# US 8,148,852 B2 · Electronic device and printing device

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- Number: US 8,148,852 B2
- Document ID: US8148852B2
- Status: Granted
- Kind: B2
- Application number: 12/684,718
- Filed: 2010-01-08
- Published: 2010-08-26
- Granted: 2012-04-03
- Earliest claimed: 2009-02-23
- Assignees: Seiko Epson Corporation
- Inventors: Yoshiyuki Tsuganezawa
- Web page: https://patentgrep.com/patent/US8148852B2

## CPC

- G03G 15/80: {Details relating to power supplies, circuits boards, electrical connections}
- G03G 15/5004: {Power supply control, e.g. power-saving mode, automatic power turn-off}
- H02J 9/005: {using a power saving mode (for copiers G03G15/5004)}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

An electronic device controlled by software, includes a first switch that shuts off electric power supplied via a first supply line in accordance with operation by a user; a second switch that shuts off electric power supplied via a second supply line in accordance with control by the software; and a delay circuit that outputs an instruction signal for shutting off electric power supplied via the second supply line to the second switch after a first delay time which is longer than a time required for a termination process of the electronic device has passed when the first switch shut off electric power supplied via the first supply line, wherein the delay circuit stores, as a setting value, a second delay time which is shorter than the time required for the termination process of the electronic device at a time of startup of the electronic device.

## Claims

### Claim 1

An electronic device controlled by software, comprising:
a first switch that shuts off electric power supplied via a first supply line in accordance with operation by a user;
a second switch that shuts off electric power supplied via a second supply line in accordance with control by the software; and
a delay circuit that outputs an instruction signal for shutting off electric power supplied via the second supply line to the second switch after a first delay time which is longer than a time required for a termination process of the electronic device has passed when the first switch shut off electric power supplied via the first supply line,
wherein the delay circuit stores, as a setting value, a second delay time which is shorter than the time required for the termination process of the electronic device at a time of startup of the electronic device, and
in a state where the software hangs up, the delay circuit outputs the instruction signal to the second switch after the second delay time stored as the setting value has passed when the first switch shut off electric power supplied via the first supply line.

### Claim 2

An electronic device controlled by software, comprising:
a first switch that shuts off electric power supplied via a first supply line in accordance with operation by a user;
a second switch that shuts off electric power supplied via a second supply line in accordance with control by the software; and
a delay circuit that outputs an instruction signal for shutting off electric power supplied via the second supply line to the second switch after a first delay time which is longer than a time required for a termination process of the electronic device has passed when the first switch shut off electric power supplied via the first supply line,
wherein the delay circuit stores, as a setting value, a second delay time which is shorter than the time required for the termination process of the electronic device at a time of startup of the electronic device, and wherein,
in a state where the software does not hang up, the delay circuit does not output the instruction signal when the first switch shut off electric power supplied via the first supply line, and
in a state where the software hangs up, the delay circuit outputs the instruction signal to the second switch after the second delay time stored as the setting value has passed when the first switch shut off electric power supplied via the first supply line.

### Claim 3 (depends on 2)

The electronic device according to claim 2,
wherein the delay circuit includes a timer circuit, and
in a state where the software does not hang up, the delay circuit does not output the instruction signal due to count in the timer circuit being reset, when the first switch shut off electric power supplied via the first supply line.

### Claim 4 (depends on 2)

The electronic device according to claim 2,
wherein in the case where the software hangs up during the termination process, the delay circuit outputs the instruction signal to the second switch after the second delay time stored as the setting value has passed when the first switch shut off electric power supplied via the first supply line.

### Claim 5

An electronic device controlled by software, comprising:
a first switch that shuts off electric power supplied via a first supply line in accordance with operation by a user;
a second switch that shuts off electric power supplied via a second supply line in accordance with control by the software;
a delay circuit that outputs an instruction signal for shutting off electric power supplied via the second supply line to the second switch after a first delay time which is longer than a time required for a termination process of the electronic device has passed when the first switch shut off electric power supplied via the first supply line; and
a storing unit that stores information indicating that the electronic device is abnormally terminated in accordance with the output of the instruction signal by the delay circuit,
wherein the delay circuit stores, as a setting value, a second delay time which is shorter than the time required for the termination process of the electronic device at a time of startup of the electronic device,
in a state where the software does not hang up, the delay circuit does not output the instruction signal when the first switch shut off electric power supplied via the first supply line, and
in a state where the software hangs up, the delay circuit outputs the instruction signal to the second switch after the second delay time stored as the setting value has passed when the first switch shut off electric power supplied via the first supply line.

### Claim 6 (depends on 5)

The electronic device according to claim 5,
wherein in the case where the software hangs up during the termination process, the delay circuit outputs the instruction signal to the second switch after the second delay time stored as the setting value has passed when the first switch shut off electric power supplied via the first supply line.