| 摘要 |
A finger guard for use with an electronic device is provided for restricting physical access to a component of the electronic device having an uninsulated surface adapted to carry a voltage. The apparatus includes a housing which defines a first opening, a nd which is adapted to mount to the electronic device so that the first opening permits passage of passive infrared energy and ambient light to the component. The apparatus further includes a projection arrangement, extending from the housing, which limits physical access to the surface of the component through the first opening, and defining a second opening through which the infrared energy can enter and pass through the first opening to th e component. An electronic circuit can also be provided which limits current being provided to an uninsulated component, such as an infrared or ambient light detector of the electronic device, from a circuit of the electronic device. The apparatus includes a resistive element which couples a terminal of the uninsulated component to ground, and a capacitive element which also couples the terminal of the uninsulated component to ground. The resistive a nd capacitive elements have resistance and capacitance values, respectively, which limit t he current to less than about 500.mu.A.
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