JPH0638134B2 - Illumination light supply device used for electronic endoscope device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination light supply device used in an electronic endoscope device in which an endoscope and a monitor TV are connected to each other.

(Prior Art) A publicly known electronic endoscope device will be described in detail. An insertion portion of an endoscope is inserted into a body cavity of a subject, and illumination light is emitted from an illumination window provided at a tip of the insertion portion. Then, the illumination light is reflected by the inner wall of the body cavity and returned, and enters from an observation window provided at the tip of the insertion portion, and the reflected light is arranged inside the observation window, such as a CCD solid-state image sensor. The light receiving unit receives the light and performs photoelectric conversion, and charges obtained as an image signal for each pixel are transferred at once to the storage unit of the solid-state imaging device (the transfer time is very short, about 0.1 msec). The image signal of each pixel stored in the storage unit of the solid-state image sensor is sequentially sent to the video circuit. The video circuit converts this image signal into a TV video signal and sends it to a monitor TV, which displays the image in the body cavity.

Interlaced scanning is performed on the monitor television as in the general television signal transmission / reception system. That is,
1 in 2 field scans, odd and even
Frame scanning is in progress. First, the odd-numbered field scanning roughly scans horizontally, and the even-numbered field scanning horizontally scans between the horizontal scanning lines. Such interlaced scanning is effective as a means for dealing with a fast-moving subject. It is also effective as a means for preventing flicker that occurs due to a short afterglow time of the phosphor of the CRT.
In the interlaced scanning, the image signal to be used for each field scanning is sent from the solid-state imaging device to the video circuit, and the video circuit sequentially outputs a television video signal for odd-even field scanning based on the image signal. .

By the way, when it is necessary to make a precise diagnosis, one frame scanning TV image signal is stored in the frame memory, and a still image is displayed on a monitor TV based on this TV image signal for observation or recording on an optical disc. Do or shoot with the camera.

(Problems to be Solved by the Invention) However, the still image may not be clear, and precise diagnosis may be difficult. The reason is as follows.

Illumination light is continuously emitted from the illumination window into the body cavity. Each pixel of the light receiving portion of the solid-state image pickup device continuously receives the reflected light for one field scanning time (1/60 seconds), and accumulates electric charges corresponding to the integrated value of the amount of received light. Therefore, when the movement of the observation target is fast, the amount of movement of the observation target in one field scanning time is stored as a blur of the image, and the sharpness of the image itself of the one field scanning is not sufficient. This principle is similar to the relationship between the shutter opening time of a camera and the sharpness of a captured image.
That is, in the camera, image information is continuously accumulated on the film during the time when the shutter is open, and therefore, if the opening time is long, the image of the fast-moving subject becomes unclear.

Moreover, the still image displayed on the monitor TV is 2
Since the images of the field scans of one time are overlapped and configured, the amount of movement of the observation target in one frame scanning time (1/30 seconds) eventually appears as a blur.

Therefore, the present inventor has developed the following technique. That is,
A chopper is arranged between the end of the illumination light transmission optical system of the endoscope and the light source, the chopper is rotated by a motor, and the window formed in the chopper crosses the luminous flux of the illumination light to illuminate intermittently. The light pulse is supplied to the illumination light transmission optical system. In this way, the time for storing image information (illumination time) in the solid-state imaging device is shortened to make the image clear.

However, the above-mentioned electronic endoscope apparatus may be inconvenient because the supply time of the illumination light pulse is constant. For example, when observing the upper gastrointestinal tract, in the esophagus that is affected by the heartbeat, the movement of the esophagus is severe and the image is likely to blur. The inner wall of the esophageal tube has a lighter color tone than other parts, and since it is observed closely, the illumination efficiency is high, so even if the illumination light pulse supply time is short and the illumination light amount is small, The solid-state image sensor can store a sufficient charge, and the image on the monitor TV does not become dark. On the other hand, since the stomach has a large volume and tends to be observed from a distance, the illumination efficiency is low, and a large amount of illumination light is required, so that it is preferable that the illumination light pulse supply time is long. Since the stomach moves slowly, image blurring is relatively small even when the illumination light pulse supply time is extended.

As described above, it has been desired to adjust the supply time of the illumination light pulse according to the observation location and the usage mode.

(Means for Solving Problems) The present invention has been made to solve the above problems, and its gist is to receive an image entered through an observation window of an endoscope by a solid-state image pickup element, Image signal from the element,
In the illumination light supply device used in the electronic endoscope device that is converted into the interlaced scanning type television video signal in the video circuit and the video is displayed on the monitor television based on the television video signal, A chopper arranged between the end of the illumination light transmission optical system of the mirror and the light source;
A motor for rotating the chopper, at least one window formed in the (c) chopper and intermittently supplying an illumination light pulse to the illumination light transmission optical system by traversing the luminous flux of the illumination light, and (d) illuminating the chopper A moving mechanism that moves in the direction intersecting with the light flux, and (e) transfers the image signal to be used for either one of the odd-numbered and even-numbered field scanning from the light-receiving unit of the solid-state image sensor to the storage unit. And a synchronization control means for controlling the rotation of the motor so that the centers of the supply times of the illumination light pulses coincide with each other, and the illumination light supply used for the electronic endoscope apparatus. On the device.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Reference numeral 10 in FIG. 1 denotes an endoscope.
Is an operation main body 11 having no eyepiece, and the operation main body 1
1 and the insertion part 12 extended from the front end. The insertion portion 12 is long and flexible and has a curved portion on the distal end side.
12a having a hard tip forming portion 12b on the tip side.
have. An observation window 14 is provided on the end face of the tip forming portion 12b.
And an illumination window 15 is provided. A solid-state image pickup device 16 composed of a CCD is arranged in the tip forming portion 12b.
Are optically connected via a convex lens 17. The signal line 13 is connected to the solid-state image sensor 16. The illumination window 15 is optically connected to one end portion 18a of the optical fiber bundle 18 (illumination light transmission optical system).

One end of a cable 19 is connected to the lower surface of the operation body 11, and the other end of the cable 19 is connected to a processing box (not shown). The optical fiber bundle 18 and the signal line 13 reach the inside of the processing box through the insertion portion 12, the operation body 11, and the cable 19.

An illumination light supply device 20 is built in the processing box. The illumination light supply device 20 has a light bulb 21 as a light source. The light bulb 21 is attached to the center of a shade 22 made of a concave mirror, and the light of the light bulb 21 is reflected by the shade 22 to be condensed and supplied to the other end 18b of the optical fiber bundle 18.

Further, the illumination light supply device 20 has a servo motor 25 and a disk-shaped chopper 30. The central portion of the chopper 30 is fixed to the output shaft 25a of the servomotor 25.
The chopper 30 has a first window 31 and a second window 32a which are continuous with each other. To be more specific, the chopper 3
The second window 32a is formed by cutting out the peripheral portion of 0 in a relatively wide angle range, for example, 180 °.
The other peripheral portion having the same diameter as the window 32a is the second shielding portion 32b. The second window 32a is located closer to the center than the second window 32a.
A first window 31a is formed so as to connect with the first window 31a. The angle range of the first window 31a is narrower than that of the second window 32a and is, for example, 90 °. The other portion having the same diameter as the first window 31a becomes the first shielding portion 31b.

Magnets 33 and 34 are attached to specific portions of the shields 31b and 32b of the chopper 30, respectively. Also, chopper 3
A position sensor 35, which is a proximity switch, is arranged near 0, and detects the position of the magnet 33 or the magnet 34 on the chopper 30.

The motor 25 and the chopper 30 are moved by a shifter 36 (moving mechanism) in a direction orthogonal to the optical axis of the luminous flux A of the illumination light. The shifter 36 has a solenoid (not shown), and when the solenoid is excited, the magnetic force causes the rod 36a to retract, and when the solenoid is de-excited, the return spring (not shown) causes the rod 36a to project. ing. The tip of the rod 36a is connected to the motor 25.

The video circuit 40 and other electric circuits are built in the processing box. The video circuit 40 is connected to the solid-state image sensor 16 via the signal line 13. The video circuit 40 includes a frame memory 42 through a processing circuit 41.
And the monitor TV 43 are also connected. Since the video circuit 40, the processing circuit 41, the frame memory 42, and the monitor television 43 are publicly known, detailed description thereof will be omitted.

A chopper control circuit 45 is connected to the video circuit 40 via a synchronizing circuit 44. The chopper control circuit 45 controls the rotation of the motor 25. The synchronization circuit 44 and the chopper control circuit 45 constitute a synchronization control means.

Further, an integration circuit 46 is connected to the video circuit 40, and a shifter drive circuit 49 is connected to the integration circuit 46 via a comparator 47 having a hysteresis characteristic. The shifter drive circuit 49 drives and controls the shifter 36.

The operation of the electronic endoscope apparatus having the above configuration will be described. The operator holds the operation body 11 of the endoscope 10 by hand and inserts the insertion portion 12 into the body cavity of the subject. For example, insert it through the mouth into the esophagus or stomach. The light from the light bulb 21 passes through the optical fiber bundle 18 and is emitted from the illumination window 15 into the body cavity. The reflected light from the inner wall of the body cavity reaches the solid-state image sensor 16 through the observation window 14 and the convex lens 17. As a result, the image of the inner wall of the body cavity is formed on the light receiving portion 16a of the solid-state image sensor 16.

The light receiving portion 16a of the solid-state image pickup device 16 photoelectrically converts the projected image and stores the image signal as an electric charge. Then, in the solid-state imaging device 16, the charges for one field scanning are transferred from the light receiving unit 16a to the storage unit 16b in a short time by the transfer timing signal from the video circuit 40. The video circuit 40 receives the image signal Sg from the storage unit 16a of the solid-state image sensor 16, converts the image signal Sg into an NTSC TV video signal St, and sends the NTSC TV video signal St to the monitor TV 43. As a result, an image of the inner wall of the body cavity is displayed on the monitor TV 43 by the interlaced scanning method.

The operator operates the endoscope 10 while watching the monitor TV 43 to observe the inside of the body cavity. When a precise inspection is required, one frame scan of the TV video signal St is processed by the processing circuit 41.
Stored in the frame memory 42 according to the command of
The still image is displayed on the monitor TV 43 by repeatedly reading and sending it to the monitor TV 43.

The supply of illumination light is controlled as detailed below.

The chopper 30 is driven by the motor 25 to rotate once every frame scanning time to cross the luminous flux A of the illumination light to supply the illumination light pulse. The supply time of the illumination light pulse is controlled in two steps by changing the positional relationship of the chopper 30 with respect to the light flux A by the shifter 36.
First, the illumination light supply in the first stage will be described. In FIG. 1, when the solenoid of the shifter 36 is excited,
Since the rod 36a retracts, the motor 25 and the chopper 30 move leftward in FIG. As a result, the chopper 30 has the positional relationship shown in FIG. In this state, the light flux A is located on the rotation loci of the first window 31a and the first shield portion 31b of the chopper 30, and when the first shield portion 31b shields the light flux A, the illumination light is emitted from the illumination window 15. The illumination light is supplied only when the first window 31a is at the position of the light flux A without being supplied into the body cavity. As a result,
The illumination light pulse will be supplied intermittently. First window
Since 31a has a narrow angle of 90 °, the supply time of the illumination light pulse becomes short as shown in FIG.

Next, the illumination light supply in the second stage will be described. When the solenoid of the shifter 36 is non-excited, the rod 36a projects, so that the motor 25 and the chopper 30 are moving to the right in FIG. 1, and as a result, the chopper 30 is moved relative to the light flux A in FIG. The positional relationship shown in (b) is obtained. In this state, the light flux A is located on the rotation loci of the second window 32a of the chopper 30 and the second shield portion 32b, and the second shield portion 32b emits the light flux A.
The illumination light is not supplied from the illumination window 15 to the inside of the body cavity when the light is blocked, and the illumination light is supplied only when the second window 32a is at the position of the light flux A. As a result, the illumination light pulse is supplied intermittently. The angle of the second window 32a is 1
Since it is as wide as 80 °, the supply time of the illumination light pulse is relatively long as shown in FIG.

As will be described later, the supply time of the illumination light pulse is divided in half at the time point when the image signal to be subjected to odd field scanning is transferred to the storage section 16b.

When the illumination light pulse is supplied at the above timing, the light receiving portion 16a of the solid-state image sensor 16 stores a charge (that is, an image signal) because it becomes a dark field when the illumination light pulse is not supplied in each field scanning period. The electric charge corresponding to the amount of received light is stored for only a half of the supply time of the illumination light pulse. Further, the accumulation period of the image signal to be used for the odd field scanning and the subsequent accumulation period of the image signal to be used for the even field scanning are continuous. As a result, the one-frame scanning still image displayed on the monitor TV 43 is formed by superimposing the odd-even field scanning images accumulated in each half of the illumination light pulse supply time.

Therefore, the still image is based on the image information accumulated during the supply time of the illumination pulse, and has less blurring and is clearer than the conventional image based on the image information accumulated during one frame scanning period. Can be

The supply time of the illumination light supply pulse is adjusted by the brightness of the image, which changes depending on the observation site by the endoscope and the usage state. In the following discussion, the brightness level (voltage level) has a relationship of Lm ₁ <Lm ₂ . The video signal of the video circuit 40 is integrated by the integration circuit 46 for one frame scan, for example, and the brightness of the video is detected. The brightness signal Sm from the integrating circuit 46 is sent to the comparator 47. The level (voltage level) of the brightness signal Sm rises and the brightness level Lm ₁
Is exceeded, the comparator 47 moves the shifter drive circuit 49.
A drive signal (a signal of logical level "1") is output to the shifter drive circuit 49, which supplies power to the solenoid of the shifter 36 and excites it. As a result, the chopper 30 changes from the position shown in FIG. 3 (b) to the position shown in FIG. 3 (a). As a result, the supply time of the illumination light pulse is shortened.

Immediately after this, the level of the brightness signal Sm sent from the integrating circuit 46 to the comparator 47 also drops and becomes lower than the brightness level Lm _1. However, since the comparator 47 has a hysteresis characteristic, it returns to the shifter drive circuit 49. No signal (logic level "0" signal) is sent immediately.

The positional relationship shown in FIG. 3A, that is, the transition to the illumination light supply in the first stage is executed, for example, when the endoscope 10 observes the esophagus. The wall of the esophagus has a light color tone, and since it is closely observed, the lighting efficiency is high. That is, the observation window 1 is reflected by the illumination light emitted from the illumination window 15.
This is because the light level of the video signal increases because the ratio of the amount of light entering from 4 is high. In the esophagus, since the movement of the heart is intense due to the effect of the heartbeat, it is preferable to shorten the supply time of the illumination light pulse, but the above adjustment satisfies this requirement.

Then, when the brightness signal Sm decreases and becomes lower than the brightness level Lm ₂ during the execution of the above-described first-stage illumination light supply, a return signal (logic level "0" is output from the comparator 47 to the shifter drive circuit 49. Signal) is transmitted. As a result, the solenoid of the shifter 36 is in the non-excited state, and the third
The positional relationship shown in FIG. 2B is changed, and the supply time of the illumination light pulse becomes longer.

The positional relationship shown in FIG. 3B, that is, the transition to the illumination light supply in the second stage is realized, for example, when the endoscope 10 observes the stomach. The stomach has a large volume and tends to be viewed from a distance, and the illumination efficiency is poor. In other words, the proportion of the amount of light reflected from the illumination window 15 and incident on the observation window 14 is low. This is because the brightness level of the signal decreases. In the stomach, since the movement is relatively slow, it is possible to slightly increase the illumination light pulse supply time. Figure 3 above
When the state shifts to the state of (b), the amount of illumination light used for one-field scanning increases, so that the brightness of the image displayed on the monitor television 43 becomes appropriate.

As described above, the supply time of the illumination light pulse can be adjusted according to the usage mode and the observation location, the blurring of the still image can be surely prevented, and the brightness signal Sm becomes Lm ₁ >Sm> Lm _2. The brightness of the image can be controlled to be appropriate. When the lighting efficiency is extremely high or low, the brightness signal Sm may deviate from the above range,
In a normal usage mode, the brightness signal Sm can be set to a level in the above range or in the vicinity thereof.

The timing of supplying the illumination light pulse in the first step and the second step is controlled as follows. That is, the synchronization circuit 44 detects a frame synchronization signal that occurs once per frame scanning time, for example, a vertical synchronization signal that occurs before the odd-numbered field scanning is started, in the television video signal St from the video circuit 40. To do. On the other hand, the position sensor 35 detects the magnet 33 or 34 of the rotating chopper 30, and detects the detected position signal Spo.
To the synchronizing circuit 44. In addition, at the time of supplying the illumination light in the first stage, the position sensor 35 is arranged on the rotation locus of the magnet 34 on the outer side so that the position of the magnet 34 can be detected, and at the time of supplying the illumination light in the second stage. The position sensor 35 is arranged on the rotation locus of the magnet 33 on the inside so that the position of the magnet 33 can be detected. The synchronizing circuit 44 detects the phase difference between the frame synchronizing signal and the detected position signal Spo from the position sensor 35, compares the detected phase difference with the set phase difference, and outputs the phase difference deviation signal Sre.
To the chopper control circuit 45. The chopper control circuit 45 detects the rotational speed of the chopper 30 from the frequency of the detected position signal Spo from the sensor 35, controls the motor 25 based on the detected speed and the phase difference deviation, and determines the rotational speed of the chopper 30. Control.

As a result, the time when the central portions of the windows 31a and 32a of the chopper 30 pass through the central portion of the light flux A is made coincident with the time of transferring the image signal to be subjected to the odd field scanning. In other words,
The supply time of the illumination light pulse is divided in half at this transfer point.

The present invention is not limited to the above-mentioned embodiment and various modes are possible. For example, in the above-described embodiment, the supply time of the illumination light pulse is adjusted in two steps, but the rotation trajectory of the chopper 30 is further removed from the light beam A to continuously supply the illumination light, and the adjustment in three steps is performed. Good.

The illumination light supply device 20 'shown in FIGS. 5 to 7 has two choppers 30A and 30B whose rotation axes are coaxial or parallel.
have. The members corresponding to those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Each chopper 3
The windows 31a and 32a and the shields 31b and 32b having the same angle range as described above are formed in the peripheral portions of the 0A and 30B, respectively. In this embodiment, each chopper 30A, 3
0B is rotated by independent motors 25A and 25B. The motors 25A and 25B are controlled by chopper control circuits 45A and 45B, respectively. The magnets 33, 34 provided at specific positions of the shielding portions 31b, 32b of the choppers 30A, 30B are connected to the position sensors 35A,
35B respectively, and in the synchronizing circuit 44, based on the position detection signal Spo from the position sensors 35A and 35B and the frame synchronizing signal, the choppers 30A and 30B.
The position deviation signal Sre for each chopper control circuit 45A, 45
Send to B. The operation of the chopper control circuits 45A and 45B is similar to that of the above embodiment. Choppers 30A and 30B
Is adjusted in two stages by each shifter 36, 37. Each of the shifters 36 and 37 includes a shifter drive circuit 4
9A and 49B respectively drive.

When the level of the brightness signal Sm exceeds Lm ₁ , a "1" level signal is output from the comparator 47 to the shifter drive circuits 49A and 49B to excite the solenoids of both shifters 36A and 36B, and FIG. ) As shown in chopper 3
The light beam A on the rotation locus of the 0 A first window 31a and the first shielding portion 31b
Is provided, which provides the first stage illumination light supply.
When the level of the brightness signal Sm becomes lower than Lm _2, a signal of "0" level is output from the comparator 47, the solenoids of both shifters 36A and 36B are de-energized, and the seventh
As shown in FIG. 2B, the second window 32a of the chopper 30B and the second window 32a
The light flux A is located on the rotation locus of the shielding portion 32b, so that the illumination light is supplied in the second stage.

Also in this embodiment, the rotation loci of both choppers 30A and 30B may be deviated from the light flux A to continuously supply the illumination light, and three-stage adjustment may be performed.

Further, in the present invention, only one chopper having only one window may be used and the chopper may be moved in two steps. In this case, in the first stage, the window and the shielding portion alternately cross the light flux of the illumination light to obtain the illumination light pulse, but in the second stage, the light flux deviates from the rotation trajectory of the chopper, and the illumination light is continuously emitted. Supplied.

As a moving mechanism of the chopper, a moving motor may be used instead of the shifter having the solenoid as in the above embodiment. For example, a motor for rotating the chopper is supported on a moving table, and the moving table is connected to the moving motor via a rack and a pinion. In this case, the chopper can be moved steplessly.

When the chopper is moved steplessly, a window whose both edges are curved is formed so that the angle gradually increases in the radial direction of the chopper.

As shown in the first embodiment, when a plurality of windows are formed in the chopper along the radial direction, magnets are attached at two positions to enable the position sensor to detect the position at each stage.
The magnet may be provided at one location, and the position sensor may follow the movement of the chopper so that the magnet is always positioned on the rotation locus of the magnet. The position sensor is not limited to the proximity switch, but may be a photoelectric switch or the like.

In the above two embodiments, the brightness of the image is detected, and the chopper is automatically moved based on this brightness signal, but the switch may be manually operated to move the chopper.

There may be a plurality of windows of the chopper at equal angular intervals in the same diameter region. In this case, when the chopper makes one rotation, frame scanning is performed by the number of windows.

The light incident from the observation window is received by one end surface of the optical fiber bundle,
This optical fiber bundle may be guided to the outside of the operation body in the same manner as the optical fiber bundle for illumination, and the solid-state image sensor may be arranged on the other end face.

Further, using a conventional endoscope having an eyepiece, the light incident from the observation window is sent to the eyepiece through the lens and the optical fiber bundle, and a television camera for a monitor TV is attached to the eyepiece. The television camera may be connected and the image from the endoscope may be received by the solid-state imaging device of the television camera.

You may record a still image on a monitor TV on an optical disc or shoot it with a hooded camera. Alternatively, one frame scanning portion of the moving image displayed on the monitor TV may be photographed by the hooded camera without using the frame memory.

The electronic endoscope apparatus of the present invention can be applied to industrial inspection.

(Effect of the Invention) As described above, according to the present invention, the chopper having the window is rotated by the motor so that the luminous flux of the illumination light is crossed so that the illumination light pulse can be supplied for each frame scanning. Moreover, the synchronization control means equalizes the accumulation period of the image signal to be subjected to the odd-numbered and even-numbered field scanning and the accumulation period of the image signal to be subjected to the other field scanning thereafter, In addition, since the images can be made continuous, even for an object to be photographed with a lot of movement, the image for one frame scanning can be made a clear image without flicker. Further, by moving the chopper in the direction intersecting the luminous flux of the illumination light, the supply time of the illumination light can be adjusted, and appropriate illumination can be performed according to the observation location and the usage mode.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention,
FIG. 1 is a perspective view showing an endoscope and an illumination light supply device in an electronic endoscope device, FIG. 2 is an electric circuit diagram of the electronic endoscope device, and FIGS. 3 (a) and 3 (b) are stages. FIG. 4 is a front view showing the positional relationship between the chopper and the luminous flux of the illumination light when the illumination light is supplied, and FIG. 4 is a time chart diagram. 5 to 7 show another embodiment of the present invention, FIG. 5 is a perspective view of an illumination light supply device, FIG. 6 is an electric circuit diagram, and FIGS. 7 (a) and 7 (b). FIG. 4 is a front view showing the positional relationship between the chopper and the luminous flux of illumination light at each stage. 10 ... Endoscope, 11 ... Operation main body, 12 ... Insertion part, 16 ...
Solid-state imaging device, 16a ... Light receiving part, 16b ... Storage part, 18 ... Optical fiber bundle (illumination light transmission optical system), 20, 20 '... Illumination light supply device, 21 ... Light bulb (light source), 25, 25A, 25B ...
Motor, 30, 30A, 30B ... Chopper, 31a, 32a ...
Window, 31b, 32b ... Shielding part, 36, 36A, 36B ... Shifter (moving mechanism), 40 ... Video circuit, 43 ... Monitor TV, 44 ... Synchronous circuit (synchronous control means), 45 ... Chopper control means (synchronous control means) )

Claims (1)

[Claims] Claim: What is claimed is: 1. An image input from an observation window of an endoscope is received by a solid-state image sensor, and an image signal from the solid-state image sensor is converted into a television video signal of an interlace scanning system by a video circuit. In an illumination light supply device used for an electronic endoscope device which displays an image on a monitor television based on (a), (b) is arranged between an end of an illumination light transmission optical system of the endoscope and a light source. A chopper, (b) a motor for rotating the chopper, and (c) at least one window formed in the chopper and intermittently supplying an illumination light pulse to the illumination light transmission optical system by intersecting the luminous flux of the illumination light. (D) A moving mechanism that moves the chopper in a direction that intersects the luminous flux of the illumination light, and (e) a solid-state image sensor that provides an image signal to be subjected to either the odd-numbered or even-numbered field scanning. An electronic endoscope, comprising: a synchronous control means for controlling the rotation of the motor so that the center of the supply time of the illumination light pulse coincides with the time when the light is transferred from the light receiving part to the storage part. An illumination light supply device used in the device.