CN110596867A - Adaptive lens for super wide-angle lens of mobile phone - Google Patents

Abstract

The invention discloses an adapter lens for a super wide-angle lens of a mobile phone, which sequentially includes a first lens and a second lens from the object side, wherein the first lens is a meniscus negative lens, including a convex first spherical surface and a concave second spherical surface, The second lens is a meniscus positive lens, including a convex third spherical surface and a concave fourth spherical surface, and the first lens and the second lens are made of glass. After the adapter lens for the super wide-angle lens of the mobile phone is attached to the ultra-wide-angle lens of the mobile phone, the field of view of the mobile phone lens can be increased, making it more suitable for shooting various sports, landscapes, and documentary photography works.

Description

Adaptive lens for super wide-angle lens of mobile phone

technical field

The invention provides an adapter lens for an ultra-wide-angle lens of a mobile phone, in particular to an ultra-wide-angle lens with an equivalent focal length of f=9mm and a relative aperture of F=2.4.

Background technique

As a communication tool carried by modern people, mobile phones have also become the most convenient shooting tool, allowing people to observe and record every bit of life with a more peaceful, delicate and simple state of mind. As camera phone technology matures and prices drop, mobile phone photography is becoming more and more popular. How to take good photos and good works with mobile phones has become an urgent problem for many photography enthusiasts and the general public.

In recent years, the photography function of mobile phones has become more and more perfect. Most mobile phones are equipped with ultra-wide-angle lenses, and the viewing angle can reach 120 degrees, which meets most photography requirements. However, the angle of view of the ultra-wide-angle lens of the mobile phone needs to be improved compared with the action camera with a wider angle of view (the angle of view can reach 150 degrees).

Therefore, it is an urgent problem to develop a kind of adapter lens for mobile phone ultra-wide-angle lens to expand the viewing angle of mobile phone ultra-wide-angle lens to make it reach the viewing angle of a sports camera.

Contents of the invention

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

The technical solution provided by the present invention is: an adapter lens for a super wide-angle lens of a mobile phone, which includes a first lens and a second lens sequentially from the object side, wherein the first lens is a meniscus negative lens, including a convex first spherical surface and a concave second spherical surface. The spherical surface, the second lens is a meniscus positive lens, including a convex third spherical surface and a concave fourth spherical surface, and the first lens and the second lens are made of glass material.

Preferably, the refractive index of the first lens is greater than 1.7 and less than 1.8, and the dispersion is greater than 40 and less than 55; the refractive index of the second lens is greater than 1.65 and less than 1.75, and the dispersion is 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-ZF2 CDGM, the refractive index is 1.673, and the dispersion is 32.2.

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

The adapter lens for the ultra-wide-angle lens of a mobile phone provided by the invention has a simple structure and a small size, and can be used as an additional lens and attached to the ultra-wide-angle lens of a mobile phone to achieve the effect of a sports camera and greatly expand the use of the mobile phone camera; the mobile phone provided by the invention The adapter lens for ultra-wide-angle lens is compactly designed with high-refraction lanthanide optical glass, which simplifies the structure of the adapter lens. The lenses of the adapter lens are all made of glass, which improves the performance parameters of a single lens and improves the yield rate of the entire lens. Actual Production.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

Fig. 1 is the structural representation of the adapter lens of super wide-angle lens of mobile phone provided by the present invention;

Fig. 2 is the MTF diagram of the adapter lens for the super wide-angle lens of mobile phone provided by the present invention;

Fig. 3 is the field curvature diagram of the adapter lens for super wide-angle lens of mobile phone provided by the present invention;

Fig. 4 is the optical distortion figure of the adapter lens for super wide-angle lens of mobile phone provided by the present invention;

Fig. 5 is a relative illuminance diagram of an adapter lens for a super wide-angle lens of a mobile phone provided by the present invention.

Detailed ways

The present invention will be further explained below in conjunction with specific embodiments, but the present invention is not limited thereto.

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

The equivalent focal length of the adapted lens for the super wide-angle lens of the mobile phone is f=9mm, the relative aperture is F=2.4, the full field of view of the entire optical system is 156 degrees, and the total length of the lens is 9.5mm.

The adapter lens for the ultra-wide-angle lens of a mobile phone has a simple structure and a small size, and can be used as an additional lens and attached to the ultra-wide-angle lens of a mobile phone to achieve the effect of a sports camera and greatly expand the use of the mobile phone camera; the ultra-wide-angle lens for a mobile phone provided by the invention The adapter lens is compactly designed with high refraction lanthanide optical glass, which simplifies the structure of the adapter lens. The lenses of the adapter lens are all made of glass, which improves the performance parameters of a single lens, improves the yield rate of the entire lens, and is convenient for actual production.

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

As an improvement of the technical solution, 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-ZF2 CDGM, the refractive index is 1.673, and the dispersion is 32.2.

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

As shown in Figure 2, half of the diagonal line defining the effective area of the CMOS is the maximum image height, which is set to 1.0 field of view. In order to measure the spatial frequency of different image heights, 24 fields of view are taken. In this embodiment, half of the diagonal line of the CMOS is 3.2mm, that is, the field of view is 1.0.

As shown in FIGS. 3 to 5 , the astigmatism of the adapted lens provided by the present invention is less than 0.025 mm. Meridian field curvature and arc loss field curvature are greater than -0.025mm and less than 0.025mm. The optical distortion value is less than 45%. The edge illumination is greater than 40%. Excellent optical properties.

The specific embodiments of the present invention are written in a progressive manner, emphasizing the differences of each embodiment, and the similar parts can be referred to each other.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Within the scope of knowledge of those of ordinary skill in the art, various modifications can be made without departing from the gist of the present invention. kind of change.

Claims (4)

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: