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US 4,798,965 AGranted
Optical autocollimation measuring apparatus
AssigneeErwin Sick GmbH Optik-Elektronik
InventorsGunter Fetzer, Klaus Smetana
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AssigneeErwin Sick GmbH Optik-Elektronik
InventorsGunter Fetzer, Klaus Smetana
Estimating the term…
An optical autocollimation measuring apparatus has a light transmitter-receiver arranged in a housing (15). An image of the light source (11) is formed in the objective (12) by a condensor (9) through the beam divider (20). The objective (12) in turn forms an image of the exit pupil of the condensor (9) in the plane of the retroreflector via the measuring path (13). The retroreflector (14) reflects the incident light beam substantially back on itself to the housing (15) of the light transmitter-receiver, where the received light beam is deflected by the beam divider (20) to a photoreceiver (21). A deflecting mirror (16) is located between the front objective (12) and the measuring path (13) and consists of two parts which are pivotable relative to one another, about a pivot axis (25) extending perpendicular to the optical axis (17), from an extended position into a position in which they are displaced by 90.degree. relative to one another. A suitable aperture diaphragm prevents the abutting edges of the two parts of the deflecting mirror being struck by the transmitted light beam.
Optical autocollimation measuring apparatus, in particular transmission measuring apparatus, comprising a light transmitter-receiver arranged in a housing and having a light source which transmits a light beam via a beam divider and an optical system over a measurement path to a retroreflector with the retroreflector reflecting the incident light substantially back on itself to the light transmitter-receiver so that it falls on the beam divider and is deflected by the latter to a photoreceiver to which an electronic processing circuit is connected, which delivers from the electrical output signal of the photoreceiver an indication representative of the optical state along the measurement path, characterised in that a deflecting mirror (16) is arranged between the front objective (12) and the measurement path (13) and consists of two parts (16a, 16b ) which adjoin one another along a straight line standing perpendicular to the optical axis (17), with the parts being pivotable relative to one another about a pivot axis coinciding with the straight line in such a way that by rotating one part (16b ) relative to the other part (16a ) the light incident on the mirror is retroreflected in one dimension.
Optical autocollimation measuring apparatus, in particular transmission measuring apparatus, comprising a light transmitter-receiver arranged in a housing and having a light source which transmits a light beam via a beam divider and an optical system over a measurement path to a retroreflector with the retroreflector reflecting the incident light displaced parallel to itself to the light transmitter-receiver so that it falls on the beam divider and is deflected by the latter to a photoreceiver to which an electronic processing circuit is connected, which delivers from the electrical output signal of the photoreceiver an indication representative of the optical state along the measurement path, characterised in that a deflecting mirror (16) is arranged between the front objective (12) and the measurement path (13) and consists of two parts (16a, 16b) which adjoin one another along a straight line standing perpendicular to the optical axis (17), with the parts being pivotable relative to one another about a pivot axis coinciding with the straight line in such a way that by rotating one part (16b) relative to the other part (16a) the light incident on the mirror is retroreflected in one dimension.
Dependencies are inferred from the claim text.