JPS604918A - Display device for endoscope - Google Patents

Abstract

PURPOSE:To perform photography with a sufficient quantity of light even when a photographing device is attached while a display device is attached to an endoscope eyepiece, and simplify structure and attain cost reduction. CONSTITUTION:A lens holding cylinder 20 equipped with a lens 19 is provided to the connection part 13 of a main body 8 in one body. A rectangular hole 20a perpendicular to the axial direction is bored in the lens holding cylinder 20, and a prism frame 21 is provided in the rectangular hole 20a in an upward/ downward movable state. A half-prism 24 and a transmission prism 25 are fitted to the flat part 22 of the prism frame 21 one over another adjacently. Guide members 27 and 27 which projected upward and downward from the lens holding cylinder 20 are inserted into guide holes 26 and 26 loosely and vertically to constitute a prism switching mechanism 28 which moves up and down the prism frame 21 linearly along the guide members 27 and 27. A pin receiving groove 29 is cut in the outer circumferential surface of the arcuate part 23 of the prism frame 21 and engages a prism switching pin 30 projected at the front end of a interlocking ring 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endoscope viewing device that can take pictures by attaching a photographing device to the viewing device attached to the endoscope eyepiece.

A viewing device attached to an endoscope eyepiece has an observation eyepiece in its main body, and a secondary eyepiece at the tip of a flexible tube leading out from the main body. The system allows two examiners to simultaneously observe from the observation eyepiece and the child eyepiece. Therefore, a light amount dividing means consisting of a half prism is provided in the main body of the viewing device, and a part of the light incident along the optical axis of the endoscope eyepiece is transmitted to the observation eyepiece, and the remaining part is transmitted to the observation eyepiece. It is configured to be reflected to the secondary eyepiece.

In this way, if the viewing device divides the light from the endoscope eyepiece into two parts, the light from the endoscope eyepiece and the child side, the amount of light necessary for photographing is insufficient on either eyepiece side, and the camera is attached to one side. A clear image cannot be obtained even when shooting.

Therefore, the present applicant has filed applications for an endoscope viewing device that solves the above problems in Japanese Patent Application No. 57-190456 and Utility Application No. 57-164039.

However, the above structure has a structure in which a prism frame in which a barf cylindrical prism and a transmission prism are provided adjacent to each other in a direction perpendicular to the optical axis is moved up and down by a cam groove and a pin that engages with the prism frame.

Therefore, in order to move the prism frame smoothly, each part is required to have high processing accuracy, which causes an increase in costs.

This invention was made by paying attention to the circumstances of upper equipment, and its purpose is to provide sufficient photographic performance even when a viewing device is attached to the endoscope eyepiece and a photographing device is attached. It is an object of the present invention to provide an endoscope viewing device that is capable of photographing with sufficient light intensity, has a simple structure, and is capable of reducing costs.

The present invention will be described below based on an embodiment shown in the drawings. In FIG. 1, 1 is an endoscope, which has a universal cord 5 connected to the operating section 2, insertion section 3, and light source device 4.
It is composed of. Further, the operation section 2 is provided with an endoscope eyepiece section 6, and a viewing device 7, which will be described later, can be attached to the endoscope eyepiece section 6. The main body 8 of the viewing device 70 is provided with an observation eyepiece 9, and is connected to a child eyepiece 11 via a flexible tube 10. A photographing device 12 can be attached to the observation eyepiece 9.

Next, the viewing device 7 and the photographing device 12 will be described in detail.They are constructed as shown in FIGS. 2 to 5. That is, the main body 8 of the viewing device 70 is formed in a cylindrical shape, and a bayonet-type connecting portion 13 that is detachably attached to the endoscope eyepiece portion 6 is provided at its front end. Further, a connecting tube 14 to which an eyepiece 14a is mounted is concentrically provided at the rear end of the main body 8, and a bayonet-type attachment portion 15 is provided at the collar at the rear end.

A cylindrical interlocking ring 16 is rotatably fitted into the connecting tube 14 , and the collar 17 is interposed between the rear end of the main body 8 and the mounting portion 15 . Therefore, the flange 17
The outer peripheral surface of is exposed from the main body 8, and an interlocking bin 18 is provided protruding from a part of this exposed portion.

Further, a lens holding tube 20 to which a lens 19 is mounted is integrally provided at the connecting portion 13 of the main body 8. A square hole 20g perpendicular to the axial direction is bored in this lens holding cylinder 2o, and a prism frame 21 is provided in the square hole 20& to be movable up and down. This prism frame 2 has the square hole 20
It is formed into a substantially semicircular frame shape by a flat portion 22 and an arcuate portion 23 that are loosely inserted into h. Then, on the flat part 22 of this prism frame 2, there is a barf series 24 and a transparent prism 2.
5 are attached vertically adjacent to each other. Further, guide holes 26 are provided in the upper and lower portions of the arcuate portion 23 along the flat portion 22.
26 are drilled. And these guide holes 26°2
6, a guide member 27.27 that projects vertically from the lens holding cylinder 20 is loosely inserted in the vertical direction, and the prism frame 21 is linearly moved up and down along the guide member 27.27. A prism switching mechanism 28 is configured. Further, a convex portion 27a is provided at the intermediate portion of the guide member 27.27, which functions as a stopper for regulating the upper and lower limits of the prism frame 21, and serves as a stopper for regulating the upper and lower limits of the prism frame 21.
4 and the transmission prism 25 are on the optical axis O□ of the endoscope eyepiece 6.
It is now possible to selectively confront. Further, a bottle holder is provided with a groove 29 on the outer peripheral surface of the arcuate portion 23 of the prism frame 21.
is engraved, which engages with a prism switching pin 3o protruding from the front end of the interlocking ring 16. moreover,
The incident end 3 of the flexible tube 10 faces the flat portion 22 of the prism frame 21, so that reflected light from the half prism 24 enters.

On the other hand, the photographing device 12 is an endoscope camera, and the camera body 31 includes an objective lens 32, a mirror 33, a film 34, a prism 35, and the like. A bayonet type connection part 36 is provided at the front end of the camera body 31.
is provided, and is adapted to be removably mounted on the mounting portion 15 of the viewing device 2. Furthermore, this connection part 36
A retaining groove 37 that engages with the interlocking pin 18 of the interlocking ring 16 when attached to the viewing device 7 is carved in a part of the holding groove 37 .

Next, the operation of the endoscope viewing device configured as described above will be explained. When the connecting portion 13 of the viewing device 7 is connected to the endoscope eyepiece 6, the optical axis O3 of the endoscope eyepiece 6 coincides with the optical axis O2 of the viewing device 7. Therefore, a part of the light incident from the endoscope eyepiece 6 passes through the half prism 24 and enters the observation eyepiece 9, and the remaining part is reflected and passes through the flexible tube 10 to the child side. Light enters the eye portion 11.

When the viewing device 7 is attached to the endoscope 1 in this manner, and when the photographing device 12 is further attached to the viewing device 7 to take an observation image, the connecting portion 36 of the camera body 3 is connected to the endoscope 1 for viewing. Attach the mounting part 15 of the device 7. In this case, as is well known, after the connecting part 36 of the camera body 31 is fitted to the mounting part 15, the camera body 31 is rotated to perform bayonet connection. The engagement groove 37 engages with the interlocking pin 18 on the viewing device 7 side. Therefore, in order to bayonet connect the camera body 3
1 is rotated, the rotational force is transmitted to the interlocking ring 16 via the interlocking pin 18. When the interlocking ring 16 rotates, the pin receiver that engages with the prism switching pin 3o applies rotational force to the prism frame 21 via the groove 29. At this time, since the prism frame 21 is loosely fitted to the immovable guide member 27.27, when a rotational force is applied to the prism frame 21 from its outer periphery, the prism frame 21 rises linearly while being guided by the guide member 27.27. . That is, when the rotational movement of the camera body 3 is converted into a linear movement and the prism frame 21 is raised to a predetermined position, the transmission solism 25 is applied to the optical axis 0 of the viewing device 7.
are facing each other. Therefore, the total amount of light incident from the endoscope eyepiece 6 passes through the transmission solism 25 and is guided to the photographing device 12, so that a sufficient amount of light for photographing can be obtained and a clear image can be obtained.

Furthermore, when the camera body 31 is rotated in the opposite direction to release the bayonet connection between the camera body 3 and the viewing device 7 after photographing is completed, the interlocking ring 16 is also rotated in the opposite direction, so the prism switching bin 30 and the pin holder are disposed in the groove. Prism frame 2I via 29
A reverse rotational force is applied to the prism frame 21, and the prism frame 21 is lowered. Therefore, the half prism 24 is connected to the optical axis 02 of the viewing device 7.
The observation eyepiece 9 and child eyepiece 11 can be viewed simultaneously again.

In the above embodiment, the interlocking ring 16 has an integral structure, but the structure is not limited to this, and as shown in FIG. 6, the interlocking ring 16 may be divided into two in the axial direction. By forming in this way, the first member 39 on the camera connection side
The second member 4o on the prism frame connection side is made of strong iron material.
The overall weight can be reduced by using a light material such as glass or aluminum. Furthermore, the rotation of the first member 39 can be transmitted to the second member 40 by providing the first member 39 with the convex portion 4 and the second member 40 with the recess 42 and engaging with each other. Another advantage is that the rotational force when the camera is connected will not cause twisting or tilting and adversely affect the rotational operation.

As explained above, according to the present invention, even if the viewing device is attached to the endoscope eyepiece and the photographing device is attached, the barf cylindrical prism can be switched to the transmission prism in conjunction with the operation of attaching the photographing device. This has the effect of providing a sufficient amount of light for photographing. Moreover, since it is structurally simple, it can be provided at a low price.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Fig. 1 is a schematic diagram of the overall configuration, Fig. 2 is a partially sectional side view of the viewing device and photographing device, Fig. 3 is a perspective view showing the internal structure, and Fig. 4 is the same as Fig. 2 IT- FIG. 5 is a sectional view taken along line ff, FIG. 5 is a configuration diagram showing the entire optical system, and FIG. 6 is a perspective view showing another embodiment of the present invention. 6... Endoscope eyepiece, 7... Viewing device, 8... Main body, 9... Observation eyepiece, 11... Secondary eyepiece, 12
...Photographing device, 24...Half prism, 25...
・Transmission prism, 16.38... Interlocking ring, 21...
Prism frame, 27... Guide member, 28... Prism switching mechanism. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 5 12

Claims (2)

[Claims] (1) A light amount splitting means is provided in the main body, which is attached to the endoscope eyepiece on its front end and has an observation eyepiece on its rear end, and the light is incident along the optical axis of the endoscope eyepiece. In the endoscope viewing device configured to transmit a part of the light to the observation eyepiece side and reflect the remaining part to the secondary eyepiece side, the half prism forming the light amount dividing means and a transmission prism adjacent to each other in a direction perpendicular to the optical axis, and a half prism and a transmission prism are selectively formed by converting rotational motion into linear motion and guiding the prism frame in the linear direction. A prism switching mechanism is constituted by a guide member facing the optical axis, an interlocking ring is provided on the main body that rotates in conjunction with the rotational mounting operation of the imaging device, and the interlocking ring and the prism frame are interlocked. Characteristic endoscope viewing device. (2) The endoscope viewing device according to claim 1, wherein the interlocking ring is divided into two parts in the axial direction and engaged with each other.