| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption by varying supply voltage to a fluorescent display tube. SOLUTION: A control device 9 is provided with a fluorescent display tube 2 and an input part 7 of SW, a microcomputer 3, a converter 4, drivers 11, 12, or the like, and all situations are displayed on the fluorescent display tube 2 depending on operation of a SW and a state of a hot-water supplier. In the fluorescent display tube 2, each voltage of an anode, a grid, and a filament is supplied from the converter 4, the converter 4 is controlled by the microcomputer 3, supply voltage to the fluorescent display tube 2 can be varied linearly by a command from the microcomputer 3. Display contents of the fluorescent display tube 2 can be varied by a command from the microcomputer 3 through drivers 11, 12. An variable time of supply voltage can be set arbitrarily by the SW, a setting time is stored in E2PROM5, and at the set time, a command is issued from the microcomputer 3, and supply voltage to the fluorescent display tube 2 is varied.
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