CN106200238B - Imaging optical path system - Google Patents
Imaging optical path system Download PDFInfo
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- CN106200238B CN106200238B CN201610822330.8A CN201610822330A CN106200238B CN 106200238 B CN106200238 B CN 106200238B CN 201610822330 A CN201610822330 A CN 201610822330A CN 106200238 B CN106200238 B CN 106200238B
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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
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
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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
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
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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
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a kind of imaging optical path systems, belong to field of projection display.Imaging optical path system, including light source, illumination path and light valve, wherein, the illumination path is two-part subsystem, including leading portion subsystem and back segment subsystem, leading portion subsystem is used to receive the illuminating bundle of the light source offer with the first parallel light emergence, and converge to first collimated light beam in the object space focal plane of back segment subsystem, the light beam after back segment subsystem is used to assemble is converted into the second collimated light beam, and second collimated light beam is incident to light valve light-entering surface according to predetermined angle.The tolerance and adjustable of system can be improved in imaging optical path system provided by the invention, is more advantageous to the adjustment for realizing image quality.
Description
Technical field
The present invention relates to field of projection display, in particular to a kind of imaging optical path system.
Background technique
DLP (English: Digital Light Processing；Referred to as: DLP, optical digital computing) projector is a kind of
High-precision projector, comprising: light source, imaging optical path system, digital micro-mirror device (English: Digital Micromirror
Device；Referred to as: DMD) and camera lens etc..Wherein, DMD is the core component of DLP projector, including control unit, rectangle base
Multiple light valves (also referred to as micromirror) of piece and over the substrate array arrangement, which can be according in projection image signal
Hold and controls the deflection that positive negative direction occurs for multiple light valves.
As shown in Figure 1, the three primary colours light for the timing that light source 10 provides is via illumination path in current DLP projector
System (being not drawn into Fig. 1) is radiated on the substrate 201 of DMD20 in the micromirror of array, wherein is radiated at positive direction rotation
Light beam on light valve 202 can be reflected on camera lens 30, and the light beam being radiated on the light valve 203 of negative direction rotation can be launched into
It in light absorption units 40, is absorbed, will not be projected in camera lens by light absorption units 40, so that it is bright to form entire projected image color
Dark different display effect.In above-mentioned projection process, if the received beam uniformity of projection lens is poor, such as brightness degree or
Uniformity of chromaticity is poor, and contrast is low, or because of machining eyeglass reason, and light beam fails the best region processing by eyeglass and goes out
It penetrates or eyeglass is to beam treatment inherent shortcoming, will cause a point field of view image blur, or distortion, these final presence
In the incident such as projection lens of the imaging beam meeting of defect, and above situation is inevitably encountered in Optical System Design
, and when encountering these situations, even if projection lens has stronger aberration correcting capability and higher resolution, it is also difficult to shape
At the projected image of high quality.
The design relation of imaging optical path system to projected image image quality, for these reasons, imaging optical path system
Eyeglass between be generally mated close relation, design accuracy require it is high, once be difficult to debug after the completion of design, when encountering multiple views
When field image quality is unbalanced, it can not be adjusted, cause whole image quality not high.
It needs to provide a kind of imaging optical path system, overcomes above-mentioned technological deficiency.
Summary of the invention
In order to solve the technical issues of imaging optical path system imaging quality of the prior art can not adjust, the embodiment of the present invention
A kind of imaging optical path system is provided, tolerance and adjustable are improved, convenient for being adjusted to image quality, to improve
Whole image quality.
To realize the above-mentioned technical purpose, as follows using technical solution:
On the one hand, a kind of imaging optical path system is provided, the imaging optical path system includes:
Light source, for providing illuminating bundle；
Illumination path, the illuminating bundle for providing light source are incident to light valve light-entering surface according to predetermined angle,
Light valve, for receiving the predetermined angle light beam of illumination path sending, and according to image display control signal reflected light
Beam enters projection lens imaging；
Wherein, illumination path includes leading portion subsystem and back segment subsystem, and leading portion subsystem includes m piece eyeglass, rear cross-talk
System includes n piece eyeglass, wherein 0 < m≤2,0 < n≤2,
Leading portion subsystem is used to receive the illuminating bundle of light source offer with the first parallel light emergence, and by the first collimated light beam
It converging in the object space focal plane of back segment subsystem, the light beam after back segment subsystem is used to assemble is converted into the second collimated light beam,
And the second collimated light beam is incident to light valve light-entering surface according to predetermined angle；
Further, further includes: homogenizer, homogenizer are used between light source and leading portion subsystem by light source
The illuminating bundle of sending is incident to leading portion subsystem after homogenizing；
The length direction of homogenizer is parallel to the length direction of light valve square surface；
Further, m=2, leading portion subsystem include 2 eyeglasses, and 2 eyeglasses are spherical mirror；
Further, n=2, back segment subsystem include 2 eyeglasses, and 2 eyeglasses are that aspherical mirror or 2 eyeglasses are equal
For spherical mirror, alternatively, n=1, back segment subsystem includes 1 eyeglass, and 1 eyeglass is aspherical mirror；
Further, back segment subsystem further include: TIR prism,
N piece eyeglass is used to carry out the light beam that leading portion subsystem issues convergence and handles to obtain the second collimated light beam, and by the
On two parallel beam incidents to TIR prism, by TIR prism by the second parallel beam incident to light valve light-entering surface；
Further, TIR prism is made of two triangular prisms, and TIR prism is also used to by the second parallel beam incident
To light valve light-entering surface, the third collimated light beam of light valve light-entering surface reflection is received, and third collimated light beam is reflexed into throwing
Shadow camera lens；
It further, further include spacing reflection mirror, spacing reflection mirror is used between leading portion subsystem and back segment subsystem
Optical path between turnover leading portion subsystem and back segment subsystem；
Further, in preset coordinate system, the direction transmitted in leading portion subsystem using light is located at vertical Z as Z axis
In the plane of axis, and two axis being respectively perpendicular are X-axis and Y-axis；
Spacing reflection mirror includes the first reflecting mirror and the second reflecting mirror, and the angle of the first reflecting mirror and X-axis is 45 degree, and second
Reflecting mirror and the angle of Y-axis are 25~60 degree；
Alternatively, spacing reflection mirror includes third reflecting mirror, third reflecting mirror with 45 degree of X-axis angle；
Further, it is removed on TIR prism and n piece eyeglass adjacent surface and light valve light-entering surface adjacent surface and and projection lens
Delustring paint is coated on 3 outer surfaces except adjacent；And/or TIR prism is used to be emitted the light-emitting surface of third collimated light beam
On be provided with light barrier, through-hole is provided on light barrier, through-hole is equal with the facula area that third collimated light beam is formed；
Further, predetermined angle are as follows: incident angle of the primary optical axis of the second collimated light beam relative to light valve light-entering surface,
Incident angle range is 34 degree.
Further, light source includes the laser light source of at least one color.
Technical solution provided in an embodiment of the present invention at least has the advantages that
Imaging optical path system provided in an embodiment of the present invention, light source issue illuminating bundle, and light valve receives the light of illumination path
Beam and projecting is imaged into projection lens, wherein by the way that illumination path is divided into two-part system architecture, leading portion subsystem and
What is transmitted between back segment subsystem is collimated light beam, and front and back isolation of system is opened, and is adjusted separately and two subsystems are mutual
It is smaller by being influenced, it can be improved the imaging optical path system margins, adjustable is more advantageous to the tune for realizing image quality
It is whole.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of structural schematic diagram of traditional DLP projector.
Fig. 2 is a kind of structural schematic diagram for imaging optical path system that an illustrative examples of the invention provide.
Fig. 3 is the light path schematic diagram of the objective point imaging on a kind of homogenizer that an illustrative examples of the invention provide.
Fig. 4 is the structural schematic diagram for another imaging optical path system that an illustrative examples of the invention provide.
Fig. 5 is a kind of structural schematic diagram for TIR prism that an illustrative examples of the invention provide.
Fig. 6 is the structural schematic diagram for another imaging optical path system that an illustrative examples of the invention provide.
Fig. 7 is the structural schematic diagram that delustring paint is coated on a kind of TIR prism that an of the invention illustrative examples provide.
Fig. 8 is the light spot illumination figure of the software simulation before the system optimization change that an illustrative examples of the invention provide.
Fig. 9 is the light spot illumination figure of the software simulation after the system optimization change that an illustrative examples of the invention provide.
Figure 10 is the uniformity of the imaging optical path system after the system optimization change that an illustrative examples of the invention provide
Schematic diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is made to be described in detail in a specific implementation.
The embodiment of the present invention provides a kind of imaging optical path system, as shown in Fig. 2, the imaging optical path system can be telecentricity light
System.Imaging optical path system includes:
Light source 10, for providing illuminating bundle；Specifically, light source 10 may include the laser light source of at least one color,
Such as blue laser light source and fluorescent light source or LED light source or blue laser light source, red laser light source and fluorescence
Light source or LED light source or three color laser light sources, in this embodiment, light source 10 provide the three primary colours light illuminating bundle of timing.
Illumination path 20, the illuminating bundle for providing light source 10 are incident to light valve 30 according to predetermined angle and enter light table
Face,
Light valve 30, for receiving the predetermined angle light beam of the sending of illumination path 20, and it is anti-according to image display control signal
It penetrates the received light beam in its surface and enters the imaging of projection lens (not shown)；In this embodiment, light valve 30 is dmd chip.DMD
Chip is optical modulation element, and surface is made of thousands of tiny mirror, to receive without several light, and by light
Reflection projects in projection lens.
Wherein, illumination path 20 includes leading portion subsystem 21 and back segment subsystem 22, and leading portion subsystem 21 includes m piece mirror
Piece, wherein 0 < m≤2, for example, as shown in Figure 2 or Figure 3, leading portion subsystem may include 2 eyeglasses, which is spherical surface
Mirror.And back segment subsystem 22 includes n piece eyeglass, wherein 0 < n≤2, for example, as shown in Figure 2 or Figure 3, back segment subsystem can be with
Including 2 eyeglasses, 2 eyeglasses are aspherical mirror or 2 eyeglasses are spherical mirror.
In another example 1 eyeglass is aspherical mirror as shown in figure 4, back segment subsystem includes 1 eyeglass.In practical application,
Eyeglass number and other settings in leading portion subsystem and back segment subsystem can also be adjusted as the case may be, and Fig. 2 is extremely
Fig. 4 is only schematically illustrated, and imaging optical path system provided in an embodiment of the present invention uses two-piece design and eyeglass number is less
Optics framework is also beneficial to adjustment image quality.
During paths, leading portion subsystem 21 is used to receive the illuminating bundle of the offer of light source 10 with the first directional light
Outgoing, and the first collimated light beam converged in the object space focal plane of back segment subsystem 22, after back segment subsystem 22 is for assembling
Light beam be converted into the second collimated light beam, and the second collimated light beam is incident to 30 light-entering surface of light valve according to predetermined angle.Its
In, object space focal plane referred to object focus and the plane perpendicular to system primary optical axis, and the object space coke of back segment subsystem 22 is flat
Face referred to the object focus of the back segment subsystem and the plane perpendicular to system primary optical axis.
Since imaging optical path system is telecentric optical system, and leading portion subsystem is used for the first directional light for emitting light source
Beam converges in the object space focal plane of back segment subsystem, therefore what is transmitted between leading portion subsystem and back segment subsystem is directional light
Beam, the collimated light beam refer to that the light that same picture point issues is directional light.
In practical application, imaging optical path system can also include: homogenizer 11, which can be photoconductive tube
Or optical wand, between light source 10 and leading portion subsystem 21, the illuminating bundle for issuing light source 10 is incident to after homogenizing
Leading portion subsystem 21.In a specific implementation, the illuminating bundle with dispersion angle that light source 10 issues passes through homogenizer 11
Degree of homogenizing improves after multiple internal reflection, so that the hot spot uniformity for being incident to 30 surface of light valve after illumination path 20 also mentions
It rises, the brightness uniformity of projection imaging also increases accordingly.
And the length direction of homogenizer 11 is parallel to the length direction of 30 square surface of light valve.
In telecentric beam path framework, as shown in any figure of Fig. 2 to Fig. 4, back segment subsystem 22 further include: total internal reflection (English
Text: Total Internal Reflection；The n piece eyeglass of referred to as: TIR) prism 221, back segment subsystem 22 is used for preceding cross-talk
The convergent beam that system 21 emits is handled to obtain the second collimated light beam, and by the second parallel beam incident to TIR prism 221
On, by TIR prism 221 by the second parallel beam incident to the light-entering surface of light valve 30.It is exemplary, the light beam of the first collimated light beam
Angle can be 23 ° -28 °, and the angle for being incident on the chief ray in DMD light valve face can be 34 °, that is to say the master of the second collimated light beam
The incident angle of optical axis is 34 °.
In a specific implementation, as shown in figure 5, TIR prism 221 is made of two triangular prisms (also referred to as prism), Fig. 5
In, two triangular prisms include the first TIR prism 2211 and the second TIR prism 2212, wherein the first TIR prism 2211 is compared
In the second TIR prism 2212 closer to the n piece eyeglass of back segment subsystem 22, three sides (three of first TIR prism 2211
Face where every two adjacent rib is a side in rib) it include first side P1, second side P2 and third side P3, second
Three sides (face where every two adjacent rib is a side in three ribs) of TIR prism 2212 include the 4th side P4,
5th side P5 and the 6th side P6, first side P1 are the incidence surface of the first TIR prism 221, the light-emitting surface with the n piece eyeglass
Relatively, second side P2 and 30 light-entering surface of light valve be opposite and parallel, the 4th side P4 of third side P3 and the second TIR prism
There are gaps, and gap is 5~8um, wherein the area of the 4th side P4 is less than the area of third side P3, the 5th side P5
It is parallel with the incidence surface of camera lens respectively, it is also parallel with 30 light-entering surface of light valve.Wherein, the folder of second side P2 and third side P3
It is a2, a1 and a2 is to enter what angular designed according to light valve 30 that angle, which is the angle of a1, first side P1 and third side P3,
That is, a1 and a2 to it is above-mentioned preset it is related into angular.In practical application, angle a2 < 32.64 °.For example, can be 30 °.
In embodiments of the present invention, the light-emitting surface of homogenizer 11 is object plane, and light valve face is image planes.11 object plane of homogenizer
On the chief ray of each object point be parallel to each other, object point is imaged on light valve face becomes picture point.Each object point of homogenizer goes out
The light penetrated has dispersion angle, and the light with dispersion angle is converted directional light by leading portion subsystem 21.
As shown in figure 3, the light that object point R launches has certain diverging by taking a certain object point R of homogenizer as an example
Angle becomes directional light by leading portion subsystem 21, and directional light is incident on the TIR prism of back segment subsystem 22, TIR prism
Directional light is reflexed on 30 light-entering surface of light valve, point R ' is converted on 30 light-entering surface of light valve, is assembled on light valve face
Point R ' is the picture point that object point R is imaged on light valve face.From the figure 3, it may be seen that aperture is set to the object space focal plane of leading portion subsystem 21,
The light ray parallel of the same visual field of leading portion subsystem 21 is emitted.
In embodiments of the present invention, it is directional light that DMD light valve, which is incident on the light beam of camera lens, for camera lens, mirror
Received light is directional light, even if the homogenizer of front end and imaging optical path system call interception change, influences to be not transferred to
Camera lens, to not influence the imaging capability of camera lens.
Further, camera lens receives the benefit of directional light further include: and non-parallel light can bring aberration, and directional light is incident,
Camera lens is equivalent to infinite distance imaging, aberration is not present, so that the imaging effect of camera lens is more preferable.
In embodiments of the present invention, the optical power range (inverse of focal length) of leading portion subsystem and back segment subsystem, can root
Determine that it is not limited in the embodiment of the present invention according to system requirements, wherein focal power is for characterizing optical system deviation light
Ability.
In a specific implementation, as shown in fig. 6, the region that heavy line surrounds in Fig. 6 indicates the light of the imaging optical path system
Beam trend (is not that the optical path being incident in camera lens is walked it should be noted that being the optical path trend of the emergent light of light source in Fig. 6
To), TIR prism 221 is also used to after the second collimated light beam G1 is incident to the light-entering surface of light valve 30 in Fig. 6, receives light valve
The third collimated light beam G2 of 30 reflections, and third collimated light beam G2 is reflexed to the camera lens of DLP projector (Fig. 6 is not drawn into).
And as shown in fig. 6, on TIR prism 221 (third side P3, the 4th side P4 and the 6th side P6 in such as Fig. 5)
Coated with delustring paint F, off light is absorbed, and reduces the injection of stray light, specifically, Fig. 7 is TIR provided in an embodiment of the present invention
The structural schematic diagram of delustring paint is coated on prism, as shown in fig. 7, TIR prism 221 is removed with n piece eyeglass adjacent surface, with light valve
Light-entering surface adjacent surface and be coated with delustring paint on camera lens adjacent surface, wherein oblique line in Fig. 7 on TIR prism 221 indicates
Delustring paint；And/or TIR prism 221 be used for be emitted third collimated light beam G2 light-emitting surface (namely the imaging optical path system go out
Smooth surface, such as the 5th side P5 in Fig. 5) on be provided with light barrier C, be provided with through-hole on light barrier C, through-hole and third directional light
The facula area that beam is formed is equal (may exist certain error in practical application), so that other spuious photo-electric switches be avoided
Stray light enters camera lens.It can effectively improve the system contrast of projection imaging in this way.
Due to having used TIR prism in telecentric beam path framework, as shown in the optic path of TIR prism in Fig. 2 or 4, TIR
Prism is triangular prism, has inclination angle, different light are caused with different processing light paths, so that the image quality of different visual fields
It has differences.To the inherent shortcoming because of TIR prism, will lead to further away from spheric glass (illumination path back segment subsystem in Fig. 2
In in last a piece of eyeglass) direction, image quality is poorer, system asymmetric so as to cause the hot spot for being incident on DMD light valve face
Uniformity reduces, to also system effectiveness be caused to reduce, and due to the original of other optical mirror slips processing and assembly precision in system
Cause, also will affect the uniformity and symmetrical degree for being incident to the hot spot in DMD light valve face, and above-mentioned reason eventually leads to different visual fields
Image quality has differences, wherein understanding that visual field can be popular it is observed that object plane range size, wherein imaging system
Focal length is shorter, and visual field is bigger, therefore in ultrashort out-of-focus projection, visual field is larger.Visual field is usually the circle plane of symmetry, different visual field portions
Subregion can be described as a point visual field.
In embodiments of the present invention, the design of two-part system is carried out for the illumination path of imaging optical path system, by front and back
Isolation of system is opened, and is adjusted separately, and realization more preferably image quality is more advantageous to, in conjunction with imaging optical path system provided in an embodiment of the present invention
The two-piece design scheme of system can carry out system optimization using point visual field control image quality method.
Specifically, the poor region of image quality and image quality first can be divided into imaging optical path system according to image quality
The system parameter in poor region is imaged in preferable region, adjustment, such as the face type of eyeglass, spacing or quantity of eyeglass etc., from
And the difference degree in the preferable region of image quality and the poor region of image quality is reduced, so that whole image quality is reached balanced shape
State, to improve the working efficiency and uniformity of system.And due to imaging optical path service system provided in an embodiment of the present invention
Parameter has adjustable, is able to carry out the adjustment of regional imaging quality, improves whole image quality.
It should be noted that dividing the poor preferable region in region and image quality of image quality can shine according to hot spot
Degree figure, as shown in figure 8, Fig. 8 is the light spot illumination figure of the software simulation before system optimization change, the system of the imaging optical path system
State before optimization change can be as shown in figure 8, Fig. 8 reflects overfill (spill-over) state of imaging optical path system, wherein
Overfill state refers to that the facula area being irradiated on the light-entering surface of light valve is slightly larger than in order to avoid image has blanking bar
The size of the light valve of DMD, so that irradiation on DMD is in and is completely full of state.Light spot illumination figure rectangular frame-shaped in Fig. 8, it is right
Half part is obviously big compared with left-half, illustrates that the imaging on DMD has fuzzy and deformation.It therefore, can be by right side in Fig. 8
The region of corresponding imaging optical path system is divided to be determined as the poor region of image quality, by the corresponding imaging of left-half in Fig. 8
The region of light path system is determined as the preferable region of image quality.
As shown in figure 9, Fig. 9 is the light spot illumination figure of the software simulation after system optimization change, Fig. 9 reflects imaging optical path
Overfill (spill-over) state of system, the light spot illumination figure rectangular frame-shaped in Fig. 9, the rectangle frame is more regular, illustrates
Image quality consistency on DMD is preferable.Further, as shown in Figure 10, Figure 10 is the imaging optical path after system optimization change
The uniformity schematic diagram of system, Fig. 9 indicate that the intensity of illumination distribution on DMD light valve face, curve V indicate perpendicular in the cross hairs of Fig. 9
The illumination floating situation of line, curve H indicate the illumination floating situation of the horizontal line in the cross hairs in Fig. 9, as seen from Figure 10,
The fluctuation of curve V and curve H are smaller, the energy uniformity of the imaging optical path system after illustrating corresponding system optimization change compared with
It is good.
In practical application, the being adapted to property of system parameter in leading portion subsystem and back segment subsystem is modified, to meet
The needs of imaging optical path system imaging Mass adjust- ment are illustrated in the embodiment of the present invention in terms of following two:
In a first aspect, as shown in Fig. 2, the imaging optical path system, may include 4 spheric glasses, respectively C1, C2, C3
And C4, direction of 4 spheric glasses from close to light-emitting surface to far from light-emitting surface (in Fig. 2 from left to right) are successively arranged, eyeglass
Focal length be respectively 58.084mm, 37.798mm, 91.398mm, 86.046mm, the mirror spacing of C1 to C2 is 9mm, C2 to C3
Mirror spacing is 65mm, the mirror spacing of C3 to C4 is 2mm.The focal length f1 of leading portion subsystem is 22.1mm, the focal length of back segment subsystem
F2 is 44.19mm, and leading portion subsystem and back segment subsystem meet: f1*tan (b1)=f2*tan (b2), wherein b1 is imaging
The incident light angle (incident light angle that is to say leading portion subsystem) of road system, b2 are the outgoing optic angle of the imaging optical path system
It spends (emergent light angle that is to say back segment subsystem).
Correspondingly, cooperation DMD's enters light mode, TIR prism 021 is as shown in figure 5, its angle a1 and a2 can be respectively
51.63 ° and 30 °, in practical application, 32.64 ° of angle a2 <.At this point, in the imaging optical path system, other systems parameter
Can be as shown in table 1, wherein there are two spherical surfaces for each eyeglass, by taking eyeglass C1 as an example, the radius of two spherical surface is respectively-
16.26mm and -15.48mm, the spacing with a thickness of 11mm, eyeglass C1 and eyeglass C2 of eyeglass C1 are 9mm, half mouthful of two spherical surfaces
Diameter is 11.5mm.
By taking eyeglass C4 as an example, the radius of two spherical surface is respectively 43.09mm and 109.42mm, eyeglass C4 with a thickness of
The spacing of 9.84mm, eyeglass C4 and prism is 9.5mm, and half bore of two spherical surfaces is 20.1mm.
Table 1
Second aspect, as shown in figure 4, the imaging optical path system, may include 3 eyeglasses, respectively C5, C6 and C7, this 3
Direction of the piece eyeglass from close to light-emitting surface to far from light-emitting surface (in Fig. 2 from left to right) is successively arranged, and respectively 21, spherical surface
Aspherical, the focal length of eyeglass is respectively 41.61mm, 52.04mm and 48.35mm, and the mirror spacing of C5 to C6 is 5mm, C6 to C7's
Mirror spacing is 65.09mm.
Correspondingly, cooperation DMD's enters light mode, TIR prism 021 is as shown in figure 5, its angle a1 and a2 can be respectively
51.63 ° and 30 °.
At this point, other systems parameter can be as shown in table 2 in the imaging optical path system, wherein there are two for each eyeglass
Spherical surface, by taking eyeglass C7 as an example, the radius of two mirror surface is respectively 47.16mm and -49.2mm, eyeglass C7 with a thickness of 15mm,
The spacing of eyeglass C7 and prism is 20mm, and half mouthful of two spherical surfaces is 21.5mm, and aspherical coefficient is -7.
Table 2
It should be noted that imaging optical path system provided in an embodiment of the present invention, the illumination path of light valve is two-part, preceding
What is transmitted between cross-talk system and back segment subsystem is collimated light beam, and two subsystems are relatively independent, can be according to front and back subsystem
Respective demand separately designs its internal structure, and two subsystems are smaller by being influenced between each other, in practical application
In, the system parameter in each subsystem, such as the number of eyeglass, the face type of eyeglass, spacing of eyeglass etc. can be according to specific feelings
Condition is adjusted, for example, leading portion subsystem includes 2 spherical mirrors, back segment subsystem includes 2 spherical mirrors；Alternatively, leading portion subsystem packet
2 spherical mirrors are included, back segment subsystem includes 1 aspherical mirror.As long as guaranteeing to transmit between leading portion subsystem and back segment subsystem
Be collimated light beam, so that it may according to actual conditions come adjust imaging light path system in system parameter, to increase the imaging
The tolerance and adjustable of light path system, and then can be adjusted separately for each unbalanced situation of visual field image quality, it reaches
The effect promoted to whole image quality.
And by the way that the illumination path of light valve is separately designed two subsystems, light beam is homogenized not changing light source output,
Under the premise of light valve receives parallel entrance beam, it can be easy to implement best match, it is (such as each for the tolerance of imaging optical path system
Kind machining eyeglass, assembling accumulated tolerance) it is convenient for realizing the elimination of error by the debugging respectively of two-part system architecture, it can also
To adjust the whole fault tolerance of imaging light path system by being increased and decreased number of lenses in every section, to improve the imaging
Light path system tolerance, generally, the imaging optical path system structure it is succinct.And leading portion subsystem and back segment subsystem
Optical power range (inverse of focal length) can determine, no limitation according to system requirements, wherein focal power is characterization optical system
The ability of deviation light.
And in practical applications, the requirement due to light valve to angular is entered, what is be emitted from homogenizer has certain hair
The light beam for dissipating angle needs to get to DMD by the transmission (such as turnover etc.) in space, as shown in fig. 6, the imaging optical path system
System can also include: spacing reflection mirror 23, and the spacing reflection mirror 23 is between leading portion subsystem 21 and back segment subsystem 22；It is empty
Between reflecting mirror 23 for will light gathering reflector to back segment subsystem 22, turn the optical path of leading portion subsystem 21 and back segment subsystem 22
Folding.Since spacing reflection mirror can be realized the optical path turnover of leading portion subsystem and back segment subsystem, imaging optical path system can simplify
System structure, and reduce occupied space.
In a specific implementation, above-mentioned preset refers to that the primary optical axis of the second collimated light beam and light valve enter light table into angular
The incident angle in face, the incident angle range are 34 degree.The incident angle range is the 2 of the light-entering surface angle rotatable of light valve
Times.Therefore, in the embodiment of the present invention, the rotation angle (also referred to as maximum rotation angle) of the light-entering surface of light valve can be 17 degree,
Positive 17 degree or minus 17 degree of rotation occur for the light-entering surface of as light valve.The system for being 12 ° relative to DMD corner rotates angle
There is bigger incident angle range for 17 ° of DMD, so as to realize smaller F#, thus also to the design of lighting system
It puts forward higher requirements.The present invention proposes the design of two-part system architecture, transmits between leading portion subsystem and back segment subsystem
It is collimated light beam, its internal structure can be separately designed according to front and back subsystem requirements, and what two subsystems were subject between each other
Influence is smaller, reduces the design difficulty of the imaging optical path system, while imaging optical path system being made to have biggish fault tolerance again.
Further, since in the embodiment of the present invention, the rotation angle of the light-entering surface of light valve is 17 degree, 12 degree can be compatible with, therefore,
Also the DMD's that support corner is 12 degree enters light requirement.
It is required to meet the incident of above-mentioned DMD light valve, as shown in fig. 7, in preset coordinate system, with light in leading portion subsystem
The system 21 or direction of beam Propagation is Z axis from homogenizer 11, in the plane of vertical Z axis, and two be respectively perpendicular
A axis is X-axis and Y-axis.
Spacing reflection mirror 23 includes the first reflecting mirror M1 and the second reflecting mirror M2, the first reflecting mirror M1 and the angle of X-axis is
45 degree, the angle of the second reflecting mirror M2 and Y-axis is 25~60 degree.
Alternatively, spacing reflection mirror includes third reflecting mirror (not shown), third reflecting mirror with 45 degree of X-axis angle.
It only schematically illustrates it should be noted that the rotation angle of the light-entering surface of above-mentioned light valve is 17 degree, actually answers
Imaging optical path system in, in the embodiment of the present invention, it is intended to make emergent light meet different DMD incidence requirements, so that entirely
Imaging optical path system has adjustability and compatibility, therefore, all within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
In conclusion imaging optical path system provided in an embodiment of the present invention, light source provides uniform illuminating bundle, illumination light
Road receives homogenized illuminating bundle, and illumination path uses telecentric system framework, designs for two-part system architecture, leading portion subsystem
What is transmitted between system and back segment subsystem is collimated light beam, therefore, can be separately designed inside it according to front and back cross-talk system requirements
Structure, such as number of lenses, face type, parameter etc., two subsystems are smaller by being influenced between each other, improve the imaging
Road system margins, adjustable, and then when each view field imaging quality of imaging light path system appearance is unbalanced, pass through difference
The system parameter for adjusting two systems, can achieve and reduce view field imaging quality difference, and balanced view field imaging quality is final to improve
The purpose of imaging system quality.
And imaging optical path system provided in an embodiment of the present invention, only by adjusting the two subsystems of illumination path, energy
Enough tolerances (such as various machining eyeglass, assembling accumulated tolerance) to imaging optical path system pass through the tune respectively of two-part system architecture
Examination is transferred light beam by spacing reflection mirror to realize the elimination of error, is changed light beam and is entered back segment subsystem
Transmission of angle and direction, it is easy to accomplish DMD light valve requires the incidence of light beam, while having compressed ray machine lighting system optical path body
Product.
Generally, the imaging optical path system structure is succinct, and tolerance and adjustable are strong, can be realized imaging image quality
Equilibrium, and the promotion of whole image quality.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of imaging optical path system, which is characterized in that the imaging optical path system includes:
Light source, for providing illuminating bundle；
Projection lens,
Illumination path, illuminating bundle for providing the light source are incident to light valve light-entering surface according to predetermined angle, light valve,
The predetermined angle light beam issued for receiving the illumination path, and the light beam is reflected according to image display control signal and is entered
Projection lens imaging；
Wherein, the illumination path includes leading portion subsystem and back segment subsystem, and the leading portion subsystem includes m piece eyeglass, institute
Stating back segment subsystem includes n piece eyeglass, wherein,,
The leading portion subsystem is used to receive illuminating bundle that the light source provides with the first parallel light emergence, and by described first
Collimated light beam converges in the object space focal plane of the back segment subsystem, and the light beam after the back segment subsystem is used to assemble converts
For the second collimated light beam, and second collimated light beam is incident to light valve light-entering surface according to predetermined angle；
Wherein, the back segment subsystem further include: TIR prism, the TIR prism are also used to flat by described second
After row light beam is incident to the light valve light-entering surface, the third collimated light beam of light valve light-entering surface reflection is received, and by institute
It states third collimated light beam and reflexes to the projection lens；
Wherein, the imaging optical path system divides visual field, the different imagings for dividing visual field with different image quality regions
Quality is adjusted equilibrium by the eyeglass to the leading portion subsystem and/or back segment subsystem.
2. imaging optical path system according to claim 1, which is characterized in that further include: homogenizer, the homogenizer
Between the light source and the leading portion subsystem, the illuminating bundle for issuing the light source is incident to described after homogenizing
Leading portion subsystem；
The length direction of the homogenizer is parallel to the length direction of the light valve square surface.
3. imaging optical path system according to claim 1, which is characterized in that
M=2, the leading portion subsystem include 2 eyeglasses, and 2 eyeglasses are spherical mirror.
4. imaging optical path system according to claim 1 or 3, which is characterized in that
N=2, the back segment subsystem include 2 eyeglasses, and 2 eyeglasses are aspherical mirror or 2 eyeglasses
It is spherical mirror, alternatively,
N=1, the back segment subsystem include 1 eyeglass, and 1 eyeglass is aspherical mirror.
5. imaging optical path system according to claim 1, which is characterized in that
The n piece eyeglass handles to obtain the second collimated light beam for the light beam that the leading portion subsystem issues to be carried out convergence, and
By on second parallel beam incident to the TIR prism, by the TIR prism by second parallel beam incident to institute
State light valve light-entering surface.
6. imaging optical path system according to claim 5, which is characterized in that the TIR prism is by two triangular prism microscope groups
At.
7. imaging optical path system according to claim 1, which is characterized in that further include spacing reflection mirror, the space is anti-
Mirror is penetrated between the leading portion subsystem and the back segment subsystem, for the leading portion subsystem and the rear cross-talk of transferring
Optical path between system.
8. imaging optical path system according to claim 7, which is characterized in that in preset coordinate system, with light described
The direction transmitted in leading portion subsystem is Z axis, in the plane of the vertical Z axis, and two axis being respectively perpendicular be X-axis and
Y-axis；
The spacing reflection mirror includes the first reflecting mirror and the second reflecting mirror, and first reflecting mirror and the angle of the X-axis are
45 degree, second reflecting mirror and the angle of the Y-axis are 25 ~ 60 degree；
Alternatively, the spacing reflection mirror includes third reflecting mirror, third reflecting mirror with 45 degree of X-axis angle.
9. imaging optical path system according to claim 1, which is characterized in that removed and the n piece eyeglass on the TIR prism
Adjacent surface, with the light valve light-entering surface adjacent surface and it is adjacent with the projection lens except 3 outer surfaces on be coated with
Delustring paint；And/or the TIR prism is provided with light barrier, the gear for being emitted on the light-emitting surface of the third collimated light beam
Through-hole is provided on mating plate, the through-hole is equal with the facula area that the third collimated light beam is formed.
10. imaging optical path system according to claim 1, which is characterized in that the predetermined angle are as follows: described second is parallel
Incident angle of the primary optical axis of light beam relative to the light valve light-entering surface, the incident angle range are 34 degree.
11. imaging optical path system according to claim 1, which is characterized in that the light source includes at least one color
Laser light source.
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| CN111176062A (en) * | 2020-02-24 | 2020-05-19 | Tcl科技集团股份有限公司 | Light field conversion device and laser display equipment |
| CN113495418A (en) * | 2020-04-07 | 2021-10-12 | 深圳光峰科技股份有限公司 | Optical-mechanical system and projection equipment applying same |
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| US6646806B1 (en) * | 2002-05-17 | 2003-11-11 | Infocus Corporation | Polarized light source system with dual optical paths |
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| CN1842149A (en) * | 2005-08-01 | 2006-10-04 | 斯曼特技术有限公司 | Optical structure for projection system |
| TW200844631A (en) * | 2007-03-09 | 2008-11-16 | Mitsubishi Electric Corp | Illumination device and image-projecting device |
| CN102591018A (en) * | 2012-01-20 | 2012-07-18 | 中国科学院上海技术物理研究所 | DMD-based field lens optical framework of infrared scene simulator |
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