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WO2024180468A1 - Système de détection d'obstruction - Google Patents

Système de détection d'obstruction Download PDF

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Publication number
WO2024180468A1
WO2024180468A1 PCT/IB2024/051854 IB2024051854W WO2024180468A1 WO 2024180468 A1 WO2024180468 A1 WO 2024180468A1 IB 2024051854 W IB2024051854 W IB 2024051854W WO 2024180468 A1 WO2024180468 A1 WO 2024180468A1
Authority
WO
WIPO (PCT)
Prior art keywords
cube
light
corner
detection area
prisms
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2024/051854
Other languages
English (en)
Inventor
Stefan Holmgren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neonode Inc
Original Assignee
Neonode Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neonode Inc filed Critical Neonode Inc
Publication of WO2024180468A1 publication Critical patent/WO2024180468A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
    • G01V8/14—Detecting, e.g. by using light barriers using one transmitter and one receiver using reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling

Definitions

  • the field of the present invention is obstruction detection, particularly for surfaces that function properly only when they are free of foreign objects.
  • the present invention addresses the need for obstruction detection, in applications that require that a surface remains free of foreign objects.
  • HUD head-up display
  • the HUD projector is often mounted beneath the front windshield at the rear of the instrument cluster, where loose objects may fall and block the projection.
  • inductive charging pads also known as wireless charging or cordless charging, whereby portable electronic equipment is charged through contact with an inductive charging pad without need to make electrical contact with a dock or plug. A foreign object between the inductive charging pad and the portable equipment may inhibit effective charging.
  • an obstruction detection system including one or more first cube-corner prisms positioned along a first edge of a rectangular detection area, one or more second cube-corner prisms positioned along a second edge of the detection area, the second edge being opposite the first edge, whereby said one or more first cube-corner prisms and said one or more second cube-corner prisms each include an input-output aperture facing the detection area, and are arranged to create a light channel back and forth across the detection area whereby a light beam projected towards the input-output aperture of one of said one or more first cube-corner prisms is successively reflected by said one or more first cube-corner prisms and said one or more second cube-corner prisms back and forth across the detection area, through the light channel at different locations along the first and second edges, between said one or more first cubecorner prisms and said one or more second cube-corner prisms,
  • said one or more first cube-corner prisms are shift-aligned with said one or more second cube-corner prisms.
  • the system includes a collimating lens coupled to the light emitter, collimating light emitted by the light emitter, a focusing lens coupled to the detector, focusing light entering the focusing lens onto the detector, and an optical system of lenses, wherein each cube-corner input-output aperture includes a first lens at its bottom half, and a second lens at its top half.
  • the obstruction detection system of the present invention is used for detecting an obstruction above a head-up display projector.
  • the obstruction detection system of the present invention is used for detecting an obstruction on an inductive charging pad.
  • an obstruction detection system including a cube-corner prism positioned at a first edge of a rectangular detection area, wherein said cube-corner prism comprises an input-output aperture facing the detection area, and a light emitter positioned at a second edge of the rectangular detection area, the second edge being opposite the first edge, wherein said light emitter is configured to emit light beams towards the input-output aperture of the cube-corner prism, a detector positioned at the second edge of the rectangular detection area, and a processor connected to said detector.
  • the cube-corner prism is arranged to create a light channel across the detection area whereby a light beam projected towards the input-output aperture of said cube-corner prism is reflected by said cube-corner prisms towards said detector, wherein said detector is configured to measure intensity of a light beam emitted by said light emitter after it has passed through the light channel, and wherein said processor is configured to determine a level of obstruction of the emitted light beam based on output from said detector.
  • FIG. 1 is a simplified illustration of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 2 is a simplified illustration of an object being detected in the obstruction detection system of FIG. 1, in accordance with an embodiment of the present invention
  • FIG. 3 is a simplified illustration of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 4 is a simplified illustration of the operation of the lenses opposite the emitter and the photodiode in FIG. 3, in accordance with an embodiment of the present invention
  • FIGS. 5 and 6 are simplified illustrations of the operation of the cube-corner prisms in FIG. 3, in accordance with an embodiment of the present invention.
  • FIG. 7 is a simplified illustration of a configuration for the lenses at the cube-corner prism apertures, in accordance with an embodiment of the present invention.
  • FIG. 8 is a simplified illustration of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIGS. 9 and 10 are simplified illustrations of different orientations of the cube-corner prisms, in accordance with embodiments of the present invention.
  • FIGS. 11 and 12 are simplified illustrations of obstruction detection systems, in accordance with an embodiment of the present invention.
  • FIG. 13 is a perspective view of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 14 is a simplified illustration of lenses at a cube-corner prism aperture and opposite an emitter in an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 15 is a flow chart of an obstruction detection method, in accordance with an embodiment of the present invention.
  • FIG. 16 is a simplified illustration of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 1 is a simplified illustration of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 1 shows an obstruction detection system using light reflected back and forth across a detection area using parallel arrangements of cube-corner prisms.
  • FIG. 1 shows cube-corner prisms 101 and 102 along a first edge of a rectangular detection area and cube-corner prisms 103 - 105 along the opposite edge of that detection area, shift-aligned with cube-corner prisms 101 and 102.
  • Emitter 501 emits light beam 301 toward the bottom half of an inputoutput aperture of cube-corner prism 105.
  • Cube-corner prism 105 reflects beam 301 back across the detection area as beam 302 towards the bottom half of an input-output aperture of cube-corner prism 101.
  • the light beam is repeatedly reflected and redirected across the detection area as beams 303 - 306, arriving at detector 502, e.g., a photodiode.
  • a detection signal from detector 502 is output to processor 505 that is configured to identify that no object is present in the detection area when the detection signal from detector 502 indicates that the light was not even partially blocked between emitter 501 and detector 502.
  • FIG. 2 is a simplified illustration of an object being detected in the obstruction detection system of FIG. 1, in accordance with an embodiment of the present invention.
  • FIG. 2 shows a change in output at detector 502 resulting from object 503 bring inserted into the detection area.
  • Object 503 straddles the paths of two unobstructed light beams: 304 and 305.
  • the lower portion of object 503 blocks a portion of beam 304 from reaching cube-corner prism 102.
  • less light arrives at detector 502 via cube-corner prisms 102 and 103, as illustrated in FIG. 2, when comparing the full light channels in cube-corner prisms 102 and 103 in FIG.
  • the lower detection signal output from detector 502 to processor 505 causes processor 505 to identify that an object has been inserted into the detection area. In various applications, this may be configured to generate an alert to the user.
  • FIG. 3 is a simplified illustration of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 3 shows the system of FIGS. 1 and 2 with lenses 111 - 120 placed at the input-output apertures of cube-corner prisms 101 - 105.
  • the input-output aperture of each cube-corner prism includes two lenses: a first lens at the bottom half of the input-output aperture, and a second lens at the top half of the input-output aperture.
  • corner prism 104 has lens 115 at the bottom half of its inputoutput aperture, and lens 116 at the top half of its input-output aperture.
  • FIG. 3 shows the system of FIGS. 1 and 2 with lenses 111 - 120 placed at the input-output apertures of cube-corner prisms 101 - 105.
  • the input-output aperture of each cube-corner prism includes two lenses: a first lens at the bottom half of the input-output aperture, and a second lens at the top
  • FIG. 3 also shows collimating lens 110 that collimates light from emitter 501, in order to fill the lens 111 aperture of cube-corner prism 105 with light.
  • Focusing lens 121 images collimated light from the aperture of lens 120 onto detector 502.
  • lenses 111 - 120 ensure that a maximum amount of light that leaves aperture 110 enters aperture 121, and all of lenses 110 - 121 ensure that the maximum amount of light is used by the detection channel.
  • the function of lenses 110 and 121 is illustrated in FIG. 4, and the function of lenses 111 - 120 is illustrated in FIGS. 5 and 6.
  • FIG. 4 is a simplified illustration of the operation of the lenses opposite the emitter and the photodiode in FIG. 3, in accordance with an embodiment of the present invention.
  • FIG. 4 shows collimating lens 110 and focusing lens 121.
  • collimating lens 110 is shown collimating light from the emitter 501 as light rays 310 - 312. Collimating lens 110 thus fills aperture of lens 111 (shown in FIG. 3) with collimated light.
  • Focusing lens 121 is shown directing the collimated output of cube-corner prism 103, shown as rays 315 - 317, onto detector 502.
  • FIGS. 5 and 6 are simplified illustrations of the operation of the cube-corner prisms in FIG. 3, in accordance with an embodiment of the present invention.
  • FIG. 5 shows how each cube-corner prism reflects a ray light back in the direction it came from; e.g., as illustrated by light ray 325, which is shown slightly skewed to emphasize that the cube-corner prism reflects any light ray entering the prism back in the direction it came from.
  • Each cube-corner prism 101 - 105 translates a light beam, that includes parallel light rays, sideways half of the cube-corner prism width, and flips the light in the perpendicular direction, as illustrated by light rays 320 - 322.
  • FIG. 6 shows the function of the two lenses at the input-output aperture of each cube-corner prism.
  • these lenses serve to maximize throughput by imaging the aperture of the previous lens in the channel to the next lens in the channel, to ensure that the maximum amount of light from emitter 501 that leaves aperture 110 enters aperture 121 and arrives at detector 502.
  • lenses 111 and 112 image the aperture of lens 110 to lens 113.
  • lenses 117 and 118 image the aperture of lens 116 to lens 119.
  • These lenses may be understood as a series of relay lenses, except that the current light channel transmits light, not an image, so there is no image being transferred as in the case of typical relay lenses.
  • Lenses 111 - 120 are illustrated focused at the midpoint between respective, opposite lenses. However, in other embodiments of the invention, these lenses are focussed on the mid-plane of the cube corners illustrated in FIG. 7.
  • FIG. 7 is a simplified illustration of a configuration for the lenses at the cube-corner prism apertures, in accordance with an embodiment of the present invention.
  • FIG. 7 shows cube-corner prism 103 having mid-plane 505.
  • lenses 125 and 126 at the input-output aperture of this cube-corner prism are focused on mid-plane 505.
  • FIG. 8 is a simplified illustration of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 8 shows a configuration using cube-corner prisms 130 and 131 of different sizes in order to place emitter 501 and detector 502 near each other, on a smaller PCB than in the configurations shown in FIGS. 1 - 6.
  • the light channel from emitter 501 to detector 502 includes beams 340 - 343 sequentially.
  • FIGS. 9 and 10 are simplified illustrations of different orientations of the cube-corner prisms, in accordance with embodiments of the present invention.
  • FIG. 9 shows an object detection system of the present invention with cube-corner prisms 141 - 143 oriented in a first direction.
  • FIG. 10 shows a second object detection system, similar to that of FIG. 9, except that cube-corner prisms 145 - 147, that replace cubecorner prisms 141 - 143 in FIG. 9, are flipped over.
  • the systems illustrated in FIGS. 9 and 10 work equally well.
  • FIGS. 9 and 10 work equally well.
  • FIG. 11 shows an implementation of optics for a 300mm x 60mm HUD projection screen object detection system, in accordance with the present invention.
  • This implementation has parallel cube-corner prism arrays 150 and 151 having four and five cubecorner prisms.
  • FIG. 12 shows an enlarged CAD model of the optical elements in FIG. 11.
  • FIG. 12 shows two lenses at the input-output aperture of each cube-corner prism, e.g., lenses 202 and 203 at the input-output aperture of the lower cube-corner prism in array 151, and lenses 204 and 205 at the input-output aperture of the lower cube-corner prism in array 150.
  • FIG. 12 also shows emitter 501 coupled to collimating lens 201 and photo diode 502 coupled to focusing lens 220.
  • the lenses in FIG. 12 are numbered in the order that light from emitter 501 passes through them as the light travels through the light channel.
  • FIG. 13 is a perspective view of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 13 shows a perspective view of the CAD model of the optical elements in FIG. 11, namely, cube-corner prism arrays 150 and 151, light emitter 501 and photodiode 502.
  • FIG. 14 is a simplified illustration of lenses at a cube-corner prism aperture and opposite an emitter in an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 14 shows an enlarged view of the bottom section of the CAD model of the optical elements in FIG. 11, namely, the bottom cube-corner prism 162 having lenses 251 and 252 at the prism inputoutput aperture, light emitter 501 and collimating lens 250.
  • FIG. 15 is a flow chart of an obstruction detection method, in accordance with an embodiment of the present invention.
  • Operation 600 is an initial setup stage in which parallel arrays of cube-corner prisms are arranged along opposite edges of a detection area.
  • This arrangement is designed such that a light beam projected towards a first one of the cube-corner prisms is successively reflected back and forth across the detection area between the arrays of cube-corner prisms at different locations along the opposite edges. Embodiments of such an arrangement have been discussed with respect to FIGS. 1 - 12.
  • the method then enters a loop, operations 601 - 603, of monitoring the detection area for an inserted object.
  • operation 601 light is projected toward a first one of the cube-corner prisms arranged at operation 600.
  • intensity of the projected light is measured after it has been successively reflected between the arrays of cube-corner prisms at different locations along the opposite edges.
  • a level of obstruction of the emitted light beam is determined based on the measured intensity.
  • the light reflected between the arrays of cube-corner prisms at different locations along the opposite edges passes over the entire detection area, such that an object inserted anywhere in the detection area will block at least some of the light, resulting in a lower measurement at operation 602 than when no object is present.
  • the amount of blocked light indicted by the measurement at operation 602 is used to infer the size of the inserted object.
  • the system reports any object detection to a host system that uses this information, e.g., to alert the user of the presence of an obstructive object that may interfere with the proper operation of the host system.
  • FIG. 16 is a simplified illustration of an obstruction detection system, in accordance with an embodiment of the present invention.
  • FIG. 16 shows a configuration using a cube-corner prism 170 positioned at a first edge of a rectangular detection area.
  • the cube-corner prism 170 comprises an input-output aperture facing the detection area an emitter 501 is positioned at a second edge of the rectangular detection area opposite to the first edge.
  • the emitter 501 is configured to emit light beams towards the input-output aperture of the cube-corner prism.
  • a detector 502 is also positioned at the second edge of the rectangular detection area.
  • the light channel from emitter 501 to the detector 502 includes beams 350 and 351 sequentially.
  • the obstruction detection system also includes a processor 505 connected to the detector 502 and to the emitter 501.
  • the cube-corner prism 170 is arranged to create a light channel across the detection area whereby the light beam 350 projected towards the input-output aperture of said cubecorner prism is reflected by the cube-corner prism 170 towards the detector 502.
  • the detector 502 is configured to measure intensity of a light beam emitted by said light emitter after it has passed through the light channel.
  • the processor 505 is configured to determine a level of obstruction of the emitted light beam based on output from the detector 502. Two or more of the arrangement illustrated in Fig. 16 can be used to cover a larger detection area.
  • Embodiments of the obstruction detection system in Fig. 16 comprises lenses 180 - 182 placed at the input-output apertures of the cube-corner prism 170.
  • the input-output aperture of the cube-corner prism 170 includes two lenses: a first lens 181 at the top half of the input-output aperture, and a second lens 182 at the bottom half of the input-output aperture.
  • FIG. 16 also shows a collimating lens 180 that collimates light from emitter 501, in order to fill the first lens 181 aperture of cube-corner prism 170 with light.
  • a focusing lens 183 images collimated light from the aperture of the second lens 182 onto the detector 502.
  • the lenses 180 - 183 ensure that a maximum amount of light that leaves the collimating lens 180 enters focusing lens 183, and ensure that the maximum amount of light is used by the detection channel.
  • the function of the two lenses 181, 182 at the input-output aperture of the cube-corner prism 170 is described in the following. As light travels through the channel formed by the cube-corner prism 170 and lenses 180 - 183, the two lenses 181, 182 at the input-output aperture of the cube-corner prism 170 serve to maximize throughput to ensure that the maximum amount of light from emitter 501 that leaves the aperture of the lens 180 enters the aperture of the lens 183 and arrives at the detector 502. Thus, the two lenses 181, 182 image the aperture of the lens 180 to the aperture of the lens 183.
  • the two lenses 181, 182 lenses may be understood as relay lenses, except that the current light channel transmits light, not an image, so there is no image being transferred as in the case of typical relay lenses.
  • Another way to see the two lenses 181, 182 is as field lenses, except that the current light channel transmits light, not an image, so there is no image being transferred as in the case of typical field lenses.
  • An obstruction detection system comprising: a plurality of first cube-corner prisms positioned along a first edge of a rectangular detection area; a plurality of second cube-corner prisms positioned along a second edge of the detection area, the second edge being opposite the first edge, whereby said first and second cube-corner prisms each comprise an input-output aperture facing the detection area, and are arranged to create a light channel back and forth across the detection area whereby a light beam projected towards the input-output aperture of one of said first cubecorner prisms is successively reflected by the first and second cube-corner prisms back and forth across the detection area, through the light channel at different locations along the first and second edges, between said first cube-corner prisms and said second cube-corner prisms; a light emitter emitting light beams towards the input-output aperture of one of said first cube-corner prisms; a photodiode positioned to measure intensity of a light beam
  • Item 2 The obstruction detection system of claim item 1, wherein said first cube-corner prisms are shift-aligned with said second cube-corner prisms.
  • Item 3 The obstruction detection system of claim item 1, further comprising: a collimating lens coupled to said light emitter, collimating light emitted by said light emitter; a focusing lens coupled to said photodiode, focusing light entering the focusing lens onto said photodiode; and an optical system of lenses, wherein each cube-corner inputoutput aperture includes a first lens at its bottom half, and a second lens at its top half.
  • Item 4 The obstruction detection system of any of claims items 1 - 3, wherein the detection area is an exposed surface of a head-up display projector lens.
  • Item 5 The obstruction detection system of any of claims items 1 - 3, wherein the detection area is an exposed surface of an inductive charging pad.
  • An obstruction detection method comprising: arranging a plurality of first cube-corner prisms along a first edge of a rectangular detection area; further arranging a plurality of second cube-corner prisms along a second edge of the detection area, the second edge being opposite the first edge, whereby said first and second cube-corner prisms each comprise an input-output aperture facing the detection area, and are arranged to create a light channel back and forth across the detection area whereby a light beam projected towards the input-output aperture of one of said first cube-corner prisms is successively reflected by the first and second cubecorner prisms back and forth across the detection area, through the light channel at different locations along the first and second edges, between said first cube-corner prisms and said second cube-corner prisms; emitting light beams towards the input-output aperture of one of said first cube-corner prisms; measuring intensity of a light beam emitted by said emitting, after the light beam has completely
  • Item 7 The obstruction detection method of claim item 6, wherein said arranging and said further arranging comprise shift-aligning the first cubecorner prisms with the second cube-corner prisms.
  • Item 8 The obstruction detection method of claim item 6, further comprising: collimating light beams emitted by said emitting; for each reflection by one of the first and second cube-corner prisms, passing the light beam through a first lens as the beam enters the input-output aperture of that cube-corner prism, and passing the light beam through a second lens as the beam exits that input-output aperture; and, focusing the light beam that has completely passed through the light channel prior to said measuring.
  • Item 9 Using the obstruction detection method of any of claims items 6 - 8, to detect objects on an exposed surface of a head-up display projector lens. Item 10. Using the obstruction detection method of any of claims items 6 -

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Optics & Photonics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

L'invention concerne un système de détection d'obstruction, comprenant des premiers prismes à coins de cube le long d'un premier bord d'une zone de détection rectangulaire, des seconds prismes à coins de cube le long d'un second bord de la zone de détection opposé au premier bord, les prismes comprenant chacun une ouverture faisant face à la zone de détection, et étant disposés de manière à créer un canal lumineux traversant la zone de détection de part en part, de sorte qu'un faisceau lumineux projeté vers l'ouverture de l'un des premiers prismes est successivement réfléchi par les premiers et seconds prismes traversant la zone de détection de part en part, à travers le canal lumineux à des endroits situés le long des premier et second bords, un émetteur émettant des faisceaux lumineux vers l'un des premiers prismes, une photodiode mesurant l'intensité d'un faisceau lumineux émis par l'émetteur, après qu'il a complètement traversé le canal lumineux, et un processeur déterminant un degré d'obstruction du faisceau lumineux sur la base d'une sortie de photodiode.
PCT/IB2024/051854 2023-02-27 2024-02-27 Système de détection d'obstruction Ceased WO2024180468A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202363487255P 2023-02-27 2023-02-27
US63/487,255 2023-02-27

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WO2024180468A1 true WO2024180468A1 (fr) 2024-09-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014127300A (ja) * 2012-12-26 2014-07-07 Panasonic Industrial Devices Sunx Co Ltd リフレクタ、リフレクタ反射型光電センサ及び多光軸光電センサ
US20160068071A1 (en) * 2013-04-22 2016-03-10 Robert Bosch Gmbh Device for inductively transmitting energy and method for operating an inductive energy-transmission device
FR3064081A1 (fr) * 2017-03-17 2018-09-21 Valeo Comfort And Driving Assistance Afficheur tete haute

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014127300A (ja) * 2012-12-26 2014-07-07 Panasonic Industrial Devices Sunx Co Ltd リフレクタ、リフレクタ反射型光電センサ及び多光軸光電センサ
US20160068071A1 (en) * 2013-04-22 2016-03-10 Robert Bosch Gmbh Device for inductively transmitting energy and method for operating an inductive energy-transmission device
FR3064081A1 (fr) * 2017-03-17 2018-09-21 Valeo Comfort And Driving Assistance Afficheur tete haute

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