Patent ID: 7383029

Claim:
A transmitter comprising: an upper case having the shape of a box with a bottom; a sealing rubber covering an inner surface of the upper case; an electronic substrate fitted in the sealing rubber; and an inner plate for preventing the electronic substrate from coming off, wherein the inner plate is a component, which has a bendable shape of unseparated segmentation structure and which is molded into one body, and the inner plate is molded with at least a protruded portion engaging with a groove formed in the inner surface of the upper case and an elastic piece engaging with a periphery of the electronic substrate, and wherein the bent inner plate is placed on the electronic substrate and a force for canceling the bending state is added so that the protruded portion would engage with the groove of the upper case and the elastic piece would engage with the periphery of the electronic substrate, wherein said force for canceling the bending state transforms the inner plate from the bending state into a straight line form, thereby the protruded portion moves in a direction along the straight line to engage with the groove of the upper case, and the elastic piece moves in a direction about perpendicular to the straight line to engage with a groove on the periphery of the electronic substrate.