Television – Camera – system and detail – Optics
Reexamination Certificate
2011-04-26
2011-04-26
Henn, Timothy J (Department: 2622)
Television
Camera, system and detail
Optics
C359S888000, C359S889000
Reexamination Certificate
active
07932952
ABSTRACT:
An optical performance is deteriorated by a minute phase difference of transmission wave front of an ND filter. In a light quantity adjusting device which includes an ND filter (P1) for attenuating a quantity of light passing through an aperture formed by diaphragm blades (S11and S12) and in which a cover ratio of the aperture by the ND filter (P1) is changed, setting is conducted such that a phase difference between lights with a predetermined wavelength λ which pass through regions (N11,N12,and N13) of the ND filter (P1) with different transmittances inside the aperture becomes substantially 0λ, substantially 1λ, or substantially 2λ in a state in which the aperture is completely covered with the ND filter (P1).
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Koyama Takeshi
Murata Yasunori
Canon Kabushiki Kaisha
Henn Timothy J
Rossi Kimms & McDowell LLP
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