Optical: systems and elements – Deflection using a moving element – By moving a reflective element
Reexamination Certificate
2008-01-22
2010-10-26
Cherry, Euncha P (Department: 2872)
Optical: systems and elements
Deflection using a moving element
By moving a reflective element
Reexamination Certificate
active
07821694
ABSTRACT:
The present invention properly adjusts a resonance frequency of an optical scanner. A resonance-type optical scanner includes a reflection mirror which reflects incident light, a first beam portion which is connected to one side of the reflection mirror, a second beam portion which is connected to the other side of the reflection mirror, and first piezoelectric element portions for elastically deforming the first beam portion. By applying a DC voltage component to the first piezoelectric element portions of the resonance-type optical scanner, tension of the first beam portion and tension of the second beam portion are changed. In response to the changes of tensions of the first beam portion and the second beam portion, the resonance frequency of the optical scanner is changed. In a state that a DC voltage component is applied to the first piezoelectric element portions, an AC voltage is applied to the first piezoelectric element portions so as to oscillate the reflection mirror of the optical scanner at a predetermined frequency.
REFERENCES:
patent: 6449079 (2002-09-01), Herrmann
patent: 7203394 (2007-04-01), Wiegele et al.
patent: 2005/0219674 (2005-10-01), Asai et al.
patent: A-07-174569 (1995-07-01), None
patent: A-07-181415 (1995-07-01), None
patent: B2-2981600 (1999-09-01), None
patent: A-2004-191953 (2004-07-01), None
patent: A-2005-181477 (2005-07-01), None
patent: WO 2005/059624 (2005-06-01), None
Muralt et al., “Piezoelectric actuation of PZT thin-film diaphragms at static and resonant conditions,”Sensors and Actuators, vol. 53, 1996, pp. 398-404.
Guirardel et al., “PZT polarization voltage effects on off-centered PZT patch actuating silicon membrane,”Sensors and Actuators, vol. 110, 2004, pp. 385-389.
Wang et al., “Effect of DC bias field on the complex materials coefficients of piezoelectric resonators,”Sensors and Actuators, vol. 109, 2003, pp. 149-155.
Brother Kogyo Kabushiki Kaisha
Cherry Euncha P
Oliff & Berridg,e PLC
LandOfFree
Optical scan device, image display device, method of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical scan device, image display device, method of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical scan device, image display device, method of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4213006