| Patent application number | Description | Published |
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| 20100182667 | OPTICAL SCANNING APPARATUS AND IMAGE FORMING APPARATUS - An optical scanning apparatus that scans a light beam from a light source includes: a movable portion and a fixed portion. The movable portion includes: a rotating member, which is capable of rotating about a rotation axis being parallel with an optical axis of the light beam, has an open hole through which the light beam passes, and is provided with a first coil; and a mirror that is provided to the rotating member, electrically connected with the first coil, and reflects the light beam that passes through the open hole of the rotating member in a variable angle with respect to the optical axis of the light beam. The fixed portion includes: a magnetic member; and a second coil capable of supplying an electromagnetic field to the first coil. One of a part and a whole of the magnetic member is made of a magnetic material and the magnetic member serves as a magnetic core of the second coil. | 07-22-2010 |
| 20100253989 | MIRROR DEVICE DRIVE CONTROL APPARATUS AND PROJECTOR - A mirror device drive control apparatus adapted to perform drive control of a mirror device having a hysteresis characteristic, includes: a drive section adapted to drive the mirror device with a drive signal; a detection section adapted to detect a displacement of a movable section of the mirror device, and to generate and then output a detection signal corresponding to the detection; a control section adapted to perform control of a frequency of the drive signal so that the movable section is displaced in a predetermined range; and an abnormality detection section adapted to detect abnormal vibration of the movable section during the control by the control section, wherein the abnormality detection section detects, in response to change in frequency of the drive signal, a frequency of an envelope included in the abnormal vibration of the movable section as a beat frequency based on a detection signal of the detection section, and obtains a frequency of the drive signal for performing a restoration process of driving of the mirror device based on the frequency of the drive signal changed and the beat frequency. | 10-07-2010 |
| 20100253990 | MIRROR DEVICE DRIVE CONTROL APPARATUS AND PROJECTOR - A mirror device drive control apparatus adapted to perform drive control of a mirror device having a hysteresis characteristic, includes: a drive section adapted to drive the mirror device with a drive signal; a detection section adapted to detect a displacement of a movable section of the mirror device, and to generate and then output a detection signal corresponding to the detection; and a start-up processing section adapted to perform a start-up process of the mirror device, wherein the start-up processing section detects a frequency of an envelope included in abnormal vibration of the movable section as a beat frequency fb based on the detection signal of the detection section, obtains a predetermined frequency f | 10-07-2010 |
