The pgUp key is the abbreviation of PageUp, also called the page up key. The corresponding key is PageDown, which is the page down key. It is located in the functional area above the arrow keys; when browsing large pages When working with documents, it is difficult to position them by dragging them with the mouse. You can press these two keys to view them page by page; they can also be used as shortcut keys in some software.
Microsoft has patented the "Page Up" and "Page Down" buttons. The software giant applied in 2005 and it was officially approved on August 19, 2008.
U.S. Patent No. 7,415,666 is described as "a method and system for allowing a document viewer to accurately scroll a document, such as scrolling a page, regardless of whether the document is enlarged or whether the viewer has browsed All or part of one page can be switched directly to the next page. "The patent lists "inventors" including Timothy Sellers, Heather Grantham and Joshua Dersch.
Keyboard keys:
In order to adapt to the needs of different users, the conventional keyboard has three functions: CapsLock (letter case lock), NumLock (numeric keypad lock), and ScrollLock (scroll lock key). There are three indicator lights (some wireless keyboards have omitted these three indicator lights), indicating the current status of the keyboard. These indicator lights are generally located in the upper right corner of the keyboard, but some keyboards use indicator lights built into the keycaps. This design makes it easier to judge the current status of the keyboard, but the process is relatively complex, so most ordinary keyboards do not use this design.
Panel area, Num numeric auxiliary keyboard area, F key function keyboard area, control key area, and a shortcut key area for multi-function keyboard.
The keyboard circuit board is the control core of the entire keyboard. It is located inside the keyboard and is mainly responsible for key scanning identification, encoding and transmission interfaces.
You can see the key plunger on the back of the keycap, which is directly related to the life of the keyboard, and its friction coefficient is directly related to the feel of the keys.