CN212229308U

CN212229308U - Extremely little head gets for instance optical lens group

Info

Publication number: CN212229308U
Application number: CN202021282069.5U
Authority: CN
Inventors: 葛杰; 金兑映; 宋亮
Original assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Current assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2020-12-25
Anticipated expiration: 2030-07-02

Abstract

The utility model discloses a minimal microcephaly image capturing optical lens group, which is provided with a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, wherein the first lens has positive refractive power, and the image side surface of the first lens is a concave surface; the second lens element with negative refractive power has a concave object-side surface; the third lens element with negative refractive power; the fourth lens element with positive refractive power has a convex image-side surface; the fifth lens element with negative refractive power has a concave image-side surface; a diaphragm is arranged in front of the first lens, glue is filled between the first lens and the second lens, and the following conditions are met: T1/TTL is more than 0.36, T1 is the distance from the intersection point of the object side surface of the first lens and the optical axis to the effective diameter of the image side surface of the second lens along the optical axis direction, and TTL is the total lens length; 0.3< R1/R2<0.9, R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens. The lens group can effectively increase the total length of the lens occupied by the small head part and improve the screen occupation ratio of the whole screen.

Description

Extremely little head gets for instance optical lens group

Technical Field

The utility model belongs to the technical field of optical lens group, a minimum microcephaly is got for instance optical lens group is related to.

Background

Along with market demands in recent years, a mobile phone camera also shows a new development trend, and besides requirements for high pixels, large apertures and ultra-thin shapes, a full screen of a smart phone is recently hot and humid in the market, so that the installation space of a lens is narrower, a miniaturized lens is urgently needed to adapt to the development trend of a full-screen mobile phone, and the screen occupation ratio of the full screen is improved.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem, the utility model aims at providing an optical lens group is got for instance to minimum microcephaly can effectually subtract the shared area of camera in the screen, and its first lens effective diameter is enough little to enough long, under the circumstances of guaranteeing imaging quality, the structural design of cooperation lens cone can promote the screen proportion of full face screen.

The utility model relates to a miniatur-head image capturing optical lens group, which is provided with a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis in sequence,

the first lens element with positive refractive power has a concave image-side surface; the second lens element with negative refractive power has a concave object-side surface; the third lens element with negative refractive power; the fourth lens element with positive refractive power has a convex image-side surface; the fifth lens element with negative refractive power has a concave image-side surface; still be equipped with the diaphragm before the first lens, fill with glue between first lens and the second lens, and satisfy following condition:

wherein, T1 is the distance along the optical axis direction from the intersection point of the object side surface of the first lens and the optical axis to the effective diameter of the image side surface of the second lens, and TTL is the total lens length;

wherein, R1 is the curvature radius of the object side surface of the first lens, and R2 is the curvature radius of the image side surface of the first lens.

The utility model discloses an among the minimal microcephaly gets for instance optical lens group, optical lens group still satisfies following condition:

wherein C is the central thickness of the glue between the first lens and the second lens, and C2 is the central thickness of the second lens.

The utility model discloses an extremely microcephaly gets for instance optical lens group can effectually subtract the shared area of camera in the screen, and its first lens effective diameter is enough little to enough long, under the circumstances of guaranteeing imaging quality, the structural design of cooperation lens cone can promote the screen proportion of whole screen.

Drawings

FIG. 1 is a schematic view of the structure of an optical lens group of example 1;

fig. 2 is an on-axis chromatic aberration diagram of an optical lens group of example 1;

FIG. 3 is an astigmatic field curvature diagram of an optical lens group of example 1;

FIG. 4 is a graph of optical distortion of the optical lens group of example 1;

FIG. 5 is a graph of MTF transfer function of an optical lens group of example 1;

FIG. 6 is a schematic structural view of an optical lens group according to example 2;

fig. 7 is an on-axis chromatic aberration diagram of an optical lens group of example 2;

FIG. 8 is an astigmatic field curvature chart of an optical lens assembly of example 2;

FIG. 9 is a graph showing the optical distortion of the optical lens group of example 2;

fig. 10 is a graph of MTF transfer function of the optical lens group of example 2;

FIG. 11 is a schematic structural view of an optical lens group according to example 3;

fig. 12 is an on-axis chromatic aberration diagram of an optical lens group of example 3;

FIG. 13 is an astigmatic field curvature diagram of an optical lens group of example 3;

FIG. 14 is a graph of the optical distortion of the optical lens group of example 3;

fig. 15 is a graph of MTF transfer functions of the optical lens group of example 3.

Detailed Description

The utility model discloses a minimal microcephaly gets for instance optical lens group has set gradually first lens, second lens, third lens, fourth lens and fifth lens along the optical axis by thing side to picture side.

The first lens element with positive refractive power has a concave image-side surface; the second lens element with negative refractive power has a concave object-side surface; the third lens element with negative refractive power; the fourth lens element with positive refractive power has a convex image-side surface; the fifth lens element with negative refractive power has a concave image-side surface. Still be equipped with the diaphragm before the first lens, fill with glue between first lens and the second lens, and satisfy following condition:

the first condition is as follows:

wherein, T1 is the distance along the optical axis direction from the intersection point of the object side surface of the first lens and the optical axis to the effective diameter of the image side surface of the second lens, TTL is the total lens length, and the lens can be extended in small head and the installation space of the lens can be effectively reduced.

And a second condition:

wherein, R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, and the lens can meet the imaging quality and reduce the processing difficulty as much as possible under the condition of meeting the second condition.

And (3) carrying out a third condition:

c is the center thickness of glue between the first lens and the second lens, C2 is the center thickness of the second lens, and the requirement for the third condition is favorable for reducing the difficulty of producing and processing the lenses and assembling.

The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all even-order aspheric plastic lenses, and aspheric coefficients meet the following equation:

wherein Z is an aspheric rise; c is aspheric paraxial curvature; y is the aperture of the lens; k is a conic coefficient; a4 is a 4-degree aspheric coefficient; a6 is a 6-degree aspheric coefficient; a8 is an 8-th aspheric coefficient; a10 is a10 th order aspheric coefficient; a12 is a 12-degree aspheric coefficient; a14 is a14 th order aspheric coefficient; a16 is a 16-degree aspheric coefficient; a18 is an 18 th aspheric coefficient; a20 is a 20-degree aspheric coefficient.

Example 1

Specific design parameters of the lens group are shown in tables 1-3:

table 1:

flour mark	Surface type	Radius of Y	Thickness of	Material
					Article (A)	Spherical surface	Infinite number of elements	400
Stop diaphragm	Spherical surface	Infinite number of elements	0
					1	Aspherical surface	1.893	1.322	1.54:56.0
2	Aspherical surface	2.913	0.255	1.55:55.0
					3	Aspherical surface	-2.569	0.271	1.67:19.4
4	Aspherical surface	372.679	0.200
					5	Aspherical surface	14.330	0.325	1.61:20.4
6	Aspherical surface	5.339	0.277
					7	Aspherical surface	3.819	0.640	1.54:56.0
8	Aspherical surface	-1.762	0.325
					9	Aspherical surface	-1.714	0.287	1.54:56.1
10	Aspherical surface	2.620	0.300
					11	Spherical surface	Infinite number of elements	0.210	1.52:64.1
12	Spherical surface	Infinite number of elements	0.296
					Like IMA	Spherical surface	Infinite number of elements	0

Table 2:

table 3:

T1/TTL	0.4
		R1/R2	0.65
C/C2	0.94

referring to fig. 1, each lens of the lens group has a relatively uniform shape, is convenient for molding production, and has reasonable lens spacing, thereby facilitating the later structural design;

referring to fig. 2, the on-axis chromatic aberration of the illustrated lens group is controlled within ± 0.05.

Referring to fig. 3, the astigmatic field curvature of the lens group shown is controlled within ± 0.05.

Referring to FIG. 4, the optical distortion curve of the lens assembly is shown, the distortion percentage is controlled within + -2%.

Referring to fig. 5, the MTF transfer function graph (optical transfer function) of the lens group can comprehensively reflect the imaging quality of the system, and the smoother the curve shape and the higher the height relative to the X axis prove that the imaging quality of the system is better, and the lens has higher definition.

Example 2

Specific design parameters of the lens group are shown in tables 4 to 6:

table 4:

flour mark	Surface type	Radius of Y	Thickness of	Material
					Article (A)	Spherical surface	Infinite number of elements	400
Stop diaphragm	Spherical surface	Infinite number of elements	0
					1	Aspherical surface	1.976	1.414	1.54:56.0
2	Aspherical surface	6.009	0.253	1.55:55.0
					3	Aspherical surface	-3.231	0.271	1.67:19.4
4	Aspherical surface	17.053	0.179
					5	Aspherical surface	11.781	0.353	1.61:20.4
6	Aspherical surface	5.723	0.244
					7	Aspherical surface	3.121	0.695	1.54:56.0
8	Aspherical surface	-1.840	0.341
					9	Aspherical surface	-1.753	0.308	1.54:56.1
10	Aspherical surface	2.071	0.300
					11	Spherical surface	Infinite number of elements	0.21	1.52:64.1
12	Spherical surface	Infinite number of elements	0.370
					Like IMA	Spherical surface	Infinite number of elements	0

Table 5:

table 6:

T1/TTL	0.4
		R1/R2	0.33
C/C2	0.93

referring to fig. 7, the on-axis chromatic aberration of the illustrated lens group is controlled within ± 0.05.

Referring to fig. 8, the astigmatic field curvature of the lens group shown is controlled within ± 0.05.

Referring to fig. 9, the optical distortion curve of the lens assembly is shown, the distortion percentage is controlled within 3%.

Referring to fig. 10, the MTF transfer function graph (optical transfer function) of the lens group shown can comprehensively reflect the imaging quality of the system, and the smoother the curve shape and the higher the height relative to the X axis, prove that the imaging quality of the system is better, and the lens has higher definition.

Example 3

Specific design parameters of the lens assembly are shown in tables 7-9:

table 7:

flour mark	Surface type	Radius of Y	Thickness of	Material
					Article (A)	Spherical surface	Infinite number of elements	400
Stop diaphragm	Spherical surface	Infinite number of elements	0
					1	Aspherical surface	2.028	1.221	1.54:56.0
2	Aspherical surface	2.404	0.260	1.55:55.0
					3	Aspherical surface	-3.497	0.353	1.67:19.4
4	Aspherical surface	15.807	0.192
					5	Aspherical surface	11.366	0.363	1.61:20.4
6	Aspherical surface	5.788	0.273
					7	Aspherical surface	2.980	0.723	1.54:56.0
8	Aspherical surface	-1.945	0.363
					9	Aspherical surface	-1.825	0.314	1.54:56.1
10	Aspherical surface	2.268	0.3
					11	Spherical surface	Infinite number of elements	0.21	1.52:64.1
12	Spherical surface	Infinite number of elements	0.392
					Like IMA	Spherical surface	Infinite number of elements	0

Table 8:

table 9:

T1/TTL	0.37
		R1/R2	0.84
C/C2	0.74

referring to fig. 12, the on-axis chromatic aberration of the illustrated lens group is controlled within ± 0.05.

Referring to fig. 13, the astigmatic field curvature of the lens group shown is controlled within ± 0.08.

Referring to fig. 14, the optical distortion curve of the lens assembly is shown, the distortion percentage is controlled to be in the range of 2%.

Referring to fig. 15, the MTF transfer function graph (optical transfer function) of the lens group shown can comprehensively reflect the imaging quality of the system, and the smoother the curve shape and the higher the height relative to the X axis, prove that the imaging quality of the system is better, and the lens has higher definition.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the spirit of the present invention, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a minimumhead is got like optical lens group, has set gradually first lens, second lens, third lens, fourth lens and fifth lens along the optical axis from the thing side to image side which characterized in that:

2. The very small head imaging optical lens group of claim 1, wherein said optical lens group further satisfies the following condition: