# US 9,437,920 B2 · Push-button switch

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- Number: US 9,437,920 B2
- Document ID: US9437920B2
- Status: Granted
- Kind: B2
- Application number: 14/585,445
- Filed: 2014-12-30
- Published: 2015-07-30
- Granted: 2016-09-06
- Earliest claimed: 2014-01-29
- Assignees: Alps Electric Co., Ltd.
- Applicants: Alps Electric Co., Ltd.
- Inventors: Takashi Sano; Tetsuya Sago
- Web page: https://patentgrep.com/patent/US9437920B2

## CPC

- H01Q 1/3233: {particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems}
- H01H 3/12: Push-buttons
- H01H 13/023: {Light-emitting indicators (for multi-layer switches H01H13/83)}
- H01H 13/14: Operating parts, e.g. push-button
- H01Q 1/2216: {used in interrogator/reader equipment}
- H01Q 1/3241: {particular used in keyless entry systems}
- H01Q 7/06: with core of ferromagnetic material (H01Q7/02 takes precedence)
- H01Q 7/08: Ferrite rod or like elongated core
- H01H 2231/026: Car
- H01H 2239/024: with inductive switch
- H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72)
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)

## Abstract

A push-button switch includes a wiring board having a first surface on which electronic components are mounted. The push-button switch is used for an immobilizer system and supplies power to a portable device from the first surface side of the wiring board. The push-button switch includes a coil antenna and a conductor pattern. The coil antenna includes a magnetic core and a coil conductor wound around the magnetic core. The coil antenna is attached to a second surface of the wiring board. The conductor pattern is formed in at least one wiring layer so as to surround the coil conductor in plan view. The wiring board has an inner layer including the at least one wiring layer. A direction of current flowing through the coil conductor is the same as a direction of current flowing through the conductor pattern.

## Claims

### Claim 1

A push-button switch including a wiring board having a first surface on which electronic components are mounted, the push-button switch being used for an immobilizer system and supplying power to a portable device from the first surface side of the wiring board, the push-button switch comprising:
a coil antenna including a magnetic core and a coil conductor wound around the magnetic core, the coil antenna being attached to a second surface of the wiring board; and
a conductor pattern formed in at least one wiring layer so as to surround the coil conductor in plan view, the wiring board having an inner layer including the at least one wiring layer,
wherein the coil conductor is connected to the conductor pattern, and
wherein a direction of current flowing through the coil conductor is the same as a direction of current flowing through the conductor pattern.

### Claim 2 (depends on 1)

The push-button switch according to claim 1,
wherein the conductor pattern is formed along an outer edge of the wiring board, and
wherein the coil conductor is inscribed in the conductor pattern in plan view.

### Claim 3 (depends on 2)

The push-button switch according to claim 2,
wherein the at least one wiring layer in the inner layer includes a plurality of wiring layers,
wherein the conductor pattern is formed by using at least a first conductor pattern and a second conductor pattern, and the first conductor pattern and the second conductor pattern are formed in a spiral shape in two respective wiring layers among the plurality of wiring layers, and
wherein an outermost turn of the first conductor pattern is connected to the coil conductor, and an innermost turn of the first conductor pattern is connected to an innermost turn of the second conductor pattern.

### Claim 4 (depends on 1)

The push-button switch according to claim 1,
wherein the electronic components mounted on the first surface of the wiring board include a light emitting device.