Abstract: A measurement tool includes a first member and a measurement member. The first member has a surface including a chart to be used for calibration of a stereo camera. The measurement member is arranged on the surface of the first member. The measurement member includes a light source and a second member. The light source is configured to emit light with a uniform intensity regardless of a position on the surface. The second member is configured to cover the light source and radiate the light from a plurality of first holes and a plurality of second holes having a size larger than the first hole.

Abstract: A measurement tool includes a first member and a measurement member. The first member has a surface including a chart to be used for calibration of a stereo camera. The measurement member is arranged on the surface of the first member. The measurement member includes a light source and a second member. The light source is configured to emit light with a uniform intensity regardless of a position on the surface. The second member is configured to cover the light source and radiate the light from a plurality of first holes and a plurality of second holes having a size larger than the first hole.

Abstract: A lens barrel includes a plurality of lens groups including a retractable lens group, a plurality of lens retaining frames to retain the plurality of lens groups, a movable lens barrel to retain the plurality of lens retaining frames therein, and a fixed cylinder portion to retain the movable lens barrel therein. The plurality of lens retaining frames, the movable lens barrel and the fixed cylinder portion are configured to move the plurality of lens groups between a collapsed state with at least one portion of the plurality of lens groups collapsed and a photographing state. The plurality of lens retaining frames include a retractable lens retaining frame configured to movably retain the retractable lens group so as to position the plurality of lens groups in photographing positions on a single optical axis in the photographing state and to retract the retractable lens group to a retracted position outside an inside diameter position of the fixed cylinder portion in the collapsed state.

Abstract: A lens barrel includes a plurality of lens groups including a retractable lens group, a plurality of lens retaining frames to retain the plurality of lens groups, a movable lens barrel to retain the plurality of lens retaining frames therein, and a fixed cylinder portion to retain the movable lens barrel therein. The plurality of lens retaining frames, the movable lens barrel and the fixed cylinder portion are configured to move the plurality of lens groups between a collapsed state with at least one portion of the plurality of lens groups collapsed and a photographing state. The plurality of lens retaining frames include a retractable lens retaining frame configured to movably retain the retractable lens group so as to position the plurality of lens groups in photographing positions on a single optical axis in the photographing state and to retract the retractable lens group to a retracted position outside an inside diameter position of the fixed cylinder portion in the collapsed state.

Abstract: A focal plane shutter for digital cameras includes a first driving member for a first blade and a second driving member for the first blade, mounted to the same shaft; arms for the first blade on which a set spring is hooked; and a set member for restraining the first driving member for the first blade in the proximity of the position where the exposure operation is completed, at a set position by rotating a restraining member, and actuating the first driving member for the first blade to the starting position of the exposure operation in the restoration to the initial position immediately after the release.

Abstract: A focal plane shutter for digital cameras includes a first driving member for a first blade and a second driving member for the first blade, mounted to the same shank; arms for the first blade on which a set spring is hooked; and a set member for restraining the first driving member for the first blade in the proximity of the position where the exposure operation is completed, at a set position by rotating a restraining member, and actuating the first driving member for the first blade to the starting position of the exposure operation in the restoration to the initial position immediately after the release.

Abstract: An original document scanning apparatus includes a supporting plate for supporting an original document; a scanning unit, movable relative to the supporting plate, for scanning the original document; a spacer member for regulating a clearance between the supporting plate and the scanning unit; wherein spacer member is in line contact to the supporting plate along a line extending in a moving direction of the scanning unit.

Abstract: An original document scanning apparatus includes a supporting plate for supporting an original document; a scanning unit, movable relative to the supporting plate, for scanning the original document; a spacer member for regulating a clearance between the supporting plate and the scanning unit; wherein spacer member is in line contact to the supporting plate along a line extending in a moving direction of the scanning unit.