Edge placement device

Details Edge placement device Edge placement device

2000-01-26

2001-05-22

Le, N. (Department: 2861)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S235000, C347S250000, C327S153000, C327S161000, C327S276000, C327S291000

Reexamination Certificate

active

06236427

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to modulation of a pulse width. More particularly, this invention relates to controlling the positioning of one or more transitions during a period of time.
BACKGROUND OF THE INVENTION
In an imaging device, such as an electrophotographic printer, copier, or fax machine, that uses a scanning device to expose a photoconductor, imaging data is used to control the application of current to a laser diode to form a latent electrostatic image on the surface of the photoconductor. The laser diode generates a beam that is swept across the surface of the photoconductor. The generation of high quality images can be accomplished by precisely controlling exposure of the photoconductor. The image is quantized into pixels that have a dimension in the direction the beam moves across the surface of the photoconductor. Increasing image quality can be accomplished by decreasing the minimum quantization size of the area developed onto the photoconductor for the dimension of the developed area in the direction the beam is swept across the surface of the photoconductor. In addition to decreasing the minimum quantization size of the area developed, increased image quality is also accomplished by precisely controlling the positioning of the developed area with respect to the direction the beam is swept across the surface of the photoconductor. Decreasing the minimum quantization size can be accomplished by decreasing the minimum time period that the laser diode can be turned on during a sweep across the surface of the photoconductor. A need exists for a method and apparatus that will permit a decrease in the minimum laser on time period while precisely positioning the corresponding developed area on the surface of the photoconductor.
SUMMARY OF THE INVENTION
Accordingly, in an imaging device, an edge placement device to generate a transition has been developed. The edge placement device includes first edge placement logic configured to generate a first plurality of outputs using a first plurality of signals and a first data phase. The edge placement device also includes second edge placement logic configured to generate a second plurality of outputs using a second plurality of signals and a second data phase. Additionally, the edge placement device includes transition logic configured to generate the transition using the first plurality of outputs and the second plurality of outputs.
In an imaging device, a method for generating a plurality of transitions, includes generating a first plurality of logic values using a first predetermined value. The method also includes generating a first group of the plurality of transitions, according to the first plurality of logic values, after a first clock changes state in a first cycle of a second clock. Furthermore, the method includes generating a second plurality of logic levels using a second predetermined value. Additionally, the method includes generating a second group of the plurality of transitions, according to the second plurality of logic values, after a third clock changes state in a second cycle of the second clock, where the first clock and the third clock change states in alternate cycles of the second clock.
An electrophotographic imaging device for forming images using print data includes a photoconductor and a rasterizer to generate pixel data corresponding to the print data. The electrophotographic imaging device further includes pulse code logic to generate a first data phase and a second data phase from the pixel data. Additionally, the electrophotographic imaging device includes an edge placement device to generate video data using the first data phase, the second data phase, a first clock phase, and a second clock phase. Also, the electrophotographic imaging device includes a photoconductor exposure system for forming a latent electrostatic image on the photoconductor corresponding to the video data.


REFERENCES:
patent: 5212716 (1993-05-01), Ferraiolo et al.
patent: 5477330 (1995-12-01), Dorr
patent: 5793709 (1998-08-01), Carley
patent: 5990923 (1999-11-01), Morrison

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