EP3450836B1

EP3450836B1 - Framing system for an automated luminaire

Info

Publication number: EP3450836B1
Application number: EP18191994.5A
Authority: EP
Inventors: Pavel Jurik; Josef Valchar
Original assignee: Robe Lighting sro
Current assignee: Robe Lighting sro
Priority date: 2017-09-01
Filing date: 2018-08-31
Publication date: 2021-01-13
Anticipated expiration: 2038-08-31
Also published as: EP3450836A1

Description

TECHNICAL FIELD OF THE DISCLOSURE

The disclosure generally relates to an automated luminaire, and more specifically to a framing system for an automated luminaire.

BACKGROUND

Luminaires with automated and remotely controllable functionality are well known in the entertainment and architectural lighting markets. Such products are commonly used in theatres, television studios, concerts, theme parks, night clubs, and other venues. A typical product will commonly provide control over the pan and tilt functions of the luminaire allowing the operator to control the direction the luminaire is pointing and thus the position of the light beam on the stage or in the studio. Typically, this position control is done via control of the luminaire's position in two orthogonal rotational axes usually referred to as pan and tilt. Many products provide control over other parameters such as the intensity, color, focus, beam size, beam shape, and beam pattern. Figure 1 illustrates a typical multiparameter automated luminaire system 10. These systems typically include a plurality of multiparameter automated luminaires 12 which typically each contain on-board a light source (not shown), light modulation devices, electric motors coupled to mechanical drives systems, and control electronics (not shown). In addition to being connected to mains power either directly or through a power distribution system (not shown), each luminaire 12 is connected is series or in parallel via data link 14 to one or more control desks 15. An operator typically controls the automated luminaire system 10 through the control desk 15.
An optical effect that is commonly used in prior art automated luminaires is often referred to as a prism. This is typically a glass or plastic device placed at a point in the optical train such that it converts a single image produced by the beam color, size, shape, and pattern optical systems into multiple beams for display. For example, a linear prism may convert a single beam into a linear array of identical beams. A diagrammatic example of the effects produced by a prior art prism optical system is shown in Figures 2 and 3. In Figure 2, a single image 20 produced by the beam color, size, shape, and pattern optical systems passes through a prism 21a, resulting in multiple copies of the image 20 as output images 22a. The prism 21a may be rotated as indicated by the arc 23, causing a corresponding rotation in the array of output images as indicated by the arc 24. Figure 3 shows the same optical system and prism 21a, but with the prism 21a rotated to a new position, resulting in a corresponding rotation of the output images 22b. Image 20 is here shown for clarity as a simple circular image; however, the image 20 may be any image, complex or simple, as produced by the automated luminaire, in particular it may have a shape defined by patterns or gobos in the optical train.
In further prior art systems the prism may be different shapes and may be capable of being inserted or removed from the light beam automatically. It may further be possible to select different prisms producing different effects for insertion in the beam. However, the prior art systems are only capable of introducing a single prism at one time.
It would be advantageous to provide a system for an automated luminaire that was capable of introducing a plurality of prisms into the optical effect chain simultaneously such that the effects concatenate. It would further be advantageous to be able to selectively and cooperatively coordinate the insertion, position, and rotation of the plurality of prisms to produce new dynamic lighting effects.
Reference is made to documents WO 2016/054418 and WO 2012/138770 which have been cited as relating to the state of the art. WO 2016/054418 is directed to a luminaire system including first and second linear prisms aligned in a parallel manner so that the resultant image array is also linearly aligned. Both first prism and second prism may be rotated and cause a change in pattern and rotation in the array of output images. The prisms are replicating prisms. WO2012/1138770 also describes prisms for use in effects. Prior art framing systems are also discussed at paragraph 0062 of the present specification.

SUMMARY

It will be appreciated that the scope of the invention is in accordance with the claims. Accordingly, there is provided a framing system as defined in claim 1. There is further provided an automated luminaire comprising the framing system as defined in claim 8. Claim 14 provides a method for shaping a light beam. Further features are provided in the dependent claims.
It will be appreciated that the specification may include arrangements outside the scope of the claims provided as background and to assist in the understanding of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following description taken in conjunction with the accompanying drawings in which like reference numerals indicate like features and wherein:

Figure 1 illustrates a typical prior art automated lighting system;
Figure 2 illustrates a prior art prism effects system;
Figure 3 illustrates a prior art prism effects system;
Figure 4 illustrates an optical system with a first coordinated effects system according to the disclosure in a first configuration;
Figure 5 illustrates the first coordinated effects system of Figure 4 in a second configuration;
Figure 6 illustrates the first coordinated effects system of Figure 4 in a third configuration;
Figure 7 illustrates the first coordinated effects system of Figure 4 in a fourth configuration;
Figure 8 illustrates the first coordinated effects system of Figure 4 in the second configuration with an alternative second prism;
Figure 9 illustrates an automated luminaire according to the disclosure, fitted with the first coordinated effects system of Figure 4;
Figure 10 illustrates an effect of the first coordinated effects system of Figure 4 in the fourth configuration with prisms of the first coordinated effects system in a first position relative to each other;
Figure 11 illustrates an effect of the first coordinated effects system of Figure 4 in the fourth configuration with prisms of the first coordinated effects system in a second position relative to each other;
Figure 12 illustrates an optical system including a second coordinated effects system according to the disclosure in a first configuration;
Figure 13 presents a simplified view of the second coordinated effects system of Figure 12 in a second configuration;
Figure 14 presents a simplified view of the second coordinated effects system of Figure 12 in the first configuration;
Figure 15 presents a block diagram of a control system for an automated luminaire according to the disclosure;
Figure 16 illustrates a barrel prism for use in a framing system according to the disclosure;
Figure 17 illustrates the effect of a prior art ribbed or linear prism;
Figure 18 illustrates the effect of a framing system according to the disclosure, using a barrel prism of the type shown in Figure 16; and
Figure 19 illustrates the effect of a framing system according to the disclosure, using two barrel prisms of the type shown in Figure 16.

DETAILED DESCRIPTION

Preferred embodiments are illustrated in the figures, like numerals being used to refer to like and corresponding parts of the various drawings.
Disclosed herein are a coordinated effects system and an automated luminaire. The automated luminaire includes a light source, an optical device, a first prism system, a second prism system, and a control system. The light source is configured to emit a light beam. The optical device is configured to produce a first image in the light beam. The first and second prism systems include corresponding first and second pluralities of prisms and are configured to position selected ones of their respective prisms in the light beam or to remove all of their prisms from the light beam. The first prism system is configured to rotate the selected one of its prisms to produce a modified image from the image. The second prism system is configured to rotate the selected one of its prisms to produce an output image from the modified image. The control system is configured to control the first and second prism systems.
Figure 4 illustrates an optical system with a first coordinated effects system 400 according to the disclosure in a first configuration. A light source 32 produces a light beam whose optical axis is shown by dotted line 36. The light beam may pass through gobo wheel 34 and optical lenses 37 and 38 before being emitted from the luminaire. The optical system is shown here much simplified for clarity and, in practice, an automated luminaire may include further optical devices, including but not restricted to, a color wheel, a color mixing mechanism, a rotating gobo, an effects wheel, an iris, a framing shutters mechanism, and other optical devices as known in the art.
The first coordinated effects system 400 includes a first prism system 40. The first prism system 40 comprises a first prism 42 rotatably mounted to a first prism arm 41. A motor 44 is configured to rotate the first prism 42 within first prism arm 41 via a belt 46. Motor 43 is configured to rotate the first prism arm 41 via a gear 45 to insert or remove the first prism 42 into the light beam. The motors 43 and 44 may be operated in a coordinated manner such that the first prism 42 is inserted or removed from the light beam and rotated within the light beam as desired by an operator. The motors 43 and 44 may be of a type selected from, but not restricted to, stepper motor, servo-motor, actuator, solenoid, and other motor types as known in the art. In the configuration shown in Figure 4, the first prism 42 is positioned outside of the light beam and has no effect on the light beam emitted from the luminaire.
The first coordinated effects system 400 further includes a second prism system 50. The second prism system 50 comprises a second prism 52 rotatably mounted to a second prism arm 51. The motor 54 is configured to rotate the second prism 52 within the second prism arm 51. A motor 53 is configured to rotate the second prism arm 51 to insert or remove the second prism 52 into the light beam. The motors 53 and 54 may be operated in a coordinated manner such that second prism 52 is inserted or removed from the light beam and rotated within the light beam as desired by the operator. The motors 53 and 54 may be of a type selected from, but not restricted to, stepper motor, servo-motor, actuator, solenoid, and other motor types as known in the art. In the configuration shown in Figure 4, the second prism 52 is positioned outside of the light beam and has no effect on the light beam emitted from the luminaire.
Either or both of the first prism system 40 and the second prism system 50 may include sensors such that the control system of the automated luminaire is aware of, and able to control, the orientation and/or rotation of the first prism 42 and the second prism 52. For example, as illustrated in Figure 4, the second prism 52 is fitted with a magnet 57 in its periphery that rotates with the second prism 52. A corresponding sensor or sensors (not shown) such as a Hall effect sensor in second prism system 50 may detect the position of magnet 57, and thus sense the rotational position of second prism 52 at the moment the magnet 57 is detected. Similarly, first prism system 40 may be fitted with a magnet and sensor or sensors such that the rotational position of first prism 42 is known and communicated to the control system of the automated luminaire 100. The sensor systems are not restricted to a magnet and Hall effect sensor, and any sensing system may be utilized in other coordinated effects system according to the disclosure, including, but not restricted to, magnetic sensors, optical sensors, and switch sensors.
Figure 5 illustrates the first coordinated effects system 400 in a second configuration. In Figure 5, the motor 43 has been operated from the configuration shown in Figure 4 to rotate the first prism arm 41, and thus the first prism 42 has been inserted into the light beam. The second prism 52 remains outside the light beam. In this configuration, the first prism 42 alone will produce an effect in the light beam. The first prism 42 may be rotated while in the light beam by the motor 44, producing effects similar to those illustrated in Figures 2 and 3.
Figure 6 illustrates the first coordinated effects system 400 in a third configuration. In Figure 6, the motor 53 has been operated from the configuration shown in Figure 4 to rotate the second prism arm 51, and thus the second prism 52 has been inserted into the light beam. The first prism 42 remains outside light beam. In this configuration, the second prism 52 alone will produce an effect in the light beam. The second prism 52 may be rotated within the light beam by the motor 54, producing effects similar to those illustrated in Figures 2 and 3.
Figure 7 illustrates the first coordinated effects system 400 in a fourth configuration. In Figure 7, the motor 43 has been operated from the configuration shown in Figure 4 to rotate the first prism arm 41, and thus the first prism 42 has been inserted across the light beam. Further, motor 53 has also been operated to rotate the second prism arm 51, and thus the second prism 52 has been inserted into the light beam. In this position both the first prism 42 and the second prism 52 will produce effects in the light beam. The first prism 42 and the second prism 52 may be rotated while in the light beam by the motors 44 and 54, respectively. The second prism 52 receives the light beam after it has passed through, and been affected by, the first prism 42. Thus, the effect produced by the first prism 42 is then further modified by the second prism 52.
Figure 8 illustrates the first coordinated effects system 400 in the second configuration with an alternative second prism 58. Similarly, first prism 42 may be replaced with alternative prism designs.
Figure 9 illustrates an automated luminaire 100 according to the disclosure, fitted with the first coordinated effects system 400.
Figures 10 and 11 illustrate effects of the first coordinated effects system 400 in the fourth configuration. Figure 10 illustrates an effect of the first coordinated effects system 400 with the first prism 42 and the second prism 52 in a first position relative to each other. A single image 60 produced by beam color, size, shape, and pattern optical systems of the automated luminaire 100 passes through first prism 42 and second prism 52, resulting in multiple copies of the image 60 as output image 63a. Image 60 is here shown for clarity as a simple circular image; however, image 60 may be any complex image as produced by the automated luminaire, in particular it may have a shape defined by the patterns or gobos in the optical train.
Because the first prism 42 and the second prism 52 are both linear prisms and are aligned in a parallel manner, the resulting output image 63a is also linearly aligned. However, both first prism 42 and second prism 52 may be rotated independently, as indicated by arcs 64 and 65, respectively, causing a change in pattern and rotation (as indicated by arc 66) in the output image 63a. For example, if the first prism 42 and second prism 52 are rotated in the same direction at the same speed, maintaining their rotational alignment, the output image 63a will maintain its shape and rotate.
Figure 11 illustrates an effect of the first coordinated effects system 400 in the fourth configuration with the first prism 42 and the second prism 52 of the first coordinated effects system 400 in a second position relative to each other. The first prism 42 remains in the same position as in Figure 10; however, the second prism 52 has been rotated 90° to a new position orthogonal to its position in Figure 10. In this configuration, the linear effect of the first prism 42 still forms a single linear array of the image 60; however, the second prism 52 now acts on that first linear array in an orthogonal direction, resulting in an output image 63b that is a matrix array of the linear array produced by the first prism 42. As described with reference to Figure 10, if the first prism 42 and second prism 52 are rotated in the same direction at the same speed, maintaining their rotational alignment, the output image 63b will rotate while maintaining its shape.
Intermediate angles between the first prism 42 and the second prism 52 to the angles shown in Figures 10 and 11 will produce output images intermediate between output images 63a and 63b that change shape and configuration smoothly as the angle between the first prism 42 and the second prism 52 changes. If the angle changes slowly, the variation in the output images also changes slowly. Similarly, if the angle changes quickly, the variation in the output images also changes quickly.
The first prism 42 and the second prism 52 may be simultaneously rotated in a coordinated manner, such that the angle between them remains constant. For example, both prisms may be rotated in the same direction at the same speeds, thus maintaining the difference in angle between them. This results in an output image that remains static and rotates at the same rate as the prisms. In some embodiments, such rotation may be performed without information received from sensors fitted to the first prism 42 and the second prism 52. In other embodiments, the sensors fitted to the first prism 42 and the second prism 52 enable the control system of the automated luminaire 100 to maintain improved coordination in the rotation and positioning of the prisms. The first prism 42 and the second prism 52 may be simultaneously rotated in a coordinated manner at differing speeds and/or in differing directions, resulting in output images that change and/or rotate. Either or both of the first prism 42 and the second prism 52 may be rotated while the other is held static (i.e., at a rotational speed of zero). Speeds and rotation directions and positions may be accurately controlled through the sensors to produce accurate and repeatable coordinated effects in the output images.
Figure 12 illustrates an optical system including a second coordinated effects system 1200 according to the disclosure in a first configuration. The second coordinated effects system 1200 may be used in place of the first coordinated effects system 400 in an automated luminaire according to the disclosure, or elements of the second coordinated effects system 1200 may be added to the first coordinated effects system 400 in the automated luminaire 100. A light source 132 produces a light beam whose optical axis is shown by dotted line 136. The light beam passes through a gobo wheel 134 and optical lenses 137a, 137b, and 138 before being emitted from the luminaire. The optical system is shown here much simplified for clarity and, in practice, the automated luminaire may include further optical devices including but not restricted to a color wheel, a color mixing mechanism, a rotating gobo, an effects wheel, an iris, a framing shutters mechanism, and other optical devices as known in the art.
The second coordinated effects system 1200 includes a first prism system 140. The first prism system 140 comprises a prism 142a, a prism 142b, and a prism 142c, all rotatably mounted to a first prism support (or arm) 141. A motor (not shown) is configured to rotate the prisms 142a, 142b, and 142c within the first prism support 141. A second motor (not shown) is configured to rotate the first prism support 141 to insert one of the prisms 142a, 142b, or 142c into the light beam, or to remove all three prisms from the light beam. The motors may be operated in a coordinated manner such that one of the prisms 142a, 142b, and 142c is inserted or removed from the light beam and rotated within the light beam, as desired by the operator. The motors (or actuators) may be of a type selected from, but not restricted to, stepper motor, servo-motor, actuator, solenoid, and other motor types as known in the art. In the configuration shown in Figure 12, the prisms 142a and 142b are positioned outside of light beam and will have no effect on the exiting light beam, while the prism 142c is positioned in the light beam.
The second coordinated effects system 1200 further includes a second prism system 150. The second prism system 150 comprises a prism 152a, a prism 152b, and a prism 152c rotatably mounted to a second prism support (or arm) 151. A third motor (not shown) is configured to rotate the prisms 152a, 152b, and 152c within the second prism support 151. A fourth motor (not shown) is configured to rotate the second prism support 151 to insert one of the prisms 152a, 152b, or 152c into the light beam, or to remove all three prisms from the light beam. The motors may be operated in a coordinated manner such that one of the prisms 152a, 152b, and 152c is inserted or removed from the light beam and rotated within the light beam, as desired by the operator. The motors (or actuators) may be of a type selected from, but not restricted to, stepper motor, servo-motor, actuator, solenoid, and other motor types as known in the art. In the configuration shown in Figure 12, the prisms 152a and 152b are positioned outside of light beam and will have no effect on the exiting light beam, while the prism 152c is positioned into the light beam. In these positions the prism 142c and the prism 152c are both positioned in the light beam and will interact to produce results similar to those shown in Figures 2, 3,10, and 11.
In the first configuration of the second coordinated effects system 1200, the prism 142c of the first prism system 140 is positioned in the light beam produced by the light source 132. The prism 152c of the second prism system 150 is positioned in the light beam as modified by the first prism system 140. As described with reference to Figures 10 and 11, the prism 142c produces a first effect in the light beam (or modified image) and the prism 152c produces a second effect in the light beam as modified by the prism 142c, resulting in an output image.
The ability to position selected prisms from one or both of the first prism system 140 and the second prism system 150 in the light beam, and to selectively rotate either or both of the selected prisms enables an operator of an automated luminaire according to the disclosure to concatenate the effects of the selected prisms and to selectively and cooperatively coordinate the insertion and rotation of the selected prisms to produce new dynamic lighting effects.
When the second coordinated effects system 1200 is in a configuration similar to that shown in Figure 6 (i.e., with the prisms of the first prism system 140 removed from the light beam and a prism from the second prism system 150 positioned in the light beam), the prism from the second prism system 150 is still characterized for purposes of this disclosure as receiving the light beam as modified by the first prism system 140.
Either or both of the first prism system 140 and the second prism system 150 may further include sensors such that the control system of the automated luminaire is able to detect and control the orientation and/or rotation of the prisms 142a, 142b, or 142c and the prisms 152a, 152b, or 152c. For example, each of the prisms may be fitted with magnets in their respective peripheries that rotate with them. A corresponding sensor or sensors (not shown) such as a Hall effect sensor in the first prism system 140 and the second prism system 150 may detect the position of the magnets, and thus deduce the rotational position of the prisms.
The sensors are not restricted to a magnet and Hall effect sensor, and any sensing system may be utilized in other embodiments of the disclosure, including, but not restricted to, magnetic sensors, optical sensors, and switch sensors. In some embodiments, a single sensor may be used for each of the first prism system 140 and the second prism system 150, mounted in positions that permit them to sense whichever of the prisms of the first prism system 140 and/or the second prism system 150 are positioned in the light beam.
While the prism systems 140 and 150 are described as each comprising a single motor that rotates all three prisms in its prism system, it will be understood that in other embodiments a prism system according to the disclosure may include one or more actuators to individually rotate one or more associated prisms in the prism system.
Figure 13 presents a simplified view of the second coordinated effects system 1200 of Figure 12 in a second configuration. In Figure 13 both first prism support 141 and second prism support 151 have been rotated to remove all prisms from the light beam. A first motor (not shown) is configured to rotate the prisms 152a, 152b, or 152c within the second prism support 151 via a belt 161. A second motor (not shown) is configured to rotate the prisms 142a, 142b, or 142c within the first prism support 141 via a belt 163.
Figure 14 presents a simplified view of the second coordinated effects system 1200 of Figure 12 in the first configuration. In the first configuration, the first prism support 141 and the second prism support 151 have been rotated from their positions in the second configuration shown in Figure 13 to insert both the prism 142c and the prism 152c into the light beam. In this first configuration, the prisms will interact to produce results similar to those shown in Figures 2, 3, 10, and 11.
Figure 14 shows a pulley 153 that is coupled to and driven by the first motor described with reference to Figure 13. The pulley 153 engages the belt 161 and causes the prisms 152a, 152b, or 152c to rotate within the second prism support 151.
Although embodiments with two prism systems have been illustrated and described, in other embodiments any number of prism systems may be utilized to produce complex coordinated effects. Each of the multiple prism systems may be fitted with any number of prisms.
Figure 15 presents a block diagram of a control system (or controller) 1500 for an automated luminaire 100 according to the disclosure. The control system 1500 is suitable for controlling the coordinated effects systems 400 and 1200 described with reference to Figures 4-8 and 12-14, respectively. The control system 1500 is also suitable for controlling other control functions of the automated luminaire 100, described with reference to Figure 9. The control system 1500 includes a processor 1502 electrically coupled to a memory 1504. The processor 1502 is implemented by hardware and software. The processor 1502 may be implemented as one or more Central Processing Unit (CPU) chips, cores (e.g., as a multi-core processor), field-programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), and digital signal processors (DSPs).
The processor 1502 is further electrically coupled to and in communication with a communication interface 1506. The communication interface 1506 is coupled to, and configured to communicate via, the data link 14. The processor 1502 is also coupled via a control interface 1508 to one or more other sensors, motors, actuators, controls and/or other devices. The processor 1502 is configured to receive control signals via the communication interface 1506 and to control the coordinated effects systems 400 and 1200 and other mechanisms of the automated luminaire 100 via the control interface 1508.
The control system 1500 is suitable for implementing processes, coordinated effects control, framing system control, and other functionality as disclosed herein, which may be implemented as instructions stored in the memory 1504 and executed by the processor 1502. The memory 1504 comprises one or more disks, tape drives, and/or solid-state drives and may be used as an overflow data storage device, to store programs when such programs are selected for execution, and to store instructions and data that are read during program execution. The memory 1504 may be volatile and/or non-volatile and may be read-only memory (ROM), random access memory (RAM), ternary content-addressable memory (TCAM), and/or static random-access memory (SRAM).
Conventional framing systems typically use four blades that may be moved independently into and out of the beam, allowing framing a projected image from a lighting fixture to common rectangular shapes, such as picture frames. Often, individual angular control for each blade is provided. Such a framing mechanism enables masking the final output beam to a desired shape by controlling its edges. The framing shutters are typically straight edged so that inserting them into the beam masks an area in a straight line. Motorized systems to both insert and remove and optionally rotate each flag or shutter are often very complex mechanically and add substantial weight and cost to a luminaire.
Figure 16 illustrates a barrel prism 160 for use in a framing system according to the disclosure. Barrel prism 160 comprises a substrate plane with a single semi-cylindrical prism 162 having a radius of curvature 164. Semi-cylindrical prism 162 may be of any diameter, here shown as partially covering the plane area, but in practice may cover the entire area or any proportion of the area. In other embodiments, the cross section of the single semi-cylindrical prism may be modified from a semi-cylinder--e.g., semi-paraboloid, semi-ellipse or other non-cylindrical shapes. In all such embodiments, the prism is a single convex shape with a constant cross section along its length.
Figure 17 illustrates the effect of a prior art ribbed or linear prism 172. The ribbed prism 172 comprises multiple parallel ribs or other convex shapes and is commonly used to spread the light in a single direction. As illustrated, a source image 170 produced by beam color, size, shape, and/or pattern optical systems passes through the ribbed prism 172, which may be axially rotated as indicated by arrow 174. The resulting output image 176 is an oval transformation of the source image 170. In particular, if the source image 170 is a circular aperture, then the resultant beam (output image) 176 will be elliptical in shape. This is useful as an effect, but is not useful as a soft edge shutter or framing system, as the sides of the beam are curved. The output image 176 rotates, as shown by arrow 178, as the ribbed prism 172 rotates.
Figure 18 illustrates the effect of a framing system according to the disclosure, using a barrel prism 182 of the type shown in Figure 16. The barrel prism 182 is suitable for use in any of prism systems 40 and 50 of the coordinated effects system 400 and prism systems 140 and 150 of the coordinated effects system 1200 described with reference to Figures 4-8 and 12-14, respectively. When used in such systems under the control of the control system 1500 in the automated luminaire 100, one or more such barrel prisms 182 provide a framing system according to the disclosure.
The barrel prism 182 comprises a single convex shape as described above. As illustrated, a source image 180 produced by beam color, size, shape, and/or pattern optical systems passes through the barrel prism 182, which may be axially rotated as indicated by arrow 184. A resultant output image 186 is a stretched transformation of the source image 180, with substantially linear edges. In particular if the source image 180 is a circular aperture, then the output image 186 will be approximately rectangular in shape. This provides a new and useful operational mode for the system as a framing system. The output image 186 will rotate, as shown by arrow 188, as the barrel prism 182 rotates.
A first dimension 185 of the output image 186 is determined primarily by a diameter of the source image 180. A second dimension 187 of the output image 186 is determined by the diameter of the source image 180 and additionally by a radius of curvature 164 of the barrel prism 182. As with lenses, a barrel prism 182 having a larger radius of curvature 164 will spread the source image 180 by a lesser amount, resulting in a smaller second dimension 187, while a barrel prism 182 having a smaller radius of curvature 164 will spread the source image 180 by a greater amount, resulting in a larger second dimension 187.
An overall projected size of the output image 186 may be adjusted by varying the zoom setting (focal length) of the optical system of the automated luminaire 100. Changing the size of the aperture producing the source image 180 will affect both the dimensions 185 and 187. Using a barrel prism 182 of greater or lesser radius of curvature 164 will make the second dimension 187 shorter or longer, respectively. One advantage of the single barrel prism over the prior art ribbed or linear prisms is the relatively straight edges of the resultant beam, which allows the use of output image 186 as a framing system, creating a generally rectangular output image 186 that may be rotated, if needed, to match the straight edges of set pieces, doorways, windows, or other targets. The corners of the output image 186 are curved, but that is unlikely to be troubling to a user of a framing system according to the disclosure. A homogenizing or frost filter of the automated luminaire 100 may be used to soften the edges of the output image 186. All of these parameters controlling characteristics of the projected output image 186 may be controlled by a user of the automated luminaire 100 via control signals sent to the control system 1500.
Figure 19 illustrates the effect of a framing system according to the disclosure, using two barrel prisms of the type shown in Figure 16. The luminaire 100 may be fitted with two barrel prisms that may be combined one after the other as described earlier for the coordinated effects systems 400 and 1200 described with reference to Figures 4-8 and 12-14, respectively. As described with reference to Figure 18, the first barrel prism 182 produces the output image 186 from the source image 180. The output image 186 is then a source image for a second barrel prism 192, which produces a resultant output image 196.
Because the barrel prism 192 is rotated to be oriented orthogonally to the barrel prism 182, it stretches the dimension 185 of the source image 186 to the larger dimension 195 of the output image 196. The second dimension 187 of the source image 186 remains substantially unchanged in the output image 196.
An overall projected size of the output image 196 may be adjusted by varying the zoom setting (focal length) of the optical system of the automated luminaire 100. Changing the size of the aperture producing the source image 180 will affect the dimensions of the source image 186 and the dimensions of the output image 196. Using a barrel prism 192 of greater or lesser radius of curvature 164 will make the dimension 195 shorter or longer, respectively.
Thus, by the selection of a size of the source image 180, the radii of curvature of the barrel prisms 182 and 192, the setting of the zoom optical system of the automated luminaire, and the use of a frost filter, the user of the automated luminaire 100 is enabled to produce an projected rectangular image having a wide range of size, aspect ratio, and edge softness. Furthermore, by rotating both barrel prisms while retaining their rotational orientation relative to each other, the projected rectangular image may be rotated to align with edges of set pieces, risers, or other targets in a performance space.
Conventional framing systems are complex mechanisms requiring numerous motors/actuators that add significant weight and/or cost to an automated luminaire. Such framing systems typically use as framing shutters thin metallic plates that warp or are otherwise damaged when used in a luminaire having a high beam intensity and/or a pronounced hot spot. A framing system according to the disclosure is less complex, uses fewer actuators, is lighter, less expensive, and is much more resistant to beam intensity and hot spot than conventional framing systems.
One or both of the barrel prisms of a framing system according to the disclosure may also be used as a coordinated effects system as described for the coordinated effects systems 400 and 1200 described with reference to Figures 4-8 and 12-14, respectively. In a first configuration, a barrel prism may be positioned in a light beam that has passed through a prism of another type. The barrel prism will spread the effect of the other prism in a similar way as described above for spreading a circular source image. In a second configuration, two barrel prisms may be positioned in the light beam and rotated relative to each other to produce an output image that changes shape from a first rectangle to a first rhomboid to a second rectangle to a second rhomboid, etc. In such a second configuration, the barrel prisms may be rotated in the same direction at differing speeds, one barrel prism may be rotated while the other barrel prism remains static (i.e., at a rotational speed of zero), or the barrel prisms may be rotated in opposite directions at the same or differing speeds
While the disclosure has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that other embodiments may be devised which do not depart from the scope of the disclosure herein. While the disclosure has been described in detail, it should be understood that various changes, substitutions and alterations can be made hereto without departing from the scope of the disclosure.

Claims

A framing system, comprising:
a first prism system (40, 140) comprising a plurality of barrel prisms (182), each having a radius of curvature different from the other barrel prisms in the plurality of barrel prisms, the first prism system configured to

receive a circular light beam (180),

position a selected one of the plurality of barrel prisms (182) in the circular light beam (180) passing through the first prism system (40, 140) to form a first rounded rectangular beam (186) having a first desired aspect ratio or to remove all of the plurality of barrel prisms (182) from the circular light beam passing through the first prism system (40, 140),

the first prism system further configured to rotate the selected one of plurality of barrel prisms to obtain a desired orientation of the first rounded rectangular beam; and

a second prism system (50, 150) comprising a second barrel prism (192), the second prism system (50, 150) configured to position the second barrel prism in the light beam passing through the first prism system to modify the light beam passing through the first prism system (40, 140) into a second rounded rectangular beam having a second desired aspect ratio or to remove the second barrel prism from the light beam passing through the first prism system, the second prism system further configured to rotate the second barrel prism (192) to obtain a desired orientation of the second rounded rectangular beam.
The framing system of claim 1, wherein:
the first prism system (40, 140) is configured to detect an orientation of the selected one of plurality of barrel prisms (182), positioned in the light beam passing through the first prism system; and

the second prism system (50, 150) is configured to detect an orientation of the second barrel prism (192) positioned in the light beam passing through the first prism system.
The framing system of claim 1, wherein:
the second prism system (50, 150) comprises a second plurality of barrel prisms, each having a radius of curvature different from the other barrel prisms in the second plurality of barrel prisms, the second prism system configured to position a selected one of the second plurality of barrel prisms in the light beam passing through the first prism system or to remove all of the second plurality of barrel prisms from the light beam passing through the first prism system.
The framing system of claim 3, wherein:
the first prism system (40, 140) comprises a sensor configured to detect an orientation of the selected one of the plurality of barrel prisms (182) positioned in the light beam passing through the first prism system; and

the second prism system (50, 150) comprises a sensor configured to detect an orientation of the selected one of the second plurality of barrel prisms positioned in the light beam passing through the first prism system.
The framing system of claim 3, wherein:
the first prism system (40, 140) comprises a first stepper motor (43) configured to position the selected one of the plurality of barrel prisms (182) in the light beam passing through the first prism system or to remove all of the plurality of barrel prisms from the light beam passing through the first prism system; and

the second prism system (50, 150) comprises a second stepper motor (53) configured to position the selected one of the second plurality of barrel prisms in the light beam passing through the first prism system or to remove all of the second plurality of barrel prisms from the light beam passing through the first prism system.
The framing system of claim 1, wherein:
the first prism system comprises a first stepper motor configured to rotate the barrel prisms (182) of the first prism system; and

the second prism system comprises a second stepper motor configured to rotate the second barrel prism (192).
The framing system of claim 1, wherein at least one of the first prism system and the second prism system comprises:
an arm (41, 51) on which is rotatably mounted the plurality of barrel prisms (182) of the first prism system or the second barrel prism (192); and

an actuator coupled to the arm, the actuator configured to rotate the arm to position the selected barrel prism (182) in the light beam passing through the first prism system or to remove the plurality of barrel prisms (182) from the light beam passing through the first prism system.
An automated luminaire (100), comprising:
a framing system (400) as claimed in claim 1, and further comprising:
a light source (132) configured to emit a light beam;

an optical device (134) optically coupled to the light source and configured to produce a circular light beam;

wherein the first prism system (40, 140 comprising the plurality of barrel prisms (182) is optically coupled to the optical device;

wherein the second prism system (50, 150) comprising the second barrel prism (192), is optically coupled to the first prism system; and

a control system (1500) configured to control the optical device, the first prism system, and the second prism system.
The automated luminaire of claim 8, wherein:
the automated luminaire further comprises an optical system optically coupled to the second prism system and configured to project a light beam passing through the second prism system onto a target in a performance space.
The automated luminaire of claim 8, wherein the control system is configured to:
detect a first orientation of a selected barrel prism of the plurality of barrel prisms (182) of the first prism system;

detect a second orientation of the second barrel prism (192); and

control rotation of the selected barrel prism of the plurality of barrel prisms (182) of the first prism system and rotation of the second barrel prism (192) based on the detected first and second orientations.
The automated luminaire of claim 10, wherein the control system is configured according to one of the following:
(i) wherein the control system (1500) is configured to rotate the selected one of the plurality of barrel prisms (182) of the first prism system to a first desired orientation and to rotate the second barrel prism (192) to a second desired orientation;

(ii) wherein the control system (1500) is configured to rotate the selected one of the plurality of barrel prisms (182) of the first prism system and the second barrel prism (192) while maintaining a desired rotational alignment between the selected one of the plurality of barrel prisms of the first prism system and the second barrel prism.
The automated luminaire of claim 8, wherein the control system is configured according to one of the following;
(i) wherein the control system (1500) is configured to rotate the selected one of the barrel prisms (182) of the first prism system and the second barrel prism (192) at differing rotational speeds;

(ii) wherein the control system (1500) is configured to rotate the selected one of the barrel prisms (182) of the first prism at a first speed and the second barrel prism at a second speed.
The automated luminaire of claim 8, wherein the control system comprises a communication interface (1506) and the control system (1500) is configured to control the first prism system and the second prism system in response to control signals received via the communication interface.
A method for shaping a light beam projected by an automated luminaire (100) as claimed in any of claims 8 to 13, comprising:
forming a circular light beam;
modifying the circular light beam with a selected barrel prism of the plurality of barrel prisms (182) of the first prism system to form a rounded rectangular beam having a desired aspect ratio;

rotating the selected barrel prism (192) to obtain a desired orientation of the rounded rectangular beam; and

projecting the rotated rounded rectangular beam from an automated luminaire onto a target in a performance space.
The method of claim 14, wherein the selected barrel prism is a first selected barrel prism of the plurality of barrel prisms of the first prism system and the rounded rectangular beam is a first rounded rectangular beam, the method further comprising:
modifying the first rounded rectangular beam with a second selected barrel prism to form a second rounded rectangular beam having a desired aspect ratio, the first and second selected barrel prisms having an orthogonal orientation relative to each other;

rotating the first and second selected barrel prisms to obtain a desired orientation of the second rounded rectangular beam while maintaining the orthogonal orientation between the first and second selected barrel prisms; and

projecting the second rotated rounded rectangular beam from the automated luminaire onto the target in the performance space.
The method of claim 14, further comprising changing a size of the projected rotated rounded rectangular beam by changing a size of the circular light beam or by adjusting a configuration of a zoom optical system of the automated luminaire.