Fitzpatrick, Cella, Harper & Scinto
Doppler velocity meter
 A Doppler velocity meter has a radiation source for emitting a radiation beam the wavelength of which fluctuates, such as a laser; an optical system for directing the radiation beam to an object at an incident angle .theta. and a detector for detecting scattered beam generated from the object by directing the radiation beam. The optical system has a diffraction grating which serves to change the incident angle .theta. in accordance with a change in the wavelength .lambda. of the radiation beam in such a manner as to maintain the value of sin .theta./.lambda. substantially constant. The velocity meter can accurately detect the velocity of movement of the object regardless of any change in the wavelength .lambda., because the diffraction grating serves to substantially compensate for any change in the frequency of the scattered beam caused by the change in the wavelength. 
Canon Kabushiki Kaisha
B G B B G
B41J G01S B41J B41J G01S
additional inventional additional inventional inventional
Kosuke Makoto Masafumi Yasuhiko Haruhiko Ken Hidejiro Toshiyuki Hiroshi
Yamamoto Takamiya Wataya Ishida Takahashi Tsuchii Kadowaki Yanaka Sugiyama