Harada H, Katsuura T, Kikuchi Y
Department of Ergonomics, Faculty of Engineering, Chiba University, Japan.
J Hum Ergol (Tokyo). 1996 Dec;25(2):167-74.
The purpose of this study was to reveal the optimum size and inter-key spacing of numeric square keys for touch screens. Six male students (22-25 years old) and three female students (21-24 years old) volunteered as subjects for this experiment. Each subject took part in data entry tasks using numeric square keys of touch devices. The sizes of keys were 6, 12, 21, 30 and 39 mm and each the inter-key spacing was 0, 3, 6, 12 and 21 mm. Response times with key sizes of 6 and 12 mm were significantly slower than with key sizes of 21 and 30 mm (p < 0.001). Furthermore, the key size of 6 mm significantly caused more errors than the key sizes of 12, 21, 30 and 39 mm (p < 0.05). The response time with inter-key spacing of 3 mm was significantly faster than with that of 0, 6, 12 and 21 mm (p < 0.001). Inter-key spacing of 0 mm significantly produced more errors than other inter-key spacing. Subjective ratings for inter-key spacing of 3, 6 and 12 mm were significantly better than those of 0 and 21 mm (p < 0.05). These results suggested that the optimum size of numeric square keys for touch screens should be more than 21 mm and optimum inter-key spacing should be from 3 to 6 mm. Optimum key size, however, must be selected with regard to the limitation of screen size.
本研究的目的是揭示触摸屏数字方形按键的最佳尺寸和按键间距。六名男学生（22 - 25岁）和三名女学生（21 - 24岁）自愿作为本实验的受试者。每位受试者使用触摸设备的数字方形按键参与数据输入任务。按键尺寸为6、12、21、30和39毫米，每个按键间距为0、3、6、12和21毫米。按键尺寸为6毫米和12毫米时的响应时间明显比21毫米和30毫米时慢（p < 0.001）。此外，6毫米的按键尺寸比12、21、30和39毫米的按键尺寸明显导致更多错误（p < 0.05）。按键间距为3毫米时的响应时间明显比0、6、12和21毫米时快（p < 0.001）。按键间距为0毫米时明显比其他按键间距产生更多错误。按键间距为3、6和12毫米时的主观评分明显优于0和21毫米时（p < 0.05）。这些结果表明，触摸屏数字方形按键的最佳尺寸应大于21毫米，最佳按键间距应为3至6毫米。然而，必须根据屏幕尺寸的限制来选择最佳按键尺寸。
