TECHNICAL FIELD

The present invention relates to the technical field of stage lights, and more particularly, relates to a beam shading device capable of accurately positioning and a stage light having the same.

BACKGROUND

With the continuous development of stage light technology, the requirements for diversification of stage effects are getting higher and higher. In order to meet the needs of different application occasions, a shading device located between the light source and the light-emitting lens is usually used to shade the beam, so that the light spot projected by the stage light presents various shapes. The shading device includes a plurality of shading blades. The shading blades are driven to move to block and intercept part of the beam by a driving mechanism to form a preset imaging shape. The existing driving mechanisms are mostly of multi-stage transmission of connecting rods and rocker arms or synchronous belt transmission. However, since there is loose fit for connecting rods and rocker arms after multi-stage transmission and there is also empty space due to the soft contact between the belt and the gear, when the shading blade is reset, it cannot be completely returned to the initial position originally set. During the shading process of the shading blade, the shading accuracy will also be affected, which in turn affects the stage effect.

SUMMARY

The present invention aims to overcome at least one of the above-mentioned drawbacks of the prior art, and provides a beam shading device capable of accurately positioning. The shading blade is driven by a driving mechanism which is driven by a driving gear and a rack, and the position of the shading blade can be accurately controlled during the shading process, so that the shading accuracy of the shading blade can be effectively improved during the shading process, and the consistency and accuracy of the shading pattern can be ensured.

According to the present invention, the beam shading device capable of accurately positioning includes a substrate, a plurality of shading blades mounted on the substrate, and driving mechanisms for driving the shading blades to move. The substrate is provided with a first light-passing hole through which beams pass. The plurality of shading blades are arranged around the periphery of the first light-passing hole. The driving mechanisms drive the shading blades to move back and forth to block and open the first light-passing hole. Each of the shading blades is configured with at least two driving mechanisms, and each of the driving mechanisms includes a driving gear and a driving plate. The driving plate is hinged with the shading blade, and the driving plate is provided with a rack that meshes with the driving gear.

In the present invention, each shading blade of the beam shading device is configured with at least two driving mechanisms, and each driving mechanism can independently drive the shading blade to move back and forth to block and open the first light-passing hole. When two driving mechanisms of each shading blade maintain a consistent state of motion, the driving mechanisms drive the shading blade to perform a translation movement. However, when the motion states of all driving mechanisms are not the same, since the driving plate is movably connected to the shading blade, the driving mechanisms can drive the corresponding shading blade to perform a swing movement. The specific work process is as follows. The driving gear rotates to drive the driving plate to move, thereby driving the shading blade to perform a translation and/or swing movement, so that the shading blade reaches a preset position, and the beam is shaded into a preset shape. The beam shading device uses driving mechanisms driving by a driving gear and a rack to drive the shading blade, and the driving plate provided with the rack is directly hinged with the shading blade, without using transmission parts such as a connecting rod to indirectly drive the effect piece. Such configuration reduces the problem of empty space caused by multi-stage transmission, and the position of the shading blade can be accurately controlled during the shading process, the shading accuracy of the shading blade thus can be effectively improved during the shading process, and the consistency and accuracy of the shading pattern can be ensured.

According to the present invention, the driving plate is provided with a linear first guide groove opened towards the direction of the first light-passing hole. The substrate is provided with a first sliding post adapted to the first guide groove, and the first sliding post penetrates the first guide groove and is slidable in the first guide groove. On one hand, the first sliding post plays a role of supporting the driving plate, and on the other hand, it can also guide the driving plate to move along the first guide groove.

According to the present invention, the rack is arranged in parallel with the first guide groove. The direction of the first guide groove is kept consistent with the direction of the rack, which ensures that the driving plate can be continuously driven to move without changing the position of the driving gear during the movement of the driving plate.

both ends of the first guide groove bend and extend towards the direction of the rack. In two of the driving plates provided on the same shading blade, when one driving plate moves towards the first light-passing hole and the other driving plate does not move towards the first light-passing hole, and the first sliding post is located at an end position of the first guide groove, the driving plate that does not move will be caused to rotate around its own first sliding post due to the joint action of the driving plate that moves. The end of the first guide groove bends and extends towards the direction of the rack, leaving a smooth rotation space for the first sliding post of the driving plate that does not move, and the corresponding shading blade will not be suddenly jammed.

The driving gear is made of metal, and the rack is made of rubber. The driving gear and the rack are made of two materials of metal and rubber. Compared with the case where both use metal materials, the use of two materials in which one is soft and the other is hard can reduce the noise generated by the movement of the two. The rubber material has a high elasticity with reversible deformation. What's more, when squeezed by the driving gear, it can be elastically deformed, so as to adaptively adjust the meshing tightness of the driving gear and the rack and adjust the fitting state of the driving gear and the rack to the best to ensure the shading accuracy of the shading blade during the shading process.

According to the present invention, the driving plate is provided with a plurality of metal tooth tips on the side on which the rack is provided at the end close to the shading blade, which mesh with the driving gear. When the driving gear meshes with the metal tooth tips, the shading blade is in the reset state. The shading blade will return to the reset state several times during the shading process. Compared to tooth tips made of rubber, the provision of metal tooth tips at the end of the driving plate close to the shading blade can reduce wear and increase the service life of the driving plate.

Two the driving plates of each shading blade are arranged on a side of the shading blade far away from the first light-passing hole, and the vertical distance between the center of the first light-passing hole and each of the driving plates is equal. That is, each of the shading blades is configured with at least two driving mechanisms, and two symmetrical sets of the driving mechanisms jointly drive the shading blade to move back and forth to block and open the first light-passing hole, so that the movement of the shading blade will be more stable.

According to the present invention, a first panel and a second panel that are a stacked arrangement are fixed on the substrate, and both the first panel and the second panel are provided with a second light-passing hole corresponding to the first light-passing hole. A plurality of the shading blades are provided between the first panel and the second panel. The first panel and the second panel are configured to protect the shading blades, and prevent the shading blades from being interfered by other elements during the movement process and being jammed.

Both the first panel and the second panel are provided with a second guide groove corresponding to each of the shading blades, and the second guide groove is arranged along the radial direction of the first light-passing hole. Each of the shading blades is provided with a second sliding post slidingly fitted with the second guide groove. The second sliding post can slide in the second guide groove, so that the entire shading blade does not deviate, and the shading blade is guided to move towards or away from the second light-passing hole only. It should be noted that the shading blade may be fitted with the second guide groove of the first panel or the second panel according to whether it is close to the first panel or the second panel.

According to the present invention, screw holes used for fixing the driving motor on the substrate are elongated through holes. By designing the screw holes to be elongated, the installation position of the driving motor can be adjusted appropriately, and then the tightness of the driving gear and the rack can be adjusted to optimize the cooperation of the driving mechanisms.

The present invention further provides a stage light including a light source and the beam shading device described above. According to the present invention, the beam shading device partially blocks and intercepts a beam emitted by the light source, so that a stage light can project a light spot in a specific shape.

