Silicone-filled casing for use with light-emitting unit and method of manufacturing the light-emitting unit

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.