JPH0943519A - Endoscope image pickup unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact endoscope image pickup unit by which an optimum focusing is obtained and a good picture is obtained by approximately focusing the unit once and operating the automatic iris diaphragm provided in the unit. SOLUTION: This unit is provided with an endoscope 1 which relays an object image through an observation optical system and a TV camera which is freely attachable and detachable to the endoscope 1. The camera is provided with an image forming lens system 6 which reform the last image relayed from the endoscope 1, a diaphragm means 18 whose opening size is variable and a CCD(an imaging element) 21. At least one of the lenses constituting the system 6 and the means 18 are in a fixed relation in their relative position with respect to an optical axis direction. The focusing is conducted by varying the interval between at least one of the lenses and the CCD 21 in the optical axis direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an endoscopic image pickup device in which a camera is attached so that the TV camera can observe an endoscopic image.

[0002]

2. Description of the Related Art Generally, a detachable external TV camera is used behind an eyepiece to guide an image of a body cavity or the like obtained by an endoscope to an image pickup apparatus. FIG. 6 shows the configuration of an endoscope apparatus using this external TV camera. In the figure, 1 is an endoscope (here, a rigid endoscope), 5 is a TV photographing adapter, 7 is a TV camera head, 8 is a display TV monitor, and 9 is a CCU (camera control unit). The endoscope 1 includes an insertion portion including an objective lens 2 and a relay lens 3, and an eyepiece portion including an eyepiece lens 4. The objective lens 2 forms an object image Q, and this image Q is transmitted by the relay lens 3 up to the front of the eyepiece 4 (image Q ′). The light forming the image Q ′ exits from the eyepiece lens 4 as a substantially parallel light beam. Therefore, the object image can be observed through the eyepiece lens 4. The relay lens 3 is usually composed of a plurality (generally an odd number) of lenses.

The TV photographing adapter 5 is attachable to and detachable from the eyepiece of the endoscope, and internally includes a diaphragm (auto iris) 11 having a variable aperture size and an imaging lens system 6. The diaphragm 11 is provided at a position where the diaphragm 11 substantially coincides with the exit pupil of the eyepiece lens 4 when the TV photographing adapter 5 is attached to the eyepiece of the endoscope, and the size of the aperture is TV. It is changed by the driving force of a motor provided in the photographing adapter 5. The imaging lens system 6 receives light emitted from the eyepiece lens 4 and forms an object image on an image pickup device such as a CCD image sensor when the TV camera head 7 is attached to the TV photographing adapter 5. To converge the luminous flux. The TV camera head 7 includes a filter group 10 and a solid-state image sensor CCD. The output signal from the image sensor is supplied to the CCU 9. The CCU 9 converts this signal into a signal that can be displayed on the display TV monitor 8, and
It performs various necessary signal processing. In addition, it also outputs a signal for controlling the camera or the like as necessary. Reference numeral 12 is an electric drive system path to which a signal for controlling the diaphragm 11 is sent.

The contact 13 is a connecting portion of the signal line 12 for controlling the diaphragm, and is provided so that the contact 13 is connected when the TV camera head 7 and the TV photographing adapter 5 are attached. As described above, in the conventional device, the TV photographing adapter 5 having the imaging lens system 6 is attached to the rear of the eyepiece lens 4 such as an endoscope, and the CC in the TV camera head 7 is attached.
An image is formed on an image pickup device such as D, and the image can be observed by the display TV monitor 8. Incidentally, TV
The outer diameter of the camera head 7 is about 2 to 3 cm, and the length when the TV shooting adapter 5 and the TV camera head 7 are connected is about several cm.

However, there is a problem that the depth of field is shallow when observing an image from the endoscope as described above on a monitor. In recent years, CC, which is an image sensor of TV cameras
The pixel D tends to have a higher number of pixels, which enables a higher resolution of the subject. However, due to this, the size of one pixel (pixel pitch) becomes small, and therefore the permissible circle of confusion diameter of the imaging lens must also be made small, and the depth of field becomes even shallower. Therefore, since the endoscope optical system such as the rigid endoscope optical system has a shallow depth of field, when the operation is performed by operating the endoscope, the imaging lens system 6 is moved forward and backward with respect to the optical axis. It becomes necessary to move it and focus frequently.
Not preferred. For this reason, recently, in order to improve the depth of field, a variable diaphragm 11 is provided near the pupil position transmitted by the relay system of the endoscope so that the diaphragm 11 can be observed at a long distance.
When observing a bright object using, and observing a close object, there is a margin in brightness, so the diaphragm 11 is narrowed to improve the depth of field for observation.

FIG. 7 (a) shows the structure of an endoscope image pickup device having such a device. This endoscope image pickup device is different from that shown in FIG. 6 in that a TV photographing adapter and a TV camera head are integrated. With this device, the frequency of focusing is reduced for the time being, but the effort of focusing is not completely eliminated. As shown in FIG. 7A, in an endoscope imaging apparatus, an iris unit 19 including an auto iris (variable diaphragm) 18 is usually used in order to reduce the size in the radial direction.
It is formed in a tubular shape extending in the optical axis direction. Further, the lens barrel 1 holding the imaging lens system 6 in the iris unit 19
5 are accommodated. The lens barrel 15 is provided with a focus adjustment knob 20. By operating the focus adjustment knob 20 from outside the outer frame 7a of the TV camera head 7, the imaging lens system 6 is moved in the optical axis direction. You can do it. It should be noted that FIG. 6B is a view showing the state of the focus adjustment knob 20 as seen from the side surface of the TV camera head 7.

The endoscopic image captured by the endoscope 1 is
After passing through the heat-resistant cover glass 22 provided behind the endoscope 1 and the heat-resistant cover glass 14 provided in front of the TV camera head 7,
An image is formed on the CCD 21 by the image forming lens system 6. In addition, just before the CCD 21 in the optical path,
A filter group 10 such as a low-pass filter and an infrared light cut filter is arranged. Focusing of the imaging lens system 6 in such an endoscope image pickup apparatus is performed by operating the focus adjustment knob 20 provided on the lens barrel 15 in the direction of the arrow in the drawing to move the imaging lens system 6 to the CCD 21. It is performed by moving in the optical axis direction.

[0008]

However, in such a conventional device, the lens barrel 15 and the focus adjustment knob 20 are not provided.
Therefore, the number of parts is increased and the frame member supporting the imaging lens system 6 has at least a triple structure, which causes decentering of the imaging system. Further, since the imaging lens system 6 is moved in the optical axis direction while the auto iris 18 is fixed, the height of the light ray passing through the imaging lens system 6 is largely changed by focusing, and the periphery of the imaging lens system 6 is changed. Aberration is likely to be deteriorated.
Further, considering the compactness of the TV camera head 7 externally attached to the endoscope 1, the outer diameter of the imaging lens system 6 must be reduced by the thickness of the lens barrel 15 in the iris unit 19. . Therefore, the effective light flux around the imaging lens system 6 is likely to be vignetted, the peripheral light amount is reduced, and the lens barrel 15 is reduced.
Ghost flares are likely to occur due to light rays hitting the. On the contrary, if the outer diameter of the iris unit 19 is increased in consideration of the vignetting of the light flux, the device cannot be made compact and the size in the outer diameter direction must be minimized. Will be contrary to.

In view of the above-mentioned problems of the prior art, the present invention provides optimum focusing only by operating the auto iris provided in the apparatus once the endoscope is roughly focused. At the same time, it is an object of the present invention to provide an endoscope imaging apparatus that is compact and that can obtain good images.

[0010]

In order to solve the above-mentioned object, an endoscope image pickup apparatus according to the present invention includes an endoscope for relaying an object image through an observation optical system, and an endoscope for the endoscope. In the endoscope imaging device including a detachable TV camera, the TV camera has an imaging lens system for re-imaging the final image relayed by the endoscope, and the size of the opening is variable. And an image sensor, and at least one lens of the lenses forming the imaging lens system and the diaphragm unit are fixed in relative position with respect to the optical axis direction. In a relationship, said at least 1
It is characterized in that focusing is performed by changing a distance between the lens and the image pickup device in the optical axis direction.

Further, in the endoscope image pickup apparatus of the present invention, by moving the image pickup element along the optical axis, at least one lens among the lenses forming the image forming lens system and the image pickup element. It is characterized in that the distance between and in the optical axis direction is changed. Furthermore, by moving the diaphragm means and at least one lens of the lenses forming the imaging lens system along the optical axis, the distance between the at least one lens and the image sensor is increased. Another feature is that it is changed.

Therefore, in the endoscope image pickup apparatus of the present invention, once the endoscope is roughly focused, it is possible to perform optimum focusing simply by operating the auto iris provided in the apparatus. is there. Further, since the number of frame members that support the imaging lens system can be reduced to the required minimum number, the device can be made compact in the outer diameter direction, and there is no fear of vignetting of the light flux and occurrence of ghost flare. A good observation image can be obtained. Furthermore, if the device has autoclave resistance, it can be used for medical purposes.

[0013]

The present invention will be described in detail below with reference to the illustrated embodiments. The same members as those constituting the above-described conventional device are designated by the same reference numerals.

First Embodiment FIG. 1 is a sectional view taken along the optical axis showing the configuration of an endoscope imaging apparatus according to this embodiment. The endoscope imaging apparatus of this embodiment is used by connecting the TV camera head 7 to the eyepiece of the endoscope 1. Since the image pickup apparatus constituting the TV camera head 7 and the subsequent ones are the same as those in the conventional example, they are omitted here. The TV camera head 7 includes an imaging lens system 6, an iris unit 19 that holds the imaging lens system 6 and has an auto iris 18, a CCD 21, a filter group 10 arranged immediately before the CCD 21, and a filter group. 10 and CCD2
1 and a focus adjustment knob 20 provided on the frame member 23. The auto iris 18 is composed of an aperture blade portion for changing the size of the aperture and a drive device (not shown) for driving the aperture blade portion. Further, a cover glass 14 having heat resistance is provided on the front surface of the TV camera head 7 (connection surface with the endoscope 1). Focusing in this imaging device is performed by operating the focus adjustment knob 20 and moving the CCD 21 with respect to the imaging lens system 6 along the optical axis direction.

In the apparatus of this embodiment, since the image forming lens system 6 is held by the iris unit 19 having the auto iris 18, the relative position between the auto iris 18 and the image forming lens system 6 is always kept constant. And then
The relative position of the imaging lens system 6 remains unchanged during focusing. Therefore, before and after focusing, the height of the light beam passing through the imaging lens system 6 does not change and is constant, so that it is not necessary to consider the balance of the aberration variation of the imaging lens system 6 during focusing, and a good image is always obtained. Is obtained. Further, since the image forming lens system 6 is held by the double frame structure of the outer frame 7a of the TV camera head 7 and the iris unit 19, the decentering of the image forming lens system 6 is less likely to cause play. Further, since the outer diameter of each lens forming the imaging lens system 6 can be set to the maximum outer diameter allowed by the TV camera, a change in the peripheral light amount of the lens,
It is possible to reduce the amount of light rays that strike the lens frame (iris unit 19) that causes ghost flare.

In the apparatus of this embodiment, as shown in FIG. 2, the CCD 21 and the filter group 10 are fixed in the TV camera head 7 of the apparatus, the iris unit 19 is provided with the focus adjustment knob 20, and the focus adjustment is performed. Operate the knob 20 to CC the imaging lens system 6 together with the iris unit 18.
Focusing may be performed by moving the lens element D21 along the optical axis direction. Even when the device is configured as described above, the same effect as that of the device shown in FIG. 1 can be obtained.

Further, in the image forming optical system 6, in order to minimize the reduction of the peripheral light amount and suppress the backlash caused by the fluctuation of aberration and decentering due to focusing, the position of the auto iris 18 and the position of the exit pupil of the endoscope 1 are controlled. You should match with. Therefore, the auto iris 18 is the imaging lens system 6
It is preferably arranged in front of. 1 and 2
As shown in FIG. 5, in the apparatus of this embodiment, the final image Q ′ of the relay system of the endoscope 1, the objective lens 4, the auto iris 1
It is best to arrange each of them in the order of 8, the imaging lens system 6, and the CCD 21.

Now, the purpose of focusing in the endoscope apparatus is to correct the variation in the focus of each endoscope. Therefore, like the endoscope imaging apparatus of the present embodiment,
In the case of a device that also has a focusing function in addition to the auto iris, the size of the opening of the auto iris is adjusted at any time depending on the brightness of the endoscopic image obtained during use of the device, but the frequency of focusing is extremely high. Less. Basically, once the focus position is determined for one endoscope, new focusing becomes unnecessary thereafter. Therefore, like the device shown in FIGS. 1 and 2,
Having a focus adjustment knob that can freely change the focus position in an analog manner makes usability worse.

In an endoscope, particularly a rigid endoscope, a large number of lenses are arranged from an objective lens to an eyepiece lens. However, due to manufacturing errors and assembling errors of each lens, the eyepiece is in focus. The position of the intended object may be slightly displaced. FIG. 3 is a diagram for explaining this state, and FIG. 3A shows a state in which the subject is accurately focused,
(B) shows a state where the subject is out of focus. In the state shown in FIG. 7A, the light from the point P is transmitted by the objective lens and the relay lens of the rigid endoscope, and is emitted as a parallel light beam from the eyepiece (diopter 0 m ^-1 (diopter)).
On the other hand, in the state shown in FIG.
The light from is transmitted through the objective lens and the relay lens of the rigid endoscope, and is emitted as a parallel light flux from the eyepiece lens. When the TV camera head attached to the eyepiece of the rigid endoscope forms an image of this parallel light flux on the CCD, FIG.
The image of the object located at the point P in the rigid endoscope 1 shown in (a) and the image at the point P'in the rigid endoscope 1'shown in FIG. That is, the position of the object that is most clearly imaged differs for each rigid endoscope. This is the variation in focus for each product. Correcting this and adjusting so that the image of the object at the position of the point P is formed most clearly (moving the position of the CCD) on any rigid endoscope corrects the focus variation described here. Focusing for.

The difference between focusing of a general camera and the like and focusing of an endoscope is as follows. Focusing generally referred to is to follow an object position when it changes. However, the depth of field of the endoscope is very deep, and for example, in the case of the rigid endoscope 1 shown in FIG. 3A, the range of the arrow including the point P can be captured very clearly. Therefore, the focusing function is unnecessary for the rigid endoscope 1 configured in a preferable state. A rigid scope, like a camera,
This is not for shooting a single object from a very distant object to a very close object, but for observing only fixed objects such as human internal organs and machines. For this reason, all the objects to be observed exist within the depth of field, and the focus adjustment that is performed by a general camera is unnecessary.

The depth of field changes with the size of the aperture of the diaphragm, and the smaller the diaphragm, the larger the depth of field. If the depth of field becomes extremely wide, there will be no problem with the above-mentioned misalignment of points P and P '. However, in reality, if the aperture is made too small, the obtained image becomes dark, so there is a limit to the expansion of the depth of field. The optimum depth of field in the state shown in FIG. 3A is not clear when the state shown in FIG. To correct this, both the action of expanding the depth of field by reducing the aperture and the action of changing the image receiving position by moving the CCD in the optical axis direction can be used, and therefore CC
The movement of D can be made to some extent. Therefore, it suffices to provide a mechanism for adjusting the distance of discontinuous scattering so that it is in focus, and rather this is more convenient.

Further, the variation in the focus of the rigid endoscope is ±
If it is within the range of 0.5 m ^-1 , it can be sufficiently dealt with by using an auto iris, and focusing can be made unnecessary in any rigid endoscope. If this range is exceeded, focusing becomes necessary. That is,
For example, in the apparatus shown in FIG. 2, assuming that the focal length of the imaging lens system 6 is f, the imaging lens system 6 per 1 m ⁻¹
Focusing movement amount of a f ^2/1000, it is best to provide a focus adjustment mechanism of the step type for each the f ^2/1000. Further, since the variation between the rigid endoscopes is ± 1 m ^-1 at the maximum, if the focus adjusting mechanism provided in the TV camera head is configured as a dial type as shown in FIG. 4A, it is very convenient. Will be things.

In the vicinity of the dial 25 shown in FIG. 4 (a), an index 26a, 1m ^-1 for the dial 25,
26b and 26c are engraved. This index 26a-26
If c is engraved at a position of at least ± 1 m ^{−1 with} respect to the focus position in the standard state, it is possible to sufficiently cope with the focus variation of the rigid endoscope. Further, in this case, it is preferable that at least 3 or more indexes are provided. The dial-type focus adjusting mechanism is provided on the side surface of the TV camera head 7, as shown in FIG. By rotating this dial 25, as shown in FIG.
In the case of the apparatus shown in FIG. 2, the CCD 21 can be moved, and in the case of the apparatus shown in FIG. 2, the imaging lens system 6 can be moved along the optical axis.

In a TV camera head provided with such a dial type focus adjusting mechanism, the dial is adjusted to one of the positions of the indexes only once when the endoscope is attached, and the approximate focus position is obtained. If you decide
After that, the focusing can be adjusted only by operating the auto iris provided in the apparatus, so that the focusing as described above becomes unnecessary. Since the focus may shift during use of the rigid endoscope, it is more effective to provide the dial with a click mechanism or fix the dial with a fixing screw after focusing.

Second Embodiment In the case of the medical endoscope, it is indispensable to surely sterilize the used endoscope in order to prevent infectious diseases. In the past, this sterilization treatment was carried out with a gas such as EOG (ethylene oxide gas) or a cleaning liquid, but as is well known, sterilizing gases are extremely toxic and are required to ensure safety during sterilization work. The work becomes complicated. Further, there is a problem that the disposal of the cleaning liquid requires a great deal of cost.
Therefore, in recent years, heat sterilization (autoclave, etc.) that does not involve such complicated work is becoming the mainstream in the sterilization work of endoscope devices.

However, for example, an external TV for an endoscope, which is detachably attached to the eyepiece of the endoscope to pick up an endoscopic image.
In a camera, the watertightness during normal use is sufficient, but it is difficult to completely seal the inside under the high temperature and high pressure condition in the above autoclave treatment, so vapor etc. enter the inside, and therefore the internal lens There is a possibility that the system may become cloudy and that electronic components inside the TV camera may be deteriorated and corroded. Also, in the case of a device that performs autoclave treatment, as is conventionally done,
It is impossible to provide a knob on the outside of the TV camera head and manually move the imaging lens system.

Therefore, in the endoscope imaging apparatus of this embodiment,
The device has an auto iris for optimal focusing and sterilization.

That is, the apparatus of this embodiment is detachable from the eyepiece of the endoscope, and internally has a lens member for changing the degree of convergence or divergence of the light beam emitted from the eyepiece. A TV photographing adapter including the above and a camera having a watertight structure which is detachable from the adapter and includes an image sensor inside are provided, and the camera is attached to the eyepiece of the endoscope through the adapter. In this state, focusing is performed by changing the distance between the adapter and the camera. In the apparatus of this embodiment, instead of the adapter, a plurality of adapters having lens members having different focal lengths can be used, and the lens member incorporated in the adder may be composed of a single lens. It is possible. Further, the adapter is provided with a diaphragm (auto iris) whose opening size is variable.

The present embodiment will be specifically described below. FIG.
FIG. 3 is a cross-sectional view taken along the optical axis showing the configuration of the endoscope imaging apparatus according to the present embodiment, in which the endoscope (hard endoscope) 1 is attached to a TV photographing adapter 5 and a TV camera head 7 having autoclave resistance. Shows the closed state. The endoscope 1 is the same as the conventional one. The apparatus according to the present embodiment has the final image Q ′ transmitted by the image transmission system of the endoscope 1.
However, after passing through the eyepiece 4 and the cover glass 22, an image is formed on the CCD 21 via the image forming lens system 6 supported by the iris unit 19 having the auto iris 18. The portion where the TV photographing adapter 5 and the eyepiece portion of the endoscope 1 are mounted is configured so that both of them can relatively rotate about the optical axis. Also, TV
Screw portions 29 and 30 are formed at the connecting portion between the photographing adapter 5 and the TV camera head 7, respectively. Therefore,
When the TV shooting adapter 5 is rotated about the optical axis, the TV camera head 7 moves back and forth with respect to the optical axis direction. As a result, the distance between the TV shooting adapter 5 and the TV camera head 7 changes, and focusing can be performed.

Since both the TV photographing adapter 5 and the TV camera head 7 are required to have watertightness at a level that makes them resistant to autoclave, the image forming lens system 6, the filters 10 and the CCD 21 have cover glasses 14 and 22 having autoclave resistance. It is completely partitioned by. Further, in order to provide heat resistance to the autoclave, it is preferable that the cover glass 14 is formed of a crystal glass such as sapphire, quartz, quartz or the like, instead of an ordinary optical member. In this way, the external TV camera attached to the endoscope 1 can have auto iris and autoclave resistance. Of course, a method of disposing of the TV photographing adapter 5 and the TV camera head 7 (disposable) can be considered. In this case, the cover glass 14 becomes unnecessary.

Further, in the TV photographing adapter 5, instead of the cover glass 14, crystal glass having autoclave resistance may be provided before and after the iris unit 19 so that the imaging lens system 6 can be sealed. By providing such a crystal glass, it is possible to suppress the occurrence of chromatic aberration to some extent.

As described above, the endoscope imaging apparatus according to the present invention has the following features in addition to the features described in claims 1 to 3.

(1) In the observation optics of the endoscope, an objective lens that forms an object image and a relay lens system that re-images the object image formed by the objective lens and relays it to a predetermined position. The endoscope imaging apparatus according to claim 1, wherein the endoscope imaging apparatus includes:

(2) The diaphragm means includes diaphragm blades for changing the size of the aperture and a mechanism for driving the diaphragm blades, and the portions other than the diaphragm blades are formed in a cylindrical shape. The lens forming the imaging lens system is supported in the cylinder.
The endoscopic imaging device according to 1.

[0035] (3) the image pickup device, or the throttle means and the lens, to claim 2 or 3 along the optical axis, characterized in that so as to move stepwise by f ^2/1000 of the described Imaging device. However, f is the focal length of the lens.

(4) A watertight TV photographing adapter having the diaphragm means and a lens built-in, and a watertight structure TV camera head having the image pickup element built-in. The adapter and the TV camera head are optical axes. The endoscopic imaging device according to claim 1, wherein the endoscopic imaging device can be coupled so as to be movable relative to each other.

[0037]

As described above, in the endoscope imaging apparatus according to the present invention, once the endoscope is roughly focused, the optimum focusing can be performed only by operating the auto iris provided in the apparatus. It is possible to do.
Further, since the number of frame members for supporting the imaging lens system can be reduced to the necessary minimum number, the apparatus can be made compact in the outer diameter direction, and there is no fear of vignetting of the light flux and occurrence of ghost flare. A good observation image can be obtained. Furthermore, since the device of the present invention has autoclave resistance, it is optimal for medical use.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along the optical axis of an endoscope imaging apparatus according to a first example.

FIG. 2 is a diagram showing a modified example of the endoscope imaging apparatus of the first embodiment.

3A and 3B are diagrams for explaining a shift of a focus position that occurs for each endoscope, FIG. 3A shows a state where the focus is accurately focused, and FIG. 3B shows a state where the focus position is shifted. It is a figure.

4A and 4B are diagrams for explaining a dial type focus adjustment mechanism provided in the endoscope imaging apparatus of the first embodiment.

FIG. 5 is a sectional view taken along the optical axis showing the configuration of the endoscope imaging apparatus of the second embodiment.

FIG. 6 is a diagram showing a configuration of an endoscope apparatus using a conventional external TV camera.

7A is a sectional view taken along the optical axis showing the configuration of a conventional endoscope imaging apparatus, and FIG. 7B is a view showing a focus adjustment knob provided in the apparatus shown in FIG. 7A. .

[Explanation of symbols]

 1 Endoscope (hard endoscope) 2 Objective lens 3 Relay lens 4 Eyepiece 5 TV shooting adapter 6 Imaging lens system 7 TV camera head 8 TV monitor 9 CCU (camera control unit) 10 Filter group 11 Aperture 12 Electric drive system Road 13 Contact 14, 22 Cover glass 15 Lens barrel 18 Auto iris (variable diaphragm) 19 Iris unit 20 Focus adjustment knob 21 CCD (imaging device) 25 Dial 26a-26c Index 29, 30 Screw part

Claims (3)

[Claims] 1. An endoscope image pickup apparatus comprising an endoscope that relays an object image through an observation optical system and a TV camera that is attachable to and detachable from the endoscope, wherein the TV camera is the internal camera. An imaging lens system for re-imaging the final image relayed by the endoscope, a diaphragm unit having a variable aperture size, and an image sensor are provided, and the imaging lens system is configured. At least one of the lenses and the diaphragm means have a fixed relative position with respect to the optical axis direction, and the distance between the at least one lens and the image sensor in the optical axis direction is An endoscopic device characterized in that focusing is performed by changing the focus. 2. A distance in the optical axis direction between at least one lens of the lenses forming the imaging lens system and the image sensor is changed by moving the image sensor along the optical axis. The endoscope imaging apparatus according to claim 1, wherein the endoscope imaging apparatus is configured as described above. 3. The at least one lens and the image sensor by moving the diaphragm means and at least one lens of the lenses forming the imaging lens system along an optical axis. The endoscope imaging apparatus according to claim 1, wherein the interval between the two is changed.