Patent EP0202811A1 successfully refreshed from Google Patents.
EP0202811A1
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Exposing system and method
Assignee: De la Rue Holdings Ltd
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Filing: 1986-05-06
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Granted: —
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Expires: 2006-05-06
Abstract
Abstract A method and apparatus for exposing a pair of radiation sensitive surfaces to a beam of optical radiation is described. The apparatus comprises a support (20) for supporting the radiation sensitive surfaces which may be provided on opposite sides of an identification card. A laser (1) provides a laser beam which impinges on a pair of resonant scanners (10, 11) which cause radiation impinging on their respective mirrors to be reflected onto opposite surfaces of the identification card. A control system (103) causes the mirrors of the scanners (10, 11) to oscillate in quadrature. The laser beam passes through an A/0 modulator (4) responsive to signals from the control system (103) to cause radiation to impinge alternately on one or the other of the scanners (10, 11). The scanners (10,11) are arranged such that when the beam of radiation impinges on a scanner, the radiation is caused to impinge on and to scan across the respective surface of the identification card (19) supported by the support (20), in response to oscillation of the scanner.
Inventors
- 👤 Laurence John Robinson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 15:40
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; G06K15/1219; G06K15/1295
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
78 words
A method of exposing radiation sensitive means (19) to a beam of radiation, the method comprising causing a pair of pivoted radiation guides (10,11) to oscillate with a predetermined phase relationship; and causing a beam of radiation to impinge alternately on one or the other of the radiation guides, the radiation guides being arranged such that impinging radiation is caused to impinge on and scan across the radiation sensitive means (19) in response to oscillation of the guides.
Claim 2
Independent Claim
78 words
A method of exposing radiation sensitive means (19) to a beam of radiation, the method comprising causing a pair of pivoted radiation guides (10,11) to oscillate with a predetermined phase relationship; and causing a beam of radiation to impinge alternately on one or the other of the radiation guides, the radiation guides being arranged such that impinging radiation is caused to impinge on and scan across the radiation sensitive means (19) in response to oscillation of the guides.
Claim 3
Dependent Claim
14 words
A method according to claim 1, wherein the radiation guides (10,11) oscillate in quadrature.
Claim 4
Dependent Claim
53 words
A method according to claim 2, wherein the oscillation rate of each radiation guide (10,11) is such that the time for a guide to reverse direction is less than or equal to the time for the other radiation guide to cause the beam of radiation to scan across the radiation sensitive means (19).
Claim 5
Independent Claim
19 words
A method according to any of the preceding claims, wherein the radiation guides (10,11) oscillate in a sinusoidal manner.
Claim 6
Independent Claim
52 words
A method according to any of the preceding claims, further comprising causing relative movement between the radiation sensitive means (19) and the beams of radiation from the radiation guides (10,11) whereby the beams of radiation are caused to scan along respective sets of successive, different scan lines of the radiation sensitive means.
Claim 7
Independent Claim
28 words
A method according to any of the preceding claims, wherein the radiation guides are arranged to cause opposite sides of the radiation sensitive means (19) to be exposed.
Claim 8
Independent Claim
17 words
A method according to any of the preceding claims, wherein the beam of radiation comprises optical radiation.
Claim 9
Independent Claim
41 words
A method according to any of the preceding claims, wherein the beam of radiation is modulated in response to control information relating to characters, images and the like which it is desired should be recorded on the radiation sensitive means (19).
Claim 10
Dependent Claim
137 words
An exposing system comprising a support (20) for supporting radiation sensitive means; a radiation beam source (1); a pair of radiation guide assemblies (10,11) each having a radiation guide (12) and control means (17) for oscillating the guide, the control means being controlled in use to cause the radiation guides to oscillate with a predetermined phase relationship; a control system (102); and directing means (4) responsive to signals from the control system to cause radiation from the radiation beam source (1) to impinge alternately on one or the other of the radiation guides (12), the radiation guides being arranged such that when the beam of radiation impinges on a radiation guide, the radiation is caused to impinge on and scan across radiation sensitive means (19) supported by the support (20), in response to oscillation of the guide.
Claim 11
Dependent Claim
137 words
An exposing system comprising a support (20) for supporting radiation sensitive means; a radiation beam source (1); a pair of radiation guide assemblies (10,11) each having a radiation guide (12) and control means (17) for oscillating the guide, the control means being controlled in use to cause the radiation guides to oscillate with a predetermined phase relationship; a control system (102); and directing means (4) responsive to signals from the control system to cause radiation from the radiation beam source (1) to impinge alternately on one or the other of the radiation guides (12), the radiation guides being arranged such that when the beam of radiation impinges on a radiation guide, the radiation is caused to impinge on and scan across radiation sensitive means (19) supported by the support (20), in response to oscillation of the guide.
Claim 12
Dependent Claim
46 words
A system according to claim 9, wherein the directing means includes a beam modulator (4), and modulator control means for causing the modulator to diffract the impinging beam of radiation alternately in first and second directions whereby the beam is fed towards the corresponding radiation guide.
Claim 13
Dependent Claim
51 words
A system according to claim 9 or claim 10, wherein the control system is adapted to control the beam modulator (4) also to modulate the beam in response to control information relating to characters, images and the like which it is desired should be recorded on the radiation sensitive means (19).
Claim 14
Independent Claim
141 words
A system according to any of claims 9 to 11, wherein each radiation guide (12) comprises a rotatable reflective surface, the apparatus further comprising, for each radiation guide, an auxiliary source of radiation (23), a set of reflecting surfaces (31) facing the rotatable reflective surface in use and spaced apart along an arc whose centre of curvature is substantially at the centre of rotation of the rotatable, reflective surface in use, focussing means (26), and radiation detection means (40), the focussing means being positioned such that radiation from the source impinges on the focussing means and is focussed onto the arc via the rotatable reflective surface, and being such that radiation reflected from one of the reflecting surfaces and reflected from the rotatable reflective surface is focussed by the focussing means onto a substantially fixed position coupled with the detection means.
Claim 15
Dependent Claim
117 words
A system according to claim 12, further comprising, for each radiation guide, means for generating a plurality of auxiliary radiation beams; and one or more additional sets of reflecting surfaces (36-39) having a similar form to the one set of reflecting surfaces (31), the number of sets of reflecting surfaces being the same as the number of auxiliary beams of radiation, and a characteristic of each set of reflecting surfaces differing from the other sets of reflecting surfaces whereby in use the radiation detection means detects at least some of the radiation beams at each of a plurality of positions of the rotatable reflective surface such that the position of the rotatable, reflective surface can be monitored.
Claim 16
Dependent Claim
27 words
A system according to claim 13, wherein the characteristic of the sets of reflecting surfaces (31,36-39) comprises the width of each reflecting surface in the arc direction.
Claim 17
Independent Claim
32 words
A system according to any of claims 12 to 14, wherein the or each set of reflecting surfaces (31,36-39) comprises a plurality of reflecting strips (33) extending transversely to the arc direction.
Claim 18
Independent Claim
47 words
A system according to any of claims 12 to 15, wherein the set or sets of surfaces (31, 36-39) is sandwiched between a pair of protective members (29,30), at least the protective member facing the rotatable reflective surface (12) in use being substantially transparent to the radiation.
Claim 19
Independent Claim
28 words
A system according to claims 12 to 16, wherein the or each set of reflective surfaces is provided by chrome strips (33) positioned on a glass substrate (30).
Claim 20
Independent Claim
60 words
A system according to claims 12 to 18, wherein the focussing means (25) is substantially co-axial with the or each set of surfaces (31), the arrangement being such that radiation which has been reflected from the or each set of surfaces onto the rotatable, reflective surface is then reflected through the focussing means and is focussed onto the detection means.
Claim 21
Dependent Claim
15 words
A laser beam recording system including apparatus according to any of claims 9 to 18.
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