Optical telemeter

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G - Physics

01

S

G01S 7/481 (2006.01) G01S 17/06 (2006.01) G02B 27/09 (2006.01) G02B 27/30 (2006.01)

Patent

CA 2407533

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 1'550 nm, 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 located next to one another and crosswise in relation to the first fields and which also have different diffraction structures. Said deflection element directs the partial beams to the aperture of a collimator (1) in such a way 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, alike the second deflection element (10), are made of plastic. Both parts are glued to opposite sides of the frontal areas of a block (5) made of glass.

Afin d'améliorer l'éclairage cible, une source lumineuse (2) d'un émetteur comportant une diode laser (3) d'une longueur d'onde de 1 550 nm sous forme d'élément à émission par la tranche, présente un dispositif optique de formation de faisceau placé en aval (4), qui comprend une lentille cylindrique (7) ainsi qu'un premier élément de déviation (8) dont les champs possèdent trois structures de diffraction différentes. Cet élément de déviation diffracte des faisceaux partiels, à partir de sections successives de la tranche d'émission, sur des champs d'un second élément de déviation ayant trois structures de diffraction différentes juxtaposées et perpendiculaires aux premiers champs, les faisceaux partiels étant orientés vers l'ouverture d'un collimateur (1) pratiquement rempli par lesdits faisceaux. Le premier élément de déviation (8) et un support (6) pour la lentille cylindrique (7) sont formés d'un seul tenant et sont en matière plastique, tout comme le deuxième élément de déviation (10). Les deux pièces sont collées sur des surfaces de contact opposées d'un bloc (5) en verre.

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