Sensor device and method of forming a sensor device
First Claim
Patent Images
1. A sensor device comprising:
- sensor packaging means having a cavity formed therein;
a sensor die mounted on a bottom surface of the cavity; and
a protective coating formed over the sensor die in the cavity, wherein the protective coating is formed from a material having a graduated cross-linking density such that the material at the top of the cavity has a high density of cross-linking and the material at the bottom of the cavity, which material is in contact with the sensor die, has a low density of cross-linking.
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Abstract
A sensor device (20) comprises a sensor package (22) having a cavity (24) formed therein, a sensor die (26) mounted on a bottom surface (28) of the cavity (24) and a protective coating (30) formed over the sensor die in the cavity. The protective coating (30) is formed from a material, preferably a polymer material, which is arranged to have a graduated cross-linking density such that the material at the top of the cavity (24) has a high density of cross-linking and the material at the bottom of the cavity (24), which material is in contact with the sensor die, has a low density of cross-linking.
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Citations
20 Claims
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1. A sensor device comprising:
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sensor packaging means having a cavity formed therein;
a sensor die mounted on a bottom surface of the cavity; and
a protective coating formed over the sensor die in the cavity, wherein the protective coating is formed from a material having a graduated cross-linking density such that the material at the top of the cavity has a high density of cross-linking and the material at the bottom of the cavity, which material is in contact with the sensor die, has a low density of cross-linking. - View Dependent Claims (2)
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3. A sensor device comprising:
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sensor packaging means having a cavity formed therein;
a sensor die mounted on a bottom surface of the cavity; and
a protective coating formed over the sensor die in the cavity, wherein the protective coating comprises;
a bottom layer formed over the die, the bottom layer being formed of uncured polymer material; and
a top layer formed over the bottom layer, the top layer being formed of cured polymer material. - View Dependent Claims (4, 5, 6, 7)
urethane, vynil ether, and acryllated epoxy.
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8. A method of forming a sensor device comprising the steps of:
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providing sensor packaging means having a cavity formed therein;
mounting a sensor die on a bottom surface of the cavity;
introducing a liquid comprising a material into the cavity such that it covers the sensor die; and
exposing a surface of the liquid to a source of energy for a predetermined time until the material has a graduated cross-linking density with the material at the top of the cavity having a high density of cross-linking and the material at the bottom of the cavity, which material is in contact with the sensor die, having a low density of cross-linking, wherein the graduated material provides a protective coating over the sensor die in the cavity. - View Dependent Claims (9, 10, 15, 16, 17, 18, 19)
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11. A method of forming a sensor device comprising the steps of:
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providing sensor packaging means having a cavity formed therein;
mounting a sensor die on a bottom surface of the cavity;
introducing a liquid comprising a polymer material into the cavity such that it covers the sensor die; and
exposing a surface of the liquid to a source of energy for a predetermined time so as to cure a portion of the polymer material, wherein a protective coating is formed over the sensor die in the cavity comprising;
a bottom layer formed over the sensor die and being formed of uncured polymer material; and
a top layer formed over the bottom layer and being formed of cured polymer material. - View Dependent Claims (12, 13, 14, 20)
urethane, vinyl ether, and acrylated epoxy.
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Specification