CN209070186U

CN209070186U - A kind of biprism periscopic mobile lens

Info

Publication number: CN209070186U
Application number: CN201821703560.3U
Authority: CN
Inventors: 金兑映; 司丛芳
Original assignee: Liaoning Zhonglan Electronic Technology Co Ltd
Current assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Priority date: 2018-10-21
Filing date: 2018-10-21
Publication date: 2019-07-05
Anticipated expiration: 2028-10-21

Abstract

The utility model discloses a kind of biprism periscopic mobile lens, and the first eyeglass L with negative refracting power is followed successively by from object side to image side₁, make the curved reflective optical devices of optical path, aperture diaphragm S, the second eyeglass L with negative refracting power₂, third eyeglass L with positive refracting power₃, the 4th eyeglass L with negative refracting power₄, the 5th eyeglass L with positive refracting power₅, make the curved reflective optical devices of optical path.First to the 5th eyeglass is plastic aspherical element eyeglass, and wherein the refractive index and Abbe number of third and the 5th eyeglass are disposed as 1.632 and 23.5, and the first eyeglass, the refractive index of the second eyeglass and the 4th eyeglass and Abbe number are disposed as 1.53 and 55.8.The one the second reflecting elements are BK7 material.

Description

Biprism periscopic mobile phone lens

Technical Field

The utility model relates to a biprism periscope formula cell-phone camera lens belongs to cell-phone camera lens technical field.

Background

With the development of smart phones, the smart phones are lighter and thinner, the requirement on the length of the lens module is shorter and shorter, and the more compact the lens is, the tolerance sensitivity and the assembly difficulty of the lens module are correspondingly improved. The periscopic mobile phone lens with the double prisms can change the direction of a light path, effectively reduce the transverse length of the lens and meet the light and thin requirements of a mobile phone. And this utility model camera lens also can realize the requirement of full face screen with the help of camera elevating gear, for this reason, it is especially necessary to develop a biprism periscope formula cell-phone camera lens.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a biprism periscope formula cell-phone camera lens.

The utility model adopts the technical proposal that:

a first lens L1, a first reflective optical element, an aperture stop S, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a second reflective optical element are sequentially arranged from an object side to an image side. The first, second, third, fourth, fifth are plastics aspheric surface lens, and first, second reflection optical element is the prism that plane of reflection and optical axis contained angle are 45 degrees: the first lens element L1 has negative refractive power, and the first surface has a point of inflection; the first reflecting element bends the light path, and the included angle between the reflecting surface and the optical axis is 45 degrees; the second lens element L2 has a biconvex lens with negative refractive power; the third lens element L3 has positive refractive power, and the first surface has a point of inflection; the fourth lens element L4 has a biconvex lens with negative refractive power; the fifth lens element L5 has positive refractive power, and the first surface has a point of inflection; the second reflecting element bends the light path, and the reflecting surface and the optical axis form an included angle of 45 degrees.

The utility model has the advantages that:

the utility model provides a biprism periscope formula cell-phone camera lens, the lens simple structure of this camera lens adopts two prisms to change the trend of light path, has effectively reduced the horizontal length of lens group, has realized the breakthrough of ultra-thin technique, uses 5 lens structures to obtain higher optical property, keeps higher definition.

Drawings

Fig. 1 is a two-dimensional diagram of the lens of the present invention.

Detailed Description

A double-prism periscopic mobile phone lens is provided with a first lens L from an object space to an image space in sequence₁A first reflective optical element, an aperture stop S, a second mirror L₂A third lens L₃The fourth lens L₄The fifth lens L₅And a second reflective optical element. The first, second, third, fourth, fifth are plastics aspheric surface lens, and first, second reflection optical element is the prism that plane of reflection and optical axis contained angle are 45 degrees:

first lens L₁Has negative refractive power, and a reverse curve point is arranged on the first surface;

the first reflecting element bends the light path, and the included angle between the reflecting surface and the optical axis is 45 degrees;

second lens L₂A biconvex lens with negative refractive power;

third lens L₃Has positive refractive power, and a reverse curve point is arranged on the first surface;

fourth lens L₄A biconvex lens with negative refractive power;

fifth lens L₅Has positive refractive power, and a reverse curve point is arranged on the first surface;

the second reflecting element bends the light path, and the reflecting surface and the optical axis form an included angle of 45 degrees.

Lens L₁Focal length f of₁And the lens focal length f satisfies the following condition:

-2<f₁/f<-1

lens L₃Focal length f of₃And the lens focal length f satisfies the following condition:

2<f₃/f<5

lens L₅Focal length f of₅And the lens focal length f satisfies the following condition:

1<f₅/f<3

lens L₁Radius of curvature r of₁And r₂The following conditions are satisfied:

-3.5<(r₁-r₂)/(r₁+r₂)<-2

lens L₄Radius of curvature r of₇And r₈The following conditions are satisfied:

-1.5<(r₇-r₈)/(r₇+r₈)<-1

lens L₅The plastic material with high refractive index is adopted, and the following conditions are met:

1.55<n₅<1.66；

f₁is L₁The focal length of the lens;

f₃is L₃The focal length of the lens;

f₅is L₅The focal length of the lens;

f is the focal length of the double-prism periscopic mobile phone lens;

r₁is L₁The curvature radius of the concave image surface of the lens;

r₂is L₁The radius of curvature of the concave object plane of the lens;

r₇is L₄The radius of curvature of the lens convex to the first prism;

r₈is L₄The radius of curvature of the lens convex to the second prism;

n₅is L₅D-line refractive index of the lens.

In order to reduce the length requirement, this use novel camera lens to adopt biprism to change the light path trend, in order to obtain high definition, this use novel camera lens adopts 5 aspheric surface plastic lenses to obtain higher definition, optimization aberration that can be fine reduces the influence of aberration. Resulting in better image resolution. The main method is to adopt an even aspheric surface, so that the shape of the lens can be effectively controlled, and the aberration of each position on an image plane in the optical system is reduced. The utility model discloses a 5 plastic lenses are the even aspheric surface, and each aspheric surface coefficient satisfies following equation:

Z＝cy²/[1+{1－(1+k)c²y²}^+1/2]+A₄y⁴+A₆y⁶+A₈y⁸

+A₁₀y¹⁰+A₁₂y¹²+A₁₄y¹⁴+A₁₆y¹⁶

wherein,

z: the vector height of the non-spherical surface,

c: the curvature of the aspheric surface in the paraxial region,

y: the aperture of the lens is measured by the lens,

k: the coefficient of the cone is the coefficient of the cone,

A₄: the 4-order aspherical surface coefficient is determined,

A₆: the coefficient of the aspherical surface at the degree of 6,

A₈: the coefficient of the aspherical surface at the degree of 8,

A₁₀: the coefficient of the aspherical surface is given by 10 times,

A₁₂: the coefficient of the aspherical surface at the order of 12,

A₁₄: the aspherical surface coefficient of the order of 14,

A₁₆: aspheric coefficients of 16 th order.

Please refer to table one, which implements the design parameters of the dual-prism periscopic mobile phone lens:

number of noodles	A₄	A₆	A₈	A₁₀	A₁₂	A₁₄	A₁₆
								1	0.063699	-0.01417	0.002572	-0.00027	1.24E-05	0	0
2	0.064451	-0.00034	-0.00412	0.001855	-0.0002	0	0
								3	0	0	0	0	0	0	0
4	0	0	0	0	0	0	0
								5	0	0	0	0	0	0	0
6	0	0	0	0	0	0	0
								7	0.002077	0.000415	-0.00035	0.000601	-0.00013	0	0
8	0.060215	-0.05438	0.029485	-0.00899	0.001016	0	0
								9	0.122587	-0.07454	0.036564	-0.01404	0.002106	0	0
10	0.126415	-0.08115	0.01489	-0.00977	-0.00162	0	0
								11	0.123246	-0.04736	0.008388	-0.00256	0.000843	0	0
12	0.039736	-0.02034	0.004923	0.001401	-0.00035	0	0
								13	0.246892	-0.24703	0.145353	-0.03735	0.002982	0	0
14	0.214376	-0.2407	0.163711	-0.05575	0.007908	0	0
								15	0	0	0	0	0	0	0
16	0	0	0	0	0	0	0
								17	0	0	0	0	0	0	0
18	0	0	0	0	0	0	0

Watch 1

In the present embodiment, the first and second electrodes are,

the first lens focal length is-5.426;

the focal length of the second lens is-3.988;

the third lens focal length is 6.846;

the focal length of the fourth lens is-3.444;

the focal length of the fifth lens is 5.125;

the attached drawing is the two-dimensional drawing of the lens of the utility model.

Claims

1. A double-prism periscopic mobile phone lens is characterized in that a first lens L is sequentially arranged from an object space to an image space₁A first reflective optical element, an aperture stop S, a second mirror L₂A third lens L₃The fourth lens L₄The fifth lens L₅And a second reflective optical element;

the first, second, third, fourth and fifth are plastic aspheric lenses, and the first and second reflective optical elements are prisms with a reflecting surface and an optical axis included angle of 45 degrees.

2. The lens of claim 1, wherein the first lens L is a first lens₁Has negative refractive power, and a point of inflection exists on the first surface.

3. The twin prism periscopic phone lens according to claim 1, wherein the first reflecting element bends the light path with the reflecting surface at an angle of 45 ° to the optical axis.

4. The lens of claim 1, wherein the second lens L is a lens with a double-prism periscope₂A biconvex lens with negative refractive power.

5. The lens of claim 1, wherein the third lens L is a lens with a double-prism periscope₃Has positive refractive power and a point of inflection on the first surface.

6. The lens of claim 1, wherein the fourth lens L is a lens with a double-prism periscope₄A biconvex lens with negative refractive power.

7. The lens of claim 1, wherein the fifth lens L is a lens₅Has positive refractive power and a point of inflection on the first surface.

8. The twin prism periscopic phone lens according to claim 1, wherein the second reflecting element bends the light path with the reflecting surface at an angle of 45 ° to the optical axis.