Beam spot scanning device
AssigneeCanon Kabushiki Kaisha
InventorsKazuya Matsumoto, Isao Yamaguchi, Takao Tsuji, Hideaki Sato
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Abstract
A device for scanning a beam spot. The device has a light deflecting portion and a light condensing thin film lens formed on a thin film waveguide path. In this device, a chirped signal is applied to a surface elastic wave transducer constituting the light deflecting portion, whereby scanning of the beam spot is effected on or near the curved end surface of the thin film waveguide path. This device is very compact and capable of high-speed scanning.
Claims11
A device for reproducing information on a recorded medium comprising:
- a wave guide for propagating a light beam;
- a magnetic transfer film provided on a light exit surface of said wave guide;
- first means for deflecting said light beam in said wave guide;
- second means for concentrating the deflected light beam on or near said magnetic transfer film;
- and
- third means for detecting the light beam from said magnetic transfer film.
A device for scanning a beam spot, comprising:
- a wave guide for propagating a light beam;
- means for deflecting the light beam in said wave guide;
- and
- a thin film lens provided in said wave guide for forming the beam spot, wherein said wave guide has an exit surface substantially coincident with or along a curved locus defined by the beam spot formed by said thin film lens.
A device for scanning a beam spot and for recording a signal on a recording medium, comprising:
- a wave guide for propagating a light beam;
- means for deflecting the light beam in said wave guide;
- and
- a thin film lens provided in said wave guide for forming the beam spot, wherein said wave guide has an exit surface substantially coincident with or along a curved locus defined by the beam spot formed by said thin film lens, and the recording medium is positioned in proximity to said exit surface.
Dependencies are inferred from the claim text.