WO2009106122A1 - Projektor zum projizieren eines bildes und entsprechendes verfahren - Google Patents
Projektor zum projizieren eines bildes und entsprechendes verfahren Download PDFInfo
- Publication number
- WO2009106122A1 WO2009106122A1 PCT/EP2008/052253 EP2008052253W WO2009106122A1 WO 2009106122 A1 WO2009106122 A1 WO 2009106122A1 EP 2008052253 W EP2008052253 W EP 2008052253W WO 2009106122 A1 WO2009106122 A1 WO 2009106122A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- projector
- mirror
- deflection unit
- mirror element
- objective
- Prior art date
Links
Classifications
-
- 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
- G03B21/28—Reflectors in projection beam
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
- G02B17/0605—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors
- G02B17/0615—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using two curved mirrors off-axis or unobscured systems in wich all of the mirrors share a common axis of rotational symmetry
Definitions
- the invention relates to a projector for projecting an image, with a light source for generating a light beam, with a deflection unit, which is designed to deflect the light beam generated by the light source onto a projection surface, and with an imaging device for imaging an aperture or a mirror surface of the deflection on the projection surface.
- the present invention relates to a method of projecting an image by means of a projector.
- a miniature version of a laser projector with a scanner mirror (flying spot principle) applies, with which images are to be displayed on any projection surfaces of the highest quality.
- Approaches for such projectors are already known from the prior art. They generally comprise a light source which is designed to generate a light beam or a light bundle, wherein the light bundle is deflected towards a projection surface by means of a pivotable deflection unit, which oscillates in particular in two axes.
- the light source is able to generate the colors red, green and blue.
- the aperture of the deflection unit or the reflection surface of the scanner mirror as well as the nominal pixel size of the projected image form an optical system with an etendue or an optical conductivity of
- ⁇ 0 represents the maximum deflection angle, ie the double angle amplitude of the mirror oscillation
- r the radius of the reflection surface of the deflection unit
- N the number of pixels to be resolved in the considered oscillation plane on the projection surface.
- the beam waist is placed on the projection surface, the extent of the laser beam on the scanner mirror is greater than its area, which results in light losses.
- the energy that falls in the vicinity of the deflector or the scanner mirror on the comb structures of the mirror drive can detune the resonant frequency of the deflection and thus change the amplitude and phase of the mirror oscillation, which can lead to an undesirable change of the projected image.
- the beam waist can be placed between the deflection unit and the projection surface, in which case all undesired effects described can be expected.
- an imaging device which has the task of imaging the deflection unit or the scanner mirror onto the projection surface.
- an imaging device is arranged between the deflection unit and the projection surface, which imaging device has at least two-stage and afocal design is.
- the known imaging device is corrected distortion-free and has a magnification> 1.
- a disadvantage of the known imaging device is that a lens with a large number of individual lenses must be used in order to achieve the desired freedom from distortion while avoiding chromatic aberrations and a consequent deterioration of the image quality. Such a projection lens is thus hardly suitable for miniature projectors.
- the object of the present invention is to realize a projector and a method for projecting an image, wherein the imaging device is to provide a low-distortion and chromatic aberration-free image and can be realized inexpensively and compactly.
- a projector for projecting an image comprises a light source for generating a light beam and a deflection unit, which is designed to deflect the light beam generated by the light source onto a projection surface.
- the projector further comprises an imaging device for imaging an A- pertur the deflector on the projection surface.
- An essential idea of the invention is that the imaging device comprises a mirror objective with at least two mirror elements.
- a basic idea of the invention is to design the imaging device in favor of increasing the image quality such that it comprises a mirror objective in which at least two mirror elements are used to image the aperture or a reflection surface of the deflection unit onto the projection surface.
- the projector according to the invention that on the projection surface a distortion-free or compared to a projection without imaging device low distortion image can be generated.
- the projector should be designed so that a beam waist of the light source coming from the light source is placed on the aperture of the deflection, wherein the diameter of the beam waist is chosen to be slightly smaller than the diameter of the aperture, whereby an over-illumination of the deflection prevents and does not cause light losses become.
- the magnification of the mirror objective is chosen so that the image of the aperture of the deflection unit on the projection surface approximately matches the desired pixel size, and is preferably slightly smaller than the latter.
- a beam waist will also lie on or near the projection surface. It has been found that the depth of field of the image is fertil is not significantly reduced, so that at a realistic projection distance with the mirror objective does not need to be refocused.
- a realistic projection distance will be approximately 500 mm (300 to 1000 mm).
- the mirror objective preferably has a magnification greater than or equal to one, so that the scanned angular range after the mirror objective is at least as large as the angular range coming from the deflection unit.
- a deflection unit with a low maximum deflection angle can be used, whereby the deflection unit can be realized cost-effectively and with more freedom for frequency and aperture size.
- the angular magnification by the mirror objective can be the same or different sizes for both directions of the mirror oscillation.
- the opening angle of the scanned angle range after the deflection unit in the horizontal and vertical directions is 5 °
- the mirror objective is preferably formed such that the opening angle is 12 ° in the horizontal direction and 10 ° in the vertical direction.
- the deflection unit comprises at least one scanner mirror or micromirror or micromirror. roscanner, which is movable, in particular pivotable about two axes, is formed. By using a simple scanner mirror, a cost-reduced as well as a component-reduced projector is created.
- the deflection unit may comprise two separate micromirrors oscillating in one direction. In this case, the mirror objective is designed in particular such that the beam waist is imaged onto the projection surface on the primary micromirror in the light direction.
- the light source comprises at least one diode-pumped solid-state laser (RGB laser source), wherein the projector is designed in particular as a laser projector.
- the light source can be modulated directly or comprise a modulation unit, which is designed to modulate the light beam.
- the light source for modulating the light beam is formed in response to a movement of the deflection unit.
- three colors, red, green and blue are generated, modulated and combined to form a light bundle, in particular a laser bundle, which already contains all image information.
- reflection surfaces of the at least two mirror elements are each formed as a rotation body generated by a rotation of a conic section around a rotation axis.
- the conic sections may be hyperbolas.
- the rotational bodies have a common axis of rotation.
- the quotient of the numerical eccentricity of the second conic section to the numerical eccentricity of the first conic section is in a value range from 0.6 to 0.8, in particular 0.7. It is particularly advantageous if the numerical eccentricity of the first conic section lies in a value range of 5 to 7, in particular 6.
- the deflection unit is arranged in a focal point of the first of the hyperbolic mirror elements of the mirror objective or in its immediate vicinity.
- the deflection unit should be arranged at a distance of less than 2 mm, in particular smaller than 1 mm, from the first focal point of the first mirror element.
- the mirror objective is designed such that a second focal point of the first mirror element coincides with a first focal point of the second mirror element.
- one of the mirror elements has a convex and the other has a concave shape.
- a reflection surface of the first mirror element facing the second mirror element should be concave and a reflection surface of the second mirror element facing the first mirror element should be convex. In this way, a first reflection takes place at the concave and a second reflection at the convex reflection surface.
- the distance between the first and the second focal point of the first mirror element is less than 20 mm, and that the quotient of the distance between the focal points of the first mirror element to the distance between the focal points of the second mirror element is preferably in a value range from 1.2 to 1.8, in particular 1.5.
- the projector is designed such that, after passing through the mirror lens to a lower
- Edge of the image pointing light beam at an angle of 0 ° to 20 °, in particular by an angle of 5 ° to 10 °, in the vertical direction is higher than the light beam before passing the mirror lens.
- the projector may preferably be formed as a separate device or integrated into a parent device, such as a mobile phone, a digital camera or a video camera.
- the projector preferably has a pivoting or folding device arranged on a housing of the projector or of a parent device, by means of which the second mirror element is held and between a starting position, in which its rear side terminates with the housing, and a reflection position, in which the emission of the light beam from the housing is possible, is pivotable.
- the second mirror element projects at least partially from the housing in the reflection position.
- a passage opening for the light beam is formed in the reflection position of the second mirror element in the housing, so that a radiation of the light beam from the housing is made possible. In the starting position of the second of the mirror elements, this passage opening can preferably be closed by the pivotable second mirror element.
- the pivoting of the second mirror element into the reflection position causes the projector to be switched on.
- the at least two mirror elements are arranged at least partially in a housing of the projector or a parent device.
- the housing may have a disk element, through which the light source bundle comes out of the housing.
- the at least two mirror elements are arranged completely in the housing.
- one of the mirror elements is arranged in conformity with an outer surface of a housing of the projector or of a parent device.
- the housing may have a base body and a substantially spherical part arranged on the base body, wherein the second mirror element is preferably arranged on the substantially spherical part of the housing, so that a shape of a convex reflection surface of the second mirror element with the Form of an outer surface of the substantially spherical part of the housing is almost identical.
- the housing may have a passage opening, which may preferably be formed on a side of the base body facing the second mirror element.
- a method according to the invention is designed for projecting an image with the aid of a projector.
- a light beam is generated by means of a light source and deflected by means of a deflection unit towards a projection surface, wherein an aperture of the deflection unit is imaged on the projection surface by means of a mapping device.
- a basic idea with the method is that the aperture of the deflection unit is imaged onto the projection surface by means of a mirror objective of the imaging device with at least two mirror elements.
- Advantageous embodiments of the projector according to the invention are to be regarded as advantageous embodiments of the method according to the invention.
- FIG. 1 shows a schematic representation of a laser projector with a scanner mirror as a deflection unit according to the prior art
- Fig. 2 shows a distorted image generated by a conventional laser projector with a scanner mirror vibrating in two axes
- FIG. 3 shows a mirror objective for a laser projector according to an embodiment of the invention
- FIG. 4 is a sectional view of a mirror objective with two mirror elements according to an embodiment of the invention.
- FIG. 5 is a schematic representation of the embedding of a laser projector in a housing according to FIG.
- FIG. 6 shows a schematic representation of the embedding of a laser projector in a housing according to a further embodiment
- 7 shows a schematic illustration of a laser projector according to a further exemplary embodiment
- FIG. 8 shows aberration-related spot sizes in comparison with an XGA pixel size for the mirror objective according to a preferred embodiment of the invention
- FIG. 10 shows the image field which shows a low-distortion image produced by the mirror objective according to an embodiment of the invention
- Fig. 11 Aberrations facultye spot sizes for the mirror lens according to the preferred embodiment of the invention as a function of a Giionsab- Standes compared to an XGA pixel size to illustrate the depth of field.
- a projector 1 shown in FIG. 1, in the present case a laser projector, according to the prior art comprises a light source 2 which in the present case comprises a plurality of diode-pumped solid-state lasers (RGB laser source).
- the Lichtquel- Ie 2 has the task for three colors, red, green and blue, each generating a beam of light to modulate them and to a light beam, in the present case a laser bundle, to combine, which contains all image information.
- the light source 2 comprises three laser units 2a, 2b, 2c, which are designed to generate one color each.
- the laser projector 1 also has a deflection unit 3, which in the present example comprises a scanner mirror.
- the scanner mirror 3 has an aperture or a reflection surface 3a and in the present case is pivotable about two axes, a horizontal pivot axis A and about a vertical pivot axis B.
- the laser projector 1 according to the prior art comprises a screen 4, which has a projection surface 5 on which the image is generated by means of the light beam. The image is generated on the projection surface 5 by passing the light bundle already containing all the image information through the scanner mirror 3 over the projection surface 5.
- a disadvantage of this known projection method is the small etendue, so that there are limitations with regard to image brightness or quality.
- FIG. 3 shows an example of a mirror objective 7, comprising a first and a second mirror element 8, 9, which is designed to image the aperture 3a on the projection surface 5 of the screen 4.
- the spot of the laser beam on the projection surface 5 of the screen 4 remains smaller than the nominal pixel size, whereby a deterioration of the resolution is prevented.
- the first mirror element 8 has a concave reflection surface 8a, the second mirror element 9 having a convex reflection surface 9a facing the concave reflection surface 8a of the first mirror element 8.
- the reflection surfaces 8a, 9a of the two mirror elements 8, 9 are each designed as a rotation body generated by a rotation of a conic section about a rotation axis.
- the two conic sections are hyperbolas; the two rotary bodies 8a, 9a have in the preferred embodiment, a common axis of rotation (not shown).
- a geometric sectional representation of the mirror objective 7 in a two-dimensional coordinate system is reproduced in FIG. 4.
- the scanner mirror 3 is arranged in the coordinate origin (0,0), its maximum angular deflection is 5 ° and the angle of incidence to the x-axis is 10 °, resulting in a reflected angle range a between 0 ° to 20 °.
- a light beam reflected by the scanner mirror 3 is subsequently reflected by the concave reflection surface 8a of the first mirror element 8, then by the convex reflection surface 9a of the second mirror element 9 in the direction of the projection surface 5 (not shown in FIG. 4).
- the scanner mirror 3 is arranged in the example in a first focal point Bl of the first mirror element 8, a second focal point B2 of the first mirror element 8 coinciding with a first focal point Cl of the second mirror element 9.
- the quotient of the distance between the focal points Bl, B2 of the first mirror element 8 to the distance between the first focal point Cl and a second focal point (not shown) of the second mirror element 9 is 1.4.
- the distance between the first and second focal points Bl, B2 of the first mirror element 8 is 19.3 mm.
- a laser projector 1 according to an embodiment of the invention is shown with respect to a mechanical embodiment in FIG.
- the laser projector 1 can be designed as a separate device or embedded in a parent device (mobile phone, digital camera, video camera).
- a light source 2 which in the present case a plurality of diode-pumped solid-state laser comprises, and a deflection mirror 11, which has the task of reflecting a light beam 12 generated by the light source 2 to a deflection unit 3, arranged.
- the deflection unit 3 comprises a scanner mirror.
- the laser projector 1 has a first and a second mirror element 8, 9, which are designed to image the scanner mirror 3 on the projection surface in the manner explained in more detail above.
- the housing 10 of the laser projector 1 comprises a pivoting device 13, by means of which the second mirror element 9 is held and pivotable between a starting position shown in FIG. 5 above and a reflection position shown in FIG.
- the light source should be turned off, whereas in the reflection position, the emission of the light beam 12 is made possible from the housing 10.
- a passage opening 14 is formed, through which the light beam 12 is to be emitted during operation. In the initial position, the passage opening 14 is closed by means of the second mirror element 9.
- a laser projector 1 according to another embodiment is shown with respect to a mechanical embodiment in FIG.
- the laser projector 1 illustrated in FIG. 6 comprises essentially the same elements as the laser projector 1 shown in FIG. 5, so that the differences between the examples are discussed solely.
- the housing has 10 a base body 10a, in which the light source 2 and the scanner mirror 3 are arranged.
- the housing 10 further comprises an element 10 b arranged on the main body 10 and substantially spherical.
- the second mirror element 9 is arranged on an outer surface 10c of the substantially spherical part 10b so that the convex reflection surface 9a of the second mirror element 9 is embedded in the surface 10c of the part 10b.
- a laser projector 1 according to another embodiment of the invention is shown in FIG. 7 with respect to a mechanical embodiment.
- both the first and the second mirror element 8, 9 are completely arranged in the housing 10 of the laser projector 1.
- the housing 10 comprises an exit window or disk element 15, through which the light beam 12 is emitted from the housing 10.
- FIGS. 8 to 11 illustrate the image quality achieved with the mirror objective 7, comprising two mirror elements 8, 9.
- FIG. 8 shows aberration-induced geometric spot images over an entire field given by the scanner mirror 3 of ⁇ 12 ° horizontal and 0 ° to 20 ° vertically compared to the pixel size at XGA resolution, which is shown in FIG. 8 by means of a bar C is indicated.
- the XGA pixel size here is 280 ⁇ m.
- a first spot 16 is associated with a deflection angle of the light beam deflected by the deflection unit 3 in a horizontal direction of -12 ° and in a vertical direction of 0 °, which corresponds to an image coordinate point (-106.889 mm; 13.550 mm) at the projection surface.
- a spot 17 is a distraction angle in the horizontal direction of 20 ° and in the vertical direction of 12 °, which corresponds to the projection screen an image coordinate point (103,950 mm, 195,909 mm). As shown in Fig. 8, all spot sizes are smaller than the XGA pixel size, so that it is achieved that no deterioration of the resolution can degrade the quality of the image.
- FIG. 9 shows a cross section through a beam waist on the projection surface for a wavelength of the laser beam 550 nm and a deflection angle in the horizontal direction of 0 ° and in the vertical direction of -12 °.
- the beam waist here is 160 ⁇ m and is thus smaller than the XGA pixel size.
- FIG. 10 shows corner points of a nearly rectangular image generated by the laser projector 1 with the mirror objective 7.
- FIG. 11 shows the spot images as a function of the defocus for all deflection angles in comparison to an XGA pixel size.
- each column is assigned a different defocusing (in ⁇ m), each row being associated with a different deflection angle (in the horizontal and vertical directions).
- the pixel size of 280 ⁇ m is indicated in FIG. 11 for a projection distance of 500 mm on the basis of a bar B. As it grows in proportion to the projection distance, all the spot images remain smaller than the pixel size, at least for projection distances of 300 mm to 600 mm.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Projection Apparatus (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/052253 WO2009106122A1 (de) | 2008-02-25 | 2008-02-25 | Projektor zum projizieren eines bildes und entsprechendes verfahren |
KR1020107021473A KR101213636B1 (ko) | 2008-02-25 | 2008-02-25 | 이미지를 투사하기 위한 투사기 및 대응 방법 |
CN200880127461.8A CN101965532B (zh) | 2008-02-25 | 2008-02-25 | 用于投影图像的投影仪以及相应的方法 |
US12/735,545 US8398249B2 (en) | 2008-02-25 | 2008-02-25 | Projector for projecting an image and corresponding method |
TW098104809A TWI451132B (zh) | 2008-02-25 | 2009-02-16 | 圖像之投影用的投影機及對應的方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/052253 WO2009106122A1 (de) | 2008-02-25 | 2008-02-25 | Projektor zum projizieren eines bildes und entsprechendes verfahren |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009106122A1 true WO2009106122A1 (de) | 2009-09-03 |
Family
ID=39929753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/052253 WO2009106122A1 (de) | 2008-02-25 | 2008-02-25 | Projektor zum projizieren eines bildes und entsprechendes verfahren |
Country Status (5)
Country | Link |
---|---|
US (1) | US8398249B2 (de) |
KR (1) | KR101213636B1 (de) |
CN (1) | CN101965532B (de) |
TW (1) | TWI451132B (de) |
WO (1) | WO2009106122A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8690358B2 (en) * | 2011-06-27 | 2014-04-08 | Microsoft Corporation | Video projection device for mobile device having a first projection surface integral with a surface of the mobile device |
US8757494B2 (en) * | 2011-09-27 | 2014-06-24 | Symbol Technologies, Inc. | Illumination system in imaging scanner |
CN103543823B (zh) | 2012-07-13 | 2016-08-03 | 光宝科技股份有限公司 | 具有多重投影功能的可携式电子装置 |
USD758372S1 (en) * | 2013-03-13 | 2016-06-07 | Nagrastar Llc | Smart card interface |
US9888283B2 (en) | 2013-03-13 | 2018-02-06 | Nagrastar Llc | Systems and methods for performing transport I/O |
DE102014108633B9 (de) * | 2014-06-18 | 2024-07-04 | Kulzer Gmbh | Vorrichtung und Verfahren zur Herstellung dreidimensionaler Objekte mittels Rapid-Prototyping |
USD864968S1 (en) | 2015-04-30 | 2019-10-29 | Echostar Technologies L.L.C. | Smart card interface |
JP2017125942A (ja) * | 2016-01-14 | 2017-07-20 | ソニー株式会社 | レンズモジュール、およびプロジェクタ |
JPWO2018003400A1 (ja) * | 2016-06-30 | 2019-04-18 | パナソニックIpマネジメント株式会社 | 画像投写装置 |
DE102017206100B4 (de) * | 2017-04-10 | 2019-10-02 | BSH Hausgeräte GmbH | System zur Projektion von Bildinformation und Verfahren zur Projektion eines Bildes |
CN108961329B (zh) * | 2018-06-22 | 2020-10-30 | 成都极米科技股份有限公司 | 投影仪空间位置信息的采集方法、装置和计算机可读存储介质 |
Citations (5)
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DE2822579A1 (de) * | 1978-05-24 | 1979-11-29 | Zeiss Carl Fa | Astigmatismusfreies und komafreies zweispiegel-abbildungssystem mit grosser apertur, grossem sehfeld und grossem abstand der eintrittspupille |
EP1450558A1 (de) * | 2003-02-18 | 2004-08-25 | Canon Kabushiki Kaisha | Anzeigesystem mit Raster-Abtastung |
US20050041220A1 (en) * | 2001-09-04 | 2005-02-24 | Toshihiro Sunaga | Projection optical system and optical system |
EP1592238A1 (de) * | 2004-04-29 | 2005-11-02 | Hewlett-Packard Development Company, L.P. | Reflektierende optische Vorrichtung |
US20060007362A1 (en) * | 2004-06-09 | 2006-01-12 | Samsung Electronics Co., Ltd. | Apparatus for and method of scaling a scanning angle and image projection apparatus incorporating the same |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US4239394A (en) * | 1977-04-08 | 1980-12-16 | A/S Foss Electric | Liquid analyzing apparatus |
USRE32648E (en) * | 1982-04-07 | 1988-04-19 | Constantin Systems, Inc. | Opaque projector |
FR2868552A1 (fr) * | 2004-03-30 | 2005-10-07 | Thomson Licensing Sa | Module de projection, moteur optique et appareil de projection correspondant |
TWI295746B (en) * | 2005-08-01 | 2008-04-11 | Delta Electronics Inc | Digital light-processing projection apparatus and beam splitter module thereof |
TW200742209A (en) * | 2006-04-18 | 2007-11-01 | Zebex Ind Inc | Projector using laser light source |
-
2008
- 2008-02-25 US US12/735,545 patent/US8398249B2/en active Active
- 2008-02-25 CN CN200880127461.8A patent/CN101965532B/zh active Active
- 2008-02-25 KR KR1020107021473A patent/KR101213636B1/ko not_active IP Right Cessation
- 2008-02-25 WO PCT/EP2008/052253 patent/WO2009106122A1/de active Application Filing
-
2009
- 2009-02-16 TW TW098104809A patent/TWI451132B/zh active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2822579A1 (de) * | 1978-05-24 | 1979-11-29 | Zeiss Carl Fa | Astigmatismusfreies und komafreies zweispiegel-abbildungssystem mit grosser apertur, grossem sehfeld und grossem abstand der eintrittspupille |
US20050041220A1 (en) * | 2001-09-04 | 2005-02-24 | Toshihiro Sunaga | Projection optical system and optical system |
EP1450558A1 (de) * | 2003-02-18 | 2004-08-25 | Canon Kabushiki Kaisha | Anzeigesystem mit Raster-Abtastung |
EP1592238A1 (de) * | 2004-04-29 | 2005-11-02 | Hewlett-Packard Development Company, L.P. | Reflektierende optische Vorrichtung |
US20060007362A1 (en) * | 2004-06-09 | 2006-01-12 | Samsung Electronics Co., Ltd. | Apparatus for and method of scaling a scanning angle and image projection apparatus incorporating the same |
Also Published As
Publication number | Publication date |
---|---|
KR20100121681A (ko) | 2010-11-18 |
CN101965532A (zh) | 2011-02-02 |
TW200942860A (en) | 2009-10-16 |
US8398249B2 (en) | 2013-03-19 |
CN101965532B (zh) | 2015-01-14 |
US20100302516A1 (en) | 2010-12-02 |
TWI451132B (zh) | 2014-09-01 |
KR101213636B1 (ko) | 2012-12-18 |
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