JP2010072421A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology for extending a range of installing a projector which performs video adjustment based on a captured image. <P>SOLUTION: The projector 10 includes: a color separation and synthesis optical system 20 which generates projection light RP; a projection lens unit 30 which projects the projection light RP to a screen 80; imaging sensors 182 and 184 which are provided respectively across an optical axis AP of the projection light RP to image the screen 80; and a video adjusting part 114 which adjusts a video image projected to the screen 80 on the basis of the image captured by the imaging sensors 182 and 184. The imaging sensors 182 and 184 incline with respect to the optical axis AP of the projection light RP. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projector (projection device) that projects an image on a screen.

  In the projector, image adjustment processing such as trapezoidal distortion correction, focus adjustment, and enlargement / reduction (zoom) adjustment is performed to adjust the image projected on the screen. 2. Description of the Related Art Conventionally, there has been known a projector in which an imaging sensor that images a screen is arranged next to a projection lens unit that projects projection light onto the screen, and an image projected on the screen is adjusted based on a captured image captured by the imaging sensor. (Patent Document 1).

Japanese Patent No. 3880582

  However, in the conventional technology, in a situation where the projector and the screen are close to each other, the imaging area on the screen that can be photographed by the imaging sensor is narrowed, and a captured image for use in video adjustment processing may not be sufficiently obtained. There was a problem.

  In view of the above-described problems, an object of the present invention is to provide a technique capable of extending the installation range of a projector capable of performing video adjustment processing based on a captured image.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to Application Example 1 is a projector that projects an image on a screen, the projection optical system that generates projection light that represents the image, and the projection light that is generated by the projection optical system. A projection lens unit in which a plurality of lenses for projecting onto the screen are arranged, and a first and a first image capturing the screen, each provided at a position sandwiching a projection optical axis that is an optical axis of projection light from the projector toward the screen. A second imaging sensor; and a projection adjustment unit that adjusts an image projected on the screen based on captured images captured by the first and second imaging sensors, the first and second The optical axis of at least one of the imaging sensors tends to the projection optical axis. According to the projector of Application Example 1, the imaging region of the imaging sensor can be expanded in a direction that tends to the projection optical axis. As a result, it is possible to extend the installation range of the projector that can perform the video adjustment process based on the captured image.

  Application Example 2 In the projector according to Application Example 1, the optical axis that tends to the projection optical axis among the optical axes in the first and second imaging sensors intersects the projection optical axis before the screen. It is also good. According to the projector of the application example 2, the imaging region by the imaging sensor can be further expanded in a direction that tends to the projection optical axis.

  Application Example 3 In the projector according to Application Example 1 or Application Example 2, each imaging region in which the first and second imaging sensors can capture the screen may overlap at least partially. According to the projector of Application Example 3, it is possible to improve the imaging accuracy in the overlapping area where the imaging areas overlap.

  Application Example 4 In the projector according to Application Example 1 or Application Example 2, the imaging regions in which the first and second imaging sensors can capture the screen may be separated from each other. According to the projector of the application example 4, the imaging area can be further expanded.

  Application Example 5 In the projector according to Application Example 1 or Application Example 2, the projector further changes an angle at which at least one of the first and second imaging sensors tends to the projection optical axis. A change unit may be provided. According to the projector of Application Example 5, the imaging region by the imaging sensor can be enlarged or reduced according to the content of the video adjustment process based on the captured image.

  Application Example 6 In the projector according to any one of Application Examples 1 to 5, the projector further includes a main body housing that accommodates at least a part of the projection optical system and the projection lens unit. A main body housing having a rear end portion facing back may be provided, and the first and second imaging sensors may be provided in a position closer to the rear end portion than the projection lens unit in the main body housing. . According to the projector of Application Example 6, since the imaging sensor can be provided at a position further away from the screen, the imaging area of the imaging sensor can be further expanded.

  Application Example 7 In the projector according to Application Example 6, the imaging sensor is provided on one of a plurality of surfaces constituting the outer surface of the main body housing, and the rear end portion among the edge portions on the surface is provided. It may be located along the near edge. According to the projector of Application Example 7, the imaging sensor can be provided at a position further away from the screen.

  Application Example 8 In the projector according to Application Example 6 or Application Example 7, the imaging sensor is one of a plurality of surfaces constituting the outer surface of the main body housing, and is projected onto the screen. It may be provided on a surface provided with a discharge port for discharging the. According to the projector of Application Example 8, since the surface on which the discharge port is provided faces the screen, the imaging sensor can be provided at a position where the imaging area can be easily aligned with the screen.

  Application Example 9 In the projector according to Application Example 6 or Application Example 7, the imaging sensor is one of a plurality of surfaces constituting the outer surface of the main body housing, and is projected onto the screen. It may be provided on the outer surface different from the surface provided with the discharge port for discharging the. According to the projector of Application Example 9, since the imaging sensor is located on the outer surface different from the surface where the discharge port is provided, the degree of freedom in the position where the imaging sensor is provided can be increased.

  The form of the present invention is not limited to the projector, and can be applied to other forms such as a projector control method and a program for causing a computer to realize a function of controlling the projector. Further, the present invention is not limited to the above-described embodiments, and it is needless to say that the present invention can be implemented in various forms without departing from the spirit of the present invention.

  In order to further clarify the configuration and operation of the present invention described above, a projector as a projection apparatus to which the present invention is applied will be described below.

A. Example:
A1. Projector configuration:
FIG. 1 is an explanatory diagram mainly showing the configuration of the projector 10. The projector 10 projects an image on the screen 80. The projector 10 includes a color separation / synthesis optical system 20, a projection lens unit 30, a central processing unit (hereinafter referred to as a CPU) 110, a video projection unit 112, a video adjustment unit 114, a memory 120, A user interface 130, a video input unit 140, a spatial light modulation control unit 150, a focus driving unit 164, and image sensors 182 and 184 are provided.

  The video input unit 140 of the projector 10 receives video data representing a video to be projected on the screen 80 from an external device (for example, a personal computer or a digital video camera).

  The color separation / synthesis optical system 20 of the projector 10 is a projection optical system that generates projection light that represents an image projected on the screen 80. The color separation / combination optical system 20 separates the light generated by the light source 21 into red light, green light, and blue light, modulates each light, and then combines these lights into one light again to produce projection light. Is generated. In addition to the light source 21, the color separation / synthesis optical system 20 includes integrator lenses 22a and 22b, a polarization conversion element 23, dichroic mirrors 25a and 25b, spatial light modulators 28r, 28g, and 28b, and a dichroic prism 29. .

  The spatial light modulation controller 150 of the projector 10 controls the spatial light modulators 28r, 28g, and 28b in the color separation / synthesis optical system 20 based on the video data received by the video input unit 140. In this embodiment, the spatial light modulators 28r, 28g, and 28b are liquid crystal panels, and the spatial light modulation control unit 150 is a liquid crystal panel driving device.

  The projection lens unit 30 of the projector 10 projects the projection light generated by the color separation / synthesis optical system 20 onto the screen 80. The projection lens unit 30 includes a front lens 31, a zoom lens 32, a master lens 33, a focus lens 34, and a parallel glass 35, and these lenses are arranged in this order. In this embodiment, the zoom lens 32 and the focus lens 34 move back and forth along the optical axis of the projection lens unit 30.

  The zoom driving unit 162 of the projector 10 drives the zoom lens 32 in the projection lens unit 30. The focus driving unit 164 of the projector 10 drives the focus lens 34 in the projection lens unit 30.

  The user interface 130 of the projector 10 receives an instruction input from the user of the projector 10. In the present embodiment, the user interface 130 includes an infrared interface that receives an infrared input from a remote controller in addition to a plurality of buttons that receive a press input from the user.

  The image sensors 182 and 184 of the projector 10 are image sensors that image the screen 80. In the present embodiment, the image sensors 182 and 184 are CCD image sensors (Charge Coupled Device Image Sensors) which are one of solid-state image sensors, but may be CMOS image sensors (Complementary Metal Oxide Semiconductors).

  The CPU 110 of the projector 10 controls each part of the projector 10. The memory 120 of the projector 10 stores data and programs handled by the CPU 110. The video projection unit 112 of the projector 10 executes video projection processing for projecting a video based on the video data input from the video input unit 140 onto the screen 80. The video adjustment unit 114 of the projector 10 executes video adjustment processing for adjusting the video projected on the screen 80 based on the captured images captured by the imaging sensors 182 and 184. Details of the video adjustment processing will be described later. In this embodiment, the functions of the video projection unit 112 and the video adjustment unit 114 are realized by the CPU 110 operating based on software. However, as another embodiment, the electronic circuit of the projector 10 is physically You may implement | achieve by operating based on a circuit structure.

  FIG. 2 is an explanatory diagram mainly showing a configuration of the projector 10 as viewed from the side. FIG. 3 is an explanatory diagram mainly showing the configuration of the projector 10 as seen from the direction of the arrow AA in FIG. The projector 10 includes a main body housing 40 that houses the color separation / synthesis optical system 20 and the projection lens unit 30. The main body housing 40 is provided with an emission port 49 through which projection light from the projection lens unit 30 is emitted to the screen 80. In this embodiment, the main body housing 40 accommodates the entire projection lens unit 30, but in other embodiments, the projection lens unit 30 may be accommodated in a state where a part of the projection lens unit 30 protrudes from the discharge port 49.

  In the present embodiment, the main body housing 40 is a hexahedron, and an outer surface constituting the hexahedron includes an upper surface 41, a bottom surface 42, a front surface 43, a back surface 44, a left side surface 45, and a right side surface 46. included. The upper surface 41 of the main body housing 40 is an upper end portion located above the main body housing 40, and the bottom surface 42 of the main body housing 40 is a bottom end portion that is a surface facing the upper surface 41. The front surface 43 of the main body housing 40 is a front end portion facing the screen 80 in the main body housing 40, and the back surface 44 of the main body housing 40 is a surface facing the front surface 43, and is disposed on the screen 80 in the main body housing 40. It is also the rear end that turns back. The left side surface 45 of the main body housing 40 is a side end portion located on the left side toward the screen 80, and the right side surface 46 of the main body housing 40 is a side end portion located on the right side toward the screen 80.

  2 and 3, the distance LS from the imaging sensors 182 and 184 to the screen 80 is longer than the distance LP from the rear end of the projection lens unit 30 to the screen 80, and the imaging sensors 182 and 184 are projected. The lens unit 30 is provided at a position farther from the screen 80 than the position where the lens unit 30 is provided. That is, the image sensors 182 and 184 are provided in the main body housing 40 at positions closer to the back surface 44 than the projection lens unit 30. A distance LB from the screen 80 to the back surface 44 of the main body housing 40, and a distance (LB-LS) from the back surface 44 to the imaging sensors 182 and 184 is a distance from the back surface 44 to the projection lens unit 30 (LB-LP). Shorter than.

  In this embodiment, as shown in FIG. 3, the image sensors 182 and 184 are provided at positions sandwiching the optical axis AP of the projection light RP from the emission port 49 toward the screen 80. In the present embodiment, the imaging sensors 182 and 184 are provided on the upper surface 41 of the main body housing 40 provided with the discharge port 49, and are in contact with the rear surface 44 farther from the screen 80 among the edge portions on the upper surface 41. Located along the section.

  Each of the optical axes AL and AR of the imaging sensors 182 and 184 tends to the optical axis AP of the projection light RP when viewed from the direction of the arrow AA. That is, each of the optical axes AL and AR of the image sensors 182 and 184 intersects the optical axis AP of the projection light RP when viewed from the direction of the arrow AA. Each of the optical axes AL and AR of the image sensors 182 and 184 intersects the optical axis AP of the projection light RP before the screen 80. The optical axis AL of the imaging sensor 182 intersects with the optical axis AP of the projection light RP at an angle θL, and the optical axis AR of the imaging sensor 184 intersects with the optical axis AP of the projection light RP at an angle θR. In this embodiment, the angle θL of the image sensor 182 is the same as the angle θR of the image sensor 184. However, in other embodiments, the angle θL of the image sensor 182 is different from the angle θR of the image sensor 184. There may be. In the present embodiment, the imaging regions RL and RR that the imaging sensors 182 and 184 can capture the screen 80 overlap at the center of the screen 80, and the imaging region RS that combines the imaging regions RL and RR is an individual imaging. The region is wider than the regions RL and RR.

A2. Projector operation:
FIG. 4 is a flowchart showing the trapezoid correction process (step S10) executed by the video adjustment unit 114 of the projector 10. The trapezoidal correction process (step S10) is a process of setting the trapezoidal distortion correction amount to be applied to the video so that the video distortion caused by the inclination of the screen 80 with respect to the projector 10 is reduced. In the present embodiment, the video adjustment unit 114 executes the keystone correction process (step S10) after the projector 10 is turned on and the light source 21 is turned on or based on an instruction input from the user via the user interface 130. To do. In this embodiment, the keystone correction process (step S10) is realized by the CPU 110 of the projector 10 operating based on software. As another embodiment, an electronic circuit included in the projector 10 is a physical circuit thereof. It may be realized by operating based on the configuration.

  When the image adjustment unit 114 of the projector 10 starts the trapezoidal correction process (step S <b> 10) of FIG. 4, the distance detection pattern stored in advance in the memory 120 is transferred to the spatial light modulation control unit 150 to detect the distance. The pattern for use is projected on the screen 80 (step S120). In the present embodiment, the distance detection pattern is a pattern including a grid and a grid point.

  While the distance detection pattern is projected (step S120), the video adjustment unit 114 measures distances to a plurality of points on the screen 80 based on the captured images captured by the imaging sensors 182 and 184 (step S120). Step S130). In this embodiment, the distances to a plurality of points on the screen 80 are measured by triangulation.

  After the distances to a plurality of points on the screen 80 are measured (step S130), the video adjustment unit 114 calculates the inclination of the screen 80 with respect to the projector 10 based on the measured distances to the points (step S140). ). Thereafter, the video adjustment unit 114 calculates a trapezoidal distortion correction amount according to the inclination of the screen 80 (step S150), and sets the trapezoidal distortion correction amount as a correction value to be applied to the video projected on the screen 80 in advance. (Step S160).

  FIG. 5 is a flowchart showing the focus adjustment process (step S20) executed by the video adjustment unit 114 of the projector 10. The focus adjustment process (step S20) is a process of adjusting the focus of the projection light according to the distance from the projector 10 to the screen 80. In the present embodiment, the image adjustment unit 114 performs the focus adjustment process (step S20) after the projector 10 is turned on and the light source 21 is turned on or based on an instruction input from the user via the user interface 130. To do. In this embodiment, the focus adjustment process (step S20) is realized by the CPU 110 of the projector 10 operating based on software. As another embodiment, an electronic circuit included in the projector 10 is a physical circuit thereof. It may be realized by operating based on the configuration.

  When the image adjustment unit 114 of the projector 10 starts the focus adjustment process (step S20) in FIG. 5, the distance detection pattern stored in advance in the memory 120 is transferred to the spatial light modulation control unit 150, thereby detecting the distance. The pattern for use is projected on the screen 80 (step S220). In the present embodiment, the distance detection pattern is a pattern including a grid and a grid point.

  While the distance detection pattern is projected (step S220), the video adjustment unit 114 measures the distance to the center of the screen 80 based on the captured images captured by the imaging sensors 182 and 184 (step S230). ). In this embodiment, the distance to the center of the screen 80 is measured by triangulation.

  After the distance to the center of the screen 80 is measured (step S230), the video adjustment unit 114 calculates the position of the focus lens 34 according to the distance to the center of the screen 80 (step S250). In the present embodiment, a table in which the position of the focus lens 34 corresponding to a plurality of distances based on calibration is set is stored in the memory 120, and the position of the focus lens 34 is determined by linear interpolation using the value of this table. Calculated.

  After the position of the focus lens 34 is calculated (step S250), the video adjustment unit 114 outputs a control signal to the focus driving unit 164, thereby moving the focus lens 34 to the calculated position (step S260).

  FIG. 6 is a flowchart showing enlargement / reduction adjustment processing (step S30) executed by the video adjustment unit 114 of the projector 10. The enlargement / reduction adjustment process (step S30) is a process of adjusting the size of the image projected on the screen 80 in accordance with the size of the screen 80. In the present embodiment, the video adjustment unit 114 executes the enlargement / reduction adjustment process (step S30) after the projector 10 is turned on and the light source 21 is turned on or based on an instruction input from the user via the user interface 130. To do. In this embodiment, the enlargement / reduction adjustment process (step S30) is realized by the CPU 110 of the projector 10 operating based on software. As another embodiment, an electronic circuit included in the projector 10 is a physical circuit thereof. It may be realized by operating based on the configuration.

  When the image adjustment unit 114 of the projector 10 starts the enlargement / reduction adjustment process (step S30) in FIG. 6, the image sensor 182 and 184 captures a landscape in the projection direction (step S320). Thereafter, the video adjustment unit 114 detects a vertical edge and a horizontal edge corresponding to the outer shape of the screen 80 from the captured images captured by the imaging sensors 182 and 184 (step S330). Thereafter, the video adjustment unit 114 recognizes the detected vertical edge and horizontal edge as a screen frame that is a frame of the screen 80 (step S340).

  After the screen frame is recognized (step S350), the video adjustment unit 114 calculates the position of the zoom lens 32 according to the size of the screen frame (step S350). Thereafter, the video adjustment unit 114 outputs a control signal to the zoom driving unit 162, thereby moving the zoom lens 32 to the calculated position (step S360).

A3. effect:
According to the projector 10 described above, each of the imaging regions RL and RR by the imaging sensors 182 and 184 can be expanded in a direction that tends to the optical axis AP of the projection light RP. As a result, it is possible to extend the installation range of the projector that can perform the keystone correction process (step S10), the focus adjustment process (step S20), and the enlargement / reduction adjustment process (step S30), which are video adjustment processes based on the captured image.

  Further, since each of the optical axes AL and AR of the imaging sensors 182 and 184 intersects the optical axis AP of the projection light RP before the screen 80, each of the imaging regions RL and RR by the imaging sensors 182 and 184 The projection light RP can be further expanded in the direction of the optical axis AP. In addition, since the imaging regions RL and RR of the imaging sensors 182 and 184 overlap at least partially, imaging accuracy can be improved in the overlapping region where the imaging regions RL and RR overlap.

  Further, since the image sensors 182 and 184 are located along the edge portion closer to the back surface 44 among the edge portions on the upper surface 41 of the main body housing 40, the image sensors 182 and 184 are provided at positions further away from the screen. be able to. Further, since the imaging sensors 182 and 184 are provided on the upper surface 41 provided with the discharge port 49, the imaging sensors 182 and 184 can be provided at positions where the imaging regions RL and RR can be easily aligned with the screen 80.

A4. First modification:
FIG. 7 is an explanatory diagram mainly showing a configuration of the projector 11 as viewed from the side according to the first modification. The projector 11 according to the first modified example reflects the projection light projected from the projection lens unit 30 onto the reflecting mirror 50 and projects it onto the screen 80, and the color separation / synthesis optical system 20 and the projection according to the installation of the reflecting mirror 50. The projector 10 is the same as the projector 10 of the embodiment described above except that the arrangement of the lens unit 30 is different. Also in the projector 11, each of the optical axes AL and AR of the imaging sensors 182 and 184 tends to the optical axis AP of the projection light RP when viewed from the upper surface 41 side of the main body housing 40.

  According to the projector 11 in the first modification described above, each of the imaging regions RL and RR by the imaging sensors 182 and 184 tends to the optical axis AP of the projection light RP, as in the projector 10 of the above-described embodiment. Can be expanded in the direction. As a result, it is possible to extend the installation range of the projector that can perform the keystone correction process (step S10), the focus adjustment process (step S20), and the enlargement / reduction adjustment process (step S30), which are video adjustment processes based on the captured image.

A5. Second modification:
FIG. 8 is an explanatory diagram showing an external configuration of the projector 12 in the second modification. In the projector 12 of the second modification, a discharge port 49 that discharges projection light from the projection lens unit 30 to the screen 80 is provided in the front surface 43 of the main body housing 40, and the discharge port 49 to the front surface 43 is provided. Except that the arrangement of the color separation / synthesis optical system 20 and the projection lens unit 30 differs with the installation, it is the same as the projector 10 of the above-described embodiment. Also in the projector 12, each of the optical axes AL and AR of the imaging sensors 182 and 184 tends to the optical axis AP of the projection light RP when viewed from the upper surface 41 side of the main body housing 40. The imaging sensors 182 and 184 are provided on the upper surface 41 different from the front surface 43 of the main body housing 40 provided with the discharge port 49.

  According to the projector 12 in the second modification described above, each of the imaging regions RL and RR by the imaging sensors 182 and 184 tends to be the optical axis AP of the projection light RP, as in the projector 10 of the above-described embodiment. Can be expanded in the direction. As a result, it is possible to extend the installation range of the projector that can perform the keystone correction process (step S10), the focus adjustment process (step S20), and the enlargement / reduction adjustment process (step S30), which are video adjustment processes based on the captured image. Further, since the imaging sensors 182 and 184 are provided on the upper surface 41 different from the front surface 43 of the main body housing 40 provided with the discharge port 49, the degree of freedom of the positions where the imaging sensors 182 and 184 are provided can be increased. it can.

A6. Third modification:
FIG. 9 is an explanatory diagram showing the configuration of the projector 13 in the third modification. The projector 13 of the third modified example includes the angle changing unit 192 that changes the angle θL at which the optical axis AL of the imaging sensor 182 tends to the optical axis AP of the projection light RP, except that the projector 10 of the above-described embodiment. It is the same. In the projector 13, the angle changing unit 192 is a motor that rotates the imaging sensor 182 based on an instruction signal from the CPU 110, and sets an angle θL at which the optical axis AL of the imaging sensor 182 tends to the optical axis AP of the projection light RP. change. In the third modification, the angle θL of the image sensor 182 can be changed and the angle θR of the image sensor 184 is fixed. In other embodiments, the image sensor 182 is similar to the angle θL of the image sensor 182. The angle θR of 184 may also be changeable. In the third modification, the fixed imaging sensor 184 captures a part of the projection light RP, but in another embodiment, all of the projection light RP is obtained using a lens having a wide viewing angle such as a fisheye lens. This area may be photographed.

  According to the projector 12 in the second modification described above, each of the imaging regions RL and RR by the imaging sensors 182 and 184 tends to be the optical axis AP of the projection light RP, as in the projector 10 of the above-described embodiment. Can be expanded in the direction. As a result, it is possible to extend the installation range of the projector that can perform the keystone correction process (step S10), the focus adjustment process (step S20), and the enlargement / reduction adjustment process (step S30), which are video adjustment processes based on the captured image. In addition, the imaging region RL by the imaging sensor 182 can be enlarged or reduced according to the content of the video adjustment process based on the captured image.

B. Other embodiments:
The embodiments of the present invention have been described above. However, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the spirit of the present invention. is there. For example, in this embodiment, the imaging regions RL and RR of the imaging sensors 182 and 184 are at least partially overlapped. However, in other embodiments, the imaging sensors 182 and 182 can be increased by further increasing the angles θL and θR. The imaging regions RL and RR of 184 may be separated from each other. As a result, the imaging region RS can be further expanded.

  In the present embodiment, the optical axes AL and AR of the image sensors 182 and 184 tend to be the optical axis AP of the projection light RP. However, in other embodiments, the optical axes AL of the image sensors 182 and 184 are used. , AR may be inclined toward the optical axis AP of the projection light RP. In this embodiment, each of the optical axes AL and AR of the image sensors 182 and 184 intersects with the optical axis AP of the projection light RP in front of the screen 80. However, in another embodiment, May intersect the optical axis AP of the projection light RP.

  Further, the number of imaging sensors provided at a position farther from the screen 80 than the projection lens unit 30 is not limited to two, and may be one or three or more. Further, the outer surface on which the imaging sensors 182 and 184 and the discharge port 49 are arranged in the main body housing 40 is not limited to the upper surface 41, and the installation form of the projector, the external shape of the projector, the relative position between the projector and the screen, etc. Depending on the embodiment, it may be arranged on the bottom surface 42, the front surface 43, the back surface 44, the left side surface 45, and the right side surface 46.

  Further, the number of spatial light modulators is not limited to three, but may be three or less, or may be three or more. In the present embodiment, a transmissive liquid crystal panel that modulates transmitted light is illustrated in FIG. 1 as a liquid crystal panel that is one of the spatial light modulators. However, in another embodiment, a reflective type that modulates reflected light is illustrated. A liquid crystal panel may be used, or a micromirror type light modulation device such as a digital micromirror device (DMD (registered trademark)) may be used.

4 is an explanatory diagram mainly showing a configuration of a projector. FIG. It is explanatory drawing which mainly shows the structure which looked at the projector 10 from the side surface. It is explanatory drawing which mainly shows the structure of the projector 10 seen from the arrow AA direction in FIG. It is a flowchart which shows the trapezoid correction process (step S10) which the image | video adjustment part 114 of the projector 10 performs. It is a flowchart which shows the focus adjustment process (step S20) which the image | video adjustment part 114 of the projector 10 performs. It is a flowchart which shows the expansion / contraction adjustment process (step S30) which the image | video adjustment part 114 of the projector 10 performs. It is explanatory drawing which mainly shows the structure which looked at the projector 11 in the 1st modification from the side. It is explanatory drawing which shows the external appearance structure of the projector 12 in a 2nd modification. It is explanatory drawing which shows the structure of the projector 13 in a 3rd modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 11, 12 ... Projector 20 ... Color separation synthetic | combination optical system 21 ... Light source 22a, 22b ... Integrator lens 23 ... Polarization conversion element 25a, 25b ... Dichroic mirror 28r, 28g, 28b ... Spatial light modulator 29 ... Dichroic prism 30 ... Projection lens unit 31 ... Front lens 32 ... Zoom lens 33 ... Master lens 34 ... Focus lens 35 ... Parallel glass 40 ... Main body casing 41 ... Top 42 ... Bottom 43 ... Front 44 ... Back 45 ... Left side 46 ... Right side 49 ... Emission port 50 ... Reflector 80 ... Screen 110 ... CPU
DESCRIPTION OF SYMBOLS 112 ... Video projection part 114 ... Video adjustment part 120 ... Memory 130 ... User interface 140 ... Video input part 150 ... Spatial light modulation control part 162 ... Zoom drive part 164 ... Focus drive part 182, 184 ... Imaging sensor

Claims (9)

A projector that projects an image on a screen,
A projection optical system for generating projection light representing the image;
A projection lens unit in which a plurality of lenses that project the projection light generated by the projection optical system onto the screen are arranged;
First and second imaging sensors that are respectively provided at positions sandwiching a projection optical axis that is an optical axis of projection light directed from the projector toward the screen;
A projection adjustment unit that adjusts an image projected on the screen based on captured images captured by the first and second imaging sensors;
The projector in which at least one optical axis of the first and second imaging sensors tends to the projection optical axis.   The projector according to claim 1, wherein an optical axis that tends to the projection optical axis among the optical axes in the first and second imaging sensors intersects the projection optical axis before the screen.   3. The projector according to claim 1, wherein each of the imaging regions in which the first and second imaging sensors can capture the screen overlap at least partially.   3. The projector according to claim 1, wherein the imaging areas in which the first and second imaging sensors can photograph the screen are separated from each other.   5. The projector according to claim 1, further comprising an angle changing unit that changes an angle at which at least one of the first and second imaging sensors tends to the projection optical axis. A projector according to any one of claims 1 to 5,
Furthermore, a main body housing for accommodating at least a part of the projection optical system and the projection lens unit, the main body housing having a rear end portion facing back to the screen,
The first and second imaging sensors are projectors provided in the main body housing at a position closer to the rear end portion than the projection lens unit.   The imaging sensor is provided on one of a plurality of surfaces constituting an outer surface of the main body housing, and is located along an edge portion closer to the rear end portion among edge portions on the surface. Projector.   The imaging sensor is provided on one of a plurality of surfaces constituting an outer surface of the main body housing and provided with a discharge port for emitting projection light to the screen. Item 8. The projector according to Item 7.   The imaging sensor is one of a plurality of surfaces constituting the outer surface of the main body casing, and is provided on an outer surface different from a surface provided with an emission port for emitting projection light to the screen. The projector according to claim 6 or 7.

Images