JPH01158930A - Endoscopic apparatus - Google Patents

Abstract

PURPOSE:To observe the interior of tissue by infrared rays easy to transmit through a living body, by irradiating the living body with illumination light containing infrared rays through the tissue thereof and taking the image of the object subjected to transmitted illumination. CONSTITUTION:An endoscopic apparatus 1 is constituted of an electronic endoscope 2, an external light source apparatus 3 applying illumination light to a living body from the outside, an image signal processing circuit 28, a control apparatus having a light source apparatus 5 for intracorporeal illumination and a monitor 7 as a display means. The reflected light from a region to be observed by the illumination light emitted from the light source apparatus 5 for intracorporeal illumination is received by a solid-state image sensing element 15 through an image forming optical system 14 and, for example, the reflected image by visible light from the surface of the region to be observed is observed. The projection image of the tissue of a living body by the illumination light containing infrared rays emitted from the external light source apparatus 3 is taken by the solid-state image sensing element 15 having sensitivity to infrared rays.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an endoscope device that is capable of observing the inside of a living tissue using light transmitted through the tissue.

[Problems that conventional technology and inventions are trying to solve In recent years,
Endoscopes are widely used because they can be used to observe organs within a body cavity by inserting the m-tube into the body cavity, and to perform various therapeutic procedures as needed using a treatment instrument inserted into the treatment instrument channel. Now you can.

In conventional endoscopes, the surface of the body cavity is observed by irradiating illumination light onto the tissue within the body cavity and receiving reflected light from the tissue surface. However, recently, there has been a desire to observe not only the surface of tissues within body cavities, but also the inside of the tissues, such as blood vessels and tumors inside the stomach wall and mucous membranes. Therefore, for example, as shown in Japanese Patent Publication No. 54-21678, it has been proposed to illuminate from outside the body and observe using the light that has passed through the tissue.

However, with normal illumination from outside the body using visible light, the light transmittance of living organisms is low, so observation and diagnosis using an endoscope is difficult due to insufficient light intensity, and large-sized
There are problems such as the need for a light source that is heavy and consumes a lot of power.

Furthermore, when observing a transmitted image by external illumination and a reflected image by internal illumination at the same time, the ratio of the transmitted image to the reflected image is Because it was not possible to variably control the image size, it was not possible to obtain an image with the optimal ratio for the observation site or observation purpose.

Further, in the Japanese Patent Publication No. 54-21678, since a transmitted image obtained by flash light is photographed, there is a problem that continuous transmitted images cannot be obtained.

Note that Japanese Patent Publication No. 56-50576 discloses an apparatus capable of irradiating human tissue with high brightness light and photographing the light transmitted through the human tissue using an infrared filter. However, this device has a problem in that both the light emitting source and the infrared film are located outside the body, and the areas that can be observed are limited.

[Purpose of the Invention] The present invention has been made in view of the above circumstances, and allows for easy observation of the inside of a living tissue by using light that has passed through the living tissue. The purpose of the present invention is to provide an endoscope device that can obtain a wide range of images.

[Means and effects for solving the problems] The endoscope apparatus of the present invention includes an illumination means for irradiating illumination light including at least infrared light into the living body through the living tissue, and an elongated lamp to be inserted into the living body. an insertion section; and a photographing means having a light-receiving section provided in the insertion section, having sensitivity to at least infrared light, and photographing a subject image transmitted and illuminated by the illumination means; This allows the inside of a tissue to be observed using external light. Further, the endoscopic VL device of the present invention has a first tube that irradiates the illumination light into the living body through the living tissue.
The exposure control means includes a control means for controlling at least one of the exposure amount R of the illumination light of the illumination means and the exposure amount of the illumination light of the second illumination means that irradiates the illumination light from inside the living body to this inside of the living body. , the ratio between the transmitted image and the reflected image can be controlled.

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

1 and 2 relate to a first practical example of the present invention, FIG. 1 is an explanatory diagram showing the configuration of an endoscope device, and FIG. 2 is an explanatory diagram showing the tip of an electronic endoscope. be.

As shown in FIG. 1, the endoscope device 1 includes an electronic endoscope 2, an external light source device 3 that provides illumination light to the electronic endoscope 2 from outside the body, and a cable connected to the electronic endoscope 2. The control device 6 is connected to a video signal processing circuit 28 and a light source device 5 for internal illumination, and a monitor 7 is connected to the control device 6 as a display means.

The electronic endoscope 122 includes an elongated insertion section 10 and a left side of a large-diameter operation section 11 connected to the rear end of the insertion section 10. The insertion portion 10 may be soft or hard,
It can be inserted into the body cavity 12a of the human body 12 from the oral cavity or the like. The distal end portion 13 of the insertion portion 10 has a second
As shown in the figure, an imaging optical system 1 consisting of an objective lens system, etc.
4 is provided, and at the imaging position of this imaging optical system 14, a solid-state imaging probe 15 such as a COD is disposed as an imaging means. This solid-state image sensor 15 is sensitive to at least infrared light. The output signal of the solid-state wjL image element 15 is transmitted to the video signal processing circuit 2 in the control device 6 via the signal line 16 inserted into the insertion section 10 and the cable 4.
The signal is inputted to the monitor 8, converted into a video signal, and then inputted to the monitor 7, where the observed image is displayed.

On the other hand, the light source device @5 in the control device 6 has a light source 18, and the light emitted from the light source 18 is collected by reflection 119, passes through a filter 20, and is connected to a flexible fiber bundle. The light is incident on a light guide 21 formed by. This light guide 21 is inserted into the cable 4 and the insertion section 10, and the illumination light incident on this light guide 21 is emitted from the output DAE of this light guide 21 at the distal end portion 13, and is directed toward the subject. It is designed to be irradiated by

Note that the light source 18 is a xenon lamp.

Halogen lamps, strobe lamps, etc. are used, and the wavelength range of the light emitted is in the ultraviolet and visible regions.

It may be one or both of the infrared regions, or all of the infrared regions.

Further, the filter 20 is an infrared cut filter or the like, and is appropriately selected depending on the wavelength range to be observed.

Further, the external light source device 3 has a light source 23, and the light emitted from the light source 23 passes through a filter 24 and is irradiated onto the body surface 25 of the human body 12. Then, a projected image of the body tissue by the illumination light irradiated onto the body surface 25 is captured by the solid-state image sensor 15 of the electronic endoscope 1i2.

Note that the light source 23 is a xenon lamp.

A halogen lamp, a strobe lamp, or the like is used, and the wavelength range of the emitted light includes at least the infrared region.

The filter 24 may be an infrared transmission filter, a filter that transmits the infrared region and a part of the visible region, a filter that transmits a specific infrared region, or a filter that transmits the infrared region and a part of the visible region.
Transmits infrared light of 000n and generates heat of 1100n
Heat ray cut filters that cut infrared light of 0n or more, etc.
It is a filter that transmits at least infrared light, and is appropriately selected depending on the wavelength range to be observed.

The external light source device E3 is suspended from, for example, a support stand 31 via a flexible arm 32, so that its position relative to the human body 12 can be adjusted.

In this embodiment configured as above, the illumination light in the visible range, emitted from the light source device 5 for internal illumination and passed through the filter 20, is transmitted from the output end of the light guide 21 to the observed region inside the body cavity 12a. is irradiated. Then, reflected light from the observation site due to this illumination light passes through the imaging optical system 14 and is received by the solid-state imaging probe 15, and a reflected image of the surface of the observation site using visible light, for example, is observed.

On the other hand, illumination light including at least infrared light emitted from the external light source device 3 is irradiated onto the body surface 25, passes through the tissue of the living body 4, and reaches the inside of the body cavity 12a.

Then, a projected image of the living tissue by this illumination light is captured by the solid-state imaging device 15 that is sensitive to at least infrared light.

Note that it is possible to observe the reflected image by internal illumination and the projected image by external illumination at the same time, or it is also possible to observe only one image by setting the illumination light to either outside the body or inside the body. be.

As described above, in this embodiment, the illumination light from outside the body includes at least infrared light that easily passes through the living body. Therefore, a sufficient amount of infrared light passes through the living body, and by receiving and imaging this infrared light, the inside of the tissue can be easily observed.

Furthermore, by using infrared light as the external illumination light, the light source 23 of the external light source device 3 can be made smaller, lighter, and consume less power.

In addition, since infrared light is absorbed by hemoglobin in the blood, by using infrared light as external illumination light, visible light can be used to detect the running status of blood vessels in the mucous membrane and tumors, etc., depending on the amount or presence of blood. can be observed more easily than in the field.

FIG. 3 is an explanatory diagram showing an electronic endoscope in a second practical example of the present invention.

In this embodiment, a condenser lens 34 is provided at the distal end 13 of the insertion section 10.
An infrared detecting element 35 is provided on the condensing side of the condensing lens 34. The output signal of this infrared detection element 35 is connected to a control device 6 via a signal line 36 inserted into the insertion section 10 and the cable 4, and a light amount detection circuit 38 provided in this control device 6 detects the infrared rays. The amount of infrared light incident on the cable 35 can be detected.

According to this embodiment, the positional relationship with the external light source device 3 can be determined by the amount of infrared light incident on the infrared detection element 35. Therefore, by adjusting the positions of the tip portion 13 and the external light source device @3 so that the amount of infrared light incident on the infrared detection element 35 increases, efficient illumination can be achieved.

FIG. 4 is an explanatory diagram showing the spectral transmission characteristics of living tissue for explaining the third embodiment of the present invention.

This embodiment uses a filter 24 similar to that of the first embodiment or the second embodiment, which has a transmission characteristic of transmitting red to near-infrared light of about 600 nm or more. is red to near-infrared light with a wavelength of approximately 6QQnm or more.

As shown in Figure 4, living tissue has extremely high transmittance in the wavelength region of about 600 nm or more, and even for pigments in the human body such as hemoglobin in blood, there is a red wavelength of about 600 nm or more in the shell. Since near-infrared light has a high transmittance, it is easier to observe a transparent image than when using normal visible light.

In this example, the wavelength range of the external illumination light is approximately 6
00nm or more, for example, 600 to 780n
m or red light in the visible range of 600 to 700 nm.

Other functions and effects of Configuration 1 are those of the first embodiment or the second embodiment.
This is similar to the example.

5 and 6 relate to a fourth embodiment of the present invention, FIG. 5 is an explanatory diagram showing the configuration of an endoscope apparatus, and FIG. 6 is an explanatory diagram showing the distal end of the endoscope.

In this embodiment, an image guide 42 formed of a flexible fiber bundle is inserted into the insertion section 10 of an endoscope (fiberscope) 41.
The distal end surface is arranged at the imaging position of the imaging optical system 14 disposed at the distal end portion 13. The observation image formed on the distal end surface of the image guide 42 is guided to the operating section 11 by the image guide 42.
The object is observed through an eyepiece section 43 consisting of an eyepiece lens or the like connected to the rear end of the camera.

Further, a television camera 44 that is sensitive to at least infrared light is connected to the eyepiece section 43 as an imaging means. The output signal of the television camera 44 is input to a video signal processing device 45, converted into a video signal, and then input to a monitor 7, on which an observed image is displayed. Note that if the insertion section 10 is rigid, a relay lens system or the like may be used as the image transmission means instead of the fiber bundle. The other configurations are the same as in the first embodiment.

In this embodiment, a reflected image of the internal illumination light emitted from the light source device 5 and a projected image of the internal tissue due to the external illumination light emitted from the external light source device 3 are formed on the distal end surface of the image guide 42 by the imaging optical system 14. be done. This observed image is guided to the operation unit 11 by the image guide 42, imaged 11a by the television camera 44, and displayed on the monitor 7.

Note that when observing in the visible range, it may be directly observed with the naked eye from the eyepiece section 43.

Other functions and effects are similar to those of the first embodiment.

7 and 8 relate to a fifth embodiment of the present invention, FIG. 7 is an explanatory diagram showing the configuration of an endoscope device, and FIG. 8 is a sectional view showing the distal end of the endoscope. It is.

This embodiment, like the fourth embodiment, uses a fiber scope 4.
This is an example in which a television camera 70 is connected to the eyepiece section 43 of the first embodiment.

The distal end portion 13 of the fiberscope 41 is configured as shown in FIG. 8, for example.

That is, the distal end portion 13 includes a treatment instrument channel 61 through which a treatment instrument for treating living tissue is inserted, a light guide 62 for illuminating the living tissue from inside the body, and a light guide 62 connected to the distal end side of the light guide 62. light distribution lens 63
, an objective lens system 64, and an optical image of the observation site formed by the objective lens system 64 is transmitted to the eyepiece unit
an image guide 65 for transmitting images to the objective lens system 6;
4 and a nozzle 66 for cleaning the deposits adhering to the surface.

The treatment instrument channel 61 communicates with an insertion port 67 provided in the operating section 11. Further, the light guide 62 is connected to the insertion portion 12. It is inserted into the operating section 11 and the cable 4 and extends to a connector connected to the light source device 6 . Further, the image guide 65 extends to the eyepiece section 43, and the eyepiece section 43 has an eyepiece lens 49 facing the rear end surface of the image guide 65. The optical image transmitted by the image guide 65 can be observed from this eyepiece section 43. Furthermore, an air/water supply channel 68 provided within the insertion portion 12 is connected to the nozzle 66 .

The television camera 70 includes an imaging lens 71 that collects light from the eyepiece section 43 to form an optical image, and this imaging lens 7.
A solid-state imaging device 72 is disposed at the imaging position 1 and photoelectrically converts the optical image to produce a video signal, and a solid-state imaging device 72 is disposed between the imaging lens 71 and the solid-state imaging device 72 and divides the optical path into two. It includes a prism 73 and a light receiving element 74 that is disposed on an optical path divided by the prism 73 and detects the exposure level of the solid-state image sensor 72.

The output signal of the solid-state U+>mechanical element 72 is input to a video processor 76, and is subjected to signal processing such as waveform shaping, γ correction, and white balance. The video signal output from this video processor 76 is input to the monitor 7, and the observed image is displayed. Further, the video signal from the video processor 76 is input to a video tape recorder (VTR) 77 so that an observed image can be recorded.

On the other hand, the output signal of the light receiving element 74 is input to a control circuit 78 provided within the light source device 6. This control circuit 78 is configured to control the light amount of the light source 18 for internal illumination and the light source 23 for external illumination based on the output of the light receiving element 74.

According to this embodiment, the exposure level in the solid-state image sensor 72 is detected by the light receiving element 74 provided in the television camera 70, and based on the output of the light receiving element 74, the light source 18 for internal illumination and the light source 18 for external illumination are detected. Since the amount of light from the light source 23 can be controlled, for example, the amount of light incident on the solid-state image sensor 72 can be kept approximately constant.

The other functions and effects of Structure 2 are the same as those of the fourth embodiment.

FIG. 9 is an explanatory diagram showing the configuration of an endoscope apparatus according to a sixth embodiment of the present invention.

This embodiment is an example in which a still camera 80 is connected to the eyepiece section 43 of a fiber scope 41 similar to that shown in the fifth embodiment.

The still camera 80 includes an imaging lens 81 that collects light from the eyepiece 43 to form an optical image, and a film 82 that is disposed at the imaging position of the imaging lens 81 and records the optical image. , a prism 83 disposed between the imaging lens 81 and the film 82 and dividing the optical path into two; and a light receiver disposed on the optical path divided by the prism 83 for detecting the exposure level on the film 827. element 84
It is equipped with The film 82 may be sensitive to visible light and infrared light, or may be sensitive only to visible light, or may be a film sensitive to visible light and infrared light, if necessary. You can also replace the film with one that changes the sensitivity accordingly.

The output signal of the light receiving element 84 is input to a control circuit 78 provided within the light source device 6. This control circuit 78, based on the output of the light receiving element 84,
The light intensity of the light source 18 for internal illumination and the light source 23 for external illumination is controlled. In this embodiment, the light receiving element 84 is connected to the eyepiece section 43 of the fiber scope 41.
, it is connected to a signal line 86 extending from the eyepiece 43 of the fiberscope 41 to the connector of the cable 4, and is connected to the control circuit 78 via this signal line 86.

According to this embodiment, it is possible to easily photograph a transmitted image of the inside of a tissue.

Other functions and effects of the configuration 1 are the same as those of the fifth embodiment.

FIGS. 10 and 11 relate to a seventh embodiment of the present invention, with FIG. 10 being an explanatory diagram showing the configuration of an endoscope apparatus, and FIG. 11 being an explanatory diagram showing the distal end of the endoscope.

In this embodiment, as shown in FIG. 11, an infrared film or the like sensitive to at least infrared light is used as an imaging means at the imaging position of the imaging optical system 14 disposed at the distal end 13 of the endoscope 46. A film 47 having a
Observed images are recorded. Further, the operating section 11 of the endoscope 1'i46 is provided with a release lever 49 for operating the shutter.

As shown in FIG. 10, the endoscope 46 may be capable of observing an observation image transmitted by an imaging optical system and an image guide through an eyepiece section 43, or may be capable of observing an observation image transmitted to the film 47. It may be possible to record only .

The other functions and effects of the configuration 9 are the same as those of the first embodiment.

FIG. 12 is an explanatory diagram showing the distal end portion of an endoscope in an eighth embodiment of the present invention.

In this embodiment, the distal end portion 13 of the endoscope is similar to the seventh embodiment.
The image of the subject can be recorded using a film attached to the camera.

The endoscope of this embodiment includes a lamp 91 at the distal end 13 for illuminating the living tissue from within the body, and a lens 92 for diffusing the light emitted from the lamp 91 and irradiating the living tissue.
and internal illumination light by the lamp 91 and external light source 23
A lens 93 that condenses a subject image using external illumination light.
and a prism 9 that divides the optical path from this lens 93 into two.
4. An imaging lens 95 is disposed on one optical path divided by the prism 94, and the distal end surface of an image guide 96 inserted into the insertion section 10 is located at the imaging position of the imaging lens 95. It is located. The image guide 96 extends to an eyepiece (not shown) and transmits a subject image to the eyepiece.

On the other hand, an imaging lens 97 is disposed on the other optical path divided by the prism 94.
A film 98 for recording a subject image is disposed at an imaging position 7.

Further, the distal end portion 13 is connected to an air/water supply channel formed in the insertion portion 10, and is connected to the lens 92.
．． A nozzle 99 that opens toward the 93 side is provided. By blowing out cleaning water from this nozzle 99, deposits on the surfaces of the lenses 92 and 93 can be removed and cleaned.

Other functions and effects of the configuration 1 are the same as those of the first embodiment.

FIG. 13 is an explanatory diagram showing the configuration of an endoscope apparatus according to a ninth embodiment of the present invention.

In this embodiment, a light amount adjusting means 51 for adjusting the light i) of the light source 23 of the external light source device 3 is provided at or near the operating section 11 of the electronic endoscope 2, and the other configuration is as follows. 1
This is similar to the example.

When observing a projected image of internal tissue using external illumination light, the light transmittance differs depending on the observation site, so the light source 23
Even if the amount of light is made constant, the amount of transmitted light is not constant, which may cause problems in observation.

According to this embodiment, since the amount of light from the light source 23 can be adjusted depending on the observed region, it is possible to keep the amount of light incident on the solid-state image sensor 15 substantially constant.

In this embodiment, instead of the electronic endoscope 2, a television camera or a still camera may be connected to the eyepiece section 43 of the fiberscope 41 as in the fourth to sixth embodiments, or a seventh embodiment may be used. An endoscope having a film disposed at the distal end 13 as in the embodiment and the eighth embodiment may be used.

FIG. 14 is an explanatory diagram that does not show the structure of an endoscope apparatus according to a tenth embodiment of the present invention.

In this embodiment, the control device 6 includes a light source device 52 for internal illumination. In addition to the video signal processing circuit 53, a light amount detection circuit 54 is provided. The light amount detection circuit 54 detects the amount of light within the field of view of the electronic endoscope 2 from the output of the video signal processing circuit 53. The light amount detected by the light amount detection circuit 54 is compared with a predetermined value in a comparison circuit 55, and based on the output of this comparison circuit 55, the light amount control circuit 56 controls the amount of light within the field of view of the electronic endoscope 2. The amount of light from the light source 23 of the external light source device 3 is controlled so that the amount of light is approximately constant.

The other configurations are the same as in the first embodiment.

According to this embodiment, the amount of light incident on the solid-state image sensor 15 can be automatically made substantially constant. For example, in the case of only external illumination, the amount of light such as infrared rays from the external illumination can be automatically made substantially constant.

In this embodiment, instead of the electronic endoscope 2, a television camera or a still camera may be connected to the eyepiece section 43 of the fiberscope 41 as in the fourth to sixth embodiments, or a seventh embodiment may be used. An endoscope having a film disposed at the distal end 13 as in the embodiment and the eighth embodiment may be used.

FIG. 15 is an explanatory diagram showing the configuration of an endoscope apparatus according to an eleventh embodiment of the present invention.

In this embodiment, as in the second embodiment shown in FIG. The amount of light from the light source 23 is controlled based on the amount of infrared light received by the light source 35. The other configurations are the same as those of the tenth embodiment.

According to this embodiment, if the internal illumination light is changed to visible light and the external illumination light is changed to infrared light using the filters 20 and 24, for example,
The amount of light from the external illumination light can be made substantially constant independently of the internal illumination light. Conversely, it is also possible to observe internal illumination light as infrared light and external illumination light as visible light; in this case, the amount of external illumination light is controlled by detecting the amount of visible light. be able to.

FIG. 16 is an explanatory diagram showing the configuration of an endoscope apparatus according to the M12 embodiment of the present invention.

In this embodiment, as in the seventh embodiment, a subject image can be recorded using a film provided at the distal end portion 13 of the endoscope 46.

In this embodiment, the operating section 11 of the endoscope 46 is provided with two release buttons 101 and 102. In addition, the optical yfA device 5 includes a light f! for internal illumination. A light amount control circuit 104 is provided to control the amount of light of the light source 18 and to control the light source 23 for external illumination so that it can emit flash light. A release signal from the release button 102 is input to this light amount υIm1 circuit 104.

When one of the release buttons 101 is pressed, the image of the subject that is being photographed is reflected in the lighting conditions at that time. Also, if the other release button 102 is not pressed,
A release signal from this release button 102 is input to the light amount control circuit 104, and this light amount control circuit 10
4 emits flash light from the external illumination light source 23, so that the subject image is shaded by the brighter external illumination light.

According to this embodiment, the light source 2 for external illumination can be used as needed.
By emitting flash light 3, it is possible to easily capture a subject image with an increased ratio of transmitted images.

Other functions and effects of Configuration 1 are the same as those of the seventh embodiment.

FIG. 17 is an explanatory diagram showing the configuration of an endoscope apparatus according to a thirteenth embodiment of the present invention.

This embodiment is an example in which living tissue is illuminated from within the abdominal cavity in order to obtain a transmitted image.

As shown in FIG. 17, in this embodiment, a first endoscope 1 is inserted into a human body 12 to observe internal organs 12b.
10, and a second internal organ 11120 for irradiating and observing intraperitoneal organs from the outside.

Like the electronic endoscope 2 in the first embodiment, the first internal reception ff 1110 includes an elongated and flexible insertion section 111;
It includes an operating section 112 connected to the rear end of the insertion section 111, and a universal cord 113 extending from the operating section 112 and connected to the control device 6 as shown in FIG. The distal end portion 114 of the insertion portion 11 includes an imaging optical system 115 and a solid-state imaging device 11 that is disposed at the imaging position of the imaging optical system 115 and is sensitive to visible light and infrared light.
6 is provided. The solid-state image sensor 116 includes:
A signal line 117 is connected to the insertion section 111. Operation unit 112. and universal code 1
13 and is connected to the video signal processing circuit 28 in the control device 6. Further, a light distribution lens 118 is provided at the tip portion 114, and a light guide 119 is connected to the rear end side of this light distribution lens 121. This light guide 119 includes the insertion portion 11
1. Operation unit 112. It is inserted into the universal cord 113 and connected to the light source device 5 in the control device 6.

On the other hand, a small puncture hole is formed in the body surface 25, and a medical tube 122 such as a trocar to be inserted into the abdominal cavity is punctured through this puncture hole. And this medical pipe 122
The second endoscope 120 is inserted through the through hole 124 of the trocar tube 123. This second endoscope includes, for example, a flexible insertion section 125 and this insertion section 1.
An operating section 126 connected to the rear end of 25, and this operating section 12
6 and a light guide cable 127 extending from the light guide cable 127. A connector 128 is provided at the tip of the light guide cable 127 and is detachably connected to a connector receiver of the light source unit 130. Further, an eyepiece section 129 is provided at the rear end of the operation section 126. An objective lens 131 is provided at the distal end of the insertion section 125.
and a light distribution lens 132 are provided. At the imaging position of the objective lens 131, the tip end surface of the image guide 133 is arranged. The image guide 133 is inserted into the insertion section 125 and extends to the eyepiece section 129. This eyepiece section 129 has an eyepiece lens 134 facing the rear end surface of the image guide 13, so that the image transmitted by the image guide 133 can be observed from the eyepiece section 129 through the eyepiece lens 134. ing. Further, a light guide 135 is connected to the rear end side of the light distribution lens 132, and this light guide 135 is connected to the insertion portion 125. The operating section 126 is inserted into the light guide cable 127 and the connector 1
28. The light source unit 130 has a lamp 137, and the light emitted from the lamp 137 is condensed by a condenser lens 138 and enters the incident end of the light guide 135. Note that the lamp 137 is adapted to emit light including an infrared region. In addition, the insertion section 1 of the second internal pA mirror 120
A bendable bending section is provided on the distal end side of 25, and the operating section 126 is provided with a bending device (not shown) for bending the bending section. By changing the position of the distal end of the insertion section 125, any part can be illuminated.

In this embodiment, the second family gift 11120 is the medical pipe 12.
The trocar tube 123 is inserted into the abdominal cavity through the through hole 1244 of the second trocar tube 123. The illumination light emitted from the lamp 137 in the light source unit 130 is transmitted to the second endoscope 12.
0 connector 128° light guide 135. The light is emitted from the distal end of the insertion section 125 via the light distribution lens 132,
Irradiates internal organs from the outside. As described above, this illumination light includes at least light in the infrared region.

A transmitted image of the living tissue by this illumination light is captured by the solid-state image sensor 116 of the first endoscope 110 and displayed on a monitor (not shown). It has been reported that infrared light has excellent permeability through mucous membrane tissue and is easily absorbed by blood flowing within blood vessels. Therefore, the second one? ! 1f
By illuminating with the 1120 and observing with the first endoscope 110, the running state of the blood vessel, etc. can be observed in detail using a transmitted image in the infrared region.

Further, according to this embodiment, in the region where the transmission image is to be observed,
Since the illumination light can be irradiated from closer, a good transmitted image can be obtained.

It goes without saying that a reflected image can be observed through the first endoscope 11110 using the illumination light emitted from the first endoscope vA110.

Note that a second endoscope 120 illuminates internal organs in the body cavity from the outside.
may be a flexible internal 1A mirror with a flexible insertion part,
An optical viewing tube with a rigid insertion portion may also be used.

In this embodiment, the second endoscope 120 uses an image guide 133 as an observation means to direct an image to the eyepiece 12.
9, and observation is made from this eyepiece section 129, but an electronic endoscope having a solid-state image sensor provided at the tip or operation section may also be used. In addition, the first endoscope is inserted into the body cavity and observes the image transmitted by illumination light from outside the organ! ! 11
Although 10 is an electronic endoscope in this embodiment, it may be a fiberscope or the like.

Also, instead of the second endoscope, an optical controller is used.

Only a light guide such as a light guide fiber is connected to the medical pipe 12.
2 may be inserted into the body cavity for illumination.

In the first to thirteenth embodiments described above, if a solid-state image sensor is used as the imaging means, the illumination light is R(
Color images can be obtained using a field-sequential method that sequentially switches to red), G (green), B (blue), R, W (white), B, etc., or a simultaneous method where a color filter is attached to the front of the solid-state image sensor. Anything is fine.

Alternatively, a combination of a television camera, an infrared film, etc. may be used. Moreover, the light source device 5, light guide, etc. for internal illumination may not be provided.

FIG. 18 is an explanatory diagram showing the configuration of an endoscope apparatus according to a fourteenth embodiment of the present invention.

The endoscope apparatus of this embodiment includes an external illumination device 141 that illuminates the inside of the living body from outside the body. This external lighting device 14
1 is a control section 142 and this control section 1
A telescopic mechanism 143 connected to 42 and a telescopic mechanism 14
A light source moving device @146 is connected to the light source moving device @146 and has a plurality of joint portions 144a, 144b and arm portions 145a, 145b connected to the joint portions. lamp 147a.

147b and 147c. The light source 148 is electrically connected to the control unit 142.

Furthermore, an illumination lamp 152 is provided at the bottom of the examination table 151 on which the subject 150 is placed, facing upward. It is composed of a light-transmitting member 153 that transmits the emitted light. The illumination lamp 152 is
It is electrically connected to the control section 142.

This control section 142 controls each lamp 147a, 147b, 147c of the light source 148 and the lamp 152.
The lighting and light amount are controlled.

During the examination, the subject 150 assumes an examination position such as supine on the examination table 151, and the insertion section 10 of the electronic endoscope 2 shown in the first embodiment is inserted into the body cavity. This electronic endoscope 2 is connected to a control device 6 in which a video signal processing circuit 28 and a light source device 5 are incorporated.

The other configurations are the same as in the first embodiment.

In this embodiment, the external illumination device 141 is configured to operate the light source 148 and the lamp 1 by operating the control section 142.
52 is operated to turn on the light. The light source 148
The light emitted from each of the lamps 147a, 147b, and 147C passes through the living body, and a transmitted image of the blood vessels under the mucous membrane of the internal organs is formed by the imaging optical system 1 provided at the tip of the internal organ #12.
4, the image is formed on the solid-state image sensor 15, and an image is formed.

Then, the output signal of this solid-state image sensor 15 is controlled at t11.
+ signal processed by the video signal processing circuit 28 in the device 6;
A transmitted image is displayed on the monitor 7.

When observing this transmitted image, it is necessary to illuminate from an efficient direction in order to obtain an image more suitable for diagnosis.

For this reason, in this embodiment, between the control section 142 and the light source 148, there is a telescopic mechanism 143 and a light source moving means 1.
46, and the practitioner can illuminate and observe the inside of the living body from a desired position by appropriately operating the expansion/contraction mechanism 143 and the light source moving means 146.

In addition, when the subject 150 is supine and illumination from the back is required, the illumination lamp 152 provided on the examination table 151 is turned on, and the transparent member 153 on the upper surface of the examination table 151 is turned on. It is possible to illuminate the inside of a living body by transmitting it and irradiating it onto the living body.

When illuminating the inside of a living body from outside the body using the external illumination device 141, as described above, the illumination distance and angle can be changed as appropriate, but the amount of illumination light can be adjusted by operating the control section 142 to The number of 148 lamps to be lit may be controlled. In addition, the lamps 147a, 147b, and 147c provided in the light source 148 are not limited to visible light, and can emit at least one of visible light, infrared light, and ultraviolet light.
It is fine as long as it emits one.

Note that the external illumination device 141 may include either the expansion mechanism 143 or the light source moving means 146.

FIG. 19 is an explanatory diagram showing the configuration of an endoscope apparatus according to a fifteenth embodiment of the present invention.

In the endoscope apparatus of this embodiment, the external illumination device @161 includes a control section 142 and an arch-shaped main body 16 that is detachably attached to the examination table 151 and surrounds the subject 150.
2. A plurality of illumination lamps 163a, 163b, .
These illumination lamps 163a, 163b, . . . are provided at appropriate intervals along the circumferential direction of the subject 150. These lighting lamps 16
3a, 163b, . . . are the control section 142
electrically connected to. By operating this control section 142, the lamp 163a,
163b, . . . are controlled to turn on and off.

Further, on the inspection table 151, as in the fourteenth embodiment,
The illumination lamp 152 is stepped and faces upward.

Observing from inside the body cavity of subject 150? ! The other configurations, such as the mirror 2, are the same as in the fourteenth embodiment.

In this embodiment, the main body 162 of the external illumination device @161 covers approximately half the circumference of the subject 150, and a plurality of lamps 163a, 163b, . By controlling the control unit 142, the person lights one or more lamps 163a, 163b, ... No. lighting is possible. Further, the amount of light emitted can also be changed by operating the control unit 142.

Other functions and effects are similar to those of the fourteenth embodiment.

Note that a lamp 163a is provided on the main body 162.

163b, . . . are not limited to visible light, and may be anything that emits at least one of visible light, infrared light, and ultraviolet light.

In J3 of the fourteenth and fifteenth embodiments, the observation means is not limited to the solid-state imaging device 15 provided at the distal end of the insertion section 10, but may also be a fiberscope as in the fourth to sixth embodiments. It may be observed through the eyepiece of the eyepiece, observed with a television camera connected to this eyepiece, or photographed with a still camera, or alternatively, as in the seventh or eighth embodiment, the insertion part may be used for observation. The information may be recorded on a film provided at the tip of the holder.

20 to 23 relate to the 16th embodiment of the present invention, in which FIG.
The figure is an explanatory diagram showing the distal end of the endoscope, FIG. 22 (A> is a timing chart showing the emission timing of internal illumination light,
FIG. 22(B) is a timing chart showing the emission timing of external illumination light, and FIG. 23 is a dimensional explanatory diagram showing changes in light reception levels of internal illumination light and external illumination light.

As shown in FIG. 20, the endoscope device 201 includes an electronic endoscope vL 202, an external illumination light source 203 that provides illumination light to the electronic endoscope 202 from outside the body, and the electronic endoscope 202.
2 via a cable 204.
and a monitor 206 as a display means connected to this control device 205.

The front endoscope 202 includes an elongated insertion section 207 and a large-diameter operation section 208 connected to the rear end of the insertion section 207. The insertion portion 207 may be soft or hard, and can be inserted into the body cavity 209a of the human body 209 from the oral cavity or the like. As shown in FIG. 21, the distal end portion 210 of the insertion portion 207 is provided with an imaging optical system 211 consisting of an objective lens, etc.
A solid-state imaging device 212 such as a COD is disposed at an imaging position 11 as an imaging means. This solid-state image sensor 21
The output signal of No. 2 is the insertion part 207 and the cable 204.
The control device 20 via a signal line 213 inserted therein.
The signal is input to the signal level detection circuit 215 in the video signal processing circuit 216 through the signal level detection circuit 215.
is input. The video signal processing circuit 216 then performs signal processing such as waveform shaping, γ correction, matrix processing, white balance, etc., and converts the signal into, for example, an NTSC format video signal, which is then input to the monitor 206 and displayed. The observed image is displayed on the monitor 206.

The control device @ 205 is provided with a light source 217 for internal illumination, and the light emitted from this light source 217 for internal illumination is as follows:
The light is focused and incident on a light guide 218 formed of a flexible fiber bundle. This light guide 218 is connected to the cable 204 and the insertion section 2.
The internal illumination light that enters the light guide 218 is emitted from the output end of the light guide 218 at the distal end 210, passes through the light distribution lens 219, and is directed to the subject. It is set to be irradiated. Then, reflected light from the observation site due to this internal illumination light passes through the imaging optical system 211 and is received by the solid-state image sensor 212, so that a defective image of the observation site is observed.

Note that as the light source 217 for internal illumination, a xenon lamp, a halogen lamp, a strobe lamp, etc. are used, and the wavelength region of the emitted light is in the ultraviolet region.

It may be one or both of the visible region and the infrared region, or all the regions, and is appropriately selected depending on the wavelength region to be observed.

On the other hand, the light emitted from the external illumination light source 203 is
The body surface 220 of the human body 209 is irradiated with the light. The external illumination light irradiated onto the body surface 220 passes through the living tissue and reaches the inside of the body cavity 209a, and an image of the living tissue transmitted by this external illumination light is captured by the solid-state image sensor 212. ing.

Note that the light source 203 for external illumination is a xenon lamp, similar to the light source 217 for internal illumination.

Halogen lamps, strobe lamps, etc. are used, and the wavelength range of the light emitted may be any one or both of the ultraviolet, visible, and infrared regions, or all of them, and the wavelength to be observed It is selected appropriately depending on the area.

In this embodiment, the signal level detection circuit 215 detects the signal level and ratio of the reflected image by the internal illumination and the transmitted image by the external illumination from the output signal of the solid-state imaging probe 212, and the level of this signal. The ratio between the reflected image and the transmitted image is detected from the ratio. The ratio between the anti-OA image and the transmitted image detected by the signal level detection circuit 215 is determined by the ratio setting circuit 221 and the exposure Q control 9.
The signal is input to a control section 223 consisting of 11 circuits 222. This control section 223 determines the ratio of the reflected image and transmitted image detected by the signal level detection circuit 215.
It is compared with the ratio set by the ratio setting circuit 221. Then, the exposure amount control circuit 222 controls fif
The light source 20 for external illumination
3 and the light emission level of the internal illumination light source 217 are controlled.

Note that the ratio between the reflected image and the transmitted image is detected, for example, as follows. That is, Fig. 22 (A> and Fig. 22 (
As shown in B), the external illumination moonlight source 203 and the intracorporeal illumination light source 217 are made to emit light alternately, and the signal from the solid-state image sensor 212 is divided at the timing of this emission to distinguish between the internal illumination light and the external illumination light. By detecting two types of signal levels, one due to light and the other, the ratio of the signal levels of the reflected image due to internal illumination and the transmitted image due to external illumination is detected.

The control section 223 also controls the ratio setting circuit 22.
Depending on how the ratio is set in step 1, the ratio between the amount of exposure due to internal illumination light and the amount of exposure due to internal illumination light can be changed as shown in Figure 23, or the ratio between the amount of exposure due to internal illumination light and the amount of exposure due to external illumination light can be changed. The ratio with the amount of light is maintained at a predetermined ratio, or the internal illumination light and the external illumination light are switched as shown in FIG.

Note that the control section 223 may be capable of manually changing the ratio of the amount of exposure due to internal illumination light to the amount of exposure due to external illumination light, or may be configured to automatically perform the above operation. It's good though.

In this embodiment configured as described above, the internal illumination light source 21
From 7! The emitted light is guided to the inside of the body cavity 209a by a light guide 218, and this light guide 218
The light is emitted from the light emitting end of the body, passes through the light distribution lens 219, and is irradiated onto the observation site inside the body cavity 209a. The reflected light from the observation site due to the internal illumination light passes through the imaging optical system 211 and is received by the solid-state image sensor 212, and a reflected image of the surface of the observation site is observed. From this reflected image, 1q of information such as minute irregularities on the surface of the observed region and subtle color differences can be obtained.

On the other hand, the light emitted from the external illumination light source 203 is irradiated onto the body surface 220, passes through the living tissue, and is transmitted to the inside of the body cavity.
It reaches 09a. Then, a transmitted image of the living tissue by this external illumination light is captured by the solid-state imaging device 212. From this transmission image, information such as the running status of submucosal blood vessels and the extent of tumor invasion can be obtained. Note that observation is facilitated by using infrared light that easily passes through the living body as the external illumination light.

Further, from the output signal of the solid-state image sensor 212, the signal level detection circuit 215 detects the ratio of the reflected image by the internal illumination and the transmitted image by the external illumination. Then, by the exposure amount control circuit 222 of the control unit 223,
The light emission levels of the external illumination light source 203 and the internal illumination light source 217 are controlled so that the ratio of the reflected image to the transmitted image becomes the ratio set by the ratio setting circuit 221.

According to this embodiment, for example, the control section 223
By changing the ratio of the exposure amount due to internal illumination light and the exposure amount due to internal illumination light, it is possible to observe reflected and transmitted images at the optimal ratio for the observation site and observation purpose. It becomes possible to understand the running status of submucosal blood vessels and internal changes in relation to the surface condition of the site. For example, as shown in FIG. 23, by gradually changing the ratio of the amount of exposure from internal illumination light to the amount of exposure from external illumination light, the same region can be divided into multiple reflected and transmitted images at different ratios. Observations can be made as a composite image, making it easy to find the optimal ratio for the observation site and observation purpose. For example, in Figure 23, if the ratio of the exposure amount due to internal illumination light and the exposure amount due to external illumination light is gradually changed over a period of 1 second and recorded for each frame, the ratio of the reflected image and the transmitted image will be different. Approximately 30 types of images are obtained.

Further, the control unit 223 controls the ratio of the amount of exposure due to the internal illumination light to the amount of exposure due to the external illumination light to a predetermined ratio, for example, a ratio that is optimal for the observation site and observation purpose. , different regions can be observed at the same ratio to detect changes between regions.

Further, by controlling the control unit 223 to switch between the internal illumination light and the external illumination light, it is possible to select a reflected image and a transmitted image depending on the observation site and observation purpose. After obtaining information such as minute irregularities and subtle color differences on the surface of the observation site, it becomes possible to obtain information such as the running status of submucosal blood vessels and the extent of tumor invasion from the transmission image.

Furthermore, according to this embodiment, since the ratio of the reflected image and the transmitted image can be detected with one system of signal level detection circuit 215, the control device 205 can be made smaller and lighter, and the internal illumination light and the external illumination light can be Individually controllable and highly accurate.

FIG. 24 is an explanatory diagram showing a solid-state image sensor according to a seventeenth embodiment of the present invention.

In this embodiment, a detection section 212a for detecting the exposure level of external illumination light or internal illumination light is provided on a part of the light receiving surface of the solid-state image sensor 212. For example, the external illumination light is near-infrared light that easily passes through the living body, the internal illumination light is visible light or ultraviolet light, and an infrared cut filter or visible cut filter is attached to the front surface of the detection section 212a. The detection unit 212a receives only one of the external illumination light and the internal illumination light. The detection section 212a
From the output, the signal level detection circuit 215 detects the received light level of the external illumination light or the internal illumination light. On the other hand, the signal level detection circuit 215 detects the total light reception level of the external illumination light and the internal illumination light from the output from the light receiving surface other than the detection section 212a of the solid-state image sensor 212. Then, the ratio of the external illumination light to the internal illumination light is detected from the ratio of the received light level of the external illumination light or the internal illumination light to the total light reception level. The other configurations are the same as those of the 16th embodiment.

According to this embodiment, the ratio of the reflected image to the transmitted image can be controlled while the external illumination light and the internal illumination light are continuously emitted.

FIG. 25 is a block diagram showing the configuration of an endoscope apparatus according to an 18th embodiment of the present invention.

The control device 230 in this embodiment includes the internal illumination light source 2
17, a video signal processing circuit 216 that performs signal processing such as waveform shaping, γ correction, and encoding of the output signal of the endoscope 202 inserted into the living body into an NTSC signal; An external illumination light amount detection circuit 231 detects the amount of transmitted light from outside the body from an output signal, an internal illumination light amount detection circuit 232 detects the amount of reflected light from the internal illumination, and the external illumination light amount detection circuit 231 and the internal illumination light amount detection circuit 232 detect the amount of reflected light from the internal illumination. a ratio detection circuit 233 that detects the ratio between the amount of external illumination light and the amount of internal illumination light from the output signal of the circuit 232;
Based on the ratio detected by this ratio detection circuit 233,
Control circuit 234 that controls the amount of light of the internal illumination light source 217
and a control circuit 2 that controls the light amount of the external illumination light source 203 based on the ratio detected by the ratio detection circuit 233.
It is equipped with 35.

In this embodiment, a filter 237 that transmits light in a desired wavelength range, such as infrared light, is provided in front of the external illumination light source 203.

The other configurations are the same as those of the 16th embodiment.

In this embodiment, the insertion section 207 of the endoscope 202 is inserted into the body cavity 209a of the human body 209, and the light source 217 for internal illumination is inserted into the body cavity 209a of the human body 209.
The inside of the body cavity 209a is illuminated by epi-illumination, while the external illumination light source 203 illuminates the observation site of the living body from outside the body. Images of the observation site illuminated from outside and inside the body by both light sources 217 and 203 are captured by the solid-state imaging device 212 of the endoscopic &fi 202, and the output signal of the solid-state imaging device 212 is sent to the video signal processing circuit 216. Waveform shaping and γ correction.

After processing such as matrix processing and white balance, the signal is converted into, for example, an NTSC video signal. This video signal is then input to the monitor 206, and the observed image is displayed on the monitor 206.

Further, from the output signal of the video signal processing circuit 216, an external illumination detection circuit 231 detects the amount of light caused by transmitted illumination, and an internal illumination light amount detection circuit 232 detects the amount of light caused by epi-illumination. A ratio detection circuit 233 detects the ratio of each exposure level from the output signals of the rain detection circuits 231 and 232. This ratio detection circuit 23
The light 61 of the internal illumination light source 217 and the external illumination light source 203 is controlled by the control circuit 234 and the control circuit 235 based on the ratio outputted by No. 3.

In this way, according to this embodiment, the amount of transmitted illumination light from outside the body and the amount of epi-illumination light from within the body can be controlled separately. Therefore, the observation of lesions and tissue conditions deep within the mucosal tissue, which are the characteristics of transmitted images using transmitted illumination, and the observation of the color tone and fine irregularities on the mucosal surface, which are the characteristics of reflected images using epi-illumination, are each optimal. Since the exposure can be controlled to a precise level, observation ability and diagnostic ability can be improved.

Other functions and effects are similar to those of the 16th embodiment.

~ FIGS. 26 and 27 relate to the 19th embodiment of the present invention, and FIG. 26 is a block diagram showing the configuration of the endoscope device,
FIG. 27 (A> is a timing chart showing the output of the timing generator, FIG. 27 (B) is the flip 70
Timing chart showing the output S1 of the whelk, Fig. 27 (
C) is a timing chart showing the output S2 of the flip-flop 70, FIG. 27(D) is a timing chart showing the output of the pulse generation circuit, FIG. 27(E) is a timing chart showing the output S1 of the flip-flop, Figure (F
) is a timing chart showing the output S2 of the flip 70 tube.

The control device @240 of this embodiment is a solid state R@240 of the endoscope 202.
a driver 241 that drives the element 212; a preamplifier 242 that amplifies the output signal of the solid-state image sensor 212;
The signal amplified by this preamplifier 242 is subjected to waveform shaping, γ
It includes a pro-hiss circuit 243 that performs signal processing such as correction and white balance, a matrix circuit 244 that generates a color difference signal from the output signal of this process circuit 243, and an encoder 245 that converts the color difference signal into, for example, an NTSC video signal. The video signal from the encoder 245 is input to the monitor 206, and the observed image is displayed on the monitor 206.

Also provided is a timing generator 246 that generates timing for the entire system and generates a β11 signal between each circuit. Furthermore, the timing generator 2
46, a count setting circuit 248 that can change the count number of this counter 247, and a pulse generation circuit 24 that generates pulses at the timing of a manual switching signal.
9, one of the pulse signals from the counter 247 and the signal from the pulse generation circuit 249 is selected by a switch circuit 250 which is switched by a switching circuit 258, and is input to the flip 70 knob 251. It has become so. This flip flop 25
1, the output is inverted every time a pulse is input.

The flip-flop 251 receives two signals S1. The control circuit 25 outputs the signal S2, and one signal S1 controls the power source 253 of the external illumination light source 203.
4, and the other signal S2 is input to a control circuit 256 that controls the internal illumination light source device 255, and turns on and off alternately for the external illumination light source 203 and the internal illumination light source bag @255. It is now possible to specify.

The other configurations are the same as those of the 16th embodiment.

Next, the operation of this embodiment will be explained with reference to FIG. 27 (A> to F).

The insertion section 207 of the endoscope 202 is inserted into the body cavity 209a of the human body 209, and the body cavity 209 is
09a is illuminated by epi-illumination, and on the other hand, an external illumination light source 203 illuminates the observation site of the living body from outside the body. Both light sources 2
55. At 203, the image of the observation site illuminated from outside and inside the body is captured by the solid-state image sensor 212 of the endoscope 202 in mB.
The observed image is displayed on the monitor 206.

The solid-state image sensor 212 is driven by a driver 241 in synchronization with a timing generator 246. From this timing generator 246, as shown in FIG.
A vertical synchronizing signal as shown in FIG. Here, the frequency division ratio by the counter 247 is determined by the count setting circuit 2.
48 can be arbitrarily set. For example, since the vertical synchronization signal is output at 60 Hz, if the frequency is divided by 1/60, an output signal is generated from the counter 247 approximately every second.

Further, the pulse generating circuit 249 generates a pulse when a switching signal is input by manual operation. The switch circuit 250 selectively inputs one of the pulses from the flff input circuit 247 and the pulse generation circuit 249 to the flip-flop 251 .

When the switch circuit 250 selects the output of the counter 247, the timing generator 246
As shown in FIG. 27 (A>), signals synchronized with the vertical blanking period are arbitrarily counted by a counter circuit 247, and the output of this count circuit 247 is input to a flip-flop 251 via a switch circuit 250. As shown in FIG. 27(B) and FIG. 27(C), this flip 70 knob 251 outputs two signals 31 and 32 having opposite phases to each other, and one signal S1 is transmitted outside the body. The other signal S2 is input to the control circuit 254 that controls the power source 253 of the illumination light source 203, and the other signal S2 is input to the internal illumination light source device 255.
The signal is input to a control circuit 256 that controls the external illumination light source 203 and the internal illumination light source device 255, and alternately designates on and off according to the output of the counter 247.

On the other hand, the switch circuit 250 is connected to the pulse generating circuit 249
When the output is selected, when a switching signal is manually input to the pulse generation circuit 249, the pulse from the pulse generation circuit 249 as shown in FIG. input into step 251. This flip-flop 251 is shown in FIG.
And as shown in FIG. 27(F), the reverse phase ON/OFF signal S1. S2, the control circuit 254 and the control circuit 25
6, and the internal illumination optical GI device 255 and the external illumination light source 203 are alternately turned on at the timing of the output pulse of the pulse generating circuit 249.

Turn off.

In this way, in this embodiment, when the switch circuit 250 selects the counter 247 side, a transmitted image by transmitted illumination from outside the body and a reflected image by epi-illumination from within the body can be automatically observed alternately. On the other hand, the switch circuit 2
When the pulse generation circuit 249 side is selected at 50, the transmitted image and the reflected image can be switched and observed at any timing.

Other functions and effects are similar to those of the 16th embodiment.

FIG. 28 is a block diagram showing the configuration of an endoscope apparatus according to a twentieth embodiment of the present invention.

The control device 260 of the present embodiment further includes a timing generator 24 in the control device 240 of the nineteenth embodiment.
A sample/hold circuit 261 inputs the vertical synchronizing signal outputted by 6 and samples and holds the video signal from the process circuit 243 at the timing of each field, and a sample/hold circuit 261 that samples and holds the video signal from the process circuit 243 at the timing of each field. Level detection circuit 26 that detects exposure level
2, and a ratio setting circuit 2 that sets the ratio of external illumination to internal illumination based on the exposure level detected by this level detection circuit 262 and controls each control circuit 254 and 256.
63. Note that the level detection circuit 26
2 inputs an on/off signal of the external illumination output from the flip-flop 251 to determine whether the detected exposure is due to external illumination light or internal illumination light.

In this embodiment, the vertical synchronization signal from the timing generator 246 is input to the sample/hold circuit 261, and the sample/hold circuit 261 samples the video signal from the process circuit 243 at the timing of each field. Hold. Then, from the video signal held by this sample/hold circuit 261,
The level detection circuit 262 detects the exposure level.

The level detection circuit 262 includes a flip-flop 251
Based on the external illumination ON/OFF signal output from the external illumination light, it is determined whether the detected exposure is due to external illumination light or internal illumination light, and based on the exposure level detected by this level detection circuit 262, the ratio setting circuit At 263, the ratio of external illumination and internal illumination is set, and each control circuit 254
．． 256 and control each lighting with arbitrary settings.

Other functions and effects are similar to those of the nineteenth embodiment.

FIGS. 29 and 30 relate to the 21st embodiment of the present invention,
Fig. 29 is a block diagram showing the configuration of the endoscope device;
The figure is an explanatory view without showing the distal end of the endoscope.

As shown in FIG. 30, the endoscope 270 of this embodiment includes an imaging lens 271 at the distal end 210 that collects light from a subject and forms an image. A prism 272 that separates light into two directions, and this prism 27
A solid-state image sensor 273 is placed at an imaging position on one optical path separated by the prism 272, and an infrared light etc. that is placed on the other optical path separated by the prism 272 and passes through the living body. The light receiving element 274 detects light on the long wavelength side. The other construction of the endoscopy f*270 is the same as that of the 16th embodiment.

On the other hand, as shown in FIG. 29, the control device 280 includes a level detection circuit 281 that detects the exposure level of the solid-state image sensor 273 from the output signal of the process circuit 243, and a level detection circuit 281 that detects the exposure level of the solid-state image sensor 273 from the output signal of the light receiving element 274. A level detection circuit 282 is provided that detects the exposure level only on the long wavelength side that is received by 273, and both level detection circuits 281,
The output of 282 is input to an arithmetic circuit 283. This arithmetic circuit 283
From the exposure level of the light receiving element 274 and the exposure level of the light receiving element 274, the ratio of transmitted light to the total amount of light is calculated. The output of this arithmetic circuit 283 is output from the ratio setting circuit 284.
It is now entered into This ratio setting circuit 28
4 sets the ratio of the transmitted light amount to the total light amount, and based on this ratio, each illumination light amount is set for the control circuit 254 for external illumination and the control circuit 256 for internal illumination. In this embodiment, the external illumination light uses light with a longer wavelength than the internal illumination light. for example,
If the external illumination light is infrared light, the internal illumination light may be visible light or ultraviolet light. Others, preamplifier 242. Matrix circuit 244° encoder 245. driver 24
1. The provision of a timing generator 246 is similar to the nineteenth embodiment.

In this embodiment, the light from the observation site illuminated by the external illumination light source 203 and the internal illumination light source device 255 is focused by the imaging lens 271, divided into two by the prism 272,
One is imaged by the solid-state image sensor 273, and the other is only the light on the long wavelength side that passes through the living body due to external illumination and is received by the light receiving element 274.

An image of, for example, mucosal tissue using transmitted light from external illumination and reflected light from internal illumination is captured by a solid-state image sensor 273, and the output signal of this solid-state image sensor 273 is sent to a preamplifier 242. Process circuit 243, matrix circuit 244.
The signal is processed by the encoder 245 and sent to the monitor 206.
The transmitted light image and the reflected light image are displayed at a set ratio.

From the output signal of the process circuit 243, the level detection circuit 281 detects the exposure level of the solid-state image sensor 273 due to both illumination lights, and from the signal photoelectrically converted by the light receiving element 274, the level detection circuit 282 detects the exposure level of the solid-state image sensor 273. , the exposure level of the solid-state image sensor 273 due to only the transmitted illumination light is detected. Then, from the outputs of both level detection circuits 281 and 282, an arithmetic circuit 283 measures the ratio of the amount of transmitted light to the total amount of light, and a ratio setting circuit 284 calculates the ratio of each illumination light to the set ratio. The control circuit 254 for external illumination and the control circuit 256 for internal illumination are controlled so that.

In this manner, according to this embodiment, the ratio of the transmitted image to the reflected image can be controlled in a state where the external illumination light and the internal illumination light are continuously irradiated.

Note that in this embodiment, the light receiving element 274 only receives light ω.
It does not have to be a detection element, but may be a solid-state image sensor dedicated to capturing an image on the long wavelength side by external illumination light, and this dedicated solid-state image sensor is used to detect the output signal from the solid-state image sensor 273. As in the case of , the exposure level may be detected using a preamplifier, a process circuit, and a level detection circuit. Further, by providing a solid-state IQ image element dedicated to capturing images on the long wavelength side in this way, it becomes possible to obtain two types of projected colors at the same time.

Further, as shown in the seventeenth embodiment, a light receiving section for detecting either the external illumination light or the internal illumination light may be installed near the image plane of the solid-state image sensor.

31 to 33 relate to the 22nd embodiment of the present invention, FIG. 31 is a block diagram showing the configuration of the endoscope device, and FIG.
2 is an explanatory diagram showing a rotating filter, FIG. 33 (A) is a timing chart showing the operation mode of the solid-state image sensor, and FIG. 33 (B) is a timing chart showing the timing of internal illumination light. Figure (C>) is a timing chart showing the timing of external illumination light.

As shown in FIG. 31, the electronic endoscope 300 has an insertion section 2
07, an imaging lens 301 and a solid-state imaging probe 30 disposed at the imaging position of the imaging lens 301.
2. Furthermore, a light guide 303 that transmits internal illumination light emitted from the distal end portion 210 is inserted into the insertion portion 207 .

On the other hand, the control device 310 has a lamp 312 for internal illumination supplied with power by a power supply unit 311, and between this lamp 312 and the incident end of the light guide 303,
Rotary filter 31 rotationally driven by motor 313
4, and a diaphragm device 315 that controls the light incident on the light guide 303 and limits the amount of internal illumination light.

The rotary filter 314, as shown in FIG.
3 types of filters that transmit light in each wavelength range of , G, and B
14R, 314G, and 314B are arranged along the circumferential direction. Each filter 314R, 314G, 314B
A light shielding section 316 is provided between them. Moreover, each filter 314R.

Markings 317, which are portions with different reflectances, indicating the positions of 314G and 314B, are provided.

Then, a rotary filter encoder 319 detecting this marking 317 detects each filter 314R, 31
The positions of 4G and 314B are detected.

The light emitted from the lamp 312 is separated in time series into light in the RoG and B wavelength regions by the rotary filter 314, and is made to enter the light guide 303.

This illumination light is then irradiated onto living tissue from within the body.

In addition, in this embodiment, the power supply unit 3 is used as a light source for external illumination.
A strobe lamp 320 is provided, powered by 21. The power supply unit 321 includes a synchronization circuit 322 that generates the timing of light emission of the strobe lamp 320.
is connected.

The output of the rotary filter encoder 319 is input to the synchronization circuit 322, and the synchronization circuit 322 is connected to each filter 314R, 314G, 3 of the rotary filter 314.
The timing for causing the strobe lamp 320 to emit light is generated from the position signal 14B.

Further, a timing generator 324 is provided that generates timing for the entire system and a synchronization signal between each circuit, and the motor 313 is driven by a motor driver 325 in synchronization with the synchronization signal generated by the timing generator 324. Rotation is now controlled.

Further, a driver 327 is provided that drives the solid-state imaging device 302 in synchronization with the synchronization signal generated by the timing generator 324, and the output signal of the solid-state imaging device 302 driven and read by this driver 327 is as follows: After being amplified by the preamplifier 329, the process circuit 33
0, and signal processing such as waveform shaping and γ correction is performed. The output signal of this professional wrestling circuit 330 is converted into a digital signal by an A/D converter 331. The output signal of this A/D converter is transmitted via a switch circuit 332 to memories 333R and 333G that store images generated by each of R, G, and B illumination lights.
, 333B. That is, the video signals read out in time series from the solid-state HD image element 302 corresponding to each of the R, G, and B illumination lights are as follows:
Memories 333R are distributed by the switch circuit 332 and correspond to R, G, and B, respectively.

333G and 333B. The signals read from each of the memories 333R, 333G, and 333B are converted into analog video signals by a D/Δ converter 334, and input to a matrix circuit 335. This matrix circuit 335
generates a color difference signal from each of the R, G, and B video signals, and this color difference signal is input to an encoder 336, which converts the color difference signal into, for example, an NTSC video signal. ing. The video signal from this encoder 336 is input to the monitor 206, and the observed image is displayed.

Further, the output of the encoder 336 is input to a band pass filter 337, and this band pass filter 337
In the NTSC signal output from the encoder 336, the 3.58 MHz color signal component is passed through to detect the chroma signal. The video signal output from the process circuit 330 and the chroma signal detected by the bandpass filter 337 are input to a level detection circuit 338, and the level of the chroma signal is detected by the level detection circuit 338. It has become so. The level detection circuit 338 controls the power supply section 321 and the aperture device 315 according to the level of the detected chroma signal, and controls the amount of external illumination light and the amount of internal illumination light.

In this embodiment, the internal illumination light emitted from the lamp 312 is passed through the rotary filter 314 as shown in FIG. 33(B).
The light is separated in time series into light in the R, G, and B wavelength ranges, and is emitted from the tip of the endoscope 300 via the light guide 303 to illuminate mucosal tissues and the like from within the body. on the other hand,
The strobe lamp 320 emits light with the same spectral characteristics, for example, white light, at all the timings of R, G, and B of the internal illumination light, as shown in FIG. 33(C), according to the timing generated by the synchronization circuit 322. (W) is emitted as external illumination light.

The solid-state image sensor 302 of the endoscope 300 is shown in FIG. 33(A).
As shown in , receiving light from the observation site using the internal illumination light and external illumination light, photoelectrically converting it to accumulate signal charges, and synchronizing the accumulated signal charges with switching of the internal illumination light, If the incline transfer method is used, the data is transferred to the vertical transfer path, and if the frame transfer method is used, the data is transferred to the storage unit.

The output signal of the solid-state image sensor 302 is sent to a preamplifier 32.
9, and the process circuit 330 performs waveform shaping and γ
After the correction, it is converted into a digital signal by the A/D converter 331, and the signal is sent to each memory 333R, 333G, 333B.
is memorized. This memory 333R, 333G, 333
B are read out at the same time, and each D/A converter 3
34, it is converted into an analog signal and sent to the matrix circuit 33.
5, a color difference signal is generated. This color difference signal is converted into an NTSC signal by an encoder 336.

This NTSG signal is then input to the monitor 206, and the observed image is displayed on the monitor 207.

In this embodiment, the image reflected by the internal illumination light is displayed as a color image, and the transmitted image by the external illumination light is displayed as a monochrome image. Therefore, the ratio between the reflected image and the transmitted image can be detected based on the chroma level.

In this embodiment, the bandpass filter 337 detects only the 3.58 MHz signal component, which is a chroma signal, among the NTSC signal components output from the encoder 336. Further, the overall exposure level is detected from the process circuit 330, and the chroma level that accounts for the entire exposure amount is detected by the level detection circuit 338. The level detection circuit 338 controls the power supply section 321 and the aperture device 315 according to the level of the detected chroma signal, and controls the amount of external illumination light and the amount of internal illumination light.

Note that the strobe lamp 320 for external illumination does not emit light at all the timings of R, G, and B for internal illumination;
, G, and B, the ratio of the reflected image to the transmitted image can be detected by changing the hue.

For example, by emitting external illumination light at G or B timing, a change in color tone is caused in an endoscopic image in which the R component accounts for a large proportion, and the level detection circuit 338 is used as a hue detection circuit. By changing not only the chroma level but also the hue, it is possible to detect the level of the image by external illumination light and the image by internal illumination light, and the ratio thereof.

In this manner, in this embodiment, the ratio between the reflected image and the transmitted image can be detected based on changes in the chroma level and hue, and the reflected image and the transmitted image can be visually distinguished.

34 to 36 relate to the 23rd embodiment of the present invention, FIG. 34 is a block diagram showing the configuration of the endoscope device, and FIG.
5 is an explanatory diagram showing the rotary filter, FIG. 36(A) is a timing chart showing the rotation timing of the rotary filter, and FIG. 36(B) is a timing chart showing the output of the rotary filter encoder. 36(C) is a timing chart showing the light emission timing of the strobe lamp, and FIG. 36(D) is a timing chart showing the operation mode of the solid-state image sensor.

In this embodiment, the rotary filter 31 in the 22nd embodiment
4, a rotating filter 34 as shown in FIG.
1 is provided. This rotary filter 341 has R,
Three types of filters 34 that transmit light in each wavelength region of G and B
1R, 341G, and 341B are arranged along the circumferential direction, and a light shielding part 342 is provided between each filter 341R, 341G, and 341B, and the filter 341
A light shielding portion 3-42 between B and the filter 341R is formed longer than other light shielding portions. In addition, each filter 341
Markings 343 are provided, which are parts with different reflectances indicating the positions of R, 341G, and 341B, and
Light shielding part 34 between filter 341B and filter 341R
2, a marking 344 is provided to indicate the timing at which the strobe lamp 320 emits light. and,
These markings 343, 344 are adapted to be detected by a rotary filter encoder 319. This rotary filter encoder 319 is synchronized by a synchronization circuit 322 so that a level detection circuit 328 can detect the levels of R, G, and B images of internal illumination light and images of external illumination light of a strobe lamp 320. In addition to outputting a signal, the light emission timing of the strobe lamp 320 is also generated.

In addition, in this embodiment, the memory 33 corresponding to R, G, and B
In addition to 3R, 333G, 333B, strobe lamp 32
Memory 333 for storing a transmitted image by external illumination light of 0
S is provided, and the signal from the A/D converter 331 is
By the switch circuit 346, the memories 333R, 3
It can be divided into 33G, 333B, and 3338.

The signal read from the memory 333S is converted into an analog signal by a D/A converter 334, and this signal and the video signal output from the encoder 336 are input to a switch circuit 347. . This switch circuit 347 is configured to select one of the output signal of the encoder 247 and the output signal of the memory 333S and output it to the monitor 206 by a switching operation from the outside.

Further, in this embodiment, instead of the level detection circuit 328 in the 22nd embodiment, R, G,
A level detection circuit 348 is provided to detect the level of image reliability corresponding to each illumination light in synchronization with a signal indicating the position of each filter 341R, 341G, 341B of B and a signal indicating the emission timing of the strobe lamp 320. ing.

The other configurations are the same as those of the twenty-second embodiment.

In this embodiment, the light emitted from the lamp 312 for internal illumination is converted into light in the R, G, and B wavelength regions in time series by the rotating filter 341, as shown in FIG. 36(A). It is separated into two parts and irradiated from inside the body to the observation area.

On the other hand, according to the timing of the flash emission of the strobe lamp 320, which is the output of the rotary filter encoder 319 as shown in FIG. As shown in (C), external illumination light is emitted from the strobe lamp 320.

The solid-state image sensor 302, as shown in FIG. 36(D),
Observation images corresponding to R, G, B, and flash light are respectively captured, and each image corresponding to R, G, B, and flash light read out in time series from the solid-state image sensor 302 is as follows.
The signals are distributed by the switch circuit 346 and stored in the memories 333R, 333G, 333B, and 3338, respectively.

The signals read from the memories 333R, 333G, and 333B are sent to the D/A converters 334. Matrix circuit 335. The signal read from the memory 333S is input to the switch circuit 347 as NTSC (l) through the encoder 336.
/A converter 334 and is input to switch circuit 347 as an analog monochrome video signal. This switch circuit 347 selects one of the output of the encoder 247 and the signal from the memory 333S and outputs it to the monitor 306 by a switching operation from the outside.

Therefore, when the output of the encoder 247 is input to the monitor 206, a normal color image based on internal illumination light is displayed, and when the signal from the memory 333S is input to the monitor 206, it is an external illumination light. The image transmitted by the light from the strobe lamp 320 is displayed in monochrome.

In addition, by obtaining the reflected images of R, G, and B internal illumination light and the transmitted image of the strobe lamp 320 individually in one field or one frame, the output signal of the synchronization circuit 322 can be adjusted. In synchronization, the level detection circuit 348 detects the signal level of the transmitted image based on the output signal level of the solid-state image sensor 302 during flash emission, and detects the output signal of the solid-state image sensor 302 during R, G, and B internal illumination. The signal level of the reflected image is detected based on the level.

37 to 41 relate to the 24th embodiment of the present invention, FIG. 37 is a block diagram showing the configuration of the endoscope apparatus, and FIG.
FIG. 8 is an explanatory diagram showing the rotary filter, FIG. 39 is a block diagram showing the configuration of the synchronous circuit, FIG. 40 (A) is a timing chart showing the rotation timing of the rotary filter, and FIG.
FIG. 40 (B) is a timing chart showing the start pulse of the rotary filter encoder, FIG. 40 (C) is a timing chart showing the read pulse of the rotary filter encoder, FIG. 40 (D> is a timing chart showing the output of the synchronous circuit, FIG. 40(E) is a timing chart showing the operating mode of the solid-state @ image element, FIG. 41(A) is a timing chart showing the operating mode of the solid-state imaging probe, and FIG.
B) is a timing chart showing the emission timing of the internal illumination light, and FIG. 41(C) is a timing chart showing the emission timing of the external illumination light.

As shown in FIG. 37, the endoscope 1350 of this embodiment includes an imaging lens 351 that collects light from a subject and forms an image at the distal end 210, and the light that is focused by the imaging lens 351. a half mirror 352 that separates the image into two directions; a solid-state image sensor 353 disposed at an imaging position on one optical path separated by the prism 352; A strobe lamp 32 is provided.
The light-receiving element 354 detects the light interval due to zero. The other configuration of the endoscope 1i350 is the same as that of the 16th embodiment.

On the other hand, the control device 360 has a rotary filter 361 that is substantially similar to the rotary filter 314 in the control device 310 shown in the twenty-second embodiment. This rotating filter 361 is
Three types of filters 3148, 314G and 314B that transmit light in each wavelength region of RlG and B, not shown in FIG.
are arranged along the circumferential direction. Each filter 31
A light shielding section 316 is provided between 4R, 314G, and 314B. Moreover, each filter 314R, 314G.

A marking 362 for read pulses such as reflectance is provided at the end of the opening 314B.

Further, a marking 363 for a start pulse is provided at the position where the opening of the filter 314R starts. These markings 362 and 363 are detected by a rotary filter encoder 319, and a start pulse and a read pulse synchronized with each R, G, and B exposure period are input to a synchronization circuit 365.

The level detection circuit 338 also includes the light receiving element 354.
and the video signal from the process circuit 330 are input, and from these input signals, the level detection circuit 338 determines the exposure level of each R, G, and B illumination light and the exposure level of the flash light of the strobe lamp 320. level and
Detection is performed in synchronization with the output pulse of the synchronization circuit 365. This level detection circuit 338 controls the power supply unit 321 for external illumination and the aperture device 315,
The amount of external illumination light and the amount of internal illumination light are controlled.

The synchronization circuit 365 is configured as shown in FIG. 39. That is, the rotary filter encoder 319
A counter 366 that is reset by a start pulse from and counts read pulses, and this counter 3
A timer (1) 367a that delays the read pulse by Tω1 when the count number of 66 is 1, and the counter 3
a timer (2) 367b that delays the read pulse by Tω2 when the count number of 66 is 2; and the counter 3
A timer (3) 367c that delays the read pulse by Tω3 when the count number of 66 is 3, and each timer v3.
It is provided with an OR gate 369 into which the output pulses of 67a, 367b, and 367c are inputted via switches 368, respectively.

The output of the OR gate 369 is input to the level detection circuit 338.

In this embodiment, the light emitted from the lamp 312 for internal illumination is converted into light in the R, G, and B wavelength ranges in time series by the rotating filter 361 as shown in FIG. 40(A). is separated and irradiated from inside the body to the observation site.

The marking 363 for the start pulse and the marking 362 for the lead pulse of the rotary filter 361 are detected by the rotary filter encoder 319, and from this encoder 319, the markings shown in FIGS. 40(B) and 40(C) are detected. A start pulse and a read pulse synchronized with each of the R, G, and B exposure periods are input to the synchronization circuit 365. This synchronization circuit 365 counts each read pulse corresponding to R, G, and B with a counter 366, and as shown in FIG.
7c, R read out from the encoder 319
, G, and B are respectively Tω1.
Tω2. The signal is delayed by Tω3 and output to the level detection circuit 338 and power supply section 321. The power supply section 321 synchronizes with the delayed read pulse from the synchronization circuit 365.
The strobe lamp 320 is made to emit light. The level detection circuit 338 also detects the light receiving element 354 of the endoscope 1350 in synchronization with the delayed read pulse from the synchronization circuit 365.
The amount of light from the strobe lamp 320 is detected from the output. Note that this level detection circuit 338 is similar to the synchronization circuit 3.
When the delayed read pulse from 65 is not input, R, G
, B is detected.

Note that, as shown in FIG. 40(E), the strobe lamp 320 has completed the transfer of the signal charge of the solid-state image sensor 353 of the endoscope 11' 1350, and the transfer of the signal charge of the solid-state image sensor 353 of the endoscope 11' 1350 has been completed, and that of the filters 314R, 314G, and 314B of the rotary filter 361 has been completed. It is designed to emit light before the opening begins. The solid-state image sensor 3
53, as shown in FIG. 40(E), photoelectrically converts the observation image of R, G, and B internal illumination light and the observation image of external illumination light of the strobe lamp 320, and accumulates signal charges. . The reflected image by the internal illumination light and the transmitted image by the external illumination light are combined and displayed on the monitor 206.

As described above, according to this embodiment, the light source for external illumination is a flash light, and by detecting the amount of exposure when the flash is emitted, the exposure level of the reflected image and the exposure level of the transmitted image can be detected. Can be done.

Further, as shown in FIG. 41 (A) to C), the strobe lamp 320 is made to emit light during each of the R, G, and B illumination periods that are the internal illumination light, and the timing of the light emission of the strobe lamp 320 is , the level detection circuit 338 may detect the exposure level of the transmitted image. In this case, the amount of light from the internal illumination light and the light m from the external illumination light are not clearly separated, but the flash light from the strobe lamp 320 is much more sensitive than the R, G, and B internal illumination lights. Since the incoming light M is emitted within a short light emission time, the influence of internal illumination light can be almost ignored, and by considering the amount of exposure when this flashlight is emitted as the amount of exposure due to external illumination light,
The amount of exposure due to internal illumination light and the amount of exposure due to external illumination light can be detected.

FIG. 42 is a block diagram showing the configuration of an endoscope apparatus according to a twenty-fifth embodiment of the present invention.

The endoscope 370 of this embodiment has a half prism 352. Instead of providing the light receiving element 354, the incident end side of the light guide 303 is branched into two parts, and one branch part 303a is placed on the illumination optical path of the lamp 312 as a light guide for internal illumination, and the other branch part 303a is placed on the illumination optical path of the lamp 312 as a light guide for internal illumination. Part 3
03b is used to measure the amount of light at the observation site.
For example, it is arranged so as to face a light receiving cable 371 provided in the control device 360. The lamp 312
The light emitted from the light guide 303 enters one branch portion 303a of the light guide 303, and is emitted from the tip portion 210 via the light guide 303. A part of the light from the observation site by the internal illumination light or the external illumination light enters the light guide 303, is emitted from the end of the other branch part 303b, and is received by the light receiving element 371. The output of the light receiving element 371 is input to a level detection circuit 338, and the level detection circuit 338 detects the exposure level of the external illumination light.

The other operations and effects of the configuration 9 are the same as those of the 24th embodiment.

Note that an optical fiber for measuring the amount of light at the observation site may be inserted into the treatment instrument channel of the endoscope 370, and the light amount may be measured by the light receiving element 371 via this optical fiber.

FIG. 43 is a block diagram showing the configuration of an endoscope apparatus according to a twenty-sixth embodiment of the present invention.

This embodiment has substantially the same configuration as the 21st embodiment.

The control device 380 of this embodiment includes a reference level setting circuit 381 that sets an exposure reference level, two attenuators 382 and 383 that attenuates the reference level set by the reference level setting circuit 381, and a level detection circuit 281.
Compare the exposure level of the internal illumination light outputted from the attenuator 382 with the reference level outputted from the attenuator 382,
A comparator 384 that provides a control signal to the control circuit 256 of the light source device 255 for internal illumination, and similarly to this comparator 384, the exposure level of the external illumination light output from the level detection circuit 282 and the attenuator 383 The comparator 385 provides a control signal to the control circuit 254 that controls the external illumination light by comparing it with a reference level output from the control circuit 254 .

Further, a counter 387 is provided that divides and counts the vertical synchronization signal generated by the timing generator 246, and also increases or decreases the amount of attenuation of the attenuators 382 and 383. A switch 388 that is turned on and off by external operation is interposed between the counter 387 and the timing generator 246, and the counter 387 has a count number setting that changes the frequency division amount of the counter 387. A circuit 389 is connected.

Incidentally, from the counter 387 to the attenuator 382°38
The signals input to 3 are signals that increase and decrease the amount of attenuation in opposite directions.

The other configurations are the same as the 21st practical example.

In this embodiment, a reference level setting circuit 381 sets a reference value for the exposure level.

When the switch 388 is turned on by an external operation, the vertical synchronization signal from the timing generator 246 is input to the counter 387.
7, signals are input to attenuators 382 and 383 once every integer multiple of the vertical synchronization signal according to the frequency division amount set by the count number setting circuit 389. The signals from the counter 387 are signals that increase and decrease the amount of attenuation in opposite directions, and as shown in FIG. 23, the overall light reception level is constant and the ratio of external illumination light to internal illumination light is constant. The attenuation amount of the attenuators 382 and 383 is adjusted so as to be changed.

The attenuators 382 and 383 output signals set to respective reference levels and respective level detection circuits 281 and 2.
The signals with 82 are compared by comparators 384 and 385,
Each control circuit 256, 25 is set to the same level as the reference level set by the attenuators 382 and 383.
4 is controlled, and the light intensity of the internal illumination light and the external illumination light is adjusted. Therefore, as shown in FIG. 23, the ratio of the amount of exposure due to internal illumination light to the amount of exposure due to external illumination light is changed.

Note that the counter 387 is set by the count number setting circuit 389.
By changing the frequency division amount, it is possible to arbitrarily set the time (speed) at which the ratio changes.

On the other hand, when the switch 388 is turned off by an external operation, the vertical synchronization signal from the timing generator 246 is not input to the counter 387, so the ratio of the amount of exposure due to internal illumination light to the amount of exposure due to external illumination light is is retained.

As described above, according to the present embodiment, the ratio of the amount of exposure due to internal illumination light and the amount of exposure due to external illumination light can be automatically changed at an arbitrary speed, and can be maintained at an arbitrary ratio. Can be done.

Other functions and effects are similar to those of the 21st embodiment.

FIG. 44 is a block diagram showing the configuration of an endoscope apparatus according to a twenty-seventh embodiment of the present invention.

This embodiment has substantially the same configuration as the 16th embodiment.

In this embodiment, the output of the video signal processing circuit 216 is input to a reflected image memory 391 and a transmitted image memory 392. The control unit 223 also controls the exposure m control circuit 2.
22 and a light emission signal generation circuit 393.

The light source 217 for internal illumination and the light source 203 for external illumination alternately emit light as shown in FIGS. 22(A) and 22(B), for example, in response to a light emitting signal from the light emitting signal generating circuit 393. Therefore, the solid-state R element 212 alternately captures reflected images and transmitted images. Similarly to the sixteenth embodiment, the signal level detection circuit 215 detects the signal level of the anti-[1 and transmitted image signals from the output signal of the solid-state image sensor 212, and the level of this signal is determined by the exposure m
is input to the control circuit 222, and this exposure m control circuit 222
Accordingly, the light emission levels of the internal illumination light source 217 and the external illumination light source 203 are controlled.

On the other hand, the video signal processing circuit 216 alternately outputs a video signal of a reflected image and a video signal of a transmitted image in response to switching between internal illumination and external illumination. The reflected image memory 391 and the transmitted image memory 392 are rewritten by the synchronization signal output from the light emission signal generation circuit 393, and the reflected image memory 391 stores only the reflected image, and the transmitted image memory 392 stores only the transmitted image. It is supposed to be done.

According to this embodiment, if the internal illumination and external illumination are switched for a short time, for example, every field or every frame, the ratio of the exposure amount of the internal illumination light and the internal illumination light can be changed as in the 16th embodiment. It is possible to control the exposure amount, maintain the ratio of the exposure amount at a predetermined ratio, switch between internal illumination light and external illumination light, and control the exposure amount of each. This makes it possible to record Therefore, during playback, it is possible to change the ratio of exposure m between internal illumination light and internal illumination light, maintain the ratio of this exposure amount at a predetermined ratio, or switch between internal illumination light and external illumination light, and change each exposure. It becomes possible to control the amount. Furthermore, image processing using transmitted images and reflected images of the same region becomes easier.

Other functions and effects of the configuration 1 are the same as those of the 16th embodiment.

In the 16th to 27th embodiments, in order to visually separate the reflected image and the transmitted image, for example, as in the 22nd embodiment, the reflected image is displayed as a color image and the transmitted image is displayed as a monochrome image. , the reflected image may be displayed in one of R, G, and B or its complementary color, or the reflected image and the transmitted image may be displayed in different colors.

Further, the ratio information of the reflected image and the transmitted image detected by the signal level detection circuit 215 or the like may be superimposed on the video signal and displayed or recorded.

Further, the internal illumination light and the external illumination light are not limited to visible light or infrared light, but may also be ultraviolet light, and the combination thereof can be arbitrarily selected depending on the observation site, observation purpose, and the like.

In the above-mentioned 16th to 27th embodiments, if a solid-state image sensor is used as the imaging means, various methods may be used in which the illumination light is switched between R, W (white), B, etc. in a frame sequential manner. Alternatively, a single-chip system may be used in which a color filter is placed in front of a solid-state image sensor.

In addition, as shown in the fourth to sixth embodiments, it is not limited to the one using a solid-state image sensor, and as shown in the fourth to sixth embodiments, an image can be transmitted by an image guide, and the transmitted image can be directly observed with the naked eye or as desired. Examples 7 and 8 include those observed with a television camera sensitive to the wavelength range of
As shown in Example 1, recording may be performed using a normal film or an infrared film provided in the distal end of the endoscope insertion section, or a combination thereof.

As described above, according to the 16th to 27th embodiments, the exposure method controls the respective exposure amounts of the illumination light irradiated into the living body through the living tissue and the illumination light irradiated from the inside of the living body into the living body. By providing a control means, it is possible to control the ratio of the transmitted image of the illumination light that passes through the living tissue and the reflected image of the internal illumination light, making it possible to obtain the optimal image for the observation site and observation purpose. effective.

FIGS. 45 and 46 relate to the 28th embodiment of the present invention,
FIG. 45 is a block diagram showing the configuration of a family celebration'mi a,
46(A) is a timing chart showing the operation mode of the solid-state image sensor, FIG. 46(B) is a timing chart showing a flash signal, and FIG. 46(C) is a timing chart showing the emission timing of external illumination light. - Fig. 46 (D) is a timing chart showing changes in internal illumination light;
46(E) is a timing chart showing the switching timing of the switch circuit 424, FIG. 46(F) is a timing chart showing the switching timing of the switch circuit 428, and FIG. 46(G) is a timing chart showing the switching timing of the switch circuit 428. FIG. 46 (H) is a timing chart showing the operation mode, and FIG. 46(H) is a timing chart showing the emission timing of the external illumination light.

As shown in FIG. 45, the endoscope device 401 of this embodiment has an electronic endoscope 402 connected to the rear end side of the electronic endoscope 402, and an internal light source section 403 and a signal processing section 40.
4 and is provided with an external light source section 406, and a video signal output from the endoscope control device 407 is inputted as a display means for displaying an endoscopic image. monitor 408.

The electronic endoscope 1402 has an elongated insertion section 410 that can be inserted into a living body 409, and a light guide 411 that transmits illumination light and emits it from the distal end surface is inserted into the insertion section 410. ing.

The internal light source section 403 supplies power from the light source lighting device 412 to the lamp 413 to cause the lamp 413 to emit light, and transmits the emitted white light through the aperture 414 to enter the incident end surface of the light guide 411. It is designed to irradiate focused light.

The extracorporeal light source section 406 includes a power supply section (not shown) that supplies electric power to emit flash light, and a light emitting section 4 that emits flash light using this power source and includes, for example, a strobe lamp.
It consists of 16.

The reflected light and transmitted light from the living body 409 illuminated internally and externally form an image by an objective lens 417 on an imaging surface of a solid-state imaging device 418 such as a COD as an imaging means. This solid-state image sensor 418 is configured to photoelectrically convert an optical image formed on its imaging surface, and when a solid-state image sensor drive signal is applied from a driver circuit 419, the solid-state image sensor 418 performs photoelectric conversion. output the image signal. This image signal is transmitted to the preamplifier 421
and input to the process circuit 422.

A control signal is applied to the driver circuit 419 from a synchronization circuit 423 that generates a timing signal for the entire endoscope apparatus 401, which determines the timing of outputting a solid-state image sensor drive signal.

The process circuit 422 adjusts the color tone of the image data input from the preamplifier 421, performs γ correction, converts it into a video signal, and sends it to the switch circuit 42 as a selection means.
Output to 4. Further, by controlling the aperture 414, the brightness inside the living body 409 due to internal illumination can be adjusted.

The switch circuit 424 is connected to the system control section 4
26, the video signal is selected and outputted to a memory device @427 as a recording means consisting of a frame memory etc. for recording the video signal, and a switch circuit 428 as a selection means, and the video signal is output to the memory device 427. can be written. Furthermore, the switch circuit 428
The system controller 426 can select whether to read out the video signal stored in the memory device 427 or directly output the video signal output from the process circuit 422 to the monitor 408 using a control signal from the system control unit 426.

The system control section 426 includes a synchronization circuit 423
The lamp 41 of the light source lighting device 412 is applied with a timing signal from the outside and a flash signal from the outside.
After reducing the power supplied to the memory device 427 and switching the switch circuit 424 to the writing side to the memory device 427, the light emitting unit 416 is intermittently turned on to emit light, and the memory device 427 is now able to record a transmitted image by external illumination. There is. Furthermore, in response to an external transmission image ON signal, the switch circuit 428 is switched to the readout tower of the memory device 427 so that the recorded transmission image can be output to the monitor 408.
The OFF signal increases the power supplied by the light source lighting device 412 and switches the switch circuits 424 and 428 so that a reflected image reflected within the living body 409 by the internal illumination can be output to the monitor 408.

The operation of this embodiment configured in this way will be explained below with reference to FIG. 46.

The light emitted by the lamp 413 provided in the internal light source section 403 passes through the aperture 414 and passes through the light guide 41.
1 and illuminates the inner wall surface of the living body 409. The light irradiated into the living body 409 is focused as a reflected image on the imaging surface of the solid-state imaging device 418, and is accumulated and transferred in synchronization with a timing signal as shown in FIG. 46(A). The transferred image signal as a reflected image is amplified by a preamplifier 421, adjusted in color tone and γ-corrected by a process circuit 422, and then converted into a video signal and sent to the monitor 4 via switch circuits 424 and 428.
08, and the reflected image can be displayed on the monitor 408.

As shown in FIG. 46(B) 1, when a flash signal from the outside is input to the system control unit 426, the internal illumination is turned off or the light is narrowed down as shown in FIG. 46(D). As shown in FIG. 46(E), the switch circuit 424 switches in the next frame, and the memory device 427 enters the writing state for one frame period. Then, within this frame, as shown in FIG. 46(C), external illumination is emitted for each field, and a transmitted image is written in the memory device 427. That is, the light emitting unit 416 is activated before and after the V blanking period within one frame period of the solid-state image sensor 418 driven in the field readout mode.
Lights up twice intermittently.

When the occupancy is completed, the ON signal of the transparent image causes the fourth
As shown in FIG. 6(E), the switch circuit 424 switches and the memory device 427 becomes write-inhibited, and at the same time, as shown in FIG. In the reading state, a transparent image can be displayed on the monitor 408. Furthermore, as shown in FIG. 46(D), the internal illumination is turned on or the amount of light is increased, illuminating the inside of the living body 409.

After a certain period of time, the switch circuit 428 is switched by the OFF signal of the transmitted image, and the reflected image due to the internal illumination is displayed on the monitor 408.

According to this embodiment, since the transmitted image is recorded in the memory device 427, it can be displayed on the monitor 408 for a desired period.
The 0B screen does not flicker, the total energy Q irradiated to the living body 409 is minimized, and a transmitted image of the living body 409 with the required thickness is obtained by 1q.

Further, the display period of the transmitted image may be set to an arbitrary fixed period and automatically switched to the reflected image by internal illumination, or the observer may manually perform the display after sufficient observation. Furthermore, regarding the timing of the flash, after sufficient observation is made using internal illumination, the light is emitted to areas deemed necessary to obtain a transmitted image.

As shown in FIGS. 46(G) and 46(H), the solid-state image sensor 418, which is being driven in the field readout mode, is read out only for the frames in which the light emitting unit 416 emits light, and one readout is performed. A transparent image for one screen may be obtained by emitting light.

Furthermore, the memory device 427 may be a magnetic recording means.

FIGS. 47 and 48 relate to the 29th embodiment of the present invention,
Fig. 47 is a block diagram showing the configuration of the endoscope device, Fig. 48
48(A) is a timing chart showing the operation mode of the solid-state image sensor, FIG. 48(B) is a timing chart showing the flash signal, FIG. 48(C) is a timing chart showing the display image of the monitor, and FIG. D) is a timing chart showing the emission timing of external illumination light, FIG. 48(E) is a timing chart showing changes in internal illumination light,
FIG. 48(F) is a timing chart showing the switching timing of the memory write operation, and FIG. 48(G) is a timing chart showing the switching timing of the memory reading operation.

As shown in FIG. 47, the endoscope device 431 of this embodiment has an electronic endoscope [432] connected to the rear end side of the electronic endoscope 432, an internal light source section 433, and a signal processing section 434.
an endoscope control device 437 which is equipped with a built-in external light source section 436; 438.

The electronic endoscope 432 has an elongated insertion section 410 so that it can be inserted into a living body 409, and a light guide 41 that transmits illumination light and emits it from the distal end is inserted into the insertion section 410. has been done.

The internal light source unit 433 supplies power from a light source lighting device 442 to a lamp 443 to cause it to emit light, and transmits the emitted white light through a rotary filter 440 that is rotationally driven by a motor 439, thereby converting it into red and green lights.

After the blue color is sequentially illuminated, the incident end surface of the light guide 441 is condensed and irradiated.

The extracorporeal light source section 436 includes a power supply section (not shown) that supplies electric power to emit flash light, and a light emitting section 4 that emits flash light using this power source and includes, for example, a strobe lamp.
It consists of 46.

The reflected light and transmitted light from the living body 409 illuminated internally and externally form an image by an objective lens 447 on an imaging surface of a solid-state image sensor 448 serving as an imaging means. This solid-state II image element 448 photoelectrically converts the optical image formed on its imaging surface, and the driver circuit 449
By applying a solid-state image sensor drive signal from the solid-state image sensor 448, the solid-state image sensor 448 outputs a photoelectrically converted image signal. This image signal is amplified by a preamplifier 451 and input to a process circuit 452.

A control signal is applied to the driver circuit 449 from a synchronization circuit 453 that generates a timing signal for the entire endoscope apparatus 431, which determines the timing at which the solid-state image sensor drive signal is output. This synchronous circuit 453
a motor driver 44 that applies a motor drive signal to 9;
4, a control signal that determines the timing to drive the motor 439 is applied.

The process circuit 452 performs signal processing such as white balance and γ correction on the image signal input from the preamplifier 451, converts it into three primary color signals of RGB, and outputs the signal to a switch circuit 454 as a selection means.

The switch circuit 454 is connected to the system control unit 4
The RG[3 signal can be selectively written into the first memory circuit 457 and the second memory circuit 458, which are recording means such as a frame memory capable of recording one frame, by a control signal from the memory circuit 56.

Furthermore, this first memory circuit 457 and second memory circuit 45
The RGB signals written in 8 and 8 can be read by a switch circuit 459 that selects between the first memory circuit 457 and the second memory circuit 458 in response to a control signal from the system control section 456.

The system control section 456 includes a synchronization circuit 453
At the same time, the lamp 44 of the light source lighting device 442 is applied with a timing signal from the
After reducing the power supplied to the light emitting unit 44 and switching the switch circuit 454 to the write side of the second memory circuit 458,
6 is made to emit light intermittently, and the second memory circuit 458 can record a transmitted image obtained by external illumination. Furthermore, when an external image switching signal indicates a transparent image, the switch circuit 459 is switched to the readout side of the second memory circuit 458 so that the recorded transparent image can be output to the monitor 438, and the image switching The signal indicates the reflected image, thereby increasing the power supplied by the light source lighting device 442, and switching the switch circuit 454, 459 to the first
The memory circuit 457 side is connected to the living body 409 by internal illumination.
A reflected image reflected inward can be displayed on a monitor 438.

The operation of this embodiment configured in this manner will be explained below with reference to FIG. 48.

The light emitted by the lamp 443 provided in the internal light source section 433 passes through the rotating filter 440 and is divided into red, green,
Blue color sequential illumination light is irradiated onto the incident end face of the light guide 441, illuminating the inner wall surface of the living body 409. living body 40
The light irradiated into the solid-state image sensor 9 is focused as a reflected image on the imaging surface of the solid-state image sensor 48, and is stored and transferred in synchronization with the timing signal as shown in FIG. 48(A). The transferred image signal as a reflected image is amplified by a preamplifier 451, and after signal processing such as white balance and γ correction is performed by a bus processing circuit 452, it is converted into three RGB signals.
The signal is converted into a primary color signal and output to the switch circuit 454.

The system control unit 456 switches between the switch circuit 454 and the switch circuit 459 in response to an image switching signal to alternately perform writing and reading. In other words, the reflected image of the internal illumination is stored in the first memory circuit 45.
During a period when writing is being performed in either one of the memory circuit 7 and the second memory circuit 458, one frame worth of video signals can be read out from the other memory circuit, and a reflected image can be displayed on the monitor 438.

As shown in FIG. 48(B), when an external flash signal is input to the system control unit 456, the internal illumination is turned off or the light is turned off as shown in FIG. 48(E).
is narrowed down, the switch circuit 454 is switched in the next frame, and the second memory circuit 45 is switched as shown in FIG. 48(F).
8 is in the writing state for one frame period. And the 48th
As shown in Figure (D), the external illumination is emitted within this frame, and the transmitted image is written into the second memory circuit 458. That is, the light emitting section 446 is caused to emit light three times intermittently before and after the (2) blanking period within one frame period of the solid-state image sensor 448 driven in the field readout mode.

When writing is completed, the switch circuit 459 is switched by an external image switching signal instructing a transparent image, and the second memory circuit 458 prohibits writing, as shown in FIGS. 48(F) and (G). and enters the read state, and the fourth
As shown in FIG. 8(C), a transparent image, which is a still image, can be displayed on the monitor 438, and
As shown in FIG. 48(E), the internal illumination is turned on or the light D increases, illuminating the inside of the living body 409.

After a certain period of time, the switch circuit 459 is switched in response to an external image switching signal instructing a reflected image, and the first memory circuit 457 and the second memory circuit 458 are stored and read, thereby creating a moving image due to internal illumination. A reflected image is displayed on the monitor 438.

According to this embodiment, since the light emitting unit 446 that provides external illumination emits light intermittently, the total irradiation energy of light to the living body 409 can be reduced, and a still image using transmitted illumination and normal observation using internal illumination can be Since it can be switched continuously, diagnostic ability can be improved and I! Since it is easier to confirm the detected area, operability can be improved. Furthermore, it becomes possible to suppress the thermal a(P given to the living body to a minimum), thereby improving safety.

Note that the timing for switching between the light emission of the light emitting unit and the transmitted image or reflected image can be determined by counting the number of frames and automatically emitting and switching, or manually by the observer depending on the area to be observed and the purpose. You can.

Furthermore, by adding one more memory circuit, the first memory circuit 457 and the second memory circuit 458 can be used exclusively for moving pictures using reflected illumination, and the images produced by transmitted illumination can be recorded as reflected images in the additional memory circuit. Even after observation,
It may also be possible to obtain a transmitted image recorded before observing the reflected image.

Furthermore, the light emission timing of the light emitting unit 446 is set to R and G.

By selecting any two colors or one color of B, and emitting internal illumination to some extent when the light emitting unit 446 emits light, the internal illumination image of normal color images and the internal illumination image of R, G, B can be displayed on the same screen.
Alternatively, transparent images displayed in complementary colors may be combined and displayed.

Furthermore, in both the 28th and 29th embodiments, still images and moving images may be displayed simultaneously on the same monitor or on multiple monitors.

In this way, in the 28th and 29th embodiments, images using internal illumination light suitable for observing unevenness and color tone differences on the surface of the mucous membrane, as well as the running of submucosal blood vessels and the infiltration range of the lesion, can be obtained. By making it possible to switch between transmission images and transmission images that allow observation of the V, it is possible to continuously observe and improve the V diagnostic ability. In addition, since the light emitting part emits light intermittently, the total irradiation energy irradiated to the living body is 1! - is suppressed to a minimum, safety is improved, and since there is no need to emit light continuously, it is possible to easily downsize the device.

[Effects of the Invention] As explained above, according to the present invention, the inside of the tissue can be easily observed using the light that has passed through the living tissue, and an optimal image can be obtained depending on the observation site and observation purpose. It has the effect of being able to

[Brief explanation of the drawing]

1 and 2 relate to a first embodiment of the present invention, FIG. 1 is an explanatory view showing the configuration of an endoscope device, and FIG. 2 is an explanatory view showing the tip of an electronic endoscope. , FIG. 3 is an explanatory diagram showing an electronic endoscope according to a second embodiment of the present invention, FIG. 5 and 6 relate to the fourth embodiment of the present invention, and FIG. ! FIG. 6 is an explanatory diagram showing the configuration of the mirror device, FIG. 6 is an explanatory diagram showing the distal end of the endoscope, FIGS. 7 and 8 relate to the fifth embodiment of the present invention, and FIG. 7 is the endoscope device. FIG. 8 is a sectional view showing the distal end of the endoscope, FIG. 9 is an explanatory view showing the structure of the endoscope apparatus according to the sixth embodiment of the present invention, FIGS. FIG. 11 relates to a seventh embodiment of the present invention, FIG. 10 is an explanatory diagram showing the configuration of an endoscope device, and FIG.
12 is an explanatory diagram showing the distal end of an endoscope, FIG. 12 is an explanatory diagram showing the distal end of an endoscope in the eighth embodiment of the present invention,
FIG. 3 is an explanatory diagram showing the configuration of an endoscope apparatus according to a ninth embodiment of the present invention, FIG. 14 is an explanatory diagram showing the configuration of an endoscope apparatus according to a tenth embodiment of the present invention, and FIG. FIG. 16 is an explanatory diagram showing the configuration of an endoscope apparatus according to the 11th embodiment of the invention, FIG. 16 is an explanatory diagram showing the configuration of the endoscope apparatus according to the twelfth embodiment of the invention, and FIG. Examples of family celebrations &! ? FIG. 18 is an explanatory diagram showing the configuration of an endoscopic vL device according to the 14th embodiment of the present invention, and FIG. 19 is an explanatory diagram showing the configuration of the endoscopic vL device according to the 15th embodiment of the present invention. Figures 1 to 23 relate to the 16th embodiment of the present invention, Figure 20 is an explanatory diagram showing the configuration of the endoscope, and Figure 21 is an illustration of the endoscope. Explanatory diagram showing the tip part, Fig. 22 (A> is the timing according to the emission timing of the internal illumination light) A7-T, Fig. 22 (B
) is a timing chart based on the emission timing of external illumination light, FIG. 23 is an explanatory diagram showing changes in the light reception level of internal illumination light and external illumination light, and FIG. 24 is J3 according to the 17th embodiment of the present invention. FIG. 25 is an explanatory diagram showing a solid-state mechanical element, and FIG. 25 shows the configuration of an endoscope apparatus according to an 18th embodiment of the present invention. For example, FIG. 26 is a block diagram showing the configuration of an endoscope device,
Fig. 27 (A) is a timing chart showing the output of the timing generator, Fig. 27 (B) is a timing chart showing the output S1 of the flip-flop, and Fig. 27 (
C) is a timing chart showing the output S2 of the flip-flop, FIG. 27(D) is a timing chart showing the output of the pulse generation circuit, FIG. 27(E) is a timing chart showing the output S1 of the flip-flop, FIG. (F
) is a timing chart showing the output S2 of the flip-flop, FIG. 28 is a block diagram showing the configuration of the endoscope apparatus according to the 20th embodiment of the present invention, and FIGS. 29 and 30 are the diagrams showing the structure of the 21st embodiment of the present invention. For example, FIG. 29 is a block diagram showing the configuration of an endoscope device, FIG. 30 is an explanatory diagram showing the distal end of the endoscope, and FIGS. 31 to 33 are a 22nd embodiment of the present invention. Accordingly, FIG. 31 is a block diagram showing the configuration of the endoscope device,
Figure 32 is an explanatory diagram showing a rotating filter, Figure 33 (A)
33(8) is a timing chart showing the timing of internal illumination light, FIG. 33(C) is a timing chart showing the timing of external illumination light, and FIGS. 36th
The figures relate to the 23rd embodiment of the present invention, Fig. 34 is a block diagram showing the configuration of the endoscope device, Fig. 35 is an explanatory diagram showing the rotary filter, and Fig. 36 (A> shows the rotation of the rotary filter). FIG. 36(B) is a timing chart showing the output of the rotary filter encoder.
FIG. 36(C) is a timing chart showing the light emission timing of the strobe lamp, FIG. 36(D) is a timing chart showing the operation mode of the solid-state image sensor, and FIG.
7 to 41 relate to the 24th embodiment of the present invention, FIG. 37 is a block diagram showing the configuration of the endoscope device, FIG. 38 is an explanatory diagram showing the rotary filter, and FIG. 39 is the Ig1 circuit of the same. 40 <A) is a block diagram showing the configuration of the J timing chart showing the rotation timing of the rotary filter.
Figure (B) shows the start pulse of the rotary filter encoder. - Fig. 40 (C) is a timing chart showing the read pulse of the rotary filter encoder, Fig. 40 (D) is a timing chart showing the output of the synchronous circuit, and Fig. 40 (E) is a timing chart showing the read pulse of the rotary filter encoder. FIG. 41 (A) is a timing chart showing the operation mode of the solid-state imaging cord; FIG. 41 (B) is a timing chart showing the emission timing of internal illumination light; FIG. C) is a timing chart showing the emission timing of external illumination light; FIG. 42 is a block diagram showing the configuration of an endoscope apparatus according to the 25th practical example of the present invention;
3 is a block diagram showing the configuration of an endoscope device according to the 26th embodiment of the present invention, FIG. 44 is a block diagram showing the configuration of the endoscope device according to the 27th embodiment of the present invention, FIGS. 46 relates to the 28th embodiment of the present invention, FIG. 45 is a block diagram showing the configuration of the internal view Q position, FIG. Figure (B
) is the timing chart showing the flash signal, No. 46
Figure 46 (C) is a timing chart showing the emission timing of external illumination light, Figure 46 (D) is a timing chart showing changes in internal illumination light, and Figure 46 (E) is the switch circuit 4.
46 (F) is a timing chart showing the switching timing of the switch circuit 428; FIG. 46 (G) is a timing chart showing the operation mode of the solid state @ pixel element; Figure (H) is a timing chart showing the emission timing of external illumination light, Figures 47 and 48 relate to the 29th embodiment of the present invention, Figure 47 is a block diagram showing the configuration of the endoscope device, 48(A) is a timing chart showing the operation mode of the solid-state image sensor, FIG. 48(B) is a timing chart showing the flash signal, FIG. 48(C) is a timing chart showing the display image of the monitor, and FIG. Figure 48 (D) is a timing chart showing the emission timing of external illumination light, Figure 48 (E) is a timing chart showing changes in internal illumination light, and Figure 48 (F) is the timing of switching the memory write operation. The timing chart shown in Fig. 48 (
G) is a timing chart showing the timing of switching the memory read operation. 1... Endoscopy device 2... Electronic endoscope 3...
External light source device 7... Monitor 10... Insertion section
13... Tip portion 14... Imaging optical system 15.
...Solid-state image sensor 23...Light source 28...
Video signal processing circuit Figure 3 Rinaga (nm) Figure 5 Figure 6 Figure 1 O Figure 11 Figure 12 1st line Figure 13 Figure 17 Figure 18 Figure 2 O

Claims (4)

[Claims] (1) An illumination means for irradiating illumination light including at least infrared light into the living body through the living tissue, an elongated insertion section inserted into the living body, and a light receiving section provided in the insertion section, and at least the infrared light an endoscope apparatus, comprising: a photographing means having a sensitivity to and photographing a subject image transmitted and illuminated by the illumination means. (2) An illumination means for irradiating illumination light in a wavelength range of red light or higher into the living body through the living tissue, an elongated insertion portion inserted into the living body, and a light receiving portion provided in the insertion portion, and the illumination means An endoscope apparatus comprising: an imaging device using a solid-state imaging device that captures an image of a subject that is transmitted and illuminated by a solid-state imaging device; (3) The first step is to irradiate the illumination light into the living body through the living tissue.
an elongated insertion section to be inserted into a living body; a second illumination section having a light emitting section provided in the insertion section and for irradiating illumination light from inside the living body to the living body; an exposure amount that controls at least one of the exposure amount of an imaging means provided in the insertion section and the exposure amount of the illumination light of the first illumination means and the exposure amount of the illumination light of the second illumination means to the imaging means; An endoscope device comprising a control means. (4) a first illumination means that can emit light or increase the amount of light intermittently and irradiates illumination light into the living body through the living tissue; an elongated insertion section that is inserted into the living body; and an emitting section that is connected to the insertion section. a second illumination means provided for irradiating illumination light from inside the living body to the inside of the living body; an imaging means having a light receiving section provided in the insertion section; and video signal processing of the output signal of the imaging means;
a signal processing means for visualizing a subject image; a storage means for storing an image formed by the illumination light of the first illumination means; an image formed by the illumination light of the first illumination means stored in the storage means; 2. An endoscope apparatus comprising display means capable of displaying an image produced by the illumination light of the second illumination means.