FREQUENCY SHIFTER AND OPTICAL DISPLACEMENT MEASURING APPARATUS

Title:

FREQUENCY SHIFTER AND OPTICAL DISPLACEMENT MEASURING APPARATUS

Document Type and Number:

Japanese Patent JP3486479

Kind Code:

B2

Abstract:

PURPOSE: To drive a frequency shifter using an electro-optical element stably and at a precise waveform.
CONSTITUTION: In a frequency shifter, a voltage is applied to an electro-optical element and the phase of a luminous flux which is incident on the electro-optical element is modulated. The frequency shifter is provided with a constant-current circuit 20A by which a circuit applying a driving voltage to the electro-optical element supplies a constant current and with a discharge circuit 20B in which a switching element Q3 is constituted of an FET transistor. The voltage of a switching signal by the switching element Q3 is set nearly at the IQ point of the FET transistor.

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Inventors:

Shujiro Kadowaki
Makoto Takamiya
Naruki Kato

Application Number:

JP11456395A

Publication Date:

January 13, 2004

Filing Date:

May 12, 1995

Export Citation:

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Assignee:

Canon Inc

International Classes:

G01P3/36; G01B11/00; G01P5/00; G01S17/58; G02F2/02; (IPC1-7): G01P3/36; G01B11/00; G01P5/00; G01S17/58; G02F2/02

Domestic Patent References:

JP6391607A
JP4181785A
JP8285875A
JP669941U

Attorney, Agent or Firm:

Keizo Nishiyama (1 person outside)

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