US 9,810,903 B2
Optical scanner
Sueo Ueno, Shizuoka (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA TEC KABUSHIKI KAISHA, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Minato-ku, Tokyo (JP); and TOSHIBA TEC KABUSHIKI KAISHA, Shinagawa-ku, Tokyo (JP)
Filed on Jul. 28, 2015, as Appl. No. 14/810,707.
Prior Publication US 2017/0031155 A1, Feb. 2, 2017
Int. Cl. G02B 26/10 (2006.01); G03G 15/043 (2006.01); G02B 26/08 (2006.01)
CPC G02B 26/105 (2013.01) [G02B 26/0833 (2013.01); G03G 15/043 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An optical scanner, comprising:
a light source comprising a light emitting unit and a light receiving unit, the light emitting unit configured to emit and the light receiving unit configured to detect a light beam;
a MEMS mirror having a reflecting surface for reflecting the light beam when the light beam is emitted in a direction vertical to the reflecting surface and when the reflecting surface faces toward the light emitting unit;
a drive unit configured to control a drive current applied to the light emitting unit by setting a light quantity of the light beam received by the light receiving unit to a specific value; and
a control section configured to compare the drive current with a given threshold and to determine whether the drive current is below the given threshold to allow for determining whether or not the MEMS mirror is positioned at a specific position.