JP2006051258A - Distal end of electronic endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a distal end of an electronic endoscope allowing the narrowing of the diameter of a signal cable and allowing easy and smooth wiring work for connecting a signal line lead out from the signal cable to a connecting terminal. <P>SOLUTION: This distal end of the electronic endoscope is provided with a plurality of outer circumferential side signal lines 12a disposed along the inside of the outer circumference of the signal cable 11 and a plurality of inside signal lines 12b disposed in positions inward the outer circumferential side signal lines 12a in the signal cable 11, as a plurality of signal lines. The each inside signal line 12b is extended to a clearance in the alignment of the plurality of outer circumferential signal lines 12a at a mutually equal interval and connected to the respective connecting terminals 10 and 10A. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a distal end portion of an electronic endoscope.

In an electronic endoscope, generally, a solid-state imaging device and a circuit board are built in the distal end of an insertion portion, and a plurality of signal lines led out from the distal end of a signal cable inserted through the insertion portion are provided on the circuit board. Are connected to a plurality of connection terminals (for example, Patent Document 1).
JP 2000-209472 A

  In the conventional electronic endoscope described in Patent Document 1 and the like, a plurality of signal lines arranged circumferentially along the inside of the outer periphery of the signal cable are different from each other in 180 ° positions on the circuit board. Are connected approximately half by half to the connection terminals provided in

  However, in such a configuration, the diameter of the signal cable becomes thick and it becomes an obstacle to reducing the diameter of the insertion portion, and the signal lines are entangled when connecting the signal line drawn from the signal cable to the connection terminal. Thus, the wiring work could not be performed smoothly.

  Accordingly, the present invention provides an electronic endoscope in which the diameter of the signal cable can be reduced and the wiring work for connecting the signal line drawn from the signal cable to the connection terminal can be easily and smoothly performed. It aims at providing the front-end | tip part.

  In order to achieve the above object, the distal end portion of the electronic endoscope of the present invention is drawn out from the distal end of a signal cable that has a solid-state imaging device and a circuit board built into the distal end of the insertion portion and is inserted and disposed in the insertion portion. The plurality of signal lines are arranged along the inside of the outer periphery of the signal cable as a plurality of signal lines at the distal end portion of the electronic endoscope connected to the plurality of connection terminals provided on the circuit board. A plurality of outer signal lines and a plurality of inner signal lines arranged at positions closer to the inner side of the signal cable than the outer signal lines are provided, and each inner signal line is separated by a gap in the arrangement of the plurality of outer signal lines. Are extended at equal intervals and connected to the connection terminals.

The number of outer peripheral signal lines may be an integer multiple of the inner signal lines, and the same number of outer peripheral signal lines may be located for each portion between the extending portions of the plurality of inner signal lines. .
The vicinity of the rear end portion of the circuit board may be formed in a rectangular cross-sectional shape, and connection terminals may be provided on each of the four surfaces. In that case, four inner signal lines may be provided and connected one by one to connection terminals provided on the four sides near the rear end of the circuit board, or three inner signal lines may be provided, One connection terminal may be connected to each of the three connection terminals among the connection terminals provided on the four surfaces near the rear end of the circuit board.

  Further, some or all of the connection terminals to which the plurality of inner signal lines are connected may be formed in a groove shape that is recessed with respect to the adjacent connection terminal.

  According to the present invention, as a plurality of signal lines, a plurality of outer peripheral side signal lines arranged along the inner side of the outer periphery of the signal cable, and a plurality of signal lines arranged at positions closer to the inner side of the signal cable than the outer peripheral side signal lines. By providing the inner signal lines, the diameter of the signal cable can be reduced, and each inner signal line can be extended to the gaps in the arrangement of the plurality of outer peripheral signal lines at equal intervals. Thus, the wiring work for connecting the signal line drawn from the signal cable to the connection terminal can be performed easily and smoothly.

  As a plurality of signal lines, a plurality of outer signal lines arranged along the inner periphery of the signal cable and a plurality of inner signal lines arranged at positions closer to the inner side of the signal cable than the outer signal lines. In addition, the inner signal lines are extended to the gaps in the arrangement of the plurality of outer peripheral signal lines at equal intervals, and connected to the connection terminals.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 2 shows the distal end portion of the insertion portion 1 of the electronic endoscope incorporating the solid-state imaging device 5, and an observation window 3 or the like is provided on the distal end surface of the distal end portion main body 2 connected to the distal end of the insertion portion 1. The imaging surface 6 of the solid-state imaging device 5 made of, for example, a CCD (charge coupled device) is arranged at the projection position of the subject by the objective optical system 4 built in the back of the observation window 3.

  In the imaging unit frame 7 that holds the objective optical system 4 and the solid-state imaging device 5, a circuit board 8 to which an electronic component 9 such as a capacitor or an IC chip constituting a driving circuit of the solid-state imaging device 5 is attached is provided. The solid-state image pickup device 5 is fixedly disposed with respect to the solid-state image pickup device 5 adjacent to the rear side of the solid-state image pickup device 5. The circuit board 8 is formed of a block body made of ceramics, for example.

  Reference numeral 11 denotes a signal cable inserted and arranged over the entire length in the insertion portion 1, and a plurality of signal lines 12 a and 12 b led out from the tip of the signal cable are soldered to a plurality of connection terminals 10 provided on the circuit board 8. Each connection is fixed. Reference numeral 13 denotes a lead connected to the circuit board 8 from the solid-state imaging device 5 side.

  FIG. 3 shows a state where the signal cable 11 is cut halfway. In the signal cable 11, a plurality of outer peripheral signal lines 12 a arranged along the inner side of the outer peripheral portion of the signal cable 11, and the outer peripheral signal. A plurality of inner signal lines 12b arranged at positions closer to the inner side of the signal cable 11 than the line 12a are provided. Therefore, the signal lines 12a and 12b can be disposed without waste in the signal cable 11, and the outer diameter of the signal cable 11 can be formed to a minimum thickness.

  FIG. 4 shows a state in which the portion of the circuit board 8 connected to the signal lines 12a and 12b extending from the front end of the signal cable 11 is viewed obliquely from the rear. The circuit board 8 of this embodiment has a rear end portion. The vicinity 8a is formed in a rectangular cross-sectional shape, and connection terminals 10 for connecting the signal lines 12a and 12b are provided on each of the four surfaces.

  FIG. 1 is a cross-sectional view (a cross-sectional view taken along the line II in FIG. 2) illustrating a lead-out portion of the signal lines 12a and 12b connected to the connection terminal 10 of the circuit board 8 from the signal cable 11. .

  The signal cable 11 of this embodiment is provided with four inner signal lines 12b and twice as many as eight outer peripheral signal lines 12a. FIG. Only the inner signal line 12b is hatched. The same applies to FIGS. 5 and 6 described later.

  The four inner signal lines 12b are extended from the inside to every second gap portion of the eight outer peripheral signal lines 12a arranged at equal intervals of 90 ° between each other. The connection terminals 10 and 10A formed on the circuit board 8 are connected. In other words, two outer peripheral signal lines 12a are positioned for each part between the extending portions of the four inner signal lines 12b.

  Each inner signal line 12b is connected and fixed by soldering to connection terminals 10 and 10A formed at the center of each surface of the rear end portion 8a of the circuit board 8 having a rectangular cross-sectional shape, and the inner signal line 12b. The outer peripheral signal lines 12a are connected and fixed to the connection terminals 10 on both sides of the connection terminal 10, respectively.

  With such an arrangement, each inner signal line 12b extends from the gap of the outer peripheral signal line 12a without being bent or entangled with the outer peripheral signal line 12a, and is connected to the connection terminals 10 and 10A. Work can be done easily and smoothly.

  In this embodiment, the two connection terminals 10A at the 180 ° target position among the four connection terminals 10 and 10A to which the four inner signal lines 12b are connected are recessed with respect to the adjacent connection terminal 10. The inner signal line 12b connected to the groove-shaped connection terminal 10A is formed in a groove shape, and since the extension position from the signal cable 11 is inward, the bent state becomes loose and durability is increased. It is excellent in terms of

  The present invention is not limited to the above embodiment. For example, as shown in FIG. 5, a groove-like connection terminal 10A that is recessed with respect to the adjacent connection terminal 10 is connected to all the inner signal lines 12b. It may be provided in the part, whereby durability is further improved.

  In addition, as shown in FIG. 6, three inner signal lines 12b and three outer signal lines 12a, which are three times as many, are arranged in the signal cable 11, and the inner signal lines 12b are placed between each other. Connected to the connecting terminals 10 and 10A formed on the circuit board 8 by extending from the inside to every third gap portion of the nine outer peripheral signal lines 12a arranged at equal intervals of 120 °. You may let them.

  As described above, the present invention is such that each inner signal line 12b is connected to the connection terminals 10 and 10A by extending the inner signal lines 12b into the gaps in the arrangement of the plurality of outer peripheral signal lines 12a at equal intervals. Good.

It is sectional drawing (II sectional drawing in FIG. 2) which shows the signal wire drawing state from the signal cable front-end | tip of the electronic endoscope of 1st Example of this invention. It is side surface sectional drawing of the front-end | tip vicinity of the insertion part of the electronic endoscope of 1st Example of this invention. It is a perspective view of the state where the signal cable of the 1st example of the present invention was cut in the middle. It is the perspective view of the state which looked at the circuit board part to which the signal wire extended from the front-end | tip of the signal cable of 1st Example of this invention was connected from diagonally back. It is sectional drawing which shows the signal wire drawing-out state from the signal cable front-end | tip of the electronic endoscope of 2nd Example of this invention. It is sectional drawing which shows the signal wire drawing state from the signal cable front-end | tip of the electronic endoscope of the 3rd Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 2 Front-end | tip part body 5 Solid-state image sensor 8 Circuit board 8a Rear-end part 10, 10A Connection terminal 11 Signal cable 12a Outer peripheral side signal line 12b Inner signal line

Claims (6)

A solid-state imaging device and a circuit board are built into the distal end of the insertion portion, and a plurality of signal lines led out from the distal end of the signal cable inserted and arranged in the insertion portion are a plurality of connection terminals provided on the circuit board. At the tip of the electronic endoscope connected to
As the plurality of signal lines, a plurality of outer peripheral signal lines arranged along the inner side of the outer peripheral portion of the signal cable, and a plurality of inner sides arranged at positions closer to the inner side of the signal cable than the outer peripheral side signal lines And a signal line, and the inner signal lines are connected to the connection terminals by extending the inner signal lines at equal intervals between the plurality of outer peripheral signal lines. The tip of the endoscope. The outer peripheral signal lines are arranged in integer multiples of the inner signal lines, and the same number of outer peripheral signal lines are located for each portion between the extended portions of the plurality of inner signal lines. The tip part of the electronic endoscope according to claim 1. The distal end portion of the electronic endoscope according to claim 1 or 2, wherein a vicinity of a rear end portion of the circuit board is formed in a rectangular cross-sectional shape, and the connection terminals are respectively provided on four surfaces thereof. 4. The distal end portion of the electronic endoscope according to claim 3, wherein four inner signal lines are provided and connected one by one to connection terminals provided on four surfaces near the rear end of the circuit board. 4. The electronic endoscope according to claim 3, wherein the three inner signal lines are provided and connected one by one to three connection terminals among the connection terminals provided on the four faces near the rear end of the circuit board. The tip of the. The inside of an electronic device according to claim 1, wherein a part or all of a connection terminal to which the plurality of inner signal lines are connected is formed in a groove shape recessed with respect to an adjacent connection terminal. The tip of the endoscope.

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