JP4761864B2 - Endoscope light source device - Google Patents

Description

  The present invention relates to an endoscope light source device for supplying light to an endoscope and an operation method of the endoscope light source device.

  A light guide fiber (LCB: light carrying bundle) as a light guide is arranged inside the endoscope, and the outer periphery of the incident side end of the light guide fiber is a cylindrical shape provided in the endoscope. Covered by a light carrying bundle sleeve. When the light carrying bundle sleeve is inserted into the light source connection hole provided in the case of the endoscope light source device and the light source in the endoscope light source device is turned on, the light emitted from the light source is guided to the light guide fiber. The incident end face is irradiated. The light irradiated to the incident end surface is guided to the illumination optical system provided at the distal end of the insertion portion of the endoscope through the inside of the light guide fiber, and directed from the illumination optical system to the outside of the endoscope. When fired, it illuminates the body cavity and inside the machine.

In general, an endoscope light source device includes a rotation stop for adjusting the amount of illumination light irradiated to a light guide fiber by rotating in a plane orthogonal to the light source optical axis. When the rotary diaphragm is rotated, the amount of illumination light applied to the light guide fiber changes, and the amount of light applied to the observation unit from the illumination optical system at the distal end of the endoscope changes (for example, Patent Document 1).
JP 2001-340293 A

  As described above, an endoscope light source device has conventionally been provided with a light control device that adjusts the amount of illumination light by rotating a rotary diaphragm. This illumination device completely blocks illumination light. I can't do that. Therefore, when it is desired to temporarily block the illumination light temporarily, it is necessary to turn off the light source. However, the xenon lamp generally used as a light source is a discharge-type lamp using a high voltage, and if it is frequently turned on and off, it may adversely affect the surrounding electronic circuits and electronic devices. Ideally, you don't want to switch on / off the xenon lamp while using the endoscope.

An object of the present invention is to provide an endoscope light source device that can dimm and block illumination light by a dimming device without turning off the light source.

An endoscope light source device according to the present invention includes a light guide fiber that extends from an insertion portion of an endoscope into a universal tube, a light source that provides illumination light to an incident end face of the light guide fiber, and an incident end face of the light guide fiber. arc and located between the light source, and Kaidoshibo capable pivoting movement about an axis parallel to the illumination optical axis, which intersects this Kaidoshibo, the illumination optical path and around the rotational axis A light control opening that is formed on the top and changes the amount of transmitted light according to the rotation position to change the amount of illumination light applied to the incident end face of the light guide fiber, and the rotation position of the rotation diaphragm is required for illumination. A rotation control mechanism that changes in accordance with the amount of light, and the rotation diaphragm has a light-shielding section that is continuous with the light control section, and the rotation control mechanism rotates the rotation diaphragm. The illumination light quantity is changed by positioning the dimming aperture on the illumination optical path. And a light state, Ri can der switched to a light shielding state to completely shielded by positioning on the illumination optical path of the light shielding part, further emit special light for fluorescence observation, sending the special light to the incident end face When the light source is lit and the light source is turned on and the rotary diaphragm is dimmed by the dimming aperture, the special light source is turned off and the rotary diaphragm is When the illumination light is completely blocked, the light source switching means that enables the special light source to be turned on is provided .

  The light source can be constituted by, for example, a xenon lamp.

  It is practical that the rotation control mechanism includes a light blocking stopper that restricts one rotation end of the rotation stop at a light blocking position where the light blocking portion is positioned on the illumination optical path.

  The light-blocking stopper restricts the rotation range of the rotation diaphragm within a range in which the amount of illumination light is adjusted by the light adjustment opening, and the light-control restriction position defines the rotation range of the rotation diaphragm. Dimming / light-blocking stopper that can be moved to a light-blocking restriction position that is restricted by the light-blocking, and a stopper position switch that selectively moves the light-control / light-blocking stopper to the light adjustment restriction position and the light-blocking restriction position A mechanism is preferably provided.

  The light source and the special light source are preferably housed in a single casing.

  The light source and the special light source may be housed in separate casings.

  According to the present invention, it is possible to perform dimming and shielding of illumination light by the dimming device. Therefore, when it is desired to temporarily stop the supply of illumination light to the light guide fiber, it is not necessary to turn off the light source.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
An electronic endoscope (endoscope) 10 shown in FIG. 1 has an operation unit 11 and an insertion unit 12, and the distal end portion of the insertion unit 12 corresponds to an operation of a bending operation device 13 provided in the operation unit 11. A bending portion 12a that is bent in the vertical and horizontal directions is provided. An observation window (object window) and an illumination optical system (not shown) are provided on the distal end surface of the bending portion 12a.

A universal tube 14 extends from the operation unit 11, and a metal carrying light carrying bundle sleeve 14 b and a signal connection unit 14 c project from a connector portion 14 a provided at the tip of the universal tube 14. Has been. Further, a light guiding fiber (LCB: light carrying bundle) 15 is disposed inside the light carrying bundle sleeve 14b, the connector portion 14a, the universal tube 14, the operation portion 11 and the insertion portion 12, and formed at the tip thereof. The emitted emission end face is connected to the illumination optical system inside the distal end of the insertion portion 11.
2 and 3, in the processor (endoscope light source device) 20, the front plate 21a of the casing (housing) 21 (the lower right side of FIG. 2 is the front and the upper left side is the rear). Are provided with a light source connection hole 22 for inserting the light carrying bundle sleeve 14b of the connector part 14a and a signal connection part support hole 23 for inserting the signal connection part 14c.

As shown in FIGS. 3 and 4, a condensing lens L <b> 1 that is coaxial with the light source connection hole 22 is disposed in the casing 21 in a mode that is located immediately after the light source connection hole 22. The condenser lens L1 is coaxial with the light source connection hole 22. Furthermore, a substantially vertical support plate 30 is fixed to the bottom plate 21b in a mode that is located immediately after the condenser lens L1. Although not shown, a light guide hole 22 and a light guide hole coaxial with the condensing lens L1 are formed in the center of the support plate 30. Fixing portions 32 are provided at both left and right end portions of the rear surface of the support plate 30 (only the right side is shown in FIG. 3), and a guide bar 33 is provided between the left and right fixing portions 32 so as to face in the left-right direction. A rotation drive shaft 35 facing in the front-rear direction is rotatably supported on the support plate 30, and the rotation drive shaft 35 protrudes rearward of the support plate 30. The rotary drive shaft 35 can rotate about its axis, and a pinion 36 is formed on the peripheral surface thereof. The rotation drive shaft 35 is linked to a slide motor (not shown). When the slide motor rotates, the rotation drive shaft 35 receives this driving force and rotates in both forward and reverse directions.
A slide member 37 is supported (guided) on the guide bar 33 so as to be slidable in the left-right direction and not rotatable around the guide bar 33. A rack 38 that always meshes with the pinion 36 is formed on the upper surface of the slide member 37, and when the rotation drive shaft 35 rotates in both forward and reverse directions, the slide member 37 reciprocates in the left-right direction along the guide bar 33.

  A mirror storage box 40 is fixed to the lower surface of the slide member 37. The mirror FM shown in FIG. 4 is housed inside the mirror housing box 40, and the front surface of the mirror housing box 40 is open and faces the light guide hole. Above the mirror storage box 40, the lens storage box 42 is disposed so as not to move in a manner positioned behind the slide member 37. Corresponding portions of the lower surface of the lens storage box 42 and the lens storage box 42 on the upper surface of the mirror storage box 40 are open, and when the mirror storage box 40 moves directly below the lens storage box 42, the internal spaces of the two are communicated. . A lens L3 shown in FIG. 4 is disposed inside the lens storage box. Furthermore, an opening formed at one end of a covering tube 44 made of a flexible material such as a synthetic resin is connected to the upper surface of the lens storage box 42, and an opening formed at the other end of the covering tube 44. Are connected to a laser light source device SL fixed to the bottom plate 21b. A light guide fiber 45 for guiding laser light (special light) generated by a laser light source (special light source, not shown) built in the laser light source device SL to the lens L3 is disposed inside the covering tube 44. Yes.

A metal support plate 50 is fixed to the bottom plate 21 b of the casing 21 in a mode located immediately after the mirror storage box 40. A lens support hole is formed as a through hole in a substantially central portion of the support plate 50, and a light source connection hole 22, a condensing lens L1, and a lens L2 coaxial with the light guide hole are fitted into the lens support hole. It is fixed. On the rear surface side of the support plate 50, a rotary diaphragm 52 is rotatably supported by a rotation drive shaft (rotation control mechanism) 51 facing in the front-rear direction, and a rear end portion of the rotation drive shaft 51 is an opening / closing motor (rotation). Control mechanism) Connected to DM. The rotary diaphragm 52 is a metal plate parallel to a plane orthogonal to the front-rear direction, and a dimming notch (a dimming aperture) whose rough shape forms an arc shape centering on the rotation drive shaft 51 at the lower end thereof. ) 53 is formed. The peripheral portion of the light adjustment notch 53 at the lower end of the rotary stop 52 constitutes a light shielding portion 54 that is continuous with the light adjustment notch 53 and shields illumination light. On the rear surface of the support plate 50, a pair of left and right stoppers that regulate the rotation range of the rotation diaphragm 52, that is, a light control stopper (rotation control mechanism) 55 and a light shielding stopper (rotation control mechanism) 56 (FIGS. 5 and 5). 6) is projected. Both the light adjustment stopper 55 and the light blocking stopper 56 are located on the rotation locus of the rotary diaphragm 52. When the opening / closing motor DM rotates in both the forward and reverse directions, this driving force is transmitted to the rotary diaphragm 52 via the rotary drive shaft 51, and the rotary diaphragm 52 has its side surfaces on the light control stopper 55 and the light blocking stopper 56. Rotates within the contact area.
Immediately after the rotation stop 52 of the bottom plate 21b of the casing 21, a support member (not shown) protrudes upward, and the lens holder 60 is supported on the upper end of the support member. The lens holder 60 supports a condensing lens L4 that is coaxial with the light source connection hole 22 and the condensing lens L1.
Further, immediately after the lens holder 60 of the bottom plate 21 b of the casing 21, a support member (not shown) protrudes upward, and a light source connection hole 22, a condensing lens L <b> 1, A white light source (normal light source) ML that is coaxial with the condenser lens L4 is supported. The white light source ML is a xenon lamp, and white light is emitted from the front surface thereof.

  As shown in FIG. 2, the front plate 21a of the casing 21 has a lighting switch S1 for switching ON / OFF of the white light source ML, a lighting switch S2 for switching ON / OFF of the laser light source device SL, and a rotary diaphragm 52 in the closing direction. A closing direction adjustment switch B1 for rotating, an opening direction adjusting switch B2 for rotating the rotary diaphragm 52 in the opening direction, and a main switch MS are provided. The main switch MS, the lighting switch S1, the lighting switch S2, the closing direction adjusting switch B1, the opening direction adjusting switch B2, the opening / closing motor DM, and the sliding motor for rotating the rotation drive shaft 35 are all the processor 20. It is electrically connected to a control means C (rotation control mechanism) (light source switching means) (see FIG. 2) constituted by a CPU or the like built in.

Next, the operation in the case of observing the body cavity of a human body (patient) using the endoscope system having such a configuration will be described.
When the light carrying bundle sleeve 14b of the electronic endoscope 10 is inserted into the light source connection hole 22 of the processor 20, the circular incident end face 15a (see FIG. 4) of the light guide fiber 15 is coaxially opposed to the condenser lens L1. To do. In this state, when the main switch MS is turned on and the lighting switch S1 is turned on, the control means C turns on the white light source ML. Further, since the control means C detects that the lighting switch S2 is OFF, the control means C rotates the slide motor, and connects the mirror housing box 40 to the condenser lens L4 and the light guide hole of the support plate 30. Retreat from the straight line to the side (at the same time, retreat from the position directly below the lens storage box 42 to the side). The illumination light generated by the white light source ML passes through the condensing lens L4, the dimming notch 53 of the rotary diaphragm 52, the lens L2, the light guide hole of the support plate 30, and the condensing lens L1. The incident end face 15a is irradiated (the symbol O shown in FIG. 4 is the illumination optical axis and the illumination optical path, and the rotation drive shaft 51 is parallel to the illumination optical axis O. The illumination optical axis O is the white light source ML, the light collection. This coincides with the common central axis of the lens L4, the light transmission hole of the support plate 50, the light guide hole of the support plate 30, the condensing lens L1, and the incident end face 15a of the light guide fiber 15. Further, the light control notch 53 is provided. Crosses the illumination light path O). The illumination light that has passed through the light guide fiber 15 is emitted to the outside from an illumination optical system provided at the distal end portion of the electronic endoscope 10, and irradiates a subject (affected part, not shown) in the body cavity. Accordingly, normal observation in the body cavity can be performed by the electronic endoscope 10, and a subject image in the body cavity is displayed on a television monitor (not shown) connected to the processor 20.

  When it is desired to adjust the illumination light quantity (transmission quantity) during observation with the illumination light of the white light source ML, the closing direction adjustment switch B1 and the opening direction adjustment switch B2 are pushed. When the closing direction adjustment switch B1 is pushed, the opening / closing motor DM is started, and the rotation diaphragm 52 is rotated counterclockwise (closed direction) in FIGS. As shown in FIG. 5, as the rotary diaphragm 52 rotates in the closing direction, the amount of illumination light passing through the dimming notch 53 and going to the light transmitting hole of the support plate 50 is reduced. The portion shielded by the light shielding portion 54 increases. Then, as shown in FIG. 6, when the side surface of the rotary stop 52 comes into contact with the light blocking stopper 56, the rotary stop 52 reaches the light blocking position. At this time, since the light beam LB is completely shielded by the light shielding portion 54 of the rotary stop 52, the illumination optical system of the electronic endoscope 10 does not irradiate the subject in the body cavity, and a dark image is displayed on the television monitor. Is done. On the other hand, when the opening direction adjustment switch B2 is pushed, the opening / closing motor DM is operated, and the rotation diaphragm 52 is rotated in the clockwise direction (opening direction) in FIGS. As the rotary diaphragm 52 rotates in the opening direction, the amount of illumination light that passes through the dimming notch 53 and travels toward the light transmitting hole of the support plate 50 increases, so that the periphery of the subject in the body cavity becomes brighter. The image displayed on the TV monitor is displayed brighter. Then, as shown by the broken line in FIG. 5, when the side surface of the rotary diaphragm 52 comes into contact with the dimming stopper 55, the rotary diaphragm 52 reaches the fully open position, and the amount of illumination light applied to the subject is maximized. .

  When the lighting switch S1 is turned on in this way and the lighting switch S2 is further switched to the ON side, the control means C operates the slide motor, the laser light source device SL, and the opening / closing motor DM. The rotation drive shaft 35 (pinion 36) rotates by the operation of the slide motor, and the slide member 37 slides along the guide bar 33. Then, the mirror storage box 40 (mirror FM) is positioned on the illumination optical path O, and the mirror storage box 40 is positioned directly below the lens storage box 42. Further, since the laser light source of the laser light source device SL is turned on, the laser light is irradiated to the mirror FM through the light guide fiber 45 and the lens L3. The laser light applied to the mirror FM is reflected forward by the mirror FM, and enters the front end of the mirror housing box 40, the light guide hole of the support plate 30, and the condensing lens L1, and the incident end face 15a of the light guide fiber 15. Is irradiated. Further, since the opening / closing motor DM is operated and the rotation diaphragm 52 is rotated to the light shielding position, the illumination light of the white light source ML is totally shielded by the rotation diaphragm 52. Therefore, since only the laser light is emitted from the illumination optical system of the electronic endoscope 10 to the subject in the body cavity, so-called fluorescence observation can be performed. When the affected part is a normal tissue, the affected part is observed in a bright state. When the affected area is an abnormal tissue such as a malignant tumor, it is observed in a dark state.

Further, while the laser light source of the laser light source device SL is lit in this way (while the lighting switch S2 is ON), the opening direction adjustment switch B2 is pushed to operate the rotary diaphragm 52 in the opening direction. When it is rotated again, the control means C automatically turns off the laser light source device SL, and the illumination light of the white light source ML passes through the dimming notch 53 of the rotary diaphragm 52 and the light guide fiber 15 of the electronic endoscope 10. To be supplied. The mirror FM is a dichroic reflection mirror having wavelength selectivity, and transmits white light other than the laser wavelength (that is, a coating that reflects 90 ° of only the laser wavelength light). With this selectivity, the illumination light of the white light source ML can be incident on the light guide fiber 15 even when the mirror FM is on the illumination optical path O (note that the laser wavelength component when white light passes through the mirror). Since the light is reflected by the mirror, it becomes white light from which a part of the color (blue component) is missing. (A command may be sent to the motor to retract the mirror storage box 40 (mirror FM) to the side. Use this mode if you want to perform accurate white observation.) Further, in this state, the closing direction adjustment switch B1 is turned on. When the rotary diaphragm 52 is pushed again and reaches the light shielding position again, the control means C automatically turns on the laser light source device SL again, and the laser light is supplied to the light guide fiber 15 of the electronic endoscope 10.
When the observation by the electronic endoscope 10 is finished, the lighting switch S1, the lighting switch S2, and the main switch MS are switched to the OFF side, both the white light source ML and the laser light source device SL are turned off, and the light carrying of the electronic endoscope 10 is performed. The bundle sleeve 14 b is extracted from the light source connection hole 22 of the processor 20.

According to the present embodiment described above, not only the illumination light of the white light source ML can be adjusted by the rotation stop 52 but also the illumination light of the white light source ML can be completely blocked by the rotation stop 52. Therefore, when it is not desired to give the illumination light of the white light source ML to the electronic endoscope 10, it is not necessary to switch the lighting switch S1 to the OFF side.
Furthermore, since the xenon lamp constituting the white light source ML is a discharge type lamp using a high voltage, it is not preferable to repeatedly turn on and off due to its nature. Therefore, if the illumination light of the white light source ML is shielded by the rotary diaphragm 52 without switching the ON / OFF of the lighting switch S1 as in this embodiment, the number of ON / OFF switching times of the lighting switch S1 during observation is reduced. Therefore, the possibility of adverse effects on electronic devices and electronic circuits around the white light source ML can be reduced as compared with the conventional device.

Next, a second embodiment of the present invention will be described with reference mainly to FIGS. The same members as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof are omitted.
The feature of this embodiment is that a light control and light blocking stopper (rotation control mechanism) 57 is provided instead of the light blocking stopper 56. The light control / light blocking stopper 57 of the present embodiment is not fixed to the support plate 50, and is supported by a known electromagnetic solenoid (stopper position switching mechanism) 75 fixed to the rear surface of the support plate 50 by a pair of fixing screws 70. Has been. The electromagnetic solenoid 75 includes a hollow cylindrical member 76, a movable iron core 77 that passes through the cylindrical member 76 and is relatively movable in the axial direction thereof, and a coil (electromagnet, not shown) built in the cylindrical member 76. . Further, a spring means for moving and urging the movable iron core 77 to the upper right in FIGS. 7 and 8 is disposed inside the cylindrical member 76. The light control / light blocking stopper 57 is fixed to the upper end of the movable iron core 77. The coil is electrically connected to control means (stopper position switching mechanism) C.

The front plate 21a is provided with a full-close permission switch S3. When the full-close permission switch S3 is turned on, the control means C causes a current to flow through the coil built in the electromagnetic solenoid 75, thereby exciting the coil and electromagnet. To function as. Then, the movable iron core 77 moves from the position shown by the solid line in FIG. 7 and the phantom line in FIG. 8 to the lower left side in FIG. 7 and FIG. However, it moves from the light control restriction position indicated by the solid line in FIG. 7 and the virtual line in FIG. 8 to the light blocking restriction position indicated by the solid line in FIG.
When the dimming / shading stopper 57 is in the dimming restriction position and the side surface of the rotary diaphragm 52 comes into contact with the dimming / shading stopper 57, the rotary diaphragm 52 is in the position indicated by the solid line in FIG. To position. At this time, the rotary stop 52 (light-shielding part 54) does not completely shield the light beam LB, but most of the light beam LB is shielded, and only a small part of the light beam LB passes through the dimming notch 53. Thus, when the light control / light blocking stopper 57 is in the light control restriction position, the rotary diaphragm 52 functions as a light control member.
On the other hand, when a current is passed through the coil of the electromagnetic solenoid 75 and the rotary diaphragm 52 is moved to the light blocking restriction position shown in FIG. The rotary diaphragm 52 is located at the light shielding position. As shown in FIG. 8, when the rotary stop 52 is positioned at the light blocking position, the light beam LB is completely blocked by the light blocking portion 54 of the rotary stop 52.

  As described above, when the position of the light control / light blocking stopper 57 is moved between the light controllable position and the light shieldable position, the rotary diaphragm 52 is moved to a mode exclusively for light control and a mode capable of light control and light shielding. This is convenient because it is possible to switch between and.

Finally, a third embodiment of the present invention will be described with reference mainly to FIGS. The same members as those in the first embodiment are given the same reference numerals, and detailed descriptions thereof are omitted.
The feature of this embodiment is that the processor 20 incorporates only the white light source ML for normal observation, and the laser light source device SL (not shown in FIGS. 9 and 10) is incorporated in the laser light source device 80 separate from the processor 20. It is in the point made to do.
As shown in FIG. 10, the processor 20 includes a condenser lens L1, a condenser lens L4, a support plate 50 (not shown in FIG. 10), a rotary diaphragm 52, a rotary drive shaft 51, an opening / closing motor DM, And a white light source ML. However, the support plate 30, the guide bar 33 integrated with the support plate 30, the slide member 37, the mirror storage box 40, the lens storage box 42, the covering tube 44 and the like are not provided. Therefore, when the white light source ML is turned on, the illumination light passes through the condenser lens L4, the dimming notch 53 of the rotary diaphragm 52, the lens L2 of the support plate 50, and the condenser lens L1, and the light guide fiber 15 The incident end face 15a is irradiated. Further, a lighting switch S1, a closing direction adjustment switch B1, an opening direction adjustment switch B2, and a main switch MS are provided on the front plate 21a of the casing 21, but the lighting switch S2 is not provided.

  A laser light source device SL (not shown in FIGS. 9 and 10) is built in the laser light source device 80, and the front panel 81 of the laser light source device 80 is used to switch the laser light source device SL on and off. A lighting switch S4 is provided. Further, the front panel 81 of the laser light source device 80 is provided with a main switch MS and an insertion hole 82. One end side of the covering tube 85 made of a flexible material such as a synthetic resin is inserted into the insertion hole 82 in a removable manner. A light guide fiber (not shown) is provided in the inside of the covering tube 85 over the entire length thereof. The distal end (the other end) 86 of the covering tube 85 is inserted into the electronic endoscope 10 from the forceps port 16 of the electronic endoscope 10, and the distal end 86 of the covering tube 85 passes through the insertion portion 12 and is inserted into the insertion portion. 12 protrudes to the outside of the electronic endoscope 10 through an opening (not shown) formed at the distal end of 12.

The endoscope system of the present embodiment operates as follows.
First, the light carrying bundle sleeve 14b and the signal connecting portion 14c of the electronic endoscope 10 are connected to the processor 20, and further, both ends of the covering tube 85 are connected to the electronic endoscope 10 and the laser light source device 80. The main switch MS of the processor 20 and the laser light source device 80 is turned on. If the lighting switch S1 is turned on in this state, the white light source ML is turned on. Therefore, if the light beam LB is not completely shielded by the rotation stop 52, normal observation can be performed by the electronic endoscope 10.
Furthermore, when performing fluorescence observation with the white light source ML turned on in this way, first, the closing direction adjustment switch B1 is pressed to rotate the rotary diaphragm 52 to the light shielding position, and the illumination light of the white light source ML Is completely shielded from light. Next, the lighting switch S4 of the laser light source device 80 is turned on to turn on the laser light source of the laser light source device SL. Then, the laser light emitted from the laser light source passes through the light guide fiber provided inside the coated tube 85 and is emitted from the tip 86 to the outside of the electronic endoscope 10, so that fluorescence observation can be performed.
When the observation by the electronic endoscope 10 is finished, the lighting switch S1 of the processor 20, the lighting switch S4 of the laser light source device 80, and the main switch MS of the processor 20 and the laser light source device 80 are switched to the OFF side, and the white light source ML and laser are switched. Both the light source devices SL are turned off. Then, the universal tube 14 of the electronic endoscope 10 is extracted from the light source connection hole 22 of the processor 20, and the covering tube 85 is extracted from the insertion hole 82 of the laser light source device 80.

According to this embodiment as well, not only the illumination light of the white light source ML can be adjusted by the rotation stop 52, but also the illumination light of the white light source ML can be completely blocked by the rotation stop 52, so the white light source ML. When it is not desired to give the illumination light to the electronic endoscope 10, it is not necessary to switch the lighting switch S1 to the OFF side, so that the number of ON / OFF switching of the lighting switch S1 can be reduced.

1 is an external view showing an electronic endoscope according to a first embodiment of the present invention. It is a perspective view of the connector part of a processor (light source device for endoscopes) and an electronic endoscope. It is a perspective view which shows the mode in a processor. It is a schematic diagram conceptually showing a light guide mechanism arranged in the processor for guiding each light flux of a normal light source and a special light source to a light carrying bundle sleeve. It is a rear view for demonstrating the light control operation | movement by a rotation aperture stop. It is a rear view for demonstrating the light-shielding operation | movement by a rotation aperture stop. It is a rear view of the rotation aperture_diaphragm | restriction of the 2nd Embodiment of this invention, and its peripheral member. It is a rear view when a rotation aperture is moved to a light-shielding position. It is a perspective view of the connector part of the processor (light source device for endoscopes) of the 3rd Embodiment of this invention, a laser light source device, and an electronic endoscope. It is a schematic diagram conceptually showing a light guide mechanism arranged in the processor for guiding a light beam of a normal light source to a light carrying bundle sleeve.

Explanation of symbols

10 Electronic endoscope (endoscope)
DESCRIPTION OF SYMBOLS 11 Operation part 12 Insertion part 12a Bending part 13 Bending operation apparatus 14 Universal tube 14a Connector part 14b Light carrying bundle sleeve 14c Signal connection part 15 Light guide fiber 15a Incident end face 16 Forceps port 20 Processor (light source device for endoscope)
21 casing 21a casing front plate 21b bottom plate 22 light source connection hole 23 signal connection portion support hole 30 support plate 32 fixing portion 33 guide bar 35 rotation drive shaft 36 pinion 37 slide member 38 rack 40 mirror storage box 41 support hole 42 lens storage Box 44 Covered tube 45 Light guide fiber 50 Support plate 51 Rotation drive shaft (rotation control mechanism)
52 Rotating diaphragm 53 Dimming notch (dimming aperture)
54 Shading part 55 Dimming stopper (rotation control mechanism)
56 Light-shielding stopper (rotation control mechanism)
57 Dimming and shading stopper (rotation control mechanism)
60 Lens holder 70 Fixing screw 75 Electromagnetic solenoid (stopper position switching mechanism)
76 Cylindrical member 77 Movable iron core 80 Laser light source device 81 Front panel 82 Insertion hole 85 Cover tube 86 End of cover tube B1 Close direction adjustment switch B2 Open direction adjustment switch C Control means (rotation control mechanism) (stopper position switching mechanism) ( Light source switching means)
DM open / close motor (rotation control mechanism)
L1 L4 Condensing lens L2 L3 Lens LB Luminous flux FM Mirror ML White light source (light source)
MS Main switch O Illumination optical axis (illumination optical path)
S1 lighting switch S2 lighting switch S3 full-close permission switch S4 lighting switch SL Laser light source device (special light source)

Claims (6)

A light guiding fiber extending from the insertion portion of the endoscope into the universal tube;
A light source that provides illumination light to the incident end face of the light guide fiber;
A rotary stop located between the incident end face of the light guide fiber and the light source and capable of rotating around an axis parallel to the illumination optical axis;
The rotational aperture is formed on an arc that intersects the illumination optical path with the rotational axis as the center. Dimming aperture,
A rotation control mechanism that changes a rotation position of the rotation diaphragm according to a required amount of illumination light;
The rotary diaphragm has a light shielding part that is continuous with the light control part,
The rotation control mechanism is configured to rotate the rotation diaphragm so as to position the light control opening on the illumination optical path and change the amount of illumination light, and to position the light shielding portion on the illumination optical path. It can be switched to a light-shielding state that completely shields light,
A special light source that emits special light for fluorescence observation and transmits the special light to the incident end surface;
When the light source is turned on and the rotary diaphragm is dimmed by the dimming aperture, the special light source is turned off, and when the rotary diaphragm completely blocks the illumination light, A light source switching means that can turn on the special light source;
An endoscope light source device comprising: In the endoscope light source device according to claim 1,
An endoscope light source device, wherein the light source is a xenon lamp. The endoscope light source device according to claim 1 or 2,
The endoscope light source device, wherein the rotation control mechanism includes a light blocking stopper that restricts one rotation end of the rotary diaphragm at a light blocking position where the light blocking portion is positioned on the illumination optical path. In the endoscope light source device according to claim 3,
The light-blocking stopper restricts the rotation range of the rotation diaphragm within a range in which the amount of illumination light is adjusted by the light adjustment opening, and the light-control restriction position defines the rotation range of the rotation diaphragm. It is a dimming and shading stopper that can be moved to the shading restriction position regulated by
An endoscope light source device including a stopper position switching mechanism that selectively moves the light control and light blocking stopper between the light control restriction position and the light restriction position. The endoscope light source device according to any one of claims 1 to 4,
An endoscope light source device in which the light source and the special light source are housed in a single casing. The endoscope light source device according to any one of claims 1 to 4,
An endoscope light source device in which the light source and the special light source are housed in separate casings.

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