| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter holder which unfailingly prevents backlash of a filter in a radial direction and a thickness direction during attachment and easily handles multiple filters.SOLUTION: A filter holder 6 holds a discoid filter F which is disposed so as to cover a front surface opening part of a reflector 5 for reflecting light emitted from a planar light source to the forward side. The filter holder 6 includes: a cylindrical part 6a stored in a glass holder 7; and multiple annular protruding parts 6d which are provided protruding from an inner peripheral surface S1 of the cylindrical part 6a. The cylindrical part 6a and the multiple annular protruding parts 6d are integrally formed by an elastic member such as silicone rubber. An annular recessed part G1 which holds an outer edge part of the filter F is formed between each pair of adjacent annular protruding parts 6d from among the multiple annular protruding parts 6d. |
