WO2007115664A1 - Système de projection et d'éclairage dans lequel sont utilisées des lentilles avec eléments optiques diffractifs - Google Patents

Système de projection et d'éclairage dans lequel sont utilisées des lentilles avec eléments optiques diffractifs Download PDF

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Publication number
WO2007115664A1
WO2007115664A1 PCT/EP2007/002556 EP2007002556W WO2007115664A1 WO 2007115664 A1 WO2007115664 A1 WO 2007115664A1 EP 2007002556 W EP2007002556 W EP 2007002556W WO 2007115664 A1 WO2007115664 A1 WO 2007115664A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
lenses
fresnel
refractive
optical elements
Prior art date
Application number
PCT/EP2007/002556
Other languages
German (de)
English (en)
Other versions
WO2007115664A8 (fr
Inventor
Melvin Francis
Original Assignee
Oc Oerlikon Balzers Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102006016582A external-priority patent/DE102006016582A1/de
Priority claimed from US11/409,506 external-priority patent/US20070247715A1/en
Application filed by Oc Oerlikon Balzers Ag filed Critical Oc Oerlikon Balzers Ag
Publication of WO2007115664A1 publication Critical patent/WO2007115664A1/fr
Publication of WO2007115664A8 publication Critical patent/WO2007115664A8/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3152—Modulator illumination systems for shaping the light beam

Definitions

  • Projection illumination system using lenses with diffractive optical elements.
  • This invention relates to lighting systems in which both refractive lenses and diffractive optical elements are used.
  • this invention relates to lighting systems in projectors in which the diffraction-based lenses otherwise used to correct the chromatic aberrations have been at least partially replaced by diffractive optical lenses.
  • Figure 1 shows, according to the prior art, a typical projector 100.
  • a typical projector 100 can be used for example in a front projector or a rear projection device.
  • a well-known application example is the television.
  • the lamp 102 provides light which is homogenized by the integrator 104.
  • Integrator 104 may be, for example, an inwardly mirrored cavity. The light from the lamp 102 is then reflected many times on its way through the cavity of the mirroring. Since the cavity has a rectangular cross section, this results in a rectangular, uniformly illuminated light field at the output of the integrator 104.
  • the lenses 108 in the illumination beam path may comprise, for example, three aspherical glass lenses 108-L1, 108-L2, and 108-L3, as shown in FIG.
  • the task of the lenses 108 in the illumination beam path is to project the homogeneous light field at the output of the integrator 104 through the prism 110 onto the SLM 118.
  • the use of these lenses has some problems.
  • Second, such systems often show errors, such as chromatic aberrations. This is due to the fact that the lenses have different focal lengths for different wavelengths of light. That is, the homogeneous light field at the output of the integrator 104 is inhomogeneously projected onto the SLM 118 in terms of size and color. Expensive lens combinations of partially different glass materials must therefore be used to suppress the aberrations sufficiently far.
  • the focal length of a convex or piano-convex lens used in practice is therefore typically smaller for blue light than for red light. This is true for both the classic continuous-lens refractive lens and the Fresnel lens discussed above.
  • diffractive optical elements have a completely different dispersion behavior. Diffraction is the dominant effect when two or more spatially laterally separated beams are coherently combined and interfere, for example, constructively or destructively. This leads to a so-called diffraction pattern.
  • a diffractive optical element must have structures small enough to combine spatially coherent rays as desired.
  • the best known of these diffractive optical elements is the diffraction grating.
  • Ti 1 and n 2 are the refractive indices of the surrounding media, which can be set equal to 1, if it is air.
  • the integer m indicates the diffraction order, ⁇ is the wavelength of the radiation used, and ⁇ is the grating period of the diffraction grating. It can be read from this grating equation that light with a shorter wavelength (for example, blue light) is diffracted into smaller angles than light with a longer wavelength, that is, for example, red light.
  • Fresnel lens is used for Fresnel lenses whose minimum zone width is greater than or equal to 200 ⁇ m, while the term “diffractive Fresnel lens” is used for lenses having Fresnel zones having a width less than 200 ⁇ m ,
  • a diffractive Fresnel lens there are different designs of a diffractive Fresnel lens. If there is a continuous profile within the Fresnel zones, the term "kinoform" is used diffractive Fresnel lens, in which the profile is approximated within a zone with a binary staircase function.
  • improved chromatic properties can be achieved by combining in a lighting system a refractive lens with a diffractive Fresnel lens such that the material dispersion is largely compensated by the dispersion due to the diffraction.
  • the refractive lens and the diffractive Fresnel lens can be realized on various substrates.
  • the diffractive Fresnel lens is realized on a surface (front or back) of one of the refractive lenses of the illumination system.
  • One embodiment which works well is a plastic refractive Fresnel lens in whose Fresnel surface a cinema form is realized.
  • plastic molded lenses are thin, lightweight and easy to manufacture.
  • the use of the kinoform leads to improved chromatic properties of the illumination system.
  • Figure 1 shows a block diagram of a prior art projector comprising a typical lighting system.
  • Figure 2 shows a cross section of the lenses forming a lighting system according to the prior art.
  • FIG. 3 shows a cross-section of lenses according to a first embodiment of the illumination system according to the invention.
  • FIG. 4 shows a perspective view of a projector with the illumination system according to FIG. 3.
  • FIGS. 5A to 5C show views of the rear side, the front side and the cross section of one of the lenses from FIG. 3.
  • FIG. 6 shows a first embodiment of a lens in FIG. 3. Details are shown in an exaggerated manner for illustrative purposes.
  • FIG. 7 shows a second embodiment of a lens in FIG. 3. Details are shown in an exaggerated manner for illustrative purposes.
  • FIG. 8 shows a third embodiment of a lens in FIG. 3. Details are shown in an exaggerated manner for illustrative purposes.
  • FIG. 3 shows a cross-section of the lenses 308-L1, 308-L2 and 308-L3 forming a first embodiment of the illumination optics according to the present invention.
  • lens 308-Ll is a refractive Fresnel lens and 308-L2 is an element that includes a refractive and a diffractive Fresnel lens, while the lens 308-L3 is a classical converging lens.
  • the lens 308-L2 comprises a surface with a diffractive Fresnel lens for correction of chromatic aberrations. This is better shown in FIGS. 6 to 8, wherein it is clear here that the diffractive Fresnel lens used for this example is a kinoform.
  • all three substrates could comprise refractive Fresnel lenses, or all three substrates could comprise refractive classical convergent lenses. sen.
  • more than one of the lenses or surfaces could include diffractive optical elements.
  • FIG. 4 shows a perspective view of a projection system 400 in which an illumination optical unit according to FIG. 3 is used.
  • the light integrator 104 irradiates a homogeneous light distribution to the color filter 106, which is a color wheel in this case.
  • the lenses 308a and 308b include refractive Fresnel lenses while the lens 308c is a classic continuous aspheric aspirating lens.
  • the prism component 410 transmits light from the lens 308c to the SLM 118.
  • the SLM is, for example, a MEMS element (Micro-Electro-Mechanical System) with a plurality of mirrors that can be tilted independently of each other and thus each one on or represent an off state. Those mirrors that are tilted to represent the on-state reflect the incident light at an angle such that it is totally reflected by the prism 410. Such modulated light 412 is transmitted to the projection lens 114. On the other hand, light from those mirrors that are tilted so as to represent the off-state is not totally reflected and is transmitted and removed beyond the prism 410, for example.
  • MEMS element Micro-Electro-Mechanical System
  • a MEMS device was used as SLM.
  • Other projectors include as SLM an LCD device.
  • the principle of the present invention is readily transferable as described.
  • FIGs 5A to 5C show rear side and front views of an embodiment of one of the lenses in Figure 3.
  • the size of the structures is exaggerated to show the Fresnel zones.
  • Both lenses (308-L1 and lens 308-L2) look like this because the kinoform is not is visible without enlarging the view much further (see Figures 6-8).
  • Figure 5A shows the rear view of a lens.
  • Figure 5B shows a cross section illustrating the exaggerated Fresnel zones.
  • Figure 5C is a front view. Here the Fresnel rings are clarified.
  • Figures 6A and 6B show a first embodiment of the lens 308-L1.
  • the structures are greatly exaggerated.
  • Figure 6A shows a cross section of the lens and
  • Figure 6B shows an enlarged section of this cross section.
  • FIG. 6A is identical to FIG. 5B.
  • the kinoform is therefore not visible.
  • FIG. 6B shows the kinoform on the flat rear side of the lens. It should be emphasized once again that the Fresnel zones of the refractive lens and the kinoform are shown greatly enlarged here in order to illustrate them in the figure.
  • D r 10mm -4 / (90mm) * r 2 , where r is the radial distance from the center of the lens. This leads to a lens diameter of 30mm.
  • N I belongs to the central zone, which does not form a ring but a lenticular central area. This central area has a radius of R, 4.74mm
  • r is the radial distance from the center of the lens. This in turn leads to a lens diameter of 30mm.
  • This lens is now modified into a Fresnel lens. Starting from the outer edge of the lens, whenever its thickness exceeds 1 ⁇ m, a discontinuity is introduced and the thickness is reduced to zero. This marks the start of a new Fresnel zone.
  • the radii of these discontinuities are given by the following formula
  • Fresnel lens is a diffractive lens in which diffraction effects play an essential role.
  • the two lenses described above could be placed on separate substrates in the illumination beam path.
  • Such a substrate could be a disc-shaped plastic substrate. It is possible to realize the refractive Fresnel lens on one side of the disk and to realize the kinoform on the other side. Another possibility is to integrate the kinoform directly into the profile of the refractive Fresnel lens.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

Dans le projecteur selon l'invention comportant un dispositif d'éclairage qui comporte une source de lumière et des éléments optiques pour la formation du champ lumineux généré par la source de lumière sur un obturateur de lumière, peuvent également être introduites des lentilles réfringentes ainsi que des éléments optiques diffractifs. Dans un mode de réalisation, une lentille de Fresnel dans la surface de laquelle est intégrée une kinoforme est utilisée. Cette lentille peut être fabriquée par moulage par injection dans une étape unique.
PCT/EP2007/002556 2006-04-06 2007-03-22 Système de projection et d'éclairage dans lequel sont utilisées des lentilles avec eléments optiques diffractifs WO2007115664A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102006016582.9 2006-04-06
DE102006016582A DE102006016582A1 (de) 2006-04-06 2006-04-06 Projektions- Beleuchtungssystem, in dem Linsen mit diffraktiv optischen Elementen verwendet werden
US11/409,506 2006-04-21
US11/409,506 US20070247715A1 (en) 2006-04-21 2006-04-21 Projection illumination systems lenses with diffractive optical elements

Publications (2)

Publication Number Publication Date
WO2007115664A1 true WO2007115664A1 (fr) 2007-10-18
WO2007115664A8 WO2007115664A8 (fr) 2007-11-29

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TW (1) TW200745719A (fr)
WO (1) WO2007115664A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109946908A (zh) * 2017-12-20 2019-06-28 长光华大基因测序设备（长春）有限公司 一种匀光棒及照明系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI838385B (zh) * 2019-07-01 2024-04-11 揚明光學股份有限公司 投影鏡頭及投影光機

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161057A (en) * 1988-09-12 1992-11-03 Johnson Kenneth C Dispersion-compensated fresnel lens
WO1994022048A1 (fr) * 1993-03-23 1994-09-29 Optica Nova Onab Ab Dispositif d'eclairage pour projecteur
US5546202A (en) * 1994-06-17 1996-08-13 Hughes Training, Inc. Rear projection screen for high ambient light environments having a pinhole area substantially equal to luminous area of the light source
EP0802685A2 (fr) * 1996-04-17 1997-10-22 Hitachi, Ltd. Dispositif indicateur de cristal liquide avec une plaque individuelle
EP1006400A2 (fr) * 1998-12-02 2000-06-07 Kuraray Co., Ltd. Dispositif optique et feuille lentille de Fresnel
US6304381B1 (en) * 1999-02-17 2001-10-16 Minolta Co., Ltd. Illumination optical apparatus
EP1302812A2 (fr) * 2001-10-12 2003-04-16 Samsung Electronics Co., Ltd. Système d'illumination et projecteur utilisant un tel système
WO2003087930A1 (fr) * 2002-04-06 2003-10-23 Samsung Electronics Co., Ltd. Systeme d'eclairage hautement efficace, unite de defilement et systeme de projection utilisant ces elements
US6646806B1 (en) * 2002-05-17 2003-11-11 Infocus Corporation Polarized light source system with dual optical paths
US6778326B1 (en) * 1995-03-29 2004-08-17 Eastman Kodak Company Combined heat filter and condenser lens, a projection type apparatus using such, and a method for fabricating it

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161057A (en) * 1988-09-12 1992-11-03 Johnson Kenneth C Dispersion-compensated fresnel lens
WO1994022048A1 (fr) * 1993-03-23 1994-09-29 Optica Nova Onab Ab Dispositif d'eclairage pour projecteur
US5546202A (en) * 1994-06-17 1996-08-13 Hughes Training, Inc. Rear projection screen for high ambient light environments having a pinhole area substantially equal to luminous area of the light source
US6778326B1 (en) * 1995-03-29 2004-08-17 Eastman Kodak Company Combined heat filter and condenser lens, a projection type apparatus using such, and a method for fabricating it
EP0802685A2 (fr) * 1996-04-17 1997-10-22 Hitachi, Ltd. Dispositif indicateur de cristal liquide avec une plaque individuelle
EP1006400A2 (fr) * 1998-12-02 2000-06-07 Kuraray Co., Ltd. Dispositif optique et feuille lentille de Fresnel
US6304381B1 (en) * 1999-02-17 2001-10-16 Minolta Co., Ltd. Illumination optical apparatus
EP1302812A2 (fr) * 2001-10-12 2003-04-16 Samsung Electronics Co., Ltd. Système d'illumination et projecteur utilisant un tel système
WO2003087930A1 (fr) * 2002-04-06 2003-10-23 Samsung Electronics Co., Ltd. Systeme d'eclairage hautement efficace, unite de defilement et systeme de projection utilisant ces elements
US6646806B1 (en) * 2002-05-17 2003-11-11 Infocus Corporation Polarized light source system with dual optical paths

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109946908A (zh) * 2017-12-20 2019-06-28 长光华大基因测序设备（长春）有限公司 一种匀光棒及照明系统

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TW200745719A (en) 2007-12-16
WO2007115664A8 (fr) 2007-11-29

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