WO2001038906A2 - Dispositif de retroreflexion optique - Google Patents

Dispositif de retroreflexion optique Download PDF

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Publication number
WO2001038906A2
WO2001038906A2 PCT/US2000/032368 US0032368W WO0138906A2 WO 2001038906 A2 WO2001038906 A2 WO 2001038906A2 US 0032368 W US0032368 W US 0032368W WO 0138906 A2 WO0138906 A2 WO 0138906A2
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WO
WIPO (PCT)
Prior art keywords
retro
devices
holographic
optical
reflection apparatus
Prior art date
Application number
PCT/US2000/032368
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English (en)
Other versions
WO2001038906A3 (fr
Inventor
Milan M. Popovich
Antoine Yvon Messiou
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Digilens, 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 Digilens, Inc. filed Critical Digilens, Inc.
Priority to AU16628/01A priority Critical patent/AU1662801A/en
Publication of WO2001038906A2 publication Critical patent/WO2001038906A2/fr
Publication of WO2001038906A3 publication Critical patent/WO2001038906A3/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/203—Filters having holographic or diffractive elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/16—Signs formed of or incorporating reflecting elements or surfaces, e.g. warning signs having triangular or other geometrical shape
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals

Definitions

  • the present invention relates to an optical retro-reflection device, and more particularly to an optical retro-reflection device employing switchable holographic diffraction devices.
  • Retro-reflective devices and materials are those that reflect and re-emit light incident on such devices and in a direction that is parallel to that of the source of the incident light. Put another way, such materials and devices reflect light directly back to the source of the light they are reflecting or re-emitting. Such materials and devices are widely used in the areas of nighttime transportation and safety. They are used to identify highway lanes and signs using the light emitted from vehicle headlights for example.
  • an optical retro-reflection device comprising a retro-reflector which is disposed to receive light incident upon the device and to reflect and re-emit the light from the device in a direction parallel to its direction of incidence.
  • a plurality of holographic diffraction devices are disposed to act upon the incident light between the source of the light and its being incident upon and being re-emitted by the optical retro-reflection device.
  • Each of the holographic diffraction devices are operative to act upon a different wavelength band of radiation (e.g. red, green or blue visible light) and are switchable between an active, diffracting state and an inactive, non-diffracting state.
  • a control circuit coupled to the holographic diffraction devices is operative to selectively switch the holographic diffraction devices between their active and inactive states.
  • the retro-reflector can be a single cube corner prism or three orthogonally arranged plane reflectors.
  • the retro-reflector can be an array of such prisms or reflectors.
  • the optical retro-reflection device can include a set of holographic diffraction devices each associated with one of the individual prisms/reflectors making up the array, or the diffraction devices can each be associated with a group of the prisms/reflectors.
  • the retro-reflector can be an array of Microspheres, or an array of micro-prisms each of which is in the form of a cube corner.
  • a single diffraction device can be associated with the entire array, or a number of diffraction devices may be associated each with a portion off the array.
  • the holographic diffraction devices are each composed of a transmission hologram and are disposed optically in front of the retro- reflector with respect to the direction of incidence of the light.
  • the transmission holograms preferably operate in an additive mode.
  • the holographic diffraction devices are each composed of a reflection hologram, and the retro-reflector is configured as three orthogonally-arranged reflection devices each of which is composed of a filter and one of the holographic diffraction devices.
  • the filter of each reflection device is disposed optically in front of its associated holographic diffraction device, and is operative to transmit radiation of a wavelength band which corresponds to that intended to be acted upon by that holographic diffraction device.
  • the filter of each reflection device is an interference filter, preferably a dichroic filter.
  • a light absorbing element is disposed on the surface of the holographic diffraction elements opposite to the surface that is coupled to the filter.
  • At least one of the reflection devices can deviate from the orthogonal with respect to the other two reflection devices, when further composed of an optical device that is operative to compensate for this deviation.
  • This compensating optical device can be a Fresnel lens or a Fresnel prism, in which case it is preferable that such lens or prism be optically interposed between the respective filter and the respective holographic diffraction device.
  • Figure 1 is a schematic side view of a first embodiment of an optical retro- reflection device according to the present invention, wherein the retro-reflector is a single cube corner prism or three orthogonally arranged plane reflectors.
  • Figure 2 is a schematic side view of a second embodiment of an optical retro- reflection device according to the present invention, where the retro-reflector is an array of cube corner prisms or three orthogonally arranged plane reflectors.
  • Figure 3 is a schematic side view of a second embodiment of an optical retro- reflection device according to the present invention, where the retro-reflector is an array of Microspheres, or an array of micro-prisms each of which is in the form of a cube corner.
  • Figure 4 is a schematic side view of a second embodiment of an optical retro- reflection device according to the present invention, where the retro-reflector is an array of Microspheres, or an array of micro-prisms each of which is in the form of a cube corner, and where a number of holographic diffraction devices is associated with a different portion of the array.
  • the retro-reflector is an array of Microspheres, or an array of micro-prisms each of which is in the form of a cube corner, and where a number of holographic diffraction devices is associated with a different portion of the array.
  • Figure 5 is a schematic perspective view of a fifth embodiment of an optical retro- reflection device according to the present invention where, the holographic diffraction devices are each composed of a reflection hologram, and the retro-reflector is configured as three orthogonally-arranged reflection devices each of which is composed of a filter and one of the holographic diffraction devices.
  • Figures 6 and 7 are similar views to Figure 5 but showing modified arrangements employing a Fresnel lens or a Fresnel prism.
  • Figure 8 is a cross-sectional illustration of the devices shown in Figures 6 and 7.
  • optical retro- reflective device of the present invention employ one or more holographic diffraction elements. These devices can be switched from an active state in which they selectively diffract light of a predetermined band of wavelengths incident upon their surfaces, to an inactive state during which they pass the incident light with no diffractive effect on the light passing through them.
  • these holographic diffraction devices are essentially holograms that have been pre-recorded into a medium.
  • the recording medium is typically a polymer-dispersed liquid crystal mixture which undergoes phase separation during the hologram recording process, creating fringes comprising regions densely populated by liquid crystal micro-droplets interspersed with regions of clear polymer.
  • These can be thin phase holograms (that is holograms which conform to the Raman Nath regime) or they can be volume holograms, also known as thick or Bragg holograms.
  • the holographic diffraction devices 12, 13 and 14 are essentially composed of transmissive-type holographic devices operating in the additive mode.
  • the holograms are created to selectively diffract a certain pre-established wavelength band of interest.
  • the diffracted component i.e. the pre-determined wavelength of interest
  • the remaining wavelength bands of the incident light are transmitted through the device and exit the other side with no angle of diffraction. If the diffracted light component is used in some way apart from the other components, the operation of the device is that of an optical band-pass filter.
  • these holographic devices have been stacked with each of the devices programmed to diffract a different wavelength band of radiation, such as red, green and blue visible light.
  • the devices can be programmed via their holograms to diffract for example, red, blue and green light respectively. If only one is active, then only one wavelength is diffracted and the remaining light components pass straight through the stack. If more than one of the devices is active at a time, then a combination of light will be diffracted.
  • Transmissive devices can also be manufactured to operate in a subtractive mode as well, in which case the active device will diffract all components of incident light except for the wavelength band of interest.
  • reflective-type holographic diffractive devices are employed. For these devices, while in the active state they diffract the wavelength band for which they are programmed by reflecting the diffracted light component from the same surface upon which the source light is incident, while passing the remaining components through and out the opposite surface.
  • transmissive-type devices are sensitive to the polarization state of the light incident thereon, whereas reflective-type devices are insensitive to polarization. More particularly, the diffraction efficiency for p-polarized light is significantly greater than that for s-polarized light in transmissive-type devices. As a result, the s-polarized component of the light tends to pass through the holographic diffraction devices unaffected and is therefore lost from the system. This loss gives rise to a loss of intensity of the diffracted light.
  • FIG. 1 a first preferred embodiment of an optical retro- reflection device is illustrated that is operative to receive (as indicated by arrow I) light incident from a white light source (not shown) and to reflect and re-emit that light in a direction parallel to its direction of incidence, as indicated by arrow R.
  • the device comprises generally a retro-reflector 10, preferably in the form of a cube corner prism, and a stack 11 of holographic diffraction devices disposed optically in front of the retro- reflector 10 with respect to the direction of incidence of the white light.
  • the stack 11 is composed of three switchable holographic diffraction devices 12, 13 and 14 which are designed to act respectively upon red, green and blue wavelength bands in the visible spectrum.
  • Each of the holographic diffraction devices 12, 13 and 14 essentially comprises a transmissive-type hologram that is switchable, by means of a pair of electrodes (not shown), between an active, diffracting state and an inactive, non-diffracting state. In its active state, each of these devices is operative to diffract light falling within its appropriate wavelength band.
  • an electric field is applied to the hologram by means of the aforementioned electrodes, the fringes of the hologram are effectively erased so that the holographic diffraction device has no material effect on the light passing there through.
  • the optical retro-reflection device also comprises a control circuit 15 that controls switching of the holographic diffraction devices 12, 13 and 14 between their active and inactive states. More particularly, the control circuit 15 operates such that, when any one of the devices 12,13 and 14 is activated, the other two devices are de-activated. Thus, when the device 12 is activated by the control circuit 15, it diffracts red wavelengths from the incident white light towards a front aperture 16 of the retro-reflector 10 (as indicated by arrow A R ). The direction in which this red light is diffracted is such that it satisfies the geometrical conditions requisite for retro-reflection by retro-reflector 10 to occur.
  • the red light is retro-reflected by the retro-reflector 10 in a direction (as indicated by arrow B R ) that is parallel to the direction of arrow A R .
  • the reflected red light then impinges back upon the stack 11 of holographic diffraction devices from behind and, because the device 12 has the same effect on red light propagating through it in either direction, the red light is diffracted again causing it to emerge in the direction of arrow R parallel to the original direction of incidence of the white light as indicated by arrow I.
  • green and blue wavelengths from the incident white light are not affected by the device 12 and, because the devices 13 and 14 are de-activated at this time, they pass straight through the stack 11 and impinge upon the front aperture 16 of the retro-reflector 10 in a direction (indicated by arrow C) that does not satisfy the requisite geometric conditions for retro-reflection. (This is also the case for zero order diffracted red light). As a consequence, the green and blue wavelengths are lost to the system, and in particular do not emerge from the overall device in the direction of arrow R. It will thus be apparent that in the above-described mode of operation, only red wavelengths are retro-reflected by the overall device.
  • Figure 2 shows a second embodiment of the optical retro-reflection device, which operates in exactly the same manner as the embodiment of Figure 1, but which comprises an array of retro-reflectors lOa-d, each of which has its own stack 1 la-d of holographic diffraction devices.
  • control circuit 15 operation of these diffraction devices is controlled by the control circuit 15 such that all of the "red” devices 12a-d, are activated together, all of the “green” devices 13a-d are activated together, and all of the “blue” devices 14a-d are activated together.
  • the overall device retro-reflects only red, green or blue wavelengths.
  • the control circuit 15 activates the holographic diffraction devices in different combinations, so that different parts of the overall device respectively retro-reflect red, green and blue wavelengths at any given time. Such an arrangement would find a particular benefit when applied to reconfigurable displays, such as road information signs.
  • each of the stacks of holographic diffraction devices can overlay a respective group of the retro- reflectors lOa-d.
  • the retro-reflector 10 instead of a cube corner prism or an array of such prisms, can also be an element composed of three orthogonally arranged plane reflectors, or an array of such elements.
  • FIG. 3 A third embodiment of the optical retro-reflection device is shown in Figure 3. This embodiment is similar to the embodiment of Figure 1 , and accordingly similar parts have been accorded the same reference numerals.
  • the retro-reflector 10 now comprises an array of micro-prisms each of which is in the form of a cube corner.
  • the retro-reflector 10 can comprise an array of micro-spheres. In either configuration, a single stack 11 of the holographic diffraction devices overlays the whole of the retro-reflector 10.
  • the retroreflector 10 again comprises an array of micro-prisms or micro-spheres.
  • a plurality of stacks 1 la-d of holographic diffraction devices are now provided, each of which overlays a respective area of the retro-reflector 10.
  • the individual "red" devices 12a-d in the various stacks can be activated in unison by the control circuit 15, such that red wavelengths are retro-reflected over the whole of the overall device at the same time, and similarly with the individual "green” devices 13 a-d and "blue” devices 14a-d.
  • the control circuit 15 can activate these devices in different combinations such that, at any given time, a first part of the overall device retro-reflects red wavelengths, a second part retro-reflects green wavelengths and a third part retro-reflects blue wavelengths.
  • the retro-reflector 10 has been described as a cube corner prism, orthogonally arranged plane reflectors, an array of micro-prisms and an array of micro-spheres.
  • the retro-reflector 10 can take any convenient form and can alternatively comprise any other type of retro-reflective optical element or screen material.
  • FIG. 5 A fifth embodiment of the invention is shown in Figure 5, in which the overall retro-reflection device is generally in the form of three orthogonally-arranged reflection devices 20R, 20G and 20B which form a cube corner.
  • the device 20R is composed of a holographic diffraction device 21R and a filter 22R that is disposed on a front surface of the diffraction device, with respect to the direction of light incidence.
  • the holographic diffraction device 21R comprises essentially a reflection hologram that is designed to reflect diffractively light of a predetermined wavelength band in the red region of be visible spectrum.
  • the filter 22R takes the form of a dichroic interference filter which is operative to transmit wavelengths corresponding to (or falling within) the bandwidth acted upon by the device 21R.
  • a dichroic interference filter is one that reflects one or more optical bands or wavelengths and transmits others, while maintaining a nearly zero coefficient of absorption for all wavelengths of interest.
  • a dichroic filter may be high- pass, low-pass, band-pass, or band rejection. In this application, it would preferably be a band-pass.
  • a light-absorbing element 23R is disposed on the opposite surface of the device 21R.
  • the reflection device 20G similarly comprises a holographic diffraction device 21G, a dichroic filter 22G and a light-absorbing element 23 G, while the reflection device 20B is composed of a holographic diffraction device 2 IB, a dichroic filter 22B and a light-absorbing element 23B.
  • the device 21 G (which is again in the form of a reflection-type hologram) and the filter 22G are designed to act only on green wavelengths
  • the device 21B also in the form of a reflection-type hologram
  • the filter 22B are designed to act only on blue wavelengths.
  • a control circuit 24 between an active, diffracting state and an inactive, non-diffracting state. Switching between states is performed by applying an electric field to the diffraction devices by way of electrodes (not shown), which serves effectively to erase the respective hologram so long as the electric field is maintained.
  • the control circuit 24 operates such that, when any one of the devices 21R, 21G and 2 IB is activated, the other two devices are de-activated.
  • the holographic diffraction device takes essentially the same form as that described for the pervious embodiment except that the holograms are now reflective rather than transmissive. The operation of the device shown in Figure 5 will now be described in detail.
  • the green component When the above-mentioned green and blue components are incident upon the reflection device 20G, the green component is transmitted by the filter 22G while the blue component is reflected by the filter. The green component then passes on to the holographic diffraction device 21G, but because the latter is de- activated the green component passes straight through and is then absorbed by the element 23G.
  • the blue light component When the blue light component is incident upon the reflection device 20B, it is transmitted through the filter 22B and is incident upon the holographic diffraction device 21B. Because the device 21B is activated at this time, the blue light is diffractively reflected by the latter and passes again through the filter 22B, and thereafter is emitted from the overall device in the direction of the arrow R. Thus, although white light is initially incident upon the overall device, only blue wavelengths are re-emitted.
  • the operation is analogous to that described above, but with the red and blue components being reflected by the device 20G and the blue component alone being subsequently reflected by the device 20R.
  • the filter 22G reflects the blue component while the green component passes there through and on to the holographic diffraction device 21G. Because this device is deactivated at this time, the green component passes through this also and is absorbed by the element 23G. As a result, only the blue component of the light is re-emitted by the overall device.
  • the operation is analogous to that described above except that red and blue wavelengths are reflected by the device 20G and again by the device 20B, with the red wavelengths subsequently being absorbed by the device 20R.
  • the red and green wavelengths are reflected by the filter 22B while the blue wavelengths pass there through and on to the holographic diffraction device 2 IB. Because this device is activated, the blue wavelengths are then diffractively reflected thereby and pass back through the filter 22B to emerge in the same direction as the red and green wavelengths. As a consequence, all three of the red, green and blue components are reflected by the device 20B.
  • the red component is absorbed by the device. 20R and the blue and green components are reflected thereby. Subsequently to this, device 20G absorbs the green component while the blue component is reflected. In the case where these reflection devices are encountered in the order 20G, 20R the green component is absorbed by the device 20G and the red and blue components are reflected thereby. Subsequent to this, device 20R absorbs the red component while the blue component is reflected thereby. In either case, only blue wavelengths are re-emitted after retro- reflection by the overall device.
  • the overall device is operative to retro-reflect only blue wavelengths when the holographic diffraction device 2 IB is activated.
  • the overall device will be operative to retro-reflect only red or green light when the holographic diffraction devices 21R and 21 G are respectively activated.
  • the holographic diffraction devices 21R, 2 IB and 21G are each essentially in the form of a reflection-type hologram. It is well known that such holograms have a relatively narrow bandpass (typically a few tens of nanometers), whereas transmission-type holograms have a much broader bandpass (usually in the region of 100 to 156 nanometers).
  • each of these from a stack of holographic diffraction elements having respective different bandpass characteristics.
  • Each of these elements acts essentially as a narrow bandpass filter, and the overall bandpass characteristics of the stack will be the additive combination of the individual bandpasses of the separate elements.
  • it is preferred that all of the elements in each stack are switchable by means of a common pair of electrodes. If a separate pair of electrodes were employed for each of the holographic diffraction elements, this would introduce significant transmission losses.
  • the reflection devices 20R, 20G and 20B have been described as being orthogonally arranged.
  • the affected device(s) are provided with a Fresnel lens or Fresnel prism (designated generally as 30) to compensate for its aforesaid deviation.
  • the Fresnel lens is of generally circular or curved form, whereas in Figure 7 it is of a linear form.
  • a detailed illustration of the Fresnel lens arrangement is shown in Figure 8 for the reflection device 20R, but its application to the devices 20G and/or 20B will be the same.
  • the Fresnel lens 30 underlies the filter 22R, which is provided as a coating on a front surface of the lens 30.
  • Green or blue wavelengths that are incident upon the device 20R (as indicated by arrow X) will be reflected by the filter 22R in the direction of arrow Y.
  • the angle of incidence will equal the angle of reflection.
  • red wavelengths that impinge upon the device 20R in the direction of arrow X will be transmitted through the filter 22R and will then pass onto the holographic diffraction device 21R after refraction by the Fresnel lens 30.
  • the red wavelengths will simply be absorbed by the element 23R.
  • the red wavelengths will be diffractively reflected back to the Fresnel lens, refracted once again by the lens, and then transmitted back through the filter 22R to emerge (as indicated by arrow Z) in the same direction as the reflected green and blue wavelengths.
  • the optical retro-reflection devices described above in relation to Figures 1 , 2 and 5 through 7 are based on retro-reflectors that essentially comprise cube corners. Using such an arrangement, it is possible to achieve a variety of configurations for the front aperture (16, Figure 1) (25, Figure 5) including circular, rectangular, square or triangular forms.
  • the optimum geometry will be based on consideration of the required effective aperture, which is determined by the desired variation of retro-reflection efficiency with angle.
  • the size of the front aperture (16, Figure 1) (25, Figure 5) will range from a few millimeters to several inches.
  • a patch of light is incident upon the overall device in such a direction that it is aimed at the corner point between the orthogonal reflectors. Because of the nature of the light source, some of the light will always be contained within the range of incidence angles required for retro-reflection. However, it is possible to augment the above-described constructions with additional optical elements (such as lenticular lens arrays) in order to increase the range of incidence angles over which light will be retro-reflected.
  • optical retro-reflection devices described above have many and varied applications. Reference has already been made to the device of Figure 2 finding a particular application in reconf ⁇ gurable displays, such as road information signs. However, it is possible to use the devices in many other areas, such as (for example) in robotics or in laser instrumentation. In addition, it is possible to use the device for signaling purposes by varying the electric field applied to one or more of the holograms in order to modulate toe retro-reflected light.
  • the holographic diffraction devices operate with wavelengths other than those of red, green and blue light, and indeed more or less than three such devices can be provided.
  • the holographic diffraction devices instead of being activated individually, it is possible to arrange for the holographic diffraction devices to be activated in selected combinations. For example, by activating the "red” and “green” devices together, the overall device can be used to retro-reflect yellow light. It is also possible to use as the incident light a combination of separate monochromatic light sources (e.g. LED's or lasers) instead of a single white light source.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

L'invention concerne un appareil de rétroréflexion optique convenant pour des afficheurs pouvant être reprogrammés pour signaux d'autoroutes et d'autres applications. Dans un mode de réalisation préféré, cet appareil comprend un rétroréflecteur, tel qu'un prisme de forme trièdre trirectangle, trois réflecteurs plans disposés de manière orthogonale, ou une pluralité de ces derniers disposés de manière à former un groupement, ou un ensemble de micro-sphères ou de micro-prismes disposés de manière à former un trièdre trirectangle. Dans un mode de réalisation, un élément de diffraction holographique est placé entre une source de rayonnement, telle qu'une lumière visible et au moins un rétroréflecteur. Cet élément de diffraction est conçu pour un ou plusieurs dispositifs holographiques superposés dans lesquels des éléments holographiques prédéterminés sont stockés. Ces dispositifs diffractent une bande de longueur d'onde particulière de rayonnement (par exemple, une lumière visible rouge, bleue et verte). Ces dispositifs hologrammes peuvent être superposés et désactivés de manière sélective, de façon que la bande de longueur d'onde recherchée (ou la couleur) à diffracter soit sélectionnée. De cette manière, l'appareil rétroréfléchissant peut être conçu pour réfléchir ou retransmettre de la lumière d'une certaine couleur. Dans un second mode de réalisation, les rétroréflecteurs sont disposés de manière orthogonale et comprennent les éléments de diffraction. Les éléments de diffraction de chaque rétroréflecteurs sont programmés afin de diffracter (et, par conséquent, de réfléchir) une bande différente de longueur d'onde de lumière. Par conséquent, seulement les rétroréflecteurs activés réfléchiront (par diffraction) une portion de rayonnement incident et cette portion est, de préférence, de la lumière visible rouge, verte ou bleue.
PCT/US2000/032368 1999-11-23 2000-11-24 Dispositif de retroreflexion optique WO2001038906A2 (fr)

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Cited By (7)

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WO2006051496A2 (fr) * 2004-11-12 2006-05-18 Koninklijke Philips Electronics, N.V. Affichage réflectif polychrome à grande brillance
EP1531341A3 (fr) * 2003-11-17 2006-06-21 Raytheon Company Procédé pour identifier un object interrogé au moyen d'un système d'identification dynamique à étiquette d'identification optique
DE102007006405A1 (de) * 2007-02-05 2008-08-07 Imos Gubela Gmbh Reflektor mit einer Trapez-Reflexion und Verfahren für die Licht-Feinabtastung zur Erkennung eines Gegenstandes
EP2352042A1 (fr) * 2010-01-29 2011-08-03 Sony Corporation Élément optique et son procédé de fabrication
CN107121717A (zh) * 2017-05-27 2017-09-01 中国科学院上海技术物理研究所 一种复合角锥棱镜
WO2021208942A1 (fr) * 2020-04-17 2021-10-21 荆门市探梦科技有限公司 Film holographique géométrique réfléchissant basé sur un élément bidimensionnel, son procédé de préparation et son utilisation

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US7268340B2 (en) 2002-04-14 2007-09-11 Gubela Sr Hans-Erich Wide-angle sensor system with a cube corner reflector, and production of the molds
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EP1531341A3 (fr) * 2003-11-17 2006-06-21 Raytheon Company Procédé pour identifier un object interrogé au moyen d'un système d'identification dynamique à étiquette d'identification optique
WO2006051496A3 (fr) * 2004-11-12 2007-11-08 Koninkl Philips Electronics Nv Affichage réflectif polychrome à grande brillance
WO2006051496A2 (fr) * 2004-11-12 2006-05-18 Koninklijke Philips Electronics, N.V. Affichage réflectif polychrome à grande brillance
DE102007006405A1 (de) * 2007-02-05 2008-08-07 Imos Gubela Gmbh Reflektor mit einer Trapez-Reflexion und Verfahren für die Licht-Feinabtastung zur Erkennung eines Gegenstandes
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EP2352042A1 (fr) * 2010-01-29 2011-08-03 Sony Corporation Élément optique et son procédé de fabrication
US8199406B2 (en) 2010-01-29 2012-06-12 Sony Corporation Optical element and method for manufacturing the same
CN107121717A (zh) * 2017-05-27 2017-09-01 中国科学院上海技术物理研究所 一种复合角锥棱镜
CN107121717B (zh) * 2017-05-27 2019-07-23 中国科学院上海技术物理研究所 一种复合角锥棱镜
WO2021208942A1 (fr) * 2020-04-17 2021-10-21 荆门市探梦科技有限公司 Film holographique géométrique réfléchissant basé sur un élément bidimensionnel, son procédé de préparation et son utilisation

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