CN211506055U - Optical assembly and head-mounted display device - Google Patents
Optical assembly and head-mounted display device Download PDFInfo
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- CN211506055U CN211506055U CN202020411691.5U CN202020411691U CN211506055U CN 211506055 U CN211506055 U CN 211506055U CN 202020411691 U CN202020411691 U CN 202020411691U CN 211506055 U CN211506055 U CN 211506055U
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Abstract
The utility model discloses an optical assembly and head-mounted display device is applied to wearable equipment, and optical assembly includes: the imaging device comprises a light source, a first reflector, a semi-reflecting and semi-transmitting mirror and a second reflector, wherein the light source emits imaging light beams; the first reflector is arranged in the emergent direction of the imaging light beam and reflects the imaging light beam; the semi-reflecting and semi-transmitting mirror is arranged in a light path of the imaging light beam reflected by the first reflecting mirror; after the imaging light beam passes through the semi-reflecting and semi-transmitting lens, part of the imaging light beam irradiates the second reflecting lens, and after the part of the imaging light beam is reflected by the second reflecting lens, the part of the imaging light beam irradiates the semi-reflecting and semi-transmitting lens again and is transmitted through the semi-reflecting and semi-transmitting lens; the calibration lens is arranged in a light path of one side of the semi-reflecting and semi-transmitting mirror, which is away from the second reflecting mirror, and the second imaging light beam transmitted by the semi-reflecting and semi-transmitting mirror is displayed to be imaged through the calibration lens. The technical scheme of the utility model can effectively reduce the appearance of aberration, make the image clearer, guarantee the imaging quality.
Description
Technical Field
The utility model relates to a wearable electronic product technical field especially relates to an optical assembly and head-mounted display system.
Background
With the development of wearable electronic technology, products in many fields are gradually developing toward miniaturization. In the related art, in AR (Augmented Reality) display, external light is generally required to enter the inside of a display device, and the external light is likely to generate aberration after entering the display device, so that an image seen by human eyes is unclear.
The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.
SUMMERY OF THE UTILITY MODEL
Based on this, aiming at the problem that the current optical system is easy to generate aberration, which causes the image seen by human eyes to be unclear, it is necessary to provide an optical assembly and a head-mounted display device, which aim to effectively reduce the aberration when external light enters the interior of the display device, so that the image is clearer and the imaging quality is ensured.
In order to achieve the above object, the present invention provides an optical assembly applied to a wearable device, the optical assembly includes:
a light source that emits an imaging light beam;
the first reflector is arranged in the emergent direction of the imaging light beam and reflects the imaging light beam;
the semi-reflecting and semi-transmitting mirror is arranged in a light path of the imaging light beam reflected by the first reflecting mirror;
the second reflector is used for emitting part of the imaging light beam to the second reflector after the imaging light beam passes through the semi-reflective and semi-transparent reflector, and emitting part of the imaging light beam to the semi-reflective and semi-transparent reflector again after being reflected by the second reflector and transmitting the imaging light beam to the semi-reflective and semi-transparent reflector;
and the calibration lens is arranged in a light path at one side of the second reflector, and the imaging light beam transmitted through the transflective lens is imaged through the calibration lens.
Optionally, the reflecting surface of the first reflecting mirror is a plane, and the reflecting surface of the second reflecting mirror is an aspheric surface.
Optionally, the focal length of the second mirror is f1, the focal length of the optical assembly is f, then,
1＜|f1/f|＜2。
optionally, the optical assembly further includes an aberration eliminating mirror group disposed in an optical path between the first reflecting mirror and the semi-reflecting and semi-transmitting mirror.
Optionally, the aberration eliminating mirror group includes a biconvex positive lens and a concave-convex negative lens sequentially arranged along the propagation direction of the imaging light beam, a convex surface of the concave-convex negative lens faces the biconvex positive lens, and a concave surface of the concave-convex negative lens faces away from the biconvex positive lens.
Optionally, the focal length of the biconvex positive lens is f2, the focal length of the concavo-convex negative lens is f3, and the focal length of the optical assembly is f, then 0.5 < | f2/f | < 0.98, and 10 < | f3/f | < 20.
Optionally, a distance between the light source and the first reflector ranges from 2mm to 8mm, a distance between the first reflector and the double-convex positive lens ranges from 0.5mm to 2mm, a distance between the double-convex positive lens and the concave-convex negative lens ranges from 4mm to 10mm, a distance between the concave-convex negative lens and the semi-reflective and semi-transparent lens ranges from 0.5mm to 4mm, a distance between the semi-reflective and semi-transparent lens and the second reflector ranges from 3mm to 10mm, and a distance between the collimating lens and the semi-reflective and semi-transparent lens ranges from 0.5mm to 2 mm.
Optionally, the collimating lens is a positive meniscus lens, the convex surface of the collimating lens faces the transflective lens, the concave surface of the collimating lens faces away from the transflective lens, the focal length of the collimating lens is f4, and the focal length of the optical assembly is f, so that 0 < | f4/f | < 10.
Optionally, the half mirror is movable relative to the collimating lens so that the distance between the half mirror and the collimating lens is adjustable.
Furthermore, the utility model also provides a wear display device, include: the transparent protective layer is arranged on the light emitting surface of the light source.
The utility model provides an among the technical scheme, light source transmission image beam, image beam directive first speculum, first speculum reflects image beam to the half reflection half mirror. The imaging light beam is emitted and transmitted on the surface of the half-reflecting and half-transmitting mirror, part of the light is reflected, and part of the light is transmitted. The reflected imaging light beam is reflected to the semi-reflecting and semi-transmitting mirror again under the reflection action of the second mirror, the reflection and transmission phenomena occur on the surface of the semi-reflecting and semi-transmitting mirror again, part of the imaging light beam is transmitted to the semi-reflecting and semi-transmitting mirror, a calibration lens is arranged in the light path of the imaging light beam transmitted to the semi-reflecting and semi-transmitting mirror, and the imaging light beam displays imaging after passing through the calibration lens. The collimating lens is used for collimating aberration formed when external light enters the optical assembly. Through the effect of first speculum, half reflection half mirror and second reflection in the optical assembly, the formation of image light beam is many times refraction and reflection in the optical assembly, and then has shortened optical assembly's volume, calibrates external light through collimating lens simultaneously, and then reduces the production of aberration, makes the image clearer, guarantees the imaging quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of an optical assembly according to the present invention;
FIG. 2 is a diagram of the modulation transfer function of the optical assembly of the present invention;
fig. 3 is a schematic diagram of an optical assembly according to the present invention;
fig. 4 is a graph of field curvature and distortion of the optical assembly of the present invention;
fig. 5 is an illuminance diagram of the optical assembly of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
60 | Aberration eliminating |
| 20 | |
610 | Biconvex |
| 30 | Half-reflecting and half-transmitting |
620 | Concave-convex |
| 40 | Second reflecting |
70 | Transparent |
| 50 | |
80 | Human eye |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Referring to fig. 1, in the optical assembly provided in the embodiment, the optical assembly is generally applied to wearable devices, such as AR display devices, AR display is a virtual display technology, when a user wears the AR display device, a virtual picture is provided in front of human eyes by combining an external environment of the device, and the user can feel personally on the scene. The optical assembly includes: a light source 10, the light source 10 emitting an imaging light beam 110; the first mirror 20, the half-mirror 30, the second mirror 40, and the collimating lens 50 are sequentially disposed in the exit direction of the imaging light beam 110. There are various ways in which the Light source 10 emits Light, such as LCOS (liquid crystal on Silicon) display, DLP (Digital Light Processing) display, and the like.
The first reflector 20 is arranged in the emergent direction of the imaging light beam, and the first reflector 20 reflects the imaging light beam; the thickness of the first mirror 20 is greater than 0.1 mm. The first reflector 20 is used for changing the propagation direction of the imaging beam 110, and a total reflection film is disposed on the reflection surface of the first reflector 2020, and may be a layer of total reflection film attached or a film coated manner. The pasting mode is simpler, more convenient and faster, the film coating mode is thinner, and the film coating mode is firmer.
The half-reflecting and half-transmitting mirror 30 is arranged in the light path of the imaging light beam reflected by the first reflecting mirror 20; after the imaging light beam passes through the half-reflecting and half-transmitting mirror 30, part of the imaging light beam irradiates the second reflecting mirror 40, and part of the imaging light beam irradiates the half-reflecting and half-transmitting mirror 30 again after being reflected by the second reflecting mirror 40 and transmits through the half-reflecting and half-transmitting mirror 30. Specifically, the transflective mirror 30 can reflect and transmit light rays emitted to the surface of the transflective mirror. Generally, the transflective mirror 30 has a flat surface, and a transflective film is disposed on the flat surface of the transflective mirror 30, and the transflective film can be attached to the surface of the transflective mirror 30, or plated in a plating manner. When reflection and transmission occur, the ratio of transmission to reflection is generally in one-to-one, although the ratio of transmission to reflection may be adjusted as desired.
The collimating lens 50 is disposed in the optical path of the half mirror 30 at the side away from the second reflecting mirror 40, and the imaging light beam transmitted through the half mirror 30 is imaged through the collimating lens 50. The light incident surface and the light emitting surface of the collimating lens 50 are aspheric. Since the AR display device often requires the light from the external environment to be incident, a transflective film is disposed on the second reflecting mirror 40 facing the transflective mirror 30, and an anti-reflection film is disposed on the second reflecting mirror 30 facing away from the transflective mirror, so that the light from the outside of the display device can enter the inside of the display device through the second reflecting mirror 40. After the external light passes through the second reflector 40 and the half-reflecting and half-transmitting mirror 30 in sequence, the external light may generate distortion and aberration, and the distortion and aberration of the external light can be reduced or even eliminated by the correction action of the collimating lens 50, so that better display imaging can be obtained. The thickness of the collimating lens 50 ranges from 2mm to 6mm, and since both surfaces of the collimating lens 50 are aspheric, the thickness refers to the range of the thinnest position of the collimating lens 50.
Additionally, the utility model discloses also can be used in VR (Virtual Reality) demonstration, the one side towards the half reflection half mirror 30 of second mirror 40 sets up the total reflection membrane.
In the technical solution of this embodiment, the light source 10 emits an imaging light beam, the imaging light beam is emitted to the first reflector 20, and the first reflector 20 reflects the imaging light beam to the transflective mirror 30. The image light beam is emitted and transmitted on the surface of the half-reflecting and half-transmitting mirror 30, part of the light is reflected, and part of the light is transmitted. The reflected imaging light beam is reflected to the transflective mirror 30 again under the reflection action of the second reflecting mirror 40, the reflection and transmission phenomena occur again on the surface of the transflective mirror 30, part of the imaging light beam is transmitted through the transflective mirror 30, the calibration lens 50 is arranged in the light path of the imaging light beam transmitted through the transflective mirror 30, and the imaging light beam displays an image after passing through the calibration lens 50. Through the action of the first reflector 20, the semi-reflecting and semi-transmitting mirror 30 and the second reflection in the optical assembly, the imaging light beam is refracted and reflected for multiple times in the optical assembly, and the volume of the optical assembly is further shortened. Meanwhile, the external light is calibrated through the calibration lens 50, so that the generation of aberration is reduced, the image is clearer, and the imaging quality is ensured.
In one embodiment, the reflective surface of the first reflector 20 is a flat surface and the reflective surface of the second reflector 40 is an aspheric surface. The reflecting surface of the first reflector 20 and the imaging light beam form an included angle, the included angle ranges from 0 degree to 90 degrees, and the 45-degree angle can ensure that the imaging light beam realizes light path reflection on a shorter path. Both surfaces of the second reflecting mirror 40 are aspheric surfaces, which means that the radius of curvature of the lens is gradually changed from the center to the periphery, and the generated aberration is improved by the gradual change of the radius of curvature.
In one embodiment, the focal length of second mirror 40 is f1, and the focal length of the optical assembly is f, then 1 < | f1/f | < 2. Optical assembly's focus is f and refers to optical assembly's effective focal length, the surface of second mirror 40 is the aspheric surface, the aspheric surface of second mirror 40 is protruding to the half anti-semi-transparent mirror 30 one side of separating back, consequently, it can be known, second mirror 40 has the effect of convergent light, through 1 < | f1/f | < 2, the ability of the convergent light of second mirror 40 can be guaranteed to the focus f1 of injecing second mirror 40, guarantee promptly that the focus f1 of second mirror 40 and optical assembly's the absolute value of focus contrast between 1 ~ 2, make optical assembly wholly guarantee under the less condition of volume, make optical assembly have fine light convergence effect, guarantee to image clearly.
In one embodiment, the optical assembly further comprises an aberration eliminating mirror group 60, and the aberration eliminating mirror group 60 is disposed in the optical path between the first reflecting mirror 20 and the semi-reflecting and semi-transparent mirror 30. The light source 10 generates aberration during the generation of the image beam or after passing through various lenses, and the aberration eliminating mirror group 60 is used for reducing or even eliminating aberration. The aberration eliminating lens group 60 is a lens group composed of at least one lens, for example, a positive lens or a negative lens, and a combination of the positive lens and the negative lens are used, so as to eliminate the aberration by offsetting the positive and negative of the aberration, or change the curvature radius of the imaging beam by the aspherical mirror, thereby reducing the aberration.
In one embodiment, the aberration canceling lens group 60 includes a double convex positive lens 610 and a double concave negative lens 620 arranged in this order along the traveling direction of the image light beam, the convex surface of the double concave negative lens 620 faces the double convex positive lens 610, and the concave surface of the double concave negative lens 620 faces away from the double convex positive lens 610. The light incident surface and the light emergent surface of the biconvex positive lens 610 and the biconcave negative lens 620 are both aspheric surface designs, the imaging light beam is before the display imaging, the display light source 10 has a small volume, the resolving power is generally required to be improved to complete the resolving processing of the imaging light beam, and the human eyes 80 can observe clear images conveniently. In addition, in the spherical design, aberration may occur at the periphery of the image, and the image may be distorted. The light incident surface and the light emergent surface are designed to be aspheric surfaces, and the curvature radius of the lens is gradually changed from the center to the periphery, so that aberration can be improved. The thickness of the double convex positive lens 610 is 2mm to 8mm, the thickness of the concave-convex negative lens 620 is 2mm to 6mm, and the thickness is the range of the thinnest position of the double convex positive lens and the concave-convex negative lens.
Specifically, the thickness of the biconvex positive lens 610 is 7.14mm, the thickness of the concave-convex negative lens 620 is 4.81mm, the thickness of the second reflecting mirror 40 is 1mm, and the thickness of the collimating lens 50 is 2.75 mm.
In one embodiment, the focal length of the biconvex positive lens 610 is f2, the focal length of the biconcave negative lens 620 is f3, and the focal length of the optical assembly is f, then 0.5 < | f2/f | < 0.98, and 10 < | f3/f | < 20. Generally, a positive lens has the function of converging light rays, a negative lens has the function of diverging light rays, the focal length of the positive lens is a positive value, and the focal length of the negative lens is a negative value. By defining the focal length of the double convex positive lens 610 as f2 and the focal length of the double concave negative lens 620 as f3 and the absolute value of the contrast of the focal length f of the optical assembly, complete resolution of the imaging light beam can be further ensured, and aberration can be effectively reduced.
In one embodiment, the distance between the light source 10 and the first reflector 20 is in a range of 2mm to 8mm, the distance between the first reflector 20 and the double-convex positive lens 610 is in a range of 0.5mm to 2mm, the distance between the double-convex positive lens 610 and the double-concave negative lens 620 is in a range of 4mm to 10mm, the distance between the double-concave negative lens 620 and the transflective lens 30 is in a range of 0.5mm to 4mm, the distance between the transflective lens 30 and the second reflector 40 is in a range of 3mm to 10mm, and the distance between the collimating lens 50 and the transflective lens 30 is in a range of 0.5mm to 2 mm. The distance range refers to a distance range between the two. For example, the reflecting surface of the first reflector 20 and the imaging beam have an angle, i.e. the first reflector 20 is arranged obliquely with respect to the light source 10. It can be seen that the distance between the first reflector 20 and the light source 10 has a near point and a far point, and the distance between the light source 10 and the first reflector 20 is in the range of 2mm to 8mm, which means that the distance between the two points of the first reflector 20 and the light source 10 which are closest to each other in the direction of the imaging light beam propagation is in the range of 2mm to 8 mm. In addition, the surfaces of the biconvex positive lens 610 and the biconcave negative lens 620 are aspheric, and thus the distances therebetween are also divided into distances. The distance between the light source 10, the first reflector 20, the double convex positive lens 610, the double concave negative lens 620, the half-reflecting and half-transmitting mirror 30, the second reflector 40 and the collimating lens 50 can be adjusted within the above distance range, so that the imaging light beam can smoothly display the image at the position of the human eye 80.
In one embodiment, the collimating lens 50 is a positive meniscus lens, the convex surface of the collimating lens 50 faces the half mirror 30, the concave surface of the collimating lens 50 faces away from the half mirror 30, the focal length of the collimating lens 50 is f4, and the focal length of the optical assembly is f, then 0 < | f4/f | < 10. The imaged image can be made clearer by defining the absolute value of the ratio of the focal length f4 of the collimating lens 50 and the focal length f of the optical assembly.
According to the above embodiments, in the present application, the focal length f1 of the second reflecting mirror 40 is 102mm, the focal length f4 of the collimating lens 50 is 23.59mm, the focal length f2 of the biconvex positive lens 610 is 13.33mm, the focal length f3 of the biconcave negative lens 620 is 262mm, and the effective focal length f of the optical assembly is-13.6 mm.
In one embodiment, the half mirror 30 is movable relative to the collimating lens 50 such that the distance between the half mirror 30 and the collimating lens 50 is adjustable. In particular, the half mirror 30 can be moved relative to the collimating lens 50 by means of a lead screw. For example, the half mirror 30 is fixed, a lead screw is disposed between the collimating lens 50 and the half mirror 30, the collimating lens 50 moves linearly along the lead screw, and the distance between the collimating lens 50 and the half mirror is adjusted by adjusting the movement of the collimating lens 50. The collimating lens 50 can also be fixed, and the half-reflecting half-transmitting mirror 30 can move linearly along the screw rod. It is also possible that both the collimating lens 50 and the half mirror 30 can move linearly along the lead screw. By changing the distance between the half-reflecting and half-transmitting mirror 30 and the calibration lens 50, the position of the focusing of the imaging light beam can be adjusted, so that a person who is near-sighted or far-sighted can also clearly see the display image when using the corresponding optical component, and does not need to wear additional lenses. The utility model can realize the use of the myopia personnel with the myopia degree between 0 and 500 degrees. The half-reflecting and half-transmitting mirror 30 is usually at a minimum distance of 12mm from the human eye 80.
In addition, since the collimating lens 50 and the second reflecting mirror 40 are both of curved design, that is, the distance between the collimating lens 50 and the second reflecting mirror 40 has the closest point and the farthest point, it is defined that the farthest point between the collimating lens 50 and the second reflecting mirror 40 is the optical component thickness TTL, the field angle of the optical component is FOV, and tan (FOV/TTL) > 0.04, and the whole volume of the optical component is ensured to meet the set requirement by defining the field angle FOV and the optical component thickness TTL.
Fig. 2 is a modulation transfer function diagram of the optical assembly of the present invention, i.e. a Modulation Transfer Function (MTF) diagram, where the MTF diagram is used to indicate the relationship between the modulation degree and the number of line pairs per millimeter in the image, and is used to evaluate the detail reduction capability of the 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. 3 is a schematic diagram of an optical assembly according to the present invention; the point diagram refers to that after a plurality of light rays emitted by one point pass through the optical assembly, intersection points of the light rays and the image surface are not concentrated on the same point any more due to aberration, and a diffusion pattern scattered in a certain range is formed and used 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 sequence of the regions 1-9 is from left to right and from top to bottom.
Fig. 4 is a field curvature and distortion diagram of the optical assembly of the present invention, wherein the field curvature is an image 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 optical assembly. The distortion refers to the aberration of different magnifications of different parts of an object when the object is imaged through an optical component, and the distortion can cause the similarity of the object image to be deteriorated without influencing the definition of the image.
Fig. 5 is the utility model discloses optical assembly's illuminance map, the illuminance value that the measurement reachs in a visual angle direction reflects the luminance condition that optical assembly imaged, and general central luminance is high, and peripheral luminance is low.
The utility model also provides a wear display device, include: a transparent protection layer 70 and the optical assembly as described above, the transparent protection layer 70 is disposed on the light emitting surface of the light source 10. Specifically, the transparent protection layer 70 covers the light emitting surface of the light source 10, and can protect the light source 10 without affecting the light beam emission, for example, a glass protection plate is used, and the thickness of the glass protection plate is greater than 0.3 mm.
The detailed implementation of the optical assembly in this embodiment refers to the above description, and is not repeated herein.
The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.
Claims (10)
1. An optical assembly applied to a wearable device, the optical assembly comprising:
a light source that emits an imaging light beam;
the first reflector is arranged in the emergent direction of the imaging light beam and reflects the imaging light beam;
the semi-reflecting and semi-transmitting mirror is arranged in a light path of the imaging light beam reflected by the first reflecting mirror;
the second reflector is used for emitting part of the imaging light beam to the second reflector after the imaging light beam passes through the semi-reflective and semi-transparent reflector, and emitting part of the imaging light beam to the semi-reflective and semi-transparent reflector again after being reflected by the second reflector and transmitting the imaging light beam to the semi-reflective and semi-transparent reflector; and
and the calibration lens is arranged in a light path at one side of the second reflector, and the imaging light beam transmitted through the transflective lens is imaged through the calibration lens.
2. The optical assembly of claim 1 wherein the reflective surface of the first mirror is planar and the reflective surface of the second mirror is aspheric.
3. The optical assembly of claim 2, wherein the second mirror has a focal length f1, and wherein 1 < | f1/f | < 2 if the optical assembly has a focal length f.
4. The optical assembly of claim 1, further comprising a set of aberration canceling mirrors disposed in an optical path between the first mirror and the semi-reflective and semi-transparent mirror.
5. The optical assembly of claim 4, wherein the aberration-canceling lens group comprises a biconvex positive lens and a concave-convex negative lens arranged in this order along the direction of propagation of the imaging light beam, the convex surface of the concave-convex negative lens facing the biconvex positive lens, and the concave surface of the concave-convex negative lens facing away from the biconvex positive lens.
6. The optical assembly of claim 5, wherein the biconvex positive lens has a focal length f2, the meniscus negative lens has a focal length f3, and the optical assembly has a focal length f,
0.5＜|f2/f|＜0.98，10＜|f3/f|＜20。
7. the optical assembly of claim 5, wherein the light source is located at a distance from the first reflector in a range of 2mm to 8 mm;
the distance between the first reflector and the biconvex positive lens ranges from 0.5mm to 2 mm;
the distance between the biconvex positive lens and the concave-convex negative lens ranges from 4mm to 10 mm;
the distance between the concave-convex negative lens and the semi-reflecting and semi-transmitting lens ranges from 0.5mm to 4 mm;
the distance between the half-reflecting and half-transmitting mirror and the second reflecting mirror ranges from 3mm to 10 mm;
the distance between the collimating lens and the semi-reflecting and semi-transmitting lens is 0.5 mm-2 mm.
8. The optical assembly of any one of claims 1 to 7, wherein the collimating lens is a positive meniscus lens, the convex surface of the collimating lens faces the transflective mirror, the concave surface of the collimating lens faces away from the transflective mirror, the collimating lens has a focal length of f4, and the optical assembly has a focal length of f, where 0 < | f4/f | < 10.
9. An optical assembly according to any one of claims 1 to 7, wherein the distance between the light source and the first mirror is adjustable.
10. A head-mounted display device, comprising: a transparent protective layer and the optical assembly according to any one of claims 1 to 9, wherein the transparent protective layer is disposed on the light emitting surface of the light source.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219664A (en) * | 2021-04-30 | 2021-08-06 | 歌尔股份有限公司 | Imaging optical path and head-mounted display device |
| CN114690426A (en) * | 2022-03-31 | 2022-07-01 | 上海摩软通讯技术有限公司 | Optical display device |
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2020
- 2020-03-26 CN CN202020411691.5U patent/CN211506055U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219664A (en) * | 2021-04-30 | 2021-08-06 | 歌尔股份有限公司 | Imaging optical path and head-mounted display device |
| CN113219664B (en) * | 2021-04-30 | 2022-11-22 | 歌尔股份有限公司 | Imaging optical path and head-mounted display device |
| CN114690426A (en) * | 2022-03-31 | 2022-07-01 | 上海摩软通讯技术有限公司 | Optical display device |
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Effective date of registration: 20201014 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: GOERTEK Inc. |
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