| 摘要 |
<p>A new and improved switch particularly adapted for use with a telephone. More particularly, an electro-optical switch is operable in any ambient light conditions. The switch includes a square wave generator (20) having an output supplied to a photoemitter (22). A photodetector (26) is provided which is disposed in a manner such that light (24) generated from the emitter (22) is received by the detector (26) when the telephone elements are in an aligned first position. The output from the detector (26) is supplied to a logic circuit (30) along with the output from the generator (20). The logic circuit (30) is configured such that when the telephone elements are in the aligned first position, such that the output from the emitter (22) is received by the detector (26), a first output signal is produced. In contrast, when the telephone elements are moved relative to one another, out of alignment, the detector (26) generates an output based on the ambient light conditions, whereby the logic circuit (30) generates a second output signal.</p> |
