Operation member provided in electronic device, and electronic device

1. An operation member of an electronic device, which is provided in the electronic device and can be operated by a user with a finger, comprising:

an operation stick including a column portion and an operated portion at a tip of said column portion:

a cushion portion forming a top surface of said operated portion, said cushion portion including, on a surface thereof, a pressed surface that is pressed by the finger of the user;

a base portion defining the upper portion of said column portion, which is supported to be movable; and

a frame portion formed in the base portion to surround an outer periphery of the cushion portion, and an inner surface of the frame portion is in contact with an outer peripheral edge of the cushion portion, the frame portion and the base portion being formed of a material having a higher rigidity than that of the cushion portion.

2. The operation member according to claim 1 , wherein the operation member is an operation stick having a column portion with a tip end on which the base portion is formed.

3. The operation member according to claim 2 , wherein the frame portion is formed over an entire periphery of the cushion portion.

4. The operation member according to claim 2 , wherein

one of the cushion portion and the base portion is provided with a protrusion protruding toward the other of the cushion portion and the base portion, and

the other of the cushion portion and the base portion is provided with a hole into which the protrusion is fitted.

5. The operation member according to claim 4 , wherein the protrusion is provided in the cushion portion, and the hole is provided in the base portion.

6. The operation member according to claim 5 , wherein

the hole penetrates through the base portion, and

the protrusion reaches a side of the base portion which is opposite to the cushion portion through the hole, and includes, at an end thereof, an engagement portion caught on the base portion.

7. The operation member according to claim 6 , including a plurality of protrusions each functioning as the protrusion,

the plurality of protrusions are annularly arranged to surround a center line of the column portion, and

the engagement portions of the protrusions are formed into an annular shape.

8. The operation member according to claim 1 , wherein the material of the cushion portion has softness such that an outer shape thereof widens out when the surface of the cushion portion is pressed.

9. The electronic device having the operation member according to claim 1 .

10. The electronic device according to claim 9 , including:

an operation stick functioning as the operation member, the operation stick including a column portion, and an operated portion provided at a tip end of the column portion and including the base portion and the cushion portion, the operation stick being movable in a radial direction of the column portion;

a case accommodating a mechanism for supporting a base of the column portion therein and having an opening formed thereon through which the column portion passes; and

a cover portion provided to the operation stick and positioned toward the case from the operated portion, the cover portion widening in the radial direction of the column portion to cover a gap between an outer peripheral surface of the column portion and an edge of the opening of the case.

11. The electronic device according to claim 10 , further comprising

a housing which accommodates the case and has an opening formed thereon, the opening of the housing having a larger size than that of the opening of the case, the operation stick protruding through the opening of the housing,

wherein the cover portion is positioned toward an outside of the housing than an inner surface of the housing.

12. The electronic device according to claim 11 , wherein an outer peripheral edge of the cover portion is positioned further outwardly in the radial direction than an edge of the opening of the case, and is positioned further inwardly in the radial direction than an edge of the opening of the housing.

13. The electronic device according to claim 10 , wherein the cover portion is connected to the cushion portion.

14. The electronic device according to claim 13 , wherein the cover portion is connected to the cushion portion through a through-hole formed in the base portion.

15. The electronic device according to claim 10 , wherein the cover portion is formed of a flexible material.