Indicator for an optical instrument
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorSHINICHI SUZUKI
Life of this patent
Estimating the term…
Abstract
An indicator for an optical instrument including an observational optical system to observe an image formed by an objective optical system having a focusing lens group, comprising a lens position detecting device to detect a position of the focusing lens group, a distance detecting device to obtain an object distance according to a position of the focusing lens group detected by the lens position detecting device, and a display device to display an object distance detected by the distance detecting device.
Claims30
An indicator for an optical instrument including an observational optical system to observe an image formed by an objective optical system having a focusing lens group, comprising:
- a lens position detecting device to detect a position of said focusing lens group;
- a distance detecting device to obtain an object distance according to a position of said focusing lens group detected by said lens position detecting device;
- and
- a display device to display an object distance detected by said distance detecting device.
An indicator for an optical instrument including an observational optical system to observe an image formed on a predetermined focal plane by an objective optical system having a focusing lens group, comprising:
- a split optical system positioned between said objective optical system and said observational optical system;
- a focusing detecting device to detect a defocus amount at a position equivalent to said focal plane by receiving light divided by said split optical system;
- a lens driving device to drive said focusing lens group according to a defocus amount detected by said focusing detecting device so that said defocus amount becomes a smallest value;
- a lens position detecting device to detect a position of said focusing lens group;
- an object distance detecting device to obtain an object distance according to a position of said focusing lens group detected by said lens position detecting device and according to said defocus amount;
- and
- a display device to display an object distance detected by said object distance detecting device.
An optical apparatus for a surveying instrument comprising:
- a telescopic optical system comprising:
- an objective lens group;
- a focusing lens group;
- a focusing plate;
- an eyepiece lens group for viewing images of objects formed on said focusing plate via said objective lens group and said focusing lens group;
- a lens position detecting device which detects the amount of movement of said focusing lens group from a predetermined reference position;
- an object distance detecting device which detects the object distance with respect to the position of said focusing lens group according to the detected said amount of movement via said lens position detecting device;
- a display device for displaying the detected object distance according to said object distance detecting device.
Dependencies are inferred from the claim text.