Thermal flow meter
First Claim
1. An air flow meter comprising a sensor element,the air flow meter comprising a chip package, whereinthe chip package includes a drive circuit electrically connected to the sensor element,the chip package includes a chip capacitor that protects the drive circuit,the chip package includes a metal lead frame on which the drive circuit and the chip capacitor are mounted,the chip package includes a resin mold within which the drive circuit and the chip capacitor are encapsulated,wherein the lead frame includesan input-output terminal for communicating signal with the outside on the side opposite to the sensor element with respect to the drive circuit;
- a mounting portion on which the drive circuit is mounted;
wherein the input-output terminal comprisesa first terminal is formed integrally with the mounting portion;
a plurality of second terminals is formed independently of the mounting portion and electrically connected to the drive circuit through wire bonding,wherein the plurality of second terminals are disposed on both sides of the first terminal, andwherein the chip capacitor is mounted directly on the first terminal and the second terminal via an electrically conductive adhesive, so that the chip capacitor is fixed directly to the lead frame.
1 Assignment
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Accused Products
Abstract
A thermal-type flowmeter includes a chip package. The chip package is formed through encapsulation with a resin of a sensor element, a drive circuit, a metal lead frame adapted to have mounted thereon the sensor element and the drive circuit, and a temperature detecting element. The chip package has an exposed structure in which a surface of the sensor element having the diaphragm is exposed. The temperature detecting element is mounted on the lead frame via an electrically conductive member.
23 Citations
10 Claims
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1. An air flow meter comprising a sensor element,
the air flow meter comprising a chip package, wherein the chip package includes a drive circuit electrically connected to the sensor element, the chip package includes a chip capacitor that protects the drive circuit, the chip package includes a metal lead frame on which the drive circuit and the chip capacitor are mounted, the chip package includes a resin mold within which the drive circuit and the chip capacitor are encapsulated, wherein the lead frame includes an input-output terminal for communicating signal with the outside on the side opposite to the sensor element with respect to the drive circuit; -
a mounting portion on which the drive circuit is mounted; wherein the input-output terminal comprises a first terminal is formed integrally with the mounting portion; a plurality of second terminals is formed independently of the mounting portion and electrically connected to the drive circuit through wire bonding, wherein the plurality of second terminals are disposed on both sides of the first terminal, and wherein the chip capacitor is mounted directly on the first terminal and the second terminal via an electrically conductive adhesive, so that the chip capacitor is fixed directly to the lead frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification