Patent US4905090A successfully refreshed from Google Patents.
US4905090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reading or writing method and apparatus thereof
Assignee: Sharp Corp
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Filing: 1988-09-28
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Granted: 1990-02-27
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Expires: 2008-09-28
Abstract
Abstract The present invention provides a reading or writing method and apparatus thereof for reading data on a medium or writing data thereon by reciprocatively driving a reading/writing head over the medium. The method comprises driving the head forward at a predetermined speed at all times, and returning the head at a predetermined maximum speed when the reading or writing length is at a maximum, or at a speed lower than the maximum speed when the reading or writing length is shorter than the maximum so as to complete the reciprocation of the head within the same period as when the reading or writing length is the maximum.
Inventors
- 👤 Hideyuki Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:03
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/0402; H04N1/0405; H04N1/042; H04N1/0443
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
A reading or writing method for reading data from a medium or writing data thereon by reciprocatively driving a reading/writing head over the medium, the reading or writing method comprising: determining a reading or writing length of one line from the medium size or the writing data, respectively; driving the head forward at a predetermined speed independent of reading or writing length; and returning the head at a speed which is a predetermined maximum speed when the reading or writing length is at a maximum or at a speed lower than the maximum speed when the reading or writing length is shorter than the maximum so as to complete the reciprocation of the head within a substantially constant time period independent of the length of one line.
Claim 2
Dependent Claim
127 words
A reading or writing method for reading data from a medium or writing data thereon by reciprocatively driving a reading/writing head over the medium, the reading or writing method comprising: determining a reading or writing length of one line from the medium size or the writing data, respectively; driving the head forward at a predetermined speed independent of reading or writing length; and returning the head at a speed which is a predetermined maximum speed when the reading or writing length is at a maximum or at a speed lower than the maximum speed when the reading or writing length is shorter than the maximum so as to complete the reciprocation of the head within a substantially constant time period independent of the length of one line.
Claim 3
Dependent Claim
54 words
A method as defined in claim 1 wherein, when the reading or writing length is shorter than the maximum, the head is returned at a low speed, related to the reading or writing length so as to complete the reciprocation of the head with the same period as when the length is the maximum.
Claim 4
Dependent Claim
171 words
A reading or writing apparatus comprising: transport device for transporting a medium in a first direction, a head for reading data from the medium or writing data thereon, head drive means for reciprocatively driving the head over the medium in a second direction perpendicular to the first direction of transport of the medium, means for judging the scan length necessary for reading or writing a single line from the medium size or from the writing data respectively, and control means for controlling the transport means and the head drive means in synchronism to drive the head forward at a predetermined speed independent of the scan length and to return the head at a predetermined maximum speed when the reading or writing length determined by the judging means is at a maximum, or at a lower speed related to the scan length when the reading or writing scan length is shorter than the maximum so as to complete the reciprocation of the head within a substantially constant period regardless of scan length.
Claim 5
Dependent Claim
171 words
A reading or writing apparatus comprising: transport device for transporting a medium in a first direction, a head for reading data from the medium or writing data thereon, head drive means for reciprocatively driving the head over the medium in a second direction perpendicular to the first direction of transport of the medium, means for judging the scan length necessary for reading or writing a single line from the medium size or from the writing data respectively, and control means for controlling the transport means and the head drive means in synchronism to drive the head forward at a predetermined speed independent of the scan length and to return the head at a predetermined maximum speed when the reading or writing length determined by the judging means is at a maximum, or at a lower speed related to the scan length when the reading or writing scan length is shorter than the maximum so as to complete the reciprocation of the head within a substantially constant period regardless of scan length.
Claim 6
Dependent Claim
22 words
An apparatus as defined in claim 3 further comprising sensor means for detecting the size of the medium such as a microswitch.
Claim 7
Dependent Claim
22 words
An apparatus as defined in claim 3 wherein each of the transport means and the head drive means comprises a stepping motor.
Claim 8
Dependent Claim
12 words
An apparatus as defined in claim 3 which is a facsimile apparatus.
Claim 9
Dependent Claim
172 words
A reading or writing apparatus comprising: transport means for transporting a medium in a first direction, a head for reading data from the medium or writing data thereon, head drive means for reciprocatively driving the head over the medium in a second direction perpendicular to the first direction of transport of the medium, means for judging the scan length necessary for reading or writing a single line from the medium size or from the writing data respectively, and control means for controlling the transport means and the head drive means in synchronism to drive the head forward at a predetermined speed independent of the scan length, and to return the head at a predetermined maximum speed when the reading or writing scan length determined by the judging means is at a maximum and at a speed related to the reading or writing length when the reading or writing length is shorter than the maximum so as to complete the reciprocation of the head within a substantially constant period regardless of scan length.
Claim 10
Dependent Claim
172 words
A reading or writing apparatus comprising: transport means for transporting a medium in a first direction, a head for reading data from the medium or writing data thereon, head drive means for reciprocatively driving the head over the medium in a second direction perpendicular to the first direction of transport of the medium, means for judging the scan length necessary for reading or writing a single line from the medium size or from the writing data respectively, and control means for controlling the transport means and the head drive means in synchronism to drive the head forward at a predetermined speed independent of the scan length, and to return the head at a predetermined maximum speed when the reading or writing scan length determined by the judging means is at a maximum and at a speed related to the reading or writing length when the reading or writing length is shorter than the maximum so as to complete the reciprocation of the head within a substantially constant period regardless of scan length.
Claim 11
Dependent Claim
22 words
An apparatus as defined in claim 7 further comprising sensor means for detecting the size of the medium such as a microswitch.
Claim 12
Dependent Claim
22 words
An apparatus as defined in claim 7 wherein each of the transport means and the head drive means comprises a stepping motor.
Claim 13
Dependent Claim
12 words
An apparatus as defined in claim 7 which is a facsimile apparatus.
Claim 14
Independent Claim
127 words
A method of reciprocatively driving a reading/writing head over a medium to read data therefrom or write data thereon, said medium having a size which may vary, comprising: pog,21 determining the length of a scan across said medium; said scan length being varied in response to medium size during reading or the write data during writing; driving said reading/writing head across said medium from an initial position at a predetermined constant scan rate over said scan length; returning said reading/writing head to said initial position at a return speed related to said scan length; said return speed being varied so that the time for driving at said predetermined constant scan rate and the time for driving at said return speed collectively equal a constant scan cycle period.
Claim 15
Independent Claim
127 words
A method of reciprocatively driving a reading/writing head over a medium to read data therefrom or write data thereon, said medium having a size which may vary, comprising: pog,21 determining the length of a scan across said medium; said scan length being varied in response to medium size during reading or the write data during writing; driving said reading/writing head across said medium from an initial position at a predetermined constant scan rate over said scan length; returning said reading/writing head to said initial position at a return speed related to said scan length; said return speed being varied so that the time for driving at said predetermined constant scan rate and the time for driving at said return speed collectively equal a constant scan cycle period.
Claim 16
Dependent Claim
40 words
The method of driving of claim 11 wherein the return speed is varied in relationship to scan length to reduce the return speed for a scan smaller than a maximum scan, thereby, reducing noise caused by said step of returning.
References Cited (Backward Citations)
US4099208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |