JP2004226130A - Hand position detection device and radio controlled timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hand position detection device capable of detecting accurately the hand position at a phase adjustment time of a hand wheel, and a radio controlled timepiece. <P>SOLUTION: This device is provided with a second hand driving system 120 for rotating a second hand wheel 123 provided with a second hand and a translucent hole 123c, an hour-minute hand driving system 130 for rotating a minute hand wheel 134 and an hour hand wheel 136 provide with a minute hand, an hour hand and a translucent hole, an optical sensor part 140 containing an optical sensor 144 for acquiring a detection signal when the translucent hole in the second hand driving system 120 is approximately faced straightly to the translucent hole in the hour-minute hand driving system 130 and a light emitting element 142, and a control circuit 14 for performing hand position detection processing based on the detection signal detected by the optical sensor part 140 after allowing the optical sensor part 140 to set at a first detection sensitivity at the ordinary time, and performing phase adjustment processing based on the detection signal detected by the optical sensor part 140 with a second detection sensitivity after allowing the optical sensor part 140 to set at the second detection sensitivity which is lower than the first detection sensitivity at the initial time. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００４５】
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。
【００４６】
【数２】

【００４７】
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。
【００４８】
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。
【００４９】
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。
【００５０】
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。
【００５１】
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。
【００５２】
【数３】
評価値Ｂ＝安定度ＳＬ＋安定度ＳＨ…（３）
【００５３】
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。
【００５４】
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。
【００５５】
【数４】
評価値Ｃ＝評価値Ａ＋評価値Ｂ…（４）
【００５６】
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。
【００５７】
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。
【００５８】
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。
【００５９】
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。
【００６０】
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ＣＴＬ１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。
【００６１】
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。
【００６２】
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。
【００６３】
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。
【００６４】
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。
【００６５】
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。
【００６６】
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。
【００６７】
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。
【００６８】
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。
【００６９】
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。
【００７０】
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。
【００７１】
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。
【００７２】
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。
【００７３】
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。
【００７４】
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。
【００７５】
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。
【００７６】
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、さらに、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。
【００７７】
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。
【００７８】
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。
【００７９】
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。
【００８０】
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。
【００８１】
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。
【００８２】
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比べて装置の集約化、小型化を行うことができる。
【００８３】
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。
【００８４】
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。
【００８５】
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。
【００８６】
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。
【００８７】
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。
【００８８】
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。
【００８９】
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。
【００９０】
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。
【００９１】
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）。
【００９２】
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）。
【００９３】
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）。
【００９４】
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。
【００９５】
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。
【００９６】
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。
【００９７】
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。
【００９８】
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。
【００９９】
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、指針位置検出を行い、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。
【０１００】
図１７は、図１に示した電波修正時計の位相合せおよび指針位置検出処理の動作を説明するためのフローチャートである。図１７を参照しながら電波修正時計１の動作、特に発光素子の光量を中心に説明する。
【０１０１】
ステップＳＴ３１において、制御回路１４では、まず秒針の原点を検索するために、秒針車と時分針車の透光穴が貫通する場所を探す位相合せ処理を行う。
詳細には制御回路１４は、このとき、時分針車の動きが遅いため、貫通光が非常に弱い位置で位相合せを完了した場合には秒針車の原点検索に失敗することがあるので、ロウレベルのドライブ信号ＤＲ２およびＤＲ３を出力して、発光素子１４２を弱い光量で発光させる。
ステップＳＴ３２において、制御回路１４では、駆動信号ＣＴＬ１およびＣＴＬ２を出力して、秒針車および時分針車を貫通位置まで回転させていそうあわせを行う。
【０１０２】
ステップＳＴ３３において、制御回路１４では、ロウレベルのドライブ信号ＤＲ２および、ハイレベルのドライブ信号ＤＲ３を出力して、発光素子１４２を強い光量で発光させて、指針位置検出処理を行う。
【０１０３】
図１８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１８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。
【０１０４】
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）。
【０１０５】
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。
【０１０６】
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。
【０１０７】
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）の位置に修正される。
【０１０８】
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）。
【０１０９】
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。
【０１１０】
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）。
【０１１１】
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刻修正は、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。
【０１１２】
図１９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１９（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１９（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１９（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１９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。
【０１１３】
そこで、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】
以上説明したように、秒針および透穴１２３ｃが設けられた秒針車１２３を回転させる秒針駆動系１２０と、分針および時針および透穴が設けられた分針車１３４および時針車１３６を、秒針駆動系１２０の回転速度よりも遅い回転速度で回転させる時分針駆動系１３０と、秒針駆動系１２０の透穴、および時分針駆動系１３０の透穴が略正対した時に検出信号を得る光センサ１４４および発光素子１４２を含む光センサ部１４０と、通常時の位置検出処理では、少なくとも秒針駆動系１２０または時分針駆動系１３０を駆動し、光センサ部１４０に第１の検出感度で設定させて、当該第１の検出感度で光センサ部１４０が検出した検出信号に基づいて秒針車１２３、分針車１３４および時針車１３６それぞれの指針位置検出処理を行い、初期の位相合せ処理では、秒針駆動系１２０および時分針駆動系１３０を駆動し、光センサ部１４０に第１の検出感度よりも低い第２の検出感度に設定させて、当該第２の検出感度で光センサ部１４０が検出した検出信号に基づいて秒針車１２３、分針車１３４および時針車１３６の位相合せ処理を行い、検出した指針位置に基づいて標準電波信号に応じた秒針および時分針による時刻表示の修正を行う制御回路１４を設けたので、指針車の位相合せの際に、正確に指針位置を検出することができる。
【０１１６】
図２０は、本発明に係る電波修正時計の第２実施形態の電気的な機能ブロック図である。
第２実施形態に係る電波修正時計１ａは、第１実施形態に係る電波修正時計１と略同じ構成であり、相違点のみ説明する。第２実施形態では、位相合わせ動作の際に、光検出センサ部１４０の検出感度を低下させるために、受光素子１４４の感度を低下させる。
【０１１７】
詳細には、ドライブ回路１８ａとして、トランジスタＱ２、抵抗Ｒ３、Ｒ４を有する。接続関係は、第１実施形態に係るドライブ回路１８と同様である。
光検出センサ部１４０ａは、第１実施形態に係る光センサ部１４０と略同じ構成であり、新たに制御回路１４から出力される信号ＤＲ４が抵抗Ｒ８を介して光検出センサ１４４のコレクタに接続されている。
【０１１８】
上述した構成において、制御回路１４は、位相合せ処理の際に、ハイレベルの信号ＤＲ４を出力し、受光素子１４４の負荷を大きくして受光感度を低下させる。そして、駆動信号ＣＴＬ１，ＣＴＬ２を出力して位相合せ処理を行う。
【０１１９】
その後、制御回路１４は、通常の位置検索処理の際には、ロウレベルの信号ＤＲ４を出力して，受光素子１４４の負荷を小さくして受光感度を通常の状態に戻す。そして、駆動信号ＣＴＬ１，ＣＴＬ２を出力して秒針車および時分針車の位置検索処理を行う。
【０１２０】
以上説明したように、本実施形態では、受光素子１４４の感度を低下させて位相合せ処理を行うことにより、正確に指針位置を検出することができる。
また、例えば第１実施形態に係る電波修正時計１と比べて、トランジスタを設ける必要がなく、抵抗素子を設けるだけでよい。
【０１２１】
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。
第１および第２実施形態では、位相合せ処理の際に、独立に、発光素子１４２の発光量を低下させ、また受光素子１４４の感度を低下させていたが、この形態に限られるものではない。例えば、同時に発光素子１４２の発光量を低下させ、受光素子１４４の感度を低下させてもよい。
【発明の効果】
本発明によれば、異なる周波数の標準電波信号を短時間で選択できる指針位置検出装置および電波修正時計を提供することができる。
また、例えば受信回路に余計な回路を設けることなく、異なる周波数の標準電波信号を選択できる。
【０１２２】
【図面の簡単な説明】
【図１】本発明に係る電波修正時計の第１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】図１に示した電波修正時計の位相合せおよび指針位置検出処理の動作を説明するためのフローチャートである。図１７を参照しながら電波修正時計１の動作、特に発光素子の光量を中心に説明する。
【図１８】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１９】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２０】本発明に係る電波修正時計の第２実施形態の電気的な機能ブロック図である。
【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、１４０１…内部時計、１４０２…メモリ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a pointer position detection device that aligns a pointer of a timepiece and a radio-controlled timepiece.
[0002]
[Prior art]
Conventionally, the hand position search of a movement of a radio timepiece is performed by detecting penetration of a light transmitting hole opened in a gear with an optical sensor.
For example, each of the second hand and the hour / minute hand is driven by a separate motor, and in order to search for the position of the pointer, first, search for a place through which the light transmission hole of the gear provided with the second hand and the hour / minute hand passes. Align operation ”.
When the light is penetrated by the “phase adjustment operation”, the hour / minute hand motor is stopped, the second hand motor is driven, and the pointer position is detected based on the on / off pattern of the light transmitted through the light transmitting hole. Stops at the pointer position.
The hour / minute hand motor is driven, and the pointer position of the hour / minute hand wheel is detected based on the on / off pattern of light passing through the transmission hole (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2002-228775 A (FIG. 1-19)
[0004]
[Problems to be solved by the invention]
However, since the moving angular speed of the gear driven by the hour / minute hand drive is low, the amount of light penetrating in the vicinity of the light transmission hole of the gear does not increase / decrease digitally but gradually increases and decreases gradually.
For this reason, the determination of on / off of light transmission may be out of order due to minute vibrations or differences in position detection timing.
For example, if the hour / minute hand gear is stopped at a position where a small amount of transmitted light is transmitted, which is different from the normal position, the on / off pattern is distorted because the amount of transmitted light is halfway, and the position of the second hand There may be a case where the detection cannot be performed normally or a problem such as a long time is taken.
[0005]
Also, for example, in a general radio-controlled timepiece, after the positioning, the second hand is stopped first (the movement amount of the second hand wheel is large, so a penetration result close to on / off is obtained), and the hour / minute hand position search is started. In this case, since the hour / minute hand position search takes time, the second hand is stopped at a predetermined position for a long time, which may give an unsightly impression to the user.
In addition, for example, when the second hand wheel is misaligned, the above-described weak penetration state occurs, and improvement is desired.
[0006]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pointer position detection device and a radio wave correction timepiece that can accurately detect the position of a pointer when phasing a pointer wheel. There is.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, a first pointer drive system for rotating a first pointer wheel provided with a first light transmission unit and a second light transmission unit are provided. A second pointer driving system for rotating the second pointer wheel at a rotational speed lower than the rotational speed of the first pointer driving system; a first light transmission portion of the first pointer driving system; and the second And an optical sensor unit that obtains a detection signal when the second light transmission unit of the pointer drive system substantially faces and a pointer position detection process at a normal time drives at least the first or second pointer drive system, The sensor unit is set with the first detection sensitivity, and the pointer position detection process for each of the first and second pointer wheels is performed based on the detection signal detected by the optical sensor unit with the first detection sensitivity. In the phase matching process, the first and second pointer drive systems are driven and the optical sensor is driven. The second detection sensitivity is set to a second detection sensitivity lower than the first detection sensitivity, and the phases of the first and second indicator wheels are determined based on the detection signal detected by the photosensor unit with the second detection sensitivity. And a control means for performing a matching process.
[0008]
According to the first aspect of the present invention, the first pointer driving system rotates the first pointer wheel provided with the first light transmission unit, and the second pointer driving system includes the second light transmission unit. The second pointer wheel is rotated at a rotation speed slower than the rotation speed of the first pointer drive system.
In the optical sensor unit, a detection signal is obtained when the first light transmission unit of the first pointer driving system and the second light transmission unit of the second pointer driving system substantially face each other.
In the control means, in the normal pointer position detection process, at least the first or second pointer drive system is driven, the optical sensor unit is set with the first detection sensitivity, and the optical sensor unit is set with the first detection sensitivity. The first and second pointer wheels are detected on the basis of the detection signals detected by the first and second pointer wheels, and in the initial phase matching process, the first and second pointer drive systems are driven, and the optical sensor unit receives the first The second detection sensitivity is set lower than the detection sensitivity, and the phase adjustment processing of the first and second pointer wheels is performed based on the detection signal detected by the optical sensor unit with the second detection sensitivity.
[0009]
In order to achieve the above object, a second aspect of the present invention is a radio-controlled timepiece that corrects the time display using the first and second hands based on a standard time radio signal, the first hand and the second hand A first pointer driving system for rotating a first pointer wheel provided with one light transmission portion and a second pointer wheel provided with the second pointer and a second light transmission portion are connected to the first pointer driving system. A second pointer drive system that rotates at a rotation speed slower than the first rotation speed, a first light transmission portion of the first pointer drive system, and a second light transmission portion of the second pointer drive system. In the optical sensor unit that obtains a detection signal at the time of the counter, and in the normal pointer position detection process, at least the first or second pointer drive system is driven, and the optical sensor unit is set with the first detection sensitivity, Based on the detection signal detected by the optical sensor unit with the first detection sensitivity Each of the first and second pointer wheels is subjected to the pointer position detection process, and in the initial phase matching process, the first and second pointer drive systems are driven, and the optical sensor unit is lower than the first detection sensitivity. The second detection sensitivity is set, and the phase adjustment processing of the first and second pointer wheels is performed based on the detection signal detected by the optical sensor unit with the second detection sensitivity, and the detected pointer position is set. And control means for correcting the time display by the first and second hands in accordance with the standard radio wave signal.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an electrical functional block diagram of a first 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 switch 12, an oscillation circuit 13, a control circuit 14, a drive circuit 15, a light emitting element 16 as notification means, and a buffer circuit 17. , A drive circuit 18, a timepiece main body 100, a second hand motor 121, an hour / minute hand motor 131, a light detection sensor unit 140, a manual correction system 150, transistors Q1 and Q2, and resistance elements R1 to R7.
[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 switch 12 is operated when receiving the standard radio wave and correcting the counter of the internal clock 1401 to the standard time, and outputs a signal S12 to the control circuit 14.
When the switch 12 is operated and the signal S12 is input, the control circuit 14 causes the standard radio signal reception system 11 to receive the standard radio wave and output a time code, and controls various counters of the internal clock 1401 based on the time code. Correct to time.
[0023]
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.
[0024]
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.
[0025]
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.
[0026]
The control circuit 14 causes the light emitting element 142 of the light detection sensor unit 140 to emit light with a strong first light quantity during the normal position of the pointer wheel, and during the origin detection process, the light emitting element 142. Is emitted with a second light amount weaker than the first light amount.
[0027]
Specifically, as shown in FIG. 2, the light detection sensor 140 has 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 faces 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 the lower case 111.
[0028]
The anode of the light emitting element 142 is connected to the resistance element R4 connected to the collector of the pnp transistor Q2, and the resistance element R6 connected to the collector of the transistor Q3, and the cathode is grounded and connected to the emitter of the light receiving element. Yes.
[0029]
The collector of the light receiving element 144 is connected to the control circuit 14. The connection line to the control circuit 14 is an output line for the detection signal DT1 to the control circuit 14, and this output line is connected to the supply line of the power supply voltage _Vcc via the resistance element R7.
[0030]
The emitter of the transistor Q2 of the drive circuit 18 is connected to the supply line of the power supply voltage _Vcc , and the base is connected to the output line of the drive signal DR2 via the resistance element R3.
The emitter of the transistor Q3 of the drive circuit 18 is connected to the supply line of the power supply voltage _Vcc , and the base is connected to the output line of the drive signal DR3 via the resistance element R5.
[0031]
When the control circuit 14 outputs the high level drive signal DR2 and the high level drive signal DR3, the light emitting element 142 does not emit light.
Further, when the control circuit 14 outputs the low level drive signal DR2 and outputs the high level drive signal DR3, the light emitting element 142 emits light with a predetermined first light amount.
Further, when the control circuit 14 outputs the low level drive signal DR2 and outputs the low level drive signal DR3, the light emitting element 142 emits light with a second light amount lower than the first light amount.
[0032]
As described above, the control circuit 14 outputs the low-level drive signal DR3 during the origin detection process, causes the light-emitting element 142 to emit light with the second light amount lower than the first light amount, and the normal pointer wheel. In the position search operation, the high-level drive signal DR3 is output, and the light emitting element 142 is caused to emit light with the first light amount having a high light amount.
[0033]
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.
[0034]
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.
[0035]
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.
[0036]
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.
[0037]
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.
[0038]
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.
[0039]
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.
[0040]
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.
[0041]
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.
[0042]
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.
[0043]
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.
[0044]
[Expression 1]

[0045]
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).
[0046]
[Expression 2]

[0047]
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.
[0048]
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.
[0049]
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.
[0050]
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.
[0051]
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).
[0052]
[Equation 3]
Evaluation value B = Stability SL + Stability SH (3)
[0053]
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.
[0054]
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.
[0055]
[Expression 4]
Evaluation value C = Evaluation value A + Evaluation value B (4)
[0056]
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.
[0057]
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.
[0058]
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.
[0059]
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.
[0060]
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 CTL1 to perform fast-forward driving or the like, and the time display is corrected by the hands.
[0061]
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.
[0062]
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.
[0063]
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.
[0064]
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.
[0065]
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.
[0066]
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.
[0067]
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.
[0068]
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.
[0069]
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.
[0070]
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.
[0071]
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.
[0072]
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.
[0073]
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.
[0074]
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.
[0075]
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.
[0076]
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. In addition, the arc-shaped through hole 136e and the arc-shaped through hole 136c are formed with a central angle α10 and separated by 30 °, and the lengths of the arc-shaped through holes 136c, 136d, and 136e are center angles 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.
[0077]
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.
[0078]
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.
[0079]
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.
[0080]
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 112d having a predetermined diameter is formed on the bottom surface of the attachment recess 112c. Is opened. 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.
[0081]
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.
[0082]
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, compared to the case where these holes are provided separately. Centralization and downsizing of the device can be performed.
[0083]
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.
[0084]
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.
[0085]
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.
[0086]
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.
[0087]
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.
[0088]
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.
[0089]
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.
[0090]
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.
[0091]
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).
[0092]
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).
[0093]
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). ).
[0094]
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.
[0095]
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.
[0096]
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.
[0097]
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.
[0098]
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.
[0099]
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., detects the pointer position, outputs the control signals CTL1, CTL2 to the stepping motors 121, 131 in accordance with the standard time, performs the fast-forward operation, Set the hands to standard time.
[0100]
FIG. 17 is a flowchart for explaining the operation of the phase adjustment and the hand position detection process of the radio-controlled timepiece shown in FIG. The operation of the radio-controlled timepiece 1 will be described with reference to FIG. 17, particularly the light quantity of the light emitting element.
[0101]
In step ST31, in order to search for the origin of the second hand, the control circuit 14 first performs a phase matching process for searching for a place through which the light transmission holes of the second hand wheel and the hour / minute hand wheel pass.
Specifically, since the hour / minute hand wheel moves slowly at this time, the control circuit 14 may fail to search for the origin of the second hand wheel when the phase alignment is completed at a position where the penetrating light is very weak. Drive signals DR2 and DR3 are output to cause the light emitting element 142 to emit light with a weak light quantity.
In step ST32, the control circuit 14 outputs the drive signals CTL1 and CTL2, and performs matching so that the second hand wheel and the hour / minute hand wheel are rotated to the penetrating position.
[0102]
In step ST33, the control circuit 14 outputs a low-level drive signal DR2 and a high-level drive signal DR3 to cause the light emitting element 142 to emit light with a strong light amount, and performs a pointer position detection process.
[0103]
FIG. 18 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.
[0104]
Subsequently, the control signal CTL1 is output from the control circuit 14, the second 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 _Vcc level). It is determined whether or not the signal has been switched from low to low (ST103).
[0105]
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. It is determined whether or not the voltage _Vcc level has been switched to a low level (ST104 to ST106).
If the detection signal DT1 output from the phototransistor does not switch from the high level (power supply voltage _Vcc level) to the low level even when the number of pulses reaches 9, the hour / minute hand stepping motor 131 performs one step (pulse). Then, the second hand stepping motor 121 is step-driven again (ST102), and the second hand wheel 123 is rotationally driven.
[0106]
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.
[0107]
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, on the hour (0 second).
[0108]
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).
[0109]
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.
[0110]
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).
[0111]
Here, the time correction by comparing the output pattern with the output pattern stored in advance is performed by matching with any of the three types of patterns.
[0112]
FIG. 19 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. 19A, 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. 19B, the output pattern of the phototransistor by the hour hand wheel 136 has three different widths D portion, E portion, and C portion where the light shielding portion acts. Is a pattern that appears alternately at a predetermined interval. As shown in FIG. 19C, an output pattern obtained by combining the two is a pattern in which the D portion, the B portion, and the A portion are combined, and the E portion, 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. 19, the part of the pattern that is turned on is actually a part that is turned off by the light shielding part of the third wheel & pinion 133, and is a tooth-missing pattern.
[0113]
Therefore, 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, at 8:00. If a pattern composed of a combination of minute, C, B and A is confirmed, for example, it is set in advance as 12:00, and when one of these patterns is detected, the hour and minute hands By stopping the stepping motor 131, the minute hand wheel 134 and the hour hand wheel 136, that is, the minute hand and the 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]
As described above, the second hand drive system 120 for rotating the second hand wheel 123 provided with the second hand and the through-hole 123c, the minute hand wheel 134 and hour hand wheel 136 provided with the minute hand, the hour hand and the through-hole, and the second hand drive system 120 are provided. Optical sensor 144 and light emission for obtaining a detection signal when the hour / minute hand drive system 130 rotated at a rotation speed slower than the rotation speed, the through hole of the second hand drive system 120, and the through hole of the hour / minute hand drive system 130 substantially face each other. In the optical sensor unit 140 including the element 142 and the normal position detection process, at least the second hand drive system 120 or the hour / minute hand drive system 130 is driven, and the optical sensor unit 140 is set with the first detection sensitivity. The second hand wheel 123, the minute hand wheel 134, and the hour hand wheel 136 are detected based on the detection signal detected by the optical sensor unit 140 with the detection sensitivity of 1, respectively. In the phase matching process, the second hand drive system 120 and the hour / minute hand drive system 130 are driven, the optical sensor unit 140 is set to a second detection sensitivity lower than the first detection sensitivity, and the second detection sensitivity is used. Based on the detection signal detected by the optical sensor unit 140, the second hand wheel 123, the minute hand wheel 134, and the hour hand wheel 136 are phase-matched, and the time display by the second hand and the hour / minute hand according to the standard radio wave signal based on the detected pointer position. Since the control circuit 14 for correcting the above is provided, the position of the pointer can be accurately detected when the phase of the pointer wheel is adjusted.
[0116]
FIG. 20 is an electrical functional block diagram of the second embodiment of the radio-controlled timepiece according to the invention.
The radio-controlled timepiece 1a according to the second embodiment has substantially the same configuration as the radio-controlled timepiece 1 according to the first embodiment, and only differences will be described. In the second embodiment, the sensitivity of the light receiving element 144 is reduced in order to reduce the detection sensitivity of the light detection sensor unit 140 during the phase matching operation.
[0117]
Specifically, the drive circuit 18a includes a transistor Q2 and resistors R3 and R4. The connection relationship is the same as that of the drive circuit 18 according to the first embodiment.
The photodetection sensor unit 140a has substantially the same configuration as the photosensor unit 140 according to the first embodiment, and a signal DR4 newly output from the control circuit 14 is connected to the collector of the photodetection sensor 144 via a resistor R8. ing.
[0118]
In the configuration described above, the control circuit 14 outputs a high-level signal DR4 during the phase matching process, increases the load on the light receiving element 144, and decreases the light receiving sensitivity. Then, drive signals CTL1 and CTL2 are output to perform phase matching processing.
[0119]
Thereafter, the control circuit 14 outputs a low-level signal DR4 during normal position search processing, reduces the load on the light receiving element 144, and returns the light receiving sensitivity to the normal state. Then, the drive signals CTL1 and CTL2 are output to perform position search processing for the second hand wheel and the hour / minute hand wheel.
[0120]
As described above, in the present embodiment, the pointer position can be accurately detected by performing the phase matching process while reducing the sensitivity of the light receiving element 144.
Further, for example, as compared with the radio wave correction timepiece 1 according to the first embodiment, it is not necessary to provide a transistor, and it is only necessary to provide a resistance element.
[0121]
Note that the present invention is not limited to the present embodiment, and various suitable modifications can be made.
In the first and second embodiments, the light emission amount of the light emitting element 142 and the sensitivity of the light receiving element 144 are reduced independently during the phase matching process, but the present invention is not limited to this mode. . For example, the light emission amount of the light emitting element 142 may be reduced at the same time, and the sensitivity of the light receiving element 144 may be reduced.
【The invention's effect】
According to the present invention, it is possible to provide a pointer position detection device and a radio-controlled timepiece that can select standard radio signals of different frequencies in a short time.
Further, for example, a standard radio signal having a different frequency can be selected without providing an extra circuit in the receiving circuit.
[0122]
[Brief description of the drawings]
FIG. 1 is an electrical functional block diagram of a first 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.
17 is a flowchart for explaining the operation of phase alignment and hand position detection processing of the radio-controlled timepiece shown in FIG. 1; FIG. The operation of the radio-controlled timepiece 1 will be described with reference to FIG. 17, particularly the light quantity of the light emitting element.
FIG. 18 is a diagram showing a detection output pattern obtained by combining a minute hand wheel, an hour hand wheel, and both in a correction operation;
FIG. 19 is a diagram for explaining an output pattern of detection light of the radio-controlled timepiece shown in FIG. 1;
FIG. 20 is an electrical functional block diagram of a second embodiment of the radio-controlled timepiece according to the invention.
[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 ... minute hand pipe, 135 ... minute wheel, 136 ... hour hand wheel (fifth detection gear, second pointer wheel), 136c ... arc-shaped through hole, 136d ... arc-shaped through-hole, 136e ... arc-shaped through-hole, 136g ... groove (second index), 136p ... hour hand pipe, 140 ... light detection sensor, 142 ... light emitting element, 143 ... circuit board, 144: light receiving element, 150: manual correction system, 151: manual correction axis, 151b: head, 1401: internal clock, 1402: memory.

Claims (6)

A first pointer drive system for rotating a first pointer wheel provided with a first light transmission portion;
A second pointer drive system for rotating a second pointer wheel provided with a second light transmission section at a rotational speed slower than the rotational speed of the first pointer drive system;
An optical sensor unit that obtains a detection signal when the first light transmission unit of the first pointer drive system and the second light transmission unit of the second pointer drive system are substantially facing each other;
In the normal pointer position detection process, at least the first or second pointer drive system is driven, the optical sensor unit is set with the first detection sensitivity, and the optical sensor unit is configured with the first detection sensitivity. Based on the detected detection signal, a pointer position detection process is performed for each of the first and second pointer wheels. In an initial phase matching process, the first and second pointer drive systems are driven, and the optical sensor unit A second detection sensitivity lower than the first detection sensitivity is set, and the phase adjustment processing of the first and second pointer wheels is performed based on the detection signal detected by the optical sensor unit with the second detection sensitivity. A pointer position detection device having control means for performing the operation. The optical sensor unit includes a light emitting unit that emits a detection signal, and a light receiving unit that receives the detection signal when the first and second light transmission units face each other substantially,
The control means causes the light emitting unit to emit light with a first light amount to perform the pointer position detection processing, and causes the light emitting unit to emit light with a second light amount smaller than the first light amount to perform the phase matching processing. The pointer position detection device described in 1. The optical sensor unit includes a light emitting unit that emits a detection signal, and a light receiving unit that receives the detection signal when the first and second light transmission units face each other substantially,
The control means sets the light receiving portion to a first light receiving sensitivity, receives the detection signal, performs the pointer position detection process, and sets the light receiving portion to a second sensitivity lower than the first light receiving sensitivity. The pointer position detection device according to claim 1, wherein the phase matching process is performed by receiving the detection signal. A radio-controlled timepiece that corrects the time display according to the first and second hands based on a standard time radio signal,
A first pointer drive system for rotating a first pointer wheel provided with the first pointer and the first light transmission portion;
A second pointer drive system for rotating the second pointer wheel provided with the second pointer and the second light transmission section at a rotational speed lower than the rotational speed of the first pointer drive system;
An optical sensor unit that obtains a detection signal when the first light transmission unit of the first pointer drive system and the second light transmission unit of the second pointer drive system are substantially facing each other;
In the normal pointer position detection process, at least the first or second pointer drive system is driven, the optical sensor unit is set with the first detection sensitivity, and the optical sensor unit is configured with the first detection sensitivity. Based on the detected detection signal, a pointer position detection process for each of the first and second pointer wheels is performed. In an initial phase matching process, the first and second pointer drive systems are driven, and the optical sensor unit A second detection sensitivity lower than the first detection sensitivity is set, and the phase adjustment processing of the first and second pointer wheels is performed based on the detection signal detected by the optical sensor unit with the second detection sensitivity. And a control means for correcting time display by the first and second hands according to the standard radio signal based on the detected hand position. The optical sensor unit includes a light emitting unit that emits a detection signal, and a light receiving unit that receives the detection signal when the first and second light transmission units face each other substantially,
5. The control unit according to claim 4, wherein the control unit performs the pointer position detection process by causing the light emitting unit to emit light with a first light amount, and performs the phase matching process by causing the light emitting unit to emit light with a second light amount smaller than the first light amount. Radio wave correction clock of mention. The optical sensor unit includes a light emitting unit that emits a detection signal, and a light receiving unit that receives the detection signal when the first and second light transmission units face each other substantially,
The control means sets the light receiving portion to a first light receiving sensitivity, receives the detection signal, performs the pointer position detection process, and sets the light receiving portion to a second sensitivity lower than the first light receiving sensitivity. The radio-controlled timepiece according to claim 4 or 5, wherein the phase matching process is performed by receiving the detection signal.

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