CN110161657A - Projection lens and projection display apparatus - Google Patents
Projection lens and projection display apparatus Download PDFInfo
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- CN110161657A CN110161657A CN201910499899.9A CN201910499899A CN110161657A CN 110161657 A CN110161657 A CN 110161657A CN 201910499899 A CN201910499899 A CN 201910499899A CN 110161657 A CN110161657 A CN 110161657A
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- positive lens
- inflexion
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a kind of projection lens and projection display apparatus, the projection lens is used to receive the projection ray of display unit transmitting, projection lens directive diaphragm passes through in projection ray, the projection lens includes: to be disposed with the first positive lens for projection imaging, the first negative lens, the second positive lens and third positive lens along the diaphragm to the display unit direction；The field angle for defining the projection lens is FOV, the field angle half of the projection lens is HFOV, the display imaging surface of the light-emitting surface of first positive lens of the projection lens to the display unit is the overall length of the projection lens, the overall length of the projection lens is TTL, then tan (HFOV)/TTL > 0.015, the telecentricity of the projection lens is Tele, then 0.5 ° of Tele <.The present invention provides a kind of projection lens, convenient for minimizing projection device.
Description
Technical field
The present invention relates to projection products technical field more particularly to a kind of projection lens and projection display apparatus.
Background technique
With the progress of image science and technology, the demand of projection device is more and more, and current projection device volume is larger, inconvenient
It in carrying and uses, especially the relative complex projection lens of light path design, being typically designed use has multiple groups eyeglass, but so
It produces projection device and is difficult to the problem of minimizing.
Summary of the invention
Based on this, aiming at the problem that traditionally projection device is difficult to minimize, it is necessary to which a kind of projection lens and throwing are provided
Shadow shows equipment, can effectively solve the problem that projection device is difficult to the problem of minimizing.
To achieve the above object, projection lens proposed by the present invention, the projection lens is for receiving display unit transmitting
Projection ray, the projection ray passes through the projection lens directive diaphragm, and the projection lens includes:
Along the diaphragm to the display unit direction, it is disposed with the first positive lens for projection imaging, first
Negative lens, the second positive lens and third positive lens；
The field angle for defining the projection lens is FOV, and the field angle half of the projection lens is HFOV, the projection
The display imaging surface of the light-emitting surface of first positive lens of camera lens to the display unit is the overall length of the projection lens, the throwing
The overall length of shadow camera lens is TTL, then
tan(HFOV)/TTL>0.015
The telecentricity of the projection lens is Tele, then
Tele<0.5°。
Optionally, first positive lens, first negative lens, second positive lens and the third positive lens
Ranges of indices of refraction is between 1.45-1.75, and abbe number is between 50-70.
Optionally, the effective focal length of the projection lens is f, and the effective focal length of first positive lens is f1, described
The effective focal length of one negative lens is f2, the effective focal length f of second positive lens3, the effective focal length of the third positive lens is
f4, then
1<f/f1< 1.5, -3.5 < f/f2< -2,0.5 < f/f3< 1.6,0.5 < f/f4<1.2。
Optionally, the light-emitting surface of first positive lens at least has first point of inflexion, and first point of inflexion is set
It is placed in first positive lens edge, the incident direction of incidence surface towards the projection ray of first positive lens is raised,
First negative lens is biconcave lens, and second positive lens is biconvex lens, and the third positive lens is concave-convex lens, institute
The light-emitting surface of third positive lens is stated towards the exit direction protrusion of the projection ray, the concave face direction of the third positive lens
The incident direction of the projection ray.
Optionally, first positive lens is biconvex lens, and first negative lens is concave-convex lens, and described first is negative
The exit direction of the light-emitting surface of mirror towards the projection ray is recessed, and the incidence surface of first negative lens is towards the projected light
The incident direction protrusion of line, second positive lens are concave-convex lens, and the light-emitting surface of second positive lens is towards the projection
The exit direction of light is recessed, and the incident direction of incidence surface towards the projection ray of second positive lens is raised, described
At least there is the incidence surface of third positive lens second point of inflexion and/or the light-emitting surface of the third positive lens at least to have
One third point of inflexion, second point of inflexion and the third point of inflexion are set to third positive lens edge, and described
The central area of the light-emitting surface of third positive lens enters light towards projection ray's exit direction protrusion, the third positive lens
The central area in face is recessed towards projection ray's incident direction.
Optionally, first positive lens is biconvex lens, and first negative lens is concave-convex lens, and described first is negative
The exit direction of the light-emitting surface of mirror towards the projection ray is recessed, and the incidence surface of first negative lens is towards the projected light
The incident direction protrusion of line, the light-emitting surface of second positive lens at least have the 4th point of inflexion, the 4th point of inflexion
It is set to second positive lens edge, and the central area of the light-emitting surface of second positive lens goes out towards the projection ray
Direction protrusion is penetrated, the incidence surface of the third positive lens at least has the 5th point of inflexion and/or the third positive lens
Light-emitting surface at least has the 6th point of inflexion, and it is just saturating that the 5th point of inflexion and the 6th point of inflexion are set to the third
Mirror edge, and the central area of the light-emitting surface of the third positive lens is towards projection ray's exit direction protrusion, described the
The central area of the incidence surface of three positive lens is recessed towards projection ray's incident direction, the second positive lens fringe region
Apart from the third positive lens fringe region 0.2mm-0.5mm.
Optionally, first positive lens is biconvex lens, and first negative lens is concave-convex lens, and described first is negative
The exit direction of the light-emitting surface of mirror towards the projection ray is recessed, and the incidence surface of first negative lens is towards the projected light
The incident direction protrusion of line, the light-emitting surface of second positive lens at least have the 7th point of inflexion, the 7th point of inflexion
It is set to second positive lens edge, and the central area of the light-emitting surface of second positive lens goes out towards the projection ray
Direction protrusion is penetrated, the incidence surface of the third positive lens at least has the 8th point of inflexion and/or the third positive lens
Light-emitting surface at least has the 9th point of inflexion, and it is just saturating that the 8th point of inflexion and the 9th point of inflexion are set to the third
Mirror edge, and the central area of the light-emitting surface of the third positive lens is towards projection ray's exit direction protrusion, described the
The central area of the incidence surface of three positive lens is recessed towards projection ray's incident direction, the second positive lens fringe region
Apart from the third positive lens fringe region 0.1mm-0.2mm.
Optionally, the overall length TTL of the projection lens is less than 23mm, and the height of the projection lens vertical direction is DIA,
DIA is less than 11mm.
Optionally, the light-emitting surface of the first positive lens of the projection lens is 5mm apart from the diaphragm, and described first just thoroughly
Mirror, first negative lens, second positive lens and the third positive lens are plastic material.
In addition, to achieve the above object, the present invention also provides a kind of projection display apparatus, comprising: shell and such as institute above
Projection lens is stated, the projection lens is set in the shell.
In technical solution proposed by the present invention, by being disposed in the optical path along diaphragm to display unit direction
For the first positive lens of projection imaging, the first negative lens, the second positive lens and third positive lens, pass through setting projection lens
The ratio between tangent value and projection lens overall length TTL of field angle half HFOV are greater than 0.015 miniaturization for realizing projection lens, simultaneously
The telecentricity Tele of projection lens is set less than 0.5 °, can be improved the image quality of projection lens.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is that the light of projection lens first embodiment of the present invention propagates schematic diagram；
Fig. 2 is the structural schematic diagram of projection lens of the present invention in Fig. 1；
Fig. 3 is the structural schematic diagram of projection lens second embodiment of the present invention；
Fig. 4 is the structural schematic diagram of projection lens 3rd embodiment of the present invention；
Fig. 5 is the structural schematic diagram of projection lens fourth embodiment of the present invention；
Fig. 6 schemes for the MTF of projection lens of the present invention in Fig. 2；
Fig. 7 is the point range figure of projection lens of the present invention in Fig. 2；
Left curvature of field figure and right distortion figure of the Fig. 8 for projection lens of the present invention in Fig. 2；
Fig. 9 is the relative illumination figure of projection lens of the present invention in Fig. 2；
Figure 10 is the defocusing curve figure of projection lens of the present invention in Fig. 2；
Figure 11 schemes for the MTF of projection lens of the present invention in Fig. 3；
Figure 12 is the point range figure of projection lens of the present invention in Fig. 3；
Left curvature of field figure and right distortion figure of the Figure 13 for projection lens of the present invention in Fig. 3；
Figure 14 is the relative illumination figure of projection lens of the present invention in Fig. 3；
Figure 15 is the defocusing curve figure of projection lens of the present invention in Fig. 3；
Figure 16 schemes for the MTF of projection lens of the present invention in Fig. 4；
Figure 17 is the point range figure of projection lens of the present invention in Fig. 4；
Left curvature of field figure and right distortion figure of the Figure 18 for projection lens of the present invention in Fig. 4；
Figure 19 is the relative illumination figure of projection lens of the present invention in Fig. 4；
Figure 20 is the defocusing curve figure of projection lens of the present invention in Fig. 4；
Figure 21 schemes for the MTF of projection lens of the present invention in Fig. 5；
Figure 22 is the point range figure of projection lens of the present invention in Fig. 5；
Left curvature of field figure and right distortion figure of the Figure 23 for projection lens of the present invention in Fig. 5；
Figure 24 is the relative illumination figure of projection lens of the present invention in Fig. 5；
Figure 25 is the defocusing curve figure of projection lens of the present invention in Fig. 5.
Drawing reference numeral explanation:
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as
Its relative importance of indication or suggestion or the quantity for implicitly indicating indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple " contain
Justice is at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. shall be understood in a broad sense,
For example, " fixation " may be a fixed connection, it may be a detachable connection, or integral；It can be mechanical connection, be also possible to
Electrical connection；It can be directly connected, the connection inside two elements or two can also be can be indirectly connected through an intermediary
The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
It in addition, the technical solution between each embodiment of the present invention can be combined with each other, but must be general with this field
Based on logical technical staff can be realized, it will be understood that when the combination of technical solution appearance is conflicting or cannot achieve this
The combination of technical solution is not present, also not the present invention claims protection scope within.
Fig. 1 and Fig. 2, projection lens proposed by the present invention are please referred to, projection lens is used to receive the transmitting of display unit 800
Projection lens directive diaphragm 100 passes through in projection ray 900, projection ray 900, and projection lens includes: single to display along diaphragm 100
In the optical path in first 800 directions, it is being disposed with the first positive lens 200 for projection imaging, the first negative lens 300, second just
Lens 400 and third positive lens 500.
The field angle for defining projection lens is FOV, and the field angle half of projection lens is HFOV, and the first of projection lens is just
The display imaging surface of the light-emitting surface of lens 200 to display unit 800 is the overall length of projection lens, and the overall length of projection lens is TTL,
Then
tan(HFOV)/TTL>0.015
The telecentricity of projection lens is Tele, then
Tele<0.5°。
In technical solution proposed by the present invention, by the optical path along diaphragm 100 to 800 direction of display unit, successively
It is provided with the first positive lens 200 for projection imaging, the first negative lens 300, the second positive lens 400 and third positive lens 500,
It is greater than 0.015 by the ratio between tangent value and the projection lens overall length TTL that set the field angle half HFOV of projection lens and realizes throwing
The miniaturization of shadow camera lens concurrently sets the telecentricity Tele of projection lens less than 0.5 °, can be improved projection lens at image quality
Amount.
Further, the folding of the first positive lens 200, the first negative lens 300, the second positive lens 400 and third positive lens 500
The rate range of penetrating is between 1.45-1.75, and abbe number is between 50-70, from there through the first positive lens 200 of control, the
The refractive index and abbe number of one negative lens 300, the second positive lens 400 and third positive lens 500, can be improved projection lens
Image quality.
Further, the effective focal length of projection lens is f, and the effective focal length of the first positive lens 200 is f1, the first negative lens
300 effective focal length is f2, the effective focal length f of the second positive lens 4003, the effective focal length of third positive lens 500 is f4, then
1<f/f1< 1.5, -3.5 < f/f2< -2,0.5 < f/f3< 1.6,0.5 < f/f4< 1.2, pass through having for control projection lens
Imitate focal length, respectively with the effective focal length of the first positive lens 200, the effective focal length of the first negative lens 300, the second positive lens 400
The ratio range of effective focal length and the effective focal length of third positive lens 500, miniaturises projection lens, improves simultaneously
The image quality of projection lens.
Refering to shown in Fig. 6-Figure 10, the light-emitting surface of the first positive lens 200 at least has first point of inflexion 210, and first
The point of inflexion 210 is set to 200 edge of the first positive lens, and the incidence surface of the first positive lens 200 is towards the incidence side of projection ray 900
To protrusion, the first negative lens 300 is biconcave lens, and the second positive lens 400 is biconvex lens, and third positive lens 500 is concave-convex saturating
Mirror, exit direction protrusion of the light-emitting surface of third positive lens 500 towards projection ray 900, the concave face court of third positive lens 500
To the incident direction of projection ray 900, the point of inflexion is generally used for correction off-axis aberration, thus improves the miniaturization of projection lens,
The image quality of projection lens is improved simultaneously, and wherein Fig. 6 is MTF modulation transfer function figure, is a kind of side for analyzing lens quality
Method is mainly used for response imaging clarity, and mtf value is higher, and it is more clear to be imaged, and Fig. 7 is the point range figure of projection lens, perfect optics
System should be a picture point in image planes, however optical system all has aberration, cause finally be imaged as an image patch,
Point range figure mainly reflects the aberration situation of camera lens；Left figure is the curvature of the image situation that curvature of field figure reflects imaging clearly, right figure in Fig. 8
For distortion figure, reflect the deformation situation of imaging；Fig. 9 is a relative illumination figure, for reflecting the brightness uniformity situation of imaging；Figure
10 be defocusing curve figure, the relational graph of different image planes positions and different visual field MTF.
Refering to shown in Fig. 3 and Figure 11-Figure 15, the first positive lens 200 is biconvex lens, and the first negative lens 300 is concave-convex saturating
The exit direction of mirror, light-emitting surface towards the projection ray 900 of the first negative lens 300 is recessed, the incidence surface court of the first negative lens 300
To the incident direction protrusion of projection ray 900, the second positive lens 400 is concave-convex lens, the light-emitting surface direction of the second positive lens 400
The exit direction of projection ray 900 is recessed, and the incident direction of incidence surface towards the projection ray 900 of the second positive lens 400 is raised,
The incidence surface of third positive lens 500 at least has the light-emitting surface of second point of inflexion 510 and/or third positive lens 500 at least
With a third point of inflexion 520, second point of inflexion 510 and the third point of inflexion 520 are set to 500 edge of third positive lens, and
The central area of the light-emitting surface of third positive lens 500 enters towards projection ray's 900 exit direction protrusion, third positive lens 500
The central area of smooth surface is recessed towards 900 incident direction of projection ray, thus improves the miniaturization of projection lens, while improving throwing
The image quality of shadow camera lens, wherein Figure 11 is MTF modulation transfer function figure, is a kind of method for analyzing lens quality, main to use
In response imaging clarity, mtf value is higher, and it is more clear to be imaged, and Figure 12 is the point range figure of projection lens, and perfect optical system is in picture
It should be a picture point on face, however optical system all has aberration, causes finally be imaged as an image patch, point range figure master
Reflect the aberration situation of camera lens；Left figure is the curvature of the image situation that curvature of field figure reflects imaging clearly in Figure 13, and right figure is distortion
Figure, reflects the deformation situation of imaging；Figure 14 is a relative illumination figure, for reflecting the brightness uniformity situation of imaging；Figure 15 is
Defocusing curve figure, the MTF relational graph of different image planes positions and different visual fields.
Refering to shown in Fig. 4 and Figure 16-Figure 20, the first positive lens 200 is biconvex lens, and the first negative lens 300 is concave-convex saturating
The exit direction of mirror, light-emitting surface towards the projection ray 900 of the first negative lens 300 is recessed, the incidence surface court of the first negative lens 300
To the incident direction protrusion of projection ray 900, the light-emitting surface of the second positive lens 400 at least has the 4th point of inflexion 410, the
Four points of inflexion 410 are set to 400 edge of the second positive lens, and the central area direction projection of the light-emitting surface of the second positive lens 400
Light 900 exit direction protrusion, the incidence surface of third positive lens 500 at least have the 5th point of inflexion 530 and/or third
The light-emitting surface of positive lens 500 at least has the 6th point of inflexion 540, and the 5th point of inflexion 530 and the 6th point of inflexion 540 are set to
500 edge of third positive lens, and the central area of the light-emitting surface of third positive lens 500 is convex towards 900 exit direction of projection ray
It rises, the central area of the incidence surface of third positive lens 500 is recessed towards 900 incident direction of projection ray, 400 side of the second positive lens
Thus 500 fringe region 0.2mm-0.5mm of edge region distance third positive lens improves the miniaturization of projection lens, improves simultaneously
The image quality of projection lens, wherein Figure 16 is MTF modulation transfer function figure, is a kind of method for analyzing lens quality, mainly
For response imaging clarity, mtf value is higher, and it is more clear to be imaged, and Figure 17 is the point range figure of projection lens, and perfect optical system exists
It should be a picture point in image planes, however optical system all has aberration, causes finally be imaged as an image patch, point range figure
The aberration situation of main reflection camera lens；Left figure is the curvature of the image situation that curvature of field figure reflects imaging clearly in Figure 18, and right figure is abnormal
Become figure, reflects the deformation situation of imaging；Figure 19 is a relative illumination figure, for reflecting the brightness uniformity situation of imaging；Figure 20
For defocusing curve figure, the MTF relational graph of different image planes positions and different visual fields.
Refering to shown in Fig. 5 and Figure 21-Figure 25, the first positive lens 200 is biconvex lens, and the first negative lens 300 is concave-convex saturating
The exit direction of mirror, light-emitting surface towards the projection ray 900 of the first negative lens 300 is recessed, the incidence surface court of the first negative lens 300
To the incident direction protrusion of projection ray 900, the light-emitting surface of the second positive lens 400 at least has the 7th point of inflexion 420, the
Seven points of inflexion 420 are set to 400 edge of the second positive lens, and the central area direction projection of the light-emitting surface of the second positive lens 400
Light 900 exit direction protrusion, the incidence surface of third positive lens 500 at least have the 8th point of inflexion 550 and/or third
The light-emitting surface of positive lens 500 at least has the 9th point of inflexion 560, and the 8th point of inflexion 550 and the 9th point of inflexion 560 are set to
500 edge of third positive lens, and the central area of the light-emitting surface of third positive lens 500 is convex towards 900 exit direction of projection ray
It rises, the central area of the incidence surface of third positive lens 500 is recessed towards 900 incident direction of projection ray, 400 side of the second positive lens
Thus 500 fringe region 0.1mm-0.2mm of edge region distance third positive lens improves the miniaturization of projection lens, improves simultaneously
The image quality of projection lens, wherein Figure 21 is MTF modulation transfer function figure, is a kind of method for analyzing lens quality, mainly
For response imaging clarity, mtf value is higher, and it is more clear to be imaged, and Figure 22 is the point range figure of projection lens, and perfect optical system exists
It should be a picture point in image planes, however optical system all has aberration, causes finally be imaged as an image patch, point range figure
The aberration situation of main reflection camera lens；Left figure is the curvature of the image situation that curvature of field figure reflects imaging clearly in Figure 23, and right figure is abnormal
Become figure, reflects the deformation situation of imaging；Figure 24 is a relative illumination figure, for reflecting the brightness uniformity situation of imaging；Figure 25
For defocusing curve figure, the MTF relational graph of different image planes positions and different visual fields.
Further, the overall length TTL of projection lens is less than 23mm, and the height of projection lens vertical direction is DIA, and DIA is small
It is small less than 23mm, and the height DIA of control projection lens vertical direction by the overall length TTL for controlling projection lens in 11mm
In 11mm, the size of projection lens can be effectively limited, is conducive to miniaturization.
Further, distance of the light-emitting surface of the first positive lens 200 of projection lens apart from diaphragm 100 is 5mm, and first just
Lens 200, the first negative 300 mirror, the second positive lens 400 and third positive lens 500 are plastic material, such as plastic material
For materials such as OKP1, APEL or E48R, plastic material is easy to process, and cost is relatively low, at the same can injection molding as needed, just
In processing and manufacturing labyrinth figure.
The present invention also provides a kind of projection display apparatus, comprising: shell (not shown) and projection lens, projection lens setting
In in shell, projection lens is used to receive the projection ray 900 of the transmitting of display unit 800, and projection lens passes through in projection ray 900
Directive diaphragm 100, projection lens include: to be disposed with along the optical path of diaphragm 100 to 800 direction of display unit for throwing
The first positive lens 200, the first negative lens 300, the second positive lens 400 and the third positive lens 500 of shadow imaging, define projection lens
Field angle be FOV, the field angle half of projection lens is HFOV, and the light-emitting surface of the first positive lens 200 of projection lens is to aobvious
The display imaging surface for showing unit 800 is the overall length of projection lens, and the overall length of projection lens is TTL, then tan (HFOV)/TTL >
0.015, the telecentricity of projection lens is Tele, then Tele < 0.5 °.
In the technical solution that the present embodiment proposes, by the optical path along diaphragm 100 to 800 direction of display unit, according to
It is secondary to be provided with the first positive lens 200 for projection imaging, the first negative lens 300, the second positive lens 400 and third positive lens
500, it is real to be greater than 0.015 by the ratio between tangent value and the projection lens overall length TTL that set the field angle half HFOV of projection lens
The miniaturization of existing projection lens, concurrently sets the telecentricity Tele of projection lens less than 0.5 °, can be improved projection lens at
Image quality amount.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all in the present invention
Inventive concept under, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/be used in it indirectly
He is included in scope of patent protection of the invention relevant technical field.
Claims (10)
1. a kind of projection lens, which is characterized in that the projection lens is used to receive the projection ray of display unit transmitting, described
The projection lens directive diaphragm passes through in projection ray, and the projection lens includes:
Along the diaphragm to the display unit direction, it is disposed with the first positive lens for projection imaging, first negative
Mirror, the second positive lens and third positive lens；
The field angle for defining the projection lens is FOV, and the field angle half of the projection lens is HFOV, the projection lens
The first positive lens light-emitting surface to the display unit display imaging surface be the projection lens overall length, the projection lens
The overall length of head is TTL, then
Tan (HFOV)/TTL > 0.015
The telecentricity of the projection lens is Tele, then
0.5 ° of Tele <.
2. projection lens as described in claim 1, which is characterized in that first positive lens, first negative lens, described
The ranges of indices of refraction of second positive lens and the third positive lens between 1.45-1.75, abbe number 50-70 it
Between.
3. projection lens as claimed in claim 2, which is characterized in that the effective focal length of the projection lens be f, described first
The effective focal length of positive lens is f1, and the effective focal length of first negative lens is f2, the effective focal length f of second positive lens3,
The effective focal length of the third positive lens is f4, then
1 < f/f11.5, -3.5 < f/f of <2< -2,0.5 < f/f31.6,0.5 < f/f of <4< 1.2.
4. projection lens as claimed in claim 3, which is characterized in that the light-emitting surface of first positive lens at least has one
First point of inflexion, first point of inflexion are set to first positive lens edge, the incidence surface direction of first positive lens
The incident direction protrusion of the projection ray, first negative lens are biconcave lens, and second positive lens is biconvex lens,
The third positive lens is concave-convex lens, and the exit direction of light-emitting surface towards the projection ray of the third positive lens is convex
It rises, the incident direction of the concave face of the third positive lens towards the projection ray.
5. projection lens as claimed in claim 3, which is characterized in that first positive lens be biconvex lens, described first
Negative lens is concave-convex lens, and the exit direction of the light-emitting surface of first negative lens towards the projection ray is recessed, described the
For the incidence surface of one negative lens towards the incident direction protrusion of the projection ray, second positive lens is concave-convex lens, described
The exit direction of the light-emitting surface of second positive lens towards the projection ray is recessed, and the incidence surface of second positive lens is towards institute
The incident direction protrusion of projection ray is stated, the incidence surface of the third positive lens at least has second point of inflexion and/or institute
The light-emitting surface for stating third positive lens at least has a third point of inflexion, second point of inflexion and third point of inflexion setting
In third positive lens edge, and the central area of the light-emitting surface of the third positive lens is towards outgoing side, the projection ray
To protrusion, the central area of the incidence surface of the third positive lens is recessed towards projection ray's incident direction.
6. projection lens as claimed in claim 3, which is characterized in that first positive lens be biconvex lens, described first
Negative lens is concave-convex lens, and the exit direction of the light-emitting surface of first negative lens towards the projection ray is recessed, described the
The incident direction of the incidence surface of one negative lens towards the projection ray is raised, and the light-emitting surface of second positive lens at least has
One the 4th point of inflexion, the 4th point of inflexion are set to second positive lens edge, and the light out of second positive lens
Towards projection ray's exit direction protrusion, the incidence surface of the third positive lens at least has one for the central area in face
The light-emitting surface of five points of inflexion and/or the third positive lens at least has the 6th point of inflexion, the 5th point of inflexion and institute
It states the 6th point of inflexion and is set to third positive lens edge, and the central area of the light-emitting surface of the third positive lens is towards institute
State projection ray exit direction protrusion, the central area of the incidence surface of the third positive lens is towards incidence side, the projection ray
To recess, the second positive lens fringe region is apart from the third positive lens fringe region 0.2mm-0.5mm.
7. projection lens as claimed in claim 3, which is characterized in that first positive lens be biconvex lens, described first
Negative lens is concave-convex lens, and the exit direction of the light-emitting surface of first negative lens towards the projection ray is recessed, described the
The incident direction of the incidence surface of one negative lens towards the projection ray is raised, and the light-emitting surface of second positive lens at least has
One the 7th point of inflexion, the 7th point of inflexion are set to second positive lens edge, and the light out of second positive lens
Towards projection ray's exit direction protrusion, the incidence surface of the third positive lens at least has one for the central area in face
The light-emitting surface of eight points of inflexion and/or the third positive lens at least has the 9th point of inflexion, the 8th point of inflexion and institute
It states the 9th point of inflexion and is set to third positive lens edge, and the central area of the light-emitting surface of the third positive lens is towards institute
State projection ray exit direction protrusion, the central area of the incidence surface of the third positive lens is towards incidence side, the projection ray
To recess, the second positive lens fringe region is apart from the third positive lens fringe region 0.1mm-0.2mm.
8. such as the described in any item projection lens of claim 1-7, which is characterized in that the overall length TTL of the projection lens is less than
23mm, the height of the projection lens vertical direction are DIA, and DIA is less than 11mm.
9. such as the described in any item projection lens of claim 1-7, which is characterized in that the first positive lens of the projection lens
Light-emitting surface is 5mm, first positive lens, first negative lens, second positive lens and described apart from the diaphragm
Third positive lens is plastic material.
10. a kind of projection display apparatus characterized by comprising shell and the projection lens as described in claim any one of 1-9
Head, the projection lens are set in the shell.
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| CN201910499899.9A CN110161657B (en) | 2019-06-06 | 2019-06-06 | Projection lens and projection display device |
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| CN201910499899.9A CN110161657B (en) | 2019-06-06 | 2019-06-06 | Projection lens and projection display device |
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| CN110161657A true CN110161657A (en) | 2019-08-23 |
| CN110161657B CN110161657B (en) | 2021-07-23 |
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| CN110161657B (en) | 2021-07-23 |
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