JP4977555B2 - Lighting device - Google Patents

Description

  The present invention relates to an illumination device that emits light toward various irradiated objects.

  Conventionally, as an illumination device for irradiating light, as described in Patent Document 1 below, a technique for increasing the brightness of irradiated light by using a plurality of light sources at the same time, and described in Patent Document 2 below. As described above, a technique for controlling the brightness of light by controlling passage and blocking of light emitted from a plurality of light sources is known.

  These techniques are mainly used to improve the brightness of an image when light is projected onto a projection screen by a projection-type image display device such as a projector. In addition to metal halide lamps having excellent luminous efficiency and color reproducibility, xenon lamps, halogen lamps, ultra-high pressure mercury lamps (UHP lamps), and the like are used for this projection-type image display device.

Patent Document 1 describes that light is synthesized by combining different types of response limits. Specifically, a projection-type image display device with excellent color characteristics is realized by combining light sources having different spectral characteristics. In addition, according to this technique, it is possible to display an image substantially simultaneously with power on by combining light sources that can be turned on instantaneously among a plurality of light sources.
JP-A-6-265887 JP 2000-194067 A

  By the way, projection-type illumination devices such as projectors and projection-type illumination devices such as spotlights are limited in their uses, and even when configured with a plurality of light sources as described above, It is often limited to one type of light source.

  However, since the color temperature and the arc length differ depending on the type of light source, it is difficult to emit light suitable for various applications using one type of light source. For example, a metal halide lamp mainly used in a projector has a higher color temperature than other light sources. Therefore, in order to use a projector equipped with the metal halide lamp for lighting purposes, when the color temperature is lowered to the level of a halogen lamp, there arises a problem that the color becomes red.

  Further, the technique of combining different types of light sources as in Patent Document 1 cannot be switched according to the irradiation target or use conditions, and is limited to a single application.

  Then, this invention is proposed in view of the above-mentioned situation, and it aims at providing the illuminating device which can change the characteristic of the light discharge | released according to irradiation object instantaneously.

  The present invention relates to at least two types of light sources, irradiated object recognition means for recognizing irradiated objects irradiated with light emitted from any of the light sources, and irradiated objects recognized by the irradiated object recognition means. The light source control means for emitting light from any one of the light sources and the projection means for projecting the light from the light source controlled and emitted by the light source control means toward the irradiated object. In order to solve the above-described problems, the present invention is characterized in that the type of light source is selected according to the type of object to be irradiated with light.

  According to the present invention, since the type of the light source is selected according to the type of the object to be irradiated with light, the characteristics of the emitted light can be instantaneously changed according to the irradiation target.

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

  As shown in FIG. 1, an illumination device to which the present invention is applied includes at least two types of light sources 1A and 1B, and projection means for irradiating an irradiated object with light emitted from any one of the light sources 1A and 1B. And a drive unit 3 that drives the plane mirror 2. In addition, the illumination device includes a controller 4 that controls the operations of the light sources 1 </ b> A and 1 </ b> B and the drive unit 3.

  The light sources 1A and 1B may be of different types. As the light sources 1A and 1B, for example, a metal halide lamp (color temperature: about 6,500 to 7,500K), an ultra-high pressure mercury lamp (color temperature: about 9,000K), a xenon lamp (color temperature: used for a projector as an image display device). About 6,000K), or a halogen lamp for lighting (color temperature: about 3,400K). Desirably, the light source 1A is a metal halide lamp or an ultra-high pressure mercury lamp used in a projector, and the light source 1B is a halogen lamp for illumination.

  In addition to the configuration including two different types of light sources illustrated in FIG. 1, three or more types of light sources having different color temperatures may be provided instead of the two types of light sources.

  A specific configuration will be described. In the light sources 1A and 1B, the lamp unit 11 is inserted in the substantially central portion of the curved reflecting mirror 12, and the UV-IR cut filter 13 is attached to the light emitting side of the curved reflecting mirror 12. ing.

  The flat mirror 2 reflects the light emitted from one of the light sources 1A and 1B and projects it toward the object to be irradiated. The planar mirror 2 can project any one of the light emitted from the light sources 1 </ b> A and 1 </ b> B onto the irradiated object by changing the rotation angle by the driving unit 3 under the control of the controller 4. In addition, as a structure which projects the light of either light source 1A, 1B toward to-be-irradiated object, it is not restricted to the structure which consists of the plane mirror 2 and the drive part 3, For example, changing the emitted direction of light sources 1A, 1B etc. Other configurations may be used.

  The controller 4 emits light by driving the light sources 1 </ b> A and 1 </ b> B, and drives the drive unit 3 to adjust the rotation angle of the plane mirror 2. In this case, the controller 4 functions as an irradiation object recognition means for identifying an irradiation object irradiated with light emitted from any one of the light sources 1A and 1B. Specifically, the controller 4 is provided with an IC tag reader, and an IC tag storing information for recognizing the irradiated object is installed in the vicinity of the irradiated object. And the controller 4 recognizes a to-be-irradiated object by reading the information stored in the IC tag adjacent to the to-be-irradiated object with an IC tag reader. Examples of the information for recognizing the irradiated object include metals, cloths, papers, and screen materials that specify the surface material of the irradiated object. In this case, the IC tag reader operates so as to read information of the IC tag in a range where the illumination device irradiates light.

  For example, when the controller 4 reads information such as the screen material as the surface material of the irradiated object, the controller 4 projects the light emitted from the light source that is a metal halide lamp used for the projector onto the irradiated object. The rotation angle of the plane mirror 2 is controlled. On the other hand, when the controller 4 reads information on an object such as a metal as the surface material of the irradiated object, the controller 4 projects the light emitted from the light source, which is a halogen lamp used for illumination, onto the irradiated object. Thus, the rotation angle of the plane mirror 2 is controlled. In this case, the controller 4 sets in advance a correspondence table describing information for identifying the object to be irradiated and the correspondence between the light sources 1A and 1B, and is transmitted from an IC tag installed on the object to be irradiated. The light sources 1A and 1B corresponding to the received signals can be selected.

  As described above, the controller 4 functions as a light source control unit that irradiates the irradiated object with the light emitted from any one of the light sources 1A and 1B according to the signal representing the irradiated object. Thereby, the illuminating device can select the kind of light source according to the kind of irradiated object used as the irradiation object of light.

  As described above, according to the illuminating device to which the present invention is applied, a plurality of types of light sources 1A and 1B are mounted, and an object to be irradiated arranged in the irradiation range of light reflected by the plane mirror 2 is specified. Any one of the light sources 1A and 1B can be selected. Accordingly, light having an optimum color temperature can be projected onto the irradiation object according to the use of the lighting device. Specifically, when used as a spotlight for illuminating an object to be illuminated, a light source for illumination can be selected, while when projecting an image, a light source for a projector can be selected. Regardless of which is selected, it is possible to project light with no sense of incongruity toward the irradiated object.

  In addition, the lighting device may include a power supply circuit for starting or stopping power supply to each light source for each of the light sources 1A and 1B, and each power supply circuit may be controlled by the controller 4. This illuminating device emits light only from the light source that operates by controlling any one of the power supply circuits in order to emit light from any kind of light source in accordance with the type of the irradiated object. Accordingly, power can be saved and heat generated from the light source can be suppressed.

  Furthermore, this illumination device stops the power supply to the light sources 1A and 1B by all the power supply circuits when there is no object to be irradiated in the irradiation ranges of the light sources 1A and 1B. When an object to be irradiated newly exists, it is possible to supply power only to the light sources 1A and 1B corresponding to the type of the object to be irradiated.

  Furthermore, as shown in FIG. 2, the lighting device includes a plurality of cooling fans 5A and 5B for cooling the light sources 1A and 1B, and a power source for starting or stopping power supply to the cooling fans 5A and 5B by the controller 4 The circuit may be controlled. At this time, the controller 4 turns on the light sources 1A and 1B suitable for the recognized type of the irradiated object, and cools the light sources 1A and 1B of the type corresponding to the type of the irradiated object 5A. , 5B are operated.

  When determining the necessity of operating the cooling fans 5A and 5B in this way, the controller 4 turns on the cooling fans 5A and 5B when the light sources 1A and 1B are turned on, and a predetermined time elapses after the light sources 1A and 1B are turned off. Time control for turning off the cooling fans 5A and 5B at (1 minute), and the temperature at which the cooling fans 5A and 5B are operated when the temperature of the light sources 1A and 1B is measured and becomes a predetermined temperature (for example, 50 ° C.) or more. Take control.

  Thereby, even if it is a case where cooling of light source 1A, 1B is required, an illuminating device suppresses the rotation sound which generate | occur | produces when cooling fan 5A, 5B operate | moves while omitting the electric power required for the said cooling. Can do.

  Further, as shown in FIG. 3, the illumination device takes out monochromatic light from the multicolor light emitted from any one of the light sources 1A and 1B, and generates optical light that combines the plurality of monochromatic lights taken out. The liquid crystal panels 25a, 25b, and 25c that are components may be provided, and the image light generated by the liquid crystal panels 25a, 25b, and 25c may be projected onto the irradiation object 29. The illuminating device thus configured uses an optical system (image generation means) provided in a so-called liquid crystal projector.

  In such an illumination device, light beams emitted from the light sources 1A and 1B are incident on a color separation optical system including a blue-green reflecting dichroic mirror 21, a blue reflecting dichroic mirror 22, and a reflecting mirror 23.

  Blue light included in the white light of the light sources 1A and 1B is reflected by the two dichroic mirrors of the color separation optical system, and the red light is transmitted by the blue-green reflecting dichroic mirror 21 and then reflected by the reflecting mirror 23. The green light is reflected by the blue-green reflecting dichroic mirror 21 and then passes through the blue reflecting dichroic mirror 22. Each color light has the same optical path distance from the light sources 1A and 1B to the liquid crystal panel 25a.

  Next, each color light enters the field lenses 24a, 24b, and 24c, respectively, and the divergent light beams from the light sources 1A and 1B are collimated. The collimated color lights are incident on the liquid crystal panels 25a, 25b, and 25c placed immediately after the field lenses 24a, 24b, and 24c, respectively, and modulated, and video information corresponding to the color lights is added.

  Each color light modulated by the liquid crystal panels 25a, 25b, and 25c is then incident on a color combining optical system including the blue reflecting dichroic mirror 26, the blue red reflecting dichroic mirror 27, and the reflecting mirror 23. Blue light is reflected by the blue reflecting dichroic mirror 26 and red light is transmitted. Further, since green light is transmitted through the blue-red reflecting dichroic mirror 27 and red light and blue light are reflected, all the color lights are combined on the same optical axis.

  The optical image synthesized in this way is projected and displayed on the irradiation object 29 which is a screen by the projection lens 28. As the projection lens 28, a lens close to a telecentric system is used.

  According to such an illuminating device including an optical system in a liquid crystal projector, when the object to be irradiated is a screen, the controller 4 controls the light source for the projector to be turned on. And this illuminating device controls liquid crystal panel 25a, 25b, 25c corresponding to each color based on a video signal, By monochromatic light synthesize | combined via liquid crystal panel 25a, 25b, 25c, it is an irradiated object. Images can be projected onto a screen.

  On the other hand, according to this illuminating device, when the object to be irradiated is an arbitrarily shaped object or the like, the controller 4 controls the illumination light source to be turned on. And this illuminating device passes all the monochromatic light by liquid crystal panels 25a, 25b, and 25c, recombines each monochromatic light, and projects multicolor light toward an irradiation object. Thereby, the illuminating device can project light onto the irradiated object by the light source for illumination.

  Furthermore, as another configuration of the illumination device, as shown in FIG. 4, an optical system (image generation means) that constitutes a DLP (Digital Light Processing) projector may be provided. This optical system includes a color wheel 32 and a DMD chip 34 as main components.

  The color wheel 34 is used to change the color (color temperature) of the projection light regardless of the illumination application or video projection application. As described above, the lighting device changes the type of the light source according to the recognized object to be irradiated, and projects light having a color temperature suitable for the type of the object to be irradiated. This is because different characteristics (particularly color temperature) depending on the type of light source are used depending on the application (illumination / video). Therefore, the illumination device shown in FIG. 4 can change the color temperature of the projection light by using the color wheel 32 in which the balance of a plurality of colors is changed. For example, the color temperature of light transmitted through the color wheel 32 can be lowered by increasing the ratio of R in each of the red, green, and blue (RGB) transmission parts constituting the color wheel 32. On the other hand, when the ratio of B is increased, the color temperature of the light transmitted through the color wheel 32 can be increased.

  Thus, by selecting the color wheel 32, a specific light source can be added to the color temperature change by selection, and the color temperature can be changed by selecting a color wheel with a specific RGB balance.

  Specifically, when a halogen lamp having a low color temperature is selected in accordance with the type of the object to be irradiated and the color temperature is to be further lowered, a color temperature setting input unit constituted by a signal input device such as a switch (not shown) is used. The input is received by the controller 4 and the color temperature is set to “low”. This color temperature change input means inputs the degree of change of the color temperature of the light irradiated to the irradiated object from the color temperature of the light source selected according to the type of irradiated object to be irradiated with light. .

  And the controller 4 can replace | exchange for the color wheel whose ratio of R is one step higher than the color wheel 32 selected by the irradiated object. Further, when the controller 4 receives an input signal for setting the color temperature to “low” by the color temperature setting input means, the color wheel can be replaced with a color wheel having a further increased R ratio.

  For example, consider a case where the illumination device is configured to include an image light source that emits image light and an illumination light source that emits illumination light as two types of light sources. This image light source is a light source suitable for image projection with high luminous efficiency, and examples thereof include a metal halide lamp and an ultrahigh pressure mercury lamp currently mounted on a projector. However, it is conceivable that a light source suitable for image projection will appear in the future, so that it is not limited to a metal halide lamp or an ultrahigh pressure mercury lamp. Since liquid crystal projectors use optical components for color separation / synthesis, a white light source is required and a color wheel cannot be used. The DLP projector (one chip) uses a color wheel, but it is not used to change the color temperature, but only for mounting a plurality of colors.

  The case where the object to be irradiated is the screen 36 and an image is projected on the screen 36 will be described. The illumination device emits light by a projector light source (image light source) among a plurality of light sources under the control of the controller 4, and the image light is transmitted through a lens, a color wheel 32, and a lens 33 to DMD (digital Micromirror device) The light is incident on the chip 34. The image light emitted from the light source is transmitted through the color wheel 32 driven according to the control of the controller 4, thereby becoming any one of red, green, and blue monochromatic light. The color wheel 32 is rotationally driven at a predetermined speed and transmits red, green, and blue monochromatic light to the DMD chip 34 in a time-sharing manner. The DMD chip 34 is composed of a large number of micromirrors, and each micromirror is controlled by the controller 4 to control light projected onto the screen 36 through the lens 35. The DMD chip 34 can project an image on the screen 36 by switching between reflection / non-reflection for each of the red, green, and blue monochromatic lights in synchronization with the rotation speed of the color wheel 32.

  On the other hand, in the illumination device that projects an image on the screen 36 in this way, when illuminating the object to be illuminated, the illumination light source emits light according to the control of the controller 4, and the position of the color wheel 32 To a position that does not overlap the optical axis of the light source. Further, the DMD chip 34 reflects all of the illumination light incident through the lens 33 to the lens 35 and projects it onto the object to be irradiated. Examples of the configuration for changing the position of the color wheel 32 include an actuator that is driven according to the control of the controller 4.

  As a result, when the image is projected onto the screen 36, the illumination device projects the light emitted from the image light source onto the irradiated object via the color wheel 32 and the DMD chip 34, and projects the illumination light onto the irradiated object. In this case, the color wheel 32 can be prevented from transmitting.

  In addition to the color wheel that transmits the monochromatic light of red, green, and blue shown in FIG. 4, this illumination device transmits monochromatic light such as white and yellow in addition to the monochromatic light of red, green, and blue. A color wheel may be provided. Such an illuminating device includes a plurality of types of light sources for video, and a combination of each of the video light sources and a color wheel having a different arrangement of transmission parts that transmit monochromatic light is set in advance. As a result, as described above, a combination of a light source and a color wheel, which is a preset combination, is selected according to the type of the object recognized by the controller 4. The combination of the light source and the color wheel may be set as a numerical value of the color temperature realized by the combination of the light source and the color wheel. For example, the combination of the color temperature is set to 3,000K. Keep it. Further, a combination of a specific light source and a color wheel may be manually set in advance.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

It is a schematic block diagram of the illuminating device to which this invention is applied. It is a schematic block diagram of the other illuminating device to which this invention is applied. It is a figure which shows the structure of the illuminating device provided with the optical system with which the liquid crystal projector is equipped. It is a figure which shows the structure of the illuminating device provided with the optical system which comprises a DLP projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A, 1B Light source 2 Flat mirror 3 Drive part 4 Controller 5A, 5B Cooling fan 11 Lamp part 12 Curved surface reflecting mirror 13 IR cut filter 21 Blue-green reflecting dichroic mirror 22 Blue reflecting dichroic mirror 23 Reflecting mirror 24a, 24b, 24c Field lens 25a , 25b, 25c Liquid crystal panel 26 Blue reflective dichroic mirror 27 Blue red reflective dichroic mirror 28 Projection lens 29 Object to be irradiated 32 Color wheel 31, 33, 35 Lens 34 DMD chip 36 Screen

Claims (7)

Two types of light sources including at least a video projection light source;
Irradiated object recognition means for recognizing an irradiated object irradiated with light emitted from any one of the light sources;
Light source control means for emitting light from any one of the light sources based on the irradiated object recognized by the irradiated object recognition means;
Projection means for projecting light from the light source controlled and emitted by the light source control means toward the irradiated object ;
Video generating means for generating video,
The type of the light source is selected according to the type of the object to be irradiated with the light, and when the image projection light source is selected, the object to be irradiated is emitted by the light emitted from the image projection light source. A lighting device characterized by projecting an image on the screen . Wherein the at least two light sources, the lighting device according to claim 1, characterized in that it comprises a and illuminating light source the image projecting light source. The light source control unit includes a light source power source control unit that controls a power supply circuit that starts or stops power supply to each light source and switches on and off the light emitted from each light source.
3. The light source power source control unit according to claim 1, wherein the light source power source control unit causes light to be emitted from any type of light source according to a type of the irradiation object recognized by the irradiation object recognition unit. Lighting device. A plurality of cooling fans for cooling each light source;
Cooling power control means for controlling a power supply circuit for starting or stopping power supply to the cooling fan,
The cooling power supply control means cools a light source of a type corresponding to the type of the irradiated object according to the type of the irradiated object recognized by the irradiated object recognition means. 4. The illumination device according to any one of 3. At least two kinds of color wheels,
And color wheel control means for controlling the light emitted from the light source to pass through any one of the color wheels based on the object recognized by the object recognition means. The illumination device according to any one of claims 1 to 4. Color temperature change input means for inputting the change degree of the color temperature of the light irradiated to the irradiated object from the color temperature of the light source selected according to the type of irradiated object to be irradiated with the light,
6. The illumination according to claim 5, wherein the color wheel control unit performs control so that any one of the color wheels is transmitted based on a degree of change in the color temperature input to the color temperature change input unit. apparatus. A combination of the light source and the color wheel is preset,
6. The illumination device according to claim 5, wherein a combination of the light source and the color wheel is changed according to a type of the object recognized by the object recognition means.

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