Objective lens having a filter

Details Objective lens having a filter Objective lens having a filter

1993-01-08

1993-10-05

Henry, Jon W.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359637, 359723, 359888, 359891, 358 55, G02B 522, G02B 2714, H04N 9097

Patent

active

052510689

ABSTRACT:
This specification discloses an objective lens disposed forwardly of a prism block for dividing light into a plurality of color components, the objective lens having an optical filter differing in spectral transmission factor between the central area thereof and the marginal areas thereof, this filter being given the characteristic that one of the marginal areas transmits much of magenta light therethrough and the other marginal area transmits much of green light therethrough, thereby suppressing the coloring of a blurred image based on the light incidence angle dependency of the color dividing surface of the prism block.

REFERENCES:
patent: 3534159 (1970-10-01), Eilenberger
patent: 4589015 (1986-05-01), Nakata et al.
patent: 4964696 (1990-10-01), Suzuki et al.
patent: 5002347 (1991-03-01), Anderson et al.

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