CN111736324A - A wide-angle optical lens - Google Patents

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

A wide-angle optical lens

technical field

One or more embodiments of this specification relate to the technical field of optical lenses, and in particular, to a wide-angle optical lens.

Background technique

With the advancement of technology, the improvement of living standards, and the application of the 5G era, the application of lenses has become more and more extensive. People's needs for cameras are not limited to ordinary shooting effects, but also require a wider field of view and clear image quality. , Stronger recognition, especially for optical lens components of imaging systems on automobiles and electronic products, an optical lens with EFL of 3.2, BFL of 6.0, and FOV greater than or equal to 110° is required. Optical lenses that meet the above specifications are still missing.

SUMMARY OF THE INVENTION

In view of this, the purpose of one or more embodiments of this specification is to provide a wide-angle optical lens to meet the requirements of an EFL of 3.2, a BFL of 6.0, and a FOV greater than or equal to 110°.

Based on the above purpose, one or more embodiments of the present specification provide a wide-angle optical lens. The optical system of the lens is sequentially provided along the incident direction of light from front to back: a first lens with negative refractive power and a positive refractive power. the second lens, the third lens with positive refractive power and the fourth lens with negative refractive power;

The first lens is a double-concave large lens facing the object side, the second lens is a double-convex lens, the large lens is facing the object side, the third lens is a double-convex lens, and the fourth lens is a small straw hat lens;

The distance between the same side edge of the first lens and the second lens is 3.24mm, and the distance between the second lens and the distal edge of the fourth lens is 6.03mm, and the third lens and the fourth lens are cemented to form a cemented lens with positive refractive power ;

The d-light refractive index of the first lens is not less than 1.5174, and the d-light Abbe constant is not less than 52.15;

The refractive index of d light of the second lens is not less than 1.8344, and the Abbe constant of d light is not less than 37.21;

The refractive index of d light of the third lens is not less than 1.7015, and the Abbe constant of d light is not less than 41.15;

The d-light refractive index of the fourth lens is not less than 1.9228, and the d-light 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 to limit the interval between the edges on the same side of the first lens and the second lens to 3.24 mm.

Preferably, a spacer ring is connected between the second lens and the third lens, and the spacer ring is used to limit the space between the second lens and the distal edge of the fourth lens to 6.03mm.

Preferably, the surface of the first lens is coated 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, in the optical system of the lens, along the incident direction of light from front to back, a filter is also provided after the fourth lens.

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-ZF72A.

It can be seen from the above that the wide-angle optical lens provided by one or more embodiments of this specification satisfies that the maximum mirror surface (Maximagecircle) is φ7.0mm, the effective focal length (EFL) is 3.23mm, and the optical back focal length (BFL) is 6.05mm mm, the optical front focal length (FFL) is 4.44mm, the focal ratio (F/NO) is 2.46mm, the diagonal field of view (FOV-D) is 132°, and the horizontal field of view (FOV-H) is 106 °, the vertical field of view (FOV-V) is 59.6°, this wide-angle optical lens is suitable for imaging systems on automobiles and electronic products, especially suitable for 4K or 1080P resolution, 5 million pixels on automobiles and electronic products. imaging system.

Description of drawings

In order to more clearly illustrate one or more embodiments of the present specification or the technical solutions in the prior art, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, in the following description The accompanying drawings are only one or more embodiments of the present specification, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of the composition of an optical lens lens according to one or more embodiments of the specification;

2 is a schematic diagram of an optical path of an optical lens according to one or more embodiments of the specification;

FIG. 3 is a schematic diagram of the internal structure of the lens barrel of the optical lens according to one or more embodiments of the specification, wherein 8 is the image side.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to specific embodiments.

It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of the present specification shall have the usual meanings understood by those with ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and similar terms used in one or more embodiments of this specification do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

One or more embodiments of the present specification disclose a wide-angle optical lens. The optical system of the lens is sequentially provided along the incident direction of light from front to back: a first lens 1 with negative refractive power, a first lens with positive refractive power Two lenses 3 and a fourth lens 6 with negative refractive power, wherein the first lens 1 is a double-concave large lens facing the object side, the second lens 3 is a double-convex lens, the large lens is facing the object side, and the third lens 5 is a double-convex lens type lens, the fourth lens 6 is a straw hat lens, the distance between the edge of the first lens 1 and the second lens 3 on the same side is 3.24mm, the distance between the second lens 3 and the distal edge of the fourth lens 6 is 6.03mm, The three lenses 5 and the fourth lens 6 are cemented to form a cemented lens with positive refractive power, and the spacing between the lenses is shown in FIG. 2 .

The refractive index of d light of the first lens 1 is not less than 1.5174, and the Abbe constant of d light is not less than 52.15;

The refractive index of d light of the second lens 3 is not less than 1.8344, and the Abbe constant of d light is not less than 37.21;

The refractive index of d light of the third lens 5 is not less than 1.7015, and the Abbe constant of d light is not less than 41.15;

The d-light refractive index of the fourth lens 6 is not less than 1.9228, and the d-light Abbe constant is not less than 18.90.

In the wide-angle optical lens disclosed in the embodiments of this specification, the function of the first lens 1 is to expand the field of view and enhance the light flux. (BFL) is 6.05mm, optical front focal length (FFL) is 4.44mm, focal ratio (F/NO) is 2.46mm, its diagonal field of view (FOV-D) is 132°, horizontal field of view (FOV) -H) is 106°, and the vertical field of view (FOV-V) is 59.6°. The wide-angle optical lens disclosed in the embodiments of this specification is suitable for imaging systems on automobiles and electronic products, especially for 4K or 1080P resolution, Imaging systems on 5-megapixel automobiles and electronic products.

As an embodiment, a fixed aperture 2 is connected between the first lens 1 and the second lens 3, and the fixed aperture 2 is used to limit the interval between the edges of the first lens 1 and the second lens 3 on the same side to 3.24 mm, The aforementioned fixed diaphragm 2 is an entity that restricts the light beam in the optical system, and can be the edge or frame of the lens. The specific specifications of the fixed diaphragm 2 are determined according to the specifications of the lens to which the lens is assembled. The structure is a conventional technical means in the field, and is not within the protection scope of the present application, and will not be described in detail.

As an embodiment, a spacer ring 4 is connected between the second lens 3 and the third lens 5, and the spacer ring 4 is used to limit the distance between the second lens 3 and the fourth lens 6 at the distal edge of 6.03 mm. The aforementioned The spacer ring 4 is a common component used in lenses to limit the distance between adjacent lenses. The specific specifications of the spacer ring 4 are determined according to the specifications of the lens to which the lens is assembled. The specific structure of the spacer ring 4 is conventional in the field. The technical means are not within the scope of protection of the present application and will not be described in detail.

As an embodiment, the surface of the first lens 1 is coated with a waterproof film. For example, the coating method includes: firstly coating the base of the first lens 1 with a wear-resistant film with silicone, and then using IPC technology, using ion bombardment for pre-cleaning before anti-reflection coating, using high-hardness zirconium dioxide (Zr02) material for vacuum plating of multi-layer anti-reflection coating after cleaning, and finally coating with a contact angle of more than 110° The Zhongke 2RW type waterproof membrane. By being coated with a waterproof film, the contact area between water, dust and other contaminants and the lens lens is reduced to 110°, making it difficult to adhere to the surface of the lens lens, increasing waterproof, anti-fog, dust-proof, anti-fingerprint and other anti-pollution For example, the thickness of the waterproof membrane can be 650nm or 850nm.

As an embodiment, the first lens 1 , the second lens 3 , the third lens 5 and the fourth lens 6 all use glass lenses, so as to avoid the disadvantages of the plastic lenses being easily affected by temperature, resulting in degraded image quality and easy aging.

As an embodiment, in the optical system of the optical lens, a filter 7 is further provided after the fourth lens 6 along the incident direction of light from front to back.

As an 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 filter 7 , that is, the above lenses and the filter 7 are all installed in the lens Inside the barrel, after being assembled with the lens barrel, the distance from the front surface of the first lens to the image is 15.29mm. For example, the size of the threaded fastener of the lens barrel can be set to M12*0.5P.

As an embodiment, the outer diameter of the lens barrel is 14 mm, the outer diameter of the first lens is 9 mm, the outer diameters of the fixed diaphragm, the second lens, the spacer ring, the third lens and the fourth lens are all 6 mm, and the length of the lens barrel is 11.41mm.

As an 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-ZF72A.

Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary, and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the spirit of the present disclosure, the above embodiments or Technical features in different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of one or more embodiments of this specification as described above, which are not in detail for the sake of brevity supply.

Where specific details are set forth to describe exemplary embodiments of the present disclosure, it will be apparent to those skilled in the art that the specification may be practiced without or with changes to these specific details or more embodiments. Accordingly, these descriptions are to be considered illustrative rather than restrictive.

The embodiment or embodiments of this specification are intended to cover all such alternatives, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present specification should be included within the protection 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.

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