EP0051978A2
Expired / Lapsed
EP
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Density adjusting method in image recording
Assignee: Fujifilm Holdings Corp
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Filing: 1981-11-04
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Granted: —
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Expires: 2001-11-04
Abstract
Abstract In a process of image recording by scanning a recording material (5) with a laser beam modulated by an image signal (S), the density of the recorded image is adjusted by controlling the light intensity during a predetermined interval using a clock pulse for picture elements, recording an image for a predetermined time within the predetermined interval, and changing the predetermined recording time for the entire image or only portions thereof. The recording time is changed in a very simple manner, for example, by operating a variable resistor (R).
Inventors
- 👤 Yuji Ohara
- 👤 Kazuo Horikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:10
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
In a process of recording an image by scanning a recording material (5) with a light beam modulated by an image signal, a method of adjusting the image density in the image recording which comprises controlling the intensity of a light beam at predetermined intervals (Tl) by use of a clock pulse (Pl) for picture elements, recording an image only for a predetermined time (T2) within each said predetermined interval (Tl) and not effecting the recording for the rest of said predetermined interval (Tl), and adjusting the density of the recorded image by changing said predetermined recording time (T2),
Claim 2
Dependent Claim
99 words
In a process of recording an image by scanning a recording material (5) with a light beam modulated by an image signal, a method of adjusting the image density in the image recording which comprises controlling the intensity of a light beam at predetermined intervals (Tl) by use of a clock pulse (Pl) for picture elements, recording an image only for a predetermined time (T2) within each said predetermined interval (Tl) and not effecting the recording for the rest of said predetermined interval (Tl), and adjusting the density of the recorded image by changing said predetermined recording time (T2),
Claim 3
Dependent Claim
24 words
A method of adjusting the image density in the image recording as defined in claim 1 wherein said light beam is a laser beam.
Claim 4
Dependent Claim
31 words
A method of adjusting the image density in the image recording as defined in claim 1 or 2 wherein said light beam scans the recording material (5) in two directions (X,Y).
Claim 5
Dependent Claim
71 words
A method of adjusting the image density in the image recording as defined in claim 1 or 2 wherein said predetermined recording time (T2) is changed by turning on the image signal (S), which is input to a means (6) for driving a light beam modulator, for a predetermined time (T2) during said predetermined interval (Tl) and changing said predetermined time (T2) during which said image signal (S) is turned on.
Claim 6
Dependent Claim
45 words
A method of adjusting the image density in the image recording as defined in claim 4 wherein an analog switch means (7) is inserted into the signal transmission system between an image information source (8) and said means (6) for driving a light beam modulator.
Claim 7
Dependent Claim
47 words
A method of adjusting the image density in the image recording as defined in claim 5 wherein a one-shot-multivibrator means (10) is used to generate a pulse (P2) having a predetermined width, and the output of said one-shot-multivibrator means is fed to said analog switch means (7).
Claim 8
Dependent Claim
50 words
A method of adjusting the image density in the image recording as defined in claim 6 wherein a time constant circuit (lOa) having a variable resistor (R) is connected to said one-shot-multivibrator means (10), and the setting of said variable resistor (R) is changed to change said predetermined time (T2).
References Cited (Backward Citations)
No citation records indexed.
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