JPH0657342B2 - Vibration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vibrating device used for pagers and the like.

[Prior Art and Problems Thereof] Some vibration devices used for pagers or the like have a weight with an eccentric center of gravity fixed to a shaft of a motor and generate vibration by rotation of the motor. However, it is difficult to reduce the thickness of the above-mentioned vibration device because the thickness increases due to the rotation space of the weight fixed to the shaft of the motor or the size of the motor.

[Object of the Invention] Therefore, an object of the present invention is to provide a vibrating device that can be made thin.

[Means for Achieving the Object] In order to achieve the above object, the vibrating device of the present invention includes a pair of vibrating arms extending parallel to each other, and a plate connected between one end portions of the vibrating arms. A spring, a longitudinal vibration type piezoelectric element connected between the other ends of both the vibrating arms, and a fulcrum portion that integrally projects from the inside of each of the vibrating arms at a position close to the piezoelectric element. A mounting part in which both fulcrums are connected, a guide shaft standing upright in parallel with the both vibrating arms in this mounting part, slidably fitted to the guide shaft and connected to the leaf spring. There is a weight.

[Operation] When a drive signal is supplied to the piezoelectric element, the piezoelectric element expands and contracts, and the expansion and contraction movement of the piezoelectric element vibrates the pair of vibrating arms. At this time, since the vibrating arm is connected to the mounting portion at a position close to the piezoelectric element, the vibration amplitude of the end portion of the vibrating arm on the leaf spring side is enlarged. The expanded spring vibrates the leaf spring and the weight.

[Embodiment] The details of the present invention will be described below with reference to an embodiment shown in the accompanying drawings.

In the figure, a leaf spring 2 is sandwiched between one end portions 1a, 1a of a pair of vibrating arms 1, 1 extending parallel to each other, and longitudinal vibration occurs between the other end portions 1b, 1b of the vibrating arms 1, 1. Type piezoelectric element 3 is connected. The fulcrums 4 and 4 that integrally project from the inside of the vibrating arms 1 and 1 at a position near the piezoelectric element 3 are connected to the mounting portion 5. Guide shafts 6 and 6 standing upright in parallel with the vibrating arms 1 and 1 are planted in the mounting portion 5. A weight 7 is slidably fitted to the guide shafts 6 and 6. Further, the weight 7 is connected to the central portion of the leaf spring 2 and the weight 7 on the opposite side of the weight 7 from the guide shafts 6, 6.

Next, the operation of the vibrating device according to the present invention having the above configuration will be described.

When a drive signal is supplied to the piezoelectric element 3, the piezoelectric element 3 expands and contracts due to longitudinal vibration, and this expansion and contraction movement is transmitted to the vibrating arms 1 and 1, and the displacement is enlarged at the one ends 1a and 1a. However, both ends of the leaf spring 2 held between the vibrating arms 1 and 1 are displaced in the lengthwise direction thereof, and the leaf spring 2 is then displaced.
Flexurally vibrates, and the weight 7 vibrates with a predetermined amplitude in conjunction with the vibration.

[Effects of the Invention] According to the vibrating device of the present invention described in detail above, the vibrating device can be configured to be extremely thin and compact. Therefore, a device in which the vibrating device is incorporated, for example, a pager is also extremely thin and compact. Can be configured to. Further, as compared with the conventional structure, since there is no rotating portion, friction loss is small and driving efficiency is high. Therefore, it can be driven with low power consumption.

[Brief description of drawings]

The drawings are perspective views showing an embodiment of a vibrating device according to the present invention. 1 ... Vibration arm, 2 ... Leaf spring, 3 ... Piezoelectric element, 4 ... Support point part, 5 ... Mounting part, 6 ... Guide shaft, 7 ... Weight.

Claims (1)

[Claims] 1. A pair of vibrating arms extending parallel to each other, a leaf spring connected between one ends of the two vibrating arms, and a longitudinal vibration connected between the other ends of the two vibrating arms. Type piezoelectric element, a fulcrum portion integrally projecting from the inside of each of the vibrating arms at a position close to the piezoelectric element, a mounting portion to which the both fulcrum portions are connected, and both vibrations to the mounting portion. A vibration device comprising a guide shaft standing upright in parallel with an arm, and a weight slidably fitted on the guide shaft and connected to the leaf spring.