| 摘要 |
PURPOSE:To improve the assembling efficiency of lenses and to suppress the deformation of lens inclination and lens barrels by providing a lens assembling body with holding grooves for holding lenses, divided mirror barrels to be divided into two parts, a joint member, and through holes penetrated into the outer and inner peripheries of the divided lens barrels. CONSTITUTION:The lens assembling body is provided with holding grooves 23 for holding the lenses 11-13, the divided lens barrels 10 having the holding grooves 23 in their insides and divided into two parts on a plane parallel with the optical axis, the joint member for joining the opposite surfaces of the divided lens barrels 10, and the through holes 24, 25 penetrated into the outer and inner peripheries of the divided lens barrels 10. In case of assembling the lenses 11-13, the lenses 11-13 can be independently inserted into an aperture part of one divided lens holding frame in the direction vertical to the optical axis of the lenses. Consequently, the assembling of the lenses 11-13 can be made easy, and even if the assembling body is left under high temperature environment, air among the thermally expanded lenses 11-13 is exhausted from the lens barrels 10 to the outside through the through holes 24, 25, so that the inclination of the lenses 11-13 and the deformation of the lens barrels 10 which may be generated due to air pressure can be suppressed.
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