CN110596867A

CN110596867A - Adaptive lens for ultra-wide-angle lens of mobile phone

Info

Publication number: CN110596867A
Application number: CN201910990880.4A
Authority: CN
Inventors: 王晓红; 张志美; 吴建军; 李瑶
Original assignee: Shenyang Normal University
Current assignee: Shenyang Normal University
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2019-12-20
Anticipated expiration: 2039-10-18
Also published as: CN110596867B

Abstract

The invention discloses an adaptive lens for a super-wide-angle lens of a mobile phone, which sequentially comprises a first lens and a second lens from an object space, wherein the first lens is a negative meniscus spherical lens and comprises a first convex spherical surface and a second concave spherical surface, the second lens is a positive meniscus spherical lens and comprises a third convex spherical surface and a fourth concave spherical surface, and the first lens and the second lens are made of glass materials. After the ultra-wide-angle lens of the mobile phone is attached to the ultra-wide-angle lens of the mobile phone by the adaptive lens, the field angle of the lens of the mobile phone can be increased, so that the lens is more suitable for shooting various sports, landscapes and real photographic works.

Description

Adaptive lens for ultra-wide-angle lens of mobile phone

Technical Field

The invention provides an adaptive lens for a super wide-angle lens of a mobile phone, and particularly relates to a super wide-angle lens with an equivalent focal length F of 9mm and a relative aperture F of 2.4.

Background

The mobile phone is taken as a communication tool carried by modern people and also becomes the most convenient shooting tool, so that people can observe and record the drips in life by a more gentle, more exquisite and more simple mind. With the increasing maturity of camera phone technology and the declining price, mobile phone photography is increasingly popular. How to take good photos and good works with a mobile phone is a problem that many photo fans and the general public need to understand urgently.

In recent years, the photographing function of mobile phones is gradually improved, and most mobile phones are provided with ultra-wide-angle lenses, so that the visual angle can reach 120 degrees, and most photographing requirements are met. However, the view angle of the ultra-wide angle lens of the mobile phone is still to be improved compared to a motion camera with a larger view angle (the view angle can reach 150 degrees).

Therefore, it is a problem to be solved urgently that people develop an adaptive lens for a super-wide angle lens of a mobile phone to enlarge the view angle of the super-wide angle lens of the mobile phone to achieve the view angle of a motion camera.

Disclosure of Invention

In view of the above, an object of the present invention is to provide an adaptive lens for a super wide-angle lens of a mobile phone, so as to solve the problem that the viewing angle of the super wide-angle lens of the existing mobile phone cannot reach the viewing angle of a motion camera.

The technical scheme provided by the invention is as follows: the first lens is a negative meniscus spherical lens and comprises a first convex spherical surface and a second concave spherical surface, the second lens is a positive meniscus spherical surface and comprises a third convex spherical surface and a fourth concave spherical surface, and the first lens and the second lens are made of glass materials.

Preferably, the refractive index of the first lens is more than 1.7 and less than 1.8, and the dispersion is more than 40 and less than 55; the second lens has a refractive index greater than 1.65 and less than 1.75 and a dispersion greater than 30 and less than 50.

Further preferably, the material of the first lens is H-LAF50B CDGM, the refractive index is 1.773, and the dispersion is 49.6; the material of the second lens is H-ZF2CDGM, the refractive index is 1.673, and the dispersion is 32.2.

Further preferably, the parameters of the adapted lens are as follows:

the adaptive lens for the ultra-wide-angle lens of the mobile phone provided by the invention has a simple structure and small volume, can be used as an additional lens and is attached to the ultra-wide-angle lens of the mobile phone, so that the effect of a moving camera is achieved, and the application of the mobile phone camera is greatly expanded; the adaptive lens for the ultra-wide-angle lens of the mobile phone adopts the compact design of the high-refraction lanthanide optical glass, simplifies the structure of the adaptive lens, improves the performance parameters of a single lens and the yield of the whole lens due to the fact that all lenses of the adaptive lens are made of glass materials, and is convenient for practical production.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

fig. 1 is a schematic structural diagram of an adaptive lens for a super-wide-angle lens of a mobile phone according to the present invention;

FIG. 2 is an MTF diagram of an adaptive lens for a super wide-angle lens of a mobile phone according to the present invention;

FIG. 3 is a field curvature diagram of an adaptive lens for an ultra-wide angle lens of a mobile phone according to the present invention;

FIG. 4 is an optical distortion diagram of an adaptive lens for a super-wide angle lens of a mobile phone according to the present invention;

fig. 5 is a relative illumination diagram of the adaptive lens for a super-wide angle lens of a mobile phone according to the present invention.

Detailed Description

The invention will be further explained with reference to specific embodiments, without limiting the invention.

As shown in fig. 1, the present invention provides an adaptive lens for a super-wide angle lens of a mobile phone, which sequentially includes a first lens 1 and a second lens 2 from an object side, wherein the first lens 1 is a negative meniscus lens including a first convex spherical surface and a second concave spherical surface, the second lens 2 is a positive meniscus lens including a third convex spherical surface and a fourth concave spherical surface, and the first lens 1 and the second lens 2 are made of glass materials.

The equivalent focal length F of the adaptive lens for the ultra-wide-angle lens of the mobile phone is 9mm, the relative aperture F is 2.4, the full field angle of the whole optical system is 156 degrees, and the total length of the lens is 9.5 mm.

The adaptive lens for the ultra-wide-angle lens of the mobile phone has a simple structure and small volume, can be used as an additional lens and is attached to the ultra-wide-angle lens of the mobile phone, so that the effect of a moving camera is achieved, and the application of the mobile phone camera is greatly expanded; the adaptive lens for the ultra-wide-angle lens of the mobile phone adopts the compact design of the high-refraction lanthanide optical glass, simplifies the structure of the adaptive lens, improves the performance parameters of a single lens and the yield of the whole lens due to the fact that all lenses of the adaptive lens are made of glass materials, and is convenient for practical production.

As an improvement of the technical scheme, the refractive index of the first lens 1 is more than 1.7 and less than 1.8, and the dispersion is more than 40 and less than 55; the second lens has a refractive index greater than 1.65 and less than 1.75 and a dispersion greater than 30 and less than 50.

As a technical improvement, the material of the first lens 1 is H-LAF50B CDGM, the refractive index is 1.773, and the dispersion is 49.6; the material of the second lens 2 is H-ZF2CDGM, the refractive index is 1.673, and the dispersion is 32.2.

As an improvement of the technical solution, the parameters of the adaptive lens are as follows:

as shown in fig. 2, half of the diagonal line of the CMOS effective area is defined as the maximum image height, and is set as 1.0 field, and 24 fields are taken for measuring the spatial frequency of different image heights. In this embodiment, the diagonal half of the CMOS is 3.2mm, i.e., 1.0 field of view.

As shown in fig. 3 to 5, the astigmatism of the adaptive lens provided by the present invention is less than 0.025 mm. The meridian field curvature and the arc loss field curvature are more than-0.025 mm and less than 0.025 mm. The optical distortion value is less than 45%. The edge illumination is greater than 40%. The optical performance is excellent.

The embodiments of the present invention have been written in a progressive manner with emphasis placed on the differences between the various embodiments, and similar elements may be found in relation to each other.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. Cell-phone super wide-angle is adaptation camera lens for camera lens, its characterized in that: include first lens (1) and second lens (2) in proper order from the object space, wherein, first lens (1) is the negative lens of falcate sphere, including first sphere of convex surface and concave surface second sphere, and second lens (2) are the positive lens of falcate sphere, including convex surface third sphere and concave surface fourth sphere, first lens (1) and second lens (2) are glass material.

2. The adaptive lens for an ultra-wide angle lens of a mobile phone according to claim 1, wherein: the refractive index of the first lens (1) is more than 1.7 and less than 1.8, and the dispersion is more than 40 and less than 55; the second lens has a refractive index greater than 1.65 and less than 1.75 and a dispersion greater than 30 and less than 50.

3. The adaptive lens for an ultra-wide angle lens of a mobile phone according to claim 1, wherein: the material of the first lens (1) is H-LAF50B CDGM, the refractive index is 1.773, and the dispersion is 49.6; the material of the second lens (2) is H-ZF2CDGM, the refractive index is 1.673, and the chromatic dispersion is 32.2.

4. The adaptive lens for an ultra-wide angle lens of a mobile phone according to claim 1, wherein: the parameters of the adaptive lens are as follows: