초록 ▼

The present invention relates to an ambient light detector that detects a change in light amount of ambient light. The ambient light detector consists of ambient light detecting means for detecting light entering from circumferences and outputting an electrical signal corresponding to the light amou

The present invention relates to an ambient light detector that detects a change in light amount of ambient light. The ambient light detector consists of ambient light detecting means for detecting light entering from circumferences and outputting an electrical signal corresponding to the light amount thereof; amplifying means for amplifying the output from the ambient light detecting means; signal producing means for producing a slice level signal based on the output from the amplifying means; comparing means for comparing the output of the amplifying means with the slice level signal; and judging means for judging the level of the output from the amplifying means and then outputting a control signal to control the amplifying factor of the amplifying means, according to the judging result. Ambient light can be stably detected without depending on installation mode or external environment.

대표청구항 ▼

[ What is claimed is:] [1.] An ambient light detector, for a system in which a change of state in an ambient environment is detected in terms of a change of ambient light entering from circumferences, the ambient light change tending to vary irregularly, and in which such detection result is utilize

[ What is claimed is:] [1.] An ambient light detector, for a system in which a change of state in an ambient environment is detected in terms of a change of ambient light entering from circumferences, the ambient light change tending to vary irregularly, and in which such detection result is utilized as a base on which a discrimination is to be made for stable control of operation of the system irrespective of the irregularity of the ambient light change, said detector comprising:ambient light detecting means for detecting a level of the ambient light entering from the circumferences and then outputting a detection signal corresponding to the level of the ambient light;amplifying means for amplifying said detection signal output from said ambient light detecting means;judging means for evaluating the level of the output from said amplifying means and then outputting a feedback control signal to control the amplifying factor of said amplifying means according to the evaluation result if the level of the output from said amplifying means is outside of an appropriate range acceptable for subsequent signal processing;signal producing means for producing a slice level signal based on the resultant output from said amplifying means as controlled by said judging means; andcomparing means for comparing said resultant level of output of said amplifying means, which output is received from said amplifying means and is the result of the feedback of said judging means, with the slice level signal produced by said signal producing means and then outputting a control signal corresponding to the comparison result to control the system.