PURPOSE: To prevent intensity of illumination of a picture image from becoming ununiform, by providing one or more vertical partition plates on a reflector in the axial direction of a tubular light source, and reducing a variation of a relative illumination intensity distribution caused by a variation of a reflection factor of an original.
CONSTITUTION: One or more partition plates 24a, 24b are installed respectively or to either one of reflectors 22, 23 constituting a slit exposure illuminating device vertically to a reflection surface. In this case, the partition plate 24 is constituted so that it does not become an obstacle on the optical path from a part 9 to be illuminated to a projection lens 2. According to such a constitution, a variation of intensity of illumination due to a reflection factor (ρ) of the surface of an original is influenced by only a light emitting part of a light source 21, and becomes relatively small. Also, the intensity of illumination of a picture image can be made uniform by constituting the partition plate 24 of a semi- transparent material.
HORII SHIGERU
SHIGETA TERUAKI
NISHIYAMA HIDEO
| JPS54143226A | 1979-11-08 | |||
| JP54158518B |
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