| 摘要 |
The circuit includes a beam detector unit(10) for detecting beam reflected by a disk, a switch having a common terminal(c) connected to output terminal of a comparator(50), a first terminal(a) connected to an input terminal of an amplifier(OP2), and a second terminal(b) connected to a ground, and a switch controller(100) for connecting the common terminal of the switch to the first terminal(a) when output signal of an adder(30) is less than a reference level, and otherwise for connecting the common terminal of the switch to the second terminal(b).
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