JP2007166280A - Projector, screen for projector and projector image display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector and a screen for the projector in which installation position can be adjusted such that the screen surface becomes perpendicular to the optical axis in the center of the screen by an extremely simple technique. <P>SOLUTION: The screen 70 attaching reflectors 72 and 73 is installed in the center of the upper or lower end frame of the screen or in the center of the upper and lower end frames of the screen. A test pattern including a vertical line of high brightness is projected to the center of an image from a projector 10, the vertical line 77 of the test pattern is applied to the reflector 72 and reflected thereon by regulating optical zoom or optical shift, and the light 75 reflected from the reflector onto the floor is aligned with the projection line in the vertical direction of the projection optical axis 27. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector, a projector screen, and a projector image display system, and more particularly to a projector and a projector that can easily adjust the installation position of the projector so that the optical axis of a projection lens is perpendicular to the horizontal direction of the screen. The present invention relates to a screen and a projector image display system.

  When installing the projector, it is necessary to adjust the relative positional relationship between the screen and the projector to be appropriate. In general, a projector obtains a correct image when projecting so that the extension direction of the center line of the projection lens (hereinafter referred to as the projection optical axis) is perpendicular to the horizontal and vertical sections of the projection surface of the screen. be able to. At this time, if the projection is performed in a direction deviating from the vertical direction, an asymmetrical projection distortion occurs in the image. Conventionally, in order to install and adjust the optical axis of the projector to a position perpendicular to the horizontal direction of the screen, the left and right ends of the central part in the vertical direction of the screen and the center of the projection lens are used using a string or a saw thread. The position of the projector is adjusted so that the distance between the projector and the projector is equal, or the distance to the left and right ends is measured using a measure to make them the same.

  FIG. 6 is a schematic perspective view showing a method for adjusting the relative positional relationship between the screen and the projector in the conventional example to be appropriate. As shown in FIG. 6, an image having linear test patterns 177 and 178 extending in the vertical direction and the horizontal direction around the projection optical axis 127 is projected from the projector 110 onto the screen 170, and the central horizontal line 178 of the test pattern is displayed. And the distance between the left and right ends of the screen 170 and the center of the projection lens are measured, and the projector 110 is moved so that the left and right distances are the same. It was adjusted to coincide with the horizontal center. The adjustment in the vertical direction is performed by adjusting the tilt foot of the projector 110 after adjusting in the horizontal direction, or by tilting the projector 110 with respect to the installation surface of the cradle.

In Patent Document 1, the vertical and horizontal tilt angles are calculated from the vertical tilt sensor and the horizontal light intensity distribution of incident light from the pinhole, and image control of a personal computer connected to the projector is performed. A projector is disclosed that generates corrected video information by correcting an image by a distortion correction unit of a unit, and projects the image so as not to generate a trapezoidal distortion caused by tilt angles in the vertical direction and the horizontal direction.
JP-A-2005-150818

  The conventional distance measuring method using a measure and the installation adjusting method using a weft thread do not require a special device for adjustment, but there is a problem that it takes time and an error occurs. In the case of a flat screen, there is a high possibility that the projection distortion will be in an allowable range depending on the usage situation even if it is slightly deviated from the vertical direction, but in the case of a curved screen such as a cylindrical surface, it is necessary to correct the geometric distortion. The need to project perpendicular to the screen is higher. The reason for this is that when projecting in a state of being deviated from the vertical direction with respect to the curved screen, the distortion of the projected image that is generated is a combination of geometric distortion caused by the shape of the curved screen and asymmetrical projection distortion. This is because it becomes complicated and adjustment becomes extremely difficult. Therefore, in order to make the distortion of the projected image within an allowable limit, it is necessary to accurately match the distance between the left and right edges of the screen and the center of the projection lens, and a great deal of labor is required for installation adjustment.

  Further, in the adjustment method as described in Patent Document 1, distortion correction is automatically performed without correcting the position and inclination of the projector itself, but a device for measuring and adjusting the inclination is required. The projector itself is large and expensive.

  An object of the present invention is to provide a projector and a projector screen capable of adjusting the installation position so that the optical axis is perpendicular to the screen surface at the horizontal central portion of the screen by a very simple method. It is in.

The projector of the present invention
A projector capable of projecting a test pattern on a projection surface, having a light source unit, a light beam modulating unit, and a projection lens, projecting an image generated by the light beam modulating unit, and a video signal input A video signal input unit, a test pattern generation unit that generates a high-luminance line that includes the projection optical axis of the projection device and is parallel to the vertical direction of the image of the light flux modulation unit, an input from the video signal input unit, and a test An image control unit that controls an image of the light beam modulation unit by switching an input from the pattern generation unit.

  The horizontal inclination display device has a high luminance by analyzing a digital camera having an imaging lens capable of securing an angle of view near 180 ° and an imaging screen of the imaging device of the digital camera. A digital camera having an imaging lens that can obtain a coordinate of a point and display an image analysis light receiving point display unit that displays the coordinate as a horizontal position from the coordinate of the projection optical axis, and can secure an angle of view near 180 ° And a projection direction adjusting device that moves the projector body based on the output of the digital camera.

  The projection lens may constitute a zoom optical system capable of adjusting the length of the high-intensity line of the projected test pattern at a predetermined distance, and the optical system capable of adjusting the position of the high-intensity line of the projected test pattern May be configured.

The projector screen of the present invention is
A reflection plate having a reflection surface parallel to the projection surface in the vicinity of the attachment portion is provided in at least one of the vicinity of the center of the lower end edge of the projection surface and the vicinity of the center of the upper edge.

The projector image display system of the present invention is
The projector is composed of the projector described above and the projector screen described above.

  The projector of the present invention has a test pattern generation unit that generates a high-luminance line that includes the projection optical axis of the projection device and is parallel to the vertical direction of the projection image as a test pattern. A test pattern is projected on the screen. On the other hand, the screen of the present invention is provided with a reflecting plate having a reflecting surface parallel to the projection surface at the lower end or upper end of the screen or near the center of both.

  The projector is rotated so that the test pattern is incident on the reflecting plate, and the reflected light from the reflecting surface is imaged on the floor surface or the ceiling surface. By moving and rotating the projector so that the vertical direction of the image formation point coincides with the projection optical axis of the projector, the projection optical axis of the projector is perpendicular to the screen surface at the horizontal center of the screen. Adjusted to

  Also, the digital camera having an imaging lens capable of securing an angle of view near 180 ° and the imaging screen of the imaging device of the digital camera are analyzed to obtain the coordinates of the high luminance point, and the horizontal direction from the coordinates of the projection optical axis is obtained. If a horizontal direction inclination display device including an image analysis light receiving point display unit that displays as a position is provided, the degree of inclination of the projector can be known from the displayed position information. By rotating the projector so that the test pattern is incident on the reflector and moving the displayed position so that it matches the coordinates of the projection optical axis, the projector's optical axis is at the horizontal center of the screen. It is adjusted to be perpendicular to the surface.

  Furthermore, by providing a projection direction adjusting device capable of moving and rotating the projector main body, and moving and rotating the projector main body via the projection direction adjusting device, the optical axis of the projector is more easily leveled with the screen. It is adjusted to be perpendicular to the screen surface at the center of the direction.

  The present invention can project a high-luminance line including the projection optical axis of the projection apparatus and parallel to the vertical direction of the projected image as a test pattern from the projector onto the screen at the lower end or near the center of the upper end. A reflecting plate having a reflecting surface parallel to the surface is provided. Rotate the projector so that the test pattern is incident on the reflector, and the vertical direction of the image point of the reflected light from the reflective surface imaged on the floor or ceiling surface matches the projection optical axis of the projector. By moving and rotating the projector, there is an effect that the installation position of the projector can be easily adjusted so that the optical axis of the projector is vertical to the horizontal line on the screen surface at the center in the horizontal direction of the screen.

  Further, the coordinates of the image point on the floor surface or ceiling of the reflected light from the reflector of the high luminance line are acquired by a digital camera capable of imaging at a wide angle, and the distance from the reference line is displayed. By rotating the projector so that the test pattern is incident on the reflecting plate and moving the displayed position so as to coincide with the reference line, the optical axis of the projector is in contact with the screen surface at the horizontal center of the screen. There is an effect that the installation position of the projector can be easily adjusted to be vertical.

  Furthermore, by providing a projection direction adjusting device capable of moving and rotating the projector main body, and moving and rotating the projector main body via the projection direction adjusting device, the optical axis of the projector can be more easily adjusted in the horizontal direction of the screen. There is an effect that the installation position of the projector can be adjusted so that it is perpendicular to the screen surface at the center.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram of the projector according to the first embodiment of the present invention. FIG. 2 is a schematic side view illustrating a state in which a test pattern is projected from the projector according to the first embodiment of the present invention onto the screen according to the present embodiment, and FIG. 3 is a diagram illustrating the first embodiment of the present invention. It is a typical top view which shows the state which projected the test pattern from the projector of form to the screen of embodiment of this invention.

  The projector 10 includes a projection device 20 having a projection lens 21, a light beam modulation unit 22, and a light source unit 23, an image control unit 24 that controls an image of the light beam modulation unit 22, a video signal input unit 25, and a test pattern generation unit. 26 and a CPU 50 for controlling the overall operation. The light beam modulation unit 22 of the projector 10 may be a liquid crystal projector or a DLP (digital light processing) projector.

  The test pattern generation unit 26 generates a high luminance line including the projection optical axis 27 of the projection device 20 and parallel to the vertical direction of the projection image as a test pattern, and the test pattern is projected via the image control unit 24 to the projection device. 20 is projected onto the screen 70 of the embodiment of the present invention.

  The image control unit 24 normally controls the light beam modulation unit 22 based on the video signal from the video signal input unit 25 and projects an image corresponding to the video signal onto the screen 70. When the input is switched to a signal from the test pattern generation unit 26, a high-luminance line generated by the test pattern generation unit 26 and including the projection optical axis 27 of the projection device 20 and parallel to the vertical direction of the projection image is used as a test pattern. Projection is performed on the screen 70 from the light beam modulator 22 via the projection lens 21.

  The screen on which the test pattern is projected is a reflecting plate 72 having a reflecting surface parallel to the projecting surface 71 on the projecting surface 71 near the center of the edge of the lower end and / or the upper end of one aspect of the present invention. 73 is a screen 70 provided with 73.

  Further, the projection lens 21 of the projector 10 is adjusted so that the projected image protrudes from the screen 70 by optical zoom, so that the light from the high-luminance line of the test pattern is reliably irradiated to the reflecting mirrors 72 and 73. Is possible. Further, when the projector 10 has an optical shift mechanism, the projected image protrudes to the upper and lower portions of the screen 70 by translating the projection lens up and down by optical shift instead of adjusting the optical zoom. You can also. In either case, after the projector 10 is installed and adjusted to the correct position and angle with respect to the screen 70, the optical zoom and the optical shift mechanism are adjusted again and projected to an appropriate position in the screen. The geometric distortion correction is adjusted accordingly.

  Next, a method for adjusting the position of the projector 10 according to the embodiment of the present invention so that the projection optical axis 27 of the projector 10 is perpendicular to the horizontal direction of the screen projection surface 71 at the center of the screen 70 will be described in detail. explain. As shown in a side view in FIG. 2 and a top view in FIG. 3, a test pattern including a central vertical line 77, which is a high luminance line, at the center of the image is projected from the projector 10 with respect to the projection surface 71 of the cylindrical screen 70. Irradiated. Here, reflectors 72 and 73 are installed near the center of the lower frame portion of the screen 70 and near the center of the upper frame portion. The screen is described as a cylindrical screen 70 for easy understanding, but is not limited to the cylindrical screen 70 and can be applied to a screen having a curved surface and a flat screen.

  Here, the projection light from the projection lens 21 of the projector 10 is adjusted by optical zoom and projected between the upper limit 28 of the projection range and the lower limit 29 of the projection range, and the projected image protrudes from the screen 70. Will be described. This makes it possible to reliably irradiate the reflecting mirrors 72 and 73 with light from the high-luminance line of the test pattern. However, since the projection conditions in this embodiment can be adjusted by reflected light from one reflecting mirror, adjustment is performed so that the high-brightness line of the test pattern projects only one reflecting mirror by optical shift. May be. Alternatively, the projector 10 may be tilted in the vertical direction on the pedestal 60 to irradiate the high-luminance line of the test pattern toward one reflecting mirror, and the tilt may be returned in the vertical direction after the adjustment is completed.

  Reflecting plates 72 and 73 having reflecting surfaces parallel to the projection surface 71 in the vicinity of the attachment portion are provided in the vicinity of the center of the lower end edge of the projection surface 71 and at the vicinity of the center of the upper end edge. The projector screen 70 is installed at a predetermined position. In this case, a normal screen is installed, and the reflection plates 72 and 73 are located at least near the center of the lower end edge of the projection surface and near the center of the upper end edge, and the reflection surface is parallel to the projection surface near the attachment portion. You may attach as follows. The reflecting plates 72 and 73 do not necessarily have to be highly reflective objects such as mirrors, and may be mirror-finished metal plates or tapes deposited with metal particles.

  Next, the test pattern generation unit 26 of the projector 10 generates a high-luminance line including the projection optical axis 27 of the projection device 20 and parallel to the vertical direction of the projection image as a test pattern, and projects via the image control unit 24. Projecting from the apparatus 20 onto the screen 70. If possible, adjust the zoom optical system so that the image projected from the projector 10 exceeds the projection surface of the screen 70, or adjust the position of the optical system so that the image illuminates at least one of the reflectors 72 and 73. Alternatively, the inclination angle of the projector 10 in the vertical direction is adjusted.

  Next, the projector 10 is rotated in the horizontal direction so that the vertical high-intensity line, which is the central vertical line 77 of the test pattern, projected onto the screen 70 directly irradiates at least one of the reflectors 72 and 73. Or move it. Thereby, the reflected light of the high-luminance line reflected by the reflecting plates 72 and 73 connects the reflection point to the floor surface or ceiling, and becomes reflected light 75 from the reflecting plate reflected on the floor, for example. When the projection optical axis 27 of the projector 10 deviates from the vertical direction with respect to the horizontal direction of the central projection surface 71 of the screen 70, the reflected light 75 from the reflector reflected on the floor is perpendicular to the projection optical axis 27. The position is out of the projected line of the floor. On the contrary, when the reflected light 75 from the reflector reflected on the floor coincides with the vertical projection line of the projection optical axis 27, the projection optical axis 27 of the projector 10 is in the horizontal direction of the central projection surface 71 of the screen 70. It is vertical. Whether or not the reflected light 75 from the reflector reflected on the floor coincides with the vertical projection line of the projection optical axis 27 is determined at the position where the vertical high-brightness line can be seen from above the projector 10. This can be easily determined by looking at the imaging point of the reflected light from the reflected reflector.

  Therefore, while the central vertical line 77 of the test pattern directly irradiates at least one of the reflecting plates 72 and 73, the reflected light 75 from the reflecting plate reflected on the floor coincides with the vertical projection line of the projection optical axis 27. Thus, when the projector 10 is rotated and moved, the projection optical axis 27 of the projector 10 becomes perpendicular to the horizontal direction of the central projection surface 71 of the screen 70, and the purpose of adjustment can be achieved.

  At this time, when the position of the screen 70 is high and therefore the position of the reflection plate 72 is also high, the reflected light may not be projected onto the floor. In such a case, the installation position of the projector can be adjusted using reflected light projected on the front surface of the cradle 60. Further, the position of the reflected light can be seen by holding a plate-like object over the lower part of the projection lens of the projector 10. This plate-like object is not used for confirming the projected image, but is used only for confirming the position of the reflected light, so it can be replaced with a palm or the like. In the above description, the reflected light image point on the floor has been described. However, when the reflected light image is formed on the ceiling, the ceiling image point can also be used.

  Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a schematic block diagram of a projector according to the second embodiment of the present invention. Since the projector 10 is the same as the first embodiment except that the horizontal tilt angle display device 30 is added, the same components and operations are denoted by the same reference numerals and description thereof is omitted.

  The horizontal inclination angle display device 30 includes a digital camera 31 having an imaging lens 32 and an imaging element 33 that can secure an angle of view near 180 °, and an image analysis light receiving point display unit 36. The image analysis light receiving point display unit 36 analyzes the pixels of the image captured by the image sensor 52, and displays the coordinates of the light receiving points on the floor surface of the reflected light of the high brightness line reflected from the reflecting plate 72 of the screen 70. The projection optical axis 27 is displayed on the screen at a distance from the coordinate reference line as coordinates perpendicular to the projection line with the vertical projection line on the floor as the reference line. The display may be a lighting position in the left and right lamp rows centered on the reference line, a bar graph, or a numerical value display. Just do it.

  Next, the operation of the second embodiment will be described. The test pattern generation unit 26 of the projector 10 generates a high-luminance line including the projection optical axis 27 of the projection device 20 and parallel to the vertical direction of the projection image as a test pattern, and from the projection device 20 via the image control unit 24. Projects onto the screen 70 of the present invention. If possible, adjust the zoom optical system so that the image projected from the projector 10 exceeds the projection surface of the screen 70, or adjust the position of the optical system so that the image illuminates at least one of the reflectors 72 and 73. Alternatively, the inclination angle of the projector 10 in the vertical direction is adjusted.

  Next, the projector 10 is rotated in the horizontal direction so that the vertical high-intensity line, which is the central vertical line 77 of the test pattern, projected onto the screen 70 directly irradiates at least one of the reflectors 72 and 73. Or move it. Thereby, the reflected light of the high-luminance line reflected by the reflecting plates 72 and 73 connects the imaging point to the floor surface or ceiling, and becomes reflected light 75 from the reflecting plate reflected on the floors of FIGS. When the high-luminance line does not directly irradiate the reflector, no light receiving point is generated on the floor surface, so that the digital camera 31 does not capture an image. When the coordinates of the light receiving point are not displayed on the image analysis light receiving point display unit 36, the projector 10 is rotated or moved until the coordinates of the light receiving point are displayed. This operation may be performed while visually recognizing the relationship between the reflector 72 on the screen 70 and the high luminance line.

  When the projector 10 is rotated and moved so that the light receiving point coincides with the reference line while maintaining the state in which the coordinates of the light receiving point are displayed on the image analysis light receiving point display unit 36, the projection optical axis 27 of the projector 10 is changed. The center of the projection surface 71 of the screen 70 is perpendicular to the horizontal direction, and the purpose of adjustment can be achieved.

  In the first embodiment, the coincidence between the projection line in the vertical direction of the projection optical axis 27 where the actual projection line is not displayed on the floor and the light receiving point is visually confirmed, but the second embodiment Then, since it can confirm with the display of the image analysis light receiving point display part 36, adjustment is easy and reliable.

  Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a schematic block diagram of a projector according to the third embodiment of the present invention. Since the projector 10 is the same as the second embodiment except that the projection direction adjusting device 40 is added, the same configuration and operation are denoted by the same reference numerals and description thereof is omitted.

  The projection direction adjusting device 40 is a device that holds the projector 10 main body with the cradle 60 and allows the projector 10 main body to rotate and slide laterally with respect to the cradle 60. Here, the projection direction adjusting device 40 is provided on the upper surface and is provided on the lower surface of the rotating unit 43 that holds the projector 10 main body so as to be rotatable and fixed, and the projection direction adjusting device 40 is placed on the pedestal 60 on the projection optical axis 27. It has front and rear slide rails 41 and 42 that enable sliding and fixing in the left-right direction. A wheel may be used instead of the slide rail.

  In the first and second embodiments, the projector 10 is rotated and moved on the table 60 for adjustment, but in the third embodiment, the projector 10 is connected via the projection direction adjusting device 40. The projection direction adjusting device 40 can be slid left and right on the table 60 via the slide rails 41 and 42, and the projector 10 main body is held by the projection direction adjusting device 40 via the rotating unit 43. The projector 10 can be rotated and moved in the lateral direction with a small force, and the rotating unit 43 and the slide rails 41 and 42 can be fixed. This state can be stably maintained.

  While maintaining the state in which the central vertical line 77 of the test pattern directly irradiates at least one of the reflectors 72 and 73, the reflected light 75 from the reflector reflected on the floor is projected in the vertical direction of the projection optical axis 27. When the projector 10 is rotated and moved so as to coincide with the line, the projection optical axis 27 of the projector 10 becomes perpendicular to the horizontal section of the central portion of the screen 70, and the purpose of adjustment can be achieved.

  Here, the rotation and the lateral movement are performed manually. However, the coordinate information of the light receiving point is received from the image analysis light receiving point display unit 30, and the rotating unit 43 and the slide rails 41 and 42 are used by using a driving mechanism. It is also possible to automatically perform the operation and control.

  The fourth embodiment of the present invention is a projector image display system, and as shown in FIGS. 1 to 5, the projector according to the first to third embodiments of the present invention and the embodiment of the present invention. The projector image display system is configured in combination with the screen.

1 is a schematic block configuration diagram of a projector according to a first embodiment of the invention. It is a typical side view which shows the state which projected the test pattern from the projector of the 1st Embodiment of this invention on the screen of the embodiment of this invention. FIG. 3 is a schematic top view showing a state in which a test pattern is projected from the projector according to the first embodiment of the present invention onto the screen according to the embodiment of the present invention. It is a typical block block diagram of the projector of the 2nd Embodiment of this invention. It is a typical block block diagram of the projector of the 3rd Embodiment of this invention. It is a typical perspective view which shows the method of adjusting so that the relative positional relationship of the screen of a prior art example and a projector may become appropriate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,110 Projector 20 Projection apparatus 21 Projection lens 22 Light beam modulation part 23 Light source part 24 Image control part 25 Video signal input part 26 Test pattern generation part 27, 127 Projection optical axis 28 Upper limit of projection range 29 Lower limit of projection range 30 Horizontal direction Tilt angle display device 31 Digital camera 32 Imaging lens 33 Image sensor 36 Image analysis light receiving point display unit 40 Projection direction adjustment device 41, 42 Slide rail 43 Rotating unit 50 CPU
60 Stand 70, 170 Screen 71 Projection surface 72, 73 Reflector 74 Reflected light from reflector 75 Reflected light from reflector reflected on floor 76 Reflected light from test pattern reflected on floor 77, 177 Test pattern Center vertical line 178 Test pattern center horizontal line 181 Distance to the left edge of the screen 182 Distance to the right edge of the screen

Claims (7)

A projector capable of projecting a test pattern on a projection surface,
A projection device that has a light source unit, a light beam modulation unit, and a projection lens, and that projects an image generated by the light beam modulation unit;
A video signal input unit to which a video signal is input;
A test pattern generation unit that generates a high-luminance line that includes the projection optical axis of the projection device and is parallel to the vertical direction of the image of the light flux modulation unit,
A projector comprising: an input from the video signal input unit; and an image control unit that switches an input from the test pattern generation unit to control an image of the light beam modulation unit. It has a horizontal direction inclination display device, the horizontal direction inclination display device,
A digital camera having an imaging lens capable of securing an angle of view near 180 °;
2. An image analysis light receiving point display unit that analyzes an image pickup screen of an image pickup element of the digital camera to acquire coordinates of a high luminance point and displays it as a horizontal position from the coordinates of the projection optical axis. Projector. A digital camera having an imaging lens capable of securing an angle of view near 180 °;
The projector according to claim 1, further comprising a projection direction adjusting device that moves the projector main body based on an output of the digital camera.   The projector according to any one of claims 1 to 3, wherein the projection lens constitutes a zoom optical system capable of adjusting a length of a high-intensity line of the test pattern projected at a predetermined distance.   The projector according to any one of claims 1 to 3, wherein the projection lens constitutes an optical system capable of adjusting a position of a high-luminance line of the projected test pattern.   A projector screen comprising a reflecting plate having a reflecting surface parallel to the projection surface in the vicinity of the attachment portion at least near the center of the lower end edge of the projection surface and near the center of the upper edge.   A projector image display system comprising the projector according to any one of claims 1 to 5 and the projector screen according to claim 6.

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