JP2011109409A - Package, piezoelectric vibrator, oscillator, electronic apparatus, and radio-controlled clock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a package allowing vacuum sealing to be surely performed, and a piezoelectric vibrator using the same. <P>SOLUTION: This package 1 includes: an airtight terminal 5 including lead terminals 45, 45 for connecting an electronic component 2 thereto, and a plug body 4 fixed to a middle part of the lead terminals 45, 45; and a bottomed tubular case 3 for housing the electronic component 2; wherein an opening of the case 3 is pressed in and fixed to an outer peripheral surface 43 of the plug body 4. In the package, recessed parts 3a or projecting parts 3b extending in an axis C direction of the case 3 are formed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a package, a piezoelectric vibrator, an oscillator, an electronic device, and a radio timepiece.

  In recent years, a piezoelectric vibrator using a crystal or the like is used as a time source, a timing source of a control signal, a reference signal source, or the like in a mobile phone or a portable information terminal device. Various piezoelectric vibrators of this type are provided, and one of them is a piezoelectric vibrator having a cylinder type package formed in a cylindrical shape.

The piezoelectric vibrator of this package includes an airtight terminal, a tuning-fork type piezoelectric vibrating piece, and a bottomed cylindrical case that accommodates the piezoelectric vibrating piece inside.
The hermetic terminal includes a pair of lead terminals to which the piezoelectric vibrating piece is connected and a plug body fixed to an intermediate portion of the lead terminals. The plug body further includes a metal annular metal ring and a glass member that seals the inside of the metal ring. The piezoelectric vibrating piece is sealed inside the case by press-fitting and fixing the opening of the case to the outer peripheral surface of the plug body.

  Here, as described in Patent Document 1, electrical characteristics such as oscillation frequency characteristics and impedance characteristics of the piezoelectric vibrating piece are better when the space is in a vacuum state. Therefore, in order to vacuum seal the piezoelectric vibrating piece with the inside of the case in a vacuum state, the process of sealing the piezoelectric vibrating piece inside the case by press-fitting and fixing the opening of the case to the outer peripheral surface of the plug body is performed in a vacuum chamber ( In a vacuum chamber). Specifically, first, the opening of the case is placed on the metal ring of the plug body. Thereafter, evacuation is performed in a vacuum chamber, and the inside of the case is evacuated. Then, the opening of the case is fixed to the outer peripheral surface of the plug body by press-fitting, and the piezoelectric vibrating piece is sealed inside the vacuum case.

Japanese Patent Laid-Open No. 11-145757

  However, when evacuation is performed with the case opening placed on the metal ring of the plug body, the inner peripheral edge of the case opening and the outer peripheral edge of the metal ring of the plug main body are lined up over the entire circumference. May come into contact. In this case, when the inside of the vacuum chamber is evacuated, a sufficient passage for discharging the air inside the case to the outside of the case cannot be secured. As a result, there is a possibility that the piezoelectric vibrating piece is sealed inside the case while air remains in the case, and the piezoelectric vibrating piece cannot be vacuum sealed. As a result, the electrical characteristics such as the oscillation frequency characteristics and impedance characteristics of the piezoelectric vibrating piece deteriorate, and as a result, the performance of the piezoelectric vibrator deteriorates.

  Accordingly, an object of the present invention is to provide a package capable of reliably performing vacuum sealing and a piezoelectric vibrator using the package.

In order to solve the above-described problems, a package of the present invention accommodates the electronic component, a hermetic terminal including a lead terminal to which an electronic component is connected, a plug body fixed to an intermediate portion of the lead terminal, and the electronic component. A bottomed cylindrical case, wherein the opening of the case is press-fitted and fixed to the outer peripheral surface of the plug body, and an inner peripheral edge of the opening end surface of the case has a shaft of the case A concave portion or a convex portion extending in the direction is formed.
According to the present invention, since the concave portion or the convex portion extending in the axial direction of the case is formed, when the opening portion of the case is placed on the plug body, between the adjacent concave portions or the tip of the convex portion and the plug main body, Abut. A gas passage that communicates the inside and outside of the case is formed between the concave portion itself or the adjacent convex portion. Therefore, when the inside of the case is evacuated, the gas inside the case is released to the outside of the case through the gas passage. be able to. Thereafter, the opening of the case is press-fitted and fixed to the outer peripheral surface of the plug body, and the gas passage is closed, so that the vacuum sealing can be reliably performed.

Further, the recess is formed in the inner peripheral edge of the opening end surface of the case, and the depth of the recess in the axial direction of the case is shorter than the press-fitting length into the plug body in the axial direction of the case. It is characterized by.
According to the present invention, since the depth of the concave portion in the axial direction of the case is shorter than the press-fitting length into the plug body in the axial direction of the case, the case can be formed by simply press-fitting the case into the outer peripheral surface of the plug body. The communicating gas passage is blocked. Thereby, vacuum sealing can be performed easily and reliably.

Further, at least three of the convex portions are formed on the inner peripheral edge of the opening end surface of the case,
The center axis of the case is arranged inside a polygon in which the tips of the plurality of convex portions are connected in a straight line in order along the circumferential direction of the case.
According to the present invention, since the central axis of the case is disposed inside the polygon connecting the plurality of convex portions, the case is supported by the plurality of convex portions when the case is placed on the plug body during press-fitting and fixing. Thus, the case can be prevented from tilting.

The piezoelectric vibrator of the present invention is characterized in that a piezoelectric vibrating piece is accommodated as the electronic component in the package.
According to the present invention, since the piezoelectric vibrating piece is accommodated in the case of the package that is surely vacuum-sealed, it is possible to provide a piezoelectric vibrator capable of obtaining good electrical characteristics.

The oscillator according to the present invention is characterized in that the above-described piezoelectric vibrator is electrically connected to an integrated circuit as an oscillator.
The electronic apparatus according to the present invention is characterized in that the above-described piezoelectric vibrator is electrically connected to a time measuring unit.
The radio-controlled timepiece of the present invention is characterized in that the above-described piezoelectric vibrator is electrically connected to a filter unit.

  According to the oscillator, the electronic device, and the radio timepiece according to the present invention, since the piezoelectric vibrator having good electrical characteristics can be obtained by reliably performing vacuum sealing, the performance of the product can be improved. Can do.

  According to the present invention, since the concave portion or the convex portion extending in the axial direction of the case is formed, when the opening portion of the case is placed on the plug body, between the adjacent concave portions or the tip of the convex portion and the plug main body, Abut. And since the gas passage which connects the inside and outside of the case is formed between the concave portion itself or the adjacent convex portion, the gas inside the case is released to the outside of the case through the gas passage when the inside of the case is evacuated. Can do. Then, vacuum sealing can be performed reliably by press-fitting and fixing the opening of the case to the outer peripheral surface of the plug body to close the gas passage.

It is a front view of the piezoelectric vibrating piece in the embodiment of the present invention. It is a rear view of the piezoelectric vibrating piece in the embodiment of the present invention. It is a front view of a package. It is a perspective view of an airtight terminal. It is explanatory drawing of the case in 1st Embodiment, Fig.5 (a) is side sectional drawing, FIG.5 (b) is a bottom view. It is sectional drawing in the AA of FIG. FIG. 7A is an explanatory diagram of a setting process, FIG. 7B is an explanatory diagram of a evacuation process, and FIG. 7C is an explanatory diagram of a case press-fitting process. FIG. FIG. 8A is a side sectional view of the vicinity of the recess when the case is placed on the plug body, and FIG. 8B is a side sectional view of the vicinity of the recess after press-fitting. . It is explanatory drawing of the case in 2nd Embodiment, Fig.9 (a) is side sectional drawing, FIG.9 (b) is a bottom view. It is explanatory drawing showing the relationship between a some convex part and a central axis. It is a block diagram which shows one Embodiment of the oscillator which concerns on this invention. It is a block diagram which shows one Embodiment of the electronic device which concerns on this invention. It is a block diagram which shows one Embodiment of the radio timepiece which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment, piezoelectric vibrating piece)
First, an embodiment of a piezoelectric vibrating piece in the piezoelectric vibrator of the first embodiment will be described.
FIG. 1 is a front view of a piezoelectric vibrating piece according to an embodiment of the present invention.
FIG. 2 is a rear view of the piezoelectric vibrating piece according to the embodiment of the present invention.
In the piezoelectric vibrator of this embodiment, a piezoelectric vibrating piece 2 is accommodated as an electronic component inside a package.

As shown in FIGS. 1 and 2, the piezoelectric vibrating piece 2 is a tuning fork type vibrating piece formed of a piezoelectric material such as quartz crystal, lithium tantalate or lithium niobate, and when a predetermined voltage is applied. It vibrates.
The piezoelectric vibrating piece 2 includes a pair of vibrating arm portions 10 and 11 arranged in parallel, a base portion 12 that integrally fixes the proximal end sides of the vibrating arm portions 10 and 11, and an outer side of the vibrating arm portions 10 and 11. An excitation electrode 15 formed of a first excitation electrode 13 and a second excitation electrode 14 which is formed on the surface and vibrates the vibrating arm portions 10 and 11, and the first excitation electrode 13 and the second excitation electrode 14 It has the mount electrodes 17 and 18 electrically connected.

In addition, the piezoelectric vibrating piece 2 of the present embodiment includes groove portions 20 formed along the longitudinal direction X of the vibrating arm portions 10 and 11 on both main surfaces of the vibrating arm portions 10 and 11. The groove portion 20 is formed from the proximal end side of the vibrating arm portions 10 and 11 to the vicinity of the middle.
The excitation electrode 15 including the first excitation electrode 13 and the second excitation electrode 14 is an electrode that vibrates the vibrating arm portions 10 and 11 at a predetermined resonance frequency in a direction approaching or separating from each other. 11 are patterned and formed on the outer surface of each of the outer surfaces. Specifically, the first excitation electrode 13 is mainly formed on the groove portion 20 of one vibration arm portion 10 and on both side surfaces of the other vibration arm portion 11, and the second excitation electrode 14 is It is mainly formed on both side surfaces of one vibrating arm portion 10 and on the groove portion 20 of the other vibrating arm portion 11.

  As shown in FIGS. 1 and 2, the first excitation electrode 13 and the second excitation electrode 14 are electrically connected to the mount electrodes 17 and 18 via the extraction electrodes 21 and 22, respectively, on both main surfaces of the base portion 12. Connected. A voltage is applied to the piezoelectric vibrating piece 2 via the mount electrodes 17 and 18.

  The excitation electrode 15, the mount electrodes 17 and 18, and the extraction electrodes 21 and 22 described above are, for example, conductive films (electrode films) such as chromium (Cr), nickel (Ni), aluminum (Al), and titanium (Ti). ).

  Further, a weight metal film 23 for adjusting (frequency adjustment) so as to vibrate its own vibration state within a predetermined frequency range is formed at the tips of the pair of vibrating arm portions 10 and 11. The weight metal film 23 is divided into a coarse adjustment film 23a used when the frequency is roughly adjusted and a fine adjustment film 23b used when the frequency is finely adjusted. By adjusting the frequency using the coarse adjustment film 23a and the fine adjustment film 23b, the frequencies of the vibrating arm portions 10 and 11 can be kept within the range of the nominal frequency of the device.

(Package having a case with a recess)
Next, an embodiment of the package of the present invention will be described. In the following description, in the direction along the center axis C of the case, the open end side of the bottomed cylindrical case is defined as the −Z side, and the closed end side is defined as the + Z side.

FIG. 3 is a front view of the package.
As shown in FIG. 3, the package 1 of the present embodiment includes an airtight structure including lead terminals 45 and 45 to which the electronic component 2 is connected, and a plug body 4 fixed to an intermediate portion of the lead terminals 45 and 45. A package 1 including a terminal 5 and a bottomed cylindrical case 3 that accommodates an electronic component 2, and an opening 31 of the case 3 is press-fitted and fixed to the outer peripheral surface 43 of the plug body 4. A recess 3a extending in the direction of the axis C is formed.

FIG. 4 is a perspective view of the hermetic terminal.
The package of the present embodiment includes an airtight terminal 5, and as shown in FIG. 4, the airtight terminal 5 is an intermediate between the lead terminals 45 and 45 to which electronic components (not shown) are connected and the lead terminals 45 and 45. And a plug body 4 fixed to the portion.

  The lead terminals 45, 45 are columnar members made of metal such as Kovar (FeNiCo alloy), and are arranged in parallel so as to penetrate a plug body 4 described later in a state of being spaced apart by a predetermined distance. The diameter of the lead terminals 45, 45 is, for example, about 0.12 mm. A plating film is formed on the surfaces of the lead terminals 45 and 45. As the plating material, copper (Cu) plating or the like is used for the base film, and high-melting-point solder plating with a melting point of, for example, about 300 ° C. (tin / lead alloy, the weight ratio is 1: 9) is used for the finish film. Used. For example, Cu plating as a base film is formed with a film thickness of about 2 μm to 5 μm. Subsequently, a high melting point solder plating as a finish film is formed with a film thickness of about 8 μm to 15 μm.

  The lead terminals 45, 45 are inner leads 45a, 45a to which electronic components are connected on the + Z side with the plug body 4 interposed therebetween, and outer leads 45b, 45b electrically connected to the outside on the −Z side. It has become.

  As shown in FIG. 4, the plug body 4 includes a metal ring 41 that seals the case, and an insulating material 47 that fills the inside of the metal ring 41 and fixes the plug body 4 to an intermediate portion of the lead terminal 45. Yes.

  The metal ring 41 is formed by forming a metal material such as an iron-nickel alloy into an annular shape, and is formed by pressing or the like. Further, a plating film is formed on the outer peripheral surface of the metal ring 41, and a plating film of the same material as the plating film formed on the lead terminals 45, 45 is formed with substantially the same film thickness. ing.

  The insulating material 47 is made of, for example, borosilicate glass, and the metal ring 41 is fixed to the lead terminals 45 and 45 by filling the inside of the annular metal ring 41. Specifically, the insulating material 47 sintered in a ring shape in advance is set inside the metal ring 41, and the two lead terminals 45, 45 are set at a predetermined interval so as to penetrate the insulating material 47. To do. Then, it puts in a heating furnace and performs baking by the temperature atmosphere of about 1000 degreeC. Thereby, between the insulating material 47 and the lead terminals 45, 45, and between the insulating material 47 and the metal ring 41 are completely sealed, and vacuum sealing can be surely performed.

Returning to FIG. 3, the package 1 of the present embodiment includes a bottomed cylindrical case 3 that accommodates the piezoelectric vibrating piece 2.
The case 3 is formed into a bottomed cylindrical shape by deep drawing a white flat plate member made of an alloy such as copper, nickel, or zinc. As described above, the inner peripheral surface 37 of the case 3 is fixed to the outer peripheral surface 43 of the plug body 4 by press-fitting with the piezoelectric vibrating reed 2 housed inside the case 3. In addition, when forming the length of the case 3 in the direction of the axis C, the inner diameter, or the like to be larger than the limit drawing of the flat plate member, it is desirable to perform deep drawing in a plurality of times in order to prevent cracks.

FIG. 5 is an explanatory view of the case in the first embodiment, FIG. 5 (a) is a side sectional view, and FIG. 5 (b) is a bottom view.
As shown in FIG. 5, the package of this embodiment includes a recess 3 a that extends in the direction of the axis C of the case 3 at the inner peripheral edge 33 of the opening end surface 31 of the case 3.

The recess 3a is molded by a mold at the same time when the case 3 is molded by deep drawing a flat plate member. Specifically, molding is performed by crushing the inner peripheral edge 33 of the opening end face 31 during deep drawing.
The recess 3a is formed by recessing the opening end surface 31 in the + Z direction from the −Z side. The recess 3a may be formed by denting the opening end surface 31 from the inner peripheral surface 37 of the case 3 to the outer peripheral surface 35, or as shown in FIG. 5A, the inner peripheral surface 37 of the opening end surface 31. You may form by denting only the side. Further, at least one recess 3 a is formed in the inner peripheral edge 33 of the opening end surface 31 of the case 3. When the case 3 is placed on the + Z side of the plug body before the case 3 is fixed to the plug body by forming the recess 3a in the inner peripheral edge 33 of the opening end surface 31 of the case 3, the inside and outside of the case 3 A gas passage that communicates with each other is formed.

  Although details will be described in a case press-fitting step in the package manufacturing method described later, the depth of the concave portion 3a from the opening end surface 31 in the axis C direction of the case 3 extends to the plug body 4 in the axis C direction of the case 3. It is formed shorter than the press-fitting length. Thus, vacuum sealing can be performed easily and reliably by simply press-fitting the opening of the case 3 into the outer peripheral surface 43 of the plug body 4.

(Piezoelectric vibrator)
6 is a cross-sectional view taken along line AA in FIG.
As shown in FIG. 6, the piezoelectric vibrating reed 2 is housed inside the package 1 as an electronic component, and the piezoelectric vibrating reed 2 is connected to the tips of the inner leads 45a and 45a, whereby the piezoelectric vibrator 1 is formed. Yes. Specifically, the inner leads 45a and 45a protruding from the plug body 4 to the + Z side and the mount electrodes 17 and 18 of the piezoelectric vibrating piece 2 are mounted via solder E or the like. That is, the inner leads 45a and 45a and the mount electrodes 17 and 18 are mechanically joined via the solder E or the like, and at the same time, the inner leads 45a and 45a and the mount electrodes 17 and 18 are electrically connected. Yes.

  When the piezoelectric vibrator 1 configured as described above is operated, a predetermined drive voltage is applied to the outer leads 45b and 45b of the two lead terminals 45 and 45. Thus, a voltage can be applied to the excitation electrode 15 including the first excitation electrode and the second excitation electrode via the inner leads 45a and 45a, the solder E, the mount electrodes 17 and 18, and the extraction electrodes 21 and 22. The pair of vibrating arm portions 10 and 11 can be vibrated at a predetermined frequency in a direction in which the pair of vibrating arm portions 10 and 11 are approached and separated. The vibration of the pair of vibrating arm portions 10 and 11 can be used as a time source, a control signal timing source, a reference signal source, and the like.

(Package manufacturing method, vacuum sealing process)
Next, a vacuum sealing process in the package manufacturing method of the present embodiment will be described.
7 is an explanatory diagram of the vacuum sealing process, FIG. 7A is an explanatory diagram of the setting process, FIG. 7B is an explanatory diagram of the vacuuming process, and FIG. 7C is a case press-fitting. It is explanatory drawing of a process.
FIG. 8 is an explanatory view of the gas passage, FIG. 8A is a side sectional view of the vicinity of the recess when the case is placed on the plug body, and FIG. 8B is a side view of the vicinity of the recess after press-fitting. It is sectional drawing.
The package vacuum sealing process of the present embodiment includes a setting process S1 in which the plug body 4 is placed on a jig and the case 3 is placed on the plug body 4, a vacuuming process S2 in which vacuuming is performed, and a case 3 A case press-fitting step S3 for press-fitting the plug main body 4. The setting step S1 is performed outside a vacuum chamber (not shown), and the evacuation step S2 and the case press-fitting step S3 are performed in the vacuum chamber.

  The jig used for the vacuum sealing process is composed of an upper jig 60 that supports the case 3, a lower jig 62 that supports the plug body 4, and a press-fitting jig 64 that is pressed to press-fit the case 3. Has been. The upper jig 60 and the lower jig 62 have irregularities (not shown) so that the case 3 can be placed on the + Z side of the plug body 4 while keeping the center axis C of the case 3 along the center axis of the plug body 4. They are positioned in the horizontal direction by fitting or the like. The upper jig 60, the lower jig 62, and the press-fitting jig 64 are formed so that a plurality of packages can be arranged in a lattice shape, and the plurality of packages can be vacuum-sealed at the same time.

  First, as shown in FIG. 7A, a setting step S1 for setting the plug body 4 and the case 3 on a jig is performed. Specifically, first, the plug body 4 is arranged on the lower jig 62 with the outer lead directed to the −Z side. Thereafter, the case 3 is inserted into the insertion hole 60 a of the upper jig 60 with the opening end surface 31 of the case 3 facing −Z. As a result, the opening end face 31 of the case 3 can be placed on the + Z side of the plug body 4 with the center axis C of the case 3 aligned with the center axis of the plug body 4. And between the adjacent recessed parts 3a in the opening end surface 31 of case 3 and the plug main body 4 contact | abut, the gas channel which connects the inside and outside of case 3 to the recessed part 3a itself is formed.

  Next, as shown in FIG. 7B, a vacuuming step S <b> 2 is performed in which vacuuming is performed to remove the gas inside the case 3. As shown in FIGS. 7B and 8A, in a state where the case 3 is placed on the + Z side of the plug body 4, between the adjacent recesses 3a on the opening end surface 31 of the case 3, the plug body 4 and , The recess 3 a itself functions as a gas passage G that communicates the inside and outside of the case 3. Then, by evacuating the vacuum chamber, the gas inside the case 3 can be released to the outside of the case 3 through the gas passage G. In addition, before vacuum-sealing, it is desirable to sufficiently heat each member such as the case and the plug body 4 so that surface adsorbed moisture and the like are desorbed from each member.

  Finally, as shown in FIG. 7C, a case press-fitting step S3 for press-fitting the case 3 into the plug body 4 is performed. Specifically, the press-fitting jig 64 is used to press-fit the opening of the case 3 into the outer peripheral surface 43 of the plug body 4 while applying a predetermined load to the case 3 in the −Z direction. In the setting step S1, since the case 3 is arranged with the central axis C of the case 3 along the central axis of the plug body, the case 3 can be prevented from being press-fitted in a tilted state.

  Here, as shown in FIG. 8B, the depth H of the recess 3 a is set to be shorter than the press-fit length L. As a result, when the case 3 is press-fitted, the gas passage G constituted by the recess 3 a itself is closed, and the inner peripheral surface 37 of the case 3 and the outer peripheral surface 43 of the plug body 4 abut over the entire periphery. As described above, the gas passage G communicating with the inside and outside of the case 3 before press-fitting the case 3 can be closed by simply press-fitting the opening of the case 3 into the outer peripheral surface 43 of the plug body 4. And vacuum sealing can be performed reliably. Since the plating layer made of the base film and the finish film formed on the outer peripheral surface 43 of the plug body 4 has a soft and easy-to-deform characteristic, the outer peripheral surface 43 of the plug body 4 with the plating layer interposed. By press-fitting the opening of the case 3 into the case, it can be surely vacuum-sealed.

  According to this embodiment, as shown in FIG. 8, the recess 3 a extending in the direction of the axis C of the case 3 is formed, so that when the opening of the case 3 is placed on the plug body 4, the adjacent recess Between 3a and the plug main body 4 contact | abut. Since the gas passage G that communicates the inside and outside of the case 3 is formed in the recess 3a itself, when the inside of the case 3 is evacuated, the gas inside the case 3 can be released to the outside of the case 3 through the gas passage G. it can. Thereafter, the opening of the case 3 is press-fitted and fixed to the outer peripheral surface of the plug body 4 to close the gas passage G, whereby the vacuum sealing can be reliably performed.

(Second embodiment, a package having a case in which convex portions are formed)
As a second embodiment, a package in which convex portions are formed on the opening end face of the case will be described with reference to the drawings.
FIG. 9 is an explanatory view of a case in the second embodiment, FIG. 9A is a side sectional view, and FIG. 9B is a bottom view.
Although the recessed part 3a was formed in the opening end surface 31 of the case 3 of 1st Embodiment shown in FIG. 5, the convex part 3b was formed in the opening end surface 31 of the case 3 of 2nd Embodiment shown in FIG. This is different from the first embodiment. Detailed description of the same configuration as in the first embodiment will be omitted.

As shown in FIG. 9, the package of the present embodiment includes a convex portion 3 b that extends in the axis C direction of the case 3 at the inner peripheral edge portion 33 of the opening end surface 31 of the case 3.
The convex portion 3b is molded by a mold at the same time when the case 3 is molded by deep drawing a flat plate member in the same manner as the concave portion described above. Specifically, molding is performed by crushing the inner peripheral edge 33 of the opening end face 31 during deep drawing. Regarding the shape of the convex portion 3b, as long as it is formed extending from the inner peripheral edge 33 of the case 3 to the -Z side of the case 3, the spire shape, rectangular shape, arc shape, etc. as viewed from the radial direction in FIG. Any shape is acceptable.
Further, the length H of the convex portion 3b in the axis C direction of the case 3 (in other words, the depth H of the concave portion formed between the convex portion and the convex portion) is set to the plug body in the axis C direction of the case 3. It is formed shorter than the press-fitting length. Thereby, similarly to 1st Embodiment, vacuum sealing can be performed easily and reliably only by press-fitting the opening part of case 3 in the outer peripheral surface of a plug main body.

FIG. 10 is an explanatory diagram showing the relationship between the plurality of convex portions and the central axis.
In the package of the present embodiment, as shown in FIG. 10, at least three convex portions 3 b are formed on the inner peripheral edge portion 33 of the opening end surface 31 of the case 3, and the central axis C of the case 3 has a plurality of convex portions. The tip of the part 3 b is arranged inside a polygon T that is connected in a straight line in order along the circumferential direction of the case 3. Thereby, the moment by the dead weight of case 3 balances with the front-end | tip of each convex part 3b as a fulcrum. For this reason, the case 3 can be stably supported by the plurality of convex portions 3b without tilting. Thereby, since the center axis C of the case 3 can be placed along the center axis of the plug body, the case 3 is not press-fitted and fixed to the outer peripheral surface of the plug body with the case 3 tilted. Therefore, it is possible to smoothly press-fit the plug body without causing galling on the press-fitting surfaces of the case 3 and the plug body.

(Package manufacturing method, vacuum sealing process)
Next, the vacuum sealing process in the manufacturing method of the package of 2nd Embodiment is demonstrated.
In the vacuum sealing process in the manufacturing method of the package of the first embodiment, the gas passage is formed in the recess itself. However, in the vacuum sealing process in the manufacturing method of the package of the second embodiment, a gas is formed between the protrusions. This is different from the first embodiment in that a passage is formed. In addition, detailed description is abbreviate | omitted about the part of the structure similar to the vacuum sealing process in the manufacturing method of the package of 1st Embodiment.

In the evacuation process of the vacuum sealing process of the present embodiment, the protrusion 3b on the opening end surface 31 of the case 3 and the plug body shown in FIG. Is formed. Then, by evacuating the case 3 with the case 3 placed on the + Z side of the plug body, the gas inside the case 3 can be released to the outside of the case 3 through the gas passage G.
Further, in the case press-fitting step of the vacuum sealing step of the present embodiment, as described above, the length H of the convex portion 3b is set lower than the press-fitting length. As a result, when the case 3 is press-fitted, the gas passage G formed between the convex portions 3b is closed, and the inner peripheral surface of the case 3 and the outer peripheral surface of the plug body may come into contact over the entire periphery. it can.

  According to the present embodiment, as shown in FIG. 9A, the convex portion 3b extending in the direction of the axis C of the case 3 is formed. Therefore, when the opening of the case 3 is placed on the plug body, The tip of the protrusion 3b comes into contact with the plug body. And since the gas passage G which connects the inside and outside of the case 3 is formed between the adjacent convex parts 3b, when the inside of the case 3 is evacuated, the gas inside the case 3 is brought out of the case 3 through the gas passage G. Can be released. Thereafter, the opening of the case 3 is press-fitted and fixed to the outer peripheral surface of the plug main body to close the gas passage, whereby the vacuum sealing can be reliably performed. Further, as shown in FIG. 10, the central axis C of the case 3 is arranged inside a polygon T in which the tips of the convex portions 3b adjacent to the circumferential direction of the case 3 are connected in a straight line in order, When the case 3 is placed on the plug body, the case 3 can be supported by the plurality of convex portions 3b and the case 3 can be prevented from tilting.

(Oscillator)
Next, an embodiment of an oscillator according to the present invention will be described with reference to FIG.
As shown in FIG. 11, the oscillator 110 according to the present embodiment is configured by configuring a package (piezoelectric vibrator) 1 as an oscillator electrically connected to an integrated circuit 111. The oscillator 110 includes a substrate 113 on which an electronic element component 112 such as a capacitor is mounted. An integrated circuit 111 for an oscillator is mounted on the substrate 113, and the piezoelectric vibrating piece 2 of the piezoelectric vibrator 1 is mounted in the vicinity of the integrated circuit 111. The electronic element component 112, the integrated circuit 111, and the piezoelectric vibrator 1 are electrically connected by a wiring pattern (not shown). Each component is molded with a resin (not shown).

In the oscillator 110 configured as described above, when a voltage is applied to the piezoelectric vibrator 1, the piezoelectric vibrating piece 2 in the piezoelectric vibrator 1 vibrates. This vibration is converted into an electric signal by the piezoelectric characteristics of the piezoelectric vibrating piece 2 and input to the integrated circuit 111 as an electric signal. The input electrical signal is subjected to various processes by the integrated circuit 111 and output as a frequency signal. Thereby, the piezoelectric vibrator 1 functions as an oscillator.
In addition, by selectively setting the configuration of the integrated circuit 111, for example, an RTC (real-time clock) module or the like as required, the operation date and time of the device or external device in addition to a single-function oscillator for a clock, etc. A function for controlling the time, providing a time, a calendar, and the like can be added.

  According to the oscillator 110 of the present embodiment as described above, since the piezoelectric vibrator capable of obtaining good electrical characteristics by reliably performing vacuum sealing is provided, a high-performance oscillator can be provided. .

(Electronics)
Next, an embodiment of an electronic apparatus according to the present invention will be described with reference to FIG. Note that a portable information device 120 having the above-described piezoelectric vibrator 1 will be described as an example of the electronic device.
First, the portable information device 120 of this embodiment is represented by, for example, a mobile phone, and is a development and improvement of a wrist watch in the prior art. The appearance is similar to that of a wristwatch, and a liquid crystal display is arranged in a portion corresponding to a dial so that the current time and the like can be displayed on this screen. Further, when used as a communication device, it is possible to perform communication similar to that of a conventional mobile phone by using a speaker and a microphone that are removed from the wrist and incorporated in the inner portion of the band. However, it is much smaller and lighter than conventional mobile phones.

  Next, the configuration of the portable information device 120 of this embodiment will be described. As shown in FIG. 12, the portable information device 120 includes the piezoelectric vibrator 1 and a power supply unit 121 for supplying power. The power supply unit 121 is made of, for example, a lithium secondary battery. The power supply unit 121 includes a control unit 122 that performs various controls, a clock unit 123 that counts time, a communication unit 124 that communicates with the outside, a display unit 125 that displays various information, and the like. A voltage detection unit 126 that detects the voltage of the functional unit is connected in parallel. Power is supplied to each functional unit by the power supply unit 121.

  The control unit 122 controls each function unit to control operation of the entire system such as transmission and reception of audio data, measurement and display of the current time, and the like. The control unit 122 includes a ROM in which a program is written in advance, a CPU that reads and executes the program written in the ROM, and a RAM that is used as a work area for the CPU.

  The timer unit 123 includes an integrated circuit including an oscillation circuit, a register circuit, a counter circuit, an interface circuit, and the like, and the piezoelectric vibrator 1. When a voltage is applied to the piezoelectric vibrator 1, the piezoelectric vibrating piece 2 vibrates, and the vibration is converted into an electric signal by the piezoelectric characteristics of the crystal and input to the oscillation circuit as an electric signal. The output of the oscillation circuit is binarized and counted by a register circuit and a counter circuit. Then, signals are transmitted to and received from the control unit 122 through the interface circuit, and the current time, current date, calendar information, and the like are displayed on the display unit 125.

The communication unit 124 has functions similar to those of a conventional mobile phone, and includes a radio unit 127, a voice processing unit 128, a switching unit 129, an amplification unit 130, a voice input / output unit 131, a telephone number input unit 132, a ring tone generation unit. 133 and a call control memory unit 134.
The radio unit 127 exchanges various data such as audio data with the base station via the antenna 135. The audio processing unit 128 encodes and decodes the audio signal input from the radio unit 127 or the amplification unit 130. The amplifying unit 130 amplifies the signal input from the audio processing unit 128 or the audio input / output unit 131 to a predetermined level. The voice input / output unit 131 includes a speaker, a microphone, and the like, and amplifies a ringtone and a received voice or collects a voice.

In addition, the ring tone generator 133 generates a ring tone in response to a call from the base station. The switching unit 129 switches the amplifying unit 130 connected to the voice processing unit 128 to the ringing tone generating unit 133 only when an incoming call is received, so that the ringing tone generated by the ringing tone generating unit 133 passes through the amplifying unit 130. To the audio input / output unit 131.
Note that the call control memory unit 134 stores a program related to incoming / outgoing call control of communication. The telephone number input unit 132 includes, for example, number keys from 0 to 9 and other keys. By pressing these number keys and the like, a telephone number of a call destination is input.

  The voltage detection unit 126 detects the voltage drop and notifies the control unit 122 when the voltage applied to each functional unit such as the control unit 122 by the power supply unit 121 falls below a predetermined value. . The predetermined voltage value at this time is a value set in advance as a minimum voltage necessary to stably operate the communication unit 124, and is, for example, about 3V. Upon receiving the voltage drop notification from the voltage detection unit 126, the control unit 122 prohibits the operations of the radio unit 127, the voice processing unit 128, the switching unit 129, and the ring tone generation unit 133. In particular, it is essential to stop the operation of the wireless unit 127 with high power consumption. Further, the display unit 125 displays that the communication unit 124 has become unusable due to insufficient battery power.

That is, the operation of the communication unit 124 can be prohibited by the voltage detection unit 126 and the control unit 122, and that effect can be displayed on the display unit 125. This display may be a text message, but as a more intuitive display, a x (X) mark may be attached to the telephone icon displayed at the top of the display surface of the display unit 125.
In addition, the function of the communication part 124 can be stopped more reliably by providing the power supply cutoff part 136 that can selectively cut off the power of the part related to the function of the communication part 124.

  According to the portable information device 120 of this embodiment, as described above, since the piezoelectric vibrator capable of obtaining good electrical characteristics by reliably performing vacuum sealing is provided, a high-performance portable information device. Can be provided.

(Radio watch)
Next, an embodiment of a radio timepiece according to the present invention will be described with reference to FIG.
As shown in FIG. 13, the radio-controlled timepiece 140 according to the present embodiment includes the piezoelectric vibrator 1 electrically connected to the filter unit 141. The radio-controlled timepiece 140 receives a standard radio wave including timepiece information and is accurate. It is a clock with a function of automatically correcting and displaying the correct time.
In Japan, there are transmitting stations (transmitting stations) that transmit standard radio waves in Fukushima Prefecture (40 kHz) and Saga Prefecture (60 kHz), each transmitting standard radio waves. Long waves such as 40 kHz or 60 kHz have both the property of propagating the ground surface and the property of propagating while reflecting the ionosphere and the ground surface, so the propagation range is wide, and the above two transmitting stations cover all of Japan. is doing.

Hereinafter, the functional configuration of the radio timepiece 140 will be described in detail.
The antenna 142 receives a long standard wave of 40 kHz or 60 kHz. The long-wave standard radio wave is obtained by subjecting time information called a time code to AM modulation on a 40 kHz or 60 kHz carrier wave. The received long standard wave is amplified by the amplifier 143 and filtered and tuned by the filter unit 141 having the plurality of piezoelectric vibrators 1.
The piezoelectric vibrator 1 according to this embodiment includes crystal vibrator portions 148 and 149 having resonance frequencies of 40 kHz and 60 kHz that are the same as the carrier frequency.

Further, the filtered signal having a predetermined frequency is detected and demodulated by the detection and rectification circuit 144.
Subsequently, the time code is taken out via the waveform shaping circuit 145 and counted by the CPU 146. The CPU 146 reads information such as the current year, accumulated date, day of the week, and time. The read information is reflected in the RTC 148, and accurate time information is displayed.
Since the carrier wave is 40 kHz or 60 kHz, the crystal vibrator portions 148 and 149 are preferably vibrators having the tuning fork type structure described above.

  In addition, although the above-mentioned description was shown in the example in Japan, the frequency of the long standard wave is different overseas. For example, in Germany, a standard radio wave of 77.5 KHz is used. Therefore, when the radio timepiece 140 that can be used overseas is incorporated in a portable device, the piezoelectric vibrator 1 having a frequency different from that in Japan is required.

  According to the radio-controlled timepiece 140 of the present embodiment, as described above, the high-performance radio-controlled timepiece is provided because it includes the piezoelectric vibrator that can obtain good electrical characteristics by reliably performing vacuum sealing. can do.

The present invention is not limited to the embodiment described above.
In the package of the first embodiment, a concave portion is formed on the inner peripheral edge portion of the opening end surface of the case, and in the package of the second embodiment, a convex portion is formed on the inner peripheral edge portion of the opening end surface of the case. A gas passage that communicates the inside and outside of the case is formed between the recesses themselves or adjacent protrusions. However, for example, a through hole that communicates the inside and outside of the case may be formed at a position shorter than the press-fitting length from the opening end surface of the case peripheral surface. As a result, a gas passage communicating between the inside and the outside of the case is formed, and the gas inside the case can be discharged to the outside of the case, so that vacuum sealing can be performed easily and reliably. However, the concave portion or the convex portion in the first or second embodiment can be molded by a mold at the same time when the cylindrical portion is molded, whereas when the through hole is formed, it is necessary to form the through hole by post-processing. . Further, since the diameter of the case is about several mm, it is difficult to process as compared with the present embodiment. Therefore, the present embodiment is superior in terms of processing time and ease of processing.

DESCRIPTION OF SYMBOLS 1 ... Package (piezoelectric vibrator) 2 ... Electronic component (piezoelectric vibrating piece) 3 ... Case 3a ... Concave part 3b ... Convex part 4 ... Plug body 5 ... Airtight terminal 31 ... Open end face of case 33 ... Inner peripheral edge 43 ... Outer peripheral face of plug body 45 ... Lead terminal 110 ... Oscillator 120 ... Portable information device (electronic device) 140 ... Radio wave Timepiece C ... Case axis (Case central axis) H ... Depression depth (convex length) L ... Press-fit length T ... Polygon

Claims (7)

An airtight terminal comprising: a lead terminal to which an electronic component is connected; and a plug body fixed to an intermediate portion of the lead terminal;
A bottomed cylindrical case that houses the electronic component;
With
A package in which the opening of the case is press-fitted and fixed to the outer peripheral surface of the plug body,
A package characterized in that a concave or convex portion extending in the axial direction of the case is formed on an inner peripheral edge of the opening end surface of the case. The recess is formed in the inner peripheral edge of the opening end surface of the case,
The package according to claim 1, wherein a depth of the concave portion in the axial direction of the case is shorter than a press-fitting length into the plug body in the axial direction of the case. At least three projections are formed on the inner peripheral edge of the opening end surface of the case,
2. The package according to claim 1, wherein the central axis of the case is arranged inside a polygon in which tips of the plurality of convex portions are connected in a straight line in order along the circumferential direction of the case.   A piezoelectric vibrator, wherein a piezoelectric vibrating piece is accommodated as the electronic component in the package according to any one of claims 1 to 3.   An oscillator, wherein the piezoelectric vibrator according to claim 4 is electrically connected to an integrated circuit as an oscillator.   5. An electronic apparatus, wherein the piezoelectric vibrator according to claim 4 is electrically connected to a time measuring unit.   A radio-controlled timepiece wherein the piezoelectric vibrator according to claim 4 is electrically connected to a filter portion.

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