Device for influencing a light beam in particular for stage illumination

The device for influencing a light beam includes a primitive element and a housing which is arranged at a rotatable arm and which is rotatable with respect to the primitive element by means of one of the several drive units, and into which a light source for generating a light beam may be introduced, wherein at least one control electronics for operating the device is arranged in the rotatable arm or in the housing.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national phase 371 entry of PCT/EP2007/002768 filed 28 Mar. 2007, which claims priority to German Patent Application No. 202006007047.8 filed 28 Apr. 2006.

BACKGROUND OF THE INVENTION

The invention relates to a device for influencing a light beam, in particular a light beam for stage, entertainment or spot illumination.

Such devices are, for example, known as so-called moving heads and are basically arranged as illustrated inFIG. 3. An arm is rotatably mounted to a primitive element, to which in turn a housing is mounted, in which a light source is housed. From several drives, usually two drives, a rotation of the rotatable arm and the housing results. The two axes of rotation around which those movements take place are arranged in a right angle to each other. In the housing itself means may be provided by which the light beam of the light source housed in the housing is influenced, e.g. with regard to its color, as it is obvious for a person skilled in the art.

Hitherto, the complete control electronics and, in particular, also the electronic ballast required, have been arranged in the primitive element, in particular, with Halogen, discharge or LED lamps. This has the advantage that the masses to be moved, in particular of the rotatable arm, may be kept low, which is an advantage also with the comparatively high speeds resulting from low inertial force. However, the primitive element thus also takes up a correspondingly large space.

Similar devices are, for example, known from the U.S. Pat. No. 4,931,916, wherein a light beam may be redirected into different directions by means of rotatorily driven mirrors. As in the solution illustrated inFIG. 3, a rotation takes place around two angularly arranged axes in order to thus be able to cover the complete space, if possible. Also here usually the electronics are arranged in the primitive element.

SUMMARY

According to the embodiment, the device for influencing a light beam may have a primitive element; a housing, which is arranged at an arm rotatable with respect to the primitive element so as to be rotatable by means of a drive unit, and into which a light source may be introduced for generating the light beam, wherein at least one control electronics is arranged in the rotatable arm for operating the device.

At least the basic parts of the control electronics are housed in the arm or head and at least one of the drives is housed in the rotatable arm, which leads to a substantial decrease of the size of the primitive element. This does not only lead to a better appearance but, in particular, also has advantages regarding the placement in stage settings. On the one hand, due to the smaller primitive element a better mounting to the crossbars is possible which are usually provided for mounting illumination elements. In particular, however, the primitive element covers existing sets as little as possible, so that the device may be used without problems and in many ways. Thus, it is not needed any more to hide the primitive element in sets by coloring the same using a corresponding set color which varies from set to set. Constant expensive changes of the color of the primitive elements are thus prevented.

Also the electronic ballast is housed in the rotatable arm or in the head and/or not in the primitive element. All in all, the load on the rotational axis is thus higher as a consequence of the higher mass of the rotatable arm, on the other hand a compact, stable basis results which enables a simpler arrangement. As required, the ballast may also consist of several parts in order to be able to house the same in the rotatable arm. It is advantageous in particular in this case to evenly distribute the additional weight to the arm. If the ballast and/or the weight shifted into the arm, for example, comprises two parts, one part of the ballast is put into the left arm and the other part is put into the right arm, so that the center of gravity of the arm changes less than if the complete weight was shifted into only one part.

Further advantages result from the sub-claims and the following description.

DETAILED DESCRIPTION OF THE INVENTION

Before the invention is described in more detail, it is to be noted, that it is not limited to the respective components of the device and/or the respective method steps, as these components and methods may vary. The terms used here are only designated to describe special embodiments and are not to be used in a limiting sense. When, in addition to that, in the description or in the claims singular forms or indefinite articles are used, the same also refer to the plural forms of those elements, as far as the context does not clearly indicate otherwise.

The invention is based on an implementation according to the prior art, as it is illustrated inFIG. 3. In this implementation, a comparatively large primitive element is provided, via which usually the mounting to a crossbar is performed. This device, just like the inventive device according toFIGS. 1 and 2, serves for influencing a light beam, i.e., for example influencing a light beam for stage, entertainment and spot illumination.

The device may be implemented as a lamp which may, however, also be used for other purposes, in which a movable light source is required.

Via a rotary and/or pivot bearing20, a rotatable arm15is rotatably mounted to the primitive element10. In this arm, a housing16for a light source is arranged, wherein this housing is again rotatably mounted around a rotational axis21with regard to the arm. The rotation of the rotatable arm15and the housing16respectively takes place by actuating drive units, which are not illustrated inFIG. 3. In the housing16a light source is located, which is not illustrated in the drawing, whose light beam may be changed by means for influencing the same.

Depending on the purpose of use, e.g., color, azimuth and height of the light beam may be changed, wherein in the head and/or the housing16, the means for influencing the color, the projection pattern, the focusing, the angle of radiation or the luminance or lightness, respectively, are arranged, while in the arm the motors for controlling the head and thus the light beam in two orthogonal directions, e.g., PAN or TILT or azimuth and height are arranged. The alignment of the light beam takes place by actuating the rotation drives, wherein usually the rotational axis for the rotatable arm15and the rotational axis21for the housing16are in a right angle to each other to possibly be able to reach the complete area. The boundary of this area is limited by the outline of the primitive element in the direction towards the primitive element. It is to be noted, that the useable rotational angle around the rotational axis21becomes the larger the smaller the primitive element becomes. The smaller in particular the surface of the primitive element facing the head, the less the primitive element will shade the light beam when the head is rotated upwards inFIG. 2.

If this embodiment according to the prior art according toFIG. 3is compared to the inventive embodiment according toFIG. 1, it first of all becomes clear that the primitive element10is clearly more compact. The reason for this is, that within the primitive element10, basically only few connector or terminal elements, respectively, are present, e.g., to the power supply network via the mains supply19or for control signals. Apart from that, the primitive element only has to serve as a mounting plate to mount the device, e.g., to a crossbar.

When comparingFIGS. 1 and 3, it further becomes clear that the rotatable arm50is more voluminous. The reason for this is, that within the rotatable arm15, the control electronics17for operating the device and at least one drive unit11for rotating the rotatable arm15are arranged. Within the rotatable arm15according toFIG. 2the complete movement mechanics and control electronics are arranged. Thus, inFIG. 2, in the right part of the handle-like rotatable arm15an electronic ballast18is located, as it is in particular required when the light source is a halogen lamp, a discharge lamp or one or several LEDs. In order to be able to house this ballast within the rotatable arm, which is only indicated in dashed lines inFIG. 2, this ballast18may also consist of several parts. All in all, from this setup a compact look results, as the slight reinforcement of the rotatable arm15is hardly obvious, as simultaneously the effort is made to keep the assembly room as small as possible. Due to the compact primitive element10also mounting to a crossbar is facilitated, at the same time sets are covered as little as possible and the primitive element obstructs the propagation of the light beam less than the larger primitive element according to the prior art.

It is to be noted that electronics and ballast may alternatively also be accommodated partially or completely within the head.

FIG. 2shows, that in the top part of the rotatable arm driven by the motor13, the first drive unit11is provided by means of which the rotatable arm15is rotatable via the bearing20with regard to the primitive element10. In the left part, the motor14with the drive unit12is located for the rotation of housing16around the rotational axis21with regard to the rotatable arm15. Here, the dimensions of the handle-like rotatable arm are selected so that the housing16may rotate by 360° around the rotational axis21, if required. The rotational axis21is further located at ends15aof the rotatable arm15remote from the primitive element10. At the primitive element10, only the most important terminals are provided, so that basically only energy and data lines for the control signals have to be led through the bearing20to the control electronics17in order to operate the device. The primitive element10contains the mains supply19and/or a data terminal for providing data for controlling the device and/or assembly means for mounting the device to a carrier. Drive motors, all electronic parts for controlling the drive motors and for otherwise influencing the light beam etc., are, however, not arranged in the primitive element but in the arm or in the head and/or housing.