WO2016056477A1 - 光源装置 - Google Patents
光源装置 Download PDFInfo
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- WO2016056477A1 WO2016056477A1 PCT/JP2015/078021 JP2015078021W WO2016056477A1 WO 2016056477 A1 WO2016056477 A1 WO 2016056477A1 JP 2015078021 W JP2015078021 W JP 2015078021W WO 2016056477 A1 WO2016056477 A1 WO 2016056477A1
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- light
- leds
- light emitting
- emitting elements
- semiconductor light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
-
- 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
- A61B1/00043—Operational features of endoscopes provided with output arrangements
- A61B1/00045—Display arrangement
-
- 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
- A61B1/05—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 characterised by the image sensor, e.g. camera, being in the distal end portion
- A61B1/051—Details of CCD assembly
-
- 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
- A61B1/0676—Endoscope light sources at distal tip 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]
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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
- 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
- G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/22—Controlling the colour of the light using optical feedback
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
-
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/555—Constructional details for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
Definitions
- the present invention relates to a light source device suitable for an endoscope.
- a light source device is employed to perform imaging inside a body cavity.
- a light source device employing a semiconductor light source such as an LED as a light emitting unit may be used.
- Japanese Patent Application Laid-Open No. 11-313797 discloses a light source device including a plurality of light emitting elements.
- the light source device includes a light detection unit that detects a light amount of illumination light from an illumination unit including a plurality of light emitting elements, and compares the light amount detected by the light detection unit with a predetermined light amount. When the detected light amount is smaller than the predetermined light amount, the replacement of the light emitting element is displayed.
- the conventional light source device can detect the lifetime of the light emitting element from the detection result of the light detection unit.
- a light source device that includes a plurality of light detection units that detect the respective light amounts of a plurality of light emitting elements and adjusts color balance based on the light amounts detected by the plurality of light detection units is used. .
- the abnormality of the light emitting element can be detected, the abnormality of the light detection unit cannot be detected. If the light detection unit has an abnormality, the light detection unit having the abnormality is detected. There is a problem in that the color balance is adjusted based on the amount of light detected in step (b).
- an object of the present invention is to provide a light source device that can easily detect an abnormality of a light detection unit or a light emitting element.
- a light source device includes a plurality of semiconductor light emitting elements that respectively emit illumination lights of different colors for illuminating a subject, and a light emitting element driving unit that generates a driving current for the plurality of semiconductor light emitting elements.
- a plurality of light detectors for detecting the illuminance values of the illumination lights of the respective colors of the plurality of semiconductor light emitting elements, and a table of illuminance values in a predetermined range corresponding to a drive current when the plurality of semiconductor light emitting elements emits light normally.
- the storage unit that stores the data and the table of the storage unit, and the illuminance value of any of the plurality of semiconductor light emitting elements detected by any of the plurality of light detection units corresponds to the drive current.
- any one of the plurality of semiconductor light emitting elements is determined not to be an illuminance value within the predetermined range, any of the plurality of light detection units. The Having an abnormality detection unit for detecting as any abnormal atmospheric or said plurality of semiconductor light-emitting element.
- An example of two LEDs 81 and 85 arranged in close proximity is shown.
- An example of two LEDs 81 and 85 arranged in close proximity is shown.
- FIG. 1 is a block diagram showing an endoscope system having a light source device according to the first embodiment.
- 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 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 LED
- the LEDs 42 to 45 constituting the plurality of semiconductor light emitting elements each emit illumination light of different colors for illuminating the subject.
- the types of colors and the number of colors are not limited to 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. Dichroic filters 47 to 49 are arranged on the optical axis of the lens 42 a that emits light from the R-LED 42. 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 driving unit 46 constituting the light emitting element driving unit is controlled by the control unit 41 to generate PWM pulses that are driving signals for driving the LEDs 42 to 45.
- 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. .
- optical sensors 42b to 45b are arranged at positions where the emitted light of the LEDs 42 to 45 can be detected.
- Each of the light sensors 42b to 45b constituting the plurality of light detection units detects the illuminance value of the illumination light of each color of each of the LEDs 42 to 45, and outputs the detection result 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 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 control unit 41 Based on the brightness control information from the video processor 20, the control unit 41 maintains each light emitting amount ratio (light amount ratio) of each LED 42 to 45 so as to obtain an optimum color balance. Control the amount of light. 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 from the video processor 20, and for the other LEDs 42, 44, 45, the G-LED 43 The dimming information is obtained so as to obtain a predetermined light amount ratio according to the light amount value.
- control unit 41 controls the light amount value of the G-LED 43 based on the brightness control information from the video processor 20. Then, the control unit 41 determines a predetermined color for the other LEDs 42, 44, and 45 based on the detection result of the optical sensor 43b of the G-LED 43 and the detection result of the optical sensor 42b, 44b, or 45b of its own color.
- the light quantity value is controlled so as to be balanced (so that the light quantity ratio with G becomes the target ratio).
- control unit 41 compares the illuminance values of the respective LEDs 42 to 45 detected by the optical sensors 42b to 45b with information stored in the memory 41a.
- the memory 41a constituting the storage unit stores the illuminance values in a predetermined range of the LEDs 42 to 45 corresponding to the drive currents during normal light emission of the LEDs 42 to 45 as a table.
- the control unit 41 determines whether or not the detected illuminance value is within a predetermined illuminance value range from the relationship between the drive current and the illuminance value stored in the memory 41a. When the control unit 41 determines that the detected illuminance value is within the range of the predetermined illuminance value, it determines that the LEDs 42 to 45 and the optical sensors 42b to 45b are normal, and the detected illuminance value is the predetermined illuminance value. When it is determined that it is not within the range of the illuminance value, it is determined that one of the LEDs 42 to 45 or the optical sensors 42b to 45b is abnormal.
- FIGS. 2A and 2B are diagrams for explaining an example of information stored in the memory 41a.
- 2A is a table for explaining an example of information stored in the memory 41a
- FIG. 2B is a graph for explaining an example of information stored in the memory 41a.
- the table 41b is associated with the relationship between the drive currents of the LEDs 42 to 45, the minimum illuminance, and the maximum illuminance.
- a table for each LED 42 to 45 may be stored in the memory 41a.
- the minimum illuminance value and the maximum illuminance value with respect to the drive current may be acquired in advance at the time of factory shipment or the like and stored in the memory 41a.
- the control unit 41 refers to the table 41b, and when the LEDs 42 to 45 are driven with a drive current of 3 [A], the illuminance detected by the optical sensors 42b to 45b is C1 [lx ] To the maximum illuminance C2 [lx], it is determined that the LEDs 42 to 45 and the optical sensors 42b to 45b are normal.
- the illuminance detected by the optical sensors 42b to 45b is the minimum illuminance C1 [lx] to the maximum illuminance C2 [lx] when the control unit 41 drives the LEDs 42 to 45 with a drive current of 3 [A]. ], It is determined that the LEDs 42 to 45 or the optical sensors 42b to 45b are abnormal.
- the memory 41a may store information of the graph 41c shown in FIG. 2B instead of the table 41b of FIG. 2A.
- the control unit 41 constituting the abnormality detection unit refers to the table 41b (or the graph 41c) stored in the memory 41a, and the illuminance values detected by the optical sensors 42b to 45b are within a predetermined illuminance value range. If it is determined whether the detected illuminance value is not within the range of the predetermined illuminance value, an abnormality in any of the LEDs 42 to 45 or the optical sensors 42b to 45b is detected.
- the control unit 41 stops driving the LED determined to be abnormal, and the current value of the LED determined to be normal And secure the minimum possible amount of light emission.
- the control unit 41 determines that the illuminance value is larger than the predetermined illuminance value, for example, among the LEDs 42 to 45, the control unit 41 stops driving the LED determined to be abnormal, and the current value of the LED determined to be normal is It may be fixed, but when the LED drive unit 46 breaks down, it may be possible that the LEDs 42 to 45 cannot be controlled.
- the control unit 41 determines that the illuminance value detected by the optical sensors 42b to 45b is larger than the predetermined illuminance value, the control unit 41 uses a light amount adjustment mesh member 51 for adjusting the light amount to a safe range. 50 and the light guide 15 may be inserted. The mesh member 51 can be inserted and removed between the lens 50 and the light guide 15 under the control of the control unit 41.
- the member inserted when the amount of light is large is not limited to the mesh member 51, and for example, an NBI filter used in narrowband observation may be inserted.
- an NBI filter used in narrowband observation, it is not necessary to newly provide a mesh member 51 for light amount adjustment.
- the light source device 40 includes the optical sensors 42b to 45b that detect the illuminance of the LEDs 42 to 45, and the illuminance values of the LEDs 42 to 45 detected by the optical sensors 42b to 45b are stored in the memory 41a. Compared with the illuminance value of 41b, any abnormality of the optical sensors 42b to 45b or the LEDs 42 to 45 is detected.
- the light source device of the present embodiment it is possible to easily detect abnormality of the light detection unit or the light emitting element.
- FIG. 3 is a block diagram showing a configuration of an endoscope system having a light source device according to a modification of the first embodiment.
- the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
- the amount of light emitted from the LEDs arranged in the light source device is large, and there are also LEDs that emit light exceeding the light receiving limit of a general light sensor, so that the light amount of the LED can be accurately detected by the light sensor. There are things that cannot be done.
- the light source device 40a is configured by disposing the neutral density filters 42c to 45c on the light incident surfaces of the optical sensors 42b to 45b, respectively.
- a light detection unit is configured by each of the optical sensors 42b to 45b and the neutral density filters 42c to 45c.
- the neutral density filters 42c to 45c reduce the amount of light emitted from the LEDs 42 to 45 and incident on the optical sensors 42b to 45b, for example, to 1/10 or 1/100 depending on the filter characteristics. For this reason, when there are abnormalities such as dropout filters 42c to 45c being dropped, broken, or unable to be dimmed, the amount of light incident on the optical sensors 42b to 45b becomes much larger than the predetermined amount of light.
- the control unit 41 can detect an abnormality of the neutral density filters 42c to 45c, that is, an abnormality of the optical detection unit.
- the control unit 41 detects an abnormality in the neutral density filters 42c to 45c, since the LEDs 42 to 45 are normal, the drive currents of the LEDs 42 to 45 are fixed to drive current values that are substantially white illumination light, respectively. Then, the LED drive unit 46 is controlled so as to perform automatic dimming only by PWM control, and the minimum brightness necessary for observation is ensured.
- the control unit 41 detects that the LEDs 42 to 45 are abnormal.
- the control unit 41 stops driving the LED that has detected the abnormality and fixes the LED driving current to the LEDs other than the LED that has detected the abnormality.
- the unit 46 is controlled to ensure the minimum brightness necessary for observation.
- a light source device that can determine whether an LED (or LED drive unit) has failed and an optical sensor has failed, and can perform error processing according to the failure state will be described.
- FIG. 4 is a block diagram showing a configuration of an endoscope system having the light source device according to the second embodiment.
- the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
- the light source device 40b is configured by adding temperature sensors 42d to 45d for detecting the temperatures of the LEDs 42 to 45 to the light source device 40 of FIG.
- the temperature sensors 42d to 45d are arranged adjacent to the LEDs 42 to 45, detect the temperatures of the LEDs 42 to 45, and output the detection results to the control unit 41.
- the temperature sensors 42d to 45d are described as detecting the temperatures of the LEDs 42 to 45, respectively. However, for example, the temperature sensors 42d to 45d may detect the substrate temperature of the substrate on which the LEDs 42 to 45 are mounted.
- the memory 41a of the control unit 41 stores information indicating the relationship between the drive current and the LED temperature shown in FIGS. 5A and 5B in addition to the information shown in FIGS. 2A and 2B.
- FIG. 5A and 5B are diagrams for explaining an example of information stored in the memory 41a.
- FIG. 5A is a table for explaining an example of information stored in the memory 41a
- FIG. 5B is a graph for explaining an example of information stored in the memory 41a.
- the table 41d is associated with the relationship between the drive currents of the LEDs 42 to 45, the minimum temperature, and the maximum temperature.
- a table for each LED 42 to 45 may be stored in the memory 41a.
- the memory 41a may store information of the graph 41e shown in FIG. 5B instead of the table 41d of FIG. 5A.
- the control unit 41 determines whether or not the illuminance of the LEDs 42 to 45 is within a predetermined illuminance range from the detection results of the optical sensors 42b to 45b. When the illuminance of the LEDs 42 to 45 is within a predetermined illuminance range, the control unit 41 determines that the LEDs 42 to 45, the optical sensors 42b to 45b, and the LED driving unit 46 are normal. On the other hand, when the illuminance of the LEDs 42 to 45 is not within the predetermined illuminance range, the control unit 41 determines that the LEDs 42 to 45, the optical sensors 42b to 45b, or the LED driving unit 46 are abnormal.
- control unit 41 determines that the detection results of the optical sensors 42b to 45b are abnormal, the control unit 41 performs error determination based on the detection results of the temperature sensors 42d to 45d.
- the control unit 41 determines whether or not the detection results of the temperature sensors 42d to 45d are within a predetermined temperature range.
- the control unit 41 When the detection results of the temperature sensors 42d to 45d are within a predetermined temperature range, the control unit 41 does not normally obtain the light amount detection result although the LEDs 42 to 45 are normally lit. It is determined that the optical sensors 42b to 45b are out of order. If the control unit 41 determines that the optical sensors 42b to 45b have failed, the LEDs 42 to 45 themselves have no failure, so that the driving current of all the LEDs 42 to 45 is set to a fixed value to secure the field of view of the endoscope. The control unit 41 sets a predicted current value that is predicted to be substantially white illumination light to each of the LEDs 42 to 45 when the driving currents of all the LEDs 42 to 45 are fixed values.
- control unit 41 may set only the drive current of the LED paired with the photosensor determined to be a failure as a fixed value.
- control unit 41 enables automatic dimming by PWM control using the same pulse width for the LEDs 42 to 45 even when the drive current is set to a fixed value in the above two patterns. Since the same pulse width is used for all the LEDs 42 to 45, it is possible to perform dimming while maintaining the color state when the current is fixed.
- the control unit 41 assumes that the LEDs 42 to 45 are not correctly turned on in response to the lighting instruction from the LED drive unit 46. It is determined that the LEDs 42 to 45 are faulty. Alternatively, the control unit 41 determines that the LED drive unit 46 is faulty, assuming that the LEDs 42 to 45 are normal but the lighting instruction from the LED drive unit 46 is not normally performed on the LEDs 42 to 45.
- LEDs 42 to 45 fail to open, current does not flow to LEDs 42 to 45, indicating a temperature lower than the minimum temperature.
- LEDs 42 to 45 have a short circuit failure, overcurrent flows to LEDs 42 to 45, so the maximum temperature Indicates higher temperature.
- the control unit 41 determines whether or not the light amounts of the LEDs 42 to 45 are larger than a predetermined light amount. When it is determined that the light amount of the LEDs 42 to 45 is equal to or less than the predetermined light amount, the control unit 41 stops driving the LED determined to be out of the LEDs 42 to 45. On the other hand, when the control unit 41 determines that the light amounts of the LEDs 42 to 45 are larger than the predetermined light amount, the light amount adjusting mesh member 51 (or NBI filter) is placed in the optical path between the lens 50 and the light guide 15. insert.
- FIG. 6 is a flowchart for explaining an example of the flow of error processing of the light source device 40b.
- the control unit 41 determines whether or not the light amounts of the LEDs 42 to 45 are within a predetermined light amount range based on the detection results of the optical sensors 42b to 45b (step S1). When the control unit 41 determines that the light amounts of the LEDs 42 to 45 are within the predetermined light amount range, the control unit 41 determines YES, and determines that the LEDs 42 to 45, the optical sensors 42b to 45b, and the LED drive unit 46 are normal (step S2), the process is terminated.
- control unit 41 determines that the light quantity of the LEDs 42 to 45 is not within the predetermined light quantity range, it becomes NO, and the temperature of the LEDs 42 to 45 is the predetermined temperature based on the detection result of the temperature sensors 42d to 45d. It is determined whether it is within the range (step S3). When it is determined that the temperature of the LEDs 42 to 45 is within the predetermined temperature range, the control unit 41 determines YES and determines that the optical sensors 42b to 45b have failed (step S4). Then, the control unit 41 controls the LED drive unit 46, fixes the drive currents of all the LEDs 42 to 45 (step S5), and ends the process.
- the control unit 41 determines NO and determines that the LED 42 to 45 or the LED driving unit 46 has failed (step S6). Next, the control unit 41 determines whether or not the light amounts of the LEDs 42 to 45 are larger than a predetermined light amount (step S7).
- Step S8 the process ends.
- the control unit 41 determines that the amount of light of the LEDs 42 to 45 is greater than the predetermined amount of light, the control unit 41 determines YES, stops driving the LED determined to be faulty, fixes the current value of the LED other than the fault, and 51 is inserted into the optical path of the illumination light (step S9), and the process is terminated.
- the light source device 40b of the present embodiment monitors the temperature states of the LEDs 42 to 45 by the temperature sensors 42d to 45d when the light amount detection results of the LEDs 42 to 45 by the light sensors 42b to 45b indicate a light amount abnormality.
- the failure of the LEDs 42 to 45 and the failure of the light sensors 42b to 45b (or the LED drive unit 46) can be discriminated, and the optimum error processing according to the failure state can be performed.
- the failure of the LED (or LED drive unit) and the failure of the optical sensor are determined, and the failure state is determined. Optimal error handling can be performed.
- a general light source device is provided with a temperature sensor adjacent to each LED for feedback of cooling control. Therefore, it is not necessary to provide a new temperature sensor in the light source device of the present embodiment by replacing the detection result of the temperature sensor for cooling control feedback with the detection result for failure detection of the present embodiment. .
- the light source device for endoscopes is required to be downsized, and it is conceivable that the LEDs and the optical sensors are arranged close to each other.
- 7A and 7B show an example of two LEDs 81 and 85 arranged in close proximity.
- Lenses 82 and 86 are disposed on the optical axes of the LEDs 81 and 85, respectively.
- the lenses 82 and 86 convert the emitted light from the LEDs 81 and 85 into substantially parallel light, respectively.
- An optical sensor 84 for detecting the light quantity of each LED 81 and 85 is provided in the range 83 and 87 of each emitted light of each LED 81 and 85.
- 7A and 7B show only the optical sensor 84 that detects the amount of light 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 LEDs 81 and may adversely affect the color balance of the LEDs 81 and 85.
- FIG. 7B shows an example in which a light shielding wall 88 is disposed between the LED 81 and the LED 85 in order to suppress detection of leakage light (disturbance light) from adjacent LEDs.
- the light from the LED 85 enters the optical sensor 84 through the gap between the light shielding walls 88.
- FIGS. 8A, 8B, and 8C are diagrams illustrating a configuration example of a light detection unit that can reduce the ratio of disturbance light to light to be detected.
- the light detection unit 90 a is provided with a substantially cylindrical light guide member 91 so as to surround the optical sensor 84.
- the light guide member 91 is configured by a substantially circular incident portion 92 and a substantially cylindrical light guide portion 93.
- the incident part 92 is arranged to face the direction of the LED 81 to be detected.
- the light guide part 93 has a predetermined length so that the incident part 92 is located at a position where the direct light of the adjacent LED 85 that becomes disturbance light does not enter.
- the direct light from the LED 85 that is not desired to be detected can be shielded, and the light from the LED 81 that is desired to be detected can be mainly incident on the optical sensor 84.
- the light detection unit 90a can reduce the intensity ratio of disturbance light to the light from the LED 81 to be detected. Therefore, according to the light source device having such a light detection unit 90a, it is possible to ensure the color balance of the LEDs 81 and 85 (the emission ratio of the LEDs of each color) and to provide an optimal endoscopic image. .
- optical fiber 94 including a substantially circular incident portion 95 and a substantially cylindrical light guide portion 96, instead of the light guide member 91 of FIG. 8A. ing. And the incident part 95 provided in the front-end
- the incident portion 95 by arranging the incident portion 95 toward the LED 81 that is desired to be detected, even if light from the LED 85 that is not desired to be detected is incident on the incident portion 95, the light from the LED 85 is greater than or equal to the total reflection critical angle.
- the light enters the incident portion 95 at an angle.
- the light from the LED 85 escapes from the exterior of the optical fiber 94, is not guided to the optical sensor 84, and only the light from the LED 81 incident on the incident portion 95 at an angle smaller than the total reflection critical angle is light.
- the light is guided to the sensor 84.
- the light detection unit 90b can mainly make the light of the LED 81 to be detected incident on the optical sensor 84, similarly to the light detection unit 90a of FIG. 8A. Therefore, the light source device having such a light detection unit 90b can also ensure the color balance of the LEDs 81 and 85, and can provide an optimal endoscopic image.
- the light guide member 91 a has substantially the same configuration as the light guide member 91, and includes a substantially circular incident portion 92 and a substantially cylindrical light guide portion 93.
- the inner surface of the light guide 93 serves as a light absorption surface 97.
- the light detection unit 90c can mainly make the light of the LED 81 to be detected incident on the optical sensor 84, similarly to the light detection unit 90a of FIG. 8A. Therefore, the light source device having such a light detection unit 90c can also ensure the color balance of the LEDs 81 and 85, and can provide an optimal endoscopic image.
- each step in the flowchart in the present specification may be executed in a different order for each execution by changing the execution order and performing a plurality of steps at the same time as long as it does not contradict its nature.
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Abstract
Description
図1は、第1の実施形態に係る光源装置を有する内視鏡システムを示すブロック図である。本実施形態は、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。
次に、第1の実施形態の変形例について説明する。
次に、第2の実施形態について説明する。
Claims (4)
- 被写体を照明するための異なる色の照明光をそれぞれが出射する複数の半導体発光素子と、
前記複数の半導体発光素子の駆動電流を生成する発光素子駆動部と、
前記複数の半導体発光素子の各色の照明光の照度値をそれぞれ検知する複数の光検知部と、
前記複数の半導体発光素子が正常発光時の駆動電流に対応する所定の範囲の照度値をテーブルとして記憶する記憶部と、
前記記憶部の前記テーブルを参照し、前記複数の光検知部のいずれかで検知した前記複数の半導体発光素子のいずれかの照度値が、前記駆動電流に対応する前記所定の範囲内の照度値か否かを判定し、前記複数の半導体発光素子のいずれかの照度値が、前記所定の範囲内の照度値でないと判定した場合、前記複数の光検知部のいずれかの異常または前記複数の半導体発光素子のいずれかの異常として検知する異常検知部と、
を有することを特徴とする光源装置。 - 前記複数の半導体発光素子の温度をそれぞれ検知する複数の温度検知部を更に有し、
前記記憶部は、前記複数の半導体発光素子が正常発光時の駆動電流に対応する所定の範囲の温度値をテーブルとして記憶し、
前記異常検知部は、前記複数の半導体発光素子のいずれかの照度値が、前記所定の範囲内の照度値でないと判定した場合、前記複数の半導体発光素子のいずれかの温度値が前記所定の範囲内の温度値か否かを判定し、判定結果に基づいて、前記複数の半導体発光素子のいずれかまたは前記複数の光検知部の異常を検知することを特徴とする請求項1に記載の光源装置。 - 前記異常検知部は、前記複数の光検知部の少なくとも1つの光検知部の異常を検知した場合、前記複数の半導体発光素子の全ての駆動電流が固定値となるように前記発光素子駆動部を制御し、前記複数の半導体発光素子の少なくとも1つの半導体発光素子の異常を検知した場合、前記複数の半導体発光素子の内、異常を検知した半導体発光素子の駆動を停止するように、前記発光素子駆動部を制御することを特徴とする請求項1に記載の光源装置。
- 前記複数の光検知部は、それぞれが前記複数の半導体発光素子の各色の照明光を減光する減光フィルタと、前記減光フィルタにより減光された前記各色の照明光の照度値を検知する光センサとにより構成されることを特徴とする請求項1に記載の光源装置。
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CN201580047070.5A CN106793931A (zh) | 2014-10-10 | 2015-10-02 | 光源装置 |
JP2016524611A JP6062110B2 (ja) | 2014-10-10 | 2015-10-02 | 光源装置 |
EP15848912.0A EP3178372A4 (en) | 2014-10-10 | 2015-10-02 | Light source device |
US15/478,328 US10524646B2 (en) | 2014-10-10 | 2017-04-04 | Light source apparatus |
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EP (1) | EP3178372A4 (ja) |
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JP6617728B2 (ja) * | 2017-02-03 | 2019-12-11 | 京セラドキュメントソリューションズ株式会社 | 原稿読取装置 |
CN111629649B (zh) * | 2018-03-12 | 2024-07-30 | 奥林巴斯株式会社 | 内窥镜和内窥镜系统 |
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CN112203574B (zh) * | 2018-06-27 | 2024-09-24 | 奥林巴斯株式会社 | 内窥镜系统、内窥镜用光源装置和内窥镜 |
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