Sensor mounting structure, fixing device, and image forming apparatus therewith

A sensor mounting structure comprising:

• a positioning member positioning a sensor;
• a holding member provided to be attachable to and detachable from the positioning member so as to form a space in which the sensor is disposed with respect to the positioning member;
• and
• a biasing member made of a wire rod, formed in an annular shape, and composed of a pair of engaging parts engaging with the holding member and a pair of arched parts overhung between the pair of engaging parts,
• wherein the holding member includes a pair of engaging protrusions which are formed while extending in a direction in which the engaging protrusions are distantly spaced from each other in a direction in which the arched parts are overhung,
• either one of the pair of engaging parts is cut,
• the pair of engaging parts are formed in a shape curving or bending so as to respectively overhang on the engaging protrusions,
• the pair of arched parts are arranged side by side in a widthwise direction that crosses a direction pressing the sensor and the overhanging direction,
• each of the pair of arched parts is composed of a pair of supporting lines, a pair of inclination lines, and a contact line,
• the pair of supporting lines are extended in a direction approaching each other from the pair of engaging parts, and come into contact with the holding member,
• the pair of inclination lines are obliquely bent in the pressing direction from one side ends of the pair of supporting lines,
• the contact line has both ends connected to one side ends of the pair of inclination lines, is extended in the overhanging direction, and comes into contact with the sensor, and
• the biasing member, while the holding member is attached to the positioning member, elastically deforms the arched part that is sandwiched between the holding member and the sensor that is disposed in the space so as to bias the sensor to the positioning member.