Surface emission light source device and method of manufacturing light guide plate with reflecting plate therefor

A surface emission light source device comprising a light source, a light guide plate for guiding light from said light source and causing the light to emerge from a front surface thereof, and a reflecting plate, having an irregular-reflection surface formed of irregular corrugations and disposed on a lower surface of said light guide plate, to diffuse and reflect the light guided through said light guide plate with said irregular-reflection surface and to cause the diffused/reflected light to emerge from said front surface of said light guide plate,

• wherein said reflecting plate is bonded to said lower surface of said light guide plate through a cementing material having a refractive index substantially equal to that of said light guide plate, thereby bonding said irregular-reflection surface to said lower surface of said light guide plate.

A method of manufacturing a light guide plate with a reflecting plate, comprising the steps of:

• placing a reflecting plate having an irregular-reflection surface with a surface formed of irregular corrugations in a mold;
• and
• injecting a light guide plate-forming molten resin in said mold, thereby integrally forming a light guide plate on said irregular-reflection surface of said reflecting plate.

A method of manufacturing a light guide plate with a reflecting plate, comprising the steps of applying a cementing material to an irregular-reflection surface of a reflecting plate or a lower surface of a light guide plate, said irregular-reflection surface having a surface formed of irregular corrugations, and said cementing material having a refractive index substantially equal to that of said light guide plate, and bonding said reflecting plate to said light guide plate.