CN111624836A - Standard micro-projection lens - Google Patents
Standard micro-projection lens Download PDFInfo
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- CN111624836A CN111624836A CN202010699606.4A CN202010699606A CN111624836A CN 111624836 A CN111624836 A CN 111624836A CN 202010699606 A CN202010699606 A CN 202010699606A CN 111624836 A CN111624836 A CN 111624836A
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- Prior art keywords
- lens
- projection
- standard micro
- projection lens
- biconvex
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- 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
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention provides a standard micro-projection lens, which belongs to the technical field of optical lenses, and is characterized in that a negative meniscus lens I, an aspheric lens, a negative meniscus lens II, a biconvex lens I, an achromatic lens group II, an achromatic lens group III and a dioptric lens group are sequentially arranged from left to right along the light direction; the first achromatic lens group comprises a biconvex lens II and a biconcave lens I, the second achromatic lens group comprises a meniscus lens and a biconvex lens III, and the third achromatic lens group comprises a biconcave lens II and a biconvex lens IV. The invention can reduce the volume of the lens and improve the performance of the lens product, under a 40-inch to 120-inch projection picture, the central resolution is 100lp/mm, the peripheral resolution is 93lp/mm, the resolution is good, the resolution is high, the imaging quality is good, and the TI 0.33 chip can be used.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a standard micro-projection lens.
Background
With the development of projection technology, a miniature projector using an LED as a light source has a strong trend in the market. At present, DLP array is all adopted the 0.33 inch DMD chip of TI, and as miniature projector owner beats the chip, diminishes along with the chip volume, and miniature projector's whole volume also requires to be done littleer. This requires that the lens also be smaller and of better quality.
The patent document with the publication number of CN109633868A discloses a middle-focus high-definition micro-projection lens, which belongs to the technical field of optical lenses, and the middle-focus high-definition micro-projection lens is sequentially provided with an aspheric lens, a negative meniscus lens, a biconcave negative lens, a focusing group, an achromatic lens group and a dioptric lens group from left to right along the light direction, wherein the focusing group comprises a biconvex positive lens and a biconcave negative lens group, the achromatic lens group comprises a biconcave lens group and a biconvex lens group, and the dioptric lens group comprises a first biconvex lens and a second biconvex lens. The medium-focus high-definition micro-projection lens is low in cost, the structure process adopts a fixed design form, the product assembly efficiency and the performance stability can be guaranteed, the resolution ratio is high, the manufacturability is good, and the large-scale production can be realized.
Patent document No. CN110998447A discloses a refractive projection lens (PO) that reproduces a pattern arranged in an object plane (OS) of the projection lens into an image plane (IS) of the projection lens using electromagnetic radiation of a mercury vapor Lamp (LS), the refractive projection lens having: a plurality of lens elements mounted between the object plane (OS) and the image plane (IS) along the optical Axis (AX) and designed such that a Pattern (PAT) mounted in the object plane can be reproduced into the image plane at a reduced imaging scale using a lens. The lens barrel includes a first lens composed of a first material having a relatively low Abbe number and a second lens composed of a second material having a higher Abbe number than the first material. The projection lens includes only the following lens groups: a first lens group (LG1) having positive optical power behind an object plane (OS); a second lens group (LG2) having a negative optical power behind the first lens group (LG1) for generating a size of about a regional minimum fringe beam height between the object plane and the image plane; a third lens group (LG3) having a positive optical power after the second lens group (LG2) between the second lens group and an aperture position (BP) suitable for mounting an Aperture Stop (AS); and a fourth lens group (LG4) having positive optical power between the aperture position (BP) and the image plane. Combining the first lens and the second lens such that imaging aberrations are corrected simultaneously for the wavelength ranges of at least two emission lines of a mercury-vapor lamp.
The two lenses have large volumes and cannot meet the use requirement of a 0.33-inch DMD chip.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a standard micro-projection lens, which can reduce the size of the lens and improve the performance of the lens.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a negative meniscus lens I, an aspheric lens, a negative meniscus lens II, a biconvex lens I, an achromatic lens group II, an achromatic lens group III and a dioptric lens group are sequentially arranged from left to right along the light direction.
Furthermore, one achromatic lens group comprises a biconvex lens II and a biconcave lens I, the other achromatic lens group comprises a meniscus lens and a biconvex lens III, and the third achromatic lens group comprises a biconcave lens II and a biconvex lens IV.
Further, the dioptric lens group comprises two biconvex lenses V.
Furthermore, the effective focal length of the standard micro projection lens is less than or equal to 9.09mm, and the aperture value of the lens is F1.64.
Furthermore, the effective back focus of the standard micro projection lens is less than or equal to 25.3mm, and the optical total length is less than or equal to 62.8 mm.
Further, the standard micro-projection lens can realize the image resolution under a projection picture of 40 inches to 120 inches, wherein the central resolution is 100lp/mm, and the peripheral resolution is 93 lp/mm.
Further, the projection ratio of the standard micro-projection lens is 1.2.
Furthermore, the aspheric lens is made of plastic, and other lenses are made of glass.
Furthermore, the standard micro-projection lens is fixed by a rear frame, the rear frame is fixed by a slide bar, a cam cylinder and a flange cylinder, and the whole group of focusing is performed by a cam.
With the development of image technology, projection lenses are widely used in projection optical systems for various purposes. Conventionally, projection display devices using light valves such as liquid crystal display elements and DMD display elements have been widely used. A wide-angle lens used for such a projection type display device is required to have good aberration correction commensurate with the resolution of the light valve. In addition, in view of the improvement of the degree of freedom in setting the distance to the screen, high optical performance is required in which each aberration is corrected well while a wide angle is achieved. Further, in order to dispose an optical system such as a prism between the light valve and the wide-angle lens, a back focal length having an appropriate length is required. Accordingly, those skilled in the art are eagerly studying the focal length and the light angle of the lens.
In response to such a demand, the following relay type wide-angle system is proposed: an intermediate image is formed at a position conjugate to the reduction-side imaging surface and is re-imaged on the enlargement-side imaging surface. However, since aberration is corrected in the lens portion on the enlargement side and the lens portion on the reduction side with an intermediate image interposed therebetween, there is a problem that the number of lenses is increased, and for example, in the case of a wide angle of 130 ° or more, there is a problem that the lens diameter on the enlargement side is increased. As a result, when a plurality of types of wide-angle lenses are provided to correspond to engines of different specifications, there is a problem that the cost increases and the burden on the user increases. For example, patent document No. CN110208929A discloses a wide-angle lens that has a wide angle while suppressing the lens diameter on the enlargement side, and that is low in cost, a projection lens used for the wide-angle lens, a relay lens used for the wide-angle lens, a projection display device provided with the wide-angle lens, and a relay lens unit used for the projection display device.
Along with the social development, a high-brightness laser engineering projector using laser as a light source appears, and meanwhile, the development of the film industry also prompts the film engineering projector which requires high brightness, short-distance projection, large size and high definition. At present, projectors in the market cannot meet the development requirements of high brightness, short-distance projection, large size and high definition at the same time. In particular, for a projection lens, in order to ensure stable assembly efficiency and product performance, the design requirements and the part machining requirements are improved to ensure the product performance and the assembly efficiency of the lens. These measures usually increase the product cost, and the large-scale production is very important for higher cost requirements, cost reduction and guarantee of assembly efficiency and product performance stability. Patent document CN207380323U discloses a short-focus high-definition projection lens, and relates to a projection lens. This camera lens has from left to right set gradually negative meniscus lens, aspherical lens, biconcave surface negative lens group, focus group, biconvex lens system field lens, aberration-eliminating lens group, dioptric lens group along the light direction, biconcave surface negative lens group comprises 2 biconcave negative lenses, focus group comprises 2 biconcave negative lenses and 1 biconvex positive lens, dioptric lens group comprises 2 biconcave lenses and 1 biconvex lens, achromatic lens group comprises 2 biconcave lenses and 2 biconvex lenses, dioptric lens group comprises 1 biconvex lens and 1 biconvex lens.
With the social development, a screen-less television using a DLP projection technology and an LED as a light source appears, at present, a DLP micro projector in the market uses a DMD chip with a thickness of 0.33 inch TI as a screen-less television, requirements for definition, fineness and the like of a product need to be improved, and unfortunately, the visual perception of the current product for people cannot achieve the visual effect of the television. Due to the reduction of the size of the micromirror, the requirement on the projection lens is further improved, and particularly for the projection lens, in order to ensure the assembly efficiency and the performance stability of the product, the product performance and the assembly efficiency of the lens are ensured by improving the design requirement and the processing requirement of tight parts in the traditional method. These measures usually increase the product cost, and the large-scale production is very important for higher cost requirements, cost reduction and guarantee of assembly efficiency and product performance stability.
The invention has the beneficial effects that:
1. the invention provides a standard micro-projection lens, which is continuously optimized, and finally adopts an aspheric surface and a spherical surface, thereby reducing the processing difficulty of the lens, reducing the cost and reducing the volume (the optical total length is less than or equal to 62.8mm, and the optical maximum outer diameter is less than or equal to 24.5 mm).
2. The invention provides a standard micro-projection lens, which adopts a single cylinder to fix all lenses, reduces assembly errors and saves cost; the anti-reflection stripes are added at the proper positions of the single tube, so that the internal reflection of stray light in the lens is reduced, and the contrast of the micro-projection projector is greatly improved.
3. The invention provides a standard micro-projection lens, which is characterized in that a rear barrel is fixed through a slide bar, a cam barrel and a flange barrel, and the rear barrel is driven by the cam barrel to carry out whole-group focusing.
4. The invention provides a standard micro-projection lens, which has the advantages of good resolution, high resolution and good imaging quality, and meets the use requirement of a TI 0.33 chip, wherein the central resolution is 100lp/mm, the peripheral resolution is 93lp/mm, and the resolution is good under a projection picture of 40-120 inches.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a diagram of an optical system of the present invention;
FIG. 2 is a schematic diagram of the mechanism (including optics) of the present invention;
FIG. 3 is a graph of MTF and SPOT according to the present invention (frame 80 inches).
FIG. 4 is a peripheral light ratio map of the present invention.
FIG. 5 is a graph of MTF (different temperatures) for the present invention.
FIG. 6 is a graph of the magnification chromatic aberration of the present invention.
The meaning of the respective reference numerals is as follows:
1: negative meniscus lenses i, 2: aspherical lens, 3: negative meniscus lenses ii, 4: lenticular lens i, 5: lenticular lenses ii, 6: biconcave lenses i, 7: meniscus lens, 8: lenticular lens iii, 9: biconcave lenses ii, 10: lenticular lenses iv, 11: lenticular lens v, 12: rear frame, 13: cam cylinder, 14: flange cylinder, 15: and (4) sliding the rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 6 of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Example 1
As shown in fig. 1-6, a standard micro-projection lens is sequentially provided with a negative meniscus lens i 1, an aspheric lens 2, a negative meniscus lens ii 3, a biconvex lens i 4, an achromatic lens group i, an achromatic lens group ii, an achromatic lens group iii and a dioptric lens group from left to right along a light direction.
The first achromatic lens group comprises a biconvex lens II 5 and a biconcave lens I6, the second achromatic lens group comprises a meniscus lens 7 and a biconvex lens III 8, and the third achromatic lens group comprises a biconcave lens II 9 and a biconvex lens IV 10.
The dioptric lens group comprises two biconvex lenses V11.
The effective focal length of the standard micro projection lens is less than or equal to 9.09mm, and the aperture value of the lens is F1.64.
The effective back focus of the standard micro projection lens is less than or equal to 25.3mm, and the optical total length is less than or equal to 62.8 mm.
The standard micro-projection lens has the image resolution of 100lp/mm in the central resolution and 93lp/mm in the peripheral resolution under a projection picture of 40 inches to 120 inches.
The projection ratio of the standard micro projection lens is 1.2.
The aspheric lens is made of plastic, and other lenses are made of glass. All lenses are fixed by adopting the single cylinder, so that the assembly error is reduced, and the cost is saved.
The effective focal length of the standard micro-projection lens is 9.09mm, the aperture value of the lens is F1.64, and the throw ratio is 1.2. The standard micro-projection lens has the advantages of compact structure, good analysis, high resolution and good imaging quality, and can meet the use requirement of TI 0.33 chips.
Wherein: the aspheric lens is made of plastic, other lenses are made of glass, the plastic is injection molded, high precision and stability of the lens are guaranteed, cost is reduced, the glass is made of conventional specifications, the shape is simple, and processing is convenient and reliable.
The following are the detailed parameters and air space for each lens when meeting the above requirements:
table 1: structural parameters of each lens
Example 2
As shown in fig. 2, embodiment 2 differs from embodiment 1 in that: a fixing mode of a standard micro-projection lens is characterized in that all lenses of the standard micro-projection lens are fixed through a rear frame 12, the rear frame 12 is fixed through a slide bar 15, a cam cylinder 13 and a flange cylinder 14, and the whole set of focusing is carried out through a cam.
The lens adopts a single cylinder to fix all lenses, so that assembly errors are reduced, and the cost is saved; the anti-reflection stripes are added at the proper positions of the single tube, so that the internal reflection of stray light in the lens is reduced, and the contrast of the micro-projection projector is greatly improved. The standard micro-projection lens fixes the rear barrel through the slide bar, the cam barrel and the flange barrel, and the rear barrel is driven by the cam barrel to carry out whole-group focusing, so that the assembly difficulty and sensitivity are reduced, and the assembly efficiency of products is improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A standard micro-projection lens is characterized in that: the negative meniscus lens I, the aspheric lens, the negative meniscus lens II, the biconvex lens I, the achromatic lens group II, the achromatic lens group III and the dioptric lens group are sequentially arranged from left to right along the light ray direction.
2. A standard micro-projection lens as claimed in claim 1, characterized in that: the first achromatic lens group comprises a biconvex lens II and a biconcave lens I, the second achromatic lens group comprises a meniscus lens and a biconvex lens III, and the third achromatic lens group comprises a biconcave lens II and a biconvex lens IV.
3. A standard micro-projection lens as claimed in claim 1, characterized in that: the dioptric lens group comprises two biconvex lenses V.
4. A standard micro-projection lens as claimed in claim 1, characterized in that: the effective focal length of the standard micro projection lens is less than or equal to 9.09mm, and the aperture value of the lens is F1.64.
5. A standard micro-projection lens as claimed in claim 1, characterized in that: the effective back focus of the standard micro projection lens is less than or equal to 25.3mm, and the optical total length is less than or equal to 62.8 mm.
6. A standard micro-projection lens as claimed in claim 1, characterized in that: the standard micro-projection lens has the image resolution of 100lp/mm in the central resolution and 93lp/mm in the peripheral resolution under a projection picture of 40 inches to 120 inches.
7. A standard micro-projection lens as claimed in claim 1, characterized in that: the projection ratio of the standard micro projection lens is 1.2.
8. A standard micro-projection lens as claimed in claim 1, characterized in that: the aspheric lens is made of plastic, and other lenses are made of glass.
9. A fixing mode of a standard micro projection lens is characterized in that: the standard micro-projection lens fixes all lenses through a rear frame, the rear frame is fixed through a slide bar, a cam cylinder and a flange cylinder, and the whole group of focusing is performed through a cam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010699606.4A CN111624836A (en) | 2020-07-20 | 2020-07-20 | Standard micro-projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010699606.4A CN111624836A (en) | 2020-07-20 | 2020-07-20 | Standard micro-projection lens |
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| CN111624836A true CN111624836A (en) | 2020-09-04 |
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| CN202010699606.4A Pending CN111624836A (en) | 2020-07-20 | 2020-07-20 | Standard micro-projection lens |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056901A (en) * | 1989-04-03 | 1991-10-15 | Jenoptik Jena G.M.B.H. | Wide-angle objective |
| CN1119747A (en) * | 1994-05-02 | 1996-04-03 | Lg电子株式会社 | projection lens |
| WO2013071676A1 (en) * | 2011-11-15 | 2013-05-23 | 深圳市亿思达显示科技有限公司 | High-resolution wide-angle projection lens and projector |
| US20150055225A1 (en) * | 2013-08-22 | 2015-02-26 | Canon Kabushiki Kaisha | Zoom lens and image projection apparatus including the same |
| CN207198445U (en) * | 2017-09-27 | 2018-04-06 | 南阳南方智能光电有限公司 | High zoom high definition is big as circle zoom projection lens |
| KR20180119885A (en) * | 2017-04-26 | 2018-11-05 | 주식회사 삼양옵틱스 | Lens optical system and photographing apparatus having the same |
| CN109633868A (en) * | 2019-02-19 | 2019-04-16 | 南阳南方智能光电有限公司 | The micro- throwing projection lens of burnt high definition in one kind |
| CN110618524A (en) * | 2018-06-19 | 2019-12-27 | 深圳光峰科技股份有限公司 | Fixed-focus lens and imaging system |
-
2020
- 2020-07-20 CN CN202010699606.4A patent/CN111624836A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056901A (en) * | 1989-04-03 | 1991-10-15 | Jenoptik Jena G.M.B.H. | Wide-angle objective |
| CN1119747A (en) * | 1994-05-02 | 1996-04-03 | Lg电子株式会社 | projection lens |
| WO2013071676A1 (en) * | 2011-11-15 | 2013-05-23 | 深圳市亿思达显示科技有限公司 | High-resolution wide-angle projection lens and projector |
| US20150055225A1 (en) * | 2013-08-22 | 2015-02-26 | Canon Kabushiki Kaisha | Zoom lens and image projection apparatus including the same |
| KR20180119885A (en) * | 2017-04-26 | 2018-11-05 | 주식회사 삼양옵틱스 | Lens optical system and photographing apparatus having the same |
| CN207198445U (en) * | 2017-09-27 | 2018-04-06 | 南阳南方智能光电有限公司 | High zoom high definition is big as circle zoom projection lens |
| CN110618524A (en) * | 2018-06-19 | 2019-12-27 | 深圳光峰科技股份有限公司 | Fixed-focus lens and imaging system |
| CN109633868A (en) * | 2019-02-19 | 2019-04-16 | 南阳南方智能光电有限公司 | The micro- throwing projection lens of burnt high definition in one kind |
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Application publication date: 20200904 |