| 摘要 |
PURPOSE:To thin the titled device by providing a gas bearing part for generating the dynamic pressure of gas by the rotation of a rotary body, and supporting the axial direction of a rotary member and its inclination in a state of non- contact, between a base plate and a plane part of the rotary member. CONSTITUTION:A rotary body supporting device in an optical reflector is provided with a plane part of a rotary member 51 for holding a rotary body containing a rotary polyhedron mirror 52, and a dynamic pressure gas bearing for generating the dynamic pressure by the rotation between plane parts of a base plate 61 placed so as to be opposed to its plane part and supporting the rotary member 51 in a state of non-contact. Also, in the radial direction of the rotary member 51, a control member for supporting mainly its unbalanced force, for instance, a fixed axis 60 is provided. Accordingly, by the dynamic gas bearing part, the rotary member is supported in the axial direction, and also, its inclination can be held simultaneously. In such a way, the rotary body supporting device can be thinned remarkably, and also, a rotary polyhedron mirror optical deflector which is applied this device is thinned and miniaturized, as well. |
