US 12,134,241 B2
Method for producing light control panel used in optical image forming device
Makoto Otsubo, Hiroshima (JP)
Assigned to ASUKANET COMPANY, LTD., Hiroshima (JP)
Appl. No. 17/909,778
Filed by Asukanet Company, Ltd., Hiroshima (JP)
PCT Filed Mar. 3, 2021, PCT No. PCT/JP2021/008217
§ 371(c)(1), (2) Date Sep. 7, 2022,
PCT Pub. No. WO2021/182246, PCT Pub. Date Sep. 16, 2021.
Claims priority of application No. 2020-040936 (JP), filed on Mar. 10, 2020.
Prior Publication US 2023/0113203 A1, Apr. 13, 2023
Int. Cl. B29D 11/00 (2006.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 37/12 (2006.01); B32B 37/14 (2006.01); B32B 38/00 (2006.01); G02B 5/08 (2006.01); G02B 17/00 (2006.01); G02B 30/35 (2020.01)
CPC B29D 11/00596 (2013.01) [B29D 11/0073 (2013.01); B32B 7/12 (2013.01); B32B 27/08 (2013.01); B32B 37/12 (2013.01); B32B 37/14 (2013.01); B32B 38/0004 (2013.01); B32B 2307/412 (2013.01); B32B 2307/416 (2013.01); G02B 5/08 (2013.01); G02B 17/006 (2013.01); G02B 30/35 (2020.01); Y10T 156/1052 (2015.01)] 12 Claims
OG exemplary drawing
 
1. A method for producing a light control panel used in an optical image forming device, the light control panel having a number of light-reflecting layers arranged in parallel so as to be perpendicular to front and back surfaces of the light control panel, the optical image forming device being formed by disposing two of the light control panels to be superposed on each other so that the light-reflecting layers of the respective light control panels are orthogonal to each other in a plan view, the method for producing a light control panel comprising:
a laminate formation step of forming a laminate by laminating a plurality of transparent plate materials having a same thickness and consisting of glass or a hard resin with a high melting point while alternately shifting the transparent plate materials by a predetermined length in a width direction so as to form protruding portions;
a light-reflecting layer formation step of forming the light-reflecting layers at least on facing surfaces of the protruding portions adjacent to each other;
a resin filling step of filling gap regions between the protruding portions adjacent to each other with a transparent resin;
a cutting step of making a plurality of preforms for the light control panels by cutting the protruding portions having been integrated by being filled with the transparent resin at each of both sides of the laminate off and separating the integrated protruding portions from a laminated body; and
a flattening step of flattening both end surfaces of each of the preforms in a width direction so as to produce the light control panels,
wherein a ratio between refractive indexes of the transparent plate materials and the transparent resin is 0.9 to 1.1.