| Summary: | 碩士 === 大同大學 === 工業設計研究所 === 90 === Abstract
Keyboard is the important common input device accompanying with computers. However, many researches have proved that the traditional QWERTY keyboard not only affects work performance but also caused damages on users’ hands, wrists, and shoulders. That is the reason why many alternative keyboards have been developed. In recent years, the concept and validity of Chord Keyboard have been adopted and verified by many researches.
The aim of this research is to design an ergonomic chord keyboard with Han spelling input. Four main experiments were conducted : 1. Learning curve of Han spelling, 2. Single/double handed chord coding, 3. Anthropometry , and 4. Comparision experiment. The results showed, after an average of 90 minute learning the input rate and the accuracy using the new designed keyboard are not significantly different from those using the QWERTY keyboard. However, there was an obvious improvement on the ergonomic aspect. From Static Photographic measurements, ulnar deviation angle of 00 and dorsi flexion angle of 1.660 are all lower than the QWERTY keyboard’s angle of 200; and from 2-D angle measurements, ulnar deviation angle of 1.450 is lower than the QWERTY keyboard’s angle of 18.950. Besides, by using Han Spelling, only 31 sets of Chord Codes are required to memorize, compared to 42 sets when using Phonetic Symbols, which lowers the memory load. Adopting the Chord concept has the following advantages: (1) Increases the compatibility of computer equipments by having the mouse and single-handed Chord Keyboard together, (2) provides personal operation preferences as the keyboard can freely segregate and adjust.
Regard to typing, the ergonomic chord keyboard with Han spelling input developed in this researches no significant difference from the QWERT keyboard. However in the aspect of ergonomics, it reduces the elements harmful to hands and wrists while increasing work effectiveness. The result of this experiment not only provides useful references for keyboard designers, it also broadens the ability to simultaneously enter in Chinese and English. Thus it meets the international and practical needs.
Keywords: Ulnar deviation, Dorsi flexion, Chord keyboard, Han Spelling, Learning curve
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