| 摘要 |
The operability of the various kinds of operation buttons that carry out designated functions in a portable information acquisition device is improved so as to make the device user-friendly. Pairs of operation buttons in which each pair carries out a similar kind of function are configured with one operation button of each pair provided on the left side of the device main body, and one operation button provided on the right side. Further, operation buttons that carry out similar kinds of functions are provided in a plurality of opposing configuration of pairs on both the left and right sides, respectively. When the operation buttons are formed respectively into pairs carrying out different functions, in which each pair carries out a similar kind of function, the operation buttons are arranged in symmetrical positions on the left and right. Furthermore, various kinds of operation buttons are provided above the center axis dividing the device into upper and lower parts. Also, when two operation buttons that carry out different functions are arranged adjacent to one another, the operation button positioned to be operated by the tip of the finger is made larger than the other buttons.
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