CN212808766U

CN212808766U - Intelligence house control optical lens

Info

Publication number: CN212808766U
Application number: CN202021150044.XU
Authority: CN
Inventors: 洪坚; 吴喆明; 史晓梅; 耿永飞; 刘安民
Original assignee: Sirtec International Suzhou Co ltd
Current assignee: Sirtec International Suzhou Co ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-03-26
Anticipated expiration: 2030-06-19

Abstract

The utility model provides an intelligence house control optical lens, its workable, simple structure, and have big visual angle, high resolution, the confocal function of day night. It includes first lens, second lens, third lens, fourth lens along the optical axis in proper order from the object side to the image side, its characterized in that: the first lens has negative focal power, and the image side surface of the first lens is a concave surface; the second lens has positive focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface; an IR color filter, protective glass and IMA are sequentially arranged behind the image side surface of the fourth lens; the first lens and the second lens are both glass lenses, and the third lens and the fourth lens are plastic aspheric lenses.

Description

Intelligence house control optical lens

Technical Field

The utility model relates to an optical imaging's technical field specifically is an intelligence house control optical lens.

Background

With the progress of technology and the continuous improvement of field of view, smart home monitoring equipment and technology are rapidly developed and gradually popularized, and home monitoring is an important part of the field of monitoring lenses. Because the intelligent home monitoring lens gradually tends to be miniaturized and develops in the direction of a large-view monitoring visual angle, the lens with the miniaturized volume and the high resolution is required, and the day and night confocal function can be realized. But the current market has less special lenses, and the general volume is bigger, the resolution is lower, and the cost is higher.

Disclosure of Invention

To the problem, the utility model provides an intelligence house control optical lens, its workable, simple structure, and have big visual angle, high resolution, the confocal function of day night.

An intelligent home monitoring optical lens, the technical scheme is as follows: it includes first lens, second lens, third lens, fourth lens along the optical axis in proper order from the object side to the image side, its characterized in that: the first lens has negative focal power, and the image side surface of the first lens is a concave surface;

the second lens has positive focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface;

the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface;

an IR color filter, protective glass and IMA are sequentially arranged behind the image side surface of the fourth lens;

the first lens and the second lens are both glass lenses, and the third lens and the fourth lens are plastic aspheric lenses.

It is further characterized in that:

the third lens and the fourth lens are combined cemented lenses or two separated lenses;

the object side surface of the first lens is a convex surface or a concave surface;

the image side surface of the fourth lens is a concave surface or a convex surface;

the difference between the Abbe numbers V1 and V2 of at least two adjacent lenses in all the optical lenses satisfies the following condition: 10 < | V1-V2| < 25;

the optical lens satisfies: BFL/TTL is less than or equal to 0.35, BFL is the distance from the center of the image side surface of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis, TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis;

the optical lens satisfies: the FOV/h/D is less than or equal to 5.3, the FOV is the maximum field angle of the optical lens, the D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and the h is the image height corresponding to the maximum field angle of the optical lens;

the maximum field angle FOV of the optical lens, the whole group of focal length values F of the optical lens and the image height h corresponding to the maximum field angle of the optical lens satisfy the following conditions: (FOV multiplied by F)/h is more than or equal to 50;

the optical lens satisfies: TTL/F is less than or equal to 7, TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and F is the integral focal length value of the optical system;

the lens further comprises a diaphragm, and the diaphragm is arranged between the image side surface of the first lens and the object side surface of the second lens.

The vehicle-mounted lens adopts four lenses, has a simple structure, is easy to process, and realizes the miniaturization and light weight of the vehicle-mounted lens. The adoption of the glass-plastic mixed small-caliber lens is beneficial to reducing the cost of the monitoring lens; and the relatively large visual angle range can realize a large monitoring visual angle range.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention (the object side is at the leftmost position, and the image side is at the rightmost position);

FIG. 2 is a graph of MTF for an embodiment of the present invention;

FIG. 3 is a defocus plot of an embodiment of the present invention;

FIG. 4 is a defocus plot of the infrared band (940nm) of an embodiment of the present invention.

Detailed Description

An intelligent home monitoring optical lens is shown in figure 1: the lens comprises a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 in sequence from an object side surface to an image side surface along an optical axis;

a color filter IR, protective glass CG and IMA are sequentially arranged behind the image side surface of the fourth lens;

the first lens and the second lens are both glass lenses, and the third lens and the fourth lens are plastic aspheric lenses;

the first lens element L1 has negative power, and its image-side surface is concave, and its object-side surface is convex or concave;

the second lens L2 has positive focal power, and has a convex object-side surface and a convex image-side surface;

the third lens element L3 has positive focal power, and has a convex object-side surface and a convex image-side surface;

the fourth lens element L4 has negative power, and has a concave object-side surface and a concave or convex image-side surface.

Specific examples, see fig. 1: the lens comprises a first lens L1, a diaphragm STOP, a second lens L2, a third lens L3, a fourth lens L4, a color filter IR, protective glass CG and IMA in sequence from an object side surface to an image side surface along an optical axis, wherein the first lens L1 has negative focal power, and the object side surface and the image side surface of the first lens are concave;

the fourth lens element L4 has a negative refractive power, and has a concave object-side surface and a concave image-side surface.

The optical parameters of the various components are shown in Table 1:

TABLE 1

When the radii of curvature of the surfaces of the diaphragm, the IR filter and the cover glass in Table 1 are Infinity, this surface is represented as a plane.

The comprehensive parameters of the optical lens are shown in table 2:

item	TTL/F	FOV×F/h	FOV/h/D	BFL/TTL
					Range of	≤7	≥50	≤5.3	≤0.35

TABLE 2

The aspherical surface of the lens provided in the embodiment satisfies the following equation:

where z (h) is a distance vector from the aspheric vertex when the aspheric surface has a height h in the optical axis direction, c is 1/r, r represents a curvature radius of the aspheric mirror surface, k is a conic coefficient, and A, B, C, D, E is an aspheric high-order coefficient.

In the specific embodiment, the values of the coefficients are shown in table 3:

number of noodles

K

A

B

C

D

E

S6

0

1.439e-4

9.774e-5

-6.938e-5

-1.951e-6

0

S7

0

4.010e-3

1.144e-3

-6.256e-4

4.914e-5

1.391e-6

S8

0

0.010

5.805e-4

-2.419e-4

2.925e-5

2.837e-6

S9

0

0.016

-3.4564e-3

4.564e-4

-1.611e-5

0

TABLE 3

The principle is as follows: four lenses are adopted, the structure is simple, the processing is easy, and the miniaturization and the light weight of the lens are realized. The adoption of the glass-plastic mixed small-caliber lens is beneficial to reducing the cost of the monitoring lens; and the relatively large visual angle range can realize a large monitoring visual angle range.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides an intelligence house monitoring optical lens, its includes first lens, second lens, third lens, fourth lens, its characterized in that in proper order from the object side to the image side along the optical axis: the first lens has negative focal power, and the image side surface of the first lens is a concave surface;

2. The intelligent home monitoring optical lens of claim 1, wherein: the third lens and the fourth lens are combined cemented lenses or two separated lenses.

3. The intelligent home monitoring optical lens of claim 1, wherein: the object side surface of the first lens is a convex surface or a concave surface.

4. The intelligent home monitoring optical lens of claim 1, wherein: the image side surface of the fourth lens is concave or convex.

5. The intelligent home monitoring optical lens of claim 1, wherein the difference between abbe numbers V1 and V2 of at least two adjacent optical lenses in all optical lenses satisfies: 10 < | V1-V2| < 25.

6. The intelligent home monitoring optical lens of claim 1, wherein the optical lens satisfies the following conditions: BFL/TTL is less than or equal to 0.35, BFL is the distance from the center of the image side surface of the last lens of the optical lens to the imaging surface of the optical lens on the optical axis, and TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis.

7. The intelligent home monitoring optical lens of claim 1, wherein the optical lens satisfies the following conditions: the FOV/h/D is less than or equal to 5.3, the FOV is the maximum field angle of the optical lens, D is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the optical lens, and h is the image height corresponding to the maximum field angle of the optical lens.

8. The intelligent home monitoring optical lens according to claim 1, wherein a maximum field angle FOV of the optical lens, a whole group focal length value F of the optical lens, and an image height h corresponding to the maximum field angle of the optical lens satisfy: (FOV XF)/h.gtoreq.50.

9. The intelligent home monitoring optical lens of claim 1, wherein the optical lens satisfies the following conditions: TTL/F is less than or equal to 7, TTL is the distance between the center of the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and F is the integral focal length value of the optical system.

10. The intelligent home monitoring optical lens of claim 1, wherein: the lens further comprises a diaphragm, and the diaphragm is arranged between the image side surface of the first lens and the object side surface of the second lens.