Patent ID: 8422107
Filing Date: 2013-04-16
Classification: G02B,G09G,H04N

Abstract:
1. An optical scanning device comprising: an optical scanning element which has a reflection mirror and is configured to perform reciprocating scanning of an optical flux radiated from a light source by resonance oscillations of the reflection mirror; a photo detector which is arranged at a position which a portion of the optical flux scanned by the optical scanning element in a reciprocating manner passes in both outgoing-path scanning as well as in incoming-path scanning, and is configured to output a pulse signal having a predetermined width at a point of time that the scanned optical flux is detected; and a reference signal generator which is configured to generate a reference signal which becomes the reference for radiation timing of the optical flux from the light source corresponding to a detection result of the optical flux by the photo detector, wherein the reference signal generator is configured either (1) to detect a timing interval between rising edge timing of a first pulse signal out of two pulse signals continuously outputted from the photo detector and falling edge timing of a second pulse signal out of the two pulse signals continuously outputted from the photo detector, and to generate the reference signal at a point in time after lapse of half the timing interval from the rising edge timing of the pulse signal outputted next from the photo detector, or (2) to detect a timing interval between falling edge timing of a first pulse signal out of the two pulse signals continuously outputted from the photo detector and rising edge timing of a second pulse signal out of the two pulse signals continuously outputted next from the photo detector, and to generate the reference signal at a point in time after lapse of half the timing interval from the falling edge timing of the pulse signal outputted next from the photo detector.