# US 2019/0170556 A1 · Flow sensor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0170556 A1
- Document ID: US20190170556A1
- Status: Published application
- Kind: A1
- Application number: 16/095,836
- Filed: 2017-02-27
- Published: 2019-06-06
- Earliest claimed: 2016-04-26
- Assignees: Koa Corporation
- Applicants: Koa Corporation
- Inventors: Tomokazu IKENO
- Web page: https://patentgrep.com/patent/US20190170556A1

## CPC

- G01F 1/692: Thin-film arrangements
- G01F 15/022: {using electrical means}
- G01F 1/684: Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F 1/69: of resistive type
- G01F 1/696: Circuits therefor, e.g. constant-current flow meters
- G01F 1/698: Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
- G01P 5/12: using variation of resistance of a heated conductor
- G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G})

## Abstract

To provide a flow sensor having improved responsiveness compared to the prior art, the flow sensor of the present invention includes an insulation board, a flow-rate detection resistance element, and a temperature compensation resistance element. Each of the flow-rate detection resistance element and the temperature compensation resistance element is arranged on the insulation board such that a terminal temperature of the temperature compensation resistance element approaches a terminal temperature of the flow-rate detection resistance element. Accordingly, responsiveness can be improved.

## Claims

### Claim 1

A flow sensor comprising:
an insulation board;
a flow-rate detection resistance element; and
a temperature compensation resistance element,
wherein each of the flow-rate detection resistance element and the temperature compensation resistance element is arranged on the insulation board such that a terminal temperature of the temperature compensation resistance element approaches a terminal temperature of the flow-rate detection resistance element.

### Claim 2

A flow sensor comprising:
an insulation board;
a flow-rate detection resistance element; and
a temperature compensation resistance element,
wherein the flow-rate detection resistance element is arranged on a front face side of the insulation board, and
the temperature compensation resistance element is arranged on a back face side of the insulation board oppositely to the flow-rate detection resistance element by interposing the insulation board.

### Claim 3 (depends on 1)

The flow sensor according to claim 1, wherein the temperature compensation resistance element is arranged such that a contact with fluid is obstructed, compared to the flow-rate detection resistance element.

### Claim 4 (depends on 1)

The flow sensor according to claim 1, wherein the insulation board has an element mount portion, a support portion separated from the element mount portion, and a connecting portion configured to connect the element mount portion and the support portion to each other and have a width narrower than that of the element mount portion, and
each of the flow-rate detection resistance element and the temperature compensation resistance element is arranged inside the element mount portion.

### Claim 5 (depends on 4)

The flow sensor according to claim 4, wherein the support portion surrounds the element mount portion by interposing a slit, and
the element mount portion and the support portion are connected to each other by a plurality of the connecting portions.

### Claim 6 (depends on 4)

The flow sensor according to claim 4, further comprising a lid arranged on a back face of the element mount portion and provided with a concave portion,
wherein the temperature compensation resistance element is arranged inside the concave portion on the back face of the element mount portion.

### Claim 7 (depends on 1)

The flow sensor according to claim 1, wherein the flow-rate detection resistance element and the temperature compensation resistance element have a ceramic substrate, a resistor layer provided on a front face of the ceramic substrate, and a terminal electrically connected to the resistor layer and provided on a front face of the ceramic substrate.