JP2000209059A - Piezoelectric oscillator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically determine the positions of a lead terminal derived from an oscillator and a solderable tube-shaped auxiliary terminal by attaching the auxiliary terminal capable of inserting the lead terminal to the top end of the lead terminal. SOLUTION: After the bending work of a lead terminal 1, a tube-shaped auxiliary terminal 6 is assembled at a top end part rather than the bent part of the lead terminal 1. The top end of the lead terminal 1 is inserted for about the half length of the tube-shaped auxiliary terminal 6, and the lead terminal 1 and the tube-shaped auxiliary terminal 6 are fixed and conducted near the inserting port of the tube-shaped auxiliary terminal 6 by any fixing means such as soldering, adhering, press-fitting or welding. Afterwards, a taped crystal oscillator is cut on A-A and packaged on a circuit board. When the lead terminal 1 is not inserted to the cutting part, the hollow tube-shaped auxiliary terminal 6 is crashed and deformed at the time of cutting and a cutting end face is not circular so that packaging onto the circuit board is made difficult. Therefore, the lead terminal 1 is inserted to the cutting part of the tube-shaped auxiliary terminal 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric vibrator.

[0002]

2. Description of the Related Art Piezoelectric vibrators, particularly quartz vibrators, are used as clock sources in many industries. Although there are many types of crystal resonators, the crystal resonator according to the present invention has a cylindrical main body, and two lead terminals are led out from one end of the cylindrical crystal resonator. Things.
FIG. 1 is a completed perspective view of a cylindrical vibrator, which is composed of a hermetic terminal composed of two lead terminals 1, an insulating member 2, a metal ring 3, and a cylindrical sealing tube 4, and has a quartz crystal inside. A piece (not shown) is stored. Since the main body is small and can be manufactured at low cost, the demand has been increasing in recent years. Typical dimensions are as follows: outer diameter of sealing tube is 3.0 mm, length is 9.0 mm, outer diameter of lead terminals is 0.32 mm, and lead terminal interval is 1.1 mm.
(Referred to as 309), the outer diameter of the sealing tube is 2.0 mm, the length is 6.0 mm, the outer diameter of the lead terminals is 0.26 mm, and the lead terminal interval is 0.7 mm (referred to as 206).

FIG. 2 is a perspective view of a quartz resonator having a shape different from that of FIG. 1, and has been frequently used. The shape of the vibrator has been standardized and JIS C6701-
For the 49 type according to 1995, A = 11.1 mm, B =
5.0 mm or less, C = 4.88 mm ± 0.2 mm, D =
0.43 mm and E = 13.5 mm. This crystal resonator, which has been the mainstream in the past, is gradually being replaced by the cylindrical resonator shown in FIG. 1 for the above-described reason.

[0004] The work of mounting electronic components on a circuit board has been improved, automation has been advanced, and it has been required that the electronic components be maintained in a state in which they can be mounted automatically, and the crystal oscillator as shown in FIGS. 1 and 2 is also taped. It is becoming. FIGS. 3 and 4 are a front view (A) and a side view (B) of a part of a crystal resonator taped, and the crystal resonator of FIG.
The reference numeral 309 indicates the type of crystal resonator shown in FIG. The crystal resonator 309 is formed by molding two lead terminals 1 so that the lead terminal interval is 4.88 mm and cutting off the tip so that the crystal resonator 309 is compatible with a circuit board for mounting a 49-type device. An auxiliary terminal 5 thicker than the terminal is attached and fixed by welding.

In the taping, the lead terminals of the crystal unit are placed at a predetermined interval on the master tape 11, and the lead terminals are fixed by the fixing tape 12. Type 49 taping is possible with thick and stable lead terminals.
In 9 and 206, the lead terminal is also thinly bent and the taping portion becomes unstable. Therefore, the lead terminal is bent and cut to a predetermined length, and a thick auxiliary terminal for taping is attached to the leading end of the cut lead terminal. Taping after butt welding. Auxiliary terminals having the same thickness as the 49-type lead terminals are used.

[0006]

Butt welding of a lead terminal and an auxiliary terminal is technically difficult and requires a lot of man-hours.

There is spot welding in which lead terminals and auxiliary terminals are overlapped, but overlap welding of round bars is difficult.
In addition, since a step is formed in the welded portion, a conditional assembly structure such as making the hole of the circuit board larger when inserting the hole into the hole of the circuit board or inserting the hole up to the step is required.

[0008]

SUMMARY OF THE INVENTION A solderable tubular auxiliary terminal into which a lead terminal can be inserted is attached to the tip of a lead terminal derived from a cylindrical piezoelectric vibrator.

The lead terminal is bent, and the tube-shaped auxiliary terminal is attached to the tip of the portion to be inserted into the circuit board.

In a piezoelectric vibrator which cuts off the tip of the tubular auxiliary terminal and solders it to the circuit board, the lead terminal tip is inserted deeper than the cut portion of the tubular auxiliary terminal. At the cutting portion, the lead terminal and the tubular auxiliary terminal are simultaneously crimped at the time of cutting.

[0011]

5A and 5B are a front view (A) and a side view (B) in which a tubular auxiliary terminal is assembled at the leading end from the bent portion of the lead terminal after bending the lead terminal 309. FIG. . The distal end of the lead terminal 1 is inserted to about half the length of the tubular auxiliary terminal 6, and the lead terminal and the tubular shape are fixed near the insertion opening of the tubular auxiliary terminal by soldering, bonding, crimping, welding, or the like. The auxiliary terminal is fixed and conductive.

Thereafter, the crystal resonator that has been taped is cut along the line AA in FIG. 5A and mounted on a circuit board. If the lead terminal is not inserted into the cut portion, the hollow tubular auxiliary terminal is crushed and deformed at the time of cutting, and the contact cross section is not circular. Since it is difficult to mount the lead terminal on the circuit board, it is preferable that the lead terminal is inserted up to the cut portion of the tubular auxiliary terminal. Then, it is desirable to crimp the lead terminal and the tubular auxiliary terminal at the time of cutting. FIG. 6 is a front view showing a cut state. Reference numeral 20 denotes a terminal support,
Reference numeral 1 denotes a jig for pressing the lead terminal 1 and the tubular auxiliary terminal 6 in cooperation with the terminal receiving base 20, and reference numeral 22 denotes a cutter. The terminal is cut in a state where the terminal is fixed by the terminal receiving stand 20 and the crimping jig 21. The tube-shaped auxiliary terminal may be made of any material that can be soldered, but copper is preferably used in consideration of workability.

FIG. 7 is a partial cross-sectional view in which the tube-shaped auxiliary terminal portion of the quartz oscillator is inserted into the hole 8 of the circuit board 7 and fixed with solder 9. In this embodiment, the tube-shaped auxiliary terminals have the same spacing and the same thickness as between the 49-type lead terminals, but it goes without saying that the spacing and the thickness of the tubular auxiliary terminals can be set as needed.

[0014]

Since the tubular auxiliary terminal is inserted and fixed at the end of the lead terminal, the auxiliary terminal can be easily connected and fixed without the need for a difficult work such as butt welding or lap welding. Since the lead terminal is inserted into the tubular terminal, the positioning of the lead terminal and the tubular auxiliary terminal is automatically determined, so that no displacement occurs.

Since the auxiliary terminal can be inserted into the vicinity of the bent portion of the lead terminal, the insertion portion into the circuit board can be located near the crystal unit. That is, the terminal part to be inserted into the hole of the circuit board can be a tubular auxiliary terminal part (see FIG. 7), and the mounting height of the crystal unit can be minimized.

By inserting the distal end of the lead terminal beyond the cut portion of the tubular auxiliary terminal, the cut portion of the tubular auxiliary terminal is not deformed, and the insertion into the circuit board becomes easy.

By crimping the lead terminal and the tubular auxiliary terminal simultaneously at the time of cutting the terminal, the lead terminal and the tubular auxiliary terminal can be securely fixed and the conduction can be ensured.

[Brief description of the drawings]

FIG. 1 is a completed perspective view of a cylindrical vibrator.

FIG. 2 is a perspective view of a crystal unit.

FIG. 3 is a front view (A) and a side view (B) of a part in which a crystal unit is taped.

FIG. 4 is a front view (A) and a side view (B) of a part in which a crystal unit is taped.

FIG. 5 is a front view (A) and a side view (B) in which a tube-shaped auxiliary terminal is assembled at a tip portion from a bent portion of the lead terminal after bending the lead terminal of 309;

FIG. 6 is a front view showing a cutting state.

FIG. 7 is a partial cross-sectional view in which a tube-shaped auxiliary terminal portion of a crystal unit is inserted into a hole 8 of a circuit board 7 and fixed with solder 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead terminal 2 Insulating member 3 Metal ring 4 Sealing tube 5 Auxiliary terminal 6 Tubular auxiliary terminal 7 Circuit board 8 Hole 9 Solder 11 Master tape 12 Fixing tape 20 Terminal holder 21 Crimping jig 22 Cutter

Claims (4)

[Claims] 1. A piezoelectric vibrator wherein a solderable tubular auxiliary terminal capable of inserting a lead terminal is attached to a leading end of a lead terminal derived from a cylindrical piezoelectric vibrator. 2. The piezoelectric vibrator according to claim 1, wherein the lead terminal is bent, and the tubular auxiliary terminal is attached to a tip of a portion to be inserted into the circuit board. 3. A piezoelectric vibrator which cuts off the tip of a tubular auxiliary terminal and solders it to a circuit board, wherein the lead terminal tip is inserted deeper than a cut portion of the tubular auxiliary terminal. 3. The piezoelectric vibrator according to 1 or 2. 4. The piezoelectric vibrator according to claim 3, wherein the lead terminal and the tubular auxiliary terminal are crimped at the cut portion.