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wide-angle imaging lens

An imaging lens and lens technology, applied in optical components, instruments, optics, etc., can solve the problems of complex structure, inconvenient carrying, and long overall length, and achieve the effects of light volume, easy splicing, and short overall length

Active Publication Date: 2019-03-01
BEIJING NEDPLUSAR DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a wide-angle lens system only has a total viewing angle of about 120 degrees, and such a range of viewing angles is obviously not capable of photographing a wide-angle range
[0003] On the other hand, Japanese Patent Application Publication No. 2004-102162 discloses a wide-angle lens system, which can provide a total viewing angle of about 170 degrees to the shooting area. This wide-angle lens system is composed of up to eight lens elements with relative Complicated structure and long overall length, the cost is significantly increased and there is a lot of inconvenience in carrying

Method used

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Examples

Experimental program
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no. 1 example

[0035] Such as figure 1 As shown, a wide-angle imaging lens according to the first embodiment of the present invention is arranged in order from the object side to the image forming side along the light incident direction. The first lens group is located on the first lens Group the light refraction element P behind the optical path, the diaphragm S, and the second lens group and the optical imaging device behind the diaphragm; wherein the refractive index of the material constituting the light refraction element P is greater than the refractive index of the surrounding medium (such as air);

[0036] As a feature of the present invention, the geometric center point O of the light refraction element P arranged between the first and second lens groups is located on the optical axis, and the optical axis distance from the object side vertex of the first lens group to point O For l front , The optical axis distance from the geometric center point O to the imaging surface of the imagin...

no. 2 example

[0058] As another embodiment of the present invention, there is a difference in the type of the light refraction element P from the first embodiment and its modification. Such as Picture 9 As shown, in the wide-angle imaging lens according to the second embodiment of the present invention, the light refraction element P is a spherical lens, and the spherical center point O is located on the optical axis, and consistent with the first embodiment, from the object side of the first lens group The optical axis distance from vertex to point O is l front , The optical axis distance from the geometric center point O to the imaging surface of the imaging device is l rear : L front With l rear And satisfaction And further preferably satisfy:|l front -l rear |≤2mm.

[0059] When the light refraction element P is like Picture 9 In the form of the ball lens shown, its two planes form a spherical surface and have a fixed refractive power. At this time, the first lens group includes not o...

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Abstract

The invention relates to a small-sized wide-angle lens which is capable of realizing high-quality imaging in a large field of view. An image of the edge of field of view matches an image of the edge of field of view of another wide-angle lens. Panoramic image synthesis is completed through image processing. The wide-angle imaging lens can be used as a single wide-angle lens, and is suitable for a panoramic image forming device composed of a number of wide-angle lenses.

Description

Technical field [0001] The present invention relates to a small wide-angle imaging lens, in particular, to a low-cost, small-sized wide-angle lens system suitable for solid-state image sensors. The wide-angle lens system is suitable for digital images such as TV phones, panoramic cameras, virtual reality shooting devices, etc. Camera equipment with good optical performance. Background technique [0002] People have generally known wide-angle lens systems for solid-state image sensors. For example, Japanese Patent Application Publication No. H6-34879 and Japanese Patent Application Publication No. 2001-337268 disclose a wide-angle lens system with a three-lens structure. However, such a wide-angle lens system only has a total angle of view of about 120 degrees, and such a range of angle of view is obviously not up to the wide-angle range of the camera. [0003] On the other hand, Japanese Patent Application Publication No. 2004-102162 discloses a wide-angle lens system that can pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/06G02B13/00
CPCG02B13/0015G02B13/06
Inventor 程德文
Owner BEIJING NEDPLUSAR DISPLAY TECH CO LTD