EP0766149A2 - Dispositif pour déterminer la position d'aiguilles indicatrices - Google Patents

Dispositif pour déterminer la position d'aiguilles indicatrices Download PDF

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Publication number
EP0766149A2
EP0766149A2 EP96115517A EP96115517A EP0766149A2 EP 0766149 A2 EP0766149 A2 EP 0766149A2 EP 96115517 A EP96115517 A EP 96115517A EP 96115517 A EP96115517 A EP 96115517A EP 0766149 A2 EP0766149 A2 EP 0766149A2
Authority
EP
European Patent Office
Prior art keywords
gear wheel
gear
light
openings
wheel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96115517A
Other languages
German (de)
English (en)
Other versions
EP0766149A3 (fr
EP0766149B1 (fr
Inventor
Reiner Dipl.-Ing. Häcker
Klaus Dipl.-Ing. Katzmann
Friedhelm Dipl.-Ing. Wieg
Eberhard Dipl.-Phys. Weisheit
Jürgen Dipl.-Phys. Zacharias
Hans Pilz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Helmut Hechinger GmbH and Co
Original Assignee
Helmut Hechinger GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27216084&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0766149(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE29515478U external-priority patent/DE29515478U1/de
Priority claimed from DE19632011A external-priority patent/DE19632011A1/de
Application filed by Helmut Hechinger GmbH and Co filed Critical Helmut Hechinger GmbH and Co
Publication of EP0766149A2 publication Critical patent/EP0766149A2/fr
Publication of EP0766149A3 publication Critical patent/EP0766149A3/fr
Application granted granted Critical
Publication of EP0766149B1 publication Critical patent/EP0766149B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
    • G04C3/14—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means incorporating a stepping motor

Definitions

  • the invention relates to a device for determining the position of pointers movable by means of a drive unit via gearwheels with a reflective light barrier having a light transmitter, a light receiver and at least one reflector element, with a first gearwheel projecting into the beam path of the reflex light barrier and having at least one opening, and with a evaluation unit downstream of the light receiver.
  • Devices for determining a pointer position by means of light barriers are known, for example, from German utility model G 88 12 431.2 and are used in conjunction with appropriately controlled stepper motors as a drive unit, in particular for mechanical displays in radio-controlled clocks.
  • the devices are designed such that only for a certain position of the gear wheels, i.e. for a certain step of the motor, light transmitter and light receiver of the light barrier are optically coupled. This arbitrary, but always detectable and thus reproducible gear position enables the assignment of a specific time display. As a result, starting from this basic position, it is possible to set the hands automatically and precisely even after a power failure or when the watch is started up for the first time.
  • German utility model G 94 18 446.1 a device is described in which three gear wheels have breakthroughs, light transmitter and light receiver on one Front of the wheels and a reflector element is firmly attached to the opposite side.
  • the light path is released or closed across all three gear wheels, with all three gear wheels taking up exactly one position with a clear light path.
  • the optical coupling between light transmitter and light receiver takes place with the inclusion of the stationary reflector element.
  • a corresponding evaluation circuit is provided to detect the optical coupling between light transmitter and light receiver.
  • the number of gears with openings can be reduced with the same accuracy.
  • a compact construction of the clockwork is achieved by installing the light transmitter and light receiver on the side. In the case of a reflex light arrangement with a rigid reflector element, the production outlay is lower, but additional space is required for attaching the reflector element.
  • the object of the invention is to provide a device for determining the position of pointers, which requires little manufacturing effort and enables a compact design.
  • the mechanical outlay is considerably reduced by a very simple design of the light barrier arrangement.
  • aperture openings with a larger diameter can be used, which is particularly advantageous with regard to the subsequent electronic evaluation unit.
  • an odd number of optical couplings are achieved with high certainty, which enables averaging.
  • a reflex light barrier with a light transmitter and a light receiver and at least one reflector element is provided in connection with a first gearwheel which projects into the beam path of the reflex light barrier and has at least one opening.
  • all reflector elements are arranged on a second gearwheel, with one of the openings in the first gearwheel and in each case one of the reflector elements in the second gearwheel providing optical coupling of the light transmitter and light receiver via the reflector element and the openings in certain positions of the gearwheels.
  • the light beam passes through the corresponding openings twice.
  • the further processing of signals emitted by the light receiver is carried out by an evaluation unit.
  • the openings are provided in the first gear wheel.
  • the openings are arranged in groups on an imaginary circular line concentric with the axis of rotation of the first gear wheel.
  • the position angles of the breakthroughs within a group are apart from certain ones Sliding angles are integer multiples of the smallest discrete step angle of the first gear wheel.
  • the arrangement of the openings in groups ensures that at least one of the openings is always aligned almost exactly to the center of the optical axis of the light barrier during the stepping movement and in different positions of the transmission. This position guarantees that an odd number of evaluable optical couplings during the sequence of steps is caused by at least one of the openings.
  • the grouping of the breakthroughs and the arrangement of the breakthroughs within a group are preferably used in generic devices, but can also be used in the same way in conjunction with light barriers which have light transmitters and light receivers which are located opposite one another or are arranged in some other way.
  • An increase in accuracy is also achieved in that both locally and functionally, i.e. at least one further gear wheel with at least one opening projecting into the beam path of the light barrier is arranged within the gear train, between the first and second gear wheel.
  • the size, shape and position of the further gear wheel and its openings can be designed such that only one pass through the openings of the first gear wheel per revolution of the second gear wheel leads to an optical coupling of the light transmitter and the light receiver. This enables a clear determination of the starting position.
  • the reflector element (s) in the second gearwheel is preferably designed as a shiny metal print. As a result, reflector elements are realized and positioned with little effort and high accuracy. In addition, this type of manufacture can be used in a simple manner, particularly in the case of frequently used plastic gear wheels.
  • the first gear wheel is coupled to the second hand and the second gear wheel is coupled to the minute hand.
  • the second gear wheel preferably has a reflector element and the first gear wheel has four openings formed as perforated apertures and arranged in a single group. Within the group, apart from defined displacement angles, the perforated diaphragms are arranged next to each other at an angle, preferably at 48 degrees, on a circular line concentric with the center of the gear wheel.
  • a further gear wheel protruding into the beam path has an opening designed as a slit diaphragm and is arranged both locally and functionally between the first and second gear wheels.
  • the evaluation circuit preferably forms, among other things, the average of the number of successive times at which an optical coupling takes place, and uses a gear step corresponding to the average as the starting position for setting the position of the gear wheels.
  • a gear is provided for a clockwork, which has a plurality of gears.
  • gear wheels These are gear wheels, the toothing and gear links with the drive toothing have been omitted in the drawing for the sake of clarity, so that only the wheel disks can be seen in each case.
  • a gear wheel rigidly connected to a shaft 14 serves as a second wheel 1, via which a gear wheel which is rigidly coupled to a shaft 13 concentric with the shaft 14 and is provided as a minute wheel 2 is driven.
  • a gear wheel provided as an intermediate wheel 3 both in the gear train and in terms of its spatial position.
  • the drawing also does not show that the shaft 14 is rigidly coupled with a second hand and the shaft 13 is rigidly coupled with a minute hand.
  • the intermediate wheel 3 is finally placed on a shaft 15.
  • a reflector element 12 is attached to the minute wheel 2 and is applied to the minute wheel 2 made of plastic by means of metal pressure.
  • the second wheel 1 contains four perforations 8a, 8b, 8c, 8d with a circular cross section, which are arranged in a group next to one another on an imaginary circular line 10 concentric with the axis of rotation of the shaft 14.
  • the intermediate wheel 3 also has an opening 11, which is designed as a slit diaphragm along part of the circumference of the intermediate wheel 3.
  • the angular position of minute wheel 2 and second wheel 1 is detected by means of an optoelectronic reflex coupler 4, its light transmitter 5 and its light receiver 6 being arranged in one plane.
  • the reflex coupler 4 forms a reflex light barrier in connection with the reflector element 12.
  • the optical axis 7 of the reflex coupler 4 extends from the center of the connecting line between the light transmitter 5 and the light receiver 6 perpendicular to the reflex coupler 4 and essentially parallel to the waves 13, 14 and 15 away from the reflex coupler 4.
  • a beam emanating from the light transmitter 5 passes through one of the four perforated apertures 8a, 8b, 8c, 8d - in the present exemplary embodiment through the perforated aperture 8a and the slotted aperture 11 and then meets the reflector element 12, from which the Light beam is in turn thrown back through the slit diaphragm 11 and the pinhole 8a to the light receiver 6.
  • the light receiver 6 detects whether the light beam emanating from the light transmitter 5 is reflected unhindered by the reflector element 12 and thus an optical coupling between the light transmitter 5 and the light receiver 6 has come about. If second wheel 1, minute wheel 2 and / or intermediate wheel 3 are not in the appropriate position, the light beam is interrupted, which is detected by the light receiver 6 accordingly.
  • An evaluation circuit 16 following the light receiver which among other things forms the average of successive coupling events, determines an initial position of the transmission from a gear step corresponding to this mean. This starting position is then based on an exact setting of the transmission corresponding to a predetermined value. Such a value is provided, for example, by a time signal receiver.
  • a stepper motor not shown in the drawing, can then suitably bring the gear into the desired position via the evaluation device 16.
  • the four aperture plates 8a, 8b, 8c, 8d which are arranged in a group along the imaginary circular line 10, have position angles 9a, 9b, 9c with one another. Apart from a well-defined displacement angle, these are integer multiples of the smallest discrete step angle of the seconds wheel 1.
  • the arrangement of the perforated diaphragms 8a, 8b, 8c, 8d relative to the toothing is not defined.
  • the displacement angles are determined by the mechanical tolerances of the individual Components and the gear assembly and determined by the size of the backlash of the gear wheels.
  • the shift angles are chosen as evenly distributed as possible between 0 ° and half the step angle of the second wheel 1 in the positive and negative directions.
  • the half step angle of the second wheel 1 is generally 3 °.
  • the step angle of 6 ° results from the angle of 360 ° for one revolution and 60 individual steps of the second wheel 1, each corresponding to one second.
  • "n" is an integer and the displacement angle ⁇ is exactly 0 ° for the aperture 8a, exactly + 1 ° for 8b, exactly -1 ° for 8c and either -2 ° or + 2 ° for 8d.
  • the individual displacement angles - ⁇ must always be less than 3 °.
  • This arrangement ensures that at least one of the perforated apertures 8a, 8b, 8c, 8d is always aligned approximately centrally to the optical axis 7 during the step movement and in different positions of the transmission. This position guarantees that an odd number of evaluable optical couplings during the step sequence is caused by at least one of the pinhole diaphragms 8a, 8b, 8c, 8d.
  • slit diaphragm (s) 11 on the intermediate wheel 3 it is achieved that optical coupling through one of the perforated diaphragms 8a, 8b, 8c, 8d is possible only once during a full revolution of the minute wheel 2.
  • the length of the slit diaphragm 11 must be chosen accordingly.
  • the second wheel 1, intermediate wheel 3 and minute wheel 2 must be arranged exactly to one another in the position in which the optical coupling occurs. Since these three wheels 1, 2, 3 are coupled via their toothings, the mounting position of the diaphragm system relative to one another and in relation to the optical axis 7 is retained except for the usual angular deviations, for example due to the backlash. This ensures a high reproducibility of the synchronous position, although the arrangement does not have a reflective light barrier that is exactly aligned with a gear step, as is usually the case.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromechanical Clocks (AREA)
  • Length Measuring Devices By Optical Means (AREA)
EP96115517A 1995-09-28 1996-09-27 Dispositif pour déterminer la position d'aiguilles indicatrices Revoked EP0766149B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE29515478U DE29515478U1 (de) 1995-09-28 1995-09-28 Drehwinkelerfassungseinrichtung für Zahnräder, insbesondere eines Funkuhrrädergetriebes
DE29515478U 1995-09-28
DE19612103 1996-03-27
DE19612103 1996-03-27
DE19632011 1996-08-08
DE19632011A DE19632011A1 (de) 1995-09-28 1996-08-08 Einrichtung zum Bestimmen der Position von Zeigern

Publications (3)

Publication Number Publication Date
EP0766149A2 true EP0766149A2 (fr) 1997-04-02
EP0766149A3 EP0766149A3 (fr) 1999-02-24
EP0766149B1 EP0766149B1 (fr) 2002-03-20

Family

ID=27216084

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96115517A Revoked EP0766149B1 (fr) 1995-09-28 1996-09-27 Dispositif pour déterminer la position d'aiguilles indicatrices

Country Status (4)

Country Link
US (1) US5734474A (fr)
EP (1) EP0766149B1 (fr)
JP (1) JPH09166671A (fr)
AT (1) ATE214815T1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100989245B1 (ko) 2007-09-28 2010-10-20 가시오게산키 가부시키가이샤 침위치검출장치 및 침위치검출장치를 구비한 전자기기

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6181423B1 (en) * 1998-10-06 2001-01-30 Jorge Uriarte Linear encoder providing engagement by engraving
JP3673416B2 (ja) * 1998-11-30 2005-07-20 リズム時計工業株式会社 自動修正時計
DE69942303D1 (de) * 1999-05-06 2010-06-10 Asulab Sa Uhr mit Mittel zur Ermittlung der Winkelstellung der koaxialen Zeiger einer analogen Anzeige
CN1132077C (zh) 1999-05-06 2003-12-24 阿苏拉布股份有限公司 包括用于指示同轴模拟显示指针之角度位置的装置的钟表
US20030063525A1 (en) * 2001-09-28 2003-04-03 Ken Richardson Microprocessor controlled quartz analog clock movement
EP1357448A1 (fr) * 2002-04-26 2003-10-29 Kienzle Time (Hong Kong) Limited Montre contrôlée par radio
TW558676B (en) * 2002-08-02 2003-10-21 Chih-Hao Yiu Device for detecting angular position
US20040125702A1 (en) * 2002-10-21 2004-07-01 Hideki Kitajima Rotational position detection device, hand position detection device and clock using the hand position detection device
US6804173B2 (en) * 2002-10-28 2004-10-12 Chih Hao Yiu Rotary members for timepiece having reflector sheets
JP2004184404A (ja) * 2002-11-21 2004-07-02 Seiko Instruments Inc 針位置検出装置及びこれを備えた電子時計
JP2004184405A (ja) * 2002-11-21 2004-07-02 Seiko Instruments Inc 針位置検出装置及びこれを用いた電子時計
US7154818B2 (en) * 2004-10-12 2006-12-26 Ele Gancy Tleleancy Co., Ltd. Radio controlled clock movement control system
JP4715176B2 (ja) * 2004-11-29 2011-07-06 セイコーエプソン株式会社 電子時計
JP4488049B2 (ja) * 2007-09-28 2010-06-23 カシオ計算機株式会社 針位置検出装置
JP4596002B2 (ja) * 2007-12-25 2010-12-08 カシオ計算機株式会社 針位置検出装置および針位置検出方法
JP4623140B2 (ja) 2008-05-28 2011-02-02 カシオ計算機株式会社 針位置検出装置および針位置検出制御方法
JP4730397B2 (ja) * 2008-05-30 2011-07-20 カシオ計算機株式会社 針位置検出装置
TW201925824A (zh) * 2017-12-01 2019-07-01 原相科技股份有限公司 用於可旋轉裝置定位之光學機構
US11175747B2 (en) * 2013-02-04 2021-11-16 Pixart Imaging Inc. Optical processing apparatus and operating method thereof

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US4358753A (en) * 1981-03-16 1982-11-09 Rockwell International Corporation High resolution shaft position encoder
JPS5981520A (ja) * 1982-10-30 1984-05-11 Shimadzu Corp 分光器スリツト機構
DE3429648A1 (de) * 1984-08-11 1986-02-13 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Lagemesseinrichtung
DE3513961A1 (de) * 1985-04-18 1986-10-23 Forschungsgesellschaft für Feingeräte-, Mikro- und Uhrentechnik e.V., 7000 Stuttgart Getriebestandserfassungseinrichtung bei einer elektronischen uhr insbesondere funkgesteuerte uhr
DE3828810A1 (de) * 1988-08-25 1990-03-01 Kienzle Uhrenfabriken Gmbh Vorrichtung zur anzeigestellungsdetektion fuer eine analoge elektronische uhr, insbesondere eine funkgesteuerte uhr
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100989245B1 (ko) 2007-09-28 2010-10-20 가시오게산키 가부시키가이샤 침위치검출장치 및 침위치검출장치를 구비한 전자기기

Also Published As

Publication number Publication date
ATE214815T1 (de) 2002-04-15
EP0766149A3 (fr) 1999-02-24
EP0766149B1 (fr) 2002-03-20
US5734474A (en) 1998-03-31
JPH09166671A (ja) 1997-06-24

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