Illumination device and illumination unit

An illumination device emitting light from a point-like light source via a light flux control member emitting light from said point-like light source,

• wherein said light flux control member has a lens portion which is located as to correspond to said point-like light source and provided with a back face directed to said point-like light source and a front face opposite to the back face, and a body portion mounting said lens portion detachably,
• said body portion being provided with a lens-portion-mounting-hole receiving and engaging with said lens portion,
• said lens portion being fixed to said body portion by rotation after said lens-portion-mounting-hole has engaged with said lens-portion,
• each of said tens portions includes a periphery-side circular portion, a back-face-side projection, a front-face-side projection,
• said back-face-side projection being formed on a back face side as to project radially outward beyond said periphery-side circular portion,
• said front-face-side projection being formed on a front face side as to project radially outward beyond said periphery-side circular portion and being differently located as compared with said back-face-side projection to a direction of said rotation,
• said lens-portion-mounting-hole being formed so as to be fit into said periphery-side circular portion of said lens portion in a relatively rotatable manner,
• said body portion having at least one of a first projection-receiving-hole enabling said front-face-side projection to move from a side of said back face to a said of said front face and a second projection-receiving-hole enabling said back-face-side projection to move from the side of said front face to a side of said back face,
• said body portion being sandwiched by said front-face-side projection and said back-face-side projection of said lens portion from sides of said front face and said back face at least at a periphery part of said lens-portion-mounting-hole, and
• when said lens portion is mounted to said body portion from a back side of said body portion, said lens portion is rotated with respect to said body portion so that said front-face-side projection is shifted with respect to said first projection-receiving-hole in a rotation direction to pinch-support said periphery-side circular portion of said lens-portion-mounting-hole of said body portion between said front-face-side projection and said back-face-side projection of said lens portion from front-and-back-sides, after said front-face-side projection of said lens portion and said first projection-receiving-hole of said body portion are aligned to each other and said periphery-side circular portion and said lens-portion-mounting-hole of said lens portion are aligned to each other, and further said lens portion has engaged with said body portion so that said front-face-side projection extrudes to a side of said front face of said body portion,
• alternatively when said lens portion is mounted to said body portion from a front side of said body portion, said lens portion is rotated with respect to said body portion so that said back-face-side projection is shifted with respect to said second projection-receiving-hole in a rotation direction to pinch-support said periphery-side circular portion of said lens-portion-mounting-hole of said body portion between said front-face-side projection and said back-face-side projection of said lens portion from front-and-back-sides, after said back-face-side projection of said lens portion and said second projection-receiving-hole of said body portion are aligned to each other and said periphery-side circular portion and said lens-portion-mounting-hole of said lens portion are aligned to each other, and further said lens portion has engaged with said body portion so that said back-face-side projection extrudes to a side of said back face of said body portion.

An illumination device emitting light from a point-like light source via a light flux control member emitting light from a point-like light source via a light flux control member,

• wherein said light flux control member has a lens portion which is located as to correspond to said point-like light source and provided a body portion mounting said lens portion detachably,
• said lens portion being provided with a top portion extruding sideways,
• said body portion being provided with a lens-portion-mounting-hole receiving said lens portion and allowing the lens portion to be rotated, a back-face-side projection projecting toward inside of said lens-portion-mounting-hole and located on a back face side of said body portion and a front-face-side projection projecting toward inside of said lens-portion-mounting-hole and located on a front face side of said body portion, and,
• a gap being formed between said back-face-side projection and said front-face-side projection as to receive said top portion of said lens portion and allow said top portion of said lens portion to be rotated,
• at least one of said back-face-side projection and said front-face-side projection being provided with a projection-receiving hole guiding said top portion of said lens portion to said gap,
• front and back sides of said top portion being supported from front and back directions by said front-face-side projection and said back-face-side projection through rotation of said lens portion with respect to said body portion for shifting said top portion of said lens portion with respect to said projection-receiving hole after said top portion of said lens portion has been guided into said gap by said projection-receiving hole.