| 摘要 |
PURPOSE:To improve the control accuracy of a combination head, by dividing the viewfield of a microscope into two areas by a lens barrel of a large diameter and a reflector and using two image pickup tubes to observe two pieces of head gaps of a VTR with magnification. CONSTITUTION:The image light of a combination head 27, etc. passes through an objective lens 28 is divided and reflected by the 1st and 2nd reflectors 32 and 33 provided within a lens barrel 34 having an inner diameter larger than a magnified image. These divided and reflected beams re made incident to a pair of image pickup tubes 9 set on a camera adaptor 36 which can freely move in the horizontal direction. Thus the magnified image is obtained. As a result, two pieces of head gaps can be easily observed with a high magnification ratio. This lens barrel improves the control accuracy of a combination head. |
