JP5105115B2 - Projector, projector control method, and projector control program - Google Patents

Description

  The present invention relates to a projector that projects an image on a screen, a projector control method, and a projector control program.

  There is a projector that projects an image on a screen for display. An image projected by the projector on the screen may be too large or too small, and the image may not be displayed on the screen in a size corresponding to the size of the screen.

  In such a case, the projector operator generally performs an operation of adjusting the focus distance of the projector, and tries to display an image on the screen in a size corresponding to the size of the screen.

  Patent Document 1 describes a projector that controls a zoom ratio of a zoom lens in accordance with an input screen size and a measured distance from the screen. Patent Document 2 describes a projector that detects the position of an electronic pen for drawing on a screen.

JP-A-11-95324 (paragraphs 0012 to 0017, FIG. 1) JP 2007-188511 (paragraphs 0010 to 0016, FIG. 1)

  When the projector operator adjusts the focus distance and the image is not displayed with a size corresponding to the size of the screen, the projector operator moves the projector closer to the screen or away from the screen, and displays it on the screen. There is a problem in that it takes time and effort to adjust the size of the image.

  Further, the projector described in Patent Document 1 has an incorrect screen size that is input when the operator does not know the size of the screen on which the image is projected, and the size corresponding to the size of the screen. The image may not be displayed. The projector described in Patent Document 2 cannot recognize the size of the screen, and there is a possibility that an image is not displayed with a size corresponding to the size of the screen.

  Therefore, an object of the present invention is to provide a projector, a projector control method, and a projector control program that can display an image with a size corresponding to the size of the screen.

  A projector according to the present invention is a projector that projects and displays an image on a screen, and includes a distance measuring unit that measures a distance from the screen, a screen size calculating unit that calculates the size of the screen, and a size of the screen. And a distance setting table that associates a preset distance for displaying an image on the screen with a size corresponding to the size of the screen, and the screen size calculated by the screen size calculation unit in the distance setting table The distance between the projector and the screen is set based on the calculation result of the movement distance calculation unit that calculates the difference between the set distance associated with the distance measured by the distance measurement unit. A moving unit for moving the projector to obtain a distance, and the screen size calculating unit emits infrared light. Of the reflected light reflected by the plurality of infrared reflecting members that are output from the light emitting unit that receives the infrared light, the light receiving unit that receives the infrared light, and the light emitting unit that is input by the plurality of light receiving units. A calculation unit that calculates the size of the screen based on the corner and the measurement result of the distance measurement unit is included.

  A projector control method according to the present invention is a projector control method for controlling a projector that projects an image on a screen, and measures the distance between the projector and the screen, and outputs the infrared light reflected on the screen. The size of the screen is calculated based on the incident angle of the reflected light reflected by the member and the measurement result of the distance between the projector and the screen, and the screen is sized according to the screen size and the screen size. In a distance setting table registered in association with preset distances for displaying images on the screen, the distance between the set distance associated with the calculated screen size and the measured screen The distance between the projector and the screen is calculated based on the calculation result. And wherein the moving the projector to a constant distance.

  A projector control program according to the present invention is a projector control program installed in a projector that projects and displays an image on a screen, and the timing at which an ultrasonic wave is output to a computer and the timing at which an ultrasonic wave reflected by the screen is received. Based on the above, a distance measurement process for measuring the distance to the screen, a screen size calculation process for calculating the screen size, and an image on the screen with a size corresponding to the screen size and the screen size. In the distance setting table registered in association with the preset distance set for display, the set distance associated with the screen size calculated by the screen size calculation process and the distance measurement process A moving distance calculation process for calculating a difference from the measured distance; Based on the calculation result of the moving distance calculation process, in order to set the distance between the projector and the screen to the set distance, the moving unit is instructed to move the projector, and the screen size calculation process The size of the screen is calculated based on the incident angle of the reflected light reflected by the infrared reflecting member installed on the screen and the measurement result of the distance measurement process.

  According to the present invention, it is possible to display an image with a size corresponding to the size of the screen by setting the distance between the screen and the projector to a distance set in advance according to the size of the screen.

It is explanatory drawing which shows the use condition of 1st Embodiment of the projector by this invention. It is a block diagram which shows the structural example of the projector of 1st Embodiment. It is explanatory drawing which shows the position of the reflective marker installed in the screen. It is a front view of a reflective marker. It is explanatory drawing which shows the image pattern by the infrared light which the infrared receiving block received. It is explanatory drawing which shows the example of the table previously memorize | stored in the memory part. It is a flowchart which shows operation | movement of the projector of 1st Embodiment. It is explanatory drawing which shows the method of calculating the position of a reflective marker. It is explanatory drawing which shows the method of calculating the position of a reflective marker based on the information which shows the image pattern which the infrared rays light-receiving part output, and the information which shows an incident angle. It is a block diagram which shows the structural example of the projector of 2nd Embodiment. It is a block diagram which shows the outline | summary of this invention.

Embodiment 1. FIG.
A projector according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a usage state of the projector according to the first embodiment of the invention.

  As shown in FIG. 1, the projector 1 according to the present embodiment projects an image on a screen 2 on which reflection markers 3 a to d (reflection markers 3 c and d are not shown in FIG. 1) are installed.

  FIG. 2 is a block diagram illustrating a configuration example of the projector 1 according to the first embodiment. As shown in FIG. 2, the projector 1 according to the first embodiment includes an ultrasonic transmission unit 102, an ultrasonic reception block 10, an infrared light emission unit 110, an infrared reception block 20, a position calculation unit 113, a memory unit 114, and a movement block. 30 and a microcomputer 101 (hereinafter referred to as a microcomputer). The microcomputer 101 is connected to a projection optical unit 115 that projects an image on the screen 2.

  The ultrasonic transmission unit 102 outputs an ultrasonic wave. The ultrasonic reception block 10 receives ultrasonic waves. Therefore, the ultrasonic wave output from the ultrasonic transmitter 102 and reflected by the screen 2 is received by the ultrasonic receiving block 10. The infrared light emitting unit 110 outputs infrared light. The infrared light receiving block 20 receives infrared light. Accordingly, the infrared light output from the infrared light emitting unit 110 and reflected by the reflection markers 3 a to 3 d installed on the screen 2 is received by the infrared light receiving block 20. Based on the infrared light received by the infrared light receiving block 20, the position calculation unit 113 outputs information corresponding to the position where the reflection markers 3 a to 3 d on the screen 2 are installed to the microcomputer 101.

  The memory unit 114 stores in advance a table that associates the size of the screen 2 with a projection distance set in advance for displaying an image on the screen 2 with a size corresponding to the size of the screen 2. The moving block 30 moves the projector 1 in a direction approaching the screen 2 or away from the screen 2. The microcomputer 101 controls each part.

  As illustrated in FIG. 2, the ultrasonic reception block 10 includes an ultrasonic reception unit 103, an amplification unit 104, a smoothing unit 105, and a comparison unit 106.

  The ultrasonic receiving unit 103 receives ultrasonic waves and converts them into electric signals, and outputs the converted electric signals to the amplifying unit 104. The amplifying unit 104 amplifies the electrical signal output from the ultrasonic receiving unit 103 and outputs the amplified electrical signal to the smoothing unit 105. The smoothing unit 105 applies a DC voltage obtained by smoothing the electrical signal output from the amplification unit 104 to the comparison unit 106. The comparison unit 106 compares the DC voltage value output from the amplification unit 104 with a preset value, and applies a voltage corresponding to the comparison result to the connection terminal of the microcomputer 101.

  As shown in FIG. 2, the infrared light receiving block 20 includes infrared light receiving portions 111 and 112. The infrared light receivers 111 and 112 output information indicating an image pattern corresponding to the received infrared light and information indicating an incident angle of the infrared light to the position calculator 113.

  As shown in FIG. 2, the moving block 30 includes a control unit 107, a drive unit 108, a motor 109, and wheels 4.

  The control unit 107 calculates the movement amount of the projector 1 based on the data output from the microcomputer 101, and outputs information indicating the calculated movement amount and a control signal to the driving unit 108. The drive unit 108 applies a drive voltage corresponding to the information indicating the movement amount output from the control unit 107 and the control signal to the motor 109. The motor 109 rotates the shaft according to the drive voltage applied by the drive unit 108, and rotates the wheel 4 installed on the shaft in the circumferential direction. The projector 1 moves according to the rotation of the wheels 4.

  In the example shown in FIG. 2, the wheel 4 is installed at a location (front part) near the end of the projection optical unit 115 in the image projection direction at the bottom of the projector 1. Further, the wheel 5 is installed at a location (rear part) near the end of the projection optical unit 115 in the direction opposite to the image projection direction at the bottom of the projector 1. The wheel 5 supports the rear portion of the projector 1 and rotates according to the movement of the projector 1. The wheel 5 may be spherical.

  FIG. 3 is an explanatory diagram showing the positions of the reflective markers 3 a to d installed on the screen 2. As shown in FIG. 3, the reflective marker 3a is installed at the upper right end of the screen 2, the reflective marker 3b is installed at the lower right end of the screen 2, the reflective marker 3c is installed at the upper left end of the screen 2, and the reflective marker 3d is It is installed at the lower left end of the screen 2.

  FIG. 4 is an explanatory diagram showing a surface (front) facing the infrared light emitting unit 110 in the reflection markers 3a to 3d. In FIGS. 4A to 4D, a region shown in white is a region that reflects infrared light. Specifically, for example, a coating material that reflects infrared light is applied to a region shown in white in FIGS. FIG. 4A is a front view of the reflective marker 3a. FIG. 4B is a front view of the reflective marker 3b. FIG. 4C is a front view of the reflective marker 3c. FIG. 4D is a front view of the reflective marker 3d. As shown in FIGS. 4A to 4D, the configuration of the reflection markers 3a to 3d is different, and the area of the region that reflects infrared light is different.

  FIG. 5 is an explanatory diagram showing an image pattern by infrared light received by the infrared light receiving block 20. The infrared light receiving block 20 receives the infrared light output by the infrared light emitting unit 110 and reflected by the reflection markers 3a to 3d. As illustrated in FIG. 4, the areas of the reflective markers 3a to 3d that reflect the infrared light are different from each other. Therefore, the image pattern of the infrared light received by the infrared light receiving block 20 reflects the infrared light. It depends on the reflection marker.

  Fig.5 (a) is explanatory drawing which shows the image pattern by the infrared light reflected by the reflective marker 3a. FIG. 5B is an explanatory diagram showing an image pattern by infrared light reflected by the reflective marker 3b. FIG. 5C is an explanatory diagram showing an image pattern by infrared light reflected by the reflective marker 3c. FIG. 5D is an explanatory diagram showing an image pattern of infrared light reflected by the reflective marker 3d.

  The position calculation unit 113 identifies the image pattern of the infrared light received by the infrared light receiving block 20, calculates the positions of the reflection markers 3 a to d, and outputs the calculation results to the microcomputer 101.

  FIG. 6 is an explanatory diagram illustrating an example of a table stored in advance in the memory unit 114. In the example shown in FIG. 6, the table is registered in association with the size of each type of screen and a projection distance set in advance to display an image on the screen in a size corresponding to the size of the screen. Has been. The microcomputer 101 calculates the size of the screen 2 based on the calculation result of the position calculation unit 113, and reads the projection distance associated with the calculated size in the table shown in FIG.

  Next, the operation of the projector according to the present embodiment will be described with reference to the drawings. FIG. 7 is a flowchart showing the operation of the projector according to the present embodiment.

  The microcomputer 101 of the projector 1 changes the voltage of the terminal to which the ultrasonic transmission unit 102 is connected. Specifically, for example, the voltage of the terminal to which the ultrasonic transmission unit 102 is connected is alternately changed between a high level of CMOS (Complementary Metal Oxide Semiconductor) level and a low level at a frequency of 40 kHz.

  The ultrasonic transmission unit 102 outputs an ultrasonic wave corresponding to a change in the voltage at the terminal of the microcomputer 101. Specifically, for example, the piezoelectric ceramic vibrates according to a change in the voltage at the terminal of the microcomputer 101 and outputs an ultrasonic wave. The ultrasonic waves output from the ultrasonic transmission unit 102 are reflected by the screen 2.

  The ultrasonic receiving unit 103 receives ultrasonic waves and converts them into electric signals, and outputs the converted electric signals to the amplifying unit 104. The amplifying unit 104 amplifies the electrical signal output from the ultrasonic receiving unit 103 and outputs the amplified electrical signal to the smoothing unit 105. The smoothing unit 105 outputs a DC voltage obtained by smoothing the electrical signal output from the amplification unit 104 to the comparison unit 106. The comparison unit 106 compares the value of the DC voltage output from the amplification unit 104 with a preset value, and inputs a voltage according to the comparison result to the microcomputer 101.

  Specifically, the comparison unit 106 applies, for example, a high level voltage at the CMOS level to the connection terminal of the microcomputer 101 when the value of the DC voltage output from the amplification unit 104 is smaller than a preset value. When the value of the DC voltage output from the amplifying unit 104 is larger than a preset value, a low level voltage at the CMOS level is applied to the connection terminal of the microcomputer 101. Therefore, when the ultrasonic receiving unit 103 receives the ultrasonic wave output from the ultrasonic transmitting unit 102 and reflected by the screen 2, a low level voltage is applied to the connection terminal of the microcomputer 101.

  The microcomputer 101 starts the change in the voltage of the terminal to which the ultrasonic transmission unit 102 is connected, and changes the time from when the applied voltage to the terminal to which the comparison unit 106 is connected to low level, The distance between the projector 1 and the screen 2 is calculated based on the fact that the propagation speed is about 340 m per second (step S101). The microcomputer 101 stores distance information indicating the calculated distance in a storage unit (not shown).

  Further, the microcomputer 101 changes the output voltage of the terminal to which the infrared light emitting unit 110 is connected to a high level at the CMOS level for a predetermined time. The infrared light emitting unit 110 outputs infrared light having a wavelength of about 1 mm and an intensity changing in a pulse shape. The infrared light output by the infrared light emitting unit 110 is reflected by the reflection markers 3a to 3d. The infrared light receivers 111 and 112 receive the infrared light output by the infrared light emitter 110 and reflected by the reflection markers 3a to 3d. The infrared light receivers 111 and 112 output information indicating the image pattern of the received infrared light and information indicating the incident angle of the infrared light to the position calculator 113.

  The position calculation unit 113 calculates the positions of the reflection markers 3a to 3d based on the information output from the infrared light receiving units 111 and 112 (step S102).

  A method by which the position calculation unit 113 calculates the positions of the reflection markers 3a to 3d will be described. FIG. 8 is an explanatory diagram showing a method of calculating the positions of the reflection markers 3a to 3d.

  As shown in FIG. 8A, the position calculation unit 113 calculates the position of the reflective marker based on the information indicating the image pattern output from the infrared light receiving units 111 and 112 and the information indicating the incident angle.

  FIG. 9 is an explanatory diagram illustrating a method of calculating the position of the reflective marker based on information indicating the image pattern output from the infrared light receiving units 111 and 112 and information indicating the incident angle.

  The infrared light receivers 111 and 112 measure the incident angles of the received infrared light. In the side view illustrated in FIG. 9A, the measurement result of the infrared light incident angle of the infrared light receiving unit 111 is α, and the measurement result of the infrared light incident angle of the infrared light receiving unit 112 is β.

  The infrared light receivers 111 and 112 input the incident infrared light image pattern and the measurement result of the incident angle of the infrared light to the position calculator 113, respectively. The position calculation unit 113 identifies a reflection marker as a position calculation target based on an infrared light image pattern, and the length of one side of a triangle that connects the reflection marker as a position calculation target and the infrared light receiving units 111 and 112 with straight lines. (The length y between the infrared receiving unit 111 and the infrared receiving unit 112 set in advance), two angles (the incident angle α of the infrared light of the infrared receiving unit 111, and the infrared receiving unit 112) Based on the incident angle β) of infrared light, a vertical distance that is the height of the position where the reflection marker to be position-calculated is installed on the screen 2 is calculated with respect to the infrared light receiving unit 111 or the infrared light receiving unit 112. .

  Further, the position calculation unit 113 calculates the distance between the infrared light receiving unit 111 or the infrared light receiving unit 112 and the reflection marker to be position calculated. Then, as shown in FIG. 9B, the calculated distance between the infrared light receiving unit 111 or the infrared light receiving unit 112 and the position calculation target reflection marker, the screen 2 and the projector 1 calculated in the process of step S101, A straight line perpendicular to the paper surface of FIG. 9B passing through the point P which is a position facing the infrared light receiving unit 111 or the infrared light receiving unit 112 on the screen 2 and a reflection marker for position calculation are based on the distance between The horizontal distance (the distance indicated by x in FIG. 9B), which is the shortest distance from the installed position, is calculated.

  Then, as shown in FIG. 8A, the position calculation unit 113 is a plane set in advance on the vertical plane according to the screen 2 based on the vertical distance and the horizontal distance calculated by the method illustrated in FIG. This is applied to the coordinate value of the position where the reflection marker for position calculation in the coordinate system is installed.

  As shown in FIG. 8B, the position calculation unit 113 calculates the position where each reflective marker is installed by the method illustrated in FIG. 9, and the calculated position is a coordinate in a preset plane coordinate system. Apply to value. Then, the position calculation unit 113 outputs information indicating each coordinate value corresponding to the position where each fitted reflection marker is installed to the microcomputer 101. The microcomputer 101 calculates the size of the screen 2 based on the coordinate values corresponding to the respective positions of the reflection markers 3a to 3d indicated by the information output by the position calculation unit 113 (step S103). Then, the microcomputer 101 reads out the projection distance associated with the calculated size in the table shown in FIG. 6 (step S104).

  The microcomputer 101 calculates the difference between the distance calculated in step S101 and the projection distance read from the table in step S104 (step S105). The microcomputer 101 outputs information indicating a movement amount according to the calculated difference and a control signal to the control unit 107.

  Specifically, for example, the microcomputer 101 determines that the distance between the information indicating the absolute value of the calculated difference and the control signal corresponding to the calculated sign of the difference (that is, the screen 2 calculated in the process of step S101). Based on whether or not the projection distance read from the table in step S104 is longer or shorter, the signal depends on whether the projector 1 is moved in the direction approaching the screen 2 or in the direction away from the screen 2) Are output to the control unit 107.

  The drive unit 108 applies a drive voltage corresponding to the information indicating the movement amount output from the control unit 107 and the control signal to the motor 109. Specifically, for example, when the motor 109 is a stepping motor, the driving unit 108 applies to the motor 109 a pulse voltage corresponding to information indicating the movement amount output from the control unit 107 and a control signal. The motor 109 rotates the shaft according to the drive voltage applied by the drive unit 108, and rotates the wheel 4 installed on the shaft in the circumferential direction. The projector 1 moves according to the rotation of the wheel 4 (step S106).

  The projection optical unit 115 projects an image on the screen 2 from the position moved in the process of step S106 according to the operation of the operator (step S107).

  According to the present embodiment, the size of the screen 2 is calculated based on the infrared light output from the infrared light emitting unit 110 of the projector 1 and reflected by the reflection markers 3a to 3d and received by the infrared receiving block 20. be able to. Further, according to the present embodiment, the distance between the projector 1 and the screen 2 is determined based on the ultrasonic wave output from the ultrasonic transmitter 102 and reflected by the screen 2 and received by the ultrasonic receiver 103. Can be calculated.

  According to the present embodiment, the projector 1 includes the moving block 30 that moves the projector 1 according to the distance from the screen 2 and the size of the screen 2. An image can be displayed on the screen 2 with a corresponding size. Therefore, the operator of the projector 1 can save time and effort to adjust the size of the image displayed on the screen 2 by moving the projector 1 closer to the screen 2 or away from the screen 2.

Embodiment 2. FIG.
A projector according to a second embodiment of the invention will be described with reference to the drawings. FIG. 10 is a block diagram showing a configuration example of the second embodiment of the projector according to the present invention.

  As shown in FIG. 10, the projector 40 of this embodiment includes a distance measuring sensor unit 120, a level comparison unit 121, and a temperature sensor unit 122 in addition to the configuration of the projector 1 of the first embodiment shown in FIG. Including. Since the other components are the same as those of the projector 1 of the first embodiment shown in FIG. 2, the same reference numerals as those in FIG.

  The distance measuring sensor unit 120 is installed at, for example, a front end and a rear end, which are ends in the direction in which the projector 40 is moved, and an ultrasonic transmission unit and an ultrasonic that output ultrasonic waves below the direction in which the projector 40 is moved. Ultrasonic wave receiving means for receiving sound waves is included.

  The distance measuring sensor unit 120, for example, when the projector 40 is placed on the upper surface (mounting surface) of a table or a desk, the timing at which the ultrasonic transmission means outputs the ultrasonic wave, and the ultrasonic transmission The distance from the placement surface is measured based on the timing at which the ultrasonic wave reception means receives the ultrasonic wave output from the means and reflected by the placement surface. The distance measuring sensor unit 120 applies a DC voltage corresponding to the measured distance to the mounting surface to the level comparing unit 121. The level comparison unit 121 compares the value of the applied DC voltage with a preset threshold value, and applies a positive voltage or a negative voltage to the connection terminal of the microcomputer 101 according to the comparison result.

  When the projector 40 moves and approaches the end of the placement surface, the distance measuring sensor unit 120 measures a distance from an object or a floor surface farther than the placement surface. The distance measuring sensor 120 applies a high DC voltage to the level comparison unit 121 because the measured distance has become longer. The level comparison unit 121 changes the input voltage of the microcomputer 101, which is a positive voltage or a negative voltage, to a negative voltage or a positive voltage when the value of the applied DC voltage exceeds a preset threshold value. Invert the input voltage.

  The microcomputer 101 outputs a stop signal to the control unit 106 when the input voltage is inverted. The control unit 106 outputs a stop signal to the drive unit 108. The drive unit 108 stops applying the drive voltage of the motor 109 in accordance with the stop signal output from the control unit 106. Then, the motor 109 stops the rotation of the shaft, and the movement of the projector 40 is stopped. Therefore, the projector 40 can be prevented from falling from the end portion of the placement surface. This is particularly effective when the area of the mounting surface is small.

  The temperature sensor unit 122 detects the temperature and outputs temperature information indicating the detected temperature to the microcomputer 101. The microcomputer 101 starts the change of the temperature indicated by the temperature information output from the temperature sensor unit 122 and the voltage of the terminal to which the ultrasonic transmission unit 102 is connected, and then the terminal of the terminal to which the comparison unit 106 is connected. The distance between the projector 40 and the screen 2 is calculated based on the time until the input voltage changes to the low level.

  Specifically, the microcomputer 101 converts analog data indicating the temperature output from the temperature sensor unit 122 connected to the analog port into digital data. Then, the microcomputer 101 calculates the ultrasonic wave propagation velocity [m / s] by the calculation formula 331.5 + 0.6 × t based on the temperature indicated by the converted digital data (t: temperature [° C.]). ). That is, the microcomputer 101 calculates the ultrasonic wave propagation velocity corrected according to the temperature measured by the temperature sensor unit 122. The microcomputer 101 starts changing the calculated ultrasonic propagation velocity and the voltage of the terminal to which the ultrasonic transmission unit 102 is connected, and then the input voltage of the terminal to which the comparison unit 106 is connected changes to a low level. The distance between the projector 40 and the screen 2 is calculated on the basis of the time until. Then, the distance between the projector 40 and the screen 2 can be calculated more accurately.

  According to the present embodiment, since the operation of the motor 109 is stopped according to the measurement result of the distance measuring sensor unit 120, the projector 40 can be prevented from falling from the placement surface. Further, according to the present embodiment, since the distance between the projector 40 and the screen 2 is calculated based on the measurement result of the temperature sensor unit 122, the distance between the projector 40 and the screen 2 is calculated more accurately. The image can be displayed in a size more suitable for the size of the screen 2.

  Next, the outline of the present invention will be described. FIG. 11 is a block diagram showing an outline of the present invention. As shown in FIG. 11, a projector 200 according to the present invention (corresponding to the projector 1 shown in FIGS. 1 and 2) includes a distance measuring unit 201 (the ultrasonic transmission unit 102, the ultrasonic reception block 10 shown in FIG. 2, and a microcomputer). 101), a screen size calculation unit 202 (corresponding to the infrared light emitting unit 110, infrared receiving block 20, position calculating unit 113, and microcomputer 101 shown in FIG. 2), a distance setting table 203 (in the memory unit 114 shown in FIG. 2). Equivalent), a moving distance calculating unit 204 (corresponding to the microcomputer 101 shown in FIG. 2), and a moving unit 205 (corresponding to the moving block 30 shown in FIG. 2).

  The distance measuring unit 201 measures a distance from the screen 300 (corresponding to the screen 2 shown in FIGS. 1 and 2). The screen size calculation unit 202 calculates the size of the screen 300. The distance setting table 203 associates the size of the screen 300 with a set distance set in advance for displaying an image on the screen 300 with a size corresponding to the size of the screen 300. The movement distance calculation unit 204 calculates a difference between the setting distance associated with the size of the screen 300 calculated by the screen size calculation unit 202 and the distance measured by the distance measurement unit 201 in the distance setting table 203. The moving unit 205 moves the projector 200 so that the distance between the projector 200 and the screen 300 becomes a set distance based on the calculation result of the moving distance calculator 202.

  The screen size calculation unit 202 includes a light emitting unit 206 that outputs infrared light (corresponding to the infrared light emitting unit 110 shown in FIG. 1), and a plurality of light receiving units 207 that input infrared light (infrared light receiving units 111, 111 shown in FIG. 112 and a plurality of infrared reflecting members (equivalent to the reflecting markers 3a to 3d shown in FIGS. 1, 2 and 3) which are output by the light emitting units respectively input by the light receiving units 207 and installed on the screen 300. ) Includes a calculation unit 208 that calculates the size of the screen 300 based on the incident angle of the reflected light and the measurement result of the distance measurement unit 201.

  According to such a configuration, an image can be displayed on the screen 300 in a size corresponding to the size of the screen 300 by setting the distance between the screen 300 and the projector 200 to a preset distance.

  In the above embodiment, projectors as shown in the following (1) to (3) are also disclosed.

(1) The distance measurement unit 201 outputs an ultrasonic wave (equivalent to the ultrasonic wave transmission unit 102 shown in FIG. 2), and an ultrasonic wave reception unit (receives the ultrasonic wave shown in FIG. 2). And the ultrasonic output unit outputs an ultrasonic wave, and the ultrasonic output unit outputs an ultrasonic wave reflected by the screen 300 and received by the ultrasonic receiver unit. A projector that measures the distance to the screen 300. In the case of such a configuration, the distance between the projector 200 and the screen 300 can be easily measured.

(2) A temperature measuring unit (corresponding to the temperature sensor unit 122 shown in FIG. 10) that measures temperature is provided, and the distance measuring unit 201 is based on the ultrasonic wave propagation velocity corrected according to the temperature measured by the temperature measuring unit. A projector that measures the distance to the screen 300. In the case of such a configuration, the distance between the projector 200 and the screen 300 can be measured more accurately.

(3) An end detection unit that detects that there is an end of the placement surface on which the projector is placed in the direction in which the projector 200 is moved by the moving unit 205 in the vicinity of the projector 200 (FIG. 10). And a movement control unit (microcomputer 101 shown in FIG. 10) that performs control to stop the movement by the moving unit 205 in accordance with the detection result of the end detection unit. Equivalent to the projector). In the case of such a configuration, it is possible to prevent the projector 200 from moving and dropping from the placement surface.

  The present invention can be applied to a projector that projects an image on a screen.

DESCRIPTION OF SYMBOLS 1, 40, 200 Projector 2,300 Screen 3a-d Reflective marker 4, 5 Wheel 10 Ultrasonic receiving block 20 Infrared receiving block 30 Moving block 101 Microcomputer 102 Ultrasonic transmitting part 103 Ultrasonic receiving part 104 Amplifying part 105 Smoothing part 106 Comparison unit 107 Control unit 108 Drive unit 109 Motor 110 Infrared light emitting unit 111, 112 Infrared light receiving unit 113 Position calculation unit 114 Memory unit 115 Projection optical unit 120 Distance sensor unit 121 Level comparison unit 122 Temperature sensor unit 201 Distance measurement unit 202 Screen Size calculation unit 203 Distance setting table 204 Movement distance calculation unit 205 Movement unit 206 Light emitting unit 207 Light receiving unit 209 Calculation unit

Claims (8)

A projector for projecting and displaying an image on a screen,
A distance measuring unit for measuring a distance between the screens;
A screen size calculator for calculating the size of the screen;
A distance setting table associating the size of the screen with a preset distance for displaying an image on the screen with a size corresponding to the size of the screen;
In the distance setting table, a moving distance calculating unit that calculates a difference between a setting distance associated with the screen size calculated by the screen size calculating unit and a distance measured by the distance measuring unit;
Based on the calculation result of the moving distance calculating unit, a moving unit that moves the own projector to set the distance between the projector and the screen to the set distance,
The screen size calculation unit is output by the light emitting unit that outputs infrared light, the plurality of light receiving units that input infrared light, and the light emitting unit that receives the plurality of light receiving units, and is installed on the screen. And a calculating unit that calculates the size of the screen based on the incident angles of the reflected light respectively reflected by the plurality of infrared reflecting members and the measurement result of the distance measuring unit. The distance measuring unit includes an ultrasonic output unit that outputs ultrasonic waves, and an ultrasonic receiving unit that receives ultrasonic waves,
Based on the timing at which the ultrasonic wave output unit outputs ultrasonic waves and the timing at which the ultrasonic wave reception unit receives ultrasonic waves output from the ultrasonic wave output unit and reflected by the screen, The projector according to claim 1, wherein the distance is measured. It has a temperature measurement unit that measures temperature,
The projector according to claim 2, wherein the distance measuring unit measures the distance to the screen based on the propagation speed of the ultrasonic wave corrected according to the temperature measured by the temperature measuring unit. An end detection unit that detects that there is an end of the mounting surface on which the projector is mounted in a direction in which the projector is moved by the moving unit in the vicinity of the projector;
The projector according to claim 1, further comprising: a movement control unit that performs control to stop movement by the moving unit according to a detection result of the end detection unit. A projector control method for controlling a projector that projects an image on a screen,
Measuring the distance between the projector and the screen;
The size of the screen is calculated based on the incident angle of the reflected light reflected by the infrared reflecting member installed on the screen and the measurement result of the distance between the projector and the screen. And
The calculated screen in a distance setting table in which the size of the screen and a preset setting distance for displaying an image on the screen with a size corresponding to the size of the screen are registered in association with each other. The difference between the set distance associated with the size of the screen and the measured distance to the screen,
A projector control method comprising: moving the projector so that a distance between the projector and the screen becomes the set distance based on a calculation result. Output ultrasound,
Receiving the ultrasound reflected on the screen;
The projector control method according to claim 5, wherein a distance from the screen is measured based on a timing at which an ultrasonic wave is output and a timing at which an ultrasonic wave reflected by the screen is received. A projector control program installed in a projector that projects and displays an image on a screen,
On the computer,
A distance measurement process for measuring the distance between the screen and the timing based on the timing at which the ultrasound is output and the timing at which the ultrasound reflected by the screen is received;
Screen size calculation processing for calculating the size of the screen;
In the distance setting table in which the screen size and a preset setting distance for displaying an image on the screen with a size corresponding to the screen size are registered in association with each other, the screen size calculation A moving distance calculating process for calculating a difference between a set distance associated with the size of the screen calculated in the process and a distance measured in the distance measuring process;
Based on the calculation result of the movement distance calculation process, a movement process for instructing a movement unit to move the projector is performed in order to set the distance between the projector and the screen to the set distance.
In the screen size calculation process, the size of the screen is determined based on the incident angle of the reflected light reflected by the infrared reflecting member installed on the screen and the measurement result of the distance measurement process. Projector control program for calculation. On the computer,
The projector control program according to claim 7, wherein, in the distance measurement process, the distance to the screen is measured based on the propagation speed of the ultrasonic wave corrected according to the temperature measured by the temperature measurement unit that measures the temperature.

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