| 摘要 |
<p>PURPOSE:To prevent occurrence of a difference in electrostatic capacity between an accurate set value and selected value of a variable capacitor by continuously forming the first electrode and a plurality of second electrodes having different areas in a state where the second electrodes are divided and faced to the first electrodes at prescribed intervals, and then, fitting a contact which is individually brought into contact with the electrodes in a slidable way. CONSTITUTION:A plus electrodes 22 continuous from the 1st electrode 20 is formed in one electrode forming section 18 and minus electrode 23 are formed in the other electrode forming section 19. A plurality of the 2nd electrodes 21 are formed in a state where the electrodes 21 are divided with gaps 25 between each of the electrodes 21 at prescribed intervals in a ring area concentric with the 1st electrode 20. The areas of the second electrodes are successively increased in the arranged direction. When a contact 30 is brought into contact with selected arbitrary one of the second electrodes 21 by sliding the contact on the electrodes 21 by rotation, etc., a capacitance value which is decided by the area of the selected second electrode can be set. Therefore, a difference between a selectively obtained capacitance and a set value can be prevented surely.</p> |
