JP4294357B2 - Manufacturing method of surface mount type piezoelectric vibrator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a surface mount piezoelectric vibrator.
[0002]
[Prior art]
With the progress of surface mounting of electronic components, the number of piezoelectric vibrators, which are one of electronic components, corresponding to surface mounting is increasing. The surface mounting type structure of the piezoelectric vibrator includes a structure in which a piezoelectric element is directly incorporated into a case corresponding to surface mounting, and a lead type cylindrical piezoelectric vibrator, which is fixed to a lead frame and insert-molded with a resin. Is roughly divided into a structure in which the lead of the lead type cylindrical piezoelectric vibrator is cut and formed. The present invention relates to the latter structure.
[0003]
FIG. 1 is a front view of a typical surface mount type piezoelectric vibrator insert-molded with resin according to the prior art, and FIG. 2 is a top view thereof. A lead type cylindrical piezoelectric vibrator insert-molded inside the resin and a lead The frame is displayed as a dotted line. 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. In the surface mount type piezoelectric vibrator, the leads 2 and 3 of the lead type cylindrical piezoelectric vibrator 1 are fixed to the terminal portions 4 and 5 which are electrodes of the surface mount type piezoelectric vibrator of the lead frame by resistance welding or laser welding. Step, Step of insert molding with resin 8 leaving electrodes 4 and 5 and terminals 6 and 7, Step of separating electrodes 4 and 5 and terminals 6 and 7 from the lead frame, Bending of electrodes 4 and 5 and terminals 6 and 7 Then, the electrode 4 and 5 and one end of the terminals 6 and 7 are disposed under the resin 8. The model number, date of manufacture, and the like are printed on the upper surface of the surface mount piezoelectric vibrator. (For example, see Patent Document 1)
[0004]
FIG. 3 is a front view of a surface mount type piezoelectric vibrator in which the lead of a typical lead type cylindrical piezoelectric vibrator according to the prior art is cut and formed, and FIG. 4 is a top view. The leads 12 and 13 are cut and formed. The model number, date of manufacture, etc. are printed on the surface of the cylindrical piezoelectric vibrator. (For example, see Patent Document 2)
[0005]
[Patent Document 1]
JP-A-08-023252 [Patent Document 2]
Japanese Patent Laid-Open No. 11-136078
[Problems to be solved by the invention]
In the surface mount type piezoelectric vibrator insert-molded with the above-mentioned resin, the lead-type cylindrical piezoelectric vibrator is deformed or broken by the resin pressure at the time of insert molding, or the resin surface is warped due to resin shrinkage after molding. There is a problem that the appearance of the lead type cylindrical piezoelectric vibrator is exposed due to the occurrence of sink marks or insufficient filling of the resin. In addition, in a surface-mount type piezoelectric vibrator in which the lead of a lead-type cylindrical piezoelectric vibrator is cut and formed, the vibrator surface has a curved surface. Therefore, when the lead is cut and formed, the rotation and displacement of the vibrator In this case, there is a problem in that a cut and forming defect in the case, a suction error at the time of mounting, and a mounting position shift occur.
[0007]
An object of the present invention is to eliminate defects peculiar to a surface mount piezoelectric vibrator in which the lead of a surface mount piezoelectric vibrator insert-molded and a lead type cylindrical piezoelectric vibrator is cut and formed in a surface mount piezoelectric vibrator. Another object of the present invention is to provide a thin, small, and low-cost surface-mount piezoelectric vibrator.
[0008]
[Means for Solving the Problems]
A method of manufacturing a surface-mounted piezoelectric vibrator,
A step of covering a cylindrical portion of a lead-type cylindrical piezoelectric vibrator having two leads at one end with a cylindrical thermoplastic resin molded product;
A process of forming at least one or more flat portions on the thermoplastic resin molded product by pressing and deforming a member having a flat surface on the thermoplastic resin molded product while the thermoplastic resin molded product is heated. When,
Cutting and forming the lead on the basis of the planar portion;
A method of manufacturing a surface-mount type piezoelectric vibrator characterized by comprising:
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 5 is a front view of a surface-mounted piezoelectric vibrator according to an embodiment of the present invention, FIG. 6 is a top view, and FIG. 7 is a side view. The lead-type cylindrical piezoelectric vibrator 11, the thermoplastic resin 17 having a flat surface 18 formed on the upper surface and a flat surface 19 formed on the lower surface by heating, and leads 22 and 23 cut and formed are displayed. FIG. 8 is a perspective view of a thermoplastic resin molded article 20 that covers a surface-mount piezoelectric vibrator according to an embodiment of the present invention.
[0010]
FIG. 10 is a diagram in which a surface-mount piezoelectric vibrator according to an embodiment of the present invention is fixed to a substrate. If the length of the thermoplastic resin molded product 20 is shorter than the length of the lead type cylindrical piezoelectric vibrator 11, the tip of the lead type cylindrical piezoelectric vibrator 11 is exposed from the thermoplastic resin 17, and the substrate 26 is mounted during mounting. Can be fixed with solder 25.
[0011]
FIG. 9 is a front view in the middle of the manufacturing process of the surface mount piezoelectric vibrator according to another embodiment of the present invention. After the lead type cylindrical piezoelectric vibrator 11 is completed, a state in which the thermoplastic resin molded product 20 is put on the lead type cylindrical piezoelectric vibrator 11 manually or by an automatic machine is illustrated. Since the space in which the lead type cylindrical piezoelectric vibrator 11 enters the thermoplastic resin molded product 20 is larger than the diameter of the lead type cylindrical piezoelectric vibrator 11, the lead type cylindrical piezoelectric vibrator 11 is molded with thermoplastic resin. It can be used when the product 20 is covered, can be efficiently operated manually or with an automatic machine, and the lead-type cylindrical piezoelectric vibrator 11 and the stems 22 and 23 are not deformed. At this time, if the lead-type cylindrical piezoelectric vibrator 11 is in a vertical state with being attached to the dedicated jig 9, it is easier to work.
[0012]
FIG. 11 is a front view of a heating plate according to an embodiment of the present invention, and FIG. 12 is a top view of the heating plate according to an embodiment of the present invention. The thermoplastic resin molded product 20 is sandwiched by a heating plate 30 in which two sheets heated by a heater face each other in parallel with the leads 22 and 23 of the lead type cylindrical piezoelectric vibrator 11, and the thermoplastic resin is heated by heat. The molded product 20 is deformed while being melted, crushed to a certain size, and then the heating plate 30 is slowly removed. As a result, the lead type cylindrical piezoelectric vibrator 11 and the thermoplastic resin 17 are fixed, and the flat surfaces 18 and 19 are formed on the surface of the thermoplastic resin 17. At this time, the heating plate 30 has positioning protrusions 31, 32, 33, 34, 35, 36, 37, 38 (36 and 38 are not shown) for the lead type cylindrical piezoelectric vibrator 11, The vibrator 11 is not displaced and does not become defective, and the thickness of the flat surfaces 18 and 19 of the thermoplastic resin 17 is adjusted according to the dimensions of the protrusions 31, 32, 33, 34, 35, 36, 37, and 38. The size can be reduced and the thickness can be reduced by making the dimensions that can obtain the minimum strength.
[0013]
Further, the lead type cylindrical piezoelectric vibrator 11 is deformed or broken by the resin pressure at the time of insert molding, the resin surface warps or sinks due to the resin shrinkage after molding, the lead type cylindrical type due to insufficient resin filling. Appearance defects such as exposure of the piezoelectric vibrator 11 are eliminated.
[0014]
Thereafter, the leads 22 and 23 are cut and formed with reference to the flat surfaces 18 and 19 of the thermoplastic resin 17. At this time, the rotation and misalignment of the lead-type cylindrical piezoelectric vibrator 11 are eliminated, and the cut and forming defects of the leads 22 and 23 are reduced. Also, the suction error and the misalignment of the mounting due to the curved surface shape of the attracting surface for the user. The problem that occurs is also eliminated.
[0015]
In the description of the present embodiment, the cross-sectional shape of the thermoplastic resin molded product 20 has been described as a cylindrical shape. However, the outer side may be square and the inner side may be circular, the outer side may be circular and the inner side may be square, or both the outer side and inner side may be square. The resin molding mold can be manufactured at a low cost and does not cause molding defects. Moreover, although the heating method of the thermoplastic resin molded product 20 has been described with the heating plate 30 using a heater, other heating methods such as ultrasonic heating or high frequency induction heating may be used.
[0016]
【The invention's effect】
According to the present invention, the lead type cylindrical piezoelectric vibrator is deformed or broken due to the resin pressure at the time of insert molding, the resin surface warps or sinks due to the resin shrinkage after molding, the lead type cylinder due to insufficient resin filling. Surface mount type crystal resonators with reduced external appearance defects such as exposed piezoelectric resonators, lead cut and forming defects, and no mounting error or mounting position misalignment due to the curved shape of the suction surface. can get.
[0017]
According to the present invention, the lead type cylindrical piezoelectric vibrator is deformed or broken due to the resin pressure at the time of insert molding, the resin surface warps or sinks due to the resin shrinkage after molding, the lead type cylinder due to insufficient resin filling. Appearance defects such as exposed piezoelectric vibrators and lead cutting and forming defects are reduced, and there is no suction error or mounting position deviation due to the curved surface shape of the suction surface, and the tip is soldered to the board. A surface-mount crystal unit that can be fixed is obtained.
[0018]
According to the present invention, the lead type cylindrical piezoelectric vibrator is deformed or broken due to the resin pressure at the time of insert molding, the resin surface warps or sinks due to the resin shrinkage after molding, the lead type cylinder due to insufficient resin filling. Of surface mount type crystal resonators with reduced external appearance defects such as exposed piezoelectric vibrators and lead cut and forming defects, and also that there is no suction error or mounting position deviation due to the curved surface shape of the suction surface for the user. A manufacturing method is obtained.
[Brief description of the drawings]
FIG. 1 is a front view of a typical surface-mount piezoelectric vibrator according to the prior art. FIG. 2 is a top view of a typical surface-mount piezoelectric vibrator according to the prior art. FIG. FIG. 4 is a front view of a typical surface mount piezoelectric vibrator according to the prior art. FIG. 5 is a front view of a surface mount piezoelectric vibrator according to the present invention. FIG. 7 is a side view of the surface-mounted piezoelectric vibrator according to the present invention. FIG. 8 is a thermoplastic film covering the surface-mounted piezoelectric vibrator according to one embodiment of the present invention. FIG. 9 is a perspective view of a surface-mount type piezoelectric vibrator according to another embodiment of the present invention. FIG. 10 is a front view of the surface mount type piezoelectric vibrator according to an embodiment of the present invention. FIG. 11 is a view of a heating plate according to an embodiment of the present invention. Top view of a heating plate which is an embodiment of a rear view and FIG. 12 the present invention EXPLANATION OF REFERENCE NUMERALS
DESCRIPTION OF SYMBOLS 1 Lead type cylindrical piezoelectric vibrator 2 Lead 3 Lead 4 Electrode 5 Electrode 6 Terminal 7 Terminal 8 Thermoplastic resin 9 Dedicated jig 11 Lead type cylindrical piezoelectric vibrator 12 Lead 13 Lead 17 Thermoplastic resin 18 Plane of thermoplastic resin Part 19 Plane part 20 of thermoplastic resin 22 Molded thermoplastic resin 22 Lead 23 Lead 25 Solder 26 Substrate 30 Heating plate 31 Projection 32 Projection 33 Projection 34 Projection 35 Projection 36 Projection 37 Projection 38 Projection

Claims (1)

A method of manufacturing a surface-mounted piezoelectric vibrator,
A step of covering a cylindrical portion of a lead-type cylindrical piezoelectric vibrator having two leads at one end with a cylindrical thermoplastic resin molded product;
A process of forming at least one or more flat portions on the thermoplastic resin molded product by pressing and deforming a member having a flat surface on the thermoplastic resin molded product while the thermoplastic resin molded product is heated. When,
Cutting and forming the lead on the basis of the planar portion;
A method for manufacturing a surface-mounted piezoelectric vibrator, comprising:

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