Gas sensor module and method of manufacturing gas sensor module

1. A gas sensor module, comprising:

a semiconductor chip on which a gas sensor element is formed; and

a package with a flattened shape including a substrate to which the semiconductor chip is electrically connected and fixed, a side wall firmly attached to the substrate, and a cover firmly attached to the side wall, the package including a detection space in which gas flows around the semiconductor chip, the package having a length in a direction parallel to the semiconductor chip larger than a length in a direction orthogonal to the semiconductor chip; wherein

the package includes a plurality of openings formed in the side wall and/or between the side wall and the cover that communicate with the detection space.

2. The gas sensor module according to claim 1 , wherein the package includes a plurality of openings formed at least between the side wall and the cover that communicate with the detection space, and the cover has a thickness of from 0.01 mm to 2 mm.

3. A gas sensor module, comprising:

a semiconductor chip to which a gas sensor element is formed; and

a package with a flattened shape including a substrate on which the semiconductor chip is electrically connected and fixed, a side wall firmly attached to the substrate, and a cover firmly attached to the side wall, the package including a detection space in which gas flows around the semiconductor chip, the package having a length in a direction parallel to the semiconductor chip larger than a length in a direction orthogonal to the semiconductor chip; wherein

the package includes a plurality of openings that communicate with the detection space, the openings formed in the cover, and a protrusion for forming a passage through which gas is guided to the plurality of openings.

4. The gas sensor module according to claim 3 , wherein the protrusion of the package has a height of from 0.01 mm to 2 mm.

5. A method of manufacturing a gas sensor module, comprising:

forming a side wall forming member on a collective substrate or a cover forming member by injection molding such that the side wall forming member including a plurality of dents corresponding to a chip arrangement space surrounds a plurality of the chip arrangement spaces;

fixing by die bonding a plurality of semiconductor chips, each of which is provided with a gas sensor element, in a plurality of areas of the collective substrate, which corresponds to the plurality of chip arrangement spaces, and electrically connecting the plurality of semiconductor chips by wire bonding to terminals of the collective substrate;

assembling a gas sensor module by bonding the side wall forming member to the cover, the cover forming member, or the collective substrate; and

separating the gas sensor module formed on the collective substrate by dicing at least the side wall forming member and the collective substrate such that the plurality of dents are formed as openings that communicate with the chip arrangement space.

6. A method of manufacturing a gas sensor module according to claim 5 , further comprising;

forming a side wall forming member by injection molding on a collective substrate or a cover forming member such that the side wall forming member surrounds a plurality of chip arrangement spaces;

assembling a plurality of gas sensor modules by bonding the side wall forming member such that a plurality of openings that communicate with the plurality of chip arrangement spaces are formed between covers and the side wall forming member, corresponding to the plurality of chip arrangement spaces;

attaching a dicing tape to close the plurality of openings; and

separating the plurality of gas sensor modules formed on the collective substrate by pouring coolant on a dicing blade while dicing at least the side wall forming member and the collective substrate by the dicing blade.