Piezoelectric resonator for oscillator and surface mount type piezoelectric oscillator

Abstract

A piezoelectric resonator for an oscillator contained in an upper concave portion of an insulating case that has a metal lid with which the upper concave portion is air-tightly closed comprises a GND electrode being conductively coupled to an earth pattern of the piezoelectric resonator and provided on an outer bottom face of the insulating case, a piezoelectric connecting electrode being conductively coupled to an excite electrode of the piezoelectric resonator and provided on the outer bottom face of the insulating case, and an adjustment electrode being conductively coupled to the metal lid and provided on the outer bottom face of the insulating case in such a way that a regulator circuit in an IC part conductively contacts with the adjustment electrode if the IC part including the oscillation circuit is attached to the outer bottom face of the insulating case, wherein the metal lid serves as an adjustment terminal.

Description

[0001]This is a Division of application Ser. No. 11 / 984,082 filed Nov. 13, 2007, which is a Division of Ser. No. 11 / 471,711 filed Jun. 21, 2006 now U.S. Pat. No. 7,468,574. The entire disclosures of the prior applications are hereby incorporated by reference herein in its entirety.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present invention relates to a piezoelectric resonator for an oscillator and a surface mount type piezoelectric oscillator with which an inconvenience of adjustment work by using a small adjustment terminal provided on a side of a package is eliminated.[0004]2. Related Art[0005]In a mobile communication market, many manufactures of mobile terminal devices promote modularization of parts and components by their functions in consideration of assembly designs, maintenance and handleability of the electric components and compatibility of the components among devices. At the same time, there are strong requests for downsizing of the devices and low ma...

AI Technical Summary

Benefits of technology

[0013]An advantage of the present invention is to provide a surface mount type piezoelectric oscillator integrated with an IC part including an oscillation circuit and the like. The IC part is provided outside the package of the piezoelectric resonator. In the piezoelectric oscillator, a metal lid that used to be grounded is utilized as the adjustment terminal. Accordingly, the adjustment work becomes efficient, the problem of the downsizing of the oscillator is solved, and the adjustment work performed by the assembly company can also become easier. The advantage of the present invention is also to provide a piezoelectric resonator for an oscillator thereof.

[0014]According to a first aspect of the invention, a piezoelectric resonator for an oscillator contained in an upper concave portion of an insulating case that has a metal lid with which the upper concave portion is air-tightly closed, includes a GND electrode being conductively coupled to an earth pattern of the piezoelectric resonator and provided on an outer bottom face of the insulating case, a piezoelectric connecting electrode being conductively coupled to an excite electrode of the piezoelectric resonator and provided on the outer bottom face of the insulating case, and an adjustment electrode being conductively coupled to the metal lid and provided on the outer bottom face of the insulating case in such a way that a regulator circuit in an IC part conductively contacts with the adjustment electrode if the IC part including the oscillation circuit is attached to the outer bottom face of the insulating case, wherein the metal lid serves as an adjustment terminal.

[0015]In this case, a whole upper face of the metal lid may be used as the adjustment terminal if the adjustment electrode is single.

[0016]Moreover, an upper face of the metal lid may be comparted into a number of areas if the adjustment electrode is provided in the plural number, the number of the comparted areas of the metal lid is same as the number of the adjustment electrode, and each comparted area serves as an independent adjustment terminal.

[0017]According to a second aspect of the invention, a surface mount type piezoelectric oscillator includes the above-mentioned piezoelectric resonator.

[0018]According to the first aspect of the invention, in the surface mount type piezoelectric oscillator integrated with the IC part (IC part unit) including the oscillation circuit and the like provided on the bottom of the package of the piezoelectric resonator, it is possible to utilize the metal lid that used to be grounded for shielding as the adjustment terminal. Accordingly, the adjustment work can be performed more efficiently and the problem that hampers the downsizing of the oscillator is solved. Furthermore, the adjustment work performed by the assembly company can also become easier in the case where the assembly company buys only the piezoelectric resonator and assembles it into the oscillator.

Problems solved by technology

Accordingly, the adjustment work with a probe becomes extremely delicate and an inefficient work.

Moreover, the size of the adjustment terminal 110 cannot be made further smaller because a sufficient area with which the probe contacts has to be secured.

This also puts a limit on the size of the oscillator, and this becomes a problem when there is a request for a smaller size oscillator.

In this case, if the adjustment work is conducted by making the probe contact with the adjustment terminal provided on the side of a device such as a cellular phone after the completed oscillator is embedded in the device, it could be difficult to perform the adjustment work in such a way that other parts around the terminal provided on the side of the product hamper the work.

In this way, the adjustment work could become difficult depending on layouts.

This space becomes a problem when the device is needed to be downsized.

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