| 摘要 |
<p>A push button variable resistor device includes a hollow push button seat member confining a receiving space 10, and at least one resistor piece (3, 3a, 3b, 3') fixed inside the seat member. The resistor piece (3, 3a, 3b, 3') has a contact portion (30, 30', 3d) and at least one leg portion ( 32, 34, 3f) projecting outward through a base portion 12 of the seat member. A spiral spring resistor (4, 4') is disposed inside the receiving space 10 of the seat member above the resistor piece (3, 3a, 3b, 3d). The spring resistor (4, 4') has a plurality of concentric turns of varying diameters. A push button 5 is slidably fitted through a button opening 23 of the seat member. The spring resistor (4, 4') has a topmost turn 41 cooperatively associated with the push button 5. The push button 5 is externally pushed to compress the spring resistor (4, 4') to cause the concentric turns to contact the resistor piece (3, 3a, 3b, 3d). The contact area between the spring resistor (4, 4') and the resistor piece (3, 3a, 3b, 3') varies according to the degree of depression of the push button 5 to correspondingly vary the output resistance of the variable resistor device.</p> |
