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Projection optical system and image projector

A technology of projection optical system and optical system, which is applied in the direction of optics, image communication, TV system components, etc., can solve the problems of increasing dust deposition and unusability

Inactive Publication Date: 2012-05-16
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The ultra-short-throw projector has the advantage that the reporter's shadow does not appear on the projection surface when the reporter makes a report, but it also has the following disadvantages: it cannot be used after a certain distance from the projection surface, so if the projection distance is greater than the total optical system When the length is short, it needs to be embedded in the projection surface
[0006] In these projectors, if the optical system is exposed, problems such as dust deposition are added

Method used

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  • Projection optical system and image projector
  • Projection optical system and image projector
  • Projection optical system and image projector

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0036] figure 1 is to show a ray diagram of the projection optical system according to the first embodiment. figure 2 for figure 1 A partial enlargement of the . exist figure 1 and figure 2 In the coordinate system of , X, Y and Z indicate the major axis direction, the normal direction and the minor axis direction of the screen 90 (projection surface), respectively.

[0037] refer to figure 1 and figure 2 , the projection optical system 10 includes a first optical system 11 , a second optical system 12 and a third optical system 13 .

[0038] In the projection optical system 10, the first optical system 11 is a coaxial optical system including at least one refractive system (lens), and has positive diopter as a whole. In this embodiment, the first optical system 11 is composed of 11 lenses, but is not limited to this structure.

[0039] refer to figure 1 and figure 2 , the second optical system 12 includes a reflective area 12a and a transmissive area 12b, the re...

no. 2 example

[0073] In the first embodiment, the case where the second optical system 12 is planar (flat) is shown. In the second embodiment, a case where the second optical system is bent is shown.

[0074] Figure 9 is to show a ray diagram of the projection optical system according to the second embodiment. Figure 10 for Figure 9 A partial enlargement of the . exist Figure 9 and Figure 10 In the coordinate system of , X, Y and Z indicate the major axis direction, the vertical direction and the minor axis direction of the screen 90, respectively.

[0075] refer to Figure 9 and Figure 10 , projection optical system 20 and projection optical system 10 ( figure 1 and figure 2 ) is that the second optical system 12 is replaced by the second optical system 22.

[0076] The second optical system 22 includes a reflective area 22a and a transmissive area 22b. The second optical system 22 is fixed close to the opening of the housing 70 . The second optical system 22 is bent at ...

no. 3 example

[0088] In the first embodiment, an example in which the second optical system 12 is flat is shown, and in the second embodiment, an example in which the second optical system 22 is curved is shown. In the third embodiment, an example in which the transmissive area is inclined toward the screen in the second embodiment is shown.

[0089] Figure 15 is to show a ray diagram of the projection optical system according to the third embodiment. Figure 16 to show Figure 15 A partial enlarged view of . exist Figure 15 and Figure 16 In the coordinate system of , X, Y and Z indicate the major axis direction, the vertical direction and the minor axis direction of the screen 90, respectively.

[0090] refer to Figure 15 and Figure 16 , projection optical system 30 and projection optical system 20 ( Figure 6 and Figure 10 ) is that the second optical system 32 is used instead of the second optical system 22.

[0091] The second optical system 32 includes a reflective area...

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Abstract

A projection optical system configured to project an image onto a projection surface includes a first optical system including at least one dioptric system and having positive power as a whole; a second optical system including a reflection region and a transmission region; and a third optical system including at least one reflecting surface having power, and having positive power as a whole, wherein light entering the projection optical system passes through the first optical system to have a path thereof bent by the reflection region of the second optical system to be incident on the third optical system, and the light incident on the third optical system has the path thereof bent by the third optical system to pass through the transmission region of the second optical system to be incident on the projection surface.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Japanese Patent Application No. 2010-231951 filed on October 14, 2010, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to a projection optical system and an image projector including the projection optical system. Background technique [0004] Recently, a liquid crystal projector known as an image projector has an integrated high-resolution liquid crystal panel, the brightness of the liquid crystal projector has been improved by a more efficient light source lamp, and the price of the liquid crystal projector has been reduced. In addition, small-sized, light-weight image projectors using digital micromirror devices (DMDs) and the like are widespread, and therefore, image projectors are widely used not only in offices or schools but also in homes. In particular, a small meeting with a small number of people u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00G03B21/14G03B21/28H04N5/74
CPCG03B21/14H04N9/3102G03B21/28
Inventor 高桥达也藤田和弘安部一成
Owner RICOH KK
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