JP4707589B2 - Projection display device - Google Patents

Description

  The present invention relates to a projection display apparatus such as a liquid crystal projector, and more particularly to its antitheft function.

  In recent years, projection-type image display devices such as liquid crystal projectors are becoming widespread, but they are still expensive and are small and light, so they are easily stolen. As a theft prevention measure for these projectors, there is an alarm function. Conventionally, an anti-theft alarm device is simply attached to the projector main body, and is not linked to the projector main body.

In Patent Document 1, the multicore cable carrying the theft detection signal is short-circuited in the liquid crystal projector main body when the alarm control device and the liquid crystal projector main body are connected by the multicore cable. If the multi-core cable is cut or the connector part is removed while trying to remove the LCD projector body, the multi-core cable is opened, and this change is detected by the alarm control device, and the theft detection signal Is supplied to the alarm device.
JP 7-160955 A (G08B 13/12)

  However, in the conventional technology as described above, when the anti-theft function is activated and an alarm is issued, it is sufficient that there is a user or the like nearby, but since a user in a remote location cannot know, even when not in use There was a problem in convenience because a user or the like had to be placed nearby.

  Also, since the alarm is for anti-theft, it cannot be easily stopped when it is activated, so when the user uses the liquid crystal projector, the anti-theft function is accidentally activated due to movement, etc. However, there was a problem in convenience, such as being unable to stop the alarm and causing trouble in use.

  Accordingly, the present invention has been made to solve such a problem, and a projection type video display device with improved convenience is obtained by interlocking an anti-theft alarm device with a projection type video display device body. It is intended to provide.

  In order to achieve the above object, the invention according to claim 1 of the present application includes a network unit for inputting a video signal and the like to the projection display apparatus main body via a network, and an antitheft device. In a projection type video display device comprising a battery-powered alarm device and vibration detection means, a warning mode is entered when the AC power supplied to the projection type video display device is turned off, and the projection type video is displayed in the warning mode. When the vibration of the display device body is detected by the vibration detecting means, the alarm device is activated, and an e-mail indicating that is preset from the network unit by the battery power source based on the output indicating the alarm operation from the alarm device. A control unit for transmitting to the transmission destination, and the control unit further passes a predetermined time from when the alarm of the alarm device is activated; By the time, when the AC power supplied to the main body of the projection display apparatus is turned on, the alarm device is stopped, and the alarm device is stopped when a predetermined time has elapsed since the alarm operation of the alarm device. Is.

According to the invention described in claim 1 of the present application, an electronic device indicating that is based on an output indicating an alarm operation from an alarm device by effectively using a network unit for inputting a video signal or the like via a network. Even if the theft occurs when the user or the like is not nearby because the mail is transmitted from the network unit to a preset destination, the user's mobile phone or security system that is preset to that effect Since it is promptly notified to a transmission destination such as (company) and can respond immediately, it is not necessary to place a user or the like nearby even when not in use, and convenience is improved. Furthermore, the alarm operation stops when the AC power supplied to the projection video display device main body is turned on when the alarm device operates, so that when the user uses the projection video display device main body, the alarm operation is stopped. Even if the anti-theft function is activated by mistake, the alarm is stopped when the AC power supply of the projection display apparatus main body is turned on, so that convenience is improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an embodiment of a liquid crystal projector as a projection display apparatus of the present invention.

  In this embodiment, an ADC (Analog-to-Digital Converter) 2 that converts an input video signal from the input terminal 1 from an analog signal to a digital signal, and video signal processing that performs various processes on the AD-converted video signal The circuit 3, a DAC (Digital-to-Analog Converter) 4 that converts the output from a digital signal to an analog signal, a liquid crystal panel drive & light source 6 that visualizes a DA-converted video signal, and the output light are shown in the figure An optical system 6 for enlarging and projecting to a screen, a microcomputer 7 for controlling the video signal processing circuit 3, the liquid crystal panel drive & light source 5, etc., and a network for inputting video signals via the network A liquid crystal projector main body 100 is composed of the unit 8 and the like.

Each circuit of the liquid crystal projector main body 100 is supplied with power from an AC (alternating current) power supply via the power plug 10 and the power supply unit 11, but the network unit 8 can be supplied even when the AC power is turned off. A battery power supply 9 is provided so that it can operate.
In addition, a vibration alarm unit 12 for preventing theft is attached and electrically connected to the liquid crystal projector main body 100. The vibration alarm unit 12 is driven by a battery 13.

  The vibration alarm unit 12 detects vibration and generates an alarm, and includes a microcomputer (control means), an IC (Integrated Circuit) such as a vibration detection switch, and a buzzer for warning sound. Yes. The network unit 8 includes a microcomputer (control means), a wireless LAN (Local Area Network), a driver IC for a wired LAN, a graphic IC for video output, and the like.

  When the vibration alarm unit 12 detects vibration with the vibration detection IC, the vibration alarm unit 12 detects the vibration with the microcomputer in the unit 12 and issues a warning (alarm) with a buzzer. A HIGH level is output to a predetermined output port in an IO (Input Output) port. When the output port of the output port is at a HIGH level, it is in an alarm state in which vibration is detected, and at the time of LOW output, it is in a normal state in which vibration is not detected. This output port is connected to the network unit 8 and is configured so that the presence or absence of vibrations and alarms can be detected by a microcomputer in the network unit 8. In addition, when the AC power supply of the liquid crystal projector main body 100 is turned on in the alarm state, the vibration alarm unit 12 detects the AC power supply ON at a predetermined input port of the microcomputer IO port in the unit 12 and issues an alarm. When the input port has a HIGH level input, AC power ON is detected, and when the input port has a LOW level input, AC power OFF is detected.

  2 is a flowchart showing the operation of an embodiment of the present invention. FIG. 2A shows a flowchart of the microcomputer in the vibration alarm unit 12, and FIG. 2B shows a flowchart of the microcomputer in the network unit 8. FIG. ing.

  As shown in FIG. 2 (a), when the microcomputer in the vibration alarm unit 12 starts operation, the battery power supply 9 of the network unit 8 is turned off and a predetermined output port of the microcomputer is set to the LOW state. A warning mode for detecting vibration is entered (N loop of step S101 → step S102 → step S103).

  When the liquid crystal projector main body 100 is moved to steal in the alert mode, the vibration is detected by the microcomputer in the unit 12 via the vibration detection IC of the vibration alarm unit 12. When vibration is detected, a buzzer for warning sound is driven to issue a warning (alarm), a predetermined output port of the microcomputer is set to HIGH level, and the battery power supply 9 of the network unit 8 is turned on. As a result, even if the AC power plug 10 is removed and the AC power supplied to the liquid crystal projector main body 100 is turned off during theft, the network unit 8 can operate.

  As shown in FIG. 2B, the microcomputer in the network unit 8 checks whether or not a predetermined output port of the microcomputer in the vibration alarm unit 12 is at a HIGH level (N loop in step S201). When the output port becomes HIGH level (alarm state), an e-mail indicating that the alarm state due to theft has occurred is sent to the user's mobile phone or security system (company) set in advance via the wireless LAN. Send.

  As a result, even if the theft occurs when there is no user or the like near the liquid crystal projector main body 100, the user's mobile phone or security system (company) or the like, which is set in advance, is notified immediately. Since it is possible to respond quickly, it is not necessary to place a user or the like nearby even when not in use, and convenience is improved.

  In addition, since the network alarm and the AC power cord can be removed by a thief before the vibration alarm unit 12 is activated, the above-described effects can be obtained more reliably.

  On the other hand, when a certain period of time has elapsed since the occurrence of the alarm state in steps S104 to S106 in FIG. While stopping the alarm, the battery power supply 9 of the network unit 8 is turned off, and the predetermined output port of the microcomputer in the vibration alarm unit 12 is also set to the LOW level.

  In this way, by stopping the alarm after a certain time has elapsed and turning off the battery power supply 9 of the network unit 8, the battery 13 of the vibration alarm unit 12 and the battery power supply 9 of the network unit 8 can be extended.

  FIG. 3 is a flowchart showing the operation of another embodiment of the present invention, and shows a flowchart of the microcomputer in the vibration alarm unit 12.

  When the microcomputer in the vibration alarm unit 12 starts its operation, it checks whether or not the AC power supply of the liquid crystal projector main body 100 is turned off via the predetermined input port (N loop in step S301). Is entered into a warning mode (Y in step S301 → N loop in step S302).

  When the liquid crystal projector main body 100 is moved to steal in the alert mode, the vibration is detected by the microcomputer in the unit 12 via the vibration detection IC of the vibration alarm unit 12. When vibration is detected, it is checked whether or not the AC power supply is ON. Here, since the power is OFF in step S301, the alarm buzzer is driven to generate an alarm (step S302). Y → N in step S303 → step S304).

  If the AC power is turned on before a certain period of time has elapsed after the occurrence of this alarm state (N in step S305 → Y in step S303), when the user uses the liquid crystal projector main body 100, the AC power supply is moved. It is determined that the anti-theft function has been activated by mistake, and the alarm is stopped (step S307). As described above, when the user uses the liquid crystal projector main body 100, even if the anti-theft function is accidentally activated due to movement or the like, an alarm (alarm) is provided if the AC power of the liquid crystal projector main body 100 is turned on. Since the alarm is stopped, it is difficult to stop the alarm and the use is not hindered. Even in this case, since the AC power supply of the liquid crystal projector main body 100 is turned on and used, and when the use is completed, the alarm mode is automatically entered simply by turning off the AC power supply, so the convenience is further improved. Even if the alarm is stopped if the AC power supply of the liquid crystal projector main body 100 is turned on in the case of malfunction as described above, the AC power supply of the liquid crystal projector main body 100 to be taken off is turned on at the time of a real theft. There is no problem because it is impossible.

  On the other hand, when a certain period of time has elapsed since the occurrence of the alarm state in step S304, the alarm is stopped in order to prevent a problem that the alarm continues to sound if the theft is surprised by the alarm and gives up the theft. In this way, the battery 13 of the vibration alarm unit 12 can be made to last longer by stopping the alarm after a predetermined time has elapsed.

  In the above description, the operation shown in the flowchart of FIG. 2 and the operation shown in the flowchart of FIG. 3 have been described as different embodiments, but it is also possible to combine these flowcharts into one embodiment. If configured in this way, the effects of the above-described embodiments can be realized at the same time, and further improvement in convenience can be expected.

  Moreover, in the said embodiment, although the battery 13 was provided as a power supply of the vibration alarm unit 12, you may combine using the battery power supply 9 of the network unit 8 instead of providing the battery 13. FIG.

  In the above embodiment, a liquid crystal projector using a liquid crystal panel is shown as a projection display apparatus. However, the present invention can be applied to a projection display apparatus having another image light generation system. For example, the present invention can also be applied to a projector using a DLP (Digital Light Processing; registered trademark of Texas Instruments (TI)) system.

The block diagram which shows the structure of one Embodiment of the liquid crystal projector as a projection type video display apparatus of this invention. The flowchart which shows operation | movement of one Embodiment of this invention. The flowchart which shows operation | movement of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Image signal processing circuit 5 Liquid crystal panel drive & light source 6 Optical system 7 Microcomputer 8 Network unit 9 Battery power supply 11 Power supply unit 12 Vibration alarm unit 13 Battery 100 Liquid crystal projector main body

Claims (1)

In a projection type video display device comprising a network unit for inputting video signals etc. via a network, a battery-powered alarm device for theft prevention, and vibration detection means on the projection type video display device body,
When the AC power supplied to the main body of the projection display apparatus is turned off, the alarm mode is activated. When the vibration of the projection display apparatus body is detected by the vibration detection means in the alarm mode, the alarm device is activated and the alarm is activated. Based on an output indicating an alarm operation from the device, the control unit for transmitting an e-mail indicating that to the preset destination from the network unit by battery power ,
Furthermore, the control means stops the alarm device when the AC power supplied to the projection display apparatus main body is turned on until a predetermined time has elapsed since the alarm operation of the alarm device, and the alarm operation of the alarm device. A projection-type image display device, wherein an alarm device is stopped when a certain time has elapsed from the hour .