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AssigneeTopcon Corporation
InventorsFumio Ohtomo, Hiroo Sugai, Ikuo Ishinabe, Takaaki Yamazaki, Junichi Kodaira
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A tilt angle automatic compensator used for a device requiring verticality or horizontality is disclosed. The automatic compensator comprises a container 4 where a transparent liquid to form free liquid surface 1 is sealed, a light projection system for projecting light beam toward the free liquid surface at a predetermined angle so that it is totally reflected on the free liquid surface, and an optical system arranged at a predetermined position along optical path of the totally reflected light beam after passing through the container with sealed liquid and for equalizing change of reflection angle of optical axis corresponding to change of incident angle of optical axis in all directions. When the liquid container is tilted and incident angle of the light beam is relatively changed with respect to the free liquid surface, sensitivity varying according to the direction of change of reflection angle is optically compensated.
A tilt angle automatic compensator, comprising a container where a transparent liquid to form a free liquid surface is sealed, a light projection system for projecting a light beam toward the free liquid surface at a predetermined angle so that it is totally reflected from the free liquid surface along an optical path, and an optical system, arranged at a predetermined position along the optical path of the totally reflected light beam after passing through the container with sealed liquid, for equalizing in all directions change of the reflection angle of the reflected beam corresponding to change of incident angle of the incident beam.
A tilt angle automatic compensator, comprising a container where a transparent liquid to form a free liquid surface is sealed, a light projection system for projecting a light beam toward the free liquid surface at a predetermined angle so that it is totally reflected from the free liquid surface along a first optical path, a mirror for re-reflecting in a vertical direction along a second optical path the light beam reflected from the free liquid surface, a first optical system, arranged at a predetermined position along said first optical path, for equalizing in all directions change of the reflection angle of the reflected beam corresponding to change of incident angle of the incident beam and a second optical system, arranged at a predetermined position along said second optical path, for offsetting angular change of the re-reflected beam corresponding to change of incident angle of the incident beam.
Dependencies are inferred from the claim text.