JP6287432B2 - OPERATION DEVICE, POSITION DETECTION SYSTEM, AND OPERATION DEVICE CONTROL METHOD - Google Patents

Description

  The present invention relates to an operation device, a position detection system, and a method for controlling the operation device.

  2. Description of the Related Art Conventionally, there has been known a system that enables an operation of instructing a position using a pen-type operation device on a projection surface on which an image is projected by a projector (see, for example, Patent Document 1).

JP 2012-173447 A

Some operation devices include an infrared light receiving unit that receives infrared light projected from a projector. A light receiving element such as a photodiode used in the infrared light receiving unit receives infrared light and outputs a current, but there is a solid difference in reaction time until the current is output. This reaction time also varies depending on temperature, aging, and the like. For this reason, it is desirable to periodically check the operating characteristics of the light receiving element, recognize the reaction time, and perform an operation according to the reaction time.
The present invention has been made in view of the above circumstances, and an operation device, a position detection system, and an operation device control method capable of suppressing deterioration in operability in response to operation characteristics due to light reception. The purpose is to provide.

In order to achieve the above object, the present invention is an operating device that includes a light emitting unit and a light receiving unit, and causes the light emitting unit to emit light in response to light received by the light receiving unit during normal operation, and has a predetermined condition. A control unit configured to detect an operation characteristic of the light receiving unit using the light emitting unit when established, and to control light emission of the light emitting unit during the normal operation based on a detection result; To do.
According to the configuration of the present invention, the operating characteristic of the light receiving unit is detected using the light emitted from the light emitting unit, and the light of the light emitting unit is controlled based on the detection result. Therefore, when light is received by the light receiving unit and the light emitting unit is caused to emit light, the influence of the operating characteristics of the light receiving unit can be reduced. For this reason, the fall of operativity can be suppressed corresponding to the operation characteristic by light reception.

Further, in the operation device, when the predetermined condition is satisfied, the control unit measures a time from when the light emitting unit emits light until the light receiving unit detects light reception, The light emission timing of the light emitting unit during the normal operation is controlled based on the measured time.
According to the configuration of the present invention, even if there is a time lag until the light receiving unit detects light reception, the light emitting unit can emit light at a timing at which the influence of the operating characteristics of the light receiving unit is reduced.

Further, the present invention is characterized in that, in the operation device, the control unit detects an operation characteristic of the light receiving unit when the light receiving unit has not received light for a predetermined time as the predetermined condition. And
According to the configuration of the present invention, it is possible to detect the operating characteristics of the light receiving unit at a timing when the light receiving unit is not receiving light.

In the operation device, the control unit may detect the operation characteristic of the light receiving unit when the control unit does not detect an operation of an operation element included in the operation device as the predetermined condition. It is characterized by.
According to the configuration of the present invention, it is possible to detect the operation characteristic of the light receiving unit at a timing when the operation device is not operated.

According to the present invention, in the operation device, the control unit detects the operation characteristic of the light receiving unit and reduces the power consumption of the operation device when the predetermined condition is satisfied. It shifts to electric power mode, It is characterized by the above-mentioned.
According to the configuration of the present invention, when the operating device is not operated, the operation mode of the operating device can be shifted to the power saving mode.

Further, the present invention provides the operation device, wherein the control unit includes, as the predetermined condition, a case where a battery is inserted into the operation device and an attitude detection sensor that detects an attitude of the operation device, and the operation device. The operation characteristic of the light receiving unit is detected at least in one of the cases where it is detected that there is no change in the posture for a certain period of time.
According to the configuration of the present invention, it is possible to detect the operation characteristic of the light receiving unit at a timing when the operation device is not operated.

The present invention also includes a light emitting unit and a light receiving unit, and an operation device that emits light from the light emitting unit in response to light received by the light receiving unit during normal operation, and light emitted from the light emitting unit of the operation device. A position detection system that receives light and detects a position of the operation device, wherein the operation device uses the light-emitting unit when a predetermined condition is satisfied. And a control unit that controls light emission of the light emitting unit during the normal operation based on a detection result.
According to the configuration of the present invention, the operating characteristic of the light receiving unit is detected using light emitted from the light emitting unit. Further, the light emission of the light emitting unit is controlled based on the detection result. Therefore, when light is received by the light receiving unit and the light emitting unit is caused to emit light, the influence of the operating characteristics of the light receiving unit can be reduced. For this reason, the fall of operativity can be suppressed corresponding to the operation characteristic by light reception.

In the position detection system according to the present invention, the position detection device may include a device light emitting unit that projects light on the operation device, and the control unit may be configured so that the position detection device is in the normal operation. Control is performed to cause the light emitting unit to emit light in synchronization with the timing at which the projected light is received by the light receiving unit, and the synchronization timing is corrected based on the detection result of the operating characteristics of the light receiving unit. To do.
According to the configuration of the present invention, it is possible to reduce the influence due to the operating characteristics of the light receiving unit, and to cause the light emitting unit to emit light in synchronization with the timing of receiving the light projected by the position detection device. Accordingly, it is possible to suppress a decrease in operability of the operation device.

Further, the present invention provides the position detection system, wherein the position detection device notifies the operation device of timing for causing the operation device to detect the operation characteristic of the light receiving unit, and the control unit includes: As the predetermined condition, an operation characteristic of the light receiving unit is detected at a timing notified from the position detection device.
According to the configuration of the present invention, the operation characteristic of the light receiving unit can be detected by the operation device in accordance with an instruction from the position detection device.

The operation device control method of the present invention is a control method for an operation device that includes a light emitting unit and a light receiving unit, and that causes the light emitting unit to emit light in response to light received by the light receiving unit during normal operation. When the above condition is satisfied, the step of detecting the operating characteristic of the light receiving unit using the light emitting unit and the light emission of the light emitting unit during the normal operation are controlled based on the detected operating characteristic And a step.
According to the configuration of the present invention, the operating characteristic of the light receiving unit is detected using light emitted from the light emitting unit. Further, the light emission of the light emitting unit is controlled based on the detection result. Therefore, when light is received by the light receiving unit and the light emitting unit is caused to emit light, the influence of the operating characteristics of the light receiving unit can be reduced. For this reason, the fall of operativity can be suppressed corresponding to the operation characteristic by light reception.

  According to the present invention, it is possible to suppress a decrease in operability corresponding to the operation characteristics due to the reception of light.

It is a figure showing a schematic structure of a position detection system concerning an embodiment. It is a functional block diagram of a position detection system. It is a figure which shows schematic structure of a pointer. It is a flowchart which shows the 1st process sequence of the microcomputer with which an indicator is provided. It is a flowchart which shows the procedure of the detection process of an operating characteristic. It is a flowchart which shows the process sequence of the microcomputer after power saving mode transfer. It is a flowchart which shows the 2nd process sequence of the microcomputer with which an indicator is provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a projection system 1 according to an embodiment to which the present invention is applied. The projection system 1 includes a projector 10 installed above the screen SC and a light emitting device 60 installed above the screen SC.

  The projector 10 is installed directly above or obliquely above the screen SC and projects an image toward the screen SC obliquely below. Further, the screen SC exemplified in the present embodiment is a flat plate or a curtain fixed to a wall surface or standing on a floor surface. The present invention is not limited to this example, and the wall surface can be used as the screen SC. In this case, the projector 10 and the light emitting device 60 may be attached to the upper part of the wall surface used as the screen SC.

The projector 10 is connected to an external image supply device such as a PC (personal computer), a video reproduction device, a DVD reproduction device, etc., and an image is displayed on the screen SC based on an analog image signal or digital image data supplied from the image supply device. Project. The projector 10 may be configured to read out image data stored in a built-in storage unit 110 (FIG. 2) or an externally connected storage medium and display an image on the screen SC based on the image data.
The light emitting device 60 includes a light source unit 61 (FIG. 2) that is a solid light source, and diffuses (emits) light emitted from the light source unit 61 (infrared light in the present embodiment) along the screen SC. . The emission range of the light emitting device 60 is shown in FIG. The light emitting device 60 is installed above the upper end of the screen SC and emits light downward in the range of the angle θ, and this light forms a layer of light along the screen SC. In this embodiment, the angle θ reaches approximately 180 degrees, and a light layer is formed on almost the entire screen SC. The surface of the screen SC and the light layer are preferably close to each other. In this embodiment, the distance between the surface of the screen SC and the light layer is approximately in the range of 10 mm to 1 mm.

The projection system 1 detects the indicated position by the projector 10 when an instruction operation is performed on the screen SC.
As an indicator used for the instruction operation, a pen-type indicator (operation device) 70 can be used. Since the distal end portion 71 of the indicator 70 incorporates an operation switch 711 (operator, FIG. 3) that operates when pressed, the operation switch is operated when the distal end portion 71 is pressed against the wall or the screen SC. 711 turns on. The indicator 70 is operated so that the user holds the rod-shaped shaft portion 72 in his / her hand and brings the tip portion 71 into contact with the screen SC, and an operation of pressing the tip portion 71 against the screen SC is also performed. The distal end portion 71 includes an infrared light emitting unit 712 that emits infrared light, and an infrared light receiving unit 713 (FIG. 3) that receives infrared light emitted from the projector 10. The projector 10 detects the position of the distal end portion 71 as the indication position based on the infrared light emitted from the indicator 70.

Further, when a position indicating operation is performed with the indicator 80 that is a user's finger, the user brings the finger into contact with the screen SC. In this case, the position where the indicator 80 contacts the screen SC is detected.
That is, when the tip (for example, fingertip) of the indicator 80 contacts the screen SC, the light layer formed by the light emitting device 60 is blocked. At this time, the light emitted from the light emitting device 60 strikes and reflects the indicator 80, and part of the reflected light travels from the indicator 80 toward the projector 10. Since the projector 10 has a function of detecting light from the screen SC side, that is, light from below by the position detection unit 50 described later, the reflected light of the indicator 80 can be detected. The projector 10 detects an instruction operation on the screen SC by the indicator 80 by detecting the reflected light reflected by the indicator 80. Further, the projector 10 detects the indicated position indicated by the indicator 80.
Since the light layer emitted from the light emitting device 60 is close to the screen SC, the position where the light is reflected by the indicator 80 can be regarded as the tip closest to the screen SC or the indication position. For this reason, the indicated position can be specified based on the reflected light of the indicator 80.

The projection system 1 functions as an interactive whiteboard system, detects an instruction operation performed by the operator using the indicators 70 and 80, and reflects the indicated position on the projection image.
Specifically, the projection system 1 performs a process of drawing a graphic or placing a character or a symbol at a designated position, a process of drawing a graphic along the locus of the designated position, a drawn figure, or a placed character or symbol. The process etc. which erases are performed. In addition, graphics drawn on the screen SC, arranged characters or symbols can be stored as image data, and can be output to an external device.
Further, it may operate as a pointing device by detecting the designated position, and output the coordinates of the designated position in the image projection area where the projector 10 projects an image on the screen SC. Further, a GUI (Graphical User Interface) operation may be performed using these coordinates.

FIG. 2 is a functional block diagram showing configurations of the projector 10 and the light emitting device 60.
The projector 10 includes an I / F (interface) unit 11 and an image I / F (interface) unit 12 as interfaces connected to external devices. The I / F unit 11 and the image I / F unit 12 may include a connector for wired connection, and may include an interface circuit corresponding to the connector. The I / F unit 11 and the image I / F unit 12 may include a wireless communication interface. Examples of the connector and interface circuit for wired connection include those based on wired LAN, IEEE 1394, USB, and the like. Examples of the wireless communication interface include those that comply with a wireless LAN, Bluetooth (registered trademark), or the like. For the image I / F unit 12, an interface for image data such as HDMI (registered trademark), DisplayPort (trademark), and CoaXPress (trademark) can be used. The image I / F unit 12 may include an interface through which audio data is input.

The I / F unit 11 is an interface that transmits and receives various data to and from an external device such as a PC. The I / F unit 11 inputs and outputs control data related to image projection, setting data for setting the operation of the projector 10, coordinate data of the designated position detected by the projector 10, and the like. The control unit 30 described later has a function of transmitting / receiving data to / from an external device via the I / F unit 11.
The image I / F unit 12 is an interface through which digital image data is input. The projector 10 of the present embodiment projects an image based on digital image data input via the image I / F unit 12. The projector 10 may have a function of projecting an image based on the analog image signal. In this case, the image I / F unit 12 converts the analog image signal into digital image data and an analog image interface. And an A / D conversion circuit.

The projector 10 includes a projection unit 20 that forms an optical image. The projection unit 20 includes a light source unit 21, a light modulation device 22, and a projection optical system 23. The light source unit 21 includes a light source including a xenon lamp, an ultra high pressure mercury lamp, an LED (Light Emitting Diode), a laser light source, or the like. The light source unit 21 may include a reflector and an auxiliary reflector that guide light emitted from the light source to the light modulation device 22. Further, a lens group (not shown) for enhancing the optical characteristics of the projection light, a polarizing plate, or a dimming element that reduces the amount of light emitted from the light source on the path to the light modulation device 22 may be provided. Good.
The light modulation device 22 includes, for example, three transmissive liquid crystal panels corresponding to the three primary colors of RGB, and generates image light by modulating light transmitted through the liquid crystal panel. The light from the light source unit 21 is separated into three color lights of RGB, and each color light enters each corresponding liquid crystal panel. The color light modulated by passing through each liquid crystal panel is combined by a combining optical system such as a cross dichroic prism and emitted to the projection optical system 23.

  The projection optical system 23 includes a lens group that guides the image light modulated by the light modulation device 22 toward the screen SC and forms an image on the screen SC. Further, the projection optical system 23 may include a zoom mechanism for enlarging / reducing the projected image on the screen SC and adjusting the focus, and a focus adjusting mechanism for adjusting the focus. When the projector 10 is a short focus type, the projection optical system 23 may include a concave mirror that reflects image light toward the screen SC.

  The projection unit 20 is connected to a light source drive unit 45 that turns on the light source unit 21 according to the control of the control unit 30 and a light modulation device drive unit 46 that operates the light modulation device 22 according to the control of the control unit 30. The light source drive unit 45 may have a function of switching on / off the light source unit 21 and adjusting the light amount of the light source unit 21.

  The projector 10 includes an image processing system that processes an image projected by the projection unit 20. The image processing system includes a control unit 30 that controls the projector 10, a storage unit 110, an operation detection unit 17, an image processing unit 40, a light source driving unit 45, and a light modulation device driving unit 46. In addition, a frame memory 44 is connected to the image processing unit 40, and an attitude sensor 47, an emission device driving unit 48, and a position detection unit 50 are connected to the control unit 30. These units may be included in the image processing system.

  The control unit 30 controls each unit of the projector 10 by executing a predetermined control program 111. The storage unit 110 stores the control program 111 executed by the control unit 30 and the data processed by the control unit 30 in a nonvolatile manner. The storage unit 110 stores screen setting screen data 112 for setting the operation of the projector 10 and setting data 113 indicating the contents set using the setting screen data 112.

The operation detection unit 17 is connected to a remote control light receiving unit 18 and an operation panel 19 that function as an input device, and detects an operation via the remote control light reception unit 18 and the operation panel 19.
Remote control receiver 18, a remote controller (not shown) the operator of the projector 10 is used to receive optical infrared signals transmitted in response to the button operation. The remote control light receiving unit 18 decodes the infrared signal received from the remote control, generates operation data indicating the operation content of the remote control, and outputs the operation data to the control unit 30.
The operation panel 19 is provided in the exterior housing of the projector 10 and has various switches and indicator lamps. The operation detection unit 17 appropriately turns on and off the indicator lamp of the operation panel 19 according to the operation state and setting state of the projector 10 according to the control of the control unit 30. When the switch of the operation panel 19 is operated, operation data corresponding to the operated switch is output from the operation detection unit 17 to the control unit 30.

The image processing unit 40 processes the image data input via the image I / F unit 12 under the control of the control unit 30, and outputs an image signal to the light modulation device driving unit 46. The processing executed by the image processing unit 40 includes 3D (stereoscopic) image and 2D (planar) image discrimination processing, resolution conversion processing, frame rate conversion processing, distortion correction processing, digital zoom processing, color tone correction processing, luminance correction processing, and the like. is there. The image processing unit 40 executes processing designated by the control unit 30 and performs processing using parameters input from the control unit 30 as necessary. Of course, it is also possible to execute a combination of a plurality of processes.
The image processing unit 40 is connected to the frame memory 44. The image processing unit 40 expands the image data input from the image input I / F unit 12 in the frame memory 44, and executes the various processes described above on the expanded image data. The image processing unit 40 reads out the processed image data from the frame memory 44, generates R, G, B image signals corresponding to the image data, and outputs them to the light modulation device driving unit 46.
The light modulation device driving unit 46 connected to the liquid crystal panel of the light modulation device 22 drives the liquid crystal panel based on the image signal input from the image processing unit 40 and draws an image on each liquid crystal panel.

  The attitude sensor 47 is configured by an acceleration sensor, a gyro sensor, or the like, and outputs a detection value to the control unit 30. The attitude sensor 47 is fixed to the main body of the projector 10 so that the installation direction of the projector 10 can be identified.

  The emission device driving unit 48 is connected to the light emission device 60 via the connection unit 49. The connection unit 49 is a connector having a plurality of pins, for example, and the light emitting device 60 is wired to the projector 10 via the connection unit 49. The pins of the connection unit 49 are assigned to a pulse signal, a power supply, GND, and the like. The emission device driving unit 48 generates a pulse signal according to the control of the control unit 30 and outputs the pulse signal to the light emission device 60 via the connection unit 49. This pulse signal is a signal for PWM control of lighting of the light source unit 61, and the frequency, on period, and off period of the pulse are controlled by the control unit 30. The light source unit 61 is turned on and off at the timing specified by the control unit 30. Further, the control unit 30 can adjust the light amount of the light source unit 61 by adjusting the duty between the on period and the off period of the pulse. Further, the emission device driving unit 48 supplies power to the light emission device 60 through the connection unit 49.

  As shown in FIG. 1, the light emitting device 60 is configured by housing a light source unit 61 and optical components in a substantially box-shaped case. The light emitting device 60 of this embodiment includes a solid light source in the light source unit 61. Examples of solid light sources include infrared LEDs and infrared laser diodes. Infrared light emitted from the solid-state light source is diffused by the collimating lens and the Powell lens to form a surface along the screen SC. The light source unit 61 may include a plurality of solid light sources, and a light layer may be formed so as to cover the image projection range of the screen SC by diffusing light emitted from the plurality of solid light sources. The light emitting device 60 may include an adjustment mechanism that adjusts the distance and angle between the light layer emitted from the light source unit 61 and the screen SC.

  The light emitting device 60 turns on the light source unit 61 with a pulse signal and a power source supplied by the cable 60 a connected to the connection unit 49. For example, a pulse signal and a power source input by the cable 60a may be directly input to the light source unit 61. Therefore, the timing at which the solid state light source of the light source unit 61 is turned on and off can be controlled by the emission device driving unit 48. The control unit 30 controls the emission device driving unit 48 to turn on the light source unit 61 in synchronization with the timing when the imaging unit 51 described later performs imaging.

The position detection unit 50 detects operations performed by the indicators 70 and 80. The position detection unit 50 includes an imaging unit 51, a transmission unit 52, an imaging control unit 53, a pointer detection unit 54, and a coordinate calculation unit 55. The position detection unit 50 functions as an operation detection unit.
The imaging unit 51 includes an imaging optical system, an imaging element, an interface circuit, and the like, and images the projection direction of the projection optical system 23. The imaging optical system of the imaging unit 51 is arranged so as to face substantially the same direction as the projection optical system 23, and has an angle of view that covers a range in which the projection optical system 23 projects an image on the screen SC. Examples of the imaging device include a CCD and a CMOS that receive light in the infrared region and the visible light region. The imaging unit 51 may include a filter that blocks a part of the light incident on the imaging element. For example, when receiving infrared light, a filter that mainly transmits infrared light is provided in front of the imaging element. May be arranged. Further, the interface circuit of the imaging unit 51 reads and outputs the detection value of the imaging element.

  The imaging control unit 53 causes the imaging unit 51 to perform imaging and generates captured image data. When the imaging device performs imaging with visible light, an image projected on the screen SC is captured. This captured image is used for distortion correction processing for correcting, for example, trapezoidal distortion or pincushion distortion of the projected image. In addition, the imaging control unit 53 can capture infrared light by the imaging unit 51, and in this case, the captured image includes infrared light (infrared signal) emitted from the indicator 70 and reflection reflected by the indicator 80. Light is reflected.

The indicator detection unit 54 detects the indication positions of the indicators 70 and 80 based on the captured image data captured by the imaging control unit 53. The indicator detection unit 54 reflects the image of the infrared light emitted by the indicator 70 and the reflection of the indicator 80 from the captured image data when the imaging control unit 53 causes the imaging unit 51 to perform infrared imaging. At least one of the reflected light image is detected. Further, the indicator detection unit 54 may determine whether the detected image is an image of light emitted from the indicator 70 or an image of reflected light from the indicator 80.
The coordinate calculation unit 55 calculates the coordinates of the pointing positions of the pointers 70 and 80 in the captured image data based on the position of the image detected by the pointer detection unit 54 and outputs the calculated coordinates to the control unit 30. The coordinate calculation unit 55 may also calculate the coordinates of the indication positions of the indicators 70 and 80 in the projection image projected by the projection unit 20 and output them to the control unit 30. Further, the coordinate calculation unit 55 is configured to display the coordinates of the pointing positions of the indicators 70 and 80 in the image data drawn by the image processing unit 40 in the frame memory 44 and the indicators 70 and 80 in the input image data of the image I / F unit 12. The coordinates of the designated position may be calculated.

  The transmission unit 52 transmits an infrared signal to the indicator 70 according to the control of the indicator detection unit 54. The transmission unit 52 has a light source such as an infrared LED, and turns on and off the light source according to the control of the indicator detection unit 54.

Next, functional blocks provided in the control unit 30 will be described. The control unit 30 reads out and executes the control program 111 stored in the storage unit 110, thereby realizing the functions of the projection control unit 31, the detection control unit 32, and the emission control unit 33, and controls each unit of the projector 10. .
The projection control unit 31 acquires the content of the operation performed by the operator based on the operation data input from the operation detection unit 17. The projection control unit 31 controls the image processing unit 40, the light source driving unit 45, and the light modulation device driving unit 46 according to the operation performed by the operator, and projects an image on the screen SC. The projection control unit 31 controls the image processing unit 40 to determine the above-described 3D (stereoscopic) image and 2D (planar) image, resolution conversion processing, frame rate conversion processing, distortion correction processing, digital zoom processing, and tone correction. Processing, brightness correction processing, and the like are executed. Further, the projection control unit 31 controls the light source driving unit 45 in accordance with the processing of the image processing unit 40 and controls the light amount of the light source unit 21.

The detection control unit 32 controls the position detection unit 50 to detect the operation positions of the indicators 70 and 80 and acquires the coordinates of the operation positions. Further, the detection control unit 32 obtains data for identifying whether the operation position of the indicator 70 or the operation position of the indicator 80 and the data indicating the operation state of the operation switch 711 together with the coordinates of the operation position. . The detection control unit 32 executes a preset process based on the acquired coordinates and data. For example, based on the acquired coordinates, a graphic is drawn by the image processing unit 40 and the drawn graphic is superimposed on an input image input to the image I / F unit 12 and projected. The detection control unit 32 may output the acquired coordinates to an external device such as a PC connected to the I / F unit 11. In this case, the detection control unit 32 may convert the acquired coordinates into a data format recognized as an input of the coordinate input device in the operating system of the external device connected to the I / F unit 11 and output the converted data. Good. For example, when a PC operating on a Windows (registered trademark) operating system is connected to the I / F unit 11, data processed as input data of HID (Human Interface Device) in the operating system is output. In addition to the coordinate data, the detection control unit 32 outputs data for identifying whether the operation position of the indicator 70 or the operation position of the indicator 80 and data indicating the operation state of the operation switch 711 are output. Also good.
Further, the detection control unit 32 controls position detection using the indicator 80. Specifically, the detection control unit 32 determines whether or not the light emitting device 60 can be used based on whether or not the light emitting device 60 is connected, the determination result of the determination unit 34, and the detection result of the abnormality detection unit 35. To do. When the light emitting device 60 cannot be used, the detection control unit 32 performs setting so that the light emitting device 60 cannot be used. Here, the detection control unit 32 may notify that the light emitting device 60 cannot be used.

The emission control unit 33 controls the emission device driving unit 48 to execute or stop the output of the power source and the pulse signal to the light emission device 60 connected to the connection unit 49. When the light emission device 60 cannot be used or is not used by the control of the detection control unit 32 or the setting performed by the function of the setting control unit 36, the emission control unit 33 supplies the power and pulse of the emission device driving unit 48. Stop signal output. When the light emitting device 60 is used, the emission control unit 33 outputs the power supply and pulse signal of the emission device driving unit 48.
Further, the emission control unit 33 may control the emission device driving unit 48 to determine whether or not the light emission device 60 is connected to the connection unit 49. For example, when the light emitting device 60 is connected to the connection portion 49, the resistance value between pins of the connector of the connection portion 49 can be changed. In this case, the detection control unit 32 can determine the presence or absence of the light emitting device 60 by causing the emission device driving unit 48 to detect the resistance value between the pins of the connection unit 49. When the light emitting device 60 is not connected, the detection control unit 32 stops or does not start the power supply of the emitting device driving unit 48 and the output of the pulse signal.

  Next, the indicator 70 will be described with reference to FIG. The indicator 70 is a pen-type operation device, and emits infrared light when the tip is pressed or when an instruction command is received from the projector 10.

  The indicator 70 includes an operation switch 711. The operation switch 711 is provided at the distal end portion 71 of the indicator 70. When the operation switch 711 is operated to press the distal end portion 71 against the wall or the screen SC, the contact state is turned on by pressing the distal end.

  The indicator 70 includes an infrared light emitting unit 712 and an infrared light receiving unit 713. The infrared light emitting unit 712 turns on infrared light under the control of the microcomputer 720. In synchronization with the lighting timing of the infrared light emitting unit 712, the projector 10 generates captured image data by the imaging control unit 53, and the indicator detection unit 54 determines the indication position of the indicator 70 based on the generated captured image data. Calculate the coordinates. The infrared light receiving unit 713 includes a photodiode or a phototransistor as a light receiving element, and receives infrared light emitted from the projector 10 or infrared light emitted from the infrared light emitting unit 712 to generate a detection current. The detection current output from the infrared light receiving unit 713 is converted into a detection voltage, A / D converted, and input to the microcomputer 720.

The indicator 70 includes a power control unit 714. The power control unit 714 is connected to the operation switch 711, the infrared light emitting unit 712, the infrared light receiving unit 713, the acceleration sensor 716, and the microcomputer 720. In addition, a battery 715 that supplies power is connected to the power supply control unit 714. The power supply control unit 714 selectively supplies the power supplied from the battery 715 to the operation switch 711, the infrared light emitting unit 712, the infrared light receiving unit 713, the acceleration sensor 716, and the microcomputer 720 according to the control of the microcomputer 720.
The indicator 70 has a normal mode and a power saving mode as operation modes. In the normal mode, the power of the battery 715 is supplied to the infrared light emitting unit 712, the infrared light receiving unit 713, the acceleration sensor 716, the microcomputer 720, and the like, and the indicator 70 is operable.
The power saving mode is a mode in which power supply is limited and power consumption is reduced as compared with the normal mode. For example, in the power saving mode, power supply to the infrared light emitting unit 712, the infrared light receiving unit 713, and the acceleration sensor 716 is stopped by the power supply control unit 714. In the power saving mode, the frequency of the operation clock supplied to a CPU (Central Processing Unit) 721 included in the microcomputer 720 is kept low, and the power supply is also reduced. In the power saving mode, the power supply to the CPU 721 may be turned off. Since the power saving mode is a mode in which the power consumption is reduced as compared with the normal mode, the power saving mode can also be referred to as a state in which the power source of the indicator 70 is turned off.

  The acceleration sensor 716 is a sensor that detects the posture of the indicator 70. The acceleration sensor 716 measures the acceleration of the indicator 70 every predetermined time or when there is an instruction from the microcomputer 720, and outputs a sensor signal including the measured acceleration information to the microcomputer 720. As the acceleration sensor 716, a generally known sensor such as a piezoelectric type, a semiconductor piezoresistive type, or a capacitance type can be used. Further, instead of the acceleration sensor 716, a sensor that can detect a change in the posture of the indicator 70 such as a vibration sensor, a gyro sensor, or a speed sensor may be used.

  The microcomputer 720 includes a CPU 721 and a memory unit 722. The memory unit 722 is a non-volatile storage unit, and stores a control program executed by the CPU 721 and data processed by the CPU 721. The memory unit 722 stores information on the delay time of the infrared light receiving unit 713 detected by the operation characteristic detection process. Details of the operation characteristic detection process and the delay time will be described later. The CPU 721 controls each unit of the indicator 70 by executing a control program stored in the memory unit 722.

Here, a method of specifying the indicator 70 from the captured image data of the imaging unit 51 by mutual communication between the position detection unit 50 and the indicator 70 will be described.
When detecting the position pointing operation by the pointer 70, the control unit 30 controls the pointer detection unit 54 to transmit a synchronization signal from the transmission unit 52. That is, the indicator detection unit 54 turns on the light source of the transmission unit 52 at a predetermined period in accordance with the control of the control unit 30. The infrared light periodically emitted from the transmission unit 52 functions as a synchronization signal that synchronizes the position detection unit 50 and the indicator 70.
On the other hand, the microcomputer 720 receives the infrared light emitted from the transmission unit 52 of the projector 10 by the infrared light receiving unit 713 after power supply from the battery 715 is started and a predetermined initialization operation is performed. When the infrared light periodically emitted by the transmission unit 52 is received by the infrared light receiving unit 713, the microcomputer 720 synchronizes with the timing of the infrared light, and uses the light emission of the infrared light emitting unit 712 with a preset lighting pattern. Turn on (emit). This lighting pattern represents data specific to the indicator 70 by turning on and off the light source corresponding to ON and OFF of the data. The microcomputer 720 turns on and off the light source according to the set pattern turn-on time and turn-off time. The microcomputer 720 repeatedly executes the above pattern while power is supplied from the battery 715. That is, the position detection unit 50 periodically transmits an infrared signal for synchronization to the indicator 70, and the indicator 70 synchronizes with the infrared signal transmitted by the position detection unit 50 to set the infrared signal set in advance. Send. In this specification, the operation of turning on (emitting) the light source of the infrared light emitting unit 712 in synchronization with the synchronization signal transmitted from the transmission unit 52 is referred to as “normal operation” of the indicator 70.
The projector 10 can also transmit an instruction command for controlling the indicator 70 by using the transmission unit 52 in addition to the synchronization infrared signal. The projector 10 gives an instruction command for instructing the indicator 70 to execute the operation characteristic detection process when the power of the projector 10 is turned off, at the time of warming up immediately after the projector 10 is started, or when AV mute is executed. Send. In addition, a transmission unit for transmitting the instruction command may be provided separately.

The shooting control unit 53 of the position detection unit 50 performs control to match the shooting timing of the imaging unit 51 with the timing when the indicator 70 is turned on. This shooting timing is determined based on the timing when the indicator detection unit 54 turns on the transmission unit 52. The indicator detection unit 54 can specify a pattern in which the indicator 70 is turned on depending on whether or not the image of the light of the indicator 70 is captured in the captured image data of the imaging unit 51. Here, the control unit 30 may synchronize the timing at which the indicator 70 transmits (emits) an infrared signal with the imaging timing of the imaging unit 51. This control is easily realized by adjusting the transmission timing of the synchronization infrared signal transmitted from the position detection unit 50 to the indicator 70 with reference to the timing at which the imaging control unit 53 causes the imaging unit 51 to perform imaging. it can.
The pattern in which the indicator 70 is turned on can include a pattern common to the plurality of indicators 70 and a pattern unique to each individual, or a pattern unique to each individual indicator 70. In this case, the indicator detection unit 54 can distinguish each image as an image of a different indicator 70 when the captured image data includes images of infrared light emitted from the plurality of indicators 70.

  In addition, the control unit 30 controls the emission device driving unit 48 to synchronize the lighting timing of the light source unit 61 with the imaging timing of the imaging unit 51. When the light source unit 61 turns on the pulse in synchronization with the imaging timing of the imaging unit 51, the reflected light of the indicator 80 appears in the captured image of the imaging unit 51 when the indicator 80 points on the screen SC. When the light source unit 61 is turned on in a pattern that can be distinguished from the lighting timing of the indicator 70, the indicator detection unit 54 determines whether the image shown in the captured image data is the indicator 70 or the indicator 80. it can. For example, consider a case in which the indicator 70 is turned on in synchronization with all the shooting timings of the imaging unit 51 and the light source unit 61 is turned on in a pattern of “1010101010” (1 indicates lighting and 0 indicates light extinction). In this case, it can be determined that the image taken when the light source unit 61 is not lit is due to the indicator 70.

  Next, processing of the microcomputer 720 provided in the indicator 70 will be described. When a predetermined condition is satisfied, the microcomputer 720 uses the infrared light emitting unit 712 to perform a process for detecting the operating characteristics of the light receiving element included in the infrared light receiving unit 713. The microcomputer 720 controls the light emission of the infrared light emitting unit 712 based on the detected operation characteristic of the light receiving element. A light receiving element such as a photodiode or a phototransistor used for the infrared light receiving unit 713 receives infrared light and outputs a detection current, but in a reaction time until receiving infrared light and outputting a detection current. There are individual differences. For this reason, the infrared light receiving unit 713 receives infrared light and outputs a detection current, and there is an individual difference in the time from when this detection current is subjected to voltage conversion, A / D conversion and input to the microcomputer 720. Moreover, this time changes also with temperature, aged deterioration, etc. For this reason, unless the operating characteristics of the light receiving element are regularly detected, the indicator 70 may not operate correctly in response to an instruction notified from the projector 10 by an infrared signal.

  Next, the predetermined condition described above will be described. The microcomputer 720 is predetermined when at least one of a condition for determining that the indicator 70 is not operated by the user and a condition for determining that the indicator 70 is not performing infrared communication with the projector 10 is satisfied. It is determined that the condition is met. If the operation characteristic detection process is performed while the indicator 70 is operated by the user or during infrared communication with the projector 10, the infrared light receiving unit 713 is likely to be operating. May not be detected correctly. Therefore, the microcomputer 720 determines whether or not a predetermined condition is satisfied, and executes an operation characteristic detection process when determining that the predetermined condition is satisfied.

  As a predetermined condition, there is a case where the infrared light receiving unit 713 has not received the infrared light emitted from the transmission unit 52 of the projector 10 for a predetermined time, or the microcomputer 720 has not detected the operation of the operation switch 711 for a predetermined time. Can be mentioned. Further, when the infrared light receiving unit 713 has not received the infrared light emitted from the projector 10 for a predetermined time and the microcomputer 720 has not detected the operation of the operation switch 711 for the predetermined time, It may be determined that the predetermined condition is satisfied. When the microcomputer 720 determines that a predetermined condition is satisfied, the microcomputer 720 performs an operation characteristic detection process and stores the detection result in the memory unit 722. In addition, when the microcomputer 720 performs the operation characteristic detection process when a predetermined condition is satisfied, the operation mode of the indicator 70 is shifted from the normal mode to the power saving mode.

Moreover, as the above-mentioned predetermined condition, it can be mentioned immediately after the battery 715 is inserted into the indicator 70 and the microcomputer 720 is activated. Immediately after the battery is replaced with a new battery 715, it is unlikely that the indicator 70 is operating under the control of the projector 10. For this reason, the microcomputer 720 performs an operation characteristic detection process immediately after the battery 715 is replaced and the microcomputer 720 is activated.
Further, as the predetermined condition described above, there is a case where a change in the posture of the indicator 70 is not detected for a certain period of time. A change in the posture of the indicator 70 is determined based on acceleration information measured by the acceleration sensor 716. For example, when there is a change in the acceleration value measured by the acceleration sensor 716, it can be determined that the user is operating the indicator 70 with the indicator 70 in hand. When the acceleration value measured by the acceleration sensor 716 does not change for a certain period of time, that is, when the state in which acceleration cannot be detected continues for a certain period of time, the indicator 70 is placed at a predetermined position such as a table, and the user moves the indicator 70. Can be determined not to be operated. For this reason, the microcomputer 720 performs an operation characteristic detection process when it is determined that the state in which the acceleration sensor 716 cannot detect the acceleration continues for a certain period of time.

Further, when the microcomputer 720 receives an instruction command from the projector 10, it may be determined that a predetermined condition is satisfied, and an operation characteristic detection process may be executed. For example, the projector 10 transmits an instruction command for instructing execution of the operation characteristic detection process to the indicator 70 when the power of the projector 10 is turned off or during warm-up immediately after the projector 10 is started. Transmission of the instruction command from the projector 10 to the microcomputer 720 can use infrared communication. For example, the projector 10 transmits an instruction command to the indicator 70 using the transmission unit 52 of the position detection unit 50.
Further, the projector 10 may transmit an instruction command for instructing execution of the operation characteristic detection process to the indicator 70, for example, when performing AV mute (muting video and audio output).
Note that the microcomputer 720 does not have to perform the operation characteristic detection process in all cases where the predetermined condition is satisfied, and may perform the operation characteristic detection process when at least one predetermined condition is satisfied.

Next, details of the operation characteristic detection processing will be described.
The microcomputer 720 first turns on the infrared light emitting unit 712 to turn on the infrared light. Next, the microcomputer 720 measures the delay time. The delay time measured here is that the microcomputer 720 instructs the infrared light emitting unit 712 to turn on infrared light, and then the detected current output from the infrared light receiving unit 713 that receives the infrared light is converted into voltage, A / This is the time from D conversion to input to the microcomputer 720. The microcomputer 720 stores the measured delay time in the memory unit 722 and ends the operation characteristic detection process. The microcomputer 720 corrects the synchronization timing based on the delay time stored in the memory unit 722 when performing control to synchronize with the timing at which the infrared light emitted from the projector 10 is received. Accordingly, it is possible to reduce a deviation between the timing at which the infrared light emitting unit 712 of the indicator 70 is turned on and the timing at which the imaging unit 51 of the projector 10 performs imaging.

Next, the processing procedure of the microcomputer 720 will be described with reference to the flowchart shown in FIG. When the battery 715 is inserted into the indicator 70 and energized and the microcomputer 720 is activated (step S1; Yes), the microcomputer 720 executes an operation characteristic detection process (step S2). Details of the operation characteristic detection processing will be described with reference to the flowchart shown in FIG. When the operation characteristic detection process ends, the microcomputer 720 determines whether an infrared signal transmitted from the projector 10 has been received (step S3). When the infrared signal is received (step S3; Yes), the microcomputer 720 performs processing according to the received infrared signal (step S4). For example, when the infrared signal received from the projector 10 is a synchronization infrared signal, the microcomputer 720 causes the infrared light emitting unit 712 to emit light in synchronization with the reception of the synchronization infrared signal as a normal operation. In synchronization with the lighting timing of the indicator 70, the projector 10 causes the imaging unit 51 to capture the screen SC direction and generate captured image data. The indicator detection unit 54 specifies a pattern in which the indicator 70 is turned on depending on whether or not the image of the light of the indicator 70 is captured in the captured image data of the imaging unit 51.
If the infrared signal received from the projector 10 is an instruction command for instructing the execution of the operation characteristic detection process, the microcomputer 720 executes the operation characteristic detection process. The projector 10 gives an instruction command for instructing the indicator 70 to execute the operation characteristic detection process when the power of the projector 10 is turned off, at the time of warming up immediately after the projector 10 is started, or when AV mute is executed. Send. The microcomputer 720 executes an operation characteristic detection process, and stores a delay time as a detection result in the memory unit 722.

  In step S3, when the infrared signal is not received (step S3; No), the microcomputer 720 determines whether or not the operation of the operation switch 711 is detected (step S5). When the operation of the operation switch 711 is detected (step S5; Yes), the microcomputer 720 lights up the infrared light emitting unit 712 with a preset pattern in synchronization with the reception timing of the infrared signal transmitted from the projector 10 ( Light emission) (step S6). This lighting pattern is a unique pattern for each individual indicator 70.

  In step S5, when the operation of the operation switch 711 is not detected (step S5; No), the microcomputer 720 determines whether or not a predetermined time has elapsed since the reception of the infrared signal transmitted from the projector 10 (step S5). S7). That is, it is determined whether or not the infrared signal transmitted from the projector 10 has not been received for a certain period of time. If the predetermined time has not elapsed since the reception of the infrared signal (step S7; No), the microcomputer 720 returns to the process of step S3 and repeats the process from step S3. If a certain time has elapsed since the reception of the infrared signal (step S7; Yes), the microcomputer 720 determines whether or not a certain time has elapsed since the operation of the operation switch 711 was detected (step S8). That is, it is determined whether or not the operation of the operation switch 711 is not detected for a certain period of time. When the predetermined time has not elapsed since the operation of the operation switch 711 was detected (step S8; No), the microcomputer 720 returns to the process of step S3 and repeats the process from step S3. If a certain time has elapsed since the operation of the operation switch 711 was detected (step S8; Yes), the microcomputer 720 starts an operation characteristic detection process (step S9). This operation characteristic detection process is executed in the same procedure as the detection process in step S2. Details of this processing will also be described later. The microcomputer 720 executes an operation characteristic detection process (step S9), and stores a delay time as a detection result in the memory unit 722. Then, the microcomputer 720 shifts to the power saving mode (step S10).

Here, the details of the operation characteristic detection processing will be described with reference to the flowchart shown in FIG.
First, the microcomputer 720 turns on the infrared light emitting unit 712 (step S21). Next, the microcomputer 720 determines whether or not a signal corresponding to the detection current output from the infrared light receiving unit 713 has been input (step S22). This signal is a signal obtained by voltage-converting and A / D-converting the detection current output from the infrared light receiving unit 713. When a signal is input (step S22; Yes), the microcomputer 720 calculates a delay time (step S23). For the delay time, the microcomputer 720 instructs the infrared light emitting unit 712 to turn on the infrared light, and then the detected current output from the infrared light receiving unit 713 that receives the infrared light is voltage-converted and A / D converted, and the microcomputer This is the time until input to 720. When calculating the delay time, the microcomputer 720 stores the calculated delay time in the memory unit 722 (step S24).

Next, the processing of the microcomputer 720 after shifting to the power saving mode will be described with reference to the flowchart shown in FIG.
When an interrupt signal is input to an interrupt port (not shown) of the microcomputer 720 in the power saving mode (step S11; Yes), the microcomputer 720 is activated. For example, when an operation of the operation switch 711 is detected, an interrupt signal is output to an interrupt port of the microcomputer 720 by an interrupt controller (not shown). Further, even when a predetermined time is counted by a timer (not shown), an interrupt signal is output to the interrupt port of the microcomputer 720 by the interrupt controller.
The microcomputer 720 that has input the interrupt signal controls the power control unit 714 to resume power supply, and shifts from the power saving mode to the normal mode (step S12). The microcomputer 720 that has shifted to the normal mode determines whether or not the factor that generated the interrupt signal (interrupt factor) was the ON operation of the operation switch 711 (step S13). If the interrupt factor is the ON operation of the operation switch 711 (step S13; Yes), has the microcomputer 720 shifted to the process of step S3 illustrated in FIG. 4 and has received the infrared signal transmitted from the projector 10? It is determined whether or not (step S3). For example, when the infrared signal received from the projector 10 is a synchronization infrared signal, the microcomputer 720 causes the infrared light emitting unit 712 to emit light in synchronization with the reception of the synchronization infrared signal as a normal operation ( Step S4). At this time, the microcomputer 720 corrects the synchronization timing based on the delay time stored in the memory unit 722 when performing control to synchronize with the timing at which the infrared light emitted from the projector 10 is received.
If the interrupt factor is not an ON operation of the operation switch 711 (step S13; No), it is determined that the interrupt factor is a predetermined time measured by the timer, and the microcomputer 720 causes the acceleration sensor 716 to measure acceleration. (Step S14). The acceleration sensor 716 measures acceleration and outputs a sensor signal including the measured acceleration information to the microcomputer 720. When the microcomputer 720 receives the sensor signal from the acceleration sensor 716 (step S14), the microcomputer 720 acquires acceleration information from the received sensor signal and determines whether or not the posture of the indicator 70 has changed (step S15). If it determines with the attitude | position of the indicator 70 having changed (step S15; Yes), the microcomputer 720 will transfer to the process of step S3 shown in FIG. 4, and will determine whether the infrared signal transmitted from the projector 10 was received. Determine (step S3). For example, when the infrared signal received from the projector 10 is a synchronization infrared signal, the microcomputer 720 causes the infrared light emitting unit 712 to emit light in synchronization with the reception of the synchronization infrared signal. The microcomputer 720 corrects the synchronization timing based on the delay time stored in the memory unit 722 when performing control to synchronize with the timing at which the infrared light emitted from the projector 10 is received.
If it is determined from the acceleration information measured by the acceleration sensor 716 that there is no change in the posture of the indicator 70 (step S15; No), the microcomputer 720 transitions again to the power saving mode (step S16). The microcomputer 720 controls the power supply control unit 714 to turn off the power supply to the infrared light emitting unit 712, the infrared light receiving unit 713, the acceleration sensor 716, and the like. In addition, the microcomputer 720 instructs the frequency of the operation clock supplied to the microcomputer 720 to be lowered, and controls the power supply control unit 714 so that the power supply to the microcomputer 720 is also reduced.

Next, the second processing procedure of the microcomputer 720 will be described with reference to the flowchart shown in FIG. In this flow, operation characteristic detection processing is performed based on a sensor signal measured by the acceleration sensor 716. Of the procedure shown in FIG. 7, the procedure from step S31 to S36 is the same as the procedure shown in FIG.
If the operation of the operation switch 711 is not detected in step S35, the microcomputer 720 determines whether or not there is a change in the posture of the indicator 70 using the acceleration information stored in the memory unit 722 ( Step S37). The acceleration sensor 716 measures acceleration every predetermined time and transmits the measured acceleration information to the microcomputer 720 as a sensor signal. The microcomputer 720 acquires acceleration information from the sensor signal received from the acceleration sensor 716, and stores the acquired acceleration information in the memory unit 722. The microcomputer 720 refers to the most recently measured acceleration information among the acceleration information stored in the memory unit 722, and determines whether or not the posture of the indicator 70 has changed (step S37). If there is a change in the posture of the indicator 70 (step S37; Yes), the microcomputer 720 proceeds to the process of step S33 and determines whether an infrared signal has been received (step S33). When there is no change in the posture of the indicator 70 (step S37; No), the microcomputer 720 continues the state in which the acceleration does not change for a certain period of time and the state in which the posture of the indicator 70 does not change for a certain period of time. It is determined whether or not (step S38). When it is determined that the state in which the posture of the indicator 70 is not changed continues for a certain time (step S38; Yes), the microcomputer 720 executes an operation characteristic detection process (step S39). The operation characteristic detection process is as described with reference to the flowchart of FIG. When the operation characteristic detection process ends, the microcomputer 720 shifts to the power saving mode (step S40). On the other hand, when it is determined that the state where the acceleration does not change does not continue for a certain time (step S38; No), the microcomputer 720 returns to step S33 and repeats the processes of steps S33 to S38.

  As described above, the indicator 70 of the present embodiment includes the infrared light emitting unit 712 and the infrared light receiving unit 713, and an instruction to cause the infrared light emitting unit 712 to emit light in response to light reception by the infrared light receiving unit 713 during normal operation. Body 70. In addition, the indicator 70 uses the infrared light emitting unit 712 to detect the operating characteristics of the infrared light receiving unit 713 when a predetermined condition is satisfied, and based on the detection result, the infrared light emitting unit 712 during normal operation. Is provided with a microcomputer 720 for controlling the light emission. For this reason, the operating characteristics of the infrared light receiving unit 713 can be detected using the infrared rays emitted from the infrared light emitting unit 712. Further, the light emission of the infrared light emitting unit 712 can be controlled based on the detection result. Accordingly, when the infrared light receiving unit 713 receives infrared light and causes the infrared light emitting unit 712 to emit light, the influence of the operating characteristics of the infrared light receiving unit 713 can be reduced. For this reason, the fall of operativity can be suppressed corresponding to the operation characteristic by the light reception of infrared light.

  Further, the microcomputer 720 measures the time from when the infrared light emitting unit 712 emits light until the infrared light receiving unit 713 detects light reception when a predetermined condition is satisfied, and based on the measured time, the normal operation is performed. The light emission timing of the infrared light emitting unit 712 at the time is controlled. For this reason, even if the time until light reception is detected by the infrared light receiving unit 713 is shifted, the infrared light emitting unit 712 can emit light at a timing at which the influence of the operating characteristics of the infrared light receiving unit 713 is reduced.

  Further, as a predetermined condition, the microcomputer 720 detects the operation characteristics of the infrared light receiving unit 713 when the infrared light receiving unit 713 has not received infrared light for a predetermined time. For this reason, the operation characteristic of the infrared light receiving unit 713 can be detected at a timing when the infrared light receiving unit 713 does not receive infrared light.

  The microcomputer 720 detects the operating characteristics of the infrared light receiving unit 713 when the operation of the operation switch 711 included in the indicator 70 is not detected as a predetermined condition. For this reason, the operation characteristic of the infrared light receiving unit 713 can be detected at a timing when the indicator 70 is not operated.

  In addition, when a predetermined condition is satisfied, the microcomputer 720 detects the operating characteristics of the infrared light receiving unit 713 and shifts to a power saving mode in which the power consumption of the indicator 70 is reduced. For this reason, when the indicator 70 is not operated, the operation mode of the indicator 70 can be shifted to the power saving mode.

  In addition, the microcomputer 720 has, as a predetermined condition, at least one of a case where the battery 715 is inserted into the indicator 70 and a case where the acceleration sensor 716 detects that the posture of the indicator 70 does not change for a certain period of time. The operational characteristics of the infrared light receiving unit 713 are detected. For this reason, the operation characteristic of the infrared light receiving unit 713 can be detected at a timing when the indicator 70 is not operated.

  Further, the projection system 1 of the present embodiment includes an indicator 70 and a projector 10. The indicator 70 includes an infrared light emitting unit 712 and an infrared light receiving unit 713, and causes the infrared light emitting unit 712 to emit light in response to light reception by the infrared light receiving unit 713 during normal operation. The projector 10 receives the infrared light emitted from the infrared light emitting unit 712 of the indicator 70 and detects the position of the indicator 70. The indicator 70 detects the operating characteristics of the infrared light receiving unit 713 using the infrared light emitting unit 712 when a predetermined condition is satisfied, and emits light from the infrared light emitting unit 712 in the normal operation based on the detection result. A microcomputer 720 to be controlled is provided. For this reason, the operating characteristics of the infrared light receiving unit 713 can be detected using the infrared rays emitted from the infrared light emitting unit 712. Further, the light emission of the infrared light emitting unit 712 can be controlled based on the detection result. Accordingly, when the infrared light receiving unit 713 receives infrared light and causes the infrared light emitting unit 712 to emit light, the influence of the operating characteristics of the infrared light receiving unit 713 can be reduced. For this reason, the fall of operativity can be suppressed corresponding to the operation characteristic by the light reception of infrared light.

  The projector 10 includes a transmission unit 52 that projects light onto the indicator 70. In addition, the microcomputer 720 of the indicator 70 performs control to cause the infrared light emitting unit 712 to emit light in synchronization with the timing of receiving the infrared light projected by the projector 10 during normal operation, and the synchronization timing is determined based on the infrared light reception. Correction is performed based on the detection result of the operation characteristic of the unit 713. For this reason, the influence by the operating characteristics of the infrared light receiving unit 713 can be reduced, and the infrared light emitting unit 712 can emit light in synchronization with the timing of receiving the infrared light projected by the projector 10. Therefore, a decrease in operability of the indicator 70 can be suppressed.

  The projector 10 notifies the indicator 70 of the timing at which the operating characteristic of the infrared light receiving unit 713 is detected by the transmission unit 52. The microcomputer 720 detects the operation characteristic of the infrared light receiving unit 713 at a timing notified from the projector 10 as a predetermined condition. In response to an instruction from the projector, the indicator 70 can detect the operation characteristics of the infrared light receiving unit 713.

Note that the above-described embodiments and modifications are merely examples of specific modes to which the present invention is applied, and the present invention is not limited thereto, and the present invention can be applied as different modes. In the above-described embodiment, the indicator is not limited to the pen-type indicator 70 or the indicator 80 that is a user's finger, and a laser pointer, an indicator bar, or the like may be used, and the shape or size thereof is not limited.
Moreover, in the said embodiment and modification, although the light-projection apparatus 60 was comprised separately from the main body of the projector 10, and illustrated the structure connected with the cable 60a, this invention is not limited to this. For example, the light emitting device 60 may be integrally attached to the main body of the projector 10 or may be configured to be built in the main body of the projector 10. Further, the light emitting device 60 may be supplied with power from the outside and connected to the emitting device driving unit 48 by a wireless communication line.

  Moreover, in the said embodiment, although the position detection part 50 image | photographed the screen SC by the imaging part 51 and pinpointed the position of the indicator 70, this invention is not limited to this. For example, the imaging unit 51 is not limited to the one provided in the main body of the projector 10 and photographing the projection direction of the projection optical system 23. The imaging unit 51 may be arranged separately from the main body of the projector 10, or the imaging unit 51 may perform imaging from the side or front of the screen SC. Further, a plurality of imaging units 51 may be arranged, and the detection control unit 32 may detect the positions of the indicators 70 and 80 based on the captured image data of the plurality of imaging units 51.

In the above embodiment, the light modulation device 22 that modulates the light emitted from the light source has been described by taking as an example a configuration using three transmissive liquid crystal panels corresponding to RGB colors. Is not limited to this. For example, a configuration using three reflective liquid crystal panels may be used, or a method in which one liquid crystal panel and a color wheel are combined may be used. Alternatively, a system using three digital mirror devices (DMD), a DMD system combining one digital mirror device and a color wheel, or the like may be used. When only one liquid crystal panel or DMD is used as the light modulation device, a member corresponding to a composite optical system such as a cross dichroic prism is unnecessary. In addition to the liquid crystal panel and DMD, any light modulation device capable of modulating light emitted from the light source can be employed without any problem.
In the above embodiment, a mode has been described in which the user performs an instruction operation with the indicators 70 and 80 on the screen SC (projection surface, display surface) on which the front projection type projector 10 projects (displays) an image. The user may perform an instruction operation on a display screen (display surface) on which an image is displayed on a display device (display unit) other than the projector 10. Also in this case, the light emitting device 60 and the imaging unit 51 may be configured integrally with the display device, or may be configured separately from the display device. Display devices other than the projector 10 include a rear projection type projector, a liquid crystal display, an organic EL (Electro Luminescence) display, a plasma display, a CRT (cathode ray tube) display, and a SED (Surface-conduction Electron-emitter Display). Etc. can be used.

Moreover, each function part of the projection system 1 shown in FIG. 2 shows a functional structure, and a specific mounting form is not particularly limited. That is, it is not always necessary to mount hardware corresponding to each function unit individually, and it is of course possible to adopt a configuration in which the functions of a plurality of function units are realized by one processor executing a program. In addition, in the above embodiment, a part of the function realized by software may be realized by hardware, or a part of the function realized by hardware may be realized by software. In addition, specific detailed configurations of other parts of the projection system 1 can be arbitrarily changed without departing from the spirit of the present invention.
Further, the light emitted from the transmitter 52 and the indicator 70 is not limited to infrared light, and may be light in a wavelength region other than infrared light.
In the above-described embodiment, the projector 10 is described as an example of the position detection device. However, an apparatus that can be used in combination with the indicator 70 is not limited to the projector 10 and projects light. Any device having a light projecting unit may be used.
In the above embodiment, the configuration in which the projector 10 transmits the synchronization signal to the indicator 70 using the infrared signal emitted from the transmission unit 52 to the indicator 70 has been described. However, the synchronization signal is an infrared signal. It is not limited to. For example, a synchronization signal may be transmitted by radio wave communication or ultrasonic wireless communication. This configuration can be realized by providing the projector 10 with a transmission unit that transmits signals by radio wave communication or ultrasonic radio communication, and providing the indicator 70 with a similar reception unit.

  DESCRIPTION OF SYMBOLS 1 ... Projection system (position detection system) 10 ... Projector, 20 ... Projection part, 21 ... Light source part, 22 ... Light modulation apparatus, 23 ... Projection optical system, 30 ... Control part, 31 ... Projection control part, 32 ... Detection Control unit 33 ... Ejection control unit 34 34 Determination unit 35 35 Abnormality detection unit 36 Setting control unit 40 Image processing unit 47 Posture sensor 48 Ejection device drive unit 49 Connection unit 50 ... Position detecting section, 52 ... Transmitting section (device light emitting section), 60 ... Light emitting device, 70 ... Indicator (operation device), 80 ... Indicator, 110 ... Storage section, 711 ... Operation switch (operator), 712 ... infrared light emitting part (light emitting part), 713 ... infrared light receiving part (light receiving part), 716 ... acceleration sensor (attitude detection sensor), 720 ... microcomputer (control part), SC ... screen.

Claims (10)

An operation device including a light emitting unit and a light receiving unit, and causing the light emitting unit to emit light in response to light reception by the light receiving unit during normal operation,
A control unit is provided that detects the operating characteristics of the light receiving unit using the light emitting unit when a predetermined condition is satisfied, and controls light emission of the light emitting unit during the normal operation based on a detection result. An operation device characterized by that.   When the predetermined condition is satisfied, the control unit measures the time from when the light emitting unit emits light until the light receiving unit detects light reception, and based on the measured time, during the normal operation The operation device according to claim 1, wherein a light emission timing of the light emitting unit is controlled.   The operation according to claim 1, wherein the control unit detects an operation characteristic of the light receiving unit when the light receiving unit has not received light for a predetermined time as the predetermined condition. device.   The said control part detects the operating characteristic of the said light-receiving part, when the operation of the operation element with which the said operation device is provided is not detected as said predetermined conditions. The operation device according to claim 1.   The said control part detects the said operation characteristic of the said light-receiving part, when the said predetermined condition is satisfied, and transfers to the power saving mode which reduces the power consumption of the said operation device, It is characterized by the above-mentioned. Item 5. The operation device according to any one of Items 1 to 4.   The control unit detects, as the predetermined condition, that there is no change in the attitude of the operation device for a certain period of time when a battery is inserted into the operation device and an attitude detection sensor that detects the attitude of the operation device. The operation device according to claim 1, wherein the operation characteristic of the light receiving unit is detected in at least one of the cases when the operation is performed. An operation device including a light emitting unit and a light receiving unit, and causing the light emitting unit to emit light in response to light received by the light receiving unit during normal operation; and receiving light emitted from the light emitting unit of the operation device to perform the operation A position detection system comprising: a position detection device that detects a position of the device;
The operation device detects the operating characteristics of the light receiving unit using the light emitting unit when a predetermined condition is satisfied, and controls light emission of the light emitting unit during the normal operation based on a detection result. A position detection system comprising a control unit. The position detection device includes a device light emitting unit that projects light on the operation device,
The control unit performs control to cause the light emitting unit to emit light in synchronization with the timing at which the light received by the position detection device is received by the light receiving unit during the normal operation, and the synchronization timing is The position detection system according to claim 7, wherein correction is performed based on a detection result of operation characteristics of the unit. The position detection device notifies the operation device of the timing of causing the operation device to detect the operation characteristic of the light receiving unit by the device light emitting unit,
The position detection system according to claim 8, wherein the control unit detects an operation characteristic of the light receiving unit at the timing notified from the position detection device as the predetermined condition. A control method of an operation device comprising a light emitting unit and a light receiving unit, and causing the light emitting unit to emit light in response to light received by the light receiving unit during normal operation,
Detecting predetermined operating characteristics of the light receiving unit using the light emitting unit when a predetermined condition is satisfied;
Controlling light emission of the light emitting unit during the normal operation based on the detected operating characteristics;
A method for controlling an operating device, comprising:

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