WO2022068763A1 - Dispositif de projection et lunettes intelligentes - Google Patents

Dispositif de projection et lunettes intelligentes Download PDF

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Publication number
WO2022068763A1
WO2022068763A1 PCT/CN2021/120878 CN2021120878W WO2022068763A1 WO 2022068763 A1 WO2022068763 A1 WO 2022068763A1 CN 2021120878 W CN2021120878 W CN 2021120878W WO 2022068763 A1 WO2022068763 A1 WO 2022068763A1
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WIPO (PCT)
Prior art keywords
diffractive
lens
refractive
projection device
protrusions
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PCT/CN2021/120878
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English (en)
Chinese (zh)
Inventor
孔德卿
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维沃移动通信有限公司
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Publication of WO2022068763A1 publication Critical patent/WO2022068763A1/fr

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    • 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
    • G02B2027/0178—Eyeglass type

Definitions

  • the present application belongs to the technical field of communication equipment, and in particular relates to a projection device and smart glasses.
  • the smart glasses can project a virtual image through the projection device configured by themselves, so that the user can see the virtual image.
  • the projection device of the current smart glasses includes a large number of lenses to balance or eliminate the chromatic aberration generated during the projection process, thereby improving the accuracy of light modulation.
  • using a larger number of lenses to eliminate chromatic aberration will lead to a larger volume of the projection device, which will lead to a larger size and weight of the smart glasses, and ultimately lead to a relatively bulky smart glasses. Obviously, this will lead to a poor wearing experience for the user.
  • the purpose of the embodiments of the present application is to provide a projection device and smart glasses, which can solve the problem that the user's wearing experience is poor due to the large size and weight of the smart glasses.
  • an embodiment of the present application discloses a projection device including a display screen and a first lens mechanism, wherein the first lens mechanism includes a first refractive diffractive lens and a second refractive diffractive lens, which is perpendicular to the display screen and Towards the direction away from the display screen, the display screen, the first-fold diffractive lens and the second-fold diffraction lens are arranged in sequence, and the light emitted by the display screen passes through the first-fold diffraction lens and the second-fold diffraction lens in sequence.
  • the second refractive diffractive lens is emitted.
  • the present application discloses smart glasses.
  • the disclosed smart glasses include a glasses body and the above-mentioned projection device.
  • the glasses body includes a spectacle lens, and the spectacle lens is opposite to the projection device, and the display screen projects The light can be projected onto the spectacle lenses after passing through the first lens mechanism.
  • the projection device disclosed in the embodiment of the present application improves the structure of the projection device described in the background art, so that the first lens mechanism includes a first folded diffractive lens and a second folded diffractive lens, and the light emitted from the display screen passes through the first folded diffractive lens.
  • the first lens mechanism includes a first folded diffractive lens and a second folded diffractive lens
  • the light emitted from the display screen passes through the first folded diffractive lens.
  • both the first refractive diffractive lens and the second refractive diffractive lens can offset the chromatic aberration caused by light diffraction and the chromatic aberration generated by refraction, so that the projection device does not need to be additionally configured to eliminate chromatic aberration.
  • this structure enables the projection device not only to eliminate chromatic aberration and ensure the projection quality, but also to reduce the number of lenses of the projection device and the length of the optical path, thereby reducing the size of the projection device and at the same time reducing the size of the projection device. the weight of. This can make the quality and volume of the smart glasses equipped with the projection device smaller, thereby improving the wearing experience of the smart glasses.
  • the embossed rubber layer can reduce the difference in the refractive index of the diffractive surface between the first refractive diffractive lens and the second refractive diffractive lens, so that the refractive index can be improved. efficiency.
  • FIG. 1 is a schematic structural diagram of a projection device disclosed in an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of another projection device disclosed in an embodiment of the present application.
  • FIG. 3 is a partial structural schematic diagram of a first lens mechanism disclosed in an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of the smart glasses disclosed in an embodiment of the present application.
  • 300-first lens mechanism 310-first refractive diffractive lens, 311-first base layer, 311a-first surface, 311b-second surface, 311c-third surface, 312-first diffraction protrusion, 320-first Two-fold diffractive lens, 321-second base layer, 321a-fourth surface, 321b-fifth surface, 321c-sixth surface, 322-second diffractive protrusion, 330-embossing glue layer;
  • 500-glasses body 500-glasses body, 510-glass legs, 520-glasses frame, 530-glasses, 540-diffraction waveguide, 541-incidence grating, 542-reflection grating, 543-exit grating;
  • first, second and the like in the description and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in sequences other than those illustrated or described herein, and distinguish between “first”, “second”, etc.
  • the objects are usually of one type, and the number of objects is not limited.
  • the first object may be one or more than one.
  • “and/or” in the description and claims indicates at least one of the connected objects, and the character “/" generally indicates that the associated objects are in an "or” relationship.
  • an embodiment of the present application discloses a projection device 400 .
  • the disclosed projection device 400 can be applied to smart glasses.
  • the disclosed projection device 400 includes a display screen 100 and a first lens mechanism 300 .
  • the display screen 100 is a light projection device of the projection apparatus 400 .
  • the display screen 100 may be LCOS (Liquid Crystal on Silicon, liquid crystal on silicon, also called liquid crystal on silicon), which is a very small-sized matrix liquid crystal display device.
  • the display screen 100 may be an OLED (Organic Light-Emitting Diode, organic light-emitting semiconductor), and the display screen 100 may also be a MicroLED (Micro Light Emitting Diode, micro light-emitting diode).
  • OLED Organic Light-Emitting Diode, organic light-emitting semiconductor
  • MicroLED Micro Light Emitting Diode, micro light-emitting diode
  • the embodiment of the present application does not limit the specific type of the display screen 100.
  • the first lens mechanism 300 is a light distribution device.
  • the first lens mechanism 300 is disposed opposite to the display screen 100.
  • the first lens mechanism 300 can adjust the light projected by the display screen 100 so that it becomes collimated light and exits, thereby improving the projection. Effect.
  • the first lens mechanism 300 includes a refracting and diffractive lens, and the refracting and diffractive lens can refract and diffract the light projected by the display screen 100, and then achieve the purpose of collimation through refracting and diffracting.
  • the light projected by the display screen 100 passes through the first lens mechanism 300 and is projected on the projected component, thereby forming a virtual image on the projected component, so that the user can see the virtual image, wherein,
  • the projected component may be a projected wall, a projected screen, a spectacle lens of smart glasses, etc.
  • the embodiment of the present application does not limit the specific type of the projected component.
  • the first lens mechanism 300 may include a first folded diffractive lens 310 and a second folded diffractive lens 320. In a direction perpendicular to the display screen 100 and away from the display screen 100, the display screen 100, the first The refractive diffractive lens 310 and the second refractive diffractive lens 320 are arranged in sequence.
  • the light emitted by the display screen 100 is emitted through the first refractive diffractive lens 310 and the second refractive diffractive lens 320 in sequence.
  • Refraction and diffraction according to the principle of refraction and diffraction, both refraction and diffraction of light will produce chromatic aberration.
  • the first-fold diffractive lens 310 can not only refract light, but also diffract light, the chromatic aberration caused by the diffraction of light by the first-fold diffractive lens 310 and the chromatic aberration caused by refraction of light will cancel each other out, so as to alleviate the It can even eliminate the chromatic aberration caused by the light during the projection process, thereby improving the projection quality.
  • the projection device 400 disclosed in this embodiment of the present application improves the structure of the projection device described in the background art, so that the first lens mechanism 300 includes a first folded diffractive mirror 310 and a second folded diffractive mirror 320 .
  • the first lens mechanism 300 includes a first folded diffractive mirror 310 and a second folded diffractive mirror 320 .
  • both the first-refractive diffractive lens 310 and the second-refractive diffractive lens 320 can make the chromatic aberration generated by diffraction of the light and the chromatic aberration generated by refraction cancel each other out, thereby making the projection possible.
  • the device 400 does not need to be additionally configured with multiple lenses for eliminating chromatic aberration.
  • This structure enables the projection device 400 to eliminate chromatic aberration and ensure the projection quality, while reducing the number of lenses in the projection device 400 and reducing the length of the optical path.
  • the size of the projection apparatus 400 is reduced, and the weight of the projection apparatus 400 can also be reduced. This can make the quality and volume of the smart glasses equipped with the projection device 400 smaller, thereby improving the wearing experience of the smart glasses.
  • the projection device 400 disclosed in the embodiment of the present application is beneficial to realize the miniaturization of the projection device, and further facilitates the installation in other devices.
  • the first-fold diffractive mirror 310 and the second-fold diffraction mirror 320 cooperate with each other to realize multi-layer diffraction, which can further improve the diffraction efficiency. Since both the first-fold diffraction mirror 310 and the second-fold diffraction mirror 320 can play To eliminate chromatic aberration, the first-fold diffractive lens 310 and the second-fold diffractive lens 320 cooperate with each other, so that the effect of eliminating chromatic aberration can be better played.
  • the projection apparatus disclosed in the embodiments of the present application may further include a casing 600 , the display screen 100 may be disposed in the casing 600 , the first lens mechanism 300 may be disposed at least partially in the casing 600 , and the casing 600 can realize the display screen 100 With the installation of the first lens mechanism 300 , at the same time, the housing 600 can prevent the light projected by the display screen 100 from being affected by other stray light before passing through the first lens mechanism 300 .
  • the housing 600 also facilitates the overall installation of the projection device 400 .
  • the housing 600 may be fixed on the temples 510 of the smart glasses, so as to realize the installation of the projection apparatus 400 on the temples 510 .
  • the first refractive diffractive lens 310 and the second refractive diffractive lens 320 both have diffractive structures, and the diffractive structures can play a role in diffracting light.
  • the first fold diffractive mirror 310 may have a first diffraction structure
  • the second fold diffraction mirror 320 may have a second diffraction structure.
  • the first diffractive structure may be located on one side of the first fold diffractive lens 310, and the second diffractive structure may be located on one side of the second fold diffractive lens 320.
  • the first diffractive structure may be located inside the first fold diffractive mirror 310
  • the second diffraction structure may also be located inside the second fold diffractive mirror 320 .
  • the embodiment of the present application does not limit the first diffraction structure to be located in the first fold diffractive mirror 310 .
  • the embodiment of the present application does not limit the specific position of the second diffractive structure on the second refractive diffractive lens 320 either.
  • the first diffractive structure and the second diffractive structure are located on opposite sides of the first folded diffractive mirror 310 and the second folded diffractive mirror 320, respectively.
  • the protection of the two-diffraction structure avoids wear, bumps, etc.
  • the first lens mechanism 300 may further include an embossed adhesive layer 330, specifically, the embossed adhesive layer 330 may be disposed between the first refractive diffractive lens 310 and the second refractive diffractive lens 320.
  • the refractive diffractive lens 310 and the second refractive diffractive lens 320 are connected through the embossing glue layer 330 .
  • the embossed rubber layer 330 can form the first-fold diffractive lens 310 and the second-fold diffractive lens 320 into a whole, thereby facilitating the integral installation in the camera device.
  • the embossing adhesive layer 330 may be a UV-curable embossing adhesive or a thermosetting embossing adhesive.
  • the embodiment of the present application does not limit the specific type of the embossing adhesive layer 330 .
  • the embossed adhesive layer 330 is an optical embossed adhesive layer, and the embossed adhesive layer 330 can be made by embossing between the first refractive diffractive lens 310 and the second refractive diffractive lens 320 .
  • the molding method of the embossed rubber layer 330 has the advantages of low material cost and less technical difficulty, so that the manufacturing method of the embossed rubber layer 330 has strong operability and is suitable for mass production.
  • the embossed rubber layer 330 is formed by embossing between the first folded diffractive lens 310 and the second folded diffractive lens 320, which can more effectively avoid the embossed rubber layer 330, the first folded diffractive lens 310 and the second folded diffractive lens 320.
  • the phenomenon of falling off or warping caused by different thermal expansion coefficients after the bi-fold diffractive lenses 320 are connected in sequence.
  • the embossed adhesive layer 330 can be a refractive index compensation layer, which can reduce the difference between the refractive indices of the diffractive surfaces of the first folded diffractive mirror 310 , thereby reducing the manufacturing process of the first folded diffraction mirror 310 It is difficult to improve the diffraction efficiency.
  • the light that is optimally adjusted by the first-fold diffraction lens 310 and the embossed rubber layer 330 enters the second-fold diffraction lens 320 at a suitable angle, and the second-fold diffraction lens 320 again refracts the light.
  • the chromatic aberration caused by the diffraction of light by the second refractive diffractive lens 320 and the chromatic aberration caused by the refraction of the light will cancel each other, so that the chromatic aberration caused by the light during the projection process can be eliminated, and the projection quality can be further improved.
  • the thickness hi of the embossed adhesive layer 330 may be greater than 5 ⁇ m and less than 500 ⁇ m. After testing, this thickness range enables the embossed adhesive layer 330 to have a better refraction effect.
  • the refractive index ni of the embossing rubber layer 330 may be greater than 1.3 RIU and less than 1.9 RIU. After testing, the embossed adhesive layer 330 in this refractive index range can play a better compensation role.
  • the materials of the first-refractive diffractive lens 310 and the second-refractive diffractive lens 320 can be various.
  • the first-refractive diffractive lens 310 and the second-refractive diffractive lens 320 can be made of It is made of glass material.
  • the first refractive diffractive lens 310 and the second refractive diffractive lens 320 are glass structural parts.
  • the first refractive diffractive lens 310 and the second refractive diffractive lens 320 may be made of optical plastics.
  • the first refractive diffractive lens 310 and the second refractive diffractive lens 320 are
  • the optical plastic structural member is light in weight, which is beneficial to reduce the mass of the first refracting diffractive lens 310 , which in turn helps to reduce the mass of the projection device 400 .
  • the optical plastic structural parts can be processed by injection molding, which makes the processing of the first refractive diffractive lens 310 and the second refractive diffractive lens 320 relatively simple, and is more suitable for mass production, and the processing cost is relatively high. Low.
  • there can be various optical plastics such as PC (Polycarbonate, polycarbonate), COC (Cyclic Oleflns Copolymet, cyclic olefin copolymer), COP (Cycio Olefins Polymer, cyclic olefin polymer), etc.
  • the specific types of optical plastics are not specifically limited in the embodiments of the present application.
  • the first lens mechanism 300 can achieve an optimal diffraction effect by adjusting the refractive indices of the first refractive diffractive lens 310 , the second refractive diffractive lens 320 and the embossed rubber layer 330 .
  • the refractive index can be determined by selecting the thickness and material of the first-fold diffractive mirror 310, the second-fold diffraction mirror 320, and the embossed rubber layer 330.
  • the first-fold diffraction mirror 310 has a The refractive index n p1 can be greater than 1.3RIU and less than 1.8RIU (RIU, Refractive index unit, refractive index unit).
  • the first refractive diffractive lens 310 in this refractive index range can obtain better refraction when light passes through Therefore, the chromatic aberration caused by refraction can better offset the chromatic aberration caused by diffraction, and finally a better projection quality can be obtained.
  • the refractive index n p2 of the second refractive diffractive lens 320 may be greater than 1.3 RIU and less than 1.8 RIU.
  • the second refractive diffractive lens 320 in this refractive index range can obtain better refraction when light passes through. Therefore, the chromatic aberration caused by refraction can better offset the chromatic aberration caused by diffraction, and finally a better projection quality can be obtained.
  • the first refractive diffractive mirror 310 may include a plurality of concentrically arranged first diffraction protrusions 312 , and the plurality of concentrically arranged first diffraction projections 312 form a first diffraction structure of the first refractive diffraction mirror 310 .
  • the first folded diffractive lens 310 When the ambient light passes through the first folded diffractive lens 310 , it is first refracted through the first refracting surface (which can be considered as the surface of the first folded diffractive lens 310 facing away from the first diffraction protrusion 312 ), and then passes through the first diffraction protrusion 312 for refraction. Diffraction, and then achieve the purpose of mutual cancellation of chromatic aberration caused by refraction and diffraction.
  • the distance between the tops of the two adjacent first diffractive protrusions 312 ie the period ⁇ 1 of the first diffractive structure
  • the period ⁇ 1 of the first diffractive structure is from the center of the first diffractive structure to the first diffractive structure.
  • the edges of a diffractive structure gradually decrease.
  • the plurality of first diffractive protrusions 312 include annular protrusions arranged concentrically. Such an arrangement can make the area close to the edge of the first refractive diffractive lens 310 have a better diffraction effect.
  • the second refractive diffractive lens 320 may include a plurality of concentrically arranged second diffractive protrusions 322 . During the process of light passing through the second diffractive protrusions 322 , diffraction and refraction phenomena may occur to the light. A plurality of concentrically arranged second diffractive protrusions 322 form a second diffractive structure of the second refractive diffractive lens 320 .
  • the ambient light passes through the second diffractive lens 320, it is diffracted by the second diffractive protrusion 322 first, and then passes through the second refractive surface (it can be considered as the surface of the second diffractive lens 320 facing away from the second diffractive protrusion 322) Refraction, and then achieve the purpose of mutual cancellation of chromatic aberration caused by refraction and diffraction.
  • the second refractive diffractive lens 320 has a zigzag structure.
  • the distance between the tops of the two adjacent second diffractive protrusions 322 ie the period ⁇ 2 of the second diffractive structure
  • the period ⁇ 2 of the second diffractive structure goes from the center of the second diffractive structure to The edge of the second diffractive structure gradually decreases.
  • the plurality of second diffractive protrusions 322 include annular protrusions arranged concentrically. Such an arrangement can make the area close to the edge of the second refractive diffractive lens 320 have a better diffraction effect.
  • the distance between the top ends of two adjacent first diffractive protrusions 312 may be greater than 0.5 ⁇ m and less than 1.5 mm.
  • a diffractive protrusion 312 has a root and a top, the top of the first diffractive protrusion 312 is the top of the first diffractive protrusion 312 , and the root of the first diffractive protrusion 312 is the bottom of the first diffractive protrusion 312 .
  • the distance between the top ends of the two adjacent first diffractive protrusions 312 can better ensure the diffraction effect, which helps to offset the chromatic aberration caused by refraction caused by the chromatic aberration caused by diffraction.
  • the period ⁇ 1 of the first diffractive structure may be equal to the period ⁇ 2 of the second diffractive structure.
  • the height h d1 of the first diffractive protrusion 312 is greater than 0.1 ⁇ m and less than 50 ⁇ m. After testing, the height of the first diffractive protrusion 312 can better ensure the diffractive effect. It should be noted that the height of the first diffractive protrusion 312 refers to the dimension in the direction from the top to the top of the first diffractive protrusion 312 . Specifically, in the radial direction from the center of the first-fold diffractive mirror 310 away from the center, the heights of the first diffraction protrusions 312 decrease or increase. Of course, the heights of all the first diffraction protrusions 312 of the first-fold diffraction mirror 310 can be equal.
  • the distance between the tops of the two adjacent second diffractive protrusions 322 may be greater than 0.5 ⁇ m and less than 1.5 mm.
  • the second diffractive protrusions The protrusion 322 has a root and a top, the top of the second diffractive protrusion 322 is the top of the second diffractive protrusion 322 , and the root of the second diffractive protrusion 322 is the bottom of the second diffractive protrusion 322 .
  • the distance between the top ends of the two adjacent second diffractive protrusions 322 can better ensure the diffraction effect, which is helpful for offsetting the chromatic aberration caused by the diffraction to offset the chromatic aberration caused by the refraction.
  • the height h d2 of the second diffractive protrusion 322 is greater than 0.1 ⁇ m and less than 50 ⁇ m. After testing, the height of the second diffractive protrusion 322 can better ensure the diffractive effect. It should be noted that the height of the second diffractive protrusion 322 refers to the dimension in the direction from the top to the top of the second diffractive protrusion 322 . Specifically, in the radial direction from the center of the second-fold diffractive mirror 320 away from the center, the heights of the second diffractive projections 322 decrease or increase. Of course, the heights of all the second diffraction projections 322 of the second-fold diffraction mirror 320 can be equal.
  • the first diffractive protrusions 312 and the second diffractive protrusions 322 may be respectively disposed on the opposite surfaces of the first folded diffractive mirror 310 and the second folded diffraction mirror 320, and each of the first diffraction protrusions The top of the 312 is opposite to the top of each of the second diffractive protrusions 322 .
  • the first refractive diffractive lens 310 may further include a first base layer 311 , and the first diffractive protrusions 312 are disposed on the first base layer 311 .
  • the first base layer 311 can provide a foundation for the first diffractive protrusions 312, so that the first diffractive protrusions 312 have high strength and are not easily damaged.
  • the first base layer 311 also facilitates the formation of the first diffractive protrusions 312 .
  • the first base layer 311 is also a light-transmitting material, which needs to be able to ensure the passage of ambient light.
  • the material of the first base layer 311 is the same as the material of the first diffractive protrusions 312 , and both can be made of materials such as glass material, optical plastic, and the like.
  • the second folded diffractive lens 320 may further include a second base layer 321 , and the second diffractive protrusions 322 are disposed on the second base layer 321 .
  • the second base layer 321 can provide a foundation for the second diffractive protrusions 322 , so that the second diffractive protrusions 322 have high strength and are not easily damaged.
  • the second base layer 321 also facilitates the formation of the second diffractive protrusions 322 .
  • the second base layer 321 is also a light-transmitting material, which needs to be able to ensure the passage of ambient light.
  • the material of the second base layer 321 is the same as the material of the second diffractive protrusions 322 , and both can be made of glass material, optical plastic and other materials.
  • the thickness h p1 of the first base layer 311 may be greater than 0.5 mm and less than 5 mm. After testing, the thickness of the first base layer 311 can ensure the diffraction of the first refractive diffractive lens 310 when the light passes through. The effect is not affected, and at the same time, the thickness of the first fold diffractive lens 310 can achieve a thinner effect.
  • the thickness h p2 of the second-fold diffractive mirror 320 may be greater than 0.5 mm and less than 5 m. After testing, the thickness of the second-fold diffraction mirror 320 can ensure that the second-fold diffraction mirror 320 has a thickness that allows light to pass through. The diffraction effect is not affected, and at the same time, the thickness of the second fold diffractive lens 320 can achieve a thinner effect.
  • the surface of the first base layer 311 facing away from the first refractive diffractive lens 310 is the first surface 311a, and the first surface 311a may be a plane, a concave or a convex.
  • the surface shape of the first surface 311a may be a spherical surface or an aspherical surface, and the embodiment of the present application does not limit the specific surface shape of the first surface 311a.
  • the surface of the first base layer 311 facing away from the first folded diffractive mirror 310 is spherical or aspherical, the diffraction effect of the first folded diffractive mirror 310 can be more optimized.
  • the surface of the first base layer 311 used to support the first diffractive protrusions 312 is the second surface 311b, which can be considered as the reference surface of the first diffractive structure, and the second surface 311b can be a plane, a spherical surface or an aspherical surface.
  • the embodiment of the present application does not limit the specific surface shape of the second surface 311b.
  • the surface where the tops of all the first diffractive protrusions 312 are located is the third surface 311c, and the height of the first diffractive protrusions 312 can be considered as the distance between the second surface 311b and the third surface 311c.
  • the surface equation of the first diffraction structure is shown in the following formula (1).
  • the aspherical surface is the first aspherical surface.
  • x d1 is the distance between each point of the first diffractive structure and the reference plane of the first diffractive structure, the distance is the distance along the optical axis, c is the curvature of the second surface 311b, and K is the conic constant , A 2n is the aspheric coefficient of the power of 2n, r is the distance of the ambient light from the optical axis, n is the number of diffraction rings included in the first-fold diffraction mirror 310 counted from the center to the edge of the first-fold diffraction mirror 310 , that is, the number of the first diffraction protrusions 312.
  • first diffraction protrusions 312 are annular protrusions
  • an annular protrusion is a diffraction ring zone
  • h d1 is the first diffraction ring calculated by the scalar diffraction theory.
  • the height of a diffractive structure that is, the distance between the third surface 311c and the second surface 311b, can also be considered as the height of the first diffractive protrusion 312, 0.1 ⁇ m ⁇ h d1 ⁇ 50 ⁇ m, ⁇ 1 is the first diffractive structure
  • the optical path due to diffraction can be calculated by the following formula (2).
  • ⁇ 1 (C 2 r 2 +C 4 r 4 +C 6 r 6 +...+C 2n r 2n ) ⁇ 2 ⁇ / ⁇ (2)
  • C 2n is the phase coefficient of the power of 2n
  • ⁇ is the wavelength of the ambient light
  • r is the distance of the ambient light from the optical axis.
  • the surface of the second base layer 321 facing away from the second refractive diffractive lens 320 is a fourth surface 321a
  • the fourth surface 321a may be a plane, a concave or a convex.
  • the surface shape of the fourth surface 321a may be a spherical surface or an aspheric surface, and the embodiment of the present application does not limit the specific surface shape of the fourth surface 321a.
  • the refraction effect of the second folded diffractive lens 320 can be more optimized.
  • the surface of the second base layer 321 used to support the second diffractive protrusions 322 is the fifth surface 321b
  • the fifth surface 321b can be regarded as the reference surface of the second diffractive structure
  • the fifth surface 321b can be a plane, a spherical surface or a non-linear surface
  • the embodiment of the present application does not limit the specific surface shape of the fifth surface 321b.
  • the surface where the tops of all the second diffractive protrusions 322 are located is the sixth surface 321c, and the height of the second diffractive protrusions 322 can be considered as the distance between the fifth surface 321b and the sixth surface 321c.
  • the surface equation of the second diffraction structure is shown in the following formula (3).
  • the aspherical surface is the second aspherical surface.
  • x d2 is the distance between each point of the second diffractive structure and the reference plane of the second diffractive structure, the distance is the distance along the optical axis direction, c is the curvature of the fifth surface 321b, K is the conic constant, A 2n is the aspheric coefficient of the power of 2n, r is the distance of the ambient light from the optical axis, n is the number of diffraction rings counted from the center to the edge of the second-fold diffraction mirror 320 included in the second-fold diffraction mirror 320, That is, the number of the first diffraction protrusions 312, in the case that the second diffraction protrusions 322 are ring-shaped protrusions, one ring-shaped protrusion is a diffraction ring zone, h d2 , is the first diffraction ring calculated by the scalar diffraction theory.
  • the height of the second diffractive structure that is, the distance between the sixth surface 321c and the fifth surface 321b, can also be considered as the height of the second diffractive protrusion 322, 0.1 ⁇ m ⁇ h d2 ⁇ 50 ⁇ m, ⁇ 2 is the second diffractive structure
  • the optical path due to diffraction can be calculated by the following formula (4).
  • ⁇ 2 (C 2 r 2 +C 4 r 4 +C 6 r 6 +...+C 2n r 2n ) ⁇ 2 ⁇ / ⁇ (4)
  • C 2n is the phase coefficient of the power of 2n
  • ⁇ is the wavelength of the ambient light
  • r is the distance of the ambient light from the optical axis.
  • the first surface 311a or the fourth surface 321a may be a plane, a spherical surface or an aspherical surface.
  • the curvatures of the first surface 311a and the fourth surface 321a may be the same or different.
  • the surface type equation of the first surface 311a or the fourth surface 321a may be represented by the following formula (5).
  • c is the curvature of the first surface 311a or the fourth surface 321a
  • K is the conic constant
  • a 2n is the aspheric coefficient of the 2nth power
  • r is the distance of the ambient light from the optical axis
  • the axis refers to the optical axis of the first refractive diffractive lens 310 and the second refractive diffractive lens 320 .
  • x is the distance between each point of the first surface 311a or the fourth surface 321a and the respective base surface
  • the base surface is a surface passing through the center of the first surface 311a or the fourth surface 321a and perpendicular to the optical axis
  • the distance is the distance along the optical axis.
  • the first-order diffraction of the first lens mechanism 300 is the diffraction order for projection, and the diffracted light of other orders will become glare, which will adversely affect the projection imaging.
  • the projection apparatus 400 disclosed in this embodiment of the present application may further include a second lens mechanism 200 , and the second lens mechanism 200 may be disposed between the first lens mechanism 300 and the display screen 100 .
  • the second lens mechanism 200 may include a common lens, such as a convex lens, a concave lens, etc.
  • the embodiment of the present application does not limit the specific type and quantity of the lens included in the second lens mechanism 200 .
  • the second lens mechanism 200 may include a lens holder 210 and at least two lenses 220, and the at least two lenses 220 are mounted on the lens holder 210, so as to facilitate the integral installation after pre-assembly.
  • the second lens mechanism 200 can adjust the light projected to the first lens mechanism 300 , so as to more effectively adjust parameters such as the outgoing field angle of the light.
  • the projection device 400 disclosed in the embodiment of the present application may be equipped with a traditional lens on the basis of the display screen 100 and the first lens mechanism 300, and the number N of the lens satisfies 0 ⁇ N ⁇ 9. When N is equal to 0, it can be considered that the projection apparatus 400 does not include the second lens mechanism 200 .
  • the embodiment of the present invention discloses smart glasses.
  • the disclosed smart glasses include a glasses body 500 and the projection device 400 described above.
  • the glasses body 500 includes a spectacle lens 530 , and the spectacle lens 530 may be a projected component of the projection device 400 , and the projection device 400 is disposed opposite to the spectacle lens 530 .
  • the light projected by the display screen 100 can pass through the first lens mechanism 300 and then be projected onto the spectacle lens 530 , and finally a virtual image can be formed on the spectacle lens 530 .
  • the glasses main body 500 includes temples 510 and a frame 520 , the glasses 530 are arranged on the frame 520 , and the legs 510 are rotatably connected to the frame 520 .
  • the projection device 400 may be arranged on the temple 510 .
  • the projection device may be arranged on the temple 510 by bonding, welding, or the like.
  • the projection device 400 may be disposed on the temple 510 by means of a screw connection, so that maintenance personnel can easily disassemble and repair.
  • the smart glasses may include two spectacle lenses 530 , and the smart glasses may include two projection devices 400 , each of which is matched with one spectacle lens 530 .
  • the spectacle lens 530 is provided with a diffractive waveguide 540.
  • the diffractive waveguide 540 includes an incident grating 541, a turning grating 542, and an exit grating 543.
  • the incident grating 541, the turning grating 542, and the exit grating 543 are connected by optical paths in sequence, thereby realizing light sequential transmission.
  • the light exit direction of the exit grating 543 is the direction of the inner surface of the spectacle lens 530 , that is, the direction of the surface of the spectacle lens 530 facing the human eye.
  • the light emitted by the display screen 100 passes through the first lens mechanism 300 and is projected to the spectacle lens 530 , the incident grating 541 receives the light and conducts a waveguide, and the light passing through the incident grating 541 is reflected in the diffraction waveguide 540 in the form of total reflection.
  • the light in the diffractive waveguide 540 is finally transmitted in the form of collimated light from the exit grating 543 from the diffractive waveguide 540 to the human eye, and finally realizes the emission from the diffractive waveguide 540 of the shot.
  • the real light from the environment is directly projected to the human eye through the diffractive waveguide 540, and the virtual light and the real light projected from the output grating 543 of the display screen 100 finally enter the human eye at the same time, and are imaged on the retina through the human eye lens, so that the user can simultaneously See virtual images and surroundings for augmented reality effects.

Abstract

La présente invention concerne un dispositif de projection (400), comprenant un écran d'affichage (100) et un premier mécanisme de lentille (300). Le premier mécanisme de lentille (300) comprend une première lentille de réfraction de diffraction (310) et une seconde lentille de réfraction de diffraction (320). Dans la direction perpendiculaire à l'écran d'affichage (100) et opposée à l'écran d'affichage (100), l'écran d'affichage (100), la première lentille de réfraction de diffraction (310) et la seconde lentille de réfraction de diffraction (320) sont agencées en séquence. La lumière émise par l'écran d'affichage (100) est émise au moyen de la première lentille de réfraction de diffraction (310) et de la seconde lentille de réfraction de diffraction (320) en séquence. L'invention concerne également des lunettes intelligentes, comprenant un corps de lunettes (500) et un dispositif de projection (400). Le corps de lunettes (500) comprend des verres de lunettes (530). Les verres de lunettes (530) sont opposés au dispositif de projection (400), et la lumière projetée par l'écran d'affichage (100) peut être projetée sur les verres de lunettes (530) après avoir traversé le premier mécanisme de lentille (300).
PCT/CN2021/120878 2020-09-30 2021-09-27 Dispositif de projection et lunettes intelligentes WO2022068763A1 (fr)

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