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b) Brake Circuit

The servo retracting performance can be deteriorate

during the setup or track jump operation. In this con-

nection, the brake circuit is used to ensure steady

retract of the tracking servo. The brake circuit detects in

which direction the lens is moving, then slows down its

move by outputting the drive signal that moves the

lens into the opposite direction alone. Track slippage

direction is determined by referencing the TEC and

MIRR signals and their phase.

TEC

TZC

(TEC "SQUARED UP" )

(INTERNAL SIGNAL )

MIRR

MIRR LATCHED AT

TZC EDGES

SWITCHING PULSE

EQUALIZER OUTPUT

(SWITCHED)

DRIVE DIRECTION

LENS MOVING FORWARDS

(INNER TRACK TO OUTER)

REVERSE

Note : Equalizer output assumed to hava same phase as TEC.

Fig.15 : TRACKING BRAKE CIRCUIT

LENS MOVING BACKWARDS

FORWARD

Time

YPM-2306ZF