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4. Focus servo The focus error signal is derived by detecting the difference between (A + C) and (B + D), which is (B + D) - (A + C), and is then output from FE (pin 20). The focus error signal gain is set by the resistance between FE (pin 20) and FE- (pin 21). The FA amplifier is the pickup phase compensation amplifier, and the equalizer curve is set by the extemal capacitor and resistance. Furthermore, this amplifier has a mute function which is applied when Vcc is turned on, when the F-SERVO OFF command is sent, and during F-SEARCH. In order to tum the focus servo on, send either the LASER ON command or the F-SERVO ON command. The FD amplifier has a phase compensation circuit, a focus search signal composition function, and an offset cancellation function. Focus search is initiated by the F-SEARCH command, and a ramp waveform is generated by the internal clock. This waveform is used for focus detection (focus zero cross) with the focus error signal and then tum the focus servo on. The ramp waveform amplitude is set by the resistance between FD (pin 16) and FD- (pin 17). Offset cancellation cancels the IC offset; adjustment is started by the FOCUS-OFFSET ADJUST START command, and is completed in about 250 ms. To cancel even the offset for the IV amplifier, etc., it is necessary to send the F-SERVO ON (LASER OFF) command. The FOCUS-OFFSET ADJUST OFF command is used to retum to the state prior to offset cancellation. For the LA9231M, FCS (pin 46) is for smoothing the focus search ramp waveforms, and a capacitor is connected between FSC and VR.
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