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51. 发明专利

JPH0554274A HEAT SENSOR 失效
公开(公告)号：JPH0554274A
公开(公告)日：1993-03-05
申请号：JP23876491
申请日：1991-08-25
申请人： HOCHIKI CO
发明人： ASANO ISAO
IPC分类号： G08B17/00 , G08B17/06 , H05K5/02
摘要： PURPOSE:To improve both assembly easiness and anticorrosion and waterproof reliability at the same time by performing the final assembly of an integrated electronic component with a printed a heat sensor main body by plugging in a resin component. CONSTITUTION:An electronic circuit required to control the operation and detection output of a heat detecting element 1 is constituted on the printed board 6 and the integrated electronic function component is formed. Further, the plug type resin component 5 molded integrally with the heat detecting element 1 is equipped with lead wires 7 and engagement legs and connected to the printed board 6 to constitute the integrated component. An O ring 3 is mounted in the gap between the plug type resin component 5 and a projection hole 4a and constitutes airtight structure when the component is pluged in. A lid 4d is provided behind an electronic component storage chamber 4c, which is sealed hearmetically; and a lead guide part 4e for connecting the electronic component electrically to the outside is formed in the center of the lid 4d. An engagement part 4f is fixed opposite the upper end of the lid 4d across the printed board 6. The O ring 4 is provided between the lid 4d and a main body 4.

52. 发明专利

JP2002122473A INFRARED SENSOR 失效
公开(公告)号：JP2002122473A
公开(公告)日：2002-04-26
申请号：JP2000313197
申请日：2000-10-13
申请人： HOCHIKI CO
发明人： MIZOBUCHI MANABU , ASANO ISAO
IPC分类号： G01J1/02 , G01J1/42 , G08B17/12
摘要： PROBLEM TO BE SOLVED: To prevent a malfunction by a radioactive noise. SOLUTION: The radioactive noise is prevented from entering into and riding on pins of an infrared sensor 9 by providing a shield structure which encloses a periphery of a contact part of a metal case (can) 30 of the infrared sensor 9 and a grounded land 29 of a printed circuit board 10 with a conductive tape 32.

53. 发明专利

JP2002042264A OPTICAL FIRE DETECTOR AND DISASTER PREVENTION SUPERVISORY SYSTEM 失效
公开(公告)号：JP2002042264A
公开(公告)日：2002-02-08
申请号：JP2000228331
申请日：2000-07-28
申请人： HOCHIKI CO
发明人： IGARASHI KOEI , AIZAWA MASATO , ASANO ISAO , NAKAJIMA TAKAHIRO
IPC分类号： G08B17/12 , G08B29/18
摘要： PROBLEM TO BE SOLVED: To appropriately perform maintenance including cleaning by grasping the dirt extent of a translucent window of a fire detector. SOLUTION: A test processing part 42 of the fire detector 3 detects, at least, the dirt extent (extinction rate or transmittance) of the translucent window by a light reception detecting signal obtained by receiving a test light transmitted from test light sources 36a and 36b by sensor parts 28a and 28b via the translucent windows 18a and 18b and transmits an analog value signal expressing the dirt extent of the translucent window. A disaster prevention receiving board 1 receives the analog value signal expressing the dirt extent of the translucent window transmitted from the fire detector 3 to store it in a storage part, informs a dirt alarm when it exceeds the dirt alarm threshold, and in necessary, reads the history of the analog value signals of the dirt extent of the translucent window stored in the storage part so as to display a trend graph.

54. 发明专利

JP2002015383A FIRE DETECTOR FOR TUNNEL 失效
公开(公告)号：JP2002015383A
公开(公告)日：2002-01-18
申请号：JP2000198186
申请日：2000-06-30
申请人： HOCHIKI CO
发明人： AIZAWA MASATO , ASANO ISAO , MATSUKUMA HIDENARI , SHIMA YASUSHI , KAWABATA YOSHIMI , NEMOTO MASAHIKO
IPC分类号： G08B17/12
摘要： PROBLEM TO BE SOLVED: To facilitate replacement of a fire detector, and to enable water proofing simply and surely. SOLUTION: This fire detector for a tunnel is fitted in a storing box 1 installed on the tunnel wall surface, and formed by crimping and connecting a lead-in signal wire 7 drawn from the outside, a lead-out signal wire 8 for drawing out to the outside, and a signal wire 6 for the detector drawn out from the detector body 2, respectively in the storing box. In the detector, a waterproof connector 5 composed of a receptacle mounted on the detector body and a plug mounted on the signal wire 6 for the detector detachable relative to the receptacle is installed on the detector body 2.

55. 发明专利

JP2001188974A FIRE DETECTOR AND FOULING COMPENSATING METHOD FOR FIRE DETECTOR 失效
公开(公告)号：JP2001188974A
公开(公告)日：2001-07-10
申请号：JP37480499
申请日：1999-12-28
申请人： HOCHIKI CO
发明人： MATSUKUMA HIDENARI , SHIMA YASUSHI , NEMOTO MASAHIKO , AIZAWA MASATO , ASANO ISAO , MIZOBUCHI MANABU , KAWABATA YOSHIMI , MATSUOKA NAOYA , KAWAGUCHI KEIICHI
IPC分类号： G08B17/12 , G01J1/02 , G08B17/00
摘要： PROBLEM TO BE SOLVED: To provide a fire detector and a fouling compensating method for the fire detector by which the performance of automatic compensating function for the fouling of a transparent window provided in the front of a detector sensor is greatly improved with simple constitution. SOLUTION: The fire detector is equipped with a 1st detection part DET1 which monitors a 1st fire monitoring area, a 2nd detection part DET2 which monitors a 2nd fire monitoring area, and a signal processing part PRO which decides that a fire takes place according to the output signal of the 1st detection parts DET1 and 2nd detection part DET2 and also controls the operation states of the 1st and 2nd detection parts. The 1st and 2nd detection parts DET1 and DET2 are equipped with sensor parts SEN1 and SEN2 each of which is composed of plural photodetecting elements and light-transmissive windows TG1 and TG2, and the signal processing part PRO adjusts the number of outputs of photodetecting elements according to how much the light-transmissive windows TG1 and TG2 are fouled.

56. 发明专利

JP2001175967A FLAME DETECTOR 失效
公开(公告)号：JP2001175967A
公开(公告)日：2001-06-29
申请号：JP36004299
申请日：1999-12-17
申请人： HOCHIKI CO
发明人： MATSUKUMA HIDENARI , SHIMA YASUSHI , NEMOTO MASAHIKO , AIZAWA MASATO , MIZOBUCHI MANABU , ASANO ISAO , KAWABATA YOSHIMI
IPC分类号： G08B17/12 , G01J1/02
摘要： PROBLEM TO BE SOLVED: To provide a flame detector, with which a noise component contained in a detecting signal outputted from a detecting sensor is suppressed in simple configuration, an original flame detecting component is satisfactorily extracted and amplified and a flame is more exactly decided. SOLUTION: This flame detector has a sensor part SEN provided with plural photodetectors 10a-10d for converting infrared energy to an electric signals and outputting them, a filtering part FLT for passing only signal components Aa-Ad of a prescribed frequency band out of respective detecting signals Sa-Sd outputted from the sensor part SEN, an adding and amplifying part AMP for adding (integrating) the signal components Aa-Ad and amplifying the signals and a signal processing part PRO for deciding the flame from amplified output from the adding and amplifying part AMP.

57. 发明专利

JPH11214183A LIGHT EMITTING CIRCUIT 失效
公开(公告)号：JPH11214183A
公开(公告)日：1999-08-06
申请号：JP1059698
申请日：1998-01-22
申请人： HOCHIKI CO
发明人： ASANO ISAO , NAKAJIMA SATOSHI
IPC分类号： G08B17/103 , G08B29/18 , H05B33/08 , H05B37/02
摘要： PROBLEM TO BE SOLVED: To provide a light emitting circuit which can provide controllable luminance over a wide range and can control luminance with high precision even in a case of low level luminance. SOLUTION: An analog voltage AV of 0 to 2 V is output from a D/A converter 20 and is given to a voltage current conversion part 30 in accordance with a digital value DV of 0 to 31 given from a light emitting control part 10. A drive current DI output from the voltage current conversion part 30 is controlled in 1 mA unit in a scope of 0 to 31 mA in accordance with the digital value DV. On the other hand, a drive current DI1 of a voltage current conversion part 40 is controlled in 4 mA unit in a scope of 0 to 124 mA, and a drive current DI1 of a voltage current conversion part 50 is controlled in 20 mA unit in a scope of 0 to 620 mA. Consequently, it is possible to control luminance of an LED 1 precisely over a wide scope even at a low level by turning on and off and controlling the voltage current conversion parts 40, 50 by scope specifying signals C1, C2.

58. 发明专利

JPH07234979A HEAT SENSOR 失效
公开(公告)号：JPH07234979A
公开(公告)日：1995-09-05
申请号：JP2769194
申请日：1994-02-25
申请人： HOCHIKI CO
发明人： ASANO ISAO
IPC分类号： G01K7/24 , G08B17/06
摘要： PURPOSE:To quickly switch a constant current and also to reduce the error of the constant current value when the constant currents of plural levels are applied to a thermistor for detection of temperatures. CONSTITUTION:The constant voltage E' is applied to the plus (+) terminal of a differential amplifier OP by the resistances R11 and R12. Meanwhile the analog switches S1, S2 and S3 and the resistors R11-R18 are connected to the output terminal of the amplifier OP to apply a constant current I having different levels for each detected temperature area to a thermistor TH. So that the characteristic of the TH can be detected in a linear resistance area. The switches S1-S3 are turned on or off according to the environment temperatures. Thus the synthetic resistance value of resistors R11-R18 are changed and then the value of the current I is changed.

59. 发明专利

JPH06337995A HEAT SENSOR 失效
公开(公告)号：JPH06337995A
公开(公告)日：1994-12-06
申请号：JP12651393
申请日：1993-05-28
申请人： HOCHIKI CO
发明人： ASANO ISAO
IPC分类号： G08B17/06
摘要： PURPOSE:To make it possible to detect the disconnection of a thermistor at the time of a testing a heat sensor. CONSTITUTION:When the non-inversion terminal (+) of a differential amplifier OP is set up to a low level at the time of a test, the base current iB of a transistor(TR) Q2 is reduced and its collector current iC is increased. When the current increment is detected by a resistor R4 and the thermistor TG is not disconnected, the output signal of a comparator 1 is turned to a high level in a room temperature state and an alarm is generated. When the thermistor TH is disconnected, no alarm is generated.

60. 发明专利

JPH06243362A THERMAL SENSOR 失效
公开(公告)号：JPH06243362A
公开(公告)日：1994-09-02
申请号：JP2382293
申请日：1993-02-12
申请人： HOCHIKI CO
发明人： ASANO ISAO
IPC分类号： G08B17/00 , G08B17/06
摘要： PURPOSE:To improve the reliability of the thermal sensor using a thermistor which decreases in resistance value as the temperature rises as a heat sensing element by preventing the malfunction of disconnection detection even at low temperature where the resistance value of the thermistor is extremely large. CONSTITUTION:A constant temperature detecting circuit 1 detects a fire from variation in characteristics of the thermistor 4 which decreases in resistance value as the ambient temperature rises and sends a fire detection signal, and a comparator circuit 5 for disconnection detection detects the disconnection of the thermistor 4 and sends out a fire detection signal; and the thermal sensor is provided with a malfunction preventing circuit equipped with a transistor 6, a thermistor 7, and a resistor R1 so as to inhibit the comparator circuit 5 for disconnection detection from functioning when the resistance value of the thermistor 4 becomes extremely large at the time of low temperature similarly to a disconnection state.

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