A Personal Digital Assistant (PDA) with retractable stylus comprises a retractable
stylus, a housing, a stylus slot, and a push portion, wherein a contact pad is
attached to the inner side of the push portion. The retractable stylus comprises
a pen shaft having a release button, a pen body having an opening, and a spring
situated inside the pen body. When an external force is applied to the pen shaft
downward, the spring is compressed until the opening holding the release button;
thus, the stylus is shortened. When the release button is set free from the opening,
the spring elasticity ejects the pen shaft upward; thus, the stylus returns to
the full-length condition. If the stylus is kept in the stylus slot, an external
force applied to the push portion can make the contact pad press the release button;
so the pen shaft is ejected upward by spring elasticity.
