CN114545713B - Projection optical system and electronic equipment - Google Patents
Projection optical system and electronic equipment Download PDFInfo
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- CN114545713B CN114545713B CN202111671867.6A CN202111671867A CN114545713B CN 114545713 B CN114545713 B CN 114545713B CN 202111671867 A CN202111671867 A CN 202111671867A CN 114545713 B CN114545713 B CN 114545713B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 117
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- 238000003384 imaging method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000005357 flat glass Substances 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012634 optical imaging Methods 0.000 description 4
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Lenses (AREA)
Abstract
The application discloses a projection optical system and electronic equipment. The projection optical system includes, in order from an enlargement side to a reduction side: a curved mirror, a first lens group, and a second lens group; the focal power of the first lens group is negative, and the focal power of the second lens group is positive; the first lens group comprises a moving lens group which can move along an optical axis; the moving lens group comprises a second lens and a third lens, and the optical powers of the second lens and the third lens are opposite.
Description
Technical Field
The present application relates to the technical field of optical devices, and more particularly, to a projection optical system and an electronic apparatus.
Background
In recent years, with the development of projection technology, projectors have been widely used in various scenes, wherein ultra-short-focus projection apparatuses are widely used in fields such as home use and office use due to the large projection screen.
Conventional ultra-short focal lenses typically divide the lens into 3-4 lens group components, which require simultaneous movement of 2-3 lens group components in order to achieve different throw distance focusing. The greater the number of movable lens group parts, the more mechanical structures are required to adjust or to make the lens more complex in focusing procedure. In addition, when the size of a projection picture is enlarged, the picture of the existing ultra-short focal lens is distorted, and the picture quality is affected.
Disclosure of Invention
An object of the present application is to provide a projection optical system and a new technical scheme of an electronic device.
According to a first aspect of an embodiment of the present application, there is provided a projection optical system. The method sequentially comprises the following steps from an enlargement side to a reduction side: a curved mirror, a first lens group, and a second lens group;
The focal power of the first lens group is negative, and the focal power of the second lens group is positive;
the first lens group comprises a moving lens group which can move along an optical axis;
the moving lens group comprises a second lens and a third lens, and the optical powers of the second lens and the third lens are opposite.
Optionally, the first lens group further comprises a fixed lens group, the fixed lens group being located between the curved mirror and the moving lens group;
The fixed lens group includes at least one fourth lens having negative optical power.
Optionally, the second lens group includes: a diaphragm, a fifth lens and a sixth lens located on a first side of the diaphragm, a seventh lens and an eighth lens located on a second side of the diaphragm, and at least two sets of cemented lenses located between the seventh lens and the eighth lens; the first side is opposite to the second side, and the first side is closer to the first lens group;
The fifth lens and the sixth lens are aspheric lenses;
The eighth lens is further away from the diaphragm than the seventh lens, and is an aspheric lens.
Optionally, the optical powers of the fifth lens and the sixth lens are opposite.
Optionally, the refractive index Nd of the fifth lens is less than 1.7; the refractive index Nd of the sixth lens is less than 1.7.
Optionally, the seventh lens is an aspherical lens.
Optionally, a twelfth lens, a thirteenth lens, a fourteenth lens and a fifteenth lens are sequentially arranged between the seventh lens and the eighth lens; the two groups of cemented lenses comprise a first cemented lens and a second cemented lens;
the twelfth lens is connected with the thirteenth lens in a gluing way to form a first gluing lens;
The fourteenth lens and the fifteenth lens are connected in a gluing way to form a second gluing lens.
Optionally, the optical powers of the twelfth lens and the thirteenth lens are opposite; the tenth lens has an optical power opposite to that of the fifteenth lens.
Optionally, the second lens group includes, in order from an enlargement side to a reduction side: a ninth lens, a tenth lens, a fifth lens, a sixth lens, an eleventh lens, a seventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, and an eighth lens, wherein a diaphragm is arranged between the eleventh lens and the seventh lens;
The optical power ordering of the second lens group is as follows: positive negative positive/negative positive.
Optionally, the fifth lens, the sixth lens and the eighth lens are all aspheric lenses.
Optionally, the twelfth lens is connected with the thirteenth lens in a gluing way to form a first glued lens;
The fourteenth lens and the fifteenth lens are connected in a gluing way to form a second gluing lens.
Optionally, the curved mirror is a concave mirror.
Optionally, the second lens and the third lens are bonded together to form a third bonded lens.
According to a second aspect of an embodiment of the present application, there is provided an electronic device. The electronic device comprises the projection optical system of the first aspect.
The technical effect of the application is that in the embodiment of the application, a projection optical system is provided, and the projection ratio can be reduced and the picture quality can be improved through the combination and collocation of the curved reflector, the first lens group and the second negative focal power lens group; in addition, focusing of the projection optical system is realized through a group of movable lens groups, and the complexity and the operation difficulty of the projectable optical system are reduced.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a block diagram showing a projection optical system according to an embodiment of the present application.
Fig. 2 a-2 f are beam fans of a projection optical system according to an embodiment of the application.
Fig. 3 is a diagram showing a modulation transfer function of a projection optical system according to an embodiment of the present application.
Fig. 4 is a field diagram of a projection optical system according to an embodiment of the application.
Fig. 5 is a distortion chart of a projection optical system according to an embodiment of the present application.
Fig. 6 is a schematic view of a lateral color of the projection optical system on the image side according to the present embodiment.
Reference numerals illustrate:
1. A curved mirror;
2. a first lens group; 21. a second lens; 22. a third lens; 20. a fourth lens;
3. A second lens group; 30. a fifth lens; 31. a sixth lens; 32. a seventh lens; 33. an eighth lens; 38. a ninth lens; 39. a tenth lens; 40. an eleventh lens; 34. a twelfth lens; 35. a thirteenth lens; 36. a fourteenth lens; 37. a fifteenth lens;
4. a diaphragm; 5. vibrating mirror; 6. a prism; 7. a sheet glass; 8. and an image source.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In a first aspect of an embodiment of the present application, a projection optical system is provided. In this embodiment, the projection optical system is an ultra-short focal projection lens. The projection optical system is applied to a projector or an illumination light machine.
Referring to fig. 1, the projection optical system includes, in order from an enlargement side to a reduction side: a curved mirror 1, a first lens group 2 and a second lens group 3.
The focal power of the first lens group 2 is negative, and the focal power of the second lens group 3 is positive.
The first lens group 2 includes a moving lens group movable along an optical axis. The moving lens group includes a second lens 21 and a third lens 22, and the optical powers of the second lens 21 and the third lens 22 are opposite.
In other words, the projection optical system includes, in order from the enlargement side to the reduction side: a curved mirror 1, a first lens group 2 and a second lens group 3. The first lens group 2 is located at the light-emitting side of the second lens group 3, and the curved mirror 1 is located at the light-emitting side of the first lens group 2. The curved mirror 1 receives the light emitted from the first lens group 2, and projects the light onto the screen through the curved mirror 1.
The curved mirror 1 serves as a first lens of the projection optical system. The curved mirror 1 is used for reducing the projection ratio and compensating the aberration, thereby improving the picture quality. Specifically, the ultra-short focal projection lens is designed to achieve a minimum throw ratio throw distance/screen width, and the present embodiment uses reflection to reduce throw distance. For example, the curved mirror may be a reflective convex mirror or a reflective concave mirror.
In this embodiment, the zoom projection lens further includes a prism 6, a plate glass 7, and an image source 8. In use, the second lens group 3 is located on the light-emitting side of the image source 8, and in this embodiment, the plate glass 7 is configured to receive the light emitted from the image source 8, and the prism 6 is configured to receive the light emitted from the plate glass 7. The second lens group 3 receives the light emitted from the prism 6.
In this embodiment, the image source 8 provides an image beam. The image source 8 is a reflective light modulator such as a liquid crystal silicon (lc) panel (Liquid Crystal On Silicon panel), a Digital Micro-mirror Device (DMD), or the like. In other embodiments, the image source 8 may also be a transparent liquid crystal panel (TRANSPARENT LIQUID CRYSTAL PANEL), an Electro-Optic Modulator (Electro-Optical Modulator), a Magneto-Optic Modulator (Magneto-Optic Modulator), an acousto-Optic Modulator (Acousto-Optic Modulator, AOM), or the like. For example, the collocated image source 8 uses a texas instrument DMD. The embodiment of the present application is not limited to the type and kind of the image source 8.
Specifically, the first lens group 2 is located on the light-emitting side of the second lens group 3. The first lens group 2 receives the emitted light of the second lens group 3. The first lens group 2 compensates for picture quality.
The first lens group 2 includes a moving lens group movable along the optical axis. The moving lens group compensates the adjusted picture, and the moving lens group plays a role in focusing. In use, after the distance between the projection optical system and the screen is changed, focusing can be performed by moving the lens group, thereby realizing focusing imaging so as to further adjust the picture quality.
In the present embodiment, the moving lens group includes a second lens 21 and a third lens 22. The second lens 21 and the third lens 22 have opposite optical powers. For example, the optical power of the second lens 21 is positive, and the optical power of the third lens 22 is negative; or the optical power of the second lens 21 is negative and the optical power of the third lens 22 is positive. In the present embodiment, as shown with reference to fig. 1, the optical power of the second lens 21 is positive, the surface of the second lens 21 near the magnification side is convex, and the surface of the second lens 21 far from the magnification side is convex. The optical power of the third lens 22 is negative, the surface of the third lens 22 adjacent to the second lens 21 is a concave surface, and the surface of the third lens 22 away from the second lens 21 is a concave surface.
In this embodiment, the frame is compensated by a set of moving lens groups. Compared with the prior art that focusing can be achieved by moving 2-3 groups of components simultaneously, in the embodiment, a group of moving lenses are applied to the projection optical system, so that the complexity of the projection optical system can be reduced while focusing is achieved, and convenience is brought to user operation and use. On the other hand, the volume of the projection optical system is also reduced, and the portable optical system is convenient for users to carry.
In one embodiment, the projection optical system further includes a galvanometer 5, the galvanometer 5 being disposed at an outgoing side of the light of the prism 6, the galvanometer 5 projecting the light to the second lens group 3.
In this embodiment, the galvanometer 5 combines with an XPR technique of Texas instruments research to promote the image source 8 to shake rapidly at a speed several times higher than the human eye vision to realize the duplication of pixels, and finally to be presented in an imaging mode of 4 times that of the original pixels, so as to improve the quality of the pixels and the resolution of the picture, for example, the picture can be raised from 1080P to 4K.
In one embodiment, referring to fig. 1, the first lens group 2 further includes a fixed lens group, the fixed lens group being located between the curved mirror 1 and the moving lens group; the fixed lens group includes at least one fourth lens 20 having negative optical power.
In this embodiment, the fixed lens group is used to adjust the quality of the picture. After the projection optical system is assembled, the fixed lens group is fixed in the projection optical system.
Referring to fig. 1, the fixed lens group in this embodiment includes a piece of fourth lens 20, and the fourth lens 20 has negative optical power. The surface of the fourth lens 20 adjacent to the curved mirror 1 is a concave surface, and the surface of the fourth lens 20 adjacent to the second lens 21 is a concave surface.
In the present embodiment, the moving lens group is located between the fixed lens group and the second lens group 3, the distance between the fixed lens group and the second lens group 3 is constant, and the moving lens group moves back and forth between the fixed lens group and the second lens group 3. The moving lens group can be used at different modulations Jiao Checun (80 "-120") to compensate for the picture.
In this embodiment, the arrangement of the lenses may be very sensitive in the field of ultra-short focal projection lens applications. The fixed lens group is positioned between the curved reflector 1 and the movable lens group, and the picture quality is maintained through the cooperation of the fixed lens group and the movable lens group. In the first lens group, if the positions between the fixed lens group and the movable lens group are exchanged, the image quality is adversely affected.
In one embodiment, the refractive power of the curved mirror 1 ranges from: 25-35; the diopter range of the first lens group 2 is: -200 to-400; the second lens group 3 has diopter ranges of: 10.5 to 12.5.
In this embodiment, the optical quality of the projection optical system can be improved by limiting the diopter of the curved mirror 1, the diopter of the first lens group 2, and the diopter of the second lens group 3.
For example, the diopter of the first lens 1 is defined as 27.93, the diopter of the first lens group is defined as-306.74, and the diopter of the second lens group is defined as 11.77, so that the effective focal distance of the projection optical system is 2.033, the field angle of the projection optical system is 155.9 ° (ultra wide angle is realized), the projection ratio of the projection optical system is 0.21, and the image space telecentricity CRA angle is less than 1 °. The image produced by the projection optical system has the characteristics of high quality, high stability and low distortion.
In one embodiment, referring to fig. 1, the second lens group includes: a diaphragm 4, a fifth lens 30 and a sixth lens 31 located on a first side of the diaphragm 4, a seventh lens 32 and an eighth lens 33 located on a second side of the diaphragm 4, and at least two sets of cemented lenses located between the seventh lens 32 and the eighth lens 33; the first side is opposite to the second side, and the first side is closer to the first lens group 2;
the fifth lens 30 and the sixth lens 31 are both aspherical lenses.
The eighth lens 33 is further away from the diaphragm 4 than the seventh lens 32, and the eighth lens 33 is an aspherical lens.
In the present embodiment, the second lens group 3 is used to adjust the quality of the picture. When the projection optical system is assembled, the second lens group 3 is stationary inside the projection optical system.
In this embodiment, the second lens group 3 can ensure uniformity of an image frame. For example, f1.7 is used as the diaphragm 4, and the more the amount of light is fed into the diaphragm 4, the higher the brightness of the imaged picture is.
In this embodiment, the fifth lens 30 and the sixth lens 31 are located on the front side of the diaphragm 4, and the seventh lens 32 and the eighth lens 33 are located on the rear side of the diaphragm 4. Namely, the fifth lens 30 and the sixth lens 31 are located on the stop 4 side and are disposed close to the magnification side; the seventh lens 32 and the eighth lens 33 are located on the other side of the diaphragm 4 and are disposed away from the magnification side.
In this embodiment, the fifth lens 30, the sixth lens 31, and the eighth lens 33 are all aspherical lenses. Specifically, the more aspherical lenses can be designed to obtain better picture quality, but the more aspherical lenses are assembled, the more sensitive is the assembly tolerance, so the fifth lens 30, the sixth lens 31 and the eighth lens 33 are all aspherical lenses in the present embodiment in balancing picture quality and mass productivity in designing.
In this embodiment, with the combined use of the fifth lens 30, the sixth lens 31, and the eighth lens 33, the edge large-angle spherical aberration and the aberration can be reduced, thereby improving the picture quality.
In the present embodiment, at least two groups of cemented lenses are disposed between the seventh lens 32 and the eighth lens 33, and the chromatic aberration of the picture is reduced and the sensitivity of the picture is reduced by the two groups of cemented lenses as compared with the case where one group of cemented lenses is disposed in the projection optical system in the related art, so as to improve the picture quality.
In this embodiment, the second lens group 3 includes two aspherical lenses located at the diaphragm 4, one aspherical lens located at the rear side of the diaphragm 4, and the aspherical lens located at the rear side of the diaphragm 4 is disposed closer to the image source 8. Meanwhile, at least two sets of cemented lenses are provided between the seventh lens 32 and the eighth lens 33 located on the rear side of the diaphragm 4. By arranging and combining the fifth lens 30, the sixth lens 31, the seventh lens 32 and the eighth lens 33, and the two groups of cemented lenses between the seventh lens 32 and the eighth lens 33, the projection optical system can reduce the projection ratio on the one hand, realize ultra-short focal projection, and further improve the picture quality on the other hand.
In one embodiment, referring to fig. 1, the optical powers of the fifth lens 30 and the sixth lens 31 are opposite.
In this embodiment, the fifth lens 30 and the sixth lens 31 are located on the front side of the diaphragm 4. In use, the fifth lens 30 and the sixth lens 31 are disposed away from the image source 8. The present embodiment defines that the fifth lens 30 and the sixth lens 31 have opposite optical powers. That is, the optical power of the fifth lens 30 is positive, and the optical power of the sixth lens 31 is negative; or the optical power of the fifth lens 30 is negative and the optical power of the sixth lens 31 is positive.
Referring to fig. 1, the optical power of the fifth lens 30 is negative, the surface of the fifth lens 30 near the magnification side is convex, and the surface of the fifth lens 30 far from the magnification side is concave. The optical power of the sixth lens 31 is positive, the surface of the sixth lens 31 close to the magnification side is a convex surface, and the surface of the sixth lens 31 away from the magnification side is a plane surface.
If a lens is provided in front of the diaphragm 4, the image formed under high temperature conditions is easily blurred (out of focus), and the image quality is reduced. When the sixth lens 31 and the fifth lens 30 with opposite optical powers are used in combination, the effect of temperature on the fifth lens 30 and the sixth lens 31 is reduced by counteracting a positive diopter and a negative diopter.
In one embodiment, the refractive index Nd of the fifth lens 30 is < 1.7; the refractive index Nd of the sixth lens 31 is less than 1.7.
Specifically, the refractive index range of the fifth lens 30 is: 1.48 to 1.7; the refractive index range of the sixth lens 31 is: 1.48-1.7. The refractive index of the fifth lens 30 and the sixth lens 31 is limited in this embodiment, and the fifth lens 30 and the sixth lens 31 may be plastic lenses or glass lenses.
Referring to fig. 1, the image source 8 generates heat during operation. The fifth lens 30 and the sixth lens 31 are disposed away from the image source 8, and the seventh lens 32 and the eighth lens 33 are disposed close to the image source 8. Namely, the fifth lens element 30 and the sixth lens element 31 are disposed at positions away from the heating area, and the material of the aspherical lens element disposed away from the heating area is selected to be plastic, so that the deformation influence of heat on the lens element (the plastic material is more sensitive to temperature) can be reduced, and the preparation cost of the product can be reduced. The lens arranged close to the heating area is made of glass materials, so that the influence of heat on the deformation of the lens can be reduced.
In one embodiment, referring to fig. 1, the seventh lens 32 is an aspherical lens.
In this embodiment, the fifth lens 30 and the sixth lens 31 located on the front side of the diaphragm 4 are both aspheric lenses, and the seventh lens 32 and the eighth lens 33 defined on the rear side of the diaphragm 4 are both aspheric lenses, so that the edge large-angle spherical aberration and the aberration can be further reduced, and the picture quality can be further improved.
In one embodiment, referring to fig. 1, a twelfth lens 34, a thirteenth lens 35, a fourteenth lens 36, and a tenth lens 37 are sequentially disposed between the seventh lens 32 and the eighth lens 33; the two groups of cemented lenses comprise a first cemented lens and a second cemented lens;
The twelfth lens 34 is connected with the thirteenth lens 35 in a gluing way to form a first gluing lens; the fourteenth lens 36 is cemented with the fifteenth lens 37 to form a second cemented lens.
Specifically, the twelfth lens 34 and the thirteenth lens 35 are cemented to form a first cemented lens. The fourteenth lens 36 and the fifteenth lens 37 are cemented to form a second cemented lens. The first and second cemented lenses further reduce chromatic aberration and sensitivity, thereby improving picture quality.
In a specific embodiment, the twelfth lens 34 and the thirteenth lens 35 may be spherical lenses, and the twelfth lens 34 and the thirteenth lens 35 are glued, so that on one hand, the picture quality can be improved; on the other hand, the manufacturing is convenient, and the manufacturing cost is reduced.
In a specific embodiment, the fourteenth lens 36 and the fifteenth lens 37 may be spherical lenses, and the fourteenth lens 36 and the fifteenth lens 37 are glued, so that on one hand, the picture quality can be improved; on the other hand, the manufacturing is convenient, and the manufacturing cost is reduced.
In one embodiment, as shown with reference to fig. 1, the optical powers of the twelfth lens 34 and the thirteenth lens 35 are opposite. The fourteenth lens 36 has an optical power opposite to that of the fifteenth lens 37.
Specifically, the optical power of the twelfth lens 34 is positive, and the optical power of the thirteenth lens 35 is negative. Or the optical power of the twelfth lens 34 is negative and the optical power of the thirteenth lens 35 is positive. The optical power of the fourteenth lens 36 is positive, and the optical power of the fifteenth lens 37 is negative. The optical power of the fourteenth lens 36 is negative, and the optical power of the fifteenth lens 37 is positive.
Referring to fig. 1, the twelfth lens 34 has positive power, a surface of the twelfth lens 34 disposed adjacent to the seventh lens is concave, and a surface of the twelfth lens 34 distant from the seventh lens is convex. The thirteenth lens 35 has negative power, a surface of the thirteenth lens 35 disposed adjacent to the twelfth lens 34 is concave, and a surface of the thirteenth lens 35 distant from the twelfth lens 34 is convex.
The fourteenth lens 36 has positive optical power, and a surface of the fourteenth lens 36 close to the thirteenth lens is convex, and a surface of the fourteenth lens 36 distant from the thirteenth lens 35 is convex. The fifteenth lens 37 has negative power, a surface of the fifteenth lens 37 close to the fourteenth lens 36 is concave, and a surface of the fifteenth lens 37 distant from the fourteenth lens 36 is convex.
In this embodiment, the picture quality is maintained by the cooperative use of the twelfth lens 34, thirteenth lens 35, fourteenth lens 36, and fifteenth lens 37.
In this embodiment, the second lens group 3 includes, in order from the enlargement side to the reduction side: a ninth lens 38, a tenth lens 39, a fifth lens 30, a sixth lens 31, an eleventh lens 40, a seventh lens 32, a twelfth lens 34, a thirteenth lens 35, a fourteenth lens 36, a fifteenth lens 37, an eighth lens 33, a diaphragm 4 being provided between the eleventh lens 40 and the seventh lens 32;
The focal power sequence of the second lens group 3 is as follows: positive negative positive/negative positive.
In this embodiment, the optical power of the lenses in the second lens group is defined so that the optical power distribution of the lenses in the second lens group 3 is uniform, enabling the distortion characteristics of the imaged picture to be repaired.
Further, the first lens group 2 includes a fourth lens 20, a second lens 21, and a third lens 22 in this order from the enlargement side to the reduction side. The power order of the first lens group 2 is negative and positive.
The second lens 21 and the third lens 22 are movable lens groups, the second lens 21 and the third lens 22 can move back and forth along the optical axis, and the focal length of the whole lens group can be adjusted by moving the position of the movable lens groups, so that the definition of pictures with different projection sizes can be adjusted conveniently by a user to ensure the projection effect of the pictures.
In one embodiment, referring to fig. 1, the fifth lens 30, the sixth lens 31 and the eighth lens 33 are all aspheric lenses. The embodiment can reduce the edge large-angle spherical aberration and the aberration, thereby improving the picture quality.
In one embodiment, referring to fig. 1, the twelfth lens 34 is bonded to the thirteenth lens 35 to form a first bonded lens; the twelfth lens 34 is bonded to the thirteenth lens 35 to form a second bonded lens. In the present embodiment, the two groups of cemented lenses reduce the chromatic aberration of the picture and the sensitivity of the picture, so as to improve the picture quality.
In one embodiment, referring to fig. 1, the curved mirror is a concave mirror.
In particular, the curved mirror may be a convex mirror or a concave mirror. In this embodiment, it is considered that the convex mirror is large in size and has an exposed outside to dust. In this embodiment, the curved mirror is a concave mirror.
In this embodiment, the convex mirror diverges the light and the concave mirror converges the light. The smaller the focal length of the concave reflector, the stronger the converging capability of the concave reflector to light rays, and the higher the picture imaging quality.
In one embodiment, referring to fig. 1, the second lens 21 and the third lens 22 are bonded together to form a third bonded lens.
In this embodiment, the second lens 21 is a spherical lens, the third lens 22 is a spherical lens, and the second lens 21 and the third lens 22 are connected together to form a third cemented lens, so as to reduce the focal length of the projection optical system, improve the magnification of the projection optical system, correct paraxial spherical aberration, correct chromatic aberration, and improve the quality of the image.
According to a second aspect of an embodiment of the present application, there is provided an electronic device. The projection optical system of the first aspect of the electronic device. In this embodiment, the electronic device is a projection apparatus. For example, the projection device may be a projector, or an illumination light engine, etc.
In a specific embodiment, referring to fig. 1, the projection optical system includes a curved mirror 1, a fourth lens 20, a second lens 21, a third lens 22, a ninth lens 38, a tenth lens 39, a fifth lens 30, a sixth lens 31, an eleventh lens 40, a seventh lens 32, a twelfth lens 34, a thirteenth lens 35, a fourteenth lens 36, a fifteenth lens 37, and an eighth lens 33, and a diaphragm 4 is disposed between the eleventh lens 40 and the seventh lens 32; the focal power arrangement sequence of the projection optical system is as follows: an aspherical concave mirror (+) is an object side surface of a negative positive, e.g., a curved mirror is S1, an image side surface (a surface close to an enlargement side) of the fourth lens element 20 is S2, an object side surface (a surface far from the enlargement side) is S3, an image side surface of the second lens element 21 is S4, an object side surface is S5.
Other specific parameters of each lens and diaphragm 4 are shown in table 1 below:
Table 1:
In the present embodiment, the curved mirror 1 (surface S1) is an aspherical lens, the fifth lens 30 (surface S11 and S12) is an aspherical lens, the sixth lens 31 (surface S13 and S14) is an aspherical lens, the seventh lens 32 (surface S18 and S19) is an aspherical lens, the eighth lens 33 (surface S27 and S28) is an aspherical lens, and the remaining lenses are spherical lenses. Wherein the spherical parameters corresponding to the aspherical lenses are shown in table 2:
Table 2:
In the present embodiment, the first lens group 2 includes a fixed lens group, which is the fourth lens 20 (object side is S3), and a moving lens group, which includes the second lens 21 and the third lens 22 (object side is S6). The projection optical system in this embodiment achieves focusing by moving the lens group, wherein the focusing size is 80"-120".
Referring to fig. 1, the moving lens group moves back and forth between the fixed lens group and the second lens group 3, corresponding to different size focusing parameters. Wherein the spacing between the fixed lens group and the second lens group 3 is fixed. Wherein the different size focusing parameters are shown in table 3:
table 3:
Where 6.24 denotes that the distance between the surface S3 and the image side surface S4 of the fourth lens 20 is 6.24mm at a focusing size of 100 ". 9.46 indicates that the distance between the surface S6 and the image side surface S7 of the ninth lens 9 is 9.46mm at a focusing size of 100 ".
The effective focal length of the projection optical system is 2.033, the projection ratio is 0.21, and the field angle is 155.6 degrees. The field parameters of the optical imaging module obtained by measurement are shown in fig. 2a to 6.
Fig. 2a to 2e are beam fans of the projection optical system. Please refer to fig. 2a to 2e. Fig. 2a to 2e show beam fan patterns (TRANSVERSE RAY FAN plot) of the projection optical system at different image heights, wherein the maximum scale and the minimum scale of the EX, EY, PX and PY axes are +50 micrometers (μm) and-50 micrometers (along the horizontal axis, one grid represents 10 micrometers), respectively. The patterns shown in fig. 2a to 2e are all within the standard range, so that it can be verified that the projection optical system of the present embodiment can achieve good optical imaging quality.
The modulation transfer function diagram (modulation transfer function, MTF) of this embodiment is shown in fig. 3). Fig. 3 is a graph of modulation transfer functions of the projection optical system at different image heights. Wherein the transverse axis is spatial frequency (Spatial Frequency IN CYCLES PER MM) and the longitudinal axis is OTF modulus (Modulus of the OTF). The values denoted by the "TS" side represent image heights. It is clear from the figure that the OTF mode value of an image can be kept at 0.7 or more throughout the interval of 0mm to 93mm in spatial frequency, and generally the quality of an image is higher as the OTF mode value is closer to 1, but since there is no case where the OTF mode value is 1 due to the influence of various factors, it is generally known that the image has high imaging quality when the OTF mode value can be kept at 0.7 or more, that is, the definition of the image is excellent, and therefore the ultra-short-focal projection optical system of the present embodiment has higher imaging quality.
Fig. 4 shows a field curvature (Field Curvature) of the present embodiment. As can be seen from the graph, the field curvature value of the projection optical system is smaller than 0.05, and the projection optical system of this embodiment can correct the field curvature.
As shown in fig. 5, the Distortion (Distortion) value of the projection optical system is less than 0.5% (usually less than 1%) as shown in the graph, and the Distortion imaged by the system under each view field is smaller, so that the requirement of human eyes on Distortion can be completely met.
Fig. 6 is a graph showing the Lateral Color (Color) of the projection optical system of the present embodiment at the image side, and the numerical values thereof are shown in table 6. The difference in lateral color is smaller than one pixel, so that the problem of color error in projecting color light is avoided, which means that the projection optical system of the present embodiment also effectively corrects the color difference.
As can be seen from the above examples, the optical imaging module provided by the application can achieve distortion less than 1%; the full field MTF is greater than 50% @93lp/mm; the image space telecentric CRA angle is less than 1 deg., and the total system length is only 8.5mm. Therefore, the optical imaging module provided by the application can further improve the imaging quality on the premise of ensuring the optical performance.
The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.
While certain specific embodiments of the present application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.
Claims (5)
1. A projection optical system, comprising, in order from an enlargement side to a reduction side: a curved reflector (1), a first lens group (2) and a second lens group (3);
The focal power of the first lens group (2) is negative, and the focal power of the second lens group (3) is positive;
the first lens group (2) comprises a moving lens group which can move along an optical axis;
The moving lens group comprises a second lens (21) and a third lens (22), and the optical powers of the second lens (21) and the third lens (22) are opposite;
The first lens group further comprises a fixed lens group, and the fixed lens group is positioned between the curved reflector (1) and the movable lens group; the fixed lens group comprises at least one fourth lens (20) with negative optical power;
The optical elements of the first lens group (2) having optical power are only the fourth lens (20), the second lens (21) and the third lens (22);
The second lens group (3) includes, in order from an enlargement side to a reduction side: a ninth lens (38), a tenth lens (39), a fifth lens (30), a sixth lens (31), an eleventh lens (40), a seventh lens (32), a twelfth lens (34), a thirteenth lens (35), a fourteenth lens (36), a fifteenth lens (37), and an eighth lens (33), wherein a diaphragm (4) is arranged between the eleventh lens (40) and the seventh lens (32);
the focal power sequence of the second lens group (3) is as follows: positive negative positive/negative positive;
The fifth lens (30) and the sixth lens (31) are both aspheric lenses, and the optical powers of the fifth lens (30) and the sixth lens (31) are opposite;
The eighth lens (33) is an aspherical lens, and the seventh lens (32) is an aspherical lens;
The twelfth lens (34) is connected with the thirteenth lens (35) in a gluing way to form a first gluing lens;
the fourteenth lens (36) and the fifteenth lens (37) are connected in a gluing way to form a second gluing lens;
The optical elements of the second lens group (3) having optical power are only the ninth lens (38), the tenth lens (39), the fifth lens (30), the sixth lens (31), the eleventh lens (40), the seventh lens (32), the twelfth lens (34), the thirteenth lens (35), the fourteenth lens (36), the fifteenth lens (37), and the eighth lens (33).
2. The projection optical system according to claim 1, characterized in that the refractive index Nd of the fifth lens (30) is < 1.7 ;
The refractive index Nd of the sixth lens (31) is less than 1.7.
3. Projection optical system according to claim 1, characterized in that the curved mirror (1) is a concave mirror.
4. Projection optical system according to claim 1, characterized in that the second lens (21) and the third lens (22) are cemented together to form a third cemented lens.
5. An electronic device comprising the projection optical system of any one of claims 1-4.
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