JP4144497B2 - projector - Google Patents

Description

  The present invention relates to a technology of a projected image of a projector.

  Projectors that project images on a screen or the like have been rapidly spreading in recent years because they can be used for home theaters and the like.

  When a projector is placed in a room and projected onto a screen or a wall of the room, etc., if the horizontal and vertical relative angles to the screen etc. are not vertical, the entire contour of the projected image is deformed (hereinafter referred to as shape (It is called distortion). For this reason, in order to adjust the orientation of the projector to the angle with the screen or the like, the projector itself is moved in the horizontal direction and the vertical direction to correct the shape distortion. On the other hand, some projectors have a function of correcting a shape distortion by processing a projected image. In order to perform this correction, there is known a technique in which a test pattern is displayed on a screen or the like, observed with a sensor, and automatically corrected (for example, Patent Document 1).

  Also, it is known that the angle of projection on the screen is detected, the shape distortion in the vertical direction is automatically corrected, and the shape distortion in the horizontal direction is corrected manually (for example, Patent Document 2).

Japanese Patent Laid-Open No. 2001-61121 (5th page, FIGS. 3-4) Japanese Patent Laid-Open No. 2003-57752 (pages 4-5, FIG. 5)

  By the way, in the case of a presentation application, the projector itself is often moved and used. On the other hand, when watching movies on a screen or the like in a home room, the projector installation position is often not changed and the projection angle is often changed. Is very annoying. On the other hand, if automatic correction is performed in this case, it takes time to display the test pattern and observe the angle, which is inconvenient for the user.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a projector that can easily correct the shape distortion of a projected shape projected on a screen or the like.

  In order to solve the above-described problems, the present invention provides a projector that includes a base part and a projection part that is movably provided with respect to the base part, and a projection surface by projection light from the projection part. A correction unit that corrects a shape distortion that may occur in the light projection area, and a plane defined by the movement in a plane perpendicular to a virtual axis that passes through the base unit and extends in the vertical direction. A detection unit for detecting a relative angle; a data storage unit for storing the latest relative angle information before and after the current detected by the detection unit; and a newest correction amount information before and based on the relative angle information; and The relative angle information and the correction amount information stored in the data storage unit, the newest relative angle information detected by the detection unit and the newest correction amount information based on the newest relative angle information, Based on the difference, and summarized in that and a control unit for correcting the shape distortion gives a correction command signal to the correction unit.

  According to this, the said base part and the said projection which are prescribed | regulated by the said movement in the surface orthogonal to the virtual axis which passes along the said base part and is extended in a perpendicular direction with the projection part provided with respect to the base part. A detection part detects the relative angle between parts. The newest relative angle information before and after the present detected by the detection unit and the latest correction amount information before and based on the relative angle information are stored in the data storage unit. Based on the difference between the correction angle information before and the relative angle information stored in the data storage unit and the newest relative angle information detected by the detection unit and the latest correction amount information based on the relative angle information. The shape distortion can be corrected. Accordingly, it is possible to provide a projector that can correct shape distortion in a short time without placing a burden on installation and setting on the user.

  In the projector according to the aspect of the invention, the projector includes a pedestal portion and a projection unit that is movably provided with respect to the pedestal unit, and projects light onto a projection surface by projection light from the projection unit. Detecting a relative angle between the base and the projection defined by the movement in a plane including a correction unit that corrects a shape distortion that may occur in the region and a virtual axis that passes through the base and extends in the vertical direction. A detection unit, a newest relative angle information before and after the present detected by the detection unit, and a newest correction amount information before and after the present based on the relative angle information, and a data storage unit stored in the data storage unit Based on the difference between the detected relative angle information and the correction amount information and the newest relative angle information detected by the detection unit and the newest correction amount information based on the newest relative angle information. There are, and summarized in that and a control unit for correcting the shape distortion gives a correction command signal to the correction unit.

  According to this, the said base part prescribed | regulated by the said movement and the said projection part in the surface containing the virtual axis | shaft which passes along the said base part and is extended in the perpendicular direction with the projection part provided with respect to the base part. The detection unit detects the relative angle between them. The newest relative angle information before and after the present detected by the detection unit and the latest correction amount information before and based on the relative angle information are stored in the data storage unit. Based on the difference between the correction angle information before and the relative angle information stored in the data storage unit and the newest relative angle information detected by the detection unit and the latest correction amount information based on the relative angle information. The shape distortion can be corrected. Therefore, it is possible to correct the shape distortion in a short time without placing a burden on installation and setting on the user.

  In the projector according to the aspect of the invention, the projector includes a pedestal portion and a projection unit that is movably provided with respect to the pedestal unit, and projects light onto a projection surface by projection light from the projection unit. A correction unit that corrects a shape distortion that may occur in a region, an in-plane orthogonal to a virtual axis that extends in the vertical direction through the base unit, and an angle formed by a reference direction of the virtual axis and a reference direction of the projection unit, A detection unit that detects a relative angle between the base unit and the projection unit defined by movement; a newest relative angle information before and after the present detected by the detection unit; and a most previous unit based on the relative angle information. A data storage unit for storing new correction amount information, the relative angle information and the correction amount information stored in the data storage unit, and the newest relative angle information detected by the detection unit, and Serial based on the difference between the most recent correction amount information based on the most recent relative angle information, and summarized in that and a control unit for correcting the shape distortion gives a correction command signal to the correction unit.

  According to this, by the said movement in the angle which the reference direction of the virtual axis which passes along the said base part and extends in the perpendicular direction with the projection part provided so that movement with respect to the base part, and the reference direction of the said projection part comprises A detection part detects the relative angle between the said base part prescribed | regulated and the said projection part. The newest relative angle information before and after the present detected by the detection unit and the latest correction amount information before and based on the relative angle information are stored in the data storage unit. Based on the difference between the correction angle information before and the relative angle information stored in the data storage unit and the newest relative angle information detected by the detection unit and the latest correction amount information based on the relative angle information. The shape distortion can be corrected. Therefore, it is possible to correct the shape distortion in a short time without placing a burden on installation and setting on the user.

  Further, in the projector according to the aspect of the invention, the platform includes a movement detection unit, and when the movement detection unit detects the movement of the platform, the newest before and presently stored in the data storage unit. The gist is not to perform correction based on the correction amount information.

  According to this, the said base part has a movement detection part, and when the said movement detection part detects the movement of a projector, the newest correction amount information before the present memorize | stored in the said data storage part Therefore, it is possible to provide a user-friendly projector that does not perform erroneous correction.

  Hereinafter, a case where the present invention is applied to a DVD player, a video tape recorder, a video camera, a DVD built-in camera and the like and a projector will be described as an example with reference to the drawings. In addition, the embodiment shown below does not limit the content of the invention described in the claim at all. Further, all of the configurations shown in the following embodiments are not necessarily essential as means for solving the invention described in the claims.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments of the invention will be described below with reference to FIGS.

  FIG. 1 is a perspective view showing a projector according to the present embodiment. The projector 1 includes a DVD reproducing unit 3 as a base unit 4 and a connecting unit 50, a concave spherical body 4 a is provided above the connecting unit 50, and a convex shape provided below the projecting unit 2. The spherical body 2a is engaged. It can move in two axes (X axis and Y axis) orthogonal to each other in a plane orthogonal to the Z axis as a virtual axis passing through the base part 4 and extending in the vertical direction, and can rotate around the Z axis. Can move. That is, the projector 1 is placed on a mounting table (not shown), and the projection unit 2 can move in any direction within the X axis-Y axis plane with respect to the table unit 4. It can be rotated around the Z axis at a point. In the present embodiment, when the base 4 and the projection 2 are overlapped by the concave spherical body 4a and the convex spherical body 2a, the projection 2 is substantially horizontal. The projection unit 2 tilts (hereinafter referred to as tilting) when the projection unit 2 is moved in any direction within the X-axis-Y-axis plane with respect to the base unit 4 from the overlapped state. In this case, the directions of the X axis and the Y axis are independent of the direction of the optical axis of the projection light projected from the projection lens unit 2b. Further, when the size of the projection unit 2 is larger than the size of the base part 4, the Z axis may not pass through the base part 4.

  The DVD reproducing unit 3 is provided with an insertion port 3a, and a DVD recording medium D can be inserted so that reproduction from the DVD or recording on the DVD can be performed. An operation unit 5 is provided on the upper surface of the projection unit 2. The operation unit 5 includes a plurality of switches and inputs signals for various operations of the projector 1, and an image reproduced by the DVD reproduction unit 3 is projected from the projection lens unit 2 b onto a screen or the like.

  FIG. 2 is a perspective view of the operation unit. The operation unit 5 includes a power switch 6, a shape distortion correction switch 7, a reproduction switch 8 including a stop switch 8 a that stops reproduction on the DVD reproduction unit 3, and a lamp switch 9 that turns on and off the lamp of the light source unit. Yes. The power switch 6 is a switch for turning on / off the power of the projector 1. The shape distortion correction switch 7 is a switch for correcting the shape of the projected projection screen so that it approximates a quadrangle because the shape of the projected screen is distorted due to the relative position between the projection unit 2 and the screen. The shape distortion correction switch 7a is a switch for correcting the upper part of the projected image narrowly. The shape distortion correction switch 7b is a switch that corrects the left side of the projected image narrowly. The shape distortion correction switch 7c is a switch for correcting the lower part of the projected image narrowly. The shape distortion correction switch 7d is a switch for correcting the right side portion of the projected image narrowly.

  Next, the relative angle when the projection unit tilts and rotates with respect to the base unit will be described with reference to FIGS. FIG. 3 is a side view when the projection unit 2 tilts toward the screen S with respect to the base unit 4 in the X-axis-Y-axis plane. The convex spherical body 2a of the projection unit 2 is tilted only in the right direction of the paper surface in FIG. In this case, it is assumed that it is not tilted in the direction perpendicular to the paper surface in FIG. The optical axis K of the projection light projected from the projection lens unit 2 b of the projection unit 2 as the projection unit 2 tilts obliquely upward to the right with respect to the base unit 4 is tilted with respect to the horizontal line H. This angle of inclination is referred to as the latest current relative angle (hereinafter referred to as the current relative angle) θ1 between the platform 4 and the projection unit 2 as relative angle information. Moreover, the case where the optical axis K is tilted upward from the horizontal line H is defined as + (plus) θ1. Conversely, the case where the optical axis K is tilted downward from the horizontal line H is defined as − (minus) θ1. The projection unit 2 includes an inclinometer 30 as a detection unit. The inclinometer 30 detects the current relative angle θ1. (The inclinometer 30 will be described in detail in FIG. 7)

  FIG. 4 is a plan view when the projection unit 2 only rotates about the Z axis with respect to the base unit 4. The projection unit 2 is rotated only about the virtual rotation axis P included in the Z axis as a virtual axis extending in the vertical direction with respect to the base unit 4. The reference direction Ka of the virtual axis indicates the reference direction of the Z axis. The virtual axis reference direction Ka may be an arbitrary direction. A direction serving as a reference when rotating around the so-called Z axis is determined. The latest relative angle (hereinafter referred to as the current relative angle) formed by the reference direction Ka of the virtual axis and the optical axis K of the projection unit 2 as the reference direction of the projection unit after the projection unit 2 is rotated with respect to the base unit 4. This is called β1). The current rotation relative angle β1 as relative angle information is detected by a rotation angle detector 80 (described in detail in FIG. 7) as a detector. When the optical axis K after rotation with respect to the reference direction Ka is rotated clockwise, it is defined as + (plus) β1. Conversely, when it rotates, it is set to − (minus) β1.

  In FIG. 3, it has been described that the projection unit 2 is tilted in only one direction with respect to the pedestal 4. Of course, the projection unit 2 is in any direction within the X axis-Y axis plane with respect to the pedestal 4. Can tilt. In FIG. 4, the case where the projection unit 2 rotates only around the virtual rotation axis P with respect to the base unit 4 has been described. Of course, the projection unit 2 relative to the base unit 4 has the X axis − It can be rotated around the Z-axis at each location tilted in any direction within the Y-axis plane.

  FIG. 5 is a perspective view when the projection unit is directed obliquely upward and rotated and projected onto the screen. The projector 1 is placed on the mounting table 14. In the X axis-Y axis plane, the projection unit 2 is tilted in the direction of the screen S as the projection surface with respect to the base unit 4 and is rotated in the plane including the Z axis. As the convex spherical body 2a provided on the projection unit 2 slides forward along the curvature of the concave spherical body 4a provided on the base unit 4, the projection unit 2 tilts so as to face obliquely upward. And the projection part 2 is rotated with respect to the base part 4. FIG. The contour S1 of the projected screen in this case has the shape shown in the figure because the distance that the projection light from the projection unit 2 reaches the screen S differs in the vertical direction and the horizontal direction. Since the distance of the corner portion T3 of the contour S1 is the longest, the shape distortion is the largest. Corners T1, T2, and T4 are formed by the relative distance between the projection unit 2 and the screen S, respectively. In other words, the contour S1 is formed as a result of combining the geometric distortion in the vertical direction and the geometric distortion in the horizontal direction.

  FIG. 6 is an explanatory diagram of a method for correcting shape distortion when the projection unit is turned obliquely upward and rotated. This is a method of correcting the contour S1 formed on the screen S by correcting the image formed on the liquid crystal light valve R. The liquid crystal light valve R is composed of many pixels, and in particular, the pixels in the horizontal direction are driven and controlled as one line. Control for compressing and reducing the number of pixels to be displayed in this line and control for compressing and reducing the number of lines to be displayed on the liquid crystal light valve R are driven by the CPU 100 as the control unit to drive the light modulation optical system as a correction unit. The control unit 130, the shape distortion correction control unit 131 as a correction unit, and the shape distortion manual correction control unit 132 as a correction unit (see FIG. 8 for 100 to 132). The shape distortion correction method in the vertical direction performs control to compress and reduce the number of pixels displayed by the pixels in the line, and the shape distortion correction method in the horizontal direction performs control to compress and reduce the number of display lines in the line. . As shown in FIG. 5, since the projection unit 2 is inclined obliquely upward, a shape distortion that extends is generated above the projection screen, and at the same time, the projection unit 2 is rotated, so that the shape extends in the left direction in the figure. Distortion is occurring. The correction method in such a case is such that, for example, the corners T2, T3, and T4 are corrected in the vertical direction and the horizontal direction with reference to the corner portion T1, and the projection screen is made substantially square S2. . In addition, when one of the four switches 7a to 7d for correcting the shape distortion in each direction provided in the shape distortion correction switch 7 of the operation unit 5 is pressed once, the switch is given. Based on the signal, the pixel number compression or line number compression in the direction corresponding to the pressed switch is executed by a preset amount.

  FIG. 7 is a cross-sectional view when the projection unit is tilted with respect to the base unit. A connecting portion 50 is disposed above the DVD reproducing portion 3 as a part of the base portion 4. A concave spherical body 4a is provided above the connecting portion 50, and engages with a convex spherical body 2a provided below the projection unit 2, so that the projection unit 2 is within the X-axis-Y-axis plane. Is configured to be tiltable with respect to the base 4. The figure shows a state in which the projection unit 2 is tilted with respect to the base unit 4 including the DVD reproducing unit 3 and the connecting unit 50, and the contact portion 10 b of the lower case 10 is in contact with the hole 50 a of the connecting unit 50. . Thus, the projection unit 2 can be arbitrarily tilted within the range until the hole 50a and the contact portion 10b come into contact with the base unit 4. Further, the projection unit 2 can rotate around the Z axis with respect to the base unit 4 at an arbitrary position within the range.

  The connecting part 50 is provided with two gyro sensors 33 (only one is shown in FIG. 7) as a movement detecting part for detecting whether or not the base part 4 is moved. The projection unit 2 includes an optical system that projects an image, an inclinometer 30 as a detection unit, and an operation unit 5. Further, a rotation angle detection unit 80 is provided as a detection unit that detects the newest relative angle by which the projection unit 2 is rotated around the Z axis with respect to the base unit 4.

  The two gyro sensors 33 of the connecting portion 50 as the base portion are, for example, vibration gyro sensors. When the base portion 4 is moved, one of the two vibration gyro sensors moves in the horizontal direction. The other one is configured to detect vertical movement. The gyro sensor 33 is driven by the secondary power source even when the power source of the projector 1 is cut off, and always detects whether or not the base unit 4 has been moved.

  The optical system for projecting the image of the projection unit 2 uses a color separation optical system using a dichroic mirror 12 or the like to emit light beams emitted from a light source lamp (not shown) of the light source unit 11 to the three primary colors red, green, and blue. Separate into colored light. The separated color light is modulated according to image information for each color light by three light modulation devices using a liquid crystal light valve R and the like, and each color light after the image modulation is synthesized by the cross dichroic prism 13, and the projection lens unit The image is enlarged and projected as a color image via 2b.

  The inclinometer 30 of the projection unit 2 detects a current relative angle θ1 that is an angle formed by the optical axis K and the horizontal line H. The inclinometer 30 is filled with a liquid 60, and includes two pairs of electrodes 61 and 62 each having a pair of electrodes that sandwich the liquid 60 in a direction perpendicular to the paper surface in FIG. The electrode 61 and the electrode 62 are inclined at the same angle as the angle at which the projection unit 2 is inclined. In FIG. 7, for example, when the right side of the projection unit 2 is inclined so as to be obliquely higher, the liquid surface 60 a of the liquid 60 is horizontal, and thus the capacitance detected by the electrode 61 is sandwiched between the liquids 60. As the amount of increases, it increases proportionally. Further, the capacitance detected by the electrode 62 decreases in proportion to the amount of the liquid 60 that is sandwiched. On the other hand, when the left side of the projection unit 2 is inclined so as to increase obliquely upward, the capacitance detected by the electrode 61 is decreased and the capacitance detected by the electrode 62 is increased. That is, the current relative angle θ1 is detected by the difference in capacitance between the electrode 61 and the electrode 62. Further, the dedicated control unit compares the capacitances of the electrode 61 and the electrode 62 to determine, for example, whether the right side of the projection unit 2 is facing upward or downward. it can. The current relative angle θ1 detected by the inclinometer 30 and converted into angle data by the dedicated control unit is the latest relative angle data buffer 103a (see FIG. 8) in the RAM as a data storage unit for relative angle information. Stored as angle data. The inclinometer 30 is arranged in parallel with the optical axis projected from the projection lens unit 2b, and is attached so that the current relative angle θ1 becomes ± zero when the projection unit 2 is horizontal.

  The operation unit 5 of the projection unit 2 has been described with reference to FIG.

  The rotation angle detection unit 80 detects the latest rotation relative angle (hereinafter referred to as the current rotation relative angle) β1 at which the projection unit 2 rotates about the Z axis with respect to the base unit 4. A spherical fulcrum 81 a that the shaft 81 has at the top is engaged with a fulcrum guide surface 10 a of the lower case 10 of the projection unit 2. Even when the projection unit 2 tilts with respect to the base unit 4, the shaft 81 always faces the vertical direction at the fulcrum 81 a and the fulcrum guide surface 10 a. A weight 82 is fixed in the vicinity of the center portion, and the shaft 81 reliably maintains the vertical direction by the weight of the weight 82. A magnet 83 is fixed to the upper end of the shaft 81, and a ring-shaped magnet 84 fixed to the lower case 10 is disposed so as to surround the magnet 83 with a gap and is attached so as to attract each other. It is magnetized. That is, when the projection unit 2 is rotated, the magnet 84 fixed to the lower case 10 rotates, and the magnet 83 attracted by the magnet 84 obtains a rotational force to rotate the shaft 81. Since a frictional force is generated between the fulcrum 81a and the fulcrum guide surface 10a due to the weight of the shaft 81 and the weight 82, if the shaft 81 can rotate without slipping due to this frictional force, the magnet 83 and the magnet 84 are not provided. Also good. That is, the magnet 83 and the magnet 84 are for reliably transmitting the rotation of the projection unit 2 to the shaft 81.

  The lower end portion of the shaft 81 is spline-processed and is disposed so as to be rotatable together with the encoder portion 85. The encoder unit 85 is configured to rotate the slit disk 88 via the friction wheel 87 between the encoder unit 85 and the slide body 86 that can slide on the guide surface 52 of the connecting unit 50. The slide body 86 is fitted to the shaft 81 so that the rotation of the shaft 81 and the force in the longitudinal direction of the shaft 81 are not received. The slide body 86 follows the shaft 81 and moves on the guide surface 52 of the connecting portion 50, and the friction wheel 87 of the encoder portion 85 is always in contact with the slide body 86. The sliding body 86 is set so that the frictional force with the guide surface 52 generated by the weight of the sliding body 86 is larger than the reaction force received when the friction wheel 87 rotates. That is, when the shaft 81 rotates together with the projection unit 2, the encoder unit 85 disposed at the other end of the magnet 83 rotates. The rotation of the encoder unit 85 is transmitted to the friction wheel 87 that is in contact with the slide body 86 and rotates the slit disk 88 that is coaxially disposed.

  In the vicinity of the slit disk 88, a measuring unit 89 including three pairs of light emitting elements (for example, light emitting diodes) and light receiving elements (for example, phototransistors) is disposed, and an encoder control unit 107 (see FIG. 8). Electrically connected. The number of slits that have passed through the movement of the slit provided on the slit disk 88 by one of the three pairs of light emitting element and light receiving element is counted, and the counted data is sent to the encoder control unit 107 and converted. Thus, the current rotational relative angle β1 is obtained. Further, the phase of the A phase signal applied to the other pair of light emitting elements and the light receiving element among the three pairs is configured to be approximately 90 degrees different from the phase of the B phase signal applied to the pair of light emitting elements and the light receiving element. For example, the A-phase signal is examined at the time of the rise of the B-phase signal, and the rotation direction is detected by forward rotation if 1 and reverse rotation if 0. Further, the other pair of light emitting elements and light receiving elements of the three pairs is provided with one slit on the disk of the slit disk 88 and configured to detect this one slit. . That is, the zero position in the rotation direction is detected. For this reason, when the projection unit 2 is rotated around the axis of the shaft 81 (around the Z axis) at an arbitrary position within the range in which the projection unit 2 can move with respect to the base unit 4, the current rotation relative angle β1 is set. It can be measured. The relative angle data of the current rotation relative angle β1 is stored as the newest relative angle data in the current angle data buffer 103a (see FIG. 8) of the RAM as the data storage unit.

  FIG. 8 is an electrical configuration diagram of the projector 1. The projector 1 includes a CPU (Central Processing Unit) 100, a ROM (Read Only Memory) 101, an EEPROM (Electrically Erasable Programmable Read Only Memory) 102, and a RAM (Random Access Memory) 103 as control units. In addition, a user interface (hereinafter referred to as a user I / F) 104, a DVD playback unit 3, a projection unit 2, an inclinometer control unit 105, a gyro sensor control unit 106, and an encoder control unit 107 are provided. 110 are electrically connected to each other via 110. Further, the image processing unit 121 of the decoder unit 120 of the DVD playback unit 3 and the light modulation optical system drive control unit 130 are electrically connected by a dedicated data bus 119. The CPU 100 executes various operations based on control programs and various application programs stored in the ROM 101 and the EEPROM 102. The EEPROM 102 is a ROM that can electrically rewrite the contents of a control program and various application programs. The RAM 103 stores data and programs being processed, and when the projector 1 is turned off, the contents of the memory in the RAM 103 are automatically deleted.

  The DVD playback unit 3 inserts the recording medium D and plays back images and sounds recorded on the DVD. The reproduced image data is sent to the light modulation optical system drive control unit 130 via the data bus 119, and is imaged for each of the three primary colors of light by the three liquid crystal light valves R. The light from the light source unit 11 is modulated by the liquid crystal light valve R, synthesized by the cross dichroic prism 13, and enlarged and projected on the screen S as a color image via the projection lens unit 2b.

  In addition to the optical system described above, the projection unit 2 includes a shape distortion correction control unit 131 that corrects the shape distortion of the projection screen, and a shape distortion manual correction control unit 132 that corrects the shape distortion of the projection screen based on a signal from a manual switch. And an optical cooling drive control unit 134 that drives and controls the optical cooling unit 133 that cools the liquid crystal light valve R, and a light source drive control unit 135 that drives and controls the light source unit 11.

  The CPU 100 is configured to input a signal based on the operation of each switch 6 to 9 (shown in FIG. 2) provided in the operation unit 5 via the user I / F 104. That is, the CPU 100 executes various processes based on the control program and various application programs according to signals based on operations of the switches 6 to 9 provided in the operation unit 5.

  When the projection unit 2 is tilted with respect to the base unit 4 in the X-axis-Y-axis plane, the capacitance between the two pairs of electrodes generated by the inclinometer 30 is sent to the inclinometer control unit 105 as a detection unit. Then, the difference between the two capacitances and the magnitude relationship are obtained, and the obtained data is converted into relative angle information, and the current angle data buffer 103a in the RAM 103 stores the newest relative angle data of the current relative angle θ1. Once memorized. The signal counted by the encoder unit 85 is sent to the encoder control unit 107 serving as a detection unit, and the counted data is converted into a relative angle and the rotation direction is analyzed, and the result is stored in the current angle data in the RAM 103. The buffer 103a temporarily stores the newest relative angle data of the current rotation relative angle β1. Further, based on the respective relative angle data (current relative angle θ1 and current rotation relative angle β1) stored in the current angle data buffer 103a, the shape distortion correction control unit 131 and the shape distortion manual correction control unit as a correction unit. The latest correction amount (hereinafter referred to as the current correction amount) δ1 data among the signals executed by the 132 is calculated by the CPU 100 by reading the application program from the ROM 101 or the EEPROM 102 and calculating the calculated result as the current correction amount δ1. As the latest correction amount in the current correction amount data buffer 103b in the RAM 103.

  Each of the newest current relative angle data and the newest current correction amount data is stored data for correction at the next use, for example, when a signal for turning off the lamp switch 9 of the operation unit 5 is given. Is stored in the data storage unit 111 of the EEPROM 102. The previous angle data is stored in 111a and the previous correction amount data is stored in 111b. That is, the current relative angle θ1 is set as the previous relative angle θ2, the current rotation relative angle β1 is set as the previous rotation relative angle β2, and the current correction amount δ1 is set as the previous correction amount δ2. Each is stored as the newest data.

  When the projector 1 is turned on next time, the CPU 100 reads the previous angle data 111a and the previous correction amount data 111b stored from the data storage unit 111 of the EEPROM 102, and temporarily stores each data in the RAM 103. Are stored in the previous angle data buffer 103c and the previous correction amount data buffer 103d. For example, based on a signal that the lamp switch 9 is pressed and turned ON, the CPU 100 detects the latest relative angle data (current relative angle θ1 and current rotation) detected by the inclinometer 30 and the rotation angle detection unit 80, respectively. Relative angle β1) is acquired and stored as current relative angle data in the current angle data buffer 103a of the RAM 103. The CPU 100 reads the application program from the ROM 101 or the EEPROM 102 and obtains the difference between the previous angle (θ2, β2) data buffer 103c and the current angle (θ1, β1) data buffer 103a. The obtained difference in angle data is temporarily stored in the angle difference buffer 103e in the RAM 103 as the newest relative angle difference data. The CPU 100 adds an amount for compensating the relative angle difference to the previous correction amount δ2 based on the relative angle difference stored in the angle difference buffer 103e, obtains a correction amount necessary for the current relative angle condition, and performs shape distortion correction control. To the unit 131 as a new correction amount. The shape distortion correction control unit 131 corrects a signal used for display in the light modulation optical system drive control unit 130.

  After that, every time the movement of the projection unit 2 relative to the base unit 4 is detected, the shape distortion of the projection screen is corrected. That is, when the projection unit 2 is moved with respect to the base unit 4, the relative angle detected by the inclinometer 30 and the rotation angle detection unit 80 changes. The CPU 100 detects the change and stores (rewrites) the data in the current angle data buffer 103a in the previous angle data buffer 103c as the latest relative angle information before the current time. Similarly, the data in the current correction amount data buffer 103b is stored (rewritten) in the previous correction amount data buffer 103d as the latest correction information before the current time. Thereafter, the CPU 100 rewrites the newly obtained relative angle data as the latest current relative angle data as the data in the current angle data buffer 103a of the RAM 103. Based on the rewritten current angle data buffer 103a, the CPU 100 calculates the current correction amount δ1, and stores (rewrites) the current correction amount data buffer 103b as the newest current correction amount δ1. Subsequently, the CPU 100 calculates the angle difference between the current angle data buffer 103a and the previous angle data buffer 103c, and stores (rewrites) the calculation result in the angle difference buffer 103e. The CPU 100 adds an amount for compensating the relative angle difference to the previous correction amount δ2 based on the relative angle difference stored in the angle difference buffer 103e, obtains a correction amount necessary for the current relative angle condition, and performs shape distortion correction control. To the unit 131 as a new correction amount. The shape distortion correction control unit 131 corrects a signal used for display in the light modulation optical system drive control unit 130.

  The gyro sensor 33 and the gyro sensor control unit 106 as the movement detection unit are driven by the secondary power source even when the power source of the projector 1 is cut off, and always detect whether or not the projector 1 has been moved. The gyro sensor control unit 106 holds data indicating whether movement has been detected. When the projector 1 is turned on, the CPU 100 reads data relating to movement held by the gyro sensor control unit 106. If this data is data indicating no movement, the shape distortion correction control unit 131 is caused to execute shape distortion correction by the method described above. However, if this data is data indicating that movement has been detected, the CPU 100 does not read the previous angle data 111a and the previous correction amount data 111b from the EEPROM 102, and the inclinometer 30 and the rotation angle detection unit 80 Current relative angle data is acquired from the data, and the correction of only the vertical direction is executed by the shape distortion correction control unit 131 using the data of the current relative angle θ1 of the inclinometer 30. Further, correction by the user pressing the switch of the operation unit 5 is also possible.

  Here, the gyro sensor 33 may detect, for example, the vibration of the floor where a person walks in the room where the projector 1 is placed. End up. For this reason, movement within a predetermined range including vibration is allowed, and movement within the predetermined range is determined as no movement.

  Next, a method for correcting a projected screen projected on a screen or the like in the present embodiment will be described. When playing back the recording medium D inserted in the DVD playback unit 3 to watch a movie or the like, first, the projector 1 and the screen S to be projected are installed. Press the power switch 6 (shown in FIG. 2) of the projector 1 to turn on the power. Subsequently, the lamp switch 9 (shown in FIG. 2) is pressed to start supplying power to the light source unit of the projection unit 2. After a while, the projection light on the screen S becomes brighter. Here, depending on the positional relationship between the projection unit 2 of the projector 1 and the screen S, correction of the shape distortion of the projection screen may be necessary. In this embodiment, at this time, first, the CPU 100 uses the data of the newest relative angle θ1 detected and stored by the inclinometer 30 of the projection unit 2 to optically modulate the shape distortion correction of the projection screen in the vertical direction. This is executed for the optical system drive control unit 130. However, the precondition for correcting the shape distortion of the projection screen is that the screen S is installed vertically, and the shape distortion of the projection screen cannot be corrected for the angle at which the screen S is inclined. There is. Therefore, in this case, the shape distortion of the projection screen is manually corrected using the shape distortion correction switch 7 of the operation unit 5. Further, the correction of the shape distortion of the horizontal projection screen is performed manually. In this way, after correcting the shape distortion of the projection screen, the user inserts the recording medium D into the DVD playback unit 3 and starts watching a movie or the like. Here, the user may manually correct the shape distortion of the projection screen during the movie.

  For this reason, it is necessary to determine when the projector 1 has finished projecting. When the user finishes watching the movie, for example, when the lamp switch 9 is pressed, the power to the light source unit 11 is cut off, and thus the projection from the projection lens unit 2b ends. When the CPU 100 obtains a signal indicating that the lamp switch 9 has been pressed, the current relative angle θ1 and the current rotation as relative angle information detected by the inclinometer 30 and the rotation angle detector 80 when the lamp switch 9 is pressed. The relative angle data of the relative angle β1 is stored in the data storage unit 111 of the EEPROM 102 as the previous angle data 111a. In the stored relative angle data, the current relative angle θ1 becomes the previous relative angle θ2, and the current rotation relative angle β1 becomes the previous rotation relative angle β2. Based on the relative angle data of the current relative angle θ1 and the current rotation relative angle β1, the current correction amount δ1 of the signal executed by the shape distortion correction control unit 131 and the shape distortion manual correction control unit 132 is calculated. Is stored in the data storage unit 111 of the EEPROM 102 as the correction amount δ2 data. Waiting for the cooling fan of the optical system to stop, the user presses the power switch 6 to complete the projection. When the projector 1 is temporarily stored, the projection unit 2 is adjusted to a position suitable for storage with respect to the base unit 4.

Next, when the projector 1 is used again, the projection unit 2 is projected again onto the screen S. At this time, when the projection is to be performed at a position slightly deviated from the screen, or slightly different from the angle directed at the previous time. In some cases, a slight difference from the previously projected angle may occur. Here, the latest previous angle data 111a before the current time stored in the data storage unit 111 and the current latest relative angle (θ1, β1) stored in the current angle data buffer 103a of the RAM 103 detected this time. ) Find the difference from the data. Based on the assumption that the previous correction amount was completely corrected at the most recent relative angle before the previous current time, an amount that compensates for the angle difference between the previous time and this time is added to the previous correction amount δ2 data. Thus, the correction amount of the shape distortion of the projection screen is determined, and the light modulation optical system drive control unit 130 is caused to execute the correction.
Hereinafter, effects of the embodiment will be described.

  (1) A projector 1 provided with a projection unit 2 provided so as to be movable with respect to a base unit 4, and is a virtual that extends in the vertical direction through the base unit 4, which was used by the user last time. The previous relative angle θ <b> 2 of the projection unit 2 with respect to the base unit 4 in the plane orthogonal to the axis is stored in the data storage unit 111. This time, the newest current relative angle θ1 in the plane perpendicular to the virtual axis extending in the vertical direction through the platform 4 in the state of use by the user is detected, and the newest relative angle θ2 and the current relative angle before the previous current time are detected. By correcting the shape distortion of the screen projected by the CPU 100 based on the difference from θ1, it is possible to provide a projector that can easily correct the shape distortion, and without placing a burden on installation and setting on the user. Shape distortion can be corrected in a short period of time and without being disturbed by a test pattern.

  (2) A projector 1 provided with a projection unit 2 provided so as to be movable with respect to a base unit 4, a virtual that extends in the vertical direction through the base unit 4, which was used by the user last time. The latest rotation relative angle β2 of the projection unit 2 with respect to the base unit 4 in the plane including the axis before the previous present is stored in the data storage unit 111. This time, the newest current relative rotation angle β1 in the plane including the virtual axis extending in the vertical direction through the platform used by the user is detected, and the difference between the previous relative rotation angle β2 and the current relative rotation angle β1 is detected. Based on the above, by correcting the shape distortion of the screen projected by the CPU 100, it is possible to provide the projector 1 with simple shape distortion correction.

  (3) A projector 1 provided with a projection unit 2 provided so as to be movable with respect to the base unit 4, and is a virtual that extends in the vertical direction through the base unit 4, which was used by the user last time. The previous relative angle θ2 and rotational relative angle β2 of the projection unit 2 with respect to the base unit 4 in the plane orthogonal to the axis and in the plane including the virtual axis are stored in the data storage unit 111. This time, the most recent current relative angle θ1 and current rotation relative angle β1 in the plane orthogonal to the virtual axis extending in the vertical direction through the platform 4 in the state used by the user and in the plane including the virtual axis are detected, By correcting the shape distortion of the screen on which the CPU 100 is projected based on the difference between the newest relative angle (θ2, β2) before the previous current and the current newest relative angle (θ1, β1), It is possible to provide the projector 1 with simple shape distortion correction.

  (4) When it is detected that the projector 1 has been moved by the gyro sensor 33 as the movement detection unit, the previous relative angle (θ2, β2) data and the previous correction amount (δ2) data are stored. Since the shape distortion correction based on this is not performed, it is possible to provide a user-friendly projector that does not perform an incorrect correction. The embodiment is not limited to the above, and can be modified as follows.

  (Modification 1) When the gyro sensor 33 detects the movement, the direction and distance of the movement of the projector 1 may be guided by display or the like so that the projector 1 is placed at substantially the same position as the previous time. Thereby, the user can simplify the installation close to the previous installation state.

  (Modification 2) When the projector 1 has moved from the previous position, the user may be notified by display or voice. Thus, the user can easily know that the projector 1 is moving.

  (Modification 3) When the shape distortion is manually corrected halfway after the power is turned on, the relative angle data after the manual correction may be updated as the previous relative angle data. In this case, after that, when the projection unit 2 is moved with respect to the base unit 4, the shape distortion can be more reliably eliminated.

  (Modification 4) Instead of the encoder unit 85 of the rotation angle detection unit 80, a laser light emitter and a laser light receiver may be used, and a reflector may be provided on the upper surface of the slide body 86. Thereby, the frictional resistance between the slide body 86 and the friction wheel 87 is eliminated, and the rotation angle can be detected more reliably.

  (Modification 5) Although the connecting part 50 and the DVD reproducing part 3 are separated, they may be integrated. Thereby, a flatter projector 1 can be provided.

  (Modification 6) Although the recording medium D is a DVD, it may be a videotape, CD, MD and MO. Further, the base unit 4 may not include a playback unit such as a DVD. Thus, the projector 1 including a device that reproduces a wide range of images or sounds can be provided, and the user can easily correct the distortion of the projection screen.

  (Modification 7) Although the projection type optical device of the projection unit is a projection display device using a three-plate transmission type liquid crystal light valve, the projection type display device using a reflection type liquid crystal panel, the CRT type projection display A projection display device using a device or a micromirror device (DMD) may be used. Accordingly, it is possible to provide the projector 1 in which the user can easily correct the shape distortion generated by projecting the image.

  (Modification 8) The display unit provided in the projection screen or the projector 1 may have a function of displaying whether or not the correction of the shape distortion being performed is based on the stored relative angle information. . As a result, the user can easily know whether or not the projector 1 has been corrected with the previously used relative angle information without moving.

  (Modification 9) The process of saving each relative angle information in the data storage unit 111 of the EEPROM 102 may be sequentially performed, or when the relative angle is not changed and the manual correction of the shape distortion is not performed for a predetermined time. You may make it carry out. Thereby, the newest relative angle information before the present can be securely stored.

  (Modification 10) As a shape distortion correction method, when correcting the shape distortion by compressing and reducing the number of pixels or lines normally projected by the liquid crystal light valve R in advance, the shape distortion correction method in the vertical direction is used. The necessary amount of pixel compression may be canceled. Further, as a horizontal shape distortion correction method, a required amount of line compression may be canceled. According to this, it is possible to prevent the resolution of the projected screen from being lowered by correcting the shape distortion.

The perspective view which shows a projector. The perspective view of an operation part. The side view when a projection part inclines toward a screen with respect to a base part in a X-axis-Y-axis surface. The top view in case a projection part only rotates around the Z-axis with respect to a base part. The perspective view at the time of projecting a projection part to diagonally upward and rotating and projecting on a screen. Explanatory drawing of the correction method of the shape distortion at the time of turning a projection part diagonally upwards and rotating. Sectional drawing when a projection part is tilted with respect to a base part. FIG. 3 is an electrical configuration diagram of the projector 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector 2 ... Projection part 2a ... Convex spherical body 2b ... Projection lens part 3 ... DVD reproducing part 4 as a base part ... Base part 4a ... Concave spherical body 5 ... Operation part 6 as a correction part ... Power switch 7 ... Shape distortion correction switch 9 as a correction part ... Lamp switch 10 ... Lower case 10a ... Supporting point guide surface 10b ... Contact part 11 ... Light source part 12 ... Dichroic mirror 13 ... Cross dichroic prism 30 ... Inclinometer 33 as detection part ... Gyro sensor 50 as a movement detection unit ... Connection unit 50a as a base unit ... Hole 52 ... Guide surface 60 ... Liquid 61 ... Electrode 62 ... Electrode 80 ... Rotation angle detection unit 81 as detection unit ... Shaft 81a ... Support point 82 ... Weight 83 ... Magnet 84 ... Magnet 85 ... Encoder unit 86 ... Slide body 87 ... Friction wheel 88 ... Slit disc 100 ... CPU as control unit
101: ROM as a control unit
102... EEPROM as control unit and data storage unit
103 ... RAM as control unit and data storage unit
103a: Angle data buffer 103b as a data storage unit ... Correction amount data buffer 103c as a data storage unit ... Previous angle data buffer 103d as a data storage unit ... Previous correction amount data buffer 103e as a data storage unit ... Data storage Angle difference buffer 104 as a unit ... User I / F
105 ... Inclinometer control unit 106 as a detection unit ... Gyro sensor control unit 107 as a movement detection unit ... Encoder control unit 110 as a detection unit ... Data bus 111 ... Data storage unit 111a ... Previous angle data as a data storage unit 111b: Previous correction amount data 130 as a data storage unit ... Light modulation optical system drive control unit 131 as a correction unit ... Shape distortion correction control unit 132 as a correction unit ... Shape distortion manual correction control unit D as a correction unit ... Recording medium H ... Horizontal line K ... Optical axis Ka as reference direction of projection unit ... Reference direction P of virtual axis ... Virtual rotation axis R ... Liquid crystal light valve S as correction unit ... Screen S1 ... Outline β1 ... Newest relative angle information Current rotation relative angle β2 as the previous latest rotation relative angle δ1 as the latest relative angle information before the present, as the latest correction amount information The last of the relative angle of as the current correction amount δ2 ... most new relative angle information of the current relative angle θ2 ... current and earlier as the previous correction amount θ1 ... most new relative angle information of the current as the previous most new correction amount information

Claims (4)

A projector comprising a base part and a projection part provided movably with respect to the base part,
A correction unit that corrects shape distortion that may occur in a light projection area on the projection surface by the projection light from the projection unit;
A detection unit for detecting a relative angle between the platform and the projection unit defined by the movement in a plane orthogonal to a virtual axis extending in the vertical direction through the platform;
A data storage unit that stores the latest relative angle information before and after the current detected by the detection unit and the latest correction amount information before and based on the relative angle information;
Based on the difference between the relative angle information and the correction amount information stored in the data storage unit and the newest correction amount information based on the newest relative angle information and the newest relative angle information detected by the detection unit. And a control unit that corrects the shape distortion by supplying a correction command signal to the correction unit. A projector comprising a base part and a projection part provided movably with respect to the base part,
A correction unit that corrects shape distortion that may occur in a light projection area on the projection surface by the projection light from the projection unit;
A detection unit for detecting a relative angle between the platform and the projection unit defined by the movement in a plane including a virtual axis extending in the vertical direction through the platform;
A data storage unit that stores the latest relative angle information before and after the current detected by the detection unit and the latest correction amount information before and based on the relative angle information;
Based on the difference between the relative angle information and the correction amount information stored in the data storage unit and the newest correction amount information based on the newest relative angle information and the newest relative angle information detected by the detection unit. A correction command signal to the correction unit to correct the shape distortion,
The platform has a movement detection unit, and when the movement detection unit detects the movement of the platform, no correction is performed based on the latest correction amount information before and presently stored in the data storage unit. A projector characterized by that. A projector comprising a base part and a projection part provided movably with respect to the base part,
A correction unit that corrects shape distortion that may occur in a light projection area on the projection surface by the projection light from the projection unit;
Between the base part and the projection part defined by the movement in a plane orthogonal to a virtual axis extending in the vertical direction through the base part and an angle formed by a reference direction of the virtual axis and a reference direction of the projection part A detection unit for detecting the relative angle of
A data storage unit that stores the latest relative angle information before and after the current detected by the detection unit and the latest correction amount information before and based on the relative angle information;
Based on the difference between the relative angle information and the correction amount information stored in the data storage unit and the newest correction amount information based on the newest relative angle information and the newest relative angle information detected by the detection unit. And a control unit that corrects the shape distortion by supplying a correction command signal to the correction unit. The projector according to claim 1 or 3,
The platform has a movement detection unit, and when the movement detection unit detects the movement of the platform, no correction is performed based on the latest correction amount information before and presently stored in the data storage unit. A projector characterized by that.

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