Four color separation prism

Patent metadata

Field	Value
Publication number	US-10271024-B1
Application number	US-201816230002-A
Country	US
Kind code	B1
Filing date	Dec 21, 2018
Priority date	May 19, 2016
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A four color separation prism includes a first color separation prism, a second color separation prism, a third color separation prism, and a fourth color separation prism, which respectively separate light incident from an affected area into a blue, red and green color components, and an infrared (IR) component. The first color separation prism, the second color separation prism, the third color separation prism, and the fourth color separation prism are sequentially disposed from an object side when receiving the light incident from the affected area.

First claim

The invention claimed is:

1. A four color separation prism comprising:
a first color separation prism, a second color separation prism, a third color separation prism, and a fourth color separation prism which respectively separate light incident from an affected area into a first color component, a second color component, a third color component, and a fourth color component which are any one of a blue color component, a red color component, a green color component, and an infrared (IR) component,
wherein a light emission surface of the first color separation prism is disposed opposite to a light emission surface of the second color separation prism and a light emission surface of the third color separation prism across an incident ray which is incident vertically to an object side incident surface of the first color separation prism,
wherein a first angle formed between the object side incident surface of the first color separation prism and a reflective surface of the first color separation prism is greater than a second angle formed between the object side incident surface of the first color separation prism and a reflective surface of the second color separation prism.

2. The four color separation prism of claim 1 , wherein a boundary between the first color separation prism and the second color separation prism includes the reflective surface of the first color separation prism on a first side of the boundary, and an object side incident surface of the second color separation prism on a second side of the boundary.

3. The four color separation prism of claim 1 , wherein a boundary between the second color separation prism and the third color separation prism includes the reflective surface of the second color separation prism on a first side of the boundary, and an object side incident surface of the third color separation prism on a second side of the boundary.

4. The four color separation prism of claim 1 , wherein a boundary between the third color separation prism and the fourth color separation prism includes the reflective surface of the third color separation prism on a first side of the boundary, and an object side incident surface of the fourth color separation prism on a second side of the boundary.

5. The four color separation prism of claim 2 , wherein the boundary is at an angle with respect to the object side incident surface of the first color separation prism.

6. The four color separation prism of claim 3 , wherein the boundary is at an angle with respect to the object side incident surface of the first color separation prism.

7. The four color separation prism of claim 4 , wherein the boundary is at an angle with respect to the object side incident surface of the first color separation prism.

8. The four color separation prism of claim 1 , wherein the first color separation prism is disposed to be closest to an object side among the first color separation prism, the second color separation prism, the third color separation prism and the fourth color separation prism.

9. The four color separation prism of claim 8 , wherein the first color separation prism is disposed to transmit more IR light amount than the second color separation prism, the third color separation prism or the fourth color separation prism.

10. The four color separation prism of claim 1 , wherein
the first color separation prism is configured such that the incident ray is transmitted through the object side incident surface of the first color separation prism while a portion of the transmitted incident ray hits a reflective surface of the first color separation prism and is reflected at an angle towards the object side incident surface of the first color separation prism, and
the reflected portion of the incident ray hits the object side incident surface of the first color separation prism and is reflected again at an angle towards an exit of the first color separation prism.

11. The four color separation prism of claim 1 , wherein
the second color separation prism is configured such that a portion of the incident ray is transmitted through an object side incident surface of the second color separation prism while a portion of the transmitted incident ray hits the reflective surface of the second color separation prism and is reflected at an angle towards the object side incident surface of the second color separation prism, and
the reflected portion of the incident ray hits the object side incident surface of the second color separation prism and is reflected again at an angle towards an exit of the second color separation prism.

12. The four color separation prism of claim 1 , wherein
the third color separation prism is configured such that a portion of the incident ray is transmitted through an object side incident surface of the third color separation prism while a portion of the transmitted incident ray hits the reflective surface of the third color separation prism and is reflected at an angle towards the object side incident surface of the third color separation prism, and
the reflected portion of the incident ray hits the object side incident surface of the third color separation prism and is reflected again at an angle towards an exit of the third color separation prism.

13. An optical microscope comprising:
the four color separation prism of claim 1 .

14. A four color separation prism comprising:
a first color separation prism, a second color separation prism, a third color separation prism, and a fourth color separation prism which respectively separate light incident from an affected area into a first color component, a second color component, a third color component, and a fourth color component which are any one of a blue color component, a red color component, a green color component, and an IR component,
wherein the first color separation prism, the second color separation prism, the third color separation prism, and the fourth color separation prism are sequentially disposed from an object side when receiving the light incident from the affected area,
wherein a light emission surface of the first color separation prism is disposed opposite to a light emission surface of the second color separation prism and a light emission surface of the third color separation prism across an incident ray which is incident vertically to an object side incident surface of the first color separation prism, and
wherein a first angle formed between the object side incident surface of the first color separation prism and a reflective surface of the first color separation prism is greater than a second angle formed between the object side incident surface of the first color separation prism and a reflective surface of the second color separation prism.

15. An optical microscope comprising:
the four color separation prism of claim 14 .

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Hashimoto Yota
• Katahira Haruyasu
• Takenaga Yuuichi

Classifications

• G16H30/40

  for processing medical images, e.g. editing · CPC title

• A61B1/042

  characterised by a proximal camera, e.g. a CCD camera · CPC title

• H04N25/11

  Arrangement of colour filter arrays [CFA]; Filter mosaics · CPC title

• H04N23/555

  for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes · CPC title

• H04N23/16 Primary

  Optical arrangements associated therewith, e.g. for beam-splitting or for colour correction · CPC title