WO2008046274A1 - Projecteur équipé de miroir à réflexion en dents de scie - Google Patents

Projecteur équipé de miroir à réflexion en dents de scie Download PDF

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Publication number
WO2008046274A1
WO2008046274A1 PCT/CN2007/000471 CN2007000471W WO2008046274A1 WO 2008046274 A1 WO2008046274 A1 WO 2008046274A1 CN 2007000471 W CN2007000471 W CN 2007000471W WO 2008046274 A1 WO2008046274 A1 WO 2008046274A1
Authority
WO
WIPO (PCT)
Prior art keywords
sawtooth
mirror
projector
display screen
display
Prior art date
Application number
PCT/CN2007/000471
Other languages
English (en)
Chinese (zh)
Inventor
Fisher Huang
Original Assignee
Butterfly Technology (Shenzhen) Limited
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
Application filed by Butterfly Technology (Shenzhen) Limited filed Critical Butterfly Technology (Shenzhen) Limited
Publication of WO2008046274A1 publication Critical patent/WO2008046274A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G02B5/09—Multifaceted or polygonal mirrors, e.g. polygonal scanning mirrors; Fresnel mirrors
    • 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

Definitions

  • the present invention relates to a projector, and more particularly to a projector having a sawtooth type mirror. Background technique
  • the projection display only needs to change the size of the screen and the chassis, and the size of the circuit board or the optical machine itself is not significantly increased. Therefore, in the large-sized display field, the projection display is still dominant.
  • the projection device can be divided into a front projection type projection device on the same side of the display screen as the light machine and the viewer, and a rear projection type projection device hidden in the chassis behind the display screen.
  • a front projection type projection device on the same side of the display screen as the light machine and the viewer
  • a rear projection type projection device hidden in the chassis behind the display screen.
  • another often observed focus is often on the size of the chassis to be as miniaturized as possible. That is, as the display height and width increase, the beam is correctly projected to the relative pixel position on the display screen within a limited minimum thickness and is accurately focused.
  • the rear projection type projection apparatus 1 has a casing (not shown), an optical machine 11 housed in the casing, a lens group 12, and a mirror group.
  • the display screen 14 has a multi-layer Fresnel lens structure with inner and outer concentric as shown in FIG. 2 including an internal total reflection Fresnel lens region 141, a transmissive region 142, and a conventional refractive fluorescing lens region 143.
  • the lens group includes a relay lens group 121 and a wide-angle lens group 122.
  • the wide-angle lens group 122 will be from the optical machine 11 and pass through the relay lens.
  • the modulated beam of group 121 diverges to a broad solid angle of approximately 153 degrees and is ultimately diverted by display 14 to approximately the front side of the chassis.
  • the concentric circular multi-level groove structure of the display screen 14 is extremely and complicated, and the fabrication is quite difficult.
  • the wide-angle lens group 122 uses a plurality of concave lenses with increasing radius to allow the solid angle of the traveling beam to gradually divergence.
  • polishing error of each lens away from the center of the lens increases, and the error caused by the increase of the lens radius increases, it is easy to form a phase difference near the edge portion and it is difficult to correctly focus. Therefore, such a large-scale use of an aspherical lens structure will increase manufacturing difficulty, lower yield, and is expensive, making it difficult to promote such a projection apparatus.
  • the invention of US Pat. No. 6,631,994 discloses a mirror 23 which can cause pincushion distortion, and the incident light beams are respectively reflected according to different incident angles;
  • the angle between the beams reflected at the upper and lower ends is larger than the angle between the original incident beams and reaches an angle of about 160 degrees. That is, the reflected light beam is largely dispersed, so that the purpose of greatly enlarging the image projected by the original optical machine 21 is achieved in a short distance, and the front-rear distance of the rear projection television is shortened to constitute a thin projection display 2.
  • the image is positively distorted as shown in FIG. 5(C).
  • FIG. 5(B) The invention is disclosed between the mirror 23 and the optical machine 21, and a preset is made as shown in FIG. 5(B).
  • the lens group 22 of the barrel distortion is shown such that the light source 20 is projected by the optical machine 21 of the digital micro-mirror device (DMD) architecture as shown in Fig. 5 (A).
  • the image shown is negatively distorted first, and then correctly deformed by the mirror to be correctly formed as shown in Fig. 5(D) and displayed on the display screen 24.
  • FIG. 6 is only a simplified illustration, in which all the light beams projected by the optical machine 31 are represented by only the uppermost and lowermost two main rays 35, 36, and the reflection of the mirror 33 is temporarily ignored.
  • the display mirror is virtually moved to a position 34 behind the mirror 33.
  • the chief ray to be projected to the lowermost portion of the display screen is referred to as the first light beam, and the traveling path is closer to the optical axis; the chief ray to be projected to the uppermost portion of the display screen is referred to as the second light beam, and the traveling route is obviously
  • the optical axis clamps a large angle of inclination.
  • the first light beam 35, the second light beam 36, and the projection surface of the optical machine 31 upstream of the lens group 32 substantially exhibit a smaller first triangle.
  • the first beam 35', the second beam 36', and the display screen 34 also form a larger second triangle.
  • display screen 34 of the second triangle can be indicated by a dashed line position 34'.
  • the liquid crystal device of the telecentric system is used as the optical device of the spatial modulation device, since the liquid crystal device can only modulate the transmittance of the vertically incident polarized light, the obliquely incident beam will cause light leakage and cannot be effectively effective. Blocking, therefore, it is not possible to use an oblique incident or reflected beam.
  • FIG. 7 when the third beam 45 of the main beam and the fourth beam 46 projecting the main ray at the lower end of the telecentric system illuminator 41 are parallel to each other, even if they enter the lens group 42, they are also aspherical mirrors. 43 is reflected to the display screen 44, but because the optical path of the fourth beam is significantly different from the second beam of Fig.
  • the upstream of the lens group 42 cannot form a triangle, and the downstream beams 45', 46', 44' are formed.
  • the triangles form a similar shape; this makes the telecentric system unsuitable for the above architecture. Therefore, the light beam traveling in the oblique direction used in the structure can only be used with a light machine such as a DLP structure, and cannot be extended to a liquid crystal panel optical machine architecture of a telecentric system.
  • the above orthodontic mirror is limited by its special shape, the position of the mirror center closest to the display screen and the corner position farthest from the display screen, and the vertical distance of the display screen is about ten centimeters, which causes the projector itself.
  • Another object of the present invention is to provide a projector having a sawtooth type mirror which is simple in assembly and easy to assemble by using a sawtooth type mirror.
  • Still another object of the present invention is to provide a projector having a sawtooth type mirror using a sawtooth type mirror to greatly reduce the overall thickness of the projector.
  • a projector with a sawtooth mirror includes: a projector with a sawtooth mirror, comprising: a display screen; a sawtooth type mirror, which should be used in the display; and a light machine, The modulated beam emitted by the light machine is reflected by the saw-type mirror to the display screen.
  • the sawtooth mirror can be set as a plane mirror or a curved mirror.
  • the optomechanist is arranged to have a projection optical axis parallel to the display screen.
  • the sawtooth type mirror includes a 3 ⁇ 4 tooth surface distributed on the base surface and the base surface.
  • the serrated surface is opposite to the base surface and has a plurality of arc-shaped active regions symmetrical from a base point and symmetrical along an axis, wherein each of the arc-shaped active regions has a slanting portion facing the base point, and a back portion An off-axis portion of the base point, a near-display strip adjacent to the oblique portion and the oblique portion, and a distal display strip adjacent to the oblique portion/inclined portion of the adjacent active portion , the height difference between each of the near display strip and the far display strip is much smaller than any of the serrated surfaces Side length.
  • the serrated surface is parallel to the display.
  • the base surface is located away from the display screen than the serrated surface.
  • the sawtooth mirror includes a reflective layer.
  • the reflective layer is coated on the serrated surface toward the inside of the display screen.
  • the reflective layer is coated on the serrated surface toward the outside of the display screen.
  • the invention further includes a primary mirror, the modulated beam emitted by the optical machine, reflected by the primary mirror to the sawtooth mirror on the display.
  • the isotropic portion and the anticline portion of the zigzag mirror have a shape such that an incident angle from incident light of the primary mirror is smaller than a reflection angle reflected from the sawtooth mirror to the display screen.
  • the display element of the optical machine is LCOS, or LCD or DLP.
  • the thickness of the sawtooth type mirror of the present invention is very thin, especially the distance between the near display strip and the far display strip and the display screen of the sawtooth type flat mirror is very small, and the light beam travels through the rear sawtooth type flat mirror to the display screen.
  • the process difference is thus significantly suppressed, and it is not easy to produce positive change, thereby eliminating the need for pre-compensation with barrel distortion, which simplifies the overall assembly structure, reduces manufacturing difficulty and manufacturing cost, and effectively improves yield; and because of the thickness of the mirror Very thin, can greatly reduce the thickness of the overall housing of the projector, so that the product is greatly miniaturized and refined; and can solve the oblique projection, the main beam of the upstream beam of the lens group is parallel to each other, and the main beam of the downstream beam is inclined to each other. Aberrations enable telecentric system optomechanics to be successfully applied to such projectors with an aspherical mirror set that is tilted onto the display.
  • Figure 1 is a schematic view showing the structure of the invention patent of U.S. Patent No. 6,896,375.
  • 2 is a schematic structural view of the display screen of FIG. 1.
  • Fig. 3 is a schematic view showing the structure of the optical machine and the lens unit of Fig. 1 for explaining the angular diffusion effect of the wide-angle lens group.
  • Figure 4 is a schematic view showing the structure of the invention patent of U.S. Patent No. 6,631,994.
  • FIG. 5 is a schematic view showing the deformation state of the pair of optical components of FIG.
  • Figure 6 is a schematic diagram of the structure of Figure 4 corresponding to a non-telecentric system optomechanical machine.
  • Figure 7 is a schematic view of the structure of Figure 4 corresponding to a telecentric system optomechanical machine.
  • Figure 8 is a schematic view showing the structure of a first preferred embodiment of the projector of the present invention.
  • Figure 9 is a front elevational view showing the structure of a second preferred embodiment of the projector of the present invention.
  • Figure 10 is a side elevational view of a sawtooth mirror of the present invention.
  • Figure 11 is a schematic view showing the structure of a sawtooth type mirror of the present invention.
  • Figure 12 is a schematic view showing the reflection mode of the sawtooth type mirror of the present invention.
  • Fig. 13 is a side cross-sectional view showing the first structure of the sawtooth type mirror of the present invention.
  • Figure 14 is a side cross-sectional view showing the second structure of the sawtooth type mirror of the present invention.
  • Figure 15 is a side cross-sectional view showing a third structure of the sawtooth type mirror of the present invention. Detailed ways
  • the structure of the first preferred embodiment of the projector of the present invention as shown in FIG. 8, a display screen 55; a sawtooth type mirror 54 corresponding to the display screen 55; and a light machine 51, the light machine 51
  • the emitted modulated beam is reflected by the sawtooth mirror 54 on the display screen 55.
  • the sawtooth type mirror 54 is provided as a plane mirror.
  • the present invention further includes a primary mirror 53, a modulated beam emitted by the optical machine 51, and the sawtooth is turned by the primary mirror 53.
  • the type mirror 54 is reflected on the display screen 55.
  • the optical machine 51 can be an optical machine such as LCOS, LCD, or DLP, which may be determined by its specific design.
  • the sawtooth type mirror 54 is based on a parabolic mirror, and the flat surface opposite to the paraboloid 540 is a base surface 541, and is perpendicular to the symmetry axis 542 of the paraboloid 540 perpendicular to the base surface 541, and
  • the symmetry axis 542 is aligned with the base point 5420 where the base surface 541 meets, and the paraboloid 540 is cut as shown by the concentric cylindrical faces, for example, by reference numerals 543, 544, forming a plurality of curved faces such as reference numerals 545, 546, 547, etc., and each concentric is omitted.
  • the parallel regions 545', 546', 547' near the base surface 541 cause the curved surfaces 545, 546, 547 to translate toward the base surface 540, forming an arcuate effect as labeled 545", 546", 547" Area.
  • a serrated surface 548 is formed.
  • a reflective layer 549 is plated on the serrated surface 548 and is a protective reflective layer 549 structure with a protective layer disposed in front of it.
  • the near display screens 5450", 5460", 5470 ⁇ are substantially located on the parallel base surface 541.
  • the sawtooth type mirror 54 is substantially planar in this example.
  • the near display screen has 5450", 5460", 5470" and a far display screen that is close to the base surface 541 and away from the display screen.
  • the height difference between 5450', 5460', and 5470' is much smaller than the length of either side of the mirror 54 and the sawtooth surface 548, and the sawtooth type planar mirror 54 has the optical properties of the parabolic mirror, but the overall thickness is greatly increased. Reduced.
  • the sawtooth mirror 54 is disposed in a direction parallel to the display screen 55. If the casing of the projector is substantially rectangular, the display screen 55 and the sawtooth type The mirrors 54 are just assembled in parallel on the front and rear sides of the housing.
  • the light machine 51 is arranged to have a projection optical axis parallel to the display screen 55.
  • the sawtooth surface 548 is parallel to the display screen 55, and the base surface 541 is located at The serrated surface 548 is remote from the display. In this way, assembly is relatively easy and the yield is improved. Moreover, since the sawtooth type flat mirror is very thin, that is, the distance difference between the near display screen and the far display screen and the display screen is very small, and the optical path difference of the beam passing through the rear sawtooth type flat mirror to the display screen is significantly reduced, thereby greatly reducing the The positive distortion is generated, thereby eliminating the need for pre-compensation of the barrel distortion lens, which simplifies the overall assembly structure, reduces manufacturing difficulty and manufacturing cost.
  • the sawtooth type mirror 54 is affected by the structure of the inclined portion and the anticline portion. After the incident light beam from the primary mirror 53 is reflected, it does not follow the angle of reflection equal to the original incident angle, and travels toward the display screen 55. On the contrary, as shown in FIG. 11, when the incident angle ⁇ is 50 to 69 degrees, the reflection angle ⁇ is expanded to 60 to 79 degrees, so that the image data amplification effect is significant, and the distance between the mirror group and the display screen is thereby Can be further shortened.
  • the reflective layer does not have to be disposed on the side of the display screen facing the sawtooth type mirror.
  • the reflective layer 649 is disposed on the sawtooth type mirror 64.
  • the light beam from the optomechanical is reciprocated within the sawtooth mirror 648 and projected onto the display.
  • the sawtooth type mirror 54 is not limited to the above plane mirror, and can also be designed as 14, the convex and concave mirrors 74, 84 shown in Fig. 15, since the convex and concave mirrors 74, 84 are similar to the sawtooth structure of the plane mirror, will not be described here.
  • INDUSTRIAL APPLICABILITY The sawtooth type mirror and the projector having the sawtooth type mirror of the present invention can surely flatten the entire mirror group, reduce the optical path difference caused by the mirror group, and reduce the distortion caused by the optical path difference. Achieving the effect of reducing the cost, making the assembly easier, improving the product yield, reducing the overall thickness of the product, and making the optical machine using the telecentric structure possible, the technology disclosed by the present invention can truly achieve the present invention. The aforementioned purpose.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

Projecteur équipé de miroir à réflexion en dents de scie qui comprend un écran d'affichage (55), un miroir à réflexion en dents de scie (54), et une machine optique (51). Le miroir (54) est opposé à l'écran (55) et le faisceau de lumière modulé émis depuis la machine (51) est réfléchi sur l'écran (55) via le miroir (54). La profondeur du projecteur peut être réduite par l'utilisation du miroir (54).
PCT/CN2007/000471 2006-10-13 2007-02-12 Projecteur équipé de miroir à réflexion en dents de scie WO2008046274A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610063067 2006-10-13
CN200610063067.5 2006-10-13

Publications (1)

Publication Number Publication Date
WO2008046274A1 true WO2008046274A1 (fr) 2008-04-24

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002221611A (ja) * 2001-01-26 2002-08-09 Nippon Tokushu Kogaku Jushi Kk プロジェクション映像表示装置用プリズムシート、シート状光学素子、シート状光学素子の製造方法及びプロジェクション映像表示装置
US20030039030A1 (en) * 2001-08-23 2003-02-27 Myers Kenneth J. Reflective sheets and applications therefor
CN2630899Y (zh) * 2003-08-07 2004-08-04 中强光电股份有限公司 背投影显示装置
CN1716084A (zh) * 2004-06-28 2006-01-04 三星电子株式会社 具有反射镜阵列的反射单元及采用该单元的投影显示系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002221611A (ja) * 2001-01-26 2002-08-09 Nippon Tokushu Kogaku Jushi Kk プロジェクション映像表示装置用プリズムシート、シート状光学素子、シート状光学素子の製造方法及びプロジェクション映像表示装置
US20030039030A1 (en) * 2001-08-23 2003-02-27 Myers Kenneth J. Reflective sheets and applications therefor
CN2630899Y (zh) * 2003-08-07 2004-08-04 中强光电股份有限公司 背投影显示装置
CN1716084A (zh) * 2004-06-28 2006-01-04 三星电子株式会社 具有反射镜阵列的反射单元及采用该单元的投影显示系统

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