Difference between revisions of "Burroughs Opto-Electric"
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| lifetime = Unknown | | lifetime = Unknown | ||
| force graph name = BOE-ForceGraph.png | | force graph name = BOE-ForceGraph.png | ||
| − | | peak force = 35 | + | | peak force = 35 g, 60 g, 130 g |
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File:BOE-BlueKeycap-Legendable.jpg|Dirty blue legendable keycap, pad printed. | File:BOE-BlueKeycap-Legendable.jpg|Dirty blue legendable keycap, pad printed. | ||
File:BOE-Sliders-DirtyPlate.jpg|Single spring splider, view of torsion spring. Metal plate is both very dirty and heavily corroded. | File:BOE-Sliders-DirtyPlate.jpg|Single spring splider, view of torsion spring. Metal plate is both very dirty and heavily corroded. | ||
| − | File:BOE-DoubleSpringSlider.jpg|Double spring slider, approximately | + | File:BOE-DoubleSpringSlider.jpg|Double spring slider, approximately 130 g. |
File:BOE-Underside-Slider.jpg|Underside of sliders attached to metal plate. | File:BOE-Underside-Slider.jpg|Underside of sliders attached to metal plate. | ||
File:BOE-LED-Photoresistor.jpg|LED and photo resistor for each torsion spring slider. | File:BOE-LED-Photoresistor.jpg|LED and photo resistor for each torsion spring slider. | ||
| − | File:BOE-Keycap-profile.jpg|Clean keycaps, top row uses heavy switches, approximately | + | File:BOE-Keycap-profile.jpg|Clean keycaps, top row uses heavy switches, approximately 130 g. |
</gallery> | </gallery> | ||
Revision as of 23:36, 24 November 2013
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| Manufacturer | Burroughs |
|---|---|
| Inventor |
Craig C. Madsen Daniel B. Stewart James Andree |
| Switch type | Parabolic |
| Sense method | Opto-electric |
| Rated lifetime | Unknown |
| Peak force | 35 g, 60 g, 130 g |
History
Developed by Burroughs in the early 1980s as a "low profile", "tactile" and consistent switch using an opto-electric switching mechanism (note that it's not tactile in the modern sense). Besides being a rare opto-electric switch, this switch uses a horizontally disposed biasing spring which gives a very unique feel to the key actuation.
Only one keyboard is known to have been built with these switches for the Burroughs by Kokusai Electric: the BET-KB.
Exploded view of switch.
Dirty grey dye sublimation keycap, and underside of cap locks key.
Dirty blue legendable keycap, pad printed.
Single spring splider, view of torsion spring. Metal plate is both very dirty and heavily corroded.
Double spring slider, approximately 130 g.
Underside of sliders attached to metal plate.
LED and photo resistor for each torsion spring slider.
Clean keycaps, top row uses heavy switches, approximately 130 g.
Keyfeel
Very smooth slider, and very consistent spring. Since the opto-electric is contact-less, it plays no part in the keyfeel. The horizontally disposed biasing spring provides a very unique key feel, as the force to actuate actually decreases past a certain point in the key press.
Keycaps
All known keycaps are dye sublimated. Except for those with replaceable key-legends, which are pad printed.
Availability
Only one keyboard is known to have been made with these switches: the BET-KB
