Reversed galilean finder optical system

Details Reversed galilean finder optical system Reversed galilean finder optical system

1994-01-26

1996-01-09

Epps, Georgia Y.

Optical: systems and elements

Lens

Including a nonspherical surface

359744, G02B 302, G02B 1300

Patent

active

054833817

ABSTRACT:
A reversed Galilean finder optical system includes the first lens unit with a negative refracting power and the second lens unit with a positive refracting power. The second lens unit consists of a single positive lens in which the refracting power of the surface on the pupil side is higher than that of the surface on the object side. At least one surface of the positive lens is aspherical. Thus, the reversed Galilean finder optical system is constructed as the finder which has compact design and good performance.

REFERENCES:
patent: 2889745 (1959-06-01), Hayes et al.
patent: 3971052 (1976-07-01), Plummer
patent: 4650293 (1987-03-01), Kimura
patent: 4832470 (1989-05-01), Wakamiya
patent: 4834472 (1989-05-01), Palmer

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