JPH07184841A - Electronic endoscope - Google Patents

Abstract

PURPOSE:To enable the washing of fouling adhering to an observation window effectively by allowing the jetting out of air for washing and washing water to the observation window independently of the position of the observation window. CONSTITUTION:This apparatus is made up of a feed air/feed water pipeline 9 for feeding air and water formed by joining to an external part of an objective lens socket 7 fixed with a plurality of lenses fastened at specified positions and a jetting nozzle 17 which is connected to an end part 13a corresponding to the side of an observation window 11 of the feed air/feed water pipeline 9 and bent to the side of the observation window 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical electronic endoscope, and more particularly to cleaning an observation window which is a first surface of an endoscope on a side of an object to be inspected.

[0002]

2. Description of the Related Art Conventionally, when an electronic endoscope is directly inserted into the body, it is exposed to a body fluid such as saliva or blood or a foreign substance as shown in FIG. If dirt adheres to the observation window 105), a shadow may appear on the inspection image or the image may become unclear. Therefore, the dirt is cleaned by ejecting cleaning air and cleaning water from the nozzle 107 toward the observation window 105.

[0003]

However, in the conventional electronic endoscope 101, the nozzle 111 for ejecting the air and the cleaning water covers the base 109 which is a component of the distal end portion of the electronic endoscope 101. The objective lens barrel 113 having a plurality of lenses 103 fixed to predetermined positions is screwed to the base 109. Therefore, when the focus is adjusted by changing the distance between the solid-state imaging device 115 and the lens 103, that is, when the objective lens barrel 113 is screwed into the base 115, the position of the observation window 105 changes. 10
9 is the distance between the cap 111 and the observation window 105 and the nozzle 1
It is necessary to make adjustments based on the positional relationship of 07.

When the space between the cap 111 and the base 109 is adjusted by inserting a spacer between the cap 111 and the base 109, for example, when the minimum pitch of the spacer is 0, 1 (mm), it is actually adjusted. If the desired interval is 0,15 (mm), there is no choice but to adjust it to 0,1 (mm) or 0,2 (mm), which causes an error of 0,05 (mm). There is a problem that the water is not accurately ejected to the observation window 105 and the dirt on the observation window 105 cannot be washed. There is also a problem that it takes time to adjust the gap between the cap 111 and the base 109.

The present invention has been made in view of the above circumstances, and an object thereof is to accurately eject cleaning air and cleaning water to the observation window and adhere to the observation window regardless of the position of the observation window. An object of the present invention is to provide an electronic endoscope capable of effectively cleaning such dirt, and which does not require adjustment of the interval between the nozzle for ejecting cleaning air and cleaning water and the observation window.

[0006]

In order to achieve the above object, the present invention is an objective lens mirror fitted to a base which is a main body of an electronic endoscope and having a plurality of lenses fixed at predetermined positions. A pipe for water supply formed by being joined to the outer portion of the body, and a nozzle connected to the tip corresponding to the inspection object observation side of the pipe and bent to the first surface side of the inspection object observation side When,
It is characterized by the provision of.

[0007]

According to the above construction, a pipe line for supplying air and cleaning water for cleaning dirt on the first surface (observation window) of the object to be inspected on the observation side is provided with an objective in which a plurality of lenses are fixed at predetermined positions. It is joined to a lens barrel, and by connecting a nozzle bent to the observation window side to the end portion of the joined conduit on the observation window side, the adjustment of the observation window when adjusting the focus of the electronic endoscope is performed. Even if the position changes, the positional relationship between the observation window and the nozzle is kept constant regardless of the position.

[0008]

1 is a side sectional view of an electronic endoscope 1 according to the present invention, and FIG. 2 is a sectional view of the objective lens barrel of the electronic endoscope 1 shown in FIG. Is.

As shown in FIGS. 1 and 2, an electronic endoscope 1 according to the present invention has a base 3 which is a main body of the electronic endoscope, a base 3 and a plurality of lenses 5 which are fitted to each other. The objective lens barrel 7 fixed to the position, and the crescent-shaped air / water supply conduit as shown in FIG. 2, which is formed by joining the objective lens barrel 7 and is supplied with cleaning air and cleaning water. 9, a jet nozzle 17 connected to the end 13a of the air / water supply conduit 9 on the observation window 11 side via a joint 15a, and bent to the observation window 11 side, and a cap 19 for covering the base 3. It consists of and.

A solid-state image pickup device 21 is fixed to the base 3 at a predetermined position facing the lens 5.

Further, an air supply / water supply pipe 23 is connected to the other end 13b of the air supply / water supply pipe 9 through a joint 15b.

In the above structure, in order to adjust the focus of the electronic endoscope 1 of this embodiment, the distance between the solid-state image pickup device 21 and the objective lens 7 in which a plurality of lenses 5 are fixed at predetermined positions, that is, The objective lens barrel 7 to which the air / water supply conduit 9 is joined is adjusted depending on the fitting position when fitting to the base 3. The cap 19 is fixed at a predetermined position by a sealant injected between the cap 19 and the base 3.

As described above, in the electronic endoscope 1 of this embodiment, the ejection nozzle 17 is connected to the air / water supply conduit 9 by the joint 1.
5a and the air / water supply conduit 9 is joined to the objective lens barrel 7, the focus of the electronic endoscope 1 is adjusted, that is, the objective lens barrel 7 is fitted to the base 3. Even if the fitting position at the time of fitting is changed, the ejection nozzle 17 is always constant regardless of the distance between the base 3 and the cap 19, and the cleaning air and the cleaning water can be accurately ejected to the observation window 11. it can.

Further, since it is not necessary to adjust the distance between the base 3 and the cap 19, the distance can be kept constant. Therefore, the amount of the sealant injected into the interval can be made constant, and the time and effort required to measure the sealant corresponding to the interval in each electronic endoscope 1 can be reduced.

Incidentally, A- of the air / water supply conduit 9 of this embodiment
The cross-sectional shape A is crescent-shaped as shown in FIG. 2, but is not limited to this and may be another shape, for example, circular as shown in FIGS.

Further, A- of the objective lens barrel 7 of the present embodiment.
The cross-sectional shape of A is a shape obtained by combining a circle and an ellipse as shown in FIG. 2, but the shape is not limited to this, and may be another shape such as the ellipse shown in FIG. 3 or the circle shown in FIG. Is also good.

Further, in the electronic endoscope 1 of the present embodiment, the objective lens barrel 7 to which the air / water feeding conduit 9 is joined is fitted to the base 3, but the present invention is not limited to this, and FIG. The objective lens barrel 7 may be fitted into the cap 19 as shown in FIG. In this case, the focus adjustment of the electronic endoscope 1 is adjusted by the fixing position of the cap 19. Furthermore, at this time, the AA cross-sectional shape of the air / water supply conduit 9 is not limited to the crescent shape as described above, and may be circular as shown in FIGS. 3 and 4, for example. Further, the AA cross-sectional shape of the objective lens barrel 7 is not limited to the shape of a combination of a circle and an ellipse as shown in FIG. 2, but other shapes such as the ellipse shown in FIG. 3 and FIG. It may be circular as shown.

[0018]

As described above, according to the electronic endoscope of the present invention, the pipeline for supplying the air and the cleaning water for cleaning the dirt on the first surface (observation window) on the observation side of the inspection object. Is joined to an objective lens barrel in which a plurality of lenses are fixed at predetermined positions, and a nozzle bent to the observation window side is connected to the observation window side end of the conduit joined to the objective lens barrel. Therefore, even if the position of the observation window changes when adjusting the focus of the electronic endoscope, the positional relationship between the observation window and the nozzle is kept constant regardless of the position, and cleaning air and cleaning water are kept. Accurately jets to the observation window, it is possible to effectively clean the dirt adhering to the observation window, and there is no need to adjust the gap between the nozzle and the observation window, which reduces the time and effort required when manufacturing an electronic endoscope .

[Brief description of drawings]

FIG. 1 is a side sectional view of an electronic endoscope according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of the objective lens barrel portion of the electronic endoscope shown in FIG.

FIG. 3 is a cross-sectional view taken along the line AA of the objective lens barrel portion in which the shape of the air / water feeding conduit shown in FIG. 2 is circular and the shape of the objective lens barrel is oval.

FIG. 4 is a cross-sectional view taken along the line AA of the objective lens barrel portion in which the shape of the air / water feeding conduit shown in FIG. 2 is circular and the shape of the objective lens barrel is circular.

FIG. 5 is an explanatory diagram showing an example of an electronic endoscope when the objective lens barrel is fitted in a cap.

FIG. 6 is a side sectional view of a conventional electronic endoscope.

[Explanation of symbols]

 1 Electronic Endoscope 3 Base 5 Lens 7 Objective Lens Body 9 Air / Water Supply Pipeline 11 Observation Window 17 Jet Nozzle 19 Cap 21 Solid-state Image Sensor

Claims (1)

[Claims] 1. A conduit for air supply and water supply, which is formed by joining a plurality of lenses to an outer side portion of an objective lens barrel fixed to a predetermined position, and corresponds to an inspection object observation side of the conduit. An electronic endoscope, comprising: a nozzle that is connected to the tip of the nozzle and that is bent to the first surface side of the object to be inspected.