Seiko Instruments Inc

Hisashi Fujieda

Takashi Niwa

Masahiro Nakajima

Shigeo Suzuki

Shigeki Yagi

Masayuki Koda

Takuma Kawauchiya

Fumiyoshi Nagakura

Hiroyuki Konishi

Akiko Asahata

Masaji Kondo

Manabu Shinke

A temperature compensation-type balance includes a balance staff, and a balance wheel having a plurality of bimetal portions disposed in parallel to each other in a circumferential direction around a rotation axis of the balance staff. Connection members connect respective ones of the plurality of bimetal portions and the balance staff. Each bimetal portion is a layered body in which a first member and a second member are radially overlapped, and one end portion in the circumferential direction is a fixed end connected to a respective connection member and the other end portion in the circumferential direction is a free end. The first member is formed of a ceramic material, and the second member is formed of a metal material having a thermal expansion coefficient different from that of the first member.

Temperature compensation-type balance, timepiece movement, mechanical timepiece and manufacturing method of temperature compensation-type balance

An object is to provide an escapement which can improve energy transmission efficiency, a timepiece movement including the escapement, and a timepiece including the timepiece movement. There is provided an escapementincluding an escape wheel, a double rollerthat is disposed in a balancepivotally moving around a balance staff, and a pallet forkthat can pivotally move around a pallet staff. The double rollerincludes a first impulse pinwhich comes into contact with the pallet forkin response to a pivotal movement of the double rollerand causes the pallet forkto pivotally move around the pallet staff, and a second impulse pinwhich can come into contact with tooth portionof the escape wheel. The pallet forkincludes two pallets of an entry palletand an exit pallet

Escapement, timepiece movement and timepiece

The present invention aims to provide a bearing structure allowing direct adjustment between itself and an opposing bearing even after assembly and a watch equipped with the same. A bearing structure of a watch rotatably supports a forward end portion of a shaft of a wheel with respect to a base body, and includes: a bearing, a bearing support body supporting the bearing and having a male screw portion on an outer peripheral surface concentric with the shaft of the wheel, and an adjustment nut equipped with a female screw portion threadedly engaged with the male screw portion of the bearing support body, regulated in its displacement in the extending directions of the shaft of the wheel by the base body, and adapted to adjust the position of the bearing with respect to the extending direction of the shaft via the bearing support body.

Bearing structure and watch equipped with the same

The switch structure according to the present invention is obtained by interposing an elastic connection member between the circuit board provided with electrodes and a push switch fixed to a case of an electronic device. The elastic connection member has a structure in which conductive layers and insulation layers are alternately laminated. The conductive layers of a first lamination layer surface on which the conductive layers and the insulation layers of the elastic connection member are exposed abut against the electrodes so that the electric connections therebetween are established. The push switch is pushed down, and a contact portion thereof abuts against the plurality of conductive layers on a second lamination layer surface, whereby the electrodes are in a conductive state. Even if the push switch is pushed strongly, the elastic connection member deforms to absorb the force. As a result, the switch structure which hardly breaks is obtained.

Switch structure and electronic device

Growing community of inventors

Chiba, Japan

Hisashi Fujieda