JPH01317424A - Electronic endoscope device - Google Patents

Abstract

PURPOSE:To easily observe a picture even while a color separating filter is attached and detached and to cause operability to be satisfactory and to improve safety by causing a monitor picture to be a still picture. CONSTITUTION:When the position of a tip part is confirmed while an inserting part 7 of an endoscope 2 is inserted into a body cavity, an external light observing switch 47, which is provided in a light source device 3, is turned on. A filter moving motor 31 starts driving and a revolving color filter 24 starts saving from an optical path. During such a moving period T1, an illuminating light is not determined and when the moving of the revolving color filter 24 is completed, the illuminating light goes to be a white light whose light quantity is increased. Then, the position of the tip part can be easily confirmed by the transmitted light from the inside of the body. A control circuit 46 causes respective frame memories 43R, 43G and 43B to be write prohibiting condition by the falling of a turning-on signal from the external light observing switch 47 and the picture of a monitor 6 is caused to be the still picture. Then, a color picture, which is just before the revolving color filter 24 is moved, is displayed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for making a displayed image a still image during a period in which a color separation filter capable of transmitting illumination light compatible with a frame sequential method is inserted or removed from an optical path. An electronic endoscope device capable of

[Problems that conventional technology and inventions are trying to solve] In recent years,
By inserting the tD length insertion section into the body cavity, it is possible to observe internal organs, etc. in the body cavity, and perform various medical treatments as necessary using the treatment instrument inserted into the treatment instrument channel. I (also called scope or fiber scope)
is widely used.

Also, solid state devices such as charge-coupled devices (CODs)! Various electronic scopes using lit image elements as imaging means have also been proposed.

For example, as shown in patent No. 161-82731, the ms method of color images of this electronic scope is as follows.
There is a field-sequential method in which the illumination light is sequentially switched to R (red), G (green), B (blue), etc.; Color mosaic type (color mosaic type) equipped with a filter array in which 16 color transmission filters are arranged in a mosaic shape etc. to transmit color light such as , B, etc.
Also called simultaneous type. ).

By the way, in a field-sequential electronic scope, the illumination light that illuminates the subject is R (red) and G (green).

Since the light is transmitted through a color separation filter such as B (portrait) and separated into each color, the illumination is less sufficient than the light beam method that illuminates the subject with white light, but the position of the tip of the electronic scope can be determined by the light transmitted outside the body. When checking, it may be difficult to check because the amount of illumination light is small. To solve this problem, for example, Japanese Patent Laid-Open No. 62-2927N discloses a technique for increasing the amount of light by removing the color separation filter from the optical path even when using a field-sequential electronic scope. However, in this case, during the period in which the color separation filter is moved from inside the optical path to outside the optical path, and conversely from outside the optical path to inside the optical path, the resulting image becomes a very unsightly colored image that is neither the original color image nor a black and white image. Put it away. Furthermore, if an attempt was made to increase the transmitted light m by a flash, the illumination light would be greater than that originally required by the imaging system, and there was a risk that the monitor image would become pure white.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and provides an electronic endoscope device that is easy to view images during the period when color separation filters are inserted and removed, and has good operability. The purpose is to provide

[Means for Solving the Problems] The electronic endoscope device according to the present invention has color separation means capable of separating white light of Ω·1 outputted from a light source into each color light in a field-sequential manner;
a moving means that allows the color separation means to be inserted into and removed from the optical path of the light source; and a movement means that visualizes a subject illuminated by the illumination light separated into each color light by the color separation means and converts the subject image into an electrical signal. Monkey image means and said ll! 1 by image means! ? Video of the electrical signal ff13!1! a signal processing means for inputting the output signal of the signal processing means, and a display means capable of displaying the subject image described in 6u on a screen;
1' While the moving means 9 is in operation, the subject image displayed by the i display means is moved to a desired I! The apparatus is equipped with an image stilling means that can produce a still image during 11.

[Operation] In the present invention, the moving means inserts and removes the color separating means from the optical path when the distal end of the scope is confirmed.

The image on the image display means is displayed when the color separation means is inserted or removed.
The image freeze means makes the image a still image for a desired period.

[Example 1 Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 5 show a first embodiment of the invention.

In FIG. 3, the electronic endoscope device 1 includes an inner mirror 2, a light source device 3 that supplies illumination light to the endoscope 2, and an endoscope 2.
a control device 4 that processes the output signal of the control device 4; and a monitor 6 that displays the video signal 9 output from the control device 4 on a screen.
It is composed of.

The internal view lt2 includes an elongated insertion section 7, a large-diameter operating section 8 connected to the rear end side of the insertion section 7, and a light guide and a signal extending from the side of the operating section 8. cable 9
It is equipped with

A hard tip 11 is provided on the distal end side of the insertion section 7, and a step 1 of a bendable bending section 12 is provided on the rear side adjacent to the tip 11. Further, a flexible soft part 13 is connected to the rear of the curved part 12. The bending section 12 can be bent in the vertical/horizontal direction by operating a bending operation knob 14 provided on the operation section 8.

A light guide and signal connector 16 is provided at the rear 9 of the light guide J3 and the signal cable 9, and is connected to the light source V4 position 3 and the control device 4 at the same time. This light source device 3 and control device 4
is a signal cable 18 with connectors 17 on both ends.
connected by. Furthermore, the control device 4 is connected to the monitor 6 by a signal cable 19.

The light source device? The illumination light supplied from 13 is the tip part 11
J: The illumination light is emitted to the front, and a part of this illumination light hits the inner wall of the body cavity 2.
0 is transparent.

In FIG. 1, a light source section 21 provided in the light source device 3 includes a light source lamp 22 and color transmission filters 23R, 23G, and 23B for three primary colors of R (red), G (green), and B (blue). A rotating color filter 24 is provided. This rotating color filter 24 is rotationally driven by a motor 26. The illumination light emitted from the light source lamp 22 is converted into parallel light by a parallel lens 27 and is made to enter the rotating color filter 24 .

The illumination light transmitted through the rotating color filter 24 is converted into colored lights of red, green, and blue wavelengths, and is condensed by a condensing lens 28 to be incident on the incident end surface of the light guide 29.

The rotating color filter 24 is moved by a filter moving motor 31.
Therefore, llTi is removed from the optical path connecting the light source lamp 22 and the incident end face of the light guide 29.

The light guide 29 is inserted through the endoscope 2, and can irradiate illumination light onto the inner wall 20 of the body cavity by means of a light distribution lens 32 disposed in front of the output end face of the light guide 29.

The reflected light corresponding to the red, green, and blue colored lights from the body cavity inner wall 20 is transmitted through an objective lens 33 provided at the distal end portion 11, and is transmitted to a solid body provided at the imaging position of this objective lens 33. The light is received by the imaging surface of a 111m element (hereinafter abbreviated as COD) 34. This CCD 3/1 photoelectrically converts the subject image, and the CO
By the driving clock applied from the D driver 36,
For example, the images are output sequentially in the horizontal direction. This electrical signal containing image information is input to a preamplifier 37 in the control device 4.

The electric signal amplified by this preamplifier 37
The video signal is extracted by the sample hold circuit 38, and further,
After being subjected to γ correction by the γ correction circuit 39, it is converted into a digital signal by the A/D converter 41. This electrical signal is synchronized with the color plane sequential illumination light by the multi-break 42.
1 is returned and sequentially written into the R frame memory 43R, G frame memory 43G, and B frame memory 438 corresponding to each color of red, green, and blue. Each frame memory 43
R, 43G, and 43B are read out simultaneously in the horizontal direction at a speed matched to the monitor 6, and each D/A conversion: self 4
4, it is converted into an analog signal and becomes three primary color signals of R, G, and B. These three primary color signals are input to the monitor 6 so that the observed region is displayed in color.

A control circuit 46 is provided in the tlI control device 4 to control the timing of the entire signal processing circuit. This control circuit 46 is driven by the COD driver 36 converting the voltage level and applying it to the CCD 34.
In addition, a zumbling pulse is input to a zumbling hold circuit 38 that extracts a video signal from an electrical signal read out using this drive clock. .

Further, this control circuit 46 controls the conversion speed of the A/D converter 41 and each frame memory 43 of the multi-break memory 42.
It controls loading and reading of data into R, 43G, and 43B and the conversion speed of the D/A converter 44.

] 1θ The control circuit 46 receives ON and OFF signals from an extracorporeal light observation switch 47 provided in the light source device 3 together with the filter moving motor 31, and the control circuit 46 receives ON and OFF signals manually. Each frame memory/13R, 43G, 43B
is prohibited from entering or exiting, and the image on the monitor 6 is a still image. Further, the filter moving motor 31 is adapted to retreat the rotating color filter 24 from the optical path connecting the light source lamp 22 and the incident end surface of the light guide 29 in response to an ON signal. Furthermore, when the extracorporeal light observation switch 47 is turned on again, the filter moving motor 31 inserts the rotating color filter 24 onto the optical path, and the control circuit 46 releases the write-inhibited state of each frame memory 43R, 43G, and 43B. It has become. When the write-inhibited state of each frame memory 43R, 43G, and 43B is released, the screen of the monitor 6 becomes a color moving image.

The operation of the electronic endoscope device 1 configured as described above will be described in a second manner.
This will be explained using the timing chart shown in the figure.

The operator inserts the insertion portion 7 of the endoscope tfi2 into the body cavity.

Output of light source ti position 3! )1V illumination light is sequentially separated into R (red), G (green), and B (blue) color lights as shown in FIG. 2(a), and is supplied to two light guides.

When confirming the position of the distal end portion 11 during the insertion operation, the operator turns on the extracorporeal light observation switch 47 provided in the light source device 3. When the ON signal falls, the filter moving motor 31 starts to be driven, and the rotating color filter 24 starts to retreat from the optical path as shown in FIG. 2(C).

During this movement period T1, the illumination light is uncertain, and when the movement of the rotating color filter 24 is completed, the illumination light becomes 1.
11, and the position of the distal end 11 can be easily confirmed by the transmitted light from inside the body. Further, at the fall of the ON signal of the external light vA detection switch 47, the control circuit 46 sets each frame memory 43R, 43G, and 43B in a prohibited state and sets the image on the monitor 6 as a still image.
The color image immediately before the rotating color filter 24 moves is displayed.

Next, when the operator finishes confirming the tip position using the transmitted extracorporeal light, he turns the extracorporeal light observation switch 47 to A again. At the fall of this ON signal, the rotating color filter 24, which had been retracted out of the optical path, begins to move onto the optical path. Moving period T
After 3, the movement ends and the illumination light is color separated from the white light R (red).

When the color changes to G (green) and B (blue), the control circuit 4.6 releases the following inhibited state of each frame memory 43R, 43G, and 43B. New image data of the observation area illuminated with R (red), G (green), and 8 (blue) color lights are sequentially written to each frame memory 43R, 43G, and 43B, read out simultaneously, and displayed on the monitor. Color video is displayed on the 6 screen.

In this embodiment, the image is made into a color still image during the period T4, which is the sum of the period TI, T3 during which the rotating color filter 24 moves and the period T2 during which it is fixed outside the optical path. An unsightly image is not displayed during the position confirmation work of the tip portion 11.

Incidentally, the frame memory may be configured as shown in FIG.

In the same figure, a memory section 54 consisting of two frame memory sections 52 and 53 is connected to the rear stage of the multiplexer 42. This one frame memory 52 has R, G
, R1 frame memory 52R, Gl into which color signals of B are written.
A frame memory 52G and an 81 frame memory 52B are provided, and the other frame memory 53 is provided with an R2 frame memory 53R, a G2 frame memory 53G, and an 82 frame memory 53B.

A switch 56 is provided downstream of this memory section 54, and the color signals read from each frame memory 52, 53 are input to six input terminals provided on this switch 56. . This switch 56 selects the frame memory 52 or 53 and simultaneously outputs the color signals from the selected frame memory 52 or 53 to the D/A conversion VS44.44.44. The circuit configuration after the D/A converters 44, 44, 44 is the same as that shown in FIG.

The control circuit 46 outputs a frame switching signal to the multiplexer 42.

This frame switching signal is inverted and output to switch 56 and synchronization circuit 57. The multiplexer 42 selects the frame memory 52 or 53 from which the RGB color equal code is to be input or output based on the frame switching signal, and the miswitch 56 does not read the RGB color signal from the frame memory 52 or 53 that is not selected by the multiplexer 42 based on the frame switching signal. : Sea urchins are turning. Further, the control circuit 46 outputs a write signal to the frame memory 52, 53 selected (written) as J: to the multi-frame memory 42, and outputs a write signal to the frame memory 52, 53 that is not selected (read size) as I.1.
．． The read signal q is output to 53.

The control circuit 46 and the synchronization circuit 57 each receive a signal from the extracorporeal light observation switch 47, and the synchronization circuit 57 switches the frame memory when the signal from the extracorporeal light observation switch 47 is input. Immediately after the signal is input, a monochrome/color display switching signal is output to the two output selector switches 48 and 49.

The operation of FIG. 4 will be explained using FIG. 5.

In the memory section 54, two frame memories 52 and 53 are alternately read out. That is, a frame memory switching signal as shown in FIG. 5(d) is output from the control circuit 46 to the multiplexer 42.

For example, at the rising edge of the frame switching signal, the multiplexer 42 selects the frame memory 52 and writes the RGB color signals to the memories 52R, 52G, and 52B, and at the falling edge, the multiplexer 42 selects the frame memory 53 and writes the RGB color signals to the memory 53.
Exit to R, 53G, 53B. Further, the switch 56 selects the frame memory 52 at the rising edge of the inverted frame memory switching signal and transfers the RG8 color signals to each memory 52R.
, 52G, and 52B at the same time, select the frame memory 53 at the falling edge, and read the RGB color signals from each memory 5.
Read simultaneously from 3R, 53G, and 53B. In this way, the multiplexer 42 and the switch 56 repeatedly select different frame memories 52, 53, and the read RGB color signals are transferred to the D/A converter/14, 44.
44 and a two-manpower/one-output changeover switch 48 and 49, the signal is output to the monitor 6.

This occurs when the extracorporeal light observation switch 47 is turned on to confirm the position of the distal end 11 of the insertion section 7.

Turn on the filter moving motor 31 (as shown in Figure 1).

) is input to the control circuit 46 and the synchronization circuit 57. The filter moving mode 931 moves in response to this ON signal, and the illumination light becomes white. Immediately after the ON signal is input, the synchronization circuit 57 outputs a monochrome/color display switching signal (not shown in FIG. Output to output selector switches 48 and 49. This black and white/color display switching signal causes the switch 48 to switch to the input terminal 48b.
The switch 49 selects the input terminal 49b, and outputs the color signal of the G2 frame memory 53G to the monitor 6 in the state shown in FIG. It is input on monitor 6 (ffi number is G
Since only the signal is used, the normal observation image and the vJ image of the black and white ii image of 5A, G11 color, are displayed stably, and no color shift occurs.

After confirming the position of the tip 11, the on signal is input again from the extracorporeal light observation switch 47. This ON signal causes the filter moving motor to move the rotary filter 24 into the optical path. As a result, the illumination light becomes R, G, and eight-color light in sequence.

The synchronization circuit 57 turns off the black-and-white/color display switching signal that has been output in synchronization with the falling edge or falling edge of the frame memory switching signal immediately after the ON signal is input. By turning this off, the two-man power one output selector switch 48.49 selects the input terminal 488.49a and outputs the RG signal from the frame memory 52 or frame memory 53.
The B color signal is output to the monitor 6. On the monitor 6, a color video endoscopic image, which is a normal observation image, is displayed.

FIGS. 6 and 7 show modifications of the first embodiment.

This modification corresponds to FIGS. 4 and 5, and whereas in FIG. 4 the memory section 54 is composed of two groups of frame memories 52 and 53, the memory section 54 is composed of one group of frame memories. , constitutes a moly crystal 54.

Note that the configuration from the memory section 54 to the preceding stages is the same as in the first embodiment.

The memory section 54 of this modification includes four frame memories 54a.
, 54b, 54c, and 54dr. A multiplexer 42 is not provided.

Reading and writing to the memory section 54 is performed by a read signal and a write signal from the control circuit 46. The color signal read out by the write signal is converted to D/8 Pl! 44, 44, and 44 simultaneously and reach the monitor 6 via changeover switches 48 and 49.

The changeover switches 48 and 49 are connected to the synchronization circuit 5 as in FIG.
The switching is controlled by the black and white/color display switching signal outputted by the synchronization circuit 57, but the synchronization circuit 57 is controlled by the control circuit 46.
A monochrome/color display switching signal is output in response to a 1-frame memory write end signal input from the 1-frame memory write end signal.

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

The operation of FIG. 6 will be explained using FIG. 7.

The A/D converter 41 sequentially sends digitally converted RGB color signals. For example, when the color signal R1 is sent, the control circuit 46 controls the frame memory 54a.
Outputs the light signal to the frame memory 5 and sends the color signal @R1 to the frame memory 5.
Concentrate on 4a. At the same time, the control circuit 46 outputs a read signal to the other frame memories 54b, 54c, and 54d, and
The color signals RO, GO, and BO are read from d. Note that the circle mark in FIG. 7(b) indicates that the frame memory 54 is in a read state.

Next, when the color signal G1 is sent from the A/D converter 41, the control circuit 46 outputs a write signal to the frame memory 54b, and transfers the color signal G1 to the frame memory 5°4.
Write to b. At the same time, the control circuit 46 controls another frame memory 54a.

A read signal is output to 54c and 54d, and color signals R1 and GO are output from the frame memories 54a, 54c and 54d.
, 80.

Next △/D Hen I! J! When the color signal B1 is sent from the device 41, the control circuit 46 outputs the frame memory 54c.
Outputs the light signal to the frame memory 5 and sends the color signal @31 to the frame memory 5.
Write to 4G. At the same time, the control circuit 46 controls another frame memory 54a.

Read signals are output to 54b and 54d, and color signals are output from the frame memories 54a, 54b and 54d.

Read R1, G1.80.

This J: There are four frame memories 54a, 54b,
One of the frame memories 54c and 54d is always in a writing state, and the other three frame memories are in a reading state.

The control circuit 46 outputs a write signal and a read signal to the memory section 54 as described above, and also outputs, for example, a color signal R1 to the frame memory 54a (as shown in FIG.
A one-frame memory loading/unloading end signal is output to the synchronization circuit 5 as shown in C).

When the ON signal from the extracorporeal light observation switch 47 is input as shown in FIG. The monochrome/color display switching signal is turned on as shown in FIG. 2(e).

This monochrome/color display switching signal is input to switches 48 and 49, and switching is performed as described in the first embodiment. As a result, the monitor 6 displays a monochromatic black-and-white moving image that is different from the normal observation image.

When the confirmation of the tip 11 is completed and the external light observation switch 47 turns on again, the synchronization circuit 57 synchronizes with the rise of the one-frame input/exit end signal immediately after this on signal. The monochrome/color display switching signal, which is in the on state, is turned off. The switches 48 and 49 are switched by this off signal, and a color moving image of the normally observed image is displayed on the monitor 6.

be done.

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

FIGS. 8 and 9 show other modifications of the first embodiment.

In this modification, FIG. 6 shows four frame memories 54a, 54.
b, 54c, and 54d, and three frame memories.

The video signal γ-corrected by the γ-correction circuit 39 is branched, one of which is input to the A/D converter 41, and the other is connected to the changeover switches 121, 122, and 123. The A/DI converter 41 digitizes the video signal and configures the memory section 58 as an R frame memo.

58a, G frame memory 58b, B frame 58c
It is designed to be written in each. Each frame memory 58
The outputs of a, 58b, and 58c are each connected to a D/A converter 44.4.
4. After being converted to analog in 44, the changeover switch 12
1,122.123 is input. This changeover switch 1
21,122゜123(each '?2゜(7) input Oiu
Children 121 a, 12 l b.

122a, 122b, 123a, 123b and one output terminal 121c, 122c, 123c, the video signal from the γ correction circuit 39 is input to the input terminals 121a, 122a, 123a,
, 123c are configured to receive color signals from D/A converters 44, 44, and 44. This changeover switch 1
21, 122, and 123 are individually controlled to be switched by a control signal from a control circuit 46.

Output terminals 121c, 12 of changeover switch 121.123
3c is the input terminal 48a, 4 of the changeover switch 48.49
9a, output terminal 12 of selector switch 1゜22
2C is the input terminal 48b, 49 of the changeover switch 48.49
b and monitor 6.

The other constructions are the same as in Figure 6, which is a modification of the field 1 practical example.

The operation of this modification will be explained using FIG. 9.

The γ-corrected video signal from the γ correction circuit 39 is sent to the selector switch 1 as an RGB sequential signal as shown in FIG. 9(b).
21, 122, 123 and the A/D converter 41. Here, for example, when the color value @R1 is output from the γ correction circuit 39, this color signal R1 is transferred to the A/D converter 41 and the changeover switches 121, 122, 123 (7) input terminals 121a, 1
22b, 123a, etc. The A/D converter 41 digitizes the color signal R1 and stores this signal in the memory section 58.
Output to. A write signal is input to the R frame memory 58a from the control circuit 46 to the memory section 58, and the write signal is input to the R frame memory 58a.
3. The color signal R1 is written into the R frame memory 58a by this write signal.

The control circuit 46 outputs a read signal to the G frame memory 58b and the B frame memory 58c at the same time as outputting the write signal, and reads out the color signals GO and BO from the G frame memory 58b and the B frame memory 58c.

Incidentally, the O marks in (b), (C), (d), and (e) of the same figure indicate that the frame memory 58 is in a read state.

The read color signal Go, 80 is sent to the 6/A converter 44.
After converting to analog at 44, selector switch 122.12
It is input to the input JO'A of No. 3 122c and 123c.

On the other hand, the color value Y)R1 that is being read and written to the R frame memory 58a is simultaneously set by the changeover switches 121 and 122.
123 input terminals 121a, 122a, and 123a. This changeover switch 121, 122, 123
A control circuit 4G inputs a control signal q to control switching a and II.

The control circuit 46 includes changeover switches 121 and 122 connected to the frame memory to which the light output is output.
．． 123 receives the signal from the γ correction circuit 39, and the changeover switches 121, 122, and 123 connected to the frame memory to which the read signal is output are 1/l, z-mu memo! J58a, 5 (receives signals from 3b, 58C) and outputs a control signal. In other words, in the state shown in FIG. 8, since u1 has been stored in the R frame memory 58a, this The changeover switch 121 connected to the R frame memory 58a is switched to the input terminal 121a side, and the changeover switch 122.1 connected to the G frame memory 58b and B frame memory 58C, which are being read, is switched to the input terminal 121a side.
23 is switched to the input terminal 122b, 123b side.

The color signal R1, which is the color signal written in this way, the G frame memory 58b and the B frame memory 58
The color signal GO2BO read from c is output to the monitor 6.

Next, the γ correction circuit 39 outputs the color signal G1. This color signal G1 is outputted to the memory section 5 through the A/D converter 41. This memory section 58 includes a control circuit 46.
A write signal is output from the G frame memory 58b to the G frame memory 58b, and the color signal G1 is written into the G frame memory 58b.

Further, a read signal is input from the control circuit 46 to the other frame memories 58a and 58c, and the color signals R1 and 80 are read out.

A control signal from the control circuit 46 causes the selector switch 122 to be switched to the input terminal 122a side, and the square selector switches 121 and 123 to be switched to the input terminals 121b and 123b side.

The color signal G1, which is the color signal that has been incorporated in this way, the R frame memory 58a, and the 8 frame memory J
The color signal R1°Bo read from 8c is output to the monitor 6.

This process is then repeated one after another, and the color signal is output to the monitor 6. [The monitor 6 displays a color moving image which is a normal image.

Similarly to FIG. 6, which is a modification of the first embodiment, the control circuit 46 outputs a one-frame memory write end signal as shown in FIG. 9(f) when the color signal has been stored in the frame memory. It is output to the synchronization circuit 57.

When the extracorporeal light observation switch 47 is set to A in order to confirm the position of the tip 1, the off signal, not shown in FIG. 9(g), is input to the synchronization circuit 57.

The synchronization circuit 57 outputs a black-and-white/color display switching signal as shown in FIG. 4(h) in synchronization with the rising edge of the one-frame memory write end signal immediately after this ON signal. This monochrome/color display switching signal is input to switches 48 and 49, and switching is performed as described in the first embodiment. As a result, the monitor 6 displays a monochromatic black-and-white moving image that is different from the normal observation image.

When the confirmation of the tip 11 is completed and the on signal is input again from the extracorporeal light observation switch 47, the synchronization circuit 57 is turned on in synchronization with the rise of the one frame memory loading/unloading end signal immediately after this on signal. Turn off a certain monochrome/color display switching signal.

The switches 48 and 49 are switched by this off signal, and the monitor 6 again displays a color moving image, which is a normally observed image. Other configurations and effects are similar to those of the first embodiment.

10 and 11 show a second embodiment of the invention.

In this embodiment, the image is kept as a still image for a period slightly longer than the period during which the rotating color filter 24 moves.

In this embodiment, a structure and operation different from those of the first embodiment will be described.

The extracorporeal light observation switch 47 provided in the light source device 3 is capable of inputting an ON signal to the filter moving motor 31 and the one-shot circuit 48 provided in the control device 4 . This one-shot circuit 48 sends a control signal to the control circuit 46 when an ON signal is input.

In the timing chart of FIG. 11, the filter movement motor 31 starts driving at 1111 at the falling edge of the in-body observation switch 470 ON signal, and the color transmission filters 23R, 23G, 23B of the rotating colorfine 24 are moved out of the optical path after the movement period T1. They are supposed to evacuate. Further, at the fall of the ON signal, the one-shot circuit 48 outputs a one-shot pulse with a slightly longer output pulse width T6 to the control circuit 46 during the filter movement period TI. Con 1-E
While this one-shock 1-pulse is being input, the 3-pulse circuit 46 disables each frame memory 43R, 43G, 43B from being occupied, and makes the image on the monitor 6 a color still image. The rotary hler filter 24 is evacuated, and after the period T6, the control 1 call circuit 46 stores each frame memory 43R,
43G and 43B are divided by yR from the westward movement prohibited state. In this case, since the illumination light is white light, the FM of monitor 6
@ indicates a black and white video.

When the confirmation of the tip position using the extracorporeal transmitted light is completed, the extracorporeal observation switch 47 is turned on. At the falling edge of this ON signal, the rotating color filter 24 is activated by the color transmission filters 23R, 2.
3G and 23B into the optical path, and after the movement period T3, the insertion into the optical path is completed. Furthermore, at the fall of this ON signal, the one-shot circuit 48 again sends out a pulse with an output pulse width T6 to the =1-1~roll circuit 46. The control circuit 46 controls each frame memory 43R, 43G while this pulse is being input.

43B is set to a write-inhibited state, and the image on the monitor 6 is made into a black-and-white still image. After the movement JUJ T3, the rotating color filter 24 starts rotating R (red) and G (green).

The illumination light divided into each color light of B (portrait) is sequentially emitted.
Ru. After the period 6, the control circuit 46 releases the anti-aging state of each frame memory 43R, 43G, 43B, and a color moving image is displayed on the monitor 6.

According to this embodiment, since the image is a still image only during the period when the rotating color filter 24 moves (TI, T3), a moving image can be displayed on the monitor 6 even during in vitro observation, although it is a black and white image. Visually checking the movement of the insertion section 7 is safe, and can also prevent unsightly images from being output when the rotating color filter 24 moves.

FIGS. 12 and 13 show a third embodiment of this embodiment.

In this embodiment, the rotating color filter 24 is retracted from the optical path.
The light source lamp 22 is kept in a flash state for a period of time. In this embodiment, a structure and operation different from those of the first embodiment will be described.

An extracorporeal light vA detection switch 47 provided in the light source device 3 is capable of inputting an ON signal to the filter moving motor 31 and the flash circuit 49.

When the flash circuit 49 receives an ON signal, it causes the light source lamp 22 to emit a flash, and at the same time sends a flash signal synchronized with the flash emission to the control circuit 46.

In the timing chart of FIG. 13, the filter moving motor 31 starts to drive at the fall of the ON signal of the external observation switch 47, and the color transmitting filters 23R, 23G, and 23B of the rotating collar 24 are moved out of the optical path. It is supposed to move to . Then, after the movement period T1, the color transmission filters 23R and 23G.

23B is retracted out of the optical path.

By receiving this ON signal, the four flash circuits output a pulse with a pulse width T5 as shown in FIG. 11(d) to the control circuit 46 with a fixed pause period T7, and The light b1 of the light source lamp 22 is increased in synchronization with the . The control circuit 46 controls each frame memory 43R, 43G, 4 during this pulse width T5.
The image on the monitor 6 is set as a still image with 3B set to a hit-prohibited state, and each frame memory 43R, 4 during the pause period TI.
Release the write-inhibited state of 3G and 43B. When the write protection is canceled, since the illumination light is white light, the image on the monitor 6 becomes a black and white moving image. The flag 1 circuit 49 continues to send out pulses until it receives the ON signal J from the extracorporeal light observation switch 47.

When the TAr Kx of the tip position using the extracorporeally transmitted light is completed, the extracorporeal observation switch 47 is turned on. At the fall of this ON signal, the rotating color filter 24 turns the color transmission filter 2
3R, 23G, and 23B are inserted into the optical path and begin moving immediately, and end the insertion after a moving period T3. Further, at the fall of the ON signal, the flash circuit 49 stops outputting the next pulse, and the control circuit 46 releases the occupancy inhibited state of each frame memory 43R1/13G, 43B. After the movement period °3, the rotating color filter 24 starts rotating and separates each color light of R (red), G (green), and B (N) for N1 minutes.
A color moving image is displayed on the monitor 6 by sequentially emitting the illumination light.

J3, the flash period T5 is longer than the moving period T1 ゛<L, U moving period G! I-r 1 may be Jζ which becomes a still image. Furthermore, while the pulse is being input to the control circuit 46, the image on the monitor 6 may be a still image.

According to this embodiment, the image on the monitor 6 is made into a still image only during the flash period T5, and moving images can be observed both during the movement of the rotating color filter 24 and during the observation of external light. , J: is safe, and at the same time, it is possible to prevent unsightly images such as pure white images caused by flash.

[Effects of the Invention] As explained above, according to the present invention, by making the monitor image a still image, the image can be easily viewed even during the period when the color separation filter is inserted or removed, and the operability is improved. ■It is possible to improve safety by assuming that the condition is not good.

[Brief explanation of the drawing]

FIGS. 1 to 5 relate to the first embodiment of the present invention.
The figure is a block diagram explaining the electronic endoscope device, FIG. 2 is a timing chart diagram explaining the operation, FIG. 3 is an explanatory diagram of the entire electronic endoscope device, and FIG. 4 is a diagram showing the structure of the frame memory. 5 is a timing chart explaining the operation of FIG. 4, FIGS. 6 and 7 are modified examples of the first embodiment, and FIG. 6 is a frame memory diagram. 7 is a timing chart explaining the operation of FIG. 6, and FIGS. 8 and 9 are other modifications of the first embodiment, and FIG. 8 is a frame memory 9 is a timing chart explaining the operation of FIG. 8, FIGS. 10 and 11 relate to the second embodiment of the present invention, and FIG. 10 is an electronic endoscope! 1vtlff
FIG. 11 is a timing chart explaining the operation, FIG. 12 and FIG. 13 are related to the third embodiment of the present invention, and FIG. 12 is a block diagram explaining the multiplex endoscope device. The block diagram, FIG. 13, is a timing diagram for explaining the operation. 1...Electronic endoscope vi2!2...Endoscope 3...Light source device 4...Control device 6...Monitor
22...Light source lamp 24...Rotating color filter 31...Filter moving motor 34...Solid R element 46...Control circuit

Claims (1)

[Scope of Claims] Color separation means capable of separating white light emitted from a light source into each color light in a field-sequential manner; moving means capable of inserting and removing the color separation means onto an optical path of the light source; and the color separation means. Therefore, an imaging means capable of imaging a subject illuminated by illumination light separated into each color light and converting the subject image into an electrical signal; and a signal processing unit that performs video processing on the electrical signal obtained by the imaging means. means, display means capable of receiving the output signal of the signal processing means and displaying the subject image on a screen, and making the subject image displayed by the display means a still image at least while the moving means is in operation. An electronic endoscope device characterized by comprising: an image stilling means capable of performing the following steps.