| 摘要 |
A lens assembly with a compact diaphragm device incorporated therein, the diaphragm device having an operating member which does not extend beyond the contour of a lens barrel, and a surveillance camera having such a lens assembly are disclosed. The surveillance camera 100 comprises an image pickup lens 104 and a camera main unit 102 . The image pickup lens 104 includes a diaphragm device 126 . The diaphragm device 126 comprises an upper diaphragm blade 210 having an aperture opening, a lower diaphragm blade having an aperture opening, a support frame 230 for supporting the upper and lower diaphragm blades for rectilinear movement thereof, and a diaphragm blade interlocking plate 240 supported for rotation relative to the support frame 230 and adapted to allow the upper diaphragm blade 210 to move rectilinearly in a first direction while permitting the lower diaphragm blade 220 to move rectilinearly in a second direction different from the first direction. The diaphragm blade interlocking member 240 has a center of rotation located within an aperture area defined by the upper and lower diaphragm blade openings at full aperture.
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