"page up" is a key on the keyboard, which is used to turn pages up. In a text editing environment, pressing this keyboard can turn the document forward by one page. Microsoft has obtained patents for "Page Up" and "Page Down" buttons.
American patent. No.7,465,438+05,666 is described as "a method and system for a document viewer to accurately scroll a document, such as scrolling a page, regardless of whether the document is enlarged or not and whether the viewer browses all or part of the page, and can directly switch to the next page.
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The shape of keyboard can be divided into standard keyboard and ergonomic keyboard. The ergonomic keyboard separates the left-hand keyboard from the right-hand keyboard, which is specified by fingering and forms a certain angle, so that the operator does not have to consciously clamp the arm and maintain a more natural shape. The keyboard designed by Microsoft Company is named NaturalKeyboard. For users who are used to typing blindly, such as letters "G" and "G", it can effectively reduce the false hit rate of left-handed keyboard and right-handed keyboard.
Some ergonomic keyboards also intentionally increase the area of commonly used keys, such as the space bar and enter key, and add a hand guard at the lower part of the keyboard to support the previously suspended wrist and reduce the fatigue caused by the wrist hanging for a long time. These can be regarded as humanized designs.