US 6,271,882 B1Granted

TV camera lens device

AssigneeFuji Photo Optical Co., Ltd.

InventorsHiroyuki Kawamura, Hiroshi Mizumura

Life of this patent

Estimating the term…

Loading patent…

Abstract

A TV camera lens device includes a flange back length control signal for moving a master lens group to a position of the proper flange back length in accordance with the operation of a flange back length control. It further includes a macro control signal generating device for outputting a macro control signal for moving the master lens group to a preset macro position where the master lens group is to be positioned during the macro-shooting. Then, either one of the flange back length control signal and the macro control signal is made to take preference in accordance with the operation of a selector switch, and the selected control signal is input to a control circuit. Incidentally, the macro position may be relatively defined as referenced from the position of the proper flange back length.

Claims3

Dependent claims

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;
and
a 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.

8 more elements

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, the master lens group being moved to adjust a flange back length of the TV lens device when a flange back length adjustment is performed, the master lens group being moved to a macro position when a macro-shooting is performed with the TV lens device;
a lens driving device which moves said master lens group along an optical axis in accordance with a signal applied to the lens driving device;
a flange back length control signal generating device which generates a flange back length control signal to move said master lens group to a flange back length position securing a proper flange back length of the TV lens device in accordance with an operation of an external operating member;
a macro control signal generating device which generates a macro control signal to move said master lens group from the flange back length position in a macro move direction by a macro move distance so as to locate the master lens group at the macro position, the macro move direction and the macro move distance being preset with respect to the flange back length position;
a selecting device which determines whether to perform the macro-shooting;
and
a control changeover device including a signal adding device which produces a sum signal by adding the flange back length control signal and the macro control signal, the control changeover device making said lens driving device controllable in accordance with the sum signal when the selecting device determines to perform the macro-shooting, the control changeover device invalidating the macro control signal and making said lens driving device controllable in accordance with the flange back length control signal when the selecting device determines not to perform the macro-shooting.

7 more elements

Dependencies are inferred from the claim text.