JP4878281B2 - Press-fitting device and method for manufacturing piezoelectric vibrator - Google Patents

Description

  The present invention relates to a press-fitting device for press-fitting a plug into a case in a cylinder package type piezoelectric vibrator, a method for manufacturing the piezoelectric vibrator, an oscillator including the piezoelectric vibrator, an electronic device, and a radio timepiece. Is.

  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. Various types of piezoelectric vibrators of this type are provided, and as one of them, a cylinder package type piezoelectric vibrator formed in a substantially cylindrical shape is known.

  The basic structure of a cylinder package type piezoelectric vibrator is as follows: a piezoelectric vibrating piece, a case with a bottomed cylindrical shape having an opening and covering the outer periphery of the piezoelectric vibrating piece, and a plug that hermetically seals the opening of the case It consists of. The plug is composed of a substantially cylindrical stem, a lead inserted into the stem, and a filler that is hermetically filled between the stem and the lead. Since the piezoelectric vibrating piece is connected to the lead portion, electrical connection between the outside and the piezoelectric vibrating piece is enabled via the lead.

Such a piezoelectric vibrator is manufactured by the following procedure. First, a stem, a lead, and a filler as a plug are assembled. Then, a piezoelectric vibrating piece is mounted on the inner lead portion of the plug leads. Next, the plug with the piezoelectric vibrating piece connected thereto is arranged in the press-fitting device and press-fitted into the case. More specifically, the plug is disposed coaxially with the case, and in this state, the plug is inserted into the case from the piezoelectric vibrating piece. The stem is press-fitted into the case by applying a load to the pair of clamp plates that are in contact with the end surface opposite to the inner lead portion of the stem with a hydraulic device, and a piezoelectric vibrator in which the inside of the case is hermetically sealed is completed. (For example, refer to Patent Document 1).
JP-A-8-316761

  However, in the manufacturing method and the press-fitting device according to Patent Document 1, when a pair of clamp plates has a step, when a slight burr or the like is attached to the clamp plates, or between the stem and the case. When an eccentric force is applied for some reason, the stem is pressed into the case obliquely. FIG. 21 shows an example in which the stem 153 is obliquely press-fitted with respect to the case 152 due to a difference in level between the pair of clamp plates 150 and 151. That is, as shown in FIG. 21, the stem 153 is obliquely press-fitted by a step so that the airtightness inside the case 152 cannot be secured, thereby making the frequency of the vibrating piece unstable. turn into. Even if the airtightness can be secured, the piezoelectric vibrating piece 154 is also disposed obliquely with respect to the case 152 because the stem 153 is press-fitted obliquely. For this reason, the tip 154a of the piezoelectric vibrating piece 154 comes into contact with the inner peripheral surface of the case in a state of vibration or at rest, and the frequency of the piezoelectric vibrating piece 154 becomes unstable. In particular, in recent years, a reduction in the size of the piezoelectric vibrator has been demanded, and the separation between the case 152 and the piezoelectric vibrating piece 154 has also been reduced. As a result, frequency instability caused by the press-fitting of the stem 153 obliquely becomes prominent. Yield is decreasing.

  The present invention has been made in view of the above-described circumstances, and is a piezoelectric vibrator press-fitting device capable of accurately press-fitting a plug having a piezoelectric vibrating piece connected to a case on the same axis, and piezoelectric vibration. A child manufacturing method, an oscillator including a piezoelectric vibrator, an electronic device, and a radio timepiece are provided.

In order to solve the above problems, the present invention proposes the following means.
The press-fitting device according to the present invention includes a stem having a substantially cylindrical shape and hermetically sealed inside, a lead having a lead inserted through the stem, and an inner lead portion of the lead protruding from one end surface of the stem of the plug A piezoelectric vibrating piece connected to the tube, and a bottomed substantially cylindrical shape having an opening, and the opening is hermetically sealed by the plug with the piezoelectric vibrating piece disposed therein. A press-fitting device for press-fitting the stem of the plug into the opening of the case in a manufacturing process of the vibrator, wherein the inner lead portion is brought into contact with the other end surface opposite to the one end surface of the stem. A plug alignment plate that supports the plug in a state in which the piezoelectric vibrating piece connected to the projection protrudes, and is arranged with a gap from the plug alignment plate, and is approximately equal to the outer diameter of the stem of the plug. And a stem guide plate having a stem insertion hole formed in an inner diameter capable of inserting and removing the stem in a supported state, and abuttingly arranged with the stem guide plate and coaxial with the central axis of the stem insertion hole Above, a case guide plate having a case receiving hole formed so as to be able to receive the piezoelectric vibrating piece and the case, which are substantially equal to the outer diameter of the case and connected to the plug in a supported state, A case guide plate, the case accommodated in the case accommodation hole of the case guide plate, and the stem guide plate toward the plug alignment plate along a central axis of the stem insertion hole and the case accommodation hole And press-fitting means for moving.

  Further, the present invention provides a plug having a substantially cylindrical shape hermetically sealed inside and a lead inserted through the stem, and an inner lead portion of the lead protruding from one end surface of the stem of the plug. A connected piezoelectric vibrating piece, and a bottomed, generally cylindrical shape having an opening, and a case in which the plug is press-fitted into the opening and hermetically sealed with the piezoelectric vibrating piece disposed therein. A method of manufacturing a piezoelectric vibrator, wherein the piezoelectric vibrating piece connected to the inner lead portion is protruded by bringing a plug alignment plate into contact with the other end surface opposite to the one end surface of the stem. A plug alignment step for supporting the plug, and inserting the stem of the plug in a supported state into a stem insertion hole formed in the stem guide plate with an inner diameter substantially equal to the outer diameter of the stem. And a stem fixing step in which the stem is fitted and fixed in a state in which the stem guide plate can be inserted and removed in the direction of the central axis of the stem insertion hole, and the case guide plate is formed with an inner diameter substantially equal to the outer diameter of the case. A case preparing step of inserting the case into the case receiving hole so that the case can move integrally with the case guide plate; and the case receiving hole coaxially with the central axis of the stem insertion hole. The case guide plate is moved toward the plug alignment plate along the center axis of the case receiving hole and the stem insertion hole in a state where the case guide plate is disposed in contact with the stem guide plate. A press-fitting step of press-fitting the stem into the opening of the case housed in the case housing hole. It is characterized in Rukoto.

  According to the press-fitting device and the method of manufacturing a piezoelectric vibrator according to the present invention, the plug is connected to the inner lead portion by the plug alignment plate by the plug alignment plate coming into contact with the other end surface of the stem as the plug alignment process. The piezoelectric vibrating piece is supported in a protruding state. Next, as a stem fixing step, the stem guide plate is disposed in a state where the stem is inserted into the stem insertion hole while being spaced from the plug alignment plate. Here, the stem insertion hole is formed to have an inner diameter that is substantially equal to the outer diameter of the stem and that allows the stem in a supported state to be inserted and removed. For this reason, the stem is supported by the plug alignment plate and is externally fitted and fixed by the stem guide plate so that it can be inserted and removed in the central axis direction. On the other hand, as a case preparation step, the case can be moved integrally with the case guide plate by inserting the case into the case receiving hole of the case guide plate. Here, since the case receiving hole is set to have an inner diameter substantially equal to the outer diameter of the case, the case is received in the case receiving hole so as to be coaxial with the central axis of the case receiving hole.

  Next, as a press-fitting process, first, the case guide plate is placed in contact with the stem guide plate so that the case accommodation hole is coaxial with the central axis of the stem insertion hole. For this reason, the case accommodated in the case accommodation hole is arranged coaxially with the stem inserted into the stem insertion hole in a state where the piezoelectric vibrating piece is inserted therein. When the case guide plate is moved toward the plug alignment plate along the center axis of the stem insertion hole and the case receiving hole by the press-fitting means, the case moves toward the stem together with the case guide plate. At this time, the stem guide plate is disposed at a distance from the plug alignment plate, and the stem is inserted into the stem insertion hole in a detachable manner. That is, the stem guide plate moves following the case guide plate and keeps the stem fitted and fixed so as not to be eccentric with respect to the case. For this reason, the stem is pressed into the opening of the case by the reaction force from the plug alignment plate while being kept coaxial with the case.

  Further, in the above press-fitting device, the plug alignment plate includes a main body portion, a support portion that is located on the inner side of the outer periphery of the stem of the plug, protrudes from the main body portion, and contacts the other end surface of the stem. It is said that it is more preferable to have.

  According to the press-fitting device according to the present invention, the stem is supported by the support portion of the plug alignment plate so as to be separated from the main body portion at a position inside the outer periphery of the stem. For this reason, by increasing the thickness of the stem guide plate, it is possible to externally fix the stem in a wider range in the direction of the center axis of the stem at the start of press-fitting by the press-fitting means, and more reliably keep the stem coaxial with the case. On the other hand, the stem guide plate can be retracted to the main body side with the press-fitting.

Furthermore, in the above press-fitting device, it is more preferable that the thickness of the stem guide plate is set to be substantially equal to or larger than the length of the stem in the central axis direction.
According to the press-fitting device according to the present invention, the stem can be externally fitted and fixed by the stem guide plate in the entire central axis direction, and the stem can be more securely kept coaxial with the case when press-fitting by the press-fitting means.

  Further, in the press-fitting device, a plurality of substantially plate-like pallet main bodies and a plurality of pallet main bodies are provided along one side of the pallet main body, from the pallet main body to the stem, the inner lead portion of the lead, and the inner lead portion. A plug pallet having a fixing portion capable of fixing an outer lead portion protruding from the other end face of the stem of the lead to the pallet body in a state where the connected piezoelectric vibrating piece is protruded; More preferably, the plug alignment plate has an accommodating portion for accommodating the plug pallet in a state where the stems of the plurality of plugs fixed to the plug pallet are in contact with and supported.

  In the method for manufacturing a piezoelectric vibrator, the inner lead portion of the stem and the lead is protruded by fixing the outer lead portion protruding from the other end surface of the stem of the lead. A plug preparing step of fixing a plurality of the plugs to a substantially plate-shaped plug pallet, and a vibrating piece bonding step of bonding the piezoelectric vibrating piece to the inner lead portion of each plug fixed to the plug pallet, More preferably, the plug aligning step abuts and supports the stem of each plug fixed to the plug pallet in a state where the piezoelectric vibrating reed is connected by the plug preparing step and the vibrating piece joining step. Has been.

  According to the press-fitting device and the piezoelectric vibrator manufacturing method according to the present invention, the plurality of plugs protrude the piezoelectric vibrating piece connected to the stem and the inner lead portion from the plug pallet main body through the plug preparation process and the vibrating piece joining process. In this state, each is fixed to the plug pallet body by the fixing portion. For this reason, in the plug aligning step, the plug pallet is accommodated in the accommodating portion of the plug aligning plate, so that a plurality of plugs can be supported by the plug aligning plate at the same time, and the plural plugs are handled integrally. Can be efficient.

  Further, in the above press-fitting device, the fixing portion of the plug pallet includes an urging unit capable of holding the outer lead portion of the plug by an urging force and releasing the pinched state by pressing. It is more preferable that the accommodating portion of the plug alignment plate is provided with a pressing member that presses the urging means in a state where the plug pallet is accommodated.

  The piezoelectric vibrator manufacturing method may further include a plug pallet detachment step of removing the plug pallet from the outer lead portion of the plug after the plug alignment step, and the press-fitting step is performed after the plug pallet detachment step. Is more preferable.

  According to the press-fitting device and the piezoelectric vibrator manufacturing method according to the present invention, in the plug alignment step, the plug pallet is accommodated in the accommodating portion of the plug alignment plate so that the urging means of the fixing portion of the plug pallet is the pressing member. The state where the outer lead portion of the plug is clamped is released. Thereby, the plug pallet can be removed from the plug that is supported by the plug alignment plate in the plug pallet detaching step, and the plug stem can be press-fitted into the case without the plug pallet in the press-fitting step. For this reason, in the press-fitting process, the inside of the case can be hermetically sealed in a vacuum state without being affected by degassing from the plug pallet.

The oscillator according to the present invention is characterized in that the piezoelectric vibrator is connected to an integrated circuit as an oscillator.
Moreover, an electronic apparatus according to the present invention includes the above-described piezoelectric vibrator.
The radio timepiece of the present invention is characterized in that the piezoelectric vibrator is electrically connected to a filter portion.

  According to the oscillator, the electronic device, and the radio-controlled timepiece according to the present invention, the piezoelectric vibrator that can be produced with high yield and low cost and can stably vibrate the piezoelectric vibrating piece at a predetermined frequency is provided. . For this reason, it is possible to provide a low-cost and highly reliable oscillator, electronic device, and radio timepiece.

According to the press-fitting device of the present invention, since the stem guide plate, the case guide plate, and the press-fitting means are provided, the plug can be accurately press-fitted coaxially with respect to the case. For this reason, it is possible to manufacture a highly reliable piezoelectric vibrator that can stably vibrate the piezoelectric vibrating piece at a predetermined frequency, and therefore, it is possible to manufacture with high yield and low cost.
According to the method for manufacturing a piezoelectric vibrator of the present invention, since the stem fixing step, the case preparation step, and the press-fitting step are provided, the plug can be accurately press-fitted coaxially with respect to the case. For this reason, it is possible to manufacture a highly reliable piezoelectric vibrator that can stably vibrate the piezoelectric vibrating piece at a predetermined frequency, and therefore, it is possible to manufacture with high yield and low cost.
In addition, according to the oscillator, the electronic device, and the radio timepiece of the present invention, it is possible to reduce the cost and improve the reliability by including the piezoelectric vibrator described above.

(First embodiment)
1 to 17 show a first embodiment according to the present invention. FIG. 1 shows an overall view of the press-fitting device of this embodiment. 2 and 3 show an example of a piezoelectric vibrator manufactured by the press-fitting device of this embodiment.

  As shown in FIGS. 2 and 3, the piezoelectric vibrator 51 manufactured by the press-fitting device 1 of the present embodiment is a cylinder package type piezoelectric vibrator, and includes the piezoelectric vibrating piece 52 and the piezoelectric vibrating piece 52 inside. A bottomed substantially cylindrical case 53 that covers the outer periphery of the case 53 and a plug 54 that hermetically seals the opening 53a of the case 53 are provided. In the case of this embodiment, the piezoelectric vibrating piece 52 is a tuning fork type vibrating piece, and is a substantially plate-like crystal piece 52a having a pair of vibrating arm portions 55 and 56 arranged in parallel with each other in an adjacent state. Is formed. Further, excitation electrodes each having a conductive film formed in a predetermined pattern are provided on both surfaces of the crystal piece 52a. The excitation electrodes on both sides are patterned by being electrically separated from each other. Then, by applying a voltage to the excitation electrode, the vibrating arm portions 55 and 56 can be vibrated at a predetermined resonance frequency in a direction approaching or separating from each other.

  The plug 54 is filled between the stem 57 and the lead 58 inside the stem 57, the substantially cylindrical stem 57 press-fitted into the opening 53a of the case 53, the two leads 58 inserted through the stem 57, and the inside of the stem 57. And a filler 59 that is hermetically sealed. The filler 59 is made of an insulating material, for example, borosilicate glass. Further, the stem 57 is set to have an outer diameter slightly larger than the inner diameter of the case 53. The stem 57 is press-fitted into the opening 53 a of the case 53, so that the inside of the case 53 is hermetically sealed by the stem 57 and the filler 59. The lead 58 includes an inner lead portion 58a that protrudes from the one end face 57a of the stem 57 to the inside of the case 53, and an outer lead that protrudes from the other end face 57b opposite to the one end face 57a of the stem 57 to the outside of the case 53. Lead portion 58b. The excitation electrode of the piezoelectric vibrating piece 52 is joined to the inner lead portion 58 a of the lead 58, so that it can be electrically connected to the excitation electrode of the piezoelectric vibrating piece 52 from the outside via the lead 58. is there. The lead 58 is disposed substantially parallel to the central axis L53 of the case 53 as a whole, and only the inner lead portion 58a is slightly bent, and the piezoelectric vibration joined to the inner lead portion 58a. The tip 52b of the piece 52 is set so as to be positioned on the central axis L53 of the case 53.

  Next, the press-fitting device 1 will be described. The press-fitting device 1 is a device that press-fits the plug 54 in which the piezoelectric vibrating piece 52 is connected to the inner lead portion 58 a into the opening 53 a of the case 53 in the piezoelectric vibrator 51. As shown in FIG. 1, the press-fitting device 1 includes a plurality of press-fitting dies 2 loaded with a plug 54 to which a piezoelectric vibrating piece 52 is connected and a corresponding case 53, and a plurality of heater blocks 3 that heat the press-fitting dies 2. The airtight chamber 4 for accommodating the press-fit molds 2 and the heater blocks 3 alternately stacked on the mounting surface 4a and the press-fitting means 5 for pressurizing the press-fit mold 2 are provided. The heater block 3 can be heated by a plurality of embedded sheathed heaters 3a, whereby each press-fitting die 2 interposed between the heater blocks 3 can be heated to a predetermined temperature. The airtight chamber 4 can be evacuated to a vacuum state by an evacuation unit (not shown). A pair of through holes are formed in the heater block 3 at a position on the side of the interposed press-fit mold 2, and a shaft 6 erected from the placement surface 4 a is inserted through the heater block 3. Further, a spring 6a that is externally mounted on the shaft 6 is interposed between the heater blocks 3 so as to maintain an interval at which the press-fit mold 2 can be inserted and removed. A stopper 7 is fixed to the upper end portion of the shaft 6, and the press-fit mold 2 and the heater block 3 are sandwiched between the stopper 7 and the mounting surface 4 a. The press-fitting device 1 includes a hydraulic cylinder 8 that pushes up the lowermost heater block 3 b of the heater block 3 and a hydraulic unit 9 that controls the hydraulic cylinder 8. Then, under the control of the hydraulic unit 9, the heater block 3b is pushed up by the hydraulic cylinder 8, so that the heater block 3 and the press-fit mold 2 are sandwiched between the hydraulic cylinder 9 and the stopper 7, thereby press-fitting type. 2, that is, the stopper 7, the hydraulic cylinder 8, and the hydraulic unit 9 constitute the press-fitting means 5 that pressurizes the press-fitting die 2 and press-fits the plug 54 into the case 53.

  Next, the press-fit mold 2 will be described. As shown in FIG. 4, each press-fit mold 2 includes a base plate 11, a plurality of plug alignment plates 12, a stem guide plate 13, a case guide plate 14, and an upper plate 15 in order from the bottom to the top. Is provided. Below, the detail of each structure of the press-fit type | mold 2 is demonstrated.

  As shown in FIG. 4, in the press-fit mold 2, a plurality of plug alignment plates 12 are arranged in a row on a substantially plate-like base plate 11. Here, each plug alignment plate 12 is constituted by two separators 16 and 16 arranged adjacent to each other. As shown in FIGS. 5 to 7, the separator 16 includes a substantially plate-like separator main body 17, and a first top plate 18 and a second top plate 19 that protrude from the upper edge portion 17 a of the separator main body 17 on both sides, respectively. And a first flange 20 and a second flange 21 respectively protruding from both side edge portions 17b of the separator body 17 to both sides. The width of the first top plate 18 and the first flange 20 protruding from the separator body 17 is smaller than the width of the second top plate 19 and the second flange 21 protruding from the separator body 17, which will be described later. The pallet body 31 is formed so as to be substantially equal to the thickness of the pallet body 31. Also, a plurality of semicircular grooves 18b and 19b are arranged at equal intervals on the edge portions 18a and 19a of the first top plate 18 and the second top plate 19 facing each other so as to face each other. And it is formed to penetrate in the thickness direction. Further, on the top surfaces of the first top plate 18 and the second top plate 19, substantially semicircular projections 22 and 23 are formed at positions corresponding to the grooves 18b and 19b, respectively. Corresponding grooves 18b and 19b are formed in the projecting portions 22 and 23 in communication. Further, the outer diameters of the protrusions 22 and 23 are set smaller than the outer diameter of the stem 57. In the present embodiment, in each separator 16, the protruding portions 22 and 23 and the corresponding grooves 18b and 19b are provided at 22 locations. A pair of substantially rectangular grooves 18c and 19c are formed on both sides of the plurality of grooves 18b and 19b at the edge portions 18a and 19a of the first top board 18 and the second top board 19, respectively. Has been. Further, a plurality of pairs of pressing members 24, 24 are provided on the side surface 17c of the separator body 17 on the first top plate 18 side so as to protrude in a position corresponding to the groove 18b. The pressing member 24 releases the fixed state of the fixing portion 32 of the plug pallet 30 described later, and details thereof will be described later.

  As shown in FIG. 4, these separators 16 are arranged in close contact with each other on the base plate 11 as described above, and the pressing block 25 and the stopper 26 arranged to face each other in the arrangement direction, and The pair of side surface blocks 27 and 27 arranged to face each other in a direction orthogonal to the arrangement direction are sandwiched and integrated. In the present embodiment, 27 separators 16 are arranged. The pressing block 25 includes a pressing attachment plate 28 having a substantially U-shaped cross section in which a groove 28 a is formed at a position facing the separator 16, and a pressing plate 29 inserted into the groove 28 a of the pressing attachment plate 28. The presser mounting plate 28 and the side surface block 27 of the presser block 25 are tightened with a fixing bolt 28b to be integrated. Similarly, the stopper 26 and the side block 27 are integrated with a fastening bolt (not shown). Further, in the presser block 25, a bolt insertion hole in which a female screw is formed penetrates from the outer surface 28c of the presser mounting plate 28 to the groove 28a, and a tightening bolt 28d is screwed. And by making the front-end | tip of the clamping bolt 28d protrude in the groove | channel 28a side, it is possible to press the pressing plate 29 and to clamp the separator 16 between the pressing plate 29 and the stopper 26 in the arrangement direction. In the tightened state, as shown in FIG. 6, in a pair of adjacent separators 16, one first top plate 18 and separator body 17, and the other second top plate 19 and separator body 17 Thus, one plug alignment plate 12 is formed. In the present embodiment, since 27 separators 16 are arranged as described above, 26 sets of plug alignment plates 12 are configured. On the other hand, if the tightening bolt 28d is loosened and the presser plate 29 is pulled out, a gap can be formed between the separators 16. Although not shown, the base plate 11 is a frame-like member in which the range in which the separator 16 is disposed is hollowed out, and only the stopper 26 and the side block 27 are placed.

  Here, as shown in FIG. 6, the plug aligning plate 12 composed of the pair of separators 16 with the tightening bolts 28d tightened includes a pair of separator bodies 17, 17, a first top plate 18, and The first top plate 18 and the second top plate 19 are constituted by the main body portion 12a constituted by the second top plate 19, the accommodating portion 12b formed by the main body portion 12a, and the projecting portions 22 and 23. And a substantially cylindrical support portion 12c that protrudes upward. The accommodating portion 12b is a space formed by the main body portion 12a, that is, an opening 12d is formed at a position facing the first top plate 18 and the second top plate 19 constituting the main body portion 12a. .

  In the present embodiment, as described above, each of the separators 16 is provided with 22 protrusions 22 and 23, so that a total of 22 sets of support portions 12c are configured. Furthermore, in this embodiment, since 26 sets of plug alignment plates 12 are arranged, a total of 572 sets (= 26 × 22) of support portions 12c are formed by the arranged plug alignment plates 12. Further, the support portion 12c is formed with a through hole 12e that is formed by the grooves 18b and 19b and communicates the storage portion 12b with the outside. Furthermore, substantially rectangular leg insertion holes 12 f are formed on both sides of the support portions 12 c arranged at equal intervals by the grooves 18 c and 19 c of the adjacent separators 16. Then, as shown in FIG. 6, by accommodating the plug pallet 30 on which the plurality of plugs 54 are mounted in the accommodating portion 12b of each plug alignment plate 12, the plurality of plugs 54 are supported by the corresponding supporting portions 12c. It will be in the state. Hereinafter, the configuration of the plug pallet 30 and the details of the state in which the plug pallet 30 is accommodated in the plug alignment plate 12 will be described.

  As shown in FIGS. 8 and 9, the plug pallet 30 includes a substantially plate-shaped pallet main body 31, a plurality of fixing portions 32 for removably fixing the plug 54 to the pallet main body 31, and both side edges of the pallet main body 31. The leg part 33 provided in 31a and protruding from the upper edge part 31b is provided. The cross-sectional shape of the leg 33 is formed in a substantially rectangular shape corresponding to the leg insertion hole 12f of the plug alignment plate 12, and can be inserted into the leg insertion hole 12f. Further, the fixing portion 32 is provided on the one surface 31c of the pallet main body 31 along the upper edge portion 31b at substantially equal intervals with the support portion 12c of the plug alignment plate 12. Here, each fixing portion 32 includes a pair of leaf springs 34 and 34 which are a pair of urging means for fixing the two outer lead portions 58 b of the corresponding plug 54.

  More specifically, as shown in FIG. 9, the pallet main body 31 is formed with a pair of through holes 31 d corresponding to the respective fixing portions 32. And each leaf | plate spring 34 of the fixing | fixed part 32 is arrange | positioned from the one surface 31c of the pallet main body 31 to the other surface 31e on the opposite side in the corresponding through-hole 31d. The leaf spring 34 includes a main body portion 34a formed in a substantially U-shape, and a contact portion 34c that is folded outward from both ends 34b of the main body portion 34a. The main body 34 a protrudes from the through hole 31 d toward the one surface 31 c in a state where the contact 34 c is in contact with the other surface 31 e of the pallet main body 31. Further, in the main body portion 34a, a part of the opposing side plates in the width direction is expanded outward as a locking portion 34d. The length of the locking portion 34d is set so that the distance between the contact portion 34c and the tip of the locking portion 34d is smaller than the thickness of the pallet body 31. For this reason, the leaf spring 34 holds the pallet main body 31 between the contact portion 34c and the locking portion 34d by its urging force, and maintains the state of being disposed in the through hole 31d.

  When the outer lead portion 58b of the plug 54 is inserted between the locking portion 34d and the one surface 31c of the pallet main body 31, the outer lead portion 58b is engaged with the one surface 31c of the pallet main body 31 by the urging force of the leaf spring 34. It is in a state of being sandwiched between the stop portion 34d. That is, the plug 54 is a piezoelectric vibrating piece connected to the stem 57 and the inner lead portion 58a from the upper edge portion 31b by sandwiching the two outer lead portions 58b by the pair of leaf springs 34 of the fixed portion 32, respectively. It is fixed to the plug pallet 30 with the 52 protruding upward. A plurality of plugs 54 can be arranged at equal intervals along the upper edge portion 31b of the pallet main body 31 by the plurality of fixing portions 32. In this embodiment, 22 sets of fixing portions 32 are provided. Thus, 22 plugs 54 can be fixed. On the other hand, if both ends 34b of the body part 34a of the leaf spring 34 are pressed from the other surface 31e side of the pallet body 31, the locking part 34d can be separated from the outer lead part 58b. For this reason, in each fixing part 32, the state fixed to the plug pallet 30 of each plug 54 can be cancelled | released by pressing the both ends 34b of the main-body part 34a of the leaf | plate spring 34. FIG.

  Then, as shown in FIG. 6, when the plug pallet 30 is accommodated in the accommodating portion 12b of each plug alignment plate 12, the leg portion 33 is inserted into the leg portion insertion hole 12f and protrudes upward. The pallet 30 is positioned within the housing portion 12b. Further, in the state where the plug pallet 30 is positioned in this way, the positional relationship between the fixing portion 32 and the leg portion 33 is set so that each fixing portion 32 is disposed to face each support portion 12c of the plug alignment plate 12. Has been. For this reason, each plug 54 fixed to the plug pallet 30 has the outer lead portion 58b inserted through the through hole 12e of each support portion 12c, and the support portion 12c abuts on the other end surface 57b of the stem 57, so that the plug 54 Is in a state of being supported by the support portion 12c with the piezoelectric vibrating piece 52 protruding upward.

  Further, as shown in FIGS. 4 and 10, the stem guide plate 13 disposed on the upper side of the plug alignment plate 12 is set to have a thickness substantially equal to or larger than the length of the stem 57 in the direction of the central axis L57. It is a substantially plate-shaped member. Further, the stem guide plate 13 is formed with a plurality of stem insertion holes 13a penetrating therethrough corresponding to the support portions 12c of the plug alignment plate 12. In this embodiment, 572 (= 22 × 26) locations are formed. ing. The stem insertion hole 13a is set to have an inner diameter that is substantially equal to the outer diameter of the stem 57 of the plug 54 and that allows the stem 57 to be inserted and removed. More specifically, as shown in FIG. 10, when the stem 57 is inserted, the inner diameter of the stem insertion hole 13a is accurately set in the radial direction perpendicular to the direction of the central axis L13 of the stem insertion hole 13a without a gap. The inner diameter of the stem 57 is precisely machined so that it does not rub against the outer peripheral surface of the stem 57 when moved forward and backward in the direction of the central axis L13. Further, outside the arrangement of the stem insertion holes 13a, leg insertion holes 13b corresponding to the leg insertion holes 12f of the plug arrangement plate 12 are formed along the direction in which the plug alignment plate 12 is arranged. The leg insertion hole 13b is formed in a size that allows the leg 33 of the plug pallet 30 to be inserted.

  As shown in FIGS. 4 and 10, the case guide plate 14 disposed on the upper side of the stem guide plate 13 is a substantially plate-like member whose thickness is set to be substantially equal to the length of the case 53. Similarly to the stem guide plate 13, the case guide plate 14 also has a plurality of case accommodation holes 14 a penetrating therethrough corresponding to the support portions 12 c of the plug alignment plate 12. In this embodiment, 572 places are formed. Has been. The case accommodation hole 14 a is formed to have an inner diameter substantially equal to the outer diameter of the case 53, and can accommodate the case 53. More specifically, as shown in FIG. 10, the case receiving hole 14a has an inner diameter that can accommodate the case 53 and can accurately position the case 53 in the radial direction perpendicular to the direction of the central axis L14 of the case receiving hole 14a. As will be described later, when the stem 57 is press-fitted into the case 53, it is set to be slightly larger than the outer diameter of the case 53 before press-fitting, corresponding to the opening 53a that slightly expands in diameter. Then, by placing the upper plate 15 on the upper surface of the case guide plate 14, the upper portion of the case accommodation hole 14a is sealed, and the case 53 accommodated in the case accommodation hole 14a and the case guide plate 14 are integrated. It can be moved downward. The upper plate 15 is a substantially plate-like member and is formed in a size corresponding to the case guide plate 14.

  Further, the side block 27 is provided with a ball guide 27a that supports the guide pin 2a so as to be able to advance and retreat in the axial direction so as to open to the upper surface 27b. The stem guide plate 13 and the case guide plate 14 are respectively formed with guide insertion holes 13c and 14b through which the guide pins 2a can be inserted, corresponding to the ball guides 27a. Then, in a state where the guide pin 2a is inserted into each ball guide 27a of the side block 27 and protrudes upward, the guide pin 2a is inserted into the guide insertion hole 13c of the stem guide plate 13 and the guide insertion hole 14b of the case guide plate 14. When inserted into the case guide plate 14, the case accommodation hole 14 a of the case guide plate 14, the stem insertion hole 13 a of the stem guide plate 13, and the support portion 12 c of the plug alignment plate 12 are arranged coaxially.

  Here, a spring composed of a first spring 27 c and a second spring 27 d is erected on the upper surface 27 b of the side block 27. More specifically, the upper surface 27b of each side block 27 is provided with one first spring 27c at substantially the center, and the second spring 27d having a larger elastic coefficient than the first spring 27c on both sides thereof. Are provided one by one, and a total of six springs are erected on the pair of side blocks 27. Then, as shown in FIG. 10, when the guide pin 2a is inserted through the plug alignment plate 12 and the stem guide plate 13, the case guide plate 14, and the upper plate 15 are assembled, these are connected to the guide pin 2a. It descends by the guidance of the ball guide 27a. The stem guide plate 13, the case guide plate 14, and the upper plate 15 stop at a place where their own weight and the reaction force of the first spring 27 c and the second spring 27 d balance, and the stem guide plate 13 is The plug alignment plate 12 is disposed with a predetermined distance from the main body 12a. Further, the case guide plate 14 is in contact with the stem guide plate 13. Here, the combined elastic coefficient of the first spring 27 c and the second spring 27 d is balanced with the weight of the stem guide plate 13, the case guide plate 14, and the upper plate 15, and the upper surface 13 d of the stem guide plate 13. Is set to be substantially equal to or slightly lower than the position of the one end surface 57a of the stem 57 supported by the support portion 12c of the plug alignment plate 12 in the height direction.

Further, an adjustment plate 27e is placed on the upper surface 27b of the side block 27 except for a range where the first spring 27c, the second spring 27d, and the ball guide 27a are provided. The upper surface 27f of the adjusting plate 27e is processed and adjusted so that the flatness and the position in the height direction are accurate. A load is applied from the upper plate 15 by the press-fitting means 5, and the lower surface 13e of the stem guide plate 13 is applied. Is set so that the opening 53a of the case 53 is lowered to the press-fitting completion position in a state where it is in contact with the upper surface 27f of the adjustment plate 27e.
As mentioned above, although the detail of the structure of the press-fit type | mold 2 was demonstrated, as what forms each structure of the press-fit type | mold 2, age hardening type alloy steel is used suitably. Age-hardening alloy steel is excellent in workability, has little distortion during use, and is a material suitable for precision molds such as the press-fit mold 2 in the press-fit apparatus 1 of the present invention.

  Next, details of a method for manufacturing the piezoelectric vibrator 51 by press-fitting the stem 57 of the plug 54 of the case 53 using the press-fitting device 1 will be described. 11 and 12 are flowcharts showing the manufacturing process of the piezoelectric vibrator 51. FIG. 11 shows the entire manufacturing process of the piezoelectric vibrator, and FIG. 12 shows the details of the sealing process.

  First, as shown in FIG. 11, the plug preparation step S1 and the vibrating piece joining step S2 are performed, and the plug 54 to which the piezoelectric vibrating piece 52 is connected is arranged on the plug pallet 30 as shown in FIG. That is, as the plug preparation step S1, the outer lead portion 58b of the plug 54 is fixed to each fixing portion 32 of the plug pallet 30, and the plug 54 is aligned along the upper edge portion 31b of the pallet main body 31. As a result, each plug 54 is in a state in which the stem 57 and the inner lead portion 58a protrude from the upper edge portion 31b of the pallet main body 31 on the plug pallet 30. The amount by which the stem 57 protrudes from the upper edge portion 31b of the pallet main body 31 is determined by the support portion 12c while the plug pallet 30 is accommodated in the accommodating portion 12b of the plug aligning plate 12 in the plug aligning step S51 described later. Is an amount that can be supported so that the plugs 54 arranged are substantially equal.

  Then, as the vibration piece joining step S2, the state as shown in FIG. 8 is obtained by joining the piezoelectric vibration pieces 52 to the inner lead portions 58a of the aligned plugs 54, respectively. Next, as shown in FIG. 11, as a baking step S3, the piezoelectric vibrating piece 52 is placed in a heating furnace while being fixed to the plug pallet 30, and is baked at a predetermined temperature in a vacuum atmosphere for a predetermined time. To remove distortion. Next, as a fine adjustment step S4, the metal film formed as a fine adjustment portion (not shown) of the piezoelectric vibrating piece 52 is evaporated by, for example, laser light, and the resonance frequency is finely adjusted. Note that by performing the steps from the resonator element joining step S2 to the fine adjustment step S4 after the plug preparation step S1, a plurality of plugs 54 can be handled in units of the plug pallet 30 in these steps. For this reason, each process can be performed efficiently.

  Next, as a sealing step S5, the plug 54 to which the piezoelectric vibrating piece 52 is bonded on the plug pallet 30 is press-fitted into the case 53, and the plug 54 to which the piezoelectric vibrating piece 52 is bonded and the case 53 are assembled. First, as shown in FIG. 12, in the plug alignment step S <b> 51, the plugs 54 are aligned on the plug alignment plate 12 while being fixed to the plug pallet 30. That is, a plurality of separators 16 are arranged on the base plate 11 and sandwiched by the holding block 25, the stopper 26, and the pair of side surface blocks 27 so that the plug alignment plate 12 is arranged. (S51a).

  Next, as shown in FIG. 13, in the presser block 25, a clearance is formed between the separators 16 by loosening the tightening bolts 28 d and pulling out the presser plate 29. Then, using the formed gap, the plug pallet 30 on which the plug 54 that has been completed up to the fine adjustment step S4 is inserted into the accommodating portion 12b of each plug alignment plate 12 constituted by the separators 16 adjacent to each other. (S51b). At this time, in the plug pallet 30, the other end surface 57 b of the stem 57 protruding from the upper edge portion 31 b of the pallet main body 31 is brought into contact with the protruding portions 22 and 23. Then, after inserting the plug pallet 30 into the accommodating portions 12b of all the plug alignment plates 12, the pressing plate 29 is inserted into the groove 28a of the pressing attachment plate 28, and the tightening bolt 28d is tightened. As a result, the separators 16 are arranged in close contact with each other to form the plug alignment plate 12. In each plug alignment plate 12, the plug pallet 30 is accommodated in the accommodating portion 12 b, and the support portion 12 c comes into contact with the other end surface 57 b of the stem 57, whereby the upper edge portion of the pallet main body 31 of each plug pallet 30. The plug 54 protruding from 31b is supported by the plug alignment plate 12.

  As shown in FIG. 14, by tightening the fastening bolt 28 d, the adjacent separators 16 are brought into close contact with each other, and the pressing member 24 provided on the separator body 17 is attached to the body of each leaf spring 34 at the fixing portion 32. The both ends 34b of the part 34a will be pressed. For this reason, in the state where the fastening bolts 28d are tightened and the separators 16 are in close contact with each other, the plug 54 is supported by the support portion 12c, while the state fixed to the plug pallet 30 is released.

  Next, as shown in FIG. 12, the stem guide plate 13 is mounted as a stem fixing step S52. That is, in FIG. 4, the guide pin 2 a is inserted into the ball guide 27 a of the side block 27. By inserting the guide pin 2a through the guide insertion hole 13c of the stem guide plate 13 in this state, the stem guide plate 13 is mounted on the first spring 27c and the second spring 27d erected on the side block 27. And is spaced from the plug alignment plate 12. Here, each side block 27 is provided with a first spring 27c substantially at the center, and on both sides thereof, a second spring 27d having a larger elastic coefficient than the first spring 27c is provided. Thus, the stem guide plate 13 can be disposed exactly parallel to the upper surface 27 b of the side block 27. Further, the stem guide plate 13 is positioned by the guide pins 2a, and the support portions 12c of the plug alignment plate 12 and the stem insertion holes 13a of the stem guide plate 13 are arranged coaxially as described above. As shown, each stem 57 supported by the support portion 12c is inserted into the stem insertion hole 13a. For this reason, the stem guide plate 13 can move forward and backward in the direction of the central axis L13 of the stem insertion hole 13a, and the stems 57 are externally fixed and restricted in a radial direction perpendicular to the central axis L13. Similarly, when the stem guide plate 13 is positioned by the guide pins 2a, the leg insertion holes 12f of the plug alignment plate 12 and the leg insertion holes 13b of the stem guide plate 13 are also arranged coaxially. Therefore, the leg portion 33 of each plug pallet 30 protruding upward from the leg insertion hole 12f of the plug alignment plate 12 is inserted into the leg insertion hole 13b of the stem guide plate 13 and protrudes upward. .

  Next, as shown in FIG. 12, in the plug pallet removal step S53, the plug pallet 30 accommodated in the accommodating portion 12b of the plug alignment plate 12 is detached from each plug 54 and removed. That is, as shown in FIG. 15, the integrated base plate 11, plug alignment plate 12, stem guide plate 13, pressing block 25, stopper 26, and side block 27 are set in the press device 60. When the handle 61 is operated to lower the press plate 62 from above, the plug pallet 30 protruding from the leg insertion hole 12f of each plug alignment plate 12 and the leg insertion hole 13b of the stem guide plate 13 is provided. The leg 33 is pushed down. Here, as shown in FIG. 16, since the fixing of the plug 54 by the fixing portion 32 of the plug pallet 30 is released in the plug alignment step S51, only the plug pallet 30 is pushed down, and the plug 54 is supported by the support portion 12c. It will be in the state still supported by. The plug pallet 30 is pushed down to a state where the pressing member 24 of the plug alignment plate 12 and the leaf spring 34 of the fixing portion 32 of the plug pallet 30 do not contact with each other, so that the plug pallet 30 is restrained from the plug alignment plate 12. Canceled. For this reason, the plug pallet 30 dropped from the base plate 11 through the opening 12d facing the first top plate 18 and the second top plate 19 provided with the leg insertion holes 12e, and was removed. It becomes a state.

  Next, as shown in FIG. 12, the case guide plate 14 is disposed on the stem guide plate 13 as a case guide plate mounting step S54. That is, in FIG. 4, the guide pin 2a protruding upward from the stem guide plate 13 is inserted into the guide insertion hole 14b of the case guide plate 14, and the case guide plate 14 is disposed in contact with the upper surface 13d of the stem guide plate 13. Let Thereby, each case accommodation hole 14a of the case guide plate 14 is arranged coaxially with the stem insertion hole 13a of the corresponding stem guide plate 13, and the piezoelectric vibration connected to the inner lead portion 58a of each plug 54. The piece 52 is housed in the case housing hole 14a.

  Here, as in the above process, the plug alignment plate 12, the stem guide plate 13, and the case guide plate 14 are assembled to align the plug 54, while the case 53 is prepared in a separate process. That is, as shown in FIG. 12, first, a case 53 processed in advance into a predetermined shape is prepared (step S61). Then, after degassing the case 53 (step S62), each case 53 is loaded into a preliminary accommodation hole of a case alignment preliminary plate (not shown) (step S63). Here, each preliminary accommodation hole of the case alignment spare plate is arranged corresponding to the case accommodation hole 14 a of the case guide plate 14. Further, a detachable bottom plate is provided below the case accommodation hole 14a, and the case 53 is held in the preliminary accommodation hole.

  Next, as shown in FIG. 12, as the case preparation step S <b> 55, the case 53 aligned with a case alignment preliminary plate (not shown) is loaded into the case accommodation hole 14 a of the case guide plate 14. The case alignment spare plate in which the case 53 is accommodated is placed on the upper surface of the case guide plate 14 and the bottom plate of the case alignment spare plate is removed, so that the case 53 is changed from each preliminary accommodation hole to the corresponding case accommodation hole 14a. It will be loaded. Here, as shown in FIG. 10, the case receiving hole 14 a of the case guide plate 14 is arranged so that the central axis L 14 is coaxial with the central axis L 13 of the stem insertion hole 13 a of the stem guide plate 13. . Further, the inner diameter of the case 53 is set slightly smaller than the outer diameter of the stem 57. For this reason, the case 53 accommodated in the case accommodation hole 14a of the case guide plate 14 is disposed on the stem 57 so that the central axis L53 is coaxial with the central axis L57 of the corresponding stem 57. Become. In this state, the press-in mold 2 is assembled by placing the upper plate 15 on the case guide plate 14.

  Next, as shown in FIG. 12, as a press-fitting step S <b> 56, the stem 57 of the plug 54 is press-fitted into the case 53 in a state of being loaded into the press-fitting mold 2 by the press-fitting means 5. That is, as shown in FIG. 1, a plurality of press-fit dies 2 assembled as described above are inserted between the heater blocks 3 held by the springs 6a. (Step S56a). In this state, the hermetic chamber 4 is evacuated by an evacuation unit (not shown), and the heater block 3 is heated by a heating unit (not shown) to adjust the entire press-fitting die 2 to a predetermined temperature. Here, as shown in FIG. 10, the opening 53 a of the case 53 is in a state of lightly contacting the one end surface 57 a of the stem 57. For this reason, the air (residual gas) inside the case 53 is evacuated from the gap between the contact portions. Then, as shown in FIG. 1, the press-fit mold 2 is loaded by pressurizing the press-fit mold 2 with the hydraulic cylinder 8 while keeping the degree of vacuum inside the hermetic chamber 4 and the temperature of the press-fit mold 2 constant. Each plug 54 is press-fitted into the corresponding case 53, and the case 53 is vacuum-sealed (step S56b).

  That is, as shown in FIG. 17, in each press-fit mold 2, the case guide plate 14 descends with the guide pins 2 a as a guide with respect to the press alignment plate 12, whereby the case 53 and the case guide plate 14 are lowered. Then, it descends toward the stem 57 supported by the support portion 12c. At this time, the stem guide plate 13 is disposed at a distance from the plug alignment plate 12 and the stem 57 is inserted in the stem insertion hole 13a in a detachable manner. For this reason, the stem guide plate 13 descends following the case guide plate 14, and maintains a state in which the stem 57 is fitted and fixed so as not to be eccentric with respect to the case 53. As a result, the stem 57 is accurately press-fitted into the opening 53 a of the case 53 by the reaction force from the support portion 12 c of the plug alignment plate 12 while being kept coaxial with the case 53. Then, by press-fitting until the lower surface 13e of the stem guide plate 13 and the upper surface 27f of the adjustment plate 27e come into contact with each other, the inside of the case 53 is evacuated, and the stem 57 of the plug 54 is pressed into the case 53 to the press-fitting completion position. The piezoelectric vibrator 51 is assembled. Here, in the press-fitting step S56, the plug pallet 30 is removed from each plug 54 by the plug pallet detaching step S53 and is not in the press-fitting die 2. For this reason, in the press-fitting step S56, the inside of the case 53 can be hermetically sealed in a more vacuum state without being affected by gas generation from the plug pallet 30.

  Further, the stem 57 is supported by the support portion 12 c of the plug alignment plate 12 at a position inside the outer periphery of the stem 57 so as to be separated from the main body portion 12 a. Further, the thickness of the stem guide plate 13 is set to be substantially equal to or larger than the length of the stem 57 in the direction of the central axis L57. For this reason, at the start of press-fitting by the press-fitting means 5, the stem 57 can be externally fitted and fixed by the stem guide plate 13 in the entire direction of the central axis L 57, and the stem 57 can be more securely kept coaxial with the case 53. On the other hand, as the press-fitting progresses, the stem guide plate 13 can be retracted to the main body 12a side of the plug alignment plate 12. That is, while the outside of the stem 57 is not press-fitted into the case 53 by the stem guide plate 13, the lower surface 13e of the stem guide plate 13 and the upper surface 27f of the adjustment plate 27e come into contact with each other until the press-fitting completion position is reached. The stem 57 can be press-fitted more securely while being coaxial with the case 53.

  Then, when the press-fitting is completed, the load by the press-fitting means 5 is removed, and each press-fitting die 2 is taken out (step S57). Next, in each press-fit mold 2, the upper plate 15, the case guide plate 14, and the stem guide plate 13 are sequentially removed, the piezoelectric vibrator 51 is taken out from the plug alignment plate 12 (step S58), and the sealing step S5 is completed. It becomes.

  Next, as shown in FIG. 11, the extracted piezoelectric vibrator 51 is screened at a predetermined temperature in a vacuum or in the atmosphere in order to stabilize the frequency (step S6). Thereafter, electrical characteristics such as a resonance frequency and a resonance resistance value are inspected (step S7). And about the acceptable product, the piezoelectric vibrator 51 is packed as a product (step S8).

  As described above, the press-fitting device 1 of the present embodiment includes the stem guide plate 13, the case guide plate 14, and the press-fitting means 5, so that the stem fixing step S 52, the case preparation step S 55, and Through the press-fitting step S56, the stem 57 of the plug 54 can be accurately press-fitted into the case 53 on the same axis. For this reason, the airtightness inside the case 53 is deteriorated, or the piezoelectric vibrating piece 52 is disposed obliquely and the tip end portion 52b does not contact the inner peripheral surface of the case 53, so that the predetermined frequency is reached. Thus, it is possible to manufacture a highly reliable piezoelectric vibrator 51 capable of stably vibrating the piezoelectric vibrating piece. Therefore, the piezoelectric vibrator 51 can be manufactured with good yield and low cost.

  In the press-fitting die 2 of the present embodiment, the case guide plate 14 has a case receiving hole 14a that penetrates, and the upper plate 15 is placed and pressed during the press-fitting step S56. It is not a thing. The case receiving hole 14a may be opened only on the lower surface of the case guide plate 14, and the upper plate 15 may be omitted.

  Further, the plug pallet 30 is removed from the plug 54 in the plug pallet detachment step S53, but the present invention is not limited to this when the influence of degassing from the plug pallet 30 is small. Further, the plug alignment plate 12 has the accommodating portion 12b that can accommodate the plug pallet 30, and the plug 54 is supported by the plug alignment plate 12 while being fixed to the plug pallet 30. It is not a thing. At least the stem 57 of the plug 54 is supported by the plug alignment plate 12 with the stem 57 itself and the piezoelectric vibrating piece 52 projecting, and the press-fitting step S56 is performed with the stem guide plate 13 being externally fitted and fixed. Thus, the stem 57 of the plug 54 can be accurately press-fitted into the case 53.

  In the manufacturing process of the piezoelectric vibrator using the press-fitting device 1 described above, the cylinder package type piezoelectric vibrator 51 has been described. It may be a type package type piezoelectric vibrator.

(Second Embodiment)
FIG. 18 shows a second embodiment according to the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  FIG. 18 is a schematic view showing a configuration of a tuning fork type crystal oscillator according to the present invention, and shows a plan view of a surface mount type piezoelectric oscillator using the above-described piezoelectric vibrator. As shown in FIG. 18, the oscillator 100 of this embodiment is configured by configuring a cylinder package type piezoelectric vibrator 51 as an oscillator electrically connected to an integrated circuit 101. Since the piezoelectric vibrator 51 is the same as that of the first embodiment, the description thereof is omitted. The oscillator 100 includes a substrate 103 on which an electronic component 102 such as a capacitor is mounted. An integrated circuit 101 for an oscillator is mounted on the substrate 103, and the piezoelectric vibrator 51 is mounted in the vicinity of the integrated circuit 101. The electronic component 102, the integrated circuit 101, and the piezoelectric vibrator 51 are electrically connected by a wiring pattern (not shown). Each component is molded with a resin (not shown).

  In the oscillator 100 configured as described above, when a voltage is applied to the piezoelectric vibrator 51, the piezoelectric vibrating piece 52 in the piezoelectric vibrator 51 vibrates, and this vibration is converted into an electric signal by the piezoelectric characteristics of the quartz crystal and integrated. An electric signal is input to the circuit 101. The input electrical signal is subjected to various processes by the integrated circuit 101 and is output as a frequency signal. Thereby, the piezoelectric vibrator 51 functions as an oscillator. Further, by selectively setting the configuration of the integrated circuit 101, for example, an RTC (real-time clock) module or the like according to a request, the operation date and time of the device and the 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.

As described above, according to the oscillator 100 of the present embodiment, the piezoelectric vibration that can be produced with good yield and low cost as described above, and can stably vibrate the piezoelectric vibrating piece 52 at a predetermined frequency. By providing the child 51, a highly reliable oscillator can be provided at low cost.
The oscillator 100 has been described as including the cylinder package type piezoelectric vibrator 51. However, the present invention is not limited to this and may be a resin-sealed surface mount package type piezoelectric vibrator.

(Third embodiment)
FIG. 19 shows a third embodiment according to the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  In this embodiment, a portable information device having the above-described piezoelectric vibrator 51 will be described as an example of an electronic device. FIG. 19 is a block diagram showing the configuration of the electronic device. As shown in FIG. 19, the portable information device 110 of this embodiment includes a piezoelectric vibrator 51 and a power supply unit 111 for supplying power. The power supply unit 111 is composed of, for example, a lithium secondary battery. The power supply unit 111 includes a control unit 112 that performs various controls, a clock unit 113 that counts time, a communication unit 114 that communicates with the outside, a display unit 115 that displays various types of information, A voltage detection unit 116 that detects the voltage of the functional unit is connected in parallel. The power unit 111 supplies power to each functional unit.

  The control unit 112 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 112 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 of the CPU.

  The timer unit 113 includes an integrated circuit including an oscillation circuit, a register circuit, a counter circuit, an interface circuit, and the like, and the piezoelectric vibrator 51. When a voltage is applied to the piezoelectric vibrator 51, the piezoelectric vibrating piece 52 vibrates, and this 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 112 via the interface circuit, and the current time, current date, calendar information, or the like is displayed on the display unit 115.

  The communication unit 114 has functions similar to those of a conventional mobile phone, and includes a radio unit 117, a voice processing unit 118, a switching unit 119, an amplification unit 120, a voice input / output unit 121, a telephone number input unit 122, and a ring tone generation unit. 123 and a call control memory unit 124. The wireless unit 117 exchanges various data such as audio data with the base station via the antenna 125. The audio processing unit 118 encodes and decodes the audio signal input from the radio unit 117 or the amplification unit 120. The amplifying unit 120 amplifies the signal input from the audio processing unit 118 or the audio input / output unit 121 to a predetermined level. The voice input / output unit 121 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 123 generates a ring tone in response to a call from the base station. The switching unit 119 switches the amplifying unit 120 connected to the voice processing unit 118 to the ringing tone generating unit 123 only when an incoming call is received, so that the ringing tone generated in the ringing tone generating unit 123 is transmitted via the amplifying unit 120. To the audio input / output unit 121. The call control memory unit 124 stores a program related to incoming / outgoing call control of communication. The telephone number input unit 122 includes, for example, a number key from 0 to 9 and other keys. By pressing these number keys and the like, a telephone number of a call destination is input.

  When the voltage applied to each functional unit such as the control unit 112 by the power supply unit 111 falls below a predetermined value, the voltage detection unit 116 detects the voltage drop and notifies the control unit 112 of the voltage drop. . The predetermined voltage value at this time is a value set in advance as a minimum voltage necessary for stably operating the communication unit 114, and is, for example, about 3V. Upon receiving the voltage drop notification from the voltage detection unit 116, the control unit 112 prohibits the operations of the radio unit 117, the voice processing unit 118, the switching unit 119, and the ring tone generation unit 123. In particular, it is essential to stop the operation of the wireless unit 117 with high power consumption. Further, the display unit 115 displays that the communication unit 114 has become unusable due to insufficient battery power.

  That is, the operation of the communication unit 114 can be prohibited by the voltage detection unit 116 and the control unit 112, and that effect can be displayed on the display unit 115. 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 115. Note that the portable information device 110 includes a power shut-off unit 126 that can selectively shut off the power of the part related to the function of the communication unit 114, and the function of the communication unit 114 is controlled by the power shut-off unit 126. Stop surely.

According to the portable information device 110 of this embodiment, the piezoelectric vibrator 51 that can be produced with good yield and low cost as described above, and can stably vibrate the piezoelectric vibrating piece 52 at a predetermined frequency. By providing, a portable information device with high reliability can be provided at low cost.
The portable information device 110 has been described as including the cylinder package type piezoelectric vibrator 51. However, the portable information device 110 is not limited to this, and is not limited thereto. A piezoelectric vibrator may be used. If such a surface mount package type piezoelectric vibrator is mounted, it is more preferable because it can be connected to a printed circuit board by reflow soldering simultaneously with other electronic components.

(Fourth embodiment)
FIG. 20 shows a fourth embodiment according to the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  In this embodiment, a radio timepiece having the above-described piezoelectric vibrator 51 will be described as an embodiment of the radio timepiece. FIG. 20 is a block diagram showing the configuration of this radio timepiece. As shown in FIG. 20, a radio timepiece 130 of this embodiment includes a piezoelectric vibrator 51 electrically connected to a filter unit 131, and receives a standard radio wave including timepiece information to accurately 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 the property of propagating the surface of the earth and the property of propagating while reflecting the ionosphere and the surface of the earth, so the propagation range is wide, and the above two transmitting stations cover all of Japan. is doing.

  The antenna 132 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 133 and filtered and tuned by the filter unit 131 having the plurality of piezoelectric vibrators 51. The piezoelectric vibrator 51 includes piezoelectric vibrator portions 134 and 135 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 136. Then, the time code is taken out via the waveform shaping circuit 137 and counted by the CPU 138. The CPU 138 reads information such as the current year, accumulated date, day of the week, and time. The read information is reflected on the RTC 139, and accurate time information is displayed. Since the carrier wave is 40 kHz or 60 kHz, the piezoelectric vibrators 134 and 135 are preferably piezoelectric vibrators having the tuning fork type structure described above. Taking 60 kHz as an example, as a dimension example of the tuning fork type vibrator piece, it is possible to configure the tuning fork vibrator piece with a length of about 2.8 mm and a width of the base portion of about 0.5 mm.

According to the radio-controlled timepiece 130 of this embodiment, the piezoelectric vibrator 51 that can be produced at a low yield with a small yield as described above and can stably vibrate the piezoelectric vibrating piece 52 at a predetermined frequency. By providing, a highly reliable radio-controlled timepiece can be provided at low cost.
Although the above-described radio timepiece 130 has been described as including the cylinder package type piezoelectric vibrator 51, the present invention is not limited thereto, and may be a resin-sealed surface mount package type piezoelectric vibrator.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general view which shows the outline | summary of the press injection apparatus of 1st Embodiment of this invention. It is the top view which fractured | ruptured some piezoelectric vibrators of 1st Embodiment of this invention. It is the side view which fractured | ruptured some piezoelectric vibrators of 1st Embodiment of this invention. 1 is an exploded view of a press-fitting type of a press-fitting device according to a first embodiment of the present invention. It is a top view of the plug alignment plate of the press-fitting device according to the first embodiment of the present invention. FIG. 6 is a cross-sectional view taken along line AA ′ of FIG. 5 in the plug alignment plate of the press-fitting device according to the first embodiment of the present invention. It is a front view of the separator of the press-fit apparatus of 1st Embodiment of this invention. It is a front view of the plug pallet used in the press-fitting device according to the first embodiment of the present invention. It is sectional drawing of the plug pallet used in the press injection apparatus of 1st Embodiment of this invention. It is sectional drawing of the press injection type of the press injection apparatus of 1st Embodiment of this invention. It is a flowchart which shows the whole manufacturing process of the piezoelectric vibrator of 1st Embodiment of this invention. It is a flowchart which shows the detail of a sealing process in the manufacturing process of the piezoelectric vibrator of 1st Embodiment of this invention. It is explanatory drawing which shows a plug alignment process in the manufacturing process of the piezoelectric vibrator of 1st Embodiment of this invention. In the manufacturing process of the piezoelectric vibrator according to the first embodiment of the present invention, it is an explanatory view showing a plug fixing release state by a plug pallet in a plug alignment process. It is explanatory drawing which shows a plug pallet removal process in the manufacturing process of the piezoelectric vibrator of 1st Embodiment of this invention. In the manufacturing process of the piezoelectric vibrator according to the first embodiment of the present invention, it is an explanatory view showing a state in which the plug pallet is detached in the plug pallet removing process. It is explanatory drawing which shows a press injection process in the manufacturing process of the piezoelectric vibrator of 1st Embodiment of this invention. It is a schematic diagram of the oscillator of 2nd Embodiment of this invention. It is a block diagram of the electronic device of the 3rd Embodiment of this invention. It is a block diagram of the radio timepiece of a 4th embodiment of this invention. It is explanatory drawing which shows the malfunction example of the piezoelectric vibrator by the conventional press-fitting apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press-fit apparatus 5 Press-fit means 12 Plug alignment plate 12a Main body part 12b Accommodation part 12c Support part 13 Stem guide plate 13a Stem insertion hole 14 Case guide plate 14a Case accommodation hole 24 Press member 30 Plug pallet 31 Pallet body 32 Fixing part 34 Plate spring (Biasing means)
51 Piezoelectric Vibrator 52 Piezoelectric Vibrating Piece 53 Case 53a Opening 54 Plug 57 Stem 58 Lead 58a Inner Lead 58b Outer Lead 100 Oscillator 110 Portable Information Device (Electronic Device)
130 Radio Clock L13 Center Axis of Stem Insertion Hole L14 Center Axis of Case Housing Hole L53 Case Center Axis L57 Stem Center Axis S1 Plug Preparation Step S2 Vibrating Piece Joining Step S51 Plug Alignment Step S52 Stem Fixing Step S53 Plug Pallet Removal Step S55 Case preparation process S56 Press-fitting process

Claims (8)

A plug having a substantially cylindrical shape hermetically sealed inside and a lead inserted into the stem, and a piezoelectric vibrating piece connected to an inner lead portion of the lead protruding from one end surface of the stem of the plug And a manufacturing process of a piezoelectric vibrator having a substantially cylindrical shape with a bottom having an opening, and a case in which the opening is hermetically sealed with the plug in a state where the piezoelectric vibrating piece is disposed inside, A press-fitting device for press-fitting the stem of the plug into the opening of the case;
A plug alignment plate that supports the plug in a state in which the piezoelectric vibrating piece connected to the inner lead portion protrudes by contacting the other end surface opposite to the one end surface of the stem;
A stem insertion hole is provided with a gap from the plug alignment plate and is substantially equal to the outer diameter of the stem of the plug, and has an inner diameter capable of inserting and removing the stem in a supported state. A stem guide plate;
The piezoelectric vibrating piece disposed in contact with the stem guide plate, coaxial with the central axis of the stem insertion hole, substantially equal to the outer diameter of the case, and connected to the supported plug. A case guide plate having a case accommodation hole formed so as to accommodate the case;
The case guide plate, the case accommodated in the case accommodation hole of the case guide plate, and the stem guide plate are directed toward the plug alignment plate along a central axis of the stem insertion hole and the case accommodation hole. And a press-fitting means for moving the press-fitting means. The press-fitting device according to claim 1,
The plug alignment plate includes a main body portion and a support portion that is located on the inner side of the outer periphery of the stem of the plug and protrudes from the main body portion and contacts the other end surface of the stem. apparatus. The press-fitting device according to claim 2,
The thickness of the stem guide plate is set substantially equal to or larger than the length of the stem in the central axis direction. The press-fitting device according to any one of claims 1 to 3,
A substantially plate-like pallet main body, and a plurality of pallet main bodies provided along one side of the pallet main body, the stem, the inner lead portion of the lead, and the piezoelectric vibrating piece connected to the inner lead portion from the pallet main body. A plug pallet having an outer lead portion protruding from the other end face of the stem in the lead and a fixing portion that can be fixed to the pallet main body in a protruded state,
The press-fitting device, wherein the plug alignment plate has an accommodating portion for accommodating the plug pallet in a state where the stems of the plurality of plugs fixed to the plug pallet are in contact with and supported. The press-fitting device according to claim 4,
The fixing portion of the plug pallet includes an urging means capable of holding the outer lead portion of the plug by an urging force and releasing the pinched state by pressing.
The press-fitting device according to claim 1, wherein a pressing member that presses the urging unit in a state where the plug pallet is stored is provided in the storage portion of the plug alignment plate. A plug having a substantially cylindrical shape hermetically sealed inside and a lead inserted into the stem, and a piezoelectric vibrating piece connected to an inner lead portion of the lead protruding from one end surface of the stem of the plug And a case in which the plug is press-fitted into the opening and hermetically sealed in a state of being substantially cylindrical with a bottom and having the piezoelectric vibrating piece disposed therein. Because
A plug alignment step of supporting the plug in a state in which the piezoelectric vibrating piece connected to the inner lead portion is protruded by bringing a plug alignment plate into contact with the other end surface opposite to the one end surface of the stem; ,
By inserting the stem of the plug in a supported state into a stem insertion hole formed in the stem guide plate with an inner diameter substantially equal to the outer diameter of the stem, a central axis of the stem insertion hole by the stem guide plate A stem fixing step for externally fixing and fixing the stem in a state where it can be inserted and removed in a direction;
A case preparing step of inserting the case into a case receiving hole formed in a case guide plate with an inner diameter substantially equal to the outer diameter of the case, so that the case can move integrally with the case guide plate; ,
With the case guide plate in contact with the stem guide plate so that the case accommodation hole is coaxial with the center axis of the stem insertion hole, the case accommodation hole and the stem insertion hole have a central axis. And a press-fitting step of press-fitting the stem into the opening of the case accommodated in the case accommodation hole by moving the case guide plate toward the plug alignment plate along the piezoelectric region. A method for manufacturing a vibrator. It is a manufacturing method of the piezoelectric vibrator according to claim 6,
By fixing an outer lead portion protruding from the other end surface of the stem of the leads, a plurality of the plugs are formed in a substantially plate-like plug pallet in a state where the stem and the inner lead portion of the lead are protruded. A plug preparation process for fixing;
A vibrating piece joining step for joining the piezoelectric vibrating piece to the inner lead portion of each plug fixed to the plug pallet;
In the plug alignment step, the stem of each plug fixed to the plug pallet is abutted and supported in a state where the piezoelectric vibrating reed is connected in the plug preparing step and the vibrating piece joining step. A method of manufacturing a piezoelectric vibrator. It is a manufacturing method of the piezoelectric vibrator according to claim 7,
After the plug alignment step, a plug pallet detachment step of removing the plug pallet from the outer lead portion of the plug,
The method for manufacturing a piezoelectric vibrator, wherein the press-fitting step is performed after the plug pallet removing step.

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