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Microlens sheet and manufacturing method thereof

A technology of microlens arrays and lenses, applied in lenses, instruments, stereography, etc., can solve the problem of not necessarily thickness reproducibility, and achieve the effects of good reproducibility, excellent scratch resistance and dust resistance

Inactive Publication Date: 2013-07-10
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adjustment of the thickness of the microlens array is easily affected by the process conditions, and it may not be easy to achieve the reproducibility of the thickness

Method used

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  • Microlens sheet and manufacturing method thereof
  • Microlens sheet and manufacturing method thereof
  • Microlens sheet and manufacturing method thereof

Examples

Experimental program
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example

[0134] Working examples of the present invention are described below, but of course, the scope of the present invention is not limited to these examples.

[0135] Fabrication of the microlens array layer

[0136] First, a sheet-shaped first structure body having a depressed pattern was produced by replicating air bubbles by the following procedure. As a master mold, a laminated sheet having a two-layer structure in which copper foil with a thickness of 20 μm was laminated on a polyimide layer with a thickness of 25 μm (trade name: TWO LAYER COPPER CLAD SUBSTRATE) , manufactured by Japan Interconnection Systems, Ltd.). The polyimide layer of the laminated sheet was treated with a laser to generate holes (processed by Tosei Electrobeam Co., Ltd.) in a region with a side length of 100 mm, thereby imparting a Matrix pattern of conical depressions. Fig. 6(a) is a partial cross-sectional view showing the obtained base mold, and Fig. 6(b) is a partial top view of the obtained ba...

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Abstract

A microlens sheet that can be used as a floating image material is provided having a microlens array layer that can be produced by a more simple replication process, without requiring adjustment of the thickness. The microlens sheet has high scratch resistance and dust resistance. The microlens sheet has a microlens array layer including a first surface, and a second surface formed by replication, having a plurality of arranged convex lenses and one or more partition walls with a fixed height (Hw) that protrudes past the top of the convex lenses, a radiation sensitive layer which is disposed substantially at a focal position of the convex lenses on a side of the microlens array layer opposite the first surface, and which is substantially parallel to the second surface.

Description

technical field [0001] The invention relates to a microlens sheet capable of providing three-dimensional composite images and a manufacturing method thereof. Background technique [0002] Products using holographic sheets or lenticular sheets are known materials that allow the viewer to see three-dimensional composite images. Among others, the lenticular sheeting disclosed in PCT International Publication No. WO 2001 / 63341 provides a composite image that appears to the observer's naked eye to float above or below the lenticular sheeting. These floating images, called "floating images," change as the viewer's perspective and distance change. Additionally, unlike standard holographic sheets, imaging lenticular sheets are difficult to manufacture by replication. [0003] A typical lenticular sheet for forming a floating image includes a microlens layer with either a radiation sensitive layer adjacent thereto, or a reflective layer corresponding to the radiation sensitive laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/22
CPCG02B3/0031G02B3/0075G03B35/24G02B30/56G02B3/005
Inventor 服部二郎增田祥一芥川智思木下康宏
Owner 3M INNOVATIVE PROPERTIES CO
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