US3930267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push button release control system for a tape recorder
Assignee: Uher Werke Muenchen GmbH and Co
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Filing: 1974-02-27
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Granted: 1975-12-30
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Expires: 1994-02-27
Abstract
Abstract An electric control circuit for releasing the push button switches in a tape recorder, particularly a cassette recorder, in which tape is advanced off one reel and wound onto another by means of a tape drive. The electric circuit contains a Darlington stage which consists of two transistors and is connected to a cut-off or push button release device. The Darlington stage is maintained non-conducting by means of a control transistor which conducts when the tape is running and actuates the cut-off device when the control transistor is non-conducting as a result of the tape being at a standstill. The cut-off device releases the individually actuated push buttons for the function sequences.
Inventors
- 👤 Helmut Plener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:29
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/02; G11B15/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
198 words
A push button release control circuit for a tape recorder such as a cassette recorder in which tape is advanced by drive means between a supply reel and a take-up reel and having a plurality of push button switches selectively movable into operable positions for activating the functional operations of the recorder comprising, in combination, normally inoperative, electrically operated means for releasing all of said push button switches from said operative positions, a pair of transistors interconnected in a Darlington stage for connecting said releasing means to an associated source of power in the conducting condition to operatively condition said releasing means, a control transistor connected to said pair of transistors and to said associated source of power, circuit means connected to said associated source of power for biasing said control transistor into a conducting condition during the advance of said tape to maintain said pair of transistors in a non-conducting condition, said circuit means being responsive to the stopping of said tape to discontinue the biasing of said control transistor and to permit said pair of transistors to conduct for operatively conditioning said releasing means to release all of said push button switches from said operative positions.
Claim 2
Dependent Claim
198 words
A push button release control circuit for a tape recorder such as a cassette recorder in which tape is advanced by drive means between a supply reel and a take-up reel and having a plurality of push button switches selectively movable into operable positions for activating the functional operations of the recorder comprising, in combination, normally inoperative, electrically operated means for releasing all of said push button switches from said operative positions, a pair of transistors interconnected in a Darlington stage for connecting said releasing means to an associated source of power in the conducting condition to operatively condition said releasing means, a control transistor connected to said pair of transistors and to said associated source of power, circuit means connected to said associated source of power for biasing said control transistor into a conducting condition during the advance of said tape to maintain said pair of transistors in a non-conducting condition, said circuit means being responsive to the stopping of said tape to discontinue the biasing of said control transistor and to permit said pair of transistors to conduct for operatively conditioning said releasing means to release all of said push button switches from said operative positions.
Claim 3
Dependent Claim
49 words
A push button release control circuit in accordance with claim 1 wherein said circuit means includes a first capacitor connected to the base of said control transistor for biasing said control transistor into a conducting condition and means for charging said first capacitor during the advance of said tape.
Claim 4
Dependent Claim
54 words
A push button release control circuit in accordance with claim 2 wherein said means for charging said first capacitor include a second capacitor and a diode connected to said first capacitor and pulse generating means connected to said associated source of power for periodically charging said second capacitor during the advance of said tape.
Claim 5
Dependent Claim
53 words
A push button release control circuit in accordance with claim 3 wherein said circuit means includes a third capacitor connected to the base of said control transistor in series relationship with said first capacitor for momentarily biasing said control transistor into a conducting condition prior to the periodic charging of said second capacitor.
Claim 6
Dependent Claim
28 words
A push button release control circuit in accordanCe with claim 4 wherein the capacitance of said third capacitor is approximately one half the capacitance of said second capacitor.
Claim 7
Dependent Claim
32 words
A push button release control circuit in accordance with claim 1, including means including a resistor for connecting the collectors of said pair of transistors to the base of said control transistor.
Claim 8
Dependent Claim
71 words
A push button release control circuit in accordance with claim 1 including a normally open, manually operated switch connected between said associated source of power and said first capacitor, said manually operated switch being arranged in operative association with one of said push button switches for movement thereby into a closed position for applying a positive biasing voltage to said control transistor to maintain said control transistors in the conducting condition.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |