Laminate substrate having joining layer of photoimageable material
First Claim
1. A cavity-type chip module, comprising:
- a circuitized laminate layer having opposite planar surfaces and an aperture, the aperture defined by an inner edge in the laminate layer and extending between the planar surfaces;
a planar metal stiffener disposed against one of the planar surfaces of the laminate layer to define respective opposing, mating surfaces, the stiffener having a mounting area spanning the aperture with a boundary defined by the inner edge of the aperture;
a joining layer including a film of photoimageable material interposed between the stiffener and the laminate layer and adhering the mating surfaces to each other;
a window defined in the film of photoimageable material, the window being substantially free of the photoimageable material, the window having dimensions substantially similar to the dimensions of the aperture, the window and the aperture being substantially aligned with each other, whereby the photoimageable material is substantially absent from the mounting area; and
a chip secured to the mounting area and electrically coupled to the circuitized laminate layer, the chip having a planar chip surface disposed against the mounting area, the substantial absence of photoimageable material from the mounting area allowing the planar chip surface to be substantially flush against the mounting area.
1 Assignment
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Accused Products
Abstract
A cavity-type chip module. The module is formed with an adhesive joining layer of photoimageable material interposed between a metal stiffener and a laminate top layer with a central aperture defined in the top layer. The photoimageable material is exposed to actinic radiation, except for an area corresponding to the aperture in the top layer. The unexposed area of photoimageable material is developed away to form a window in the joining layer. The top layer, joining layer, and stiffener are laminated together with the window and aperture aligned, and with a portion of the stiffener spanning the aperture to define a cavity in the resulting substrate. The removal of the unexposed photoimageable material, and the selective exposure of the joining layer to actinic radiation, keep the cavity free of photoimageable material and inhibit bleeding of the photoimageable material into the cavity from its inner edge. As a result, a semiconductor component can be flush mounted in the cavity with optimal thermal conductivity to the metal stiffener.
37 Citations
19 Claims
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1. A cavity-type chip module, comprising:
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a circuitized laminate layer having opposite planar surfaces and an aperture, the aperture defined by an inner edge in the laminate layer and extending between the planar surfaces;
a planar metal stiffener disposed against one of the planar surfaces of the laminate layer to define respective opposing, mating surfaces, the stiffener having a mounting area spanning the aperture with a boundary defined by the inner edge of the aperture;
a joining layer including a film of photoimageable material interposed between the stiffener and the laminate layer and adhering the mating surfaces to each other;
a window defined in the film of photoimageable material, the window being substantially free of the photoimageable material, the window having dimensions substantially similar to the dimensions of the aperture, the window and the aperture being substantially aligned with each other, whereby the photoimageable material is substantially absent from the mounting area; and
a chip secured to the mounting area and electrically coupled to the circuitized laminate layer, the chip having a planar chip surface disposed against the mounting area, the substantial absence of photoimageable material from the mounting area allowing the planar chip surface to be substantially flush against the mounting area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A printed circuit board comprising:
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a circuitized first layer having opposite planar surfaces and an aperture defined in the first layer by an inner edge, the aperture extending between the planar surfaces;
a planar second layer disposed against one of the planar surfaces of the first layer to define respective opposing, mating surfaces, the second layer having a mounting area spanning the aperture with a boundary defined by the inner edge of the aperture; and
a joining layer including a film of photoimageable material interposed between the first and second layers and adhering the mating surfaces to each other;
a window defined in the film of photoimageable material, the window being substantially free of the photoimageable material, the window having dimensions and a location substantially corresponding to the dimensions and location of the aperture, the window and the aperture being substantially aligned with each other, whereby the photoimageable material is substantially absent from the mounting area. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification