JP2000134057A - Structure and manufacture of airtight terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the fixing of a crystal resonator strong and stable by alternately and also flatly molding the shapes of metallic lead end parts fixing the piezoelectric element of an airtight terminal into a V shape or a Y shape with the center of the lead as reference. SOLUTION: A metallic header 2, an insulation member and two leads 1 are positioned and fixed. Next, the end part of a lead 1 is crushed to be flat with a press, etc., to form a fixing part 8. Then, a notch 9 is provided in the longitudinal direction of the lead 1 in the center of a flat fixing part 8. In such a case, the notch 9 is formed by a cutter, laser beams, etc. And, the flat parts divided into two by the notch 9 are formed into a V shape, a Y shape or a U shape. In such a case, it is preferable that the two leads 1 are alternately and also flatly formed by a press with the center of the leads 1 as reference at the same time. Each process is performed with an airtight terminal fixed to a jig. And, the end part of a rectangular crystal resonator is fixed by being held between the fixing part 8 formed in the V shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a hermetic terminal and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 1 is a front view and a top view of a hermetic terminal for mounting a small crystal unit according to the prior art. The hermetic terminal is composed of an insulating member 3, two metal leads 1 and 1 penetrating the insulating member 3, and a metal header 2 surrounding the periphery of the insulating member. The insulating member 3 is generally made of glass, and a metal header 2 and two metal leads (hereinafter simply referred to as leads) 1 and 1 are positioned by a jig, and the glass is melted and hermetically bonded.

FIG. 2 is a perspective view showing a structure in which one end of a rectangular crystal resonator 4 is fixed to leads 1 and 1 on one side. FIG. 3 is a perspective view showing a structure in which an end of a rectangular crystal unit 5 is inserted between two leads 1 and 1 and fixed. The structure shown in FIG. 2 is easy to manufacture, but has difficulty in fixing force and is vulnerable to impact in the direction without leads. In FIG. 3, the fixing force can be secured, but the assembling workability is poor and automation is difficult.

A structure of a hermetic terminal that solves the above-mentioned disadvantage has been proposed. For example, Japanese Utility Model Application Laid-Open No. 61-182118 discloses a hermetic stem for a crystal unit including at least two metal leads penetrating an insulating glass and a metal ring or a flange surrounding the periphery of the insulating glass. An airtight terminal is disclosed in which a wedge-shaped fixing portion is provided at an end of a metal lead on a side to which a vibrator is fixed, and the end of the wedge-shaped fixing portion is embedded in insulating glass. The mechanical strength is improved. FIG. 4 is a top view of the hermetic terminal of the embodiment and a cross-sectional view of a metal lead portion. A wedge-shaped fixing portion 7 is formed at an end of the lead 6.

[0005]

The positioning of a metal lead having one end formed in a wedge shape and embedding it in insulating glass is extremely poor in workability. If the wedge-shaped directions of a pair of leads are not uniform, a crystal vibration occurs. It is difficult to fix the child, which causes variation in mass production.

[0006] If there is a variation in the fixing, the characteristics of the crystal unit will vary, and even if the mechanical strength of the fixing is improved, there will be many disadvantages. SUMMARY OF THE INVENTION It is an object of the present invention to provide an airtight terminal capable of solving the above-mentioned drawbacks and fixing a crystal oscillator firmly and stably.

[0007]

SUMMARY OF THE INVENTION A piezoelectric element is fixed as an airtight terminal comprising an insulating member, at least two leads penetrating through the insulating member, and a metal header surrounding the peripheral portion of the insulating member. The ends of the metal leads are alternately and flatly formed in a V-shape or a Y-shape based on the center of the lead.

A step of positioning and fixing a metal header, an insulating member, and a plurality of leads; a step of flattening the ends of at least two leads; and a notch in a longitudinal direction of a center lead in the flat portion. And a step of forming a flat portion divided into two by the notch into a V-shape or a Y-shape.

[0009]

FIG. 5 is a view for explaining the manufacturing method of the present invention. FIGS. 5A to 5C are front views of the hermetic terminal after each step, and FIG. 5D is a side view.

FIG. 1A shows an airtight terminal after a step of positioning and fixing a metal header 2, an insulating member, and two leads 1 and 1. The manufacturing method is the same as that of the prior art. (B) is an airtight terminal in which the fixing portion 8 is formed by flattening the end of the lead 1 by pressing or the like. (C) is an airtight terminal after the step of providing a notch 9 in the longitudinal direction of the center lead 1 of the flat fixing portion 8. The notch is formed by a cutter, a laser beam or the like. (D) The hermetic terminal after the step of forming the flat portion divided into two by the notch into a V-shape, a Y-shape or a U-shape. In this case, it is a preferable manufacturing method that two leads are simultaneously formed by pressing alternately and flatly on the basis of the centers of the leads. Each process is performed by fixing the airtight terminal to a jig.

FIG. 6 is a front view in which a rectangular crystal resonator is fixed to the hermetic terminal of the present invention. Since the ends of the rectangular crystal unit are fixed by a structure sandwiched between V-shaped fixing parts, they can be securely and firmly fixed. Although the present invention has been described with respect to a hermetic terminal for a crystal oscillator, it goes without saying that the present invention is not limited to a crystal oscillator and can be applied to all hermetic terminals for directly fixing elements to leads. Even in a structure having three or more leads, the fixing portion may be processed only for the element fixing leads.

[0012]

According to the present invention, since the fixing portion is formed after the hermetic bonding, the lead shape at the time of hermetic sealing is simple (in the embodiment, a round bar), and the positioning and fixing work is easy.

Since the fixed portion is formed after the hermetic joining, there is no variation in the fixed portion after completion, and the assembly of the crystal unit is stabilized, and as a result, the characteristics of the crystal unit are also stabilized.

Since the flat portion of the fixed portion and the flat portion of the crystal unit coincide with each other, the area of the pointing unit is increased, the fixing of the crystal unit and the fixed unit is stabilized, and the mechanical strength of the fixed unit is improved.

[Brief description of the drawings]

FIG. 1 is a front view and a top view of a hermetic terminal for mounting a small crystal resonator according to the prior art.

FIG. 2 is a perspective view showing a structure in which one end of a rectangular crystal resonator 4 is fixed to leads 1 and 1 on one side.

FIG. 3 is a perspective view of a structure in which an end portion of a rectangular crystal resonator 5 is inserted and fixed between two leads 1 and 1;

FIG. 4 is a top view of a hermetic terminal according to the prior art and a cross-sectional view at a metal lead portion.

FIG. 5 is a diagram for explaining the manufacturing method of the present invention (A).
(C) is a front view of the hermetic terminal after each step, and (D) is a side view.

FIG. 6 is a front view in which a rectangular crystal resonator is fixed to the hermetic terminal of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead 2 Metal header 3 Insulating member 4 Rectangular crystal oscillator 5 Rectangular crystal oscillator 6 Lead 7 Wedge-shaped fixing part 8 Fixed part 9 Notch

Claims (2)

[Claims] A metal terminal for fixing a piezoelectric element of an airtight terminal comprising an insulating member, at least two metal leads penetrating the insulating member, and a metal header surrounding a peripheral portion of the insulating member. A structure of a hermetic terminal, wherein lead ends are formed in a V-shape or a Y-shape alternately and flatly with reference to the center of a metal lead. 2. A step of positioning and fixing a metal header, an insulating member, and a plurality of metal leads; a step of flattening ends of at least two metal leads; A method for manufacturing an airtight terminal, comprising: a step of providing a notch in a longitudinal direction of a lead made by a lead; and a step of forming a flat portion divided into two by the notch into a V-shape.