CN111736324A - Wide-angle optical lens - Google Patents
Wide-angle optical lens Download PDFInfo
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- CN111736324A CN111736324A CN202010543717.6A CN202010543717A CN111736324A CN 111736324 A CN111736324 A CN 111736324A CN 202010543717 A CN202010543717 A CN 202010543717A CN 111736324 A CN111736324 A CN 111736324A
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings 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
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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Abstract
One or more embodiments of the present specification provide a wide-angle optical lens including a first lens having a negative power, a second lens having a positive power, a third lens having a positive power, and a fourth lens having a negative power, satisfying a maximum specular surface (maximage circle) of phi 7.0mm, an Effective Focal Length (EFL) of 3.23mm, a back optical focal length (BFL) of 6.05mm, a front optical focal length (FFL) of 4.44mm, a focal ratio (F/NO) of 2.46mm, a diagonal field angle (FOV-D) of 132 °, a horizontal field angle (FOV-H) of 106 °, a vertical field angle (FOV-V) of 59.6 °, which is suitable for an imaging system on automobiles, electronic products, and particularly suitable for an imaging system on automobiles, electronic products of 4K or 1080P resolution, 500 pixels.
Description
Technical Field
One or more embodiments of the present disclosure relate to the field of optical lenses, and more particularly, to a wide-angle optical lens.
Background
With the improvement of science and technology, the improvement of living standard and the application in the 5G era, the application of the lens is more and more extensive, people's demand on the camera is not limited to the common shooting effect, and simultaneously, the demand has a wider field of view, and the imaging quality is clear, the degree of identification is stronger, especially for the optical lens component of the imaging system on the automobile and the electronic product, an optical lens meeting the requirements that the EFL is 3.2, the BFL is 6.0, and the FOV is greater than or equal to 110 degrees is needed, and the optical lens meeting the specification parameters is still lacked in the prior art.
Disclosure of Invention
In view of the above, one or more embodiments of the present disclosure are directed to a wide-angle optical lens, which satisfies the requirement of an EFL of 3.2, a BFL of 6.0, and a FOV greater than or equal to 110 °.
In view of the above, one or more embodiments of the present disclosure provide a wide-angle optical lens, in which an optical system of the lens is provided with: a first lens having a negative power, a second lens having a positive power, a third lens having a positive power, and a fourth lens having a negative power;
the first lens is a biconcave large-surface object-side lens, the second lens is a biconvex lens and a large-surface object-side lens, the third lens is a biconvex lens, and the fourth lens is a small grass cap lens;
the interval between the edges of the first lens and the second lens on the same side is 3.24mm, the interval between the edges of the second lens and the fourth lens at the far end is 6.03mm, and the third lens and the fourth lens are cemented to form a cemented lens with positive focal power;
the d-optical refractive index of the first lens is not less than 1.5174, and the d-optical Abbe constant is not less than 52.15;
the d-light refractive index of the second lens is not less than 1.8344, and the d-light Abbe constant is not less than 37.21;
the d-light refractive index of the third lens is not less than 1.7015, and the d-light Abbe constant is not less than 41.15;
the d-optical refractive index of the fourth lens is not less than 1.9228, and the d-optical Abbe constant is not less than 18.90.
Preferably, a fixed diaphragm is connected between the first lens and the second lens, and the fixed diaphragm is used for limiting the interval of the edges of the first lens and the second lens on the same side to 3.24 mm.
Preferably, a spacing ring is connected between the second lens and the third lens, and the spacing ring is used for limiting the spacing between the second lens and the distal edge of the fourth lens to 6.03 mm.
Preferably, the surface of the first lens is plated with a waterproof film.
Preferably, the first lens, the second lens, the third lens and the fourth lens are all made of glass lenses.
Preferably, a filter is further arranged behind the fourth lens in the optical system of the lens along the direction of incidence of the light rays from front to back.
Preferably, the material of the first lens is H-KF6, the material of the second lens is H-ZLAF53B, the material of the third lens is H-ZBAF20, and the material of the fourth lens is H-ZF 72A.
As can be seen from the above description, the wide-angle optical lens provided in one or more embodiments of the present disclosure satisfies the requirements that the maximum specular surface (maximage circle) is 7.0mm, the Effective Focal Length (EFL) is 3.23mm, the optical Back Focal Length (BFL) is 6.05mm, the optical Front Focal Length (FFL) is 4.44mm, the focal ratio (F/NO) is 2.46mm, the diagonal field angle (FOV-D) is 132 °, the horizontal field angle (FOV-H) is 106 °, and the vertical field angle (FOV-V) is 59.6 °, and is suitable for an imaging system on automobiles and electronic products, and is particularly suitable for an imaging system on automobiles and electronic products with 4K or 1080P resolution and 500 ten thousand pixels.
Drawings
In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only one or more embodiments of the present specification, and that other drawings may be obtained by those skilled in the art without inventive effort from these drawings.
Fig. 1 is a schematic view of an optical lens assembly according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic optical path diagram of an optical lens according to one or more embodiments of the present disclosure;
fig. 3 is a schematic view of an internal structure of a lens barrel of an optical lens barrel according to one or more embodiments of the present disclosure, where 8 is an image space.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, the present disclosure is further described in detail below with reference to specific embodiments.
It is to be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present specification should have the ordinary meaning as understood by those of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in one or more embodiments of the specification is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
One or more embodiments of the present specification disclose a wide-angle optical lens, in an optical system of the lens, there are sequentially disposed, along a direction in which light is incident from front to back: the lens comprises a first lens 1 with negative focal power, a second lens 3 with positive focal power and a fourth lens 6 with negative focal power, wherein the first lens 1 is a biconcave large-surface-to-object, the second lens 3 is a biconvex lens and a large-surface-to-object, the third lens 5 is a biconvex lens, the fourth lens 6 is a grass cap lens, the interval between the same side edges of the first lens 1 and the second lens 3 is 3.24mm, the interval between the distal end edges of the second lens 3 and the fourth lens 6 is 6.03mm, the third lens 5 and the fourth lens 6 are glued to form a cemented lens with positive focal power, and the distance between the lenses is shown in fig. 2.
The d-optical refractive index of the first lens 1 is not less than 1.5174, and the d-optical Abbe constant is not less than 52.15;
the d-light refractive index of the second lens 3 is not less than 1.8344, and the d-light Abbe constant is not less than 37.21;
the refractive index of d light of the third lens 5 is not less than 1.7015, and Abbe constant of d light is not less than 41.15;
the d-optical refractive index of the fourth lens 6 is not less than 1.9228, and the d-optical Abbe constant is not less than 18.90.
The wide-angle optical lens disclosed in the embodiment of the present specification, wherein the first lens 1 functions to expand a field of view and enhance luminous flux, and the lens satisfies that a maximum specular surface (maximage circle) is 7.0mm, an Effective Focal Length (EFL) is 3.23mm, a back optical focal length (BFL) is 6.05mm, a front optical focal length (FFL) is 4.44mm, a focal ratio (F/NO) is 2.46mm, a diagonal field angle (FOV-D) is 132 °, a horizontal field angle (FOV-H) is 106 °, a vertical field angle (FOV-V) is 59.6 °, and the wide-angle optical lens disclosed in the embodiment of the present specification is suitable for an imaging system on an automobile or an electronic product, and is particularly suitable for an imaging system on an automobile or an electronic product with a resolution of 4K or 1080P and 500 ten thousand pixels.
As an embodiment, a fixed diaphragm 2 is connected between the first lens 1 and the second lens 3, the fixed diaphragm 2 is used for limiting an interval between edges of the same side of the first lens 1 and the second lens 3 to 3.24mm, the fixed diaphragm 2 is an entity playing a role in limiting light beams in an optical system, and may be an edge or a frame of the lens, a specific specification of the fixed diaphragm 2 is determined according to a specification of a lens assembled by the lens, and a specific structure of the fixed diaphragm 2 is a conventional technical means in the field, and is not in a protection scope of the present application, and is not described in detail.
As an embodiment, a spacer ring 4 is connected between the second lens element 3 and the third lens element 5, the spacer ring 4 is used for limiting the distance between the distal edges of the second lens element 3 and the fourth lens element 6 to 6.03mm, the spacer ring 4 is a component commonly used in a lens barrel for limiting the distance between adjacent lens elements, the specific specification of the spacer ring 4 is determined according to the specification of the lens barrel to which the lens barrel is assembled, and the specific structure of the spacer ring 4 is a conventional technical means in the art, and is not in the protection scope of the present application, and is not described in detail.
As an embodiment, the surface of the first lens 1 is plated with a waterproof film, for example, the plated film includes: firstly, a film base of the first lens 1 is coated with a wear-resistant film with organic silicon, then the IPC technology is adopted, ion bombardment is used for pre-cleaning before the antireflection film is coated, after cleaning, high-hardness zirconium dioxide (Zr02) material is used for vacuum plating of a plurality of antireflection film layers, and finally, a Chinese 2RW type waterproof film with a contact angle of more than 110 degrees is coated. By plating the waterproof film, the contact area between dirt such as water and dust and the lens is reduced to 110 degrees, so that the dirt is not easy to adhere to the surface of the lens, and the anti-pollution functions such as water resistance, fog resistance, dust resistance and fingerprint resistance are added, for example, the thickness of the waterproof film can be 650nm or 850 nm.
As an implementation mode, the first lens 1, the second lens 3, the third lens 5 and the fourth lens 6 are all made of glass lenses, and the defects that plastic lenses are easily affected by temperature to cause image quality reduction and aging are easily overcome.
In one embodiment, the optical system of the optical lens further includes a filter 7 disposed after the fourth lens 6 along the incident direction of the light from front to back.
In one embodiment, a lens barrel is installed outside the first lens 1, the second lens 3, the third lens 5, the fourth lens 6 and the optical filter 7, that is, the above lenses and the optical filter 7 are all installed in the lens barrel, and after being assembled with the lens barrel, the front end face of the first lens is 15.29mm from the image side, for example, the screw fastener size of the lens barrel may be set to M12 × 0.5P.
In one embodiment, the outer diameter of the lens barrel is 14mm, the outer diameter of the first lens is 9mm, the outer diameters of the fixed diaphragm, the second lens, the spacing ring, the third lens and the fourth lens are all 6mm, and the length of the lens barrel is 11.41 mm.
In one embodiment, the material of the first lens 1 is H-KF6, the material of the second lens 3 is H-ZLAF53B, the material of the third lens 5 is H-ZBAF20, and the material of the fourth lens 6 is H-ZF 72A.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the spirit of the present disclosure, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present description as described above, which are not provided in detail for the sake of brevity.
Where specific details are set forth in order to describe example embodiments of the disclosure, it will be apparent to one skilled in the art that one or more embodiments of the disclosure may be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
It is intended that the one or more embodiments of the present specification embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of one or more embodiments of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (7)
1. A wide-angle optical lens is characterized in that an optical system of the lens is provided with the following components in sequence from the front to the back incidence direction: a first lens having a negative power, a second lens having a positive power, a third lens having a positive power, and a fourth lens having a negative power;
the first lens is a biconcave large-surface object space, the second lens is a biconvex lens and a large-surface object space, the third lens is a biconvex lens, and the fourth lens is a small straw hat lens;
the interval between the edges of the first lens and the second lens on the same side is 3.24mm, the interval between the edges of the second lens and the fourth lens at the far ends is 6.03mm, and the third lens and the fourth lens are cemented to form a cemented lens with positive focal power;
the d-optical refractive index of the first lens is not less than 1.5174, and the d-optical Abbe constant is not less than 52.15;
the d-optical refractive index of the second lens is not less than 1.8344, and the d-optical Abbe constant is not less than 37.21;
the d-optical refractive index of the third lens is not less than 1.7015, and the d-optical Abbe constant is not less than 41.15;
the d-optical refractive index of the fourth lens is not less than 1.9228, and the d-optical Abbe constant is not less than 18.90.
2. The wide-angle optical lens as claimed in claim 1, wherein a fixed diaphragm is connected between the first lens and the second lens, and the fixed diaphragm is used for limiting the interval between the edges of the first lens and the second lens on the same side to 3.24 mm.
3. The wide-angle optical lens of claim 1, wherein a spacer ring is coupled between the second lens and the third lens, the spacer ring configured to limit a spacing between the second lens and the distal edge of the fourth lens to 6.03 mm.
4. The wide-angle optical lens of claim 1, wherein the first lens surface is coated with a water-resistant film.
5. The wide-angle optical lens of claim 1, wherein the first lens, the second lens, the third lens and the fourth lens are all glass lenses.
6. The wide-angle optical lens as claimed in claim 1, wherein a filter is further disposed behind the fourth lens in an optical system of the lens along a direction of incidence of light from front to back.
7. The wide-angle optical lens of claim 1, wherein the material of the first lens is H-KF6, the material of the second lens is H-ZLAF53B, the material of the third lens is H-ZBAF20, and the material of the fourth lens is H-ZF 72A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010543717.6A CN111736324A (en) | 2020-06-15 | 2020-06-15 | Wide-angle optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010543717.6A CN111736324A (en) | 2020-06-15 | 2020-06-15 | Wide-angle optical lens |
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| CN111736324A true CN111736324A (en) | 2020-10-02 |
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| CN202010543717.6A Pending CN111736324A (en) | 2020-06-15 | 2020-06-15 | Wide-angle optical lens |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114609761A (en) * | 2022-02-23 | 2022-06-10 | 广东弘景光电科技股份有限公司 | Large-aperture wide-angle monitoring optical system with high-pixel large target surface and camera module applied to same |
| CN114859525A (en) * | 2022-05-09 | 2022-08-05 | 杭州海康威视数字技术股份有限公司 | Optical lens and camera |
| CN115826251A (en) * | 2023-02-23 | 2023-03-21 | 沂普光电(天津)有限公司 | VR lens structure and VR display system |
-
2020
- 2020-06-15 CN CN202010543717.6A patent/CN111736324A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114609761A (en) * | 2022-02-23 | 2022-06-10 | 广东弘景光电科技股份有限公司 | Large-aperture wide-angle monitoring optical system with high-pixel large target surface and camera module applied to same |
| CN114609761B (en) * | 2022-02-23 | 2024-06-21 | 广东弘景光电科技股份有限公司 | High-pixel large-target-surface large-aperture wide-angle monitoring optical system and camera module applied by same |
| CN114859525A (en) * | 2022-05-09 | 2022-08-05 | 杭州海康威视数字技术股份有限公司 | Optical lens and camera |
| CN114859525B (en) * | 2022-05-09 | 2023-11-14 | 杭州海康威视数字技术股份有限公司 | Optical lens and camera |
| CN115826251A (en) * | 2023-02-23 | 2023-03-21 | 沂普光电(天津)有限公司 | VR lens structure and VR display system |
| CN115826251B (en) * | 2023-02-23 | 2023-05-02 | 沂普光电(天津)有限公司 | VR lens structure and VR display system |
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