JP2006068260A - The tip of the electronic endoscope - Google Patents

Abstract

An electronic endoscope capable of reasonably connecting a signal line drawn from the tip of a signal cable to a connection terminal portion of a circuit board with good workability so as not to be disconnected or leaked. Providing the tip of the.
A circuit board is disposed adjacent to a rear side of a solid-state imaging device incorporated in a distal end portion of an insertion portion, and a plurality of signals are drawn from a signal cable inserted through the insertion portion. The signal line 11 (11a, 11b) of the electronic endoscope connected to the connection terminal portion 13 provided on the circuit board 6 is the rear end portion of the circuit board 6, and the axis 13x is the insertion portion 1. The outer peripheral surface portion was used as the connection terminal portion 13.
[Selection] Figure 1

Description

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

In an electronic endoscope that incorporates a solid-state image sensor at the distal end portion of the insertion portion, a circuit board on which electronic components constituting a drive circuit of the solid-state image sensor are attached is arranged adjacent to the rear side of the solid-state image sensor. A plurality of signal lines drawn from the distal ends of the signal cables inserted and arranged in the insertion portion are connected to connection terminal portions provided on the circuit board (for example, Patent Documents 1 and 2).
JP 2000-199863 A JP-A-9-64273

  In the conventional electronic endoscope as described above, the connection terminal portions are each formed in a planar shape on the two surfaces of the front and back surfaces of the circuit board formed in a flat plate shape, and are pulled out from the front end of the signal cable. A plurality of signal lines are connected and fixed to the connection terminal portions by soldering or the like.

  However, in the distal end portion of the electronic endoscope having such a configuration, a part of the plurality of signal lines is greatly bent from the distal end of the signal cable and connected to the connection terminal portion, so that the connection workability is poor. In some cases, disconnection or leakage between adjacent connection portions may occur.

  In view of this, the present invention provides an electronic internal circuit capable of reasonably connecting a signal line drawn from the tip of a signal cable to a connection terminal portion of a circuit board with good workability so as not to be disconnected or leaked. It aims at providing the front-end | tip part of an endoscope.

  In order to achieve the above object, the distal end portion of the electronic endoscope of the present invention has a circuit board disposed adjacent to the rear side of the solid-state imaging device built in the distal end portion of the insertion portion, and is inserted into the insertion portion. A plurality of signal lines drawn out from the signal cable are connected to the connection terminal portion provided on the circuit board, and the rear end portion of the circuit board is connected to the front end portion of the circuit board. It is formed in a columnar shape or a cylindrical shape in a direction parallel to the axis of the portion, and the outer peripheral surface portion is used as a connection terminal portion.

  In addition, it is good to arrange | position the front-end | tip part of a signal cable in the state in which an axis line is located on the extension line of the axis line of a connection terminal part, and a connection terminal part is inside the outer periphery of the signal cable among several signal lines. The signal lines arranged along the line may be formed to have a diameter that is connected in a state where each of the signal lines is drawn straight out from the signal cable.

  According to the present invention, the rear end portion of the circuit board is formed in a columnar shape or a cylindrical shape in which the axis is parallel to the axis of the distal end portion of the insertion portion, and the outer peripheral surface portion is used as the connection terminal portion. Each signal line pulled out from the tip of the signal cable can be easily bent so that there is no disconnection or leakage with respect to the circuit board connection terminals under a uniform bend angle with little variation and good workability. Can be connected.

  A circuit board is disposed adjacent to the rear side of the solid-state imaging device incorporated in the distal end portion of the insertion portion, and a plurality of signal lines led out from the signal cable inserted and disposed in the insertion portion are provided on the circuit board. At the front end of the electronic endoscope connected to the connection terminal portion, the rear end portion of the circuit board is formed in a columnar shape or a cylindrical shape in which the axis is parallel to the axis of the front end portion of the insertion portion, and its outer periphery Make the surface part the connection terminal.

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. An observation window 3 and an illumination window (not shown) are arranged on the distal end surface of the distal end main body 2 connected to the distal end of the insertion portion 1. ing.

  An objective optical system 4 is disposed in the distal end main body 2 behind the observation window 3. The imaging surface 5 a of the solid-state imaging device 5 is disposed at the subject projection position by the objective optical system 4, and the endoscope observation image is photoelectrically converted by the solid-state imaging device 5.

  A circuit board 6 made of, for example, a ceramic block body is bonded and fixed to the back wall of the solid-state image pickup device 5, and an electronic component 7 such as a capacitor or a transistor constituting the drive circuit of the solid-state image pickup device 5 is connected to the circuit. It is mounted in a recess formed in the middle part of the substrate 6.

  A signal cable 10 for transmitting an imaging signal of an endoscopic observation image captured by the solid-state image sensor 5 is inserted and disposed throughout the insertion portion 1 and extends forward from the distal end of the signal cable 10. The leading ends of the plurality of signal lines 11 are connected and fixed to the connecting terminal portions 13 formed at the rear end portion of the circuit board 6 by soldering or the like.

  Further, as shown in FIG. 1, a plurality of inner leads 8 extend in parallel from the upper side and the lower side of the solid-state imaging device 5, and the extending ends of the inner leads 8 are The lead connection terminal 12 formed on the surface slightly ahead of the rear end of the circuit board 6 is connected and fixed by soldering or the like. Reference numeral 9 denotes an electrically insulating reinforcing plate attached along a plurality of inner leads 8 arranged side by side.

  And the connection part of the inner lead 8 with respect to such a lead connection terminal 12, the inner lead 8 itself, and the recessed part in which the electronic component 7 is arrange | positioned are sealed by sealing resin 15 as FIG. 2 shows. Has been. In FIG. 1, the sealing resin 15 is not shown.

  The rear end portion of the circuit board 6 is formed in a columnar shape or a cylindrical shape whose axis is parallel to the axis of the tip end body 2. And the outer peripheral surface part is the connection terminal part 13, and as shown in FIG. 1, a large number of connection terminal pieces 13a corresponding to the number of signal lines 11 are arranged on the surface of the connection terminal part 13 in parallel. Are arranged in a direction parallel to the axis 13x of the connection terminal portion 13.

  In the signal cable 10, a plurality of outer peripheral signal lines 11 a arranged along the inner periphery of the outer periphery, and a position near the axis 10 x in a state surrounded by the plurality of outer peripheral signal lines 11 a. A plurality of inner signal lines 11b are inserted.

  The distal end portion of such a signal cable 10 is arranged such that the axis 10x is positioned on the extension line of the axis 13x of the connection terminal portion 13, so that each outer peripheral signal line 11a is mutually connected to the connection terminal portion 13. The inner signal lines 11b are also connected at a uniform bending angle with little variation.

  As a result, each signal line 11 is connected to the connection terminal portion 13 without being greatly bent from the tip end of the signal cable 10, so that the connection workability is good, and disconnection or leakage between adjacent connection portions occurs. It can be connected without.

  In addition, if the diameter of the connection terminal portion 13 is formed to a size that allows the plurality of outer peripheral signal lines 11a to be connected in a state where each of the outer peripheral signal lines 11a is straightly drawn out from the signal cable 10, a large number of outer peripheral signal lines 11a are completely formed. Since it can connect to the connection terminal part 13 without bending, a greater effect can be obtained.

It is a perspective view of the state before the connection of the signal cable connection part with respect to the circuit board of the electronic endoscope of the Example of this invention. It is side surface sectional drawing of the front-end | tip part of the insertion part of the electronic endoscope of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 2 Tip part main body (tip part of insertion part)
DESCRIPTION OF SYMBOLS 5 Solid-state image sensor 6 Circuit board 10 Signal cable 10x Axis line 11 Signal line 11a Outer peripheral side signal line 11b Inner signal line 13 Connection terminal part 13a Connection terminal piece 13x Axis line

Claims (3)

A circuit board is disposed adjacent to the rear side of the solid-state imaging device incorporated in the distal end portion of the insertion portion, and a plurality of signal lines led out from the signal cable inserted and disposed in the insertion portion are provided on the circuit board. In the distal end portion of the electronic endoscope connected to the connected terminal portion,
The rear end portion of the circuit board is formed in a columnar shape or a cylindrical shape whose axis is parallel to the axis of the distal end portion of the insertion portion, and the outer peripheral surface portion is the connection terminal portion. The tip of an electronic endoscope.   The distal end portion of the electronic endoscope according to claim 1, wherein the distal end portion of the signal cable is disposed in a state where the axis line is positioned on an extension line of the axial line of the connection terminal portion.   The connection terminal portion is formed to have a diameter to which signal lines arranged along an inner periphery of the signal cable among the plurality of signal lines are connected in a state where each signal line is directly drawn out from the signal cable. The distal end portion of the electronic endoscope according to claim 2.

Images