JPH079454Y2 - Surface mount type piezoelectric vibrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) As electronic devices rapidly increase in density and size, surface mount devices for mounting electronic components only on the surface of a printed wiring board are required. The present invention relates to a surface-mounted piezoelectric vibrator that meets such requirements.

(Prior Art) Several types of piezoelectric vibrators compatible with surface mounting have been conventionally devised. For example, a chip type package in which a ceramic or resin package is used and a piezoelectric vibration element is installed therein may be used. Further, as shown in FIG. 4, a piezoelectric vibrator with a lead terminal 1 in which a conventional metal base and a metal can are hermetically sealed by cold pressure welding (cold weld), resistance welding (resistance weld) or the like having high airtightness. There is also a configuration in which an L-shaped support plate 3 is attached to the tip of the upper portion and three-point support is performed in combination with two lead terminals.

(Problems to be Solved by the Invention) Among the above-mentioned conventional techniques, the former has a problem that reliability is not sufficient for airtightness and heat resistance is relatively low because sealing is performed with solder or resin material. there were. The latter has the same airtightness and heat resistance as the conventional piezoelectric vibrator with lead terminals, but the workability when attaching the L-shaped support plate to the piezoelectric vibrator or mounting it on the printed wiring board is not good. There was a problem.

The present invention was made to solve the above problems,
It is an object of the present invention to provide a surface mount type piezoelectric vibrator which is excellent in airtightness and heat resistance and which can be easily adapted to surface mounting.

(Means for Solving the Problem) The surface-mounted piezoelectric vibrator according to the present invention is a piezoelectric vibrator in which a piezoelectric vibrating element installed on a base is hermetically sealed with a cap and lead terminals are led out from the base. See
Consists of a convex portion on which the piezoelectric vibrator is mounted, a holding claw following the convex portion that extends upward and has its tip tilted inward when the piezoelectric vibrator is mounted, and a stopper provided on either one of the convex portions. It is characterized by being mounted on a holder.

(Operation) To attach the piezoelectric vibrator to the holder, a method of inserting the piezoelectric vibrator from the longitudinal direction Z of the piezoelectric vibrator as shown in the perspective view of FIG. 1A and a sectional view of FIG. There is a method in which both ends in the width direction of the piezoelectric vibrator are alternately inserted from the thickness direction X while the holding claws of the holder are slightly widened as shown in FIG.
Accordingly, the piezoelectric vibrator can be held by the upper portion of the convex portion and the holding claw, and a normal piezoelectric vibrator can be extremely easily adapted to surface mounting.

(Embodiment) An embodiment according to the present invention will be described with reference to FIGS. 1 (a), (b) and (c).

An embodiment according to the present invention will be described by taking a crystal oscillator as an example of a piezoelectric oscillator. As shown in the perspective view of FIG.
The crystal unit 1 includes a base made by penetrating lead terminals 11 and 12 through a metal shell through glass, an AT-cut crystal plate having electrodes formed on the surface of the base, and the crystal plate. It is composed of a metal cap 16 which is hermetically sealed by coating (the internal structure of the crystal unit is not shown). As shown in the side view of FIG. 1 (c), the lead terminals 11 and 12 are in contact with the printed wiring board when the piezoelectric vibrator 1 is mounted on the holder 2 and the lead terminals 11 and 12 are laid down sideways. It is bent twice about 90 degrees in different directions.

The holder 2 is made of a metal plate such as nickel-white and has a convex portion 21 on which the piezoelectric vibrator is mounted in a convex shape when viewed in cross section, concave portions 22 and 23 on both sides of the convex portion, and rising upwards from the concave portion. It comprises holding claws 24 to 27 whose tip portions are bent inward, and a stopper 28 formed at one end of the convex portion in the longitudinal direction.
The tip of this holding claw is chamfered to prevent unnecessary damage to the piezoelectric vibrator. In order to secure the holding force of the holder to the piezoelectric vibrator, the holding claws 24, 2
The distance between 5 and 26, 27 should be selected to be slightly smaller than the width of the piezoelectric vibrator 1. Further, in order to securely hold the piezoelectric vibrator, it is desirable that the number of the holding claws is four or more.

The surface mount type piezoelectric vibrator is completed by mounting the piezoelectric vibrator 1 on the holder 2 from the X direction or the Z direction. In particular, the presence of the convex portion and the concave portion of the holder causes the first
When the space A is created as shown in FIG. 6B and the piezoelectric vibrator is mounted from the X direction, it is easy to alternately insert the piezoelectric vibrators in the width direction (arrow B) and the flexibility of the holder in the width direction. Can be improved (arrow C).

Other Embodiments, etc. The present invention is not limited to the above embodiments, and the holder may have a cross-sectional shape as shown in FIGS. 2 and 3. Further, the height of the convex portion may be determined depending on the material used for the holder (in consideration of elastic constant and the like) and the like.

(Effect) According to the surface mount type piezoelectric vibrator of the present invention, the piezoelectric vibrator with lead terminals is mounted on the holder having the convex portion for mounting the piezoelectric vibrator and the holding claw. Is easily attached to the holder, and the holding force does not loosen. In addition, since the bottom of the completed surface-mounted piezoelectric vibrator is flat or has a structure having a plurality of lines (the lowest part of the circumference) as shown in FIG. 3, it is self-supporting and can be mounted on a printed circuit board or the like. Easy to install. Moreover, since the piezoelectric vibrator can use a structure in which a metal base and a metal can are hermetically sealed by cold pressure welding (cold weld), resistance welding (resistance weld), etc. with high airtightness, reliability in terms of quality It is possible to provide a surface-mounted piezoelectric vibrator having a sufficiently high property.

[Brief description of drawings]

1 (a), 1 (b) and 1 (c) are views showing an embodiment of the present invention, FIG. 2 and FIG. 3 are views showing other embodiments, and FIG. It is a figure which shows a prior art example. 1 ... Piezoelectric vibrator 2 ... Holder

Claims (1)

[Scope of utility model registration request] 1. A piezoelectric vibrating element installed on a base is hermetically sealed with a cap, and a piezoelectric vibrator having lead terminals led out from the base is viewed in cross section, and a convex portion on which the piezoelectric vibrator is mounted and the convex portion After mounting the concave part on the surface, the piezoelectric element is mounted on the holder, which has a holding claw for fixing the piezoelectric vibrator whose tip extends inwardly and extends upward, and a stopper provided on one of the convex parts. Shaped piezoelectric vibrator.