EP0140244A2
Expired / Lapsed
EP
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Image scanning read-out method
Assignee: Fujifilm Holdings Corp
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Filing: 1984-10-11
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Granted: —
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Expires: 2004-10-11
Abstract
Abstract O A sheet carrying an image stored therein is scanned by a light beam emitted by a light source. Light which is obtained by the scanning of the sheet and which carries the image is detected by use of a photomultiplier. When the level of output current of the photomultiplier becomes higher than a predetermined standard level, the intensity of the light beam is decreased so that the level of the output current of the photomultiplier does not exceed the predetermined standard level, thereby preventing the photomultiplier from being broken by light of high intensity.
Inventors
- 👤 Kazuo C/O Fuji Photo Film Co. Ltd. Horikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 16:23
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
An image scanning read-out method for reading out an image stored in a sheet by scanning the sheet by a light beam emitted by a light source and detecting light which is obtained by the scanning of the sheet and which carries the image by use of a photomultiplier, wherein the improvement comprises the step of: when the output current level of said photomultiplier becomes higher than a predetermined standard level, decreasing the intensity of said light beam so that the output current level of said photomultiplier does not exceed the predetermined standard level.
Claim 2
Dependent Claim
94 words
An image scanning read-out method for reading out an image stored in a sheet by scanning the sheet by a light beam emitted by a light source and detecting light which is obtained by the scanning of the sheet and which carries the image by use of a photomultiplier, wherein the improvement comprises the step of: when the output current level of said photomultiplier becomes higher than a predetermined standard level, decreasing the intensity of said light beam so that the output current level of said photomultiplier does not exceed the predetermined standard level.
Claim 3
Dependent Claim
44 words
A method as defined in Claim 1 wherein said sheet is a stimulable phosphor sheet provided on the surface with a stimulable phosphor carrying said image stored therein, and said light carrying the image is light emitted by said stimulable phosphor upon stimulation thereof.
Claim 4
Dependent Claim
39 words
A method as defined in Claim 1 wherein said sheet is a one carrying an image constituted by a density pattern, and said light carrying the image is light transmitted through the sheet or light reflected by the sheet.
Claim 5
Dependent Claim
35 words
A method as defined in Claim 1 wherein the step of decreasing the intensity of said light beam is effected by modulation of an acousto-optic modulator positioned on an optical path of said light beam.
Claim 6
Dependent Claim
37 words
A method as defined in Claim 1 wherein said light source is a semiconductor laser, and the step of decreasing the intensity of said light beam is effected by decreasing the current flowing through said semiconductor laser.
References Cited (Backward Citations)
No citation records indexed.
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