Sanden Corporation

Matsushita Electric Industrial Co., Ltd.

Matsushita Electronics Corporation

Panasonic Corporation

Sanden Holdings Corporation

Honda Giken Kogyo Kabushiki Kaisha

Other

Honda Motor Co., Ltd.

Nissha Co., Ltd.

Atsuo Inoue

Yasuhiro Shimada

Yasuhiro Uemoto

Koji Arita

Eiji Fujii

Akihiro Matsuda

Yoshihisa Nagano

Toru Nasu

Taketoshi Matsuura

Kenichi Suzuki

Masamichi Azuma

Tatsuo Otsuki

Hidenori Takei

Nobuyuki Yuri

Mitsuru Ishikawa

Akihiro Tajiri

Toshimi Isobe

Choji Sakuma

Susumu Ikeda

Noriaki Matsuno

Hideki Watanabe

Hiromitsu Adachi

Yasufumi Izutsu

Masato Tsuboi

Hiroshi Ikura

Masamichi Kubota

Tooru Nasu

Tatsuo Ootsuki

Toshihiko Fujita

Shinitirou Hayashi

Koichi Arita

Masaki Kibe

Tomonori Imai

Shota Nakashima

Tatsumi Sumi

Motoharu Sato

Shinichirou Wakou

Hirofumi Wada

Keisaku Nakao

Joji Nakane

Masahiro Takagi

Hiroaki Asada

Seizo Inagaki

Eigi Fujii

Koji Teraoka

A pressure detection device includes a pressure sensitive sensor and a pressure calculating unit. The pressure sensitive sensor includes an upper base substrate, a lower base substrate, and a pressure sensitive layer formed on a surface of one of the base substrates. The pressure sensitive layer includes a pair of pressure sensitive portions located symmetrically with respect to a plane center. A first elastic body and a second elastic body are disposed at a position to which a pressing force is applied. A first electrode and a second electrode are disposed with the pressure sensitive layer. The pressure calculating unit is configured to cause the pressure sensitive sensor to detect a pressure change for each of the pair of pressure sensitive portions and to add a sign-reversed pressure change in a pressure sensitive portion to a pressure change in the other pressure sensitive portion to amplify an output.

Pressure detecting and information input device to amplify an output

A vehicle air conditioning apparatus is provided that can prevent temperature variations of the air after the heat exchange in a radiator to reliably control the temperature of the air supplied to the vehicle interior. During the heating operation and the heating and dehumidifying operation, target degree of supercooling SCt when target air-blowing temperature TAO is a predetermined temperature or higher is set to SCtthat is greater than SCtwhen the target air-blowing temperature TAO is lower than the predetermined temperature. When amount of air Ga supplied from indoor fanis lower than a predetermined value, the target degree of supercooling SCt is corrected, which is set such that the degree of supercooling is lower than target degree of supercooling corrected when the amount of air Ga supplied from the indoor fanis a predetermined value or higher.

Vehicle air conditioning apparatus

A vehicle air conditioning apparatus is provided that can prevent temperature variations of the air after the heat exchange in a radiator to reliably control the temperature of the air supplied to the vehicle interior. During the heating operation and the heating and dehumidifying operation, target degree of supercooling SCt when target air-blowing temperature TAO is a predetermined temperature or higher is set to SCt1 that is greater than SCt2 when the target air-blowing temperature TAO is lower than the predetermined temperature. When amount of air Ga supplied from indoor fanis lower than a predetermined value, the target degree of supercooling SCt is corrected, which is set such that the degree of supercooling is lower than target degree of supercooling corrected when the amount of air Ga supplied from the indoor fanis a predetermined value or higher.

A voltage polarity determination circuit includes an integration circuit, a switch, and a time measurement circuit. The integration circuit includes an operational amplifier circuit having an input offset voltage which is larger than the maximum value of a voltage input to the integration circuit or smaller than the minimum value of the input voltage of the integration circuit. The switch switches the input voltage of the integration circuit between a voltage whose polarity is to be determined and a reference voltage. The time measurement circuit measures a time interval which it takes for the output voltage of the integration circuit to reach a set voltage, and based on the result of the measurement, determines the polarity of the input voltage of the integration circuit.

Voltage polarity determination circuit and charge amount measurement circuit

When performing radio communication with a reader/writer (), supply of a power source Sfrom a battery () is started when a level judgment circuit () judges that the signal level of a reception signal Sreceived by an antenna () of a noncontact data carrier () is equal to or higher than a predetermined amplitude and a timer circuit () judges that the state where the amplitude is equal to or higher than the predetermined value has continued for a predetermined period Tor more, and further, the supply of the power source Sfrom the battery is stopped when the level judgment circuit () judges that the signal level of the reception signal Sis lower than the predetermined amplitude and the timer circuit () judges that state where the amplitude is lower than the predetermined value has continued for a predetermined period Tor more, thereby ensuring communication reliability that causes no problem in practical use of the noncontact data carrier (), and avoiding insignificant dissipation of the battery.

Noncontact data carrier

Provided is a reference current circuit able to reduce temperature dependence of the reference current even in a case of using a resistor with extremely low temperature-dependent resistance. The reference current circuit comprises a non-inverting amplifier circuitreceiving a temperature-compensated reference voltage Vand generating a voltage Vat an output point; a current source circuitcomposed of a transistor Qconnected to the output point via a resistor and a transistor Qreceiving a voltage equal to a voltage Vgenerated across terminals of Qand generating a corresponding current. The circuit(i) includes a third transistor Q, a voltage Vgenerated across terminals of which has the same temperature characteristic as the voltage V, and (ii) is configured such that Vis a sum of (a) a temperature-compensated voltage component based on Vand (b) a voltage component equal-to-the voltage V.

Reference current circuit

The ferroelectric memory apparatus stores data, and includes: a ferroelectric memory element; a temperature sensor which detects a temperature of the apparatus; a control unit that outputs a control signal indicating a voltage, the voltage increasing as the temperature detected by the temperature sensor decreases; and a voltage generating unit that generates the voltage indicated by the control signal outputted by the control unit, and to supply the generated voltage to the ferroelectric memory element. This provides a ferroelectric memory apparatus which can recover from effects of thermal stress suffered after shipment&#x2014;i.e., reduction in the polarization amount needed for data retention as well as imprint degradation&#x2014;using a relatively simple configuration.

Ferroelectric memory apparatus and control method of the same

An inverse temperature characteristic generating circuit decreases an output voltage Vby a voltage V, and supplies the resultant voltage as a voltage VA to a temperature characteristic generating circuit. The temperature characteristic generating circuit includes a differential amplification circuit that receives a terminal voltage Vbetween resistances Rand Rand an emitter voltage Vof a bipolar transistor T, and outputs a control signal VC. When the terminal voltages Vand Vare equal to each other, an operation of a circuit is stable. The temperature characteristic of the voltage VA during the stable operation, and the temperature characteristic of the voltage Vare inverse to each other and therefore cancel each other, so that the constant voltage Vindependent of temperature is output. In addition, the output terminal is not connected via a resistance to a ground, so that low current consumption can be easily achieved.

Constant voltage circuit

When a controller transmits a clock pulse of a positive phase as a first transmit signal (a) and a clock pulse of an opposite phase as a second transmit signal (b), the controller modulates the 'H' pulse of the second transmit signal to a signal advanced by time of tdrelative to the 'L' pulse of the first transmit signal when the logic of transmit data is &#x201c;1&#x201d;, and to a signal advanced by time of tdrelative thereto when the logic of transit data is &#x201c;0&#x201d; and transmits the modulated signal. A data carrier device detects the change of the delay time of the second transmit signal by using a clock extracted from the first transmit signal to demodulate data (e).

Two-wire type data communication method and system, controller and data recording apparatus

A data carrier system includes: a first memory, which is a ferroelectric memory; a second memory; a polarization canceling circuit for canceling polarization of the first memory in accordance with an instruction given thereto; and a control circuit for making data access to the first and second memories and controlling operation of the polarization canceling circuit. Upon receipt of a first instruction, the control circuit saves data stored in the first memory to the second memory and then gives an instruction for canceling polarization to the polarization canceling circuit, while upon receipt of a second instruction, the control circuit writes the data saved to the second memory back into the first memory.

Data carrier system and data saving/restoring method thereof

According to the present invention, after a bias circuit () starts, a startup circuit () is isolated from the bias circuit () according to a bias voltage generated on an isolating voltage node (V) from the bias circuit () to the startup circuit (), and steady current consumption can be prevented in the startup circuit ().

Current source circuit

Growing community of inventors

Kyoto, Japan

Atsuo Inoue