JP2018077182A - Rotational position detector of clock hand - Google Patents

Rotational position detector of clock hand Download PDF

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JP2018077182A
JP2018077182A JP2016220405A JP2016220405A JP2018077182A JP 2018077182 A JP2018077182 A JP 2018077182A JP 2016220405 A JP2016220405 A JP 2016220405A JP 2016220405 A JP2016220405 A JP 2016220405A JP 2018077182 A JP2018077182 A JP 2018077182A
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light
pipe
receiving element
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light guide
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浩 加部
Hiroshi Kabe
浩 加部
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Rhythm Watch Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a rotational position detector of a clock hand capable of preventing reduction in sensor sensitivity by condensing a light reaching a light receiving element as much as possible.SOLUTION: A rotation position detector 100 for an analog clock including a circuit board 300 controlling a motor, comprises a rotor 10 on a base end part of a clock hand pipe and detects the positions of a second hand, a minute hand and an hour hand based on a rotational position of the rotor 10. A light-emitting element 110 and a light receiving element 120 are mounted on the circuit board 300, and a light guide body 130 is provided for guiding a light of the light-emitting element 110 to the light receiving element 120. The light-emitting element 110, the light guide body 130 and the light receiving element 120 form a U-shaped light path A. A pipe length L1 of a second pipe part 220a forming the light path A is set to be equal to or greater than a half of a length L2 between the light guide body 130 and the light receiving element 120, and further a pipe inner diameter a of the second pipe part 220a closer to the light receiving element 120 side is formed to be smaller than a pipe inner diameter b thereof closer to the light guide body 130 side.SELECTED DRAWING: Figure 5

Description

本発明は、発光素子および受光素子を用いて回転体の回転位置を検出する時計指針の回転位置検出装置に関する。   The present invention relates to a rotation position detection device for a timepiece that detects a rotation position of a rotating body using a light emitting element and a light receiving element.

駆動機構に設けられる時計指針の回転位置検出装置としては、回転体を挟むように発光素子および受光素子を対向配置して、回転体に設けられた透光部を検出するように構成されたものが知られている。いわゆる透過型フォトセンサの基本的な応用形態である。特許文献１〜５には、この種の回転位置検出装置が設けられたアナログ時計のムーブメントが開示されている。   As a rotation position detection device for a clock pointer provided in the driving mechanism, a light emitting element and a light receiving element are arranged to face each other so as to sandwich the rotating body, and a light transmitting portion provided in the rotating body is detected. It has been known. This is a basic application form of a so-called transmissive photosensor. Patent Documents 1 to 5 disclose a movement of an analog timepiece provided with this type of rotational position detection device.

また、発光素子および受光素子は、導光体を用いて光の進行方向を反転させることにより、回転体に対して片側に配置することも可能である。すなわち、発光素子と受光素子を片側に、導光体を反対側に、それぞれ配置して光路を構成すると、駆動機構の内部における配線構造が簡素化されるという利点がある。   In addition, the light emitting element and the light receiving element can be arranged on one side with respect to the rotating body by reversing the traveling direction of light using a light guide. That is, if the light path is configured by arranging the light emitting element and the light receiving element on one side and the light guide on the opposite side, there is an advantage that the wiring structure inside the drive mechanism is simplified.

前述したように発光素子および受光素子を回転体に対して片側に配置する場合は、配線構造が簡素化されるという大きな利点があるものの、光の進行方向の反転に伴いその光にロスが生じるため、これが検出精度に影響するという事情がある。発光素子の光量を増加する、或いは受光素子の感度を上げることにより対処することも可能であるが、発光素子と受光素子とが隣接していると、受光素子が発光素子の光を直接受光してしまう、或いは駆動機構の内部で反射された光を受光してしまう可能性が高まることとなる。時計指針の回転位置検出装置については、このような課題に対処するべく更なる工夫が必要であると考えられる。   As described above, when the light emitting element and the light receiving element are arranged on one side with respect to the rotating body, there is a great advantage that the wiring structure is simplified, but loss of light occurs as the light traveling direction is reversed. Therefore, there is a situation that this affects the detection accuracy. It is possible to cope with this problem by increasing the light intensity of the light emitting element or increasing the sensitivity of the light receiving element. However, if the light emitting element and the light receiving element are adjacent to each other, the light receiving element directly receives the light from the light emitting element. In other words, the possibility of receiving light reflected inside the drive mechanism increases. It is considered that the device for detecting the rotational position of the timepiece pointer needs to be further devised to cope with such a problem.

そこで、本願出願人は、下記の発明を提案した（特許文献６）。すなわち、この発明に係る回転位置検出装置は、モータと、モータに連結されたギア列からなる減速機構と、指針を装着する指針パイプと、それらを収納するケース体と、モータを制御する回路基板とを備えたアナログ時計の駆動機構に用いられるものであって、指針パイプの基端部に設けられたギア部からなる回転体を備える。   Therefore, the present applicant has proposed the following invention (Patent Document 6). That is, the rotational position detection device according to the present invention includes a motor, a speed reduction mechanism including a gear train coupled to the motor, a pointer pipe for mounting the pointer, a case body for storing them, and a circuit board for controlling the motor. And a rotating body composed of a gear portion provided at the base end portion of the pointer pipe.

さらに、図１２に示すように、この回転位置検出装置１００は、回転体１０を回転する駆動機構に設けられて、当該回転体１０の回転位置から秒針、分針および時針の位置を検出するものであって、当該回転位置検出装置１００は、回路基板３００に搭載された発光素子１１０および受光素子１２０と、発光素子１１０の光を受光素子１２０に導く導光体１３０とを備える。   Further, as shown in FIG. 12, the rotational position detection device 100 is provided in a drive mechanism that rotates the rotating body 10, and detects the positions of the second hand, the minute hand, and the hour hand from the rotational position of the rotating body 10. The rotational position detection apparatus 100 includes a light emitting element 110 and a light receiving element 120 mounted on the circuit board 300, and a light guide 130 that guides light from the light emitting element 110 to the light receiving element 120.

そして、回転体１０が発光素子１１０の光の経路Ａに位置し、回転体１０に設けられた透光部１１が回転体１０の回転に伴い光の経路Ａを横切ることにより、回転体１０の回転位置を検出する。   The rotating body 10 is positioned in the light path A of the light emitting element 110, and the light transmitting portion 11 provided in the rotating body 10 crosses the light path A along with the rotation of the rotating body 10. Detect the rotational position.

また、ケース体２００は、回転体１０をその回転軸方向の両側から挟む正面側の第１ケース部材２１０および背面側の第２ケース部材２２０を備え、更に、第１ケース部材２１０には、第２ケース部材２２０に向って突出する第１パイプ部２１０ａを設けるとともに、第２ケース部材２２０には、第１ケース部材２１０に向って突出する第２パイプ部２２０ａを設ける。この第１パイプ部２１０ａと第２パイプ部２２０ａは、互いに先端が当接する。これにより、光の経路Ａは、第１パイプ部２１０ａおよび第２パイプ部２２０ａの内部を通過するようにして時計指針の回転位置検出装置１００が構成される。   Further, the case body 200 includes a first case member 210 on the front side and a second case member 220 on the back side that sandwich the rotating body 10 from both sides in the rotation axis direction. A first pipe portion 210 a that protrudes toward the two case member 220 is provided, and a second pipe portion 220 a that protrudes toward the first case member 210 is provided at the second case member 220. The first pipe portion 210a and the second pipe portion 220a are in contact with each other at their tips. Thereby, the rotation position detection device 100 of the timepiece pointer is configured such that the light path A passes through the first pipe part 210a and the second pipe part 220a.

特開２００２−１０７４６５号公報JP 2002-107465 A 特開２００９−１９８４２１号公報JP 2009-198421 A 特許第４６４３９４１号公報Japanese Patent No. 4643941 特開２０１０−２０３８２８号公報JP 2010-203828 A 特開２０１０−２８１７７３号公報JP 2010-281773 A 特許第５８４７０４１号公報Japanese Patent No. 5847041

上述した時計指針の回転位置検出装置は、発光素子と受光素子を同一の回路基板に搭載することにより、前後別々の基板に設けるものに比べ作業効率を向上させることが可能となった。他方で、発光素子の光を受光素子に導く導光体を備えて、光の経路をいわゆるコ字形状にしているので、光路の距離が長くなり、光量が減衰しセンサ感度が低下するきらいがあった。   The above-described rotational position detection device for a watch hand can improve the working efficiency by mounting the light emitting element and the light receiving element on the same circuit board as compared with those provided on the front and rear separate boards. On the other hand, a light guide that guides the light of the light emitting element to the light receiving element is provided and the light path is so-called U-shaped, so that the distance of the optical path becomes long, the amount of light attenuates, and the sensor sensitivity decreases. there were.

そこで、本発明は、受光素子に到達する光を集約させ、もってセンサ感度の低下を可及的に阻止できる時計指針の回転位置検出装置を提案するものである。   In view of the above, the present invention proposes a rotation position detecting device for a timepiece that aggregates light reaching a light receiving element and thereby prevents a decrease in sensor sensitivity as much as possible.

本願第１請求項に記載した発明は、モータと、モータに連結されたギア列からなる減速機構と、指針を装着する指針パイプと、それらを収納するケース体２００と、モータを制御する回路基板３００とを備えたアナログ時計の駆動機構１に用いられるものであって、前記指針パイプの基端部には、回転体１０を備えて、当該回転体１０の回転位置から秒針、分針および時針の位置を検出する回転位置検出装置１００において、
前記回路基板３００に発光素子１１０および受光素子１２０を搭載するとともに、前記発光素子１１０の光を受光素子１２０に導く導光体１３０を設けて、前記発光素子１１０、前記導光体１３０および受光素子１２０でコ字形状の光の経路Ａを形成し、
前記ケース体２００は、前記回転体１０をその回転軸方向の両側から挟む正面側の第１ケース部材２１０と背面側の第２ケース部材２２０とを備え、
前記第１ケース部材２１０には、前記第２ケース部材２２０に向って突出する第１パイプ部２１０ａを設けるとともに、前記第２ケース部材２２０には、前記第１ケース部材２１０に向って突出する第２パイプ部２２０ａを設け、
前記第１パイプ部２１０ａと前記第２パイプ部２２０ａは、互いに先端が係合して、前記光の経路Ａが、前記第１パイプ部２１０ａおよび前記第２パイプ部２２０ａの内部を通過するように設け、
更に、前記第２パイプ部２２０ａのパイプ長さＬ１が、前記導光体１３０と前記受光素子１２０間の長さＬ２の２分の１以上に設けられるとともに、前記第２パイプ部２２０ａの前記受光素子１２０側のパイプ内径ａが、前記導光体１３０側のパイプ内径ｂよりも小さく形成されていることを特徴とする時計指針の回転位置検出装置１００である。 The invention described in the first claim of the present application is a motor, a speed reduction mechanism comprising a gear train coupled to the motor, a pointer pipe for mounting the pointer, a case body 200 for storing them, and a circuit board for controlling the motor 300, which is used in an analog timepiece driving mechanism 1 having a rotating body 10 at the proximal end of the pointer pipe, and from the rotational position of the rotating body 10 to the second, minute and hour hands. In the rotational position detection device 100 that detects the position,
The light emitting element 110 and the light receiving element 120 are mounted on the circuit board 300, and a light guide 130 for guiding the light of the light emitting element 110 to the light receiving element 120 is provided, and the light emitting element 110, the light guide 130, and the light receiving element are provided. 120, a U-shaped light path A is formed,
The case body 200 includes a first case member 210 on the front side and a second case member 220 on the back side that sandwich the rotating body 10 from both sides in the rotation axis direction.
The first case member 210 is provided with a first pipe portion 210 a that protrudes toward the second case member 220, and the second case member 220 includes a first pipe portion 210 a that protrudes toward the first case member 210. 2 pipe portions 220a are provided,
The first pipe part 210a and the second pipe part 220a are engaged with each other so that the light path A passes through the first pipe part 210a and the second pipe part 220a. Provided,
Further, the pipe length L1 of the second pipe portion 220a is provided at a half or more of the length L2 between the light guide 130 and the light receiving element 120, and the light reception of the second pipe portion 220a. An apparatus 100 for detecting the rotational position of a timepiece is characterized in that a pipe inner diameter a on the element 120 side is formed smaller than a pipe inner diameter b on the light guide 130 side.

本願第１請求項に記載した発明によれば、発光素子１１０、導光体１３０および受光素子１２０で形成される光の経路Ａがコ字形状であっても、第２パイプ部２２０ａの受光素子１２０側のパイプ内径ａが、導光体１３０側のパイプ内径ｂよりも小さく形成されているので、導光体１３０からの光が当該パイプの形状により収斂される作用効果を奏する。更に、このパイプ長さＬ１が、導光体１３０と受光素子１２０間の長さＬ２の２分の１以上に設けられているので、光の収斂効果が担保され、結果、センサ感度の低下を最小限にとどめることができる。   According to the first aspect of the present invention, even if the light path A formed by the light emitting element 110, the light guide 130, and the light receiving element 120 is U-shaped, the light receiving element of the second pipe portion 220a. Since the pipe inner diameter a on the 120 side is formed smaller than the pipe inner diameter b on the light guide 130 side, there is an effect that the light from the light guide 130 is converged by the shape of the pipe. Furthermore, since this pipe length L1 is provided more than one half of the length L2 between the light guide 130 and the light receiving element 120, the light convergence effect is ensured, resulting in a decrease in sensor sensitivity. Can be kept to a minimum.

本発明の実施例に係り、時計のムーブメントを示す正面図である。It is a front view which shows the movement of a timepiece according to the Example of this invention. 本発明の実施例に係り、時計のムーブメントを示す背面図である。It is a back view which shows the movement of the timepiece concerning the Example of this invention. 本発明の実施例に係り、時計のムーブメントを示す側面図である。It is a side view which shows the movement of a timepiece according to the Example of this invention. 本発明の実施例に係り、時計のムーブメントの内部を示す側面断面図である。FIG. 4 is a side sectional view showing the inside of the movement of the watch according to the embodiment of the present invention. 本発明の実施例に係り、図４の要部拡大図であり、回転位置検出装置を示す説明図である。FIG. 5 is an enlarged view of a main part of FIG. 4 according to the embodiment of the present invention, and is an explanatory view showing a rotational position detection device. 本発明の実施例に係り、時計のムーブメントを示す分解斜視図（正面側）である。1 is an exploded perspective view (front side) showing a movement of a timepiece according to an embodiment of the present invention. 本発明の実施例に係り、時計のムーブメントを示す分解斜視図（背面側）である。FIG. 4 is an exploded perspective view (back side) showing a movement of a timepiece according to the embodiment of the present invention. 本発明の実施例に係り、回路基板を示す背面図である。It is a rear view which shows the circuit board concerning the Example of this invention. 本発明の実施例に係り、ケース体を示す正面図である。It is a front view which concerns on the Example of this invention and shows a case body. 本発明の実施例に係り、導光体、遮蔽部材、および第２ケース部材の要部を示す斜視図（正面側）である。It is a perspective view (front side) which shows the principal part of a light guide, a shielding member, and a 2nd case member concerning the Example of this invention. 本発明の実施例に係り、導光体、遮蔽部材、及び第２ケース部材の要部を示す斜視図（背面側）である。It is a perspective view (back side) which shows the principal part of a light guide, a shielding member, and a 2nd case member concerning the Example of this invention. 従来例に係り、回転位置検出装置を示す説明図である。It is explanatory drawing which concerns on a prior art example and shows a rotation position detection apparatus.

以下に、本発明の実施例を図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１〜図１１に示す駆動機構１は、指針を駆動するアナログ時計のムーブメントである。この駆動機構１は、モータ、モータに連結されたギア列からなる減速機構、指針を装着する指針パイプ、それらを収納するケース体２００、モータを制御する回路基板３００を備える。そして、指針パイプが減速機構を介してモータにより所定の速度で回転駆動するように構成されている。指針パイプとしては、分針を装着する分針パイプと、時針を装着する時針パイプとを備えている。時針パイプは、日の裏車を介して分針パイプに従動する。   A driving mechanism 1 shown in FIGS. 1 to 11 is an analog timepiece movement for driving a pointer. The drive mechanism 1 includes a motor, a speed reduction mechanism including a gear train connected to the motor, a pointer pipe for mounting the pointer, a case body 200 for storing them, and a circuit board 300 for controlling the motor. The pointer pipe is configured to be driven to rotate at a predetermined speed by a motor via a speed reduction mechanism. The indicator pipe includes a minute hand pipe for attaching a minute hand and an hour hand pipe for attaching an hour hand. The hour hand pipe follows the minute hand pipe through the minute wheel.

本例の回転位置検出装置１００は、回転体１０を回転する駆動機構１に設けられ、回転体１０の回転位置を検出するものであり、検出対象とする回転体１０は、特に限定はしないが、本例では秒針軸の基端部、分針パイプの基端部に設けられたギア部、および時針パイプの基端部に設けられたギア部となっている。   The rotational position detection device 100 of this example is provided in the drive mechanism 1 that rotates the rotating body 10 and detects the rotational position of the rotating body 10. The rotating body 10 to be detected is not particularly limited. In this example, the second hand shaft has a proximal end portion, a gear portion provided at the proximal end portion of the minute hand pipe, and a gear portion provided at the proximal end portion of the hour hand pipe.

この回転位置検出装置１００は、回路基板３００に搭載された発光素子１１０および受光素子１２０と、発光素子１１０の光を受光素子１２０に導く導光体１３０とを備え、各回転体１０が発光素子１１０の光の経路Ａ（図５参照）に位置し、各回転体１０に設けられた各透光部１１が回転体１０の回転に伴い光の経路Ａをそれぞれ横切ることにより、各回転体１０の回転位置を検出する構成となっている。発光素子１１０および受光素子１２０を回転体１０に対して片側に配置したものである。受光素子１２０の検出パターンから分針および時針の位置を検出する。   The rotational position detection apparatus 100 includes a light emitting element 110 and a light receiving element 120 mounted on a circuit board 300, and a light guide 130 that guides light from the light emitting element 110 to the light receiving element 120. Each rotating body 10 is a light emitting element. 110, each light transmitting portion 11 provided in each rotating body 10 crosses the light path A along with the rotation of the rotating body 10, whereby each rotating body 10 is located. The rotation position is detected. The light emitting element 110 and the light receiving element 120 are arranged on one side with respect to the rotating body 10. The positions of the minute hand and hour hand are detected from the detection pattern of the light receiving element 120.

ケース体２００は、回転体１０をその回転軸方向の両側から挟む第１ケース部材２１０および第２ケース部材２２０を備える。第１ケース部材２１０および第２ケース部材２２０は、所定の形状の射出成形部材である。回路基板３００は、これを第１ケース部材２１０に設けるとともに、導光体１３０は、これを第２ケース部材２２０に設ける。   The case body 200 includes a first case member 210 and a second case member 220 that sandwich the rotating body 10 from both sides in the rotation axis direction. The first case member 210 and the second case member 220 are injection molded members having a predetermined shape. The circuit board 300 is provided on the first case member 210, and the light guide 130 is provided on the second case member 220.

図示したケース体２００は、正面側の第１ケース部材２１０および背面側の第２ケース部材２２０をその厚さ方向に組付けてなる扁平型のものであり、ケース体２００の内部には、モータ、減速機構、および指針パイプの基端部が収納されている。第１ケース部材２１０および第２ケース部材２２０は、互いにスナップ止め、またはねじ止めされている。回路基板３００は、ケース体２００の外側（正面側）となる面に設けられている。具体的には、第１ケース部材２１０の正面側に重ねてねじ止めされている。また、指針パイプの先端部が第１ケース部材２１０から正面に向けて突出しており、回路基板３００には指針パイプの先端部を挿通する孔部が設けられている。   The illustrated case body 200 is a flat type in which a first case member 210 on the front side and a second case member 220 on the back side are assembled in the thickness direction. The base end of the speed reduction mechanism and the pointer pipe is housed. The first case member 210 and the second case member 220 are snapped or screwed together. The circuit board 300 is provided on a surface that is the outside (front side) of the case body 200. Specifically, the first case member 210 is screwed on the front side. The tip of the pointer pipe protrudes from the first case member 210 toward the front, and the circuit board 300 is provided with a hole through which the tip of the pointer pipe is inserted.

第１ケース部材２１０には、ケース体２００の外側（正面側）となる面から発光素子１１０および受光素子１２０をそれぞれ挿入する発光素子挿入凹部２１１および受光素子挿入凹部２１２が設けられている。   The first case member 210 is provided with a light emitting element insertion recess 211 and a light receiving element insertion recess 212 into which the light emitting element 110 and the light receiving element 120 are inserted from the outer (front side) surface of the case body 200, respectively.

また、第２ケース部材２２０には、ケース体２００の外側（背面側）となる面から導光体１３０を挿入する導光体挿入凹部２２１と、導光体挿入凹部２２１に挿入した導光体１３０を被う遮光部材２２２とが設けられている。導光体１３０は、導光体挿入凹部２２１に圧入される。この導光体１３０は、一方の部位から入射した光を一対の端面でそれぞれ反射して他方の部位から射出するものである。遮光部材２２２は、プレート状またはシール状の部材であり、第２ケース部材２２０には、導光体挿入凹部２２１全体を囲む遮光部材装着凹部２２３が設けられている。遮光部材２２２は、遮光部材装着凹部２２３に接着して装着される。   The second case member 220 includes a light guide body insertion recess 221 into which the light guide body 130 is inserted from the outer (back side) surface of the case body 200, and a light guide body inserted into the light guide body insertion recess 221. A light shielding member 222 covering 130 is provided. The light guide 130 is press-fitted into the light guide insertion recess 221. The light guide 130 reflects light incident from one part at a pair of end surfaces and emits light from the other part. The light shielding member 222 is a plate-like or seal-like member, and the second case member 220 is provided with a light shielding member mounting recess 223 that surrounds the entire light guide insertion recess 221. The light shielding member 222 is attached by being adhered to the light shielding member mounting recess 223.

このような構成によると、ケース体２００に対して導光体１３０を正確に且つ容易に組付けることができる。導光体１３０を組付ける前に導光体挿入凹部２２１を利用してケース体２００の外部から発光素子１１０および受光素子１２０の検査を行なうことも可能である。   With such a configuration, the light guide 130 can be accurately and easily assembled to the case body 200. It is also possible to inspect the light emitting element 110 and the light receiving element 120 from the outside of the case body 200 using the light guide insertion recess 221 before assembling the light guide 130.

特に本例の場合、導光体１３０は、導光体挿入凹部２２１への挿入方向から見た輪郭形状と、その挿入方向の逆側から見た輪郭形状とが一致しない構成となっている。すなわち、輪郭形状が一致していると、製造時に挿入方向を誤って導光体１３０を挿入してしまう場合が考えられる。導光体１３０を一旦挿入してしまうと、これを抜出す作業に手間がかかる上に、部材の変形や破損が生じる可能性もある。そこで本例では、導光体１３０の要所に突片１３１を設け、そのような事態を未然に防止している。図例した導光体１３０は、挿入方向から見た輪郭形状が、矩形に複数の突片１３１を設けた形状となっている。突片１３１は、角を形成する２辺にそれぞれ設けられている。導光体挿入凹部２２１の形状は、その輪郭形状よりも僅かに大きいものとなっている。導光体１３０は、挿入方向を反転すると導光体挿入凹部２２１に挿入されることはない。   In particular, in the case of this example, the light guide 130 has a configuration in which the contour shape viewed from the insertion direction into the light guide insertion recess 221 does not match the contour shape viewed from the opposite side of the insertion direction. That is, if the contour shapes match, the light guide 130 may be inserted in the wrong insertion direction during manufacturing. Once the light guide 130 is inserted, it takes time to extract the light guide 130, and the member may be deformed or damaged. Therefore, in this example, the projecting piece 131 is provided at the main point of the light guide 130 to prevent such a situation in advance. The illustrated light guide 130 has a shape in which a plurality of protruding pieces 131 are provided in a rectangular shape when viewed from the insertion direction. The protrusion 131 is provided on each of two sides forming a corner. The shape of the light guide insertion recess 221 is slightly larger than the contour shape. The light guide 130 is not inserted into the light guide insertion recess 221 when the insertion direction is reversed.

また、第１ケース部材２１０および第２ケース部材２２０の少なくとも一方には、それらの他方に向って突出するパイプ部２１０ａ，２２０ａを設けている。光の経路Ａは、パイプ部２１０ａ，２２０ａの内部を通過する構成となっている。   Further, at least one of the first case member 210 and the second case member 220 is provided with pipe portions 210a and 220a protruding toward the other of them. The light path A is configured to pass through the pipe portions 210a and 220a.

本例の場合、第１ケース部材２１０には、第２ケース部材２２０に向って突出する第１パイプ部２１０ａを設けるとともに、第２ケース部材２２０には、第１ケース部材２１０に向って突出する第２パイプ部２２０ａを設けている。第１パイプ部２１０ａおよび第２パイプ部２２０ａは、互いに先端が係合するものとし、光の経路Ａは、第１パイプ部２１０ａおよび第２パイプ部２２０ａの内部を通過する構成となっている。ここで、先端が係合するとは、先端が当接し、嵌合し、あるいは若干の隙間を備えて対峙するなどの形態を意味する。   In the case of this example, the first case member 210 is provided with a first pipe portion 210 a that protrudes toward the second case member 220, and the second case member 220 protrudes toward the first case member 210. A second pipe portion 220a is provided. The first pipe portion 210a and the second pipe portion 220a are assumed to engage with each other, and the light path A is configured to pass through the inside of the first pipe portion 210a and the second pipe portion 220a. Here, the engagement of the tip means a form in which the tip abuts, fits, or confronts with a slight gap.

透光部１１を通過した発光素子１１０の光は、導光体１３０に入射され、導光体１３０に設けられた一対の端面で９０°づつ２回反射して導光体１３０から射出される。射出された光は、第２パイプ部２２０ａ、第１パイプ部２１０ａを順次通過して受光素子１２０にもたらされる。尚、発光素子１１０および受光素子１２０は、それらの位置関係を逆にすることも可能である。その場合、光の経路Ａの進行方向は逆向きとなる。   The light of the light emitting element 110 that has passed through the light transmitting part 11 enters the light guide 130, is reflected twice by 90 ° at a pair of end surfaces provided on the light guide 130, and is emitted from the light guide 130. . The emitted light sequentially passes through the second pipe part 220a and the first pipe part 210a and is brought to the light receiving element 120. Note that the positional relationship between the light emitting element 110 and the light receiving element 120 can be reversed. In that case, the traveling direction of the light path A is reversed.

このような構成によると、回転位置検出装置１００の検出精度を確実に向上することができる。すなわち、発光素子１１０および受光素子１２０を回転体１０に対して片側に配置する場合は、光の進行方向の反転に伴いその光にロスが生じるため、これが検出精度に影響するという事情があるところ、本例によれば、パイプ部２１０ａ，２２０ａにより光の拡散が防止される。故に、光のロスを低減することができる。また、受光素子１２０が発光素子１１０の光を直接受光してしまう、或いは駆動機構１の内部で反射された光を受光してしまう事態を防止することができる。   According to such a configuration, the detection accuracy of the rotational position detection device 100 can be reliably improved. That is, in the case where the light emitting element 110 and the light receiving element 120 are arranged on one side with respect to the rotating body 10, a loss occurs in the light with the reversal of the traveling direction of the light. According to this example, diffusion of light is prevented by the pipe portions 210a and 220a. Therefore, loss of light can be reduced. Further, it is possible to prevent a situation in which the light receiving element 120 directly receives the light of the light emitting element 110 or receives the light reflected inside the driving mechanism 1.

更に、第２パイプ部２２０ａのパイプ長さＬ１は、導光体１３０と受光素子１２０間の長さＬ２の２分の１以上に設けられるとともに、第２パイプ部２２０ａの受光素子１２０側のパイプ内径ａが、導光体１３０側のパイプ内径ｂよりも小さく形成されている。なお、第２パイプ部２２０ａにおける導光体１３０側の端部には、光収斂用の面取りが形成されている。   Furthermore, the pipe length L1 of the second pipe portion 220a is provided at a half or more of the length L2 between the light guide 130 and the light receiving element 120, and the pipe on the light receiving element 120 side of the second pipe portion 220a. The inner diameter a is formed smaller than the pipe inner diameter b on the light guide body 130 side. A chamfer for light convergence is formed at the end of the second pipe portion 220a on the light guide body 130 side.

このように、発光素子１１０、導光体１３０および受光素子１２０で形成される光の経路Ａがコ字形状であっても、第２パイプ部２２０ａの受光素子１２０側のパイプ内径ａが、導光体１３０側のパイプ内径ｂよりも小さく形成されているので、導光体１３０からの光が当該パイプの形状により収斂される作用効果を奏する。   As described above, even if the light path A formed by the light emitting element 110, the light guide 130, and the light receiving element 120 is U-shaped, the pipe inner diameter a on the light receiving element 120 side of the second pipe portion 220a is guided. Since it is formed smaller than the pipe inner diameter b on the light body 130 side, there is an effect that the light from the light guide body 130 is converged by the shape of the pipe.

また、このパイプ長さＬ１が、導光体１３０と受光素子１２０間の長さＬ２の２分の１以上に設けられているので、光の収斂効果が担保され、結果、センサ感度の低下を最小限にとどめることができる。   In addition, since the pipe length L1 is provided more than one half of the length L2 between the light guide 130 and the light receiving element 120, the light convergence effect is ensured, resulting in a decrease in sensor sensitivity. Can be kept to a minimum.

以上説明したように、本例の回転位置検出装置は、回転体の回転位置を検出する装置として極めて合理的に構成されたものである。尚、本例における各部の構成は、特許請求の範囲に記載した技術的範囲において適宜に設計変更が可能であり、図例で説明したものに限定されないことは勿論である。   As described above, the rotational position detection device of this example is extremely rationally configured as a device that detects the rotational position of the rotating body. In addition, it is needless to say that the configuration of each part in this example can be appropriately changed in design within the technical scope described in the claims, and is not limited to that described in the drawings.

本発明の回転位置検出装置は、アナログ時計のムーブメントに設け、その指針の位置を検出する装置として好適に利用することが可能である。   The rotational position detection device of the present invention can be suitably used as a device that is provided in a movement of an analog timepiece and detects the position of the hands.

１ 駆動機構（アナログ時計のムーブメント）
１０ 回転体
１１ 透光部
１００ 回転位置検出装置
１１０ 発光素子
１２０ 受光素子
１３０ 導光体
１３１ 突片
２００ ケース体
２１０ 第１ケース部材
２１０ａ 第１パイプ部
２１１ 発光素子挿入凹部
２１２ 受光素子挿入凹部
２２０ 第２ケース部材
２２０ａ 第２パイプ部
２２１ 導光体挿入凹部
２２２ 遮光部材
２２３ 遮光部材装着凹部
３００ 回路基板
Ａ 光の経路
Ｌ１ 第２パイプ部のパイプ長さ
Ｌ２ 導光体と受光素子間の長さ
ａ 第２パイプ部のパイプ内径（受光素子側）
ｂ 第２パイプ部のパイプ内径（導光体側）

1 Drive mechanism (analog clock movement)
DESCRIPTION OF SYMBOLS 10 Rotating body 11 Translucent part 100 Rotational position detection apparatus 110 Light emitting element 120 Light receiving element 130 Light guide 131 Projection piece 200 Case body 210 First case member 210a First pipe part 211 Light emitting element insertion recessed part 212 Light receiving element insertion recessed part 220 1st 2 Case member 220a 2nd pipe part 221 Light guide insertion recessed part 222 Light shielding member 223 Light shielding member mounting recessed part 300 Circuit board A Light path L1 Pipe length L2 of 2nd pipe part Length a between a light guide and a light receiving element a Pipe inner diameter of the 2nd pipe (light receiving element side)
b Pipe inner diameter of the second pipe part (light guide side)

Claims (1)

モータと、モータに連結されたギア列からなる減速機構と、指針を装着する指針パイプと、それらを収納するケース体（２００）と、モータを制御する回路基板（３００）とを備えたアナログ時計の駆動機構（１）に用いられるものであって、前記指針パイプの基端部には、回転体（１０）を備えて、当該回転体（１０）の回転位置から秒針、分針および時針の位置を検出する回転位置検出装置（１００）において、
前記回路基板（３００）に発光素子（１１０）および受光素子（１２０）を搭載するとともに、前記発光素子（１１０）の光を受光素子（１２０）に導く導光体（１３０）を設けて、前記発光素子（１１０）、前記導光体（１３０）および受光素子（１２０）でコ字形状の光の経路（Ａ）を形成し、
前記ケース体（２００）は、前記回転体（１０）をその回転軸方向の両側から挟む正面側の第１ケース部材（２１０）と背面側の第２ケース部材（２２０）とを備え、
前記第１ケース部材（２１０）には、前記第２ケース部材（２２０）に向って突出する第１パイプ部（２１０ａ）を設けるとともに、前記第２ケース部材（２２０）には、前記第１ケース部材（２１０）に向って突出する第２パイプ部（２２０ａ）を設け、
前記第１パイプ部（２１０ａ）と前記第２パイプ部（２２０ａ）は、互いに先端が係合して、前記光の経路（Ａ）が、前記第１パイプ部（２１０ａ）および前記第２パイプ部（２２０ａ）の内部を通過するように設け、
更に、前記第２パイプ部（２２０ａ）のパイプ長さ（Ｌ１）が、前記導光体（１３０）と前記受光素子（１２０）間の長さ（Ｌ２）の２分の１以上に設けられるとともに、前記第２パイプ部（２２０ａ）の前記受光素子（１２０）側のパイプ内径（ａ）が、前記導光体（１３０）側のパイプ内径（ｂ）よりも小さく形成されていることを特徴とする時計指針の回転位置検出装置（１００）。

An analog timepiece including a motor, a speed reduction mechanism including a gear train connected to the motor, a pointer pipe for mounting the pointer, a case body (200) for storing them, and a circuit board (300) for controlling the motor The rotating mechanism (10) is provided at the proximal end of the pointer pipe, and the position of the second, minute and hour hands from the rotational position of the rotating body (10) is used. In the rotational position detecting device (100) for detecting
The light emitting element (110) and the light receiving element (120) are mounted on the circuit board (300), and a light guide (130) for guiding the light of the light emitting element (110) to the light receiving element (120) is provided. The light emitting element (110), the light guide (130), and the light receiving element (120) form a U-shaped light path (A),
The case body (200) includes a first case member (210) on the front side and a second case member (220) on the back side that sandwich the rotating body (10) from both sides in the rotation axis direction.
The first case member (210) is provided with a first pipe portion (210a) protruding toward the second case member (220), and the second case member (220) is provided with the first case. Providing a second pipe portion (220a) protruding toward the member (210);
The first pipe part (210a) and the second pipe part (220a) are engaged with each other at their tips, and the light path (A) is the first pipe part (210a) and the second pipe part. (220a) is provided so as to pass through,
Furthermore, the pipe length (L1) of the second pipe part (220a) is provided at more than one half of the length (L2) between the light guide (130) and the light receiving element (120). The pipe inner diameter (a) on the light receiving element (120) side of the second pipe part (220a) is formed smaller than the pipe inner diameter (b) on the light guide (130) side. Rotation position detecting device (100) for a watch hand.

JP2016220405A 2016-11-11 2016-11-11 Rotational position detector of clock hand Pending JP2018077182A (en)

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