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Lens module

A lens module and lens technology, applied in installation, optics, instruments, etc., can solve problems such as strange light and shadow, high reflectivity, and abnormal images

Inactive Publication Date: 2013-03-20
SCIENBIZIP CONSULTINGSHENZHENCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And this part of the reflected light forms stray light after multiple reflections in the lens barrel, resulting in strange light and shadow in the imaged image
[0003] The traditional lens module has a high reflectivity for long waves with a wavelength of 700nm~740nm. When the lens module and the light source form an angle of 35 degrees to shoot, half-moon-shaped stray light will be generated at the corner of the image, resulting in abnormal images.

Method used

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Embodiment Construction

[0013] like figure 1 As shown, it is a lens module 100 provided by the embodiment of the present invention, which includes a lens barrel 10 and a first lens 20, a second lens 30, and a third lens accommodated in the lens barrel 10 40 . Two shading sheets 50 and a filter sheet 60 .

[0014] The lens barrel 10 is cylindrical and includes a half-closed object side 11 , an unclosed image side 12 and an accommodating space 13 communicating with both the object side 11 and the image side 12 . The first lens 20 , the second lens 30 and the third lens 40 are sequentially accommodated in the accommodating space 13 from the object side 11 to the image side 12 .

[0015] The first lens 20 includes a first object end surface 21 and a first image end surface 22 opposite to the first object end surface 21 . The first object end surface 21 protrudes toward the object side 11 , and the first image end surface 22 is concave toward the image side 12 . The second lens 30 includes a second obj...

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Abstract

The invention provides a lens module which comprises a lens barrel, a first lens, a second lens and a third lens. The first lens, the second lens and the third lens are accommodated in the lens barrel. The lens barrel comprises an object side and an image side which is opposite to the object side. The first lens, the second lens and the third lens are arranged in sequence from the object side to the image side. The second lens comprises a second object end surface arranged towards the object side and a second image end surface arranged towards to the image side. A layer of anti-reflection film is plated on the second image end surface. The reflectivity of the anti-reflection film to light rays with the wavelength of 700-740 nanometers is less than 2.25%. Due to the fact that the anti-reflection film with the wavelength of 700-740 nanometers and the reflectivity less than 2.25% is plated on the second image end surface of the second lens, generation of half-moon-shaped stray light ways is effectively reduced.

Description

technical field [0001] The invention relates to a lens module, in particular to a lens module capable of reducing half-moon stray light. Background technique [0002] The lens module includes a lens barrel and at least one lens accommodated in the lens barrel. When the light enters the lens barrel from the object side of the lens barrel, most of the light will directly pass through the lens sheet, and a small part of the light will be absorbed by the lens. reflected by the optical surface. And this part of the reflected light forms stray light after multiple reflections in the lens barrel, resulting in strange light and shadow in the imaged image. [0003] Traditional lens modules have a high reflectivity for long waves with a wavelength of 700nm~740nm. When the lens module and the light source form an angle of 35 degrees to shoot, a half-moon-shaped stray light will be generated at the corner of the image, resulting in abnormal images. Contents of the invention [0004]...

Claims

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Application Information

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IPC IPC(8): G02B7/02G02B1/11G02B7/00
Inventor 林宗瑜
Owner SCIENBIZIP CONSULTINGSHENZHENCO