Fill-port assembly with reflowed seal member

1. An apparatus comprising:

a fill port body extending through an opening in a substrate and comprising a central bore communicating between a first side and a second side of the substrate;

a first seal member;

a compression member which threadingly engages the central bore to compress the first seal member and seal against passage of a low density gas through the central bore; and

a second seal member formed of a material adapted to, when melted, flow within the central bore to permanently seal against the passage of said low density gas therethrough.

2. The apparatus of claim 1 , wherein the compression member is characterized as a bolt with a threaded portion which engages a threaded portion of the central bore and a head portion which compresses the first seal member against a shoulder surface of the central bore.

3. The apparatus of claim 2 , wherein the head portion is adapted for engagement by a driver tool to threadingly advance the compression member into the central bore.

4. The apparatus of claim 1 , wherein the first seal member is characterized as a metal washer.

5. The apparatus of claim 1 , further comprising a joint seal disposed to seal a junction between the fill port body and the substrate.

6. The apparatus of claim 1 , in which the first seal member is characterized as an annular seal member.

7. The apparatus of claim 1 , in which the second seal member is characterized as a solder pre-form adapted to reflow within the central bore.

8. The apparatus of claim 1 , wherein the fill port body is inserted through the opening of the substrate in a first axial direction, and wherein the compression member is inserted into the central bore in a second axial direction opposite the first axial direction.

9. The apparatus of claim 1 , wherein the substrate forms a portion of a hermetically sealed housing and the fill port body is configured to facilitate filling of the housing with the low density gas.

10. The apparatus of claim 9 , wherein the housing is characterized as a housing of a data storage device in which a storage medium is disposed.

11. An apparatus comprising:

a fill port body comprising a first body portion configured to extend through a substrate opening, a second body portion configured to extend adjacent a first side of the substrate, and a central bore extending through the first and second body portions;

a first seal member;

a compression member configured to threadingly engage the central bore to compress the first seal member and seal against passage of a low density gas through the central bore; and

a second seal member comprising a reflowed material which permanently seals the central bore.

12. The apparatus of claim 11 , wherein the compression member is characterized as a bolt with a threaded portion which engages a threaded portion of the central bore and a head portion which compresses the first seal member against a shoulder surface of the central bore.

13. The apparatus of claim 12 , wherein the head portion is engaged by a driver tool to threadingly advance the compression member into the central bore.

14. The apparatus of claim 11 , wherein the first seal member is characterized as a metal washer.

15. The apparatus of claim 11 , in which the second sealing member comprises solder which is melted to form a solder joint that adheres to the compression member and a recessed surface of the central bore.

16. The apparatus of claim 11 , wherein the compression member is plated with a layer of metal to enhance adherence of the reflowed second sealing member thereto.

17. The apparatus of claim 11 , in combination with a hermetically sealed housing so that the fill port body is configured to facilitate filling of the housing with the low density gas.

18. The apparatus of claim 11 , in which the second sealing member is placed onto a head portion of the compression member and melted to form a hardened connection joint that seals the central bore against said passage of the low density gas.

19. An apparatus comprising:

a compression member which threadingly engages a central bore of a fill port and compresses a first seal member to seal the central bore against a flow of a low density gas therethrough; and

a second seal member comprising a reflowable material which is melted to form a connection joint in contacting engagement with the compression member to permanently seal the central bore against said flow.

20. The apparatus of claim 19 , in which the second seal member comprises solder which is reflowed within the central bore to establish the connection joint.