Hochiki Corporation

Hochiki Kabushiki Kaisha

Other

Mitsubishi Heavy Industries Limited

Tetsuya Nagashima

Manabu Dohi

Naoki Kosugi

Yasuo Ohmori

Masato Aizawa

Yoshimi Kawabata

Yoshihito Hirai

Sadataka Yuchi

Akira Kitajima

Junichi Narumiya

Yoshinori Kaminaka

Mariko Ishida

Hiroshi Yashima

Yasuo Torikoshi

Eige Matsushita

Tetsuji Sato

Eiji Matsushita

Osami Minowa

Satoru Koizumi

Yoshiki Ohmori

Provided are a data encoding device, a data transmission system, a data encoding method, and a data encoding program that can compress a data volume and transmit the compressed data without reducing the amount of information in text data. The data encoding device includes: an input unit to which text data created based on weather prediction information on a two-dimensional map is input; an encoding unit configured to encode the text data in accordance with a predetermined conversion list to create encoded text data; and a communication unit configured to transmit the encoded text data via text data communication.

Data encoding device, data transmission system, data encoding method, and data encoding program

A photoelectric smoke detector () connected to a signal line (-) drawn into a warning area from a receiver () transmits a fire signal including identification information of smoke caused in detection zones Zand Z. In the detection zones, a sensor () for sensing a change of physical phenomenon other than smoke involved in fire is provided, and the sensor () is connected to the signal line (-) via a relay device (). The sensor () is at least one of a COsensor, a CO sensor, a fire sensor, and a heat sensor. A fire alarm control unit () of the receiver () causes an alarm to be given, when determining the identification information of the smoke by the photoelectric smoke detector () and a sensing value by at least one of the COsensor, the CO sensor, the fire sensor, and the heat sensor.

Fire alarm equipment

A light scattering type smoke sensor includes a sensor body, light-emitter for emitting light toward an open smoke-sensing space and outputting a light-received signal according to the amount of scattering light received, and a fire judging unit for judging whether fire occurs or not on the basis of the amount of received light determined on the basis of the outputted light-received signal.

Light scattering type smoke detector

To provide a heat detector in which thermal responsiveness of a heat detecting unit such as a ceramic element is improved. A heat detectorincludes a ceramic elementaccommodated in a sensing-device main body, and measures a temperature in a monitoring area based on a dielectric constant of the ceramic element. The Curie point temperature of the ceramic elementis set in a predetermined sensitive temperature range.

Heat detector and method of manufacturing heat detecting element

An object is to build a protective structure which can protect a ferroelectric material from a surrounding environment when the ferroelectric material is used as a heat detecting element of a heat detector, thereby enhancing the reliability of the heat detector. A heat detector includes a heat detecting unitthat senses heat in a monitoring area, and a casingthat holds the heat detecting unit, and the heat detecting unit is held by the casingvia a laminating portionwhich serves to protect the heat detecting unit

Heat detector

A drive pulse for emitting and turning-off a light emitting element is output, the level difference or the level ratio between the light emission zero point detection signal from a light receiving element having received the light from the light emitting element and a putting-off zero point detection signal from the light receiving element when the light emitting element is put off is calculated, and the level difference or the level ratio is compared with a preset level to thereby determine the abnormality of the light emitting element, the light receiving element and a peripheral circuit. With this arrangement, even if the ratio of noise light occupied in the zero point output is reduced, whether detecting elements and the peripheral circuit are good or bad and whether the elements are abnormally polluted or not can be reliably tested without the effect of the dispersion of the detecting elements and the change of an ambient temperature, whereby the reliability of a smoke detector is improved.

Photoelectric smoke detector and disaster monitoring system using the

In a light scattering smoke sensor of the present invention, a first diaphragm portion is disposed just aheat of a light receiving device, and a second diaphragm portion is disposed ahead of the first diaphragm portion. A gap between the first and second diaphragm portion is a smoke introducing portion which introduces smoke to a smoke detecting space via a gap between labyrinth members and the second diaphragm portion.

Light scattering smoke sensor

A light scattering type smoke detector arranged such that even if the range in which light from an LED is emitted has a dispersion, a labyrinth member 90 in the light emitting range has no edge or only a predetermined labyrinth member exist therein. The labyrinth member 90 is preferably formed by a single plate larger than the other labyrinth members 9. The edges of the labyrinth members 9 are preferably formed to a curved surface or chamfered, and the dispersion of the 0 point of a detection output is reduced and the level of the 0 point of the detection signal is lowered to thereby accurately detect light scattered by smoke.

A light scattering type smoke sensor of the present invention has a plurality of labyrinth members for facilitating an inflow of smoke entering from the outside, and for cutting off light entering from the outside; a plurality of smoke inlets each of which is formed by a space between paired ones of the labyrinth members being adjacent to each other; a smoke detecting chamber which is formed in a center portion by the labyrinth members; light emitting device for radiating light toward the smoke detecting chamber; and light receiving device for detecting light which is scattered by the smoke in the smoke detecting chamber, the light receiving device having an optical axis which intersects in the smoke detecting chamber an optical axis of the light emitting device at a scattering angle in the range of 60.degree. to 80.degree., wherein one of the labyrinth members intersects the optical axis of the light emitting device, which has a reflecting face for reflecting light radiated from the light emitting device, the reflecting face reflecting the light in a direction opposite to the light receiving device.

Light scattering type smoke detector having an improved zero-point level

A fire alarm system comprises a first light emitting device (11), a first polarizing filter (31), a first light receiving device (21), a second light emitting device (12), a second polarizing filter (32), and a second light receiving device (22). With the above arrangement, the amount of the parallel polarized component to the scattering plane as well as the amount of the perpendicular polarized component to the scattering plane is detected. The ratio between these amounts of light has a correlation with the type of smoke. A calculation section (4) calculates this ratio from the outputs of the light receiving devices (21, 22). A decision section (6) compares the above-described ratio with a reference value which has been preset according to the type of smoke to be detected, whereby the judgement of whether there is a fire or not is performed depending on the type of smoke. Thus, the detection of a fire can be performed from the light scattered by smoke taking into account the type of smoke.

Fire alarm system

A separate type photoelectric smoke sensor having a light emitting section for emitting a light beam to a reflecting plate disposed at a certain distance from the light emitting section, a light receiving section for receiving reflected light from the reflecting plate, and a judgement section for outputting a sense signal if a received light output from the light receiving section is smaller than a threshold value previously set. The quantity of reflected light from a shielding object is obtained from the difference between or the ratio of the quantity of received light measured during lighting of the light emitting section in a situation where there is no shielding object and the quantity of received light measured during lighting of the light emitting section in a situation where there is the shielding object, and the difference between these quantities of reflected light and the quantity of received light measured during lighting of the light emitting section is compared with the threshold value to determine whether or not there is a fire. It is thereby possible to correctly discriminate the existence of any shielding object other than smoke in an observed region. Even if there is a shielding object, the influence of the shielding object is cancelled to obtain the true quantity of reflected light from the reflecting plate no matter what the reflectivity thereof, thereby ensuring accurate determination as to whether or not there is a fire.

Smoke sensor

A photoelectric sensor of the present invention includes a light emitting device and a light receiving device for detecting scattered light due to smoke, a light emitting confirming device which lights up when a quantity of light received by the light receiving device is greater than or equal to a threshold and a test light emitting device for emitting light to the light receiving device during the test, wherein a blinking of the light emitting confirming device is started at a time of a test start, and a quantity of light received by the light receiving device is increased in steps so that the blinking is stopped when the quantity is greater than or equal to the threshold. Accordingly, the sensitivity test can be performed by visually counting the number of blinkings of the light emitting device.

Photoelectric smoke sensor and fire detecting system, and sensitivity

A smoke detector in which a plurality of labyrinth members are disposed on an upper wall in a standing position. In an area surrounded by the labyrinth members, a smoke detecting chamber is formed. A light emitting device and a light detecting device are disposed in such a manner that their optical axes intersect each other at the center of the smoke detecting chamber. In order for the visual field of the light detecting device with respect to the smoke detecting chamber to be restricted to the front area thereof, the labyrinth member which cross the optical axis of the light emitting device is formed so as to be longer than the other labyrinth members, and a gap is formed between the front end of the long labyrinth member and a light shielding plate for preventing the light emitted by the light emitting device from directly reaching the light detecting device. Therefore, the zero-point level of the detection output for light scattered by smoke is lowered to enhance the reliability and effectiveness of the smoke detector.

Light scattering smoke detector with smoke-entrance ladyrinth designed

A fire alarm system which radiates light towards a smoke detecting space. Scattered light resulting from smoke that may exist in the smoke detecting space is judged by a receiver with respect to the type of smoke that may prevail in the space. The presence of a fire is judged by comparing the light that has been received with a set threshold level. The threshold level is set to different levels in accordance with the type of smoke detected.

Growing community of inventors

Tokyo, Japan

Tetsuya Nagashima