JP5420168B2 - Light source device and endoscope device - Google Patents

Description

  The present invention relates to a light source device and an endoscope device, and more particularly to a light source device having a wavelength changing unit using a wavelength changing filter and an endoscope device including the light source device.

  Endoscopes are widely used in the medical field and the like. The endoscope has a long and thin insertion portion. The endoscope can observe various organs and the like by inserting an insertion portion into the body and perform various treatments using a treatment tool inserted into a treatment tool insertion channel as necessary.

  In an endoscope apparatus equipped with such an endoscope, illumination light from a light source device is guided using a light guide or the like to illuminate a target portion of the subject, and the imaging unit captures the return light. An endoscopic image is obtained.

  The endoscopic device captures an endoscopic image by an imaging unit and processes the image signal with a signal processing device, thereby displaying the endoscopic image on a monitor so that the operator can observe the target site. ing. Then, the endoscope apparatus is provided with a light amount adjusting means for making the brightness of the endoscopic image displayed on the monitor constant so that the operator can easily recognize the endoscopic image displayed on the monitor. Have. That is, the light amount adjusting means of the light source device controls the light amount of the illumination light based on the endoscope image information captured by the imaging unit.

Further, in the endoscope apparatus having the wavelength changing unit disclosed in Japanese Patent Laid-Open No. 2000-253307, the light from a light source that generates light having a broadband wavelength component is used in the wavelength changing unit according to the observation mode. Only light of a desired wavelength is selected and used for illumination of the target site. In the wavelength changing unit, in order to generate illumination light corresponding to various observation modes, a filter conforming to the specification is selected from a plurality of filters for changing the wavelength.
JP 2000-253307 A

  However, in the light source device having the wavelength changing unit, when the wavelength changing unit selects the filter, that is, when the wavelength is changed, illumination light completely different from the target illumination light is temporarily generated. For example, illumination light may not be temporarily emitted at all due to the influence of a frame between the filters, or an unexpectedly strong light amount may be emitted depending on the combination of a plurality of filters. Even in such a case, the light amount adjusting unit controls the light amount in order to keep the brightness of the endoscopic image displayed on the monitor constant, but the responsiveness of the light amount adjusting unit cannot follow the change in the illumination light, On the contrary, the monitor image may be greatly disturbed.

  Here, FIG. 7 is a diagram comparing the change in the amount of illumination light when changing the wavelength, the change in the current of the lamp as the light source, and the change in luminance of the monitor, the horizontal axis is time, the vertical axis is the amount of illumination light, the aperture amount, Indicates current or brightness. FIG. 7A shows a change in the amount of illumination light when the light amount adjusting means does not adjust the illumination light amount when changing the wavelength. Then, based on the captured image information obtained by imaging the imaging target illuminated by the illumination light shown in FIG. 7A, the current change when the light amount adjusting unit performs the current control of the lamp (FIG. 7B). , And aperture change (FIG. 7C). FIG. 7D shows a change in luminance of the monitor when the control shown in FIG. 7B is performed.

  As shown in FIG. 7A, when the wavelength is changed from T1 to T3, that is, while the observation mode is switched, the amount of illumination light varies extremely, and the variation is difficult to predict. For this reason, when the light amount adjusting means controls the lamp light amount with the lamp current value, as shown in FIG. 7B, the lamp current value largely changes in accordance with the change in the illumination light amount. Become. However, for example, in the state where illumination light is not emitted at all due to the influence of the frame between the filters, the illumination light quantity does not increase even if the lamp current value is increased. It will increase. The response speed of the light amount adjusting means is finite.

  For this reason, as shown in FIG. 7D, the operation of the light amount adjusting means causes a violent change in the monitor luminance, and even if the wavelength changing operation ends at T3, the target luminance is maintained until T4 is reached. There are times when it must not. In other words, the operation of the light amount adjusting means may reduce the response of the observation mode switching operation. In addition, when the illumination light is not emitted at all in the state as described above, an excessive current is applied to the lamp, so that not only energy efficiency is bad, but also the sound of the fan for cooling the lamp is loud. Thus, the light source device has also become a source of noise.

  Further, when a xenon lamp is used as the light source, the current is turned off when the current is equal to or lower than the turn-off threshold, and it takes time to turn it on again when the light is turned off. For this reason, when the illumination light quantity greatly increases when the wavelength is changed (FIG. 7D: T2), if the light quantity adjustment means lowers the lamp current to the turn-off threshold or less, it takes time for the monitor brightness to recover. Is required. For example, when the lamp is turned off just before the end of the wavelength changing operation, the response of the observation mode switching operation may be extremely poor.

  As described above, the light source device having the wavelength changing unit that adjusts the light amount based on the captured image information and the endoscope device including the light source device have a slow response after the wavelength change, and the workability is not good. was there.

  It is an object of the present invention to provide a light source device having a good response for switching an observation mode and good workability, and an endoscope apparatus including the light source device.

The light source device of the present invention includes a light source of illumination light that illuminates an imaging target of an imaging unit, and a plurality of filters for changing wavelengths, and at least one filter selected from the plurality of filters is emitted from the light source. A wavelength changing unit that is arranged on the luminous flux to generate the illumination light, and a light amount control unit that controls a light amount of the illumination light with a control signal based on captured image information of the imaging unit, and the wavelength The changing unit selects the one filter according to the observation mode, and the light amount control unit stops the control of the light amount during the wavelength changing operation. In the endoscope apparatus of the present invention, the imaging unit is an imaging unit of an endoscope, and includes the light source device.

  The present invention provides a light source device having a good response to switching of observation modes and good workability, and an endoscope apparatus including the light source device.

<First Embodiment>
Hereinafter, an endoscope apparatus 1 according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing the overall configuration of the endoscope apparatus 1 according to the present embodiment, and FIG. 2 is a configuration diagram for explaining the configuration of the light source device 6. As shown in FIG. 1, the endoscope apparatus 1 includes an endoscope 2, a light source device 6, a video processor 4, and a monitor 5. The endoscope 2 includes an elongated insertion portion 3 that is inserted into a subject, and an operation portion 7 that is connected to the proximal end side of the insertion portion 3. The insertion portion 3 includes a bending portion 3A provided on the distal end side of the insertion portion 3 having flexibility, and a distal end portion 3B provided on the distal end side of the bending portion 3A. The distal end portion 3B incorporates a CCD 16 (see FIG. 2) that is an imaging unit for imaging the observation site 9 in the subject. Is displayed. On the other hand, the illumination light supplied from the light source device 6 is transmitted to the distal end side of the insertion portion 3 by the light guide 15 (see FIG. 2).

  That is, as shown in FIG. 2, light supplied from a xenon lamp (Xe lamp) 21 that is a light source of the light source device 6 is condensed as a light beam 10 by an optical system such as a lens 24, and desired by a wavelength changing unit 30. Only light of the wavelength is selected. In the light source device 6, the light amount adjustment is performed by the light amount control unit 27 in the light source control unit 22. The light quantity control unit 27 includes a xenon lamp control unit (Xe control unit) 28 that controls the current of the xenon lamp 21 that is a light source, and an aperture control unit 29 that controls the aperture amount of the aperture unit 20 disposed on the light beam. It is configured.

  The xenon lamp 21 is a lamp that uses a discharge in xenon (Xe) by enclosing high-pressure xenon in a tube. The xenon lamp 21 is not only a very high-intensity light source, but the generated lamp light is a continuous spectrum with a wide wavelength band component that is very similar to sunlight, and is also strong in ultraviolet rays. For this reason, the light source device using the xenon lamp 21 as a light source can generate illumination light corresponding to various observation modes by selecting only light having a desired wavelength by the wavelength changing unit 30. The light source device of the endoscope apparatus 1 is particularly preferable. Although the lamp light quantity of the xenon lamp 21 can be controlled by current, the lamp is turned off when the current falls below the turn-off threshold, and a high voltage needs to be applied at the time of turning on, and instantaneous relighting is impossible.

  The diaphragm unit 20 is, for example, a light amount adjusting unit that limits the area of the light beam passing through the diaphragm unit 20 by using diaphragm blades that rotate and move on a vertical plane around the rotation axis. A response is possible. The diaphragm 20 is controlled by controlling the motor (M) to which the diaphragm blades are attached. The diaphragm unit 20 may be disposed before the wavelength changing unit 30 or in the wavelength changing unit 30 instead of after the wavelength changing unit 30.

  The illumination light whose light amount has been adjusted by the diaphragm unit 20 is guided to the end 15 </ b> A of the light guide 15. The illumination light is transmitted to the other end portion 15B of the light guide 15, and illuminates the observation region 9 of the subject from an illumination optical system (not shown) disposed on the end surface of the end portion 15B.

  Here, if the brightness of the captured image displayed on the monitor 5, that is, the luminance is not constant due to the distance between the observation region 9 and the tip 3 </ b> B or the reflectance of the observation region 9, the surgeon can accurately determine the observation region 9. Recognition may be difficult. For this reason, the light quantity control unit 27 has a diaphragm unit that is a current that is a control signal of the xenon lamp 21 and / or a control signal of the diaphragm unit 20 so that the luminance signal from the video processor 4 is substantially the same as the reference luminance signal. The current applied to the 20 motors is controlled.

  The light amount control unit 27 controls the light amount of the illumination light based on the captured image information of the observation region 9 illuminated by the illumination light from the light source device 6 captured by the CCD 16 serving as the imaging unit.

  Next, the wavelength changing unit 30 will be described with reference to FIG. FIG. 3 is a perspective view for explaining the wavelength changing unit 30 of the light source device 6 of the present embodiment. In order to simplify the drawing, the optical system, the drive motor (M) and the like are not shown in FIG. The wavelength changing unit 30 generates illumination light having a wavelength corresponding to the observation mode from the lamp light of the xenon lamp 21 having a wide wavelength band component by using a wavelength changing filter.

  FIG. 3 shows a turret A (26A) in which six types of filters A1 to A6 are arranged on the circumference, and a turret B (26B) in which six types of filters B1 to B6 are arranged on the circumference. ), Filter unit A (25A) in which three types of filters α1 to α3 are disposed on the outer periphery, and filter unit B (25B) in which three types of filters β1 to β3 are disposed on the outer periphery. The wavelength change part 30 which consists of is shown. The turret A and the turret B have a structure that can be rotated independently by the motor (M), with the central axis of each turret as the center. On the other hand, the filter unit A and the filter unit B have a structure in which the entire filter unit can be independently moved back and forth by a motor (M). Normally, the filter unit itself is always rotated by a motor (not shown). It is in.

  In the wavelength changing unit 30 shown in FIG. 3, the filter A1 is used for the turret A (26A), the filter B1 is used for the turret B (26B), the filter α1 is used for the filter unit A (25A), and the filter is used for the filter unit B (25B). β1 indicates a state where each is arranged on the light beam 10. That is, the light of the xenon lamp 21 passes through the filter A1, the filter B1, the filter α1, and the filter β1, so that only light having a desired wavelength is selected from the lamp light and illumination light is generated. Yes.

  That is, the wavelength changing unit 30 includes a plurality of turrets each having a plurality of filters arranged on the circumference, and each of the plurality of turrets has one filter on the light beam 10 emitted from the light source. The illumination light is generated by arranging.

  Note that at least one filter may be disposed on the light beam 10. In the case of the wavelength changing unit 30 having a plurality of turrets, a filter disposing unit in which no filter is disposed, that is, a turret having a hole provided in the turret is used, and the luminous flux 10 is passed through the hole. That's fine. Alternatively, even if a turret having a filter that transparentizes all the lamp light from the light source is used, it is possible to obtain the same effect as when one filter is arranged on the light beam 10 in practice. That is, in the present embodiment, “the plurality of turrets each have one filter arranged on the light beam 10 emitted from the light source” means that only one filter is placed on the light beam 10 as described above. Including the case where it is arranged in.

  Here, the illumination light in the observation mode supplied by the light source device 6 includes, for example, normal observation light, infrared special observation light, narrow-band special observation light, fluorescence special observation light, and fluorescence / infrared normal observation light. It is. Further, for example, by arranging three color filters of RGB in the filter unit, a color endoscope image can be obtained by image processing even when the CCD 16 for black and white detection is used.

  As described above, the wavelength changing unit 30 includes a plurality of wavelength changing filters, and at least one filter selected from the plurality of filters is arranged on the light beam 10 emitted by the xenon lamp 21 to illuminate light. Is generated. Then, the wavelength changing unit 30 selects the filter according to the observation mode.

  In the light source device 6 according to the present embodiment, after the wavelength changing unit 30 selects a filter according to the observation mode, that is, after the wavelength changing operation, the luminance of the monitor 5 is immediately used as the reference luminance signal. In order to do so, the light quantity control unit 27 of the light source device 6 of the present embodiment performs the operation shown in FIG. FIG. 4 is a flowchart for explaining an operation flow of the light amount control unit 27 during the wavelength changing operation.

  Hereinafter, the operation flow of the light quantity control unit 27 during the wavelength changing operation will be described with reference to the flowchart of FIG.

<Step S11>
The light quantity control unit 27 determines the presence / absence of an input signal for switching the observation mode from the input unit 23 of the light source device 6 or the video processor 4. The light quantity control unit 27 performs the process from step S12 when there is an input signal for switching the observation mode (Yes), and performs the process from step S14 when there is no input signal (No). Do.

<Step S12>
The light amount control unit 27 stops the control of the illumination light amount and fixes the control signal to the first predetermined value when there is an input signal for the observation mode switching instruction (Yes). Here, the control signal is a current signal (hereinafter referred to as “lamp current”) applied to the xenon lamp 21 and / or a signal for moving the diaphragm applied to the motor of the diaphragm unit 20. In the light source device 6 of the present embodiment, the first predetermined value of the control signal to be fixed is the value immediately before the input signal for the observation mode switching instruction.

<Step S13>
Since the xenon lamp control unit 28 of the light amount control unit 27 outputs, for example, the lamp current immediately before the input signal of the observation mode switching instruction as a control signal to the xenon lamp 21, the xenon lamp 21 generates a lamp light amount. Does not change.

  In the following description of the operation of the light amount control unit 27, for the sake of simplicity, the operation of the xenon lamp control unit 28 will be described, and the aperture control unit 29 that controls the aperture amount of the aperture unit 20 stops the light amount control. The case where the control signal is fixed to the control signal immediately before the input signal for the observation mode switching instruction will be described.

  Here, the operation of the light amount control unit 27 when changing the wavelength of the light source device 6 of the present embodiment will be described with reference to FIG. FIG. 5 is a diagram comparing the change in the amount of illumination light, the change in the current of the xenon lamp 21, the change in the amount of aperture, and the change in luminance of the monitor 5 when the wavelength of the light source device 6 of the present embodiment is changed. Indicates time, and the vertical axis indicates the amount of illumination light, current, aperture amount, or luminance. FIG. 5A shows a change in the light amount of the illumination light when the light amount control unit 27 does not adjust the illumination light amount when changing the wavelength. FIG. 5B and FIG. 5C show current and aperture amount changes when the light amount control unit 27 performs current control of the xenon lamp 21 and control for fixing the control signal of the aperture unit 20 to a predetermined value. ing. FIG. 5D shows a change in luminance of the monitor 5 when the control shown in FIGS. 5B and 5C is performed.

  As shown in FIG. 5A, in the light source device 6, as in the case of FIG. 7A described above, the light amount control is performed when the wavelength is changed from T1 to T3, that is, during the observation mode switching. Otherwise, the illumination light quantity will fluctuate very violently.

  However, as shown by the line B1 in FIG. 5B, the light amount control unit 27 of the present embodiment stops the control of the illumination light amount when switching the observation mode, and the control signal, that is, the lamp current value is changed to the observation mode. The first predetermined value immediately before the input signal of the switching instruction is fixed. For this reason, as indicated by the C1 line in FIG. 5D, the luminance of the monitor 5 varies because the amount of illumination light changes in response to the change in the filter arrangement state of the wavelength changing unit 30.

  However, since the lamp current value is fixed to the first predetermined value, the light quantity control unit 27 can reach the target brightness immediately at T4 when the wavelength changing operation ends at T3. Further, the xenon lamp 21 is not turned off during the wavelength changing operation. For this reason, the light quantity control unit 27 has a good response to the observation mode switching operation. Further, since the light source device 6 does not apply excessive current to the xenon lamp 21 even when no illumination light is emitted, the light source device 6 not only consumes unnecessary energy but also a fan for cooling the xenon lamp 21. The noise of the light source device is not increased and the noise of the light source device can be reduced at the same time.

<Step S14>
When there is no input signal for the observation mode switching instruction (S11: No), the light amount control unit 27 controls the normal illumination light amount and outputs a control signal.

  That is, first, the light amount control unit 27 acquires a reference luminance signal from the input unit 23. The reference luminance signal is a target value for the brightness of the display screen displayed on the monitor 5. The reference luminance signal may be input by the operator using a dial or the like disposed on the input unit 23 or may be input from the video processor 4.

<Step S15>
The light quantity control unit 27 compares the luminance signal with the reference luminance signal and calculates the difference.

<Step S16>
The light quantity control unit 27 calculates a control signal corresponding to the difference between the luminance signal and the reference luminance signal, that is, the current value of the xenon lamp 21. When the difference between the luminance signal and the reference luminance signal is within a predetermined range, a control signal having the same value as the previous control signal is output. The predetermined range of the difference between the luminance signal and the reference luminance signal is a value determined when the operator or the light source device 6 is designed. If the range is too narrow, the current value of the xenon lamp 21 is always fine. Since the state changes, the brightness of the display screen may flicker due to the delay of the processing circuit or the like. On the other hand, if the range is too wide, the brightness of the display screen is not appropriate because the xenon lamp 21 does not change even when the amount of light should be changed.

<Step S13>
The lamp light amount of the xenon lamp 21 is changed by the control signal output by the light amount control unit 27 in step S13, and a captured image having a luminance that is easy for the operator to observe is displayed on the monitor 5.

<Step S17>
The light quantity control unit 27 repeats the operation from step S11 until an end instruction is input from the operator.

  As described above, the light source device 6 of the present embodiment has a good response to the observation mode switching operation. Further, the light source device 6 can not only consume useless energy, but can also realize noise reduction at the same time. In addition, the endoscope apparatus 1 including the light source device 6 of the present embodiment has a good response to the operation for switching the observation mode, and the operability is good. The endoscope apparatus 1 is excellent not only in energy saving but also in quietness.

<Second Embodiment>
Hereinafter, the light source device 6B according to the second embodiment of the present invention will be described. Since the basic configuration of the light source device of the present embodiment is almost the same as that of the light source device 6 of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. Only control by the light quantity control unit 27 will be described.

  In the light source device 6B, during the wavelength changing operation of the wavelength changing unit 30, the control of the xenon lamp control unit 28 is stopped, and the control signal, that is, the lamp current is turned off as shown by the line B2 in FIG. The current value is fixed to a first predetermined value that is a little higher than the current value. In the light source device 6B, in order to set the value of the lamp current value to be fixed to a current value slightly higher than the turn-off threshold value, for example, 110% of the turn-off threshold value, as shown by the C2 line in FIG. Since the brightness of 5 changes only at a low level, the substantial brightness fluctuation range of the monitor 5 can be reduced. And in addition to the effect which the light source device 6B of this Embodiment has in the light source device 6 of 1st Embodiment, in order to hold | maintain with a lower lamp electric current, the light source device 6B not only consumes more useless energy, More quiet. In addition to the effects of the endoscope apparatus 1 of the first embodiment, the endoscope apparatus 1B including the light source device 6B not only consumes more wasted energy, but also has higher silence.

<Third Embodiment>
The light source device 6C according to the third embodiment of the present invention will be described below. Since the basic configuration of the light source device 6C is almost the same as that of the light source device of the second embodiment, the same components are denoted by the same reference numerals and description thereof is omitted, and the light amount control unit 27 of the light source device 6C is used. Only control will be described.

  In the light source device 6C of the present embodiment, the xenon lamp control unit 28 stops the control while the wavelength changing unit 30 performs the wavelength changing operation, and the lamp current value is set as indicated by line B3 in FIG. At the same time that the current value is slightly higher than the turn-off threshold, for example, a first predetermined value that is 110% of the turn-off threshold, the diaphragm controller 29 stops the light amount control by the diaphragm 20 and the control signal is in a half-open state. Is fixed to a predetermined value.

  For this reason, in the light source device 6C, as indicated by the line C3 in FIG. 6D, the luminance of the monitor 5 is stable even during the wavelength changing operation.

  In addition to the effects of the light source device 6B and the endoscope device 1B of the second embodiment, the light source device 6C and the endoscope device 1C having the light source device of the present embodiment have a monitor 5 during observation mode switching. The change in brightness is small.

  Note that the predetermined value of the control signal for fixing the diaphragm may be another predetermined value such as a fully closed state instead of the half-open state. In addition, when the light quantity control unit 27 includes a plurality of light quantity control units that control the light quantity, the light quantity control unit 27 stops control of at least one light quantity control unit while the wavelength changing unit 30 is performing the wavelength changing operation. What is necessary is just to be sufficient, and it is not limited to the example demonstrated by the light source devices 6-6C of said 1st to 4th embodiment. For example, while the wavelength changing unit 30 is in the wavelength changing operation, the xenon lamp control unit 28 stops the control of the xenon lamp control unit 28, but the aperture control unit 29 is a light source device that controls the aperture unit 20. Good.

<Fourth embodiment>
Next, a light source device 6D according to a fourth embodiment of the present invention will be described. Since the basic configuration of the light source device 6D is substantially the same as that of the light source device 6 of the first embodiment, hereinafter, the same components are denoted by the same reference numerals and description thereof will be omitted. Only the control according to will be described.

  In the light source device 6D of the present embodiment, when the selected filter is not disposed on the light beam 10 even after a predetermined time has elapsed during the wavelength changing operation, the light amount control unit 27 sends a control signal to the predetermined signal. Hold on value. As already described, the wavelength changing unit 30 generates illumination light in a desired observation mode by moving a necessary filter with a motor and arranging it on the light beam 10. However, in rare cases, the operation of the wavelength changing unit 30 may cause an error. Furthermore, although extremely rare, the possibility that the wavelength changing unit 30 stops in a combined state of filters that generate a very strong illumination light amount as indicated by A1 in FIG. 5A is not zero.

  In the light source device 6D, when the selected filter is not disposed on the light beam 10 even after a predetermined time has elapsed during the wavelength changing operation, the light amount control unit 27 sets the control signal to a second predetermined value set in advance. By holding in this position, it is possible to prevent damage due to the observation site 9 of the subject receiving a very strong illumination light for a long time. Here, as the second predetermined value of the control signal to be held, when the lamp light amount is controlled, the lamp current value is preferably a current value slightly higher than the turn-off threshold, for example, 110% of the turn-off threshold. In the case of controlling the signal, a signal with the aperture fully closed is preferable. This is to more reliably prevent the observation site 9 from being damaged. The second predetermined value is a value that provides an illumination light amount equal to or less than the first predetermined value described above, for example, a low current in the case of lamp current control, and a signal that closes the aperture in the case of aperture control. It is.

  The preset predetermined time may be any time that exceeds the observation mode switching time that requires the longest time among various observation mode switching times, and preferably the observation that requires the longest time. More than 110% of the mode switching time. The upper limit of the predetermined time is 200% or less of the observation mode switching time that requires the longest time. Within the above range, damage to the observation site 9 can be reliably prevented without malfunction.

  In order to determine that the operation of the wavelength changing unit 30 has caused an error, the light source device 6D uses a timer for determining whether or not a predetermined time is exceeded. , And detects whether the correct filter switching is performed according to the mode switching instruction. When the selected filter is not placed on the light beam 10 within a predetermined time, the light amount control unit 27 outputs a control signal. You may make it hold | maintain to a predetermined value.

  In addition to the effects of the light source device 6 and the endoscope device 1 according to the first embodiment, the wavelength changing unit 30 includes the light source device 6D according to the present embodiment and the endoscope device 1D including the light source device 6D. Even if an error occurs, the observation site 9 of the subject is not damaged, wasteful energy is not consumed, and silence is high.

  The present invention is not limited to the above-described embodiments and modifications, and various changes and modifications can be made without departing from the scope of the present invention.

1 is a configuration diagram illustrating an overall configuration of an endoscope apparatus according to a first embodiment. FIG. It is a block diagram for demonstrating the structure of the light source device concerning 1st Embodiment. It is a perspective view for demonstrating the wavelength change part of the light source device concerning 1st Embodiment. It is a flowchart for demonstrating the flow of operation | movement of the light quantity control part in the wavelength change operation | movement of the light source device concerning 1st Embodiment. It is the figure which compared the light quantity change of the illumination light at the time of the wavelength change of the light source device concerning 1st Embodiment and 2nd Embodiment, the electric current change of the lamp | ramp which is a light source, and the brightness | luminance change of a monitor, A horizontal axis is Time is shown on the vertical axis, and the light quantity, current, or luminance is shown. It is the figure which compared the light quantity change of the illumination light at the time of the wavelength change of the light source device concerning 3rd Embodiment, the electric current change of the lamp | ramp which is a light source, and the brightness | luminance change of a monitor, A horizontal axis is time and a vertical axis | shaft is light quantity. , Current or brightness. It is the figure which compared the light quantity change of the illumination light at the time of wavelength change of the conventional light source device, the current change of the lamp which is a light source, and the brightness change of the monitor, the horizontal axis shows time, the vertical axis shows the light quantity, current or brightness. ing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Endoscope apparatus, 2 ... Endoscope, 3 ... Insertion part, 3A ... Bending part, 3B ... Tip part, 4 ... Video processor, 5 ... Monitor, 6 ... Light source device, 7 ... Operation part, 9 ... Observation Part: 10: Light flux, 15: Light guide, 15A: End part, 15B: End part, 20: Aperture part, 21: Xenon lamp, 22: Light source control part, 23: Input part, 24: Lens, 25A, 25B ... Filter unit, 26A, 26B ... Turret, 27 ... Light quantity control unit, 28 ... Xenon lamp control unit, 29 ... Aperture control unit 29, 30 ... Wavelength changing unit, A1-A6, B1-B6 ... Filter, α1-α3 ... Filter , Β1 to β3 ... Filter

Claims (8)

A light source;
A plurality of wavelength changing filters is provided, and at least one filter selected from the plurality of filters is arranged on a light beam emitted from the light source to generate illumination light for illuminating an imaging target of the imaging unit A wavelength changing unit;
A light amount control unit that controls a light amount of the illumination light by a control signal based on captured image information of the imaging unit;
The wavelength changing unit selects the one filter according to an observation mode, and the light amount control unit stops the control of the light amount of the illumination light during the wavelength changing operation. .   2. The light source device according to claim 1, wherein the light quantity control unit holds the control signal at a first predetermined value while the wavelength changing unit is performing a wavelength changing operation. The light quantity control unit has a plurality of light quantity control means for controlling the light quantity of the illumination light,
3. The light source device according to claim 1, wherein the light amount control unit stops control of at least one of the light amount control units while the wavelength changing unit is performing a wavelength changing operation. The wavelength changing unit has a plurality of turrets in which the plurality of filters are arranged on a circumference,
4. The light source device according to claim 1, wherein each of the plurality of turrets has a filter disposed on a light beam emitted from the light source. 5. The light amount control unit holds the control signal at a second predetermined value when the selected filter is not disposed on the light flux even after a predetermined time has elapsed during the wavelength changing operation. The light source device according to claim 1, wherein the light source device is a light source device. The light source device according to claim 3, wherein the light amount control unit includes a light source control unit that controls the light source and a diaphragm unit control unit that controls a diaphragm unit disposed on the light beam. The light source device according to any one of claims 1 to 6, wherein said light source is a xenon lamp.   An endoscope apparatus comprising the light source device according to any one of claims 1 to 7, wherein the imaging unit is an imaging unit of an endoscope.

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