Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1981-07-01
1983-09-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356395, G01D 534
Patent
active
044069464
ABSTRACT:
The pulse signal generating device for a tape recorder comprises a rotary plate attached to a rotating shaft portion of the tape recorder which rotates in connection with tape running. The rotary plate has a central axis, and rotates together with the rotating shaft portion around the central axis. The outer peripheral surface of the rotating body includes at least one first surface portion with a higher reflection factor and at least one second surface portion with a lower reflection factor. The first and second surface portions adjoin each other along the circumferential direction, and are located at different distances from the central axis. The pulse signal generating device further comprises a photo-reflector facing the outer peripheral surface of the rotary plate. The photo-reflector includes a light emitting element for emitting light toward the outer peripheral surface and a light receiving element to receive light reflected from the outer peripheral surface. The light receiving element produces pulse signals in response to light reflected from the first and second surface portions, severally.
REFERENCES:
patent: 4097726 (1978-06-01), Satoh
Hostetter Darwin R.
Nelms David C.
Olympus Optical Co,. Ltd.
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