JP4308203B2 - Light source device - Google Patents

Description

  The present invention relates to a light source device that supplies illumination light for performing observation with special light such as fluorescence and infrared light in addition to observation with white light.

  In recent years, endoscopes have been widely used in the medical field. In an endoscope used in the medical field, not only can an organ in a body cavity be observed, but a treatment tool can be guided into a body cavity via a treatment tool channel provided in an insertion portion to perform various treatments.

  When performing inspection, treatment, etc. using an endoscope, a light source device that supplies illumination light as a peripheral device, a control device such as a camera control unit, a display device that displays an endoscopic image of a site to be inspected, etc. are used. The

  As a light source device used in an endoscope, for example, Japanese Patent Application Laid-Open No. 2001-343595 discloses a light source device that detects an abnormal rotation of a turret and presents an operating state to an operator.

  In this light source device, the turret is provided with a normal filter, an optional filter, and an emergency light. A toggle switch is provided for detecting the position of the turret. Then, it is detected whether or not the rotation of the turret is normal when the light source device is turned on. If it is normal, the turret is stopped at the initial position. Thereafter, the rotation position of the turret is obtained by obtaining the rotation angle from the initial position based on the pulse count value output from the motor driver under the control of the microcomputer.

In recent years, in addition to observation with normal light, observation using fluorescence, infrared light, narrowband light, or the like as illumination light is performed during endoscopic observation. That is, in the light source device of Patent Document 1, two filters are provided on the turret, whereas in recent light source devices, three or more types of filters are provided on the turret.
JP 2001-343595 A

  However, as the number of filters provided in the turret increases, the allowable filter area per filter decreases. In addition, since a single light source device can perform observation by irradiating a plurality of types of illumination light, the filter may be frequently switched during a single case. And when performing operation which switches a filter frequently, it is important to be able to exchange a filter quickly.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a light source device capable of arranging a filter in an optical path smoothly with high accuracy.

The light source device of the present invention includes a rotating plate provided with a plurality of observation filters arranged in an optical path of a light source lamp, and a driving unit that rotationally drives the rotating plate by applying a rotational driving force to the rotating plate. And at least control means for controlling the rotational drive of the drive means, detection means for outputting a detection signal when the rotary plate reaches a predetermined position, and a moving force for moving the rotary plate to the initial position And a rotating plate position detecting unit having a moving force applying unit that applies a force different from the rotating driving force by the driving unit to the rotating plate, and the control unit includes the rotating plate. when inputting the detection signal output from said detection means in the position detecting means, the initial said rotating plate in a rotatable state by the moving force imparting means in the rotary plate position detecting means During a time corresponding to the time required to move to the location, and controlling so as to stop the application of the rotational drive force by the drive means relative to the rotary plate.

  According to this configuration, the rotary plate initial position detecting means places the rotary plate at the specified initial position while the rotational drive of the drive device is stopped.

  ADVANTAGE OF THE INVENTION According to this invention, the light source device which can perform the rotation angle control of a turret with high precision and smoothly is realizable.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 10 relate to an embodiment of the present invention, FIG. 1 is a block diagram for explaining the configuration of an endoscope apparatus, and FIG. 2 shows the configurations of an illumination light rotating device and an illumination rotating plate initial position detecting means. FIG. 3 is a diagram for explaining an initial rotation position and a switch-on state position of the illumination rotating plate, FIG. 4 is a diagram for explaining a process of arranging the illumination rotating plate at the initial rotation position when power is turned on FIG. 5 is a diagram for explaining the process of placing the illumination rotation plate at the initial rotation position by the position detection means, and FIG. FIG. 7 is a timing chart for explaining the timing, and FIG. 7 is a diagram for explaining the processing for rotating the illumination rotating plate arranged at the initial rotation position to place the filter in the optical path. FIG. 8 shows the filter arranged in the optical path. Condition FIG. 9 is a diagram for explaining the process of arranging different filters in the optical path, FIG. 9 is a diagram showing the positional relationship between the illumination rotating plate in which the normal observation light transmission filter is arranged in the optical path, and the switch, and FIG. It is a figure explaining the structure of a board.

  An endoscope apparatus 1 shown in FIG. 1 includes an endoscope 2, a light source device 3 that supplies illumination light to the endoscope 2, a video processor 4, and a display device 5 such as an LCD. ing.

  The endoscope 2 is provided with an illumination optical system 21 and an observation optical system 22. The illumination optical system 21 includes a light guide fiber 21a and an illumination lens group 21b. The observation optical system 22 includes an observation lens group 22a and an imaging element 22b such as a CCD. The endoscope 2 is provided with an endoscope connector 23 connected to the light source device 3. For example, an electric cable 24 connected to the video processor 4 is extended from the side portion of the endoscope connector 23.

  The video processor 4 outputs a drive signal for driving the image sensor 22 b provided in the observation optical system 22 of the endoscope 2. Further, the video processor 4 processes the image signal photoelectrically converted by the image sensor 22 b into a video signal, and outputs it to the monitor 5. Further, the video processor 4 sends a dimming signal for adjusting the diaphragm position of the diaphragm device to a control unit (reference numeral 31) described later of the light source device 3 so that the image has an appropriate brightness based on the image signal. Output.

An endoscopic image based on the video signal output from the video processor 4 is displayed on the screen of the display device 5.
The light source device 3 includes a control unit 31, a light source lamp (hereinafter abbreviated as a lamp) 32, an illumination light rotation device (hereinafter abbreviated as an illumination turret) 33, an aperture device 34, and a dimming rotation device (hereinafter referred to as a reduction). 35) (described as an optical turret), a switching regulator 36, an operation panel 37, and the like.

  The control unit 31 supplies power to the switching regulator 36 and controls the pulse motor 42 constituting the illumination turret 33, the pulse motor 34b constituting the diaphragm device 34, and the pulse motor 52 constituting the dimming turret 35, respectively.

  The lamp 32 is, for example, a xenon lamp that uses discharge in xenon gas. The spectrum of this xenon lamp approximates natural sunlight.

  The illumination turret 33 includes an illumination rotating plate 41, a pulse motor 42, and a rotating plate initial position detecting unit 43. The illumination rotating plate 41 is provided with a plurality of types of observation filters (hereinafter simply referred to as filters), which will be described later. The pulse motor 42 is a driving unit that rotates the illumination rotating plate 41. The pulse motor 42 is driven based on a control signal output from an illumination turret control unit (hereinafter abbreviated as a control unit) 70 to be described later, and arranges a desired filter in the optical path of the lamp 32. The rotary plate initial position detecting means 43 is composed of, for example, a position detection pin (hereinafter abbreviated as a pin) 44 and a position detection switch (hereinafter abbreviated as a switch) 45, and the illumination rotary plate 41 is arranged at the rotation initial position. Let The switch 45 outputs a detection signal to the control unit 31 when in the on state.

  In the present embodiment, the illumination rotary plate initial position detecting means is composed of a position detection pin and a position detection switch, but a position detection sensor such as an optical sensor is used instead of the position detection switch. It may be a configuration. In the case of that configuration, after detecting the output signal from the position detection sensor, for example, a control mechanism for stopping the motor and an operation mechanism for moving the position of the position detection pin to the vicinity of the detection position after stopping are provided. Restrictions arise.

  The diaphragm device 34 includes a diaphragm 34a disposed in the optical path and a pulse motor 34b. The stop 34a has a fan-shaped notch (not shown), and this notch is disposed in the optical path. The pulse motor 34 b is driven based on the control signal output from the control unit 31 based on the dimming signal output from the video processor 4. Specifically, when the amount of light is insufficient, the diaphragm 34a is operated so as to increase the amount of light transmitted through the notch by driving the pulse motor 34b. On the other hand, when the amount of light is excessive, the diaphragm 34a is operated so as to reduce the amount of light transmitted through the notch by driving the pulse motor 34b.

  The dimming turret 35 includes a dimming rotary plate 51 provided with a plurality of types of dimming meshes described later, a pulse motor 52, and a rotary plate initial position detecting means 53. The pulse motor 52 is driven based on a control signal output from a dimming turret control unit (not shown), and arranges a desired dimming mesh in the optical path of the lamp 32. The rotating plate initial position detecting means 53 is composed of, for example, a pin 54 and a switch 55, and arranges the dimming rotating plate 51 at the rotation initial position. The switch 55 outputs a detection signal to the control unit 31 when in the on state.

  The switching regulator 36 is a power supply stabilizer, converts the input voltage supplied from the control unit 31 into a DC voltage, and supplies it to the lamp 32 and the emergency light 46.

  The operation panel 37 is provided with a power switch 37a, an emergency light display unit, a lamp control setting display unit, an illumination mode setting / display unit, and the like.

  Power is supplied to the light source device 3 by turning on the power switch 37a.

  The emergency light display portion is turned on when the lamp 32 is turned off and the emergency light 46 is switched to. The emergency display section blinks when there is a malfunction such as the emergency light being turned off, disconnected, or not attached.

  The lamp control setting display section is provided with a lamp on / off switch 37b and the like. The lamp on / off switch 37b is a switch for turning on / off the lamp 32 in a state where the power switch 37a is turned on. The illumination mode setting / display unit is provided with a plurality of filter selection switches 37c and an illumination mode display unit. The filter selection switch 37c is a filter selection means for selecting a filter. The illumination mode display unit notifies the user of the type of observation light.

  As shown in FIG. 2, in addition to the emergency light 46, a plurality of types of filters 61, 62, 63, 64a and 64b are arranged on the illumination rotating plate 41 at equal intervals in the circumferential direction. These filters 61, 62, 63, 64 a, 64 b are arranged in the clockwise direction from the emergency light 46, the infrared observation light transmission filter 61, the normal observation light transmission filter 62, the narrow band observation light transmission filter 63, and the first fluorescence observation. A light transmission filter (hereinafter abbreviated as a first fluorescence filter) 64a and a second fluorescence observation light transmission filter (hereinafter abbreviated as a second fluorescence filter) 64b.

  Further, a pin 44 projects from the illumination rotating plate 41 in the vicinity of the normal observation light transmission filter 62 and on the outer peripheral end side. The illumination rotating plate 41 is fixed to the rotating shaft 42a of the motor 42 via a coupling (not shown).

  The switch 45 is, for example, a mechanical toggle switch with a built-in spring. For this reason, as shown in FIG. 3, after the pin 44 contacts the bar 45a indicated by the solid line constituting the switch 45, the bar 45a is moved to the position indicated by the broken line. Then, a detection signal is output from the switch 45 toward the control unit 31, and the switch is turned on. Thereafter, the bar 45a is returned to the origin as shown by the solid line by the biasing force of the spring. At this time, the position of the pin 44 of the illumination rotating plate 41 is also returned to the position indicated by the solid line along with the movement of the bar 45a. The position where the pin 44 is returned is the rotation initial position of the illumination rotating plate 41.

  The amount of energy acting on the pins 44 varies depending on the amount of rotational movement of the illumination rotating plate 41. Then, it is conceivable that the pin 44 is moved further downward in the figure from the position of the broken line by changing the amount of energy acting on the pin. In order to eliminate this problem, a stopper member that contacts the pin 44 at a predetermined position may be provided. As a result, the urging force of the spring always acts on the pin 44 with the same amount of force.

  The control unit 31 in FIG. 1 includes an illumination turret control unit 70. The illumination turret control unit 70 controls the detection means 71, the time measuring means 72, the rotating plate drive control means 73, the counting means (not shown), and the like.

  The detection means 71 includes a detection signal output from the switch 45, a switch 25a, 25b,... Of the endoscope 2, a foot switch 6 including the switches 6a, 6b, or a filter selection signal output from the filter selection switch 37c. A lamp on signal or the like output from the lamp on / off switch 37b is input. The control unit 70 performs an initial position arrangement process in response to the input of a lamp-on signal to the detection unit 71. The detection means 71 performs a filter switching process with the input of the filter selection signal. The control unit 70 performs an initial position arrangement process (hereinafter referred to as a detection means initial position arrangement process) in which the illumination rotation plate 41 is arranged at an initial position in accordance with the input of the detection signal to the detection means 71.

  The time measuring means 72 measures the operation time corresponding to the operation being processed based on the time measurement start instruction signal output from the control unit 70.

  The rotary plate drive control means 73 controls the motor 42 to rotate and move the illumination rotary plate 41 by a predetermined amount in a predetermined direction.

  For example, when the first fluorescent filter 64a and the second fluorescent filter 64b are repeatedly switched and arranged in the optical path, the counting unit adds the switching number and monitors whether the switching number has reached the set number. To do.

  In the present embodiment, the illumination rotating plate 41 is rotated by a predetermined angle without being rotated based on the control of the control unit 31. That is, the illumination rotating plate 41 is rotated in a direction in which the pin 44 approaches the bar 45a (hereinafter referred to as clockwise) and in a direction in which the pin 44 moves away from the bar 45a (counterclockwise). .

Here, the control of the illumination turret control unit 70 will be described.
First, an initial position disposition process for disposing the illumination rotating plate 41 at the initial rotation position when the power switch 37a is operated will be described with reference to FIG.

  When the power switch 37a is turned on as shown in step S1, a power-on signal is input to the detecting means 71. As shown in step S2, the control unit 70 outputs a drive instruction signal for rotating the illumination rotating plate 41 in the clockwise direction to the rotating plate drive control unit 73 and outputs a timing start signal to the timing unit in response to the input of the power-on signal. To do. Then, the motor 42 is driven under the control of the rotary plate drive control means 73, the illumination rotary plate 41 rotates, and the pin 44 approaches the bar 45a.

  After the drive instruction signal and the timing start signal are output from the control unit 70, the detection unit 71 waits for the detection signal output from the switch 45 to be input as shown in step S3. Here, when the detection unit 71 confirms the input of the detection signal output from the switch 45, the process proceeds to step S4, and the control unit 70 performs the detection unit initial position arrangement process. As a result, the pin 44 provided on the illumination rotating plate 41 is placed at the initial rotation position shown in FIG. 3 and enters the filter selection signal input standby state.

  On the other hand, when the detection means 71 cannot confirm the input of the detection signal output from the switch 45 in step S3, the process proceeds to step S5. In step S5, the control unit 70 checks in advance whether a set time t1 (for example, 30 s) that has been set has elapsed. When it is within the set time t1, the process proceeds to step S3, and when the set time t1 has elapsed, an abnormality is notified. That is, the user is notified of the fact that there is an abnormality such as the motor 42 not rotating, by display, notification, or the like.

  Next, detection means initial position arrangement processing will be described with reference to FIGS. 5 and 6.

  The illumination rotating plate 41 is rotated clockwise, the pin 44 comes into contact with the bar 45a, and the bar 45a is moved to the position indicated by the broken line. Then, the switch 45 is turned on, and a detection signal is output as shown by the switch in FIG. That is, the detection signal output from the switch 45 is input to the detection means 71 as shown in step S11.

  As shown in step S <b> 12, the control unit 70 outputs a motor drive stop signal for stopping the driving of the motor 42 to the rotating plate drive control unit 73 in response to the input of the detection signal to the detection unit 71, and to the time measuring unit 72. Output timing start signal. As a result, as shown by the motor of FIG. 6, the motor 42 that has been in the drive state is switched to the off state. Then, the drive of the motor 42 is stopped for a preset time T (for example, 400 ms).

  When the drive of the motor 42 is stopped, as shown by the rotation in FIG. 6, the motor 42 rotates in a clockwise direction with inertia as indicated by a dotted line for a while. Thereafter, it stops once and rotates counterclockwise by the urging force of the spring provided in the switch 45. That is, the bar 45a is moved from the switch-on state position shown by the broken line in FIG. 3 to the position shown by the solid line. At this time, the pin 44 in contact with the bar 45a is also returned to the initial rotation position as the bar 45a moves.

  Whether the detection means 71 is in a state in which the detection signal output from the switch 45 is continuously input as shown in step S13 after the motor drive stop signal and the timing start signal are output from the control unit 70. Confirm whether or not.

  Here, when it becomes impossible to confirm the input of the detection signal output from the switch 45 to the detection means 71, the control unit 70 determines that the illumination rotary plate 41 is disposed at the initial rotation position, and waits for a filter selection signal input. become. On the other hand, when the detection unit 71 confirms the input of the detection signal output from the switch 45 in step S13, the process proceeds to step S14. In step S14, the control unit 70 checks whether or not a preset set time t2 (for example, 10 s) has elapsed. Here, when it is within the set time t2, the process proceeds to step S13, and when the set time t2 has elapsed, an abnormality is notified. That is, the user is notified by a display, a notification, or the like that the switch is continuously turned on without the illumination rotating plate 41 returning to the initial rotation position.

  With reference to FIG. 7, an initial filter arrangement process when the illumination rotation plate is arranged at the initial rotation position will be described.

  When any one of the filter selection switches 37c is operated as shown in step S21, a filter selection signal is input to the detection means 71. As shown in step S <b> 22, in response to the input of the filter selection signal to the detection unit 71, the control unit 70 moves the illumination rotation plate 41 counterclockwise to the rotation plate drive control unit 73 and only the rotation angle corresponding to the filter selection signal. A drive instruction signal for rotation is output, and a timing start signal is output to the timing means. Then, the motor 42 is driven under the control of the rotary plate drive control means 73, the illumination rotary plate 41 rotates, and the filter selected by the filter selection switch 37c moves toward the optical path.

  The detection means 71 confirms whether or not the motor 42 has been stopped at the rotation angle corresponding to the drive instruction signal, as shown in step S23, after the drive instruction signal and the timing start signal are output from the control unit 70. Here, when the detection unit 71 confirms that the motor 42 has stopped at the set rotation angle, a filter corresponding to the filter selection signal is placed in the optical path, and observation can be performed with desired observation light.

  On the other hand, if it is not confirmed in step S23 that the motor 42 has been stopped by the detection means 71, the process proceeds to step S24. In step S24, the control unit 70 checks in advance whether or not a preset set time t2 has elapsed. Here, when it is within the set time t2, the process proceeds to step S23, and when the set time t2 has elapsed, an abnormality is notified. That is, the user is notified by display, notification, etc. that the filter is not rotated.

  Finally, a filter switching process for switching from a state in which the filter is arranged in the optical path to another filter will be described with reference to FIG.

The filter switching process is, for example, a process of switching from the state in which the normal observation light transmission filter 62 is disposed in the optical path to the narrow band observation light transmission filter 63,
A process of repeatedly switching the first fluorescent filter 64a and the second fluorescent filter 64b disposed at a position far from the initial rotation position, and switching from the state in which the second fluorescent filter 64b is disposed in the optical path to the normal observation light transmission filter 62 Processing.

  In a state where any filter is arranged in the optical path, for example, the filter selection switch 37c for selecting another filter is operated. Then, a filter selection signal is input to the detection means 71 as shown in step S31. As shown in step S <b> 32, the control unit 70 confirms whether the filter selected by the filter selection signal input to the detection unit 71 is the first fluorescent filter 64 a or the second fluorescent filter 64 b.

  Here, when one of the fluorescent filters 64a and 64b is selected, the control unit 70 initializes the counting means as shown in step S33. Then, the process proceeds to step S 34, and a drive instruction signal for driving the motor 42 is output to the rotary plate drive control means 73 and a time measurement start signal is output to the time measurement means 72. Then, the motor 42 is driven under the control of the rotary plate drive control means 73, the illumination rotary plate 41 is rotated to replace the filter, and the filter selected by the filter selection switch 37c moves toward the optical path. Go.

  After the drive instruction signal and the timing start signal are output from the control unit 70, the detection means 71 confirms whether or not the motor 42 has been stopped at the rotation angle corresponding to the drive instruction signal, as shown in step S35. Here, when the detection means 71 cannot confirm that the motor 42 has stopped, it transfers to step S36. In step S36, the control unit 70 confirms whether or not a preset set time t2 has elapsed. Then, when it is within the set time t2, the process proceeds to step S35, and when the set time t2 has elapsed, an abnormality is notified. That is, the user is notified by display, notification, etc. that the filter is not rotated.

  On the other hand, when the detection unit 71 confirms that the motor 42 has stopped at the set rotation angle in step S35, the filter corresponding to the filter selection signal is placed in the optical path, and observation can be performed with the desired fluorescent filter. become. Thereafter, as shown in step S37, the switching number of the counting means is incremented by one. Then, as shown in step S38, it is confirmed whether or not the switching number added by the counting means has reached a preset number (for example, 50 times).

  If the number of switching has not reached the set number in step S38, the process proceeds to step S39 to check whether a new filter selection signal is input. Here, when the input of a new filter selection signal is confirmed, the process proceeds to step S40, and it is confirmed whether or not the filter selection signal is the other of the fluorescent filters 64a and 64b.

  If the filter selection signal is a signal indicating the other of the fluorescent filters 64a and 64b, the process proceeds to step S34 and the process is continued. If it is not a signal indicating the other of the fluorescent filters 64a and 64b in step S40, the process proceeds to step S51.

  If the input of a new filter selection signal cannot be confirmed by the detecting means 71 in step S39, the process proceeds to step S41. Then, it is confirmed in advance whether a set time t3 (for example, 300 s) that has been set has elapsed. If it is within the set time t3, the process proceeds to step S39. If the set time t3 has elapsed, the filter switching is completed.

  Further, when the number of switching reaches the set number in step S38, an error occurs in the filter arrangement position due to frequent switching between the first fluorescent filter 64a and the second fluorescent filter 64b. In order to prevent this, the process proceeds to step S52 described later.

  If none of the fluorescent filters 64a and 64b is selected in step S32, the process proceeds to step S51. In step S51, the control unit 70 obtains the rotation direction. At that time, the positional relationship between the filter disposed in the optical path and the filter to be replaced and disposed in the optical path is obtained by the detecting means 71. If the rotation direction of the illumination rotating plate 41 is clockwise, the process proceeds to step S52. In step S52, the control unit 70 performs the detection unit initial position arrangement process shown in FIG. That is, when the illumination rotating plate 41 is rotated in the clockwise direction at the time of exchanging the filter, the illumination rotating plate 41 is once arranged at the rotation initial position. After step S52 is completed, the process proceeds to step S53 and the initial filter placement process shown in FIG. 7 is performed. That is, the filter is switched and arranged in the optical path with the rotation initial position as a reference. This completes the filter switching.

  If the rotation direction is counterclockwise in step S51, the process proceeds to step S54. In step S <b> 54, the control unit 70 outputs a drive instruction signal for driving the motor 42 to the rotary plate drive control unit 73, and outputs a timing start signal to the timing unit 72. Then, the motor 42 is driven under the control of the rotary plate drive control means 73, the illumination rotary plate 41 is rotated to replace the filter, and the filter selected by the filter selection switch 37c moves toward the optical path. Go.

  After the drive instruction signal and the timing start signal are output from the control unit 70, the detection unit 71 confirms whether or not the motor 42 has been stopped at the rotation angle corresponding to the drive instruction signal, as shown in step S55. Here, when it is confirmed by the detection means 71 that the motor 42 has stopped at the set rotation angle, a filter corresponding to the filter selection signal is placed in the optical path so that observation can be performed with a desired fluorescent filter. . That is, the filter switching is completed.

  On the other hand, as shown in step S55, when the stop of the motor 42 cannot be confirmed by the detection means 71, the process proceeds to step S56. In step S56, the control unit 70 checks whether or not a preset set time t2 has elapsed. If it is within the set time t2, the process proceeds to step S55, and if the set time t2 has elapsed, an abnormality is notified. That is, the user is notified by display, notification, etc. that the filter is not rotated.

  As described above, the illumination rotating plate initial position detecting means is constituted by a pin provided on the illumination rotating plate and a switch including a bar biased by a spring, for example. Also, when a pin provided on the illumination rotating plate abuts the bar and a detection signal is output from the switch, the motor is stopped for a preset time T under the control of the illumination turret control unit. I am letting. For this reason, after the pin abuts and the bar is moved to the ON position, the illumination rotating plate provided with the pin is moved as the bar moves toward the origin by the biasing force of the spring of the switch. Moved to a predetermined position. That is, the illumination rotation plate is disposed at the initial rotation position.

  In this configuration, since a period for stopping the driving of the motor is provided, the rotation of the illumination rotating plate is prevented when the bar is located at the on-state position. The on-state position where the detection signal is output by the movement of the bar changes depending on the amount of energy when the pin contacts the bar. That is, the variation in the rotation start position is large. On the other hand, in the configuration of the present embodiment, in consideration of the time for moving to the rotation start position, the rotation is performed after the movement to the rotation start position is completed. For this reason, after detecting a detection signal, compared with the structure which rotates an illumination rotation board instantly, the dispersion | variation in a rotation start position is prevented, and various filters are arrange | positioned in an optical path with high precision.

  In addition, the filter may be replaced with another filter in a state where the filter is disposed in the optical path. At this time, when the illumination turret control unit determines that the pin provided on the illumination rotation plate is moved toward the switch for filter replacement, the illumination turret control unit always brings the pin into contact with the bar. Then, after obtaining the initial rotation position, the filter to be replaced is rotated by a predetermined angle with respect to the initial rotation position as a reference and is placed in the optical path. This makes it possible to correct the reference position of the illumination rotating plate during the inspection and reliably prevent the position shift due to the accumulated error.

  Furthermore, the filter may be replaced with another filter in a state where the filter is disposed in the optical path. At this time, when the illumination turret control unit determines that the filter to be replaced is a filter that is far from the rotation initial position and is adjacent to the filter, the lighting turret control unit directly does not return to the rotation initial position even if it is a clockwise rotation. The filter is switched by controlling the rotation angle. At this time, the number of switching between the filters is added. Then, it is confirmed whether or not the added switching number has reached a preset number. When the number of switching has reached the set number, an initial rotation position is acquired, and the filter is rotated by a predetermined angle with reference to the initial rotation position and rearranged in the optical path.

  Thus, when the filter is exchanged repeatedly in a short time, the filter can be exchanged smoothly for observation without returning to the initial rotation position. In addition, each time the number of switching reaches the set number, the filter can be rearranged with reference to the initial rotation position, and an error due to repeated use can be prevented from occurring at the filter arrangement position.

  In the present embodiment, the pin 44 protrudes in the vicinity of the normal observation light transmission filter 62. For this reason, as shown in FIG. 9, when the normal observation light transmission filter 62 is arranged in the optical path by rotating the illumination rotating plate 41 located at the initial rotation position, the arrangement can be performed in the shortest time. Accordingly, even when the illumination rotation plate 41 is rotated clockwise to perform filter switching, the normal observation light transmission filter 62 is disposed in the optical path in the shortest time after reaching the initial rotation position.

  The rotation control of the dimming rotating plate 51 constituting the dimming turret 35 is performed by controlling the rotation of the lighting rotating plate 41 including the plurality of filters 61, 62, 63, 64 a, 64 b, etc. constituting the lighting turret 33. Is substantially the same.

  That is, the dimming rotating plate 51 is provided with a long hole-shaped portion 51a in which, for example, four circles are formed in a daisy chain shape. For example, trapezoidal light-reducing mesh filters 92a, 92b, and 92c are attached to the long hole-shaped portion 51a.

  The dimming mesh filters 92a, 92b, and 92c are, for example, formed by braiding fine wires such as metal materials into a single layer or a plurality of layers. The transmittance of the light-reducing mesh filters 92a, 92b, and 92c is, for example, 50%, 65%, and 75% in order with respect to the opening 92d configured by the long hole-shaped portion 51a.

  A position detection pin 54 projects from a predetermined position on the outer peripheral end side of the light reduction rotating plate 51. The dimming rotating plate 51 is also fixed to the rotating shaft of the motor 52 through a coupling (not shown).

  The switch 55 is a mechanical toggle switch with a built-in spring like the switch 45. For this reason, like the pin 44 and the switch 45, after the pin 54 comes into contact with a bar (not shown) constituting the switch 55, the bar is moved to the ON state position. Then, a detection signal is output from the switch 55 toward the detection means 81 constituting the dimming turret control unit 80 provided in the control unit 31 to be turned on. Thereafter, the bar is returned to the origin by the biasing force of the spring. At this time, the position of the pin 54 of the light reduction rotating plate 51 is also returned to the initial position as the bar moves. That is, the position where the pin 54 is returned becomes the initial rotation position of the light reducing rotating plate 51.

  The dimming turret control unit 80 controls the detection unit 81, the time measuring unit 82, and the rotating plate drive control unit 83 in the same manner as the illumination turret control unit 70. Therefore, the switching control of the light-reducing mesh filters 92a, 92b, 92c and the opening 92d by the light-reducing turret control unit 80 is performed in substantially the same manner as the above-described control.

The dimming rotating plate 51 is provided with dimming mesh filters 92a, 92b, and 92c. For this reason, the weight of the dimming rotary plate 51 is lighter than the weight of the illumination rotary plate 41 provided with various filters and emergency lights. For this reason, compared with the illumination rotating plate 41, the dimming rotating plate 51 is not greatly rotated clockwise due to inertia or the like. For this reason, the stop set time T1 of the motor 52 is set to 150 ms, which is shorter than the set time T, for example.
Other configurations and control methods are substantially the same as those of the illumination turret control unit 70 described above.

  The rotational speed of the rotating plate described above may be changed when a specific filter is switched.

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

Block diagram for explaining the configuration of the endoscope apparatus The figure explaining the structure of the rotation apparatus for illumination light, and the illumination rotary plate initial position detection means The figure explaining the rotation initial position of a rotation board, and a switch-on state position The figure explaining the process which arrange | positions an illumination rotation board in the rotation initial position at the time of power activation The figure explaining the process by which an illumination rotation board is arrange | positioned in an initial rotation position by a position detection means Timing chart explaining the timing of the illumination rotating plate, the switch, the motor, and the filter selection signal during the detection means initial position arrangement processing The figure explaining the process which rotates the illumination rotation board arrange | positioned in the initial rotation position, and arrange | positions a filter in an optical path. The figure explaining the process which arrange | positions a different filter in an optical path in the state by which the filter is arrange | positioned in an optical path The figure which shows the positional relationship of the illumination rotation board which has arrange | positioned the normal observation light transmission filter in the optical path, and a switch. The figure explaining the composition of a dimming rotating plate

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Light source device 31 ... Control part 33 ... Illumination turret 41 ... Illumination rotary plate 42 ... Motor 43 ... Rotary plate initial position detection means 44 ... Pin 45 ... Switch 45a ... Bar 70 ... Illumination turret control part 71 ... Detection means 72 ... Timekeeping Means 73 ... Rotary plate drive control means

Claims (4)

A rotating plate provided with a plurality of observation filters arranged in the optical path of the light source lamp ;
Drive means for rotationally driving the rotary plate by applying a rotary driving force to the rotary plate ;
Control means for controlling at least the rotational drive in the drive means;
A detecting means for outputting a detection signal when the rotating plate reaches a predetermined position, and a moving force for moving the rotating plate to an initial position, which is different from the rotational driving force by the driving means. A moving force applying means for applying to the rotating plate; a rotating plate position detecting means having
With
Wherein, upon receiving the detection signal output from said detection means in the rotation plate position detecting means, by said moving force applying means and said rotating plate in a rotatable state in the rotary plate position detecting means The light source device is controlled to stop applying the rotational driving force by the driving means to the rotating plate during a time corresponding to a time required to move to the initial position . A filter selection means for outputting a filter selection signal for selectively arranging the observation filter provided in the rotating plate in the optical path ;
When the filter selection signal for placing another observation filter instead of one observation filter arranged in the optical path is input to the control means,
The control means acquires the direction in which the rotating plate is rotated when replacing one observation filter in the optical path with another observation filter, and according to the rotation direction,
2. The light source device according to claim 1, wherein the other observation filter is disposed in an optical path with reference to an initial position of the rotating plate or a position of one observation filter. The rotating plate position detecting means includes a pin for identifying a position of the rotary plate, and a bar that moves the more pressing in the pin, and a switch for outputting the detection signal in response to movement of the bar, comprises,
When the pin rotates toward the bar , after identifying the initial position of the rotating plate, another observation filter is placed in the optical path, and when the pin rotates away from the bar , one observation the light source device according to another observation filters located criteria of the filter to claim 1 or 2, characterized in that disposed in the optical path. When the control means performs the control to alternately and repeatedly arrange the observation filters arranged at positions adjacent to each other in the optical path in the optical path,
The control means performs control to reposition the position of the observation filter disposed in the optical path in the optical path again after identifying the initial position of the rotating plate when the number of switching times reaches the set number of times. the light source device according to claim 2 or 3, characterized in.

Images