Photo meter
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United States of America Patent
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N/A
Issued Date -
Jul 31, 2008
app pub date -
Sep 11, 2007
filing date -
Jan 31, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention discloses a photo meter comprising a light emitting device, a photo sensor, and a controller. The controller has a look-up table, wherein the look-up table records a plurality of control signals and a plurality of standard lightness values. The controller is used for transmitting a plurality of control signals for controlling the light emitting device to generate a plurality of lightness. The photo sensor is used for sensing the lightness to generate a plurality of corresponding lightness values. Afterward, the controller receives the lightness values from the photo sensor and then broadcasts an alert signal to notify the user that the photo sensor should be replaced if the difference between each of the lightness values and each of the corresponding standard lightness values recorded in the look-up table is greater than a threshold value.
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