CN113419329A - Optical system and projection equipment - Google Patents
Optical system and projection equipment Download PDFInfo
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- CN113419329A CN113419329A CN202110606627.1A CN202110606627A CN113419329A CN 113419329 A CN113419329 A CN 113419329A CN 202110606627 A CN202110606627 A CN 202110606627A CN 113419329 A CN113419329 A CN 113419329A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 67
- 239000011521 glass Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 230000004075 alteration Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000005499 meniscus Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000012634 optical imaging Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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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
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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
- G02B13/24—Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances
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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
Abstract
The invention discloses an optical system and a projection device. The optical system comprises a display module and a first lens group. The first lens group is arranged in the light emitting direction of the display module, and the central axis of the first lens group is positioned on the lower side of the central axis of the display module; the first lens group includes, arranged in a light-emitting direction: at least one positive lens and a cemented lens; the cemented lens comprises a negative lens, a positive lens and a negative lens which are sequentially cemented along the light-emitting direction, and the cemented lens has positive focal power. When image light emitted by the display module is projected to the first lens group from the upper side of the central axis of the first lens group, the positive lens converges the light and is converged again by the cemented lens to project an image on a screen on the lower side of the central axis of the first lens group, so that eccentric projection of the image is realized, and the problem that a projected image is lost or even cannot be projected due to the fact that the image projected by the optical system is shielded by a shielding object is solved.
Description
Technical Field
The invention belongs to the technical field of optical imaging, and particularly relates to an optical system and projection equipment.
Background
Short-focus projection lenses on the market are mostly used in projection optical machines for projecting walls, systems for projecting on desktops are not common, the lenses are mostly used in interactive intelligent sound equipment, pocket-type micro projection equipment, game machines and other equipment, and with the expansion of the applications, the demand of the short-focus lenses for desktop projection is increasing day by day. The short-focus lens can only project along the axis of the optical system, so that a projection picture projected by the projection equipment is partially shielded, and the viewing effect of a user is influenced.
Disclosure of Invention
The present invention is directed to an optical system and a projection system, and aims to improve the above disadvantage that a short-focus lens is easily blocked, and prevent partial images from being blocked by eccentric projection of an image through the optical system.
In order to solve the above technical problems, an optical system is provided, which has an up-down direction and includes a display module and a first lens group. The first lens group is arranged in the light emitting direction of the display module, the central axis of the first lens group is located on the lower side of the central axis of the display module and used for converging light emitted by the display module towards the lower side of the central axis of the first lens group to form an intermediate image. Wherein, first lens group includes along arranging of light-emitting direction: at least one positive lens and a cemented lens; the cemented lens comprises a negative lens, a positive lens and a negative lens which are sequentially cemented along a light-emitting direction, and the cemented lens has positive focal power.
Further, the first lens group comprises, arranged in sequence along the direction of light emission: a first positive lens, a second negative lens, a third positive lens, a fourth negative lens; the second negative lens and the fourth negative lens are respectively glued on two sides of the third positive lens to form the glued lens; the focal length range of the cemented lens is 25mm to 110 mm; the focal length range of the first positive lens is 10mm to 20 mm.
Furthermore, the first positive lens is made of glass, the first positive lens comprises a first surface and a second surface which are arranged oppositely, the first surface is a light incident surface of the first positive lens, the second surface is a light emergent surface of the first positive lens, and the first surface and the second surface are aspheric surfaces.
Further, the optical system further comprises a diaphragm and a second lens group. The diaphragm is arranged on one side, deviating from the display module, of the first lens group. The second lens group is arranged on one side of the diaphragm, which deviates from the first lens group, and is used for passing through and facing the lower side of the central axis to converge light passing through the diaphragm.
Further, the second lens group includes along the light-emitting direction set gradually: a fifth positive lens and a sixth positive lens; the focal length range of the fifth positive lens is 10mm to 20 mm; the focal length range of the sixth positive lens is 50mm to 150 mm.
Further, the optical system further includes a third lens group. The third lens group is arranged on one side, far away from the diaphragm, of the second lens group and is used for magnifying and projecting the converged intermediate image to form a picture image.
Further, the third lens group includes that it sets gradually along the light-emitting direction: a seventh negative lens and an eighth negative lens; the focal length range of the seventh negative lens is-13 mm to-8 mm, and the focal length range of the eighth negative lens is-15 mm to-10 mm.
Further, the material of the eighth negative lens is plastic; the eighth negative lens comprises a third surface and a fourth surface which are oppositely arranged, the third surface is a light incident surface of the eighth negative lens, the fourth surface is a light emergent surface of the eighth negative lens, and the third surface and the fourth surface are aspheric surfaces.
Further, a ratio of a distance from a center of a picture image formed by the optical system to a central axis of the first lens group to a half height of the picture image is less than or equal to 140%.
The invention also proposes a projection device comprising an optical system as described above.
The embodiment of the invention provides an optical system and projection equipment. The display module is used for modulating light to form image light; when image light is projected to the first lens group from the upper side of the central axis, the positive lens of the first lens group converges the image light and transmits the image light to the cemented lens formed by the negative lens, the positive lens and the negative lens through the cementing lens, and the cemented lens converges the image light so as to project an image on a screen at the lower side of the central axis of the first lens group.
Drawings
FIG. 1 is a schematic diagram of an optical system according to the present invention;
FIG. 2 is a schematic projection view of an optical system according to the present invention;
FIG. 3 is a diagram of field curvature and optical distortion of an optical system according to the present invention;
FIG. 4 is a diagram of the modulation transfer function of the optical system of the present invention;
FIG. 5 is a vertical axis chromatic aberration diagram of a projection optical system of the present invention;
fig. 6 is a schematic diagram of light transmission of the optical system according to the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 11 | |
50 | |
| 20 | |
51 | Seventh negative lens |
| 21 | A first |
52 | Eighth |
| 22 | Second |
211 | |
| 23 | Third |
212 | |
| 24 | Fourth |
521 | |
| 30 | |
522 | The |
| 40 | |
12 | |
| 41 | Fifth |
13 | |
| 42 | Sixth positive lens |
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
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 for descriptive purposes only 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 addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1, an optical system having a vertical direction includes a display module 11 and a first lens group 20. The first lens group 20 is disposed in the light emitting direction of the display module 11, and the central axis of the first lens group 20 is located at the lower side of the central axis of the display module 11, so as to converge the light emitted by the display module 11 toward the lower side of the central axis of the first lens group 20, and form an intermediate image. Wherein, the first lens group 20 includes, arranged in the light emitting direction: at least one positive lens and a cemented lens; the cemented lens comprises a negative lens, a positive lens and a negative lens which are sequentially cemented along the light-emitting direction, and the cemented lens has positive focal power.
In the embodiment, the central axis of the display module 11 is located on the upper side of the central axis of the first lens assembly 20, so the light emitted by the display module 11 also faces the upper side of the central axis of the first lens assembly 20. The display module 11 is used for modulating light to form image light; when the image light is projected to the upper side of the first lens group 20, the positive lens of the first lens group 20 converges the image light and transmits to the cemented lens formed by the negative lens, the positive lens and the negative lens cemented together, and the cemented lens converges the image light again to project the image on the screen at the lower side of the central axis of the first lens group 20, thereby realizing the decentered projection of the image. It is prevented that a blocking object is formed in the extending direction of the central axis of the first lens group 20. The forward projection of the shielding optical system realizes that light bypasses a shielding object by projecting an image eccentrically, and the complete map image is projected onto a screen.
The positive lens has positive focal power and has a light-gathering effect on light, and means that when parallel light rays pass through the lens, the light rays converge in a direction close to the axis. The negative lens has a divergent effect on light, and is also called as a divergent lens, which means that when parallel light rays pass through the lens, the light rays diverge in a direction away from the axis.
Further, the first lens group 20 includes, in order along the direction of light emission: a first positive lens 21, a second negative lens 22, a third positive lens 23, and a fourth negative lens 24; the second negative lens 22 and the fourth negative lens 24 are respectively cemented on two sides of the third positive lens 23 to form a cemented lens; the focal length of the cemented lens ranges from 25mm to 110 mm; the focal length of the first positive lens 21 ranges from 10mm to 20 mm.
In the specific embodiment, the first positive lens 21 is a biconvex positive lens, the second negative lens 22 is a meniscus negative lens, the third positive lens 23 is a biconvex positive lens, the fourth negative lens 24 is a meniscus negative lens, the second negative lens 22 has a concave surface and a convex surface that are oppositely disposed, and the convex surface of the second negative lens 22 faces the first positive lens; the third positive lens 23 has two oppositely disposed convex surfaces; the concave surface of the second negative lens 22 faces the convex surface of the third positive lens 23 and is glued with the convex surface of the third positive lens 23; the fourth negative lens 24 has a concave surface and a convex surface which are oppositely arranged, the concave surface of the fourth lens 24 faces the third positive lens 23 and is glued with the other convex surface of the third positive lens 23; in this way, the second negative lens 22 and the fourth lens 24 are cemented with two opposite convex surfaces of the third positive lens 23, respectively, to form a cemented lens. The focal length of the formed cemented lens ranges from 25mm to 110 mm; the focal length of the first positive lens 21 ranges from 10mm to 20 mm. The first positive lens 21 is used to converge the light emitted from the display module 11, and the cemented lens converges the image light again so that the image light forms an intermediate image at a lower side position toward the central axis of the first lens group 20.
Further, the material of the first positive lens 21 is glass, the first positive lens 21 includes a first surface 211 and a second surface 212 that are disposed opposite to each other, the first surface 211 is a light incident surface of the first positive lens 21, the second surface 212 is a light emitting surface of the first positive lens 21, and the first surface 211 and the second surface 212 are aspheric surfaces.
In a specific embodiment, compared with a spherical structure, the aspheric structure can effectively reduce spherical aberration and distortion of an optical system, and further improve imaging quality. In the prior art, a plurality of lenses are arranged for eliminating chromatic aberration, and the invention is further used for eliminating chromatic aberration by arranging an aspheric surface; thereby reducing the number of lenses in the optical system.
Further, the optical system further includes a stop 30 and a second lens group 40. The stop 30 is disposed on a side of the first lens group 20 facing away from the display module 11, and is used for receiving and adjusting the light of the intermediate image converged by the first lens group 20. The second lens group 40 is arranged on the side of the stop 30 facing away from the first lens group 20.
In the embodiment, the image light converged toward the lower side of the central axis by the first lens group 20 forms an intermediate image on the stop 30, and the light of the intermediate image is adjusted by the stop 30, so as to control how much light projected from the first lens group 20 passes through the stop 30, thereby adjusting the image light. The second lens group 40 is arranged on the side of the stop 30 facing away from the first lens group 20.
Further, the second lens group 40 includes, in order along the light exit direction: fifth and sixth positive lenses 41 and 42; the focal length of the fifth positive lens 41 ranges from 10mm to 20 mm; the focal length of the sixth positive lens 42 ranges from 50mm to 150 mm.
In the specific embodiment, the fifth positive lens 41 is a double convex positive lens, the sixth positive lens 42 is a meniscus positive lens, the fifth positive lens 41 has two oppositely disposed convex surfaces, and the two convex surfaces face the diaphragm 30 and the sixth positive lens 42 respectively; the sixth positive lens 42 has a convex surface and a concave surface which are oppositely arranged, the convex surface of the sixth positive lens 42 faces the fifth positive lens 41, and the concave surface of the sixth positive lens 42 faces away from the fifth positive lens 41. The focal length of the fifth positive lens 41 ranges from 10mm to 20 mm; the focal length of the sixth positive lens 42 ranges from 50mm to 150 mm.
Further, the optical system further includes a third lens group 50. The third lens group 50 is disposed on a side of the second lens group 40 remote from the stop 30.
In a specific embodiment, as shown in fig. 2, the third lens group 50 projects the intermediate image converged by the second lens group 40 onto the screen below the central axis in a diffused manner, so that the light of the projection can be effectively prevented from being blocked by the forward blocking object of the optical system, and the projection is more convenient. The central axis of the first lens group 20, the central axis of the second lens group 40, and the central axis of the third lens group 50 are all aligned.
Further, the third lens group 50 includes, in order along the light exit direction: seventh and eighth negative lenses 51 and 52; the focal length range of the seventh negative lens 51 is-13 mm to-8 mm, and the focal length range of the eighth negative lens 52 is-15 mm to-10 mm.
In a specific embodiment, the seventh negative lens 51 is a biconcave negative lens, and the eighth negative lens 52 is a meniscus negative lens; the concave surface of the sixth positive lens 42 faces the seventh negative lens 51. The seventh negative lens 51 has two concave surfaces disposed opposite to each other. The two concave surfaces face the sixth positive lens 42 and the eighth negative lens 52, respectively. The eighth negative lens 52 has a concave surface and a convex surface oppositely arranged, and the concave surface of the eighth negative lens 52 faces the seventh negative lens 51. The focal length range of the seventh negative lens 51 is-13 mm to-8 mm, and the focal length range of the eighth negative lens 52 is-15 mm to-10 mm.
Further, the material of the eighth negative lens 52 is plastic; the eighth negative lens 52 includes a third surface 521 and a fourth surface 522 that are disposed oppositely, where the third surface 521 is a light incident surface of the eighth negative lens 52, and the fourth surface 522 is a light emergent surface of the eighth negative lens 52; the third surface 521 and the fourth surface 522 are aspheric.
In the specific embodiment, the eighth lens 52 made of glass has good optical characteristics, such as higher transmittance. Compared with a spherical structure, the aspheric structure can effectively reduce spherical aberration and distortion of the optical system. In the prior art, a plurality of lenses are arranged to eliminate chromatic aberration, and the invention is further used for eliminating chromatic aberration by arranging an aspheric surface.
Further, the ratio of the distance from the center of the picture image formed by the optical system to the central axis of the first lens group 20 to half the height of the picture image is less than or equal to 140%. Projection light that optical system launched throws on the screen of the downside of axis for when the short distance is thrown, can effectively prevent to shelter from the projected light because of optical system's forward direction shelter from thing, make the projection more convenient.
The shortest distance between the first positive lens 21 and the cemented lens is 0.3 mm; the shortest distance between the cemented lens and the diaphragm 13 is 3.6 mm; the shortest distance between the fifth positive lens 41 and the diaphragm 13 is 2.9 mm; the shortest distance between the fifth positive lens 41 and the sixth positive lens 42 is 1.2 mm; the shortest distance between the seventh negative lens 51 and the sixth positive lens 42 is 3.7 mm; the shortest distance between the eighth negative lens 52 and the seventh negative lens 51 is 6.6 mm. Based on the optical imaging principle, using optical design software, according to the focal length formula of the combined lens: r ═ R1+R2-dR1R2。
Wherein R is the reciprocal of the focal length of the first and second lens combination, R1、R2Is the reciprocal of the focal length of the first and second lenses, and d is the distance between the lenses. It can be seen that the total focal length of the lens assembly composed of the first lens assembly 20, the second lens assembly 40 and the third lens assembly 50 is less than or equal to 3.3 mm.
The optical system further includes a protection glass 12 and an equivalent turning prism 13, the protection glass 12 is disposed in the light-emitting direction of the display module 11, and the equivalent turning prism 13 is disposed between the protection glass 12 and the first lens group 20. The equivalent turning prism 13 is used for transmitting the light emitted or reflected by the display module 11 to the first lens group 20; the protective glass 12 is used to protect the display module 11 from external force and contaminants.
In the present embodiment, the parameters of the optical system are as follows:
the total lens length of the optical system is 49 mm;
the total focal length of the optical system is less than or equal to 3.3 mm;
the half-image height of the optical system is 2.95 mm;
the half-field of the optical system is 41.7 degrees;
the F # of the optical system is 1.7;
the chief ray angle of the optical system is less than 0.9 deg..
Referring to fig. 3, fig. 3 is a graph of field curvature and optical distortion, where the field curvature is used to indicate the position change of a beam image point of different view field points away from an image side, and the optical distortion is the vertical axis distance between a principal ray at a dominant wavelength of a certain view field and an ideal image point of the image side focus; in the present embodiment, the wavelength of the lens group is selected in the range of 455nm to 613nm, wherein the field curvature in the tangential plane and the sagittal plane are both less than ± 0.05mm, and the optical distortion in the full field of view is between 0% and 1%, so the distortion of the projection image of the system is not easily perceived by human eyes, and the distortion does not need to be corrected by electronic calibration of the display chip.
Referring to fig. 4, fig. 4 is a Modulation Transfer Function (MTF) graph, wherein the MTF is a relationship between Modulation degree and a line-per-millimeter logarithm in an image for evaluating detail reduction capability of a scene. Higher values of the vertical axis of the modulation transfer function indicate higher resolution. In this embodiment, the wavelength of the lens group is selected from 455nm to 613nm, and the values of the modulation transfer function in the meridional direction (T) and the Sagittal direction (S) are shown when the half-image heights are 0mm, 0.518mm, 1.814mm, 2.3058mm, 3.11mm and 3.9mm, respectively, and specifically, the values of the modulation transfer function in the spatial frequency range from 0lp/mm to 93lp/mm are between 0.5 and 1.0, and the values of the modulation transfer function in the central field of view are between 0.55 and 1.0, which indicates that the resolution of the final projection image is high, and the lens group has excellent optical performance.
Referring to fig. 5, fig. 5 is a vertical axis chromatic aberration diagram of a projection optical system, and a vertical axis chromatic aberration diagram of the projection optical system, wherein the vertical axis chromatic aberration is also called magnification chromatic aberration, mainly refers to a polychromatic main light of an object side, which is dispersed by a refraction system and is converted into a plurality of light rays when being emitted from an image side, and a difference value of focus positions of hydrogen blue light and hydrogen red light on an image plane is shown; if the pixel size of the optical system is 5.4um, the lateral chromatic aberration of the lens in the full-view visible light band is within 0.6 pixel range, which is hard to be perceived by human eyes.
The design data of the optical system is shown in the following table 1:
TABLE 1
y is the height of the center of the mirror surface, Z is the position of the aspheric surface structure with the height of Y along the axis direction, the displacement value from the axis is taken as the reference of the surface vertex, C is the vertex curvature radius of the aspheric surface, and K is the cone coefficient; α 1, α 2, α 3, α 4 are aspherical high-order term coefficients of the aspherical lens. The details are shown in Table 2.
TABLE 2
The invention also proposes a projection device comprising an optical system as described above. In the projection device, the lens formed by the optical system can reduce the focal length and can form offset transmission, so that the projection device can be more widely applied.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An optical system characterized by having an up-down direction in the optical system; the optical system includes:
a display module;
the first lens group is arranged in the light emitting direction of the display module, the central axis of the first lens group is positioned at the lower side of the central axis of the display module, and the first lens group is used for converging light emitted by the display module towards the lower side of the central axis of the first lens group and forming an intermediate image;
wherein, first lens group includes along arranging of light-emitting direction: at least one positive lens and a cemented lens; the cemented lens comprises a negative lens, a positive lens and a negative lens which are sequentially cemented along a light-emitting direction, and the cemented lens has positive focal power.
2. The optical system according to claim 1, wherein the first lens group comprises, in order in a direction of light emission: a first positive lens, a second negative lens, a third positive lens, a fourth negative lens; the second negative lens and the fourth negative lens are respectively glued on two sides of the third positive lens to form the glued lens; the focal length range of the cemented lens is 25mm to 110 mm; the focal length range of the first positive lens is 10mm to 20 mm.
3. The optical system of claim 2, wherein the first positive lens is made of glass, the first positive lens includes a first surface and a second surface opposite to each other, the first surface is a light incident surface of the first positive lens, the second surface is a light emergent surface of the first positive lens, and the first surface and the second surface are aspheric surfaces.
4. The optical system of claim 1, further comprising:
the diaphragm is arranged on one side, away from the display module, of the first lens group;
and the second lens group is arranged on one side of the diaphragm, which deviates from the first lens group.
5. The optical system according to claim 4, wherein the second lens group comprises, arranged in order in a light exit direction: a fifth positive lens and a sixth positive lens; the focal length range of the fifth positive lens is 10mm to 20 mm; the focal length range of the sixth positive lens is 50mm to 150 mm.
6. The optical system of claim 4, further comprising:
and the third lens group is arranged on one side of the second lens group, which is far away from the diaphragm.
7. The optical system according to claim 6, wherein the third lens group comprises, arranged in order in a light exit direction: a seventh negative lens and an eighth negative lens; the focal length range of the seventh negative lens is-13 mm to-8 mm, and the focal length range of the eighth negative lens is-15 mm to-10 mm.
8. The optical system of claim 7, wherein the material of the eighth negative lens is plastic; the eighth negative lens comprises a third surface and a fourth surface which are oppositely arranged, the third surface is a light incident surface of the eighth negative lens, the fourth surface is a light emergent surface of the eighth negative lens, and the third surface and the fourth surface are aspheric surfaces.
9. The optical system according to claim 6, wherein a ratio of a distance from a center of a picture image formed by the optical system to a central axis of the first lens group to a half height of the picture image is 140% or less.
10. A projection device, characterized in that the projection device comprises an optical system as claimed in any one of claims 1 to 9.
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| CN202110606627.1A CN113419329A (en) | 2021-05-31 | 2021-05-31 | Optical system and projection equipment |
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| CN202110606627.1A CN113419329A (en) | 2021-05-31 | 2021-05-31 | Optical system and projection equipment |
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| CN113419329A true CN113419329A (en) | 2021-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023070826A1 (en) * | 2021-10-29 | 2023-05-04 | 歌尔光学科技有限公司 | Optical projector |
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