US4687944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling magnification variation
Assignee: Dainippon Screen Manufacturing Co Ltd
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Filing: 1985-07-30
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Granted: 1987-08-18
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Expires: 2005-07-30
Abstract
Abstract In a method for controlling magnification variation in which an original picture image is projected on a light receiving surface with a desired magnification, the projected picture image is moved in the sub-scanning direction which intersects the main scanning direction where the sensor is aligned, and the feeding speed (V) in the sub-scanning direction and the electric charge storage time are controlled.
Inventors
- 👤 Ikuo Mitsuka
- 👤 Akira Kuwabara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:13
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056; H04N1/387; H04N1/393
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
A method for controlling magnification variation comprising the steps of: projecting a picture image of an original on a light receiving surface of a line sensor by an optical means; moving said picture image projected on the light receiving surface of the line sensor in a speed-variable main scanning direction which intersects at right angles with a speed-variable sub-scanning direction in which said sensor is aligned at right angles by a feeding means; and controlling the variable feeding speed in both the main direction and the sub-scanning direction and controlling an electric charge storage time of said line sensor so that a reproduced picture image of a desired magnification variation may be obtained.
Claim 2
Independent Claim
113 words
A method for controlling magnification variation comprising the steps of: projecting a picture image of an original on a light receiving surface of a line sensor by an optical means; moving said picture image projected on the light receiving surface of the line sensor in a speed-variable main scanning direction which intersects at right angles with a speed-variable sub-scanning direction in which said sensor is aligned at right angles by a feeding means; and controlling the variable feeding speed in both the main direction and the sub-scanning direction and controlling an electric charge storage time of said line sensor so that a reproduced picture image of a desired magnification variation may be obtained.
Claim 3
Dependent Claim
81 words
A method according to claim 1, wherein a substantially middle value between the minimum and the maximum limit values in a permissible range of said electric charge storage time (τ) of said line sensor is preferentially set up, in the case of the feeding value (V) being varied for setting up and when the feeding speed (V) exceeds the uppermost limit value, the electric charge storage time (τ) is varied so that the feeding value (V) may be within the range.
Claim 4
Dependent Claim
63 words
A method according to claim 1, wherein said feeding speed (V) is previously set up, and in the case of magnification being set up by varying the electric charge storage time (τ) and when the electric charge storage time (τ) exceeds both the limit values, the feeding speed (V) is varied so that the storage time (τ) may be within the permissible range.
Claim 5
Independent Claim
48 words
A method according to any of claims 1 to 3, wherein when magnification in the sub-scanning direction exceeds either of the uppermost or the lowerest limit values, the magnification is varied by increasing or trimming picture information on one of the main scanning lines in the sub-scanning direction.
Claim 6
Independent Claim
64 words
A method according to any of claims 1 to 4, wherein a light quantity setup conditions on diaphragm of a lens and/or light intensity of a light source according to an optical magnification value (τ) decided by size of the original picture and that of a desired reproduced picture image and the value of the electric charges storage time (τ) of the line sensor.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein the feeding speed in the sub-scanning direction is adjusted first, followed by the adjustment of the feeding speed in the main scanning direction.
Claim 8
Dependent Claim
28 words
The method of claim 6 wherein the feeding speed in the sub-scanning direction may be further adjusted after adjustment of the feeding speed in the main scanning direction.
References Cited (Backward Citations)
US4149091A
Cited
US4591727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |