Casio Computer Co., Ltd.

Kazuma Kobayashi

Junichi Sato

Yoshihiro Maruyama

Hajime Iguchi

Kenichi Inoue

Junichiro Suzuki

Shouta Nagasawa

Chinfu Liu

Wuchien Liu

Tienchai Lin

Weipin Kao

Chieko Tajima

Masao Amano

Kazumasa Yokoo

The present disclosure relates to a titanium or titanium alloy member and to a surface hardening method for the titanium or titanium alloy member. The titanium or titanium alloy member includes a base material of titanium or titanium alloy, and at a surface of the base material, a hardened layer formed by diffusion of oxygen into the surface.

Alloy member and method for hardening surface thereof

A timepiece includes: a casing; a light transmission part; a function part; and a glue adhering the light transmission part to the casing. The casing includes: a projection projecting from an inner circumferential surface and extending along a circumferential direction; and a protrusion protruding from the inner circumferential surface and determining a position of the light transmission part. A lateral surface of the light transmission part is adhered to the inner circumferential surface. A peripheral part of a bottom surface of the light transmission part is adhered to a top surface of the projection. An outer circumferential surface of the function part extends along an inner surface of the projection. A space is present in a facing region where the projection faces the function part along the light transmission part. The space is wider in a specific section including the protrusion than in a section different from the specific section.

Timepiece and timepiece case

The present disclosure relates to a titanium or titanium alloy member and to a surface hardening method for the titanium or titanium alloy member. The titanium or titanium alloy member includes a base material of titanium or titanium alloy, and at a surface of the base material, a hardened layer formed by diffusion of oxygen into the surface. The method includes: a heating step of heating the titanium or titanium alloy base material of the member to a predetermined temperature under an inert gas atmosphere; a hardening step of introducing (i) a mixed gas including an inert gas, and (ii) oxygen gas as a hardening treatment gas, to perform hardening treatment of the surface of the base material; and a cooling step of cooling the base material down to room temperature under the inert gas atmosphere.

A dial including: a rotating body which is provided to be rotatable; and a dial main body which includes a covering section that covers a peripheral portion of the rotating body.

Dial and timepiece

A method of manufacturing a decorative member, including: molding a base with a mold having a transferring surface, the transferring surface having a recessed area and the other area, the recessed area and the other area having different surface roughnesses in the base in a finished state; and treating a surface of the base molded by the transferring surface of the mold under a single condition.

Method of manufacturing decorative member, decorative member, and timepiece

A watch case having a through-hole, an operating member including an operating shaft to be inserted to the through-hole of the watch case, an exterior member mounted on the operating member and configured to be displaced in a shaft direction of the operating shaft and be rotated together with the operating member, and a buffer member located between the operating member and the exterior member are provided. Therefore, when the exterior member receives impact from outside, the impact can be buffered by the buffer member. As a result, the operating member can be prevented from being damaged because the impact from the outside is not directly transmitted to the operating member, thereby improving impact resistance.

Switch device and timepiece

A wristwatch including a case including a band attachment section having an attachment hole, a band including a coupling hole in one end portion located coaxially with the attachment hole of the band attachment section, a coupling member inserted into the coupling hole of the band and the attachment hole of the band attachment section and coupling the band with the band attachment section, and a fixing member fixing the coupling member to the attachment hole of the band attachment section or the coupling hole of the band.

Wristwatch

A structure includes a wristwatch case; an inner frame arranged inside the wristwatch case and having an upper surface provided with a positioning fitting recess; a timepiece module arranged as being positioned inside the inner frame; and a parting plate which is provided with a positioning pin that is provided on a lower surface of the parting plate facing the upper surface of the inner frame, and that is fitted into the positioning fitting recess of the inner frame, thereby positioning the parting plate with respect to respect to the inner frame. As a result, in a state where the timepiece module is arranged and positioned inside the inner frame arranged in the wristwatch case, the positioning pin of the parting plate can be fitted into the positioning fitting recess of the inner frame. Accordingly, the parting plate can be accurately positioned with respect to the inner frame.

Growing community of inventors

Fuchu, Japan

Kazuma Kobayashi