Kabushiki Kaisha Suwa Seikosha

Akio Shimoi

Yoshikazu Kawamura

Kikuo Oguchi

Yuichiro Iwai

Toshiaki Ogata

A touch sensitive input particularly suited for use with an electronic wristwatch, an electronic calculator or a combination thereof is provided. The touch sensitive input includes a touch sensitive contact connected to the input of a detector circuit, the detector circuit input being normally referenced to a first potential for producing a detector circuit output signal representative of the first potential. Engagement of the touch sensitive contact selectively references the detector circuit input to a second potential and in response thereto produces a detector circuit output signal representative of the second potential. The detector circuit includes at least an MOS or C-MOS input stage. Additional circuitry is provided for eliminating chatter in the output signal produced by the input stage, for preventing the producing of two signals representative of the unintended engagement of more than one touch sensitive contact, and for providing an indication that a touch sensitive contact has been inadvertently engaged.

Touch sensitive input for electronic wristwatch and/or electronic

A digital display electronic wristwatch including a quartz crystal high frequency time standard having a natural frequency in the MHz range is provided. The quartz crystal time standard is incorporated into an oscillator circuit that produces a high frequency time standard signal having the same frequency as the frequency of vibration of the time standard. A divider circuit is formed from a plurality of series-connected divider stages and produces a low frequency reference signal in response to the time standard signal. Series-connected counters are coupled to the divider to produce time-keeping signals in response to the low frequency reference signal being applied thereto, and digital display elements are adapted to display time in response to the time-keeping signals produced by the respective series-connected counters.

Digital display electronic wristwatch

An electronic wristwatch having calculator circuitry operated by the time standard signals utilized to operate the timekeeping circuitry is provided. The electronic wristwatch includes a timing pulse generating circuit for producing a plurality of signals. Timekeeping circuitry is coupled to the timing pulse time standard signals produced thereby, for producing a plurality of timekeeping signals representive of actual time in response to at least one of the time standard signals being applied thereto. A digital display is provided for displaying actual time in response to at least some of the plurality of timekeeping signals being applied thereto. Calculator circuitry is provided for producing calculation signals representative of numerical information or a calculating function in response to receiving at least two of the time standard signals produced by the timing pulse generator means, the digital display being adapted to display the numerical information and calculating function in response to the calculating signals produced by the calculating circuitry being applied thereto.

Electronic wristwatch

An improved digital display driving circuit is provided. The display includes first and second display digits, the first display digit and second display digit being respectively formed by a plurality of segment electrodes, at least one digit electrode spaced apart from the segment electrodes and material disposed between the segments electrode and the digit electrode. Regions of the material are adapted to be rendered visually distinguishable from adjacent regions by the application of an electric field across the region. The regions of the material in registration with the segment electrodes are rendered visually distinguishable in response to a predetermined potential difference being applied across any one of the respective spaced apart segment electrodes and the digit electrodes. The invention is characterized by the first digit electrode and second digit electrode being referenced during alternating driving intervals of time to a potential such that the regions of the material in registration therewith are prevented from being rendered visually distinguishable. Each of the segment electrodes forming the first digit are coupled to a corresponding segment electrode forming the second digit to define a plurality of segment electrode pairs. A memory includes a plurality of outputs coupled to each pair of segment electrodes to reference each pair of electrodes to one of a first drive potential and second drive potential to be compared during each driving interval of time with the potential of the respective digit electrodes spaced apart therefrom, and a shift register adapted to receive a drive signal and in response thereto write-in the drive signal to the memory prior to each driving interval of time.

Digital display driving circuit

A flexural mode quartz crystal vibrator formed from a quartz crystal plate having first and second opposed substantially planar surfaces, with a plurality of electrodes on at least one side thereof, is provided. The vibrator is characterized by the placement of electrodes on at least one of the opposed surfaces of the quartz crystal plate, the placement of the electrodes providing a vibrator having a thickness of 0.5 mm or less.

Quartz crystal vibrator

A flexural mode quartz crystal vibrator formed from a quartz crystal plate having first and second opposed substantially planar surfaces, with a plurality of electrodes on both said surfaces is provided. The vibrator is characterized by the placement of electrodes on both of the opposed surfaces so that the electrodes on each surface do not overlap each other.

Growing community of inventors

Suwa, Japan

Akio Shimoi