Patent ID: 7275931

Claim:
A medical irradiation apparatus comprising: a main body; a luminous body comprised of a light emitting element provided in a light outlet of said main body; an annular reflective member with an annular reflective surface provided at the circumference of said luminous body, said reflect surface reflecting the light from said luminous body forward; and a lens member provided so as to cover a forward opening of said reflective member, said lens member refracting and transmitting the direct light from said luminous body and the light reflected from said reflective member, whereby almost all the outgoing light from said lens member is emitted so as to direct into a specified irradiation area, and wherein said specified irradiation area is defined substantially as a cylindrical area around an optical axis of outgoing light where the distribution of illumination intensity is substantially uniform in a field area of each irradiation field orthogonal to the optical axis and the illumination intensity is substantially the same in said cylindrical irradiation area; said lens member is comprised of a lens which is rotationally symmetrical around its center axis; a light entering side of said lens is formed convex and a light emitting side of said lens is formed convex or substantially flat; said lens member has a light entering side which is composed of a curved surface at a center and continuous inclined surfaces therearound; and said curved surface is spherical with a small curvature radius, whereas said inclined surface is substantially linear in a section including a central axis of said lens member.