JPH05130972A - Head part for electronic endoscope - Google Patents

Abstract

PURPOSE:To provide the head part for an electronic endoscope capable of shortening the length of a hard part at the head of an inserting part. CONSTITUTION:A circuit board 40 wiring an electronic circuit connected to a solid-state image pickup device 31 is arranged in an inserting part head 11 of the endoscope, and a signal cable 43 with plural signal lines 44 banded with one sheath tube 45 is inserted in the inserting part. At the head part of the electronic endoscope connecting the signal lines 44 to the circuit board 40, the head of the sheath tube 45 of the signal cable 43 is positioned between both front and rear terminals of the circuit board 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip portion of a so-called electronic endoscope in which a solid-state image pickup device is built in a tip portion of an insertion portion of the endoscope.

[0002]

2. Description of the Related Art In a so-called electronic endoscope, a circuit board in which an electronic circuit connected to a solid-state image pickup device is wired is arranged in the tip of an insertion portion of the endoscope, and a plurality of signal lines are connected to one outside. The signal cables bundled by the tubes are inserted into the insertion portion to connect the signal lines to the wiring of the circuit board.

FIG. 9 shows such a conventional circuit board 101.
The right-angle prism 103 is arranged at the rear end of the objective optical system 102 arranged toward the front of the insertion portion, and the solid-state imaging device 1 mounted on the circuit board 101 is shown.
An observation image is formed at 04.

Outer tube 111 of signal cable 110
Is located slightly rearward of the rear end of the circuit board 101, and the signal line 112 extends forward from there.
Electronic components 106 are attached to the circuit board 101,
The tip of the signal line 112 is connected to the vicinity of the rear end of the circuit board 101 by soldering.

[0005]

In the portion where the outer tube 111 is peeled off, the signal cable 110 is connected to the signal line 112.
However, since the mechanical strength is weak, the gap between the tip of the jacket tube 111 and the circuit board 101 is fixed with an adhesive 120 as shown in FIG.

Therefore, the length of the hard portion at the tip of the insertion portion of the endoscope is from the tip to the rear end portion of the adhesive 120, and the hard portion is long and causes great pain to the patient, and is guided in the body cavity. In this case, there are drawbacks such as poor sniper performance for the target part because the small turns cannot be cut.

Therefore, an object of the present invention is to provide a distal end portion of an electronic endoscope capable of shortening the length of the hard portion at the distal end of the insertion portion.

[0008]

In order to achieve the above-mentioned object, the tip portion of the electronic endoscope of the present invention is such that an electronic circuit connected to a solid-state image pickup device is wired in the tip portion of the insertion portion of the endoscope. The circuit board is arranged, and a signal cable obtained by bundling a plurality of signal lines with a single jacket tube is inserted into the insertion section, and the signal line is connected to the circuit board at the tip of the electronic endoscope. The tip of the jacket tube of the signal cable is located between the front and rear ends of the circuit board.

The connection portion between the signal line and the circuit board may be provided near the front end of the circuit board,
The connection portion of the circuit board may be bent inward.

[0010]

Embodiments will be described with reference to the drawings. Figure 1
The tip of the insertion part of an endoscope is shown.

In the figure, reference numeral 1 denotes a curved portion formed at the tip of an elongated flexible tube forming an insertion portion, and a plurality of node rings 2 are rotatably connected by rivets 3. The outer circumference is a mesh tube 4 made of thin metal wire and a jacket tube 5 made of rubber.
Is covered by.

A bending operation wire 7 which is remotely pulled.
Is inserted into the wire guide 8 projecting inwardly from each node ring 2 so as to be able to move back and forth. The tip of each bending operation wire 7 is fixed to the wire guide 8 by silver brazing or the like. Reference numeral 9 denotes a stopper pipe that is fixed to the end of the wire guide 8 by silver brazing or the like to prevent it from coming off.

Reference numeral 11 denotes a tip portion main body connected to the tip of the bending portion 1 via a connecting tube 12, and a metal body portion 11b.
And a head portion 11a made of an electrically insulating plastic and joined to the tip portion thereof.

The tip end main body 11 has a circular cross-sectional shape when viewed from the tip end side (left side in FIG. 1), and the objective optical system 13 is built in the head portion 11a. The objective optical system 13 is composed of a plurality of lenses, the axial direction of which coincides with the axial direction of the tip end main body 11, and the object in front is the subject. The observation window 14 is formed by the most advanced lens of the objective optical system 13.

Reference numerals 15 and 16 denote lens frames in which the respective lenses of the objective optical system 13 are fitted and adhered, and the outer lens frame 15 is joined to the head portion 11a of the tip end main body. 17 is an aperture stop. Reference numeral 18 is an O-ring for sealing.

Light guide fiber bundle 21 for illumination
The output end 21a of the optical axis is fixed to the head 11a of the tip body with its axis parallel to the objective optical system 13. A light distribution lens (concave lens) 22 for expanding the light distribution angle of the emitted illumination light is arranged on the end surface.

In this way, the light distribution lens 22 is used for the illumination window 2.
3 is formed, and the illuminating light transmitted through the illumination light guide fiber bundle 21 illuminates a subject in front of the tip end main body 11.

A solid-state image pickup device 31 is arranged in the body 11b of the tip end main body 11. As the solid-state image sensor 31, for example, a CCD (charge coupled device) is used. An image receiving surface 31a of the solid-state image pickup device 31 is formed in a square or a rectangle, and is arranged parallel to the central axis of the objective optical system 13.

The objective optical system 13 and the solid-state image sensor 3
A right-angled prism 33 is arranged between the optical axis of the objective optical system 13 and the image receiving surface 31a of the solid-state image pickup device 31.
It is reflected at right angles so that it intersects perpendicularly with the center of.

The right angle prism 33 and the objective optical system 13
Between the connection tube 34 and the rear half of the lens frame 16.
A light-shielding mask 37, a color correction filter 35, and a low-pass filter 36 are inserted therein.

With such an arrangement, the image of the subject on the left side of FIG.
The image is formed on the image receiving surface 31a of. The circuit board 40 to which the solid-state imaging device 31 is attached is, as shown in FIG.
As a material, a single flexible electrically insulating plastic plate is used.

The circuit board 40 is formed into three folds and is sequentially bent along the broken line portion of FIG. 2 along the axial direction of the tip end main body 11 to be divided into a plurality of parallel planes. Electronic circuits connected to the solid-state image sensor 31 are wired and various electronic components 41 are attached to the planes 40b and 40c of the circuit board 40 on both sides of the plane 40a to which the solid-state image sensor 31 is attached. Then, the soldering terminals 42 provided on the flat surfaces 40b and 40c on both sides thereof
The signal line 44 of the signal cable 43 is soldered to the.

The signal cable 43 is formed by bundling a plurality of signal lines 44 with one jacket tube 45 and inserting the signal tube 44 from the endoscope insertion portion to the bending portion 1. The tip of the jacket tube 45 is connected to the circuit board 40. Positioning the signal cable 43 between the front and rear ends (between the left and right ends in FIGS. 1 and 2) prevents the signal cable 43 from being exposed at a position separated from the circuit board 40.

The end portion of the jacket tube 45 is tightly bound from the outer periphery with a thread or the like, and the mouth portion of the jacket tube 45 where the signal line 44 is exposed is fixed with an adhesive 47. Circuit board 4
As shown in FIG. 3, 0 is formed in a trapezoidal shape that is the same as the outer edge shape of the right-angled prism 33 when viewed from the axial direction of the tip end main body 11, and is disposed immediately behind the right-angled prism 33. .. Therefore, when viewed from the objective optical system 13 side, the outer edge shape of the right-angle prism 33 and the circuit board 40 just overlap with each other, and neither travels much.

An electrically insulating plastic material 46 is filled in the space inside the circuit board 40 that is bent and formed into a trapezoidal shape, and the outside of the circuit board 40 is shielded as shown in FIG. 48 and the insulating tape 49 are covered, and the right angle prism 33 is joined to the solid-state image pickup device 31 to form one unit.

FIG. 4 and FIG. 5 show the circuit board 1 of the second embodiment.
40 and the signal cable 43 are shown, and all the terminals 42 for soldering the signal line 44 are connected to the circuit board 14
They are arranged near the front end of 0. By doing so, the length of the circuit board 140 can be made shorter.

6 to 8 show a third embodiment, in which the soldering terminals 4 arranged at the front end of the circuit board 240 are arranged.
The two parts are bent inward. By doing so, it is possible to further reduce the length of the circuit board 240.

[0028]

According to the tip of the electronic endoscope of the present invention,
Since the tip of the jacket tube of the signal cable is located between the front and rear ends of the circuit board, the rigid part does not project rearward from the rear end of the board, and therefore the length of the rigid part at the tip of the electronic endoscope is shortened. Can be formed. As a result, the insertability into the body cavity is improved, the pain to the patient can be reduced, and the guidance has a small turning effect, which has the excellent effects of improving the sniper performance to the target site.

[Brief description of drawings]

FIG. 1 is a side sectional view of a first embodiment.

FIG. 2 is a development view of the circuit board according to the first embodiment.

FIG. 3 is a rear view of the circuit board according to the first embodiment.

FIG. 4 is a development view of a circuit board according to a second embodiment.

FIG. 5 is a side sectional view of a circuit board and a signal cable according to a second embodiment.

FIG. 6 is a development view of a circuit board according to a third embodiment.

FIG. 7 is a side sectional view of a circuit board and a signal cable according to a third embodiment.

FIG. 8 is a rear view of the circuit board according to the third embodiment.

FIG. 9 is a perspective view of a conventional circuit board and a signal cable.

[Explanation of symbols]

 11 Tip Main Body (Tip of Insertion Section) 31 Solid-state Image Sensor 40 Circuit Board 43 Signal Cable 44 Signal Line 45 Jacket Tube

Claims (3)

[Claims] 1. A signal cable, in which a circuit board having an electronic circuit connected to a solid-state image pickup device is arranged in a distal end of an insertion portion of an endoscope, and a plurality of signal lines are bundled by a single envelope tube. The tip of the jacket tube of the signal cable is positioned between the front and rear ends of the circuit board at the tip of the electronic endoscope that is inserted into the insertion portion and the signal line is connected to the circuit board. The tip of the electronic endoscope characterized by. 2. A tip portion of an electronic endoscope according to claim 1, wherein a connecting portion between the signal line and the circuit board is provided near a front end of the circuit board. 3. The tip portion of the electronic endoscope according to claim 2, wherein the connection portion of the circuit board is bent inward.