Method for producing surface convexes and concaves

Details Method for producing surface convexes and concaves Method for producing surface convexes and concaves

2006-09-28

2010-12-07

Gupta, Yogendra N (Department: 1744)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

C264S001360

Reexamination Certificate

active

07846356

ABSTRACT:
A method for producing surface convexes and concaves enabling easy and highly precise formation of desired convex and concave shapes using a photomask is provided.A mask member having light transmitting sections and non-light transmitting sections is disposed over one side of a photosensitive film consisting of a photosensitive resin composition with an interval with respect to the photosensitive film, light is irradiated from a light source disposed on the side of the mask member to subject the photosensitive film to light exposure through the light transmitting sections of the mask member, and exposed portions or unexposed portions of the photosensitive film are removed by development to produce convexes and concaves on the photosensitive film in shapes determined by shapes of the exposed portions or unexposed portions. In the light exposure, light exposure conditions such as distance L between the light source and the mask member, size D of the light source and optical distance T between the mask member and the photosensitive film are controlled so as to control the shapes of the exposed portions or unexposed portions.

REFERENCES:
patent: 5298366 (1994-03-01), Iwasaki et al.
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patent: 2004-280017 (2004-10-01), None
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patent: 2006-003519 (2006-01-01), None
patent: WO/2004/021052 (2004-03-01), None
Exposure Equipment of Ushio Inc., Optical Technology Information Magazine “Light edge” (with partial translation), No. 23, issued Nov. 2001, http//www.ushio.co.jp/documents/technology/lightedge 23/ushio le23-04.pdf.

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