Vibrating element, optical scanning device, and image forming device and image projection device using same

Abstract

This vibrating element (17) includes a torsion bar (23) having a basal end fixed to a base (20), and a plate-shaped oscillating member (22) fixed at a position separated from one end of the torsion bar, which protrudes from the base, and having a light reflection surface (21) that reflects light (L) emitted from a light source (13), wherein: the oscillating member oscillates about the lengthwise axis (A) of the torsion bar while being accompanied by the elastic deformation of the torsion bar, and swings the light, which has been reflected by the light reflection surface, in a direction that intersects with the lengthwise axis of the torsion bar; the oscillating member includes two plate members (29, 30) that are joined together with the torsion bar sandwiched therebetween; the two plate members have respective receiving grooves (29b, 30b) that receive the torsion bar and that are formed in the respective joining surfaces (29a, 30a); and the plate members have a symmetrical shape with respect to the lengthwise axis of the torsion bar which serves as the axis of symmetry.

Description

technical field [0001] The present invention relates to a vibrating element and an optical scanning device utilizing resonance of a torsion bar, and an image forming device and an image projection device incorporating the optical scanning device. Background technique [0002] Patent Document 1, Patent Document 2, etc. propose an optical scanning device that uses resonance of an oscillating system to oscillate the mirror at high speed in place of a rotating mirror such as a polygon mirror used in an optical scanner, thereby allowing light to travel. scanning. Patent Document 3 also proposes a oscillating body device, a potential sensor, and the like having the same principle. [0003] Generally, such an optical scanning element as a vibrating element for constituting an optical scanning device or a potential sensor includes: a plate-shaped oscillating body; a torsion bar for fixing the oscillating body; The body swings around the lengthwise axis of the torsion bar. In addi...

AI Technical Summary

Problems solved by technology

However, since the common center of gravity between the fixed member and the magnet engaged with the fixed member is away from the central axis of the torsion bar, the light reflecting surface formed on the surface of the magnet sometimes vibrates abnormally, thereby making it impossible to direct the light to the desired direction. to scan

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