Patent ID: 7683980

Claim:
An optical element enclosure comprising: one, two, or more film-shaped or sheet-shaped optical elements; a plate-shaped supporting member supporting said one, two, or more optical elements; and a contractive enclosing member enclosing said one, two, or more optical elements and said supporting member, wherein said one, two, or more optical elements and said supporting member form a laminate body, said laminate body has an incident plane in which light from a light source enters, an emitting plane from which the light entered from said incident plane is emitted, and an edge surface locating between said incident plane and said emitting plane, said enclosing member is closely adhered to said laminate body and encloses the emitting plane, incident plane, and all edge surfaces of said laminate body, at least one opening portion is provided for said enclosing member, wherein the opening portion of said enclosing member is provided for a corner/curvature portion of said supporting member, and a thickness t of said supporting member, a length L of side of said supporting member, and a tension F of said enclosing member satisfy the following relational expression (1) under an environment of a temperature of 70° C., 0≦ F ≦1.65×10 4 ×t/L (1) (where, in the expression (1), t, L, and F indicate the following elements: t: distance between the incident plane and the emitting plane of the supporting member L: length of side closed by said enclosing member among the sides constructing a plane perpendicular to the thickness t F: tension of the enclosing member which acts on the side of the length L in the parallel direction).