Patent ID: 7253444

Claim:
A casing, for use with light-emitting unit, that covers over a substrate with light emitting elements mounted thereon, the casing constituted by a first member and a second member which fixedly hold the substrate therebetween and which are approximately dish-shaped and are joined together in a mutually engaged manner such that a hollow area in which the substrate is disposed is formed therebetween, wherein said second member has a projecting piece inserted to said first member and inside the projecting piece there is formed a passage that penetrates from near a top thereof to a bottom thereof so as to communicate the hollow area with the outside of the casing, wherein at a position where the passage is connected to the outside of the casing there is formed an injection opening to inject fluid material to the hollow area via the passage, wherein in the vicinity of the injection opening there is provided a discharge opening to discharge the injected fluid material from the hollow area, wherein, in a state where said second member and said first member are being joined together and mutually engaged therewith, the hollow area is divided into a first-member side space and a second-member side space with the substrate as a boundary therebetween, and a tip of the projecting piece is disposed in the first-member side space whereas the discharge opening is disposed near the second-member side space, and wherein the hollow area is formed in a shape such that the fluid material injected from the injection opening flows from the first-member side space through the second-member side so as to be discharged from the discharge opening.