Title:
MIDDLE MAGNIFICATION OBJECTIVE LENS
Document Type and Number:
Japanese Patent JPS52146649
Kind Code:
A
Abstract:
PURPOSE: To obtain inexpensive middle magification lenses suitable for reproduction systems of video discs by so composing five pieces of lenses from 1st lens to fifth lens so as to satisfy certain condition formulas.
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Inventors:
KOIZUMI TOSHIMICHI
Application Number:
JP6325076A
Publication Date:
December 06, 1977
Filing Date:
May 31, 1976
Export Citation:
Assignee:
OLYMPUS OPTICAL CO
International Classes:
G02B13/00; G02B9/60; G02B21/02; (IPC1-7): G02B9/60; G02B21/02