A replaceable key structure includes a key holder and a circuit board. The key holder is disposed above a circuit board. The key holder is formed with a mounting slot for selectively receiving a first key module or a second key module therein. A magnetic sensor and a contact connector are disposed on the circuit board positionally corresponding to the mounting slot of the key holder. The first key module has a shaft, and a magnetic element disposed on the bottom of the shaft. The magnetic sensor can output an analog signal when the magnetic element approaches. The second key module has a trigger switch which has two electrical terminals disposed on the bottom surface of the second key module. When the second key module is installed in the mounting slot, the electrical terminals can be electrically connected to the contact connector.

A mechanical keyboard includes printed circuit boards (PCBs), each having a pin holder; and a hole; mechanical switches to removably engage with the printed circuit boards, each of the mechanical switches having a body; a pin extending from the body to engage with the pin holder; a pillar extending from the body to engage with the hole; and a compressible switch extending upward from the body and associated with the pillar; a plurality of keys to engage with the compressible switch of the mechanical switches; the plurality of mechanical switches are to be removed from the PCBs by hand.

A replaceable key structure includes a key holder and a circuit board. The key holder is disposed above a circuit board. The key holder is formed with a mounting slot for selectively receiving a first key module or a second key module therein. A magnetic sensor and a contact connector are disposed on the circuit board positionally corresponding to the mounting slot of the key holder. The first key module has a shaft, and a magnetic element disposed on the bottom of the shaft. The magnetic sensor can output an analog signal when the magnetic element approaches. The second key module has a trigger switch which has two electrical terminals disposed on the bottom surface of the second key module. When the second key module is installed in the mounting slot, the electrical terminals can be electrically connected to the contact connector.

The present invention discloses a portable electronic apparatus, which includes a cover casing, a base casing, a first keyboard and a second keyboard. The base casing is pivoted to the cover casing. The base casing includes a keyboard containing portion and a first connecting portion, and the first connecting portion is disposed on the keyboard containing portion. The first keyboard and the second keyboard are disposed in the keyboard containing portion interchangeably, the first keyboard has a second connecting portion, and the second keyboard has a third connecting portion. When the first keyboard is disposed in the keyboard containing portion, the second connecting portion is electrically connected to the first connecting portion. When the second keyboard is disposed in the keyboard containing portion, the third connecting portion is electrically connected to the first connecting portion.

A key input device includes: keys each including a contact portion provided on its back surface; a holder holding the keys movably; a conductive member opposed to the holder; and a circuit board having a switch surface and switches arranged on the switch surface and each contactable with the contact portion of a corresponding key. The conductive member is interposed between the switch surface and the holder. The holder has first through holes, and the conductive member has second through holes. At least one of the contact portion and the switch is inserted in a corresponding one of the first through holes, and at least one of the contact portion and the switch is inserted in a corresponding one of the second through holes.

In a keyboard according to an embodiment, a first end of a baseplate extends along a first direction. A second end of the baseplate extends along the first direction and is positioned opposite to the first end. A first cutout is disposed at the first end. A second cutout is disposed at the second end. The second cutout is aligned with the first cutout in a second direction with a partial offset in the first direction. The second direction intersects the first direction. A cover covers the baseplate. A third end of the cover extends along the first direction and is aligned with the first end in a third direction. The third direction intersects the first direction and the second direction. A fourth end of the cover extends along the first direction and is aligned with the second end in the third direction. The third end and the fourth end include the first hooks. A part of the first hook is positioned within the first cutout or the second cutout.