JP5625285B2 - Lighting device - Google Patents

Description

The present invention relates to lighting equipment.

  The following light source devices are known. In this light source device, the light reduction amount of each wavelength component is calculated in order to realize the designated spectral distribution. Then, the tilt angle of the micromirror is calculated based on the calculated light reduction amount, and the micromirror is controlled based on the calculated tilt angle, thereby irradiating light with a desired spectral distribution (for example, Patent Document 1).

JP 2006-184234 A

  In the conventional light source device, the user generally determines the spectral distribution of the light to be irradiated while checking the color of the light to be irradiated on the chromaticity diagram, for example, by operating an equalizer displayed on the screen. There is no device that allows the user to specify the color to be irradiated on the chromaticity diagram and determine the spectral distribution.

The lighting device according to the first aspect of the present invention is a designating means for designating a color of output light on a chromaticity diagram displayed on a display device, and a coordinate value on the chromaticity diagram corresponding to the color designated by the designating means. Based on the specifying means for specifying the center wavelength and spread of the spectral distribution of the output light, and using the first spectral distribution function or the second spectral distribution function from the center wavelength and the spread specified by the specifying means Calculating means for calculating the spectral distribution of the output light, spectral means for splitting light emitted from the light source into each wavelength component, and the spectral means based on the spectral distribution of the output light calculated by the calculating means. Modulating means for modulating the light of each wavelength component dispersed by the light into light of each wavelength component of the output light, combining means for combining the light of each wavelength component of the output light modulated by the modulating means, and the combining Synthesized by means Output means for outputting the output light as the output light, and when the color in the first region of the chromaticity diagram is designated as the color of the output light by the designation means, When the spectral distribution of the output light is calculated using a first spectral distribution function, and the color in the second region of the chromaticity diagram is specified as the color of the output light by the specifying means, The spectral distribution of the output light is calculated using a second spectral distribution function .

  According to the present invention, the user can specify a color to be irradiated on the chromaticity diagram and determine the spectral distribution.

It is a block diagram which shows the structure of one Embodiment of an illuminating device. 1 is a block diagram illustrating a configuration of an embodiment of a light source device 100. FIG. 2 is a block diagram illustrating a configuration of an embodiment of a light source control device 200. FIG. It is a figure which shows the example of designation | designated of the color of light on a chromaticity diagram. FIG. 5 is a flowchart showing a flow of processing executed by a control device 203. It is a figure which shows the specific example of the table which linked | related chromaticity coordinate value, the center wavelength, and the breadth. It is a figure which shows the specific example of the preparation method of the table which linked | related chromaticity coordinate value, the center wavelength, and the breadth. It is a figure which shows the area | region which needs to add two spectral distributions on a chromaticity diagram. It is a figure which shows the specific example at the time of adding two spectral distributions. It is a figure which shows the specific example of a window function.

  FIG. 1 is a block diagram showing a configuration of an embodiment of a lighting device according to an embodiment of the present invention. The illumination device 10 includes a light source device 100 that includes a light source and a light source control device 200 that controls the light source device 100. The light source device 100 and the light source control device 200 are connected by wired communication or wireless communication, and can transmit and receive data between them.

  FIG. 2 is a block diagram illustrating a configuration of an embodiment of the light source device 100. The light source device 100 includes a white light source 101, a relay lens 102, a polarization beam splitter 103, a relay lens 104, a collimator lens 105, a grating 106, a camera lens 107, a reflective liquid crystal element array device (spatial modulation element). ) 108, a spatial modulation element driver 109, a condenser lens 110, an incident / exit slit 111, a stray light cut slit 112, and a light guide 113.

  As the white light source 101, for example, a xenon lamp or a halogen lamp is used. Light incident on the front focal position of the relay lens 102 from the white light source 101 is collimated into substantially parallel light by the relay lens 102 and input to the polarization beam splitter 103.

  As for the light incident on the polarization beam splitter 103, only linearly polarized light whose electric field vector is substantially parallel to the paper surface of FIG. 2 and perpendicular to the optical axis passes through the polarization beam splitter 103, and enters and exits the slit through the relay lens 104. The light is condensed on the opening 111. Here, the polarization splitting optical system is constituted by the relay lens 102, the polarization beam splitter 103, the relay lens 104, and the condenser lens 110 described later. The entrance / exit slit 111 is formed with a substantially rectangular opening in a direction substantially perpendicular to the paper surface of FIG.

  Light emitted from the opening of the entrance / exit slit 111 is collimated by the collimator lens 105 into substantially parallel light, enters the grating 106 having a wavelength dispersion action, and forms a spectrum image by the camera lens 107. The collimator lens 105, the grating 106, and the camera lens 107 constitute a wavelength dispersion type spectroscopic optical system. A reflective liquid crystal element array device 108 that is a spatial modulation element is disposed at a position where a spectrum image can be formed.

  The reflective liquid crystal element array device 108 includes a liquid crystal layer 108b, a cover glass 108a having a wedge shape on the incident side across the liquid crystal layer 108b, and a flat mirror 108c at a position facing the cover glass 108a with respect to the liquid crystal layer 108b. Has been placed. The liquid crystal layer 108b is sealed between the cover glass 108a and the flat mirror 108c. The reflected light intensity other than the surface reflection on the surface in contact with the outside of the cover glass 108a can be ignored in practice. The cover glass 108a can be used as long as it is made of a transparent medium other than glass.

  Although not shown in FIG. 2, the reflective liquid crystal element array device 108 has a plurality of liquid crystal elements that are independently controlled modulation elements arranged one-dimensionally, and the direction of the arrangement is the wavelength dispersion direction of the spectrum image. This corresponds to a direction perpendicular to the paper surface of FIG.

  The individual liquid crystal elements arranged one-dimensionally in the reflective liquid crystal element array device 108 are independently controlled by the spatial modulation element driver 109, and the light traveling back and forth in the individual liquid crystal elements is given different retardation for each element. The The spatial modulation element driver 109 is connected to the light source control device 200 in a wired or wireless manner, and controls the liquid crystal element based on a control signal from the light source control device 200.

  The light emitted from the reflective liquid crystal element array device 108 becomes elliptically polarized light that differs for each element, that is, for each wavelength element. Light that has been elliptically polarized by the reflective liquid crystal element array device 108 is subjected to wavelength multiplexing in the course of traveling through the camera lens 107, the grating 106, the collimator lens 105, and the wavelength dispersion type spectroscopic optical system, and is incident / exit slit. The light is condensed on the opening 111.

  The light emitted from the opening of the entrance / exit slit 111 is collimated by the relay lens 104 and enters the polarization beam splitter 103. The polarization separation unit of the polarization beam splitter 103 reflects linearly polarized light in a direction orthogonal to the electric field vector of the incident light, and is condensed at the rear focal position by the condenser lens 110. The light condensed by the condenser lens 110 enters the stray light cut slit 112 and can be led to the outside through the light guide 113, whereby the light source device 100 emits the light.

  As the light source control device 200, a personal computer (personal computer) shown in FIG. 3 is used. The light source control device 200 includes an operation member 201, a connection IF (interface) 202, a control device 203, an HDD (hard disk drive) 204, and a monitor 205.

  The operation member 201 includes various devices operated by the user, such as a keyboard and a mouse. The connection IF 202 is an interface for connecting the light source device 100. For example, a USB interface for performing a wired connection between the light source device 100 and the light source control device 200, a wireless LAN module for performing a wireless connection, or the like is used. Is done.

  The control device 203 includes a CPU, a memory, and other peripheral circuits, and controls the entire light source control device 200. In addition, the memory which comprises the control apparatus 203 is volatile memory, such as SDRAM, for example. This memory is used as a work memory for the CPU to expand the program when the program is executed, or as a buffer memory for temporarily recording data.

  The HDD 204 is a recording device for recording various programs executed by the control device 203 fetched via the connection IF 202. For example, the HDD 204 records program data for executing processing to be described later. This program is provided by being recorded on a storage medium such as a CD-ROM or a DVD-ROM. In the personal computer 200, the user installs the program data in the HDD 204 using a storage medium, so that the control device 203 can execute the program.

  The monitor 205 is a liquid crystal monitor, for example, and displays an image of display data output from the control device 203.

  In the illumination device 10 in the present embodiment, the user can specify the color of the light emitted from the light source device 100, that is, the color of the output light, by operating the light source control device 200. Light of the color specified by the user is emitted. Hereinafter, a method for specifying the color of irradiation light using the light source control device 200 by the user and the contents of the process for irradiating the light of the color specified by the user from the light source device 100 will be described.

  In the light source control device 200, as shown in FIG. 4, the control device 203 is designated on the chromaticity diagram 4a and the chromaticity diagram 4a for designating the color of light emitted from the light source device 100 by the user. The spectral distribution characteristic 4b of the light of the selected color is displayed on the monitor 205. The user can specify the color of light emitted from the light source device 100 on the chromaticity diagram 4a. For example, the user can designate the color of light by operating the mouse included in the operation member 201 and clicking the point 4c indicating the color to be designated on the chromaticity diagram 4a.

  When a point on the chromaticity diagram 4a is designated by the user, the control device 203 executes the process shown in FIG. 5 so that light of a color corresponding to the point designated on the chromaticity diagram 4a is obtained. And the characteristic, that is, the spectral distribution characteristic 4b is displayed on the monitor 205, and light of the spectral distribution is emitted from the light source device 100.

In step S10, the control device 203 specifies the chromaticity coordinate value (x, y) of the point designated on the chromaticity diagram 4a by the user, and proceeds to step S20. In the present embodiment, the control device 203 emits light from the light source device 100 using the probability density function shown in the following equation (1) based on the chromaticity coordinate values (x, y) specified in step S10. The light spectral distribution f (λ) is calculated. Therefore, in step S20, the control device 203 specifies the center wavelength w of the spectral distribution as an average value in the following equation (1) based on the specified chromaticity coordinate value (x, y), and spectroscopically uses it as a standard deviation. The distribution spread σ is specified.

  Specifically, as shown in FIG. 6, a table in which the chromaticity coordinate value (xi, yi), the center wavelength w and the spread σ are associated with each other is created in advance and recorded in the HDD 204, and the control device 203 The center wavelength w and the spread σ corresponding to the chromaticity coordinate value (x, y) specified with reference to this table are specified.

  Here, a method of calculating the center wavelength w and the spread σ according to the data stored in the table shown in FIG. 6, that is, the chromaticity coordinate values (xi, yi) will be described. Here, it is assumed that the table shown in FIG. 6 is created using the light source control device 200, and the process for creating the table is executed by the control device 203, but is shown in FIG. The table may be created in advance by another device and recorded in the HDD 204.

The control device 203 calculates tristimulus values X, Y, and Z by the following equations (2) to (4) using the spectral distribution f (λ) defined by the above equation (1). In the following expressions (2) to (4), K is a proportional coefficient, and x (λ), y (λ), and z (λ) are color matching functions.

Then, the control device 203 calculates the chromaticity coordinate value (x, y) of the chromaticity diagram based on the tristimulus values X, Y, and Z calculated by the above equations (2) to (4) as the following equation (5). Calculated by (7).

  The control device 203 prepares a table in which the abscissa is x and the ordinate is y, and sequentially changes the values of wi and σi in the combination (wi, σi) of the center wavelength w and the spread σ of the spectral distribution. Using (1) to (6), (xi, yi) for each (wi, σi) is calculated, and the calculated value is written at the position (xi, yi) in the table.

  At this time, the control device 203 fills the table by calculating (xi, yi) while changing the spread σi while keeping the center wavelength wi fixed, and repeating this for each center wavelength wi The table can be filled for the entire range of combinations (wi, σi) of the distribution center wavelength w and the spread σ.

  Specifically, as shown in FIG. 7A, when the center wavelength is fixed to wb and the spread is changed to σ1, σ2, and σ3, the locus shown by the broken line 7b is passed on the chromaticity diagram. . In this case, as shown in FIG. 7B, the spectral distribution 7f with the central wavelength wb and the spread σ1, the spectral distribution 7g with the central wavelength wb and the spread σ2, the central wavelength wb, and the spread σ3. The table can be filled for each of the spectral distributions 7h.

  As shown in FIG. 7A, when the center wavelength is fixed to wd and the spread is changed to σ4, σ5, and σ6, the locus shown by the broken line 7d is passed on the chromaticity diagram. In this case, as shown in FIG. 7C, a spectral distribution 7i with a center wavelength wd and a spread σ4, a spectral distribution 7j with a center wavelength wd and a spread σ5, a center wavelength wd and a spread σ6. The table can be filled for each of the spectral distributions 7k.

  Further, when the center wavelength wi is fixed to wa and the spread is changed, on the chromaticity diagram, the locus shown by the broken line 7a is passed, and when the center wavelength wi is fixed to wc and the spread is changed. On the chromaticity diagram, when passing through the locus indicated by the broken line 7c and changing the spread by fixing the center wavelength wi to we, the locus on the chromaticity diagram passes through the locus indicated by the broken line 7e.

  In the chromaticity diagram, the spectral distribution f (λ) can be calculated using the equation (1) for the color light in the region 8a shown in FIG. 8, but the color light in the region 8b. As for, the spectral distribution f (λ) cannot be calculated only by the equation (1). For example, the spectral distribution of light of the color indicated by the point 9a in the region 8b shown in FIG. 9A can be calculated by adding two spectral distributions as shown in FIG. 9B. Because. For this reason, (xi, yi) cannot be calculated using the above formulas (1) to (6) for the color light in the region 8b, and the table cannot be filled.

In this case, since the control device 203 needs to calculate the spectral distribution by adding two probability density functions, the following equation (8) is used instead of equation (1), and equation (8) and The table can be filled by calculating (xi, yi) using the equations (2) to (6).

  For example, in the present embodiment, in Expression (8), the first center wavelength w1 is set to 420 mm which is the blue center wavelength, and the second center wavelength w2 is set to 680 mm which is the center wavelength of red. The spectral distribution f (λ) is calculated by sequentially changing α in the equation (8) instead of w.

  In FIG. 6, there is (xi, yi) in which no data is written, but values are written in these (xi, yi) by repeating the above process while changing (wi, σi). When the data is finally written for all (xi, yi), the table is completed.

  The control device 203 refers to the table prepared in advance in this manner, and based on the specified chromaticity coordinate value (x, y), the center wavelength w of the spectral distribution, the spread σ of the spectral distribution, Can be specified.

  Thereafter, the process proceeds to step S30, and the control device 203 uses the above formula (1) or formula (8) based on the center wavelength w and the spread σ specified in step S20, and the user on the chromaticity diagram 4a. The spectral distribution f (λ) of the light of the color specified by is calculated. That is, when the user designates a point in the region 8a shown in FIG. 8 on the chromaticity diagram 4a, the control device 203 calculates the spectral distribution f (λ) using the equation (1). . On the other hand, when a point in the region 8b shown in FIG. 8 is designated by the user on the chromaticity diagram 4a, the control device 203 calculates the spectral distribution f (λ) using the equation (8). . Thereafter, the process proceeds to step S40.

  In step S40, the control device 203 displays on the monitor 205 the spectral distribution characteristic 4b indicating the spectral distribution f (λ) calculated in step S30. At this time, as shown in FIG. 4, the control device 204 displays the chromaticity diagram 4a and the spectral distribution characteristic 4b side by side so that the user can select the color selected by himself and the spectral distribution characteristic calculated as a result. Can be compared.

  Thereafter, the process proceeds to step S50, and the control device 203 outputs the spectral distribution data calculated in step S40 to the light source device 100, thereby controlling the spatial modulation element driver 109 of the light source device 100 and performing the calculation in step S40. The light of the spectral distribution is emitted from the light source device 100, and the process is terminated. Through the above processing, the light source device 100 can emit light of the color specified on the chromaticity diagram by operating the light source control device 200 by the user.

According to the present embodiment described above, the following operational effects can be obtained.
(1) The illumination device 10 calculates the spectral distribution of the output light based on the color information designated on the chromaticity diagram 4a by the user in the light source control device 200, and based on the calculated spectral distribution, the light source The apparatus 100 emits light of a color specified by the user. As a result, the user only needs to specify the color on the chromaticity diagram, and therefore, the user can easily specify the color of light desired to be emitted from the light source device 100.

(2) The control device 203 specifies the chromaticity coordinate value corresponding to the specified color on the chromaticity diagram, and based on the specified chromaticity coordinate value, the center wavelength of the spectral distribution representing the specified color and The spread was specified. Then, the spectral distribution of the output light is calculated using the probability density function with the center wavelength as the average value and the spread as the standard deviation. Thereby, the spectral distribution of the light of the color designated by the user can be easily calculated using a known probability density function.

(3) The control device 203 records the central wavelength and spread of the spectral distribution in a table in association with the chromaticity coordinate values, and when the user designates a color on the chromaticity diagram, the table The center wavelength and the spread of the spectral distribution representing the specified color are specified. Accordingly, the center wavelength and spread of the spectral distribution can be easily specified by referring to the information in the table created in advance.

(4) The control device 203 displays the calculation result of the spectral distribution on the monitor 205. As a result, the user can check the spectral distribution characteristics of the light of the designated color on the monitor 205.

-Modification-
In addition, the illuminating device of embodiment mentioned above can also be deform | transformed as follows.
(1) In embodiment mentioned above, the control apparatus 203 calculates the spectral distribution f ((lambda)) of the light irradiated from the light source device 100 using the probability density function shown to Formula (1) or Formula (8). Explained. However, the control device 203 may calculate the spectral distribution f (λ) of light emitted from the light source device 100 using a distribution function of a normal distribution as shown in the following equation (9).

Alternatively, light emitted from the light source device 100 using a rectangular window function as shown in the following equation (10) and FIG. 10 (a) or a triangular window function as shown in the following equation (11) and FIG. 10 (b). The spectral distribution f (λ) may be calculated. In the following equations (10) and (11), the spectral distribution of the output light is calculated using a window function with the center wavelength w as the center value, the spread σ as the width, and these as parameters. Note that the window function is a function that becomes 0 outside a certain finite interval, and is a probability density function expressed by Equation (1) and Equation (8), a distribution function of a normal distribution shown by Equation (9), and Gaussian. Windows and the like are also included in the window function.

(2) In the above-described embodiment, when the point in the region 8a shown in FIG. 8 is designated by the user on the chromaticity diagram 4a, the control device 203 uses the equation (1) to perform spectral analysis. When the distribution f (λ) is calculated and a point in the region 8b shown in FIG. 8 is designated by the user on the chromaticity diagram 4a, the spectral distribution f (λ ) Was calculated. However, it may be determined whether to use equation (1) or equation (8) by the following method. That is, in order to distinguish (xi, yi) calculated using Expression (1) and (xi, yi) calculated using Expression (8) in the table, the control device 203 uses Expression (8). The position of (xi, yi) calculated using () is added to the table with a sign of “−” added to σi. When the control device 203 specifies the combination (wi, σi) of the center wavelength w and the spread σ corresponding to the chromaticity coordinate value (xi, yi) with reference to the table, the control device 203 sets “− ”Is used, the formula (8) may be used, and in other cases, the formula (1) may be used.

(3) In the embodiment described above, the table shown in FIG. 6 is a table corresponding to a (x, y) chromaticity diagram in which the abscissa is x and the ordinate is y, but is not limited thereto. As a table corresponding to a (u, v) chromaticity diagram in which the abscissa is u and the ordinate is v, or a (u ′, v ′) chromaticity diagram in which the abscissa is u ′ and the ordinate is v ′. Also good.

(4) In the above-described embodiment, the example in which the user designates a color by designating one point on the chromaticity diagram 4a has been described. However, the user may designate the color by directly inputting the chromaticity coordinate value. Alternatively, RGB values may be input instead of the chromaticity coordinates, and the control device 203 may convert the input RGB values into chromaticity coordinate values.

(5) In the above-described embodiment, the example in which the light source device 100 changes the light of each wavelength component by the reflective liquid crystal element array device 108 has been described. However, as in the light source device described in Japanese Patent Application Laid-Open No. 2006-184234, the light of each wavelength component may be attenuated using a micromirror.

  Note that the present invention is not limited to the configurations in the above-described embodiments as long as the characteristic functions of the present invention are not impaired. Moreover, it is good also as a structure which combined the above-mentioned embodiment and a some modification.

DESCRIPTION OF SYMBOLS 10 Illumination device, 100 Light source device, 101 White light source, 102, 104 Relay lens, 103 Polarization beam splitter, 105 Collimator lens, 106 Grating, 107 Camera lens, 108 Reflective liquid crystal element array device (spatial modulation element), 109 Spatial modulation Element driver, 110 condenser lens, 111 entrance / exit slit, 112 stray light cut slit, 113 light guide, 200 light source control device, 201 operation member, 202 connection IF (interface), 203 control device, 204 HDD (hard disk drive), 205 monitor

Claims (5)

A designation means for designating the color of the output light on the chromaticity diagram displayed on the display device;
Specifying means for specifying the center wavelength and spread of the spectral distribution of the output light based on the coordinate values on the chromaticity diagram corresponding to the color specified by the specifying means;
Computing means for computing a spectral distribution of the output light from the center wavelength and the spread specified by the specifying means using a first spectral distribution function or a second spectral distribution function;
A spectroscopic means for splitting light emitted from a light source into each wavelength component;
Based on the spectral distribution of the output light computed by the computing means, modulation means for modulating the light of each wavelength component dispersed by the spectral means into the light of each wavelength component of the output light;
Combining means for combining light of each wavelength component of the output light modulated by the modulating means;
Output means for outputting the light synthesized by the synthesis means as the output light,
When the color in the first region of the chromaticity diagram is designated as the color of the output light by the designation means, the calculation means uses the first spectral distribution function to split the output light. When the distribution is calculated and a color in the second region of the chromaticity diagram is designated as the color of the output light by the designation means, the spectrum of the output light is calculated using the second spectral distribution function. A lighting device characterized by calculating a distribution. The lighting device according to claim 1.
The first spectral distribution function is a single function including the center wavelength and the spread as constants,
The second spectral distribution function is a function of adding a single function including the first center wavelength and the spread as a constant and a single function including the second center wavelength and the spread as a constant. A lighting device characterized by that. The lighting device according to claim 1 or 2,
The illumination device characterized in that the first and second spectral distribution functions are window functions. In the illuminating device as described in any one of Claims 1-3 ,
A recording means for recording the central wavelength and the spread of the spectral distribution in association with the coordinate values on the chromaticity diagram;
The illuminating device characterized in that the specifying unit specifies a center wavelength and a spread of a spectral distribution representing the designated color with reference to information recorded in the recording unit. In the illuminating device as described in any one of Claims 1-4 ,
An illumination device further comprising display control means for displaying a calculation result by the calculation means on the display device.

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