Seiko Instruments Inc

Takuma Kawauchiya

Takashi Niwa

Masahiro Nakajima

Masayuki Koda

Hisashi Fujieda

Manabu Shinke

A timepiece is equipped with a movement, a timepiece case accommodating the movement, and a hollow tubular structure portion having a connection proximal portion directly or indirectly in contact with the movement. The hollow tubular structure portion is formed such that a space defined between itself and the timepiece case is hermetically sealed. The inner space of the hollow tubular structure portion communicates with the exterior of the timepiece case via an external opening of the timepiece case. The timepiece can secure a sufficient waterproof performance and can transmit sound from a sound source efficiently to the exterior.

Timepiece

To provide an operation stabilizing mechanism, a movement, and a mechanical timepiece allowing a reduction in size while achieving an enhancement in rate precision. An operation stabilizing mechanism includes: an outer carriage and an inner carriage provided so as to be mutually rotatable; a constant-force spring provided between the outer carriage and the inner carriage and configured to impart a rotational force to the inner carriage such that the inner carriage rotates with respect to the outer carriage; a stop wheel provided on the outer carriage; and a stopper configured to perform engaging and releasing operations on the stop wheel upon the rotation of the inner carriage, wherein the rotational axis of the outer carriage and the rotation axis of the inner carriage cross each other.

Operation stabilizing mechanism, movement, and mechanical timepiece

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

A balance includes a balance staff pivotally supported rotatably and a balance wheel arranged around the balance staff. The balance wheel has one end portion fixed to a connection arm radially connected to the balance staff and a free end portion configured to be radially deformed. The balance wheel has a first rim connected to the connection arm and a second rim in overlapping relation with the first rim and formed of a material having a linear expansion coefficient different from the first rim. The first and second rims are arranged in a circumferential direction and are bonded together by melting portions formed of melted materials of the first and second rims. The melting portions are formed on upper and lower surfaces of and in an intermediate position between the first and second rims.

Balance, timepiece movement, timepiece and manufacturing method of balance

An operation stabilization mechanism has a first carriage to which a rotational drive force of a train wheel is transmitted and which is rotatably supported with respect to a main plate, and a second carriage rotatably supported with respect to the first carriage. A constant-force spring is provided between the first carriage and the second carriage and is configured to impart a rotational force to the second carriage so that the second carriage undergoes rotation with respect to the first carriage. An escapement/governor mechanism is mounted in the second carriage and is configured to be driven by a rotational torque generated through rotation of the second carriage and transmitted to the escapement/governor mechanism. A stopper lever is mounted to undergo rotational movement relative to the first carriage for suppressing fluctuations in the rotational torque transmitted to the escapement/governor mechanism.

Operation stabilization mechanism, movement, and mechanical timepiece

To provide a timepiece balance with hairspring capable of changing the moment of inertia of the balance wheel without involving generation of a one-sidedness in weight. There is provided a balance with hairspring including a balance staff, and a balance wheel arranged around the balance staff, wherein there are provided a first rim constituting the balance wheel and having a guide portion configured to vary in the distance from the balance staff in correspondence with a peripheral direction around the balance staff, an elastic portion arranged so as to be slidable along the guide portion and capable of elastic deformation in the radial direction around the balance staff, and a second rim having a plurality of weight portions arranged in the peripheral direction.

Balance with hairspring, movement, and timepiece

There are provided a constant force device, a movement, and a mechanical timepiece which can decrease a loss of power for controlling rotation of a stop wheel & pinion. A constant force device includes an inner carriage that outputs an output torque by being rotated around a tenon of a first inner rotation body and a tenon of a second inner rotation body, a constant force spring that supplies a rotation force to the inner carriage, an outer carriage that stores a resilient force in the constant force spring by being rotated around a tenon of a first outer rotation body and a tenon of a second outer rotation body, a stop wheel & pinion that is supported to be rotatable around a stop wheel axle body in the outer carriage, and that is rotatable around the tenon of the first outer rotation body and the tenon of the second outer rotation body, and a stopper that is rotated around the tenon of the first inner rotation body and the tenon of the second inner rotation body together with the inner carriage, and that engages with the stop wheel & pinion in response to rotation of the stop wheel & pinion which is rotated around the stop wheel axle body.

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Chiba, Japan

Takuma Kawauchiya