JPS5548857A - Magnetic recording and reproducing unit - Google Patents

Magnetic recording and reproducing unit

Info

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
Application number
JP12239278A
Other languages
Japanese (ja)
Inventor
Koichi Sakai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP12239278A priority Critical patent/JPS5548857A/en
Publication of JPS5548857A publication Critical patent/JPS5548857A/en
Pending legal-status Critical Current

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
JP12239278A 1978-10-03 1978-10-03 Magnetic recording and reproducing unit Pending JPS5548857A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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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