Vehicle glass window with electrical connector soldered by lead-free solder

1. A vehicle window glass, comprising:

a glass substrate;

an electrically conductive layer forming a conductive pattern over the glass substrate;

a lead-free solder layer on the conductive layer; and

a metal plate element on the solder layer, the metal plate element comprising an iron alloy,

wherein the solder layer has a thickness ranging from 0.1 mm to 0.3 mm, and the metal plate element has a thickness ranging from 0.52 mm to 0.65 mm.

2. The vehicle window glass according to claim 1 , wherein the solder layer is made of a tin-based metal alloy comprising silver.

3. The vehicle window glass according to claim , wherein the metal plate element is comprised in an electrical connector for connecting the electrically conductive layer to electric wiring.

4. The vehicle window glass according to claim 3 , wherein the electrical connector comprises first and second said metal plate elements and a bridge portion connecting the first and second metal plate elements.

5. The vehicle window glass according to claim 4 , wherein the first and second metal plate elements and the bridge portion are formed integrally from a single piece of metal plate material.

6. The vehicle window glass according to claim 1 , wherein the thickness of the metal plate element is from 0.54 mm to 0.6 mm.

7. The vehicle window glass according to claim 1 , wherein the iron alloy of the metal plate element is selected from an iron-nickel alloy and an iron-nickel-cobalt alloy.

8. The vehicle window glass according to claim 1 , wherein the iron alloy of the metal plate element comprises 48% nickel.

9. The vehicle window glass according to claim 1 , wherein a surface of the metal plate element facing the solder layer is flat.

10. The vehicle window glass according to claim 1 , wherein the metal plate element is coated with one or more metals selected from Ni, Cu and Ag.

11. The vehicle window glass according to claim 10 , wherein the metal plate element is coated with a Ni layer of 2 μm-5 μm thickness on the metal plate element, a Cu layer of 2 μm-5 μm thickness on the Ni layer, and an Ag layer of 5 μm-8 μm thickness on the Cu layer.

12. The vehicle window glass according to claim 1 , further comprising a colored sintered ceramic bind layer between the glass substrate and the conductive layer.

13. A vehicle window glass, comprising:

a glass substrate:

an electrically conductive layer forming a conductive pattern over the glass substrate;

a ceramic band layer between the electrically conductive layer and the glass substrate;

a lead-free solder layer on the conductive layer; and

an electrical connector connected to the conductive layer by the lead-free solder layer, the electrical connector comprising a metal plate element contacting the solder layer, the metal plate element comprising an iron alloy selected from an iron-nickel alloy and an iron-nickel-cobalt alloy,

wherein the solder layer has a thickness ranging from 0.1 mm to 0.3 mm, and the metal plate element has a thickness ranging from 0.52 mm to 0.65 mm.

14. A vehicle window glass, comprising:

a glass substrate;

an electrically conductive layer forming a conductive pattern over the glass substrate;

a lead-free solder layer on the conductive layer; and

an electrical connector for connecting the electrically conductive layer to electric wiring, the electrical connector comprising first and second metal plate elements each contacting said lead-free solder layer and a bridge portion connecting the first and second metal plate elements, said metal plate elements and the bridge portion being formed integrally from a single piece of metal plate material which is an iron alloy,

wherein the solder layer has a thickness ranging from 0.1 mm to 0.3 mm, and each metal plate element has a thickness ranging from 0.52 mm to 0.65 mm.

15. The vehicle window glass according to claim 14 , wherein the thickness of each of said metal plate elements is from 0.54 mm to 0.60 mm.

16. The vehicle window glass according to claim 14 , wherein the electrical connector is made of an iron alloy.

17. A vehicle window glass, comprising:

a glass substrate;

a sintered ceramic band layer on the glass substrate;

an electrically conductive layer forming a conductive pattern over the glass substrate, the conductive pattern including a pair of busbars that are on the ceramic band layer, wherein the pair of busbars are configured to connect to a plurality of conductive wires of the electrically conductive layer;

an electrical connector comprising at least first and second metal plate elements and a bridge portion connecting the plate elements, the electrical connector being connected to the busbar of the electrically conductive layer; and

respective lead-free solder layers contacting directly between the first and second metal plate elements and at least one of the pair of busbars of the conductive layer,

said metal plate elements and the bridge portion being formed integrally with one another and comprising an iron alloy, and wherein the surfaces of the metal plate elements facing the respective solder layers are flat, being free of protrusions, indentations, bends and angles,

wherein each solder layer has a thickness ranging from 0.1 mm to 0.3 mm, and each metal plate element has a thickness ranging from 0.52 mm to 0.65 mm.

18. A vehicle window glass, comprising:

a glass substrate that is made of soda-lima silicate glass;

an electrically conductive layer forming a conductive pattern over the glass substrate;

a lead-free solder layer on the electrically conductive layer, wherein the solder layer comprises Sn-Ag based solder; and

a metal plate element on the solder layer, the metal plate element comprising an iron alloy, wherein the iron alloy comprises 48% nickel, wherein a surface of the metal plate element facing the solder layer is flat,

wherein the solder layer has a thickness ranging from 0.1 mm to 0.3 mm, and the metal plate element has a thickness ranging from 0.52 mm to 0.65 mm.