JPS6024014Y2 - Stem of crystal holder - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a stem of a holder for a crystal resonator.

Cold pressure welding type crystal oscillator holders are made by cold pressure welding a stem made of press-molded copper/kovar clad plates and a copper cap to form a sealed space inside. This stem has a cylindrical through-hole at the bottom, through which the lead wire is inserted, and the crystal resonator is supported by this lead wire, and the through-hole through which the lead wire has been inserted is inserted into the stem. The structure is sealed with glass, and the sealed structure of the holder isolates the crystal resonator from the effects of air and external moisture, allowing it to vibrate stably.

However, in conventional cages, when the stem and the cap are cold-welded, the pressure-welded part is crushed and a deformation force is generated that tries to expand in a direction perpendicular to the pressure-welding direction. Because the force was transmitted to the glass that sealed the lead wires, the glass was often damaged.

As a result, air, moisture, etc. could enter through this broken glass, changing the frequency of the crystal resonator.

In order to improve this problem, the present applicant has previously proposed a cage having the structure shown in FIG. 1.

The stem 1 in this configuration is made of copper, and has holes 3, 3' formed at its bottom through which lead wires 2, 2' are inserted, and hollow tubes 4, 4' made of iron with lead wires inserted into the hollow portions of the hollow tubes 4, 4'. ,2
' is passed through, and the hollow part is sealed with glass 5.5' and fitted, and the brazing is fixed.

According to this structure, as mentioned above, the deformation force generated in the stem 1 during cold welding is reliably blocked by the solid and strong hollow cylinders 4, 4', and is not transmitted to the glasses 5, 5' inside the hollow part. .

Therefore, damage to the glasses 5, 5' is prevented, the internal hermetic structure is maintained for a long period of time, and the frequency of the crystal resonator 6 is not affected by ambient atmosphere such as humidity.

However, since the stem 1 is made of a copper plate that can be easily cold-welded like the cap 7, the softness, which is an attribute of copper itself, becomes an adverse condition, and the stem 1 cannot be mechanically bonded.
It has weak physical strength.

Therefore, even a slight mechanical or physical pressure causes the stem 1 to deform, changing the distance between the lead wires 2 and 2', and as a result, the frequency of the crystal resonator 6 changes.

A stem is being considered in which the frequency of the vibrator does not change even under such mechanical or physical pressure.

FIG. 2 shows this, and the stem 10 is made of a material that can be cold-welded, such as a copper plate, and is press-molded into a pot shape, and has a pair of holes 13, 13 provided at appropriate locations in the bottom portion 12.
a frame 11 having a
The holes 13 and 13' are cut away from the iron substrate 14 that closes them.

The bottom portion 12 of the frame 11 and the substrate 14 are fixed to each other by brazing.

A pair of insertion holes 15, 15' are formed in the substrate 14, and lead wires 16.16' are inserted into the insertion holes 15, 15', and soda barium is inserted so as to close the insertion holes 15, 15'. Glass, soda-based glass 17, 17' such as soda lime glass is sealed.

The lead wire 16.16' is made of an iron-nickel alloy, and the crystal oscillator 18 is connected to the end of the lead wire 16.16' inserted into the cage by an appropriate method.

A copper cap 19 is attached to the stem 10 configured in this way.
The stem end edge 10' and the cap end edge 19' are joined by cold pressure welding.

According to the above configuration, since the solid and strong iron substrate 14 is used for the stem 10, the mechanical and physical strength of the stem 10 is high, and even if a somewhat large mechanical or physical pressure is applied to the stem 10, Substrate 14 forming the bottom surface
does not deform or curve, so the distance between the lead wires 16 and 16' remains constant.

Further, the deformation force generated in the copper frame 11 on the stem 10 side in a direction perpendicular to the welding direction when the stem end edge 10' and the cap end edge 19' are cold welded is almost completely blocked by the iron substrate 14. Therefore, the glass 17, 17' is protected from damage.

Therefore, there is no infiltration of air or moisture. However, lead wire 1
Since iron-nickel alloy is used as 6.16',
Since the frequency of the crystal oscillator 18 and the resonant frequency of the lead wire are relatively close to each other, resonance may occur, and the mechanical strength is low, so it is easy to bend and deform. The distance between them may change, making the frequency of the crystal oscillator 18 unstable.

The present invention provides a novel and effective stem in which the frequency of the vibrator does not change even under such mechanical or physical pressure.

An embodiment of the present invention will be described below based on the drawings.

FIG. 3 shows this, and the stem 20 is formed by pressing a material that can be cold-welded, such as a copper plate, into a pan-shaped bottom, and a pair of holes 23, 23 provided at appropriate locations in the bottom 22.
a frame 21 having a
This is caused by the iron substrate 24 that closes the holes 23, 23'.

The bottom portion 22 of the frame 21 and the substrate 24 are fixed to each other by brazing.

A pair of insertion holes 25 and 25' are formed in the substrate 24, and lead wires 26 and 26' are inserted into the insertion holes 25 and 25', and a glass 27 is inserted so as to close the insertion holes 25 and 25'. .27' is sealed.

The lead wires 26, 26' are made of a metal such as Fe-Cr, an iron-chromium alloy, or Kovar KV, which is harder than an iron-nickel alloy.
A crystal resonator 28 is connected to the insertion end into the retainer by an appropriate method.

Further, the glass 27, 27' has a coefficient of thermal expansion equal to or greater than that of the lead wires 26, 26'.

A copper cap 29 is attached to the stem 20 configured in this way.
The stem end edge 20' and the cap end edge 29' are joined by cold pressure welding.
6.26', as shown in Figure 2, if a soft iron-nickel alloy metal wire, which is generally used for this type of glass sealing, is used, it may cause resonance due to the vibration of the crystal resonator, or the product may fall. Since the crystal oscillator 28 is bent and the frequency of the crystal oscillator 28 changes, a harder metal wire such as iron-chromium alloy Fe-Cr or Kovar KV is used.

The present invention is not limited to this metal wire, and any metal wire that is harder than iron-nickel alloy may be used.

According to the above configuration, as in FIG. 2, since the solid and strong iron substrate 24 is used for the stem 20, the mechanical and physical strength of the stem 20 is high, and it can withstand somewhat large mechanical or physical pressure. Even when added to the stem 20, the substrate 24 forming the bottom surface thereof does not deform or curve, and therefore the distance between the lead wires 26, 26' remains constant, so the frequency of the crystal oscillator 28 does not change either. .

Furthermore, the deformation force generated in the copper frame 21 on the stem 10 side in a direction perpendicular to the welding direction when the stem end edge 20' and the cap end edge 29' are cold welded is almost completely blocked by the iron substrate 24. Therefore, the glass 27, 27' is protected from damage.

Therefore, there is no infiltration of air, moisture, etc., and from this point of view, the frequency of the crystal resonator 28 does not change.

Furthermore, since the lead wires 26 and 26' are made of metal wires such as iron-chromium alloy Fe-Cr or Kovar, which are harder than iron-nickel alloys, the resonant frequency of the lead wires is lower than the frequency of the crystal oscillator 28. Since it is located at a high place, it does not resonate and has high mechanical strength, so it is difficult to bend and deform.
As a result, there are almost no factors that change the distance between the lead wires 26 and 26', and the frequency of the crystal resonator 28 is further stabilized.

The thickness of the iron substrate 24 may be determined appropriately so that it will not be deformed or bent by expected mechanical or physical pressure, but since it is inherently strong, a relatively thin one can also be used.

Moreover, since iron material is cheaper than copper/Kovar clad or copper, if most of the stem 20 is occupied by the iron substrate 24 as in the above configuration, there is an advantage that the cost of the cage as a whole can be reduced. .

Further, in the above embodiment, a case was explained in which a pair of holes 23 and 23' were provided in the bottom surface 22 of the copper frame 21, but the present invention is not limited to this. It is sufficient if the frame 21 is partially cut out at a position corresponding to the position 25'.

In summary, according to the present invention, the glass that seals the lead wire insertion hole is protected from damage, preventing moisture etc. from entering the cage, and the strength of the stem is increased, resulting in changes in the distance between the lead wires. This not only eliminates the causes of changes in the frequency of the crystal resonator due to mechanical and physical pressure, but also further reduces the causes of changes in the frequency by making the lead wires in particular harder than iron/nickel alloys. This led to him becoming a distant relative of the intended purpose.

[Brief explanation of the drawing]

Figures 1 and 2 are overall vertical cross-sectional views of a crystal oscillator holder prior to the present invention, and Figure 3 is an overall longitudinal sectional view of the crystal oscillator holder showing details of the main parts of the present invention. be. 21...Frame, 22...Bottom, 2
3.23'...hole, 24...board, 2
5,25'...Insertion hole, 26.26'...
...Lead wire, 27, 27'...Glass, 28
...Crystal unit, 29...Cap.

Claims (1)

[Claim for Utility Model Registration] A pair of insertion holes are formed in an iron substrate, a lead wire to be connected to a crystal oscillator is inserted into the insertion holes and sealed with glass, and the iron substrate is cold pressure welded. In the stem of the crystal oscillator holder, which is mounted and fixed on the bottom of the frame, the stem is made of a material that allows the substrate to have holes corresponding to at least the insertion holes of the substrate, and the lead wire is made of iron or A stem of a crystal oscillator retainer characterized by being made of a metal wire that is harder than a nickel alloy.