JPS5548857A - Magnetic recording and reproducing unit - Google Patents
Magnetic recording and reproducing unitInfo
- Publication number
- JPS5548857A JPS5548857A JP12239278A JP12239278A JPS5548857A JP S5548857 A JPS5548857 A JP S5548857A JP 12239278 A JP12239278 A JP 12239278A JP 12239278 A JP12239278 A JP 12239278A JP S5548857 A JPS5548857 A JP S5548857A
- Authority
- JP
- Japan
- Prior art keywords
- tape
- motor
- winding diameter
- winding
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To keep constant for the tape tensile tension during full tape running time, by controlling the winding torque through the detection of tape winding diameter.
CONSTITUTION: The number of pulses is detected by the Hall IC3 during a given time to measure the tape winding diameter, the supply voltage to the motor 4 is changed depending on the output of winding diameter detection to control the winding torque. The pulse from the Hall IC3 is compared with the reference counts N1,N2... from the comparison circuit 16 via the count circuit 12 and memory circuit 15, and the result of comparison is fed to the motor drive circuit 17 with two output lines O1 and O2. At the start of tape, since the outputs O1 and O2 are both at H, the transistors Q3 and Q4 are conductive to minimize the applied voltage to motor. At the end of tape, the outputs O1 and O2 are both at L, the transistors Q3,Q4 are non-conductive, the voltage applied to the motor is increased to obtain a strong torque. Thus, tape tensile tension can be kept constant.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12239278A JPS5548857A (en) | 1978-10-03 | 1978-10-03 | Magnetic recording and reproducing unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12239278A JPS5548857A (en) | 1978-10-03 | 1978-10-03 | Magnetic recording and reproducing unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5548857A true JPS5548857A (en) | 1980-04-08 |
Family
ID=14834652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12239278A Pending JPS5548857A (en) | 1978-10-03 | 1978-10-03 | Magnetic recording and reproducing unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5548857A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS576456A (en) * | 1980-06-13 | 1982-01-13 | Victor Co Of Japan Ltd | Tape tension control system of recording and reproducing device |
JPS576457A (en) * | 1980-06-13 | 1982-01-13 | Victor Co Of Japan Ltd | Tape tension control system of recording and reproducing device |
JPS5958648A (en) * | 1982-09-28 | 1984-04-04 | Akai Electric Co Ltd | Tape winding device |
JPS62175954A (en) * | 1986-01-30 | 1987-08-01 | Matsushita Electric Ind Co Ltd | Magnetic recording and reproducing device |
-
1978
- 1978-10-03 JP JP12239278A patent/JPS5548857A/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS576456A (en) * | 1980-06-13 | 1982-01-13 | Victor Co Of Japan Ltd | Tape tension control system of recording and reproducing device |
JPS576457A (en) * | 1980-06-13 | 1982-01-13 | Victor Co Of Japan Ltd | Tape tension control system of recording and reproducing device |
JPS6224865B2 (en) * | 1980-06-13 | 1987-05-30 | Victor Company Of Japan | |
JPS5958648A (en) * | 1982-09-28 | 1984-04-04 | Akai Electric Co Ltd | Tape winding device |
JPS62175954A (en) * | 1986-01-30 | 1987-08-01 | Matsushita Electric Ind Co Ltd | Magnetic recording and reproducing device |
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