| 摘要 |
<P>PROBLEM TO BE SOLVED: To keep the area of irradiation of a hologram recording material with reference light to be always constant without inducing mechanical abrasion irrespectively of the variation in the incidence angle of the reference light at the time of recording a hologram by an angle multiplex recording system without degrading a high scanning speed and a small-size lightweight configuration. <P>SOLUTION: If a diffraction grating 111 and a hologram recording material 14 are disposed in an imaging relationship through a telecentric optical system comprising lenses 12, 13, this ensures that, even when the deflection angle of the reference light 200 is varied by the diffraction grating 111 to thereby vary the angle of incidence on the hologram recording material 14, the area of irradiation of the hologram recording material with the reference light 200 can be kept constant because of the imaging relationship of the diffraction grating 111 and the hologram recording material 14. This effect can be realized without inducing any mechanical abrasion and without degrading a high scanning speed and a small-size lightweight configuration. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
