Claims
- 1. A refractive index distribution type optical element having a core/cladding structure produced with an ion exchange method, said a refractive index distribution type optical element including colorant of metal oxides in cladding glass thereof,
- wherein said cladding glass consisting of base glass and said colorant of the metal oxides comprises:
- 0.3 to 4.0 wt. % CoO;
- 1.0 to 12.0 wt. % Fe.sub.2 O.sub.3 ;
- 0.0 to 2.0 wt. % NiO; and
- 0.0 to 0.2 wt. % Cr.sub.2 O.sub.3
- when the total amount of the base glass except for the colorants is taken as 100 wt. %.
- 2. A refractive index distribution type optical element as claimed in claim 1, wherein the cladding glass including the colorant of the metal oxides comprises:
- 0.5 to 1.5 wt. % CoO;
- 1.5 to 4.0 wt. % Fe.sub.2 O.sub.3 ; and
- 0 wt. % NiO;
- when the total amount of the base glass except for the colorants is taken as 100 wt. %.
- 3. A refractive index distribution type optical element as claimed in claim 1, wherein the cladding glass including the colorant of the metal oxides comprises:
- 0.5 to 1.5 wt. % CoO;
- 1.0 to 2.5 wt. % Fe.sub.2 O.sub.3 ; and
- 0.2 to 2.0 wt. % NiO;
- when the total amount of the base glass except for the colorants is taken as 100 wt. %.
- 4. A refractive index distribution type optical element as claimed in claim 2, wherein the base glass includes equal to or more than 5 wt. % MgO when the total amount of the base glass is taken as 100 wt. %.
- 5. A refractive index distribution type optical element as claimed in claim 1, wherein the cladding glass including the colorant of the metal oxide comprises:
- 0.5 to 1.5 wt. % CoO;
- 6.0 to 12.0 wt. % Fe.sub.2 O.sub.3 ; and
- 0 wt. % NiO;
- when the total amount of the base glass except for the colorants is taken as 100 wt. %.
- 6. A refractive index distribution type optical element as claimed in claim 1, wherein the cladding glass including the colorant of the metal oxide comprises:
- 0.5 to 1.5 wt. % CoO;
- 5.0 to 8.0 wt. % Fe.sub.2 O.sub.3 ; and
- 0.2 to 2.0 wt. % NiO;
- when the total amount of the base glass except for the colorants is taken as 100 wt. %.
- 7. A refractive index distribution type optical element as claimed in claim 5, wherein the base glass includes less than 5 wt. % MgO when the total amount of the base glass is taken as 100 wt. %.
- 8. A refractive index distribution type optical element as claimed in claim 1, wherein the cladding glass comprises the base glass, on average, comprising:
- 0.5 to 12 wt. % Li.sub.2 O;
- 14 to 28 wt. % Na.sub.2 O wherein the total amount of Li.sub.2 O and Na.sub.2 O is in a range of 15 to 29 wt. %;
- 2.5 to 15 wt. % MgO;
- 2to 10 wt. % BaO;
- 0 to 25 wt. % PbO;
- 2 to 10 wt. % TiO.sub.2 ; and
- 45 to 60 wt. % SiO.sub.2,
- and the glass constituting the core, on the average, comprising:
- 2 to 9 wt. % Li.sub.2 O;
- 0.5 to 25 wt. % Na.sub.2 O wherein the total amount of Li.sub.2 O and Na.sub.2 O is in a range of 4 to 29 wt. %;
- 2.5 to 15 wt. % MgO;
- 2 to 10 wt. % BaO;
- 0 to 25 wt. % PbO;
- 2 to 10 wt. % TiO.sub.2 ; and
- 45 to 60 wt. % SiO.sub.2,
- wherein the content of Na.sub.2 O in the cladding glass is larger than that in the glass constituting the core and the content of Li.sub.2 O in the glass constituting the core is larger than that in the cladding glass.
- 9. A refractive index distribution type optical element as claimed in claim 1, wherein the cladding glass thereof has a thickness in a range of 1 to 100 .mu.m, and which having a thickness of 100 .mu.m exhibits the transmittance of equal to or less than 75% in relation to the whole lights having wave lengths in a range of 380 to 680 nm.
- 10. A refractive index distribution type optical element as claimed in claim 1, wherein the glass of the core thereof has a diameter in a range of 100 to 1000 .mu.m and the cladding glass thereof has a thickness in a range of 1 to 25% in relation to the diameter of the glass of the core.
- 11. A refractive index distribution type rod lens array being composed of plural refractive index distribution type optical elements as claimed in claim 1, wherein the plural pieces of the optical elements are arranged in such a manner that all optic axes thereof are mutually parallel, and said elements are adhered to each other.
Priority Claims (2)
Number |
Date |
Country |
Kind |
10-202113 |
Jul 1998 |
JPX |
|
11-070757 |
Mar 1999 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATION
This is a continuation application of PCT/JP99/03748 filed on Jul. 12, 1999.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4971423 |
Nakata et al. |
Nov 1990 |
|
5387433 |
Balian et al. |
Feb 1995 |
|
5818644 |
Noda |
Oct 1998 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
63-301901 |
Dec 1988 |
JPX |
10-139472 |
May 1998 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCTJP9903748 |
Jul 1999 |
|