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EP0484073A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Lenticular lens sheet

Assignee: Kuraray Co Ltd
•
Filing: 1991-10-28
•
Granted: —
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Expires: 2011-10-28
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Abstract

Abstract A double-sided lenticular lens sheet has an entrance lens layer (1) and an exit lens layer (2), at least said exit lens layer containing light-diffusing fine particles, and has parameters satisfying the following expressions (I) and (II). t₁ > t₂ > 0 0 ≦ Δn₁c₁ ρ₁d₁ < Δn₂c₂ ρ₂d₂ wherein t₁ represents a thickness of the entrance lens layer; t₂, a thickness of the exit lens layer; Δn₁, a difference in refractive index between the thermoplastic resin and the light-diffusing fine particles in the entrance lens layer; Δn₂, a difference in refractive index between the thermoplastic resin and the light-diffusing fine particles in the exit lens layer; c₁, a weight concentration of the light-diffusing fine particles in the entrance lens layer; c₂, a weight concentration of the light-diffusing fine particles in the exit lens layer; ρ₁, a gravity of the light-diffusing fine particles in the entrance lens layer; ρ₂, a gravity of the light-diffusing fine particles in the exit lens layer; d₁, an average particle diameter of the light-diffusing fine particles in the entrance lens layer; and d₂, an average particle diameter of the light-diffusing fine particles in the exit lens layer. The lenticular lens sheet of the present invention can be used in transmission-type projection screens. It can be stably manufactured even when its pitch is made very small, and yet can ensure a sufficient visual field angle, and also can improve the transmission efficiency of light to obtain a bright picture.

Inventors

  • 👤 Ichiro Matsuzaki
  • 👤 Hiroshi Kuwada
  • 👤 Masao Otaki
  • 👤 Ken Abe

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-24 09:51
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00278; B29D11/00288; G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 238 words
A double-sided lenticular lens sheet comprising an entrance lens layer having an entrance lens, and an exit lens layer having an exit lens whose lens surface is formed at the light convergent point of the entrance lens, or in the vicinity thereof, wherein; said entrance lens layer and said exit lens layer are each formed of a substantially transparent thermoplastic resin; at least said exit lens layer contains light-diffusing fine particles; and said lens sheet has parameters satisfying the following expressions (I) and (II). t₁ > t₂ > 0 0 ≦ Δn₁c₁ ρ₁d₁ < Δn₂c₂ ρ₂d₂ wherein t₁ represents a thickness of the entrance lens layer; t₂, a thickness of the exit lens layer; Δn₁, adifference in refractive index between the thermoplastic resin and the light-diffusing fine particles in the entrance lens layer; Δn₂, a difference in refractive index between the thermoplastic resin and the light-diffusing fine particles in the exit lens layer; c₁, a weight concentration of the light-diffusing fine particles in the entrance lens layer; c₂, a weight concentration of the light-diffusing fine particles in the exit lens layer; ρ₁, a gravity of the light-diffusing fine particles in the entrance lens layer; ρ₂, a gravity of the light-diffusing fine particles in the exit lens layer; d₁, an average particle diameter of the light-diffusing fine particles in the entrance lens layer; and d₂, an average particle diameter of the light-diffusing fine particles in the exit lens layer.
Claim 2
Dependent Claim 25 words
The lenticular lens sheet according to Claim 1, wherein the thickness t₂ of the exit lens layer is 40 µm < t₂ < 500 µm.
Claim 3
Dependent Claim 31 words
The lenticular lens sheet according to Claim 1 or 2, wherein said lens sheet satisfies the following expression. 0 ≦ ( Δn₁c₁ ρ₁d₁ ) / ( Δn₂c₂ ρ₂d₂ ) < 0.5
Claim 4
Dependent Claim 38 words
The lenticular lens sheet according to Claim 1 or 2, wherein said lens sheet satisfies the following expressions. 0.01 ≦ Δn₁ ≦ 0.12 0 ≦ c₁ ≦ 3 % by weight 4 µm ≦ d₁ ≦ 30 µm
Claim 5
Dependent Claim 36 words
The lenticular lens sheet according to Claim 1 or 2, wherein said lens sheet satisfies the following expression. 0.01 ≦ Δn₂ ≦ 0.12 3 % by weight ≦ c₂ 4 µm ≦ d₂ ≦ 30 µm
Claim 6
Dependent Claim 76 words
The lenticular lens sheet according to Claim 1 or 2, wherein said entrance lens has, over the whole width thereof, a shape that makes the light convergent point substantially single in the vicinity of the surface of the exit lens and satisfies the following expression (III). Z(x) = Cx² 1 + {1 - (K + 1)C² x²} 1/2 wherein C is a main curvature, K is a conic constant, and - 0.8 ≦ K ≦ 0.
Claim 7
Dependent Claim 38 words
The lenticular lens sheet according to Claim 1 or 2, wherein said exit lens layer is formed in such a manner that its thickness at the center of each exit lens becomes smaller with approach to the periphery.
Claim 8
Dependent Claim 53 words
The lenticular lens sheet according to Claim 1, wherein said lenticular lens sheet is formed by co-extruding a first resin sheet that gives said entrance lens layer and a second resin sheet that gives said exit lens layer, and passing them through a pair of engraved rolls provided with given convexes and concaves.
Claim 9
Independent Claim 46 words
A method of producing a lenticular lens sheet, comprising co-extruding a first resin sheet that gives an entrance lens layer and a second resin sheet that gives an exit lens layer, and passing them through a pair of engraved rolls provided with given convexes and concaves.

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