| 摘要 |
PURPOSE:To maintain the lens performance of a plastic lense and other lenses inferior in temperature resistance and to expand a use temperature range by providing a deformed absorbing part to the outer circumference of the lens part and suppressing the deformation of the lens due to the temperature fluctuation. CONSTITUTION:A lens body 20 is provided with the lens part 21 to be held in a lens frame 30, a flange-shaped abutting part 22 for the shoulder part 31 of the lens frame 30 is provided to the outer circumference of the lens part 21, and the deformation absorbing part 23 made of curved recessed parts are provided at three equal-interval positions in the outer circumferential direction of the abutting part 22. Then, fixation arms 24 for fixation to the shoulder part 31 of the lens frame 30 is made projected through the deformation absorbing parts 23, and they are formed in one body by an optical synthetic resin member. Consequently, the deformation of the lens with temperature is suppressed and the lens position is made accurate. |
