Citizen Watch Company, Ltd.

Kisuke Watanabe

Hiroshi Koide

Tsuneji Takasugi

Masahiko Waki

Osamu Matsumura

Yasuo Maekawa

Hisao Yamagata

Tsunetoshi Sekiguchi

A structure for fixing a watchglass of a watch case, which comprises a watchglass fixing member having a ring-shaped recess and a flange formed at an upper portion of said recess, a watchglass having an outer diametric surface formed with an inclined guiding surface below said outer diametric surface, and a synthetic resin ring disposed in said recess of said watchglass fixing member and sandwiched between said recess and said watchglass and having a protrusion formed when said watchglass is press fitted into said synthetic resin ring, said protrusion serving as means for retaining said watchglass in a fixed place.

Watchglass fixing structure

A method for the fabrication of a decorative panel having a coarse, enlarged crystalline pattern characterized by applying a large rolling force at a draft ratio in excess of the critical draft ratio to a metal sheet; annealing the metal sheet at a temperature in excess of the recrystallization temperature in order to remove deformations caused by the rolling step; applying a prescribed pattern-like strain figures thereto; annealing the metal sheet in an anti-oxidizing atmosphere at a high temperature in excess of the recrystallization temperature in order to allow coarse, enlarged crystals to form; and subsequently etching the surface of the sheet.

Process for fabrication of decorative panel

Growing community of inventors

Tokyo, Japan

Kisuke Watanabe