Fluorescent substance, fluorescent composition, fluorescent mark carrier and optical reader thereof
First Claim
1. A fluorescent mark carrier comprising a fluorescent ink deposit formed thereon, said fluorescent ink deposit containing a fluorescent substance capable of emitting a fluorescent light of a wavelength different from that of the exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, wherein the fluorescent substance is comprised of an organic metallic compound, and wherein the fluorescent substance contains Nd and Yb, the molar ratio of Nd relative to Yb (Nd:
- Yb) being within the range of 9;
1 to 5;
5.
1 Assignment
0 Petitions
Accused Products
Abstract
A fluorescent substance of the following general formula:
Ln.sub.X A.sub.1-X PO.sub.4
wherein Ln represents at least one element selected from the group consisting of Nd, Yb and Er; A represents at least one element selected from the group consisting of Y, La, Gd, Bi, Ce, Lu, In and Tb; and X represents a value within the range of 0.01 to 0.99.
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Citations
11 Claims
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1. A fluorescent mark carrier comprising a fluorescent ink deposit formed thereon, said fluorescent ink deposit containing a fluorescent substance capable of emitting a fluorescent light of a wavelength different from that of the exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, wherein the fluorescent substance is comprised of an organic metallic compound, and wherein the fluorescent substance contains Nd and Yb, the molar ratio of Nd relative to Yb (Nd:
- Yb) being within the range of 9;
1 to 5;
5. - View Dependent Claims (7, 8, 9, 10, 11)
- Yb) being within the range of 9;
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2. A fluorescent mark carrier comprising a fluorescent ink deposit formed thereon, said fluorescent ink deposit containing a fluorescent substance capable of emitting a fluorescent light of a wavelength different from that of the exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the exciting light, wherein the fluorescent substance is comprised of an organic metallic compound, and wherein the fluorescent substance contains Nd and Yb, the molar ratio of Nd relative to Yb (Nd:
- Yb) being within the range of 9;
1 to 5;
5.
- Yb) being within the range of 9;
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3. A fluorescent mark carrier comprising a fluorescent ink deposit formed thereon, said fluorescent ink deposit containing a fluorescent substance capable of emitting a fluorescent light of a wavelength different from that of the exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, wherein the fluorescent substance is at least one member selected from neodymium cinnamate, a complex salt of cinnamic acid with neodymium and ytterbium, a complex salt of benzoic acid with neodymium and ytterbium, neodymium naphthoate, and a complex salt of naphthoeic acid with neodymium and ytterbium.
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4. A fluorescent mark carrier comprising a fluorescent ink deposit formed thereon, said fluorescent ink deposit containing a fluorescent substance capable of emitting a fluorescent light of a wavelength different from that of the exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the exciting light, wherein the fluorescent substance is at least one member selected from neodymium cinnamate, a complex salt of cinnamic acid with neodymium and ytterbium, a complex salt of benzoic acid with neodymium and ytterbium, neodymium naphthoate, and a complex salt of naphthoeic acid with neodymium and ytterbium.
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5. A fluorescent mark carrier comprising a fluorescent ink deposit formed thereon, said fluorescent ink deposit containing a fluorescent substance capable of emitting a fluorescent light of a wavelength different from that of the exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, wherein the fluorescent substance comprises Fe and Er, both as an optical active element, and, other than these optical active elements, at least one element selected from the group consisting of Sc, Ga, Al, In, Y, Bi, Ce, Gd, Lu and La.
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6. A fluorescent mark carrier comprising a fluorescent ink deposit formed thereon, said fluorescent ink deposit containing a fluorescent substance capable of emitting a fluorescent light of a wavelength different from that of the exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the exciting light, wherein the fluorescent substance comprises Fe and Er, both as an optical active element, and, other than these optical active elements, at least one element selected from the group consisting of Sc, Ga, Al, In, Y, Bi, Ce, Gd, Lu and La.
Specification