Illumination assembly including a microlens array

Abstract

An illumination system incorporating an LED with a microlens array is provided. [Solution] The lighting system includes an LED array including a plurality of first LEDs and a plurality of second LEDs. The microlens array overlies the plurality of LEDs and includes a plurality of first lenses corresponding to the plurality of first LEDs and a plurality of second lenses corresponding to the plurality of second LEDs. A first geometric shape of at least one of the plurality of first lenses is different from a second geometric shape of at least one of the plurality of second lenses. The imaging device is configured to capture an image based on light reflected from the LED array. At least one processing device is in communication with the LED array and the imaging device. The at least one processing device is configured to identify a shadow cast on a target area by an obstacle and selectively activate the LED array based on the shadow.

Description

[Technical Field]

[0001] The present disclosure relates generally to lighting assemblies having microlens arrays, and more particularly to surgical lighting instruments incorporating LEDs with microlens arrays. Summary of the Invention [Means for solving the problem]

[0002] According to one aspect of the present disclosure, an illumination system includes an array of light-emitting diodes (LEDs) including a plurality of first light-emitting diodes and a plurality of second light-emitting diodes. A microlens array overlies the plurality of first and second light-emitting diodes and includes a plurality of first lenses corresponding to the plurality of first light-emitting diodes and a plurality of second lenses corresponding to the plurality of second light-emitting diodes. A first geometric shape of at least one of the plurality of first lenses is different from a second geometric shape of at least one of the plurality of second lenses. An imaging device is configured to capture an image based on light reflected from a target area from the plurality of first light-emitting diodes. At least one processing device is in communication with the light-emitting diode array and the imaging device. The at least one processing device is configured to identify shadows cast on the target area by obstacles and selectively activate the plurality of second light-emitting diodes from an unobstructed angle.

[0003] According to another aspect of the present disclosure, an illumination system includes an array of light-emitting diodes (LEDs) including a plurality of first light-emitting diodes and a plurality of second light-emitting diodes. A microlens array overlies the plurality of first and second light-emitting diodes and includes a plurality of first lenses corresponding to the plurality of first light-emitting diodes and a plurality of second lenses corresponding to the plurality of second light-emitting diodes. A first geometric shape of the plurality of first lenses corresponds to a first illumination angle, and a second geometric shape of the plurality of second lenses corresponds to a second illumination angle different from the first illumination angle. A control system is in communication with the light-emitting diode array and is configured to selectively activate the plurality of second light-emitting diodes and the plurality of second light-emitting diodes to illuminate a target area from an unobstructed angle.

[0004] According to yet another aspect of the present disclosure, an illumination system includes an array of light-emitting diodes (LEDs) including a plurality of first light-emitting diodes and a plurality of second light-emitting diodes. A microlens array overlies the plurality of first and second light-emitting diodes and includes a plurality of first lenses corresponding to the plurality of first light-emitting diodes and a plurality of second lenses corresponding to the plurality of second light-emitting diodes. A first geometric shape of the plurality of first lenses corresponds to a first illumination angle, and a second geometric shape of the plurality of second lenses corresponds to a second illumination angle different from the first illumination angle. A control system is configured to selectively operate the light-emitting diode array to obtain at least one of the first illumination angle or the second illumination angle while the light-emitting diode array and the microlens array are statically positioned.

[0005] These and other features, advantages, and objects of the present device will be further understood and appreciated by those skilled in the art from a review of the following specification, claims, and accompanying drawings. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a side view of an exemplary medical environment incorporating a lighting system of the present disclosure. [Figure 2]2 is a front plan view based on FIG. 1 of a lighting assembly according to one embodiment of the present disclosure. [Figure 3] 1 is a partial cross-sectional view of a cross section of a lighting assembly according to one embodiment of the present disclosure. [Figure 4A] 1 is a perspective view of a first mode of operation of an illumination system illuminating a first region and a second region in a spaced apart relationship according to one embodiment of the present disclosure. FIG. [Figure 4B] FIG. 10 is a perspective view of a second mode of operation of the lighting system, illuminating a first region and a second region in an overlapping relationship, according to one embodiment of the present disclosure. [Figure 4C] FIG. 10 is a perspective view of a third mode of operation of the illumination system, illuminating a first region and a second region at different depths, according to one embodiment of the present disclosure. [Figure 4D] FIG. 10 is a perspective view of a fourth mode of operation of an illumination system for illuminating a first area and a second area to reduce shadows cast on a target area, according to one embodiment of the present disclosure. [Figure 5] FIG. 1 is a block diagram of a lighting system according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0007] The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles described herein.

[0008] The illustrated embodiments pertain primarily to a combination of apparatus components related to an illumination assembly including a microlens array. Accordingly, apparatus components and method steps have been presented, where appropriate, by conventional symbols in the drawings, showing only specific details relevant to understanding the embodiments of the present disclosure, so as not to obscure the disclosure with details that will be readily apparent to those skilled in the art having the benefit of the descriptions herein. Furthermore, like numerals in the specification and drawings represent like elements.

[0009] For purposes of description herein, terms such as “upper,” “lower,” “right,” “left,” “rear,” “front,” “vertical,” and “horizontal,” and variations thereof, shall refer to the lighting assembly as oriented in FIG. 1 . Unless otherwise specified, the term “front” shall refer to the surface of an element that is closer to the target area of ​​the lighting assembly, and the term “rear” shall refer to the surface of an element that is further from the target area of ​​the lighting assembly. However, it should be understood that the lighting assembly can assume various alternative orientations, unless expressly specified to the contrary. It should also be understood that the specific devices and processes illustrated in the accompanying drawings and described in the following specification are merely exemplary embodiments of the inventive concepts defined in the appended claims. Accordingly, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered limiting, unless the claims expressly state otherwise.

[0010] The terms "including," "comprises," "comprising," or other variations thereof are intended to cover a non-exclusive inclusion, and a process, method, article, or apparatus that comprises listed elements does not include only those elements, but may include other elements that are not expressly listed or that are inherent to such process, method, article, or apparatus. An element preceded by "comprising" does not, without further constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0011] 1-5, the illumination system 10 includes an array 12 of light-emitting diodes (LEDs) 14 including a plurality of first LEDs 16 and a plurality of second LEDs 18 (FIG. 2). A microlens array 20 overlies the plurality of first and second LEDs 16, 18 and includes a plurality of first lenses corresponding to the plurality of first LEDs 16 and a plurality of second lenses corresponding to the plurality of second LEDs 18 (FIGS. 4A-4D). A first geometry (e.g., focal point) of at least one of the plurality of first lenses is different from a second geometry (e.g., focal point) of at least one of the plurality of second lenses. An imaging device 22 is configured to capture an image including light reflected from a target area by illumination from the plurality of first LEDs 16. A control system includes at least one processing device 24, 26 (FIG. 5) in communication with the array 12 of LEDs 14 and the imaging device 22. The at least one processing unit 24, 26 is configured to identify a shadow 28 obscuring the target area and selectively activate the plurality of second LEDs 18 from an unobstructed angle.

[0012] Referring now more particularly to FIG. 1 , the present lighting system 10 may be used in a medical environment 30, such as a surgical operating room. The medical environment 30 may include an operating table 32 for supporting a patient thereon and may further include one or more structures 34, 36 incorporating at least one lighting fixture 38 for illuminating the medical environment 30. The one or more structures 34, 36 may include a ceiling 34 of the medical environment 30, another wall of the medical environment 30, and / or a mobile boom 36. The mobile boom 36 may be coupled to the operating table 32, spaced apart from the operating table 32, and / or incorporate a base having a rolling element to facilitate movement of the lighting fixture 38 relative to the medical environment 30. As illustratively shown, the lighting system 10 of the present disclosure is incorporated into both the ceiling lighting fixture 40 and the lighting fixture 42 on the boom 36. It is contemplated that the expanded capabilities provided by the present lighting system 10 may be achieved through the incorporation of either the boom 36 and / or the ceiling 34, although different lighting patterns may be achieved depending on the particular implementation, as described further herein. In some embodiments, the control system (e.g., at least one processing unit 24, 26) may be combined with a user interface 37 that includes multiple inputs for manually performing the functions and steps described herein.

[0013] With continued reference to FIG. 1 , the imaging device 22 can be disposed on or within one or more structures 34, 36 and / or lighting fixtures 38 to monitor the healthcare environment 30. One or more imaging devices 22 can be included. For example, one or more imaging devices 22 can be communicatively coupled to and / or disposed on the lighting fixtures 38, the boom 36, and / or elsewhere within the healthcare environment 30. In some embodiments, one of the imaging devices 22 can be disposed on a wearable structure, such as the headband 43 shown in FIG. 1 . In some embodiments, the array 12 can be disposed on a wearable structure on the same or a different structure as the imaging device 22. In some embodiments, a wand 45 can be utilized to direct the illumination. More specifically, the wand 45, as shown in FIG. 1 , can be used to control lighting modes using HMI input (e.g., buttons), pointing, aiming, moving, projecting a light pattern recognizable by a control system (e.g., at least one processing unit 24, 26) onto a target surface, and / or combinations thereof. The wand 45 may be wired or wirelessly connected to a control system (eg, at least one processing unit 24 , 26 ) and / or otherwise recognizable in images captured by the imaging device 22 .

[0014] 5, each of the imaging devices 22 (e.g., cameras, imagers, and / or video capture devices) may be configured to capture images of a healthcare professional and / or target area within the healthcare environment 30. The images may then be processed by at least one processing device 24, 26. The array 12 of LEDs 14 may then be controlled based on the captured images to improve the lighting conditions within the healthcare environment 30. While the lighting system 10 is shown within the healthcare environment 30, it should be understood that the lighting system 10 may be used in any environment where dynamic illumination of a target area is beneficial.

[0015] Referring now to FIG. 2, a lighting fixture 38 is illustratively shown in combination with the boom 36 described above with respect to FIG. 1. The array 12 of LEDs 14 can be densely arranged to provide enhanced light output and allow control of the particular light pattern projected from the lighting assembly 38. For example, the array 12 of LEDs 14 can be arranged in a hexagonal pattern, a square pattern, a linear offset pattern (as shown), rows and / or columns, one or more concentric circles, or any other geometric shape that allows the LEDs 14 to be spaced closely together. For example, a distributed arrangement of the array 12 of LEDs 14 can allow for a spacing between adjacent LEDs 14 of between about 1 mm and 5 mm, or less. In some examples, the spacing between any two adjacent LEDs 14 in the array 12 of LEDs 14 can be less than 1 mm (e.g., 0.1 mm to 0.9 mm). Overlaying the array 12 of LEDs 14 is a microlens array 20, which can be substantially transparent and is further described below with reference to FIGS. 3 through 4D. The microlens array 20 is in optical communication with the array 12 of LEDs 14 and is adapted to direct light emitted from the LEDs 14 in a particular manner determined by the shape of the microlens array 20 .

[0016] Referring now to FIG. 3 , a region of the array 12 of LEDs 14 may have a set of four emitters 44, 46, 48, 50 (i.e., individual LEDs), including a first emitter 44, a second emitter 46, a third emitter 48, and a fourth emitter 50. As shown, the microlens array 20 may include an inner layer 52 and an outer layer 54 overlying the array 12 of LEDs 14 (e.g., emitters 44, 46, 48, 50). The outer layer 54 may be applied to the inner layer 52 to provide a smooth texture to the outer surface “S” of the microlens array 20, while the inner layer 52 may form various lens structures / shapes for some or all of the individual LEDs 14 (e.g., emitters 44, 46, 48, 50). In some examples, the outer layer 54 is omitted, and the outer surface S is formed by the inner layer 52. The outer surface S may be flat, smooth, convex, concave, and / or have other topographies. In this example, the portion of the microlens array 20 forming the geometric shape of the lenses defines a single unitary body extending across at least a portion (e.g., two or more, or each) of the plurality of emitters 44, 46, 48, 50 of the array 12.

[0017] 3 , the array 12 of emitters 44, 46, 48, 50 can be disposed on a common substrate 55, such as a printed circuit board, that includes electronics configured to control the electrical properties of the emitters 44, 46, 48, 50. The common substrate 55 can be planar, convex, concave, or other shape to optimally position the array 12 of LEDs 14. For example, the substrate 55 can include electrode traces between the anode and cathode of each emitter 44, 46, 48, 50, which are communicatively coupled to the lighting controller 24, as further described in connection with FIG. 5 . As shown, the substantially transparent inner layer 52 of the microlens array 20 can define a plurality of lenses 56 having different shapes. Illustratively, four different geometric shapes of the plurality of lenses 56 are shown. For example, the plurality of lenses 56 may include a first lens 57 disposed over the first emitter 44 defining a first geometry configured to distribute light emitted from the first emitter 44 in a first distribution 58. The first geometry may include a relatively wide radius of curvature, such that the first distribution 58 has a divergence angle of approximately 30° to 45° from a central axis through the first lens 57. The plurality of lenses may include a second lens 60 disposed over the second emitter 46 defining a second geometry configured to distribute light emitted from the second emitter 46 in a second distribution 62. The second distribution 62 may be significantly narrower than the first distribution 58. For example, the second geometry of the second lens 60 may result in the concentration of light emitted from the second emitter 46 at a particular focal point. In this manner, the light emitted from the second emitter 46 can provide a first converging light pattern, while the light emitted from the first emitter 44 can provide a first diverging light pattern.

[0018] 3 , the plurality of lenses 56 may include a third lens 64 disposed over the third emitter 48 defining a third geometry configured to generate a third distribution of light 66 (e.g., a second diverging light pattern) with a divergence angle greater than the divergence angle of the first lens 57. For example, the low height and wide elongated geometry of the third lens 64 relative to the third emitter 48 may enable a divergence angle ranging from 40° to 60° from a central axis through the third lens 64. The plurality of lenses 56 may further include a fourth lens 68 disposed over the fourth emitter 50 and configured to concentrate light emitted from the fourth emitter 50 into a fourth distribution 70. The fourth distribution may have a second converging light pattern with a longer focal length (e.g., a smaller magnitude of convergence) than the first converging light pattern. For example, the geometry of the fourth lens 68 (eg, the relatively large and relatively flat top surface of the lens 68) can direct the second light beam to have a focal length of, for example, several feet.

[0019] The differences between the second and fourth lenses 60, 68 can enable different operating principles depending on the location of the lighting assembly 38 relative to a target area within the medical environment 30. For example, if the lighting system 10 is integrated into a boom 36 due to its proximity to a surgical table 32 or other target area, the second emitter 46 may be selectively activated more frequently than the fourth emitter 50. Similarly, if the lighting system 10 is integrated into, for example, a ceiling luminaire 40, the fourth emitter 50 may be selectively activated more regularly due to a targeted lighting technique. In this manner, the lighting system 10 can enable dynamic lighting configurations for various positions or locations of the lighting system 10. In some embodiments, the focal length of the second distribution 62 (e.g., the first convergent light pattern) can be approximately 1:2, approximately 1:3, approximately 1:4, or approximately 1:5 of the focal length of the fourth distribution 70 (e.g., the second convergent light pattern).

[0020] The multiple lenses 56 described above are exemplary and non-limiting, and it is contemplated that any combination or arrangement of different lenses may be incorporated along any region of the array 12 of LEDs 14. For example, the outer regions of the array 12 of LEDs 14 may incorporate a wide-angle diverging light pattern (e.g., using the first and / or third emitters 44, 48), while the inner portions of the luminaire 38 may incorporate a converging light pattern (e.g., using the second and / or fourth emitters 46, 50), or vice versa. As described with reference to Figures 4A-4D, the arrangement of the microlens array 20 may be implemented to enable various operating modes, particularly from near-field or far-field applications (e.g., mounted on a boom 36 or mounted on a ceiling 34), thus enabling dynamic operation of the lighting system 10 to optimize user perception. Thus, the converging and diverging light patterns illustratively illustrated in FIG. 3 may be mixed or areally packed across part or all of the array 12 of LEDs 14 .

[0021] 4A-4D , four exemplary operational modes are shown, demonstrating the flexibility of the lighting system 10. The illustrated operational modes are described with reference to a plurality of first LEDs 16 and a plurality of second LEDs 18. For example, for a given operational mode, the plurality of first LEDs 16 can be operated to illuminate a first region 72, and the plurality of second LEDs 18 can be operated to illuminate a second region 74 that is different from the first region 72. The first and second regions 72, 74 may differ in size (e.g., area), focal length, intensity, position, or directionality.

[0022] 4A in more detail, the lighting system 10 may be configured to operate the array 12 of LEDs 14 in a first mode of operation 76 to change the directionality of light emitted from the lighting fixture 38. For example, the first plurality of LEDs 16 may be activated by the lighting controller 24 ( FIG. 5 ) to illuminate a first region 72, and the second plurality of LEDs 18 may be activated by the lighting controller 24 to illuminate a second region 74 spaced apart from the first region 72. In this example, the first and second regions 72, 74 may not be aligned with a central portion of the lighting fixture 38. As shown, the first and second regions 72, 74 may be aligned with opposite outer portions of the lighting fixture 38. However, it should be understood that the first and second regions 72, 74 in the first mode of operation 76 may be spaced further laterally apart from one another than is explicitly shown, such that the first and second regions 72, 74 are disposed beyond the outer portions of the lighting fixture 38.

[0023] 4B , a second operational mode 78 of the illumination system 10 is shown, which demonstrates the use of the microlens array 20 and the array 12 of LEDs 14 to selectively overlap regions 72, 74 by activating two or more of the converging and / or diverging light patterns. For example, the illumination controller 24 may activate a plurality of first LEDs 16 to illuminate a first region 72 and a plurality of second LEDs 18 to illuminate a second region 74, the second region 74 being generally aligned with the first region 72 but having a larger radius over the target area. For example, the plurality of second LEDs 18 may incorporate a wider diverging light pattern (e.g., first and / or third lenses 57, 64) that is activated by the lighting controller 24 to illuminate the second region 74, and the first region 72 may be selectively illuminated by incorporating a narrower converging light pattern (e.g., second and / or fourth lenses 60, 68) to generate the first region 72.

[0024] 4C , the lighting system 10 can operate in a third mode of operation 80, in which the first region 72 corresponds to an area illuminated from the array 12 of LEDs 14 at a first focal length 82, and the second region 74 corresponds to an area illuminated from the array 12 of LEDs 14 at a second focal length 84. In this manner, the first focal length 82 is shorter than the second focal length 84, allowing the lighting system 10 to selectively illuminate different objects or objects having two or more surfaces at different distances from the lighting fixture 38. The plurality of first LEDs 16 and the plurality of second LEDs 18 can operate simultaneously and in combination in the first mode of operation 76, and are intended to illuminate areas not directly beneath the lighting fixture 38. To achieve the different focal lengths, the plurality of first LEDs 16 can include one or more of the second emitters 46 described above incorporating a first converging light pattern (e.g., a second lens 60) that defines the first focal length. Similarly, the plurality of second LEDs 18 may include one or more fourth emitters 50 incorporating a second converging light pattern (e.g., a fourth lens 68) that defines a second focal length.

[0025] 4D , a fourth operating mode 86 of the lighting system 10 can include a shadow mitigation function. In the fourth operating mode 86, when an obstruction 88 is detected between the first region 72 and the plurality of first LEDs 16, the lighting system 10 can activate the plurality of second LEDs 18 to illuminate the first region 72 from an unobstructed angle. Thus, in this example, the first and second regions 72, 74 can substantially overlap on the same target area. As further described with respect to FIG. 5 , the one or more imaging devices 22 can be configured to capture an image of the obstruction 88, process the image to detect the obstruction 88 (e.g., presence, shape, and / or location), and control or otherwise communicate instructions for controlling the array 12 of LEDs 14 in response to detecting the obstruction 88.

[0026] 4A-4D , it is contemplated that the exemplary operational modes described with respect to FIGS. 4A-4D may be combined with one another and / or incorporate other exemplary operational modes not described in detail herein. For example, any one of the above-described operational modes may be automatically activated based on images captured by one or more image capture devices 22. Accordingly, directivity changes, spot size changes, focal length changes, and shadow mitigation functions may be incorporated into algorithms executed by illumination controller 24 and / or image processor 26 in communication with illumination controller 24 (see FIG. 5 ). For example, an operational mode may incorporate one or more of a first converging light pattern, a second converging light pattern, a first diverging light pattern, and / or a second diverging light pattern associated with lenses 57, 60, 64, and 68. Furthermore, it should be understood that microlens array 20 may incorporate many lenses having various shapes to achieve multiple converging light patterns (i.e., three or more) and / or diverging light patterns (i.e., three or more). Additionally, it should be appreciated that the microlens array 20 can further vary the angle of the light pattern such that the light pattern central axis through a converging, diverging, or otherwise non-angled shape defines an overall transmission orientation. For example, the light pattern central axis can converge at a preset distance such that the overall transmission orientation is at least partially parabolic. In some examples, the microlens array can be configured such that the first plurality of LEDs 16 have a converging overall transmission orientation and the second plurality of LEDs 18 have a diverging overall transmission orientation. In other examples, the microlens array can be configured such that the first plurality of LEDs 16 have a diverging overall transmission orientation and the second plurality of LEDs 18 have a converging overall transmission orientation. In some embodiments, the first plurality of LEDs 16 are arranged around the second plurality of LEDs 18 (e.g., concentrically). In further embodiments, the first plurality of LEDs 16 can have multiple lens combinations facilitating various degrees of convergence, divergence, and transmission orientation.Similarly, the plurality of second LEDs 18 can have multiple lens combinations that facilitate various degrees of convergence, divergence, and transmission orientation. In this manner, in a single embodiment, select groups of the first and / or second LEDs 16, 18 can be powered to achieve the various modes of operation described herein. Thus, while the first and second LEDs 16, 18 are provided by way of example, it should be understood that many groups of LEDs can be implemented to enable the various modes of operation as described herein to provide illumination at multiple illumination angles (e.g., convergence and divergence).

[0027] Referring now to FIG. 5 , the lighting controller 24 and image processor 26, described above, are shown in communication with one another. For example, during operation, images captured via one or more image capture devices 22 may be processed by the image processor 26 to identify body language, movement, and the like. The image processor 26 may then compare these identified features to historical image data, which includes similar image data associated with executable instructions. For example, the historical data may be stored in a database or memory 90, which may be remote or local to the lighting fixture 38 and configured to store target image data corresponding to various target lighting conditions. Additionally, the database or memory 90 may include shadow recognition software, including a dictionary of pre-stored predictive hand gesture models, obstacles, shadows, and instructions for triangulating the location of obstacles based on the position of the image capture device 22. The memory 90 may comprise a single disk or multiple disks (e.g., hard drives) and may include a storage management module for managing one or more partitions within the memory 90. In some embodiments, the memory 90 may include flash memory, semiconductor (solid-state) memory, or the like. The memory 90 may include random access memory (RAM), read-only memory (ROM), electrically erasable read-only memory (EEPROM), or a combination thereof. The memory 90 may include instructions that, when executed by at least one processing device (e.g., lighting controller 24 and / or processor 26), cause the processing device to perform at least functions associated with the components of the lighting system 10. For example, if images captured by one or more imaging devices 22 include the surgeon pointing in a particular direction or toward a particular area of ​​the operating table 32 or the patient, the image processor 26 may identify pointing body movements from the images and compare the pointing movements to previously captured pointing movements (e.g., or other profile data) to determine that the lighting fixture 38 should direct light toward the area pointed at by the surgeon.In response to determining a target area (e.g., the first or second areas 72, 74 described above), the image processor 26 can communicate instructions to the lighting controller 24 to selectively activate and / or deactivate one or more of the LEDs 14 in the array 12 of LEDs 14 so that the target area is illuminated in a particular manner. The lighting controller 24 can optionally communicate with one or more actuators 92 based on images captured by the one or more imaging devices 22, which are configured to mechanically adjust the position of the lighting fixtures 38 (e.g., by mechanisms coupled to the boom 36, other locations in the medical environment 30, or areas of the array 12 of LEDs) to provide enhanced lighting conditions. The imaging devices 22 can include one or more cameras operating in one or both of the visible and infrared spectrums. In some embodiments, the imaging devices 22 (i.e., and instructions contained in the memory 90) can be configured to determine the location of features (e.g., target areas, users, obstacles, and / or the like) in three-dimensional (3D) space. For example, the imager 22 may be configured to operate based on principles such as stereoscopic, time-of-flight (ToF), LiDAR, ultra-wideband (UWB), etc. Based on any of the above principles, the control system (e.g., at least one processing unit 24, 26) may be configured to extrapolate relative positions in 3D space (e.g., between the LEDs, imager 22, target area, and obstacles) by triangulation and determine which illumination mode to implement to optimally avoid the obstacle.

[0028] The above examples are merely illustrative, and it is contemplated that the lighting controller 24 may be configured to control the LEDs 14 and / or the plurality of actuators 92 in response to the image processor 26 detecting body language and / or movements by a user of the lighting system 10. For example, the image processor 26 may be configured to determine a stressed or sub-optimal ergonomic position of the surgeon based on images captured by the one or more imaging devices 22 and transmit commands to the lighting controller 24 to control the array 12 of LEDs 14 to direct light in an optimal target direction.

[0029] In one embodiment, such as the mode of operation shown in FIG. 4D , at least one processor 24, 26 is configured to determine the identity of the LED 14 (or region of LEDs) causing the shadow 28, deactivate the LED 14 causing the shadow 28 to limit the shadow 28, and activate other LEDs 14 to illuminate the portion of the target area obstructed by the shadow 28.

[0030] In some embodiments, the actuator 92 is omitted from the lighting fixture 38, and directional guidance is provided solely by control of the LEDs 14. Thus, in some embodiments, the lighting fixture 38 may not use an actuator 92 to adjust the position of the lighting fixture 38. In other words, light transmission may be configured to be controlled while the lighting fixture 38 is statically positioned. Additionally, while shown as two separate processing devices 24, 26, it is contemplated that the image processor 26 and the lighting controller 24 may be incorporated into a single control device, and that one or more image capture devices 22 may also be incorporated into the lighting fixture 38. Accordingly, the lighting system 10 of the present disclosure may be a stand-alone system or may be configured to be retrofitted into the architecture of a medical environment 30 (e.g., an operating room) that may already include one or more image capture devices 22 and / or image processor 26. In this example, the lighting fixture 38 may include a communications module operably coupled to the lighting controller 24, which initiates communication with an image processor 26 pre-installed in the medical environment 30 and enables the pre-installed image processor 26 to communicate with the lighting controller 24 via wired or wireless communications.

[0031] In general, the incorporation of the microlens array 20 can provide dynamic options for the lighting assembly described above. In particular, the microlens array 20 can require little intervention by the user of the lighting fixture 38 and allow for limited manual operation of the lighting fixture 38. Each LED 14 or region of the array 12 of LED microlens arrays can have a unique angle, intensity, and / or color (i.e., wavelength). Additionally or alternatively, the microlens assembly 20 can converge, diverge, and / or otherwise redirect light from individual ones of the LEDs 14 or regions of the array 12 of LEDs 14. In this manner, the LEDs 14 can be individually addressable and can each be activated or deactivated to achieve desired illumination.

[0032] The disclosure of this specification is further summarized in the following paragraphs and may be further characterized by any and all combinations of the various aspects described therein.

[0033] According to one aspect of the present disclosure, an illumination system includes an array of light-emitting diodes (LEDs) including a plurality of first light-emitting diodes and a plurality of second light-emitting diodes. A microlens array overlies the plurality of first and second light-emitting diodes and includes a plurality of first lenses corresponding to the plurality of first light-emitting diodes and a plurality of second lenses corresponding to the plurality of second light-emitting diodes. A first geometric shape of at least one of the plurality of first lenses is different from a second geometric shape of at least one of the plurality of second lenses. An imaging device is configured to capture an image based on light reflected from a target area from the plurality of first light-emitting diodes. At least one processing device is in communication with the light-emitting diode array and the imaging device. The at least one processing device is configured to identify shadows cast on the target area by obstacles and selectively activate the plurality of second light-emitting diodes from an unobstructed angle.

[0034] According to another aspect, the at least one processing device is further configured to determine that the plurality of first light-emitting diodes are causing a shadow in the target area, deactivate the plurality of first light-emitting diodes to limit the shadow, and activate the plurality of second light-emitting diodes to illuminate the target area.

[0035] According to yet another aspect, the microlens array is an integrally formed layer overlying the light emitting diode array.

[0036] According to yet another aspect, the at least one processing device is configured to selectively activate the plurality of second light emitting diodes to illuminate the target area from an unobstructed angle while the light emitting diode array is statically positioned.

[0037] According to another aspect, the lighting system includes one or more actuators for adjusting a position of at least one of the plurality of first light emitting diodes or the plurality of second light emitting diodes.

[0038] According to yet another aspect, the plurality of first light emitting diodes are arranged in a first concentric circular pattern, and the plurality of second light emitting diodes are arranged in a second concentric circular pattern.

[0039] According to yet another aspect, the memory includes instructions that, when executed by the at least one processing device, cause the at least one processing device to recognize a hand gesture in the image and selectively illuminate or extinguish at least one of the plurality of first light-emitting diodes or the plurality of second light-emitting diodes.

[0040] According to another aspect, the memory includes instructions that, when executed by the at least one processing device, cause the at least one processing device to recognize a hand gesture in the image and adjust, with one or more actuators, a position of at least one of the plurality of first light-emitting diodes or the plurality of second light-emitting diodes.

[0041] According to yet another aspect, a ceiling luminaire includes a lighting system.

[0042] According to yet another aspect, the light emitting diode array is disposed on a mobile boom.

[0043] According to another aspect, the light emitting diode array and the imager are disposed on a common structure.

[0044] According to yet another aspect, one of the first and second geometries corresponds to distributing light at a predetermined divergence angle, and the other of the first and second geometries corresponds to distributing light at a predetermined convergence angle.

[0045] According to yet another aspect, the first geometry corresponds to distributing light at a first divergence angle and the second geometry corresponds to distributing light at a second divergence angle different from the first divergence angle.

[0046] According to another aspect, the first geometry corresponds to distributing light at a first convergence angle and the second geometry corresponds to distributing light at a second convergence angle different from the first convergence angle.

[0047] According to another aspect of the present disclosure, an illumination system includes an array of light-emitting diodes (LEDs) including a plurality of first light-emitting diodes and a plurality of second light-emitting diodes. A microlens array overlies the plurality of first and second light-emitting diodes and includes a plurality of first lenses corresponding to the plurality of first light-emitting diodes and a plurality of second lenses corresponding to the plurality of second light-emitting diodes. A first geometric shape of the plurality of first lenses corresponds to a first illumination angle, and a second geometric shape of the plurality of second lenses corresponds to a second illumination angle different from the first illumination angle. A control system is in communication with the light-emitting diode array and is configured to selectively activate the plurality of second light-emitting diodes and the plurality of second light-emitting diodes to illuminate a target area from an unobstructed angle.

[0048] According to another aspect, one of the first and second geometries corresponds to distributing light at a predetermined divergence angle, and the other of the first and second geometries corresponds to distributing light at a predetermined convergence angle.

[0049] According to yet another aspect, the first geometry corresponds to distributing light at a first divergence angle and the second geometry corresponds to distributing light at a second divergence angle different from the first divergence angle.

[0050] According to yet another aspect, the first geometry corresponds to distributing light at a first convergence angle and the second geometry corresponds to distributing light at a second convergence angle different from the first convergence angle.

[0051] According to yet another aspect of the present disclosure, an illumination system includes an array of light-emitting diodes (LEDs) including a plurality of first light-emitting diodes and a plurality of second light-emitting diodes. A microlens array overlies the plurality of first and second light-emitting diodes and includes a plurality of first lenses corresponding to the plurality of first light-emitting diodes and a plurality of second lenses corresponding to the plurality of second light-emitting diodes. A first geometric shape of the plurality of first lenses corresponds to a first illumination angle, and a second geometric shape of the plurality of second lenses corresponds to a second illumination angle different from the first illumination angle. A control system is configured to selectively operate the light-emitting diode array to obtain at least one of the first illumination angle or the second illumination angle while the light-emitting diode array and the microlens array are statically positioned.

[0052] According to another aspect, the at least one processing device is further configured to determine the presence of an obstruction between the plurality of first light-emitting diodes and the target area, deactivate the plurality of first light-emitting diodes, and activate the plurality of second light-emitting diodes to illuminate the target area.

[0053] According to yet another aspect of the present disclosure, a lighting system for a healthcare environment is configured to provide dynamic and adaptive adjustments to mitigate poor ergonomic positioning, shadow obstructions, and other suboptimal conditions for targeted illumination. The lighting system can incorporate an array of LEDs, each with a microlens overlay configured to direct light from the LED at a specific angle, focal length, light distribution, or other lighting characteristic. The LEDs can be individually addressable to achieve desired lighting characteristics. An imaging system can capture and process images of the healthcare environment to detect undesirable positions or conditions, such as healthcare worker tension and / or shadows over a patient, tool, surgical area, or other target area within the healthcare environment. Generally, the microlens array can enable the lighting system to have various lighting modes that can be selectively adjusted by manual input or automatically by a controller for the lighting system.

[0054] Those skilled in the art will appreciate that the structure of the disclosure and other components described herein are not limited to any particular materials. Other exemplary embodiments of the disclosure disclosed herein may be formed from a wide variety of materials unless otherwise described herein.

[0055] For purposes of this disclosure, the term "coupled" (including all its forms, such as couple, coupling, and connected) generally means that two components are directly or indirectly coupled (electrically or mechanically) to one another. Such coupling can be fixed in nature or movable. Such coupling can be achieved by using the two components (electrically or mechanically) and some additional intermediate member integrally formed with each other or with the two components as a single, inseparable body. Such coupling can be permanent in nature or removable or releasable in nature, unless otherwise specified.

[0056] It is also important to note that the structure and arrangement of elements of the present disclosure as shown in the exemplary embodiments are merely illustrative. While this disclosure describes in detail only a few embodiments of the present innovation, those skilled in the art who review this disclosure will readily recognize that many modifications are possible (e.g., variations in the size, dimensions, structure, shape, and proportions of various elements, parameter values, mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the described subject matter. For example, elements shown as integrally formed can be composed of multiple pieces, or elements shown as multiple pieces can be integrally formed, interface operation can be reversed or otherwise changed, the structure and / or length or width of members, connectors, or other elements of the system can be changed, and the nature or number of adjustment points provided between elements can be varied. It should be noted that the elements and / or assemblies of the system can be constructed from any of a wide variety of materials that provide sufficient strength or durability, in any of a wide variety of colors, textures, and combinations. Accordingly, all such modifications are intended to be within the scope of the present innovation. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the desired and other exemplary embodiments without departing from the spirit of the innovations.

[0057] The foregoing description is believed to be a description of exemplary embodiments only. Modifications to the device will occur to those skilled in the art and to those who make or use the device. Accordingly, it is to be understood that the embodiments shown in the drawings and described above are for illustrative purposes only and are not intended to limit the scope of the device as defined by the following claims, which are to be interpreted in accordance with principles of patent law, including the doctrine of equivalents. [Explanation of symbols]

[0058] 12 Light-emitting diode array 14. Light-emitting diode 16 Multiple Primary LEDs 18 Multiple Secondary LEDs 36 Boom 38 Lighting fixtures 42 Lighting fixtures

Claims

1. a light emitting diode array including a plurality of first light emitting diodes and a plurality of second light emitting diodes; a microlens array overlapping the plurality of first light emitting diodes and the plurality of second light emitting diodes, the microlens array including a plurality of first lenses corresponding to the plurality of first light emitting diodes and a plurality of second lenses corresponding to the plurality of second light emitting diodes, wherein a first geometric shape of at least one of the plurality of first lenses is different from a second geometric shape of at least one of the plurality of second lenses; an imaging device configured to capture an image based on light reflected from a target area due to illumination from the plurality of first light emitting diodes; at least one processing device in communication with the light emitting diode array and the imaging device; A lighting system comprising: The at least one processing device Identifying shadows cast on the target area by obstacles; an illumination system configured to selectively activate the plurality of second light emitting diodes to illuminate the target area from an unobstructed angle.

2. The at least one processing device determining that the plurality of first light emitting diodes are responsible for the shadow of the target area; deactivating the plurality of first light emitting diodes to limit the shadow; activating the plurality of second light emitting diodes to illuminate the target area; 10. The lighting system of claim 1, wherein the lighting system is configured as follows:

3. 3. The illumination system of claim 1, wherein the microlens array is an integrally formed layer overlying the light emitting diode array.

4. 2. The lighting system of claim 1, wherein the at least one processing device is configured to selectively activate the plurality of second light emitting diodes to illuminate the target area from the unobstructed angle while the light emitting diode array is statically positioned.

5. 3. The lighting system of claim 1, further comprising one or more actuators for adjusting a position of at least one of the plurality of first light-emitting diodes or the plurality of second light-emitting diodes.

6. 5. The lighting system of claim 1, wherein the plurality of first light emitting diodes are arranged in a first concentric circular pattern and the plurality of second light emitting diodes are arranged in a second concentric circular pattern.

7. When executed by the at least one processing unit, the at least one processing unit: Recognizing hand gestures in the image; Selectively turning on or off at least one of the plurality of first light-emitting diodes or the plurality of second light-emitting diodes; 5. A lighting system according to claim 1, further comprising a memory containing instructions to cause the lighting system to:

8. When executed by the at least one processing unit, the at least one processing unit: Recognizing hand gestures in the image; adjusting a position of at least one of the plurality of first light-emitting diodes or the plurality of second light-emitting diodes by one or more actuators; 5. A lighting system according to claim 1, further comprising a memory containing instructions to cause the lighting system to:

9. A ceiling luminaire comprising the lighting system of claim 1.

10. 5. The lighting system of claim 1, wherein the light emitting diode array is disposed on a mobile boom.

11. 5. The illumination system of claim 1, wherein the light emitting diode array and the imaging device are arranged on a common structure.

12. 5. The lighting system of claim 1, wherein one of the first and second geometries corresponds to distributing light at a predetermined divergence angle, and the other of the first and second geometries corresponds to distributing light at a predetermined convergence angle.

13. 5. The lighting system of claim 1, wherein the first geometric shape corresponds to distributing light at a first divergence angle and the second geometric shape corresponds to distributing light at a second divergence angle different from the first divergence angle.

14. 5. The lighting system of claim 1, wherein the first geometric shape corresponds to distributing light at a first convergence angle and the second geometric shape corresponds to distributing light at a second convergence angle different from the first convergence angle.

15. a light emitting diode array including a plurality of first light emitting diodes and a plurality of second light emitting diodes; a microlens array overlapping the plurality of first light emitting diodes and the plurality of second light emitting diodes, the microlens array including a plurality of first lenses corresponding to the plurality of first light emitting diodes and a plurality of second lenses corresponding to the plurality of second light emitting diodes, wherein a first geometric shape of the plurality of first lenses corresponds to a first illumination angle and a second geometric shape of the plurality of second lenses corresponds to a second illumination angle different from the first illumination angle; a control system in communication with the light emitting diode array; A lighting system comprising: The lighting system, wherein the control system is configured to selectively activate the plurality of second light emitting diodes and the plurality of second light emitting diodes to illuminate a target area from an unobstructed angle.

16. 16. The lighting system of claim 15, wherein one of the first illumination angle and the second illumination angle corresponds to distributing light at a predetermined divergence angle, and the other of the first illumination angle and the second illumination angle corresponds to distributing light at a predetermined convergence angle.

17. 16. The lighting system of claim 15, wherein the first illumination angle corresponds to distributing light at a first divergence angle and the second illumination angle corresponds to distributing light at a second divergence angle different from the first divergence angle.

18. 16. The lighting system of claim 15, wherein the first illumination angle corresponds to distributing light at a first convergence angle and the second illumination angle corresponds to distributing light at a second convergence angle different from the first convergence angle.

19. a light emitting diode array including a plurality of first light emitting diodes and a plurality of second light emitting diodes; a microlens array integrally formed with and overlapping a plurality of first light emitting diodes and a plurality of second light emitting diodes, the microlens array including a plurality of first lenses corresponding to the plurality of first light emitting diodes and a plurality of second lenses corresponding to the plurality of second light emitting diodes, wherein a first geometric shape of the plurality of first lenses corresponds to a first illumination angle and a second geometric shape of the plurality of second lenses corresponds to a second illumination angle different from the first illumination angle; a control system; A lighting system comprising: the control system is configured to selectively activate the light emitting diode array to obtain at least one of the first illumination angle and the second illumination angle while the light emitting diode array and the microlens array are statically positioned.

20. The control system includes: determining that an obstacle exists between the plurality of first light emitting diodes and a target area; deactivating the plurality of first light emitting diodes; activating the plurality of second light emitting diodes to illuminate a target area; 20. The lighting system of claim 19, further configured to:

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