JP2009175322A - projector - Google Patents

Abstract

A projector capable of automatically aligning a projected image on a screen without distorting the projected image.
A projector 1 is configured to be able to fit a projected video G onto a screen SC while maintaining a projection angle θ1, the projector main body 2 projecting the projected video G onto the screen SC, and the screen SC. The screen information acquisition means for acquiring the vertical displacement amount h of the projection image G, the projector main body 2 is mounted, the lifting mechanism 4 for moving the mounted projector main body 2 up and down, and the vertical shift based on the shift amount. Control means for controlling the elevating mechanism 4 so that the position of the screen in the direction and the position of the projected image G coincide with each other.
[Selection] Figure 2

Description

  The present invention relates to a projector configured to be able to fit a projected image on a screen while maintaining a projection angle.

2. Description of the Related Art Conventionally, an angle adjustment base device that can adjust the projection angle and vertical position of a projector is known as a projector installation base (see Patent Document 1). This angle adjustment base device includes a base on which the projector is placed, an angle setting mechanism that allows the base to swing in a swinging manner and is fixed at an arbitrary inclination angle, and a support that adjusts the base to a required height. And have. The user adjusts the projector to a predetermined height by the support unit, and then adjusts the projected image of the projector to the screen by the angle setting mechanism.
JP 2005-121918 A

  In such a conventional installation stand, it is necessary to adjust the height and projection angle of the projector by operating the operation knob, so that there is a problem that the operation becomes complicated. Further, when the projection angle is adjusted, there is a problem that the projected image is distorted into a trapezoid. Here, a method for correcting a projection image distorted by digital processing or the like is known, but in such a case, the pixel position between each color shifts and the image quality deteriorates. There is a limit.

  An object of the present invention is to provide a projector that can automatically fit a projected image on a screen without distorting the projected image.

  The projector of the present invention is a projector configured to be able to fit a projected image on a screen while maintaining a projection angle, and a projector body that projects the projected image on the screen, and a vertical direction of the projected image on the screen. Screen information acquisition means for acquiring a deviation amount, a projector main body is mounted and a lifting mechanism for raising and lowering the placed projector main body, and based on the deviation amount, the position of the screen and the position of the projected image in the vertical direction And a control means for controlling the elevating mechanism so as to coincide with each other.

  According to this configuration, the amount of vertical displacement of the projected image with respect to the screen is acquired by the screen information acquisition unit. And based on the acquired deviation | shift amount, a projector main body is raised / lowered by a raising / lowering mechanism so that the position of a screen and a projection image | video may match, and a projection image | video is adjusted and projected to a screen. Therefore, by raising and lowering the projector main body, it is possible to automatically project a projection image without distortion on the screen.

  In this case, the screen information acquisition means includes a distance measurement means for measuring the distance between the projector body and the screen, an imaging means for imaging the screen and the projected video, and the screen and the projected video based on the imaging result of the imaging means. It is preferable to include a vertical shift amount acquisition unit that acquires the vertical shift amount, and a shift amount calculation unit that calculates a shift amount of the projected video with respect to the screen from the distance and the vertical shift amount.

  According to this configuration, the distance measuring unit measures the distance between the projector main body and the screen. Then, the screen and the projected video are imaged by the imaging unit, and the vertical shift amount between the screen and the projected video is measured by the vertical shift amount acquisition unit. Furthermore, the amount of deviation in the vertical direction between the screen and the projected image can be easily calculated from the distance between the projector main body and the screen and the amount of deviation in the vertical direction between the screen and the projected image. The distance measuring means is preferably a laser type distance sensor that measures the distance from the round trip time of the emitted laser light. The imaging means is preferably a CCD camera or a CMOS camera.

  In this case, the screen information acquisition means includes a distance measurement means for measuring a distance between the projector main body and the screen, an inclination angle detection means for detecting an alignment inclination angle in a state where the projection image is aligned with the screen, and a distance. It is preferable to have deviation amount calculation means for calculating the deviation amount of the projected image with respect to the screen from the fitting inclination angle.

  According to this configuration, the distance measurement unit measures the distance between the projector main body and the screen, and the tilt angle detection unit adjusts the projection image to the screen for the state where the projector main body is placed on the lifting mechanism. The alignment inclination angle in the state is detected. Then, the amount of deviation in the vertical direction of the screen and the projected image can be easily calculated from the distance and the fitting inclination angle by the amount of deviation calculation means. The inclination angle detection means is preferably an acceleration sensor or an inclination measurement sensor that captures an angle change by a corresponding voltage output.

  In this case, the elevating mechanism is interposed between the upper base on which the projector main body is placed, the lower base arranged in parallel with the upper base, and the upper base and the lower base. An X-link mechanism that translates in the vertical direction, a lead screw that is screwed to the X-link mechanism and moves the X-link mechanism to open and close, and a motor that is connected to the lead screw and rotates the lead screw forward and backward. It is preferable.

  According to this configuration, the projector main body can be easily raised and lowered by the X link mechanism using the motor as a drive source.

  In this case, the elevating mechanism includes a movable column on which the projector main body is placed, a fixed column that is slidably engaged in the up and down direction with the movable column being in a rotation-stopped state, and is screwed to the movable column to raise and lower the movable column. It is preferable to have a lead screw and a motor connected to the lead screw and rotating the lead screw forward and backward.

  According to this configuration, the projector body can be easily moved up and down by the movable support column and the fixed support column using the motor as a drive source.

(First embodiment)
Hereinafter, a projector according to a first embodiment of the invention will be described with reference to the accompanying drawings. In this projector, a projector main body that projects a projected image is moved up and down, and the projected image is automatically aligned with a screen.

  As shown in FIGS. 1 and 2, the projector 1 includes a projector main body 2 that projects a projection video G on a screen SC, and a screen information acquisition unit that acquires a vertical shift amount h of the projection video G with respect to the screen SC. (Screen information acquisition means) 3, a lifting mechanism 4 that translates (lifts) the projector body 2 in the vertical direction, and a control that controls the projector body 2 and controls the lifting mechanism 4 based on the shift amount h. Part (control means) 5.

  The projector main body 2 includes an operation unit 11 for a user to receive a video signal and give a command for aligning the projected video G with the screen SC, a display unit 12 for displaying the operation status of the projector 1 in a lamp display or a liquid crystal display, and a personal computer. A receiving unit 13 that receives a video signal from an external device such as a computer (PC), a video signal processing unit 14 that receives a video signal supplied from a PC or the like and converts it into video data for projection, and a projected video G A projection unit 15 that projects onto the screen SC, and is controlled by the control unit 5 described later.

  The operation unit 11 is a part that is located on the upper surface of the housing 16 of the projector body 2 and is operated by the user, and includes a power button 21 and an alignment button 22 for aligning the projection image G with the screen SC. . The display unit 12 includes an LED lamp, and notifies the user of the operation status of the projector 1 by turning on / off the LED lamp based on the operation of the projector 1.

  The receiving unit 13 is a USB connector connected to a PC or the like (not shown) via a network cable or the like (not shown) or a connector for connecting peripheral devices (for example, D-Sub, DVI-D, S terminal, etc.) Etc., and performs control related to data communication with the outside.

  The video signal processing unit 14 receives an externally supplied video signal and converts it into video data in a format that can be processed inside the projector 1. Then, image quality adjustments such as brightness adjustment, color balance adjustment, and contrast adjustment are performed on the converted video data.

  The projection unit 15 includes a liquid crystal panel 31, a liquid crystal panel control unit 32 that controls the liquid crystal panel 31, a light source lamp 33 that serves as a light source for projection light, a light source lamp control unit 34 that controls the light source lamp 33, and a light source lamp 33. Projection lens 35 for enlarging and projecting the projection light on the screen SC, and a lens control unit 36 for controlling the driving of the projection lens 35. The projection unit 15 of the present embodiment includes R, G, and B three-color liquid crystal panels 31 and synthesizes three-color images and projects them onto the screen SC.

  The screen information acquisition unit 3 includes a distance measuring sensor (distance measuring unit) 41 that measures the distance d between the projector main body 2 (projection lens 35) and the screen SC, and a camera that captures the screen SC and the projected video G (imaging unit). 42. Information acquired by the distance measuring sensor 41 and the camera 42 is temporarily stored in a RAM 82 described later, and is used when the deviation amount calculation program 91 is executed.

  The distance measuring sensor 41 is a distance sensor using a so-called semiconductor laser, and is disposed on the surface of the projector body 2 on the side of the projection lens 35 in parallel with the horizontal plane P of the projector body 2. And a distance d between the screen SC and the screen SC.

  The camera 42 is composed of a CCD camera or a CMOS camera, and is installed in the vicinity of the projection lens 35 of the projector body 2 so as to face the same direction as the optical axis A. The projected image G and the screen SC serving as a projection target thereof. And simultaneously.

  Next, the lifting mechanism 4 will be described with reference to FIG. The elevating mechanism 4 includes an upper base 51 on which the projector body 2 is placed, a lower base 52 disposed in parallel to the upper base 51, and an X link mechanism that translates the upper base 51 in the vertical direction relative to the lower base 52. 53, a lead screw 54 that is screwed into the X link mechanism 53 and moves the X link mechanism 53 to open and close, and a motor 55 that is connected to the lead screw 54 and rotates the lead screw 54 forward and backward. . The lifting mechanism 4 is housed in a housing box 56 that is integrated with the projector body 2 in terms of design.

  The upper base 51 includes a mounting plate 61 that is formed in a square shape so as to place the projector main body 2, and a pair of left and right upper horizontal pieces 62 that hang down from both ends of the mounting plate 61. . Further, at one end (front end) of the upper horizontal pieces 62, 62, a long hole 57 is formed to engage with both inclined links 72, 73 of the X link mechanism 53 described later.

  The lower base 52 includes a base 63 formed in a rectangular shape for fixing the elevating mechanism 4 in the storage box 56, and a pair of left and right lower horizontal pieces 64 rising from both end sides of the base 63. . The lower base 52 is disposed directly below the upper base 51, and has a form in which the upper base 51 is turned upside down. In addition, the lower horizontal pieces 64 and 64 are respectively formed with elongated holes 57 into which the inclined links 72 and 73 are engaged, similarly to the upper horizontal pieces 62 and 62.

  The X link mechanism 53 includes a pair of left and right X links 71 and 71 arranged in parallel to each other, and is interposed between the upper base 51 and the lower base 52. Both the X links 71 and 71 are configured by connecting a first inclined link 72 and a second inclined link 73 by a connecting pin 79 at an intermediate portion, and an upward end of the first inclined link 72 is connected to a support shaft 75. The lower end is engaged with the elongated hole 57 of the lower base 52 via the engagement pin 74. Further, the upper end of the second inclined link 73 is engaged with the elongated hole 57 of the upper base 51 via the engagement pin 74, and the lower end is rotatable to the lower base 52 via the support shaft 75. It is connected. Further, the two X links 71 and 71 are connected to each other by connecting bars 76 extending in the left-right direction at the connecting portions and outer end portions of the both inclined links 72 and 73, respectively. When both engaging pins 74 and 74 engaged with the long holes 57 and 63 of the lower base 52 move back and forth, the X link mechanism 53 performs an opening / closing leg operation. The upper base 51 moves parallel (up and down) with respect to the lower base 52 in the vertical direction. Note that the engaging pin 74, the connecting pin 79, and the support shaft 75 are formed integrally with each connecting bar 76, respectively.

  The lead screw 54 is screwed into the female screw member 77 and a nut-shaped female screw member 77 attached to the central portion of the connecting bar 76 located at the lower part of the front side connecting the ends of the X links 71 and 71. And a male screw member 78 connected to the motor 55 via a coupling.

  The motor 55 is constituted by a so-called geared motor, and is rotated forward and backward by the control unit 5 described later so that the projector main body 2 moves up and down by an amount of deviation h. When the male screw member 78 rotates in the forward and reverse directions by driving the motor 55, the female screw member 77 screwed to the male screw member 78 moves in the front-rear direction, and the X link mechanism 53 is operated to open and close. Thereby, the projector main body 2 moves up and down.

  The control unit 5 performs overall control of the projector 1, and controls a CPU (Central Processing Unit) 81, a RAM (Random Access Memory) 82 used as a work area (work area) when performing various processes, and the projector 1. And a flash ROM 83 in which a control program for controlling is stored (see FIG. 2).

  The flash ROM 83 stores a deviation amount calculation program (deviation amount calculation means) 91 for obtaining the deviation amount h of the projected video G with respect to the screen SC from the distance d and the vertical deviation amount H (see FIG. 2).

  The RAM 82 temporarily stores the information acquired in accordance with the measurement devices 41 and 42 and the deviation amount calculation program 91 and the projection angle θ1 of the projector main body 2 stored in advance (see FIG. 4). The CPU 81 calculates the shift amount h using information stored in the RAM 82 or the like according to the shift amount calculation program 91 of the flash ROM 83.

  Next, a method for calculating the shift amount h will be described in detail with reference to FIG. The solid line between the projection lens 35 shown in the figure and the screen SC indicates the optical axis A of the projection lens 35, and the projection angle θ1 is an angle with respect to a plane (horizontal plane P) extending horizontally from the projection lens 35. It is. Here, a method of calculating the shift amount h when projecting the projection video G from the projector 1 installed horizontally and with the optical axis A directed obliquely upward at the center of the screen SC installed vertically will be described. To do. First, prior to calculating the shift amount h, the projector 1 is placed in front of the screen SC. Then, the projected image G is focused on the screen SC, and the left and right ends of the screen SC and the projected image G are matched to set the projected image G so as not to be distorted into a trapezoid.

  Next, the distance d between the projection lens 35 of the projector main body 2 and the screen SC is measured by the distance measuring sensor 41, and the screen SC and the projected video G are imaged by the camera 42 at the same time. Then, the four corners of the screen SC are recognized from the captured screen image, and the intersection of the diagonal lines is recognized as the screen center point C1. Similarly, the four corners of the projected video G are recognized from the captured projected video G, and the intersection of the diagonal lines is recognized as the video center point C2. Thereafter, a vertical shift amount H between the screen center point C1 and the image center point C2 on the image is obtained. Based on the shift amount calculation program 91, the shift amount h of the projected video G with respect to the screen SC is acquired from the distance d and the shift amount H in the vertical direction (see FIG. 4A). Based on the acquired displacement amount h, the control unit 5 drives the above-described lifting mechanism 4 to raise the projector body 2 and projects the projected image G so as to fit the screen SC (see FIG. 4B). ).

(Second Embodiment)
Next, with reference to FIG. 5 and FIG. 6, the projector 1 and the calculation method of the deviation amount h according to the second embodiment will be described. In order to avoid duplicate descriptions, only different parts are described. The projector 1 further includes an inclination measurement sensor 43 that detects an alignment angle θ2 of the projector body 2 in the screen information acquisition unit 3 (see FIG. 2). The tilt measurement sensor 43 is configured by a tilt sensor that captures a change in angle with a corresponding voltage output, and is built in the projector 1. Then, the angle of the state in which the lower end of the projection image G is aligned with the lower end of the screen SC with respect to the horizontal plane P is measured (button operation).

  As shown in FIG. 5, the elevating mechanism 4 raises and lowers the movable column 101 on which the movable column 101 is placed and fixed, the fixed column 102 on which the movable column 101 is slidably engaged in the up and down direction, and the movable column 101. It has a lead screw 54, a motor 55 that rotates the lead screw 54 forward and backward, and a cover box 103 that accommodates these.

  The movable support column 101 includes a circular flange-shaped upper circular plate 111 and a cylindrical upper cylindrical body 112 attached to the center of the upper circular plate 111, and the projector main body 2 via the upper circular plate 111. It is screwed to.

  The fixed support column 102 includes a lower circular plate 113 having a circular flange shape, and a lower cylindrical body 114 that is attached to the center of the lower circular plate 113 and slidably engages with the upper cylindrical body 112 as an outer cylinder. And screwed to the cover box 103 via the lower disk 113. In this case, the movable support column 101 is configured to slide up and down with respect to the fixed support column 102 in a rotation-stopped state. That is, the movable support column 101 and the fixed support column 102 are nested and are spline-engaged.

  The lead screw 54 is screwed into the female screw member 77 provided at the end of the upper cylindrical body 112 facing the upper circular plate 111 and the bearing 115 provided in the lower cylindrical body 114 while being screwed into the female screw member 77. And a bevel gear 116 that is provided at the end of the female screw member 77 and transmits the driving force from the motor 55 to the male screw member 78. Also in this case, the projector main body 2 is raised and lowered by driving the motor 55 based on the raising / lowering command from the control unit 5.

  Next, a method for calculating the shift amount h will be described with reference to FIG. Here, the illustrated imaginary line from the projection lens 35 to the screen SC surface indicates the optical axis A at the time of placement. A solid line indicates the optical axis A when the projector body 2 is tilted by the user. First, the distance d between the projection lens 35 and the screen SC is measured by the distance measuring sensor 41, and the projection image G with respect to the horizontal plane P is aligned with the screen SC by the tilt measuring sensor 43. The angle θ2 is measured (see FIG. 6A). Based on the principle of triangulation, the height from the horizontal plane P to the screen center point C1 (position information h1 on the screen SC) is acquired from the distance d and the fitting angle θ2.

  On the other hand, since the shift amount h2 at the inclination angle θ1 and the distance d can be obtained by the shift amount calculation program 91, the height from the horizontal plane P to the video center point C2 of the projected video G (position information h2 of the projected video G) can be acquired. The shift amount h is obtained by subtracting the shift amount h2 from the SC position information h1. Based on the acquired displacement amount h, the control unit 5 drives the lifting mechanism 4 to raise the projector body 2 and projects the projection video G on the screen SC (see FIG. 6B).

  According to the above configuration, the shift amount h of the projection video G with respect to the screen SC is acquired from the position information h1 of the screen SC and the position information h2 of the projection video G, and the projector body 2 is moved up and down by the acquired shift amount h. Thus, it is possible to automatically project and project the projected video G on the screen SC.

(Modification 1)
In addition, as a calculation method of the shift amount h of the projection image G with respect to the screen SC, the shift amount h is similarly determined from the shift angle θ3 between the horizontal plane P and the projection angle θ1 and the fitting angle θ2 when the projector body 2 is mounted. May be calculated.

(Modification 2)
In addition, the raising / lowering operation of the projector 1 by the raising / lowering mechanism 4 can also be performed manually. In this case, a display for displaying the remaining shift amount (residual shift amount) to be moved up and down is installed on the outer surface of the cover box 103 or the storage box 56, and the rotation for rotating the male screw member 78 instead of the motor 55 is provided. Has a handle (both not shown). The user may rotate the rotary handle on the basis of the displayed residual deviation amount to raise and lower the projector main body 2 to a desired height.

(Modification 3)
A liquid crystal panel 31 is used in the projection unit 15 of the projector body 2. However, the present invention is not limited to this, and a micromirror or the like may be used. As the micromirror, for example, a DMD (Digital Micromirror Device) can be used.

It is an external appearance schematic diagram of a projector. It is the figure which showed the structure of the projector. It is the schematic diagram which showed the raising / lowering mechanism in 1st Embodiment. It is the figure which showed the calculation method of the deviation | shift amount in 1st Embodiment. It is the schematic diagram which showed the raising / lowering mechanism in 2nd Embodiment. It is the figure which showed the calculation method of the deviation | shift amount in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector 2 ... Projector main body 3 ... Screen information acquisition part 4 ... Elevating mechanism 5 ... Control part 41 ... Distance measurement sensor 42 ... Camera 43 ... Inclination measurement sensor 51 ... Upper base 52 ... Lower base 53 ... X link mechanism 54 ... Lead Screw 55 ... Motor 91 ... Deviation amount calculation program 101 ... Movable strut 102 ... Fixed strut θ1 ... Projection angle θ2 ... Matching angle d ... Distance h ... Deviation amount G ... Projected image SC ... Screen H ... Vertical displacement amount

Claims (5)

A projector configured to fit a projected image on a screen while maintaining a projection angle,
A projector main body for projecting the projection image on the screen;
Screen information acquisition means for acquiring a vertical shift amount of the projected image with respect to the screen;
An elevating mechanism for elevating and lowering the placed projector body, the projector body being placed;
A projector comprising: control means for controlling the elevating mechanism so that the position of the screen and the position of the projected image in the vertical direction coincide with each other based on the shift amount. The screen information acquisition means includes a distance measurement means for measuring a distance between the projector main body and the screen;
Imaging means for imaging the screen and the projected image;
Based on the imaging result of the imaging means, the vertical direction deviation amount acquisition means for acquiring the vertical direction deviation amount between the screen and the projection image;
The projector according to claim 1, further comprising: a deviation amount calculating unit that calculates a deviation amount of the projected image with respect to the screen from the distance and the vertical direction deviation amount. The screen information acquisition means includes a distance measurement means for measuring a distance between the projector main body and the screen;
An inclination angle detecting means for detecting an alignment inclination angle in a state where the projection image is aligned with the screen;
The projector according to claim 1, further comprising: a deviation amount calculating unit that calculates a deviation amount of the projection image with respect to the screen from the distance and the fitting inclination angle. The lifting mechanism includes an upper base on which the projector main body is placed,
A lower base disposed parallel to the upper base;
An X-link mechanism that is interposed between the upper base and the lower base and translates the upper base in the vertical direction with respect to the lower base;
A lead screw screwed into the X link mechanism to move the X link mechanism to open and close legs;
The projector according to claim 1, further comprising: a motor connected to the lead screw and rotating the lead screw forward and backward. The elevating mechanism includes a movable support column on which the projector main body is placed,
A fixed strut that the movable strut is slidably engaged in the up-down direction in a rotation-stopped state;
A lead screw that is screwed into the movable column and moves the movable column up and down;
The projector according to claim 1, further comprising: a motor connected to the lead screw and rotating the lead screw forward and backward.

Images