Citizen Watch Company, Ltd.

Tatsuo Nitta

Tomomi Murakami

Hiroyuki Kihara

Ryoji Iwakura

Norio Miyauchi

Kazutoshi Takahashi

Hitoshi Itakura

Toshio Umemoto

Tadashi Yasuoka

Kazuya Mitaki

Nobuhiro Satoh

Yuiti Hasumi

A small electronic equipment with a vibration alarm has, as a drive source, a flat stator type bipolar stepping motor, which has a rotor having high durability, can be assembled easily, requires low power consumption, is started constantly stably, and can be rotated at a high speed. In this electronic equipment with the vibration alarm, a rotor ( ) is rotated by a rotary drive system including a drive pulse generating means ( ), a drive circuit ( ), a flat stator ( ), a counter electromotive voltage detection coil ( ), and a magnetic pole position detection means ( ), so that an eccentric weight ( ) fixed to the rotor is rotated, thereby generating vibration. The drive pulse generating means outputs a pulse signal for driving the stepping motor on the basis of an alarm signal output at alarm time. The drive circuit supplies a drive current to a drive coil ( ) on the basis of the pulse signal from the drive pulse generating means. The flat stator transmits the magnetomotive force generated in the drive coil to the rotor ( ). The counter electromotive voltage detection coil detects a counter electromotive voltage generated by rotation of the rotor. The magnetic pole position detection means detects the magnetic pole position of the rotor ( ), which is rotating, with respect to the flat stator ( ) on the basis of the counter electromotive voltage generated in the counter electromotive voltage detection coil, and outputs, to the drive pulse generating means, a detection signal for controlling the output timing of the pulse signal supplied from the drive pulse generating means ( ).

Electron equipment

A device includes: a communication device case,having therein a display panel,supported by a support frame,and a circuit board,stacked with a battery,and electrically connected to the battery,and an antenna,housed in the communication device case,the antenna having a first conductor portion,formed in a ring, a second conductor portion,opposed to the first conductor portion,at a predetermined interval, and a third conductor portion,for electrically connecting the first conductor portion,and the second conductor portion,And a communication module assembly,is formed by disposing a communication device module in the antenna,the communication device module including the circuit board and the support frame. And the first conductor portion,of the antenna,in the communication device module assembly is positioned on a side of the circuit board,opposite to the support frame and outward, and the second conductor portion,is positioned on a side of the support frame,opposite to the circuit board and outward. As a result, the conductor portion of the antenna is positioned in an outermost portion of the communication device module. Therefore, the dimension of strap in the thickness direction and the dimension of the communication device case in the plane direction can be set to small values, respectively. In addition, favorable feeling of wearing the communication device can be obtained, and the size of the communication device as a whole can be made small.

Wristwatch-type communication device and antenna therefor

A small electronic equipment with a vibration alarm has, as a drive source, a flat stator type bipolar stepping motor, which has a rotor having high durability, can be assembled easily, requires low power consumption, is started constantly stably, and can be rotated at a high speed. In this electronic equipment with the vibration alarm, a rotor (1) is rotated by a rotary drive system including a drive pulse generating means (112, 113, 114), a drive circuit (110), a flat stator (6), a counter electromotive voltage detection coil (306), and a magnetic pole position detection means (107, 115, 116), so that an eccentric weight (2) fixed to the rotor is rotated, thereby generating vibration. The drive pulse generating means outputs a pulse signal for driving the stepping motor on the basis of an alarm signal output at alarm time. The drive circuit supplies a drive current to a drive coil (305) on the basis of the pulse signal from the drive pulse generating means. The flat stator transmits the magnetomotive force generated in the drive coil to the rotor (1). The counter electromotive voltage detection coil detects a counter electromotive voltage generated by rotation of the rotor. The magnetic pole position detection means detects the magnetic pole position of the rotor (1), which is rotating, with respect to the flat stator (6) on the basis of the counter electromotive voltage generated in the counter electromotive voltage detection coil, and outputs, to the drive pulse generating means, a detection signal for controlling the output timing of the pulse signal supplied from the drive pulse generating means (114).

Electronic equipment with vibration alarm

Electronic equipment with depth measuring function

A device for measuring altitude and barometric pressure having a barometric pressure sensor, an amplifying circuit for amplifying the output signal from the pressure sensor, an analog to digital converter for converting the output signal from the amplifying circuit to a digital signal, and an altitude information generator for generating altitude information from the output signal of the analog to digital converter. A display displays the altitude information from the altitude information generator and the pressure information detected by the pressure sensor with pressure variation information and converts it into precise altitude information in accordance with temperature compensation data and altitude compensating data based upon regional and time information. The device may be used in climbing or the like with remarkable reliability.

Device for measuring altitude and barometric pressure

An electronic timepiece in which an operating state of a timepiece circuit is controlled by a control circuit composed of a counter responsive to clock pulses from the timepiece circuit, a digital/analog converter for converting a digital output signal from the counter to an analog output signal, a potentiometer adapted to generate an analog input signal, and a comparator for comparing the analog output signal and the analog input signal to generate an output signal which is applied to the counter to control the same by which a control signal is generated to control the operating state of the timepiece.

Electronic timepiece with gain/loss adjustment

An electronic timepiece equipped with calendar display means adapted to be driven by a drive motor means provided independently of a drive motor means adapted for driving time indicating hands. The drive motor means for driving the calendar display means is driven by a drive system which comprises a calendar memory circuit responsive to a reference signal, i.e., a 00:00 AM signal indicative of midnight, to update the content of the calendar memory circuit, a drive signal setting circuit coupled to said calendar memory circuit and generating a calendar information signal in response to the content of said calendar memory circuit, and a driver circuit responsive to said calendar information signal to generate a drive signal for energizing said drive motor means for driving said calendar display means.

Electronic timepiece

An electronic timepiece equipped with a differentiation carry inhibit circuit arranged to allow a carry operation due to a carry signal produced by a time counter in response to a time unit signal when the timepiece remains in a time correction mode and inhibit a carry operation due to a carry signal arising from a correction signal produced by actuation of a correction switch.

Growing community of inventors

Kawagoe, Japan

Tatsuo Nitta