JP2011107295A - Projection optical system, image display device and image display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection optical system which achieves miniaturization. <P>SOLUTION: The projection optical system includes: a dioptric system 200 on which luminous flux from an image generating device 100 is made incident and which forms an intermediate image of an image generated in the image generating device 100 at a position on +Y side relative to an optical axis Ax; a concave mirror 500 which is arranged astern of the intermediate image on an optical path of luminous flux from the dioptric system 200; and a plane mirror 510 which is arranged on the optical path of the luminous flux from the concave mirror 500 between the optical axis Ax of the dioptric system 200 and a reflection area for the luminous flux from the dioptric system 200 in the concave mirror 500, and having a reflection surface deflecting the luminous flux from the concave mirror 500. In such a case, size (volume) of space required to attach a plurality of optical parts constituting the projection optical system is made smaller than in the conventional one. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection optical system, an image display device, and an image display system, and more specifically, a projection optical system that projects light through an object onto a projection surface, an image display device including the projection optical system, and the The present invention relates to an image display system including an image display device.

  2. Description of the Related Art Image display apparatuses including a projection optical system that enlarges and projects an image on an image forming element such as a liquid crystal panel onto a projection surface such as a screen have been commercialized and are widely spread.

  For example, Patent Document 1 discloses a projection optical system that includes a plurality of optical elements having refractive power and projects an image conjugate with an object onto a projection surface, and an image display apparatus including the projection optical system. . The projection optical system includes a deflecting element that deflects the optical path of the light beam, and is provided so that the light beam whose optical path is deflected passes between a plurality of optical elements, and has no refractive power. The normal line of the projection surface at the center of the surface is set so as not to pass between the plurality of optical elements or the plurality of optical elements.

  By the way, in recent years, the use of image display devices has expanded, and accordingly, it can be used even in a narrow place and can display a large image even if the distance to the screen is short. In other words, it is small and has a large enlargement ratio. The demand for image display devices having increased.

  However, the image display device disclosed in Patent Document 1 has a disadvantage that it is difficult to achieve both reduction in size and improvement in enlargement ratio.

  The present invention has been made under such circumstances, and a first object of the invention is to provide a projection optical system that can be miniaturized.

  A second object of the present invention is to provide an image display device capable of achieving both a reduction in size and an improvement in enlargement ratio.

  The third object of the present invention is to provide an image display system capable of achieving both a reduction in size and an improvement in enlargement ratio.

  According to a first aspect of the present invention, a first optical system that receives a light beam through an object and forms an intermediate image of the object at a position on one side with respect to an optical axis; A second optical system disposed behind the intermediate image on the optical path of the luminous flux and including a concave mirror; and on the optical path of the luminous flux from the second optical system, the optical axis of the first optical system and the concave mirror And a deflecting element that is disposed between the reflecting region of the light beam from the first optical system and has a deflecting surface for deflecting the light beam from the second optical system.

  According to this, it is possible to reduce the size as compared with the conventional case.

  According to a second aspect of the present invention, an image generation apparatus includes a light source and an image forming element, and emits a light beam from the light source through the image forming element; and on an optical path of the light beam from the image generation apparatus And a projection optical system of the present invention that projects an enlarged image of the image on the image forming element onto a projection surface.

  According to this, it is possible to achieve both miniaturization and improvement of the enlargement ratio.

  According to a third aspect of the present invention, an image generating device including an image forming element having a light emitting function and emitting a light beam from the image forming element; and disposed on an optical path of the light beam from the image generating device; And a projection optical system of the present invention that projects an enlarged image of the image on the image forming element onto a projection surface.

  According to this, it is possible to achieve both miniaturization and improvement of the enlargement ratio.

  According to a fourth aspect of the present invention, there is provided an image display system comprising: the image display device of the present invention; and an image information management device that sends information about an image to an image generation device of the image display device.

  According to this, it is possible to achieve both miniaturization and improvement of the enlargement ratio.

It is a block diagram for demonstrating schematic structure of the projector system which concerns on one Embodiment of this invention. FIG. 2 is a diagram (part 1) for describing a configuration of a projector device in FIG. 1; FIG. 3 is a second diagram for explaining the configuration of the projector device in FIG. 1; FIG. 4 is a third diagram for explaining the configuration of the projector device in FIG. 1; It is a figure for demonstrating the function and characteristic of a projector apparatus. It is a figure for demonstrating the image generation apparatus in FIG. It is a figure for demonstrating the surface interval of the optical element contained in an image generation apparatus, and an optical characteristic. It is a figure for demonstrating the refractive optical system in FIG. It is a figure for demonstrating the space | interval and optical characteristic of the optical element contained in a refractive optical system. It is a figure for demonstrating the relationship between the surface interval of the optical element contained in a refractive optical system, and screen size. It is a figure for demonstrating the shape of the optical surface of the lens L8. It is a figure for demonstrating the position of the intermediate image formed by a refractive optical system. It is a figure for demonstrating the arrangement position and attitude | position of a concave mirror. It is a figure for demonstrating the shape of the reflective surface of a concave mirror. It is a figure for demonstrating the arrangement position of a plane mirror. It is FIG. (1) for demonstrating the arrangement position of the concave mirror and a plane mirror with respect to a screen. It is FIG. (2) for demonstrating the arrangement position of the concave mirror and a plane mirror with respect to a screen. FIG. 6 is a diagram (part 1) for describing an optical path of a light beam from an object point on an image forming panel. FIG. 19A is a diagram for explaining an optical path when the screen size is 60 inches, and FIG. 19B is a diagram for explaining an optical path when the screen size is 14 inches. FIG. 10 is a second diagram illustrating an optical path of a light beam from an object point on the image forming panel. It is a figure for demonstrating the upper limit position of a reflective surface. FIG. 6 is a first diagram illustrating fifteen object points on an image forming panel. FIG. 9 is a second diagram for explaining 15 object points on the image forming panel; It is a figure for demonstrating the image of 15 object points in case a screen size is 60 inches. It is a figure for demonstrating the image of 15 object points in case a screen size is 30 inches. It is a figure for demonstrating the image of 15 object points in case a screen size is 14 inches. It is a perspective view for demonstrating the minimum opening in case M = + 5mm when the image of 15 object points is formed. It is a perspective view for demonstrating the minimum opening in case M = 0mm when the image of 15 object points is formed. FIG. 11 is a perspective view for explaining a minimum opening when M = −5 mm when images of 15 object points are formed. It is a perspective view for explaining a minimum opening when M = −8 mm when images of 15 object points are formed. It is a figure for demonstrating the minimum opening width in XY plane in case M = + 5mm when the image of 15 object points is formed. It is a figure for demonstrating the minimum opening width in XY plane in case M = 0 mm when the image of 15 object points is formed. It is a figure for demonstrating the minimum opening width in XY plane in case M = -5mm when the image of 15 object points is formed. It is a figure for demonstrating the minimum opening width in a YZ plane in case M = + 8mm when the image of 15 object points is formed. It is a figure for demonstrating the minimum opening width in the YZ plane in case M = -8mm when the image of 15 object points is formed. It is a figure for demonstrating the relationship between the value of M, and the minimum opening width in XY plane and YZ plane. It is a figure for demonstrating the modification of an image generation apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a projector system 10 as an image display system according to an embodiment.

  The projector system 10 includes a projector device 1000 as an image display device and a host device 2000.

  The host device 2000 is an image information management device that sends information about an image to the projector device 1000, and a personal computer can be used as an example. The host device 2000 can send information related to the image sent via the network and information related to the image acquired (downloaded) via the network to the projector device 1000.

  The projector device 1000 is a front projection type projector device that displays an enlarged image on a screen 1100 as a projection surface based on information about an image sent from the host device 2000.

  As shown in FIGS. 2 to 4 as an example, the projector apparatus 1000 includes a projection optical system including a refractive optical system 200, a reflecting mirror 210, a concave mirror 500, and a plane mirror 510, an image generation apparatus 100, and the like. The projection optical system excluding the concave mirror 500 and the image generation apparatus 100 are housed in a housing 1010. In addition, the projection optical system can perform distortion adjustment and focus adjustment according to the screen size, and an adjustment knob is provided so that adjustment can be performed from the outside of the apparatus.

  The housing 1010 is provided with an opening 1020 through which a light beam traveling toward the screen 1100 passes. The opening 1020 is covered with an opening cover when the projector apparatus 1000 is not used. This prevents dust and the like from entering the housing 1010.

  The concave mirror 500 is held by a concave mirror holding member supported by the housing 1010. The concave mirror holding member is accommodated in the housing 1010 together with the concave mirror 500 when the projector apparatus 1000 is not used.

  Here, the concave mirror 500, the concave mirror holding member, and the opening cover can be integrally rotated up and down, and can be stored so that the surface of the opening cover coincides with the position of the surface of the housing 1010. ing.

  Next, the details of each of the above parts will be described. Here, the light beam from the refractive optical system 200 is reflected by the reflecting mirror 210 and enters the concave mirror 500, but for the sake of easy understanding, the reflecting mirror 210 is omitted in the following description. Assume that the light beam from the refractive optical system 200 enters the concave mirror 500 as it is. Then, as shown in FIG. 5, in the XYZ three-dimensional orthogonal coordinate system, the direction parallel to the optical axis Ax of the refractive optical system 200 is defined as the Z-axis direction, and the direction orthogonal to the reflecting surface of the plane mirror 510 is described as the Y-axis direction. .

  As shown in FIG. 6 as an example, the image generating apparatus 100 includes a light source 101, a reflector 102, a color wheel 103, a wheel driving device 104, a rod integrator 105, an illumination optical system 106, an image forming panel 107, a cover glass 108, A reflection prism 109, a communication interface 131, a main controller 132, and the like are included.

  The communication interface 131 controls communication between the main control device 132 and the host device 2000.

  The main control device 132 controls the light source 101, the wheel driving device 104, and the image forming panel 107 in accordance with the information regarding the image received via the communication interface 131.

  Here, the image forming panel 107 is a so-called digital micromirror device having a plurality of micromirrors arranged in a matrix and a mirror control unit that can individually control the inclination angle of each micromirror with respect to incident light. This is a panel using (DMD). The mirror control unit controls the tilt angle of each micromirror according to the image information from the main controller 132. That is, it can be said that an image is formed on a mirror surface on which a plurality of micromirrors are arranged in a matrix.

  The cover glass 108 is provided in front of the image forming panel 107 and protects the image forming panel 107.

  As the light source 101, a lamp light source such as a xenon lamp, a halogen lamp, a metal halide lamp, or an ultrahigh pressure mercury lamp can be used. A solid light source such as an LED, LD, or semiconductor laser may be used.

  The light source 101 is turned on according to an instruction from the main controller 132.

  The reflector 102 condenses the light beam emitted from the light source 101.

  The color wheel 103 is a disk-shaped member having red, blue, and green filters, and is disposed in the vicinity of the condensing position of the light beam from the reflector 102.

  The wheel driving device 104 is a device for rotating the color wheel 103. The wheel driving device 104 rotates the color wheel 103 according to the color information of the image from the main control device 132 so that the light flux from the reflector 102 passes through the filter corresponding to the color information.

  The rod integrator 105 makes the light quantity distribution of the light beam that has passed through the color wheel 103 uniform.

  The illumination optical system 106 efficiently guides the optical path of the light beam via the rod integrator 105 to the total reflection prism 109.

  The total reflection prism 109 is composed of two triangular prisms and has a minute air layer between them.

  The light beam from the illumination optical system 106 incident on the total reflection prism 109 illuminates the image forming panel 107 through the cover glass 108. This illumination light is modulated by the image forming panel 107 in accordance with the image information. Therefore, the light beam reflected by the image forming panel 107 and entering the total reflection prism 109 via the cover glass 108 can be considered as a light beam emitted from an image on the image forming panel 107.

  The light beam reflected by the image forming panel 107 and incident on the total reflection prism 109 via the cover glass 108 passes through the total reflection prism 109 and is emitted to the refractive optical system 200.

  An example of the surface spacing in the Z-axis direction of the image forming panel 107, the cover glass 108, and the total reflection prism 109 is shown in FIG. FIG. 7 also shows an example of the refractive index and Abbe number of the cover glass 108 and the total reflection prism 109. The distance in the Z-axis direction between the + Z side surface (fourth surface) of the total reflection prism 109 and the refractive optical system 200 is 2.00 mm.

  As an example, the refractive optical system 200 includes eleven lenses (L1 to L11) arranged along the Z-axis direction, as shown in FIG. A diaphragm member ST is provided between the lens L5 and the lens L6. The eleven lenses and the aperture member ST are held in a lens barrel (not shown) in a predetermined positional relationship.

  An example of the curvature radius of the optical surface of each lens, the surface interval, the refractive index of each lens, and the Abbe number are shown in FIG. The surface distance d11 between the 14th surface and the 15th surface, the surface space d12 between the 18th surface and the 19th surface, the surface space d13 between the 24th surface and the 25th surface, the 26th surface and the 27th surface (incidence of the concave mirror 500). As shown in FIG. 10, the surface interval d14 of the (side surface) varies depending on the screen size.

  The surface spacing (d11, d12, d13, d14) can be changed by a distortion adjustment knob and a focus adjustment knob (see FIG. 2). Therefore, the refractive optical system 200 is equipped with a so-called cam mechanism for moving the corresponding optical element in the Z direction in conjunction with the distortion adjustment knob and the focus adjustment knob.

  Each optical surface (incident side surface, outgoing side surface) of the lens L8 is a rotationally symmetric aspherical surface. The rotationally symmetric aspherical shape is expressed by the following equation (1). Here, Z is the depth in the optical axis direction, c is the paraxial radius of curvature, r is the distance from the optical axis in the direction orthogonal to the optical axis, k is the conic coefficient, A, B, C,. It is a coefficient.

Z = c · r ² / [1 + √ {1- (1 + k) c ² r ² }] + Ar ⁴ + Br ⁶ + Cr ⁸ + (1)

  An example of the cone coefficient and each aspheric coefficient is shown in FIG.

  Thus, the refractive optical system 200 is an optical system having positive optical power, and forms a curved intermediate image of the image on the image forming panel 107 of the image generating apparatus 100 on the + Y side of the optical axis Ax. (See FIG. 12).

  Here, in order to form the intermediate image at a desired position, that is, a position on the + Y side of the optical axis Ax, the image forming panel 107 is disposed on the −Y side of the optical axis Ax, and the image forming area is the optical axis Ax. I don't want to interact with you. Specifically, when 15 object points (object points 1 to 15) including the four corners are taken on the image forming panel 107, as shown in FIG. The image forming panel 107 is arranged so that the object point is located on the −Y side of the optical axis Ax.

  With such a configuration, the refractive optical system 200 can form the intermediate image completely on the + Y side of the optical axis Ax. As an example, as shown in FIG. 12, this intermediate image is formed on a curved surface that is inclined with respect to a plane parallel to the image forming panel 107 (here, the XY plane). The intermediate image is a reverse image of the image forming panel 107 as a matter of course.

  The concave mirror 500 is disposed on the optical path of the light beam emitted from the refractive optical system 200. Here, as shown in FIG. 13, in the Y-axis direction, the distance d21 between the optical axis Ax of the refractive optical system 200 and the center of the concave mirror 500 is 37.89 mm. Further, the angle θ in FIG. 13 is 34.15 °.

  The shape of the reflecting surface of the concave mirror 500 is an anamorphic free-form surface (polynomial free-form surface) represented by a polynomial such as the following equation (2) with the optical axis Ax of the refractive optical system 200 as a reference. Here, the Y axis direction is the minor axis direction, the X axis direction is the major axis direction, and the Z axis direction is the depth of the curved surface. X2, Y2, X2Y, Y3, X2Y2,... Are coefficients.

^{Z = X2 · x 2 + Y2} · y 2 + X2Y · x 2 y + Y3 · y 3 + X4 · x 4 + X2Y2 · x 2 y 2 + Y4 · y 4 + X4Y · x 4 y + X2Y3 · x 2 y 3 + Y5 · y 5 + X6 · x 6 + X4Y2 · x ⁴ y ² + X2Y4 · x ² y ⁴ + Y6 · y ⁶ + ... (2)

  A specific example of each coefficient is shown in FIG.

  The concave mirror 500 further enlarges the intermediate image formed by the refractive optical system 200.

  The plane mirror 510 is held by a mirror holder (see FIG. 2) and is disposed on the optical path of the light beam reflected by the concave mirror 500. As an example, as shown in FIG. 15, the plane mirror 510 is disposed such that the reflection surface thereof is parallel to the XZ plane and is located on the + Y side of the optical axis Ax of the refractive optical system 200.

  The mirror holder covers an unnecessary portion around the reflection surface so that only necessary light is reflected by the reflection surface. The size of the covering region is set according to the behavior of the light beam obtained by the projection optical system. Here, since the plane mirror 510 is close to the concave mirror 500, the width is set to be different between the side near the concave mirror 500 and the far side.

  As shown in FIG. 16 as an example, the plane mirror 510 deflects the light beam reflected by the concave mirror 500 toward the screen 1100. Here, the light beam deflected by plane mirror 510 passes between refractive optical system 200 and concave mirror 500 and is emitted from projector device 1000. Further, specific values of d41 and d42 in FIG. 16 are shown in FIG.

  Here, for example, as shown in FIG. 18, three object points (A, B, C) on the image forming panel 107 having different positions in the Y-axis direction are considered. The light beam from the object point A passes through the cover glass 108, the total reflection prism 109, and the refractive optical system 200, and is condensed near the position a. The light beam from the object point B passes through the cover glass 108, the total reflection prism 109, and the refractive optical system 200, and is condensed near the position b. The light beam from the object point C passes through the cover glass 108, the total reflection prism 109, and the refractive optical system 200, and is condensed near the position c.

  Therefore, an intermediate image is formed on a curved surface including the position a, the position b, and the position c. This intermediate image is magnified by the concave mirror 500 and formed on the respective image positions A ′, B ′, and C ′, and an image plane conjugate with the surface (mirror surface) of the image forming panel 107 is formed.

  Here, the shape of the surface (mirror surface) of the image forming panel 107 is a rectangular shape having a length between diagonals of 0.55 inches and an aspect ratio of 4: 3. Then, by changing the position of the screen 1100, the screen is designed to be optimized so that a desired imaging performance can be obtained with a screen size from 60 inches to 14 inches (FIGS. 19A and 19B). reference).

  FIG. 20 shows the exit angles (θ1, θ2) from the refractive optical system 200 with respect to the light beams from the three object points (A, B, C), with the optical axis Ax of the refractive optical system 200 as a reference. , Θ3), reflection angles at the concave mirror 500 (θ4, θ5, θ6), deflection angles at the plane mirror 510 (θ7, θ8, θ9), and incident angles to the screen 1100 (θ10, θ11, θ12) The values are shown for each image size. Here, θ1, θ4, θ7, and θ10 correspond to the light flux from the object point A, θ2, θ5, θ8, and θ11 correspond to the light flux from the object point B, and θ3, θ6, θ9, and θ12 are This corresponds to the light beam from the object point C.

  According to this, the light beam from the object point A closest to the optical axis Ax of the refractive optical system 200 is emitted from the refractive optical system 200 at an angle of about 5 ° to 6 °. Therefore, even in the optical path on the most −Y side among the optical paths of the light flux from the refractive optical system 200 toward the concave mirror 500, it is on the + Y side of the optical axis Ax of the refractive optical system 200 in the vicinity of the concave mirror 500. With respect to the Y-axis direction, a space is formed between the optical axis Ax of the refractive optical system 200 and the concave mirror 500 so that the light beam traveling from the refractive optical system 200 toward the concave mirror 500 does not interfere, and the plane mirror 510 is disposed in that space. ing.

  As an example, as shown in FIG. 21, the position of the intersection point Pm between the lower limit light beam emitted from the refractive optical system 200 and the upper limit light beam reflected by the concave mirror 500 in the Y-axis direction is the upper limit position of the reflection surface of the plane mirror 510. It becomes. Here, with respect to the Y-axis direction, the distance between the optical axis Ax of the refractive optical system 200 and the intersection Pm is 11 mm.

  Next, a case where light from 15 object points (object points 1 to 15) on the image forming panel 107 shown in FIGS. 22 and 23 is incident on the refractive optical system 200 will be described as an example.

  FIG. 24 shows the positions of the object point images (image 1 to image 15) on the screen 1100 when the screen size is 60 inches. In addition, the image 1 is an image of the object point 1, the image 2 is an image of the object point 2,..., And the image 15 is an image of the object point 15.

  FIG. 25 shows the positions of object point images (images 1 to 15) on the screen 1100 when the screen size is 30 inches.

  FIG. 26 shows the positions of the object point images (image 1 to image 15) on the screen 1100 when the screen size is 14 inches.

  In any screen size, a projected image with very little distortion is obtained. In FIG. 24 to FIG. 26, the position closest to the optical axis Ax of the refractive optical system 200 in each screen in the Y-axis direction is y = 0 (mm), and the center of each screen in the X-axis direction is x = 0 (mm).

  Next, the relationship between the position of the reflecting surface of the plane mirror 510 in the Y-axis direction and the size of the opening will be described.

  Here, for convenience, the optical axis position of the refractive optical system 200 is Y = 0, and the Y coordinate (mm) of the reflecting surface of the plane mirror 510 is M. The + Y side from the optical axis Ax of the refractive optical system 200 is “+”, and the −Y side from the optical axis Ax of the refractive optical system 200 is “−”.

  It is assumed that the opening is on the + Y side of the optical axis Ax of the refractive optical system 200 and at a position 21 mm from the optical axis Ax of the refractive optical system 200 with respect to the Y-axis direction.

  27 to 30 show main optical paths of light beams from the 15 object points (object points 1 to 15) for various values of M. 27 shows a case where M = + 5 mm, FIG. 28 shows a case where M = 0 mm, FIG. 29 shows a case where M = −5 mm, and FIG. 30 shows a case where M = −8 mm.

  In FIGS. 27 to 30, the lower limit of the size of the opening necessary for the light beam deflected by the reflecting surface of the plane mirror 510 to go to the screen without being shielded is indicated by a wavy line. According to these, as the value of M decreases, the lower limit of the size of the opening increases.

  31 to 33 show the lower limit of the size of the opening in the XY plane for various values of M. 31 shows a case where M = + 5 mm, FIG. 31 shows a case where M = 0 mm, and FIG. 32 shows a case where M = −5 mm. The lower limit value of the opening size in the XY plane was 55 mm when M = + 5 mm, 96 mm when M = 0 mm, and 137 mm when M = −5 mm.

  34 and 35 show the lower limit of the size of the opening in the YZ plane for different M values. FIG. 34 shows a case where M = + 8 mm, and FIG. 35 shows a case where M = −8 mm.

  FIG. 36 shows the lower limit value of the opening size in the XY plane and the lower limit value of the opening size in the YZ plane for various values of M. A linear relationship is established between the value of M and the lower limit value of the opening size. In particular, with respect to the XY plane, in the present embodiment, the reflecting area of the concave mirror 500 is about 70 mm in the X-axis direction, so that the light flux width is the same as that of the concave mirror 500 by arranging the plane mirror 510 at a position where M> 0. Or less.

  As is clear from the above description, in the projector apparatus 1000 according to the present embodiment, the refractive optical system 200, the reflecting mirror 210, the concave mirror 500, and the plane mirror 510 constitute the projection optical system of the present invention.

  The refractive optical system 200 and the reflecting mirror 210 constitute a first optical system in the projection optical system of the present invention, and the concave mirror 500 constitutes a second optical system in the projection optical system of the present invention. The plane mirror 510 constitutes a deflection element in the projection optical system of the present invention, and the reflection surface of the plane mirror 510 constitutes the deflection surface of the deflection element.

  As described above, according to the projection optical system according to the present embodiment, a light beam is incident through the image forming panel 107, and the intermediate image of the image on the image forming panel 107 is positioned on the + Y side with respect to the optical axis Ax. Formed on the optical path of the light beam from the refractive optical system 200, the concave mirror 500 disposed behind the intermediate image on the optical path of the light beam from the refractive optical system 200, the optical path of the light beam from the concave mirror 500, A plane mirror 510 having a reflecting surface that is disposed between the optical axis Ax and the reflection region of the light beam from the refractive optical system 200 in the concave mirror 500 and deflects the light beam from the concave mirror 500 is provided.

  In this case, the size (volume) of the space required for attaching a plurality of optical components constituting the projection optical system is smaller than the conventional one. Accordingly, it is possible to reduce the size.

  In addition, since the plane mirror is used to deflect the light beam from the concave mirror 500, the occurrence of aberration due to reflection can be suppressed, and the deterioration of the projected magnified image can be suppressed.

  Further, since the reflecting surface of the plane mirror 510 is parallel to the optical axis direction of the refractive optical system 200, application to the projector device is easy.

  The image generating apparatus 100 is provided on the opposite side of the reflecting surface of the plane mirror 510 with respect to the optical axis Ax of the refractive optical system 200. In this case, the intermediate image can be easily formed on the reflecting surface side.

  According to the projector apparatus 1000 according to the present embodiment, the image generating apparatus 100 includes the light source 101 and the image forming panel 107 and emits the light beam from the light source 101 via the image forming panel 107, and the light beam from the image generating apparatus 100. And a projection optical system that projects an enlarged image of the image on the image forming panel 107 onto the screen 1100.

  In this case, even if the enlargement ratio is increased, the size of the opening 1020 does not need to be increased so much that the casing 1010 is not increased in size. Therefore, it is possible to achieve both downsizing and improvement in enlargement ratio.

  In addition, since the size of the opening 1020 is small, entry of dust or the like into the housing 1010 can be easily suppressed. In addition, when a dustproof cover is provided in the opening, a high dustproof effect can be easily obtained with a simple dustproof cover. That is, reliability can be improved.

  Further, according to the projector system 10 according to the present embodiment, since the projector apparatus 1000 is provided, it is possible to achieve both reduction in size and improvement in enlargement ratio as a result.

  In the above embodiment, instead of the concave mirror 500, an optical system including a refractive optical system and a concave mirror may be used. Further, instead of the concave mirror 500, an optical system composed of a plurality of reflecting mirrors including a concave mirror may be used.

  In the above embodiment, the projector device 1000 and the host device 2000 may be integrated.

  Moreover, although the said embodiment demonstrated the case where the panel using a digital micromirror device (DMD) was used as an image forming element, it is not limited to this. For example, a reflective liquid crystal panel or a transmissive liquid crystal panel may be used.

  As an example, FIG. 37 shows an image generating apparatus 100A using a reflective liquid crystal panel as an image forming element.

  The image generation apparatus 100A includes a light source 110, a cut filter 111, a polarization conversion element 112, a pair of fly-eye lens arrays (113A and 113B), a condenser lens 115, two dichroic mirrors (116A and 116B), a reflection mirror 117, It has three polarization separation elements (118A, 118B, 118C), three reflective liquid crystal panels (120A, 120B, 120C), a cross prism 124, and the like.

  The light source 110 is a light source similar to the light source 101 described above.

  The cut filter 111 removes UV components and IR components contained in the light emitted from the light source 110. Thereby, deterioration of the optical element can be suppressed.

  The polarization conversion element 112 converts the polarization state of the light beam that has passed through the cut filter 111 into predetermined linearly polarized light. Thereby, the light utilization efficiency can be increased.

  The pair of fly-eye lens arrays (113A, 113B) are arranged on the optical path of the light beam via the polarization conversion element 112, and uniformize the light amount distribution.

  The condenser lens 115 is disposed on the optical path of the light flux through a pair of fly-eye lens arrays (113A, 113B). The condenser lens 115 can adjust the incident angle and illumination area of the illumination light when illuminating each reflective liquid crystal panel.

  The dichroic mirror 116A is disposed on the optical path of the light flux through the condenser lens 115, selectively reflects the blue wavelength component contained in the light flux, and transmits the remaining (green wavelength component + red wavelength component).

  The dichroic mirror 116B is disposed on the optical path of the light beam that has passed through the dichroic mirror 116A, selectively reflects the green wavelength component contained in the light beam, and transmits the rest (red wavelength component).

  The polarization separation element 118A is disposed on the optical path of the light beam that has passed through the dichroic mirror 116B. The polarization separation element 118A has a polarization separation surface that reflects the predetermined linearly polarized light in the + X direction. Therefore, the light beam transmitted through the dichroic mirror 116B is reflected in the + X direction by the polarization separation element 118A.

  The reflective liquid crystal panel 120A is disposed on the + X side of the polarization separation element 118A. Therefore, the reflective liquid crystal panel 120A is illuminated with the light beam reflected by the polarization separation element 118A. This illumination light is modulated by the reflective liquid crystal panel 120A, and image information of a red component is given.

  The light beam modulated and reflected by the reflective liquid crystal panel 120A enters the polarization separation element 118A with the polarization state of S-polarized light being P-polarized at the time of incidence. The light beam passes through the polarization separation element 118A.

  The polarization separation element 118B is disposed on the optical path of the light beam reflected by the dichroic mirror 116B. The polarization separation element 118B has a polarization separation surface that reflects the predetermined linearly polarized light in the −Z direction. Therefore, the light beam reflected by the dichroic mirror 116B is reflected in the −Z direction by the polarization separation element 118B.

  The reflective liquid crystal panel 120B is disposed on the −Z side of the polarization separation element 118B. Therefore, the reflective liquid crystal panel 120B is illuminated with the light beam reflected by the polarization separation element 118B. This illumination light is modulated by the reflective liquid crystal panel 120B, and image information of a green component is given.

  The light beam modulated and reflected by the reflective liquid crystal panel 120B enters the polarization separation element 118B with the polarization state of S-polarized light being P-polarized at the time of incidence. The light beam passes through the polarization separation element 118B.

  The reflection mirror 117 is disposed on the optical path of the light beam reflected by the dichroic mirror 116A and reflects the light beam. Here, the reflection mirror 117 reflects the light beam in the + Z direction.

  The polarization separation element 118C is disposed on the optical path of the light beam reflected by the reflection mirror 117. The polarization separation element 118C has a polarization separation surface that reflects the predetermined linearly polarized light in the −X direction. Therefore, the light beam reflected by the reflection mirror 117 is reflected in the −X direction by the polarization separation element 118C.

  The reflective liquid crystal panel 120C is disposed on the −X side of the polarization separation element 118C. Therefore, the reflective liquid crystal panel 120C is illuminated with the light beam reflected by the polarization separation element 118C. This illumination light is modulated by the reflective liquid crystal panel 120C, and is provided with image information of a blue component.

  The light beam modulated and reflected by the reflective liquid crystal panel 120C enters the polarization separation element 118C with the polarization state of S-polarized light being P-polarized at the time of incidence. The light beam passes through the polarization separation element 118C.

  The cross prism 124 is disposed on the −X side of the polarization separation element 118A, on the + Z side of the polarization separation element 118B, and on the + X side of the polarization separation element 118C. The cross prism 124 has a reflection surface that reflects the light beam that has passed through the polarization separation element 118A in the + Z direction, and a reflection surface that reflects the light beam that has passed through the polarization separation element 118C in the + Z direction.

  Therefore, a light beam that has been provided with red component image information and transmitted through the polarization separation element 118A, a light beam that has been provided with a green information image signal and transmitted through the polarization separation element 118B, and a light beam that has been provided with a blue information image signal have been provided to the polarization separation element 118A. The transmitted light beam is combined by the cross prism 124.

  The light beam synthesized by the cross prism 124 is a light beam emitted from the image generating apparatus 100A. This light beam is incident on the refractive optical system 200.

  In the above embodiment, an image forming element having a light emitting function may be used as the image forming element. In this case, the light source 101 is not necessary. Therefore, further miniaturization can be achieved.

  In the above embodiment, the case where the refractive optical system 200 includes eleven lenses (L1 to L11) has been described. However, the present invention is not limited to this. In short, the refractive optical system 200 is formed by the refractive optical system 200. The intermediate image may be at a position on the + Y side with respect to the optical axis Ax of the refractive optical system 200.

  In addition, the optical characteristics and the surface spacing of each optical element in the refractive optical system 200 are only examples, and are not limited thereto.

  Furthermore, the aspherical shape of each optical surface (incident side surface, outgoing side surface) of the lens L8 in the refractive optical system 200 is an example, and is not limited to this.

  Moreover, the shape of the reflective surface of the concave mirror 500 in the above embodiment is an example, and the present invention is not limited to this.

  Moreover, although the said embodiment demonstrated the case where a plane mirror was used as a deflection | deviation element, it is not limited to this. In short, it is sufficient that the deflecting surface is disposed on the optical path of the light beam from the concave mirror 500 and between the optical axis Ax of the refractive optical system 200 and the reflection region of the light beam from the refractive optical system 200 in the concave mirror 500. .

  Further, the shape of the projector device in the above embodiment is an example, and the present invention is not limited to this.

  Further, the configuration of the projector device in the above embodiment is an example, and the present invention is not limited to this. In short, the projection of the present invention is arranged on an optical path of an image forming element and a light beam that passes through or is emitted from the image forming element, and projects an enlarged image of the image on the image forming element onto a projection surface. It suffices to have at least an optical system.

  In addition, the projection optical system according to the present embodiment can be used other than the projector apparatus. For example, it can be used as an imaging optical system of a scanner device.

  As described above, the projection optical system of the present invention is suitable for downsizing. Further, the image display device of the present invention is suitable for achieving both miniaturization and improvement of the enlargement ratio. Moreover, the image display system of the present invention is suitable for achieving both a reduction in size and an improvement in enlargement ratio.

  DESCRIPTION OF SYMBOLS 10 ... Projector system (image display system), 100 ... Image generating apparatus, 100A ... Image generating apparatus, 101 ... Light source, 107 ... Image forming panel (image forming element), 120A ... Reflective type liquid crystal panel (image forming element), 120B ... reflective liquid crystal panel (image forming element), 120C ... reflective liquid crystal panel (image forming element), 200 ... refractive optical system (part of the first optical system, lens group), 210 ... reflective mirror (first optical system) , 500 ... concave mirror 500 (second optical system), 510 ... plane mirror (deflection element), 1000 ... projector device (image display device), 2000 ... host device (image information management device).

JP 2009-80462 A

Claims (11)

A first optical system that receives a light beam through the object and forms an intermediate image of the object at a position on one side with respect to the optical axis;
A second optical system disposed behind the intermediate image on an optical path of a light beam from the first optical system and including a concave mirror;
The second optical system is disposed on the optical path of the light beam from the second optical system and between the optical axis of the first optical system and a reflection region of the light beam from the first optical system in the concave mirror. A projection optical system comprising: a deflection element having a deflection surface for deflecting a light beam from the projection optical system.   2. The deflecting surface of the deflecting element deflects a light beam from the second optical system so that the light beam passes between the first optical system and the second optical system. The projection optical system described in 1.   The projection optical system according to claim 1, wherein the deflecting element has no optical power.   The projection optical system according to claim 3, wherein the deflection element is a plane mirror.   5. The projection optical system according to claim 1, wherein the deflection element is disposed so that the deflection surface is parallel to an optical axis of the first optical system.   The said 1st optical system contains the lens group in which the light beam through an object injects, and the folding mirror arrange | positioned on the optical path of the light beam from this lens group, The one of Claims 1-5 characterized by the above-mentioned. The projection optical system according to one item. An image generating apparatus that includes a light source and an image forming element, and emits a light beam from the light source through the image forming element;
The projection optical system according to claim 1, wherein the projection optical system is disposed on an optical path of a light beam from the image generation device and projects an enlarged image of an image on the image forming element onto a projection surface. An image display device provided. An image generating device including an image forming element having a light emitting function and emitting a light beam from the image forming element;
The projection optical system according to claim 1, wherein the projection optical system is disposed on an optical path of a light beam from the image generation device and projects an enlarged image of an image on the image forming element onto a projection surface. An image display device provided.   9. The image generation apparatus according to claim 7, wherein the image generation apparatus is provided on a side opposite to a deflection surface of a deflection element of the projection optical system with respect to an optical axis of the first optical system of the projection optical system. The image display device described in 1.   10. The image display device according to claim 7, wherein the image on the image forming element and the enlarged image projected on the projection surface have the same vertical and horizontal relationships. An image display device according to any one of claims 7 to 10;
An image display system comprising: an image information management device that sends information about an image to an image generation device of the image display device.