Tamura Electric Works, Ltd.

Japan Display Inc.

Kokusai Denshin Denwa Co., Ltd.

Tamura Electrics Works, Ltd.

Osamu Kai

Yoshiaki Takeda

Takashi Oyamada

Nobuo Suzuki

Yukiya Hirabayashi

Hiroyuki Asano

Takehiko Ishii

Yasuyuki Inomata

Koichi Nagao

Hiroshi Tachibana

Shigekazu Sakata

Kohei Yamaguchi

Hiroya Morimoto

Shunpei Takeuchi

Toshiaki Hayasaka

Toshiharu Kinoshita

Kazuhide Kobayashi

Toshiharu Morihisa

Masaaki Tsukada

Tatsumi Takagi

Junichi Muroi

Hideyuki Oikawa

Toshimichi Kubota

Katsuichi Ide

A light adjustment device includes a panel unit having a rectangular pillar shape and including a plurality of light adjustment panels stacked in a first direction, each light adjustment panel having a polygonal shape and including a lower substrate and an upper substrate overlapping the lower substrate. The light adjustment panels each have a first side, a second side adjacent to the first side, and a first corner at which the first side intersects the second side, and when two light adjustment panels adjacent to each other in a first direction among the light adjustment panels are viewed in the first direction, the first corner of one of the light adjustment panels is positioned inside of an edge of the other light adjustment panel, and the first corner of the other light adjustment panel is positioned inside of an edge of the one light adjustment panel.

Light adjustment device and light adjustment device manufacturing method

A public telephone system includes public telephone sets assigned with different specific numbers and allowing speech communication using cards and a center apparatus connected to the public telephone sets through a telephone line. The center apparatus includes a list number forming unit for forming one list number from numbers of a plurality of invalid cards produced by illegally rewriting the cards, a registering unit for registering each formed list number in association with a series number, management number, and telephone number of each of the telephone sets, a storage unit for storing the list number and the series number, management number, and telephone number of each telephone set, all of which are registered by the registering unit, and a list number transmitting unit for calling, through the telephone line, each public telephone set corresponding to the telephone number registered in the storage unit and transmitting a list number corresponding to each telephone set. Each public telephone set includes a controller for controlling on the basis of the list number whether speech communication is allowed in use of a card.

Public telephone system

A power source control circuit for a telephone set, includes a power source switch, a detecting circuit, a power hold circuit, and a control circuit. The power source switch supplies an external power to the telephone set. The detecting circuit detects an off-hook operation of the telephone set or an incoming signal arriving at a line. The power hold circuit holds the power source switch in an ON state for a predetermined time period on the basis of an output from the detecting circuit. The control circuit is activated by supply of the external power and transmits an extension signal for extending the ON state of the power source switch within the predetermine time period.

Power source control apparatus for telephone set

A coin diameter discriminating device includes a plurality of optical sensors, a measuring section, and a calculating section, and a discriminating section. The plurality of optical sensors are arranged along the coin path so as to be separated from each other in a direction to cross a coin rolling direction and to oppose different positions of a coin which rolls downs. The measuring section measures a detection time of the coin on the basis of outputs from the optical sensors. The calculating section calculates a ratio of the detection times of two specific optical sensors which are supplied from the measuring section. The discriminating section discriminates a diameter of the inserted coin on the basis of a calculation result from the calculating section.

Coin diameter discriminating device

A coin discrimination apparatus discriminates authenticity and a denomination of a coin by oscillation magnetic fields of high and low frequencies in a low frequency band in which generated magnetic fluxes allow a coin to pass therethrough. A first oscillation coil for generating an oscillation magnetic field of a low frequency and a reception coil are arranged at coin contact and coin non-contact surfaces, respectively, of an inclined coin path to face each other. A second oscillation coil is arranged on the coin non-contact surface to be separated from the reception coil by a predetermined distance in a coin rolling direction and generates an oscillation magnetic field of a high frequency. The coin discrimination apparatus includes a first sensor circuit for detecting maximum values of changes in impedances of the oscillation coils and the reception coil upon passage of a coin, a second sensor circuit for detecting the changes in impedances when the changes in impedances of the first and second oscillation coils coincide with each other, and a CPU for discriminating authenticity and the denomination of the coin based on coin physical characteristics in accordance with the detection results from the sensor circuits.

Coin discrimination apparatus

A method of correcting coin data and an apparatus for inspecting coins in which determination data is formed on the basis of data read out from a permanent memory, and authenticity and determination of coins are determined on the basis of the readout data. At the same time, maximum and minimum values corresponding to physical characteristics of coins are obtained. When the number of stored coins reaches a predetermined number or an operating time reaches a predetermined duration, the maximum and minimum values are updated. When such updating is performed a predetermined number of times, a standard deviation is also updated.

Method of correcting coin data and apparatus for inspecting coins

A public telephone set includes a speech circuit including transmitting and receiving amplifiers for forming a channel loop and two pairs of conductors for respectively connecting a transmitter and a receiver in a handset to the transmitting and receiving amplifiers in the speech circuit. The telephone set further includes an energization circuit having a resistor applied with a power source voltage, a latching relay for switching at least one of the transmitter and the receiver through the conductors to the speech circuit or the energization circuit, and a CPU including an internal timer for monitoring a connecting state of the handset by presence/absence of a current supplied to the energization circuit or a voltage appearing in the energization circuit when the latching relay switches at least one of the transmitter and the receiver to the energization circuit.

Public telephone set

A coin discrimination apparatus has: detecting circuitry for detecting as an electrical signal a physical characteristic of a coin; an analog-to-digital converter for converting an output of the detecting circuitry to a digital signal; and a memory device for receiving as an address signal the digital signal generated from the analog-to-digital converter and for storing a binary signal of a plurality of bits for discriminating the physical characteristic in bit positions corresponding to a denomination of the coin at each address for each of the physical characteristics. The memory device is accessed by the digital signal from the analog-to-digital converter as a read signal and allows readout of the accessed content as a signal representing authenticity of the coin.

In a coin telephone, a self diagnosis function and an alarm information transmission function upon formation of a loop in an off-hook mode are utilized. Upon reception of a ringing signal from a maintenance control center, self diagnosis is performed. Upon detection of a failure, a content of the failure and a control number of the coin telephone are sent to the maintenance control center. A failure check for a coin telephone which is not frequently used can be performed from the telephone center without requiring an off-hook operation.

Alarm information transmission system for coin telephone

A method for controlling task processes using a minimum of energy. The task processes are divided into two or more groups in accordance with an execution priority. The individual task processes within each group are further prioritized with respect to each other. The method is driven by repetitive processing cycles. During each processing cycle, the highest priority task of the highest priority group is selected and executed. The method assumes a sleep or low power drain state in response to the completion of the execution of a selected task process or when no task process is available for processing and is returned to an operational state in response to the next processing cycle. The task process of the lower priority groups are selected at a longer execution cycle rate which are an integer multiple of the processing cycles.

Growing community of inventors

Tokyo, Japan

Osamu Kai