CN209167776U - A kind of projection lens and nearly eye display device - Google Patents
A kind of projection lens and nearly eye display device Download PDFInfo
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- CN209167776U CN209167776U CN201821850222.2U CN201821850222U CN209167776U CN 209167776 U CN209167776 U CN 209167776U CN 201821850222 U CN201821850222 U CN 201821850222U CN 209167776 U CN209167776 U CN 209167776U
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Abstract
The utility model embodiment is related to optical projection technical field, discloses a kind of projection lens and nearly eye display device.Wherein, which includes: guidance display element group, for will be converted to projected light beam from the illuminating bundle of first direction incidence, and is emitted the projected light beam towards second direction；Lens element group, central optical axis are overlapped with the second direction, for receiving and transmiting the projected light beam of the guidance display element group output；Optical element is turned to, for being reflected at least twice to the projected light beam, so that the projected light beam turns to and gathers, and is emitted it towards third direction.In the above manner, the present embodiment can not change the characteristic of light beam directional light, while reduce the length of camera lens, so that small volume.
Description
Technical field
The utility model embodiment is related to optical projection technical field, shows more particularly to a kind of projection lens and nearly eye
Device.
Background technique
In recent years, the nearly eye display technology such as augmented reality is rapidly developed, for example, the Ho l oLens of Microsoft
(a kind of holographic computer equipment not limited by cable), the holographic fluoroscopy techniques glasses of Sony etc..The nearly eye of augmented reality is aobvious
The technology of showing be it is a kind of by optical field imaging in the technology of realistic space, can be realized interacting for virtual world and real world.
Currently, realizing that the scheme of augmented reality is widely used by optical waveguide, the program can be set in reduction
While standby volume, mitigation quality, and realize the orientation conduction of light.
The inventor of the utility model has found during realizing the utility model embodiment: current projection lens is adopted
Dress steering is carried out to light beam with plane mirror or curved reflector, as shown in Figure 1a, can be obtained after curved reflector
Non-parallel light easily causes aberration, as shown in Figure 1 b, although plane mirror can obtain directional light and entire space can be made to increase
Greatly, so that device volume increases.
Utility model content
The utility model embodiment is mainly solving the technical problems that provide a kind of projection lens and nearly eye display device, energy
Enough characteristics for not changing light beam directional light, while the length of camera lens is reduced, so that small volume.
In order to solve the above technical problems, the technical solution that the utility model embodiment uses is: providing a kind of projection
Camera lens, comprising: guidance display element group for will be converted to projected light beam from the illuminating bundle of first direction incidence, and makes institute
Projected light beam is stated to be emitted towards second direction；Lens element group, central optical axis are overlapped with the second direction, are used to receive and saturating
Penetrate the projected light beam of the guidance display element group output；Optical element is turned to, for carrying out at least two to the projected light beam
Secondary refraction so that the projected light beam turns to and gathers, and is emitted it towards third direction.
Optionally, the steering optical element includes: lens body, first refractive face and the second plane of refraction, and described first
Plane of refraction and second plane of refraction are respectively arranged on the both ends of the lens body；When the projected-beam entrance to described first
The projected light beam is refracted to the lens body by plane of refraction, the first refractive face, and the lens body transmits the throwing
For shadow light beam to second plane of refraction, second plane of refraction reflects the projected light beam, so that the projected light beam is towards described
Third direction outgoing.
Optionally, the lens body is made of the wedge of two or more different refractivities, and then is effectively eliminated
The color difference of the projected light beam.
Optionally, the steering optical element is specifically used for: to projected light beam progress refraction at least twice and at least
Primary event so that the projected light beam turns to and gathers, and is emitted it towards third direction.
Optionally, the steering optical element includes: lens body, first refractive face, the second plane of refraction and the first reflection
Face, the first refractive face and second plane of refraction are respectively arranged on the both ends of the lens body, and first reflecting surface is set
Intersect in the side of the lens body, and respectively with the first refractive face, second plane of refraction；When the projected light beam
It is incident to the first refractive face, the projected light beam is refracted to the lens body, the lens by the first refractive face
Ontology transmits the projected light beam to first reflecting surface, projected light beam described in first reflective surface, the lens
For the projected light beam after ontology Transflective to second plane of refraction, second plane of refraction reflects the projected light beam,
So that the projected light beam is emitted towards the third direction.
Optionally, the steering optical element includes: lens body, first refractive face, the second plane of refraction, the first reflecting surface
With the second reflecting surface, the first refractive face and second plane of refraction are respectively arranged on the both ends of the lens body, and described
One reflecting surface is set to the side of the lens body, and second reflecting surface is set to the other side of the lens body, and described the
One reflecting surface, second reflecting surface intersect with the first refractive face, second plane of refraction；When the projected light beam enters
It is incident upon the first refractive face, the projected light beam is refracted to the lens body, the lens sheet by the first refractive face
Body transmits the projected light beam to first reflecting surface, projected light beam described in first reflective surface, the lens sheet
Body transmits the projected light beam after first reflection to second reflecting surface, projected light described in second reflective surface
Beam, the lens body transmit the projected light beam after the second secondary reflection to second plane of refraction, second plane of refraction
The projected light beam is reflected, so that the projected light beam is emitted towards the third direction.
Optionally, the guidance display element group includes the first display chip and prism；The prism for receive and it is saturating
The illuminating bundle is crossed, so that it is exported to first display chip；First display chip is used for the prism is defeated
The illuminating bundle out is converted to the projected light beam, and makes its output to the prism；The prism is also used to reflect institute
The projected light beam for stating the output of the first display chip, so that the projected light beam is emitted towards the second direction.
Optionally, the guidance display element group includes: the second display chip and the second polarization beam splitter；Described second
Polarization beam splitter is for receiving illuminating bundle described in simultaneously permeation parts, so that it is exported to second display chip；It is described
Second display chip is used to the part illuminating bundle that second polarization beam splitter exports being converted to the projected light
Beam, and make its output to second polarization beam splitter；It is aobvious that second polarization beam splitter is also used to reflect described second
The projected light beam for showing chip output, so that the projected light beam is emitted towards the second direction.
Optionally, the lens element group includes: the first lens, the second lens and the third lens；First lens, institute
State the second lens and the third lens along the lens element group central optical axis according to from the guidance display element group to
The direction sequential of the reflective optical devices group；First lens, second lens, the third lens and described
The focal length of projection lens meets: 0.8 < | F1/ F | < 1.3,0.5 < | F2/ F | < 1.0；Wherein, F1For the coke of first lens
Away from F2For the focal length after second lens and the third lens combination, F is the focal length of the projection lens.
Optionally, the projection lens further include: convergent lens；The convergent lens is set to the steering optical element
Light emission side, the convergent lens are used to receive the projected light beam of the steering optical element output, and assemble the projection
Light beam and elimination color difference, so that the projected light beam after assembling is emitted towards the third direction.
Optionally, the projection lens further include: diaphragm, the diaphragm is set to the light emission side of the convergent lens, described
The central optical axis of diaphragm is overlapped with the central optical axis of the convergent lens.
In order to solve the above technical problems, another technical solution that the utility model embodiment uses is: providing a kind of close
Eye display device, including lighting module, diffraction waveguide and above-mentioned projection lens, the lighting module is set to the projection lens
The incident side of head, the diffraction waveguide are set to the light emission side of the projection lens.
The beneficial effect of the utility model embodiment is: being in contrast to the prior art, the utility model embodiment mentions
Incident illuminating bundle is converted to by projected light beam by guidance display element group for a kind of projection lens, lens element group is to saturating
Mirror light beam is handled and is transmitted, and to guarantee the image quality of projection lens, is turned to optical element and is reflected to projected light beam,
To be turned to and be gathered, so as to not change the characteristic of light beam directional light, while reducing the length of camera lens so that volume compared with
It is small.
Detailed description of the invention
One or more is implemented to illustrate by corresponding attached drawing, these exemplary illustrations are not constituted
Restriction to embodiment, the element in attached drawing with same reference numbers label is expressed as similar element, unless there are special Shen
Bright, composition does not limit the figure in attached drawing.
Fig. 1 a is the schematic diagram that curved reflector turns to light beam in the prior art；
Fig. 1 b is the schematic diagram that plane mirror turns to light beam in the prior art；
Fig. 2 is a kind of structural schematic diagram of the utility model projection lens that wherein an embodiment provides；
Fig. 3 a is the structural schematic diagram of the steering optical element of the projection lens of Fig. 2；
Fig. 3 b is another structural schematic diagram of the steering optical element of the projection lens of Fig. 2；
Fig. 3 c is the another structural schematic diagram of the steering optical element of the projection lens of Fig. 2；
Fig. 4 a is the another another structural schematic diagram of the steering optical element of the projection lens of Fig. 2；
The structural schematic diagram for the steering optical element that Fig. 4 b is Fig. 3 a；
Fig. 5 a is a kind of structural schematic diagram for projection lens that another embodiment of the utility model provides；
Fig. 5 b is another structural schematic diagram of the processing module of Fig. 5 a projection lens；
Fig. 6 is a kind of structural schematic diagram of nearly eye display device provided by the embodiment of the utility model.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed
Thin explanation.It should be noted that it can be directly in another element when element is expressed " being fixed on " another element
Upper or placed in the middle there may be one or more therebetween elements.When an element is expressed " connection " another element, it can
To be directly to another element or elements placed in the middle there may be one or more therebetween.This specification is used
Term "vertical", "horizontal", "left" and "right", "upper", "lower", "inner", "outside", the instructions such as " bottom " orientation or position
Setting relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and
It is not that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore
It should not be understood as limiting the present invention.In addition, term " first ", " second " etc. are used for description purposes only, and cannot manage
Solution is indication or suggestion relative importance.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Term used in the description of the utility model is intended merely to
The purpose for describing specific embodiment is not intended to limitation the utility model.Term "and/or" used in this specification includes
Any and all combinations of one or more related listed items.
In addition, as long as technical characteristic involved in the utility model difference embodiment disclosed below is each other not
Constituting conflict can be combined with each other.
Projection lens in the utility model embodiment turns to optical element by setting, it is parallel can not to change light beam
The characteristic of light, while the length of camera lens is reduced, so that small volume.
Projection lens in the utility model embodiment can be applied to the nearly eye display device in the present embodiment, to subtract
The volume of small device.
Specifically, projection lens and nearly eye display device will be illustrated by embodiment below.
Embodiment one
Referring to Fig. 2, being a kind of structural schematic diagram of the utility model projection lens that wherein an embodiment provides.Such as figure
Shown in 2, projection lens 100 includes guidance display element group 110, lens element group 120 and turns to optical element 130.
Wherein, lens element group 120 is set to guidance display element group 110 and turns between optical element 130, guidance display
Element group 110 makes the projected light beam towards second party for will be converted to projected light beam from the illuminating bundle of first direction incidence
To outgoing, lens element group 120 is used to receive and transmit the projected light beam that guidance display element group 110 exports, and turns to optics member
Part 130 so that projected light beam turns to and gathers, and goes out it towards third direction for being reflected at least twice to projected light beam
It penetrates.Wherein, first direction and the angle of second direction are greater than 0 ° less than or equal to 90 °, and the angle of second direction and third direction is big
It is less than or equal to 90 ° in 0 °.In the above manner, being turned to and being gathered to projected light beam, light beam directional light can not be changed
Characteristic, while the length of camera lens is reduced, so that small volume.
The module for guiding display element group 110 that can form for display chip and optical element, display chip can will shine
Mingguang City's beam is converted to projected light beam, and optical element can change the direction of propagation of light beam.
Specifically, referring again to Fig. 2, guiding display element group 110 includes: the first display chip 111 and prism 112.The
One display chip 111 can be DMD display chip, Digital Modulation can be carried out to light, so that illuminating bundle is converted to throwing
Shadow light beam.First display chip 111 is used to the illuminating bundle that prism 112 exports being converted to projected light beam, and makes its output extremely
Prism 112.Prism 112 can be right angle prism, can light be transmitted and be reflected.Prism 112 is for receiving and penetrating
Illuminating bundle, so that it is exported to the first display chip 111；Prism 112 is also used to reflect the throwing of the first display chip 111 output
Shadow light beam, so that the projected light beam is emitted towards second direction.
In the present embodiment, set on prism 112, wherein (right-angle surface is right-angle side shape to a right-angle surface to the first display chip 111
At side) side, lens element group 120 is set to the side of another right-angle surface of prism 112, and illuminating bundle is from first direction court
The inclined-plane of prism 112 is incident, and prism 112 penetrates the illuminating bundle, so that illuminating bundle is exported to the first display chip 111, the
The illuminating bundle that prism 112 exports is converted to projected light beam and exported to the inclined-plane of prism 112, prism by one display chip 111
112 will reflect the projected light beam, so that the projected light beam is emitted towards second direction.
Wherein, the inclined-plane of prism 112 is equipped with transmission film close to the first display chip 111, with transillumination light beam.Prism
112 inclined-plane is equipped with reflectance coating close to the first display chip 111, with reflected projection beam.
Wherein, when illuminating bundle is incident to the inclined-plane of prism 112 along first direction, incidence angle is acute angle.Prism 112 it is oblique
When being reflected in face of projected light beam, reflection angle is 90 °.In the above manner, making the first direction of illuminating bundle incidence
Angle with the second direction of projected light beam outgoing is greater than 0 ° less than 90 °.Also, first direction and the first display chip 111
The normal angle φ of working face is twice of small mirror deflection angle in the first display chip 111, the range of included angle be 24 ° extremely
34°。
Lens element group 120 may include several optical lenses, for being dissipated projected light beam and/or being assembled,
So as to shorten the optics total length of projection lens 100, and guarantee the image quality of projection lens 100.In lens element group 120
Heart optical axis is overlapped with second direction, and lens element group 120 is used to receive and transmit the projected light that guidance display element group 110 exports
Beam.
Specifically, lens element group 120 includes the first lens 121, the second lens 122 and the third lens 123.First lens
121, the second lens 122 and the third lens 123 can be prepared by glass or plastic material, the first lens 121, the second lens
122 and the third lens 123 incidence surface can be spherical surface or aspherical, the first lens 121, the second lens 122 and the third lens
123 light-emitting surface may be spherical surface or aspherical.First lens 121, the second lens 122 and the third lens 123 are along lens cells
The central optical axis of part group 120 is according to the direction sequential from guidance display element group 110 to reflective optical devices group 130, and the
The central optical axis of one lens 121, the second lens 122 and the third lens 123 is overlapped, so that guidance display element group 110 is emitted
Projected light beam in a second direction successively pass through the first lens 121, the second lens 122 and the third lens 123.
Wherein, the focal length of the first lens 121, the second lens 122 and the third lens 123 and projection lens 100 meets: 0.8
< | F1/ F | < 1.3,0.5 < | F2/ F | < 1.0；Wherein, F1For the focal length of the first lens 121, F2For the second lens 122 and
Focal length after the combination of three lens 133, F are the focal length of projection lens 100.For example, F1、F2, F meet 0.81 < | F1/ F | < 1.2,
0.6 < | F2/ F | < 0.9；In another example F1、F2, F meet 0.82 < | F1/ F | < 1.1,0.51 < | F2/ F | < 0.9.By above
Mode can be conducive to the optics total length for shortening projection lens 100, realize the miniaturization of mould group, while guarantee projection lens
100 image quality.
Optionally, the light-emitting surface of the second lens 122 can be bonded setting with the incidence surface of the third lens 123 with gapless, the
The light-emitting surface of three lens 123 and the incidence surface for turning to optical element 130 can be bonded with gapless to be arranged.
It turns to optical element 130 and is set to side of the lens element group 120 far from guidance display element group 110, turn to optics
The projected light beam that element 130 exports lens element group 120 is reflected at least twice, so that projected light beam turns to and gathers,
And it is emitted it towards third direction.Wherein, the first of the third direction for referring to projected light beam output and illuminating bundle incidence is turned to
Direction is different；Gather and refer to that the first direction of third direction towards the illuminating bundle incidence of projected light beam output deflects, so that incident
Light beam is mutually drawn close with outgoing beam, and can obtain required gather effect by changing refractive index.Wherein, third direction with
The angle of first direction is greater than 90 ° and is less than or equal to 180 °.
Wherein, it reflects at least twice, may include: transmission and refraction twice, primary event and refraction, two secondary reflections twice
Refraction twice, multiple reflections and repeatedly refraction etc..
Wherein, after steering optical element 130 successively reflects projected light beam, transmits, reflects, go out along third direction
When penetrating, also referring to Fig. 3 a, turning to optical element 130 includes: lens body 131, first refractive face 132 and the second plane of refraction
133.Lens body 131 is tetragonous lens, and first refractive face 132 and the second plane of refraction 133 are respectively arranged on the phase of lens body 131
To both ends.When projected-beam entrance to first refractive face 132, in first refractive face 132 refractive deflection occurs for projected light beam, and first
Projected light beam is refracted to lens body 131 by plane of refraction 132, and projected light beam is transmitted along lens body 131, so that lens body
131 transmission projection light beams to the second plane of refraction 133, the second plane of refraction 133 reflect the projected light beam, so that projected light beam is towards third
Direction outgoing.Certainly, in some other embodiments, lens body 131 can also be by two or more different refractivities
Wedge composition, and then effectively eliminate the color difference of projected light beam.
Optionally, in some other examples, turn to optical element 130 can be specifically used for: to projected light beam carry out to
It is few to reflect and reflect at least once twice, so that projected light beam turns to and gathers, and it is emitted it towards third direction.When steering light
After element 130 successively reflects projected light beam, transmits, reflects, transmiting, reflecting, when along third direction outgoing, please together
Refering to Fig. 3 b, turning to optical element 130 includes: that lens body 131, first refractive face 132, the second plane of refraction 133 and first are anti-
Penetrate face 134.Lens body 131 is tetragonous lens, and first refractive face 132 and the second plane of refraction 133 are respectively arranged on lens body 131
Opposite end, the first reflecting surface 134 be set to lens body 131 side, and respectively with first refractive face 132, second reflect
Intersect in face 133.When projected-beam entrance to first refractive face 132, in first refractive face 132 refractive deflection occurs for projected light beam,
Projected light beam is refracted to lens body 131, lens body 131 transmission projection light beam to the first reflecting surface by first refractive face 132
134,134 reflected projection beam of the first reflecting surface, the projected light beam after reflection is transmitted along lens body 131, so that lens body
131 transmission projection light beams to the second plane of refraction 133, the second plane of refraction 133 reflect the projected light beam, so that projected light beam is towards third
Direction outgoing.
Optionally, it projected light beam is successively reflected, transmitted, reflected, transmitted, reflected, thoroughly when turning to optical element 130
After penetrating, reflecting, when along third direction outgoing, also referring to Fig. 3 c, turning to optical element 130 includes: lens body 131, the
One plane of refraction 132, the second plane of refraction 133, the first reflecting surface 134 and the second reflecting surface 135.Lens body 131 is tetragonous lens,
First refractive face 132 and the second plane of refraction 133 are respectively arranged on the opposite end of lens body 131, the first reflecting surface 134, second
Reflecting surface 135 is respectively arranged on the another opposite sides of lens body 131, and the first reflecting surface 134, the second reflecting surface 135 are with first
Plane of refraction 132, the intersection of the second plane of refraction 133.When projected-beam entrance is to first refractive face 132, projected light beam is in first refractive
Refractive deflection occurs for face 132, and projected light beam is refracted to lens body 131 by first refractive face 132, and the transmission of lens body 131 is thrown
Shadow light beam is to the first reflecting surface 134,134 reflected projection beam of the first reflecting surface, and the projected light beam after first reflection is along lens
Ontology 131 is transmitted through the second reflecting surface 135,135 reflected projection beam of the second reflecting surface, the projected light beam edge after the second secondary reflection
Lens body 131 is transmitted through the second plane of refraction 133, and the second plane of refraction 133 reflects the projected light beam, so that projected light beam is towards third
Direction outgoing.
Optionally, in some other examples, the not necessarily tetragonous lens of the shape of lens body 131 can also be it
His more rib lens, as long as projected light beam is enabled to turn to and gather.A and 4b referring to Figure 4 together, lens body 131
Shape be irregular multifaceted prism, wherein irregular multifaceted prism can be a prism, can also be with two or more ribs
Mirror is integrally formed or gluing forms.It is higher using irregular multifaceted prism design freedom, can angularly it be arranged by reflecting surface,
The angle for deflecting light beam is bigger, it is easier to realize the adjusting of low-angle.
It should be noted that no matter projected light beam is turning to progress primary event and refraction, two twice in optical element 130
Secondary reflection and twice refraction or multiple reflections etc. are not the content that the utility model limits, can be incident by changing
Angle, refractive index of lens body etc. are adjusted.
Wherein, referring again to Fig. 2, which can also include: convergent lens 140 and diaphragm 150.It assembles saturating
Mirror 140 can have the lens of converging action with convex lens etc., and focal length is positive.Convergent lens 140, which is set to, turns to optical element 130
Light emission side, convergent lens 140 be used for receives turn to optical element 130 output projected light beam, and assemble the projected light beam and
Color difference is eliminated, so that the projected light beam after assembling is emitted towards third direction.Diaphragm 150 be field stop, can limit visual field (at
As range) size.Diaphragm 150 is set to the light emission side of convergent lens 140, and the central optical axis of diaphragm 150 and convergent lens 140
Central optical axis is overlapped, and diaphragm 150 is used to adjust the visual field size of the projected light beam imaging of the output of convergent lens 140.Certainly, one
In a little other embodiments, when not needing convergent beam, convergent lens 140 be can be omitted；When not needing to adjust visual field size,
Diaphragm 150 can be omitted.
In the present embodiment, the course of work of projection lens 100 is substantially are as follows: passes through from the illuminating bundle of first direction incidence
Prism 112 is transmitted through the first display chip 111, and illuminating bundle is converted to projected light beam and exported extremely by the first display chip 111
On the slant reflection face of prism 112,112 reflected projection beam of prism, so that the projected light beam enters lens cells towards second direction
Part group 120, the transmission of lens element group 120 treated projected light beam, it is defeated to turn to 130 receiving lens element group 120 of optical element
Projected light beam out reflects projected light beam at least twice, so that projected light beam turns to and gathers, 140 meeting of convergent lens
The poly- projected light beam for turning to optical element 130 and exporting, the projected light beam of convergence are emitted after diaphragm 150 along third direction.
In the present embodiment, incident illuminating bundle is converted to throwing by guidance display element group 110 by projection lens 100
Shadow light beam, lens element group 120 are handled and are transmitted to lens light beam, to guarantee the image quality of projection lens 100, are turned to
Optical element 130 reflects projected light beam, to be turned to and be gathered, so as to not change the spy of light beam directional light
Property, while the length of camera lens is reduced, so that small volume.
Embodiment two
Fig. 5 a is please referred to, for a kind of structural schematic diagram for projection arrangement that another embodiment of the utility model provides.Such as figure
Shown in 5a, the difference with embodiment one is, guidance display element group 110 includes: the second display chip 113 and the second polarization point
Optical element 114.
Wherein, the second display chip 113 is LCOS display chip, and the second display chip 113 is used for the second polarization spectro
The partial illumination light beam that element 114 exports is converted to the first polarised light of projected light beam, and makes its output to the second polarization spectro
Element 114.
Wherein, the second polarization beam splitter 114 is polarization splitting prism, and the polarization splitting prism is by a pair of of high-precision right angle
Prism cementing forms, wherein polarization beam splitter is coated on the inclined-plane of a prism, so that the polarization splitting prism can be incidence
Unpolarized light shafts are divided into the vertical linearly polarized light of two beams, wherein a polarised light passes through completely, another polarised light is reflected.The
Two polarization beam splitters 114 are for receiving simultaneously permeation parts illuminating bundle, so that it is exported to the second display chip 113；Second
Polarization beam splitter 114 is also used to reflect the projected light beam of the second display chip 113 output, so that projected light beam is towards second direction
Outgoing.
Wherein, illuminating bundle is incident to polarization splitting prism along first direction, with the light splitting surface of the polarization splitting prism
Angle is 45 °, so that the first direction of illuminating bundle incidence and the angle of the second direction of projected light beam outgoing are equal to 90 °,
So that the direction for the projected light beam that projection lens 100 exports is parallel with the incident direction of illuminating bundle and on the contrary (i.e. the
One direction is parallel with third direction and opposite).
Optionally, as shown in Figure 5 b, the second polarization beam splitter 114 can also be polarizing film, the polarizing film and second party
It is arranged to angle at 45 °, which can be divided into the vertical linearly polarized light of two beams for incident unpolarized light shafts, wherein one
Polarised light passes through completely, and another polarised light is shielded.
In the present embodiment, the course of work of projection lens 100 is substantially are as follows: passes through from the illuminating bundle of first direction incidence
After second polarization beam splitter 114, the partial poolarized light of illuminating bundle is transmitted through the second display chip 112, illuminating bundle it is another
A part of polarised light is reflected, and partial illumination light beam is converted to projected light beam by the second display chip 112, and is exported to second partially
It shakes on the polarization light-dividing surface of beam splitter 114, the second polarization beam splitter 114 reflects the projected light beam, so that the projected light beam
Enter lens element group 120 towards second direction, the transmission of lens element group 120 treated projected light beam turns to optical element 130
Receiving lens element group 120 export projected light beam, projected light beam is reflected at least twice so that projected light beam turn to
Gather, convergent lens 140, which is assembled, turns to the projected light beam that optical element 130 exports, and the projected light beam of convergence is after diaphragm 150
It is emitted along third direction.
In the present embodiment, incident illuminating bundle is converted to throwing by guidance display element group 110 by projection lens 100
Shadow light beam, lens element group 120 are handled and are transmitted to lens light beam, to guarantee the image quality of projection lens 100, are turned to
Optical element 130 reflects projected light beam, to be turned to and be gathered, so as to not change the spy of light beam directional light
Property, while the length of camera lens is reduced, so that small volume.
Embodiment three
Referring to Fig. 6, being a kind of structural schematic diagram of nearly eye display device provided by the embodiment of the utility model.Such as Fig. 6
Shown, which includes in lighting module 210, diffraction waveguide 220 and above-described embodiment one or embodiment two
Projection lens 100.
Wherein, in the present embodiment, it is illustrated for implementing one.
Lighting module 210 can be laser light source, such as optical fiber-coupled laser light source, diode laser light source or solid swash
Radiant etc..Lighting module 210 may include red laser light source, green laser light source, blue laser light source, by using
Tricolor laser, lighting module 210 projection arrangement 100 can be made most truly to reproduce objective world is abundant, gorgeous color, mention
For the expressive force of more shock.
Wherein, lighting module 210 is set to the incident side of projection lens 100, and lighting module 210 is used to be projection lens 100
There is provided illuminating bundle, the relative position of lighting module 210 and projection arrangement 100 can be by the incident direction (i.e. the of illuminating bundle
One direction) it determines, for example, then lighting module 210 is set to prism if it is desired to which first direction and second direction angle are acute angle
112 inclined-plane side.
Diffraction waveguide 220 is set to the light emission side of projection lens 100, for receiving the projected light beam of the output of projection lens 100,
Projected light beam is limited in diffraction waveguide 220 and is propagated, to be imaged, so that human eye can be received by diffraction waveguide 220
Image-forming information.
In the present embodiment, nearly eye display device 200 passes through the projection lens 100 of setting small volume, so that entire close
The equipment volume of eye display device 200 is smaller, while not changing the characteristic of light beam directional light, does not influence image quality, favorably
In the miniaturization of device.
It should be noted that giving the preferable implementation of the utility model in the specification and its attached drawing of the utility model
Mode, still, the utility model can be realized by many different forms, however it is not limited to which this specification is described to be implemented
Mode, these embodiments are not as the additional limitation to the content of the present invention, the purpose of providing these embodiments is that making
It is more thorough and comprehensive to the understanding of the disclosure of the utility model.Also, above-mentioned each technical characteristic continues to be combined with each other, and is formed
The various embodiments not being enumerated above are accordingly to be regarded as the range of the utility model specification record；Further, to this field
For those of ordinary skill, it can be modified or changed according to the above description, and all these modifications and variations all should belong to
The protection scope of the appended claims for the utility model.
Claims (12)
1. a kind of projection lens characterized by comprising
Display element group is guided, for projected light beam will to be converted to from the illuminating bundle of first direction incidence, and makes the projection
Light beam is emitted towards second direction；
Lens element group, central optical axis are overlapped with the second direction, for receiving and transmiting the guidance display element group
The projected light beam of output；
Optical element is turned to, for being reflected at least twice to the projected light beam, so that the projected light beam turns to and gathers
Hold together, and is emitted it towards third direction.
2. projection lens according to claim 1, which is characterized in that the steering optical element includes: lens body,
One plane of refraction and the second plane of refraction, the first refractive face and second plane of refraction are respectively arranged on the two of the lens body
End；
When the projected-beam entrance to the first refractive face, the first refractive face refracts to the projected light beam described
Lens body, the lens body transmit the projected light beam to second plane of refraction, described in the second plane of refraction refraction
Projected light beam, so that the projected light beam is emitted towards the third direction.
3. projection lens according to claim 2, which is characterized in that the lens body is rolled over by two or more differences
The wedge composition of rate is penetrated, and then effectively eliminates the color difference of the projected light beam.
4. projection lens according to claim 1, which is characterized in that the steering optical element is specifically used for: to described
Projected light beam carries out refraction at least twice and reflects at least once, so that the projected light beam turns to and gathers, and makes it towards the
The outgoing of three directions.
5. projection lens according to claim 4, which is characterized in that the steering optical element includes: lens body,
One plane of refraction, the second plane of refraction and the first reflecting surface, the first refractive face and second plane of refraction are respectively arranged on described
The both ends of mirror ontology, first reflecting surface are set to the side of the lens body, and respectively with the first refractive face, described
The intersection of second plane of refraction；
When the projected-beam entrance to the first refractive face, the first refractive face refracts to the projected light beam described
Lens body, the lens body transmit the projected light beam to first reflecting surface, described in first reflective surface
Projected light beam, the projected light beam after the lens body Transflective to second plane of refraction, second plane of refraction
The projected light beam is reflected, so that the projected light beam is emitted towards the third direction.
6. projection lens according to claim 4, which is characterized in that the steering optical element includes: lens body,
One plane of refraction, the second plane of refraction, the first reflecting surface and the second reflecting surface, the first refractive face and second plane of refraction difference
Set on the both ends of the lens body, first reflecting surface is set to the side of the lens body, and second reflecting surface is set
In the other side of the lens body, first reflecting surface, second reflecting surface with the first refractive face, described
The intersection of two planes of refraction；
When the projected-beam entrance to the first refractive face, the first refractive face refracts to the projected light beam described
Lens body, the lens body transmit the projected light beam to first reflecting surface, described in first reflective surface
Projected light beam, the projected light beam after lens body transmission first reflection to second reflecting surface, described second
Projected light beam described in reflective surface, the lens body transmit the projected light beam after the second secondary reflection to second folding
Face is penetrated, second plane of refraction reflects the projected light beam, so that the projected light beam is emitted towards the third direction.
7. projection lens according to claim 1, which is characterized in that the guidance display element group includes the first display core
Piece and prism；
The prism is for receiving and through the illuminating bundle, so that it is exported to first display chip；
The illuminating bundle that first display chip is used to export on the prism is converted to the projected light beam, and makes it
It exports to the prism；
The prism is also used to reflect the projected light beam of first display chip output, so that the projected light beam is towards institute
State second direction outgoing.
8. projection lens according to claim 1, which is characterized in that the guidance display element group includes: the second display
Chip and the second polarization beam splitter；
Second polarization beam splitter is shown for receiving illuminating bundle described in simultaneously permeation parts so that it is exported to described second
Show chip；
Second display chip is used to the part illuminating bundle that second polarization beam splitter exports being converted to institute
Projected light beam is stated, and makes its output to second polarization beam splitter；
Second polarization beam splitter is also used to reflect the projected light beam of the second display chip output, so that described
Projected light beam is emitted towards the second direction.
9. projection lens according to claim 1, which is characterized in that the lens element group includes: the first lens, second
Lens and the third lens；
First lens, second lens and the third lens along the lens element group central optical axis according to from institute
Guidance display element group is stated to the direction sequential for turning to optical element；
First lens, second lens, the third lens and the projection lens focal length meet:
0.8<|F1/F|<1.3,
0.5<|F2/F|<1.0；
Wherein, F1For the focal length of first lens, F2For the focal length after second lens and the third lens combination, F is
The focal length of the projection lens.
10. -9 described in any item projection lens according to claim 1, which is characterized in that the projection lens further include: assemble
Lens；
The convergent lens is set to the light emission side for turning to optical element, and the convergent lens is for receiving the steering optics
The projected light beam of element output, and assemble the projected light beam and eliminate color difference, so that the projected light after assembling
Beam is emitted towards the third direction.
11. projection lens according to claim 10, which is characterized in that the projection lens further include: diaphragm, the light
Door screen is set to the light emission side of the convergent lens, and the central optical axis of the diaphragm is overlapped with the central optical axis of the convergent lens.
12. a kind of nearly eye display device, which is characterized in that any including lighting module, diffraction waveguide and claim 1-11
Projection lens described in, the lighting module are set to the incident side of the projection lens, and the diffraction waveguide is set to the throwing
The light emission side of shadow camera lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821850222.2U CN209167776U (en) | 2018-11-09 | 2018-11-09 | A kind of projection lens and nearly eye display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821850222.2U CN209167776U (en) | 2018-11-09 | 2018-11-09 | A kind of projection lens and nearly eye display device |
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| Publication Number | Publication Date |
|---|---|
| CN209167776U true CN209167776U (en) | 2019-07-26 |
Family
ID=67337536
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821850222.2U Active CN209167776U (en) | 2018-11-09 | 2018-11-09 | A kind of projection lens and nearly eye display device |
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| Country | Link |
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| CN (1) | CN209167776U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255789A (en) * | 2020-10-21 | 2021-01-22 | 京东方科技集团股份有限公司 | Virtual reality display optical system and virtual reality equipment |
| CN114077143A (en) * | 2021-10-29 | 2022-02-22 | 歌尔光学科技有限公司 | Projection device, control method of projection device and projection system |
-
2018
- 2018-11-09 CN CN201821850222.2U patent/CN209167776U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255789A (en) * | 2020-10-21 | 2021-01-22 | 京东方科技集团股份有限公司 | Virtual reality display optical system and virtual reality equipment |
| CN112255789B (en) * | 2020-10-21 | 2022-04-22 | 京东方科技集团股份有限公司 | Virtual reality display optical system and virtual reality equipment |
| CN114077143A (en) * | 2021-10-29 | 2022-02-22 | 歌尔光学科技有限公司 | Projection device, control method of projection device and projection system |
| CN114077143B (en) * | 2021-10-29 | 2024-04-30 | 歌尔光学科技有限公司 | Projection device, control method of projection device and projection system |
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