Hitachi Cable, Inc.

Hitachi, Ltd.

Makoto Horie

Shigeru Nakamura

Masahiro Ojima

Hitoshi Suzuki

Hirobumi Ouchi

Hideyuki Takashima

Tomoyuki Hakuta

In a multiple optical waveguide device, a transparent plate is bonded or joined on the top surface of a clad with which optical circuits and quartz glass substrates are covered, and optical reflection film is provided on the fringing area or the whole area of a joint surface of the transparent plate with the clad. Optical circuits or waveguide patterns can be recognized easily by visual inspection.

Optical waveguide device and multiple optical waveguide device

An optical fiber type magneto-optical head is capable of realizing satisfactory reductions in size and weight of a movable portion of an optical head. An extinction-type form of the optical fiber type magneto-optical head comprises a first optical device for condensing a polarized light beam and leading the light beam into a polarization-maintaining optical fiber, a second optical device for focusing light emerging from the optical fiber into a beam spot on a magnetic recording medium, a detector for detecting via the optical fiber light reflected from the magnetic recording medium with a change in polarized state, and an azimuth rotator disposed between the second optical device and the optical fiber, wherein the azimuth rotator is designed so that the angle of optical rotation upon one pass therethrough is

Magneto-optical head employing optical fiber connected stationary and

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Hitachi, Japan

Makoto Horie