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Image pick-up lens and image pick-up device

一种成像镜头、透镜的技术，应用在望远镜、仪器、光学等方向，能够解决焦距短等问题，达到修正色差、宽视场角的效果

Active Publication Date: 2013-12-04
JIANGXI JINGCHAO OPTICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it is necessary to make the focal length short to obtain a wide angle of view, and it is difficult to obtain a long back focus and a wide angle of view at the same time

Method used

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  • Image pick-up lens and image pick-up device
  • Image pick-up lens and image pick-up device

Examples

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Embodiment Construction

[0074] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. figure 1 The structure of the imaging lens 1 according to the embodiment of the present invention is illustrated in a cross section including the optical axis Z. figure 1 The example of the structure illustrated in corresponds to the lens structure in Example 1 to be described later. exist figure 1 In , the left side is the object side, and the right side is the image side. exist figure 1 In , the on-axis ray 2 and off-axis ray 3 at the maximum field angle are also illustrated. figure 1 An example is illustrated in which parallel plate-shaped optical members PP1 and PP2 assumed to be optical path conversion prisms, filters, cover glasses, etc. are provided on the image side of the imaging lens 1 .

[0075] The imaging lens 1 has a 4-group 6-lens structure, and is composed of a first lens L1 arranged in order from the object side, a first cemente...

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Abstract

[Problem] In an image pick-up lens, to achieve both long back focus and a wide angle, and to favorably correct chromatic aberration. [Solution] An image pick-up lens comprising the following, in the following order, starting from the object side: a negative first lens (L1) having a plano-concave or meniscus shape with the concave surface facing the image side; a first cemented lens (LC1) formed by cementing a second lens (L2) and a third lens (L3) with one lens positive and the other lens negative; an opening; a positive fourth lens (L4) with a flat surface or the surface that has the larger radius of curvature absolute value facing the object side; a second cemented lens (LC2) formed by cementing a fifth lens (L5) and a sixth lens (L6) with one lens positive and the other lens negative. The image pick-up lens satisfies a conditional equation related to the ratio between the focal distance of the entire system and the back focus, and the refractive indices and the Abbe numbers of the positive and negative lenses in the first cemented lens (LC1).

Description

technical field [0001] The present invention relates to an imaging lens and an imaging device. In particular, the present invention relates to an imaging lens having a wide angle of view and a long back focus, and an imaging device including the imaging lens. Background technique [0002] Traditionally, small wide-angle imaging lenses are used in the fields of in-vehicle cameras, surveillance cameras, endoscopes, etc. In recent years, an imaging lens is generally used in combination with an imaging device that images an image formed by the imaging lens. In this case, an optical low-pass filter, an infrared cut filter, etc. are usually placed between the lens system and the imaging device. Therefore, a sufficient back focus is required. Further, in some types of endoscopes, the imaging plane of the imaging device is set parallel to the direction of the long axis of the insertion unit of the endoscope. In this type of endoscope, an optical path conversion member, such as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/04G02B23/26
CPCG02B13/04G02B13/06G02B23/243G02B9/34
Inventor 宫野俊
Owner JIANGXI JINGCHAO OPTICAL CO LTD
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