Image forming apparatus

Details Image forming apparatus Image forming apparatus

1992-10-15

1996-05-14

Roskoski, Bernard

Facsimile and static presentation processing

Facsimile

Recording apparatus

347254, H04N 121

Patent

active

055173187

ABSTRACT:
Although three resolutions of 600 SPI, 300 SPI and 150 SPI are available, a host apparatus 1 applies data D to line buffers 3 and 4 at a video rate determined by the resolution of 600 SPI. The data stored in the line buffers 3 and 4 are read with clock signals outputted by data writing and reading control sections 5 and 6, and are applied through a multiplexer 7 to a laser beam source 8 in a printer. In the case where the resolution specified is 300 SPI, the control sections 5 and 6 read the data with a clock signal whose period is twice as long as that which is employed in the case where the resolution is 600 SPI; and in the case where the resolution specified is 150 SPI, they read the data with a clock signal whose period is four times as long. Furthermore, in the case where the resolution is 300 SPI, one and the same data is read as much as two lines in succession; and in the case where the resolution is 150 SPI, one and the same data is read as much as four lines in succession.

REFERENCES:
patent: 5123082 (1992-06-01), Shimada
patent: 5194879 (1993-03-01), Kotabe et al.
patent: 5241329 (1993-08-01), Guerin

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