Optical element and imaging apparatus

Patent metadata

Field	Value
Publication number	US-9778401-B2
Application number	US-201514659811-A
Country	US
Kind code	B2
Filing date	Mar 17, 2015
Priority date	Mar 26, 2014
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An optical element in which light with a large principal ray input angle is gradually input from a center to a peripheral portion, a thickness gradually increases from the center to the peripheral portion, and 1<RD≦1.085 is satisfied, when an increase ratio of a thickness to the center at an outermost peripheral portion to which light of which the principal ray input angle is maximum is input is set to RD.

First claim

What is claimed is:

1. An optical element, comprising:
wherein light with a large principal ray input angle is gradually input from a center to a peripheral portion,
wherein a thickness gradually increases from the center to the peripheral portion, and
wherein 1<RD≦1.085 is satisfied, when an increase ratio of a thickness to the center at an outermost peripheral portion to which light of which the principal ray input angle is maximum is input is set to RD.

2. The optical element according to claim 1 ,
wherein 1<RD≦1.045 is satisfied.

3. The optical element according to claim 1 , further comprising:
a dielectric multilayer film,
wherein a thickness of the dielectric multilayer film becomes gradually large from a center to a peripheral portion.

4. The optical element according to claim 3 ,
wherein the dielectric multilayer film is formed by alternately laminating a high refractive index material and a low refractive index material.

5. The optical element according to claim 4 ,
wherein the dielectric multilayer film is formed by alternately laminating a TiO 2 layer and a SiO 2 layer.

6. The optical element according to claim 3 ,
wherein a number of total layers of the dielectric multilayer film is set to 70 or less.

7. The optical element according to claim 6 ,
wherein the number of total layers is set to 40 to 60.

8. The optical element according to claim 1 ,
wherein a transmittance with respect to a wavelength range of 450 nm to 650 nm at a center portion is set to be larger than 90%.

9. An imaging apparatus, comprising:
an imaging element; and
an optical element in which light with a large principal ray input angle is gradually input from a center to a peripheral portion,
wherein a thickness of the optical element gradually increases from the center to the peripheral portion, and
wherein, in the optical element, 1<RD≦1.085 is satisfied, when an increase ratio of a thickness to the center at an outermost peripheral portion to which light of which the principal ray input angle is maximum is input is set to RD.

Assignees

• Sony Corp

Inventors

• Kuriyama Akito
• Konishiike Isamu
• Yagi Kazumasa
• Ootsu Keisuke
• Nakatsuji Tatsuya
• Tsuji Takumi
• Nakanishi Hitoshi
• Ando Masaki

Classifications

• G02B5/208 Primary

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• H01L27/14625

  Electricity · mapped topic

• H10F39/806

  Optical elements or arrangements associated with the image sensors · CPC title