JPH0784193A - Structure for tip part of electronic endoscope - Google Patents

Abstract

PURPOSE:To shorten a tip hard part so as to improve operability, to arrange an observing window at a central position, and to make an arrangement interval between the observing window and a treatment tool inserting channel small. CONSTITUTION:An endoscope where a CCD package 16 having a CCD is arranged in the axial direction of a cylindrical tip hard part has structure where the observing window 15 and an optical system member 4 are arranged in the center of the tip hard part, the CCD package 16 and a circuit substrate 17 are arranged in the vicinity of an inner periphery, and a signal cable 9 is connected to the back side of the substrate 17. At such a time, it is desirable to arrange the rear end faces of the CCD package 16 and the substrate 17 at the same position. Thus, the rear end area of the conventional circuit substrate to which the signal cable is connected becomes useless, and the length of the hard part is shortened by as much as the area which becomes useless, then the observing window 15 is arranged at the central part of the tip end face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tip structure of an electronic endoscope,
In particular, the present invention relates to a structure for efficiently disposing a solid-state image sensor and its circuit board on a rigid tip portion.

[0002]

2. Description of the Related Art FIG. 4 shows a structure of a conventional electronic endoscope tip portion. As shown in FIG. 4 (A), a tip hard portion 1 which is a hard portion is a curved portion 2. It is connected.
An optical system (lens system) member 4 optically connected to the observation window 3 is provided in the tip rigid portion 1, and a solid-state image pickup device (lens system) member 4 is provided on the optical system member 4 via a prism 5, a cover glass 6, and the like. A CCD package 7 having a built-in CCD is attached. Then, a circuit board 8 is attached to the CCD package 7, and a signal cable 9 for transmitting a signal between the CCD and the signal processing circuit is connected to the circuit board 8. A treatment instrument insertion channel 10 for guiding forceps and the like into the body to be observed is arranged below the circuit board 8. Furthermore, as shown in FIG.
Light guides 11, 12 and the like for supplying observation light to the tip surface are arranged.

According to this structure, the tip hard portion 1 and the bending portion 2 are inserted into the body to be observed such as inside the body cavity, and at this time, the tip hard portion 1 is attached by the wire (not shown) attached to the tip hard portion 1. Can be bent vertically or horizontally. Then, the observation light is emitted from the light guides 11 and 12 to the inside of the body to be observed, the inside of the body to be observed is imaged by the CCD, and the treatment instrument is passed through the treatment instrument insertion channel 10 while observing the image in the body to be observed. Can be used.

[0004]

By the way, in the above-mentioned electronic endoscope tip portion, since the above-mentioned tip portion is bent in an arbitrary direction, it is necessary to make the tip rigid portion 1 as short as possible. That is, as shown in FIG. 4, the tip rigid portion 1 has a length of arrow 100, but if the tip rigid portion 1 is long, it is difficult to perform the bending operation of the tip rigid portion 1 in a narrow body cavity. There is a problem such as. Therefore, the shorter the tip rigid portion 1, the better the operability. Further, as shown in FIG. 4, since the CCD package 7, the circuit board 8 and the like are conventionally arranged at the center position of the cylindrical tip rigid portion 1, the observation window 4 is arranged at a position slightly displaced from the center. At the same time, the observation window 4 and the outlet of the treatment instrument insertion channel 10 are arranged at a distance from each other. For this reason, the treatment tool drawn out from the treatment tool insertion channel 10 may not be accurately captured by the observation window 3.

The present invention has been made in view of the above problems, and an object thereof is to shorten the tip hard portion to improve operability, and to dispose the observation window at the center position.
Moreover, it is another object of the present invention to provide an electronic endoscope distal end structure capable of reducing the arrangement interval between the observation window and the treatment instrument insertion channel.

[0006]

In order to achieve the above object, in the electronic endoscope tip portion structure according to the invention described in claim 1, the solid-state image pickup element is in the horizontal direction, that is, the axis of the cylindrical endoscope. At the tip of the electronic endoscope arranged in the direction, the circuit board attached to the back side of the solid-state imaging device is placed on the inner peripheral side of the cylindrical tip rigid portion, and the signal cable is connected to the back side of the circuit board. It is characterized by doing so. A second aspect of the present invention is characterized in that the rear end face of the solid-state image pickup device package and the rear end face of a circuit board attached to the back side of the package are arranged at the same position.

[0007]

According to the above construction, the observation window and the optical system member connected to the observation window are arranged in the vicinity of the center of the cylindrical tip rigid portion,
A solid-state image sensor (CCD package) and a circuit board attached to this optical system member via a prism are arranged near the upper cylinder inner periphery. Then, the signal cable conventionally attached to the front side (solid-state image pickup device side) of the circuit board is connected to the back side. Therefore, the rear end region of the circuit board to which the signal cable is conventionally connected becomes unnecessary, and the length of the rigid portion can be shortened accordingly.
At this time, if the rear end surface of the solid-state imaging device or this package and the rear end surface of the circuit board are aligned at the same position, the rear end surface of the circuit board can be cut to the maximum extent.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of the tip of an electronic endoscope according to an embodiment, and FIG. 1B shows a cross section taken along the line BB of FIG. In the figure, as in the conventional case, the hard tip portion 14 which is a hard portion is connected to the bending portion 2, and the observation window 15 is arranged substantially at the center of the tip surface of the hard tip portion 14. An optical system (lens system) member 4 is connected to the observation window 15 as in the conventional case, and a solid-state image sensor (CC) is connected to the optical system member 4 via a prism 5, a cover glass 6, and the like.
D) is incorporated in the CCD package 16, and the circuit board 1 is provided on the back side of the CCD package 16.
7 is placed. That is, this CCD package 16 (C
CD is also the same) and the circuit board 17 is a cylindrical tip rigid portion 14
Is arranged in the axial direction (horizontal arrangement), and the tip hard portion 14
Is arranged near the inside of the cylinder.

FIG. 2 shows the CCD package 16 and the circuit board 17, and a CCD 18 is wire-bonded to the CCD package 16 as shown in the figure. Further, in the embodiment, the rear end surface S1 of the circuit board 17 is connected to the CCD package 16 and the CCD 18
The length is formed so as to match the position of the rear end surface S2, and the rear side of the circuit board 17 is cut as much as possible.

FIG. 3 shows the back side of the circuit board 17 shown in FIG. 2. A wiring pattern 20 is formed on the circuit board 17, and the wiring pattern 20 is finally provided with a CCD 18 through a through hole. The terminals are connected. Then, the signal cable 9 is connected to the terminal of the wiring pattern 20, and the CC is connected by the signal cable 9.
The video signal from D18 is supplied to an image processing circuit such as an external processor device.

Further, in FIG. 1, a treatment instrument insertion channel 10 is provided in the distal end hard portion 14 and the bending portion 2, and further, as shown in FIG. 1B, a light guide 22,
23 are arranged. Therefore, this light guide 22, 2
The observation light from 3 can be guided to the tip to make the inside of the object to be observed brighter. At this time, the image captured by the CCD 18 is supplied as a video signal to the image processing circuit through the signal cable 9. After that, an image of the inside of the body to be observed is displayed on the monitor based on the image processing signal. While observing the image, a treatment tool such as forceps can be used through the treatment tool insertion channel 10 to perform various treatments. To be done.

According to the above structure, a series of members from the observation window 15 to the circuit board 17 are changed from the conventional state of FIG. 4 to 18.
Since the circuit board 17 is arranged at the inner peripheral position of the cylindrical tip rigid portion 14 by being inverted by 0 degree and the signal cable 9 is connected to the back side of the circuit board 17, the signal cable is connected. The rear end of the conventional circuit board can be cut. In the embodiment, the rear end surface S1 of the circuit board 17 is CC
The rear end portion of the circuit board 17 is cut as much as possible by making the rear end surface S2 of the D18 or the CCD package 16 coincide with each other.
The length could be shortened to the length shown by the arrow 200 in FIG. Further, as shown in FIG. 1B, the observation window 15 is
Since it is arranged at the center position of the distal end surface and is also close to the outlet of the treatment instrument insertion channel 10, the treatment instrument led out from the treatment instrument insertion channel 10 can be easily grasped on the monitor, and the treatment instrument There is an advantage that the operability is further improved.

In the above embodiment, the rear end surface S1 of the circuit board 17 is made to coincide with the rear end surface S2 of the CCD package 16 which is also the rear end surface of the CCD 18.
There is also a type of D18 which is completely housed in the package. In this case, the rear end surface S1 of the circuit board 17 may be aligned with the rear end surface of the package.

[0014]

As described above, according to the first aspect of the present invention, the horizontally arranged solid-state image pickup device and the circuit board thereof are arranged on the inner peripheral side of the cylindrical tip rigid portion. Since the signal cable is connected to the back side of the circuit board, it is possible to cut the rear end part of the circuit board, which used to connect the signal cable in the past, to shorten the hard tip part. The operability of the bending operation will be improved. Further, there is an advantage that the observation window can be arranged at the center position of the distal end surface, and further the arrangement interval between the observation window and the treatment instrument insertion channel can be reduced, so that the inserted state of the treatment instrument and the like can be easily confirmed.

According to the second aspect of the invention, since the rear end surface of the solid-state image pickup device package and the rear end surface of the circuit board attached to the back side of the package are arranged at the same position, the rear end surface of the circuit board is arranged. Is maximally cut, and it is possible to maximize the shortened width of the hard tip portion.

[Brief description of drawings]

1A and 1B are views showing a structure of a distal end portion of an electronic endoscope according to an embodiment of the present invention, FIG. 1A is a side sectional view, and FIG. 1B is a sectional view taken along line BB in FIG. 1A. .

FIG. 2 is a top view of a CCD package and a circuit board according to an embodiment.

FIG. 3 is a bottom view of the CCD package and the circuit board of the embodiment.

4A and 4B are diagrams showing a conventional tip structure, in which FIG. 4A is a side sectional view and FIG. 4B is a sectional view taken along line BB in FIG.

[Explanation of symbols]

 1, 14 ... Tip hard part, 3, 15 ... Observation window, 5 ... Prism, 7, 16 ... CCD package, 8, 17 ... Circuit board, 9 ... Signal cable, 10 ... Treatment tool insertion channel, 18 ... CCD.

Claims (2)

[Claims] 1. A circuit board attached to the back side of the solid-state imaging device at the tip of an electronic endoscope in which the solid-state imaging device is arranged in the horizontal direction is arranged on the inner peripheral side of a cylindrical tip rigid portion, and A structure of a tip portion of an electronic endoscope characterized in that a signal cable is connected to a back side of a circuit board. 2. The electronic endoscope according to claim 1, wherein the rear end surface of the solid-state imaging device package and the rear end surface of a circuit board attached to the back side of the package are arranged at the same position. Tip structure.