CN111999844A - Mini-type optical imaging system capable of adjusting optical total length - Google Patents
Mini-type optical imaging system capable of adjusting optical total length Download PDFInfo
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- CN111999844A CN111999844A CN202010901567.1A CN202010901567A CN111999844A CN 111999844 A CN111999844 A CN 111999844A CN 202010901567 A CN202010901567 A CN 202010901567A CN 111999844 A CN111999844 A CN 111999844A
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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
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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
- G02B7/006—Filter holders
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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
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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Abstract
The invention discloses a mini-type optical imaging system capable of adjusting the total optical length, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein an optical filter is fixedly arranged at one end of the sixth lens, which is far away from the fifth lens, an optical aperture diaphragm is fixedly arranged between the fourth lens 4 and the fifth lens 5, the effective aperture of the optical aperture diaphragm is phi 1.6mm, so that the optical aberration is effectively reduced, the aperture tolerance of the diaphragm is within +/-0.01 mm, the uniformity of image quality is effectively and fully ensured, the Alternal coefficient of the second lens 2 and the fifth lens 5 is more than or equal to 57 and less than or equal to 60, the second lens 2 and the fifth lens 5 are made of low-dispersion materials, the chromatic aberration of the system is effectively reduced, the total optical length of the whole ultra-short mini-type optical imaging system is effectively lower than 10mm, so that the total optical length is far less than the conventional 22mm in the market, effectively meet the requirements of ultra-small mini cameras and are suitable for popularization.
Description
Technical Field
The invention belongs to the technical field of optical imaging systems, and particularly relates to a mini-type optical imaging system capable of adjusting the total optical length.
Background
The optical system is a system formed by combining various optical elements such as a lens, a reflector, a prism, a diaphragm and the like in a certain order. The general optical imaging system is generally used for imaging or optical information processing, and is popular in conventional security optical imaging systems in the market at present, such as common triggers, fisheye optical paths, wide-angle optical paths and the like, the total optical length of the system is about 22mm, for the total optical length of 22m, the product parts are large in size and high in cost, the total optical length products of the optical systems are similar and high in replaceability, and are easy to imitate, and a rear-end camera is developed towards short, small and precise, so that the conventional total optical length system cannot be met at present. To this end, we propose a miniature optical imaging system that can adjust the total optical length.
Disclosure of Invention
The invention provides a mini-type optical imaging system capable of adjusting the total optical length, and aims to solve the existing problems.
The invention is realized in such a way that a miniature optical imaging system capable of adjusting the total optical length comprises a first lens, wherein a second lens is fixedly arranged on one side of the first lens, a third lens is fixedly arranged on one side, away from the first lens, of the second lens, a fourth lens is fixedly arranged on one side, away from the second lens, of the third lens, a fifth lens is fixedly arranged on one side, away from the third lens, of the fourth lens, a sixth lens is fixedly arranged at one end, away from the fourth lens, of the fifth lens, and an optical filter is fixedly arranged at one end, away from the fifth lens, of the sixth lens.
Further, an optical aperture diaphragm is fixedly arranged between the fourth lens and the fifth lens, and the tolerance of the aperture of the diaphragm is within +/-0.01 mm.
Furthermore, the optical filter is made of a sapphire substrate.
Further, the first lens, the second lens and the third lens are a front group movement zoom group, and the fourth lens, the fifth lens and the sixth lens are a rear group movement compensation group.
Further, the optical focal length of the front group moving zoom group is as follows: -5.6 < f anterior group < -5.4, the optical focal length of the posterior group shifted variable power group being: f is more than 5.7 and the rear group is less than 5.8.
Further, the moving amount of the front group moving zoom group is: 2.1mm < DZ1 < 2.4mm, and the moving amount of the back group moving zoom group is as follows: 1.8mm < D Z2 < 2.0 mm.
Further, the first lens: r1 is more than or equal to 16 and less than or equal to 186 and less than or equal to 70.4 and less than or equal to 0.6, D is more than or equal to 1.64 and less than or equal to 1.65, and the second lens: -10 ≦ R1 ≦ 95 ≦ R2 ≦ 5.50.5 ≦ D ≦ 0.6, 1.65 ≦ ND ≦ 1.68, the third lens: 6.6 ≦ R1 ≦ 6.8R2 ≦ 01.55 ≦ D ≦ 1.65, 1.69 ≦ ND ≦ 1.72, the fourth lens: r1 is more than or equal to 8.0 and less than or equal to 8.3 and less than or equal to 21.3 and less than or equal to D is more than or equal to 1.4, ND is more than or equal to 1.60 and less than or equal to 1.63, and the fifth lens: -11 ≦ R1 ≦ 106 ≦ R2 ≦ 6.21.8 ≦ D ≦ 2.0, 1.76 ≦ ND ≦ 1.78, the sixth lens: r1 is more than or equal to 7.6 and less than or equal to 7.8-55 and more than or equal to R2 and less than or equal to-521.2 and less than or equal to 1.3, and ND is more than or equal to 1.65 and less than or equal to 1.68; wherein: r1 and R2 represent the values of the radii of curvature of both surfaces of the lens, D represents the value of the center thickness of the lens, and ND represents the optical refractive index of the lens.
Further, the Abelian coefficient of the second lens and the fifth lens is more than or equal to 57 and less than or equal to VD and less than or equal to 60.
Further, the total optical length of the optical imaging system of the ultrashort mini type with the total optical length is lower than 10 mm.
Further, the first lens is a negative lens, the second lens is a negative lens, the third lens is a positive lens, the fourth lens is a positive lens, the fifth lens is a negative lens, and the sixth lens is a negative lens.
Compared with the prior art, the invention has the beneficial effects that:
1: the device of the invention fully compresses the optical total length, the length of the device can be reduced to be within 10mm, the optical total length is far less than the conventional 22mm in the market, the requirement of a super-small mini-type camera is effectively met, and the optical total length can be conveniently adjusted through the effective movement of the rear group movement compensation group. 2: spare part volume diminishes, and manufacturing cost can effectively reduce, 3: the second lens 2 and the fifth lens 5 are made of low-dispersion materials, so that the dispersion aberration of the system is effectively reduced, wherein the Abelian coefficient of the second lens 2 and the fifth lens 5 is more than or equal to 57 and less than or equal to 60, and VD is less than or equal to 57. 4: and the requirements of a mini-type camera are met. 5: the optical filter 7 is made of a sapphire substrate, so that light rays causing the undesirable phenomena are effectively absorbed, and the undesirable factors such as halation, ghost image and stray light of the optical system are reduced. 6: an optical aperture diaphragm is fixedly arranged between the fourth lens 4 and the fifth lens 5, and the effective aperture of the optical aperture diaphragm is phi 1.6mm, so that the optical aberration is effectively reduced, the aperture tolerance of the diaphragm is within +/-0.01 mm, and the uniformity of image quality is effectively and fully ensured.
Drawings
FIG. 1 is a schematic structural diagram of a mini-type optical imaging system capable of adjusting total optical length according to the present invention.
In the figure: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. and (3) a filter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1, a mini-type optical imaging system capable of adjusting an optical total length includes a first lens 1, a second lens 2 is fixedly disposed on one side of the first lens 1, a third lens 3 is fixedly disposed on one side of the second lens 2 away from the first lens 1, a fourth lens 4 is fixedly disposed on one side of the third lens 3 away from the second lens 2, a fifth lens 5 is fixedly disposed on one side of the fourth lens 4 away from the third lens 3, a sixth lens 6 is fixedly disposed on one end of the fifth lens 5 away from the fourth lens 4, and an optical filter 7 is fixedly disposed on one end of the sixth lens 6 away from the fifth lens 5.
In the invention, an optical aperture diaphragm is fixedly arranged between the fourth lens 4 and the fifth lens 5, and the effective aperture is phi 1.6mm, so that the optical aberration is effectively reduced, the aperture tolerance of the diaphragm is within +/-0.01 mm, and the uniformity of image quality is effectively and fully ensured.
The optical filter 7 of the present invention is made of a sapphire substrate, so as to effectively absorb the light rays causing the above-mentioned undesirable phenomena, and reduce the undesirable factors such as halo, ghost, stray light, etc. of the optical system.
According to the invention, the first lens 1, the second lens 2 and the third lens 3 are a front group moving zoom group, the fourth lens 4, the fifth lens 5 and the sixth lens 6 are a rear group moving compensation group, and the optical total length can be conveniently adjusted through the effective movement of the rear group moving compensation group.
The optical focal length of the front group moving zoom group is as follows: -5.6 < f anterior group < -5.4, the optical focal length of the posterior group shifted variable power group being: f is more than 5.7 and the rear group is less than 5.8.
The moving amount of the front group moving zoom group is as follows: 2.1mm < DZ1 < 2.4mm, and the moving amount of the back group moving zoom group is as follows: 1.8mm < D Z2 < 2.0 mm.
First lens 1 of the present invention: r1 and R2 are more than or equal to 16 and more than or equal to 186 and more than or equal to 70.4 and less than or equal to 0.6, ND is more than or equal to 1.64 and less than or equal to 1.65, and the second lens 2: -10. ltoreq. R1. ltoreq-95. ltoreq. R2. ltoreq. 5.50.5. ltoreq. D. ltoreq.0.6, 1.65. ltoreq. ND. ltoreq.1.68, the third lens 3: 6.6 ≦ R1 ≦ 6.8R2 ≦ 01.55 ≦ D ≦ 1.65, 1.69 ≦ ND ≦ 1.72, the fourth lens 4: r1 is more than or equal to 8.0 and less than or equal to 8.3 and less than or equal to 21.3 and less than or equal to D2 and less than or equal to 1.4, ND is more than or equal to 1.60 and less than or equal to 1.63, and the fifth lens 5: -11 ≦ R1 ≦ 106 ≦ R2 ≦ 6.21.8 ≦ D ≦ 2.0, 1.76 ≦ ND ≦ 1.78, the sixth lens 6: r1 is more than or equal to 7.6 and less than or equal to 7.8-55 and more than or equal to R2 and less than or equal to-521.2 and less than or equal to 1.3, and ND is more than or equal to 1.65 and less than or equal to 1.68; wherein: r1 and R2 are curvature radius values of two surfaces of the lens, D is a central thickness value of the lens, ND is an optical refractive index of the lens, and high-refraction materials are effectively adopted to ensure the optical refractive index.
The optical focal length of the front group moving zoom group is as follows: the second lens 2 and the fifth lens 5 have an einner coefficient VD of 57-60, and the second lens 2 and the fifth lens 5 are made of low dispersion materials, so that chromatic aberration of the system is effectively reduced.
The optical focal length of the front group moving zoom group is as follows: the total optical length of the optical imaging system of the ultra-short mini type with the total optical length is lower than 10mm, so that the total optical length is far shorter than the conventional 22mm in the market, and the requirement of an ultra-small mini type camera is effectively met.
In the present invention, the first lens 1 is a negative lens, the second lens 2 is a negative lens, the third lens 3 is a positive lens, the fourth lens 4 is a positive lens, the fifth lens 5 is a negative lens, and the sixth lens 6 is a negative lens.
The working principle of the invention is as follows: first lens 1 one side is fixed and is provided with second lens 2, second lens 2 is the negative lens, second lens 2 keeps away from the fixed third lens 3 that is provided with in one side of first lens 1, second lens 2 and third lens 3 are preceding group's removal zoom group, and the optical focal length that preceding group removed zoom group is: front group < -5.4 > f < 5.6. The fixed fourth lens 4 that is provided with in one side that keeps away from second lens 2 of third lens 3, the fixed fifth lens 5 that is provided with in one side that third lens 3 was kept away from to fourth lens 4, and the fixed optical aperture diaphragm that is equipped with between fourth lens 4 and the fifth lens 5, its effective bore is phi 1.6mm to effectively reduce optical aberration the diaphragm aperture tolerance is within 0.01mm, effectively fully guarantees image quality homogeneity. The fifth lens 5 is far away from the fixed sixth lens 6 that is provided with of one end of fourth lens 4, fifth lens 5 and sixth lens 6 are the back group and move the compensation group, and the optical focal length that the back group moved the zoom group is: f is more than 5.7 and the rear group is less than 5.8. The fixed light filter 7 that is provided with of one end that keeps away from fifth lens 5 of sixth lens 6, light filter 7 adopts sapphire base material, and the effective absorption arouses the light of above-mentioned bad phenomenon, reduces adverse factors such as optical system's halo, ghost and stray light, and simultaneously, the einer coefficient of second lens 2 and fifth lens 5 is 57 be less than or equal to VD 60, second lens 2 and fifth lens 5 adopt low dispersion material, the effectual chromatic aberration that reduces the system. Thereby achieving that the whole optical total length of the optical imaging system of the optical total length super-small type is less than 10mm, further realizing that the optical total length is far less than the conventional 22mm in the market, and effectively meeting the requirement of a super-small mini-type camera
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An adjustable optical overall length mini-type optical imaging system, comprising a first lens (1), characterized in that: first lens (1) one side is fixed and is provided with second lens (2), one side that first lens (1) was kept away from in second lens (2) is fixed and is provided with third lens (3), one side that second lens (2) were kept away from in third lens (3) is fixed and is provided with fourth lens (4), one side that third lens (3) were kept away from in fourth lens (4) is fixed and is provided with fifth lens (5), the one end that fourth lens (4) were kept away from in fifth lens (5) is fixed and is provided with sixth lens (6), the one end that fifth lens (5) were kept away from in sixth lens (6) is fixed and is provided with light filter (7).
2. The system of claim 1, wherein: an optical aperture diaphragm is fixedly arranged between the fourth lens (4) and the fifth lens (5), and the tolerance of the aperture of the diaphragm is within +/-0.01 mm.
3. The system of claim 1, wherein: the optical filter (7) is made of a sapphire substrate.
4. The system of claim 1, wherein: the first lens (1), the second lens (2) and the third lens (3) are a front group moving zoom group, and the fourth lens (4), the fifth lens (5) and the sixth lens (6) are a rear group moving compensation group.
5. The system of claim 4, wherein: the optical focal length of the front group moving zoom group is as follows: -5.6 < f anterior group < -5.4, the optical focal length of the posterior group shifted variable power group being: f is more than 5.7 and the rear group is less than 5.8.
6. The system of claim 1, wherein: the moving amount of the front group moving zoom group is as follows: 2.1mm < DZ1 < 2.4mm, and the moving amount of the back group moving zoom group is as follows: 1.8mm < D Z2 < 2.0 mm.
7. The system of claim 1, wherein: the first lens (1): 16-186R 2-70.4-0.6D, 1.64-1.65 ND, and the second lens (2): -10 ≦ R1 ≦ 95 ≦ R2 ≦ 5.50.5 ≦ D ≦ 0.6, 1.65 ≦ ND ≦ 1.68, the third lens (3): 6.6 ≦ R1 ≦ 6.8R2 ≦ 01.55 ≦ D ≦ 1.65, 1.69 ≦ ND ≦ 1.72, the fourth lens (4): r1 is more than or equal to 8.0 and less than or equal to 8.3 and less than or equal to 21 and less than or equal to-2 and less than or equal to-201.3, D is less than or equal to 1.4, ND is more than or equal to 1.60 and less than or equal to 1.63, and the fifth lens (5): -11 ≦ R1 ≦ 106 ≦ R2 ≦ 6.21.8 ≦ D ≦ 2.0, 1.76 ≦ ND ≦ 1.78, the sixth lens (6): r1 is more than or equal to 7.6 and less than or equal to 7.8-55 and more than or equal to R2 and less than or equal to-521.2 and less than or equal to 1.3, and ND is more than or equal to 1.65 and less than or equal to 1.68; wherein: r1 and R2 represent the values of the radii of curvature of both surfaces of the lens, D represents the value of the center thickness of the lens, and ND represents the optical refractive index of the lens.
8. The system of claim 1, wherein: the second lens (2) and the fifth lens (5) have an Abelian coefficient VD of 57-60.
9. The system of claim 1, wherein: the total optical length of the optical imaging system of the ultrashort mini type with the total optical length is lower than 10 mm.
10. The system of claim 1, wherein: the lens comprises a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5) and a sixth lens (6), wherein the first lens (1) is a negative lens, the second lens (2) is a negative lens, the third lens is a positive lens, the fourth lens is a positive lens, the fifth lens is a negative lens, and the sixth lens is a negative lens.
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| CN202010901567.1A CN111999844B (en) | 2020-08-31 | 2020-08-31 | Mini-type optical imaging system capable of adjusting optical total length |
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| CN202010901567.1A CN111999844B (en) | 2020-08-31 | 2020-08-31 | Mini-type optical imaging system capable of adjusting optical total length |
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| CN111999844B CN111999844B (en) | 2022-09-23 |
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| JPH11119102A (en) * | 1997-10-14 | 1999-04-30 | Olympus Optical Co Ltd | Zoom optical system |
| CN1693935A (en) * | 2004-05-06 | 2005-11-09 | 日本电产科宝株式会社 | Zoom lens |
| CN107577031A (en) * | 2016-07-05 | 2018-01-12 | 大立光电股份有限公司 | Optical imaging lens assembly, image capturing device and electronic device |
| CN108227154A (en) * | 2018-03-26 | 2018-06-29 | 中国计量大学 | A kind of mobile phone wide-angle zoom lens |
| CN108519661A (en) * | 2017-12-22 | 2018-09-11 | 苏州莱能士光电科技股份有限公司 | A kind of mini varifocal optical system that optics overall length is ultrashort |
| CN208902954U (en) * | 2018-09-26 | 2019-05-24 | 苏州莱能士光电科技股份有限公司 | A kind of big wide angle micro optical imaging system |
| JP2019179180A (en) * | 2018-03-30 | 2019-10-17 | 京セラ株式会社 | Imaging lens unit |
| CN110646920A (en) * | 2019-09-17 | 2020-01-03 | 福建福光天瞳光学有限公司 | Long-focus vehicle-mounted optical lens and working method thereof |
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2020
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479295A (en) * | 1993-09-02 | 1995-12-26 | Nikon Corporation | Compact zoom lens |
| JPH11119102A (en) * | 1997-10-14 | 1999-04-30 | Olympus Optical Co Ltd | Zoom optical system |
| CN1693935A (en) * | 2004-05-06 | 2005-11-09 | 日本电产科宝株式会社 | Zoom lens |
| CN107577031A (en) * | 2016-07-05 | 2018-01-12 | 大立光电股份有限公司 | Optical imaging lens assembly, image capturing device and electronic device |
| CN108519661A (en) * | 2017-12-22 | 2018-09-11 | 苏州莱能士光电科技股份有限公司 | A kind of mini varifocal optical system that optics overall length is ultrashort |
| CN108227154A (en) * | 2018-03-26 | 2018-06-29 | 中国计量大学 | A kind of mobile phone wide-angle zoom lens |
| JP2019179180A (en) * | 2018-03-30 | 2019-10-17 | 京セラ株式会社 | Imaging lens unit |
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Denomination of invention: A mini optical imaging system with adjustable total optical length Effective date of registration: 20230918 Granted publication date: 20220923 Pledgee: Agricultural Bank of China Co.,Ltd. Taixing Sub branch Pledgor: Taixing Huilong Photoelectric Instrument Co.,Ltd. Registration number: Y2023980056995 |
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