VIBRATING ELEMENT, OPTICAL SCANNING DEVICE, ACTUATOR DEVICE, VIDEO PROJECTION APPARATUS, AND IMAGE FORMING APPARATUS

摘要

A work hardening treatment which decreases the Young's modulus, and an age hardening treatment which recovers or increases the Young's modulus decreased by the work hardening treatment are performed to form a vibrating portion, thereby attaining a vibrating element (30) advantageous in downsizing while ensuring desired fatigue characteristics and vibration characteristics. This downsizes, for example, an actuator device (1), an optical scanning device, a video projection apparatus, and an image forming apparatus.