Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Counting on an object – areas having alternating physical...
Patent
1988-09-16
1990-05-08
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Counting on an object, areas having alternating physical...
377 45, 377 55, 307354, 307360, H03K 524, H03K 2102
Patent
active
049244833
ABSTRACT:
A track counting circuit for an optical disk driver is disclosed. The pickup passing a track is detected through a differential amplifier receiving signals from photo diodes, an amplifier, a tracking processor, a positive zero crossing detector, and a negative zero crossing detector. The signals sensed by photo diodes are applied to one of the input terminals of each of a pair of NAND gates through a differential amplifier, level comparators and a flip-flop, and the other input terminals of the NAND gates receive the signals which are obtained by the signals sensed by the photo diodes being processed through an adder and a level comparator to distinguish whether the pickup is placed on the track or land of the disk, the output signals of the NAND gates controlling the output signals of a flip-flop which control an up/down counter to make an up/down count depending on the moving direction of the pickup on the track so that the intended track is found precisely and easily.
REFERENCES:
patent: 3588885 (1971-06-01), Schaal
patent: 4220849 (1980-09-01), Harzar
patent: 4306220 (1981-12-01), Schwefel et al.
patent: 4352010 (1982-09-01), Koogler
patent: 4475086 (1984-10-01), Allen
patent: 4528682 (1985-07-01), Nakaoki
Heyman John S.
Samsung Electronics Co,. Ltd.
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