Patents by Inventor Tetsuya Nagashima

Tetsuya Nagashima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12149329
    Abstract: 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.
    Type: Grant
    Filed: February 24, 2023
    Date of Patent: November 19, 2024
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventor: Tetsuya Nagashima
  • Publication number: 20240146397
    Abstract: 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.
    Type: Application
    Filed: February 24, 2023
    Publication date: May 2, 2024
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventor: Tetsuya Nagashima
  • Patent number: 11694532
    Abstract: A photoelectric smoke detector (14) connected to a signal line (12-1) drawn into a warning area from a receiver (10) transmits a fire signal including identification information of smoke caused in detection zones Z1 and Z2. In the detection zones, a sensor (18) for sensing a change of physical phenomenon other than smoke involved in fire is provided, and the sensor (18) is connected to the signal line (12-1) via a relay device (16). The sensor (18) is at least one of a CO2 sensor, a CO sensor, a fire sensor, and a heat sensor. A fire alarm control unit (48) of the receiver (10) causes an alarm to be given, when determining the identification information of the smoke by the photoelectric smoke detector (14) and a sensing value by at least one of the CO2 sensor, the CO sensor, the fire sensor, and the heat sensor.
    Type: Grant
    Filed: July 22, 2021
    Date of Patent: July 4, 2023
    Assignee: HOCHIKI CORPORATION
    Inventor: Tetsuya Nagashima
  • Publication number: 20210350684
    Abstract: A photoelectric smoke detector (14) connected to a signal line (12-1) drawn into a warning area from a receiver (10) transmits a fire signal including identification information of smoke caused in detection zones Z1 and Z2. In the detection zones, a sensor (18) for sensing a change of physical phenomenon other than smoke involved in fire is provided, and the sensor (18) is connected to the signal line (12-1) via a relay device (16). The sensor (18) is at least one of a CO2 sensor, a CO sensor, a fire sensor, and a heat sensor. A fire alarm control unit (48) of the receiver (10) causes an alarm to be given, when determining the identification information of the smoke by the photoelectric smoke detector (14) and a sensing value by at least one of the CO2 sensor, the CO sensor, the fire sensor, and the heat sensor.
    Type: Application
    Filed: July 22, 2021
    Publication date: November 11, 2021
    Inventor: Tetsuya NAGASHIMA
  • Patent number: 8773272
    Abstract: 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.
    Type: Grant
    Filed: January 7, 2010
    Date of Patent: July 8, 2014
    Assignee: Hochiki Corporation
    Inventor: Tetsuya Nagashima
  • Patent number: 7896544
    Abstract: To provide a heat detector in which thermal responsiveness of a heat detecting unit such as a ceramic element is improved. A heat detector 1 includes a ceramic element 10 accommodated in a sensing-device main body, and measures a temperature in a monitoring area based on a dielectric constant of the ceramic element 10. The Curie point temperature of the ceramic element 10 is set in a predetermined sensitive temperature range.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: March 1, 2011
    Assignee: Hochiki Corporation
    Inventors: Tetsuya Nagashima, Manabu Dohi, Yoshimi Kawabata, Yasuo Ohmori
  • Patent number: 7802918
    Abstract: 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 unit 11 that senses heat in a monitoring area, and a casing 81 that holds the heat detecting unit 11, and the heat detecting unit is held by the casing 11 via a laminating portion 60 which serves to protect the heat detecting unit 11.
    Type: Grant
    Filed: February 3, 2006
    Date of Patent: September 28, 2010
    Assignee: Hochiki Corporation
    Inventors: Manabu Dohi, Tetsuya Nagashima, Yoshimi Kawabata, Yasuo Ohmori
  • Patent number: 7746239
    Abstract: 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.
    Type: Grant
    Filed: November 17, 2004
    Date of Patent: June 29, 2010
    Assignee: Hochiki Corporation
    Inventor: Tetsuya Nagashima
  • Publication number: 20100118303
    Abstract: 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.
    Type: Application
    Filed: January 7, 2010
    Publication date: May 13, 2010
    Inventor: Tetsuya Nagashima
  • Publication number: 20090028215
    Abstract: 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 unit 11 that senses heat in a monitoring area, and a casing 81 that holds the heat detecting unit 11, and the heat detecting unit is held by the casing 11 via a laminating portion 60 which serves to protect the heat detecting unit 11.
    Type: Application
    Filed: February 3, 2006
    Publication date: January 29, 2009
    Inventors: Manabu Dohi, Tetsuya Nagashima, Yoshimi Kawabata, Yasuo Ohmori
  • Publication number: 20090010303
    Abstract: [Object] To provide a heat detector in which thermal responsiveness of a heat detecting unit such as a ceramic element is improved. [Means] A heat detector 1 includes a ceramic element 10 accommodated in a sensing-device main body, and measures a temperature in a monitoring area based on a dielectric constant of the ceramic element 10. The Curie point temperature of the ceramic element 10 is set in a predetermined sensitive temperature range.
    Type: Application
    Filed: February 3, 2006
    Publication date: January 8, 2009
    Inventors: Tetsuya Nagashima, Manabu Dohi, Yoshimi Kawabata, Yasuo Ohmori
  • Publication number: 20080246623
    Abstract: 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.
    Type: Application
    Filed: November 17, 2004
    Publication date: October 9, 2008
    Inventor: Tetsuya Nagashima
  • Patent number: 5859706
    Abstract: 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.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: January 12, 1999
    Assignee: Hochiki Kabushiki Kaisha
    Inventors: Tetsuya Nagashima, Naoki Kosugi, Yoshiki Ohmori
  • Patent number: 5670947
    Abstract: 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.
    Type: Grant
    Filed: December 11, 1995
    Date of Patent: September 23, 1997
    Assignee: Hochiki Corporation
    Inventor: Tetsuya Nagashima
  • Patent number: 5642099
    Abstract: 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.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: June 24, 1997
    Assignee: Hochiki Kabushiki Kaisha
    Inventor: Tetsuya Nagashima
  • Patent number: 5587790
    Abstract: 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.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: December 24, 1996
    Assignee: Hochiki Corporation
    Inventor: Tetsuya Nagashima
  • Patent number: 5576697
    Abstract: 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.
    Type: Grant
    Filed: April 19, 1994
    Date of Patent: November 19, 1996
    Assignee: Hochiki Kabushiki Kaisha
    Inventors: Tetsuya Nagashima, Masato Aizawa
  • Patent number: 5502434
    Abstract: 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.
    Type: Grant
    Filed: May 21, 1993
    Date of Patent: March 26, 1996
    Assignee: Hockiki Kabushiki Kaisha
    Inventors: Osami Minowa, Junichi Narumiya, Tetsuya Nagashima, Yoshihito Hirai, Mariko Ishida
  • Patent number: 5497009
    Abstract: 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.
    Type: Grant
    Filed: October 27, 1994
    Date of Patent: March 5, 1996
    Assignee: Hochiki Corporation
    Inventors: Yasuo Torikoshi, Naoki Kosugi, Tetsuya Nagashima
  • Patent number: 5430307
    Abstract: 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.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: July 4, 1995
    Assignee: Hochiki Corporation
    Inventor: Tetsuya Nagashima