Patent ID: 7154084

Claim:
An optical-scanning microscope apparatus comprising: a light source; a light-transmitting member for transmitting light from the light source; an apparatus main body for illuminating a subject with the light transmitted by the light-transmitting member, the apparatus main body including: a collimating optical system for converting the light transmitted by the light-transmitting member into collimated light; a first scanning mirror for deflecting the collimated light emitted from the collimating optical system at a deflection angle smaller than 90° to scan the light over the subject; a focusing optical system for focusing the light scanned by the first scanning mirror onto the subject; and a pupil-projection optical system disposed between the focusing optical system and the first scanning mirror; a photodetector for detecting return light returning from the subject via the apparatus main body and the light-transmitting member; and a second scanning mirror, wherein the first and second scanning mirrors are single-axis-scanning micromachined mirrors opposed to each other and constitute a proximity galvanometer mirror unit, and one of the first and second scanning mirrors is arranged on an optical path near the light source and the other of the first and second scanning mirrors is arranged on an optical path near the focusing optical system, the first and second scanning mirrors being disposed to satisfy a conditional expression: 0.5×(α+sin −1 ( r/ ( d 2 +w 2 /4) 0.5 ))≦θ<45° where θ is an incident angle at which light is incident on the one of the first and second scanning mirrors from the light source via the light-transmitting member, r is a beam radius, w is a width of the other of the first and second scanning mirrors, d is a distance between the first and second scanning mirrors, and α=cos −1 (d/d 2 +w 2 /4) 0.5 ).