JPS5832734A - Endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an endoscope with an improved mounting structure for an image guide within the eyepiece.

Generally, the endoscope C2 is provided with an image guide, and one end of the image guide is held in the eyepiece so as to face the eyepiece.

When one end of the image guide is provided to face the eyepiece 62, a focusing operation is required to align the end surface of the image guide with the focal position of the eyepiece.

Conventionally, the above-mentioned focusing work was done by placing a layer on the end of the image guide (7') by directly moving the mounting frame up and down with the image guide using a bottle set or a screwdriver, and then moving the cylindrical body of the eyepiece at the focused position. However, using such a method (2) not only requires skill because the work is extremely complicated.
There was a problem with poor workability.

In order to solve this problem, the application
As shown in No. 464, the lens frame holding the eyepiece is screwed into the cylindrical body ζ of the eyepiece, and the lens frame is rotated into position (the lens frame that performs focusing from the two be.

However, with such a configuration, when a photographing device such as a camera is attached to the lens frame, there is a problem in that the lens frame is out of focus due to play caused by the screw connection between the barrel and the lens frame. In other words, a lens frame that is screwed to a cylinder cannot have sufficient rigidity, so
Pin: Misalignment occurs.

This invention was made based on the above circumstances, and its purpose is to make it possible to focus an image guide with a simple operation. (-An object of the present invention is to provide an endoscope that has sufficient rigidity to prevent it from becoming out of focus.)

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, 1 is an endoscope consisting of an operating section 2 and an insertion glK3. The insertion section 3 includes a distal end of a flexible tube section 4 (a distal end component 6 is provided via a two-curve tube section 5). An operation knob 7 to be operated, an operation button 8 for air/water supply or suction, an insertion opening body 9 for a treatment instrument such as forceps, and an eyepiece 10 for observing the inside of the body cavity are provided. An optical device (not shown) (=light guide cable 12 having a connector 11 to be connected) is connected.

The eyepiece section 10 is constructed as shown in Figure 2. That is, the operation section 2 (2) has a cylindrical body 13 at the center (2) has a lens frame 15 holding the eyepiece 14 connected to a first fixing screw. 1
6 (2) The mounting is fixed concentrically with the cylindrical body 13. Inside the cylindrical body 13 (2) a focusing frame is formed whose outer diameter is slightly smaller than the inner diameter of the cylindrical body 13. 1
The cylinder wall C2 of the focusing frame 17 has a conical groove 18.
is engraved here, and C2 is a first screw hole 13a formed in the peripheral wall of the cylindrical body 13 with a conical tip.
The adjustment screw 19 is engaged. 1, focusing frame 1
A first flange 20 is provided at the lower end of the cylindrical body 13, and an elastic material such as rubber serving as a biasing member is disposed between the first flange 20 and a step 13b formed at the lower end of the cylindrical body 13. A ring 21 is provided.

Therefore, the focusing frame 17 can be moved up and down by the first adjustment screw 19, and (
2. When raised (2. the above ring 21 is the first tsuba 2)
It is compressed by 0.

The mounting frame 22 is inserted into the interior C2 of the focusing frame 17 with some play in the radial direction. Second adjustment screws 24 each having a conical tip are engaged with the respective screw holes 17a. In addition, at the lower end of the mounting frame 22, a second flange that engages with the lower surface of the first flange 20 provided at the lower end of the focusing frame 17 is provided.
A collar 25 is provided. Therefore, the mounting frame 22 has a C2 shape so that when the focusing frame 17 is lowered, it is lowered together with the focusing frame 17.

Furthermore, the optical fiber bundle 26 is attached to the pipe 2 on the mounting frame 22.
An image guide 28 inserted into the seven gates has one end fitted into it, and this image guide 28 is inserted into the mounting frame 22.
peripheral wall (two screw holes 22a (second screw inserted)
It is fixed by a fixing screw 29. The end surface 28a of the image guide 28 is flush with the end surface of the mounting frame 22, and the mask 30 is not attached here (-).

A fixing screw hole 13C is formed in the peripheral wall of the cylindrical body 13, into which a third fixing screw 31 is screwed. As will be described later, when the focusing of the image guide 2-g is completed, the focusing frame 17 is fixed to the cylindrical body 13 by the third fixing screw 31. Further (11- of the -1' cylindrical body 13 is the second
A through hole 32 for operating the second adjusting screw 24 is formed in a valve membrane at a location corresponding to the second adjusting screw 24 ≦2.

Next (2. Procedure C for focusing the eyepiece 10 having the above structure) will be explained. First, when assembling the eyepiece 10 as shown in FIG. The first flange 20 or ring 21 of the focusing frame 17 is left in a compressed and deformed state.To focus the image guide 2t of the eyepiece 10 assembled in this way, Loosen the first adjusting screw 19. Then, the focusing frame 17 will be displaced downward by the amount that the first adjusting screw 19 is loosened, so that the restoring force of the ring 21 Therefore, the mounting frame 22 in which the first collar 20 and the second collar 25 of the focusing frame 17 are engaged is moved downward by the focusing frame 17 (Since the fixed image guide 28 attenuates and is displaced downward in the optical and axial direction, fine adjustment of the focus of the image guide 28 on the eyepiece lens 14 (2) can be performed. After focusing in this way, Third fixing screw 3
1 and fixes the focusing frame 17 to the cylindrical body 13 (2), the mounting frame 22 is held through the focusing frame 17 without shifting in its axial direction.

Next (2) Displace the mounting frame 22 in the radial direction using the plurality of second mA3 alignment threads 24, align the optical axis of the image guide 28 with the optical axis of the eyepiece 14, and rotate the trench mounting frame 22. Align the direction of the mask 3o. At this time, attach the mounting frame 2
2, the second flange 25 of the focusing frame 17 is held together with the first flange 20+2 of the focusing frame 17 so as not to be displaced upward, and the tip of the second adjustment screw 24 of C2 has a V-shape. status 23
Since the upper inclined surface C2 is in contact and held so as not to be displaced downward, the image guide 28 performed in the previous step
The camera never loses focus.

That is, according to the eyepiece section 10 having the above configuration, by simply operating the first adjusting screw 19, the C image guide 28tl - its optical axis direction≦2 can be displaced together with the mounting frame 22 via the focusing frame 17. You can use the camera to adjust the focus.

Furthermore, since the lens frame 15 is fixed to the cylindrical body 13 that is integrated with the operating section 2, even if a photographing device such as a camera is attached to the lens frame 151, it will not be possible to do so. , Lens frame 15 is loose 1:
1 There is no need to worry about losing focus.

Note that the eyepiece section 10 according to the present invention may have a configuration as shown in FIG. 3. That is, the ring 21 is provided between the ring 21 and the stepped portion 13b formed at the lower end of the cylindrical body 13.

Further, the end of the mounting frame 22 protruding from the cylindrical body 13 (two screws 33 are formed, and the end face of the cylindrical body 13 (= an adjustment nut 34 to be joined and a lock nut 35 to be joined to this adjustment nut 34) I screwed it on.

Such a configuration (according to 2, with lock nut 35 ≦
By loosening the 2n8 adjustment nut 34, the restoring force of the soil distributing blowfish 2 (2) will cause the mounting frame 22 to displace downward when the adjustment nut 34 touches the end surface of the cylinder 13, so the focus of the image guide 28 will be adjusted. Fine adjustment of the alignment can be made in the same manner as in the above embodiment (two steps can be carried out).Then, if the lock nut 35 is tightened with the picking frame 22 displaced and the adjustment nut 34 in contact with the end surface of the cylinder body 13, the adjustment nut 34 will be finely adjusted. Since there is no wobbling, even if the optical axis of the image guide 28 or the direction of the mask 30 is adjusted using the second I8 screw 24 on the focusing stock, the focus of the image guide 28 with respect to the eyepiece lens 14 will shift. There is no such thing.

Although not shown in this embodiment, the upper end of the mounting frame 22 protruding from the cylindrical body 13 (1 forms a second flange 25, and between the second flange 2r and the upper end surface of the cylindrical body 13) In addition to providing a ring 2 (2), a screw 33 is formed at the lower end of the mounting frame 22 protruding into the operating section 2, and an adjustment nut 34 and a lock nut 35 are screwed therein (2). .

Furthermore, in each of the above embodiments, the biasing member is a ring 21 made of a flexible material, but the biasing member may be a plate spring or a coil spring.

As described above, the present invention provides a mechanism for displacing the mounting frame provided in the cylindrical body of the eyepiece section and supporting the image guide in the optical axis direction of the image guide (2) by means of the adjustment mechanism (C2). Therefore, the task of focusing the image guide described above is easy and does not require much effort (it can be done in two steps. Also, since the configuration is such that focusing is performed by displacing the mounting frame, Since the lens frame that holds the eyepiece can be fixed to the cylindrical body, it is possible to prevent the lens frame from shaking and causing the focus to shift when the camera is attached. do not have.

[Brief explanation of the drawing]

Fig. 1 is an overall view of an endoscope showing a simple example of the present invention, Fig. 2 is a sectional view of the eyepiece, and Fig. 3 is a cross-section of the eyepiece showing another embodiment of the invention. It is a diagram. DESCRIPTION OF SYMBOLS 10... Eyepiece part, 13... Cylindrical body, 17... Focusing frame (adjustment mechanism), 21... Ring as biasing member (adjustment mechanism), 22... Mounting frame, 28 ...Image guide, 34...Adjustment nut (adjustment mechanism). Applicant's agent Patent attorney Takehiko Suzue 1 year old Figure 3 Figure 3 726

Claims (1)

[Claims] An endoscope in which a mounting frame is provided inside the cylinder of the eyepiece section, and this mounting frame is configured to support the image guide (2), and an adjustment mechanism for displacing the mounting frame in the optical axis direction of the image guide (2). An endoscope characterized by: