11-04-2013 дата публикации
Номер: US20130088763A1
A laser beam generated by a laser light source is reflected by a light beam scanning device, and irradiated onto a hologram recording medium. On the hologram recording medium, an image of a scatter plate is recorded as a hologram by using reference light that converges on a scanning origin. The light beam scanning device bends the laser beam at the scanning origin and irradiates it onto the hologram recording medium. At this time, scanning is carried out by changing the bending mode of the laser beam with time so that the irradiation position of the bent laser beam on the hologram recording medium changes with time. Regardless of the beam irradiation position, diffracted light from the hologram recording medium reproduces the same reproduction image of the scatter plate at the same position. An illumination spot in which speckles are reduced is formed on the light receiving surface of an illuminating object by the reproduction image of the hologram. 1. An illumination apparatus using a coherent light source , comprising:{'b': 50', '50, 'a coherent light source () that generates a coherent light beam (L);'}{'b': 45', '46', '85', '35', '30, 'a hologram recording medium (, , ) on which an image () of a scatter plate () is recorded; and'}{'b': 60', '65', '60', '65', '45', '46', '85', '60', '65', '60', '65', '45', '46', '85, 'a light beam scanning device (, ) that irradiates the light beam (L, L) onto the hologram recording medium (, , ), and scans the light beam (L, L) so that an irradiation position of the light beam (L, L) on the hologram recording medium (, , ) changes with time, wherein'}{'b': 30', '45', '46', '85', '23, 'the image of the scatter plate () is recorded as a hologram on the hologram recording medium (, , ) by using reference light (L, Lref) irradiated along an optical path,'}{'b': 50', '50', '35, 'the coherent light source () generates a light beam (L) with a wavelength capable of reproducing the image () of the scatter plate,'}{'b': 60', '65', '60', ' ...
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