| 摘要 |
All the lights that enter at an angle over the angle that permits a rate of reflection light to drastically increase on an entrance plane of a diffusing plate (3) (maximum incidence angle Thetamax=70° are reflected on a reflecting plane (21) and enter the diffusing plate (3). Thus, a pseudo light source is formed by the lights gathered in the vicinity of a coupling section of the reflecting plane (21) among the lights emitted by a discharge lamp (1). Luminance nonuniformity can be reduced by increasing luminance between the adjacent discharge lamps (1). Furthermore, since the discharge lamp (1) can be stored on an inner side of the reflecting plane (21) having a paraboloidal cross-sectional shape, thickness increase in a front-rear direction can be suppressed compared with conventional examples, by shortening a distance between a reflecting plate (2) and the diffusing plate (3).
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