New Function; Image Control ( Quantum Technology ) - Panasonic FP-7742 Service Manual

Section II

New Function

2. 1 Image Control (Quantum
• Even if the toner density is at it's standard level, the copy image may vary with
time depending on the characteristics of drum and the environmental variations.
To prevent this change, the copy density sensor which is installed under the
developer unit controls the image to stablize the copy image.
• Controlling the image
During initialization after turning on the power, the copy density sensor reads the
white density, medium density (line pattern density patch) and black density
developed on the drum surface.These three values are compared with the ideal
gamma curve stored in the copiers memory.
The copier detects the amount offset from the standard gamma curve (such as "a
little background" or "light image") and calculates the variables for copy density
control in accordance with Quantum
compensation values to tighten the gamma curve for maintaining peak copy quality.
By means of this process, copy quality is stabilized by the various compensations
enabled by Quantum adjustment in image production.
• The control of the gamma curve stabilizes copy quality by monitoring three points
of copy quality (white density, medium density and black density) and has a direct
effection on background, solid area density and good reproduction of fine lines
regardless of environmental changes and variation with time and copy volume.
TM
• Quantum Technology
Quantum TM Technology is adaptive control on the basis of quantative reasoning
theory. While successively reasoning and learning the change of process
characteristics regardless of environmental changes and the variations with time
and the number of copies on the copier, the system reads the patch marks and
determines the best values of exposure and surface potential to establish the
best gamma curve for optimum copy quality.
TM
Technology)
TM Technology. In this way it finds the optimum
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