JP2013210543A5

JP2013210543A5 -

Info

Publication number: JP2013210543A5
Application number: JP2012081584A
Authority: JP
Filing date: 2012-03-30
Publication date: 2015-05-14
Anticipated expiration: 2032-03-30

Description

本発明の一側面としての撮像装置は、複数のレンズを有する撮像光学系と、該撮像光学系の像面近傍に、物体側に凹面を向けて湾曲した撮像面と、を有する撮像装置であって、
前記撮像光学系は少なくとも２枚のレンズを有し、該２枚のレンズの間を流体媒質で満たし、該流体媒質中に開口絞りが配置されており、
前記開口絞りよりも前記物体側にあって前記流体媒質と接したレンズ面の形状を凹面とし、前記開口絞りよりも像側にあって前記流体媒質と接したレンズ面の形状を凸面として構成され、
次の（１）式及び（２）式を満足させるように構成することができる。
０．８≦ｆ＿ｓｙｓ／ｄ＿ｐｕｐ≦１．５ …（１）
０．８≦｜Ｒ＿ｉｍｇ｜／ｆ＿ｓｙｓ≦１．５ …（２）
但し、ｆ＿ｓｙｓは前記撮像光学系の焦点距離、ｄ＿ｐｕｐは前記撮像光学系の射出瞳から前記撮像面までの距離、Ｒ＿ｉｍｇは前記撮像面の曲率半径である。 Imaging apparatus according to one aspect of the present invention, there in an imaging apparatus having an imaging optical system having a plurality of lenses, near the image plane of the imaging optical system, and a capturing surface curved towards the concave surface on the object side And
The imaging optical system has at least two lenses, meet between the two lenses in the fluid medium, the aperture stop is disposed in a fluid medium,
The shape of the lens surface in contact with the fluid medium be in the object side than the aperture stop and concave, is configured to the shape of the lens surface in contact with the fluid medium be in the image side of the aperture stop as convex ,
It can comprise so that the following (1) Formula and (2) Formula may be satisfied.
0.8 ≦ f_sys / d_pup ≦ 1.5 (1)
0.8 ≦ | R_img | /f_sys≦1.5 (2)
Where f_sys is the focal length of the imaging optical system, d_upup is the distance from the exit pupil of the imaging optical system to the imaging surface, and R_img is the radius of curvature of the imaging surface.

Claims

An imaging optical system having a plurality of lenses, near the image plane of the imaging optical system, an imaging apparatus having an imaging surface curved towards the concave surface on the object side,
The imaging optical system has at least two lenses, meet between the two lenses in the fluid medium, the aperture stop is disposed in a fluid medium,
The shape of the lens surface in contact with the fluid medium be in the object side than the aperture stop and concave, is configured to the shape of the lens surface in contact with the fluid medium be in the image side of the aperture stop as convex ,
When the focal length of the imaging optical system is f_sys, the distance from the exit pupil of the imaging optical system to the imaging surface is d_upp, and the radius of curvature of the imaging surface is R_img, the following equations (1) and (2) An imaging apparatus characterized by satisfying the formula .
0.8 ≦ f_sys / d_pup ≦ 1.5 (1)
0.8 ≦ | R_img | /f_sys≦1.5 (2)

The imaging apparatus according to claim 1 , wherein a relationship between a radius of curvature R_img of the imaging surface and a distance d_pup from an exit pupil of the imaging optical system to the imaging surface satisfies the following expression.
0.8 ≦ | R_img | /d_pup≦1.5

The radius of curvature of the lens surface in contact with the fluid medium be in the object side than the aperture stop, according to claim 1 or 2, characterized in that larger than the distance to the aperture diaphragm from the lens surface Imaging device.

Than the radius of curvature of the lens surface in contact with the fluid medium be in the object side than the aperture stop, it has a small radius of curvature of the lens surface in contact with the fluid medium be in the image side than the aperture stop The imaging apparatus according to claim 1 or 2 , wherein

Φf the power of the lens surface in contact with the fluid medium be in the object side than the aperture stop,
When the power of the lens surface in contact with the fluid medium be in the image side than the aperture stop and [phi] r, according to claims 1, characterized in that to satisfy the following expression in any one of 4 Imaging device.

Said opening a distance from the aperture stop to the lens surface in contact with the fluid medium be in the image side than the aperture stop, the lens surface in contact with the fluid medium be in the object side than the aperture stop the imaging apparatus according to any one of claims 1, characterized in that the set to be shorter than the distance to the stop 5.

Claim 1, wherein the lens surface in contact with the fluid medium in a on the object side of the aperture stop, wherein the perimeter of the lens surface is an aspherical shape displaced on the image side from the reference spherical surface The imaging device according to any one of 1 to 6 .

Claim 1, wherein the aperture stop there to the image side than the lens surface in contact with the fluid medium, characterized in that an aspherical shape in which the periphery is displaced from the reference spherical surface on the object side of the lens surface The imaging device according to any one of 1 to 6 .

The fluid medium, the imaging apparatus according to any one of claims 1 to 8, which is a liquid.