JPH01170436A - Electronic endoscopic apparatus - Google Patents

Abstract

PURPOSE:To enhance safety, by obtaining an image to be observed by succeedingly taking an image on the basis of a timing signal by a solid-state image sensing element when the rotation of a rotary color filter is stopped to display the signal of the taken image on a monitor. CONSTITUTION:When the rotation of a rotary color filter 16 is stopped by the trouble of a motor 15, the stop position of the rotary color filter 16 becomes the position, when a green transmitting filter 18G is interposed on a light path, by a wt. part 22 and, in this state, the illumination light of a lamp 14 transmits through the green filter to be projected on the incident end of a light guide 9. That is, an object is irradiated with green illumination light. Therefore, even in such a state that the rotary color filter 16 is stopped, the image of the object can be taken and, by looking the image on a monitor 6, the operation drawing an electronic scope 2 out of the body can be safely performed and the operation drawing a treatment device out of the body can be also performed. Further, since an image to be observed can be obtained, treatment using the treatment device can be succeedingly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic endoscope device that is capable of obtaining a moving image using a pseudo synchronization signal when the rotation of a rotating color filter stops.

[Prior Art] In recent years, by inserting an elongated insertion section into a body cavity, it is possible to observe eight internal organs in the body cavity, and when necessary, perform various therapeutic procedures using a treatment instrument inserted into a treatment instrument channel. Optical endoscopes are widely used.

Also, an electronic endoscope (also referred to as an electronic scope) that uses a solid-state R@ element such as a charge-coupled device (COD) as an imaging means.
Various proposals have also been made.

By the way, some of the above-mentioned electronic scopes have built-in color filters that produce color HX images under white illumination, and others that are sequentially illuminated with illumination light in multiple wavelength ranges such as red, green, and blue. There is also a frame-sequential color imaging type that performs color image transfer by combining signals captured by multiple images. An example of this prior art is, for example, Japanese Patent Laid-Open No. 56-51186.

The above-described field-sequential color imaging type electronic scope requires a light source device (hereinafter referred to as a field-sequential light source device) that sequentially outputs illumination light of red, green, blue, etc., as described above. In this case, a motor rotates a rotary color filter in which a plurality of color transmission filters are attached to a disk-shaped filter frame that generally forms a filter window, and the color transmission filters are successively inserted into the illumination optical path of a white lamp. things are widely used.

By the way, in the device using the above-mentioned rotating color filter, in synchronization with the rotation of the rotating color filter, the drive signal for reading out the signal to the solid-state image carrier and the writing and reading of the signal carried in the frame memory are controlled. There is. Therefore, if the rotation of the rotating color filter stops due to a motor failure or failure of the motor drive circuit, etc., even if the illumination light can be irradiated to the subject, the signal that controls the drive signal or the image transferred to the frame memory section will be lost. A timing signal for controlling writing and reading of signals is no longer applied.

[Problems to be Solved by the Invention] When the above-mentioned timing signal etc. are no longer applied, the frame memory cannot perform the normal image updating, and a still image is displayed on the monitor screen.

In the case of the above-mentioned still image, for example, when pulling out the insertion part of a 1A speculum inserted into a body cavity, an observation image cannot be obtained, making it difficult to safely pull it out without damaging the inner wall of the body cavity. It may become. Further, when a treatment instrument is used, it may be difficult for non-prisoners to safely store the distal end side of the treatment instrument in the treatment instrument channel. Furthermore, if the rotation of the above-mentioned rotating color filter stops in the middle of a treatment, and if the minimum necessary treatment must be continued, it is essential to obtain observation images (videos) (not still images) for safety reasons. Desired from the outside.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an electronic endoscope device that can improve safety by allowing observation images to be obtained even when the rotation of the rotating color filter stops. shall be.

[Means and effects for solving the problem] In the present invention, a pseudo signal generating means generates a timing signal to a driver that reads out a solid-state WE element and a timing signal that controls writing and reading to a frame memory section. is provided, so that when the rotation of the rotary color filter stops, the image carried by the solid-state image carrier and the imaged signal can be displayed on the monitor in response to the timing signal.

[Example] Hereinafter, the present invention will be specifically explained with reference to the drawings.

Figures 1 to 6 relate to the first embodiment of the present invention.
The figure shows the entire configuration of the first embodiment (111), FIG. 2 is a schematic perspective view showing the light source device section, FIG. 2 is an overall configuration diagram of the first embodiment, and FIG. 3 is a rotation detection circuit. Circuit diagram, Figure 4 is an explanatory diagram of the operation when the rotating color filter is rotating,
FIG. 5 is a block diagram of the pseudo signal generator, and FIG. 6 is a timing chart for explaining the operation of the pseudo signal generator. - is a diagram.

As shown in FIG. 1, the electronic endoscope device 1 of the first embodiment includes an electronic scope 2, a field-sequential light source unit 3 that supplies illumination light to the electronic scope 2, and a 1) η distribution scope. The video processor 5 includes a No. 13 processing section 4 that performs signal processing for the signal processing section 2, and a monitor 6 that displays the video signal outputted from the signal processing section 4 in color.

The electronic scope 2 has an elongated insertion section 8, into which a light guide 9 is inserted, and the light guide 9 is connected to a universal cord 1 extending from the operation section 11.
By connecting the connector 13, which is inserted roughly through the interior of the light guide 9 and attached to the end of the universal cord 12, to the connector receiver of the video processor 5, illumination light from the light source unit 3 is applied to the incident end surface of the light guide 9. Supplied.

That is, the white light from the light source lamp 14 is collimated by the concave mirror portion and is irradiated onto the rotating color filter 16 which is rotationally driven by the motor 15 . This rotating color filter 16 is
As shown in FIG. 2, three fan-shaped windows (or openings) formed in a disc-shaped filter frame 17 made of a light-shielding member are colored red and green.

Blue color transmission filters 18R, 18G, and 18B are attached.

Therefore, the rotating color filter 16 is rotated by the motor 15.
When the lamp 14 is rotated, color transmission filters 18R, 18G, and 18B are sequentially interposed on the optical path of the lamp 14, and color transmission filters 18R, 18G, and
It is colored blue. This colored light is transmitted through the condenser lens 19
The light is focused at and irradiated onto the incident end face of the light guide 9.

A rotating color filter 16 is attached to the rotating shaft of the motor 15 via a clutch 21.
1 is designed to be activated when the rotation of the rotating color filter 16 is stopped.

Further, in the rotating color filter 16, a weight portion 22 is formed at the peripheral edge portion of the filter frame 17 on the opposite side of the green color transmitting filter 18G, for example. This weight part 22
When the rotation of the rotating color filter 16 stops, the gravity acting on the weight portion 22 causes the weight portion 2 to
The rotating color filter 16 stops at the lowest position as shown in FIG.
A green color transmission filter 18G is interposed on the illumination optical path. Therefore, even if the rotating color filter 16 stops rotating, the illumination light from the lamp 14 is supplied to the incident end surface of the light guide 9 through the green color transmission filter 18G. In other words, when the rotating color filter 16 stops rotating, the subject is constantly illuminated with green illumination light.

By the way, when the rotating color filter 16 is rotated normally, it is sequentially illuminated with red, green, and blue illumination light. Therefore, the object illuminated sequentially with red, green, and blue colored light is illuminated by the objective lens 23 provided at the distal end of the insertion section 2.
As a result, an optical image is formed on the image plane of the C0D 24 as a solid-state decoy image element arranged at the focal plane. This optical image is photoelectrically converted and accumulated as electric charges. By applying a drive signal from the driver 25, this C0
The signal output from the D 24 is amplified by the amplifier 26 and then input to the image quality/color tone adjustment circuit 27. After the image quality and color tone adjustment such as white balance adjustment is performed in the image quality/color tone adjustment circuit 27, the A/D converter 28
is converted to digital 1 by frame memory section 2.
9 is temporarily stored. This frame memory section 29 is composed of, for example, three sets of frame memories, each set is composed of a pair of frame memories, and read/write is performed alternately. For example, when illuminating with red color light, a drive signal is applied to the C0D 24 at the end of the illumination period, and the signal read from the C0D 24 is written into one of the frame memories for red. green,
When illuminating with each color of blue light, it is stored in frame memories for green and blue, respectively.

The timing of the end of the illumination period of each color light (or the exposure period of C0D24) is determined by the rotational position sensor 31 disposed oppositely at one location on the periphery of the rotational color filter 16, as shown in FIG. 1 or 2. Detected by. This rotational position sensor 31 is composed of, for example, a photoreflector, and irradiates the periphery of the filter frame 17 of the rotary color filter 16 with light of L[D. ．． When light is irradiated on..., the reflected light is received by the photodiode (or phototransistor) that forms the rotational position sensor 31 with the LED, and is reflected by these reflecting parts 32, 32... The rotational speed of the motor 15 can be detected by the pulsed signal output from the photodiode when the reflection section 32
, 32. One of them is to greatly increase the reflection width and is used as a start pulse or one rotation detection signal. The position of this start pulse makes it possible to detect the filter positions of the respective color transmission filters 18R, 18G, and 18B. (Incidentally, a sensor for detecting the rotational speed and a rotational position sensor may be provided.) The output signal of the rotational position sensor 31 is input to the amplifier 33 at 9 degrees as shown in FIG. 1, and after being amplified, The signal is input to the waveform shaping circuit 34 and subjected to waveform shaping. This waveform-shaped encoder pulse signal is input to the rotation detection circuit 35 and is also input to the timing adjustment circuit 37 via the switch 36.

For example, as shown in FIG. 3, the rotation detection circuit 35 receives encoder pulses from the waveform shaping circuit 34 (TT
A one-shot multivibrator 41 (hereinafter abbreviated as OMM) such as L) 74121, an integrating circuit 42 that integrates the output signal of this 0MM41, and an output signal of this integrating circuit 42 formed by a resistor R and a capacitor C. It is composed of a comparison circuit 43 that compares the voltage with a constant voltage VR.

In this rotation detection circuit 35, when the encoder pulse is input, the output level of the integration circuit 42 is held higher than the reference voltage VR, and the output of the comparison circuit 43 becomes "LIT", and it is determined that the rotation is in progress. , when the rotation stops, the encoder pulses are no longer input, so the integration circuit 42
The output level of becomes lower than the reference voltage VR, and the output of the comparator circuit 43 becomes HJl, and it is determined that the motor has stopped. When it is determined that the motor has stopped, the clutch 21 attached to the rotating shaft of the motor 15 is operated by this output, the rotating color filter 16 and the motor 15 are separated, and the motor 15 is left with no load. become a state.

In addition, in the case of the above "H", switch 36 is switched,
The output signal of the pseudo signal generator 45 is input to the timing adjustment circuit 37. This timing adjustment circuit 37, when the switch 36 is not switched,
A signal from the rotational position sensor 31 side is input. A start pulse (for example, a large pulse width) in the encoder pulse generates a read pulse at the timing shown in Fig. 4 (that is, at approximately 11 m5 cycles), and the drive signal is output from the driver 25 to the C0D 24 using this read pulse. Decide when to do so.

At the same time, a write enable signal is output to the frame memory section 29, and the frame memory section 29 is held in the light mode (during the period when the drive signal is output from the driver 25), and the red, green, and blue lights are turned on. The write/read switching timing is controlled so that the original IS video signal (indicated by R9G, B in FIG. 4) is written into the frame memory section 29.

When the R, G, and B video signals are fed into the frame memory section 29, the R, G signals on the written side.

The video signals are simultaneously read out from the frame memory for B, and
/A converter 46 converts it into an analog signal and adds
The signal is inputted to an output amplifier 48 through a device 47.

Incidentally, while the video signals are being simultaneously read out in this manner, the signal read out from the C0D 24 is input into the other frame memory.

The video signal input to the output amplifier 48 is amplified,
It is input to the monitor 6 and displayed in color.

Note that when data is read out from the frame memory at the same time, one frame is approximately 33 m5 in cycle.

When the output of the rotation detection circuit 35 becomes H'', the switch 3G is switched and a timing signal is generated in the timing adjustment circuit 37 based on the output signal of the pseudo signal generator 45.

The configuration of this pseudo signal generator 45 is shown in FIG.

A clock output of the reference signal oscillator 51 having a period of approximately 5.5 mS, for example, is input to a hexadecimal counter 52, which outputs frequency-divided pulses of Qo, Ql, and C2 as shown in FIG. The output signal pulses of the hexadecimal counter 52 are input to a conversion circuit (hereinafter referred to as BCD circuit) 53 that converts from binary to decimal, and as shown in FIG.
, Ys, etc. are output. This BCD circuit 53
The output pulses of Yl, Ys, and Ys are OR circuit 5 made by three people.
4, and its OR output is input to a NAND circuit 55. Further, the output pulse of the reference signal oscillator 51 is passed through an inverter 56, and then input together with the YO ratio output of the BCD circuit 53 to a NAND circuit 57 to generate a start pulse as shown in FIG.

Further, a read pulse as shown in FIG. 6 is generated at the output of a NAND circuit 55 to which the output of the inverter 57 and the output of the OR circuit 54 are input. The output signal of the pseudo signal generation circuit 45 causes the timing adjustment circuit 37 to
outputs a timing signal similar to that when the rotating color filter 16 is rotating to the driver 25 or the frame memory section 29. In this case, the rotating color filter 16 actually stops rotating, and when the rotation stops, the green color transmission filter 18G is interposed on the illumination optical path by the weight section 22. . Therefore, in this case, the m'fJ4 signal under the illumination light of the green wavelength is stored sequentially in the frame memories for red, green, and blue, and these are read out simultaneously, and the signals for the R, G, and B colors are sequentially stored in the frame memories for red, green, and blue. Although the signal is treated as a signal and processed, it is displayed in black and white on the monitor 6.

Further, the rotation detection circuit 35 has an output of 11 H1
1, a predetermined character is generated in response to the character generation signal 58, and the character output from the character generation circuit 58 is superimposed on the video signal by the adder 47, and displayed on the monitor screen using, for example, a rotating color filter. 16 is in a stopped state, or a character or the like is displayed to notify that the rotation is stopped.

The C0D 24 used in the first embodiment is preferably a frame transfer method or a vertical interline transfer method. In other words, since illumination light is constantly outputted by the green color transmission filter 18G, in the line transfer method in which the m image section (photosensitive section) serves both imaging and transfer functions, the imaged signal is superimposed even during transfer. , the image may become slightly unclear. On the other hand, with frame transfer type or vertical interline transfer type, the signals are output sequentially after being transferred (transferred) to a non-photosensitive storage section or transfer section, so they are hardly affected. .

Therefore, you can get clear images. However, if the frequency of the readout clock is high, it is possible to obtain an image that is virtually unaffected by the line transfer method, and C0D24s with high operating frequencies have been developed, so the line transfer method Sometimes even something is enough. Furthermore, in this case, when the electronic scope is pulled out of the body, or when the treatment with the treatment tool is stopped and the electronic scope is pulled out of the body, the line transfer method has sufficient advantages.

According to this first embodiment, when the rotation of the rotating color filter 16 stops due to a failure of the motor 15, etc., the weight portion 22 moves the stopping position of the rotating color filter 16 so that the green color transmission filter 18G is on the optical path. In this state, the illumination light from the lamp 14 passes through the green light and is irradiated onto the incident end of the light guide 9. In other words, the subject is illuminated with green illumination light. Therefore, even when the rotation of the rotating color filter 16 is stopped, it is possible to image the subject, and by viewing the image on the monitor 6, the electronic scope 2 can be safely pulled out of the body. It is also possible to safely pull out the treatment instrument outside the body.

Furthermore, since an observation image can be obtained, treatment using the treatment instrument can be performed successively.

Therefore, according to the first embodiment, even if the rotation of the rotating color filter 16 stops, a moving image can still be obtained, although it is a monochrome image, so that highly safe countermeasures can be taken.

FIG. 7 shows the main parts of the second embodiment of the present invention.

In this second embodiment, the transparent portion 60 and the bottle hole 61 are
The rotary color filter 63 of the filter frame 62 is provided with a rotary color filter 63. This bottle hole 61 is provided at a position from the outside in the radial direction of the green transmission filter 18G.
is the provision.

A bin 65 attached to an arm 64 is disposed facing the rotary color filter 63 at the lowest part on the circumference relative to the radius of the bin hole 61, and the arm 64 rotates around a rotation center position 66. It is possible and this arm 6
The bottle 65 can be inserted into the bottle hole 61 by moving the plunger 67 to which the bottle 4 is attached upward from the position shown in FIG. The plunger 67 is attracted and moved upward by applying a drive current to the solenoid 68.

A sensor 6 facing one location on the periphery of the rotating color filter 63 for detecting the number of rotations of a photoreflector, etc.
9 is provided, and the output of this sensor 69 is amplified by an amplifier 70 and input to a rotation speed detection circuit 71. The sensor 69 obtains a pulse-like signal by receiving reflected light when light is irradiated onto reflective portions provided at predetermined intervals on the periphery of the filter frame 62, for example. This pulse-like signal is amplified and input to the rotation speed detection circuit 71, and by comparing the counted value with the normal rotation speed, an abnormality in the rotation speed is detected. If this abnormality is detected, it is used as a control signal. Outputs a rotation speed stop signal. This rotational speed stop signal is amplified by an amplifier 72 and then applied to a motor 73.
No rotational drive signal is supplied to 3.

Also, a control signal is applied to the solenoid 68 together with the rotation speed stop signal, a driving current is applied to the solenoid 68, the plunger 67 is attracted, the arm 64 is rotated, and the bin 65 is rotated.
corresponds to the filter frame 62, and the bottle hole 61 corresponds to this bottle 65.
When the pin 65 reaches the position facing the pin hole 61, the rotation of the rotating color filter 63 is stopped. In this state, the white light beam 74 of the lamp 14 hits the transparent portion 60, and the white light is supplied to the light guide 9 through the transparent portion 60 of the mouth. At the same time, similar to the first embodiment, the pseudo signal generator is operated to generate read pulses and the like.

In addition, in this embodiment, since the transparent portion 60 is provided,
During normal rotational driving, after the illumination period through the transparent section 60, the signal read from the C0D 24 is not temporarily stored in the frame memory section, but is swept away. The rest of the structure is the same as that of the first embodiment.

In this embodiment, the functions of the position detection means and the control means are combined.

However, as shown in FIG. 9, the functions of the position detection means and the control means may be separated.

A rotating color filter 63 is attached to the rotating shaft of the motor 73 via a brake 75.

Further, as a position detection means, an LED 76 and a photosensor 77 such as a photodiode are arranged facing each other so as to sandwich the filter frame 62. Thus, when the bottle hole 61 reaches between the LED 76 and the photosensor 77, the photosensor 77 is configured to be able to receive the light from the LED 76. Therefore, when an abnormal rotation speed is detected by the rotation speed detection circuit, a control signal is applied that does not supply rotation drive power to the motor 73, and when the photo sensor 77 receives the light from the LED 76, the brake 75 is operated and the rotation speed is The rotation of the color filter 63 is stopped. As in the first embodiment, the pseudo signal generator is operated to generate read pulses and the like, thereby making it possible to obtain a moving image.

Note that the position detecting means is not limited to the above-mentioned LED 76 and photosenser 77, and other position detecting means may be used.

FIG. 10 shows the main part of a fourth embodiment of the present invention.

In this fourth embodiment, the rotating color filter 81 is the same as the filter frame 6 in the rotating color filter 63 shown in FIG.
2, the bottle hole 61 is not provided, but the weight portion 84 is provided.
＝It is a thing.

Therefore, as in the second embodiment, when the rotation of the rotating color filter 81 stops, due to the gravity acting on the weight part 84,
The weight portion 84 stops at the lowest position as shown in FIG. In this state, the light beam 85 passes through the continuous portion 60 and is incident on the light guide. Therefore, when the rotation of the rotating color filter 81 stops,
It is possible to reliably prevent the light path from being blocked by the light blocking portion of the filter frame 62.

The fourth embodiment uses gravity to prevent the stopping position of the rotating color filter 81 from blocking the illumination light.
The fifth embodiment shown in FIG. 11 utilizes magnetic force.

In this rotating color filter 91, the filter frame 92 (
For example, a red color transmission filter 18 (without a weight part)
The permanent magnet 93 is attached to a position near the periphery on the opposite side of R. Further, in order to detect the position of the permanent magnet 93, a Hall element 94 as a rotation detection sensor is provided opposite one location on the periphery of the rotating color filter 91. Furthermore, permanent magnets 95 are attached to face appropriate locations on the periphery of the rotating color filter 91. This permanent magnet 95 is connected to the rotating color filter 91.
When the filter stops, the magnet 93 attached to the filter frame 92 is configured to stop with the north and south poles attracted to each other. In this stopped state, the light flux is transmitted through the color transmission filter 83R.
, 38G, and 38B, and the mounting position of the permanent magnet 95, for example, is set so that the light is not blocked.

Note that an electromagnet may be used instead of the permanent magnet 95.

In addition, since the magnet 93 is attached, it can also be used as a rotation sensor.

FIGS. 12 and 13 show the main parts of a sixth embodiment of the present invention.

In this sixth embodiment, the filter frame 101 is colored red.

A motor 104 that rotates a rotating color filter 103 to which green and blue color transmission filters 18R, 18G, and 18B are attached.
is attached to the top of the rotating arm 105, and by applying a driving current to the solenoid 106, the plunger 107
arm 105 against the biasing force of spring 108.
is moved in the direction of arrow B, and at the same time, the rotating color filter 103 is made to be able to rotate in the direction of arrow C about the rotation pin 109. The arm 105 is normally held in contact with a stopper 111 by a spring 108 whose one end is attached to a housing 110 or the like. In this state, the light beam 112 is transmitted through the rotated color transmission filter 1.
The light is supplied to the light guide side through 8R, 18G, and 18B.

When drive [1 is supplied to the solenoid 106, the arm 105 rotates and the rotating color filter 103 retreats from the optical path. Therefore, in response to a rotation stop or abnormal rotation speed signal from the rotation detecting means (not shown) of the rotation color filter 103, a drive signal is applied to the solenoid 106 to evacuate the entire rotation drive system including the rotation color filter 103 from the optical path. I'm trying to make it possible.

FIGS. 14 and 15 show main parts in a seventh embodiment of the present invention.

In the sixth embodiment, the rotating color filter 103 is moved out of the optical path by rotating the arm 105, but in the seventh embodiment, it is moved out of the optical path. A fixed base 121 to which a motor 104 that rotationally drives the rotating color filter 103 is attached is movable on a sliding surface 122 in the direction of the arrow or the opposite direction. This fixed base 121 is urged in a contracting direction by a spring 123, and is normally held in a position where it abuts against a stopper 124 as shown in FIG. 14, and in this state, the rotating color filter 103 is interposed on the optical path. become.

Therefore, as the rotating color filter 103 rotates, the light beam 112 is transmitted through the color transmission filters 102R, 102G, 102
Illumination light is supplied to the light guide side through B sequentially.

By the way, the fixing base 121 is attached to a plunger 126 that can be moved by suction by a solenoid 125 disposed on the opposite side to the biasing direction of the spring 123, and resists the biasing force of the spring 123 by energizing the solenoid 125. Then, the fixed base 121 is moved in the direction of the arrow so that the rotating color filter 103 can be retracted from the optical path.

In other words, in this embodiment as well, the rotating color filter 1030
By supplying a drive current to the solenoid 125 based on the signal from the rotation detection means, the rotation drive system including the rotation color filter 103 can be evacuated from the optical path.

FIG. 16 shows the main parts of an eighth embodiment of the present invention.

In the seventh embodiment, the solenoid 125 is energized to move the rotary drive system including the rotary color filter 103, but in the eighth embodiment, the moving motor 131 is used to move the rotating drive system including the rotating color filter 103 to the optical path. is returned to the optical path.

A fixed base 132 to which a rotary drive system including the rotary color filter 103 is attached is mounted on, for example, a sliding surface 133. This fixed base 132 has a threaded hole formed in the horizontal direction, and a shaft 135 into which a moving threaded portion 134 is screwed passes through this threaded hole. This shaft 135 is rotatably supported by bearings 136 and 136 on both sides of the threaded portion 134, and one end is attached to the rotating shaft of the motor 131, so that the motor 131 can be rotated, for example, in the direction of arrow E. This allows the fixed base 132 to be moved in the direction of arrow F.

By the way, two microswitches 137.1 are provided on the sliding surface 133 as means for positioning the fixed base 132.
38 is installation. Thus, when the motor 131 is rotated, the fixed base 132 is positioned at a position where the microswitches 137 and 138 are turned off. For example, the first
In Figure 6, the lever of the microswitch 137 is
Rotation of the motor 131 is stopped at the position where it is turned off by being pressed by 32. In this state, the rotating color filter 103 is maintained in the optical path. On the other hand, in this state, for some reason, the rotating color filter 1
When the rotation detecting means detects that the rotation of the motor 131 has stopped or that the number of rotations has decreased abnormally, a drive current is supplied to the motor 131 via the microswitch 138. This drive current causes the shaft 135 to rotate in the direction of arrow E.
The fixed base 132 is moved in the direction of arrow F, and the rotation of the motor 131 is stopped at a position where the lever of the microswitch 138 is pressed and turned off. In this state, the rotating color filter 103 is retracted from the optical path, and the light guide is irradiated with white light from the lamp.

In each of the above-mentioned embodiments, the rotating color filter is designed to output light in the three primary colors of red, green, and blue (white light in the transparent section), but it is also possible to output illumination light in complementary colors to these. A color transmission filter may be used, or other combinations may be used.

In addition, when the rotating color filter is stopped, the light from the white lamp can pass through the transparent part to supply white light to the light guide, or the rotating color filter can be retracted from the optical path to supply white light to the light guide. It can also be used as a light source for fiberscopes. It can also be used as a light source for an electronic scope with a built-in color filter.

Note that the present invention is not limited to an electronic scope with a built-in solid-state image sensor, but also a television camera 1 with a built-in CCD 143 in the eyepiece 142 of a fiber scope 141 as shown in FIG.
The external television camera equipped with the 44 can also be used with the electronic endoscope 145.

A light guide 147 is inserted into the insertion section 146 of the fiberscope 141, and a light guide cable 149 extending outside from the operating section 148 is further inserted. Illumination light is supplied by connecting a connector 150 attached to the end of this light guide cable 149 to a light source device.

The object illuminated by the illumination light emitted from the output end face of the light guide 147 is imaged by the objective lens 151 on the input end face of the image guide 152, and
The light is transmitted to the output end face on the second side. Therefore, it can be observed with the naked eye through the eyepiece lens 153 disposed opposite to this exit end face. Further, when the television camera 144 is attached to the eyepiece section 153, an image is formed on the CCD 143 by the imaging lens 154. By connecting the connector 156 of the signal cable 155 extending from the television camera 144 to the connector receiver of the signal processing unit, the signal captured by the CCD 143 can be processed and displayed on a monitor in the same way as in the case of an electronic scope. .

The same applies to the case where a rigid endoscope is used instead of the fiber scope 141 described above.

In each of the above embodiments, a means is provided to prevent the light shielding portion from blocking the illumination optical path when the rotation of the rotating color filter stops, but the present invention is not limited to this.
When the rotating color filter stops, the rotating color filter may be manually rotated to bring one of the color transmitting filters onto the illumination optical path.

By the way, in the first embodiment, similar to the regular rotation speed control in which the rotating color filter 16 is rotated 30 times per second, the pseudo signal generator 45 uses the circuit configuration shown in FIG. In this first embodiment, the start pulse and read pulse are generated at timings synchronized with the oscillation output of the oscillator 51. Even if it is not such a synchronous type, it can be configured by a combination of a simple oscillator and a monomulti.

Further, in each embodiment, in reality, only a monochrome angle of view can be obtained, so it is not limited to the one that generates three read pulses for R, G, and B, but any one of them may be used. In this case,
In FIG. 5, the three-man OR circuit 54 is unnecessary, and Ys
, Y3, Ys is sufficient. Also, 2-
It can be configured with a simpler gate circuit, including decimal conversion.

[Effects of the Invention] As described above, according to the present invention, the pseudo signal generating means supplies the readout timing signal to the drive means for applying the readout drive signal to the solid-state image sensor, and the frame memory Since the means can be supplied with a write/read timing signal, a moving image can be displayed on the monitor even when the rotation of the rotating color filter has stopped.

[Brief explanation of the drawing]

Figures 1 to 6 relate to the first embodiment of the present invention.
Figure 2 is a block diagram showing the overall configuration of the first embodiment, Figure 2 is a schematic perspective view showing the light source device section in the first embodiment, Figure 3 is a circuit diagram of the rotation detection circuit, and Figure 4 is a rotation collar. An explanatory diagram of the operation when the filter is rotating, FIG. 5 is a configuration diagram of the pseudo signal generator, FIG. 6 is a timing chart diagram for explaining the operation of the pseudo signal generator, and FIG. 7 is a second embodiment of the present invention. 8 is a front view of the rotating color filter of FIG. 7, FIG. 9 is a side view of the main portion of the third embodiment of the present invention, and FIG. 10 is a diagram showing the main parts of the present invention. FIG. 11 is a front view showing the main parts of the fourth embodiment of the invention, FIG. 12 is a front view showing the main parts of the sixth embodiment of the invention. 13 is a side view of FIG. 12, FIG. 14 is a front view showing main parts of the seventh embodiment of the present invention, FIG. 15 is a side view of FIG. 14, and FIG. 16 is a side view of FIG.
The figure is a front view of the main part of the eighth embodiment of the present invention, and FIG. 17 is a side view showing a fiberscope equipped with an external television camera to which the present invention can be applied. 1...Electronic endoscope device 2...Electronic scope 3.
...Light source unit 4...Signal processing section 5...Video processor 6...Monitor 9...Light guide 14...Lamp 15...Motor 16...Rotating color filter 17... Filter frames 18R, 18G, 18B...color transmission filter 22...
・Weight part 35... Rotation detection circuit 45...
Pseudo signal generator Fig. 1 Fig. 2 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 12 Fig. 13 Fig. 11 Fig. 14 Fig. 15 Procedure correction Written (spontaneous) November 1j, 1988 1, Indication of the incident 1988 Patent Application No. 331483
No. 2, Name of the invention Electronic endoscope device 3, Relationship to the amendment person case Patent applicant address 2-43-2 Hatagaya, Shibuya-ku, Tokyo Name (037) Representative of Olympus Optical Industry Co., Ltd. Satoshi Shimoyama, Department 4, Agent Address: 7-4-4 Nishi-Shinjuku, Shinjuku-ku, Tokyo
.゛・(r; 1. On the 17th and 18th lines of page 10 of the specification, the words "...OMM and...this OMM..." are replaced with "...08M..." ...This 08M..." is corrected. 2. In the 5th line of the 13th page of Nishinaka details, "...33m.
``Let's go with 5...'' is replaced with ``...33 ll1s.''
(In the case of NTSC, all descriptions regarding numerical values below should be written with NTSC, >..."). 3. In the 15th line of page 22 of the middle box of the statement, "..." 83
R, 38G, 38B..." is replaced with "...18R.
118G, 18B..." will be corrected. 4. In the 20th line of page 24 and the 1st line of page 25 in Book I, [...102R, 102G. 102[3...] is replaced by ``...18R, 18G
, 18B..." first.

Claims (1)

[Claims] Field-sequential color imaging means that obtains a color image by rotating a rotating color filter equipped with a plurality of color transmission filters and combining signals photographed under illumination light in a plurality of wavelength ranges. An electronic endoscope device comprising: means for generating a pseudo synchronization signal when the rotating color filter stops rotating.