JP2014179771A - Crystal oscillator, oscillator, electronic apparatus and radio clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crystal oscillator the CI value of which can be reduced, and to provide an oscillator including the crystal oscillator and having excellent reliability, an electronic apparatus and a radio clock.SOLUTION: Since the side electrodes 40, 41 are provided on the side faces 31c, 31f different from the side faces 31e, 31f having protrusions of triangular cross section formed toward the center in the thickness direction from the side in contact with first principal surface 31a and second principal surface 31b, out of four side faces 31c-31f, disconnection or reduction of adhesion of the side electrodes 40, 41 can be avoided. Since electric resistance value in the side electrodes 40, 41 can be reduced, the CI value can be reduced.

Description

  The present invention relates to a crystal resonator, an oscillator, an electronic device, and a radio timepiece.

  For example, a quartz crystal using a crystal is used as a time source, a control signal timing source, a reference signal source, and the like in a cellular phone, a portable information terminal device, a radio clock, and the like. As such a quartz resonator, for example, a configuration including a quartz crystal vibrating piece, a base member for mounting the quartz crystal vibrating piece, and a lid member for sealing the quartz crystal vibrating piece between the base member is known. .

  As such a crystal vibrating piece, for example, a quartz crystal vibrating piece cut out by AT cut is known. In recent years, AT-cut quartz resonators are required to be downsized. For this reason, for example, in the process of forming the outer shape, wet etching with high mass productivity is often employed.

JP2012-65000A

  By the way, when the external shape of the crystal vibrating piece is formed by wet etching, the side surface in the X-axis direction of the crystal vibrating piece has a triangular shape with the center protruding in a cross-sectional view. In this case, when the side electrode is formed on the side surface, the metal wiring is formed along the protruding portion on the side surface, and there is a concern that the metal wiring is disconnected near the apex of the triangle.

  On the other hand, even if the metal wiring is disconnected on the side surface in the X-axis direction, the metal wiring can be formed on the side surface orthogonal to the side surface. However, as the chip becomes smaller, it is expected that the width of the side electrode cannot be ensured because the size of the mounting electrode needs to be reduced according to the size of the chip, and the wiring resistance is expected to increase.

  Further, when the surface base metal is formed by sputtering, the base metal goes around beyond the apex of the triangle. Since the surrounding base metal is thin, it easily diffuses, resulting in poor adhesion at the diffusion portion.

  As described above, there is a possibility that the CI value of the quartz-crystal vibrating piece is increased due to the disconnection of the side electrode and the decrease in adhesion.

  In view of the circumstances as described above, an object of the present invention is to provide a crystal resonator capable of reducing the CI value. It is another object of the present invention to provide an oscillator, an electronic device, and a radio timepiece that include the crystal resonator.

  A crystal resonator according to the present invention is formed in a rectangular plate shape, and includes a crystal resonator element having a first main surface, a second main surface, and four side surfaces, and a package having a base member on which the crystal resonator element is mounted. The quartz crystal resonator element includes a pair of excitation electrodes formed on the first main surface and the second main surface, and a pair of excitation electrodes formed on the first main surface and the second main surface, respectively. A side electrode that connects the mounting electrode connected to the one side, the one mounting electrode formed on the first main surface, and the one mounting electrode formed on the second main surface The side electrode is formed with a triangular projection in a sectional view from the side in contact with the first main surface and the second main surface of the four side surfaces toward the center in the thickness direction. It is provided on a side surface different from the side surface.

  According to the present invention, the side surface electrode is different from the side surface in which the protruding portion having a triangular shape in cross section is formed from the side in contact with the first main surface and the second main surface to the center in the thickness direction among the four side surfaces. Since it is provided on the side surface, it is possible to avoid disconnection of the side electrode and a decrease in adhesion. Thereby, since it becomes possible to reduce the electrical resistance value in a side electrode, CI value can be reduced.

In the above-described crystal resonator, the mounting electrode is formed so that one direction is long and the long side is connected to the side electrode.
According to the present invention, since the mounting electrode is formed so that one direction is long and the long side of the mounting electrode is connected to the side electrode, the electrical resistance value of the side electrode is reduced. Is possible. Thereby, the CI value can be reduced.

In the above-described crystal resonator, the side electrode is provided with a wider side surface on the long side than a side surface on which the protruding portion is formed.
According to the present invention, since the side surface provided with the protrusion is a relatively narrow side surface, the influence of the side electrode formed on the side surface on the electrical resistance can be reduced, and the entire side electrode has a low electrical resistance value. Can be secured.

In the above-described crystal resonator, the side surface on which the side surface electrode is provided among the four side surfaces is formed flat.
According to the present invention, since the side surface on which the side electrode is provided is formed flat among the four side surfaces, an inclined surface can be easily formed with respect to the corner portion of the crystal vibrating piece.

In the above-described crystal resonator, the crystal resonator element includes an AT-cut crystal element, and the crystal element is formed in a longitudinal direction in the Z direction.
According to the present invention, since the crystal vibrating piece has the AT-cut crystal piece and the crystal piece is formed in the longitudinal direction in the Z direction, it is possible to suppress an increase in the electrical resistance value in the side electrode. . Thereby, the CI value can be reduced.

In the oscillator according to the present invention, the crystal resonator according to the present invention is electrically connected to an integrated circuit as an oscillator. Further, in the electronic device according to the present invention, the crystal resonator according to the present invention is electrically connected to the time measuring unit. In the radio-controlled timepiece according to the present invention, the crystal resonator according to the present invention is electrically connected to the filter unit.
According to the oscillator, the electronic device, and the radio timepiece according to the present invention, since the crystal unit is provided, a high-quality product excellent in operation reliability can be obtained.

  According to the present invention, it is possible to provide a crystal resonator capable of reducing the CI value. In addition, an oscillator, an electronic device, and a radio timepiece that are provided with the crystal resonator and have excellent reliability can be provided.

FIG. 3 is an exploded perspective view showing the configuration of the crystal resonator according to the embodiment. FIG. 3 is a cross-sectional view showing a configuration of a crystal resonator according to the embodiment. The top view which shows the structure of the crystal vibrating piece which concerns on this embodiment. It is a figure which shows the cross-sectional structure of the crystal oscillator in FIG. Process drawing which shows the manufacture process of a crystal oscillator. The block diagram which shows one Embodiment of an oscillator. The block diagram which shows one Embodiment of an electronic device. The block diagram which shows one Embodiment of a radio timepiece. The top view which shows the structure of the quartz crystal vibrating piece which concerns on a modification. It is a figure which shows the structure along CC cross section in FIG. It is a figure which shows the structure along the DD cross section in FIG. The top view which shows the structure of the quartz crystal vibrating piece which concerns on a modification. It is a figure which shows the structure along the EE cross section in FIG. It is a figure which shows the structure along the FF cross section in FIG. FIG. 13 is a cross-sectional view illustrating a configuration when the crystal vibrating piece according to FIG. 12 is mounted.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view showing a configuration of a crystal resonator 1 according to the present embodiment. FIG. 2 is a cross-sectional view showing the configuration of the crystal unit 1.
As shown in FIGS. 1 and 2, the crystal resonator 1 according to the present embodiment includes a package 2 having a cavity hermetically sealed therein, and the above-described crystal vibrating piece 3 housed in the cavity. Ceramic package type surface-mount type resonators.

  Hereinafter, the XYZ coordinate system is used when describing the configuration of each figure. In the XYZ coordinate system, the longitudinal direction of the crystal vibrating piece 3 is expressed as the X direction (or length direction), and the direction orthogonal to the Z direction on the main surface of the crystal vibrating piece 3 is expressed as the Z direction (or width direction). To do. A direction perpendicular to the XZ plane is denoted as a Y direction (or thickness direction). In the X direction, the Y direction, and the Z direction, an arrow direction in the drawing is described as a + direction, and a direction opposite to the arrow direction is described as a-direction.

  The package 2 includes a base member (package main body) 10 and a lid member (sealing plate) 20 joined to the base member 10.

  The base member 10 is formed in a rectangular shape and has a bottom part 11 and a side wall part 12. The base member 10 is made of ceramics, for example. Specific examples of the ceramic material include HTCC (High Temperature Co-Fired Ceramic) made of alumina, and LTCC (Low Temperature Co-Fired Ceramic) made of glass ceramic. The base member 10 may be formed of, for example, glass or resin.

  The bottom 11 has a mounting surface 11a on which the crystal vibrating piece 3 is mounted and a bottom surface 11b provided on the opposite side of the mounting surface 11a. The mounting surface 11a is parallel to the XZ plane and is formed flat. The side wall portion 12 is formed in a rectangular ring shape along the outer periphery of the bottom portion 11 and surrounds the central portion of the bottom portion 11. As described above, the base member 10 is configured to have the concave portion 13 formed by the bottom portion 11 and the side wall portion 12.

  A mounting electrode 14 is formed on the mounting surface 11a. The mounting electrode 14 has a first mounting electrode 14a and a second mounting electrode 14b arranged side by side in the Z direction. An external electrode 15 connected to the outside is formed on the bottom surface 11b. One external electrode 15 is disposed at each of the four corners of the bottom surface 11b. Two of the four external electrodes 15 are connected to one of the mounting electrodes 14 (first mounting electrode 14a and second mounting electrode 14b). The mounting electrode 14 and the external electrode 15 are electrically connected by a connection portion 16 formed so as to penetrate the bottom portion 11. The remaining two of the four external electrodes 15 are used as ground electrodes, for example.

  The lid member 20 is disposed on the side wall portion 12 of the base member 10. The lid member 20 is formed in a rectangular plate shape using, for example, the above ceramic material. The lid member 20 is joined to the end surface 12a of the side wall portion 12 by, for example, an adhesive (not shown). By providing the lid member 20 in this way, the recess 13 of the base member 10 is sealed.

  The crystal vibrating piece 3 is formed in a rectangular plate shape and is accommodated in the package 2. The crystal vibrating piece 3 has a crystal piece 31 cut out from an artificial quartz that has been subjected to lumbar processing by AT cut. The AT cut is an angle of 35 ° around the X axis with respect to the Z axis among the three crystal axes of the electric axis (X axis), the mechanical axis (Y axis), and the optical axis (Z axis), which are crystal axes of artificial quartz. This is a processing method of cutting in a direction inclined by 15 ′ (Z′-axis direction). The crystal piece 31 cut out by the AT cut has the advantages that the frequency temperature specification is stable, the structure and shape are simple and easy to process, and the crystal impedance (CI value) is low.

  FIG. 3 is a plan view showing the configuration of the crystal vibrating piece 3. FIG. 4A is a diagram showing a configuration along the section AA in FIG. FIG. 4B is a diagram showing a configuration along the BB cross section in FIG. In FIG. 3, the Z-axis direction in the XYZ coordinate system in the present embodiment coincides with the direction (Z ′ direction) in which the AT-cut crystal piece is cut out. Similarly, the X axis coincides with the electrical axis and the Y axis coincides with the mechanical axis.

As shown in FIGS. 3, 4 (a), and 4 (b), the crystal vibrating piece 3 includes the crystal piece 31, excitation electrodes 32 and 33, routing electrodes 34 and 35, and mounting electrodes 36 to 39. doing.
The crystal piece 31 is formed to a predetermined thickness and has a first main surface 31a and a second main surface 31b. The first main surface 31a and the second main surface 31b are formed in parallel to the XZ plane.

  The excitation electrode 32 is formed at the center of the first main surface 31 a of the crystal piece 31. The excitation electrode 32 is formed in a rectangle when viewed in the Y direction. The excitation electrode 33 is formed at the center of the second main surface 31 b of the crystal piece 31. The excitation electrode 32 is formed in a rectangular shape as viewed in the Y direction and has a size overlapping the excitation electrode 32.

  The routing electrode 34 is formed on the first major surface 31 a and connects the excitation electrode 32 and the mounting electrode 36. The routing electrode 34 is formed in a linear shape so as to extend in the Z direction, for example. The routing electrode 35 is formed on the second main surface 31 b and connects between the excitation electrode 33 and the mounting electrode 39. As with the routing electrode 34, the routing electrode 35 is formed in a linear shape so as to extend in the Z direction, for example.

  The mounting electrode 36 is disposed at a corner on the −X side and the −Z side of the first main surface 31a. The mounting electrode 37 is disposed at a corner of the first main surface 31a on the −X side and the + Z side. The mounting electrode 38 is disposed at a corner on the −X side and the −Z side of the second main surface 31b. The mounting electrode 39 is disposed at a corner on the −X side and the + Z side of the second main surface 31b.

  The mounting electrode 36 and the mounting electrode 38 are connected by a side electrode 40. The side electrode 40 is formed on the side surface 31 c disposed at the end on the −Z side among the four side surfaces of the crystal piece 31. As shown in FIG. 4, the side surface 31c is formed flat. For this reason, the side electrode 40 formed on the side surface 31c is excellent in adhesion and electrical resistivity.

  The mounting electrode 37 and the mounting electrode 39 are connected by a side electrode 41. The side electrode 41 is formed on the side surface 31 d disposed at the end on the + Z side among the four side surfaces of the crystal piece 31. As shown in FIG. 4A, the side surface 31d is formed flat. For this reason, the side electrode 41 formed on the side surface 31d is excellent in adhesion and electrical resistivity.

  On the other hand, of the four side surfaces of the crystal piece 31, projecting portions 31 i and 31 j are formed on the side surface 31 e and the side surface 31 f disposed at the end portion on the −X side and the end portion on the + X side. As shown in FIG. 4B, the projecting portions 31i and 31j project in a triangular shape in sectional view from the end sides of the first main surface 31a and the second main surface 31b to the central portions of the side surface 31e and the side surface 31f. Is formed. The protrusions 31i and 31j are formed along the Z direction.

  In the present embodiment, the side electrodes 40 and 41 are formed on side surfaces 31c and 31d different from the side surfaces 31e and 31f, respectively, so as to avoid the side surfaces 31e and 31f on which the protruding portions 31i and 31j are formed. When electrodes are formed on the protrusions 31 i and 31 j, a break is caused at the apex of the triangle or the adhesion is lowered. Therefore, in the present embodiment, the occurrence of such a break or a decrease in adhesion is avoided. Yes. In order to achieve the same effect, the side electrodes 30, 41 may be formed on the protruding portions 31i, 31j. In this case, the widths L1, L3 of the side electrodes 30, 41 are larger than the widths L2, L4. Largely formed. As a result, only the protrusions that are likely to be affected by disconnection or the like are provided on the smaller widths L2 and L4, so that a desired electrical resistance value can be ensured even if the protrusions are present.

  The mounting electrodes 36 and 38 are formed in a rectangular shape when viewed in the Y direction, and are formed in the longitudinal direction in the X direction. The mounting electrodes 36 and 38 have the long side (dimension L1) side disposed on the side surface 31c and the short side (dimension L2) side disposed on the side surface 31e. Therefore, the dimension in the X direction of the side electrode 40 is a dimension corresponding to the dimension L1 in the long side direction of the mounting electrodes 36 and 38. That is, the dimension in the X direction of the side electrode 40 is equal to the dimension L1 in the long side direction of the mounting electrodes 36 and 38. Thereby, since the width | variety of the side electrode 40 can be earned, an electrical resistance value becomes low.

  Furthermore, the mounting electrodes 37 and 39 are formed in a rectangular shape when viewed in the Y direction, and are formed in the longitudinal direction in the X direction. The mounting electrodes 37 and 39 have the long side (dimension L3) side disposed on the side surface 31d and the short side (dimension L4) side disposed on the side surface 31e. Therefore, the dimension in the X direction of the side electrode 41 is a dimension corresponding to the dimension L1 in the long side direction of the mounting electrodes 37 and 39. That is, the dimension in the X direction of the side electrode 41 is equal to the dimension L3 in the long side direction of the mounting electrodes 37 and 39. Thereby, since the width of the side electrode 41 can be earned, the electrical resistance value is lowered.

  In the present embodiment, inclined portions 31g are formed at corners on the + X side and the + Z side of the first main surface 31a of the crystal piece 31. For example, the inclined portion 31g is an inclined surface formed at an angle of 30 ° with respect to the XZ plane. In addition, an inclined portion 31 h is formed at a corner on the + X side and the −Z side of the second main surface 31 b of the crystal piece 31. The inclined portion 31h is an inclined surface formed at an angle of, for example, 30 ° with respect to the XZ plane. In the present embodiment, the side electrodes 40 and 41 are formed so as to avoid the portions where the inclined portions 31g and 31h are formed.

  As shown in FIG. 2, the crystal vibrating piece 3 is fixed to the base member 10 via a conductive adhesive 50. One conductive adhesive 50 is disposed between the first mounting electrode 14a and the mounting electrode 38 formed on the mounting surface 11a, and between the second mounting electrode 14b and the mounting electrode 39, respectively. . Each conductive adhesive 50 physically fixes and electrically connects between the first mounting electrode 14 a and the mounting electrode 38 and between the second mounting electrode 14 b and the mounting electrode 39. As the conductive adhesive 50, a conductive resin that is cured by heating is used.

Next, a method for manufacturing the crystal resonator 1 configured as described above will be described.
First, a blank of artificial quartz produced by an autoclave or the like is cut with an AT cut surface using, for example, a wire saw or the like to form a quartz wafer W as shown in FIG. Examples of the shape of the quartz wafer W include a disk-shaped configuration, but are not limited thereto, and may be a square plate or the like. Thereafter, lapping polishing is performed on the quartz wafer W to adjust it to a desired thickness and to flatten the surface of the quartz wafer W. At this time, polishing polishing may be performed as necessary.

  Thereafter, a mask pattern is formed on the surface of the quartz wafer W by using a photolithography technique. As the mask pattern, for example, a photosensitive photoresist is used. After the mask pattern is formed, the exposed surface of the crystal is removed by wet etching. In this step, as shown in FIG. 5B, stable crystal planes are formed on the side surfaces and corners of the crystal wafer 31 in the crystal wafer W. At this time, for example, in one pattern of the crystal wafer W, four side surfaces Wc, Wd, We, Wf corresponding to the four side surfaces of the crystal piece 31 are formed. In this case, although the end surfaces of the opposing side surfaces Wc and Wd are formed flat, the opposing side surfaces We and Wf have protrusions Wi and Wj that protrude in a triangular shape in cross-section toward the center in the thickness direction of the end surface. It is formed.

  Next, the excitation electrodes 32 and 33, the routing electrodes 34 and 35, the mounting electrodes 36 to 39, and the side electrodes 40 and 41 are formed on the front surface, the back surface, and the side surface of the quartz wafer W. When these electrodes are formed, first, a ground layer such as Cr is formed by sputtering from the surface side of the quartz wafer W, and then a conductive layer such as Au, Ag, and Al is laminated on the ground layer. After forming the laminated structure on the front surface side, a ground layer such as Cr is similarly formed by sputtering from the back surface side of the crystal wafer W, and thereafter, a conductive layer such as Au, Ag, Al is formed on the ground layer as described above. Laminate. In addition to the sputtering method, an evaporation method or the like may be performed. After forming the laminated structure of the metal film, patterning is performed by, for example, a photolithography method. At this time, the side electrodes 40 and 41 are formed not on the side surfaces We and Wf on which the protruding portions Wi and Wj are formed, but on the side surfaces Wc and Wd different from the side surfaces We and Wf. Alternatively, the side surfaces Wc and Wd are formed wider than the side surfaces We and Wf on which the protruding portions Wi and Wj are formed.

  After forming the electrode, the crystal vibrating piece 3 is formed by solidifying. After the crystal vibrating piece 3 is formed, the crystal vibrating piece 3 is mounted on the base member 10. Thereafter, the resonance frequency of the quartz crystal vibrating piece 3 is adjusted by irradiating the quartz vibrating piece 3 with an Ar ion beam or the like. After adjusting the resonance frequency, the crystal member 1 is completed by disposing the lid member 20 on the end surface 12a of the side wall portion 12 of the base member 10 and sealing the concave portion 13. The pressure inside the package 2 when sealing the recess 13 may be atmospheric pressure or reduced pressure.

  As described above, according to the present embodiment, the side electrodes 40 and 41 have a cross section from the side in contact with the first main surface 31a and the second main surface 31b among the four side surfaces 31c to 31f toward the center in the thickness direction. Since the projections 31i and 31j having a triangular shape are provided on the side surfaces 31c and 31f different from the side surfaces 31e and 31f on which the projections 31i and 31j are formed, the side electrodes 40 and 41 are the projections 31i of the four side surfaces 31c to 31f. The side surfaces 31c and 31f, which are different from the side surfaces 31e and 31f on which the 31j is formed, are wider than the side surfaces 31e and 31f, so that disconnection of the side electrodes 40 and 41 and a decrease in adhesion are avoided. Can do. Thereby, since it becomes possible to reduce the electrical resistance value in the side surface electrodes 40 and 41, CI value can be reduced.

[Oscillator]
Next, an embodiment of an oscillator according to the present invention will be described with reference to FIG.
As shown in FIG. 6, the oscillator 100 according to the present embodiment is configured by configuring the crystal unit 1 as an oscillator electrically connected to the integrated circuit 101. The oscillator 100 includes a substrate 103 on which an electronic component 102 such as a capacitor is mounted. The above-described integrated circuit 101 for the oscillator is mounted on the substrate 103, and the crystal unit 1 is mounted in the vicinity of the integrated circuit 101. The electronic component 102, the integrated circuit 101, and the crystal unit 1 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 crystal resonator 1, the crystal vibrating piece 3 in the crystal resonator 1 vibrates. This vibration is converted into an electric signal by the piezoelectric characteristics of the crystal vibrating piece 3 and input to the integrated circuit 101 as an electric signal. The input electrical signal is subjected to various processes by the integrated circuit 101 and is output as a frequency signal. Thereby, the crystal unit 1 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, since the high-quality crystal resonator 1 having excellent vibration characteristics is provided, high quality with excellent reliability and high accuracy that is stable over a long period of time. An oscillator 100 that can obtain a frequency signal can be provided.

[Electronics]
Next, an embodiment of an electronic device according to the present invention will be described with reference to FIG. Note that a portable information device 110 having the above-described crystal resonator 1 will be described as an example of the electronic device.

  First, the portable information device 110 of the present 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 110 of this embodiment will be described. As shown in FIG. 7, the portable information device 110 includes a crystal resonator 1 and a power supply unit 111 for supplying power. The power supply unit 111 is made 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 clock unit 113 includes an integrated circuit including an oscillation circuit, a register circuit, a counter circuit, an interface circuit, and the like, and the crystal unit 1. When a voltage is applied to the crystal resonator 1, the crystal vibrating piece 3 vibrates, and this vibration is converted into an electric signal by the piezoelectric characteristics of the crystal and is 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.

  In addition, the function of the communication part 114 can be stopped more reliably by providing the power supply cutoff part 126 that can selectively cut off the power of the part related to the function of the communication part 114.

  As described above, according to the portable information device 110 of the present embodiment, since the high-quality crystal unit 1 having excellent vibration characteristics is provided, the high quality that is excellent in reliability and the high stability that is stable over a long period of time. The portable information device 110 that can display accurate clock information can be provided.

[Radio clock]
Next, an embodiment of a radio timepiece according to the present invention will be described with reference to FIG.
As shown in FIG. 8, the radio timepiece 130 of the present embodiment includes the crystal unit 1 electrically connected to the 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 and 60 kHz have both the property of propagating the ground surface 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 transmitters cover all of Japan. doing.

  Hereinafter, the functional configuration of the radio timepiece 130 will be described in detail.

  The antenna 132 receives a long standard radio wave of 40 kHz or 60 kHz. The long standard radio wave is obtained by subjecting time information called a time code to AM modulation on a carrier of 40 kHz or 60 kHz. The received long standard radio wave is amplified by the amplifier 133 and filtered and tuned by the filter unit 131 having the plurality of crystal units 1.

  The crystal unit 1 in this embodiment includes crystal units 138 and 139 having resonance frequencies of 40 kHz and 60 kHz that are the same as the carrier frequency described above.

  Further, the filtered signal having a predetermined frequency is detected and demodulated by the detection and rectification circuit 134. Subsequently, the time code is taken out via the waveform shaping circuit 135 and counted by the CPU 136. The CPU 136 reads information such as the current year, accumulated date, day of the week, and time. The read information is reflected in the RTC 137, and accurate time information is displayed.

  Since the carrier wave is 40 kHz or 60 kHz, the crystal resonator units 138 and 139 are preferably resonators 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, a standard radio wave of 77.5 KHZ is used in Germany. Therefore, when the radio timepiece 130 that can be handled overseas is incorporated in a portable device, the crystal resonator 1 having a frequency different from that in Japan is required.

  As described above, according to the radio-controlled timepiece 130 of the present embodiment, since the high-quality quartz crystal unit 1 having excellent vibration characteristics is provided, the high-quality crystal unit having excellent reliability and stable over a long period of time. It is possible to provide a radio timepiece 130 that can count time with high accuracy.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the configuration in which the crystal piece 31 constituting the crystal vibrating piece 3 is long in the X direction has been described as an example, but the present invention is not limited to this.

FIG. 9 is a plan view showing another configuration of the crystal vibrating piece 3. FIG. 10 is a diagram showing a configuration along a CC cross section in FIG. 9. FIG. 11 is a diagram illustrating a configuration along a DD cross section in FIG. 9.
As shown in FIGS. 9, 10 and 11, in the crystal vibrating piece 3A, the crystal piece 31 is elongated in the Z direction.

  In this configuration, the side electrode 40 that connects between the mounting electrode 36 and the mounting electrode 38 is formed on the side surface 31 c disposed at the end on the −Z side among the four side surfaces of the crystal piece 31. Similarly, the side electrode 41 connecting the mounting electrode 37 and the mounting electrode 39 is also formed on the side surface 31c.

  As shown in FIG. 10, the side surface 31c is formed flat by performing wet etching. For this reason, the side electrodes 40 and 41 formed on the side surface 31c are excellent in adhesion and electrical resistivity. In the first main surface 31a, inclined portions 31h are formed at corners on the + X side and −Z side, and on the second main surface 31b, inclined portions 31g are formed at corner portions on the + X side and + Z side.

  On the other hand, protrusions 31i and 31j are formed on the side surface 31e and the side surface 31f arranged at the −X side end portion and the + X side end portion among the four side surfaces of the crystal piece 31 by wet etching. As shown in FIG. 11, the projecting portions 31i and 31j are formed so as to project in a triangular shape in cross section from the end sides of the first main surface 31a and the second main surface 31b to the central portions of the side surface 31e and the side surface 31f. Yes. For this reason, a disconnection and adhesive fall can be avoided.

  In this configuration, the side electrodes 40 and 41 are respectively formed on side surfaces 31c different from the side surfaces 31e and 31f on which the protruding portions 31i and 31j are formed. The mounting electrodes 36 and 38 are formed in a rectangular shape when viewed in the Y direction, and are formed in the longitudinal direction in the X direction. The mounting electrodes 36 and 38 have the long side disposed on the side surface 31c and the short side disposed on the side surface 31f. Thereby, since the width | variety of the side electrode 40 can be earned, an electrical resistance value becomes low. The side electrodes 40 and 41 are also provided on the side surfaces 31e and 31f on which the projecting portions 31i and 31j are formed, and even if the side surfaces 31c and 31f are wider than the side surfaces 31e and 31f, the electricity is similarly applied. Conductivity with a low resistance value can be ensured.

  Furthermore, the mounting electrodes 37 and 39 are formed in a rectangular shape when viewed in the Y direction, and are formed in the longitudinal direction in the X direction. The mounting electrodes 37 and 39 have a long side disposed on the side surface 31c and a short side disposed on the side surface 31e. Thereby, since the width of the side electrode 41 can be earned, the electrical resistance value is lowered.

  Further, in this configuration, since the second main surface 31b in which the inclined portion is not formed in the mounting portion is opposed to the mounting surface 11a, not the first main surface 31a in which the inclined portion 31h is formed in the mounting portion, it is favorable. Implementation can be secured.

FIG. 12 is a plan view showing another configuration of the crystal vibrating piece 3. FIG. 13 is a diagram showing a configuration along the section EE in FIG. FIG. 14 is a diagram showing a configuration along the section FF in FIG.
As shown in FIGS. 12, 13, and 14, in the quartz crystal vibrating piece 3 </ b> B, the quartz piece 31 is long in the Z direction, and the mounting electrodes 36 to 39 are formed along the corners. ing. Even in this case, conduction between the first main surface 31a side and the second main surface 31b side can be achieved by the side surface electrodes 40 and 41. In this case, as shown in FIG. 15, the conductive adhesive 50 is disposed so as to cover the side electrode 40, whereby a configuration with more excellent conductivity can be obtained. Although illustration is omitted, the same explanation can be made on the side electrode 41 side.

  For example, in the above-described embodiment, the ceramic package type crystal resonator 1 is described as an example. However, the present invention is not limited to this, and a glass package type crystal resonator may be used. In addition, a cylinder package type crystal resonator or a cylinder package type crystal resonator may be further solidified with a mold resin portion to form a surface mount type crystal resonator.

W ... Quartz wafer 1 ... Quartz crystal resonator 2 ... Package 3 ... Quartz crystal vibrating piece 31 ... Quartz piece 31a ... First main surface 31b ... Second main surface 31c-31f ... Side surface 31i, 31j ... Projection part 31g, 31h ... Inclined part 32, 33 ... Excitation electrodes 36-39 ... Mounted electrodes 40, 41 ... Side electrodes 41 ... Side electrodes 50 ... Conductive adhesive 100 ... Oscillator 110 ... Portable information equipment 130 ... Radio clock

Claims (8)

A quartz crystal vibrating piece formed in a rectangular plate shape and having a first main surface, a second main surface and four side surfaces;
A package having a base member on which the crystal resonator element is mounted,
The crystal vibrating piece is
Excitation electrodes respectively formed on the first main surface and the second main surface;
A pair of electrodes formed on each of the first main surface and the second main surface and connected to the excitation electrode; and
A side electrode connecting the one mounting electrode formed on the first main surface and the one mounting electrode formed on the second main surface;
The side electrode is different from the side surface in which a protruding portion having a triangular shape in cross section is formed from the side in contact with the first main surface and the second main surface to the center in the thickness direction among the four side surfaces. A crystal unit on the side. The quartz resonator according to claim 1, wherein the mounting electrode is formed such that one direction is formed in a longitudinal direction and a long side is connected to the side electrode. The crystal unit according to claim 1, wherein the side electrode has a side surface on the long side that is wider than a side surface on which the protruding portion is formed. The crystal unit according to any one of claims 1 to 3, wherein the side surface on which the side surface electrode is provided among the four side surfaces is formed flat. The crystal vibrating piece has an AT-cut crystal piece,
The crystal unit according to any one of claims 1 to 4, wherein the crystal piece is formed longitudinally in the Z 'direction. An oscillator in which the crystal resonator according to claim 1 is electrically connected to an integrated circuit as an oscillator. An electronic device in which the crystal unit according to claim 1 is electrically connected to a time measuring unit. A radio-controlled timepiece in which the crystal unit according to claim 1 is electrically connected to a filter unit.

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