WO2008111591A1 - Système optique de projection, dispositif de projection et dispositif de lecture d'image - Google Patents

Système optique de projection, dispositif de projection et dispositif de lecture d'image Download PDF

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Publication number
WO2008111591A1
WO2008111591A1 PCT/JP2008/054431 JP2008054431W WO2008111591A1 WO 2008111591 A1 WO2008111591 A1 WO 2008111591A1 JP 2008054431 W JP2008054431 W JP 2008054431W WO 2008111591 A1 WO2008111591 A1 WO 2008111591A1
Authority
WO
WIPO (PCT)
Prior art keywords
image display
optical system
lens
display surface
projection
Prior art date
Application number
PCT/JP2008/054431
Other languages
English (en)
Japanese (ja)
Inventor
Osamu Nagase
Yoshitsugu Kono
Original Assignee
Ricoh Optical Industries, Co., Ltd.
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 JP2008013116A external-priority patent/JP5274030B2/ja
Application filed by Ricoh Optical Industries, Co., Ltd. filed Critical Ricoh Optical Industries, Co., Ltd.
Priority to US12/529,920 priority Critical patent/US8419191B2/en
Publication of WO2008111591A1 publication Critical patent/WO2008111591A1/fr

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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
    • G03B21/10—Projectors with built-in or built-on screen
    • 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
    • G02B17/0852—Catadioptric systems having a field corrector only
    • 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 an optical system, a projector apparatus, and a tw image reading apparatus. Background art
  • the optical system used in projectors is an optical system for enlarging and projecting an image displayed on a liquid crystal non-linear type, digital mirror device, etc., on a projection surface. Things are known.
  • n the number of lenses constituting the lens system
  • all of these n lenses may share the optical axis, but the lens optical axes are deviated from each other, and the nl lenses are mutually optical.
  • the positive lens located closest to the image display surface among the positive lenses included in the lens system of the projection optical system described in any one of 1 to 6 above is the refractive index for the e-line of the lens material. : NPe force Condition:
  • the curved mirror with the imaging optical path on the carrying surface side of the optical system described in any one of the forces 1 to 7 described above has an optical axis shared by many lenses in the lens system.
  • a projector device is a projector device equipped with the Si optical system according to any one of the above 1.
  • an image recording apparatus can be configured by adding a recording unit that indicates image information read by the image reading apparatus.
  • the position where the light receiving surface of the image sensor is arranged should be the image display surface, not only the position that fits the image display surface, but also the position equivalent to the image display surface, that is, the connection of the reduction optical system.
  • the image position of the reduction optical system can be any position, and both the image display surface and the image sensor can be provided.
  • the total lens length is almost determined by the F picker and half angle of view.
  • Condition (1) is a condition for ensuring performance and taking the balance of the total length of the optical system that determines the overall size.
  • the change in the image plane and the distortion of the screen outline caused by the image size change are mainly projected on some lenses and all lenses depending on the lens configuration. It can be corrected by moving it according to the change in distance.
  • the lens system of the projection optical system of the present invention also shares a unique optical axis, that is, stable performance can be ensured by not decentering each lens, but the condition (1) must be satisfied. This ensures performance even when the lens is decentered. Further, when the projection optical system of the present invention is used for a front projector, the optical system needs to be a bright optical system so that a portable image can be recognized even in a bright place. By making the numerical aperture on the side larger than 0.25, a bright optical system can be achieved.
  • FIG. 2 is a diagram showing a specific example (Example 1) of the projection optical system in the embodiment of FIG.
  • FIG. 3 is a spot diagram for the 78 inch projection of Example 1.
  • FIG. 5 is a diagram showing another embodiment of the projector apparatus.
  • all lenses share the optical axis in the lens system L.
  • the projection optical system is an off-axis optical system that forms a so-called oblique image.
  • the image displayed on the image display surface IP is magnified as shown in the figure and imaged on the screen surface PS by the image forming action of the lens system L and the reflection mirror EMS of the curved mirror.
  • the 28th surface is a rotating sphere, and the coefficients are as follows.
  • the 29th surface is a rotating 3 ⁇ 4 ⁇ ⁇ aspherical surface, and the coefficients are as follows.
  • FIG. 7 shows a [spot diagram] on the screen surface PS of Example 2.
  • the spot diagram in Fig. 7 shows an image of an LCD panel with an aspect ratio of 4: 3 and a diagonal length of 0.78, and is enlarged on the screen to a diagonal length of 78 inches. is there.
  • the image display surface IP is shifted downward in the figure with respect to the optical axis shared by all the lenses of the lens system L. Therefore, in FIG. 9, the distance between the optical axis of the lens system L and the lower end of the image display surface IP in the figure is «: Y.
  • the second surface is an axial sphere, and the coefficients are as follows.
  • the second 2nd surface is an axial sphere, and the coefficients are as follows.
  • Figure 11 shows a spot diagram on the screen surface PS of Example 3.
  • the spot diagram in Fig. 1 shows an image of the image display surface of a liquid crystal panel with an aspect ratio of 4: 3 and a diagonal length of 0.78 inches, and a diagonal length of 78 inches on the screen. It is the one when enlarged to.
  • the image display surface I P is shifted downward in the figure with respect to the optical axis shared by the lens on the object side of the diaphragm S. Therefore, in FIG. 13, the ⁇ between the optical axis shared by the object-side lens of the diaphragm S and the lower end of the image display surface I P is ⁇ ⁇ : Y.
  • the projection optical system is a so-called off-axis optical system that forms an image of oblique rays. It has become.
  • the image displayed on the image display surface I P is enlarged as shown in the figure and formed on the screen surface P S by the lens system L and the StffiM S imaging function of the curved mirror.
  • the second 2nd surface is an axis and an aspheric surface, and the coefficients are as follows.
  • the second 3rd surface is the axis ⁇ sphere, and the coefficients are as follows is there.
  • the second 4th surface is an axis 3 ⁇ 4 ⁇ sphere, and the coefficients are as follows It is.
  • the second 5th surface is an axis 3 ⁇ 4 ⁇ sphere and the coefficients are as follows:
  • Fig. 15 shows a spot diagram on the screen surface PS of Example 4.
  • the spot diagram in Fig. 15 shows an image of the LCD panel with an aspect ratio of 4: 3 and a diagonal length of 0.78 inches, and is enlarged on the screen to a diagonal length of 100 inches. belongs to.
  • Fig. 16 shows a spot diagram on the screen PS of Example 4.
  • the spot diagram in Figure 16 shows an image on the LCD panel with an aspect ratio of 4: 3 and a diagonal length of 0.7.8 inches, and a diagonal length of 70 inches on the screen. It is a thing when you do.
  • the spot diagram in Fig. 17 shows an image of the image display surface of a liquid crystal nonel with an aspect ratio of 4: 3 and a diagonal length of 0.78 on the screen enlarged to a diagonal length of 50 inches. It is a thing.
  • the surface on the display surface side is in contact with air and has a concave shape on the image display surface side.
  • an aperture stop S is provided between the lens closest to the image display surface and the lens closest to the projection surface.
  • the positive lens located on the “most image display surface side” (j 1) Refractive index at the e-line of the lens material: n Pe force Condition (2) is satisfied, and the mirror surface MS of the curved mirror closest to the projection surface in the imaging optical path is This is an axial plane with the optical axis shared by the largest number of lenses as 3 ⁇ 4.
  • Embodiment 1 Both the 3 ⁇ 4 t optical system of 4 and the like have an aperture stop S from the lens closest to the image display surface to the lens on the most 3 ⁇ 4 surface side in the lens system L, and this aperture stop to the curved mirror
  • the refractive index for the e-line of the lens material n N e satisfies the condition (3). And there is one curved mirror.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

Il est possible de réaliser un nouveau système optique de projection qui peut projeter une image de projection d'une qualité préférable sur un grand écran avec une longueur entière courte par la combinaison d'un système de lentilles et d'un miroir concave. Le système optique agrandit et projette une image affichée sur une surface d'affichage d'image IP sur une surface de projection PS. Le système optique comprend un système de lentilles L ayant une pluralité de lentilles et un ou plusieurs miroirs incurvés. Après émission de lumière du système de lentilles L vers le côté de surface de projection, la lumière vient tout d'abord sur la surface concave de la surface de miroir MS du miroir incurvé. Le système optique satisfait la condition 20 < OAL/Y < 30, où OAL est une distance de la surface d'affichage d'image IP à la surface de miroir incurvé la plus proche du côté de surface de projection le long de l'axe optique partagé par le plus grand nombre de lentilles parmi les axes optiques des lentilles constituant le système de lentilles L, et Y est une distance jusqu'à la partie d'extrémité de surface d'affichage d'image la plus éloignée de l'axe optique partagé par le plus grand nombre de lentilles à l'intérieur de la surface d'affichage d'image IP.
PCT/JP2008/054431 2007-03-07 2008-03-05 Système optique de projection, dispositif de projection et dispositif de lecture d'image WO2008111591A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/529,920 US8419191B2 (en) 2007-03-07 2008-03-05 Projection optical system, projector and image reading device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2007-057526 2007-03-07
JP2007057526 2007-03-07
JP2008013116A JP5274030B2 (ja) 2007-03-07 2008-01-23 投射光学系およびプロジェクタ装置および画像読取装置
JP2008-013116 2008-05-26

Publications (1)

Publication Number Publication Date
WO2008111591A1 true WO2008111591A1 (fr) 2008-09-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/054431 WO2008111591A1 (fr) 2007-03-07 2008-03-05 Système optique de projection, dispositif de projection et dispositif de lecture d'image

Country Status (1)

Country Link
WO (1) WO2008111591A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016057380A (ja) * 2014-09-08 2016-04-21 キヤノン株式会社 読取装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006043666A1 (fr) * 2004-10-21 2006-04-27 Sony Corporation Système optique de projection et affichage d’image de type projection
JP2008116688A (ja) * 2006-11-06 2008-05-22 Sony Corp 投射光学系および投射型画像表示装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006043666A1 (fr) * 2004-10-21 2006-04-27 Sony Corporation Système optique de projection et affichage d’image de type projection
JP2008116688A (ja) * 2006-11-06 2008-05-22 Sony Corp 投射光学系および投射型画像表示装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016057380A (ja) * 2014-09-08 2016-04-21 キヤノン株式会社 読取装置

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