| 摘要 |
PROBLEM TO BE SOLVED: To provide a portable type gas detector that has a novel substrate holding structure and can facilitate assembly wiring of internal components and disassembly thereof.SOLUTION: A portable type gas detector is configured to have a tabular control circuit substrate and a gas sensor disposed inside a casing having two casing members mutually coupled and anchored by a fixing screw. A cylindrical boss formed in one of the casing members and includes a plurality of division pieces formed spreadably outward in a radial direction by a slitted groove extending toward an axial direction from a tip is inserted into an attachment hole formed in the control circuit substrate from one surface side of the control circuit substrate, and a columnar protrusion located on the other surface side of the control circuit substrate and formed by the other surface side constituent member is fitted into a hole of the boss, and thereby each of the division pieces is spreaded to thereby allow an inner face of the attachment hole to be pressed by each division piece, and thus, three components of the one of the casing members, the control circuit substrate and the other surface side constituent member are configured to be anchored. |
