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(11) | EP 0 327 024 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Rotation operating device of variable resistor |
| (57) A rotation operating device of a variable resistor comprises: a knob (2, 22) to apply
a rotating force from an outside; a supporting member (1, 10) formed with a hole (52)
to rotatably support the knob; and an intermediate member (3) which is rotatably supported
to the supporting member and transfers the rotating force of the knob to a sliding
contact of the variable resistor (4). An upper surface member (51) of the supporting
member is transparent or translucent. An annular groove (53) having both ends is formed
on the inner surface of the upper surface member so as to surround the hole. Both
ends of the annular groove are used as stoppers (54). The upper portion of the knob
passes through the hole and faces the outside of the upper surface member. A first
gear (23) is formed in the lower portion of the knob. The intermediate member has
a bottom surface portion (31) and a peripheral wall (32). A notch (34) is formed in
a part of the peripheral wall. A second gear (33) adapted to be come into engagement
with the first gear is formed in a predetermined range on the inner surface of the
peripheral wall. A position indicating portion (36) is located in the notch of the
peripheral wall and is projected than the upper surface of the peripheral wall and
is movably fitted into the annular groove of the supporting member. The position indicating
portion is coupled with the botton surface portion through a spring member (35).
The bottom surface portion is in engagement (37) with the sliding contact of the variable
resistor supported to the supporting member. |