Flow Sensors and Manufacturing Method for Same
2 Assignments
0 Petitions
Accused Products
Abstract
A flow sensor includes an auxiliary channel having an opening into which a fluid to be measured is taken; a sensor element that measures the flow of the fluid to be measured; a housing that accommodates electronic parts; and a resin cover. The flow sensor is configured such that junctions of the housing and the cover are formed in locations where first target weld portions, which are formed so that the circuit chamber is surrounded, face each other and second target weld portions, which are disposed for additional reinforcement of the joints, face each other on a bonding face of the housing and a bonding face of the cover with a step being provided. The positioning of the housing and the cover is determined, and the first target weld portions are welded to each other and second target weld portions are welded to each other by way of laser radiation.
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Citations
49 Claims
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1-27. -27. (canceled)
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28. A flow sensor comprising:
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a housing that accommodates an auxiliary channel having an opening into which a fluid to be measured is taken, a sensor element that is disposed in the auxiliary channel and that measures a flow rate of the fluid to be measured and electronic parts that are isolated from the auxiliary channel in a circuit chamber and drive and detect the sensor element; and a resin cover that is joined to the housing and that seals the circuit chamber in an air-tight manner from an atmospheric air, wherein junctions of the housing and the cover are formed in locations where first target weld portions of a first welded section, which is formed so that the circuit chamber is surrounded, face each other and second target weld portions of a second welded section, which is additionally disposed for reinforcement of joints, face each other on a bonding surface of the housing and a bonding surface of the cover respectively with a step provided such that a gap between the second target weld portions is larger than a gap between the first target weld portions; and
the housing and the cover are set in position, thereby the first target weld portions and the second target weld portions being welded to each other by way of laser radiation. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A manufacturing method of a flow sensor comprising the steps of:
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forming junctions of a housing, which accommodates an auxiliary channel having an opening into which a fluid to be measured is taken, a sensor element that is disposed in the auxiliary channel and that measures a flow rate of the fluid to be measured and electronic parts that are isolated from the auxiliary channel in a circuit chamber and drive and detect the sensor element, and a resin cover in locations where first target weld portions of a first welded section, which is formed so that the circuit chamber is surrounded, face each other and second target weld portions of a second welded section, which is additionally disposed for reinforcement of joints, face each other on a bonding surface of the housing and a bonding surface of the cover respectively with a step provided such that a gap between the second target weld portions is larger than a gap between the first target weld portions when the cover and the housing are set in position; setting the housing accommodating each of the parts and the cover in position and pressing the housing and the cover; and applying laser radiation from above the cover to the second welded section to make an interval between the second target weld portions welded to each other and then applying laser radiation from above the cover to the first welded section to make an interval between the first target weld portions welded to each other so as to join the cover to the housing. - View Dependent Claims (44, 45, 46, 47, 48)
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49. A manufacturing method of an air-tight casing,
wherein a housing in which electronic parts are accommodated is formed of a resinous material absorptive of laser beam while a cover joined to the housing which hermetically seals the housing internally from an atmospheric air is formed of a resinous material transmissive of laser beam, wherein the method comprises the steps of: -
forming junctions of the housing and the cover in locations where first target weld portions of a first welded section, which is formed so that it peripherally surrounds an opening of the housing, face each other and second target weld portions of a second welded section, which is additionally disposed for reinforcement of joints, face each other on a bonding surface of the housing and a bonding surface of the cover respectively with a step provided such that a gap between the second target weld portions is larger than a gap between the first target weld portions when the cover and the housing are set in position; setting the housing accommodating the electronic parts and the cover in position and pressing the housing and the cover; and applying laser radiation from above the cover to the second welded section to make an interval between the second target weld portions welded to each other and then applying laser radiation from above the cover to the first welded section to make an interval between the first target weld portions welded to each other so as to join the cover to the housing.
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Specification