Seikosha Co., Ltd.

Isato Watanabe

Satoru Stephen Yamauchi

Tsuyoshi Hayakawa

Isao Kondo

Junichi Aizawa

Hidetsugu Ikeda

Shoichiro Kumazawa

Kouichi Miyagi

A timepiece has rotatable hour, minute and second hands each carrying an energizeable element. Electric power is supplied to the elements carried by the hour and minute hands through sliding contacts and is supplied to the element carried by the second hand through electromagnetically coupled coils. The drive torque applied to the hour and minute hands is greater than that applied to the second hand and easily overcomes the frictional drag associated with the sliding contacts. The lower drive torque applied to the second hand may not be sufficient to overcome the frictional drag associated with sliding contacts and to avoid this problem, electromagnetically coupled coils instead of sliding contacts are used to supply electric power to the element carried by the second hand.

Electric power supply device for hand with load

A power supply device for a hand with a luminescence element which is adapted to supply electric power to the luminescence element mounted on the hand.

Power supply device for hand with luminescence element

A timepiece comprises a display including a light emitting element. A detector detects ambient light around the timepiece and a switch is switchable into first and second operating modes. When the switch is in the first mode the light emitting element is illuminated at a first brightness level when the detected ambient light is below a predetermined level and the light emitting element is not illuminated when the detected ambient light is above the predetermined level. When the switch is in the second mode, the light emitting element is illuminated at a second brightness level which is greater than the first brightness level.

Timepiece with light emitting device

A power supply system for luminous hands wherein an hour and a minute hand have electroluminescence elements and a second hand has a light-emitting diode. The power supply system comprises a drive signal generator for generating a mixed signal consisting of a high-frequency signal and a low-frequency signal. An hour hand brush conductor between a fixed member and the hour hand receives the mixed signal. An hour hand filter passes only the low-frequency signal and sends it to the electroluminescence element of the hour hand. A minute hand brush conductor device placed between the hour hand and the minute hand receives the mixed signal from said hour hand brush conductor device. A minute hand filter passes only the low-frequency signal of the mixed signal and sends the low-frequency signal to the electroluminescence element of the minute hand. A rotary transformer between the minute hand and the second hand transfers the mixed signal from the minute hand brush conductor device to the light-emitting diode of the second hand. When the second hand alternatively has an electro-luminescence element, a converter is provided to convert the high-frequency signal to a low-frequency signal and send this low-frequency signal to the electroluminescence element of the second hand.

Power supply system for luminous hands

A circuit unit including a plurality of lead frames which are made of a metal sheet and one of which is used for die-bonding an integrated circuit. The die-bonding lead member is formed to have at least a generally H-shaped portion constructed of a pair of parallel side portions and a connecting portion for connecting the two side portions for die-bonding the integrated circuit thereto. The remaining lead members are separated from said die-bonding one and have individual end portions positioned in the vicinity of the integrated circuit and connected electrically therewith by means of bonding wires. The die-bonding lead member and the remaining lead members are integrated either with a potting resin for protection the integrated circuit or with the potting resin and/or an insulating plate backing the potting resin. The aforementioned two side portions are fixed on a holding member. Also disclosed is a process for fabricating the aforementioned circuit unit.

Circuit unit for timepiece and process for fabricating the same

A method of connecting a coil as mounted in an electric watch or clock in which a lead wire of the coil is made to cross a conductor near the terminal portion of the coil. The lead wire is drawn so as to traverse beyond a conductor to which it is to be attached, and the lead wire is anchored by an anchoring device so as to hold it against the conductor. The lead wire is then bonded to the conductor at the point of traverse.

Growing community of inventors

Tokyo, Japan

Isato Watanabe