JP5192669B2 - Projector, position adjusting device, and position adjusting method - Google Patents

Description

  The present invention relates to a projector, and a position adjusting device and a position adjusting method for adjusting the position of an image projection apparatus such as a projector or a projector.

  When using a conventional projector, it is necessary to manually adjust the focus of the projection image and correct the distortion of the projection image. However, there is a projector that can automatically perform focus adjustment using an autofocus function. One of the operations required for the autofocus function is to measure the distance to the object. Various devices have been devised for the distance measuring device for measuring the distance.

  For example, a distance measuring device that measures the distance to an object multiple times, calculates an average value, determines variation, and controls the light emission output of light emitting means, which is one of the device configurations, corresponding to the variation is disclosed. (See Patent Document 1).

  On the other hand, as a projector, there is an ultra-short focus projector that projects an image from a mirror instead of a projection lens and is suitable for use in a place where a distance to a projection surface such as a wall or a screen is short. An ultra-short focus projector projects an image on a projection surface using a mirror projection method.

  FIG. 12 is a schematic diagram for explaining a mirror projection method used in a short focus projector.

As shown in FIG. 12, the ultra-short focus projector sequentially reflects and enlarges the images irradiated from the DMD (Digital Micromirror Device) 100 of the image display element to the mirrors 101 to 104, and the image reflected by the mirror 104 is finally obtained. Is projected onto the projection surface.
JP-A-6-160085

  As described above, if the autofocus function is used for adjusting the focus of the projected image, the operator does not need to perform the focusing himself. However, for distortions in the projected image that occur when the projector and the projection surface are not facing each other in the horizontal direction (perpendicular to the vertical direction), the operator himself changes the position of the projector and moves the projector to the projection surface. Must be directly facing.

  13 to 15 are diagrams showing a case where an image is projected with the projector facing the projection surface. FIG. 13 is a view of the projection surface and the projector as viewed from the side, and FIG. 14 is a view as viewed from above. FIG. 15 is a diagram showing a projected image. When the ultra-short focus projector faces the projection surface, the projection image becomes a rectangle with straight sides as shown in FIG.

  Next, a case where the projector is not directly facing the projection surface will be described. FIG. 16 is a view of the projection surface and the projector as seen from above, and FIG. 17 is a view showing a projection image. In the projection image shown in FIG. 17, the left end is a straight line, but the upper end, the lower end, and the right end are distorted. Although the contents of the image are not shown in the figure, the image itself is distorted as it goes to the right side. Image distortion occurs when the distance from the projector to the projection surface differs between the left side and the right side of the projector. In the case shown in FIG. 16, the distance is longer on the right side than on the left side of the projector. The greater the difference in distance, the greater the image distortion. When the difference in distance is the same, the shorter the distance to the projection surface facing the projector, the greater the image distortion.

  In order to make the distance from the left and right sides of the projector to the projection surface the same, fine adjustment is required, and there is a problem that it is difficult if it is manual. In particular, when used in a place where the distance to the projection surface is short, there is a problem that adjustment becomes more difficult.

  The present invention has been made to solve the above-described problems, and provides a projector, a position adjusting device, and a position adjusting method that can face the projection surface without manual adjustment. Objective.

In order to achieve the above object, according to one aspect of the present invention,
In a projector having a main body and a pedestal,
A projection mechanism provided in the main body and projecting an image on a projection surface;
A first and a second distance measuring sensors provided in the main body, further provided in the left-right direction across the projection mechanism, for measuring the distance to the projection surface;
A rotation mechanism that rotates the main body in the left-right direction around the rotation axis of the pedestal;
Based on the detection contents of the first and second distance measuring sensors, a first distance and a second distance that are distances from the first and second distance measuring sensors to the projection surface are calculated. , possess a control unit for the difference between the first and second distances issued the calculated controls the rotation mechanism so as to minimize, and the the measurement direction of the first distance measuring sensor The first angle formed by the projection axis of the projection mechanism has a predetermined spread angle in the left-right direction, and the second angle formed by the measurement direction of the second distance measuring sensor and the projection axis of the projection mechanism is: A projector is provided that has an angle that is symmetrical to the first angle and the left-right direction with respect to a projection axis of the projection mechanism .

In this case, the first and second distance measuring sensors may be arranged symmetrically with respect to the optical axis of the projection mechanism and a line connecting them may be parallel to the bottom surface portion.

In addition, the rotation mechanism unit rotates the main body at a predetermined step angle in accordance with the input first control signal, and changes the image projection angle on the projection surface, whereby the first and second Change the distance,
The control unit transmits the first control signal to the rotation mechanism unit, and each time the rotation mechanism unit rotates the main body by the step angle, the detection contents of the first and second ranging sensors are detected. Based on this, the first distance and the second distance may be calculated, and the main body may be rotated to a rotation angle at which a difference between these distances is minimized .

In addition, a storage unit, the control unit,
Each time the rotation mechanism unit rotates the main body , data indicating the rotation angle of the rotation mechanism unit and the first and second distances at the rotation angle are stored in the storage unit, and are shown in these data. The rotation angle that minimizes the difference in the distance to be detected may be retrieved from the data.

In addition, the main body includes a focus adjustment unit that drives the projection mechanism by an input second control signal to adjust the focus of the image,
The controller is
An object to which an image is focused based on the first distance or the second distance at the rotation angle after the main body is rotated to a rotation angle at which the difference between the first and second distances is minimized. May be calculated, and the second control signal based on the distance may be transmitted to the focus adjustment unit.

According to another aspect of the present invention, in a position adjusting device comprising a position adjusting table on which an image projection device can be mounted, and a rotating shaft for rotating the position adjusting table,
First and second measurements are provided on the position adjustment table, and are provided in the left-right direction across the rotation axis to measure the distance from the image projection device to the projection surface on which the image is projected. A distance sensor;
A rotation mechanism that rotates the position adjustment table in the left-right direction around the rotation axis;
Based on the detection contents of the first and second distance measuring sensors, a first distance and a second distance that are distances from the first and second distance measuring sensors to the projection surface are calculated. , possess a control unit for the difference between the first and second distances issued the calculated controls the rotation mechanism so as to minimize, and the the measurement direction of the first distance measuring sensor The first angle formed by the projection axis of the image projection apparatus has a predetermined spread angle in the left-right direction, and the second angle formed by the measurement direction of the second distance measuring sensor and the projection axis of the image projection apparatus. The position at which the first and second distance measuring sensors are arranged so that the angle is symmetrical with respect to the projection axis of the image projection apparatus in the left-right direction with respect to the first angle. An adjustment device is provided.

In this case, the first and second distance measuring sensors may be arranged symmetrically with respect to the rotation axis , and a line connecting them may be parallel to the bottom surface of the image projection apparatus.
In addition, the rotation mechanism unit rotates the position adjustment table at a predetermined step angle in response to the input first control signal, thereby changing the image projection angle on the projection surface, whereby the first and first Change the distance of 2,
The control unit transmits the first control signal to the rotation mechanism unit, and each time the rotation mechanism unit rotates the position adjustment table by the step angle, the detection of the first and second ranging sensors. The first distance and the second distance may be calculated based on the contents, and the position adjustment table may be rotated to a rotation angle that minimizes the difference between these distances.

In addition, a storage unit, the control unit,
Each time the rotation mechanism unit rotates the position adjustment table, the storage unit stores data indicating the rotation angle of the rotation mechanism unit and the first and second distances at the rotation angle. the rotational angle difference becomes a minimum distance may be retrieved from the data shown in.

According to still another aspect of the present invention, there is provided a projector position adjustment method including a main body and a pedestal,
The main body is provided with a projection mechanism for projecting an image on the projection surface, and further, first and second distance measuring sensors for measuring the distance to the projection surface are arranged in the left-right direction across the projection mechanism. Provided,
A rotation mechanism for rotating the main body in the left-right direction around the rotation axis of the pedestal;
The first angle formed by the measurement direction of the first distance sensor and the projection axis of the projection mechanism has a predetermined spread angle in the left-right direction, and the measurement direction of the second distance sensor and the projection The second angle formed by the projection axis of the mechanism is symmetric with respect to the projection axis of the projection mechanism in the left-right direction with respect to the first angle. Place the distance sensor,
Based on the detection contents of the first and second distance measuring sensors, a first distance and a second distance that are distances from the first and second distance measuring sensors to the projection surface are calculated. There is provided a position adjustment method for controlling the rotation mechanism so that the difference between the calculated first distance and the second distance is minimized.

In this case, the first and second distance measuring sensors may be arranged symmetrically with respect to the optical axis of the projection mechanism, and a line connecting them may be parallel to the bottom surface of the projector .

In addition, the rotation mechanism unit rotates the main body at a predetermined step angle in accordance with the input first control signal, and changes the image projection angle on the projection surface, whereby the first and second Change the distance,
The first control signal is transmitted to the rotation mechanism unit, and the rotation mechanism unit rotates the main body by the step angle, based on the detection contents of the first and second ranging sensors. And the second distance may be calculated, and the main body may be rotated to a rotation angle at which the difference between these distances is minimized .

Further, every time the body is rotated, a front Kikai rotation angle, the data indicating the first and second distance in the rotation angle stored, the rotation difference of the distances shown in these data is minimized The corner may be searched from the data.

  According to the present invention, two distance measuring sensors are arranged such that the line connecting them is parallel to the bottom surface (the height from the bottom surface of the apparatus main body is the same), and each distance measuring sensor is placed on the optical axis of the projected image. When provided at a position that is symmetrical with respect to the horizontal direction, when general image projection is performed with the horizontal direction as the upper end or the lower end, a line connecting the measurement positions on the projection surface side of the distance measuring sensors 12 and 13 is projected. Parallel to the top and bottom edges of the image. In addition, a projected image within a predetermined range in which the distance measurement values are considered to be substantially equal has a small distortion and has substantially the same shape as the projected image when facing in the horizontal direction.

  In the present invention, since the projection mechanism is rotated to a position where the distances from the two distance measuring sensors arranged symmetrically with respect to the optical axis of the projection mechanism to the projection surface are the same, the projector is not adjusted manually. It is possible to face the projection surface. Further, since the projector itself performs fine adjustment to make both the left side and the right side of the projector the same distance as the projection surface, which is difficult manually, the labor of the operator is reduced.

  The projector of the present invention includes two distance measuring sensors for measuring the distance to the projection surface, and a rotation mechanism for rotating the projection mechanism to a position where the difference between the measured distances is within a predetermined range. Features.

  The configuration of the projector of this embodiment will be described.

  FIG. 1 is a block diagram illustrating a configuration example of a projector according to the present embodiment.

  As shown in FIG. 1, the projector according to the present embodiment has a configuration including a projector main body 1 and a pedestal 2 for rotating the projector main body 1 around a vertical axis.

  The projector main body 1 includes an operation unit 11 provided with a plurality of buttons for operating the projector main body 1, distance measuring centers 12 and 13 for measuring the distance to the projection surface, and an angle at which the projector main body 1 is rotated. And a storage unit 14 for storing data of distances calculated based on the detection contents of the distance measuring sensors 12 and 13, a control unit 15 for controlling the operation of rotating the projector body 1 and the focus operation, and a mirror A projection mechanism 21 that projects in a projection method, a focus adjustment unit 22 that adjusts the focus position by moving the projection mechanism 21 in accordance with a control signal from the control unit 15, and a projector main body 1 for rotating the projector body 1 about the vertical axis A rotation mechanism.

  The rotation mechanism unit transmits and receives a signal related to the rotation angle of the projector main body 1 to and from the control unit 15, and rotates according to the control of the motor control unit 18 and the motor control unit 18 that adjusts the rotation angle of the projector main body 1. A motor 19 and a gear 20 that moves circularly while rotating on the base 2 according to the number of rotations of the motor 19 are provided.

  The plurality of buttons provided on the operation unit 11 include a facing adjustment button for operating a function facing the projection surface.

  The distance sensor 12 and the distance sensor 13 will be described.

  As shown in FIG. 1, a distance measuring sensor 12 is provided on the left side and a distance measuring sensor 13 is provided on the right side from the projector body 1 toward the projection surface. The distance measuring sensors 12 and 13 have the same configuration and operation except for the positions where they are arranged. FIG. 2 is a schematic diagram illustrating an example of the distance measuring sensors 12 and 13.

  As shown in FIG. 2, the distance measuring sensors 12 and 13 include a light emitting device 201 and an image receiving device 202. The light emitting device 201 has a configuration in which an LED (Light Emitting Diode) or a laser is used as a light emitting element. On the other hand, the image receiving device 202 includes any one of a CCD (Charge Coupled Device) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and a PSD (Position Sensitive Detector) as a position detection element. It is the composition which includes.

  The operation of the distance measuring sensors 12 and 13 will be described. When the control unit 15 causes the light emitting device 201 to emit light, the light output from the light emitting device 201 is reflected by the projection surface and detected by the image receiving device 202. At this time, the light receiving position of the image receiving device 202 differs depending on the distance from the projection surface. In the case of the projection surface 205 as shown in FIG. On the other hand, in the case of the projection surface 206, the light receiving point 204 is detected. The image receiving device 202 determines an output voltage corresponding to the received point. Then, an electric signal indicating the output voltage is transmitted to the control unit 15. It is possible to measure the distance from the projector to the projection plane based on the electrical signal output from the distance measuring sensors 12 and 13 by using the characteristic that the output voltage is determined according to the position where the image receiving device 202 receives light. Become.

  Subsequently, the arrangement conditions of the distance measuring sensors 12 and 13 will be described.

FIG. 3 is a schematic diagram showing positions where the distance measuring sensors 12 and 13 are arranged. The angle θ ₀ of the horizontal spread of the projection light 301 with respect to the projection optical axis 302 is optically designed and determined in advance. As shown in FIG. 3, the distance measuring sensor 12 and the distance measuring sensor 13 are arranged so as to be symmetrical with respect to the projection optical axis 302. Further, the light emitting path 303 output from the light emitting device of the distance measuring sensor 12 and the light emitting path 304 output from the light emitting device of the distance measuring sensor 13 are measured so that the angles with respect to the projection optical axis 302 are the angle θ _0. Distance sensors 12 and 13 are arranged.

  The position on the projection surface side when the distance measuring sensors 12 and 13 measure the distance to the projection surface will be described.

  FIG. 4 shows the position on the projection surface side when the distance measuring sensors 12 and 13 each measure the distance. As shown in FIG. 4, it is assumed that the projected image 401 is a rectangle having a left end and a right end parallel to the vertical direction and the same length, and an upper end and a lower end in the horizontal direction and the same length. In this case, the point 402 of the measurement position of the distance measuring sensor 12 is on the center line 405 passing through the midpoints of the left side and the right side of the projection image 401, on the left side of the projection image 401, and outside the projection image 401. Become. On the other hand, the point 403 of the measurement position of the distance measuring sensor 13 is on the center line 405, on the right side of the projection image 401, and outside the projection image 401. Thereby, when the distance measurement values of the distance sensors 12 and 13 are the same, the projector main body 1 faces the projection surface. In addition, a projected image within a predetermined range in which the distance measurement values can be regarded as substantially equal has a small distortion and has substantially the same shape as the projected image when facing the front.

  Note that the vertical and horizontal sizes of the projected image are optically designed and determined in advance.

  The control unit 15 includes a CPU (Central Processing Unit) 16 that performs predetermined processing according to a program, and a memory 17 that stores the program.

  When the facing adjustment button of the operation unit 11 is pressed, the CPU 16 causes the light emitting devices of the distance measuring sensors 12 and 13 to emit light. Then, the distances to the projection surfaces of the distance measuring sensors 12 and 13 are calculated based on the detection contents of the image receiving devices of the distance measuring sensors 12 and 13, respectively. Then, the calculated distance and the rotation angle that is the angle at which the projector main body 1 rotates corresponding to the distance are stored in the storage unit 14. At this time, the rotation angle is set to 0 degree in the direction of the projection surface of the projection optical axis at the place where the projector of the present embodiment is first installed, and the counterclockwise angle with respect to 0 degree is set to a negative angle, and clockwise. The (clockwise) angle is a positive angle.

  In addition, a measurement range angle that is a measurement range of the rotation angle and a step angle that is a predetermined angle that the distance measurement sensors 12 and 13 measure in a stepwise manner within the measurement range angle are set in advance. The step angle is set to an arbitrary value less than 10 degrees. As the step angle is smaller, more distance data can be acquired, but the time until the measurement is completed becomes longer.

  Subsequently, the CPU 16 transmits a control signal indicating the rotation angle to the motor control unit 18. Thereafter, when a signal indicating that the projector main body 1 has been rotated to the specified rotation angle is received from the motor control unit 18, the light emitting devices of the distance measuring sensors 12 and 13 are caused to emit light again. When the distance measurement is completed, the storage unit 14 is searched for an angle within a predetermined range in which the distances to the projection surfaces of the distance measurement sensors 12 and 13 are the same or substantially equal. Then, a control signal is transmitted to the motor control unit 18 so that the projector main body 1 rotates at that angle.

  The storage unit 14 stores distance data calculated based on detection contents of the distance measuring sensors 12 and 13 and rotation angle data when these distances are measured.

  In addition, when the projector body 1 is rotated to an angle at which the projector body 1 is positioned within a predetermined range in which the distances to the projection surfaces of the distance measuring sensors 12 and 13 are the same or substantially equal, the distance to be focused is determined. The control signal based on the distance is calculated and transmitted to the focus adjustment unit 22.

  The projection mechanism 21 includes the DMD 100 shown in FIG. 12 and mirrors 101 to 104 as in the conventional short focus projector. Light rays are sequentially reflected from the DMD 100 to enlarge the image, and finally the mirror 104 projects onto the projection surface. In this embodiment, the mirror 103 has a mechanism that can move back and forth with respect to the optical axis. Using this mechanism, the focus position of the projection image projected from the mirror 104 is adjusted.

  The focus adjustment unit 22 has a motor (not shown) for moving the mirror 103 and drives the motor according to a control signal from the CPU 16.

  The projection mechanism 21 may use a general projection lens. In this case, the focus adjustment unit 22 has a motor for moving the focus lens in the projection lens, and drives the motor in accordance with a control signal from the CPU 16.

  FIG. 5 is a schematic diagram illustrating an example of connection between the projector main body 1 and the pedestal 2. FIG. 6 is a schematic diagram for explaining the rotation operation of the projector body 1.

  As shown in FIG. 5, the pedestal 2 is connected to the projector main body 1 via the center and a vertical axis. Further, as shown in FIG. 6, a rotation guide serving as a rotation path of the gear 20 is provided in a circular shape around the vertical axis at the upper portion of the base 2. The vertical axis is located at the center of each of the pedestal 2 and the projector main body 1 and serves as a rotation axis when the projector main body 1 rotates. Although the rotation direction is shown in the counterclockwise direction in FIG. 6, it may be clockwise.

  Next, the operation of the projector of this embodiment will be described.

  FIG. 7 is a flowchart showing an operation procedure of the projector according to the present embodiment. Here, the measurement range angle is between −40 degrees and +40 degrees.

  When the projector according to the present embodiment is placed on an arbitrary table and the facing adjustment button of the operation unit 11 is pressed, the CPU 16 measures the distance to the projection surface when the rotation angle is 0 degrees in the initial state. The light emitting devices of the distance measuring sensor 12 and the distance measuring sensor 13 are caused to emit light. Then, the distance to the projection surface is calculated based on the contents detected from the image receiving devices of the distance measuring sensor 12 and the distance measuring sensor 13 (step 1001). As described with reference to FIG. 3, the position to be measured on the projection surface side is preset with respect to the projection image. The distance measuring sensor 12 measures the point 402 and the distance measuring sensor 13 measures the point 403.

  When the distances to the respective projection surfaces of the two sensors are calculated, data indicating the rotation angle of the projector body 1 and the distances to the respective projection surfaces of the distance measuring sensors 12 and 13 at the rotation angle is stored in the storage unit 14. (Step 1002).

  The CPU 16 transmits a control signal to the motor control unit 18 so as to rotate the projector main body 1 at a predetermined step angle. The motor control unit 18 controls the operation of the motor 19 according to the control signal. When the motor 19 rotates, the gear 20 moves on the rotation guide of the base 2, and the projector body 1 rotates by a predetermined step angle.

  Steps 1001 and 1002 are performed every time the projector body 1 is rotated by a predetermined step angle within the measurement range angle (step 1003). When all the distance measurements are completed at the measurement range angle, the process proceeds to step 1004.

  FIG. 8 is a graph of the data stored in the storage unit when all the measurements are completed in step 1003. As shown in FIG. 8, the horizontal axis is the rotation angle of the projector body 1, and the vertical axis is the distance to the projection surface of the distance measuring sensors 12 and 13. The distance on the vertical axis increases as the distance from the contact point with the horizontal axis increases, and decreases as the distance from the contact point increases. When the distance measurement is completed, the CPU 16 searches for a facing point 801 where the distances to the projection surfaces of the distance measurement sensors 12 and 13 shown in FIG. 8 are the same, or a position within a predetermined range that is considered to be substantially equal. (Step 1004). Although the measurement range angle is limited to -40 degrees to 40 degrees here, it can be arbitrarily set within the range of -180 degrees to 180 degrees.

  When the position is specified, the rotation mechanism unit rotates the projector body 1 to that position (step 1005). The operation of step 1004 may be performed every time the projector body 1 rotates to the step angle. In this case, if the facing point 801 is reached in the middle of the rotation, the process immediately proceeds to step 1005, and it is not necessary to measure the distance for all the step angles in the measurement range angle, thereby shortening the time required for the projector to face the projection surface. it can.

  When the projector body 1 rotates to the position of step 1005, an autofocus operation is performed (step 1006).

  Next, the focus adjustment operation will be described. Here, it is assumed that the projector body 1 is located at the rotation angle of the directly facing point 801.

FIG. 9 is a diagram for explaining the focus operation. As shown in FIG. 9, the distance from the distance sensor 12 or the distance measuring sensor 13 in the facing point 801 to the projection surface is inclined angle theta ₀ with respect to the optical axis of the projection mechanism 21, a right angle with an angle theta ₀ The length of the hypotenuse of the triangle corresponds to the distance. Since this distance is a distance calculated based on the detection contents of the distance measuring sensors 12 and 13, it is hereinafter referred to as a measurement distance.

As shown in FIG. 9, the distance from the projector main body 1 to the projection plane when the projector main body 1 is rotated to the point 801 facing the projection plane is the focus adjustment target distance for focusing the image on the projection plane. To do. The focus adjustment target distance is calculated by the following expression using the measurement distance at the directly facing point 801 identified by the search in step 1003 and the angle θ ₀ .

Focus adjustment target distance = measurement distance x Cosθ ₀ (1)
The value of Cosθ ₀ is described as a constant in advance in a program to be executed by the CPU 16. In addition, the program describes an expression for calculating the position of the mirror 103 corresponding to the focus adjustment target distance in order to focus the image on the projection surface with an arbitrary value of the focus adjustment target distance. ing.

  When the projector body 1 faces the projection surface, the control unit 15 calculates the focus adjustment target distance from the above equation (1). Subsequently, information on the optimal position of the mirror 103 is obtained from the calculated focus adjustment target distance, and a control signal including information on the position of the mirror 103 is transmitted to the focus adjustment unit 22. When the focus adjustment unit 22 receives a control signal including information on the position of the mirror 103 from the control unit 15, the focus adjustment unit 22 drives a motor (not shown) for moving the mirror 103 in accordance with the control signal. The mirror 103 moves forward or backward with respect to the optical axis. Thereby, it adjusts so that the image of a projection surface may be focused.

  If the position of the projector main body 1 is not the directly facing point 801 but the distances to the projection surfaces of the distance measuring sensor 12 and the distance measuring sensor 13 are within a predetermined range that can be regarded as substantially equal, the above formula (1) The measurement distance may be a distance from one of the positions to the projection surface.

  In the projector of this embodiment, the projector main body 1 including the control unit 15, the operation unit 11, the storage unit 14, and the like is rotated, but the configuration including the projection mechanism 21, the distance measuring sensors 12, 13 and the focus adjustment unit 22 is included. May be an image projection unit, and at least the image projection unit may be rotated by a rotation mechanism unit. The control unit 15, the operation unit 11, and the storage unit 14 may not be rotated.

  As described above, the projector according to the present embodiment rotates the projector main body 1 at a predetermined step angle in the measurement range angle so that the distances to the projection surfaces of the two distance measuring sensors are the same or almost the same. A position within a predetermined range that is considered to be equal is searched to identify the corresponding position. When the distances are the same, the projector faces the projection surface by rotating the image projection unit to that position. As a result, there is no need to manually adjust the projector to face the projection surface.

  Further, since the projector itself performs fine adjustment to make both the left side and the right side of the projector the same distance as the projection surface, which is difficult manually, the labor of the operator is reduced. In particular, when the distance from the projection surface is short like an ultra-short focus projector, the adjustment becomes more difficult, but the operator does not need to make a fine adjustment.

  Further, when the projector faces the projection surface, it is possible to calculate the shortest distance to the projection image and adjust the focus of the projection image based on the distance.

  The present embodiment relates to a position adjustment device that causes a conventional projector to face the projection surface without a human hand. The projector 21 and the focus adjustment unit 22 are changed from the projector described in the first embodiment. It is a device that removes and adjusts to face the projection surface.

  FIG. 10 is a block diagram showing an example of the configuration of the position adjustment apparatus of the present embodiment. The same components as those in the projector according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The position adjusting device of the present embodiment is configured to include a device main body 110 and a base 2 for rotating the device main body 110 about a vertical axis. As illustrated in FIG. 10, the apparatus main body 110 includes an operation unit 11, a distance measurement sensor 12, a distance measurement sensor 13, a storage unit 14, a control unit 15, a motor control unit 18, a motor 19, and a gear 20.

  In the present embodiment, the distance measuring sensors 12 and 13 have the same height from the bottom surface of the apparatus main body 110. As a result, when general image projection with the horizontal direction as the upper end or lower end is performed, the lines connecting the measurement positions on the projection surface side of the distance measuring sensors 12 and 13 are parallel to the upper end and lower end of the projection image. When the distance measurement values of the two distance measurement sensors are the same, the projector faces the projection surface. In addition, a projected image within a predetermined range in which the distance measurement values are considered to be substantially equal has substantially the same shape as the projected image when facing directly with little distortion.

  Next, the operation of the position adjustment apparatus of this embodiment will be described. Here, it is assumed that a conventional projector is installed on the apparatus main body 110.

  FIG. 11 is a schematic diagram showing that a conventional projector is installed on the apparatus main body 110. When the projector is installed on the apparatus main body 110, the apparatus main body 110 executes the operations from Step 1001 to Step 1005 shown in FIG.

  The position adjustment apparatus of the present embodiment can make a conventional projector face the projection surface without adjustment by the operator himself. For example, if a projector is installed on the apparatus main body 110, the projector can be directly opposed to the projection surface without adjustment by the operator.

  In the second embodiment, the rotating part may not be the apparatus main body 110, but only the position adjustment base for mounting a projector or a projector.

  In the second embodiment, the gear 20 may use a rubber ring such as a tire instead of providing teeth on the periphery. In this case, if the rotation path is provided in the device 110, the installation surface of the device is flat, and the rubber has a sufficient friction coefficient so that the rubber does not slip, the pedestal 2 becomes unnecessary. Similarly, in the first embodiment, a rubber ring may be used instead of the gear 20.

  In the embodiment described above, the bottom surface portion is in the horizontal direction, and the two distance measuring sensors have a line connecting them parallel to the bottom surface portion (the height from the bottom surface portion of the apparatus main body is the same). The case where each distance measuring sensor is provided at a position that is symmetric with respect to the optical axis of the projected image has been described. However, even if the shape does not satisfy such a condition, the condition of the projector shape is taken into account. Thus, it is naturally possible to carry out the present invention, and the above conditions are not particularly limited.

FIG. 2 is a block diagram illustrating a configuration example of a projector according to the first embodiment. FIG. 3 is a schematic diagram illustrating an example of a distance measuring sensor according to the first embodiment. It is the schematic diagram which showed arrangement | positioning of the ranging sensor of the present Example 1. FIG. 2 shows the position on the projection surface side where the distance measurement sensor of the first embodiment performs distance measurement. FIG. 3 is a schematic diagram illustrating an example of connection between the projector main body and a pedestal according to the first embodiment. FIG. 6 is a schematic diagram for explaining a rotation operation of the projector main body according to the first embodiment. 6 is a flowchart illustrating an operation procedure of the projector according to the first embodiment. The information stored in the memory | storage part of the present Example 1 is graphed. It is a schematic diagram for demonstrating the focus distance of the present Example 1. FIG. It is a block diagram which shows the example of 1 structure of the position adjustment apparatus of the present Example 2. It is a schematic diagram which shows having arrange | positioned the projector to the position adjustment apparatus of the present Example 2. It is a schematic diagram for demonstrating a mirror projection system. It is the schematic diagram which the ultra-short focus projector projected. It is a schematic diagram in which the ultra-short focus projector faces the projection surface. It is a projection image when the ultra-short focus projector faces the projection surface. It is a schematic diagram in which the ultra-short focus projector does not face the projection surface. It is a projection image when the ultra-short focus projector is not directly facing the projection surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector body 2 Base 11 Operation part 12, 13 Distance sensor 14 Storage part 15 Control part 18 Motor control part 21 Projection mechanism 22 Focus adjustment part 201 Light emitting device 202 Image receiving device

Claims (13)

In a projector having a main body and a pedestal,
A projection mechanism provided in the main body and projecting an image on a projection surface;
A first and a second distance measuring sensors provided in the main body, further provided in the left-right direction across the projection mechanism, for measuring the distance to the projection surface;
A rotation mechanism that rotates the main body in the left-right direction around the rotation axis of the pedestal;
Based on the detection contents of the first and second distance measuring sensors, a first distance and a second distance that are distances from the first and second distance measuring sensors to the projection surface are calculated. , possess a control unit for the difference between the first and second distances issued the calculated controls the rotation mechanism so as to minimize, and
The first angle formed by the measurement direction of the first distance measurement sensor and the projection axis of the projection mechanism has a predetermined spread angle in the left-right direction, and the measurement direction of the second distance measurement sensor and the projection mechanism The second angle formed by the projection axis of the projector is symmetric with respect to the projection angle of the projection mechanism in the left-right direction with respect to the first angle . The projector according to claim 1, wherein
The projector according to claim 1, wherein the first and second ranging sensors are arranged symmetrically with respect to the optical axis of the projection mechanism, and a line connecting them is parallel to the bottom surface. The projector according to claim 1 or 2,
The rotation mechanism unit rotates the main body at a predetermined step angle in response to an input first control signal, and changes the image projection angle on the projection surface, thereby changing the first and second distances. Change
The control unit transmits the first control signal to the rotation mechanism unit, and each time the rotation mechanism unit rotates the main body by the step angle, the detection contents of the first and second ranging sensors are detected. The projector calculates the first distance and the second distance based on the rotation distance, and rotates the main body at a rotation angle at which a difference between these distances is minimized. The projector according to any one of claims 1 to 3,
A storage unit, and the control unit includes:
Each time the rotation mechanism unit rotates the main body, data indicating the rotation angle of the rotation mechanism unit and the first and second distances at the rotation angle are stored in the storage unit, and are shown in these data. A projector that searches for a rotation angle that minimizes a difference in distance from the data. The projector according to any one of claims 1 to 4,
The main body includes a focus adjustment unit that drives the projection mechanism according to an input second control signal to focus an image,
The controller is
An object to which an image is focused based on the first distance or the second distance at the rotation angle after the main body is rotated to a rotation angle at which the difference between the first and second distances is minimized. And a second control signal based on the distance is transmitted to the focus adjustment unit. In a position adjustment device comprising a position adjustment table on which an image projection device can be mounted, and a rotation shaft for rotating the position adjustment table,
First and second measurements are provided on the position adjustment table, and are provided in the left-right direction across the rotation axis to measure the distance from the image projection device to the projection surface on which the image is projected. A distance sensor;
A rotation mechanism that rotates the position adjustment table in the left-right direction around the rotation axis;
Based on the detection contents of the first and second distance measuring sensors, a first distance and a second distance that are distances from the first and second distance measuring sensors to the projection surface are calculated. , possess a control unit for the difference between the first and second distances issued the calculated controls the rotation mechanism so as to minimize, and
The first angle formed by the measurement direction of the first distance measurement sensor and the projection axis of the image projection device has a predetermined spread angle in the left-right direction, and the measurement direction of the second distance measurement sensor and the The first angle and the second angle formed by the projection axis of the image projection apparatus are symmetric with respect to the projection axis of the image projection apparatus. A position adjusting device in which two distance measuring sensors are arranged . The position adjusting device according to claim 6, wherein
The first and second distance measuring sensors are arranged symmetrically with respect to the rotation axis, and a line connecting them is parallel to the bottom surface of the image projection apparatus. The position adjusting device according to claim 6 or 7,
The rotation mechanism unit rotates the position adjusting table at a predetermined step angle in accordance with the input first control signal, and changes the image projection angle onto the projection surface, whereby the first and second Change the distance,
The control unit transmits the first control signal to the rotation mechanism unit, and each time the rotation mechanism unit rotates the position adjustment table by the step angle, the detection of the first and second ranging sensors. A position adjustment device that calculates the first distance and the second distance based on content and rotates the position adjustment table to a rotation angle at which a difference between these distances is minimized. The position adjusting device according to any one of claims 6 to 8,
A storage unit, and the control unit includes:
Each time the rotation mechanism unit rotates the position adjustment table, the storage unit stores data indicating the rotation angle of the rotation mechanism unit and the first and second distances at the rotation angle. A position adjustment device that searches the data for a rotation angle that minimizes the difference in distance shown in FIG. A method for adjusting a position of a projector including a main body and a pedestal,
The main body is provided with a projection mechanism for projecting an image on the projection surface, and further, first and second distance measuring sensors for measuring the distance to the projection surface are arranged in the left-right direction across the projection mechanism. Provided,
A rotation mechanism for rotating the main body in the left-right direction around the rotation axis of the pedestal;
The first angle formed by the measurement direction of the first distance sensor and the projection axis of the projection mechanism has a predetermined spread angle in the left-right direction, and the measurement direction of the second distance sensor and the projection The second angle formed by the projection axis of the mechanism is symmetric with respect to the projection axis of the projection mechanism in the left-right direction with respect to the first angle. Place the distance sensor,
Based on the detection contents of the first and second distance measuring sensors, a first distance and a second distance that are distances from the first and second distance measuring sensors to the projection surface are calculated. A position adjustment method for controlling the rotation mechanism so that a difference between the calculated first distance and the second distance is minimized. The position adjustment method according to claim 10,
The position adjusting method, wherein the first and second distance measuring sensors are arranged symmetrically with respect to the optical axis of the projection mechanism, and a line connecting them is parallel to the bottom surface of the projector. The position adjustment method according to claim 10 or 11,
The rotation mechanism unit rotates the main body at a predetermined step angle in response to an input first control signal, and changes the image projection angle on the projection surface, thereby changing the first and second distances. Change
The first control signal is transmitted to the rotation mechanism unit, and the rotation mechanism unit rotates the main body by the step angle, based on the detection contents of the first and second ranging sensors. And the second distance, and the main body is rotated to a rotation angle at which the difference between these distances is minimized. The position adjustment method according to any one of claims 10 to 12,
Each time the main body rotates, the rotation angle and data indicating the first and second distances at the rotation angle are stored, and the rotation angle at which the difference between the distances indicated by these data is minimized is stored in the data. The position adjustment method characterized by searching from.

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