| 摘要 |
There is provided an angular deviation state detection apparatus which detects the deviation state of a movable portion which can deviate, and has a detection portion for detecting a predetermined angular deviation component of the movable portion without being influenced by a deviation component of the movable portion, which is different from the predetermined angular deviation component. More specifically, a sensor which is constituted by light-emitting means for emitting a collimated light beam, and light-receiving means for receiving light emitted from the light-emitting means is adopted, or the deviation state of a specific portion, which is a portion of the movable portion and substantially does not cause the angular deviation component upon generation of the different deviation component, is detected. With this arrangement, the angular deviation state of the movable portion can be accurately detected.
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