Optical telemeter

G - Physics – 01 – C

Patent

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Details

G01C 3/00 (2006.01) G01B 11/14 (2006.01) G01C 3/08 (2006.01) G02B 27/09 (2006.01)

Patent

CA 2463679

In order to improve target illumination, a light source (2) of an emitter, which has a laser diode (3) configured as an edge emitter with a wavelength of 1550nm, has beam-forming optics (4) mounted downstream in relation thereto, which comprise a cylindrical lens (7) and a first deflection element (8) with three fields having different diffraction structures. Said deflection element deflects partial beams, exiting from successive segments of the emission edge, to three fields of a second deflection element (10) which are adjacent to each other and perpendicular to said emission edge and which also have different diffraction structures. Said second deflection element directs the partial beams to the aperture of a collimator (1), such that the partial beams substantially fill said aperture. The first deflection element (8) and a mount (6) for the cylindrical lens (7) are integral and, like the second deflection element (10), are made of plastic. Both parts are stuck on opposite faces of a block (5) made of glass.

Afin d'améliorer l'éclairage d'une cible, une source lumineuse (2) d'un émetteur, comportant une diode laser (3) conçue sous la forme d'un émetteur par la tranche d'une longueur d'onde de 1 550 nm, présente un dispositif optique de mise en forme de faisceau (4), placé en aval et qui comprend une lentille cylindrique (7) ainsi qu'un premier élément de déviation (8), pourvu de trois champs présentant des structures de diffraction différentes. Cet élément de déviation diffracte des faisceaux partiels, émanant de sections successives de la tranche d'émission, sur trois champs d'un second élément de déviation (10) juxtaposés, perpendiculaires à cette tranche d'émission et présentant également des structures de diffraction différentes, lequel second élément de déviation oriente ces faisceaux partiels sur l'ouverture d'un collimateur (1), de sorte que ces faisceaux remplissent sensiblement ladite ouverture. Le premier élément de déviation (8) et un support (6) pour la lentille cylindrique (7) sont formés d'un seul tenant et fabriqués à partir d'une matière plastique, tout comme le second élément de déviation (10). Ces deux pièces sont collées sur des faces opposées d'un bloc (5) en verre.

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