of aspheric surfaces.
In the above embodiment, the first lens 210 has an optical power of
The second lens 220 has an optical power of
The third lens 230 has an optical power of
Then:
thus, the power ranges of the first lens 210, the second lens 220, and the third lens 230, the power of the first lens 210, are defined
Between 0.05 and 0.10, the second lens 220 has an optical power of
The power of the third lens 230 is between-0.15 and-0.10
Between 0.04 and 0.10, the powers of the three first, second and third lenses 210, 220 and 230 are selectively set and adjusted in respective corresponding ranges, so as to reduce the generation of aberration.
In addition, to further reduce the volume, the center thickness of the imaging lens 10 is T 0 The center thickness of the first lens 210 is T 1 The second lens 220 has a center thickness T 2 And the third lens 230 has a center thickness of T 3 Then, the following conditions are satisfied: 6mm<T 0 <15mm，1mm<T 1 <5mm，1mm<T 2 <5mm，2mm<T 3 <5mm; in particular, the center thickness, T, of the four lenses is defined 0 、T 1 、T 2 And T 3 And the adjustment is selected in a corresponding range, so that the thickness of the head-mounted display equipment is reduced, and the reduction of the whole volume of the head-mounted display equipment is facilitated.
In addition, in order to increase the transmittance of the light ray 30, antireflection films are disposed on the light incident surface of the first lens 210, the light emitting surface of the first lens 210, the light incident surface of the second lens 220, the light emitting surface of the second lens 220, the light incident surface of the third lens 230, the light emitting surface of the third lens 230, the light incident surface of the imaging lens 10, and the light emitting surface of the imaging lens 10, and the antireflection films can increase the transmission amount of the light ray 30. The antireflection film can be arranged by being pasted or coated. The adhesive setting is simple to operate and easy to complete. The coating film is arranged, so that the film layer is firmer, the compactness of the film layer can be improved through coating, and the wear resistance of the antireflection film is improved.
Furthermore, if the distance between the center point of the light incident surface of the imaging lens 10 and the center point of the light emitting surface of the third lens 230 is D, the following relationship is satisfied: d is more than 2mm. By limiting the distance between the light incident surface of the imaging lens 10 and the light emergent surface of the third lens 230, the third lens 230 is prevented from being abutted against the imaging lens 10, and the collision friction between the two lenses is reduced, so that the surfaces of the two lenses are protected. Similarly, the first lens 210, the second lens 220 and the third lens 230 are spaced apart to protect the surfaces of the lenses.
In the above embodiment, the imaging optical path further includes the display 40 and the protection plate 50 disposed on the light emergent surface of the display 40. The transparent protection plate 50 is disposed on the light emitting surface of the display 40, so as to protect the light emitting surface of the display 40 while ensuring smooth exit of the light 30, and prevent the light emitting surface of the display 40 from being damaged due to external force.
In the above embodiment, the refractive indices of the first lens 210, the second lens 220, the third lens 230, and the imaging lens 10 are n, and satisfy: 1.45-n-woven fabric(s) is (are) 1.60; and the dispersion coefficient is v, the following requirements are met: 50 were woven v-woven over 75. The refractive index is between 1.45 and 1.60, and the dispersion coefficient is between 50 and 75, so that smooth imaging of the light 30 can be ensured.
In an embodiment of the present application, a material of the first lens element may be K26R, a material of the second lens element may be EP7000, a material of the third lens element may be K26R, and a material of the imaging lens element may be K26R. The surface type of the aspheric surface is calculated by a formula, specifically, the even aspheric surface is one of the aspheric surfaces, and the calculation surface formula of the even aspheric surface mainly adopts the even aspheric surface coefficient. Specifically, the formula is
Where z is a coordinate along the optical axis direction, Y is a radial coordinate, C is a curvature of each optical surface on the optical axis, k is a conic coefficient (Coin Constant), α i Is an even aspheric surface of each high-order termCoefficient, 2i is The order of The aspheric coefficients (The order of The apparent Coefficient), and N is The number of points. E.g. alpha i Comprises alpha 1 、α 2 And alpha 3 . The specific parameters of the even aspheric surface are described in the first reference table.
Watch 1
FIG. 3 is a Modulation Transfer Function (MTF) diagram of an imaging optical path according to the present invention, where the MTF diagram is used to refer to a relationship between a Modulation degree and a logarithm of each millimeter line in an image, and is used to evaluate a detail reduction capability of a scene; wherein the uppermost black solid line is a curve theoretically having no aberration, and the closer to the black solid line, the better the imaging quality.
FIG. 4 is a dot diagram of an imaging optical path according to the present invention, wherein the dot diagram means that after a plurality of light beams emitted from a point pass through the imaging optical path, the intersection points with the image plane are no longer concentrated on the same point due to aberration, and a diffusion pattern scattered in a certain range is formed for evaluating the imaging quality of the projection optical system. The smaller the root mean square radius value and the geometric radius value, the better the imaging quality. The arrangement of the regions 1-10 is from left to right and from top to bottom. In the 7 th zone, the rms radius value is seen to be 6.254mm, and the geometric radius value 18.826mm.
FIG. 5 is a field curvature and distortion diagram of the imaging optical path of the present invention, wherein the field curvature is the field curvature, and is mainly used to indicate the misalignment degree between the intersection point of the whole light beam and the ideal image point in the imaging optical path. The distortion refers to the aberration of different magnifications of different parts of an object when the object is imaged through an imaging optical path, and the distortion can cause the similarity of the object image to be deteriorated without influencing the definition of the image.
Fig. 6 is a chromatic aberration diagram of an imaging optical path of the present invention, in which a vertical axis chromatic aberration is also called a magnification chromatic aberration, and mainly refers to a polychromatic main ray of an object side, which is converted into a plurality of rays when the object side exits due to chromatic dispersion of a refraction system.
Fig. 7 is a relative illuminance diagram of the imaging optical path of the present invention, and an illuminance value measured in one viewing angle direction reflects the brightness of the imaging optical path, and generally has high central brightness and low peripheral brightness.
The invention also provides a head-mounted display device, which comprises a shell and the imaging optical path as above, wherein the imaging optical path is arranged on the shell. The optical lens can be arranged in the shell, and can also be wrapped in a half-package mode. The imaging light path is prevented from being damaged by external force through the protection of the shell, and the dustproof and waterproof effects can also be achieved.
For the specific implementation of the head-mounted display device of the present invention, reference may be made to the above embodiments of the imaging optical path, which are not described herein again.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. An imaging optical path, comprising:
the imaging lens is provided with a light inlet surface and a light outlet surface, the light inlet surface and the light outlet surface form an included angle, and the imaging lens is also provided with a total reflection surface which is connected with the light inlet surface of the imaging lens and the light outlet surface of the imaging lens; and
the correcting lens group is arranged on one side of the light inlet surface of the imaging lens, light rays are emitted to the imaging lens through the correcting lens group, the light rays are emitted through the light inlet surface of the imaging lens, the incident angle of the light rays on the total reflection surface is larger than or equal to the critical angle of total reflection, and the light rays are reflected to the light outlet surface and are transmitted to the light outlet surface;
the correcting lens group comprises a first lens, a second lens and a third lens, the first lens, the second lens and the third lens are sequentially arranged along the propagation direction of light rays, the first lens is a positive lens, the second lens is a negative lens, and the third lens is a positive lens; the distance between the center point of the light incident surface of the imaging lens and the center point of the light emergent surface of the third lens is D, and the following conditions are met: d is more than 2mm; the first lens, the second lens, the third lens and the imaging lens have an abbe number v, and satisfy: v is more than 50 and less than 75.
2. The optical path as claimed in claim 1, wherein the light-emitting surface of the imaging lens is convex, and the convex direction of the light-emitting surface of the imaging lens faces the light-emitting direction of the imaging lens.
3. The imaging optical path of claim 2, wherein the tangent plane at the center of the light incident surface of the imaging lens is a first tangent plane, the tangent plane at the center of the light emergent surface of the imaging lens is a second tangent plane, and the extending directions of the first tangent plane and the second tangent plane are orthogonal.
4. The imaging optical path of claim 1, wherein at least one of the light incident surface of the imaging lens and the light emitting surface of the imaging lens is aspheric.
5. The imaging optical path of claim 1 wherein the imaging lens has an optical power of
Then:
6. the imaging optical path of claim 1, wherein at least one of the light incident surface of the first lens, the light emergent surface of the first lens, the light incident surface of the second lens, the light emergent surface of the second lens, the light incident surface of the third lens, and the light emergent surface of the third lens is aspheric.
7. The imaging optical path of claim 1, wherein the first lens has an optical power of
The second lens has an optical power of
The focal power of the third lens is
Then:
the center thickness of the imaging lens is T 0 The center thickness of the first lens is T 1 The center thickness of the second lens is T 2 The center thickness of the third lens is T 3 Then, the following are satisfied: t is more than 6mm 0 ＜15mm，1mm＜T 1 ＜5mm，1mm＜T 2 ＜5mm，2mm＜T 3 ＜5mm。
8. A head-mounted display device comprising a housing and the imaging optical path of any of claims 1 to 7, the imaging optical path being provided in the housing.
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| TWI519818B (en) * | 2014-05-28 | 2016-02-01 | 中強光電股份有限公司 | Optical lens and virtual image display module |
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| CN105527712B (en) * | 2016-01-26 | 2018-07-03 | 深圳市谛源光科有限公司 | A kind of novel optical system for virtual reality device |
| EP3757658B1 (en) * | 2019-06-26 | 2023-02-22 | Coretronic Corporation | Optical lens and head-mounted display device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211506055U (en) * | 2020-03-26 | 2020-09-15 | 歌尔股份有限公司 | Optical assembly and head-mounted display device |
| CN211506056U (en) * | 2020-03-26 | 2020-09-15 | 歌尔股份有限公司 | Optical assembly and head-mounted display device |
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Effective date of registration: 20221130 Address after: 261031 workshop 1, phase III, Geer Photoelectric Industrial Park, 3999 Huixian Road, Yongchun community, Qingchi street, high tech Zone, Weifang City, Shandong Province Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 No. 268 Dongfang Road, hi tech Industrial Development Zone, Shandong, Weifang Patentee before: GOERTEK Inc. |
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