US3846624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic clearing device
Assignee: Canon Inc
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Filing: 1973-05-11
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Granted: 1974-11-05
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Expires: 1993-05-11
Abstract
Abstract In an electronic instrument having a storage unit, an automatic clearing device utilizes a portion of the storage unit as a constituent. A synchronizing signal generator generates a synchronizing signal in response to revolutions of an electric motor. A clear signal generating circuit generates output adapted to change from one state to another state when a power source is connected and to change from said another to said one state upon arrival of the synchronizing signal. A signal representative of the state change is applied to the storage unit portion as a clear signal, whereby the storage in the storage unit portion may be cleared.
Inventors
- 👤 T Kawanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:33
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/353; H03K3/356; H03K3/356008; G; G06; G06F; G06F15/00; G06F15/02; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/41; G11C11/413; G11C11/417; G11C11/419; G11C7/00; G11C7/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
An automatic clearing device comprising: storage means whose storage is to be cleared upon connection of a power source to said device; synchRonizing signal generating means for generating a synchronizing signal in accordance with revolutions of an electric motor driven by said power source; clear signal generating means coupled to said synchronizing signal generating means for generating output, adapted to change from one state to another state upon connection of the power source and change from said another state to said one state upon arrival of said synchronizing signal; and means coupled between said storage means and said signal generating means for applying as a clear signal to said storage means a signal resulting from the change of the state of said clear signal generating means.
Claim 2
Dependent Claim
126 words
An automatic clearing device comprising: storage means whose storage is to be cleared upon connection of a power source to said device; synchRonizing signal generating means for generating a synchronizing signal in accordance with revolutions of an electric motor driven by said power source; clear signal generating means coupled to said synchronizing signal generating means for generating output, adapted to change from one state to another state upon connection of the power source and change from said another state to said one state upon arrival of said synchronizing signal; and means coupled between said storage means and said signal generating means for applying as a clear signal to said storage means a signal resulting from the change of the state of said clear signal generating means.
Claim 3
Dependent Claim
40 words
An automatic clearing device according to claim 1, wherein said synchronizing signal generating means includes means for preventing said electric motor from generating a synchronizing signal until its revolutions attain a predetermined velocity after the power source has been connected.
Claim 4
Dependent Claim
143 words
An automatic clearing device comprising: storage means whose storage is to be cleared upon connection of a power source; synchronizing signal generating means for generating a synchronizing signal in accordance with revolutions of an electric motor; clear signal generating means including a flip-flop circuit to which the output from said synchronizing signal generating means is applied as control signal, and means for determining the initial state of said flip-flop circuit, the output of said flip-flop changing from one state to another state determined by said means for determining upon connection of the power source and changing from said another state to said one state upon application of the synchronizing signal from said synchronizing signal generator means; and means for applying as a clear signal to said storage means a signal resulting from the variation of the output of said clear signal generating circuit.
Claim 5
Dependent Claim
143 words
An automatic clearing device comprising: storage means whose storage is to be cleared upon connection of a power source; synchronizing signal generating means for generating a synchronizing signal in accordance with revolutions of an electric motor; clear signal generating means including a flip-flop circuit to which the output from said synchronizing signal generating means is applied as control signal, and means for determining the initial state of said flip-flop circuit, the output of said flip-flop changing from one state to another state determined by said means for determining upon connection of the power source and changing from said another state to said one state upon application of the synchronizing signal from said synchronizing signal generator means; and means for applying as a clear signal to said storage means a signal resulting from the variation of the output of said clear signal generating circuit.
Claim 6
Dependent Claim
24 words
An automatic clearing device according to claim 3, wherein said means for determining comprises a capacitor and a switching element controlled by said capacitor.
Claim 7
Dependent Claim
57 words
An automatic clearing device according to claim 4, wherein said capacitor includes means for controlling said switching elements so that said switching element controlled by said capacitor is actuated after the connection of the power source in a shorter time than the time required from the connection of the power source until the synchronizing signal is generated.
Claim 8
Dependent Claim
62 words
An automatic clearing device according to claim 1, wherein said synchronizing signal generating means comprises a permanent magnet securely mounted on a rotary disc secured to the rotary shaft of said electric motor, a magnetic flux detecting element provided separately from said rotary disc and adjacent to said permanent magnet, and an amplifier for amplifying the signal detected by said detecting element.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |