| 摘要 |
<p>A mirror rotation angle detection mechanism is provided with a light emitting member therein to irradiate the light onto the reflection surface of a mirror which is rotated about an axis positioned substantially in the center of the reflection surface of itself. A light receiving element receives the light reflected by the reflection surface of the aforesaid mirror, and an angle detection circuit detects the rotation angle of the aforesaid mirror in accordance with the output of the aforesaid light receiving element. Preferably, a condenser lens may also be arranged between the aforesaid light emitting member and the aforesaid reflection surface. <IMAGE></p> |
