| 摘要 |
PROBLEM TO BE SOLVED: To permit a blind person to easily execute a min. operation when he uses a new telephone set by providing different projections for identifying the functions of respective operation switches in the plural operation switches themselves or in the periphery of the operation switches in accordance with the functions of plural operation switches. SOLUTION: When a call originating key 6, an end key 12 and a power source key 19 are provided with the round projections in the respective keys as a guide, the power source key 19 is provided with one round projection 20. The call originating key 6 is provided with two round projections 7 and the end key 12 is with three round ones 13. That is, the projections 7, 13 and 20 are round but the power source key 19, the call originating key 6 and the end key 12 are identified by the number of the projections. The character of a 'power source' in the power source key 19 and the mark of the telephone set in the call originating key 6 are printed but are not identified by the blind person. The projections like these are provided so that identification by finger is enabled. |
