JP2011234200A - Tuning-fork type bent crystal oscillating element - Google Patents

Tuning-fork type bent crystal oscillating element Download PDF

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JP2011234200A
JP2011234200A JP2010103737A JP2010103737A JP2011234200A JP 2011234200 A JP2011234200 A JP 2011234200A JP 2010103737 A JP2010103737 A JP 2010103737A JP 2010103737 A JP2010103737 A JP 2010103737A JP 2011234200 A JP2011234200 A JP 2011234200A
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vibrating arm
arm portion
main surface
groove
base
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Ryota Kawai
良太 河合
Atsuya Takahashi
敦哉 高橋
Mitsuhiko Negishi
満彦 根岸
Hisatoshi Saito
久俊 斉藤
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Kyocera Crystal Device Corp
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Kyocera Crystal Device Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a tuning-fork type bent crystal oscillating element which can be manufactured in a short time and which can be accurately adjusted to a desired frequency.SOLUTION: A tuning-fork type bent crystal oscillating element comprises a base and two vibration arm parts. A groove is provided on both principal surfaces of each of the vibration arm parts, and the groove on one principal surface of the vibration arm part and the groove on the other principal surface of the vibration arm parts are provided alternately shifted in the long direction of the vibration arm part. A metal film for frequency regulation is provided on the one principal surface of the tip of each of the vibration arm parts. The base side edge of the metal film for frequency regulation provided on the one principal surface of each of the vibration arm parts extends to the base side longer than the tip side edge of each of the vibration arm parts of an electrode for excitation provided on the other principal surface of each of the vibration arm parts.

Description

本発明は、電子機器に用いられる音叉型屈曲水晶振動素子に関する。   The present invention relates to a tuning fork-type bending crystal resonator element used in electronic equipment.

従来、コンピュータ,携帯電話又は小型情報機器等の電子機器には、電子部品の一つとして水晶振動子又は水晶発振器が搭載されている。この水晶振動子又は水晶発振器は、基準信号源やクロック信号源として用いられる。又、水晶振動子や水晶発振器には、その内部に音叉型屈曲水晶振動素子が搭載されている。   Conventionally, a crystal resonator or a crystal oscillator is mounted as an electronic component in an electronic device such as a computer, a mobile phone, or a small information device. This crystal resonator or crystal oscillator is used as a reference signal source or a clock signal source. In addition, a tuning fork-type bending crystal resonator element is mounted inside a crystal resonator or crystal oscillator.

図7は、従来の音叉型屈曲水晶振動素子の一例を示す斜視図である。図8は、従来の音叉型屈曲振動素子を構成する水晶片を示す平面図であり、(a)は一方の主面上から見た図であり、(b)は他方の主面上から見た図である。図9は、従来の音叉型屈曲振動素子を示す平面図であり、(a)は一方の主面上から見た図であり、(b)は他方の主面上から見た図である。
図7及び図9に示すように、音叉型屈曲水晶振動素子400は、水晶片410(図8を参照)と、その水晶片410の表面に設けられた励振用電極421a,421b,422a及び422bと、接続用電極423a及び423bと、周波数調整用金属膜424a及び424bと、導配線パターン425a,425b,425c,425d,425e及び425fとにより概略構成される。
FIG. 7 is a perspective view showing an example of a conventional tuning fork-type bending crystal resonator element. FIG. 8 is a plan view showing a crystal piece constituting a conventional tuning-fork type bending vibration element, where (a) is a view from one main surface, and (b) is a view from the other main surface. It is a figure. FIG. 9 is a plan view showing a conventional tuning fork-type bending vibration element, where (a) is a view from one main surface, and (b) is a view from the other main surface.
As shown in FIGS. 7 and 9, the tuning-fork type bending crystal resonator element 400 includes a crystal piece 410 (see FIG. 8) and excitation electrodes 421a, 421b, 422a and 422b provided on the surface of the crystal piece 410. And connection electrodes 423a and 423b, frequency adjusting metal films 424a and 424b, and conductive wiring patterns 425a, 425b, 425c, 425d, 425e, and 425f.

図8に示すように、水晶片410は、平面視略四角形の平板である基部411と、この基部411の一辺から同一方向に延出した第一の振動腕部412aと第二の振動腕部412bとからなる。
第一の振動腕部412aには、一方の主面に開口部を有しその開口部の長辺が第一の振動腕部412aの長さ方向に沿っている第一の溝部413aと、他方の主面に開口部を有しその開口部の長辺が第一の振動腕部412aの長さ方向に沿っている第二の溝部413bとが設けられている。この第一の溝部413aと第二の溝部413bとは、第一の溝部413a内の底面と第二の溝部413b内の底面とが第一の振動腕部412a内部で対向しないように、第一の振動腕部412aの両主面間で第一の振動腕部412aの長さ方向に交互にずらして設けられている。
As shown in FIG. 8, the crystal piece 410 includes a base portion 411 that is a substantially rectangular flat plate in plan view, and a first vibrating arm portion 412 a and a second vibrating arm portion that extend in the same direction from one side of the base portion 411. 412b.
The first vibrating arm portion 412a has an opening on one main surface, the first groove portion 413a having the long side of the opening along the length direction of the first vibrating arm portion 412a, and the other There is provided a second groove portion 413b having an opening in the main surface thereof and having a long side of the opening along the length direction of the first vibrating arm portion 412a. The first groove portion 413a and the second groove portion 413b are arranged so that the bottom surface in the first groove portion 413a and the bottom surface in the second groove portion 413b do not face each other inside the first vibrating arm portion 412a. The first vibrating arm portion 412a is alternately shifted in the length direction between both main surfaces of the vibrating arm portion 412a.

第二の振動腕部412bには、一方の主面に開口部を有し開口部の長辺が第二の振動腕部412bの長さ方向に沿っている第三の溝部413cと、他方の主面に開口部を有し開口部の長辺が第二の振動腕部412bの長さ方向に沿っている第四の溝部413dとが設けられている。この第三の溝部413cと第四の溝部413dとは、第三の溝部413c内の底面と第四の溝部413d内の底面とが第二の振動腕部412b内部で対向しないように、第二の振動腕部412bの両主面間で互い違いに第二の振動腕部412bの長さ方向にズラして設けられている。
尚、この両主面とは、基部411の表面積の最も広く形成されている面であって、一方の面と他方の面とが平行となった2つの面をいい、又、これら2つの面と同一の方向を向く第一の振動腕部412aと第二の振動腕部412bの面も含まれる。尚、図7では、図面で現われている面が「一方の主面」であり、隠れている面が「他方の主面」である(例えば、特許文献1参照)。
The second vibrating arm portion 412b includes a third groove portion 413c having an opening portion on one main surface and a long side of the opening portion along the length direction of the second vibrating arm portion 412b, and the other A fourth groove portion 413d having an opening on the main surface and having a long side along the length direction of the second vibrating arm portion 412b is provided. The third groove portion 413c and the fourth groove portion 413d are arranged so that the bottom surface in the third groove portion 413c and the bottom surface in the fourth groove portion 413d do not face each other inside the second vibrating arm portion 412b. The vibration arm portions 412b are alternately shifted in the length direction of the second vibration arm portion 412b between the main surfaces.
The two main surfaces are the surfaces having the largest surface area of the base portion 411 and are two surfaces in which one surface and the other surface are parallel to each other. The surfaces of the first vibrating arm portion 412a and the second vibrating arm portion 412b facing the same direction are also included. In FIG. 7, the surface appearing in the drawing is “one main surface”, and the hidden surface is “the other main surface” (see, for example, Patent Document 1).

図7及び図9に示すように、励振用電極421aは、第一の溝部413a及び第二の溝部413bの内部表面を含む第一の振動腕部412aの対向する両主面に、同一の形状でそれぞれ設けられている。励振用電極421bは、第一の振動腕部412aの対向する両側面にそれぞれ設けられている。又、励振用電極422aは、第三の溝部413c及び第四の溝部413dの内部表面を含む第二の振動腕部412bの対向する両主面に、同一の形状でそれぞれ設けられている。更に、励振用電極422bは、第二の振動腕部412bの対向する両側面に設けられている。   As shown in FIG. 7 and FIG. 9, the excitation electrode 421a has the same shape on both opposing main surfaces of the first vibrating arm portion 412a including the inner surfaces of the first groove portion 413a and the second groove portion 413b. Are provided respectively. The excitation electrodes 421b are respectively provided on opposite side surfaces of the first vibrating arm portion 412a. The excitation electrode 422a is provided in the same shape on both opposing main surfaces of the second vibrating arm portion 412b including the inner surfaces of the third groove portion 413c and the fourth groove portion 413d. Further, the excitation electrode 422b is provided on both opposing side surfaces of the second vibrating arm portion 412b.

尚、それぞれの励振用電極421bの第一の振動腕部412aの先端側の端部は、励振用電極421aの第一の振動腕部412aの先端側の端部よりも、第一の振動腕部412aの先端側に延出して設けられている。両励振用電極421bの第一の振動腕部412aの先端側の端部は、配線パターン425aにより電気的に接続している。この配線パターン425aは、第一の振動腕部412aの両主面の、励振用電極421aの第一の振動腕部412aの先端側の端部から所定の間隔を空けた位置に設けられている。
又、それぞれの励振用電極422bの第二の振動腕部412bの先端側の端部は、励振用電極422aの第二の振動腕部412bの先端側の端部よりも、第二の振動腕部412bの先端方向に延出して設けられている。両励振用電極422bの第二の振動腕部412bの先端側の端部は、配線パターン425bにより電気的に接続している。この配線パターン425bは、第二の振動腕部412bの両主面の、励振用電極422aの第二の振動腕部412bの先端側の端部から所定の間隔を空けた位置に設けられている。
Note that the end of the first vibrating arm 412a of each excitation electrode 421b is closer to the first vibrating arm than the end of the first vibrating arm 412a of the exciting electrode 421a is closer to the distal end. It extends to the tip side of the portion 412a. The ends of the first vibrating arm portion 412a of both excitation electrodes 421b are electrically connected by a wiring pattern 425a. The wiring pattern 425a is provided at a position spaced apart from both ends of the first vibrating arm portion 412a by an end on the tip side of the first vibrating arm portion 412a of the excitation electrode 421a. .
The end of the second vibrating arm portion 412b of each excitation electrode 422b is closer to the second vibrating arm than the end of the second vibrating arm portion 412b of the exciting electrode 422a is closer to the distal end. The portion 412b is provided so as to extend in the distal direction. The ends on the distal end side of the second vibrating arm portion 412b of both excitation electrodes 422b are electrically connected by a wiring pattern 425b. The wiring pattern 425b is provided at a position spaced apart from both ends of the second vibrating arm portion 412b by the end on the distal end side of the second vibrating arm portion 412b of the excitation electrode 422a. .

接続用電極423aは、基部411の幅方向において第一の振動腕部412aに近い側の両主面に対向させて設けられている。この接続用電極423aは励振用電極421bと電気的に接続している。又、この接続用電極423aは、基部411の一方の主面に設けられた導配線パターン425cと、励振用電極421bを介して基部411の他方の主面に設けられた導配線パターン425dとにより、第二の振動腕部412bの励振用電極422aとも電気的に接続している。   The connection electrode 423a is provided to face both main surfaces on the side close to the first vibrating arm portion 412a in the width direction of the base portion 411. The connection electrode 423a is electrically connected to the excitation electrode 421b. The connection electrode 423a includes a conductive wiring pattern 425c provided on one main surface of the base portion 411 and a conductive wiring pattern 425d provided on the other main surface of the base portion 411 through the excitation electrode 421b. The second vibrating arm portion 412b is also electrically connected to the excitation electrode 422a.

接続用電極423bは、基部411の幅方向において第二の振動腕部412bに近い側の両主面に対向させて設けられている。この接続用電極423bは励振用電極422bと電気的に接続している。又、この接続用電極423bは、基部411の他方の主面に設けられた導配線パターン425eと、励振用電極422bを介して基部411の一方の主面に設けられた導配線パターン425fとにより、第一の振動腕部412aの励振用電極421aと電気的に接続している。   The connection electrode 423 b is provided to face both main surfaces on the side close to the second vibrating arm portion 412 b in the width direction of the base portion 411. The connection electrode 423b is electrically connected to the excitation electrode 422b. The connection electrode 423b includes a conductive wiring pattern 425e provided on the other main surface of the base 411 and a conductive wiring pattern 425f provided on one main surface of the base 411 via the excitation electrode 422b. The first vibrating arm portion 412a is electrically connected to the excitation electrode 421a.

周波数調整用金属膜424aは第一の振動腕部412aの先端部分の一方の主面と両側面に設けられている。この一方の主面に設けられた周波数調整用金属膜424aは、長さ方向の基部411側の端部が配線パターン425aと接しており、第一の振動腕部412aの先端側の端部が第一の振動腕部412aの先端縁部に位置するように設けられている。
又、周波数調整用金属膜424bは第二の振動腕部412bの先端部分の両主面に設けられている。この周波数調整用金属膜424bは、長さ方向の基部411側の端部が配線パターン425bと接しており、第二の振動腕部412bの先端側の端部が第二の振動腕部412bの先端縁部に位置するように設けられている。尚、この音叉型屈曲水晶振動素子400の周波数調整は、それぞれの振動腕部の一方の主面に設けられた周波数調整用金属膜424a及び424bの一部をレーザ等で取り除くことにより周波数の粗調整を行った後、残った周波数調整用金属膜424a及び424bにイオンビームを照射し、周波数調整用金属膜424a及び424bを構成する金属を減量させて、音叉型屈曲水晶振動素子の周波数を所望の値に微調整する。(例えば、特許文献2参照)。
The frequency adjusting metal film 424a is provided on one main surface and both side surfaces of the tip portion of the first vibrating arm portion 412a. In the frequency adjusting metal film 424a provided on the one main surface, the end portion on the base portion 411 side in the length direction is in contact with the wiring pattern 425a, and the end portion on the front end side of the first vibrating arm portion 412a is The first vibrating arm portion 412a is provided so as to be positioned at the distal end edge portion.
The frequency adjusting metal film 424b is provided on both main surfaces of the tip portion of the second vibrating arm portion 412b. In the frequency adjusting metal film 424b, the end portion on the base portion 411 side in the length direction is in contact with the wiring pattern 425b, and the end portion on the tip end side of the second vibrating arm portion 412b is the second vibrating arm portion 412b. It is provided so that it may be located in a front-end edge part. The frequency adjustment of the tuning fork type bending crystal resonator element 400 is performed by removing a part of the frequency adjusting metal films 424a and 424b provided on one main surface of each vibrating arm portion with a laser or the like. After the adjustment, the remaining frequency adjusting metal films 424a and 424b are irradiated with an ion beam to reduce the amount of the metal constituting the frequency adjusting metal films 424a and 424b, so that the frequency of the tuning fork type bending crystal resonator element is desired. Fine-tune to the value of. (For example, refer to Patent Document 2).

尚、このような音叉型屈曲水晶振動素子400は、例えば、一方の主面に開口部を有する凹部を有する素子搭載部材の、凹部内底面に形成された素子接続用電極パッド上に搭載され、さらに凹部の開口部は蓋体により気密封止されて水晶振動子となる。
又、このような音叉型屈曲水晶振動素子400は、例えば、一方の主面に開口部を有する凹部を有する素子搭載部材の、凹部内底面に形成された素子接続用電極パッド上に搭載され、さらに凹部の開口部は蓋体により気密封止されつつ、少なくとも発振回路を備えた集積回路素子を、搭載した音叉型屈曲水晶振動素子400と電気的に接続した構造とすると水晶発振器となる(例えば、特許文献3参照)。
Such a tuning fork-type bending crystal resonator element 400 is mounted on, for example, an element connection electrode pad formed on the bottom surface of the recess of an element mounting member having a recess having an opening on one main surface, Further, the opening of the recess is hermetically sealed with a lid to form a crystal resonator.
Further, such a tuning fork-type bending crystal resonator element 400 is mounted, for example, on an element connection electrode pad formed on the bottom surface of the recess of an element mounting member having a recess having an opening on one main surface, Further, when the integrated circuit element having at least an oscillation circuit is electrically connected to the mounted tuning-fork type bending crystal vibration element 400 while the opening of the recess is hermetically sealed by a lid, a crystal oscillator is obtained (for example, And Patent Document 3).

特開2008−252800号公報JP 2008-252800 A 特開平10−256868号公報Japanese Patent Laid-Open No. 10-256868 特開2008−301297号公報JP 2008-301297 A

小型化が進んだ音叉型屈曲水晶振動素子では、周波数調整用金属膜の面積も小さくなる。更に、周波数調整用金属膜は、周波数調整における粗調整が施されることにより、更にその面積が小さくなる。このように面積が小さくなった周波数調整用金属膜において、所望する周波数にまで調整できるための金属量を得るためには、周波数調整用金属膜の厚みを厚くして周波数調整用金属膜を構成する金属の量を確保する必要がある。
しかしながら、周波数調整用金属膜の厚みを厚くするためには成膜時間が長時間となり、素子としての製造時間が長くなる恐れがある。又、周波数調整用金属膜は、素子上にマスクを設けて振動腕部の所定の箇所のみに形成されるが、成膜時間が長時間となるとマスキングされている部分の素子表面にまで金属膜の回り込みが発生しやすくなり、この回り込みにより形成された不要な金属膜により、励振用電極間にショートが生じる恐れがある。
In a tuning fork-type bending quartz crystal element that has been miniaturized, the area of the frequency adjusting metal film is also reduced. Furthermore, the area of the metal film for frequency adjustment is further reduced by performing rough adjustment in frequency adjustment. In order to obtain the amount of metal that can be adjusted to a desired frequency in the metal film for frequency adjustment having a reduced area as described above, the metal film for frequency adjustment is configured by increasing the thickness of the metal film for frequency adjustment. It is necessary to secure the amount of metal to be used.
However, in order to increase the thickness of the frequency adjusting metal film, the film formation time becomes long, and the manufacturing time as an element may be long. In addition, the frequency adjusting metal film is formed only on a predetermined portion of the vibrating arm portion by providing a mask on the element. However, if the film formation time becomes long, the metal film extends to the masked portion of the element surface. The wraparound tends to occur, and an unnecessary metal film formed by the wraparound may cause a short circuit between the excitation electrodes.

更に、周波数調整用金属膜の面積が小さくなると、所望の周波数値に微調整するためのイオンビームの照射により減量できる金属の量が少なくなる。このため、所望の周波数値に調整するため照射時間が長くなり、製造時間が長時間になってしまう。又、周波数調整用金属膜に照射されるイオンビームの照射時間が多くなることにより、音叉型屈曲水晶振動素子本体の温度が上昇してしまう。この温度上昇の影響で、周波数調整中に音叉型屈曲水晶振動素子の振動周波数が変化してしまい、所望の周波数値に調整できなくなる恐れがある。   Further, when the area of the frequency adjusting metal film is reduced, the amount of metal that can be reduced by irradiation with an ion beam for fine adjustment to a desired frequency value is reduced. For this reason, since it adjusts to a desired frequency value, irradiation time becomes long and manufacturing time will become long time. In addition, since the irradiation time of the ion beam applied to the frequency adjusting metal film is increased, the temperature of the tuning fork-type bending crystal resonator element body is increased. Due to the effect of this temperature rise, the vibration frequency of the tuning fork-type bending crystal resonator element changes during frequency adjustment, and it may not be possible to adjust to a desired frequency value.

そこで、本発明は、製造時間が短く、且つ所望する周波数に正確に調整することができる音叉型屈曲水晶振動素子を提供することを課題とする。   Therefore, an object of the present invention is to provide a tuning fork-type bending crystal resonator element that can be adjusted to a desired frequency with a short manufacturing time.

前記課題を解決するために本発明は、基部と、前記基部の側面より同一の方向に延びる二本の振動腕部とを備え、前記振動腕部の両主面には溝部が設けられており、前記振動腕部の一方の主面に設けられた前記溝部と前記振動腕部の他方の主面に設けられた前記溝部とは、前記振動腕部の一方の主面に設けられた前記溝部の内部の底面と前記振動腕部の他方の主面に設けられた前記溝部の内部の底面とが前記振動腕部の内部で対向しないように、前記振動腕部の一方の主面に設けられた前記溝部を基部側に、前記振動腕部の他方の主面に設けられた前記溝部を前記振動腕部の先端側に、前記振動腕部の長さ方向に交互にずらして設けられており、前記振動腕部の両主面には励振用電極が設けられており、前記振動腕部の先端部の一方の主面には周波数調整用金属膜が設けられた音叉型屈曲水晶振動素子であって、前記振動腕部の一方の主面に設けられた前記励振用電極の前記振動腕部の先端側の端部は、前記振動腕部の一方の主面に設けられた前記励振用電極の前記振動腕部の先端側の端部よりも、前記基部側に寄って設けられており、前記振動腕部の一方の主面に設けられた前記周波数調整用金属膜の基部側の端部が、前記振動腕部の他方の主面に設けられた前記励振用電極の各振動腕部の先端側の端部よりも、基部側に延出して設けられていることを特徴とする音叉型屈曲水晶振動素子である。   In order to solve the above problems, the present invention includes a base and two vibrating arm portions extending in the same direction from the side surface of the base portion, and groove portions are provided on both main surfaces of the vibrating arm portion. The groove portion provided on one main surface of the vibrating arm portion and the groove portion provided on the other main surface of the vibrating arm portion are the groove portions provided on one main surface of the vibrating arm portion. Provided on one main surface of the vibrating arm portion so that the bottom surface inside the groove portion provided on the other main surface of the vibrating arm portion does not oppose inside the vibrating arm portion. Further, the groove portion provided on the base side and the groove portion provided on the other main surface of the vibrating arm portion are alternately shifted in the length direction of the vibrating arm portion on the distal end side of the vibrating arm portion. Excitation electrodes are provided on both main surfaces of the vibrating arm portion, and one main surface of the tip end portion of the vibrating arm portion is provided. A tuning-fork-type bending quartz crystal resonator element provided with a frequency adjusting metal film, wherein an end portion of the vibration arm portion on the tip side of the excitation electrode provided on one main surface of the vibration arm portion is The excitation electrode provided on one main surface of the vibrating arm portion is provided closer to the base side than the end portion on the distal end side of the vibrating arm portion, and one main surface of the vibrating arm portion The base side end of the frequency adjusting metal film provided on the base is more than the end on the tip side of each vibrating arm of the excitation electrode provided on the other main surface of the vibrating arm. A tuning fork-type bent quartz crystal vibration element characterized by being provided extending to the side.

又、本発明は、溝部が振動腕部の幅方向に平行に並んだ少なくとも2本以上の細溝部で構成されていても良い。   In the present invention, the groove portion may be composed of at least two narrow groove portions arranged in parallel with the width direction of the vibrating arm portion.

このような音叉型屈曲水晶振動素子によれば、従来に比べて面積の大きい周波数調整用金属膜を設けられる。従って、所望する周波数調整量を得るために必要な周波数調整用金属膜の金属量を、従来のように周波数調整膜を厚くすることで確保する必要ない。
よって、周波数調整用金属膜の成膜時間を従来に比べ短くすることができ、素子全体としての製造時間を短縮することができる。又、周波数調整用金属膜の成膜時間が短時間ですむため、金属膜形成時の回り込みの発生を防止でき、この回り込みにより形成された不要な金属膜による励振用電極間のショートが生じる恐れがなくなる。
According to such a tuning-fork type bending crystal resonator element, a metal film for frequency adjustment having a larger area than the conventional one can be provided. Therefore, it is not necessary to secure the metal amount of the frequency adjustment metal film necessary for obtaining a desired frequency adjustment amount by increasing the thickness of the frequency adjustment film as in the prior art.
Therefore, the film formation time of the frequency adjusting metal film can be shortened compared to the conventional case, and the manufacturing time of the entire element can be shortened. In addition, since the time required for forming the metal film for frequency adjustment is short, it is possible to prevent the occurrence of wraparound during the formation of the metal film, and there is a possibility that an unnecessary metal film formed by this wraparound causes a short circuit between the excitation electrodes. Disappears.

更に、周波数調整用金属膜の面積を従来に比べて大きくできるので、イオンビームの照射で減量できる金属の量が大きくなる。よって、イオンビームの照射時間が短くてすみ、周波数調整に係る時間を短縮することができる。
又、周波数調整用金属膜に照射されるイオンビームの照射時間が少なくなることにより、音叉型屈曲水晶振動素子本体の温度上昇を抑制できる。従って、周波数調整中に音叉型屈曲水晶振動素子の振動周波数が変化することがなく、所望する周波数値に調整できる。
Furthermore, since the area of the frequency adjusting metal film can be increased as compared with the conventional case, the amount of metal that can be reduced by ion beam irradiation is increased. Accordingly, the irradiation time of the ion beam can be shortened, and the time for frequency adjustment can be shortened.
Further, since the irradiation time of the ion beam applied to the frequency adjusting metal film is reduced, it is possible to suppress the temperature rise of the tuning fork-type bending crystal resonator element body. Therefore, the vibration frequency of the tuning fork-type bending crystal resonator element does not change during the frequency adjustment, and can be adjusted to a desired frequency value.

よって、本発明は、製造時間が短く、且つ所望する周波数に正確に調整することができる音叉型屈曲水晶振動素子を提供できる効果を奏する。   Therefore, the present invention has an effect that it is possible to provide a tuning-fork type bending crystal vibrating element that can be adjusted to a desired frequency with a short manufacturing time.

本発明の第一の実施形態に係る音叉型屈曲水晶振動素子の一例を示す斜視図である。It is a perspective view which shows an example of the tuning fork type bending crystal vibration element which concerns on 1st embodiment of this invention. 本発明の第一の実施形態に係る音叉型屈曲水晶振動素子を構成する水晶片の一例を示す平面図であり、(a)は一方の主面上から見た図であり、(b)は他方の主面上から見た図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows an example of the crystal piece which comprises the tuning fork type bending crystal vibration element which concerns on 1st embodiment of this invention, (a) is the figure seen from one main surface, (b) is It is the figure seen from the other main surface. 本発明の第一の実施形態に係る音叉型屈曲水晶振動素子の一例を示す平面図であり、(a)は一方の主面上から見た図であり、(b)は他方の主面上から見た図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows an example of the tuning fork type bending crystal vibration element which concerns on 1st embodiment of this invention, (a) is the figure seen from one main surface, (b) is on the other main surface. It is the figure seen from. 本発明の第一の実施形態に係る音叉型屈曲水晶振動素子の変形例を示す斜視図である。It is a perspective view which shows the modification of the tuning fork type bending crystal vibration element which concerns on 1st embodiment of this invention. 本発明の第一の実施形態に係る音叉型屈曲水晶振動素子の変形例を示す平面図であり、(a)は一方の主面上から見た図であり、(b)は他方の主面上から見た図である。It is a top view which shows the modification of the tuning fork type bending crystal vibration element which concerns on 1st embodiment of this invention, (a) is the figure seen from one main surface, (b) is the other main surface It is the figure seen from the top. 本発明の第二の実施形態に係る音叉型屈曲水晶振動素子を構成する水晶片の一例を示す平面図であり、(a)は一方の主面上から見た図であり、(b)は他方の主面上から見た図である。It is a top view which shows an example of the crystal piece which comprises the tuning fork type bending crystal vibration element which concerns on 2nd embodiment of this invention, (a) is the figure seen from one main surface, (b) It is the figure seen from the other main surface. 従来の音叉型屈曲水晶振動素子の一例を示す斜視図である。It is a perspective view which shows an example of the conventional tuning fork type bending crystal vibration element. 従来の音叉型屈曲水晶振動素子を構成する水晶片の一例を示す平面図であり、(a)は一方の主面上からみた図であり、(b)は他方の主面上から見た図である。It is a top view which shows an example of the crystal piece which comprises the conventional tuning fork type bending crystal vibration element, (a) is the figure seen from one main surface, (b) is the figure seen from the other main surface It is. 従来の音叉型屈曲水晶振動素子の一例を示す平面図であり、(a)は一方の主面上からみた図であり、(b)は他方の主面上から見た図である。It is a top view which shows an example of the conventional tuning fork type bending crystal vibration element, (a) is the figure seen from one main surface, (b) is the figure seen from the other main surface.

本発明を実施するための形態(以下、「実施形態」という。)について、適宜図面を参照しながら詳細に説明する。尚、各構成要素について状態をわかりやすくするために、誇張して図示している。特に図3、図5における音叉型屈曲振動素子の側面に設けられた電極の厚みは、著しく誇張して図示している。   A mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the drawings as appropriate. Note that each component is exaggerated for easy understanding of the state. In particular, the thickness of the electrode provided on the side surface of the tuning-fork type bending vibration element in FIGS. 3 and 5 is exaggerated greatly.

(第一の実施形態)
図1及び図3に示すように、音叉型屈曲水晶振動素子100は、水晶片110(図2を参照)と、その水晶片110の表面に設けられた励振用電極121a,121b,121c,121d,122a,122b,122c及び122dと、接続用電極123a及び123bと、周波数調整用金属膜124a及び124bと、導配線パターン125a,125b,125c,125d,125e及び125fとにより概略構成される。
(First embodiment)
As shown in FIGS. 1 and 3, the tuning-fork type bending crystal resonator element 100 includes a crystal piece 110 (see FIG. 2) and excitation electrodes 121a, 121b, 121c, and 121d provided on the surface of the crystal piece 110. , 122a, 122b, 122c and 122d, connection electrodes 123a and 123b, frequency adjusting metal films 124a and 124b, and conductive wiring patterns 125a, 125b, 125c, 125d, 125e and 125f.

図2に示すように、水晶片110は、基部111と、第一の振動腕部112aと、第二の振動腕部112bとからなる。基部111は、結晶の軸方向として電気軸がX軸、機械軸がY軸、及び光軸がZ軸となる直交座標系としたとき、X軸周りに−5°〜+5°の範囲内で回転させたZ′軸の方向が厚み方向となる平面視略四角形の平板である。第一の振動腕部112a及び第二の振動腕部112bは、基部111の一辺からY′軸の方向に平行に延出して設けられている。   As shown in FIG. 2, the crystal piece 110 includes a base portion 111, a first vibrating arm portion 112a, and a second vibrating arm portion 112b. When the base 111 is an orthogonal coordinate system in which the electrical axis is the X axis, the mechanical axis is the Y axis, and the optical axis is the Z axis as the crystal axis direction, the base 111 is within a range of −5 ° to + 5 ° around the X axis. This is a flat plate having a substantially rectangular shape in a plan view in which the direction of the rotated Z ′ axis is the thickness direction. The first vibrating arm portion 112a and the second vibrating arm portion 112b are provided so as to extend from one side of the base portion 111 in parallel to the Y′-axis direction.

尚、基部111の表面積の最も広く形成されている面であって一方の面と他方の面とが平行となった2つの面を、基部111の両主面という。又、これら2つの面と同一の方向を向く第一の振動腕部112aと第二の振動腕部112bの面も両主面という。図1において、図面で現われている面を「一方の主面」とし、隠れている面を「他方の主面」とする。又、図2において、(a)に図示した面を「一方の主面」とし、(b)に図示した面を「他方の主面」とする。   Note that the two surfaces having the largest surface area of the base 111 and having one surface parallel to the other surface are referred to as both main surfaces of the base 111. The surfaces of the first vibrating arm portion 112a and the second vibrating arm portion 112b that face the same direction as these two surfaces are also referred to as both main surfaces. In FIG. 1, a surface appearing in the drawing is referred to as “one main surface” and a hidden surface is referred to as “the other main surface”. Further, in FIG. 2, the surface illustrated in (a) is referred to as “one main surface”, and the surface illustrated in (b) is referred to as “the other main surface”.

図2に示すように、第一の振動腕部112aには、一方の主面に開口部を有し且つその開口部の長辺が第一の振動腕部112aの長さ方向に沿っている第一の溝部113aと、他方の主面に開口部を有し且つその開口部の長辺が第一の振動腕部112aの長さ方向に沿っている第二の溝部113bとが設けられている。この第一の溝部113aと第二の溝部113bとは、第一の溝部113aの内部の底面と第二の溝部113bの内部の底面とが第一の振動腕部112aの内部で対向しないように、第一の溝部113aを基部111側に、第二の溝部113bを第一の振動腕部112aの先端側に、第一の振動腕部112aの長さ方向に交互にずらして設けられている。   As shown in FIG. 2, the first vibrating arm portion 112a has an opening on one main surface, and the long side of the opening is along the length direction of the first vibrating arm portion 112a. A first groove 113a and a second groove 113b having an opening on the other main surface and having a long side of the opening along the length direction of the first vibrating arm 112a are provided. Yes. The first groove 113a and the second groove 113b are arranged so that the bottom surface inside the first groove 113a and the bottom surface inside the second groove 113b do not face each other inside the first vibrating arm portion 112a. The first groove 113a is provided on the base 111 side, and the second groove 113b is provided on the distal end side of the first vibrating arm part 112a while being alternately shifted in the length direction of the first vibrating arm part 112a. .

又、第二の振動腕部112bには、一方の主面に開口部を有し且つ開口部の長辺が第二の振動腕部112bの長さ方向に沿っている第三の溝部113cと、他方の主面に開口部を有し且つ開口部の長辺が第二の振動腕部112bの長さ方向に沿っている第四の溝部113dとが設けられている。この第三の溝部113cと第四の溝部113dとは、第三の溝部113c内の底面と第四の溝部113d内の底面とが第二の振動腕部112b内部で対向しないように、第三の溝部113cを基部111側に、第四の溝部113dを第二の振動腕部112bの先端側に、第二の振動腕部112bの長さ方向に交互にずらして設けられている。   The second vibrating arm portion 112b includes a third groove 113c having an opening on one main surface and having a long side along the length direction of the second vibrating arm portion 112b. A fourth groove 113d having an opening on the other main surface and having a long side of the opening along the length direction of the second vibrating arm 112b is provided. The third groove portion 113c and the fourth groove portion 113d are arranged so that the bottom surface in the third groove portion 113c and the bottom surface in the fourth groove portion 113d do not face each other inside the second vibrating arm portion 112b. The groove 113c is provided on the base 111 side, and the fourth groove 113d is provided on the distal end side of the second vibrating arm part 112b while being alternately shifted in the length direction of the second vibrating arm part 112b.

図1及び図3に示すように、励振用電極121aは、水晶片110を構成する第一の振動腕部112aの一方の主面に設けられている。励振用電極121bは、第一の振動腕部112aの他方の主面に設けられている。励振用電極121cは、第一の振動腕部112aの第二の振動腕部112b側を向いた側面に設けられている。励振用電極121dは、第一の振動腕部112aの励振用電極121cが設けられた側面の反対側の側面に設けられている。励振用電極121bの第一の振動腕部112aの先端側の端部は、第二の溝部113bの第一の振動腕部112aの先端側の端部と重なる位置に設けられている。励振用電極121aの第一の振動腕部112aの先端側の端部は、励振用電極121bの第一の振動腕部112aの先端側の端部よりも、基部111側に寄って設けられている。つまり、励振用電極121aの長さは、励振用電極121bの長さに比べて短くなっている。   As shown in FIGS. 1 and 3, the excitation electrode 121 a is provided on one main surface of the first vibrating arm portion 112 a constituting the crystal piece 110. The excitation electrode 121b is provided on the other main surface of the first vibrating arm portion 112a. The excitation electrode 121c is provided on a side surface of the first vibrating arm portion 112a facing the second vibrating arm portion 112b. The excitation electrode 121d is provided on the side surface opposite to the side surface on which the excitation electrode 121c of the first vibrating arm portion 112a is provided. The end of the first vibrating arm 112a of the excitation electrode 121b is provided at a position overlapping the end of the first vibrating arm 112a of the second groove 113b. The end on the distal end side of the first vibrating arm portion 112a of the excitation electrode 121a is provided closer to the base 111 side than the end portion on the distal end side of the first vibrating arm portion 112a of the excitation electrode 121b. Yes. That is, the length of the excitation electrode 121a is shorter than the length of the excitation electrode 121b.

又、励振用電極121c及び121dの第一の振動腕部112aの先端側の端部は、励振用電極121aの第一の振動腕部112aの先端側よりも第一の振動腕部112aの先端側で、且つ励振用電極121bの第一の振動腕部112aの先端側の端部よりも基部111側となるような位置に設けられている。又、励振用電極121cと121dの第一の振動腕部112aの先端側の端部は、配線パターン125aにより電気的に接続している。この配線パターン125aは、第一の振動腕部112aの一方の主面における、励振用電極121aの第一の振動腕部112aの先端側の端部から所定の間隔を空けた位置に設けられている。   In addition, the end of the first vibrating arm portion 112a of the first vibrating arm portion 112a of the exciting electrodes 121c and 121d is more distal than the distal end side of the first vibrating arm portion 112a of the exciting electrode 121a. And on the side of the base 111 from the end of the first vibrating arm 112a of the excitation electrode 121b. The ends of the first vibrating arm portions 112a of the excitation electrodes 121c and 121d are electrically connected by a wiring pattern 125a. The wiring pattern 125a is provided at a position on the one main surface of the first vibrating arm portion 112a at a predetermined distance from the end of the first vibrating arm portion 112a of the excitation electrode 121a on the front end side. Yes.

又、図1及び図3に示すように、励振用電極122aは、水晶片110を構成する第二の振動腕部112bの一方の主面に設けられている。励振用電極122bは、第二の振動腕部112bの他方の主面に設けられている。励振用電極122cは、第二の振動腕部112bの第一の振動腕部112a側を向いた側面に設けられている。励振用電極122dは、第二の振動腕部112bの励振用電極122cが設けられた側面の反対側の側面に設けられている。励振用電極122bの第二の振動腕部112bの先端側の端部は、第四の溝部113dの第二の振動腕部112bの先端側の端部と重なる位置に設けられている。励振用電極122aの第二の振動腕部112bの先端側の端部は、励振用電極122bの第二の振動腕部112bの先端側の端部よりも、基部111側に寄って設けられている。つまり、励振用電極122aの長さは、励振用電極122bの長さに比べて短くなっている。   As shown in FIGS. 1 and 3, the excitation electrode 122 a is provided on one main surface of the second vibrating arm portion 112 b constituting the crystal piece 110. The excitation electrode 122b is provided on the other main surface of the second vibrating arm portion 112b. The excitation electrode 122c is provided on the side surface of the second vibrating arm portion 112b facing the first vibrating arm portion 112a. The excitation electrode 122d is provided on the side surface opposite to the side surface on which the excitation electrode 122c of the second vibrating arm portion 112b is provided. The end of the second vibrating arm portion 112b of the excitation electrode 122b is provided at a position overlapping the end of the fourth groove 113d on the leading end side of the second vibrating arm portion 112b. The end portion on the distal end side of the second vibrating arm portion 112b of the excitation electrode 122a is provided closer to the base 111 side than the end portion on the distal end side of the second vibrating arm portion 112b of the excitation electrode 122b. Yes. That is, the length of the excitation electrode 122a is shorter than the length of the excitation electrode 122b.

更に、励振用電極122c及び122dの第二の振動腕部112bの先端側の端部は、励振用電極122aの第二の振動腕部112bの先端側よりも第二の振動腕部112bの先端側で、且つ励振用電極122bの第二の振動腕部112bの先端側の端部よりも基部111側となるような位置に設けられている。又、励振用電極122cと122dの第二の振動腕部112bの先端側の端部は、配線パターン125bにより電気的に接続している。この配線パターン125bは、第二の振動腕部112bの一方の主面における、励振用電極122aの第二の振動腕部112bの先端側の端部から所定の間隔を空けた位置に設けられている。   Furthermore, the end of the second vibrating arm 112b of the excitation electrodes 122c and 122d is more distal than the distal end of the second vibrating arm 112b of the exciting electrode 122a. And on the side of the base 111 from the end of the second vibrating arm 112b of the excitation electrode 122b. The ends of the second vibrating arm portions 112b of the excitation electrodes 122c and 122d are electrically connected by a wiring pattern 125b. The wiring pattern 125b is provided at a position on the one main surface of the second vibrating arm portion 112b at a predetermined distance from the end of the second vibrating arm portion 112b of the excitation electrode 122a on the front end side. Yes.

接続用電極123aは、基部111の幅方向において第一の振動腕部112aに近い側の両主面に対向させて設けられている。この接続用電極123aは励振用電極121dと電気的に接続している。又、この接続用電極123aは、基部111の一方の主面に設けられた導配線パターン125cと、励振用電極121cを介して基部111の他方の主面に設けられた導配線パターン125dとにより、第二の振動腕部112bの励振用電極122a及び122bとも電気的に接続している。   The connection electrode 123 a is provided to face both main surfaces on the side close to the first vibrating arm portion 112 a in the width direction of the base portion 111. The connection electrode 123a is electrically connected to the excitation electrode 121d. The connection electrode 123a includes a conductive wiring pattern 125c provided on one main surface of the base 111 and a conductive wiring pattern 125d provided on the other main surface of the base 111 via the excitation electrode 121c. The excitation electrodes 122a and 122b of the second vibrating arm portion 112b are also electrically connected.

接続用電極123bは、基部111の幅方向において第二の振動腕部112bに近い側の両主面に対向させて設けられている。この接続用電極123bは励振用電極122dと電気的に接続している。又、この接続用電極123bは、基部111の他方の主面に設けられた導配線パターン125eと、励振用電極122cを介して基部111の一方の主面に設けられた導配線パターン125fとにより、第一の振動腕部112aの励振用電極121a及び121bと電気的に接続している。   The connection electrode 123b is provided to face both main surfaces on the side close to the second vibrating arm portion 112b in the width direction of the base portion 111. The connection electrode 123b is electrically connected to the excitation electrode 122d. The connection electrode 123b is composed of a conductive wiring pattern 125e provided on the other main surface of the base 111 and a conductive wiring pattern 125f provided on one main surface of the base 111 via the excitation electrode 122c. The first vibrating arm portion 112a is electrically connected to the excitation electrodes 121a and 121b.

周波数調整用金属膜124aは、第一の振動腕部112aの先端部の一方の主面と両側面に設けられている。この一方の主面に設けられた周波数調整用金属膜124aの基部111側の端部は配線パターン125aと接しており、第一の振動腕部112aの先端側の端部は第一の振動腕部112aの先端縁部に設けられている。つまり、周波数調整用金属膜124aの基部111側の端部は、第一の振動腕部112aの他方の主面に設けられた励振用電極121bの第一の振動腕部112aの先端側の端部よりも、基部111側に延出して設けられているので、周波数調整用金属膜124aの面積が従来技術における第一の振動腕部の一方の主面に設けられた周波数調整用金属膜の面積に比べ大きくなっている。   The frequency adjusting metal film 124a is provided on one main surface and both side surfaces of the distal end portion of the first vibrating arm portion 112a. The end on the base 111 side of the frequency adjusting metal film 124a provided on the one main surface is in contact with the wiring pattern 125a, and the end on the tip side of the first vibrating arm 112a is the first vibrating arm. It is provided at the front end edge of the portion 112a. That is, the end on the base 111 side of the frequency adjusting metal film 124a is the end on the distal end side of the first vibrating arm 112a of the excitation electrode 121b provided on the other main surface of the first vibrating arm 112a. Since the area of the frequency adjustment metal film 124a is provided on one main surface of the first vibrating arm portion in the prior art, the area of the frequency adjustment metal film 124a is extended to the base 111 side than the portion. It is larger than the area.

又、周波数調整用金属膜124bは、第二の振動腕部112bの先端部の一方の主面及び両側面に設けられている。この一方の主面に設けられた周波数調整用金属膜124bの基部111側の端部は配線パターン125bと接しており、第二の振動腕部112bの先端側の端部は第二の振動腕部112bの先端縁部に設けられている。つまり、周波数調整用金属膜124bの基部111側の端部は、第二の振動腕部112bの他方の主面に設けられた励振用電極122bの第二の振動腕部112bの先端側の端部よりも、基部111側に延出して設けられているので、周波数調整用金属膜124bの面積が、従来技術における第二の振動腕部の一方の主面に設けられた周波数調整用金属膜の面積に比べ大きくなっている。   The frequency adjusting metal film 124b is provided on one main surface and both side surfaces of the distal end portion of the second vibrating arm portion 112b. The end portion on the base 111 side of the frequency adjusting metal film 124b provided on the one main surface is in contact with the wiring pattern 125b, and the end portion on the distal end side of the second vibrating arm portion 112b is the second vibrating arm. It is provided at the front end edge of the portion 112b. That is, the end of the frequency adjusting metal film 124b on the base 111 side is the end of the second vibrating arm 112b of the excitation electrode 122b provided on the other main surface of the second vibrating arm 112b. The frequency adjusting metal film 124b is provided on one main surface of the second vibrating arm portion in the prior art because the area of the frequency adjusting metal film 124b is provided so as to extend to the base 111 side than the portion. It is larger than the area.

尚、この音叉型屈曲水晶振動素子100の周波数調整は、第一の振動腕部112a及び第二の振動腕部112bの一方の主面に設けられた周波数調整用金属膜124a及び124bの一部をレーザ等で取り除くことにより周波数の粗調整を行う。その後、残った周波数調整用金属膜124a及び124bにイオンビームを照射し、周波数調整用金属膜124a及び124bを構成する金属を減量させて、音叉型屈曲水晶振動素子の周波数を所望の値に微調整する。又、本実施形態において、各励振用電極、接続用電極、周波数調整用金属膜、導配線パターンは、例えば、下地金属としてのCr層と、その下地金属の上に重ねて設けられたAu層とから構成されている。   The frequency adjustment of the tuning-fork type bending crystal resonator element 100 is performed by a part of the frequency adjusting metal films 124a and 124b provided on one main surface of the first vibrating arm portion 112a and the second vibrating arm portion 112b. The frequency is roughly adjusted by removing the laser beam with a laser or the like. Thereafter, the remaining frequency adjusting metal films 124a and 124b are irradiated with an ion beam to reduce the amount of the metal constituting the frequency adjusting metal films 124a and 124b, so that the frequency of the tuning fork type bending crystal vibrating element is reduced to a desired value. adjust. Further, in this embodiment, each excitation electrode, connection electrode, frequency adjusting metal film, and conductive wiring pattern are, for example, a Cr layer as a base metal and an Au layer provided on the base metal. It consists of and.

この音叉型屈曲水晶振動素子100を振動させる場合、接続用電極123a及び123bに交番電圧を印加する。印加後のある電気的状態を瞬間的にとらえると、例えば、第一の振動腕部112bの励振用電極121c及び121dは+(プラス)電位となり、励振用電極121a及び121bは−(マイナス)電位となり、+から−に電界が生じる。一方、このときの第二の振動腕部112bの各励振用電極は、第一の振動腕部112aの励振用電極に生じた極性とは反対の極性となる。これらの印加された電界により、第一の振動腕部112a及び第二の振動腕部112bに伸縮現象が生じ、第一の振動腕部112a及び第二の振動腕部112bに設定した共振周波数の屈曲振動を得る。   When this tuning fork type bending crystal resonator element 100 is vibrated, an alternating voltage is applied to the connection electrodes 123a and 123b. When an electrical state after application is instantaneously captured, for example, the excitation electrodes 121c and 121d of the first vibrating arm portion 112b have a positive (+) potential, and the excitation electrodes 121a and 121b have a negative (-) potential. Thus, an electric field is generated from + to-. On the other hand, each excitation electrode of the second vibrating arm portion 112b at this time has a polarity opposite to the polarity generated in the exciting electrode of the first vibrating arm portion 112a. These applied electric fields cause expansion and contraction phenomenon in the first vibrating arm portion 112a and the second vibrating arm portion 112b, and the resonance frequency set in the first vibrating arm portion 112a and the second vibrating arm portion 112b. Get flexural vibration.

音叉型屈曲水晶振動素子100は、水晶片110の表面に、前記した励振用電極、接続用電極、導配線パターン及び周波数調整用金属膜をフォトリソグラフィ技術及び成膜技術により形成することができる。又、音叉型屈曲水晶振動素子100は、例えば、一方の主面に開口部を有する凹部を設けた素子搭載部材の、その凹部内底面に形成された素子接続用電極パッド上に搭載され、更に凹部の開口部が蓋体により気密封止されて水晶振動子となる。   The tuning fork-type bending crystal resonator element 100 can form the excitation electrode, the connection electrode, the conductive wiring pattern, and the frequency adjusting metal film on the surface of the crystal piece 110 by a photolithography technique and a film formation technique. Further, the tuning fork-type bending crystal resonator element 100 is mounted on, for example, an element connection electrode pad formed on the bottom surface in the concave portion of an element mounting member provided with a concave portion having an opening on one main surface. The opening of the recess is hermetically sealed by the lid to form a crystal resonator.

このような音叉型屈曲水晶振動素子100によれば、従来に比べて面積の大きい周波数調整用金属膜124a及び124bを設けられる。従って、所望する周波数調整量を得るために必要な周波数調整用金属膜の金属量を、従来のように周波数調整膜を厚くすることで確保する必要ない。よって、周波数調整用金属膜124a及び124bの成膜時間を従来に比べ短くすることができ、素子全体としての製造時間を短縮することができる。又、周波数調整用金属膜124a及び124bの成膜時間が短時間ですむため、金属膜形成時の回り込みの発生を防止でき、この回り込みにより形成された不要な金属膜による励振用電極間のショートが生じる恐れがなくなる。   According to such a tuning-fork type bending crystal resonator element 100, the frequency adjusting metal films 124a and 124b having a larger area than the conventional one can be provided. Therefore, it is not necessary to secure the metal amount of the frequency adjustment metal film necessary for obtaining a desired frequency adjustment amount by increasing the thickness of the frequency adjustment film as in the prior art. Therefore, the film formation time of the frequency adjusting metal films 124a and 124b can be shortened compared to the conventional case, and the manufacturing time of the entire device can be shortened. Further, since the time required for forming the frequency adjusting metal films 124a and 124b is short, it is possible to prevent the occurrence of wraparound during the formation of the metal film, and a short circuit between the excitation electrodes due to unnecessary metal films formed by the wraparound. There is no fear of the occurrence.

更に、周波数調整用金属膜124a及び124bの面積を従来に比べ大きくできるので、イオンビームの照射で減量できる金属の量が大きくなる。よって、イオンビームの照射時間が短くてすみ、周波数調整に係る時間を短縮することができる。
又、周波数調整用金属膜124a及び124bに照射されるイオンビームの照射時間が少なくなることにより、音叉型屈曲水晶振動素子100本体の温度上昇を抑制できる。従って、周波数調整中に音叉型屈曲水晶振動素子100の振動周波数が変化することがなく、所望する周波数値に調整できる。
Furthermore, since the area of the frequency adjusting metal films 124a and 124b can be increased as compared with the conventional case, the amount of metal that can be reduced by ion beam irradiation is increased. Accordingly, the irradiation time of the ion beam can be shortened, and the time for frequency adjustment can be shortened.
Further, since the irradiation time of the ion beam applied to the frequency adjusting metal films 124a and 124b is reduced, it is possible to suppress the temperature rise of the main body of the tuning-fork type bending crystal resonator element 100. Therefore, the vibration frequency of the tuning fork-type bending crystal resonator element 100 does not change during frequency adjustment, and can be adjusted to a desired frequency value.

(変形例)
図4及び図5は、本発明の第一の実施形態に係る音叉型屈曲水晶振動素子の変形例を示す。本発明の第一の実施形態に係る音叉型屈曲水晶振動素子の第一の変形例は、以下のような構成となっている。
励振用電極121aの第一の振動腕部112aの先端側の端部は、第一の溝部113aの第一の振動腕部112aの先端側の端部に対応した位置に設けられている。配線パターン125aは、この励振用電極121aの第一の振動腕部112aの先端側の端部から所定の間隔を空けて設けられており、励振用電極121cと励振用電極121dとを電気的に接続している。第一の振動腕部112aの周波数調整用金属膜124aは、基部111側の端部がこの配線パターン125aと接するように、基部111の方向に更に延出して設けられている。
(Modification)
4 and 5 show a modification of the tuning fork-type bending crystal resonator element according to the first embodiment of the present invention. A first modification of the tuning fork-type bending crystal resonator element according to the first embodiment of the present invention has the following configuration.
The end of the first vibrating arm 112a of the excitation electrode 121a is provided at a position corresponding to the tip of the first vibrating arm 112a of the first groove 113a. The wiring pattern 125a is provided at a predetermined interval from the tip end of the first vibrating arm portion 112a of the excitation electrode 121a, and electrically connects the excitation electrode 121c and the excitation electrode 121d. Connected. The frequency adjusting metal film 124a of the first vibrating arm portion 112a is further extended in the direction of the base portion 111 so that the end portion on the base portion 111 side is in contact with the wiring pattern 125a.

励振用電極122aの第二の振動腕部112bの先端側の端部は、第三の溝部113cの第二の振動腕部112bの先端側の端部に対応した位置に設けられている。配線パターン125bは、この励振用電極122aの第二の振動腕部112bの先端側の端部から所定の間隔を空けて設けられており、励振用電極122cと励振用電極122dとを電気的に接続している。周波数調整用金属膜124bは、その長さ方向の基部111側の一方の端部が配線パターン125bと接するように、基部111の方向に更に延出して設けられている。   The end portion on the distal end side of the second vibrating arm portion 112b of the excitation electrode 122a is provided at a position corresponding to the end portion on the distal end side of the second vibrating arm portion 112b of the third groove portion 113c. The wiring pattern 125b is provided at a predetermined interval from the tip end of the second vibrating arm portion 112b of the excitation electrode 122a, and electrically connects the excitation electrode 122c and the excitation electrode 122d. Connected. The frequency adjusting metal film 124b is provided so as to further extend in the direction of the base 111 so that one end on the base 111 side in the length direction is in contact with the wiring pattern 125b.

この変形例では、第一の振動腕部112a及び第二の振動腕部112bの一方の主面に更に大きな周波数調整用金属膜124a及び124bが設けられている。従って、このような音叉型屈曲水晶振動素子の変形例を構成しても、本発明の第一の実施形態と同様の効果を奏する。   In this modification, larger frequency adjusting metal films 124a and 124b are provided on one main surface of the first vibrating arm portion 112a and the second vibrating arm portion 112b. Therefore, even if such a modification of the tuning fork type quartz crystal vibrating element is configured, the same effects as those of the first embodiment of the present invention can be obtained.

(第二の実施形態)
図6は、本発明の第二の実施形態に係る音叉型屈曲水晶振動素子を構成する水晶片を示す平面図である。本発明の第二の実施形態に係る音叉型屈曲水晶振動素子は、第一の実施形態に比べて、第一の溝部、第二の溝部、第三の溝部、及び第四の溝部の形状が異なっている。
図6に示すように、本発明の第二の実施形態に係る音叉型屈曲水晶振動素子を構成する水晶片210は、基部111と、この基部111から延出する第一の振動腕部112aと第二の振動腕部112bとを備えている。
(Second embodiment)
FIG. 6 is a plan view showing a crystal piece constituting a tuning fork-type bending crystal resonator element according to the second embodiment of the present invention. The tuning fork type bending quartz crystal resonator element according to the second embodiment of the present invention has a first groove portion, a second groove portion, a third groove portion, and a fourth groove portion as compared with the first embodiment. Is different.
As shown in FIG. 6, the crystal piece 210 constituting the tuning fork-type bending crystal resonator element according to the second embodiment of the present invention includes a base portion 111 and a first vibrating arm portion 112 a extending from the base portion 111. A second vibrating arm portion 112b.

第一の振動腕部112aの一方の主面には、第一の振動腕部112aの幅方向に並んだ2本一対の細溝部214aで構成された第一の溝部213aが設けられている。又、第一の振動腕部112aの他方の主面には、第一の振動腕部112aの幅方向に並んだ2本一対の細溝部214bで構成された第二の溝部213bが設けられている。この第一の溝部213aと第二の溝部213bとは、各細溝部214aの底面と各細溝部214b内の底面とが、第一の振動腕部112a内部で対向しないように、第一の溝部213aを基部111側に、第二の溝部213bを第一の振動腕部112aの先端側に、第一の振動腕部112aの長さ方向に交互にずらして設けられている。   One main surface of the first vibrating arm portion 112a is provided with a first groove portion 213a including a pair of narrow groove portions 214a arranged in the width direction of the first vibrating arm portion 112a. Further, the second main surface of the first vibrating arm portion 112a is provided with a second groove portion 213b composed of a pair of two narrow groove portions 214b arranged in the width direction of the first vibrating arm portion 112a. Yes. The first groove portion 213a and the second groove portion 213b are formed so that the bottom surface of each narrow groove portion 214a and the bottom surface in each narrow groove portion 214b do not face each other inside the first vibrating arm portion 112a. 213a is provided on the base 111 side, and the second groove 213b is provided on the distal end side of the first vibrating arm portion 112a while being alternately shifted in the length direction of the first vibrating arm portion 112a.

又、第二の振動腕部112bの一方の主面には、第二の振動腕部112bの幅方向に並んだ2本一対の細溝部214cで構成された第三の溝部213cが設けられている。又、第二の振動腕部112bの他方の主面には、第二の振動腕部112bの幅方向に並んだ2本一対の細溝部214dで構成された第四の溝部213dが設けられている。この第三の溝部213cと第四の溝部213dとは、各細溝部214cの底面と各細溝部214d内の底面とが、第二の振動腕部112b内部で対向しないように、第三の溝部213cを基部111側に、第四の溝部213dを第二の振動腕部112bの先端側に、第二の振動腕部112bの長さ方向に交互にずらして設けられている。   In addition, a third groove portion 213c including a pair of two narrow groove portions 214c arranged in the width direction of the second vibrating arm portion 112b is provided on one main surface of the second vibrating arm portion 112b. Yes. The other main surface of the second vibrating arm portion 112b is provided with a fourth groove portion 213d composed of a pair of two narrow groove portions 214d arranged in the width direction of the second vibrating arm portion 112b. Yes. The third groove portion 213c and the fourth groove portion 213d are arranged so that the bottom surface of each narrow groove portion 214c and the bottom surface in each narrow groove portion 214d do not face each other inside the second vibrating arm portion 112b. 213c is provided on the base 111 side, and fourth grooves 213d are provided on the distal end side of the second vibrating arm portion 112b, being alternately shifted in the length direction of the second vibrating arm portion 112b.

第二の実施形態に係る音叉型屈曲水晶振動素子は、このような構成の水晶片210に、第一の実施形態と同様な励振用電極、接続用電極、周波数調整用金属膜及び配線パターンを設けることによりなる。このような構成の第二の実施形態に係る音叉型屈曲水晶振動素子においても、第一の実施形態と同様の作用効果を奏することができる。   The tuning fork-type bending quartz crystal resonator element according to the second embodiment is provided with an excitation electrode, a connection electrode, a frequency adjustment metal film, and a wiring pattern similar to those of the first embodiment on the crystal piece 210 having such a configuration. It becomes by providing. The tuning fork-type bent quartz crystal resonator element according to the second embodiment having such a configuration can also provide the same effects as those of the first embodiment.

尚、本発明の実施形態について説明したが、本発明は、適宜、変更可能である。
例えば、本実施形態では、基部として平面視略四角形の形状とし、その基部で音叉型屈曲水晶振動素子を支持する構成を開示したが、別の形態として、この基部から延出して設けられた突起部を設け、その突起部において音叉型屈曲水晶振動子を支持する構成としても良い。又、基部の平面視形状についても、本発明の効果を奏するのであれば、本実施形態に開示したものに限定されるものではない。
又、本実施形態では各振動腕部の一方の主面及び両側面に周波数調整用金属膜を設けた構成を開示したが、各振動腕部の両主面及び両側面に周波数調整用金属膜を設けた構成でも構わない。
又、本実施形態では、励振用電極、接続用電極及び配線パターンと周波数調整用金属膜とを同じ金属で設けた構成を示したが、周波数調整用金属膜を励振用電極、接続用電極及び配線パターンとは異なる金属で設けても良い。その場合は、周波数調整用金属膜の基部側の端部と、各振動腕部の両側面に設けられた励振用電極及びそれを電気的に接続している配線パターンとの間に、所定の間隔を空けておくことが望ましい。
又、前記した本実施形態では、水晶片を用いた場合を説明したが、他の圧電素材として、ニオブ酸リチウム、タンタル酸リチウム又は、圧電セラミックスを圧電素材として用いた圧電振動素子でも構わない。
In addition, although embodiment of this invention was described, this invention can be changed suitably.
For example, in the present embodiment, a configuration in which the base portion has a substantially square shape in plan view and the tuning fork type quartz crystal vibrating element is supported by the base portion is disclosed, but as another embodiment, a protrusion provided to extend from the base portion It is good also as a structure which provides a part and supports a tuning fork type | mold bending crystal oscillator in the projection part. Also, the shape of the base in plan view is not limited to the one disclosed in the present embodiment as long as the effect of the present invention is achieved.
Further, in the present embodiment, the configuration in which the frequency adjusting metal film is provided on one main surface and both side surfaces of each vibrating arm portion is disclosed. However, the frequency adjusting metal film is provided on both main surfaces and both side surfaces of each vibrating arm portion. A configuration provided with
Further, in the present embodiment, the configuration in which the excitation electrode, the connection electrode, the wiring pattern, and the frequency adjustment metal film are provided with the same metal is shown. However, the frequency adjustment metal film is provided with the excitation electrode, the connection electrode, and the frequency adjustment metal film. You may provide with the metal different from a wiring pattern. In that case, between the end on the base side of the metal film for frequency adjustment and the excitation electrodes provided on both side surfaces of each vibrating arm and the wiring pattern electrically connecting them, a predetermined It is desirable to leave an interval.
In the above-described embodiment, the case where the crystal piece is used has been described. However, as another piezoelectric material, a piezoelectric vibration element using lithium niobate, lithium tantalate, or piezoelectric ceramics as the piezoelectric material may be used.

100・・・音叉型屈曲水晶振動素子
110,210・・・水晶片
111・・・基部
112a・・・第一の振動腕部
112b・・・第二の振動腕部
113a,213a・・・第一の溝部
113b,213b・・・第二の溝部
113c,213c・・・第三の溝部
113d,213d・・・第四の溝部
121a,121b,121c,121d,122a,122b,122c,122d・・・励振用電極
124a,124b・・・周波数調整用金属膜
214a,214b,214c,214d・・・細溝部
DESCRIPTION OF SYMBOLS 100 ... Tuning fork type bending crystal oscillator 110, 210 ... Crystal piece
111 ... Base 112a ... First vibrating arm 112b ... Second vibrating arm 113a, 213a ... First groove 113b, 213b ... Second groove 113c, 213c ... Third groove 113d, 213d ... Fourth groove 121a, 121b, 121c, 121d, 122a, 122b, 122c, 122d ... Excitation electrodes 124a, 124b ... Frequency adjusting metal films 214a, 214b , 214c, 214d ... narrow groove

Claims (2)

基部と、前記基部の側面より同一の方向に延びる二本の振動腕部とを備え、
前記振動腕部の両主面には溝部が設けられており、
前記振動腕部の一方の主面に設けられた前記溝部と前記振動腕部の他方の主面に設けられた前記溝部とは、前記振動腕部の一方の主面に設けられた前記溝部の内部の底面と前記振動腕部の他方の主面に設けられた前記溝部の内部の底面とが前記振動腕部の内部で対向しないように、前記振動腕部の一方の主面に設けられた前記溝部を基部側に、前記振動腕部の他方の主面に設けられた前記溝部を前記振動腕部の先端側に、前記振動腕部の長さ方向に交互にずらして設けられており、
前記振動腕部の両主面には前記振動腕部の長さ方向に沿った励振用電極が設けられており、
前記振動腕部の先端部の一方の主面には周波数調整用金属膜が設けられた音叉型屈曲水晶振動素子であって、
前記振動腕部の一方の主面に設けられた前記励振用電極の前記振動腕部の先端側の端部は、前記振動腕部の一方の主面に設けられた前記励振用電極の前記振動腕部の先端側の端部よりも、前記基部側に寄って設けられており、
前記振動腕部の一方の主面に設けられた前記周波数調整用金属膜の基部側の端部が、前記振動腕部の他方の主面に設けられた前記励振用電極の各振動腕部の先端側の端部よりも、基部側に延出して設けられていることを特徴とする音叉型屈曲水晶振動素子。
A base, and two vibrating arms extending in the same direction from the side of the base,
Grooves are provided on both main surfaces of the vibrating arm part,
The groove portion provided on one main surface of the vibrating arm portion and the groove portion provided on the other main surface of the vibrating arm portion are the same as the groove portion provided on one main surface of the vibrating arm portion. Provided on one main surface of the vibrating arm portion such that an inner bottom surface and an inner bottom surface of the groove portion provided on the other main surface of the vibrating arm portion do not face each other inside the vibrating arm portion. The groove portion is provided on the base side, and the groove portion provided on the other main surface of the vibrating arm portion is provided on the distal end side of the vibrating arm portion, being alternately shifted in the length direction of the vibrating arm portion,
Excitation electrodes along the length direction of the vibrating arm portion are provided on both main surfaces of the vibrating arm portion,
A tuning fork-type bending quartz crystal vibration element provided with a frequency adjusting metal film on one main surface of the tip of the vibrating arm,
The end of the vibration arm portion on the tip side of the excitation electrode provided on one main surface of the vibration arm portion is the vibration of the excitation electrode provided on one main surface of the vibration arm portion. It is provided closer to the base side than the end part on the tip side of the arm part,
An end portion on the base side of the metal film for frequency adjustment provided on one main surface of the vibration arm portion is provided on each vibration arm portion of the excitation electrode provided on the other main surface of the vibration arm portion. A tuning fork-type bent quartz crystal vibration element characterized by being provided to extend toward the base side rather than the end portion on the tip side.
前記溝部が、前記振動腕部の幅方向に平行に並んだ少なくとも2本以上の細溝部で構成されている特徴とする請求項1に記載の音叉型屈曲水晶振動素子。   2. The tuning fork-type bending crystal resonator element according to claim 1, wherein the groove portion is composed of at least two or more narrow groove portions arranged in parallel with the width direction of the vibrating arm portion.
JP2010103737A 2010-04-28 2010-04-28 Tuning-fork type bent crystal oscillating element Pending JP2011234200A (en)

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CN114189228A (en) * 2021-11-16 2022-03-15 苏州亿波达光电子科技有限公司 Quartz tuning fork resonator and preparation method thereof
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