| 摘要 |
An apparatus and method are disclosed for testing the faces of a polygon mirror for angular inclination and flatness while the polygon mirror is rotating at its intended operating speed. The apparatus includes an autocollimator for making the test readings, a strobe light for supplying light in the form of pulses to the autocollimator and a control mechanism including a laser, a light detector, a counter and a momentary contact switch for controlling the timing of the light pulses emitted by the strobe light so that the faces of the polygon mirror can be tested, one face at a time. The apparatus further includes a fiber optic probe which illuminates a unique number imprinted on the face illuminated through the autocollimator with light pulses directly from the strobe light so that the face that is being illuminated can be identified. Angular inclination is tested by observing the displacement of the light beam reflected by the face being tested relative to the outgoing beam and flatness is tested by observing the focus of the reflected beam.
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