| 摘要 |
PURPOSE:To prevent static electricity being accumulated in a human body, to improve workability and to contrive to realize cost-down by making electrically conductive at least one of a grounding conductive portions extended from a keyboard, the chassis of the main body of the heating unit, and claws formed on an operating panel frame. CONSTITUTION:When an operating panel frame 13 is mounted on a panel base 11, claws 13a and 13b are bent to mount the same. Upon this occasion, one 13b of the claws which has been singly elongated, is brought into contact with a grounding conductive portion 14 extended from a keyboard 12. On the claw 13b is made contact a back plate 18 for mounting a printed plate board 17 and fixing the key board 12. Thus, the key board 12 and the operating panel frame 13 assume an electrically conductive state with a main chassis body 19 which is grounded through the back plate 18. Accordingly, the static electricity charged in the body of the user is discharged by the grounding to a control circuit, and no discharge is carried out to a control circuit, and electronic parts are protected. |
