WO2021036134A1 - Lentille de projection et dispositif de projection - Google Patents

Lentille de projection et dispositif de projection Download PDF

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Publication number
WO2021036134A1
WO2021036134A1 PCT/CN2019/128800 CN2019128800W WO2021036134A1 WO 2021036134 A1 WO2021036134 A1 WO 2021036134A1 CN 2019128800 W CN2019128800 W CN 2019128800W WO 2021036134 A1 WO2021036134 A1 WO 2021036134A1
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WO
WIPO (PCT)
Prior art keywords
lens
projection
display chip
prism structure
convex
Prior art date
Application number
PCT/CN2019/128800
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English (en)
Chinese (zh)
Inventor
何世峰
Original Assignee
歌尔股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 歌尔股份有限公司 filed Critical 歌尔股份有限公司
Publication of WO2021036134A1 publication Critical patent/WO2021036134A1/fr

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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
    • 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
    • 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

Definitions

  • the present invention relates to the field of projection technology, in particular to a projection lens and projection equipment.
  • the projection device When the projection device is used, different use environments require the projection device to have different projection brightness. When the projection environment is dark, the requirement for projection brightness is lower; when the projection environment is bright, the requirement for projection brightness is higher.
  • the miniaturization of each part of the miniature projection equipment, especially the miniaturization of the projection lens has high requirements.
  • the existing miniature projection lens has a small aperture, and the light emitted by the projection light source cannot pass through the projection lens after passing through the projection lens, thereby limiting the projection brightness of the projection device and affecting the display of the projection screen.
  • the present invention provides a projection lens and a projection device, and aims to solve the problem that the aperture of the projection lens in the prior art is small, which causes the projection brightness of the projection device to be low, and affects the display of the projection screen.
  • the projection lens includes a plurality of lenses arranged between the projection surface and the display chip, and the lens includes a first lens, a first lens, and a first lens along the direction of the projection surface of the display chip.
  • the first lens has a first surface concave toward the projection surface and a second surface concave toward the display chip;
  • the second lens has a third surface convex to the projection surface and a fourth surface convex to the display chip;
  • the first lens has negative refractive power
  • the second lens has positive refractive power
  • the first surface and the second surface are both aspherical structures.
  • the first lens group includes a third lens and a fourth lens
  • the third lens has a fifth surface convex toward the projection surface and a sixth surface concave toward the display chip;
  • the fourth lens has a seventh surface convex to the projection surface
  • the third lens and the fourth lens are cementedly connected with the seventh surface through the sixth surface.
  • the second lens group includes a fifth lens and a sixth lens
  • the fifth lens has an eighth surface concave toward the projection surface and a ninth surface concave toward the display chip;
  • the sixth lens has a tenth surface convex to the projection surface and an eleventh surface convex to the display chip;
  • the fifth lens and the sixth lens are glued and connected to the tenth surface through the ninth surface.
  • the first lens is made of plastic material.
  • the third surface and the fourth surface are both aspherical structures.
  • the projection lens further includes an aperture, and the aperture is provided between the first lens group and the second lens group.
  • the projection lens further includes a prism structure, the prism structure includes a twelfth surface, a thirteenth surface, and a fifteenth surface disposed opposite to each other, and further includes a twelfth surface and a fifteenth surface disposed on the twelfth surface.
  • the projection lens further includes a protective glass provided between the prism structure and the display chip.
  • this application proposes a projection device, which is characterized in that the projection device includes the projection lens as described in any of the foregoing embodiments.
  • the projection lens includes a first lens, a first lens group, a second lens group, and a second lens in sequence along the projection surface of the display chip;
  • the first lens has a concave projection surface
  • the first surface and the second surface of the display chip are concave;
  • the second lens has a third surface convex to the projection surface and a fourth surface convex to the display chip;
  • the first lens has For negative refractive power, the second lens has positive refractive power.
  • the light entering the projection lens from the first lens passes through the first lens, the first lens group, the second lens group, and the second lens in sequence after entering the projection lens.
  • the multiple lenses work together to increase the optics of the projection lens, thereby solving the problem that the aperture of the projection lens in the prior art is small, which causes the projection brightness of the projection device to be low, and affects the display of the projection image.
  • FIG. 1 is a schematic diagram of the structure of the projection lens of the present invention
  • FIG. 2 is a point diagram of the first embodiment of the projection lens of the present invention.
  • Fig. 3 is a modulation transfer function diagram of the first embodiment of the projection lens of the present invention.
  • Fig. 5 is a vertical axis chromatic aberration diagram of the first embodiment of the projection lens of the present invention.
  • Label name Label name 100 First lens 310 Fifth lens 200 The first mirror group 320 Sixth lens 300 Second mirror group 311 Ninth surface 400 Second lens 312 Tenth surface 110 First surface 321 Eleventh surface 120 Second surface 322 Twelfth surface 410 Third surface 500 Diaphragm 420 Fourth surface 600 Prism structure 210 Third lens 610 Thirteenth surface 220 Fourth lens 620 Fourteenth surface
  • the terms “connected”, “fixed”, etc. should be interpreted broadly.
  • “fixed” can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal communication between two components or an interaction relationship between two components, unless specifically defined otherwise.
  • the specific meanings of the above-mentioned terms in the present invention can be understood according to specific situations.
  • the invention provides a projection lens and projection equipment.
  • the projection lens includes a plurality of lenses arranged between the projection surface and the display chip 800, and the lenses sequentially include a first lens 100, a first lens group 200, and a second lens along the direction of the projection surface of the display chip 800.
  • the first lens 100 has a first surface 110 concave toward the projection surface and a second surface 120 concave toward the display chip 800;
  • the second lens 400 has a third surface 410 convex to the projection surface and a fourth surface 420 convex to the display chip 800;
  • the first lens 100 has negative refractive power
  • the second lens 400 has positive refractive power
  • the optical axes of the first lens 100, the first lens group 200, the second lens group 300, and the second lens 400 are collinear, and the optical axis of the first lens 100 is The vertical lines of the center of the display chip 800 are collinear.
  • the first lens group 200 is a lens combination formed by one lens or a combination of multiple lenses.
  • the phases of the multiple lenses are separated Or glued connection.
  • the projection lens includes a first lens 100, a first lens group 200, a second lens group 300, and a second lens 400 along the projection surface of the display chip.
  • the first lens 100 has a concave Facing the first surface 110 of the projection surface and concave toward the second surface 120 of the display chip;
  • the second lens 400 has a third surface 410 convex toward the projection surface and convex toward the display chip 800
  • the first lens 100 has a negative refractive power, and the second lens 400 has a positive refractive power.
  • the light entering the projection lens from the first lens 100 passes through the first lens 100, the first lens group 200, the second lens group 300, and the second lens group in sequence after entering the projection lens.
  • the two lenses 400 increase the aperture of the projection lens under the combined action of multiple lenses, thereby solving the problem that the aperture of the projection lens in the prior art is small, which causes the projection brightness of the projection device to be low, and affects the display of the projection image .
  • the first surface 110 and the second surface 120 are both aspherical structures.
  • the aspherical structure can effectively reduce the spherical structure of the optical system. Difference and distortion, thereby reducing the number of lenses in the optical system and reducing the size of the lenses.
  • the first lens group 200 includes a third lens 210 and a fourth lens 220.
  • the third lens 210 has a fifth surface 211 that is convex toward the projection surface and a concave surface.
  • the fourth lens 220 has a seventh surface 221 convex toward the projection surface and an eighth surface 222 on the side away from the projection surface.
  • the third lens 210 It is cementedly connected with the fourth lens 220. It can be understood that the relative position of the third lens 210 and the fourth lens 220 is not limited to this. In another embodiment, the third lens 210 and The relative position of the fourth lens 220 may also be phase separation or close connection.
  • the second lens group 300 includes a fifth lens 310 and a sixth lens 320.
  • the fifth lens 310 has a ninth surface 311 that is concave toward the projection surface and The tenth surface 312 of the display chip 800; the sixth lens 320 has an eleventh surface 321 convex toward the projection surface and a twelfth surface 322 on the side away from the projection surface.
  • the fifth lens The lens 310 is cementedly connected to the sixth lens 320. It can be understood that the relative position of the fifth lens 310 and the sixth lens 320 is not limited to this. In another embodiment, the fifth lens The relative position of 310 and the sixth lens 320 may also be separated or closely connected.
  • the first lens 100 is made of plastic material.
  • the second lens 400 is made of optical glass.
  • the third lens 210 and the fourth lens 220 are made of optical glass material
  • the fifth lens 310 and the sixth lens 320 in the second lens group 300 are made of optical glass material.
  • optical plastic Plastic has the advantages of strong plasticity, light weight and low processing cost.
  • the display chip 800 since the display chip 800 generates heat during operation, the optical glass has better thermal stability than optical plastics, so the sixth lens 320 close to the display chip 800 is made of optical glass. So as to avoid the influence of high temperature on the imaging of other lenses.
  • the third surface 410 and the fourth surface 420 are both aspherical structures.
  • an aspherical structure can effectively reduce the spherical aberration and distortion of the optical system, thereby reducing the number of lenses in the optical system and reducing the size of the lenses.
  • the projection lens further includes an aperture 500 which is provided between the first lens group 200 and the second lens group 300.
  • the diaphragm 500 is used to control the passage of light, adjust the luminous flux emitted from the optical system, and reduce the interference of stray light generated by other lenses through reflection.
  • the projection lens further includes a prism structure 600, which includes a thirteenth surface 610, a fourteenth surface 620, and a sixteenth surface 640 that are arranged opposite to each other, and also includes The fifteenth surface 630 between the thirteenth surface 610 and the fourteenth surface 620;
  • the prism structure 600 Light enters the prism structure 600 from the thirteenth surface 610, passes through the fifteenth surface 630, exits the prism structure 600 from the fourteenth surface 620, and is transmitted to the display chip 800. After being reflected on the display chip 800, it enters the prism structure 600 again from the fourteenth surface 620, reflects on the fifteenth surface 630, and emits the prism structure from the sixteenth surface 640.
  • Prism structure 600 In a preferred embodiment, the prism structure 600 is a right-angle prism, and the side length of the right-angle prism is 10.5 mm.
  • the projection lens further includes a protective glass 700 provided between the prism structure 600 and the display chip 800.
  • the protective glass 700 is used to protect the display chip 800 from the impact of the external environment or other elements.
  • the thickness of the protective glass 700 is 1.1 mm.
  • the design data of the projection lens is shown in Table 1 below:
  • the parameters are as follows:
  • the projection ratio of the projection lens is 1.2. Specifically, the projection ratio refers to the ratio of the projection distance to the projection screen width.
  • the aperture ratio of the projection lens is 1.65.
  • the aperture ratio refers to the ratio of the focal length to the aperture diameter.
  • Figure 2 is a spot diagram of the first embodiment.
  • the spot diagram means that after a lot of light emitted from one point passes through the optical system, the intersection with the image plane is no longer concentrated at the same point due to aberration. A dispersion pattern scattered in a certain range is formed to evaluate the imaging quality of the projection optical system.
  • the maximum value of the image point in the dot sequence diagram corresponds to the maximum field of view, and the root mean square radius in the dot sequence diagram is smaller than the pixel and less than 5.4 ⁇ m.
  • FIG. 3 is a diagram of the modulation transfer function of the first embodiment, where the modulation transfer function (Modulation Transfer Function, MTF) refers to the relationship between the modulation degree and the number of line pairs per millimeter in the image for evaluation The ability to restore the details of the scenery.
  • MTF Modulation Transfer Function
  • FIG. 4 is a diagram of field curvature and optical distortion of the first embodiment.
  • field curvature is used to indicate the position change of the beam image point of different field of view points away from the image plane
  • optical distortion refers to a certain view
  • the maximum field curvature difference is less than 0.2mm, where the maximum distortion is at the maximum field of view, and the maximum distortion is ⁇ 0.5%.
  • Figure 5 is the vertical axis chromatic aberration diagram of the first embodiment.
  • the vertical axis chromatic aberration is also called the chromatic aberration of magnification. It mainly refers to a polychromatic chief ray on the object side. When exiting, it becomes multiple rays, the difference between the focal positions of the hydrogen blue light and the hydrogen red light on the image plane; in the first embodiment, the maximum dispersion of the optical system is the maximum field of view of the optical system Location, the maximum chromatic aberration value of the optical system is less than 35 ⁇ m, which can meet the needs of users.
  • a projection lens is provided through a combination of the first lens 100, the first lens group 200, the second lens group 300, and the second lens 400.
  • the optical system composed of the projection lens has an aperture ratio equal to 1.65, a maximum distortion ⁇ 0.5%, a maximum chromatic aberration value less than 35 ⁇ m, and an image-side telecentric optical path with a large field of view.
  • the present application also proposes a projection optical system, which includes the projection lens described in any of the foregoing embodiments.
  • the projection lens further includes a display chip 800, which is arranged on a side of the protective glass 700 away from the first lens 100. Specifically, light passes through the first lens 100, the first lens 100, and the first lens 100 in sequence. After the first lens group 200, the second lens group 300, and the second lens 400, they enter the prism structure 600 from the thirteenth surface 610, and pass through the fifteenth surface 630 from the The fourteenth surface 620 emits the prism structure 600 and is transmitted to the display chip 800.
  • the display chip 800 may be a digital micromirror device (DMD) chip, a liquid crystal on silicon (Liquid Crystal On Silicon, LCOS) chip, or other display elements or display devices that can be used to emit light.
  • DMD digital micromirror device
  • LCOS liquid crystal on Silicon

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

L'invention concerne une lentille de projection, comprenant plusieurs lentilles disposées entre un plan de projection et une puce d'affichage (800), les lentilles comprenant dans l'ordre une première lentille (100), un premier groupe de lentilles (200), un deuxième groupe de lentilles (300) et une seconde lentille (400) dans une direction allant du plan de projection vers la puce d'affichage (800), la première lentille (100) présentant une première surface (110) étant concave vers le plan de projection et une seconde surface (120) étant concave vers la puce d'affichage (800) ; la seconde lentille (400) présentant une troisième surface (410) étant convexe vers le plan de projection et une quatrième surface (420) étant convexe vers la puce d'affichage (800) ; et la première lentille (100) ayant une puissance focale négative, et la seconde lentille (400) ayant une puissance focale positive. L'invention concerne également un dispositif d'affichage. Selon la lentille de projection et le dispositif de projection, le problème d'une lentille de projection existante ayant une petite ouverture, conduisant à une faible luminosité de projection du dispositif de projection et affectant l'affichage de l'image de projection est résolu.
PCT/CN2019/128800 2019-08-30 2019-12-26 Lentille de projection et dispositif de projection WO2021036134A1 (fr)

Applications Claiming Priority (2)

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CN201910822162.6A CN110568586B (zh) 2019-08-30 2019-08-30 投影镜头及投影设备
CN201910822162.6 2019-08-30

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WO2021036134A1 true WO2021036134A1 (fr) 2021-03-04

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CN110568586B (zh) * 2019-08-30 2024-06-04 歌尔光学科技有限公司 投影镜头及投影设备
CN111538199A (zh) * 2020-04-27 2020-08-14 歌尔光学科技有限公司 投影镜组和投影显示设备
CN111538200A (zh) * 2020-04-27 2020-08-14 歌尔光学科技有限公司 光学系统及投影装置
CN113419333B (zh) * 2021-06-22 2022-09-20 歌尔光学科技有限公司 投影镜组和投影装置
CN113933971B (zh) * 2021-10-29 2022-08-19 歌尔光学科技有限公司 投影镜头及投影装置

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