| 摘要 |
PROBLEM TO BE SOLVED: To provide an oxygen enrichment apparatus which can prevent a display of the prescribed information from being difficult to see. SOLUTION: The oxygen enrichment apparatus 1 includes a display means 2 to display the prescribed information, a sensing means 3 which senses the surrounding brightness of the above display means, a switching means 4 to change the surrounding brightness of the above display means 2, wherein the above switching means 4 is equipped with the first threshold which is related to the above surrounding brightness sensed by the above sensing means 3 and for changing the brightness of the above display means 2 from a brighter part to a darker part and the second threshold which is related to the above surrounding brightness obtained by the above sensing means 3 and for changing the brightness of the above display means 2 from the darker part to the brighter part, and the value of the second threshold is larger than the value of the first threshold. COPYRIGHT: (C)2005,JPO&NCIPI
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