Structure of connection between optical unit and optical path tube

A structure of connection between an optical unit and an optical path tube, the optical path tube being detachable from the optical unit, the structure comprising:

• an extensible tube constituting at least a part of the optical path tube, the extensible tube being extensible in a tube axis direction;
• a flange attached to one end of the optical path tube;
• a flange receiving part provided on the optical unit, the flange receiving part receiving a front surface of the flange, the front surface of the flange being an end surface on an open side;
• and
• a biasing part configured to bias at least a part of the optical path tube in a direction in which the extensible tube extends, wherein
• an operation tab for operating a limit switch is attached to the optical path tube, and
• the limit switch is attached to the optical unit, operation of the limit switch being performed by means of the operation tab in a state where the front surface of the flange is received by the flange receiving part.

A structure of connection between an optical unit and an optical path tube, the optical path tube being detachable from the optical unit, the structure comprising:

• an extensible tube constituting at least a part of the optical path tube, the extensible tube being extensible in a tube axis direction;
• a flange attached to one end of the optical path tube;
• a flange receiving part provided on the optical unit, the flange receiving part receiving a front surface of the flange, the front surface of the flange being an end surface on an open side;
• and
• a biasing part configured to bias at least a part of the optical path tube in a direction in which the extensible tube extends, wherein
• the optical unit includes a flange accommodating part that accommodates at least a part of the flange,
• an operation tab for operating a limit switch is attached to the optical path tube,
• the limit switch is attached to the optical unit, operation of the limit switch being performed by means of the operation tab in a state where the front surface of the flange is received by the flange receiving part, and
• the operation tab and the limit switch are disposed such that the operation is performed by movement of the optical path tube when the flange goes into the flange accommodating part.