Integrated field flattener for sensors
First Claim
1. In combination, a package containing a sensor die and an optically transparent window for permitting electromagnetic radiation to be sensed by said sensor die and for providing an hermetic seal to said package to protect said sensor die against damage and contamination, wherein said optically transparent window includes an optically transparent thermoset plastic lens.
4 Assignments
0 Petitions
Accused Products
Abstract
An integrated circuit package including an optical sensor array is provided with a transparent window comprising a thermoset plastic, such as an epoxy transfer clear molding compound, that is resistant to the elevated temperatures found in semiconductor processing and is configured as a lens, to improve the image quality of the image incident on the sensor. As an example, a field flattener lens is incorporated into the window to form an integral element that also acts as an hermetic seal. Thus, the field flattener is made integral with the sensor. The thermoset lens provides two functions: (1) it improves the image quality; and (2) it protects the sensor from damage and contamination. This protection is normally provided by a glass window on the sensor, but is no longer necessary by virtue of the present invention.
22 Citations
23 Claims
- 1. In combination, a package containing a sensor die and an optically transparent window for permitting electromagnetic radiation to be sensed by said sensor die and for providing an hermetic seal to said package to protect said sensor die against damage and contamination, wherein said optically transparent window includes an optically transparent thermoset plastic lens.
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12. A method for providing an hermetic seal to a package containing a sensor die to protect said sensor die against damage and contamination and for permitting electromagnetic radiation to be sensed by said sensor die through an optically transparent window, said method comprising:
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(a) providing an optically transparent thermoset plastic lens as part of said optically transparent window; and
(b) securing said optically transparent thermoset plastic lens and said optically transparent window to said package. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for forming a transparent epoxy thermoset lens comprising:
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(a) providing pellets containing reactive components to form said epoxy;
(b) placing said pellets in a lens mold;
(c) subjecting said pellets in said mold to a temperature within a range of about 145°
to 160°
C. to form said lens;
(d) subjecting said lens to a post-mold curing time and temperature within a range of 150°
to 160°
C.; and
(e) cooling said lens to ambient temperature. - View Dependent Claims (23)
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Specification