Image forming apparatus, optical scanning device, and plastic lens and mould

• Main Authors: HAYASHI EIICHI, IWAMATSU AKIHIRO, TAKAHASHI GO, AOKI KAN
• Format: Patent
• Language: Chinese; English
• Published: 25.04.2012
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The invention provides a plastic lens used for casting in a mould of a casting plastic lens. The mould used on the casting plastic lens comprises the components as follows: a pair of first casting moulds: the pair of first casting moulds are deployed for reproducing a light-incident surface and a light-emitting surface; a pair of second casting moulds: the pair of second casting moulds are arranged at the two ends of the first casting moulds and are parallel to and faces to the optical axis direction, each deployment of the second casting moulds is used for reproducing a non-light penetratingsurface, and at least one of the second casting moulds comprises a vent-hole which is described as an elongated slit equal to or longer than the length of light in the effective range and is elongated in the main scanning direction of the light-incident surface and the light-emitting surface along a line in a same distance away from the light-incident surface and the light-emitting surface; the air is sprayed out from the