JP2011224277A - Endoscope, distal end adapter for endoscope, and method for manufacturing distal end adapter for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endoscope wherein a transparent resin arranged in an LED serving as a lighting light source is prevented from bronzing and reduction in lighting light quantity is prevented.SOLUTION: The endoscope 2 includes: an insertion part 4 having a distal end 6; a base body 14 continuously arranged to a connection part 20 which can be freely attached/detached to/from the distal end 6; an imaging optical system 15 disposed in the base body 14; a light source 16 disposed in the base body 14 for emitting lighting light; the transparent resin 16d disposed on the light source 16; a cover member 19 fixed to the base body 14 by a low hardness resin adhesive to cover the light source 16 and the transparent resin 16d; a space part 41 formed of the cover member 19 and the base body 14 to be disposed around the light source 16; a passage 19b communicating the space part 41 with the outside; and a sealing member 12 which hermetically seals the passage 19b and is fixed to at least the space part 41 side of the passage 19b via a high hardness resin adhesive.

Description

  The present invention relates to an endoscope, an endoscope tip adapter, and a method for manufacturing an endoscope tip adapter, in which an LED is used as a light source of illumination light.

2. Description of the Related Art In recent years, endoscope apparatuses having a long endoscope insertion portion have been widely used in the medical field and the industrial field.
An endoscope apparatus used in the medical field observes an organ in a body cavity by inserting an elongated insertion portion into a body cavity, or uses a treatment tool inserted into an insertion channel of the treatment tool as necessary. Various treatments can be performed.

  On the other hand, an endoscope apparatus used in the industrial field inserts an insertion portion into boilers, gas turbine engines, automobile engine bodies, piping of various plants, etc. in various factories. Observation and inspection of scratches and corrosion can be performed.

  In addition to the type that transmits illumination light using a conventionally used light guide bundle, an endoscope apparatus uses, for example, an LED as a light source (illuminant) of illumination light as disclosed in Patent Document 1. There are some types. In the LED, a powdery phosphor is mixed with a silicon transparent resin and fixed on the LED chip, and the phosphor may be covered with a silicon transparent resin. The conventional endoscope apparatus disclosed in the cited document 1 is an industrial endoscope apparatus, and has an endoscope distal end adapter that is detachable from the distal end portion of the insertion portion.

JP 2009-291314 A

  However, an endoscope apparatus using an LED as a light source (illuminant) of conventional illumination light has various configurations when used in a high temperature environment in a factory or exposed to high temperature and high pressure steam by autoclave sterilization processing, for example. Aromatic hydrocarbons are generated from the adhesive bonding the parts. Also, aromatic hydrocarbons are generated from the adhesive due to the heat generated by the light emitting LED.

  And in the conventional endoscope apparatus, the aromatic hydrocarbon generated in the silicon transparent resin for fixing the phosphor of the LED and the silicon transparent resin covering the LED chip is taken in, and the high luminous flux energy is obtained in a high temperature environment. There has been a problem of browning due to the low wavelength light (ultraviolet light) peculiar to the LED.

  For this reason, the conventional endoscope apparatus has a risk that the amount of illumination light may be reduced due to browning of the silicon transparent resin, because the amount of illumination light expected from the predetermined light emission luminance of the mounted LED cannot be obtained. It was.

  Therefore, there is provided an endoscope, an endoscope tip adapter, and a method for manufacturing an endoscope tip adapter in which the transparent resin provided in the LED that is the illumination light source is not browned and the illumination light quantity is suppressed from decreasing. It was desired.

  An endoscope according to a first aspect of the present invention is provided in an insertion portion having a distal end portion, a connection portion that is detachably attached to the distal end portion, a base body that is connected to the connection portion, and a base body. An imaging optical system, a light source for emitting illumination light disposed on the base body, a transparent resin disposed on the light source, and a low-hardness resin adhesive having a low hardness when cured on the base body A cover member that is fixed and covers the light source and the transparent resin, a space formed by the cover member and the base body and formed around the light source, and a passage that communicates the space with the outside. The passage is hermetically sealed, and includes at least the space portion side of the passage and a sealing member fixed by a high-hardness resin adhesive having high hardness at the time of curing.

  In addition, an endoscope tip adapter according to a second aspect of the present invention includes a connecting portion that is detachable from a distal end portion of an insertion portion of an endoscope, a base body that is connected to the connecting portion, and a base body. An imaging optical system provided, a light source that emits illumination light disposed on the base body, a transparent resin disposed on the light source, and a low-hardness resin adhesive that has a low hardness when cured to the base body A cover member that is fixed by an agent and covers the light source and the transparent resin, a space portion that is formed by the cover member and the base body, and that is formed around the light source, and communicates the space portion with the outside. A passage, and a sealing member that hermetically seals the passage and is fixed to at least the space portion side of the passage by a high-hardness resin adhesive having high hardness at the time of curing.

  Furthermore, the endoscope tip adapter manufacturing method according to the third aspect of the present invention is connected to the detachable connection portion at the distal end portion of the insertion portion of the endoscope, and is coated with the photographing optical system and the transparent resin. A cover member attached to the base body so as to cover the light source and the transparent resin is fixed to a base body provided with a light source with a low-hardness resin adhesive having a low hardness when cured, and the low-hardness resin adhesion After the curing of the agent, the base body and the cover member are heat-treated using a heating furnace to vaporize aromatic hydrocarbons from the low-hardness resin adhesive, and are formed by the cover member and the base body. The space portion is discharged from a passage communicating with the outside so that aromatic hydrocarbon gas does not stay in the space portion formed around the light source, and at least the space portion side of the passage and the hardness at the time of curing are High high By degrees resin adhesive and hermetically sealed by a sealing member the passage.

  ADVANTAGE OF THE INVENTION According to this invention, it suppresses that the transparent resin provided in LED which is an illumination light source browns, and the endoscope which suppressed that the illumination light quantity declined, the endoscope front-end | tip adapter, and endoscope A method for manufacturing a tip adapter can be provided.

Sectional drawing which shows the structure of the front-end | tip adapter of the state with which the glass plate for illumination of the modification of the figure which shows the structure of the adapter type | mold endoscope apparatus of 1st Embodiment was mounted | worn. The perspective view which shows the structure of the state in which the front-end | tip adapter was mounted | worn with the front-end | tip part of the adapter endoscope similarly Sectional view showing the configuration of the tip adapter An exploded perspective view partially showing a part of the configuration of the tip adapter Same as above, exploded perspective view of tip adapter Sectional drawing which shows the structure of the electrical contact part arrange | positioned at a step part similarly The perspective view of the tip adapter which shows the state before mounting | wearing with the glass plate for illumination similarly Sectional drawing which shows the structure of the front-end | tip adapter of the state with which the glass plate for illumination was equipped with the same Sectional drawing which shows the structure of the front-end | tip adapter of the state with which the glass plate for illumination of the 1st modification was mounted | equipped similarly. Sectional drawing which shows the structure of the front-end | tip adapter of the state with which the glass plate for illumination of the 2nd modification was mounted | mounted Sectional drawing which shows the structure of the front-end | tip adapter of 2nd Embodiment. Sectional view showing the configuration of the tip adapter when assembled Sectional drawing which shows the structure of the tip adapter at the time of the assembly of a modification

  Hereinafter, an adapter type endoscope apparatus constituting the present invention will be described. In the following description, the drawings based on each embodiment are schematic, and the relationship between the thickness and width of each part, the thickness ratio of each part, and the like are different from the actual ones. It should be noted that the drawings may include portions having different dimensional relationships and ratios between the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described with reference to the drawings. In the following description, an embodiment of an industrial endoscope apparatus is illustrated, but it goes without saying that the present invention is naturally applied to various endoscope apparatuses such as a medical endoscope apparatus. Is possible.
1 to 10 relate to a first embodiment of the present invention, FIG. 1 is a diagram showing a configuration of an adapter-type endoscope apparatus, and FIG. 2 is a state in which a tip adapter is attached to a tip portion of the adapter endoscope. 3 is a sectional view showing the configuration of the tip adapter, FIG. 4 is an exploded perspective view partially showing a part of the configuration of the tip adapter, FIG. 5 is an exploded perspective view of the tip adapter, and FIG. Sectional drawing which shows the structure of the electrical contact part arrange | positioned in the step part, FIG. 7 is a perspective view of the front-end | tip adapter which shows the state before mounting | wearing with the glass plate for illumination, FIG. 8 is the state with which the glass plate for illumination was mounted | worn FIG. 9 is a cross-sectional view showing the structure of the tip adapter in a state where the lighting glass plate of the first modification is mounted, and FIG. 10 is a lighting glass of the second modification. It is sectional drawing which shows the structure of the front-end | tip adapter in the state with which the board was mounted | worn.

As shown in FIG. 1, an adapter type endoscope apparatus (hereinafter simply referred to as an endoscope apparatus) 1 is connected to an adapter type endoscope (hereinafter simply referred to as an endoscope) 2 and an endoscope 2. The main part is constituted by the device main body 3 which is an external device. The main part of the endoscope 2 includes a distal end adapter 10, an insertion portion 4, an operation device 5, and a universal cord 9.
The insertion portion 4 is elongated and flexible, and includes a distal end portion 6, a bending portion 7, and a flexible tube portion 8 in order from the distal end side. The distal end portion 6 is rigid, and an endoscope distal end adapter (hereinafter simply referred to as a distal end adapter) 10 is detachably attached. The bending portion 7 is configured such that a plurality of bending pieces are continuously provided therein and bent in, for example, the up / down / left / right directions. The flexible tube portion 8 is formed with flexibility.

  The operating device 5 is connected to the rear end of the flexible tube portion 8 constituting the insertion portion 4. The operating device 5 is provided with a bending operation lever 5a for bending the bending portion 7.

  The universal cord 9 is extended from the operating device 5 and has flexibility. The apparatus main body 3 is provided at an end portion of the universal cord 9 extending from the operation device 5. The apparatus main body 3 is formed in a box shape, for example. Inside the apparatus main body 3 is provided a substrate on which a plurality of electrical components such as a CPU for image processing are fixed, or a battery unit (not shown) for supplying power to LED lighting which is a light emitting element provided in the tip adapter 10. It has been. On the screen of the monitor 3a, an endoscopic image captured by an image sensor provided in the endoscope 2 is displayed.

  In this embodiment, the tip adapter 10 is a monocular direct view type provided with a direct view optical system for observing the distal end side (insertion direction side) of the insertion portion 4 in the longitudinal axis direction. The tip adapter 10 is not limited to the monocular direct-view type, but may be a binocular direct-view type, a monocular side-view type with a side-view optical system, a binocular side-view type, or the like. Further, as shown in FIG. 2, the distal end adapter 10 is configured to be screwed onto the distal end portion 6 of the insertion portion 4.

  Next, the configuration of the tip adapter 10 according to the present embodiment will be described in detail below based on FIGS. 3 to 6.

  As shown in FIGS. 3 to 5, the tip adapter 10 is fixed to the mounting base 14 and a mounting base 14 that is a metal (including metal glass) base body disposed at the tip of the insertion portion 4. An imaging optical system 15, an LED package 16 as a light source, and a flexible substrate (not limited to FPC but may be FCC) 17 (see FIG. 4), an observation glass plate 11 that covers these and serves as an observation window, and A cover member 19 made of metal (including metal glass) to which an illumination glass plate 12 serving as an illumination window is mounted, an attachment base 14, and an attachment sleeve which is a connection portion for fixing the cover member 19 integrally to the insertion portion 4. 20.

  The mounting base 14 has a through hole 21 (see FIG. 3) for mounting the photographing optical system 15, an LED fixing portion 22 (see FIG. 4) for mounting the LED package 16, and a substrate fixing portion 23 for mounting the flexible substrate 17 (FIG. 4). For example). The through hole 21 is provided in a stepped portion 24 formed at a position higher than the LED fixing portion 22 and the substrate fixing portion 23. The stepped portion 24 is provided with power supply terminal portions 30 on both sides of the through hole 21.

  As shown in FIG. 3, the photographing optical system 15 includes a plurality of objective lenses 15a, 15b, and 15c arranged along the photographing optical axis direction, and a cylindrical lens frame 15d that houses these objective lenses 15a to 15c. And. The lens frame 15 d is attached to the mounting base 14 in a positioning state by being fitted into a through hole 21 provided in the mounting base 14.

  The lens frame 15d that accommodates these objective lenses 15a to 15c has a shape that is radially inward at the positions of the subsequent objective lenses 15b and 15c, and the outer diameter at that position is the most advanced objective lens. The outer diameter of 15a is smaller. At this position, the lens frame 15d constitutes an abutting surface 26 that abuts the side surface of the LED package 16.

  Further, as shown in FIG. 4, the state-of-the-art objective lens 15a of the photographing optical system 15 has a cutout (D cut) formed in a circular shape in a part of the circumferential direction. The notch is arranged in phase at a position corresponding to the abutting surface 26.

  The LED package 16 includes a substantially square plate-shaped ceramic substrate 16a that supports an LED chip 16b, which is a light source having a fluorescent portion 16c in which a powdery phosphor is mixed with a transparent resin such as silicon, and a surface thereof. And a substantially hemispherical mold portion 16d made of a transparent resin material such as silicon, which covers the chip 16b together with the fluorescent portion 16c.

  A plurality of electrodes connected to the LED chip 16b are exposed and a heat dissipation pad for heat dissipation is provided on the back surface side of the ceramic substrate 16a opposite to the surface on which the mold portion 16d is disposed. (Both are not shown). When the heat dissipating pad provided on the back surface of the ceramic substrate 16 a is fixed to the mounting base 14, it is joined to the LED fixing portion 22 provided on the mounting base 14. In this state, each electrode provided on the back surface of the ceramic substrate 16 a is arranged to face the substrate fixing portion 23 of the mounting base 14.

  The flexible substrate 17 is formed with an electrode pad 17b on one surface by forming a wiring pattern made of a conductive material on a flexible film-like substrate 17a having high electrical insulation, such as polyimide resin. Has been. The base material 17a may be formed of insulating paper. The flexible substrate 17 is bent and used, and is arranged from the LED fixing portion 22 of the mounting base 14 to the upper surface of the step portion 24.

  In addition, as shown in FIG. 6, the two power feeding terminal portions 30 provided on the stepped portion 24 of the mounting base 14 are fitted into the through holes formed in the mounting base 14. In the insulating tube 31, a power feed pin 32 exposed on the distal end portion 6 side of the insertion portion 4, a metal biasing spring 33, and a power feed pin 34 exposed on the surface side of the stepped portion 24 are disposed. Has been configured.

  Each of the power supply pins 32 and 34 has an outward flange, and the outward flange contacts the inward flange of the insulating tube 31 so as not to be detached from the insulating tube 31. The urging spring 33 electrically energizes each of the power supply pins 32 and 34 and urges each of the power supply pins 32 and 34 in a direction in which the power supply pins 32 and 34 are separated from each other. And protruding from the surface of the stepped portion 24.

  In the power supply terminal portion 30, the power supply pin 34 protruding from the step portion 24 is welded to the electrode pad 17 b of the flexible substrate 17 and the solder 35. Here, an ultraviolet (UV) curable adhesive 36 is applied and cured at the joint between the power supply pin 34 and the electrode pad 17b. The power feed pin 32 is provided at the distal end portion 6 when the distal end adapter 10 is attached to the insertion portion 4 and is electrically connected to an electrical contact portion (not shown).

  The cover member 19 has a cylindrical outer shape and has a substantially concave cross section, and is a first member in which an observation glass plate 11 serving as an observation window is hermetically (watertight) fixed by an adhesive described later. And an illumination glass plate 12 which is a sealing member and serves as an illumination window is hermetically (watertight) fixed by an adhesive, which will be described later, and here is a gas exhaust port communicating with the outside and a gas passage. The 2nd opening part 19b which becomes is formed in the surface used as the front (front-end | tip) side in the front-end | tip adapter 10 (refer FIG. 5). The observation glass plate 11 may not be provided, and the state-of-the-art objective lens 15a of the photographic optical system 15 may be fixed to the first opening 19a as an observation window.

  The cover member 19 has a circular base end surface serving as a rear (base end) surface and a circular joint surface 14a serving as an outward flange in which a step portion is formed inwardly in a middle portion of the mounting base 14 in the front-rear direction. Positioned in contact and in surface contact, the joints are fixed so as to be kept airtight (watertight) by, for example, Ecobond (registered trademark), which is an epoxy resin adhesive that cures in a relatively soft state, for example. . Thus, the cover member 19 is mounted on the mounting base 14 so as to cover the imaging optical system 15, the LED package 16, and the flexible substrate 17 mounted on the mounting base 14.

  As described above, the cover adapter 19 is mounted on the mounting base 14 in a state where the flexible substrate 17 and the LED package 16 are fixed, and the mounting sleeve 20 is further covered, whereby the tip adapter 10 is configured. In the tip adapter 10 thus completed, the female screw 20 a provided on the inner peripheral portion of the mounting sleeve 20 is screwed with a male screw (not shown) provided on the tip portion 6 of the insertion portion 4. Thus, as shown in FIG. 2, the endoscope device 1 according to the present embodiment is configured to be fixed to the distal end portion 6 of the insertion portion 4.

Here, together with the assembly procedure of the tip adapter 10 of the present embodiment, the adhesive for fixing each component will be described in detail below.
First, the photographing optical system 15, the LED package 16, and the flexible substrate 17 are assembled to the mounting base 14. The photographing optical system 15, the LED package 16, and the flexible substrate 17 are fixed to the mounting base 14 with an optical adhesive, an ultraviolet (UV) curable adhesive, Ecobond (registered trademark), or the like, which is a low-hardness resin adhesive. Is done.

  For the cover member 19, the observation glass plate 11 is made of, for example, Ecobond (registered trademark), which is a low-hardness resin adhesive having a low hardness (high viscosity) during curing among epoxy resin adhesives. Is fixed to the first opening 19a so as to be kept airtight (watertight).

  Next, the mounting base 14 on which the photographing optical system 15, the LED package 16, and the flexible substrate 17 are mounted has a low hardness at the time of curing (high viscosity), for example, Ecobond (registered trademark) is applied to the bonding surface 14 a. Is done. Then, as shown in FIG. 7, the cover member 19 is covered and fixed to the attachment base 14 so that the base end surface of the cover member 19 is in surface contact with the joint surface 14 a of the attachment base 14.

  At this time, the first opening 19a of the cover member 19 to which the imaging optical system 15 of the mounting base 14 and the observation glass plate 11 are fixed, and the second LED package 16 and the second of the cover member 19 are mounted. The mounting base 14 and the cover member 19 are positioned so that each of the openings 19b are opposed to each other, and Ecobond (registered trademark) is cured.

  That is, when the tip adapter 10 is assembled, the cover member 19 is attached to the mounting base 14 in a state where the illumination glass plate 12 is not assembled to the second opening 19b of the cover member 19, and these are fixed. The adhesive, here Eco-bond (registered trademark) is cured.

  Thereafter, the unit to which the mounting base 14 and the cover member 19 are fixed is subjected to an outgas process by aging (heat treatment) in a heating furnace. In this aging, aromatic hydrocarbon gas is released from an optical adhesive containing an aromatic compound, an ultraviolet (UV) curable adhesive, Ecobond (registered trademark), or the like.

  This aging is performed using a reduced pressure (vacuum) heating furnace, and the inside of the furnace is reduced to less than 1 atm, for example, 0.2 atm or less, and a predetermined temperature higher than the assumed use temperature of the LED package 16 is set. It is carried out at a temperature for a predetermined time. By performing aging in a state where the pressure in the furnace is reduced as described above, the aromatic hydrocarbon gas filling the space 41 (see FIG. 3) around the LED package 16 formed by the mounting base 14 and the cover member 19 is removed. This is to make it easy to discharge out of the space 41 through the second opening 19b without being retained, and to prevent the aromatic hydrocarbon gas from being taken into the mold portion 16d made of a silicon resin material.

  At the time of the outgassing process by aging, the aromatic hydrocarbon gas is sent around the LED package 16 by sending air by a blower fan or the like that generates an airflow toward the second opening 19b of the cover member 19 during the heat treatment. It may be discharged from the space 41. By using such a fan, it is possible to perform aging using a normal heating furnace instead of a reduced pressure heating furnace. The aging is performed until a predetermined time when the amount of outgas of the aromatic hydrocarbon gas released from the various adhesives becomes a constant amount. Furthermore, this aging increases the number of manufacturing steps, but in order to reliably outgas (exhaust) the aromatic hydrocarbon gas without staying in the space portion 41, each aging of various components, each type of adhesive You may do it.

  And the cover glass 19 of the unit which the outgas process was complete | finished by aging has the glass plate 12 for illumination adhere | attached and fixed to the 2nd opening part 19b. In fixing the lighting glass plate 12 to the second opening 19b of the cover member 19, two types of adhesives 42 and 43 are used as shown in FIGS.

  As a specific example, as shown in FIG. 8, the second opening 19 b of the cover member 19 is provided on the mounting base 14 side, which is the base end side, and is in contact with and held by the lighting glass plate 12. A joint-shaped joint surface portion 19c and a gap forming portion 19d provided on the front surface side which is the tip side and formed stepwise outwardly from the joint surface portion 19c by a predetermined distance from the side surface of the lighting glass plate 12. And have.

  The bonding surface 19c of the second opening 19b is coated with a high-hardness resin adhesive 42 having a higher hardness (low viscosity) than that of Ecobond (registered trademark) among epoxy resin adhesives. After the glass plate 12 is assembled, the high-hardness resin adhesive 42 is cured, and the lighting glass plate 12 is fixed to the cover member 19 in an airtight (watertight) state.

  Next, the groove-shaped gap forming portion 19d formed by fixing the lighting glass plate 12 to the second opening portion 19b has low hardness (high viscosity) among epoxy resin adhesives. For example, a low-hardness resin adhesive 43 that is Ecobond (registered trademark) is filled and applied and cured.

  The high-hardness resin adhesive 42 becomes harder when cured than the low-hardness resin adhesive 43, and the chemical bond of the aromatic compound contained is strong, and the usage environment of the endoscope apparatus 1 and the LED package 16 It is an adhesive having a molecular structure in which aromatic hydrocarbons are not easily vaporized (gasified) from an aromatic compound even under high temperature due to heat generation. On the other hand, the low-hardness resin adhesive 43 is softer even when cured than the high-hardness resin adhesive 42, and the chemical bonds of the aromatic compounds contained are weak. It is an adhesive having a molecular structure in which aromatic hydrocarbons are easily vaporized (gasified) from a group compound.

  Further, as shown in FIG. 9, the gap forming portion 19d is not provided, the joint surface portion 19c is formed, and the high-hardness resin adhesive 42 and the low-hardness resin adhesive 43 are laminated to form the second opening 19b. You may adhere | attach the glass plate 12 for illumination. Furthermore, as shown in FIG. 10, a flat portion 19 e whose surface position coincides with the surface of the lighting glass plate 12 may be formed on the cover member 19 so that the low-hardness resin adhesive 43 is easily fixed.

  As described above, in the present embodiment, the lighting glass plate 12 is fixed to the cover member 19 at the end of the assembly process, but the observation glass plate 11 is also attached to the adhesive 42, at the end of the assembly process. 43 may be fixed to the first opening 19a.

  Thereby, in the outgas process by aging, the two first and second openings 19a and 19b are gas discharge ports communicating with the outside and serve as gas passages, and the aromatic hydrocarbon vaporized in the space 41 Gas can be discharged without stagnation.

  As described above, the tip adapter 10 according to the present embodiment includes an optical adhesive, an ultraviolet (UV) curable adhesive, and an Ecobond (registered trademark) for fixing various components (elements) in advance by aging during manufacture. ), Etc., so that the aromatic hydrocarbon gas is not generated in the space 41 around the LED package 16 surrounded by the mounting base 14 and the cover member 19 even in a high temperature environment. It is composed.

  The tip adapter 10 also discharges the aromatic hydrocarbon gas from the optical adhesive, ultraviolet (UV) curable adhesive, Ecobond (registered trademark), etc. generated during aging from the second opening 19b. The assembling procedure is to attach the lighting glass plate 12 to the second opening 19b after aging.

  The illumination glass plate 12 has the second opening 19b of the cover member 19 and the space 41 side around the LED package 16 surrounded by the mounting base 14 and the cover member 19 in the usage environment of the endoscope apparatus 1. Are bonded by the high-hardness resin adhesive 42 which is less likely to vaporize aromatic hydrocarbons from aromatic compounds even at high temperatures.

  From the above, the tip adapter 10 has an optical adhesive, an ultraviolet (UV) curable adhesive, an Ecobond (registered trademark), and a high hardness in the space 41 even when the endoscope apparatus 1 is used at a high temperature. Aromatic hydrocarbon gas from the resin adhesive 42 is prevented from being generated. For this reason, the mold part 16d made of the silicon resin material of the LED package 16 does not take in the aromatic hydrocarbon gas, and is brown even when receiving high luminous flux energy and low wavelength light (ultraviolet light) peculiar to the LED at a high temperature. It will not become. Thereby, the tip adapter 10 can suppress a decrease in the amount of illumination light emitted from the LED package 16.

  Further, the lighting glass plate 12 is bonded to the second opening 19 b of the cover member 19 by a low-hardness resin adhesive 43 having a low hardness (high viscosity) when cured on the surface side of the cover member 19. This low-hardness resin adhesive 43 has a certain degree of viscosity even when cured, and here, Ecobond (registered trademark) is used. In addition to this, the tip adapter 10 has a certain degree of viscosity even when cured, such as an optical adhesive, an ultraviolet (UV) curable adhesive, an Ecobond (registered trademark), etc., for bonding various components (elements) of the tip adapter 10. By using the adhesive, the occurrence of cracks and cracks due to expansion and contraction of various components (elements) caused by temperature differences is suppressed, and the airtightness (watertightness) and adhesion between various components (elements) are suppressed. The decline is suppressed.

  As described above, the tip adapter 10 that is detachable from the endoscope apparatus 1 according to the present embodiment is mounted on the LED package 16 without browning the mold portion 16d provided on the LED package 16 that is an illumination light source. It is possible to suppress a decrease in the amount of illumination light with respect to the emission luminance.

(Second Embodiment)
Next, the endoscope apparatus 1 according to the second embodiment will be described below based on FIGS. 11 to 13.
11 to 13 relate to the second embodiment of the present invention, FIG. 11 is a sectional view showing the configuration of the tip adapter, FIG. 12 is a sectional view showing the configuration of the tip adapter when assembled, FIG. FIG. 9 is a cross-sectional view showing a configuration of a tip adapter when assembled in a modified example. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals for the sake of convenience of description, and detailed descriptions and operational effects of those components are omitted. The configuration of the present embodiment may be implemented in combination with the configuration of the first embodiment.

  Endoscope tip adapter (hereinafter, simply referred to as tip adapter) 50 of the present embodiment is a side view type. The tip adapter 50 includes an LED package 16 that irradiates illumination light radially outwardly, a reflector member 54 disposed at a position surrounding the periphery of the LED package 16, and the LED package 16 in the longitudinal axis direction. The prism 56 and the objective lens 57 constituting the imaging optical system 55 arranged at the adjacent positions and the base member 64 are fixed.

  The front end portion of the base member 64 is covered with an outer frame member 58 which is a cover member here, and the outer frame member 58 is fixed by a fixing screw 66. The base member 64 and the outer frame member 58 A space 41 is formed around the LED package 16. A mounting sleeve 20 is mounted on the base end portion of the base member 64 so as to be rotatable about the longitudinal axis.

  The outer frame member 58 is formed in a substantially cylindrical cap shape that is inserted along the longitudinal axis direction from the distal end side of the base member 64. The outer frame member 58 includes an opening 60 at a position facing the LED package 16 provided on the base member 64 in a state where the outer frame member 58 is attached to the tip of the base member 64. An illumination glass plate 63 serving as an illumination window is fixed to the opening 60.

  Further, at a position adjacent to the opening 60 in the axial direction of the outer frame member 58, the outer frame member 58 is attached to the prism 56 provided on the base member 64 in a state where the outer frame member 58 is attached to the tip of the base member 64. An observation window 61 that opens to a position that faces is provided. In the observation window 61, the above-described objective lens 59 is disposed so as to be closed in a sealed state.

  The reflector member 54 is formed in an annular shape surrounding the periphery of the LED package 16, and has a reflecting surface 54 a having a tapered inner surface that reflects illumination light emitted from the LED package 16 and directs it to a predetermined observation range. . An annular ring member (closing member) 62 made of aluminum or an aluminum alloy is fitted around the reflector member 54. The ring member 62 is positioned with respect to the reflector member 54 by abutting against a stepped portion 54 b provided around the reflector member 54.

  The base member 64 is formed with a screw hole 64a in which a screw groove into which a fixing screw 66 as a sealing member is screwed is formed, and a through hole 64b that communicates with the screw hole 64a and opens at the tip. The through hole 64 b communicates with a space 41 formed by mounting the outer frame member 58 on the base member 64. That is, the through hole 64b and the screw hole 64a are gas discharge ports that communicate the space 41 with the outside, and constitute a gas passage.

  The tip adapter 50 of this embodiment has a certain degree of viscosity even when it is cured by assembling each component (element), such as an optical adhesive, an ultraviolet (UV) curable adhesive, or Ecobond (registered trademark). After each component (element) is fixed by an adhesive, aging (heat treatment) is performed as in the first embodiment. At this time, as shown in FIG. 12, by performing an outgas process by aging without screwing the fixing screw 66 into the screw hole 64a, an optical adhesive, an ultraviolet (UV) curable adhesive, Ecobond (registered trademark) ) Or the like can be discharged from the screw hole 64a through the through hole 64b communicating with the space portion 41 without staying in the space portion 41. Then, after the aging is completed, a final process at the time of manufacturing, in which the fixing screw 66 is screwed into the screw hole 64a, is performed.

  Note that the fixing screw 66 is applied with the high-hardness resin adhesive 42 of the first embodiment, and is fixed to the screw hole 64a in an airtight (watertight) state. Thereafter, the low-hardness resin adhesive 43 is applied around the fixing screw 66 and the screw hole 64a and cured.

  The configuration of the tip adapter 50 of the present embodiment described above also has the same effect as that of the first embodiment. Therefore, the tip adapter 50 of the present embodiment also suppresses a decrease in the amount of illumination light with respect to the light emission luminance of the mounted LED package 16 without browning the mold portion 16d provided in the LED package 16 that is an illumination light source. Can do.

  In addition, as shown in FIG. 13, the screw hole 58a which is a gas discharge port for discharging | emitting outside the aromatic hydrocarbon gas generated at the time of an outgas process by aging so that it may not retain in the space part 41, and comprises a gas passage. May be provided on the outer frame member 58. The screw hole 58a is screwed with a sealing screw 67 which is a sealing member for holding the space portion 41 in an airtight (watertight) manner. After the high-hardness resin adhesive 42 is applied to the sealing screw 67, The low-hardness resin adhesive 43 is applied around the sealing screw 67 and the screw hole 58a and cured.

  Further, by combining the configuration of the present embodiment with the configuration of the first embodiment described above, the aromatic hydrocarbon gas generated during the outgas process by aging is not retained in the space 41. can do.

  The invention described in each of the above-described embodiments is not limited to the embodiments and modifications, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the described requirements can be deleted if the stated problem can be solved and the stated effect can be obtained. The configuration can be extracted as an invention.

DESCRIPTION OF SYMBOLS 1 ... Adapter-type endoscope apparatus 2 ... Adapter-type endoscope 3 ... Apparatus main body 3a ... Monitor 4 ... Insertion part 4b ... Step part 5 ... Operation apparatus 5a ... Bending operation lever 6 ... Tip part 7 ... Bending part 8 ... Possible Flexible tube portion 9 ... Universal cord 10 ... End adapter 11 for endoscope ... Glass plate for observation 12 ... Glass plate for illumination 14 ... Mounting base 14a ... Joint surface 15 ... Imaging optical systems 15a, 15b, 15c ... Objective lens 15d ... Lens frame 16 LED package 16a Ceramic substrate 16b LED chip 16c Fluorescent part 16d Mold part 17 Flexible substrate 17a Base material 17b Electrode pad 19 Cover member 19a Opening 19b Opening 19c Bonding surface 19d ... Gap forming part 19e ... Plane 20 ... Mounting sleeve 20a ... Female screw 21 ... Through hole 22 ... Fixing part 23 ... Substrate fixing part 24 ... Step part 26 ... Projection Surface 30 ... power supply terminal portion 31 ... insulating tube 32, 34 ... feed pin 33 ... urging spring 35 ... solder 36 ... ultraviolet curing adhesive 41 ... space 42 ... high-hardness resin adhesive 43 ... low hardness resin adhesive

Claims (18)

An insertion section with a tip,
A connection part detachably attached to the tip part;
A base body connected to the connecting portion;
A photographing optical system disposed on the base body;
A light source that emits illumination light disposed on the base body;
A transparent resin disposed on the light source;
A cover member that is fixed to the base body with a low-hardness resin adhesive having a low hardness when cured, and covers the light source and the transparent resin;
A space formed by the cover member and the base body and formed around the light source;
A passage communicating the space with the outside;
A sealing member that hermetically seals the passage, and is fixed by at least the space portion side of the passage and a high-hardness resin adhesive having a high hardness when cured;
An endoscope comprising:   The endoscope according to claim 1, wherein the sealing member is fixed to the outer side of the passage by the low-hardness resin adhesive.   The endoscope according to claim 1, wherein the passage is an opening formed in the cover member. The opening is formed in the cover member facing the light source or the photographing optical system,
The endoscope according to claim 3, wherein the sealing member is an illumination cover member or an observation cover member. The passage is formed in the base body;
The endoscope according to claim 1, wherein the sealing member is a fixing screw that fixes the cover member and the base body.   The endoscope according to claim 1, wherein the sealing member is a sealing screw that seals the opening. A detachable connecting portion at the distal end of the insertion portion of the endoscope;
A base body connected to the connecting portion;
A photographing optical system disposed on the base body;
A light source that emits illumination light disposed on the base body;
A transparent resin disposed on the light source;
A cover member that is fixed to the base body with a low-hardness resin adhesive having a low hardness when cured, and covers the light source and the transparent resin;
A space formed by the cover member and the base body and formed around the light source;
A passage communicating the space with the outside;
A sealing member that hermetically seals the passage, and is fixed by at least the space portion side of the passage and a high-hardness resin adhesive having a high hardness when cured;
An endoscope tip adapter comprising the endoscope.   The endoscope distal end adapter according to claim 7, wherein the sealing member is fixed to the outer side of the passage by the low-hardness resin adhesive.   The endoscope distal end adapter according to claim 7 or 8, wherein the passage is an opening formed in the cover member. The opening is formed in the cover member facing the light source or the photographing optical system,
The endoscope distal-end adapter according to claim 9, wherein the sealing member is an illumination cover member or an observation cover member. The passage is formed in the base body;
The endoscope distal end adapter according to claim 7 or 8, wherein the sealing member is a fixing screw for fixing the cover member and the base body.   The endoscope distal end adapter according to claim 1, wherein the sealing member is a sealing screw for sealing the opening. Covering the light source and the transparent resin on a base body which is connected to a detachable connecting portion at the distal end of the insertion portion of the endoscope and is provided with a photographing optical system and a light source coated with a transparent resin. The cover member attached to the base body is fixed by a low-hardness resin adhesive having a low hardness when cured,
After the low-hardness resin adhesive is cured, the base body and the cover member are heat-treated using a heating furnace to vaporize aromatic hydrocarbons from the low-hardness resin adhesive, the cover member, and the Exhausted from the passage communicating with the outside so that aromatic hydrocarbon gas does not stay in the space formed by the base body and formed around the light source;
The passage is hermetically sealed by a sealing member with a high-hardness resin adhesive having a high hardness at the time of curing and at least the space portion;
A method for producing an endoscope tip adapter, comprising:   14. The method for manufacturing an endoscope tip adapter according to claim 13, wherein the heat treatment is performed by reducing the pressure in the furnace to less than 1 atm.   The aromatic hydrocarbon gas is discharged from the space portion by sending air by a blower fan or the like that generates an airflow toward the passage during the heat treatment. The manufacturing method of the front-end | tip adapter for endoscopes as described in any one of.   The method of manufacturing an endoscope tip adapter according to any one of claims 13 to 15, wherein the heat treatment is performed at a temperature higher than a use temperature of the light source.   17. The heat treatment according to claim 13, wherein the heat treatment is performed until a predetermined time when an outgas amount of the aromatic hydrocarbon gas released from the low-hardness resin adhesive becomes a constant amount. The manufacturing method of the front-end | tip adapter for endoscopes of description.   The endoscope distal end adapter according to any one of claims 13 to 17, wherein the outer side of the passage and the sealing member are fixed by a low-hardness resin adhesive. Production method.

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