Leica Geosystems Ag

Bernhard Fiegl

Kurt Giger

Reto Metzler

An electro-optical distance measuring device includes a laser driver for a laser diode for emitting laser light pulses. The laser driver has a laser diode voltage supply for providing a voltage below a laser threshold voltage of the laser diode, an inductive component in a supply path of the laser diode, and an electronic switching element. The electronic switching element is arranged in an interacting manner such that a current flow through the inductive component can be generated in a first switching position of the switching element and the current flow can be conducted through the laser diode in a second switching position of the switching element. One of the laser light pulses can be emitted as the result of a switch from the first switching position to the second switching position, and laser light cannot be emitted in the static first switching position or the static second switching position.

Electro-optical distance measuring device

An electro-optical distance measuring device includes a laser driver for a laser diode for emitting laser light pulses. The measuring device further includes a laser diode voltage supply having a cascade of at least two voltage regulators, each of which provides an output voltage at a level below a laser threshold voltage of the laser diode. By changing from a first to a second switching position of an electronic switching element of the measuring device, one of the laser light pulses can be emitted and, in the steady-state first and the steady-state second switching positions, no laser light is emitted.

The invention relates to an optoelectronic distance measuring device, comprising a transmitting unit and comprising a receiving unit of an electronic evaluating unit. The transmitting unit has a circuit board, a semiconductor laser, and a laser diode driver for transmitting high-frequency intensity-modulated optical radiation. In order to receive a component of the optical radiation reflected by a target object by means of a photosensitive electrical component, the receiving unit is equipped with an electrical output signal as a received signal, a conditioning unit for conditioning the received signal, and an analog/digital converter for digitizing the conditioned received signal. The electronic evaluating unit determines a distance from the distance measuring device to the target object on the basis of a signal propagation time using the digitized received signal. The semiconductor laser is attached to the circuit board as a laser substrate that does not have a housing.

Distance measuring device

The invention relates to an electro-optical distance-measuring device, more particularly a laser rangefinder, with a transmitting unit for transmitting intensity-modulated optical radiation, a receiving unit for receiving a portion of the optical radiation reflected back from a target in a photosensitive electrical component and converting it into an electrical received signal, an input filter for filtering the received signal, an analog-to-digital converter for digitizing the filtered received signal and an electronic analysis unit that calculates the distance from the rangefinder to the target object on the basis of a signal propagation time using the digitized received signal. The input filter is implemented as a time-discrete and continuous-value filter structure, more particularly a digital filter structure.

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Marbach, Switzerland

Bernhard Fiegl