CONTROL KNOB STRUCTURE OF INSTRUMENT

PROBLEM TO BE SOLVED: To provide control lever structure for controlling various switches of an instrument which can reduce the physical size of a control knob part while using a low-cost resin spring.SOLUTION: Control knob structure of an instrument includes a control knob 5 and a switch 7 which is pressed by the control knob 5 to perform a switch operation. A spiral resin spring part 25e which is continuously integrally molded with the control knob 5 is formed longitudinally with the control knob 5. By pressing the control knob 5, the switch 7 is operated by pressing with a columnar projection 25e2 while resisting against reaction forces of the switch 7 and the resin spring part 25e. Thus, a control knob part including the control knob 5 and the resin spring part 25e is not widened laterally so as to be able to reduce the space. A number 22 is a fulcrum part which inclines the control knob 5 by reaction force, and numbers 25a and 25b are elastic claws used for assembling. After the assembling, the control knob 5 is brought into partially contact with an open hole 10 of a lens member 9 by the reaction force.