JPH0435310A - Crystal resonator for surface mount - Google Patents

Abstract

PURPOSE:To improve the secular change characteristic by forming a step to an inner wall of a package main body, abutting one face at both ends of a crystal chip on the step, supporting the crystal chip with an elastic body interposed between a cover and other face of both ends of the crystal chip and connecting a lead electrode prolonged from the other face of both ends of the crystal chip to a conductor path (not shown) by bonding. CONSTITUTION:One side of an outer circumference of both ends of a crystal chip 1 is abutted on a step. Then a metallic elastic plate 8 is interposed between a cover 3 and the other side of the crystal chip 1 and the crystal chip 1 is fixed by seam welding. The elastic body 8 is processed in H-shape (plane view), the middle part is bonded in advance to the cover 3 and each leg 9 (abcd) is in press contact with four conners of the crystal chip 1. Moreover, a lead electrode 4 prolonged to an outer circumference of both ends of the other side of the crystal chip 1 is connected to a conductor path (not shown in figure) by bonding through a metallic thin wire 10. Thus, an organic material is eliminated from the inside of the package and the deterioration in the secular change characteristic such as change in the oscillating frequency is prevented.

Description

Detailed Description of the Invention (Industrial Field of Application) The field of the present invention is an ink resonator for surface mounting, and in particular, a crystal vibrator with good aging characteristics by removing organic substances such as polymer adhesives. Concerning children.

(Background of the invention) Quartz crystal resonators are useful as time or frequency reference sources, filter elements, etc. In recent years,
Surface-mountable devices are desired, as typified by chip devices such as resistors and capacitors.

(Prior art) I! FIG. 2 is a diagram illustrating the basic configuration of such a conventional example, where (a) is a cross-sectional view and FIG. 2 (b) is a diagram of a crystal piece.

The crystal resonator consists of a crystal piece 1, a container body 2, and a cover 3. The ink piece 1 is, for example, a rectangular AT cut, and counter electrodes 5 from which lead electrodes 4 extend are formed at both ends. The container body 2 is mainly a concave laminated ceramic body having a stepped portion, and a weld ring 6 is provided on the upper surface of the side wall. The weld ring 6 is formed by press working (punching). The cover 3 has a thin outer periphery and has a step on the outer periphery. Then, both ends of the crystal blank 1 are fixed and held on the stepped portions. Note that a conductive path 7 (not shown) is formed in the stepped portion and extends from the laminated surface of the ceramic to the outer surface. Then, the outer periphery of the cover 3 is seam-welded to the welding ring 6 to seal it. In the seam welding, a pair of rollers (not shown) are brought into contact with opposing outer peripheral ridgeline portions of the cover 3, respectively. Then, the rollers are rotated and energized to resistance weld the opposite sides of one set of paper in the same way as the first weld, and the opposite sides of the other paper.

(Prior art interlocking point) However, in the above configuration, when fixing both ends of the crystal piece 1 to the stepped portion, a conductive adhesive (not shown), which is an organic substance of polymeric resin, is used.

Then, when the conductive adhesive solidifies, it generates stress on the crystal piece. Also, after fixation.

Due to the difference in the coefficient of linear expansion with the container body 2, the stress fluctuates with temperature.In this example, since both ends are fixed, this effect is particularly large, but even if one end is held, the same effect will occur. be. Furthermore, these organic substances have the problem of deteriorating aging characteristics such as changing the 5 oscillation frequency due to the generation of gas over time.

(Objective of the Invention) An object of the present invention is to provide a crystal resonator for surface mounting with good aging characteristics.

(Solution Means) The present invention forms a stepped portion on the inner wall of the container body so that one side of both ends of the crystal piece comes into contact with the other side of the crystal piece, and the elastic body interposed between the cover and the other side of both ends of the crystal piece The solution is to mechanically hold the crystal piece and to derive extraction electrodes extending to the other surfaces of both ends of the crystal piece by bonding, which will be specifically explained in the following examples.

(Embodiment) FIG. 1 is a diagram of a crystal oscillator illustrating an embodiment of the present invention, 13M (a) is an IIFrW Ell, and FIG. 1 (b) is an exploded view of the main parts. Note that the same numbers are given to the same parts as in the previous conventional example diagram, and their 'RqI's are omitted.

The crystal resonator is constructed by mounting a crystal piece 1 inside a container body 2 in the same manner as described above, and joining a cover 3 to the upper surface of the side wall (welding ring 6) by seam welding. In this embodiment, - one surface of the outer periphery of both ends of the crystal piece 1 is brought into contact with the stepped portion. and,
A metallic elastic plate 8 is provided between the cover 3 and the other side of the crystal piece 1.
is used to hold and fix the crystal piece 1 during seam welding. The elastic plate 8 is processed into an engineering shape (flat), and its center part is joined to the cover 3 in advance, and each leg part 9 (abcd) is connected to the crystal piece 1.
Abuts on the four corners of the Further, the extraction electrodes 4 extending to the outer periphery of both ends on the other side of the crystal blank 1 are constructed by connecting thin metal wires 10 to conductive paths 7 (not shown) by bonding.

In this type of device, the crystal piece 1 is held and fixed on the stepped part of the container body 2 using an elastic plate 8, and the electrodes are led out by bonding, so that it is possible to remove organic matter from the inside of the container, and to change the oscillation frequency. Prevents deterioration of characteristics over time.

Further, although both ends of the crystal piece are fixed to the elastic body, both ends are free in terms of density, so generation of stress due to a difference in coefficient of linear expansion can be avoided.

(Other matters) In addition, in the above embodiments, the elastic plate 8 was explained as an integral engineering shape (flat), but the elastic plate 8 is not limited to this, and it is possible to use individual elastic bodies and there are various embodiments. . Further, it does not necessarily need to be joined to the cover 3. Although described as a crystal oscillator, for example, an IC chip or the like may be mounted on the lower part of the container body to constitute a crystal oscillator or the like.

(Effects of the Invention) The present invention has the following features: - A stepped portion is formed on the inner wall of the container body so that one surface on both ends of the crystal piece comes into contact with the elastic body interposed between the cover and the other surface on both ends of the crystal piece. In addition to mechanically holding the ink piece, the lead electrodes extending to the other side of both ends of the crystal piece were derived by bonding, so that water and vibration for surface mounting with good aging characteristics was achieved. Can provide a child.

[Brief explanation of drawings]

1 [Figure 1 is a diagram of an ink vibrator explaining one embodiment of the present invention, the figure (,) is a sectional view, and the figure (b) is an exploded view of the main part. FIG. 112 is a diagram illustrating the basic configuration of a conventional example, in which (a) is a cross-sectional view and FIG. 112 (b) is a diagram of a crystal piece. Figure 1 Figure 2

Claims (1)

[Claims] In a surface mount crystal resonator, a welding ring is provided on the upper surface of a side wall of a container body that accommodates a crystal piece, and a cover for sealing the container body and the welding ring are joined by seam welding. A stepped portion is formed so that one surface of both ends of the crystal piece is brought into contact with the crystal piece, and the crystal piece is mechanically held by an elastic body interposed between the cover and the other side of both ends of the crystal piece, and the crystal piece is mechanically held. 1. A crystal resonator for surface mounting, characterized in that extraction electrodes extending to the other surface of both ends of a crystal piece are derived by bonding.