PURPOSE:To converge a light beam on an optical position of an optical recording medium while the optical recording medium and an optical pickup are held stationary by varying the quantity of intensity modulation by a two-dimensional optical modulator and making a laser beam scan. CONSTITUTION:The quantity of intensity modulation by the two-dimensional optical modulator is varied to make a scan. For example, when light is inhibited from traveling backward from a part except a pinhole 11 and a liquid crystal display 9, a wave front which has an amplitude distribution proportional to the Fourier transformation of the amplitude transmissivity distribution of an image and a plane wave from the pinhole 11 appear in the image focal plane of a lens 7. Here, an image is plotted on the liquid crystal display 9 and a hologram 17 is reproduced with the pinhole 11 closed, so that a spot image 23 is formed on a screen 21 on the image focal plane of a lens 19. This spot image 23 moves as the image moves, so the light beam is made to scan by moving the image. Consequently, while the optical recording medium and optical pickup are held stationary, the light beam can be made to scan, thereby eliminating the need for a high-accuracy moving mechanism.

Light beam scanning device

PURPOSE:To obtain an optical deflecting path which permits easy two-dimensional random access without having a movable part by generating the correlative intensity of a random pattern and partial pattern by coherent light and Fourier transform hologram. CONSTITUTION:The Fourier transform hologram 2 which is formed by the Fourier transform of the random pattern in order to form a beam spot having a sharp peak on a spanning plane 1 and a display element 3 which generates successively the partial patterns in the random pattern are disposed along the optical axis of an optical system. The partial pattern displayed on the element 3 is imaged onto a coherent-incoherent converting element 6 and the coherent light from a coherent light source 8 is subjected to spacial light intensity modulation according to said partial pattern and is condensed as the correlative intensity distribution of the random pattern and partial pattern on the hologram 2.

Holographic optical deflector

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Holographic optical deflector