Classifications

• • G—PHYSICS
  • G02—OPTICS
  • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
  • G02C11/00—Non-optical adjuncts; Attachment thereof
• • 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
  • G02B27/017—Head mounted
  • G02B27/0172—Head mounted characterised by optical features
• • 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
  • G02B27/017—Head mounted
  • G02B27/0176—Head mounted characterised by mechanical features
• • G—PHYSICS
  • G02—OPTICS
  • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
  • G02C9/00—Attaching auxiliary optical parts
• • 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
  • G02B27/017—Head mounted
  • G02B2027/0178—Eyeglass type

Definitions

• the present invention relates to an ophthalmic lens intended to constitute an ophthalmic display comprising such a lens and an optical imager intended to allow the projection of information, of image or multimedia type.
• An optical system is called a "lens", which can in particular be positioned in a spectacle frame.
• a projection insert consists of an optical imager intended to shape the optical beams coming from an electronic and optical system for generating light beams from an electronic signal, of the miniature screen, laser diode, diode type. emitting.
• the optical imager directs the optical beams towards the wearer's eye to allow the visualization of the information content.
• Such a type of optical imager lens inserted into the lens poses the following technical problems.
• a non-corrective lens it is necessary to produce a lens of relatively large thickness, corresponding to the thickness of the optical imager.
• a corrective lens that is to say making it possible to also correct the wearer's vision
• Such a lens therefore proves to be heavy and unsightly.
• the invention solves this problem and, to do this, it proposes an ophthalmic lens intended to constitute an ophthalmic display, associated with an optical imager intended to shape optical beams and to direct them towards the eye of the wearer to allow visualization of an informational content, said optical imager being secured to said lens, characterized in that it is associated with a marking comprising a referencing of the position of said imager with respect to said lens as a function of correction parameters of said lens.
• the verb "to solidify" is to be considered in the strict sense, that is to say excludes insertion of the integration type by overmolding.
• the optical imager is of the same type as that described in patent US 5886822 already mentioned.
• lens As for the word “lens”, it relates in particular to a lens, corrective or not, intended to be mounted in a spectacle frame.
• This ophthalmic spectacle lens has traditional functions such as vision correction, anti-reflection, anti-fouling, anti-scratch, for example.
• lens is also understood a finished lens ready to be positioned on a frame or semi-finished lens, that is to say intended to undergo at least one treatment, for example surfacing, to be usable.
• Such a semi-finished lens has the properties of an ophthalmic semi-finished, namely that its rear face does not, in this semi-finished state, have any particular optical function but is intended to be surfaced, namely rough and polished , so as to obtain a finished ophthalmic lens providing the wearer's prescription for environmental vision.
• This marking may consist of an etching on the lens, of a stamping on the lens or of a support carrying this marking of the label type associated with one or more lenses.
• said referencing is carried out with respect to a virtual theoretical eye center.
• said marking comprises the position of the far vision point and information for defining said virtual theoretical eye center.
• the information for defining the virtual theoretical eye center is the value of the curve angle of the wearer's frame, the value of the panthoscopic angle of the wearer's frame, and a distance, corresponding to the distance between the lens. and the center of the wearer's eye.
• Said marking can comprise the guiding cosines of an informational gaze line corresponding to the straight line passing through said virtual theoretical ocular center and the center of the image obtained by means of the optical imager, in a reference point related to the glass.
• This informational line of sight is such that it must be perceived by the wearer. Its position is therefore arbitrarily chosen in the visual space of the wearer, in a reference to the glass.
• Said marking can also include a power compensation value to be provided by the imager.
• the lens according to the invention may have securing means making it possible to ensure compliance with the positioning of said optical imager, as indicated by said marking.
• the invention also relates to an ophthalmic display comprising an ophthalmic lens as specified above. Preferably, the position of said imager with respect to said lens is referenced as a function of correction parameters of said lens.
• Figure 1 is a top view of an optical imager used in accordance with the invention, with its associated electronic and optical system.
• Figure 2 is a top view of a wearer provided with a spectacle frame supporting an ophthalmic device according to a preferred embodiment of the invention.
• Figure 3 is a front view of a lens according to a preferred embodiment of the invention.
• Figure 4 is a top view of an ophthalmic device according to a preferred embodiment of the invention.
• Figure 5 is a side view illustrating an example of referencing according to the invention, in the case of a single-focus ophthalmic lens.
• An example of an imager as used according to the invention is represented in its environment in FIG. 1.
• An electronic signal carrying information is brought to a miniature screen 1 by a cable 7.
• the miniature screen 1 lit by a background projector 2, generates a pixelated image corresponding to the information.
• a “KOPIN Cyberdisplay 320 color” screen can be used, generating images of 320 x 240 pixels and a size of 4.8 mm x 3.6 mm.
• the screen 1 is referenced by means of a mechanical interface 3 with respect to the optical imager 5.
• a protective shell 4 protects all or part of the assembly.
• This optical imager 5 here consists of a propagation prism 5a, a counter-prism 5b, a quarter-wave plate 5c and a light mirror.
• a spherical Mangin mirror is a planphospheric lens for which the spherical face has been made reflective by means of an aluminized or equivalent treatment.
• the imager 5 also includes a polarization separator treatment 6 which can be produced in the form of depositing thin layers, either on the propagation prism 5a, or on the counter-prism 5b, or by means of a film bonded between the two elements mentioned above. The operation of this assembly is as follows. A light beam coming from the miniature screen 1 crosses the propagation prism 5a and arrives on the polarization separator processing 6.
• the polarization of the light beam emitted by this screen 1 is oriented so that it is located in the plane of incidence of light rays on the polarization splitter treatment 6. It is said to be oriented in the direction P. It is therefore transmitted by treatment 6 with very good photometric efficiency.
• the light beam then propagates through the counter-prism 5b, then reaches the quarter-wave plate 5c, then the Mangin mirror 5d on which it is reflected to cross the quarter-wave plate in the opposite direction.
• the Mangin 5d mirror has the role of producing an enlarged image of the screen as well as of positioning it so that it is at a comfortable viewing distance for the user.
• this viewing distance has been adjusted so that, in the end, the image appears to the user as if it were within 1 m of them.
• the apparent size of the image can be of the order of 12 ° on the diagonal, depending on the characteristics of the imager.
• the quarter wave plate 5c has its axes oriented at 45 degrees from the polarization of the light beam. As a result of the first crossing of the light beam, it emerges with a state of circular polarization. Finally, at the end of the second crossing, the beam has a state of linear polarization, but oriented at 90 ° from its initial polarization.
• an optical imager as described above is secured to a lens 10 as shown in FIG. 2.
• a frame 12 On a frame 12 are mounted two ophthalmic lenses 10 and 11, one of which carries the optical imager 5 for form an ophthalmic device according to the invention.
• the electronic information reader 13 is connected to the connecting cable 7.
• This electronic reader may in particular include a control unit making it possible to switch on the miniature screen and to carry out most of the adjustments concerning the brightness, the color, the power supply of the miniature screen by battery, management controls.
• This box can contain a card or an electronic chip making it possible to convert the electronic signal coming from a source of informational content, into a signal exploitable by the miniature screen.
• the information can come, for example, from a personal computer, a DVD player, an organizer, a telephone, a game console.
• the imager optical 5 is secured to the front face of the lens 10 by direct fixing. According to a variant, the optical imager 5 can be fixed on the rear face of the lens.
• the optical imager 5 can be in contact or not with the lens, pass through it partially or completely. It can also be fixed indirectly, thanks to the interposition of an intermediate piece, an extension of the imager, an extension of the lens, or even the mechanical interface 3.
• the optical imager can be fixed to the lens by gluing and therefore cannot be removed. According to the invention, it can also be fixed in a removable manner, for example by shape blocking or screwing.
• Figures 3 and 4 show a preferred embodiment.
• On the lens 10 is arranged a groove 10A intended to receive the optical imager 5 as shown in FIG. 4.
• the groove 10A is designed in a shape complementary to that of the imager 5, here substantially parallelepiped.
• the lens 10 is here an ophthalmic glass made of transparent optical material, for example glass or polymeric plastic.
• He has a marking whose functionality is similar to that of a conventional ophthalmic lens, called "ophthalmic marking".
• the glass here consists of two bonded elements.
• These two lenses 10B and 10C are centered, their respective optical axis being merged into the axis AA 'and bonded to their respective flat surface.
• the total power of the ophthalmic lens thus obtained is equal to Pcx + Pcc.
• this lens 10 can also be produced by injection molding in a single piece of plastic. In this exemplary embodiment, as visible in FIG.
• the position of the groove 10A is referenced with respect to a direct orthonormal coordinate system (x, y, A-A '), called opto-mechanical coordinate system, centered on the two lenses 10B and 10C.
• the optical imager 5 is glued, or blocked by complementary shape, in this groove 10A and the opto-mechanical marking is chosen so that the optical axis of exit of the optical imager 5 passes through the optical center of the glass. ophthalmic and be confused with the optical axis of the ophthalmic lens A-A '.
• the bottom surface of the groove 10A is perpendicular to the optical axis A-A '.
• ophthalmic lenses which may also be aspherical of revolution, anamorphic or progressive aspherical, a particular orientation of the lenses is chosen.
• axes of the Oxy coordinate system relative to the properties of the lens axes of the tori, meridian, etc.
• a particular point as the origin intersection of the axes, VL, VP, mounting cross . All these points and axes can themselves be referenced in relation to the outside diameter of the lens or in relation to a marking on the lens. This operation is carried out at the time of manufacture of the lens.
• the assembly of the complete ophthalmic device is done in three main stages: the first stage consists in trimming the ophthalmic lens in the format of the frame, the second stage consists in assembling the ophthalmic lens 10 and the imager 5, the third stage consists in mounting the contoured ophthalmic lens in the frame
• the last two steps can optionally be carried out in any order.
• the first step of trimming the ophthalmic lens 10 can be done by means of a grinder usually used by an optician, for example a grinder of the "Essilor Kappa" type.
• the same mounting in the frame is classic. Thanks to the display according to the invention, it is possible to correct the view of the informative image by modifying its proximity.
• the optical imager 5 can be removable.
• FIG. 5 represents a side view of an example of referencing in the case of a single-hearth glass.
• a single-focus ophthalmic lens has conventional ophthalmic marking.
• this marking includes the position of the “far vision point” VLSF and the data making it possible to construct the “virtual theoretical eye center” COTV which corresponds substantially to the center of the eye of the wearer.
• This far vision point VLSF can be defined at a distance from the boxing line BB ′ of the glass comprised between 0 mm and 4 mm and be defined on the front face and / or the rear face of the glass.
• the informational line of sight D which corresponds to the straight line passing through the virtual theoretical eyepiece COTV and the center of the image I obtained by means of the optical imager 5 is then inclined downwards by an angle of 8 ° equal to the panthoscopic angle ⁇ . So when the eye wants to look at the informative image, it directs itself by turning in its orbit downwards by describing an arc of approximately 8 °.
• the optical imager 5 is aligned with the informational line of sight of the system which is merged here with the optical axis of exit of the optical imager 5.
• the groove formed in the glass and housing the optical imager 5 is such that the latter rests on a flat base and perpendicular to the optical axis of the ophthalmic lens.
• the optical axis of output from the optical imager is not deflected by the ophthalmic lens. It thus corresponds to the line of sight of the observer, which allows him to visualize the informative content provided by the optical imager under optimal conditions.
• the power of the ophthalmic lens' brought on the information channel which is here equal to the optical power of its rear face, it is easy to determine the focus compensation to be carried out at the imager, in order to allow the correction of the wearer's sight both for his environment and for the informational vision.
• the referencing can be done in a similar way to that already described for a single focus lens by considering here the far vision point VL.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Health & Medical Sciences (AREA)
• Ophthalmology & Optometry (AREA)
• Eyeglasses (AREA)
• Lenses (AREA)

Applications Claiming Priority (2)

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• 2004
  • 2004-02-18 FR FR0450294A patent/FR2866442B1/fr not_active Expired - Fee Related
• 2005
  • 2005-02-17 JP JP2006553631A patent/JP2007524871A/ja active Pending
  • 2005-02-17 US US10/589,313 patent/US8057033B2/en active Active
  • 2005-02-17 EP EP05717716A patent/EP1716445A1/de not_active Withdrawn
  • 2005-02-17 WO PCT/FR2005/050100 patent/WO2005081036A1/fr active Application Filing

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