Auxiliary keyboard and auxiliary input device

An auxiliary input device for disposing on a tablet PC, comprising:

• an auxiliary keyboard, comprising:
• an insulating board integrally formed, comprising:
• a sheet having a first surface and an opposite second surface, wherein the sheet having a plurality of portions respectively defining a plurality of thru holes penetrating the first surface and the second surface;
• a plurality of resilient supporting portions each having a first end and an opposite second end, wherein the first end of each resilient supporting portion connects the sheet, and the resilient supporting portions are respectively connected to the portions of the sheet;
• and
• a plurality of combined portions respectively connected to the second ends of the resilient supporting portions, wherein the thickness of each combined portion is about 0.05 mm to 1 mm;
• and
• a plurality of conductive keys each defined as a bonded portion and an exposed portion, wherein the bonded portions of the conductive keys are respectively and seamlessly coupled to the combined portions, and the exposed portions are arranged to allow exposure from the insulating board;
• an auxiliary casing having a foldable sheet-like structure, the auxiliary casing having a foldable body, a first connecting portion, and a second connecting portion;
• wherein the first connecting portion and the second connecting portion are respectively arranged on the opposite sides of the foldable body, the first connecting portion is fixed on the auxiliary keyboard, the second connecting portion is fixable onto the tablet PC, and the auxiliary device is adjustable to a desired position or a collapsed position by folding the auxiliary casing;
• wherein when the second connecting portion of the auxiliary device is fixed onto the tablet PC and the auxiliary device is adjusted to the desired position, the foldable body is disposed on a working surface so as to configure the tablet PC at an acute angle relative to the working surface, the second surface of the insulating board is disposed on the tablet PC, each combined portion and a touch panel of the tablet PC are configured with a predetermined distance;
• wherein when at least one of the exposed portions is pressed, the resilient supporting portion corresponding to the pressed exposed portion is deformed which causes the combined portion to correspondingly press against the touch panel;
• wherein when the second connecting portion of the auxiliary device is fixed onto the tablet PC and adjusted at the collapsed position, the foldable body, the second connecting portion, and the auxiliary keyboard are collapsibly configured to cover the touch panel of the tablet PC.