US 5,206,796 A · Electronic instrument with EMI/ESD shielding system

Abstract

An electronic instrument is provided with a shielding system consisting of two metallic shields press fitted into plastic instrument case parts without the need for any additional parts to provide electrical and mechanical attachment. In one embodiment, a bottom shield is press fitted onto protuberances inside of a lower case part and electrically connected to a common jack base on a circuit board within the instrument by a vee spring on the bottom shield. A top shield is press fitted into a capturing region of a switch support case part and includes an extension arm and extension ring that is mechanically held by case screws and guides already required by the plastic case. In that position, the extension ring is held in electrical contact with a common pad on the circuit board, the common pad being in electrical contact with a common trace, a common area, and the common jack base.

Claims9

Dependent claims

An electronic instrument comprising:

an instrument case including a first case part and a second case part,
a circuit board disposed in the instrument case, the circuit board embodying electronic circuitry that includes a common (ground) region comprising a common area on the circuit board and a common jack connected to the common area,
a first metallic shield part press fitted to the first case part and comprising a vee spring that contacts the common jack to provide electrical contact with the common region of the electronic circuitry, and
a second metallic shield part press fitted to the second case part and having a contact portion in electrical contact with the common region.

1 more element

Dependencies are inferred from the claim text.

Electronic instrument with EMI/ESD shielding system

Life of this patent

Electronic instrument with EMI/ESD shielding system

Life of this patent

Abstract

Claims9