| 摘要 |
PURPOSE:To position easily and accurately a lens when a supporting member is separated by engaging a pin or a hole provided to the collar part of a plastic lens with a hole or a pin provided to the supporting member other than the lens. CONSTITUTION:A front group lens 2 is fitted to a lens barrel 5 provided to a front base plate 4, and a rear group lens 3 consisting of the plastic lens is fixed to a shutter base plate 7 by a light shielding pate 8. Pins 9 and 10 projecting from the collar part 3a of the lens 3 engage holes 11 and 121 provided to the shutter base plate 7 and also engage the hole 13 of the front base plate 4 which supports the front group lens 2, positioning the rear group lens 3 and front group lens 2. In this case, two engagment parts are provided symmetrically and use long-sized holes to attain the engagement smoothly. Therefore, plural groups of lenses are positioned easily and accurately when supported by another supporting member. |
