JP2547412Y2 - Endoscope tip - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a distal end portion of an endoscope, and in particular, around an objective optical system support frame unit of an endoscope provided with a solid-state imaging device in the distal end body. The improvement of the structure.

[Prior Art] In an endoscope provided with a solid-state imaging device in a distal end main body, generally, a metal objective optical system support frame unit that supports an objective optical system and a solid-state imaging device is provided in the distal end main body. Provided. Then, a lens or a cover lens made of parallel flat glass is projected and fixed to the front end portion of the unit,
While surrounding the outer periphery of the protruding portion with electrical insulation means,
The outer peripheral surface of the cover lens is previously colored black with Japanese ink or the like, and is joined to the above-mentioned electric insulating means.

[Problem to be Solved by the Invention] However, Japanese black ink conventionally used for black coloring is a conductor that conducts electricity relatively well. Therefore, the electrical insulation between the surface of the distal end portion of the endoscope and the objective optical system support frame unit becomes insufficient, and there is a disadvantage that the withstand voltage standard cannot be satisfied.

An object of the present invention is to solve such a conventional disadvantage and to provide a distal end portion of an endoscope having good electric insulation.

[Means for Solving the Problems] In order to achieve the above object, the end of the endoscope according to the present invention is a surface of a metal objective optical system support frame unit that supports the objective optical system and the solid-state imaging device. The cover lens of the objective optical system is protruded and attached to the portion, and the outer peripheral portion of the protruding portion is surrounded by electric insulating means, and at the distal end of the endoscope where the cover lens and the electric insulating means are joined, An outer peripheral surface of the cover lens to be joined to the electric insulating means is colored in advance with an electric insulating black paint.

[Operation] The outer peripheral surface of the cover lens of the objective optical system is colored with black paint, thereby preventing reflection and preventing generation of flare and ghost. The black paint is interposed between the end surface of the endoscope and the objective optical frame unit. However, since the black paint is electrically insulating, the surface of the endoscope and the objective optical frame are not electrically insulated. No electrical continuity occurs with the unit.

Example An example will be described with reference to the drawings.

The tip body 1 is made of, for example, a metal part made of stainless steel.
1a and an insulating portion 1b made of an electrically insulating synthetic resin. The insulating portion 1b is adhered and fixed to the metal portion 1a so as to cover the periphery of the metal portion 1a, and the metal portion 1a is not exposed at all on the outer surface of the distal end portion main body 1.

2 is provided continuously behind the distal end portion main body 1,
The bending portion is a bending portion that is bent by remote operation, and the foremost node ring 3 is fitted on the outer periphery of the rear end portion of the distal end portion main body 1 and is connected and fixed by a flathead screw (not shown). The outer surface of the curved portion 2 is covered with a flexible and electrically insulating rubber insulating cover 5 made of rubber. The insulating cover 5 is fixed to the outer periphery of the rear half of the distal end body 1 by bonding. Reference numeral 6 denotes a node ring, and reference numeral 7 denotes a connection shaft that connects the node rings rotatably.

Reference numeral 10 denotes a solid-state imaging device including, for example, a charge-coupled device (CCD), and reference numeral 10a denotes a light receiving unit. Reference numeral 10b denotes a transparent layer made of, for example, a transparent epoxy resin or the like, formed on the surface of the light receiving unit to prevent the attachment of dust or the like, and 10c denotes a filter for cutting the YAG laser. Then, an output signal from the solid-state imaging device 10 is amplified by an electronic circuit formed on the substrate 11 and the code 13
Connected to the monitor device via the rear signal processing circuit (not shown).

On the outer periphery of the solid-state imaging device 10 and the substrate 11, a tape 14 made of, for example, synthetic resin having electrical insulation properties is wound and adhered and fixed in a metal frame 15, and also on the outer periphery of the frame 15. ,
A tape 16 made of, for example, synthetic resin having electrical insulation properties is wound thereon. The frame 15 is fitted into a through hole 17 formed in the metal portion 1a of the distal end body, and is pressed and fixed to the distal end body 1 by a fixing screw (not shown).

The frame body 15 penetrates through the through hole 17 and protrudes forward. The front end of the frame body 15 reaches the inside of the hole 8 formed on the back surface of the insulating portion 1b of the front end body, and the insulating property of the outer periphery is The tape 16 is in contact with the insulating portion 1b, and the frame 15 and the metal portion 1a of the distal end main body.
Are not electrically conducted.

In addition, a silicone resin-based filler 19 is filled in the vicinity of the end of the shielded cable 12 to completely fix and insulate each member in the vicinity.

The frame 15 is grounded via the ground wire of the shielded cable 12 to prevent noise from entering the solid-state imaging device 10. On the other hand, the metal portion 1a of the distal end body is not grounded, and can be electrically connected to the negative side of the high frequency generator when using the high frequency treatment device.

Reference numeral 21 denotes an objective optical system that forms an observation image on the light receiving unit 10a of the solid-state imaging device 10.The objective optical system 21 is adhered and fixed to an endoscope made of a metal lens frame 22. The ends are electrically connected to and fixed to the frame 15.
23 is a spacer, and 24 is a stop of the objective optical system. This aperture
Reference numeral 24 is made of metal, is electrically conductive and fixed to the lens frame 22, and is electrically grounded via the frame 15. Therefore, the stop 24, the spacer 23, and the lens frame 22 play a role in preventing noise from entering the solid-state imaging device 10 from the front.

A cover lens 21a is joined to the front end portion of the lens frame 22 so as to protrude across the stop 24. In the present embodiment, the cover lens 21a is a concave lens and forms a part of the objective optical system. Also, an electric insulation frequency 25 formed in a stepped cylindrical shape with an electrically insulating synthetic resin so as to surround the lens frame 22 is fitted around the front side of the lens frame 22,
Adhesively fixed. The front end of the electrical insulating means 25 projects forward from the lens frame 22, and the cover lens 21a
Are arranged so as to surround the side wall portion. Strictly, the surface of the electric insulating means 25 is disposed so as to be slightly (for example, 0.2 mm) lower than the surface of the cover lens 21a, and the cover lens 21a is fixed to the electric insulating means 25 in a water-tight manner.

For this bonding, a completely defoamed epoxy adhesive is used. Thereby, the withstand voltage performance can be further improved. Then, an adhesive is sufficiently applied to the joint surface side A so as not to cause water leakage. Then, the adhesive flows into the electric insulating means 25, but this is a gap between the lens frame 22 and the electric insulating means 25, and is originally a part joined to each other, so that no inconvenience occurs.

The outer peripheral surface of the cover lens 21a joined to the electric insulating means 25 is previously colored black with an electric insulating black paint 20. Therefore, reflection on the surface is prevented, and arrangement of flares and ghosts is prevented. As the paint, for example, a lacquer-based black paint having no electrical conductivity can be used.

The outer periphery of the electrical insulating means 25 is fitted into a hole 26 formed in the insulating portion 1b of the distal end body. The gap is water-tightly sealed by an electrically insulating O-ring 27 interposed therebetween. Therefore, water does not enter the tip main body 1 from the gap. Therefore, in this portion, the outside and the inside of the distal end portion main body 1 are also electrically insulated well.

In this embodiment, a frame body 15 for fixing the solid-state imaging device 10, a lens frame 22 for fixing the objective optical systems 21 and 21a, and an electric insulating means 25 are integrally fixed to each other by bonding, and the objective An optical system support frame unit is configured. The entire unit is fixed to the distal end body 1 by a fixing screw (not shown),
If the fixing screw is loosened, this unit can be pulled out backward from the distal end body 1 and easily disassembled.

30 is a light guide fiber bundle for illumination to illuminate the observation field of view. Reference numeral 31 denotes an illumination window cover lens including a concave lens for increasing the light distribution angle of the illumination light.

[Effects of the Invention] According to the distal end portion of the endoscope of the present invention, the outer peripheral surface of the cover lens of the objective optical system is colored with an electrically insulating black paint so that the surface of the distal end portion of the endoscope and the objective are covered. Since electrical continuity does not occur with the optical frame unit, it is possible to provide a distal end portion of the endoscope that sufficiently satisfies withstand voltage standards and the like.

[Brief description of the drawings]

The figure is a side sectional view of the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Tip main body, 1b ... Insulation part, 10 ... Solid-state image sensor, 15 ...
Frame body, 20: black paint, 21: objective optical system, 21a: cover lens, 22: lens frame, 25: electric insulation means.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-227129 (JP, A) JP-A-1-156381 (JP, A) JP-A-63-77427 (JP, A) JP-A 61-227 129616 (JP, A) Fully open 63-103601 (JP, U) Fully open 63-188618 (JP, U) Fully open 63-124263 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A cover lens of an objective optical system is protruded and attached to a distal end portion of a metal objective optical system support frame unit that supports the objective optical system and a solid-state imaging device. At the distal end of the endoscope in which the cover lens and the electrical insulating means are joined together while being surrounded by the electrical insulating means, the outer peripheral surface of the cover lens which is joined to the electrical insulating means, A distal end portion of the endoscope, which is previously colored with an electrically insulating black paint.