To solve problems of a conventional control panel wherein it is not easy to operate the control panel because the control panel is fixed to a tray table and the relative position of the panel is displaced as an operator moves, and it is not easy to operate an electronic display screen because it is necessary to concentrate the operator's eyes and attention on the operation in dividing/selecting sections with a marker on the electronic display screen, making the operation hard because the relative position of the operator to the screen is displaced as the operator moves.
A touch screen for controlling the posture is turned around the tray table of the chair unit for dentistry, and the touch screen itself can be rotated and inclined forward/backward and left/right. Further, the tray table has a mechanism to lock the tray table in any set posture.
NISHIYAMA FUMIO
KOBAYASHI TATSUO