Electrical resistors – With cooling gas or liquid circulation
Patent
1992-07-07
1994-06-14
Lateef, Marvin M.
Electrical resistors
With cooling gas or liquid circulation
338 25, 338 51, 338293, H01C 108, H01C 304, H01C 312
Patent
active
053213823
ABSTRACT:
A thermal type flow rate sensor comprising a sensor chip having a rectangular shape. The sensor chip is supported between supporting pins through ribbon-like leads connected to opposite ends of the sensor chip. The ribbon-like leads serve to correctly locate the surface of the sensor chip with respect to flow of fluid. The surfaces of the sensor chip is formed with a thin film heater. A heater portion of the thin film heater comprises a plurality of straight portions and a plurality of turn portions connecting the straight portions to each other. Each turn portion is formed in a smoothly curved shape to avoid the concentration of electric currents and is disposed at an end portion of the sensor chip which has a comparatively low temperature. This structure is effective in preventing generation of cracks in the turn portions. In addition, the plurality of straight portions are alternatively inclined to effectively utilize the surface of the sensor chip to form a long heating portion.
REFERENCES:
patent: 4129848 (1978-12-01), Frank et al.
patent: 4146957 (1979-04-01), Toenshoff
patent: 4703302 (1987-10-01), Hino et al.
patent: 4705713 (1987-11-01), Ohta et al.
patent: 4906965 (1990-03-01), Murata et al.
patent: 5053740 (1991-10-01), Schultz et al.
Hosokawa Norikazu
Kohno Yasushi
Mizukoshi Masahito
Ota Shinji
Lateef Marvin M.
Nippondenso Co. Ltd.
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