Title:
【発明の名称】アナログ表示式クオーツ時計における時計針の零点位置検出方法と装置および該装置を具えた時計
Document Type and Number:
Japanese Patent JP3204506
Kind Code:
B2
Abstract:
The device for performing the method for detecting the zero position of a hand of a quartz watch with analogue display enables a beam of light to be generated and directed onto a reflective surface integral with a moving part bearing the hand, the reflected beam to be received on a detector and the position for which the output signal of the detector is maximal to be determined to make it correspond to the zero position of the hand when assembling the watch. This device comprises a source (1) emitting a beam of light (2) and a receiver (3) which intercepts the reflected beam (4) returned by a very reflective area (5). This area is integral with a surface of a moving part (6), for example the wheel bearing the second hand and, depending on the position of this wheel, the reflective surface may occupy a position (5) or an adjacent position (5') staggered by less than one step. The signals from the detector (3) are transmitted to an electronic ciruict (7) connected to an electric motor ( 8) which drives the moving body (6) by means of a train of wheels (9).
Inventors:
Rene Besson
Claude Eric Lohenberger
Claude Eric Lohenberger
Application Number:
JP29871990A
Publication Date:
September 04, 2001
Filing Date:
November 02, 1990
Export Citation:
Assignee:
Monterey Rolex Society Anonymous
International Classes:
G04C3/00; G04C3/14; G04C9/00; G04D7/00; (IPC1-7): G04C3/00; G04C9/00
Domestic Patent References:
| JP63243814A | ||||
| JP58150881A | ||||
| JP54118872A | ||||
| JP5547834B2 | ||||
| JP3514290B1 |
Attorney, Agent or Firm:
Ichiro Sugawara