JPS5646A - Magnetic recording and reproducing unit - Google Patents

Magnetic recording and reproducing unit

Info

Publication number
JPS5646A
JPS5646A JP7614079A JP7614079A JPS5646A JP S5646 A JPS5646 A JP S5646A JP 7614079 A JP7614079 A JP 7614079A JP 7614079 A JP7614079 A JP 7614079A JP S5646 A JPS5646 A JP S5646A
Authority
JP
Japan
Prior art keywords
motor
eddy current
torque
magnet
multifunctions
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
JP7614079A
Other languages
Japanese (ja)
Inventor
Akinobu Fujikawa
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 JP7614079A priority Critical patent/JPS5646A/en
Publication of JPS5646A publication Critical patent/JPS5646A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain the unit low in cost and life and with multifunctions, by constituting the rotation delivery mechanism of the reel turntable with the magnet and the rotating body producing the eddy current loss and giving the rotation detection mechanism by opposing this magnet to the magnetic sensing element.
CONSTITUTION: The output shaft 4 of the motor 3 is fitted with the disc 5 producing eddy current and the pulley 6 providing the back yoke 9, and further, the wheel 7 fitted with the permanent magnet 8 rotatably, and the Hall element 24 is located near the external circumference of the permanent magnet 8. When the motor 3 is a DC motor, the relation between the actual torque and the number of revolutions, due to the eddy current loss of the disc 5, is c-d"'-d" for fast traversing and rewinding, and f-f"'-f" at reproduction, by taking the number of revolutions of the reel turntable as axis of abacissa and the torque as axis of ordinate. Thus, by changing the applied voltage of the motor 3 only, the switching of torque for reproduction and fast feed is possible, and the unit can be made simple and to multifunctions only with the rotation detection function.
COPYRIGHT: (C)1981,JPO&Japio
JP7614079A 1979-06-15 1979-06-15 Magnetic recording and reproducing unit Pending JPS5646A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7614079A JPS5646A (en) 1979-06-15 1979-06-15 Magnetic recording and reproducing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7614079A JPS5646A (en) 1979-06-15 1979-06-15 Magnetic recording and reproducing unit

Publications (1)

Publication Number Publication Date
JPS5646A true JPS5646A (en) 1981-01-06

Family

ID=13596669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7614079A Pending JPS5646A (en) 1979-06-15 1979-06-15 Magnetic recording and reproducing unit

Country Status (1)

Country Link
JP (1) JPS5646A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0262913A (en) * 1988-08-30 1990-03-02 Sony Corp Rotation detecting device
US7009581B2 (en) 1995-01-11 2006-03-07 Birdwell William A Dynamic diffractive optical transform

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0262913A (en) * 1988-08-30 1990-03-02 Sony Corp Rotation detecting device
US7009581B2 (en) 1995-01-11 2006-03-07 Birdwell William A Dynamic diffractive optical transform

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