JPH0745058Y2 - Light source device for endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention supplies illumination light suitable for a scope having a frame-sequential imaging means, a scope having a color mosaic imaging means, and a fiberscope. The present invention relates to a light source device for an endoscope.

[Problems to be Solved by Conventional Techniques and Inventions] In recent years, a slender insertion portion is inserted into a body cavity to observe an organ in the body cavity or the like, and a treatment instrument inserted into a treatment instrument channel as necessary. An endoscope (also referred to as a scope or a fiberscope) capable of performing various therapeutic treatments by using the is widely used.

Further, various electronic scopes using a solid-state image pickup device such as a charge coupled device (CCD) as an image pickup means have been proposed. This electronic scope has advantages that it has a higher resolution than that of a fiberscope, that recording and reproduction of images are easy, and that image processing such as image enlargement and comparison of two images is easy.

In the method of picking up a color image of the electronic scope, for example, as shown in Japanese Patent Laid-Open No. 61-82731, a surface in which illumination light is sequentially switched to R (red), G (green), B (blue), etc. Sequential type and, for example, as shown in JP-A-60-76888, a filter array in which color filters for transmitting R, G, B color lights respectively are arranged in a mosaic pattern on the front surface of a solid-state image sensor. There is a color mosaic type (also called 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 no color shift occurs.

Further, the electronic scope is diversified depending on the purpose of use. For example, for the upper or lower digestive system,
The outer diameter of the insertion part is around 10 mm. On the other hand, for bronchus, for example, an outer diameter of around 5 mm is usually required. As described above, it is physically and performancely impossible to use the same type of image pickup element and the same type of image pickup method for various electronic scopes in which the outer diameter of the insertion portion is wide. That is, for example, in order to realize an electronic scope for bronchus (small diameter), it is unavoidable to use an image sensor having a small number of pixels.

When the number of pixels is small in this way, in order to prevent a decrease in resolution, the surface sequential method is illuminated with light of each wavelength of R, G, B rather than the 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 are combined to display in color.

On the other hand, for those having an outer diameter of about 10 mm, it is advantageous to increase the number of pixels and use the color mosaic type image pickup method for improving the 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 electronic scope requires light that is sequentially switched to R, G, B, and the like. Furthermore, even with the same frame-sequential imaging method, depending on the type of solid-state imaging device and the application of the endoscope,
Since it is necessary to change the spectral intensity of the illuminating light and the blanking period, it is necessary for the user to prepare different light source devices and perform different operations depending on the type of scope, 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 information of blood with a general visible region image.

The present invention has been made in view of these circumstances, and is a scope provided with one light source device and a field sequential imaging means,
Scope equipped with color mosaic type imaging means, fiber scope capable of observing with the naked eye, external television camera equipped with a field sequential type imaging means attachable to the eyepiece of the fiber scope, and color mosaic type imaging For an endoscope capable of supplying illumination light suitable for an external television camera equipped with a means, and switching the illumination light to illumination light suitable for special light observation etc. by changing the insertion direction of the filter cassette. An object is to provide a light source device.

[Means for Solving the Problem and Its Action] In order to achieve the above-mentioned object, a light source device for an endoscope according to the present invention comprises a light source for emitting white light as illumination light, and A filter cassette can be inserted and removed between the subject and this filter cassette.
A main filter member that sequentially transmits each frame-sequential color light and a plurality of portions that are located on the optical axis of the light source by changing the mounting direction of the filter cassette are provided, and each of these optical axis positions has at least one wavelength region. And an auxiliary filter member provided with a plurality of types of wavelength selection means capable of transmitting the light.

With this configuration, the filter cassette is inserted and removed on the optical axis of the light source in the light source device for an endoscope. By changing the inserting direction of the filter cassette, the filter cassette is positioned on the optical axis of the light source. The wavelength selecting means of the auxiliary filter member is switched.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

1 to 11 show an embodiment of the present invention.

As shown in FIGS. 5A to 8, the endoscope device 1
The light source device of the present embodiment and a video processor for performing video signal processing are housed in the scope, and various scopes (endoscopes) 2
Control device 1a that can connect any of A, 2B, 2C, 2D, 2E
Is equipped with. As shown in the figure, there are five types of scopes, namely, a frame sequential electronic scope 2A, a color mosaic electronic scope 2B using a color mosaic filter, and a fire bar scope with an external frame sequential TV camera (hereinafter , A fiber-scope with a frame-sequential TV camera) 2C, a fiberscope with a color-mosaic TV camera (hereinafter referred to as a fiber-scope with a color-mosaic TV camera) 2D, and a fiberscope 2E.

Each of the scopes 2A, 2B, 2C, 2D, 2E has an elongated insertion portion 3 and an operation portion 4 connected to the rear end side of the insertion portion 3, and a universal portion (not shown) from the operation portion 4 is provided. The cord is extended, and light source connectors 5A, 5B, 5C, 5D and 5E are provided at the tip of the universal cord (not shown).
Further, 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. Further, the fiber-scope 2C with a frame-sequential TV camera and the fiberscope 2D with a color-mosaic TV camera are configured by mounting a frame-sequential TV camera 8C and a color-mosaic TV camera 8D on the eyepiece 7 of the fiberscope 2E. And 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 of the scopes 2A, 2B, 2C, 2D, 2E (hereinafter, represented by reference numeral 2 when common to all scopes) Control device 1a so that each scope 2 can be used by connecting 5E.
, A set of connector receivers is provided on the front surface of the housing. These connector receivers include a light source connector receiver 11 and a signal connector receiver 12. The light source connector receiver 11 has such a shape that the light source connectors 5A, 5B, 5C, 5D and 5E of the same shape of the respective scopes 2 can be connected to each other. 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 connecting and using the Fiberscope 2E,
Although it is macroscopic observation, when using other scopes 2A, 2B, 2C, 2D, by the color monitor 13 connected to the signal output terminal of the control device 1a, it is possible to display the captured image in color. .

In addition, the light source connectors 5A, 5B, 5C, 5D,
5E, in this embodiment, together with the light guide connector,
An air / water-feeding connector (not shown) is provided, and the connector receiver 11 also 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.

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

Further, in each of the scopes 2, an objective lens 17 for image formation is arranged at the tip of the insertion portion 3. At the image-forming position of the objective lens 17, a solid-state image pickup device 18 such as a CCD is arranged in both the frame sequential type or the color mosaic type electronic scopes 2A or 2B, while the fiberscope 2E, the television camera 8C or In the television camera-equipped fiberscope 2C or 2D equipped with 8D, the image guide 19 is disposed so that the incident end face of the image guide 19 faces. Further, an eyepiece lens 21 is arranged so as to face the exit end surface of the image guide 19, and in the fiberscope 2E, it is possible to bring the eye close to the eyepiece portion 7 for observation with the naked eye. .

On the other hand, in the case where the frame sequential TV camera 8C or the color mosaic TV camera 8D is attached to the eyepiece 7 of the fiberscope 2E, the solid state is faced to the eyepiece lens 21 via the image forming lens (not shown) and solid-state. An image pickup device 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.
(Represents 6A, 6B, 6C, 6D.) And is input to the video processor 25a or 25b via the signal connector receiver 12 to which the connector 6 is connected. A clock for driving the solid-state image pickup device is applied to the solid-state image pickup device 18 or 22 from the driver 26a or 26b of the video processor 25a or 25b.

In addition, the type signal generation circuit 27A, which outputs the type signal for scope identification, to the scopes other than the fiberscope 2E,
27B, 27C and 27D are provided so that they can be 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 light source unit 15a is provided in the control device 1a which can be connected to any of the scopes 2.
Light source device 15 consisting of two video processors 25a, 25
b and are stored.

The light source device and the video processor may be housed in separate housings instead of being housed in a single device housing as shown in FIG.

The light source unit 15a of the light source device 15 includes a light source lamp 31 that emits white light as shown in FIGS. 1 and 5 (a),
The light source lamp 31 and a parallel light lens 36 which is located on the optical path connecting the incident end faces of the light guide 14 on which the illumination light is incident and which makes the illumination light parallel light, and the surface sequential electronic scope 2A on the light source device 15. Alternatively, when a frame-sequential television camera 8C is connected, it functions as a color separation means for color-separating the collimated illumination light, and a color mosaic electronic scope 2B.
Or a rotary filter as a main filter member that transmits white light when a color mosaic type TV camera 2D is connected.
33, and an insertable / detachable filter cassette 38 having an auxiliary filter member having a wavelength selection means capable of transmitting a part of the wavelength region of the illumination light, and a condenser lens for condensing the illumination light transmitted through the filter cassette 38. 37 and are arranged.

As shown in FIG. 2, the filter cassette 38 is configured so that it can be inserted into and removed from the optical path of the light source device 15, which is a mounting portion, from an insertion opening 78 provided in the entry plate 77 of the control device 12, for example.

The filter cassette 38 has a rotary filter 33 provided therein as shown in FIGS. 1, 3 and 4, and the rotary filter 33 has a disk shape and extends in the circumferential direction of the plate surface. Has a color transmission filter 32R, 32G, 32B of three primary colors of red (R), green (G), and blue (B), and converts white light emitted from the light source lamp 31 into red, green, and blue wavelengths. As the illumination light, the illumination light suitable for the frame sequential electronic scope 2A and the frame sequential television camera 8C can be emitted. The rotary filter 33 is, for example, a transmission filter for blue (B) and green (G).
32B, has a white light transmission window 34 that transmits white light as it is on the frame surface between 32G, and a light shielding body 34a that also functions as a fly weight that rotates around a fulcrum is supported adjacent to the transmission window 34,
When the rotary filter 33 is rotating, the light shield 34a is
That is, when emitting the illumination light for the frame-sequential electronic scope 2A or the frame-sequential television camera 8C, a light shielding member 34a which also serves as a flat weight by centrifugal force is shown by a imaginary line in FIG. As described above, the transmission window 34 is shielded so that the white light does not interfere with the time-series transmission of the white, red, green, and blue wavelengths. On the other hand, when the illumination light for the color mosaic electronic scope 2B or the color mosaic television camera 2D, the fiberscope 2E is emitted, the rotary filter 33 is stopped and its transmission window 34 is positioned on the optical path of the light source lamp 31. Further, when the rotation filter 33 is in a stopped state, the light shield 34a also serving as a fly weight is suspended in the vertical direction as shown by the solid line in FIG. 4 to open the transmission window 34 so that white light is transmitted. It has become.

The rotary filter 33 is a color transmission filter 32R, 32G, 32
A plurality of holes 47, 47 for timing detection are provided in the circumferential direction on the inner diameter side of B in order to read signals from the solid-state image sensor.

As described above, the rotary filter 33 is rotatably accommodated in the filter cassette 38, and the filter cassette 38 is provided with the concave boss portion 67 having the front side opening from the front plate 48 to the rear plate 49. A pair of bearings 39, 39 are arranged in front of and behind the inner periphery of the portion 67, and the bearing 39, 39 supports a concave rotary shaft 40 having an opening on the front side.
A rotation center hole of a disk-shaped rotary filter 33 is fitted and attached to the outer periphery of the.

Further, the recess 66 of the rotary shaft 40 has grooves 51, 51 at the top and bottom thereof. Then, the pins 69 and 69 that engage with the grooves 51 and 51, respectively.
The drive shaft 68 of the rotary filter drive motor 70 provided with is engaged with the recess 66 of the rotary shaft 40 in a removable manner. The drive motor 70 and the drive shaft 68 include slide bearings 72a, 72a.
The drive shaft 68 is slidably supported in the axial direction by b, and the drive shaft 68 is detachably attached to the rotary shaft 40 of the filter cassette 38, and the drive shaft 68 penetrates, for example, the front plate 71 of the controller 12, A detachable knob 73 located in front of the front plate 71 is provided in series.

With this configuration, by pulling the detachable knob 73 forward and sliding the drive shaft 68 axially forward, the engagement between the drive shaft 68 and the rotary shaft 40 of the filter cassette 38 is released, and the filter cassette 38 is in the free state. The control device 12 can be attached and detached.

Further, the filter cassette 38 has a square front surface in the example shown in FIG. 1, and the fan-shaped transmission window 100, in which the wavelength selection means is provided on the boss portion 67 of the front plate 48 and on each of the four sides. ... has been drilled. Each of the transmissive windows 100, ... When the filter cassette 38 is inserted through the insertion port 78, the insertion direction of each side is sequentially changed, so that the light source lamps 31 respectively.
It is designed to be sequentially located on the optical path of. Then, for example, an infrared cassette filter 93 is provided in one of the transmission windows 100, a neutral density filter (ND filter) 94 having a dimming effect is provided in the other, and irradiation is provided in the other one. A special light observing filter 96 that transmits a part of the wavelength region of light is provided, and the other one has no filter and has an opening 97.

The infrared cut filter 93 is used to remove an infrared component included in the illumination light. Further, the special light observation filter 96, for example, is capable of transmitting a wavelength band in which the absorbance remarkably changes depending on the amount of hemoglobin in the blood and the oxygen saturation,
It is used for special light observation.
Further, the opening portion 97 is connected to the color mosaic electronic scope 2B or the color mosaic television camera 8D and the fiberscope 2E when the rotary window 33 is stopped and the transmission window 34 is positioned on the optical path. It is supposed to be used when

The front plate 48 is provided on the rear plate 49 of the filter cassette 38.
A transparent window of the same shape and size is formed at the same position as each of the transparent windows. Further, in the illustrated embodiment, the filter cassette is square and four transmission windows are formed to provide four kinds of wavelength limiting means. However, by making them into a regular pentagon or a hexagon, It is possible to increase the transmission window and the wavelength control means.

The rotary filter 33 is provided with a plurality of holes 47, 47 ... 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. And
The front plate 48 and the back plate 49 are provided with windows 53, 53 so as to face the hole 47 for timing detection, and for example, a light emitting element 74 is provided so as to face the hole 47 from one window 53. A photo sensor 75, for example, is provided so as to face the hole 47 from the other window 53.

In the filter cassette 38, information such as a ROM (read only memory) for distinguishing the type of filter, a combination of contacts, a spectral intensity of illumination light passing through the rotary filter 33, a bun-racing period, and the like are stored. A filter type recording unit 83 is provided and is connected to a contact 84 provided on the side surface of the filter cassette 38.

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, and the rotary filter 33 in the inserted filter cassette 38 is connected. The type and characteristics of the signal are transmitted to the timing generator 52, and a signal suitable for this can be output 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. There is.

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

By the way, one of the video processors 25a is for processing a frame-sequential signal and receives a connector for a frame-sequential signal.
The signals input to the 12 signal input terminals are input to the frame-sequential process circuit 41a, and the signals imaged under illumination light of each wavelength of R, G, B are color signals R, G, It is designed to output as B. These color signals R, G, B are output to the output circuit 8
When set to 0, the three primary color output terminals 43 output the three primary color signals RGB. The color signals R, G, B are converted into an NTSC composite video signal and output from the 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 hold circuit 54, sampled and held, and then γ corrected by the γ correction circuit 55 and converted into a digital signal by the A / D converter 56. Then, the signal picked up under the R, G, B field sequential illumination through the multiplexer 57 which is switched by the signal of the timing generator 52 is R
It is written in the frame memory 58R, G frame memory 58G, B frame memory 58B. Each of these frame memories 58R, 58G, 5
The signal data written in 8B are read simultaneously and
The analog color signals R, G, B are converted by the D / A converter 59 and output to the output circuit 80.

On the other hand, the signals picked up by the solid-state image pickup device 18 or 22 of the color mosaic electronic scope 2B and the mosaic type fiberscope 2E with an external camera are input to the color mosaic type process circuit 41b, and the luminance signal Y and the color difference signal R- are input. 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. Further, the luminance signal Y and the color difference signals RY and BY are supplied by the output circuit 80 to the color signals R, G, and
It is converted to B and the three primary color signal RGB is output from the 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 signal from the solid-state imaging device 18 or 22 amplified by the preamplifier 24 is subjected to the luminance signal processing circuit 61 to generate the luminance signal Y. In addition, the color signal reproduction circuit 62 inputs the color difference signal R
-Y and BY are generated in time series for each horizontal line, and white balance compensation is performed by the white balance circuit 63. One is directly delayed by the analog switch 64 and the other is delayed by one horizontal line by the 1H delay line 63a. Are input to the analog switch 64a, and the color difference signals RY and BY are obtained by the switching signal of the timing generator 52.

Note that the timing generator 52 is
Apply signals to a, 26b and NTSC encoder not shown,
The solid-state imaging device 18 or 22 is controlled to perform signal processing in synchronization with a drive pulse used for signal reading. 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 generating circuits 27A, 27B, 27C, 27D are formed by connecting, for example, resistors having different resistance values between two terminals, while the identification circuit 28 determines the resistance value between the two terminals. It is possible to identify which resistance value scope is connected by using a comparator or the like.

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

On the other hand, if the frame sequential scopes 2A and 2C are not connected,
The mosaic process circuit side is selected. 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 any method can be dealt with.

Further, as shown in FIG. 11, the output circuit 80 includes three circuits 2 between the output end of the matrix circuit 44a and the NTSC encoder 45.
Inverted matrix circuit with contact changeover switch 81
A three-circuit, two-contact changeover switch 82 is also provided between the output end of 44b and the buffer 42 forming the driver.

The changeover switch 81, when one contact side is turned on,
Common NTSC encoder 45 for signals from matrix circuit 44a
The NTSC encoder 45 converts the video signal into an NTSC video signal and outputs it from the common NTSC output terminal 46. When the other contact side is selected, the signal of the mosaic process circuit 41b is guided to the NTSC encoder 45 and output from the common NTSC output terminal 46.

On the other hand, with respect to the other changeover switch 82, when the frame-sequential side is selected, the output signal of the frame-sequential process circuit 41a passes through a common buffer 42 forming a driver and a common RGB signal.
The output terminal 43 outputs the three primary color signals. When the mosaic process circuit side is selected, the inverse matrix circuit 44
The three primary color signals R, G, B that have passed b are output from the 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 transmission window of the filter cassette 38 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 the present embodiment, the filter provided in the transmission window of the filter cassette 38 is selectively inserted into the optical path of the illumination light by changing the insertion direction of the filter cassette 38 to remove the infrared component. It is possible to perform dimming of illumination light, transmission of a wavelength range where special observation can be performed, and the like.

Further, in the present invention, the white light transmitting window and the light shield can be omitted from the rotary filter of the illustrated example by separately preparing the above-mentioned filter cassette without the rotary filter. That is, when obtaining illumination light corresponding to a color mosaic type electronic scope, an external camera, and a fiberscope, it suffices to insert a filter cassette not equipped with this rotary filter into the light source device, and By changing the insertion direction, it is possible to selectively obtain illumination light suitable for various special light observations.

It should be noted that a filter cassette may be constructed by omitting the white light transmitting window and the light shield from the illustrated rotary filter. In this case, the illumination light applied to the color mosaic type electronic scope, external camera, or fiberscope is used. To obtain it, the filter cassette may be removed from the light source device. Again,
The light blocking body and the operating means for blocking the white light transmitting window provided in the rotary filter are not limited to the flyweights in the illustrated example, but various types such as springs and solenoids may be used.

[Advantages of the Invention] As described above, according to the present invention, one light source device includes a scope having an image pickup device of a frame sequential type, a scope having an image pickup device of a color mosaic type, and a fiber observable with the naked eye. It is possible to supply illumination light that is suitable for an external television camera equipped with a scope and a frame-sequential imaging means that can be attached to the eyepiece of this fiberscope, and an external television camera equipped with a color mosaic imaging means. At the same time, change the illumination light to the illumination light suitable for special light observation, etc.
There is an effect that it is possible to switch by changing the insertion direction of the filter cassette.

[Brief description of drawings]

1 to 11 relate to an embodiment of the present invention. FIG. 1 is a schematic perspective view showing a configuration of a filter cassette and a light source unit, and FIG. 2 is a perspective view showing a filter cassette and an endoscope control device. 3 is a sectional view showing the structure of the rotary filter, FIG. 4 is a sectional view taken along the line AA ′ of FIG. 3, and FIG. 5 (a) is a block diagram showing the structure of the endoscope device. FIG. 6B is an explanatory view showing the configuration of a color mosaic electronic scope, FIG. 6 is an explanatory view showing the configuration of a fiber-sequential external camera-equipped fiberscope, and FIG. 7 is a mosaic-type external camera-equipped fiberscope. FIG. 8 is an explanatory diagram showing the configuration, FIG. 8 is an explanatory diagram showing the configuration of a fiberscope, FIG. 9 is a block diagram showing the configuration of a frame sequential process circuit, and FIG. 10 is a block diagram showing the configuration of a mosaic process circuit. Figure 11 shows the configuration of the output circuit. A click view. 15Q …… Light source part, 31 …… Rotary filter 33 …… Rotary filter 38 …… Filter cassette, 78 …… Insertion port 93 …… Infrared cut filter 94 …… ND filter 96 …… Special light observation filter 97 …… Aperture

(72) Inventor Hiromasa Suzuki 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. (72) Issei Nakamura 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. (72) Inventor Akihiko Miyazaki 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd. (72) Inventor Yoshinao Daimei 2-43-2 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A light source device for an endoscope, comprising a light source for emitting white light for illuminating a subject, comprising: a filter cassette which can be interposed between the light source and the subject; and a front plate and a back of the filter cassette. The same shape and size are formed at the same position of the face plate, and by changing the insertion direction of the filter cassette, a plurality of transmission windows, one of which is located on the optical axis of the light source, are provided with one opening transmission window. Except for the auxiliary filter member provided with each of a plurality of types of filters capable of transmitting at least a part of the wavelength region, and rotatably provided in the filter cassette, red, green, blue of the frame sequential type. And a main filter member comprising a rotary filter provided so that one of the three primary color transmission filters and a white light transmission window face the transmission window located on the optical axis of the auxiliary filter member. Rotated position adjacent to the white light transmission window as a fulcrum,
A light source for an endoscope, comprising: a light shield that opens the white light transmitting window when transmitting white light.