ISO 24550:2019 pdf download

ISO 24550:2019 pdf download

ISO 24550:2019 pdf download.Ergonomics — Accessible design — Indicator lights on consumer products
1 Scope
This document specifies design requirements and recommendations for indicator lights, mainly LED sourced, on consumer products for use by older people and people with visual disabilities. It does not consider the needs of persons who are blind. Indicator lights include those that inform users visually about the conditions, changes in functional status and settings, and malfunction of products. They convey information by light on/off, time- modulated intensity, blinking, colour, luminance level, and layout. This document addresses household and home appliances. It excludes electronic displays presenting characters and graphics, machinery, and appliances in special use for professional, technical, and industrial applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC Guide 71, Guide for addressing accessibility in standards
ISO 17049, Accessible design — Application of braille on signage, equipment and appliances
CIE S 017, ILV: International Lighting Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC Guide 71 and CIE S 017 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 consumer product
product that is intended to be acquired and used by an individual for personal rather than professional use
[SOURCE: ISO/TS 20282-2:2013, 4.3]
3.2 indicator light
light which is associated with the operation of a product and is indicative of the operation of a product
Note 1 to entry: Indicator light informs users about the conditions, changes in functional statuses and settings,or malfunction of products.
Note 2 to entry: Indicator light conveys information by light on/off, time-modulated intensity, blinking, colour,luminance level, and layout.
3.3 small indicator
light indicator light emitting area that is smaller than 20’ in diameter of the visual angle Note 1 to entry: Visual angle of 20’ corresponds to 3 mm length viewed at a 50 cm distance. Note 2 to entry: Visual appearance of small indicator light smaller than 20’ of visual angle changes in brightness and colour. According to the spatial summation of vision, brightness of a light smaller than 20’ of visual angle changes proportionally with its size. Brightness of a light larger than 20’ of visual angle is determined by luminance only. Colour for a smaller visual field than 20’ also changes its appearance described small-field tritanopia, a kind of colour defect.