Law Offices of David G. Posz
Semiconductor strain sensor
A semiconductor strain sensor in which a sensor element for detecting a strain signal is mounted in a resin package member, which can restrain a creep stress of the package member from affecting to the sensor element. A semiconductor strain sensor is provided with a lead frame integrally molded with a resin package member, and a sensor chip made of silicon. The sensor chip is mounted on one surface of an element mounting portion of the lead frame, and is capable of externally outputting electric signal via a wire in accordance with strain when pressure is applied. An opening portion is provided in the package member, so that the entire area of another surface of the lead frame, where positions beneath the sensor chip, is non-contacted with the package member. Since another surface of the lead frame is non-contacted with the package member at the opening portion, even if the creep occurs in the package member, it can prevent stress (creep stress) undergone in accordance with the creep deformation from being transferred to the sensor chip.
Denso Corporation
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Yasutoshi Seiichiro Inao
Suzuki Ishio Toyoda