JP2015210501A - Optical device and endoscope including optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical device that can surely retain an optical member varying optical characteristic at a prescribed still position, and prevents high temperature.SOLUTION: An optical device 40 comprises: an optical characteristic changing member 60 that has an optical member 64 retained by an optical retaining member 62 pivotally attached to a shaft member 61 made up of a permanent magnet, and allows the optical member 64 to be displaced at a first still position where the optical member enters into an optical path and at a second still position where the optical member retreats from the optical path; an electromagnetic driving source 80 that switches a magnetic field by electromagnets 86 and 87 to cause the optical characteristic changing member 60 to be displaced at the first still position and at the second still position; and magnetic members 71 and 72 that are provided at a prescribed spaced from the shaft member 61, receives magnetic force owing to the magnetic field of the shaft member 61 in a state where an amount of supply of a drive current to the electromagnetic driving source 80 is reduced or halted after the optical characteristic changing member 60 is displaced at the first still position or the second still position, and retains a still state of the optical characteristic changing member 60.

Description

  The present invention relates to an optical device that inserts and removes an optical member with respect to an optical path such as an imaging optical system, and an endoscope including the optical device.

  2. Description of the Related Art Conventionally, an endoscope (electronic endoscope) in which a small imaging device is built in the distal end of an insertion portion, a portable device in which a small imaging device is built in, and the like are well known. In recent years, with the improvement in performance of these electronic endoscopes, portable devices, etc., there is an increasing demand for adopting a focus function, a variable aperture function, and the like for an optical system constituting this type of imaging apparatus.

  In response to such demands, various optical devices have been proposed for inserting and removing optical members such as lenses and stops on the optical path of the optical system of the imaging device. For example, Patent Document 1 discloses a diaphragm blade that is an optical member by magnetizing a rotary shaft member that rotatably supports a light adjusting unit, and rotating the rotary shaft member with a magnetic force generated from an electromagnetic drive source. An incident light adjusting device, which is an optical device that moves the first to a first stationary position that overlaps the first opening (optical path) and a second stationary position that is retracted from the first opening, is disclosed.

JP 2009-80470 A

  By the way, in the conventional optical device (incident light adjusting device), the optical member (aperture blade) is moved to the first stationary position or the second stationary position, and then the current amount to the electromagnetic drive source is reduced or stopped. In such a case, since the holding force of the optical member is weak, there is a problem that the optical member rotates around the axis of the rotation shaft member due to an impact or the like to cause a positional shift.

  Therefore, in the conventional optical device, in order to securely hold the optical member at the first stationary position or the second stationary position, a predetermined current amount to the electromagnetic drive source when driving the optical member is not changed. It was necessary to keep flowing.

  However, since the electromagnetic drive source generates heat when a current amount continues to flow, there is a problem that the distal end portion of the endoscope in which the optical device is built, the portable device, and the like become high temperature.

  Accordingly, the present invention has been made in view of the above circumstances, and an optical device that can reliably hold an optical member that changes optical characteristics at a predetermined stationary position and prevents an increase in temperature, and an endoscope including the optical device. The purpose is to provide.

  An optical device according to an aspect of the present invention is held by a shaft member made of a permanent magnet polarized in two magnetic poles in a direction orthogonal to the axial direction, an optical holding member pivotally attached to the shaft member, and the optical holding member. The optical member is pivotable about the axis of the shaft member, and is freely displaceable between a first stationary position for entering the optical path of the optical system and a second stationary position for retracting from the optical path. An optical property changing member and an electromagnet capable of generating a magnetic field acting on the magnetic pole of the shaft member, and the optical property changing member is moved to the first stationary position or the second position by switching the magnetic field by the electromagnet. An electromagnetic drive source that is displaced to a stationary position is provided at a predetermined distance from the shaft member. After the optical property changing member is displaced to the first stationary position or the second stationary position, the electromagnetic Driving In a state where the supply amount of the drive current to the source is reduced or stopped, it receives the attractive force by the magnetic field of the shaft member, and includes a magnetic member for holding the stationary state of the optical property changing member.

  An endoscope according to an aspect of the present invention is held by a shaft member made of a permanent magnet polarized in two magnetic poles in a direction orthogonal to the axial direction, an optical holding member axially attached to the shaft member, and the optical holding member The optical member is rotated around the axis of the shaft member, and the optical member is displaced to a first stationary position for entering the optical path of the optical system and a second stationary position for retracting from the optical path. A flexible optical property changing member and an electromagnet capable of generating a magnetic field acting on the magnetic pole of the shaft member, and the optical property changing member is moved to the first stationary position or the second by switching the magnetic field by the electromagnet. An electromagnetic drive source that is displaced to a stationary position, and a distance away from the shaft member by a predetermined distance, and after the optical property changing member is displaced to the first stationary position or the second stationary position, Electromagnetic drive An optical device comprising: a magnetic member that retains the stationary state of the optical property changing member by receiving an attractive force due to the magnetic field of the shaft member in a state where the amount of drive current supplied to the shaft is reduced or stopped It is equipped with the front-end | tip part.

  ADVANTAGE OF THE INVENTION According to this invention, the optical member which can hold | maintain the optical member which changes an optical characteristic reliably in a predetermined stationary position, and prevented high temperature and the endoscope provided with the optical apparatus are realizable.

The figure which shows the whole structure of the endoscope of 1 aspect of this invention. Sectional drawing which shows the structure of the front-end | tip part of the insertion part along the II-II line of FIG. The exploded perspective view showing the configuration of the optical unit as the optical device The perspective view which shows the structure of the optical unit as an optical apparatus similarly Side view showing the configuration of the optical unit Sectional drawing which shows the structure of the optical unit along the VI-VI line of FIG. FIG. 5 is a plan view showing the configuration of the optical unit in the direction of arrow VII in FIG. The top view which shows the relationship between the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and an electromagnetic drive source similarly The top view which shows the relationship between the state which retracted the optical member from the optical path of the imaging optical axis in an imaging optical system, and an electromagnetic drive source Sectional drawing which shows the magnetic relationship of the shaft member of the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and an electromagnetic drive source Sectional drawing which shows the positional relationship of the shaft member of the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and a magnetic member Sectional drawing which shows the magnetic relationship of the shaft member of the state which retracted the optical member from the optical path of the imaging optical axis in an imaging optical system, and an electromagnetic drive source Sectional drawing which shows the positional relationship of the shaft member of the state which retracted the optical member from the optical path of the imaging optical axis in an imaging optical system, and a magnetic member Sectional drawing which shows the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the magnetic member which concerns on a 1st modification Sectional drawing which shows the state which retracted the optical member from the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the magnetic member which concerns on a 1st modification Sectional drawing which shows the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the magnetic member which concerns on a 2nd modification Sectional drawing which shows the state which retracted the optical member from the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the magnetic member which concerns on a 2nd modification Sectional drawing which shows the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the magnetic member which concerns on a 3rd modification. Sectional drawing which shows the state which retracted the optical member from the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the magnetic member which concerns on a 3rd modification Sectional drawing which shows the state which inserts an optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the 1st convex part which concerns on a 1st reference example Sectional drawing which shows the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the 1st convex part which concerns on a 1st reference example. Sectional drawing which shows the state which inserts an optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the 1st convex part which concerns on a 2nd reference example Sectional drawing which shows the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the 1st convex part which concerns on a 2nd reference example. Sectional drawing which shows the state which inserts an optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the rod body contact | abutted to the optical characteristic change member which concerns on a 3rd reference example Sectional drawing which shows the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the rod body contact | abutted to the optical characteristic change member which concerns on a 3rd reference example The figure which shows the state which inserted the optical member on the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the wing guide which prevents the inclination etc. of the optical characteristic change member which concerns on a 4th reference example The figure which shows the state which retracted the optical member from the optical path of the imaging optical axis in an imaging optical system, and shows the structure of the wing guide which prevents the inclination etc. of an optical characteristic change member

  The present invention will be described below with reference to the drawings. In the drawings used for the following description, the scale of each component is made different in order to make each component recognizable on the drawing. It is not limited only to the quantity of the component described in (1), the shape of the component, the ratio of the size of the component, and the relative positional relationship of each component.

  1 to 13 relate to one aspect of the present invention, FIG. 1 is a diagram showing the overall configuration of the endoscope, and FIG. 2 is a cross-sectional view showing the configuration of the distal end portion of the insertion section along the line II-II in FIG. 3 is an exploded perspective view showing the configuration of the optical unit as the optical device, FIG. 4 is a perspective view showing the configuration of the optical unit as the optical device, FIG. 5 is a side view showing the configuration of the optical unit, and FIG. 5 is a cross-sectional view showing the configuration of the optical unit along the line VI-VI in FIG. 5, FIG. 7 is a plan view showing the configuration of the optical unit in the direction of arrow VII in FIG. 5, and FIG. FIG. 9 is a plan view showing the relationship between the state where the optical member is inserted on the optical path and the electromagnetic drive source, and FIG. 9 shows the relationship between the state where the optical member is retracted from the optical path of the imaging optical axis in the imaging optical system and the electromagnetic drive source. FIG. 10 is a plan view showing an optical member on the optical path of the photographing optical axis in the imaging optical system. FIG. 11 is a sectional view showing the magnetic relationship between the inserted shaft member and the electromagnetic drive source, and FIG. 11 shows the positional relationship between the shaft member and the magnetic member with the optical member inserted on the optical path of the imaging optical axis in the imaging optical system. FIG. 12 is a sectional view showing the magnetic relationship between the shaft member and the electromagnetic drive source in a state where the optical member is retracted from the optical path of the imaging optical axis in the imaging optical system, and FIG. 13 is the imaging optical axis in the imaging optical system. It is sectional drawing which shows the positional relationship of the shaft member of the state which retracted | retracted the optical member from the optical path of, and a magnetic member.

  As shown in FIG. 1, an endoscope 1 includes an insertion portion 2 that is inserted into a subject, an operation portion 3 that is connected to the proximal end side of the insertion portion 2, and extends from the operation portion 3. The universal cord 8 and the connector 9 provided at the extended end of the universal cord 8 are provided. The endoscope 1 is electrically connected to an external device (not shown) such as a control device or a lighting device via a connector 9.

  The operation section 3 is provided with an up / down bending operation knob 4 for bending the bending section 12 of the insertion section 2 in the up / down direction and a left / right bending operation knob 5 for bending the bending section 12 in the left / right direction.

  Further, the operation unit 3 is provided with a fixed lever 6 that fixes the turning position of the up / down bending operation knob 4 and a fixing knob 7 that fixes the turning position of the left / right bending operation knob 5.

  The insertion portion 2 has a distal end portion 11, a bending portion 12, and a flexible tube portion 13 connected in order from the distal end side, and is formed in an elongated shape so that it can be easily inserted into a subject.

  The bending portion 12 is bent in, for example, four directions, up, down, left, and right, by the turning operation of the up / down bending operation knob 4 and the left / right bending operation knob 5, thereby providing an imaging unit 30 described later provided in the distal end portion 11. The observation direction can be changed, and the insertability of the tip 11 in the subject can be improved.

  As shown in FIG. 2, a distal end hard member 20 is provided in the distal end portion 11 of the insertion portion 2, and an imaging unit 30 that images the inside of the subject is fixed to the distal end hard member 20.

  In addition to the imaging unit 30, the distal end rigid member 20 is supplied with illumination light into the subject inserted through the connector 9, the universal cord 8, the operation unit 3 and the insertion unit 2 shown in FIG. A distal end portion of the light guide (not shown), a distal end portion of the treatment instrument insertion channel 21 for inserting / removing the treatment instrument into / from the subject, and the like are fixed by known fixing means.

  In addition, a fluid supply line (not shown) that supplies fluid to the distal end rigid member 20 to an objective lens 32 as an observation window provided at the forefront of the imaging unit 30 exposed at the distal end surface of the distal end portion 11 of the imaging unit 30. And a supply nozzle (not shown) fixed to the tip portion are fixed by known fixing means.

  Note that the distal end hard member 20 is fitted with a bending piece 22 at the forefront, and a curved rubber 23 is provided so as to cover the outer peripheral portion of the distal end hard member 20 from a plurality of bending pieces connected in a freely rotatable manner. It is arranged. Further, the distal end hard member 20 is provided with a distal end cover 24 so as to cover the distal end surface.

  The imaging unit 30 has a lens frame 31 on the distal end side. In the lens frame 31, an objective lens 32 serving as the above-described observation window as an optical member constituting the imaging optical system (optical system), and the objective lens. A diaphragm 33 provided on the back surface of the lens 32 is held along the photographing optical axis O direction in an objective optical system of the imaging unit 30 described later.

  In the lens frame 31, an optical unit 40 that changes the optical characteristics with respect to the optical path having the photographing optical axis O formed by the objective lens 32 and the diaphragm 33 is disposed.

  An imaging frame 34 is fitted on the base end side of the lens frame 31. In the imaging frame 34, an image sensor 35 made of a solid-state imaging device or the like is held via a cover glass 36.

  The position of the cover glass 36 is adjusted to the optical glass 37 held by the imaging frame 34 and fixed by an optical adhesive or the like. In the imaging frame 34, an electric board 38 on which a plurality of electronic components are mounted is disposed on the base end side of the image sensor 35.

  A signal cable 39 for supplying various driving signals to the image sensor 35 and transmitting an image signal acquired by the image sensor 35 is connected to the electric board 38.

  In addition, the heat contraction tube 25 is provided in the front-end | tip part of the signal cable 39 from the middle of the imaging frame 34 so that each outer peripheral part may be covered. In the portion covered with the heat shrinkable tube 25, a filler such as an adhesive is disposed to maintain watertightness.

  A drive cable 39a is branched from the signal cable 39. The drive cable 39a is electrically connected to the optical unit 40 via the FPC 41 in which a wiring pattern is formed along the outer surface of the imaging frame 34. It is connected.

  Thereby, for example, a driving current is supplied to the optical unit 40 from a power supply control unit provided in the light source device or the like in response to an operation input of switches provided in the endoscope 1 by an operator or the like. The

Here, the optical unit 40 which is the optical device of the present embodiment will be described in detail below.
As shown in FIG. 3, the optical unit 40 includes a housing 50 as a shaft holding member, an optical property changing member 60 that is rotatably held by the housing 50, and an electromagnetic drive source that rotates the optical property changing member 60. 80.

  As shown in FIGS. 4 and 5, the housing 50 includes a first substrate 51 and a second substrate 52 disposed so as to face each other. The first and second substrates 51 and 52 are constituted by flat members having an external shape in which the circular portions 51a and 52a and the rectangular portions 51b and 52b are integrated.

  As shown in FIG. 3, the first and second substrates 51 and 52 are provided with openings 51c and 52c that open in correspondence with the optical path of the imaging optical system in the center of the circular portions 51a and 52a. Yes.

  In addition, the second substrate 52 is provided with two magnetic body installation holes 52e that are offset from the second bearing hole 52d toward the edge of the circular portion 52a.

  Further, the first and second substrates 51 and 53 have first convex portions 54a, which are substantially L-shaped at positions offset to the opposite sides with respect to the rectangular portions 51b and 53b on the circular portions 51a and 53a. 55a is erected, and second convex portions 54b and 55b that are substantially I-shaped are erected at positions offset to the opposite sides with respect to the circular portions 51a and 53a on the rectangular portions 51b and 53b. .

  The second substrate 52 is provided with an arc-shaped first spacer 56a erected along the edge of the circular portion 52a at a position offset on the opposite side to the rectangular portion 52b on the circular portion 52a. A second spacer 56b having a substantially I shape is erected at a position offset on the opposite side to the circular portion 52a on the rectangular portion 52b.

  The first and second substrates 51 and 52 are connected via the first and second convex portions 54a and 54b of the first substrate 51, so that the housing 50 stacked so as to be hollow is formed. It is configured. That is, the first and second convex portions 54 a and 54 b of the first substrate 51 constitute a spacer for the second substrate 52.

  In the connected state in which the first and second substrates 51 and 52 are stacked, the openings 51c and 52c are formed so that the hole axes coincide with each other so as to overlap each other. Similarly, in the connected state in which the first and second substrates 51 and 52 are stacked, the first and second bearing holes 51d and 52d have the same hole axis on one axis so as to overlap each other. It is formed as follows.

  The optical property changing member 60 includes a shaft member 61, a honey member 62 that is an optical holding member, and an annular optical holding frame 63 that holds an optical member 64 such as a lens or an optical filter here. Has been. The optical member 64 is described here as a lens, an optical filter, or the like, but may be a diaphragm blade or the like.

  The shaft member 61 is composed of a permanent magnet having a substantially cylindrical shape in which an S pole as a first magnetic pole and an N pole as a second magnetic pole are magnetized in an axisymmetric manner. That is, the shaft member 61 is polarized into two magnetic poles, the S pole and the N pole, in a direction orthogonal to the axial direction parallel to the optical axis direction.

  The shaft member 61 is inserted into the first and second bearing holes 51d and 52d of the first and second substrates 51 and 52 of the housing 50 so as to be rotatable about the same axis. ing.

  That is, in the shaft member 61, since the first and second bearing holes 51d and 52d have the hole shaft on one shaft, the shaft center is arranged on one shaft and the shaft centers are the same. It is arranged on the axis.

  The optical property changing member 60 is sandwiched between the first and second substrates 51 and 52 in the state of being disposed in the housing 50, and the shaft member 61 is the first and first substrates. 2 is prevented from falling off the bearing holes 51d and 52d.

  Further, the honey member 62 has an arm portion 62a whose one end is pivotally attached to the shaft member 61 by bonding or the like, and an optical holding portion 63 to which an optical holding frame 63 holding the optical member 64 is fixed to the other end side of the arm portion 62a. 62b is formed by a flat plate member integrally formed.

  The optical property changing member 60 configured as described above is disposed in the housing 50 so as to be rotatable around the central axis of the shaft member 61.

The optical property changing member 60 is disposed on the first substrate 51 in the space where the spring member 62 is formed between the first and second substrates 51 and 52.
As shown in FIGS. 6 to 8, the optical unit 40 configured as described above is the first insertion position where the optical member 64 of the optical property changing member 60 is on the optical path of the imaging optical axis O of the imaging optical system. It rotates about the center axis of the shaft member 61 to a first stationary position or a second stationary position as a retracted position deviating from the optical path of the imaging optical axis O of the imaging optical system as shown in FIG.

  In the optical property changing member 60, the S pole as the first magnetic pole of the shaft member 61 and the N pole as the second magnetic pole are shifted by a predetermined angle around the axis with respect to the spring member 62. It is attached to the shaft.

  As shown in FIG. 3 or FIG. 7, the electromagnetic drive source 80 includes, for example, a base member 82 fixed on the second substrate 52, and first and first members connected to each end of the base member 82, respectively. The second core arms 83 and 84 have a yoke 81 formed of an integral magnetic body.

  In the present embodiment, the electromagnetic drive source 80 is disposed on the second substrate 52, and the base member 82 of the yoke 81 is second on the outer surface of the circular portion 52 a of the second substrate 52 with the opening 52 c interposed therebetween. Is fixed at a position on the bearing hole 52d side.

  Each end portion of the base member 82 is provided with first and second connecting portions 82a and 82b that are formed to be narrower than other portions, and the first and second connecting portions 82a and 82b include The proximal ends of the first and second core arms 83 and 84 are connected to each other.

  The first and second core arms 83 and 84 extend toward the second bearing hole 52 d along the surface of the second substrate 52. The first and second electromagnetic coils 85 and 86 are formed on the outer peripheral portions of the first and second core arms 83 and 84 by sequentially winding a series of windings.

  The first and second core arms 83 and 84 and the first and second electromagnetic coils 85 and 86 constitute first and second electromagnets 87 and 88, respectively. In addition, on the distal end sides of the first and second electromagnets 87 and 88, the distal ends of the first and second core arms 83 and 84 protrude as first and second core heads 83a and 84a.

  The first and second core heads 83a and 84a face the side portion (outer peripheral portion) of the shaft member 61 protruding upward from the second bearing hole 52d of the second substrate 52 (FIGS. 5 and 5). 7).

The first and second electromagnetic coils 85 and 86 are wound in the same direction (for example, clockwise) so as to generate magnetic fields in different directions.
For example, when a predetermined positive current is supplied to the electromagnetic drive source 80, the first electromagnetic coil 85 generates a magnetic field that magnetizes the first core head 83a side to the S pole, which is the first magnetic pole, The second electromagnetic coil 86 generates a magnetic field that magnetizes the second core head 84a side to the N pole as the second magnetic pole.

  On the other hand, for example, when a predetermined negative current is supplied to the electromagnetic drive source 80, the first electromagnetic coil 85 generates a magnetic field that magnetizes the first core head 83a side to the N pole that is the second magnetic pole. The second electromagnetic coil 86 generates a magnetic field that magnetizes the second core head 84a side to the S pole that is the first magnetic pole.

As described above, the electromagnetic drive source 80 switches the magnetic field by switching the first and second core heads 83a to the S pole as the first magnetic pole or the N pole as the second magnetic pole, thereby switching the magnetic field. The optical property changing member 60 is rotated by a change in magnetic force that acts magnetically on the shaft member 61 of the optical property changing member 60.
The first and second core heads 83a and 84a generate magnetic fields in different directions, and sandwich the shaft member 61 in a direction perpendicular to the axis of the shaft member 61 of the optical property changing member 60, respectively. Opposed. In other words, the first and second core heads 83 a and 84 a generate a magnetic field so as to sandwich the shaft member 61 in a direction orthogonal to the axis of the shaft member 61, and whether the current supplied to the electromagnetic drive source 80 is positive or negative By switching, the magnetic field direction is switched to the opposite direction.

  Returning to FIG. 3, the two magnetic body installation holes 52e formed in the second substrate 52 have two second members formed from a metal round bar-like iron having a predetermined length as a rotation holding member. The first and second magnetic members 71 and 72 are respectively inserted and fixed.

  The first and second magnetic members 71 and 72 are provided with outward flanges 71a and 72a at one end, and the outward flanges 71a and 72a are applied to one surface of the second substrate 52 as shown in FIG. Bonded and fixed in contact.

  That is, the first and second magnetic members 71 and 72 are opposed to the first substrate 51 in the space formed between the first and second substrates 51 and 52 as shown in FIG. The second substrate 52 is provided so as to protrude from the other surface.

  In the optical unit 40 of the present embodiment configured as described above, the first and second convex portions 54a and 54b constituting the housing 50 are stoppers that restrict the rotation of the spring member 62 of the optical property changing member 60. As a function.

  That is, when the optical property changing member 60 is rotated to the first stationary position side, the optical holding portion 62b of the spring member 62 contacts the first convex portion 54a, so that the optical member 64 is in a predetermined position. Stop at the first stationary position so that it stops.

  As a result, in the honey member 62, the optical holding portion 62b is brought into contact with the first convex portion 54a and the rotation of the optical holding portion 62b in one direction around the shaft member 61 is restricted. Are positioned so as to overlap with the openings 51c and 52c.

  That is, the honeycomb member 62 is positioned at a first stationary position as an insertion position for inserting the optical member 64 on the optical path of the photographing optical axis O (see FIGS. 6 to 8).

  On the other hand, when the optical property changing member 60 is rotated to the second stationary position side, the optical holding portion 62b of the honey member 62 comes into contact with the second convex portion 54b, thereby becoming the second retracted position. Stop at rest position.

  As a result, in the spring member 62, the optical holding portion 62b is in contact with the second convex portion 54b and the rotation around the shaft member 61 in the other direction is restricted, and the optical holding portion 62b is moved to the rectangular portions 51b and 52b side. It is positioned at the position to be arranged.

  That is, the honey member 62 is positioned at the second stationary position as a retracted position for retracting the optical member 64 from the optical path of the photographing optical axis O (see FIG. 9).

  Here, the positional relationship between the magnetic field of the electromagnetic drive source 80 and the optical property changing member 60 will be described in detail below.

  When the optical member 64 is in the first stationary position as the insertion position, the optical property changing member 60 is configured such that the magnetized N pole side of the shaft member 61 faces the first core head 83a and the first shaft member 61 is set such that the magnetized S pole side faces the second core head 84a (see FIG. 8).

  On the other hand, when the optical member 64 is in the second stationary position as the retracted position, the optical property changing member 60 is opposed to the first core head 83a while the magnetized S pole side of the shaft member 61 is opposed to the first core head 83a. The magnetized N pole side of the shaft member 61 is set so as to face the second core head 84a (see FIG. 9).

The operation of the optical unit 40 of the present embodiment configured as described above will be described in detail below.
First, the optical unit 40 is provided in an external device such as a light source device when the optical member 64 of the optical property changing member 60 is moved to a first stationary position as an insertion position for insertion on the optical path of the photographing optical axis O. A positive drive current is supplied from the power supply controller to the magnetic drive source 80 to excite the first and second electromagnetic coils 85 and 86, and the first core head 83a side is magnetized to the S pole. Then, the second core head 84a side is magnetized to the N pole (see FIG. 10).

  In other words, the optical property changing member 60 has an attractive force acting on the N pole of the shaft member 61 facing the first core head 83a by the magnetic field generated from the first core head 83a magnetized to the S pole, and the N pole. By the magnetic field generated from the second core head 84a, the attractive force acting on the south pole of the shaft member 61 facing the second core head 84a is received, and rotational force is applied in the direction of the first stationary position.

  Then, when the optical property changing member 60 rotates in the first stationary position direction, the spring member 62 pivotally attached to the shaft member 61 comes into contact with the first convex portion 54a, and the shaft member 61 rotates around the axis of the shaft member 61. Is restricted. Thus, the optical property changing member 60 is displaced to the first stationary position as the insertion position where the optical member 64 is inserted on the optical path of the photographing optical axis O.

  Thus, in the optical unit 40, when the optical property changing member 60 is displaced to the first stationary position, the amount of drive current supplied to the electromagnetic drive source 80 from the power supply control unit provided in the external device such as the light source device is increased. Reduced or stopped.

  The variable drive current may be a timer control that reduces or stops the supply amount of the drive current after a predetermined time has elapsed by the power supply control unit. For example, a surgeon or the like may control a predetermined switch of the operation unit 3. The supply amount of the drive current may be reduced or stopped by an operation input.

  At this time, the optical property changing member 60 is generated between the first and second magnetic members 71 and 72, in particular, between the first magnetic member 71 and the shaft member 61 facing each other by a predetermined distance. Therefore, the rotation is restrained by the attractive force to be held.

  Specifically, the optical property changing member 60 is such that the magnetized N pole side of the shaft member 61 is the first in the state in which the honeycomb member 62 is in contact with the first convex portion 54a and is displaced to the first stationary position. The magnetic member 71 is separated from the magnetic member 71 by a predetermined distance.

  In this state, the peak of the magnetic field on the N pole side formed by the shaft member 61 passes through the center (axial center) O1 of the shaft member 61 as shown in FIG. The direction of the imaginary line a indicated by the alternate long and short dash line passing through the center of the region magnetized in the direction of. That is, the shaft member 61 generates the largest magnetic force at the center of the region magnetized to the N pole in the cross-sectional direction.

  The first magnetic member 71 has an axis when the optical characteristic changing member 60 is displaced toward the first stationary position with respect to the peak direction of the magnetic field whose center (axial center) O2 is indicated by the phantom line a. In the direction around the axis of the member 61, for example, it is provided at a position having a predetermined angle θ that is greater than 0 ° and 20 ° or less (0 ° <θ ≦ 20 °).

  That is, the first magnetic member 71 passes through the center (axial center) O1 of the shaft member 61, and is predetermined in the direction around the axis of the shaft member 61 when the optical property changing member 60 is displaced toward the first stationary position. Are arranged such that the center (axial center) O2 is positioned on an imaginary line b indicated by a one-dot chain line having an angle θ (0 ° <θ ≦ 20 °).

  As described above, the shaft member 61 receives the attractive force generated between the first magnetic member 71 and the first stationary position due to the direction of the peak of the magnetic field on the N pole side with respect to the position of the first magnetic member 71. The rotational force F is generated in the direction in which the optical property changing member 60 is displaced to the side.

  As a result, in the optical property changing member 60, the amount of drive current supplied to the electromagnetic drive source 80 is reduced or stopped in a state where the spring member 62 is displaced to the first stationary position by contacting the first convex portion 54a. Even when the shaft member 61 receives the attractive force generated between the shaft member 61 and the first magnetic member 71, the rotating force F in the direction in which the optical characteristic changing member 60 is displaced toward the first stationary position side is always generated and stationary. It becomes.

  The optical property changing member 60 is generated between the shaft member 61 and the second magnetic member 72 in a state where the spring member 62 is in contact with the first convex portion 54a and displaced to the first stationary position. Even from the weak attractive force, the rotational force F in the direction in which the optical characteristic changing member 60 is displaced toward the first stationary position is also applied.

  On the other hand, when an operator inputs, for example, a predetermined switch of the operation unit 3 from the state where the optical property changing member 60 is displaced to the first stationary position, a negative current is supplied to the electromagnetic drive source 80. Drive current.

  Thereby, in the electromagnetic drive source 80, the first core head 83a side is magnetized to the N pole, and the second core head 84a side is magnetized to the S pole.

  Then, the optical property changing member 60 has a repulsive force acting on the N pole of the shaft member 61 facing the first core head 83a and a magnetic force on the S pole by the magnetic field generated from the first core head 83a magnetized to the N pole. Due to the magnetic field generated from the second core head 84a, the repulsive force acting on the south pole of the shaft member 61 facing the second core head 84a is received, and rotational force is applied in the second stationary position direction.

  Further, the optical property changing member 60 has the S pole of the shaft member 61 facing the first core head 83a by the magnetic field generated from the first core head 83a magnetized to the N pole as the shaft member 61 rotates. And an attractive force acting on the N pole of the shaft member 61 facing the second core head 84a are given by the magnetic field generated from the second core head 84a magnetized to the S pole.

  The optical property changing member 60 rotates to the second stationary position side as the retracted position where the optical member 64 is out of the optical path of the photographing optical axis O, and the spring member 62 attached to the shaft member is the second. The first shaft member 61 is restricted from rotating around the axis center by contacting the convex portion 54b. Thus, the optical property changing member 60 is displaced to the second stationary position as the retracted position where the optical member 64 is out of the optical path of the photographing optical axis O (see FIG. 12).

  As described above, in the optical unit 40, when the optical property changing member 60 is displaced to the second stationary position, the amount of drive current supplied to the electromagnetic drive source 80 is reduced by timer control or the like by the power supply control unit as described above. Or stopped.

  At this time, the optical property changing member 60 is generated between the first magnetic member 71 and the second magnetic member 72, particularly the second magnetic member 72, in which the shaft member 61 is opposed by a predetermined distance. Therefore, the rotation is restrained by the attractive force to be held.

  Specifically, the optical property changing member 60 is such that the magnetized N pole side of the shaft member 61 is the second in the state in which the honeycomb member 62 is in contact with the second convex portion 54b and displaced to the second stationary position. The magnetic member 72 is opposed to the magnetic member 72 by a predetermined distance.

  In this state, the peak of the magnetic field on the N pole side formed by the shaft member 61 passes through the center (axial center) O1 of the shaft member 61 in the cross-sectional direction of the shaft member 61 as shown above. On the other hand, it becomes the direction of the phantom line a indicated by a one-dot chain line passing through the center of the region magnetized in the N pole, and the center of the region magnetized in the N pole in the cross-sectional direction generates the largest magnetic force.

  The second magnetic member 72 has an axis when the optical characteristic changing member 60 is displaced toward the second stationary position with respect to the peak direction of the magnetic field whose center (axial center) O2 is indicated by the phantom line a. In the direction around the axis of the member 61, for example, it is provided at a position having a predetermined angle θ that is greater than 0 ° and 20 ° or less (0 ° <θ ≦ 20 °).

  That is, the second magnetic member 72 passes through the center (axial center) O1 of the shaft member 61 and is predetermined in the direction around the axis of the shaft member 61 when the optical property changing member 60 is displaced toward the second stationary position. Is arranged such that the center (axial center) O3 is positioned on an imaginary line c indicated by a one-dot chain line having an angle θ (0 ° <θ ≦ 20 °).

  As described above, the shaft member 61 receives the attractive force generated between the second magnetic member 72 and the second stationary position due to the direction of the peak of the magnetic field on the N pole side with respect to the position of the second magnetic member 72. The rotational force F is generated in the direction in which the optical property changing member 60 is displaced to the side.

  As a result, the amount of drive current supplied to the electromagnetic drive source 80 is reduced or stopped in the optical property changing member 60 in a state where the spring member 62 is in contact with the second convex portion 54b and displaced to the second stationary position. However, when the shaft member 61 receives the attractive force generated between the shaft member 61 and the second magnetic member 72, the rotating force F in the direction in which the optical property changing member 60 is displaced toward the second stationary position is always generated and stationary. It becomes.

  The optical property changing member 60 is generated between the shaft member 61 and the first magnetic member 71 in a state where the spring member 62 is in contact with the second convex portion 54b and displaced to the second stationary position. Even from the weak attractive force, the rotational force F in the direction in which the optical property changing member 60 is displaced toward the second stationary position is also applied.

  Further, from the state in which the optical property changing member 60 is displaced to the second stationary position, a positive current is again applied to the electromagnetic drive source 80 by an operator or the like, for example, by an operation input of a predetermined switch of the operation unit 3. When the drive current is supplied, as shown in FIG. 8, the optical characteristic changing member 60 rotates to the first stationary position side, and the optical characteristic changing member 60 is displaced to the first stationary position.

  As described above, the optical unit 40 of the present embodiment moves the optical member 64 of the optical property changing member 60 to the first stationary position or the second stationary position, and then applies the electromagnetic driving source 80 to the electromagnetic driving source 80. Even if the amount of current is reduced or stopped, the spring member 62 is moved to the first convex portion 54a or the second by the attractive force generated between the shaft member 61 and the first and second magnetic members 71 and 72. The state of contact with the convex portion 54b is maintained.

  Therefore, the optical unit 40 can prevent the displacement of the optical member 64 caused by the rotation of the hook member 62 holding the optical member 64 around the axis of the shaft member 61 due to an impact or the like. At this time, in the optical unit 40, since the amount of heat generated by the electromagnetic drive source 80 in which a small amount of current is applied or energized is suppressed and does not become high temperature, the distal end portion of the endoscope 1 becomes high temperature. It is prevented.

  From the above description, the optical unit 40 which is the optical device of the present embodiment has the first stationary position or the photographing optical axis as the entry position where the optical member 64 that changes the optical characteristics enters the optical path of the photographing optical axis O. The second stationary position as the retracted position deviating from the O optical path can be reliably held, and the amount of heat generated by the electromagnetic drive source 80 at that time is suppressed to prevent a high temperature.

(Modification)
Various modifications of the optical unit 40 of the present embodiment will be described below.
The optical unit 40 is not limited to the circular shape of the first and second magnetic members 71 and 72, and various configurations exemplified below can be applied.
14 shows a state in which an optical member is inserted on the optical path of the imaging optical axis in the imaging optical system, a cross-sectional view showing the configuration of the magnetic member according to the first modification, and FIG. 15 shows imaging in the imaging optical system. FIG. 16 is a cross-sectional view showing the configuration of the magnetic member according to the first modification example, with the optical member retracted from the optical path of the optical axis, and FIG. 16 shows the optical member inserted on the optical path of the imaging optical axis in the imaging optical system FIG. 17 is a cross-sectional view illustrating the configuration of the magnetic member according to the second modification example, and FIG. 17 illustrates the state in which the optical member is retracted from the optical path of the imaging optical axis in the imaging optical system, and according to the second modification example. 18 is a cross-sectional view showing the configuration of the magnetic member. FIG. 18 is a cross-sectional view showing the configuration of the magnetic member according to the third modification, showing a state where the optical member is inserted on the optical path of the imaging optical axis in the imaging optical system. Is an optical member from the optical path of the imaging optical axis in the imaging optical system FIG. 20 is a sectional view showing the configuration of the magnetic member according to the third modification, showing the retracted state, and FIG. 20 shows the state in which the optical member is inserted on the optical path of the imaging optical axis in the imaging optical system. FIG. 21 is a cross-sectional view showing the configuration of the first convex portion according to FIG. 21, and FIG. 21 shows a state where an optical member is inserted on the optical path of the photographing optical axis in the imaging optical system, and the first convex portion according to the first reference example. FIG. 22 is a cross-sectional view showing the configuration, FIG. 22 is a cross-sectional view showing the configuration of the first convex portion according to the second reference example, showing a state in which an optical member is inserted on the optical path of the imaging optical axis in the imaging optical system, and FIG. FIG. 24 shows a state in which an optical member is inserted on the optical path of the imaging optical axis in the imaging optical system, and is a sectional view showing the configuration of the first convex portion according to the second reference example. FIG. 24 shows the imaging optical axis in the imaging optical system. The optical member is inserted in the optical path of the optical characteristic changing member according to the third reference example. FIG. 25 is a cross-sectional view showing the configuration of a bar body in contact with the optical member, and FIG. 25 shows a state in which an optical member is inserted on the optical path of the imaging optical axis in the imaging optical system. FIG. 26 is a sectional view showing the configuration, and FIG. 26 shows a state in which an optical member is inserted on the optical path of the imaging optical axis in the imaging optical system, and the configuration of the wing guide for preventing the inclination of the optical characteristic changing member according to the fourth reference example. FIG. 27 is a diagram showing a configuration of a wing guide that shows a state in which the optical member is retracted from the optical path of the imaging optical axis in the imaging optical system and prevents the optical characteristic changing member from being inclined.

(First modification)
As shown in FIGS. 14 and 15, the first and second magnetic members 73 and 74 are separated from the rod body having a rectangular cross section by a predetermined distance from the outer peripheral surface of the shaft member 61. Thus, arc surfaces 73c and 74c are formed on the opposing surfaces. These circular arc surfaces 73c and 74c have a common center with the center O1 of the shaft member 61, and the curvature along the outer peripheral surface of the shaft member 61 is set.

  By adopting such a configuration, the optical unit 40 has more attractive force generated between the shaft member 61 and the first and second magnetic members 73 and 74, so that the first and second stationary position sides are increased. The rotational force F in the direction in which the optical property changing member 60 is displaced also increases.

  As a result, the optical unit 40 moves the optical member 64 of the optical property changing member 60 to the first stationary position or the second stationary position, and then reduces or stops the amount of current to the electromagnetic drive source 80. Even when the shaft member 61 is in contact with the first convex portion 54a or the second convex portion 54b by the attractive force generated between the first and second magnetic members 73 and 74. Is more firmly held.

(Second modification)
As shown in FIGS. 16 and 17, the first and second magnetic members 75 and 76 here have flat surfaces 75c and 76c facing the outer peripheral surface of the shaft member 61 with a predetermined distance therebetween. This is a rod having a rectangular cross section.

  These flat surfaces 75c and 76c pass through the center (axial center) O1 of the shaft member 61 and are predetermined in the direction around the shaft center of the shaft member 61 when the optical property changing member 60 is displaced toward the first and second stationary positions. Are perpendicular to the imaginary lines b and c indicated by the one-dot chain line having the angle θ (0 ° <θ ≦ 20 °).

  Even in such a configuration, the shaft member 61 can increase the attractive force generated between the first and second magnetic members 75 and 76, and the optical characteristic changing member toward the first and second stationary positions. The rotational force F in the direction in which 60 is displaced also increases.

  As a result, the optical unit 40 of this modification also reduces the amount of current to the electromagnetic drive source 80 after moving the optical member 64 of the optical property changing member 60 to the first stationary position or the second stationary position. Even if it stops or stops, it becomes the structure by which the state which the honey member 62 contact | abutted to the 1st convex part 54a or the 2nd convex part 54b is hold | maintained more firmly.

(Third Modification)
As shown in FIGS. 18 and 19, the first and second magnetic members 77 and 78 here have flat surfaces 77c and 78c that face the outer peripheral surface of the shaft member 61 with a predetermined distance therebetween. This is a rod having a triangular cross section.

  These planes 77c and 78c also pass through the center (axial center) O1 of the shaft member 61 and the axis when the optical characteristic changing member 60 is displaced toward the first and second stationary positions, as in the second modification. The member 61 is orthogonal to the imaginary lines b and c indicated by a one-dot chain line having a predetermined angle θ (0 ° <θ ≦ 20 °) in the direction around the axis of the member 61.

  Even in such a configuration, the optical unit 40 moves the optical member 64 of the optical property changing member 60 to the first stationary position or the second stationary position, and then performs electromagnetic driving, as in the second modification. Even if the amount of current to the source 80 is reduced or stopped, the state in which the honeycomb member 62 is in contact with the first convex portion 54a or the second convex portion 54b is more firmly maintained.

(Reference example)
Various reference examples of the optical unit 40 of the present embodiment will be described below.
(First reference example)
As shown in FIGS. 20 and 21, the optical unit 40 is provided with first and second flat portions 55a and 55b that form V-shaped concave portions on the side surfaces of the first convex portions 54a. As the insertion position for inserting the optical member 64 on the optical path of the photographing optical axis O, the outer peripheral portion of the optical holding portion 62b of the spring member 62 of the optical property changing member 60 abuts on the second plane portions 55a and 55b. You may make it make it stop still reliably in a 1st stationary position.

  That is, the first and second flat portions 55a and 55b have a function as a stopper for restricting the rotation of the honey member 62 of the optical property changing member 60.

  With such a configuration, when the optical property changing member 60 is displaced to the first stationary position side, first, the outer peripheral portion of the optical holding portion 62b of the honey member 62 hits the first flat portion 55a, The optical member 64 is guided to a predetermined position while being in contact with the first flat surface portion 55a and is in contact with the second flat surface portion 55b, thereby preventing the optical member 64 from being displaced.

(Second reference example)
Further, as shown in FIGS. 22 and 23, the optical unit 40 is provided with a curved surface 56 that forms an arc-shaped concave portion on the side surface of the first convex portion 54a. The optical member 64 may be surely stopped at the first stationary position by contacting the outer peripheral portion of the optical holding portion 62b of the member 62.

  The curved surface 56 has a circular arc shape having a radius of curvature larger than the radius of curvature of the outer peripheral portion of the optical holding portion 62b. Here, the curved surface 56 serves as a stopper for restricting the rotation of the spring member 62 of the optical property changing member 60.

  Even in such a configuration, when the optical property changing member 60 is displaced to the first stationary position side, the optical member 64 is determined while the outer peripheral portion of the optical holding portion 62b of the honey member 62 is in contact with the curved surface 56. The optical member 64 can be prevented from being displaced by being guided to a predetermined position.

(Third reference example)
As shown in FIGS. 24 and 25, the optical unit 40 is provided with two rod bodies 57a and 57b in front of the first convex portion 54a, and an optical characteristic changing member is provided on the two rod bodies 57a and 57b. The optical member 64 may be surely stopped at the first stationary position by abutting the outer peripheral portion of the optical holding portion 62b of the 60 spring member 62.

(Fourth reference example)
Further, as shown in FIGS. 26 and 27, the optical unit 40 is arranged along the inclination of the optical property changing member 60 and the photographing optical axis O in a space formed between the first substrate 51 and the second substrate 52. A plate-like wing guide 58 is provided between the first and second convex portions 54a and 54b to suppress the deviation of the direction.

  In the optical unit 40, the optical property changing member 60 is displaced between the first and second stationary positions so that the upper surface of the edge portion of the optical holding portion 62 b of the honey member 62 is held by the wing guide 58.

  In other words, the wing guide 58 is located between the first substrate 51 and the second substrate 52 in the direction along the photographing optical axis O, with respect to the first substrate 51, rather than the thickness of the optical holder 62 b. It is arranged with a slightly larger predetermined clearance.

Since the optical unit 40 is provided with the wing guide 58, the wing guide 58 regulates even if the optical property changing member 60 tries to move in the direction along the photographing optical axis O. A shift in the direction along the photographing optical axis O can be prevented.

  Further, when the optical member 64 is a lens, a filter, or the like, it does not come into contact with the second substrate 52, so that no cracks, chips, etc. occur.

  In addition, this invention is not limited to each embodiment described above, A various deformation | transformation and change are possible, and they are also in the technical scope of this invention. For example, it goes without saying that the configurations of the above-described embodiments may be appropriately combined.

  In the above-described embodiment, an example in which a lens, an optical filter, a diaphragm, and the like are inserted into and removed from the optical path of the optical system as the optical member has been described. However, the present invention is not limited to this example. The structure which inserts / removes etc. may be sufficient.

  The optical system to which the present invention is applied is not limited to the imaging optical system, and can be applied to, for example, an illumination optical system that irradiates illumination light to a subject or the like.

  In each of the above embodiments, the S pole is described as the first magnetic pole, and the N pole as the second magnetic pole. However, the correspondence between the first and second magnetic poles may be reversed. Of course.

DESCRIPTION OF SYMBOLS 1 ... Endoscope 2 ... Insertion part 3 ... Operation part 4 ... Up / down bending operation knob 5 ... Left / right bending operation knob 6 ... Fixed lever 7 ... Fixed knob 8 ... Universal cord 9 ... Connector 11 ... Tip part 12 ... Bending part DESCRIPTION OF SYMBOLS 13 ... Flexible pipe part 20 ... Hard tip member 21 ... Treatment instrument insertion channel 22 ... Curve piece 23 ... Curve rubber 24 ... End cover 25 ... Heat shrinkable tube 30 ... Imaging unit 31 ... Lens frame 32 ... Objective lens 34 ... Imaging frame 35 ... Image sensor 36 ... Cover glass 37 ... Optical glass 38 ... Electric substrate 39 ... Signal cable 39a ... Drive cable 40 ... Optical unit 50 ... Housing 51 ... First substrate 52 ... Second substrates 51a, 52a ... Circular portion 51b, 52b ... Rectangular portions 51c, 52c ... Openings 51d, 52d ... Bearing holes 52e ... Magnetic body installation holes 54a ... First convex portion 54b ... Second convex portion 60 ... Optical Sex change member 61 ... shaft member 62 ... spring member 62a ... arm part 62b ... optical holding part 63 ... optical holding frame 64 ... optical member 71 ... first magnetic member 72 ... second magnetic members 71a, 72a ... outward flange 80 ... Electromagnetic drive source 85 ... first electromagnetic coil 86 ... second electromagnetic coil 87 ... first electromagnet 88 ... second electromagnet F ... rotational power O ... photographing optical axis θ ... angles O1, O2, O3 ... center

Claims (7)

A shaft member made of a permanent magnet polarized in two magnetic poles in a direction perpendicular to the axial direction, an optical holding member pivotally attached to the shaft member, and an optical member held by the optical holding member; An optical property changing member that is freely displaceable to a first stationary position that enters the optical path of the optical system and a second stationary position that retreats from the optical path.
An electromagnetic drive having an electromagnet capable of generating a magnetic field acting on the magnetic pole of the shaft member, and displacing the optical property changing member to the first stationary position or the second stationary position by switching the magnetic field by the electromagnet The source,
After the optical property changing member is displaced to the first stationary position or the second stationary position, the amount of driving current supplied to the electromagnetic driving source is set apart from the shaft member by a predetermined distance. In a reduced or stopped state, a magnetic member that receives an attractive force due to the magnetic field of the shaft member and holds the stationary state of the optical property changing member;
An optical apparatus comprising:   The first stop position includes a first stopper that contacts the optical holding member and restricts rotation so that the optical member stops at a predetermined position on the optical path. The optical device according to claim 1.   In the second stationary position, there is provided a second stopper that abuts on the optical holding member and restricts the rotation so that the optical member stops at a predetermined position out of the optical path. The optical device according to claim 1 or 2.   In the state in which the optical property changing member is displaced to the first stationary position, the magnetic member has the optical property changing member at least toward the first stationary position with respect to the peak direction of the magnetic field of the shaft member. The optical apparatus according to any one of claims 1 to 3, wherein the optical apparatus is provided at a position having a predetermined angle in a direction around the axis of the shaft member when displaced.   In a state where the optical property changing member is displaced to the second stationary position, the magnetic member is further displaced toward the second stationary position side with respect to the peak direction of the magnetic field of the shaft member. The optical device according to claim 4, wherein the optical device is provided at a position having a predetermined angle in a direction around the axis of the shaft member. The electromagnetic drive source includes two core heads that switch the direction of the magnetic field in the reverse direction by switching the current between positive and negative,
The said two core heads are each opposingly arranged so that the said shaft member may be pinched | interposed in the direction orthogonal to the axial center of the said shaft member. An optical device according to 1.   An endoscope comprising the optical device according to any one of claims 1 to 6 at a distal end portion of an insertion portion.

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