JP2012114810A - Surface-mounted crystal oscillator and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface-mounted crystal oscillator which has reduced size and improved quality, increases productivity, and is capable of performing highly accurate frequency adjustment and electric inspection, and to provide a method for manufacturing the surface-mounted crystal oscillator.SOLUTION: Of two through holes 2c connecting a crystal holding terminal 4 and a mounting terminal 3 on a rectangular base substrate, a first through hole is formed on one side of two opposite sides of a rectangular region of the base substrate, a second through hole is formed on the other side of the region at a position substantially point-symmetric to the position of the first through hole with respect to the center of the rectangular region. A third through hole connected to a mounting terminal 3 serving as an idle terminal is formed on the same side as the first through hole oppositely to the first through hole in an equal distance with respect to a midpoint of the side. A fourth through hole connected to the mounting terminal 3 serving as the idle terminal is formed on the same side as the second through hole oppositely to the second through hole in an equal distance with respect to a midpoint of the side. The first, second, third, and fourth through holes are included in a surface-mounted crystal oscillator.

Description

  The present invention relates to a surface-mount crystal unit, and in particular, a surface-mount crystal that can achieve downsizing, improve quality, improve productivity, and perform highly accurate frequency adjustment and electrical inspection. The present invention relates to a vibrator and a manufacturing method thereof.

[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.

[Related technologies]
As related prior arts, Japanese Unexamined Patent Application Publication No. 2007-158419 “Surface Mounted Crystal Oscillator” (Nippon Denpa Kogyo Co., Ltd.) [Patent Document 1], Japanese Unexamined Patent Application Publication No. 2003-179456 “Surface Mount Container for Crystal Products and the Same” There is a crystal product using “Nippon Denpa Kogyo Co., Ltd.” [Patent Document 2].

Patent Document 1 shows a configuration in which a crystal piece 3 is mounted on an IC chip 2, an IC chip 2 or the like is formed on a mounting substrate 4, and a metal cover 5 is provided in a surface mount crystal oscillator. .
Patent Document 2 shows a configuration in which a crystal piece 3 is provided on a single-layer substrate 1A via a crystal terminal 6 and hermetically sealed with a cover 2 in a surface mount container for crystal products.

  Further, as another related technique, Japanese Patent Laid-Open No. 2006-186666, “Method of manufacturing crystal resonator package” (Kyocera Kinki Corporation) [Patent Document 3], Japanese Patent Laid-Open No. 2004-140430, “Ultra-small crystal oscillator” ( (Nippon Denpa Kogyo Co., Ltd.) [Patent Document 4], Japanese Patent Application Laid-Open No. 7-336143, “Crystal Oscillator” (Seikosha Co., Ltd.) [Patent Document 5], Japanese Patent Application Laid-Open No. 10-229274, “Land Format of Crystal Oscillator” (Yazaki Corporation) [Patent Document 6].

Patent Document 3 describes that the four corners of the frame portion are formed so as to protrude to the inside of the opening, and a through hole is formed at a predetermined location in the cutting region.
Further, Patent Document 4 describes that a half through hole for electrically connecting a crystal resonator and a base substrate is provided at an outer edge portion of a spacer.
Patent Document 5 describes that a semicircular groove is formed on the side end surface of a circuit board, the extraction electrode extends toward the groove, and the groove becomes a connection terminal.
Patent Document 6 describes that a crystal oscillates and a plurality of through holes are provided on a week side surface of a main body and are welded via a soldering portion.

JP 2007-158419 A JP 2003-179456 A JP 2006-186666 A JP 2004-140430 A JP 7-336143 A JP-A-10-229274

  However, in the above conventional surface mount crystal resonator, when a crystal piece that has been increasingly miniaturized in recent years is mounted on a substrate and further sealed and sealed with a cover, the defect rate is reduced and productivity is improved, There was a problem that it was difficult to improve the quality.

  Specifically, when the crystal piece and the cover are downsized, there are a crystal holding terminal that is connected to the crystal piece with a conductive adhesive and holds the crystal unit, and a lead terminal that is drawn from the crystal holding terminal to the electrode. Therefore, it is necessary to devise an electrical short circuit (short circuit), and the conventional configuration cannot sufficiently cope with downsizing.

In view of this, a surface-mounted crystal resonator has been proposed that achieves miniaturization while improving quality and improving productivity.
The proposed surface mount crystal resonator will be briefly described.
In the proposed surface mount crystal resonator, a through terminal is formed on the wall surface of a through hole formed in a corner of a rectangular substrate, and the lead terminals of the crystal holding terminal that holds the crystal piece on the surface of the substrate are mutually connected. A mounting terminal connected to each through terminal on the diagonal line and connected to the through terminal is formed on the back surface of the substrate.

  In this way, by pulling out the lead terminal to the corner of the board and connecting to the through terminal at the corner, it is possible to connect to the through terminal as compared to when pulling out the lead terminal in the short side direction or long side direction of the board. Therefore, even if the position of the metal cover is shifted, it is possible to prevent the crystal holding terminal and the through terminal from being short-circuited through the metal cover.

  Then, in the proposed manufacturing process of the surface mount crystal resonator, the surface of each region separated by the break line and the sheet-like base (base substrate) formed with the break line divided into a plurality of regions, and A metal terminal pattern (terminal pattern) is formed on the back surface, and then a crystal piece is fixed and mounted on the front surface with a conductive adhesive, and a metal cover is placed and hermetically sealed.

A terminal pattern formed on the sheet-like base substrate of the proposed surface-mounted crystal resonator will be described with reference to FIGS. FIG. 4 is an explanatory view showing a terminal pattern on the surface of the sheet-like base substrate in the proposed surface-mount crystal resonator, and FIG. 5 is a back surface of the sheet-like base substrate in the proposed surface-mount crystal resonator. It is explanatory drawing which shows this terminal pattern.
As shown in FIG. 4, the sheet-like base substrate 11 of the proposed surface-mount crystal unit is divided into a plurality of regions by a break line 10, and two crystal holding terminals 14 are formed in each region. Yes.

The crystal holding terminal 14 for each region is drawn toward a through hole provided at a corner of each region where the break lines intersect, and is connected to a through terminal 12 formed on the inner wall of the through hole. The through terminal 12 is further connected to a mounting terminal provided on the back surface.
In each region, each crystal holding terminal 14 is connected to a through terminal 12 on a diagonal line.

  In other words, on the surface of the sheet-like base substrate 11 of the proposed surface-mount crystal resonator, the crystal holding terminals 14 in the two regions that are in contact with each other share the through terminal 12 on the broken line in FIG. It has become.

As shown in FIG. 5, a pattern of four mounting terminals 13 is formed in each region on the back surface of the sheet-like base substrate 11, and two mounting terminals 13a located on one diagonal line among them are formed. Is pulled out toward the through terminal 12 to be a hot terminal connected to the through terminal 12 and the crystal holding terminal 14 on the surface. The mounting terminal 13a, which is a hot terminal, shares the through terminal 12 on the broken line in FIG.
The mounting terminal 13b located on the other diagonal line is not connected to the through terminal 12 and is a free terminal.

[Example of frequency adjustment and electrical inspection: Fig. 6]
Next, frequency adjustment and electrical inspection of the surface-mounted crystal resonator formed on the sheet-like base substrate will be described with reference to FIG. FIG. 6 is an explanatory diagram showing an example of the result of frequency adjustment and electrical inspection of the surface-mounted crystal resonator formed on the sheet-like base substrate.
When the terminal pattern as shown in FIGS. 4 and 5 is formed, the electrode drawn from the excitation electrode of the crystal piece is fixed to the crystal holding terminal 14 with a conductive adhesive, and the crystal piece is mounted.
Thereafter, frequency adjustment and electrical inspection are performed.

In frequency adjustment and electrical inspection, a measurement terminal (probe) from a measuring instrument is brought into contact with a mounting terminal 13a electrically connected to a crystal piece, and a frequency or the like is measured.
At that time, as shown in FIG. 6, in the surface mount crystal resonator formed on the sheet-like base substrate as shown in FIGS. 4 and 5, in addition to the main resonance from the crystal piece to be adjusted (inspected) Unnecessary resonance occurs due to the influence of an adjacent crystal piece that shares the through terminal 12 with the crystal piece.

  Therefore, when a surface-mounted crystal resonator is formed on a sheet-like base substrate, it is desired to perform more accurate and accurate frequency adjustment and electrical inspection.

  The present invention has been made in view of the above-described circumstances, and achieves miniaturization, improves quality, improves productivity, and performs surface-mounted crystal vibration capable of performing high-precision frequency adjustment and electrical inspection. It aims at providing a child and its manufacturing method.

  In the present invention, a crystal piece is mounted on a rectangular substrate, the crystal piece is held on the front surface of the substrate by the first and second crystal holding terminals, and the first to fourth mounting terminals are formed on the back surface of the substrate. A surface-mounted crystal resonator comprising two through holes on two opposing sides of a rectangular substrate, and the first through hole is located on one of the two opposing sides. It is provided at a position other than the point and both ends, connects the first crystal holding terminal and the first mounting terminal, and the second through hole is on the other side of the two opposite sides with respect to the center of the rectangle The first through hole is provided at a position that is substantially point-symmetrical, connects the second crystal holding terminal and the second mounting terminal, and the third through hole is located on the one side and in the one side. Provided on the opposite side of the first through hole from the point at a position approximately equidistant from the first through hole The third mounting terminal is not connected to the crystal holding terminal, and the fourth through hole is located on the other side from the midpoint of the other side to the side opposite to the second through hole. The fourth mounting terminal is provided so as not to be connected to the crystal holding terminal.

  Further, the present invention is characterized in that, in the surface mount crystal resonator, two opposing sides are short sides.

  Further, the present invention is characterized in that, in the surface mount crystal resonator, two opposing sides are long sides.

  According to the present invention, in the surface-mounted crystal resonator, the first and second crystal holding terminals are each connected to the through hole via the extraction electrode, and an end portion connected to the extraction terminal of the one crystal holding terminal; The opposite end portion is characterized in that the end portion connected to the lead terminal of the other crystal holding terminal is formed at a position inside the line extending in the longitudinal direction of the rectangular substrate.

  The present invention also relates to a method of manufacturing a surface-mounted crystal resonator in which a crystal piece is mounted on a rectangular substrate, the crystal piece is held by a crystal holding terminal on the surface of the substrate, and a mounting terminal is formed on the back surface of the substrate. Then, a break line is formed on a sheet-like base substrate to form a plurality of rectangular areas, two through holes are formed on the break line that becomes a short side separating adjacent rectangular areas, and the through holes are formed inside the through holes. A through terminal in one through hole formed on the same short side connects the crystal holding terminal and the mounting terminal in one rectangular region adjacent to each other through the short side, and the other rectangular The crystal holding terminal and the mounting terminal in the region are not connected, and the through terminal in the other through hole formed on the same short side connects the crystal holding terminal and the mounting terminal in the other rectangular region. Nori So as not to connect the crystal holding terminals and the mounting pins in area, to form a crystal holding terminals on a surface of the base substrate, it is characterized by forming a mounting terminal on the back surface of the base substrate.

  The present invention also relates to a method of manufacturing a surface-mounted crystal resonator in which a crystal piece is mounted on a rectangular substrate, the crystal piece is held by a crystal holding terminal on the surface of the substrate, and a mounting terminal is formed on the back surface of the substrate. Then, a break line is formed on a sheet-like base substrate to form a plurality of rectangular areas, two through holes are formed on the break line which is a long side separating adjacent rectangular areas, and a through hole is formed inside the through hole. A through terminal in one through hole formed on the same long side connects the crystal holding terminal and the mounting terminal in one rectangular region adjacent to each other through the long side, and the other rectangular The crystal holding terminal and the mounting terminal in the region are not connected, and the through terminal in the other through hole formed on the same long side connects the crystal holding terminal and the mounting terminal in the other rectangular region. Nori So as not to connect the crystal holding terminals and the mounting pins in area, to form a crystal holding terminals on a surface of the base substrate, it is characterized by forming a mounting terminal on the back surface of the base substrate.

  Further, the present invention is a sheet-like base substrate for forming a plurality of surface-mounted crystal resonators, and is divided into a plurality of rectangular areas in a matrix by break lines, on the short side or long side of the rectangular area Two through-holes are formed, electrodes for connecting the front and back surfaces are formed in the through-holes, crystal holding terminals are formed on the front surface for each rectangular area, and a rectangular adjacent to the through-hole is centered on the back surface Mounting terminals are formed across the area, and the electrode in one through hole formed on the same short side or long side is connected to the crystal holding terminal of one adjacent rectangular area through the side, but the other Although the electrode in the other through-hole formed on the same short side or the long side is connected to the crystal holding terminal in the other rectangular area, It is characterized in that the not connected to crystal holding terminals of the rectangular region.

  According to the present invention, a crystal piece is mounted on a rectangular substrate, the crystal piece is held by the first and second crystal holding terminals on the surface of the substrate, and the first to fourth mounting terminals are provided on the back surface of the substrate. A surface-mounted crystal resonator formed with two through holes on two opposing sides of a rectangular substrate, and the first through hole is located on either side of the opposing side. Are provided at positions other than the middle point and both ends, connecting the first crystal holding terminal and the first mounting terminal, and the second through hole is formed at the center of the rectangle on the other side of the two opposite sides. On the other hand, the first through-hole is provided at a substantially point-symmetrical position, connects the second crystal holding terminal and the second mounting terminal, and the third through-hole is on the one side on the one side. A position approximately equidistant from the first through hole on the opposite side of the first through hole from the midpoint Provided, the third mounting terminal is not connected to the crystal holding terminal, and the fourth through hole is formed on the other side from the midpoint of the other side to the side opposite to the second through hole. The surface mount crystal unit is provided at a position approximately equidistant from the two through holes and does not connect the fourth mounting terminal to the crystal holding terminal, so that a plurality of sets are assembled in a matrix on the sheet-like base substrate. The first and second through holes to which the first and second mounting terminals, which are hot terminals, are connected, the third and fourth through holes in the adjacent surface-mount crystal resonator. Since it corresponds to a hole and is not connected to the crystal holding terminal, even when the probe terminal of the measuring instrument is brought into contact with the first and second mounting terminals when performing frequency adjustment or electrical inspection, the adjacent surface mounting Quartz crystal holding Without electrically connecting to the child, preventing the occurrence of an unwanted resonance caused by the adjacent vibrator, to improve the accuracy of the frequency adjustment and electrical testing, there is an effect that it is possible to perform an accurate adjustment and inspection.

  Further, according to the present invention, the first and second crystal holding terminals are connected to the through holes via the lead electrodes, respectively, and the end portion on the opposite side to the end portion connected to the lead terminal of one crystal holding terminal is Since the surface mount crystal resonator is formed at a position where the end connected to the lead terminal of the other crystal holding terminal is located inside the line extending in the longitudinal direction of the rectangular substrate, the metal cover is misaligned. Even if there is, there is an effect that the crystal holding terminals can be prevented from being short-circuited via the metal cover.

  In addition, according to the present invention, a surface-mounted crystal resonator in which a crystal piece is mounted on a rectangular substrate, the crystal piece is held by a crystal holding terminal on the surface of the substrate, and a mounting terminal is formed on the back surface of the substrate. A method, in which a break line is formed on a sheet-like base substrate to form a plurality of rectangular areas, two through holes are formed on a break line that is a short side separating adjacent rectangular areas, and the inside of the through hole is formed. The through terminal is formed on one of the rectangular regions, and one through hole formed on the same short side connects the crystal holding terminal and the mounting terminal of one rectangular region adjacent to each other through the short side, and The crystal holding terminal and the mounting terminal are not connected, and the other through hole formed on the same short side connects the crystal holding terminal and the mounting terminal in the other rectangular area, and holds the crystal in one rectangular area. Terminal and Since the manufacturing method is such that the crystal holding terminals are formed on the surface of the base substrate and the mounting terminals are formed on the back surface of the base substrate so as not to connect to the mounting terminals, the surface-mount crystal resonator is integrated on the sheet-like base substrate. When the frequency adjustment or electrical inspection is performed in the state where the probe is connected to the mounting terminal of one adjacent surface-mount crystal unit, the other surface-mount crystal unit Without being electrically connected to the crystal holding terminal, it is possible to prevent the occurrence of unnecessary resonance due to the adjacent vibrator, improve the frequency adjustment and the accuracy of electrical inspection, and perform accurate adjustment and inspection. .

  Further, according to the present invention, there is provided a sheet-like base substrate that forms a plurality of surface-mounted crystal resonators, and is divided into a plurality of rectangular regions in a matrix by break lines, and the short side or the long side of the rectangular region Two through-holes are formed on the top, electrodes for connecting the front and back surfaces are formed in the through-holes, crystal holding terminals are formed on the front surface for each rectangular area, and adjacent to the back surface with the through hole as the center. A mounting terminal is formed across the rectangular area, and the electrode in one through hole formed on the same short side or long side is connected to the crystal holding terminal of one adjacent rectangular area through the side. , Not connected to the crystal holding terminal in the other rectangular area, and the electrode in the other through-hole formed on the same short side or long side is connected to the crystal holding terminal in the other rectangular area Since the base substrate is not connected to the crystal holding terminal in one rectangular area, the hot terminals of adjacent surface-mount crystal units do not share electrodes in the same through-hole. In this case, there is an effect that the influence of the adjacent vibrator is eliminated to prevent the occurrence of unnecessary resonance, the accuracy is improved, and the accurate measurement can be performed.

It is explanatory drawing of the 1st terminal pattern in the surface mount crystal resonator which concerns on embodiment of this invention, (a) has shown the back surface pattern, (b) has shown the surface pattern. It is explanatory drawing of the 2nd terminal pattern in the surface mount crystal resonator which concerns on embodiment of this invention, (a) is a back surface pattern, (b) has shown the surface pattern. It is the plane schematic which shows the length of the crystal holding terminal in this surface mount crystal oscillator, (a) has shown the 1st terminal pattern, (b) has shown the 2nd terminal pattern. It is explanatory drawing which shows the terminal pattern of the surface of the sheet-like base substrate in the surface mounted crystal oscillator proposed. It is explanatory drawing which shows the terminal pattern of the back surface of the sheet-like base substrate in the surface mount crystal oscillator proposed. It is explanatory drawing which shows an example of the result of the frequency adjustment and electrical test | inspection of the surface mount crystal resonator formed in the sheet-like base substrate.

Embodiments of the present invention will be described with reference to the drawings.
[Outline of the embodiment]
In the surface-mounted crystal resonator according to the embodiment of the present invention, a crystal holding terminal connected to a crystal piece is formed on the surface of a rectangular substrate, a mounting terminal is formed on the back surface, and the crystal holding terminal and the mounting terminal are connected. Of the two through holes, the first through hole is provided at a position other than the midpoint and both ends on one short side of the rectangular substrate, and the second through hole is formed on the other short side of the rectangle. The position of the first through hole with respect to the center of the substrate is provided at a position that is substantially a point object, and is formed on a sheet-like base substrate that is divided into a plurality of rectangular regions by break lines. In cases where adjacent surface mount crystal units are configured so that hot terminals do not share through terminals, unnecessary resonance can be prevented, frequency adjustment and electrical inspection accuracy can be improved, and accurate measurement can be performed. Can It is intended.

  In the surface mount crystal resonator according to the embodiment of the present invention, the first through hole is provided at a position other than the middle point on one long side of the rectangular region, and the second through hole is On the other long side, the position of the first through hole with respect to the center of the rectangular area is provided at a position that is substantially the target of a point, and is a sheet that is divided into a plurality of rectangular areas by break lines When formed on a rectangular base substrate, the hot terminals do not share through terminals even between adjacent surface-mount crystal units, preventing unnecessary resonance and improving the accuracy of frequency adjustment and electrical inspection Therefore, accurate measurement can be performed.

  Further, the sheet-like base substrate on which the surface-mounted crystal resonator according to the embodiment of the present invention is manufactured is divided into a plurality of matrix-like rectangular regions by break lines, crystal holding terminals are formed on the surface, and the back surface is formed. A mounting terminal is formed, and two through holes are provided on a short side that separates adjacent regions, and one through hole connects a crystal holding terminal and a mounting terminal of one region adjacent to each other through the short side. The other through-hole is formed so as to connect the crystal holding terminal and the mounting terminal of the other area adjacent to each other through the short side. When a vibrator is formed, it can be configured so that the hot terminals of adjacent vibrators on the sheet substrate do not share the through terminal, preventing unnecessary resonance during frequency adjustment and electrical inspection, and accuracy. Improved, it is capable of performing accurate measurement.

[Terminal pattern (1) of base substrate according to the present embodiment]
A first terminal pattern of a base substrate in a surface-mounted crystal resonator according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory diagram of a first terminal pattern in a surface-mounted crystal resonator according to an embodiment of the present invention, where (a) shows a back surface pattern and (b) shows a surface pattern.
FIGS. 1A and 1B show two regions adjacent to each other at the short side of the region among a plurality of regions divided by break lines on the sheet-like base substrate.

In the first terminal pattern of the surface-mounted crystal resonator, as shown in FIGS. 1A and 1B, the through-hole 2b for connecting the crystal holding terminal 4 and the mounting terminal 3 is 2 on the short side. Individually formed.
The two through holes 2b on the short side are formed at substantially equal distances from the center of the short side. When the sheet-like base substrate is used, the through holes 2b provided on the short side are all formed at substantially the same distance from the center of the short side. As in the prior art, a through terminal is formed in the through hole 2b.

  As shown in FIG. 1A, a mounting terminal 3 is formed on the back surface of the surface-mounted crystal resonator so as to be connected to the through hole 2b. In each substrate separated from the sheet-like base substrate, the mounting terminal 3a is a hot terminal that is connected to the crystal holding terminal 4 through the through hole 2b, and the mounting terminal 3b is connected to the through hole 2b, but holds the crystal. It is an empty terminal that is not connected to the terminal 4.

  That is, in the adjacent region sharing the same through hole 2b, one of the two mounting terminals 3 sharing the through hole 2b is a hot terminal and the other is an empty terminal, and the hot terminals are the same. The through hole 2b is not shared.

  When attention is paid to one region, the through-holes 2b connecting the crystal holding terminals 4 and the mounting terminals 3 in the same region are provided at positions that are substantially point-symmetric with respect to the center of the region. become.

  As shown in FIG. 1B, a through-hole peripheral terminal 41 is formed around the surface of the surface-mounted crystal resonator, connected to the through-hole 2b provided on the short side. Yes. The through hole peripheral terminal 41a is connected to a lead terminal 42 drawn from the crystal holding terminal 4 connected to the crystal piece.

That is, in each substrate separated from the sheet-like base substrate, the crystal holding terminal 4, the lead terminal 42, and the through-hole peripheral terminal 41a are hot terminals that are connected to the mounting terminal 3a on the back surface through the through-hole 2b. ing.
The through-hole peripheral terminal 41b is an empty terminal that is not connected to the crystal piece.

  Then, as shown at the left end of (a), after the terminal pattern is formed, the insulating layer 7 is formed, a crystal piece is mounted thereon, and the metal cover 5 is covered and sealed. Yes.

  As described above, in the first terminal pattern of the surface-mounted crystal resonator, two through holes 2b are provided on the short side instead of the corners of the region divided by the break line, and one through hole 2b is the short terminal. By connecting to the hot terminal of one adjacent region through the side and connecting the other through hole 2b to the hot terminal of the other region, when performing frequency adjustment or electrical inspection, When two mounting terminals 3a, which are terminals, are probed, there is no portion to be electrically connected to the mounting terminal 3a of the adjacent surface-mount crystal resonator, so that it is not affected by the adjacent resonator and is unnecessary. It is possible to prevent the occurrence of resonance.

  In addition, as shown to (a) and (b), the through-hole 2a is provided in the position equivalent to the corner | angular part of each area | region at the intersection of each break line similarly to the past. The through-hole 2a facilitates cutting when the sheet-like base substrate is finally cut along the break line, but the through-hole 2a is not necessarily formed.

[Terminal pattern (2) of base substrate according to this embodiment: FIG. 2]
Next, the second terminal pattern of the base substrate in the surface mount crystal resonator according to the embodiment of the present invention will be described with reference to FIG. 2A and 2B are explanatory diagrams of a second terminal pattern in the surface-mounted crystal resonator according to the embodiment of the present invention. FIG. 2A shows a back surface pattern and FIG. 2B shows a surface pattern.
2A and 2B show two regions adjacent to each other at the long side of the region, out of a plurality of regions divided by break lines on the sheet-like base substrate.

In the second terminal pattern, as shown in FIGS. 2A and 2B, two through holes 2c for connecting the crystal holding terminal 4 and the mounting terminal 3 are formed on the long side.
The through holes 2c on the same long side are formed at substantially the same distance from the center of the long side, and when formed on a sheet-like base substrate, the through holes 2c on the long side are all in the center of the long side. It is formed at an approximately equidistant position.

  As shown in FIG. 2A, on the back surface of the surface-mounted crystal resonator, a mounting terminal 3 is formed so as to be connected to the through hole 2c, and in each substrate separated from the sheet-like base substrate, The mounting terminal 3a is a hot terminal, and the mounting terminal 3b is an empty terminal. In other words, in the adjacent region on the long side, the same through hole 2c is connected to the hot terminal mounting terminal 3a and the empty terminal mounting terminal 3b, and the hot terminals share the same through hole 2c. There is no.

  Similarly to the case of providing on the short side, when attention is paid to one region, the through hole 2c that connects the crystal holding terminal 4 and the mounting terminal 3 in the same region is substantially pointed with respect to the center of the region. It is provided in the position.

Then, as shown in FIG. 2B, a through-hole peripheral terminal 41 is formed around the surface of the second surface-mounted crystal resonator connected to the through-hole 2c provided on the long side. Has been. Further, the through hole peripheral terminal 41a is connected to the lead terminal 42 and the crystal holding terminal 4, and in each substrate separated from the sheet-like base substrate, the through hole peripheral terminal 41a, the lead terminal 42, and the crystal holding terminal. The terminal 4 is a hot terminal.
The through-hole peripheral terminal 41b is an empty terminal.

  Even in the surface-mounted crystal resonator formed with the second terminal pattern, when two mounting terminals 3a which are hot terminals in each region are probed when performing frequency adjustment or electrical inspection, adjacent surface-mounted crystal Since it does not have a portion to be electrically connected to the mounting terminal 3a of the vibrator, it is possible to prevent unnecessary resonance from occurring without being influenced by the adjacent vibrator.

[Length of crystal holding terminal: Fig. 3]
Next, the length of the crystal holding terminal in the surface mounted crystal resonator will be described with reference to FIG. FIG. 3 is a schematic plan view showing the length of the crystal holding terminal in the surface-mounted crystal resonator, wherein (a) shows the first terminal pattern and (b) shows the second terminal pattern.
As shown in FIG. 3A, in this surface-mounted crystal resonator, on the surface of the first terminal pattern, the crystal holding terminal 4 is elongated to the through-hole peripheral terminal 41a and the extraction terminal 42 connected to the through-hole 2b. It is formed so that the end of one side in the direction is in contact.
A circuit including the through-hole 2b, the through-hole peripheral terminal 41a, the lead-out terminal 42, and the crystal holding terminal 4 is arranged substantially point-symmetrically with respect to the center of the surface-mounted crystal resonator.

The end of the one crystal holding terminal 4 opposite to the end connected to the lead terminal 42 is the end (end face) connected to the lead terminal 42 of the other crystal holding terminal 4. It is formed at a position that is inward by a length L1 from a straight line extending in a direction orthogonal to the length direction (longitudinal direction of the rectangular region).
Conventionally, the crystal holding terminal 4 is formed to have a length in contact with a straight line extending from the end connected to the lead terminal 42 of the other crystal holding terminal 4. The length L1 is shorter than the conventional one.

Further, as shown in FIG. 3B, on the surface of the second terminal pattern, the through hole 2c, the through hole peripheral terminal 41a, the lead terminal 42a, and the crystal holding terminal 4 are substantially aligned with the short side of the region in the base sheet. It is formed in parallel with.
Similarly to the first terminal pattern, the end on the opposite side to the end connected to the lead terminal 42 of one crystal holding terminal 4 is the end connected to the lead terminal 42 of the other crystal holding terminal 4. It is formed at a position entering the inside by a length L2 from the straight line extending from, and is formed by a length L2 shorter than the conventional one.

  Even if the metal cover contacts one of the crystal holding terminals 4 when the metal cover is misplaced by forming the crystal holding terminal 4 short as shown in FIGS. The tip of the other crystal holding terminal 4 is in a position where only L1 or L2 enters inside, so that it does not contact the metal cover. Therefore, it is possible to prevent one crystal holding terminal 4 and the other crystal holding terminal from being short-circuited via the metal cover.

[Manufacturing Method of the Surface Mounted Crystal Resonator: FIGS. 1 and 2]
Next, a method for manufacturing the surface mounted crystal resonator will be briefly described. Here, a case where the sheet-like base substrate is formed of ceramic will be described as an example.
First, a break line that separates adjacent regions is formed on a ceramic sheet-like base substrate. At that time, a through hole 2b on the short side or a through hole 2c on the long side, which is a characteristic part of the surface-mounted crystal resonator, is also formed at the same time. If necessary, through holes 2a are also formed at the corners of each region where break lines intersect. And it bakes after that and obtains a sheet-like base substrate.

Next, the terminal pattern shown in FIG. 1 or FIG. 2 is formed.
Specifically, for each region on the base substrate, a metal paste of AgPd (silver-palladium) alloy is formed by printing using a mask corresponding to the terminal pattern.
As for the terminal pattern, the pattern of the crystal holding terminal 4 is formed on one main surface (front surface), the pattern of the mounting terminals 3a and 3b is formed on the other main surface (back surface), and the wall surface of the through hole 2b or 2c. A through terminal is formed in the.

In the first terminal pattern shown in FIG. 1, four through holes 2b are formed on the short side of each region, and two sets of point-symmetrical arrangements are formed with respect to the center of the region.
In the second terminal pattern shown in FIG. 2, the four through holes 2c are formed on the long sides of each region so as to be arranged in two sets of point symmetry with respect to the center of the region.

Then, the through-hole peripheral terminal 41a, the lead-out terminal 42, and the crystal holding terminal 4 are formed so as to be connected to the pair of through-holes 2b or 2c arranged symmetrically. These serve as hot terminals connected to the crystal piece.
Only the through-hole peripheral electrode 41b is formed in the other set of through-holes 2b or 2c, and the through-hole peripheral electrode 41b is an empty terminal that is not connected to the crystal piece.
And AgPd alloy paste is baked and the sheet-like base substrate in which the terminal pattern was formed is obtained.

Here, since the firing temperature of the ceramic is about 1500 to 1600 ° C. and the AgPd alloy is about 850 ° C., after firing the ceramic, the AgPd alloy paste is applied and the AgPd alloy paste is fired together with the ceramic.
This is because when AgPd alloy paste is applied to the ceramic fabric and fired at the firing temperature of the ceramic, the AgPd alloy becomes too hot and becomes agglomerated, and a terminal pattern cannot be formed.

Next, a crystal piece is mounted on each region of the sheet-like base substrate.
Specifically, the outer peripheral portion of the crystal piece provided with the extraction electrode extending from the excitation electrode is fixedly mounted on the crystal holding terminal 4 in each region with a conductive adhesive, and is electrically and mechanically connected. .
Here, a pair of diagonal portions in the crystal piece from which the extraction electrode extends are fixed.

Next, the vibration frequency of each crystal piece as a surface-mounted crystal resonator mounted (fixed) on the sheet-like base substrate is adjusted by the mass load effect.
Specifically, the measurement terminal (probe) from the measuring instrument is brought into contact with the mounting terminal 3a electrically connected to each crystal piece on the back surface of the sheet-like base substrate. Then, the excitation electrode on the surface side of the crystal piece with the plate surface exposed is irradiated with gas ions to scrape the surface, the mass of the excitation electrode is reduced, and the vibration frequency is adjusted from low to high.
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.

Next, the opening end face of the concave metal cover is joined to each region of the sheet-like base substrate on which the crystal piece is mounted via a sealing material.
Here, a resin previously applied to the opening end surface of the metal cover is used as a sealing material, and the resin is heated and melted for bonding. For example, the opening end face of the metal cover is L-shaped, and the so-called seal path is lengthened. As a result, individual crystal pieces are hermetically sealed and assembled into a sheet-like surface-mounted crystal resonator.

  Finally, the sheet-like base substrate on which the crystal resonators are assembled is divided vertically and horizontally according to the break line to obtain individual surface mount crystal resonators.

  In the manufacturing method of the present embodiment, the terminal pattern (through hole peripheral terminal 41, lead terminal 42, crystal holding terminal 4, mounting terminal 3, and through terminal) of the sheet-like base substrate is made of AgPd alloy and the through hole 2 is provided. An AgPd alloy paste is applied after firing the sheet-shaped ceramic fabric, and is formed by firing.

Therefore, compared to the case where Ni (nickel) and Au (gold) are formed by electrolytic plating after applying W (tungsten) paste to the sheet-like ceramic fabric in the conventional example, two electrolytic plating steps are unnecessary. Therefore, the number of manufacturing steps can be reduced.
In addition, since an electrolytic plating process is not required, for example, an electrolytic plating wiring path that electrically connects terminal patterns between adjacent regions is also unnecessary, so that the circuit pattern can be simplified and inexpensively provided. is there.

  Moreover, since the mounting of the crystal piece, the frequency adjustment, and the joining of the metal cover are continuously performed in the state of the sheet-like base substrate, there is an effect that productivity can be improved.

[Effect of the embodiment]
According to the surface-mounted crystal resonator according to the embodiment of the present invention, two through holes that connect the crystal holding terminal 4 provided on the surface of the base substrate formed in a rectangle and the mounting terminal 3 provided on the back surface. Among the holes 2b, a first through hole is provided at a position other than the midpoint and both ends on one short side of the rectangular region, and a second through hole is formed on the other short side of the rectangular region. The first through hole is provided at a position that is substantially point-symmetric with respect to the center, and a third through hole and a fourth through hole that are connected to the empty terminal are provided. On the short side where the first through hole is provided, the first through hole is equidistant from the midpoint of the short side on the side opposite to the first through hole. The short side where the second through hole is provided Since the surface-mounted crystal resonator is provided at the same distance from the second through hole on the side opposite to the second through hole from the midpoint of the short side, it is divided into a plurality of rectangular areas by the break line 10. In the case where the hot terminals of adjacent surface mount crystal resonators do not share the through terminals in the same through hole 2b when they are collectively formed in a matrix on the sheet-like base substrate formed, the frequency adjustment or In the electrical inspection, there is an effect that it is possible to eliminate the influence of adjacent vibrators, prevent the occurrence of unnecessary resonance, improve accuracy, and perform accurate measurement.

  In addition, according to the surface mount crystal resonator, of the two through holes 2c that connect the crystal holding terminal 4 provided on the surface of the base substrate formed in a rectangle and the mount terminal 3 provided on the back surface, The first through hole is provided at a position other than the midpoint and both ends on one long side of the rectangular region, and the second through hole is located on the other long side with respect to the center of the rectangular region. The position of one through hole is provided at a position that is substantially subject to a point, and a third through hole and a fourth through hole connected to the empty terminal are provided, and the third through hole is the first through hole. Is provided at an equal distance from the first through hole on the side opposite to the first through hole from the midpoint of the short side, and the fourth through hole is the second through hole. On the short side where the hole is located, Since the surface-mount crystal unit is provided on the side opposite to the second through hole from the point and equidistant from the second through hole, on the sheet-like base substrate divided into a plurality of rectangular regions by the break line 10 If the surface mount crystal resonators are formed in a matrix, the hot terminals of adjacent surface mount crystal resonators do not share the same through terminal. This eliminates the effect of preventing unnecessary resonance, improving accuracy, and performing accurate measurement.

  Further, according to the surface mount crystal resonator, one end of the crystal holding terminal 4 opposite to the end connected to the lead terminal 42 is connected to the lead terminal 42 of the other crystal holding terminal 4. Since it is formed at a position inside the length L1 from the straight line extending from the end and the length of the crystal holding terminal is shortened, even if there is a misalignment of the metal cover, One crystal holding terminal 4 and the other crystal holding terminal can be prevented from being short-circuited.

  Further, according to the method for manufacturing the surface-mounted crystal resonator according to the embodiment of the present invention, the sheet-like base substrate 11 is divided into a plurality of rectangular regions by the break line 10 and the short sides that separate adjacent regions are separated. Two through-holes are provided on the top, and one through-hole formed on the same short side connects only the crystal holding terminal and the mounting terminal in one adjacent region via the short side, and the other through-hole Form a crystal holding terminal on the surface of each area, form a mounting terminal on the back surface, and connect a crystal piece to each area so that only the crystal holding terminal and the mounting terminal of the other area adjacent to each other are connected via the short side. Mounted to form a surface-mount crystal resonator, and the hot terminals of adjacent resonators on the sheet substrate can be configured not to share the through terminals. Adjacent resonators are used for frequency adjustment and electrical inspection. Prevent the occurrence of an unwanted resonance is eliminated the influence, to improve accuracy, in which it is possible to perform an accurate measurement.

  The present invention is suitable for a surface-mount crystal resonator capable of improving the quality and improving the productivity while realizing miniaturization, and performing highly accurate frequency adjustment and electrical inspection, and a manufacturing method thereof.

  DESCRIPTION OF SYMBOLS 1 ... Base board | substrate, 2a, 2b, 2c ... Through hole (through-hole), 3a, 3b ... Mounting terminal, 4 ... Crystal holding terminal, 41a, 41b ... Through-hole peripheral terminal, 42 ... Lead terminal, 5 ... Metal cover, 7 ... Insulating layer 10 ... Break line, 12 ... Through terminal, 13 ... Mounting terminal, 14 ... Crystal holding terminal

Claims (7)

A crystal piece is mounted on a rectangular substrate, the crystal piece is held by the first and second crystal holding terminals on the surface of the substrate, and first to fourth mounting terminals are formed on the back surface of the substrate. A surface mount crystal unit,
Two through holes are provided on two opposite sides of the rectangular substrate,
A first through hole is provided on any one of the two opposing sides at a position other than the midpoint and both ends of the side, and connects the first crystal holding terminal and the first mounting terminal. ,
A second through hole is provided on the other side of the two opposite sides at a position that is substantially point-symmetric with the first through hole with respect to the center of the rectangle, and the second crystal holding terminal And the second mounting terminal,
A third through hole is provided on the one side on the opposite side of the first through hole from the midpoint of the one side at a position substantially equidistant from the first through hole. Without connecting the terminal to the crystal holding terminal,
A fourth through hole is provided on the other side, at a position approximately equidistant from the second through hole, on the opposite side of the second side from the midpoint of the other side; A surface-mounted crystal resonator, characterized in that the fourth mounting terminal is not connected to the crystal holding terminal.   The surface-mounted crystal resonator according to claim 1, wherein two opposing sides are short sides.   2. The surface mount crystal resonator according to claim 1, wherein two opposite sides are long sides. The first and second crystal holding terminals are respectively connected to the through holes via the extraction electrodes,
The end of the one crystal holding terminal opposite to the end connected to the lead terminal is inside the line extending from the end of the other crystal holding terminal connected to the lead terminal in the longitudinal direction of the rectangular substrate. 4. The surface-mounted crystal resonator according to claim 1, wherein the surface-mount crystal resonator is formed at a position where it enters. A method of manufacturing a surface-mounted crystal resonator in which a crystal piece is mounted on a rectangular substrate, the crystal piece is held by a crystal holding terminal on the surface of the substrate, and a mounting terminal is formed on the back surface of the substrate,
A break line is formed on a sheet-like base substrate to form a plurality of rectangular regions,
Two through-holes are formed on the break line that becomes the short side that separates adjacent rectangular regions,
A through terminal is formed inside the through hole,
A through terminal in one through hole formed on the same short side connects a crystal holding terminal of one rectangular region adjacent to the mounting terminal via the short side and a crystal holding terminal of the other rectangular region. And the through terminal in the other through hole formed on the same short side connects the crystal holding terminal and the mounting terminal of the other rectangular area, and the one rectangular area The crystal holding terminal is formed on the surface of the base substrate so that the crystal holding terminal is not connected to the mounting terminal, and the mounting terminal is formed on the back surface of the base substrate. Production method. A method of manufacturing a surface-mounted crystal resonator in which a crystal piece is mounted on a rectangular substrate, the crystal piece is held by a crystal holding terminal on the surface of the substrate, and a mounting terminal is formed on the back surface of the substrate,
A break line is formed on a sheet-like base substrate to form a plurality of rectangular regions,
Two through holes are formed on the break line that is the long side that separates adjacent rectangular regions,
A through terminal is formed inside the through hole,
The through terminals in one through hole formed on the same long side connect the crystal holding terminal of one rectangular region adjacent to the mounting terminal and the mounting terminal via the long side, and the crystal holding terminal of the other rectangular region And the through terminal in the other through hole formed on the same long side connects the crystal holding terminal and the mounting terminal of the other rectangular area, and the one rectangular area The crystal holding terminal is formed on the surface of the base substrate so that the crystal holding terminal is not connected to the mounting terminal, and the mounting terminal is formed on the back surface of the base substrate. Production method. A sheet-like base substrate for forming a plurality of surface-mount crystal units,
Divided into a plurality of rectangular areas in a matrix by break lines,
Two through holes are formed on the short side or long side of the rectangular region, and an electrode for connecting the front surface and the back surface is formed in the through hole,
Crystal holding terminals are formed on the surface for each of the rectangular regions,
A mounting terminal is formed across the rectangular region adjacent to the back surface around the through hole,
The electrode in one through-hole formed on the same short side or long side is connected to the crystal holding terminal of one rectangular region adjacent to the other through the side, but is connected to the crystal holding terminal of the other rectangular region. The electrode in the other through-hole formed on the same short side or long side is connected to the crystal holding terminal in the other rectangular region, but connected to the crystal holding terminal in the one rectangular region. Base substrate characterized by not.

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