Photoelectric tube

Patent metadata

Field	Value
Publication number	US-11894223-B2
Application number	US-202118026368-A
Country	US
Kind code	B2
Filing date	Sep 3, 2021
Priority date	Oct 6, 2020
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A photoelectric tube includes a housing including a light transmitting portion, an electron emitting portion held by a recess provided in the housing, the electron emitting portion including a concave photoelectric surface facing a light transmitting portion side inside the housing, and an electron capturing portion disposed between the light transmitting portion and the photoelectric surface inside the housing. At least a part of the electron capturing portion is located inside a region on an inside of the photoelectric surface.

First claim

The invention claimed is:

1. A photoelectric tube comprising:
a housing including a light transmitting portion;
an electron emitting portion held by a recess provided in the housing, the electron emitting portion including a concave photoelectric surface facing the light transmitting portion side inside the housing; and
an electron capturing portion disposed between the light transmitting portion and the photoelectric surface inside the housing,
wherein at least a part of the electron capturing portion is located inside a region on an inside of the photoelectric surface.

2. The photoelectric tube according to claim 1 , wherein:
the photoelectric surface includes a bottom surface and a side surface; and
the side surface is curved such that an inclination increases as a distance from the bottom surface increases.

3. The photoelectric tube according to claim 1 , wherein the photoelectric surface has a circular shape when viewed from the light transmitting portion side.

4. The photoelectric tube according to claim 1 , wherein the electron capturing portion is a plate-shaped member, and is disposed to divide a region inside the housing when viewed from the light transmitting portion side.

5. The photoelectric tube according to claim 1 , wherein:
the housing further includes a main body having the recess;
the light transmitting portion is attached to the main body to close an opening of the recess; and
the electron emitting portion and the electron capturing portion are supported by the main body.

6. The photoelectric tube according to claim 5 , wherein:
the electron emitting portion is disposed on an inner surface of the recess; and
the electron capturing portion bridges over an opening edge of the recess.

7. The photoelectric tube according to claim 5 , further comprising a conductive portion electrically connected to the electron capturing portion,
wherein a part of the conductive portion and a part of the electron emitting portion are exposed to an outside on a surface of the main body on an opposite side from the light transmitting portion.

8. The photoelectric tube according to claim 1 , further comprising a conductive layer disposed along the light transmitting portion to face the photoelectric surface inside the housing and configured to allow light to pass therethrough.

Assignees

• Hamamatsu Photonics Kk

Inventors

• Kodama Tsuyoshi
• Yamada Masaki
• Hara Shinichi
• UMEBAYASHI Naoki

Classifications

• H01J47/02 Primary

  Ionisation chambers · CPC title

• H01J40/04 Primary

  Electrodes · CPC title

• H01J40/06

  Photo-emissive cathodes · CPC title

• H01J40/16

  having photo- emissive cathode, e.g. alkaline photoelectric cell (operating with secondary emission H01J43/00) · CPC title