JP3627585B2 - Method for fixing quartz crystal resonator of electronic timepiece and electronic timepiece having crystal resonator fixing structure - Google Patents

Method for fixing quartz crystal resonator of electronic timepiece and electronic timepiece having crystal resonator fixing structure Download PDF

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JP3627585B2
JP3627585B2 JP25037599A JP25037599A JP3627585B2 JP 3627585 B2 JP3627585 B2 JP 3627585B2 JP 25037599 A JP25037599 A JP 25037599A JP 25037599 A JP25037599 A JP 25037599A JP 3627585 B2 JP3627585 B2 JP 3627585B2
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crystal resonator
circuit board
fixing
electrode
crystal
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JP2001074869A (en
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健一 中島
守 渡辺
重男 鈴木
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Seiko Instruments Inc
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Seiko Instruments Inc
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Description

【０００１】
【発明の属する技術分野】
本発明は、電子時計の水晶振動子の固定方法及び水晶振動子の固定構造を有する電子時計に関する。
【０００２】
【従来の技術】
一般に、電子時計には、非常に正確な振動をする振動体としての水晶振動子を振り子の代わりに利用するため、振動子に電流を流したり(発振回路)、振動数を落としたり(分周回路)、時刻表示手段を駆動するなどの働きをするＩＣが電子回路として用いられており、このＩＣは回路基板上にハンダ付けにより装着され、その周囲にハンダバンプ相当部より金めっき等により回路パターンが形成されている。
【０００３】
そして、前記の回路基板の一端には、前記発振回路に水晶振動子を接続するために、水晶振動子の一端に設けられた電極を固定する電極固定部を備えた水晶振動子接続部が形成され、前記電極固定部に形成された一対の金めっき製の回路パターンの各々の上に、水晶振動子の一対の電極をそれぞれハンダ付けにより固定・接続されている。
【０００４】
従来、前記回路基板の水晶振動子接続部に水晶振動子を固定するに際して、電子時計のムーブメントの厚みをできるだけ薄くするために、以下の固定方法が採用されている。
（Ａ）側面図である図５に示すように、裏面に回路パターンの形成された回路基板１００の水晶振動子接続部１０１の電極固定部としての回路パターンに、図の実線で示す水晶振動子１０２の一対の電極１０３の一部をハンダ１０４によって固定する。その後、水晶振動子１０２が図５の一点鎖線で示す姿勢・位置になるように、電極１０３を折り曲げる。
【０００５】
（Ｂ）正面図である図６に示すように、裏面に回路パターンの形成された回路基板１００を、回路基板本体部１００ｍと水晶振動子接続部１０１との間で下方へ折り曲げておく。そして水晶振動子接続部１０１の電極固定部としての回路パターンに水晶振動子１０２の一対の電極１０３の一部をハンダ１０４によって固定する。
【０００６】
【発明が解決しようとする課題】
前記従来の水晶振動子の固定方法には、下記のような問題点がある。
（１）前記（Ａ）項の方法では、電極１０３が折り曲げ部より水晶振動子１０２の端部に至るストレートな部分の高さ分だけ水晶振動子１０２が出っ張って、ムーブメントの厚みが厚くなり、断面的な薄型化が困難である。又、水晶振動子１０２の電極１０３を回路パターンにハンダ付け後に電極１０３を曲げる工程が必要であり、工程が増えコストアップとなる。さらに、電極１０３を回路パターンにハンダ付け後に電極１０３を曲げる際に、ハンダと回路パターンとの間にはがれが生じることがある。
（２）前記（Ｂ）項の方法では、予め回路基板１００を、回路基板本体部１００ｍと水晶振動子接続部１０１との間で下方へ折り曲げておく工程が必要であり、工程が増えコストアップとなる。又、この折り曲げ加工の際に、曲げ応力が局部的に集中せず、折り曲げ部付近の回路パターンにストレスが作用して、この部分や電極固定部の回路パターンが回路基板１００からはがれやすい。
【０００７】
本発明は、前記従来技術の問題点を解消し、ムーブメントの薄型化が容易であり、又、水晶振動子の電極や回路基板を折り曲げるための余分な工程を必要とせずコストダウンが可能であり、さらに、電極の曲げ加工にともなうハンダの回路パターンからのはがれの発生の防止が可能で、品質の安定化が図れる電子時計の水晶振動子の固定方法及び水晶振動子の固定構造を有する電子時計の提供を第１の課題とする。
【０００８】
本発明は、又、回路基板の曲げ加工に伴う曲げ加工部や電極固定部の回路パターンの回路基板からのはがれの発生の防止が可能で、品質の安定化が図れる電子時計の水晶振動子の固定方法及び水晶振動子の固定構造を有する電子時計の提供を第２の課題とする。
【０００９】
【課題を解決するための手段】
本発明の電子時計の水晶振動子の固定方法は、前記第１の課題を解決するために、第１の手段として、
水晶振動子の一端に設けられた電極を固定する電極固定部を備え、回路基板の一端に形成された水晶振動子接続部と、回路基板本体部との間の折曲予定線の少なくとも一端部に予め切欠きを形成して、前記折曲予定線の位置にくびれを形成しておくとともに、
前記回路基板の水晶振動子接続部の電極固定部に前記水晶振動子の電極を固定し、
地板とこの地板の上に載る輪列受とに予め形成された水晶振動子収納溝部に前記水晶振動子を収納するに際して、
前記輪列受の水晶振動子収納溝部に張り出すように前記輪列受の上に回路押さえ板を装着して、この回路押さえ板の張り出し部の下端縁に前記水晶振動子の上部外周面が当接して、この水晶振動子に下向きの押込み力が作用するようにすることによって、前記折曲予定線で前記回路基板を下向きに折曲させること、
を特徴とするように構成したものである。
【００１０】
前記第１の手段を採用した本発明の電子時計の水晶振動子の固定方法においては、前記第２の課題を解決するために、第２の手段として、前記回路基板の折曲予定線と交叉する回路パターンを当該交叉部において湾曲するように形成しておくことを特徴とすることが好ましい。
【００１１】
本発明の水晶振動子の固定構造を有する電子時計は、前記第1の課題を解決するために、第１の手段として水晶振動子の一端に設けられた電極と、この電極を固定する電極固定部を備え回路基板の一端に形成された水晶振動子接続部と、地板とこの地板の上に載る輪列受とに予め形成された水晶振動子収納溝部と、を備える水晶振動子の固定構造を有する電子時計を、前記回路基板の水晶振動子接続部と回路基板本体部との間の折曲予定線の少なくとも一端部に予め形成された切欠きと、前記水晶振動子収納溝部に張り出すように前記輪列受の上に搭載される回路押さえ板の張り出し部と、を備えてなり、
前記回路基板の水晶振動子接続部の前記電極固定部に前記水晶振動子の電極を固定した後、前記地板とこの地板の上に載る輪列受とに予め形成された水晶振動子収納溝部に前記水晶振動子の本体部を収納するに際して、 前記回路押さえ板の張り出し部の下端縁に前記水晶振動子の上部外周面が当接して、この水晶振動子に下向きの押込み力が作用するようにすることによって、前記折曲予定線で前記回路基板が下向きに折曲するように形成したこと、を特徴とするように構成したものである。
【００１２】
前記第１の手段を採用した本発明の水晶振動子の固定構造を有する電子時計においては、前記第２の課題を解決するために、第２の手段として、前記折曲予定線と交叉する回路パターンの当該交叉部に形成された回路パターン湾曲部回路基板の一端に形成された水晶振動子接続部と、回路基板本体部との間の折曲予定線の少なくとも一端部に予め切欠きを形成して、前記折曲予定線の位置にくびれを形成しておくため、水晶振動子の電極を回路基板の水晶をさらに備えることを特徴とすることが望ましい。
【００１３】
（作用）
前記第１の手段を採用した本発明の電子時計の水晶振動子の固定方法及び水晶振動子の固定構造を有する電子時計のような構成は、以下のような作用・効果を奏する。
（１）振動子接続部の電極固定部としての回路パターンの上にハンダ付けで固定した後に、前記地板とこの地板の上に載る輪列受とに予め形成された水晶振動子収納溝部に前記水晶振動子の本体部を収納するに際して、前記回路押さえ板の張り出し部の下端縁に前記水晶振動子の上部外周面が当接して、この水晶振動子に下向きの押込み力が作用するようにすることによって、前記折曲予定線で前記回路基板が下向きに折曲する。その結果、回路基板の折曲時に回路基板に作用するストレスが分散せず、折曲線の部分に局部的に発生するため、電極固定部の回路パターンから電極固定用のハンダがはがれることがない。また、予め回路基板を折曲させておいたり、あるい電極のはハンダ付け・固定後に電極を折曲させる等の余分な工程を必要とせず、コストダウンが可能である。さらに、電極を回路パターンにハンダ付け後に電極を曲げる必要がなく、ハンダと回路パターンとの間にはがれが生じることがない。
（２）電極を折曲させる必要がないので、その分ムーブメントの薄型化が図れる。
【００１４】
前記第２の手段を採用した本発明の電子時計の水晶振動子の固定方法及び水晶振動子の固定構造を有する電子時計のような構成は、以下のような作用・効果を奏する。
即ち、前記回路基板の折曲予定線と交叉する回路パターンを当該交叉部において湾曲するように形成しておくことにより、回路基板の折曲時に回路基板及び回路パターンに作用するストレスが分散せず、折曲線近傍において回路基板から回路パターンがはがれたり、電極固定部においてハンダが回路パターンからはがれることがない。
【００１５】
【発明の実施の形態】
本発明の実施の形態を添付の図面を参照しつつ以下に説明する。
図１は本発明の水晶振動子の固定構造を有する電子時計の一実施の形態における回路基板の平面図、図２は本発明の水晶振動子の固定構造を有する電子時計の一実施の形態における一部の構成・部品配置を示す平面図、図３は図２のＡ−Ａ線矢視断面図、図4は図２のＢ−Ｂ線矢視断面図である。
【００１６】
本発明の水晶振動子の固定構造を有する電子時計の実施の形態は、図に示すように、水晶振動子１の一端に設けられた電極２と、この電極２を固定する電極固定部４ａを備え回路基板３の一端に形成された水晶振動子接続部４と、地板６とこの地板６の上に載る輪列受７とに予め形成された水晶振動子収納溝部８と、を備える水晶振動子の固定構造を有する電子時計であって、
前記回路基板３の水晶振動子接続部４と回路基板本体部５との間の折曲予定線９の一端部に予め形成された切欠き１０と、前記水晶振動子収納溝部８に張り出すように前記輪列受７の上に搭載される回路押さえ板１３の張り出し部１４と、を備えてなり、
前記回路基板３の水晶振動子接続部４の電極固定部４ａに前記水晶振動子１の電極２を固定した後、前記水晶振動子収納溝部８に前記水晶振動子１を収納するに際して、
前記回路押さえ板１３の張り出し部１４の下端縁１４ｂｅに前記水晶振動子３の上部外周面１ｕｓが当接して、この水晶振動子３に下向きの押込み力が作用するようにすることによって、前記折曲予定線９で前記回路基板３が下向きに折曲するように形成したこと、を特徴とするように主要部が構成される。
【００１７】
前記の実施の形態においては、又、前記折曲予定線９と交叉する回路パターン１１の当該交叉部に形成された回路パターン湾曲部１２をさらに備えるように主要部が構成される。
【００１８】
次に、本発明の電子時計の水晶振動子の固定方法の一実施の形態を、前記の図面を参照しつつ、以下に手順を追って説明する。
（１）水晶振動子１の一端に設けられた電極２を固定する電極固定部４ａを備え、回路基板３の一端に形成された水晶振動子接続部４と、回路基板本体部５との間の折曲予定線９の一端部に予め切欠き１０を形成して、前記折曲予定線の位置にくびれを形成しておく。
（２）前記回路基板３の折曲予定線９と交叉する回路パターン１１を当該交叉部において湾曲させて湾曲部１２を形成しておく。
（３）前記回路基板３の水晶振動子接続部４の電極固定部４ａとしての回路パターンに前記水晶振動子１の電極２をハンダ１５により固定する。
（４）地板６とこの地板６の上に載る輪列受７とに予め形成された水晶振動子収納溝部８に前記水晶振動子１を収納するに際して、前記輪列受７の水晶振動子収納溝部８に張り出すように前記輪列受７の上に回路押さえ板１３を装着して、この回路押さえ板１３の張り出し部１４の下端縁１４ｂｅに前記水晶振動子１の上部外周面１ｕｓが当接して、この水晶振動子１に下向きの押込み力が作用するようにすることによって、前記折曲予定線９で前記回路基板３を下向きに折曲させる。
【００１９】
前記のように、構成した本発明の電子時計の水晶振動子の固定方法及び水晶振動子の固定構造を有する電子時計は、以下のような作用・効果を奏する。
（１）回路基板３の一端に形成された水晶振動子接続部４と、回路基板本体部５との間の折曲予定線９の一端部に予め切欠き１０を形成して、前記折曲予定線９の位置にくびれを形成しておくため、水晶振動子１の電極２を回路基板３の水晶振動子接続部４の電極固定部４ａとしての回路パターンの上にハンダ１５で固定した後に、前記地板６とこの地板６の上に載る輪列受７とに予め形成された水晶振動子収納溝部８に前記水晶振動子１を収納するに際して、前記回路押さえ板１３の張り出し部１４の下端縁１４ｂｅに前記水晶振動子１の上部外周面１ｕｓが当接して、この水晶振動子１に下向きの押込み力が作用するようにすることによって、前記折曲予定線９で前記回路基板３が下向きに折曲する。その結果、回路基板３の折曲時に回路基板３に作用するストレスが分散せず、折曲線９の部分に局部的に発生するため、電極固定部１４ａの回路パターンから電極固定用のハンダ１５がはがれることがない。また、予め回路基板３を折曲させておいたり、あるい電極２のはハンダ付け・固定後に電極２を折曲させる等の余分な工程を必要とせず、コストダウンが可能である。さらに、電極２を電極固定部１４としての回路パターンにハンダ１５により固定した後に電極２を曲げる必要がなく、ハンダ１５と回路パターンとの間にはがれが生じることがない。
（２）電極２を折曲させる必要がないので、その分ムーブメントの薄型化が図れる。
【００２０】
（３）前記回路基板３の折曲予定線９と交叉する回路パターン１１を当該交叉部において湾曲させて湾曲部１２を形成しておくことにより、回路基板３の折曲時に回路基板３及び回路パターン１１に作用するストレスが分散せず、折曲線９の近傍において回路基板３から回路パターン１１がはがれたり、電極固定部においてハンダが回路パターンからはがれることがない。
【００２１】
【発明の効果】
本発明は、以下のような優れた効果を奏する。
（１）本発明によれば、回路基板の折曲時に回路基板に作用するストレスが分散せず、折曲線の部分に局部的に発生するため、電極固定部の回路パターンから電極固定用のハンダがはがれることがない。また、予め回路基板を折曲させておいたり、予め電極を曲げておいたり、あるい電極のはハンダ付け・固定後に電極を折曲させる等の余分な工程を必要とせず、コストダウンが可能である。さらに、電極を回路パターンにハンダ付け後に再度電極を曲げる必要がなく、ハンダと回路パターンとの間にはがれが生じることがない。さらに又、電極を予め折曲させる必要がないので、ムーブメントの薄型化が図れる。
【００２２】
（２）本発明によれば、回路基板の折曲時に回路基板及び回路パターンに作用するストレスが分散せず、折曲線近傍において回路基板から回路パターンがはがれたり、電極固定部においてハンダが回路パターンからはがれることがない。
【図面の簡単な説明】
【図１】本発明の水晶振動子の固定構造を有する電子時計の一実施の形態における回路基板の平面図である。
【図２】本発明の水晶振動子の固定構造を有する電子時計の一実施の形態における一部の構成・部品配置を示す平面図である。
【図３】図２のＡ−Ａ線矢視断面図である。
【図４】図２のＢ−Ｂ線矢視断面図である。
【図５】従来の電子時計の水晶振動子の固定方法の一例を示す側面図である。
【図６】従来の電子時計の水晶振動子の固定方法の別の一例を示す正面図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for fixing a quartz resonator of an electronic timepiece and an electronic timepiece having a quartz crystal fixing structure.
[0002]
[Prior art]
Generally, in an electronic timepiece, a quartz vibrator as a vibrating body that vibrates very accurately is used instead of a pendulum, so that a current is passed through the vibrator (oscillation circuit) or the frequency is reduced (frequency division). IC) that functions to drive the time display means, etc. is used as an electronic circuit. This IC is mounted on a circuit board by soldering, and a circuit pattern is formed around the solder bump by gold plating or the like. Is formed.
[0003]
In addition, a crystal resonator connecting portion having an electrode fixing portion for fixing an electrode provided at one end of the crystal resonator is formed at one end of the circuit board in order to connect the crystal resonator to the oscillation circuit. The pair of electrodes of the crystal resonator is fixed and connected to each of the pair of gold-plated circuit patterns formed on the electrode fixing portion by soldering.
[0004]
Conventionally, when fixing a crystal resonator to the crystal resonator connecting portion of the circuit board, the following fixing method has been adopted in order to make the movement of the electronic timepiece as thin as possible.
(A) As shown in FIG. 5 which is a side view, a crystal resonator indicated by a solid line in the circuit pattern as an electrode fixing portion of the crystal resonator connecting portion 101 of the circuit board 100 having a circuit pattern formed on the back surface A part of the pair of electrodes 103 of 102 is fixed by solder 104. Thereafter, the electrode 103 is bent so that the crystal unit 102 is in the posture and position indicated by the one-dot chain line in FIG.
[0005]
(B) As shown in FIG. 6 which is a front view, the circuit board 100 having the circuit pattern formed on the back surface is bent downward between the circuit board main body portion 100m and the crystal resonator connecting portion 101. A part of the pair of electrodes 103 of the crystal unit 102 is fixed to the circuit pattern as the electrode fixing unit of the crystal unit connection unit 101 by the solder 104.
[0006]
[Problems to be solved by the invention]
The conventional method for fixing a crystal resonator has the following problems.
(1) In the method of the above item (A), the crystal unit 102 protrudes by the height of the straight portion from which the electrode 103 is bent to the end of the crystal unit 102, and the thickness of the movement is increased. It is difficult to reduce the cross section. Further, a process of bending the electrode 103 after soldering the electrode 103 of the crystal unit 102 to the circuit pattern is necessary, which increases the number of processes and increases the cost. Further, when the electrode 103 is bent after the electrode 103 is soldered to the circuit pattern, a peeling may occur between the solder and the circuit pattern.
(2) In the method of (B), a step of bending the circuit board 100 in advance downward between the circuit board main body portion 100m and the crystal resonator connecting portion 101 is necessary, which increases the number of steps and increases the cost. It becomes. Further, during this bending process, the bending stress is not concentrated locally, the stress acts on the circuit pattern near the bent portion, and the circuit pattern of this portion and the electrode fixing portion is easily peeled off from the circuit board 100.
[0007]
The present invention eliminates the problems of the prior art, makes it easy to reduce the thickness of the movement, and can reduce the cost without requiring an extra step for bending the crystal resonator electrode or circuit board. Furthermore, the method of fixing the quartz resonator of the electronic watch capable of preventing the peeling from the solder circuit pattern accompanying the bending of the electrode and stabilizing the quality, and the electronic watch having the structure of fixing the quartz resonator Is the first issue.
[0008]
The present invention is also capable of preventing the occurrence of peeling of the circuit pattern of the bent portion or the electrode fixing portion from the circuit board accompanying the bending of the circuit board, and of the quartz resonator of the electronic timepiece capable of stabilizing the quality. A second problem is to provide an electronic timepiece having a fixing method and a crystal resonator fixing structure.
[0009]
[Means for Solving the Problems]
In order to solve the first problem, the method of fixing the quartz resonator of the electronic timepiece according to the present invention includes, as a first means,
At least one end portion of the planned bending line between the crystal resonator connecting portion formed at one end of the circuit board and the circuit board main body portion, having an electrode fixing portion for fixing the electrode provided at one end of the crystal resonator And forming a notch in advance, forming a constriction at the position of the planned bending line,
Fixing the electrode of the crystal resonator to the electrode fixing portion of the crystal resonator connecting portion of the circuit board;
When storing the crystal unit in the crystal unit storing groove formed in advance on the base plate and the train wheel bridge mounted on the base plate,
A circuit holding plate is mounted on the train wheel bridge so as to project into the crystal housing housing groove of the train wheel bridge, and the upper outer peripheral surface of the crystal oscillator is at the lower end edge of the projecting portion of the circuit holding plate. The circuit board is bent downward along the planned bending line by causing a downward pressing force to act on the quartz crystal unit,
It is comprised so that it may be characterized by.
[0010]
In the fixing method of the quartz crystal resonator of the electronic timepiece of the present invention adopting the first means, in order to solve the second problem, as a second means, a crossing with a planned bending line of the circuit board is performed. It is preferable that the circuit pattern to be formed is formed to be curved at the intersection.
[0011]
In order to solve the first problem, an electronic timepiece having a crystal resonator fixing structure according to the present invention has, as a first means, an electrode provided at one end of the crystal resonator and an electrode fixing for fixing the electrode. A crystal resonator fixing structure comprising: a crystal resonator connecting portion formed on one end of a circuit board, and a crystal resonator housing groove portion formed in advance on a ground plate and a train wheel bridge mounted on the ground plate An electronic timepiece having a notch formed in advance at least at one end of a bending line between the quartz crystal resonator connecting portion and the circuit board main body portion of the circuit board, and projecting into the quartz crystal resonator housing groove portion. And a protruding portion of a circuit holding plate mounted on the train wheel bridge,
After fixing the electrode of the crystal resonator to the electrode fixing portion of the crystal resonator connecting portion of the circuit board, the crystal resonator housing groove portion formed in advance on the base plate and the train wheel bridge mounted on the base plate is provided. When housing the main body of the crystal resonator, the upper outer peripheral surface of the crystal resonator is in contact with the lower end edge of the protruding portion of the circuit pressing plate so that a downward pressing force acts on the crystal resonator. By doing so, the circuit board is formed to be bent downward along the planned bending line.
[0012]
In the electronic timepiece having the quartz crystal fixing structure of the present invention employing the first means, in order to solve the second problem, as a second means, a circuit crossing the planned bending line. A notch is formed in advance at least at one end portion of a bending line between the crystal resonator connecting portion formed at one end of the circuit board and the circuit board main body portion at the circuit pattern bending portion formed at the crossing portion of the pattern. In order to form a constriction at the position of the planned bending line, it is desirable that the crystal resonator electrode further includes a crystal of the circuit board.
[0013]
(Function)
The structure of the electronic timepiece having the crystal resonator fixing method and the crystal resonator fixing structure of the electronic timepiece of the present invention adopting the first means has the following operations and effects.
(1) After fixing by soldering on a circuit pattern as an electrode fixing portion of the vibrator connection portion, the crystal vibrator housing groove portion formed in advance on the ground plate and a train wheel bridge mounted on the ground plate When housing the main body of the crystal unit, the upper outer peripheral surface of the crystal unit is brought into contact with the lower end edge of the protruding portion of the circuit pressing plate so that a downward pressing force acts on the crystal unit. As a result, the circuit board bends downward along the planned folding line. As a result, stress acting on the circuit board when the circuit board is bent is not dispersed and locally occurs in the bent portion, so that the electrode fixing solder is not peeled off from the circuit pattern of the electrode fixing portion. Further, there is no need for an extra step such as bending the circuit board in advance or bending the electrode after soldering / fixing, and the cost can be reduced. Furthermore, there is no need to bend the electrode after soldering the electrode to the circuit pattern, and no peeling occurs between the solder and the circuit pattern.
(2) Since there is no need to bend the electrodes, the movement can be made thinner accordingly.
[0014]
The structure of the electronic timepiece having the crystal resonator fixing method and the crystal resonator fixing structure of the electronic timepiece of the present invention employing the second means has the following operations and effects.
That is, by forming a circuit pattern that intersects with the planned bending line of the circuit board so as to bend at the intersection, the stress acting on the circuit board and the circuit pattern is not dispersed when the circuit board is bent. The circuit pattern does not peel off from the circuit board in the vicinity of the folding line, and the solder does not peel off from the circuit pattern at the electrode fixing portion.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a plan view of a circuit board in an embodiment of an electronic timepiece having a quartz crystal fixing structure of the present invention, and FIG. 2 is an embodiment of an electronic timepiece having a quartz crystal fixing structure of the present invention. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along line BB in FIG.
[0016]
As shown in the figure, an embodiment of an electronic timepiece having a crystal resonator fixing structure according to the present invention includes an electrode 2 provided at one end of a crystal resonator 1 and an electrode fixing portion 4a for fixing the electrode 2. A crystal vibration comprising a crystal resonator connecting portion 4 formed at one end of the provided circuit board 3, and a crystal resonator housing groove portion 8 formed in advance on a base plate 6 and a train wheel bridge 7 mounted on the base plate 6. An electronic timepiece having a child fixing structure,
A notch 10 formed in advance at one end of a bending line 9 between the crystal resonator connecting portion 4 and the circuit substrate main body portion 5 of the circuit board 3 and the crystal resonator housing groove portion 8 are projected. And an overhanging portion 14 of a circuit pressing plate 13 mounted on the train wheel bridge 7,
After the electrode 2 of the crystal resonator 1 is fixed to the electrode fixing portion 4a of the crystal resonator connecting portion 4 of the circuit board 3, the crystal resonator 1 is stored in the crystal resonator storing groove portion 8.
The upper outer peripheral surface 1 us of the crystal resonator 3 is brought into contact with the lower end edge 14be of the projecting portion 14 of the circuit pressing plate 13 so that a downward pressing force acts on the crystal resonator 3 to thereby cause the folding. The main part is configured to be characterized in that the circuit board 3 is formed to be bent downward along the planned curve line 9.
[0017]
In the above-described embodiment, the main portion is configured to further include a circuit pattern bending portion 12 formed at the crossing portion of the circuit pattern 11 crossing the planned bending line 9.
[0018]
Next, an embodiment of a method for fixing a quartz resonator of an electronic timepiece according to the present invention will be described in the following procedure with reference to the drawings.
(1) An electrode fixing portion 4 a for fixing the electrode 2 provided at one end of the crystal resonator 1 is provided. Between the crystal resonator connecting portion 4 formed at one end of the circuit board 3 and the circuit board main body portion 5. A notch 10 is formed in advance at one end of the planned bending line 9 to form a constriction at the position of the planned bending line.
(2) A curved portion 12 is formed by curving a circuit pattern 11 that intersects the planned bending line 9 of the circuit board 3 at the intersection.
(3) The electrode 2 of the crystal unit 1 is fixed to the circuit pattern as the electrode fixing unit 4 a of the crystal unit connection unit 4 of the circuit board 3 by the solder 15.
(4) When the crystal unit 1 is stored in the crystal unit storage groove 8 formed in advance on the base plate 6 and the train wheel bridge 7 placed on the base plate 6, the crystal unit housing of the train wheel carrier 7 is stored. A circuit pressing plate 13 is mounted on the train wheel bridge 7 so as to protrude into the groove portion 8, and the upper outer peripheral surface 1 us of the crystal resonator 1 is brought into contact with the lower end edge 14be of the protruding portion 14 of the circuit pressing plate 13. In contact therewith, a downward pushing force is applied to the quartz crystal resonator 1, whereby the circuit board 3 is bent downward along the planned bending line 9.
[0019]
As described above, the electronic timepiece having the quartz crystal fixing method and the quartz crystal fixing structure of the electronic timepiece according to the present invention configured as described above has the following operations and effects.
(1) A notch 10 is formed in advance at one end portion of a planned bending line 9 between the crystal resonator connecting portion 4 formed at one end of the circuit board 3 and the circuit board main body portion 5, and the bending is performed. In order to form a constriction at the position of the planned line 9, after fixing the electrode 2 of the crystal resonator 1 on the circuit pattern as the electrode fixing portion 4 a of the crystal resonator connecting portion 4 of the circuit board 3 with the solder 15. When the crystal unit 1 is stored in the crystal unit storing groove 8 formed in advance on the base plate 6 and the train wheel bridge 7 mounted on the base plate 6, the lower end of the protruding portion 14 of the circuit pressing plate 13 is stored. The upper outer peripheral surface 1 us of the crystal unit 1 is brought into contact with the edge 14 be so that a downward pushing force acts on the crystal unit 1, so that the circuit board 3 is directed downward along the planned bending line 9. Bend to. As a result, the stress acting on the circuit board 3 is not dispersed when the circuit board 3 is bent, and is locally generated in the portion of the folding line 9, so that the electrode fixing solder 15 is generated from the circuit pattern of the electrode fixing portion 14a. There is no peeling. Further, there is no need for an extra step such as bending the circuit board 3 in advance, or bending the electrode 2 after soldering / fixing the electrode 2, and the cost can be reduced. Furthermore, there is no need to bend the electrode 2 after the electrode 2 is fixed to the circuit pattern as the electrode fixing portion 14 by the solder 15, and no peeling occurs between the solder 15 and the circuit pattern.
(2) Since there is no need to bend the electrode 2, the movement can be made thinner accordingly.
[0020]
(3) By bending the circuit pattern 11 intersecting with the planned bending line 9 of the circuit board 3 at the crossing portion to form the curved portion 12, the circuit board 3 and the circuit when the circuit board 3 is bent. The stress acting on the pattern 11 is not dispersed, and the circuit pattern 11 is not peeled off from the circuit board 3 in the vicinity of the folding line 9, and the solder is not peeled off from the circuit pattern at the electrode fixing portion.
[0021]
【The invention's effect】
The present invention has the following excellent effects.
(1) According to the present invention, the stress acting on the circuit board is not dispersed when the circuit board is bent, and the stress is locally generated in the bent portion. Therefore, the electrode fixing solder is formed from the circuit pattern of the electrode fixing section. Will not come off. In addition, the cost can be reduced without the need for extra steps such as bending the circuit board in advance, bending the electrode in advance, or bending the electrode after soldering and fixing. It is. Furthermore, there is no need to bend the electrode again after soldering the electrode to the circuit pattern, and no peeling occurs between the solder and the circuit pattern. Furthermore, since it is not necessary to bend the electrodes in advance, the movement can be made thinner.
[0022]
(2) According to the present invention, when the circuit board is bent, the stress acting on the circuit board and the circuit pattern is not dispersed, the circuit pattern is peeled off from the circuit board in the vicinity of the bending curve, and the solder is formed on the electrode fixing portion. It will not come off.
[Brief description of the drawings]
FIG. 1 is a plan view of a circuit board in an embodiment of an electronic timepiece having a quartz crystal fixing structure of the present invention.
FIG. 2 is a plan view showing a part of the configuration / component arrangement in an embodiment of an electronic timepiece having a quartz crystal resonator fixing structure according to the present invention.
3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along line BB in FIG.
FIG. 5 is a side view showing an example of a method of fixing a quartz resonator of a conventional electronic timepiece.
FIG. 6 is a front view showing another example of a method of fixing a quartz resonator of a conventional electronic timepiece.

Claims (2)

水晶振動子の一端に設けられた電極を固定する電極固定部を備え、回路基板の一端に形成された水晶振動子接続部と、回路基板本体部との間の折曲予定線の少なくとも一端部に予め切欠きを形成して、前記折曲予定線の位置にくびれを形成しておくとともに、
前記回路基板の水晶振動子接続部の前記電極固定部に前記水晶振動子の電極をハンダ付けにより固定し、
地板とこの地板の上に載る輪列受とに予め形成された水晶振動子収納溝部に前記水晶振動子を収納するに際して、
前記輪列受の水晶振動子収納溝部に張り出すように前記輪列受の上に回路押さえ板を装着して、この回路押さえ板の張り出し部の下端縁に前記水晶振動子の上部外周面が当接して、この水晶振動子に下向きの押込み力が作用するようにすることによって、前記折曲予定線で前記回路基板を下向きに折曲させ、
前記回路基板の折曲予定線と交叉する回路パターンを当該交叉部において湾曲するように形成しておくことを特徴とする電子時計の水晶振動子の固定方法。At least one end portion of the planned bending line between the crystal resonator connecting portion formed at one end of the circuit board and the circuit board main body portion, having an electrode fixing portion for fixing the electrode provided at one end of the crystal resonator And forming a notch in advance, forming a constriction at the position of the planned bending line,
Fixing the electrode of the crystal resonator to the electrode fixing portion of the crystal resonator connecting portion of the circuit board by soldering,
When storing the crystal unit in the crystal unit storing groove formed in advance on the base plate and the train wheel bridge mounted on the base plate,
A circuit holding plate is mounted on the train wheel bridge so as to project into the crystal housing housing groove of the train wheel bridge, and the upper outer peripheral surface of the crystal oscillator is at the lower end edge of the projecting portion of the circuit holding plate. By abutting and causing a downward pushing force to act on this crystal resonator, the circuit board is bent downward at the planned bending line ,
A method of fixing a quartz crystal resonator of an electronic timepiece, wherein a circuit pattern intersecting with a predetermined bending line of the circuit board is formed to bend at the intersection . 水晶振動子の一端に設けられた電極と、この電極を固定する電極固定部を備え回路基板の一端に形成された水晶振動子接続部と、地板とこの地板の上に載る輪列受とに予め形成された水晶振動子収納溝部と、を備える水晶振動子の固定構造を有する電子時計であって、
前記回路基板の水晶振動子接続部と回路基板本体部との間の折曲予定線の少なくとも一端部に予め形成された切欠きと、
前記水晶振動子収納溝部に張り出すように前記輪列受の上に搭載される回路押さえ板の張り出し部と、
を備えてなり、
前記回路基板の水晶振動子接続部の電極固定部に前記水晶振動子の電極をハンダ付けにより固定した後、前記水晶振動子収納溝部に前記水晶振動子の本体部を収納するに際して、
前記回路押さえ板の張り出し部の下端縁に前記水晶振動子の上部外周面が当接して、この水晶振動子に下向きの押込み力が作用するようにすることによって、前記折曲予定線で前記回路基板が下向きに折曲するように形成し、
前記折曲予定線と交叉する回路パターンの当該交叉部に形成された回路パターン湾曲部をさらに備えることを特徴とした水晶振動子の固定構造を有する電子時計。An electrode provided at one end of the crystal resonator, a crystal resonator connecting portion formed at one end of the circuit board having an electrode fixing portion for fixing the electrode, and a base plate and a train wheel bridge mounted on the ground plate An electronic timepiece having a quartz crystal fixing structure including a quartz crystal storage groove formed in advance,
A notch formed in advance in at least one end portion of the planned bending line between the crystal resonator connecting portion of the circuit board and the circuit board body portion;
An overhang portion of a circuit pressing plate mounted on the train wheel bridge so as to overhang the crystal resonator housing groove portion;
With
After the crystal resonator electrode is fixed to the electrode fixing portion of the crystal resonator connection portion of the circuit board by soldering, the crystal resonator housing groove portion is housed with the crystal resonator main body.
An upper outer peripheral surface of the crystal resonator is in contact with a lower end edge of the projecting portion of the circuit pressing plate so that a downward pressing force acts on the crystal resonator, thereby causing the circuit to be bent along the expected bending line. It is formed so that the substrate bends downward ,
An electronic timepiece having a quartz crystal fixing structure, further comprising a circuit pattern bending portion formed at a crossing portion of the circuit pattern crossing the planned bending line .
JP25037599A 1999-09-03 1999-09-03 Method for fixing quartz crystal resonator of electronic timepiece and electronic timepiece having crystal resonator fixing structure Expired - Lifetime JP3627585B2 (en)

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