Apparatus for a record player distinguishing between recorded an

Details Apparatus for a record player distinguishing between recorded an Apparatus for a record player distinguishing between recorded an

1980-08-25

1987-11-17

Phillips, Charles E.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 41, G11B 1700

Patent

active

047078154

ABSTRACT:
An unrecorded portion detecting apparatus for a record player. The apparatus has a device such as light-emitting diode for applying light to disc surface and a pair of light-sensitive devices such as phototransistors for sensing light reflected by the disc surface mounted on the tone arm. The pair of light-sensitive devices are separated from each other along a tracing line of the tone arm. The apparatus further has a circuit for producing a detecting signal at the time when the tone arm detects the unrecorded portion, resulting in an output signal from the leading device of the pair of light-sensitive devices. The circuit includes means for uniforming levels of the output signals of the pair of the light-sensitive devices under the same condition, means for differentiating the uniformed signals by a predetermined extent and means for comparing level relationship between the output signals. When the tone arm traces above a boundary when a recorded portion and an unrecorded portion adjoin each other, the level states of the devices as to sensing or not sensing a predetermined level of light are reversed.

REFERENCES:
patent: 3465158 (1969-09-01), Foerster
patent: 3585399 (1968-10-01), Andrews
patent: 3783277 (1974-01-01), Younkin et al.
patent: 3959666 (1976-05-01), Fett et al.
patent: 4109114 (1978-08-01), Baer et al.
patent: 4237388 (1980-12-01), Nokubo et al.

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