US5157270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reset signal generating circuit
Assignee: Canon Inc
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Filing: 1991-02-01
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Granted: 1992-10-20
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Expires: 2011-02-01
Abstract
Abstract A reset signal generating circuit comprises a switching circuit arranged to supply an on/off control signal to a switching element which controls an on/off action of a power source; and a reset circuit arranged to detect the level of the on/off control signal and to forcedly produce a reset signal before the power source is turned off.
Inventors
- 👤 Shinji Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:16
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
A reset signal generating circuit comprising: a power source for supplying electric power to a load circuit including a microcomputer and a regulator, said regulator providing electric power at a predetermined voltage level to said microcomputer; switching control means for supplying an on/off control signal to a switching element for controlling an on/off action of said power source; and reset means for producing a reset signal for resetting said microcomputer in response to an output of said switching control means at a time before the voltage level provided by said regulator drops below said predetermined voltage level.
Claim 2
Dependent Claim
97 words
A reset signal generating circuit comprising: a power source for supplying electric power to a load circuit including a microcomputer and a regulator, said regulator providing electric power at a predetermined voltage level to said microcomputer; switching control means for supplying an on/off control signal to a switching element for controlling an on/off action of said power source; and reset means for producing a reset signal for resetting said microcomputer in response to an output of said switching control means at a time before the voltage level provided by said regulator drops below said predetermined voltage level.
Claim 3
Dependent Claim
28 words
A circuit according to claim 1, wherein said reset means resets said microcomputer before the power supply to said load circuit is turned off by said switching element.
Claim 4
Dependent Claim
91 words
A reset signal generating circuit comprising: switching means for supplying an on/off signal to a switching element which controls an on/off action of a power source, said power source including a regulator for providing electric power at a predetermined voltage level to a load circuit, said load circuit including a microcomputer; and reset means for detecting a level of said on/off signal and for producing a reset signal, said reset signal resetting said microcomputer at a time before the voltage level provided by said regulator drops below said predetermined voltage level.
Claim 5
Dependent Claim
91 words
A reset signal generating circuit comprising: switching means for supplying an on/off signal to a switching element which controls an on/off action of a power source, said power source including a regulator for providing electric power at a predetermined voltage level to a load circuit, said load circuit including a microcomputer; and reset means for detecting a level of said on/off signal and for producing a reset signal, said reset signal resetting said microcomputer at a time before the voltage level provided by said regulator drops below said predetermined voltage level.
Claim 6
Dependent Claim
28 words
A circuit according to claim 3, wherein said reset means resets said microcomputer before the power supply to said load circuit is turned off by said switching element.
Claim 7
Dependent Claim
98 words
A reset signal generating circuit comprising: a) a power source; b) a regulator for stabilizing an output of said power source to a predetermined voltage level; c) a load circuit connected to an output terminal of said regulator; d) instructing means for producing an instruction signal for stopping a supply of power by said regulator to said load circuit; and e) reset means for resetting said load circuit in response to an output of said instructing means at a time before the voltage level provided by said regulator to said load circuit drops below said predetermined voltage level.
Claim 8
Dependent Claim
98 words
A reset signal generating circuit comprising: a) a power source; b) a regulator for stabilizing an output of said power source to a predetermined voltage level; c) a load circuit connected to an output terminal of said regulator; d) instructing means for producing an instruction signal for stopping a supply of power by said regulator to said load circuit; and e) reset means for resetting said load circuit in response to an output of said instructing means at a time before the voltage level provided by said regulator to said load circuit drops below said predetermined voltage level.
Claim 9
Dependent Claim
21 words
A circuit according to claim 5, wherein said load circuit includes an electronic circuit which is reset by said reset means.
Claim 10
Dependent Claim
13 words
A circuit according to claim 6, wherein said electronic circuit includes a microcomputer.
Claim 11
Dependent Claim
28 words
A circuit according to claim 7, wherein said reset means resets said microcomputer before the power supply to said load circuit is turned off by said switching element.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |