My primary pointing device is currently an extra-large
[Perfit optical USB mouse].|
The left button on this mouse has been modified, using two Saia-Burgess low force microswitches (part # G3M1T1PUL).
The activation force on these switches is 12 cN - one quarter that of the microswitch it replaces.
I discuss the properties of this switch in considerable detail on my page about microswitches.
The nut on the top of the actuator acts as a simple pressure diffuser.
During operation the index finger rests on the switch casing to the right of this button - and it rolls to the left to press the switch.
A second switch allows for operation with the thumb.
The original left button is held in the up position by a screw inserted into its hinge. This screw is visible in the photos.
I have previously performed microswitch surgery on a number of my earlier mice, usually inserting lever microswitches. However, this is the first time I have used external microswitches.
To provide variety, I also use a 3M Renassiance optical mouse.
This mouse has an unusual design - and looks more like a joystick than a mouse.
The mouse's main features are:
The main idea behind the design appears to be a sensible one.
There are a few problems - in particular:
The second problem is also a bit of an issue for me.
The mice pictured above both lift the forearm off the work surface.
The idea is to allow the mouse to be controlled by muscles far away from the hand - on the grounds that these muscles are less prone to over-use injury.
There is a price for doing this - mouse accuracty and sensitivity is reduced, and the shoulder and upper arm are stressed more. However mouse-related forearm stress does appear to be reduced by this approach.
I also use this mouse, which I operate with my left hand. It is not a terribly satisfactory device.
Button activation forcesI've measured the average activation force for a number of my mice: