JP2019056780A5

JP2019056780A5 -

Info

Publication number: JP2019056780A5
Application number: JP2017180873A
Authority: JP
Filing date: 2017-09-21
Publication date: 2020-11-12
Anticipated expiration: 2037-09-21

Description

本発明の一側面としての光学系は、径方向において光軸から離れるにしたがって透過率が減少する第１の領域を含む光学素子を有する光学系であって、前記第１の領域における透過率の変化のしかたは、入射光の波長によって異なり、前記光学素子の有効径をｒ_ａ、前記第１の領域において、透過率が最大値の０．９倍の値となる位置の径方向における前記光軸からの距離をｒ_１、透過率が最大値の０．５倍となる位置の径方向における前記光軸からの距離をｒ_２、透過率が最大値の０．１倍となる位置の径方向における前記光軸からの距離をｒ_３とするとき、波長６５０ｎｍ、波長５５０ｎｍ、及び波長４５０ｎｍの夫々に対して所定の条件式を満たす。
Optical system according to one aspect of the present invention is an optical system having an optical element including a first region in which the transmittance decreases as the distance from the optical axis in the radial direction, prior Symbol transmitted in the first region how change rate is different depending on the wavelength of the incident light, the effective diameter r _a of the optical _element, in the first region, in the radial direction of the position where the transmittance is 0.9 times the value of the maximum value r ₁ a distance from the optical _axis, and 0.1 times the distance r _2, transparently rate maximum value from the optical axis in the radial direction of the position transparently ratio of 0.5 times the maximum value when the distance from the optical axis in the radial direction of the position where the _{r 3,} satisfies a predetermined condition for each of the wavelength 650 nm, the wavelength 550 nm, and the wavelength 450nm.

Claims

An optical system having an optical element including a first region in which the transmittance decreases as the distance from the optical axis in the radial direction,
How change in transmittance before Symbol first region is different depending on the wavelength of the incident light,
Effective diameter r _a of the optical _element, in the first region, the distance from the optical axis in the radial direction of the position where the transmittance is 0.9 times the value of the maximum value r _1, transparently rate the distance from the optical axis in the radial direction of 0.5 times and a position of maximum value r _2, the distance from the optical axis in the radial direction of the position transparently rate is 0.1 times the maximum value r ₃ to time, wavelength 650 nm, the wavelength 550 nm, and 0.6 ≦ _{_r} 2 / _r _a ≦ for each of the wavelength 450 nm 0.9
_{_{0.1 ≦ (r 3 -r 1)}} / r a
An optical system characterized by satisfying the conditional expression.

Before SL optics, wherein the closer to the optical axis than the first region, and the wavelength 650 nm, the wavelength 550 nm, and the transmittance for each wavelength 450nm is characterized in that it comprises a second region is constant Item 1. The optical system according to item 1.

The first wavelength in the region 650 nm, wavelength 550 nm, and transmittance with respect to each of the wavelength 450nm is in claim 1 or 2, characterized in that decrease discontinuously according to said optical axis or we are away in the radial direction The optical system described.

In the first region, 0 the maximum transmittance to _{r 2R,} wavelength 550nm to distance from the optical axis in 0.5 times the value become the radial position of the transmission is maximum for wavelength 650nm distance r _2G from the optical axis in the radial direction of the position at which .5 times the value, the transmittance against wavelength 450nm is from the optical axis in the radial position of 0.5 times the value of the maximum value When the distance is r _2B ,
_{_{_{r 2G / r a <r 2R}}} / r a
_{_{_{r 2G / r a <r 2B}}} / r a
The optical system according to any one of claims 1 to 3, wherein the optical system satisfies any one of the conditional expressions.

When the focal length of the optical system is f and the open F value is Fno when focused at infinity,
8 mm ≤ f / Fno ≤ 70 mm
The optical system according to any one of claims 1 to 4, wherein the optical system satisfies the conditional expression.

When the focal length of the optical system is f and the open F value is Fno when focused at infinity,
10 mm ≤ f / Fno ≤ 65 mm
The optical system according to any one of claims 1 to 5, wherein the optical system satisfies the conditional expression.

When the half angle of view of the optical system is ω,
9 ° ≤ ω ≤ 45 °
The optical system according to any one of claims 1 to 6, wherein the optical system satisfies the conditional expression.

The optical system according to any one of claims 1 to 7, wherein the optical element is arranged at the same position as the diaphragm in the optical axis direction .

The optical system according to any one of claims 1 to 7, wherein the optical element is arranged at a position different from that of the diaphragm in the optical axis direction .

An image pickup apparatus comprising the optical system according to any one of claims 1 to 9 and a light receiving element that receives light from the optical system.