US4421398A — Focussing plate

Claim 1

Independent Claim 68 words

A focussing plate for use in a camera, comprising: a. a plurality of micro-lens shaped curved surfaces arranged on a substrate with each surface having a pitch in the range from 5 to 30 μm; and b. a plurality of curved surfaces positioned on the substrate in boundary spaces separating said micro-lens shaped curved surfaces, and having a curvature opposite to that of said micro-lens shaped curved surfaces.

Claim 2

Dependent Claim 68 words

A focussing plate for use in a camera, comprising: a. a plurality of micro-lens shaped curved surfaces arranged on a substrate with each surface having a pitch in the range from 5 to 30 μm; and b. a plurality of curved surfaces positioned on the substrate in boundary spaces separating said micro-lens shaped curved surfaces, and having a curvature opposite to that of said micro-lens shaped curved surfaces.

Claim 3

Dependent Claim 58 words

The focussing plate as set forth in claim 1, wherein a height distribution T(x,y) of the surface of said focussing plate where said micro-lens shaped curved surfaces are arranged is given by the following equation: T(x, y)=1/9[3+2{2 cos x·cos √3y+cos 2x}] (where: x and y denote mutually orthogonally intersecting coordinates within a plane parallel to the focussing plate).

Claim 4

Dependent Claim 57 words

The focussing plate as set forth in claim 1, wherein a height distribution T(x, y) of the surface of said focussing plate where said micro-lens shaped curved surfaces are arranged is given by the following equation: T(x, y)=1/4(cos x+cos y).sup.2 (wherein: x and y denote mutually orthogonally intersecting coordinates within a plane parallel with the focussing plate).

Claim 5

Dependent Claim 79 words

The focussing plate as set forth in claim 1, wherein a height distribution T'(x, y) of the surface of said focussing plate where said micro-lens shaped curved surfaces are arranged is given by the following equation: T'(x, y)=A·log.sub.10 {αT(x, y)+β}+B (wherein: T(x, y) is T(x, y)=1/9[3+2{2 cos x·cos √3y+cos 2x{] or T(x, y)=1/4(cos x+cos y); x and y denote mutually orthogonally intersecting coordinates within a plane parallel to the focussing plate; and A, B, α, and β represent constants).

Claim 6

Dependent Claim 25 words

The focussing plate as set forth in claim 1, wherein said micro-lens shaped curved surfaces have differing pitches in the two mutually orthogonally intersecting directions.

Claim 7

Dependent Claim 45 words

The focussing plate as set forth in claim 1, wherein said micro-lens shaped curved surfaces and those curved surfaces having a curvature opposite to that of said micro-lens shaped curved surfaces are in such a shape that an area ratio between them deviates from 1:1.

Claim 8

Dependent Claim 141 words

A focussing plate, comprising: a. a pluality of micro-lens shaped curved surfaces arranged on substrate; and b. a plurality of curved surface positioned on the substrate in boundary spaces separating said micro-lens shaped curved surface, and having a curvature opposite to that of said micro-lens shaped curved surfaces, wherein when, light having a wavelength of 550 nm is impinged, the zero-order transmitted light is in a range of from 0.5% and 10% in its light quantity ration with respect to said incident light, and further satisfies simultaneously at least two of the following three conditions: (i) the first-order transmitted and diffracted light is 1.0% and above, and 5% and below; (ii) the second-order transmitted and diffracted light is 1.0% and above, and 4% and below; and (iii) the third-order transmitted and diffracted light is 1.0% and above, and 3% and below.

Claim 9

Dependent Claim 141 words

A focussing plate, comprising: a. a pluality of micro-lens shaped curved surfaces arranged on substrate; and b. a plurality of curved surface positioned on the substrate in boundary spaces separating said micro-lens shaped curved surface, and having a curvature opposite to that of said micro-lens shaped curved surfaces, wherein when, light having a wavelength of 550 nm is impinged, the zero-order transmitted light is in a range of from 0.5% and 10% in its light quantity ration with respect to said incident light, and further satisfies simultaneously at least two of the following three conditions: (i) the first-order transmitted and diffracted light is 1.0% and above, and 5% and below; (ii) the second-order transmitted and diffracted light is 1.0% and above, and 4% and below; and (iii) the third-order transmitted and diffracted light is 1.0% and above, and 3% and below.

Claim 10

Dependent Claim 88 words

The focussing plate as set forth in claim 7, wherein a ratio between said zero-order transmitted light and the transmitted and diffracted lights of other orders satisfies simultaneously at least two of the following three conditions: (iv) the first-order transmitted and diffracted light is 0.5 times and above, and 3.0 times and below; (v) the second-order transmitted and diffracted light is 0.3 times and above, and 2.0 times and below; and (vi) the third-order transmitted and diffracted light is 0.2 times and above, and 1.0 times and below.

Claim 11

Dependent Claim 17 words

The focussing plate as set forth in claim 8, wherein said plate is an image projecting screen.

Claim 12

Dependent Claim 20 words

The focussing plate as set forth in claim 7, wherein said plate constitutes a focussing plate of a photographic camera.

Claim 13

Dependent Claim 46 words

The focussing plate as set forth in claim 7, which is obtained by an optical fabrication method comprising steps of: superposing three or more mutually coherent light beams to form a two-dimensional cyclic interference patterns; and leading the thus obtained interference pattern onto a recording material.

Claim 14

Dependent Claim 18 words

The focussing plate as set forth in claim 8, which constitutes the focussing plate of a photographic camera.

Claim 15

Dependent Claim 46 words

The focussing plate as set forth in claim 8, which is obtained by an optical fabrication method comprising steps of: superposing three or more mutually coherent light beams to form a two-dimensional cyclic interference patterns; and leading the thus obtained interference pattern onto a recording material.

Claim 16

Dependent Claim 46 words

The focussing plate as set forth in claim 9, which is obtained by an optical fabrication method comprising steps of: superposing three or more mutually coherent light beams to form a two-dimensional cyclic interference patterns; and leading the thus obtained interference pattern onto a recording material.

Claim 17

Dependent Claim 46 words

The focussing plate as set forth in claim 10, which is obtained by an optical fabrication method comprising steps of: superposing three or more mutually coherent light beams to form a two-dimensional cyclic interference patterns; and leading the thus obtained interference pattern onto a recording material.

Claim 18

Dependent Claim 46 words

The focussing plate as set forth in claim 12, which is obtained by an optical fabrication method comprising steps of: superposing three or more mutually coherent light beams to form a two-dimensional cyclic interference patterns; and leading the thus obtained interference pattern onto a recording material.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-12-19	1987-06-20	1987-12-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-12-19	1991-06-20	1991-12-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-12-19	1995-06-20	1995-12-20	$7700.00	Window Closed / Lapsed

Focussing plate

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