Patent ID: 7485676

Claim:
A non-birefringent optical resin material containing a transparent polymer resin caked after flowing and a great number of inorganic fine particles dispersed in said polymer resin; wherein said inorganic fine particles have an orientation-birefringence by which that of the polymer resin is reinforced if major axis directions of the inorganic fine particles are parallel with an orientation direction of bonding chains of said polymer resin and is cancelled if major axis directions of the inorganic fine particles are perpendicular to the orientation direction of bonding chains of said polymer resin, and said bonding chains of said polymer resin orientated to an orientation direction corresponding to an external force acted in said flowing, and said great number of inorganic fine particles are orientated approximately perpendicular to said orientation direction of said bonding chains, thereby giving a non-birefringence to said optical resin material.