Methods for packaging image sensitive electronic devices
First Claim
1. A method for assembling a package containing an electronic device sensitive to light or other radiation comprising:
- mounting the electronic device on a carrier substrate having at least one conductive trace thereon, the at least one conductive trace having a first end and a second end;
providing at least one electrical interconnection between a bond pad on the electronic device and the first end of the at least one conductive trace;
encapsulating the first end of the at least one conductive trace, the at least one electrical interconnection and the bond pad of the electronic device with a nonconductive material dispensed in liquid form;
covering a surface of the electronic device with a transparent lid;
curing the liquid nonconductive material to at least a semisolid state; and
retaining the transparent lid by an adhesive interface with the nonconductive material.
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Accused Products
Abstract
The invention provides methods for packaging for electronic devices that are light or other radiation-sensitive, such as image sensors including CCD or CMOS chips. In one embodiment of the invention, an image sensor package is assembled by surrounding a chip with a barrier of transfer mold compound and covering the chip with a transparent lid. In another embodiment of the invention, the perimeter area of a chip, including interconnections such as wire bonds and bond pads, is encapsulated with a liquid dispensed epoxy, and a transparent lid is attached. In yet another embodiment of the invention, chip encapsulation is accomplished with a unitary shell of entirely transparent material. In yet another embodiment of the invention, a substrate-mounted chip and a transparent lid are loaded into a transfer mold that holds them in optimal alignment.
53 Citations
19 Claims
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1. A method for assembling a package containing an electronic device sensitive to light or other radiation comprising:
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mounting the electronic device on a carrier substrate having at least one conductive trace thereon, the at least one conductive trace having a first end and a second end; providing at least one electrical interconnection between a bond pad on the electronic device and the first end of the at least one conductive trace; encapsulating the first end of the at least one conductive trace, the at least one electrical interconnection and the bond pad of the electronic device with a nonconductive material dispensed in liquid form; covering a surface of the electronic device with a transparent lid; curing the liquid nonconductive material to at least a semisolid state; and retaining the transparent lid by an adhesive interface with the nonconductive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for assembling a package containing an electronic device sensitive to light or other radiation comprising:
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mounting an electronic device on a carrier substrate, the carrier substrate comprising at least one conductive trace having a first end and a second end; forming at least one electrical interconnection between the first end of the at least one conductive trace and a bond pad on the electronic device; dispensing a liquid nonconductive material around a perimeter of the electronic device to encapsulate the at least one electrical interconnection, the bond pad and the first end of the at least one conductive trace; placing a transparent lid over the electronic device and in contact with the liquid nonconductive material; and curing the liquid nonconductive material to at least a semisolid state to retain the transparent lid in position over the electronic device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification