| 摘要 |
Optical scanner with a light beam reciprocated parallel to itself includes a stationary inlet for the light beam, an elongated first prism having a parallelogram shape disposed downstream from the stationary inlet in travel direction of the light beam, the first prism extending transversely to the light beam and having an inlet end through which the light beam is admitted to the first prism and twice reflected therein, the first prism having an outlet end from which the light beam leaves the first prism in a direction parallel to the direction in which it is admitted through the inlet end to the first prism, a second prism similar to the first prism having an inlet end disposed downstream of the outlet end of the first prism in travel direction of the light beam, the second prism having an outlet end determining respective location for the light beam leaving the scanner during a scanning operation, a first rotating carrier for the first prism having a mathematical rotary axis extending in the same direction as that of the light beam being admitted to the first prism through the inlet end of the first prism, and a second carrier rotating at the same rotary speed as the first carrier and counter thereto, the second carrier having a mathematical rotary axis extending in the same direction as that of the light beam leaving the first prism through the outlet end of the first prism and rotating together with the outlet end of the first prism about the rotary axis of the first rotating carrier.
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