WO2015005277A1 - 光源装置 - Google Patents
光源装置 Download PDFInfo
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- WO2015005277A1 WO2015005277A1 PCT/JP2014/068041 JP2014068041W WO2015005277A1 WO 2015005277 A1 WO2015005277 A1 WO 2015005277A1 JP 2014068041 W JP2014068041 W JP 2014068041W WO 2015005277 A1 WO2015005277 A1 WO 2015005277A1
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- Prior art keywords
- light source
- semiconductor light
- light
- led
- driving
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00002—Operational features of endoscopes
- A61B1/00004—Operational features of endoscopes characterised by electronic signal processing
- A61B1/00006—Operational features of endoscopes characterised by electronic signal processing of control signals
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00002—Operational features of endoscopes
- A61B1/00004—Operational features of endoscopes characterised by electronic signal processing
- A61B1/00009—Operational features of endoscopes characterised by electronic signal processing of image signals during a use of endoscope
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00002—Operational features of endoscopes
- A61B1/0002—Operational features of endoscopes provided with data storages
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
- A61B1/045—Control thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
- A61B1/0638—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements providing two or more wavelengths
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
- A61B1/0655—Control therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
- A61B1/0661—Endoscope light sources
- A61B1/0669—Endoscope light sources at proximal end of an endoscope
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
- A61B1/0661—Endoscope light sources
- A61B1/0684—Endoscope light sources using light emitting diodes [LED]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2461—Illumination
- G02B23/2469—Illumination using optical fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
Definitions
- the present invention relates to a light source device suitable for an endoscope.
- a light source device is employed to perform imaging inside the cavity.
- a light source device employing a semiconductor light source such as an LED as a light emitting unit may be used.
- Such a light source device can perform dimming control of the LED by PWM control that changes the duty ratio of the drive pulse or current control that changes the LED current.
- Document 1 As a light source device using such an LED light source, there is a device disclosed in WO2012 / 108420 (hereinafter referred to as Document 1).
- the apparatus of Document 1 enables special light observation such as normal observation (WLI) with white illumination and narrow-band observation (NBI) with purple illumination by combining a white LED and a purple LED.
- WLI normal observation
- NBI narrow-band observation
- the device of Document 1 may cause insufficient illumination.
- an endoscope provided with an image sensor is configured to be connectable.
- the spectrum of the emitted light of the white LED is constant, it corresponds to the spectral sensitivity characteristics of the image sensor. It is not always possible to obtain illumination light with an optimal color balance. For this reason, it is conceivable to use LEDs of a plurality of colors as the light source. However, it is considered that the dimming control is performed in a state where the color balance, which is the ratio of the amount of light emitted from the LEDs of the plurality of colors, is maintained at an optimum value. There wasn't.
- An object of the present invention is to provide a light source device capable of performing dimming control while maintaining a color balance at an optimum value.
- a light source device includes a plurality of semiconductor light sources that emit light in different wavelength bands, and a drive signal that drives one reference semiconductor light source among the plurality of color semiconductor light sources based on brightness control information.
- a current value and a duty ratio are determined, and a current value of a drive signal for driving a semiconductor light source other than the reference semiconductor light source among the semiconductor light sources of the plurality of colors is based on a current value of a drive signal for driving the reference semiconductor light source.
- a control unit that generates dimming information for dimming control of the semiconductor light sources of a plurality of colors, and a drive unit that drives the semiconductor light sources of the plurality of colors based on the dimming information Comprising.
- the block diagram which shows the light source device which concerns on the 1st Embodiment of this invention. 6 is a graph for explaining an example of information stored in a memory unit 53.
- FIG. 1 is a block diagram showing a light source device according to the first embodiment of the present invention.
- the light source device is applied to an endoscope system having an endoscope, a video processor, and a monitor.
- the endoscope system 1 includes an endoscope 10, a video processor 20, a monitor 30, and a light source device 40.
- the endoscope 10 has an elongated insertion portion 11 that can be inserted into a lumen or the like at the distal end side, and the proximal end side is detachably connected to the light source device 40 by a connector 12. ing.
- the endoscope 10 is detachably connected to the video processor 20 by a cable 17 and a connector 18.
- a cable 17 and a connector 18 can be attached to the light source device 40 and the video processor 20.
- an imaging element 13 for capturing an image of a subject such as in a lumen and a lens 14 for irradiating the subject with light from the light source device 40 are disposed.
- the illumination light transmitted from the light source device 40 via the light guide 15 is irradiated to the subject by the lens 14.
- the imaging element 13 is configured by a CCD, a CMOS sensor, or the like. Return light from the subject is incident on the imaging surface, photoelectrically converts the incident subject optical image, and sequentially outputs imaging outputs based on the accumulated charges.
- the image sensor 13 operates when a drive signal including a synchronization signal is supplied from the video processor 20, and supplies an imaging output to the video processor 20 via the signal line 16.
- the image sensor 13 has a predetermined spectral sensitivity characteristic.
- the characteristic of the captured image changes for each endoscope mainly due to the influence of the spectral sensitivity characteristic of the image sensor.
- the endoscope 10 is provided with a storage unit 19 that stores scope information including information on spectral sensitivity characteristics for each endoscope. By connecting the endoscope 10 to the light source device 40 by the connector 12, scope information can be acquired in the light source device 40.
- the video processor 20 performs predetermined signal processing on the imaging output to generate a video signal that can be displayed on the monitor 30.
- a video signal from the video processor 20 is supplied to the monitor 30 via the cable 21. In this way, an endoscopic image based on the imaging output can be displayed on the display screen of the monitor 30.
- the video processor 20 can control the light source device 40 so that the brightness of the captured image becomes the target brightness.
- the video processor 20 outputs information on the ratio between the brightness obtained from the captured image and the target brightness to the light source device 40 as brightness control information.
- the brightness control information is supplied to the control unit 41 of the light source device 40 via the cable 22.
- the light source device 40 includes an LED (R-LED) 42 that generates red light, an LED (G-LED) 43 that generates green light, an LED (B-LED) 44 that generates blue light, and an LED that generates purple light. (V-LED) 45 is included. Note that, in this embodiment, an example in which LEDs that generate four colors of light are employed will be described, but the types of colors and the number of colors are not limited to those in this embodiment. In this embodiment, a plurality of types of LEDs may be used. For example, an LED that generates amber light may be added to FIG.
- Lenses 42a to 45a are arranged on the optical axes of the emitted light from the LEDs 42 to 45, respectively. Each of the lenses 42a to 45a converts the light emitted from the LEDs 42 to 45 into substantially parallel light and emits the light. On the optical axis of the lens 42a that emits light from the R-LED 42, dichroic filters 47 to 49 constituting an optical path portion are arranged. Light from the G-LED 43 is also incident on the dichroic filter 47 through the lens 43a. In addition, light from the B-LED 44 is incident on the dichroic filter 48 via the lens 44a, and light from the V-LED 45 is also incident on the dichroic filter 49 via the lens 45a.
- the dichroic filter 47 reflects the light from the G-LED 43 and transmits the light from the R-LED 42.
- the dichroic filter 48 reflects the light from the B-LED 44 and transmits the light transmitted through the dichroic filter 47.
- the dichroic filter 49 reflects the light from the V-LED 45 and transmits the light transmitted through the dichroic filter 48.
- the light from the LEDs 42 to 45 is synthesized by the dichroic filters 47 to 49.
- the combined light from the dichroic filter 49 is incident on the light guide 15 via the lens 50.
- the arrangement order of the LEDs 42 to 45 can be changed by appropriately setting the characteristics of the dichroic filters 47 to 49, the characteristics of the dichroic filter can be improved by arranging the LEDs 42 to 45 in the wavelength band of the emitted light. Is easy to set.
- the LEDs 42 to 45 are driven by the LED drive unit 46 and light up.
- the LED drive unit 46 is controlled by the control unit 41 to generate a PWM pulse that is a drive signal for driving each LED.
- Each of the LEDs 42 to 45 emits light with a light emission amount corresponding to the duty ratio and current amount of the PWM pulse from the LED drive unit 46.
- the control unit 41 outputs the dimming information for controlling each of the LEDs 42 to 45 to the LED driving unit 46, thereby controlling the duty ratio and the current level of the PWM pulse to control the dimming of each of the LEDs 42 to 45.
- the control unit 41 generates dimming information so that the light emission amounts of the LEDs 42 to 45 can maintain a predetermined color balance.
- the color balance of each LED 42 to 45 needs to be determined by the spectral sensitivity characteristics of the endoscope 10.
- the reading unit 51 provided in the light source device 40 reads out the scope information recorded in the storage unit 19 and outputs it to the control unit 41. ing.
- the control unit 41 determines the ratio (light quantity ratio) of the light emission amounts of the LEDs 42 to 45, and controls the light emission quantities of the LEDs 42 to 45 so as to maintain this light quantity ratio. Yes.
- the storage unit 19 has been described as holding information on the spectral sensitivity characteristics of the image sensor, the storage unit 19 is configured to store information on the emitted light amount ratios of the LEDs 42 to 45 based on the spectral sensitivity characteristics. Also good.
- the light source device 40 is provided with an operation panel 52, and the operation panel 52 can output a signal based on a user operation to the control unit 41.
- the operation panel 52 it is also possible to input information related to the spectral sensitivity characteristics of the endoscope 10.
- the operation panel 52 is provided with a display unit (not shown) so that the current set value and the like can be displayed.
- the control unit 41 controls the light quantity of each of the LEDs 42 to 45 while maintaining the light quantity ratio with which an optimum color balance is obtained based on the brightness control information from the video processor 20. For example, the control unit 41 obtains dimming information corresponding to the light amount value of the G-LED 43 to be set according to the brightness control information, and the other LEDs 42, 44, and 45 have light amount ratios based on the scope information. Asking for dimming information.
- the memory unit 53 stores a table describing dimming information corresponding to the light amount value of the G-LED 43 to be set according to the brightness control information.
- the control unit 41 is based on the brightness control information.
- the dimming information for controlling the G-LED 43 can be acquired by reading the dimming information stored in the memory unit 53.
- FIG. 2 is a graph for explaining an example of information stored in the memory unit 53.
- 2A shows PWM control for the G-LED 43 with the LED control value corresponding to the brightness control information on the horizontal axis and the duty ratio on the vertical axis
- FIG. 2B shows the brightness control on the horizontal axis.
- the LED control value corresponding to the information is taken, and the current value on the vertical axis is taken to indicate the current control for the G-LED 43.
- the control unit 41 sets the LED control value corresponding to the minimum light amount of the G-LED 43 to “1”, sets the LED control value corresponding to the maximum light amount to “65535”, and sets the light amount of the G-LED 43. Control is possible in 65536 stages.
- the control unit 41 can control the duty ratio of the PWM pulse for the G-LED 43 between 0.1% (pulse width 16.68 ⁇ sec) to 100% (pulse width 16.68 msec).
- the pulse current value can be controlled between a minimum of 1 A and a maximum of 20 A.
- the control unit 41 changes the duty ratio of the G-LED 43 while setting the current value to the lowest 1A until the duty ratio reaches 100%.
- dimming control from the darkest LED control value “1” to the LED control value “TH” is performed.
- the control unit 41 performs dimming control from the LED control value “TH” to the brightest LED control value “65535” with the duty ratio being 100%.
- the control unit 41 reads the duty ratio and the current value corresponding to the LED control value based on the input brightness control information from the table corresponding to FIG. Dimming information for designating the read duty ratio and current value is generated as dimming information for controlling the G-LED 43.
- the control unit 41 obtains current values to be set for the other LEDs 42, 44, and 45 based on the current value set for the G-LED 43 and the ratio based on the scope information.
- the control unit 41 sets the same duty ratio as that of the LED 43 for the LEDs 42, 44, and 45.
- the control unit obtains the dimming information to be set for the other LEDs 42, 44, 45.
- the control unit 41 outputs the dimming information obtained for controlling the LEDs 42 to 45 to the LED driving unit 46.
- the control unit 41 changes the duty ratio of the PWM pulse while keeping the current amount constant from the darkest light amount to a predetermined light amount with a duty ratio of 100%.
- the brightness is adjusted by the control, and the brightness is adjusted by the current control that changes the LED current in a state where the duty ratio is maintained at 100% from the predetermined light amount to the maximum light amount where the duty ratio becomes 100%.
- the pulse period of the PWM pulse that is, the period for supplying the LED current is made the same for all the LEDs 42 to 45.
- all the LEDs 42 to 45 are lit at the same time, and it is possible to prevent the image quality from being deteriorated due to the change in the color balance even when imaging a fast-moving subject.
- the pulse width of PWM drive is the same among the LEDs 42 to 45, the light amount ratio between the LEDs 42 to 45 can be controlled only by the ratio of the current amount, and dimming control is easy.
- the control unit 41 obtains a current value for dimming control of the LED 43 based on the brightness control information with reference to one LED 43 among the LEDs 42 to 45, and the other LEDs 42, 44, 45
- the example in which the current value is obtained by the ratio based on the current value of the reference LED 43 and the scope information has been described, but the reference LED may be set to another LED other than the LED 43. Further, without using the reference LED, the same information as in FIG. 2 is obtained for all LEDs at a ratio based on the scope information, and the control value of each LED is directly read based on the brightness control information. Also good.
- FIG. 3 is a flowchart for explaining dimming control according to the first embodiment.
- FIG. 4 is an explanatory diagram for explaining drive pulses supplied to the LEDs 42 to 45.
- the reading unit 51 reads out the scope information stored in the storage unit 19 of the endoscope 10 and outputs it to the control unit 41.
- the control part 41 acquires scope information (step S1).
- the control unit 41 acquires brightness control information from the video processor 20.
- the control unit 41 accesses the memory unit 53 based on the brightness control information, and acquires a control value (current value and duty ratio) for controlling the G-LED 43 serving as a reference LED (step S3).
- the control unit 41 calculates the current values of the other LEDs 42, 44, and 45 with the light amount ratio based on the scope information using the current value of the LED 43 as a reference (step S4).
- the control unit 41 generates dimming information for designating the current value and the duty ratio obtained for each of the LEDs 42 to 45 (step S5), and outputs it to the LED driving unit 46 (step S6).
- the LED driver 46 generates a PWM pulse having a duty ratio and a current value based on the dimming information and supplies the PWM pulses to the LEDs 42 to 45.
- the LEDs 42 to 45 generate a light amount of light based on the dimming information.
- Light emitted from the LEDs 42 to 45 is synthesized by the dichroic filters 47 to 49 and enters the light guide 15 through the lens 50 as illumination light.
- the illumination light transmitted through the light guide 15 is irradiated to the subject from the lens 14.
- the image sensor 13 receives reflected light from the subject and photoelectrically converts it to obtain a captured image.
- This captured image is supplied to the video processor 20 via the signal line 16.
- the video processor 20 performs predetermined signal processing on the captured image to generate a video signal, and supplies the video signal to the monitor 30 via the cable 21.
- the endoscopic image is displayed on the display screen of the monitor 30.
- the video processor 20 generates brightness control information by comparing the brightness of the captured image with the target brightness. For example, the video processor 20 generates brightness control information for each field and outputs the brightness control information to the control unit 41 of the light source device 40.
- control unit 41 generates dimming information based on the brightness control information for each field, for example, so that the amount of illumination light by the combined light emitted from the LEDs 42 to 45 reaches the target brightness. Take control.
- FIG. 4 shows an example of PWM pulses supplied to the LEDs 42 to 45 for each field with time on the horizontal axis.
- Red, Green, Blue, and Violet in FIG. 4 indicate PWM pulses supplied to the LEDs 42 to 45, respectively.
- the shaded area in FIG. 4 indicates the period during which the LED current is supplied, and the height of the shaded area indicates the amount of current. As shown in FIG. 4, all the LEDs 42 to 45 are lit when supplied with current during a common period. Further, the height of the shaded portion corresponds to the light amount ratio based on the scope information.
- Dimming control from the dark state until the duty ratio reaches 100% is performed by controlling the duty ratio. When the duty ratio reaches 100%, dimming is performed by current control when the brightness is further increased.
- illumination light is obtained by synthesizing light emitted from a plurality of (four in FIG. 1) LEDs, and illumination light corresponding to the spectral sensitivity characteristics of the endoscope can be easily obtained. It is possible to obtain sufficient brightness as illumination light.
- each LED is PWM-controlled and current-controlled, and even when a relatively wide dimming range needs to be ensured, the upper limit of the current amount can be set relatively low, enabling a long life. be able to.
- each LED is controlled to be turned on by a PWM pulse having a common duty ratio, so that uniform illumination can be obtained.
- the light quantity ratio between the LEDs is controlled by the amount of current, and the brightness can be controlled relatively easily while keeping the light quantity ratio between the LEDs constant.
- the light quantity ratio of each LED is set based on the spectral sensitivity characteristics of the endoscope, and illumination light having a desired brightness can be obtained while maintaining an optimal color balance for the connected endoscope.
- FIG. 5 is a block diagram showing a second embodiment of the present invention.
- the LED has temperature characteristics, and the amount of light changes depending on the temperature even if the LED current value is the same. Since the LED has a characteristic that the temperature rises with light emission, it is necessary to consider the temperature characteristic in order to accurately control the amount of illumination light. In the present embodiment, it is possible to perform dimming control while maintaining color balance regardless of such temperature characteristics.
- FIG. 6 is a graph showing changes in the light amount when the LED is driven at a predetermined constant current value with the LED temperature on the horizontal axis and the light amount on the vertical axis.
- the characteristics of the LEDs 42 to 45 are indicated by R, G, B, and V. As shown in FIG. 6, even if each LED is driven at a predetermined current value, the light emission amount of each LED changes as the LED temperature changes. Moreover, the change characteristics differ for each type of LED.
- the LEDs are arranged relatively close to each other in the light source device, and the temperature change due to each LED alone is measured. It is difficult to do. Therefore, in the present embodiment, the current value is controlled by obtaining the light quantity of each LED.
- the endoscope system 60 in FIG. 5 is different from the embodiment in FIG. 1 in that a light source device 61 having optical sensors 42b to 45b is employed.
- the optical sensors 42b to 45b are arranged at positions where the emitted lights of the LEDs 42 to 45 can be detected, respectively, detect the light emission amounts of the LEDs 42 to 45, and output the detection results to the control unit 41.
- the optical sensors 42b to 45b are arranged at positions other than on the optical path from the LEDs 42 to 45 to the lenses 42a to 45a.
- the control unit 41 reads the information in the memory unit 53 based on the brightness control information, and obtains the current value and the duty ratio of the G-LED 43.
- the control unit 41 corrects the light amount ratio based on the scope information of the endoscope 10 based on the detection results of the optical sensors 42b to 45b, so that the optimum light amount ratio is maintained without changing the temperature characteristics. To get to.
- FIG. 7 is a flowchart for explaining dimming control in the second embodiment.
- the same steps as those in FIG. 7 are identical steps as those in FIG. 7
- the point of controlling the current value and duty ratio of the reference LED based on the brightness control information is the same as in the first embodiment.
- the color balance will not be lost.
- the actual emission from each of the LEDs 42 to 45 is made by the optical sensors 42b to 45b so that the emitted light amount matches the emission light amount ratio set based on the spectral sensitivity characteristic information stored as the scope information in the storage unit 19. The amount of light is monitored, and the current value of the drive signal supplied to each LED is corrected according to the result.
- the optical sensors 42b to 45b detect the light amounts of the LEDs 42 to 45, respectively, and output the detection results to the control unit 41.
- the control unit 41 acquires the detection results of the optical sensors 42b to 45b.
- the control unit 41 obtains a control value (current value and duty ratio) for the reference LED based on the brightness control information (step S3). For example, the control unit 41 obtains the current value and the duty ratio of the G-LED 43 in step S3.
- step S12 the control unit 41 compares the light quantity ratio between the reference LED and the other LEDs based on the scope information, and the light quantity ratio between the reference LED actually obtained by the optical sensors 42b to 45b and each other LED. Based on the previous control value, the control value of the current value supplied to the other LEDs is obtained for each of the other LEDs.
- the duty ratios of the drive pulses of the other LEDs 42, 44, 45 are made to coincide with the duty ratio of the G-LED 43 set in step 3, and the current value is determined by the light quantity ratio based on the scope information and the optical sensors 42b to 45b. It is increased or decreased in the control cycle so that the actually obtained light quantity ratio matches.
- the ratio of the LED current of the R-LED 43 to the LED current of the G-LED 43 is The current value of the R-LED 43 is set so as to be larger than in the previous control.
- the control unit 41 obtains the current value of the R-LED 42 using the scope information and the previous control value, the light amount ratio of the R-LED 42 matches the light amount ratio based on the scope information.
- the LED current values of the LEDs 42 to 45 are controlled so that the actual light amount ratio matches the light amount ratio based on the scope information.
- control unit 41 may calculate the correction amount of the current value of the other LEDs 42, 44, 45 for each output of the dimming information.
- the control unit 41 generates dimming information corresponding to the obtained current value and duty ratio, and outputs it to the LED driving unit 46.
- the LED 46 controls lighting of the LEDs 42 to 45 based on the input dimming information.
- the current value of each LED is calculated based on the scope information and the correction amount corresponding to the actual light amount, and the actual light amount of each LED 42 to 45 matches the light amount ratio based on the scope information.
- the brightness of the illumination light is controlled by controlling the brightness of the reference LED based on the brightness control information, the actual light quantity is measured, and the actual light quantity ratio becomes the light quantity ratio based on the scope information.
- the current value of each LED is controlled so as to match, and illumination light with a desired brightness can be obtained while maintaining an optimum color balance for the connected endoscope regardless of temperature characteristics.
- FIG. 8 is a block diagram showing a third embodiment of the present invention.
- the actual light quantity ratio can be matched with the light quantity ratio according to the scope information by measuring the light quantity of each of the LEDs 42 to 45 by the optical sensors 42b to 45b.
- this embodiment is different from the second embodiment in that detection errors due to the arrangement of the optical sensors 42b to 45b are corrected.
- FIG. 9 is an explanatory diagram for explaining light incident on the optical sensors 42b to 45b.
- the endoscope light source is required to be miniaturized, and it is conceivable that the LEDs and the optical sensors are arranged close to each other.
- FIG. 9 shows the two LEDs 81 and 85 arranged close to each other in this way.
- Lenses 82 and 86 are disposed on the optical axes of the LEDs 81 and 85, respectively.
- the lenses 82 and 86 convert the light emitted from the LEDs 81 and 85 into substantially parallel light, respectively.
- a light sensor 84 for detecting the light quantity of each LED 81, 85 is provided in the range 83, 87 of each emitted light of each LED 81, 85.
- FIG. 9 shows only the optical sensor 84 that detects the light amount of the LED 81.
- the optical sensor 84 is disposed within the range 83 of the emitted light from the LED 81 and detects the light from the LED 81.
- part of the light emitted from the LED 85 also enters the optical sensor 84. For this reason, the optical sensor 84 cannot accurately detect the light emitted from the LED 81.
- FIG. 9A shows an example in which a light shielding wall 88 is disposed between the LEDs 81 and 85 in order to suppress detection of leakage light from adjacent LEDs.
- the light from the LED 85 enters the optical sensor 84 through the gap between the light shielding walls 88.
- each optical sensor detects only specific color light by using a photosensor having a color filter disposed on the incident surface can be considered, but it has a disadvantage of increasing the cost.
- the detection accuracy of the optical sensors 42b to 45b is improved, and the light quantity ratio of each LED 42 to 45 is appropriately controlled. make it possible to do.
- the endoscope system 70 of FIG. 8 is different from the embodiment of FIG. 2 in that a light source device 71 in which a detection result correction unit 72 is added to the control unit 41 is adopted.
- the detection result correction unit 72 corrects the detection results of the optical sensors 42b to 45b by matrix calculation.
- a correction matrix used for matrix calculation performed by the detection result correction unit 72 is stored in the memory unit 53.
- the memory unit 53 stores a correction matrix A expressed by the following equation (1) or its inverse matrix.
- This correction matrix A is obtained when n light sensors and n light sensors arranged so as to detect the light quantity of these n LEDs are provided in the light source device. This is for correcting the detection result.
- the correction matrix A is set with a coefficient, for example, at the time of factory shipment. This coefficient can be determined based on the detection result of each optical sensor in a state where the LED is turned on for one color and the measurement result of the amount of light emitted from the apparatus. All the coefficients of the matrix A can be determined by sequentially performing this for all the LEDs.
- the coefficient ajk in the correction matrix A indicates the ratio of the detection result of the kth photosensor with respect to the jth LED light amount. For example, when only the first LED is turned on, the detection of the kth photosensor is performed.
- the ratio between the result Sk and the light source device light amount LED1 is a1k. That is, the detection result of each optical sensor is the sum of the light amount of the LED to be detected and the light amount (noise light) of the LED other than the detection target, and this relationship is represented by the following relational expression (2).
- the detection result correction unit 72 removes the influence of the light amount of the LED that is not the detection target by the calculation shown in the following formula (3), that is, the calculation that multiplies the detection result S of each optical sensor by the inverse matrix of the correction matrix A.
- the light quantity of the LED (the light quantity of the detection target LED) can be acquired.
- the correction matrix A for correcting the output of each of the optical sensors 42b to 45b or the inverse matrix thereof is held in the memory unit 53 in advance, and the optical calculation is performed by performing matrix calculation. Based on the detection results of 42b to 45b, the light amounts of the LEDs 42 to 45 can be accurately detected. As a result, even when the LED and the optical sensor are arranged close to each other, the light quantity of each LED is accurately detected, and the dimming control of each LED is accurately performed so that the light quantity ratio according to the scope information is obtained. Can do. Other functions and effects are the same as those of the second embodiment.
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Abstract
Description
図1は本発明の第1の実施の形態に係る光源装置を示すブロック図である。本実施の形態は、光源装置を内視鏡、ビデオプロセッサ及びモニタを有する内視鏡システムに適用したものである。
図5は本発明の第2の実施の形態を示すブロック図である。図5において図1と同一の構成要素には同一符号を付して説明を省略する。第1の実施の形態においては、各LED42~45の光量は電流値に比例するものとして説明した。しかし、実際には、LEDは温度特性を有し、同一LED電流値であっても温度によって光量が変化する。LEDは、発光に伴って温度上昇する特性を有しているので、照明光量を正確に制御するためには、温度特性を考慮する必要がある。本実施の形態は、このような温度特性に拘わらず、カラーバランスを維持しながら調光制御することを可能にしたものである。
図8は本発明の第3の実施の形態を示すブロック図である。図8において図5と同一の構成要素には同一符号を付して説明を省略する。第2の実施の形態においては、光センサ42b~45bによって各LED42~45の光量を計測することで、実際の光量比をスコープ情報に応じた光量比に一致させることを可能にした。しかし、光センサ42b~45bの配置によっては、各LED42~45の光量を正確に計測できないことが考えられる。そこで、本実施の形態は、光センサ42b~45bの配置等による検出誤差を補正するようにした点が第2の実施の形態と異なる。
本出願は、2013年7月11日に日本国に出願された特願2013-145726号を優先権主張の基礎として出願するものであり、上記の開示内容は、本願明細書、請求の範囲、図面に引用されたものとする。
Claims (7)
- 互いに異なる波長帯域の光を出射する複数の半導体光源と、
明るさ制御情報に基づいて前記複数色の半導体光源のうちの1つの基準半導体光源を駆動する駆動信号の電流値及びデューティ比を決定し、前記複数色の半導体光源のうちの前記基準半導体光源以外の半導体光源を駆動する駆動信号の電流値を前記基準半導体光源を駆動する駆動信号の電流値に基づいて決定し、前記複数色の半導体光源のうちの前記基準半導体光源以外の半導体光源を駆動する駆動信号のデューティ比を前記基準半導体光源を駆動する駆動信号のデューティ比に一致させるよう決定して、前記複数色の半導体光源を調光制御するための調光情報を発生する制御部と、
前記調光情報に基づいて前記複数色の半導体光源を駆動する駆動部と
を具備したことを特徴とする光源装置。 - 前記制御部は、前記複数の半導体光源から出射される照明光の光量バランスを表す目標カラーバランス値に基づいて、前記基準半導体光源を駆動する駆動信号の電流値から、前記基準半導体光源以外の各半導体光源を駆動する各駆動信号の電流値を決定する
ことを特徴とする請求項1に記載の光源装置。 - 前記照明光を利用して撮像部により撮像を行う内視鏡から、前記目標カラーバランスを得るための光量比の情報を取得する情報取得部
を具備したことを特徴とする請求項2に記載の光源装置。 - 前記制御部は、前記デューティ比が100%に到達するまではPWM制御による調光情報を発生し、前記デューティ比が100%に到達すると電流制御による調光情報を発生する
ことを特徴とする請求項1乃至3のいずれか1つに記載の光源装置。 - 前記複数色の半導体光源のそれぞれに対応付けて設けられて各半導体光源から出射される光の光量を検知する複数の光検知部を備え、
前記制御部は、前記複数の光検知部の検知結果に基づいて、前記基準半導体光源を駆動する駆動信号の電流値に基づいて決定した前記基準半導体光源以外の半導体光源を駆動する駆動信号の電流値を補正する
ことを特徴とする請求項1乃至4のいずれか1つに記載の光源装置。 - 前記複数の光検知部の各検知結果から、各光検知部の検知対象外の前記半導体光源からの光量分を除去して、各光検知部の検知対象の前記半導体光源からの光量のみを抽出する検知結果補正部
を具備したことを特徴とする請求項5に記載の光源装置。 - 各半導体光源がそれぞれ単独で発光した場合の各半導体光源からの光に基づく前記複数の光検知部の検知結果により生成した補正マトリクスを記憶するメモリ部を具備し、
前記検知結果補正部は、前記複数の光検知部の検知結果を前記補正マトリクスを用いたマトリクス演算によって補正する
ことを特徴とする請求項6に記載の光源装置。
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| EP14823176.4A EP2976989A4 (en) | 2013-07-11 | 2014-07-07 | Light source device |
| US14/919,849 US10085611B2 (en) | 2013-07-11 | 2015-10-22 | Light source apparatus for driving light sources based on generated light adjustment information |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2976989A4 (en) | 2017-03-15 |
| JP5789348B2 (ja) | 2015-10-07 |
| EP2976989A1 (en) | 2016-01-27 |
| US20160037999A1 (en) | 2016-02-11 |
| JP2015231553A (ja) | 2015-12-24 |
| JP6138203B2 (ja) | 2017-05-31 |
| CN105451634A (zh) | 2016-03-30 |
| CN105451634B (zh) | 2018-12-07 |
| JPWO2015005277A1 (ja) | 2017-03-02 |
| US10085611B2 (en) | 2018-10-02 |
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