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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CXD3003R датащи(PDF) 105 Page - Sony Corporation |
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CXD3003R датащи(HTML) 105 Page - Sony Corporation |
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105 / 137 page  – 105 – CXD3003R §5-12. Brake Circuit Immediately after a long distance track jump it tends to be hard for the actuator to settle and for the servo to turn on. The brake circuit prevents these phenomenon. The brake circuit is to use tracking drive as a brake by cutting unnecessary portions of it utilizing the 180° offset in the RF envelope and tracking error phase relationship which occurs when the actuator traverses the track in the radial direction from the inner track to the outer track and vice versa. (See Figs. 5-15 and 5-16.) Concretely, this operation is achieved by masking the tracking drive using the TRKCNCL signal generated by loading the MIRR signal at the edge of the TZC (Tracking Zero Cross) signal. The brake circuit can be turned on and off by D18 of $1. (See Fig. 5-17.) TRK DRV FWD JMP REV JMP Servo ON RF Trace MIRR TE 0 0 TZC Edge TRKCNCL TRK DRV SENS TZC out Inner track Outer track TRK DRV REV JMP FWD JMP Servo ON RF Trace MIRR TE 0 0 TZC Edge TRKCNCL TRK DRV SENS TZC out Outer track Inner track Fig. 5-15. Fig. 5-16. D23 to D20 D19 to D16 1 0 ∗ ∗ 0 ∗ ∗ ∗ ∗ 1 ∗ ∗ ∗ 0 ∗ ∗ ∗ ∗ 0 ∗ ∗ ∗ 1 ∗ ∗ ∗ ∗ 1 ∗ ∗ ∗ 0 ANTI SHOCK ON ANTI SHOCK OFF BRAKE ON BRAKE OFF TRACKING GAIN NORMAL TRACKING GAIN UP TRACKING GAIN UP FILTER SELECT 1 TRACKING GAIN UP FILTER SELECT 2 0 0 0 1 TRACKING CONTROL 1 Fig. 5-17. ∗: Don’t care Register name Command |
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