Lens device

Abstract

In a lens device, plastic lenses having circular outer periphery are placed in a plastic lens-barrel having an octagonal or more complex polygonal inner surface in such a way that the outer peripheral surfaces of the lenses are press contacted to the inner surface of the polygonal shape. This lens device has press contact portions that are pressed by the lens outer peripheral surface and the lens-barrel inner surface in the vicinity and in both sides of gate traces where optical axis displacement is large so as to suppress the displacement of the gate trace by the press contact portions.

Description

technical field [0001] The present invention relates to a lens device in which a lens used in a camera or the like is inserted into a lens barrel and fixed. Background technique [0002] Cameras for digital cameras and mobile phones, etc., use a lens device in which one or more lenses are inserted into the lens barrel and fixed. Such a lens device is produced by inserting and fixing the lenses into the lens barrel so that the optical axes of the lens and the lens barrel and the optical axes between the plurality of lenses are coincident and aligned. [0003] On the other hand, in such a lens device, a plastic lens, a plastic lens barrel, etc. are used from the viewpoint of being easy to obtain an inexpensive product having an arbitrary shape. [0004] However, such a plastic lens or lens barrel is prone to expansion or contraction due to changes in temperature or humidity. When the lens is inserted into the lens barrel, fixed and assembled, even if the center is positioned,...

AI Technical Summary

Problems solved by technology

Nevertheless, there is still a problem that optical axis misalignment between the lens and the lens barrel and between the lenses cannot be sufficiently suppressed

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