| 摘要 |
A direct-light illuminating unit has a case on which a reflector, lamps and a diffuser are configured in order. The diffuser has a transparent substrate, onto which, either side of the surfaces may have predetermined optical patterns being formed into a specific profile. The optical pattern is composed of a plurality of optical transform units. The specific surface profile redistributes the incident light and resulted in an averaged emitting light across the illuminating area. The surface profile is formed according to a predetermined surface function and the parameters of the function include the relative positions of the optical components of the illuminating unit and given constrains. The optical transform units on the surface have predetermined depths, widths and arrangement pattern that alter the onward direction and strength of incident rays and result in redistributed emitting light across the illuminating area with uniform luminosity.
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