Focusing device for stage lamp

Abstract

The invention discloses a focusing device for a stage lamp. The focusing device comprises a heat-dissipating aluminum plate and a lifting power device arranged on the heat-dissipating aluminum plate, wherein the lifting power device comprises a motor fixing plate, a linear stepping motor, two focusing guide rods, a focusing supporting plate, a flange and a limiting block; the motor fixing plate is fixedly arranged on the heat-dissipating aluminum plate; the linear stepping motor is fixedly arranged on the motor fixing plate; the bottom ends of the two focusing guide rods are respectively and fixedly arranged at the two sides of the motor fixing plate; the top ends of the two focusing guide rods are respectively and fixedly arranged at the two sides of the limiting block; the two focusing guide rods are respectively provided with a bearing in a sheathing manner, and both the two bearings are fixedly arranged on the focusing supporting plate; the focusing supporting plate is fixedly arranged on a lens rotating disc component supporting plate; and the flange is fixedly arranged on the focusing supporting plate, is provided with internal threads and is sheathed on a screw rod. The focusing device disclosed by the invention has the advantages that the screw rod in the linear stepping motor rotates and pushes the flange to move up and down under the guiding of the focusing guide rod so as to drive the focusing supporting plate and the lens rotating disc component supporting plate to move up and down; and the two focusing guide rods are connected with the limiting bock and the motor fixing plate to form a whole body, so that the whole rigidity is strong and the influence from external-force factors is not easily generated.

Description

technical field [0001] The invention relates to the technical field of stage lamps, in particular to a focusing device for stage lamps. Background technique [0002] In the field of stage lamps, in order to obtain efficient, sharp and clear lighting effects, the accuracy, stability and smoothness of the focusing structure in the lamps play an important role, because it will directly affect the lighting effects of the lamps, such as clarity brightness, brightness, etc. [0003] In the prior art, the focusing structure in the lamp: a linear stepping motor cooperates with a focusing guide rod to drive the focusing support plate to work up and down. One end of the focusing guide rod is fixed on the aluminum heat sink, and the other end is not fixed, such as When the focusing stroke is long, the focusing guide rod will become very long, so it is difficult to ensure the balance of both ends. Moreover, the focusing guide rod is easily affected by external factors, resulting in def...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the focusing structure in the lamp: a linear stepping motor cooperates with a focusing guide rod to drive the focusing support plate to work up and down. One end of the focusing guide rod is fixed on the aluminum heat sink, and the other end is not fixed, such as When the focusing stroke is long, the focusing guide rod will become very long, so it is difficult to ensure the balance of both ends. Moreover, the focusing guide rod is easily affected by external factors, resulting in deformation or tilting, resulting in imbalance. This directly affects the smoothness and accuracy of focusing and the speed of instantaneous focusing response

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