Optical device and electronic device

Abstract

An optical device according to an embodiment of the present invention is an optical device including a lens structure in which a lens portion is injection molded integrally with a skirt portion extending from the edge of the lens portion, and a housing that supports this lens structure. The skirt portion has a molding gate receiving portion corresponding to a molding gate for injection molding, and the thickness of the edge G01C 3 / 02 H01L 31 / 12 G02B 3 / 02 4 10 2 2007 / 7 / 11 101109631 2008 / 1 / 23 000000000 Sharp KK Japan Mizuo Kazuhiro Kawanishi Shinya gejing pengjiu yun 11105 Japan 2006 / 7 / 21 199704 / 06

Description

technical field [0001] The present invention relates to an optical device and an electronic device that hold an injection-molded lens structure with a frame. [0002] This application claims priority based on Japanese Patent Application No. 2006-199704 filed in Japan on July 21, 2006. The entire contents thereof are hereby incorporated into this application. Background technique [0003] Conventionally, a method of producing a lens by injection molding such as a transfer method has been proposed. When forming a lens by such a manufacturing method, in order to realize high performance, sufficient cooling time is required in the molding process. In addition, examples of applications of optical devices using such lenses include infrared distance measuring sensors, reflective infrared sensors, or a combination of a plurality of such sensors. [0004] For example, what is described in (Japanese) Unexamined-Japanese-Patent No. 2000-79629 is known as a conventional injection com...

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Problems solved by technology

[0009] However, in the conventional synthetic resin injection-molded lens production method, when it is desired to produce a lens with a small curvature and a large area, the joint portion (that is, the edge) between the lens end and the side edge around the lens Becomes very thin, which hinders the fluidity of the molding resin injected from the molding gate when it flows to the lens body through the side edge

[0010] As a result of hindering the fluidity of the molding resin, there is no pressure on the mold space for molding the lens, and the lens is dented, unfilled, etc., and there is a problem that high-precision lens molding cannot be performed.

As a countermeasure, it is conceivable to reduce the lens area and increase the thickness of the bonding part, but when the lens area is reduced, the aperture ratio of the lens (lens diameter / focal length) decreases, and there is a problem that the performance of the optical device as a finished product decreases.

[0011] In addition, in the case of forming a large-area lens, as the lens becomes larger, it becomes difficult to design a positioning structure for fixing the positional relationship between the lens, the light-emitting element, and the light-receiving element, and there is a problem of manufacturing high-quality optical devices. The problem that the operability of assembly is lowered

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