JPS6123868Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a thin piezoelectric vibrator obtained by corrosion removal processing.

An object of the present invention is to simplify the electrode extraction structure of a thin piezoelectric vibrator.

In recent years, with the spread of electronic wristwatches, piezoelectric vibrators have also become cheaper and more compact at a rapid pace. However, thin piezoelectric vibrators formed in a hermetically sealed manner have been put into practical use. A conventional example of the electrode lead-out structure of such a piezoelectric vibrator is shown in FIG.

In FIG. 1, reference numeral 1 denotes an oscillating piece formed integrally with the frame, and is held between box-shaped cases 2 and 3. Reference numerals 4 and 5 designate lead-out electrodes formed on the case, which are electrically connected to the electrodes (not shown) of the oscillation piece 1 via side electrodes 6 formed on the side surfaces of the case by sputtering or the like.

Such a conventional electrode extraction structure requires a conductive means for connecting the electrode of the oscillation piece to the extraction electrode formed on the case. Therefore, after processing the outer shape of the case, it is necessary to form a metal film on the side surface of the case by plating or apply a conductive paste, which increases the cost.

The present invention solves the above-mentioned drawbacks, and an embodiment thereof is shown in perspective views in FIGS. 2 and 3. Third
The figure is a developed view. In the same figure, the present invention has frame 7.
Electrodes 11 and 12 extend from the oscillating piece 8 to the frame 7 of the piezoelectric vibrator, which is formed by rubbing an oscillating piece 8 integrally formed with the oscillating piece 8 between two box-shaped cases 9 and 10. The piezoelectric vibrator is a piezoelectric vibrator in which notches 13 and 14 are formed in the peripheral portions of the two box-shaped cases 9 and 10 corresponding to the electrodes 11 and 12, excluding the corner portions. In the same figure, box-shaped cases 9, 1
0 is made of crystal, glass, or the like, and the projected dimensions (shapes) of the external parts of the box-shaped cases 9 and 10 are formed to be almost the same as the frame 7. As described above, according to the present invention, it is possible to form the lead-out electrodes to the outside at the same time as forming the electrodes of the oscillating piece, so there is no need to form the lead-out electrodes in the case body, and a piezoelectric vibrator with a simple electrode lead-out structure can be obtained. Can be done.

FIG. 4 is a sectional view showing an example of mounting the piezoelectric vibrator of the present invention on a circuit board. In the same figure, 15,
15' is a circuit board, and the circuit board 15,1
Bonding leads 16, 16' are formed at 5'. In this example, using a bonding material such as solder,
A state in which electrodes 11 and 12 formed on the oscillation piece 8 and bonding leads 16 and 16' are bonded is shown.

According to the present invention, in a piezoelectric vibrator in which a frame surrounding an oscillating body is formed integrally with the oscillating body, and a flat box-shaped case is fixed to the upper and lower surfaces of the frame and hermetically sealed, the frame and the box-shaped case are The outer circumferential shape of the
At least one side of the box-shaped case has a concave cutout formed in the periphery of the box-shaped case to expose a part of the frame, and the lead-out electrode of the oscillation piece is arranged in the exposed part, and the lead-out electrode By using the electrode as an external lead-out electrode, the following effects are obtained.

(a) The frame of the oscillating piece and the outer periphery of the box-shaped case are almost the same, and the electrode extraction part is formed by a concave notch in the periphery of the box-shaped case except for the corners, so that almost the entire circumference is It is composed of three laminated parts, and part of the frame part that serves as the electrode extraction part is a single layer, but since the box-shaped case is formed with concave notches on the periphery except for the corner parts, the frame part The case can be reinforced on three sides near the electrode extraction part, and even a single layer has sufficient strength. Therefore, it is possible to provide a piezoelectric vibrator that is easy to handle and durable, without any possibility of breakage during operation.

(b) Since the electrode extraction part is formed by the frame surface exposed by the concave cutout of the box-shaped case, there is no need to route the electrodes to the case, and electrode placement inside and outside the case is easy. , has the advantage of simple structure.

[Brief explanation of the drawing]

FIG. 1 shows a conventional example of a piezoelectric vibrator, FIGS. 2 and 3 show an embodiment of the present invention, and FIG. 4 shows an example of mounting the piezoelectric vibrator of the present invention. 7... Frame, 8... Oscillation piece, 9, 10... Box-shaped case, 11, 12... Electrode, 13, 14... Notch, 15... Circuit board, 16... Bonding lead.

Claims (1)

[Scope of utility model registration request] In a piezoelectric vibrator in which a frame integrally formed with an oscillating piece surrounds the oscillating piece and is hermetically sealed by sandwiching the upper and lower surfaces of the frame between two flat box-shaped cases, the frame The outer circumferential shapes of the two box-shaped cases are almost the same, and
At least one of the two box-shaped cases is formed so as to expose a part of the frame by providing a concave cutout in the peripheral part excluding the corner part, and a drawer of the oscillation piece is provided in the exposed part of the frame. A piezoelectric vibrator characterized in that electrodes are arranged, and the lead-out electrode facing the concave notch is an external lead-out electrode.