CN117111274A - Low image offset optical system - Google Patents
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- CN117111274A CN117111274A CN202311369002.3A CN202311369002A CN117111274A CN 117111274 A CN117111274 A CN 117111274A CN 202311369002 A CN202311369002 A CN 202311369002A CN 117111274 A CN117111274 A CN 117111274A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 44
- 239000011521 glass Substances 0.000 claims abstract description 29
- 238000003384 imaging method Methods 0.000 claims abstract description 19
- 238000005286 illumination Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 230000004075 alteration Effects 0.000 claims description 39
- 238000002834 transmittance Methods 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 5
- 230000005499 meniscus Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 201000009310 astigmatism Diseases 0.000 description 3
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- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 206010010071 Coma Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 210000001747 pupil Anatomy 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
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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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
- 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
- G03B21/28—Reflectors in projection beam
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Abstract
The application provides a low image bias optical system, which comprises a light valve and a projection lens; the light valve is used for providing high-resolution image light beams; the projection lens comprises an illumination prism, an image offset mirror, a refraction system and a reflection system; wherein the refractive system comprises at least 1 aspherical mirror; the reflection system consists of a free-form surface reflector and curved surface light outlet glass, the whole mechanism of the system is compact, high-resolution imaging quality is realized through an aperture diaphragm, a spherical lens, a cemented lens, the free-form surface reflector and reasonable material collocation, and meanwhile, the spherical surface, the cylindrical surface or the non-spherical surface light outlet glass except the cylindrical surface is specially arranged, so that the requirements on performance and volume are effectively balanced under the conditions of ultra-short projection ratio, lower offset and larger wavelength range, and the mass productivity of the lens is improved.
Description
Technical Field
The application relates to the field of projection display, in particular to a low-image offset optical system.
Background
The projection display is a method or device for controlling a light source by plane image information, amplifying and displaying an image on a projection screen by utilizing an optical system and a projection space, and currently, the projection display technology has wide market and wide application in life. The lens is one of the core technologies in projection display, and has high design to processing difficulty, especially, on the premise of ensuring that the image quality and brightness are not lost, the cost and miniaturization are simultaneously considered, and in order to further improve the product performance, especially the product brightness, the lens with lower light valve bias is designed, and further improving the product performance becomes a great difficulty.
At present, the technical scheme adopted by the ultra-short focal projection lens is generally two:
the scheme I is that a plane light outlet glass is used, under the design specification of low projection ratio under low offset, the incident angle of light entering the plane light outlet glass is very large and is close to 85 degrees, but the scheme causes more light loss, and the loss of brightness and uniformity is close to 10 percent, so that the emergent angle of the lowest position of the light cannot be reduced, and the application of low offset cannot be effectively realized;
in the scheme II, a refraction and reflection mixing system is used, the projection distance can be shortened by using curved surface reflection in a reflection system section, but in order to avoid the interference problem of the height and the structure of emergent rays, the offset of a light valve is relatively large, and is usually 140% -150%; meanwhile, under the condition that the projection ratio is increased to be shorter from the traditional 0.25, namely 0.18, the angle of the light rays emitted from the lens is larger, and the height of the light rays reflected back from the diffusion screen is higher, so that the brightness of the product is affected.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings in the prior art, the present application is directed to providing a low image offset optical system, which uses curved window glass to effectively reduce the incident angle of light, improve the transmittance and uniformity, realize low light valve offset, and realize improvement in lens performance with lower cost and complexity, unlike the concept of the original reflection system.
An embodiment of the present application provides a low image offset optical system, including:
a light valve and a projection lens;
the light valve is used for providing high-resolution image light beams;
the projection lens comprises an illumination prism, an image offset mirror, a refraction system and a reflection system;
the refraction system comprises 16 lenses, wherein the refraction system comprises 4 aspherical lenses and 12 spherical lenses, and comprises a double-cemented lens, a glass aspherical lens and a triple-cemented lens;
the reflection system consists of a free-form surface reflector and curved surface light outlet glass, wherein the curved surface light outlet glass is a spherical surface, a cylindrical surface or an aspherical surface except the cylindrical surface, and is used for reducing the angle of light rays entering the glass and improving the transmittance;
when the curved surface light outlet glass is a spherical surface or a cylindrical surface, the R value of the upper surface is smaller than the R value of the lower surface; when the curved light outlet glass is an aspheric surface except a cylindrical surface, the curvature of the control edge is approximately flat.
Further, the optical system comprises an illumination prism, an image offset lens, 6 spherical lenses and 1 aspherical lens from the light valve to the aperture diaphragm, wherein the illumination prism is respectively a 1 st lens, a 2 nd lens, a 3 rd lens, a 4 th lens, a 5 th lens, a 6 th lens and a 7 th lens, the 7 th lens is an aspherical lens, and the 3 rd lens and the 4 th lens are combined into a double-cemented lens; the 5 th lens, the 6 th lens and the 7 th lens are combined into a three-cemented lens; the lens from the aperture diaphragm to the 11 th lens is the rear half part of the lens group and consists of 4 spherical lenses, namely an 8 th lens, a 9 th lens, a 10 th lens and an 11 th lens.
Further, the lens combination of the refraction system and the free-form surface reflecting mirror are the same optical axis, and the three-cemented lens and the two-cemented lens are used for correcting axial chromatic aberration and vertical chromatic aberration in the optical lens;
the three-cemented lens is used for carrying out chromatic aberration correction, and meanwhile, chromatic aberration and processability are balanced by reasonably selecting lens glass materials and optical power distribution.
Further, the Abbe number of the 5 th lens and the Abbe number of the 7 th lens are both 70-90; the Abbe number difference between the 3 rd lens and the 4 th lens is more than 30.
Further, the abbe numbers of the 3 rd lens and the 4 th lens are respectively 81.6 and 35.3, the abbe number of the 5 th lens is 81.6, and the abbe number of the 7 th lens is 76.5.
Further, the 6 th lens is distributed with negative focal power, the refractive index nd takes a value of 2.05, and the Abbe number is 26.9; the thickness of the 4 th lens and the 6 th lens is controlled to be between 0.5 mm and 1.5mm, and the thickness is used for inhibiting the reduction of the transmittance.
Further, the 3 rd lens and the 4 th lens are designed to be matched with positive and negative focal power of double convex shapes and meniscus shapes, so that positive and negative chromatic aberration generated by the positive and positive focal power of the 5 th lens is effectively corrected.
Further, a 12 th lens, a 13 th lens, a 14 th lens, a 15 th lens and a 16 th lens are sequentially arranged between the rear half part of the lens group and the reflecting system;
the 12 th lens is an independent first movable group, is used for receiving light and is matched with the 13 th lens to correct distortion and paraxial aberration;
the 13 th lens and the 14 th lens are second movable groups, complete light receiving and are used for correcting distortion and paraxial aberration by matching with the 15 th lens;
the 15 th lens and the 16 th lens are a third movable group, complete light receiving and are used for correcting distortion and paraxial aberration by matching with the free-form surface reflecting mirror;
the focal power distribution of the 1 st lens to the 16 th lens is positive, negative positive, negative, positive, negative, positive, negative positive, negative;
the first movable group, the second movable group and the third movable group expand the projection range of the optical system to 70-120 inches.
Further, the free-form surface reflecting mirror is made of plastic material, and the refractive index nd is 1.5.
Further, the refractive system and the reflective system generate positive diopters for imaging, the total length of the refractive system is L1, namely the distance from the 1 st lens to the 16 th lens, the distance between the refractive system and the reflective system is L2, and the condition that 0.5 < L1/L2 < 1.0 is satisfied.
Compared with the prior art, the application has the beneficial effects that:
1. the light valve offset is low, and 107% of the light valve offset can be realized;
2. the product has good performance, the uniformity index is superior to all the schemes in the market, can reach more than 90 percent, and has higher brightness;
3. the manufacturability is high, the optical system is realized by using 16 lenses and one free-form surface reflecting mirror, the tolerance of single lens allocation is balanced, and the production yield is more than 90 percent;
4. the projection ratio is shorter, and the projection ratio is within TR 0.18;
5. the color difference is 650 nm-450 nm and can reach within 0.35 pixel.
The optical system has compact integral mechanism, realizes high-resolution imaging quality through the aperture diaphragm, the spherical lens, the cemented lens, the free-form surface reflecting mirror and reasonable material collocation, is particularly provided with the self-form surface light outlet glass, effectively balances the requirements on performance and volume under the conditions of ultra-short projection ratio (TR 0.18), lower offset and larger wavelength range, and improves the mass productivity of the lens.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a low image bias optical system according to the present application;
FIG. 2 is an image of the overall effect of the optical system of the present application;
fig. 3 is a TV distortion schematic of an imaging picture of an optical system in an embodiment of the present application;
FIG. 4 is a graph showing light spots under different field conditions on an imaging frame in an embodiment of the present application;
fig. 5 is a light ray fan diagram in an embodiment of the application.
Reference numerals:
1. light valve, 2, illumination prism, 3, image offset mirror, 401, 1 st lens, 402, 2 nd lens, 403, 3 rd lens, 404, 4 th lens, 405, 5 th lens, 406, 6 th lens, 407, 7 th lens, 408, 8 th lens, 409, 9 th lens, 410, 10 th lens, 411, 11 th lens, 412, 12 th lens, 413, 13 th lens, 414, 14 th lens, 415, 15 th lens, 416, 16 th lens, 5, aperture stop, 6, free-form surface mirror, 7, curved light exit glass.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The application provides a low image bias optical system, which comprises a light valve 1 and a projection lens. The light valve 1 is used for providing high-resolution image light beams; the projection lens comprises a refraction system and a reflection system; the reflection system is constituted by a free-form surface.
Fig. 1 is a schematic structural diagram of a low image offset optical system according to the present application, where a projection lens includes an illumination prism 2, an image offset mirror 3, a refraction system and a reflection system; the projection lens projects an image beam of the light valve 1 onto a screen to form an image.
The application can project a large picture in a short distance, has lower offset and realizes the projection imaging quality with high resolution.
Specifically, the light valve 1 is a DMD chip or an LCoS chip, the light valve 1 is a light modulation element, and an illumination prism 2 is further provided between the light valve 1 and the projection lens, and the illumination prism 2 is a TIR total reflection prism, so as to improve brightness and contrast of light entering the lens from the light valve 1.
The projection lens comprises a refraction system and a reflection system.
The refraction system comprises 16 lenses, wherein the refraction system comprises 4 aspherical lenses and 12 spherical lenses, and comprises a double-cemented lens, a glass aspherical lens and a triple-cemented lens;
the reflection system consists of a free-form surface reflector 6 and a curved surface light outlet glass 7; the curved surface light outlet glass 7 can be spherical, cylindrical, aspherical except the cylindrical, etc.; the angle of the emergent light entering the glass can be effectively reduced by using the curved surface light emergent glass 7, so that high transmittance is realized.
Specifically, when the curved surface light outlet glass 7 is used, errors of distortion, analysis and ghosting are introduced, and the curvature design for eliminating the ghosting is required for the curvature of the special curved surface; when the curved surface light outlet glass 7 is a sphere or a cylinder, the R value of the upper surface needs to be smaller than the R value of the lower surface; when the curved light-emitting glass 7 is an aspherical surface other than a cylindrical surface, it is necessary to control the curvature of the edge to be nearly flat, thereby effectively eliminating ghosts.
Specifically, the optical system comprises 1 illumination prism 2,1 image offset lens 3,6 spherical surfaces and 1 aspherical mirror from the light valve 1 to the aperture stop 5, wherein the 1 st lens 401, the 2 nd lens 402, the 3 rd lens 403, the 4 th lens 404, the 5 th lens 405, the 6 th lens 406 and the 7 th lens 407 are respectively, the 7 th lens 407 is an aspherical mirror, and the 3 rd lens 403 and the 4 th lens 404 are combined into a double-cemented lens; the 5 th lens 405, the 6 th lens 406, and the 7 th lens 407 are combined into one triple cemented lens; the aperture stop 5 to the 11 th lens are the rear half of the lens group, and are composed of 4 spherical lenses, namely an 8 th lens 408, a 9 th lens 409, a 10 th lens 410 and an 11 th lens 411.
The lens combination of the refraction system and the free-form surface reflecting mirror 6 are all the same optical axis; wherein the two-cemented lens and the three-cemented lens play a key role in correcting the chromatic aberration of the system. Specifically, the double cemented lens and the triple cemented lens mainly correct axial chromatic aberration and vertical chromatic aberration in the optical lens.
In the refraction system, three cemented lenses are core elements, glass materials and focal power distribution are reasonably selected while aberration correction is carried out, aberration and processability are effectively balanced, the three cemented lenses are mainly used for correcting chromatic aberration, materials with larger Abbe number difference are preferably selected for matching, wherein Abbe number of the 5 th lens 405 and Abbe number of the 7 th lens 407 are both 70-90, and in practical application, abbe number of the 5 th lens 405 is 81.6, abbe number of the 7 th lens 407 is 76.5; since the 6 th lens 406 distributes negative power and a material with a larger refractive index is selected, aberrations such as spherical aberration, coma, astigmatism and the like of the lens are reduced by neutralizing the high refractive index negative power of the 4 th lens 404. In general, the higher the refractive index is, the more the blue light is absorbed, and the light transmittance is reduced, so the thicknesses of the 4 th lens 404 and the 6 th lens 406 need to be controlled to be 0.5-1.5 mm in design, the reduction of the transmittance is inhibited, and in practical application, the refractive index of the 6 th lens 406 takes a value of 2.05 and the abbe number is 26.9;
the 3 rd lens 403 and the 4 th lens 404 form a double-cemented lens, wherein the Abbe number difference between the 3 rd lens 403 and the 4 th lens 404 is required to be more than 30; in the wavelength range of 650 nm-450 nm, the residual chromatic aberration of the lens can be effectively controlled by selecting the value. In practical application, abbe numbers of the 3 rd lens 403 and the 4 th lens 404 are respectively 81.6 and 35.3, and positive and negative focal powers are matched by respectively designing the 3 rd lens 403 and the 4 th lens 404 into a double convex shape and a meniscus shape, and positive and negative chromatic aberration is generated on positive and positive focal powers of the 5 th lens 405 to realize an effective correction effect.
The 12 th lens 412 is a single first movable group, and is configured to receive light and correct distortion and paraxial aberration in cooperation with the 13 th lens 413.
The 13 th lens 413 and the 14 th lens 414 are second movable groups, and are used for correcting distortion and paraxial aberration in cooperation with the 15 th lens 415.
The 15 th lens 415 and the 16 th lens 416 are the third movable group, and are used to correct distortion and paraxial aberration in cooperation with the free-form surface mirror 6.
The first movable group, the second movable group and the third movable group can expand the projection range of the lens to 70-120 inches according to a specific movement curve.
Wherein the free-form surface reflector 6 is made of plastic material, and the refractive index nd is 1.5. Because the reflector is far away from the diaphragm, the field of view is larger, and the addition of the aspheric surface can greatly reduce the system distortion aberration.
In optical system imaging, there are mainly 5 kinds of monochromatic aberrations of spherical aberration, coma, astigmatism, field curvature, distortion, and 2 kinds of chromatic aberration of axial chromatic aberration and vertical chromatic aberration. In optical system imaging, the focal power of the lens can directly influence astigmatism, field curvature, distortion, axial chromatic aberration and vertical chromatic aberration, so that different positive and negative focal power collocations can play a certain role in aberration correction. The power distribution of the 1 st lens 401 to the 16 th lens 416 in the present application is positive, positive negative, positive, negative, positive, negative positive, negative; in the application, the total focal power of the refraction system is positive focal power, and the reflection system is also positive focal power.
The refractive system and the reflective system produce positive diopters (positive diopters being the fundamental condition for imaging), the total length of the refractive system is L1 (distance from lens 1 to lens 16, lens 416), the spacing between the refractive system and the reflective system is L2, and the conditional expression 0.5 < L1/L2 < 1.0 is satisfied to reduce the volume. The 16 th lens 416 is an aspherical lens.
In the technical scheme of the application, the equivalent focal length of the projection lens is F1, the equivalent focal length of the refraction system is F2, and the equivalent focal length of the reflection system is F3, and the application satisfies the following conditional expression: 20< |F2/F1| < 30;5 < |F3/F1| < 15;
in the technical scheme of the application, the distance from the 1 st lens 401 to the 1 st surface of the light valve, namely the rear working distance of the lens, is recorded as BFL and accords with the conditional expression:
0< BFL/ (L1+L2) < 0.5
so as to meet the ultra-short focal characteristics of the lens.
The offset of the projection lens from the pixel surface of the light valve 1 to the optical axis satisfies the relation:
107%< offset <150%。
when the projection picture of the projection lens is 100 inches, the linear relation between the linear distance of the free-form surface reflecting mirror 6 and the screen and the length of the projection picture is that: the projection distance/screen length size is less than or equal to 0.18, namely the projection ratio.
In a specific embodiment of the present application, the projection lens structure parameters satisfy the following conditions: effective Focal Length (EFL) =1.67 mm, offset of 107% < offset <150%, resolution of 93lp/mm, projected screen of 70-120 inches, transmittance of 0.15-0.18. Fig. 2 to 5 are each a graph of the image quality evaluation related to this embodiment.
Fig. 2 is an overall imaging effect diagram of an optical system, which includes a light valve 1, an illumination prism 2, an image offset mirror 3, a refraction system, a reflection system, a screen and an overall light direction diagram.
FIG. 3 is a schematic view of TV distortion of an image of an optical system, from which it can be seen that when the projected image is 100 inches (2214X 1245mm 2 ) At this time, the maximum value of TV distortion is 0.31% (usually < 0.5%) and is required.
Fig. 4 is a schematic view of spot light under different view field conditions on an imaging frame, wherein the schematic view is a spot light imaging schematic view of three different wavelength light rays (0.45 μm, 0.55 μm and 0.647 μm) on a screen under a certain view field condition on the premise of normalizing the different view field conditions.
Fig. 5 is a graph of the optical fan showing the aberration values between three wavelengths (0.45 μm, 0.55 μm, 0.647 μm) and the dominant wavelength light in the x-axis and y-axis, respectively, under the normalized respective field conditions. The 10 graphs thereof represent normalized 10 fields of view, respectively; the two charts in each view field are respectively an x axis and a y axis which are symmetrical by taking the optical axis as a center in the projection lens; the horizontal axis direction in each graph is the pupil height position under the field of view condition, and the vertical axis direction is the error between the light rays of the respective wavelengths and the principal ray.
The technical scheme of the application is a secondary imaging architecture, the pixel surface of the light valve 1 is an object plane, after the light valve 1 reflects the light beam and passes through the refraction system, the first imaging is carried out between the reflection system and the refraction system, the first imaging is carried out after the light beam forms a convergence point, namely the first imaging is carried out, after the first imaging is reflected by the curved surface of the free-form surface reflector 6, a secondary undistorted image is formed on the screen, the secondary imaging is carried out, and a large-size projection image is displayed on the projection screen; as can be seen from the ray diagram, the lens after the position of the aperture stop 5 is a biconvex lens, i.e. the 8 th lens 408.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements.
It should also be noted that the positional or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present application and its core ideas. The foregoing is merely illustrative of the preferred embodiments of this application, and it is noted that there is objectively no limit to the specific structure disclosed herein, since numerous modifications, adaptations and variations can be made by those skilled in the art without departing from the principles of the application, and the above-described features can be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present application.
Claims (10)
1. A low image offset optical system, comprising:
a light valve and a projection lens;
the light valve is used for providing high-resolution image light beams;
the projection lens comprises an illumination prism, an image offset mirror, a refraction system and a reflection system;
the refraction system comprises 16 lenses, wherein the refraction system comprises 4 aspherical lenses and 12 spherical lenses, and comprises a double-cemented lens, a glass aspherical lens and a triple-cemented lens;
the reflection system consists of a free-form surface reflector and curved surface light outlet glass, wherein the curved surface light outlet glass is a spherical surface, a cylindrical surface or an aspherical surface except the cylindrical surface, and is used for reducing the angle of light rays entering the glass and improving the transmittance;
when the curved surface light outlet glass is a spherical surface or a cylindrical surface, the R value of the upper surface is smaller than the R value of the lower surface; when the curved light outlet glass is an aspheric surface except a cylindrical surface, the curvature of the control edge is approximately flat.
2. The low image offset optical system according to claim 1, wherein the optical system comprises an illumination prism, an image offset mirror, and 6 spherical mirrors and 1 aspherical mirror, respectively, 1 st lens, 2 nd lens, 3 rd lens, 4 th lens, 5 th lens, 6 th lens and 7 th lens, wherein the 7 th lens is an aspherical mirror, and wherein the 3 rd lens and the 4 th lens are combined into a double cemented lens; the 5 th lens, the 6 th lens and the 7 th lens are combined into a three-cemented lens; the lens from the aperture diaphragm to the 11 th lens is the rear half part of the lens group and consists of 4 spherical lenses, namely an 8 th lens, a 9 th lens, a 10 th lens and an 11 th lens.
3. The low image offset optical system according to claim 2, wherein the lens combination of the refraction system and the free-form surface reflecting mirror are the same optical axis, and the three-cemented lens and the two-cemented lens are used for correcting axial chromatic aberration and vertical chromatic aberration in the optical lens;
the three-cemented lens is used for carrying out chromatic aberration correction, and meanwhile, chromatic aberration and processability are balanced by reasonably selecting lens glass materials and optical power distribution.
4. The low image offset optical system according to claim 2, wherein the abbe number of the 5 th lens and the abbe number of the 7 th lens are both 70-90; the Abbe number difference between the 3 rd lens and the 4 th lens is more than 30.
5. The low image bias optical system according to claim 4, wherein abbe numbers of the 3 rd lens and the 4 th lens are 81.6 and 35.3, respectively, abbe number of the 5 th lens is 81.6, and abbe number of the 7 th lens is 76.5.
6. The low image bias optical system according to claim 2, wherein the 6 th lens is assigned negative power, and the refractive index nd is 2.05 and the abbe number is 26.9; the thickness of the 4 th lens and the 6 th lens is controlled to be between 0.5 mm and 1.5mm, and the thickness is used for inhibiting the reduction of the transmittance.
7. The low image offset optical system according to claim 2, wherein the 3 rd lens and the 4 th lens are designed to be matched with positive and negative focal powers of biconvex shape and meniscus shape, so as to effectively correct positive and negative chromatic aberration generated by the positive focal power of the 5 th lens.
8. The low image offset optical system according to claim 2, wherein a 12 th lens, a 13 th lens, a 14 th lens, a 15 th lens, and a 16 th lens are sequentially disposed between the rear half of the lens group and the reflection system;
the 12 th lens is an independent first movable group, is used for receiving light and is matched with the 13 th lens to correct distortion and paraxial aberration;
the 13 th lens and the 14 th lens are second movable groups, complete light receiving and are used for correcting distortion and paraxial aberration by matching with the 15 th lens;
the 15 th lens and the 16 th lens are a third movable group, complete light receiving and are used for correcting distortion and paraxial aberration by matching with the free-form surface reflecting mirror;
the focal power distribution of the 1 st lens to the 16 th lens is positive, negative positive, negative, positive, negative, positive, negative positive, negative;
the first movable group, the second movable group and the third movable group expand the projection range of the optical system to 70-120 inches.
9. The low image bias optical system according to claim 8, wherein the free-form surface mirror is made of plastic material, and the refractive index nd is 1.5.
10. The low image bias optical system according to claim 1, wherein the refractive system and the reflective system generate positive diopters for imaging, the total length of the refractive system is L1, i.e. the distance from the 1 st lens to the 16 th lens, the distance between the refractive system and the reflective system is L2, and the refractive system and the reflective system are in compliance with the condition 0.5 < L1/L2 < 1.0.
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