CN218896252U - Optical imaging module applied to near-eye display system - Google Patents
Optical imaging module applied to near-eye display system Download PDFInfo
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- CN218896252U CN218896252U CN202223572548.2U CN202223572548U CN218896252U CN 218896252 U CN218896252 U CN 218896252U CN 202223572548 U CN202223572548 U CN 202223572548U CN 218896252 U CN218896252 U CN 218896252U
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Abstract
The utility model discloses an optical imaging module applied to a near-eye display system, which comprises a display unit and a lens group, wherein the lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from the eye side to the display unit, and the first lens and the second lens and the third lens are connected in a gluing way to form an integral lens group. The lens of the utility model is glued in the middle by using an injection molding mode, so that the integral optical lens group can reduce the weight and the influence of double refraction on the basis of meeting the light path folding structure, and is more convenient to assemble and reduces the total system length of the near-eye optical imaging system. Optical indexes such as large field angle, high definition, low chromatic aberration, low field curvature, low astigmatism, low birefringence, overall mass reduction and the like are realized. The cemented lens assembly also greatly reduces assembly errors and dimensional tolerances.
Description
Technical Field
The utility model belongs to the technical field of optical devices, and particularly relates to an optical imaging module applied to a near-eye display system.
Background
Virtual Reality (VR) display technology is a brand new optical display technology developed in recent years, and there is a great demand for Virtual Reality (VR) devices in the fields of education, medical treatment, military, consumption, and the like. The basic implementation mode is that the computer simulates the virtual environment so as to give people the sense of immersion in visual sense, auditory sense, touch sense and the like. VR display devices, typically built-in display screens, image display content to a user through a near-eye optical imaging system to form a VR image. Factors such as imaging quality, volume, field angle and the like of the near-eye display device directly influence user experience of the near-eye display device
The optical imaging module is an important component in VR equipment, plays a decisive role in the angle of view and imaging effect of the VR equipment, and meanwhile, the size of the optical imaging module also determines the volume of the VR equipment. In the existing VR equipment, optical imaging modules are mostly of Fresnel lens type or multi-lens refraction type, the size of the modules is large, the whole size is large, moreover, the chromatic aberration of the Fresnel lens type modules is serious, and the definition of the two-lens or three-lens refraction type modules is poor and the chromatic aberration is serious. The increased number of lenses introduces additional assembly tolerances.
In the prior art, the virtual reality display device adopts a Fresnel lens or a multi-lens refraction and reflection path structure, and the multi-lens refraction and reflection path structure is lighter and thinner compared with the Fresnel lens scheme, can also improve the problems of blurred vision edges, picture distortion, edge glare and the like, and brings more excellent visual effects to users. However, in order to meet the optical path structure requirement, at least two lenses are used, and the increase of lens materials can cause the increase of lens birefringence to affect the final optical phase difference, so that the weight is reduced and the lenses are increased to ensure that better field angle requirements and dispersion requirements can be achieved while the optical design is met. A special structure is therefore required to meet the design requirements of two or more-piece foldback optical path systems.
Disclosure of Invention
The utility model solves the technical problems that: the optical imaging module is applied to a near-to-eye display system, and the optical imaging module is used for reducing the influence of weight and double refraction on the basis of meeting the light path folding structure.
The technical scheme is as follows: in order to solve the technical problems, the utility model adopts the following technical scheme:
the optical imaging module comprises a display unit and a lens group, wherein the lens group comprises a first lens, a second lens and a third lens which are sequentially arranged from the eye side to the display unit, and the first lens and the second lens and the third lens are connected through gluing to form an integral lens group.
Preferably, a glue layer formed by injecting glue with refractive index close to that of air is arranged between the first lens and the second lens and between the second lens and the third lens.
Preferably, the first lens, the second lens and the third lens are all aspherical lenses.
Preferably, a polarization absorption film, a polarization reflection film and a 1/4 wave plate are sequentially arranged on one side of the first lens 1 facing the display unit.
Preferably, the two working surfaces of the first lens are convex near the human eye, and the surface of one side facing the display unit is a plane; the two working surfaces of the second lens are plane near the human eye side, and the other working surface is convex; the side of the third lens close to the human eye is a plane, and the other side is a convex surface.
Preferably, the first lens has positive optical power, the second lens has negative optical power, and the third lens has negative optical power.
Preferably, a light splitting film is disposed on one side of the third lens facing the display unit, and the light splitting efficiency of the light splitting film satisfies the following conditions:
0.1≤|Rf/Rt|≤1
wherein Rf is the reflectance of the spectroscopic film and Rt is the transmittance of the spectroscopic film.
Preferably, the display unit includes a display, which is an organic light emitting diode or an LCD display.
Preferably, a phase retarder and a polarization absorbing film are provided on the light-emitting side of the LCD display.
The beneficial effects are that: compared with the prior art, the utility model has the following advantages:
the utility model sets the lens group on the light-emitting side of the display unit through a special gluing injection molding process, the lens group comprises the first lens, the second lens and the third lens which are sequentially arranged from the eye side to the display unit, glue is filled between the first lens and the second lens through glue and is glued in an injection molding mode, and the second lens and the third lens are glued in an injection molding mode, so that the whole optical lens group can reduce the weight and the influence of double refraction on the basis of meeting the light path folding structure, and is more convenient to assemble and reduce the total length of a system of the near-eye optical imaging system. Optical indexes such as large field angle, high definition, low chromatic aberration, low field curvature, low astigmatism, low birefringence, overall mass reduction and the like are realized. The cemented lens assembly also greatly reduces assembly errors and dimensional tolerances.
Drawings
Fig. 1 is a schematic diagram of an optical imaging module applied to a near-eye display system.
Fig. 2 is an imaging optical path diagram of an imaging module of a near-eye optical imaging system.
Fig. 3 is a schematic view of a lens barrel.
Detailed Description
The utility model will be further illustrated with reference to specific examples, which are carried out on the basis of the technical solutions of the utility model, it being understood that these examples are only intended to illustrate the utility model and are not intended to limit the scope thereof.
As shown in fig. 1, the optical imaging module applied to the near-eye display system of the present utility model comprises a display unit 4, a lens group, at least one absorption polarizer, at least one reflection polarizer, and at least one 1/4 wave plate. The lens group includes at least three lenses including a first lens 1, a second lens 2, and a third lens 3, which are sequentially disposed from the eye side to the display unit 4. The first lens 1 and the second lens 2, and the second lens 2 and the third lens 3 are bonded together to form a lens group in an integral form. Between the first lens 1 and the second lens 2, and between the second lens 2 and the third lens 3 is a glue layer 5 formed by injecting glue with a refractive index close to that of air.
The first lens 1 and the third lens 3 are plastic lenses made of plastic materials, the plastic materials are transparent plastic materials PMMA (acrylic) or transparent PC materials commonly used for lenses, the second lens 2 is formed by injection molding of a cured glue material, in the embodiment, the material of the second lens 2 is a special cured glue material with the model KE-2061-80A/B of Japanese Xinyue chemical adhesive, the material is the existing commercial material, and the color before curing and after curing is transparent. The density after curing was 1.07 (23 ℃ C.), the hardness was 80 (Durometer A), the tensile strength was 11.4MPa, and the light transmittance was 95% (2 mm). The first lens 1 and the third lens 3 are fixed by black UV curing glue when assembled, and the transmittance of the black UV curing glue is not higher than 1% in the range of 400nm to 800 nm.
The second lens 2 is injection molded from a special glue material using a first set of molds. After the special glue material is solidified, a second set of mould is used for secondary injection molding, a first lens 1 and a second lens 2 are sequentially placed on the movable side and the fixed side of the mould, glue with refractive index close to that of air is injected between the first lens 1 and the second lens 2 for secondary injection molding, and at the moment, the first lens 1 and the second lens 2 become a cemented lens. And then, a third set of molds is used again for carrying out third injection molding, in the third injection molding process, a cementing lens (formed by fixing a first lens 1 and a second lens 2) and a third lens 3 are sequentially arranged on the movable side and the fixed side of the molds, and then glue with refractive index close to that of air is injected between the cementing lens and the third lens 3 for carrying out injection molding again. After the injection molding is finished, the first lens 1, the second lens 2 and the third lens 3 form a lens group without air gaps.
The first lens 1, the second lens 2 and the third lens 3 are all aspheric lenses; in order to satisfy the aspherical structure of the second lens 2, the edges (outside the optically effective area) of the first lens 1 and the second lens 2 are spaced apart according to the design of the surface aspherical coefficient of the second lens 2, and the edges (outside the optically effective area) of the second lens 2 and the third lens 3 are spaced apart according to the design of the surface aspherical coefficient of the second lens 2. As shown in fig. 3, the lens barrel structure is only required to be in interference fit with the edge shape of the lens, and the lens group is arranged in the lens barrel when in use.
The first lens 1 has positive optical power, the second lens 2 has negative optical power, and the third lens 3 has negative optical power.
The two working surfaces of the first lens 1 are convex on the side close to the human eye, the surface facing the display unit 4 is a plane, and a polarization absorbing film 11, a polarization reflecting film 12, and a 1/4 wave plate 13 are sequentially disposed from the first lens 1 toward the display unit 4. The two working surfaces of the second lens 2 are plane near the human eye side, and the other working surface is convex; the side of the third lens 3 close to the human eye is a plane, and the other is a convex surface.
The third lens 3 has a light-splitting film 31 provided on one side facing the display unit 4, and the light-splitting efficiency of the light-splitting film 31 satisfies the following condition:
0.1≤|Rf/Rt|≤1
wherein Rf is the reflectance of the spectroscopic film, and Rt is the transmittance of the spectroscopic film;
the densities of the first lens 1, the second lens 2, and the third lens 3 satisfy the following conditions: ρ2 < ρ1, ρ2 < ρ3; where ρ1 is the density of the first lens 1, ρ2 is the density of the first lens 1, and ρ3 is the density of the first lens 1.
The refractive indexes of the first lens 1, the second lens 2 and the third lens 3 satisfy the following conditions: nd1 is less than 1.6 and less than Nd2, and Nd3 is less than 1.6 and less than Nd2; wherein Nd1 is the refractive index of the first lens 1, nd2 is the refractive index of the second lens 2, and Nd3 is the refractive index of the third lens 3.
The near-eye optical imaging system satisfies the following conditional expression: the dispersion coefficient Vm of the first lens 1, the second lens 2, and the third lens 3 satisfies 40 < Vm < 60.
The near-eye optical imaging system satisfies the following conditional expression: the total effective focal length f and the entrance pupil diameter EPD of the near-eye optical imaging system meet the requirement that f/EPD is more than 2;
the effective focal length of the near-eye optical imaging system satisfies the following conditional expression: 0.1 < |f/f2|+|f/f3| < 0.8. Wherein f is the total effective focal length of the near-eye optical imaging system, f2 is the effective focal length of the second lens 2, and f3 is the effective focal length of the third lens 3.
The display unit 4 includes a display, or the display unit 4 includes a display, a polarization absorbing film, and a phase retarder, wherein the polarization absorbing film and the phase retarder are on the light-emitting side of the display; the display unit 4 may include a display 41, and the display 41 may be an Organic Light-Emitting Diode (OLED) display or a liquid crystal display (Liquid CrystalDisplay, LCD).
For an OLED display, since the OLED display is self-luminous, and does not need a phase retarder, the emitted light may directly enter the lens group, and the display unit 4 may include only the display 41. Referring to fig. 1, in the LCD display, the light emitted from the LCD display is linearly polarized, a phase retarder 42 and a polarization absorbing film 43 are disposed on the light emitting side of the display 41, the linearly polarized light emitted from the display 4 is converted into circularly polarized light by the phase retarder 42, and the converted circularly polarized light enters a lens group; that is, when the display 4 is an LCD display, the display unit 41 may include the display 4 and the phase retarder 42 and the polarization absorbing film 43 attached to the light emitting side of the display 4.
The utility model utilizes the polarization of light to realize the light path folding structure of the lens group, reduces the volume of the optical imaging module, reduces the volume of VR equipment, ensures that the VR equipment has a larger angle of view, improves the imaging quality of the VR equipment, such as improving imaging definition, reducing chromatic aberration and the like. The utility model can flexibly apply the molding process according to different optical design schemes of the multi-lens refraction and reflection path structure during assembly, thus achieving better weight reduction and optical design requirements. The weight of the optical imaging system can be reduced, the structure is optimized, and the technical indexes such as high definition, low chromatic aberration, large field angle and the like are realized while the light and thin requirements of the virtual reality equipment are ensured.
It should be noted that, although only the preferred embodiments of the present utility model have been described, it will be apparent to those skilled in the art that several modifications and adaptations of the utility model can be made without departing from the principle of the utility model, and the modifications and adaptations should and are intended to be comprehended by the scope of the utility model.
Claims (7)
1. An optical imaging module applied to a near-eye display system is characterized in that: the display device comprises a display unit and a lens group, wherein the lens group comprises a first lens (1), a second lens (2) and a third lens (3) which are sequentially arranged from the eye side to the display unit, and the first lens (1) and the second lens (2) are connected with each other and the second lens (2) and the third lens (3) are connected with each other in a gluing way to form an integral type lens group; a glue layer formed by injecting glue with refractive index close to that of air is arranged between the first lens (1) and the second lens (2) and between the second lens (2) and the third lens (3); a polarization absorption film (11), a polarization reflection film (12) and a 1/4 wave plate (13) are sequentially arranged on one side, facing the display unit (4), of the first lens (1).
2. The optical imaging module applied to a near-eye display system according to claim 1, wherein: the first lens (1), the second lens (2) and the third lens (3) are all aspheric lenses.
3. The optical imaging module applied to a near-eye display system according to claim 1, wherein: the two working surfaces of the first lens (1) close to the human eye are convex surfaces, and the surface of one side facing the display unit is a plane; the two working surfaces of the second lens (2) are plane near the human eye side, and the other working surface is convex; the side of the third lens (3) close to the human eye is a plane, and the other side is a convex surface.
4. The optical imaging module applied to a near-eye display system according to claim 1, wherein: the first lens (1) has positive optical power, the second lens (2) has negative optical power, and the third lens (3) has negative optical power.
5. The optical imaging module applied to a near-eye display system according to claim 1, wherein: one side of the third lens (3) facing the display unit (4) is provided with a light splitting film, and the light splitting efficiency of the light splitting film meets the following conditions:
0.1≤|Rf/Rt|≤1
wherein Rf is the reflectance of the spectroscopic film and Rt is the transmittance of the spectroscopic film.
6. The optical imaging module applied to a near-eye display system according to claim 1, wherein: the display unit (4) comprises a display, which is an organic light emitting diode or an LCD display.
7. The optical imaging module applied to a near-eye display system of claim 6, wherein: a phase retarder and a polarization absorbing film are disposed on a light-emitting side of the LCD display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223572548.2U CN218896252U (en) | 2022-12-29 | 2022-12-29 | Optical imaging module applied to near-eye display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223572548.2U CN218896252U (en) | 2022-12-29 | 2022-12-29 | Optical imaging module applied to near-eye display system |
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| Publication Number | Publication Date |
|---|---|
| CN218896252U true CN218896252U (en) | 2023-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223572548.2U Active CN218896252U (en) | 2022-12-29 | 2022-12-29 | Optical imaging module applied to near-eye display system |
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| Country | Link |
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