Apparatus for optically reading information

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

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359 17, 359212, 359216, G02B 532

Patent

active

051895331

ABSTRACT:
An optical information reading apparatus for optically reading information recorded on a recording medium with a laser light beam emitted from a light source. The apparatus comprises a hologram device for receiving at its center portion a laser light beam. The hologram diffracts the received light so as to produce a first diffracted light beam and is arranged to receive at its entire surface light to be reflected from the recording medium and to diffract the received light so as to produce a second diffracted light beam. This hologram device is arranged to be driven by a motor so as to move the first diffracted light beam for a scanning operation. Also included in the reading apparatus is a reflection assembly for reflecting the first diffracted light beam from the hologram device toward the recording medium and further for reflecting light reflected from the recording medium toward substantially the entire surface of the hologram device whereby the hologram device produces the second diffracted light beam. The second diffracted light beam is directed to a light-receiving device which in turn performs a photoelectric conversion in accordance with the intensity of the received light beam to read the information recorded on the recording medium. This arrangement allows the size-reduction of the apparatus concurrently with accurately reading out the information.

REFERENCES:
patent: 4415224 (1983-04-01), Dickson
patent: 4639070 (1987-01-01), Ikeda et al.
patent: 4655541 (1987-04-01), Yamazaki et al.
patent: 4971410 (1990-11-01), Wike, Jr. et al.

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