JPH10216084A - Imaging device for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device in which an installation position of an imaging element can be changed on a single circuit board to apply to different sorts of installation conditions. SOLUTION: Two connection terminals P1, P2 for a duodenum and a stomach, for example, are formed on steps of terminal surfaces 23A, 23B in a circuit board 21. After a conductor lead 18 in a flat rod form is installed on an upper surface of a CCD 17, a cover glass 19 is bound, it is disposed on an aperture 22 of the circuit board 21, and the conductor lead 18 is connected to either of the connection terminals P1, P2. Two sorts of assemblies can thus be obtained by use of the single circuit board 21, and as the terminal surfaces 23A, 23B are formed in steps, a conductor lead of low flexibility formed in a TAB method or the like can be easily connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging device for an endoscope,
In particular, an imaging device configured such that the assembly / arrangement of each member at the distal end portion of the endoscope is different depending on an application site or the like,
The present invention relates to a structure of an imaging device that connects a solid-state imaging device to a hard circuit board.

[0002]

2. Description of the Related Art FIG. 4 shows a side view of a conventional side-viewing type electronic endoscope (tip) for duodenum.
FIG. 5A is a sectional view taken along the line II of FIG.
1 shows a cross-sectional view of the same part of a side-view electronic endoscope for the stomach. 4, an objective optical system 2A, an irradiation window 3A, a stand 5A provided near the forceps port 4A, and the like are arranged on the side surface of the distal end 1A, and the stand 5A is led out from the forceps port 4A. The bending tool is bent in a direction perpendicular to the side surface.

As shown in FIG. 5A, a light guide 6A is optically connected to the irradiation window 3A, and a CCD (solid state image pickup device) is connected to the objective optical system 2A via a prism 7A. A package (also functioning as a circuit board) 9A that houses a Charge Coupled Device (A) 8A is connected. At the distal end of the stomach endoscope shown in FIG. 5B, the left and right arrangements are reversed, and the forceps port 4B and
B is disposed on the right side, the objective optical system 2B, the CCD 8B, the package 9B, etc. are disposed on the left side, and the CCD 8B and the package 9B are provided on the outer peripheral side.

[0004] As described above, the location of the duodenum is different from that of the stomach because the length of the uprights 5A and 5B (the length from the rotation axis to the tip) is ensured to some extent to secure the upright operation. This is because it is necessary to increase the length, and it is easier to perform the treatment if the standing direction of the treatment tool by the standing tables 5A and 5B is changed in relation to the position of the treatment site.

[0005]

However, as described above, since the arrangement positions of the members at the distal ends 1A and 1B are different, the objective optical systems 2A and 2B and the prisms 7A and 7A are different.
B, the mounting positions of the CCDs 8A, 8B and the packages 9A, 9B are different, and there is a problem that different circuit boards (packages 9A, 9B, etc.) must be used for the duodenum and the stomach.

[0008] This will be described with reference to FIGS. 6 and 7 by using an assembled body using an image pickup device that the present applicant has proposed simultaneously with the present invention. In FIGS. 6A and 6B, this imaging element body is firstly TAB (Tape Automated B).
On the upper surface of the CCD 11, a flat bar-shaped conductor lead 12 is attached, and a cover glass (omitted in the figure) is adhered thereon. The TAB method is a mass production method in which products are sequentially assembled on a tape as a carrier and inspection is performed at the same time. After that, the CCD 1
1 is placed in the opening 15 of the circuit boards 14A and 14B, and the conductor leads 12 are connected to the terminals (pads) P to complete the assembly.

According to such a structure, FIG.
As shown in (B), for the duodenum and the stomach, the objective optical systems 2A and 2B and the prisms 7A and 7B are
The CD 11 and the circuit boards 14A and 14B are in a mounted state in which they are rotated by 180 degrees (in the figure, the CCD 11 and the circuit board 14 are arranged in the same direction). That is, FIG. 7 shows a state in which the character F arranged as shown in FIG. 4 is photographed, and the character F is inverted vertically and horizontally by the objective optical system 2 and is specularly reflected by the prism 7. On the CCD 7, an image of the F in the illustrated direction is formed (when viewed from the back side). Therefore, this character F forms an image in the same direction in the arrangement state of FIG. 6, and when viewed from the objective optical systems 2A and 2B side,
The CCD 11 and the circuit board 14A are arranged to be rotated 180 degrees with respect to the prisms 7A and 7B.

Then, as shown in FIG. 6, it is necessary to arrange the prisms 7A and 7B at predetermined positions in the imaging area S indicated by a dotted line, and to dispose the circuit boards 14A and 14B.
The opening 15 of B has a space (room) for arranging the CCD 11 by chucking or the like. Therefore, in this example, as will be understood by comparing FIGS. 6A and 6B, two types of circuit boards 14A and 14B in which the position of the terminal P is slightly shifted in the left-right direction of the drawing are designed. -There is a disadvantage that it has to be manufactured.

The above-mentioned changes in the design and manufacture of the circuit boards 14A and 14B are not limited to the differences between the duodenum and the stomach described above. This also occurs even if the difference is a side-view type.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an image pickup device that can be mounted on a single circuit board at a low cost. It is to provide an endoscope imaging device.

[0011]

In order to achieve the above object, an imaging apparatus for an endoscope according to the first aspect of the present invention comprises a plurality of sets of connection terminals at different positions corresponding to various mounting conditions. Wherein the mounting position of the image sensor on the circuit board can be changed by selecting one of the plurality of sets of connection terminals. The invention according to a second aspect is characterized in that terminal surfaces divided in steps are formed on the circuit board, and different sets of connection terminals are arranged on different divided terminal surfaces.

According to the above configuration, for example, two sets of connection terminals for the duodenum and the stomach are formed on the circuit board, and by using these connection terminals, the image pickup device is connected by a bonding wire or the like. Two types of assembly structures can be obtained. Further, the above two sets of connection terminals can be formed on two divided terminal surfaces formed in a stepped shape, respectively, and one of these divided terminal surfaces can be selected to connect an image pickup device. In this case, not the bonding wire,
There is an advantage that a poorly flexible conductor lead formed on an image sensor by a TAB method or the like is easily connected.

[0013]

1 to 3 show the configuration of an endoscope imaging apparatus according to an embodiment. FIG. 1 shows an assembly of a duodenum (side-view type electronic endoscope). FIG. 3 shows an assembled state for the stomach. In FIG. 1, the objective optical system 2A,
The prism 7A is the same as the conventional one, but the imaging device is manufactured by TAB (Tape Automated Bonding). That is, as shown in the cross-sectional view of FIG.
A flat-plate-shaped conductor lead 18 is formed on the imaging surface (upper surface) side of D17, and a cover glass 19 is adhered so as to sandwich the conductor lead 18 (in a plan view, the cover glass is shown in a transparent state). ). This cover glass 19
Apply an adhesive etc. to the part except the necessary imaging surface and CCD
17, an airtight space is formed between the cover glass 19 and the imaging surface.
Used as CD).

The circuit board 21 also shown in FIG.
An opening (through-hole) 22 for disposing the CCD 17 is formed by using ceramic or the like as a material.
Optical axis direction 1 to insert CCD 17 by chucking etc.
The length in the same direction as 00 (the direction in which no terminals are provided) is CC
It is slightly longer than D17. The circuit board 21 is formed with terminal surfaces 23A and 23B divided into two steps in a stepwise manner, and terminals (groups) P1 and P2 are provided on each of the two terminal surfaces 23A and 23B.

Of course, in the terminals P1 and P2, the same terminals are connected inside the circuit board 21, and signal line connection terminals (not shown) provided on the lower surface or the like.
Wired to connect to For the connection of the signal lines, various structures such as connecting a flexible board to the circuit board 21 and connecting signal lines via the flexible board can be applied.

In the assembly for the duodenum in FIG. 1, a set of terminals P1 formed on the upper terminal surface 23A of the circuit board 21 is used.
As shown in FIG.
Is connected.

On the other hand, in the assembled body for stomach shown in FIG. 3, as shown in FIG.
Of terminals (group) P formed on the lower terminal surface 23B
2 is used, and the conductor lead 18 of the CCD 17 is connected to this terminal P2. In this example, as shown in FIG. 3C, the conductor lead 18 is attached in a slightly bent state by crimping at the time of connection. However, in consideration of the low flexibility of the conductor lead 18, the bottom surface of the CCD 17 is taken into consideration. May be made to protrude from the bottom surface of the circuit board 21, and the conductor leads 18 may be connected straight to the terminal P2.

As described above, in the circuit board 21 of this embodiment, by selectively using the terminals P1 and P2 formed in a step-like manner, it is possible to manufacture both the duodenal and stomach imaging device assembly. . Then, FIG. 1 (A) and FIG. 3 (A)
As shown in FIG. 4, the letter F observed in the same manner as in FIG.
Form an image on the imaging surface of the CCD 17 with the same relationship,
An image whose top, bottom, left, and right coincide is displayed on the monitor.

In the above-described embodiment, the terminals P1 and P2 are formed on the terminal surfaces 23A and 23B divided in steps. However, if the terminals in one set can be sufficiently separated, the steps P1 and P2 may be used. A plurality of terminals (groups) are formed on the same surface without being formed in a shape, and the conductor leads 18 (bonding wires may be used) so as not to contact other groups of terminals that are not used.
May be connected to the corresponding terminal.

Although the connection between the CCD 17 and the circuit board 21 is made by the conductor leads 18 previously attached to the CCD 17, the CCD 17 may be arranged on the circuit board 21 and then connected by wire bonding. Good.

[0021]

As described above, according to the present invention,
A circuit board having a plurality of sets of connection terminals formed at different positions is provided, and any one of the plurality of sets of connection terminals is selected so that the image sensor can be mounted. This makes it possible to manufacture an imaging device corresponding to different types of assembly states such as for duodenum and stomach at low cost.

In the invention according to the second aspect, the connection terminals for each set of the circuit boards are arranged on the step-like divided terminal surface.
Even when connecting conductor leads with low flexibility,
There is an advantage that a good connection state can be obtained.

[Brief description of the drawings]

FIG. 1 shows a configuration of an endoscope imaging apparatus (duodenal side-view type) according to an embodiment of the present invention. FIG. 1 (A) is a plan view showing a state where an imaging element is attached, and FIG. FIG. 1A is a side view, and FIG. 1C is a partial cross-sectional view of the imaging element body and the circuit board of FIG. 1A.

FIG. 2 is a perspective view illustrating a configuration of a circuit board according to the embodiment.

3A and 3B show the configuration of an endoscope imaging apparatus (stomach side view type) according to an embodiment of the present invention, wherein FIG. 3A is a plan view showing a state where an imaging element is mounted, and FIG. Side view of FIG.
FIG. 2C is a partial cross-sectional view of the imaging element body and the circuit board of FIG.

FIG. 4 is a side view showing a configuration of a conventional side-viewing type endoscope distal end portion (for duodenum).

5 is a cross-sectional view taken along the line II in FIG. 4 (FIG. (A)) and a cross-sectional view (FIG. (B)) of the distal end of the stomach taken along the same cutting line.

FIGS. 6A and 6B show two types of assembly states performed using the imaging element body proposed at the same time. FIG. 6A shows an assembly body for duodenum, and FIG. 6B shows an assembly body for stomach. FIG.

FIG. 7 is an explanatory diagram showing the orientation of an image obtained by the configuration of FIG. 4;

[Explanation of symbols]

 2A, 2B ... objective optical system, 8A, 8B, 11, 17 ... CCD, 9A, 9B, 14A, 14B, 21 ... circuit board, 15, 22 ... opening, 12, 18 ... conductor lead, 23A, 23B ... terminal surface , P1, P2 ... terminals.

Claims (2)

[Claims] An image pickup apparatus comprising: a circuit board having a plurality of connection terminals formed at different positions corresponding to various assembling conditions; and selecting one of the plurality of connection terminals to obtain the image. An imaging device for an endoscope, wherein a mounting position of an element on a circuit board can be changed. 2. The endoscope according to claim 1, wherein a terminal surface divided stepwise is formed on the circuit board, and different sets of connection terminals are arranged on different divided terminal surfaces. Imaging device.