JP6893830B2 - Lighting device - Google Patents

Description

The present invention relates to a lighting device used for observation, diagnosis, etc., and more particularly to a lighting device that requires stable light output and color temperature for a long period of time.

Currently, the mainstream of lighting used in medical microscopes is a xenon lamp as a light source. Xenon lamps have the advantage of being brighter than the mainstream halogen lamps before that, but because they are lamps, they not only have a short life, but also have a decrease in light output and changes in color temperature over time, which can be observed for medical purposes. There was an unstable factor for the diagnosis.

On the other hand, recently, semiconductor elements such as LEDs and solid-state lasers have come to be used as light sources for lighting, which dramatically improves the service life as compared with lamp-based lighting and makes it easier to control not only the output but also the color temperature. A stable light output can be obtained for a long time.

As such a conventional example, there is a method of controlling the light output of a plurality of laser light sources by using a plurality of laser light sources (see, for example, Patent Document 1). This is a configuration in which a single output is obtained from a plurality of light sources and then detected by one sensor.

Japanese Unexamined Patent Publication No. 2004-207420

However, in the above-mentioned conventional example, since the outputs of the plurality of light sources are aggregated into a single output and then detected by one sensor, the outputs of the plurality of sensors cannot be individually detected under normal use conditions. In this configuration, in order to detect the output of each light source, adjust the output, and check the light source, multiple light sources are made to emit light in a time-division manner, and then the light output corresponding to each light emission state is generated. It needs to be detected in chronological order.

That is, there is a problem that the adjustment of the light output and the internal inspection are carried out by providing a special state such as an adjustment mode, and the user cannot perform the adjustment without affecting the observation and the diagnosis.

Further, when a plurality of sensors are provided for the purpose of detecting the output of each light source, depending on the wavelength detection characteristics of each sensor, light output in the vicinity which is not intended may be detected. In this case, an error is included in the control output, and there is a problem that accurate optical output control cannot be performed.

The present invention has been made in view of the above problems, and in lighting using a plurality of light sources having different wavelengths, detection and adjustment of light output and color temperature should be performed with minimal influence on the user and with high accuracy. It is an object of the present invention to provide a lighting device capable of performing.

The lighting device according to the present invention is a lighting device used for observation and diagnosis, and is a plurality of light emitting means for emitting light in a plurality of wavelength bands and a plurality of detecting means for detecting the output of the plurality of light emitting means. And a control means for controlling the output of the plurality of light emitting means based on the output of the plurality of detection means, and for extracting the cross talk error based on the output of the plurality of detection means and applying the cross talk correction. The control means further comprises a calculation means for performing the calculation of the above, and the control means controls the plurality of light emitting means so as to have a preset illumination output and a color temperature to adjust the output, and the calculation result of the calculation means. Based on this, the output is adjusted by controlling the plurality of light emitting means in order to apply the crosstalk correction .
Further, the lighting device according to the present invention is a lighting device used for observation and diagnosis, and is a plurality of light emitting means for emitting light in a plurality of wavelength bands and a plurality of light emitting means for detecting the output of the plurality of light emitting means. A detection means and a control means for controlling the output of the plurality of light emitting means based on the output of the plurality of detection means are provided, and the control means emits light so as to have a preset illumination output and a color temperature. When the means are controlled to adjust the output, the plurality of light emitting means are individually emitted during a predetermined monochromatic dimming period, and the plurality of light emitting means are individually emitted during the monochromatic dimming period. A calculation means for extracting a cross talk error based on the output of each of the plurality of detection means and performing a calculation for applying the cross talk correction is further provided, and the control means crosses based on the calculation result of the calculation means. The output is adjusted by controlling the plurality of light emitting means in order to apply the talk correction.

According to the present invention, in a lighting device using a plurality of light emitting means having different wavelength bands, it is possible to detect and adjust the light output and the color temperature with the minimum and accuracy with the minimum influence on the user.

It is a block block diagram of the lighting apparatus which concerns on Embodiment 1 of this invention. It is provided for the description of the lighting apparatus which concerns on Embodiment 1 of this invention, and is a characteristic figure of an emission wavelength and a detection wavelength. It is a block block diagram of the lighting apparatus which concerns on Embodiment 2 of this invention. It is provided for the description of the lighting apparatus which concerns on Embodiment 2 of this invention, and is a characteristic figure of an emission wavelength and a detection wavelength. It is provided for the description of the lighting apparatus which concerns on Embodiment 2 of this invention, and is explanatory drawing of the detection mode control example. It is provided for the description of the lighting apparatus which concerns on Embodiment 2 of this invention, and is explanatory drawing of the detection mode result example. The lighting apparatus is provided in the second embodiment of the present invention, and is an explanatory diagram of an output control correction example.

Embodiment 1.

Hereinafter, the lighting device according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block configuration diagram of a lighting device according to a first embodiment of the present invention. Further, FIG. 2 is provided for explaining the lighting apparatus according to the first embodiment of the present invention, and is a characteristic diagram of an emission wavelength and a detection wavelength.

As shown in FIG. 1, the lighting apparatus according to the first embodiment of the present invention has a blue light emission control unit 2 that controls light emission in the blue wavelength band, a blue light emission unit 3 that emits light in the blue wavelength band, and light emission in the green wavelength band. A green light emitting control unit 4 that controls the light emission control unit 4, a green light emitting unit 5 that emits light in the green wavelength band, a red light emitting control unit 6 that controls light emission in the red wavelength band, a red light emitting unit 7 that emits light in the red wavelength band, and a blue light emitting unit 3. An optical output synthesizer 8 that synthesizes the light output from the green light emitting unit 5 and the red light emitting unit 7, an optical output collecting unit 10 that collects light to detect the light output, and an optical output terminal 11 that outputs the light output to the outside. , Light output detection block 9 that detects the light output collected via the light output collection unit 10, blue light emission control unit 2, green light emission control unit 4, red light emission control unit based on the output from the light output detection block 9. It is provided with a control unit 1 that controls 6 to control light emission in the blue, green, and red wavelength bands.

Here, the optical output detection block 9 includes a blue band filter 12, a blue band detection unit 15, a green band filter 13, a green band detection unit 16, a red band filter 14, a red band detection unit 17, and a detection synthesis unit 18. There is.

Next, the operation of the lighting device according to the first embodiment of the present invention will be described. The control unit 1 turns on the lighting function after a certain period of time after the system is turned on. That is, the blue light emitting control unit 2, the green light emitting control unit 4, and the red light emitting control unit 6 are controlled to emit light from all of the blue light emitting unit 3, the green light emitting unit 5, and the red light emitting unit 7.

At this time, due to the optical output detection block 9, the blue band output passes through the blue band filter 12 and the blue band detection unit 15, the green band output passes through the green band filter 13 and the green band detection unit 16, and the red band output passes through the red band filter 14. And through the red band detection unit 17, respectively.

The control unit 1 adjusts the output by controlling the blue light emission control unit 2, the green light emission control unit 4, and the red light emission control unit 6 so that the illumination output and the color temperature are set in advance. In this example, as shown in FIG. 2, the blue output 21a is set to 0.5, the green output 23 is set to 1.0, and the red output 25 is set to 0.5, respectively. In FIG. 2, 20 indicates a blue band filter characteristic, 22 indicates a green band filter characteristic, and 24 indicates a red band filter characteristic.

In the first embodiment shown in FIG. 1, there are a plurality of light sources, but since the detection unit corresponding to each light source is provided, detection can be performed in real time even in the normal use state of the user, and the detection is always performed. Overall control is possible to check and adjust the best condition. As a result, a long-term stable lighting function suitable for observation and diagnosis by the user can be realized.

In the first embodiment described above, there are three light sources and three detection units, but it goes without saying that the quantity is not limited to this, and if detection can be performed in real time even in a normal use state, the light source and the detection unit can be used. It does not have to be one-to-one. In this case, adjustment error may be included, but it is acceptable as long as there is no problem in actual use.

Further, although the three primary colors of light are used as the visible light emitting means, the light emitting device is not limited to the above-mentioned wavelength, and any light source such as LED or xenon may be used as the light emitting device. Needless to say.

Further, the light emitting method of the light source may be a continuous wave oscillation operation (CW Operation) or a pulse oscillation operation (Pulsed Operation), and under the condition that the same effect can be obtained. Needless to say, any operation may be used.
Furthermore, it goes without saying that it can be widely used in endoscopes and other devices that require a light source that emits excitation light for a fluorescence contrast agent together with visible light.

Embodiment 2.

Next, the lighting device according to the second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block configuration diagram of the lighting device according to the second embodiment of the present invention. Further, FIG. 4 is provided for explaining the lighting apparatus according to the second embodiment of the present invention, and is a characteristic diagram of an emission wavelength and a detection wavelength. Further, FIGS. 5 to 7 are provided for explaining the lighting device according to the second embodiment of the present invention, and are explanatory views showing a sequential detection mode control example, a detection mode result example, and an output control correction example, respectively.

As shown in FIG. 3, the lighting device according to the second embodiment of the present invention has the same control unit 1, blue light emission control unit 2, blue light emitting unit 3, and green color as in the configuration of the first embodiment shown in FIG. It includes a light emission control unit 4, a green light emission control unit 5, a red light emission control unit 6, a red light emission unit 7, a light output synthesis unit 8, a light output collection unit 10, a light output terminal 11, and a light output detection block 9.

Further, as a new configuration, a calculation adjustment unit 19 for extracting a crosstalk error based on the output from the optical output detection block 9 and performing a calculation for applying crosstalk correction is further provided, and the control unit 1 performs a calculation. The detection value and the set value for applying the crosstalk correction are adjusted based on the calculation result of the adjustment unit 19.

The optical output detection block 9 includes a blue band filter 12, a blue band detection unit 15, a green band filter 13, a green band detection unit 16, and a red band filter 14, similar to the configuration of the first embodiment shown in FIG. It includes a red band detection unit 17 and a detection synthesis unit 18.

Next, the operation of the lighting device according to the second embodiment of the present invention will be described. The control unit 1 turns on the lighting function after a certain period of time after the system is turned on. That is, the blue light emitting control unit 2, the green light emitting control unit 4, and the red light emitting control unit 6 are controlled to emit light from all of the blue light emitting unit 3, the green light emitting unit 5, and the red light emitting unit 7.

At this time, due to the optical output detection block 9, the blue band output passes through the blue band filter 12 and the blue band detection unit 15, the green band output passes through the green band filter 13 and the green band detection unit 16, and the red band output passes through the red band filter 14. And through the red band detection unit 17, respectively.

Here, for example, when the blue output is the wavelength characteristic 21b shown in FIG. 4, not only the blue band detection unit 15 having the blue band filter characteristic 20 but also the green band detection unit 16 having the unintended green band filter characteristic 22. It will also be detected from. If these detection results are shown as they are, it is shown in FIG. 7, and the green detection result 27 is higher than the assumed value. In this state, if the control unit 1 adjusts, the green detection result 27 includes the green detection crosstalk error 29, so that the set value is higher than 1.0, and the control unit 1 operates in the direction of suppressing the green color. As a result, the adjustment including the error will be performed. In FIG. 7, 26 shows a blue detection result and 28 shows a red detection result.

Therefore, the arithmetic adjustment unit 19 extracts this error before the adjustment and corrects it at the time of the adjustment. The control unit 1 provides an example of a detection mode for performing the special light emission operation as shown in FIG. 5 only once when the power is turned on for a certain period of time. That is, the blue light emission operation by the blue detection mode control 40 as shown in FIG. By sequentially performing the green light emitting operation by the green detection mode control 41 and the red light emitting operation by the red detection mode control 42, the calculation adjustment unit 19 controls for miscalculation extraction. In the detection mode, each detection unit performs detection in a time series during the light emission period of only each light emitting unit, and generates a detection value matrix. This is an example of the detection mode results shown in FIGS. 6 and 7.

In this result example, as shown in FIGS. 6 and 7, it can be seen that blue light emission is detected as a crosstalk error 29 of 0.2 in the green detection result 27 of the green band detection unit 16. The calculation adjustment unit 19 performs the following matrix calculation based on this, so that it is possible to detect and adjust to the set value after grasping the crosstalk error.

Now, let n be the number of wavelength bands existing in the same color of the illumination, and let Rn, Gn, and Bn be the respective colors that emit light. The light emission of each color is pulse-driven to emit light for each color and for each wavelength band, and the arithmetic adjustment unit 19 obtains the true received value of each color from the following equations (1), (2), and (3). calculate.

The true light receiving value of each color in the photodetector (in this case, the blue output 23 is 0.5, the green output 25 is 1.0, and the red output 0.5 is PRn, PGn, and PBn, respectively. The talk values are XTRn, XTGn, and XTBn, and the light receiving sensitivities of each color in the photodetector are SRn, SGn, and SBn, respectively.

PRn = SRn × (Rn− (XTRn_G + XTRn_B)) ... (1)
PGn = SGn × (Gn- (XTGn_R + XTGn_B)) ... (2)
PBn = SBn × (Bn- (XTBn_R + XTBn_G)) ... (3)

Further, when the photodetector is irradiated with light by an optical component (light output sampling unit 10) such as a light reflecting element as shown in FIG. 3, the light transmittance of each color in the element is set to TRRn, TRGn, and TRBn. .. In that case, the true light receiving value of each color is calculated from the following equations (4), (5), and (6).

PRn = (1 / TRRn) x SRn x (Rn- (XTRn_G + XTRn_B))
... (4)
PGn = (1 / TRGn) × SGn × (Gn- (XTGn_R + XTGn_B))
... (5)
PBn = (1 / TRBn) x SBn x (Bn- (XTBn_R + XTBn_G))
... (6)

By using the above calculation result for each color, calculating the control amount, and transmitting it to the drive unit for each color, it is possible to accurately output each color and control the stable white balance.

As a result, since the error is grasped when the power is turned on, accurate detection can be performed even in real time in the normal use state, and overall control is possible because the best state is always confirmed and adjusted. This makes it possible for the user to realize a long-term stable lighting function suitable for observation and diagnosis.

By such control, the blue light emitting unit 3 emits light in the blue wavelength band, the green light emitting unit 5 emits light in the green wavelength band not including the blue wavelength band, and the red light emitting unit 7 emits light in the blue wavelength band and green. It emits light in the red wavelength band that does not include the wavelength band.

In the second embodiment described above, there are three light sources and three detection units, but it goes without saying that the quantity is not limited to this, and if detection can be performed in real time even in a normal use state, the light source and the detection unit can be used. It does not have to be one-to-one. In this case, adjustment error may be included, but it is acceptable as long as there is no problem in actual use.

Further, although the three primary colors of light are used as the visible light emitting means, the light emitting device is not limited to the above-mentioned wavelength, and any light source such as LED or xenon may be used as the light emitting device. Needless to say.

Further, the light emitting method of the light source may be a continuous wave oscillation operation (CW Operation) or a pulse oscillation operation (Pulsed Operation), and under the condition that the same effect can be obtained. Needless to say, any operation may be used.
Furthermore, it goes without saying that it can be widely used in endoscopes and other devices that require a light source that emits excitation light for a fluorescence contrast agent together with visible light.

Furthermore, it goes without saying that it can be widely used in endoscopes and other devices that require a light source that emits excitation light for a fluorescence contrast agent together with visible light.

According to each of the above-described embodiments, even in a single output state, the individual outputs of the plurality of light emitting means can be detected in real time in a normal continuous light emitting state.

In addition, the detection mode and the calculation means can detect an unintended wavelength output that causes a control error.

Further, by using a solid-state light source as the light emitting means, fine control is possible and stable performance can be ensured for a long time.

1 Control unit 2 Blue light emission control unit 3 Blue light emission control unit 4 Green light emission control unit 5 Green blue light emission control unit 6 Red light emission control unit 8 Light output synthesis unit 9 Light detection block 12 Arithmetic adjustment unit 20 Blue band filter characteristics 22 Green band filter characteristics 24 Red band filter characteristics 21a Blue output 1
21b blue output 2
26 Blue detection result 27 Green detection result 28 Red detection result 29 Green detection crosstalk error 40 Blue detection mode control 41 Green detection mode control 42 Red detection mode control

Claims (7)

A lighting device used for observation and diagnosis.
Multiple light emitting means for emitting light in multiple wavelength bands,
A plurality of detecting means for detecting the output of the plurality of light emitting means, and
A control means for controlling the output of the plurality of light emitting means based on the output of the plurality of detection means is provided.
A calculation means for extracting a crosstalk error based on the outputs of the plurality of detection means and performing a calculation for applying crosstalk correction is further provided.
The control means
The output is adjusted by controlling the plurality of light emitting means so that the illumination output and the color temperature are set in advance .
A lighting device characterized in that the output is adjusted by controlling the plurality of light emitting means in order to apply the crosstalk correction based on the calculation result of the calculation means. A lighting device used for observation and diagnosis.
Multiple light emitting means for emitting light in multiple wavelength bands,
A plurality of detecting means for detecting the output of the plurality of light emitting means, and
A control means for controlling the output of the plurality of light emitting means based on the output of the plurality of detection means is provided.
The control means controls the plurality of light emitting means so as to have a preset illumination output and a color temperature to adjust the output, and individually controls the plurality of light emitting means in a predetermined monochromatic dimming period. Make it emit light
An arithmetic means for extracting a crosstalk error based on the output of each of the plurality of detection means when the plurality of light emitting means individually emits light in the monochromatic dimming period and performing an operation for applying crosstalk correction. Further prepare
The lighting device is characterized in that the control means controls the plurality of light emitting means to adjust the output in order to apply crosstalk correction based on the calculation result of the calculation means. The plurality of light emitting means
The first light emitting means for emitting light in the first wavelength band,
A second light emitting means that emits light in the second wavelength band,
To together as having a third light-emitting means for emitting light of a third wavelength band,
The plurality of detection means
The first detecting means for detecting the output of the first light emitting means and
The second detecting means for detecting the output of the second light emitting means and
It has a third detecting means for detecting the output of the third light emitting means.
The control means controls the outputs of the first light emitting means, the second light emitting means, and the third light emitting means based on the outputs of the first detecting means, the second detecting means, and the third detecting means. The lighting device according to claim 1 or 2. The calculating means, <br/> said first detecting means, extracts the crosstalk error based on an output of the second detecting means and said third detecting means performs an operation for applying the crosstalk correction The lighting device according to claim 3. 3. The control means according to claim 3 or 4 , wherein the control means controls the outputs of the first light emitting means, the second light emitting means, and the third light emitting means by driving by a continuous wave oscillation operation or a pulse oscillation operation. The lighting device described. The lighting device according to any one of claims 3 to 5 , wherein an LED light source is used for the first light emitting means, the second light emitting means, and the third light emitting means. The lighting device according to any one of claims 3 to 5 , wherein a laser light source is used for the first light emitting means, the second light emitting means, and the third light emitting means.

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