Package for an optical device

1. A device comprising:

a package having a bottom and a side wall surrounding the bottom;

an element adhered to the bottom of the package;

an internal contact formed inside the package;

a resin encapsulation material with which a space between the package and the element is filled; and

a coating formed to cover an end surface of the internal contact near the element, and made of a material whose thermal expansion coefficient is greater than or equal to the thermal expansion coefficient of the package and less than the thermal expansion coefficient of the resin encapsulation material.

2. The device of claim 1 , wherein

the element is an optical element having an optical receiver portion, and

the device further comprises a transparent member formed to cover the optical receiver portion and adhered to the optical element.

3. The device of claim 1 , wherein

the resin encapsulation material provides light blocking.

4. The device of claim 1 , wherein

a part of the coating is located above the end surface of the internal contact near the element.

5. The device of claim 4 , wherein

another part of the coating is located below the end surface of the internal contact near the element.

6. The device of claim 1 , wherein

the coating is made of a same material as the package.

7. The device of claim 1 , wherein

the package is formed by stacking a plurality of insulative substrates.

8. The device of claim 1 , wherein

the package includes a plurality of insulative substrates and a resin material.

9. The device of claim 1 , wherein

the package is formed by molding.