Patent ID: 6858165

Claim:
A method of manufacturing a thin-plate article having at least one surface, with at least a part of the at least one surface of the thin-plate article being formed into a particular shape, by molding from a plastic material, said method comprising steps of: preparing a first molding die having a first molding die surface; preparing a pre-molding die which is capable of matching with said first molding die and forming a first volume of molding cavity in matching with said first molding die, and which has an injection port for injecting a plastic material into said molding cavity; and preparing a second molding die which is capable of matching with said first molding die and forming a second volume of molding cavity smaller than said first volume in matching with said first molding die, and which has a second molding die surface facing to said second volume of molding cavity; with matching said first molding die with said pre-molding die, injecting a molten plastic material from said injection port into said first volume of molding cavity formed between said first molding die and said pre-molding die; and after completion of said injecting step and before curing of said plastic material, releasing said first molding die from said pre-molding die and then matching said first molding die with said second molding die, wherein said plastic material injected in said injecting step is compressed in said second volume of molding cavity so as to mold the plastic material article between said first molding die and said second molding die.