Gauss type near focus lens

Details Gauss type near focus lens Gauss type near focus lens

1988-06-14

1989-03-14

Corbin, John K.

350464, G02B 964, G02B 962

Patent

active

048120278

ABSTRACT:
A Gauss type rear focus lens includes a forward group having, in succession from the object side, a first lens component having its convex surface facing the object side and having a positive refractive power, a second lens component comprised of at least one lens and having a positive refractive power, and a third lens component having its sharply concave surface facing the image side and having a negative refractive power, the forward group having a positive refractive power as a whole, and a rearward group disposed on the image side relative to the forward group, the rearward group having a fourth lens having its sharply concave surface facing the object side and having a negative refractive power, a fifth lens having its sharply convex surface facing the image side and having a positive refractive power, and a sixth lens having a positive refractive power, the rearward group having a positive refractive power. During the focusing from infinity to a short distance, the rearward group is moved along the optic axis.

REFERENCES:
patent: 4392724 (1983-07-01), Hamanishi
patent: 4466711 (1984-08-01), Yokota
patent: 4553823 (1985-11-01), Kato et al.

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