JP2010204066A

JP2010204066A - Pointer drive control device and analog electronic timepiece

Info

Publication number: JP2010204066A
Application number: JP2009053026A
Authority: JP
Inventors: Yuki Oshita; 佑樹尾下
Original assignee: Casio Computer Co Ltd
Current assignee: Casio Computer Co Ltd
Priority date: 2009-03-06
Filing date: 2009-03-06
Publication date: 2010-09-16

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pointer drive control device for preventing a shift in position of a pointer and an analog electronic timepiece. <P>SOLUTION: The pointer drive control device includes: a rotating body having a plurality of transmission holes 25a placed at predetermined intervals along the direction of rotation; two light-receiving sections 5 and 6 for detecting movements of the transmission holes 25a; stoppage control means for, in accordance with detection of a magnetic field by magnetic field detecting means, stopping a step motor that drives the rotating body; rotation amount calculating means for calculating the amount of rotation of the rotating body in accordance with the light-receiving state of the light-receiving sections 5 and 6 during the stoppage of drive of the step motor; and correction control means for, when the amount of detection by the magnetic field detecting means becomes small, correcting the position of the pointer by driving the step motor a step number of times obtained by adding or subtracting the amount of rotation as calculated by the rotation amount calculating means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明は、指針を駆動する指針駆動制御装置、ならびに、指針により時刻を表示するアナログ電子時計に関する。 The present invention relates to a pointer drive control device that drives a pointer, and an analog electronic timepiece that displays time by a pointer.

従来、指針の位置ズレを検出する針位置検出機構を有したアナログ電子時計が知られている。この針位置検出機構は、例えば指針が所定の時間位置に来たときに、この状態を検出して指針の位置ズレが発生していないか検査するものである。 Conventionally, an analog electronic timepiece having a hand position detecting mechanism for detecting a positional deviation of a pointer is known. This needle position detection mechanism detects, for example, whether or not the pointer is misaligned by detecting this state when the pointer reaches a predetermined time position.

また、本発明に関連する従来技術として、特許文献１には、大きな外部磁界が検出された場合に指針の駆動を一旦停止させ、外部磁界が小さくなったら、指針の停止中に指針が移動するはずだったステップ数早送りして指針の位置を回復させるという耐磁機構を有する電子時計が開示されている。 Further, as a related art related to the present invention, Patent Document 1 discloses that the driving of a pointer is temporarily stopped when a large external magnetic field is detected, and when the external magnetic field becomes small, the pointer moves while the pointer is stopped. There has been disclosed an electronic timepiece having a magnetic resistance mechanism in which the position of the pointer is restored by fast-forwarding the number of steps that should have been.

特開昭６２−１９５５８３号公報JP-A-62-195583

アナログ電子時計における従来の針位置検出機構では、例えば１時間に１回など検査間隔が長くなるので、指針の位置ズレが発生した場合に、次の検査時間まで長い間、指針がずれたままになるという課題があった。 In the conventional hand position detection mechanism in an analog electronic timepiece, for example, the inspection interval becomes longer, such as once per hour. Therefore, when the pointer is misaligned, the pointer remains displaced for a long time until the next inspection time. There was a problem of becoming.

また、上記の耐磁機構を有する電子時計では、大きな外部磁界が付加されて指針の駆動を一旦停止した際、停止したはずのステップモータが外部磁界の影響で回転してしまうことがあり、この場合、運針を再開させた際に、指針の位置がずれたままになってしまうという課題がある。 In addition, in the electronic timepiece having the above-described anti-magnetic mechanism, when a large external magnetic field is added and driving of the hands is temporarily stopped, the step motor that should have stopped may rotate due to the influence of the external magnetic field. When the hand movement is resumed, there is a problem that the position of the pointer remains shifted.

この発明の目的は、指針の位置ズレを防止することのできる指針駆動制御装置およびアナログ電子時計を提供することにある。 An object of the present invention is to provide a pointer drive control device and an analog electronic timepiece that can prevent displacement of the pointer.

上記目的を達成するため、請求項１記載の発明は、指針駆動制御装置において、
回転位置により情報を指し示す指針と、
この指針を回転させるステップモータと、
このステップモータの駆動を制御する駆動制御手段と、
回転方向に所定間隔で配置された複数の透過孔を有するとともに、前記ステップモータの１ステップの回転により所定角度ずつ回転される回転体と、
この回転体の前記複数の透過孔が通過する部位へ光を照射する発光部と、
前記複数の透過孔の並び方向と対応した方向に並んで配置され、前記発光部の光の照射位置に前記透過孔が位置したときに当該透過孔を通過した光を検出する少なくとも２個の受光部と、
磁界を検出する磁界検出手段と、
この磁界検出手段の磁界の検出に基づいて前記駆動制御手段による前記ステップモータの駆動を停止させる停止制御手段と、
この停止制御手段による前記ステップモータの駆動停止中に、前記発光部を駆動する発光制御手段と、
前記停止制御手段による前記ステップモータの駆動停止中に、前記少なくとも２個の受光部の受光状態に基づいて前記回転体の回転量を求める回転量算出手段と、
この回転量算出手段で回転量が求められた後、前記磁界検出手段により検出される磁界が小さくなったら、前記ステップモータを前記回転量を加減算したステップ数駆動して、前記指針の位置を補正する補正制御手段と、
を備えたことを特徴としている。 In order to achieve the above object, an invention according to claim 1 provides a pointer drive control device comprising:
A pointer that points to information by the rotational position;
A step motor for rotating the pointer,
Drive control means for controlling the drive of the step motor;
A rotating body having a plurality of transmission holes arranged at predetermined intervals in the rotation direction and rotated by a predetermined angle by one step rotation of the step motor;
A light emitting unit that irradiates light to a portion through which the plurality of transmission holes of the rotating body passes;
At least two light receiving elements that are arranged side by side in a direction corresponding to the direction in which the plurality of transmission holes are arranged, and that detect light that has passed through the transmission holes when the transmission holes are positioned at the light irradiation positions of the light emitting units. And
Magnetic field detection means for detecting a magnetic field;
Stop control means for stopping the drive of the step motor by the drive control means based on detection of the magnetic field of the magnetic field detection means;
Light emission control means for driving the light emitting unit during stoppage of driving of the step motor by the stop control means,
Rotation amount calculation means for determining the rotation amount of the rotating body based on the light receiving states of the at least two light receiving units while the step motor is stopped by the stop control means;
After the rotation amount is calculated by the rotation amount calculation means, when the magnetic field detected by the magnetic field detection means becomes small, the step motor is driven by the number of steps obtained by adding or subtracting the rotation amount to correct the position of the pointer. Correction control means for
It is characterized by having.

請求項２記載の発明は、請求項１記載の指針駆動制御装置において、
前記複数の透過孔は、前記ステップモータの１ステップの回転に対応する前記回転体の回転角度ごとに形成されていることを特徴としている。 The invention described in claim 2 is the pointer drive control device according to claim 1,
The plurality of transmission holes are formed for each rotation angle of the rotating body corresponding to one step rotation of the step motor.

請求項３記載の発明は、請求項１記載の指針駆動制御装置において、
前記回転体は、前記ステップモータの回転運動を前記指針に伝達する歯車であることを特徴としている。 The invention according to claim 3 is the pointer drive control device according to claim 1,
The rotating body is a gear that transmits the rotational motion of the step motor to the pointer.

請求項４記載の発明は、請求項１記載の指針駆動制御装置において、
前記停止制御手段は、前記磁界検出手段により所定のレベルを超える磁界が検出された場合に前記ステップモータの駆動を停止させることを特徴としている。 According to a fourth aspect of the present invention, in the pointer drive control device according to the first aspect,
The stop control unit stops driving the step motor when a magnetic field exceeding a predetermined level is detected by the magnetic field detection unit.

請求項５記載の発明は、請求項１記載の指針駆動制御装置において、
前記回転量算出手段は、
前記少なくとも２個の受光部のうち、第１受光部で受光、第２受光部で受光の状態から、順次、前記第１受光部で受光、前記第２受光部で非受光の状態、前記第１受光部で非受光、前記第２受光部で受光の状態、前記第１受光部で受光、前記第２受光部で受光の状態への遷移が検出されたら、前記回転体が前記第１受光部側から前記第２受光部側へ向けた回転方向に、前記複数の透過孔の形成間隔分回転したと判別し、
第１受光部で受光、第２受光部で受光の状態から、順次、前記第１受光部で非受光、前記第２受光部で受光の状態、前記第１受光部で受光、前記第２受光部で非受光の状態、前記第１受光部で受光、前記第２受光部で受光の状態への遷移が検出されたら、前記回転体が前記第２受光部側から前記第１受光部側へ向けた回転方向に、前記複数の透過孔の形成間隔分回転したと判別することを特徴としている。 The invention according to claim 5 is the pointer drive control device according to claim 1,
The rotation amount calculating means includes
Of the at least two light receiving units, the first light receiving unit receives light and the second light receiving unit receives light sequentially, the first light receiving unit receives light, the second light receiving unit receives no light, and the first light receiving unit receives light. When a transition to a non-light-receiving state at one light-receiving unit, a light-receiving state at the second light-receiving unit, a light-receiving state at the first light-receiving unit, and a light-receiving state at the second light-receiving unit is detected, the rotating body receives the first light-receiving unit. It is determined that the plurality of transmission holes are rotated in the rotation direction from the part side toward the second light receiving part side,
The first light receiving unit receives light and the second light receiving unit receives light in order, the first light receiving unit receives no light, the second light receiving unit receives light, the first light receiving unit receives light, and the second light receiving unit sequentially receives light. When the transition to the non-light receiving state, the light receiving by the first light receiving unit, and the light receiving state by the second light receiving unit is detected, the rotating body moves from the second light receiving unit side to the first light receiving unit side. It is characterized in that it is determined that it has been rotated by the formation interval of the plurality of transmission holes in the directed rotation direction.

請求項６記載の発明は、請求項１記載の指針駆動制御装置において、
隣接する前記２個の受光部の間で光を遮るとともに前記回転体の側に突出した遮光部材が設けられていることを特徴としている。 The invention described in claim 6 is the pointer drive control device according to claim 1,
A light shielding member that blocks light between the two adjacent light receiving portions and protrudes toward the rotating body is provided.

請求項７記載の発明は、請求項１記載の指針駆動制御装置において、
前記ステップモータの回転を検出する磁気センサを備え、
前記磁界検出手段が前記磁気センサと兼用されていることを特徴としている。 The invention according to claim 7 is the pointer drive control device according to claim 1,
A magnetic sensor for detecting the rotation of the step motor;
The magnetic field detection means is also used as the magnetic sensor.

請求項８記載の発明は、請求項１記載の指針駆動制御装置において、
前記磁気センサの検出量から前記ステップモータの駆動により発生される磁界に対応する補正量を差し引きするオフセット手段を備え、
前記停止制御手段は、前記オフセット手段により前記補正量が差し引きされた前記センサの検出量に基づいて前記ステップモータの駆動を停止させることを特徴としている。 The invention according to claim 8 is the pointer drive control device according to claim 1,
An offset means for subtracting a correction amount corresponding to a magnetic field generated by driving the step motor from the detection amount of the magnetic sensor;
The stop control means stops driving the step motor based on a detection amount of the sensor from which the correction amount is subtracted by the offset means.

請求項９記載の発明は、
請求項１〜８の何れか１項に記載の指針駆動制御装置を備え、
前記指針は文字板上で回転して時刻を表示する秒針、分針または時針であることを特徴とするアナログ電子時計である。 The invention according to claim 9
The pointer drive control device according to any one of claims 1 to 8,
The hand is an analog electronic timepiece which is a second hand, a minute hand or an hour hand which rotates on a dial to display time.

請求項１０記載の発明は、請求項９記載のアナログ電子時計において、
前記停止制御手段による前記ステップモータの駆動停止中に、時間の経過を計数するカウンタ手段を備え、
前記補正制御手段は、前記ステップモータを前記カウンタ手段の計数値に前記回転量算出手段により求められた回転量を加減算したステップ数駆動して、前記指針の位置を補正することを特徴としている。 According to a tenth aspect of the present invention, in the analog electronic timepiece according to the ninth aspect,
A counter means for counting the passage of time during stoppage of driving of the step motor by the stop control means;
The correction control means drives the step motor by the number of steps obtained by adding or subtracting the rotation amount obtained by the rotation amount calculation means to the count value of the counter means, thereby correcting the position of the pointer.

本発明に従うと、ステップモータの駆動に影響するような磁界が及ぼされた場合に、運針が停止され、磁界の影響でステップモータが回転してしまった場合に回転量算出手段によりその回転量が算出され、補正制御手段によりこの回転量を考慮した補正処理が行われるので、磁界の影響による指針の位置ズレをより確実に防止できる。 According to the present invention, when a magnetic field that affects the driving of the step motor is applied, the movement of the hand is stopped, and when the step motor rotates due to the magnetic field, the rotation amount is calculated by the rotation amount calculation means. Since the correction processing is calculated and the correction control means takes this rotation amount into consideration, the displacement of the pointer due to the influence of the magnetic field can be prevented more reliably.

本発明の実施形態のアナログ電子時計の電気的な構成を示すブロック図である。It is a block diagram which shows the electric constitution of the analog electronic timepiece of embodiment of this invention. 実施形態のアナログ電子時計の内部機構を示す断面図である。It is sectional drawing which shows the internal mechanism of the analog electronic timepiece of embodiment. 秒針車の構成を示す平面図である。It is a top view which shows the structure of a second hand wheel. 受光部の構成を示す斜視図である。It is a perspective view which shows the structure of a light-receiving part. 秒針車の透過孔と受光部との配置関係を表わした説明図である。It is explanatory drawing showing the arrangement | positioning relationship between the permeation | transmission hole of a second hand wheel, and a light-receiving part. ＣＰＵにより実行される針ズレ回避処理の制御手順を示したフローチャートの第１部分である。It is the 1st part of the flowchart which showed the control procedure of the needle | hook deviation avoidance process performed by CPU. 同、針ズレ回避処理の制御手順を示したフローチャートの第２部分である。3 is a second part of a flowchart showing a control procedure of needle misalignment avoidance processing. 同、針ズレ回避処理の制御手順を示したフローチャートの第３部分である。4 is a third part of the flowchart showing the control procedure of the needle misalignment avoidance process. 秒針車が順方向に１ステップ回転する場合の受光部の検出パターンを示した説明図である。It is explanatory drawing which showed the detection pattern of the light-receiving part in case a second hand wheel rotates 1 step in the forward direction. 秒針車が逆方向に１ステップ回転する場合の受光部の検出パターンを示した説明図である。It is explanatory drawing which showed the detection pattern of the light-receiving part in case a second hand wheel rotates 1 step in the reverse direction. 本発明の第２実施形態のアナログ電子時計のステップモータと磁気センサとを示した平面図である。It is the top view which showed the step motor and magnetic sensor of the analog electronic timepiece of 2nd Embodiment of this invention. 第２実施形態のＣＰＵにより実行される磁界検出処理の制御手順を示すフローチャートである。It is a flowchart which shows the control procedure of the magnetic field detection process performed by CPU of 2nd Embodiment.

以下、本発明の実施の形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

［第１実施形態］
図１は、本発明の第１実施形態のアナログ電子時計１の電気的な構成を示すブロック図、図２は、アナログ電子時計１の内部機構を示すブロック図である。 [First Embodiment]
FIG. 1 is a block diagram showing an electrical configuration of an analog electronic timepiece 1 according to the first embodiment of the present invention, and FIG. 2 is a block diagram showing an internal mechanism of the analog electronic timepiece 1.

この第１実施形態のアナログ電子時計１は、図２に示すように、文字板１５の上で秒針１１、分針１２および時針１３が回転して時刻を表示するものである。秒針１１は秒針軸２６ａを介して回転体としての秒針車２５に固定的に連結され、分針１２は分針軸２６ｂを介して分針車２９に固定的に連結され、時針１３は時針軸２６ｃを介して時針車３０に固定的に連結されている。これら秒針車２５、分針車２９、時針車３０は、ともに円形状の歯車である In the analog electronic timepiece 1 of the first embodiment, as shown in FIG. 2, the second hand 11, the minute hand 12 and the hour hand 13 rotate on the dial 15 to display the time. The second hand 11 is fixedly connected to a second hand wheel 25 as a rotating body through a second hand shaft 26a, the minute hand 12 is fixedly connected to a minute hand wheel 29 through a minute hand shaft 26b, and the hour hand 13 is connected through an hour hand shaft 26c. The hour hand wheel 30 is fixedly connected. The second hand wheel 25, the minute hand wheel 29, and the hour hand wheel 30 are all circular gears.

アナログ電子時計１には、図１に示すように、秒針１１を駆動する第１ステップモータ４１と、時分針１２，１３を連動させて駆動する第２ステップモータ４２とが設けられている。図２に示すように、第１ステップモータ４１のロータ２１は、五番車２３を介して秒針車２５と連結されており、第１ステップモータ４１が６０ステップ回転することで秒針車２５および秒針１１が一周するようになっている。第２ステップモータ４２のロータ２２は、中間車２７と三番車２８とを介して分針車２９および時針車３０に連結され、第２ステップモータ４２が３６０ステップ回転することで分針車２９および分針１２が一周し、時針車３０および時針１３が３０°回転するようになっている。 As shown in FIG. 1, the analog electronic timepiece 1 is provided with a first step motor 41 for driving the second hand 11 and a second step motor 42 for driving the hour and minute hands 12 and 13 in conjunction with each other. As shown in FIG. 2, the rotor 21 of the first step motor 41 is connected to the second hand wheel 25 via the fifth wheel 23, and the second hand wheel 25 and the second hand are rotated by the first step motor 41 rotating 60 steps. 11 goes around. The rotor 22 of the second step motor 42 is connected to the minute hand wheel 29 and the hour hand wheel 30 via the intermediate wheel 27 and the third wheel 28, and the second step motor 42 rotates 360 steps to cause the minute hand wheel 29 and the minute hand to rotate. 12, the hour hand wheel 30 and the hour hand 13 are rotated by 30 °.

このアナログ電子時計１には、さらに、図１に示すように、装置の全体的な制御を行うＣＰＵ（中央演算処理装置）４５と、制御プログラムや制御データが格納されたＲＯＭ（Read Only Memory）４６と、ＣＰＵ４５に作業用のメモリ空間を提供するＲＡＭ（Random Access Memory）４７と、秒針車２５の回転を検出する検出部４３と、外部から及ぼされる磁界の大きさを検出する磁界検出手段としての磁気センサ５４と、各部に電源電圧を供給する電源部５１と、時刻コードを含んだ標準電波を受信するアンテナＡＮおよび検波回路５２と、計時用の周期信号（例えば１秒周期で出力される１秒信号）を生成する発振回路４８および分周回路４９と、時刻を計時する計時回路５０と、複数の操作ボタンを有する操作部５３とを備えている。上記ＣＰＵ４５により、ステップモータ４１，４２を駆動制御する駆動制御手段が構成される。また、ＣＰＵ４５、第１ステップモータ４１、検出部４３、磁気センサ５４、ＲＯＭ４６およびＲＡＭ４７により、指針駆動制御装置が構成される。 As shown in FIG. 1, the analog electronic timepiece 1 further includes a CPU (Central Processing Unit) 45 that performs overall control of the apparatus, and a ROM (Read Only Memory) that stores control programs and control data. 46, a RAM (Random Access Memory) 47 that provides a working memory space for the CPU 45, a detection unit 43 that detects the rotation of the second hand wheel 25, and a magnetic field detection means that detects the magnitude of the magnetic field exerted from the outside. Magnetic sensor 54, power supply 51 for supplying power to each unit, antenna AN and detection circuit 52 for receiving a standard radio wave including a time code, and a periodic signal for timing (for example, output at a cycle of 1 second) Oscillation circuit 48 and frequency dividing circuit 49 for generating a 1 second signal), a time measuring circuit 50 for measuring time, and an operation unit 53 having a plurality of operation buttons. The CPU 45 constitutes drive control means for driving and controlling the step motors 41 and 42. In addition, the CPU 45, the first step motor 41, the detection unit 43, the magnetic sensor 54, the ROM 46, and the RAM 47 constitute a pointer drive control device.

図３には秒針車２５の構成を示す平面図を、図４には検出部４３の受光部５，６の構成を示す斜視図を、図５には秒針車２５の透過孔２５ａと受光部５，６の配置関係を表わした説明図を、それぞれ示す。 3 is a plan view showing the structure of the second hand wheel 25, FIG. 4 is a perspective view showing the structure of the light receiving parts 5 and 6 of the detection unit 43, and FIG. 5 shows the transmission hole 25a of the second hand wheel 25 and the light receiving part. The explanatory views showing the arrangement relationship of 5 and 6 are respectively shown.

秒針車２５には、図３に示すように、その周囲に回転方向に並んで複数の透過孔２５ａ，２５ａ…が形成されている。透過孔２５ａは光を透過し、その他の部分は光を遮断する。透過孔２５ａは、秒針車２５の同一半径の位置に回転方向に等間隔に並んで６０個形成されている。隣接する２個の透過孔２５ａの間隔（中心から中心までの間隔）は、第１ステップモータ４１の１ステップの回転に対応する秒針車２５の回転角度（６°）に対応している。 As shown in FIG. 3, the second hand wheel 25 has a plurality of transmission holes 25a, 25a,. The transmission hole 25a transmits light, and the other portions block light. Sixty transmission holes 25a are formed in the same radius of the second hand wheel 25 at regular intervals in the rotational direction. The interval between the two adjacent transmission holes 25a (interval from the center to the center) corresponds to the rotation angle (6 °) of the second hand wheel 25 corresponding to one step rotation of the first step motor 41.

検出部４３（図１）は、１つの発光部４と、２つの受光部５，６とを備えている。発光部４は、例えば発光ダイオードなどからなり、図２に示すように、秒針車２５に対向する支持板３４に固定されている。この発光部４は、秒針車２５の透過孔２５ａが形成される半径位置で、且つ、第１ステップモータ４１のロータ２１がステップ停止位置にあるときに透過孔２５ａが停止する回転方向位置に配置され、秒針車２５の板面に対して直交方向に光を照射する。 The detection unit 43 (FIG. 1) includes one light emitting unit 4 and two light receiving units 5 and 6. The light emitting unit 4 is made of, for example, a light emitting diode, and is fixed to a support plate 34 facing the second hand wheel 25 as shown in FIG. The light emitting unit 4 is arranged at a radial position where the transmission hole 25a of the second hand wheel 25 is formed and at a rotational position where the transmission hole 25a stops when the rotor 21 of the first step motor 41 is at the step stop position. Then, light is irradiated in a direction orthogonal to the plate surface of the second hand wheel 25.

２つの受光部５，６は、図２に示すように、秒針車２５を挟んで発光部４と対向する位置で指示板３１上に固定されている。２つの受光部５，６は、図４と図５に示すように、各々の受光面５ａ，６ａが隣接し、且つ、これら受光面５ａ，６ａが透過孔２５ａの回転方向Ｚと対応する方向に並んで配置されている。また、図５に示すように、第１ステップモータ４１のロータ２２がステップ停止位置にあるときに、１つの透過孔２５ａが受光部５，６にまたがって、受光部５，６の中間位置に来るように、これら２個の受光部５，６が配置されている。 As shown in FIG. 2, the two light receiving portions 5 and 6 are fixed on the indicator plate 31 at positions facing the light emitting portion 4 with the second hand wheel 25 interposed therebetween. As shown in FIGS. 4 and 5, the two light receiving portions 5 and 6 are adjacent to each other, and the light receiving surfaces 5a and 6a correspond to the rotation direction Z of the transmission hole 25a. Are arranged side by side. Further, as shown in FIG. 5, when the rotor 22 of the first step motor 41 is in the step stop position, one transmission hole 25 a spans the light receiving portions 5 and 6 and is at an intermediate position between the light receiving portions 5 and 6. These two light receiving portions 5 and 6 are arranged so as to come.

また、受光部５，６の間には、秒針車２５のある側に突出した遮光部材としての遮光板８が設けられている。この遮光板８が２個の受光面５ａ，６ａの間を仕切ることにより、透過孔２５ａのうち第１受光面５ａに重なった範囲を通過した光は、第１受光面５ａに多く入射し、第２受光面６ａには余り入射しないようにされる。逆に、透過孔２５ａのうち第２受光面６ａに重なった範囲を通過した光は、第２受光面６ａに多く入射し、第１受光面５ａには余り入射しないようにされる。 Further, a light shielding plate 8 is provided between the light receiving portions 5 and 6 as a light shielding member that protrudes to the side where the second hand wheel 25 is located. Since the light shielding plate 8 partitions the two light receiving surfaces 5a and 6a, a large amount of light that has passed through the range of the transmission hole 25a that overlaps the first light receiving surface 5a is incident on the first light receiving surface 5a. The second light receiving surface 6a is not so much incident. On the contrary, a large amount of light that has passed through the range of the transmission hole 25a that overlaps the second light receiving surface 6a is incident on the second light receiving surface 6a and is not so incident on the first light receiving surface 5a.

磁気センサ５４は、例えばホール素子や磁界インピーダンス素子などを利用して外部から及ぼされる磁界の大きさを電気信号に変換して出力するものである。この第１実施形態においては、磁気センサ５４はステップモータ４１，４２など磁界の発生する箇所から遠いところに配置されている。 The magnetic sensor 54 converts the magnitude of the magnetic field exerted from the outside using, for example, a Hall element or a magnetic field impedance element and outputs the electric signal. In the first embodiment, the magnetic sensor 54 is disposed at a position far from a place where a magnetic field is generated, such as the step motors 41 and 42.

ＲＯＭ４６に格納された制御プログラムの中には、分周回路４９から入力される１秒信号や計時回路５０の計時データに基づいて指針１１〜１３を運針させて時刻を表示する時刻表示処理のプログラムや、運針動作に影響が生じるような過大な外部磁界が及ぼされた場合に指針１１〜１３の位置ズレを回避するために行う針ズレ回避処理のプログラムなどが含まれている。 Among the control programs stored in the ROM 46, a program for time display processing for displaying the time by moving the hands 11-13 based on the 1 second signal input from the frequency dividing circuit 49 and the time measuring data of the time measuring circuit 50 In addition, a program for avoiding misalignment of the needles 11 to 13 when an excessive external magnetic field that affects the hand movement operation is applied is included.

ＣＰＵ４５は、通常時は、上記の時刻表示処理を実行して、分周回路４９から供給される１秒信号に基づき第１ステップモータ４１に駆動パルスを出力して秒針１１をステップ駆動したり、１秒信号が１０回供給されるごとに第２ステップモータ４２に駆動パルスを出力して時分針１２，１３を駆動したりして、これら時分針１２，１３および秒針１１により文字板１５上に時刻を表示する。 The CPU 45 normally performs the time display process described above, and outputs a drive pulse to the first step motor 41 based on the 1 second signal supplied from the frequency dividing circuit 49 to step drive the second hand 11. Each time the 1-second signal is supplied 10 times, a drive pulse is output to the second step motor 42 to drive the hour / minute hands 12 and 13, and the hour / minute hands 12 and 13 and the second hand 11 are placed on the dial 15. Display the time.

また、ＣＰＵ４５は、指針１１〜１３の運針動作を乱すような外部磁界が及ぼされた場合に、上記の針ズレ回避処理を実行することで、次のようにして、外部磁界による指針１１〜１３の位置ズレを防止するようになっている。 Further, the CPU 45 executes the above-described needle misalignment avoiding process when an external magnetic field that disturbs the hand movement operation of the hands 11 to 13 is exerted, whereby the hands 11 to 13 using the external magnetic field are performed as follows. It is designed to prevent misalignment.

［針ズレ回避処理］
先ず、針ズレ回避処理の概要を説明する。針ズレ回避処理は、磁気センサ５４により運針動作が乱されるような過大レベルの磁界が検出された場合に、ＣＰＵ４５により実行される。針ズレ回避処理が開始されると、先ず、ＣＰＵ４５は、指針１１〜１３の不測の挙動を避けるため、通常の時刻表示処理による運針を停止させる。そして、この運針停止の期間に指針１１〜１３が回転するはずのステップ数のカウントを開始する。この実施形態では、時間に伴って指針１１〜１３が回転するので、運針停止からの経過時間をカウンタ手段としてのカウンタＢＴによってカウントし始める。 [Needle misalignment avoidance]
First, an outline of the needle misalignment avoidance process will be described. The needle misalignment avoiding process is executed by the CPU 45 when an excessive level magnetic field that disturbs the hand movement operation is detected by the magnetic sensor 54. When the hand misalignment avoidance process is started, first, the CPU 45 stops the hand movement by the normal time display process in order to avoid the unexpected behavior of the hands 11 to 13. Then, the counting of the number of steps at which the hands 11 to 13 should rotate during the period in which the hand movement is stopped is started. In this embodiment, since the hands 11 to 13 are rotated with time, the elapsed time from the stop of the hand movement is started to be counted by the counter BT as a counter means.

続いて、磁気センサ５４の出力を監視しながら過大レベルの磁界の検出が続く場合に、検出部４３の発光部４および第１と第２受光部５，６の駆動により、停止させている秒針１１が外部磁界の影響で回転しないか秒針車２５の透過孔２５ａを検出することで監視する。さらに、この秒針車２５の回転監視中、秒針車２５の回転が検出されたら、順方向の回転と逆方向の回転とを分けて、それら回転のステップ数をカウントする。ここで、秒針１１のみ回転監視を行うのは、第１ステップモータ４１のロータ２１から秒針車２５までのギヤ比が大きく、外部磁界の影響で一番回転しやすいのが秒針１１だからである。 Subsequently, when the detection of an excessive level magnetic field continues while monitoring the output of the magnetic sensor 54, the second hand is stopped by driving the light emitting unit 4 and the first and second light receiving units 5 and 6 of the detecting unit 43. 11 is monitored by detecting the transmission hole 25a of the second hand wheel 25 to see if it rotates due to the influence of an external magnetic field. Further, when the rotation of the second hand wheel 25 is detected during the rotation monitoring of the second hand wheel 25, the forward rotation and the reverse rotation are divided and the number of steps of the rotation is counted. Here, only the second hand 11 is monitored for rotation because the gear ratio from the rotor 21 of the first step motor 41 to the second hand wheel 25 is large and the second hand 11 is most easily rotated by the influence of an external magnetic field.

そして、このような外部磁界の監視と、秒針車２５の回転監視とを繰り返している間に、過大レベルの外部磁界が検出されなくなったら、指針１１〜１３を正常な位置に戻して運針を再開させる補正制御処理を行う。すなわち、停止期間中の経過時間を表わすカウンタＢＴのカウント値に基づいて、停止期間中に進んでいたはずの秒針１１や分針１２のステップ数を求め、さらに、運針停止の期間中に秒針車２５が回転していれば、そのカウント値を加減算して、秒針１１や分針１２の回転補正量を求める。そして、この回転補正量分だけ第１ステップモータ４１や第２ステップモータ４２を駆動させて指針１１〜１３を早送りする。 If an excessive level of external magnetic field is not detected while monitoring the external magnetic field and monitoring the rotation of the second hand wheel 25, the hands 11 to 13 are returned to the normal positions and the hand movement is resumed. A correction control process is performed. That is, based on the count value of the counter BT representing the elapsed time during the stop period, the number of steps of the second hand 11 and the minute hand 12 that should have progressed during the stop period is obtained. Is rotated, the count value is added or subtracted to determine the rotation correction amount of the second hand 11 or the minute hand 12. Then, the first step motor 41 and the second step motor 42 are driven by the rotation correction amount to fast-forward the hands 11 to 13.

このような補正制御処理により、指針１１〜１３が現在時刻を表わす正常な位置に戻ることとなる。そして、通常の時刻表示処理の運針を再開することで、指針１１〜１３の位置ズレがない状態で通常の運針動作が再開されることとなる。 By such correction control processing, the hands 11 to 13 are returned to the normal position representing the current time. Then, by restarting the normal time display processing, the normal hand movement operation is resumed in a state in which the hands 11 to 13 are not misaligned.

次に、上記の針ズレ回避処理について詳細な制御手順を説明する。 Next, a detailed control procedure for the needle misalignment avoidance process will be described.

図６〜図８には、ＣＰＵ４５により実行される針ズレ回避処理のフローチャートを、図９には、秒針車２５が順方向に１ステップ回転する場合の受光部５，６の検出パターンを表わした説明図を、図１０には、秒針車２５が逆方向に１ステップ回転する場合の受光部５，６の検出パターンを表わした説明図を示す。 FIGS. 6 to 8 show flowcharts of the needle misalignment avoidance process executed by the CPU 45, and FIG. 9 shows detection patterns of the light receiving units 5 and 6 when the second hand wheel 25 rotates one step in the forward direction. FIG. 10 is an explanatory diagram showing detection patterns of the light receiving portions 5 and 6 when the second hand wheel 25 rotates one step in the reverse direction.

針ズレ回避処理は、磁気センサ５４により運針動作が乱されるような過大レベルの磁界が検出された場合に、この磁気センサ５４からの検出信号に基づいてＣＰＵ４５により開始される。 The needle misalignment avoidance process is started by the CPU 45 based on a detection signal from the magnetic sensor 54 when an excessive level magnetic field that disturbs the hand movement operation is detected by the magnetic sensor 54.

針ズレ回避処理が開始されると、まず、ＣＰＵ４５は、時刻表示処理の運針処理を停止し（ステップＳ１：停止制御手段）、この運針停止中の経過時間を計数するためにカウンタＢＴのカウント処理をスタートさせる（ステップＳ２）。さらに、運針停止中に検出部４３により秒針車２５の回転検出を行うために、検出部４３の発光部４を発光状態とする（ステップＳ３：発光制御手段）。 When the hand misalignment avoidance process is started, first, the CPU 45 stops the hand movement process of the time display process (step S1: stop control means), and counts the counter BT to count the elapsed time during the stop of the hand movement. Is started (step S2). Furthermore, in order to detect the rotation of the second hand wheel 25 by the detection unit 43 while the hand movement is stopped, the light emitting unit 4 of the detection unit 43 is set in a light emission state (step S3: light emission control means).

次いで、ＣＰＵ４５は、過大レベルの磁界がなくなるまで繰り返し実行されるループ処理（ステップＳ４〜Ｓ８，Ｓ１３〜Ｓ３１）に移行する。ループ処理では、先ず、磁気センサ５４の出力信号を取り込み（ステップＳ４）、過大レベルか否かを判別するための閾値と比較するなどして検出された外部磁界が過大レベルであるか否かを判別する（ステップＳ５）。そして、外部磁界が過大レベルのままであれば、第１と第２の受光部５，６を作動させて光の検出を行う（ステップＳ６）。 Next, the CPU 45 proceeds to a loop process (steps S4 to S8, S13 to S31) that is repeatedly executed until there is no excessive level of magnetic field. In the loop processing, first, an output signal of the magnetic sensor 54 is captured (step S4), and compared with a threshold value for determining whether or not it is an excessive level, it is determined whether or not the external magnetic field detected is an excessive level. A determination is made (step S5). If the external magnetic field remains at an excessive level, the first and second light receiving portions 5 and 6 are activated to detect light (step S6).

ここで、図９（ａ）や図１０（ａ）に示すように、秒針車２５が通常のステップ停止位置にあれば、透過孔２５ａが２つの受光部５，６をまたいだ配置となるので、第１受光部５がオン（発光部４の光の受光あり）、第２受光部６がオン（発光部４の光の受光あり）となる。 Here, as shown in FIGS. 9A and 10A, if the second hand wheel 25 is at the normal step stop position, the transmission hole 25a is disposed across the two light receiving portions 5 and 6. The first light receiving unit 5 is turned on (the light from the light emitting unit 4 is received), and the second light receiving unit 6 is turned on (the light from the light emitting unit 4 is received).

一方、図９（ｂ）や図１０（ｂ）に示すように、外部磁界の影響で秒針１１やロータ２１に外力が作用すると、透過孔２５ａの位置が順方向または逆方向に少しずれて、図９（ｂ）の状態であれば第１受光部５がオフ、第２受光部６がオンと変化するし、図１０（ｂ）の状態であれば第１受光部５がオン、第２受光部６がオフと変化する。 On the other hand, as shown in FIGS. 9B and 10B, when an external force acts on the second hand 11 or the rotor 21 due to the influence of the external magnetic field, the position of the transmission hole 25a is slightly shifted in the forward direction or the reverse direction, In the state of FIG. 9B, the first light receiving unit 5 is turned off and the second light receiving unit 6 is turned on. In the state of FIG. 10B, the first light receiving unit 5 is turned on and the second light receiving unit 6 is turned on. The light receiving unit 6 changes to OFF.

したがって、ステップＳ６で光の検出を行ったら、先ず、透過孔２５ａがステップ停止位置にある状態Ａであるか否かを判別する（ステップＳ７）。すなわち、第１受光部５がオンで第２受光部６がオンであるか判別する。その結果、状態Ａである判別されれば、秒針車２５が回転し始めていないと判断してステップＳ４に戻る。そして、ステップＳ４〜Ｓ７のループ処理を繰り返す。 Therefore, when light is detected in step S6, it is first determined whether or not the transmission hole 25a is in the state A at the step stop position (step S7). That is, it is determined whether the first light receiving unit 5 is on and the second light receiving unit 6 is on. As a result, if it is determined that the state is A, it is determined that the second hand wheel 25 has not started rotating, and the process returns to step S4. Then, the loop process of steps S4 to S7 is repeated.

一方、ステップＳ７の判別で状態Ａ（図９，図１０参照）でないと判別されたら、秒針車２５が回転し始めていると判断して、何れの方向に回転し始めているのか判断するために、ステップＳ６の光検出の結果が第１受光部５がオフで第２受光部６がオンか否かを判別する（ステップＳ８）。 On the other hand, if it is determined in step S7 that the state is not state A (see FIGS. 9 and 10), it is determined that the second hand wheel 25 is starting to rotate, and in which direction the rotation is starting. As a result of the light detection in step S6, it is determined whether or not the first light receiving unit 5 is off and the second light receiving unit 6 is on (step S8).

そして、ステップＳ８で第１受光部５がオフで第２受光部６がオンであると判別されれば、図９（ｂ）に示すように順方向に回転し始めたと判断して、図７のステップＳ１３へ移行するし、ステップＳ８の判別結果がＮＯであれば、図１０（ｂ）に示すように逆方向に回転し始めたと判断して、図８のステップＳ２２に移行する。 If it is determined in step S8 that the first light receiving unit 5 is off and the second light receiving unit 6 is on, it is determined that rotation has started in the forward direction as shown in FIG. If the determination result in step S8 is NO, it is determined that rotation has started in the reverse direction as shown in FIG. 10B, and the process moves to step S22 in FIG.

順方向に回転し始めたと判断して、ステップＳ１３に移行したら、続いて、そのまま秒針車２５が順方向に進んで１ステップ分回転してしまうか、或いは、回転途中で元に戻るか等の判別を行っていく。すなわち、先ず、受光部５，６で光の検出を行い（ステップＳ１３）、この検出の結果、第１受光部５がオフで第２受光部６がオン（状態Ｂ）であるか判別し（ステップＳ１４）、状態Ｂでなければ第１受光部がオンで第２受光部６がオフ（状態Ｃ）であるか判別し（ステップＳ１５）、状態Ｂでも状態Ｃでもなければ第１受光部５がオンで第２受光部６がオン（図９（ａ）の状態Ａ）であるか判別する（ステップＳ２１）。 If it is determined that the rotation has started in the forward direction and the process proceeds to step S13, then, whether the second hand wheel 25 advances in the forward direction and rotates by one step, or whether it returns to the middle during the rotation, etc. Discriminate. That is, first, light detection is performed by the light receiving units 5 and 6 (step S13), and it is determined as a result of this detection whether the first light receiving unit 5 is off and the second light receiving unit 6 is on (state B) ( In step S14), if the state is not state B, it is determined whether the first light receiving unit is on and the second light receiving unit 6 is off (state C) (step S15). Is on and the second light receiving unit 6 is on (state A in FIG. 9A) (step S21).

その結果、ステップＳ１４で状態Ｂ（図９参照）であると判別されれば、秒針車２５が順方向へ回転し始めた状態のまま変化していないと判断してステップＳ１３に戻る。一方、ステップＳ１５で状態Ｃと判別されれば、秒針車２５が順方向へさらに半歩進んだと判断してステップＳ１６に移行する。また、ステップＳ２１で状態Ａと判別されれば、回転しかけた秒針車２５が元の停止位置に戻ったと判断してステップＳ４に戻る。他方、ステップＳ２１で状態Ａと判別されなければ、ステップＳ１３の光検出の結果が状態Ａ〜Ｃの何れにも該当せず異常であると判断してエラー終了する。 As a result, if it is determined in step S14 that the state is the state B (see FIG. 9), it is determined that the second hand wheel 25 has not changed in the state in which it has started rotating in the forward direction, and the process returns to step S13. On the other hand, if it is determined in step S15 that the state is C, it is determined that the second hand wheel 25 has further advanced half a step in the forward direction, and the process proceeds to step S16. If it is determined that the state is A in step S21, it is determined that the rotating second hand wheel 25 has returned to the original stop position, and the process returns to step S4. On the other hand, if it is not determined that the state is A in step S21, it is determined that the result of the light detection in step S13 does not correspond to any of the states A to C, and the process ends with an error.

秒針車２５の回転がさらに半歩進んで状態Ｃになったと判断されてステップＳ１６に移行したら、同様に、先ず、受光部５，６で光の検出を行い（ステップＳ１６）、この検出の結果、第１受光部５がオンで第２受光部６がオフ（状態Ｃ）であるか判別し（ステップＳ１７）、状態Ｃでなければ第１受光部５がオフで第２受光部６がオン（状態Ｂ）であるか判別し（ステップＳ１８）、状態Ｃでも状態Ｂでもなければ第１受光部５がオンで第２受光部６がオン（状態Ａ）であるか判別する（ステップＳ１９）。 If it is determined that the rotation of the second hand wheel 25 has further advanced half a step and the state C is reached and the process proceeds to step S16, similarly, first, light detection is performed by the light receiving units 5 and 6 (step S16). Then, it is determined whether the first light receiving unit 5 is on and the second light receiving unit 6 is off (state C) (step S17). If not, the first light receiving unit 5 is off and the second light receiving unit 6 is on. It is determined whether or not (state B) (step S18). If neither state C nor state B, it is determined whether or not the first light receiving unit 5 is on and the second light receiving unit 6 is on (state A) (step S19). .

その結果、ステップＳ１７で状態Ｃと判別されれば、秒針車２５の状態変化なしと判断してステップＳ１６に戻る。一方、ステップＳ１８で状態Ｂと判別されれば、秒針車２５が逆方向に半歩戻って状態Ｂになったと判断してステップＳ１３に戻る。また、ステップＳ１９で状態Ａと判別されれば、秒針車２５が図９（ａ）〜（ｄ）に示すように１ステップ分回転したと判断して、順方向の回転ステップ数をカウントする変数Ｘをカウントアップする（ステップＳ２０）。そして、ステップＳ４に戻る。他方、ステップＳ１９で状態Ａとも判別されなければ、ステップＳ１６の光検出の結果が状態Ａ〜Ｃの何れにも該当せず異常であると判断してエラー終了する。 As a result, if it is determined that the state is C in step S17, it is determined that there is no change in the state of the second hand wheel 25, and the process returns to step S16. On the other hand, if it is determined that the state is B in step S18, it is determined that the second hand wheel 25 has returned to the state B by half a step in the reverse direction, and the process returns to step S13. If it is determined in step S19 that the state is A, it is determined that the second hand wheel 25 has rotated one step as shown in FIGS. 9A to 9D, and a variable for counting the number of forward rotation steps. X is counted up (step S20). Then, the process returns to step S4. On the other hand, if neither the state A nor the state A is determined in step S19, it is determined that the result of the light detection in step S16 does not correspond to any of the states A to C, and the process ends with an error.

上記のステップＳ１３〜Ｓ２１の処理により、秒針車２５が順方向に回転し始めたときに、そのまま１ステップ分回転したか、回転せずに元に戻るか等の検出が行われて、順方向に１ステップ分回転したときには、その回転ステップ数が変数Ｘにカウントされていく。このステップＳ１３〜Ｓ２１の処理により回転量算出手段が構成される。 When the second hand wheel 25 starts to rotate in the forward direction by the processes in steps S13 to S21, it is detected whether the second hand wheel 25 has been rotated by one step as it is or returned to the original without rotating, and the forward direction is detected. In this case, the number of rotation steps is counted in the variable X. A rotation amount calculation unit is configured by the processes of steps S13 to S21.

一方、ステップＳ８の判別処理の結果、秒針車２５の回転し始めの状態が順方向の回転でないと判断されてステップＳ２２（図８）に移行したら、当該ステップで、先ず、図１０（ｂ）に示す状態Ｄにあるか否かを判別する。すなわち、第１受光部５がオンで第２受光部がオフであるかを判別する（ステップＳ２２）。その結果、状態Ｄであると判別されれば、ステップＳ２３に移行する。一方、状態Ｄでないと判別されなければ、ステップＳ６の光検出の結果が状態Ａ，Ｂ，Ｄの何れにも該当せず異常であると判断してエラー終了する。 On the other hand, as a result of the determination process in step S8, when it is determined that the state in which the second hand wheel 25 starts to rotate is not forward rotation, and the process proceeds to step S22 (FIG. 8), in this step, first, FIG. It is determined whether or not it is in the state D shown in FIG. That is, it is determined whether the first light receiving unit 5 is on and the second light receiving unit is off (step S22). As a result, if it is determined that the state is D, the process proceeds to step S23. On the other hand, if it is not determined that the state is not the state D, it is determined that the result of the light detection in step S6 does not correspond to any of the states A, B, and D, and the process ends with an error.

逆方向に回転し始めたと判断して、ステップＳ２３に移行したら、先ず、受光部５，６で光の検出を行い（ステップＳ２３）、この検出の結果、第１受光部５がオンで第２受光部６がオフ（状態Ｄ）であるか判別し（ステップＳ２４）、状態Ｄでなければ第１受光部がオフで第２受光部６がオン（状態Ｅ）であるか判別し（ステップＳ２５）、状態Ｄでも状態Ｅでもなければ第１受光部５がオンで第２受光部６がオン（図１０（ａ）の状態Ａ）であるか判別する（ステップＳ３１）。 When it is determined that rotation has started in the reverse direction and the process proceeds to step S23, first, light detection is performed by the light receiving units 5 and 6 (step S23). As a result of this detection, the first light receiving unit 5 is turned on and the second light receiving unit 5 is turned on. It is determined whether or not the light receiving unit 6 is off (state D) (step S24). If it is not state D, it is determined whether the first light receiving unit 6 is off and the second light receiving unit 6 is on (state E) (step S25). ), If it is neither state D nor state E, it is determined whether the first light receiving unit 5 is on and the second light receiving unit 6 is on (state A in FIG. 10A) (step S31).

その結果、ステップＳ２４で状態Ｄであると判別されれば、秒針車２５が逆方向へ回転し始めた状態のまま変化していないと判断してステップＳ２３に戻る。一方、ステップＳ２５で状態Ｅと判別されれば、秒針車２５が逆方向へさらに半歩進んだと判断してステップＳ２６に移行する。また、ステップＳ３１で状態Ａと判別されれば、回転しかけた秒針車２５が元の停止位置に戻ったと判断してステップＳ４に戻る。他方、ステップＳ３１で状態Ａとも判別されなければ、ステップＳ２３の光検出の結果が状態Ａ，Ｄ，Ｅの何れにも該当せず異常であると判断してエラー終了する。 As a result, if it is determined in step S24 that the state is the state D, it is determined that the second hand wheel 25 has not changed in a state where it has started rotating in the reverse direction, and the process returns to step S23. On the other hand, if it is determined in step S25 that the state is E, it is determined that the second hand wheel 25 has further advanced half a step in the reverse direction, and the process proceeds to step S26. If it is determined that the state is A in step S31, it is determined that the rotated second hand wheel 25 has returned to the original stop position, and the process returns to step S4. On the other hand, if neither state A is determined in step S31, it is determined that the result of light detection in step S23 does not correspond to any of states A, D, and E, and the process ends with an error.

秒針車２５の回転がさらに半歩進んで状態Ｅになったと判断されてステップＳ２６に移行したら、同様に、先ず、受光部５，６で光の検出を行い（ステップＳ２６）、この検出の結果、第１受光部５がオフで第２受光部６がオン（状態Ｅ）であるか判別し（ステップＳ２７）、状態Ｅでなければ第１受光部５がオンで第２受光部６がオフ（状態Ｄ）であるか判別し（ステップＳ２８）、状態Ｅでも状態Ｄでもなければ第１受光部５がオンで第２受光部６がオン（図１０（ｄ）の状態Ａ）であるか判別する（ステップＳ２９）。 When it is determined that the rotation of the second hand wheel 25 has further advanced half a step to reach the state E and the process proceeds to step S26, similarly, first, light detection is performed by the light receiving units 5 and 6 (step S26). Then, it is determined whether the first light receiving unit 5 is off and the second light receiving unit 6 is on (state E) (step S27). If not, the first light receiving unit 5 is on and the second light receiving unit 6 is off. It is determined whether or not (state D) (step S28). If neither state E nor state D, the first light receiving unit 5 is on and the second light receiving unit 6 is on (state A in FIG. 10 (d)). It discriminate | determines (step S29).

その結果、ステップＳ２７で状態Ｅと判別されれば、秒針車２５の状態変化なしと判断してステップＳ２６に戻る。一方、ステップＳ２８で状態Ｄと判別されれば、秒針車２５が順方向に半歩戻って状態Ｅから状態Ｄになったと判断してステップＳ２３に戻る。また、ステップＳ２９で状態Ａと判別されれば、秒針車２５が図１０（ａ）〜（ｄ）に示すように１ステップ分逆回転したと判断して、逆方向の回転ステップ数をカウントする変数Ｙをカウントアップする（ステップＳ３０）。そして、ステップＳ４に戻る。他方、ステップＳ２９で状態Ａと判別されなければ、ステップＳ２６の光検出の結果が状態Ａ，Ｄ，Ｅの何れにも該当せず異常であると判断してエラー終了する。 As a result, if it is determined that the state is E in step S27, it is determined that the state of the second hand wheel 25 has not changed, and the process returns to step S26. On the other hand, if it is determined that the state is D in step S28, it is determined that the second hand wheel 25 has returned half a step in the forward direction from the state E to the state D, and the process returns to step S23. If it is determined in step S29 that the state is A, it is determined that the second hand wheel 25 has rotated backward by one step as shown in FIGS. 10A to 10D, and the number of rotation steps in the reverse direction is counted. The variable Y is counted up (step S30). Then, the process returns to step S4. On the other hand, if it is not determined that the state is A in step S29, it is determined that the result of the light detection in step S26 does not correspond to any of the states A, D, and E, and the process ends with an error.

上記のステップＳ２２〜Ｓ３１の処理により、秒針車２５が逆方向に回転し始めたときに、そのまま１ステップ分回転したか、回転せずに元に戻るか等の検出が行われて、１ステップ分逆回転したときには、その逆方向の回転ステップ数が変数Ｙにカウントされていく。このステップＳ２２〜Ｓ３１の処理により回転量算出手段が構成される。 When the second hand wheel 25 starts to rotate in the reverse direction by the processing of steps S22 to S31, it is detected whether the second hand wheel 25 has been rotated by one step as it is or returned to its original state without rotating. When the reverse rotation is made, the number of rotation steps in the reverse direction is counted in the variable Y. A rotation amount calculation unit is configured by the processes in steps S22 to S31.

そして、ステップＳ４〜Ｓ８（図６），Ｓ１３〜Ｓ３１（図７，図８）のループ処理を繰り返すことで、外部磁界が過大レベルである期間に、外部磁界の影響で秒針車２５が順方向や逆方向に何ステップも回転した場合には、それらが変数Ｘ，Ｙにカウントされていく。さらに、このループ処理中、外部磁界が過大レベルを下回ったら、ステップＳ５の判別処理でＮＯ側に分岐されて、このループ処理を抜ける。 Then, by repeating the loop processing of steps S4 to S8 (FIG. 6) and S13 to S31 (FIGS. 7 and 8), the second hand wheel 25 is moved forward due to the influence of the external magnetic field during a period in which the external magnetic field is excessive. When many steps are rotated in the opposite direction, they are counted in the variables X and Y. Further, if the external magnetic field falls below an excessive level during this loop process, the process branches to the NO side in the determination process of step S5 and exits from this loop process.

そして、このループ処理を抜けたら、ＣＰＵ４５は、運針停止中の経過時間を計数しているカウンタＢＴを停止させ（ステップＳ９）、ステップＳ３で発光状態にした発光部４を消灯させる（ステップＳ１０）。さらに、カウンタＢＴの計数値に、運針停止中に回転ステップ数をカウントした変数Ｘ，Ｙの値を加減算（順方向の回転ステップ数を格納した変数Ｘの値は減算、逆方向の回転ステップ数を格納した変数Ｙの値は加算）してステップ数を求め、このステップ数分、秒針１１を早送りする（ステップＳ１１：補正制御手段）。また、カウンタＢＴ分のステップ数分、分針１２と時針１３を早送りする。そして、時刻表示処理による通常の運針処理を再開させる（ステップＳ１２）。そして、この針ズレ回避処理を終了する。 Then, after exiting this loop processing, the CPU 45 stops the counter BT counting the elapsed time during the stop of the hand movement (step S9), and turns off the light emitting unit 4 which has been turned on in step S3 (step S10). . Further, the count value of the counter BT is added to or subtracted from the values of the variables X and Y obtained by counting the number of rotation steps while the hand movement is stopped. Is added to the value of the variable Y, and the number of steps is obtained, and the second hand 11 is fast-forwarded by the number of steps (step S11: correction control means). Further, the minute hand 12 and the hour hand 13 are fast-forwarded by the number of steps corresponding to the counter BT. Then, the normal hand movement process by the time display process is resumed (step S12). Then, the needle misalignment avoidance process is terminated.

以上のように、この実施形態のアナログ電子時計１によれば、針ズレ回避処理によって、過大な外部磁界が及ぼされた場合に、これを検知して運針を停止するとともに、運針の停止中に外部磁界の影響により秒針車２５が回転してしまっても、この回転を検出するとともにその回転量がカウントされる。したがって、過大な外部磁界がなくなって運針処理を再開する際に、指針１１〜１３の位置を正しい位置に移動させてから運針を再開することができる。すなわち、針ズレの原因となる過大な外部磁界が及ぼされた場合でも、針ズレを防止して針ズレのない正確な時間を表示しつづけることができる。 As described above, according to the analog electronic timepiece 1 of this embodiment, when an excessive external magnetic field is exerted by the hand misalignment avoiding process, this is detected and the hand movement is stopped, while the hand movement is stopped. Even if the second hand wheel 25 rotates due to the influence of the external magnetic field, this rotation is detected and the amount of rotation is counted. Therefore, when the excessive external magnetic field disappears and the hand movement process is resumed, the hand movement can be resumed after the positions of the hands 11 to 13 are moved to the correct positions. That is, even when an excessive external magnetic field that causes needle misalignment is applied, needle misalignment can be prevented and an accurate time without needle misalignment can be continuously displayed.

また、この実施形態のアナログ電子時計１によれば、秒針車２５に第１ステップモータ４１の１ステップの回転に対応する回転角度ごとに１個の透過孔２５ａが形成されているので、２個の受光部５，６を用いて比較的に単純で負荷の少ない制御処理によって、秒針車２５の回転の向きと回転量を求めることができる。 Further, according to the analog electronic timepiece 1 of this embodiment, since one transmission hole 25a is formed in the second hand wheel 25 for each rotation angle corresponding to one step rotation of the first step motor 41, there are two The rotation direction and amount of rotation of the second hand wheel 25 can be obtained by a control process that is relatively simple and has a low load using the light receiving portions 5 and 6.

また、この実施の形態のアナログ電子時計１によれば、秒針１１の位置ズレを検出するために秒針１１と固定的に連結された秒針車２５に透過孔２５ａを設け、検出部４３によりこの秒針車２５の透過孔２５ａを検出する構成としたので、秒針１１の１ステップの回転に対応する透過孔２５ａの移動量を大きくとることができて、その回転の向きや回転量を正確に求められるようになっている。 In addition, according to the analog electronic timepiece 1 of this embodiment, the second hand wheel 25 fixedly connected to the second hand 11 is provided with the transmission hole 25a in order to detect the positional displacement of the second hand 11, and the second hand is detected by the detection unit 43. Since the transmission hole 25a of the wheel 25 is detected, the movement amount of the transmission hole 25a corresponding to the one-step rotation of the second hand 11 can be increased, and the rotation direction and the rotation amount can be accurately obtained. It is like that.

また、この実施形態のアナログ電子時計１によれば、針ズレ回避処理が、磁気センサ５４が所定レベルを超えた外部磁界を検出したことで実行されるようになっているので、針ズレの影響がほとんどないレベルの磁界が及ぼされた場合には、無駄に針ズレ回避処理が行われず、針ズレの影響が生じるレベルの磁界が及ぼされた場合のみ、有効に針ズレ回避処理を実行することができる。 Further, according to the analog electronic timepiece 1 of this embodiment, the hand misalignment avoiding process is executed when the magnetic sensor 54 detects an external magnetic field exceeding a predetermined level, and therefore the influence of the hand misalignment. When a magnetic field with almost no level is exerted, needle misalignment avoidance processing is not performed unnecessarily, and needle misalignment avoidance processing is executed effectively only when a magnetic field at a level causing needle misalignment is exerted. Can do.

また、針ズレ回避処理においては、第１受光部５と第２受光部６の検出結果が、図９（ａ）〜（ｄ）や、図１０（ａ）〜（ｄ）のように変化した場合を判別して、回転方向と１ステップ分回転したことを判断するので、比較的単純で負荷の少ない処理により正確な検出が可能になっている。 In the needle misalignment avoiding process, the detection results of the first light receiving unit 5 and the second light receiving unit 6 have changed as shown in FIGS. 9A to 9D and FIGS. 10A to 10D. Since the case is discriminated and it is determined that the rotation has been rotated by one step in the rotation direction, accurate detection is possible by a relatively simple process with a small load.

［第２実施形態］
図１１には、本発明の第２実施形態のアナログ電子時計のステップモータと磁気センサとを表わした平面図を示す。図１２には、第２実施形態の磁界検出処理のフローチャートを示す。 [Second Embodiment]
FIG. 11 is a plan view showing a step motor and a magnetic sensor of an analog electronic timepiece according to the second embodiment of the present invention. In FIG. 12, the flowchart of the magnetic field detection process of 2nd Embodiment is shown.

第２実施形態は、外部磁界を検出する磁気センサ５４Ｂを、第２ステップモータ４２の回転検知用の磁気センサと兼用したものである。第２ステップモータ４２は、図１１に示すように、２極に磁化されたロータ２２と、コイル３６に電流を流すことでロータ２２の周囲に磁界を発生させるステータ３７と、ロータ２２の回転を検出するためにロータ２２の磁極の向きを検出する磁気センサ５４Ｂとを備えている。 In the second embodiment, a magnetic sensor 54B that detects an external magnetic field is also used as a magnetic sensor for detecting the rotation of the second step motor 42. As shown in FIG. 11, the second step motor 42 includes a rotor 22 magnetized in two poles, a stator 37 that generates a magnetic field around the rotor 22 by passing a current through the coil 36, and rotation of the rotor 22. A magnetic sensor 54B for detecting the direction of the magnetic pole of the rotor 22 is provided for detection.

第２ステップモータ４２の回転検知用の磁気センサ５４Ｂを利用して外部磁界を検出する場合には、図１２のフローチャートに示すように、ＣＰＵ４５が磁気センサ５４Ｂの出力を取得したら（ステップＳ４１）、第２ステップモータ４２が回転停止中であったか判別し（ステップＳ４２）、また、ロータ２２の向きを確認するため第２ステップモータ４２が偶数ステップにあるか否かを判別する（ステップＳ４３，Ｓ４４）。そして、これらの各場合に応じて、ロータ２２の停止中であればロータ２２から及ぼされる磁界をロータ２２の向きに応じてオフセット値Ａ，Ｂとして、磁気センサ５４Ｂの出力からこれらオフセット値Ａ，Ｂを差し引く（ステップＳ４５，Ｓ４６：オフセット手段）。 When the external magnetic field is detected using the magnetic sensor 54B for detecting the rotation of the second step motor 42, as shown in the flowchart of FIG. 12, the CPU 45 acquires the output of the magnetic sensor 54B (step S41). It is determined whether or not the second step motor 42 has stopped rotating (step S42), and it is determined whether or not the second step motor 42 is in an even number step in order to confirm the orientation of the rotor 22 (steps S43 and S44). . Then, according to each of these cases, if the rotor 22 is stopped, the magnetic field exerted from the rotor 22 is set as the offset values A and B according to the direction of the rotor 22, and the offset values A and B are output from the output of the magnetic sensor 54B. B is subtracted (steps S45 and S46: offset means).

また、ロータ２２の回転駆動中であれば、ロータ２２やステータ３７から及ぼされる磁界のパターン波形を、ロータ２２の向きに応じたパターン波形Ａ，Ｂとして、磁気センサ５４Ｂの出力のサンプリング波形からこれらの波形Ａ，Ｂを差し引く（ステップＳ４７，Ｓ４８：オフセット手段）。なお、上記のオフセットＡ，Ｂやパターン波形Ａ，Ｂは、予め制御データとしてＲＯＭ４６に記憶されているものである。 If the rotor 22 is being driven to rotate, the pattern waveform of the magnetic field exerted from the rotor 22 and the stator 37 is changed to pattern waveforms A and B corresponding to the orientation of the rotor 22 from the sampling waveform output from the magnetic sensor 54B. Are subtracted (steps S47, S48: offset means). The offsets A and B and the pattern waveforms A and B are previously stored in the ROM 46 as control data.

そして、上記のようにステップモータ４２から及ぼされる磁界の成分を除去した磁気センサ５４Ｂの出力から外部磁界の大きさを求める（ステップＳ４９）。 And the magnitude | size of an external magnetic field is calculated | required from the output of the magnetic sensor 54B which removed the component of the magnetic field exerted from the step motor 42 as mentioned above (step S49).

以上のように、この第２実施形態のアナログ電子時計によれば、外部磁界を検出する磁気センサ５４Ｂを第２ステップモータ４２の回転検知用の磁気センサ５４Ｂと兼用しているので、部品点数の削減が図れる。 As described above, according to the analog electronic timepiece of the second embodiment, the magnetic sensor 54B for detecting the external magnetic field is also used as the magnetic sensor 54B for detecting the rotation of the second step motor 42. Reduction can be achieved.

また、外部磁界を検出する際には、例えばソフトウェア処理により、磁気センサ５４の出力からロータ２２やステータ３７の磁界成分を除去して、外部磁界の大きさを求めるので、正確な外部磁界の検出を行うことができる。 Further, when detecting the external magnetic field, the magnitude of the external magnetic field is obtained by removing the magnetic field components of the rotor 22 and the stator 37 from the output of the magnetic sensor 54 by, for example, software processing. It can be performed.

なお、本発明は、上記実施の形態に限られるものではなく、様々な変更が可能である。例えば、上記の実施形態では、運針停止中に第１ステップモータ４１の回転を検出するために、秒針車２５に透過孔２５ａを設けて、この透過孔２５ａの移動を検出する構成を例示したが、例えば五番車２３に透過孔を設けて、この透過孔の移動を検出する構成としたり、または、第１ステップモータ４１と秒針１１とを連結する歯車以外に、別途、回転検出用にロータ２１の回転が伝達されて回転する回転体を設け、この回転体に透過孔を設けて、その移動を検出する構成としても良い。 The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above-described embodiment, the configuration in which the transmission wheel 25a is provided in the second hand wheel 25 and the movement of the transmission hole 25a is detected in order to detect the rotation of the first step motor 41 while the hand movement is stopped is illustrated. For example, a transmission hole is provided in the fifth wheel & pinion 23 and the movement of the transmission hole is detected, or a rotor for detecting rotation is separately provided in addition to the gear connecting the first step motor 41 and the second hand 11. A configuration may be adopted in which a rotating body that is rotated by the rotation of the rotation 21 is provided, a transmission hole is provided in the rotating body, and the movement is detected.

また、上記実施形態では、図９（ａ）〜（ｄ）に示すように、ロータ２２がステップ停止位置にあるときに、透過孔２５ａが２個の受光部５，６の中央位置に重なる配置としたが、例えば、ロータ２２がステップ停止位置にあるときに、図９（ｂ）の状態や図９（ｃ）の状態となるような配置としても良い。この場合でも、図９（ｂ）→（ｃ）→（ｄ）→（ｂ）やその逆の状態遷移をそれぞれ検出していくことで、同様に、回転方向や回転の有無を求めることができる。 Moreover, in the said embodiment, as shown to Fig.9 (a)-(d), when the rotor 22 exists in a step stop position, the permeation | transmission hole 25a overlaps with the center position of the two light-receiving parts 5 and 6. However, for example, when the rotor 22 is at the step stop position, the arrangement shown in FIG. 9B or FIG. 9C may be employed. Even in this case, the rotation direction and the presence / absence of rotation can be obtained in the same manner by detecting each of the state transitions in FIG. 9 (b) → (c) → (d) → (b) and vice versa. .

また、上記実施形態では、２個の受光部５，６の検出パターンの変化に基づいて、秒針車２５の回転方向や回転の有無を検出しているが、３個やそれ以上の受光部を透過孔２５ａの回転方向に並べて、これら複数の受光部の検出パターンの変化により、秒針車２５の回転方向や回転の有無を検出することもできる。 Moreover, in the said embodiment, based on the change of the detection pattern of the two light-receiving parts 5 and 6, the rotation direction of the second hand wheel 25 and the presence or absence of rotation are detected, but three or more light-receiving parts are detected. It is also possible to detect the rotation direction of the second hand wheel 25 and the presence / absence of rotation by changing the detection patterns of the plurality of light receiving units, arranged in the rotation direction of the transmission hole 25a.

また、上記実施の形態では、アナログ電子時計の秒針１１の位置ズレを防止する構成に本発明を適用した例を示したが、例えば、分針１２や時針１３の位置ズレを防止する構成として適用することも可能である。また、アナログ電子時計に限らず、電気的な制御によって指針を回転させて方位を指し示す電子方位計や、電気的な制御により指針を回転させて種々の情報を指し示す各種メータにも、本発明の指針駆動制御装置を適用可能である。 In the above-described embodiment, the example in which the present invention is applied to the configuration for preventing the displacement of the second hand 11 of the analog electronic timepiece has been described. However, for example, the configuration is applied to the configuration for preventing the displacement of the minute hand 12 and the hour hand 13. It is also possible. The present invention is not limited to an analog electronic timepiece, and is applicable to an electronic azimuth meter that indicates a direction by rotating a pointer by electrical control, and various meters that indicate various information by rotating a pointer by electrical control. A pointer drive control device can be applied.

また、発光部４や受光部５，６は、ミラーにより光を反射させたり導光部材を介して所定経路で光を導いたりすることで、透過孔２５ａを挟んで対向する配置とせずに、その他の配置で同様の作用を得ることもできる。その他、実施形態で示した細部構造および方法は、発明の趣旨を逸脱しない範囲で適宜変更可能である。 In addition, the light emitting unit 4 and the light receiving units 5 and 6 reflect light by a mirror or guide light through a light guide member through a predetermined path, so that the light emitting unit 4 and the light receiving units 5 and 6 do not face each other across the transmission hole 25a. Similar effects can be obtained with other arrangements. In addition, the detailed structure and method shown in the embodiments can be appropriately changed without departing from the spirit of the invention.

１アナログ電子時計
４発光部
５第１受光部
６第１受光部
１１秒針
２１ロータ
２３五番車
２５秒針車
２５ａ透過孔
４１第１ステップモータ
４３検出部
４５ＣＰＵ
４６ＲＯＭ
４７ＲＡＭ
５４磁気センサ
５４Ｂ磁気センサ DESCRIPTION OF SYMBOLS 1 Analog electronic timepiece 4 Light emission part 5 1st light-receiving part 6 1st light-receiving part 11 Second hand 21 Rotor 23 Fifth wheel 25 Second hand wheel 25a Transmission hole 41 First step motor 43 Detection part 45 CPU
46 ROM
47 RAM
54 Magnetic sensor 54B Magnetic sensor

Claims

A pointer that points to information by the rotational position;
A step motor for rotating the pointer,
Drive control means for controlling the drive of the step motor;
A rotating body having a plurality of transmission holes arranged at predetermined intervals in the rotation direction and rotated by a predetermined angle by one step rotation of the step motor;
A light emitting unit that irradiates light to a portion through which the plurality of transmission holes of the rotating body passes;
At least two light receiving elements that are arranged side by side in a direction corresponding to the direction in which the plurality of transmission holes are arranged, and that detect light that has passed through the transmission holes when the transmission holes are positioned at the light irradiation positions of the light emitting units. And
Magnetic field detection means for detecting a magnetic field;
Stop control means for stopping the driving of the step motor by the drive control means based on detection of the magnetic field of the magnetic field detection means;
Light emission control means for driving the light emitting unit during stoppage of driving of the step motor by the stop control means,
Rotation amount calculation means for determining the rotation amount of the rotating body based on the light receiving state of the at least two light receiving parts during the stop of the driving of the step motor by the stop control means;
After the rotation amount is calculated by the rotation amount calculation means, when the magnetic field detected by the magnetic field detection means becomes small, the step motor is driven by the number of steps obtained by adding or subtracting the rotation amount to correct the position of the pointer. Correction control means for
A pointer drive control device comprising:

The pointer drive control device according to claim 1, wherein the plurality of transmission holes are formed for each rotation angle of the rotating body corresponding to one step rotation of the step motor.

The pointer driving control device according to claim 1, wherein the rotating body is a gear that transmits a rotational motion of the step motor to the pointer.

2. The pointer drive control device according to claim 1, wherein the stop control unit stops the driving of the step motor when a magnetic field exceeding a predetermined level is detected by the magnetic field detection unit.

The rotation amount calculating means includes
Of the at least two light receiving units, the first light receiving unit receives light and the second light receiving unit receives light sequentially, the first light receiving unit receives light, the second light receiving unit receives no light, and the first light receiving unit receives light. When a transition to a non-light-receiving state at one light-receiving unit, a light-receiving state at the second light-receiving unit, a light-receiving state at the first light-receiving unit, and a light-receiving state at the second light-receiving unit is detected, the rotating body receives the first light-receiving unit. It is determined that the plurality of transmission holes are rotated in the rotation direction from the part side toward the second light receiving part side,
The first light receiving unit receives light and the second light receiving unit receives light in order, the first light receiving unit receives no light, the second light receiving unit receives light, the first light receiving unit receives light, and the second light receiving unit sequentially receives light. When the transition to the non-light receiving state, the light receiving by the first light receiving unit, and the light receiving state by the second light receiving unit is detected, the rotating body moves from the second light receiving unit side to the first light receiving unit side. The pointer drive control device according to claim 1, wherein the pointer driving control device is determined to have rotated in the direction of rotation toward the formation interval of the plurality of transmission holes.

2. The pointer drive control device according to claim 1, further comprising a light shielding member that blocks light between the two adjacent light receiving portions and protrudes toward the rotating body.

A magnetic sensor for detecting the rotation of the step motor;
2. The pointer drive control device according to claim 1, wherein the magnetic field detecting means is also used as the magnetic sensor.

An offset means for subtracting a correction amount corresponding to a magnetic field generated by driving the step motor from the detection amount of the magnetic sensor;
8. The pointer drive control device according to claim 7, wherein the stop control unit stops the driving of the step motor based on a detection amount of the sensor obtained by subtracting the correction amount by the offset unit.

The pointer drive control device according to any one of claims 1 to 8,
An analog electronic timepiece characterized in that the pointer is a second hand, a minute hand or an hour hand which rotates on a dial plate and displays a time.

A counter means for counting the passage of time during stoppage of driving of the step motor by the stop control means;
The correction control means corrects the position of the pointer by driving the step motor by the number of steps obtained by adding or subtracting the rotation amount obtained by the rotation amount calculation means to the count value of the counter means. Item 10. The analog electronic timepiece according to Item 9.