US4390882A
Expired / Lapsed
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Density adjusting method in image recording
Assignee: Fujifilm Holdings Corp
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Filing: 1981-11-05
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Granted: 1983-06-28
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Expires: 2001-11-05
Abstract
Abstract In a process of image recording by scanning a recording material with a light beam modulated by an image signal, 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.
Inventors
- 👤 Yuji Ohara
- 👤 Kazuo Horikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:17
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
In a process of recording an image by scanning a recording material with a light beam modulated by an image signal, a method of adjusting the image density in the image recording which comprises the steps of; controlling the intensity of a light beam at predetermined intervals as a function of a clock pulse for obtaining picture elements of said image, recording a picture element only for a predetermined recording time within each said predetermined interval and not effecting recording of a picture element for the remainder of said predetermined interval, and adjusting the density of the entire recorded image by changing said predetermined recording time.
Claim 2
Dependent Claim
106 words
In a process of recording an image by scanning a recording material with a light beam modulated by an image signal, a method of adjusting the image density in the image recording which comprises the steps of; controlling the intensity of a light beam at predetermined intervals as a function of a clock pulse for obtaining picture elements of said image, recording a picture element only for a predetermined recording time within each said predetermined interval and not effecting recording of a picture element for the remainder of said predetermined interval, and adjusting the density of the entire recorded image by changing said predetermined recording time.
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
29 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 in two directions.
Claim 5
Dependent Claim
64 words
A method of adjusting the image density in the image recording as defined in claim 1 or 2 wherein said predetermined recording time is changed by turning on the image signal, which is input to a means for driving a light beam modulator, for a predetermined time during said predetermined interval and changing said predetermined time during which said image signal is turned on.
Claim 6
Dependent Claim
42 words
A method of adjusting the image density in the image recording as defined in claim 4 wherein an analog switch means is inserted into the signal transmission system between an image information source and said means for driving a light beam modulator.
Claim 7
Dependent Claim
44 words
A method of adjusting the image density in the image recording as defined in claim 5 wherein a one-shot-multivibrator means is used to generate a pulse having a predetermined width, and the output of said one-shot-multivibrator means is fed to said analog switch means.
Claim 8
Dependent Claim
45 words
A method of adjusting the image density in the image recording as defined in claim 6 wherein a time constant circuit having a variable resistor is connected to said one-shot-multivibrator means, and the setting of said variable resistor is changed to change said predetermined time.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |