Low profile optical pickup unit for recording/reproducing device

Details Low profile optical pickup unit for recording/reproducing device Low profile optical pickup unit for recording/reproducing device

1995-07-17

1997-01-07

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, 369120, G11B 700

Patent

active

055924603

ABSTRACT:
A light emitting unit emits light beams in a direction downwardly oblique from a horizontal direction and a stand-up mirror reflects the light beams so as to deflect them upward. An objective lens converges deflected light beams onto an information recording medium. A lens holder holds the objective lens, and an aperture stop is provided in the lens holder to limit light beams which are then incident on the objective lens. The aperture stop is located higher than a projecting end of a bottom convex surface of the objective lens. A top end of the light emitting unit is located higher than a projecting end of a top convex surface of the objective lens. The lens holder has a shape such that the lens holder may not enter a light path along which the light beams emitted by the light emitting unit and then incident on the stand-up mirror pass. A portion, of the stand-up mirror, which extends lower than a bottom end of mirror surface of the stand-up mirror may be removed from the stand-up mirror.

REFERENCES:
patent: 5005162 (1991-04-01), Mitsumori et al.
patent: 5223970 (1993-06-01), Oono et al.
patent: 5237557 (1993-08-01), Kasahara et al.
patent: 5283771 (1994-02-01), Kadowaki et al.

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