SENSOR DEVICE AND PRODUCTION METHOD THEREFOR
First Claim
1. A sensor device comprising:
- a sensor unit comprising a frame made of a semiconductor material and having an opening, a movable portion held in said opening to be movable relative to said frame, and a detecting portion configured to output an electric signal according to a positional displacement of said movable portion; and
a package substrate made of a semiconductor material, and bonded to a surface of said sensor unit;
wherein a region of said frame bonded to said package substrate has one of an activated surface of said frame and an activated surface of an electrical insulating film formed on said frame;
a region of said package substrate bonded to said frame has one of an activated surface of said package substrate and an activated surface of an electrical insulating film formed on said package substrate; and
the bonding between said sensor unit and said package substrate is a solid-phase direct bonding without diffusion between the activated surfaces in the presence of at least one of the electrical insulating films.
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Accused Products
Abstract
A sensor device having small variations in sensor characteristics and improved resistance to electrical noise is provided. This sensor device has a sensor unit, which is provided with a frame having an opening, a movable portion held in the opening to be movable relative to the frame, and a detecting portion for outputting an electric signal according to a positional displacement of the movable portion, and a package substrate made of a semiconductor material, and bonded to a surface of the sensor unit. The package substrate has an electrical insulating film on a surface facing the sensor unit. The package substrate is bonded to the sensor unit by forming a direct bonding between an activated surface of the electrical insulating film and an activated surface of the sensor unit at room temperature.
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Citations
17 Claims
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1. A sensor device comprising:
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a sensor unit comprising a frame made of a semiconductor material and having an opening, a movable portion held in said opening to be movable relative to said frame, and a detecting portion configured to output an electric signal according to a positional displacement of said movable portion; and a package substrate made of a semiconductor material, and bonded to a surface of said sensor unit; wherein a region of said frame bonded to said package substrate has one of an activated surface of said frame and an activated surface of an electrical insulating film formed on said frame; a region of said package substrate bonded to said frame has one of an activated surface of said package substrate and an activated surface of an electrical insulating film formed on said package substrate; and the bonding between said sensor unit and said package substrate is a solid-phase direct bonding without diffusion between the activated surfaces in the presence of at least one of the electrical insulating films. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of producing a sensor device comprising the steps of:
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providing a sensor unit comprising a frame made of a semiconductor material and having an opening, a movable portion held in said opening to be movable relative to said frame, and a detecting portion configured to output an electric signal according to a positional displacement of said movable portion; providing a package substrate made of a semiconductor material; performing a surface activation treatment under a reduced atmosphere to form one of an activated surface of said frame and an activated surface of an electrical insulating film formed on said frame, and one of an activated surface of said package substrate and an activated surface of an electrical insulating film formed on said package substrate; and after the surface activation treatment, forming a direct bonding between the activated surfaces in the presence of at least one of the electrical insulating films at room temperature. - View Dependent Claims (14, 15, 16, 17)
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Specification