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Viewfinder lens and viewfinder

A lens and positive lens technology, which is applied in the field of viewfinder lenses and viewfinder devices, can solve the problems of poor imaging resolution and large aberration of camera devices, and achieve the effects of reducing aberrations and improving tolerance characteristics

Inactive Publication Date: 2018-12-28
SHENZHEN DEREN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the applicant of the present invention has found in long-term research that the viewing lens occupies most of the volume of the imaging device, and to reduce the volume of the imaging device, the volume of the viewing lens is preferentially reduced, but as the volume of the viewing lens increases The smaller the size, the greater the aberration, and the poorer the imaging resolution of the camera device. How to reduce the size of the viewfinder lens while ensuring its aberration has become an increasingly concerned technical issue

Method used

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Please refer to 1, the viewfinder lens includes a first positive lens 21 , a second positive lens 23 and a negative lens 23 sequentially along the optical axis of the viewfinder lens from the object end to the image end.

[0025] The first positive lens 21 has a first refractive index, the second positive lens 23 has a second refractive index, and the negative lens 23 has a third refractive index, wherein both the first refractive index and the second refractive index are smaller than the third refractive index. The three-piece lens combination structure of "positive lens-positive lens-negative lens" and the refractive index combination of "low refractive index-low refractive index-high refractive index" of the viewfinder lens make the incident light entering the viewfinder lens first pass through the low The first positive lens 21 and the seco...

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Abstract

The invention discloses a viewfinder lens, comprising a first positive lens, a second positive lens and a negative lens sequentially along the optical axis of the viewfinder lens from the object end to the image end; the first positive lens has a first refractive index , the second positive lens has a second refractive index, and the negative lens has a third refractive index, wherein both the first refractive index and the second refractive index are smaller than the third refractive index. Through the above method, the present invention can effectively improve the tolerance tolerance of the viewfinder lens and effectively reduce aberrations.

Description

technical field [0001] The invention relates to the technical field of photography, in particular to a viewfinder lens and a viewfinder device. Background technique [0002] At present, in addition to conventional communication functions, smart phones are also integrated with camera devices to meet people's shooting needs. However, the smart phone is a portable device, and the portability is the focus of people's attention. In order to improve the portability of smart phones and make it convenient for users to carry them with them, smart phones are getting smaller and lighter, and the corresponding camera devices are also required to be smaller and lighter in size. [0003] However, the applicant of the present invention has found in long-term research that the viewing lens occupies most of the volume of the imaging device, and to reduce the volume of the imaging device, the volume of the viewing lens is preferentially reduced, but as the volume of the viewing lens increase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/18G03B13/06
Inventor 冯坤亮
Owner SHENZHEN DEREN ELECTRONICS