CN109870791A - Short focus image projection device - Google Patents
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Abstract
The present invention relates to a kind of short focus image projection devices, in particular to one kind is widely portable to DLP, the ultrashort burnt optical projection apparatus of the display technologies such as LCD, the projection arrangement has projection distance short, projection is than big, total length is short, it is small in size, the features such as portable, it include mainly the front lens group being arranged successively from image source side to enlarging projection side, diaphragm and rear lens group and off axis reflector projection system, the image light that image source issues is by being incident to plane mirror after coaxial front lens group and rear lens group, the image light for being incident to thereon is reflexed to curved reflector by the reflecting surface of the plane mirror, the reflecting surface of the curved reflector is opposite with the reflecting surface of the plane mirror, it is projected so that image light thereon will be reflexed to scheduled amplification transmission direction to form projected image.Graphic projection's device according to the present invention can realize that overall volume is small, light weight, and color difference is small, imaging clearly, and image deformation is small, and optical texture is simple and compact, realizes the high-visible experience effect of projected image.
Description
Technical field
The present invention relates to a kind of image projection device, in particular to all kinds of image sources that are suitable for of a kind of Miniaturizable are shown
The projection arrangement of technology.
Background technique
In recent years, optical projection and daily life contact increasingly closely, are widely used in office teaching, video display
The fields such as projection, interaction entertainment, Automobile lamp ornament.Every profession and trade also steps up the performance requirement of optical projection, is mainly reflected in
It is higher to key indexes such as Projection Display brightness, contrast, resolution ratio, and under smaller volume, more short focus realize big ruler
The pursuit of very little drop shadow effect.In general, optical projection is core image-forming block by miniscope and optical projection lens.It is miniature
Display is used to complete the display of image visual digital information, and projecting lens realizes the figure that miniscope is shown or generated
As amplifying and projecting to predetermined position, on projection screen.Currently, occupation rate of market is highest to be suitable for the miniature aobvious of projection
Show technology for digital light processing (Digtal Light Procession, DLP), LCD technology (Liquid Crystal
Display, LCD) and reflective type silicon-based liquid crystal (Liquid Crystal on Silicon, LCoS), and constantly rise into
The Mini-LED of step, Micro-LED, the micro display device of the high pixel densities such as OLED (PPI).Wherein, DLP display technology benefit
Optical digital computing process is realized with digital micromirror elements (Digital Micromirror Device, DMD), can use sharp
Light has higher contrast, the advantage of resolution ratio and uniformity as light source；LCD and LCoS technology is because of its extensive manufacturer
With more application ranges, and have apparent cost advantage；Although Mini-LED technology etc. is not yet mature, it is being compared
Degree, brightness, service life, easily controllable go up have tempting technical prospect.
In order to form the image of high-resolution, low distortion on projection screen, projecting lens must cause the small chromatic difference of magnification, simultaneously
It is required that aperture ratio is big, wide-angle, imaging performance are good.In addition, should also have long back focal length and short projector distance, to reach knot
The purpose of structure compact and portable.
The projection optical system of most of optical projectors uses telecentricity zoom lens, and still, most of projection zooms are saturating
Mirror is four groups or five set vari-focus lens with 1.2 times of zoom ratios, and four groups of standard or five groups of telecentricity zoom lens are increasing coke
When away to increased magnification, in first group of lens of the zoom lens front end of screen side and zoom in object point side
The 4th group of lens rear or the 5th group of lens be it is fixed, first and the 4th between lens group or first and the 5th thoroughly
Lens group between microscope group is mobile.Conventional four groups or five groups of telecentricity zoom lens (such as institute is public in JP2000-206409A
Open) a large amount of lens of needs with obtain higher aberration reduce and wider field angle.Therefore, conventional projection zoom is saturating
Mirror needs a large amount of lens aberration (such as coma and distortion) is reduced to desired level, so conventional projection zoom is saturating
Mirror construction is complicated, higher cost.
Some fixed-focus optical projection systems including multiple lens can also meet the requirement to form low distortion, HD image.But
It is that multiple lens can improve the internal absorbance to short wavelength's light wave, therefore the transmission of optical projection system is smaller.Although can lead to
Combination is crossed to optical projection system of short wavelength's light wave internal absorbance lower lead glass lens composition with qualification aperture, but this
Kind optical projection system is also costly.
In the past, there is throwing that is all constituting using glass lens or all being constituted with plastic lens to reduce cost
Shadow lens etc., but with regard to reducing for cost, as the lens for meeting above-mentioned condition, by glass lens and have aspherical
The hybrid lens that plastic lens composition gets up become Main Trends of The Development.
Summary of the invention
Present invention aims to overcome that field angle is small in the image projection device that there is now, volume and quality be unable to satisfy it is small
The portable deficiency of type, and provide a kind of short projector distance, big projection than, brightness is high, color difference is small, clarity is high, light weight, body
The small and simple and compact optical texture image projection device of product.
A kind of short focus image projection device provided by the invention is thrown for amplifying the image of image source to predetermined direction
It penetrates, including the front lens group, diaphragm and the rear lens group that are arranged successively from image source side to enlarging projection side and off axis reflector
Projection system, the image light that image source issues pass through incident into off-axis anti-after coaxial front lens group, diaphragm and rear lens group
Penetrate projection system, the off axis reflector projection system includes a plane mirror and a curved reflector staggered relatively with plane mirror,
The plane mirror has the transparent surface portion that the reflective surface portion that area is S1 and area are S2, and the reflective surface portion will enter
It is incident upon the curved reflector that image light thereon reflexes to opposite side, the reflecting surface of the curved reflector will reflex to thereon
Image light is further amplified to scheduled direction and penetrates the transparent surface portion projection, is formed and is projected in predetermined projected area
Image；The combined focal length of the forward and backward lens group is f1, the focal length of curved reflector is f2, the total focal length of projection arrangement is f,
f1、f2Meet formula (1) with f.
Preferably, the first lens of front lens group are the positive lens that front surface is convex surface, the focal length f of the first lens3With total coke
Meet formula (2) away from f.
3≤f3The formula of/f≤13 (2)
A kind of example according to the present invention, front lens group include at least four lens, front lens group focal length f4With total focal length f
Meet formula (3)；
4≤f4The formula of/f≤30 (3)
The rear lens group includes at least four lens, rear lens group focal length f5Meet formula (4) with total focal length f.
3≤f5The formula of/f≤25 (4)
Specifically, off axis reflector projection system can fold optical path using two secondary reflections, off axis reflector projection system is with before
The angle of rear lens group optical axis is adjustable, the angle of plane mirror normal in front and back lens group optical axis and off axis reflector projection system
Degree changes within the scope of 30-60 degree.
Plane mirror in off axis reflector projection system only has reflecting mirror entity in reflective surface portion, and transparent surface portion does not have
Standby entity, and can be non-coplanar with reflective surface portion；
Curved reflector according to the present invention can be selected from quadratic surface, aspherical or free form surface face type；When it
For free form surface reflecting surface when, preferably XY free form surface surface is described by equation described below:
Wherein c is surface curvature, and k is the constant of the cone, and Ci is multinomial coefficient.
Above-mentioned curved reflector can select the mode of metal medium processing polished plated film.
Preferably, making front lens group total length (distance in micro-display face to diaphragm face) is L1, rear lens group length (light
Distance of the late face to the last one surface of rear lens group) it is L2, meet 0.9≤L1/L2≤2.7.
The nearest lens surface of distance map image source is away from distance of the face along optical axis for issuing image in illustrative front lens group
It include a pair of in 4 lens of front lens group particularly to meet the requirement of prefix type illumination image source more than or equal to 8mm
Balsaming lens includes a cemented doublet in 4 lens of rear lens group.
Front lens group and rear lens group only include spherical lens, alternatively, front lens group and/or rear lens group include aspheric
Face lens.
Short focus image projection device according to the present invention is used in projection lamp, specifically, further including being placed in image source
The radiator of non-light emission side, also, forward and backward lens group is made with optical glass and is also beneficial to improve heat resistance.
Image projection device according to the present invention can according to need sweeping using the high brightness for being attached to light fixture
Projecting image source, or the image source with spontaneous light ability are retouched, image Source size is effectively controlled, and light is by rear
After microscope group outgoing, into off axis reflector projection system, it is incident on plane mirror and reflexes to free-form surface mirror again, have
Effect shortens the occupied volume of whole projection optics under same projector distance, enters pupil of human convenient for improving entirety
Digital picture brightness, enhancing with real scene imaging contrast；The utilization of curved reflector can exist to the full extent
It keeps expanding projected area in the case where image quality, and optical texture is simply fixed easily, it is whole in shorter projector distance
Light-weight, the short distance that can be widely applied to various limited small size space installations projects under scene on a large scale.
Detailed description of the invention
Fig. 1 is the light channel structure figure of the off-axis refraction-reflection type image projection device YOZ plane of first embodiment of the invention；
Fig. 2 is the light channel structure figure of the off-axis refraction-reflection type image projection device XOZ plane of first embodiment of the invention；
Fig. 3 is the short distance projecting light path of the off-axis refraction-reflection type image projection device YOZ plane of first embodiment of the invention
Structure chart；
Fig. 4 is the short distance projecting light path of the off-axis refraction-reflection type image projection device XOZ plane of first embodiment of the invention
Structure chart；
Fig. 5 is the optical path MTF curve figure for the off-axis refraction-reflection type image projection device that first embodiment of the invention provides；
Fig. 6 is the light path imaging effect point range for the off-axis refraction-reflection type image projection device that first embodiment of the invention provides
Figure；
Fig. 7 is the light path imaging effect distortion net for the off-axis refraction-reflection type image projection device that first embodiment of the invention provides
Trrellis diagram；
Fig. 8 is optical path when a kind of coaxial front and back microscope group of first embodiment of the invention has deflection angle relative to the position Fig. 1
Structure chart, (a) are coaxial front and back microscope group with respect to 30 ° of off axis reflector projection system deflection；(b) for coaxial front and back microscope group it is opposite from
Axis reflects projection system and deflects 40 °；(c) 50 ° are deflected with respect to off axis reflector projection system for coaxial front and back microscope group, (d) is coaxial
Front and back microscope group deflects 60 ° with respect to off axis reflector projection system；
When Fig. 9 is the deflection angle according to Fig.8, of first embodiment of the invention, corresponding projected area and projecting direction
Change schematic diagram；
Figure 10 is the light channel structure of the YOZ plane for the off-axis refraction-reflection type image projection device that second embodiment of the invention provides
Figure；
Figure 11 is the short distance projecting light path of the off-axis refraction-reflection type image projection device YOZ plane of second embodiment of the invention
Structure chart；
Figure 12 is the short distance projecting light path of the off-axis refraction-reflection type image projection device XOZ plane of second embodiment of the invention
Structure chart
Figure 13 is the light path imaging effect point range for the off-axis refraction-reflection type image projection device that second embodiment of the invention provides
Figure
Figure 14 is the light path imaging effect distortion for the off-axis refraction-reflection type image projection device that second embodiment of the invention provides
Grid chart；
Figure 15 is the light channel structure figure of the off-axis refraction-reflection type image projection device YOZ plane of third embodiment of the invention；
Figure 16 is the short distance projecting light path of the off-axis refraction-reflection type image projection device YOZ plane of third embodiment of the invention
Structure chart；
Figure 17 is the short distance projecting light path of the off-axis refraction-reflection type image projection device XOZ plane of third embodiment of the invention
Structure chart.
Each appended drawing reference indicates: 101: preposition illuminated image source；102: prism；103: lens；104: lens；105: double
Balsaming lens；106: lens；107: diaphragm；108: lens；109: lens；110: lens；111: lens；112 lens；113:
Plane mirror；114: curved reflector；115: being projected to image planes
201: back side illumination image source；202: lens；203: non-spherical lens；204: cemented doublet；205: lens；206:
Diaphragm；207: lens；208: lens；209: cemented doublet；210: non-spherical lens；211: plane mirror；212: camber reflection
Mirror；213: being projected to image planes.
301: ROM mask programmable read-only memory image source；302: lens；303: non-spherical lens；304: cemented doublet；305: lens；306:
Diaphragm；307: lens；308: lens；309: cemented doublet；310: non-spherical lens；311: plane mirror；312: camber reflection
Mirror；313: being projected to image planes.
Specific embodiment
Actual example of the invention, those skilled in the art will be embodied to be discussed in detail with reference to attached drawing etc. in the following contents
It is to be appreciated that specific name, term used in following each descriptions etc. does not constitute the restriction to technical solution of the present invention, and
In the following description, for ease of description, identical component will use identical appended drawing reference.
The statement instruction of workable such as "comprising", " comprising ", " may include " or " may include " in the disclosure
There are disclosed corresponding function, operation and constituent element etc., and do not limit other one or more functions, operation or group
At element etc..In addition, in the disclosure, it should be understood that term "comprising", " comprising ", " having " etc. are for indicating exist
Feature, quantity disclosed in specification, step, operation, constituent element, components or groups thereof, and do not exclude to exist or mend in advance
A possibility that filling other one or more features, quantity, step, operation, constituent element, components or groups thereof.
In the disclosure, statement " first " and " second " etc. can modify a variety of constituent element of the disclosure, but unlimited
Make corresponding constituent element.For example, statement does not limit sequence or importance of corresponding constituent element etc..Statement can be used for
One constituent element is distinguished with another constituent element.For example, first user device and all use of second user device
Family device, and represent different user apparatus.For example, the first constituent element can be named as the second constituent element without de-
From spirit and scope of the present disclosure.In the same manner, the first constituent element can also be named as even if the second constituent element.
Short focus image projection device according to the present invention, illustratively include from image source side to enlarging projection side successively
Front lens group, diaphragm, rear lens group and the off axis reflector projection system of arrangement, by plane in off axis reflector projection system
Mirror and curved reflector use two secondary reflections to fold optical path to reach predetermined projection than lower to requirement small in size, front lens group
Effect with rear lens group is the image information light beam that image source is presented amplification, focuses and is projected to plane mirror.In general,
The forward and backward coaxial setting of lens group has scheduled combined focal length f1, the relatively above-mentioned optical axis located off-axis of curved reflector has
Focal length f2, the total focal length of projection arrangement is f, f1、f2Meet with f:
First embodiment:
According to being as shown in figures 1-4 the first embodiment of the present invention, wherein Fig. 1,2 is shown in first embodiment of the invention
For short focus image projection device respectively in the light channel structure figure of YOZ plane and XOZ plane, Fig. 3,4 are first embodiment of the invention institute
Show short focus image projection device respectively in the short distance projecting light path structure chart of YOZ plane and XOZ plane, wherein Fig. 3 it is left,
Schematical projection distance is 23cm on Fig. 4, and projected area area keeps rectangle, reaches 42.5 cun, showing under the right side Fig. 3, Fig. 4
Meaning property projection distance is 46cm, and projected area area is opened up to 85 cun, and projection is than being 2.45.According to the image projection of the present embodiment
Device, specifically, as shown in Figure 1, including miniature display image source, preferably using reflection type display elements such as DLP, LCoS
To reach higher brightness, LCD type or self luminous OLED type display element also selected from high brightness are not pursuing dynamic
It is also applicable with the image source that the illuminated light source such as static mask image, subgraph is illuminated and realized under the scene of image projection
, it include lens 103,104,106 in the front lens group of image source, cemented doublet 105, diaphragm 107 is later for successively
Each simple lens 108~112 in the rear lens group of arrangement, 113 He of plane mirror for optical path of turning back in off axis reflector projection system
Reflection light to predetermined projected area curved reflector 114.The optical axis of the relatively coaxial forward and backward lens group of plane mirror 113 turns
Certain angle is rolled over, for example, typical off axis reflector projection system and the optical axis of forward and backward lens group are in about 45 jiaos.It is understood that
, off axis reflector projection system as a whole, on the effective reflecting surface region of curved reflector 113 and plane mirror 113
Area is the reflective surface portion face of S1, i.e. the normal direction of curved reflector 114 should be with the reflective surface portion of plane mirror 113
In substantially 45 aberrations that introduce off axis to avoid system of degree angles, light is by the reflective surface portion of plane mirror 113 to camber reflection
Mirror 114 can further increase view to the image light Jing Guo forward and backward lens group due to the curvature effects of curved-surface reflection side
, so that human eye is clear that the image that amplification is projected out on predetermined projected area.
First embodiment according to the present invention, before and after the satisfaction under the relationship of microscope group, curved reflector focal length and total focal length,
Usually make the positive lens on 103 front surface convex surface of the first lens of front lens group, focal length f3With the total focal length f of device into
One step meets: 3≤f3/ f≤13 promote the receipts light efficiency to image source.For using the image source component of prefix type illumination,
Such as TI company possesses the DLP of patented technology, constitutes array of photoswitch digital micro-mirror DMD using the direction of control reflected light
Scanning projection goes out digital image information, has higher contrast, resolution ratio and uniformity, but entering the lens with curvature
Before, need to add prism 102 so that for illuminating, the addition of prism 102 requires the surface distance in face of image source of lens 103
The light-emitting surface of image source, such as the front surface of digital micro-mirror DMD should meet more than or equal to 8mm, so that DLP type microdrawing image source
It can be used, may be equally applicable for the present embodiment similar to the LCoS type image source of mode.As table 1 show each lens measure
The data in face.With the surface sequence of each optical element of image source side to projected area side successively marked as 1,2 ..., 25,
Wherein adjacent cemented surface face type having the same, is denoted as same surface.
Table 1
Wherein 114 face type of curved reflector is aspherical, and face type data are as shown in table 2:
Table 2
In order to reach lesser volume, while guaranteeing that the brightness of image quality and imaging reaches the requirement of normal use, diaphragm 107
It is placed between the microscope group of front and back, reduces the bore of front and back lens group overall, while off axis reflector projection system to a certain extent
The scheme that plane mirror and two secondary reflection of curved reflector are used in system, ensure that biggish projection while reducing system length
Than, image quality is not reflected off-axis influence by the way of plane mirror synergic reflex, it ensure that good image quality,
Final system total length can be no more than 7cm, project ratio 0.245, meet the requirement of full HD projection.Fig. 5,6 respectively illustrate
The MTF curve figure and each field image point diagram, Fig. 7 for stating the exemplary light line structure of first embodiment are system imaging distortion grid
Figure, image deformation are less than or equal to 4%, meet the imaging requirements of macrostructure system.
For the curved reflector in first embodiment, optical material is preferably used, it can also be by non-optical material vehicle
It cuts polishing to form, and plates reflectivity close to 100% metal quality reflectance coating, to reduce in effective reflecting surface region
Transmittance guarantees the brightness of image in projected area, reduces power consumption, and when human eye is observed by diffusing reflection, visual comfort is high.
As a kind of mode of variation, above-mentioned off axis reflector projection system can also have relative to front and back microscope group to be different from
The relative positional relationship of Fig. 1, such as shown in Figure 8,9, specifically, the angle of the normal of plane mirror and the optical axis of forward and backward lens group
Degree adjusts in the range of the degree angle about 30-60, and the flexibility in projected area and direction, and system imaging quality can be enhanced
It is unaffected, it in the concrete realization, may be implemented by the front and rear mirror group system for rotating coaxial, coaxial front and back microscope group is whole
Rotation keeps adjustment more convenient, can be adapted for the scene of different directions projection, also has the configuration design of single unit system higher
Freedom degree.
Second embodiment:
Figure 10 shows the light channel structure figure of the image projection device of second embodiment of the invention, and Figure 11,12 are the present invention
Short focus image projection device shown in second embodiment respectively in the short distance projecting light path structure of YOZ plane and XOZ plane
Figure, wherein Figure 11 is left, schematical projection distance is 23cm on Figure 12, and the size of projected area is 45 cun, Figure 11 is right,
Schematical projection distance is 46cm under Figure 12, and the size of projected area is 85 cun, and projection is than being 2.16.Different from
The lens of forward and backward lens group are made of spherical lens in one embodiment, in second embodiment of the invention in forward and backward lens group
Lens contain aspherical, aspherical use and can be further improved picture quality.
According to a second embodiment of the present invention, illustrative backlight or self-luminous display member using without preposition illumination
Part, it is similar with first embodiment such as the LCD image source of backlight, the image light in described image source by image source 201 front surface
After sending, amplify again after the forward and backward lens group inner focusing in optical path, is projected to plane mirror 211, and by plane mirror 211
Reflective surface is finally projected to predetermined projected area by curved reflector 212, so that human eye be made to exist to curved reflector 212
It can be clearly seen that the image of display on the continuing surface of projection.
It is front lens group containing non-spherical lens in a kind of illustrative light channel structure, rear lens group, plane mirror 211, bent
The structural parameters of face reflecting mirror 212 are as shown in table 3, with the surface of each optical element of image source side to projected area side
Successively marked as 1,2 ..., 22, wherein adjacent cemented surface face type having the same, is denoted as same surface.
Table 3
Wherein lens 203,210 and 212 face type of curved reflector are aspherical, and face type data are as shown in table 4
Table 4
Since the embodiment uses the LCD of backlight mode, in simple lens 202 close to one side surface of image source and LCD image
There is no the optical element such as illumination, colour wheel is conducive between the light-emitting surface 201 in source, hence for second embodiment of the invention
Image projection device, distance between the two can reduce, so that the projection arrangement entire length after Stowage Plane image source contracts
It is short.It is higher generally as source position temperature since brightness needed for projecting is higher, close to the first optical element of image source side (lens
Or prism) material cannot be optical resin.Those skilled in the art understand that, for being capable of self luminous OLED type microdrawing
Image source, Micro-LED type microdrawing image source, is equally applicable to the image projection device of the present embodiment.
Further, the entity of plane mirror is also preferable only including the part of reflective surface area S1, can with curved reflector
With the machine-shaping of one, the part of transmission area S2 can not have entity, as shown in Figure 10.At this point, for guaranteeing to scheme
Such as the sealing of optical element and optical path can be realized by the substantially cylindrical lens barrel of lens 210 required for image quality amount, subtracted
Light sealing difficulty.
According to the exemplary light line structure of above-mentioned second embodiment, optical texture overall length further reduce to be no more than 6cm,
It projects and respectively illustrates showing for above-mentioned second embodiment than maintaining the level similar with first embodiment for 0.216, Figure 13,14
Each field image point diagram and distortion grid figure of example property light channel structure, have good image quality characteristics.
3rd embodiment:
Figure 15 shows the light channel structure figure of the image projection device of third embodiment of the invention, and it is real to be different from first and second
It applies schematical projected area in example and substantially obtains, third embodiment of the invention parallel relative to coaxial front and back lens group optical axis
Middle projected area is embodied as with the direction of above-mentioned optical axis at an angle, while the off-axis aberration come for compensation image planes tilting band,
Image source is placed with respect to the inclined light shaft of front and back lens group, and camber reflection mirror surface type selects free form surface.
In the third embodiment, it is preferred to use the static patterned mask cooperation with light transmittance and/or hue distinguishes
Collimating mirror outgoing backlighted (not shown) realizes image source, generates static digital images, and the image light in described image source is passed through
Amplify again after forward and backward lens group inner focusing in optical path, be projected to plane mirror 311, and it is anti-by reflecting mirror 311 to reflex to curved surface
Mirror 312 is penetrated, is launched after finally being reflected by curved reflector 312, such as to screen 313, so that human eye be made to can be clearly seen that display
Image.Since the angle tilt of projected area causes distal end projection magnifying power very big, and proximal end projection magnifying power is relatively
Small, the area of projected area is trapezoidal, and Figure 16,17 show the projection arrangement of 3rd embodiment respectively in YOZ plane and XOZ
The short distance projecting light path structure chart of plane, although trapezoidal projected area mode carrys out the image aberration correction belt of display
Adverse effect, but for the patterned mask by design, predeformation can be set at image masks end, to throw
The anti-pattern solved under big projected area afterwards is penetrated, can be used for suggestive predetermined pattern illumination, show that trade mark brand, commodity are wide
Accuse etc..
Front lens group containing non-spherical lens, rear lens group, plane mirror in a kind of illustrative light channel structure
311, the structural parameters of curved reflector 312 are as shown in table 5, with each optical element in image source side to projected area side
Surface is successively marked as 1,2 ..., and 22, wherein adjacent cemented surface face type having the same, is denoted as same surface.
Table 5
Wherein lens 303,310 face types are aspherical, and face type data are as shown in table 6
Table 6
A kind of preferred curved mirror surfaces face type is XY free form surface surface, is described by equation described below:
Wherein c is surface curvature, and k is the constant of the cone, and Ci is multinomial coefficient, in 3rd embodiment, free form surface
The face type data of reflecting mirror can be as shown in table 7:
Table 7
In the third embodiment of the present invention, the optical axis of the opposite front and back lens group of projected area is directed toward about 15 ° of deflection, from
And when projecting length 300cm in standoff height 23cm, projection ratio reaches 0.077.If saturating using high-capacity LED and collimation
Mirror realization illuminates still image exposure mask to generate image source, and each lens in third embodiment of the invention are preferred
Be made completely using glass material, to effectively reduce raised influence of the variation to each lens of temperature, and curved reflector with
It is the preferred embodiment for improving heatproof that metal material with high reflectivity, which is directly processed and generated also, further, in image source
It is also optional that light source back, which is provided with radiator,.
Above-mentioned example embodiment according to the present invention, it will be appreciated by those skilled in the art that, realize that the present invention is each
Projection ratio under example simultaneously keeps smaller device effective length to be not particularly limited as above-mentioned each face offset, but front and back lens group,
The focal length of curved reflector meetsTo the picture quality for keeping image projection apparatus of the invention to project
Play a significant role.In the first to three embodiment of the invention, the combined focal length f of forward and backward lens group1, the coke of curved reflector
Away from f2, the total focal length of projection arrangement is f, f1、f2It is respectively as follows: with the relationship of f
| First embodiment | Second embodiment | 3rd embodiment | |
| f1/f | 4.8 | 4.95 | 5.27 |
| f2/f | 3.5 | 4.23 | 3.5 |
| f1/f2 | 1.37 | 1.17 | 1.49 |
Further, make front lens group focal length f4Meet f with total focal length f4/ f >=4 are conducive to the axial distance of front lens group
It effectively shortens, likewise, rear lens group focal length f5Meet f with total focal length f5Similar effect also may be implemented in/f >=3, to control
Projection arrangement front lens group total length L 1 (distance from image surface to diaphragm face) and rear lens group under the system present invention is total
Length L2 (distance of the last one lens surface from diaphragm face to rear lens group), in illustrative each embodiment, L1 and L2
Meet 0.9≤L1/L2≤2.7.Of the invention first obtains high quality projection image and equally meets into 3rd embodiment
Above-mentioned several points.
| First embodiment | Second embodiment | 3rd embodiment | |
| f4/f | 14.7 | 12 | 9.2 |
| f5/f | 4.6 | 4.4 | 4.4 |
| L1/L2 | 1.17 | 1.1 | 0.93 |
The present invention can be embodied in many different forms and should not be construed as limited by each embodiment set forth herein.And
Being to provide these embodiments, to make the disclosure sufficiently and complete, and comprehensively conveys this hair to those skilled in the art
Bright design.In addition, the feature in each embodiment can also combine in the way of except above-described embodiment, after combination
Technical solution is still fallen within the scope of the present application.
Claims (10)
1. a kind of short focus image projection device, for by the image of image source to predetermined direction enlarging projection, comprising:
Front lens group, diaphragm and rear lens group and the off axis reflector projection being arranged successively from image source side to enlarging projection side
System, the image light that image source issues are thrown by the off axis reflector that enters incident after coaxial front lens group, diaphragm and rear lens group
Penetrate system, the off axis reflector projection system includes a plane mirror and a curved reflector staggered relatively with plane mirror, described
Plane mirror has the transparent surface portion that the reflective surface portion that area is S1 and area are S2, and the reflective surface portion will be incident to it
On image light reflex to the curved reflector of opposite side, the reflecting surface of the curved reflector will reflex to image light thereon to
Scheduled direction is further amplified and penetrates the transparent surface portion projection, forms projected image in predetermined projected area；
The combined focal length of the forward and backward lens group is f1, the focal length of curved reflector is f2, the total focal length of projection arrangement is f, f1、
f2Meet formula (1) with f.
2. short focus image projection device as described in claim 1, which is characterized in that first lens of front lens group are preceding table
Face is the positive lens on convex surface, the focal length f of the first lens3Meet formula (2) with total focal length f.
3≤f3The formula of/f≤13 (2)
3. image projection device as claimed in claim 1 or 2, which is characterized in that the front lens group includes at least four thoroughly
Mirror, front lens group focal length f4Meet formula (3) with total focal length f；
4≤f4The formula of/f≤30 (3)
The rear lens group includes at least four lens, rear lens group focal length f5Meet formula (4) with total focal length f.
3≤f5The formula of/f≤25 (4)
4. image projection device as described in claim 1, it is characterised in that the off axis reflector projection system use is anti-twice
Penetrate folding optical path, off axis reflector projection system and the angle of front and back lens group optical axis are adjustable, front and back lens group optical axis with from
The angle of plane mirror normal changes within the scope of 30-60 degree in axis reflection projection system.
5. such as claim 1 or 4 described image projection arrangements, it is characterised in that the plane mirror in the off axis reflector projection system
Only there is reflecting mirror entity in reflective surface portion, transparent surface portion does not have entity, and can be non-coplanar with reflective surface portion.
6. image projection device as described in claim 1, which is characterized in that the curved reflector is selected from quadratic surface, non-
The face type of spherical surface or free form surface.
7. image projection device as claimed in claim 6, which is characterized in that the curved reflector can select metal medium
The mode of processing polished plated film.
8. image projection device as claimed in claim 1, which is characterized in that the front lens group total length is (micro- aobvious
Show device face to diaphragm face distance) for L1, rear lens group length (distance of the diaphragm face to the last one surface of rear lens group) is
L2,
0.9≤L1/L2≤2.7。
9. image projection device as claimed in claim 2, the nearest lens surface of distance map image source is away from hair in the front lens group
The face of image is more than or equal to 8mm along the distance of optical axis out.
10. using the projection lamp of claim 1-9 any image projection arrangement, it is characterised in that further include being placed in image source
The radiator of non-light emission side.
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| CN112433426A (en) * | 2019-08-26 | 2021-03-02 | 宁波舜宇车载光学技术有限公司 | Projection system and method of manufacturing the same |
| US20210232037A1 (en) * | 2020-01-23 | 2021-07-29 | Seiko Epson Corporation | Projection system and projector |
| CN113180029A (en) * | 2021-05-24 | 2021-07-30 | 中国人民解放军93114部队 | Multifunctional laser scanning bird repelling system and method |
| CN115128815A (en) * | 2022-08-29 | 2022-09-30 | 泽景(西安)汽车电子有限责任公司 | Image display method and device, electronic equipment and storage medium |
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| JP2016009037A (en) * | 2014-06-23 | 2016-01-18 | 株式会社リコー | Projection device and projection system |
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| JP2002122785A (en) * | 2000-10-17 | 2002-04-26 | Minolta Co Ltd | Oblique projection optical system |
| JP6064535B2 (en) * | 2012-11-14 | 2017-01-25 | 株式会社リコー | Projection optical system and image display apparatus including the same |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112433426A (en) * | 2019-08-26 | 2021-03-02 | 宁波舜宇车载光学技术有限公司 | Projection system and method of manufacturing the same |
| CN112433426B (en) * | 2019-08-26 | 2022-07-19 | 宁波舜宇车载光学技术有限公司 | Projection system and method of manufacturing the same |
| US20210232037A1 (en) * | 2020-01-23 | 2021-07-29 | Seiko Epson Corporation | Projection system and projector |
| JP2021117277A (en) * | 2020-01-23 | 2021-08-10 | セイコーエプソン株式会社 | Projection optical system and projector |
| JP7380246B2 (en) | 2020-01-23 | 2023-11-15 | セイコーエプソン株式会社 | Projection optical system and projector |
| US11892764B2 (en) * | 2020-01-23 | 2024-02-06 | Seiko Epson Corporation | Projection system and projector |
| CN113180029A (en) * | 2021-05-24 | 2021-07-30 | 中国人民解放军93114部队 | Multifunctional laser scanning bird repelling system and method |
| CN115128815A (en) * | 2022-08-29 | 2022-09-30 | 泽景(西安)汽车电子有限责任公司 | Image display method and device, electronic equipment and storage medium |
| CN115128815B (en) * | 2022-08-29 | 2022-12-20 | 泽景(西安)汽车电子有限责任公司 | Image display method and device, electronic equipment and storage medium |
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