JP2003163557A - Manufacturing method of surface-mounted piezoelectric vibrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid exposing a surface of a cylindrical sealing pipe of a lead type cylindrical piezoelectric vibrator from a top and bottom surfaces, and poor printing and a defect by a short upon mounting in a surface-mounted piezoelectric vibrator, in which a portion of a lead frame becomes an electrode of the surface-mounted piezoelectric vibrator and a bottom surface of the electrode is not covered with resins, and to provide a thin, downsized, and inexpensive surface-mounted type piezoelectric vibrator. <P>SOLUTION: In a manufacturing method of the surface-mounted piezoelectric vibrator, a lead of a lead type cylindrical piezoelectric vibrator 1 having two leads at one end is fixed to a lead frame, the lead frame is insertion-molded by a resin 8, a portion of the frame becomes an electrode of the vibrator by cutting and forming, and the bottom surface of the electrode is not covered with the resin 8. An insertion-mold has no push pin of the lead type cylindrical piezoelectric vibrator 1, an upper mold 21 shifts to an upper direction during insertion-molding of a resin, a lower mold 22 shifts to a lower direction, and the lead type cylindrical piezoelectric vibrator 1 is resin-molded. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a surface mount type piezoelectric vibrator. 2. Description of the Related Art The surface mounting of electronic components has been advanced, and the number of piezoelectric vibrators, which are one of the electronic components, which are compatible with surface mounting is increasing. The surface mount type structure of the piezoelectric vibrator has a structure in which the piezoelectric element is directly incorporated in a case corresponding to the surface mounting, and a structure in which the lead type cylindrical piezoelectric vibrator is fixed to the lead frame, insert molded with resin, and cut and formed. It is roughly divided into. The present invention relates to the latter structure. FIG. 1 is a front view of a typical surface-mount type piezoelectric vibrator according to the prior art, and FIG. 2 is a top view, in which a lead type cylindrical piezoelectric vibrator insert-molded inside a resin and a lead frame are indicated by dotted lines. Displayed with. FIG. 6 is an exploded perspective view of a lead type cylindrical piezoelectric vibrator. The lead type cylindrical piezoelectric vibrator is a general vibrator in which a vibrating piece is fixed to an airtight terminal having two leads and sealed with a cylindrical sealing tube. The surface mount type piezoelectric vibrator fixes the leads 2 and 3 of the lead type cylindrical piezoelectric vibrator 1 to terminal portions 4 and 5 serving as electrodes of the surface mount type piezoelectric vibrator of the lead frame by resistance welding or laser welding or the like. Process, a process of insert molding with the resin 8 while leaving the electrodes 4, 5 and the terminals 6, 7, a process of separating the electrodes 4, 5 and the terminals 6, 7 from the lead frame, and bending the electrodes 4, 5, and the terminals 6, 7 And
It is manufactured by a process in which the electrodes 4 and 5 and the terminals 6 and 7 are arranged below the resin 8. The model number, manufacturing date, etc. are printed on the upper surface of the surface mount type piezoelectric vibrator. [0004] Mobile products such as mobile phones are strongly required to be small, thin, and inexpensive.
Various structures have been devised for the surface mount type piezoelectric vibrator in order to achieve a reduction in size, thickness and weight of 1 g. FIG. 3 is a front view of the surface mount type piezoelectric vibrator according to the present invention, and FIG. 4 is a bottom view, in which the lead type cylindrical piezoelectric vibrator insert-molded inside the resin is indicated by a dotted line. The terminal portions 14 and 15 and the terminal portion 16 of the lead frame serving as electrodes of the surface-mount type piezoelectric vibrator 10 are arranged on the lower surface of the resin 17. The structure is fixed. The leads 12 and 13 of the lead type cylindrical piezoelectric vibrator 11 are electrodes 14,
It is formed as shown in the figure for connection and fixing to the connector 15.
Compared to the structure of FIG. 1, the electrodes 5, (4) and the terminal 7
The thickness of (6) is reduced in thickness. In addition, it is possible to reduce the cost by eliminating the bending process of electrodes and terminals after insert molding. The above-described surface-mount type piezoelectric vibrator, which can be made thinner and inexpensive, requires the vertical direction of the surface-mount type piezoelectric vibrator to be made thinner. The thickness of the resin can be reduced by reducing the thickness of the resin. However, in the method of holding down the lead-type cylindrical piezoelectric vibrator by the holding pin installed in the insert molding die, when the gap between the molding die and the lead-type cylindrical piezoelectric vibrator becomes narrow, the resin around the holding pin goes around. become worse. As a result, the surface of the cylindrical sealing tube of the lead type cylindrical piezoelectric vibrator which is insert-molded inside the resin is exposed on the upper and lower surfaces of the surface mount type piezoelectric vibrator, and printing is poor on the upper surface,
On the lower surface, there is a problem that a short circuit failure occurs when the circuit board is mounted on the circuit board. An object of the present invention is to provide a surface mount type piezoelectric vibrator in which the thickness dimension is close to the diameter of the cylindrical sealing tube of the lead type cylindrical piezoelectric vibrator, Provided is a thin, small, and inexpensive surface mount type piezoelectric vibrator that does not expose the surface of the cylindrical sealing tube of the lead type cylindrical piezoelectric vibrator from the upper surface and the lower surface, eliminates printing defects and short circuit defects at the time of mounting. It is in. A lead-type cylindrical piezoelectric vibrator having two leads at one end is fixed to a lead frame, and the lead frame is insert-molded with resin and cut and formed. In a method of manufacturing a surface-mount type piezoelectric vibrator, wherein a part of the lead frame is an electrode of the surface-mount type piezoelectric vibrator, and a lower surface of the electrode is not covered with resin, insert molding is performed. The die does not have a pin for the lead type cylindrical piezoelectric vibrator, and the upper die moves upward and the lower die moves downward during insert molding of the resin. A method for manufacturing a surface-mount type piezoelectric vibrator in which the element is resin-molded. FIG. 5 is a cross-sectional view of a surface mount type piezoelectric vibrator according to an embodiment of the present invention at the time of insert molding, and shows a molding upper mold 21 and an upper mold movable section. 21a, upper mold movable portion spring 25, lower mold 22 and lower mold movable portion 22a,
The lower mold movable portion spring 26 and the lead type cylindrical piezoelectric vibrator 1 that is insert-molded inside the resin are shown. At the start of molding, the lead-type cylindrical piezoelectric vibrator 1 is held down by the upper mold movable portion 21a and the lower mold movable portion 22a, and the resin 8 is filled into the mold by applying pressure. The resin 8 enters the gap between the lead-type cylindrical piezoelectric vibrator 1 and the upper mold 21 and the lower mold 22 and solidifies to form the lead-type cylindrical piezoelectric vibrator 1.
Can be positioned. After that, when the filling pressure of the resin 8 is increased, the spring 25 for the upper mold movable section and the spring 26 for the lower mold movable section contract, and the upper mold movable section 21a and the lower mold movable section 22a are moved and set. After moving by the resin thickness, the filling of the resin 8 is completed, and the insert molding is completed with the target resin thickness.
In the description of the present embodiment, the movement of the upper mold movable section 21a and the lower mold movable section 22a has been described by a spring, but may be moved by mechanical driving. According to the present invention, the surface of the lead-type cylindrical piezoelectric vibrator is not exposed to the upper and lower surfaces of the surface-mount type piezoelectric vibrator, and the surface is free from printing defects and short-circuit defects with the substrate. A mounted piezoelectric vibrator is obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a typical surface-mount type piezoelectric vibrator according to the prior art. FIG. 2 is a top view of a typical surface-mount type piezoelectric vibrator according to the prior art. FIG. 4 is a front view of the surface-mount type piezoelectric vibrator according to the present invention. FIG. 4 is a bottom view of the surface-mount type piezoelectric vibrator according to the present invention. FIG. 5 is insert molding of the surface-mount type piezoelectric vibrator according to one embodiment of the present invention. Front sectional view of mold [Fig. 6] Exploded perspective view of lead type cylindrical piezoelectric vibrator [Description of symbols] 1 Lead type cylindrical piezoelectric vibrator 2 Lead 3 Lead 4 Electrode 5 Electrode 6 Terminal 7 Terminal 8 Resin 10 Surface Mounting type piezoelectric vibrator 11 Lead type cylindrical piezoelectric vibrator 14 Electrode 15 Electrode 16 Terminal part 17 Resin 21 Upper mold 21a for molding Upper movable mold for molding 22 Lower mold for molding 22a Lower movable mold for molding 25 Upper mold movable part spring 26 Lower metal Mold movable part spring

Claims (1)

Claims: 1. A lead-type cylindrical piezoelectric vibrator having two leads at one end is fixed to a lead frame,
A surface mount type piezoelectric vibrator in which the lead frame is insert-molded with a resin and cut and formed, wherein a part of the lead frame becomes an electrode of the surface mount type piezoelectric vibrator, and a lower surface of the electrode is covered with a resin. In the method of manufacturing a surface mount type piezoelectric vibrator, the insert molding die does not have the holding pin of the lead type cylindrical piezoelectric vibrator, and the upper die of the molding die moves upward and downward during insert molding of resin. A method for manufacturing a surface mount type piezoelectric vibrator, wherein a die moves downward and a lead type cylindrical piezoelectric vibrator is resin-molded.