US4933874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printer
Assignee: Ricoh Co Ltd
•
Filing: 1989-03-30
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Granted: 1990-06-12
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Expires: 2009-03-30
Abstract
Abstract A printer structure relies on a laser modulator operating in response to image data cooperates with a rotary deflector for deflecting the modulated laser onto a recording medium with the rotation of the rotary deflector being controlled by a predetermined signal. A synchronizer receives the deflected laser irradiated from the rotary deflector in the vicinity of the recording medium and the synchronizer outputs a signal which defines a timing which the laser modulator uses to begin modulation. At least three memories are used which are each capable of storing the image data corresponding to one line defined by one deflection of the rotary deflector and a memory control device controls the writing of the image data inputted from an exterior of the printer in one memory means after switching the one memory to a write operation in synchronization with the rotary signal defining the one line. Subsequently, the image data which is written in the particular one memory is read after switching the one memory to a read operation and transferring the read image data to the laser modulator.
Inventors
- 👤 Kenichirou Asada
- 👤 Yoshiki Yoshida
- 👤 Kazuo Murai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:36
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; G06K15/1219; Y; Y10; Y10S; Y10S347/00; Y10S347/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
192 words
A laser printer comprising: laser modulating means for modulating a laser in response to image data transferred thereto and for irradiating the modulated laser; rotary deflecting means for deflecting the modulated laser irradiated thereto from said laser modulating means onto a recording medium, a rotation thereof being controlled by a rotary signal supplied thereto in a predetermined period; synchronization detecting means for receiving the deflected laser irradiated thereto from said rotary deflecting means in the vicinity of said recording medium and outputting a synchronization signal defining a timing which said laser modulating means starts to modulate; at least three memory means each capable of storing the image data corresponding to one line defined by one deflection of said rotary deflecting means; and memory control means for writing the image data inputted from an exterior of said printer in one memory means after switching said one memory means to a write operation in synchronism to the rotary signal defining said one line, reading the image data written in said one memory means after switching said one memory means to a read operation, and transferring the read image data to said laser modulating means.
Claim 2
Dependent Claim
192 words
A laser printer comprising: laser modulating means for modulating a laser in response to image data transferred thereto and for irradiating the modulated laser; rotary deflecting means for deflecting the modulated laser irradiated thereto from said laser modulating means onto a recording medium, a rotation thereof being controlled by a rotary signal supplied thereto in a predetermined period; synchronization detecting means for receiving the deflected laser irradiated thereto from said rotary deflecting means in the vicinity of said recording medium and outputting a synchronization signal defining a timing which said laser modulating means starts to modulate; at least three memory means each capable of storing the image data corresponding to one line defined by one deflection of said rotary deflecting means; and memory control means for writing the image data inputted from an exterior of said printer in one memory means after switching said one memory means to a write operation in synchronism to the rotary signal defining said one line, reading the image data written in said one memory means after switching said one memory means to a read operation, and transferring the read image data to said laser modulating means.
Claim 3
Dependent Claim
27 words
A laser printer according to claim 1, wherein said printer further comprises rotary signal generating means disposed an exterior of said printer for generating the rotary signal.
Claim 4
Dependent Claim
27 words
A laser printer according to claim 1, wherein said printer further comprises rotary signal generating means disposed an interior of said printer for generating the rotary signal.
Claim 5
Dependent Claim
47 words
A laser printer according to claim 2 or 3, wherein said printer further comprises a first selecting means for sequentially selecting the one memory means to write the image data and a second selecting means for sequentially selecting the one memory means to read the image data.
Claim 6
Dependent Claim
42 words
A laser printer according to claim 4, wherein said printer further comprises means for selecting the one memory means by said second selecting means when the one memory means is simultaneously selected by said first selecting means and said second selecting means.
Claim 7
Dependent Claim
44 words
A laser printer according to claim 4, wherein said printer further comprises means for delaying an operation of said first selecting means in one time in which the one memory means is simultaneously selected by said first selecting means and said second selecting means.
Claim 8
Dependent Claim
212 words
A laser printer comprising: laser modulating means for modulating lasers in response to image data transferred thereto and for irradiating the modulated lasers; a plurality of rotary deflecting means for each deflecting the modulated laser irradiated thereto from said laser modulating means onto a recording medium, each rotation thereof being controlled by each of rotary signals supplied thereto in a predetermined period; a plurality of synchronization detecting means for each receiving the deflected laser irradiated thereto from the corresponding rotary deflecting means in the vicinity of said recording medium and each outputting a synchronization signal defining a timing which said laser modulating means starts to modulate; a plurality of memory means each capable of storing the image data corresponding to one line each defined by one deflection of each of said rotary deflecting means; and memory control means for each writing the image data inputted from an exterior of said printer in each of memory means after switching each of memory means to a write operation in synchronism to the rotary signal each defining the one line, each reading the image data written in each of said memory means after switching each of said memory means to a read operation, and each transferring the read image data to said laser modulating means.
Claim 9
Dependent Claim
212 words
A laser printer comprising: laser modulating means for modulating lasers in response to image data transferred thereto and for irradiating the modulated lasers; a plurality of rotary deflecting means for each deflecting the modulated laser irradiated thereto from said laser modulating means onto a recording medium, each rotation thereof being controlled by each of rotary signals supplied thereto in a predetermined period; a plurality of synchronization detecting means for each receiving the deflected laser irradiated thereto from the corresponding rotary deflecting means in the vicinity of said recording medium and each outputting a synchronization signal defining a timing which said laser modulating means starts to modulate; a plurality of memory means each capable of storing the image data corresponding to one line each defined by one deflection of each of said rotary deflecting means; and memory control means for each writing the image data inputted from an exterior of said printer in each of memory means after switching each of memory means to a write operation in synchronism to the rotary signal each defining the one line, each reading the image data written in each of said memory means after switching each of said memory means to a read operation, and each transferring the read image data to said laser modulating means.
Claim 10
Dependent Claim
29 words
A laser printer according to claim 7, wherein said printer further comprises rotary signal generating means disposed an exterior of said printer for generating each of the rotary signals.
Claim 11
Dependent Claim
29 words
A laser printer according to claim 7, wherein said printer further comprises rotary signal generating means disposed an interior of said printer for generating each of the rotary signals.
Claim 12
Dependent Claim
49 words
A laser printer according to claim 8 or 9, wherein said printer further comprises a first selecting means for sequentially selecting each of said memory means to write the image data and a second selecting means for sequentially selecting each of said memory means to read the image data.
Claim 13
Dependent Claim
41 words
A laser printer according to claim 10, wherein said printer further comprises means for selecting one memory means by said second selecting means when the one memory means is simultaneously selected by said first selecting means and said second selecting means.
Claim 14
Dependent Claim
44 words
A laser printer according to claim 10, wherein said printer further comprises means for delaying an operation of said first selecting means in one time in which the one memory means is simultaneously selected by said first selecting means and said second selecting means.
References Cited (Backward Citations)
US4809025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |