Optical system for camera shooting

An optical system and relational technology, applied in the field of optical systems, can solve the problems of difficult manufacturing, insufficient system freedom, difficult glass lens bonding process, etc., and achieve the effect of reducing the size of the lens group and achieving high resolution.

Active Publication Date: 2008-03-05
LARGAN PRECISION
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] First, too many glass spherical mirror configurations lead to insufficient system freedom, making it difficult to shorten the overall length of the optical system;
[0005] Second, the glass lens bonding process is not easy, causing difficulties in manufacturing

Method used

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Examples

Experimental program
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Embodiment Construction

[0094] Please refer to FIG. 1 for the first embodiment of the present invention, and please refer to FIG. 2 for the aberration curve of the first embodiment.

[0095] The main structure of the first embodiment is: an optical system for photographing, which is composed of four lenses with refractive power, and the order from the object side to the image side is as follows:

[0096] The first lens 10 with positive refractive power has a convex front surface 11 and a concave rear surface 12;

[0097] The second lens 20 with negative refractive power has a concave front surface 21 and a concave rear surface 22;

[0098] The third lens 30 with positive refractive power has a concave front surface 31 and a convex rear surface 32;

[0099] Furthermore, it is a fourth lens 40 with positive refractive power, its front surface 41 is a convex surface, and its rear surface 42 is a concave surface;

[0100] An aperture 50 is also provided, located in front of the first lens 10, for contr...

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PUM

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Abstract

The optical system thereof comprises four lenses having refraction force. From the object side to the imaging side there are: a first lens having positive refraction force, and its front surface is a convex and its back surface is a concave, and on the first lens a aspheric surface is set up; a second lens with negative force, and its front surface curvature radius is R3 and satisfies the term of -0.02[1 / mm]< 1 / R3<0.22[1 / mm], and its back surface is a concave; a third lens having positive refraction force, and its front surface is concave, and its back surface is convex, and an aspheric surface are set on both its front and back surfaces; a fourth lens whose front surface is a convex and whose back surface is a concave; an aperture located between the object and the second lens and used for controlling the brightness of the optical system.

Description

technical field [0001] The present invention relates to an optical system, in particular to a miniaturized imaging optical system applied to a camera phone. Background technique [0002] In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses has increased day by day, and the photosensitive components of general photographic lenses are nothing more than CMOS or CCD. Due to the advancement of semiconductor process technology, the pixel area of ​​photosensitive components Shrinking, miniaturized photographic lenses are gradually developing towards the field of high-resolution images, so the requirements for image quality are also increasing. [0003] Common high-resolution mobile phone lenses mostly use a front aperture and a four-element lens group. Among them, the commonly used first lens and second lens are often bonded with two glass spherical mirrors to form a Doublet to eliminate chromatic aberration. This method has its d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B9/34G02B13/18G02B1/04
CPCG02B9/34G02B13/001
Inventor 汤相岐陈俊杉
Owner LARGAN PRECISION
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