Patent ID: 7633598

Claim:
A filter used for an exposure apparatus that exposes a plate using a light from a light source, said filter comprising: a light transmitting film configured to transmit the light from the light source; a first member that includes plural first rod members, and thermally contacts said light transmitting film, the plural first rod members being rod members; and a second member that includes plural second rod members, and thermally contacts at least one of said light transmitting film or said first member, the plural second rod members being other rod members, wherein the plural second rod members partition an area in which the light is illuminated in said light transmitting film into plural areas, wherein the plural first rod members are provided in each of the plural areas partitioned by the plural second rod members, and wherein a heating value transmittable by the first rod member per unit time in a longitudinal direction of the first rod member is smaller than a heating value transmittable by the second rod member per unit time in a longitudinal direction of the second rod member.