JP2004226132A - Radio controlled timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio controlled timepiece capable of performing accurate time display in a short time at the initial time (for example, when a battery is inserted after being purchased by a user). <P>SOLUTION: This timepiece is provided with a power source part 200 for detecting input of an external battery 201, an internal clock 1401 for holding a clocked time by an internal battery 202, a second hand driving system 120 and an hour-minute hand driving system 130 for driving a second hand wheel, a minute hand wheel and an hour hand wheel having a plurality of reference positions and including a translucent part and a light shielding part, an optical sensor part 140 for detecting a detection signal corresponding to a reference position and a hand position of a hand wheel based on the translucent part and the light shielding part of the hand wheel, and a control circuit 140. The control circuit 140 drives the second hand driving system 120 and the hour-minute hand when detecting input of the external battery 201 by the power source part 200, and after phase adjustment corresponding to the detection signal of the optical sensor part 140 and after second hand origin retrieval and an hour-minute hand origin retrieval, sets the hand position of a hand wheel based on the clocked time by an internal clock 1401 and performs time display by the hand, and before input of the external battery 201 sets the hand position of the hand wheel between the plurality of refernce positions. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００４６】
制御回路１４は、例えば数式（２）に示すように合計数Ｘと合計数Ｚに基いて評価値Ａを算出する。
【００４７】
【数２】

【００４８】
制御回路１４は、図６（ａ）に示すようにロウレベルを０、ハイレベルを１とした場合に、８秒間の同一タイミング毎に合計して、合計数ｂ０〜ｂ３１を生成し、タイミング毎のレベルの変化を評価する。合計数ｂ０〜ｂ３１を単に合計数ｂとも言う。
【００４９】
制御回路１４は、例えば図６（ａ）に示すような場合に、合計数ｂ０〜ｂ３１それぞれは、５，６，８，８，８，８，８，８，０，０，０，０，０，０，１，１，１，１，１，１，１，１，１，４，５，５，５，５，５，５，５，５とする。
【００５０】
制御回路１４は、合計数ｂに基づいて、ロウレベル“Ｌ（０）“の安定度ＳＬを生成する。
制御回路１４は、例えば図６（ｃ）に示すように、合計数ｂ１〜ｂ３１のうち０が５個以上連続している場合には安定度ＳＬを０と設定する。上記以外の場合であって１以下が５個以上連続する場合には安定度ＳＬを１と設定する。上記以外の場合であって２以下が５個以上連続する場合には安定度ＳＬを２と設定する。上記のいずれの条件にも相当しない場合には安定度ＳＬを７と設定する。
【００５１】
制御回路１４は、例えば図６（ｃ）に示すように、合計数ｂに基づいて、ハイレベル“Ｈ（１）“の安定度ＳＨを生成する。詳細には、制御回路１４は、例えば図６（ｃ）に示すように、合計数ｂ１〜ｂ３１のうち８が５個以上連続している場合には安定度ＳＨを０と設定する。上記以外の場合であって６以下が５個以上連続する場合には安定度ＳＨを１と設定する。上記以外の場合であって４以下が５個以上連続する場合には安定度ＳＨを２と設定する。上記のいずれの条件にも相当しない場合には安定度ＳＨを７と設定する。
【００５２】
制御回路１４は、これら安定度ＳＬおよび安定度ＳＨに基いて評価値Ｂを生成する。例えば制御回路１４は、数式（３）に示すように安定度ＳＬと安定度ＳＨを加算して評価値Ｂを生成する。
【００５３】
【数３】
評価値Ｂ＝安定度ＳＬ＋安定度ＳＨ…（３）
【００５４】
評価値Ｂは、受信信号の安定度を示す指標であり、小さいほど安定している状態を示す。
制御回路１４は、図６（ａ）に示したような場合には、安定度ＳＬが０、安定度ＳＨが０であるから、評価値Ｂは０である。
【００５５】
制御回路１４は、評価値Ａおよび評価値Ｂに基いて、受信信号の受信状態を示す評価値Ｃを生成する。例えば、制御回路１４は、数式（４）に示すように、評価値Ａおよび評価値Ｂを加算して評価値Ｃを生成する。評価値Ｃは小さいほど受信状態が良好であることを示す。
【００５６】
【数４】
評価値Ｃ＝評価値Ａ＋評価値Ｂ…（４）
【００５７】
図６（ａ）に示すような場合には、制御回路１４は、評価値Ａが０、評価値Ｂが０であるから、評価値Ｃは０であり、受信状態が極めて良好であると判別する。
【００５８】
制御回路１４は、例えば評価値Ｃが所定の値、例えば２よりも小さい場合には、極めて良好な受信状態であると判別し、評価したその受信周波数で受信するように長波受信回路１１０の受信周波数を設定する。
【００５９】
制御回路１４は、評価値Ｃが所定の値より大きい場合には、異なる周波数の標準電波をサンプリングして受信状態を評価し、異なる周波数の標準電波の受信状態を示す評価値Ｃと比較し、小さい方の評価値Ｃの周波数の標準電波を受信するような制御信号ＣＴＬ１１３を出力して標準電波信号受信系１１の受信周波数を設定する。
制御回路１４は、その設定された受信周波数で受信された標準電波時刻信号に基いて、時刻化が可能である場合には、発振回路１３による基本クロックに基づいて内部時計１４０１の各種カウンタのカウント制御を行う。
【００６０】
制御回路１４は、受信状態が基準範囲にない場合には、制御信号ＣＴＬ１を出力せずに、ドライブ信号ＤＲ１をドライブ回路１５に出力して、報知手段としての発光素子１６を発光させてユーザに標準電波信号がほとんど受信できない旨を報知させる。
【００６１】
制御回路１４は、受信された標準時刻情報に基づいて、内部時計１４０１の各種時刻カウンタで計時されている時刻情報と標準時刻情報とを比較し、誤差が生じている場合には、その誤差に応じて時刻カウンタを修正し、その修正に応じてモータ１３１に制御信号ＣＴＬ２として、修正のためのパルス信号Ｐを入力して早送り駆動等を行い、指針による時刻表示の修正を行う。
【００６２】
次に、電波修正時計のムーブメントおよび指針位置検出系の具体的な構成について、図２，３、図７〜図１５に関連付けて説明する。
時計本体１００は、図２，３に示すように、互いに対向して接続されて輪郭を形成する下ケース１１１、上ケース１１２、ならびに、下ケース１１１および上ケース１１２で形成される空間内において下ケース１１１と連結した状態で配置される中板１１３を有する。
【００６３】
時計本体１００は、互いに対向して接続されて輪郭を形成する第２ケースとしての下ケース１１１および第１ケースとしての上ケース１１２と、この下ケース１１１および上ケース１１２で形成される空間内のほぼ中央部において下ケース１１１と連結した状態で配置される中板１１３とを備えており、空間内の下ケース１１１、中板１１３、上ケース１１２の所定の位置に対して、第１駆動系（秒針駆動系）１２０、第２駆動系（時分針駆動系）１３０、光検出センサ１４０、手動修正系１５０等が固定あるいは軸支されている。
【００６４】
第１駆動系１２０は、図２に示すように、略コ字状のステータ１２１ａ、このステータ１２１ａの一方側の脚片に巻回された駆動コイル１２１ｂ、このステータ１２１ａの他方の磁極間において回動自在に配置されたロータ１２１ｃにより構成された秒針用ステッピングモータ１２１と、ロータ１２１ｃのピニオン１２１ｄに大径歯車１２２ａが噛合した第１伝達歯車（第１検出用歯車）としての第１の５番車１２２と、この第１の５番車１２２の小型歯車１２２ｂに噛合した第２検出用歯車（第１指針車）としての秒針車１２３とにより構成されている。
ここで、秒針用ステッピングモータ１２１は、ステータ１２１ａが中板１１３に載置して固定され、ロータ１２１ｃが中板１１３と上ケース１１２とに軸支されており、制御回路１４の出力制御信号ＣＴＬ１に基づいて、その回転方向、回転角度、および回転速度が制御される。
【００６５】
第１の５番車１２２は、大径歯車１２２ａの歯数が６０個、小径歯車１２２ｂの歯数が１５個に形成され、中板１１３および上ケース１１２に回動自在に軸支され、その大径歯車１２２ａが秒針用ステッピングモータ１２１のロータ１２１ｃ（ピニオン１２１ｄ）と噛合して、ロータ１２１ｃの回転速度を所定速度に減速させる。この第１の５番車１２２には、図７に示すように、秒針車１２３と重なる領域において周方向に等間隔（中心角α１が１２０°）で配置された３個の円形状をなす透孔１２２ｃが形成されている。この透孔１２２ｃは、光検出センサ１４０の検出光を通過させるだけでなく、少なくともその１つは、第１の５番車１２２を組付ける際の位置決め孔（度決め孔）として用いられるものである。
【００６６】
秒針車１２３は、大径歯車１２３ａの歯数が６０個に形成され、その軸部の一端が上ケース１１２に軸支され、中板１１３を下ケース１１１側に貫通したその他端側には秒針軸１２３ｂが圧入されており、この秒針軸１２３ｂは、後述する分針パイプ１３４ｐの内側に挿通されて、その先端に秒針が取り付けられている。この秒針車１２３には、図１０に示すように、回転により第１の５番車１２２と重なる領域において周方向に等間隔（中心角α２が３０°）で配置された１１個の円形状をなす透孔１２３ｃと、一箇所だけピッチの異なる位置決め遮光部１２３ｄ（透孔１２３ｃと透孔１２３ｃとの中心角が６０°）とが形成されている。そして、上記第１の５番車１２２の透孔１２２ｃが位置決め遮光部１２３ｄに対向した後に最初に透孔１２３ｃと対向する時に、秒針が正時を指すように構成されている。
【００６７】
透孔１２３ｃは、光検出センサ１４０の検出光を通過させるだけでなく、少なくともその１つは、秒針車１２３を組付ける際の位置決め孔（度決め孔）として用いられるものである。
また、これらの透孔１２３ｃの内側には、周方向に長尺で回転軸方向に突出する円弧状の付勢ばね１２３ｅが、切り欠き孔１２３ｆにより画定されている。この円弧状付勢ばね１２３ｅは、秒針車１２３をその回転軸方向に付勢するものである。
【００６８】
ここで、位置決め遮光部１２３ｄは、周方向において切り欠き孔１２３ｆから離れた位置、すなわち、２つの切り欠き孔１２３ｆが途切れて離れた領域に形成されている。したがって、切り欠き孔１２３ｆと位置決め遮光部１２３ｄとの距離を十分確保できるため、位置決め遮光部１２３ｄの領域において検出光が切り欠き孔１２３ｆに回り込むようなことはなく、確実にこの位置決め遮光部１２３ｄで検出光を遮ることができる。すなわち、検出光の回り込みによる誤検出を生じ易い切り欠き孔１２３ｆを設けた領域から離れた位置に位置決め遮光部１２３ｄが形成されていることから、この位置決め遮光部１２３ｄを秒針車１２２の回転角度位置の位置決めに用いることで、確実な位置決めを行うことができる。
【００６９】
秒針車１２３においては、図１０に示すように、複数（１１個）の透孔１２３ｃを設ける代わりに、図１１に示すように、位置決め遮光部１２３ｄと径方向において対向する位置にある透孔１２３ｃのみを残して、その他の透孔１２３ｃをそれぞれ切り欠き孔１２３ｇと一体的に開けてもよい。これによれば、検出光の通過を許容する部分において、検出光の通過をより一層確実なものとし、また、秒針車１２３を形成する材料の無駄を低減することができる。
【００７０】
第２駆動系１３０は、図２、図３、および図８に示すように、略コ字状のステータ１３１ａ、このステータ１３１ａの一方側の脚片に巻回された駆動コイル１３１ｂ、このステータ１３１ａの他方の磁極間において回動自在に配置されたロータ１３１ｃにより構成された時分針用ステッピングモータ１３１とロータ１３１ｃのピニオン１３１ｄに大径歯車１３２ａが噛合した中間歯車としての第２の５番車１３２と、この第２の５番車１３２の小径歯車１３２ｂに大径歯車１３３ａが噛合した第２伝達歯車（第３検出用歯車）としての３番車１３３と、この３番車１３３の小径歯車１３３ｂに大径歯車１３４ａが噛合した第４検出用歯車（第２指針車）としての分針車１３４と、この分針車１３４の小径歯車１３４ｂに大径歯車１３５ａが噛合した中間歯車としての日の裏車１３５と、この日の裏車１３５の小径歯車１３５ｂに噛合した第５検出用歯車（第２指針車）としての時針車１３６とにより構成されている。
ここで、時分針用ステッピングモータ１３１は、ステータ１３１ａが中板１１３に載置して固定され、ロータ１３１ｃが中板１１３と上ケース１１２とに軸支されており、制御回路１４の出力制御信号に基づいて、その回転方向、回転角度、および回転速度が制御される。
【００７１】
第２の５番車１３２は、大径歯車１３２ａの歯数が６０個、小径歯車１３２ｂの歯数が１５個に形成され、中板１１３および上ケース１１２に軸支され、その大径歯車１３２ａが時分針用ステッピングモータ１３１のロータ１３１ｃ（ピニオン１３１ｄ）と噛合して、ロータ１３１ｃの回転速度を所定速度に減速させる。なお、この第２の５番車１３２としては、前述の第１の５番車１２２を流用、すなわち、透孔１２２ｃが設けられたものを用いてもよい。これにより、部品の共用化が行え製品のコストを低減することができる。
【００７２】
３番車１３３は、大径歯車１３３ａの歯数が６０個、小径歯車１３３ｂの歯数が１０個に形成され、軸部の一端が上ケース１１２に軸支され、他端側が中板１１３を貫通した状態で回動自在に配設されており、第２の５番車１３２の回転を減速して分針車１３４に伝達する。また、３番車１３３には、図１２に示すように、回転により秒針車１２３および第１の５番車１２２と重なる領域において周方向に等間隔（中心角α３が３６°）で配置された１０個の円形状をなす透孔１３３ｃが形成されている。この透孔１３３ｃは、光検出センサ１４０の検出光を通過させるだけでなく、少なくともその１つは、３番車１３３を組付ける際の位置決め孔（度決め孔）として用いられるものである。
【００７３】
分針車１３４は、大径歯車１３４ａの歯数が６０個、小径歯車１３４ｂの歯数が１４個に形成され、その中央部には小径歯車１３４ｂが一体的に形成された分針パイプ１３４ｐが、側面視にて略Ｔ字形状をなすように形成されている。そして、分針パイプ１３４ｐの一端部が中板１１３に回動自在に軸支され、他端側の軸部は後述する時針車１３６の時針パイプ１３６ｐの内部に回動自在に挿通されている。また、分針パイプ１３４ｐは、下ケース１１１を貫通して時計の文字盤側に突出しており、その先端には分針が取り付けられている。
【００７４】
また、分針車１３４には、図１３に示すように、回転により秒針車１２３，第１の５番車１２２，３番車１３３と重なる領域において周方向に長尺な３個の円弧状透孔１３４ｃ，１３４ｄ，１３４ｅが形成されている。これら円弧状透孔１３４ｃと円弧状透孔１３４ｄとは、中心角α５で３０°隔てて形成され、円弧状透孔１３４ｄと円弧状透孔１３４ｅとは、中心角α６で３０°隔てて形成され、また、円弧状透孔１３４ｅと円弧状透孔１３４ｃとは、中心角α７で６０°隔てて形成されている。すなわち、円弧状透孔１３４ｅと円弧状透孔１３４ｃとの間に、最も幅の広い遮光部Ａが形成され、円弧状透孔１３４ｃと円弧状透孔１３４ｄとの間および円弧状透孔１３４ｄと円弧状透孔１３４ｅとの間に、上記遮光部Ａよりも幅狭の遮光部Ｂが形成されている。
【００７５】
また、円弧状透孔１３４ｃは、一端側の円形部１３４ｃ１と、他端側から伸びる幅広円弧部１３４ｃ２と、両者を連結する幅狭円弧部１３４ｃ３とにより形成されている。この幅狭円弧部１３４ｃ３により画定される円形部１３４ｃ１は、検出光を通過させるだけでなく、分針車１３４を組み付ける際の位置決め孔（度決め孔）として用いられるものである。
【００７６】
時針車１３６は、大型歯車１３６ａの歯数が４０個に形成され、その中央部に円筒状の時針パイプ１３６ｐが一体的に取り付けられており、この時針パイプ１３６ｐの内部に前述の分針パイプ１３４ｐが挿通されている。そして、時針パイプ１３６ｐは、下ケース１１１に形成された軸受け孔１１１ａに挿通されて回動自在に軸支されており、また、その先端側は下ケース１１１を貫通して時計の文字盤側に突出しており、その先端には時針が取り付けられている。
【００７７】
また、時針車１３６には、図１４に示すように、回転により秒針車１２３，第１の５番車１２２，３番車１３３，分針車１３４と重なる領域において周方向に長尺な３個の円弧状透孔１３６ｃ，１３６ｄ，１３６ｅが形成されている。これら円弧状透孔１３６ｃと円弧状透孔１３６ｄとは、中心角α８で４５°隔てて形成され、円弧状透孔１３６ｄと円弧状透孔１３６ｅとは、中心角α９で６０°隔てて形成され、また、円弧状透孔１３６ｅと円弧状透孔１３６ｃとは、中心角α１０で３０°隔てて形成されており、更に、円弧状透孔１３６ｃ，１３６ｄ，１３６ｅの長さは、中心角β１＋β２，β３，β４がそれぞれ７５°，６０°，９０°となるように設定されている。すなわち、円弧状透孔１３６ｅと円弧状透孔１３６ｃとの間に、最も幅の狭い遮光部Ｃが形成され、円弧状透孔１３６ｃと円弧状透孔１３６ｄとの間に、遮光部Ｃよりも幅の広い遮光部Ｄが形成され、円弧状透孔１３６ｄと円弧状透孔１３６ｅとの間に、遮光部Ｄよりも幅の広い遮光部Ｅが形成されている。
【００７８】
また、円弧状透孔１３６ｃは、一端側から中心角β１で７．５°のところに位置する円形部１３６ｃ１と、他端側から伸びる幅広円弧部１３６ｃ２と、両者を連結すると共に円形部１３６ｃ１の両側に位置する幅狭円弧部１３６ｃ３とにより形成されている。この幅狭円弧部１３６ｃ３により画定される円形部１３６ｃ１は、検出光を通過させるだけでなく、時針車１３６を組み付ける際の位置決め孔（度決め孔）として用いられるものである。
【００７９】
日の裏車１３５は、大径歯車１３５ａの歯数が４２個、小径歯車１３５ｂの歯数が１０個に形成され、下ケース１１１に形成された突部１１１ｂに対して回動自在に軸支されており、大径歯車１３５ａが分針パイプ１３４ｐに形成された小径歯車１３４ｂに噛合し、また、小径歯車１３５ｂが時針車１３６（１３６ａ）に噛合して、分針車１３４の回転を減速して時針車１３６に伝達する。
【００８０】
光検出センサ１４０は、図２に示すように、上ケース１１２の壁面に固定された回路基板１４１に取付けられた発光ダイオードからなる発光素子１４２と、この発光素子１４２に対向するように、下ケース１１１の壁面に固定された回路基板１４３に取付けられたフォトトランジスタからなる受光素子１４４とにより形成されている。
そして、発光素子１４２のアノードは一端がｐｎｐトランジスタＱ２のコレクタに接続されたドライブ回路１８における抵抗素子Ｒ４の他端に接続され、カソードは、接地されると共に、受光素子１４４のエミッタに接続されている。
受光素子１４４のコレクタは、制御回路１４に接続されている。この制御回路との接続ラインは、検出信号ＤＴ１の制御回路１４への出力ラインとなっており、この出力ラインは、抵抗素子Ｒ５を介して電源電圧Ｖ_ｃｃの供給ラインに接続されている。
ドライブ回路１８のトランジスタＱ２のエミッタは電源電圧Ｖ_ｃｃの供給ラインに接続され、ベースは抵抗素子Ｒ３を介してドライブ信号ＤＲ２の出力ラインに接続されている。
すなわち、発光素子１４２は、制御回路１４からロウレベルのドライブ信号ＤＲ２が出力されたとき発光するようにドライブ回路１８に接続されている。
【００８１】
また、図３に示すように、平面視にて第１の５番車１２２、秒針車１２３、３番車１３３、分針車１３４、時針車１３６の全てが同時に重なる位置に配置されている。そして、第１の５番車１２２の透孔１２２ｃ、３番車１３３の透孔１３３ｃ、秒針車１２３の透孔１２３ｃ、分針車１３４の透孔１３４ｃ（１３４ｄ、１３４ｅ）、時針車１３６の透孔１３６ｃ（１３６ｄ、１３６ｅ）が重なり合った時に、発光素子１４２から発せられた検出光が受光素子１４４により受光されて、秒針、分針、時針が正時等の位置を指していることを出力するようになっている。
【００８２】
更に、発光素子１４２は、上ケース１１２の外側に開口するように形成された第１配置部としての取付け凹部１１２ｃ内に配置されており、この取付け凹部１１２ｃの底面には、所定径の円形貫通孔１１２ｄが開けられている。この円形貫通孔１１２ｄは、発光素子１４２から発せられる検出光が末広がり状に広がる性質があるため、その広がった部分の光を遮断して収束された光のみを通過させて誤検出を防止できるようにするものである。
同様に、受光素子１４４は、下ケース１１１の外側に開口するように形成された第２配置部としての取付け凹部１１１ｃ内に配置されており、この取付け凹部１１１ｃの底面には、所定径の円形貫通孔１１１ｄが開けられている。この円形貫通孔１１１ｄは、発光素子１４２から発せられ、上記透孔を通過してきた光のみをできるだけ通過させて誤検出を防止できるようにするものである。
【００８３】
第１の５番車１２２、３番車１３３、秒針車１２３、分針車１３４、時針車１３６を取付ける場合は、所定の位置決めピンが、下ケース１１１の円形貫通孔１１１ｄ、位置決めとして用いられるそれぞれの透孔、および上ケース１１２の円形貫通孔１１２ｄを貫くように、順次に組付ける。そして、上ケース１１２および下ケース１１１を接合して一体化した後、位置決めピンを引き抜いて、貫通孔１１２ｄが位置する取付け凹部１１２ｃに発光素子１４２を取付け、また、貫通孔１１１ｄが位置する取付け凹部１１２ｃに受光素子１４４を取付ける。
【００８４】
これにより、貫通孔１１２ｄおよび１１１ｄは完全に塞がれ、上ケース１１２および下ケース１１１により画定される内部空間に外部の光が侵入するのを防止できる。したがって、外部の光が侵入することによる誤検出を防止できると共に、組付け時の位置決め孔と光検出用の透孔とを兼用していることから、これらの孔を別々に設ける場合にくらべて装置の集約化、小型化を行うことができる。
【００８５】
手動修正系１５０は、図２および図３に示すように、上述の分針車１３４の小径歯車１３４ｂおよび時針車１３６の大径歯車１３６ａに噛合する日の裏車１３５と、この日の裏車１３５の大径歯車１３５ａに噛合する歯車１５１ａを有する手動修正軸１５１とにより構成されている。この手動修正軸１５１は、上ケース１１２の外側に位置付けられて利用者が直接指を触れることのできる頭部１５１ｂと、この頭部１５１ｂから伸びて上ケース１１２に形成された開口１１２ｅを貫挿し下ケース１１１に形成された突部１１１ｅに対して軸支された柱状部１５１ｃとからなり、この柱状部１５１ｃの下方領域に歯車１５１ａが形成されている。
【００８６】
手動修正軸１５１は、分針車１３４と同位相で回転するように構成されており、上述の第２駆動系１３０により分針車１３４が駆動されているときには日の裏車１３５を介して分針車１３４と同位相で回転すると共に、第２駆動系１３０の非作動時には、頭部１５１ｂを指で回転させることにより、指針位置を手動修正できるようになっている。
【００８７】
上記のように、秒針車１２３の秒針軸１２３ｂが分針車１３４の分針パイプ１３４ｐに挿通され、分針車１３４の分針パイプ１３４ｐが時針車１３６の時針パイプ１３６ｐに挿通されていることから、秒針車１２３と、分針車１３４と、時針車１３６とは、それぞれの回転中心軸が共通しており、また、時刻表示の際に、秒針が６０秒間に１回転、分針が６０分間に１回転、時針が１２時間に１回転するように駆動される。
【００８８】
分針車１３４の分針パイプ１３４ｐの先端部および時針車１３６の時針パイプ１３６ｐの先端部には、図１５に示すように、径方向に所定幅をなして伸びる位置決めのための第１指標としての溝１３４ｇおよび第２指標としての溝１３６ｇが形成されている。そして、これらの溝１３４ｇおよび溝１３６ｇが、一直線に並んだとき所定の時刻例えば１２時００分を指すように設定されている。
【００８９】
このような位置決め指標を設けたことにより、分針車１３４および時針車１３６を下ケース１１１および上ケース１１２により囲繞して覆ってしまった後においても、溝１３４ｇおよび１３６ｇが一直線に並んでいれば予め設定された概略の時刻を指していることが分かるため、その状態を基に分針および時針を容易に取り付けることができ、その他の位置合わせおよび位置確認工程が不要になり、製造ラインおよび検査ラインでの製造時間および検査時間を短縮することができる。なお、位置決め指標としては、上記の溝に限るものではなく、ポッチ等のマークでもよい。
【００９０】
図１６は、図１に示した電波修正時計の動作を説明するためのフローチャートである。電波修正時計１の動作を図１６を参照しながら、制御回路１４の受信周波数の評価を行う動作を中心に説明する。
【００９１】
ステップＳＴ１において、制御回路１４では、例えば初期設定として、周波数４０ｋＨｚの標準電波を受信させる制御信号ＣＴＬ１１３を切換部１１３に出力して４０ｋＨｚ受信回路１１１を活性化させて信号Ｓ１１１を受信する。
【００９２】
ステップＳＴ２において、制御回路１４では、周波数選択および秒同期を含め、受信開始より３分以上経過したか否かが判別され、３分以上経過したと判別された場合には、受信周波数を確定せず（ＳＴ３）、一時受信周波数を４０ｋＨｚに設定し（ＳＴ４）、受信周波数の選択に係る処理を終了する。
【００９３】
一方、ステップＳＴ２において、制御回路１４では、長波受信回路１１０からの出力の安定待ちを行い、詳細には受信開始から５秒間経過した場合には（ＳＴ５）、標準電波を８秒間受信してサンプリングを行う（ＳＴ６）。
ステップＳＴ７において、制御回路１４では１秒毎のエッジｅｄ（両エッジ）を計測し、エッジｅｄのない秒を計測し（ＳＴ８）、図６に示したように、上記計数に基づいて評価値Ａを生成する（ＳＴ９）。
【００９４】
ステップＳＴ１０において、制御回路１４では、サンプリングタイミング毎のレベルの計測が行われ、図６に示したように”Ｌ”レベルの安定度ＳＬを評価し（ＳＴ１１）、”Ｈ”レベルの安定度ＳＨを評価し（ＳＴ１２）、上記判定結果より評価値Ｂを算出する（ＳＴ１３）。
ステップＳＴ１４において、制御回路１４では、以前の評価値Ａをメモリ１４０２に保存し、最新の評価値Ｃを算出する（ＳＴ１５）。
【００９５】
ステップＳＴ１６において、制御回路１４では、最初の受信であるか否かが判別される。最初の受信であると判別された場合には、評価値が２以下か否かが判別され（ＳＴ１７）、今回の周波数を受信用の周波数に設定し（ＳＴ１８）、秒同期処理へ進む（ＳＴ１９）。
【００９６】
一方、ステップＳＴ１７の判別において、評価値Ｃが２以上、つまり２よりも大きい場合には、標準電波の受信周波数を切換える。例えば、４０ｋＨｚから６０ｋＨｚに受信周波数を切換える制御信号ＣＴＬ１１３を標準電波信号受信系１１に出力して受信周波数を切換え（ＳＴ２０）、ステップＳＴ２の処理に戻り、切換えられた周波数で同様な処理を行う。
【００９７】
一方、ステップＳＴ１６の判別において、最初の受信ではないと判別された場合には、今回の評価値Ｃと前回の評価値Ｃとが比較され（ＳＴ２１）、比較の結果、異なる場合には、今回の評価値Ｃの方が前回の評価値Ｃよりも大きいか否かが判別され（ＳＴ２２）、今回の評価値Ｃが大きいと判別された場合には、ステップＳＴ１８の処理に進む。
【００９８】
一方、ステップＳＴ２２の判別において、今回の評価値Ｃの方が前回の評価値Ｃよりも小さいと判別された場合には、前回の周波数に確定され（ＳＴ２３）、ステップＳＴ１９の秒同期処理に進む。
一方、ステップＳＴ２１の判別において、今回の評価値Ｃと前回の評価値Ｃが一致する場合には、評価値が１５であるか否かが判別され（ＳＴ２４）、評価値が１５であると判別された場合には、受信状態が良くないと判別し、ステップＳＴ２０の処理に移行する。
【００９９】
一方、ステップＳＴ２４の判別において、評価値が１５ではないと判別された場合には、受信状態が良くないと判別し、ステップＳＴ１８の処理に移行する。
【０１００】
制御回路１４は、受信周波数が確定すると確定フラグをセットし、受信周波数の確定後、２４時間正常に受信できない場合には、確定フラグをクリアして再度、受信周波数の上述した選択処理を行う。
【０１０１】
制御回路１４では、確定した受信周波数の標準電波信号に基づいて、例えば図６（ａ）に示したように、例えば、１１１１１１００００００となるパターンを検出し、その１から０への立下りエッジｅｄ１の時が、標準電波信号のゼロ点として、内部時計１４０１の秒同期処理を行う。
その後、制御回路１４は、分同期処理、時刻コード解析処理等を行い、標準時刻に応じて制御信号ＣＴＬ１，ＣＴＬ２をステッピングモータ１２１，１３１に出力し、早送り動作を行い、指針を標準時刻に設定する。
【０１０２】
図１７は、図１に示した電波修正時計の指針位置検出処理の動作を示すフローチャートである。図１７を参照しながら指針位置検出処理を説明する。
制御回路１４から時分用パルス信号出力パターンがセットされ（ＳＴ１０１）、ドライブ信号ＤＲ２がドライブ回路１８にロウレベルで出力される。これにより、トランジスタＱ２がオンし、発光素子１４２、すなわち発光ダイオードから検出光が発せられる。
【０１０３】
続いて、制御回路１４から制御信号ＣＴＬ１が出力されて秒針用ステッピングモータ１２１がパルス駆動され（ＳＴ１０２）、受光素子１４４すなわちフォトトランジスタがオンし、検出信号ＤＴ１がハイレベル（電源電圧Ｖ_ｃｃレベル）からロウレベルに切り換わったか否かの判別が行われる（ＳＴ１０３）。
【０１０４】
ここで、フォトトランジスタからの検出信号ＤＴ１がハイレベルのままに保持されている場合には、ステップ駆動を行うためにパルス数を加算する度に、フォトトランジスタからの検出信号ＤＴ１がハイレベル（電源電圧Ｖ_ｃｃレベル）からロウレベルに切り換わったか否かの判別が行われる（ＳＴ１０４〜ＳＴ１０６）。
そして、パルス数が９に達してもフォトトランジスタからの検出信号ＤＴ１出力がハイレベル（電源電圧Ｖ_ｃｃレベル）からロウレベルに切り換わらない場合には、時分針用ステッピングモータ１３１が１ステップ（パルス）駆動され（ＳＴ１０７）、その後再び秒針用ステッピングモータ１２１がステップ駆動され（ＳＴ１０２）て、秒針車１２３が回転駆動される。
【０１０５】
一方、ステップＳＴ１０３において、フォトトランジスタによる検出信号ＤＴ１がハイレベルからロウレベルに切り換わったと判別されると、秒針車１２３が早送りされ（ＳＴ１０８）、制御回路１４に予め記憶された出力パターンとの比較が行われる（ＳＴ１０９）。
比較の結果、得られた出力パターンと記憶された出力パターンとが適合しない場合は、ステップＳＴ１０８に戻り、再び秒針車１２３が早送りされる。
【０１０６】
一方、得られた出力パターンと記憶された出力パターンとが適合した場合には、その時点（５ステップ目でもフォトトランジスタにより検出信号ＤＴ１のレベルがロウレベルに切り換わらない場合において次にフォトトランジスタの出力がロウレベルに切り換わった時点）で、制御信号ＣＴＬ１の出力が停止されて、秒針車１２３の回路駆動が停止される。そして、秒針車１２３が帰零位置で停止する（ＳＴ１１０）。このとき、秒針は所定時刻例えば正時（０秒）の位置に修正され、秒針の原点検索処理が終了する。
【０１０７】
続いて、制御回路１４から制御信号ＣＴＬ２が出力されて時分針用ステッピングモータ１３１のみが所定の出力周波数でパルス駆動されて分針車１３４が早送りされる（ＳＴ１１１）。
【０１０８】
そして、フォトトランジスタからの出力パターンと制御回路１４に予め記憶された出力パターンとの比較が行われる（ＳＴ１１２）。
比較の結果、得られた出力パターンと記憶された出力パターンとが適合しない場合は、ステップＳＴ１１１の処理に戻り、再び分針車１３４が早送りされる。
【０１０９】
一方、ステップＳＴ１１２の比較の結果、得られた出力パターンと記憶された出力パターンとが適合した場合は、その時点で、制御信号ＣＴＬ２の出力が停止されて、時分針用ステッピングモータ１３１が停止されて、分針車１３４および時針車１３６の駆動が停止される（ＳＴ１１３）。
【０１１０】
ここで、出力パターンと予め記憶された出力パターンとの比較による時分針車の位置検出処理は、３種類のパターンのいずれかに合わせることにより行われる。
【０１１１】
図１８は、図１に示した電波修正時計の検出光の出力パターンを説明するための図である。
すなわち、分針車１３４によるフォトトランジスタの出力パターンは、図１８（ａ）に示すように、遮光部が作用するオフの幅として、２つの幅狭のＢ部と１つの幅広のＡ部とが交互に現れるようなパターンとなり、また、時針車１３６によるフォトトランジスタの出力パターンは、図１８（ｂ）に示すように、遮光部が作用するオフの幅が３種類のＤ部、Ｅ部、Ｃ部が所定間隔をおいて交互に現れるようなパターンとなり、両者を合成した出力パターンは、図１８（ｃ）に示すように、Ｄ部，Ｂ部およびＡ部が組み合わされたパターンと、Ｅ部，Ｂ部およびＡ部が組み合わされたパターンと、Ｃ部，Ｂ部およびＡ部が組み合わされたパターンの３種類が所定の間隔をおいて現れるパターンとなる。
なお、図１８に示すパターンのうちオンとなるパターンの部分は、実際には３番車１３３の遮光部によりオフとなる部分があるので、歯抜け状のパターンとなっている。
【０１１２】
また、例えば分針車１３４および時針車１３６の基準位置として、図１８に示すように、０時００分、４時００分、および８時００分の位置に設定されている。
【０１１３】
Ｄ部，Ｂ部およびＡ部の組み合わせからなるパターンが確認されたときを例えば４時００分、Ｅ部，Ｂ部およびＡ部の組み合わせからなるパターンが確認されたときをたとえば８時００分、Ｃ部，Ｂ部およびＡ部の組み合わせからなるパターンが確認されたときを、たとえば１２時００分として予め設定しておけば、これらのパターンのいずれかを検出したときに、時分針用ステッピングモータ１３１を停止させることで、分針車１３４および時針車１３６すなわち分針および時針を所定の時刻に時刻修正することができる。
【０１１４】
そして、時分針用ステッピングモータ１３１を停止させた後、制御回路１４によるドライブ信号ＤＲ２がハイレベルに切り換えられる。
これにより、ドライブ回路１８のトランジスタＱ２がオフし、発光ダイオードの発光が停止され（ＳＴ１１４）、時刻修正動作を終了する。
【０１１５】
また、剣付けモードの際に、時分針車の原点検索処理が短くなるような出荷位置ＴＳ、本実施形態では１０時３０分に設定する場合を図１８を参照しながら説明する。
例えばユーザが外部電池を投入すると、制御回路１４は、位相合わせ処理、秒針原点検索処理、分針原点検索処理、および時刻合わせ処理を行う。出荷位置ＴＳとして１０時３０分に設定した場合、図１８に示したように、出荷位置ＴＳから秒針車および時分針車を駆動させて検出光を貫通させた後、、時分針を止めて秒針原点検索を行う。その後時分針車を回転させて、光センサ部１４０でＣ部を検出することで、略１２時の位置あることを検出し、Ｂ部およびＡ部を検出した時点で停止させることにより、時分針が所定の基準位置１２時００分に設定される。
【０１１６】
例えば、この１０時３０分の位置は、時分針車を基準位置に設定する際に原点検索処理を行う際に、参照される必要最小限必要なオンオフパターンを検出する位置である。この位置に出荷時の指針を設定することにより、原点検索処理の時間が最も短い。
【０１１７】
図１９は、図１に示した電波修正時計の動作を示すフローチャートである。
工場内に設置した４０ｋＨｚ発信装置でエージングや機能検査を行い、正確な時刻は６０ｋＨｚ発信装置で送信する。この順番は、通常受信時の周波数選択が４０ｋＨｚから行い、剣付けモード時には６０ｋＨｚから行い周波数選択にかかる時間を削減している。
【０１１８】
剣付けモード時の動作について説明する。
ステップＳＴ２０１において、制御回路１４は、モータに初期化パルスを出力し、運針方向の初期化を行い、通常の運針を禁止する（ＳＴ２０２）。
ステップＳＴ２０３において、制御回路１４では、標準電波信号受信系１１に電源を供給して、標準電波の受信を開始させる。
ステップＳＴ２０４において、制御回路１４では、駆動信号ＣＴＬ１およびＣＴＬ２を出力し、光センサ１４０により検出される光パターンに基づいて、秒針車および時分針車の原点検索を開始する。
【０１１９】
ステップＳＴ２０５において、制御回路１４では、秒針車および時分針車の原点検索が完了すると、駆動信号ＣＴＬ１およびＣＴ２を駆動して、０時０分０秒の駆動位置への指針の移動を開始する（ＳＴ２０６）。
ステップＳＴ２０７において、制御回路１４では、指針が０時０分０秒に移動が完了したと判別した場合には、時刻修正スイッチがオン状態であるか否かが判別される（ＳＴ２０８）。
【０１２０】
ステップＳＴ２０８において、制御回路１４では、時刻修正時計がオン状態ではないと、判別した場合には、押し込み時間をクリアし（ＳＴ２０９）、２秒未満（クリア前）か否かが判別され（ＳＴ２１０）、２秒未満でないと判別された場合にはステップＳＴ２０８の処理に戻る。
一方、ステップＳＴ２１０の判別において、２秒未満であると判別されると次の原点へ検索が開始され（ＳＴ２１１）、検索が完了した場合には、ステップＳＴ２０８の処理に戻る。
【０１２１】
一方、ステップＳＴ２０８の判別において、時刻修正スイッチがオン状態の場合には、時刻修正スイッチのオン状態からオフ状態への切換エッジの検出を行い（ＳＴ２１３）、時刻修正スイッチの押し込み時間が計測され（ＳＴ２１４）、ステップＳＴ２０８の処理に戻る。
【０１２２】
一方、ステップＳＴ２１３の判別において、時刻修正スイッチのオフ状態からオン状態への切換エッジが検出されない場合には、２秒以上経過したか否かが判別され（ＳＴ２１５）、２秒以上経過していないと判別された場合には、ステップＳＴ２０８の処理に戻る。
【０１２３】
一方、ステップＳＴ２１５の判別において、２秒以上経過したと判別した場合には、受信完了か否かが判別され（ＳＴ２１６）、受信完了していない場合にはステップＳＴ２０８の処理に戻る。
【０１２４】
一方、ステップＳＴ２１６の判別において、受信が完了したと判別された場合には、出荷針位置移動処理に移行する。
出荷針位置移動処理を説明する。
ステップＳＴ２１７において、制御回路１４では、初期設定として受信周波数を４０ｋＨｚとする場合には、駆動信号ＣＴＬ１を秒針用モータに出力して秒針を２０秒の位置へ移動させ（ＳＴ２１８）、ステップＳＴ２２０の処理に進む。初期設定として受信周波数を６０ｋＨｚとする場合には、駆動信号ＣＴＬ１を秒針用モータに出力して、秒針を３０秒へ移動させ（ＳＴ２１９）、ステップＳＴ２２０の処理に進む。
【０１２５】
ステップＳＴ２２０において、制御回路１４では、駆動信号ＣＴＬ２を出力して、時分針を１０時３０に移動させる。
この１０時３０分の位置は、出荷後に例えばユーザが電池を印加した場合には、原点検索時間が短い位置である。原点検索処理は、光検出センサ部１４０により検出される、光パターンに基づいて行うため、原点検索を行うのに必要最小限の所定のパターンが得られる位置に時分針をセットする。
【０１２６】
ステップＳＴ２２１において、制御回路１４では、時刻修正スイッチがオン状態か否かが判別され、オン状態でないと判別され、時分針の移動が完了した場合（ＳＴ２２２）には、一連の剣付けモードの処理を終了し、待機モードに移行する。
【０１２７】
一方、ステップＳＴ２２１の判別において、時刻修正スイッチがオン状態でないと判別された場合には、更に２秒（計４秒）経過したか否かが判別され（ＳＴ２２３）、経過していない場合には、ステップＳＴ２２１の処理に戻る。
【０１２８】
一方、ステップＳＴ２２２の処理において、更に２秒経過したと判別された場合には、制御回路１４では、内部時計１４０１で計時されている時刻に基づいて、駆動信号ＣＴＬ１およびＣＴＬ２を出力し、時分秒針を現時刻へ移動を開始する。この際、制御回路１４は、２秒運針を許可する（ＳＴ２２５）。
【０１２９】
ステップＳＴ２２６において、制御回路１４では、時刻修正スイッチがオン状態で、スイッチのオフ状態からオン状態への切換エッジ検出された場合には（ＳＴ２２７）、２秒運針を禁止し（ＳＴ２２８）、ステップＳＴ２１７の処理に進む。
一方ステップＳＴ２２６の判別において時刻修正スイッチがオン状態が検出されない場合、およびステップＳＴ２２７の処理において、エッジが検出されない場合には、ステップＳＴ２２６の処理に戻る。
【０１３０】
以上説明したように、剣付けモード時に時刻修正を行い所定の位置に指針を停止させるので、その停止している針位置から出荷時に時刻修正が行われたことが確認できる。また、原点検索に要する時間を最短とすることができる。
【０１３１】
図２０は、図１に示した電波修正時計の動作を説明するためのフローチャートである。図２０を参照しながら、電波修正時計１の動作、例えば外部電池が印加された場合の動作を説明する。
【０１３２】
ステップＳＴ３０１において、内部電池２０２により、内部時計１４０１で計時されている時刻情報が保持されている。
この内部時計１４０１の時刻情報は、例えば電波修正時計１の製品出荷前に予め設定する。また、指針の位置が原点検索処理の検索時間が短い位置に設定されている。
【０１３３】
ステップＳＴ３０２において、制御回路１４では、外部電池が検出されたか否かが判別される。詳細には、制御回路１４では電源部２００から外部電源が印加されたことを示す信号Ｓ２２が出力されると、内部電池２０２を未接続状態にさせる制御信号Ｓ２２を電源部２００に出力して電源部２００に内部電池２０２を未接続状態にさせる（ＳＴ３０３）。
【０１３４】
ステップＳＴ３０４において、制御回路１４では、駆動信号ＣＴＬ１およびＣＴＬ２を出力し、秒針駆動系１２０および時分針駆動系１３０を駆動し、それぞれに設けられた遮光部および透光部による光のパターンに基づいて、上述したように指針車の原点検索処理が行われる。
【０１３５】
ステップＳＴ３０５において、制御回路１４では、その内部電池２０２により保持されている内部時計１４０１の時刻情報に基づいて、駆動信号ＣＴＬ１およびＣＴＬ２を出力し、指針による時刻表示を行う。
【０１３６】
ステップＳＴ３０６において、制御回路１４は、標準電波受信系１１に標準電波信号を受信させ（ＳＴ３０６）、受信された標準電波信号に基づいて、内部時計１４０１で計時される時刻情報を修正し、修正の結果に基づいて駆動信号ＣＴＬ１およびＣＴＬ２を駆動して、指針による時刻表示を修正する（ＳＴ３０７）。
【０１３７】
以上説明したように、外部電池２０１の投入を検出する電源部２００と、内部電池２０２により計時時刻が保持される内部時計１４０１と、複数の基準位置を有し、透光部および遮光部を含む秒針車、分針車、および時針車を駆動する秒針駆動系１２０および時分針駆動系１３０と、指針車の透光部および遮光部に基づいて、指針車の基準位置および指針位置に応じた前記検出信号を検出する光センサ部１４０と、電源部２００が外部電池２０１の投入を検出した場合には、秒針駆動系１２０および時分針１３０を駆動して、光センサ部１４０の検出信号に基づいて位相合せの後、秒針原点検索、時分針原点検索を行った後、内部時計１４０１の計時時刻に基づいて指針車の指針位置を設定して指針による時刻表示を行い、外部電池２０１の投入前には、指針車の指針位置を複数の基準位置の間に設定する制御回路１４０とを設けたので、初期時に、短時間で正確な時刻表示を行うことができる。
【０１３８】
また、指針位置により出荷時に時刻設定がされたことが確認でき、外部電池２０１が投入された場合には、原点検索に要する時間を最短とすることができる。
【０１３９】
なお、本発明は本実施形態に限られるものではなく、任意好適な種々の変更が可能である。
本実施形態では、剣付けモード時に１０時３０分に指針位置を設定したが、この形態に限られるものではない。
例えば本実施形態では指針車に形成された、透光部および遮光部とが回転することにより生成される、光のオン／オフパターンを検出したが、指針車に設けられた透光部および遮光部を異なった設置位置に設け、原点検索のために必要最小限のオン／オフパターンを検出できるような位置に指針を停止することで、より短時間に原点位置を検出し、内部時計の計時時刻に応じた時刻に、より短時間で設定することができる。
【０１４０】
また、本実施形態では、１０時３０分に出荷時の指針位置を設定したが、この形態に限られるものではない。例えば、出荷時の指針位置が、８時００分から１０時３０分までの間であれば、外部電源投入時に、Ｃ部、Ｂ部、Ａ部を検出することで、０時００分の基準位置を短時間に検出することができる。この際、出荷時の指針位置を、例えばＣ部、Ｂ部、Ａ部を検出することができる最小の位置に設定することが好ましい。
【０１４１】
また、本実施形態では基準位置として０時００分に設定したが、この形態に限られるものではない。例えば４時００分や８時００分でもよい。例えば、４時００分に設定する場合には、２時１０頃に出荷時の指針位置を設定することで、Ｄ部、Ｂ部、Ａ部を短時間で検出することができる。また、８時００分に設定する場合には、５時４０分頃に出荷時の指針位置を設定することで、Ｅ部、Ｂ部、Ａ部を短時間で検出することができる。
【０１４２】
【発明の効果】
本発明によれば、初期時に、短時間で正確な時刻表示を行うことができる電波修正時計を提供することにある。
【図面の簡単な説明】
【図１】本発明に係る電波修正時計の一実施形態の電気的な機能ブロック図である。
【図２】図１に示した電波修正時計の構成図である。
【図３】図２に示した電波修正時計の断面の拡大図である。
【図４】本発明に係る制御回路における電波受信状態を説明するための図である。
【図５】標準時刻電波信号の時刻コードの一例を示している。（ａ）は毎時１５，４５分以外のフォーマット、（ｂ）は毎時１５分，４５分のフォーマットを示す。
【図６】図１に示した電波修正時計の受信状態に応じた評価値の生成処理を説明するための図である。
【図７】電波修正時計の一部である秒針を駆動する第１駆動系を示す平面図である。
【図８】電波修正時計の一部である分針および時針を駆動する第２駆動系を示す平面図である。
【図９】秒針を駆動する第１駆動系の一部をなす第１の５番車を示す平面図である。
【図１０】秒針を駆動する第１駆動系の一部をなす秒針車を示す平面図である。
【図１１】秒針を駆動する第１駆動系の一部をなす秒針車の他の例を示す平面図である。
【図１２】分針および時針を駆動する第２駆動系の一部をなす３番車を示す平面図である。
【図１３】分針および時針を駆動する第２駆動系の一部をなす分針車を示す平面図である。
【図１４】分針および時針を駆動する第２駆動系の一部をなす時針車を示す平面図である。
【図１５】分針パイプおよび時針パイプの先端部を示す端面図である。
【図１６】図１に示した電波修正時計の動作を説明するためのフローチャートである。
【図１７】修正動作において、分針車、時針車、および両者の合成による検出出力パターンを示す図である。
【図１８】図１に示した電波修正時計の検出光の出力パターンを説明するための図である。
【図１９】図１に示した電波修正時計の動作を示すフローチャートである。
【図２０】図１に示した電波修正時計の動作を説明するためのフローチャートである。
【符号の説明】
１…電波修正時計、１１…標準電波受信系、１１ａ…受信アンテナ、１１０…長波受信回路、１１１…４０ｋＨｚ受信回路、１１２…６０ｋＨｚ受信回路、１２…スイッチ、１３…発振回路、１４…制御回路、１５…ドライブ回路、１６…発光素子、１７…バッファ回路、１００…時計本体、１１１…下ケース、１１２…上ケース、１１３…中板、１２０…第１駆動系（秒針駆動系）、１２１…秒針用ステッピングモータ（第一駆動源）、１２２…第１の５番車（第一伝達歯車、第一検出用歯車）、１２２ｃ…透孔、１２３…秒針車（第２検出用歯車、第一指針車）、１２３ｃ…透孔、１２３ｄ…位置決め遮光部、１２３ｅ…付勢ばね、１２３ｆ…切り欠き孔、１２３ｇ…切り欠き孔、１３０…第２駆動系（時分針駆動系）、１３１…時分針用ステッピングモータ（第２駆動源）、１３２…第２の５番車、１３３ｃ…透孔、１３４…分針車（第４検出用歯車、第２指針車）、１３４ｃ…円弧状透孔、１３４ｄ…円弧状透孔、１３４ｅ…円弧状透孔、１３４ｇ…溝（第１指標）、１３４ｐ…分針パイプ、１３５…日の裏車、１３６…時針車（第５検出用歯車、第２指針車）、１３６ｃ…円弧状透孔、１３６ｄ…円弧状透孔、１３６ｅ…円弧状透孔、１３６ｇ…溝（第２指標）、１３６ｐ…時針パイプ、１４０…光検出センサ、１４２…発光素子、１４３…回路基板、１４４…受光素子、１５０…手動修正系、１５１…手動修正軸、１５１ｂ…頭部、２００…電源部、２０１…外部電池、２０２…内部電池、１４０１…内部時計、１４０２…メモリ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio-controlled timepiece that detects the position of a pointer and corrects the time based on a standard radio signal, for example.
[0002]
[Prior art]
For example, a standard radio wave transmission frequency of 40kHz from the standard radio wave transmission station of Mt. Otakaya on the border between Tamura-gun, Fukushima Prefecture and Kawauchi-mura, Futaba-gun. A standard radio wave with a frequency of 60 kHz is transmitted from the station. This standard radio wave includes a standard time code including a time code, a cumulative code, a day code, and a year code.
[0003]
A radio-controlled timepiece that corrects the time display by a hand based on a standard time code (also referred to as a standard time signal) included in the standard radio wave is known (for example, see Patent Document 1).
For example, in the radio-controlled timepiece described above, the rotating hand wheel is provided with a light transmitting part and a light shielding part for detecting the rotational position, and the detection light is blocked by the light shielding part and detected via the light transmitting part. The rotational position of the pointer is detected based on the light pattern.
[0004]
[Patent Document 1]
JP 2002-228775 A (FIG. 1-19)
[0005]
[Problems to be solved by the invention]
In a conventional radio-controlled timepiece, at the initial stage, for example, when a user purchases a radio-controlled timepiece and inserts a battery as a power source, the rotation position of the pointer is detected and set to the initial position. The time is displayed by fast-forwarding the pointer according to the standard time signal. Further, the display time is corrected based on the standard radio signal at a predetermined time.
[0006]
As described above, in the conventional radio-controlled timepiece, the position of the pointer is detected after the power is turned on at the initial stage, and the display time is corrected according to the received signal. Therefore, it takes time to display the accurate time. It takes.
In addition, the operation of detecting the position of the pointer by rotating the pointer wheel is incomprehensible for the user and takes time, so improvement is desired.
[0007]
The present invention has been made in view of such circumstances, and an object thereof is to provide a radio-controlled timepiece capable of performing accurate time display in a short time at the initial stage.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the radio-controlled timepiece according to the present invention is a radio-controlled timepiece that keeps the time of an internal clock and corrects the time according to a standard time radio signal, and detects the turning on of an external power supply. An external power source detecting means; a pointer driving system for driving a pointer wheel provided with a plurality of reference positions; a reference position detecting means for detecting the reference position of the pointer wheel; and When the insertion is detected, the pointer driving system is driven, the pointer wheel is set to the reference position based on the detection process of the reference position detecting means, and then based on the time measured by the internal clock Control means for setting a pointer position of the pointer wheel and setting the pointer position of the pointer wheel between the plurality of reference positions before the external power supply is turned on.
[0009]
According to the radio-controlled timepiece of the present invention, the external power source detection means detects the turning on of the external power supply, the pointer drive system drives the pointer wheel provided with a plurality of reference positions, and the reference position detection means detects the reference wheel reference. Detect position.
In the control means, when the external power supply detecting means detects the turning on of the external power supply, the pointer driving system is driven to set the pointer wheel to the reference position based on the detection processing of the reference position detecting means, and then the internal clock The pointer position of the pointer wheel is set on the basis of the measured time, and the pointer position of the pointer wheel is set between a plurality of reference positions before the external power is turned on.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an electrical functional block diagram of an embodiment of a radio-controlled timepiece according to the present invention. FIG. 2 is a configuration diagram of the radio-controlled timepiece shown in FIG. FIG. 3 is an enlarged view of a cross section of the radio-controlled timepiece shown in FIG.
[0011]
As shown in FIG. 1, the radio-controlled timepiece 1 according to the present embodiment includes a standard radio wave receiving system 11, a time correction switch 12, an oscillation circuit 13, a control circuit 14, a drive circuit 15, a light emitting element 16 as a notification means, and a buffer. Circuit 17, drive circuit 18, watch body 100, second hand motor 121, hour / minute hand motor 131, light detection sensor unit 140, manual correction system 150, power supply unit 200, external battery 201, internal battery 202, transistors Q1, Q2, And resistance elements R1 to R2.
The light detection sensor unit 140 corresponds to a reference position detection unit according to the present invention, and the power supply unit 200 corresponds to an external power supply detection unit according to the present invention.
[0012]
The standard radio wave reception system 11 receives, for example, a standard radio wave including standard time information (also referred to as a time code) transmitted from the reception antenna 11a and a standard radio wave transmission station (not shown), performs a predetermined process, and performs a pulse signal. A long wave receiving circuit 110 that outputs to the control circuit 14 as S11 is included.
The long wave reception circuit 110 includes, for example, an RF amplifier, a detection circuit, a rectification circuit, and an integration circuit (not shown).
[0013]
In order to receive a plurality of different frequencies, the long wave receiving circuit 110 includes, for example, a 40 kHz receiving circuit 111, a 60 kHz receiving circuit 112, and a switching unit 113 as shown in detail in FIG.
[0014]
The 40 kHz receiving circuit 111 demodulates a standard radio wave with a frequency of 40 kHz from the receiving antenna 11a and outputs a received signal S111. The 60 kHz receiving circuit 112 demodulates a standard radio wave having a frequency of 60 kHz from the receiving antenna 11a and outputs a received signal S112.
[0015]
The switching unit 113 switches between the 40 kHz receiving circuit 111 and the 60 kHz receiving circuit 112 in accordance with the control signal CTL 113 from the control circuit 14.
For example, as shown in FIG. 1, the switching unit 113 includes a terminal 113a, a terminal 113b, and a terminal 113c.
The switching unit 113 connects the terminal 113a and the terminal 113c when receiving the control signal CTL113 for switching from the control circuit 14 to the 40 kHz receiving circuit 111, and receives the control signal CTL113 for switching from the control circuit 14 to the 60kHz receiving circuit 112. In this case, the terminals 113b and 113c are connected, and the reception signals from the 40 kHz reception circuit 111 and the 60 kHz reception circuit 112 are alternatively output to the control circuit 14 as the signal S11.
[0016]
In addition, the long wave standard radio wave which is received by the standard radio wave receiving system 11 and accurately conveys the Japanese standard time is transmitted in the following form.
Specifically, the time code is composed of three types of signal patterns of 1, 0, and P, and is distinguished by a 100% amplitude period width in one signal pattern of 1 sec. 1, 0 and P are 500 ms, 800 ms, and 200 ms, respectively. It has become. The modulation method is amplitude modulation with a maximum value of 100% and a minimum value of 10%.
When the reception state is good, the standard radio wave receiving system 11 outputs a signal S11 to the control circuit 14 as a pulse signal corresponding to the standard radio wave signal.
[0017]
Japanese standard radio waves are operated by the Communications Research Laboratory (CRL), a standard radio transmitter that transmits standard radio waves with a frequency of 40 kHz, and standard radio wave transmitters that transmit standard radio waves with a frequency of 60 kHz. A place is provided.
The standard radio wave received by the standard radio signal receiving system 11 is sent in a form as shown in FIG.
[0018]
Specifically, the time code is composed of three types of signal patterns of 1, 0, and P, and is distinguished by a 100% amplitude period width in one signal pattern of 1 sec. 1, 0 and P are 500 ms, 800 ms, and 200 ms, respectively. It has become. The modulation method is amplitude modulation with a maximum value of 100% and a minimum value of 10%.
[0019]
When the reception state is good, the standard radio signal reception system 11 outputs a signal S11 as a pulse signal corresponding to the standard radio signal to the control circuit 14 as shown in FIG. 4B.
[0020]
The signal S11 is composed of, for example, a high level corresponding to the first level and a low level corresponding to the second level. The control circuit 14 performs reception state evaluation processing as described later based on the high level and the low level, the falling edge ed1 from the high level to the low level, and the rising edge ed2 from the low level to the high level. When the edges ed1 and ed2 are not distinguished, they are simply referred to as edges ed.
[0021]
Next, transmission data of the long wave standard radio wave will be described.
FIG. 5 shows an example of the time code of the standard time radio signal. FIG. 5A shows a format other than 15/45 minutes, and FIG. 5B shows a format of 15 minutes and 45 minutes.
The transmission information is the accumulated date from minutes, hours, and January 1st.
The time data is transmitted at 1 bit / sec. One frame is one frame, and information on the accumulated date from the above-mentioned minute / hour / January 1 is provided as a BCD code in this frame. In addition to the 0 · 1, the transmitted data includes a marker called P code. This P code has several locations in one frame, and the minute (0 seconds), 9 seconds, 19 seconds, 29 seconds, Appears at 39, 49, 59 seconds. This P code appears continuously only once at 59 seconds and 0 seconds in one frame, and the position where this P code appears continuously becomes the minute position. In other words, since time data such as minute / hour data is determined in the frame with reference to this minute position, time data cannot be extracted unless this minute position is detected.
[0022]
The reception correction switch 12 is operated, for example, when shifting to the sword mounting mode when the hour / minute / second hand is mounted in the assembly process before shipment, and outputs the signal S12 to the control circuit 14. When the reception correction switch 12 is operated and the signal S12 is input, the control circuit 14 shifts to the sword mounting mode.
The reception correction switch 12 corresponds to setting signal output means according to the present invention.
[0023]
In the sword attachment mode, the control circuit 14 sets at least the time measured by the internal clock 1401 and sets the pointer at the time setting display position indicating that the time measured by the internal clock 1401 has been set. By doing so, for example, at the time of shipment, the time information of the internal clock 1401 is set with the hands held by the internal battery 202 in a state where the current time information is set in the internal clock 1401 and the external battery 201 is removed. Is set to the time setting display position indicating that
[0024]
The oscillation circuit 13 includes a crystal oscillator CRY and capacitors C2 and C3, and supplies a basic clock having a predetermined frequency to the control circuit 14.
[0025]
The control circuit 14 has an internal clock 1401 and a memory 1402.
The internal clock 1401 includes, for example, an hour counter, a minute counter, and a second counter.
[0026]
The memory 1402 is used as a work space of the control circuit 14, for example. For example, the memory 1402 includes a RAM (Random access memory) or the like.
[0027]
The control circuit 14 performs the phase detection process of the hour / minute hand wheel and the second hand wheel, the origin search process of the second hand, the origin search process of the hour / minute hand, and detects the position of each hand wheel after a predetermined time. Set a guideline.
[0028]
For example, the phase adjustment processing is performed by setting the hour / minute hands to a position where the light output from the light emitting element 142 passes through the light transmitting portion provided in the hour / minute hand wheel and the light transmitting portion provided in the second hand wheel. Drive the car and the second hand wheel.
In the second hand origin search process, the light output from the light emitting element 142 is received by the light receiving element 144 by the light shielding portion and the light transmitting portion provided in the second hand wheel, and the origin is searched based on the light on / off pattern. The
As will be described later, the hour / minute hand origin search process is a light on / off pattern in which the light output from the light emitting element 142 is received by the light receiving element 144 by the light shielding portion and the light transmitting portion provided in the hour / minute hand wheel. The position is searched based on.
[0029]
In the swording mode, for example, in the assembling process, the control circuit 14 stops the pointer wheel to which each pointer is attached by rotating it to the reference position of 0 hour 0 minute 0 second in order to attach the hour, minute and second hands. At the reference position, the hour, minute and second hands are attached so that they become 0 hours, 0 minutes, and 0 seconds.
For example, the reference position is provided at 0:00, 4:00, and 8:00, but in this embodiment, 0:00 is used as the reference position.
[0030]
In the sword mode, the control circuit 14 causes the long wave reception system 11 to receive a standard radio signal, for example, and the time information of the internal clock 1401 is set based on the standard radio signal. Further, the control circuit 14 sets the pointer position of the pointer wheel provided with the pointer between a plurality of reference positions provided on the pointer wheel as will be described later. For example, when the origin search process of the hour / minute hand wheel is rotated in a predetermined direction and the reference position is set to 0:00, the pointer position of the pointer wheel is changed between 8:00 and the reference position in the opposite direction. Set.
[0031]
Further, the control circuit 14 moves the pointer to a position where the origin search time is short in the above-described origin search process performed when an external power supply is applied by the user. Specifically, in order to perform the origin search process based on the light on / off pattern detected by the light detection sensor unit 140 by rotating the pointer wheel provided with the light transmitting part and the light shielding part as described above, By stopping the pointer at a position where the minimum on / off pattern necessary for origin detection processing can be detected, the origin search processing can be performed in a short time when the external power supply is turned on and initial operation is performed. Yes.
[0032]
The control circuit 14 monitors the power supply via the power supply unit 200.
The power supply unit 200 detects the connection of the external battery 201 by monitoring the voltage, for example, and outputs a detection signal S21 to the control circuit 14.
In addition, when the external battery 201 is not connected, the power supply unit 200 connects the power supply from the internal battery 202 to the control circuit 14 according to the control signal S22 from the control circuit 14, for example. The time information measured by the internal clock 1401 is held by the internal battery 202 even when the external battery 201 is not connected.
[0033]
When the external battery 201 is connected, the external power source 200 brings the internal battery 202 into an unconnected state, for example, in response to a control signal S22 from the control circuit 14.
When the detection signal S21 indicating that the external battery 201 has been detected is output from the power supply unit 200, the control circuit 14 performs an origin detection process of the pointer wheel and a drive signal corresponding to the time information timed by the internal clock 1401 CTL1 and CTL2 are output and the time is displayed by the hands.
[0034]
The control circuit 14 performs sampling (for example, 32 Hz) of a standard radio wave reception signal for a predetermined time, for example, 8 seconds in this embodiment, and determines the reception state based on the sampling result.
[0035]
Specifically, the control circuit 14 outputs, for example, a control signal CTL 113 for selecting the 40 kHz receiving circuit 111 to the switching unit 113, performs sampling (for example, 32 Hz) of the standard radio wave signal S111 output from the 40 kHz receiving circuit 111, An edge ed is detected, and an evaluation value A is generated based on the presence / absence and number of the edge ed.
[0036]
Further, the control circuit 14 obtains the sum of the high level or the low level at each sampling timing within a predetermined time, for example, 1 second, and evaluates according to the fluctuation of the standard time signal and the amount of noise based on the sum value. Generate the value B. This evaluation value B indicates the stability of the reception state.
[0037]
The control circuit 14 evaluates the reception state based on the evaluation value A and the evaluation value B, for example, based on the total evaluation value (evaluation value A + evaluation value B).
For example, when the control circuit 14 determines that the reception state is good based on the evaluation value A and / or the evaluation value B described above, the control circuit 14 sets the frequency of the standard radio wave in the good reception state of the standard radio signal reception system 11. Set to receive frequency.
[0038]
In the case of an unsatisfactory reception state, the control circuit 14 outputs a control signal CTL113 to switch the reception frequency of the standard radio signal reception system 11, and similarly evaluates the evaluation value A based on the 60 kHz standard radio wave reception state. And the evaluation value B is generated, compared with the evaluation value A and the evaluation value B indicating the reception state of the standard radio wave at the previous reception frequency, and the standard radio wave signal reception system 11 is set to the reception frequency with the better reception state.
The control circuit 14 performs second synchronization detection processing and time correction processing according to a standard time signal included in the standard radio wave received by the standard radio signal reception system 11 with the set reception frequency.
[0039]
The control circuit 14 also performs second synchronization processing based on the above-described sampled data for 8 seconds. In this case, overhead due to frequency selection can be suppressed.
[0040]
FIG. 6 is a diagram for explaining an evaluation value generation process according to the reception state of the radio-controlled timepiece shown in FIG.
FIG. 6A is a diagram showing the sampling result of the received signal, FIG. 6B is a diagram for explaining the generation process of the evaluation value A, and FIG. 6C is the generation process of the evaluation value B. It is a figure for demonstrating.
[0041]
For example, the control circuit 14 samples a standard radio wave having a predetermined reception frequency in the memory 1402 at a predetermined sampling frequency, for example, 32 Hz. FIG. 6A shows the signal intensity sampled for one second on the horizontal axis when the sampled signal intensity is “1” when the signal is high and “0” when the signal is low.
For example, when the received signal is sampled from the 0th second by the second counter of the internal clock 1401, for example, as shown in the first row of FIG. 6A, 0,0,1,1,1,1,1, 1,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 Receive.
[0042]
In the next 1 second, as shown in the second row, 1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,1,1,1,1,1,1,1,1 are received.
Thereafter, the second to eighth seconds are similarly received. At this time, for example, the memory 1402 is used as a ring memory.
In the present embodiment, as shown in FIG. 6A, a reception result in a good reception state when the zero second position of the standard radio wave and the internal clock 1401 are shifted by about 0.25 seconds is shown.
[0043]
The control circuit 14 detects the low level “0” from the low level “0” and the low level “0” from the high level “1” of the received signal, sets each to the edge ed, and there is no edge ed every second. 1. If there is an edge, x0 to x7 are generated as 0, and the total number X of x0 to x7 is calculated. For example, as shown in FIG. 6, 0 to 8 seconds are 0, and the total number X is 0.
[0044]
The control circuit 14 detects the number of edges y0 to y7 every second and adds the number of edges y0 to y7 to calculate the total number Y of edges.
Further, when the total number Y of edges is larger than a predetermined value, for example, as shown in Equation (1), it becomes 15 when the total number Y is larger than 32 so as to be constant. To generate a total number Z.
[0045]
[Expression 1]

[0046]
For example, the control circuit 14 calculates the evaluation value A based on the total number X and the total number Z as shown in Equation (2).
[0047]
[Expression 2]

[0048]
When the low level is 0 and the high level is 1 as shown in FIG. 6A, the control circuit 14 generates a total number b0 to b31 by summing up at the same timing for 8 seconds. Evaluate level changes. The total number b0 to b31 is also simply referred to as the total number b.
[0049]
In the case of the control circuit 14 shown in FIG. 6A, for example, the total numbers b0 to b31 are respectively 5, 6, 8, 8, 8, 8, 8, 8, 0, 0, 0, 0, Assume that 0,0,1,1,1,1,1,1,1,1,1,4,5,5,5,5,5,5,5,5.
[0050]
The control circuit 14 generates the low level “L (0)” stability SL based on the total number b.
For example, as illustrated in FIG. 6C, the control circuit 14 sets the stability SL to 0 when 5 or more of the total numbers b1 to b31 are continuous. In cases other than the above, when the number of 1 or less continues 5 or more, the stability SL is set to 1. In cases other than the above, when the number of 2 or less continues 5 or more, the stability SL is set to 2. If none of the above conditions is satisfied, the stability SL is set to 7.
[0051]
For example, as illustrated in FIG. 6C, the control circuit 14 generates the high-level “H (1)” stability SH based on the total number b. Specifically, for example, as illustrated in FIG. 6C, the control circuit 14 sets the stability SH to 0 when 8 or more of the total numbers b1 to b31 are continuous. In cases other than the above, when the number of 6 or less continues 5 or more, the stability SH is set to 1. In cases other than the above, when the number of 4 or less continues 5 or more, the stability SH is set to 2. If none of the above conditions is met, the stability SH is set to 7.
[0052]
The control circuit 14 generates an evaluation value B based on the stability SL and the stability SH. For example, the control circuit 14 adds the stability SL and the stability SH to generate an evaluation value B as shown in Equation (3).
[0053]
[Equation 3]
Evaluation value B = Stability SL + Stability SH (3)
[0054]
The evaluation value B is an index indicating the stability of the received signal. The smaller the evaluation value B is, the more stable the value is.
In the case of the control circuit 14 shown in FIG. 6A, the stability value SL is 0 and the stability value SH is 0, so the evaluation value B is 0.
[0055]
Based on the evaluation value A and the evaluation value B, the control circuit 14 generates an evaluation value C indicating the reception state of the received signal. For example, the control circuit 14 adds the evaluation value A and the evaluation value B to generate an evaluation value C as shown in Equation (4). The smaller the evaluation value C, the better the reception state.
[0056]
[Expression 4]
Evaluation value C = Evaluation value A + Evaluation value B (4)
[0057]
In the case shown in FIG. 6A, the control circuit 14 determines that the evaluation value A is 0 and the evaluation value C is 0 because the evaluation value A is 0 and the reception state is very good. To do.
[0058]
For example, when the evaluation value C is smaller than a predetermined value, for example, 2, the control circuit 14 determines that the reception state is extremely good, and receives the reception at the evaluated reception frequency by the long wave reception circuit 110. Set the frequency.
[0059]
When the evaluation value C is larger than the predetermined value, the control circuit 14 samples the standard radio waves having different frequencies, evaluates the reception state, and compares it with the evaluation value C indicating the reception state of the standard radio waves having different frequencies. A control signal CTL 113 that receives a standard radio wave having a smaller evaluation value C is output to set the reception frequency of the standard radio signal reception system 11.
The control circuit 14 counts various counters of the internal clock 1401 based on the basic clock by the oscillation circuit 13 when the time can be set based on the standard radio time signal received at the set reception frequency. Take control.
[0060]
When the reception state is not within the reference range, the control circuit 14 outputs the drive signal DR1 to the drive circuit 15 without outputting the control signal CTL1, and causes the light emitting element 16 as the notification means to emit light to the user. Notify that the standard radio wave signal is hardly received.
[0061]
Based on the received standard time information, the control circuit 14 compares the time information measured by the various time counters of the internal clock 1401 with the standard time information. Accordingly, the time counter is corrected, and in response to the correction, a pulse signal P for correction is input to the motor 131 as the control signal CTL2 to perform fast-forward driving or the like, and the time display is corrected by the hands.
[0062]
Next, specific configurations of the movement of the radio-controlled timepiece and the hand position detection system will be described with reference to FIGS. 2 and 3 and FIGS.
As shown in FIGS. 2 and 3, the timepiece main body 100 has a lower case 111, an upper case 112 that are connected to face each other to form an outline, and a lower space in a space formed by the lower case 111 and the upper case 112. An intermediate plate 113 is provided in a state of being connected to the case 111.
[0063]
The watch body 100 includes a lower case 111 as a second case and an upper case 112 as a first case that are connected to face each other to form an outline, and a space formed by the lower case 111 and the upper case 112. A middle plate 113 arranged in a state of being connected to the lower case 111 at a substantially central portion, and a first drive system with respect to predetermined positions of the lower case 111, the middle plate 113, and the upper case 112 in the space. A (second hand drive system) 120, a second drive system (hour / minute hand drive system) 130, a light detection sensor 140, a manual correction system 150, and the like are fixed or pivotally supported.
[0064]
As shown in FIG. 2, the first drive system 120 includes a substantially U-shaped stator 121a, a drive coil 121b wound around one leg piece of the stator 121a, and a rotation between the other magnetic pole of the stator 121a. First stepping motor 121 configured by a freely arranged rotor 121c and a first fifth transmission gear (first detection gear) in which a large-diameter gear 122a meshes with a pinion 121d of the rotor 121c. A wheel 122 and a second hand wheel 123 as a second detection gear (first pointer wheel) meshed with the small gear 122b of the first fifth wheel 122 are configured.
Here, in the second hand stepping motor 121, the stator 121a is mounted and fixed on the intermediate plate 113, and the rotor 121c is pivotally supported by the intermediate plate 113 and the upper case 112. The output control signal CTL1 of the control circuit 14 is provided. The rotation direction, rotation angle, and rotation speed are controlled based on the above.
[0065]
The first fifth wheel 122 has 60 teeth on the large gear 122a and 15 teeth on the small gear 122b, and is rotatably supported by the intermediate plate 113 and the upper case 112. The large-diameter gear 122a meshes with the rotor 121c (pinion 121d) of the second hand stepping motor 121 to reduce the rotational speed of the rotor 121c to a predetermined speed. As shown in FIG. 7, the first fifth wheel & pinion 122 has three circular transparent holes arranged at equal intervals in the circumferential direction (center angle α1 is 120 °) in a region overlapping with the second hand wheel 123. A hole 122c is formed. The through-hole 122c not only allows the detection light of the light detection sensor 140 to pass, but at least one of them is used as a positioning hole (determining hole) when assembling the first fifth wheel & pinion 122. is there.
[0066]
In the second hand wheel 123, the large-diameter gear 123a has 60 teeth, one end of the shaft portion is pivotally supported by the upper case 112, and the second hand passes through the middle plate 113 to the lower case 111 side. A shaft 123b is press-fitted, and this second hand shaft 123b is inserted inside a minute hand pipe 134p described later, and a second hand is attached to the tip thereof. As shown in FIG. 10, the second hand wheel 123 has eleven circular shapes arranged at equal intervals in the circumferential direction (center angle α2 is 30 °) in a region overlapping the first fifth wheel & pinion 122 by rotation. A through-hole 123c formed and a positioning light-shielding portion 123d having a different pitch at only one place (the central angle between the through-hole 123c and the through-hole 123c is 60 °) are formed. The second hand is configured to indicate the hour when the through hole 122c of the first fifth wheel & pinion 122 first faces the through hole 123c after facing the positioning light-shielding portion 123d.
[0067]
The through-hole 123c not only allows the detection light of the light detection sensor 140 to pass through, but at least one of them is used as a positioning hole (determining hole) when the second hand wheel 123 is assembled.
Further, inside these through-holes 123c, arc-shaped biasing springs 123e that are long in the circumferential direction and project in the direction of the rotation axis are defined by the cutout holes 123f. The arcuate urging spring 123e urges the second hand wheel 123 in the rotation axis direction.
[0068]
Here, the positioning light-shielding portion 123d is formed at a position away from the notch hole 123f in the circumferential direction, that is, at a region where the two notch holes 123f are separated from each other. Accordingly, a sufficient distance between the cutout hole 123f and the positioning light-shielding portion 123d can be secured, so that the detection light does not circulate into the cutout hole 123f in the region of the positioning light-shielding portion 123d, and the positioning light-shielding portion 123d reliably Detection light can be blocked. That is, since the positioning light-shielding portion 123d is formed at a position away from the region where the notch hole 123f is prone to erroneous detection due to detection light wraparound, the positioning light-shielding portion 123d is moved to the rotational angle position of the second hand wheel 122. By using this for positioning, reliable positioning can be performed.
[0069]
In the second hand wheel 123, as shown in FIG. 10, instead of providing a plurality (11) of through holes 123c, as shown in FIG. 11, a through hole 123c at a position facing the positioning light-shielding portion 123d in the radial direction. Other through-holes 123c may be formed integrally with the cut-out holes 123g, respectively. According to this, it is possible to further ensure the passage of the detection light in the portion where the detection light is allowed to pass, and to reduce the waste of the material forming the second hand wheel 123.
[0070]
As shown in FIGS. 2, 3, and 8, the second drive system 130 includes a substantially U-shaped stator 131a, a drive coil 131b wound around one leg piece of the stator 131a, and the stator 131a. The second fifth wheel & pinion 132 as an intermediate gear having a large-diameter gear 132a meshed with a pinion 131d of the rotor 131c and an hour / minute hand stepping motor 131 constituted by a rotor 131c rotatably arranged between the other magnetic poles of And a third transmission wheel 133 as a second transmission gear (third detection gear) in which the large-diameter gear 133a meshes with the small-diameter gear 132b of the second fifth wheel 132, and the small-diameter gear 133b of the third wheel 133. The large-diameter gear 135a meshes with the minute hand wheel 134 as the fourth detection gear (second pointer wheel) meshed with the large-diameter gear 134a and the small-diameter gear 134b of the minute hand wheel 134. It was a minute wheel 135 of the day as the intermediate gear is constituted by the hour wheel 136 of the fifth detection gear in mesh with the small diameter gear 135b of the minute wheel 135 of the day (second hand wheel).
Here, in the hour / minute hand stepping motor 131, the stator 131 a is mounted and fixed on the intermediate plate 113, and the rotor 131 c is pivotally supported by the intermediate plate 113 and the upper case 112. The rotation direction, rotation angle, and rotation speed are controlled based on the above.
[0071]
The second fifth wheel & pinion 132 is formed such that the number of teeth of the large diameter gear 132a is 60 and the number of teeth of the small diameter gear 132b is 15, and is pivotally supported by the intermediate plate 113 and the upper case 112, and the large diameter gear 132a. Meshes with the rotor 131c (pinion 131d) of the hour / minute hand stepping motor 131 to reduce the rotational speed of the rotor 131c to a predetermined speed. As the second fifth wheel & pinion 132, the above-mentioned first fifth wheel & pinion 122 may be used, that is, the one provided with the through hole 122c may be used. Thereby, parts can be shared and the cost of the product can be reduced.
[0072]
In the third wheel 133, the large-diameter gear 133a has 60 teeth and the small-diameter gear 133b has ten teeth. One end of the shaft portion is pivotally supported by the upper case 112, and the other end side is the middle plate 113. It is rotatably arranged in a penetrating state, and the rotation of the second fifth wheel & pinion 132 is decelerated and transmitted to the minute hand wheel 134. Further, as shown in FIG. 12, the third wheel & pinion 133 is arranged at equal intervals (center angle α3 is 36 °) in the circumferential direction in a region overlapping with the second hand wheel 123 and the first fifth wheel & pinion 122 by rotation. Ten circular through holes 133c are formed. The through-hole 133c not only allows the detection light of the light detection sensor 140 to pass through, but at least one of them is used as a positioning hole (determining hole) when the third wheel 133 is assembled.
[0073]
In the minute hand wheel 134, the large-diameter gear 134a has 60 teeth and the small-diameter gear 134b has 14 teeth, and the minute hand pipe 134p, in which the small-diameter gear 134b is integrally formed, is formed at the side surface. It is formed so as to have a substantially T-shape when viewed. One end portion of the minute hand pipe 134p is pivotally supported by the intermediate plate 113, and the other end side shaft portion is rotatably inserted into an hour hand pipe 136p of an hour hand wheel 136 described later. Further, the minute hand pipe 134p penetrates the lower case 111 and protrudes toward the dial face of the timepiece, and a minute hand is attached to the tip thereof.
[0074]
Further, as shown in FIG. 13, the minute hand wheel 134 has three arc-shaped through holes that are long in the circumferential direction in the region overlapping with the second hand wheel 123, the first fifth wheel 122, and the third wheel 133 by rotation. 134c, 134d, and 134e are formed. The arc-shaped through-hole 134c and the arc-shaped through-hole 134d are formed with a center angle α5 separated by 30 °, and the arc-shaped through-hole 134d and the arc-shaped through-hole 134e are formed with a center angle α6 separated by 30 °. Further, the arc-shaped through hole 134e and the arc-shaped through hole 134c are formed at a central angle α7 and separated by 60 °. That is, the light-shielding portion A having the widest width is formed between the arc-shaped through hole 134e and the arc-shaped through hole 134c, and between the arc-shaped through hole 134c and the arc-shaped through hole 134d and between the arc-shaped through hole 134d and A light shielding part B narrower than the light shielding part A is formed between the arcuate through hole 134e.
[0075]
The arc-shaped through-hole 134c is formed by a circular portion 134c1 on one end side, a wide arc portion 134c2 extending from the other end side, and a narrow arc portion 134c3 connecting the two. The circular portion 134c1 defined by the narrow circular arc portion 134c3 is used not only for passing the detection light but also as a positioning hole (determining hole) when the minute hand wheel 134 is assembled.
[0076]
The hour hand wheel 136 has a large gear 136a having 40 teeth, and a cylindrical hour hand pipe 136p is integrally attached to the center of the hour hand wheel 136a. The minute hand pipe 134p is disposed inside the hour hand pipe 136p. It is inserted. The hour hand pipe 136p is inserted into a bearing hole 111a formed in the lower case 111 and pivotally supported. The tip of the hour hand pipe 136p penetrates the lower case 111 to the dial face of the watch. It protrudes and has an hour hand attached to its tip.
[0077]
Further, as shown in FIG. 14, the hour hand wheel 136 includes three pieces that are long in the circumferential direction in a region overlapping with the second hand wheel 123, the first fifth wheel 122, the third wheel 133, and the minute hand wheel 134 by rotation. Arc-shaped through holes 136c, 136d, and 136e are formed. The arc-shaped through-hole 136c and the arc-shaped through-hole 136d are formed with a central angle α8 of 45 ° apart, and the arc-shaped through-hole 136d and the arc-shaped through-hole 136e are formed with a central angle α9 of 60 ° apart. Further, the arc-shaped through hole 136e and the arc-shaped through hole 136c are formed at a central angle α10 and separated by 30 °, and the arc-shaped through holes 136c, 136d, and 136e have a length of the central angle β1 + β2, β3 and β4 are set to be 75 °, 60 °, and 90 °, respectively. That is, the narrowest light-shielding portion C is formed between the arc-shaped through-hole 136e and the arc-shaped through-hole 136c, and the light-shielding portion C is located between the arc-shaped through-hole 136c and the arc-shaped through-hole 136d. A wide light-shielding portion D is formed, and a light-shielding portion E wider than the light-shielding portion D is formed between the arc-shaped through hole 136d and the arc-shaped through-hole 136e.
[0078]
In addition, the arc-shaped through hole 136c connects the circular portion 136c1 located at a center angle β1 of 7.5 ° from one end side and the wide arc portion 136c2 extending from the other end side, and connects the both. It is formed by a narrow arc portion 136c3 located on both sides. The circular portion 136c1 defined by the narrow arc portion 136c3 is used not only for passing detection light but also as a positioning hole (determining hole) when the hour hand wheel 136 is assembled.
[0079]
The minute wheel 135 has 42 teeth for the large-diameter gear 135a and 10 teeth for the small-diameter gear 135b, and is pivotally supported with respect to the protrusion 111b formed on the lower case 111. The large-diameter gear 135a meshes with the small-diameter gear 134b formed on the minute hand pipe 134p, and the small-diameter gear 135b meshes with the hour hand wheel 136 (136a) to decelerate the rotation of the minute hand wheel 134 and to set the hour hand It is transmitted to the car 136.
[0080]
As shown in FIG. 2, the light detection sensor 140 includes a light emitting element 142 made of a light emitting diode attached to a circuit board 141 fixed to the wall surface of the upper case 112, and a lower case so as to face the light emitting element 142. And a light receiving element 144 made of a phototransistor attached to a circuit board 143 fixed to the wall surface of 111.
The anode of the light emitting element 142 is connected to the other end of the resistance element R4 in the drive circuit 18 having one end connected to the collector of the pnp transistor Q2, and the cathode is grounded and connected to the emitter of the light receiving element 144. Yes.
The collector of the light receiving element 144 is connected to the control circuit 14. The connection line to this control circuit is an output line for the detection signal DT1 to the control circuit 14, and this output line is connected to the power supply voltage V via the resistance element R5. _cc Connected to the supply line.
The emitter of the transistor Q2 of the drive circuit 18 is the power supply voltage V _cc The base is connected to the output line of the drive signal DR2 via the resistance element R3.
That is, the light emitting element 142 is connected to the drive circuit 18 so as to emit light when the low level drive signal DR2 is output from the control circuit 14.
[0081]
As shown in FIG. 3, the first fifth wheel 122, second hand wheel 123, third wheel 133, minute hand wheel 134, and hour hand wheel 136 are all disposed at the same time in plan view. And the through-hole 122c of the 1st fifth wheel 122, the through-hole 133c of the third wheel 133, the through-hole 123c of the second hand wheel 123, the through-hole 134c (134d, 134e) of the minute hand wheel 134, and the through-hole of the hour hand wheel 136 When 136c (136d, 136e) overlaps, the detection light emitted from the light emitting element 142 is received by the light receiving element 144, and it is output that the second hand, the minute hand, and the hour hand indicate the position such as the hour. It has become.
[0082]
Further, the light emitting element 142 is disposed in an attachment recess 112c as a first arrangement portion formed so as to open to the outside of the upper case 112, and a circular through hole having a predetermined diameter is formed on the bottom surface of the attachment recess 112c. A hole 112d is formed. The circular through-hole 112d has a property that the detection light emitted from the light emitting element 142 spreads in a divergent shape, and therefore, it is possible to prevent erroneous detection by blocking only the light that has converged by blocking the light of the spread. It is to make.
Similarly, the light receiving element 144 is disposed in an attachment recess 111c as a second arrangement portion formed so as to open to the outside of the lower case 111, and a circular shape having a predetermined diameter is formed on the bottom surface of the attachment recess 111c. A through hole 111d is opened. The circular through-hole 111d emits from the light-emitting element 142 and allows only light that has passed through the through-hole to pass as much as possible to prevent erroneous detection.
[0083]
When attaching the first fifth wheel 122, the third wheel 133, the second hand wheel 123, the minute hand wheel 134, and the hour hand wheel 136, a predetermined positioning pin is used as the circular through hole 111d of the lower case 111, and the positioning. The assembly is sequentially performed so as to penetrate the through hole and the circular through hole 112d of the upper case 112. After the upper case 112 and the lower case 111 are joined and integrated, the positioning pin is pulled out, the light emitting element 142 is attached to the attachment recess 112c where the through hole 112d is located, and the attachment recess where the through hole 111d is located The light receiving element 144 is attached to 112c.
[0084]
As a result, the through holes 112d and 111d are completely closed, and external light can be prevented from entering the internal space defined by the upper case 112 and the lower case 111. Therefore, it is possible to prevent erroneous detection due to the intrusion of external light, and since both the positioning hole at the time of assembly and the light detection through hole are combined, these holes are provided in comparison with the case where they are provided separately. The apparatus can be integrated and downsized.
[0085]
As shown in FIGS. 2 and 3, the manual correction system 150 includes a date wheel 135 that meshes with the small-diameter gear 134 b of the minute hand wheel 134 and the large-diameter gear 136 a of the hour hand wheel 136, and the reverse wheel 135 of this day. And a manual correction shaft 151 having a gear 151a meshing with the large-diameter gear 135a. The manual correction shaft 151 is positioned outside the upper case 112 and penetrates a head 151b that can be directly touched by a user and an opening 112e that extends from the head 151b and is formed in the upper case 112. It consists of a columnar portion 151c that is pivotally supported with respect to a protrusion 111e formed on the lower case 111, and a gear 151a is formed in a lower region of the columnar portion 151c.
[0086]
The manual correction shaft 151 is configured to rotate in the same phase as the minute hand wheel 134, and when the minute hand wheel 134 is driven by the above-described second drive system 130, the minute hand wheel 134 via the minute wheel 135. When the second drive system 130 is not operated, the pointer position can be manually corrected by rotating the head 151b with a finger.
[0087]
As described above, the second hand shaft 123b of the second hand wheel 123 is inserted into the minute hand pipe 134p of the minute hand wheel 134, and the minute hand pipe 134p of the minute hand wheel 134 is inserted into the hour hand pipe 136p of the hour hand wheel 136. The minute hand wheel 134 and the hour hand wheel 136 have the same rotation center axis, and when the time is displayed, the second hand is rotated once every 60 seconds, the minute hand is rotated once every 60 minutes, and the hour hand is rotated. Driven to rotate once every 12 hours.
[0088]
As shown in FIG. 15, a groove as a first index for positioning that extends in a radial direction at a distal end portion of the minute hand pipe 134p of the minute hand wheel 134 and a distal end portion of the hour hand pipe 136p of the hour hand wheel 136 as shown in FIG. 134 g and a groove 136 g as a second index are formed. The groove 134g and the groove 136g are set so as to indicate a predetermined time, for example, 12:00 when aligned.
[0089]
By providing such a positioning index, even if the minute hand wheel 134 and the hour hand wheel 136 are surrounded by the lower case 111 and the upper case 112 and covered, the grooves 134g and 136g can be preliminarily aligned. Since it can be seen that it indicates the approximate time that has been set, the minute hand and hour hand can be easily attached based on that state, eliminating the need for other alignment and position confirmation processes. Manufacturing time and inspection time can be shortened. Note that the positioning index is not limited to the above groove, but may be a mark such as a potch.
[0090]
FIG. 16 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG. The operation of the radio-controlled timepiece 1 will be described focusing on the operation of evaluating the reception frequency of the control circuit 14 with reference to FIG.
[0091]
In step ST1, for example, as an initial setting, the control circuit 14 outputs a control signal CTL113 for receiving a standard radio wave with a frequency of 40 kHz to the switching unit 113 to activate the 40 kHz receiving circuit 111 and receive the signal S111.
[0092]
In step ST2, the control circuit 14 determines whether or not 3 minutes or more have elapsed since the start of reception, including frequency selection and second synchronization. If it is determined that 3 minutes or more have elapsed, the control circuit 14 determines the reception frequency. (ST3), the temporary reception frequency is set to 40 kHz (ST4), and the process related to selection of the reception frequency is terminated.
[0093]
On the other hand, in step ST2, the control circuit 14 waits for stabilization of the output from the long wave receiving circuit 110. Specifically, when 5 seconds have elapsed from the start of reception (ST5), the standard radio wave is received for 8 seconds and sampled. (ST6).
In step ST7, the control circuit 14 measures the edge ed (both edges) every second, measures the seconds without the edge ed (ST8), and, as shown in FIG. Is generated (ST9).
[0094]
In step ST10, the control circuit 14 measures the level at each sampling timing, evaluates the “L” level stability SL as shown in FIG. 6 (ST11), and performs the “H” level stability SH. (ST12), and an evaluation value B is calculated from the determination result (ST13).
In step ST14, the control circuit 14 stores the previous evaluation value A in the memory 1402, and calculates the latest evaluation value C (ST15).
[0095]
In step ST16, the control circuit 14 determines whether or not it is the first reception. When it is determined that it is the first reception, it is determined whether or not the evaluation value is 2 or less (ST17), the current frequency is set as a reception frequency (ST18), and the process proceeds to the second synchronization process (ST19). ).
[0096]
On the other hand, if it is determined in step ST17 that the evaluation value C is 2 or more, that is, greater than 2, the reception frequency of the standard radio wave is switched. For example, the control signal CTL 113 for switching the reception frequency from 40 kHz to 60 kHz is output to the standard radio wave signal reception system 11 to switch the reception frequency (ST20), and the processing returns to step ST2, and similar processing is performed at the switched frequency.
[0097]
On the other hand, if it is determined in step ST16 that it is not the first reception, the current evaluation value C and the previous evaluation value C are compared (ST21). It is determined whether or not the evaluation value C is greater than the previous evaluation value C (ST22). If it is determined that the current evaluation value C is large, the process proceeds to step ST18.
[0098]
On the other hand, if it is determined in step ST22 that the current evaluation value C is smaller than the previous evaluation value C, the previous frequency is determined (ST23), and the process proceeds to the second synchronization process in step ST19. .
On the other hand, if the current evaluation value C matches the previous evaluation value C in the determination of step ST21, it is determined whether or not the evaluation value is 15 (ST24), and the evaluation value is determined to be 15. If it is determined that the reception state is not good, the process proceeds to step ST20.
[0099]
On the other hand, if it is determined in step ST24 that the evaluation value is not 15, it is determined that the reception state is not good, and the process proceeds to step ST18.
[0100]
When the reception frequency is confirmed, the control circuit 14 sets a confirmation flag. If the reception frequency cannot be normally received for 24 hours after the reception frequency is confirmed, the control circuit 14 clears the confirmation flag and performs the above-described selection process of the reception frequency again.
[0101]
For example, as shown in FIG. 6A, the control circuit 14 detects a pattern that becomes, for example, 111111,000,000 based on the standard radio signal of the determined reception frequency, and the falling edge ed1 from 1 to 0 is detected. The time is synchronized with the internal clock 1401 as the zero point of the standard radio signal.
Thereafter, the control circuit 14 performs minute synchronization processing, time code analysis processing, etc., outputs control signals CTL1 and CTL2 to the stepping motors 121 and 131 according to the standard time, performs fast-forward operation, and sets the pointer to the standard time. To do.
[0102]
FIG. 17 is a flowchart showing the operation of the hand position detection process of the radio-controlled timepiece shown in FIG. The pointer position detection process will be described with reference to FIG.
An hour / minute pulse signal output pattern is set from the control circuit 14 (ST101), and the drive signal DR2 is output to the drive circuit 18 at a low level. Accordingly, the transistor Q2 is turned on, and detection light is emitted from the light emitting element 142, that is, the light emitting diode.
[0103]
Subsequently, the control signal CTL1 is output from the control circuit 14, the second hand stepping motor 121 is pulse-driven (ST102), the light receiving element 144, that is, the phototransistor is turned on, and the detection signal DT1 is at a high level (power supply voltage V _cc It is determined whether or not the level has been switched to the low level (ST103).
[0104]
Here, when the detection signal DT1 from the phototransistor is held at a high level, the detection signal DT1 from the phototransistor is at a high level (power supply every time the number of pulses is added to perform step driving. Voltage V _cc It is determined whether or not the level has been switched from low to low (ST104 to ST106).
Even when the number of pulses reaches 9, the detection signal DT1 output from the phototransistor remains at the high level (power supply voltage V _cc If the level does not change to the low level, the hour / minute hand stepping motor 131 is driven by one step (pulse) (ST107), and then the second hand stepping motor 121 is stepped again (ST102) and the second hand wheel 123 is moved. Driven by rotation.
[0105]
On the other hand, when it is determined in step ST103 that the detection signal DT1 from the phototransistor has switched from the high level to the low level, the second hand wheel 123 is fast-forwarded (ST108), and the comparison with the output pattern stored in advance in the control circuit 14 is performed. Performed (ST109).
As a result of the comparison, if the obtained output pattern does not match the stored output pattern, the process returns to step ST108, and the second hand wheel 123 is fast-forwarded again.
[0106]
On the other hand, if the obtained output pattern matches the stored output pattern, the output of the phototransistor is then output at that time (when the level of the detection signal DT1 is not switched to the low level by the phototransistor even at the fifth step). At the time of switching to low level), the output of the control signal CTL1 is stopped, and the circuit driving of the second hand wheel 123 is stopped. Then, the second hand wheel 123 stops at the zero return position (ST110). At this time, the second hand is corrected to a position at a predetermined time, for example, the hour (0 second), and the second hand origin searching process ends.
[0107]
Subsequently, the control signal CTL2 is output from the control circuit 14, only the hour / minute hand stepping motor 131 is pulse-driven at a predetermined output frequency, and the minute hand wheel 134 is fast-forwarded (ST111).
[0108]
Then, the output pattern from the phototransistor is compared with the output pattern stored in advance in the control circuit 14 (ST112).
As a result of the comparison, if the obtained output pattern does not match the stored output pattern, the process returns to step ST111, and the minute hand wheel 134 is fast-forwarded again.
[0109]
On the other hand, if the obtained output pattern matches the stored output pattern as a result of the comparison in step ST112, the output of the control signal CTL2 is stopped at that time, and the hour / minute hand stepping motor 131 is stopped. Thus, the driving of the minute hand wheel 134 and the hour hand wheel 136 is stopped (ST113).
[0110]
Here, the position detection processing of the hour / minute hand wheel by comparing the output pattern with the output pattern stored in advance is performed by matching with any of the three types of patterns.
[0111]
FIG. 18 is a diagram for explaining an output pattern of detection light of the radio-controlled timepiece shown in FIG.
That is, as shown in FIG. 18A, the output pattern of the phototransistor by the minute hand wheel 134 has two narrow B portions and one wide A portion alternately as the off width where the light shielding portion acts. As shown in FIG. 18B, the output pattern of the phototransistor by the hour hand wheel 136 has three types of D-parts, E-parts, and C-parts in which the light-shielding part acts as shown in FIG. Is a pattern that appears alternately at a predetermined interval, and an output pattern obtained by combining the two is a pattern in which the D part, the B part, and the A part are combined, as shown in FIG. Three types of patterns, which are a combination of the B part and the A part and a pattern of the C part, the B part, and the A part, appear at predetermined intervals.
In the pattern shown in FIG. 18, the portion of the pattern that is turned on is actually a toothless pattern because there is a portion that is turned off by the light blocking portion of the third wheel & pinion 133.
[0112]
Further, for example, as the reference positions of the minute hand wheel 134 and the hour hand wheel 136, as shown in FIG. 18, the positions are set to 0:00, 4:00, and 8:00.
[0113]
When a pattern consisting of a combination of D part, B part and A part is confirmed, for example, 4:00, for example, when a pattern consisting of a combination of E part, B part and A part is confirmed, for example, 8:00, If a pattern consisting of a combination of part C, part B and part A is confirmed, for example, it is set in advance as 12:00, for example, when one of these patterns is detected, an hour / minute hand stepping motor By stopping 131, the minute hand wheel 134 and hour hand wheel 136, that is, the minute hand and hour hand can be adjusted to a predetermined time.
[0114]
Then, after the hour / minute hand stepping motor 131 is stopped, the drive signal DR2 by the control circuit 14 is switched to a high level.
Thereby, the transistor Q2 of the drive circuit 18 is turned off, the light emission of the light emitting diode is stopped (ST114), and the time adjustment operation is ended.
[0115]
Further, the case where the shipping position TS is set such that the origin search process of the hour / minute hands wheel is shortened in the sword attachment mode, that is, 10:30 in this embodiment, will be described with reference to FIG.
For example, when the user inserts an external battery, the control circuit 14 performs a phase alignment process, a second hand origin search process, a minute hand origin search process, and a time adjustment process. When the shipping position TS is set to 10:30, as shown in FIG. 18, the second hand and the hour / minute hand wheel are driven from the shipping position TS to penetrate the detection light, and then the hour / minute hand is stopped and the second hand is stopped. Perform origin search. Thereafter, the hour / minute hands wheel is rotated, and the light sensor portion 140 detects the C portion, thereby detecting that the position is approximately 12 o'clock, and stopping when the B portion and the A portion are detected. Is set to a predetermined reference position 12:00.
[0116]
For example, the 10:30 position is a position where a necessary and necessary on / off pattern to be referred to is detected when the origin search process is performed when the hour / minute hand wheel is set to the reference position. By setting a shipping guideline at this position, the origin search time is the shortest.
[0117]
FIG. 19 is a flowchart showing the operation of the radio-controlled timepiece shown in FIG.
Aging and function tests are performed with a 40 kHz transmitter installed in the factory, and the exact time is transmitted with a 60 kHz transmitter. In this order, the frequency selection at the time of normal reception is performed from 40 kHz, and in the sword mode, the frequency selection is performed from 60 kHz to reduce the time required for frequency selection.
[0118]
The operation in the sword attachment mode will be described.
In step ST201, the control circuit 14 outputs an initialization pulse to the motor, initializes the hand movement direction, and prohibits normal hand movement (ST202).
In step ST203, the control circuit 14 supplies power to the standard radio wave signal receiving system 11, and starts receiving standard radio waves.
In step ST204, the control circuit 14 outputs drive signals CTL1 and CTL2, and starts searching for the origins of the second hand wheel and the hour / minute hand wheel based on the light pattern detected by the optical sensor 140.
[0119]
In step ST205, when the origin search of the second hand wheel and the hour / minute hand wheel is completed, the control circuit 14 drives the drive signals CTL1 and CT2 to start the movement of the pointer to the drive position at 0 hour 0 minute 0 second ( ST206).
In step ST207, if the control circuit 14 determines that the movement of the pointer has been completed at 0: 0: 0, it determines whether or not the time adjustment switch is on (ST208).
[0120]
In step ST208, when it is determined that the time correction clock is not in the on state, the control circuit 14 clears the pushing time (ST209) and determines whether it is less than 2 seconds (before clearing) (ST210). If it is determined that it is not less than 2 seconds, the process returns to step ST208.
On the other hand, if it is determined in step ST210 that it is less than 2 seconds, the search is started to the next origin (ST211), and when the search is completed, the process returns to step ST208.
[0121]
On the other hand, if it is determined in step ST208 that the time adjustment switch is in the on state, a switching edge from the on state to the off state of the time adjustment switch is detected (ST213), and the time for pressing the time adjustment switch is measured (ST213). (ST214), the process returns to step ST208.
[0122]
On the other hand, when the switching edge from the OFF state to the ON state of the time correction switch is not detected in the determination in step ST213, it is determined whether or not 2 seconds or more have passed (ST215), and 2 seconds or more have not passed. Is determined, the process returns to step ST208.
[0123]
On the other hand, if it is determined in step ST215 that two seconds or more have elapsed, it is determined whether or not reception is completed (ST216). If reception is not completed, the process returns to step ST208.
[0124]
On the other hand, if it is determined in step ST216 that the reception is completed, the process proceeds to the shipping needle position movement process.
The shipping needle position movement process will be described.
In step ST217, when the reception frequency is set to 40 kHz as an initial setting, the control circuit 14 outputs the drive signal CTL1 to the second hand motor to move the second hand to the position of 20 seconds (ST218), and the process of step ST220. Proceed to When the reception frequency is set to 60 kHz as an initial setting, the drive signal CTL1 is output to the second hand motor, the second hand is moved to 30 seconds (ST219), and the process proceeds to step ST220.
[0125]
In step ST220, the control circuit 14 outputs the drive signal CTL2 and moves the hour / minute hands to 10:30.
This 10:30 position is a position where the origin search time is short when the user applies a battery after shipment, for example. Since the origin search process is performed based on the light pattern detected by the light detection sensor unit 140, the hour / minute hands are set at a position where a predetermined pattern necessary for performing the origin search is obtained.
[0126]
In step ST221, the control circuit 14 determines whether or not the time adjustment switch is in the on state. If it is determined that the time adjustment switch is not in the on state, and the movement of the hour / minute hand is completed (ST222), a series of swording mode processes are performed. To enter standby mode.
[0127]
On the other hand, if it is determined in step ST221 that the time adjustment switch is not in the on state, it is further determined whether or not 2 seconds (4 seconds in total) have passed (ST223). Then, the process returns to step ST221.
[0128]
On the other hand, if it is determined in step ST222 that two seconds have elapsed, the control circuit 14 outputs the drive signals CTL1 and CTL2 based on the time counted by the internal clock 1401, Start moving the second hand to the current time. At this time, the control circuit 14 permits the second-hand movement (ST225).
[0129]
In step ST226, when the time correction switch is in the on state and the switching edge from the off state to the on state of the switch is detected (ST227), the control circuit 14 prohibits the 2-second hand movement (ST228), and step ST217. Proceed to the process.
On the other hand, if it is determined in step ST226 that the time adjustment switch is not turned on, and if no edge is detected in step ST227, the process returns to step ST226.
[0130]
As described above, since the time is corrected and the pointer is stopped at a predetermined position in the sword mounting mode, it can be confirmed that the time is corrected at the time of shipment from the stopped hand position. Also, the time required for origin search can be minimized.
[0131]
FIG. 20 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG. The operation of the radio-controlled timepiece 1, for example, the operation when an external battery is applied will be described with reference to FIG.
[0132]
In step ST301, the time information measured by the internal clock 1401 is held by the internal battery 202.
The time information of the internal clock 1401 is set in advance, for example, before the radio-controlled clock 1 is shipped. Further, the position of the pointer is set to a position where the search time of the origin search process is short.
[0133]
In step ST302, the control circuit 14 determines whether or not an external battery is detected. Specifically, when the control circuit 14 outputs a signal S22 indicating that an external power supply is applied from the power supply unit 200, the control circuit 14 outputs a control signal S22 that causes the internal battery 202 to be unconnected to the power supply unit 200. The internal battery 202 is caused to be disconnected from the unit 200 (ST303).
[0134]
In step ST304, the control circuit 14 outputs the drive signals CTL1 and CTL2 to drive the second hand drive system 120 and the hour / minute hand drive system 130, and based on the light pattern by the light shielding part and the light transmitting part provided in each. As described above, the reference wheel origin search process is performed.
[0135]
In step ST305, the control circuit 14 outputs the drive signals CTL1 and CTL2 based on the time information of the internal clock 1401 held by the internal battery 202, and displays the time using the hands.
[0136]
In step ST306, the control circuit 14 causes the standard radio wave receiving system 11 to receive the standard radio wave signal (ST306), corrects the time information measured by the internal clock 1401 based on the received standard radio wave signal, and Based on the result, drive signals CTL1 and CTL2 are driven to correct the time display by the hands (ST307).
[0137]
As described above, the power supply unit 200 that detects the insertion of the external battery 201, the internal clock 1401 that keeps the time measured by the internal battery 202, the plurality of reference positions, and includes the light transmitting unit and the light blocking unit. Based on the second hand drive system 120 and the hour / minute hand drive system 130 for driving the second hand wheel, the minute hand wheel, and the hour hand wheel, and the light transmitting portion and the light shielding portion of the pointer wheel, the detection according to the reference position and the pointer position of the pointer wheel When the optical sensor unit 140 for detecting the signal and the power source unit 200 detect the insertion of the external battery 201, the second hand drive system 120 and the hour / minute hand 130 are driven, and the phase is determined based on the detection signal of the optical sensor unit 140. After the second hand origin search and hour / minute hand origin search, the pointer position of the pointer wheel is set based on the time measured by the internal clock 1401 and the time is displayed by the pointer. The input before, since there is provided a control circuit 140 for setting the pointer position of the hand wheel between the plurality of reference positions, the initial time, it is possible to perform an accurate time display in a short time.
[0138]
Further, it can be confirmed that the time has been set at the time of shipment by the position of the pointer, and when the external battery 201 is inserted, the time required for the origin search can be minimized.
[0139]
Note that the present invention is not limited to the present embodiment, and various suitable modifications can be made.
In the present embodiment, the pointer position is set at 10:30 in the sword attachment mode, but the present invention is not limited to this form.
For example, in the present embodiment, the light on / off pattern generated by the rotation of the light transmitting portion and the light shielding portion formed on the pointer wheel is detected, but the light transmitting portion and the light shielding provided on the pointer wheel are detected. The home position is detected in a shorter time by setting the heads at different installation positions and stopping the pointer at a position where the minimum on / off pattern necessary for origin search can be detected. The time according to the time can be set in a shorter time.
[0140]
In the present embodiment, the position of the pointer at the time of shipment is set at 10:30, but the present invention is not limited to this form. For example, if the pointer position at the time of shipment is between 8:00 and 10:30, the reference position of 0:00 is detected by detecting the C part, the B part, and the A part when the external power is turned on. Can be detected in a short time. At this time, it is preferable to set the pointer position at the time of shipment to the minimum position at which, for example, the C part, the B part, and the A part can be detected.
[0141]
In this embodiment, the reference position is set to 0:00, but the present invention is not limited to this form. For example, it may be 4:00 or 8:00. For example, in the case of setting at 4:00, the D part, the B part, and the A part can be detected in a short time by setting the pointer position at the time of shipment around 2:10. Further, in the case of setting to 8:00, by setting the pointer position at the time of shipment around 5:40, the E part, the B part, and the A part can be detected in a short time.
[0142]
【The invention's effect】
According to the present invention, it is an object of the present invention to provide a radio-controlled timepiece capable of performing accurate time display in a short time at the initial stage.
[Brief description of the drawings]
FIG. 1 is an electrical functional block diagram of an embodiment of a radio-controlled timepiece according to the present invention.
FIG. 2 is a configuration diagram of the radio-controlled timepiece shown in FIG.
FIG. 3 is an enlarged view of a cross section of the radio wave correction watch shown in FIG. 2;
FIG. 4 is a diagram for explaining a radio wave reception state in the control circuit according to the present invention.
FIG. 5 shows an example of a time code of a standard time radio signal. (A) shows formats other than 15 and 45 minutes per hour, and (b) shows formats for 15 minutes and 45 minutes per hour.
6 is a diagram for explaining an evaluation value generation process according to the reception state of the radio-controlled timepiece shown in FIG. 1; FIG.
FIG. 7 is a plan view showing a first drive system that drives a second hand that is a part of the radio-controlled timepiece.
FIG. 8 is a plan view showing a second drive system that drives the minute hand and hour hand that are part of the radio-controlled timepiece.
FIG. 9 is a plan view showing a first fifth wheel and a part of a first drive system that drives a second hand.
FIG. 10 is a plan view showing a second hand wheel that forms part of a first drive system that drives the second hand.
FIG. 11 is a plan view showing another example of a second hand wheel that forms part of the first drive system that drives the second hand.
FIG. 12 is a plan view showing a third wheel which forms part of the second drive system for driving the minute hand and the hour hand.
FIG. 13 is a plan view showing a minute hand wheel that forms part of a second drive system that drives the minute hand and the hour hand.
FIG. 14 is a plan view showing an hour hand wheel forming a part of a second drive system for driving the minute hand and the hour hand.
FIG. 15 is an end view showing a tip portion of a minute hand pipe and an hour hand pipe.
16 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG.
FIG. 17 is a diagram illustrating a detection output pattern obtained by combining a minute hand wheel, an hour hand wheel, and both in a correction operation;
18 is a diagram for explaining an output pattern of detection light of the radio-controlled timepiece shown in FIG. 1. FIG.
FIG. 19 is a flowchart showing the operation of the radio-controlled timepiece shown in FIG.
20 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Radio wave correction clock, 11 ... Standard radio wave reception system, 11a ... Reception antenna, 110 ... Long wave reception circuit, 111 ... 40kHz reception circuit, 112 ... 60kHz reception circuit, 12 ... Switch, 13 ... Oscillation circuit, 14 ... Control circuit, DESCRIPTION OF SYMBOLS 15 ... Drive circuit, 16 ... Light emitting element, 17 ... Buffer circuit, 100 ... Clock body, 111 ... Lower case, 112 ... Upper case, 113 ... Middle plate, 120 ... First drive system (second hand drive system), 121 ... Second hand Stepping motor (first drive source), 122 ... first fifth wheel (first transmission gear, first detection gear), 122 c ... through hole, 123 ... second hand wheel (second detection gear, first pointer) Car), 123c ... through hole, 123d ... positioning light shielding part, 123e ... biasing spring, 123f ... notch hole, 123g ... notch hole, 130 ... second drive system (hour / minute hand drive system), 131 ... hour / minute hand Stepping motor (second drive source), 132, second wheel No. 5, 133c, through hole, 134, minute hand wheel (fourth detection gear, second pointer wheel), 134c, arc-shaped through hole, 134d, circle Arc-shaped through hole, 134e... Arc-shaped through-hole, 134g... Groove (first index), 134p. ... Arc-shaped through hole, 136 d... Arc-shaped through hole, 136 e... Arc-shaped through hole, 136 g. 144: light receiving element, 150: manual correction system, 151: manual correction shaft, 151b: head, 200: power supply unit, 201: external battery, 202: internal battery, 1401: internal clock, 1402: memory.

Claims (6)

A radio-controlled clock that maintains the timekeeping time of the internal clock and corrects the time according to the standard time radio signal,
An external power source detection means for detecting external power on,
A pointer driving system for driving a pointer wheel provided with a plurality of reference positions;
Reference position detection means for detecting the reference position of the pointer wheel;
When the external power supply detecting means detects the turning on of the external power supply, after driving the pointer driving system and setting the pointer wheel to the reference position based on the detection process of the reference position detecting means, Control means for setting a pointer position of the pointer wheel based on a time measured by the internal clock, and setting the pointer position of the pointer wheel between the plurality of reference positions before turning on the external power supply; Has a radio correction watch. The pointer driving system drives the pointer wheel provided with a light transmission portion,
The reference position detection means includes an optical sensor unit that detects a detection signal based on the light transmission unit of the pointer wheel,
The control means drives the pointer drive system when the external power supply detection means detects that the external power supply is turned on, and moves the pointer wheel based on a detection signal detected by the optical sensor unit. After setting the reference position, the pointer position of the pointer wheel is set based on the time measured by the internal clock, and the pointer position of the pointer wheel is set between the plurality of reference positions before turning on the external power supply. The radio-controlled timepiece according to claim 1, which is set to The control means detects the pointer position of the pointer wheel between the plurality of reference positions and drives the pointer driving system before the external power is turned on and is detected by the optical sensor unit. The radio-controlled timepiece according to claim 2, wherein the signal is set at a position where at least a reference pattern indicating the reference position is included in the signal. The pointer wheel is provided with at least first, second and third reference positions at substantially equal intervals,
The control means drives the pointer drive system in a predetermined direction when the external power supply detection means detects that the external power supply is turned on, and the pointer based on a detection signal detected by the optical sensor unit. After setting the vehicle to the first reference position, the pointer position of the pointer wheel is set based on the time measured by the internal clock, and before turning on the external power, the pointer position of the pointer wheel is set to The radio-controlled timepiece according to claim 1, wherein the radio-controlled timepiece is set between the first reference position and the second reference position in a direction opposite to the predetermined direction. The control means sets the hand position of the hand wheel based on the time of the internal clock, then corrects the time of the internal clock based on the standard radio signal, and drives the hand drive system. The radio-controlled timepiece according to claim 1, wherein a pointer position of the pointer wheel is set. Setting signal output means for outputting a setting signal for setting at least a time measurement time of the internal clock and setting the pointer at a time setting display position indicating that the time measurement time of the internal clock is set;
When the setting signal output means outputs the setting signal, the control means sets the time of the internal clock and drives the pointer driving system to set the pointer at the time setting display position. The radio-controlled timepiece according to claim 1.

Images