JP2003290119A - Endoscopic imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the upward direction of a camera head and the upward direction of a solid state imaging device coincide regardless of the rotating operation of an endoscope, and at the same time, to prevent a light-guiding cable from being twisted more than required. <P>SOLUTION: The endoscope 10 internally contains an optical system which transmits an observation image and a first light guide for illumination which is arranged parallel with the optical system. The camera head 20 internally contains the solid state imaging device 35 which photographs the observation image transmitted from the optical system. A light guide bundle 32 is internally contained in the camera head 20, and is separated/connected from/with the first light guide of the endoscope 10 in a plane which is parallel with the connecting surface between the endoscope 10 and the camera head 20. Cam grooves 51 and 52 and a stopper pin 53 make the endoscope 10 rotatable by 360° or more about the optical axis of the solid state imaging device 35 as the center, and at the same time, perform a rotation restriction at a specified rotating angle. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope image pickup apparatus for picking up an observation image transmitted from an optical system of an endoscope with a solid-state image pickup device.

[0002]

2. Description of the Related Art In recent years, medical endoscopes have been widely used in which a slender insertion portion is inserted into a body cavity to observe organs and the like in the body cavity to diagnose the affected area in detail.

An example of such a medical endoscope is a rigid endoscope having a hard and non-bending insertion portion.

Generally, a rigid endoscope is composed of an insertion portion containing an optical system for objective and image transmission and an eyepiece optical system for showing a subject image to an operator, and the periphery of the optical system of the insertion portion is for illumination. A light guide is provided by the optical fiber bundle.

The light guide is projected from the endoscope main body by a light guide post in front of the eyepiece, and is connected to the light source device via the light guide cable.

On the other hand, a camera head mounted on an eyepiece portion of an endoscope for observing with a monitor has become widespread with the development of endoscopic surgery. The camera head has a built-in solid-state image sensor, and photoelectrically converts an endoscope image from the eyepiece of the endoscope.

As an example of such a technique, Japanese Patent Laid-Open No. Sho 63-63
There is a rigid electronic endoscope in which the endoscope and the camera head described in JP-A-274908 are integrated.

However, in the rigid electronic endoscope disclosed in Japanese Patent Laid-Open No. 63-274908, even when the light guide cable is divided into several parts, the solid-state image pickup element can be moved up by the rotation of the insertion portion at the tip. It changed and could not be used for arthroscopic surgery.

For example, in arthroscopic observation and surgery, 3
To observe the inside of the (knee) joint cavity over a wide area using a 0 ° oblique endoscope, rotate the insertion part largely around the optical axis to rotate the visual field by 360 ° or shake the tip direction. I am using it like this. Particularly in the former case, the light guide or the light guide post is gripped and the rotation operation is performed around the optical axis of the endoscope insertion portion.

In this case, particularly when the arthroscope is used, the up direction of the solid-state image pickup device is matched with the up direction of the camera head in order to keep the relationship between the up direction of the endoscope and the monitor image constant and to provide orientation. As the camera head is not rotated even when the insertion portion is rotated, the upper and lower parts of the image can always be kept grasped by the operator. If you rotate the camera head, you will not know which direction you are approaching.

If the light guide post and the light guide cable project toward the side of the endoscope near the patient, they may interfere with the patient or interfere with the operation of the treatment instrument for the endoscope.

In response to this, Japanese Patent Laid-Open No. 6-1879
No. 0 publication has a built-in light guide in the camera head,
A method has been disclosed in which a light guide is connected at an end surface of a connecting portion between an endoscope and a camera head.

In this case, the rigid endoscope disclosed in Japanese Patent Laid-Open No. 6-18790 is provided with a plurality of even light guides around the image pickup optical system of the endoscope and the camera head so that the light guide can be rotated at any rotation angle. It is designed to transmit illumination light.

[0014]

However, in the structure described in Japanese Patent Laid-Open No. 6-18790, the endoscope can be used only at arbitrary divided angles, and cannot be used at an intermediate angle. In addition, the number of light guides that can be built-in is limited in the ultra-thin insertion part, and the number of light guides that can be built in at each of these points is very small, but the loss of illumination light from the camera head is different for each connection Occurs at the point,
As a result, the illumination light at the tip of the endoscope becomes considerably dark.

Here, one light guide built in the endoscope and at least one light guide built in the camera head can be connected at the light guide connection end, and the light guide of the light guide built in the camera head. If the connection end side has a structure capable of rotating around the solid-state image sensor in the camera head, the loss of illumination light from the camera head is small, and the camera head supports the exterior and the solid-state image sensor in a state of being positioned, In addition, a structure in which the endoscope can be rotated is established, but it is necessary to provide a rotation stopper structure between the endoscope and the camera head so that the light guide cable is not unnecessarily twisted. As this rotation stopper structure, the rotation stopper structure with a rotation stop described in Japanese Utility Model Laid-Open No. 56-176704 can be used.

The rotation stopper structure described in Japanese Utility Model Laid-Open No. 56-176704 is an example of the most general rotation stopper structure, but the interfering portion of the stopper does not rotate, that is, the rotation angle is the length of the long hole. Therefore, when the camera head is fixed, a blind spot occurs in the direction of the field of view of the endoscope. In particular, when the images from the front and back and from the top and bottom are required, such as the half-moon version and the patella, this blind spot cannot be visually recognized unless the positional relationship between the solid-state image sensor and the top and bottom is shifted, which is extremely inconvenient.

The present invention has been made in view of the above problems of the prior art, and a light guide cable is built in the camera head so that the insertion portion of the endoscope can be rotated with respect to the camera head. In the endoscope imaging device, the endoscope can be rotated by 360 ° or more with respect to the camera head, and the up direction of the camera head and the up direction of the solid-state imaging device are constantly operated regardless of the rotation operation of the endoscope. It is an object of the present invention to provide an endoscope imaging device capable of matching and preventing the light guide cable from being twisted more than necessary.

[0018]

In order to achieve the above object, an endoscope image pickup device according to claim 1 includes an optical system for transmitting an observation image and a first illumination system arranged in parallel with the optical system. An endoscope having a built-in light guide, a camera head that is connected to the proximal end side of the endoscope and has a solid-state image sensor that captures an observation image transmitted from the optical system, and a camera head that is built in the camera head. Is disposed in a peripheral portion around the optical axis of the solid-state image sensor and is separated from the first light guide of the endoscope in a plane parallel to a connection end face between the endoscope and the camera head. , The second light guide for illumination to be connected and the endoscope with respect to the camera head are made rotatable about the optical axis of the solid-state image sensor by 360 ° or more, and at a predetermined rotation angle. A rotation regulation mechanism that regulates rotation Characterized in that it was.

An endoscope image pickup device according to a second aspect of the present invention is the endoscope image pickup device according to the first aspect, wherein the rotation restricting mechanism is provided at a connecting portion between the endoscope and the camera head. It is characterized in that it is constituted by an arcuate groove portion provided between the two and a stopper pin having an arcuate width shorter than the circumferential length of each groove portion.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 5 relate to a first embodiment of the present invention. FIG. 1 is a side view showing the overall configuration of an endoscope imaging apparatus, and FIG. 2 is an endoscope receiving portion. FIG. 3 is a first explanatory view showing the positional relationship between the cam groove and the stopper pin in the rotation angle direction, and FIG. 4 is a second sectional view showing the positional relationship between the cam groove and the stopper pin in the rotation angle direction. And FIG. 5 is a third explanatory view showing the positional relationship between the cam groove and the stopper pin in the rotation angle direction.

(Structure) First, the overall structure of the endoscope imaging apparatus will be described with reference to FIG. The endoscope imaging apparatus 1 includes an endoscope 10, a camera head 20, a general cable 41, a light guide connector 42, an electric system cable 44, and an electric system connector 45.

The endoscope 10 is a rigid endoscope,
It is composed of a non-bending insertion portion 11 and an endoscope connecting portion 12.

At the base end side of the insertion portion 11, the endoscope connecting portion 1
Two are provided. A straight advance key 13 and a lock groove 14 are formed on the outer circumference of the endoscope connecting portion 12.

On the other hand, a slide cover 21 is provided on the front end side of the camera head 20. Camera head 20
The exterior member 22 is provided with a remote switch button 23 and an up index or up direction indicating shape 24.

As shown in FIG. 2, a key mechanism is provided in the endoscope connecting portion 12 of the endoscope 10 and the endoscope receiving portion 25 in the camera head 20. This key mechanism is provided so that the straight-moving key 13 is provided in a convex shape on the side of the endoscope 10 and the straight-moving key groove 26 is provided in the endoscope receiving portion 25 on the side of the camera head 20. With such a key mechanism, the endoscope 1
When the camera head 20 and the camera head 20 are connected to each other, the rotation direction of the endoscope 10 with respect to the optical axis and the vertical direction of the camera head 20 can be mounted in one position.

The lock pin 2 is provided inside the endoscope receiving portion 25.
7 are provided. The endoscope connecting portion 12 is provided with a lock groove 14 with which a lock pin 27 is engaged. The camera head 20 is provided with a slide cover 21 that unlocks the lock pin 27.

The endoscope receiving portion 25 is provided so as to be rotatable about the optical axis of the endoscope 10 with respect to the camera head 20. An image pickup optical system unit 28 is arranged at the center of the endoscope receiving portion 25. A light guide emission end 29 is provided at an arbitrary position on the periphery of the imaging optical system unit 28.

With such a structure, the outer peripheral portion and the flange portion of the endoscope connecting portion 12 of the endoscope 10 and the endoscope receiving portion 25.
The inner peripheral portion and the flange portion are fitted with the optical system of the endoscope 10 and the imaging optical system unit 28, and the light guide and the light guide emitting end 29 of the endoscope 10 positioned.

The coupler base 30 on the camera head 20 side
Is engaged with the endoscope receiving portion 25. The coupler base 30 includes a support portion 31 of the imaging optical system unit 28 and a light guide movement space 33 of the light guide bundle 32.
And an endoscope receiving and engaging portion 34, which are fixed in a state of being positioned with respect to the exterior member 22 of the camera head 20.

A solid-state image pickup device 35 is arranged behind the image pickup optical system unit 28.

The light guide bundle 32 inside the camera head 20 has the light guide emission end 29 fixed to the flange surface of the endoscope receiving portion 25, and the light guide bundle 32 is fixed to the camera head 20.
The light guide connector 42 and the light are inserted through the integrated cable 41 shown in FIG. 1 in a state of being substantially integrated with the electric signal cable connected to the solid-state imaging device 35 and the remote switch 23 shown in FIG. Guide plug 4
It is connected via 3 to a light source device (not shown).

The light guide bundle 32 rotates within the coupler base 30 about the optical axis of the image pickup optical system unit 28 when the endoscope receiving portion 25 to which the light guide emission end 29 is fixed is rotated.

The camera head 20 has an exterior member 22.
The up direction of the built-in solid-state imaging device 35 can be visually and tactually recognized from the outside of the camera head 20 by the button 23 of the remote switch and the up index or the up direction designating shape 24 provided on the.

Hereinafter, the rotation restricting mechanism provided on the endoscope 10 and the camera head 20 will be described in detail.

As shown in FIGS. 2 to 5, the endoscope receiving portion 25 and the coupler base 30 are provided with a cam groove 51 and a cam groove 52 in the circumferential direction at respective positions facing each other on the flange surface. A stopper pin 53 that is slidably movable in the circumferential direction with respect to the cam grooves 51 and 52 is arranged between the cam grooves.

Further, the positional relationship between the cam grooves 51, 52 and the stopper pin 53 in the rotational angle direction will be described with reference to one specific numeral.

As shown in FIG. 3 to FIG. 5, the cam groove 51 is imprinted in the circumferential direction at a total rotation angle of 369 °, which is a rotation angle of 169 ° on one side from the up direction of the camera head 20. On the other hand, the cam groove 52 is imprinted at an angle of 23 ° on one side and 46 ° on both sides from the neutral position.
The cam grooves 51 and 52 may be provided in either the endoscope receiving portion 25 or the coupler base 30. Here, since the stopper pin 53 is rotatable along both the cam grooves 51, 52, the outer peripheral surface and the inner peripheral surface also serve as the cam groove 51, while preventing the inclination.
It is configured to be slidable with at least one of 52 and has a length of 6 ° in the circumferential direction. In the present embodiment, the ends of the cam grooves 51 and 52 and the stopper pin 53 may be rounded in consideration of workability.

In the above angle configuration, the relative rotation angle between the cam groove 51 and the stopper pin 53 is 332 ° (= 169 °) at maximum.
X2-6), similarly, the maximum relative rotation angle between the cam groove 52 and the stopper pin 53 is 40 ° (= 23 × 2-6),
The maximum movable relative angle of the cam grooves 51 and 52 is 372 ° in total.

The cam grooves 51 and 52 and the stopper pin 5
The angle of 3 can be variously applied, and for example, both cam grooves 51 and 52 can be set to 350 ° to make the relative rotation angle large.

With such a configuration, the endoscope 10 incorporates an optical system for transmitting an observation image and a first light guide for illumination arranged in parallel with the optical system.

The camera head 20 has a built-in solid-state image pickup device 35 which is connected to the proximal end side of the endoscope 10 and picks up an observation image transmitted from the optical system.

A light guide bundle 32, which serves as a second light guide for illumination, is built in the camera head 20.
The endoscope 10 and the camera head 2 are arranged in a peripheral portion around the optical axis of the solid-state image sensor 35.
In the plane parallel to the connection end face with 0, the first of the endoscope 10
Separated and connected with the light guide.

The cam grooves 51 and 52 and the stopper pin 53 are
The endoscope 10 is rotatable with respect to the camera head 20 by 360 ° or more about the optical axis of the solid-state imaging device 35, and serves as a rotation regulation mechanism that regulates rotation at a predetermined rotation angle. .

The cam grooves 51 and 52 are provided in the endoscope 10
And an arc-shaped groove provided between the camera head 20 and the camera head 20. Stopper pin 5
3 has an arcuate width shorter than the circumferential length of the cam grooves 51, 52.

(Operation) The operation of the endoscope imaging apparatus of the first embodiment will be described. Endoscope 10 and camera head 20
Is positioned at one place by fitting the key mechanism by the convex straight-movement key 13 provided in the endoscope 10 and the straight-movement key groove 26 provided in the endoscope receiving portion 25 in the camera head 20. It is fitted and inserted in the state of being taken out, and is fixed by the lock mechanism.

At the connection portion of the relay optical system (not shown) of the endoscope 10 and the image pickup optical system unit 28, the observation image passing through the endoscope 10 is transmitted, and the solid-state image pickup device 35 photoelectrically converts the image. It is displayed as an observation image on the monitor.

Illumination light is transmitted from a light source device to a light guide emission end 29 provided around the image pickup optical system unit 28 through a light guide bundle 32 in the camera head 20.

Here, the endoscope receiving portion 25 is provided with respect to the main body of the camera head 20, that is, the optical axis of the solid-state image pickup device 35.
It can be arbitrarily rotated within a fixed angle range. For example, the tip is 3
In the oblique-viewing endoscope facing the direction of 0 °, the solid-state image sensor 3
Generally, the state of facing downward with respect to 5 is neutral, and when the outer peripheral portion of the endoscope receiving portion 25 is held from this position and a rotating operation is performed, the endoscope receiving portion 25 and the key mechanism are The endoscope 10 thus integrated is rotated.

At this time, the stopper pin 53 is provided in the cam groove 5
From the neutral position of the center of both 1, 52, it turns along both cam grooves, and finally 1 side of the cam groove 51.
The total of 69 ° and 23 ° on one side of the cam groove 52 is rotated by an angle obtained by subtracting 6 ° in the circumferential direction of the stopper pin 53, and the stopper pin 5 is attached to the opposite ends of the cam grooves 51 and 52.
The rotation ends in the state where the opposite ends of 3 are in contact with each other. That is, the endoscope 10 rotates at a maximum of 186 ° on one side and 372 ° on both sides.

In this case, the stopper pin 53 is provided in the cam groove 5
Surrounded by and supported by 1, 52. Further, the stopper pin 53 is in contact with the cam grooves 51 and 52 at the circumferential portion and slides.

When the endoscope 10 is rotated, the camera head 2
The light guide bundle 32 in 0 rotates the endoscope 10 which is integrated with the endoscope receiving portion 25 connected to the endoscope 10 by the key mechanism.

At this time, the stopper pin 53 is in the cam groove 5
From the neutral position of the center of both 1, 52, it turns along both cam grooves, and finally 1 side of the cam groove 51.
The total of 69 ° and 23 ° on one side of the cam groove 52 is rotated by an angle obtained by subtracting 6 ° in the circumferential direction of the stopper pin 53, and the stopper pin 5 is attached to the opposite ends of the cam grooves 51 and 52.
The rotation ends in the state where the opposite ends of 3 are in contact with each other. That is, the endoscope 10 rotates at a maximum of 186 ° on one side and 372 ° on both sides.

In this case, the stopper pin 53 is provided in the cam groove 5
Surrounded by and supported by 1, 52. Further, the stopper pin 53 is in contact with the cam grooves 51 and 52 at the circumferential portion and slides.

When the endoscope 10 rotates, the camera head 2
The light guide bundle 32 in 0 rotates along the circumference of the imaging optical system unit 28 including the solid-state imaging device 35 while maintaining the connection with the endoscope 10, and the imaging optical system unit 28 of the coupler base 30. The state of the maximum rotation angle is obtained while avoiding the support columns of the supporting portion 31.

(Effects) As described above, according to the first embodiment, even in the endoscope image pickup apparatus 1 with the camera head 20 having the light guide bundle 32 built-in, the insertion portion is 360 ° or more. The rotation angle can be secured and the light guide bundle 32 can be prevented from being twisted more than necessary, and the light guide bundle 32 can be protected from twisting.

For example, the endoscope imaging apparatus 1 is required to observe the patella of the knee joint from both the bird's-eye view and the supine direction, but the endoscope from the neutral position (top-down state) of the solid-state image sensor 35 is used. You can carry out the operation up to 180 degrees and look up without stress.

Further, according to the first embodiment, since the stop pin 53 relatively moves in the circumferential direction, the stopper pin 53 may be inclined or the stopper pin 53 may be unevenly worn on the sliding surface. Absent.

Further, according to the first embodiment, since the rotation restricting mechanism is provided in the camera head 20, the stopper pin 53 and the cam are provided as in the case where they are provided at the connecting portion between the endoscope and the camera head 20. The unevenness around the grooves 51, 52 does not appear on the outer surface,
Cleanability is secured.

Further, according to the first embodiment, if the light guide bundle 32 has a margin, the rotation angle of about 600 ° can be secured by widening the cam groove length.

In the actual procedure of arthroscope, it is necessary to attach an outer tube to the endoscope and to send or discharge the perfusate between the endoscope and the outer tube. The pipe is provided with a reflux liquid post that connects the water pipes. If the reflux liquid post and the outer tube or the endoscope cannot be rotated, the reflux liquid post or the water supply pipe interferes with the patient, etc., so the rotation operation of the endoscope is not continued in one direction. . Even if the reflux liquid post and the outer tube or the endoscope are configured to be rotatable, it is necessary to rotate the endoscope while supporting the reflux liquid post or the water supply pipe. Therefore, the rotation operation of the endoscope is not continued in one direction.

(Second Embodiment) FIG. 6 shows a second embodiment of the present invention.
FIG. 3 is a side view showing the overall configuration of the endoscope imaging apparatus according to the embodiment of FIG.

In the description of FIG. 6, the first shown in FIG.
The same components as those in the embodiment are denoted by the same reference numerals and the description thereof is omitted.

In FIG. 6, the endoscope image pickup device 6 includes an endoscope 60, a camera head 70, a general cable 41, and
A light guide connector 42, an electric system cable 44,
It is composed of an electrical connector 45.

In the second embodiment, with respect to the camera head 70, the endoscope 60 is placed around the optical axis of the image pickup element.
A rotation restricting mechanism that restricts rotation at a predetermined rotation angle while being rotatable by 0 ° or more is provided on the endoscope 60 side.
In this case, the slide cover 21 serving as a rotation operation unit is provided on the endoscope 60, and the straight-movement key 13 and the lock groove 14 are provided on the camera head 70.

(Operation) In the second embodiment, the endoscope 6 is used.
By operating the slide cover 21 provided on the
It is possible to rotate the endoscope 60 as in the above embodiment.

(Effect) According to the second embodiment, the first
In addition to the same effect as in the embodiment described above, the light guide bundle and the imaging optical system can be provided on the endoscope 60 side by providing the rotation restricting mechanism on the endoscope 60 side. The diameter can be reduced and the overall size can be reduced.

Further, if the image pickup optical system in which the solid-state image pickup element is integrated is used, electrical insulation between the metal parts of the connecting portion between the endoscope and the camera head and the image pickup optical system is taken as an internal measure. It is unnecessary in the mirror and contributes to the overall size reduction.

(Third Embodiment) FIG. 7 shows a third embodiment of the present invention.
3 is a perspective view showing a stopper pin of the endoscope imaging apparatus according to the embodiment of FIG.

In the description of FIG. 7, parts other than those shown in FIGS. 1 to 6 will be used instead. (Structure) As shown in FIG. 7, the stopper pin 83 has the structure shown in FIG.
The shape of the sliding fitting portions 91 and 92 to be inserted into the cam grooves 51 and 52 shown in FIG. 5 is changed corresponding to the cam grooves 51 and 52, and the stopper pin 83 has the pin flange 84. The stepped portion 85 is formed by providing the step 85.

(Operation) The basic operation of the third embodiment is as follows.
This is the same as in the first and second embodiments. The difference in the third embodiment is that the stepped portion 86 of the stopper pin 83 hits the flange surface of the endoscope receiving portion 25 and the coupler base 30 when a force in the tilt direction is applied during the rotation operation of the endoscope. The inclination of the stopper pin 83 is restricted above a certain level.

(Effect) According to the third embodiment, the first
The same effect as that of the embodiment described above can be obtained, and with respect to the flange surfaces of the endoscope receiving portion 25 and the coupler base 30,
Since the stepped portion 86 of the stopper pin 83 hits, the stopper pin 83 does not tilt, and the operability at both ends of rotation is excellent. Also,
The rattling of the stopper pin 83 is reduced, and the dead zone is reduced.

In the first to third embodiments, the structure of the present invention is applied to the endoscope image pickup apparatus using the rigid endoscope, but the endoscope in which the insertion portion is bendable is used. It may be applied to endoscopic imaging.

[Additional Notes] According to the above-described embodiment of the present invention described in detail above, the following configuration can be obtained.

(Additional Item 1) An endoscope including an optical system for transmitting an observation image and a first light guide for illumination which is arranged in parallel with the optical system, and a proximal end side of the endoscope. And a camera head having a built-in solid-state image pickup element for picking up an observation image transmitted from the optical system, and a camera head built in the camera head and arranged in a peripheral portion around the optical axis of the solid-state image pickup element, With respect to the camera head and a second light guide for illumination that is separated from and connected to the first light guide of the endoscope in a plane parallel to the connection end surface between the endoscope and the camera head. An endoscope comprising: a rotation restricting mechanism that allows the endoscope to rotate 360 ° or more around the optical axis of the solid-state imaging device and restricts rotation at a predetermined rotation angle. Imaging device.

(Supplementary Note 2) The rotation restricting mechanism is formed by an arcuate groove portion provided between the endoscope and the camera head at a connection portion between them, and a circumferential length of each groove portion. The endoscope imaging device according to appendix 1, wherein the endoscope imaging device is configured with a stopper pin having a short arc-shaped width.

(Additional Item 3) The endoscope imaging apparatus according to Additional Item 1 or 2, wherein the endoscope is a rigid endoscope.

[0077]

As described above, according to the first and second aspects of the present invention, in the endoscope image pickup device in which the insertion portion of the endoscope can be rotationally operated with respect to the camera head, In addition to allowing the endoscope to be rotated by 360 ° or more, the up direction of the camera head and the up direction of the solid-state image sensor are always matched regardless of the rotation operation of the endoscope, and the light guide cable is twisted more than necessary. Since it is possible not to do so, the operation from turning the endoscope 180 ° from the neutral point (overhead view state) of the solid-state imaging device to looking up can be performed without stress.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of an endoscope imaging apparatus according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an endoscope receiving portion and its periphery according to the first embodiment of the present invention.

FIG. 3 is a first explanatory diagram showing a positional relationship between a cam groove and a stopper pin in a rotation angle direction according to the first embodiment of the present invention.

FIG. 4 is a second explanatory diagram showing a positional relationship between the cam groove and the stopper pin in the rotation angle direction according to the first embodiment of the present invention.

FIG. 5 is a third explanatory diagram showing the positional relationship between the cam groove and the stopper pin in the rotation angle direction according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an overall configuration of an endoscope imaging apparatus according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a stopper pin of the endoscope imaging apparatus according to the third embodiment of the present invention.

[Explanation of symbols]

1 ... Endoscopic imaging device 10 ... Endoscope 11… Endoscope connection part 12 ... Insertion part 20 ... Camera head 28 ... Imaging optical system unit 32… Light guide 35 ... Solid-state image sensor ... 51, 52 ... Cam groove 53 ... Stopper pin

Claims (2)

[Claims] 1. An endoscope including an optical system for transmitting an observation image and a first light guide for illumination arranged in parallel with the optical system; and an endoscope connected to a proximal end side of the endoscope, A camera head having a built-in solid-state image pickup device for picking up an observation image transmitted from an optical system, and a camera head built in the camera head and arranged in a peripheral portion around an optical axis of the solid-state image pickup device and A second light guide for illumination that is separated from and connected to the first light guide of the endoscope in a plane parallel to the connection end surface between the mirror and the camera head; An endoscope imaging apparatus comprising: a rotation restriction mechanism that allows a mirror to rotate 360 ° or more around the optical axis of the solid-state imaging element and restricts rotation at a predetermined rotation angle. 2. The rotation restricting mechanism has arcuate groove portions provided between the endoscope and the camera head at a connecting portion between them, and an arc shape shorter than a circumferential length of each groove portion. The endoscope imaging apparatus according to claim 1, wherein the endoscope imaging apparatus is configured with a stopper pin having a width of.