Radwin R G, Jeng O J
Department of Industrial Engineering, University of Wisconsin-Madison 53706, USA.
Hum Factors. 1997 Mar;39(1):130-40. doi: 10.1518/001872097778940605.
Key switch design parameters, including make force, make travel, and over travel, were investigated for minimizing operator-exerted force while maximizing key-tapping speed. A mechanical apparatus was designed, constructed, and used for independently controlling key switch parameters and for directly measuring finger exertions during repetitive key tapping using strain gauge load cells. The task for the 25 participants involved using the index finger of the dominant hand to repeatedly depress a single key as rapidly as possible. Participants received visual and auditory feedback upon a successful keystroke. Peak force exerted decreased 24% and key-tapping rate increased 2% when over travel was distended from 0.0 to 3.0 mm. Although peak force exerted was not significantly affected by make point travel, key-tapping rate increased 2% when make point travel was reduced from 4.0 to 1.0 mm. These results indicate that key switch mechanisms that provide adequate over travel might enable operators to exert less force during repetitive key tapping without inhibiting performance.
研究了包括接通力、接通行程和超行程在内的按键开关设计参数，以在最大化按键敲击速度的同时最小化操作员施加的力。设计、构建了一种机械设备，用于独立控制按键开关参数，并在使用应变片式称重传感器进行重复按键敲击时直接测量手指用力情况。25名参与者的任务是用优势手的食指尽可能快地反复按下一个键。成功按键时，参与者会收到视觉和听觉反馈。当超行程从0.0毫米扩展到3.0毫米时，施加的峰值力降低了24%，按键敲击速率提高了2%。尽管施加的峰值力不受接通点行程的显著影响，但当接通点行程从4.0毫米减小到1.0毫米时，按键敲击速率提高了2%。这些结果表明，提供足够超行程的按键开关机制可能使操作员在重复按键敲击时施加较小的力，而不会影响操作性能。
