| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that the number of arranged operation keys is increased, that an operation panel is inclined to be large and that an operation panel surface is also in disorder, following multifunction in recent years even though a conventional operation panel is provided with various operation keys such as a mode switching key and a single action key. SOLUTION: This panel is provided with signal action keys 29 being a plurality of 1st keys, a single action cover 28 covering the plurality of keys 29 in an openable and closable way and a mode switching key 25 as a 2nd key provided in the cover 28, and one or more optional single action keys 29 among the plurality of keys 29 can be pressed down by performing depression operation of the key 25 while the cover 28 is closed.
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