JPH11136079A - Tuning fork type quartz resonator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the generation of solder balls which are formed between an insulating member top surface of an airtight terminal and a base part bottom of a tuning fork type quartz resonator. SOLUTION: This resonator consists of an airtight terminal which positions and fixes lead wires that serve as at least two supporting members to a metallic ring with an insulating member, a tuning fork quartz piece and a sealed tube, also adjacently arranges a base part bottom of the tuning fork quartz piece on an insulating member top surface of the airtight terminal and solders the tuning fork quartz piece and the lead wires. In such cases, a projecting part 9 that receives the base part bottom of the tuning fork quartz piece is provided at the center part on top surface of the insulating member of the airtight terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a tuning-fork type crystal resonator.

[0002]

2. Description of the Related Art A tuning fork type crystal resonator is used for a clock, a calculator,
It is widely used for computer equipment, information equipment, etc. At present, the cylinder type is the mainstream, and the finished outer diameter is typically 3 mm in diameter, 8 mm in length, 2 mm in diameter, and 6 mm in length. There is not much difference in the contents, only the size is different.

FIG. 1 is a perspective view of a tuning-fork type quartz resonator with a sealing tube removed, and FIG. 2 is a perspective view of a tuning-fork type quartz piece with electrodes formed on the surface thereof. Tuning fork type crystal blank with electrode formed 1
Are fixed by solder 3 to a lead wire 2 which also serves as two support members of the airtight terminal. The electrodes are an excitation electrode 8 formed on the branch of the tuning fork and a fixing electrode 8 formed on the base of the tuning fork.
'.

FIG. 3 is a front view of the carrier, FIG. 4 is a front view of the set jig, FIG. 5 is a perspective view of the airtight terminal, and FIG.
FIG. 4 is a partial cutaway view of a perspective view in which a carrier and a setting jig are set. A method of assembling the tuning-fork type crystal resonator will be described with reference to FIGS. Although four airtight terminals 4 are set in FIG. 3 for the purpose of explanation, in practice, ten or twenty terminals can be used, and any number may be used. FIG. 4 is a front view of the tuning fork type crystal piece 1 set on the tuning fork type crystal piece setting jig (B). (The number of sets is the same as in the description of FIG. 3 and is the same in FIG. 6.) The portion where the tuning fork type crystal blank 1 is set is a concave portion. To fall. FIG. 5 is a perspective view in which the solder 7 is attached to the upper surface of the airtight terminal 4. The solder paste 7 is applied to the upper surface of the insulating member 6 between the two lead wires 2. 5 is placed on the upper surface of the hermetic terminal 4 set as shown in FIG.
Attach solder as shown. FIG. 6 is a partial cutaway view of a perspective view in which the carrier (A) and the setting jig (B) after the above-described steps are set. In the state shown in FIG. 6, the tuning fork type crystal blank 1 set on the jig slides down between the two lead wires 2 and rides on the applied solder 7.

When the portion of the solder 7 is heated in the above-described state, the solder 7 is melted and attached to the lead wire and the electrode formed on the tuning-fork type crystal blank 1 due to the surface tension and wettability of the solder 7.
The solder between the two lead wires is separated. For this reason, it is possible to initially attach the solder 7 over two lead wires.

[0006]

The torsion solder is separated on both sides of the tuning fork type crystal blank and the tuning fork type crystal blank is fixed to the lead wire and the electrode. The torsion solder sandwiched between the bottom surface of the base of the mold crystal blank and the upper surface of the insulating member of the airtight terminal may be melted while being sandwiched to form a solder ball. It has been difficult to control the temperature conditions and the blowing conditions in the heating process for preventing the generation of solder balls.

FIG. 7 is a partial front view of the tuning-fork type crystal resonator. This shows a state in which a solder ball 7 ′ is formed between the upper surface of the insulating member 6 (commonly made of Kovar glass) of the hermetic terminal 4 and the bottom surface of the base of the tuning-fork type crystal blank 1. (The solder attached to the lead wire and the electrode is omitted.) When the solder ball 7 'is present, the tuning-fork type crystal piece is in a floating state. Although the floating of the tuning-fork type quartz piece does not cause much problem, if the solder ball 7 ′ comes off between the upper surface of the insulating member 6 and the base bottom face of the tuning-fork type quartz piece 1 after sealing, the frequency may shift or stop. Sometimes.

[0008]

Means for Solving the Problems At least an airtight terminal, in which a lead wire serving also as two supporting members is positioned and fixed to a metal ring with an insulating member, a tuning fork type crystal piece, and a sealing tube, are provided. In the tuning fork type crystal resonator in which the base bottom of the piece is arranged close to the upper surface of the insulating member of the hermetic terminal and the lead wire is soldered to the tuning fork type crystal piece, the tuning fork type crystal piece is provided at the center of the upper surface of the insulating member of the hermetic terminal. A convex portion for receiving the bottom surface of the base.

[0009]

FIG. 8 is a perspective view of a hermetic terminal showing a first embodiment of the present invention. 2 on the upper surface of the insulating member of the hermetic terminal
A convex portion 9 made of an insulating member is formed between the lead wires.

FIG. 9 is a perspective view of a hermetic terminal showing a second embodiment of the present invention. A pointed projection 10 is formed between the two lead wires on the upper surface of the insulating member of the hermetic terminal.

FIG. 10 is a perspective view of an airtight terminal according to a third embodiment of the present invention. Between the two lead wires on the upper surface of the insulating member of the hermetic terminal, a protruding portion 11 made of an insulating member is formed to be elongated in a direction substantially orthogonal to the line connecting the two lead wires.

The assembling method is the same as that of the prior art, and the torsion solder applied between the two lead wires is separated into two by the surface tension and attached to the lead wire and the fixing electrode. In the hermetic terminal of the first embodiment, the overlapping area between the upper surface of the convex portion of the insulating member and the bottom surface of the base of the tuning-fork type crystal blank is reduced, and the solder ball generated by the conventional technique is in contact with the upper surface of the insulating member of the hermetic terminal and the tuning fork. It is very rarely formed between the base bottom surfaces of the shaped quartz pieces. In the hermetic terminal of the second embodiment, the point is that the upper surface of the convex portion of the insulating member and the bottom surface of the base of the tuning-fork type quartz piece overlap with each other. It is not formed between the base bottom surfaces of the tuning fork type quartz pieces.

The hermetic terminal according to the third embodiment is a method for assembling the solder solder in which the supply of the solder paste is divided into both sides of the elongated protrusion, and preferably the solder paste is supplied so that the solder is higher than the protrusion centering on the lead wire. use. Two torsion solders supplied by the protrusions of the insulating member are shielded and do not mix with each other, and since no torsion solder is supplied to the upper surface of the protrusions of the insulation member, the upper surface of the insulation member of the hermetic terminal and the tuning fork crystal It is not formed between the bases of the pieces.

[0014]

The steps of setting the carrier on the airtight terminal, setting the tuning fork type crystal blank on the jig, supplying the solder paste to the upper surface of the airtight terminal, and setting the carrier and the jig Even in the method of assembling a tuning fork type crystal resonator comprising a step of applying heat, the occurrence of solder balls between the upper surface of the insulating member of the hermetic terminal and the bottom surface of the tuning fork type crystal piece can be extremely reduced or eliminated. it can. For this reason, the control of the heating step became easy.

Since no solder ball is generated, the frequency change and stoppage due to the detachment of the conventional solder ball from the bottom surface of the base of the tuning-fork type quartz piece are eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a tuning-fork type crystal resonator with a sealing tube removed.

FIG. 2 is a perspective view of a tuning-fork type crystal piece having electrodes formed thereon.

FIG. 3 is a front view of the carrier.

FIG. 4 is a front view of a set jig.

FIG. 5 is a perspective view of an airtight terminal.

FIG. 6 is a partially broken view of a perspective view in which a carrier and a setting jig are set.

FIG. 7 is a partial front view of a tuning fork type crystal resonator.

FIG. 8 is a perspective view of an airtight terminal having a protrusion formed on an insulating member between leads.

FIG. 9 is a perspective view of an airtight terminal having a protrusion formed on an insulating member between leads.

FIG. 10 is a perspective view of an airtight terminal having a protrusion formed by an insulating member which is elongated in a direction substantially perpendicular to a line connecting two lead wires between leads;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tuning fork type crystal piece 2 Lead wire 3 Solder 4 Airtight terminal 5 Metal ring 6 Insulating member 7 Solder solder 7 'Solder ball 8 Exciting electrode 8' Fixing electrode 9 Convex part of insulating member 10 Convex of insulating member Part 11 Convex part of insulating member

Claims (2)

[Claims] 1. A bottom surface of a base of a tuning-fork type crystal piece, which comprises at least an airtight terminal in which a lead wire serving also as two support members is positioned and fixed to a metal ring with an insulating member, a tuning fork type crystal piece, and a sealing tube. Is placed close to the top surface of the insulating member of the hermetic terminal, and the tuning fork type crystal piece is soldered to the lead wire. A tuning-fork type crystal resonator characterized by having a convex portion for receiving. 2. A step of setting a hermetic terminal on a carrier, a step of setting a tuning fork type crystal blank on a jig, a step of supplying solder paste to an upper surface of the hermetic terminal, and a step of setting the carrier and the jig 2. The tuning fork type crystal resonator according to claim 1, wherein the crystal is assembled by a step of applying heat.