Surveying instrument having an automatic focusing device
First Claim
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1. A surveying instrument, comprising:
- a sighting telescope having a focusing lens group which is movable to focus on an object to be measured;
a distance measuring meter which is adapted to measure a distance between said object and said surveying instrument;
a focusing device which drives said focusing lens group of said sighting telescope in accordance with said distance between said object and said surveying instrument measured by said distance measuring meter; and
an optical distance measuring portion which emits measuring light and receives said measuring light reflected by said object to measure said distance between said object and said surveying instrument, wherein said focusing device comprises an automatic focusing device which controls a focusing operation of said sighting telescope so that said sighting telescope is focused on said object;
wherein said sighting telescope comprises an objective lens, a dichroic prism which permits visible light to pass therethrough, said focusing lens system, an image erecting system, a focusing plate, and an eyepiece system, in this order from an object side, and further wherein said optical distance measuring portion comprises a mirror which reflects said measuring light emitted by a light emitter toward said dichroic prism and said object to be measured, transmitted through said objective lens and reflected by said dichroic prism toward said light emitter, and a light receiver which receives said measuring light reflected by said mirror.
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Abstract
A surveying instrument is provided having a sighting telescope and a distance measuring device. The sighting telescope has a focusing lens group which is moveable to focus an object to be measured. The distance measuring device measures a distance between the object and the surveying instrument. A focusing operation of the sighting telescope is carried out to move the focusing lens group to a focal position of the object in accordance with the distance between the object and the surveying instrument measured by the distance measuring device.
50 Citations
10 Claims
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1. A surveying instrument, comprising:
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a sighting telescope having a focusing lens group which is movable to focus on an object to be measured; a distance measuring meter which is adapted to measure a distance between said object and said surveying instrument; a focusing device which drives said focusing lens group of said sighting telescope in accordance with said distance between said object and said surveying instrument measured by said distance measuring meter; and an optical distance measuring portion which emits measuring light and receives said measuring light reflected by said object to measure said distance between said object and said surveying instrument, wherein said focusing device comprises an automatic focusing device which controls a focusing operation of said sighting telescope so that said sighting telescope is focused on said object; wherein said sighting telescope comprises an objective lens, a dichroic prism which permits visible light to pass therethrough, said focusing lens system, an image erecting system, a focusing plate, and an eyepiece system, in this order from an object side, and further wherein said optical distance measuring portion comprises a mirror which reflects said measuring light emitted by a light emitter toward said dichroic prism and said object to be measured, transmitted through said objective lens and reflected by said dichroic prism toward said light emitter, and a light receiver which receives said measuring light reflected by said mirror. - View Dependent Claims (2, 3)
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4. A surveying instrument, comprising:
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light emitting means which emits measuring light toward an object to be measured; light receiving means for receiving said measuring light reflected by said object to be measured; distance measuring means for measuring a distance of said object in accordance with said measuring light received by said light receiving means; divergence angle adjusting means for adjusting a divergence angle of said measuring light emitted from said light emitting means; and a sighting telescope having a focusing lens system which is movable to focus on the object to be measured; wherein said sighting telescope comprises an objective lens, a dichroic prism which permits visible light to pass therethrough, said focusing lens system, an image erecting system, a focusing plate, and an eyepiece system, in this order from an object side, and further wherein said optical distance measuring portion comprises a mirror which reflects said measuring light emitted by a light emitter toward said dichroic prism and said object to be measured, transmitted through said objective lens and reflected by said dichroic prism toward said light emitter, and a light receiver which receives said measuring light reflected by said mirror. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification