Citizen Watch Company, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Tadao Enomoto

Hiroshi Koide

Nobuo Ito

Hidefumi Kasai

Toshio Murata

Masataka Matsumoto

Norio Hashimoto

Tsutomu Noguchi

Hachiro Kushida

Hideo Taguchi

Michihiro Iwamura

Junichi Nishikawa

Eiichi Kitabayashi

Atsushi Takemura

High strength titanium alloy, product made of the titanium alloy and

A structure comprising a watch case; a pair of lugs each extending from the watch case and having an upper surface in a lower position than the upper surface of the watch case; a band; and a connector secured to the underside of the end portion of the band, the band being closely attached to the watch case by placing the end of the band on the upper surfaces of the lugs and tightening cone point screws into threaded holes provided near distal ends of the sides of the lugs so that the cone points of the screws hold firmly a pair of attachment openings provided in said connector against the watch case.

Watch case and band attachment structure

A timepiece display component such as hands and dial plates, which component comprises a first electroformed metal layer having an internal compressive stress, and a second electroformed metal layer formed over said first electroformed metal layer and including an internal tensile stress, such that the internal stresses of the first and second metal layers cancel each other out to reduce the amount of warping distortion in the display component.

Method of manufacturing a timepiece component

A method of manufacturing components of a timepiece dial, such as timekeeping hands and dial plates, whereby these components can be made extremely thin, while warping is held to a very low level even if the component is subjected to machining operations. The method is based upon utilizing a plurality of electroformed metal layers having different types of internal stress, i.e. compressive or tensile, developed within

A method of manufacturing a timepiece hand is disclosed, whereby the hand can be made extremely thin and lightweight, as well as strong and rigid. The timepiece hand is in the form of an open shell formed of hard nickel electro-forming. Because a minimum of mechanical working is performed upon the hand during the manufacturing process, bending distortion of the hand is avoided, and such a hand can be made substantially thinner than has been possible with manufacturing methods of the prior art.

Timepiece hand manufacturing method

A dial plate or masking plate for a timepiece, having a pattern formed on a surface of the dial plate by embossing with a mold formed of a hard metal by an electroforming process.

Decorative plate for a timepiece

An illuminating device provided adjacent the liquid crystal display device of an electronic timepiece having a light emitting element composed of tritium (.sup.3 H). The light emitting element is sealed with a resin without hydrogen atoms, such as chlorotrifluoroethylene resin or polytetrafluoroethylene for preventing the leakage of 3H of tritium.

Display device for electronic timepieces

An electronic watch construction which comprises a casing, a watch glass supported by the casing, a module fixedly held in the casing and having a recess facing the watch glass, and a liquid crystal display cell at least a portion of which is disposed in the recess of the module, the display cell being fixedly mounted on one side of the module. An illumination device is disposed in the recess of the module below the liquid crystal display cell to illuminate the liquid crystal display cell.

Growing community of inventors

Tanashi, Japan

Tadao Enomoto