JPH03237966A - External fitted television camera for endoscope - Google Patents

Abstract

PURPOSE:To enhance resolving power and to use a white light source for obser vation with the naked eye by interposing a light splitting means splitting the luminous flux of an object into a plurality of ones within a wavelength region between a connection means allowing the luminous flux of the object to be incident to a solid-state imaging element and the solid-state imaging means. CONSTITUTION:A TV camera 1 is constituted of the connection part 22 con nected to the eyepiece part 13 of an endoscope 2 in a freely detachable manner and the camera part 23 provided in a video processor 4 and an RGB filter 42 having fillers respectively permitting the lights of red, green and blue wave length regions R, G, B to transmit arranged thereto, a motor 41 rotationally driving the same and a CCD 43 being a solid-state imaging element photoelectrically converting the luminous flux of an object formed into an image on a photoelectric conversion surface to output the same are provided to the camera part 23. The RGB filter 42 is interposed between an imaging optical system 37 and the CCD 43. The CCD 43 photoelectrically converts the luminous flux of the object in a time series manner to output the same to an image signal processor 64 and, for example, when R, G and B synchronized by a frame memory are at an equal image signal level, white light is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an external television camera for an endoscope with improved operability and resolution.

[Prior Art] In recent years, endoscopes (scopes or fiberscopes), which can diagnose and examine internal organs in body cavities by inserting their elongated insertion portions into body cavities, have become widely used. In addition, it is used not only for medical purposes but also for industrial purposes to observe and inspect objects inside pipes of boilers, machines, chemical plants, etc., or inside machines.

Furthermore, it is detachably attached to the eyepiece of this endoscope, captures the image of the subject transmitted from the tip of the endoscope, processes the signals resulting from this imaging, and makes it observable on a television monitor. As an external device for an endoscope, a television camera device has been proposed, for example, in Japanese Patent Application Laid-Open No. 63-229025.

The above-mentioned external TV camera for endoscopes uses a simultaneous imaging means using a mosaic color filter when the light source device supplies white light, and when using a frame-sequential imaging means, A light source device that can sequentially supply light is used.

[Problems to be Solved by the Invention] However, in televisions, the external endoscope using the mosaic color filter described above can use a light source device that supplies white light; There is a problem that the wavelength range to be imaged is determined by the mosaic color filter, and the number of cells used for the -wavelength range is small, resulting in a decrease in the resolution of the observation screen.

Furthermore, when a TV camera is used as an external device for a frame-sequential endoscope, there is a problem in that a light source device capable of supplying light in a frame-sequential manner must be used.

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide an external television camera for an endoscope that can improve resolution and use a light source device that supplies white light for naked-eye observation. It is an object.

[Means for solving the problem] An external device for an endoscope that is connected to the eyepiece of an endoscope using an image guide and is equipped with a solid-state image sensor that conveys a subject image from the eyepiece is a television. In the camera, a connecting means is connected to the eyepiece, and optically transmits the subject light flux to the solid-state image sensor, and a spectroscopic means divides the subject light flux into a plurality of pieces in a wavelength region, The spectroscopic means is interposed between the solid-state image sensor and the connection means.

[Operation] With the above-described configuration, the subject light beam from the endoscope is optically transmitted by the connecting means, divided into a plurality of parts in the wavelength range by the spectroscopic means, and then made incident on the solid-state image sensor. There is.

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

1 to 3 relate to the first embodiment of the present invention, in which FIG. 1 is a configuration diagram of an endoscope system, FIG. 2 is an explanatory diagram of a focus adjustment mechanism, and FIG. 3 is an explanatory diagram of a rotating filter. It is.

As shown by reference numeral 1 in FIG. 1, the endoscope system includes an endoscope 112 having an insertion section that can be inserted into a body cavity, a light source device 3 that supplies illumination light to the endoscope 2, and The external endoscope, which will be described later and is detachably connected to the endoscope [2], is composed of a video processor 4 with a television camera installed therein, and an observation monitor 5 that displays video signals from the video processor 4. It has become.

The endoscope 2 includes an elongated insertion section 11 that can be inserted into a body cavity, a large-diameter operation section 12 connected to the proximal base of the insertion section 11, and a large-diameter operation section 12 connected to the proximal base of the insertion section 11. It consists of an eyepiece section 13 connected to the rear end, a universal cord 14 extending from the side of the operating section 12, and a connector 15 provided at the end of the universal cord 14.

The endoscope M2 includes a light guide 16 that guides illumination light from the light source device 3 to the distal end of the insertion section 11, and an image guide 18 that guides the image of the subject from the distal end of the insertion section 11 to the eyepiece section 19. is installed inside. Said family celebration 112
Further, an objective optical system 17 is provided on the distal end surface of the insertion section 11 for forming an image of the subject illuminated by the illumination light on the incident end surface of the image guide 18, and an objective optical system 17 is provided on the eyepiece section. An eyepiece optical system 19 is provided for observing, for example, the image guided to the output end face of the image guide 18 with the naked eye.

The illumination light supplied to the incident end surface of the light guide 16 is guided by the light guide 16 and is directed to the insertion portion 11.
The light is irradiated onto a subject (not shown) from the output end face of the light guide 16, which is disposed at the tip of the light guide 16.

As described above, the image of the subject etc. irradiated with the illumination light is transferred to the image guide 18 by the objective optical system 17.
The image is formed on the @ plane, guided by the image guide 18 to the output end surface of the image guide 18 disposed in the eyepiece section 19, and the eyepiece disposed opposite to the output end surface of the image guide 18. The optical system 19 allows observation with the naked eye, for example.

The light source device 3 includes a lamp drive circuit 71 that drives a lamp 72 such as a xenon lamp, an aperture 75 that controls the amount of illumination light from the lamp 72, a reversible motor 74 that rotates the aperture 75, and a reversible motor 74 that rotates the aperture 75. a dimming circuit 73 that controls the reversible motor 74 using a dimming signal to be described later from the video processor 4; a condensing lens 76 that condenses the illumination light that has passed through the aperture 75 onto the incident end surface of the light guide 16;
A terminal 77 connected to the input end of the dimming circuit 73 and introducing a dimming signal from the video processor 4 is provided.

The dimming circuit 73 has an input end connected to the terminal 77 and an output end connected to the drive end of the reversible motor 74.

One end of the diaphragm 75 is connected to the shaft of the reversible motor 74, and the other end is inserted on the optical axis of the lamp 72 and the condensing lens 76.

The dimming circuit 73 rotates the reversible motor 74 in response to a dimming signal input from the video processor 4 through the terminal 77, and the rotation of the reversible motor 74 causes the aperture 75 to rotate. The amount of illumination light emitted by the lamp 72 is adjusted by the aperture 75. The illumination light, the amount of which has been adjusted as described above, is condensed and irradiated onto the incident end surface of the light guide 16 by the condenser lens 76.

The video processor 4 includes a camera section 23 (described later), which is an external endoscope camera (hereinafter referred to as a TV camera) 21 that is detachably connected to the eyepiece section of the endoscope 2.
, a timing pulse generator 61 that supplies predetermined timing pulses to each block provided in the video processor 4, and a solid layer, which will be described later, provided inside the camera section 23 by the timing pulses of the timing pulse generator 61. A COD drive circuit 62 that drives an image element, a servo circuit 63 that uses timing pulses from the timing pulse generator 61 to drive a motor (to be described later) installed in the camera section 23, and a timing pulse from the timing pulse generator 61. A video signal processor 64 processes the carrier signal from the camera section 23 and converts it into a standard video signal, and a video signal level, which is the brightness of the carrier screen, is detected by the signal from the video signal processor 64. , a video level detection circuit 65 for outputting the dimming signal from the video signal processor 64, a terminal 66 for outputting the standard video signal from the video signal processor 64 to, for example, the observation monitor 5, and a video level detection circuit 65 for outputting the dimming signal from the video level detection circuit 65. A terminal 67 for outputting to the light source device 3 is provided.

The TV camera 21 is composed of a connection section 22 that is detachably connected to the eyepiece section 13 of the endoscope 2, and a camera section 23 that is installed inside the video processor 4.

The connecting portion 22 includes an eyepiece connector 26 that is detachably connected to the eyepiece portion 13 of the family gift 112, and an elongated and flexible universal cord that guides the subject light flux from the eyepiece connector 26 to the camera portion 23. It consists of 27.

The eyepiece connector 26 is disposed opposite to the eyepiece optical system 19 disposed in the eyepiece section 13, and is provided with an image guide (to be described later) disposed inside the universal cord 27. An incident optical system 31 that forms an image, and an image guide 18 inserted between the incident end face of the image guide and the incident optical system 31, for example, installed inside the endoscope 2, superimposes the image on the subject light beam. A phase filter 32 is provided to remove moiré.

The universal cord 27 is provided with an image guide 33 that guides the subject light beam formed on the input end surface to the camera section 23 as described above.

The image guide 33 has an incident end face disposed on the eyepiece connector 26 as described above, and an output end face disposed on the camera section 23 as described later.

The camera section 23 is provided with the image guide 33 and the like, and includes a focus section 28 for adjusting the focus of the object light beam onto a solid-state image sensor, which will be described later, and the image guide 33 that removes moire superimposed on the object light beam. For example, as will be described later, a crystal filter 38 is used to filter the red wavelength Ia region (hereinafter referred to as R), the green wavelength region (hereinafter referred to as R)
RGB filters 42 are arranged as described later, and filters that transmit light in the blue wavelength region (hereinafter referred to as B) are respectively disposed, and the RGB filter 42 is transmitted by a drive signal from the servo circuit 63. motor 4 that rotates the
1, photoelectrically converts the subject light flux imaged on the photoelectric conversion surface,
A solid-state image sensor that outputs an image signal, such as CO
D (charge coupled device) 43.

The image formed on the incident end surface of the image guide 33 by the incident optical system 31 is transferred to the image guide 33 disposed in the camera section 23 by the image noid 33.
The light is guided to the output end face of the light beam and is imaged on the output optical system 35. The image formed on the output optical system 35 is formed on the photoelectric conversion surface of the CCD 43 by the silver image optical system 43.

The timing pulse generator 61 has a first output terminal connected to the input terminal of the CCD drive circuit 62, a second output terminal connected to the input terminal of the servo circuit 63, and a third output terminal connected to the input terminal of the servo circuit 63. It is connected to the synchronization signal input terminal of the video signal processor 64.

The output end of the CCD drive circuit 62 is connected to the drive end of the CCD 43.

An imaging signal output terminal of the CCD 43 is connected to an imaging signal input terminal of the video signal processor 64.

The output end of the servo circuit 63 is connected to the drive end of the motor 41.

The video signal processor 64 has a video signal output end connected to the terminal 66 and a video level signal output end connected to the input end of the video level detection circuit 65.

The input terminal of the observation monitor 5 is connected to the terminal 66.

The output terminal of the video level detection circuit 65 is connected to the terminal 67.
It is connected to the.

A dimming signal line 68 for supplying a dimming signal to the light source device 3 is connected to the terminal 67 .

The timing pulse generator 6'1 generates a predetermined timing pulse and transmits this timing pulse to the CCD.
The signal is output to the drive circuit 62, the servo circuit 63, and the video signal processor 64.

The CCD drive circuit 62 generates a COD drive signal in synchronization with the timing pulse input from the timing pulse generator 61 to its input terminal, outputs it to the drive terminal of the C0D 43, and drives the CCD 43. ing.

The CCD 43 driven as described above converts the light incident on the photoelectric conversion surface into an image signal, which is an electric signal, and outputs it to the image signal input terminal of the video signal processor 64.

The video signal processor 64 extracts a video level signal from the imaging signal input from the CCD 43 to the imaging signal input terminal in synchronization with the timing pulse input from the timing pulse generator 61 to the synchronization signal input terminal, The imaging signal inputted from the CCD 43 to the carrier signal input terminal in synchronization with the timing pulse inputted from the timing pulse generator 61 to the synchronization signal input terminal is outputted to the video level detection circuit 65, and is converted into a standard video signal. The signal is converted into a signal and output to the observation monitor 5 via the terminal 66.

The servo circuit 63 is connected to the timing pulse generator 6
A drive signal for driving the motor 41 is generated in synchronization with a timing pulse input from 1 to the input end, and is output to the drive end of the motor 41.

The motor 41 is rotated by a drive signal input from the servo circuit 63 to the drive end, and thereby the RG
The B filter 42 is adapted to rotate in conjunction.

The focus unit 28 includes an output optical system 35 in which the subject light beam guided by the image guide 33 forms an image;
An output optical system mounting frame 34 connects the output optical system 35 to the image guide 33 and has an inner diameter approximately equal to the outer diameter of the image guide 33, and a photoelectric conversion surface of the CCD 43 converts the subject light flux from the output optical system 35 into the output optical system mounting frame 34. an imaging optical system 37 that focuses an image on the focusing section 28;
an N-image optical system mounting frame 36 that is fixed to the N-image optical system, an inner ring part 51 to which the universal cord 27 of the connecting part 22 is connected, and an outer ring part 5 that can be detachably inserted into the video processor 4.
It is composed of 2.

The TV camera 21 is configured such that the connection section 22 is detachably connected to the video processor 4 through the focus section 28.

As shown in FIGS. 1 and 2, in the focus portion 28, an inner shaft cam groove 53 is formed in the inner shaft portion 51 in the longitudinal direction of the inner shaft portion 51, and an outer shaft cam groove 53 is formed in the outer shaft portion 52. A groove 54 is formed at a predetermined angle with the longitudinal direction of the outer shaft portion 52, and a screw 55 is formed in the inner shaft cam groove 53 and the outer shaft cam groove 54.
is inserted, and this screw 55 is inserted into the image carrier optical system mounting frame 36.
It is designed to be screwed onto the

By rotating the outer shaft portion 52, the imaging optical system mounting frame 36 is moved in the longitudinal direction, and the focus of the subject light beam that is imaged onto the photoelectric conversion surface of the CCD 43 by the image carrying optical system 37 can be varied. It looks like this.

As shown in FIGS. 1 and 3, the RGB filter 42 is formed into a substantially disk shape, and this disk includes an R filter 44 that transmits R light, a G filter 45 that transmits G light, and a B filter 44 that transmits R light. B filters 46 that transmit light are arranged, for example, at angular intervals of 120 degrees. Further, the RGB filter 42 is connected to the shaft of the motor 41, and the motor 41 connects the R filter 44 of the RGB filter 42, the
One of the filter 45 and the B filter 46 is arranged at a position to be inserted.

The RGB filter 42 is connected to the motor 41 as described above.
The R filter 44 is rotated by the R filter 44.
, one of the G filter 45 and the B filter 46 is, for example, 1
It is inserted between the imaging optical system 37 and the CCD 43 at intervals of /60 seconds (1 field).

As described above, the CCD 43 photoelectrically converts the subject luminous flux that has been captured in the R, G, and B order in time series by the RGB filter 42, that is, the R, G, and B imaging signals are The image signal is output to the image signal input terminal of the video signal processor 64.

As described above, the video signal processor 64 synchronizes the R, G, and B imaging signals input in time series to the Ao-image signal input terminal using, for example, a frame memory.
, G, and B have the same carrier signal level, they are converted to a standard video signal so that the image becomes white.

The operation of the endoscope system configured as described above will be explained.

The lamp 72 of the light source device 3 is driven by a lamp drive circuit 71 to generate illumination light. This illumination light is applied to a dimming circuit 73 and driven by a reversible motor 74 which is rotated as described later.
The amount of light is adjusted by a diaphragm 75 connected to.

The dimming circuit 73 rotates the reversible motor 74 in response to a dimming signal input from the video processor 4 through a terminal 77, and the rotation of the reversible motor 74 causes the aperture 75 to rotate. , this aperture 75 causes the lamp 7 to
2, the amount of illumination light is adjusted. The illumination light whose light intensity has been adjusted as described above is condensed and irradiated onto the incident end surface of the light guide 16 by the condenser lens 76.

As described above, the illumination light supplied to the incident end face of the light guide 16 is guided by the light guide 16,
Inside? J! Light is irradiated onto a subject (not shown) from the output end face of the light guide 16 disposed at the tip of m2, that is, the tip of the insertion section 11.

As described above, the image of the subject etc. irradiated with the illumination light is formed by the objective optical system 17 disposed at the distal end of the insertion section 11 on the incident end surface of the image guide 18 disposed inside the inner cover 12.

The image guide 18 guides the image formed on the input end surface to the output end surface of the image guide 18 disposed in an eyepiece 19 provided at the proximal base of the endoscope 2 .

As described above, the image guided to the output end face of the image guide 18 is observed, for example, with the naked eye, by the eyepiece optical system 19 disposed opposite to the output end face of the image guide 18.

Furthermore, by connecting the eyepiece connector 26 to the eyepiece section 13, the image guided to the output end surface of the image guide 18 is disposed opposite to the output end surface of the image guide 18 as described above. An image is formed on the entrance end surface of the image guide 33 by the eyepiece optical system 19 and the entrance optical system 31. At this time, the phase filter 32 inserted between the incident optical system 31 and the image guide 33 removes the moire superimposed on the subject light beam by the image guide 18.

As described above, the image formed on the entrance end surface of the image guide 33 by the three entrance optical systems is guided by the image guide 33 to the exit end surface of the image guide 33 disposed in the camera section 23, An image is formed on the output optical system 35. The image formed on the exit optical system 35 is formed on the photoelectric conversion surface of the CCD 43 by the imaging optical system 37. At this time, the moire superimposed on the subject light flux by the image guide 33 is removed by the crystal filter 38 inserted between the imaging optical system 37 and the CCD 43. Further, moiré that cannot be removed even by the crystal filter 38 is removed from the outer shaft portion 52 of the camera section 23.
By rotating the imaging optical system 37, the image carrier optical system mounting frame 36 that fixes the imaging optical system 37 moves in the longitudinal direction. By intentionally shifting the focus, I try to make it inconspicuous to the extent that it does not interfere with the observation of the subject.

An RG8 filter 42 is inserted in the optical path between the imaging optical system 37 and the crystal filter 38.

Incidentally, the timing pulse generator 61 of the video processor 4 generates a predetermined timing pulse, and outputs this timing pulse to the COD drive circuit 62, servo circuit 63, and video signal processor 64.

The COD drive circuit 62 generates a COD drive signal in synchronization with the timing pulse input from the timing pulse generator 61 to its input terminal, outputs it to the drive terminal of the CCD 43, and drives the CCD 43.

The CCD 43 driven as described above converts the light incident on the photoelectric conversion surface into a carrier signal, which is an electrical signal, and outputs it to the carrier image signal input terminal of the video signal processor 64.

The video signal processor 64 extracts a video level signal from the carrier signal input from the CCD 43 to the picture signal input terminal in synchronization with the timing pulse input from the timing pulse generator 61 to the synchronization signal input terminal. At the same time as being output to the video level detection circuit 65, a carrier signal is input from the CCD 43 to the carrier signal input terminal in synchronization with the timing pulse input from the timing pulse generator 61 to the synchronization signal input terminal. The signal is converted into a standard video signal and output to the observation monitor 5 via the terminal 66.

The servo circuit 63 is connected to the timing pulse generator 6
A drive signal for driving the motor 41 is generated in synchronization with a timing pulse input from 1 to the input end, and is output to the drive end of the motor 41.

The motor 41 is rotated by a drive signal input from the servo circuit 63 to the drive end, and thereby the RG
The B filter 42 is rotated in conjunction.

The RGB filter 42 is connected to the motor 41 as described above.
The R filter 44 is rotated by the R filter 44.
, one of the G filter 45 and the B filter 46 is, for example, 1
It is inserted between the imaging optical system 37 and the CCD 43 at intervals of /60 seconds (1 field).

Therefore, the CCD 43 has the R
The GB filter 42 photoelectrically converts the subject luminous flux incident in time series, for example, in the order of R, G, and B, that is, R, G
, 8 in time series to the video signal processor 64.
output to the i-image signal input terminal of.

The video signal processor 64 inputs R and G signals from the CCD 43 to the imaging signal input terminal as described above.

For example, the carrier signals inputted in time series of B are synchronized by a frame memory, for example, R, G.

If the B imaging signals have the same imaging signal level, they are converted to a standard video signal so that the image becomes white.

Further, the video signal processor 64 extracts a video level signal from the imaging signal input from the CCD 43 to the imaging signal input terminal in synchronization with the timing pulse input from the timing pulse generator 61 to the synchronization signal input terminal. and outputs it to the video level detection circuit 65.

The video level detection circuit 65 rectifies, for example, the video level signal mentioned above, and outputs it as a dimming signal to the light source device 3 via a signal line 68 connected to a terminal 67. The signal line 68 is connected to the terminal 77 of the light source device 3, and as described above, the dimming signal via this signal line 68 is input to the dimming circuit 73, and the light source by the lamp 72 is controlled. Adjust the light intensity. In other words, the amount of light from the light source provided by the lamp 72 is adjusted to an appropriate amount based on feedback from the video processor 4.

That is, the TV camera 22 of this embodiment has the eyepiece connector 2
By separating the connection part 22 provided with 6 and the camera part 23, the connection part to be connected to the endoscope 2 can be made smaller, and the resolution can be improved by using the frame-sequential image transport method using the RGB filter 42. This has the effect that good insulation properties can be obtained by optically connecting the endoscope 2 to the endoscope 2.

FIG. 4 is a configuration diagram of main parts of an endoscope system according to a second embodiment of the present invention. Note that the same reference numerals are used for the same components as those in the above-described embodiment, and the description thereof will be omitted.

The endoscope system in this embodiment includes an endoscope 2 and a TV.
It is composed of a camera 21, a video processor 7, an observation monitor 5, and a light source device (not shown). This light source device is similar to the optical 8I device described in the first embodiment.

The endoscope 2 guides the image of the subject from the distal end to the eyepiece 13 by the image guide 18, as in the first embodiment.
The object is observed using an eyepiece optical system 19.

The video processor 7 is the same as the video processor described in the first embodiment except for the servo circuit and the camera section of the TV camera, and is designed so that a connector (to be described later) of the TV camera 21 can be detachably connected to the video processor 7. It has become.

The TV camera 21 includes a connecting section 22 connected to the eyepiece section 13 of the endoscope 2, and a camera section 23.

The connecting portion 22 includes: 1) an eyepiece connector 26 that is detachably connected to the eyepiece portion 13 of the endoscope 2; and an elongated connector 26 that guides the subject light flux from the eyepiece connector 26 to the camera portion 23; A flexible universal cord 27 is connected 41i.

A focus section 28 provided at the end of the universal cord 27 is detachably inserted into the camera section 23, and a motor 41, an RGB filter 42, a servo circuit 63, a crystal filter 38, and a CCD 43 are also provided. Connection cable 24 connected to the video processor 7
For example, it extends from the rear.

A connector 25 is provided at the end of the connection cable 24, and the connector 25 has a timing pulse terminal 71.
, an imaging signal terminal 72 and a CCD drive terminal 73 are provided.

The connector 25 is detachably connected to the video processor 7.

The timing pulse generator 61 has a first output terminal C
It is connected to the input end of the CD drive circuit 62, its second output end is connected to the input end of the servo circuit 63 via the timing pulse terminal 71, and its third output end is connected to the input end of the video signal processor 164. Connected to the signal input end.

The output end of the COD drive circuit 62 is connected to the drive end of the CCD 43 via the CCD drive terminal 73.

The imaging signal output terminal of the CCD 43 is connected to the imaging signal terminal 7.
2 to the ll image signal input terminal of the video signal processor 64.

The output terminal of the video level detection circuit 65 is connected to the terminal 67.
It is connected to the.

A dimming signal line for supplying a dimming signal to a light source device (not shown) is connected to the terminal 67.

Note that the second output terminal of the timing pulse generator 61 may also be configured to output to another terminal so that a light source device that generates field sequential light can be connected thereto.

Further, the COD drive circuit 62 may be provided in the camera section 23. In this case, the timing pulses supplied from the timing pulse generator 61 to the COD drive circuit 62 and the servo circuit 63 of the camera section 23 should be the same. In this case, the signal line provided inside the connection cable 24 may be used in common.

That is, by making the connection means 22 of the TV camera 21 as short as possible, it is possible to suppress the attenuation of the subject light flux due to the image guide, and it is possible to observe a bright subject. There is an effect that an electronic endoscope can be constructed by connecting a light source device that generates field sequential light using a timing pulse outputted to the pulse terminal 71 and a field sequential type electronic endoscope.

Other configurations, operations, and effects are the same as those of the embodiments described above.

Note that instead of the RGB filter, a rotating filter that separates light in other wavelength ranges may be used to separate the subject light flux based on, for example, color difference.

Alternatively, a beam splitter may be provided in the requisitioned connector, and the beam may be observed with the naked eye through the eyepiece connector, and a concave image may be captured using a TV camera and recorded on, for example, a VRT device.

Furthermore, the amount of illumination light may be adjusted by the light source device using the observation screen without using the dimming signal line.

[Effects of the Invention] As explained above, according to the present invention, resolution is improved by using the frame sequential imaging method, and by providing a connection part, the connection point with the endoscope is miniaturized, and operability is improved. death,
It is safe because it is not electrically connected to the endoscope and is completely insulated from the subject, and it is also economical because it can use the light source device that supplies white light that is used for naked eye observation. There is an effect.

[Brief explanation of drawings]

1 to 3 relate to the first embodiment of the present invention, in which FIG. 1 is a configuration diagram of an endoscope system, FIG. 2 is an explanatory diagram of a focus adjustment mechanism, and FIG. 3 is an explanatory diagram of a rotating filter. , FIG. 4 is a configuration diagram of main parts of an endoscope system according to a second embodiment of the present invention. 21...TV camera 22...Connection part 23...Camera part

Claims (1)

[Scope of Claims] An external television camera for an endoscope, which is connected to an eyepiece of an endoscope using an image guide and is equipped with a solid-state image sensor that captures a subject image from the eyepiece. a connecting means that is connected to the eye and optically transmits the subject light beam and makes it enter the solid-state image sensor; and a spectroscopic means that divides the subject light beam into a plurality of pieces in a wavelength region, and the solid-state image sensor and An external television camera for an endoscope, characterized in that the spectroscopic means is inserted between the connecting means and the connecting means.