CONVERGING FILTER AND METHOD OF PRODUCING SAME.

摘要

The colour filter or a monochromatic filter (4) used by being pasted on a pickup element (1), has on a transparent substrate (3) at least two resin layers (A), (B) of different refractive indexes which are in contact with each other, an interface at which these resin layers (A), (B) are in contact with each other being formed in a curved state so that the incident light (7) is condensed on each light-receiving portion (2). Accordingly, even when this filter is used in a pasted type solid pickup apparatus, the condensation effect is obtained, and the sensitivity of the apparatus can be improved. The methods of forming an interface, at which the two resin layers (A), (B) are in contact with each other, arcuately so that the interface has a condensation effect include a method of selectively exposing and hardening a photosetting resin so as to form a required curved portion on the surface thereof, and a method of initially forming a projection-carrying stepped element, and then applying a resin to the upper surface of this element under selected application conditions so as to obtain a required convex surface on the projection-carrying stepped element. @(31pp Dwg.No.1/10)@.