JP2012151823A - Surface-mounted crystal oscillator and substrate sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface-mounted crystal oscillator and a substrate sheet, capable of properly performing frequency adjustment and inspection of a sheet pattern.SOLUTION: A mounting terminal 4a and a mounting terminal 4b are formed, parallel to the minor side of a substrate 1, at both ends of the substrate 1, on the rear surface of the substrate 1. One corner close to a corner terminal 4c of the mounting terminal 4a is connected to the corner terminal. The other corner close to the corner terminal 4c of the mounting terminal 4a is separated by a division part containing a specified gap L, to be not connected to the corner terminal. A corner close to the corner terminal 4c of the mounting terminal 4b is connected to the corner terminal. The other corner close to the corner terminal 4c of the mounting terminal 4b is separated by the division part containing the specified gap L, to be not connected to the corner terminal.

Description

  The present invention relates to a surface-mount crystal resonator, and more particularly, to a surface-mount crystal resonator and a substrate sheet that can appropriately perform frequency adjustment and inspection on a sheet-like substrate sheet.

[Conventional technology]
Since the surface-mounted crystal unit is small and light, it is built in as a frequency and time reference source, especially in portable electronic devices.
Some conventional surface-mount crystal units have a crystal piece mounted on a ceramic substrate, and are covered with a concave cover upside down and hermetically sealed. In recent years, the frequency deviation Δf / f is relatively loose, and there is an inexpensive consumer use of ± 150 to ± 250 ppm, for example.

[Conventional mounting terminal: Fig. 7]
In the conventional surface mount crystal resonator, in the structure in which the front and back sides of the substrate are electrically connected at the corner through-hole portion, the pattern of the mounting terminals on the back surface is shown in FIG. FIG. 7 is an explanatory plan view showing a pattern of conventional mounting terminals.
As shown in FIG. 7, a corner terminal 4c connected to a through terminal formed in a through hole and a mounting terminal 4 'connected to two corner terminals 4c are provided on the back surface of the substrate in a conventional surface mount crystal resonator. Is formed.
The mounting terminal 4 ′ is formed in a rectangular shape along the short side of the substrate, and two corners are connected to the corner terminal 4c.

[Conventional sheet pattern: FIG. 8]
The mounting terminals on the back surface of the substrate shown in FIG. 7 show the case of one surface-mounted crystal resonator, but the substrate sheet before being divided individually is as shown in FIG. FIG. 8 is an explanatory plan view showing a conventional sheet pattern.
As shown in FIG. 8, in the conventional substrate sheet pattern (sheet pattern), a corner terminal 4c is formed so as to surround one through terminal, and four mounting terminals 4 'are connected to the corner terminal 4c. . In FIG. 8, mounting terminals 4 'are connected in parallel in the vertical direction.

[Related technologies]
As related prior art, JP 2009-147849 A “Piezoelectric Vibrating Element Manufacturing Method, Piezoelectric Substrate Wafer and Piezoelectric Vibrator” (Epson Toyocom Corporation) [Patent Document 1], JP 2004-214921 A There are “insulating packages, piezoelectric devices, package fixing structures, mobile phone devices using piezoelectric devices, and electronic devices using piezoelectric devices” (Seiko Epson Corporation) [Patent Document 2].

In Patent Document 1, external connection terminals (mounting terminals) formed on the back surface of a piezoelectric vibration element substrate are connected to terminals formed on two through-hole sidewalls on a quartz crystal wafer.
That is, the mounting terminal has a two-terminal structure in one piezoelectric vibration element, and has a structure similar to the structure shown in FIGS.

  In Patent Document 2, two mounting electrode portions formed on the bottom surface of the piezoelectric device are formed (two-terminal structure) and connected to metal coating portions formed at four corners and side walls. Note that Patent Document 2 also shows a four-terminal structure.

JP 2009-147849 A Japanese Patent Laid-Open No. 2004-214921

  However, in the sheet pattern of the above conventional surface mount crystal resonator, when frequency adjustment work or electrical inspection (electrical inspection) is performed in the state of the substrate sheet, there is a risk of oscillation due to mounting terminals connected in parallel in the sheet longitudinal direction. There was a problem that normal assembly inspection could not be performed.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a surface-mounted crystal resonator and a substrate sheet that can appropriately perform frequency adjustment and inspection in a sheet pattern.

  The present invention for solving the problems of the above conventional example, in the surface-mounted crystal resonator, through holes are formed at the four corners of the substrate on which the crystal piece is mounted, and through terminals for conducting the through hole inner surface are formed, A corner terminal connected to the through terminal is formed on the substrate opposite to the surface on which the crystal piece is mounted, and the first mounting terminal and the second mounting are formed at both ends of the substrate in parallel with the short side of the substrate. A terminal is formed, one corner near the corner terminal of the first mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the first mounting terminal is connected by a dividing portion having a specific interval. It is divided without connecting to the corner terminal, one corner near the corner terminal of the second mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the second mounting terminal is a specific corner terminal. Minute with interval The said corner terminal characterized in that it is divided not connect the parts.

  According to the present invention, in the surface-mounted crystal resonator, the corner terminal to which the first mounting terminal is connected and the corner terminal to which the second mounting terminal is connected are diagonal on the substrate.

  The present invention is characterized in that, in the surface mount crystal resonator, the specific interval at the dividing portion is 0.1 to 0.2 mm.

  According to the present invention, in the surface-mounted crystal resonator, corner terminals are formed at four corners of a substrate surface on which a crystal piece is mounted, and the first crystal holding terminal is connected to another short side in parallel with the short side on the substrate surface. In parallel, a second crystal holding terminal is formed, and the first crystal holding terminal is connected to a first mounting terminal formed on the opposite surface of the substrate to a specific corner terminal in the corner terminal. Connect the second crystal holding terminal to a corner terminal different from the specific corner terminal in the corner terminal so that the second crystal holding terminal is connected to the second mounting terminal formed on the opposite surface of the substrate. Features.

  According to the present invention, in the above surface-mounted crystal resonator, the side where the first crystal holding terminal is not connected to the corner terminal is shortened, and the side where the second crystal holding terminal is not connected to the corner terminal is shortened. It is characterized by that.

  The present invention relates to a sheet-like substrate sheet on which a plurality of surface-mounted crystal resonators are formed. The substrate sheet includes break lines and breaks that divide individual surface-mount crystal resonator regions in a vertical direction and a horizontal direction. Through-holes that penetrate the sheet are formed at the intersections of the lines, through-terminals that connect the inner surface of the through-holes are formed, corner terminals are formed so as to surround the through-holes, and each of the short sides in the region In parallel, the first mounting terminal and the second mounting terminal are formed, and one corner near the corner terminal of the first mounting terminal is connected to the corner terminal and is close to the corner terminal of the first mounting terminal. The other corner is divided without being connected to the corner terminal by a dividing portion having a specific interval, and one corner near the corner terminal of the second mounting terminal is connected to the corner terminal. , Other corner portion closer to the corner terminals of the second mounting terminal is on the corner pin by dividing portion having a specific interval, characterized in that it is divided not connect.

  The present invention is characterized in that, in the substrate sheet, the corner terminal connected to the first mounting terminal and the corner terminal connected to the second mounting terminal are diagonal in the region.

  The present invention relates to a method for manufacturing a sheet-like substrate sheet in which a plurality of surface-mounted crystal resonators are formed, and a break line that divides regions of individual surface-mount crystal resonators in a vertical direction and a horizontal direction on the substrate sheet And through-holes that penetrate the sheet at the intersections of the break line, through terminals that conduct through the inner surface of the through-holes by printing or electroless plating, metal patterns of corner terminals that surround the through-holes, and regions The metal pattern of the first mounting terminal and the second mounting terminal is formed in parallel with each of the short sides, and the metal pattern of the first mounting terminal Connected to the corner terminal, the other corner near the corner terminal is divided without being connected to the corner terminal by a dividing portion having a specific interval. The metal pattern of the terminal was divided without being connected to the corner terminal by a dividing portion having a specific interval at one corner portion close to the corner terminal connected to the corner terminal and the other corner portion close to the corner terminal. It is characterized by being.

  The present invention is characterized in that, in the method for manufacturing a substrate sheet, the corner terminal to which the first mounting terminal is connected and the corner terminal to which the second mounting terminal is connected are diagonal in the region. To do.

  According to the present invention, through holes are formed at the four corners of the substrate on which the crystal piece is mounted, through terminals are formed for conducting the inner surface of the through hole, and the surface on the surface opposite to the surface on which the crystal piece is mounted is formed. In addition, a corner terminal connected to the through terminal is formed, and a first mounting terminal and a second mounting terminal are formed at both ends of the substrate in parallel with the short side of the substrate, and the first mounting terminal is close to the corner terminal of the first mounting terminal. Is connected to the corner terminal, and the other mounting portion of the first mounting terminal that is close to the corner terminal is divided by the dividing portion having a specific interval without being connected to the corner terminal. One corner near the corner terminal of the second mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the second mounting terminal is divided without being connected to the corner terminal by a dividing portion having a specific interval. ing Since the surface mounting crystal oscillator, since the mounting terminal in the substrate sheet before being divided into individual are electrically separated, there is an effect that it is possible to perform the frequency adjustment, the electrical inspection successfully.

  According to the present invention, the break line that divides the region of each surface-mounted crystal resonator in the vertical direction and the horizontal direction and the through hole that penetrates the sheet are formed at the intersection of the break line, and the inner surface of the through hole is made conductive. A through terminal is formed, a corner terminal is formed so as to surround the through hole, and a first mounting terminal and a second mounting terminal are formed in parallel with each of the short sides in the region. One corner near the corner terminal of the first mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the first mounting terminal is divided without being connected to the corner terminal by a dividing portion having a specific interval. The one corner near the corner terminal of the second mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the second mounting terminal is a dividing part having a specific interval. Ri since the said corner terminal is set to the substrate sheet is divided without connection, there is an effect that can be performed normally frequency adjustment, the electrical inspection of the substrate sheet.

It is plane explanatory drawing which shows the pattern of the mounting terminal of the surface mount crystal resonator which concerns on embodiment of this invention. It is a plane explanatory view showing a both-ends type pattern. It is a plane explanatory view showing a cantilever type pattern. FIG. 6 is a cross-sectional explanatory diagram of the present vibrator. It is a plane explanatory view of this vibrator. It is a plane explanatory view showing a sheet pattern concerning this embodiment. It is plane explanatory drawing which shows the pattern of the conventional mounting terminal. It is a plane explanatory view showing a conventional sheet pattern.

Embodiments of the present invention will be described with reference to the drawings.
[Outline of the embodiment]
The surface-mounted crystal resonator according to the embodiment of the present invention has a first mounting terminal and a second mounting terminal formed on both ends of the substrate in parallel with the short side of the substrate on the back surface of the substrate. One corner near the corner terminal of the terminal is connected to the corner terminal, and the other corner near the corner terminal of the first mounting terminal is divided without being connected to the corner terminal by a dividing portion having a specific interval. One corner near the corner terminal of the second mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the second mounting terminal is connected to the corner terminal by a dividing portion having a specific interval. Since the mounting terminals are electrically divided in the substrate sheet before being divided individually, frequency adjustment and electrical inspection can be performed normally.

The crystal resonator mounting terminals are roughly classified into two types: four terminals and two terminals. Currently, 4 terminals are the mainstream, but if the customer wants to improve mounting reliability and mounting strength, a 2-terminal product is required.
The surface-mounted crystal resonator according to this embodiment is a two-terminal product, and can perform frequency adjustment and electrical inspection normally, thereby improving productivity.

[Mounting terminal of embodiment: FIG. 1]
The mounting terminal pattern of the surface-mounted crystal resonator according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory plan view showing a pattern of mounting terminals of a surface-mounted crystal resonator according to an embodiment of the present invention.
As shown in FIG. 1, the pattern formed on the back surface of the surface mount crystal resonator (main resonator) according to the embodiment of the present invention is a corner terminal connected to through terminals 2c formed at the four corners of the substrate. 4c is provided, and two mounting terminals 4a and 4b are formed in parallel to the short side of the substrate.

  The mounting terminals 4a and 4b are connected to one corner terminal 4c, but are not connected to the other corner terminal 4c by a dividing portion L having a specific distance from the other corner terminal.

In FIG. 1, the upper left corner terminal 4c and the mounting terminal 4a are connected, and the lower left corner terminal 4c is not connected to the mounting terminal 4a.
Further, the lower right corner terminal 4c and the mounting terminal 4b in FIG. 1 are connected, and the upper right corner terminal 4c is not connected to the mounting terminal 4b.

That is, in one of the vibrators, when one mounting terminal 4a is connected to one corner terminal 4c of the substrate, the other mounting terminal 4b is connected to a corner terminal 4c on a diagonal line on the substrate.
In this case, when one mounting terminal 4a is not connected to one corner terminal 4c, the other mounting terminal 4b is not connected to the corner terminal 4c on the diagonal line on the substrate.

  The dividing portion L in which the mounting terminal and the corner terminal are not connected has an interval (distance) of 0. 0 from the viewpoint of preventing a short circuit due to pattern printing misalignment, securing a mounting area, and suppressing rotation during mounting due to self-alignment. It is desirable to be about 1 to 0.2 mm.

In other words, by setting the interval between the divided portions L to be about 0.1 to 0.2 mm, there is no erroneous connection due to misalignment of pattern printing. Further, when the crystal resonator is mounted, the divided portions L are mounted with mounting solder. The mounting terminals 4a and the corner terminals 4c can be easily connected.
This is the state of the substrate sheet before being divided into individual substrates 1, and the frequency adjustment and inspection can be appropriately performed by the dividing portion L. After being divided into the individual substrates 1, they are mounted on the dividing portion L. The mounting terminals 4a and the corner terminals 4c that have been divided by soldering can be easily connected.

[Both-support type, Cantilever type]
Next, the pattern on the surface (surface on which the crystal resonator is mounted) of the present resonator will be described with reference to FIGS. FIG. 2 is an explanatory plan view showing a both-end supported pattern, and FIG. 3 is an explanatory plan view showing a cantilever-type pattern.
[Both-end type: Fig. 2]
As shown in FIG. 2, the both-end holding type has corner terminals 2a and 2b connected to the through terminals 2c at the four corners of the substrate, and two crystal holding terminals 3 are formed in parallel on the short side of the substrate. A corner terminal 2 a is connected to the terminal 3.

The corner terminal 2 a has a pattern extended to the end of the crystal holding terminal 3 in order to connect to the crystal holding terminal 3.
The corner terminals 2a are formed diagonally on the substrate, and the corner terminals 2b are formed diagonally on the substrate.

The corner terminal 2a to which the crystal holding terminal 3 is connected on the surface of the substrate is connected to the corner terminal 4c on the back surface of the substrate through the through terminal 2c, and further connected to the mounting terminals 4a and 4b.
Further, the corner terminal 2b on the substrate surface is connected to the corner terminal 4c on the back surface of the substrate through the through terminal 2c, but is not connected to the mounting terminals 4a and 4b.

[Cantilever type: Fig. 3]
In the cantilever type, as shown in FIG. 3, corner terminals 2a, 2a ′, 2b connected to the through terminals 2c are formed at the four corners of the substrate, and crystal holding terminals 3a1, 3a2 are provided in parallel with one short side of the substrate. The crystal holding terminal 3b is formed on the other short side of the substrate, the corner terminal 2a 'is connected to the crystal holding terminal 3a1, the corner terminal 2a is connected to the crystal holding terminal 3a2, and the corner terminal is formed. 2b is not connected to the crystal holding terminal.

The corner terminal 2a is extended to the end of the crystal holding terminal 3a2 for connection to the crystal holding terminal 3a2, and the corner terminal 2a 'is connected to the crystal holding terminal 3a1 so that the pattern is connected to the crystal holding terminal 3a1. It is extended long to the end.
The corner terminal 2a and the corner terminal 2a ′ are formed diagonally on the substrate, and the corner terminal 2b is formed diagonally on the substrate.

The corner terminals 2a 'and 2a to which the crystal holding terminals 3a1 and 3a2 are connected on the surface of the substrate are connected to the corner terminals 4c on the back surface of the substrate through the through terminals 2c and further connected to the mounting terminals 4a and 4b. Yes.
Further, the corner terminal 2b on the substrate surface is connected to the corner terminal 4c on the back surface of the substrate through the through terminal 2c, but is not connected to the mounting terminals 4a and 4b.

[Configuration of the vibrator: FIG. 4]
Next, the configuration of the vibrator will be described with reference to FIG. FIG. 4 is an explanatory cross-sectional view of the present vibrator.
As shown in FIG. 4, this vibrator has a crystal piece 5 mounted on a crystal holding terminal 3 formed on a ceramic base (substrate) 1 via a conductive adhesive 7, and a concave metal cover (cover). ) 6 is turned upside down and bonded onto the ceramic base 1 and hermetically sealed.

A through terminal 2c is formed on the side surface of the substrate 1, corner terminals 2a and 2b are connected to the through terminal 2c on the surface of the substrate 1, and a corner terminal 4c is connected to the through terminal 2c on the back surface of the substrate 1. Yes.
The corner terminal 2 a is connected to the crystal holding terminal 3 formed on the surface of the substrate 1, and the corner terminal 4 c is connected to the mounting terminal 4 formed on the back surface of the substrate 1.
The through terminals 2 c are formed on the side walls of through holes (through holes) formed in the four corners of the substrate 1.
Further, an insulating sealing material 8 is formed between the contact portion of the substrate 1 and the cover 6.
The corner terminal, the through terminal, and the mounting terminal are formed of an Ag (silver) Pd (palladium) alloy.

[Planar characteristics of this vibrator: Fig. 5]
Next, planar features of the present vibrator will be described with reference to FIG. FIG. 5 is an explanatory plan view of the vibrator.
As shown in FIG. 5, this vibrator is formed with a crystal holding terminal 3 for holding both ends of a crystal piece 5 on a ceramic base (substrate) 1 so as to face each other. A corner terminal 2a having a lead pattern drawn toward the corner of the substrate 1 is formed and connected to the through terminal 2c.
That is, the two corner terminals 2a are formed diagonally on the substrate 1 and connected to the through terminals 2c. The two corner terminals 2b are also formed diagonally on the substrate 1 and connected to the through terminals 2c.

  The connection to the through terminal 2c through the corner terminal 2a provided with the extraction pattern at the corner of the substrate 1 can take a distance compared to the case where the extraction pattern is drawn out in the horizontal direction or the vertical direction of the substrate 1, Therefore, even if the position of the metal cover 6 is shifted, the crystal holding terminal 3 and the through terminal 2 c are prevented from being short-circuited through the metal cover 3.

The crystal piece 5 and the crystal holding terminal 3 are connected by the conductive adhesive 7 at the end of the crystal holding terminal 3 to which the lead pattern of the corner terminal 2a is connected.
As shown in FIG. 5, since the crystal holding terminal 3 holds the crystal piece 5 at both ends of the crystal piece 5, it is called “both-end” type.

As shown in FIG. 5, the pattern of the crystal holding terminal 3 is formed so as to face the center of the substrate 1, and the end portion to which the corner terminal 2a is not connected has a specific length compared to the conventional crystal holding terminal. Only shortened.
The conventional crystal holding terminal is formed to have the same length from the center of the short side of the substrate 1, but in this vibrator, the length of the crystal holding terminal 3 on the side not connected to the corner terminal 2a is shortened. .
This is for avoiding a short circuit by preventing the metal cover 6 from contacting the other crystal holding terminal 3 even if it contacts one crystal holding terminal 3.

[This sheet pattern: FIG. 6]
The mounting terminals on the back surface of the substrate shown in FIG. 1 show the case of one surface-mounted crystal resonator, but the substrate sheet before being divided individually is as shown in FIG. FIG. 6 is an explanatory plan view showing a sheet pattern according to the present embodiment.
In the substrate sheet pattern (sheet pattern) according to the present embodiment, as shown in FIG. 6, a corner terminal 4c is formed so as to surround one through terminal, and two mounting terminals 4 are connected to the corner terminal 4c. Has been. In FIG. 6, each vibrator is electrically separated.
Therefore, even if frequency adjustment or electrical inspection is performed on the substrate sheet, oscillation does not occur and there is an effect that the frequency adjustment or electrical inspection can be performed normally.

[Manufacturing method of substrate sheet]
Next, a method for manufacturing a substrate sheet will be described.
The substrate sheet before being divided into the individual substrates 1 is formed of ceramic, and break lines and through holes (through holes) for dividing the ceramic sheets into the individual substrates 1 are formed.
The break line delimits the area of the adjacent substrate 1 and makes it easy to divide the manufactured surface-mounted crystal resonator.
The through holes are formed at locations where the break lines intersect (four corners [corner portions] of the substrate 1).

Then, on the back surface of the substrate sheet, a pattern of corner terminals 4c and mounting terminals 4a and 4b is formed around the through hole by printing using a mask pattern. In FIG. 6, the corner terminal 4c is formed in a donut shape so as to surround the through hole.
The pattern of the corner terminals 4c and the mounting terminals 4a and 4b is formed by printing a metal paste of AgPd alloy with a thickness of about 10 μm and then firing. When this pattern is formed, the through terminal 2c in the through hole is also formed from the back side.
The connection relationship between the corner terminal 4c and the mounting terminals 4a and 4b is as described with reference to FIG.

  On the surface of the substrate sheet, patterns of corner terminals 2a and 2b and crystal holding terminals 3 are formed around the through holes. The pattern on the front surface is also formed by the same method as the pattern on the back surface. And when forming this pattern, the through terminal 2c in a through hole is also formed from the surface side.

The pattern on the substrate sheet is formed by printing, but may be formed by electroless plating.
After pattern formation on the front and back surfaces of the substrate sheet, an insulating film is formed, a crystal piece is mounted, frequency adjustment is performed, sealing is performed with a metal cover, and individual surface-mount crystal resonators along break lines Divide into

Specifically, the frequency adjustment is performed by bringing a measurement terminal (probe) from a measuring instrument into contact with the mounting terminals 4a and 4b electrically connected to each crystal piece 2 on the back surface of the substrate sheet. Then, the excitation electrode on the surface side of the crystal piece 5 with the exposed plate surface is irradiated with gas ions to scrape the surface, and the mass of the excitation electrode is reduced to adjust the vibration frequency from the lower to the higher.
However, it is also possible to adjust the vibration frequency from higher to lower by adding a metal film on the excitation electrode by vapor deposition or sputtering, for example.

[Effect of the embodiment]
According to this vibrator, the mounting terminal 4a and the mounting terminal 4b are formed at both ends of the substrate 1 in parallel with the short side of the substrate 1 on the back surface of the substrate 1, and one corner near the corner terminal 4c of the mounting terminal 4a. Is connected to the corner terminal, and the other corner portion of the mounting terminal 4a close to the corner terminal 4c is divided without being connected to the corner terminal by a dividing portion having a specific interval L, and is connected to the corner terminal 4c of the mounting terminal 4b. A surface-mounted crystal in which one corner is connected to the corner terminal, and the other corner near the corner terminal 4c of the mounting terminal 4b is divided without being connected to the corner terminal by a dividing portion having a specific interval L. Since the vibrator is used, since the mounting terminals are electrically separated in the substrate sheet before being divided individually, there is an effect that the frequency adjustment and the electrical inspection can be normally performed.

  The present invention is suitable for a surface-mounted crystal resonator and a substrate sheet that can appropriately perform frequency adjustment and inspection in a sheet pattern.

  1 ... PCB, 2a, 2b ... Corner terminal, 2c ... Through terminal, 3 ... Crystal holding terminal, 4a, 4b ... Mounting terminal, 4c ... Corner terminal, 5 ... Crystal piece, 6 ... metal cover, 7 ... conductive adhesive, 8 ... sealing material

Claims (9)

In surface mount crystal units,
Through holes are formed at the four corners of the substrate on which the crystal piece is mounted,
A through terminal is formed for conducting the inner surface of the through hole,
A corner terminal connected to the through terminal is formed on the substrate on the surface opposite to the surface on which the crystal piece is mounted,
A first mounting terminal and a second mounting terminal are formed at both ends of the substrate in parallel with the short side of the substrate,
One corner near the corner terminal of the first mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the first mounting terminal is connected to the corner terminal by a dividing portion having a specific interval. Is disconnected without being connected to
One corner near the corner terminal of the second mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the second mounting terminal is connected to the corner terminal by a dividing portion having a specific interval. A surface-mount crystal unit characterized by being disconnected without being connected to the surface.   2. The surface mount crystal resonator according to claim 1, wherein the corner terminal to which the first mounting terminal is connected and the corner terminal to which the second mounting terminal is connected are diagonally arranged on the substrate.   3. The surface-mount crystal resonator according to claim 1, wherein the specific interval at the dividing portion is 0.1 to 0.2 mm.   Corner terminals are formed at the four corners of the substrate surface on which the crystal piece is mounted, a first crystal holding terminal is formed in parallel with the short side, and a second crystal holding terminal is formed in parallel with another short side on the substrate surface. The first crystal holding terminal is connected to a specific corner terminal in the corner terminal so as to be connected to a first mounting terminal formed on the opposite surface of the substrate, and the second crystal holding terminal 2. The device according to claim 1, wherein the corner terminal is connected to a corner terminal different from the specific corner terminal so as to be connected to a second mounting terminal formed on an opposite surface of the substrate. 4. The surface mount crystal resonator according to any one of 3 above.   5. The surface according to claim 4, wherein the first crystal holding terminal has a shorter side not connected to the corner terminal, and the second crystal holding terminal has a shorter side not connected to the corner terminal. Mounting crystal unit. A sheet-like substrate sheet on which a plurality of surface-mount crystal units are formed,
In the substrate sheet, a break line that divides an area of each surface-mount crystal resonator in a vertical direction and a horizontal direction and a through hole that penetrates the sheet at a position where the break line intersects are formed,
A through terminal for conducting the inner surface of the through hole is formed, a corner terminal is formed so as to surround the through hole, and a first mounting terminal and a second mounting terminal are provided in parallel with each of the short sides in the region. Formed,
One corner near the corner terminal of the first mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the first mounting terminal is connected to the corner terminal by a dividing portion having a specific interval. Is disconnected without being connected to
One corner near the corner terminal of the second mounting terminal is connected to the corner terminal, and the other corner near the corner terminal of the second mounting terminal is connected to the corner terminal by a dividing portion having a specific interval. A substrate sheet characterized by being divided without being connected to the substrate.   The board sheet according to claim 6, wherein the corner terminal to which the first mounting terminal is connected and the corner terminal to which the second mounting terminal is connected are diagonal in the region. A method for producing a sheet-like substrate sheet on which a plurality of surface-mounted crystal resonators are formed,
In the substrate sheet, a break line that divides the region of each surface-mount crystal resonator in the vertical direction and the horizontal direction and a through hole that penetrates the sheet at a position where the break line intersects,
A through terminal for conducting the inner surface of the through hole by printing or electroless plating, a metal pattern of a corner terminal so as to surround the through hole, and a first mounting terminal and a first parallel to each of the short sides in the region 2 to form a metal pattern of mounting terminals,
In the metal pattern of the first mounting terminal, one corner near the corner terminal is connected to the corner terminal, and the other corner near the corner terminal is connected to the corner terminal by a dividing portion having a specific interval. It was divided without
In the metal pattern of the second mounting terminal, one corner near the corner terminal is connected to the corner terminal, and the other corner near the corner terminal is connected to the corner terminal by a dividing portion having a specific interval. A method for producing a substrate sheet, wherein the substrate sheet is divided without being divided.   9. The method of manufacturing a substrate sheet according to claim 8, wherein the corner terminal to which the first mounting terminal is connected and the corner terminal to which the second mounting terminal is connected are diagonal in the region.

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