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Optical Systems

Separation-type-optical-head

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Method for determining rheumatoid factors and agents for carrying out the method

The invention claimed is: 1. A process for preparing a diagnostic reagent for Rheumatoid Factor ...

Reverse light blocking hologram for a center high mounted stoplight

OF THE DISCLOSURE In the following detailed description and in the several figures of the drawing, ...

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Separation type optical head

Details

Inventors: Kamisada, Toshimasa;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Envall, Jr.; Roy N.
Assistant Examiner: Bui; Hung
Attorney, Agent or Firm: Fay, Sharpe, Beall, Fagan, Minnich & McKee

An optical recording/reproducing apparatus for recording and reproducing an information through irradiating a light beam on a recording medium has a separation type construction including a stationary section and a movable section which is movable across recording tracks on the recording medium. The stationary section includes a light source and detectors for detecting data signal and servo control signal from the light beam reflected by the recording medium, while the movable section includes a mirror for reflecting the light beam from the light source to allow the light beam to impinge upon the recording medium perpendicularly thereto, and a lens for converging the light reflected by the mirror onto the recording medium. The mirror and the lens are disposed such that a distance between the mirror and the principal point of the lens is substantially twice as large as the focal length of the lens.

DETAILED DESCRIPTION Accordingly, an object of the present invention is to provide a separation type optical head in which divergence of light due to tilting of the movable section is eliminated to reduce any offset of the servo tracking signal.
To this end, according to the present invention, there is provided a separation type optical head in which the distance between the mirror of the movable section and the principal point of an objective lens is set to be about twice as large as the focal length of the objective lens.

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