JPH08102638A - Surface mounted crystal oscillator - Google Patents

Abstract

PURPOSE: To prevent a crystal resonator from being detached from a fixing tool due to shock or the like and to excellently maintain oscillation characteristics. CONSTITUTION: In a surface mounted crystal oscillator consisting of a crystal oscillator formed by sealing a crystal chip into a metallic container consisting of a base and a cover and a resonator fixing tool 6 with L-shaped terminal parts 8 extended toward both the end sides of a fixing tool body for enclosing the metallic container, a through hole 13 to be joined with the base by the inflow of solder at the time of loading is formed on the flat part of the L-shaped terminal part 8 on the other end side of the fixing tool body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field of use of a surface mount crystal oscillator (referred to as a surface mount oscillator) using a vibrator fixture (referred to as a fixture). The present invention relates to a surface mount oscillator that prevents detachment of the oscillator.

[0002]

BACKGROUND OF THE INVENTION This type of surface mount oscillator uses, for example, a conventional crystal oscillator sealed by resistance welding.
It can be easily manufactured, has high reliability by preventing airtight leakage, etc.
It is useful for various electronic devices.

[0003]

2. Description of the Related Art FIGS. 4 to 6 are views for explaining a conventional example of a surface mount oscillator. Note that FIG. 4 is a crystal oscillator, FIG. 5 is a schematic external view of the fixture, and FIG. 6 is a front view of the surface mount oscillator. The crystal unit 1 is formed by hermetically sealing a crystal piece (not shown) in a metal container 4 in which a base 2 and a cover 3 are resistance-welded, and leading a pair of lead wires 5 as airtight terminals from the base 2. The fixture 6 includes a fixture body 7 that encloses the side surface and the upper surface of the metal container 4, and an L-shaped terminal portion 8 extending from both ends of the bottom portion of the fixture body 7.

In such a structure, the crystal unit 1 is held and fixed to the fixture 6. Then, the terminal portion 8 of the fixture 6 and the lead wire 5 of the crystal resonator 1 are fixed to a conductive path (not shown) of the circuit board 9 by melting the cream solder 10 or the like and surface-mounted.

[0005]

However, in the structure described above, the crystal unit 1 is detached from the other end side of the fixture 6 after being mounted on the circuit board 9 due to a shock, for example, due to a shock. Then, as shown in FIG. 7, there is a problem that the lead wire 5 is deformed by being loaded, the glass (not shown) in the airtight portion is damaged, and the vibration characteristic due to airtight leakage is impaired. In the crystal unit 1, since the flange portion 11 serving as a joint portion between the base 2 and the cover 3 projects from the bottom surface A of the fixture main body 7, basically, the internal direction of the fixture main body 7 (left in the figure) It does not move in the direction) but moves in the outside direction (to the right in the figure). For this purpose, for example,
As shown in Japanese Patent No. 423, etc., there is one in which a stopper (not shown) is provided on the flat portion of the L-shaped terminal portion 5. However, in such a device, a great external force is required when inserting and fitting the crystal unit in the fixture, and there is a problem in workability and the like.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a surface mount oscillator which prevents a crystal oscillator from being detached from a fixture due to impact or the like and maintains good vibration characteristics.

[0007]

The present invention relates to an L on the other end side of a fixture body.
A basic solution is to provide a flat portion of the character-shaped terminal portion with a through hole through which solder at the time of mounting flows and is joined to the base of the metal container. An embodiment of the present invention will be described below.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view of a surface mount oscillator, particularly a fixture, for explaining an embodiment of the present invention. Incidentally, the same numbers are given to the same parts in the previous conventional example, and the description thereof will be omitted.
The crystal unit 1 is formed by hermetically sealing a crystal piece in a metal container 4 and leading out a pair of lead wires 5 from the base 2 as described above (see FIG. 4 above). The fixture 6 extends the L-shaped terminal portion 8 from both ends of the fixture body 7 that wraps the metal container 4. The height d of the L-shaped terminal portion 8 is set to a length close to the protruding length of the flange portion 11 of the metal container 4. In this embodiment, the through hole 12 is provided in the flat portion 11 of the L-shaped terminal portion 5 on the other end side of the fixture body 7.

In such a structure, as shown in FIG. 2, when the surface mount vibrator is mounted on the circuit board 9 by melting the cream solder 10, the melted cream solder 10 is applied to the L-shaped terminal portion 8. It flows in and protrudes from the provided through-hole 13 (referred to as a solder protrusion 14). However, the solder protrusions 14 are arranged in advance so as to reach the bottom surface of the base 2.
Position and amount of solder are controlled. Therefore, after the surface mount oscillator is mounted on the circuit board 9, the solder protrusions 14 function as stoppers to prevent the solder protrusions 14 from being detached from the fixture 6. That is, the flange portion 11 of the metal container 4 is L
Since it is sandwiched between the vertical portion 15 of the character-shaped terminal portion 8 and the solder protrusion portion 14, basically, the movement of the fixture main body 7 inward and outward is prevented. Due to this, it is possible to prevent the crystal oscillator 1 from being separated due to displacement during impact, and to maintain good vibration characteristics without damaging the glass of the lead wire 5 (airtight terminal). And simply L
Since it is sufficient to form the through hole in the flat portion 12 of the character-shaped terminal portion 8, the workability thereof is also improved.

Although the through-hole has a single circular shape in the above-described embodiment (FIG.), It may have a plurality of holes or may have an elongated slit shape, for example, and the shape is not limited. In addition, a protrusion piece (not shown) may be provided on one end side of the fixture main body 7 (the head side of the crystal unit) to be held and fixed firmly, as a precaution. Moreover, as shown in FIG.
It may be set to 0 or to easily flow in.

[0011]

According to the present invention, the flat portion of the L-shaped terminal portion on the other end side of the fixture body is provided with the through hole through which the solder at the time of mounting flows and is joined to the base. It is possible to provide a surface mount oscillator that prevents the crystal oscillator from being detached from the fixture and maintains good vibration characteristics.

[Brief description of drawings]

FIG. 1 is a partial view of a fixing tool for explaining an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a surface mount oscillator according to an embodiment of the present invention when mounted.

FIG. 3 is a partial cross-sectional view of a surface mount oscillator when another embodiment of the present invention is mounted.

FIG. 4 is a diagram of a crystal resonator for explaining a conventional example.

FIG. 5 is an external view of a fixture for explaining a conventional example, and FIG. 6 is a front view of a surface mount oscillator.

FIG. 6 is a front view of a surface mount oscillator for explaining a conventional example.

FIG. 7 is a front view of a surface mount oscillator for explaining the problems of the conventional example.

[Explanation of symbols]

1 crystal oscillator, 2 base, 3 cover, 4 metal container, 5 lead wire, 6 fixture, 7 fixture body, 8
L-shaped terminal portion, 9 circuit board, 10 solder, 11 flange portion, 12 flat portion, 13 through hole, 14 protrusion portion.

Claims (1)

[Claims] 1. A crystal resonator formed by enclosing a crystal piece in a metal container composed of a base and a cover, and a vibration in which L-shaped terminal portions extend to both ends of a fixture body that wraps the metal container. In a surface-mounting crystal unit including a fixture for a child, a through hole through which solder at the time of mounting flows and joins to the base is provided in a flat portion of the L-shaped terminal portion on the other end side of the fixture body. A crystal resonator for surface mounting, which is characterized by being provided.