JP2702144B2 - Light source device for endoscope - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device for an endoscope in which scopes having different imaging methods can be connected to the same light source.

[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 method of sequentially switching illumination light to R (red), G (green), B (blue), etc. With a sequential formula, for example, as shown in JP-A-60-76888,
There is a color mosaic type (also referred to as a simultaneous type) in which a filter array in which color filters transmitting R, G, B, and other color lights, respectively, are arranged in a mosaic pattern or the like on the front surface of a solid-state imaging device. 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 a color shift does not occur even for a subject with rapid movement.

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 reduction in resolution, for example, light of each wavelength of R, G, B is illuminated in a plane-sequential manner rather than a color mosaic type imaging method using a color mosaic filter. It is advantageous to use a frame-sequential color imaging method in which frame-sequential imaging is performed under the illumination, and these images are synthesized 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.

Incidentally, 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.

The illumination method differs between the fiber scope, the plane-sequential type electronic scope, and the color mosaic type electronic scope. That is, the fiberscope and the color mosaic type electronic scope require white light, and the plane-sequential type electronic scope requires light that sequentially switches to each of the plane-sequential colors such as R, G, and B. However, the conventional light source device can only output illumination light corresponding to one of a plane-sequential type electronic scope and a color mosaic type electronic scope or a fiber scope. , Prepare different light source devices,
Different operations had to be performed, and the economy and efficiency were poor.

Japanese Patent Application Laid-Open No. 60-243625 discloses that a fiber scope having an optical fiber bundle for image transmission is connected to a control device of an electronic scope having a plane sequential light source device to display on a monitor television or the like. A connection system that allows observation on a screen is disclosed. However, in this system, it is not possible to use a color mosaic-type electronic scope and to visually observe using a fiber scope.

[Object of the Invention] 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 for an endoscope to which scopes having different imaging methods can be connected.

[Means for Solving the Problems] A light source device for an endoscope according to the present invention comprises: a filter capable of sequentially transmitting each color light in a plane-sequential system; an optical path from a white light source passing through the filter; An optical path switching means for switching to an optical path for avoiding the light path, and an optical path for passing the filter or an optical path for avoiding the filter so that the light guide incident end face can be moved freely. And a light guide connecting means capable of operating the optical path switching means.

[Operation] In the present invention, the illumination light emitted from the white light source is switched by the optical path switching means to an optical path that passes through a filter that can sequentially transmit each color light of the field sequential method and an optical path that avoids the filter. The light guide connecting means capable of mounting the incident end face of the light guide for supplying illumination light to the endoscope is movable to an optical path passing through the filter and an optical path avoiding the filter. The movement causes the optical path switching means to operate.

Note that, in the present invention, a scope having a plane-sequential imaging means or a scope having a color mosaic imaging means is an electronic scope in which the imaging means is integrated, and an eyepiece of the scope. In which an imaging means is detachably provided.

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

FIGS. 1 to 10 relate to a first embodiment of the present invention. FIG. 1 (a) is an explanatory view showing a configuration of a light source device in a state where surface-sequential illumination light is emitted, and FIG. 1 (b) is white. FIG. 2 is an explanatory diagram showing a configuration of a light source connecting device in an emission state of illumination light, FIG. 2 is a block diagram showing a configuration of an endoscope device, FIG. 3 is an explanatory diagram showing a configuration of a color mosaic type electronic scope, FIG. Is an explanatory view showing the configuration of a fiber-sequential fiberscope with an external camera, FIG. 5 is an explanatory view showing the configuration of a mosaic-type external fiberscope with a camera, FIG. 6 is an explanatory view showing the configuration of a fiberscope, FIG. 7 is a perspective view showing the entire system of the endoscope apparatus, FIG. 8 is a block diagram showing a configuration of a frame sequential process circuit, FIG. 9 is a block diagram showing a configuration of a mosaic process circuit, and FIG. FIG. 3 is an explanatory diagram illustrating a configuration of an output circuit.

As shown in FIG. 7, the endoscope device 1 houses a light source device and a video processor that performs video signal processing, and can use any of various scopes (endoscopes) 2A, 2B, 2C, 2D, and 2E. And a control device 1a that can also be connected. 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 includes an elongated insertion section 3 and an operation section 4 connected to the rear end of the insertion section 3.
The universal cord 4a extends from the operation unit 4, and the light source connectors 5A, 5B, 5C, 5D, and 5E are provided at the tip of the universal cord 4a. Each of the light source connectors 5A, 5B, 5C, 5D, and 5E includes a light guide connector 151 and an air / water connector 152. In the surface sequential electronic scope 2A and the color mosaic electronic scope 2B, the distal end of the universal cord 4a is branched, and signal connectors 6A and 6B are provided at the distal end. The fiberscope 2C with a frame sequential television camera and the fiberscope 2D with a color mosaic television camera have a configuration in which a frame sequential television camera 8C and a color mosaic television camera 8D are attached to the eyepiece 7 of the fiberscope 2E. And signal connectors 6C, 6 at the ends of the signal cables extended from the respective TV cameras 8C, 8D.
D is 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). ; Control device so that each scope 2 can be set to a usable state by connecting 5E
1a For example, on the front of the housing,
A light source connector receiver 11 as light guide connecting means is provided on a slide plate 12 which can slide on the front surface of the housing. The position of the light source connector receiver 11 can be moved by sliding a slide plate, and a position 11a for emitting each color light of a frame sequential method and a position 11b for emitting white light can be selected.

Further, the signal connector receiver 12 adjacent to the lower side of the light source connector receiver 11 has a shape capable of connecting the signal connectors 6A, 6B, 6C, 6D of the same scope 2 with the same shape.

When the fiber scope 2E is connected and used, it is a visual observation, but when other scopes 2A, 2B, 2C and 2D are used, the color monitor 13 connected to the signal output terminal of the control device 1a is used. Thus, a captured image can be displayed in color.

The interior of each of the scopes 2A, 2B, 2C, 2D, 2E is configured as shown in FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG.

In each of the scopes 2, a light guide 14 for transmitting illumination light is inserted, and the illumination light supplied to the incident end face of the light guide 14 from the light source unit 15 in the control device 1a is transmitted to the emission end face side. Light distribution lens placed in front of emission end face
After 16, the front subject side 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
In the imaging position of, in both the field-sequential or color mosaic electronic scopes 2A or 2B, a solid-state imaging device 18 such as a CCD is disposed, while the fiber scope 2E and the television camera 8C or 8D are mounted. In the fiberscope 2C or 2D with a television camera, the image guide 19 is disposed 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 imaging device 18 or 22 constituting the imaging unit photoelectrically converts the optical image formed on the imaging surface, amplifies the optical image with a preamplifier 24, and then passes the signal connector 6 (6) through a signal transmission line.
Represents A, 6B, 6C, 6D. ) Side, and this connector 6
Are input to the video processor 25a or 25b via the connected signal connector receiver 12. A clock signal for driving the solid-state imaging device is applied to each of the solid-state imaging devices 18 and 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. 2, in the control device 1a connectable with any of the scopes 2, as shown in FIG.
And two video processors 25a and 25b.

In FIG. 1, the light source unit 15 includes a white light source lamp 31 that emits white light. On the optical path above the light source lamp 31, there is provided a rotary filter 33 having color transmission filters of three primary colors of red (R), green (G) and blue (B) and driven to rotate by a motor 32. I have. The light source lamp 31,
Between the rotary filter 33, a rotating mirror 36 as an optical path switching means that can be interposed on the optical path and retracted from the optical path is disposed swingably around a pin 37, and is suspended vertically. It has been in a state where it was done. This rotating mirror 36
On the reflection surface side, a pin 40 is provided so as to project in a direction perpendicular to the reflection surface.

The light source connector receiver 11 is provided so as to be movable in the same direction as the emission optical path of the light source lamp 31, and a cam 38 is provided inside the light source unit 15 of the light source connector receiver 11. When the light source connector receiver 11 is lowered, the cam 38 comes into contact with the pin 40. When the cam 38 is further lowered and moved to a position 11b for supplying white light, that is, a position coincident with the optical axis 35, FIG. As described above, the rotating mirror 36 is interposed on the emission optical path of the light source lamp 31.

As shown in FIG. 1A, when the rotary mirror 36 is retracted from the optical path of the light source lamp 31, white light emitted from the light source lamp 31 passes through the rotary filter 33. ing.

A fixed mirror 39 is provided on the optical path of the light transmitted through the rotation filter 33. The fixed mirror 39 reflects light in a direction substantially parallel to the optical path of the light reflected by the rotating mirror 36.

On the reflection optical path of the fixed mirror 39, a condenser lens 34a
Is disposed on the optical path in front of the condensing lens 34a, at a position 11a at which the color light of each of the above-described plane-sequential types can be emitted. A light guide connector receiver 11 to which the connectors 5A and 5C are connected is provided.

The plane-sequential illumination light that has passed through the rotary filter 33 and has been sequentially converted into light of each wavelength of R, G, and B is condensed by the condenser lens 34a and connected to the light guide connector receiver 11 in a plane-sequential manner. The light is incident on the incident end face of the light guide 14 of the scopes 2A and 2C.

On the other hand, as shown in FIG. 1 (b), a condensing lens is provided on the reflection optical path of the rotating mirror 36 interposed on the optical path of the light source lamp 31.
34b is provided, and on the optical path in front of the condenser lens 34b,
The light source connector receiver 11 is moved to a position 11b where the white light can be supplied, that is, a position coinciding with the optical axis 35. Then, the white illumination light that has bypassed the rotation filter 33 is collected by the condenser lens 34b, and the mosaic scopes 2B and 2D connected to the light source connector receiver 11,
Alternatively, the light is incident on the incident end face of the light guide 14 of the fiberscope 2E.

By the way, the video processor 25a is for frame-sequential signal processing, and the signal input to the signal input terminal of the frame-sequential signal connector receiver 12 is input to the frame-sequential processor circuit 41a. , G, and B, and output signals respectively captured by illumination light of each wavelength as color signals R, G, and B. The respective color signals R, G, B are output from the output circuit 80.
As a result, a three primary color signal RGB is output 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.

A rotation position sensor 51 for detecting a rotation position is provided at one location on the outer periphery of the rotation filter 33. The output of the rotation position sensor 51 determines the clock timing of the timing generator 52 to rotate the rotation filter 33. The output of the timing generator 52 controls the timing of the frame sequential process circuit 41a.

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 type electronic scope 2B and the fiber mosaic type
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.

Note that the color mosaic 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,
The timing generator 52 is synchronized with the rotation filter 33 by the output of the position sensor 51.

By the way, the type signal generation circuits 27A, 27B, 27C, 27D
For example, the resistance circuit is formed by connecting resistors having different resistance values between two terminals. On the other hand, the identification circuit 28 determines the resistance value between the two terminals by using a comparator or the like to determine which resistance scope was connected. Are identified.

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 type scope 2A or 2C is connected, switching is performed to the plane-sequential side, the driving pulse of the driver 26a is applied to the solid-state imaging device 18 via the connector, and the signal read from the solid-state imaging device 18 is It 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. With this configuration, it can be used also as a light source of a fiberscope. 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 generator 52 so that it can deal with any of the methods.

As shown in FIG. 10, the output circuit 80 is provided with a three-circuit, two-contact switch 81 between the output terminal of the matrix circuit 44a and the NTSC encoder 45, and connects the output terminal of the inverse matrix circuit 44b to the driver. A three-circuit, two-contact changeover switch 82 is also provided between 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 are output from a common RGB output terminal 43 via 44b.

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

Thus, in the present embodiment, a common light source lamp 31 is provided for all the scopes 2 in the control device 1a,
The plane-sequential scopes 2A and 2C, the mosaic scopes 2B and 2D, and the fiber scope 2E can be connected to the same light source lamp 31.

FIGS. 11 (a) and 11 (b) relate to a second embodiment of the present invention, and FIG. 11 (a) is an explanatory view showing the configuration of a light source device in a state where plane-sequential illumination light is emitted. FIG. 2B is an explanatory diagram showing a configuration of the light source device in a state where white illumination light is emitted.

In the light source unit 15 of the present embodiment, when the light source connector receiver 11 is moved, the light source lamp 31 is also moved at the same time.

In FIG. 11 (a), a light source capable of emitting white light in front of the incident end face of the light guide 14 of the light source connector receiver 11 as a light guide connection means moved to a position 11a capable of supplying field sequential illumination light. A lamp 31 is provided. On the optical path connecting the incident end face and the light source lamp 31, there are three primary color transmission filters of red (R), green (G), and blue (B), which are rotated by a motor 32. A driven rotary filter 33 is provided. Further, between the rotary filter 33 and the incident end face, there is provided a condenser lens 34a that can transmit each color light through the color transmission filter. The light source lamp 31,
For example, when the light source connector receiver 11 moves on the two rails 66, 66 to a position 11b where white light can be supplied, that is, a position coincident with the optical axis 67, the light source connector receiver 11 moves to a position where illumination light can enter the light guide 14. I can do it.

In FIG. 11 (b), the light source portion of the light source connector receiver 11 moved to the position where white light can be supplied, that is, the optical axis 67.
An on / off switch 68 is provided inside 15 and the on / off switch 68 is turned on by an end of the light source connector receiver 11. The on / off switch 68 outputs an on signal. The movement control circuit 69 is connected so as to be inputted to a movement control circuit 69 as an optical path switching means.
When this signal is input, the light source lamp 31 is moved to a position coincident with the optical axis 67. The white light emitted from the light source lamp 31 is condensed by the condenser lens 34b, and is irradiated on the incident end face of the light guide 14.

Note that the movement control circuit 69 moves the light source lamp 31 to the position 11a where the light can be supplied in a plane-sequential manner when the ON signal from the ON / OFF switch 68 is not input.

When connecting the field sequential scopes 2A and 2C to the control device 1a configured as described above, the light source connector receiver 11 is moved to a position 11a capable of supplying the field sequential light, and the light source connectors 5A and 5C are moved. Connecting. The light source lamp 31 has a movement control circuit 69
The illumination light that has been moved by the color transmission filter and is converted into each color light by the color transmission filter is condensed by the condenser lens 34a and is incident on the incident end face of the light guide 14. When connecting the mosaic scopes 2B, 2D or the fiber scope 2E, the light source connector receiver 11 can supply white light,
That is, it moves to a position coinciding with the optical axis 67. Light source lamp
31 is an on / off switch 68 by a movement control circuit 69.
The light source lamp 31 is moved by the input of the ON signal. The light emitted from the light source lamp 31 is condensed by the condenser lens 34b and is incident on the incident end face of the light guide 14.

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

12 and 13 relate to a third embodiment of the present invention.
FIG. 12 (a) is an explanatory diagram showing the configuration of the light source device in a state of emitting the surface-sequential illumination light, FIG. 12 (b) is an explanatory diagram showing the configuration of the light source device in an emitting state of the white illumination light, and FIG. FIG. 3 is an explanatory diagram of a light source unit in which a rotary filter is interposed between a light guide entrance end face and a condenser lens.

The light source device according to the present embodiment switches between an optical path passing through a rotary filter and an optical path avoiding the rotary filter by a mirror that is rotated by power.

In FIG. 12 (a), a light source capable of emitting white light in front of the incident end face of the light guide 14 of the light source connector receiver 11 as a light guide connecting means moved to a position 11a capable of supplying field sequential illumination light. A lamp 31 is provided. On the optical path connecting the incident end face and the light source lamp 31, there are three primary color transmission filters of red (R), green (G), and blue (B), which are rotated by a motor 32. A driven rotary filter 33 is provided. Further, a condenser lens 34a capable of condensing each color light transmitted through the color transmission filter is provided between the rotation filter 33 and the incident end face. Also, the rotation filter 33
A rotating mirror 72 as an optical path switching means that can be interposed on the optical path of the light source lamp 31 by being rotated by the motor 71 and retracted from the optical path is disposed between the light source lamp 31 and the light source lamp 31.

When the rotating mirror 72 is interposed on the optical path of the light source lamp 31, the white light emitted from the light source lamp 31 is substantially vertically reflected by the rotating mirror 72 and does not pass through the rotating filter 33. ing. The rotating mirror
A fixed mirror 73 is provided on the optical path of the light reflected by 72. The fixed mirror 73 reflects the light reflected by the rotating mirror 72 on an optical axis 74 that is substantially parallel to the optical path passing through the rotating filter 33, and that matches the position 11b where white light can be supplied. Has become.

In FIG. 12 (b), the light source section of the light source connector receiver 11 moved to the position where white light can be supplied, that is, the optical axis 74.
An on / off switch 68 is provided inside 15, and the on / off switch 68 is turned on by an end of the light source connector receiver 11. The ON / OFF switch 68 is connected so as to input an ON signal to a driving circuit 75. The driving circuit 75 rotates the motor 71 by receiving the signal, thereby turning the rotating mirror 72 to the light source lamp 31.
To be interposed on the optical path.

The drive circuit 75 retracts the rotating mirror 72 from the optical path of the light source lamp 31 when the ON signal from the ON / OFF switch 68 is not input.

When connecting the field sequential scopes 2A and 2C to the control device 1a configured as described above, the light source connector receiver 11 is moved to a position 11a capable of supplying the field sequential light, and the light source connectors 5A and 5C are moved. Connecting. The rotating mirror 72 is retracted from the optical path of the light source lamp 31 by the driving circuit 75, and the white light emitted from the light source lamp 31 is converted into each color light by a color transmission filter, and then condensed by the condensing lens 34a to be a light guide. It is incident on the 14 incident end face. When connecting the mosaic scopes 2B, 2D or the fiber scope 2E, the light source connector receiver 11 can supply white light,
That is, it moves to a position coinciding with the optical axis 74. Rotating mirror
Reference numeral 72 is provided in the optical path by a motor 71. Light source lamp 31
Is reflected by the rotating mirror 72 and the fixed mirror 73, is condensed by the condenser lens 34b, and is incident on the incident end face of the light guide 14.

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

In addition, as shown in FIG. 13, in order to reduce the outer diameter of the rotary filter 33, the incident end face of the light guide 14 and the condenser lens 34a
And a rotary filter 33 may be interposed between them.

In FIG. 13, the light source unit 15 includes a light source lamp 31 that emits white light. The emission direction of the light source lamp 31 includes a heat ray cut filter 76 that cuts off heat rays such as infrared rays, a diaphragm 78 driven by a rotary solenoid 77 that can adjust the amount of white light, and a rotary solenoid 86 similarly.
And a condenser lens 34a that collects white light emitted from the light source lamp 31 and passing through the heat ray cut filter 76, the aperture 78, and the shutter 87. The illumination light condensed by the condenser lens 34a is incident on the incident end face of the light guide 14. Condensing lens 34a
Between the light guide 14 and the entrance end face of the light guide 14.
A rotary filter having three primary color transmission filters of red (R), green (G), and blue (B) through which the illumination light collected by the filter 32 can be transmitted.
33 are provided.

Since the illumination light transmitted through the color transmission filter is condensed by the condenser lens 34a, the size of the color transmission filter can be reduced, and therefore, the outer diameter of the rotation filter 33 can be reduced. it can.

[Effects of the Invention] As described above, according to the present invention, it is possible to connect scopes having different imaging systems such as a frame sequential scope, a mosaic scope, and a fiber scope, and to exchange a light source device depending on a difference in the imaging system of a scope to be used. The operability can be improved because the operation is not performed.

[Brief description of the drawings]

1 to 10 relate to a first embodiment of the present invention.
FIG. 1A is an explanatory diagram showing a configuration of a light source device in a state of emitting a frame sequential illumination light, FIG. 1B is an explanatory diagram showing a configuration of a light source device in an emitting state of a white illumination light, and FIG. FIG. 3 is a block diagram showing a configuration of an endoscope apparatus, FIG. 3 is an explanatory diagram showing a configuration of a color mosaic electronic scope, FIG. 4 is an explanatory diagram showing a configuration of a frame sequential type fiberscope with an external camera, and FIG. FIG. 6 is an explanatory view showing the configuration of a fiberscope with a mosaic-type external camera, FIG. 6 is an explanatory view showing the configuration of the fiberscope, FIG. 7 is a perspective view showing the entire system of the endoscope apparatus, and FIG. FIG. 9 is a block diagram showing a configuration of a mosaic process circuit, FIG. 10 is an explanatory diagram showing a configuration of an output circuit, FIGS. 11 (a) and 11 (b). ) Is the second of the present invention.
11 (a) is an explanatory view showing the configuration of the light source device in a state of emitting the surface-sequential illumination light, and FIG. 11 (b) is an illustration showing the configuration of the light source device in an emitting state of white illumination light. FIGS. 12, 13 and 13 relate to a third embodiment of the present invention. FIG. 12 (a) is an explanatory view showing the configuration of the light source device in a state of emitting the frame sequential illumination light, and FIG. 12 (b). Is an explanatory diagram showing a configuration of the light source device in a state where white illumination light is emitted, and FIG.
The figure is an explanatory view of a light source unit in which a rotary filter is interposed between a light guide entrance end face and a condenser lens. 11 Connector receiver for light source 15 Light source unit 31, Light source lamp 32 Motor 33 Rotating filter 34a, 34b Condensing lens 36 Rotating mirror 38 Cam 39 Fixed Mirror, 40 ... pin

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takeaki Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside O-Limpus Optical Industrial Co., Ltd. (72) Inventor Yuji Ikuno 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. O Olympus Optical Co., Ltd. (72) Inventor Toshiaki Nishikori 2-43-2 Hatagaya, Shibuya-ku, Tokyo O-limpus Optical Co., Ltd. (72) Inventor Akihiko Miyazaki 2-43-2 Hatagaya, Shibuya-ku, Tokyo No. Olympus Optical Co., Ltd.

Claims (1)

(57) [Claims] An optical path switching means for switching an optical path from a white light source to an optical path passing through the filter and an optical path bypassing the filter; and a filter passing the filter. A light guide that allows the light guide entrance end face to move freely to an optical path that bypasses the filter, or a light guide that can operate the optical path switching means by moving the light guide entrance end face. A light source device for an endoscope, comprising: connecting means.