US4965748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser printer controller flexible frame buffer architecture which allows offsetting different input/output data widths
Assignee: Ricoh Co Ltd
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Filing: 1989-07-12
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Granted: 1990-10-23
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Expires: 2009-07-12
Abstract
Abstract The present invention relates to a frame buffer used by a laser printer controller to send video signals to a laser printer engine. The frame buffer allows software to have sufficient control over the dimension of the buffer and to have sufficient time to process data by setting different input/output data widths.
Inventors
- 👤 Hershow Chang
- 👤 Seong Kim
- 👤 Tetsuro Motoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:12
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/128
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
90 words
A laser printer controller system comprising a laser printer for printing data on a document, frame buffer memory means for providing variable digital data width data bus to said laser printer wherein said video data corresponds to the data to be printed on said document, control means having a certain data width data bus for controlling said variable data widths, wherein said variable data width is at least twice the width of said certain data width, said control means further including shift register means for interfacing to said laser printer.
Claim 2
Dependent Claim
90 words
A laser printer controller system comprising a laser printer for printing data on a document, frame buffer memory means for providing variable digital data width data bus to said laser printer wherein said video data corresponds to the data to be printed on said document, control means having a certain data width data bus for controlling said variable data widths, wherein said variable data width is at least twice the width of said certain data width, said control means further including shift register means for interfacing to said laser printer.
Claim 3
Dependent Claim
25 words
A system as in claim 1 wherein said frame buffer means include a variable size interface circuit for interfacing to said control means data bus.
Claim 4
Dependent Claim
24 words
A system as in claim 2 wherein said frame buffer means include a variable size output shift register for interfacing to said laser printer
Claim 5
Dependent Claim
30 words
A system as in claim 3 wherein said control means include direct memory access (DMA) control means for controlling the transfer of said wider data width to said shift register.
Claim 6
Dependent Claim
37 words
A system as in claim 4 wherein said frame buffer means include a plurality of memory banks wherein the input of each of said memory banks ash the same data width as said control means data bus.
Claim 7
Dependent Claim
22 words
A system as in claim 5 wherein the number of said data banks corresponds to match the speed of said laser printer.
Claim 8
Dependent Claim
23 words
A system as in claim 6 wherein said DMA means include means for activating all of said memory banks at the same time.
Claim 9
Dependent Claim
94 words
In a laser printer controller system including a large printer for printing data on a document, the apparatus comprising frame buffer memory means for providing variable digital video data width data bus to said laser printer wherein said video data corresponds to the data to be printed on said document, control means having a certain data width bus for controlling said variable data widths, wherein said variable data width is at least twice the width of said certain data width, said control means further including shift register means for interfacing to said laser printer.
Claim 10
Dependent Claim
94 words
In a laser printer controller system including a large printer for printing data on a document, the apparatus comprising frame buffer memory means for providing variable digital video data width data bus to said laser printer wherein said video data corresponds to the data to be printed on said document, control means having a certain data width bus for controlling said variable data widths, wherein said variable data width is at least twice the width of said certain data width, said control means further including shift register means for interfacing to said laser printer.
Claim 11
Dependent Claim
90 words
A raster printer controller system comprising a raster printer for printing data on a document, frame buffer memory means for providing variable digital data width data bus to said raster printer wherein said video data corresponds to the data to be printed on said document, control means having a certain data width data bus for controlling said variable data widths, wherein said variable data width is at least twice the width of said certain data width, said control means further including shift register means for interfacing to said raster printer.
Claim 12
Dependent Claim
90 words
A raster printer controller system comprising a raster printer for printing data on a document, frame buffer memory means for providing variable digital data width data bus to said raster printer wherein said video data corresponds to the data to be printed on said document, control means having a certain data width data bus for controlling said variable data widths, wherein said variable data width is at least twice the width of said certain data width, said control means further including shift register means for interfacing to said raster printer.
Claim 13
Dependent Claim
94 words
In a raster printer controller system including a large printer for printing data on a document, the apparatus comprising frame buffer memory means for providing variable digital video data width data bus to said raster printer wherein said video data corresponds to the data to be printed on said document, control means having a certain data width bus for controlling said variable data widths, wherein said variable data width is at least twice the width of said certain data width, said control means further including shift register means for interfacing to said raster printer.
Claim 14
Dependent Claim
94 words
In a raster printer controller system including a large printer for printing data on a document, the apparatus comprising frame buffer memory means for providing variable digital video data width data bus to said raster printer wherein said video data corresponds to the data to be printed on said document, control means having a certain data width bus for controlling said variable data widths, wherein said variable data width is at least twice the width of said certain data width, said control means further including shift register means for interfacing to said raster printer.
References Cited (Backward Citations)
US4649516A
Cited
US4663729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |