CN110806633A - 1.4mm wide-angle optical system and imaging method thereof - Google Patents
1.4mm wide-angle optical system and imaging method thereof Download PDFInfo
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- CN110806633A CN110806633A CN201911170245.8A CN201911170245A CN110806633A CN 110806633 A CN110806633 A CN 110806633A CN 201911170245 A CN201911170245 A CN 201911170245A CN 110806633 A CN110806633 A CN 110806633A
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention relates to a 1.4mm wide-angle optical system, which comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a fifth lens which are sequentially arranged at intervals from left to right along a light incident light path; the first lens is a negative meniscus lens, the second lens is a positive meniscus lens, the first lens and the second lens form a front group lens with negative focal power, the concave surface of the first lens faces the diaphragm, and the concave surface of the second lens faces away from the diaphragm; the third lens is a double convex positive lens, the fourth lens is a double concave negative lens, and the fifth lens is a double convex positive lens, and the third lens, the fourth lens and the fifth lens form a rear group lens with positive focal power. The design of the invention has the characteristics of large field angle and large light transmission quantity; by adopting the design scheme of a plurality of aspheric lenses, the overall reliability is high, the assembly sensitivity of the lens group is low, the yield is high, the cost is low, and the large-scale production is facilitated; the imaging quality is high, and the high-definition camera shooting level of two million pixels is achieved.
Description
Technical Field
The invention relates to a 1.4mm wide-angle optical system and an imaging method thereof.
Background
The vehicle-mounted rearview mirror head is widely applied to a vehicle-mounted monitoring system and provides functions of automobile rearview image, backing assistance and the like for a driver. With the development of the automobile industry, higher requirements are put forward on the performance of the vehicle-mounted rearview lens. The common rearview mirror head generally adopts a 5-6 full glass lens structure, has larger size and heavier weight, can not meet the requirement of miniaturization and has higher manufacturing cost; besides, the aperture of the common rearview mirror is small, so that the edge light flux at the corner of a large view field is insufficient, the edge imaging is not clear enough, and the overall imaging quality is influenced.
In view of the defects of the prior art, the invention aims to provide a 1.4mm wide-angle optical system, which achieves the purposes of realizing two million high-definition image quality, miniaturization and cost reduction by adopting more aspheric lenses.
Disclosure of Invention
Aiming at the defects, the invention provides a 1.4mm wide-angle optical system with a simple structure and an imaging method thereof.
The technical scheme of the invention is that the 1.4mm wide-angle optical system comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a fifth lens which are sequentially arranged at intervals from left to right along a light incident light path;
the first lens is a negative meniscus lens, the second lens is a positive meniscus lens, the first lens and the second lens form a front group lens with negative focal power, the concave surface of the first lens faces the diaphragm, and the concave surface of the second lens faces away from the diaphragm;
the third lens is a double convex positive lens, the fourth lens is a double concave negative lens, and the fifth lens is a double convex positive lens, and the third lens, the fourth lens and the fifth lens form a rear group lens with positive focal power.
Further, the air space between the first lens and the second lens is 1.65-1.70 mm, the air space between the third lens and the fourth lens is 0.25-0.30 mm, the air space between the fourth lens and the fifth lens is 0.10-0.15 mm, and the air space between the front group lens and the rear group lens is 1.0-1.2 mm.
Furthermore, the focal length of an optical system formed by the front group lens and the rear group lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are respectively f1、f2、f3、f4、f5Wherein f is1、f2、f3、f4、f5And f satisfy the following ratio:
-2.5＜f1/f＜-2，5.5＜f2/f＜6，1.5＜f3/f＜1.8，-1.5＜f4/f＜-0.5，1＜f5/f＜2
further, the first lens satisfies the relation: n is a radical ofd≥1.7，VdLess than or equal to 50; the second lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 30; the third lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 55; the fourth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 30; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 55, wherein NdIs refractive index, VdAbbe constant.
Furthermore, the first lens is a spherical lens and is made of a glass material; the second lens, the third lens, the fourth lens and the fifth lens are aspheric lenses and are all made of plastic materials.
An imaging method of a 1.4mm wide-angle optical system comprises the following steps: the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens and the fifth lens from left to right to form an image.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the all-glass design, the design structure of 1G4P is simpler, and has smaller size and mass; the system has high overall reliability and reduced assembly sensitivity, so that the yield is improved, the cost is reduced, and the large-scale production is facilitated.
2. Meanwhile, the large field angle and the large light transmission caliber are ensured, the light inlet quantity is sufficient, and the edge imaging quality is good; through reasonable glass material collocation and lens optical power distribution, the axial chromatic aberration and the transverse chromatic aberration of the whole optical system are well corrected, the high-grade chromatic aberration of the whole optical system is effectively corrected due to reasonable surface design, meanwhile, the light incident angle of each mirror surface is small, and the overall imaging quality of the system is excellent.
Drawings
The invention is further described with reference to the following figures.
FIG. 1 is a schematic diagram of an optical configuration of an embodiment of the present invention;
FIG. 2 is a graph of the visible light MTF for an embodiment of the present invention;
FIG. 3 is a graph of axial chromatic aberration for an embodiment of the present invention;
fig. 4 is a lateral chromatic aberration plot of an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1 to 4, a 1.4mm wide-angle optical system includes a first lens a1, a second lens a2, a diaphragm C, a third lens B1, a fourth lens B2 and a fifth lens B3, which are sequentially arranged along a light incident path from left to right at intervals;
the first lens is a negative meniscus lens, the second lens is a positive meniscus lens, the first lens and the second lens form a front group lens with negative focal power, the concave surface of the first lens faces the diaphragm, and the concave surface of the second lens faces away from the diaphragm;
the third lens is a double convex positive lens, the fourth lens is a double concave negative lens, and the fifth lens is a double convex positive lens, and the third lens, the fourth lens and the fifth lens form a rear group lens with positive focal power.
In the embodiment, the air space between the first lens and the second lens is 1.65-1.70 mm, the air space between the third lens and the fourth lens is 0.25-0.30 mm, the air space between the fourth lens and the fifth lens is 0.10-0.15 mm, and the air space between the front group lens and the rear group lens is 1.0-1.2 mm.
In this embodiment, a stop is disposed between the second lens and the third lens, the air space between the second lens and the stop is 1.05mm, the air space between the third lens and the stop is 0.1mm, and the first filter D1 and the second filter D2 are disposed behind the fifth lens.
In this embodiment, the focal length of the optical system composed of the front group lens and the rear group lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are respectively f1、f2、f3、f4、f5Wherein f is1、f2、f3、f4、f5And f satisfy the following ratio:
-2.5＜f1/f＜-2，5.5＜f2/f＜6，1.5＜f3/f＜1.8，-1.5＜f4/f＜-0.5，1＜f5/f＜2。
the focal power of the optical system formed by the invention is reasonably distributed according to the proportion, and each lens is in a certain proportion relative to the focal length f of the system, so that the aberration of the optical system formed by the invention in the wavelength range of 420-700 nm is reasonably corrected and balanced.
In this embodiment, the first lens satisfies the relation: n is a radical ofd≥1.7，VdLess than or equal to 50; the second lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 30; the third lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 55; the fourth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 30; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 55, wherein NdIs refractive index, VdAbbe constant.
In this embodiment, the first lens is a spherical lens made of glass; the second lens, the third lens, the fourth lens and the fifth lens are aspheric lenses and are all made of plastic materials.
An imaging method of a 1.4mm wide-angle optical system comprises the following steps: the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens and the fifth lens from left to right to form an image.
Example 1: the air space between the first lens and the second lens is 1.67mm, the air space between the third lens and the fourth lens is 0.27mm, the air space between the fourth lens and the fifth lens is 0.12mm, and the air space between the front group lens and the rear group lens is 1.15 mm.
Table 1 shows the radius of curvature R, thickness d, and refractive index N of each lens of the optical lens of example 1dAnd Abbe number Vd。
TABLE 1 detailed lens parameter Table
In the embodiment, five lenses are taken as an example, and by reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the field angle of the lens is effectively enlarged, the total length of the lens is shortened, and the small distortion and the high illumination of the lens are ensured; meanwhile, various aberrations are corrected, and the resolution and the imaging quality of the lens are improved. Each aspherical surface type Z is defined by the following formula:
wherein Z is the distance from the aspheric surface to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic constant; A. b, C, D, E are all high order term coefficients.
Table 2 shows a conic constant k and a high-order term coefficient A, B, C, D, E that can be used for each aspherical lens surface in the present embodiment.
TABLE 2 aspherical lens parameters
In this embodiment, the technical indexes of the optical system are as follows:
(1) focal length: EFFL 1.39 mm; (2) the diaphragm F is 2.0; (3) the field angle: 2w is more than or equal to 155 degrees; (4) optical distortion: less than-65 percent; (5) the diameter of the imaging circle is larger than phi 4.8; (6) the working wave band is as follows: 420-700 nm; (7) the total optical length TTL is less than or equal to 11.5mm, and the optical back intercept BFL is more than or equal to 2.1 mm; (8) the lens is suitable for two million-pixel CCD or CMOS cameras.
In the embodiment of the invention, the first lens has larger refractive index and focal power, so that the system can collect light rays in a larger field range; the second lens adopts an aspheric lens, and the distortion of the optical system is effectively corrected by selecting a proper surface type; a typical structure of front negative and back positive is adopted, and the negative focal power of the front group lens corrects the positive focal power aberration of the back group lens.
The four aspheric lenses correct all high-level aberration and spherical aberration, the light ray incidence angles of the lenses of the front group of lenses and the lenses of the rear group of lenses are limited through reasonable proportion distribution of refractive index and focal power, the smaller light ray incidence angle can be effectively reduced, and the image surface of the optical system is curved; in the rear group lens, a fourth lens with medium refractive index and ultrahigh dispersion effectively corrects chromatic aberration and astigmatism of an imaging system, and the fourth lens and the fifth lens simultaneously play a role in compensating high-temperature and low-temperature characteristics of the system.
Through the optical system formed by the lenses, the total length of the optical path is short, so that the lens is small in size and large in back focus, and can be matched with cameras with various interfaces for use; meanwhile, the system has a large aperture and excellent imaging quality; the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses, so that the lens group is good in image quality, low in cost, high in overall reliability and excellent in cost performance.
As can be seen from FIG. 2, the MTF of the optical system in the visible light band is well-behaved, the MTF value of the 0.8F field is greater than 0.4 at the spatial frequency of 80pl/mm, the MTF value of the central field is greater than 0.5 at the spatial frequency of 160pl/mm, and the requirement of two million high-definition resolution can be achieved. Fig. 3 and 4 are graphs of axial chromatic aberration and lateral chromatic aberration of the optical system. As can be seen from FIG. 3, the maximum axial chromatic aberration of the optical system is 1.86 μm, and as can be seen from FIG. 4, the lateral chromatic aberration of the optical system is well corrected within the range of Airy spots. In conclusion, the optical system has excellent imaging quality and completely meets the requirement of two million-pixel shooting.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A1.4 mm wide-angle optical system, its characterized in that: the device comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a fifth lens which are sequentially arranged at intervals from left to right along a light incident light path;
the first lens is a negative meniscus lens, the second lens is a positive meniscus lens, the first lens and the second lens form a front group lens with negative focal power, the concave surface of the first lens faces the diaphragm, and the concave surface of the second lens faces away from the diaphragm;
the third lens is a double convex positive lens, the fourth lens is a double concave negative lens, and the fifth lens is a double convex positive lens, and the third lens, the fourth lens and the fifth lens form a rear group lens with positive focal power.
2. The 1.4mm wide-angle optical system of claim 1, wherein: the air interval between the first lens and the second lens is 1.65-1.70 mm, the air interval between the third lens and the fourth lens is 0.25-0.30 mm, the air interval between the fourth lens and the fifth lens is 0.10-0.15 mm, and the air interval between the front group of lenses and the rear group of lenses is 1.0-1.2 mm.
3. The 1.4mm wide-angle optical system of claim 1, wherein: optical system composed of front group lens and rear group lensThe focal length of the system is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are respectively f1、f2、f3、f4、f5Wherein f is1、f2、f3、f4、f5And f satisfy the following ratio:
-2.5＜f1/f＜-2，5.5＜f2/f＜6，1.5＜f3/f＜1.8，-1.5＜f4/f＜-0.5，1＜f5/f＜2 。
4. the 1.4mm wide-angle optical system of claim 1, wherein: the first lens satisfies the relation: n is a radical ofd≥1.7，VdLess than or equal to 50; the second lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 30; the third lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 55; the fourth lens satisfies the relation: n is a radical ofd≥1.6，VdLess than or equal to 30; the fifth lens satisfies the relation: n is a radical ofd≥1.5，VdNot less than 55, wherein NdIs refractive index, VdAbbe constant.
5. The 1.4mm wide-angle optical system of claim 1, wherein: the first lens is a spherical lens and is made of a glass material; the second lens, the third lens, the fourth lens and the fifth lens are aspheric lenses and are all made of plastic materials.
6. An imaging method of a 1.4mm wide-angle optical system, characterized by using the 1.4mm wide-angle optical system according to any one of claims 1 to 5, and performing the following steps: the light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens and the fifth lens from left to right to form an image.
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| CN201911170245.8A CN110806633A (en) | 2019-11-26 | 2019-11-26 | 1.4mm wide-angle optical system and imaging method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113031212A (en) * | 2020-12-29 | 2021-06-25 | 福建福光天瞳光学有限公司 | 4K pixel automobile data recorder optical system and imaging method thereof |
| CN114355561A (en) * | 2021-12-31 | 2022-04-15 | 福建福光天瞳光学有限公司 | Imaging lens with limited object distance and imaging method thereof |
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2019
- 2019-11-26 CN CN201911170245.8A patent/CN110806633A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113031212A (en) * | 2020-12-29 | 2021-06-25 | 福建福光天瞳光学有限公司 | 4K pixel automobile data recorder optical system and imaging method thereof |
| CN113031212B (en) * | 2020-12-29 | 2024-01-12 | 福建福光天瞳光学有限公司 | 4K pixel automobile data recorder optical system and imaging method thereof |
| CN114355561A (en) * | 2021-12-31 | 2022-04-15 | 福建福光天瞳光学有限公司 | Imaging lens with limited object distance and imaging method thereof |
| CN114355561B (en) * | 2021-12-31 | 2024-01-12 | 福建福光天瞳光学有限公司 | Limited object distance imaging lens and imaging method thereof |
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