Canon Kabushiki Kaisha

Cannon Kabushiki Kaisha

Hisakazu Morinaga

Toshinori Ando

Hiroshi Nakanishi

Norihisa Saito

Maki Saito

Hiroaki Yamagata

Shoichi Shimura

Kazutaka Takeuchi

A simulation system predicts a behavior of a molten resin in a mold in filling, packing, and cooling processes by using a fundamental equation formulated by the finite element method, and shrinkage factors in a direction of thickness and planar directions based on anisotropy of a volume shrinkage factor obtained during prediction of the filling, packing, and cooling processes, so that a warp deformation in an injection-molded article can be predicted at a higher precision. In this simulation system, the warp deformation is predicted by calculating the shrinkage factors in accordance with:

Method and apparatus for predicting deformation amount in

It is an object of this invention to provide an optical element molding method capable of correcting local processing errors in an optical element without increasing the size of an apparatus or raising the manufacturing cost. To achieve this object, an optical element molding method includes the first step of setting molding conditions before molding of said optical element, such that a constant shape error is stably formed on an optical function surface of the optical element, the second step of dividing the optical function surface of the optical element to be molded under the molding conditions into a plurality of regions, and approximating the shape error by using a function so that the divided regions are continuous in the boundaries between the regions, the third step of processing the shape of the cavity surface of the optical insert member into a shape by which the constant shape error is canceled, on the basis of the function obtained in the second step, and the fourth step of molding the optical element by using the optical insert member processed in the third step.

Optical element, method of molding the same, and laser scanning optical

Injection molding apparatus for predicting deformation amount in

A plastic molded article has an external appearance of a coated article and is formed by injection molding using a mold with a surface shaped by forming machining marks in the form of recesses over the entire mold surface. The resulting plastic molded article has a center line average roughness of the surface shaped of the plastic molded article less than 0.5 .mu.m and one of either an average slope within the range of 1.0.about.10.0.degree. or an average peak-to-peak interval within the range of 5.0-30.0 .mu.m.

Plastic molded article with a finished surface appearance

It is an object of this invention to provide an optical element molding method capable of correcting local processing errors in an optical element without increasing the size of an apparatus or raising the manufacturing cost. To achieve this object, an optical element molding method includes the first step of setting molding conditions before molding of said optical element, such that a constant shape error is stably formed on an optical function surface of the optical element, the second step of dividing the optical function surface of the optical element to be molded under the molding conditions into a plurality of regions, and approximating the shape error by using a function so that the divided regions are continuous in the boundaries between the regions, the third step of processing the shape of the cavity surface of the optical-insert member into a shape by which the constant shape error is canceled, on the basis of the function obtained in the second step, and the fourth step of molding the optical element by using the optical insert member processed in the third step.

Growing community of inventors

Yamato, Japan

Hisakazu Morinaga