Laser Beam Printer - Rotational Jitter of the Mirror, Accuracy of mirror surface, Fixed accuracy of Polygon scanner mirror

Rotational Jitter of the mirror/Accuracy of mirror surface

The reflection at the point A on a mirror surface is detected by Detector A, and the other reflection at point B on the same surface is detected by Detector B.
Rotational jitter of the motor, which is fixed with polygon mirror, is evaluated with a Time-interval measurement (A to B) using the TA320. Transient analysis of motor is available using the time variation display of the TA320.

TA320 Setting

• Function : Time interval
• Display : Time variation
  

Example

Long term jitter indicates rotational jitter of the motor.
Short term jitter measures the data from one rotation of the mirror, so the deviation made by each surface distortion can be evaluated.

Fixed accuracy of Polygon scanned mirror

Set up

If the Polygon scanner mirror is fixed with any tilt, the reflected laser beam through the V-slit is modulated by the tilt.
TA320 can analyze the tilt by measuring the pulse width.

TA320 Setting

• Function : Pulse width