Optical system and lens element for view finder

Details Optical system and lens element for view finder Optical system and lens element for view finder

1998-06-30

1999-11-09

Epps, Georgia

Optical: systems and elements

Lens

Eyepiece

359643, 359717, 359744, 359793, 396382, G02B 2500, G02B 302, G02B 904

Patent

active

059825561

ABSTRACT:
An optical system for a view finder reduced in the overall length without aggravation of the optical performance has a negative power object lens and a positive power eyepiece lens each of which has an asphrical surface at at least one side respectively. The negative power object lens having a concave object side lens surface is comprised of a rectangular-shaped solid lens base with its four corners cut away along periphery of the concave lens surface.

REFERENCES:
patent: 2234716 (1941-03-01), Wood
patent: 3240107 (1966-03-01), Prister, Jr.
patent: 4707098 (1987-11-01), Wakamiya
patent: 5327291 (1994-07-01), Baker et al.
patent: 5483381 (1996-01-01), Baba
patent: 5508848 (1996-04-01), Inoue
patent: 5587844 (1996-12-01), Ohno
patent: 5739965 (1998-04-01), Ohno

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