JPS587696Y2 - Kogataonsashindoushi - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a small tuning fork vibrator having stable characteristics against external shocks.

Generally, the vibration frequency f of a tuning fork vibrator.

The following relational expression holds true.

Here, = constant, l: length of the tuning fork body, d = thickness of the tuning fork body.

As is clear from the above equation, if the length of the tuning fork body is kept constant and the vibration frequency is to be lowered, the thickness of the tuning fork body can be made thinner.

Traditionally, smaller tuning fork vibrators are formed by punching a single metal plate in order to facilitate manufacturing, reduce costs, or omit welding work that can easily cause characteristic deterioration. This was normal, and the supporting legs of the tuning fork body were also formed integrally.

However, if the thickness is reduced in order to lower the vibration frequency, the thickness of the support leg will naturally become thinner, and the strength of the support leg will become weaker, meaning that it will not be able to adequately support the tuning fork body.

Therefore, if a strong external impact were to occur, the tuning fork would be unable to withstand the force and would deform, resulting in a large change in characteristics, and there was a limit to how thin the tuning fork body could be.

This idea is an attempt to solve the above-mentioned drawbacks.Protrusions are formed integrally with the tuning fork at both ends in the width direction of the tuning fork at the center of the base of the tuning fork, and one of the protrusions is separated from the base of the tuning fork. By detouring the protruding piece and bending it so as to overlap the other protruding piece, and using the protruding piece as a support leg of the tuning fork, it is possible to provide a tuning fork vibrator that is strong against external shocks.

This invention will be described in detail below according to an illustrated embodiment.

In FIG. 1, reference numeral 1 denotes a tuning fork body formed by punching a single metal plate.

2 and 3 are piezoelectric elements affixed to the joints of the tuning fork body 1; 4 are supporting legs of the tuning fork body 1, which protrude integrally from the center of the base of the tuning fork body 1, and are placed at opposite positions with the tuning fork body 1 in between; One of the two protruding pieces 4a and 4b is detoured away from the base of the tuning fork, and the other protruding piece 4a is removed.
It is bent and joined so that it overlaps with the .

FIGS. 2 and 3 show other embodiments of this invention, in which the projecting piece 4
b are folded in different directions and overlapped on the protruding piece 4a.

Note that other constituent parts are the same as those in the above-described embodiment, and are therefore designated by the same numbers.

In each of the embodiments described above, by providing a metal layer on the support leg through plating that is easy to solder, the external lead wire can be directly soldered to the support leg, improving workability.

In this case, not only the support legs but also a part or all of the tuning fork body may be plated to form a metal layer that is easy to solder.

In this case, it is also possible to solder the piezoelectric element.

As is clear from the above embodiments, according to this invention, protrusions are formed integrally with the tuning fork at both ends in the width direction of the tuning fork at the center of the base of the tuning fork, and one protrusion is separated from the base of the tuning fork. The protruding piece is bent around the other protruding piece and used as the support leg of the tuning fork, so even if the tuning fork body is made thinner in order to obtain a lower vibration frequency, the supporting leg itself is reinforced and is able to withstand external shocks. It will not be deformed by

Therefore, a highly reliable tuning fork vibrator can be provided at low cost, and since it can be formed from a single metal plate, its manufacture is simple.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of this invention, and FIGS. 2 and 3 are perspective views showing other embodiments of this invention. 1-tuning fork body, 2, 3-piezoelectric element, 4-support leg, 4a,
4b-projection piece.

Claims (1)

[Scope of utility model registration request] At the center of the base of the tuning fork, protrusions are formed integrally with the tuning fork at both widthwise ends of the tuning fork, one protrusion is separated from the base of the tuning fork, the protrusion is detoured, and the protrusion is bent so as to overlap the other protrusion. A small tuning fork vibrator characterized by using protrusions as support legs of the tuning fork.