Infrared object detector
First Claim
1. An infrared object detector comprising:
- light receiving means having at least one pair of light receiving lenses on a surface of a printed circuit board, light receiving views of said light receiving lenses intersecting each other to define a plurality of detection areas;
signal processing means having a light receiving element arranged on said printed circuit board, corresponding to each of said light receiving lenses, an amplifier electrically coupled to said light receiving element, a window comparator for comparing an output signal of said amplifier with a reference signal thereof, and a signal converter coupled to said amplifier in parallel with said window comparator for converting said output signal from said amplifier; and
determining means for determining the distance of a detection area where an object is located, through a signal output from said signal processing means.
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Accused Products
Abstract
An infrared object detector, especially for an air conditioner is provided with a light receiving unit including a light block between a pair of hemispherical Fresnel lenses arranged in parallel on a printed circuit board, so that light receiving views intersect each other to thereby define three detection areas. From a signal output from the light receiving unit, the distance to a detected object is determined through a signal processing circuit and a program built in a microcomputer. The rotational speed of a fan in the air conditioner is classified into three stages according to the determined distance, and a command is issued for controlling the operation of an air conditioner according to the number, movements, movement degrees to persons. Therefore, the airflow of the air conditioner is controlled based on the command, thereby performing an optimum air conditioning. Further, the infrared object detector can be applied to a camcorder or a camera, to determine the distance to an object more accurately.
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Citations
12 Claims
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1. An infrared object detector comprising:
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light receiving means having at least one pair of light receiving lenses on a surface of a printed circuit board, light receiving views of said light receiving lenses intersecting each other to define a plurality of detection areas; signal processing means having a light receiving element arranged on said printed circuit board, corresponding to each of said light receiving lenses, an amplifier electrically coupled to said light receiving element, a window comparator for comparing an output signal of said amplifier with a reference signal thereof, and a signal converter coupled to said amplifier in parallel with said window comparator for converting said output signal from said amplifier; and determining means for determining the distance of a detection area where an object is located, through a signal output from said signal processing means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An infrared object detector for an air conditioner, comprising:
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light receiving means having light blocking means between a pair of Fresnel lenses arranged on a surface of a printed circuit board, so that the light receiving views intersect each other to thereby define three detection areas; signal processing means having a pair of light receiving elements disposed corresponding to said Fresnel lenses, an amplifier for amplifying an output signal of each of said light receiving elements, a window comparator for comparing an output signal of said amplifier with a reference signal, and an A/D converter coupled to said amplifier in parallel with said window comparator, for converting the output signal of said amplifier; and a microcomputer for receiving a signal output from said signal processing means, determining a distance area where an object is located, and outputting a command signal for controlling the operation of an air conditioner according to the distance. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification