US4682232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor coupled circuit
Assignee: Canon Inc
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Filing: 1985-10-04
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Granted: 1987-07-21
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Expires: 2005-10-04
Abstract
Abstract A capacitor coupled circuit includes a power supply switch for switching power supply on; a coupling capacitor provided in a signal line; and a control circuit arranged to cause the capacitor to be charged or to be discharged in a short period of time according to the operation of the power supply switch. The arrangement enables the capacitor coupled circuit to obtain a stabilized constant output voltage in a short period of time after the power supply is switched on.
Inventors
- 👤 Tsutomu Takayama
- 👤 Seiji Hashimoto
- 👤 Toshio Kaji
- 👤 Masao Suzuki
- 👤 Akihiko Tojo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:48
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/16; H04N5/18
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
94 words
A capacitor coupled circuit comprising: (a) instructing means for instructing said capacitor coupled circuit to start an operation; (b) a coupling capacitor disposed in a signal line; (c) a current source circuit for flowing a predetermined level of current into or out of said coupling capacitor; and (d) a timing signal producing circuit for producing a timing signal to said current source circuit in such a manner that said coupling capacitor is made to effect a charging or discharging by said current source circuit in synchronism with the instruction action of said instructing means.
Claim 2
Dependent Claim
94 words
A capacitor coupled circuit comprising: (a) instructing means for instructing said capacitor coupled circuit to start an operation; (b) a coupling capacitor disposed in a signal line; (c) a current source circuit for flowing a predetermined level of current into or out of said coupling capacitor; and (d) a timing signal producing circuit for producing a timing signal to said current source circuit in such a manner that said coupling capacitor is made to effect a charging or discharging by said current source circuit in synchronism with the instruction action of said instructing means.
Claim 3
Dependent Claim
16 words
A circuit according to claim 1, wherein said current source circuit includes a clamping power source.
Claim 4
Dependent Claim
100 words
An image sensing apparatus comprising: (a) image sensing means; (b) clamping means for clamping the output of said image sensing means; (c) a capacitor arranged between said image sensing means and said clamping means to cut the DC component of the output of said image sensing means; (d) processing means for processing the output of said clamping means; (e) an actuating switch for starting an operation of said processing means; and (f) control means for controlling said clamping means in such a manner as flowing a predetermined current to said capacitor in synchronism with an action of said actuating switch.
Claim 5
Dependent Claim
100 words
An image sensing apparatus comprising: (a) image sensing means; (b) clamping means for clamping the output of said image sensing means; (c) a capacitor arranged between said image sensing means and said clamping means to cut the DC component of the output of said image sensing means; (d) processing means for processing the output of said clamping means; (e) an actuating switch for starting an operation of said processing means; and (f) control means for controlling said clamping means in such a manner as flowing a predetermined current to said capacitor in synchronism with an action of said actuating switch.
Claim 6
Dependent Claim
25 words
An apparatus according to claim 3, wherein said clamping means is arranged to periodically clamp, to a predetermined potential, a signal produced through said capacitor.
Claim 7
Dependent Claim
37 words
An apparatus according to claim 4, wherein said clamping means includes a clammping power source; and a clamping switch circuit which is arranged to periodically connect to said clamping power source said signal produced through said capacitor.
Claim 8
Dependent Claim
16 words
An apparatus according to claim 5, wherein said clamping power source includes a constant current source.
Claim 9
Dependent Claim
47 words
An apparatus according to claim 5, wherein said control means is arranged to so control said clamping switch circuit that said predetermined current flows from said clamping power source to said capacitor for a predetermined length of time in synchronism with the action of said actuating switch.
Claim 10
Dependent Claim
73 words
A signal processing device comprising: (a) a signal input channel; (b) a capacitor arranged within said channel to cut the DC component of an input signal; (c) processing means for processing a signal produced through said capacitor; (d) an actuating switch for starting an operation of said processing means; and (e) a constant current source circuit for flowing a predetermined current to said capacitor in synchronism with an action of said actuating switch.
Claim 11
Dependent Claim
73 words
A signal processing device comprising: (a) a signal input channel; (b) a capacitor arranged within said channel to cut the DC component of an input signal; (c) processing means for processing a signal produced through said capacitor; (d) an actuating switch for starting an operation of said processing means; and (e) a constant current source circuit for flowing a predetermined current to said capacitor in synchronism with an action of said actuating switch.
Claim 12
Dependent Claim
16 words
A device according to claim 8, wherein said constant current source circuit includes a switch circuit.
Claim 13
Dependent Claim
22 words
A device according to claim 8, wherein said constant current source circuit is disposed in between said capacitor and said processing means.
Claim 14
Dependent Claim
126 words
An information signal processing device for processing an information signal, comprising: (a) instructing means for instructing said information signal processing device to start an operation; (b) a capacitor for eliminating a direct current element of a DC component of said information signal; (c) a current source circuit for flowing a predetermined current into or out of said capacitor; (d) detecting means for detecting whether an instruction by said instructing means for said starting operation has been given or not; and (e) control signal producing means for outputting a control signal to said current source circuit in such a manner that said capacitor is made to effect a charging or a discharging by said current source circuit in synchronism with a detection timing in said detecting means.
Claim 15
Dependent Claim
126 words
An information signal processing device for processing an information signal, comprising: (a) instructing means for instructing said information signal processing device to start an operation; (b) a capacitor for eliminating a direct current element of a DC component of said information signal; (c) a current source circuit for flowing a predetermined current into or out of said capacitor; (d) detecting means for detecting whether an instruction by said instructing means for said starting operation has been given or not; and (e) control signal producing means for outputting a control signal to said current source circuit in such a manner that said capacitor is made to effect a charging or a discharging by said current source circuit in synchronism with a detection timing in said detecting means.
Claim 16
Dependent Claim
124 words
A capacitor coupled circuit, comprising: (a) a coupling capacitor disposed in a signal line; (b) a current source circuit being capable of supplying a predetermined current to said coupling capacitor; and (c) control means having a first mode in which said current source circuit flows said predetermined current to said coupled capacitor periodically for a first period of time and a second mode in which said current source circuit flows said predetermined current to said coupled capacitor for a second period of time which is longer than said first period of time, and controlling said current source circuit in such a manner that said current source circuit flows said predetermined current to said coupling capacitor based on said first mode or said second mode.
Claim 17
Dependent Claim
124 words
A capacitor coupled circuit, comprising: (a) a coupling capacitor disposed in a signal line; (b) a current source circuit being capable of supplying a predetermined current to said coupling capacitor; and (c) control means having a first mode in which said current source circuit flows said predetermined current to said coupled capacitor periodically for a first period of time and a second mode in which said current source circuit flows said predetermined current to said coupled capacitor for a second period of time which is longer than said first period of time, and controlling said current source circuit in such a manner that said current source circuit flows said predetermined current to said coupling capacitor based on said first mode or said second mode.
Claim 18
Dependent Claim
25 words
A circuit according to claim 12, wherein said capacitor coupled circuit further comprises instructing means for instructing said capacitor coupled circuit to start an operation.
Claim 19
Dependent Claim
39 words
A circuit according to claim 13, wherein said control means is so arranged as controlling said current source circuit in said second mode for a predetermined length of time after said instructing means instructs a start of the operation.
Claim 20
Dependent Claim
16 words
A circuit according to claim 12, wherein said current source circuit includes a clamping power source.
Claim 21
Dependent Claim
21 words
A circuit according to claim 12, which is so arranged that a video information signal is supplied to said coupling capacitor.
Claim 22
Dependent Claim
24 words
A circuit according to claim 16, wherein said capacitor coupled circuit further comprises horizontal synchronizing signal producing means for producing a horizontal synchronizing signal.
Claim 23
Dependent Claim
45 words
A circuit according to claim 17, wherein said control means is so arranged as synchronizing with said horizontal synchronizing signal after an elapse of a predetermined length of time after the circuit is started, and as controlling said current source circuit in the first mode.
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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) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |