A neuromuscular stimulation device is described having a plastic casing housing a printed circuit board bearing control electronics, with the casing including an external integral flexible portion which is capable of being flexed into the interior of the casing so as to cause an electrically insulative substrate on which is carried an electrically conductive pathway to be pushed into contact with the PCB in order to complete an electrical circuit. Such a switch is relatively inexpensive to produce, as it has few moving parts, can be formed in a usual manufacturing process, and is robust.

A key switch includes a baseplate, a circuit layer, a keycap and a support rod. The baseplate has a hook and a first through hole neighboring to the hook. The circuit layer includes a first sublayer disposed above the baseplate and having a second through hole, and a second sublayer disposed above the first sublayer and having a third through hole; a portion of the second sublayer extends over the second through hole and forms a first resilient portion; the first resilient portion has four sides, two of which connect to the second sublayer; and the first resilient portion is neighboring to the hook. The keycap is disposed above the baseplate and can move upward and downward in respect to the baseplate. The support rod has a first portion and a second portion; the first portion movably connects to the keycap and the second portion engages the hook.

A membrane switch includes an upper electrode sheet that includes an upper electrode, a lower electrode sheet that includes a lower electrode facing the upper electrode, and an adhesive layer that joins the upper electrode sheet to the lower electrode sheet; and the upper and lower electrodes come into contact with each other due to a pressing force, which is applied to at least one of the upper electrode sheet and the lower electrode sheet, and conduct electricity. The upper electrode sheet includes: an upper base on which the upper electrode is formed; and an upper insulating layer that is provided between the upper base and the lower electrode sheet, includes a first opening at a position corresponding to the upper electrode, and is joined to the lower electrode sheet by the adhesive layer. The upper insulating layer is formed on the upper base.

A neuromuscular stimulation device is described having a plastic casing housing a printed circuit board bearing control electronics, with the casing including an external integral flexible portion which is capable of being flexed into the interior of the casing so as to cause an electrically insulative substrate on which is carried an electrically conductive pathway to be pushed into contact with the PCB in order to complete an electrical circuit. Such a switch is relatively inexpensive to produce, as it has few moving parts, can be formed in a usual manufacturing process, and is robust.

A key switch includes a baseplate, a circuit layer, a keycap and a support rod. The baseplate has a hook and a first through hole neighboring to the hook. The circuit layer includes a plurality of superimposed sublayers disposed above the baseplate and having a through hole structure passing through the sublayers; a portion of one of the sublayers extends in the through hole structure over the first through hole and forms a resilient portion neighboring to the hook. Two sides of the resilient portion connect to the circuit layer. The keycap is disposed above the baseplate and can move upward and downward in respect to the baseplate. The support rod has a first portion, movably connecting to the keycap, and a second portion, engaged with the hook. The resilient portion extends beneath and abuts against the second portion for buffering a collision between the second portion and the baseplate.

A key switch includes a baseplate, a circuit layer, a keycap and a support rod. The baseplate has a hook and a first through hole neighboring to the hook. The circuit layer includes a plurality of superimposed sublayers disposed above the baseplate and having a through hole structure passing through the sublayers; a portion of one of the sublayers extends in the through hole structure over the first through hole and forms a resilient portion neighboring to the hook. Two sides of the resilient portion connect to the circuit layer. The keycap is disposed above the baseplate and can move upward and downward in respect to the baseplate. The support rod has a first portion, movably connecting to the keycap, and a second portion, engaged with the hook. The resilient portion extends beneath and abuts against the second portion for buffering a collision between the second portion and the baseplate.

A key switch includes a baseplate, a circuit layer, a keycap and a support rod. The baseplate has a hook and a first through hole neighboring to the hook. The circuit layer includes a first sublayer disposed above the baseplate and having a second through hole, and a second sublayer disposed above the first sublayer and having a third through hole; a portion of the second sublayer extends over the second through hole and forms a first resilient portion; the first resilient portion has four sides, two of which connect to the second sublayer; and the first resilient portion is neighboring to the hook. The keycap is disposed above the baseplate and can move upward and downward in respect to the baseplate. The support rod has a first portion and a second portion; the first portion movably connects to the keycap and the second portion engages the hook.

A key switch includes a baseplate, a circuit layer, a keycap and a support rod. The baseplate has a hook and a first through hole neighboring to the hook. The circuit layer includes a first sublayer disposed above the baseplate and having a second through hole, and a second sublayer disposed above the first sublayer and having a third through hole; a portion of the second sublayer extends over the second through hole and forms a first resilient portion; the first resilient portion has four sides, two of which connect to the second sublayer; and the first resilient portion is neighboring to the hook. The keycap is disposed above the baseplate and can move upward and downward in respect to the baseplate. The support rod has a first portion and a second portion; the first portion movably connects to the keycap and the second portion engages the hook.