| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deformation of a lens barrel main body caused by temperature change by making a guide member which is provided separately from the lens barrel main body and where a straight advance guide groove is formed in an optical axis direction of material having a thermal expansion coefficient nearly equal to the lens barrel main body. SOLUTION: Three grooves are formed at equal intervals in parallel with an optical axis L on the inner peripheral surface of the lens barrel main body 12. The guide member 16 is attached in the groove by a machine screw 17. A zoom lens 18 is housed and arranged in a state where it is held in a lens frame body 20 in the main body 12. The member 16 is made of the material having the thermal expansion coefficient nearly equal to the main body 12 in order to prevent the deformation of the main body 12 caused by the temperature change. Since the member 16 separate from the main body 12 is produced of the material having the thermal expansion coefficient nearly equal to the main body 12, the deformation of the main body 12 caused by the temperature change is prevented. Thus, a zoom lens 18 is smoothly moved without being influenced by the temperature change.
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