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Imaging optical system and camera device

A technology of imaging optics and optical axis, which is applied in optics, optical components, instruments, etc., can solve the problem of large temperature changes in the use of vehicle-mounted camera devices, and achieve high-resolution effects

Active Publication Date: 2021-09-07
TAMRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Furthermore, the temperature of the operating environment of the vehicle-mounted imaging device varies greatly

Method used

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  • Imaging optical system and camera device
  • Imaging optical system and camera device
  • Imaging optical system and camera device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0130] 1) The composition of the optical system

[0131] figure 1 The lens configuration of the imaging optical system according to Embodiment 1 of the present invention when focusing at infinity is shown.

[0132] The imaging optical system of Embodiment 1 is sequentially configured with a front group G1, a diaphragm (aperture stop) S, and a rear group G2, and the subject image is formed on the image plane I of an imaging element such as a CCD sensor or a CMOS sensor. also, figure 1 , "IRCF" is an infrared cut filter. These are also the same in the cross-sectional views of the lenses in other embodiments, and descriptions thereof will be omitted below.

[0133] The imaging optical system is substantially composed of 6 lenses. Specifically, the front group is composed of a first lens that is a negative lens, a second lens that is a positive lens, and a third lens that is a positive lens that are arranged in this order from the subject side. Also, the rear group is compose...

Embodiment 2

[0157] 1) The composition of the optical system

[0158] Figure 4 The lens configuration of the imaging optical system according to Example 2 of the present invention when focusing at infinity is shown.

[0159] The imaging optical system of Embodiment 2 is sequentially arranged with a front group G1, a diaphragm (aperture stop) S, and a rear group G2, and the subject image is formed on the image plane I of the imaging element. The front group is composed of a first lens that is a negative lens, a second lens that is a positive lens, and a third lens that is a positive lens that are arranged in this order from the subject side. In addition, the rear group is composed of a fourth lens as a positive lens, a fifth lens as a negative lens, and a sixth lens as a positive lens arranged in order from the subject side, and the imaging optical system is substantially composed of 6 lenses.

[0160] In the above-mentioned first lens, the surface on the subject side is a convex surface...

Embodiment 3

[0174] 1) The composition of the optical system

[0175] Figure 7 The lens configuration of the imaging optical system according to Embodiment 3 of the present invention when focusing at infinity is shown.

[0176] The imaging optical system of Embodiment 3 is sequentially arranged with a front group G1, a diaphragm (aperture stop) S, and a rear group G2, and the subject image is formed on the image plane I of the imaging element. The front group is composed of a first lens that is a negative lens, a second lens that is a positive lens, and a third lens that is a positive lens that are arranged in this order from the subject side. In addition, the rear group is composed of a fourth lens as a positive lens, a fifth lens as a negative lens, and a sixth lens as a positive lens arranged in order from the subject side, and the imaging optical system is substantially composed of 6 lenses.

[0177] In the above-mentioned first lens, the surface on the subject side is a convex surf...

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Abstract

An object of the present invention is to provide a wide-angle, compact imaging optical system and an imaging device capable of maintaining high resolution regardless of changes in ambient temperature. In order to achieve the above object, the imaging optical system of the present invention is arranged sequentially from the subject side with a front group, a diaphragm, and a rear group. The front group has a first lens arranged closest to the subject side. The first lens is a negative lens, the second lens is a concave surface on the subject side, and a convex surface on the image surface side. positive lens, the surface of the third lens on the subject side is a concave surface, and the surface of the second lens on the image side and the surface of the third lens on the subject side have an air gap on the optical axis , the two lenses are arranged adjacently in contact with each other outside the effective diameter range of each lens. Furthermore, the imaging device of the present invention includes the imaging optical system.

Description

technical field [0001] The present invention relates to an imaging optical system and an imaging device, and in particular, relates to a wide-angle imaging optical system and an imaging device suitable for an imaging device using a solid-state imaging device such as a CCD or a CMOS. Background technique [0002] Conventionally, there is known a driving assistance system in which an imaging device is installed in a vehicle, and an image acquired by the imaging device is displayed on an image display device to perform various driving assistance. As such driving assistance systems, for example, there are known rear view monitors that display images of the rear of the vehicle on an image display device, and surround view monitors that display images such as looking down on the surroundings of the vehicle from above the vehicle on the image display device. Wait. And, driving recorder has also been popularized. [0003] In addition, in recent years, in order to achieve automatic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/18G02B13/06
CPCG02B13/004G02B13/0045G02B13/06
Inventor 定直高太郎帯金靖彦
Owner TAMRON