US4933710A — Filter apparatus use in a photographic printer

Claim 1

Independent Claim 222 words

In a photographic printer, apparatus comprising: means for holding a photographic negative; a single light sensor; a rotatable disc having a disc center and being disposed between said photographic negative and said light sensor; said rotatable disc having first, second and third angularly=displaced, equal sized apertures located at the same radial distance from said center and respectively supporting red, green, and blue large area transmissive filters; said rotatable disc further having first, second and third angularly-displaced, spirally disposed rows of a like number of equal sized apertures, the apertures in each row being located at different radial distances from said center with the corresponding apertures of different rows being located at the same radial distance from said center, and respectively supporting red, green, and blue scanning filters over said rows of apertures; the apertures over which said transmissive filters are supported being relatively larger than the apertures of said rows over which said scanning filters are supported; means including at least one optical lens disposed intermediate said rotatable disc and said light sensor for focusing light projected through said photographic negative and any selected one of the apertures of said large area transmissive or scanning filters onto said light sensor; and means for determining the position of the filters on said rotatable disc relative to said photographic negative and said light sensor.

Claim 2

Dependent Claim 222 words

In a photographic printer, apparatus comprising: means for holding a photographic negative; a single light sensor; a rotatable disc having a disc center and being disposed between said photographic negative and said light sensor; said rotatable disc having first, second and third angularly=displaced, equal sized apertures located at the same radial distance from said center and respectively supporting red, green, and blue large area transmissive filters; said rotatable disc further having first, second and third angularly-displaced, spirally disposed rows of a like number of equal sized apertures, the apertures in each row being located at different radial distances from said center with the corresponding apertures of different rows being located at the same radial distance from said center, and respectively supporting red, green, and blue scanning filters over said rows of apertures; the apertures over which said transmissive filters are supported being relatively larger than the apertures of said rows over which said scanning filters are supported; means including at least one optical lens disposed intermediate said rotatable disc and said light sensor for focusing light projected through said photographic negative and any selected one of the apertures of said large area transmissive or scanning filters onto said light sensor; and means for determining the position of the filters on said rotatable disc relative to said photographic negative and said light sensor.

Claim 3

Dependent Claim 48 words

The apparatus of claim 1 wherein: said photographic negative is disposed in a plane generally perpendicular to and centered on an optical axis; said light sensor is disposed generally on said optical axis; and said rotatable disc is disposed in a plane generally perpendicular to said optical axis.

Claim 4

Dependent Claim 77 words

The apparatus of claim 2 and further including means for rotating said rotatable disc; and wherein said position determining means comprises: said disc further including a plurality of indices disposed about the periphery thereof; means disposed proximate said rotatable disc for sensing said indices as said disc is rotated; and means connected to said sensing means for determining the position of said scanning and large area filters relative to said light sensor as said rotatable disc rotates.

Claim 5

Dependent Claim 158 words

In a scanning filter disc of the Nipkow type, having a rotatable disc supporting three spirally disposed rows of scanning filters including a set of red scanning filters, a set of blue scanning filters and a set of green scanning filters, each set of filters including a plurality of apertures overlain by an appropriately colored filter, and the disc including a plurality of timing marks and a starting mark disposed about the periphery of said disc and used to determine the relative positions of the various apertures on the scanning disc with respect to an optical axis, the improvement comprising said scanning disc further supporting red, blue and green large area transmissive filters, each including an aperture relatively larger than said scanning filter apertures and overlain by an appropriately colored filter, the large area transmissive filters being positioned relative to said timing marks and starting mark so that their positions relative to said optical axis can be determined.

Claim 6

Dependent Claim 158 words

In a scanning filter disc of the Nipkow type, having a rotatable disc supporting three spirally disposed rows of scanning filters including a set of red scanning filters, a set of blue scanning filters and a set of green scanning filters, each set of filters including a plurality of apertures overlain by an appropriately colored filter, and the disc including a plurality of timing marks and a starting mark disposed about the periphery of said disc and used to determine the relative positions of the various apertures on the scanning disc with respect to an optical axis, the improvement comprising said scanning disc further supporting red, blue and green large area transmissive filters, each including an aperture relatively larger than said scanning filter apertures and overlain by an appropriately colored filter, the large area transmissive filters being positioned relative to said timing marks and starting mark so that their positions relative to said optical axis can be determined.

Claim 7

Dependent Claim 26 words

The apparatus of claim 1, wherein at least one of said large area transmissive filters is of a different bandwidth than the corresponding like-colored scanning filter.

Claim 8

Dependent Claim 21 words

The apparatus of claim 1, wherein said large area transmissive filters are of different bandwidths than the corresponding like-colored scanning filters.

Claim 9

Dependent Claim 25 words

The improvement of claim 4, wherein at least one of said large area transmissive filters has a bandwidth narrower than the corresponding like-colored scanning filter.

Claim 10

Dependent Claim 21 words

The improvement of claim 4, wherein said large area transmissive filters are of narrower bandwidths than the corresponding like-colored scanning filters.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-06-11	1993-12-11	1994-06-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-06-11	1997-12-11	1998-06-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-06-11	2001-12-11	2002-06-12	$7700.00	Window Closed / Lapsed

Filter apparatus use in a photographic printer

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