JP5580955B1 - Endoscopic eyepiece device and endoscope - Google Patents

Abstract

  The eyepiece device 10 of the endoscope 1 holds the eyepiece lens system 41 and rotates in conjunction with the lens unit 40 having the first cam pin 44 and the mounting operation of the photographing device to guide the first cam pin 44. A first cam groove 58 that moves the lens unit 40 to the focus reference position of the imaging device in the direction of the optical axis O, and a second cam groove that guides the first cam pin 44. 61, a second cylindrical cam 60 that can adjust the diopter value by displacing the position of the lens unit in the optical axis O direction, and a predetermined diopter range adjusted by the second cylindrical cam 60, A switching mechanism that switches the first cam pin 44 from the second cam groove 61 to abut on the first cam groove 58 in conjunction with the rotation of the first cylindrical cam 50 is provided.

Description

  The present invention relates to an endoscope limiter capable of adjusting an eyepiece and an endoscope including the eyepiece.

  2. Description of the Related Art Conventionally, some endoscopes are provided with an eyepiece device that allows a user to observe the naked eye. Some endoscope eyepieces can be equipped with an imaging device so that video can be observed.

  For example, in the conventional endoscope eyepiece device described in JP-B 05-22901, diopter adjustment is possible within a predetermined range in accordance with the refractive error of the user's eye in the eyepiece system during naked eye observation. It has become.

  In this conventional eyepiece apparatus, the specific reference position of the focus of the photographing apparatus is not disclosed, but the cam cylinder is rotated by mounting the photographing apparatus, so that the lens together with the cam pin is formed by the cam hole formed in the cam cylinder. The holder is raised, and the lens holder is moved to the reference position of the focal point of the photographing apparatus.

  That is, the conventional eyepiece apparatus is provided with an adjustment mechanism that automatically adjusts to the focus reference position corresponding to the imaging apparatus so that the imaging apparatus is in focus when the imaging apparatus is mounted. Yes.

  By the way, in recent years, visual impairments such as refractive errors of the user's eyes (myopia, hyperopia, astigmatism, etc.) have been diversified, and there is a demand for wide adjustment of the diopter range of the eyepiece device according to the user.

  However, if a new eyepiece device is provided that allows the diopter range to be widely adjusted, there is a problem that automatic adjustment to a reference position where the photographing device owned by the user is in focus is not suitable. For this reason, the user has to purchase again a photographing apparatus suitable for a new eyepiece apparatus that can adjust the diopter range widely, which increases the cost burden on the user.

  Therefore, the present invention has been made in view of the above problems, and even if an existing photographing apparatus is mounted, the present invention conforms to the focus reference position of the photographing apparatus, reduces the cost burden on the user, and diopter It is an object of the present invention to provide an endoscope eyepiece device capable of adjusting the range larger than before and an endoscope equipped with the eyepiece device.

An endoscope eyepiece apparatus according to one embodiment of the present invention is an endoscope eyepiece apparatus in which a photographing apparatus can be attached, and can move forward and backward in the optical axis direction of an optical image that is collected by holding an eyepiece lens system. A lens unit provided with a first cam pin, and a first cam groove that rotates in conjunction with the mounting operation of the photographing apparatus and guides the first cam pin, A first cylindrical cam that is displaced to a focus reference position of the imaging device in the optical axis direction and a second cam groove that guides the first cam pin are provided, and the light of the lens unit is rotated by a rotation operation. A second cylindrical cam whose position in the axial direction is displaced so that the diopter value can be adjusted within a predetermined range, and a predetermined diopter range adjusted by the second cylindrical cam, In conjunction with the rotation, the first cam pin is removed from the second cam groove. And a switching mechanism for switching to serial first cam groove and abut, the switching mechanism includes a second cam pins provided on the first cylindrical cam, is formed on the second cylindrical cam, In the predetermined diopter range, a third cam pin is formed so as to abut, and the second cylindrical cam is displaced so that the first cam pin abuts the first cam groove. And a cam groove .

An endoscope according to an aspect of the present invention is an endoscope eyepiece device to which a photographing apparatus can be attached, and is disposed so as to be movable forward and backward in an optical axis direction of an optical image that collects and holds an eyepiece lens system. A lens unit having a first cam pin, and a first cam groove that rotates in conjunction with the mounting operation of the photographing apparatus and guides the first cam pin, and the lens unit is arranged in the optical axis direction. A first cylindrical cam that is displaced to a focus reference position of the imaging device, and a second cam groove that guides the first cam pin, and is rotated in the optical axis direction of the lens unit. A second cylindrical cam whose position is displaced and the diopter value can be adjusted within a predetermined range, and a rotation of the first cylindrical cam within a predetermined diopter range adjusted by the second cylindrical cam. In conjunction with this, the first cam pin is moved from the second cam groove to the first cam pin. And a switching mechanism for switching to arm grooves abutting, the switching mechanism includes a second cam pins provided on the first cylindrical cam, is formed on the second cylindrical cam, wherein the predetermined viewing A third cam groove formed so that the second cam pin contacts the first cam pin in a range of degrees, and displaces the second cylindrical cam so that the first cam pin contacts the first cam groove; Comprising an eyepiece apparatus.

  According to the present invention, even when an existing photographing apparatus is mounted, an eyepiece of an endoscope that can be adjusted to a focus reference position of the photographing apparatus, reduce a cost burden on a user, and can adjust a diopter range larger than a conventional one. An apparatus and an endoscope provided with the eyepiece device can be provided.

Perspective view of endoscope according to the present embodiment Cross section of eyepiece Same sectional view of eyepiece FIG. 2 is a cross-sectional view of the eyepiece taken along line IV-IV in FIG. A plan view of the second sliding cylinder Same as above, explanation of operation of lens unit of eyepiece FIG. 6 is an operation explanatory diagram when the lens unit is displaced from the position of FIG. 6 to the reference position of the focal point of the photographing apparatus. Similarly, a cross-sectional view of the eyepiece apparatus in a state where the lens unit is displaced to the reference position of the focal point of the photographing apparatus. Same as above, explanation of operation of lens unit in eyepiece FIG. 9 is a diagram illustrating the operation when the lens unit is displaced from the position shown in FIG. Same operation diagram when the lens unit is displaced to the maximum negative diopter value FIG. 11 is an operation explanatory diagram when the lens unit is displaced from the position of FIG. 11 to the reference position of the focal point of the photographing apparatus. FIG. 3 is a development view of the outer peripheral surfaces of the first sliding cylinder and the second sliding cylinder in a state adjusted to the maximum diopter value on the negative side. FIG. 3 is a developed view of the outer peripheral surfaces of the first sliding cylinder and the second sliding cylinder in a state displaced to the reference position of the focal point of the photographing apparatus. Same as above, explanation of operation of lens unit in eyepiece FIG. 15 is an explanatory diagram of the operation when the lens unit is displaced to the reference position of the focal point of the photographing apparatus of FIG. Same operation diagram when the lens unit is displaced to the maximum positive diopter value FIG. 17 is an operation explanatory diagram when the lens unit is displaced from the position of FIG. 17 to the reference position of the focal point of the photographing apparatus. Same as above, explanation of operation of lens unit in eyepiece FIG. 19 is an explanatory diagram of the operation when the lens unit is displaced to the in-focus reference position of the photographing apparatus of FIG. FIG. 2 is a development view of the outer peripheral surfaces of the first sliding cylinder and the second sliding cylinder in a state adjusted to the maximum diopter value on the plus side. FIG. 3 is a developed view of the outer peripheral surfaces of the first sliding cylinder and the second sliding cylinder in a state displaced to the reference position of the focal point of the photographing apparatus. Same as above, the operation explanatory diagram of the lens unit adjusted to the maximum diopter value on the plus side FIG. 23 is an operation explanatory diagram when the lens unit is displaced from the position of FIG. 23 to the reference position of the focal point of the photographing apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an endoscope, FIG. 2 is a sectional view of an eyepiece device, FIG. 3 is a partial sectional view of the eyepiece device, and FIG. 4 is an eyepiece taken along line IV-IV in FIG. FIG. 5 is a plan view of the second sliding cylinder, FIG. 6 is an operation explanatory diagram of the lens unit of the eyepiece device, and FIG. 7 is a lens unit from the position of FIG. 6 to the reference position of the focal point of the photographing apparatus. FIG. 8 is a sectional view of the eyepiece in a state where the lens unit is displaced to the reference position of the focal point of the photographing apparatus, FIG. 9 is an operation explanatory diagram of the lens unit in the eyepiece, and FIG. FIG. 11 is an operation explanatory view when the lens unit is displaced from the position of FIG. 9 to the in-focus reference position of the photographing apparatus, FIG. 11 is an operation explanatory view when the lens unit is displaced to the negative maximum diopter value, and FIG. The lens unit is moved from the position shown in FIG. 11 to the reference position of the focal point of the photographing apparatus. FIG. 13 is a developed view of the outer peripheral surfaces of the first sliding cylinder and the second sliding cylinder in a state adjusted to the maximum diopter value on the minus side, and FIG. FIG. 15 is an exploded view of the outer peripheral surfaces of the first sliding cylinder and the second sliding cylinder in a state of being displaced to the reference position of the focal point of the photographing apparatus, FIG. 15 is an explanatory diagram of the operation of the lens unit in the eyepiece apparatus, and FIG. FIG. 17 is an operation explanatory diagram when the lens unit is displaced to the reference position of the in-focus point of FIG. 15, FIG. 17 is an operation explanatory diagram when the lens unit is displaced to the maximum maximum diopter value, and FIG. FIG. 19 is a diagram illustrating the operation of the lens unit in the eyepiece device, and FIG. 20 is a diagram illustrating the focus point of the photographing device in FIG. 19. FIG. 2 is a diagram for explaining the operation when the lens unit is displaced. FIG. 22 is a development view of the outer peripheral surfaces of the first sliding cylinder and the second sliding cylinder adjusted to the maximum diopter value on the plus side, and FIG. 22 shows the state displaced to the reference position of the focal point of the photographing apparatus. FIG. 23 is a developed view of the outer peripheral surface of the first sliding cylinder and the second sliding cylinder, FIG. 23 is an operation explanatory diagram in a state where the lens unit is adjusted to the maximum diopter value on the plus side, and FIG. 24 is the position of FIG. It is operation | movement explanatory drawing when a lens unit moves to the reference position of the focal point of an imaging device from.

  In the following description, the drawings based on the embodiments are schematic, and the relationship between the thickness and width of each part, the ratio of the thickness of each part, and the like are different from the actual ones. There should be a case where parts having different dimensional relationships and ratios are included in the drawings.

  As shown in FIG. 1, the endoscope 1 includes a long insertion portion 2 to be inserted into a subject, an operation portion 3 provided at the proximal end of the insertion portion 2, and a side portion of the operation portion 3. An extended universal cord 12, an eyepiece 10 that is an eyepiece provided at the proximal end of the operation unit 3, and an endoscope connector 11 provided at the extended end of the universal cord 12. This is a so-called fiberscope having a main part.

  The endoscope 1 can be connected to an external device (not shown) such as a light source device via an endoscope connector 11. In addition, an imaging device (not shown) can be attached to the eyepiece device 10 of the endoscope 1 so that video observation can be performed in addition to naked-eye observation.

  The insertion portion 2 has a distal end rigid portion 6 located on the distal end side, a bending portion 5 provided continuously with the proximal end of the distal end rigid portion 6, and a flexibility provided continuously with the proximal end of the bending portion 5. The main part is comprised including the flexible tube part 4.

  Note that an observation lens, an illumination lens, and the like (not shown) are provided in the distal end hard portion 6. Further, the bending portion 5 can be bent in two directions, for example, up and down, by turning a bending lever 7 provided in the operation portion 3.

  In addition, the operation unit 3 is provided with a treatment instrument insertion port 8. The treatment instrument insertion port 8 communicates with a proximal end side of a treatment instrument insertion channel (not shown) inserted into the insertion portion 2. As a result, the treatment instrument inserted into the treatment instrument insertion port 8 is guided to the distal end side of the insertion portion 2 via the treatment instrument insertion channel, and from the opening formed on the distal end surface of the distal end rigid portion 6, It is possible to project into the specimen.

  The operation unit 3 is provided with two caps 9 for performing an air / water supply operation or a suction operation as an endoscope function. One of the caps 9 is equipped with an air / water button for air / water feeding operation, and the other is equipped with a suction valve (both not shown).

  Here, in the insertion unit 2 and the operation unit 3, in addition to the treatment instrument insertion channel, a light guide that transmits illumination light to the illumination lens described above, and the inside of the subject condensed on the observation lens described above An image guide (described later) that transmits an optical image to the eyepiece device 10, an angle wire (not shown) for bending the bending portion 5 in conjunction with the turning operation of the bending lever 7, etc. are inserted. . The light guide is also inserted into the universal cord 12 and the endoscope connector 11.

  Next, the eyepiece apparatus 10 of the endoscope 1 according to the present embodiment will be described below with reference to FIGS. Regarding the components of the eyepiece 10, known components will be omitted or briefly described except those related to the main components of the present invention.

As shown in FIG. 2, the eyepiece device 10 of the present embodiment includes a mount body 15 to which an imaging device (not shown) can be attached.
In the eyepiece 10, the image guide unit 30 is fixed inside the eyepiece 20. In this image guide unit 30, an image guide 31 is inserted into a protective cylinder portion 32 that is inserted into the insertion portion 2 and the operation portion 3, the protective cylinder portion 32 is fixed, and a mounting connector provided with a transparent cover 34. 33 is mainly provided.

  Then, inside the eyepiece 20 of the eyepiece 10, the central axis O of the eyepiece 10 with respect to the image guide unit 30 (the optical axis of the optical image collected by the eyepiece lens group 41 described later) The lens unit 40 is provided so as to be freely advanced and retracted while being linearly guided along the central axis O.

  The lens unit 40 includes a lens frame 42 that holds an eyepiece lens group 41 that is an eyepiece lens system. In the lens unit 40, the lens frame 42 is urged by the first urging spring 43, and the urging force is applied to the image guide unit 30 side.

  A first cam pin 44 is screwed onto the lens frame 42 (see FIGS. 2 and 4). The first cam pin 44 is inserted through a through hole 21 formed in the eyepiece 20 and is erected outward from the eyepiece 20.

  A partition cylinder 71 fixed by a fixing screw 75 is disposed on the outer periphery of the eyepiece 20 (see FIGS. 2 to 4). Between the eyepiece tube 20 and the partition tube 71, a first slide tube 50 is rotatably disposed around the eyepiece tube 20 and the lens unit 40 so as to be held by the partition tube 71. . The first sliding cylinder 50 has a large diameter part 51 and a small diameter part 52.

  The large diameter portion 51 of the first sliding cylinder 50 is formed with a groove portion 53 that engages with an end portion of the interlocking pin 55 that is screwed to the photographing ring 56. When the imaging device (not shown) is attached to the eyepiece 10, the interlocking pin 55 moves the first sliding cylinder 50 in a predetermined rotational position (photographing described later) in conjunction with the mounting operation of the imaging device. It is for displacing to the reference position of the focal point of the apparatus.

  A second cam pin 54 is screwed to the small diameter portion 52 of the first sliding cylinder 50 so as to stand outward. The small-diameter portion 52 is formed with a first cam groove 58 that contacts the first cam pin 44 provided on the lens frame 42 and displaces the lens unit 40 to a predetermined position along the central axis O. Yes.

  That is, the first sliding cylinder 50 rotates when the imaging device (not shown) is attached to the eyepiece device 10, so that the cam groove 58 contacts the first cam pin 44 and the lens unit 40. The cylindrical cam is configured to be displaced to the reference position of the focal point of the photographing apparatus.

  The first cam groove 58 and the second cam pin 54 are provided at substantially point-symmetrical positions with the rotation center OC through which the central axis O of the first sliding cylinder 50 passes as a reference point ( (See FIG. 4). Further, the small diameter portion 52 of the first sliding cylinder 50 accommodates a pin 77 screwed so as to stand upright on the outer peripheral portion of the eyepiece 20, and the rotation range of the first sliding cylinder 50 is accommodated. A rotation restricting groove 57 is defined (see FIGS. 3 and 4).

  The partition cylinder 71 is formed with two through holes 72 and 73 through which the first cam pin 44 and the second cam pin 54 are inserted, respectively (see FIGS. 2 and 4).

  Among them, the through hole 72 through which the first cam pin 44 is inserted does not interfere with the first cam pin 44 in the movement range of the lens unit 40 so as not to prevent the displacement along the central axis O of the lens unit 40. Thus, it is a long hole drilled in the axial direction.

  On the other hand, the through hole 73 through which the second cam pin 54 is inserted does not hinder the rotation of the first sliding cylinder 50, so that the second cam pin is within the rotation range of the first sliding cylinder 50. It is a long hole drilled in the circumferential direction so as not to interfere with 54 (see FIG. 4).

  Note that, within the above-described rotation restriction range of the first sliding cylinder 50, the second cam pin 54 is linked with the first sliding cylinder 50 during a mounting operation of the imaging device (not shown). The first cam pin 44 moves to a substantially point-symmetrical position with the rotation center OC as a reference point (see FIG. 8).

  A second slide cylinder 60 is rotatably disposed on the outer peripheral portion of the partition cylinder 71. In the second sliding cylinder 60, the direction in which the lens unit 40 is urged by the first urging spring 43 by the urging force of the second urging spring 68 (the distal end of the endoscope 1 and the eyepiece 10). Is biased in the direction opposite to the direction (the proximal direction in the endoscope 1 and the eyepiece 10).

  The second sliding cylinder 60 includes a second cam groove 61 for diopter adjustment that contacts the first cam pin 44 and displaces the lens unit 40 along the central axis O, and a second cam pin 54. A third cam groove 62 that abuts and rotates the attitude of the second sliding cylinder 60 about the axis X to tilt it at a predetermined angle with respect to the central axis O is formed within a predetermined range. (See FIGS. 4 and 5).

  The second cam groove 61 is a concave groove formed by cutting out the peripheral end surface on the proximal end side of the second sliding cylinder 60. On the other hand, the third cam groove 62 is a long hole-like groove formed so as to penetrate the peripheral portion of the second sliding cylinder 60. That is, the second sliding cylinder 60 constitutes a cylindrical cam that is displaced along the central axis O of the lens unit 40.

  The second cam groove 61 and the third cam groove 62 are provided at substantially point-symmetrical positions with the rotation center OC in the second sliding cylinder 60 as a reference point (see FIG. 4).

  Further, the second sliding cylinder 60 has a small diameter portion 52 of the first sliding cylinder 50 when the posture is rotated about the axis X and tilted to a predetermined angle with respect to the central axis O. A concave portion 66 along the third cam groove 62 is formed on one circumferential end surface side where the second cam groove 61 is formed so as not to interfere with each other (see FIG. 5).

  Further, the second sliding cylinder 60 has an engagement groove 69 into which an end portion of the interlocking pin 76 screwed to the diopter adjustment ring 65 is engaged (see FIG. 3). That is, the second sliding cylinder 60 is moved along the outer periphery of the partition cylinder 71 in conjunction with the rotation of the diopter adjustment ring 65 by the end of the interlocking pin 76 coming into contact with the side wall of the engagement groove 69. Rotate.

  The engagement groove 69 of the diopter adjustment ring 65 has a direction (center) perpendicular to the rotation direction of the diopter adjustment ring 65 and the second slide cylinder 60 so that the second slide cylinder 60 can tilt. The second sliding cylinder 60 is movable in the axial direction parallel to the central axis O with respect to the diopter adjustment ring 65 and the interlocking pin 76. The long groove extends in the axial direction parallel to the axis O. ing.

The operation of the eyepiece apparatus 10 of the present embodiment configured as described above will be described below.
First, an operation in which the lens unit 40 is displaced to a reference position that is a focal point of the imaging device when the imaging device (not shown) is attached to the eyepiece 10 will be described below.

  The eyepiece device 10 here is in a state in which the first cam pin 44 of the lens unit 40 is in contact with the second cam groove 61 in the circumferential direction of the second sliding cylinder 60 at a substantially central position. An example of a state in which the imaging device is mounted in a state in which the lens unit 40 is displaced toward the distal end side so that the diopter value is on the minus side of a predetermined diopter value (α diopter) that the imaging device is in focus. Will be described.

  Note that the eyepiece device 10 is in a state where the first cam pin 44 is not in contact with the first cam groove 58 of the first sliding cylinder 50 when the imaging device is not attached.

  When the imaging device is mounted on the eyepiece 10, the interlocking pin 55 is displaced in accordance with the mounting operation of the imaging device, and the first sliding cylinder 50 interlocking with the interlocking pin 55 is shown in the state shown in FIG. 7 so as to be in the state shown in FIG.

  Specifically, the first cam pin 44 of the lens unit 40 that is in contact with the second cam groove 61 of the second sliding cylinder 60 is rotated as shown in FIG. As shown in FIG. 7 from the state shown, the first cam groove 58 is guided to the reference surface 58a by contacting the first cam groove 58.

  At this time, the first cam pin 44 is separated from the abutting second cam groove 61 to the base end side, which is the upper side when viewed in the drawing, by the guidance of the first cam groove 58. .

  Accordingly, since the first cam pin 44 is integrated with the lens unit 40, the first cam pin 44 is moved to the base end side by the guidance of the first cam groove 58. It moves along the central axis O toward the base end side against the urging force of the urging spring 43.

  As described above, the eyepiece device 10 is moved by the first cam pin 44 guided to the first cam groove 58 being guided to the position where the first cam pin 44 contacts the reference surface 58a of the first cam groove 58, so that the lens unit is moved. 40 is set so as to be displaced to a reference position which becomes a focal point of an imaging apparatus (not shown).

  In this way, the eyepiece device 10 according to the present embodiment is automatically adjusted to a predetermined diopter value (α diopter) in which the attached imaging device (not shown) is in focus.

  At this time, the second cam pin 54 provided in the first sliding cylinder 50 has a rotation center OC as a reference point with respect to the first cam pin 44 of the lens unit 40 as shown in FIG. Move to a point-symmetrical position.

  The second cam pin 54 moves from the state shown in FIG. 9 to the state shown in FIG. 10 as the first sliding cylinder 50 rotates, but is in contact with the third cam groove 62 ( The action is not induced and is not guided to the third cam groove 62.

  That is, the third cam groove 62 captures an image on the eyepiece device 10 at the rotation position of the second sliding cylinder 60 in a state where the first cam pin 44 is in contact with the second cam groove 61 at a substantially central position. The shape and cam curve are set such that the second cam pin 54 does not act even if the device (not shown) is mounted and the first sliding cylinder 50 rotates.

  Next, the diopter adjustment ring 65 is rotated in a state where an imaging device for naked eye observation is not attached, so that the negative maximum diopter value (−β diopter) in the eyepiece device 10 is adjusted. The operation will be described below.

  Note that the eyepiece device 10 of the present embodiment can adjust the diopter to the minus side by rotating the diopter adjustment ring 65 in the clockwise direction as viewed toward the distal end side. .

  In the eyepiece device 10, when the diopter adjustment ring 65 is rotated clockwise, the second sliding cylinder 60 is also rotated clockwise in conjunction with the diopter adjustment ring 65.

  At this time, the first cam pin 44 of the lens unit 40 that is in contact with the second cam groove 61 of the second sliding cylinder 60 is rotated by the rotation of the second sliding cylinder 60 so that the second cam groove 44 11 and guided to one end portion of the second cam groove 61 as shown in FIG.

  In accordance with this, the lens unit 40 provided with the first cam pin 44 receives the urging force of the urging spring 43 and moves to the central axis O toward the most distal side, which is the lower side when viewed toward the drawing sheet. It will be in the state which moved along.

  Thus, the state in which the lens unit 40 is displaced to the most distal end along the central axis O is the negative maximum diopter value (−β diopter) in the eyepiece device 10. The lens unit 40 displaced to the negative maximum diopter value (−β diopter) moves to the tip side from the reference position at which the predetermined diopter value (α diopter) is in focus. It is in a state of being.

  Next, when the eyepiece device 10 is adjusted to the negative maximum diopter value (−β diopter) in this way, when the imaging device (not shown) is attached to the eyepiece device 10, the lens unit 40 takes an image. The operation of displacing to the reference position that becomes the focal point of the apparatus will be described below.

  When the imaging device is mounted on the eyepiece 10, the interlocking pin 55 is interlocked with the mounting operation of the imaging device, and the first sliding cylinder 50 changes from the state shown in FIG. 11 to the state shown in FIG. It rotates as follows.

  Specifically, as shown in FIG. 13, the first cam pin 44 of the lens unit 40 that is in contact with the second cam groove 61 of the second sliding cylinder 60 is connected to the first sliding cylinder 50. By abutting on the first cam groove 58 by the rotation, it is guided to the reference surface 58a of the first cam groove 58 as shown in FIG.

  At this time, the first cam pin 44 is separated from the second cam groove 61 that is in contact with the base end side, which is the upper side when viewed toward the paper surface of the drawing, by the guidance of the first cam groove 58. That is, the second cam groove 61 does not act on the first cam pin 44.

  Accordingly, the lens unit 40 resists the urging force of the urging spring 43 as the first cam pin 44 guided in the first cam groove 58 moves, as shown in FIG. , It moves along the central axis O toward the base end side, which is the upper side when viewed toward the drawing sheet.

  As described above, the lens unit 40 moves to a position where the first cam pin 44 is guided by the first cam groove 58 and contacts the reference surface 58a of the first cam groove 58 in the same manner as described above. Displace to the reference position that is the focal point of the device.

  Thus, when the imaging apparatus is mounted, the eyepiece device 10 of the present embodiment automatically changes from the maximum negative diopter value (−β diopter) to a predetermined diopter value (α diopter) that the imaging apparatus is in focus. Adjusted.

  Again, the second cam pin 54 moves from the state shown in FIG. 15 to the state shown in FIG. 16, but does not come into contact with the third cam groove 62. It is designed not to be induced. That is, the third cam groove 62 has an imaging device (not shown) in the eyepiece 10 at the rotation position of the second sliding cylinder 60 adjusted to the maximum negative diopter value (−β diopter). A shape and a cam curve are set so that the second cam pin 54 does not act even if the first sliding cylinder 50 is mounted and rotated.

  Next, the diopter adjustment ring 65 is rotated in a state where an imaging device for naked eye observation is not attached, so that the maximum diopter value on the plus side (+ γ diopter) in the eyepiece device 10 is adjusted. The operation will be described below.

  The eyepiece device 10 of the present embodiment can adjust the diopter to the plus side by rotating the diopter adjustment ring 65 counterclockwise as viewed toward the distal end, and the diopter adjustment ring. In conjunction with 65, the second sliding cylinder 60 is also rotated counterclockwise.

  At this time, the first cam pin 44 of the lens unit 40 that is in contact with the second cam groove 61 of the second sliding cylinder 60 is rotated by the rotation of the second sliding cylinder 60 so that the second cam groove 44 As shown in FIG. 17, the second cam groove 61 is adjusted to the negative maximum diopter value (−β diopter) and is adjusted to the other end opposite to the other end. Guided to the end.

  In accordance with this, the lens unit 40 is moved along the central axis O toward the most proximal side, which is the upper side when viewed toward the paper surface in the figure, against the urging force of the urging spring 43. .

  Thus, the state in which the lens unit 40 is displaced to the most proximal side along the central axis O is the plus-side maximum diopter value (+ γ diopter) in the eyepiece device 10.

  The lens unit 40 displaced to the plus-side maximum diopter value (+ γ diopter) moves to the base end side from the reference position where the predetermined diopter value (α diopter) is in focus. It is in a state of being.

  Of course, the lens unit 40 displaced to the maximum positive diopter value (+ γ diopter) is in a state of moving to the base end side from the position where the maximum diopter value (−β diopter) is negative. .

  In other words, the eyepiece device 10 is adjustable by rotating the diopter adjustment ring 65 from the minus maximum diopter value (−β diopter) to the plus maximum diopter value (+ γ diopter). A predetermined diopter value (α diopter) that is in focus within the diopter adjustment range from the negative maximum diopter value (−β diopter) to the positive maximum diopter value (+ γ diopter). It is set (−β <α <+ γ).

  Thus, when the imaging device is mounted on the eyepiece device 10 from the state where the eyepiece device 10 is adjusted to the negative maximum diopter value (−β diopter), the lens unit 40 becomes a reference point that becomes the focal point of the imaging device. The operation of shifting to the position will be described below.

  When the imaging device is mounted on the eyepiece 10, the interlocking pin 55 is interlocked with the mounting operation of the imaging device, and the first sliding cylinder 50 changes from the state shown in FIG. 17 to the state shown in FIG. It rotates as follows.

  Specifically, as shown in FIGS. 17 and 21, the first cam pin 44 of the lens unit 40 that is in contact with the second cam groove 61 of the second sliding cylinder 60 is moved in the first sliding manner. By contacting the first cam groove 58 by the rotation of the cylinder 50, the cylinder 50 is guided to the reference surface 58a of the first cam groove 58 as shown in FIGS.

  On the other hand, the second cam pin 54 of the first sliding cylinder 50 rotates the first sliding cylinder 50 from the state shown in FIGS. 19 and 21 to the state shown in FIGS. 20 and 22. Along with this, it moves in the third cam groove 62 of the second sliding cylinder 60.

  Then, when the second cam pin 54 reaches the inclined surface 62 a of the third cam groove 62, the second cam pin 54 starts to contact from the middle portion of the inclined surface 62 a and contacts the contact surface 62 b of the third cam groove 62. Move to the state.

  At this time, the second cam pin 54 is guided by the contact with the contact surface 62b so as to press the second sliding cylinder 60 to the base end side which is the upper side when viewed toward the paper surface of the drawing. .

  When the second sliding cylinder 60 is pressed to the base end side by the second cam pin 54, the third cam groove 62 side is the base end side so that the state shown in FIG. 23 is changed to the state shown in FIG. And the second cam groove 61 side is displaced so as to move to the tip side.

  That is, as described above, the second sliding cylinder 60 is rotated about the axis X shown in FIG. 5 by the guidance of the second cam pin 54 that contacts the third cam groove 62. , Tilt as shown in FIG.

  The first cam pin 44 of the lens unit 40 has a second cam groove 61 that is in contact with the first cam pin 44 when the second slide tube 60 is tilted in the turning process of the first slide tube 50. Since the cam groove 58 moves to the tip side from the reference surface 58a, the cam groove 58 is once displaced from the reference surface 58a to the tip side.

  Then, when the first sliding cylinder 50 is rotated to the end, the first cam pin 44 comes into contact with the first cam groove 58 and is guided. At this time, the first cam pin 44 is separated from the second cam groove 61. That is, the second cam groove 61 does not act on the first cam pin 44.

  Accordingly, the lens unit 40 resists the urging force of the urging spring 43 as the first cam pin 44 guided in the first cam groove 58 moves, as shown in FIG. , Move along the central axis O toward the base end side.

  As described above, the lens unit 40 moves to a position where the first cam pin 44 is guided by the first cam groove 58 and contacts the reference surface 58a of the first cam groove 58 in the same manner as described above. It is displaced to a reference position that is a focal point of the device (not shown).

  Thus, the eyepiece device 10 of the present embodiment automatically adjusts from the positive maximum diopter value (+ γ diopter) to the predetermined diopter value (α diopter) that is in focus when the image pickup device is mounted. Is done.

  From the above description, the eyepiece device 10 according to the present embodiment has the second cam groove 61 formed in the second sliding cylinder 60 in contact with the first cam pin 44 provided in the lens unit 40, so that the second The diopter adjustment range from the negative maximum diopter value (−β diopter) to the positive maximum diopter value (+ γ diopter) by being guided with the rotation of the sliding cylinder 60. The configuration can be adjusted with.

  The eyepiece device 10 includes a first cam groove 58 in which the first cam pin 44 is formed in the first sliding cylinder 50 from the contact with the second cam groove 61 in accordance with the mounting operation of the imaging device. There is provided a switching mechanism for switching so as to abut on. By this switching mechanism, the eyepiece device 10 to which the imaging device is mounted automatically adjusts the lens unit 40 adjusted to a predetermined diopter value to a predetermined diopter value (α diopter) that is in focus of the imaging device.

  Here, the switching mechanism is configured so that the second sliding cylinder 60 is also used when the lens unit 40 is adjusted to a maximum diopter value (+ γ diopter) on the plus side of a predetermined diopter value (α diopter). The first cam pin 44 is brought into contact with the second cam groove 61 by the induction of the second cam pin 54 provided in the first sliding cylinder 50 which is in contact with the third cam groove 62 formed in It is possible to switch so as to contact the first cam groove 58 formed in the first sliding cylinder 50.

  In other words, the switching mechanism makes contact with the third cam groove 62 when the lens unit 40 is adjusted to the maximum diopter value (+ γ diopter) on the plus side of the predetermined diopter value (α diopter). The posture of the second sliding cylinder 60 is tilted by the induction of the second cam pin 54, and the first cam pin 44 is formed in the first sliding cylinder 50 from the contact with the second cam groove 61. The first cam groove 58 is configured to be switched so as to abut.

  Note that the eyepiece device 10 changes the shape (angle) of the second cam groove 61 of the second sliding cylinder 60 that guides the first cam pin 44 of the lens unit 40, thereby increasing the desired negative side maximum. The diopter adjustment range from the diopter value (−β diopter) to the positive maximum diopter value (+ γ diopter) can be freely set.

  As described above, in the eyepiece device 10 of the present embodiment, when the imaging device is mounted in any adjustment range from the maximum negative diopter value (−β diopter) to the maximum positive diopter value (+ γ diopter). The imaging apparatus can be automatically adjusted to a predetermined diopter value (α diopter) that is in focus.

  The eyepiece device 10 of the present embodiment can be configured so that the diopter adjustment range can be adjusted wider than before, and even if the diopter adjustment range is widened, the focus reference position of the existing imaging device Is configured so that it can be automatically adjusted to a predetermined diopter value (α diopter) that conforms to This eliminates the need for the user to purchase again an imaging device that is compatible with the eyepiece device 10, and has an advantage of preventing an increase in cost burden.

  From the above description, the eyepiece device 10 of the endoscope 1 according to the present embodiment is adapted to the focus reference position of the imaging device even when the existing imaging device is mounted, thereby reducing the cost burden on the user. Thus, the diopter range can be adjusted to be larger than the conventional one.

  The invention described in the above-described embodiment is not limited to the embodiment 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.

  This application is based on Japanese Patent Application No. 2013-47111 filed in Japan on March 8, 2013 as a basis for claiming priority, and the above content is the specification of Japanese Patent Application No. 2013-47111. , Claims and drawings.

Claims (5)

An eyepiece device for an endoscope in which a photographing device can be freely mounted,
A lens unit that is disposed so as to be movable back and forth in the optical axis direction of an optical image that holds and collects the eyepiece lens system;
The first cam groove that rotates in conjunction with the mounting operation of the photographing apparatus and guides the first cam pin is provided, and the lens unit is displaced to the focus reference position of the photographing apparatus in the optical axis direction. A first cylindrical cam;
A second cam groove for guiding the first cam pin is provided, and a diopter value can be adjusted within a predetermined range by displacing the position of the lens unit in the optical axis direction by rotating the second cam groove. A cylindrical cam,
In a predetermined diopter range adjusted by the second cylindrical cam, the first cam pin is moved from the second cam groove to the first cam groove in conjunction with the rotation of the first cylindrical cam. A switching mechanism that switches so as to abut,
With
The switching mechanism is
A second cam pin provided on the first cylindrical cam;
The second cam is formed on the second cylindrical cam so that the second cam pin abuts on the predetermined diopter range, and the first cam pin abuts on the first cam groove. A third cam groove for displacing the two cylindrical cams;
An eyepiece device for an endoscope, comprising: When the photographing apparatus is mounted, the third cam groove is pressed by the second cam pin interlocked with the rotation of the first cylindrical cam, and the second cylindrical cam is tilted and displaced. The endoscope eyepiece device according to claim 1 . 2. The endoscope eyepiece according to claim 1, wherein the first cam groove and the third cam groove are formed at substantially point symmetrical positions with respect to the optical axis. The endoscope eyepiece apparatus according to claim 1, wherein the predetermined diopter range is on a plus side with respect to a diopter value of a focus reference position of the photographing apparatus. An endoscope comprising the eyepiece device according to any one of claims 1 to 4 .

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