Masayuki Muranaka

New Optical System For Projection TV With Very Short Projection Distance

The projection TV of high picture quality and short depth, has been developed, using the new optical system with short projection distance which has been realized by plastic and glass hybrid lens and aspherical phosphor screen.

Precise Aspherical Plastic Lens for Electronic Appliances — Molding Technology and Applications —

We have successfully developed precise and mass-productive molding processes for plastic lenses of home-use electronic appliances such as camcorder (video camera combined with portable VCR) and projection TV, These have already been applied to our plastic lens production. Tens of thousands of plastic lenses are being molded in every month at our works.

Precision Molding Of Aspherical Plastic Lens For Cam-Corder And Projection Tv

New molding processes have been successfully developed for precise aspherical lenses of cam-corder or projection TV. They are founded on our idea that precise aspherical lens can be molded by securing the molding deformation axial and constant in every shot. This paper presents a) computer simulation of thermal process and molding deformation, b) factors and process to secure the molding deformation constant i.e. repeatability of molded aspherical surface figure, c) molding dies and injection machine to realize temperature homogeneity of molding lens and stability of injected weight, and d) pre-correction of surface figure on optically polished insert to compensate surface deformation in the molding process. Additionally applications of the aspherical plastic lens manufactured industrially with new process are also provided.