JP2008139358A - Projector and data transfer system for projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of suppressing a transfer error of data caused by noise from a high-pressure discharge lamp without interrupting communication with an external device. <P>SOLUTION: In the projector having a USB host function, if a USB device is connected before the start of lighting a lamp (S202: Yes), data transfer is started at the highest speed (S211 to 212). If the transfer is not completed (S221: No) when the power supply of the lamp is turned on (S213), the transfer speed is changed to a low speed (S222 to 224). If the transfer is not still completed (S241: No) after the lighting of the lamp is stabilized (S232: Yes), the data transfer is resumed at the highest speed (s242 to 244). This makes it possible to continue the data transfer while suppressing a transfer error caused by the noise coming from the lamp. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projector and a projector data transfer system, and more specifically to a projector having a USB host function and a data transfer system between a projector having a USB host function and a USB device connected to the projector.

2. Description of the Related Art Conventionally, a system is known in which data such as an image displayed on a personal computer is transferred to a projector having a network communication function by using a network represented by a LAN and can be projected. As a light source for such a projector, a high-pressure discharge lamp such as a xenon lamp, a metal halide lamp, or an ultrahigh pressure mercury lamp is often used. By the way, the high pressure discharge lamp is excellent in luminance and life, but requires a high voltage of about 2 kV at the start of lighting. Therefore, the noise generated due to the high voltage may disturb the communication means of the projector or malfunction, resulting in a data transfer error. In view of this, there has been proposed a projector that performs control to stop network communication when the high-pressure discharge lamp is turned on (for example, Patent Document 1). When the projector described in Patent Document 1 starts lighting the high-voltage discharge lamp, it temporarily stops network communication, and at this time, a transfer error caused by noise generated by the high-voltage pulse output from the lighting control means Is to prevent.
JP 2006-106158 A

  However, in the projector described in Patent Document 1, data transfer is not performed at all from the start of lighting of the high-voltage discharge lamp until the completion of the lighting start process, so that it takes time to transfer data as a whole. There was a problem.

  The present invention has been made to solve the above-described problems, and is capable of suppressing a data transfer error caused by noise from a high-pressure discharge lamp without interrupting communication with an external device. It is another object of the present invention to provide a projector data transfer system.

  In order to achieve the above object, a projector according to a first aspect of the present invention is a projector that modulates light emitted from a high-pressure discharge lamp by a light modulation element to form image light, and projects the formed image light. A USB host controller for recognizing and managing a connected USB device and transmitting / receiving data to / from the USB device, and the USB generated due to noise from the high-pressure discharge lamp Transfer error suppression means for suppressing a transfer error in the transmission / reception of the data with the device is provided.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the projector further includes lamp state determination means for determining whether the high-pressure discharge lamp is in a starting, lighting, or extinguishing state. And the transfer error suppression unit sets and changes the transfer rate in the data transmission / reception according to the determination result of the lamp state determination unit.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect of the invention, the transfer error suppression means is in the lamp-off state before the high-pressure discharge lamp is turned off. If the USB host controller recognizes the connection of the USB device, the high-speed discharge lamp is set until the transfer speed is set to the highest speed and the data transmission / reception is started and the data transmission / reception is completed. It is characterized by prohibiting the starting of the.

  According to a fourth aspect of the invention, in addition to the configuration of the second aspect, the transfer error suppressing means determines that the lamp state determining means determines that the high-pressure discharge lamp is in an extinguished state before starting. When the USB host controller recognizes the connection of the USB device, the transfer rate is set to the highest speed to start the data transmission / reception, and the high-pressure discharge lamp is started during the data transmission / reception. In this case, the transfer speed is changed to a low speed.

  According to a fifth aspect of the invention, in addition to the configuration of the second aspect of the invention, the transfer error suppression means is in the lamp state determination means, and the high pressure discharge lamp is in the extinguished state before starting. When the USB host controller recognizes the connection of the USB device, the transfer speed is set to a low speed and transmission / reception of the data is started.

  Furthermore, in the projector according to a sixth aspect of the invention, in addition to the configuration of the invention according to any one of the second to fifth aspects, the transfer error suppressing means is configured such that the USB host controller is connected to the USB device. If the lamp state determination means determines that the high-pressure discharge lamp is stable in a lighting state, the transfer speed is set or changed to the highest speed.

  According to a seventh aspect of the present invention, in addition to the configuration of the second aspect of the present invention, the transfer error suppression means is the lamp state determination means is the lighting state of the high-pressure discharge lamp. When it is determined that the transfer rate is stable, the transfer rate is changed according to the state of occurrence of the transfer error that has occurred.

  According to an eighth aspect of the invention, in addition to the configuration of the seventh aspect of the invention, the transfer error suppression unit changes the transfer speed to a lower speed than the speed required by the USB device. It is characterized by that.

  According to a ninth aspect of the present invention, in addition to the configuration of the seventh or eighth aspect of the invention, a projector for storing the lighting time of the high-pressure discharge lamp and the number of transfer errors that have occurred is provided. And an error occurrence rate calculating means for calculating the transfer error occurrence rate from the lighting time and the number of times stored in the storage means, wherein the transfer error suppressing means is calculated by the error occurrence rate calculating means. The transfer rate is changed based on the occurrence rate.

  According to a tenth aspect of the present invention, there is provided a projector data transfer system comprising: a projector that modulates light emitted from a high-pressure discharge lamp by a light modulation element to form image light; and projects the formed image light. A projector data transfer system comprising a USB device connected to the projector, wherein the projector recognizes and manages the connected USB device, and transmits and receives data to and from the USB device. And a transfer error suppression unit that suppresses a transfer error in data transmission / reception between the USB host controller to be performed and the USB device generated due to noise at the time of starting the high-pressure discharge lamp.

  Furthermore, in addition to the configuration of the invention according to claim 10, the projector data transfer system according to claim 11 is provided with a lighting instruction means for instructing the start of the high-pressure discharge lamp, and the transfer error suppression. Means detects the start instruction by the lighting instruction means, and instructs the connected USB device to set a transfer speed in transmission / reception of the data to a low speed, and the USB device suppresses the transfer error. A speed instruction detecting means for detecting a low speed setting instruction for the transfer speed from the means, and when the speed instruction detecting means detects the low speed setting instruction, the projector is requested to connect at a low speed. And a low speed request means.

  The projector according to the first aspect of the invention includes transfer error suppression means for suppressing a data transfer error in USB communication, which is caused by noise from the high-pressure discharge lamp of the projector. After that, there is no need to cancel the transfer.

  In the projector of the invention according to claim 2, the lamp state determining means determines whether the high-pressure discharge lamp is in the starting, lighting or extinguishing state, and the transfer error suppressing means determines the data transfer rate according to the result. Set and change. Thereby, in addition to the effect of the invention of claim 1, according to the ease of occurrence of noise from the high voltage lamp, the transfer speed is set to a low speed that is strong against noise, or is weak against noise, but the transfer efficiency is reduced. Or high speed.

  In the projector according to the third aspect of the present invention, data transfer is started at the highest speed with the highest transfer efficiency before the high-pressure discharge lamp starts lighting, and at the start of lighting of the high-pressure discharge lamp requiring a high voltage pulse of 2 kV, the transfer is Since it is completed, in addition to the effect of the invention of claim 2, it is possible to reliably prevent a transfer error due to high voltage noise occurring at the time of starting.

  In the projector according to the fourth aspect of the present invention, when the high-pressure discharge lamp is started at the highest speed with the highest transfer efficiency before starting the lighting of the high-pressure discharge lamp, and the high-pressure discharge lamp is started during the data transfer, Change the transfer speed to a lower speed that is less affected. As a result, in addition to the effect of the invention of claim 2, the high-pressure discharge lamp can be started while suppressing a transfer error due to remarkably high voltage noise occurring at the start, and the high-pressure discharge is completed until the data transfer is completed. There is no need to wait for the lamp to start.

  In the projector according to the fifth aspect of the present invention, before the high pressure discharge lamp is turned on, data transfer is started at a low speed that is less susceptible to noise. Thus, in addition to the effect of the invention described in claim 2, even if the data transfer is continued as it is when the high-pressure discharge lamp is subsequently started, the transfer error due to the significant high voltage noise generated at the start is effectively prevented. Can be suppressed.

  In the projector according to the sixth aspect of the invention, when the high-pressure discharge lamp is stable in the lighting state, the transfer speed is set or changed to the maximum speed. Thereby, in addition to the effect of the invention according to any one of claims 2 to 5, it is possible to increase the data transfer efficiency at the time of stable lighting in which high voltage noise is less likely to occur than at the start.

  In the projector according to the seventh aspect of the invention, the transfer rate is changed according to the state of occurrence of the transfer error even after the high-pressure discharge lamp is turned on in a stable state. Although the high-pressure discharge noise is smaller than that at the time of starting, it may occur even when the lighting is stable. By configuring in this way, in addition to the effect of the invention according to any one of claims 2 to 5, Transfer errors when lighting is stable can be effectively suppressed.

  The projector according to the eighth aspect of the invention transfers data at a speed lower than the required speed of the USB device. In a normal USB system, the USB host controller sets a transfer speed according to the maximum supported speed of the USB device. By thus setting the transfer speed to a low speed, the effect of the invention according to claim 7 is achieved. In addition, it is less susceptible to noise and data transfer errors can be suppressed.

  The projector according to the ninth aspect changes the transfer rate based on the transfer error occurrence rate calculated from the number of transfer errors that have occurred and the lighting time of the high-pressure discharge lamp. Since the rate of occurrence of transfer errors depends on environmental factors such as the type of high-pressure discharge lamp and the assembled state, learning errors that occurred during actual use in this way and changing the transfer rate based on the rate of occurrence Thus, in addition to the effects of the invention according to claim 7 or 8, transfer errors can be suppressed in accordance with the current situation.

  In the projector data transfer system according to the tenth aspect of the present invention, transfer error suppression means is provided on the projector side for suppressing data transfer errors in USB communication caused by noise from the high-pressure discharge lamp. Therefore, there is no need to stop the transfer after starting the data transfer with the USB device.

  In the projector data transfer system according to the eleventh aspect, when the start of the high pressure discharge lamp is detected on the projector side and the USB device is instructed to reduce the transfer speed, the USB device side detects this instruction. Requesting the projector to connect at a low speed. In a normal USB system, a transfer speed corresponding to the maximum supported speed of the USB device is set. With this configuration, in addition to the effect of the invention according to claim 10, the transfer speed on the USB device side is set. Can be set to a low speed to make it less susceptible to noise, and data transfer errors can be suppressed.

  Embodiments of the present invention will be described below with reference to the drawings. These drawings are used to explain the technical features that can be adopted by the present invention, and the configuration of the apparatus described, the flow of various processes, etc., unless otherwise specified. It is not intended to be limited to that, but merely an illustrative example.

<First Embodiment>
The projector 100 according to the first embodiment of the present invention will be described below with reference to FIGS. When the projector 100 connects the USB device 200 and writes (transfers) wireless communication setting information (hereinafter referred to as wireless setting information) of the projector 100 to the USB device 200, the projector 100 generates high voltage noise generated from the lamp 172 as a light source. It is characterized by suppressing the transfer error caused.

  First, a schematic configuration of an image projection system 10 using the projector 100 according to the present embodiment will be described with reference to FIG. FIG. 1 is an explanatory diagram showing a schematic configuration of the image projection system 10. In FIG. 1, a USB device 200 is connected to a personal computer (hereinafter abbreviated as “PC”) 300, and image data is transmitted from the PC 300 to the projector 100 via the antenna 233 of the USB device 200 by wireless communication. This represents a state in which an image is projected onto a screen not shown.

  As shown in FIG. 1, the image projection system 10 includes a projector 100 that projects image data input from the outside onto a screen (not shown) separately provided, a PC 300 that transmits image data to the projector 100 through wireless communication, and a USB. The device 200 is configured. The USB device 200 includes a USB connector 222 and can be connected to both the projector 100 and the PC 300. Further, the USB device 200 includes a wireless communication unit 230 (see FIG. 3) compliant with the wireless LAN (Local Area Network) standard. When the USB device 200 is connected to the PC 300 as shown in FIG. Function as. The operation of the entire image projection system 10 will be described later.

  Next, the configuration of the projector 100, the USB device 200, and the PC 300, which are components of the image projection system 10, will be described in order. First, the configuration of the projector 100 will be described with reference to FIG. 1 and FIG. FIG. 2 is a block diagram showing an electrical configuration of projector 100.

  First, the physical configuration of the projector 100 will be described with reference to FIG. As shown in FIG. 1, the projector 100 includes a substantially box-shaped housing 181. A light projecting opening 182 for projecting image light formed as described later on a screen (not shown) is provided on one side surface (front surface) of the housing 181. Further, a USB connector 142 for connecting a USB device such as a USB device 200 described later is provided on the side surface (back surface) opposite to the side where the light projecting opening 182 is provided. An antenna 153 for performing wireless communication is provided upright at one corner on the back side of the top surface of the housing 181, and a power switch 131 is provided at the other corner on the back side.

  Next, the electrical configuration of the projector 100 will be described with reference to FIG. 2, the projector 100 includes a CPU 111, a ROM 112, a RAM 113, an operation panel 121, a power switch 131, a USB host controller 141 to which a USB connector 142 is connected, a wireless communication unit 150, a nonvolatile memory 161, a timer 162, A video signal input circuit 163 and a projection unit 170 are provided, and these are connected to each other via a bus 190. These are all housed in the housing 181.

  The CPU 111 controls the entire projector 100 by reading and executing a program stored in advance in the ROM 112. The RAM 113 includes a storage area for temporarily storing various data used by the CPU 111 during various processes.

  The operation panel 121 is a panel for an operator to perform various operations of the projector 100, and is provided outside the housing 181 (not shown in FIG. 1). When an operator performs operations such as screen setting using the operation panel 121, the CPU 111 executes control according to the operation content.

  The power switch 131 is a switch for supplying power to each component of the projector 100 including a lamp 172, which will be described later, and is provided on the outer upper surface of the housing 181 as shown in FIG.

  The USB host controller 141 and the USB connector 142 connected to the USB host controller 141 constitute a USB interface compliant with the USB (Universal Serial Bus) standard. In a USB system in which devices having a USB interface are connected to each other, only one device called “host” recognizes and manages other devices called “devices” and supervises USB communication (host function). ). The projector 100 has this host function, and when a USB device 200 and other devices having a USB interface are connected via the USB connector 142, the USB host controller 141 is connected to these devices with the USB. Control communication. The USB host controller 141 according to the present embodiment is compatible with the USB 2.0 (high speed) specification, and the data transfer speed is 480 Mbps at the maximum.

  The wireless communication unit 150 includes a wireless control unit 151, a wireless circuit 152, and an antenna 153 that are sequentially connected from the bus 190 side, and transmits and receives data to and from external devices based on the wireless LAN standard. Can do. The radio circuit 152 includes an RF processing unit that modulates and demodulates a radio signal and transmits / receives the radio signal via the antenna 153, a baseband processing unit that performs analog / digital conversion on the baseband signal, and the like. Further, the wireless control unit 151 controls the wireless circuit 152 so that the wireless signal transmitted and received via the antenna 153 becomes a wireless signal conforming to the wireless LAN standard. In the present embodiment, the wireless control unit 151 is composed of a microcomputer.

  The nonvolatile memory 161 is configured by a flash memory or the like. The nonvolatile memory 161 stores wireless setting information such as wireless LAN standard type (band), network mode, network name, SSID (Service Set Identifier), encryption key WEP (Wired Equipment Privacy) key, and IP address. Has been. In addition, the non-volatile memory 161 stores a cumulative lighting time of a lamp 172 described later, the number of transfer errors, and the like.

  The timer 162 measures the cumulative lighting time of the lamp 172 described later. The cumulative lighting time of the lamp 172 is measured in order to determine the replacement time of the lamp 172 in comparison with the service life (lamp life). The accumulated lighting time measured by the timer 162 is stored in the above-described nonvolatile memory 161 every time the power is turned off.

  The video signal input circuit 163 is a circuit used when a video signal such as a composite video signal (for example, NTSC video signal) or a component video signal (for example, RGB signal) is input from the outside via a cable.

  The projecting unit 170 modulates the illumination light from the lamp driving circuit 171, the lamp 172 driven by the lamp driving circuit 171, the illumination optical system 173 on which the light from the lamp 172 first enters, and the image light by modulating the illumination light from the illumination optical system. An LCD 174 to be formed, an imaging optical system 175 for projecting image light from the LCD 174 to the screen, an image processing circuit 176, an LCD driving circuit 177 for driving the LCD 177 based on a signal from the image processing circuit 176, and an imaging optical system 175 A focus adjusting mechanism 178 for performing focusing is provided.

  The lamp driving circuit 171 is connected to the bus 190 and turns on / off the lamp 172 in accordance with an instruction from the CPU 111. The lamp 172 is a high pressure discharge lamp used as a light source. Specifically, a xenon lamp, a metal halide lamp, an ultrahigh pressure mercury lamp, or the like can be used.

  The illumination optical system 173 includes an illumination lens (not shown) for making the light emitted from the lamp 172 parallel light and entering the LCD 117.

  An image processing circuit 176 connected to the bus 190 processes a video signal input to the video signal input circuit 163 or a signal of image data received from the outside by the wireless communication unit 150 in accordance with an instruction from the CPU 111. Then, the processed video signal is input to the LCD drive circuit 177. The LCD drive circuit 177 drives the LCD 174 connected to the LCD drive circuit 177 based on the input processed video signal.

  The LCD 174 is a color liquid crystal panel incorporating a color filter, and is driven by the LCD drive circuit 177 to display an image, while being illuminated by the illumination optical system 173. The LCD 174 modulates the illumination light from the illumination optical system 173, forms image light of the displayed image, and emits the image light to the imaging optical system 175.

  The imaging optical system 175 includes a projection lens, and projects the image light formed by the LCD 174 onto a separately provided screen through a light projecting opening 182 (see FIG. 1) provided in the housing 181 of the projector 100. To do. Note that a focus adjustment mechanism 178 controlled by the CPU 111 via the bus 190 is connected to the imaging optical system 175, and the focus of the image projected on the screen can be adjusted.

  Next, the configuration of the USB device 200 will be described with reference to FIG. 1 and FIG. FIG. 3 is a block diagram showing an electrical configuration of the USB device 200.

  First, the physical configuration of the USB device 200 will be described with reference to FIG. As shown in FIG. 1, the USB device 200 is a small device that has a substantially box-shaped housing and is convenient to carry. A USB connector 222 projects from one side of the housing, and can be connected to a USB device such as the projector 100 described above. Further, an antenna 233 for wireless communication is projected.

  Next, the electrical configuration of the USB device 200 will be described with reference to FIG. As shown in FIG. 3, the USB device 200 includes a CPU 211, a ROM 212, a RAM 213, a USB device controller 221 to which a USB connector 222 is connected, a wireless communication unit 230, and a memory controller 251 to which a flash memory 260 is connected. Are connected to each other via a bus 290. These are all housed inside the housing.

  The CPU 211 controls the entire USB device 200 by reading and executing a program stored in advance in the ROM 212. The ROM 212 stores identification information (for example, a MAC address) of the USB device 200. Based on the control of the CPU 211, the identification is sent to the projector 100 and the PC 300 via the USB device controller 221 and the USB connector 222 described later. Information can be sent. The RAM 213 includes a storage area that temporarily stores various data used by the CPU 211 during various processes.

  The USB connector 222 connected to the USB device controller 221 and the USB device controller 221 constitutes a USB interface compliant with the USB standard. The USB device 200 is a device that is positioned as a “device” in the USB system. When connected to another device (host) having a host function, the USB device 200 can perform USB communication under the control of the host. In the present embodiment, since the projector 100 and the PC 300 described later have a host function, the USB device controller 221 is connected to the USB device controller 141 (see FIG. 2) of the projector 100 or the host controller of the PC 300. Under the control of 321 (see FIG. 4), wireless setting information is transmitted / received to / from them. This process will be described in detail later. The USB device controller 221 according to the present embodiment is compatible with the USB 2.0 specification (high speed), and the transfer speed is 480 Mbps at the maximum.

  The wireless communication unit 230 includes a baseband unit 231, an RF unit 232, and an antenna 233, and can transmit and receive data to and from an external device based on the wireless LAN standard. In the present embodiment, the baseband unit 231 and the RF unit 232 are configured by a single WLAN (Wireless Local Area Network) chip.

  The memory controller 251 controls access from an external USB host device connected via the USB connector 222 to the flash memory 260 connected to the memory controller 251. The flash memory 260 is provided with a removable area 261 recognized as a removable memory and a CD-ROM recognized as a CD-ROM. When a normal USB memory is connected to an external USB host device, it is recognized as one device device. However, in the USB device recognition process called “enumeration”, which will be described later, when the memory controller 251 receives an inquiry about the device type from the USB host device, the memory controller 251 returns two device types, a removable memory and a CD-ROM. This causes the USB host device to recognize the removable area 261 of the flash memory 260 as a removable memory and also recognize the CD-ROM area 262 as a CD-ROM. That is, the USB device 200 can be recognized as if it were two device devices.

  In a removable area 261 of the flash memory 260, wireless setting information described later is stored. On the other hand, the CD-ROM area 262 stores various application programs, device drivers, and installers.

  The application programs stored in the CD-ROM area 262 include a wireless setting application, an image transmission application, and the like. The wireless setting application causes the PC 300 to execute processing for setting the wireless setting information written in the removable area 261 of the flash memory 260 from the projector 100 to the USB device 200 by being installed in the PC 300. The image transmission application is installed in the PC 300 to control the USB device 200 and execute processing for transmitting image data stored in the PC 300 to the projector 100 through wireless communication. The device driver is a program for causing the PC 300 to control the wireless communication unit 230 of the USB device 200 by being installed in the PC 300. The installer is executed by the auto-run function of the PC 300, and automatically installs the above-described wireless setting application and image transfer application and the device driver for controlling the wireless communication unit 230 in the PC 300. These processes will be described later.

  Next, the configuration of the PC 300 will be described with reference to FIG. FIG. 4 is a block diagram showing an electrical configuration of the PC 300.

  The PC 300 includes a CPU 311, a ROM 312, a RAM 313, a bus controller 314, a graphics controller 315 to which a liquid crystal display (hereinafter abbreviated as LCD) 316 is connected, and a USB host controller 321 to which a USB connector 322 is connected. Are connected to each other by a first bus 390. The PC 300 further supports a hard disk 331 for storing various programs and data, a flexible disk (FD) drive 332, a DVD / CD drive 333, a keyboard 334 and a mouse 335 for input operations, and 10-BASE and 100BASE-TX. The LAN interface 336 is connected via a second bus 391. The bus controller 314 is also connected to the second bus, and controls data exchange between the first bus 390 and the second bus 391.

  The CPU 311 controls the entire PC 300 by reading and executing a program stored in advance in the ROM 312. The ROM 312 stores various programs including an operating system (hereinafter abbreviated as OS). The RAM 313 includes a storage area or the like that temporarily stores various data used by the CPU 311 during various processes. When the power of the PC 300 is turned on, the CPU 311 first reads the OS from the ROM 312 and executes it. Thereby, the basic functions of the PC 300 including the input / output functions of the keyboard 334 and the mouse 335, the display function of the LCD 316, and the management of memories such as the ROM 312, RAM 313, and HD 331 can be executed.

  The graphics controller 315 performs processing for displaying an image or the like on the LCD 315 as a display unit.

  The USB host controller 321 and the USB connector 322 connected to the USB host controller 321 constitute a USB interface compliant with the USB standard. That is, the PC 300 is a host device in the USB system, similar to the projector 100 described above. When the USB device 200 is connected, data is transmitted / received between the two under the control of the USB host controller 321. Note that the USB host controller 321 corresponds to the USB 2.0 specification (high speed), and the transfer speed is 480 Mbps at the maximum.

  Next, with reference to FIG. 1 and FIGS. 5 to 7, the wireless information setting and the image projecting operation of the image projecting system 10 will be described. 1, 5 and 6 are explanatory diagrams of the operation of the image projection system 10. Specifically, FIG. 1 illustrates a state in which the USB device 200 is connected to the PC 300 and image data is transmitted from the PC 300 to the projector 100 by wireless communication. FIG. 5 illustrates the USB device 200 connected to the projector 100. FIG. 6 shows a state where the wireless setting information is written from the projector 100 to the USB device 200. FIG. 6 shows that the USB device 200 is connected to the PC 300, and the wireless setting information written to the USB device 200 is further written to the PC 300. Represents a state. FIG. 7 is a flowchart of the operation process of the projector 100 shown in FIG.

  In the image projection system 10, the projector 100 and the PC 300 transmit and receive image data by wireless communication. For this reason, the wireless information must be set in advance based on, for example, the wireless LAN standard. Therefore, first, as shown in FIG. 5, the USB connector 222 of the USB device 200 is connected to the USB connector 142 of the projector 100, and the wireless setting information stored in the projector 100 is written into the USB device 200. The operation processing of the projector 100 including the wireless setting information writing processing executed by the CPU 111 of the projector 100 will be described in detail below with reference to the flowchart of FIG. The operation process of the projector 100 is performed by the CPU 111 loading the control program stored in the ROM 112 into the RAM 113 and executing it.

  The wireless information writing process is started when a power cable (not shown) of the projector 100 is inserted into an outlet and turned on. First, the CPU 111 performs initialization processing of the USB host controller 141 and the RAM 113 (S101). Thereafter, when the USB device 200 is connected to the USB connector 142, the CPU 111 detects the connection via the USB host controller 141 (S102). Then, recognition processing (enumeration) of the USB device 200 is performed between the USB host controller 141 and the USB device controller 221 of the USB device 200, and the USB device 200 is connected at the maximum speed (480 Mbps) (S111). .

  Specifically, enumeration and connection processing are performed according to the following procedure. First, the USB host controller 141 that has detected the connection of the USB device 200 holds a reset signal in which the two signal lines D + and D− are both zero (0) for 10 ms. Here, the projector 100 and the USB device 200 are high-speed (HS) compatible devices as described above. Therefore, the USB device controller 221 that has detected this reset signal first pulls up the D + line temporarily to bring it into the same state as a USB 1.1 specification (full speed) compatible device. After that, an operation called “device chirp” for driving the D + line and the D− line to the K state is performed. As a result, the USB host controller 141 is notified that the USB device 200 is an HS-compatible device. Upon receiving the device Chirp, the USB host controller 141 repeats an operation called “hub chirp” that alternately drives the D + line and the D− line in the K state and the J state when the device Chirp ends. In this way, when the USB host controller 141 and the USB device controller 221 confirm the device Chirp and the hub Chirp, the communication between the two is set to the highest speed HS mode (480 Mbps).

  After the above processing is performed while the reset signal is held for 10 ms, the USB device controller 221 enters a default state, and data is exchanged with the USB host controller 141 through the default pipe (connection path) using the default address. It becomes possible. Then, the USB device controller 221 returns a device descriptor including identification information such as the vendor ID and product ID of the USB device 200 in response to a request from the USB host controller 141. At this time, the memory controller 251 (see FIG. 3) of the USB device 200 returns the two device types of the removable memory and the CD-ROM in parallel, and uses the removable area 261 of the flash memory 260 as the removable memory. At the same time, the CD-ROM area 262 is recognized as a CD-ROM. The USB host controller 141 assigns a specific address to the USB device 200 based on the device descriptor, and acquires and recognizes detailed configuration information of the USB device 200 again using another descriptor. In this way, the USB device 200 is ready for use.

  As described above, when the connection with the USB device 200 is established (S111), writing of wireless setting information from the projector 100 to the USB device 200 is started under the control of the USB host controller 141 (S112). . As described above, the transfer speed at this time is 480 Mbps, which is the maximum speed supported by the projector 100 and the USB device 200. First, the CPU 111 once reads out the wireless setting information stored in the nonvolatile memory 161 (see FIG. 2) of the projector 100 to the RAM 113. Then, the data is written into the removable area 261 (see FIG. 3) of the flash memory 260 of the USB device 200 via the USB host controller 141 and the USB device controller 221.

  When the CPU 111 starts writing the wireless setting information (S112), even if the power switch 131 (see FIGS. 1 and 2) of the projector 100 is pressed, the CPU 111 does not permit input of power (S113). This state is continued while the writing of the wireless setting information is not completed (S114: No to S113). After the writing is completed (S114: Yes), when the USB device 200 is not connected (S102: No), the processing of S102 to S114 described above is performed until the power switch 131 is turned on (S121: No). When the power switch 131 is repeatedly turned on (S121: Yes), the lamp 172 (see FIG. 2) is turned on (S122), and an image input from the outside via the video signal input circuit 163 (see FIG. 2). Alternatively, an image received from the outside by the wireless communication unit 150 (see FIG. 2) is projected from the imaging optical system 175 (see FIG. 2) onto the screen (S123). Then, the CPU 111 continues monitoring until the power switch 131 is turned off (S131: No). When the power switch 131 is turned off (S131: Yes), the lamp 172 is turned off (S132), and the end process is completed. (S133) to complete the operation process of the projector 100.

  As described above, when the writing of the wireless setting information from the projector 100 to the USB device 200 is completed, the USB device 200 is removed from the projector 100 and connected to the USB connector 322 of the PC 300 as shown in FIG. Then, the USB host controller 321 (see FIG. 4) of the PC 300 performs recognition processing (enumeration) in the same manner as the USB host controller 141 of the projector 100 to make the USB device 200 usable. Then, the CPU 311 recognizes the CD-ROM area 262 of the flash memory 262 as a CD-ROM by the function of the memory controller 251 of the USB device 200, and the installer stored in the CD-ROM area 262 is stored in the PC 300 by the auto-run function. install. Further, using the installer, the device driver is installed in the PC 300 together with the wireless setting application and the image transmission application that are also stored in the CD-ROM area 262.

  Thereafter, the CPU 311 activates the installed wireless setting application, and reads the wireless setting information written in the removable area 261 of the USB device 200 from the projector 100 to the RAM 313 as described above. Then, the CPU 311 sets a wireless LAN network for the USB device 200 according to the wireless setting information via the USB host controller 321 and the USB device controller 221. When this process is completed, the wireless setting information of the projector 100 and the USB device 200 matches.

  Thereafter, the CPU 311 activates an image transmission application, and transmits the image data stored in the PC 300 to the projector 100 via the wireless communication unit 230 of the USB device 200 as shown in FIG. The projector 100 projects the received image data from the imaging optical system 175 (see FIG. 2) through the projection opening 182 to a screen (not shown).

  As described above, in the present embodiment, at the same time as the USB device 200 is connected to the projector 100, writing of the wireless setting information is started at the maximum speed of 480 Mbps, and the lamp 172 is turned on until the writing is completed. Is not accepted. As a result, it is possible to reliably avoid the occurrence of a transfer error due to the malfunction of the USB host controller 141 or the like due to the high voltage noise generated when the lamp 172 is turned on.

  In the present embodiment, the CPU 111 of the projector 100 that performs the processes from S102 to S114 in FIG. 7 corresponds to the “transfer error suppressing unit” according to the present invention. Further, the CPU 111 that performs the processing of S121 and S131 of FIG. 7 corresponds to the “lamp state determination means” of the present invention.

<Second Embodiment>
Next, a second embodiment will be described with reference to FIG. As will be described in detail below, the projector 100 according to the present embodiment performs a data transfer error suppression process different from the first embodiment in the wireless setting information writing process. In the present embodiment, the operations of the image projection system 10 other than the configuration of the projector 100, the USB device 200, and the PC 300, and the wireless setting information writing process are the same as those in the first embodiment, and thus the description thereof is omitted. .

  FIG. 8 is a flowchart of the operation process of the projector 100 according to the present embodiment. As shown in FIG. 8, the wireless information writing process is started when a power cable (not shown) of the projector 100 is inserted into an outlet and turned on. First, the CPU 111 performs initialization processing of the USB host controller 141 and the RAM 113 (S201). Thereafter, when the USB connector 222 is connected to the projector 100, the CPU 111 detects the connection via the USB host controller 141 (S202: Yes). Then, recognition processing (enumeration) of the USB device 200 is performed between the USB host controller 141 and the USB device controller 221, and the USB device 200 is connected at the maximum speed (480 Mbps) (S211). The enumeration and connection processing procedures are the same as those in the first embodiment.

  Next, under the control of the USB host controller 141, writing of wireless setting information from the projector 100 to the USB device 200 is started (S212). Thereafter, the CPU 111 continues monitoring while the power switch 131 is OFF (S213: No). When the power switch 131 is turned ON (S213: Yes), writing of the wireless setting information to the USB device 200 is completed. It is determined whether it has been done (S221).

  When the CPU 111 determines that the writing is not completed (S221: No), the writing of information is stopped before the lamp 172 is started and high voltage noise is generated (S222). Then, it reconnects to the USB device 200 at this time through the USB host controller 141 (S223). Specifically, the USB host controller 141 starts reconnection by issuing a reset command as in the first connection. However, here, even when the USB device controller 221 performs device Chirp when setting the communication mode (transfer speed) performed between the USB host controller 141 and the USB device controller 221, the USB host controller 141 responds with the hub Chirp. do not do. As a result, the communication speed between the USB host controller 141 and the USB device controller 221 is set to the full speed (FS) mode (12 Mbs) of the USB 1.1 specification.

Thereafter, the CPU 111 starts writing wireless setting information from the projector 100 to the USB device 200 via the USB host controller 141 (S224), and turns on the lamp 172 (S231). On the other hand, when the power switch 131 is turned on (S213: Yes), if the wireless setting information has already been written (S221: Yes), the CPU 111 turns on the lamp 172 as it is (S231). After the lamp 172 is turned on (S231), the CPU 111 monitors whether the lamp 172 has reached a stable state. Specifically, the determination whether or not a predetermined time (stable time) has elapsed since the power switch 131 is turned on is repeated (S232: No). Note that the generation time of significant high-voltage noise that occurs after the start of lighting can be predicted empirically from the type of high-pressure discharge lamp used in the projector 100 and the like, and this generation time is set as a stable time in the nonvolatile memory 161 in advance. Just remember.

  If it is determined that the stable time of the lamp 172 has elapsed (S232: Yes), the CPU 111 determines again whether the writing of the wireless setting information has been completed (S241). If the writing has not been completed (S241: No), the writing is temporarily stopped (S242), and the USB device 200 is connected again at the highest speed of 480 Mbps via the USB host controller 141 (S243). Specifically, after the USB host controller 141 issues a reset command in accordance with an instruction from the CPU 111, the USB device controller 221 performs device Chirp, and the USB host controller 141 that receives the device Chirp performs hub Chirp. Communication is again set to the fastest HS mode (480 Mbps). Then, writing of information at the highest speed from the projector 100 to the USB device 200 is started (S244). Further, an image input from the outside via the video signal input circuit 163 or an image received from the outside by the wireless communication unit 150 is projected from the imaging optical system 175 onto the screen (S251). When the stable time of the lamp 172 has elapsed (S232: Yes), if the writing of the wireless setting information is completed (S241: Yes), the image is projected as it is (S251).

  On the other hand, after the initialization process (S201), when the CPU 111 does not detect the connection of the USB device 200 to the projector 100 (S202), when the power switch 131 is turned on (S205: Yes), the CPU 111 keeps the lamp as it is. 172 is turned on (S206), and an image input from the outside via the video signal input circuit 163 or an image received from the outside by the wireless communication unit 150 is projected onto the screen (S251). When the power switch 131 is OFF (S205: No), the process returns to the determination process of whether or not the USB device 200 is connected (S202).

  After starting the image projection, the CPU 111 continues monitoring until the power switch 131 is turned off (S252: No). When the power switch 131 is turned off (S252: Yes), the lamp 172 is turned off (S253). Then, an end process is performed (S254), and the operation process of the projector 100 is completed.

  As described above, in the present embodiment, at the same time when the USB device 200 is connected to the projector 100, writing of the wireless setting information is started at the maximum speed of 480 Mbps, and the lamp 172 is started before the writing is completed. In this case, the transfer speed is changed to a low speed of 12 Mbps. Generally, the noise generated by the high-pressure discharge lamp is often induced by a high voltage pulse (about 2 kV) at the start of lighting, and the noise at this time is extremely large. On the other hand, USB communication has a characteristic that it is weak against noise as the transfer speed is high, and is less susceptible to noise as the transfer speed is low. Therefore, as in the projector 100 according to the present embodiment, before the lamp 172 that does not generate noise is turned on (when the lamp is turned off), data transfer is performed at the highest speed with the highest transfer efficiency, and at the start of lighting when noise appears noticeably. By transferring data at low speed, which is stronger than noise, data transfer errors caused by high voltage noise can be effectively suppressed.

  Furthermore, in the projector 100 according to the present embodiment, even if the lighting of the lamp 172 reaches a stable state, if the writing of the wireless setting information is not yet completed, the transfer speed is changed again to the maximum speed of 480 Mbps. It is known that the noise generated by the high-pressure discharge lamp is greatly reduced after a certain period of time has elapsed since the start of lighting. Therefore, after the lighting state of the lamp 172 is stabilized, the transfer efficiency can be increased by performing data transfer again at the highest speed.

  In this embodiment, the CPU 111 of the projector 100 that performs the processes of S202, S211 to S212, S221 to S224, and S241 to S244 in FIG. 8 corresponds to the “transfer error suppressing unit” according to the present invention. Further, the CPU 111 that performs the processes of S205, S213, S232, and S252 in FIG. 8 corresponds to the “lamp state determination unit” of the present invention.

<Third Embodiment>
Next, a third embodiment will be described with reference to FIG. As will be described in detail below, the projector 100 according to the present embodiment is characterized by performing a data transfer error suppression process different from the first and second embodiments in the wireless setting information writing process. is there. In the present embodiment, the operations of the image projection system 10 other than the configuration of the projector 100, the USB device 200, and the PC 300, and the wireless setting information writing process are the same as those in the first embodiment, and thus the description thereof is omitted. .

  FIG. 9 is a flowchart of an operation process of the projector 100 according to the present embodiment. As shown in FIG. 9, the wireless information writing process is started when a power cable (not shown) of the projector 100 is inserted into an outlet and turned on. First, the CPU 111 performs initialization processing of the USB host controller 141 and the RAM 113 (S301). Thereafter, when the USB device 200 is connected to the USB connector 142, the CPU 111 detects the connection via the USB host controller 141 (S302: Yes). Then, recognition processing (enumeration) of the USB device 200 is performed between the USB host controller 141 and the USB device controller 221 of the USB device 200, and the USB device 200 is connected at a low speed (12 Mbps) (S311). That is, after the USB device 200 performs device Chirp, the USB host controller 141 does not perform hub Chirp, thereby setting communication in the FS mode. Then, under the control of the USB host controller 141, writing of wireless setting information from the projector 100 to the USB device 200 is started (S312).

  Thereafter, the CPU 111 continues monitoring while the power switch 131 is OFF (S313: No), and when the power switch 131 is turned ON (S313: Yes), the lamp 172 is turned on (S321). Then, the CPU 111 repeats the determination of whether or not the time since the power switch 131 is turned on exceeds the stable time stored in the nonvolatile memory 161 until the stable time elapses (S322: No).

  If it is determined that the stable time of the lamp 172 has elapsed (S322: Yes), the CPU 111 determines again whether the writing of the wireless setting information has been completed (S331). If the writing has not been completed (S331: No), the writing is temporarily stopped (S332), and the USB device 200 is reconnected to the USB device 200 at the maximum speed of 480 Mbps through the USB host controller 141 (S333). . Specifically, after the USB host controller 141 issues a reset command in accordance with an instruction from the CPU 111, the USB device controller 221 performs device Chirp, and the USB host controller 141 that receives the device Chirp performs hub Chirp. Communication is set again to the fastest HS mode (480 Mbps). Then, information writing at the highest speed from the projector 100 to the USB device 200 is started (S334). Then, an image input from the outside via the video signal input circuit 163 or an image received from the outside by the wireless communication unit 150 is projected from the imaging optical system 175 onto the screen (S341). Further, when the stable time of the lamp 172 has elapsed (S322: Yes), if the writing of the wireless setting information is completed (S331: Yes), the image is projected as it is (S341).

  On the other hand, after the initialization process (S301), when the CPU 111 does not detect the connection of the USB device 200 to the projector 100 (S302), when the power switch 131 is turned on (S305: Yes), the CPU 111 keeps the lamp as it is. 172 is turned on (S306), and an image input from the outside via the video signal input circuit 163 or an image received from the outside by the wireless communication unit 150 is projected onto the screen (S341). If the power switch 131 is OFF (S305: No), the process returns to the determination process of whether or not the USB device 200 is connected (S302).

  After starting the image projection, the CPU 111 continues monitoring until the power switch 131 is turned off (S342: No). When the power switch 131 is turned off (S342: Yes), the lamp 172 is turned off (S343). Then, an end process is performed (S344), and the operation process of the projector 100 is completed.

  As described above, in the present embodiment, after the USB device 200 is connected to the projector 100, the writing of the wireless setting information is started at a low speed of 12 Mbs, and the lamp 172 is turned on and reaches a stable state. The transfer rate is changed to the highest speed of 480 Mbps. If the USB device 200 is connected to the projector 100 before the lamp 172 is turned on (when the lamp 172 is turned off), the lamp 172 is very likely to be started for image projection thereafter. Therefore, if writing is started at a low speed unlikely to be affected by noise from the beginning as in this embodiment, even if the lamp 172 is started before writing is completed, it is necessary to temporarily stop data transfer and reconnect. Absent. The transfer efficiency can be increased by reconnecting at the highest speed after the stable time when the occurrence of high voltage noise is reduced and continuing the data transfer.

  In the present embodiment, the CPU 111 of the projector 100 that performs the processes of S302, S311 to S312 and S331 to S334 in FIG. 9 corresponds to the “transfer error suppressing unit” of the present invention. Further, the CPU 111 that performs the processes of S305, S313, S322, and S342 in FIG. 9 corresponds to the “lamp state determination unit” of the present invention.

<Fourth embodiment>
Next, a fourth embodiment will be described with reference to FIGS. 10 and 11. As will be described in detail below, the projector 100 according to the present embodiment performs a data transfer error suppression process at the start of lighting of the lamp 172 in the wireless setting information writing process, as in the first to third embodiments. At the same time, the data transfer error suppression process is performed even after the lamp 172 reaches a stable state. In the present embodiment, the operations of the image projection system 10 other than the configuration of the projector 100, the USB device 200, and the PC 300, and the wireless setting information writing process are the same as those in the first embodiment, and thus the description thereof is omitted. .

  10 and 11 are flowcharts of the operation process of the projector 100 according to the present embodiment. As shown in FIG. 10, the wireless information writing process is started when a power cable (not shown) of the projector 100 is inserted into an outlet and turned on. First, the CPU 111 performs initialization processing of the USB host controller 141 and the RAM 113 (S401). Thereafter, when the USB device 200 is connected to the USB connector 142, the CPU 111 detects the connection via the USB host controller 141 (S402: Yes). Then, recognition processing (enumeration) of the USB device 200 is performed with the USB device controller 221 of the USB device 200, and the USB device 200 is connected at the maximum speed (480 Mbps) (S411). Here, communication in the HS mode is set by the USB host controller 141 and the USB device controller 221 confirming the device Chirp and the hub Chirp with each other.

  Next, under the control of the USB host controller 141, writing of wireless setting information from the projector 100 to the USB device 200 is started (S412). Thereafter, the CPU 111 continues monitoring while the power switch 131 is OFF (S413: No), and when the power switch 131 is turned ON (S413: Yes), writing of the wireless setting information to the USB device 200 is completed. It is determined whether or not (S421).

  When the CPU 111 determines that the writing has not been completed (S421: No), the writing of information is stopped before the lamp 172 starts and high voltage noise is generated (S422), and the USB host controller 141 is used. This time, the USB device 200 is reconnected at a low speed (12 Mbps) (S423). That is, after the USB device 200 performs device Chirp, the USB host controller 141 does not perform hub Chirp, thereby setting the communication mode to the FS mode.

Thereafter, the CPU 111 starts writing wireless setting information from the projector 100 to the USB device 200 via the USB host controller 141 (S424), and turns on the lamp 172 (S431). On the other hand, when the power switch 131 is turned on (S413: Yes), if the writing of the wireless setting information has already been completed (S421: Yes), the CPU 111 turns on the lamp 172 as it is (S431). After the lamp 172 is turned on (S431), the CPU 111 monitors whether or not the stable time of the lamp 172 has elapsed (S432: No).

  If it is determined that the stable time of the lamp 172 has elapsed (S432: Yes), the CPU 111 determines again whether the writing of the wireless setting information has been completed (S441). If the writing has not been completed (S441: No), the writing is temporarily stopped here (S442), and the USB device 200 is again connected to the USB device 200 at the highest speed of 480 Mbps through the USB host controller 141 (S443). Specifically, after the USB host controller 141 issues a reset command in accordance with an instruction from the CPU 111, the USB device controller 221 performs device Chirp, and the USB host controller 141 that receives the device Chirp performs hub Chirp. Communication is again set to the fastest HS mode (480 Mbps). Then, the wireless setting information writing from the projector 100 to the USB device 200 at the highest speed is started (S444). Then, an image input from the outside via the video signal input circuit 163 or an image received from the outside by the wireless communication unit 150 is projected from the imaging optical system 175 onto the screen (S451). In addition, when the stable time of the lamp 172 has elapsed (S432: Yes), if the writing of the wireless setting information is completed (S441: Yes), the image is projected as it is (S451).

  On the other hand, after the initialization process (S401), when the CPU 111 does not detect the connection of the USB device 200 to the projector 100 (S402), when the power switch 131 is turned on (S405: Yes), the CPU 111 keeps the lamp as it is. 172 is turned on (S406), and an image input from the outside via the video signal input circuit 163 or an image received from the outside by the wireless communication unit 150 is projected onto the screen (S451). If the power switch 131 is OFF (S405: No), the process returns to the determination process of whether or not the USB device 200 is connected (S402).

  By the way, the timer 162 (see FIG. 2) provided in the projector 100 is used for determining the life of the lamp 172. Therefore, the lighting time is counted up every time the power switch 131 is turned on since the projector 100 is first used. When the power switch 131 is turned off, the accumulated lighting time at that time is stored in the nonvolatile memory 161. When the power switch 131 is turned on again, the CPU 111 reads the accumulated lighting time stored in the nonvolatile memory 161, and the timer 162 continues to count up. When the CPU 111 starts projecting an image (FIG. 10, S451), as shown in FIG. 11, the CPU 162 acquires the cumulative lighting time of the lamp 172 currently measured by the timer 162 (S452), and this cumulative lighting time is stored in a nonvolatile manner. Is stored in the memory 161 (S453).

  At this time, it is determined whether the USB device 200 is connected to the projector 100 (S461). When the CPU 111 detects that a transfer error has occurred via the USB host controller 141 (S461: Yes) when the USB device 200 is connected (S461: Yes), the transfer stored in the non-volatile memory 161 is performed. The number of errors is read and counted up (S472), and the counted number of transfer errors is stored again in the nonvolatile memory 161 (S473). Since the number of transfer errors counted up in this way is stored in the nonvolatile memory 161 every time the wireless setting information is written, the cumulative transfer error since the projector 100 was first used is stored. The number of times is stored.

  In this way, after the transfer error count is stored (S473) or when no transfer error is detected (S471: No), if the wireless setting information is still being written to the USB device 200 (S481: No), As described above, the CPU 111 reads the lighting time of the lamp 172 and the number of transfer errors stored in the nonvolatile memory 161 to the RAM 113, and calculates the transfer error occurrence rate by dividing the number of transfer errors by the lighting time. (S482). Note that this threshold value may be determined in advance as the number of transfer errors per unit time that is allowable, and the value stored in the nonvolatile memory 161 may be read into the RAM 113 for comparison.

  If the CPU 111 determines that the occurrence rate of the transfer error is less than the threshold (S482: No), the transfer error is within the allowable range, so the writing is continued as it is (S487). The transfer speed at this time is the highest speed (480 Mbps) set when the lighting of the lamp 172 is stabilized (FIG. 10, S443). On the other hand, if the occurrence rate is equal to or greater than the threshold (S482: Yes), if the transfer is continued at the highest speed, there is a high possibility that a transfer error will occur. Therefore, the writing of the wireless setting information is temporarily stopped (S483). . Then, the connection is reset via the USB host controller 141, and the USB host controller 141 does not respond to the device Chirp of the USB device controller 221 with the hub Chirp, thereby performing reconnection in the low speed (FS) mode (S484). When reconnection is established, writing is resumed at a low speed (12 Mbps) (S485).

  After the image projection (FIG. 10, S451), if the connection of the USB device 200 is not detected (S461: No), the writing of the wireless setting information to the USB device 200 is completed (S481: Yes), or as described above In any case where writing is continued (S485, S487), the processing from S452 to S485 described above is repeated until the power switch 131 is turned off (S491: No). When the power switch 131 is turned off (S491: Yes), the CPU 111 turns off the lamp 172 (S492), performs an end process (S493), and completes the operation process of the projector 100.

  As described above, in the projector 100 according to the present embodiment, the process similar to that of the second embodiment is performed from before the lamp 172 is started until it reaches the stable state, and the lamp 172 reaches the stable state. After that, when the transfer error occurrence rate is equal to or higher than the threshold value, processing for changing the transfer rate to a low speed is performed. Generally, high-voltage noise leads to a serious transfer error at the start of lighting of the high-pressure discharge lamp, but in reality, depending on the type of the high-pressure discharge lamp and the assembled state, the noise will remain even after the lighting state has stabilized. May occur and cause a transfer error. Therefore, like the projector 100 according to the present embodiment, the error actually generated in the stable state of the lamp 172 is learned, and the transfer rate is changed based on the occurrence rate, thereby suppressing the transfer error in accordance with the current situation. It can be performed.

  In this embodiment, the CPU 111 of the projector 100 that performs the processes of S402, S411 to S412, S421 to S424, S441 to S444 in FIG. 10 and S461, S471 to S473, and S481 to S487 in FIG. This corresponds to “transfer error suppression means”. Further, the CPU 111 that performs the processes of S405, S413, and S432 in FIG. 10 and S491 in FIG. 11 corresponds to the “lamp state determination unit” of the present invention. Further, the non-volatile memory 161 of the projector 100 corresponds to the “storage unit” of the present invention, and the CPU 111 that performs the processing of S482 in FIG. 11 corresponds to the “error occurrence rate calculation unit” of the present invention.

<Fifth Embodiment>
Next, a data transfer system 1 including the projector 101 and the USB device 201 according to the fifth embodiment will be described with reference to FIGS. FIG. 12 is an explanatory diagram showing a schematic configuration of the data transfer system 1. FIG. 13 is a block diagram showing an electrical configuration of the projector 101, and FIG. 14 is a block diagram showing an electrical configuration of the USB device 201. 15 to 17 are partial cross-sectional views for explaining the speed instruction operation from the projector 101 to the USB device 201 when the USB device 200 is connected to the projector 101. 18 and 19 are flowcharts of wireless setting information transfer processing in the data transfer system 1. In the projector 101 and the USB device 201, the same reference numerals are given to the same components as those of the projector 100 and the USB device 200 according to the first embodiment, and description thereof will be omitted.

  First, a schematic configuration of the data transfer system 1 and the image projection system 11 including the data transfer system 1 will be described with reference to FIG. As shown in FIG. 12, the data transfer system 1 includes a projector 101 and a USB 201, connects the USB device 201 to the projector 101, and transfers (writes) the wireless setting information stored in the projector 101 to the USB device 201. ) Thereafter, the USB device 201 in which the wireless setting information is written is detached from the projector 101 and connected to the PC 300, wireless information is set by the PC 300, and image data is transmitted to the projector 101 as a wireless unit of the PC 300. An image is projected from the projector 101 onto a screen provided separately. Thus, the projector 101, the USB device 201, and the PC 300 constitute the image projection system 11. Since the configuration of the PC 300 and the operation of the image projection system 11 other than the wireless setting information transfer process in the data transfer system 1 are the same as those in the first embodiment, detailed description thereof is omitted below.

  Next, the configuration of the projector 101 will be described with reference to FIGS. 13 and 15. As shown in FIG. 15, the projector 101 includes a speed instruction switch 165 connected to the power switch 131 in addition to the configuration of the projector 100 according to the first embodiment. The speed instruction switch 165 is a switch for detecting that the power switch 131 is turned on and instructing the USB device 200 to make a connection request at a low speed. As shown in FIG. 17, the housing 181 of the projector 101 is provided with a USB device insertion slot 143 that is a recess into which the USB device 201 is fitted, and the USB connector 222 of the USB device 201 is provided on the bottom surface of the recess. Is connected (a connection terminal is not shown). A pin-shaped speed instruction switch 165 is inserted into a switch hole 144 provided so as to be orthogonal to the side surface of the USB device insertion port 143. The speed instruction switch 165 is connected to the power switch 131 by a lead wire not shown in the figure. When the power switch 131 is turned on, one end of the pin-shaped speed instruction switch 165 protrudes from the switch hole 144 and turns off. When configured, the switch hole 144 is configured to be immersed.

  Next, the configuration of the USB device 201 will be described with reference to FIGS. 14 and 15. As illustrated in FIG. 14, the USB device 201 includes a speed instruction detection switch 241 connected to the bus 290 in addition to the configuration of the USB device 200 according to the first embodiment. The speed instruction detection switch 241 is a switch for detecting a speed setting instruction from the speed instruction switch 165 when the USB device 201 is connected to the projector 101. As shown in FIG. 15, the speed instruction detection switch 241 is a switch mechanism provided inside one side of the box-shaped casing of the USB device 201 and is provided in the casing when connected to the projector 101. When the switch plate 242 is pushed by the speed instruction switch 165 of the projector 101 through the hole (not shown) and comes into contact with the terminal 243, the two are brought into conduction and are turned on.

  Here, the operation when the USB device 201 is connected to the projector 101 will be described with reference to FIGS. FIG. 15 shows the USB device 201 and the projector 101 before connection. At this time, since the power switch 131 of the projector 101 is OFF, the speed instruction switch 165 of the projector 101 is in a state of being immersed in the switch hole 144. Further, the speed instruction detection switch 241 of the USB device 201 is in an OFF state in which the switch plate 242 and the terminal 243 are not in contact. Next, when the USB device 201 is fitted into the USB device insertion slot 143 and the USB connector 222 of the USB device 201 and the USB connector 142 of the projector 101 are connected, the state shown in FIG. 16 is obtained. In FIG. 16, the power switch 131 is still in the OFF state, and the speed instruction switch 165 remains immersed in the switch hole 144. Therefore, the speed instruction detection switch 241 remains in the OFF state. When the power switch 131 is turned on in this state, the speed instruction switch 165 connected to the power switch 131 detects this, and protrudes from the switch hole 144 as shown in FIG. The switch plate 242 of the detection switch 241 is pushed in the direction of the terminal 243 and brought into contact. As a result, the two are made conductive, and the speed instruction detection switch 241 is turned on.

  Here, the fact that the power switch 131 of the projector 101 is in the OFF state means that the lamp 172 has not yet been turned on (turned off), and thus no high voltage noise is generated. Therefore, when the speed instruction switch 165 is in the switch hole 144, it is desirable to perform transfer at high speed with high transfer efficiency. On the other hand, when the power switch 131 is in the ON state, since the lamp 172 is lit, high voltage noise is generated. Therefore, when the speed instruction switch 165 protrudes from the switch hole 144, if transfer is performed at a low speed that is not easily affected by noise, occurrence of a transfer error can be suppressed. Therefore, in the present embodiment, the protruding and immersing of the speed instruction switch 165 are set to “low speed setting” and “high speed setting”, respectively, and any setting instruction is given by the ON / OFF signal of the corresponding speed instruction detection switch 241. Is detected by the CPU 211. As will be described in detail later, the transfer rate requested to the USB host controller 141 is changed according to the detection result.

  The wireless setting information transfer process performed in the data transfer system 1 including the projector 101 and the USB device 201 will be described below with reference to the flowcharts of FIGS. In the projector 101, the wireless setting information transfer process is performed by the CPU 111 loading the control program stored in the ROM 112 into the RAM 113 and executing it. In the USB device 201, the CPU 211 stores the control program stored in the ROM 212. This is performed by loading it into the RAM 213 and executing it.

  As shown in FIG. 18, the wireless setting information transfer process is started when a power cable (not shown) of the projector 101 is inserted into an outlet and turned on. First, the CPU 111 performs initialization processing of the USB host controller 141 and the RAM 113 (S501). At this time, since the power switch 131 has not been turned on yet, as shown in FIG. 16, the speed instruction switch 165 is in the state of being immersed in the switch hole 144, that is, the high speed setting is instructed (S502). Thereafter, when the USB device 201 is connected to the projector 101, the CPU 111 detects the connection via the USB host controller 141 (S511: Yes). Then, the recognition process (enumeration) of the USB device 201 is started between the USB host controller 141 and the USB device controller 221 of the USB device 201 when the reset signal is issued from the USB host controller 141 of the projector 101. .

  Here, while the USB host controller 141 holds the reset signal, the speed instruction detection switch 241 of the USB device 201 has a switch board because the speed instruction switch 165 of the projector 101 is in an immersive state as shown in FIG. An OFF state where 242 is not in contact with the terminal 243, that is, a high-speed setting instruction is detected (S512). Therefore, the CPU 211 of the USB device 201 instructs the USB device controller 221 to request the USB host controller 141 to connect at the highest speed. Specifically, after the D + line is temporarily pulled up, an instruction is given to perform device Chirp that drives the D + line and the D− line to the K state. Upon receiving this instruction, the USB device controller 221 performs device Chirp with respect to the USB host controller 141, and requests connection at the highest speed (480 Mbps) as an HS compatible device (S513).

  When the device Chirp ends, the USB host controller 141 that has received the device Chirp responds with a hub Chirp that alternately drives the K state and the J state on the D + line and the D− line, and performs communication between the two in the HS mode (480 Mbps). To be connected (S521). Then, the CPU 111 of the projector 101 once reads the wireless setting information stored in the nonvolatile memory 161 (see FIG. 13) of the projector 101 into the RAM 113, and the USB device 201 via the USB host controller 141 and the USB device controller 221. Writing to the removable area 261 (see FIG. 14) of the flash memory 260 is started (S522). After starting the writing and when the USB device 201 is not connected (S511: No), the CPU 111 monitors the connection of the USB device 201 until the power switch 131 is turned on (S531: No) ( When the connection is detected (S511: Yes), the projector 101 and the USB device 201 repeat the processes of S512 to S522 described above.

  When the power switch 131 is turned on (S531: Yes), the speed instruction switch 165 connected to the power switch 131 detects this, and as shown in FIG. 17, the low speed setting instruction state protruding from the switch hole 144 (S532). Also, the lamp 172 is turned on by the CPU 111 (S533), and an image input from the outside via the video signal input circuit 163 or an image received from the outside by the wireless communication unit 150 is transferred from the imaging optical system 175 to the screen. Projected (S534).

  As shown in FIG. 19, after this, the CPU 111 monitors the connection of the USB device 201 via the USB host controller 141 (S541), and when the connection is detected (S541: Yes), the USB host controller of the projector 101 When the reset signal is issued in 141, the recognition process (enumeration) of the USB device 201 is started again between the USB device controller 221 of the USB device 201.

  At this time, while the USB host controller 141 holds the reset signal, the speed instruction detection switch 241 of the USB device 201 has a switch board because the speed instruction switch 165 of the projector 101 is in the protruding state as shown in FIG. An ON state in which 242 is pressed and contacts the terminal 243, that is, a low-speed setting instruction is detected (S542). Therefore, the CPU 211 of the USB device instructs the USB device controller 221 to request the USB host controller 141 to connect at a low speed. Specifically, after the D + line is temporarily pulled up and recognized by the USB host controller 141 as an FS-compatible device, an instruction is given not to perform device Chirp. Then, the USB device controller 221 does not perform device Chirp with respect to the USB host controller 141, but requests connection at a low speed (12 Mbs) as an FS-compatible device (S543).

  At this time, if the CPU 111 that has received a low-speed connection request from the USB device 201 via the USB host controller 141 does not complete the information writing (S551: No), the writing is temporarily stopped (S552). Then, the communication between the two is set to the FS mode (12 Mbps) via the USB host controller 141 and reconnected (S553), and the writing of the wireless setting information is resumed at a low speed (12 Mbps) (S554). The CPU 111 connects the USB device 201 after resuming writing and when information writing to the USB device 201 is completed (S551: Yes) until the power switch 131 is turned off (S561: No). When the connection is detected (S541: Yes), the projector 101 and the USB device 201 repeat the processes of S542 to S554 described above.

  When the power switch 131 is turned off (S561: Yes), the CPU 111 turns off the lamp 172 (S562). At this time, as shown in FIG. 16, the speed instruction switch 165 of the projector 101 returns to the high-speed setting instruction state again immersed in the switch hole 144 (S563). Next, the CPU 111 performs an end process (S564) and completes the wireless setting information transfer process.

  As described above, in the present embodiment, the projector 101 is provided with the speed instruction switch 165 linked to the power switch 131 that starts lighting the lamp 172, and the USB device 201 is turned on by the protrusion of the speed instruction switch 165. A speed instruction detection switch 241 is provided. As described above, the lighting state of the lamp 172 can also be detected by physical means, and the data transfer rate can be changed according to the lighting state.

  In the present embodiment, the power switch 131 of the projector 101 corresponds to the “lighting instruction unit” of the present invention. Further, the speed instruction switch 165 of the projector 101 corresponds to the “transfer error suppressing unit” of the present invention. The speed instruction detection switch 241 of the USB device 201 corresponds to the “speed instruction detection unit” of the present invention, and the CPU 211 and the USB device controller 221 of the USB device 201 that performs the processing of S513 in FIG. 18 and S543 in FIG. This corresponds to the “low speed request means” of the present invention.

  In addition, the structure shown by the above-mentioned embodiment is an illustration, and it cannot be overemphasized that various deformation | transformation are possible for this invention. For example, in the embodiment, the USB device 200 (201) is configured as a dedicated device for transferring wireless setting information necessary for wireless communication in the image projection system 10 (11). You may use the other USB device apparatus connected using a cable.

  In the embodiment, the high-speed setting of the transfer speed is set to 480 Mbps corresponding to the USB 2.0 specification (HS), and the low-speed setting is set to 12 Mbps corresponding to the USB 1.1 specification (FS). HS, FS, and low speed (LS) may be properly used depending on whether they are compatible.

It is explanatory drawing of operation | movement (during image projection) of the image projection system. 2 is a block diagram showing an electrical configuration of projector 100. FIG. 2 is a block diagram showing an electrical configuration of a USB device 200. FIG. It is a block diagram which shows the electric constitution of PC300. 6 is an explanatory diagram of an operation of the image projection system 10 (during writing of wireless setting information to the USB device 200). It is explanatory drawing of operation | movement (during the wireless communication setting by PC300) of the image projection system. It is a flowchart of the write-in process of the wireless setting information which concerns on 1st Embodiment. It is a flowchart of the write-in process of the wireless setting information which concerns on 2nd Embodiment. It is a flowchart of the write-in process of the wireless setting information which concerns on 3rd Embodiment. It is a flowchart of the write-in process of the wireless setting information which concerns on 4th Embodiment. FIG. 10 is a flowchart of wireless setting information writing processing according to the fourth embodiment, and is a continuation of FIG. 10. 1 is a schematic configuration diagram of an image projection system 11. FIG. 2 is a block diagram showing an electrical configuration of projector 101. FIG. 2 is a block diagram showing an electrical configuration of a USB device 201. FIG. 6 is an explanatory diagram of a speed instruction operation from the projector 101 to the USB device 201. FIG. 6 is an explanatory diagram of a speed instruction operation from the projector 101 to the USB device 201. FIG. 6 is an explanatory diagram of a speed instruction operation from the projector 101 to the USB device 201. FIG. It is a flowchart of the radio | wireless setting information transfer process of the data transfer system 1 which concerns on 5th Embodiment. FIG. 19 is a flowchart of wireless setting information transfer processing of the data transfer system 1 according to the fifth embodiment, and is a continuation of FIG. 18.

Explanation of symbols

1 Data transfer system 100, 101 Projector 131 Power switch 141 USB host controller 161 Non-volatile memory 165 Speed indication switch 172 Lamp 111 CPU
200, 201 USB device 211 CPU
241 Speed indication detection switch

Claims (11)

A projector for projecting the image light formed by modulating light emitted from a high-pressure discharge lamp by a light modulation element to form image light,
A USB host controller that recognizes and manages the connected USB device, and transmits and receives data to and from the USB device;
A projector comprising transfer error suppression means for suppressing a transfer error in transmission / reception of the data to / from the USB device, which is caused by noise from the high-pressure discharge lamp. Lamp state determination means for determining whether the high-pressure discharge lamp is in a starting, lighting, or extinguishing state;
The projector according to claim 1, wherein the transfer error suppression unit sets and changes a transfer rate in transmission / reception of the data according to a determination result of the lamp state determination unit.   The transfer error suppression means determines that the lamp state determination means determines that the high-pressure discharge lamp is in a light-off state before starting, and when the USB host controller recognizes the connection of the USB device, the transfer speed is maximized. 3. The projector according to claim 2, wherein the transmission and reception of the data is started at a high speed, and the start of the high-pressure discharge lamp is prohibited until the transmission and reception of the data is completed.   The transfer error suppression means determines that the lamp state determination means determines that the high-pressure discharge lamp is in a light-off state before starting, and when the USB host controller recognizes the connection of the USB device, the transfer speed is maximized. The transmission / reception of the data is started at a high speed, and when the high-pressure discharge lamp is started during the transmission / reception of the data, the transfer speed is changed to a low speed. projector.   The transfer error suppression means determines that the lamp state determination means determines that the high-pressure discharge lamp is in a light-off state before starting, and if the USB host controller recognizes the connection of the USB device, the transfer speed is reduced. The projector according to claim 2, wherein the transmission / reception of the data is started by setting to “1”.   When the USB host controller recognizes that the USB device is connected and the lamp state determination unit determines that the high-pressure discharge lamp is stable in a lighting state, the transfer error suppression unit The projector according to claim 2, wherein the transfer speed is set or changed to a maximum speed.   The transfer error suppression means changes the transfer speed according to the state of occurrence of the transfer error when the lamp state determination means determines that the high-pressure discharge lamp is stable in a lighting state. The projector according to any one of claims 2 to 5.   The projector according to claim 7, wherein the transfer error suppressing unit changes the transfer speed to a speed lower than a speed requested by the USB device. Storage means for storing the lighting time of the high-pressure discharge lamp and the number of transfer errors that have occurred,
An error occurrence rate calculating means for calculating the transfer error occurrence rate from the lighting time and the number of times stored in the storage means;
9. The projector according to claim 7, wherein the transfer error suppression unit changes the transfer rate based on the occurrence rate calculated by the error occurrence rate calculation unit. Data transfer of a projector comprising: a projector that modulates light emitted from a high-pressure discharge lamp by a light modulation element to form image light, and projects the formed image light; and a USB device connected to the projector A system,
The projector recognizes and manages a connected USB device, and transmits and receives data to and from the USB device;
A projector data transfer system comprising transfer error suppression means for suppressing a transfer error in transmission / reception of the data to / from the USB device, which is caused by noise at the time of starting the high-pressure discharge lamp. The projector includes a lighting instruction means for instructing start of the high-pressure discharge lamp,
The transfer error suppression means detects a start instruction by the lighting instruction means, and instructs the connected USB device to set a transfer speed in transmission / reception of the data to a low speed,
The USB device is configured to detect a low speed setting instruction for the transfer speed from the transfer error suppressing means, and to detect the low speed setting instruction when the speed instruction detecting means detects the low speed setting instruction. 11. The projector data transfer system according to claim 10, further comprising low-speed request means for requesting connection at low speed.

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