Pressure detection unit

1. A pressure detection unit comprising: (a) a pressure detection element comprised of a case having an upper end surface and an outer peripheral surface facing in a different direction than the upper end surface, the case being made of stainless steel, aluminum or nickel, an insulating member provided in the case and sealing an one or more through-hole(s) penetrating the case, a pressure detection device provided inside of the case, and a plurality of lead pins electrically connected to terminals of the pressure detection device and provided in the through-hole(s) in a manner penetrating the insulating member; (b) a cover cylindrically formed and accommodating the pressure detection element; (c) a joint member closing an end portion of the cover; and (d) an adhesive provided inside of the cover, and joined to an outside side surface of the case in a manner surrounding the plurality of lead pins, wherein a roughened annular surface portion is formed at a region where the adhesive is joined on the outer peripheral surface facing in the different direction than the upper end surface of the case, and wherein the roughened surface portion is configured with a plurality of grooves formed by performing laser scanning, and wherein the grooves are formed linearly in parallel to each other, or, the grooves are comprised of a first plurality of groove portions formed linearly in parallel to each other and a second plurality of groove portions formed linearly in parallel to each other in a direction intersecting with the first plurality of groove portions.

2. A pressure detection unit comprising: (a) a pressure detection element comprised of a case having an upper end surface and an outer peripheral surface facing in a different direction than the upper end surface, the case being made of stainless steel, aluminum or nickel, an insulating member provided in the case and sealing an one or more through-hole(s) penetrating an inside and an outside of the case, a pressure detection device provided inside of the case, and a plurality of lead pins electrically connected to terminals of the pressure detection device and provided in the through-hole(s) in a manner penetrating the insulating member; (b) a cover cylindrically formed and accommodating the pressure detection element with the plurality of lead pins being directed to an inside of the cylindrical shape in a manner closing an end portion of the cover; and (c) an adhesive provided inside of the cover, and joined to an outside side surface of the case in a manner surrounding the plurality of lead pins, wherein a roughened annular surface portion is formed at a region where the adhesive is joined on the outer peripheral surface facing in the different direction than the upper end surface of the case, and wherein the roughened surface portion is configured with a plurality of grooves formed by performing laser scanning, and wherein the grooves are formed linearly in parallel to each other, or, the grooves are comprised of a first plurality of groove portions formed linearly in parallel to each other and a second plurality of groove portions formed linearly in parallel to each other in a direction intersecting with the first plurality of groove portions.

3. A pressure detection unit comprising: (a) a pressure detection element comprised of a case having an upper end surface and an outer peripheral surface facing in a different direction than the upper end surface, the case being made of stainless steel, aluminum or nickel, an insulating member provided in the case and sealing an one or more through-hole(s) penetrating an inside and an outside of the case, a pressure detection device provided inside of the case, and a plurality of lead pins electrically connected to terminals of the pressure detection device and provided in a manner penetrating the insulating member in the through-hole(s); (b) a cover cylindrically formed and made of copper, copper alloy, or synthetic resin and accommodating the pressure detection element with the plurality of lead pins being directed to an inside of the cylindrical shape in a manner closing an end portion of the cover; (c) a first adhesive provided inside of the cover, and joined to an outside side surface of the case in a manner surrounding the plurality of lead pins, and (d) a second adhesive provided over an entire circumference between the case and an one end portion of the cover and respectively joined to the case and the one end portion of the cover so as to seal therebetween, wherein a roughened annular surface portion is formed at a region either: 1) where the second adhesive is joined on the outer peripheral surface facing in the different direction than the upper end surface of the case; or 2) where the second adhesive is joined on an outer tapered peripheral surface of a receiving member of the case, and wherein the roughened surface portion is configured with a plurality of grooves formed by performing laser scanning, and wherein the grooves are formed linearly in parallel to each other, or, the grooves are comprised of a first plurality of groove portions formed linearly in parallel to each other and a second plurality of groove portions formed linearly in parallel to each other in a direction intersecting with the first plurality of groove portions.

4. The pressure detection unit according to claim 1 , wherein the roughened annular surface portion extends circumferentially about an axis and the outer peripheral surface of the case faces radially outwardly relative to the axis.