JP3095452U - Data projector - Google Patents

Abstract

[PROBLEMS] To provide an inexpensive and small data projector without substantially increasing power consumption in a standby state. A data projector controls an electric power supply line from a lamp electric power supply circuit to a light source lamp by controlling a switch element when an input to put the main body in a standby state is performed on an operation unit. By opening the lamp, the light source lamp 7 is turned off. As a result, the power consumption of the main body during standby can be suppressed to about 1/10 of that during operation. In addition, since the power supply line from the lamp power supply circuit 4 to the light source lamp 7 is opened by the switch element 4a, the circuit configuration is simple, so that the cost of the main body can be reduced and the main body can be downsized.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  In this invention, a digital display device displaying an image is illuminated by a light source lamp. , Data for projecting the image displayed on this digital display device on the screen Regarding projectors.

[0002]

[Prior art]

  Conventionally, a digital display device that displays an image (for example, a liquid crystal display device) The light source lamp illuminates the screen and the image displayed on this digital display device is screened. There was a data projector (for example, a liquid crystal projector) for projecting on the screen. Day Projectors project reflected or transmitted light from digital display devices. Project on the screen through the lens. Used for general data projector The light source lamp used is a vacuum discharge lamp, for example a mercury lamp.

[0003]   A conventional data projector has a commercial power supply, for example, AC100V, as an input power supply. And, this is full-wave rectified by the rectifier circuit, and the output of the rectifier circuit is the power factor correction circuit (PFC). Up-convert with the power factor correction circuit, and then up-convert the voltage with DC. A power supply circuit is used, which converts the voltage into a predetermined voltage by a DC conversion circuit. Datap The projector is a lamp power supply circuit that uses the output of the power factor correction circuit as the input power source. It is configured to turn on the lamp, and the main body operates with the output voltage of the DC-DC conversion circuit. This is a configuration in which the secondary side such as a CPU for controlling the operation is operated.

[0004]   In addition, the data projector suppresses unnecessary deterioration of the light source lamp and Do not display images on a digital display device to reduce body power consumption. In the standby state, the light emission of the light source lamp is Lower power. ), A power-off circuit is provided to reduce the fan speed. (See Patent Document 1).

[0005]   In addition, the reset of the microcomputer built in the main body without turning off the light source lamp. There is also proposed a data projector having a configuration capable of performing a setup (see Patent Document 2).

[0006]

[Patent Document 1]           JP, 2001-249402, A

[Patent Document 2]           Japanese Patent No. 3322664

[0007]

[Problems to be solved by the device]

  However, the data projector having the above power-off circuit is in the standby state. There is a circuit to reduce the power supplied to the light source lamp and fan motor when Since it was necessary, the circuit configuration was complicated, increasing the cost of the main body and increasing the size There was a problem.

[0008]   The purpose of this invention is to increase the power consumption in the standby state without increasing the power consumption. It is to provide a compact and cost-effective data projector.

[0009]

[Means for Solving the Problems]

  The data projector of this invention has the following configuration in order to solve the above problems. I am.

[0010]   (1) The digital display device is illuminated by the light source lamp, and the digital display device is illuminated. A data projector that projects reflected light from the vice or transmitted light onto the screen At   A lamp power supply circuit that supplies power necessary for lighting the light source lamp,   Whether to stop the power supply from the lamp power supply circuit to the light source lamp An input section for inputting   There is an input to the input section to stop the power supply to the light source lamp. Open the power supply line from the lamp power supply circuit to the light source lamp. And a switch element for releasing.

[0011]   With this configuration, the power from the lamp power supply circuit to the light source lamp is input at the input section. Input can be made to stop the power supply. Run the above light source from the lamp power supply circuit. If there is an input to stop the power supply to the lamp, the switch element will supply the lamp power. Open the power supply line from the circuit to the light source lamp. This allows the light source lamp to It is turned off. If the state at this time is set to the standby state, it will be consumed by the data projector. Most of the electric power supplied is from the light source lamp. The power consumption of the main unit during standby can be reduced to about 1/10 of that during operation. It

[0012]   In this standby state, other than the light source lamp, such as the CPU built in the main body, The operation unit supplies electric power necessary for operation.

[0013]   Also, instead of providing a power-off circuit, which has a complicated circuit configuration as in the past, , A switch element is used to supply power to the light source lamp from the lamp power supply circuit. Since the simple circuit configuration of opening the main unit is adopted, the cost of the main unit can be reduced. The size of the main body can be reduced while being achieved.

[0014]   (2) The input section supplies power from the lamp power supply circuit to the light source lamp. It has a wireless reception function of receiving a wireless signal instructing whether or not to stop power supply.   With this configuration, the remote control device connects the lamp power supply circuit to the light source lamp. The power supply can be stopped and usability can be improved.

[0015]   The wireless signal received by the input unit may be a radio wave or an infrared ray. Good. Also, stop the power supply from the lamp power supply circuit to the light source lamp. The main body may be provided with a button for instructing whether or not to perform.

[0016]   (3) The time during which no image is displayed on the digital display device is a fixed time When continuous, the switch element is controlled to control the light from the lamp power supply circuit. A lamp control means is provided for opening the power supply line to the source lamp.

[0017]   With this configuration, the time during which no image is displayed on the digital display device is constant. When the time continues, the control means controls the switch element to supply the lamp power. Open the power supply line from the circuit to the light source lamp. Therefore, if the user Forgetting to turn off the light source lamp (forgetting to shift to the standby state) Even if you leave your body, the light source lamp will automatically turn off after a certain period of time, Move to the standby state. This can reduce unnecessary power consumption sufficiently. It

[0018]

[Embodiment of device]

  Hereinafter, a data projector which is an embodiment of the present invention will be described.

[0019]   FIG. 1 is a block diagram showing a configuration of a data projector which is an embodiment of the present invention. It is a figure. The data projector 1 of this embodiment (hereinafter, simply referred to as the projector 1 To tell. ) Is a rectifier circuit 2, a power factor correction circuit 3, a lamp power supply circuit 4, a driver circuit. Path 5, DC-DC conversion circuit 6, light source lamp 7, digital display device 8, projection A unit 9, a control unit 11, a display unit 12, and an operation unit 13 are provided.

[0020]   A commercial power supply, for example, a commercial power supply of 100 V AC is input to the rectifier circuit 2. The rectifier circuit 2 has a diode bridge and full-wave rectifies the input commercial power supply. Circuit. The output of the rectifier circuit 2 is DC140V and is input to the power factor correction circuit 3. To be done. The power factor correction circuit 3 (PFC) is the circuit shown in FIG. Up-convert power (for example, DC140V to DC380V) ) And output. This power factor correction circuit 3 is controlled in a known manner. By controlling the switching transistor Q1 by the IC21, the rectifier circuit 2 It is a circuit that up-converts the output. Also, as will be described later, DC-DC conversion Wound on the primary side of the transformer T1 (flyback transformer) provided in the circuit 6. The voltage generated in the auxiliary winding is used as the operating power supply for the control IC 21. It

[0021]   The lamp power supply circuit 4 receives the output of the power factor correction circuit 3 as an input, and supplies it to the light source lamp 7. It is a circuit that supplies the power required for lighting. The lamp power supply circuit 4 has a light source When the lighting of the lamp 7 is started, a higher voltage than the normal time (while lighting) is applied to the light source lamp 7. A start-up circuit is included for doing so. This starting circuit is used when the lamp 7 starts lighting. Only works for a few seconds. Further, the lamp power supply circuit 4 includes a power source for the light source lamp 7. A switch element 4a for opening and closing the supply line is provided. This switch element 4 The opening / closing of a is controlled by the driver circuit 5. The switch element 4a is a transition It may be composed of a semiconductor element such as a star or a contact such as an electromagnetic relay. .

[0022]   The driver circuit 5 switches the lamp power supply circuit 4 between an operating state and a stopped state. It is a circuit that switches between. What is the operating state of the lamp power supply circuit 4? Is supplying the power necessary for lighting (the light source lamp 7 is switched by the switch element 4a). To the lamp power supply circuit 4 on the contrary. The stopped state is a state where the light source lamp 7 is not supplied with the power necessary for lighting (switch The state in which the power supply line to the light source lamp 7 is opened by the element 4a). Do When the main body of the projector 1 is in an operating state, the driver circuit 5 has a D It occurs in the auxiliary winding wound around the primary side of the transformer T1 provided in the C-DC converter 6. The state of the switch element 4a is switched according to the voltage present (lamp power supply circuit The state 4 is switched between the operating state and the stopped state. ). Also projector 1 When the main body is in the standby state, the switch element 4a is controlled to supply power to the light source lamp 7. Open the source supply line. Set the projector 1 main unit to the standby state or the operating state. The user can freely input the amount of time on the operation unit 13. In addition, When the time when the image is not displayed on the digital display device 8 is a predetermined constant time When there is a continuous period (for example, 5 minutes), the main unit automatically selects the standby state .

[0023]   The light source lamp 7 is a vacuum discharge lamp, for example, a mercury lamp. It

[0024]   The DC-DC conversion circuit 6 transforms the output of the power factor correction circuit 3 into a transformer as shown in FIG. It is a circuit that converts into a predetermined voltage at T1. Control unit 11, display unit 12, operation unit 13 , The secondary side of the transformer T1 with respect to the respective secondary side parts of the digital display device 8 and the like. The voltage generated in the winding is supplied as the operating power supply. On the primary winding of the transformer T1 Is connected to the output of the power factor correction circuit 3. Also, wound around the primary side of the transformer T1 The auxiliary winding is connected to the power factor correction circuit 3 and the driver circuit 5. To The voltage generated in the auxiliary winding wound on the primary side of the lance T1 is provided in the power factor correction circuit 3. It is supplied as the operating power source of the control IC 21. Also the driver The circuit 5 has a predetermined voltage generated in the auxiliary winding wound on the primary side of the transformer T1. If it is above the set voltage, it is judged that the power factor correction circuit 3 is operating properly, and If it is lower than the set voltage, it is determined that the power factor correction circuit 3 is not operating properly.

[0025]   Further, as shown in FIG. 3, a switching transistor is provided on the primary side of the transformer T1. The auxiliary winding for operating the switch Q2 is separately wound. Primary side of transformer T1 The two auxiliary windings wound in the same direction are wound in the same direction.

[0026]   The digital display device 8 is an image that is the basis of the image projected on the screen 10. And is a transmissive or reflective liquid crystal. The control unit 11 The image displayed on the digital display device 8 is controlled. The projection unit 9 is a digital A projection laser that projects reflected light or transmitted light from the display device 8 onto the screen 10. It is composed of

[0027]   The display unit 12 also displays the operating state of the main body of the projector 1. Operation part 1 3 is a switch for performing an input operation on the main body of the projector 1 From a switch that switches between standby mode) and a remote control device (not shown) The control command sent (instructing the main unit to switch between the operating state and the standby state) The control unit shown in FIG.

[0028]   Hereinafter, the operation of the projector 1 of this embodiment will be described.

[0029]   First, let's look at the operation of the projector 1 when the operating state is selected. Explain. The projector 1 has a commercial power source (AC100V) input to the main body. ) Is rectified by the rectification circuit 2 and input to the power factor correction circuit 3. The power factor correction circuit 3 During operation, the input (DC140V) from the rectifier circuit 2 is set to DC380V, for example. Convert and output.

[0030]   When the power factor correction circuit 3 is stopped, it is output from this power factor correction circuit 3. The direct current voltage is 140V DC.

[0031]   The DC-DC conversion circuit 6 converts the DC voltage input from the power factor correction circuit 3 into a transformer. The voltage is converted into a predetermined voltage by using the switch T1, and the control unit 11, the display unit 12, the operation unit 13, Also, operating power is supplied to the digital display device 8 (each part on the secondary side). Also , The voltage generated in the auxiliary winding wound on the primary side of the DC-DC conversion circuit 6 is It is supplied as an operating power source for the control IC 21 provided in the power factor correction circuit 3. It is also input to the driver circuit 5.

[0032]   The control unit 11 controls an image displayed on the digital display device 8 and A user's input operation on the operation unit 13 (including reception of a control command from a remote controller) The control of the main body based on (m) and the display of the image on the display unit 12 are controlled.

[0033]   The driver circuit 5 is one of the transformers T1 provided in the DC-DC conversion circuit 6. The voltage generated in the auxiliary winding wound on the secondary side is the preset voltage. Determine whether or not The auxiliary winding is used when the power factor correction circuit 3 is not operating. A voltage of about 5V (when the voltage applied to the primary winding is 140V) And when the power factor correction circuit 3 is operating (applied to the primary winding It is wound with a number of turns that produces a voltage of about 14V (when the voltage is 380V).

[0034]   The driver circuit 5 is wound around the primary side of the transformer T1 of the DC-DC conversion circuit 6. If the voltage generated in the auxiliary winding is 13 V or higher, the power factor correction circuit 3 operates. If it is less than 13V, the power factor correction circuit 3 is not operating. To judge. When the driver circuit 5 determines that the power factor correction circuit 3 is operating, From the lamp power supply circuit 4 to the light source lamp 7 by controlling the state of the switch element 4a. Close the power supply line. As a result, the light source lamp 7 is connected to the lamp power supply circuit 4. Is connected. Further, the driver circuit 5 is configured to start the lighting of the light source lamp 7 In this case, the starting circuit provided in the lamp power supply circuit 4 is operated for a few seconds. Then, the light source lamp 7 is turned on.

[0035]   When the power factor correction circuit 3 is operating, the lamp power supply circuit 4 receives the power factor correction circuit. Since the voltage up-converted by the path 3 is input, the light source lamp 7 is properly adjusted. It is possible to emit light with the amount of light emission. The light from the light source lamp 7 that is turned on is the liquid crystal. The light reflected by the digital display device 8 (the image display device is a reflection type Liquid crystal) or transmitted light (the image display device is a transmissive liquid) Screen) through a projection lens provided in the projection unit 9. Is illuminated on the screen 10 and displayed on the digital display device 8 on the screen 10. Images are displayed properly.

[0036]   On the other hand, the driver circuit 5 is wound around the primary side of the transformer T1 of the DC-DC conversion circuit 6. It is determined that the power factor correction circuit 3 is not operating due to the voltage generated in the auxiliary winding Then, the state of the switch element 4a is changed from the lamp power supply circuit 4 to the light source lamp 7. Since the power supply line of is kept open, the light source lamp 7 is required for lighting. No power is supplied. Therefore, the light source lamp 7 is not turned on.

[0037]   When the main body of the projector 1 is started, the power factor correction circuit 3 operates. Then, there is a slight time lag, but after that, the power factor correction circuit 3 starts operating and DC -It occurs in the auxiliary winding wound on the primary side of the transformer T1 of the DC conversion circuit 6. When the voltage rises, the driver circuit 5 controls the switch element 4a as described above. Power supply from the lamp power supply circuit 4 to the light source lamp 7 is started (light source lamp 7 Is turned on), there is no problem in the operation of the data projector 1 main body.

[0038]   On the other hand, when the power factor correction circuit 3 does not operate at all due to a failure or the like, the lamp power is not supplied. The voltage input to the power supply circuit 4 is not up-converted by the power factor correction circuit 4. this In this case, the light source lamp 7 cannot emit light with an appropriate amount of light emission. At this time, If the power supply line from the pump power supply circuit 4 to the light source lamp 7 is closed, The load on the lamp power supply circuit 4 increases and the lamp power supply circuit 4 fails. There is a high possibility that As described above, the projector 1 of this embodiment has the power factor improving circuit When the path 3 is not operating, the driver circuit 5 controls the switch element 4a to Hold the power supply line from the pump power supply circuit 4 to the light source lamp 7 open. Therefore, the load on the lamp power supply circuit 4 is suppressed and the lamp power supply circuit 4 is Can be prevented from breaking down.

[0039]   In addition, even if the light source lamp 7 is turned on when the power factor correction circuit 3 is not operating, , The amount of emitted light is reduced, so that a digital display device is displayed on the screen 10. The image displayed in 8 cannot be projected properly. Therefore, the power factor improvement times By not turning on the light source lamp 7 when the road 3 is not operating, There is no problem in the operation of the main body of the ejector 1. On the contrary, the light source lamp 7 Since the light source lamp 7 is not turned on unnecessarily, unnecessary deterioration of the light source lamp 7 is suppressed, The life of the projector 1 can be extended and the power consumption of the projector 1 body can be suppressed. The running cost can be reduced.

[0040]   Further, the projector 1 of this embodiment is provided in the power factor correction circuit 3. As the operating power supply for the control IC 21 that controls the switching transistor Q1 Occurs in the auxiliary winding wound around the primary side of the transformer T1 of the DC-DC conversion circuit 4. The circuit configuration is simple because it uses the voltage The cost increase can be suppressed.

[0041]   Next, the operation of the projector 1 when the standby state is selected will be described. To do. The projector 1 has a specific button (standby state) provided on the operation unit 13. Button to operate when selecting, or a remote control device not shown Received a control command instructing to change the state from the operating state to the standby state. At this time, the standby state is selected.

[0042]   The operation when the projector 1 shifts from the operating state to the standby state is performed by the driver circuit. 5 controls the switch element 4a to connect the lamp power supply circuit 4 to the light source lamp 7. Only operation via the power supply line. This turns on the light source lamp 7. It is not in a state. On the other hand, the power supply to the control unit 11 and the display unit 12 is stopped. Continue without being done. Most of the power consumed by the projector 1 is light. Do not turn on the light source lamp 7 because it is the power required to turn on the source lamp 7. Thus, the power consumption in the standby state can be sufficiently suppressed.

[0043]   Further, as in the conventional case, the light emission amount of the light source lamp 7 is reduced in the standby state. The light source lamp 7 is turned off instead of being turned on. Can be extended and the power supplied to the light source lamp 7 can be changed. Circuit becomes unnecessary (simply supply power from the lamp power supply circuit 4 to the light source lamp 7). (Since the circuit configuration is provided with a switching element that opens and closes the line), the circuit configuration is simple. The cost of the main body can be reduced due to the simplification, and the main body can be downsized.

[0044]   Further, in the projector 1 of this embodiment, an image is displayed on the digital display device 8. If the time that is not displayed continues for a certain fixed time (for example, 5 minutes) First, the main unit automatically selects the standby state, and the driver circuit 5 switches 4a to control the power supply line from the lamp power supply circuit 4 to the light source lamp 7. To do. Therefore, the user switches the state of the projector 1 from the operating state to the standby state. Even if you forget to replace it and leave the main unit, the light source lamp 7 is automatically turned off and the main unit is put in a standby state, so unnecessary power consumption is sufficient Can be suppressed to

[0045]   In the above embodiment, the switch element 4a is connected from the lamp power supply circuit 4 to the light source. It was decided that the power supply line to the lamp 7 should be opened and closed. The same effect can be obtained even if the power supply line to the power supply circuit 4 is opened and closed. It

[0046]

[Effect of device]

  As described above, according to the present invention, the electric power from the lamp power supply circuit to the light source lamp is A switch element that opens and closes the power supply line is provided. Open the power supply line from the lamp power supply circuit to the light source lamp Since the lamp is turned off, the cost of the main unit can be reduced and Miniaturization of the main body can be realized.

[0047]   In addition, the remote control device supplies power to the light source lamp from the lamp power supply circuit. Can be stopped and the usability can be improved.

[0048]   Furthermore, the user forgets to turn off the light source lamp (switches to the standby state. Even if you leave the device body, the light source lamp will automatically Lights off and puts the main unit into the standby state, so unnecessary power consumption is sufficiently suppressed. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a data projector according to an embodiment of the present invention.

FIG. 2 is a diagram showing a power factor correction circuit applied to the data projector according to the embodiment of the present invention.

FIG. 3 is a diagram showing a DC-DC conversion circuit applied to the data projector according to the embodiment of the present invention.

[Explanation of symbols]

1-data projector 2-rectifier circuit 3-Power factor correction circuit 4-Lamp power supply circuit 4a-switch element 5-driver circuit 6-DC-DC conversion circuit 7-light source lamp 8-Image display device 9-projection unit 10-screen 11-control unit 12-Display 13-Operation part 21-Control IC

Claims (4)

[Scope of utility model registration request] 1. A data projector for irradiating a digital display device with a light source lamp and projecting reflected light or transmitted light from the digital display device onto a screen. Lamp power for supplying power necessary for lighting the light source lamp. A supply circuit, an input section for inputting whether to stop the power supply to the light source lamp from the lamp power supply circuit, and an input to stop the power supply to the light source lamp at the input section A switch element for opening a power supply line from the lamp power supply circuit to the light source lamp, and when the digital display device does not display an image for a certain period of time, the switch element is controlled to A lamp control hand that opens the power supply line from the lamp power supply circuit to the light source lamp When, with a further, the input unit, the data projector has a radio receiving function of receiving a radio signal indicating whether to stop the power supply to the light source lamp from the lamp power supply circuit. 2. A data projector for illuminating a digital display device with a light source lamp and projecting reflected light or transmitted light from the digital display device onto a screen, lamp power for supplying power necessary for lighting the light source lamp. A supply circuit, an input section for inputting whether to stop the power supply to the light source lamp from the lamp power supply circuit, and an input to stop the power supply to the light source lamp at the input section And a switch element that opens a power supply line from the lamp power supply circuit to the light source lamp. 3. The data projector according to claim 1, wherein the input unit has a wireless reception function of receiving a wireless signal instructing whether to stop the power supply from the lamp power supply circuit to the light source lamp. 4. A lamp control for controlling the switch element to open a power supply line from the lamp power supply circuit to the light source lamp when an image is not displayed on the digital display device for a certain period of time. The data projector according to claim 1, further comprising: