Patent application number | Description | Published |
20110215488 | LENS FORMING METAL MOLD, LENS FORMING METHOD AND PICKUP DEVICE - A metal mold including: a first inner metal mold which forms a first lens surface and a first flat surface portion of a lens; a first outer metal mold which forms a second flat surface portion; a second inner metal mold which forms a second lens surface and a third flat surface portion; and a second outer metal mold which forms a fourth flat surface portion, and wherein a first protruded portion which forms a first concaved portion on the lens is formed all around an outer periphery of the first inner metal mold, the first concaved portion serving as clearance for a burr, and a second protruded portion which forms a second concaved portion on the lens is formed all around an outer periphery of the second inner metal mold, the second concaved portion serving as clearance for a burr. | 09-08-2011 |
20110215489 | LENS FORMING METAL MOLD, LENS FORMING METHOD, LENS, AND PICKUP DEVICE - A lens forming metal mold comprising: a first metal mold portion that forms a first lens surface of a lens; and a second metal mold portion that forms a second lens surface of the lens. An air vent groove is formed on at least one contacting surface of a contacting surface of the first metal mold portion contacting with the second metal mold portion and a contacting surface of the second metal mold portion contacting with the first metal mold portion. A convex surface serving to form a concaved portion on the lens for accommodating a burr caused by the air vent groove is formed at least around the air vent groove on an outer circumference forming surface of the at least one contacting surface on which the air vent groove is formed, the outer circumference forming surface serving to from a tubular surface of the lens. | 09-08-2011 |
20150116850 | LENS AND OPTICAL PICKUP DEVICE - A metal mold including: a first inner metal mold which forms a first lens surface and a first flat surface portion of a lens; a first outer metal mold which forms a second flat surface portion; a second inner metal mold which forms a second lens surface and a third flat surface portion; and a second outer metal mold which forms a fourth flat surface portion, and wherein a first protruded portion which forms a first concaved portion on the lens is formed all around an outer periphery of the first inner metal mold, the first concaved portion serving as clearance for a burr, and a second protruded portion which forms a second concaved portion on the lens is formed all around an outer periphery of the second inner metal mold, the second concaved portion serving as clearance for a burr. | 04-30-2015 |