Apparatus for measuring the degree of rinsing
First Claim
1. An apparatus for measuring the degree of rinsing for use in a washing tub containing clothes to be washed and liquid in which a bubble detergent is dissolved and including stirring means for relatively moving said clothes and liquid, said apparatus comprising:
- a light source disposed at the bottom of the washing tub to transmit light through the liquid;
a first photoelectric converting element disposed at the bottom of the washing tub to receive light emitted by said light source and having an optical path in said liquid for producing a first output signal corresponding to the amount of light received;
a second photoelectric converting element disposed at the bottom of the washing tub to receive light emitted by said light source and having an optical path in said liquid to produce a second output signal corresponding to the amount of light received, said second photoelectric converting element being located at such position that the length of the optical path in said liquid between said light source and said second photoelectric converting element is longer than the length of the optical path in said liquid between said light source and said first photoelectric converting element;
circuit means including feedback means connected between said first photoelectric converting element and said light source so as to control the amount of light emitted thereby such that said first output signal will be constant; and
whereby said second output signal corresponds to the amount of said light transmitted through said liquid.
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Accused Products
Abstract
The apparatus for measuring the degree of rinsing for use in a washing machine is provided with a source of light, a first phototransistor disposed to receive light emitted by the light source for producing a reference signal, a second phototransistor disposed to receive the light from the light source for producing a measuring signal corresponding to the amount of light received and a calculating circuit for arithmetically operating the reference signal and the measuring signal for producing an output signal corresponding to the relative values of the reference signal and the measuring signal. A first optical path between the light source and the first phototransistor and a second optical path between the light source and the second phototransistor are both disposed in rinsing water and the length of the first optical path is set to be longer than the length of the second optical path.
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Citations
9 Claims
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1. An apparatus for measuring the degree of rinsing for use in a washing tub containing clothes to be washed and liquid in which a bubble detergent is dissolved and including stirring means for relatively moving said clothes and liquid, said apparatus comprising:
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a light source disposed at the bottom of the washing tub to transmit light through the liquid; a first photoelectric converting element disposed at the bottom of the washing tub to receive light emitted by said light source and having an optical path in said liquid for producing a first output signal corresponding to the amount of light received; a second photoelectric converting element disposed at the bottom of the washing tub to receive light emitted by said light source and having an optical path in said liquid to produce a second output signal corresponding to the amount of light received, said second photoelectric converting element being located at such position that the length of the optical path in said liquid between said light source and said second photoelectric converting element is longer than the length of the optical path in said liquid between said light source and said first photoelectric converting element; circuit means including feedback means connected between said first photoelectric converting element and said light source so as to control the amount of light emitted thereby such that said first output signal will be constant; and whereby said second output signal corresponds to the amount of said light transmitted through said liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification