Patent ID: 7187495

Claim:
A method of manufacturing a screen member for a transmission screen, the method comprising the steps of: preparing a lens substrate having a light incident face and a light emission face opposite to the light incident face, the light incident face of the lens substrate being formed with a plurality of lens portions for condensing incident light; forming a light shielding layer from a first layer on the light emission face of the lens substrate so that the light shielding layer has a plurality of openings on light paths of the light that has been transmitted by the lens portions of the lens substrate; and forming a plurality of light diffusion portions for diffusing the light that has been transmitted by each lens portion of the lens substrate; wherein the light shielding layer forming step includes: forming the first layer on the light emission face of the lens substrate by applying a material including a positive photopolymer onto the light emission face of the lens substrate; exposing the first layer by allowing light to enter the lens substrate from the light incident face thereof so that the light is condensed by each of the lens portions and then the first layer is irradiated by the condensed light; and developing the first layer so that portions of the first layer that have been exposed by the condensed light are removed to thereby form the plurality of openings, and wherein the light diffusion portions forming step includes: forming a second layer on the light shielding layer by applying a material including a negative photopolymer onto the light shielding layer; exposing the second layer by allowing light to enter the lens substrate from the light incident face thereof so that the light is condensed by each of the lens portions and then the second layer is irradiated by the condensed light; and developing the second layer so that portions of the second layer that have been exposed by the condensed light remain as the plurality of light diffusion portions.