US4497049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for detecting the operative face of a disc carrying data on one face only
Assignee: Staar SA
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Filing: 1983-02-18
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Granted: 1985-01-29
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Expires: 2003-02-18
Abstract
Abstract A detector system for the operative face of a disc carrying data on one face only is applicable to a laser or optical reading means which is located in turntable apparatus whereby the user is warned of the fact that the disc is placed upside-down and that, therefore, the data which it carries cannot be reproduced. A control signal is generated by the detector system, producing a warning or tripping an operation such as the rejection of the disc or the interruption of the insertion movement.
Inventors
- 👤 Stephane M. d'Alayer de Costemore d'Arc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:02
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/02; G11B19/12; G11B17/00; G11B17/02; G11B17/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
A detector system for turntable apparatus for detecting the operative face of a record disc carrying data on one face only comprising, in combination: means for reading data carried adjacent a face of a record disc and operative to produce a data or no-data signal on reading the face of a record disc in said turntable apparatus, circuit means including a delay circuit having a time constant defining a time interval, a switch actuable to start said time interval, and a memory circuit connected to the output of said reading means to receive said data or no-data signal during said time interval, said circuit means producing an output signal indicating the operative face of a record disc upon said memory circuit receiving a data signal within said time interval after said switch is actuated.
Claim 2
Dependent Claim
134 words
A detector system for turntable apparatus for detecting the operative face of a record disc carrying data on one face only comprising, in combination: means for reading data carried adjacent a face of a record disc and operative to produce a data or no-data signal on reading the face of a record disc in said turntable apparatus, circuit means including a delay circuit having a time constant defining a time interval, a switch actuable to start said time interval, and a memory circuit connected to the output of said reading means to receive said data or no-data signal during said time interval, said circuit means producing an output signal indicating the operative face of a record disc upon said memory circuit receiving a data signal within said time interval after said switch is actuated.
Claim 3
Dependent Claim
47 words
A detector system according to claim 1 wherein said turntable apparatus includes an alarm element connected to said circuit means to be operated responsive to said memory circuit receiving a no-data signal during said time interval representing a record disc with operative side inverted in the apparatus.
Claim 4
Dependent Claim
52 words
A detector system according to claim 1 wherein said turntable apparatus includes an element to reject an inverted record disc connected to said circuit means to be operated responsive to said memory circuit receiving a no-data signal during said time interval representing a record disc with operative side inverted in the apparatus.
Claim 5
Dependent Claim
58 words
A detector system according to claim 1 wherein said turntable apparatus includes an element to interrupt the introduction of a record disc into said turntable apparatus connected to said circuit means to be operated responsive to said memory circuit receiving a no-data signal during said time interval representing a record disc with operative side inverted in the apparatus.
Claim 6
Dependent Claim
56 words
A detector system according to claim 1 in which said reading means comprises a laser device and a control circuit for focusing said laser device and operative to produce a data or a no-data signal according to whether said laser device is focused on data adjacent the face of a record disc in said turntable apparatus.
Claim 7
Dependent Claim
41 words
A detector system according to claim 1 in which said reading means comprises an opto-electronic device operative to produce a data or a no-data signal according to whether said opto-electronic device detects data adjacent one operative face of a record disc.
Claim 8
Dependent Claim
32 words
A detector system according to claim 6 in which said opto-electronic device comprises a light emitting diode and a receiver diode for reading data reflected from the face of a record disc.
Claim 9
Dependent Claim
40 words
A detector system according to claim 1 in which said memory circuit comprises a flip-flop logic circuit connected to the reading means and operative to deliver an output signal according to the condition of the signal from said reading means.
Claim 10
Dependent Claim
16 words
A detector system according to claim 1 in which said memory circuit comprises a flip-flop circuit.
Claim 11
Dependent Claim
132 words
A detector system for turntable apparatus for detecting the operative face of a record disc carrying data on one face only comprising, in combination: means for reading data carried adjacent a face of a record disc and operative to produce a data or a no-data signal on reading the face of a record disc in said turntable apparatus, a delay circuit having a time constant defining a time interval, a logic circuit connected to the output of said reading means to represent by its state the receipt of a data or a no-data signal during said time interval, and a circuit connected to operate elements of said turntable apparatus responsive to the state of said logic circuit representing a no-data signal indicating a record disc in the apparatus with operative side inverted.
Claim 12
Dependent Claim
132 words
A detector system for turntable apparatus for detecting the operative face of a record disc carrying data on one face only comprising, in combination: means for reading data carried adjacent a face of a record disc and operative to produce a data or a no-data signal on reading the face of a record disc in said turntable apparatus, a delay circuit having a time constant defining a time interval, a logic circuit connected to the output of said reading means to represent by its state the receipt of a data or a no-data signal during said time interval, and a circuit connected to operate elements of said turntable apparatus responsive to the state of said logic circuit representing a no-data signal indicating a record disc in the apparatus with operative side inverted.
References Cited (Backward Citations)
JPS5538663A
Cited
US4337532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |