| 摘要 |
PURPOSE:To obtain an accurate holography image correctly synchronizing with a vibration mode by synchronizing with the vibration of a subject to control the radiation timing of laser beams. CONSTITUTION:In a holography pickup device 10, when a laser light source 11 is driven, the object illuminating light A of the beams from the laser light source 11 is radiated upon a subject 20 and the reflected ray thereof reaches a recording medium 14, while the reference light B is radiated to the recording medium 14 to record an interference stripe on the medium 14. A frequency detector 25 generates one time of electric signals a at every rotation of a timing gear axis of rotation, while the other rotation detector 26 generates plural times of electric signals b to put the signals a and b into a control unit 20. The electric signals a and b are given to the reset input R and the clock input CL of a counter 45 through the corrugated shaping circuits 43 and 44 while the output thereof is added to the input of one side of an OR circuit 48 through the variable delay circuits 46 and 47. To the other input of the circuit 48 the output of the delay circuit 46 is given, while the output thereof is put out from a terminal 49 to the timing signals c controlling the laser radiation pulses. |
