JPS6036242Y2 - Side-viewing tip camera endoscope - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a distal end camera type endoscope having a photographing device at the distal end.

The distal end camera type endoscope is equipped with a cassette storage section in the distal end body, and a film cassette is attached and detached each time a photograph is taken.

Therefore, when the film cassette is replaced, dust tends to enter the photographing device, and the dust adheres to the final surface of the photographic lens.

This attached dust has a disadvantage in that it adversely affects photographic image quality and also affects diagnosis.

However, in conventional endoscopes of this type, the only way to remove dust adhering to the final surface of the photographing lens was to disassemble the tip body of the endoscope, and the dust could not be deposited on the final surface of the photographic lens. Currently, even if the photo quality deteriorates due to adhesion, it is still used as is to a certain extent.

This idea was made based on the above circumstances, and its purpose was to create an opening that could be opened and closed on the side of the endoscope's distal end body, facing the final surface of the photographic lens provided in the endoscope's distal end body. The present invention aims to provide an endoscope with an advanced camera, which is provided with a window, can be easily cleaned when dust adheres to the lens surface, and can always obtain the best image quality.

Hereinafter, this invention will be explained based on one embodiment shown in the drawings.

Reference numeral 1 in FIG. 1 is a tip main body attached to the tip of a flexible tube 2 of an endoscope.

A concave portion 3 is provided at the tip of the tip main body 1, and a female thread 4 is cut into the inner peripheral wall of the concave portion 3.

A cap 6 having a male thread 5 screwed into the female thread 4 is removably attached to the opening of the recessed portion 3.
A cassette storage section 7 is formed inside.

Furthermore, this cassette storage section 7 includes a film cassette 8.
is stored, and this film 9 is placed in the film exposure opening 1.
0, and its tip end is the operating section of the endoscope (not shown).

) via a wire 11.

Furthermore, an illumination window 12 and an observation window 13 are arranged side by side on the side wall of the tip main body 1.

The illumination window 12 is connected to the light guide fiber 14.
are placed facing each other.

Further, an image guide fiber 17 faces the observation window 13 via a prism 15 and an objective lens 16.

Further, a photographing lens 18 is provided opposite to the prism 15, and is configured to form an image on the film surface passing below the film exposure opening 10.

Then, the photographing lens 18 and the film exposure opening 1
0, a shutter 19 is slidably installed.

Further, an opening window 20 is bored in the side wall of the tip main body 1 facing the final surface 18a of the photographing lens 18, and penetrates to the final surface 18a of the photographing lens 18.

Furthermore, a female thread 21 is cut into the inner peripheral wall of the opening window 20, and an opening/closing lid 23 having a thread 22 cut into the outer peripheral wall is screwed onto the opening window 20.

Therefore, when replacing the film cassette 8, turn the cap 6 to remove it, pull out the film cassette 8 from the cassette storage section 7, install a new film cassette 8 into the cassette storage section 7, and then screw the cap 6 on. Installing.

At this time, dust may enter from the outside and adhere to the final surface 18a of the photographic lens 18, adversely affecting the photographic image quality.

In this case, the opening/closing lid 23 can be removed and dust on the final surface 18a of the photographing lens 18 can be wiped off from the opening window 20.

After cleaning in this way, the opening/closing lid 23 is screwed onto the opening window 20 again to complete the cleaning.

In the above embodiment, the opening/closing lid 23 is screwed in, but as shown in FIG.
By providing a recess 25 on the inner peripheral wall of the opening/closing lid 2 and providing a flange 27 and a convex portion 28 on the rubber opening/closing lid 26, the opening/closing lid 2
6 into the opening window 24, the convex portion 28 and the concave portion 25 can be elastically engaged.

Moreover, at this time, the flange portion 27 comes into close contact with the opening edge of the opening window 24, and can be kept watertight.

Furthermore, as shown in FIGS. 3 and 4, a case 29 is fitted to the tip body 1, a first opening window 30 is provided in the tip body 1, and the first opening window is provided in the case 29. A second opening window 31 slightly larger than 30 is provided.

Then, an arc-shaped opening/closing lid 32 that follows the curvature of the case 29 is attached to the second opening window 31, and a plurality of screws 33 are attached.
Tighten and fix with...

In this case, since the sealant 34 is attached to the inner surface of the opening/closing lid 32, the lid 32 comes into close contact with the tip body 1 and can be held watertight.

As explained above, this device has an opening window that can be opened and closed on the side wall of the tip body that faces the final surface of the photographic lens provided on the tip body of the endoscope, so that dust does not get on the final surface of the photographic lens. Even if it gets stuck, it can be easily cleaned from the open window.

Therefore, it is possible to always obtain the best image quality.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the distal end body of an endoscope showing one embodiment of this invention, Fig. 2 is a longitudinal sectional view showing another embodiment of this invention, and Fig. 3 is a further different embodiment of this invention. FIG. 4 is a longitudinal cross-sectional view showing the embodiment, and FIG. 4 is a cross-sectional view taken along the line ■-■ in FIG. 1...Tip body, 18...Photographing lens, 20...Opening window, 23...Opening/closing lid.

Claims (1)

[Scope of utility model registration request] In a side-viewing tip camera type endoscope equipped with a photographing lens provided on the distal end body of the endoscope and having an optical axis in a direction different from the axial direction of the distal end body, a side-viewing tip camera type endoscope that is disposed opposite to the final surface of the photographing lens. The side-viewing tip camera type is characterized in that it further comprises: an aperture provided through the tip main body up to the final surface of the photographing lens; and a lid removably provided on the aperture window. Endoscope.