Patent US3766329A successfully refreshed from Google Patents.
US3766329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for cutting off the signal in a recording tape recorder at the end of recording
Assignee: Victor Company of Japan Ltd
•
Filing: 1972-05-24
•
Granted: 1973-10-16
•
Expires: 1992-05-24
Abstract
Abstract A device for cutting off a recording signal at the end of a recording operation in a cartridge type tape recorder, which device operates at the time of stopping of a recording operation to cause a variation in the frequency characteristic of a trap circuit for trapping a high-frequency bias and inserted in a recording signal transmission path, thereby to cut off the recording signal.
Inventors
- 👤 S Katoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/22; G11B15/02; G11B15/16; G11B5/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A device for cutting off a recording signal at the end of a recording operation in a tape recorder comprising, a recording amplifier, an information signal source connected to the input of said recording amplifier, a magnetic recording head, high frequency bias means connected to said magnetic recording head, high frequency bias trap means connected between said recording amplifier and magnetic recording head wherein said bias trap means consists of a parallel resonant circuit having an inductor and a capacitor, switching means connected in series with said inductor, and switch actuating means which closes said switch means during recording and opens said switch means at the end of the recording operation.
Claim 2
Independent Claim
111 words
A device for cutting off a recording signal at the end of a recording operation in a tape recorder comprising, a recording amplifier, an information signal source connected to the input of said recording amplifier, a magnetic recording head, high frequency bias means connected to said magnetic recording head, high frequency bias trap means connected between said recording amplifier and magnetic recording head wherein said bias trap means consists of a parallel resonant circuit having an inductor and a capacitor, switching means connected in series with said inductor, and switch actuating means which closes said switch means during recording and opens said switch means at the end of the recording operation.
Claim 3
Dependent Claim
78 words
The device for cutting off a recording signal as defined in claim 1 wherein said parallel resonant circuit has a frequency response capable of interrupting the passage of the high frequency bias signal from said high frequency bias means and permitting the pasage of the recording signal when said switch means is closed, and when said switch means is opened the frequency response of said parallel resonant circuit becomes capable of interrupting the passage of the recording signal.
Claim 4
Independent Claim
165 words
A device for cutting off a recording signal at the end of the recording operation in a cartridge type tape recorder comprising, a recording amplifier, an information signal source connected to the input of said recording amplifier, a magnetic recording head, high frequency bias means connected to said magnetic recording head, high frequency bias trap means connected between said recording amplifier and magnetic recording head having a first stage and second stage frequency response wherein said first stage is capable of interrupting the passage of the high frequency bias signal from said high frequency bias means and permitting the passage of the recording signal, and said second stage is capable of interrupting said recording signal, switch means for switching said high frequency bias trap means from said first stage to said second stage, and switch actuating means which actuates said switch means to switch said high frequency bias trap means from said first stage to said second stage at the end of the recording operation.
Claim 5
Independent Claim
165 words
A device for cutting off a recording signal at the end of the recording operation in a cartridge type tape recorder comprising, a recording amplifier, an information signal source connected to the input of said recording amplifier, a magnetic recording head, high frequency bias means connected to said magnetic recording head, high frequency bias trap means connected between said recording amplifier and magnetic recording head having a first stage and second stage frequency response wherein said first stage is capable of interrupting the passage of the high frequency bias signal from said high frequency bias means and permitting the passage of the recording signal, and said second stage is capable of interrupting said recording signal, switch means for switching said high frequency bias trap means from said first stage to said second stage, and switch actuating means which actuates said switch means to switch said high frequency bias trap means from said first stage to said second stage at the end of the recording operation.
Claim 6
Dependent Claim
59 words
The device as defined in claim 3 wherein said high frequency bias trap means consists of a parallel resonant circuit including an inductor and a capacitor, said switching means is connected in series with said inductor, and said switch actuating means closes said switch means during recording and opens said switch means at the end of the recording operation.
References Cited (Backward Citations)
US3019302A
Cited
US3480739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |