| 摘要 |
An optical switch for use as a modular keyboard switch designed to provide tactile and audible feedback to the keyboard operator. The switch includes an opaque housing in which a light emitting device and a light activated detector are mounted. A "U" shaped spring shutter rests within the housing between the emitter and detector and has an aperture through which light from the emitter may illuminate the detector. A spring loaded key stem moves longitudinally within the housing and is designed to penetrate the open end of the shutter. The key stem and shutter are shaped such that as the key stem is depressed the upwardly extending arms of the shutter are at first forced outward by projecting shoulders on the key stem and then snap back along upwardly sloping surfaces of the shoulder, thereby causing the shutter to spring upwards and block the optical path between the emitter and detector. The snap action of the shutter causes an audible "click" and also provides tactile feedback to the operator.
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