Optical: systems and elements – Lens – Multiple component lenses
Patent
1994-02-28
1995-12-12
Epps, Georgia Y.
Optical: systems and elements
Lens
Multiple component lenses
359795, 359717, 359368, G02B 906
Patent
active
054755379
ABSTRACT:
An optical system for recording and reading information on an optical information medium such as a video disk, a mini disk, a magneto-optical disk, and a phase change disk. The optical system includes: a light source for irradiating the optical information medium with a light beam through a coupling lens and a objective lens; the coupling lens which is a spherical single lens; and the objective lens which is a double-sided aspherical lens and provided movable along an optical axis of the light source; in which the light source is located between the coupling lens and a focal point, at a side of the light source, of the coupling lens. The optical system defines the number of a numerical aperture on the side of the optical information medium, and a lateral magnification ratio of the optical system.
REFERENCES:
patent: 4525040 (1985-06-01), Nakamura
English language abstract of Japanese Patent Publication Open to Public Inspection No. 76512/1982.
English language abstract of Japanese Patent Publication Open to Public Inspection No. 56314/1986.
English language abstract of Japanese Patent Publication Open to Public Inspection No. 43842/1987.
Arai Norikazu
Kobayashi Masaya
Kushida Kaoru
Epps Georgia Y.
Konica Corporation
Robbins Thomas D.
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