JP2000252748A - Surface mounted type piezoelectric oscillator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a base structure of an inexpensive oscillator that a surface mounted type is attained without changing the conventional structure by arranging a base made of a stacked substrate in the direction where a conductive terminal of the substrate extends and connecting the conductive terminal to the electrode of the base. SOLUTION: On both the surfaces of an epoxy substrate 2 having the conductive terminal 1 arranged on one side, a piezoelectric vibrator 3 in sealed structure and oscillation circuit components 4 are mounted to constitute an oscillation circuit. This oscillator has the base 5 made of the laminate epoxy substrate with a flank electrode 7 of the same kind as the epoxy substrate 2 in the extending direction of the conductive terminal 1 (right above the components). A through hole (for connection with the component-mounted substrate) which is connected to the conductive terminal 1 by soldering is formed and a spot facing hole is bored in the base 5 up to its intermediate layer to absorb projection parts of the solder part of the conductive terminal 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container structure for easily converting a conventional lead terminal type product into a surface mount type lead structure by improving the shape of the container of a piezoelectric oscillator.

[0002]

2. Description of the Related Art In a conventional piezoelectric oscillator, a printed pattern for mounting a piezoelectric vibrator or an electronic component having a closed structure is arranged on a laminated substrate, and the piezoelectric vibrator or the electronic component is mounted on the same plane of the laminated substrate. To form an oscillator. The piezoelectric oscillator multiplies the center frequency of the crystal unit by a multiplying circuit, amplifies the output voltage of the crystal unit, outputs a waveform, or outputs an oscillation frequency twice or more the oscillation frequency.

[0003]

As a recent trend, miniaturization has been rapidly developed mainly in the field of mobile communication such as wireless communication equipment and portable telephones, and in the field of industrial equipment. Oscillators incorporated in these fields are also required to be miniaturized, and the oscillation frequency of the oscillator tends to shift to a higher frequency band, and the circuit board mounting form of the oscillator is changed from a lead type to a surface mount type. It is the present situation that is changing.

FIG. 3 shows a side view of a conventional oscillator. In the related art, a shape in which a piezoelectric vibrator or an electronic component is mounted on one surface of a component mounting board and mounted on another circuit board by a lead terminal is shown (FIG. 3A). But,
The demand for the form of the lead terminal has changed from the lead terminal to the surface mount type, and the surface mount type as shown in FIG. 3B has become the mainstream in recent years.

On the other hand, as described above, with the downsizing of the oscillator itself and the shift of the oscillation frequency of the oscillator to a high frequency band,
In the circuit configuration of a piezoelectric oscillator, the number of electronic component circuits constituting the oscillator is increased, such as by increasing the number of multiplier circuits. Oscillator consisting of a piezoelectric vibrator and electronic components mounted on one side is mounted.Piezoelectric vibrators and electronic components are mounted on both sides of the component mounting board, increasing the number of electronic components constituting the oscillator and shifting the oscillation frequency to the high frequency band. However, oscillators have been downsized.

However, in this case, as shown in the side view of FIG. 3 (c), it is necessary to mount components (oscillators and electronic components) constituting the oscillator on both sides of the substrate to realize a surface mount type. The lead shape of the mounting board becomes the lead shape as shown in FIG. 3C, and the length of the terminal becomes longer. As a result, the terminal strength, the shape of the terminal may be deformed, the parallelism of the terminal may be deteriorated, or the surface mounting may be performed. However, there is a problem in that the production of an oscillation circuit board having a different lead shape for use in the device causes a cost.

[0007]

SUMMARY OF THE INVENTION In order to solve these problems, the present invention provides an epoxy board having a conductive terminal disposed on one side, a piezoelectric vibrator and an oscillator circuit component having a hermetically sealed structure mounted on both sides of the epoxy board. On the surface side, a laminated epoxy board is arranged, a through hole is formed at the position of the conductive terminal, and further, a stupid hole is made from the surface of the laminated epoxy board to the middle layer of the laminated epoxy board, and the land pattern of the middle layer is exposed, and the laminated epoxy board is exposed. A surface-mounted piezoelectric oscillator characterized in that a soldering of the conductive terminal and a conductive terminal to form a connection terminal absorbs a convex part of the solder to form a surface-mounted form.

[0008]

Background of the Invention The present invention responds to the demand for downsizing the oscillating frequency of an oscillator that has a high frequency band and the size of a piezoelectric oscillator, by mounting piezoelectric vibrators and electronic components on both sides of an epoxy substrate that constitutes the oscillator, and providing a high-density circuit. The present invention is characterized by a surface-mount type piezoelectric oscillator that realizes miniaturization with a configuration. For this purpose, as shown in the side view of FIG. 3 (c), a piezoelectric vibrator and an oscillation circuit component having a hermetically sealed structure are mounted on both sides of an epoxy substrate having lead terminals arranged on one side, and an L-shaped terminal portion (others) is provided. By placing an epoxy board with a conductive part with the circuit board of
Although surface mounting can be realized, since the long conductive terminals are soldered (joined) to the above-mentioned epoxy substrate, an unstable state such as deformation of terminal shapes and deterioration of plane parallelism between terminals is caused.

In order to improve this unstable state, the present invention mounts a piezoelectric vibrator and an oscillation circuit component having a sealed structure on both sides of an epoxy substrate having conducting terminals on one side, and a side electrode portion on the conducting terminal side. Place a laminated epoxy board with a conductive part with other circuit boards, make a counterbore hole from the side opposite to the component mounting board to the middle layer at the position of the conductive terminal, and make solder bumps (solder pile during soldering) It is an object of the present invention to provide a surface-mounted piezoelectric oscillator that absorbs light. According to the present invention, the price of the oscillator itself can be reduced by performing surface mounting on an inexpensive epoxy substrate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention has a piezoelectric vibrator and an oscillating circuit component having a hermetically sealed structure mounted on both sides of a component mounting substrate on which conductive terminals are arranged on one side, and a laminated circuit board is mounted on the conductive terminal surface of the substrate. A surface mounting type piezoelectric element characterized in that the connection terminals are arranged and arranged in a surface mounting form, and a counterbore is formed at the connection terminal position of the above-mentioned laminated circuit board to an intermediate layer. It is an oscillator.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In each drawing, the same reference numeral indicates the same object. FIG. 1 shows a perspective view of a piezoelectric oscillator according to the present invention. An oscillator circuit is configured by mounting a piezoelectric vibrator 3 and an oscillation circuit component 4 having a sealed structure on both sides of an epoxy substrate 2 on which a conduction terminal 1 is arranged on one side. Although a detailed pattern of the epoxy board 2 is not described, a power supply for operating as an oscillator and a conductive terminal 1 for obtaining an oscillation frequency output are soldered to the epoxy board 2.

That is, a partial sectional view of FIG. 2 (arrow A in FIG. 1)
As shown in FIG. 2B, a laminate having a side electrode 7 of the same type as the epoxy substrate 2 is provided in the direction in which the conductive terminal 1 of the epoxy substrate 2 on which the piezoelectric vibrator 3 and the oscillation circuit component 4 are mounted extends (just below the component). A base 5 made of an epoxy substrate is arranged,
Through hole 9 connected to conductive terminal 1 by soldering
(As a connection with the component mounting circuit board), and the counterbore hole 6 is drilled in the base 5 up to the intermediate layer 10 to absorb the above-mentioned protrusion of the solder portion of the conductive terminal 1 and to be surface-mounted by an epoxy board. Is realized.

In the cross-sectional view of FIG. 2, the end of the conductive terminal 1 is fixed to the base 5 by soldering to establish conduction.
On the side of the base 5 corresponding to the solder portion, a side surface electrode 7 (a land pattern is formed by a through hole) extending to the side surface of the base 5 extends, and forms an electrode for external connection. On the other hand, the convex portion of the soldering portion with the conductive terminal 1 has a counterbore hole 6 extending to the intermediate layer 10 at a position corresponding to the soldering portion position of the base 5 made of a laminated epoxy board.
Is formed, the convex portion of the solder can be absorbed into the inside of the base 5 from the surface thereof, and an external connection electrode having a good degree of plane parallelism at the connection portion with the external substrate can be obtained. Here, the interval between the component mounting board 2 and the base 5 is determined by a stopper provided on the conductive terminal 1 (not shown), a jig used during the manufacturing process, and the like.

The oscillator of this embodiment is a piezoelectric oscillator (V
CXO, TCXO, CXO) are assumed, but the present invention is not limited to the piezoelectric oscillator, and can be applied to surface mounting of the terminal shape of an LC oscillator, a SAW oscillator, or another electronic component. Further, a quartz oscillator or a ceramic material is used as the piezoelectric material.

[0015]

As described above, in order to realize the surface mounting according to the present invention, it is possible to form the surface mounting type using an inexpensive epoxy substrate without using a special surface mounting terminal, or to use a conventional oscillator. Since the circuit board can be used, the design man-hours of the surface mount type oscillator can be greatly reduced. A surface-mount type piezoelectric oscillator can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a piezoelectric oscillator according to the present invention.

FIG. 2 is a side view of a main part piezoelectric oscillator of the present invention.

FIG. 3 is a side view of a conventional piezoelectric oscillator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conduction terminal 2 Component mounting board 3 Piezoelectric vibrator 4 Oscillation circuit component 5 Base 6 Counterbore hole 7 Side electrode

Claims (3)

[Claims] A piezoelectric vibrator and an oscillation circuit component having a hermetically sealed structure are mounted on both sides of a component mounting board on which conductive terminals are arranged on one side, and a base made of a laminated substrate is mounted on the board in a direction in which the conductive terminals extend. A surface-mounted piezoelectric oscillator, wherein the piezoelectric element is disposed and the conductive terminal is connected to the electrode of the base. 2. A surface mount type piezoelectric oscillator according to claim 1, wherein a counterbored hole is formed at the connection terminal position of the base and connected to an electrode extending to a side surface of the base. 3. The piezoelectric oscillator according to claim 1, further comprising a base of a laminated substrate having a through hole, wherein the through hole is subjected to a counterbored hole toward an intermediate layer of the laminated substrate, and the counterbored hole processed surface is formed. A surface-mounted piezoelectric oscillator using a substrate having an exposed land pattern of the intermediate layer as viewed from above.