Manufacturing method of rod lens array

Abstract

The invention provides a method for manufacturing rod shaped lens array with multiple array strucutre efficiently. The invention also provides a method for manufacturing rod shaped lens array with multilevel strucutre, thereby ensuring more than three rows of rod shaped lens arrays can be overlapped and equipped between a first substrate and a second substrate, which is characterized in that the thickness of adhesive coated between the rod shaped lens array and the rod shaped lens array is less than the thickness of the adhesive coated between the substrate and the rod shaped lens array.

Description

technical field [0001] The present invention relates to a method for manufacturing a rod lens array, and more specifically, to a rod lens with a multi-stage arrangement structure in which a rod lens array composed of a plurality of rod lenses arranged in parallel is stacked and arranged between two substrates. Fabrication method of the array. Background technique [0002] As one type of microlens, there is known a cylindrical plastic rod lens in which both end surfaces are polished to mirror surfaces. Such a plastic rod lens is used as a single rod lens or as a rod lens array in which a plurality of rod lenses are arranged in parallel between two substrates. Such rod lens arrays are used as optical components for image sensors used in copiers, facsimiles, scanners, hand-held scanners, etc., or as LED printers using LEDs (light-emitting diodes) as light sources, liquid crystal printers using liquid crystal elements, and EL printers. Component writing devices used in EL prin...

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Problems solved by technology

[0012] However, in the method of Patent Document 1, the filling of the adhesive becomes insufficient due to the fine gaps between the rod lenses, or the yield decreases at the place where adhesion failure occurs, or the filling of the adhesive takes a long time. Time and other issues

[0013] In addition, the method of Patent Document 2 is suitable for the manufacture of rod lens arrays with a two-stage arrangement structure, but it is not suitable for the manufacture of rod lens arrays with three or more stages of arrangement.

[0014] Furthermore, in the method of Patent Document 3, it is difficult to accurately align the positions of the two rod lens arrays, and if the two rod lens arrays are not properly aligned, the lens will be damaged if the two rod lens arrays are pressed. Problems such as adverse effects on the lens due to heat and pressure

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