EP0204471A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improvements in or relating to iris and shutter arrangements
Assignee: Teledyne UK Ltd
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Filing: 1986-05-23
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Granted: —
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Expires: 2006-05-23
Abstract
Abstract @ An iris and shutter arrangement for camera, particularly a CCD camera, is provided in which a first liquid crystal display is formed of a plurality of concentric annuli of liquid crystal material and a second liquid crystal display is provided as a further plurality of coaxial annuli each of which overlies the space separating one annuli from the next in the first display. The first display also includes a relatively clear central circular area, defining the smallest aperture desired, which is covered by a circular area of liquid crystal material in the second display. The annuli in both cases are continuous save for breaks along a line forming a path for controlling conductors deposited upon the faceplates of the two displays.
Inventors
- 👤 Michael Henry Moody
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 20:42
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/70; H04N23/75; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/134309; G03; G03B; G03B9/00; G03B9/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
90 words
An iris and shutter arrangement for a camera comprising a first segmented liquid crystal member and a second segmented liquid crystal member mounted consecutively in the path of incident energy, said first and second members each comprising a plurality of discrete areas in said path which may be addressed individually to change their light transmissivity to vary the effective aperture provided by the display to said incident energy and wherein said discrete areas in the second member overly at least the boundaries between the discrete areas of said first member.
Claim 2
Dependent Claim
90 words
An iris and shutter arrangement for a camera comprising a first segmented liquid crystal member and a second segmented liquid crystal member mounted consecutively in the path of incident energy, said first and second members each comprising a plurality of discrete areas in said path which may be addressed individually to change their light transmissivity to vary the effective aperture provided by the display to said incident energy and wherein said discrete areas in the second member overly at least the boundaries between the discrete areas of said first member.
Claim 3
Dependent Claim
20 words
An arrangement as claimed in claim 1 and wherein said discrete areas are provided in the form of coaxial annuli.
Claim 4
Dependent Claim
42 words
An arrangement as claimed in claim 2 and wherein the innermost of said annuli in the first segmented liquid crystal member surrounds a circular area which has a relatively high energy transmissivity and represents the smallest aperture required of said iris arrangement.
Claim 5
Dependent Claim
46 words
An arrangement as claimed in claim 2 or 3 and wherein the radial dimensions of said annuli in the first member increase in an outward direction from annulus to annulus whereby a range of apertures may be obtained which is in accordance with a desired law.
Claim 6
Dependent Claim
18 words
An arrangement as claimed in any of claims 2 to 4 and wherein each annulus is substantially complete.
Claim 7
Dependent Claim
40 words
An arrangement as claimed in claim 5 and wherein each annulus is substantilly complete save that the annuli are broken along a radially extending line along which pass control electrical conductors for selectively energising said annuli of liquid crystal material.
Claim 8
Dependent Claim
23 words
An arrangement as claimed in claim 6 and wherein said control electrical conductors are conductive strips formed on one faceplate of said display.
Claim 9
Dependent Claim
43 words
An arrangement as claimed in claim 3 or in any of claims 4 to 7 as dependent upon claim 3 and wherein said circular central area of said first member is covered by a disc of liquid crystal material in said second member.
Claim 10
Dependent Claim
45 words
An arrangement as claimed in any of the above claims and wherein said liquid crystal material is guest/host material such that when a discrete area is energised the light transmissivity of that area changes from a relatively highly obstructive to a relatively highly passive state.
Claim 11
Dependent Claim
18 words
An arrangement as claimed in any of the above claims and wherein said incident energy is visible light.
Claim 12
Dependent Claim
15 words
An iris and shutter arrangement substantially as herein described with reference to the accompanying drawings.
Claim 13
Dependent Claim
15 words
An iris and shutter arrangement substantially as herein described with reference to the accompanying drawings.
Claim 14
Dependent Claim
16 words
A camera including an iris and shutter arrangement as claimed in any of the above claims.
Claim 15
Dependent Claim
15 words
A camera as claimed in claim 14 and wherein said camera is a CCD camera.
References Cited (Backward Citations)
No citation records indexed.
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