JPH08252213A - Endoscopic apparatus - Google Patents

Abstract

PURPOSE: To provide an endoscopic apparatus which has good observation performance without the formation of flares and ghosts by incidence of the light from an illumination optical system into an observation optical system, obviates the vignetting of an observation visual field and illumination light and has a good draining property. CONSTITUTION: A light shielding member 64 is a member separate from a lens cover 52 and is formed of a synthetic resin, such as polycarbonate, polystyrene or polypropylene, of optical opaque black, etc. This light shielding member 64 is joined and fixed into the section between an observation part 60 disposed at the lens cover 52 and the illumination part 61 and the fused part at the time of joining and fixing is positioned to the illumination optical system and objective optical system side, by which the incidence of the illumination light emitted from the illumination optical system 29 on the objective optical system 30 by shielding the reflection in the section of the lens cover 52 and the consequent formation of the flares, etc., are prevented. In addition, the formation of flashes by fusion on the front end side surface of the lens cover is prevented, the vignetting is prevented and the draining property is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope apparatus including an endoscope which is inserted into a body cavity or the like for observation and treatment.

[0002]

2. Description of the Related Art Conventionally, an endoscope apparatus having an endoscope capable of observing a region to be examined and performing various treatments by inserting an elongated insertion portion into a body cavity or the like has been widely used. An objective optical system, an illumination optical system, etc. are provided at the tip of the insertion portion of the endoscope. The observation window located at the forefront of the objective optical system and the illumination window located at the forefront of the illumination optical system are formed by integrally forming the observation window and the illumination window in order to improve the assemblability to the distal end constituent member. It is known that they are arranged in front of the objective optical system and the illumination optical system of the endoscope.

However, as described above, in the case where the observation window and the illumination window are integrally molded with the optical member, the illumination light emitted from the illumination optical system is reflected inside the optical member, so that the objective optical system is formed. The reflected light is incident and causes flare and ghost, which hinders observation.

For this reason, as a technique for preventing flare, a technique in which an observation window and an illumination window are separately formed, and these are joined together with a light-shielding object interposed therebetween to be integrated, is disclosed in JP-B-45-1.
It is disclosed in Japanese Patent No. 7758. In addition, the applicant is
In Japanese Patent Application No. 6-117159, an observation window and an illumination window are formed as an integral lens cover, and a space is provided between a portion corresponding to the observation window portion and a portion corresponding to the illumination window portion, A technique is disclosed in which a fitting portion provided on the tip cover is fitted into this space to prevent flare and ghost from occurring. Further, the applicant discloses in Japanese Patent Application No. 6-117161 that an objective cover lens and an illuminating cover lens are integrally formed, a light shielding groove is provided, and a black treatment is applied to the inner circumference of the light shielding groove. are doing.

[0005]

However, in the one disclosed in the above Japanese Utility Model Publication No. 45-17758,
Not only does the number of parts increase, but it is difficult to automate the process because the adhesive that also serves as a light shield is used to join the glass plates, and a drying process to dry the adhesive is required, which requires assembly time. There was a problem that it would end up.
In addition, when the glass plate is thin, the bonding margin is reduced and the strength of the joint is weakened, or the adhesive does not become smooth and stick to the surface of the glass plate, resulting in poor drainage and water droplets on the surface. The remaining light reflected the illumination light on the water droplets, causing flare and ghost.

On the other hand, in the case where a space is provided between the portion corresponding to the observation window portion and the portion corresponding to the illumination window portion shown in Japanese Patent Application No. 6-117159, the lens cover is washed. At this time, the water accumulated in the space was a cause of flare. Further, the problem of water drainage, in which water applied to the surface of the lens cover remains in the space, has not been solved. Furthermore, since an adhesive was used when fitting the fitting part provided on the tip cover to the space,
There were the same problems as those of Japanese Utility Model Publication No. 45-17758. Also, when the lens cover is thin, the contact area between the fitting part and the space part must be increased in order to obtain a sufficient bonding margin, so the tip cover should be used as the observation lens cover for the tip surface and the illumination lens cover. Area must be widened, and the adhesive margin provided on the tip cover may cause eclipse in the observation field of view range or eclipse in the illumination range. Had to turn into.

Further, in the case where the inner periphery of the light-shielding groove shown in Japanese Patent Application No. 6-117161 is subjected to black treatment, in order to perform the black treatment, a black treatment such as a masking process and a painting process is performed. Since a new process is required, it takes time and cost to change the manufacturing line. Further, since the light shielding groove is configured to be filled with the adhesive, there are the same problems as those described above.

The present invention has been made in view of the above circumstances, and has good observation performance in which light from the illumination optical system does not enter the observation optical system to cause flare and ghost, and the observation field of view and vignetting of illumination light are reduced. It is an object of the present invention to provide an inexpensive endoscopic device having good drainage and strong bonding strength.

[0009]

The endoscope apparatus of the present invention comprises:
A distal end portion of an insertion portion having an illumination optical system that emits illumination light and an observation optical system that takes in an optical image, a lens cover that faces the illumination optical system and the observation optical system, and the lens cover is the illumination optical system. An endoscope apparatus including an endoscope having an illuminating window that faces the observation optical system, and a light-shielding unit provided with an opaque member that optically divides the observation window that faces the observation optical system. The fusion section for connecting the lens cover and the light shielding means is provided on the side where the illumination optical system and the observation optical system are arranged.

[0010]

According to this structure, the fused portion of the lens cover and the light-shielding means is set to the position where the illumination window and the observation window are arranged, and the light from the illumination optical system enters the observation optical system and flares. No ghosts, no observing field of view or vignetting of illumination light, and good drainage.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 15 relate to a first embodiment of the present invention,
FIG. 1 is an explanatory diagram showing a schematic configuration of the entire endoscope apparatus, FIG.
Is a perspective view showing the configuration of the water supply tank, FIG. 3 is a cross-sectional view illustrating a pipe passage insertion portion of the water supply tank, FIG.
FIG. 5 is a cross-sectional view illustrating a state in which a pipe is inserted through a conduit insertion portion, FIG. 6 is an explanatory view showing a tip cover portion and a nozzle member, and FIG. 7 is a front view of a state in which a nozzle member is joined to the tip cover portion. FIG. 8 is a cross-sectional view illustrating the tip cover portion and the nozzle member, FIG. 9 is a cross-sectional view illustrating a state in which the nozzle member is joined to the tip cover portion, and FIG. 10 is a description illustrating a joining portion between the tip cover portion and the nozzle member. FIG. 11 is a sectional view for explaining the positional relationship between the lens cover and the tip of the cover endoscope,
12 is an explanatory view showing a method of welding the light shielding member, FIG. 13 is a view showing one example of the light shielding member, FIG. 14 is a view showing another example of the light shielding member, and FIG. 15 is a welding state of the light shielding member to the lens cover. It is sectional drawing explaining. The endoscope of this embodiment will be described as a cover-type endoscope.

As shown in FIG. 1, the endoscope device comprises a cover-type endoscope 1 and a fluid control device 2 to which the cover-type endoscope 1 is connected. Cover-type endoscope 1
Is composed of a combination of the endoscope cover 3 and the cover endoscope 4 attached to the endoscope cover 3.

When performing an endoscopic inspection, the insertion portion of the cover endoscope 4 and the like are covered with the clean endoscope cover 3, and the endoscope cover 3 is discarded after the inspection. on the other hand,
The endoscope 4 for a cover is covered with a new clean endoscope cover 3 again, and is characterized by being repeatedly used.

The endoscope cover 3 has a flexible insertion section cover section 5, a distal end cover section 6 provided at the distal end of the insertion section cover section 5, and a base provided at the proximal end of the insertion section cover section 5. It is composed of the end component 7.

The tip cover portion 6 is provided with an air supply nozzle 8, a water supply nozzle 9 and a suction port 11. A suction conduit 12 is inserted through the insertion portion cover 5, and the suction conduit 12 communicates with the suction port 11 at the tip end side.
On the proximal end side, the forceps insertion port 1 provided in the proximal end constituent portion 7
3 is connected to and extends from the base end component 7 to the outside. Further, the insertion section cover section 5 has an air supply line 14 and a water supply line 1.
5 is inserted, communicates with the air supply nozzle 8 and the water supply nozzle 9 at the tip end side, and extends to the outside from the base end configuration portion 7. A forceps plug 10 is detachably provided in the forceps insertion port 13 so as to block communication between the forceps insertion port 13 and the atmosphere.

The fluid control device 2 includes a suction control valve 1
6, a suction leak valve 17, an air supply control valve 18, an air supply leak valve 19, and a water supply control valve 20 are provided. These valves are electromagnetic valves of a so-called pinch valve type that open and close the flow path by squeezing the flexible tube by sandwiching a flexible tube through which a fluid forming the suction conduit 12 and the like flows, between the flexible tube and the valve body. There is.

Further, the fluid control device 2 has a control section 21 for controlling the operation of these solenoid valves to perform air supply, water supply and suction operations.
And an air supply pump 22 that sends air to the air supply line 14 or the like,
A light source 23 that supplies illumination light to the cover endoscope 4 is provided.

The cover endoscope 4 includes an elongated insertion portion 2
4 and an operating portion 25 which also serves as a grip portion and which is connected to the base end portion of the insertion portion 24. A universal cord 26 extends from a side portion of the operation portion 25, and a connector 27 is provided at an end portion of the universal cord 26, and the cover endoscope 4 is connected to the fluid control device 2 via the connector 27. It is supposed to be done.

The insertion portion 24 of the endoscope 4 for the cover and the operation portion 2
5. Inside the universal cord 26, the light guide 2
8 is provided, and the illumination light supplied by the light source 23 is guided by the light guide 28 to the distal end portion 5 of the endoscope 4.
Light is guided to an illumination optical system 29 provided in 9 and illuminates an inspected site in a body cavity through a lens cover described later provided in the distal end cover portion 6 of the endoscope cover 3.

An objective optical system 30 is arranged at the tip 59 of the insertion portion 24, and an image pickup device 31 such as a CCD is arranged at the image forming position of the objective optical system 30. An optical image is formed by the objective optical system 30 on the image pickup surface of the image pickup device 31. The formed optical image is photoelectrically converted into an electric signal by the image pickup device 31, and is inputted to a signal processing device 33 such as a video processor provided inside the fluid control device 2 through an image signal line 32. It is converted into a standard video signal and output to the monitor 34 which displays an endoscopic image.

The operation unit 25 is provided with an air / water supply switch 35 for instructing operation of air supply and water supply, and a suction switch 38 for instructing operation of suction. The air / water feeding switch 35 is composed of a two-stage switch. When the air feeding switch 36 is pushed in by one step, the water feeding switch 37 is turned on by pushing in two steps. These switches are controlled by the control unit 21 of the fluid control device 2 via a control signal line 39 arranged in the universal cord 26.
The air supply / water supply switch 35 and the suction switch 38 can be remotely controlled to control air supply, water supply, and suction through the control unit 21.

A pressure switch 40 is provided on the operation unit 25 and is connected to the control unit 21 via a control signal line 39. The cover endoscope 4 is provided with a pressurizing conduit 44 having an opening at a distal end portion 59 inside the insertion portion 24 and the universal cord 26.
It is connected to the pressurization control valve 45 provided in the fluid control device 2 via. This pressurization control valve 45 is used for the air supply pump 2
It is connected to No. 2 and can be opened and closed via the control unit 21 by remote control from the pressure switch 40.

Therefore, when the endoscope cover 3 and the cover endoscope 4 are attached and detached, the air supply control valve 18 and the air supply leak valve 1 are instructed by the pressurizing switch 40 provided in the operation section 25.
9. Close the water supply control valve 20 and open the pressurizing pipe 44,
The attachment / detachment can be easily performed by sending air into the endoscope cover 3 through the air supply pump 22, the pressure control valve 45, and the pressure conduit 44. In this way, the remote operation at the time of attachment / detachment and the remote operation at the time of inspection can all be performed by the operation of the switch provided on the operation unit 25, so that workability is good.

The air supply line 14 is detachably attached to the air supply control valve 18, and the air supply pump 2 is installed more than the air supply control valve 18.
An air supply leak conduit 41 having an opening at one end on the 2 side is branched. The air supply leak 41 is detachably attached to the air supply leak valve 19 on the way to the opening. Further, the air supply line 14 is provided with an air supply pump 22 rather than the air supply control valve 18.
On the side, the open end is branched to the water supply pressurizing pipe line 43 connected to the water supply tank 42, while the base end side is connected to the air supply pump 2
Connected to 2.

The water supply conduit 15 is detachably connected to the water supply control valve 20, and the base end side is connected to the water supply tank 42.

The suction pipe line 12 is detachably connected to the suction control valve 16 and is connected to a suction source 90 via a suction bottle 89. A suction leak pipe line 91 is branched between the suction control valve 16 and the suction bin 89, and the suction leak pipe line 91 is detachably connected to the suction leak valve 17.

The water supply tank 42 will be described with reference to FIGS. 2 and 5. As shown in FIG. 2, the water supply tank 42 is
It is formed by a soft container portion 46 formed of thin and soft vinyl chloride resin or the like and a pipe passage insertion portion 47 formed of an elastomer such as silicon. Sterilized physiological saline or the like is sealed inside the water supply tank.

As shown in FIG. 3, the conduit insertion portion 47 is composed of a thin portion 47a and a thick portion 47b. On the other hand, a pipe portion 50 having a sharp tip is provided at the tip of the water supply conduit 15 and the water supply pressurizing conduit 43. Then, as shown in FIG. 4, the area of the thin portion 47a is set smaller than the outer diameter dimension of the pipe portion 50, while the area of the thick portion 47b is set larger than the outer diameter dimension of the pipe portion 50. It is set.

At the time of inspection, an unused water supply tank 42 is prepared. First, as shown in FIG. 5 (A), the pipe portion 50 having a sharp tip is pressed against the thin wall portion 47a so that the pipe portion 50
Forming an opening smaller than the outer diameter of. Then, FIG.
As shown in (B), the pipe portion 50 is inserted into the flexible container portion while expanding the opening and deforming the thick portion 47b. Then, the water supply conduit 15 and the water supply pressurizing conduit 43 are connected to the water supply tank 42. At this time, due to the elastic force of the thick portion 47b, the conduit insertion portion 47 is formed on the outer periphery of the pipe portion 50.
Are in close contact with each other, so that airtightness between the inside and outside of the water supply tank 42 is ensured. When the sterilized water in the water supply tank is used up, the empty water supply tank 42 is discarded and replaced with a new water supply tank 42. According to this configuration, it is possible to save time and labor for disinfecting the water supply tank 42 and for replacing and injecting water into the water supply tank 42, and since the water in the water supply tank is not contaminated, it is safe.

The configuration of the distal end portion of the cover-type endoscope 1 will be described with reference to FIGS. As shown in FIGS. 6 and 7, the distal end cover portion 6 of the endoscope cover 3 is formed by injection molding a synthetic resin such as polycarbonate, polymethylmethacrylate, polypropylene, or polystyrene.
And, the nozzle member 51 formed of the above-mentioned synthetic resin or the like which constitutes the air supply nozzle 8 and the water supply nozzle 9 is joined to the nozzle joint portion 53 provided at the tip of the tip cover portion 6. There is.

When the nozzle member 51 is joined to the tip cover portion 6 as shown in FIGS. 8 and 9, the nozzle member 51 is
The surface a, the surface b of the tip cover portion 6 and the tip surface of the lens cover 52 are set to be on the same plane with no step. For this reason, when water is supplied toward the lens cover 52, there is no step to which the water drops adhere, so the water drops are easily removed. The reference numeral 64 on the lens cover 52 is a light shielding member described later.

When the tip cover portion 6 is injection molded,
The burr 54 generated by the gate is formed on the nozzle joint 53.
Is left. For this reason, the recess 55 is provided at a position corresponding to the burr 54 of the nozzle member 51 joined to the tip cover portion 6. As a result, as shown in FIG. 8, the burr 54 that was protruding when the tip cover portion 6 and the nozzle member 51 were joined is housed in the recess 55, so that the burr 54 does not damage the inside of the body cavity. It is possible to simplify the process by omitting the work of removing the burr 54 of the tip cover portion 6 during assembly.

The tip cover portion 6 and the nozzle member 51 are joined by ultrasonic welding. As shown in FIG. 10, a protrusion 56 for ultrasonic welding is provided on the joint surface of the nozzle member 51 with the tip cover portion 6. When performing ultrasonic welding, ultrasonic vibration is applied to the protrusion 56 and a portion where the protrusion 56 abuts to perform welding. Therefore, the tip cover portion 6 is fixed to a jig (not shown). And
A horn 57 of the ultrasonic welding machine is brought into contact with the tip side surface of the nozzle member 51, and ultrasonic vibration is applied while pushing the horn 57 toward the tip cover portion side. Then, due to ultrasonic vibration, the protrusion 56 and a portion with which the protrusion 56 abuts are melted and fixed by welding.

The air supply nozzle 8 and the water supply nozzle 9
Has a thin wall thickness of about 0.3 to 0.5 mm for compactness. When the horn 57 comes into contact with the portions of the air supply nozzle 8 and the water supply nozzle 9 which are thinner than this area,
The stress due to ultrasonic vibration is concentrated on this thin portion, and cracks are likely to occur. Therefore, the horn 57 is provided with a nozzle escape portion 58 so as not to come into contact with the portions of the air supply nozzle 8 and the water supply nozzle 9, and is provided directly below the contact surface of the horn 57 with the nozzle member 51. The projections 56 are positioned so as to be located as far as possible from the central axes of the air supply nozzle 8 and the water supply nozzle 9 so that the projections 56 are located, thereby preventing the occurrence of cracks.

As shown in FIG. 11, the lens cover 52 is
It is made of an optically transparent synthetic resin such as polycarbonate, polymethylmethacrylate, polystyrene, polypropylene, etc., and an observation section 60 which is an observation window and an illumination section 61 which is an illumination window are integrally provided.

In the state where the endoscope cover 3 and the cover endoscope 4 are mounted, the observation section 60 is arranged so as to face the tip side of the objective optical system 30 and also faces the tip side of the illumination optical system 29. Then, the illumination unit 61 is arranged. For this reason, it is possible to perform illumination by irradiating the inspection site with illumination light through the single lens cover 52.

A groove portion 62 is provided on the entire outer peripheral portion of the lens cover 52. On the other hand, a protrusion 63 for joining is provided on the outer peripheral portion on the tip side of the tip cover portion 6 so that the groove portion 62 abuts and fits. The groove portion 62 and the joining convex portion 63 are fixed with an adhesive. At this time, the adhesive 49 applied between the groove portion 62 and the joining convex portion 63 may protrude when the groove portion 62 and the joining convex portion 63 are brought into contact with each other.
Is protruding from the contact portion between the tip cover portion 6 and the lens cover 52 to the outer peripheral side surface portion.

Therefore, for example, when blood or mucus in the body cavity adheres to the surface of the lens cover 52, the fluid control device 2 is controlled by the instruction of the air / water feeding switch 35, and the water feeding pump 22 feeds water. When the water in the tank 42 is pressure-fed and jetted onto the surface of the lens cover 52 from the water supply nozzle 9 to wash the lens cover 52, not only is it difficult for water droplets to adhere to the surface, but also water droplets on the lens cover surface. If it is attached, the fluid control device 2 is controlled by the instruction of the air / water feeding switch 35 to eject air from the air feeding nozzle 8 toward the surface of the lens cover 52, and the air is attached to the surface. Water drops are easily removed. In addition, in order to increase the bonding strength between the tip cover portion 6 and the lens cover 52, the adhesive 49 can be intentionally applied to the outer peripheral side surface portion where the groove portion 62 and the joining convex portion 63 come into contact with each other.

On the other hand, as shown in FIGS. 7 and 11, the illumination light emitted from the illumination optical system 29 is reflected on the lens cover 52 within the cross section of the lens cover 52 and is incident on the objective optical system 30. In order to prevent flare and the like from occurring, a light blocking member 64 for blocking the optical path of the illumination light is joined by welding by ultrasonic vibration in the cross section between the observation section 60 and the illumination section 61 provided on the lens cover 52. It is fixed. A space for accommodating the tip portion 59, the suction pipe line 12, the air supply pipe line 14, and the water supply pipe line 15 are provided in the tip cover portion 6.
The shape is complicated because it has a through hole that communicates with the air supply nozzle 8, the water supply nozzle 9, and the suction port 11 and a fixing means (not shown) that fixes the tip portion 59 and the tip cover portion 6 to each other. When the light shielding member 64 is integrally formed on the tip cover portion 6 and the lens cover 52 and the lens cover 52 are ultrasonically welded to each other to form the lens cover 52 in which the light shielding member 64 is disposed, a horn that generates ultrasonic vibration is provided at the tip. When ultrasonic vibration is applied to the cover portion 6, the light-shielding member 64 and the lens cover 52 are complicated because the tip cover portion 6 has a complicated shape.
It was difficult to effectively apply ultrasonic vibrations to cracks, and cracks were more likely to occur in the thin-walled portion compared to the overall thickness. Further, since the contact surface of the horn has a complicated shape, it is difficult to manufacture the horn. on the other hand,
When a horn is applied to the lens cover 52 to apply ultrasonic vibration, the lens cover 52 has a problem that the wall thickness of the lens cover 52 is much smaller than the surface area thereof, and the lens cover 52 is apt to crack. Therefore, in the present embodiment, the light shielding member 64 is a member separate from the tip cover portion 6 and is formed of an optically opaque synthetic resin such as black polycarbonate, polymethylmethacrylate, polystyrene, polypropylene or the like. There is.

As shown in FIG. 12 (A), the lens cover 5
2 is provided with a light blocking hole 65 into which the light blocking member 64 is inserted, and the light blocking member 64 and the lens cover 52 are joined by ultrasonic welding.

As shown in FIG. 13, on the outer periphery of one end of the light shielding member 64, there is provided a projecting portion 66 having a substantially triangular cross section and serving as a melting portion that melts during welding. On the other hand, in the lens cover 52, the edge portion 70 located inside the light shielding hole 65 serves as a melting portion that melts during ultrasonic welding. When the light shielding member 64 is joined to the lens cover 52 by ultrasonic welding, the protrusion 66 provided on the light shielding member 64 is provided inside the lens cover 52 (the positions of the illumination optical system 29 and the objective optical system 30 in FIG. 11). Position). Note that the projection 66 is not limited to a substantially triangular cross-sectional shape as long as it projects approximately 0.1 mm to 0.3 mm in the outer peripheral direction, and has a substantially semicircular shape as shown in FIG. It may have a sectional shape.

When ultrasonically welding the light shielding member 64 to the lens cover 52, first, as shown in FIG. 12A, the light shielding member 64 is attached to the lens cover 5 from the inside of the lens cover 52.
2 is inserted into the light shielding hole 65 provided in 2. The lens cover 52 is fixed to the jig 69 with its inner surface facing the horn 57a of the ultrasonic welding machine. At this time, the peripheral surface of the light shielding hole 65 on the outer surface (front end side) of the lens cover 52 is in contact with the jig 69.

In this state, the horn 57a is pressed against the projection-side end surface of the light shielding member 64, and the light shielding member 64 is pushed toward the lens cover 52 side while applying ultrasonic vibration. Then, the protrusion 66 and the edge portion 70 inside the light shielding hole 65 with which the protrusion 66 comes into contact generate heat and are melted with each other.
The welding is completed as shown in FIG.

A state after the lens cover 52 and the light shielding member 64 have been welded will be described with reference to FIG. As shown in the figure, the gap 71 between the light shielding member 64 and the light shielding hole 65 is filled with the protruding portion 66 and the edge portion 70 by melting. Further, the protrusion 66 and the edge 70 are melted on the inner surface side of the light shielding hole 65 of the lens cover 52, and the transparent resin forming the lens cover 52 and the opaque resin forming the light shielding member 64 are mixed. Then, a semitransparent welding layer 72 is formed. Further, on the inner surface of the lens cover 52, the protrusion 6 of the light shielding member 64 is formed.
6 melts to form an optically opaque weld burr 73.

The spread width c of the welding burr 73 from the light shielding hole 65 toward the observation portion 60 or the illumination portion 61 is 0.
It is about 05 mm to 0.2 mm, and the inward protruding amount d is about 0.05 mm to 0.2 mm. On the other hand, since the outer surface of the lens cover 52 is positioned by the jig 69, the molten resin flowing into the gap 71 between the light shielding member 64 and the light shielding hole 65 does not protrude to the outer surface side, and the lens cover 52 is The light blocking member 64 and the light blocking member 64 form the same flat surface.

Since the projection 66 is provided on the light shielding member 64 as described above, the projection 66 is melted on the inner surface of the lens cover 52 to form an optically opaque weld burr 73, so that the illumination optical system can be used. Even if the illumination light emitted from the system 29 is repeatedly reflected in the cross section of the lens cover 52, the light which is repeatedly reflected by the light blocking member 64 and the welding burr 73 is blocked to prevent the illumination light from entering the objective optical system 30. There is.

Further, since the protrusion 66 of the light shielding member 64 and the edge 70 of the lens cover 52, which are melted by ultrasonic welding, are provided inside the lens cover 52 instead of outside (the tip side), the welding burr 73 generated by the welding. Is not formed on the outer surface of the lens cover 52, the welding burr 73 does not enter the observation visual field range or the illumination range.

On the other hand, since the lens cover 52 and the cover front end portion 6 are bonded and fixed to the outer peripheral side surface portion so that the adhesive flows out, the adhesive agent is not exposed on the front end side surface of the lens cover. It becomes a smooth plane. Even if water drops adhere to the adhesive 49 on the outer peripheral side surfaces of the tip cover portion 6 and the lens cover 52 and cannot be removed, the adhesive 49 is located outside the observation visual field range and the illumination range. The field of view is not narrowed, and flare and poor light distribution due to reflected illumination light on water droplets do not occur.

As described above, since the illumination light emitted from the illumination optical system blocks the incidence of the illumination light on the objective optical system through the section and the plane of the lens cover by the light shielding member and the welding burr, flare is prevented. As a result, it is possible to provide an endoscope device with good observation performance.

Further, not only does the welding burr enter the observation visual field range or the illumination range to narrow the visual field, or the illumination range is narrowed to darken the illumination light quantity, but also flare caused by water droplets attached to the lens cover is eliminated. It is possible to provide an endoscope apparatus which has a high ability to remove water droplets on the surface of a lens cover and a high observation performance, in which the generation and the poor visual field do not occur.

Furthermore, since the joint margin of the front end surface of the lens cover in the planar direction is small, an optically opaque portion can be provided between the observing portion and the illuminating portion even if the light shielding member is made compact. Therefore, it is possible to reduce the diameters of the distal end portion and the distal end cover portion by shortening the intervals between the observation portion and the illumination portion and between the illumination optical system and the objective optical system.

Further, since the light-shielding member is fixed by welding, the drying process for drying the adhesive is not required, and the assembling time can be shortened. Therefore, the assembling can be automated and the mass production can be performed at a low cost. You can

Further, since the lens cover surface is formed in the same flat surface, the water droplets can be easily removed, the observation field range and the illumination range by the water droplets are not narrowed, and the illumination light is reflected on the water droplets. It is possible to inexpensively provide an endoscopic device having good observation performance by preventing flares and ghosts that have occurred. In addition, the adhesive strength is applied to the outer peripheral side surface portion where the groove portion and the joining convex portion come into contact with each other, so that the joining strength between the lens cover and the tip cover portion is increased, and the lens cover falls into the body cavity during the inspection. It is possible to prevent such problems.

Further, since the light shielding member is formed separately from the tip cover portion, the lens cover is fixed to the jig, and the horn is applied to the light shielding member for welding.
The problem that cracks occur in the thin portion can be solved and the light shielding member can be easily joined to the lens cover.

16 to 18 relate to the second embodiment of the present invention. FIG. 16 is an explanatory view showing the structure of a joint portion between a light shielding member and a lens cover, and FIG. 17 is an explanatory view showing ultrasonic welding. Reference numeral 18 is an explanatory view showing a configuration of a lens cover and a tip portion of the cover endoscope. As shown in FIG. 16, the relationship of L1> L2 is established between the thickness L1 of the light shielding member 64 and the thickness L2 of the lens cover 52 of this embodiment. The light shielding member 64 and the lens cover 52 are joined in the same manner as in the first embodiment. At this time, as shown in FIG. 17, since the tip surface side of the light shielding member 64 and the front surface of the lens cover 52 are positioned by the jig 69, the base end side of the light shielding member 64 has a length of L1 -L2. The lens cover 52 is configured to project from the surface of the lens cover 52 on the proximal end side by an amount corresponding to the amount.

At this time, as shown in FIG. 18, when the protrusion amount from the tip surface 77 of the tip portion 59 of the illumination optical system 29 and the objective optical system 30 to the tip side is L3, L3 <L1 -L2
It is set to have a relationship with. Therefore, when the tip portion 59 is fixed by the fixing means (not shown),
The tip end surface 77 of the tip end portion 59 and the base end surface of the light shielding member 64 are fixed in contact with each other. Other configurations are the same as those in the first embodiment, and the same members are designated by the same reference numerals and the description thereof will be omitted.

With the above-described structure, the optically opaque light-shielding member 64 is provided in the space between the lens cover 52 and the tip portion 59 on the tip side of the objective optical system 30 and the tip of the illumination optical system 29. The space on the side is divided. As a result, the illumination light emitted from the illumination optical system 29 is
The light is repeatedly reflected by the inner surface of the lens cover 52 and the front end surface 77, but the light path is blocked by the light shielding member 64 and does not enter the objective optical system 30. Further, since the relationship of L3 <L1-L2 is established, the illumination optical system 29 and the objective optical system 30 do not come into contact with the lens cover 52, so that the illumination optical system 29 and the objective optical system. The breakage of 30 can be prevented.

As described above, since flare due to reflection of illumination light between the inner surface of the lens cover and the distal end surface can be prevented, it is possible to provide an endoscope apparatus having a better observation performance. In addition, it is possible to provide an endoscope apparatus with less failure occurrence. Other functions and effects are similar to those of the first embodiment.

19 to 22 relate to the third embodiment of the present invention. FIG. 19 is a front view of a lens cover integrated tip cover, and FIG. 20 is a lens cover integrated tip cover and a tip portion of a cover endoscope. FIG. 21 is a cross-sectional view illustrating the configuration, FIG. 21 is an explanatory view showing the relationship between the lens cover and the light shielding member, and FIG. 22 is an explanatory view showing a welded state of the lens cover and the light shielding member. The lens cover-integrated front end cover 74 of this embodiment is obtained by injection molding the lens cover 52 and the front end cover portion 6 of the first embodiment with an optically transparent synthetic resin such as polycarbonate, polymethylmethacrylate, polystyrene, polypropylene or the like. It is integrally molded. The lens cover-integrated front end cover 74 is provided with a notch 78 having a dimension deeper than the length of the burr 54 which is generated around the gate where molding is performed. Therefore, the burr 54 after molding does not project to the outer surface of the lens cover-integrated tip cover 74. The lens cover-integrated front end cover 74 has a light-shielding member 6 formed in a substantially concave shape.
A substantially concave light-shielding hole 65 for arranging 4a is formed.

As described above, by forming the notch with a dimension deeper than the length of the burr generated from the gate,
The burr does not damage the inside of the body cavity, and the step for removing the burr can be omitted.

Next, with reference to FIGS. 21 and 22, the joint portion of the light shielding member 64a to the lens cover-integrated front end cover 74 will be described. In this embodiment, the thickness dimension L3 of the light shielding member 64a shown in FIG. 21 and the thickness dimension L4 of the lens cover portion 75 of the lens cover integrated front end cover 74 are set to be substantially the same. For this reason, a melt-out groove portion 76 for receiving the molten material melted out from the light-shielding hole 65 is provided on the inner surface side of the light-shielding hole 65 provided in the lens cover portion 75.

A light shielding member 64a is provided on the lens cover portion 75.
At the time of joining, first, the lens cover-integrated front end cover 74 is fixed to a jig (not shown), and as described in the first embodiment, the horn 57a is brought into contact with the light shielding member 64a to apply ultrasonic vibration to the light shielding member. The protruding portion 66 of 64a and the edge portion 70 in contact with the protruding portion 66 are heated to perform welding.

Then, as shown in FIG. 22, when the welding is completed, the gaps 71 between the lens cover portion 75 and the light shielding member 64a are filled with the protrusions 66 and the edges 70 by melting. Then, the welding layer 72 is formed on the inner surface side of the light shielding hole 65, and the melted portion of the protrusion 66 flows into the melted-out groove portion 76 to be filled. Therefore, the welding burr 73 due to the melted portion of the protrusion 66 does not project to the inner surface side of the lens cover 75.

Therefore, as shown in FIG. 20, when the lens cover-integrated front end cover 74 and the front end portion 59 are integrally formed, the front end surface 77 of the front end portion 59 and the inner side surface of the lens cover portion 75 contact each other. Positioned and fixed in contact.

Thus, by disposing one light-shielding member between the two illuminating sections and one observing section to block the optical path of the illumination light, the number of parts is small and the welding step is performed once. By configuring the lens cover-integrated front end cover in which the lens cover and the front end cover portion are integrally formed, it is possible to provide a more inexpensive endoscope apparatus.

Further, by providing the melt-out groove portion in the lens cover portion, when the light shielding member is welded to the lens cover portion, the welding burr due to the melted portion of the protrusion does not protrude to the inner surface side of the lens cover portion. Therefore, there is no space between the tip surface of the tip and the inner surface of the lens cover, and the illumination light emitted from the illumination optical system is repeatedly reflected in the space between the inner surface of the lens cover and the tip surface. It is possible to eliminate the flare that has been incident on the objective optical system, and there is no fog caused by dew condensation that was generated when the air in the space between the lens cover and the tip surface was cooled when water was sent. It is possible to provide an endoscope device with good observation performance.

Furthermore, since the notch is formed deeper than the length of the burr generated from the gate part, the burr does not damage the inside of the body cavity, and the step for removing the burr becomes unnecessary. Other operations and effects are the same as those of the above-described embodiment, and the same members are denoted by the same reference numerals and the description thereof will be omitted.

23 and 24 relate to the fourth embodiment of the present invention, FIG. 23 is a view for explaining a lens cover and a light-shielding unit-integrated front end cover unit, and FIG. 24 is a front view of FIG. As shown in the drawing, the light-shielding portion 1 is provided on the tip-end side of the endoscope cover 3 with the tip-end cover portion 6 shown in the first embodiment and a light-shielding portion 88 integrally formed with a light-shielding member by injection molding or the like. A body type tip cover portion 85 is provided. On the other hand, the lens cover 52 is provided with a light-shielding hole 65 into which the light-shielding portion 88 provided in the light-shielding portion-integrated front end cover portion 85 is inserted.

The entire circumference of the light shielding hole 65 formed in the lens cover 52 and the entire outer circumference of the lens cover 52 (see FIG. 2).
4), a melting projection 86 that serves as a melting portion that melts during ultrasonic welding is continuously provided. When the lens cover 52 and the light-shielding portion-integrated front end cover portion 85 provided with the melting projection 86 are joined by ultrasonic welding,
By inserting the light shielding portion 88 into the light shielding hole 65 of the lens cover 52, the light shielding portion-integrated front end cover portion 85 and the lens cover 52 are positioned. On the other hand, in the light-shielding portion-integrated front end cover portion 85, the welding surface portion 87, which is provided on the front end side and comes into contact with the melting projection 86, serves as a melting portion that melts during ultrasonic welding.

At the time of welding the lens cover 52 and the light-shielding unit-integrated front end cover unit 85 having the above-described structure,
The light-shielding part integrated tip cover part 85 is fixed to a jig and the horn is pressed against the outer surface of the lens cover 52 to apply ultrasonic vibration to the lens cover 52, and the light-shielding part integrated tip cover part 85 is pushed in. . Then, the fusion protrusion 86 and the welding surface portion 87 of the light-shielding unit-integrated front end cover portion 85, which is in contact with the fusion protrusion 86, generate heat and are melted and welded. This allows the light shielding member, the lens cover, and the tip cover to be joined once. Other configurations and operations are the same as those in the above-described embodiment, and the same members are designated by the same reference numerals and description thereof will be omitted.

As described above, the lens cover having the welding projections on the inner surface side is welded by applying ultrasonic vibration to the light-shielding unit-integrated front end cover portion to bond the light-shielding member, the lens cover and the front end cover. Because you can do it once
It is possible to provide an inexpensive endoscope apparatus. The other effects are similar to those of the above-described embodiment, and the same members are designated by the same reference numerals and the description thereof will be omitted.

25 to 27 relate to a fifth embodiment of the present invention, FIG. 25 is a diagram showing a schematic structure of a side-viewing endoscope, FIG. 26 is a top view of FIG. 25, and FIG. 27 is a longitudinal direction. It is sectional drawing orthogonal. The endoscope of the present embodiment is a so-called side-view type cover-type endoscope apparatus configured such that the observation field of view is lateral to the insertion direction of the endoscope, and as shown in FIG. The objective optical system 30 provided at the distal end portion 59 of the cover endoscope 4 is arranged on the side surface side of the insertion portion 24 orthogonal to the longitudinal direction. The illumination optical system 29 is also arranged to emit illumination light in a direction parallel to the visual field direction so as to illuminate the observation visual field range of the side-view type objective optical system 30. For this reason, the lens cover 52 having the observation section 60 and the illumination section 61 provided at the position facing the objective optical system 30 and the illumination optical system 29 is also provided in the side surface direction orthogonal to the longitudinal direction of the insertion section cover section 5. ing.

As shown in FIG. 26, a nozzle 79 is provided in the vicinity of the base end side of the lens cover 52 of the tip end cover portion 6. The nozzle 79 is a space provided in the tip cover portion 6, and the air supply passage 8 that communicates with the air supply pipe 14 at the base end side.
0, and a water feed pipe 81 that communicates with the water feed pipe 15 at the base end by processing a thin stainless pipe arranged so as to pass through the air feed passage. The air supply pipe 81 is formed integrally with the tip cover part 6 by insert molding when the tip cover part 6 is molded.

As described above, the air supply passage 80 and the water supply pipe 81
By configuring the and
Up to 9 openings are independent. Therefore, the water does not flow back through the air supply passage 80 and the air supply conduit 14 during the water supply, and the water remaining in the air supply passage 80 and the air supply conduit 14 does not spout from the nozzle 79 during the air supply. In addition, the water pipe 8 between the grooves
Since 1 is insert-molded, the compact nozzle 79 can be easily and inexpensively formed.

As shown in FIGS. 25 and 27, a light shielding member 64 is joined to the lens cover 52 by ultrasonic welding as in the first embodiment. Also, the lens cover 5
A groove portion 62 is provided on the entire outer peripheral portion of 2, while a cover joint portion 63 is provided on the outer peripheral portion of the side surface of the tip cover portion 6 facing the lens cover 52. Then, the groove portion 62 and the cover joint portion 63 are brought into contact with each other, and an adhesive is applied between the groove portion 62 and the cover joint portion 63 to fix them by adhesion. An adhesive 49 is applied to the outer peripheral portion of the portion where the groove portion 62 and the cover joint portion 63 are in contact with each other in order to increase the adhesive strength. Other configurations are the same as those of the above-described embodiment, and the same members are designated by the same reference numerals and the description thereof is omitted. The operation and effect are similar to those of the above-mentioned embodiment.

FIG. 28 is a longitudinal sectional view of a cover type endoscope according to a sixth embodiment of the present invention. As shown in the drawing, a curved surface portion 52a is provided at the front end portion of the lens cover 52 of the present embodiment so as to smoothly wrap around from the side surface side to the front end side. A groove portion 62 is provided in the outer peripheral portion on the inner surface side of the lens cover 52, while a cover joint portion 63 is provided in the outer peripheral portion at the position where the side surface side of the tip cover portion 6 and the lens cover 52 on the tip end side face each other. ing. Then, the groove portion 62 and the cover joint portion 63 are brought into contact with each other, and the groove portion 62
An adhesive 49 is applied between the cover and the cover joint portion 63 to be fixed by adhesion. The other structure is the same as that of the fifth embodiment, and the same members are designated by the same reference numerals and the description thereof will be omitted.

As described above, since the curved surface portion is provided at the front end portion of the lens cover so as to wrap around the front end side, even if the adhesive is applied to the outer periphery of the portion where the lens cover and the front end cover portion are in contact with each other, the adhesive is not applied. Since the applied part is far from the nozzle, water droplets caught on the adhesive, which is relatively difficult to remove, will not slip back to the observation part or the illumination part on the outer surface of the lens cover, so the water drop removal performance and observation performance It is possible to provide an endoscope device including a high side-viewing endoscope. Other functions and effects are similar to those of the fifth embodiment.

29 and 30 relate to the seventh embodiment of the present invention, FIG. 29 is a top view of the tip of the cover type endoscope, and FIG. 30 is an explanatory view showing another structure of the lens cover.

As shown in FIG. 29, the tip cover portion 6 of this embodiment is provided with a nozzle-integrated lens cover 82 in which a lens cover portion 75 and a nozzle portion 83 are integrally formed by injection molding or the like as shown in FIG. It is provided.

Similar to the lens cover 52 and the tip cover portion 6 shown in FIG. 27, the groove portion 62 is formed on the outer peripheral portion of the lens cover portion 75 of the nozzle-integrated lens cover 82 of this embodiment.
Is provided. On the other hand, a cover joint portion 63 is provided on the outer peripheral portion of the side surface of the distal end cover portion 6 opposite to the lens cover portion 75. Then, the groove portion 62 and the cover joint portion 63 are brought into contact with each other, and an adhesive is applied between them to bond and fix them. Further, the nozzle portion 83 communicates with the air supply pipe line 14 and the water supply pipe line 15 connected to the base end of the tip cover part 6. Further, a light shielding member 64 is arranged on the nozzle-integrated lens cover 82. Other configurations are the same as those of the above-described embodiment, and the same members are designated by the same reference numerals and the description thereof is omitted.

The nozzle-integrated lens cover 8 in which the nozzle portion 83 and the lens cover portion 75 are integrally formed as described above.
By forming 2, the step is formed between the bottom surface portion 84 of the nozzle portion 83 and the outer surface of the lens cover portion 75, and the protruding portion of the adhesive when the tip end cover portion 6 and the nozzle integrated lens cover 82 are adhered to each other. A smooth surface is formed. In addition, since the nozzle portion 83 is provided in the nozzle-integrated lens cover 82 by dividing the fluid passage near the nozzle, which has a complicated structure, the tip cover portion 6 is provided with the air supply conduit 14 and the water supply conduit 15.
And the flow path of the fluid near the nozzle can be formed in a simple structure.

Since the bottom surface of the nozzle portion and the outer surface of the lens cover portion are made smooth as described above, the air or water flow is not disturbed during air supply or water supply. You can send air and water without dropping. As a result, it is possible to easily remove the water droplets adhering to the outer surface of the lens cover, and it is possible to provide an endoscope apparatus with high removal ability and high observation performance. Moreover, since the structure of the distal end cover is simple, it is possible to provide an inexpensive endoscope apparatus.

It should be noted that the present invention is not limited to the above-described embodiment, and for example, the joining between the lens cover and the tip component is not limited to an adhesive, and ultrasonic welding or heat welding may be used. Good. Alternatively, an ultraviolet curable adhesive that does not require a drying step may be used as the adhesive. Further, in order to join the light-shielding member to the lens cover, the light-shielding member may be provided with a protrusion as a fusion portion or a protrusion as a protrusion on the lens cover. Further, the shapes of the light shielding member and the lens cover and the shape of the fusion portion provided on both members are not limited to those described above. The point is that these members are joined to the lens cover and the light shielding member, so that these observation optical systems Also, it suffices to provide a melting portion for ultrasonic welding on the side where the illumination optical system is located. Further, the endoscope is not limited to the cover-type endoscope in the embodiment, a normal endoscope not covering the cover, a flexible endoscope having a flexible insertion portion, and a rigid endoscope having a flexible insertion portion. It goes without saying that it can be applied to mirrors and the like.

The configuration in this embodiment may be changed without departing from the spirit of the present invention.

[Additional Notes] 1. A distal end portion of an insertion portion having an illumination optical system that emits illumination light and an observation optical system that takes in an optical image, a lens cover that faces the illumination optical system and the observation optical system, and the lens cover is the illumination optical system. An endoscope having an endoscope having an illuminating window opposed to the observation optical system and a light shielding unit provided with an opaque member optically dividing the observation window opposed to the observation optical system, wherein a lens of the endoscope is provided. An endoscope apparatus in which a fusion section for connecting a cover and a light-shielding means is provided on a position side where the illumination optical system and the observation optical system are arranged. As a result, it is possible to provide an endoscope apparatus that has a good observation performance with less flare due to illumination light, does not suffer from vignetting of illumination light, and has good drainability.

2. The endoscope apparatus according to Appendix 1, wherein the fusion zone is a fusion zone for ultrasonic welding.

3. 3. The endoscope apparatus according to appendices 1 and 2, wherein the fusion portion is a protrusion provided on at least one of the lens cover and the light shielding means.

4. The endoscope apparatus according to Appendix 3, wherein the protrusion is provided on the light shielding member.

5. The endoscope apparatus according to appendix 1, wherein the light-shielding member and a distal end constituent member that holds the lens cover are separately formed, and the light-shielding member and the lens cover are joined by ultrasonic welding to be integrated.

6. An endoscope apparatus comprising a cover endoscope and an endoscope cover detachably attached to the cover endoscope, wherein the observation optical system is provided at a tip portion of the cover endoscope. The illumination optical system is provided, and the distal end constituent member that covers the distal end portion of the cover endoscope at the distal end portion of the endoscope cover and has the lens cover is provided. The endoscopic device according to item 5.

7. The endoscope apparatus according to Appendix 3, wherein the cross-sectional shape of the protruding portion is formed into a substantially triangular shape.

8. 4. The endoscope apparatus according to appendix 3, wherein the projecting portion has a substantially semicircular cross section.

9. The protrusion amount of the protrusion is 0.1 mm to 0.
The endoscopic device according to supplementary note 3, supplementary note 7, or supplementary note 8, which is 3 mm.

10. 10. The endoscope apparatus according to any one of appendices 1 to 9, wherein an ultrasonic horn is brought into contact with the surface of the light blocking member on the side where the observation optical system and the illumination optical system are located to join the light blocking member and the lens cover by ultrasonic welding. . As a result, it is possible to provide an endoscope apparatus that can be easily assembled.

11. Note 1 to Note 9 in which an ultrasonic horn is brought into contact with the surface of the lens cover on the observation optical system side to join the light shielding member and the lens cover by ultrasonic welding.
The endoscopic device described.

12. 12. The endoscope apparatus according to supplementary note 1 to supplementary note 11, wherein the light shielding member is formed integrally with the distal end constituting member.

13. 13. The endoscope apparatus according to appendices 1 to 12, wherein the light shielding member is provided so as to project from the lens cover toward a side where the observation optical system and the illumination optical system are located. As a result, it is possible to provide an endoscopic device with good observation performance that can prevent flare due to illumination light.

14. 14. The endoscope apparatus according to supplementary note 1 to supplementary note 13, wherein the light shielding member and the surface of the lens cover on the side where the observation optical system and the illumination optical system are located are formed in substantially the same plane. As a result, it is possible to provide an endoscope apparatus with good observation performance that can prevent clouding of the visual field.

15. 15. The endoscope apparatus according to appendices 1 to 14, wherein the surface of the lens cover on the observation direction side and the surface of the light shielding member on the observation direction side are formed on substantially the same plane. As a result, it is possible to provide an endoscope device having a good drainage property.

16. 3. The endoscope apparatus according to appendices 1 and 2, which has a groove portion near the outer periphery of the fusion portion of the lens cover, in which the fusion portion of the light shielding member melts and flows. As a result, it is possible to provide an endoscope apparatus with good observation performance that does not suffer from observing fields of view and vignetting of illumination light.

17. The endoscope apparatus according to appendix 1, wherein the endoscope is a direct-view type endoscope in which a direction of an optical axis of an observation optical system and a longitudinal direction of the endoscope are substantially the same.

18. The endoscope apparatus according to appendix 1, wherein the endoscope is a side-view endoscope in which a direction of an optical axis of an observation optical system and a longitudinal direction of the endoscope are substantially orthogonal to each other.

19. The endoscope apparatus according to Appendix 1, wherein the endoscope is a flexible endoscope having a flexible insertion portion.

20. The endoscope apparatus according to appendix 1, wherein the endoscope is a rigid endoscope having a rigid insertion portion.

21. A tip portion of an insertion portion having an illumination optical system that emits illumination light and an observation optical system that captures an optical image,
In an endoscope apparatus having a lens cover facing the illumination optical system and the observation optical system, and a tip forming member that holds the lens cover, the lens cover and the tip forming member are joined together at the lens cover. An endoscope apparatus including an endoscope provided on a surface other than the outer surface which is the observation surface of the.

22. 22. The endoscope apparatus according to appendix 21, wherein a joint portion between the distal end constituent member and the lens cover is provided on a surface other than a surface substantially orthogonal to an optical axis of an observation optical system on an outer surface of the lens cover.

23. The endoscope is a cover endoscope,
And an observation optical system and an illumination optical system provided at a tip portion of the cover endoscope, and a tip portion of the endoscope cover. 23. The endoscope apparatus according to supplementary notes 21 and 22, wherein the lens cover and the distal end portion of the endoscope for cover are provided on the exterior and the distal end constituent member for holding the lens cover is provided.

24. 24. The endoscope apparatus according to supplementary note 21 to supplementary note 23, wherein a joint portion between the lens cover and the distal end constituting member is provided on an outer peripheral portion of the lens cover and the distal end constituting member.

25. 25. The endoscope apparatus according to appendix 24, wherein an outer peripheral portion of the lens cover and an outer peripheral portion of the distal end constituent member are provided with contact surfaces for contacting each other, and the contact surfaces are joint portions.

26. The outer peripheral portion of the lens cover and the outer peripheral portion of the tip constituent member are provided with contact surfaces for contacting them.
25. The endoscope apparatus according to appendix 24, wherein an adhesive is applied to the lens cover near the contact surface and the outer peripheral surfaces of the tip constituent member.

27. 26. The endoscope apparatus according to supplementary note 21 to supplementary note 25, wherein the lens cover and the distal end constituent member are bonded by adhesion.

28. 26. The endoscope apparatus according to appendix 21 to 25, wherein the lens cover and the distal end constituent member are joined together by ultrasonic welding.

29. 26. The endoscope apparatus according to appendices 21 to 25, wherein the lens cover and the distal end constituent member are joined by heat welding.

30. 28. The endoscope apparatus according to appendices 26 and 27, wherein an ultraviolet curable adhesive is used as the adhesive for the adhesion.

31. 31. The endoscope apparatus according to appendices 21 to 30, wherein the lens cover constitutes at least one other surface continuous with a surface of the outer surface of the lens cover that is substantially orthogonal to the optical axis of the observation optical system.

32. 32. The endoscope apparatus according to appendices 21 to 31, wherein the lens cover and a nozzle for blowing water and air are integrally formed on the lens cover.

33. 33. The endoscope apparatus according to appendices 21 to 32, which is a direct-viewing endoscope in which the direction of the optical axis of the observation optical system is substantially the same as the axial direction of the insertion portion.

34. 33. The endoscope apparatus according to appendices 21 to 32, which is a side-viewing type endoscope in which an optical axis direction of the observation optical system is substantially orthogonal to an axial direction of the insertion portion.

35. 35. The endoscope apparatus according to supplementary notes 21 to 34, wherein the endoscope has a flexible insertion portion.

36. 35. The endoscope apparatus according to supplementary notes 21 to 34, wherein the endoscope is a rigid endoscope having a rigid insertion portion.

[0121]

As described above, according to the present invention, the light from the illumination optical system is incident on the observation optical system and flare and ghost are not generated, and the observation performance is good, and the observation visual field and the illumination light are not vignetted. It is possible to provide an inexpensive endoscopic device with good drainage and high bonding strength.

[Brief description of drawings]

1 to 15 relate to a first embodiment of the present invention, and FIG. 1 is an explanatory diagram showing a schematic configuration of an entire endoscope apparatus.

FIG. 2 is a perspective view showing the configuration of a water supply tank.

FIG. 3 is a cross-sectional view illustrating a conduit insertion portion of a water tank.

FIG. 4 is a view on arrow A of FIG.

FIG. 5 is a cross-sectional view illustrating a state in which a pipe is inserted into a pipe passage insertion portion.

FIG. 6 is an explanatory view showing a tip cover portion and a nozzle member.

FIG. 7 is a front view showing a state in which a nozzle member is joined to the tip cover portion.

FIG. 8 is a sectional view illustrating a tip cover portion and a nozzle member.

FIG. 9 is a cross-sectional view showing a state in which a nozzle member is joined to the tip cover portion.

FIG. 10 is a cross-sectional view illustrating a joint portion between a tip cover portion and a nozzle member.

FIG. 11 is a cross-sectional view illustrating the positional relationship between the lens cover and the tip of the cover endoscope.

FIG. 12 is an explanatory view showing a welding method of a light shielding member.

FIG. 13 is a diagram showing an example of a light shielding member.

FIG. 14 is a diagram showing another example of the light shielding member.

FIG. 15 is a cross-sectional view illustrating a welding state of a light blocking member to a lens cover.

16 to 18 relate to a second embodiment of the present invention, and FIG. 16 is an explanatory view showing a configuration of a joint portion between a light shielding member and a lens cover.

FIG. 17 is an explanatory view showing a state of ultrasonic welding.

FIG. 18 is an explanatory diagram showing a configuration of a lens cover and a tip portion of the cover endoscope.

19 to 22 relate to a third embodiment of the present invention, and FIG. 19 is a front view of a front end cover integrated with a lens cover.

FIG. 20 is a cross-sectional view illustrating a configuration of a lens cover-integrated distal end cover and a distal end portion of a cover endoscope.

FIG. 21 is an explanatory diagram showing a relationship between a lens cover and a light shielding member.

FIG. 22 is an explanatory view showing a welded state of the lens cover and the light shielding member.

23 and 24 relate to a fourth embodiment of the present invention, and FIG. 23 is a view for explaining a lens cover and a light-shielding unit-integrated front end cover unit.

FIG. 24 is a front view of FIG. 23.

25 to 27 relate to a fifth embodiment of the present invention, and FIG. 25 is a diagram showing a schematic configuration of a side-viewing endoscope.

FIG. 26 is a top view of FIG. 25.

FIG. 27 is a sectional view orthogonal to the longitudinal direction.

FIG. 28 is a longitudinal sectional view of a cover type endoscope according to a sixth embodiment of the present invention.

29 and 30 relate to Embodiment 7 of the present invention, and FIG. 29 is a top view of the tip of a cover-type endoscope.

FIG. 30 is an explanatory diagram showing another configuration of the lens cover.

[Explanation of symbols]

 52 ... Lens cover 64 ... Light-shielding member

Claims (1)

[Claims] 1. A tip of an insertion portion having an illumination optical system for emitting illumination light and an observation optical system for taking in an optical image, a lens cover facing the illumination optical system and the observation optical system, and the lens cover. In an endoscope apparatus provided with an endoscope having an illuminating window facing the illumination optical system and a light shielding means provided with an opaque member for optically dividing the observation window facing the observation optical system, An endoscope apparatus, comprising: a fusion section that connects a lens cover of an endoscope and a light shielding unit is provided on a position side where the illumination optical system and the observation optical system are disposed.