Current Labeling of Agricultural Machinery and its Legibility on Usage Environment

Abstract

In this study, a total of 804 labels on agricultural machinery were investigated. Some labels were difficult to read because of a combination of small print and low contrast between the characters and their background. The legibility of the label characters due to color combination, illuminance level, and user’s age was investigated. 58 samples of labels were used. The illuminance level was set at 3 stages. The subjects were 42 people aged 20 to 80. Minimum legible character size was 6 to 11 point at the “medium” and “high” illuminance level, and 11 to 19 point at the “low”. Minimum legible size for people under 60 was 6 to 16 point, and over 60 was 6 to 23 point.