# US 11,079,445 B2 · Terminal state measurement device for coaxial cable

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- Number: US 11,079,445 B2
- Document ID: US11079445B2
- Status: Granted
- Kind: B2
- Application number: 16/558,475
- Filed: 2019-09-03
- Published: 2020-03-05
- Granted: 2021-08-03
- Earliest claimed: 2018-09-04
- Assignees: Yazaki Corporation; Japan Chain Terminal Co., Ltd.
- Applicants: Yazaki Corporation; Japan Chain Terminal Co., Ltd.
- Inventors: Shingo Igarashi; Yoshihiro Ito
- Web page: https://patentgrep.com/patent/US11079445B2

## CPC

- G01R 31/69: of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances
- G01R 31/12: Testing dielectric strength or breakdown voltage {; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing (G01R31/08, G01R31/327 and G01R31/72 take precedence; measuring in plasmas G01R19/0061; measuring dielectric constants G01R27/2617; ESD, EMC or EMP testing of circuits G01R31/002)}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

A terminal state measurement device for a coaxial cable includes: a conductive cylindrical body which comes close to a front end edge of an outer conductor terminal to bring a front end face of the conductive cylindrical body into contact with the front end edge when the outer conductor terminal is connected to a coaxial cable; a conduction measurement element displaceable with respect to the conductive cylindrical body in an axial direction, and which contacts a front end of an inner conductor terminal from the front side to displace in the axial direction in accordance with an insertion position of the inner conductor terminal; a displacement measurement device which measures a position of the front end of the inner conductor terminal; and an insulation determination unit which determines an insulation quality based on a conduction state of the conduction measurement element and the conductive cylindrical body.

## Claims

### Claim 1

A terminal state measurement device for a coaxial cable comprising:
a conductive cylindrical body which comes close to a front end edge of an outer conductor terminal held and fixed in advance from a front side to bring a front end face of the conductive cylindrical body in the axial direction into contact with the front end edge when the outer conductor terminal is connected and fixed to an outer conductor of an end portion of a coaxial cable;
a conduction measurement element which is housed in an inner periphery of the conductive cylindrical body via an insulating material, which is displaceable with respect to the conductive cylindrical body in an axial direction, and which contacts a front end of an inner conductor terminal connected and fixed to an inner conductor of the end portion of the coaxial cable from the front side to displace in the axial direction in accordance with an insertion position of the inner conductor terminal when the inner conductor terminal is inserted into an inside of the outer conductor terminal from a rear side;
a displacement measurement device which is configured to measure a position of the front end of the inner conductor terminal based on a displacement amount of the conduction measurement element in the axial direction; and
an insulation determination unit which is configured to determine an insulation quality between the inner conductor terminal and the outer conductor terminal based on a conduction state of the conduction measurement element and the conductive cylindrical body.

### Claim 2 (depends on 1)

The terminal state measurement device for a coaxial cable according to claim 1,
wherein the insulation determination unit determines the insulation quality between the inner conductor terminal and the outer conductor terminal at any timing from a start of contacting of the front end of the inner conductor terminal with the conduction measurement element to an end of the contacting.

### Claim 3 (depends on 2)

The terminal state measurement device for a coaxial cable according to claim 2,
wherein the insulation determination unit determines the insulation quality between the inner conductor terminal and the outer conductor terminal at a timing when the displacement measurement device detects that the front end of the inner conductor terminal is at a proper position.