JPH10308642A - Container for surface mounted crystal oscillator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce man-hour and cost not only at the time of mounting but also in packing at assembly, inspection and shipping and to prevent defect occurrence caused by a directional error at the time of mounting by respectively commonly connecting the mounting electrode positioned diagonally. SOLUTION: For example, an outside base 11 of the ceramic container is a mounting face for mounting on a printed circuit board and made square, and corresponding to the respective corner parts, four square mounting electrodes 12a-12d are formed. Then, the diagonals of the mounting face, namely, the mounting electrodes 12a and 12c positioned at both the terminal parts of diagonal lines on the mounting face, are connected in common and besides, the mounting electrodes 12b and 12d are connected in common. Then, a crystal oscillator 13 is housed in the container. In this case, the container is sealed by a lid body and the main body of components are protected or the air-tightly sealed container is kept in the atmosphere of vacuum or inactive gas. Thus, proper electric connection is enabled in the case of mounting on the printed circuit board in spite of vertical or horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type crystal resonator container which can be mounted without considering the directionality.

[0002]

2. Description of the Related Art In recent years, there has been a tendency to use surface-mounted components in various electronic devices for miniaturization, weight reduction and automation of an assembling process. For this reason, surface mount type components also tend to be used in composite components and circuit modules having three or more mounting electrodes.

However, in the case of an electronic component having three or more mounting electrodes, the directionality of the component is determined in each of the steps such as pattern layout at the time of design, component mounting in an assembly process, inspection process, and taping for shipping. It needs to be considered. Further, at the time of shipment, the packaging electrodes must be packed so that the mounting electrodes are aligned in the same direction.

For this reason, in addition to the original product assembly work,
The cost also rises due to the additional work of aligning and arranging the mounting electrodes of the product, and even if it is a good product that does not have any electrical and mechanical problems, only the mounting electrode direction is different There was also a problem that it became a defective product.

FIG. 3 is a bottom view showing an example of an arrangement of mounting electrodes on a mounting surface of a conventional surface mount type crystal unit. For example, four mounting electrodes 2a, 2b, 2c, 2d are formed on the bottom surface 1 of a small ceramic container. The mounting electrodes 2a to 2d may be formed by, for example, bending a thin metal plate or forming a thin metal film by metallizing.

A quartz oscillator 3 is housed inside the small container, and its terminals are connected to, for example, the mounting electrodes 2b,
2c. Therefore, in such a case, when mounting on a printed circuit board on which a conductive pattern is formed corresponding to the mounting electrodes 2a to 2d, directivity is generated, and connection to the electrode is performed in a direction different from the design intention for inspection, or When mounted on a printed circuit board, no electrical connection is made.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and provides a surface-mount type crystal resonator container capable of making an appropriate electrical connection regardless of the direction of components. It is intended to provide.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a surface-mount type crystal unit in which four mounting electrodes are arranged corresponding to each corner of a rectangular mounting surface. The electrode is connected in common.

[0009]

Embodiments of the present invention will be described below with reference to plan views of mounting surfaces shown in the drawings. 11 in the figure
Is the outer bottom surface of, for example, a ceramic container. This bottom surface is a mounting surface to be mounted on a printed circuit board (not shown), and has four square mounting electrodes 12a, 12b, 12c, and 12d corresponding to each corner.

[0010] The mounting electrodes 12a and 12c located at both ends of a diagonal line of the mounting surface, that is, diagonal lines of the mounting surface are commonly connected, and the mounting electrodes 12b and 12d are commonly connected. Reference numeral 13 denotes a crystal oscillator housed in a container. The container is sealed with a lid (not shown) to protect the component body, or airtightly sealed to maintain the inside of the container in a vacuum and an atmosphere of an inert gas.

In designing the conductive pattern of the printed circuit board on which the electronic component of the above embodiment is mounted, the circuit to be connected to the two terminals of the component body is replaced by the surface mount type electronic component of the above embodiment. It is necessary to connect each of the four terminals arranged on the component mounting surface to adjacent terminals.

With such a configuration, proper electrical connection can be made in any of up, down, left, and right directions when mounting on a printed circuit board. Also, it is not necessary to consider the direction of the parts during the assembling process, the inspection process, and the packing at the time of shipping. Accordingly, it is not necessary to perform an additional operation of aligning and aligning the mounting electrodes, and the cost can be reduced by reducing the number of steps.

The present invention is not limited to the above-described embodiment of the present invention, but can be applied to, for example, an electronic component having a rectangular mounting surface as shown in FIG. However, when the mounting surface is rectangular as described above, the configuration has no directivity only in one of the upper and lower directions or the left and right directions.

[0014]

The present invention is embodied in the form described above and has the following effects.

In the case of a square mounting surface, an appropriate electrical connection can be made in any of the up, down, left, and right directions. In the case of a rectangular mounting surface, regardless of the up, down, left, or right direction, regardless of the direction. Appropriate electrical connection can be made. Therefore, man-hours can be significantly reduced not only at the time of mounting but also at the time of assembly, inspection, packing at the time of shipping, etc.
There is an advantage that the cost can be reduced and a defect due to an erroneous mounting direction does not occur.

[Brief description of the drawings]

FIG. 1 is a plan view showing a mounting surface of a container of a surface-mount type crystal unit of the present invention.

FIG. 2 is a plan view showing a mounting surface of a container of a surface mount type crystal unit according to another embodiment of the present invention.

FIG. 3 is a plan view showing an example of a mounting surface of a container of a conventional surface mount type crystal unit.

[Explanation of symbols]

 11 outer bottom surface (container) 12a, 12b, 12c, 12d mounting electrode 13 component body

Claims (2)

[Claims] 1. Four mounting electrodes are arranged corresponding to each corner of a rectangular mounting surface, and a quartz oscillator is housed therein, and mounting electrodes located diagonally are connected in common. A container for a surface-mount type crystal unit, characterized in that: 2. The surface mount type crystal resonator container according to claim 1, wherein four mounting electrodes are arranged symmetrically with respect to the center of the square mounting surface.