Patent ID: 6069740
Filing Date: 2000-05-30
Classification: G02B,G02F

Abstract:
A planar microlens array comprised of an array of microlenses made of a synthetic resin having a high refractive index and formed on a surface of one of a base glass plate and a cover glass plate and an adhesive layer made of a synthetic resin having a low refractive index provided between the array of microlenses and the base glass plate and the cover glass plate,wherein the equations (Eqs. 1-5) are satisfied, where n.sub.1 represents the refractive index of said synthetic resin having a high refractive index, n.sub.2 represents the refractive index of said synthetic resin having a low refractive index, t.sub.1 represents a thickness of a thickest portion of a sphere portion of said microlenses, t.sub.2 represents a thickness of a rest portion of said microlenses and t.sub.3 represents a thickness of a thinnest portion of said adhesive layer.1.59.ltoreq.n.sub.1 .ltoreq.1.68 (Eq. 1)1.38.ltoreq.n.sub.2 .ltoreq.1.42 (Eq. 2)5.ltoreq.t.sub.1 .ltoreq.30 (.mu.m) (Eq. 3)t.sub.2 .ltoreq.6 (.mu.m) (Eq. 4)t.sub.3 .gtoreq.0.2 t.sub.1 (.mu.m) (Eq. 5)