Wide-angle lens

A wide-angle lens, lens technology, applied in the field of wide-angle lens

Active Publication Date: 2021-10-08
CALIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing wide-angle lens can no longer meet the existing needs. Therefore, how to provide a wide-angle lens that can effectively reduce aberrations, improve optical imaging quality, and have a large viewing angle is one of the directions of painstaking research by the inventors.

Method used

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Examples

Experimental program
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Embodiment Construction

[0039] In order to illustrate the present invention more clearly, a number of embodiments are given together with the accompanying drawings in detail as follows. Please refer to figure 1 As shown, it is a wide-angle lens 10 of a first embodiment of the present invention, which includes in sequence from an object side to an image side along an optical axis Z: a ​​first lens L1, a second lens L2, a third lens Lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

[0040] The first lens L1 has a negative refractive power. Preferably, the first lens L1 is a lens made of glass material, the object-side surface S1 is convex, and the image-side surface S2 is concave.

[0041] The second lens L2 has a negative refractive power. Preferably, the second lens L2 is a lens made of glass material, and its object-side surface S3 is convex, and the image-side surface S4 is concave. In addition, the second lens L2 At least one surface may adopt an aspheric surfa...

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Abstract

A wide-angle lens is sequentially arranged along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a Seventh lens. The first lens has negative refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has positive refractive power, and the sixth lens has Negative refractive power, the seventh lens has positive refractive power. It satisfies the following conditions: 0.2<f / f7<0.5, where f is the focal length of the wide-angle lens, and f7 is the focal length of the seventh lens. Through the above design, the wide-angle characteristics of the lens can be enhanced and the image quality can be improved.

Description

technical field [0001] The present invention relates to an optical lens; in particular, it refers to a wide-angle lens. Background technique [0002] In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has increased day by day. The photosensitive component of the general optical system is nothing more than two types of photosensitive coupling device (Charge Coupled Device, CCD) or complementary metal oxide semiconductor sensor (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), and with the improvement of semiconductor process technology, making The pixel size of photosensitive components is reduced, and the optical system is gradually developing into the high-pixel field. In addition, as the temperature of the external application environment of automotive lenses changes, the requirements for lens quality for temperature also increase. Therefore, the requirements for image quality are also inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/18G02B13/00G02B13/06
CPCG02B13/0045G02B13/006G02B13/06
Inventor 曾建雄徐淑娟
Owner CALIN TECH
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