Image sensor unit, paper sheet distinguishing apparatus, image reading apparatus, and image forming apparatus

A paper sheet distinguishing apparatus for reading a paper sheet while moving at least one of an image sensor unit and the paper sheet,

• wherein the image sensor unit is capable of reading the paper sheet by receiving light from the paper sheet, the image sensor unit comprising:
• a light condenser that collects light from the paper sheet;
• an image sensor that receives the light collected by the light condenser and converts the received light into an electric signal;
• a housing that has an elongated shape that houses the light condenser and the image sensor;
• and
• a rigid member that has an elongated shape and is provided on a side surface elongated in an elongated direction of the housing,
• wherein the housing has a plurality of positions for fixation on the side surface,
• the rigid member is fixed to the side surface of the housing at at least two positions among the plurality of positions for fixation, and
• a warping amount adjusting part is provided between the positions at which the rigid member is fixed to the side surface, the warping amount adjusting part being capable of holding a warping amount in a direction of an optical axis of the light condenser of the housing by intervention of a warping amount adjusting member between the rigid member and the housing.

An image reading apparatus for reading a reading target object while moving at least one of an image sensor unit and the reading target object,

• wherein the image sensor unit is capable of reading the reading target object by receiving light from the reading target object, the image sensor unit comprising:
• a light condenser that collects light from the reading target object;
• an image sensor that receives the light collected by the light condenser and converts the received light into an electric signal;
• a housing that has an elongated shape that houses the light condenser and the image sensor;
• and
• a rigid member that has an elongated shape and is provided on a side surface elongated in an elongated direction of the housing,
• wherein the housing has a plurality of positions for fixation on the side surface,
• the rigid member is fixed to the side surface of the housing at at least two positions among the plurality of positions for fixation, and
• a warping amount adjusting part is provided between the positions at which the rigid member is fixed to the side surface, the warping amount adjusting part being capable of holding a warping amount in a direction of an optical axis of the light condenser of the housing by intervention of a warping amount adjusting member between the rigid member and the housing.

An image forming apparatus, comprising:

• an image reading part that reads a reading target object while moving at least one of an image sensor unit and the reading target object;
• and
• an image forming part that forms an image,
• wherein the image sensor unit is capable of reading the reading target object by receiving light from the reading target object, the image sensor unit comprising:
• a light condenser that collects light from the reading target object;
• an image sensor that receives the light collected by the light condenser and converts the received light into an electric signal;
• a housing that has an elongated shape that houses the light condenser and the image sensor;
• and
• a rigid member that has an elongated shape and is provided on a side surface elongated in an elongated direction of the housing,
• wherein the housing has a plurality of positions for fixation on the side surface,
• the rigid member is fixed to the side surface of the housing at at least two positions among the plurality of positions for fixation, and
• a warping amount adjusting part is provided between the positions at which the rigid member is fixed to the side surface, the warping amount adjusting part being capable of holding a warping amount in a direction of an optical axis of the light condenser of the housing by intervention of a warping amount adjusting member between the rigid member and the housing.