CN113985588A - Projection optical machine - Google Patents

Projection optical machine Download PDF

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Publication number
CN113985588A
CN113985588A CN202111275316.8A CN202111275316A CN113985588A CN 113985588 A CN113985588 A CN 113985588A CN 202111275316 A CN202111275316 A CN 202111275316A CN 113985588 A CN113985588 A CN 113985588A
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China
Prior art keywords
lens
projection
image
image source
projection lens
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CN202111275316.8A
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Chinese (zh)
Inventor
赵云
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Goertek Optical Technology Co Ltd
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Goertek Optical Technology Co Ltd
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Priority to CN202111275316.8A priority Critical patent/CN113985588A/en
Priority to PCT/CN2021/135212 priority patent/WO2023070826A1/en
Publication of CN113985588A publication Critical patent/CN113985588A/en
Pending legal-status Critical Current

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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
    • 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
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • 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

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

Abstract

The invention discloses a projection optical machine, which comprises a projection lens and an image source, wherein the image source is used for projecting light rays to the projection lens, the field angle and the focal length of the projection lens meet the requirement that the image source can be positioned in an image circle of the projection lens, and the light rays projected by the image source can form a clear image after passing through the projection lens. And the position of the projection lens relative to the image source satisfies the distance from the image center of the image source projected into the image circle of the projection lens to the optical axis of the projection lens, and the ratio of the image size of the image source projected into the image circle of the projection lens to half is larger than 1, so that the distance from the position of the optical axis of the projection lens projected onto the projection picture to the center of the projection picture is correspondingly larger than 1, namely, the projection optical machine reaches larger bias, and the condition that the projection picture is shielded in some application scenes can be avoided.

Description

Projection optical machine
Technical Field
The invention relates to the technical field of projection, in particular to a projection optical machine.
Background
With the development of the micro projector technology, the ultra-short focus projector gradually enters the field of vision of people. At present, the micro projector is mainly applied to the fields of home entertainment, education and learning, business meetings, military affairs and the like. In the field of projection light machines, offset (offset) is a key parameter, which represents the ratio of the distance from the position of the optical axis of the projection light machine projected onto the projection picture to the center of the projection picture to half the width of the projection picture.
The existing optical projection machine can reach the offset of 0 percent, namely the center of a projection picture is coincided with an optical axis, or the offset of the optical projection machine is 100 percent, namely the center of one side edge of the projection picture is coincided with the optical axis. However, in an application scenario where the projector engine is between the observer and the projection screen, the projection screen may be hidden by the projector engine when viewed from the observer.
Disclosure of Invention
The invention aims to provide a projection light machine which can achieve larger bias and avoid the condition that a projection picture is shielded in some application scenes.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a projection ray apparatus, includes projection lens and image source, the image source is used for to projection light is given out to projection lens, projection lens's angle of vision and focus satisfy and make the image source can be located in projection lens's image circle, projection lens for the position of image source satisfies the image center that the image source projects in projection lens image circle arrives the distance of projection lens optical axis, with the image source projects the ratio of half of the image size in projection lens image circle is greater than 1.
Preferably, the position of the projection lens relative to the image source satisfies that the ratio of the distance from the center of the image projected by the image source into the image circle of the projection lens to the optical axis of the projection lens to the half of the size of the image projected by the image source into the image circle of the projection lens is greater than or equal to 1.5.
Preferably, the position of the projection lens relative to the image source can be changed, so that the distance from the image center of the image source projected into the image circle of the projection lens to the optical axis of the projection lens can be changed.
Preferably, the position of the projection lens relative to the image source is changed by moving the projection lens relative to the image source.
Preferably, the projection lens includes a first lens group and a second lens group arranged in this order along an optical axis from a projection screen side to an image source side, the first lens group having negative power, and the second lens group having positive power.
Preferably, the first lens group includes a first lens, the distance from the first lens to the projection picture is smaller than the distance from any other lens in the first lens group to the projection picture, and at least one surface of the first lens is an aspheric surface;
and the second lens group comprises a seventh lens, the distance from the seventh lens to the image source is smaller than that from any other lens in the second lens group to the image source, and at least one surface of the seventh lens is an aspheric surface.
Preferably, the first lens group includes a first lens, a second lens, and a third lens, the radius of curvature of the front surface of the first lens is positive, the radius of curvature of the rear surface is positive, the front surface of the second lens is a plane, the radius of curvature of the rear surface is positive, the radius of curvature of the front surface of the third lens is positive, and the radius of curvature of the rear surface is negative.
Preferably, the second lens group includes a fourth lens, a fifth lens, a sixth lens and a seventh lens, the radius of curvature of the front surface of the fourth lens is positive, the radius of curvature of the rear surface of the fourth lens is negative, the radius of curvature of the front surface of the fifth lens is negative, the radius of curvature of the rear surface of the fifth lens is positive, the radius of curvature of the front surface of the sixth lens is positive, the radius of curvature of the rear surface of the sixth lens is negative, the radius of curvature of the front surface of the seventh lens is positive, and the radius of curvature of the rear surface of the seventh lens is negative.
Preferably, the fourth lens, the fifth lens and the sixth lens are cemented in sequence.
Preferably, the first lens group comprises a first lens, a second lens and a third lens, and has negative focal power, negative focal power and positive focal power in sequence; the second lens group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens, and has negative focal power, positive focal power and positive focal power in sequence.
According to the technical scheme, the projection optical machine comprises the projection lens and the image source, wherein the image source is used for projecting light rays to the projection lens, the angle of view and the focal length of the projection lens meet the requirement that the image source can be located in an image circle of the projection lens, and the light rays projected by the image source can form a clear image after passing through the projection lens. And the position of the projection lens relative to the image source satisfies the distance from the image center of the image source projected into the image circle of the projection lens to the optical axis of the projection lens, and the ratio of the image size of the image source projected into the image circle of the projection lens to half is larger than 1, so that the distance from the position of the optical axis of the projection lens projected onto the projection picture to the center of the projection picture is correspondingly larger than 1, namely, the projection optical machine reaches larger bias, and the condition that the projection picture is shielded in some application scenes can be avoided.
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 drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a projection lens image circle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an image source projected onto an image circle of a projection lens according to an embodiment of the present invention;
FIG. 3 is a schematic view of a projected image of a projector according to an embodiment of the present invention;
FIG. 4 is a schematic view of a projected image of a projector according to still another embodiment of the present invention;
FIG. 5 is a schematic diagram of an image source projected onto an image circle of a projection lens according to another embodiment of the present invention;
fig. 6 is a schematic view of a projection lens of a projection optical machine according to an embodiment of the present invention;
FIG. 7 is a graph of curvature of field of the projection lens of FIG. 6;
FIG. 8 is a distortion plot of the projection lens of FIG. 6;
fig. 9 is an MTF graph of the projection lens shown in fig. 6.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all 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.
The embodiment provides a projection optical machine, including projection lens and image source, the image source be used for to projection light is given out to projection lens, projection lens's angle of vision and focus satisfy and make image source can be located in projection lens's image circle, projection lens for the position of image source satisfies image source projects the image center in projection lens image circle arrives the distance of projection lens optical axis, with the image source projects the ratio of half the image size in projection lens image circle is greater than 1.
The image circle of the projection lens refers to a region on the focal plane of the projection lens, and light rays in the region can be clearly imaged after passing through the projection lens. The image source is positioned in the image circle of the projection lens, which means that light rays projected by the image source can form a clear image in the image circle of the projection lens after passing through the projection lens. Referring to fig. 1, fig. 1 is a schematic diagram illustrating an image circle of a projection lens in this embodiment, where a focal length of the projection lens 100 is F, an angle of view is θ, and the image circle of the projection lens 100 is a circular area with a diameter H and an optical axis of the projection lens 100 as a center on a focal plane of the projection lens 100. The image source 101 is located in the image circle of the projection lens 100, and then the light projected by the image source 101 can form a clear image in the image circle of the projection lens 100 after passing through the projection lens 100.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating an image source projected onto an image circle of a projection lens in the present embodiment, and since the projection optical engine of the present embodiment sets the image source 101 to be located in the image circle of the projection lens 100, an image 103 projected onto the image circle of the projection lens 100 by the image source 101 is located in the image circle 102 of the projection lens. The projection optical machine of this embodiment sets the center of the image source 101 to deviate from the optical axis of the projection lens 100, that is, the center of the image projected by the image source 101 onto the image circle of the projection lens 100 deviates from the optical axis of the projection lens 100, and the two do not coincide. And, the position of the projection lens 100 relative to the image source 101 is specifically set to satisfy the requirement that the distance from the center of the image 103 projected into the image circle of the projection lens by the image source 101 to the optical axis of the projection lens 100 is greater than 1 to the ratio of half of the size of the image 103 projected into the image circle of the projection lens by the image source 101.
According to the projection optical machine, the field angle and the focal length of the projection lens meet the requirement that an image source is located in an image circle of the projection lens, and it is guaranteed that light projected by the image source can form a clear image after passing through the projection lens. And the ratio of the distance from the image center of the image source projected into the image circle of the projection lens to the optical axis of the projection lens to half of the size of the image source projected into the image circle of the projection lens is greater than 1, so that the distance from the position of the optical axis of the projection lens projected onto the projection picture to the center of the projection picture is correspondingly greater than 1 to half of the size of the projection picture, namely, the projection optical machine achieves larger bias, and the condition that the projection picture is shielded in some application scenes can be avoided.
Preferably, the position of the projection lens 100 relative to the image source 101 satisfies that the ratio of the distance from the center of the image projected by the image source 101 into the image circle of the projection lens to the optical axis of the projection lens 100 to the half of the size of the image projected by the image source 101 into the image circle of the projection lens 100 is greater than or equal to 1.5. Accordingly, the ratio of the distance from the position of the optical axis of the projection lens 100 projected onto the projection picture to the center of the projection picture to half the size of the projection picture is greater than or equal to 1.5, that is, the offset of the projection optical engine is greater than or equal to 1.5.
If the image source 101 is square, the size of the image projected by the image source 101 through the projection lens 100 may be the width or length of the image projected by the image source 101 through the projection lens 100. If the image source 101 has other shapes, the size of the image projected by the image source 101 through the projection lens 100 may be other sizes of the image projected by the image source 101.
Referring to fig. 3, fig. 3 is a schematic diagram of a projection image projected by the projector 104 according to an embodiment, and a ratio of a distance from a position of the projection lens, where the optical axis of the projection lens projects onto the projection image, to a center of the projection image to a half of a width of the projection image is offset by 150%.
Referring to fig. 4, fig. 4 is a schematic diagram of a projection image of a projection optical machine according to yet another embodiment, in which the projection optical machine 104 projects an image to the ground, and a ratio of a distance from a position of the projection lens, on which the optical axis of the projection lens is projected, to a center of the projection image to a half of a width of the projection image, i.e., an offset of the projection optical machine, is 162%.
Further preferably, in the projection optical machine of this embodiment, the position of the projection lens 101 relative to the image source 100 may be changed, so that the distance from the image center of the image source 101 projected into the image circle of the projection lens 100 to the optical axis of the projection lens 100 may be changed, and thus the ratio of the distance from the image center of the image source 101 projected into the image circle of the projection lens 100 to the optical axis of the projection lens 100 to half the size of the image source 101 projected into the image circle of the projection lens 100 may be changed, so that the offset size of the projection optical machine may be changed. In practical application, the offset size of the projection light machine can be adjusted according to application requirements, and the use is more convenient.
The projection lens 100 may be arranged to be movable relative to the image source 101, thereby changing the position of the projection lens 100 relative to the image source 101. Fig. 5 is a schematic diagram illustrating an image source projected onto an image circle of a projection lens in yet another embodiment, where an arrow indicates a moving direction of the image circle 102 of the projection lens relative to a corresponding image 103 of the image source. As shown in the figure, the projection lens 100 may be configured to translate up and down relative to the image source 101, so that the image 103 projected into the image circle of the projection lens by the image source 101 can translate up and down relative to the image circle 102, and the adjustment of the offset of the projection optical machine in the vertical direction can be realized. Or, the projection lens 100 may be configured to translate left and right relative to the image source 101, so that the image 103 projected by the image source 101 into the image circle of the projection lens 100 can translate left and right relative to the image circle 102, thereby achieving the adjustment of the offset of the optical projection engine in the horizontal direction. It should be noted that, when the projection lens 100 is moved relative to the image source 101, the projection lens 100 is required to be moved to any position relative to the image source 101, and the image source 101 is always located within the image circle of the projection lens 100.
The image source may employ, but is not limited to, a Digital Micromirror Device (DMD).
Preferably, the projection optical machine may further include a prism disposed between the image source 101 and the projection lens 100, and light emitted from the image source 101 is transmitted through the prism and enters the projection lens 100. The prism may be, but is not limited to, a right triangle prism.
Optionally, the projection lens in the projection optical machine of this embodiment may include a first lens group and a second lens group that are sequentially disposed along an optical axis from the projection screen side to the image source side, where the first lens group has negative focal power, and the second lens group has positive focal power. The field angle and the focal length of the projection lens meet the requirement that an image source can be located in an image circle of the projection lens, and the number of lens groups contained in the projection lens is small, so that the reduction of the size of the lens is facilitated, and the application to a micro projector is facilitated.
Preferably, the first lens group includes a first lens, a distance from the first lens to the projection screen is smaller than a distance from any other lens in the first lens group to the projection screen, and at least one surface of the first lens is an aspheric surface. For a lens with a large field angle, the aberration of the marginal field of view occupies the main part, and the most effective way for reducing the marginal aberration is to use aspheric lenses at two ends of the lens, so that the first lens of the projection lens adopts an aspheric surface, the marginal aberration can be effectively reduced, and the imaging quality of the projection lens is improved.
Preferably, the second lens group includes a seventh lens, the distance from the seventh lens to the image source is smaller than the distance from any other lens in the second lens group to the image source, and at least one surface of the seventh lens is an aspheric surface. The seventh lens closest to the image source in the projection lens adopts an aspheric surface, so that the edge aberration can be effectively reduced, and the imaging quality of the projection lens is improved.
Preferably, the projection lens can be provided with at least one diaphragm according to requirements so as to reduce stray light and be beneficial to improving the imaging quality.
Preferably, antireflection films can be arranged on the front surface and the rear surface of each lens of the projection lens, so that the light transmission efficiency of the lenses is improved through the antireflection films, the light energy loss is reduced, and the quality of images projected by a projection light machine is improved. In the projection lens of the present embodiment, the front surface of the lens refers to the surface of the lens facing the projection screen side, and the rear surface of the lens refers to the surface of the lens facing the image source side.
Optionally, referring to fig. 6, fig. 6 is a schematic view of a projection lens of a projection optical machine according to an embodiment, as shown in the figure, the projection lens includes a first lens group G1 and a second lens group G2 sequentially disposed along an optical axis from a projection screen side to an image source side.
The first lens group G1 includes a first lens 11, a second lens 12, and a third lens 13, each having negative, and positive powers in this order. The radius of curvature of the front surface of the first lens 11 is positive, the radius of curvature of the rear surface is positive, the front surface of the second lens 12 is flat, the radius of curvature of the rear surface is positive, the radius of curvature of the front surface of the third lens 13 is positive, and the radius of curvature of the rear surface is negative.
The second lens group G2 includes a fourth lens 14, a fifth lens 15, a sixth lens 16, and a seventh lens 17, each having negative, positive, and positive powers in this order. The radius of curvature of the front surface of the fourth lens 14 is positive, the radius of curvature of the rear surface is negative, the radius of curvature of the front surface of the fifth lens 15 is negative, the radius of curvature of the rear surface is positive, the radius of curvature of the front surface of the sixth lens 16 is positive, the radius of curvature of the rear surface is negative, the radius of curvature of the front surface of the seventh lens 17 is positive, and the radius of curvature of the rear surface is negative.
Preferably, the fourth lens 14, the fifth lens 15 and the sixth lens 16 are sequentially cemented, and the chromatic aberration of the projection lens can be reduced by using the cemented lens, and in addition, the difficulty of the assembly process of the lens can be reduced.
The present projection lens has a stop 10 disposed between the first lens group G1 and the second lens group G2.
The detailed optical data of the projection lens of the present embodiment are shown in table 1, and the unit of thickness and half-aperture is millimeter.
TABLE 1
Lens profile Focal power Thickness of Refractive index Abbe number Half caliber
First lens
11 Aspherical surface -0.064 2.825 1.53 5.58 9.19
Second lens 12 Spherical surface -0.081 2.812 1.62 63.4 6.5
Third lens 13 Spherical surface 0.08 4 1.83 42.7 5.4
Fourth lens 14 Spherical surface -0.006 4.6 1.6 65.5 4.36
Fifth lens 15 Spherical surface -0.028 1.476 1.81 25.5 4.5
Sixth lens 16 Spherical surface 0.038 4 1.79 44.2 5.5
Seventh lens 17 Aspherical surface 0.063 3.1 1.59 61.2 5.5
The first lens 11 and the seventh lens 17 in the projection lens are designed to be aspheric surfaces, and the curve equation of the aspheric surfaces is as follows:
Figure BDA0003329158270000081
wherein z represents a perpendicular distance between a point on the aspherical curve and the optical axis,
Figure BDA0003329158270000082
c denotes the curvature of the aspheric apex, K denotes the conic coefficient, A1、A2、A3、A4、A5Respectively, high-order even-order aspheric coefficients.
Aspherical coefficients of the first lens 11 and the seventh lens 17 are shown in table 2, in which surfaces 11a and 11b represent front and rear surfaces of the first lens 11, respectively, and surfaces 17a and 17b represent front and rear surfaces of the seventh lens 17, respectively. The field curvature graph, distortion graph and MTF graph of the projection lens of the present embodiment are shown in fig. 7, 8 and 9 respectively,
TABLE 2
Noodle K A1 A2 A3 A4 A5
11a -7.195 0 4.038E-004 -6.254E-006 4.195E-08 -1.287E-010
11b -1.159 0 5.778E-004 -3.369E-006 -1.935E-07 9.065E-010
17a -2.663 0 -1.881E-004 1.216E-007 -5.386E-08 -2.788E-09
17b -9.375 0 -1.966E-004 3.081E-006 -1.791E-07 -8.081E-011
Table 3 shows the value ranges of the effective aperture and the focal length ratio of the first lens to the seventh lens.
TABLE 3
Range of effective aperture/focal length
First lens
11 0.58～0.6
Second lens 12 0.51～0.53
Third lens 13 0.42～0.44
Fourth lens 14 0.02～0.04
Fifth lens 15 0.12～0.14
Sixth lens 16 0.2～0.22
Seventh lens 17 0.34～0.36
The projection lens of the embodiment is applied to a projection optical machine, and referring to fig. 6, a prism 105 is disposed between the projection lens and the image source 101. The projection lens of this embodiment has only used 7 lenses, is applied to the projection ray apparatus and can realize 162% offset's projection effect, has strengthened user experience.
The projection optical machine provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

1. The projection optical machine is characterized by comprising a projection lens and an image source, wherein the image source is used for projecting light rays to the projection lens, the field angle and the focal length of the projection lens meet the requirement that the image source can be positioned in an image circle of the projection lens, the position of the projection lens relative to the image source meets the requirement that the distance from an image center of the image source projected into the image circle of the projection lens to an optical axis of the projection lens is greater than 1, and the ratio of the distance to half of the image size of the image source projected into the image circle of the projection lens is greater than 1.
2. The projection optical machine of claim 1, wherein the position of the projection lens relative to the image source satisfies a ratio of a distance from a center of an image projected by the image source into the projection lens image circle to an optical axis of the projection lens to a half of a size of an image projected by the image source into the projection lens image circle being greater than or equal to 1.5.
3. The light-machine of claim 1, wherein the position of the projection lens relative to the image source is changeable such that the distance from the center of the image projected by the image source into the image circle of the projection lens to the optical axis of the projection lens is changeable.
4. The light projector as defined in claim 3, wherein the position of the projection lens relative to the image source is changed by moving the projection lens relative to the image source.
5. The projection optical machine of any of claims 1-4, wherein the projection lens comprises a first lens group and a second lens group arranged in sequence along the optical axis from the side of the projection screen to the side of the image source, the first lens group having negative optical power, and the second lens group having positive optical power.
6. The light-machine of claim 5, wherein the first lens group comprises a first lens, a distance from the first lens to the projection image is smaller than a distance from any other lens in the first lens group to the projection image, and at least one surface of the first lens is an aspheric surface;
and the second lens group comprises a seventh lens, the distance from the seventh lens to the image source is smaller than that from any other lens in the second lens group to the image source, and at least one surface of the seventh lens is an aspheric surface.
7. The light engine of claim 5, wherein the first lens group comprises a first lens, a second lens and a third lens, the first lens has a positive front surface and a positive rear surface, the second lens has a flat front surface and a positive rear surface, and the third lens has a positive front surface and a negative rear surface.
8. The light engine of claim 5, wherein the second lens group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens, the radius of curvature of the front surface of the fourth lens is positive, the radius of curvature of the rear surface of the fourth lens is negative, the radius of curvature of the front surface of the fifth lens is negative, the radius of curvature of the rear surface of the fifth lens is positive, the radius of curvature of the front surface of the sixth lens is positive, the radius of curvature of the rear surface of the sixth lens is negative, the radius of curvature of the front surface of the seventh lens is positive, and the radius of curvature of the rear surface of the seventh lens is negative.
9. The light engine of claim 8, wherein the fourth lens, the fifth lens, and the sixth lens are cemented in sequence.
10. The light engine of claim 5, wherein the first lens group comprises a first lens, a second lens and a third lens, and has a negative power, a negative power and a positive power; the second lens group comprises a fourth lens, a fifth lens, a sixth lens and a seventh lens, and has negative focal power, positive focal power and positive focal power in sequence.
CN202111275316.8A 2021-10-29 2021-10-29 Projection optical machine Pending CN113985588A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114594574A (en) * 2022-03-31 2022-06-07 歌尔光学科技有限公司 Optical projection system and electronic equipment

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