# US 11,029,375 B2 · Cell module for optically pumped magnetic sensor

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- Number: US 11,029,375 B2
- Document ID: US11029375B2
- Status: Granted
- Kind: B2
- Application number: 16/589,370
- Filed: 2019-10-01
- Published: 2020-04-09
- Granted: 2021-06-08
- Earliest claimed: 2018-10-05
- Assignees: Hamamatsu Photonics K.K.
- Applicants: Hamamatsu Photonics K.K.
- Inventors: Norihisa Kato; Motohiro Suyama
- Web page: https://patentgrep.com/patent/US11029375B2

## CPC

- G01R 33/26: using optical pumping
- G01R 33/032: using magneto-optic devices, e.g. Faraday {or Cotton-Mouton effect}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A cell module used for a photoexcitation magnetic sensor includes a cell in which an alkali metal is enclosed, a heater which is disposed close to the cell to heat the alkali metal, and a case which forms a decompression region accommodating the cell and the heater.

## Claims

### Claim 1

A cell module for an optically pumped magnetic sensor, comprising:
a cell in which an alkali metal is enclosed;
a heating unit which is disposed close to the cell to heat the alkali metal; and
an accommodation unit which forms a decompression region accommodating the cell and the heating unit.

### Claim 2 (depends on 1)

The cell module for the optically pumped magnetic sensors according to claim 1, wherein the decompression region is a vacuum region.

### Claim 3 (depends on 1)

The cell module for the optically pumped magnetic sensor according to claim 1, wherein the heating unit is thermally coupled to an outer surface of the cell and disposed so as to be separated from an inner surface of the accommodation unit.

### Claim 4 (depends on 1)

The cell module for the optically pumped magnetic sensor according to claim 1, further comprising a support portion which supports the cell in the accommodation unit so that an inner surface of the accommodation unit and an outer surface of the cell are separated from each other.

### Claim 5 (depends on 4)

The cell module for the optically pumped magnetic sensor according to claim 4, wherein the cell has a shape extending in a predetermined axial direction, includes a magnetic field incident portion at one end side in the axial direction, and is supported by the support portion at other end side in the axial direction.

### Claim 6 (depends on 1)

The cell module for the optically pumped magnetic sensor according to claim 1, further comprising a heat insulating member which is disposed between an inner surface of the accommodation unit and an outer surface of the cell.

### Claim 7 (depends on 6)

The cell module for the optically pumped magnetic sensor according to claim 6, wherein the heat insulating member is a radiation heat reflection member which reflects radiation heat from the outer surface of the cell.