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Title:
POLARIZATION CONTROL AND ITS DEVICE
Document Type and Number:
Japanese Patent JPH04191721
Kind Code:
A
Abstract:
PURPOSE:To obtain stable control motion by increasing the amount of micro change of a second control signal three times as much as usual only in the case when micro change of a first control signal changes in the direction where the control signal is not made the optimal. CONSTITUTION:It is assumed that the change direction of phi1 to increase specified deflection component strength in a time t1 is in the direction to increase. Hereby, if DELTAphi1 is positive, phi1 increases by 10 deg. and the specified deflection component strength increases. Subsequently, if DELTAphi1 is negative, phi1 decreases by 10 deg. and the specified deflection component strength decreases. Accordingly, phi1 increases by 30 deg. by second micro change. In this way, even when the direction of first change of phi1 is wrong, phi1 comes to be the same value as in the case when it is not wrong at the second change. Consequently, it is possible to obtain stable control motion as lowering of a control speed is restrained.

Inventors:
SHIMIZU HARUHITO
Application Number:
JP32071590A
Publication Date:
July 10, 1992
Filing Date:
November 27, 1990
Export Citation:
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Assignee:
NEC CORP
International Classes:
G02B26/06; G02B26/00; (IPC1-7): G02B26/06
Domestic Patent References:
JPH0223821A1990-01-26
Attorney, Agent or Firm:
Umeo Yamauchi



 
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