| 摘要 |
PROBLEM TO BE SOLVED: To improve the operability of key arrangement for performing an arithmetical operation in small electronic equipment that is portable and can be operated with one hand. SOLUTION: In this portable small electronic equipment, arithmetical operation keys for inputting an instruction that performs a calculation of an arithmetical operation and numerical keys for inputting a numeric for performing an arithmetical operation are arranged in a circular shape centering on a '=' key. Namely, arithmetical operation keys are arranged centering on the '=' key, and the numerical keys are arranged in a circular shape on the outer side of the arithmetical operation keys. Also, the '=' key is provided with a convex pin 4, and a rib 5 is also respectively provided between a '0' key and a '1' key and between a '5' key and a '6' key. |
