Surface light source device

A surface light source device comprising:

• a plate-shaped optical member having an incidence surface and an emitting surface;
• a rod-shaped light source disposed near the incidence surface of said plate-shaped optical member;
• a plate-shaped optical block, separate from the plate-shaped optical member, disposed along the emitting surface of said plate-shaped optical member;
• a reflection member disposed about said rod-shaped light source, one end of said reflection member being pinched between said optical block and said plate-shaped optical member,
• said optical block having inner and outer sides with a directivity modifying surface provided on at least one of the inner and outer sides for modifying directivity of illumination light emitted from said emitting surface of said plate-shaped optical member,
• said directivity modifying surface including a repetition of inclined surfaces formed thereon, the inclined surfaces not being formed on said at least one side of the optical block in the vicinity of said incidence surface of said plate-shaped optical member.

A surface light source device comprising:

• a plate-shaped optical member having an incidence surface and an emitting surface;
• a rod-shaped light source disposed near the incidence surface of said plate-shaped optical member;
• a plate-shaped optical block, separate from the plate-shaped optical member, disposed along the emitting surface of said plate-shaped optical member and having inner and outer sides with a directivity modifying surface provided on at least one of the inner and outer sides for modifying directivity of illumination light emitted from said emitting surface of said plate-shaped optical member,
• said directivity modifying surface including a repetition of inclined surfaces formed thereon, the inclined surface not being formed on said at least one side of the optical block in the vicinity of said incidence surface of said plate-shaped optical member;
• and
• a holding mechanism which is constructed so as to enclose a part of at least one of said optical block and said plate-shaped optical member to hold said optical block and said plate-shaped optical member in cooperation with each other.

A surface light source device comprising:

• a plate-shaped optical member having an incidence surface and an emitting surface;
• a light source disposed near the incidence surface of said optical member;
• and
• a plate-shaped optical block, separate from the plate-shaped optical member, disposed along the emitting surface of said optical member, the optical block having inner and outer sides and a first end, the first end being positioned in the vicinity of the incidence surface of the optical member and in the vicinity of the light source, a repetition of inclined surfaces being formed on at least one of the inner and outer sides of the optical block, the inclined surfaces not being formed on said at least one side of the optical block in the vicinity of the first end.

A surface light source device comprising:

• a plate-shaped optical member having an incidence surface and an emitting surface;
• a light source disposed near the incidence surface of said optical member;
• and
• a plate-shaped optical block, separate from the plate-shaped optical member,
• the optical block having inner and outer sides and a first end, the first end being positioned in the vicinity of the incidence surface of the optical member and in the vicinity of the light source,
• the inner surface being disposed along the emitting surface of said optical member,
• a repetition of inclined surfaces being formed on at least the inner side of the optical block, the inclined surfaces not being formed on said at least one side of the optical block in the vicinity of the first end.

A surface light source device comprising:

• a plate-shaped optical member having an incidence surface and an emitting surface;
• a light source disposed near the incidence surface of said optical member;
• and
• a plate-shaped optical block, separate from the plate-shaped optical member,
• the optical block having inner and outer sides and a first end, the first end being positioned in the vicinity of the incidence surface of the optical member and in the vicinity of the light source,
• the inner surface being disposed along the emitting surface of said optical member,
• the plate-shaped optical block having a thickness which increases with increasing distance from the incidence surface
• a repetition of inclined surfaces being formed on at least on of the inner and outer sides of the optical block, the inclined surfaces not being formed on said at least one side of the optical block in the vicinity of the first end.