JP5256827B2 - Projection apparatus, projection method, and program - Google Patents

Description

  The present invention relates to a projection apparatus, a projection method, and a program suitable for a projector apparatus that uses an AC-driven lamp light source such as a high-pressure mercury lamp.

  The high-pressure mercury lamp that has been generally used as a light source for projector devices in the past cannot be turned on again until the lamp has cooled sufficiently because the mercury vapor pressure enclosed in the tube is high immediately after the lamp is turned off. In general, it takes about 10 minutes before relighting is possible.

  In this case, if the lamp is turned on again after the lamp is turned off and before the arc tube cools down, the life of the lamp is remarkably shortened.

In order to improve such a point, there has been considered a technique for extending the life of the lamp while enabling relighting immediately after the lamp is turned off. (For example, Patent Document 1)
JP 2003-297590 A

Including the technique described in the above-mentioned Patent Document 1, when the projection operation is finished and the power supply to the lamp is stopped, the following control is generally executed.
FIG. 4 is a timing chart showing the processing contents when the energization of a high-pressure mercury lamp used as a light source in a DLP (Digital Light Processing) (registered trademark) projector is stopped.

  FIG. 2A shows a synchronizing signal inputted to the ballast circuit (ballast) of the lamp so as to invert the polarity of the alternating current at the boundary of each color segment of the color wheel (not shown).

  This synchronization signal is a rectangular wave that alternately repeats an “H” level and an “L” level as shown in the figure, and the ballast circuit side receives the signal and controls the timing of lamp polarity inversion.

  In addition, this synchronization signal also serves as a lamp on / off control signal given from the system control system of the projector device. For example, when the circuit is constructed with the logic of lighting at “H” level, the ballast On the circuit side, the lamp is extinguished when the “H” level synchronization signal is not input from the “L” level for a certain period longer than the normal AC inversion period Tw.

  In FIG. 1 (1), it is supposed to be “H” level at the timing of t1, but since it is instructed to turn off the lamp by the system control system of the projector device, it does not become “H” level. A state in which the “L” level is maintained is shown.

  FIG. 4 (2) shows the power (current) supplied to the lamp of the ballast circuit controlled by the synchronization signal. In the state where a rectangular wave synchronization signal is given, every time it is shown, a positive and negative current is alternately repeated at a predetermined peak value in synchronization with this, and the lamp is AC driven at the rated voltage. I can understand that.

  Thereafter, a period p1 shown in the figure after the timing t1 is a period required for determining whether the lamp is extinguished, and a period in which the "H" level where the lamp is lit at a positive rated voltage is supposed to be high is originally indicated by a broken line in the figure. As shown, the negative rated voltage is maintained. At the end of the period p1, the current to the lamp is set to “0 (zero)” in order to turn off the lamp.

  Thus, after the projection operation is stopped and the synchronization signal is fixed to the “L” level, the AC inversion period Tw and the determination period p1 are added until the energization is actually stopped to turn off the lamp. A voltage with a biased polarity will continue to be applied to the lamp for the duration of time, resulting in a significant reduction in lamp life.

  The present invention has been made in view of the above circumstances, and the purpose of the present invention is to reduce the life of an AC-driven lamp as a light source as much as possible by performing an appropriate process when the lamp is turned off. An object is to provide a projection apparatus, a projection method, and a program that can be avoided.

  According to the first aspect of the present invention, there is provided a light source that emits light by AC driving, a projection unit that forms an optical image using light emitted from the light source, and projects the light toward a projection target, and a polarity of a drive current with respect to the light source A lighting control unit that supplies a synchronization signal for controlling the inversion timing, a first determination unit that determines the supply stop of the synchronization signal by the lighting control unit, and a determination of the supply stop of the synchronization signal by the first determination unit Correspondingly, a first light source control means for restricting power supply to the light source, and a stop of supply of the synchronization signal by the lighting control means in a state of restriction of power supply to the light source by the first light source control means. And a second light source control means for stopping the power supply to the light source in response to the determination of the supply stop of the synchronization signal by the second determination means. And

  According to a second aspect of the present invention, in the first aspect of the invention, the first determination means determines that there is no inversion of the polarity of the drive current by monitoring the synchronization signal, and the second determination unit The determination means is characterized in that the determination is made by the fact that the polarity of the drive current does not change for a predetermined period.

  The invention according to claim 3 forms a light image using light emitted from an AC-driven light source and projects the light image toward a projection target, and synchronization for controlling the polarity inversion timing of the drive current with respect to the light source. A projection control method in a projection apparatus including a lighting control unit that supplies a signal, the first determination step for determining the supply stop of the synchronization signal by the lighting control unit, and the synchronization in the first determination step Corresponding to the determination of the stop of signal supply, the first light source control step for restricting the power supply to the light source, and the lighting control in the power supply restriction state for the light source in the first light source control step. A second light source for stopping the power supply to the light source in response to the second determination step for determining the supply stop of the synchronization signal by the unit and the determination of the supply stop of the synchronization signal in the second determination step. And a control step.

  According to a fourth aspect of the present invention, there is provided a projection unit that forms a light image using light emitted from an AC-driven light source and projects the light image toward a projection target, and synchronization that controls the polarity inversion timing of the drive current with respect to the light source. A program executed by a computer built in a projection apparatus having a lighting control unit for supplying a signal, the first determination step for determining the supply stop of the synchronization signal by the lighting control unit, and the first determination step In response to the determination of the supply stop of the synchronization signal at, a first light source control step for restricting power supply to the light source, and a power supply restriction state for the light source in the first light source control step The power supply to the light source is stopped in response to the second determination step for determining the supply stop of the synchronization signal by the lighting control unit and the determination of the supply stop of the synchronization signal in the second determination step. Characterized in that to execute a second light source control step to the computer.

  According to the present invention, it is possible to avoid as much as possible the shortening of the life of an AC-driven lamp serving as a light source by performing an appropriate process when the lamp is turned off.

  An embodiment in which the present invention is applied to a DLP (registered trademark) data projector apparatus will be described below with reference to the drawings.

  FIG. 1 is a schematic functional configuration of a data projector apparatus 10 according to the present embodiment. Reference numeral 11 denotes an input / output connector unit, which includes, for example, a pin jack (RCA) type video input terminal, a D-sub15 type RGB input terminal, and a USB terminal.

  Image signals of various standards input from the input / output connector unit 11 are in a predetermined format suitable for projection by an image conversion unit 13, also called a scaler, via an input / output interface (I / F) 12 and a system bus SB. After being unified into an image signal, it is sent to the projection image processing unit 14.

  At this time, various characters, pointers, and the like for OSD (On Screen Display) are also sent to the projection image processing unit 14 to be superimposed on the image signal as necessary.

  The projection image processing unit 14 multiplies a frame rate according to a predetermined format, for example, 60 [frames / second], the number of color component divisions, and the number of display gradations in accordance with the transmitted image signal. The micromirror element 15 which is a spatial light modulation element (SOM) is displayed and driven by high-speed time division driving.

  On the other hand, a light source lamp 17 disposed in the reflector 16 using, for example, a high-pressure mercury lamp emits white light with high luminance. The light source lamp 17 is AC driven by the electric power from the ballast circuit 18, and the white light emitted from the light source lamp 17 passes through a color wheel 19 that rotates at high speed in synchronization with the display on the micromirror element 15. The primary color is colored in a time-sharing manner, and the luminous intensity distribution is made uniform by the integrator 20, and then totally reflected by the mirror 21 and irradiated onto the micromirror element 15.

  Then, an optical image is formed by the reflected light from the micromirror element 15, and the formed optical image is projected onto a screen (not shown) to be projected via the projection lens unit 22.

  The projection lens unit 22 enlarges and projects the light image formed by the micromirror element 15 onto a target such as a screen, and can change the focus position and the zoom position (projection angle of view) arbitrarily. .

  That is, the focus lens and the zoom lens (not shown) in the projection lens unit 22 are controlled by moving back and forth along the optical axis direction, and these lenses are moved by the rotational drive of the stepping motor (M) 23. To do.

  Further, the power supply to the ballast circuit 18 for turning on the light source lamp 18, the rotation drive of the motor (M) 24 for the color wheel 19, and the marker sensor 25 provided at the rotation peripheral end of the color wheel 19 Both the detection of the segment boundary and the rotational driving of the stepping motor 23 are executed by the projection light processing unit 26.

  The projection image processing unit 14 outputs a lamp synchronization signal synchronized with the switching timing of the image for each color component displayed on the micromirror element 15 to the ballast circuit 18 and the projection light processing unit 26.

  The CPU 27 controls all the operations of the above circuits. The CPU 27 uses the main memory 28 composed of DRAM and the program memory 29 composed of an electrically rewritable non-volatile memory storing operation programs, various fixed data, and the like to perform control operations in the data projector apparatus 10. Execute.

  The CPU 27 executes various projection operations according to operation signals from the operation unit 30. The operation unit 30 includes a key operation unit provided in the casing body of the data projector device 10 and an infrared receiving unit that receives an infrared modulation signal from a remote controller (not shown) dedicated to the data projector device 1. Directly outputs to the CPU 27 a key code signal based on the key operated by the key operation unit or the remote controller.

  The CPU 27 is further connected to the audio processing unit 31 via the system bus SB.

  The sound processing unit 31 includes a sound source circuit such as a PCM sound source, converts the sound data given at the time of projection operation into an analog signal, drives the speaker unit 32 to emit a loud sound, or generates a beep sound or the like as necessary.

Next, the operation of the above embodiment will be described.
FIG. 2 shows an extracted operation mainly related to the projection operation of the data projector device 10 when the power is turned on and the light source lamp 17 is turned off. The operation shown in FIG. 2 is controlled by developing the operation program read from the program memory 29 by the CPU 27 in the main memory 28 and executed by the projection light processing unit 26 under the control of the CPU 27.

  Initially, a projection process is performed in which a corresponding optical image is formed by the micromirror element 15 based on the image signal input from the input / output connector unit 11 and is projected by the projection lens unit 22 (step S101).

  At this time, a lamp synchronization signal is output from the projection image processing unit 14 to the ballast circuit 18 and the projection light processing unit 26 in synchronization with the color image formed by the micromirror element 15. The ballast circuit 18 switches the polarity inversion timing of the light source lamp 17 in synchronization with the synchronization signal, AC drives the light source lamp 17 with the rated voltage and rated current given from the projection light processing unit 26, and is suitable for projection. Bright white light is emitted.

  On the other hand, it is determined whether or not a key operation for instructing power-off is performed on the operation unit 30 (step S102), and if not operated, the process returns to step S101.

  By repeatedly executing the processes in steps S101 and S102 in this way, the projector waits for a key operation for powering off while continuing the projection process.

  When a key operation for turning off the power is performed, it is determined in step S102, and the projection operation for forming a light image by the micromirror element 15 is stopped, and the ballast circuit 18 and the projection image processing unit 14 are stopped. The lamp synchronization signal to the projection light processing unit 26 is also stopped (step S103).

  At the same time, the CPU 27 causes the projection light processing unit 26 to start monitoring the lamp synchronization signal (step S104), and determines the state that remains at the “L” level at the timing at which the “H” level should be originally set ( Step S105).

  FIG. 3 (1) shows the state of the lamp synchronization signal at this time, and at the position of t11 shown in the figure, it is the timing that should originally become “H” level as shown by the broken line, but still “L”. “The level remains.

When the timing t11 is determined in step S105, the projection light processing unit 26 restricts the supply current to the ballast circuit 18 to a necessary minimum value that can be relighted in accordance with the determination result (step S106). ).

  FIG. 3 (2) shows a driving current section (current) to the light source lamp 17 by the ballast circuit 18 in combination with the timing of the lamp synchronizing signal in FIG. 3 (1). Prior to the timing t11, the drive current to the light source lamp 17 is AC-driven so as to switch alternately between plus and minus at the peak value (absolute value) If for each polarity inversion period Tw.

Meanwhile, in the timing t11, if it is determined that still remains "L" level at the timing should ramp synchronizing signal becomes "H" level at step S105, the projection light processing unit 26 by the processing in the above step S106 Restricts the supply current to the ballast circuit 18 to the minimum necessary value Ih that can be relighted.

The current value Ih is set in advance according to the characteristics of the light source lamp 17, and is set to a minimum value that maintains a state where immediate relighting is possible in a state where a rated voltage is applied.

  In this way, from the state where the drive current value to the light source lamp 17 is lowered, the CPU 27 further causes the projection light processing unit 26 to continue monitoring the lamp synchronization signal (step S107), and again at a timing that should originally become the “H” level. A state in which the “L” level is maintained is determined (step S108).

  When this is determined at timing t12 shown in FIG. 3 (2), the projection light processing unit 26 and the like completely stop power supply to the ballast circuit 18 (step S109), and the processing of FIG. Finish the power off state.

  Also in FIG. 3B, the current value supplied to the light source lamp 17 becomes “0 (zero)” after the timing t12.

  Thus, the period p11 shown in the figure is necessary from the timing t11 until the light source lamp 17 is actually turned off completely. The current value supplied to the light source lamp 17 is originally from immediately after the timing t11. It is assumed that Ih is significantly limited from the value If.

  Therefore, it is possible to reduce the amount of electric power with a biased polarity that is given until the light source lamp 17 is completely turned off. As a result, the degree of shortening the life of the light source lamp 17 can be greatly reduced. Become.

  As described above, according to the present embodiment, it is possible to avoid as much as possible the shortening of the life of an AC-driven lamp serving as a light source by performing an appropriate process when the lamp is turned off.

  The above embodiment has been described with respect to a case where the present invention is applied to a DLP (registered trademark) type data projector apparatus. However, the present invention does not limit elements or the like that form a light image. If the lamp to be used is a light source, it can be similarly applied to other projection apparatuses.

  In the above embodiment, the case where the light source lamp 17 maintains the rated voltage and varies the current value by varying the current value has been described. However, as described above, the present invention performs AC driving. In the case of a projection apparatus using a lamp as a light source, it is possible to adjust the amount of power by voltage control as well.

  In addition, in the above embodiment, the projection light processing unit 26 adjusts the light emission state of the light source lamp 17 by changing the power supplied to the ballast circuit 18 for the light source lamp 17 under the control of the CPU 27. However, the present invention is not limited to this, and can be similarly applied to, for example, a high-intensity discharge lamp of the kind called ballastless, chokeless, in which a filament is built in the lamp and a ballast is unnecessary.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the functions executed in the above-described embodiments may be implemented in appropriate combination as much as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination according to a plurality of disclosed structural requirements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

The block diagram which shows the function structure of the electronic circuit of the data projector apparatus which concerns on one Embodiment of this invention. 6 is a flowchart showing the processing contents related to the projection operation and turning off the light source lamp according to the embodiment. The timing chart which shows the operation | movement at the time of the light extinction process of the light source lamp which concerns on the embodiment. The timing chart which shows the operation | movement at the time of the light extinction process of a general light source lamp.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Data projector apparatus, 11 ... Input / output connector part, 12 ... Input / output interface (I / F), 13 ... Image conversion part, 14 ... Projection image processing part, 15 ... Micromirror element (SOM), 16 ... Reflector, DESCRIPTION OF SYMBOLS 17 ... Light source lamp, 18 ... Ballast circuit, 19 ... Color wheel, 20 ... Integrator, 21 ... Mirror, 22 ... Projection lens unit, 23 ... Stepping motor (M), 24 ... Motor (M), 25 ... Marker sensor, 26 ... Projection light processing unit, 27 ... CPU, 28 ... main memory, 29 ... program memory, 30 ... operation unit, 31 ... sound processing unit, 32 ... speaker unit.

Claims (8)

A light source that emits light by alternating current drive;
A projection means for forming a light image using light emitted from the light source and projecting it toward a projection target;
Lighting control means for supplying a synchronization signal for controlling the polarity inversion timing of the drive current to the light source;
First determination means for determining the supply stop of the synchronization signal by the lighting control means;
In response to the determination of the supply stop of the synchronization signal by the first determination unit, a first light source control unit that limits power supply to the light source in a state where the polarity is fixed ;
Second determination means for determining the supply stop of the synchronization signal by the lighting control means in a restricted state of power supply to the light source by the first light source control means;
A projection apparatus comprising: a second light source control unit that stops power supply to the light source in response to the determination of the supply stop of the synchronization signal by the second determination unit. The first determination unit determines by reversing the polarity of the driving current by monitoring the synchronization signal is not present,
The projection apparatus according to claim 1, wherein the second determination unit determines that the polarity of the drive current does not change for a predetermined period. The first determination means determines that the supply of the synchronization signal is stopped when a signal of an inverted level is not input at the timing at which the next inverted signal of the synchronization signal is to be input. The projection apparatus according to claim 1 or 2. The second determination unit is configured to output the synchronization signal when the inverted signal is not input at the timing when the inverted signal is input next in the synchronization signal in a state where the power supply to the light source is limited. The projection apparatus according to claim 1, wherein it is determined that the supply is stopped. 2. The synchronization signal also serves as a control signal for turning on and off the light source, and turns off the light source when an inverted signal is not input for a certain period longer than an AC inversion period. The projection apparatus in any one of -4. The light source control means causes the first determination means to limit the supply current to the light source to a necessary minimum value that can be lit again in response to the determination of the supply stop of the synchronization signal. The projection apparatus according to claim 1, wherein the projection apparatus is characterized in that: A projection unit that forms a light image using light emitted from an AC-driven light source and projects the light image toward a projection target; and a lighting control unit that supplies a synchronization signal for controlling the polarity inversion timing of the drive current to the light source. A projection control method using a projection apparatus comprising:
A first determination step of determining the supply stop of the synchronization signal by the lighting control unit;
In response to the determination of the supply stop of the synchronization signal in the first determination step, a first light source control step for limiting power supply to the light source in a state where the polarity is fixed ;
A second determination step of determining a supply stop of the synchronization signal by the lighting control unit in a restricted state of power supply to the light source in the first light source control step;
A projection method comprising: a second light source control step for stopping power supply to the light source in response to the determination of the supply stop of the synchronization signal in the second determination step. A projection unit that forms a light image using light emitted from an AC-driven light source and projects the light image toward a projection target; and a lighting control unit that supplies a synchronization signal for controlling the polarity inversion timing of the drive current to the light source. A program executed by a computer built in the projection apparatus provided,
A first determination step for determining the supply stop of the synchronization signal by the lighting control unit;
A first light source control step for limiting power supply to the light source in a fixed state in response to the determination of the supply stop of the synchronization signal in the first determination step;
A second determination step of determining a supply stop of the synchronization signal by the lighting control unit in a state of restriction of power supply to the light source in the first light source control step;
A program that causes a computer to execute a second light source control step of stopping power supply to the light source in response to the determination of the supply stop of the synchronization signal in the second determination step.

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