JP2688358B2 - Light source device for endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention supplies an illumination light suitable for a scope having a plane sequential imaging means, a scope having a color mosaic imaging means, and a fiber scope. The present invention relates to an endoscope light source device that can be used.

[Problems to be solved by conventional technology and invention] In recent years, by inserting an elongated insertion portion into a body cavity,
An endoscope (also referred to as a scope or a fiber scope) capable of observing organs in a body cavity or performing various treatments using a treatment tool inserted into a treatment tool channel as necessary.
Is widely used.

Also, various electronic scopes using a solid-state imaging device such as a charge-coupled device (CCD) as an imaging unit have been proposed. This electronic scope has advantages such as higher resolution than a fiber scope, easy recording and reproduction of images, and easy image processing such as enlargement of an image and comparison of two images.

For example, as described in Japanese Patent Application Laid-Open No. 61-82731, a surface for sequentially switching illumination light to R (red), G (green), B (blue), etc. A sequential type and, for example, as shown in JP-A-60-76888, a filter array in which color filters transmitting color lights such as R, G, and B are arranged in a mosaic pattern on the front surface of a solid-state imaging device. There is a color mosaic type (also referred to as a simultaneous type) provided. The frame sequential method has an advantage that the number of pixels can be reduced as compared with the color mosaic method, while the color mosaic method has an advantage that color shift does not occur.

Further, the electronic scopes are diversified according to the purpose of use. For example, for an upper or lower fire extinguisher, an insert having an outer diameter of about 10 mm is used. On the other hand, for bronchial use, the outer diameter is usually 5φ
Anything less than about mm is required. Thus, for various electronic scopes with a wide range of outer diameter of the insertion part,
It is impossible to use the same type of image sensor and the same type of imaging method in terms of physical and performance. That is, for example,
In order to realize an electronic scope for bronchi (small diameter), an imaging element having a small number of pixels must be used.

When the number of pixels is small as described above, in order to prevent a decrease in resolution, rather than using a color mosaic filter using a color mosaic filter, light of each wavelength of R, G, and B is illuminated in a frame sequential manner. It is advantageous to use a frame sequential color imaging system in which frame sequential imaging is performed under the illumination, and these images are combined and displayed in color.

On the other hand, for those having an outer diameter of about 10 mm, increasing the number of pixels and adopting a color mosaic imaging method is advantageous for improving image quality.

By the way, the fiber scope or the electronic scope is generally used by being connected to a light source device that supplies illumination light suitable for each scope, but in the fiber scope, the frame sequential electronic scope, and the color mosaic electronic scope. , The lighting method is different. That is, the fiberscope and the color mosaic type electronic scope require white light, and the frame sequential type electronic scope requires light that is sequentially switched to R, G, B and the like. Furthermore, even with the same frame-sequential imaging method, it is necessary to change the spectral intensity of the illumination light and the blanking period depending on the type of solid-state image sensor and the application of the endoscope. It is necessary to prepare different light source devices and perform different operations, which is not economical and efficient.

Further, in the conventional light source device, since the observation wavelength region of the illuminating light that can be emitted is fixed, it is not possible to compare a special image including, for example, blood information with a general visible region image.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a scope including an image capturing device of a frame sequential type, a scope including an image capturing device of a color mosaic type, and a fiber scope capable of being visually observed. It can supply suitable illumination light,
It is an object of the present invention to provide a light source device for an endoscope that can supply illumination light suitable for special light observation.

[Means and Actions for Solving Problems] The light source device for an endoscope according to the present invention includes a light source that emits white light as illumination light, and a light source and an object through an opening provided on an exterior plate. Between the light source and the subject through the opening provided in the first filter cassette, which has a rotary filter that can be inserted and removed freely and sequentially transmits each color light of different wavelength regions, and the light source and the subject. A filter that is insertable and removable and that can be inserted in series with the first filter cassette and that selectively transmits at least light in a specific wavelength region is selectively provided on an optical path connecting the light source and the subject. And a second filter cassette that can be inserted after being switched to.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

 1 to 11 show a first embodiment of the present invention.

As shown in FIG. 5A to FIG. 8, the endoscope apparatus 1 accommodates the light source device of this embodiment and a video processor for performing video signal processing, and various scopes (endoscopes).
Control device 1a that can connect any of 2A, 2B, 2C, 2D, 2E
It has. As shown in the figure, there are five types of scopes, namely, a field-sequential electronic scope 2A, a color mosaic-type electronic scope 2B using a color mosaic filter, and a fiber scope (hereinafter, referred to as a field-sequential television camera). There is a fiberscope with a frame sequential television camera.) 2C, a fiberscope with a color mosaic television camera externally attached (hereinafter referred to as a fiberscope with a color mosaic television camera) 2D, and a fiberscope 2E.

Each of the scopes 2A, 2B, 2C, 2D and 2E has an elongated insertion portion 3 and an operation portion 4 connected to a rear end portion of the insertion portion 3.
A universal cord (not shown) extends from the operation unit 4, and connectors for light sources 5A, 5B, 5C, 5D, and 5E are provided at the ends of the universal cord (not shown). In the frame sequential electronic scope 2A and the color mosaic electronic scope 2B, signal connectors 6A and 6B are provided on the tip side of the universal cord 4a in addition to the light source connectors 5A and 5B. In addition, the fiber scove 2C with a frame sequential TV camera and the fiber scove 2D with a color mosaic TV camera are equipped with a frame sequential TV camera 8C and a color mosaic TV camera 8D in the eyepiece 7 of the fiberscope 2E. Each TV camera 8
Signal connector extended from C, 8D at the end of the signal cable
6C and 6D are provided.

Connectors 5A, 6A; 5B, 6B; 5C, 6C; 5D, 6D for connectors 5A, 6A; 5B, 6B; 5C, 6D of the scopes 2A, 2B, 2C, 2D, 2E (hereinafter, when common to all these scopes, are represented by reference numeral 2). So that each scope 2 can be set to a usable state by connecting
For example, a set of connector receivers is provided on the front surface of the housing 1a. These connector receivers include a light source connector receiver 11 and a signal connector receiver 12. The light source connector receiver 11 has a shape capable of connecting the light source connectors 5A, 5B, 5C, 5D, 5E of the respective scopes 2 having the same shape. Further, the signal connector receiver 12 adjacent to the lower side of the light source connector receiver 11 has such a shape that the signal connectors 6A, 6B, 6C and 6D of the same scope 2 can be connected to each other. .

When using by connecting the fiber scope 2E, it is macroscopic observation, when using other scopes 2A, 2B, 2C, 2D, a color monitor 13 connected to the signal output end of the control device 1a. In this way, the captured image can be displayed in color.

The light source connectors 5A, 5B, 5C, 5
In the present embodiment, D and 5E are provided with a light guide connector and an unillustrated air / water supply connector, and the connector receiver 11 has a structure capable of connecting these. Further, in the signal connectors 6A, 6B, 6C, 6D, a scope length discriminating resistor and an electrostatic protection resistor, which are not shown, are provided, and the signal connector receiver 12 can also be connected thereto.

The light guide 14 for transmitting after illumination is inserted into each scope 2, and the light source unit of the light source device 15 in the control device 1a is inserted.
After illumination is supplied to the incident end surface from 15a, it is transmitted to the exit end surface side, and through the light distribution lens 16 arranged in front of this exit end surface, the front side of the subject can be illuminated.

In each of the scopes 2, an objective lens 17 for imaging is provided at a distal end of the insertion section 3. This objective lens 17
At the image forming position of, in both the frame sequential type or color mosaic type electronic scopes 2A or 2B, the solid-state imaging device 18 such as CCD is arranged, while the fiberscope 2E and the television camera 8C or 8D are mounted. In the fiberscope 2C or 2D with a video camera, the image guide 19 is arranged so that the incident end face thereof faces. In addition, an eyepiece 21 is provided so as to face the emission end face of the image guide 19, and in the fiber scope 2E, the eye can be brought close to the eyepiece 7 and observed with the naked eye. .

On the other hand, in the case where the frame sequential television camera 8C or the color mosaic television camera 8D is attached to the eyepiece section 7 of the fiberscope 2E, the solid state is respectively connected to the eyepiece 21 via an imaging lens (not shown) facing the eyepiece 21. An image sensor 22 is provided.

The solid-state image pickup device 18 or 22 constituting the image pickup means photoelectrically converts the optical image formed on the image pickup surface, is amplified by the preamplifier 24, and then is passed through the signal transmission line to the signal connector 6.
(Representing 6A, 6B, 6C, and 6D) and transmitted to the video processor 25a or 25b via the signal connector receiver 12 to which the connector 6 is connected. Further, a clock for driving the solid-state imaging device is applied to each of the solid-state imaging devices 18 or 22 from the driver 26a or 26b of the video processor 25a or 25b.

A scope other than the fiber scope 2E has a type signal generating circuit 27 for outputting a scope identification type signal.
A, 27B, 27C, and 27D are provided, and are identified by the identification circuit 28 in the control device 1a via the signal connector 6.

By the way, as shown in FIG. 5 (a), the inside of the control device 1a that can be connected to any of the scopes 2 is a light source unit 15a.
Light source device 15 comprising two sets of video processors 25a and 25
b and are stored.

In FIG. 1, the light source unit 15a of the light source device 15 has the light source on the optical path connecting the light source lamp 31 that emits white light and the incident end surface of the light guide 14 to which the illumination light can enter. A parallel light lens 36 that makes the illumination light emitted from the lamp 31 parallel light, a turret cassette 34 as a wavelength region selecting means that can select the wavelength region of the collimated illumination light, and a light source device 15 that is a surface sequential type. Electronic scope 2A
And a filter cassette 38 as a color separation means that is inserted when the frame sequential TV camera 8C is connected, and a condenser lens that collects the illumination light emitted from the filter cassette 38.
37 are arranged.

In FIG. 3 and FIG. 4, the rotary filter 33 is
It is a disk shape, and the color transmission filters 32R, 32G, 32 of three primary colors of red (R), green (G), and blue (B) are arranged in the circumferential direction of the plate surface.
B has a white light emitted from the light source lamp 31, red, green,
Illumination light having each wavelength of blue is emitted, which is suitable for the frame sequential electronic scope 2A and the frame sequential television camera 8C. The filter cassette 38 can be removed when the mosaic electronic scope 2B, the mosaic television camera 8D, and the fiberscope 2E are connected to the light source device 15 to emit white light suitable for each scope. .

A plurality of holes 47, 47 ... Are provided in the circumferential direction on the inner diameter side of the color transmission filters 32R, 32G, 32B for detecting the timing of reading the signal from the solid-state imaging device.

The rotary filter 33 is housed in a filter cassette 38, and the ball bearing 3 is located at the center of rotation of the rotary filter 33.
A rotary shaft 40, which is pivotally supported by 9, 39 and is provided at the center of the filter cassette 38, is provided.

The front plate 48 and the rear plate 49 of the filter cassette 38,
The windows 50, 50 are provided so that white light emitted from the light source lamp 31 can pass through the color transmission filters 32R, 32G, 32B. Furthermore, the front plate 48 and the rear plate 49 are provided with windows 53, 53 so as to face the timing detection holes 47,
For example, a light emitting element 74 is provided so as to face the hole 47 from one window 53, and a font sensor 75 is provided so as to face the hole 47 from the other window 53.

The front end surface of the rotary shaft 40 is provided with a hole 66 having grooves 51, 51 provided in the axial direction, and a window 67 is provided in the central portion of the front plate 48 so as to face the hole 66. It is provided.

Pins 69, 69 protruding in the radial direction are provided in the hole 66 so as to coincide with the groove portions 51, 51, and the drive shaft 68 of the rotary filter drive motor 70 supported by the slide bearing 72a is inserted. There is.

In front of the rotary filter driving motor 70, a substantially cylindrical attachment / detachment knob 73, which penetrates, for example, the front plate 71 of the control device 1a and is supported by a slide bearing 72b, is continuously provided.

Information such as the spectral intensity of the illumination light transmitted through the rotary filter 33 and the blanking period is stored in the filter cassette 38 for determining the type of filter, for example, by a combination of ROM (read only memory) and contacts. The filter type recording unit 83 is provided and is connected to the contact 84 provided on the side surface of the filter cassette 38.

As shown in FIG. 2, the filter cassette 38 is inserted, for example, by an opening 78 provided in a top plate 77 of the control device 1a and positioned by positioning pins 79, 79 provided on a side plate 86 of the filter cassette 38. It has become so.
After positioning, the attachment / detachment nozzle 73 is pushed toward the controller 1a to drive the drive shaft 68 of the rotary filter drive motor 70.
Is a hole provided in the rotary shaft 40 that supports the rotary filter 33.
It is inserted in 66 and is connected so that rotation can be transmitted.

The contact 84 of the filter type recording unit 83 is adapted to be connected to the timing generator 52 in the control device 1a at the same time when the filter cassette 38 is positioned,
The type and characteristics of the inserted rotary filter 33 are transmitted to the timing generator 52, and signals matching this are sent to the frame sequential process circuit 41a, the mosaic process circuit 41b, the drivers 26a and 26b, the output circuit 80, and the driver 116. It can be output.

The driver 116 drives the rotary filter drive motor 70 by a synchronizing signal, which is suitable for the rotary filter 33 from the timing generator 52.

The font sensor 75 synchronizes the timing of the clock of the timing generator 52 with the rotation of the rotary filter 33, and the output of the timing generator 52 controls the timing of the frame sequential process circuit 41a.

In the turret cassette 34, a disc-shaped turret plate 91 is provided such that a shaft 92 provided at the rotation center of the turret plate 91 is pivotally supported. On this turret plate 91, a neutral density filter (ND filter) 94 having a dimming effect of an infrared cut filter 93 formed in a fan shape in the circumferential direction, a special light observation filter 96 for selecting a wavelength region of illumination light, and an opening. And part 97.

The infrared cut filter 93 is the filter cassette.
When 38 is attached, it is used to remove the infrared component contained in the illumination light. Further, the special observation filter 96 is designed to be able to transmit a wavelength band in which the absorbance remarkably changes depending on the amount of hemoglobin in the blood or the oxygen saturation, and is used when performing special light observation. It is like this. In addition, the opening
Reference numeral 97 is used when the filter cassette 38 is removed, that is, when the color mosaic electronic scope 2B, the color mosaic television camera 8D, and the fiberscope 2E are connected.

A plurality of claws 98, 98 ... Are projectingly provided on the outer periphery of the turret plate 91 so that they can come into contact with the projections 102 inserted from the slits 101 provided in the bottom plate 99 of the turret cassette 34. . As shown in FIG. 2, the turret cassette 34 is inserted through an opening 103 provided in a top plate 77 forming the housing 29 of the control device 1a, and the projection 102 is projected into the turret cassette 34 by inserting the turret cassette 34. It has become so.

The protrusion 102 is a pin that is projected and retracted by the solenoid 105.
The pin 108 is provided at the tip of the turret plate 91 so that the protrusion 102 presses the claw 98 in the tangential direction of the turret plate 91 to rotate the turret plate 91.

In FIG. 5A, the solenoid 105 is controlled by the turret control circuit 104, and by operating a turret rotation switch provided on the front plate 71 (not shown), for example, the turret control circuit 104.
Is designed to operate the solenoid 105. A light emitting diode 106 and a photo sensor 107 are provided near the turret cassette 34 so that the angle rotated by the solenoid 105 can be detected, and the detected angle is input to the turret control circuit 104 and designated. The filtered filter is inserted in the optical path.

Meanwhile, the one video processor 25a is for frame sequential signal processing, the signal input to the signal input terminal of the frame sequential signal connector receiver 12 is input to the frame sequential process circuit 41a, The signals imaged under the illumination lights of R, G, and B wavelengths are output as color signals R, G, and B, respectively. These color signals R, G, B are output to the output circuit 8
According to 0, it is output as the three primary color signal GB from the three primary color output terminal 43. The color signals R, G, and B are converted into a composite video signal of the NTSC system and output from an NTSC output terminal 46.

The frame sequential process circuit 41a is configured, for example, as shown in FIG.

That is, the signal input through the preamplifier is input to the sample and hold circuit 54, sampled and held, corrected for γ by the γ correction circuit 55, and converted to a digital signal by the A / D converter 56. A multiplexer 57 switched by the signal of the timing generator 52
The signal imaged under R, G, B field sequential illumination through
The data is written to the R frame memory 58R, the G frame memory 58G, and the B frame memory 58B. Each of these frame memories 58
The signal data written to R, 58G, 58B is read out at the same time,
Each is converted into analog color signals R, G, B by the D / A converter 59 and output to the output circuit 80.

On the other hand, the solid-state image sensor 18 of the color mosaic electronic scope 2B and the mosaic type fiberscope 2E with an external camera 18
Alternatively, the signal captured at 22 is input to the color mosaic process circuit 41b, where the luminance signal Y and the color difference signals R-Y, B-
Y is output. Then, this signal is input to the output circuit 80, converted into an NTSC composite video signal, and output from the NTSC output terminal 46. The luminance signal Y and the color difference signals RY and BY are converted into color signals R, G and B by the output circuit 80, and a three primary color signal RGB is output from a three primary color signal output terminal 43.

The color mosaic type process circuit 41b is configured, for example, as shown in FIG.

That is, the solid-state imaging device 18 amplified by the preamplifier 24
Alternatively, the signal from 22 passes through a luminance signal processing circuit 61 to generate a luminance signal Y. Further, the color difference signals R-Y and B-Y are input to a color signal reproduction circuit 62 in a time-series manner for each horizontal line, and the white balance is compensated by a white balance circuit 63. The other is delayed by one horizontal line by a 1H delay line 63a and input to an analog switch 64a, and a color difference signal RY, BY is obtained by a switching signal of a timing generator 52.

The timing generator 52 is a driver
Signals are applied to 26a, 26b and an NTSC encoder (not shown), and control is performed so that signal processing synchronized with a drive pulse used for signal reading from the solid-state imaging device 18 or 22 is performed. In this case, in the frame sequential video processor 25a,
As described above, the timing generator 52 is synchronized with the rotary filter 33 by the output of the photo sensor 75.

By the way, the type signal generation circuits 27A, 27B, 27C, 27D
For example, it is formed by connecting resistors having different resistance values between the two terminals, while the identification circuit 28 uses a comparator or the like for the resistance value between the two terminals to determine whether a scope having a resistance value is connected. To be able to identify.

The identification circuit 28 controls switching of the changeover switch 103 in addition to controlling both the drivers 26a and 26b. For example, when the plane-sequential scope 2A or 2C is connected, switching is performed in a plane-sequential manner, and a driving pulse of a driver 26a is applied to the solid-state imaging device 18 via a connector, and a signal read from the solid-state imaging device 18 Is input to the frame sequential process circuit 41a.

On the other hand, if the field sequential scopes 2A and 2C are not connected,
The mosaic type process circuit side is selected. Note that the case of the mosaic type scope 2B or 2D may be detected, and the changeover switch 103 may be switched to the mosaic type side.

The identification circuit 28 also sends a control signal to the timing grenator 52 so that either method can be dealt with.

Further, as shown in FIG. 11, the output circuit 80 is provided with a three-circuit, two-contact changeover switch 81 between the output end of the matrix circuit 44a and the NTSC encoder 45, and the output end of the inverse matrix circuit 44b and the driver. A three-circuit, two-contact changeover switch 82 is also provided between it and the buffer 42 to be formed.

When one of the contacts is turned on, the changeover switch 81 guides the signal of the matrix circuit 44a to the common NTSC encoder 45, converts the signal into an NTSC video signal by the NTSC encoder 45, and outputs the signal from the common NTSC output terminal 46. I do. When the other contact side is selected, the mosaic process circuit 41 is selected.
b signal to the NTSC encoder 45, the common NTSC output 4
Output from 6.

On the other hand, as for the other changeover switch 82, when the field sequential type is selected, the output signal of the field sequential type process circuit 41a passes through a common buffer 42 forming a driver to a common RG.
The three primary color signals are output from the B output terminal 43. When the mosaic process circuit is selected, the inverse matrix circuit
The three primary color signals R, G, B passed through 44b are output from a common RGB output terminal 43.

Each of the changeover switches 81 and 82 can be manually switched, or can be switched in conjunction with each other.

The filter provided in the turret cassette 34 may be a filter for attenuating the peak of the bright line spectrum having high coherence contained in the light emitted from the light source lamp 31, or for removing the bright line spectrum.

According to this embodiment, a filter provided in the turret cassette 34 is selectively inserted in the optical path of the illumination light to remove the infrared component, reduce the illumination light, and perform a special observation in a wavelength range. Can be transmitted. Furthermore, by removing the turret cassette 34 and inserting a turret cassette provided with a filter capable of transmitting other wavelength regions, a wealth of information necessary for diagnosis and the like can be obtained.

 FIG. 12 shows a second embodiment of the present invention.

In this embodiment, the rotation of the filter plate 109 is performed by a rotary motor.

Inside the turret cassette 34 is a disc-shaped turret plate.
109 is the shaft provided at the center of rotation of this turret plate 109.
11 is provided so as to be pivotally supported. A gear 112 is engraved on the outer peripheral surface of the turret plate 109, and a gear 113 inserted through a slit 101 provided on the bottom plate 99 of the turret cassette 34 is meshed with the gear 112. . The gear 113 is rotated by a motor 114 provided on the light source device 15 side, and the rotation of the motor 114 is controlled by the turret control circuit 104.

Other configurations, operations and effects are the same as those of the first embodiment.

13 to 17 relate to a third embodiment of the present invention,
13 is an illustration of a turret plate, FIG. 14 is an illustration of a turret plate provided with a mesh filter on the concentric plate, FIG. 15 is an illustration of a turret plate provided with concentrically different thin films.
FIG. 16 is an explanatory view of a removable filter, and FIG. 17 is a sectional view taken along the line BB ′ of FIG.

In this embodiment, the turret plate 109 is provided with a mesh filter as a neutral density filter.

In FIG. 13, a turret plate 109 rotatably provided in a turret cassette (not shown) is formed in a disc shape. A transparent glass 142 that does not limit the wavelength region of transmitted light is detachably provided in the circumferential direction of the turret plate 109, and a first light amount adjustment filter 144 formed by, for example, a 1/4 mesh net 143. , A neutral density filter having a dimming effect (ND filter 146, infrared cut filter 147, second light amount adjustment filter 149 formed by, for example, a 1/2 mesh net 148, and the wavelength range of transmitted light is not limited. The transparent glass 151 is fixed.

On the inner diameter side of the filters 142, 144, 146, 147, 149, 151, a plurality of position detection marks 152 are further provided concentrically, and the position detection marks 152 are inserted in the optical path of the illumination light by reading them with a position detection sensor (not shown). The filter can be detected.

Further, as shown in FIG. 14, a turret plate 153 is formed by arranging a transparent glass 154 that does not limit the wavelength range of transmitted light and a mesh 156 of, for example, 1/2 mesh, concentrically, and the center of rotation of the turret plate 153. Direction orthogonal to the optical path of the illumination light,
That is, the amount of illumination light may be adjusted by moving the turret plate 153 in the radial direction.

Further, as shown in FIG. 15, a plurality of thin films 158, 159 and 161 having different transmittances may be formed concentrically on the surface of the disc-shaped turret plate 157 so that the turret plate 157 can be moved in the radial direction.

Note that a plurality of thin films having different transmittances may be radially provided and the turret plate may be rotated around the rotation center line.

Furthermore, the filter disk shape provided in the filter cassette used with the turret cassette may be a short wavelength filter instead of the frame sequential type.

The removable plain filter 142 has the structure shown in FIGS. 16 and 17.

The disk-shaped turret plate 109 is provided with an arcuate notch 166 at the peripheral edge thereof, and the turret plate 109 is also provided.
A fixing means, for example, a base end portion of a leaf spring 167 is attached to one surface of the. Further, a V-shaped locking claw portion 168 is bent at the tip of the leaf spring 167, and the locking claw portion 1 is formed.
68 faces the rear end of the cutout 166. A filter frame 169 is detachably attached to the cutout portion 166 by the leaf spring 167, that is, the filter frame 169 is formed in an annular shape, and the cutout portion is formed on the outer peripheral surface thereof. Engagement groove 171 engageable with the inner peripheral edge of 166
Is provided. Further, annular grooves 170, 170 are concentrically formed on both side surfaces of the filter frame 169.
70 and 170 are V-shaped in cross section so that the filter frame 169 is engaged with the locking claw portion 168 of the leaf spring 167 inserted into the cutout portion 166. Further, a filter mounting step 172 and an internal thread 173 are provided on the inner peripheral surface of the filter frame 169. And
A filter 142 is attached to the filter mounting step portion 172, and the filter 142 is a tightening ring screwed to the female screw portion 173.
It is fixed by 174.

To replace the filter 142, when the filter frame 169 is pulled in the direction of the arrow X shown in FIG. 16, the leaf spring 167 engaging with the grooves 170, 170 of the filter frame 169 is elastically deformed and the engaging claw portion 168 has the groove 17 formed.
The filter frame 169 can be removed from the turret plate 109 by moving it away from 0. In addition, the filter frame 169 is attached to the turret plate 1
When the filter frame 169 is attached to the filter frame 169, the engaging groove 171 of the filter frame 169 is opposed to the inner peripheral edge of the cutout portion 166 and is pushed in the direction of the arrow Y shown in FIG. Part 166
When it is inserted in a state of being engaged with the inner peripheral edge of and is inserted to a predetermined position, the locking claw portion 168 of the leaf spring 167 is dropped and locked and fixed in the grooves 170, 170. Therefore, the filter used in advance
By preparing the filter frame 169 to which the 142 is attached, the filter frame 169 can be selectively attached to the starlet plate 109 by various filter frames 169, and the filter 142 can be easily replaced. Moreover, in this case, the filter frame 16
Since the grooves 170, 170 are provided on both side surfaces of 9, the filter frame 169 can be installed even if the front and back are reversed when the filter frame 169 is inserted into the starlet plate 109.
Since the filter frame 169 is inserted concentrically into the cutout portion 166 in any direction, the filter frame 169 can be engaged with the engagement claw portion 168 of the leaf spring 167.

Other configurations, operations and effects are the same as those of the first embodiment.

In each of the above embodiments, the filter cassette and the turret cassette are provided separately, but they may be inserted and removed as a unit.

[Effects of the Invention] As described above, according to the present invention, an illumination suitable for a scope having a frame sequential imaging means, a scope having a color mosaic imaging means, and a fiber observable fiberscope. In addition to being able to supply light, illumination light suitable for special light observation can be supplied.

[Brief description of the drawings]

1 to 11 relate to the first embodiment, FIG. 1 is a perspective view showing a configuration of a light source unit, FIG. 2 is a perspective view of an endoscope control device, and FIG. 3 is a configuration of a rotary filter. A sectional view shown in FIG. 4, FIG. 4 is a sectional view taken along the line AA ′ in FIG. 3, FIG. 5 (a) is a block diagram showing the configuration of the endoscope apparatus, and FIG. 5 (b) is a color mosaic electronic scope. 6 is an explanatory view showing the structure of a fiber-scope with a frame-sequential external camera, FIG. 7 is an explanatory view showing the structure of a fiber-scope with a mosaic external camera, and FIG. FIG. 9 is an explanatory view showing the structure of a fiberscope, FIG. 9 is a block diagram showing the structure of a frame sequential process circuit, FIG. 10 is a block diagram showing the structure of a mosaic process circuit, and FIG. 11 is a structure of the output circuit. The block diagram and FIG. 12 relate to the second embodiment of the present invention and show the configuration of the light source unit. FIG. 13 to FIG. 17 relate to a third embodiment of the present invention, FIG. 13 is an explanatory view of a turret plate, and FIG. 14 is an explanatory view of a turret plate having a concentric mesh filter, FIG. 15 is an explanatory view of a turret plate provided with a plurality of concentric thin films having different transmittances, FIG. 16 is an explanatory view of a removable filter, and FIG. 17 is a sectional view taken along line BB ′ of FIG. is there. 15a: Light source part, 31 ... Light source lamp 32R, 32G, 32B ... Color transmission filter 33 ... Rotation filter 34 ... Turret cassette 38 ... Filter cassette 93 ... Infrared cut filter 94 ... Neutral density filter 96 ...... Special light observation filter 97 …… Aperture

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Issei Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Inventor Takeaki Nakamura 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 Olympus Optical Co., Ltd. (72) Inventor Yoshinao Daimei 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Co., Ltd. (72) Hiromasa Suzuki 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 in Olympus Optical Co., Ltd. (56) Reference JP-A-63-234941 (JP, A)

Claims (1)

(57) [Claims] 1. A light source that emits white light as illumination light, and color lights having different wavelength regions that can be inserted and removed between the light source and a subject through an opening provided in an exterior plate in order. A first filter cassette having a transmitting rotary filter therein and a light source and a subject can be inserted into and removed from an opening provided in an exterior plate, and can be inserted in series with the first filter cassette. And a second filter cassette into which a filter capable of selectively transmitting at least light in a specific wavelength region can be selectively switched and inserted into an optical path connecting the light source and a subject. And a light source device for an endoscope.