| 摘要 |
PROBLEM TO BE SOLVED: To provide a hologram substrate in which an irradiating laser beam can be efficiently used for projecting a reproduced image, and to provide a method for manufacturing a hologram substrate for efficiently manufacturing the above hologram substrate, and an image projector. SOLUTION: The hologram substrate 1 functions to form an image by irradiation with a laser beam and has a hologram pattern 11 that is formed on an opposite face to the face to be irradiated with a laser beam and diffracts the laser beam to project an image of an optional shape, and a great number of minute protrusions and recesses 12 formed on the face to be irradiated with a laser beam. The average pitch of adjacent protrusions in the protrusions and recesses 12, the width of the protrusions and recesses 12, and a height difference of the protrusions and recesses are 30 to 50% of the wavelength of the laser beam. COPYRIGHT: (C)2008,JPO&INPIT
|
