Citizen Watch Company, Ltd.

Becton Dickinson and Company Limited

Toyoharu Fujikawa

Yasuhiko Nishikubo

Shingo Ichikawa

Tim H Gordon

Shotaro Shimizu

Louis A Marcelina

Tsutomu Tanaka

Electronic clinical thermometer

An electronic thermometer for measuring body temperature has a temperature sensor for detecting a sensed temperature and for producing an output indicative of the sensed temperature and a temperature rise detector for detecting whether the sensed temperature is rising. If the sensed temperature is rising, the temperature rise detector produces a temperature rise signal. The thermometer is provided with circuitry for generating an audible signal in response to the temperature rise signal. The device thus audibly indicates that the sensed temperature is rising and that the temperature measurement is proceeding normally. The temperature sensor includes a thermosensitive oscillator, the oscillating frequency of which changes depending on a change in its temperature, and a reference oscillator for generating a reference signal. A temperature counter counts an output signal from the thermosensitive oscillator on the basis of the reference signal. A data hold unit holds a maximum value of data on the measured signals in the temperature counter. A comparator compares data in the data hold unit and the new data in the temperature counter to thereby rewrite the data in the data hold unit with the new measured data in accordance with the result of the comparison by the comparator. The temperature rise detector detects whether the measured temperature is rising in accordance with the result of the comparison by the comparator. A temperature rise detection signal from the temperature rise detection device drives a sound generator to inform that the measured temperature is rising.

Electronic thermometer with audible temperature rise indicator

In an electronic clinical thermometer comprising a temperature oscillating circuit having a temperature sensor for detecting the body temperature; a body temperature measuring circuit for making data on the body temperature in response to an output signal of the temperature oscillating circuit; a digital display device having seven-segment digital patterns for displaying the body temperature in response to a signal of the body temperature measuring circuit; and a battery voltage detecting circuit for detecting a voltage drop of a battery, a first additional pattern and a second additional pattern are provided between two adjacent digital patterns of the digital display device and also an additional pattern decoder for driving the first and second additional patterns is provided, and the additional pattern decoder and decoders provided for driving the two digital patterns are controlled by an output signal of the battery voltage detecting circuit, whereby a battery life warning mark having the shape of the battery is displayed on the digital display device.

Electronic clinical thermometer with a battery life warning display

A temperature detector made by a CMOS integrated circuit. The temperature detector comprises a first constant voltage circuit for producing a first constant voltage, a second constant voltage circuit applied with the first constant voltage for producing a second constant voltage, and a ring oscillator applied with the second constant voltage for producing an output voltage dependent of ambient temperature. Each constant voltage circuit has a standard resistor in the form of a diffusion resistor, a current-mirror circuit as a standard voltage generating circuit, and a voltage follower, and the ring oscillator has a delay resistor formed by a MOS transistor.

Temperature detector

An electrochromic display device comprising a plurality of segment electrodes which are selectively driven by a driving circuit via a plurality of lead members so as to display patterns of uniform density. Each of the segment electrodes is designed such that their areas are substantially uniform. In addition, for those segment electrodes which differ in size, the output impedence of the driving circuit is adjusted. Moreover, the electrical resistance of each lead member is substantially equalized and the drive is controlled in proportion to the number of segment electrodes driven simultaneously.

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Saitama, Japan

Toyoharu Fujikawa