Projection type image display apparatus

摘要

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 the laser beam onto the hologram recording medium. At this time, scanning is carried out by changing a bending mode of the laser beam with time so that an irradiation position of the bent laser beam on the hologram recording medium changes with time. Regardless of an irradiation position of the beam, diffracted light from the hologram recording medium produces a reproduction image of the scatter plate on the spatial light modulator. The modulated image of the spatial light modulator is projected onto a screen.