Vibrating device for axially vibrating a movable member

#The present invention relates to a vibrating device having an axially driven movable member, and more particularly to a vibrating device mounted in a portable telephone for signaling a user by vibration of the movable member.

#In recent years, there is popularized various portable instruments such as portable telephone, PDA (Personal Digital Assistant), wearable computing instruments and so forth. In these instruments, vibrating devices are mounted for informing signals, by vibration without producing sounds.

#FIG. 7 is a perspective view showing a conventional vibration device disclosed in Japanese Patent Laid Open 7-107699. A direct current motor 131 has a rotating shaft 136 supported by a bearing 133. There is formed an annular groove 135 on which an eccentric weight 134 is secured by a fixer 140.

#FIG. 1 is a sectional side view showing a first embodiment of the present invention;

#FIG. 2 is a sectional side view of a second embodiment of the present invention;

#FIG. 3 is a sectional side view showing a third embodiment of the present invention;

#FIG. 1 is a sectional side view showing a first embodiment of the present invention.

#A vibrating device 10 of the present invention comprises a cylindrical frame 11 made of a resin, a supporting shaft 29 axially movably mounted in the frame 11, a vibrating assembly 20 secured to the shaft 29, and a magnetic driving device 19 mounted in the frame 11.

#The vibrating assembly 20 comprises a cup-shaped yoke 21 secured to the shaft 29, a cylindrical permanent magnet 22 and a cylindrical pole piece 23 secured to the shaft 29, and a weight 28 secured to the outside of the bottom of the yoke 21.