JPS63281117A - Light source device for endoscope - Google Patents

Abstract

PURPOSE:To eliminate the need of each different kind of light source device of a scope, and different operations, and to improve the profitability and the efficiency by providing an optical system which can select an optical path for reaching an object, after having transmitted through a color filter, and an optical path for reaching the object, without transmitting through the color filter. CONSTITUTION:A discriminating circuit 28 not only controls both drivers 26a, 26b but also controls switching of a changeover switch 103. For instance, when a face sequential scope 2A or 2C is connected, the switch is switched to the face sequential side, a driving pulse of the driver 26a is applied to a solid-state image pickup element 18 through a connector, and also, a signal which has been read out of the solid-state image pickup element 18 is inputted to a face sequential process circuit 41a. On the other hand, when the face sequential scopes 2A, 2C are not connected, a mosaic type process circuit side is selected, and can be used as a light source of a fiber scope, as well. In such a way, an illuminating light conforming to a scope provided with a face sequential type or a color mosaic type, and a fiber scope being capable of a visual observation can be supplied, and the efficiency can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides illumination light suitable for a scope equipped with a field-sequential imaging means, a scope equipped with a color mosaic imaging means, and a fiberscope. The present invention relates to a light source device for an endoscope that can supply light.

[Problems to be solved by conventional techniques and inventions] In recent years,
An endoscope (endoscope) that allows you to observe internal organs, etc. in a body cavity by inserting an elongated insertion part into a body cavity, and perform various therapeutic procedures as necessary using a treatment instrument inserted into a treatment instrument channel.
Also called scope or fiber scope. ) is widely used.

In addition, 11 solid-state image sensors such as charge-coupled devices (CODs)
Various electronic scopes used as one means have also been proposed. This electronic scope has advantages such as higher resolution than a fiber scope, easier recording and reproduction of images, and easier image processing such as enlarging images and comparing two images.

The color image transport method of the electronic scope involves sequentially switching the illumination light to R (red), G (green), B (blue), etc., as shown in, for example, Japanese Patent Laid-Open No. 61-82731. For example, as shown in Japanese Patent Application Laid-open No. 60-76888, there are filters in which color filters that transmit color lights such as R, G, and B are arranged in a mosaic pattern on the front surface of a solid-state imaging element. There is a color mosaic type (also called simultaneous time) in which an array is provided. The field sequential method has the advantage that the number of pixels can be reduced by one compared to the color mosaic method.
On the other hand, the color mosaic method has the advantage that color shift does not occur even for subjects that move rapidly.

Further, the electronic scopes are diversified depending on the purpose of use. For example, for upper or lower gastrointestinal use,
The outer diameter of the insertion portion is approximately 10φ.

On the other hand, for example, for use in the bronchus, an outer diameter of around 5φM or less is usually required. As described above, it is physically and performance-wise impossible to use the same type of image pickup element and the same type of image transport method for various electronic scopes with insertion portions having a wide range of outer diameters. That is, for example, in order to realize a bronchial (small diameter) electronic scope, it is necessary to use an imaging probe with a small number of pixels.

When the number of pixels is small like this, in order to prevent a decrease in resolution, it is better to use a sequential illumination method using light of each wavelength of R, G, and B, rather than a color mosaic imaging method using a color mosaic filter. However, it is advantageous to use a frame-sequential color imaging method in which images are captured sequentially under the illumination, and the images are combined and displayed in color.

On the other hand, for those with an outer diameter of around 10 φM, it is advantageous to increase the number of pixels and use a color mosaic imaging method in order to improve image quality.

Incidentally, the fiber scope or electronic scope is generally used by being connected to a light source device that supplies illumination light suitable for each scope.

The fiber scope, the field-sequential electronic scope, and the color mosaic electronic scope have different illumination methods.

That is, a fiber scope and a color mosaic type electronic scope require white light, and a field sequential type electronic scope requires light that can be sequentially switched to each color tone such as R, G, B, etc. in a field sequential manner.

However, conventional light source devices can only output illumination light compatible with either a field-sequential electronic scope, a color mosaic electronic scope, or a fiber scope. However, it was necessary to prepare different light source devices and perform different operations, which was poor in economy and efficiency.

In addition, Japanese Patent Application Laid-open No. 60-243625 discloses that a fiber scope equipped with an optical fiber bundle for image transmission is connected to a control device of an electronic scope equipped with a field-sequential light source device to display a display on a monitor television or the like. A connection system that allows viewing on a screen is disclosed. However, with this system, it is not possible to use a color mosaic type electronic scope or to perform naked eye observation using a fiber scope.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a scope equipped with a field-sequential image conveying means, a scope equipped with a color mosaic type lt3m means, and a fiber optic capable of visual observation. It is an object of the present invention to provide a light source device for an endoscope that can supply illumination light suitable for a scope.

[Means and effects for solving the problems] The present invention provides a light source that emits white light, a filter that sequentially transmits each color light in a field sequential system, and an optical path for the white light to pass through the filter and reach a subject. The endoscope light source V device consists of an optical system that can select the optical path that reaches the subject without passing through a filter, and can also output white light that is compatible with scopes and fiberscopes equipped with color mosaic imaging means. This is how it was done.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 1 to 9 relate to a first embodiment of the present invention.
Figure 1(a) is an explanatory diagram of the configuration of the light source device when emitting color light of G; tR, G, and B). Figure 1(b) is an explanatory diagram of the configuration of the light source device when emitting white light. , Fig. 2(a) is a block diagram showing the configuration of the endoscope device, Fig. 2(a) is an explanatory diagram without showing the configuration of the color mosaic type electronic scope, and Fig. 3 is a frame sequential type external attachment. Figure 4 is an explanatory diagram showing the configuration of a fiberscope with a camera, Figure 4 is an explanatory diagram showing the configuration of a fiberscope with a mosaic external camera, Figure 5 is an explanatory diagram of the configuration of the fiberscope, and Figure 6 is an explanatory diagram showing the configuration of a fiberscope with a camera. The figure is a perspective view showing the entire system of the endoscope device, FIG. 7 is a block diagram showing the structure of the field-sequential pro-his circuit, FIG. 8 is a block diagram showing the structure of the 71-Ike process circuit, and FIG. The figure is an explanatory diagram without showing the configuration of the output circuit.

As shown in FIG. 6, the endoscope device 1 houses the light source device of this embodiment and a video processor that performs video signal processing, and includes various scopes (endoscopes) 2A, 28.2C, 2
It is equipped with a control device 1a to which both D and 2E can be connected. There are five types of scopes as shown in the figure: Zunawara, a field-sequential electronic scope 2A, a color mosaic electronic scope 2B using a color mosaic filter, and a fiber scope with an external field-sequential TV camera ( There are 2C1 (hereinafter referred to as a fiberscope with a color mosaic television camera) 2C1 (hereinafter referred to as a fiberscope with a color mosaic television camera) 2D1 and a fiberscope 2E (hereinafter referred to as a fiberscope with a color mosaic television camera).

Each of the scopes 2A, 28.2G, 2D, and 2E has an elongated insertion section 3 and an operation section 4 connected to the rear end of the insertion section 3, and a universal cord 4a from the operation section 4. is extended, and light source connectors 5A, 5B, 5C, 50, and 5E are provided at the tip of this universal cord 4a. In addition, a field sequential electronic scope 2A,
In the color mosaic electronic scope 2B, a light source connector 5A is provided on the tip side of the universal cord 4a.

Signal connectors 6A and 6B are provided at the corner of 5B. In addition, fiberscope 2 with frame-sequential TV camera
C and the fiberscope 2D with a color mosaic TV camera have a field sequential TV camera 8C and a color mosaic TV camera 8 in the eyepiece 10 of the fiberscope 2E.
D, each TV camera 8c is installed.
, 8D, and signal connectors 6C and 6D are installed at the tips of the signal cables.

Each of the scopes 2A, 2B, 2C, 2D, 2E (hereinafter,
If it is common to all these scopes, it is represented by the symbol @2. ) connectors 5A, 6A:5B, 6B:5C,
For example, a pair of connector receivers are provided on the front side of the housing of the control device 2-1a so that the scopes 2 can be set in a usable state by connecting the scopes 6C:5D and 6D:5E.

These connector receivers consist of a light source connector receiver 11 and a signal connector receiver 12. The light source connector receiver 11 has a shape that allows connection of light source connectors 5A, 5B, 50.5D, and 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 the same shape as the signal connectors 6A and 6B of each scope 2.
, 60.6D can be connected to each other.

When the fiber scope 2E is connected and used, the observation is performed with the naked eye, but the other scope 2A is used.

When using 28.2G or 2D, the captured image can be displayed in color by the color monitor 13 connected to the signal output terminal of the control device 1a.

In addition, the light source connector 5Δ in each scope 2.

In this embodiment, the connectors 58, 50, 5D and 5E are provided with a light guide connector as well as an air/water supply connector (not shown), and the connector receiver 11 is also structured to be able to connect these.

The interior of each of the scopes 2A, 2B, 2G, 2D, and 2E is shown in FIGS. 2(a), 2(b), 3, and 4, respectively.
It is constructed as shown in FIG.

Each scope 2 is inserted with a light guide 14 that transmits illumination light, and transmits the illumination light supplied to the input end surface from the light source section 15a of the light source device 15 in the control device 1a to the output end surface side. The front subject side can be illuminated through a light distribution lens 16 placed in front of the end face.

Further, in each of the scopes 2, an objective lens 17 for imaging is disposed at the distal end of the insertion section 3. This objective lens 1
At the imaging position 7, a solid-state image sensor 18 such as a COD is disposed in the field-sequential type or color mosaic type scope 2A or 2B, and on the other hand, the fiber scope 2E or the television camera 8C or 8D is installed. The attached fiberscope 2C or 2D with a television camera is arranged so that the incident end face of the image guide 19 faces. Further, an eyepiece lens 21 is disposed opposite to the output end surface of the image guide 19, and a fiber scope 2
In E, TGL observation can be performed with the naked eye by bringing the eye close to the eyepiece section 7.

On the other hand, the eyepiece section 7 of the fiberscope 2E is equipped with a frame sequential type television camera 8C or a color mosaic type television camera 8.
In the case where D is attached, a solid-state image sensor 22 is disposed opposite to the eyepiece lens 21 via an imaging lens (not shown).

The solid-state image sensor 18 or 22 constituting the image carrier photoelectrically converts the optical image formed on the imaging surface, and the preamplifier 24
After being amplified by the signal transmission line, the signal is amplified by the signal connector 6 (6A, 6B, 6G).

Represents 6D. ) side, and is input to the video processor 25a or 25b via the signal connector receiver 12 to which this connector 6 is connected.

Furthermore, a clock signal for driving the solid-state image sensor is applied to each solid-state image sensor 18 or 22 from the driver 26a or 26b of the video processor 25a or 25b.

In addition, for scopes other than the fiberscope 2E, a type signal generation circuit 2 that outputs a type signal for scope identification is provided.
7A, 27B, 27C, and 27D are provided, and are identified by an identification circuit 28 in the control device 1a via the signal connector 6.

By the way, as shown in FIG. 2(a), the control vR unit 1, which can be connected to any of the scopes 2, includes a light source unit 1.
A light source device 15 consisting of a light source device 5a and two sets of video processors 25a and 25b are housed.

@The light distribution source section 15a is configured as shown in FIG. 1(a) and FIG. 1(b).

A first total reflection prism 34 and a fourth total reflection prism 38 are provided on the optical axis connecting the light source lamp 31 and the incident end surface of the light guide 14, and are perpendicular to the optical axis. , reflective surfaces are provided so that the light can be reflected in the same direction.

A second total reflection prism 36 is provided in the reflection direction of the first total reflection prism 34 so that the reflection direction of the second total reflection prism 36 is the same direction as the white light.

In the reflection direction of the fourth total reflection prism 38, a third total reflection prism 37 is arranged in a direction opposite to the second total reflection prism 36.
It is provided so that the reflected light of

Further, a rotary filter driving motor 32 is provided between the second total reflection prism 36 and the third total reflection prism 37.
Color transmitting filters 30 of three primary colors, red (R), green (G), and blue (B), are disposed in the circumferential direction of a disk-shaped rotating filter 33 that is driven by.

Further, a condenser lens 39 is provided between the fourth total reflection prism 38 and the incident end surface of the light guide 14 .

The first total reflection prism 34 and the fourth total reflection prism 38 are mounted on the movable motor 4 so that they can be retracted from the optical axis connecting the light source lamp 31 and the incident end surface of the light guide 14.
They are both held on top of a screw 47 that is screwed onto a pinion 49 provided on the drive shaft of No. 8.

By the way, the field sequential type electronic scope 2A and the field sequential type external connection are the light source connector 5A of the camera-equipped fiber scope 2C.
, 5C and signal connector 6A.

When 6C is connected, type signal generation circuit 27A.

Based on the signal from 27C, the identification circuit 28 determines which scope 2 is connected, and instructs the movement control circuit 66 to rotate the movement motor 48, for example, in the forward direction.

As a result, the first total reflection prism 34 and the fourth total reflection prism 38 provided at the upper part of the rack 47 protrude into the optical path from the light source lamp 31 to the condenser lens 39, and the light emitted from the light source lamp 31 is After passing through the first total reflection prism 34 and the second total reflection prism 36, R, G, and B are sequentially passed through the color transmission filter 30 provided on the rotary filter 33.
The illumination light has wavelengths of , passes through a third total reflection prism 37 and a fourth total reflection prism 38 , is focused by a condensing lens 39 , and is made incident on the incident end surface of the light guide 14 .

On the other hand, when the light source connectors 5B, 5D, 5E and the signal connectors 6B, 6D of the color mosaic type electronic scope 2B and color mosaic type external type fiberscope 2D1 fiberscope 2E with camera are connected,
The identification circuit 28 determines which scope 2 is connected based on the signals from the type signal circuits 27B and 27D, and instructs the movement control circuit 66 to reversely rotate the movement motor 48, for example. As a result, as shown in FIG. 1(b), the rack 47
The first total reflection prism 34 and the fourth total reflection prism 38 provided on the upper part of the light source lamp 31 and the condensing lens 3
4, the white light is defocused by a condensing lens 39 and is made to enter the incident end surface of the light guide 14.

Note that the total reflection prism forming the optical system may be a plane mirror. Furthermore, the optical path may be changed by moving the second total reflection prism 36 and the third total reflection prism 37.

By the way, the video processor 258 is for frame-sequential signal processing, and is connected to the frame-sequential signal connector receiver 12.
The signals input to the signal input terminal are input to the frame sequential process circuit 41a, and the signals imaged under the illumination light of each wavelength of R, G, and B are converted into color signals R, G, and B. It is designed to be output as . Each of these 0 beliefs @R, G,
B is output by the output circuit 80 from the three primary color output terminal 43 as a three primary color signal RGB. Further, the color signals R, G
, B are converted to NTSC composite video signals,
It is output from the SC output terminal 46.

A rotational position n sensor 51 for detecting the rotational position is provided at one location on the outer periphery of the rotary filter 33 of the light source section 15a, and the output of this rotational position sensor 51 controls the timing of the clock of the timing generator 52. The timing generator 52 is synchronized 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.

The frame-sequential process circuit 41a is configured as shown in FIG. 7, for example.

That is, the signal inputted via the preamplifier is inputted to the sample bold circuit 54, sampled and held, then subjected to γ correction in the γ correction circuit 55, and converted into a digital signal by the A/D converter 56. The signals imaged under the sequential illumination of R, G, and B through the multi-break length 57 which is switched by the signal of the timing generator 52 are written into the R frame memory 58R, the G frame memory 58, and the GSB frame memory 58B. It will be done.

The signal data written in each of these frame memories 58R, 58G, and 58B are simultaneously read out and converted into analog color signals R1G and B by a D/A converter 59, respectively.
It is output to the output circuit 80.

On the other hand, the signals captured by the solid-state image sensor 18 or 22 of the color mosaic electronic scope 2B or the mosaic external fiberscope 2E are input to the color mosaic process circuit 41b, where the luminance signal Y1 color difference signal R- Y, BY are output. This signal is then input to the output circuit 80, converted into an NTSC composite video signal, and outputted from the NTSC output terminal 46. Also,
The luminance signal Y1 color difference signal R-Y, B-Y is converted into color signals R, G, B by the output circuit 80, and the three primary color signals RGB are outputted from the three primary color signal output terminal 43.

The color mosaic process circuit 41b is configured as shown in FIG. 8, for example.

That is, the solid-state image sensor 1 amplified by the preamplifier 24
The signal from 8 or 22 passes through a brightness signal processing circuit 61 to generate a brightness signal Y. In addition, the color signal reproducing circuit 62
and the color difference signal R-Y.

B-Y is generated in time series for each horizontal line, white balance compensated by the white balance circuit 63, one is sent directly to the analog switch 64, and the other is delayed by one horizontal line by the 1H delay line 63a and sent to the analog switch. 64a, and the timing generator 52
The color difference signals R-Y and B-Y are obtained by the switching signal.

Note that the timing generator 52 applies signals to the drivers 26a, 26b and an NTSC encoder (not shown), respectively, and performs υ control so that signal processing is performed in synchronization with the drive pulse used to read out signals from the solid-state image sensor 18 or 22. In this case, the frame-sequential video processor 2
5a, the timing generator 52 is synchronized with the rotary filter 33 by the output of the position sensor 51.

By the way, the type signal generation circuits 27A and 27B.

27G and 27D are formed, for example, by connecting resistors with different resistance values between two terminals, and on the other hand, the identification circuit 28 uses a comparator or the like to determine the resistance value between the two terminals. It is possible to identify whether the scope is connected.

The identification circuit 28 controls switching of the changeover switch 103 in addition to controlling both drivers 26a and 26b. For example, when the field sequential type scope 2A or 2C is connected, it is switched to the field sequential side, and the drive pulse of the driver 26a is applied to the solid-state 'J'J'v'Q element 18 via the connector, and the solid-state image sensor The signal read from 18 is input to the frame sequential process circuit 41a.

On the other hand, if the field sequential type scopes 2Δ and 2G are not connected, the mosaic type process circuit side is selected. With this configuration, it can also be used as a light source for a fiberscope. Incidentally, 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 handle either method.

Further, as shown in FIG. 9, the output circuit 80 includes a 3-circuit, 2-contact changeover switch 81 between the output end of the matrix circuit 44a and the NTSC encoder 45, and a switch 81 with 3 circuits and 2 contacts between the output end of the inverse matrix circuit 44b and the driver. A three-circuit, two-contact changeover switch 82 is also provided between the forming buffer 42 and the buffer 42 to be formed.

When one contact side of the changeover switch 81 is turned on, the signal of the matrix circuit 44a is guided to the common NTSC encoder 45, and this NTSC encoder 45
Common NTSC output terminal 4 converted to SC video signal
Output from 6. When the other contact side is selected, the signal from the mosaic process circuit 41b is guided to the NTSC encoder 45 and output from the common NTSC output ra46.

On the other hand, as for the other changeover switch 82, when the frame sequential type side is selected, the output signal of the frame sequential type process circuit 4ia passes through the common buffer 42 forming a driver, and the three primary color signals are output from the common RGB output terminal 43. Output. or,
When the mosaic process circuit side is selected, the three primary color signals R, G, and B pass through the inverse matrix circuit 44b and the common R
It is output from the GB output terminal 43.

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

FIG. 10 relates to a second embodiment of the present invention, and FIG. 10(a)
10(b) is an explanatory diagram of the configuration of the light source device when emitting R, G, and B color light, and FIG. 10(b) is an explanatory diagram of the configuration of the light source device when emitting white light.

The light source section 15a is configured as shown in FIGS. 10(a) and 10(b).

A light source lamp 15 that emits white light and a light guide 14
A first total reflection prism 67 and a second total reflection prism 71 are provided on the optical axis connecting the incident end face of the light beam.

The first total reflection prism 67 includes an optical axis on one surface with a right angle therebetween, and is provided so that this surface has an angle of 45 degrees with respect to the optical axis.

Further, the second total reflection prism 71 is disposed symmetrically to the oblique side of the first total reflection prism 67 with an angle of λ1.

A mirror 68 is located in the opposite direction of the first total reflection prism 67.
is provided so as to be able to reflect the incident light in the same direction as the emission direction of the light source lamp 31. Similarly, a mirror 69 is provided in the reflection direction of the second total reflection prism 71.
It is provided so that 168 reflected lights can be used.

Between the VL 68 and the mirror 69, a color transmitting filter 30, which is a rotary filter, is arranged to pass through the optical path.

A vL 74 is provided in the reflection direction of the other surface of the first total reflection prism 67, and a vL 74 is provided in the reflection direction of the second total reflection prism 71, and the reflected light of the mirror 74 is provided in the reflection direction of the second total reflection prism 71.
It is now possible to enter L76.

Further, a condensing lens 72 is provided between the second total reflection prism 71 and the entrance end surface of the light guide 14 .

The first total reflection prism 67 and the second total reflection prism 71 are attached to a holding member 73 provided with a moving means (not shown).
They are held together by themselves.

By the way, the field sequential type electronic scope 2A and the field sequential type external connection are the light source connector 5Δ of the camera-equipped fiber scope 2G.
, 5C and signal connector 6A.

When 6C is connected, type signal generation circuit 27A.

Based on the signal from 27C, the identification circuit 28 determines which scope 2 is connected, and instructs the movement control circuit 66 to rotate the movement motor 48, for example, in the forward direction.

Then, the holding member 73 is moved by a moving means (not shown) such as a rack, a pinion, etc. as shown in FIG. 10(a).
As shown in FIG.
is moved onto the optical axis connecting the incident end faces of the first total reflection prism 67, and white light is made incident on one side of the first total reflection prism 67 at right angles, so that it can be transmitted through the color transmission filter 30.

On the other hand, when the color mosaic type electronic scope 2B, the color mosaic type external type is connected to the camera month fiber path]-72D, and the light source connectors 5B, 5D, 5E and signal lids 6B, 6D of the fiber scope 2F are connected, the type Signal circuit 27B.

Based on the signal from 27D, the identification circuit 28 determines which scope 2 is connected, and instructs the movement control circuit 66 to rotate the movement motor 48, for example, in a reverse direction.

As a result, the holding member 73 is moved by a moving means (not shown) such as a rack, a pinion, etc., and the light emitted from the light source lamp 31 is made to enter the third mirror 74.

Other configurations and operations are similar to those of the first embodiment.

[Effects of the Invention] As explained above, according to the present invention, by being equipped with an optical system that can select an optical path that passes through a color filter and reaches an object, and an optical path that reaches an object without passing through a color filter. Since it is possible to output illumination light and white light that are compatible with a scope equipped with a field-sequential imaging means, a scope equipped with a field-sequential imaging means and a scope equipped with a color mosaic imaging means]- This has the advantage of being able to supply illumination light that is compatible with fiberscopes and fiberscopes capable of visual observation.

[Brief explanation of the drawing]

FIGS. 1 to 9 relate to a first embodiment of the present invention.
Figure (a) is an explanatory diagram of the configuration of the light source device when emitting R, G, and B color light, Figure 1 (b) is an explanatory diagram of the configuration of the light source device when outputting white light, and Figure 2 (a) is ) is a block diagram showing the configuration of the endoscope device, Figure 2 (a) is an explanatory diagram showing the configuration of a color mosaic electronic scope, and Figure 3 is a block diagram showing the configuration of a color mosaic electronic scope. Figure 4 is an explanatory diagram showing the configuration of the mosaic external fiberscope with camera; Figure 5 is an explanatory diagram showing the configuration of the fiberscope; Figure 6 is the system of the endoscope device. A perspective view showing the whole, FIG. 7 is a block diagram showing the configuration of the frame-sequential wrestling circuit, FIG. 8 is a block diagram showing the configuration of the mosaic process circuit, and FIG. 9 is an explanatory diagram showing the configuration of the output circuit. , FIG. 10 relates to the second embodiment of the present invention, and FIG.
FIG. 10(a) is an explanatory diagram of the configuration of a light source device when emitting R, G, and B color light, and FIG. 10(b) is an explanatory diagram of the configuration of the light source device when emitting white light. 15...Light source device 31...Light source lamp 33...Rotating filter 34...First total reflection prism 36...Second total reflection prism 37...Third total reflection prism 38. ... Fourth total reflection prism 47 ... Rack 49 ... Binion Fig. 3 Fig. 5 Fig. 6 Fig. 7 Fig. 41° Fig. 8 Fig. 10 (a) Fig. 10 (b) Procedure Official document (method) July 31, 1985 Director General of the Patent Office Kunio Ogawa 1, Indication of matter f [1986 Patent Application No. 11640
No. 4 No. 2, Title of the invention Endoscope light source device 3, Relationship to the amended person's case Patent applicant representative Satoshi Shimoyama 4, agent address 7-4-4 Nishi-Shinjuku, Shinjuku-ku, Tokyo 5,
Date of amendment order: July 28, 1988 (shipment date)
1. In the 13th line of page 6 of the specification, the statement ``Figure 2 (a) is a color mosaic type danzi'' has been corrected to ``Figure 2 (b) is a color mosaic type danzi.'' 2. In the third line of page 26 of the specification, the statement ``Figure 2 (a) is a color mosaic type danzi'' is corrected to ``Figure 2 (b) is a color mosaic type danzi''.

Claims (1)

[Claims] An optical system that allows selection of a light source that emits white light, a filter that sequentially transmits each color light in a field-sequential method, and an optical path in which the white light passes through the filter and reaches the subject, and an optical path in which the white light reaches the subject without passing through the filter. An endoscope light source device comprising a system.