| 摘要 |
An illumination device includes: a light source section including a laser light source, and allowing a laser light beam emitted from the laser light source to be outputted intermittently at a predetermined frequency; an optical element through which the laser light beam passes; and a driver section changing a coherency of the laser light beam by driving the optical element at a predetermined drive frequency. Expressions (1) |2×f2−n1×f1|≧20 or (2) |2×f2−n2×f1|≦̸3, (3) f2≧20 or (4) f2≦̸3, and (5) |f2−n1×f1|≧20 or (6) |f2−n3×f1|≦̸3 are satisfied, where f1 denotes the frequency in Hz, f2 denotes a variation frequency of luminance in illumination light outputted from the optical element in Hz, the variation frequency being generated by the driving of the optical element, n1 denotes an arbitrary integer of 0 to 10 both inclusive, and n2 and n3 denote respective predetermined integers of 0 to 10 both inclusive.
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