CN106164770A - Light source and projector - Google Patents
Light source and projector Download PDFInfo
- Publication number
- CN106164770A CN106164770A CN201480077709.XA CN201480077709A CN106164770A CN 106164770 A CN106164770 A CN 106164770A CN 201480077709 A CN201480077709 A CN 201480077709A CN 106164770 A CN106164770 A CN 106164770A
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- Prior art keywords
- light
- light source
- lens
- dichroic mirror
- collecting lens
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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
- G03B21/2073—Polarisers in the lamp house
-
- 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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
A kind of light source (1), has: light source (1a)；Dichroic mirror (1h), this dichroic mirror (1h) is reflected in from the S-polarization light in the light of light source (1a)；Collecting lens group (1i, 1k), the light that this collecting lens group (1i, 1k) optically focused reflects from dichroic mirror (1h)；Phosphor elements (1l), this phosphor elements (1l) can move so that the light from collecting lens group (1i, 1k) sequentially shines on phosphor area and reflector space；With 1/4 wavelength plate (1j), this 1/4 wavelength plate (1j) is arranged between the lens of collecting lens group (1i, 1k).
Description
Technical field
The present invention relates to a kind of light source including fluorophor and a kind of projector using this light source.
Background technology
Patent document 1 describe that the light source using fluorophor as the projector of light source.Fig. 1 illustrated light source equipment
Structure.
With reference to Fig. 1, excitation source 116 includes multiple blue laser diode (LD).Blueness from excitation source 116 output
Exciting light is collimated lens arra 106 and is converted into collimated light beam, and subsequently enters dichroic mirror 115.Excitation source 116 is by cloth
It is set to enter dichroic mirror 115 so that light energy output is enough as S-polarization light.Dichroic mirror 115 is arranged such that blue excitation
The angle of incidence of light can be 45 °.Noting, angle of incidence is formed between incident ray and the normal set at incidence point
Angle.
Fig. 2 illustrates the spectral-transmission characteristics of dichroic mirror 115.Vertical axes represents absorbance, and trunnion axis represents wavelength
(nm).Solid line represents the spectral-transmission characteristics about S-polarization light, and dotted line represents the spectral-transmission characteristics about P polarization light.
The cutoff wavelength of S-polarization light is 456nm, and the cutoff wavelength of P polarization light is 434nm.Noting, cutoff wavelength is to have 50%
The wavelength of absorbance.
Dichroic mirror 115 has the light for S-polarization light more than transmission 456nm and reflects the spy of the light less than 456nm
Property, and there is the light for P polarization light more than transmission 434nm and reflect the characteristic of the light less than 434nmnm.Such as, blue
The wavelength of color exciting light is 445nm.Blue excitation light (S-polarization light) from excitation source 116 is reflected by dichroic mirror 115.
The blue excitation light (S-polarization light) reflected by dichroic mirror 115 is by 1/4 wavelength plate 108 thus is converted into circle
Polarized light.Converged to glimmering by the blue excitation light (circularly polarized light) of 1/4 wavelength plate 108 by two collecting lens 109a and 109b
On body of light layer 103.
Luminescent coating 103 is formed thereon on the substrate being formed with dichroic coating (dichroic coating).Substrate
Be divided into first to Part III in circumferential direction, and luminescent coating 103 include being formed in the first portion red
Color phosphor area and formation green fluorescence body region in the second portion.Part III is applied in reflectance coating.By rotation
Transglutaminase substrate makes blue excitation light (circularly polarized light) sequentially irradiate the first to Part III.
In the first portion, by blue excitation light activated fluorophor outgoing red fluorescence.In the second portion, blue
The fluorophor outgoing green fluorescence of excitation.In Part III, blue excitation light (circularly polarized light) is at reflectance coating table
Reflected on face.
Red fluorescence from Part I, the green fluorescence from Part II and the reflectance coating table at Part III
On face, the blue light (circularly polarized light) of reflection passes sequentially through collecting lens 109a and 109b and 1/4 wavelength plate 108.Here,
Blue light (circularly polarized light) from Part III is converted into P polarization light after by 1/4 wavelength plate 108.Red fluorescence, green
Color fluorescence and blue light (P polarization light) are transmitted through dichroic mirror 115 respectively.
Although not shown in Fig. 1, but it is transmitted through the red fluorescence of dichroic mirror 115, green fluorescence and blue light
(P polarization light) is converged on an end surfaces of bar integrator by collecting lens.In bar integrator, enter from an end surfaces
The light of row incidence propagates through bar thus leaves from another surface.The use of bar integrator makes it possible to obtain is hanging down with optical axis
The output light of uniform light intensity distributions on straight surface.
Generally, when LD is for excitation source, use 1/4 wavelength plate being made up of high fast light crystal.But, although its
Light for the angle of incidence for having less than 5 ° provides the phase contrast of pi/2 (=1/4 λ), but 1/4 wavelength crystal slab has angle
Dependency, wherein for having the light of the angle of incidence more than 5 °, polarized light is maintained.This needs 1/4 wavelength crystal slab to be arranged in
In the light path of collimated light beam.
In the light source illustrated in FIG, similarly, owing to LD is for excitation source 116, so 1/4 wavelength plate 108
Generally it is made up of crystal.1/4 wavelength plate 108 is disposed between collecting lens 109a and dichroic mirror 115.But, due to
Blue excitation between collecting lens 109a and dichroic mirror 115 just collimated light beam, described in there is no the angle of 1/4 wavelength plate 108
Spend dependent impact.
Reference listing
Patent documentation
Patent documentation 1:JP2012-108486A
Summary of the invention
But, the light source described in patent documentation 1 has the following problems.
Between the collecting lens of luminescent coating 103 and bar integrator side, from the fluorescence of luminescent coating 103 as dissipating
Beam propagation.In this case, owing to the distance away from luminescent coating 103 is longer, so the beam diameter of fluorescence is bigger.Accordingly
Ground, when the distance from luminescent coating 103 to the collecting lens of bar integrator side increases, the size of collecting lens must increase,
Thus result in the size of optical system and the increase of cost.
Additionally, when the distance from luminescent coating 103 to the collecting lens of bar integrator side increases, at collecting lens and bar
Distance between integrator increases, and the most more expands optical system.
Because previous reasons, it is desirable to from luminescent coating 103 to the collecting lens of bar integrator side distance as far as possible
Little.
But, in the light source described in patent documentation 1, because 1/4 wavelength plate 108 is disposed in collecting lens
Between 109 and dichroic mirror 115, so the distance between collecting lens 109 and dichroic mirror 115 increases, and result, from
Luminescent coating 103 increases to the distance of the collecting lens of bar integrator side.Therefore, size and the cost of generating optics system increases
Problem.
It is an object of the invention to provide and be capable of the miniaturization of optical system and the light source of low cost and use this
The projector of light source.
In order to realize purpose, according to aspects of the present invention, it is provided that light source, including: light source, this light source outgoing excites
Light；Dichroic mirror, this dichroic mirror is configured to reflect or transmission is from the First Line polarized light of the light of light source；First optically focused is saturating
Mirror group, this first collecting lens group includes multiple lens and is configured to assemble the reflection light from dichroic mirror or transmission
Light；Phosphor elements, this phosphor elements includes the phosphor area being provided with fluorophor and wherein reflects the anti-of incident illumination
Penetrate region, and this phosphor elements is moveable so that the light from the first collecting lens group can sequentially be irradiated to
Phosphor area and reflector space；With 1/4 wavelength plate, adjacent saturating of be arranged in multiple lens two of this 1/4 wavelength plate
Between mirror.Each first collecting lens group and phosphor elements be arranged such that the fluorescence from phosphor area outgoing and from
The reflection light of reflector space enters dichroic mirror via the first collecting lens group and 1/4 wavelength plate.
According to a further aspect in the invention, it is provided that projector, including said light source equipment；Display element, this display element
Modulate spatially from the light of light source output to form image；And projection optics system, this projection optics system amplify and
The image that projection is formed by display element.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the structure of the light source described in diagram patent documentation 1.
Fig. 2 is the performance plot of the spectral-transmission characteristics of the dichroic mirror of the light source of diagram in pictorial image 1.
Fig. 3 is the schematic diagram of the structure of the light source illustrating the first exemplary embodiment according to the present invention.
Fig. 4 is the schematic diagram of the example illustrating the fluorophor wheel used in the light source illustrated in figure 3.
Fig. 5 is the schematic diagram of the example illustrating the color wheel used in the light source illustrated in figure 3.
Fig. 6 is between position and the incident area illustrating 1/4 wavelength plate in the light source illustrated in figure 3
The schematic diagram of relation.
Fig. 7 is the figure of the light angle distribution illustrating each position illustrated in figure 6.
Fig. 8 is the schematic diagram of the light path illustrating blue light and fluorescence in the light source illustrated in figure 3.
Fig. 9 is that diagram includes the schematic diagram of the example of the projector of the light source of diagram in Fig. 3.
Figure 10 is the example that diagram includes the projector of the light source of the 3rd exemplary embodiment according to the present invention
Schematic diagram.
Reference
1a light source
1b collimating lens
1c to 1e, 1i, 1k, 1m lens
1f polarization separating element
1g diffusing panel
1h dichroic mirror
1j 1/4 wavelength plate
1l phosphor elements
1n color filter unit
Detailed description of the invention
The exemplary embodiment of the present invention is described next, with reference to accompanying drawing.
(the first exemplary embodiment)
Fig. 3 illustrates the structure of the light source of the first exemplary embodiment according to the present invention.
With reference to Fig. 3, light source 1 includes that light source 1a, collimating lens 1b, lens 1c to 1e, 1i, 1k and 1m, polarized light divide
From element 1f, diffusing panel 1g, dichroic mirror 1h, 1/4 wavelength plate 1j, phosphor elements 1l and color filter unit 1n.
Light source 1a includes blue laser diode (LD, laser diode), and this blue laser diode has for output
The blue light of the peak wavelength in blue wavelength region.Such as, light source 1a includes the blue LD being arranged in the matrix of 6 × 4.
But, the unlimited number of blue LD is in 24.Can increase/reduce the number of blue LD with the need.
Collimating lens 1b is that each blue LD is arranged, and will be converted into collimated light beam from the blue light of blue LD output.
Lens 1c to 1e will carry out each blue light (incident beam) conversion of incidence from light source 1a via collimating lens 1b
Become the collimated light beam that wherein beam diameter reduces.By the diameter of output beam being set smaller than the diameter of incident beam, energy
Enough sizes reducing the component arranged after lens 1c to 1e.Here, three lens 1c to 1e are used.But, the number of lens
Mesh is not limited to 3.The number of lens can be increased or decreased with the need.
Dichroic mirror 1h is entered via polarization separating element 1f from the blue light of lens 1c to 1e outgoing.Diffusing panel 1g quilt
It is arranged in the light path between polarization separating element 1f and dichroic mirror 1h.Diffusing panel 1g diffusion is from polarization separating element
The blue light of 1f.Such as, scattering angle is 3 °.Here, scattering angle is formed in the light (central ray) at the center by light beam
And by the angle between the outermost light of light beam.
Polarization separating element 1f has separation S-polarization light and the characteristic of P polarization light, here, polarization separating element 1f
There is reflection S-polarization light and the characteristic of transmitting P-type polarisation light.Light source 1a is arranged such that its output light (blue light) can be made
Resolution element 1f is entered for S-polarization light.Polarization plates or dichroic mirror can be used in polarization separating element 1f.
The blue light (S-polarization light) reflected by polarization separating element 1f enters dichroic mirror 1h.Dichroic mirror 1h about
As S-polarization light carry out the light of incidence have characteristics that its medium wavelength equal or longer than the light transmission of first wave length and its
Medium wavelength is shorter than the light of first wave length and is reflected, and described first wave length is longer than the wavelength (wavelength of blue light) of light source 1a.Additionally,
About the light carrying out incidence as P polarization light, dichroic mirror 1h has characteristics that its medium wavelength is equal or longer than second wave length
Light transmission and its medium wavelength be shorter than the light of second wave length and reflected, the wavelength that described second wave length is shorter than light source 1a is (blue
The wavelength of light).The dichroic mirror 1h with this characteristic can be realized by multilayer dielectric film.
Blue light (S-polarization light) from polarization separating element 1f is guided to phosphor elements 1l by dichroic mirror 1h.
1/4 wavelength plate 1j and lens 1i and 1k is disposed in the light path between dichroic mirror 1h and phosphor elements 1l.
Phosphor elements 1l includes fluorophor wheel and for rotating the driver element (motor) of fluorophor wheel.Take turns at fluorophor
In, phosphor area and reflector space are sequentially disposed in circumferential direction, in phosphor area, arrange the light that is excited and swash
Send out thus the fluorophor of outgoing fluorescence.
Fig. 4 illustrates the example of fluorophor wheel.With reference to Fig. 4, fluorophor wheel has yellow fluorescence body region 10Y, green fluorescence
Body region 10G and reflector space 10B.Formed yellow fluorescence body region 10Y, green fluorescence body region 10G and reflector space 10B with
Arrangement (array) the most in circumferential direction.
Reflector space 10B reflection is from the blue light of light source 1a.Yellow fluorescence body region 10Y include being excited light excite from
And the fluorophor of outgoing yellow fluorescence.The green fluorescence body region 10G light that includes being excited excites thus outgoing green fluorescence glimmering
Body of light.Yellow fluorophor and green-emitting phosphor both can be excited by the blue light from light source 1a.Note, yellow fluorescence bag
Include wave-length coverage from green to red light.
According to be included in from light source 1 output light in sodium yellow, red light, green light and blue light in every
The balance of individual light intensity, suitably sets in yellow fluorescence body region 10Y, green fluorescence body region 10G and reflector space 10B
Each area ratio (ration of division in circumferential direction) in circumferential direction.
1/4 wavelength plate 1j is made up of high fast light inorganic material.Such as, 1/4 wavelength plate 1j has by inorganic material (dielectric
Material) the birefringent multilayer film made.Birefringent multilayer film is configured to the phase contrast of pi/2 (=1/4 λ) is supplied to incident illumination
Polarization surface.Such as, have by tilting the double of column structure from what incline direction deposited particles was formed on the surface of the substrate
Refracting layer is known as having birefringence for the light the most vertically carrying out incidence.At this birefringent layers
In, it is possible to provide arbitrary phase contrast by regulation film thickness to the polarization surface of incident illumination.In this embodiment, similarly,
The birefringent multilayer film that 1/4 wavelength plate 1j is applied by this inclination column structure is formed.The angle of 1/4 wavelength inorganic board 1j depends on
Rely the property dependence of angle less than 1/4 wavelength crystal slab.Such as, 1/4 wavelength inorganic board 1j can provide for having less than 40 °
The phase contrast of light of angle of incidence.Additionally, 1/4 wavelength inorganic board 1j can be formed as being thinner than 1/4 wavelength crystal slab, and example
As, using the teaching of the invention it is possible to provide there is 1/4 wavelength inorganic board 1j of the thickness of 0.3mm.
1/4 wavelength plate 1j is disposed between lens 1i and 1k.Lens 1i and 1k composition is used for will be from dichroic mirror 1h
Blue light be focused at phosphor elements 1l fluorophor wheel on collecting lens group.According to embodiment, two lens 1i and 1k
Constitute collecting lens group.But, this structure limits by no means.Three or more lens may be constructed this collecting lens group.
In this kind of situation, between the given lens that 1/4 wavelength plate 1j is disposed in collecting lens group.But, this situation is necessary
Meet following condition: between the lens arranging 1/4 wavelength plate 1j, blue light is set to the angle of incidence of 1/4 wavelength plate 1j
The angle of any impact of the dependence of angle of 1/4 wavelength plate 1j is not provided.In order to meet this condition, 1/4 wavelength plate 1j is permissible
It is disposed in multiple lens, closest to the first lens of location, dichroic mirror 1h side and second saturating adjacent to the first lens
Between mirror.
Blue light (S-polarization light) from dichroic mirror 1h by 1/4 wavelength plate 1j thus is converted into circularly polarized light.Logical
The blue light (circularly polarized light) crossing 1/4 wavelength plate 1j is irradiated on fluorophor wheel via lens 1k.
When rotating fluorophor wheel, the blue light (circularly polarized light) from lens 1k is sequentially irradiated to yellow fluorophor district
Territory 10Y, green fluorescence body region 10G and reflector space 10B.In yellow fluorescence body region 10Y, by blue light activated yellow
Fluorophor outgoing yellow fluorescence.In green fluorescence body region 10G, glimmering by blue light activated green-emitting phosphor outgoing green
Light.In reflector space 10B, the blue light from lens 1k is reflected towards lens 1k.
From the yellow fluorescence (non-polarized light) of yellow fluorescence body region 10Y, green from green fluorescence body region 10G
Fluorescence (non-polarized light) and the blue light (circularly polarized light) from reflector space 10B pass sequentially through lens 1k, 1/4 wavelength respectively
Plate 1j and lens 1i is hence into dichroic mirror 1h.Here, the blue light (circularly polarized light) from reflector space 10B passes through 1/4
Wavelength plate 1j thus be converted into P polarization light.This blue light (P polarization light) enters dichroic mirror 1h.
Logical from yellow fluorescence (non-polarized light), green fluorescence (non-polarized light) and the blue light (P polarization light) of lens 1i
Cross dichroic mirror 1h.It is focused at not shown by yellow fluorescence, green fluorescence and the blue light of dichroic mirror 1h by lens 1m
Optical element one end surface on (such as light uniformization element such as optical channel or bar integrator).
Color filter unit 1n includes color wheel.This color wheel is arranged to compared with the focal position of lens 1m more connect
Nearly lens 1m side.
The example of Fig. 5 graphical color wheel.With reference to Fig. 5, color wheel has yellow transmission filters 11Y, red transmission filters
Device 11R, green transmissive filter 11G and diffusing panel 11B.Form yellow transmission filters 11Y, red transmission filter 11R, green
Color transmission filters 11G and diffusing panel 11B is to arrange in circumferential direction.
The region of yellow transmission filters 11Y and the region of red transmission filter 11R are taken turns with the fluorophor of diagram in Fig. 4
Yellow fluorescence body region 10Y corresponding, and green transmissive filter 11G and diffusing panel 11B respectively with the fluorescence of diagram in Fig. 4
Green fluorescence body region 10G of body wheel is corresponding with reflector space 10B.Yellow transmission filters 11Y, red transmission filter 11R,
Green transmissive filter 11G and diffusing panel 11B area ratio in circumferential direction are the most right with what the fluorophor of diagram in Fig. 4 was taken turns
The area ratio in the region answered is similar to.
According to be included in from light source 1 output light in sodium yellow, red light, green light and blue light in every
The balance of individual light intensity, suitably sets yellow transmission filters 11Y and red transmission filter 11R in circumferential direction
Area ratio.
Color filter unit 1n and phosphor elements 1l are configured to rotation synchronized with each other.From yellow fluorescence body region
The yellow fluorescence of 110Y includes the light of yellow component and the light of red color components, the light of yellow component be transmitted through yellow transmitted through
Filter 11Y, and the light of red color components is transmitted through red transmission filter 11R.
Green fluorescence from green fluorescence body region 10G is transmitted through green transmissive filter 11G.From reflector space
The blue light of 10B passes through diffusing panel 11B.The diffused light of blue light is from diffusing panel 11B outgoing.Such as, the scattering angle of about 10 ° can
The most suitably change.
It is defeated from light source 1 by sodium yellow, red light, green light and the blue light of color filter unit 1n
Go out light.
According to the light source of embodiment, by arranging have less than 1/4 wavelength crystal slab between lens 1i and 1k
1/4 wavelength inorganic board 1j of the dependence of angle of dependence of angle, it is possible to realize miniaturization and the low cost of optical system.Under
Wen Zhong, will be described in detail its reason.
Fig. 6 is the schematic diagram of the relation between position and the incident area being shown in 1/4 wavelength plate.When 1/4 wavelength
Time at the position P1 of the dichroic mirror 1h side that plate 1j is disposed in lens 1i, the region of the 1/4 wavelength plate lj that blue light passes through
A size of 32mm2.Time at the position P2 of the lens 1k side that 1/4 wavelength plate 1j is disposed in lens 1i, blue light pass through 1/4
The size in the region of wavelength plate lj is 25mm2.When 1/4 wavelength plate 1j is disposed at the position P3 of fluorophor wheel side of lens 1k
Time, the size in the region of the 1/4 wavelength plate lj that blue light passes through is 20mm2.Therefore, the ripple that the blue light at the P3 of position passes through
The size in the region of long slab is minimum, and the size in the region of wavelength plate that the blue light the P2 of position at passes through is secondary little.
The light angle distribution of each position of diagram in Fig. 7 pictorial image 6.Vertical axes represents strength ratio (%), and
Trunnion axis represents light angle (spending).The solid line connecting black diamonds mark represents at the P1 of position ray angles in the X direction
Degree distribution.The solid line connecting black square mark represents that the P1 of position at light angle in the Y direction is distributed.Connect black three
The solid line of cornet mark represents at the P2 of position light angle distribution in the X direction.The solid line connecting X mark represents at position P2
Place's light angle distribution in the Y direction.The solid line connecting * mark represents that at the P3 of position light angle in the X direction is divided
Cloth.The solid line connecting circle marker represents that the P3 of position at light angle in the Y direction is distributed.
The light angle of the blue light at the P1 of position is ± 5 °.The light angle of the blue light at the P2 of position is ±
28°.The light angle of the blue light at the P3 of position is ± 65 °.Owing to 1/4 wavelength inorganic board 1j is for the incidence of less than 40 °
The light at angle is able to maintain that characteristic, even if so when it is disposed at the P2 of position, there is not the angle of 1/4 wavelength inorganic board 1j
Dependent impact.But, when 1/4 wavelength plate 1j is disposed at the P3 of position, there is the impact of dependence of angle.
Compared with being disposed in the structure at the P1 of position with 1/4 wavelength plate 1j, it is disposed in position P2 according to 1/4 wavelength plate 1j
Place structure, blue light by region from 32mm2It is reduced to 25mm2, and therefore, it is possible to reduce the size of 1/4 wavelength plate 1j
Thus realize low cost.
Additionally, be disposed in the structure at the P2 of position according to 1/4 wavelength plate 1j, including the light of the system for assembling fluorescence
System can reduction of size and cost.Hereinafter, its reason will be specifically described.
Fig. 8 is schematically illustrated the light path of blue light and fluorescence.Dotted line represents the anti-of the blue light from reflector space 10B
Penetrate light path, and solid line represents from the yellow fluorescence of yellow fluorescence body region 10Y or green from green fluorescence body region 10G
The light path of color fluorescence.
Lens 1i and 1k is designed to be focused at the blue light from dichroic mirror 1h on the irradiation surface of fluorophor wheel,
Without the poly-fluorescence (complete diffused light) from yellow fluorescence body region 10Y or green fluorescence body region 10G.Therefore.Coming
The blue light of self-reflection region 10B is assembled by lens 1i and 1k thus is converted into collimated light beam L1 substantially, and is transmitted through
While dichroic mirror 1h, from fluorescence (complete diffused light) quilt of yellow fluorescence body region 10Y or green fluorescence body region 10G
Lens 1i and 1k assembles, but is transmitted through dichroic mirror 1h as diffusion light beam L2.In other words, from fluorophor wheel until lens
1m, the fluorescence from yellow fluorescence body region 10Y or green fluorescence body region 10G is propagated as diffusion light beam L2.In this situation
In, due to along with the distance taken turns away from fluorophor longer, the beam diameter of diffusion light beam L2 is bigger, so when take turns to from fluorophor
When the distance of mirror 1m increases, the size of lens 1m must increase, and thus results in the size of optical system and the increase of cost.
Additionally, when the distance taking turns to lens 1m from fluorophor increases, the distance between lens 1m and optical channel 2a is also
Increase, therefore expand optical system.
Because previous reasons, it is desirable to the distance taking turns to lens 1m from fluorophor is the shortest.
According to embodiment, by 1/4 wavelength inorganic board is arranged in position P2, it is possible to solve the chi of aforesaid optical system
The problem that very little and cost increases.
Specifically, lens 1i and 1k is planoconvex lens, and convex surface points to dichroic mirror 1h side.Dichroic mirror 1h quilt
It is arranged so that the angle formed by the optical axis of lens 1i and 1k can be less than 45 °.In this case, by with lens 1i's
Peripheral part is arranged close to be positioned at the end of the dichroic mirror 1h of lens 1i side, it is possible to shorten between dichroic mirror 1h and lens 1i
Distance.
Additionally, 1/4 wavelength plate 1j can adhere to lens 1i, or be directly formed in lens 1i and, owing to being not required to
It is used for keeping the keeper of 1/4 wavelength plate 1j, so the space between lens 1i and 1k increases the thickness with 1/4 wavelength plate 1j
Spend equal amount.1/4 wavelength inorganic board 1j can thinning be below 0.3mm, and therefore limits between lens 1i and 1k
The increase in space.
On the other hand, it is disposed in the structure of position P1 at 1/4 wavelength plate 1j, 1/4 wavelength plate 1j's and lens 1i
Convex surface must be arranged to buffer the most mutually, and the end of 1/4 wavelength plate 1j and dichroic mirror 1h must be arranged to
Buffer the most mutually.Keep additionally, due to 1/4 wavelength plate 1j must be kept part, so at dichroic mirror 1h and 1/4 wavelength plate lj
Between space and space between lens 1i and 1/4 wavelength plate 1j must be set, in order to prevent at 1/4 wavelength plate lj
Keeper and the keeper of lens 1i and dichroic mirror 1h between buffering.As a result, between lens 1i and dichroic mirror 1h
Space have to be larger than and be disposed in the space in the structure at the P2 of position at 1/4 wavelength plate 1j.
As described above, be disposed in the structure at the P2 of position according to 1/4 wavelength plate 1j, it is possible to reduce lens 1i and two to
Space between color mirror 1h, it is possible to reduce the space between lens 1i and dichroic mirror 1h, and therefore, it is possible to shorten from glimmering
Body of light takes turns to the distance of lens 1m, and optical system can size with become present aspect to reduce.
In addition to the effect above, following effect can also be provided according to the light source of embodiment.
By arranging dichroic mirror 1h, the wavelength region that wherein S-polarization light and P polarization light can separate broadens so that come
The incidence angle θ of the central ray of the blue light of self-reflection region 10B can be more than 45 °.Such as, dichroic mirror 1h is arranged to make
The incidence angle θ obtaining blue light can be 55 °.Therefore, individual diversity XOR temperature dependency the change of the LD emission wavelength caused
Impact be lowered.
But, the absorbance of dichroic mirror 1h reduces according to the increase of angle of incidence.Correspondingly, from reflector space 10B
The part of blue light (P polarization light) reflected by dichroic mirror 1h.When the blue light (P polarization light) reflected by dichroic mirror 1h
When returning to light source 1a, LD oscillating operation becomes unstable, and result, and the output of LD reduces.Especially, when there is echo area
During imaging relations between territory 10B and light source 1a (luminous point of LD), the blue light from reflector space 10B returns light source 1a's
Luminous point, the problem therefore making the output of LD reduce is more significantly.
According to embodiment, in order to eliminate the blue light returning to light source 1a side from dichroic mirror 1h, polarized light is separated unit
Part 1f is arranged in the light path between dichroic mirror 1h and light source 1a.The blue light (P polarization light) reflected by dichroic mirror 1h is saturating
Penetrate by polarization separating element 1f.It is transmitted through the blue light (P polarization light) of polarization separating element 1f with light source 1a's
Different side, direction travels upwardly, and does not return the luminous point of light source 1a.As a result, LD oscillating operation will not become unstable.
(projector)
Fig. 9 diagram includes the structure of the projector of the light source 1 of diagram in Fig. 3.
With reference to Fig. 9, projector includes light source 1, lamp optical system 2, projection optics system 3 and display element 4.
The output light of light source 1 is guided to display element 4 by lamp optical system 2, and by rectangle and uniform
Light supplies to display element 4.Lamp optical system 2 includes optical channel 2a, lens 2b, 2c and 2e and mirror 2d.
Optical channel 2a has rectangular shape, and the output light of light source 1 enters internal from one end, and incident light propagation
By inside thus leave from the other end.The surface (incidence surface) of one end of optical channel 2a is arranged the light illustrated in figure 3
At the focal position of the lens 1m of source device 1.Exist phosphor elements 1l fluorophor wheel irradiate surface and optical channel 2a
Imaging relations between incidence surface.
The light exported from the other end of optical channel 2a is irradiated to display element via lens 2b and 2c, mirror 2d and lens 2e
4.Lens 2b, 2c and 2e are collecting lenses
Display element 4 modulates the light beam from lamp optical system 2 spatially according to the video signal forming image.Example
As, display element 4 is digital micromirror device (DMD).DMD has multiple micro mirror, and each micro mirror is configured to according to driving voltage
Change angle, and angle of reflection is when when the driving voltage of supply instruction on-state and when the driving of supply instruction off-state
It is different between during voltage.By making each micro mirror stand on-off control according to video signal, incident beam is empty
Between modulate thus form image.Noting, in addition to DMD, liquid crystal panel etc. can also be used to display element 4.
The image formed by display element 4 is amplified and projects in projection surface by projection optics system 3.As long as can
Image is projected thereon, then can use any projection surface such as screen or wall.
(the second exemplary embodiment)
The light source of the second exemplary embodiment according to the present invention will be described.
Light source according to this embodiment constructs in the following manner: wherein in the reverse light source 1 illustrated in figure 3
S-polarization light and P polarization light between relation.Specifically, polarization separating element 1f, the diffusing panel illustrated in figure 3 is maintained
1g, dichroic mirror 1h, lens 1m and the layout of color filter unit 1n.Light source 1a, collimating lens 1b and lens 1c to 1e quilt
It is arranged as contrary with the diffusing panel 1g side of polarization separating element 1f.1/4 wavelength plate 1j, lens 1i and 1k and phosphor elements
1l is arranged to contrary with the polarization separating element 1f side of dichroic mirror 1h.
Polarization separating element 1f has reflection S-polarization light and the characteristic of transmitting P-type polarisation light.Light source 1a is arranged to make
Obtain its light energy output enough as P polarization light entrance polarization separating element 1f.
Blue light (P polarization light) from light source 1a enters polarized light via collimating lens 1b and lens 1c to 1e and separates unit
Part 1f.Blue light (polarized light) is transmitted through polarization separating element 1f thus enters dichroic mirror 1h via diffusing panel 1g.
Dichroic mirror 1h has following first characteristic about the light carrying out incidence as P polarization light: its medium wavelength equal to or
Being shorter than the light transmission of first wave length and its medium wavelength is longer than the light of first wave length and is reflected, described first wave length is longer than blue light
Wavelength.Additionally, dichroic mirror 1h has following second characteristic about the light carrying out incidence as S-polarization light: its medium wavelength etc.
In or be shorter than the light transmission of second wave length and its medium wavelength is longer than the light of second wave length and is reflected, described second wave length is shorter than indigo plant
The wavelength of coloured light.Here, first wave length is the cutoff wavelength in the first characteristic, and second wave length is the cut-off in the second characteristic
Wavelength.The dichroic mirror 1h with this characteristic can be realized by multilayer dielectric film.
Blue light (P polarization light) from polarization separating element 1f is transmitted through dichroic mirror 1h, with via lens 1i
With 1k and 1/4 wavelength plate 1j thus be irradiated to phosphor elements 1l.Blue light (P polarization light) by 1/4 wavelength plate 1j thus
It is converted into circularly polarized light.Blue light (circularly polarized light) is sequentially irradiated to yellow fluorescence body region 10Y, green fluorescence body region
10G and reflector space 10B.
In yellow fluorescence body region 10Y, by blue light activated yellow fluorophor outgoing yellow fluorescence.At green fluorescence
In body region 10G, by blue light activated green-emitting phosphor outgoing green fluorescence.In reflector space 10B, from lens 1k's
Blue light is reflected towards lens 1k.
From the yellow fluorescence (non-polarized light) of yellow fluorescence body region 10Y, green from green fluorescence body region 10G
Fluorescence (non-polarized light) and the blue light (circularly polarized light) from reflector space 10B pass sequentially through lens 1k, 1/4 wavelength respectively
Plate 1j and lens li is hence into dichroic mirror 1h.Here, the blue light (circularly polarized light) from reflector space 10B passes through 1/4
Wavelength plate 1i thus be converted into S-polarization light.This blue light (S-polarization light) enters dichroic mirror 1h.
By the yellow fluorescence (non-polarized light) of 1/4 wavelength plate 1j, green fluorescence (non-polarized light) and blue light (P polarization
Light) reflected by dichroic mirror 1h.The yellow fluorescence, green fluorescence and the blue light that are reflected by dichroic mirror 1h enter via lens 1m
The color wheel of color filter unit 1n.
According to embodiment, as in the case of the first exemplary embodiment, 1/4 wavelength plate 1j is made up of inorganic material, and
And be disposed between lens 1i and lens 1k.Therefore it provides the operation identical with the operating effect of the first exemplary embodiment
Effect.
In this embodiment, it is possible to apply the amendment described in the first exemplary embodiment.Additionally, the light source of embodiment sets
The standby projector that can be applied in Fig. 9 diagram.Specifically, in the projector illustrated in fig .9, light source 1 is real by this
The light source executing example is replaced.
(the 3rd exemplary embodiment)
Figure 10 diagram includes the structure of the projector of the light source of the 3rd exemplary embodiment according to the present invention.
Light source 10 is the light source according to this embodiment.In light source 10, polarization separating element 1f quilt
It is arranged so that the angle of incidence of the central ray of the blue light from light source 1a can be 45 °, and dichroic mirror 1h is arranged
The angle of incidence becoming the central ray making the blue light from reflector space 10B can be 45 °.Other structure is exemplary with first
The structure of the light source of embodiment is similar to.
1/4 wavelength plate described in 1/4 wavelength plate 1j and the first exemplary embodiment is similar to.In this embodiment, similar
Ground, 1/4 wavelength plate 1j is disposed between lens 1i and lens 1k.Correspondingly, using the teaching of the invention it is possible to provide with the first exemplary embodiment
The operating effect that operating effect is identical.
When three or more lens constitute collecting lens group, 1/4 wavelength plate 1j be disposed in collecting lens group to
Between fixed lens.But, this situation must is fulfilled for following condition, wherein between the lens that 1/4 wavelength plate 1j is arranged, blue
Coloured light is set to such angle to the angle of incidence of 1/4 wavelength plate 1j: the dependence of angle of 1/4 wavelength plate 1j does not has any shadow
Ring.
The projector illustrated in Fig. 10 includes: light source 10, lamp optical system 2, projection optics system 3 and display
Element 4.Projector described in lamp optical system 2, projection optics system 3 and display element 4 and the first exemplary embodiment
Lamp optical system 2, projection optics system 3 similar with display element 4.In this projector, by with the first exemplary reality
That executes the projector described in example operates identical operation amplification and projects images.
In the exemplary embodiment, analogously it is possible to application the first exemplary embodiment described in amendment.
(the 4th exemplary embodiment)
The light source of the 4th exemplary embodiment according to the present invention will be described.
Light source according to this embodiment constructs in the following manner, wherein the reverse light source 10 illustrated in Fig. 10
In S-polarization light and P polarization light between relation.Specifically, polarization separating element 1f, the diffusion illustrated in Fig. 10 is maintained
Plate 1g, dichroic mirror 1h, lens 1m and the layout of color filter unit 1n.Light source 1a, collimating lens 1b and lens 1c to 1e
It is arranged to contrary with the diffusing panel 1g side of polarization separating element 1f.1/4 wavelength plate 1j, lens 1i and 1k and phosphor elements
1l is arranged to contrary with the polarization separating element 1f side of dichroic mirror 1h.
The operation of the light source according to this embodiment is similar with the operation of the light source of the second exemplary embodiment.This
Outward, in including the projector of light source of this embodiment, by with the light source including the second exemplary embodiment
The identical operation amplification of operation of projector and projects images.
In this embodiment, analogously it is possible to application the first exemplary embodiment described in amendment.
Light source according to each embodiment described above and projector are only the examples of the present invention, and its structure
Can need with opportunity with operation and change.
Such as, in the first exemplary embodiment, it is convenient to omit color filter unit 1n, diffusing layer can be arranged on
In Fig. 4 on the reflector space 10B in the fluorophor wheel of phosphor elements 1l of diagram, and the portion of yellow fluorescence body region 10Y
Divide or all can be replaced by red fluorescence body region.This amendment also is able to be applied to the second to the 4th exemplary embodiment.
In the first exemplary embodiment, light source 1 can include the part or all of of lamp optical system 2.This repaiies
Change and also be able to be applied to the second to the 4th exemplary embodiment.
Additionally, in each example, 1/4 wavelength inorganic board can be by being made up at glass or quartz of vapour deposition process
Substrate on form inorganic birefringent multilayer film and prepare, or inorganic double by directly being formed in lens by vapour deposition process
Birefringent multilayer film and prepare.
The present invention can use the structure described in following complementary annotations, but, the invention is not restricted to these structures.
[complementary annotations 1]
A kind of light source, including:
Light source, described light source outgoing exciting light；
Dichroic mirror, described dichroic mirror be configured to reflect or transmission from the light of described light source First Line polarize
Light；
First collecting lens group, described first collecting lens group includes multiple lens and is configured to assemble from described
The reflection light of dichroic mirror or transmission light；
Phosphor elements, described phosphor elements includes the phosphor area being provided with fluorophor and wherein reflects incidence
The reflector space of light, and described phosphor elements is moveable so that and the light from described first collecting lens group can
Sequentially it is irradiated to described phosphor area and described reflector space；With
1/4 wavelength plate, between two adjacent lens that described 1/4 wavelength plate is arranged in the plurality of lens,
Wherein, each described first collecting lens group and described phosphor elements are arranged such that from described fluorophor district
The fluorescence of territory outgoing and the reflection light from described reflector space enter via described first collecting lens group and described 1/4 wavelength plate
Enter described dichroic mirror.
[complementary annotations 2]
According to the light source described in complementary annotations 1, wherein, described 1/4 wavelength plate is disposed in the plurality of lens
, between the first lens being arranged on described dichroic mirror side and the second lens adjacent with described first lens.
[complementary annotations 3]
According to the light source described in complementary annotations 1 or 2, wherein, described 1/4 wavelength plate includes inorganic birefringent multilamellar
Film, described inorganic birefringent multilayer film is configured to be supplied to the phase contrast of 1/4 λ the polarization surface of incident illumination, and λ represents described
The wavelength of light source.
[complementary annotations 4]
According to the light source described in any one in complementary annotations 1 to 3, farther include the second collecting lens group, institute
State the second collecting lens group and include assembling multiple lens of the output light from described light source,
Wherein, described first and second collecting lens groups are including described phosphor area and the surface of described reflector space
The light source image of the described light source of upper formation.
[complementary annotations 5]
According to the light source described in any one in complementary annotations 1 to 4, farther include collecting lens, described optically focused
Lens are configured such that the fluorescence from described phosphor area outgoing and the reflection light from described reflector space are via described
First collecting lens group, described 1/4 wavelength plate and described dichroic mirror enter described collecting lens, and described collecting lens optically focused enters
The light that row is incident.
[complementary annotations 6]
According to the light source described in complementary annotations 5, farther include color filter unit, described color filter list
Unit includes yellow transmission filters, red transmission filter, green transmissive filter and diffusion area, and described color filtering
Device unit is moveable so that the light from described collecting lens sequentially enters described yellow transmission filters, described red
Color transmission filters, described green transmissive filter and described diffusion area, wherein:
Yellow fluorescence body region that described phosphor area includes being provided with the fluorophor of outgoing yellow fluorescence and wherein
The green fluorescence body region of the fluorophor of outgoing green fluorescence is set；And
Yellow fluorescence from described yellow fluorescence body region sequentially enters described yellow transmission filters and described red
Color transmission filters, from the green fluorescence described green transmissive filter of entrance of described green fluorescence body region, and from
The blue light of described reflector space enters described diffusion area.
[complementary annotations 7]
A kind of projector, including:
According to the light source described in any one in complementary annotations 1 to 6；
Display element, described display element modulates the light exported from described light source spatially to form image；With
Projection optics system, the image that described projection optics system amplifies and projection is formed by described display element.
Claims (7)
1. a light source, including:
Light source, described light source outgoing exciting light；
Dichroic mirror, described dichroic mirror is configured to reflect or transmission is from the First Line polarized light of the light of described light source；
First collecting lens group, described first collecting lens group includes that multiple lens and described first collecting lens group are constructed
Become to assemble the reflection light from described dichroic mirror or transmission light；
Phosphor elements, described phosphor elements includes the phosphor area being provided with fluorophor and wherein reflects incident illumination
Reflector space, described phosphor elements is moveable so that from described first collecting lens group light can sequentially according to
It is mapped to described phosphor area and described reflector space；With
1/4 wavelength plate, between two adjacent lens that described 1/4 wavelength plate is arranged in the plurality of lens,
Wherein, each in described first collecting lens group and described phosphor elements is arranged such that from described fluorophor
The fluorescence of region outgoing and from the reflection light of described reflector space via described first collecting lens group and described 1/4 wavelength plate
Enter described dichroic mirror.
Light source the most according to claim 1, wherein, described 1/4 wavelength plate be disposed in the plurality of lens,
It is arranged in the first lens on described dichroic mirror side and between the second lens adjacent with described first lens.
Light source the most according to claim 1 and 2, wherein, described 1/4 wavelength plate includes inorganic birefringent multilayer film,
Described inorganic birefringent multilayer film is configured to be supplied to the phase contrast of 1/4 λ the polarization surface of incident illumination, and λ represents described light
The wavelength in source.
4., according to the light source described in any one in claims 1 to 3, farther include the second collecting lens group, described
Second collecting lens group includes the multiple lens assembling the output light from described light source,
Wherein, described first and second collecting lens groups shape on the surface including described phosphor area and described reflector space
Become the light source image of described light source.
5. according to the light source described in any one in Claims 1-4, farther including collecting lens, described optically focused is saturating
Mirror is configured such that the fluorescence from described phosphor area outgoing and the reflection light from described reflector space are via described
One collecting lens group, described 1/4 wavelength plate and described dichroic mirror enter described collecting lens, and described collecting lens optically focused is carried out
Incident light.
Light source the most according to claim 5, farther includes color filter unit, described color filter unit
Including yellow transmission filters, red transmission filter, green transmissive filter and diffusion area, and described color filter
Unit is moveable so that the light from described collecting lens sequentially enters described yellow transmission filters, described redness
Transmission filters, described green transmissive filter and described diffusion area, wherein:
Described phosphor area includes the yellow fluorescence body region being provided with the fluorophor of outgoing yellow fluorescence and is provided with
The green fluorescence body region of the fluorophor of outgoing green fluorescence；And
Yellow fluorescence from described yellow fluorescence body region sequentially enters described yellow transmission filters and described redness is saturating
Being emitted through filter, the green fluorescence from described green fluorescence body region enters described green transmissive filter, and from described
The blue light of reflector space enters described diffusion area.
7. a projector, including:
According to the light source described in any one in claim 1 to 6；
Display element, described display element modulates the light exported from described light source spatially to form image；With
Projection optics system, the image that described projection optics system amplifies and projection is formed by described display element.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2014/059508 WO2015151180A1 (en) | 2014-03-31 | 2014-03-31 | Light source device and projector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106164770A true CN106164770A (en) | 2016-11-23 |
| CN106164770B CN106164770B (en) | 2017-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480077709.XA Active CN106164770B (en) | 2014-03-31 | 2014-03-31 | Light source and projecting apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6202655B2 (en) |
| CN (1) | CN106164770B (en) |
| WO (1) | WO2015151180A1 (en) |
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| CN107300825A (en) * | 2017-07-14 | 2017-10-27 | 苏州佳世达光电有限公司 | Laser projection |
| CN107422595A (en) * | 2017-07-14 | 2017-12-01 | 苏州佳世达光电有限公司 | Laser projection |
| CN108693637A (en) * | 2017-04-10 | 2018-10-23 | 美题隆精密光学（上海）有限公司 | combination wheel for light conversion |
| CN108803222A (en) * | 2018-07-25 | 2018-11-13 | 苏州佳世达光电有限公司 | Polarization type Multiplexing apparatus and laser projection |
| CN109388005A (en) * | 2017-08-04 | 2019-02-26 | 夏普株式会社 | Light supply apparatus and grenade instrumentation |
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| CN111433671A (en) * | 2017-12-27 | 2020-07-17 | 麦克赛尔株式会社 | Projector with a light source |
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| JP6893298B2 (en) * | 2016-07-12 | 2021-06-23 | パナソニックＩｐマネジメント株式会社 | Light source device and projection type display device |
| CN108663879B (en) * | 2017-03-31 | 2021-04-06 | 中强光电股份有限公司 | Projector and illumination system thereof |
| US10310364B2 (en) | 2017-05-18 | 2019-06-04 | Panasonic Intellectual Property Management Co., Ltd. | Light source device and projection display apparatus |
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| CN110073290A (en) * | 2017-01-30 | 2019-07-30 | 日立乐金光科技株式会社 | Imaing projector |
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| CN111433671A (en) * | 2017-12-27 | 2020-07-17 | 麦克赛尔株式会社 | Projector with a light source |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6202655B2 (en) | 2017-09-27 |
| CN106164770B (en) | 2017-10-03 |
| WO2015151180A1 (en) | 2015-10-08 |
| JPWO2015151180A1 (en) | 2017-04-13 |
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