A detection device including a device main body provided with a light receiving hole corresponding to a light receiving element and a light emitting hole corresponding to a light emitting element, and a waterproof member arranged between an outer circumferential surface of a cover arranged in the light receiving hole or the light emitting hole and an inner circumferential surface of the light receiving hole or the light emitting hole.

A detection device including a device main body provided with a light receiving hole corresponding to a light receiving element and a light emitting hole corresponding to a light emitting element, and a waterproof member arranged between an outer circumferential surface of a cover arranged in the light receiving hole or the light emitting hole and an inner circumferential surface of the light receiving hole or the light emitting hole.

A case including a case member having a back cover attached thereto, and a cover member which is arranged on a side of the back cover opposite to the case member side while covering an outer circumferential surface of the case member and on which band attachment sections are provided corresponding to the outer circumferential surface of the case member.

A water-resistant watch case of a diving watch, includes at least one back mounted on a lower side of a middle part, and a crystal mounted with a fastening gasket on an upper side of the middle part. The back includes an annular bearing surface for coming into contact with an inner annular surface of the middle part of a shape complementary to the bearing surface during mounting of the back on the middle part. The annular bearing surface and the inner annular surface are inclined towards the inside of the watch case at a determined angle less than 90° relative to a central axis perpendicular to a plane of the watch case so as to distribute stresses between the back and the middle part due to the water pressure during a dive. The annular bearing surface and the inner annular surface are conical in shape.

A water-resistant watch case of a diving watch, includes at least one back mounted on a lower side of a middle part, and a crystal mounted with a fastening gasket on an upper side of the middle part. The back includes an annular bearing surface for coming into contact with an inner annular surface of the middle part of a shape complementary to the bearing surface during mounting of the back on the middle part. The annular bearing surface and the inner annular surface are inclined towards the inside of the watch case at a determined angle less than 90° relative to a central axis perpendicular to a plane of the watch case so as to distribute stresses between the back and the middle part due to the water pressure during a dive. The annular bearing surface and the inner annular surface are conical in shape.

A water-resistant watch case of a diving watch, includes at least one back mounted on a lower side of a middle part, and a crystal mounted on an upper side of the middle part. The crystal includes an annular peripheral surface to be fastened with an amorphous metal gasket on an inner annular surface that is complementary in shape, on the upper side of the middle part. The annular peripheral surface of the crystal is inclined towards the inside of the watch case at a determined angle less than 90° relative to a central axis perpendicular to a plane of the watch case to distribute stresses between the crystal and the middle part due to the water pressure during a dive. The annular peripheral surface and the inner annular surface are conical in shape.

A water-resistant watch case of a diving watch, includes at least one back mounted on a lower side of a middle part, and a crystal mounted on an upper side of the middle part. The crystal includes an annular peripheral surface to be fastened with an amorphous metal gasket on an inner annular surface that is complementary in shape, on the upper side of the middle part. The annular peripheral surface of the crystal is inclined towards the inside of the watch case at a determined angle less than 90° relative to a central axis perpendicular to a plane of the watch case to distribute stresses between the crystal and the middle part due to the water pressure during a dive. The annular peripheral surface and the inner annular surface are conical in shape.

A display apparatus includes the following. A protecting plate is formed of a material which transmits light. A light transmitting plate is positioned below the protecting plate and is positioned in contact with the protecting plate. A display is provided below the light transmitting plate and includes a display region which can be viewed from outside. An air layer is positioned between the light transmitting plate and the display. A light reflection prevention layer is provided on at least one of a surface of the light transmitting plate facing the air layer and a surface of the display facing the air layer. The protecting plate, the light transmitting plate, the display, the air layer, and the light reflection prevention layer are layered in a thickness direction of the protecting plate. A region in the protecting plate overlapped with the display region of the display includes a window with which waterproof inspection is performed.

A display apparatus includes the following. A protecting plate is formed of a material which transmits light. A light transmitting plate is positioned below the protecting plate and is positioned in contact with the protecting plate. A display is provided below the light transmitting plate and includes a display region which can be viewed from outside. An air layer is positioned between the light transmitting plate and the display. A light reflection prevention layer is provided on at least one of a surface of the light transmitting plate facing the air layer and a surface of the display facing the air layer. The protecting plate, the light transmitting plate, the display, the air layer, and the light reflection prevention layer are layered in a thickness direction of the protecting plate. A region in the protecting plate overlapped with the display region of the display includes a window with which waterproof inspection is performed.

A watch case having a locking system for at least one control element of a timepiece, the locking system including a manipulable element, a locking element for the at least one control element, and a kinematic link linking the manipulable element to the locking element, the locking system being arranged on the outside of a chamber (63), more particularly on the outside of a water-resistant chamber, defined by the case, the locking element being rotatably mounted, more particularly rotatably mounted about a second axis (A1) of the at least one control element.