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blank keys to replace the normal individual keys around the area. The top surface of a
blank key is at the ground level of the key stroke for other keys (ref. Fig. 3-7). The
blank key will not be pressed down when pressed. The user may order for accessional
quantity of the blank keys as option for his/her application.
There are also double key and quad key available for the user to configure the
programmable keyboard such that the most frequently used keys may occupy larger
areas. The double key occupies two “vertically” adjacent positions and uses only the
bottom position for key content (ref. Fig. 3-3). The quad key occupies a two by two
matrical area and uses only the lower right position for key content (ref. Fig. 3-4).
An example of using the above mentioned alternate key tops is shown in Fig.
3-7.
Fig. 3 - 2 Fig. 3 - 3 Fig. 3 - 4
Fig. 3 - 5 Fig. 3 - 6
Springy wall
protuberance