# US 2021/0240141 A1 · Conductive balance-spring cord

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- Number: US 2021/0240141 A1
- Document ID: US20210240141A1
- Status: Published application
- Kind: A1
- Application number: 17/146,793
- Filed: 2021-01-12
- Published: 2021-08-05
- Earliest claimed: 2020-01-30
- Assignees: ETA SA Manufacture Horlogere Suisse
- Applicants: Eta SA Manufacture HorlogèRe Suisse
- Inventors: Sylvain HUOT-MARCHAND
- Web page: https://patentgrep.com/patent/US20210240141A1

## CPC

- G04B 17/325: {for fastening the hairspring in a fixed position, e.g. using a block}
- G04D 3/0089: {for components of the regulating mechanism, e.g. coil springs}
- B05D 1/02: performed by spraying
- H05F 3/00: Carrying-off electrostatic charges ({from shoes A43B7/36}; from living beings A61N1/14; {from tyres B60C19/08; from vehicles B60R16/06; from aircraft B64D45/02; from large containers B65D90/46})
- G04B: MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS (spring- or weight-driven mechanisms in general F03G; electromechanical clocks or watches G04C; electromechanical clocks with attached or built-in means operating any device at pre-selected times or after predetermined time intervals G04C23/00; clocks or watches with stop devices G04F7/08)
- G04D: APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- H05F: STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY

## Abstract

A deposition method (500) of an electroconductive layer electrically connecting at least one outer coil (105) and a balance-spring stud (102) and representing at least 1%, particularly 5%, preferably 10% and/or at most 90%, particularly at most 75%, preferably at most 50% of at least one dimension of a horological balance-spring (101).

## Claims

### Claim 1

A deposition method of an electroconductive layer on an oscillating system of a horological movement comprising a horological balance-spring with at least one internal coil attached by a collet; said deposition method comprising a step of:
providing said oscillating system; and
depositing at least a first electroconductive layer carried out by an atomiser (900) electrically connecting said at least one outer coil and said balance-spring stud and representing at least 1% of at least one dimension of said horological balance-spring,
wherein said atomiser comprises at least a first electroconductive layer in liquid form surrounded by a sheathing gas so as to be unidirectional.

### Claim 2 (depends on 1)

The deposition method according to claim 1, wherein said at least a first electroconductive layer is deposited on the outside of said balance-spring stud.

### Claim 3 (depends on 1)

The deposition method according to claim 1, wherein said atomiser is unidirectional.

### Claim 4 (depends on 1)

The deposition method according to claim 1, wherein said first electroconductive layer comprises a continuous electroconductive layer and/or a plurality of discrete electroconductive layers so as to form a continuous electroconductive layer.

### Claim 5 (depends on 1)

The deposition method according to claim 1, wherein said at least one dimension is the length of said horological balance-spring.

### Claim 6 (depends on 1)

The deposition method according to claim 1, wherein the first electroconductive layer represents 5% of at least one dimension of said horological balance-spring.

### Claim 7 (depends on 1)

The deposition method according to claim 1, wherein the first electroconductive layer represents 10% of at least one dimension of said horological balance-spring.

### Claim 8 (depends on 1)

The deposition method according to claim 1, wherein the first electroconductive layer represents at most 90% of at least one dimension of said horological balance-spring.

### Claim 9 (depends on 1)

The deposition method according to claim 1, wherein the first electroconductive layer represents at most 75% of at least one dimension of said horological balance-spring.

### Claim 10 (depends on 1)

The deposition method according to claim 1, wherein the first electroconductive layer represents at most 50% of at least one dimension of said horological balance-spring.

### Claim 11 (depends on 1)

The deposition method according to claim 1, wherein the first electroconductive layer represents at least 1% and at most 90% of at least one dimension of said horological balance-spring.