JP2019129906A - Endoscope and endoscope apparatus - Google Patents

Abstract

To provide an endoscope capable of preventing a prism from being peeled off from a member for holding it, and an endoscope apparatus equipped with the endoscope.SOLUTION: An endoscope includes: a lens barrel 41 for supporting an objective lens group on which incident light from an observation window provided on a lateral face of the tip part of an insertion part is incident, which has an optical axis intersecting with a longitudinal direction (direction X) of the insertion part; a prism 47 with a light incident surface on which emitted light from the objective lens group is incident; an image pick-up device 50 having an imaging surface parallel to the direction X, which is fastened to the prism 47 in a state that the imaging surface faces a light emission surface of the prism 47; and a prism holder 42 having a body part 42a bonded to the light incident surface and a plate-shaped first contact part 42b that is formed along a lateral surface 47c of the prism 47 and comes in contact with the lateral surface 47c.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an endoscope and an endoscope apparatus.

  In Patent Documents 1-4, a prism is provided at the distal end of the insertion portion, and light incident from an observation window formed on the side surface of the distal end is bent by the prism, whereby the light is converted into the distal end portion of the insertion portion. An endoscope that is configured to guide to an imaging surface of an imaging device mounted on the camera is disclosed.

Japanese Patent Laid-Open No. 08-076028 Japanese Patent Laid-Open No. 10-216084 Japanese Patent Application Laid-Open No. 09-149883 JP, 2006-137231, A

  A side-view type endoscope used for duodenal examination or the like is such that a distal end portion of a wiring cable extending in the longitudinal direction of an insertion portion is fixed to a circuit board, and a light emitting surface of a prism is attached to an image sensor fixed to the circuit board. Is bonded, and a holder for holding the objective optical system is bonded to the light incident surface of the prism, and the holder is supported by the casing at the distal end of the insertion portion. In addition, as exemplified in Patent Documents 1 and 2, the side-view type endoscope is known to have a configuration in which the light incident surface of the prism bonded to the imaging element is parallel to the longitudinal direction of the insertion portion. .

  Since the above-described wiring cable extends to the proximal end portion of the insertion portion, it frequently receives an external force with the operation of the endoscope. This external force acts on the prism via the image sensor and the circuit board, and acts in the direction of peeling the prism from the holder.

  If the light incident surface of the prism, which is the bonding surface between the prism and the holder, is parallel to the longitudinal direction of the insertion section, which is the direction in which the wiring cable extends, the distance between this light incident surface and the wiring cable is the light incident It is not uniform across the entire surface.

  For this reason, the force in the above-described peeling direction increases as the portion is farther from the wiring cable on the light incident surface. Therefore, it is necessary to bond the prism and the holder in consideration of the difference in external force depending on the position of the prism from the wiring cable.

  Patent Documents 1 and 2 describe side-view type endoscopes, but do not specifically describe a bonding method between a prism and an optical member such as an objective lens.

  Patent Document 3 describes a side-view type endoscope using two prisms. However, the light incident surface of the prism bonded to the image sensor is orthogonal to the longitudinal direction of the insertion portion, and the above-described problem does not occur.

  The endoscope described in Patent Document 4 is not a side view type, and the light incident surface of the prism bonded to the imaging element is orthogonal to the longitudinal direction of the insertion portion, and the above-described problem does not occur.

  This invention is made | formed in view of the said situation, and provides an endoscope which can prevent that a prism peels from the member holding it, and an endoscope apparatus provided with this endoscope. Objective.

  The endoscope according to the present invention is an objective having an optical axis that receives incident light from an observation window provided on a side surface of a distal end portion of an insertion portion to be inserted into a subject and intersects the longitudinal direction of the insertion portion. An optical member, a prism on which light emitted from the objective optical member is incident and having a light incident surface facing the output surface of the objective optical member, and an imaging surface parallel to the longitudinal direction of the insertion portion, And an imaging device fixed to the prism in a state where the imaging surface faces the light exit surface of the prism, and a prism holding member that holds the prism by adhering to the light incident surface of the prism, The prism holding member is formed along the side surface of the main body bonded to the light incident surface of the prism and the side surface of the side surface of the prism that is positioned on the front end side in the longitudinal direction of the insertion portion, and contacts the side surface. Plate-shaped first to touch A contact portion, and has a.

  An endoscope apparatus according to the present invention includes a light source device to which the endoscope is connected, and a control device to which the endoscope is connected and which controls the endoscope and the light source device.

  ADVANTAGE OF THE INVENTION According to this invention, an endoscope which can prevent that a prism peels from the member holding it, and an endoscope apparatus provided with this endoscope can be provided.

1 is a diagram illustrating a schematic configuration of an endoscope apparatus 100 according to an embodiment of the present invention. It is a side view of the front-end | tip part 10C of the insertion part 10 of the endoscope 1 shown in FIG. It is a figure which shows the internal structure of the front-end | tip part 10C seen from the direction A shown in FIG. It is a cross-sectional schematic diagram of the BB line along the optical axis of the imaging module 40 shown in FIG. It is a perspective view which shows the structure of the prism holder 42 and the prism 47 which are shown in FIG.3 and FIG.4. It is a figure which shows 40 A of imaging modules which are the 1st modifications of the imaging module 40 shown in FIG. It is a perspective view which shows the structure of the prism holder 42 and the prism 47 of 40 A of imaging modules shown in FIG. It is a figure which shows the imaging module 40B which is the 2nd modification of the imaging module 40 shown in FIG. It is a perspective view which shows the structure of the prism holder 42 and the prism 47 of the imaging module 40B shown in FIG.

  FIG. 1 is a diagram showing a schematic configuration of an endoscope apparatus 100 according to an embodiment of the present invention.

  As shown in FIG. 1, an endoscope apparatus 100 includes an endoscope 1 and a main body unit 2 including a control device 4 and a light source device 5 to which the endoscope 1 is connected.

  Connected to the control device 4 are a display unit 3 for displaying image information and an input unit 6 for receiving an input operation. The control device 4 controls the endoscope 1 and the light source device 5.

  The endoscope 1 is a tubular member extending in a direction X, which is one direction, and is provided in an insertion portion 10 to be inserted into a subject, and a mode switching operation, an imaging operation, and an air supply provided at a proximal end portion of the insertion portion 10. An operation box 11 provided with buttons for performing a water supply operation and a suction operation, an angle knob 12 provided adjacent to the operation box 11, and the endoscope 1 are connected to the light source device 5 and the control device 4, respectively. And a universal cord 13 including connector portions 13A and 13B that are detachably connected. The direction X is the longitudinal direction of the insertion portion 10.

  Although not shown, various channels such as a forceps channel for inserting a treatment tool such as a forceps, a channel for air supply and water supply, a channel for suction, etc. are provided inside the operation box 11 and the insertion portion 10. Is provided.

  The insertion portion 10 includes a flexible portion 10A having flexibility, a bending portion 10B provided at the tip of the soft portion 10A, and a tip portion 10C provided at the tip of the bending portion 10B.

  The bending portion 10 </ b> B is configured to be freely bent by the turning operation of the angle knob 12. The bending portion 10B can be bent in an arbitrary direction and an arbitrary angle in accordance with a portion of the subject in which the endoscope 1 is used, and the tip portion 10C can be directed to a desired observation portion.

  FIG. 2 is a side view of the distal end portion 10C of the insertion portion 10 of the endoscope 1 shown in FIG.

  A treatment tool such as an observation window 101 for taking in light from the site to be observed, an illumination window 102 for emitting illumination light to the site to be observed, and a treatment tool such as forceps is taken in and out of the side surface of the exterior casing 105 of the distal end portion 10C. For example, a forceps port 103 and a storage port for accommodating the stand 104 for raising the treatment tool led out from the forceps port 103 in a direction substantially perpendicular to the side surface of the distal end portion 10C are provided.

  FIG. 3 is a diagram illustrating an internal configuration of the distal end portion 10C viewed from the direction A illustrated in FIG. FIG. 3 shows only the configuration of the imaging module 40 that images the subject through the observation window 101. FIG. 4 is a schematic cross-sectional view taken along line BB along the optical axis of the imaging module 40 shown in FIG. FIG. 5 is a perspective view illustrating the configuration of the prism holder 42 and the prism 47 illustrated in FIGS. 3 and 4.

  As shown in FIG. 3, the imaging module 40 is held by a lens barrel 41 whose tip is fixed to the observation window 101 shown in FIG. 2, a prism holder 42 that constitutes a prism holding member, and a prism holder 42. Prism 47, imaging element 50 fixed to prism 47, and circuit board 60 to which imaging element 50 is fixed.

  As shown in FIG. 4, the lens barrel 41 includes an objective lens including a first lens 43, a second lens 44, a third lens 45, and a fourth lens 46 arranged in order from the observation window 101 side. Support the group. The configuration of the objective lens group is not limited to this, and various other configurations can be employed.

  Incident light from the observation window 101 is incident on the objective lens group. The optical axis K of this objective lens group intersects the direction X. The angle formed by the optical axis K and the direction X is appropriately set according to the site that the endoscope 1 is to be observed, and is, for example, an arbitrary angle between 45 degrees and 135 degrees.

  The objective lens group accommodated in the lens barrel 41 constitutes an objective optical member having an optical axis K that is incident on the incident light from the observation window 101 and intersects the longitudinal direction (direction X) of the insertion portion 10.

  As shown in FIG. 4, the prism 47 receives light emitted from the objective lens group in the lens barrel 41, and the emission surface of the objective lens group (the emission surface 46 a of the fourth lens 46 shown in FIG. 4). ), A light incident surface 47a that is a plane opposite to the light incident surface 47a, an inclined surface 47e that is a plane that reflects light incident on the light incident surface 47a in a direction perpendicular to the optical axis K, and light reflected by the inclined surface 47e. A light emitting surface 47b that is a plane perpendicular to the light incident surface 47a.

  As shown in FIG. 5, the prism 47 further includes a side surface 47 c located on the distal end side in the direction X of the insertion portion 10 and a side surface 47 d located on the proximal end side in the direction X of the insertion portion 10. .

  As shown in FIGS. 3 to 5, the prism holder 42 includes a cylindrical main body portion 42 a fitted to the outer periphery of the lens barrel 41, and an end portion of the main body portion 42 a opposite to the observation window 101 side. A plate-like first abutting portion 42b which extends along the side surface 47c of the prism 47 and abuts on the side surface 47c.

  As shown in FIG. 4, the light incident surface 47 a of the prism 47 closes the opening 42 k of the end surface 42 t opposite to the observation window 101 side of the main body 42 a of the prism holder 42. It is adhered by an adhesive such as a curable resin or a photocurable resin.

  As shown in FIG. 5, the first abutting portion 42 b extends in a direction in which the optical axis K extends from a region outside the region to which the prism 47 is bonded, of the end surface 42 t of the main body 42 a of the prism holder 42. It is a plate-shaped member extended along. The surface of the first contact portion 42b on the prism 47 side is in direct contact with the side surface 47c.

  That is, the position of the side surface 47c in the direction parallel to the light incident surface 47a and the light emitting surface 47b of the prism 47 (the direction perpendicular to the line BB shown in FIG. 3) and the first contact portion 42b in this direction. The positions of the surfaces on the side surface 47c are the same.

  The first abutting portion 42b also functions as a positioning member for positioning the prism 47 when the prism 47 is bonded to the end surface 42t of the main body portion 42a in the manufacturing process of the imaging module 40.

  As shown in FIG. 4, the image sensor 50 includes a sensor unit 51 in which a sensor such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor is formed. A plate-shaped semiconductor substrate 54, a spacer 52 made of a frame-like member formed around the imaging surface 51 a on the surface of the semiconductor substrate 54 on which the imaging surface 51 a of the sensor unit 51 is formed, and on the spacer 52 A flat plate-like translucent member 53 parallel to the formed imaging surface 51a.

  The imaging surface 51 a of the imaging element 50 is parallel to the direction X. The imaging surface 51a being parallel to the direction X means that the angle formed by the direction perpendicular to the imaging surface 51a and the direction X is ideally 90 degrees, but this angle includes a tolerance. It may be.

  The imaging surface 51a and the surface of the translucent member 53 of the imaging element 50 are parallel, and the surface of the translucent member 53 and the light emitting surface 47b of the prism 47 are parallel. The surface of the translucent member 53 and the light emitting surface 47b of the prism 47 are fixed by an adhesive such as a thermosetting resin or a photocurable resin. As described above, the imaging element 50 is fixed to the prism 47 in a state where the imaging surface 51 a faces the light emitting surface 47 b of the prism 47.

  The circuit board 60 is a board on which a circuit electrically connected to a terminal formed on the image sensor 50 is formed. The circuit board 60 and the image sensor 50 are fixed to each other by an adhesive such as a thermosetting resin or a photocurable resin, or solder.

  The circuit formed on the circuit board 60 is provided with a circuit for driving the sensor unit 51, an amplifier for amplifying an imaging signal output from the sensor unit 51, a communication interface component for transmitting the imaging signal, and the like. Yes.

  As shown in FIG. 3, a wiring cable 70 that holds various wirings electrically connected to the terminals of the circuit formed on the circuit board 60 is fixed to the circuit board 60.

  The wiring cable 70 has a distal end portion (an end portion on the distal end side of the insertion portion 10) in a region FX that is closer to the proximal end side of the insertion portion 10 in the direction X than the side surface 47 d of the prism 47 in the circuit board 60. The circuit board 60 is fixed. The area FX is a fixed portion between the circuit board 60 and the wiring cable 70.

  The circuit board 60 and the wiring cable 70 are not limited to an adhesive, and may be fixed by covering and surrounding them with an epoxy resin or the like. The wiring cable 70 extends to the inside of the universal cord 13 shown in FIG.

  In the endoscope 1 configured as described above, when a force is applied to the wiring cable 70 in the vertical direction in FIG. 3, a force in the rotation direction about the region FX is applied to the imaging module 40. The force in the rotational direction increases as the distance from the region FX in the light incident surface 47a of the prism 47 increases.

  In the imaging module 40 of the endoscope 1, the first contact portion 42b of the prism holder 42 is in contact with the side surface 47c of the prism 47 near the portion where the force in the rotational direction is large. For this reason, even if a rotational force is applied to the prism 47 in the vicinity of the side surface 47c, this force can be received by the first contact portion 42b. Therefore, the prism 47 can be prevented from peeling off from the end surface 42t of the prism holder 42.

  It should be noted that the force in the rotational direction becomes relatively small at a portion close to the side surface 47d of the prism 47. For this reason, it is possible to sufficiently prevent the prism 47 from being peeled off from the end surface 42t of the prism holder 42 only by the adhesive force between the light incident surface 47a and the end surface 42t.

  Thus, according to the endoscope 1, the holding performance of the prism 47 by the prism holder 42 can be sufficiently obtained, and the reliability of the product can be improved. Further, since the first contact portion 42b can be used as a member for positioning the prism 47, it is not necessary to provide other means for positioning, and the manufacturing cost can be reduced.

  In the above description, the first abutting portion 42b is in direct contact with the side surface 47c so that the first abutting portion 42b is in contact with the side surface 47c. However, the present invention is not limited to this. For example, the first contact portion 42b may be in contact with the side surface 47c by interposing an adhesive between the first contact portion 42b and the side surface 47c and bonding them together.

  In this case, the position of the side surface 47c in the direction parallel to the light incident surface 47a and the light output surface 47b of the prism 47 (the direction perpendicular to the line BB shown in FIG. 3) and the first contact portion 42b. The position of the surface on the side surface 47c is different from the position of the adhesive by the thickness of the adhesive.

  According to this configuration, even if a rotational force is applied to the prism 47 in the vicinity of the side surface 47c, the vicinity of the side surface 47c is adhered from two directions by the prism holder 42, and thus the movement of the prism 47 is firmly prevented. be able to. Therefore, the prism 47 can be more effectively prevented from peeling off from the end face 42t of the prism holder 42.

  FIG. 6 is a diagram showing an imaging module 40A that is a first modification of the imaging module 40 shown in FIG. FIG. 7 is a perspective view showing the configuration of the prism holder 42 and the prism 47 of the imaging module 40A shown in FIG.

  The imaging module 40A includes a point that the main body part 42a of the prism holder 42 is changed to the main body part 420a, and a point that the first contact part 42b of the prism holder 42 is changed to the first contact part 420b. The configuration is the same as that of the imaging module 40 except for.

  As shown in FIG. 6, the position of the end surface 420 t on the side surface 47 c side in the direction parallel to the light incident surface 47 a and the light emitting surface 47 b of the prism 47 is the side surface 47 c in this direction. It has been changed to the same position as. That is, the end surface 420t and the side surface 47c of the main body 420a are formed on the same plane.

  The first contact portion 420b is a plate-like member extending along a plane formed by the end surface 420t of the main body portion 420a and the side surface 47c of the prism 47, and a double-sided tape or an adhesive or the like is applied to this plane. It is glued.

  In the imaging module 40, the main body portion 42a of the prism holder 42 and the first contact portion 42b are integrally formed, whereas in the imaging module 40A, the main body portion 420a of the prism holder 42 and the first contact portion 42b are integrally formed. The contact part 420b is configured as a separate body.

  Thus, even if the main body 420a and the first contact portion 420b of the prism holder 42 are formed separately, the first contact portion 420b is firmly bonded to the end surface 420t. Thus, the same effect as that of the imaging module 40 can be obtained.

  According to the imaging module 40A, the first contact portion 420b is bonded to the end surface 420t of the main body 420a of the prism holder 42 before the prism 47 is bonded to the prism holder 42. The first contact portion 420 b can be used for positioning the prism 47.

  FIG. 8 is a diagram showing an imaging module 40B that is a second modification of the imaging module 40 shown in FIG. FIG. 9 is a perspective view showing the configuration of the prism holder 42 and the prism 47 of the imaging module 40B shown in FIG.

  The imaging module 40B has the same configuration as the imaging module 40 except that the second abutting portion 42c is added to the prism holder 42.

  The second abutting portion 42c is a plate-like member that extends from the end of the main body portion 42a opposite to the observation window 101 side along the side surface 47d of the prism 47 and abuts on the side surface 47d.

  The second contact portion 42c extends along the direction in which the optical axis K extends from a region outside the region to which the prism 47 is bonded, of the end surface 42t of the main body portion 42a of the prism holder 42. The second contact portion 42c is bonded to the side surface 47d of the prism 47 via an adhesive.

  According to the configuration of the imaging module 40 </ b> B, the holding force of the prism 47 by the prism holder 42 can be reinforced by the adhesive force between the second contact portion 42 c provided in the prism holder 42 and the prism 47. For this reason, the reliability of a product can be improved more.

  Note that the second contact portion 42c shown in FIGS. 8 and 9 may be added to the prism holder 42 of the imaging module 40A shown in FIGS. In this case, it is not essential that the second contact portion 42c is bonded to the side surface 47d of the prism 47, and the second contact portion 42c is in direct contact with the side surface 47d of the prism 47. There may be.

  According to the configuration in which the second contact portion 42c is added to the imaging module 40A, the prism 47 is placed on the main body portion 420a of the prism holder 42 in a state where the prism 47 is positioned by the second contact portion 42c. Then, the first contact portion 420b can be bonded. For this reason, the imaging module 40A can be manufactured more easily than when the prism 47 is positioned using the first contact portion 420b, and the manufacturing cost can be reduced.

  In the above description, the prism holder 42 is configured separately from the lens barrel 41, but the lens barrel 41 and the prism holder 42 may be integrally formed.

  As described above, the following items are disclosed in this specification.

(1)
An objective optical member having an optical axis that is incident on the incident light from the observation window provided on the side surface of the distal end portion of the insertion portion to be inserted into the subject and intersects the longitudinal direction of the insertion portion;
A prism having a light incident surface on which light emitted from the objective optical member is incident and facing the light exit surface of the objective optical member;
An imaging device having an imaging surface parallel to the longitudinal direction of the insertion portion and fixed to the prism in a state where the imaging surface faces the light exit surface of the prism;
A prism holding member that holds the prism by adhering to the light incident surface of the prism;
The prism holding member is formed along the side surface of the main body bonded to the light incident surface of the prism and the side surface of the side surface of the prism that is positioned on the front end side in the longitudinal direction of the insertion portion, and contacts the side surface. An endoscope having a plate-like first contact portion in contact therewith.

(2)
(1) The endoscope according to the above,
The endoscope in which the first contact portion is bonded to the side surface located on the distal end side in the longitudinal direction of the insertion portion.

(3)
An endoscope according to (1) or (2),
The prism holding member further includes a second abutting portion that is formed along the side surface of the side surface of the prism that is located on the proximal side in the longitudinal direction of the insertion portion and that abuts on the side surface. mirror.

(4)
(3) The endoscope according to the above,
The endoscope in which the second contact portion is bonded to the side surface located on the longitudinal base end side of the insertion portion.

(5)
The endoscope according to any one of (1) to (4),
The endoscope in which the first contact portion is formed integrally with the main body portion.

(6)
The endoscope according to any one of (1) to (4),
The first contact portion is an endoscope formed separately from the main body portion.

(7)
The endoscope according to any one of (1) to (6),
A circuit board to which the image sensor is fixed;
A wiring cable fixed to the circuit board;
An endoscope in which a portion where the wiring cable is fixed to the circuit board is positioned on the longitudinal base end side of the side surface of the prism and on the base end side of the insertion portion.

(8)
The endoscope according to any one of (1) to (7);
A light source device to which the endoscope is connected;
An endoscope apparatus comprising: the endoscope connected to the endoscope; and a control device that controls the endoscope and the light source device.

DESCRIPTION OF SYMBOLS 100 Endoscope 1 Endoscope 2 Main body part 3 Display part 4 Control apparatus 5 Light source device 6 Input part 10 Insertion part 10A Soft part 10B Bending part 10C Tip part 101 Observation window 102 Illumination window 103 Forceps port 104 Standing stand 105 Exterior Housing 11 Operation box 12 Angle knob 13 Universal cord 40, 40A, 40B Imaging module 41 Lens barrel 42 Prism holders 42a, 420a Main body portions 42b, 420b First contact portion 42c Second contact portions 42t, 420t End surface 42k Aperture 43 First lens 44 Second lens 45 Third lens 46 Fourth lens 46a Exit surface K Optical axis 47 Prism 47a Light entrance surface 47b Light exit surfaces 47c, 47d Side surface 47e Inclined surface 50 Imaging element 51 Sensor unit 51a Imaging surface 52 Spacer 53 Translucent member 54 Semiconductor substrate 60 Circuit board 7 Wiring cable FX area

Claims (8)

An objective optical member having an optical axis that is incident on the incident light from the observation window provided on the side surface of the distal end portion of the insertion portion to be inserted into the subject and intersects the longitudinal direction of the insertion portion;
A prism having a light incident surface on which light emitted from the objective optical member is incident and opposed to the output surface of the objective optical member;
An imaging device having an imaging surface parallel to the longitudinal direction of the insertion portion and fixed to the prism in a state where the imaging surface faces the light exit surface of the prism;
A prism holding member that holds the prism by adhering to the light incident surface of the prism;
The prism holding member is formed along the side surface of the main body bonded to the light incident surface of the prism and the side surface of the side surface of the prism that is positioned on the front end side in the longitudinal direction of the insertion portion, and is in contact with the side surface. An endoscope having a plate-like first contact portion in contact therewith. The endoscope according to claim 1, wherein
The first contact portion is an endoscope that is bonded to the side surface that is located on the distal end side in the longitudinal direction of the insertion portion. The endoscope according to claim 1 or 2,
The prism holding member further includes a second contact portion that is formed along the side surface of the side surface of the prism that is positioned on the proximal side in the longitudinal direction of the insertion portion, and that further contacts the side surface. mirror. The endoscope according to claim 3, wherein
The endoscope in which the second contact portion is bonded to the side surface located on the longitudinal base end side of the insertion portion. The endoscope according to any one of claims 1 to 4,
The first contact portion is an endoscope formed integrally with the main body portion. The endoscope according to any one of claims 1 to 4,
The first contact portion is an endoscope formed separately from the main body portion. The endoscope according to any one of claims 1 to 6,
A circuit board to which the image sensor is fixed;
A wiring cable fixed to the circuit board; and
An endoscope in which a portion of the wiring cable fixed to the circuit board is positioned closer to the base end side in the longitudinal direction than the side face positioned on the base end side in the longitudinal direction of the insertion portion of the side surfaces of the prism. The endoscope according to any one of claims 1 to 7,
A light source device to which the endoscope is connected;
An endoscope apparatus comprising: a control device connected to the endoscope and controlling the endoscope and the light source device.

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