US4391506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving method and apparatus for illumination type imaging system
Assignee: Ricoh Co Ltd
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Filing: 1981-11-23
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Granted: 1983-07-05
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Expires: 2001-11-23
Abstract
Abstract A reciprocating illumination type imaging system is driven by a first drive source and a rotatable photoconductive drum is driven by a second drive source. A time period necessary for the drum to rotate a given angle is measured. The measured time period is compared with a predetermined reference time period to thereby estimate a fluctuation component in the time period of rotation of the drum in accordance with a result of the comparison. A start or buildup target speed during a buildup scanning speed motion of the imaging system and a constant target speed during a constant scanning speed motion are individually preset or determined in accordance with the estimated fluctuation component. The imaging system comprises an optical lens having a given focal length. The first and second drive sources constitute a drive mechanism. The preset buildup target speed and/or the preset constant target speed is compensated in conformity with a deviation of the focal length of the lens from a nominal focal length and a deviation of a mechanical precision of the drive mechanism from a nominal mechanical precision. Further, the speed of the imaging system during a constant scanning speed motion is detected. The preset constant target speed is compensated in accordance with the detected speed of the imaging system.
Inventors
- 👤 Hiroshi Koide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:08
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/28; G03G15/30; G03G15/305; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522; G03B27/525; G03B27/526
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
A method of driving a movable imaging system which is driven by a first drive source in synchronism with a movable photoconductive member which is driven by a second drive source, said method comprising the steps of: (a) measuring a time period necessary for the photoconductive member to move a given distance; (b) comparing the measured time period with a predetermined reference time period to thereby estimate a fluctuation component in the time period of movement of the photoconductive member in accordance with a result of the comparison; (c) presetting or determining a buildup target speed and a constant target speed during a buildup scanning speed motion and a constant scanning speed motion of the imaging system in accordance with the estimated fluctuation component respectively; and (d) moving the imaging system at the preset buildup and constant target speeds during buildup and constant scanning speed motions thereof, respectively; whereby the imaging system is moved in synchronism with the photoconductive member.
Claim 2
Independent Claim
160 words
A method of driving a movable imaging system which is driven by a first drive source in synchronism with a movable photoconductive member which is driven by a second drive source, said method comprising the steps of: (a) measuring a time period necessary for the photoconductive member to move a given distance; (b) comparing the measured time period with a predetermined reference time period to thereby estimate a fluctuation component in the time period of movement of the photoconductive member in accordance with a result of the comparison; (c) presetting or determining a buildup target speed and a constant target speed during a buildup scanning speed motion and a constant scanning speed motion of the imaging system in accordance with the estimated fluctuation component respectively; and (d) moving the imaging system at the preset buildup and constant target speeds during buildup and constant scanning speed motions thereof, respectively; whereby the imaging system is moved in synchronism with the photoconductive member.
Claim 3
Dependent Claim
84 words
A method as claimed in claim 1, in which the imaging system comprises an optical lens having a given focal length and the first and second drive sources constitute a drive mechanism, said method further comprising the following step (e), after step (c), of: (e) compensating the preset buildup target speed in conformity with a deviation of the focal length of the lens from a nominal focal length and a deviation of a mechanical precision of the drive mechanism from a nominal mechanical precision.
Claim 4
Dependent Claim
84 words
A method as claimed in claim 1, in which the imaging system comprises an optical lens having a given focal length and the first and second drive sources constitute a drive mechanism, said method further comprising the following step (f), after step (c), of: (f) compensating the preset constant target speed in conformity with a deviation of the focal length of the lens from a nominal focal length and a deviation of the mechanical precision of the drive mechanism from a nominal mechanical precision.
Claim 5
Dependent Claim
51 words
A method as claimed in claim 1, further comprising the following steps (g) and (h), after step (c), of: (g) detecting a speed of the imaging system during a constant scanning speed motion; and (h) compensating the preset constant target speed in accordance with the detected speed of the imaging system.
Claim 6
Dependent Claim
36 words
A method as claimed in claim 1, in which said photoconductive member comprises a rotatable drum of an electrostatic copying apparatus on which an electrostatic image of an original document is formed by the imaging system.
Claim 7
Independent Claim
162 words
An apparatus for driving a reciprocable imaging system in synchronism with a movable photoconductive member in electrostatic photography comprising: first drive means for driving the imaging system; second drive means for driving the photoconductive member; measuring means for measuring a time period necessary for the photoconductive member to move a given distance; comparing means for comparing the time period with a predetermined reference time period to thereby estimate a fluctuation component in the time period of movement of the photoconductive member in accordance with a result of the comparison; and presetting means for determining a buildup target speed and a constant target speed during a buildup scanning speed motion and a constant scanning speed motion of the imaging system in accordance with the estimated fluctuation component respectively; whereby the imaging system is moved at the preset buildup and constant target speeds during buildup and constant scanning speed motions, respectively, so that the imaging system is moved in synchronism with the photoconductive member.
Claim 8
Independent Claim
162 words
An apparatus for driving a reciprocable imaging system in synchronism with a movable photoconductive member in electrostatic photography comprising: first drive means for driving the imaging system; second drive means for driving the photoconductive member; measuring means for measuring a time period necessary for the photoconductive member to move a given distance; comparing means for comparing the time period with a predetermined reference time period to thereby estimate a fluctuation component in the time period of movement of the photoconductive member in accordance with a result of the comparison; and presetting means for determining a buildup target speed and a constant target speed during a buildup scanning speed motion and a constant scanning speed motion of the imaging system in accordance with the estimated fluctuation component respectively; whereby the imaging system is moved at the preset buildup and constant target speeds during buildup and constant scanning speed motions, respectively, so that the imaging system is moved in synchronism with the photoconductive member.
Claim 9
Dependent Claim
79 words
An apparatus as claimed in claim 6, in which the imaging system comprises an optical lens having a given focal length and the first and second drive sources constitute a drive mechanism, said apparatus further comprising first compensating means for compensating the preset buildup target speed in conformity with a deviation of the focal length from a nominal focal length of the lens and a deviation of a mechanical precision of the drive mechanism from a nominal mechanical precision.
Claim 10
Dependent Claim
42 words
An apparatus as claimed in claim 7, further comprising second compensating means for compensating the preset constant target speed in conformity with the deviation of the focal length of the lens and the deviation of the mechanical precision of the drive mechanism.
Claim 11
Dependent Claim
46 words
An apparatus as claimed in claim 6, further comprising detecting means for detecting a speed of the imaging system during a constant scanning speed motion, and third compensating means for compensating the preset constant target speed in accordance with the detected speed of the imaging system.
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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |