JP2006259174A - Irradiation optical unit and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an irradiation optical unit and a projector capable of suppressing the occurrence of a ghost mixed in an image projected by the projector. <P>SOLUTION: In the projector, an irradiation lens 12 which irradiates a reflective light bulb 11 (optical element) such as DMD with light is in the shape by removing a part of a convex lens bordering on a border plane and arranged so that production of an optical path emitted from an emission curved surface along the inner surface of the border plane crosses any segment connecting a point on the emission curved surface and a point on the reflective light bulb 11 and passes the outside of the reflective light bulb 11. Since light reflected in the inner surface of the border plane passes the outside of the reflective light bulb 11, occurrence of the ghost in a projected image resulting from incidence of the light reflected on the border plane on the reflective light bulb 11 is suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an irradiation optical unit for irradiating light to an optical element, and a projector that projects an image using a reflective light valve as the optical element.

  In the field of presentation or video projection, a projector that enlarges and projects an image based on image data onto an external screen or the like is used. Patent Document 1 discloses various projector configurations.

  FIG. 6 is a configuration diagram showing a part of an optical system of a conventional projector. The projector includes a reflective light valve 21 that emits an image by reflecting irradiated light, an irradiation lens 22 that collects incident light and irradiates the reflected light valve 21, and a reflective light valve 21. And an optical projection system 23 that projects the image emitted from the outside to the outside. In FIG. 6, the light path is indicated by a one-dot chain line.

  The reflective light valve 21 is configured using a liquid crystal panel, DMD (Didital Micromirror Device), or the like. When the reflective light valve 21 is a liquid crystal panel, the liquid crystal panel changes the reflectance at each pixel in the liquid crystal panel according to the image signal, and each pixel reflects light with the reflectance according to the image signal. Thus, an image composed of reflected light is emitted. When the reflective light valve 21 is a DMD, the DMD has a plurality of minute mirrors arranged two-dimensionally. In the DMD, a minute mirror corresponding to a light emitting pixel reflects light in the direction of the projection optical system 23, and a minute mirror corresponding to a non-light emitting pixel reflects light in a direction not incident on the projection optical system 23. In addition, by controlling the direction in which each micromirror reflects light in accordance with the image signal, an image made of reflected light is emitted in the direction of the projection optical system 23. The projection optical system 23 projects the image emitted from the reflective light valve 21 to the outside, and the image is enlarged and projected on an external screen or the like. In addition, a rear projection projector that projects an image on the screen by projecting an image from the rear surface of the transmissive screen has been put into practical use.

  In the projector having the above-described configuration, an irradiation optical axis for irradiating light to the reflection type light valve 21 and a reflection optical axis for reflecting the light by the reflection type light valve 21 are necessary. In many cases, the optical system is designed so that the reflection optical axis forms a predetermined angle. Here, if the distance between the reflective light valve 21 and the irradiation lens 22 and the distance between the reflective light valve 21 and the projection optical system 23 are designed to be large, the size of the projector increases and a lens with a long focal length is required. This increases the cost of the projector. Therefore, it is desirable to design the optical system so that the distance between the reflective light valve 21 and the irradiation lens 22 and the projection optical system 23 is as short as possible. In this case, however, the irradiation lens 22 and the projection optical system 23 are designed. Physical interference occurs between the two. Therefore, an optical system is configured by using the irradiation lens 22 from which a portion physically interfering with the projection optical system 23 is removed.

FIG. 7 is a perspective view showing an example of the irradiation lens 22 with a part removed. It has a boundary surface other than the incident curved surface on which light is incident and the outgoing curved surface from which light is emitted, and is formed in a shape in which a part of the convex lens is removed with the boundary surface as a boundary. By constructing the optical system using the irradiation lens 22 having a shape in which a part of the convex lens is removed as shown in the figure, it is possible to realize a projector having a small overall size and suppressing an increase in cost.
JP 2004-279440 A

  By the way, in the projector as described above, most of the light contained in the light beam incident on the irradiation lens 22 is collected by the irradiation lens 22 and irradiated to the reflection type light valve 21. There is light that cannot be collected by the condenser lens 22 because a boundary surface exists in the middle of the optical path. FIG. 8 is a schematic cross-sectional view showing a cross section of the reflective light valve 21 and the irradiation lens 22 in a plane including the optical axis of the conventional irradiation lens 22. In the drawing, the optical axis of the irradiation lens 22 is indicated by a one-dot chain line. The light indicated by the solid line in the figure has a boundary surface in the middle of the optical path, so that it is reflected at the boundary surface and refracted on the exit curved surface of the irradiation lens 22 at a different angle from the light collected by the irradiation lens 22. The reflective light valve 21 is irradiated. Light irradiated at an angle different from the collected light is reflected by the surface cover of the reflective light valve 21 and is projected from the projection optical system 23 together with an image emitted from the reflective light valve 21. As a result, a ghost attributed to light reflected by the surface cover of the reflective light valve 21 is mixed in the image projected by the projector.

  FIG. 9 is a schematic diagram illustrating an example of a ghost mixed in an image projected by the projector. In the figure, bright spots included in the projected image are shown separately from the image emitted from the reflective light valve 21. If the projected image is a bright image, the ghost does not stand out. However, if the projected image is a dark image such as a black screen, a ghost that reflects the shape of the boundary surface of the irradiation lens 22 as shown in FIG. 9 appears. . As described above, in the projector in which the optical system is configured by using the irradiation lens 22 having a shape in which a part of the convex lens is removed, there is a problem that a ghost caused by the light reflected on the boundary surface of the irradiation lens 22 is mixed in the projection image. .

  The present invention has been made in view of such circumstances, and an object of the present invention is to irradiate light that can prevent light reflected by the boundary surface of the irradiation lens from entering the reflective light valve. It is an object of the present invention to provide a projector capable of suppressing generation of ghosts mixed in a unit and a projection image.

  An irradiation optical unit according to the present invention includes an irradiation optical unit including an irradiation lens that has an incident curved surface and an outgoing curved surface of light, and is arranged so that a light beam incident on the incident curved surface is emitted from the outgoing curved surface and irradiated to an optical element. The irradiation lens is formed in a shape in which a part of the convex lens is removed with a boundary surface other than the incident curved surface and the outgoing curved surface as a boundary, and the boundary is included in the light included in the light beam incident on the incident curved surface. The light reflected by the inner surface of the surface is disposed so as to be out of the optical element.

  In the present invention, the irradiation lens that irradiates light to the optical element is formed in a shape obtained by removing a part of the convex lens with the boundary surface as a boundary, and is reflected by the inner surface of the boundary surface of the incident light flux. It arrange | positions so that the emitted light may remove | deviate from an optical element.

  An irradiation optical unit according to the present invention includes an irradiation optical unit including an irradiation lens that has an incident curved surface and an outgoing curved surface of light, and is arranged so that a light beam incident on the incident curved surface is emitted from the outgoing curved surface and irradiated to an optical element. The irradiation lens is formed in a shape in which a part of the convex lens is removed with a boundary surface other than the incident curved surface and the outgoing curved surface as a boundary, and at least a part of the boundary surface includes an optical axis of the irradiation lens. An inclined surface formed so as to form a straight line inclined with respect to the optical axis in a cross section is formed, and an extension line of an optical path exiting from the exit curved surface along the inner surface of the inclined surface is a point on the exit curved surface and the optical The irradiation lens is arranged so as to cross any line segment connecting points on the element and pass outside the optical element.

  In the present invention, the irradiation lens that irradiates light to the optical element is formed in a shape in which a part of the convex lens is removed with the boundary surface as a boundary, and is included in the range where the light beam is incident This part is formed by an inclined surface forming a straight line inclined with respect to the optical axis in a cross section including the optical axis. The extension line of the optical path exiting from the exit curved surface along the inner surface of the inclined surface intersects any line segment connecting the point on the exit curved surface and the point on the optical element, and passes outside the optical element. In addition, an optical element and an irradiation lens are arranged. The light reflected by the inner surface of the inclined surface travels in a direction closer to the outgoing curved surface than the optical path exiting from the outgoing curved surface along the inner surface of the inclined surface, so that the optical element on the opposite side of the outgoing curved surface to the optical path It cannot be closer than the optical path and always passes outside the optical element.

  An irradiation optical unit according to the present invention includes an irradiation optical unit including an irradiation lens that has an incident curved surface and an outgoing curved surface of light, and is arranged so that a light beam incident on the incident curved surface is emitted from the outgoing curved surface and irradiated to an optical element. The irradiation lens is formed in a shape in which a part of the convex lens is removed with a boundary surface other than the incident curved surface and the outgoing curved surface as a boundary, and at least a part of the boundary surface includes an optical axis of the irradiation lens. A first inclined surface that intersects the exit curved surface with a straight line inclined with respect to the optical axis in the cross section and a second inclined surface that intersects the incident curved surface with a straight line inclined with respect to the optical axis within the cross section in the cross section And an extension of the optical path that exits from the exit curved surface along the inner surface of the first inclined surface is a point on the exit curved surface and a point on the optical element. On any line segment And, moreover so as to pass through outside the optical element, characterized in that it is arranged at the irradiation lens.

  In the present invention, the irradiation lens that irradiates light to the optical element is formed in a shape in which a part of the convex lens is removed with the boundary surface as a boundary, and is included in the range where the light beam is incident The second portion intersects the incident curved surface by forming a straight line inclined with respect to the optical axis in a cross section including the optical axis and intersecting with the outgoing curved surface. The inclined surface is convex with respect to the optical axis. Furthermore, the extension line of the optical path exiting from the exit curved surface along the inner surface of the first inclined surface intersects any line segment connecting the point on the exit curved surface and the point on the optical element, and the outside of the optical element. The optical element and the irradiation lens are arranged so as to pass through the lens. The light reflected from the inner surface of the first inclined surface travels in a direction closer to the outgoing curved surface than the optical path exiting from the outgoing curved surface along the inner surface of the first inclined surface, and therefore is on the opposite side of the outgoing curved surface with respect to the optical path. The optical element cannot be closer than the optical path, and always passes outside the optical element.

  An irradiation optical unit according to the present invention includes an irradiation optical unit including an irradiation lens that has an incident curved surface and an outgoing curved surface of light, and is arranged so that a light beam incident on the incident curved surface is emitted from the outgoing curved surface and irradiated to an optical element. The irradiation lens is formed in a shape in which a part of the convex lens is removed with a boundary surface other than the incident curved surface and the outgoing curved surface as a boundary, and at least a part of the boundary surface includes an optical axis of the irradiation lens. A first inclined surface that intersects the exit curved surface with a straight line inclined with respect to the optical axis in the cross section and a second inclined surface that intersects the incident curved surface with a straight line inclined with respect to the optical axis within the cross section in the cross section And an extension of the optical path that exits from the exit curved surface along the inner surface of the second inclined surface is a point on the exit curved surface and a point on the optical element. Intersection on any connected line And, moreover so as to pass through outside the optical element, characterized in that it is arranged at the irradiation lens.

  In the present invention, the irradiation lens that irradiates light to the optical element is formed in a shape in which a part of the convex lens is removed with the boundary surface as a boundary, and is included in the range where the light beam is incident The second portion intersects the incident curved surface by forming a straight line inclined with respect to the optical axis in a cross section including the optical axis and intersecting with the outgoing curved surface. The inclined surface is formed in a concave shape with respect to the optical axis. Furthermore, the extension line of the optical path exiting from the exit curved surface along the inner surface of the second inclined surface intersects any line segment connecting the point on the exit curved surface and the point on the optical element, and is outside the optical element. The optical element and the irradiation lens are arranged so as to pass through the lens. The light reflected from the inner surface of the second inclined surface travels in a direction closer to the outgoing curved surface than the optical path exiting from the outgoing curved surface along the inner surface of the second inclined surface, and thus is on the opposite side of the outgoing curved surface with respect to the optical path. The optical element cannot be closer than the optical path, and always passes outside the optical element.

  A projector according to the present invention includes the irradiation optical unit according to any one of the present inventions, and the optical element included in the irradiation optical unit reflects the irradiated light to generate an image including reflected light. It is a type | mold light valve, Furthermore, the light source which generate | occur | produces in the irradiation lens with which the said irradiation optical unit is equipped, and the means to project the image which the said optical element produced | generated outside are characterized by the above-mentioned.

  In the present invention, a projector that projects an image to the outside is realized by using a reflective light valve such as a DMD or a liquid crystal panel as an optical element.

  In the present invention, the light reflected on the inner surface of the boundary surface out of the light incident on the irradiation lens deviates from the optical element, thus preventing the light reflected on the boundary surface of the irradiation lens from entering the optical element. can do.

  Further, in the present invention, in a projector using a reflective light valve as an optical element, a projected image resulting from the projection of light incident on the reflective light valve after being reflected at the boundary surface of the irradiation lens. It is possible to suppress the occurrence of ghost. Therefore, the present invention has an excellent effect, for example, the quality of the projected image can be improved particularly when the projector projects a dark image such as a black screen.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
FIG. 1 is a configuration diagram showing a configuration example of an optical system of a projector according to the present invention. The projector 1 includes a light source 17, a rod integrator 16 that equalizes the distribution of light emitted from the light source 17, a condensing lens 15 that condenses light that has passed through the rod integrator 16, and light that is collected by the condensing lens 15. The reflecting mirror 13 that changes the optical path, the irradiation lens 12 that collects and irradiates the light reflected by the reflecting mirror 13, and the reflective light valve that emits an image by reflecting the light irradiated from the irradiation lens 12 (optical) Element) 11 and a projection optical system 14 for projecting an image emitted from the reflective light valve 11 to the outside. In the figure, the light path is indicated by a one-dot chain line. The rod integrator 16, the condensing lens 15, and the reflecting mirror 13 are optically aligned, and the light generated by the light source 17 passes through the rod integrator 16 and the condensing lens 15 and is reflected by the reflecting mirror 13. Further, the light is further condensed by the irradiation lens 12 and irradiated to the reflection type light valve 11.

  The reflection type light valve 11 is a DMD or a reflection type liquid crystal panel that is irradiated with light from the irradiation lens 12, and is configured to generate an image composed of reflected light that reflects the irradiation light. The reflection type light valve 11 and the irradiation lens 12 constitute the irradiation optical unit of the present invention. The projection optical system 14 is configured to project an image generated by the reflective light valve 11 to the outside. The projector 1 is configured to project an image on an external screen or the like as described above.

  Next, the configuration of the irradiation optical unit of the present invention will be described. FIG. 2 is a schematic side view showing the positional relationship between the reflective light valve 11, the irradiation lens 12, and the projection optical system 14, as viewed from a direction parallel to the reflective surface of the reflective light valve 11. As shown in FIG. In the figure, the center of the light beam applied to the reflective light valve 11 is indicated by a one-dot chain line and an arrow. The projection optical system 14 is disposed substantially in front of the reflective light valve 11. The irradiation lens 12 is formed in a shape in which a part of the peripheral edge of the convex lens is removed so as not to physically interfere with the projection optical system 14, and the projection optical system 14 disposed in front of the reflective light valve 11. It is located in the part from which is removed, and is arranged so as to occupy the periphery of the projection optical system 14. Further, the optical axis of the irradiation lens 12 is set to be inclined at a predetermined angle with respect to the normal line of the reflective light valve 11.

  FIG. 3 is a schematic cross-sectional view showing a cross section of the reflective light valve 11 and the irradiation lens 12 in a plane including the optical axis of the irradiation lens 12. In the drawing, the optical axis of the irradiation lens 12 is indicated by a one-dot chain line, and the optical path of the light incident on the irradiation lens 12 is indicated by a solid line and an arrow. The irradiation lens 12 is formed in a shape in which a part of the peripheral edge of the convex lens is removed as described above. In addition to the incident curved surface on which light is incident and the outgoing curved surface from which light exits, the irradiation lens 12 has a boundary between the removed portion of the convex lens and the remaining portion. Has a boundary surface. Most of the light contained in the light beam reflected by the reflecting mirror 13 and incident on the incident curved surface is collected by the irradiation lens 12 and irradiated to the reflective light valve 11. However, the light flux also includes light that reflects off the boundary surface.

  The portion of the boundary surface of the irradiation lens 12 that is included in the range in which the light beam reflected by the reflecting mirror 13 is incident is an inclined surface that forms a straight line that is inclined with respect to the optical axis in the cross section that includes the optical axis. It is formed with. The extension line of the optical path exiting from the exit curved surface along the inner surface of the boundary surface of the portion formed by the inclined surface is any line segment connecting the point on the exit curved surface and the point on the reflective light valve 11. The distance between the reflection type light valve 11 and the irradiation lens 12, the posture of the irradiation lens 12 with respect to the reflection type light valve 11, and the like are determined so as to intersect and pass outside the reflection type light valve 11. Has been placed. In FIG. 3, the extension line of the optical path is indicated by a broken line.

  Since the extension line of the optical path exiting from the exit curved surface along the inner surface of the boundary surface intersects with any line segment connecting the point on the exit curved surface and the point on the reflective light valve 11, the reflective light valve 11 and the exit curved surface of the irradiation lens 12 are located on opposite sides of the extension line. Since the light hitting the inner surface of the boundary surface is reflected toward the inner side of the irradiation lens 12 with respect to the boundary surface, the light travels along the inner surface of the boundary surface in a direction closer to the outgoing curved surface than the optical path exiting from the outgoing curved surface. Therefore, the light impinging on the inner surface of the boundary surface cannot approach the reflective light valve 11 on the opposite side of the exit curved surface with respect to the light path exiting from the exit curved surface along the inner surface of the boundary surface, and always approach the light path. It passes outside the reflective light valve 11. Therefore, the light reflected by the inner surface of the boundary surface among the light included in the light beam incident on the incident curved surface of the irradiation lens 12 always leaves the reflective light valve 11.

  As described above, in the irradiation optical unit of the present invention, the light reflected on the inner surface of the boundary surface among the light incident on the irradiation lens 12 always leaves the reflective light valve 11, and therefore the boundary of the irradiation lens 12. The light reflected by the surface is prevented from entering the reflective light valve 11. Therefore, in the projector 1 of the present invention, the ghost as shown in FIG. 9 is generated in the projection image resulting from the projection of the light that is reflected by the boundary surface of the irradiation lens 12 and incident on the reflective light valve 11. Can be prevented. As a result, the quality of the projected image can be improved particularly when the projector 1 projects a dark image such as a black screen.

  In addition, the part which has comprised the inclined surface demonstrated above among the boundary surfaces of the irradiation lens 12 should just be a part of boundary surface in the range into which light beams, such as a part nearest to an optical axis, inject. The portion of the boundary surface where the light beam is not incident may have an arbitrary shape such as a shape parallel to the optical axis.

  Next, another possible configuration of the irradiation optical unit of the present invention will be described. FIG. 4 is a schematic cross-sectional view showing a first other configuration example of the irradiation optical unit of the present invention. In the drawing, a cross section of the reflection type light valve 11 and the irradiation lens 12 in a plane including the optical axis of the irradiation lens 12 is shown. The optical path is indicated by a solid line and an arrow. The portion of the boundary surface of the irradiation lens 12 that is included in the range in which the light beam reflected by the reflecting mirror 13 is incident forms a straight line inclined with respect to the optical axis in the cross section including the optical axis, and is an outgoing curved surface. The first inclined surface that intersects the optical axis and the second inclined surface that forms a straight line inclined with respect to the optical axis and intersects the incident curved surface are formed to be convex with respect to the optical axis. Furthermore, an extension of the optical path that exits from the exit curved surface along the inner surface of the boundary surface of the portion formed by the first inclined surface connects either the point on the exit curved surface and the point on the reflective light valve 11 The irradiation lens 12 is arranged with respect to the reflective light valve 11 so as to cross the line segment and pass through the reflective light valve 11. In FIG. 4, the extension line of the optical path is indicated by a broken line.

  Even in the case of this configuration, the light that hits the inner surface of the boundary surface of the portion formed by the first inclined surface among the light included in the light beam incident on the incident curved surface of the irradiation lens 12 is the inner surface of the first inclined surface. The reflective light valve 11 on the opposite side of the outgoing curved surface with respect to the optical path exiting from the outgoing curved surface cannot be closer than the optical path, and passes outside the reflective light valve 11. The light reflected by the boundary surface is prevented from entering the reflective light valve 11. Therefore, in the projector using the irradiation optical unit shown in FIG. 4, it is possible to suppress the occurrence of ghost in the projected image and improve the image quality particularly when projecting a dark image.

  The shape of the irradiation lens 12 shown in FIG. 4 is a shape that can be manufactured using a general mold having a structure in which the irradiation lens 12 is not sandwiched between the exit curved surface side and the incident curved surface side. Therefore, the irradiation lens 12 having this shape is easy to manufacture, and the present invention can be realized at low cost.

  FIG. 5 is a schematic cross-sectional view showing a second other configuration example of the irradiation optical unit of the present invention. In the drawing, a cross section of the reflection type light valve 11 and the irradiation lens 12 in a plane including the optical axis of the irradiation lens 12 is shown. The optical axis of the irradiation lens 12 is indicated by a one-dot chain line, and the light incident on the irradiation lens 12 is shown. The optical path is indicated by a solid line and an arrow. The portion of the boundary surface of the irradiation lens 12 that is included in the range in which the light beam reflected by the reflecting mirror 13 is incident forms a straight line inclined with respect to the optical axis in the cross section including the optical axis, and is an outgoing curved surface. The first inclined surface intersecting the optical axis and the second inclined surface forming a straight line inclined with respect to the optical axis and intersecting the incident curved surface are formed in a concave shape with respect to the optical axis. Furthermore, the extension line of the optical path exiting from the exit curved surface after traveling through the irradiation lens 12 along the inner surface of the boundary surface of the portion formed by the second inclined surface is a point on the exit curved surface and the reflective light valve 11. The irradiation lens 12 is arranged with respect to the reflective light valve 11 so as to intersect any line segment connecting the upper point and pass outside the reflective light valve 11. In FIG. 5, the extension line of the optical path is indicated by a broken line.

  Even in the case of this configuration, the light that hits the inner surface of the boundary surface of the portion formed by the second inclined surface among the light included in the light beam incident on the incident curved surface of the irradiation lens 12 is the inner surface of the second inclined surface. The reflective light valve 11 on the opposite side of the outgoing curved surface with respect to the optical path exiting from the outgoing curved surface cannot be closer than the optical path, and passes outside the reflective light valve 11. The light reflected by the boundary surface is prevented from entering the reflective light valve 11. Therefore, even in the projector using the irradiation optical unit shown in FIG. 5, it is possible to suppress the occurrence of ghost in the projected image and improve the image quality particularly when projecting a dark image.

  In the present embodiment, the irradiation optical unit of the present invention shows a form used for constructing a projector that projects an image onto an external screen or the like. However, the present invention is not limited to this. A rear projection type image display apparatus that includes a screen and projects an image on the screen by projecting the image from the back surface of the screen by the projection optical system 14 may be used.

  Further, in the present embodiment, the irradiation optical unit of the present invention shows a form in which the optical element according to the present invention is a reflection type light valve and is used to constitute a projector, but the present invention is not limited to this. Instead, the optical element according to the present invention may be an optical element other than the reflection type light valve, and the irradiation optical unit according to the present invention may be in a form used to constitute an apparatus other than the projector. For example, the optical element according to the present invention may be an imaging element such as a CCD (Charge Coupuled Device), and the irradiation optical unit of the present invention may be used to configure the imaging apparatus. In this case, it is possible to prevent a ghost from occurring in an image captured by the imaging device.

It is a block diagram which shows the structural example of the optical system of the projector of this invention. It is a typical side view which shows the positional relationship of a reflective light valve, an irradiation lens, and a projection optical system seen from the direction parallel to the reflective surface of a reflective light valve. It is typical sectional drawing which shows the cross section of the reflection type light valve and irradiation lens in the surface containing the optical axis of an irradiation lens. It is typical sectional drawing which shows the 1st other structural example of the irradiation optical unit of this invention. It is typical sectional drawing which shows the 2nd other structural example of the irradiation optical unit of this invention. It is a block diagram which shows a part of optical system of the conventional projector. It is a perspective view which shows the example of the irradiation lens which removed a part. It is typical sectional drawing which shows the cross section of the reflection type light valve and irradiation lens in the surface containing the optical axis of the conventional irradiation lens. It is a schematic diagram which shows the example of the ghost mixed in the image which a projector projects.

Explanation of symbols

1 Projector 11 Reflective light valve (optical element)
DESCRIPTION OF SYMBOLS 12 Irradiation lens 13 Reflector 14 Projection optical system 15 Condensing lens 16 Rod integrator 17 Light source

Claims (5)

In an irradiation optical unit comprising an irradiation lens having an incident curved surface and an outgoing curved surface, and arranged so as to emit a light beam incident on the incident curved surface from the outgoing curved surface and irradiate the optical element,
The irradiation lens is
It is formed in a shape where a part of the convex lens is removed with a boundary surface other than the incident curved surface and the outgoing curved surface as a boundary,
An irradiation optical unit, wherein light reflected by the inner surface of the boundary surface out of the light contained in the light beam incident on the incident curved surface is disposed so as to deviate from the optical element. In an irradiation optical unit comprising an irradiation lens having an incident curved surface and an outgoing curved surface, and arranged so as to emit a light beam incident on the incident curved surface from the outgoing curved surface and irradiate the optical element,
The irradiation lens is formed in a shape in which a part of the convex lens is removed with a boundary surface other than the entrance curved surface and the exit curved surface as a boundary,
At least a part of the boundary surface forms an inclined surface formed so as to form a straight line inclined with respect to the optical axis in a cross section including the optical axis of the irradiation lens,
The extension line of the optical path exiting from the exit curved surface along the inner surface of the inclined surface intersects any line segment connecting the point on the exit curved surface and the point on the optical element, and outside the optical element. An irradiation optical unit, wherein the irradiation lens is disposed so as to pass therethrough. In an irradiation optical unit comprising an irradiation lens having an incident curved surface and an outgoing curved surface, and arranged so as to emit a light beam incident on the incident curved surface from the outgoing curved surface and irradiate the optical element,
The irradiation lens is formed in a shape in which a part of the convex lens is removed with a boundary surface other than the entrance curved surface and the exit curved surface as a boundary,
At least a portion of the boundary surface forms a straight line inclined with respect to the optical axis in a cross section including the optical axis of the irradiation lens, and intersects the outgoing curved surface with respect to the optical axis in the cross section. And a second inclined surface that intersects with the incident curved surface and forms a straight line that is inclined with respect to the optical axis,
An extension line of the optical path exiting from the exit curved surface along the inner surface of the first inclined surface intersects any line segment connecting a point on the exit curved surface and a point on the optical element, and the optical element An irradiation optical unit, wherein the irradiation lens is disposed so as to pass outside. In an irradiation optical unit comprising an irradiation lens having an incident curved surface and an outgoing curved surface, and arranged so as to emit a light beam incident on the incident curved surface from the outgoing curved surface and irradiate the optical element,
The irradiation lens is formed in a shape in which a part of the convex lens is removed with a boundary surface other than the entrance curved surface and the exit curved surface as a boundary,
At least a portion of the boundary surface forms a straight line inclined with respect to the optical axis in a cross section including the optical axis of the irradiation lens, and intersects the outgoing curved surface with respect to the optical axis in the cross section. And a second inclined surface that intersects the incident curved surface and forms a straight line that is inclined with respect to the optical axis,
An extension line of the optical path exiting from the exit curved surface along the inner surface of the second inclined surface intersects any line segment connecting a point on the exit curved surface and a point on the optical element, and the optical element An irradiation optical unit, wherein the irradiation lens is disposed so as to pass outside. An irradiation optical unit according to any one of claims 1 to 4,
The optical element included in the irradiation optical unit is a reflective light valve that reflects the irradiated light and generates an image composed of reflected light,
Furthermore, a light source that generates light incident on an irradiation lens included in the irradiation optical unit;
A projector for projecting an image generated by the optical element to the outside.

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