1. A method for forming a package-on-package assembly, comprising:
providing an electrically insulating material between an upper surface of a bottom package and a lower surface of a top package, wherein the top package comprises one or more first terminals on the lower surface of the top package and the bottom package comprises one or more second terminals on the upper surface of the bottom package;
coupling the top package to the bottom package by aligning and coupling at least some of the first terminals to corresponding second terminals;
providing a force to the top package in a direction towards the bottom package while heating the packages and the electrically insulating material to a temperature of at least about 220\xb0 C., wherein the electrically insulating material cures during heating of the packages and the electrically insulating material at the temperature of at least about 220\xb0 C., and wherein the bottom package comprises partially encapsulating a die in an encapsulant on the upper surface thereof before the coupling the top package to the bottom package.
2. The method of claim 1, further comprising providing the electrically insulating material onto the upper surface of the bottom package.
3. The method of claim 1, further comprising heating the top package and the bottom package to a temperature of at least about 150\xb0 C. before coupling the packages.
4. The method of claim 1, wherein the electrically insulating material comprises non-conductive paste or underfill material.
5. The method of claim 1, wherein the top package and the bottom package are bonded with the electrically insulating material after the electrically insulating material cures.
6. The method of claim 1, wherein providing the force to the top package while heating substantially fills the space between the upper surface of the bottom package and the lower surface of the top package with electrically insulating material such that there are substantially no air gaps between the surfaces of the packages.
7. A method for forming a package-on-package assembly, comprising:
providing an electrically insulating material onto an upper surface of a first substrate, wherein the first substrate comprises a die at least partially encapsulated in an encapsulant on the upper surface of the first substrate and one or more first terminals on the upper surface of the first substrate;
coupling the first substrate to a second substrate with at least some of the first terminals aligned with and coupled to corresponding second terminals on a lower surface of the second substrate; and
applying a force bringing the first substrate and the second substrate together while heating the substrates and the electrically insulating material to a temperature of at least about 220\xb0 C., wherein the electrically insulating material cures while the substrates and the electrically insulating material are at the temperature of at least about 220\xb0 C.
8. The method of claim 7, further comprising:
coupling the die to the upper surface of the first substrate;
encapsulating the upper surface of the first substrate and at least part of the die in the encapsulant;
coupling one or more first terminals to the upper surface of the first substrate; and
coupling one or more second terminals to the lower surface of a second substrate.
9. The method of claim 7, further comprising pre-heating the first substrate and the second substrate to a temperature of at least about 150\xb0 C.
10. The method of claim 7, wherein the electrically insulating material comprises non-conductive paste or underfill material.
11. The method of claim 7, wherein providing the force while heating substantially fills the space between the upper surface of the first substrate and the lower surface of the second substrate with electrically insulating material such that there are substantially no air gaps between the upper surface and the lower surface.
12. The method of claim 7, further comprising bonding the first substrate to the second substrate with the electrically insulating material.
13. The method of claim 7, wherein the die comprises a processor die.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A neutron generator tube for borehole logging use having substantially monoenergetic neutron flux on the generator surface, comprising:
a) an ion source to provide a source of hydrogen isotope ions,
b) means to store and control the pressure of hydrogen isotope atoms, associated with said ion source,
c) a target assembly including a target for producing neutron bombardment by said hydrogen isotope ions,
d) an ion accelerating gap with an ion travel directing lens defined by two or more axially spaced electrodes selectively connected to one of said ion source and said target assembly, the gap located axially between the electrodes and the target spaced axially from the electrodes, and
e) a high voltage insulator associated with said ion source and said target assembly, but everywhere spaced from the ion source,
f) said insulator having hollow conical shape tapering toward an insulator annular end,
g) there being a ring extending in coaxial relation to said insulator and sealed to said insulator annular end,
h) the target located proximate and mounted by the ring, whereby the insulator extends convergently toward and carries the ring and target, and the insulator having an inner conical wall diverging in an axial direction away from the target, ring and gap, the insulator defining a hollow conical frustum along its major diverging extent,
i) and an electrical current feed through element everywhere within said insulator hollow, said inner conical wall diverging away from said feed through element.
2. The neutron generator tube of claim 1 wherein said ion source is connected to one end of said insulator by a metal housing surrounding said accelerating gap region, the other end of said insulator being connected to said target assembly.
3. The neutron generator tube of claim 1 wherein said target assembly is connected and sealed to a first end of said insulator by means of metal housing surrounding said accelerating gap, and a second end of said insulator is connected to said ion source.
4. The neutron generator of claim 1 wherein said insulator comprising two parts, one connected to said ion source, another connected to said target assembly, and there being free ends of said two parts of insulator connected to each other by a metal housing surrounding said accelerating gap.
5. (canceled)
6. The neutron generator tube of claim 1 wherein said insulator has stepped annular surfaces.
7. (canceled)
8. The neutron generator tube of claim 1 wherein said ion source is a Penning-cell type.
9. The neutron generator tube of claim 1 wherein said ion source has vacuum arc configuration.
10. The neutron generator tube of claim 1 wherein said ion source has laser configuration.
11. The neutron generator tube of claim 1 wherein said ion source has electrostatic trap configuration characterized by the following devices:
i) saddle field
ii) orbitron.
12. The neutron generator tube of claim 1 wherein said ion source has radio-frequency excitation configuration.
13. The neutron generator tube of claim 1 wherein the housing has cylindrical shape adapted for combination with an earth borehole tool.
14. In a neutron generator for use in formation logging in a borehole in the earth,
a) an elongated tube,
b) multiple electrodes and target structure in the tube, and an accelerating gap associated with the electrodes,
c) an ion source electrically coupled to the electrodes,
d) and hollow high voltage insulator means protectively associated with the ion source and target structure, said insulator means being everywhere spaced from said gap and from the ion source, and diverging away from the target structure and a ring at the end of the insulator means and proximate the target structure which is mounted by the ring, whereby the gap is essentially free of peripheral exposure to said insulator means, the insulator means defining a hollow conical frustum along its major diverging extent,
e) and electrical current feed through means everywhere within said hollow and surrounded by an inner conical wall defined by the insulator means, said wall diverging away from said element.
15. The generator of claim 14 wherein the insulator means includes spaced apart sections respectively bounding said ion source and target structure.
16. The generator of claim 15 wherein said sections taper directionally toward one another.
17. The generator of claim 16 wherein said sections define hollow cones.
18. The generator of claim 14 wherein said insulator means defines a hollow conical frustum.
19. The generator of claim 14 wherein the generator has a casing joined to opposite ends of the tube, the casing adapted for installation in series with a line in a well, for logging travel in a well as the line is lifted or lowered.