Optical resonance scanner

Abstract

An optical resonance scanner has a spring-elastic bending element (10) excitable to effect rotational oscillations about a longitudinal axis (A-A) using a stationary magnet (9) and a stationary drive coil (5) that is wound around a pole shoe (20). The pole shoe (20) is magnetically coupled to the magnet (9) and has two mutually opposite free ends (21, 22) between which the bending element (10) is arranged symmetrically so that a magnetic flux can be transferred substantially perpendicularly to the longitudinal axis (A-A). In superimposition of the magnet- and coil-induced magnetic fluxes the magnet (9) and a first half (23) of the pole shoe (20) form a first magnetic circuit (30), and the magnet (9) and a second half (24) of the pole shoe (20) form a second magnetic circuit (31), which run in opposite senses with respect to one another in a plane perpendicularly to the longitudinal axis (A-A) through a magnetizable section (6) of the bending element (10).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a national stage application (under 35 USC §371) of PCT / EP20141067059, filed Aug. 8, 2014, which claims benefit of German application No. 20 2013 103 566.1, filed Aug. 8, 2013, the contents of each of which are incorporated by reference herein.BACKGROUND OF THE INVENTIONTechnical Field and State of the Art[0002]The invention relates to an optical scanning device, more particularly to an optical resonance scanner, more particularly a torsional resonance oscillator, comprising a spring-elastic bending element, which can be excited to effect oscillations, more particularly to effect rotational oscillations, more particularly sinusoid rotational oscillations, about a longitudinal axis by means of at least one stationary magnet and by means of at least one stationary drive coil, more particularly up to a defined tilt angle, wherein the drive coil is wound around a pole shoe, which is magnetically coupled to a magnet and has...

AI Technical Summary

Benefits of technology

The invention relates to a scanner with a bending element and a control device for regulating the amplitude of the bending element. The arrangement of the pole shoe and magnet is designed to minimize the occurrence of eddy currents and allows for a variable regulation of the oscillation amplitude across a broad temperature range and maximize the resolution of the oscillation amplitude. This allows for the scanner to be operated under non-constant environmental influences and eliminates the need for expensive zoom optics system for varying the size of the scan field.

Problems solved by technology

It has been recognized according to this embodiment of the invention that the scanning devices known from U.S. Pat. No. 5,557,444 A or DE 695 29 530 T2 result in very long magnetic flux paths due to the special arrangement of the electromagnetic driver parts, more particularly due to the arrangement of the two permanent magnets at the ends of the bending element, which sometimes causes considerable eddy currents and in addition results in losses with respect to the efficiency of the driver due to the accompanying temperature increase in the ferromagnetic material.

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