Image pick-up device and adjustment mechanism

An image pick-up device which has a lens removably mounted to a lens mount provided to a device body, and receives light coming through the lens by a solid-state image sensor, the image pick-up device comprising:

• a fixed barrel which is fixed to the device body;
• a rectilinearly movable barrel which has a distal end fitted into the fixed barrel and rectilinearly moves along an optical axis;
• a solid-state-image-sensor holding member which is provided to the rectilinearly movable barrel and holds the solid-state image sensor;
• a rotationally movable barrel which moves forward and backward along the optical axis with rotation, and has a female screw portion provided to an inner periphery of the rotationally movable barrel, the female screw portion being screwed on a male screw portion provided to an outer periphery of the fixed barrel;
• an adjusting shaft which has a driving gear portion connected to a driven gear portion provided in an outer periphery of the rotationally movable barrel;
• a connecting portion which is provided to the rotationally movable barrel, is fitted into a groove formed in an outer periphery of the rectilinearly movable barrel, and connects the rotationally movable barrel and the rectilinearly movable barrel;
• a first urging member which is interposed between the connecting portion and one inner wall of the groove and eliminates backlash between the connecting portion and the groove by pressing the connecting portion against the other inner wall of the groove;
• and
• a second urging member which is interposed between the fixed barrel and the rectilinearly movable barrel and eliminates backlash between the female screw portion and the male screw portion by urging the rectilinearly movable barrel backward along the optical axis against the fixed barrel,
• wherein rotation of the adjusting shaft is transmitted to the rotationally movable barrel through the driving gear portion and the driven gear portion so as to move the rotationally movable barrel with rotation along the optical axis, so that the rectilinearly movable barrel is rectilinearly moved along with the rotationally movable barrel along the optical axis through the groove and the connecting portion, thereby adjusting the position of the solid-state image sensor.