JPS5821216Y2 - Support structure of small piezoelectric vibrator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for an indenter vibrator such as a small crystal.

Conventional small crystal oscillators, as shown in Fig. 1 (A) 9 and Fig. 2 (A) 9, are all conventional examples of tuning fork type crystal oscillators A.
support lead terminal B of the same vibrator A, and electrode lead terminal C of the same vibrator A.
was necessary.

Moreover, the above-mentioned support lead terminal B has a tuning fork type crystal oscillator A.
In order to provide vibration resistance, parts such as springs were used, which was disadvantageous for miniaturization, and there was a risk of slight frequency shifts due to incomplete vibration resistance. Ta.

Furthermore, if the number of parts is large as described above, the assembly method becomes difficult, resulting in disadvantages such as requiring a long time for assembly.

In particular, piezoelectric vibrators used in wristwatches, etc. are required to be extremely small, and by etching technology,
Plate thicknesses up to 0.00 μm have been manufactured and actually installed.

There is also a demand for smaller packages, but there is still no satisfactory package, and as shown in Figures 1 and 2, packages with three lead terminals are extremely small Penetrate the sealing insulator (plug) of the diameter (
Its disadvantages include poor workability, such as difficulty in connecting the three terminals to the electrodes of the vibrator, while keeping the three terminals separated from each other by an appropriate distance.

The present invention aims to solve the above-mentioned drawbacks, and will be described in detail with reference to the illustrated embodiments. 1 is a case, 2 is a sealing insulating material such as glass, and 3 is a base.

4a and 4b are lead terminals, 5 is a tuning fork type crystal resonator;
a is the base, 5b is the tuning fork part, (ia, 6b is the electrode).

In Figures 3a and 3b, the lead terminals for electrically connecting the external circuit and the electrodes of the crystal resonator penetrate the sealing insulating material 2, and are composed of only two terminals 4a and 4b. ing.

Electrodes are formed on the tuning fork type crystal oscillator 5, and the electrode on the plane having two forks consists of an electrode 6a arranged on one fork and an electrode 6b arranged on the other fork. extends to the vicinity of the lower end of the tuning fork base 5a, and is divided approximately at the center of the tuning fork base 5a.

The distance between the two parallel lead terminals 4a and 4b is determined so as to correspond to the electrodes 6a and 6b near the lower end of the tuning fork base.

To attach the tuning fork type crystal resonator 5, connect the upper surface of the tuning fork base 5a of the resonator with the two lead terminals 4a and 4b.
The bottom surface of the tuning fork base is positioned by a sealing insulating material, and the lead terminals 4a, 4b and the electrode 6a near the lower end of the tuning fork base are positioned.

6b and conductive adhesive 7a such as solder, respectively.

7b, it may be directly fixed.

Note that the bottom surface of the tuning fork base 5a and the sealing insulating material 2 may be installed separately without contacting each other, but it is easier to work if they are in contact with each other, and the impact resistance of the vibrator and lead terminals is improved. It is also more preferable.

The tuning fork type vibrator unit according to the present invention not only has a very simple structure with a small number of parts as described above, but also has the following advantages.

(1) Since it consists of only two lead terminals, attaching the vibrator can be done in one step: placing the vibrator base on the two lead terminals with pre-soldered tips and heating them. This greatly improves work efficiency.

(2) Compared to the conventional three-terminal type, it is easier to separate the lead terminals through the sealing insulating material for a predetermined distance, and it is also possible to use lead wires that are thicker than the three-terminal type. Therefore, it has excellent impact resistance.

(3) Since the structure is such that two lead terminals are fixed to one plane of the vibrator, the vibrator can be made thinner and smaller than a structure in which the vibrator is supported by sandwiching the lead terminals.

(4) Extending the electrode on one plane to the vicinity of the lower end of the tuning fork base,
Since the structure has electrodes divided approximately at the center of the base, connection with lead terminals is extremely easy, and the electric field at the tuning fork base can be directed in the width direction of the vibrator.
This promotes expansion and contraction of the vibrator in the length direction, lowering the crystal impedance of the vibrator,
It becomes possible to improve the Q value.

(5) If the bottom surface of the tuning fork base is configured to abut against the sealing insulating material, workability and impact resistance are further improved.

4 and 5 show other examples in which the vibrator is directly fixed by two lead terminals, and both have a structure in which the vibrator is sandwiched between the two lead terminals.

Therefore, although it has excellent impact resistance, it is inferior to the embodiment shown in FIG. 3 in terms of workability and size reduction.

[Brief explanation of the drawing]

Fig. 1, 9, and 9, and Fig. 2, each is an example of a heterogeneous embodiment showing the support structure of the conventional small crystal vibrator. Figure 4 is a vertical cross-sectional view and a cross-sectional view respectively showing an embodiment of a small piezoelectric vibrator according to the present invention. This shows another example of fixation, where A is a longitudinal cross-sectional view and the opening is a cross-sectional view. 1...Case, 2...Insulating material for sealing,
4a, 4b...Lead terminal, 5...Tuning fork type crystal resonator, 5a. 6b... Electrode, 7a, 7b... Conductive adhesive.

Claims (1)

[Claims for Utility Model Registration] In a support structure for a small piezoelectric vibrator that supports a tuning fork type piezoelectric vibrator in the same direction as a lead terminal, an electrode 6a disposed on one fork on a plane having two forks and the other The electrodes 6b arranged on the fork are extended to the vicinity of the lower end of the tuning fork base 5a, and the electrodes are divided approximately at the center of the tuning fork base 5a, and two lead terminals 4 penetrate through the sealing insulating material 2.
One and the other electrodes 6a extend to the vicinity of the lower end of the tuning fork base, with the electrodes 6a and 4b on the same plane. 6b for electrical connection and support of the vibrator, and is arranged so that the bottom surface of the tuning fork base abuts the sealing insulating material 2.