Device for sensing rotary head position of magnetic recording an

Details Device for sensing rotary head position of magnetic recording an Device for sensing rotary head position of magnetic recording an

1992-05-26

1993-12-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502221, 360 7712, G11B 555

Patent

active

052705293

ABSTRACT:
An apparatus of sensing a position for a recording and reproducing device, having first and second light receiving devices of the same photoelectric transfer characteristic, a light emitting device opposite to the first and second light receiving devices, a device entering part of light from the light emitting device into the first light receiving device, the luminous energy of light received by the first light receiving device being independent of a position of the recording and reproducing device, a device entering part of light from the light emitting device into the second light receiving device, the luminous energy of light received by the second light receiving device depending on the position of the recording and reproducing device, and a device controlling the luminous energy of light emitted by the light emitting device so that an output of the first light receiving device is continuously uniform. The apparatus produces an accurate positional signal of the recording and reproducing device independent of narrow and wide changes in environment temperature. A use of a pair of corresponding apparatuses produces a differential signal of complementary positional signals of the recording and reproducing device which is free from a drift at the home position of the recording and reproducing device.

REFERENCES:
patent: 3582661 (1971-06-01), Emmasingel
patent: 3944813 (1976-03-01), Fowler
patent: 4074143 (1978-02-01), Rokos
patent: 4639796 (1987-01-01), Solhjell
patent: 5130556 (1992-07-01), Duncan et al.

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