CN101414055A - Projection optical system and image displaying apparatus - Google Patents

Abstract

Disclosed is a projection optical system including a projection surface configured such that an image conjugate to an object is projected, plural optical elements having a refractive power, and a deflecting element having no refractive power configured to deflect an optical path of a light beam and to pass the light beam having a deflected optical path between the plural optical elements, wherein a normal line of the projection surface at a center of the projection surface does not pass through the plural optical elements or between the plural optical elements.

Description

Projection optical system and image display

Technical field

The present invention relates to projection optical system and image display.

Background technology

The known various technology that are used for projection optical system and image display that disclose.For example, Japanese Unexamined Patent Publication No 2001-255462 (JP-A-2001-255462) discloses a projection optical system, be used for light beam is directed to from image display panel on the screen that tilts with respect to axis of reference to form image information at this screen, wherein this projection optical system comprises reflective optics, it contains the asymmetric reflecting surface of a plurality of rotations with curvature, and from the light beam of the asymmetric reflecting surface reflection of these a plurality of rotations, light is directed on the described screen from described image display panel; And be provided between the asymmetric reflecting surface of described a plurality of rotations of described reflective optics or the diaphragm between described reflective optics and described image display panel, wherein said diaphragm is set to the magnification imaging of optical component to bear by the screen side that is positioned at described diaphragm, or the like.

Particularly, thereby comprise the reflection that from the downside to the upside, makes progress in turn of six free-form surface mirror, form intermediary image, carry out the reflection of concave mirror then, it is open in Fig. 1 of JP-A-2001-255462 finally to project the projection optical system of screen with oblique incidence.

Yet disclosed projection optical system may fold and make device height to fold the big problem of change because its light path is provided in the catoptron of vertical direction among Fig. 1 of JP-A-2001-255462.

Simultaneously, Japanese Unexamined Patent Publication No 2006-235516 (JP-A-2006-235516) openly is used to be amplified in the image on the conjugate plane of reduced side among a pair of conjugate plane and makes the projection optical system of its imaging on the conjugate plane of Zoom Side, wherein first imaging system and second imaging system begin to arrange in turn from the conjugate plane side in reduced side, wherein first imaging system comprises that a plurality of lens and second imaging system comprise the concave mirror with aspheric surface form, and the position that optical system is set between first imaging system and second imaging system forms intermediate image etc.

Particularly, form intermediate image, on concave mirror, reflect then, and the projection optical system that finally projects on the screen by oblique incidence discloses in Fig. 1 of JP-2006-235516 by dioptric system.

Yet though because the prominent part to the Projection Display side of the concave mirror of disclosed projection optical system among Fig. 1 of JP-A2006235516 (lens in Fig. 1 above), it has downward protuberance, therefore has the big problem of device height.

Simultaneously, Japanese Unexamined Patent Publication No 2004-309765 (JP-A-2004-309765) openly comprises a plurality of catoptric imaging optics systems with optical reflection surface of curvature, gap between a pair of optical reflection surface that the light beam that wherein enters passes through when entering reflective optics is same as the gap between a pair of optical reflection surface that the light beam that withdraws from passes through when withdrawing from.

Particularly, obtain intermediate image, and amplify the optical system of projection by concave mirror open in Fig. 2 of JP-A2004-309765 by dioptric system and mirror system.More particularly, projected image is that light path is after passing through dioptric system, by the optical reflection surface (in the paragraph [0027] of JP-A-2004-309765, being described as having the asymmetric surface of rotation of curvature) that the four sides forms, in reflective optics inside, pass repeatedly and form.Equally, the optical system with three surfaces is open in Fig. 5 of JP-A2004-309765.The reflecting surface of disclosed optical system is to have the optical reflection surface of focal power and have intended shape based on the design of projection optical system in the Fig. 2 of JP-A-2004-309765 and each of Fig. 5.

Yet the reflective optics in the Fig. 2 of JP-A-2004-309765 and each of Fig. 5 in the disclosed optical system has towards protuberance so that equipment to the side (downside) opposite with projection side (upside) and has projection bottom and correspondingly big.

In addition, because the final surface of imaging optical system all has focal power in the disclosed optical system of Fig. 2 of JP-A2004-309765 and Fig. 5, so it must be arranged according to its desired design value with respect to the position on another optical reflection surface.Here, may by tilt or mobile optical element control projecting direction but the mobile meeting with optical element of focal power causes the optical degradation of projection.That is to say, will be difficult to keep the projection performance.Expected angle is set if desired, the whole optical system of then essential redesign.If the optical reflection surface as final surface is replaced by the level crossing that does not have focal power basically, the shape of other optical elements is optimized and is designed once more so that guarantee to throw performance, and the size of the optical system for example height and the distance between the basal surface of the launching position of maximum height and optical system of whole optical system can not reduce.

Simultaneously, be installed in the projector of back and the optical system that comprises first optical system and second optical system open in Fig. 1 of Japanese Unexamined Patent Publication No 2007-212748 (JP-A-2007-212748) and Fig. 2.

Particularly, the light that reflects from the concave mirror that constitutes second optical system is folded the formula mirror reflects, cross the light beam that passes through between first optical system and second optical system, and the structure that is projected onto on the screen is open in Fig. 2 of JP-A-2007-212748.First reflecting surface of first optical system and second optical system (for example, the concave mirror among Fig. 2) is arranged is placed on its center between them into the normal with the plane of delineation (for example, screen).That is to say that the normal of the plane of delineation (for example, screen) is that center first optical system is separated setting with second optical system.

Such structure causes the projection optical system of size greater than the longitudinal size that is reflected in the projected image on the screen.In addition, if the relation of the position between first optical system and second optical system does not remain on the position relation of expectation, then imaging performance may reduce.That is to say, specifically apply under the situation of front projector that owing to be used to support concave mirror to keep its member with the position relation of first optical system big, the practicality of projection system is relatively poor specifically at it.In addition, even after it applies to the back, may realize that thickness reduces in the projection process, the problem that the projector size increases is also arranged because the space that the light of advancing occupies is big the inside of optical system because first optical system is separated from second optical system.

The inventor has imagined the thought of the more small-sized projection optical system of outfit.

The inventor has also imagined the thought that is equipped with the image display that comprises more small-sized projection optical system.

Summary of the invention

According to one aspect of the invention, a kind of projection optical system is provided, comprise the projection surface that is configured to throw with the picture of object conjugate, a plurality of optical elements with refractive power, and do not have the light path that is set to deflected beam of refractive power and the deflecting element of the light beam that between a plurality of optical elements, is deflected by light path, wherein projection surface is between the normal at projection surface center is by a plurality of optical elements or a plurality of optical element.

According to a further aspect of the present invention, provide an image display, comprise the image projection that is set to generate the video generation device of image and is set to be generated by video generation device to display surface or be presented at image projection and display device on the display surface, wherein image projection and display device comprise projection optical system as mentioned above.

Description of drawings

Figure 1A and Figure 1B are that diagram is as the imaging beam in the projection optical equipment of the example more specifically of embodiments of the invention and the figure of projected light beam;

Fig. 2 is the diagram figure of the structure of the projection optical equipment of example 1 according to an embodiment of the invention;

Fig. 3 is the diagram figure of the effect of the projection optical system of example 1 according to an embodiment of the invention;

Fig. 4 is the diagram figure of the structure of the projection optical equipment of example 2 according to an embodiment of the invention;

Fig. 5 is the diagram figure of the structure of the projection optical equipment of example 3 according to an embodiment of the invention;

Fig. 6 A and Fig. 6 B are the diagram figure of the structure of the display device of example 4 according to an embodiment of the invention;

Fig. 7 is the diagram figure of the structure of the projection optical equipment of example 5 according to an embodiment of the invention;

Fig. 8 A, Fig. 8 B and Fig. 8 C are the diagram figure of projection optical equipment's structure of example 6 according to an embodiment of the invention.

Embodiment

Next, some embodiment of the present invention will be described with reference to the accompanying drawings.

First embodiment of the invention is to comprise a plurality ofly having the optical element of refractive power and will projecting projection optical system in the projection surface with the picture of object conjugate, the deflecting element that the light path that wherein said projection optical system comprises not to be had refractive power and make light beam is deflected, the light beam that light path is deflected passes through described a plurality of optical elements, and between the normal of the described projection surface at the center of described projection surface is by described a plurality of optical elements or described a plurality of optical element.

Have refractive power (focal power) here, and be meant that described a plurality of optical element has positive refractive power or negative refractive power separately.In addition, each of a plurality of optical elements is restriction particularly not, can be the optical element of transmitted light, and for example lens perhaps can be catoptrical optical element, for example catoptron.In addition, be projected onto surface on it if described projection surface is a picture with object conjugate, then restriction particularly can be plane surface or curved surface, and can maybe can be not included in the described projection optical system.

Because between the normal of the projection surface at projection surface center is by a plurality of optical elements or a plurality of optical element, does not pass through the optical element of any formation projection optical system and between optical element, do not pass through so it can be expressed as normal in the projection surface at projection surface center.That is to say that the normal that structure is provided as in the projection surface at projection surface center does not pass projection optical system.

In addition, when between the normal of the projection surface at projection surface center is by a plurality of optical elements or a plurality of optical element, and observe the projected image that is presented in the projection surface from the projection optical system side of arranging, exist projected image not to be projected the observation place that optical system self hides.

In addition, the vector of arbitrfary point and fully or the point that is substantially zero on the center of projection surface is meant from the center of projection surface to projection surface.

In addition, when between the normal of the projection surface at projection surface center is by a plurality of optical elements or a plurality of optical element, between projection surface's normal of light beam principal ray incidence point can be by a plurality of optical elements or a plurality of optical element.In addition, the chief ray of light beam refers to the light by the aperture diaphragm center that allows to be arranged on projection optical system.

In addition, the light beam that its light path is deflected passes through between a plurality of optical elements, mean, its light path is deflected the element light beams deflected, by the section of first optical system at the intersection point of the optical axis of the surface of first optical element and first optical element, and second optical element of the most close first optical element is in the space of second optical element between the section of the intersection point of the optical axis of the surface of the first optical element side and second optical element.

In addition, there is not the deflecting element of refractive power can comprise that refractive power is entirely zero deflecting element, or its refractive power deflecting element of being considered to be substantially zero.The deflecting element that is considered to be substantially zero for its refractive power is, for example, the design load of its refractive power is zero deflecting element, but it has the refractive power error of the foozle of resulting from.

Particularly, it is the surface that can not help the optical design of projection optical system, and refers to, for example, and level crossing or parallel plate.Parallel plate depends on its thickness, may influence imaging performance, but is equivalent to not have the element of focal power.Usually, depend on the tolerance range of foozle, parallel plate may have the several millimeters for bad situation, up to thousands of millimeters radius-of-curvature for good situation.Speak by the book, it has curvature like this, if but not influence of imaging performance, then it is represented as does not have refractive power.

If deflecting element be configured such that light beam that light path is deflected between a plurality of optical elements by and do not have the element on refractive power ground, then specifically restriction for example, can be level crossing or for example Fresnel type (Fresnel) catoptron as mentioned above.In addition, deflection mirror can be from the separable element of projection optical system.Its reflectivity can be controlled to control reflection light quantity.Be used to separate the structure of projection light, for example the half-reflecting mirror structure can be included in the scope of embodiments of the invention.

According to first embodiment of the invention, may be equipped with more small-sized projection optical system.

The second embodiment of the present invention is the projection optical system according to first embodiment of the invention, and wherein deflecting element is provided as the light beam that its light path is deflected and has with the light beam by described a plurality of optical elements overlapping.

Here, have and the light beam that is deflected through its overlapping light path of the light beam of a plurality of optical elements, mean at least a portion that its light path is deflected the element light beams deflected and intersect with light beam that (overlapping by) passes through a plurality of optical elements.

According to second embodiment of the invention, may be equipped with more small-sized projection optical system.

Example more specifically as of the present invention first or second embodiment, provide projection optical equipment, it a plurality ofly has the optical element of focal power and does not have the projection optical system that is arranged on the deflecting element in the projecting light path from the projection optical system to the projected image of focal power to form basically by comprising, wherein the light path from the projected light beam of projection optical system outgoing is deflected element deflection, and it crosses the imaging beam by the optical element with focal power then.

Here, projected light beam that is to say from the projection optical system outgoing, has the Ray Of Light that the final surface of focal power is withdrawed from from the projection optical system that comprises a plurality of optical elements with focal power.Imaging beam is the imaging beam through optical element, that is to say the light beam that passes through in the light path on the final surface with focal power at the first surface that has focal power from projection optical system.

In such projection optical equipment, the size that can be prevented projection optical equipment increases and obtains small-sized optical system.More specifically, because projection light and light beam in the projection optical system are intersected, so may utilize the space of occupying efficiently and realize the miniaturization of optical projection system by deflecting element.In addition, back projection optical system also can realize small-sized equipment.In addition, can solve in the Fig. 2 as JP-A-2007-212748 in the disclosed conventional art, the height of projection optical system is greater than screen size, correspondingly, and the problem that the space that is occupied by optical projection system increases.

In addition, about front projector, may realize small-sized projector and lower its projector space.

Figure 1A and Figure 1B are that diagram is as the imaging beam in the projection optical equipment of the example more specifically of embodiments of the invention and the figure of projected light beam.Figure 1A is the figure of diagram imaging beam, and Figure 1B is the figure of diagram projected light beam.

In Figure 1A and Figure 1B, projection optical equipment 100 comprises first optical system 101 and second optical system 102.Yet, be included in as the deflecting element in the projection optical equipment of the example more specifically of embodiments of the invention and in Figure 1A or Figure 1B, show.In projection optical equipment 100, from the light beam of the light of object 103 outgoing through first optical system 101 and by final surperficial 104 reflections second optical system 102 so that do not having to form projected image 105 under the deflecting element situation with focal power.Here, shown in Figure 1A.Imaging beam 106 is the light beams that have final surperficial 104 optical element of focal power through the first surface that has focal power in first optical system 101 in second optical system 102, shown in Figure 1B, projected light beam 107 is the light beams that have final surperficial 104 outgoing of focal power from second optical system 102.In addition, if object is provided in the Zoom Side, then the plane of delineation is provided in reduced side, and projected light beam refers among Figure 1A and Figure 1B the light beam from object 103 to first optical systems 101.

The third embodiment of the present invention is according to of the present invention first or the projection optical system of second embodiment, wherein a plurality of optical elements comprise having positive refractive power, and first optical system of the intermediary image of formation and object conjugate, and comprise at least one optical element, and second optical system of the picture of formation and intermediary image conjugation.

Can be same as or be different among of the present invention first or second embodiment picture with object conjugate with the picture of intermediary image conjugation here.

A third embodiment in accordance with the invention can provide the more small-sized projection optical system that comprises more small-sized deflecting element.

As third embodiment of the invention example more specifically, provide projection optical equipment, the projection optical system of the example more specifically of wherein of the present invention first or second embodiment is made up of first optical system with positive focal power and second optical system, form intermediary image by first optical system, carry out reimaging by second optical system then.

In such projection optical equipment, can make the deflecting element miniaturization to reduce the size of equipment.More particularly, may obtain to allow to make the optical system of the projection light ray boundling that projection optical system sends.More specifically, because use the optical system that forms intermediary image, second optical system has the position corresponding to so-called " diaphragm " of light in its convergence, and deflecting element is arranged near it, can reduce the size of deflecting element.Simultaneously, can reduce the size of projection optical equipment.

The fourth embodiment of the present invention is the projection optical system according to third embodiment of the invention, and wherein said at least one optical element comprises the reflective optical devices with positive refractive power.

Here, if reflective optical devices is reflected light and the optical element with positive refractive power, then its not restriction particularly for example, can be sphere concave mirror and aspheric surface concave mirror.In addition, for non-spherical surface, for example, can be rotational symmetric non-spherical surface and rotation asymmetric non-spherical surface, for example Bian Xing non-spherical surface and free-form surface.

A fourth embodiment in accordance with the invention may be equipped with the more small-sized projection optical system that comprises more small-sized deflecting element.

As the example more specifically of fourth embodiment of the invention, provide projection optical equipment as the example more specifically of third embodiment of the invention, wherein second optical system is made up of the catoptron that has positive focal power at least.

In such projection optical equipment, can make the deflecting element miniaturization to reduce the size of equipment.More particularly, can obtain to make the optical system of the projection light ray boundling that projection optical system sends.More specifically, because use to form the optical system of intermediary image, be equivalent to so-called " diaphragm ", light is provided in second optical system in the position of its convergence, and deflecting element is arranged near it, can reduce the size of deflecting element whereby.Simultaneously, can reduce the size of projection optical equipment.

The fifth embodiment of the present invention is the projection optical system according to fourth embodiment of the invention, and wherein reflective optical devices is the optical element of the picture of the most approaching and intermediary image conjugation at least one optical element.

According to fifth embodiment of the invention, more small-sized projection optical system can be provided, wherein the light path that reflexes to the light of deflecting element from reflective optical devices reduces further with respect to the angle of the light path that is incident on the light on the reflective optical devices.

Example more specifically as fifth embodiment of the invention, provide the projection optical equipment as the example more specifically of fourth embodiment of the invention, the catoptron that wherein has positive focal power is arranged in the final surface of second optical system in the projected image side.

In such projection optical equipment, second optical system has reflection function, may increase deflection angle whereby, so that be directed to deflecting element, and to realize more small-sized optical system.More specifically,, therefore in second optical system, have light corresponding to so-called " diaphragm ",, can reduce the size of deflecting element by in its vicinity with the deflecting element setting in the position of its convergence because use to form the optical system of intermediary image.Simultaneously, can reduce the size of projection optical equipment.Particularly, when second optical system is made up of catoptron, collapsible light path, and can utilize the space of projecting light path more efficiently by deflecting element.

Sixth embodiment of the invention is the projection optical system of the 4th or the 5th embodiment according to the present invention, and wherein deflecting element light beam that its light path is deflected passes through between first optical system and reflective optical devices.

Here, the light beam meaning that its light path of passing through between first optical system and reflective optical devices is deflected refers to that its light path is deflected the element light beams deflected by a space, this space is arranged in first optical system section of the intersection point of the optical axis of the surface of first optical element of close reflective optical devices and first optical element, and between the section of the intersection point of the optical axis of the surface of the first optical element side of reflective optical devices and reflective optical devices.

According to sixth embodiment of the invention, may be equipped with more small-sized projection optical system, comprise the deflecting element that is provided as more close reflective optical devices.

Example more specifically as the sixth embodiment of the present invention, provide projection optical equipment as the example more specifically of the of the present invention the 4th or the 5th embodiment, wherein projecting light path is by optical path-deflecting element deflection as mentioned above, then with in first optical system with constitute the imaging beam that passes through between the catoptron of the positive focal power of having of second optical system and intersect.

In such projection optical equipment, second optical system has reflection function, may increase deflection angle whereby, so that be directed to deflecting element, and to realize more small-sized optical system.More specifically, because use to form the optical system of intermediary image, have light corresponding to so-called " diaphragm " in the position of its convergence in second optical system, deflecting element is arranged near it, can reduce the size of deflecting element thus.Simultaneously, can reduce the size of projection optical equipment.Particularly, when second optical system is made up of catoptron, collapsible light path, and can be used for the space of projecting light path further more efficiently by deflecting element.

Seventh embodiment of the invention is the arbitrary projection optical system according to first to the 6th embodiment of the present invention, and wherein projection optical system comprises the unit that is used to regulate the deflecting element setting further.

Here, as being used to regulate the unit that deflecting element is arranged, can be for example, to be used to change the unit (unit that is used for mobile deflecting element) of deflecting element position and to be used to change the unit (being used to rotate the unit of deflecting element) that the deflecting element direction disposes.The unit that is used for mobile deflecting element is restriction particularly, for example, can be to be used for moving the driving mechanism of deflecting element and for the driving mechanism that moves deflecting element by means of arm along guide rail.Equally, being used to rotate the restriction particularly of unit of deflecting element, for example, can be the driving mechanism that is used to make into a sideway swivel deflecting element of the deflecting element of rotation axis.

According to seventh embodiment of the invention, can be equipped with the projection optical system that to regulate by the light path of deflecting element light beams deflected.

As the example more specifically of the seventh embodiment of the present invention, be the projection optical equipment of arbitrary example more specifically of first to the 6th embodiment of the present invention, wherein the position of projected image can be adjusted by adjusting the position of shifting deflecting element.

In such projection optical equipment, can obtain easy correction, for example by the mechanism of the caused image inclination of inclination of equipment.More specifically,, can obtain and can easily revise by means of the adjustment of deflecting element position or the adjustment of its angle because deflecting element does not have focal power, for example, the mechanism of the inclination of projected image.

The eighth embodiment of the present invention is the projection optical system according to seventh embodiment of the invention, and the unit that wherein is used to regulate the deflecting element position comprises the unit that is used for mobile deflecting element.

According to the eighth embodiment of the present invention, can obtain more small-sized projection optical system by mobile deflecting element.

Ninth embodiment of the invention is the arbitrary projection optical system of first to the 8th embodiment according to the present invention, and wherein projection optical system comprises the unit of arranging that is used to regulate at least one optical element further.

Here, as the unit of arranging that is used to regulate at least one optical element, for example can be, ((unit that is used for moving at least one optical element () unit one of at least) and is used to change the direction configuration of at least one optical element (be used to rotate at least one optical element () unit one of at least) in the unit of) position one of at least to be used to change at least one optical element.

Be used for moving (the not restriction particularly of) unit one of at least of at least one optical element, and for example, be equipped with and be used for moving at least one optical element () driving mechanism and be used for moving at least one optical element () driving mechanism one of at least one of at least by means of arm along guide rail.Equally, be used to rotate (the not restriction particularly of) unit one of at least of at least one optical element, and for example, be equipped with and be used to wind that () optical axis axle rotates at least one optical element () driver element one of at least as rotation axis one of at least perpendicular at least one optical element.

According to the ninth embodiment of the present invention, may be equipped with can be by regulating the projection optical system that arranging of at least one optical element makes that it is more small-sized.

Tenth embodiment of the invention is the projection optical system according to ninth embodiment of the invention, and the unit of arranging that wherein is used to regulate at least one optical element is the unit that is used for moving at least one optical element.According to tenth embodiment of the invention, may be equipped with and to make the projection optical system that it is more small-sized by moving at least one optical element.

As the present invention the 8th, the example more specifically of the 9th or the tenth embodiment, provide projection optical equipment, wherein constitute the optical element of second optical system and deflecting element is arbitrary or both are movable to the first optical system side in non-projection as arbitrary example more specifically of first to the 7th embodiment of the present invention.

In such projection optical equipment, can improve for example portable function, need it to be applied to of front type particularly.More specifically, deflecting element or the element that constitutes second optical system are movably in non-projection, be applicable under the situation of front projection, can when taking in, realize miniaturization whereby, be used for taking in efficiently or placement space and the projection optical equipment that improves portable devices thereby can provide to have.

The 11st embodiment of the present invention is the arbitrary projection optical system of first to the tenth embodiment according to the present invention, and wherein projection optical system is to be used for the picture with object conjugate is projected projection optical system in the projection surface of a plurality of optical elements below.

Here, the projection surface below a plurality of optical elements is meant the projection of each optical axis below that is positioned at a plurality of optical elements.

According to eleventh embodiment of the invention, can be equipped with projection optical system, wherein can reduce and may be used for the dust and dirt that deflection deposits on the deflecting element of the light path of the light beam of the projection surface below a plurality of optical elements.

As the example more specifically of eleventh embodiment of the invention, provide projection optical equipment as arbitrary example more specifically of the present invention first to the tenth embodiment, wherein projection optical equipment throws display image from upside to downside.

In such projection optical equipment, can be equipped with the optical projection system that it is easily prevented the dust and dirt deposition on the reflector elements.More specifically, because the surperficial of catoptron as deflecting element can be orientated downwards, even therefore long-time use, the dust of deposition or dirt amount are also very little, thereby can prevent the degeneration of projection quality.Simultaneously, can prevent the thermal absorption of dust or dirt, therefore can prevent from as far as possible to reduce by the caused minute surface reliability of heat.

The 12nd embodiment of the present invention is an image display, it comprise the video generation device that generates image and the image projection that will generate by video generation device to and be presented at image projection display device in the projection surface, wherein the image projection display device comprises the arbitrary described projection optical system as the present invention the first to the 11 embodiment.

The projection surface here can be same as the projection surface in arbitrary projection optical system of the present invention the first to the 11 embodiment.

According to the 12nd embodiment of the present invention, can provide the image display that comprises more small-sized projection optical system.Correspondingly, also can provide more compact image display device.

As the example more specifically of the 12nd embodiment of the present invention, provide the display device formed by image generation unit at least and constitute projection and show the projection optical equipment that is formed on the image on the image generation unit as the first to the 11 embodiment of the present invention arbitrary.

In display device, can reduce the height of projector apparatus and reduce equipment volume.More specifically, projection light intersects with light beam in the projection optical system by deflecting element, can utilize the space of occupying whereby efficiently and realize the miniaturization of optical projection system.Particularly, about the back projection optical system, can realize small-sized equipment.Simultaneously, about front projector, may reduce its projector space.Therefore, can reduce the height and the minimizing equipment volume of projector apparatus.

The 13rd embodiment of the present invention is the image display according to twelveth embodiment of the invention, and wherein image display is preceding projection-type image display.

According to the 13rd embodiment of the present invention, projection-type image display before can providing comprises more small-sized projection optical system.

For the example more specifically of thriteenth embodiment of the invention, provide display device as the example more specifically of twelveth embodiment of the invention, wherein display device is preceding projection-type (a preceding type).

In such display device, before being applied to, it under situation of porjection type, can provide display device especially with littler equipment size.

Next, some example will be illustrated with reference to the accompanying drawings according to an embodiment of the invention.

(example 1)

Fig. 2 is the diagram figure of the structure of the projection optical equipment of example 1 according to an embodiment of the invention.Fig. 3 is the diagram figure of the effect of the projection optical equipment of example 1 according to an embodiment of the invention.Fig. 3 (a) is the diagram figure of the projection optical equipment of example 1 according to an embodiment of the invention; Fig. 3 (b) is another part of this Fig. 3, the example of the projection optical equipment of this part diagram prior art.

Projection optical equipment 200 shown in Figure 2 comprises object, is used to amplify and throw the projection optical system of object information, and optical path-deflecting element 203.

Here, projection optical system is made up of first optical system 201 and second optical system 202, the optical system be made up of a plurality of optical elements with focal power of first optical system 201 wherein, second optical system 202 is made up of the single optical element with focal power.First optical system 201 and second optical system 202 are by integrally and optimization ground design.First optical system 201 of expression is a dioptric system, and second optical system 202 is reflective opticss.

In addition, Fig. 2 is the synoptic diagram of projection optical equipment.In order to obtain, for example, the imaging performance of first optical system, 201 expectations, usually, it be by the composite construction of a plurality of lens and be optimized by means of the lens design simulation of using traditionally.For example, preferably first optical system 201 is made up of a plurality of refractors.For better lens arrangement, provide " just-just-negative " structure, it fully has second lens combination or the lens 2012 of positive light coke by first lens combination that fully has positive light coke or lens 2011, and the 3rd lens combination or lens 2013 compositions that fully have negative power.Yet described lens combination is omitted in the drawings.Certainly, first optical system 201 can be mirror-optical system or can be the combination of lens and catoptron.In Fig. 2, but first optical system 201 is schematically depicted as three refraction optical elements is not limited to by three refraction optical elements or the optical system formed.

Second optical system 202 is made up of concave mirror.Concave mirror has positive light coke inherently, is better therefore.Certainly, it can be made up of a plurality of catoptrons, so that obtain the imaging performance of expectation, perhaps dioptric system can be added.The special shape of concave mirror be better rotational symmetric aspherical shape and better be free-form surface mirror shape with higher degree of freedom.For example, described free-form surface mirror is that its curvature in directions X and Y direction is different from XY polynomial surface each other better, and wherein the Z axle is an optical axis direction, and X-axis is in horizontal direction, and Y-axis is in vertical direction.

In addition, optical path-deflecting element 203 is arranged on from the projection optical system of being made up of first optical system 201 and second optical system 202 and arrives the projecting light path of projected image 205.In example 1 of the present invention, optical path-deflecting element 203 is and the level crossing of the optical axis parallel arrangement of first optical system 201, still, certainly, is not limited to level crossing.Optical path-deflecting element 203 also can be the Fresnel-type deflecting element that does not have lens convergence function (not having focal power).The size of optical path-deflecting element 203 is less than the size of second optical system 202.Because second optical system 202 has positive light coke, so as in index path shown in Figure 2, represent, can be set to make light beam to assemble less than the optical path-deflecting element 203 of second optical system 202 to optical path-deflecting element 203.

As shown in Figure 2, from object emission and the imaging beam 206 of the optical element by constituting first optical system 201 be projected second optical system, 202 reflections the optical device 200.Here, if projection optical equipment 200 does not comprise optical path-deflecting element 203, the light that reflects from second optical system 202 will form projected image 204 under the situation that is not equipped with the optical path-deflecting catoptron.Yet, from the light path of the light of second optical system 202 reflection by optical path-deflecting element 203 deflections the projection optical equipment 200 of example 1 of the present invention.The projection optical system radiation, its light path is not being had for first optical system 201 provides under the situation of optical path-deflecting element by the projected light beam 207 of optical path-deflecting element 203 deflections, at the opposite side formation projected image 205 of projected image 204.

In addition, example 1 of the present invention is that wherein intermediary image is formed the projection optical system of being amplified and being throwed by second optical system 202 then by first optical system 201.Information on the object plane is amplified to form intermediary image a little by first optical system 201.Intermediary image is amplified and projection by second optical system 202.The position of the intermediary image that forms does not show that in the drawings it is provided between first optical system 201 and second optical system 202.If overall optical system is optimized to obtain the imaging performance of expectation in the position of projected image, the imaging performance of intermediary image self is out of question.In such optical system, optical path-deflecting element 203 is arranged between the position from the projection optical system to the projection.Then, the light path of projected light beam is intersected by the imaging beam 206 in the inner light path of the projected light beam 207 of optical path-deflecting element 203 deflections and deflection and projection optical system and is throwed.In addition, intermediary image is formed in the projection optical system, but intermediary image must not need.In addition, as long as the enough spaces that keep projected light beam 207 to pass through, intermediary image can be arranged in projection optical system Anywhere.Can guarantee the space that projected light beam 207 passes through by means of the lens design of using traditionally.

In addition, as shown in Figure 2, screen is arranged so that the normal 209 through the center 208 of projected image 205 does not intersect with projection optical system (space between arbitrary optical element or the optical element).That is to say that both are arranged in the same side of normal 209 to constitute first optical system 201 of projection optical system and second optical system 202.

As being described more specifically below, projector has first end 210 and second end 2101 in vertical direction, and wherein the both is arranged in a side of normal 209 and with respect to the opposite side of normal 209 at the end 211 of projected position.

By such relation of arranging, keep enough viewing areas of projected image 205.

As shown in Figure 2, does not interrupt in observer 220 the visual field.At least observer 220 position in vertical direction shown in Figure 2 without limits,.This almost can not be realized by the structure as disclosed conventional art in JP-A-2007-212748.

Like this, in example 1 of the present invention, the normal that provides through the projected image center does not intersect with projection optical system (space between the arbitrary or optical element of optical element), and optical path-deflecting element 203 be arranged so that optical projection system for example the imaging beam 206 of projected light beam 207 and the projection optical system inside light path of the light of collector lens radiation intersect, promptly, the structure of being throwed with the optical projection system inner space, its be example 1 of the present invention new structure, open by prior art.

Simultaneously, although the prior art that has a plurality of light paths to be folded and to cross one another, such folding element self is paid the optical element that Performance of Optical System is arranged, and the optical path-deflecting element 203 of example 1 of the present invention is the deflecting element that does not have focal power basically, for example, level crossing.Like this, because optical path-deflecting element 203 does not have focal power, thereby the position that the performance of the projection optical system of finishing does not have influence and can change optical path-deflecting element 203 to a certain extent freely is provided with the position of the expectation of projected image.Simultaneously, can rotate optical path-deflecting element 203 to a certain extent.As in Fig. 2, being clear that, do not hinder mutually with projected light beam 207 and projector to be as the criterion.

By the use of such structure, the space that can utilize the space (satisfying the space of lens performance needs) of the needed expectation of imaging to occupy as projected light beam 207 can utilize the space that is occupied by imaging system from the object to the plane of delineation efficiently.Because have such feature, so the viewing area of projected image can be on a large scale.Equipment miniaturization like this, and be applicable to the optical system of front projector type.

As shown in Figure 3, total system slave unit lower end is reduced to h for the structure of example 1 of the present invention to the height of projected position upper end from the H for conventional art.Equally, the height for equipment began from its end needs although H ' is a conventional art, and the most equipment of example 1 of the present invention has the h of being equal to or less than ', realizes miniaturization more.

(example 2)

Fig. 4 is the diagram figure of the structure of the projection optical equipment of example 2 according to an embodiment of the invention.

Projection optical equipment 400 shown in Figure 4 comprises object 404, is used to amplify the projection optical system of projection object 404, and deflecting element 403.

Here, projection optical system is made up of first optical system 401 and second optical system 402, the optical system formed by a plurality of optical elements of first optical system 401 wherein with focal power, and second optical system 402 is reflective opticss.Equally, first optical system 401 and second optical system 402 relate generally to obtain the imaging performance of expectation.Better example is constructed to first optical system 401 and is made up of a plurality of refractors.On the other hand, second optical system 402 is made up of concave mirror.Correspondingly, second optical system 402 has positive light coke and optical path-deflecting function simultaneously.In addition, deflecting element 403 is arranged in from the projection optical system be made up of first optical system 401 and second optical system 402 to the projecting light path of the position of projected image 405.

As shown in Figure 4, in projection optical equipment 400, object 404 for example light valve etc. send and through the imaging beam 406 of the optical element that constitutes first optical system 401 by 402 reflections of second optical system.Here, in the projection optical equipment 400 of example 1 of the present invention, from optical routing deflecting element 403 deflections of the light of second optical system 402 reflection.The projection optical system outgoing also forms projected image 405 by the projected light beam 407 of deflecting element 403 deflection optical paths on the display position of screen etc.

In addition, intermediary image is formed between first optical system 401 and second optical system 402 in the example 2 of the present invention.Projection optical system in the example 2 of the present invention is to form intermediary image is amplified projection then by second optical system 402 projection optical system by first optical system 401.Information on the object plane is amplified to form intermediary image a little by first optical system 401.Intermediary image is amplified and projection by second optical system 402.If the imaging performance of expectation is fully obtained, then the imaging performance of intermediary image is out of question.In such optical system, deflecting element 403 is arranged between projection optical system and the projected position with the projected light beam 407 of deflection projected light beam 407 and deflection and is intersected (reporting to the leadship after accomplishing a task regional 409) by projection with the imaging beam 406 with projection optical system inside.In example 2 of the present invention, optical path-deflecting element 403 is and the level crossing of the optical axis parallel arrangement of first optical system 401, still, certainly, is not limited to level crossing.In addition, deflecting element 403 has the Fresnel-type deflecting element of lens convergence function (and not having focal power).

As shown in Figure 4, to the normal 4101 of screen at the center 410 of projected image 405, the height 4111 of the lower end 411 of the projected image 405 of close projector, and the height 4121 of the upper end of close projected image of projector defines, and X, Y and Z axle are defined as to X-axis and are in horizontal direction and Y-axis is in vertical direction.The normal 4101 of screen at the center 410 of projected image 405 is set to not and projection optical system (space between arbitrary optical element or the optical element that is to say, first optical system, 401, the second optical systems 402, perhaps imaging beam 406).That is to say that first optical system 401 and second optical system 402 are arranged in a side of normal 4101, folder is managed line 4101.

In addition, the height 4121 of projector upper end 412 is positioned in the position (in the Y direction) of the height 4111 that is lower than projected image 405 lower ends 411.

By such relation of arranging, can guarantee enough viewing areas of projected image 405.That is to say that as shown in Figure 4, does not interrupt in observer 420 the visual field.At least, observer 420 position in vertical direction shown in Figure 4 without limits.This almost can not be realized by the structure as disclosed conventional art in JP-A-2007-212748.

The position of deflecting element 430 is preferably disposed in the maximum effective diameter of projection optical system, to obtain projected image.That is to say, can be arranged in the whole housing 408 that keeps the projection optical system that first optical system 401 and second optical system 402 form.Only shown the housing 408 that holds the minimum element that is used for the diagram embodiments of the invention among the figure, and barrel or be used to supports the support member of lens etc. not show in the drawings,, but they can be provided with in this Minimum Area.Certainly, if add other elements as required, then need the wideer space that is used to arrange.

Be more preferably and use embodiments of the invention to as disclosed optical system in the Japanese Unexamined Patent Publication No 2004-258620 (JP-A-2004-258620) that submits in advance by the applicant, in JP-A2004-30976 disclosed optical system or as the JP-A2006-23551 that in background technology, illustrates in disclosed in disclosed optical system, or the like.Particularly, in JP-A-2004-258620 disclosed optical system relevant for the enlarging projection optical system of using dioptric system and concave mirror.

Make the light of concave mirror reflection, that is, the projected light beam 407 that is used for diagram example 2 of the present invention is folding with by the space between dioptric system and the concave mirror by level crossing etc.By such structure, can apply under the situation of equipment at it, realize the optical projection system of miniaturization and the size of minimizing projection optical equipment, and can obtain to realize the various effects of mini-plant, comprise the improvement of installability, portable improvement, realization of small outline package (relating to the requirement of precision) and raw-material minimizing.

Using the special-effect of the optical system that obtains intermediary image is the size that has reduced deflecting element 403, because the position of being assembled corresponding to the light of so-called " diaphragm " is provided in second optical system 402, and deflecting element 403 is arranged near this position.Equally, because light is focused near " diaphragm " of second optical system 402, dispersing of projected light beam 407 is relatively little.

In obtaining the optical system of intermediary image, compare with another the traditional optical system that does not form intermediary image, help out and away and the intersecting of imaging beam 406.Simultaneously, because in traditional enlarging projection system, little by little increase, can't obtain in practice in the thought of the inner process of projection optical system at light beam width of projected light beam 407 after the projection optical system outgoing.In addition, because imaging optical system can not be realized in the thought of imaging beam 406 by projected light beam 407 usually for it is installed in barrel or the like usually from separating on every side.On the other hand, in example 2 of the present invention, make imaging beam 406 cross the degeneration that does not produce its projection performance that causes owing to passage of scintillation light when projected light beam 407 is concentrated in the linear travel of projected light beam with convenient notice.

Though be suitable for optical system of the present invention as mentioned above,, provide the oblique-angle projection optical system additionally for having further and the structure of the optical system of concrete effect.That is to say, transfer (shift) for example the object of light valve (moving) from the light shaft offset of first optical system ground to carry out projection in the direction of inclination.In addition, second optical system is made up of reflective optics and second optical system from optical axis one side-prominent (projection optical system of corresponding instance: Fig. 4, Fig. 1 of prior art JP-A-2006-235516 etc.).Equally, needn't transfer object space, the optical system of changeing for a sidesway of relative first optical system of second optical system (for example, conventional arts among the JP-A-2004-309765 (Fig. 2) etc.), the size of second optical system is suitable for too greater than the projection optical system of the effective diameter of first optical system.

If the deflecting element of embodiments of the invention is not provided in such projection optical system, then projected light beam will advance to second optical system transfer side and (be called the A side; Demonstration) opposite side (is called the B side; Do not show) to form projected image.Yet the deflecting element of embodiments of the invention is collapsible, and light beam by to be projected onto A side as mentioned above, may utilize the space that is transferred to its side in second optical system whereby efficiently between a plurality of optical elements.Therefore, can realize more small-sized projection optical system and projection optical equipment.

(example 3)

Fig. 5 is the diagram figure of the structure of the projection optical equipment of example 3 according to an embodiment of the invention.In the projection optical equipment 500 in Fig. 5, first optical system, 501, the second optical systems 502, deflecting element 503, object 504, projected image 505 and projected light beam 507 are similar to respectively, as Fig. 2 or shown in Figure 4, first optical system 201,401, second optical system 202,402, (light path) deflecting element 203,403, object, projected image 205,405 and projected light beam 207,407.Yet example 3 of the present invention is characterised in that the angle of the deflecting element in the example 1 of the present invention or 2 is variable.As shown in Figure 5, by using such structure, can adjust the position of projected image.That is to say, in Fig. 5, can pass through to change the inclined degree of deflecting element with the mobile projector image.Allow the effect of projected image position adjustment almost can not obtain by conventional art.

(example 4)

Fig. 6 A and Fig. 6 B are the diagram figure of the structure of the display device 10 of example 4 according to an embodiment of the invention.Fig. 6 A is that side view and Fig. 6 B of the display device of example 4 is vertical views of the display device of example 4.

Fig. 6 A and Fig. 6 B show that the projection optical equipment of arbitrary example of the present invention is applied to its display device 600.Display device 600 shows the image that is formed by image generation unit by the display device that the projection optical equipment of image generation unit and arbitrary example of the present invention at least forms with projection.

In addition, first optical system, 605, the second optical systems 606 in the example 4 of the present invention, deflecting element 607, intermediary image 608, projected image 609, imaging beam 610, projected light beam 611, and the zone 612 that intersects is similar to example 1 to 3 of the present invention.

Here, this example is by the light valve (reflective liquid crystal panel) 601 as image generation unit, light source 602 (the extra-high pressure mercury lamp of light valve 601 is used to throw light on, Halogen lamp LED, xenon lamp, or the like), and the light distribution that is used to make lamp uniformly evenly lamp optical system 603 form that (optical system is by the first fly lens 603a, the second fly lens 603b, main convergent lens 603c, sub-convergent lens 603d, optional composition such as folding mirror 603f is to carry out the even illumination on the light valve 601 efficiently).In addition, because lamp source 602 does not polarize, often use light polarization conversion element 603e etc. that liquid crystal panel 601 is carried out efficient illumination.More than an example of the lamp optical system 603 that provides of above-mentioned structure, rather than to the restriction of lamp optical system 603.For other examples, transmissive type liquid crystal panel, wherein all can be used as panel 601 corresponding to element that micro-reflector is two-dimensionally arranged and optical modulation is carried out by each catoptron that tilts of pixel etc.Is necessary in order to improve its usefulness light polarization conversion to the liquid crystal panel that uses polarized light, is unnecessary for the panel that does not rely on light polarization still.

Fig. 6 A and Fig. 6 B show the example of the display device 600 that comprises reflective liquid crystal panel 601, and wherein the illumination light of polarization reaches reflective liquid crystal panel 601 by light path resolution element 604 fully.As light path resolution element 604, preferably use polarizing beam splitter (being called PBS below).Form image light based on received image signal at light valve from the light beam of PBS reflection and illumination panel 601.In addition, light modulated on pixel basis normally.Modulation image light is by the projection optical equipment of PBS from illumination light separation and guiding example of the present invention.Then, these are used to integrally support that their housing covering becomes proj ection-type display apparatus 600.

In addition, can easily use it to arrive optical system as shown in Figure 3.Though the example 4 that aforesaid image generates is situations of a panel 601, can prepare corresponding to red, green, panel with indigo plant, then, illumination light is being separated into three primary colors, and they each is being carried out separating of illumination light and projection light as mentioned above, subsequently the three primary colors projection optical system of can synthesizing and lead.Light source 602 is lamp source, but also can use led light source or LD light source.Under the sort of situation, use the lamp optical system that is suitable for light source.If image generation unit self is self luminous element, then do not need lamp optical system 603.

In addition, other video generation devices comprise by scanning the image generation system that LD light source and modulation drive each pixel acquisition display image two-dimensionally.In this case, be used to obtain the scanning light path of projected image corresponding to projecting light path.

(example 5)

Fig. 7 is the diagram figure of the structure of the projection optical equipment of example 5 according to an embodiment of the invention.As shown in Figure 7, the projection optical equipment 700 of example 5 of the present invention is similar with the projection optical equipment of example 1 to 3 of the present invention, comprise for example first optical system 701 of dioptric system, second optical system 702 of concave mirror for example, and the deflecting element 703 of catoptron for example, wherein the light path of the light beam that sends of object plane 704 is by deflecting element 703 deflections and be projected at the screen surface 705 of the position of projection by the projected light beam 706 of deflecting element 703 deflections.

Yet with respect to first optical system 701 in the projection optical equipment shown in Figure 7 700 and second optical system 702, projected light beam is projected downside (light that is used for imaging plane half one is not presented at Fig. 7) from upside.

The so-called front projector that normally is used for office is placed on the table and carries out projection on the screen of front being configured in.In recent years, for example, be used for from the upside to the downside, being projected in the equipment commercialization of wall etc. and structure that may the application of the invention example 5, easily carry out downward projection under the situation of the posture orientation of so-called projector engine parts such as the optical system around not Change Example such as illuminator, panel, projection optical system.As required, deflecting element 703 can be separable.Also can obtain the equipment that upwards projection and projection downwards are used in combination.Certainly, equipment self can vertically be reversed, and the improvement of its layout degree of freedom provides favourable effect to the design of equipment significantly.

In addition, clearly, by downward as the reflecting surface of the deflecting element 703 of example 5 constitutive requirements of the present invention to downside projection projected light beam from upside, it causes dust protection deposition or the like from figure.In addition, though do not show in the drawings because there is not light ray to advance to the rear surface of deflecting element 703, thus be more preferably fully cover optical system so as outside diffused light not from it side enter optical system.When using such structure, the catoptron of concave mirror a little upwards is orientated and from dustproof viewpoint, may obtains very favorable structure.

(example 6)

Fig. 8 A, Fig. 8 B and Fig. 8 C are the diagram figure of projection optical equipment's structure of example 6 according to an embodiment of the invention.Fig. 8 A is the figure of the projection optical equipment of (in projection) when being presented at light beam and being throwed.Fig. 8 B shows wherein when light beam does not throw the movably figure of the projection optical equipment of example 6 of (in non-projection) deflecting element.Fig. 8 C shows that wherein concave mirror (in non-projection) when light beam does not throw is the figure of the projection optical equipment of example 6 movably.More specifically, Fig. 8 B be the deflecting element shown in the displayed map 8A be movably and deflecting element move on to the figure of the situation of the first optical system side, and Fig. 8 C be the concave mirror shown in the displayed map 8A be movably and concave mirror move on to the figure of the situation of the first optical system side.

As Fig. 8 A, Fig. 8 B, shown in Fig. 8 C, the projection optical equipment 800 of example 6 of the present invention is similar to the projection optical equipment of example 5 of the present invention etc., comprise for example first optical system 801 of dioptric system, second optical system 802 of concave mirror for example, and the deflecting element 803 of catoptron for example, wherein the light path of the light beam that sends of object plane 804 is by deflecting element 803 deflections and be projected onto by deflecting element 803 light beams deflected in the projection surface of screen surface for example.

The projection optical equipment 800 of example 6 of the present invention is examples of the projection optical equipment of example 5 of the present invention, wherein concave mirror and the deflecting element 803 as the optical element that constitutes second optical system 802 is movably, and allows to move in non-projection first optical system, 801 sides.For the purpose of the diagram for convenience, light does not show in the drawings.Simultaneously, the projection optical equipment 800 of example 6 of the present invention can be the display device of example 4 for example of the present invention, wherein as the constitutive requirements of display device, light source, illuminator, light valve etc. show the enlarged drawing of the projection optical system of example of the present invention 5 shown in Figure 7 for fear of the complicacy of drawing and be omitted.In addition, as the skeleton view of the configuration relation of second optical system 802 that shows concave mirror etc. for example and deflecting element 803.

In the time of from projection optical equipment's 800 projecting beams, shown in Fig. 8 A, obtain projected image as shown in Figure 7.Yet deflecting element 803, the second optical systems 802 grades are not outstanding from first optical system 801 in projection optical equipment's 800 projecting beams.These parts are movably, and as shown in Figure 8, are allowed to move to first optical system, 801 sides as the concave mirror and the deflecting element 803 of the optical element that constitutes second optical system 802.Though for example 6 of the present invention, be used to support second optical system 802 for example the shell or the like of concave mirror and deflecting element 803 be not presented at Fig. 8 A, Fig. 8 B, in Fig. 8 C, the driving mechanism that can use tradition to use makes second optical system 802 or deflecting element 803 slide and be moved or arm drives along guide rail.Can second optical system 802 or a side of deflecting element 803 for axle rotating mechanism is set, adopt the structure that second optical system 802 or deflecting element 803 are folded.Fig. 8 B demonstration deflecting element 803 makes and is folding situation on the side direction of the deflecting element of rotation axis 805.Because deflecting element 803 is folded to first optical system, 801 sides, so the gap between second optical system 802 of deflecting element 803 and for example concave mirror is increased, not only deflecting element 803 and also for example second optical system 802 of concave mirror etc. also approach first optical system 801.Certainly, might use various means for the method that moves second optical system 802 or deflecting element 803.Simultaneously, deflecting element 803 may be separable structure.In this case, may select the light beam projecting direction.In addition as showing in the drawings that not deflecting element can be fixed, and only concave mirror is removable.Particularly, can comprise concave mirror is folded into the deflecting element side with structure of preventing concave mirror projection when taking in etc.

Though some embodiment and example have been described with reference to the accompanying drawings, for example, might embodiments of the invention and the example display device that can obtain being used for projection optical equipment and use it.For example, might embodiments of the invention and example can obtain being used to throwing and show and the projection optical equipment of the image that the light valve by for example liquid crystal panel generates perhaps use its display device.In addition, for example, might embodiments of the invention and example can obtain being used for as product or be installed in the front projector or the back projector of projection optical system wherein.Though the embodiment of the invention and special example are particularly as mentioned above, the present invention is not limited to described embodiment or special example and the embodiment of the invention and special example and can is changed or revises under the situation that does not deviate from spirit and scope of the invention.

The application requires the rights and interests on the preferential date of Japanese patent application No. 2007-233249 that submitted on September 7th, 2007 and the Japanese patent application No. 2008-159655 that submitted on June 18th, 2008, and the full content of its application is bonded to this by reference.

Claims (13)

1. a projection optical system is characterized in that, comprises:

Be configured to the projection surface that the picture with object conjugate is throwed;

A plurality of optical elements with refractive power; And

The deflecting element that does not have refractive power, it is configured to the light path of deflected beam and the light beam that is deflected by light path between described a plurality of optical elements,

Wherein the projection surface's normal at described projection surface center does not pass through between described a plurality of optical elements or the described a plurality of optical element.

2. projection optical system as claimed in claim 1 is characterized in that, the light beam that described deflecting element is configured to make light path to be deflected is overlapping with the light beam through described a plurality of optical elements.

3. as claim 1 or 2 described projection optical systems, it is characterized in that, described a plurality of optical element comprises: have positive refractive power and be configured to form with first optical system of the intermediary image of described object conjugate and have at least one optical element and be configured to form second optical system with the picture of described intermediary image conjugation.

4. projection optical system as claimed in claim 3 is characterized in that, described at least one optical element comprises the reflective optical devices with positive refractive power.

5. projection optical system as claimed in claim 4 is characterized in that, described reflective optical devices is the optical element of the picture of the most close and described intermediary image conjugation among described at least one optical element.

6. as claim 4 or 5 described projection optical systems, it is characterized in that described deflecting element is configured to the light beam that is deflected by light path between described first optical system and described reflective optical devices.

7. as each described projection optical system in the claim 1 to 6, it is characterized in that described projection optical system comprises the device of arranging that is configured to regulate described deflecting element further.

8. projection optical system as claimed in claim 7 is characterized in that, the described device of arranging that is configured to regulate described deflecting element comprises the device that is configured to move described deflecting element.

9. as each described projection optical system in the claim 1 to 8, it is characterized in that described projection optical system comprises the device of arranging that is configured to regulate described at least one optical element further.

10. projection optical system as claimed in claim 9 is characterized in that, the described device of arranging that is configured to regulate described at least one optical element is the device that is configured to move described at least one optical element.

11., it is characterized in that described projection optical system is to be configured to the picture with described object conjugate is projected projection optical system in the projection surface of a plurality of optical elements below as each described projection optical system in the claim 1 to 10.

12. image display, it comprises the video generation device that is configured to generate image, with the image projection display device that is configured to be shown to by the image projection of described video generation device generation on the display surface, it is characterized in that described image projection display device comprises as each described projection optical system in the claim 1 to 11.

13. image display as claimed in claim 12 is characterized in that, described image display is preceding projection-type image display.

Images