Kabushiki Kaisha Daini Seikosha

Seiko Instruments & Electronics Ltd.

Fuji Photo Film Company, Limited

Junichi Tabata

Noboru Kaneko

Shinji Hamada

Minoru Sawada

Hiroshi Oikawa

Masahiro Torii

Fumio Hoshino

Yasuyuki Masui

A pulsimeter having a detection electrode receptive of electrocardiac signals of a person and a pulse detection circuit, a switching element connected between an input terminal of the pulse detection circuit and a ground level, and a switch for controlling the conduction state and non-conduction state of the switching element so that the detection circuit can be protected from the static electricity by conducting the switching element in the pulse detection mode.

Pulsimeter

A pulse detector comprising an electrocardiac potential detector for detecting an electrocardiac signal induced to the skin of the person and a pulse counter for counting the pulse rate. The pulse detector comprises a pulse detection supervisory system for automatically controlling a pulse detection sensitivity and noise sensitivity at the optimum value.

Pulse detector

A heartbeat rate indicator has a detection electrode on the surface of the housing such as a wristwatch case and the element of a circuit-input portion in which the existence of a switch connected to the detection electrode prevents the element from destroying with electrostatic charge produced at the moment of touching the detection electrode with the human body, the clothes or the like. Because in the non-depression state of the detection electrode, the detection electrode is connected elastically through the switch to one terminal of a power source so that the electrostatic charge produced at the moment of touching the detection electrode with the human body discharges to the one terminal of the power source.

Heartbeat rate indicator

An electrochromic display device has an electrolyte contained between two spaced-apart substrates. A plurality of display segments are disposed on the surface of at least one of the substrates in contact with the electrolyte, and a counter electrode is disposed on the surface of the other substrate in contact with the electrolyte. Each of the display segments comprises a transparent electrode and an electrochromic layer disposed on the transparent electrode such that the display segment exhibits either colored or bleached states depending on the amount of electric charge held by the display segment. A charge transfer voltage is periodically applied between preselected bleached and colored display segments to effect transfer of electric charges through the electrolyte to thereby periodically change the display state. The difference between the coloration electric charge quantity at the present display state and the coloration electric charge quantity at the next display state is compensated for by either injecting or extracting electric charge into or from the display segments so as to maintain the color density constant.

Electrochromic display device having constant color density and driving

An electronic timepiece provided with an electrochromic display device as a time related information display. The ECD is driven by an electric charge transfer method. The electric charges which cause coloration of segments directly transfer from non-selected segments to selected segments. In the ECD additional concealed dummy segments temporally store the excess electric charges when the total area of the selected segments decreases, and release the stored electric charges when the total area of the selected segments increases, so that the electric charge density of colorized segment is always kept constant. Moreover electric charges are periodically supplied to the display device so as to compensate the lost amount which was dissipated during transfer cycle.

Electronic timepiece with electrochromic display

A charge control circuit has an excess charge detecting circuit for preventing the excess charge of a secondary battery responsive to the voltage of the secondary battery, and a switching circuit responsive to the output of the excess charge detecting circuit. The switching circuit and the excess charge detecting circuit are operated by the electromotive force of a solar cell without the power dissipation of the secondary battery.

Charge control circuit

An electrochromic display device has an electrolyte contained between two spaced-apart substrates. A set of display elements including first and second display elements are disposed on the surface of at least one of the substrates in contact with the electrolyte, and a counter electrode is disposed on the surface of the other substrate in contact with the electrolyte. Each of the display elements comprises a transparent electrode and an electrochromic layer disposed on the transparent electrode such that the display element exhibits either colored or bleached states depending on the amount of electric charge held by the display element. A charge transfer voltage is selectively applied between preselected bleached and colored display elements to effect transfer of electric charges through the electrolyte to thereby change the display state. Deterioration of the coloration exhibited by the colored display elements is compensated by applying a constant voltage between the first display element and the counter electrode, the value of the constant voltage being lower than that of the charge transfer voltage, and control circuitry controls the application of the constant voltage such that the constant voltage is applied before each predetermined number of transfers of electric charge held by the first display element to the second display element thereby maintaining the degree of coloration of the colored display elements.

Electrochromic display device

A driving circuit for an electrochromic display device in which electric charges for coloration in a colored segment group are transferred to a bleached segment group to change the display state by the application of a voltage between the colored segment group and the bleached segment group comprises an electric charge transfer control circuit for producing an electric charge transfer signal only when the display information displayed by the electrochromic display device is being changed, and an electric charge transfer-time control circuit for setting the electric charge transfer-time at a time more than the maximum transfer time required by the electrochromic display device both during low temperature operation and during electric charge transfer using the maximum number of segments for which electric charge transfer can be carried out by the electrochromic display device.

Electrochromic display device exhibiting uniform coloration density

An electrochromic display device comprising a display electrode group, a refresh electrode and a counter electrode, is driven by an electric charge transmisson method. Initially the coloration electric charge is injected into some of the display electrodes from the counter electrode. Thereafter the stored coloration electrode charge is cyclically transmitted among the display electrode group to display a variant pattern. The repeat of the transmission causes deterioration of an amount of the coloration electric charge. In order to compensate a lack of the amount of the coloration electric charge, periodically a coloration electric charge is injected into the refresh electrode from the counter electrode. Then the newly added coloration electric charge is transmitted into the display electrode group to maintain display contrast.

An electrochromic display device comprises; an electrolyte held between two substrates at least one of which is transparent. A display electrode is formed on a surface of one substrate and has an electrochromic substance film formed thereon, the surface being in contact with the electrolyte. A first counter electrode is formed on a counter surface of the other substrate in opposed spaced-apart relationship with respect to the display electrode, and a second counter electrode is formed on a face of either one of the substrates, the face being in contact with the electrolyte. Circuitry applies a first voltage between the display electrode and the first counter electrode to effect coloration of the display electrode, and applies a second voltage between the first and second counter electrodes to establish an electric field therebetween effective to remove a negative ion region which forms in the vicinity of the first counter electrode during coloration of the display electrode.

A charging control circuit for an electronic timepiece has a power source circuit including a charging device and a secondary battery, an electronic timepiece circuit, a drive signal change-over circuit for changing an alarm signal and warning signal for excessive charge, and a buzzer driving circuit for driving a buzzer. The buzzer sound for indicating excessive charge to the secondary battery is different from that of time alarm.

Charging control circuit for electronic timepiece

A detecting circuit for a power source voltage comprises a reference voltage generating circuit for generating a reference voltage, a voltage dividing circuit for dividing the power source voltage, and a voltage comparing circuit having one input terminal connected to receive the reference voltage from the reference voltage generating circuit and another input terminal connected to receive the divided voltage from the voltage dividing circuit. In one embodiment, the reference voltage generating circuit comprises at least two MOS-transistors having different threshold voltages and having the same polarity, one of the MOS-transistors having its gate and drain connected together with the drain being connected to the gate of the other MOS-transistor, the drain and source of the other MOS-transistor each being connected to a resistor, and the drain of the other MOS-transistor being connected to one input terminal of the voltage comparing circuit. In another embodiment, the reference voltage generating circuit comprises a P-channel MOS-transistor having its drain connected to the drain of the N-channel MOS-transistor and the gates of the P-channel and N-channel MOS-transistors being connected to the drains thereof respectively, one of the MOS-transistors being connected to one terminal of the power source, and the other of the MOS-transistors being connected to one input terminal of the voltage comparing circuit.

Detecting circuit for a power source voltage

A driving system for an electro chromic display, comprising a display information signal generator, a generator of a coloring pulse and an erasing pulse, a memory time counter, a refresh pulse arrange circuit and a driver. The display means is refreshed when a memory time determined by the memory time counter has elapsed, to maintain color regularity.

Driving system for display

In contact-printing the image of a transmission type original on a photosensitive plate material positioned on a printing stage, the original is in advance fixed to a transparent sheet which is movable between an open position and a closed position. The original is fixed to the transparent sheet at a predetermined position thereon at which the original will be registered with the plate material when the transparent sheet is moved to its closed position. In the open position, the transparent sheet is held away from the printing stage to permit change of the plate material and in the closed position, the transparent sheet sealingly covers the plate material in a predetermined positional relationship therewith and the space under the transparent sheet is evacuated to bring the transparent sheet, the original and the plate material into close contact with each other. Then, the three members are exposed to light.

Method and device for contact-printing

A case-back of an electronic timepiece is provided with a means to detect whether said timepiece is on a human arm or not. When the timepiece is put on the arm, said detecting means operates a switching means to enable a display. When the timepiece is taken off the arm the display is not operated, so the consumption is reduced and the battery is saved.

Growing community of inventors

Tokyo, Japan

Junichi Tabata