JPS5646A - Magnetic recording and reproducing unit - Google Patents
Magnetic recording and reproducing unitInfo
- 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
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
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)
| 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 |
-
1979
- 1979-06-15 JP JP7614079A patent/JPS5646A/en active Pending
Cited By (2)
| 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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