Koito Manufacturing Company, Ltd.

Hirokazu Yanagihara

Shiro Takezawa

Norihiro Nishitani

Shirou Takezawa

Satoshi Ogawa

Masamitsu Wada

Masakazu Yamashita

A vehicle lamp having a resin lens includes: an elongated lens body including a flat portion large in radius of curvature and a curved portion small in radius of curvature with respect to the longitudinal direction of the lens body; and a peripheral flange formed along the peripheral of the lens body, wherein the curve portion is smaller in wall thickness than the flat portion.

Vehicle-lamp

A synthetic resin layered lens for a vehicle lighting device in which an upper lens layer is disposed on a lower lens layer thereby forming a layered lens of integral construction. The lower lens layer is molded in a state that the surface of the lower lens layer where it contacts the upper lens layer, faces the injection gate. The gate scar of the lower layer is thus hidden by the upper layer.

Apparatus for making a synthetic resin layered lens for a vehicle

A vehicular lamp which includes a lamp body having a front opening, a lens coupled to the front opening of the lamp body, a light source disposed within a lamp chamber defined by the lamp body and the lens, and convex and concave fish-eye lens steps arranged in a line direction thereof, wherein because step portions are formed at a boundary of the convex and concave lens steps and the convex lens steps and the concave lens steps are arranged to shift by half a pitch in a column direction thereof, optical images created by the convex and concave lens steps are focused on different points from each other in the front-rear direction of the lens or the lamp, to create an impression of the deep, three dimensional lamp inside.

Lens structure for lamps

Method of molding a synthetic resin layered lens for a vehicle headlight

A method for molding a lamp body of vehicular lamps formed of synthetic resin which includes steps of forming a lamp body by synthetic resin which is provided with an air communication hole, a surrounding wall formed at a position where the air communication hole is surrounded thereby, and a cover member for covering a rear portion of the air communication hole, forming a recess on one surface of the surrounding wall to provide a thin hinge section to form the cover member integrally with the lamp body, bending down the cover member at the recess while facing outside to thereby define a communication passage connecting to the air communication hole cooperatively with the surrounding wall, providing a mold core for molding the cover member to extend in the core sliding direction, which mold core is constituted by a first block positioning at the side of the cover member where the recess is formed and a second block positioning at the opposite side thereof, retracting first, when the lamp body is retracted from the mold after the injection-molding process, the second block positioning at the side of the cover member where the recess is not formed, and then retracting the first block positioning at the side of the cover member where the recess is formed while bending the cover member at the hinge section.

Method for molding lamp body automotive lamps and lamp body thereof

Synthetic resin layered lens for a vehicle lighting device, method of

A resin-molded automotive lens, and a method for producing same, in which sink marks are prevented from being formed in a thin lens surface portion of the lens. In a resin-molded lens having a thin lens surface portion and a thick portion such as a seal leg portion or boss portions formed integrally with at least a part of this lens surface portion, the lens surface portion and the thick portion are formed in separate injections. That is, the thick portion is molded with resin integrally with another lens surface portion in advance, and thereafter the thin lens surface portion is molded with resin integrally with this thick portion, so that in this portion it is possible to reduce the influence of cooling of the resin when the lens surface portion is molded to thereby prevent sink marks from being formed in the lens surface portion.

Resin-molded lens having no sink marks and process for producing same

A vehicular lamp in which a peripheral part of an air ventilation hole provided on a slope or the curved surface of a lamp body formed of resin is formed on a flat plane perpendicular to the moving direction of the movable mold for the lamp body, and the peripheral part of the air ventilation hole is constructed concavely or projectingly from the inner surface of the lamp body.

Growing community of inventors

Shizuoka, Japan

Hirokazu Yanagihara