| 摘要 |
Scan distortion is eliminated in a light beam positioner utilizing a first mirror for deflecting a light beam in a first direction in response to a first compensated control signal. A second mirror receives the light deflected from the first mirror and, in response to a second compensated control signal, deflects the received light beam at a second angle in a second direction which is orthogonal to the first direction. An objective lens is provided for focussing the deflected light beam produced by the second mirror. A controller means generates first and second uncompensated control signals which are respectively proportional to the first and second angles of deflection. A scan distortion compensating circuit generates first and second intermediate signals which are respectively dependent on the first and second uncompensated control signals. The compensating circuits substracts the first intermediate signal from the first uncompensated control signal to generate the first compensated control signal, and adds the second intermediate signal to the second uncompensated control signal to generate the second compensated control signal. Drive means is provided for driving the first and second beam scanning means in response to the first and second compensated control signals, respectively.
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