JP2008083414A - Projection device - Google Patents

Abstract

A projection device that automatically changes the projection direction of projection light even when the projection device is moved.
A projection device (10) mounted on an installation surface (12) and capable of projecting an image (18) onto a screen (16) on a plane intersecting the installation surface (12), wherein the projection device (10) is moved relative to the installation surface (12). Based on the measured movement amount, the movement means 81 configured to be possible, the projection state changing means 40 for changing the projection state of the video 18, the movement amount measurement means for measuring the movement amount when moved by the movement means 81, and the like. Projection state calculation means for calculating a change amount of the projection state from the projection state before the movement, and configured to change the projection state of the video based on the calculated change amount of the projection state.
[Selection] Figure 1

Description

  The present invention relates to a projection apparatus, and more particularly to a projection apparatus that is placed on a desk top surface and forms an image with light projected onto a projection plane that intersects the desk top surface.

  Conventionally, when a presentation is given to a plurality of subjects, a projection device projects a document stored in a computer device onto a screen surface, and a presentation is performed using a formed image. ing.

  In performing this presentation, using a projection device that projects video onto the screen surface has the advantage that the size and projection position of the image can be set relatively freely according to the size of the venue and the number of participants.

  Therefore, an invention relating to a projector position adjustment device that is capable of adjusting the height and inclination of a projected image and that is compact and has excellent portability is known (for example, see Patent Document 1).

  The position adjustment device described in Patent Document 1 supports a lower part of a projector, rotates a projector that rotates substantially horizontally, supports the rotary table at three locations with respect to an installation surface, and It is characterized by comprising three sets of leg portions that can move up and down in the vertical direction.

  In addition, a projector invention that automatically adjusts the left and right projection directions so that the projection optical axis of the projection device is always perpendicular to the horizontal line on the screen is known (see, for example, Patent Document 2). ).

In the projector described in Patent Document 2, a horizontal linear test pattern is projected from the projection device through the projection lens onto the projection surface, and the test pattern on the projection surface is separated vertically above the projection lens. The image analysis tilt angle calculation unit of the tilt angle measuring apparatus captures the difference pixel number information about the difference pixel number in the horizontal direction from the imaging screen of the image sensor, and the projection optical axis and the projection surface of the projection apparatus And the horizontal projection direction automatic adjustment device rotates the right wheel and the left wheel of the front leg based on the obtained horizontal tilt angle, thereby changing the projection optical axis of the projection device to the screen. It is automatically adjusted so that it is always perpendicular to the upper horizontal line.
JP 2005-195871 A JP 2005-201954 A

  However, when a presentation device is used to perform a presentation and the position of the projection device is moved according to the size of the venue and the number of participants, the distance between the projection device and the screen after the movement and the projection angle with respect to the screen are set. Accordingly, the projected position, the in-focus position, the size of the image, and the tilt angle of the image change.

  In addition, when the projection device changes the projection angle of the image when projecting the image on the screen, the projection position of the projected image, the in-focus position, the size of the image, according to the changed projection angle, The tilt angle of the image changes.

  In such a case, the user has to adjust the projection direction, the focus position, the angle of view, and the tilt of the image again. Furthermore, when the image size or the image position is changed by this adjustment, it is necessary to perform fine adjustment such as moving the projection device again or changing the projection angle. Such adjustment of the projection direction, in-focus position, angle of view, and fine adjustment of the tilt of the image are unexpectedly difficult, and there is a problem that adjustment work takes time.

  In the position adjustment device described in Patent Document 1, by including a rotary base that rotates the projector substantially horizontally, and three sets of legs that support the rotary base so that it can be moved up and down with respect to the installation surface, Although it is possible to adjust the height and tilt of the image, if the position of the projection device is moved or the projection angle of the image is changed, the user again adjusts the projection direction, focus position, angle of view, Or it was necessary to adjust the inclination of the image.

  Further, in the projector described in Patent Document 2, the projected test pattern is imaged to calculate a horizontal tilt angle, and using this horizontal tilt angle, the projection optical axis is always perpendicular to the horizontal line on the screen. It is automatically adjusted so that However, in the projector described in Patent Document 2, since the projection optical axis is always automatically adjusted so as to be perpendicular to the horizontal line on the screen, the projector is arranged when projecting an image using the projector. There is a problem that this causes a restriction. Further, when the position of the projector is moved or the projection angle of the video is changed, the user needs to adjust the projection direction, the focus position, or the angle of view again.

  The present invention has been made to solve the above-described problem, and measures the amount of movement when the projection device is moved to calculate the projection state such as the optimum projection direction at the position, and the optimum projection state. Based on the calculated projection state change amount, the projection state of the image, that is, the projection direction of the image, the amount of light, the in-focus position, the angle of view, or the tilt angle of the image is optimized. It is an object of the present invention to provide a projection apparatus that can be changed rationally and easily to a simple state.

  In order to solve the above problem, the projection device according to claim 1, a moving unit configured to move the projection device relative to the installation surface, a projection state changing unit that changes a projection state of the video, A movement amount measuring means for measuring a movement amount when moved by the moving means; and a projection state calculating means for calculating a change amount of the projection state from the projection state before the movement based on the measured movement amount, The projection state changing unit changes the projection state of the video based on the change amount of the projection state calculated by the calculation unit.

    According to a second aspect of the present invention, the projection state calculation unit according to the first aspect includes a projection state storage unit that stores a projection state before the movement, and the movement measured with the stored projection state before the movement. A change amount of the projection state is calculated based on the amount.

  According to a third aspect of the present invention, the moving means of the projection device according to the first or second aspect has a rotating body that contacts the installation surface, and the moving amount measuring means is the rotating body. The encoder is characterized in that it measures the amount of rotation.

  According to a fourth aspect of the present invention, the movement amount measuring means of the projection apparatus according to the first or second aspect is made relatively to the installation surface by bringing a part of a sphere into contact with the installation surface. A spherical rotating body that can rotate in response to various movements, a rotating body receiving portion that rotatably holds the spherical rotating body, and an encoder that measures the amount of rotation of the spherical rotating body. To do.

  According to a fifth aspect of the present invention, the movement amount measuring means of the projection apparatus according to the fourth aspect includes an encoder that measures the amount of rotation of the spherical rotating body in two orthogonal axes.

  According to a sixth aspect of the invention, an optical encoder that optically measures the movement amount is used for the movement amount measuring means of the projection apparatus according to any one of the first to fifth aspects. Features.

  According to a seventh aspect of the present invention, the projection state changing means of the projection apparatus according to any one of the first to sixth aspects is adapted to move the projected image in the vertical direction with respect to the installation surface. Direction moving means, left-right direction moving means for moving the projected image in the left-right direction, or inclination angle changing means for changing the inclination angle of the projected image are provided.

  According to an eighth aspect of the invention, a spherical protrusion and the spherical protrusion are rotated between the projecting means for projecting an image of the projection apparatus according to any one of the first to sixth aspects and the moving means. And a spherical groove that is freely held, wherein the image can be moved vertically and horizontally with respect to the installation surface, and the tilt angle of the image can be changed.

  The invention described in claim 9 is characterized in that the projection device is provided with a light amount adjusting means for adjusting the light amount of the image in accordance with the projection direction of the image.

  According to a tenth aspect of the present invention, the projection apparatus includes an in-focus position adjusting unit that adjusts an in-focus position of an image according to a movement amount of the projection apparatus or a projection direction of the image.

  According to an eleventh aspect of the present invention, the projection apparatus includes an angle-of-view adjusting unit that adjusts an angle of view of an image in accordance with a movement amount of the projection apparatus or an image projection direction.

  According to a twelfth aspect of the present invention, the projection apparatus includes a reference setting unit that sets a reference value of a position with respect to a screen on which an image is projected, and the projection state calculation unit includes the reference value and the movement amount. Based on this, the projection direction of the video is changed.

  The invention according to claim 13 changes the projection state according to any one of claims 1 to 12 when half the angle of view of the image projected by the projection apparatus exceeds 50 degrees. It is characterized by.

  According to a fourteenth aspect of the present invention, in the projection apparatus according to the first or second aspect, the moving means is constituted by a low friction contact surface.

  According to the first aspect of the present invention, the amount of movement when the projection apparatus is movable with respect to the installation surface is measured to calculate the amount of change in the projection state of the video, and the projection position, Since the projection state of the image including zoom, focus, angle of view, etc. is changed, even when the user moves the projection device manually or remotely, the projection device displays the image in the direction in which the screen exists. It is possible to automatically adjust the projection. Therefore, even when the projection apparatus is moved by the user, it is possible to reduce the trouble of the user adjusting the projection state of the video after the movement.

  In addition, since the projection apparatus according to the second aspect includes the projection state storage unit that stores the projection state before the movement in the projection state calculation unit according to the first aspect, a good projection state is first manually set. After that, every time it is moved, the projection amount can be changed by calculating the change amount according to the movement distance. Accordingly, it becomes easy to calculate the change amount of the projection state.

  According to a third aspect of the present invention, there is provided a projection device according to the first or second aspect, wherein the moving amount measuring means of the projection device according to the first or second aspect includes an encoder that measures a rotating body that contacts the installation surface and a rotation amount of the rotating body. Therefore, it is possible to easily and accurately measure the movement amount when the projection apparatus is moved with respect to the installation surface.

  Further, since the rotating body serves both as the movement amount measuring means and the moving means, it is rational and can be expected to save space and cost. Then, the projection state of the video can be calculated based on the movement amount measured by the encoder, and the projection state of the video can be automatically changed.

  According to a fourth aspect of the present invention, the movement amount measuring means of the projection apparatus according to the first or second aspect measures a spherical rotating body in contact with the installation surface and a rotation amount of the spherical rotating body. Since the encoder is provided, the amount of movement when the projection apparatus is freely moved within the plane of the installation surface can be measured easily and accurately. In addition, since the spherical rotating body serves both as the movement amount measuring means and the moving means, it is rational and can be expected to save space and cost. Then, the projection state of the video can be calculated based on the movement amount measured by the encoder, and the projection state of the video can be automatically changed.

  In the projection apparatus according to claim 5, since the movement amount measuring means of the projection apparatus according to claim 4 is provided with an encoder for measuring the amount of rotation of the spherical rotating body in the two orthogonal axes, the plane of the installation surface is provided. It is easy to detect the amount of movement of the projection device in the two-dimensional direction.

  Moreover, since the projection apparatus of Claim 6 used the optical encoder for the moving amount measurement means of the projection apparatus of any one of Claims 1-5, it maintains a high resolution stably. be able to. In addition, when the moving amount measuring means optically measures the reflected light from the installation surface, a rotating body or the like is not required, and the moving means need only be a friction-contacting surface, which reduces costs and simplifies the structure. Effective.

  The projection device according to claim 7 causes the projection state changing means of the projection device according to any one of claims 1 to 6 to move the projected image vertically with respect to the installation surface. Since it includes a vertical movement means, a horizontal movement means for moving the projected video in the horizontal direction, or a tilt angle changing means for changing the tilt angle of the projected video, it can be adapted to the movement of the projection device. The elevation angle of the image, the azimuth angle of the image, or the tilt of the image can be automatically adjusted. Therefore, even when the projection apparatus is freely moved, it is possible to reduce time and effort for the user to readjust the elevation angle of the image or the azimuth angle of the image in the direction in which the screen exists. Further, even when the projection apparatus is moved, it is possible to reduce the trouble of readjusting the tilt of the image.

  The projection device according to claim 8 holds the spherical protrusion and the spherical protrusion rotatably between the projection means and the moving means of the projection apparatus according to any one of claims 1 to 6. A three-axis polar coordinate system with a simple structure since the image can be moved vertically and horizontally with respect to the installation surface and the tilt angle of the image can be changed. Can be rotated.

  According to a ninth aspect of the present invention, in the case where the angular difference between the projection direction of the image and the normal line of the screen changes due to the user moving the projection device manually or remotely, Since it is configured to automatically adjust the light amount of the image according to the difference, even if the angle of the projection direction with respect to the screen changes due to the movement of the projection device, the problem that the brightness of the image changes is reduced. be able to. Further, it is possible to reduce the work of adjusting the brightness of the image when the angle of the projection direction with respect to the screen is changed.

  Further, when the distance between the projection unit of the projection apparatus and the screen changes due to the user moving the projection apparatus manually or remotely, the light amount of the image is automatically adjusted according to the distance. With this configuration, even when the projection apparatus is moved with respect to the screen, the change in the brightness of the image can be reduced. Further, it is possible to reduce the work of adjusting the brightness of the image when the projection unit of the projection apparatus is moved with respect to the screen.

  The projection apparatus according to claim 10, wherein when the user moves the projection apparatus manually or remotely, the angle difference between the projection direction of the image and the normal line of the screen changes. Since the focus position of the image is automatically adjusted according to the difference, even if the angle difference in the projection direction with respect to the screen changes, the shift of the focus position can be reduced. Moreover, the adjustment work of the focus position when the angle of the projection direction with respect to the screen changes can be reduced.

  Further, when the distance between the projection unit of the projection apparatus and the screen changes due to the user moving the projection apparatus manually or remotely, the focus position of the image is automatically set according to the distance. Since the adjustment is made, the shift of the in-focus position can be reduced even when the projection unit of the projection apparatus is moved with respect to the screen. Further, it is possible to reduce the work of adjusting the in-focus position when the projection unit of the projection apparatus is moved with respect to the screen.

  The projection apparatus according to claim 11, wherein when the user moves the projection apparatus manually or remotely, the angle difference between the projection direction of the image and the normal line of the screen changes. Since the angle of view of the image is adjusted according to the difference, even when the angle of the projection direction with respect to the screen changes, the variation in the size of the image can be reduced. Further, it is possible to reduce the adjustment work of the image size when the angle of the projection direction with respect to the screen changes.

  In addition, when the distance between the projection unit of the projection device and the screen changes due to the user moving the projection device manually or remotely, the angle of view of the image is automatically adjusted according to that distance. Thus, even when the projection unit of the projection apparatus is moved with respect to the screen, fluctuations in the size of the image can be reduced. Further, it is possible to reduce the adjustment work of the image size when the projection unit of the projection apparatus is moved with respect to the screen.

  According to a twelfth aspect of the present invention, the projection apparatus includes a reference setting unit that sets a reference value of a position with respect to a screen on which an image is projected, and changes the projection direction of the image based on the reference value and the movement amount. Since it comprised, it becomes possible to change the projection direction of an image | video using an incremental encoder as a moving amount measurement means.

  In the projection device according to the thirteenth aspect, the projection state is changed when half of the angle of view of the projected image exceeds 50 degrees. Therefore, the ratio of the upper and lower sides of the projected trapezoidal image The projection state can be changed only when the rate of change with respect to the rotation angle increases rapidly.

In the invention according to claim 14, since the moving means is constituted by a low friction contact surface,
It is possible to provide an inexpensive projection apparatus with a simple configuration.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view of a projection apparatus according to an embodiment of the present invention.

  The projection device 10 is a device that is placed on an installation surface 12 such as a table, projects projection light 14, and forms an image 18 on a screen 16.

  The projection apparatus 10 includes a projection unit 11 for projecting the projection light 14, a support body 60 including a movement unit 81 configured to move the projection unit 11 with respect to the installation surface 12, and the support unit 60 and the projection unit. 11 and a projection state changing unit 40 that changes the projection state such as the projection direction of the video 18.

  Inside the projection unit 11, a light emitting unit 20 that emits projection light, a diaphragm 22 that adjusts the amount of light emitted by the light emitting unit 20 (one form of light amount adjusting unit), and illumination light emitted by the light emitting unit 20 The illumination optical system 24 for adjusting the light to parallel light, the light modulation means 26 for forming an image for each color using the illumination light emitted from the light emitting means 20, and the light modulated by the light modulation means 26 projected onto the screen 16 And a projection lens 28. The light modulation means 26 is an apparatus that forms an image to be projected using a video signal output from a computer apparatus or the like, and can be constituted by, for example, a liquid crystal display element.

  In the example shown in FIG. 1, as a configuration example of the projection lens 28, a variator lens group 30 (of an angle of view adjusting unit) that changes the size of the image 18 by adjusting the angle of view of the projection light 14 projected onto the screen 16. One embodiment), a compensator lens group 32 that corrects the shift of the focus position when the angle of view is adjusted, and a focusing lens group 34 that adjusts the focus position of the image 18 projected on the screen 16 (focus position adjustment). Means). The angle of view can also be adjusted by changing the size of the image formed by the light modulation means 26.

  The projection state changing unit 40 of the projection apparatus 10 moves the projected image 18 in the vertical direction and the left-right direction with respect to the installation surface 12 and can perform an operation of tilting the projected image 18. A bearing 41 is provided.

  The spherical bearing 41 is provided between the projecting unit 11 that projects the image 18 and the moving unit 81. The spherical bearing 41 includes a spherical protrusion 42 and a spherical groove 44 that rotatably holds the spherical protrusion 42, and allows the image 18 to move vertically and horizontally with respect to the installation surface 12. The inclination angle of 18 can be changed freely.

  Further, the projection state changing means 40 includes a motor 48P (vertical direction moving means) for moving the image 18 in the vertical direction with respect to the installation surface 12 by driving the spherical protrusion 42. The projection state changing means 40 includes an encoder 50P that measures the rotation angle of the motor 48P, and a friction roller that transmits the rotation amount of the motor 48P as the rotation amount of the spherical protrusion 42 by bringing a part of the encoder 50P into contact with the spherical protrusion 42. 46P.

  Further, the projection state changing means 40 includes a motor 48 </ b> W (left / right direction moving means) for moving the image 18 in the left / right direction with respect to the installation surface 12 by driving the spherical protrusion 42. The projection state changing means 40 includes an encoder 50W that measures the rotation angle of the motor 48W, and a friction roller that transmits the rotation amount of the motor 48W as the rotation amount of the spherical protrusion 42 by partially contacting the spherical protrusion 42. 46W.

  Further, the projection state changing means 40 is provided with a motor 48R (inclination angle changing means) for changing the inclination angle of the image 18 by driving the spherical protrusion 42. The projection state changing means 40 includes an encoder 50R that measures the rotation angle of the motor 48R, and a friction roller that transmits a rotation amount of the motor 48R as a rotation amount of the spherical protrusion 42 by partially contacting the spherical protrusion 42. 46R.

  By configuring the projection state changing means 40 in this way, the projected image 18 can be automatically moved in the vertical direction and the left-right direction with respect to the installation surface 12, and the projected image 18 is tilted. The operation can be performed automatically.

  As shown in FIG. 1, the moving means 81 of the projection apparatus 10 includes a plurality of sets of spherical bearings 61 that configure the projection apparatus 10 to be movable with respect to the installation surface 12. The spherical bearing 61 is partly in contact with the installation surface 12, and rotates a spherical rotating body 62 (one form of the rotating body) that rotates with the movement of the projection apparatus 10, and the spherical rotating body 62 can rotate freely. And a spherical groove 64 to be held.

  In the embodiment shown in FIG. 1, the moving means 81 of the projection apparatus 10 can move the projection apparatus 10 in the biaxial direction with respect to the installation surface 12 by driving the spherical rotating body 62. . For this purpose, the moving means 81 is provided with a motor 48X and a motor 48Y.

  Further, as a moving means for moving the projection apparatus 10 in one axis direction (for example, the normal direction of the screen 16 shown in FIG. 1), an encoder 50Y (movement amount measuring means) for measuring the rotation angle of the motor 48Y, and a part thereof. A friction roller 46 </ b> Y that transmits the rotation amount of the motor 48 </ b> Y as the rotation amount of the spherical rotating body 62 by being brought into contact with the spherical rotating body 62 is provided.

  Further, an encoder 50X that measures the rotation angle of a motor 48X as a moving means 81 that moves the projection device 10 in another axial direction (for example, a direction parallel to the surface of the screen 16 shown in FIG. 1 and parallel to the installation surface 12). (Movement amount measuring means) and a friction roller 46X that transmits a rotation amount of the motor 48X as a rotation amount of the spherical rotating body 62 by bringing a part thereof into contact with the spherical rotating body 62.

  By configuring the moving means 81 in this way, the projected image 18 can be moved by remote operation in two axial directions parallel to the installation surface 12, and the projection device 10 can be moved relative to the installation surface 12. It is possible to measure the amount of movement in the orthogonal two-axis directions when moved.

  In addition, in embodiment shown in FIG. 1, although embodiment using the spherical rotary body 62 as the moving means 81 is shown, you may use rotary bodies, such as a wheel. When a rotating body is used as the moving means, an encoder that measures the amount of rotation of the rotating body can be used as the moving amount measuring means. Furthermore, an optical encoder can be used as the encoder. Further, instead of measuring the amount of movement using a rotating body and an encoder, for example, light is projected onto the installation surface 12 like an optical mouse, the reflected light is read, and the amount of change in the reflected light is determined. You may comprise so that the optical movement amount measurement means which measures a movement amount may be used. In addition, since it is difficult to move without using a rotating body, the part that contacts the installation surface is made a low friction contact surface and moves so as to slide on the installation surface 12 as in the case of the optical mouse. Also good.

  Further, the moving means 81 may be constituted by a spherical rotating body 62 having no driving means like a ball mouse. When the moving means 81 as described above does not have a driving means, it is difficult to position the projection apparatus 10 and fix it on the installation surface.

  Next, the configuration of the signal processing system of the projection apparatus 10 will be described with reference to FIG.

  FIG. 2 is a block diagram of the control device 110 in the projection device 10.

  As shown in FIG. 2, the control device 110 of the projection device 10 adjusts the light amount, forms a projection image, adjusts the angle of view of the projection light 14, or projects the projection light 11 to project the projection light 14. A projection driver 164 for adjusting the in-focus position of the image 18 is provided.

  The projection driver 164 has a function of supplying power for causing the light emitting means 20 to emit light, a function of outputting an instruction to adjust the light shielding amount of the light emitted by the light emitting means 20 to the aperture 22, and the light emitting means 20 emitting light. The function of outputting a drive signal for forming a projection image to the light modulation means 26 in order to form a projection image with respect to the illumination light, the adjustment of the angle of view of the projection light 14 and the shift of the in-focus position. A function of outputting an angle-of-view adjustment signal for correction to the drive units of the variator lens group 30 and the compensator lens group 32 and a focus position control signal for adjusting the focus position of the image 18 projected on the screen 16. And a function of outputting to the driving unit of the focusing lens group 34.

  The adjustment of the amount of light of the projection light 14 may be realized by the information processing unit 180 (one form of the light amount adjustment unit) adjusting the diaphragm 22, or the information processing unit 180 may adjust the light modulation unit 26 (of the light amount adjustment unit). It may be realized by adjusting the amount of light transmitted through one form), or may be realized by the information processing means 180 adjusting the amount of light emitted by the light emitting means 20 (one form of light amount adjusting means). .

  The projection driver 164 of the control device 110 receives a video signal such as an RGB signal from a computer device (not shown) connected to the projection device 10, adjusts the luminance or color, and then performs light modulation. A drive signal for driving the means 26 is generated and output to the light modulation means 26. Further, the projection driver 164 may be provided with a function of synthesizing operation function information, menu projection, or other projection information of the projection apparatus 10 and outputting the synthesized information to the light modulation unit 26.

  In addition, the control device 110 includes an input unit 170 configured by buttons, switches, and the like for inputting brightness adjustment, color adjustment, or setting information of the projection device 10 according to a user's operation. Is provided with an input I / F 171 for transmitting operation information such as a switch output to the information processing means 180 via the bus 199.

  The projection device 10 is provided with a driver 70 for supplying driving power to the motors 48 provided in the moving unit 81 and the projection state changing unit 40. And an I / O 166 for outputting a control signal for driving each motor. The I / O 166 outputs a control signal to each driver 70 based on an instruction from the information processing means 180. The information processing means 180 instructs the I / O 166 to output a control signal for driving the motors 48 to move the projection light 14 in the vertical direction, or to move the projection light 14 to the installation surface 12. On the other hand, it is possible to perform control for moving the image 18 in the left-right direction or changing the tilt angle of the video 18.

  Further, the information processing means 180 instructs the I / O 166 to output a control signal for driving each motor 48 provided in the moving means 81, so that the projection apparatus 10 is placed on the installation surface 12. It can be moved in the biaxial direction.

  In addition, the control device 110 includes a counter 169 that inputs and counts the angle signal of each motor 48 output from each encoder 50 and outputs information related to the rotation angle of the shaft of each motor 48. The information processing unit 180 acquires the rotation angle of the shaft of each motor 48 provided in the projection state changing unit 40, so that the projection angle in the vertical direction of the projection light 14 and the horizontal direction of the projection light 14 with respect to the installation surface 12 are obtained. It is possible to acquire the projection angle and the tilt angle of the video 18.

  Further, when the information processing means 180 (movement amount measuring means) acquires the rotation angle of the shaft of each motor 48 provided in the moving means 81, the movement when the projection apparatus 10 moves relative to the installation surface 12. The amount can be measured.

  Further, the information processing unit 180 of the control device 110 has a function of a projection state calculation unit that calculates a direction in which the video 18 should be projected based on the movement amount of the projection device 10 with respect to the installation surface 12 measured by the counter 169. The information processing unit 180 has a function of changing the projection direction of the video 18 by outputting information for controlling the projection state changing unit 40 to the I / O 166 based on the calculated projection direction.

  Further, the information processing unit 180 of the control device 110 is configured so that the diaphragm 22, the light modulation unit 26, or the light emitting unit 20 is based on the amount of movement of the projection device 10 relative to the installation surface 12 measured by the counter 169 or the projection direction of the image 18. Is provided to the projection driver 164 to adjust the light quantity of the projection light 14 (light quantity adjusting means).

  The information processing unit 180 of the control device 110 projects information for controlling the focusing lens group 34 based on the amount of movement of the projection device 10 relative to the installation surface 12 measured by the counter 169 or the projection direction of the image 18. A function (focus position adjusting means) that outputs to the driver 164 and adjusts the focus position of the video 18 is provided.

  Further, the information processing unit 180 of the control device 110 controls the variator lens group 30 and the compensator lens group 32 based on the amount of movement of the projection device 10 relative to the installation surface 12 measured by the counter 169 or the projection direction of the image 18. Information (output angle adjusting means) for adjusting the angle of view of the video 18 by outputting information for output to the projection driver 164.

  The information processing unit 180 of the control device 110 includes a function of a reference setting unit that sets a reference value of a position with respect to the screen 16 on which the video 18 is projected. The information processing unit 180 (projection state calculation unit) Based on the value and the amount of movement of the projection apparatus 10, the projection state changing means 40 is controlled to change the projection direction of the video 18.

  The control device 110 also includes a RAM 181 that is used as a work area when the information processing means 180 executes processing, a ROM 183 that records various information such as processing programs executed by the information processing means 180 and constants, and a time count that keeps time. Means 190.

  Information processing means 180 in control device 110 and peripheral circuits including projection driver 164, I / O 166, counter 169, input I / F 171, RAM 181, ROM 183, time measuring means 190, etc. are connected by bus 199, Based on a processing program executed by the processing unit 180, the information processing unit 180 can control each peripheral circuit. Note that the processing program executed by the information processing means 180 can be provided by a recording medium or communication. Also, each peripheral circuit can be configured by an ASIC or the like.

  Next, the operation of the control device 110 will be described. When a video signal such as an RGB signal is input from the computer device, the projection driver 164 outputs a drive signal for forming an image to the light modulation means 26 and instructs the light emission means 20 to emit light. Thereby, the projection light 14 of the image is formed, and the image 18 can be projected on the screen.

  The light amount of the projection light 14 is adjusted by, for example, the user operating the input unit 170 to input light amount adjustment information. The light quantity adjustment information input by the user is acquired by the information processing means 180 via the input I / F 171 and the bus 199. Based on the acquired light amount adjustment information, the information processing unit 180 outputs information for controlling the diaphragm 22, the light modulation unit 26, or the light emitting unit 20 to the projection driver 164 to adjust the light amount of the projection light 14. The brightness of the image 18 is adjusted.

  The in-focus position of the projection light 14 is adjusted by, for example, the user operating the input unit 170 to input the in-focus position adjustment information. The focus position adjustment information input by the user is acquired by the information processing means 180 via the input I / F 171 and the bus 199. Based on the acquired focus position adjustment information, the information processing unit 180 outputs information for controlling the focusing lens group 34 to the projection driver 164 to adjust the focus position of the video 18.

  The angle of view of the projection light 14 is adjusted by, for example, the user operating the input unit 170 to input angle of view adjustment information. The angle-of-view adjustment information input by the user is acquired by the information processing means 180 via the input I / F 171 and the bus 199. The information processing unit 180 outputs information for controlling the variator lens group 30 and the compensator lens group 32 to the projection driver 164 based on the acquired field angle adjustment information, and adjusts the field angle of the projection light 14.

  When adjusting the image quality such as contrast and color tone of the video 18, the user operates the input unit 170 to adjust the image quality. The operation information of the operation switch 124 by the user is acquired by the input I / F 171 and transmitted to the information processing means 180. Based on the acquired operation information, the information processing unit 180 outputs information for adjusting contrast, color tone, and the like to the projection driver 164 to adjust the image quality of the video 18.

  Next, an embodiment in which the projection direction of the projection light 14 is automatically adjusted when the projection apparatus 10 is moved will be described with reference to FIG.

  FIG. 3 automatically adjusts the projection direction, in-focus position, light quantity, or angle of view when the projection apparatus 10 that originally existed at the position Y0 from the screen 16 is moved away from the screen 16 to the position Y1. It is a figure which shows embodiment.

  First, an embodiment of automatic adjustment of the projection direction will be described. As shown in FIG. 3, when the projection apparatus 10 is initially present at the position Y0, a reference value (projection state before movement) with respect to the screen 16 is set at that position, and the projection of the RAM 181 or the like is performed. Processing to be stored in the state storage means is performed. The reference position may be set by measuring the distance Y0 to the screen using, for example, a triangulation type distance sensor, or the distance of FC0 from the positional relationship of the focusing lens group 34 set as a focus position by the user. And Y0 may be calculated using the angle GA0.

  Next, the information processing means 180 refers to the counter 169 and uses the A phase and B phase pulses output from the encoder 50P that measures the rotation angle of the motor 48P in the vertical direction of the projection state changing means 40 to project the projection means 11. The initial angle GA0 in the vertical direction (projection state before movement) is acquired and stored in the projection state storage means such as the RAM 181.

  Next, the case where the projection apparatus 10 is moved to the position Y1 by the user will be described. When the projection apparatus 10 is moved from the screen 16 to the position Y1 by manual or remote operation, the spherical rotating body 62 provided in the moving means 81 rotates.

  The amount of rotation of the spherical rotating body 62 is transmitted to the friction roller 46Y, the shaft of the motor 48Y rotates, the encoder 50Y measures the rotation angle of the motor 48Y, and, for example, pulses of A phase and B phase Is output to the counter 169. The counter 169 outputs information related to the rotation angle of the motor shaft of the motor 48Y to the information processing means 180 using the input pulse. The information processing means 180 calculates the moving direction and moving distance of the projection apparatus 10 from the acquired rotation angle of the motor shaft. Next, the information processing means 180 calculates a distance Y1 from the screen 16 of the projection apparatus 10 after the movement.

  Then, the information processing means 180 adds the initial angle GA0 to the distance ratio obtained by dividing Y0 by Y1, and calculates a newly set angle GA1 of the projection direction. When the projection direction to be newly set is calculated, the information processing unit 180 calculates the angular difference of (GA1) − (GA0) as the rotation angle, and the I / O 166 is moved in the vertical direction of the projection state changing unit 40. The driver 70 for driving the motor 48P is designated and the rotation angle is output.

  The driver 70 that has acquired the information on the rotation angle outputs electric power for driving the projection unit 11 downward by a predetermined rotation angle to the motor 48P while referring to the output of the encoder 50P. The motor 48P supplied with power rotates the friction roller 46P in a predetermined direction. The friction roller 46P is in contact with the spherical protrusion 42, and rotates the spherical protrusion 42 in a predetermined direction. Then, the projection means 11 configured integrally with the spherical protrusion 42 is rotated by an angle of (GA1)-(GA0), and the angle of GA1 is set. Then, since the projection direction of the projection light 14 is the direction of the point Q before the movement, even when the projection apparatus 10 is moved, the projection apparatus 10 projects an image in a predetermined direction where the screen 16 exists. Automatic adjustment is performed. Therefore, even when the projection device 10 is moved, it is possible to reduce the trouble of the user adjusting the projection direction of the video 18.

  Next, automatic adjustment of the focus position will be described. First, the initial reference distance FC0 (projection state before movement) between the projection apparatus 10 and the image 18 is obtained from the positional relationship of the focusing lens group 34 set as the in-focus position by the user, and the projection state storage means such as the RAM 181 or the like. Remember it. When the projection apparatus 10 is moved from the screen 16 to the position Y1 by manual or remote operation, the information processing means 180 acquires the rotation angle of the motor shaft of the motor 48Y and moves the projection apparatus 10 in the moving direction. And the moving distance (ΔY in the example shown in FIG. 3) is calculated. Next, the information processing means 180 calculates a distance Y1 and an angle GA1 from the screen 16 of the projection apparatus 10 after the movement, and calculates a new reference distance FC1. Then, the information processing unit 180 outputs information on the focus position to the projection driver 164 so that the focus position of the video 18 becomes the reference distance FC1. Then, the projection driver 164 outputs a focusing position control signal for driving the focusing lens group 34 to the driving unit of the focusing lens group 34 based on the information regarding the focusing position instructed from the information processing unit 180. The in-focus position is set to the reference distance FC1.

  As described above, even when the distance between the projection unit 11 of the projection apparatus 10 and the screen 16 changes due to the movement of the projection apparatus 10, the in-focus position of the image 18 is automatically set according to the change in the distance. Therefore, even when the projection unit 11 of the projection apparatus 10 is moved with respect to the screen 16, the shift of the in-focus position can be reduced. Therefore, it is possible to reduce the focus position adjustment work by the user when the projection unit 11 of the projection apparatus 10 is moved with respect to the screen 16.

  Next, automatic adjustment of the light amount of the projection light 14 will be described. When the automatic adjustment of the light amount of the projection light 14 is executed, the reference distance FC0 and the reference distance FC1 calculated when the focus position adjustment is executed are used. Since the brightness of the image 18 becomes dark in inverse proportion to the square of the reference distance, the information processing unit 180 has a value obtained by dividing the reference distance FC1 after movement by the reference distance FC0 to the light amount at the reference distance FC0 before movement. A process of increasing the amount of light in proportion to a value obtained by integrating the squares is performed. When automatically adjusting the brightness of the video 18, the information processing unit 180 outputs information regarding the amount of light after movement to the projection driver 164. Then, the projection driver 164 outputs information for controlling the diaphragm 22, the light modulation unit 26, or the light emitting unit 20 to the projection driver 164 based on the information on the light amount instructed from the information processing unit 180, and the projection light. The light quantity of 14 is adjusted, and the brightness of the image 18 is adjusted.

  As described above, even when the distance between the projection unit 11 of the projection apparatus 10 and the screen 16 changes due to the movement of the projection apparatus 10, the brightness of the video 18 is automatically adjusted according to the change in the distance. Since it is configured to adjust, even when the projection unit 11 of the projection apparatus 10 is moved with respect to the screen 16, it is possible to reduce a problem that the brightness of the video 18 changes. Therefore, it is possible to reduce the brightness adjustment work by the user who moved the projection unit 11 of the projection apparatus 10 with respect to the screen 16.

  Next, automatic adjustment of the angle of view of the projection light 14 will be described. When the automatic adjustment of the angle of view of the projection light 14 is executed, the reference distance FC0 and the reference distance FC1 calculated when the focus position adjustment is executed are used. Since the length of one side of the video 18 increases in proportion to the reference distance, the information processing means 180 divides the reference distance FC0 before movement by the reference distance FC1 to the angle of view Z0 at the reference distance FC0 before movement. A process of reducing the angle of view in proportion to the value obtained by integrating the values is performed. When performing automatic adjustment of the angle of view, the information processing unit 180 outputs information about the angle of view after movement to the projection driver 164. Then, the projection driver 164 outputs information for controlling the variator lens group 30 and the compensator lens group 32 to the projection driver 164 based on the information regarding the angle of view instructed from the information processing unit 180, and Adjust the angle of view.

  Thus, even when the distance between the projection unit 11 of the projection apparatus 10 and the screen 16 changes due to the movement of the projection apparatus 10, the size of the image 18 is automatically adjusted according to the change in the distance. Since it is configured to adjust, even when the projection unit 11 of the projection apparatus 10 is moved with respect to the screen 16, it is possible to reduce a problem that the size of the image 18 changes. Therefore, the work of adjusting the angle of view by the user when the projection unit 11 of the projection apparatus 10 is moved with respect to the screen 16 can be reduced.

  Next, an embodiment in which the projection direction of the projection light 14 is automatically adjusted when the projection apparatus 10 is moved will be described with reference to FIG.

  FIG. 4 shows the projection direction, in-focus position, light quantity, or angle of view when the projection apparatus 10 that originally existed at the position P0 (X0, Y0) is moved to the position P1 (X1, Y1). It is a figure which shows embodiment which adjusts automatically.

  First, an embodiment of automatic adjustment of the projection direction will be described. As shown in FIG. 4, when the projection apparatus 10 is initially present at the position P0, processing for setting a reference value of the position with respect to the screen 16 is performed at that position. The reference position may be set by measuring the distance to the screen (for example, Y0) using, for example, a triangulation type distance sensor, or from the positional relationship of the focusing lens group 34 set as the in-focus position by the user. The reference distance FC0 may be obtained and the coordinate value of P0 (X0, Y0) may be calculated.

  Next, the case where the projection apparatus 10 is moved to the position P1 by the user will be described. When the projection apparatus 10 is moved to the position P1 by manual or remote operation, the spherical rotating body 62 provided in the moving means 81 rotates as shown in FIG.

  The rotation amount of the spherical rotating body 62 is transmitted to the friction roller 46X or the friction roller 46Y, the shaft of the motor 48X or the motor 48Y rotates, and the encoder 50X or the encoder 50Y rotates the shaft of the motor 48X or the motor 48Y. The moving angle is measured, and the A-phase and B-phase pulses of each axis are output to the counter 169. The counter 169 outputs information on the rotation angle of the motor shaft of the motor 48X or the motor 48Y to the information processing means 180 using the input pulse. The information processing means 180 calculates the movement direction and movement distance of the projection apparatus 10 from the acquired rotation angle of the motor shaft, and calculates the moved position P1 (X1, Y1).

  Then, the information processing means 180 calculates a newly set angle HA1 of the projection direction from the positional relationship between P0 and P1. When the projection direction to be newly set is calculated, the information processing unit 180 designates the driver 70 that drives the left / right motor 48W of the projection state changing unit 40 to the I / O 166 and outputs the rotation angle. To do.

  The driver 70 that has acquired the information on the rotation angle outputs electric power for driving the projection unit 11 leftward by a predetermined rotation angle to the motor 48W while referring to the output of the encoder 50W. The motor 48W supplied with electric power rotates the friction roller 46W in a predetermined direction. The friction roller 46W is in contact with the spherical protrusion 42 and rotates the spherical protrusion 42 in a predetermined direction. Then, the projection means 11 configured integrally with the spherical protrusion 42 rotates by the angle HA1, and the projection means 11 is set to the angle HA1. Then, since the projection direction of the projection light 14 is the direction of the point Q before the movement, even when the projection apparatus 10 is moved, the projection apparatus 10 displays the video 18 in a predetermined direction where the screen 16 exists. Adjust the projection automatically. Therefore, even when the projection device 10 is moved, it is possible to reduce the trouble of the user adjusting the projection direction of the video 18.

  Similarly to the processing described with reference to FIG. 3, the in-focus position, the light amount, or the angle of view when the projection apparatus 10 is moved from the position P0 (X0, Y0) before the movement to the position P1 (X1, Y1). Can be adjusted automatically.

  Next, an embodiment in which the tilt angle of the projected image 18 is automatically adjusted when the projection apparatus 10 is moved will be described with reference to FIGS.

  FIG. 5 is a diagram illustrating the shape of the image 18 displayed on the screen 16 when the projection direction of the projection light 14 is parallel to the normal line of the screen 16 and has a predetermined elevation angle. On the other hand, FIG. 6 is displayed on the screen 16 when the projection device 10 is moved in parallel with the plane of the screen 16 and thus the projection light 14 and the normal line of the screen 16 are not parallel. It is a figure which shows the shape of the image | video 18.

  The image 18 shown in FIG. 5 is substantially rectangular, but when the projection light 14 and the normal line of the screen 16 are not parallel as shown in FIG. 6, the image 18 is inclined at a predetermined angle RA1. End up. Conventionally, when the video is tilted, the user corrects the tilt of the video 18 by adjusting the tilt of the entire projection apparatus 10. However, in the present invention, the information processing unit 180 The projection direction of the image 18 is calculated by measuring the amount of movement of the projection device 10 relative to the installation surface 12, and the tilt angle of the image 18 is calculated from the vertical angle and the horizontal angle of the projection light 14. Then, the information processing means 180 designates the driver 70 that drives the motor 48R of the projection state changing means 40 to the I / O 166 and outputs the tilt angle.

  The driver 70 that has acquired the information on the tilt angle outputs electric power for driving the projection unit 11 leftward by a predetermined rotation angle to the motor 48R while referring to the output of the encoder 50R. The motor 48R supplied with electric power rotates the friction roller 46R in a predetermined direction. The friction roller 46R is in contact with the spherical protrusion 42 and rotates the spherical protrusion 42 in a predetermined direction. Then, the projection means 11 configured integrally with the spherical protrusion 42 rotates by an angle RA1. Then, since the tilt angle of the projection light 14 is substantially parallel to the screen 16, even when the projection device 10 is moved, adjustment to project the projected image 18 substantially parallel to the screen 16 is performed. Do it automatically. Therefore, even when the projection apparatus 10 is moved, it is possible to reduce the trouble of the user adjusting the tilt angle of the video 18.

  Next, another embodiment of the projection apparatus according to the present invention will be described with reference to FIGS. In FIG. 1 described above, an angle changing unit is used as a projection state changing unit for changing the projection direction of the projection light 14, and a vertical moving unit that moves the projected image 18 in the vertical direction with respect to the installation surface 12; Although the embodiment provided with the left-right direction moving means for moving the projected image 18 in the left-right direction has been shown, in the embodiment shown in FIGS. 7 and 8, for example, the up-down direction moving means that can move in the orthogonal three-axis directions, And the embodiment provided with the left-right direction moving means is shown.

  FIG. 7 is a side view showing a state in which the projection apparatus 310 having the orthogonal three-axis moving means is placed on the installation surface 12 and the image 18 is projected onto the screen 16.

  FIG. 8 is a diagram showing a state observed from the rear of the projection apparatus 310 shown in FIG. 7 toward the screen 16.

  As shown in FIG. 7, the projection apparatus 310 includes a projection unit 11 for projecting the projection light 14, and a support body 60 including a moving unit configured to move the projection unit 11 relative to the installation surface 12. I have. Since the functions of the projection unit 11 and the support 60 have the same functions as those shown in FIG. 1, the description thereof is omitted here.

  Between the support 60 and the projection unit 11, an X table 390 and a Y table 392 that allow the projection unit 11 to move parallel to the installation surface 12, and the projection unit 11 are guided perpendicularly to the installation surface 12. Projection state changing means including a Z axis 394 and a Z slider 396 is provided.

  The X table 390, the Y table 392, the Z axis 394, and the Z slider 396 include projection state changing means including a motor for driving the projection means 11 in the three axis directions of X, Y, and Z, and the amount of movement of each axis. And an encoder for detecting. In addition, the projection device 310 includes a control device 110 that calculates the projection direction of the video 18 based on the movement amount of the projection device 310 measured by the movement amount measuring means provided inside the support body 60. The projection direction of the image 18 can be changed based on the projection direction output from the control device 110. Further, as shown in FIG. 8, the Z slider 396 is provided with an inclination angle changing means for changing the inclination angle of the projected image 18 by inclining the projection means 11 about the RC axis.

  By configuring the projection device 310 in this way, even when the projection device 310 is moved relative to the screen 16, the projection device 310 automatically adjusts to project an image in the direction in which the screen 16 exists. It becomes possible. Therefore, even when the projection device 310 is moved, it is possible to reduce the trouble of the user adjusting the projection direction of the video 18.

  The position information of the projection device 10 with respect to the screen 16 is stored, the position information and the projection state information are associated with each other in a table, and each time the projection device 10 is moved, the stored position information is matched with the movement distance. Thus, the information of the new projection state can be obtained from the corresponding new position information, and the change amount of the projection state can be calculated.

  The location information may be stored by manually operating the input unit 170 by the user, or may be stored at regular intervals measured by the time measuring unit 190.

  Also, the counter 169 of the projection apparatus 10 may be stored at the moment when the movement is detected. In particular, if the position information is always stored at a plurality of timings immediately before according to the detection resolution of the moving means 81, the position information immediately before the moment when the movement is detected can be read, and the projection state can be more accurately determined. Can be set.

  Further, if the present invention is used in reverse and the recommended projection position is stored in the RAM 181 by default, the moving unit 81 or the like is brought into the projection state with the optimum image quality recommended by the manufacturer regardless of the position of the projection apparatus. It can also be easily arranged using.

  Also, a correspondence table of projection states such as the angle of view, tilt angle, zoom, focus, etc. before movement and position information of the projection apparatus 10 is stored in advance in a storage unit such as the RAM 181 and the projection state thus set is determined. Corresponding position information may be calculated and stored.

  The stored position information is updated every period t. Preferably, the position information before the update is also left for a certain period of time. Since the data immediately before the movement remains when the movement is detected, the positional information immediately before the movement can be accurately identified.

  Further, it is effective for the reason described above that position information for each of several projection states is preferably stored as a setting value recommended by the manufacturer.

  When the movement of the projection device 10 is detected, the stored previous position information is read. When the movement is stopped, the movement distance is calculated, and the latest movement distance is calculated from the calculated movement distance and the read position information. The position information may be calculated. When the projection device 10 is configured in this way, the projection state after the change is calculated from the latest position information and the correspondence table, the difference from the data before the movement is calculated, and as a result, the change amount of the projection state can be calculated, The projection state can be changed by the change amount.

  Next, FIG. 9 shows the relationship between the half angle φ of the projection angle of view and the rate of change in the ratio of the upper and lower sides of the projected image.

  As shown in FIG. 9, when the half φ of the projected field angle exceeds 50 degrees, the rate of change of the ratio (M / M ′) of the upper and lower sides of the projected image suddenly increases. Therefore, only when the rate of change of the ratio of the upper side and lower side of the projected trapezoidal image to the rotation angle increases rapidly by changing the projection state when half of the angle of view of the projected image exceeds 50 degrees. The projection state can be changed.

It is sectional drawing of the projection apparatus 10 which concerns on embodiment of this invention. 2 is a block diagram of a control device 110 in the projection device 10. FIG. FIG. 10 is a diagram showing an embodiment in which the projection direction, the in-focus position, the light amount, or the angle of view is automatically adjusted when the projection apparatus 10 is moved away from the screen 16. It is a figure which shows embodiment which adjusts a projection direction, a focus position, a light quantity, or a field angle automatically, when the projection apparatus 10 is moved from P0 to P1. It is a figure which shows the shape of the image | video 18 displayed on the screen 16, when the projection direction of the projection light 14 is parallel to the normal line of the screen 16, and has a predetermined elevation angle. The figure which shows the shape of the image | video 18 displayed on the screen 16 when the projection light 14 and the normal line of the screen 16 will be in the state which is not parallel by moving the projection apparatus 10 in parallel with the surface of the screen 16. It is. FIG. 4 is a side view showing a state in which a projection apparatus 310 having three orthogonal axes moving means is placed on the installation surface 12 and an image 18 is projected onto a screen 16. It is a figure which shows the state which observed the projection apparatus 310 shown in FIG. 7 toward the screen 16 from back. It is a figure which shows the relationship between projection angle of view (phi) and the change rate of ratio (M / M ') of the upper side lower side of a projection image | video.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Projection apparatus 11 Projection means 12 Installation surface 14 Projection light 16 Screen 18 Image | video 20 Light emission means 22 Diaphragm 24 Illumination optical system 26 Light modulation means 28 Projection lens 30 Variator lens group 32 Compensator lens group 34 Focusing lens group 40 Projection state change means 41 Spherical bearing 42 Spherical protrusion 44 Spherical groove 46, 46X, 46Y, 46P, 46W, 46R Friction rollers 48, 48X, 48Y, 48P, 48W, 48R Motor 50, 50X, 50Y, 50P, 50W, 50R Encoder 60 Support 61 Spherical surface Bearing 62 Spherical rotating body 64 Spherical groove 70 Driver 81 Moving means 110 Controller 164 Projection driver 166 I / O
169 Counter 170 Input means 171 Input I / F
180 Information processing means 181 RAM
183 ROM
190 Timekeeping means 199 Bus 310 Projector 390 X table 392 Y table 394 Z axis 396 Z slider

Claims (14)

A projection device that is placed on an installation surface and can project an image on a screen on a plane that intersects the installation surface,
Moving means configured to move the projection device relative to the installation surface;
Projection state changing means for changing the projection state of the video;
A moving amount measuring means for measuring a moving amount when moved by the moving means;
A projection state calculation means for calculating a change amount of the projection state from the projection state before the movement based on the measured movement amount;
The projection apparatus, wherein the projection state changing unit changes a projection state of an image based on a change amount of the projection state calculated by the calculating unit.   The projection state calculation unit includes a projection state storage unit that stores a projection state before movement, and calculates a change amount of the projection state based on the stored projection state before movement and the measured movement amount. The projection device according to claim 1. The moving means has a rotating body that contacts the installation surface,
The projection apparatus according to claim 1, wherein the movement amount measuring unit is an encoder that measures a rotation amount of the rotating body.   The movement amount measuring means is configured to rotate a spherical rotator according to a relative movement with respect to the installation surface by bringing a part of the sphere into contact with the installation surface, and to rotate the spherical rotator. The projection apparatus according to claim 1, further comprising: a rotating body receiving unit that is held by the encoder and an encoder that measures a rotation amount of the spherical rotating body.   The projection apparatus according to claim 4, wherein the movement amount measurement unit includes an encoder that measures a rotation amount of the spherical rotating body in two orthogonal axes.   The projection apparatus according to claim 1, wherein an optical encoder that optically measures a movement amount is used as the movement amount measuring unit.   The projection state changing means is a vertical movement means for moving the projected video in the vertical direction with respect to the installation surface, a horizontal movement means for moving the projected video in the horizontal direction, or the projected image. The projection apparatus according to claim 1, further comprising an inclination angle changing unit that changes an inclination angle of the image.   The projection state changing means includes a spherical protrusion and a spherical groove for rotatably holding the spherical protrusion between the projecting means for projecting an image and the moving means, and the image with respect to the installation surface. The projection apparatus according to claim 1, wherein the projection apparatus is movable in a vertical direction and a horizontal direction, and an inclination angle of the video is freely changeable.   The projection apparatus according to claim 1, further comprising a light amount adjusting unit configured to adjust a light amount of the image according to the movement amount or a projection direction of the image.   The projection apparatus according to claim 1, further comprising a focus position adjusting unit that adjusts a focus position of the video according to the movement amount or the projection direction of the video. .   The projection apparatus according to claim 1, further comprising an angle-of-view adjusting unit that adjusts an angle of view of the video according to the amount of movement or a projection direction of the video. Comprising reference setting means for setting a reference value of a position relative to a screen on which an image is projected;
The projection apparatus according to claim 1, wherein the projection state calculation unit changes a projection direction of an image based on the reference value and the movement amount.   The projection apparatus according to claim 1, wherein the projection state of the video is changed when half of the angle of view of the video exceeds 50 degrees.   The projection apparatus according to claim 1, wherein the moving unit includes a low friction contact surface.

Images