REDUCED WINDAGE PRISMATIC POLYGONAL REFLECTOR FOR SCANNING
An improved prismatic polygonal reflector with increased aerodynamic properties and reduced scattering of reflected light is provided. The reflector may be used for scanning, and may include a first end, a second end, a plurality of side surfaces located circumferentially about a center axis of the reflector, and a plurality of intersections joining the plurality of side surfaces. Each of the plurality of intersections includes a curved or a flat portion and a pointed portion aligned circumferentially with other pointed portions on the plurality of intersections to provide a circumference around the reflector for light to reflect and form a scanning beam without light scattering. A system and method for scanning with the reflector is also provided.
The field of the invention relates to scanners and related components, and more specifically, to reflectors used with scanners.
BACKGROUNDA scanning device often incorporates multiple components that work together to generate a beam of light for scanning. These components may include a light emitting component and a reflector that together generate a scanning beam. The scanning beam may, for example, be used for dimensional or barcode scanning.
In certain designs, the reflector may include multiple sides, and may rotate so that light from the light emitting component is reflected from each side of the reflector in succession during operation of the scanner. Rotational operation of the reflector may cause wind drag and thermal friction from air moving over the spinning reflector, and also notably, light scattering, or rather, scattered light in portions of the beam from light reflected off of intersections between surfaces of the reflector. This may affect the accuracy of scanning and the ability to place scanners in close proximity to each other. Accordingly, an improved reflector that addresses these issues, among others, is needed.
SUMMARYThis summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description section of this disclosure. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. The scope of the invention is defined by the claims.
In brief, and at a high level, this disclosure describes, among other things, a prismatic polygonal reflector that can be used for generating a beam of light for a scanner. The design of the reflector disclosed herein may improve aerodynamic performance and also reduce scattering of light during operation of the scanner. An exemplary polygonal reflector includes first and second ends and a plurality of side surfaces located circumferentially around a center axis of the reflector. The side surfaces are joined together at intersections. A portion of each intersection may include a flat, curved, and/or otherwise aerodynamically formed portion that reduces aerodynamic drag when the reflector is in operation and spinning. Additionally, each of the intersections may include a pointed portion that helps provide a reduction in scattered light from the reflector when light passes from one side surface of the reflector to another side surface across an intersection.
In a first embodiment of the invention, a polygonal reflector is provided. The reflector comprises a first end located perpendicular to a plurality of side surfaces, a second end located opposite to the first end and located perpendicular to the plurality of side surfaces, the plurality of side surfaces located circumferentially about a center axis of the reflector, and a plurality of intersections joining the plurality of side surfaces, where each of the plurality of intersections includes a curved or a flat portion, and a pointed portion aligned circumferentially with other pointed portions on the plurality of intersections.
In a second embodiment of the invention, a scanning system is provided. The system comprises a light emitting component and a polygonal reflector comprising a first end located perpendicular to a plurality of side surfaces, a second end located opposite to the first end and located perpendicular to the plurality of side surfaces, the plurality of side surfaces located circumferentially about a center axis of the reflector, and a plurality of intersections joining the plurality of side surfaces. Additionally, each of the plurality of intersections includes a curved or a flat portion, and a pointed portion aligned circumferentially with other pointed portions on the plurality of intersections. Further, when light is emitted from the light emitting component and directed towards the reflector, and when the reflector is rotating about the center axis, the light is reflected from each of the plurality of side surfaces and each of the circumferentially aligned pointed portions, forming a scanning beam.
In a third embodiment of the invention, a method for reduced-interference scanning is provided. The method comprises providing a first light emitting component, providing a polygonal reflector comprising a first end located perpendicular to a plurality of side surfaces, a second end located opposite to the first end and located perpendicular to the plurality of side surfaces, the plurality of side surfaces located circumferentially about a center axis of the reflector, and a plurality of intersections joining the plurality of side surfaces, where each of the plurality of intersections includes a curved or a flat portion and a pointed portion aligned circumferentially with other pointed portions on the plurality of intersections. The method further comprises spinning the reflector about the center axis, and directing light from the light emitting component towards the reflector such that the light is reflected from each of the plurality of side surfaces and the circumferentially aligned pointed portions to form a scanning beam.
The reflector described in this disclosure is frequently discussed in the context of dimensional and barcode scanners and scanning. However, the reflector may be incorporated and used for any type of scanning done with a beam of light or a laser. Such variations are possible and contemplated.
As described in this disclosure, the term “prismatic” refers to an object that relates to, resembles, or constitutes a prism. A prism may be defined as an object having parallel bases or ends that are the same size and/or shape, and side surfaces that are parallelograms. The term “polygonal” refers to an object that has side and end surfaces which are each a closed plane or figure having three or more sides.
The present invention is described in detail below with reference to the attached drawing figures, wherein:
The subject matter of the present invention is described with specificity herein to meet statutory requirements. However, the description itself is not intended to limit the scope of the invention. Rather, the claimed subject matter might be embodied in other ways, to include different steps or combinations of steps similar to the ones described in this document, and in conjunction with other present or future technologies. Moreover, although the terms “step” or “block” may be used herein to connote different elements of various methods employed, the terms should not be interpreted as implying any particular order among or between various steps or blocks unless and except the order of individual steps or blocks is explicitly described or required.
At a high level, the present invention generally relates to a prismatic polygonal reflector that provides improved aerodynamic properties and reduced scattering of reflected light. More specifically, the polygonal reflector may include a plurality of at least partially reflective side surfaces that form a polygonal prism, with a plurality of intersections providing transitions between adjacent side surfaces on the reflector. At least a portion of each intersection may be aerodynamically formed with a curved or a flat surface, to reduce air drag over the intersection when the reflector is spinning.
Additionally, at least part of the intersection may include a pointed portion that extends directly adjacent side surfaces of the reflector to a point, or a distal end. At least some of the pointed portions may be aligned circumferentially around the reflector, so that at a particular axial position between the first end and the second end of the reflector, the pointed portions circumscribe the reflector, with at least one pointed portion positioned on each intersection at the axial position. As a result, a less-scattered reflection of light is possible at each intersection at the axial position, which produces a more concentrated beam of light for scanning, while maintaining improved aerodynamic properties of the reflector due to the placement of the flat or curved portions on the intersection.
Referring now to
Referring now to
The reflector 20 in
Referring now to
The aerodynamic contours 36 may be any shape or configuration that improves the transition of air over the aerodynamic intersections 34 compared to the intersections 30 shown in
Referring now to
As shown in
Furthermore, the aerodynamically formed portions 40 in
Referring now to
Additionally, in
Referring now to
In
The invention may be described in the general context of computer code or machine-useable instructions, including computer-executable instructions such as program modules, being executed by a computer or other machine, such as a personal data assistant or other handheld device. Generally, program modules including routines, programs, objects, components, data structures, etc., refer to code that performs particular tasks or implements particular abstract data types. The invention may be practiced in any variety of system configurations, including hand-held devices, consumer electronics, general-purpose computers, and more specialty computing devices, among others. The invention may also be practiced in distributed computing environments where tasks are performed by remote-processing devices that are linked through a communications network.
Computing device 500 may include a variety of computer-readable media and/or computer storage media. Computer-readable media may be any available media that can be accessed by computing device 500 and includes both volatile and non-volatile media, removable and non-removable media. By way of example and not limitation, computer-readable media may comprise computer storage media and communication media and/or devices. Computer storage media may include volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by computing device 500. These memory components can store data momentarily, temporarily, or permanently. Computer storage media does not include signals per se.
Communication media typically embodies computer-readable instructions, data structures, or program modules. By way of example, and not limitation, communication media includes wired media such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared, and other wireless media. Combinations of any of the above should also be included within the scope of computer-readable media.
Memory 512 includes computer storage media in the form of volatile and/or non-volatile memory. The memory may be removable, non-removable, or a combination thereof. Exemplary hardware devices include solid-state memory, hard drives, optical-disc drives, etc. Computing device 500 includes one or more processors that read data from various entities such as memory 512 or I/O components 520. Presentation component(s) 516 present data indications to a user or other device. Exemplary presentation components include a display device, speaker, printing component, vibrating component, etc. I/O ports 518 allow computing device 500 to be logically coupled to other devices including I/O components 520, some of which may be built-in. Illustrative components include a microphone, joystick, game pad, satellite dish, scanner, printer, wireless device, and the like.
Referring now to
As shown in
In order to reduce or eliminate the scattered light 68, the emittance of the light 66 from the light emitting component 60 may be timed, or rather, sequenced, to prevent or reduce the reflection of the light 66 from the aerodynamic intersections 34. In this respect, the light 66 may be emitted when the light 66 will only be reflected by the side surfaces 26 of the reflector 32, rather than the aerodynamic intersections 34 (some small reflection of light is always possible; timing the emission may merely reduce the scattered light 68 caused by reflection of the light 66 from the aerodynamic intersections 34).
As one example, when the light 66 is going to cross an aerodynamic intersection 34, the light emitting component 60 may shut off, such as at the first angle 70 shown in
Referring now to
The light 66 emitted from the light emitting component 60 in
Referring now to
Referring now to
Referring to
At a block 1014, the reflector is spun about the center axis. The amount of spin around the center axis can be set, determined, and/or varied based on the desired number of reflections per second from each surface of the reflector, or a desired number of revolutions per second. A possible spinning configuration may be 10 revolutions per second, for example. At a block 1016, light, such as the light 66 shown in
Referring now to
The returned light 86 is the light 66 reflected from an object and received within the housing 81, where it is concentrated on a first collecting lens 82. The first collecting lens 82 concentrates the returned light 86 and directs it onto a collecting mirror 84 which reflects the returned light 86 towards a second collecting lens 88, where the reflected light 86 is concentrated into a detector 90. The design shown in
The reflector described herein may be a scanning mirror with mirrored reflective surfaces. The reflector may have multiple facets with a rectangular shape. The rectangular shape may allow for a better collection aperture for the light. Each intersection may include a double face facet intersection and include, at least partially, a sharp corner, where the sharp corner may be positioned in the center of each facet intersection, and a radiused corner for the remaining part of the respective facet intersection. The radiused and sharp corner implementation may be equal for each facet, and/or aligned longitudinally for each facet intersection.
The reflector may have one of a variety of polygonal constructions. Each of the side surfaces may be square, rectangular, trapezoidal, or another geometric shape. Furthermore, the side surfaces may be arranged about the center axis of the reflector such that they are equal in size and/or have the same geometric shape. Furthermore, the geometric shape may be a square or rectangle that terminates at the first and second ends of the reflector.
The intersections between side surfaces may have different features and geometric configurations. For example, each intersection may include a radiused portion extending from the first end of the reflector to a pointed portion, which may be approximately halfway between the first end and the second end of the reflector. The pointed portion may include a sharp edge, or be extruded from the radiused portion to form a distal end that is sharper, or more abruptly transitional, than the radiused portion. The intersection may generally be rectangular in shape, having a uniform radius, length, and/or width (width may be measured as the distance between adjacent side surfaces). A singular or composite construction of the reflector is contemplated. Additionally, multiple curved or flat portions may be incorporated at different points along the intersection, depending on the number and position of pointed portions that are utilized on the intersection. The reflector may be a hexagonal shape about the center axis, as shown in
The combination of reduced windage, or rather, increased aerodynamic and thermal performance (e.g., maintaining of temperature) allows scanners of any kind utilizing the reflectors described herein to be mounted in closer proximity to one another with reduced interference from light scattering from one or multiple scanners. This allows for use of multiple scanners in space-limited locations.
Timing the light emitted from the light emitting component for reduction of scattered light may be used separately or in conjunction with the circumferentially aligned pointed portion configuration. In this respect, a possible timing sequence may include the following: light emitting component off during a curved or flat intersection, light emitting component on during a scan across an in-beam sensor, light emitting component off depending on the desired size of scan angle, light emitting component on for a data gathering portion of the scan, light emitting component off depending on the size of the scan angle, light emitting component on during a scan across the phase reference, light emitting component off during a curved or flat portion of the intersection. This sequence may repeat and/or may occur continuously as the reflector is rotated around the center axis.
Additional advantages of the reflectors described herein include closer positioning of scanners, reduced power consumption due to reduced windage, and reduced internal temperature of associated scanners. The formation of the pointed portion on each intersection may be accomplished in a variety of ways. One such method is to begin creating or machining a radius along the intersection, and at a desired position for the pointed portion, withholding from forming or machining of the radius to leave a sharp, pointed, and/or distal end, such as the pointed portion 42 with the distal end 46 shown in
The present invention has been described in relation to particular embodiments, which are intended in all respects to be illustrative rather than restrictive. Alternative embodiments will become apparent to those of ordinary skill in the art to which the present invention pertains without departing from its scope.
Claims
1. A polygonal reflector, the reflector comprising:
- a first end located perpendicular to a plurality of side surfaces;
- a second end located opposite to the first end and located perpendicular to the plurality of side surfaces;
- the plurality of side surfaces located circumferentially about a center axis of the reflector; and
- a plurality of intersections joining the plurality of side surfaces, wherein each of the plurality of intersections includes: a curved or a flat portion, and a pointed portion aligned circumferentially with other pointed portions on the plurality of intersections.
2. The reflector of claim 1, wherein the plurality of side surfaces comprises six polygonal side surfaces that form a hexagonal shape, and wherein the side surfaces extend from the first end to the second end.
3. The reflector of claim 1, wherein each of the plurality of intersections extends from the first end to the second end, and wherein each of the plurality of intersections is a uniform width between the first end and the second end.
4. The reflector of claim 1, wherein each intersection includes:
- a first curved or flat portion extending from the first end to the pointed portion, and
- a second curved or flat portion extending from the second end to the pointed portion,
- wherein the pointed portion extends further radially from the center axis than the first or the second curved or flat portions.
5. The reflector of claim 1, wherein for each of the plurality of intersections, the pointed portion comprises an edge along at least a portion of a length of the intersection between the first end and the second end, the edge being more pointed than the curved or flat portion of the intersection.
6. The reflector of claim 1, wherein the pointed portion further comprises a first side and a second side converging at a distal end, wherein the first side is coplanar with a first side surface adjacent the respective intersection, and wherein the second side is coplanar with a second side surface adjacent the respective intersection.
7. The reflector of claim 1, wherein each of the plurality of side surfaces is reflective, and wherein the pointed portion and the curved or flat portions of each intersection are linearly aligned.
8. The reflector of claim 1, wherein each pointed portion is at a midpoint of a respective intersection between the first end and the second end.
9. A scanning system, the system comprising:
- a light emitting component;
- a polygonal reflector comprising: a first end located perpendicular to a plurality of side surfaces; a second end located opposite to the first end and located perpendicular to the plurality of side surfaces; the plurality of side surfaces located circumferentially about a center axis of the reflector; and a plurality of intersections joining the plurality of side surfaces, wherein each of the plurality of intersections includes: a curved or a flat portion; and a pointed portion aligned circumferentially with other pointed portions on the plurality of intersections, wherein, when light is emitted from the light emitting component and directed towards the reflector, and when the reflector is rotating about the center axis, the light is reflected from each of the plurality of side surfaces and each of the circumferentially aligned pointed portions, forming a scanning beam.
10. The system of claim 9, wherein the beam includes less scattered light when the light emitted from the light emitting component is reflected from the pointed portion versus the curved or flat portion of each intersection.
11. The system of claim 9, wherein each curved or flat portion comprises a uniform width.
12. The system of claim 9, wherein the reflector comprises six side surfaces that form a hexagonal shape about the center axis.
13. The system of claim 9, wherein each of the plurality of intersections is a constant width between the first end and the second end.
14. The system of claim 9, wherein each of the plurality of side surfaces comprises a mirrored surface.
15. The system of claim 9, further comprising one or more lenses through which at least a portion of the light emitted from the light emitting component passes prior to reaching the reflector.
16. The system of claim 10, further comprising a conveyer, wherein the scanning beam is at least partially directed towards the conveyer, and wherein the scanning beam provides dimensional scanning of objects on the conveyer.
17. A method for reduced-interference scanning,the method comprising:
- providing a first light emitting component;
- providing a polygonal reflector comprising: a first end located perpendicular to a plurality of side surfaces; a second end located opposite to the first end and located perpendicular to the plurality of side surfaces; the plurality of side surfaces located circumferentially about a center axis of the reflector; and a plurality of intersections joining the plurality of side surfaces, wherein each of the plurality of intersections includes: a curved or a flat portion, and a pointed portion aligned circumferentially with other pointed portions on the plurality of intersections;
- spinning the reflector about the center axis; and
- directing light from the light emitting component towards the reflector such that the light is reflected from each of the plurality of side surfaces and the circumferentially aligned pointed portions to form a scanning beam.
18. The method of claim 17, wherein each of the curved or flat portions of the plurality of intersections comprises a uniform width.
19. The method of claim 17, wherein the reflector comprises six side surfaces that form a hexagonal shape about the center axis, and wherein the plurality of intersections are a constant width between the first end and the second end.
20. The method of claim 17, wherein the pointed portion of each intersection includes a first side and a second side, wherein the first side is coplanar with a first adjacent side surface, and wherein the second side is coplanar with a second adjacent side surface.
Type: Application
Filed: Sep 29, 2015
Publication Date: Mar 30, 2017
Inventor: EDWARD CHALEFF (DOYLESTOWN, PA)
Application Number: 14/869,484