Opto-acoustic transducer and telephone receiver
OwnerSeymour Edelmaninventor
Life of this patent
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Abstract
An optical fiber element of low density, low heat capacity, a large coefficient of thermal expansion, and a large Young's modulus varies in light transmissivity gradually between its ends from high transmissivity to opacity, whereby power modulated light transmitted through the fiber element is absorbed to cause a change in temperature of the fiber element and a resultant thermal expansion and contraction thereof. As a transducer in a telephone receiver, a light absorbing fiber element or group of such elements is coupled between the optical fiber waveguide in the receiver and a resiliently mounted acoustical diaphragm which is caused to respond over the audible range.
Claims14
A transducer element for use in a telephone receiver or the like including sound producing means and comprising at least an optical fiber element adapted to transmit and absorb modulated light and having its light transmissivity gradually decreasing from a high level at one end of the fiber element to substantially zero transmissivity at the other end of the element, whereby modulated light absorbed by the fiber element causes thermal expansion and contraction of the element longitudinally for driving said sound producing means.
A telephone receiver including an earpiece, a transmission line for modulated light leading to the earpiece, acoustic transducer means resiliently mounted on the earpiece, and at least one optical fiber transducer element connected between said transducer means and a terminal point on said transmission line, said optical fiber transducer element having diminishing modulated light transmissivity between its ends and expanding and contracting lengthwise to drive said transducer means in response to absorption of modulated light by the transducer element.
In a telephone receiver, a resiliently supported earpiece acoustic transducer means, a transmission line for modulated light connected with the receiver and having an end portion spaced from said transducer means, and optical fiber light absorbing thermally expansible and contractable transducer means connected between said end portion and said acoustic transducer means to drive the latter.
Dependencies are inferred from the claim text.