Color pick-up device

Claim 2

A color pick-up device comprising: an objective lens located in the path of image-forming light rays transmitted from an object, a first dichroic mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said first mirror having a thickness t1and provided with a reflective film on the surface opposite to the ray receiving surface thereof, said first dichroic mirror having a refractive index n1and making an angle u1 with the optical axis of the device, a second dichroic mirror located in the patH of image-forming rays transmitted through said dichroic mirror for reflecting a second portion of the image-forming rays transmitted through said first mirror, said second dichroic mirror having a thickness t2and provided with a reflective film on the ray receiving surface thereof, said second dichroic mirror having a refractive index n2and making an angle u2 with the optical axis, the angles u1 and u2 being displaced 90* about the optical axis from each other, a first pick-up tube for receiving said first portion of the image-forming rays reflected by said first dichroic mirror, said first pick-up tube having its target plane located at the focus of a sagittal component of the reflected first ray portion, thereby obtaining a vertically decreased resolution of said first reflected ray portion, a second pick-up tube for receiving said second portion of the image-forming rays reflected by said second dichroic mirror, said first pick-up tube having its target plane located at the focus of a sagittal component of the reflected second ray portion, thereby obtaining a vertically decreased resolution of said second reflected ray portion, and a third pick-up tube located in the path of the image-forming rays transmitted through said first and second dichroic mirrors, the thicknesses and the refractive indices of said mirrors together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 - 1) sin2 u1/(n12 - sin2 u1)3/2 about t2 (n22 - 1) sin2 u2/(n22 - sin2 u2)3/2 thereby obtaining a third image-forming ray portion having a resolution decreased neither vertically or horizontally.

Claim 3

A color pick-up device according to claim 1, wherein said first ray portion lies in the red frequency spectrum, said second ray portion lies in the blue frequency spectrum, and said third ray portion lies in the green frequency spectrum.

Claim 4

A color pick-up device according to claim 1, wherein said first ray portion lies in the blue frequency spectrum, said second ray portion lies in the red frequency spectrum, and said third ray portion lies in the green frequency spectrum.

Claim 5

A color pick-up device comprising: an objective lens located in the path of image-forming light rays transmitted from an object, a first dichroic mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said first mirror having a thickness t1and provided with a reflective film on the light ray receiving surface thereof, said first dichroic mirror having a refractive index n1and making an angle u1 with the optical axis of the device, a second dichroic mirror for receiving located in the path of image-forming rays transmitted through said first dichroic mirror and for reflecting a second portion of the image-forming rays transmitted through said first mirror, said second dichroic mirror having a thickness t2and provided with a reflective film on the light ray receiving surface thereof, said second dichroic mirror having a refractive index n2and making an angle u2 with the optical axis, the angles u1 and u2 being displaced 90* about the optical axis from each other, a first pick-up tube for receiving said first portion of the image-forming rays reflected by said first dichroic mirror, said fist pick-up tube receiving said first image-forming rays free of astigmatism, a second pick-up tube for receiving said second portion of the image-forming rays reflected by said second dichroic mirror, said second pick-up tube having its target plane located at the focus of a sagittaL component of the reflected second ray portion, thereby obtaining a vertically decreased resolution of said second reflected ray portion, and a third pick-up tube located in the path of a third image-forming ray portion transmitted through said first and second dichroic mirrors, said third pick-up tube having its target plane located at the focus of a sagittal component of the third image-forming ray portion, thereby obtaining vertically decreased resolution of said third image-forming ray portion, the thicknesses and the refractive indices of said mirrors together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 - 1) sin2 u1/(n12 - sin2 u1)3/2 not = t2(n22 - 1) sin2 u2/(n22 - sin2 u2)3/2.

Claim 6

A color pick-up device comprising: an objective lens located in the path of image-forming light rays transmitted from an object, a first dichroic mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said first mirror having a thickness t1and provided with a reflective film on the light ray receiving surface thereof, said first dichroic mirror having a refractive index n1and making an angle u1 with the optical axis of the device, a second dichroic mirror for receiving located in the path of image-forming rays transmitted through said first dichroic mirror and for reflecting a second portion of the image-forming rays transmitted through said first mirror, said second dichroic mirror having a thickness t2and provided with a reflective film on the light ray receiving surface thereof, said second dichroic mirror having a refractive index n2and making an angle u2 with the optical axis, the angles u1 and u2 being displaced 90* about the optical axis from each other, a first pick-up tube for receiving said first portion of the image-forming rays reflected by said first dichroic mirror, said fist pick-up tube receiving said first image-forming rays free of astigmatism, a second pick-up tube for receiving said second portion of the image-forming rays reflected by said second dichroic mirror, said second pick-up tube having its target plane located at the focus of a sagittaL component of the reflected second ray portion, thereby obtaining a vertically decreased resolution of said second reflected ray portion, and a third pick-up tube located in the path of a third image-forming ray portion transmitted through said first and second dichroic mirrors, said third pick-up tube having its target plane located at the focus of a sagittal component of the third image-forming ray portion, thereby obtaining vertically decreased resolution of said third image-forming ray portion, the thicknesses and the refractive indices of said mirrors together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 - 1) sin2 u1/(n12 - sin2 u1)3/2 not = t2(n22 - 1) sin2 u2/(n22 - sin2 u2)3/2.

Claim 7

A color pick-up device according to claim 4, wherein said first ray portion lies in the green frequency spectrum, said second ray portion lies in the blue frequency spectrum, and said third ray portion lies in the red frequency spectrum.

Claim 8

A color pick-up device according to claim 4, wherein said first ray portion lies in the green frequency spectrum, said second ray portion lies in the red frequency spectrum, and said third ray portion lies in the blue frequency spectrum.

Claim 9

A color pick-up device according to claim 4, wherein the reflective film on the surface of said first dichroic mirror comprises a light interference filter having relative luminous efficiency characteristics, and wherein said second ray portion lies in the blue frequency spectrum, and said third ray portion lies in the red frequency spectrum.

Claim 10

A color pick-up device according to claim 4, wherein the reflective film on the surface of said first dichroic mirror comprises a light interference filter having relative luminous efficiency characteristics, and wherein said second ray portion lies in the red frequency spectrum, and said third ray portion lies in the red frequency spectrum.

Claim 11

A color pick-up device comprising: an objective lens located in the path of image-forming rays transmitted from an object, a first dichroic mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said first mirror having a thickness t1and provided with a reflective film on the light ray receiving surface thereof, said first dichroic mirror having a refractive index n1and making an angle u1with the optical axis of the device, a second dichroic mirror located in the path of image-forming rays transmitted through said first dichroic mirror for reflecting a second portion of the image-forming rays transmitted through said first mirror, said second dichroic mirror having a thickness t2and provided with a reflective film on the light ray receiving surface thereof, said second dichroic mirror having a refractive index n2making an angle u2 with the optical axis, the angles u1 and u2 being displaced 90* about the optical axis from each other, a planoparallel glass plate located in the path of said first image-forming ray portion reflected by said first dichroic mirror, a first pick-up tube for receiving the first image-forming ray portion reflected by said first dichroic mirror and transmitted through said glass plate, said first pick-up tube having its target plane located at the focus of a sagittal component of the first reflected image-forming ray portion, thereby obtaining a vertically decreased resolution of said first reflected ray portion, a second pick-up tube for receiving the second image-forming ray portion reflected by said second dichroic mirror, said second pick-up tube having its target plane located at the focus of a sagittal component of the second reflected image-forming ray portion, thereby obtaining a vertically decreased resolution of said second reflected ray portion, and a third pick-up tube located in the path of the image-forming rays transmitted through said first and second dichroic mirrors, the thicknesses and the refractive indices of said first and second dichroic mirrors together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 -1) sin2 u1/(n12 - sin2 u1)3/2 about t2 (n22 - 1) sin2 u2/(n22 - sin2 u2)3/2 thereby obtaining a third image-forming ray portion having a resolution decreased neither vertically or horizontally.

Claim 12

A color pick-up device comprising: an objective lens located in the path of image-forming rays transmitted from an object, a first dichroic mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said first mirror having a thickness t1and provided with a reflective film on the light ray receiving surface thereof, said first dichroic mirror having a refractive index n1and making an angle u1with the optical axis of the device, a second dichroic mirror located in the path of image-forming rays transmitted through said first dichroic mirror for reflecting a second portion of the image-forming rays transmitted through said first mirror, said second dichroic mirror having a thickness t2and provided with a reflective film on the light ray receiving surface thereof, said second dichroic mirror having a refractive index n2making an angle u2 with the optical axis, the angles u1 and u2 being displaced 90* about the optical axis from each other, a planoparallel glass plate located in the path of said first image-forming ray portion reflected by said first dichroic mirror, a first pick-up tube for receiving the first image-forming ray portion reflected by said first dichroic mirror and transmitted through said glass plate, said first pick-up tube having its target plane located at the focus of a sagittal component of the first reflected image-forming ray portion, thereby obtaining a vertically decreased resolution of said first reflected ray portion, a second pick-up tube for receiving the second image-forming ray portion reflected by said second dichroic mirror, said second pick-up tube having its target plane located at the focus of a sagittal component of the second reflected image-forming ray portion, thereby obtaining a vertically decreased resolution of said second reflected ray portion, and a third pick-up tube located in the path of the image-forming rays transmitted through said first and second dichroic mirrors, the thicknesses and the refractive indices of said first and second dichroic mirrors together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 -1) sin2 u1/(n12 - sin2 u1)3/2 about t2 (n22 - 1) sin2 u2/(n22 - sin2 u2)3/2 thereby obtaining a third image-forming ray portion having a resolution decreased neither vertically or horizontally.

Claim 13

A color pick-up device according to claim 9, wherein said first ray portion lies in the red frequency spectrum, said second ray portion lies in the blue frequency spectrum, and said third ray portion lies in the green frequency spectrum.

Claim 14

A color pick-up device according to claim 9, wherein said first portion lies in the blue frequency spectrum, said second ray portion lies in the red frequency spectrum, and said third ray portion lies in the green frequency spectrum.

Claim 15

A color pick-up device wherein the input signal is a YRGB signal, comprising: an objective lens located in the path of image-forming rays transmitted from an object, a first dichroic mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said first mirror having a thickness t1and provided with a reflective film on the light ray receiving surface thereof, said first dichroic mirror having a refractive index n1and making an angle u1 with the optical axis of the device, a second dichroic mirror located in the path of image-forming rays transmitted through said first dichroic mirror for reflecting a second portion of the image-forming rays transmitted through said first mirror, said second dichroic mirror having a thickness t2and provided with a reflective film on the surface opposite to the light ray receiving surface thereof, said second dichroic mirror having a refractive index n2and making an angle u2 with the optical axis, a half mirror located between said lens and said first mirror in the path of said image-forming rays and having a thickness t3 and a refractive index n3and making an angle u3 with the optical axis, the angles u2 and u3 being displaced 90* about the optical axis relative to the angle u1 a first pick-up tube for receiving said first portion of the image-forming rays reflected by said first dichroic mirror, said first pick-up tube having its traget plane located at the focus of a sagittal component of the first reflected image-forming ray portion, thereby obtaining a vertically decreased resolution of said first reflected ray portion, a second pick-up tube for receiving said second portion of the image-forming rays reflected by said second dichroic mirror, said second pick-up tube having its target plane located at the focus of a sagittal component of the second reflected image-forming ray portion, thereby obtaining a vertically decreased resolution of said second image-forming ray portion, a third pick-up tube located in the path of a third portion of the image-forming rays transmitted through said half mirror and said first and second dichroic mirrors, said third pick-up tube having its target plane located at the focus of a sagittal component of the third image-forming ray portion, thereby obtaining a vertically decreased resolution of said third reflected ray portion, and a fourth pick-up tube for receiving a fourth image-forMing ray portion reflected by said half mirror, said fourth pick-up tube obtaining a Y signal free of astigmatism, the thicknesses and the refractive indices of said first and second dichroic mirrors and said half mirror together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 - 1) sin2 u1/(n12 - sin2 u1)3/2 not = t2(n22 - 1) sin2 u2/(n22 - sin2 u2)3/2 not = t3 (n32 - 1) sin2 u3/(n32 - sin2 u3)3/2.

Claim 16

A color pick-up device wherein the input signal is a YRGB signal, comprising: an objective lens located in the path of image-forming rays transmitted from an object, a first dichroic mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said first mirror having a thickness t1and provided with a reflective film on the light ray receiving surface thereof, said first dichroic mirror having a refractive index n1and making an angle u1 with the optical axis of the device, a second dichroic mirror located in the path of image-forming rays transmitted through said first dichroic mirror for reflecting a second portion of the image-forming rays transmitted through said first mirror, said second dichroic mirror having a thickness t2and provided with a reflective film on the surface opposite to the light ray receiving surface thereof, said second dichroic mirror having a refractive index n2and making an angle u2 with the optical axis, a half mirror located between said lens and said first mirror in the path of said image-forming rays and having a thickness t3 and a refractive index n3and making an angle u3 with the optical axis, the angles u2 and u3 being displaced 90* about the optical axis relative to the angle u1 a first pick-up tube for receiving said first portion of the image-forming rays reflected by said first dichroic mirror, said first pick-up tube having its traget plane located at the focus of a sagittal component of the first reflected image-forming ray portion, thereby obtaining a vertically decreased resolution of said first reflected ray portion, a second pick-up tube for receiving said second portion of the image-forming rays reflected by said second dichroic mirror, said second pick-up tube having its target plane located at the focus of a sagittal component of the second reflected image-forming ray portion, thereby obtaining a vertically decreased resolution of said second image-forming ray portion, a third pick-up tube located in the path of a third portion of the image-forming rays transmitted through said half mirror and said first and second dichroic mirrors, said third pick-up tube having its target plane located at the focus of a sagittal component of the third image-forming ray portion, thereby obtaining a vertically decreased resolution of said third reflected ray portion, and a fourth pick-up tube for receiving a fourth image-forMing ray portion reflected by said half mirror, said fourth pick-up tube obtaining a Y signal free of astigmatism, the thicknesses and the refractive indices of said first and second dichroic mirrors and said half mirror together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 - 1) sin2 u1/(n12 - sin2 u1)3/2 not = t2(n22 - 1) sin2 u2/(n22 - sin2 u2)3/2 not = t3 (n32 - 1) sin2 u3/(n32 - sin2 u3)3/2.

Claim 17

A color pick-up device according to claim 12, wherein said first ray portion lies in the red frequency spectrum, said second ray portion lies in the blue frequency spectrum and said third ray portion lies in the green frequency spectrum.

Claim 18

A color pick-up device comprising: an objective lens located in the path of image-forming rays transmitted from an object, a half mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said half mirror having a thickness t1and provided with a reflective film on the ray receiving surface thereof, said half mirror having a refractive index n1and making an angle u1 with the optical axis of the device, a dichroic mirror located in the path of image-forming rays transmitted through said half mirror for reflecting a second portion of the image-forming rays transmitted through the half mirror, said dichroic mirror having a thickness t2and provided with a reflective film on the ray receiving surface thereof, said dichroic mirror having a refractive index n2and making an angle u2 with the optical axis, the angles u1 and u2 being displaced 90* about the optical axis from each other, a first pick-up tube for receiving said first portion of the image-forming rays reflected by said half mirror, said first pick-up tube located to receive said first image-forming rays free of astigmatism, a second pick-up tube for receiving said second portion of the image-forming rays reflected by said dichroic mirror, said second pick-up tube having its target plane located at the focus of a sagittal component of the second reflected ray portion, thereby obtaining vertically decreased resolution of said second image-forming rays, and a third pick-up tube located in the path of a third image-forming ray portion transmitted through said half and dichroic mirrors, said third pick-up tube having its target plane located at the focus of a sagittal component of the penetrating image-forming rays, thereby obtaining a vertically decreased resolution of a third image-forming ray, the thicknesses and the refractive indices of said mirrors together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 - 1) sin2 u1/(n12 - sin2 u1)3/2 not = t2 (n22 - 1) sin2 u2/(n22 - sin2 u2)3/2.

Claim 19

A color pick-up device comprising: an objective lens located in the path of image-forming rays transmitted from an object, a half mirror located in the path of image-forming rays transmitted through said objective lens for reflecting a first portion of the image-forming rays transmitted through said objective lens, said half mirror having a thickness t1and provided with a reflective film on the ray receiving surface thereof, said half mirror having a refractive index n1and making an angle u1 with the optical axis of the device, a dichroic mirror located in the path of image-forming rays transmitted through said half mirror for reflecting a second portion of the image-forming rays transmitted through the half mirror, said dichroic mirror having a thickness t2and provided with a reflective film on the ray receiving surface thereof, said dichroic mirror having a refractive index n2and making an angle u2 with the optical axis, the angles u1 and u2 being displaced 90* about the optical axis from each other, a first pick-up tube for receiving said first portion of the image-forming rays reflected by said half mirror, said first pick-up tube located to receive said first image-forming rays free of astigmatism, a second pick-up tube for receiving said second portion of the image-forming rays reflected by said dichroic mirror, said second pick-up tube having its target plane located at the focus of a sagittal component of the second reflected ray portion, thereby obtaining vertically decreased resolution of said second image-forming rays, and a third pick-up tube located in the path of a third image-forming ray portion transmitted through said half and dichroic mirrors, said third pick-up tube having its target plane located at the focus of a sagittal component of the penetrating image-forming rays, thereby obtaining a vertically decreased resolution of a third image-forming ray, the thicknesses and the refractive indices of said mirrors together with the angles made by said mirrors with the optical axis being so chosen that: t1 (n12 - 1) sin2 u1/(n12 - sin2 u1)3/2 not = t2 (n22 - 1) sin2 u2/(n22 - sin2 u2)3/2.