JP2018124350A - Image projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image projection device with which it is possible to improve the quality of a displayed image when displaying the image on a screen, the aspect ratio of which is different from the aspect ratio of an image projected by a projector.SOLUTION: An image projection device 10 comprises a light source unit 300 for irradiating light that forms an image, a scanning unit 106 for scanning the light irradiated by the light source unit 200, and a reflection unit 200 for guiding the light scanned by the scanning unit 106 to a prescribed area 20. The reflection unit 200 includes a first, a second and a third reflection unit 200a-200c, the first reflection unit 200a being arranged adjacent to the second reflection unit 200b in a first direction that intersects the incident direction of light, the third reflection unit 200c being arranged in a second direction that intersects the first direction with respect to the first reflection unit 200a, the first to third reflection units 200a-200c respectively guiding incident light to a first area 20a, a second area 20b and a third area 20c located on a line in the prescribed area 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an image projection apparatus that projects an image by scanning light.

  Conventional projectors are designed to project an image on a screen or the like with a predetermined aspect ratio. As the predetermined aspect ratio, 4: 3 or 16: 9 is often used. However, in recent years, in digital signage and the like, unlike conventional aspect ratios, it may be required to project an image with a horizontally long aspect ratio (for example, 16: 3).

  Patent Document 1 discloses a technique for realizing a display of a large image having a shape different from an image area projected by a projector with a simple structure. In Patent Document 1, an image in which a plurality of partial images arranged in either the vertical direction or the horizontal direction are independently reflected, and one image adjacent in a direction different from the arrangement direction of the plurality of partial images is displayed on the screen. A projection system is disclosed.

JP 2012-181534 A

  However, in the technique of Patent Document 1, there is a case where distortion of images displayed on both ends of the screen increases.

  Therefore, the present invention provides an image projection apparatus capable of improving the image quality of an image to be formed when an image having an aspect ratio different from that of an image projected by a projector is formed in a predetermined area.

  An image projection apparatus according to an aspect of the present invention includes a light source unit that emits light that forms an image, a scanning unit that scans light emitted from the light source unit, and light that is scanned by the scanning unit. A reflecting portion that leads to a region, wherein the reflecting portion includes first, second, and third reflecting portions, and the first reflecting portion is arranged in a first direction that intersects an incident direction of light. The third reflecting portion is disposed in a second direction orthogonal to the first direction with respect to the first reflecting portion, and the first to third reflecting portions are disposed adjacent to the second reflecting portion. The incident light is guided to the first region, the second region, and the third region, which are positioned in a row on the predetermined region.

  According to this configuration, the first reflection unit and the second reflection unit adjacent to each other in the first direction, and the third reflection unit disposed in the second direction orthogonal to the first direction with respect to the first reflection unit. The incident light can be guided to the first region, the second region, and the third region located in a line. In this way, by guiding light to a region suitable for each of the first to third reflection units, it is possible to reduce distortion of an image formed in a predetermined region and improve image quality.

  For example, the first region and the second region may be separated from each other, and the third region may be located between the first region and the second region.

  According to this configuration, the third region can be disposed between the first region and the second region, and image distortion can be further reduced.

  Further, for example, the first to third reflecting portions may be arranged at a predetermined angle with respect to the incident light, and form an image in the predetermined region.

  In addition, for example, the reflection unit further includes a fourth reflection unit, and the fourth reflection unit is a fourth region in which incident light is aligned with the first region, the second region, and the third region. You may lead to.

  Further, for example, each of the reflection units may be disposed on a light path between the light source unit and the predetermined region, and may reflect incident light to the predetermined region.

  According to this configuration, the incident light can be reflected to the predetermined region by the respective reflection units arranged on the light path between the light source unit and the predetermined region.

  Further, for example, each of the reflection units may be disposed on a light path between the light source unit and the predetermined region, and may transmit incident light and guide it to the predetermined region.

  According to this configuration, the incident light can be transmitted to the predetermined region by the respective reflection units arranged on the light path between the light source unit and the predetermined region. Therefore, the light source unit, the light guide unit, and the predetermined region can be arranged substantially linearly, and the image projection apparatus can be downsized.

  Further, for example, at least one of the first to third reflecting units is disposed on a light path between the light source unit and the predetermined region, and reflects incident light to the predetermined region. And at least one other of the first to third reflecting portions is disposed on a light path between the light source portion and the screen, and transmits incident light to the predetermined region. It may be emitted.

  According to this configuration, it is possible to transmit or reflect the incident light to the predetermined region at an appropriate angle by the respective reflection units arranged on the light path between the light source unit and the predetermined region.

  These comprehensive or specific modes may be realized by a system, a method, an integrated circuit, a computer program, or a recording medium such as a computer-readable CD-ROM. The system, method, integrated circuit, computer program Also, any combination of recording media may be realized.

  The image projection apparatus according to one aspect of the present invention can reduce distortion of an image formed when an image having an aspect ratio different from the aspect ratio of the image projected by the projector is formed in a predetermined region.

FIG. 1 is a perspective view of the image projection apparatus according to the first embodiment. FIG. 2 is a block diagram showing a configuration of the projector according to the first embodiment. FIG. 3 is a plan view of the image projection apparatus according to the first embodiment. FIG. 4 is a cross-sectional view of the image projection apparatus according to the first embodiment. FIG. 5 is a diagram showing an example of an image projected by the projector in the first embodiment. FIG. 6 is a diagram illustrating an example of an image displayed on the screen in the first embodiment. FIG. 7 is a diagram showing scanning lines in a comparative example for explaining the effect of the image projection apparatus according to the first embodiment. FIG. 8 is a diagram illustrating scanning lines in an example for explaining the effects of the image projection apparatus according to the first embodiment. FIG. 9 is a plan view of the image projection apparatus according to the second embodiment. FIG. 10 is a cross-sectional view of the image projection apparatus according to the second embodiment. FIG. 11 is a diagram illustrating an example of an image projected by the projector according to the second embodiment. FIG. 12 is a diagram illustrating an example of an image displayed on the screen by the image projection apparatus according to the second embodiment. FIG. 13 is a diagram showing scanning lines in an example for explaining the effect of the image projection apparatus according to the second embodiment. FIG. 14 is a plan view of the image projection apparatus according to the third embodiment. FIG. 15 is a cross-sectional view of the image projection apparatus according to the third embodiment. FIG. 16 is a diagram illustrating an example of an image projected by the projector according to the third embodiment. FIG. 17 is a diagram illustrating an example of an image displayed on the screen by the image projection apparatus according to the third embodiment. FIG. 18 is a diagram illustrating scanning lines in an example for explaining the effect of the image projection apparatus according to the third embodiment. FIG. 19 is a plan view of an image projection apparatus according to the fourth embodiment. FIG. 20 is a cross-sectional view of the image projection apparatus according to the fourth embodiment. FIG. 21 is a diagram illustrating an example of an image projected by the projector according to the fourth embodiment. FIG. 22 is a diagram illustrating an example of an image displayed on the screen by the image projection apparatus according to the fourth embodiment.

  Hereinafter, embodiments will be specifically described with reference to the drawings.

  It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the scope of the claims. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected about the same structural member. Further, in the following embodiments, expressions such as a substantially Z direction may be used. For example, the substantially Z direction not only means that the direction completely coincides with the Z direction, but also means that the direction substantially coincides, that is, includes a direction deviated from the Z direction by several percent. To do.

  In the following drawings, the horizontal direction and the vertical direction of the screen are defined as the X direction and the Y direction, respectively, and the normal direction of the screen is defined as the Z direction. The X direction is an example of the first direction, and the Y direction is an example of the second direction.

(Embodiment 1)
[Configuration of image projection apparatus]
FIG. 1 is a perspective view of an image projection apparatus 10 according to the first embodiment. The image projection apparatus 10 according to the present embodiment forms an image on the screen 20 by scanning light. As shown in FIG. 1, the image projection device 10 includes a projector 100 and a light guide unit 200.

  Here, the image means an image projected on a photosensitive material, paper, a screen or the like by mechanical processing. Light is a physical cause that causes the human eye to feel brightness and stimulates the eyes to cause vision.

  The projector 100 is a laser scanning projector. Specifically, the projector 100 scans the laser beam and irradiates the light guide unit 200 with the scanned laser beam. In the present embodiment, projector 100 irradiates light in a direction away from screen 20.

  Here, irradiation means applying light or radiation. Further, scanning means an operation of assembling an image by sequentially irradiating light with brightness at each point corresponding to the image.

  The light guide unit 200 is an example of a reflection unit, and guides light emitted from the projector 100 to the screen 20. As shown in FIG. 1, the light guide unit 200 includes four optical members (a first optical member 200a, a second optical member 200b, a third optical member 200c, and a fourth optical member 200d).

  Here, the four optical members are mirrors. Each of the first optical member 200a, the second optical member 200b, the third optical member 200c, and the fourth optical member 200d reflects the light emitted from the projector 100 toward the screen 20.

  The screen 20 is an example of a predetermined area, and is a surface that displays an image with light emitted from the projector 100. As shown in FIG. 1, the screen 20 has four display areas (a first display area 20a, a second display area 20b, a third display area 20c, and a fourth display area 20d) arranged in a line in the X direction.

[Projector configuration]
Next, an example of the configuration of the projector 100 will be described. FIG. 2 is a block diagram showing a configuration of projector 100 according to the first embodiment.

  The projector 100 includes a light source unit 111, a scanning unit 106, a light detection unit 107, a mirror driving unit 108, a light source driving unit 109, and a control unit 110. Hereinafter, each of these components included in the projector 100 will be described.

  The light source unit 111 emits light for forming an image on the screen. The light source unit 111 includes a first light source 101, a second light source 102, a third light source 103, and beam splitters 104 and 105.

  The first light source 101 emits laser light having a predetermined wavelength. Specifically, the first light source 101 is, for example, a laser diode that emits blue laser light. The laser light emitted from the first light source 101 reaches the scanning unit 106 through the beam splitter 104.

  The second light source 102 and the third light source 103 each emit laser light having a wavelength different from that of the laser light emitted from the first light source 101. Specifically, the second light source 102 and the third light source 103 are laser diodes that emit, for example, green laser light and red laser light, respectively. The green laser beam and the red laser beam emitted from the second light source 102 and the third light source 103 reach the scanning unit 106 through the beam splitters 105 and 104.

  The scanning unit 106 is, for example, a biaxial scanning type MEMS mirror unit. The scanning unit 106 scans light in two scanning directions orthogonal to each other. Specifically, the scanning unit 106 scans the laser beam at a high speed in the first scanning direction (for example, the horizontal direction) by swinging the mirror at a high speed about the first axis (for example, the vertical axis) by resonance driving. To do. Further, the scanning unit 106 scans the laser beam in the second scanning direction (for example, the vertical direction) at a low speed by swinging the mirror around the second axis (for example, the horizontal axis) at a low speed by direct current drive.

  The light detection unit 107 detects the light intensity of the laser light emitted from the first light source 101, the second light source 102, and the third light source 103 when the scanning unit 106 scans the laser light in the direction of the light detection unit 107. It is a sensor that detects optical power. The light detection unit 107 is, for example, a photodiode.

  The mirror driving unit 108 swings the mirror of the scanning unit 106 by supplying a driving signal to the scanning unit 106. The mirror driving unit 108 is controlled by the control unit 110.

  The light source driving unit 109 drives each of the first light source 101, the second light source 102, and the third light source 103 by supplying a driving current to each of the first light source 101, the second light source 102, and the third light source 103. . The light source driving unit 109 is controlled by the control unit 110.

  The control unit 110 is realized by, for example, a processor and a memory, or a dedicated electronic circuit. The control unit 110 controls the scanning unit 106 via the mirror driving unit 108 based on the output signal of the light detection unit 107. Specifically, the control unit 110 controls the oscillation of the mirror of the scanning unit 106 and scans the laser light emitted from the first light source 101, the second light source 102, and the third light source 103.

  Further, the control unit 110 controls the light output of the first light source 101, the second light source 102, and the third light source 103 via the light source driving unit 109 based on the input image signal. The control unit 110 controls each of the first light source 101, the second light source 102, and the third light source 103 by controlling the drive current values supplied to the first light source 101, the second light source 102, and the third light source 103, respectively. The light intensity of the laser light emitted from is controlled.

[Arrangement of optical members]
Next, the arrangement of optical members included in the light guide unit 200 of the image projection apparatus 10 will be described. FIG. 3 is a top view of the image projection apparatus 10 according to the first embodiment. FIG. 4 is a cross-sectional view of the image projection apparatus 10 according to the first embodiment. Specifically, FIG. 4 is a sectional view taken along line IV-IV in FIG.

  The 1st optical member 200a is an example of the 1st reflective part, and is a mirror which has the 1st projection field 200ap which reflects light. The first optical member 200 a is disposed on the light path between the projector 100 and the screen 20. The first optical member 200a reflects the light incident on the first projection area 200ap to the first display area 20a. That is, the image projected on the first projection area 200ap is projected on the first display area 20a.

  The 2nd optical member 200b is an example of the 2nd reflective part, and is a mirror which has the 2nd projection field 200bp which reflects light. The second optical member 200 b is disposed on the light path between the projector 100 and the screen 20. The second optical member 200b is disposed adjacent to the first optical member 200a in the X direction that intersects the incident direction of light to the second projection region 200bp (here, approximately the Z direction).

  The second optical member 200b reflects the light incident on the second projection area 200bp to the second display area 20b. That is, the second optical member 200b reflects the light incident on the second projection area 200bp to the second display area 20b that is separated from the first display area 20a. That is, the image projected on the second projection area 200bp is projected on the second display area 20b.

  Therefore, the mirror surface having the second projection region 200bp faces in a different direction from the mirror surface having the first projection region 200ap. Specifically, the mirror surface having the second projection region 200bp and the surface having the first projection region 200ap are connected in a mountain shape having a vertex on the screen 20 side as viewed from the Y direction, and in the X direction. The light is reflected in directions away from each other.

  The third optical member 200c is an example of a third reflecting portion, and is a mirror having a third projection region 200cp that reflects light. The third optical member 200 c is disposed on the light path between the projector 100 and the screen 20. The third optical member 200c is disposed adjacent to the second optical member 200b in the light incident direction (substantially Z direction here) to the third projection region 200cp and in the Y direction orthogonal to the X direction. The third optical member 200c reflects the light incident on the third projection region 200cp to the third display region 20c located between the first display region 20a and the second display region 20b. That is, the image projected on the third projection area 200cp is projected on the third display area 20c.

  The fourth optical member 200d is an example of a fourth reflecting portion, and is a mirror having a fourth projection region 200dp that reflects light. The fourth optical member 200d is disposed on the light path between the projector 100 and the screen 20. The fourth optical member 200d is disposed adjacent to the second optical member 200b in the X direction, and is disposed adjacent to the first optical member 200a in the Y direction. The fourth optical member 200d is a fourth display region 20d that is located between the first display region 20a and the second display region 20b and that is adjacent to the third projection region 200cp. Reflect on. That is, the image projected on the fourth projection area 200dp is projected on the fourth display area 20d.

  As described above, the first projection area 200ap, the second projection area 200bp, the third projection area 200cp, and the fourth projection area 200dp are arranged in a matrix and reflect light in different directions. Specifically, the first projection region 200ap is adjacent to the second projection region 200bp in the X direction and is adjacent to the fourth projection region 200dp in the Y direction. The third projection region 200cp is adjacent to the fourth projection region 200dp in the X direction and is adjacent to the second projection region 200bp in the Y direction.

  Note that the size of each projection area is determined by the distance between the projector 100 and the mirror surface of each optical member and the scanning angle of the projector 100. For example, when the distance between the projector and each mirror surface is represented by L, the horizontal scanning angle is represented by α, and the vertical scanning angle is represented by β, the size of the horizontal mirror surface is 2Ltanα, and the vertical mirror The size of the surface is 2L tan β.

[Relationship between projected image and display image]
Here, the relationship between an image (hereinafter referred to as a projected image) formed on the projection area of the light guide unit 200 by the projector 100 and an image (hereinafter referred to as a display image) formed on the screen 20 will be described. FIG. 5 is a diagram showing an example of the projected image 30A in the first embodiment. FIG. 6 is a diagram showing an example of the display image 30B in the first embodiment.

  By the light irradiated from the projector 100, the first partial image 30a, the second projection area 200bp, the third projection area 200cp, and the fourth projection area 200dp of the light guide unit 200 are respectively applied to the first projection area 200ap, the second projection area 200bp, the third projection area 200cp, and the fourth projection area 200dp. A partial image 30b, a third partial image 30c, and a fourth partial image 30d are formed. The first partial image 30a, the second partial image 30b, the third partial image 30c, and the fourth partial image 30d are arranged in a matrix in the X direction and the Y direction to form a projection image 30A. The projected image 30A has a conventional aspect ratio (for example, 4: 3 or 16: 9).

  The first partial image 30a and the second display region 20d of the first display area 20a, the second display area 20b, the third display area 20c, and the fourth display area 20d of the screen 20 are reflected by the light reflected from the light guide unit 200, respectively. A partial image 30b, a third partial image 30c, and a fourth partial image 30d are formed. The first partial image 30a, the second partial image 30b, the third partial image 30c, and the fourth partial image 30d are arranged in a line in the X direction to form a display image 30B. The display image 30B has an aspect ratio different from the aspect ratio of the projection image 30A, and here has a more horizontally long aspect ratio (for example, 16: 3 or 64: 9).

  Here, the first partial image 30a and the second partial image 30b are adjacent to each other in the X direction in the projection image 30A, but are separated from each other in the X direction in the display image 30B. In the display image 30B, the third partial image 30c and the fourth partial image 30d are located between the first partial image 30a and the second partial image 30b. Specifically, in the display image 30B, the second partial image 30b, the third partial image 30c, the fourth partial image 30d, and the first partial image 30a are arranged in this order in the X direction.

[effect]
As described above, according to the image projection apparatus 10 according to the present embodiment, the first display region 20a and the second display that separate the light incident on the first projection region 200ap and the second projection region 200bp adjacent to each other. Guided to the region 20b, the light incident on the third projection region 200cp and the fourth projection region 200dp is guided to the third display region 20c and the fourth display region 20d located between the first display region 20a and the second display region 20b. be able to. In this way, by guiding light to a display area suitable for each of the four projection areas, distortion of the displayed image can be reduced, and image quality can be improved.

  This effect will be described with reference to FIGS. FIG. 7 is a diagram showing scanning lines in a comparative example for explaining the effect of the image projection apparatus 10 according to the first embodiment. FIG. 8 is a diagram showing scanning lines in an example for explaining the effect of the image projection apparatus 10 according to the first embodiment.

  7 and 8, the vertical axis indicates the position in the vertical direction on the screen, and the horizontal axis indicates the position in the horizontal direction on the screen. The lines drawn in FIGS. 7 and 8 indicate the trajectories of light rays scanned on the screen (hereinafter referred to as scanning lines). This scanning line was obtained by simulation. Moreover, the rectangle drawn in FIG.7 and FIG.8 shows the display area on a screen.

  In the comparative example of FIG. 7, as described in Patent Document 1, light incident on two projection areas arranged in the vertical direction is reflected on two display areas arranged in the horizontal direction.

  On the other hand, in the embodiment of FIG. 8, as described above, the light incident on the four projection areas arranged in a matrix is divided into four display areas arranged in the horizontal direction (first display area 20a and second display area 20b). The third display area 20c and the fourth display area 20d) are reflected. The distance from the projector 100 to each optical member is about 50 mm. Further, the mirror surface on which the first projection area 200ap and the second projection area 200bp are formed is inclined by 14.2 degrees in the X direction. The mirror surfaces on which the third projection region 200cp and the fourth projection region 200dp are formed are inclined by 2.7 degrees in the X direction and 17 degrees in the Y direction, respectively.

  In FIG. 7, it can be seen that the inclination of the scanning line with respect to the horizontal direction is large, and the distortion of the image displayed on the screen is also large. In FIG. 7, there is an area where light is not scanned at the lower left of the display area indicated by a rectangle. On the other hand, in FIG. 8, it can be seen that the inclination of the scanning line with respect to the horizontal direction is small, light is uniformly scanned in the display area, and the distortion of the image displayed on the screen is small. That is, in FIG. 8, the image quality of the image displayed on the screen is improved as compared with FIG.

(Embodiment 2)
Next, a second embodiment will be described. The second embodiment is mainly different from the first embodiment in that images are displayed in three display areas using three projection areas. In the following, the present embodiment will be described focusing on differences from the first embodiment.

[Arrangement of optical members]
First, the arrangement of optical members included in the image projector 11 will be described. FIG. 9 is a top view of the image projection apparatus 11 according to the second embodiment. FIG. 10 is a cross-sectional view of the image projection apparatus 11 according to the second embodiment. Specifically, FIG. 10 is a sectional view taken along line XX in FIG.

  In the present embodiment, projector 100 irradiates light in a direction approaching screen 20. As shown in FIGS. 9 and 10, the light guide unit 201 includes a first optical member 201a, a second optical member 201b, a third optical member 201c, and a fourth optical member 201d.

  The first optical member 201a is a mirror having a first projection region 201ap that reflects light. The first optical member 201 a is disposed on the light path between the projector 100 and the screen 20. The first optical member 201a reflects the light incident on the first projection area 201ap to the first display area 21a.

  The second optical member 201b is a mirror having a second projection region 201bp that reflects light. The second optical member 201 b is disposed on the light path between the projector 100 and the screen 20. The second optical member 201b is disposed adjacent to the first optical member 201a in the X direction that intersects the incident direction of light to the second projection region 201bp (here, approximately the Z direction). The second optical member 201b reflects the light incident on the second projection area 201bp to the second display area 21b that is separated from the first display area 21a.

  The third optical member 201c is a mirror having a third projection region 201cp that reflects light. The third optical member 201 c is disposed on the light path between the projector 100 and the screen 20. In addition, the third optical member 201c is adjacent to the first optical member 201a and the second optical member 201b in the light incident direction (substantially Z direction here) to the third projection region 201cp and the Y direction intersecting the X direction. Are arranged. The third optical member 201c reflects the light incident on the third projection region 201cp to the third display region 21c located between the first display region 21a and the second display region 21b.

  As described above, the second projection region 201bp is adjacent to the first projection region 201ap in the X direction, and the third projection region 201cp is adjacent to the first projection region 201ap and the second projection region 201bp in the Y direction. ing.

  The fourth optical member 201d is a mirror that reflects light. The fourth optical member 201d is disposed on the light path between the projector 100 and the first optical member 201a, the second optical member 201b, and the third optical member 201c. The fourth optical member 201d reflects the light emitted from the projector 100 to the first projection area 201ap, the second projection area 201bp, or the third projection area 201cp according to the incident position of the light on the fourth optical member 201d. .

[Relationship between projected image and display image]
Here, the relationship between the projection image formed on the projection region of the light guide unit 201 by the projector 100 and the display image formed on the screen 20 will be described. FIG. 11 is a diagram illustrating an example of the projection image 31A in the first embodiment. FIG. 12 is a diagram illustrating an example of the display image 31B in the first embodiment.

  By the light emitted from the projector 100, the first partial image 31a, the second partial image 31b, and the third partial image are respectively formed in the first projection region 201ap, the second projection region 201bp, and the third projection region 201cp of the light guide unit 201. A partial image 31c is formed. The first partial image 31a, the second partial image 31b, and the third partial image 31c are adjacent to each other in the X direction and the Y direction, and form a projection image 31A. The projected image 31A has a conventional aspect ratio (for example, 4: 3 or 16: 9).

  Due to the light reflected from the light guide unit 201, the first partial image 31a, the second partial image 31b, and the third partial image are respectively displayed in the first display area 21a, the second display area 21b, and the third display area 21c of the screen 20. A partial image 31c is formed. The first partial image 31a, the second partial image 31b, and the third partial image 31c are arranged in a line to form a display image 31B. The display image 31B has an aspect ratio different from the aspect ratio of the projection image 31A, and here has a more horizontally long aspect ratio.

  The first partial image 31a and the second partial image 31b are adjacent to each other in the X direction in the projection image 31A, but are separated from each other in the X direction in the display image 31B. In the display image 31B, the third partial image 31c is located between the first partial image 31a and the second partial image 31b. Specifically, in the display image 31B, the second partial image 31b, the third partial image 31c, and the first partial image 31a are arranged in the X direction in this order.

[effect]
As described above, according to the image projection apparatus 11 according to the present embodiment, the light incident on the first projection area 201ap and the second projection area 201bp adjacent to each other is separated from the first display area 21a and the second display area 21a. The display area 21b can be led, and the third display area 21c can be arranged between the first display area 21a and the second display area 21b. In this way, by guiding light to a display area suitable for each of the three projection areas, distortion of the displayed image can be reduced, and image quality can be improved.

  This effect will be described with reference to FIG. FIG. 13 is a diagram illustrating scanning lines in an example for explaining the effect of the image projection apparatus 11 according to the second embodiment.

  In FIG. 13, the vertical axis indicates the vertical position on the screen, and the horizontal axis indicates the horizontal position on the screen. And the line drawn in FIG. 13 shows a scanning line. This scanning line was obtained by simulation. A rectangle drawn in FIG. 13 indicates a display area on the screen.

  In the embodiment of FIG. 13, as described above, the light incident on the three projection areas is applied to the three display areas (first display area 21a, second display area 21b, and third display area 21c) arranged in the horizontal direction. Reflected or transmitted. The distance from the projector 100 to each optical member is about 50 mm. Further, the mirror surface on which the first projection area 201ap and the second projection area 201bp are formed is inclined by 12.4 degrees in the X direction and 18.3 degrees in the Y direction.

  In FIG. 13, it can be seen that the inclination of the scanning line with respect to the horizontal direction is small, light is uniformly scanned in the display area, and distortion of images displayed on both ends of the screen is reduced. That is, in FIG. 13, the image quality of the images displayed at both ends of the screen is improved as compared with FIG.

(Embodiment 3)
Next, Embodiment 3 will be described. The third embodiment is mainly different from the first and second embodiments in that the third optical member transmits light and guides the light to the screen. In the following, the present embodiment will be described focusing on differences from the first and second embodiments.

[Arrangement of optical members]
First, the arrangement of optical members included in the image projection device 12 will be described. FIG. 14 is a top view of the image projection apparatus 12 according to the third embodiment. FIG. 15 is a cross-sectional view of the image projection apparatus 12 according to the third embodiment. Specifically, FIG. 15 is a cross-sectional view taken along line XIV-XIV in FIG.

  In the present embodiment, projector 100 irradiates light in a direction approaching screen 20. As shown in FIGS. 14 and 15, the light guide unit 202 includes a first optical member 202a, a second optical member 202b, a third optical member 202c, and a fourth optical member 202d.

  The first optical member 202a is a mirror having a first projection region 202ap that reflects light. The first optical member 202a is disposed on the light path between the projector 100 and the screen 20, and reflects the light incident on the first projection area 202ap to the first display area 21a.

  The second optical member 202b is a mirror having a second projection region 202bp that reflects light. The second optical member 202 b is disposed on the light path between the projector 100 and the screen 20. The second optical member 202b is disposed adjacent to the first optical member 202a in the X direction that intersects the incident direction of light to the second projection region 202bp (here, approximately the Z direction). The second optical member 202b reflects the light incident on the second projection area 202bp to the second display area 21b. That is, the second optical member 202b reflects the light incident on the second projection area 202bp to the second display area 21b that is separated from the first display area 21a.

  The third optical member 202c is a lens having a third projection region 202cp that transmits light. The third optical member 202 c is disposed on the light path between the projector 100 and the screen 20. The third optical member 202c transmits the light incident on the third projection region 202cp and emits the light to the third display region 21c located between the first display region 21a and the second display region 21b.

  The fourth optical member 202d is a mirror that reflects light. The fourth optical member 202d is disposed on the light path between the projector 100 and the first optical member 202a and the second optical member 202b. The fourth optical member 202d is disposed adjacent to the third optical member 202c in the Y direction, and the light irradiated from the projector 100 is changed into the first projection region 202ap according to the incident position of the light on the fourth optical member 202d. Or it reflects in the 2nd projection field 202bp.

[Relationship between projected image and display image]
Here, the relationship between the projection image formed on the projection area of the light guide unit 202 by the projector 100 and the display image formed on the screen 20 will be described. FIG. 16 is a diagram illustrating an example of a projection image 32A in the third embodiment. FIG. 17 is a diagram illustrating an example of the display image 32B in the third embodiment.

  By the light irradiated from the projector 100, the first partial image 32a, the second partial image 32b, and the third partial image are respectively formed in the first projection region 202ap, the second projection region 202bp, and the third projection region 202cp of the light guide unit 202. A partial image 32c is formed. The first partial image 32a, the second partial image 32b, and the third partial image 32c form a projection image 32A. The projection image 32A has a conventional aspect ratio (for example, 4: 3 or 16: 9).

  Due to the light reflected from the light guide unit 201, the first partial image 32a, the second partial image 32b, and the third partial image are respectively displayed in the first display region 21a, the second display region 21b, and the third display region 21c of the screen 20. A partial image 32c is formed. The first partial image 32a, the second partial image 32b, and the third partial image 32c are arranged in a line to form a display image 32B. The display image 32B has an aspect ratio different from the aspect ratio of the projection image 32A, and here has a more horizontally long aspect ratio.

  The first partial image 32a and the second partial image 32b are adjacent to each other in the projection image 32A, but are separated from each other in the display image 32B. In the display image 32B, the third partial image 32c is located between the first partial image 32a and the second partial image 32b. Specifically, in the display image 32B, the second partial image 32b, the third partial image 32c, and the first partial image 32a are arranged in this order.

[effect]
As described above, according to the image projecting device 12 according to the present embodiment, the light incident on the three projection regions is obtained by the three optical members arranged on the light path between the light source unit and the screen. The three display areas can be transmitted or reflected at an appropriate angle.

  This effect will be described with reference to FIG. FIG. 18 is a diagram illustrating scanning lines in an example for explaining the effect of the image projection device 12 according to the third embodiment.

  In FIG. 18, the vertical axis indicates the vertical position on the screen, and the horizontal axis indicates the horizontal position on the screen. And the line drawn in FIG. 18 shows a scanning line. This scanning line was obtained by simulation. A rectangle drawn in FIG. 18 indicates a display area on the screen.

  In the embodiment of FIG. 18, as described above, the light incident on the three projection areas is applied to the three display areas (first display area 22a, second display area 22b, and third display area 22c) arranged in the horizontal direction. Reflected or transmitted. The distance from the projector 100 to each optical member is about 50 mm. Further, the mirror surface on which the first projection area 202ap and the second projection area 202bp are formed is inclined by 12.4 degrees in the X direction and 18.3 degrees in the Y direction.

  In FIG. 18, it can be seen that the inclination of the scanning line with respect to the horizontal direction is small, light is uniformly scanned in the display area, and distortion of the image displayed on the screen is reduced. That is, in FIG. 18, the image quality of the image displayed on the screen is improved as compared with FIG.

(Embodiment 4)
Next, a fourth embodiment will be described. The fourth embodiment is mainly different from the first to third embodiments in that each optical member transmits light and guides the light to the screen. In the following, the present embodiment will be described focusing on differences from the first to third embodiments.

[Arrangement of optical members]
First, the arrangement of optical members included in the image projector 13 will be described. FIG. 19 is a top view of the image projection apparatus 13 according to the fourth embodiment. FIG. 20 is a cross-sectional view of the image projection apparatus 13 according to the fourth embodiment. Specifically, FIG. 20 is a cross-sectional view taken along line XIX-XIX in FIG.

  In the present embodiment, projector 100 irradiates light in a direction approaching screen 20. The light guide unit 203 includes a first optical member 203a, a second optical member 203b, and a third optical member 203c.

  The first optical member 203a is a lens having a first projection region 203ap that transmits light. Specifically, the first optical member 203a is, for example, a wedge prism that deflects light by refraction. The first optical member 203a is disposed on the light path between the projector 100 and the screen 20, and transmits the light incident on the first projection area 203ap and emits it toward the first display area 21a.

  The second optical member 203b is a lens having a second projection region 203bp that transmits light. Specifically, the second optical member 203b is, for example, a prism that changes the traveling direction of light by refraction. The second optical member 203 b is disposed on the light path between the projector 100 and the screen 20. The second optical member 203b is disposed adjacent to the first optical member 203a in the X direction that intersects the incident direction of light to the second projection region 203bp (here, approximately the Z direction). The second optical member 203b transmits the light incident on the second projection region 203bp and emits the light toward the second display region 21b. That is, the second optical member 203b emits the light incident on the second projection region 203bp to the second display region 21b that is separated from the first display region 21a.

  The third optical member 203c is a lens having a third projection region 203cp that transmits light. Specifically, the third optical member 203c is, for example, a prism that changes the traveling direction of light by refraction. The third optical member 203 c is disposed on the light path between the projector 100 and the screen 20. The third optical member 203c is adjacent to the first optical member 203a and the second optical member 203b in the light incident direction (substantially Z direction here) to the third projection region 203cp and in the Y direction intersecting the X direction. Are arranged. The third optical member 203c transmits the light incident on the third projection area 203cp and emits the light to the third display area 21c located between the first display area 21a and the second display area 21b.

[Relationship between projected image and display image]
Here, the relationship between the projection image formed on the projection area of the light guide unit 203 by the projector 100 and the display image formed on the screen 20 will be described. FIG. 21 is a diagram showing an example of the projection image 33A in the third embodiment. FIG. 22 is a diagram illustrating an example of the display image 33B in the third embodiment.

  By the light emitted from the projector 100, the first partial image 33a, the second partial image 33b, and the third partial image are respectively formed in the first projection region 203ap, the second projection region 203bp, and the third projection region 203cp of the light guide unit 203. A partial image 33c is formed. The first partial image 33a, the second partial image 33b, and the third partial image 33c form a projection image 33A. The projection image 33A has a conventional aspect ratio (for example, 4: 3 or 16: 9).

  The first partial image 33a, the second partial image 33b, and the third partial area are respectively formed in the first display area 21a, the second display area 21b, and the third display area 21c of the screen 20 by the light transmitted through the light guide unit 201. An image 33c is formed. The first partial image 33a, the second partial image 33b, and the third partial image 33c are arranged in a line to form a display image 33B. The display image 33B has an aspect ratio different from the aspect ratio of the projection image 33A, and here has a more horizontally long aspect ratio.

  The first partial image 33a and the second partial image 33b are adjacent to each other in the X direction in the projection image 33A, but are separated from each other in the X direction in the display image 33B. In the display image 33B, the third partial image 33c is located between the first partial image 33a and the second partial image 33b. Specifically, in the display image 33B, the second partial image 33b, the third partial image 33c, and the first partial image 33a are arranged in this order in the X direction.

[effect]
As described above, according to the image projection apparatus 13 according to the present embodiment, the light is incident on the three projection areas by the three optical members arranged on the light path between the light source unit 111 and the screen 20. Light can be transmitted through the three display areas at an appropriate angle. Therefore, the light source unit 111, the light guide unit 200, and the screen 20 can be arranged linearly, and the image projector 13 can be downsized.

(Other embodiments)
As described above, the image projection apparatus according to one or more aspects of the present invention has been described based on the embodiment. However, the present invention is not limited to this embodiment. Unless it deviates from the gist of the present invention, one or more of the present invention may be applied to various modifications that can be conceived by those skilled in the art, or forms constructed by combining components in different embodiments. It may be included within the scope of the embodiments.

  For example, in the second embodiment, the fourth optical member is used. However, similarly to the first embodiment, light is directly emitted from the projector 100 to the first optical member, the second optical member, and the third optical member. May be irradiated.

  In the above embodiments, the plurality of display areas are arranged in the horizontal direction, but the present invention is not limited to this. For example, the plurality of display areas may be arranged in the vertical direction.

  In the above embodiments, a plurality of optical members are used. However, the plurality of optical members may be integrally formed. For example, in the fourth embodiment, the three optical members may be formed as a single optical member having a plurality of regions having different optical characteristics.

  In each of the above embodiments, the projector and the light guide are provided separately. However, the light guide may be built in the housing of the projector.

  In each of the above embodiments, the case where the predetermined area where the image is formed is a screen has been described, but the predetermined area is not limited to the screen. For example, the predetermined area may be a photosensitive material or paper.

  The present invention can be used as an image projection apparatus that displays an image with an aspect ratio different from the aspect ratio of the image projected by the projector on the screen.

10, 11, 12, 13 Image projector 20 Screen (predetermined area)
20a, 21a First display area (first area)
20b, 21b Second display area (second area)
20c, 21c Third display area (third area)
20d Fourth display area (fourth area)
30A, 31A, 32A, 33A Projected image 30B, 31B, 32B, 33B Display image 30a, 31a, 32a, 33a First partial image 30b, 31b, 32b, 33b Second partial image 30c, 31c, 32c, 33c Third portion Image 30d Fourth partial image 100 Projector 101 First light source 102 Second light source 103 Third light source 104, 105 Beam splitter 106 Scanning unit 107 Photodetection unit 108 Mirror driving unit 109 Light source driving unit 110 Control unit 111 Light source unit 200, 201, 202, 203 Light guide part (reflection part)
200a, 201a, 202a, 203a 1st optical member (1st reflection part)
200ap, 201ap, 202ap, 203ap 1st projection area 200b, 201b, 202b, 203b 2nd optical member (2nd reflection part)
200 bp, 201 bp, 202 bp, 203 bp Second projection area 200 c, 201 c, 202 c, 203 c Third optical member (third reflecting portion)
200 cp, 201 cp, 202 cp, 203 cp Third projection area 200 d, 201 d, 202 d Fourth optical member (fourth reflecting portion)
200dp fourth projection area

Claims (7)

A light source unit that emits light for forming an image;
A scanning unit that scans the light emitted from the light source unit;
A reflection part for guiding the light scanned by the scanning part to a predetermined region,
The reflective portion includes first, second, and third reflective portions,
The first reflection unit is disposed adjacent to the second reflection unit in a first direction intersecting a light incident direction,
The third reflecting portion is disposed in a second direction orthogonal to the first direction with respect to the first reflecting portion,
The first to third reflectors guide incident light to a first area, a second area, and a third area, respectively, which are positioned in a row on the predetermined area.
Image projection device. The first region and the second region are separated from each other, and the third region is located between the first region and the second region.
The image projection apparatus according to claim 1. The first to third reflectors are arranged at a predetermined angle with respect to the incident light, and form an image in the predetermined area.
The image projection device according to claim 1. The reflection unit further includes a fourth reflection unit, and the fourth reflection unit guides incident light to a fourth region aligned with the first region, the second region, and the third region.
The image projection apparatus according to claim 1. Each of the reflection units is disposed on a light path between the light source unit and the predetermined region, and reflects incident light to the predetermined region.
The image projection apparatus according to claim 1. Each of the reflecting units is disposed on a light path between the light source unit and the predetermined region, transmits incident light, and guides the light to the predetermined region.
The image projection apparatus according to claim 1. At least one of the first to third reflection units is disposed on a light path between the light source unit and the predetermined region, and reflects incident light to the predetermined region.
At least one other of the first to third reflectors is disposed on a light path between the light source unit and the screen, and transmits incident light to be emitted to the predetermined region. To
The image projection apparatus according to claim 1.