CN111538200A - Optical system and projection device - Google Patents
Optical system and projection device Download PDFInfo
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- CN111538200A CN111538200A CN202010347225.XA CN202010347225A CN111538200A CN 111538200 A CN111538200 A CN 111538200A CN 202010347225 A CN202010347225 A CN 202010347225A CN 111538200 A CN111538200 A CN 111538200A
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- lens
- optical system
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- incident surface
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
Abstract
The invention discloses an optical system and a projection device, wherein the optical system sequentially comprises a display unit, a sixth lens, a fifth lens, a fourth lens, a third lens, a second lens and a first lens along a light transmission direction, wherein the first lens has negative focal power, a light-emitting surface of the first lens is of a convex structure and comprises at least one inflection point, and a light-in surface is of a concave structure; the second lens has a negative optical power, the third lens has a positive optical power, the fourth lens has a negative optical power, the fifth lens has a positive optical power, and the sixth lens has a positive optical power. The invention provides a projection lens and a projection device, and aims to solve the problems that in the prior art, the size of a projector is large, the weight of the projector is heavy, and the assembly difficulty is large due to the fact that the number of lenses of an optical system of the projector is large.
Description
Technical Field
The present invention relates to the field of projection technologies, and in particular, to an optical system and a projection apparatus.
Background
With the development of science and technology, projectors gradually develop towards the directions of small size, light weight and high portability, in order to obtain images with high contrast and high resolution, in the existing projection devices, 8 or more than 10 lenses are generally required to be combined, so that the optical performance of an optical system in the projector is improved, but when the number of lenses in projection equipment is large, the cost and the weight of the projector are high, and the assembly difficulty of the optical system of the projector is increased due to the large number of lenses.
Disclosure of Invention
The invention provides an optical system and a projection device, and aims to solve the problems that in the prior art, the size of a projector is large, the weight of the projector is heavy, and the assembly difficulty is large due to the fact that the number of lenses of the optical system of the projector is large.
In order to achieve the above object, the present invention provides an optical system including a display unit, a sixth lens, a fifth lens, a fourth lens, a third lens, a second lens, and a first lens in this order along a light transmission direction, wherein,
the first lens has negative focal power, the light emitting surface of the first lens is of a convex structure and comprises at least one inflection point, and the light incident surface is of a concave structure;
the second lens has negative focal power, the light emitting surface of the second lens is of a concave structure, and the light incident surface of the second lens is of a concave structure;
the third lens has positive focal power, the light emitting surface of the third lens is of a convex structure, and the light incident surface of the third lens is of a convex structure;
the fourth lens has negative focal power, the light emitting surface of the fourth lens is of a concave structure, and the light incident surface of the fourth lens is of a concave structure;
the fifth lens has positive focal power, the light emitting surface of the fifth lens is of a convex structure, and the light incident surface of the fifth lens is of a convex structure;
the sixth lens is provided with positive focal power, the light emergent surface of the sixth lens is of a convex structure, and the light incident surface of the sixth lens is of a convex structure.
Optionally, the optical system further satisfies the following relationship:
tan(HFOV)/TTL＞0.017；
wherein the HFOV is half of a maximum field of view of the optical system and the TTL is a total length of the optical system.
Optionally, the refractive index ranges of the first lens to the sixth lens are all greater than or equal to 1.45 and less than or equal to 1.75;
the first lens to the sixth lens each have an abbe number of 50 or more and 70 or less.
Optionally, the light incident surface and the light emitting surface of the first lens are both aspheric structures;
the light incident surface and the light emergent surface of the second lens are both of spherical structures;
the light incident surface and the light emergent surface of the third lens are both of spherical structures;
the light incident surface and the light emergent surface of the fourth lens are both of spherical structures;
the light incident surface and the light emergent surface of the fifth lens are both of spherical structures;
the light incident surface and the light emergent surface of the sixth lens are both aspheric structures.
Optionally, the first lens is made of an optical plastic material, and the second lens to the sixth lens are made of an optical glass material.
Optionally, the optical system further satisfies the following relationship:
-0.37<f/f1<-0.57；-0.39<f/f2<-0.584；0.45<f/f3<0.65；-0.47<f/f4<-0.67；0.4<f/f5<0.61；0.39<f/f6<0.59；
wherein f is an effective focal length of the optical system, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, and f6 is an effective focal length of the sixth lens.
Optionally, the optical system further satisfies the following relationship:
tele <1 °, wherein the Tele is a light exit angle of the display unit.
Optionally, the optical system further includes a splitting prism, and the splitting prism is disposed between the display unit and the sixth lens.
Optionally, the optical system further includes a diaphragm, and the diaphragm is disposed between the third lens and the fourth lens.
To achieve the above object, the present application provides a projection apparatus, which includes a housing and an optical system as described in any one of the above embodiments.
In the technical scheme provided by the application, the optical system sequentially comprises a display unit, a sixth lens, a fifth lens, a fourth lens, a third lens, a second lens and a first lens along a light transmission direction, wherein the first lens has negative focal power, a light-emitting surface of the first lens is of a convex structure and comprises at least one inflection point, and a light-in surface is of a concave structure; the second lens has positive focal power, the light emitting surface of the second lens is of a concave surface structure, and the light incident surface of the second lens is of a concave surface structure; the third lens has positive focal power, the light emitting surface of the third lens is of a convex structure, and the light incident surface of the third lens is of a convex structure; the fourth lens has negative focal power, the light emitting surface of the fourth lens is of a concave structure, and the light incident surface of the fourth lens is of a concave structure; the fifth lens has positive focal power, the light emitting surface of the fifth lens is of a convex structure, and the light incident surface of the fifth lens is of a convex structure; the sixth lens is provided with positive focal power, the light emergent surface of the sixth lens is of a convex structure, and the light incident surface of the sixth lens is of a convex structure. The light rays emitted by the display unit sequentially pass through the sixth lens and the first lens and then are projected to an imaging surface, and the light rays passing through the sixth lens and the first lens can obtain high-quality images on the imaging surface through the combined action of the first lens and the sixth lens, so that the problems that in the prior art, the number of lenses in an optical system of a projection device is large, the volume of the projection device is large, the weight is heavy, and the assembly difficulty is large are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 diagram of the construction of an optical system of the present invention;
FIG. 2 is a schematic diagram of the optical path of the optical system of the present invention;
FIG. 3 is a diagram of the modulation transfer function of a first embodiment of the optical system of the present invention;
FIG. 4 is a dot-column diagram of a first embodiment of the optical system of the present invention;
FIG. 5 is a graph of field curvature and optical distortion for a first embodiment of an optical system according to the present invention;
FIG. 6 is a relative illuminance diagram of the first embodiment of the optical system of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
60 | |
| 20 | |
70 | |
| 30 | |
80 | |
| 40 | |
90 | |
| 50 | |
100 | Cover glass |
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 clearly and completely described below 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 the directional indicators (such as up, down, 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 movement situation, etc. in a specific posture (as shown in the drawing), 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 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 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 connected internally or in any other suitable relationship, unless expressly stated otherwise. 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.
The invention provides an optical system and a projection device.
Referring to fig. 1 and 2, the optical system sequentially includes a display unit, a sixth lens, a fifth lens, a fourth lens, a third lens, a second lens, and a first lens along a light transmission direction, wherein,
the first lens has negative focal power, the light emitting surface of the first lens is of a convex structure and comprises at least one inflection point, and the light incident surface is of a concave structure;
the second lens has negative focal power, the light emitting surface of the second lens is of a concave structure, and the light incident surface of the second lens is of a concave structure;
the third lens has positive focal power, the light emitting surface of the third lens is of a convex structure, and the light incident surface of the third lens is of a convex structure;
the fourth lens has negative focal power, the light emitting surface of the fourth lens is of a concave structure, and the light incident surface of the fourth lens is of a concave structure;
the fifth lens has positive focal power, the light emitting surface of the fifth lens is of a convex structure, and the light incident surface of the fifth lens is of a convex structure;
the sixth lens is provided with positive focal power, the light emergent surface of the sixth lens is of a convex structure, and the light incident surface of the sixth lens is of a convex structure.
In the technical scheme provided by the application, the optical system sequentially comprises a display unit, a sixth lens, a fifth lens, a fourth lens, a third lens, a second lens and a first lens along a light transmission direction, wherein the first lens has negative focal power, a light-emitting surface of the first lens is of a convex structure and comprises at least one inflection point, and a light-in surface is of a concave structure; the second lens has positive focal power, the light emitting surface of the second lens is of a concave surface structure, and the light incident surface of the second lens is of a concave surface structure; the third lens has positive focal power, the light emitting surface of the third lens is of a convex structure, and the light incident surface of the third lens is of a convex structure; the fourth lens has negative focal power, the light emitting surface of the fourth lens is of a concave structure, and the light incident surface of the fourth lens is of a concave structure; the fifth lens has positive focal power, the light emitting surface of the fifth lens is of a convex structure, and the light incident surface of the fifth lens is of a convex structure; the sixth lens is provided with positive focal power, the light emergent surface of the sixth lens is of a convex structure, and the light incident surface of the sixth lens is of a convex structure. The light rays emitted by the display unit sequentially pass through the sixth lens and the first lens and then are projected to an imaging surface, and the light rays passing through the sixth lens and the first lens can obtain high-quality images on the imaging surface through the combined action of the first lens and the sixth lens, so that the problems that in the prior art, the number of lenses in an optical system of a projection device is large, the volume of the projection device is large, the weight of the projection device is heavy, and the assembly difficulty is large are solved.
In an alternative embodiment, the optical system further satisfies the following relationship:
tan(HFOV)/TTL＞0.017；
wherein the HFOV is a maximum half field of view of the optical system, and the TTL is a total length of the optical system.
In an alternative embodiment, the refractive index ranges of the first lens to the sixth lens are each greater than or equal to 1.45 and less than or equal to 1.75; specifically, the refractive index refers to the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium. The higher the refractive index of the material, the greater the ability to refract incident light.
The first lens to the sixth lens each have an abbe number of 50 or more and 70 or less. Specifically, the abbe number is an important index for measuring the imaging quality of the lens, and is generally expressed by an abbe number, and the larger the abbe number is, the less the chromatic dispersion is, and the better the imaging quality of the lens is expressed; the smaller the dispersion coefficient, the more significant the dispersion, and the poor imaging quality of the lens.
In an optional embodiment, the light incident surface and the light emitting surface of the first lens are both aspheric structures;
the light incident surface and the light emergent surface of the second lens are both of spherical structures;
the light incident surface and the light emergent surface of the third lens are both of spherical structures;
the light incident surface and the light emergent surface of the fourth lens are both of spherical structures;
the light incident surface and the light emergent surface of the fifth lens are both of spherical structures;
the light incident surface and the light emergent surface of the sixth lens are both aspheric structures.
When the surface of the lens is an aspheric structure, the edge aberration of the lens can be effectively reduced, and the performance of the optical system is improved. Through the aspheric surface structure, the effect of correcting aberration of the spherical lenses is effectively realized, and the optical system is favorably miniaturized.
In an alternative embodiment, the first lens is an optical plastic lens, and the second lens to the sixth lens are all optical glass materials. Specifically, because projection arrangement is in the course of the work, the display element can generate heat gradually, in order to avoid the heat that the display element sent influences projection optical system makes projection optical system's lens warp, and optical glass has better thermal stability for optical plastic, consequently is close to display element first mirror group and second mirror group are the optical glass material to avoid the influence of high temperature to the formation of image of other lenses, optical plastic compares in optical glass, and optical plastic has the plasticity strong, light in weight, advantage that the processing cost is low, consequently will keep away from display element eleventh lens with twelfth lens set for optical plastic material.
In an alternative embodiment, the optical system further satisfies the following relationship:
-0.37<f/f1<-0.57；-0.39<f/f2<-0.584；0.45<f/f3<0.65；-0.47<f/f4<-0.67；0.4<f/f5<0.61；0.39<f/f6<0.59；
wherein f is an effective focal length of the optical system, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, and f6 is an effective focal length of the sixth lens.
In an alternative embodiment, the optical system further satisfies the following relationship:
tele <1 °, wherein Tele is the telecentricity of the optical system. Specifically, the telecentricity refers to an angle of a principal ray in the optical system deviating from an optical axis, and the smaller the angle, the better the telecentricity, and the more accurate the imaging.
In an alternative embodiment, the optical system further includes a beam splitter prism disposed between the display unit and the sixth lens. In an embodiment, the beam splitter prism is configured to split light emitted by the display unit, wherein one light is transmitted to a subsequent lens, and the other light is transmitted to other functional modules of the projection apparatus.
In some optional embodiments, the projection optical system further includes a protective glass, wherein the protective glass is disposed between the display unit and the beam splitter prism, and is used for protecting the display unit from an impact of an external environment or other elements.
In an optional implementation manner, the optical system further includes a diaphragm, and the diaphragm is disposed between the third lens and the fourth lens, where the diaphragm refers to an optical element used for limiting a light beam in the optical system, and is mainly used for limiting a light ray or a field size of the optical system, and specifically, the diaphragm is used for limiting a light ray size entering the fourth lens from the third lens.
First embodiment
In the first embodiment, the optical system design data is as shown in table 1 below:
TABLE 1
In the first embodiment, the parameters are as follows:
the ratio f/f1 of the focal length of the optical system to the focal length of the first lens is-0.4789;
the ratio f/f2 of the focal length of the optical system to the focal length of the second lens is-0.4838;
the ratio f/f3 of the focal length of the optical system to the focal length of the third lens is 0.5558;
the ratio f/f4 of the focal length of the optical system to the focal length of the fourth lens is-0.5696;
the ratio f/f5 of the focal length of the optical system to the focal length of the fifth lens is 0.5091;
the ratio f/f6 of the focal length of the optical system to the focal length of the sixth lens is 0.4899.
The first lens and the sixth lens are aspheric, where α 4, α 6, α 8, α 10, α 12, α 14, and α 16 are aspheric high-order coefficient of the aspheric lens, as shown in table 2.
TABLE 2
Referring to fig. 3, fig. 3 is a Modulation Transfer Function (MTF) diagram of the first embodiment, wherein the MTF is a relationship between Modulation degree and a line-per-millimeter logarithm in an image for evaluating detail restoring capability of a scene. Higher values of the vertical axis of the modulation transfer function indicate higher imaging resolution. The MTF value of the first embodiment is 0.7 or more in each field.
Referring to fig. 4, fig. 4 is a dot diagram of the first embodiment, in which after a plurality of light beams emitted from a point pass through an optical system, intersection points with an 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. In the first embodiment, the maximum value of the image points in the dot array image corresponds to the maximum field of view, and the maximum value of the image points in the dot array image is less than 4.1 mm.
Referring to fig. 5, fig. 5 is a graph of field curvature and optical distortion of the first embodiment, where the field curvature is used to indicate the position change of the beam image point of different field points from the image plane, and the optical distortion is the vertical axis distance of the intersection point of the principal ray at the dominant wavelength of a certain field and the image plane from the ideal image point; in the first embodiment, the field curvature in both the tangential and sagittal planes is less than ± 0.05mm, with a maximum distortion of < 1%.
Referring to fig. 6, fig. 6 is a graph of relative illuminance of the first embodiment, wherein the relative illuminance refers to a ratio of illuminance at different coordinate points of the image plane to illuminance at a center point.
The present invention further provides a projection apparatus, where the projection apparatus includes the optical system according to any of the above embodiments, and the specific structure of the optical system refers to the above embodiments, and since the optical system adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated herein.
The above description is only a preferred embodiment of the present invention, and is 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 (10)
1. An optical system comprising, in order along a light transmission direction, a display unit, a sixth lens, a fifth lens, a fourth lens, a third lens, a second lens, and a first lens,
the first lens has negative focal power, the light emitting surface of the first lens is of a convex structure and comprises at least one inflection point, and the light incident surface is of a concave structure;
the second lens has negative focal power, the light emitting surface of the second lens is of a concave structure, and the light incident surface of the second lens is of a concave structure;
the third lens has positive focal power, the light emitting surface of the third lens is of a convex structure, and the light incident surface of the third lens is of a convex structure;
the fourth lens has negative focal power, the light emitting surface of the fourth lens is of a concave structure, and the light incident surface of the fourth lens is of a concave structure;
the fifth lens has positive focal power, the light emitting surface of the fifth lens is of a convex structure, and the light incident surface of the fifth lens is of a convex structure;
the sixth lens is provided with positive focal power, the light emergent surface of the sixth lens is of a convex structure, and the light incident surface of the sixth lens is of a convex structure.
2. The optical system of claim 1, wherein the optical system satisfies the following relationship:
tan(HFOV)/TTL＞0.017；
wherein the HFOV is a maximum half field of view of the optical system, and the TTL is a total length of the optical system.
3. The optical system of claim 1,
the refractive index ranges of the first lens to the sixth lens are all greater than or equal to 1.45 and less than or equal to 1.75;
the first lens to the sixth lens each have an abbe number of 50 or more and 70 or less.
4. The optical system of claim 1,
the light incident surface and the light emergent surface of the first lens are both aspheric structures;
the light incident surface and the light emergent surface of the second lens are both of spherical structures;
the light incident surface and the light emergent surface of the third lens are both of spherical structures;
the light incident surface and the light emergent surface of the fourth lens are both of spherical structures;
the light incident surface and the light emergent surface of the fifth lens are both of spherical structures;
the light incident surface and the light emergent surface of the sixth lens are both aspheric structures.
5. The optical system of claim 1, wherein the first lens is an optical plastic material and the second lens through the sixth lens are all optical glass materials.
6. The optical system of claim 1, wherein the optical system satisfies the following relationship:
-0.37<f/f1<-0.57；-0.39<f/f2<-0.584；0.45<f/f3<0.65；-0.47<f/f4<-0.67；0.4<f/f5<0.61；0.39<f/f6<0.59；
wherein f is an effective focal length of the optical system, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, and f6 is an effective focal length of the sixth lens.
7. The optical system of claim 1, wherein the optical system satisfies the following relationship:
tele <1 °, wherein Tele is the telecentricity of the optical system.
8. The optical system according to claim 1, further comprising a beam splitter prism, the beam splitter prism being provided between the display unit and the sixth lens.
9. The optical system of claim 1, further comprising an optical stop disposed between the third lens and the fourth lens.
10. A projection device comprising a housing and an optical system according to any one of claims 1-9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112255767A (en) * | 2020-11-06 | 2021-01-22 | 歌尔光学科技有限公司 | Projection lens and projection equipment |
| CN114047613A (en) * | 2021-10-29 | 2022-02-15 | 歌尔光学科技有限公司 | Optical system and projection device |
| CN116841008A (en) * | 2023-08-28 | 2023-10-03 | 深圳爱图仕创新科技股份有限公司 | projection lens |
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| CN102109660A (en) * | 2009-12-25 | 2011-06-29 | 佛山普立华科技有限公司 | Image-capturing lens |
| US20170038564A1 (en) * | 2015-08-04 | 2017-02-09 | Coretronic Corporation | Projection display apparatus and projection lens module thereof |
| CN106918890A (en) * | 2015-12-24 | 2017-07-04 | 宁波舜宇车载光学技术有限公司 | Optical imaging lens and its lens group |
| CN105785557A (en) * | 2016-03-10 | 2016-07-20 | 浙江水晶光电科技股份有限公司 | Ultra-short-focus projection objective |
| CN106842590A (en) * | 2017-03-28 | 2017-06-13 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
| CN107144944A (en) * | 2017-07-19 | 2017-09-08 | 中山联合光电科技股份有限公司 | A kind of ultrashort out-of-focus projection's optical system |
| CN109445237A (en) * | 2019-01-10 | 2019-03-08 | 上海白泽网络科技有限公司 | Ultrashort coke optical projection system and electronic equipment |
| CN110568586A (en) * | 2019-08-30 | 2019-12-13 | 歌尔股份有限公司 | Projection lens and projection equipment |
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| CN112255767A (en) * | 2020-11-06 | 2021-01-22 | 歌尔光学科技有限公司 | Projection lens and projection equipment |
| CN114047613A (en) * | 2021-10-29 | 2022-02-15 | 歌尔光学科技有限公司 | Optical system and projection device |
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Application publication date: 20200814 |