Patent US6200328B1 successfully refreshed from Google Patents.
Patent US4083019A successfully refreshed from Google Patents.
US4083019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current controlled emitter coupled multivibrator
Assignee: Sony Corp
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Filing: 1976-12-01
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Granted: 1978-04-04
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Expires: 1996-12-01
Abstract
Abstract A multivibrator circuit has a main constant current source through which the main portion of the current of the multivibrator circuit is supplied and a by-pass current source through which a portion of the current to be supplied to the main constant current source is supplied, whereby the duty cycle of the multivibrator circuit is controlled. When the by-pass current is changed, the frequency of the multivibrator circuit is changed. The frequency of the multivibrator, when used as the frequency-modulated oscillator in a video tape recorder, may thus be set regardless of the signal clipping level and signal clamping level in a video recording circuit of the video tape recorder.
Inventors
- 👤 Takeshi Hamada
- 👤 Yoshio Ishigaki
- 👤 Masayuki Hongu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/28; H03K3/281; H03K3/282; H03K3/2821; H03K7/00; H03K7/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
270 words
A circuit comprising a frequency controllable multivibrator comprising: A. first and second transistors each including a base electrode, an emitter electrode and a collector electrode, said collector electrodes of said first and second transistors being coupled to said base electrodes of said second and first transistors, respectively; B. voltage supply means for supplying a voltage; C. first and second load elements connecting respective ones of said collector electrodes of said first and second transistors to said voltage supply means; D. a capacitor connected between said emitter electrodes of said first and second transistors for enabling conduction of the latter alternately; E. a pair of current controlling devices each including input, output and common electrodes, said input and output electrodes of each of said pair of current controlling devices being connected respectively to said collector and emitter electrodes of a respective one of said first and second transistors for controlling said devices with output signals of said first and second transistors; F. a common main current source comnecting said common electrodes of said pair of current controlling devices to said voltage supply means and through which a relatively large main current is fed from said pair of current controlling devices alternately; and G. a common by-pass current control means connected to each side of said capacitor and through at least a portion of which a relatively small controllable portion of said relatively large current to be supplied to said common main current source is fed for minimizing lost power, said common by-pass current control means also controlling another current to said capacitor for determining an oscillation characteristic of said multivibrator circuit.
Claim 2
Dependent Claim
270 words
A circuit comprising a frequency controllable multivibrator comprising: A. first and second transistors each including a base electrode, an emitter electrode and a collector electrode, said collector electrodes of said first and second transistors being coupled to said base electrodes of said second and first transistors, respectively; B. voltage supply means for supplying a voltage; C. first and second load elements connecting respective ones of said collector electrodes of said first and second transistors to said voltage supply means; D. a capacitor connected between said emitter electrodes of said first and second transistors for enabling conduction of the latter alternately; E. a pair of current controlling devices each including input, output and common electrodes, said input and output electrodes of each of said pair of current controlling devices being connected respectively to said collector and emitter electrodes of a respective one of said first and second transistors for controlling said devices with output signals of said first and second transistors; F. a common main current source comnecting said common electrodes of said pair of current controlling devices to said voltage supply means and through which a relatively large main current is fed from said pair of current controlling devices alternately; and G. a common by-pass current control means connected to each side of said capacitor and through at least a portion of which a relatively small controllable portion of said relatively large current to be supplied to said common main current source is fed for minimizing lost power, said common by-pass current control means also controlling another current to said capacitor for determining an oscillation characteristic of said multivibrator circuit.
Claim 3
Dependent Claim
48 words
A circuit according to claim 1; in which said main current source includes a constant current source element common to said pair of current controlling devices and having an input terminal, a common terminal connected in common to said pair of current controlling devices, and an output terminal.
Claim 4
Dependent Claim
31 words
A circuit according to claim 2; in which said input terminal controls said constant current source element, whereby said constant current can be modulated with a signal to said input terminal.
Claim 5
Dependent Claim
28 words
A circuit according to claim 3; in which said element is constituted by a transistor having base, emitter and collector electrodes forming said input, output and common terminals.
Claim 6
Dependent Claim
33 words
A circuit according to claim 3; further comprising means applying a modulating signal to said input terminal for varying the current through said element so that the frequency of said multivibrator is modulated.
Claim 7
Dependent Claim
37 words
A circuit according to claim 5; further comprising a video recording clamping circuit; and in which said input terminal of said controllable device is connected to said clamping circuit, and said modulating signal is a video signal.
Claim 8
Dependent Claim
41 words
A circuit according to claim 5; further comprising a video recording white level clipping circuit; and in which said modulating signal is a video signal, and said output terminal of said controllable device is connected to said white level clipping circuit.
Claim 9
Dependent Claim
37 words
A circuit according to claim 5; further comprising a video recording pre-emphasis circuit; and in which said modulating signal is a video signal, and the common terminal of said controllable device is connected to said pre-emphasis circuit.
Claim 10
Dependent Claim
28 words
A circuit according to claim 1; in which said by-pass current control means includes a first variable resistor means for determining the duty ratio of said multivibrator circuit.
Claim 11
Dependent Claim
36 words
A circuit according to claim 9; in which said first variable resistor means comprises a potentiometer having a resistive element and an arm movable along the latter, and means for applying a voltage to said arm.
Claim 12
Dependent Claim
38 words
A circuit according to claim 10; in which said by-pass current control means further includes a second variable resistor for controlling the voltage applied to said arm of said potentiometer for determining the frequency of said multivibrator circuit.
Claim 13
Dependent Claim
26 words
A circuit according to claim 1; in which said by-pass current control means includes a variable resistor means for determining the frequency of said multivibrator circuit.
Claim 14
Dependent Claim
32 words
A circuit according to claim 12; in which said by-pass current control means further includes an inductance coupled across said capacitor by which the duty ratio of said multivibrator circuit is controlled.
Claim 15
Dependent Claim
34 words
A circuit according to claim 13; in which said by-pass current control means further includes a resistor forming a series circuit with said inductance, and said series circuit is in parallel with said capacitor.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |