Abstract: There is provided a key structure of an operation section of an electronic device that can avoid an occurrence of operational errors of erroneously pressing down an operation key and can reliably secure a large area for input operations and for indicating information. The key structure of the operation section of the electronic device having a plurality of the operation keys 14, 14, . . . arranged in parallel in a manner to be adjacent to one another. The operation portion having a step height (wall surface 23) is formed in the operation key that can perform input operations by being pressed down with a finger of an operator. The operation portion of the operation key is made up of a higher step surface located in a higher level portion in a pressed-down direction and a lower step surface formed at least on an adjacent side where the operation keys are adjacent to one another in a level portion lower than the higher step surface in the pressed-down direction.

Abstract: There is provided a key structure of an operation section of an electronic device that can avoid an occurrence of operational errors of erroneously pressing down an operation key and can reliably secure a large area for input operations and for indicating information. The key structure of the operation section of the electronic device having a plurality of the operation keys 14, 14, . . . arranged in parallel in a manner to be adjacent to one another. The operation portion having a step height (wall surface 23) is formed in the operation key that can perform input operations by being pressed down with a finger of an operator. The operation portion of the operation key is made up of a higher step surface located in a higher level portion in a pressed-down direction and a lower step surface formed at least on an adjacent side where the operation keys are adjacent to one another in a level portion lower than the higher step surface in the pressed-down direction.

Abstract: A portable telephone includes a lower case and elastic sheet, an operation button portion component, and an operation button illuminating light source. Predetermined openings are formed in each of the lower case and elastic sheet to arrange a plurality of front surface operation buttons and plurality of side surface operation buttons such that the openings are in one-to-one correspondence with the operation buttons. The operation button portion component is arranged by bending along inner sides of front and side surfaces of the lower case and elastic sheet. The operation button portion component is obtained by fixing the respective operation buttons on an elastic sheet with a predetermined design. The operation button illuminating light source is arranged on a circuit board frame to be incorporated in the portable telephone and illuminates the front surface and side surface operation buttons. A method of manufacturing the portable telephone is also disclosed.

Abstract: A portable telephone includes a lower case and elastic sheet, an operation button portion component, and an operation button illuminating light source. Predetermined openings are formed in each of the lower case and elastic sheet to arrange a plurality of front surface operation buttons and plurality of side surface operation buttons such that the openings are in one-to-one correspondence with the operation buttons. The operation button portion component is arranged by bending along inner sides of front and side surfaces of the lower case and elastic sheet. The operation button portion component is obtained by fixing the respective operation buttons on an elastic sheet with a predetermined design. The operation button illuminating light source is arranged on a circuit board frame to be incorporated in the portable telephone and illuminates the front surface and side surface operation buttons. A method of manufacturing the portable telephone is also disclosed.