Semiconductor photocoupler with changing capacitance
First Claim
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1. A photocapacitance semiconductor photocoupler comprising:
- a single light emitting element for emitting light when excited by driving current, and a light receiving element for receiving the light emitted by said single light emitting element;
whereina wavelength of the light emitted by said single light emitting element changes as a function of intensity of said driving current,a capacitance measured across said light receiving element changes as a function of the wavelength of the received light, said capacitance ceases to change when said received light disappears, and is maintained until a new light is emitted from said single light emitting element and received by said light receiving element, said capacitance measured across said light receiving element changing to a new value corresponding to a new wavelength of said new light.
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Abstract
A semiconductor photocoupler is composed of a light emitting element and a light receiving element. Wavelength of emitted light changes as a function of exciting current intensity of the light emitting element, and capacitance of the light receiving element changes as a function of wavelength of receiving light and ceases the capacity change as the receiving light disappears. Signals are transmitted in current-light-capacity type transmission with memory action in the light receiving element.
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Citations
14 Claims
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1. A photocapacitance semiconductor photocoupler comprising:
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a single light emitting element for emitting light when excited by driving current, and a light receiving element for receiving the light emitted by said single light emitting element; wherein a wavelength of the light emitted by said single light emitting element changes as a function of intensity of said driving current, a capacitance measured across said light receiving element changes as a function of the wavelength of the received light, said capacitance ceases to change when said received light disappears, and is maintained until a new light is emitted from said single light emitting element and received by said light receiving element, said capacitance measured across said light receiving element changing to a new value corresponding to a new wavelength of said new light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A semiconductor photocoupler comprising:
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a single light emitting element driven by a driving current which has a changeable current value and emitting light which has an infrared light component and a red light component, a ratio of said infrared light component to said red light component being changed in accordance with a change in current value of said driving current; and a light receiving element receiving the light emitted by said light emitting element, said light receiving element having a capacitance which is changed in accordance with said ratio of said infrared light component to said red light component so that the change in current value of said driving current for driving said light emitting element is represented by the change in capacitance of said light receiving element. - View Dependent Claims (12, 13, 14)
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Specification