Patent ID: 6271882
Filing Date: 2001-08-07
Classification: G02B

Abstract:
A TV lens device for a TV camera comprising:a lens mount;a focus lens group arranged in the lens mount;a zoom lens group arranged in the lens mount;a master lens group arranged behind the zoom lens group in the lens mount, the master lens group forming an image on a picture screen of the TV camera, at least a part of said master lens group being moved to a preset macro position when a macro-shooting is performed with the TV lens device;a macro control signal generating device which generates a macro control signal to move the at least the part of said master lens group to the preset macro position;a lens driving device which moves the at least the part of said master lens group along an optical axis in accordance with the macro control signal applied from said macro control signal generating device;a flange back length control signal generating device which generates a flange back length control signal to move a whole of said master lens group to adjust a flange back length of the TV lens device in accordance with an operation of an external operating member;a selecting device which determines whether to perform the macro-shooting; anda control changeover device which, when the selecting device determines to perform the macro-shooting, invalidates the flange back length control signal and makes said lens driving device controllable in accordance with the macro control signal and which, when the selecting device determines not to perform the macro-shooting, invalidates the macro control signal and makes said lens driving device controllable in accordance with the flange back length control signal,wherein when the control changeover device makes the lens driving device controllable in accordance with the flange back length control signal, the lens driving device moves the whole of the master lens group along the optical axis in accordance with the flange back length control signal applied from the flange back length control signal generating device.