| 摘要 |
In a deflection scanning optical system, a single first mirror is arranged between a laser beam source and a surface to be scanned. The first mirror has a first reflecting section, a second reflecting section and a transparent section. The laser beam from the laser beam source is reflected by the first reflecting section. A second mirror is provided for reflecting the laser beam reflected by the first reflecting section, toward the second reflecting section. The second mirror also reflects the laser beam reflected by the first reflecting section to transmit the reflected laser beam through the transparent section, thereby directing the transmitted laser beam toward the surface to be scanned. A detector received the laser beam reflected by the second mirror toward the second reflecting section and reflected by the same, for detecting a scanning position of the laser beam with respect to the surface to be scanned.
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