JP2015181913A - Optical unit and endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical unit which enables the optical frame to be smoothly rotated with a small drive force as well as having a configuration capable of achieving downsizing.SOLUTION: An optical unit comprises: a rod-like member 43 rotatable in a circumferential direction C and made from a magnet polarized into two magnetic poles in a direction orthogonal to the axial direction; an electromagnet 140 which includes two coil core heads 40a, 40b arranged axisymmetrically relative to the rod-like member 43 and giving magnetic force to the rod-like member 43, and which when supplied with electric power to make the two coil core heads 40a, 40b polarized differently with each other, rotates the rod-like member 43 by repulsive force or stops the rotation of the rod-like member 43 by attractive force; and an optical frame 130 which movably supports the rod-like member 43 in the axial direction J of the rod-like member 43 while rotating integrally with the rod-like member 43 in the circumferential direction C.

Description

The present invention relates to an optical apparatus and an endoscope used when observing a subject.

In recent years, in an observation device such as an endoscope, an imaging unit provided in the observation device is required to be downsized as the observation device is downsized.

Here, an optical frame used in the imaging unit, for example, a lens frame including a lens for changing magnification, is arranged with the first position on the observation optical axis and the observation light by a gear provided in the imaging unit meshing with the lens frame. It is well known that it is configured to be movable between a second position retracted from the axis. However, in this configuration, there is a problem that it is difficult to reduce the size of the imaging unit because gears or the like are used for moving the lens frame.

Therefore, in Patent Document 1, a diaphragm member that forms an optical frame between two circular substrates that are spaced apart from each other in the optical axis direction and have the same outer diameter has openings on the observation optical axis of each substrate. A configuration is disclosed in which the two substrates are pivotally supported so as to be movable by a rotation to a first position overlapping with the second position and a second position retracted from the opening. Further, Patent Document 1 discloses a configuration of an optical device in which a diaphragm member is fixed and positioned on a rod-shaped member made of a magnet polarized into two magnetic poles.

Further, in the optical device disclosed in Patent Document 1, when the optical device is viewed in plan from the optical axis direction on one substrate, it is positioned so as to sandwich the rod-shaped member, and magnetic force is applied to the rod-shaped member with the supply of electric power. There is disclosed an arrangement in which an electromagnet having two magnetic parts is provided, and the throttle member is rotated by rotating the rod-shaped member by the magnetic force.

Furthermore, in the optical device disclosed in Patent Document 1, it is not necessary to use a gear or the like because magnetic force is used to move the diaphragm member, and the electromagnet and the rod-like member are obtained by viewing the optical device in plan view from the optical axis direction. At this time, they are provided so as to overlap each substrate, that is, without protruding from the outer shape of each substrate, and the diaphragm member is also moved within the outer shape of each substrate. As a result, the outer diameter of the optical device can be defined by the outer diameter of each substrate, so that the optical device can be downsized.

Therefore, in the configuration of the optical device disclosed in Patent Document 1, if the diaphragm member is replaced with a lens frame including a variable magnification lens, the optical device including the variable magnification lens can be reduced in size as in Patent Document 1. Can be realized.

JP 2009-80470 A

By the way, in the configuration of the optical device disclosed in Patent Document 1, in order to move the diaphragm member from the second position to the first position, for example, each magnetic pole of the rod-shaped member and two different magnetic poles sandwiching the rod-shaped member are used. From the state where two magnetic parts are attracted by attractive force, the magnetic poles of the two magnetic parts are reversed by supplying electric power, and a repulsive force is generated between each magnetic pole of the bar-like member and the two magnetic parts. This is done by rotating in one direction.

However, when the rod-shaped member is rotated, the rod-shaped member moves in the optical axis direction due to repulsive force when rotating between the first position and the second position. That is, the diaphragm member also moves in the optical axis direction. Therefore, there is a problem that a sufficient space for moving the diaphragm member in the optical axis direction must be secured between the substrates, that is, between the diaphragm member and the substrate facing the diaphragm member.

Further, if a sufficient movement space for the diaphragm member is secured between the substrates, there is a problem that the diaphragm member is easily tilted during the movement in the optical axis direction as well as the size of the optical device is increased. Note that the inclination of the throttle member also occurs because the repulsive forces between the rod-shaped member and the two magnetic portions sandwiching the rod-shaped member are not uniform.

Therefore, if the diaphragm member is tilted, a part of the diaphragm member is locally in contact with each substrate, which causes a problem that the diaphragm member is difficult to rotate due to local sliding resistance. There has been a problem that the rotational power of the aperture member must be increased, that is, the power supplied to each magnetic part has to be increased.

The above problem is not limited to the diaphragm member, and the same applies to other optical frames rotated by the optical device. For example, when applied to a lens frame having a variable magnification lens, the lens frame is similarly difficult to rotate, and the lens frame tilts, that is, the optical performance decreases when the lens tilts. There was also a problem such as.

The present invention has been made in view of the above-described problems, and provides an optical apparatus and an endoscope that have a configuration that can smoothly rotate an optical frame with a small driving force and that can realize downsizing. The purpose is to do.

In order to achieve the above object, an optical device according to an aspect of the present invention is a rod-shaped member that is rotatable in the circumferential direction and is configured by a magnet that is polarized into two magnetic poles in a direction orthogonal to the axial direction. The rod-shaped member has two magnetic portions that are provided on the shaft object and apply magnetic force to the rod-shaped member, and the two magnetic portions become magnetic poles different from each other when electric power is supplied. An electromagnet that rotates the rod-shaped member or stops the rotation of the rod-shaped member by an attractive force, and supports the rod-shaped member movably in the axial direction of the rod-shaped member, and is integrated with the rod-shaped member in the circumferential direction. And an optical frame that rotates.

An endoscope according to one aspect of the present invention is provided with the optical device according to any one of claims 1 to 7 in a distal end of an insertion portion to be inserted into a subject.

ADVANTAGE OF THE INVENTION According to this invention, while being able to rotate an optical frame smoothly with a small driving force, the optical apparatus and endoscope which comprise the structure which can implement | achieve size reduction can be provided.

The figure which shows the external appearance of the endoscope which comprises the optical apparatus of 1st Embodiment. 1 is a partial cross-sectional view schematically showing the distal end portion of the insertion portion of the endoscope along the line II-II in FIG. 2 is an exploded perspective view of the optical device of FIG. FIG. 3 is an enlarged perspective view of a rod-shaped member and an optical frame in the optical device of FIG. FIG. 3 is a side view schematically showing the optical device of FIG. 3 assembled from the V direction in FIG. The figure which shows the state which the optical frame of FIG. 3 has stopped in the 2nd position with a rod-shaped member, an electromagnet, and a rotation stopper schematically The figure which shows the cross section of the optical frame of FIG. 6, a rod-shaped member, and an electromagnet with a stopper and a 2nd board | substrate. The figure which shows the state which reversed the magnetic pole of each coil core head in the electromagnet of FIG. 6 with a rod-shaped member, an electromagnet, and a rotation stopper. The figure which shows the cross section of the optical frame of FIG. 8, a rod-shaped member, and an electromagnet with a stopper and a 2nd board | substrate. The figure which shows the state which the optical frame of FIG. 8 rotated to the 1st position has stopped in the 1st position with a rod-shaped member, an electromagnet, and a rotation stopper The figure which shows the cross section of the optical frame of FIG. 10, a rod-shaped member, and an electromagnet with a stopper and a 2nd board | substrate. The perspective view which shows the modification of the shape of the rod-shaped member in the optical apparatus of 2nd Embodiment. The figure which shows schematically the modification which provided the wing guide in the 2nd board | substrate of FIG. 3 with an optical frame, a rotation stopper, and a 2nd board | substrate. The figure which shows the cross section of the optical frame of FIG. 13, a rotation stopper, and a 2nd board | substrate with a stopper stopper and a coil core head. The figure which shows schematically the structure which provided the dust extraction groove | channel in the rotation stopper of the optical frame in a 1st position with a 2nd board | substrate and an optical frame. The figure which shows schematically the modification which provided the dust discharge hole further in the 2nd board | substrate of FIG.

Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram showing an external appearance of an endoscope including the optical device according to the present embodiment, and FIG. 2 is a schematic view of the distal end portion of the insertion portion of the endoscope along the line II-II in FIG. It is a fragmentary sectional view shown.

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 main portion is configured by including the universal cord 8 and the connector 9 provided at the extended end of the universal cord 8. Note that the endoscope 1 is electrically connected to an external device such as a control device or a lighting device via the connector 9.

The operation section 3 is provided with an up / down bending operation knob 4 for bending a bending section 2w (described later) of the insertion section 2 in the up / down direction and a left / right bending operation knob 6 for bending the bending section 2w in the left / right direction.

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

The insertion portion 2 includes a distal end portion 2s, a bending portion 2w, and a flexible tube portion 2k in order from the distal end side, and is formed in an elongated shape.

The bending unit 2w is bent in, for example, four directions, up, down, left, and right, by the turning operation of the up / down bending operation knob 4 or the left / right bending operation knob 6, and the imaging unit 10 described later provided in the distal end portion 2s. The observation direction can be changed, and the insertability of the tip 2s in the subject can be improved. Furthermore, the flexible tube portion 2k is connected to the proximal end side of the bending portion 2w.

As shown in FIG. 2, a distal end hard member 20 is provided in the distal end portion 2s connected to the distal end side of the bending portion 2w, and the imaging unit 10 images the inside of the subject on the distal end hard member 20. Is fixed.

As shown in FIG. 2, the distal end rigid member 20 is irradiated with illumination light into the subject inserted in the connector 9, the universal cord 8, the operation unit 3, and the insertion unit 2 in addition to the imaging unit 10. A distal end side of a light guide (not shown) to be supplied and a distal end side of a treatment instrument insertion conduit 95 for inserting and removing the treatment instrument into and from the subject are fixed by known fixing means. The distal end rigid member 20 is fixed to the distal end side of the fluid supply conduit (not shown) for supplying fluid to an objective lens 17 (described later) exposed at the distal end surface of the distal end portion 2s of the imaging unit 10 and to the distal end side. A supply nozzle or the like (not shown) is fixed by a known fixing means.

As shown in FIG. 2, the imaging unit 10 has a lens frame 12 in which an aperture 16, an objective lens 17, and an optical device 14 are fixed, and a distal end side fixed to the outer periphery of the base end side of the lens frame 12. In addition, a positioning glass 26 is provided with a shield frame 11 fixed inside.

The image pickup unit 10 is attached to the base end face of the positioning glass 26 and a cover glass 27 attached to a light receiving surface formed on the front end face of the image pickup element 28, and the tip end is electrically connected to the image pickup element 28. And a circuit board 63 on which a plurality of electronic components 65 are mounted.

Further, the imaging unit 10 includes a signal cable 29 electrically connected to terminals 63 a and 63 b provided on the base end side of the circuit board 63 via a plurality of signal lines 67, and a rear half portion on the outer periphery of the shield frame 11. And a heat-shrinkable tube 18 that seals the inside of the imaging unit 10 by covering the outer periphery of the signal cable 29 on the front end side. The terminal 63b is electrically connected to the optical device 14 through the flexible substrate 13.

Next, an example of the configuration of the optical device 14 provided in the lens frame 12 will be described with reference to FIGS. 3 is an exploded perspective view of the optical device of FIG. 2, FIG. 4 is an enlarged perspective view of a rod-like member and an optical frame in the optical device of FIG. 3, and FIG. 5 is an assembled view from the direction V in FIG. It is the side view which looked at the optical apparatus of no.

As shown in FIG. 3, the optical device 14 includes a first substrate 45, a second substrate 75, a rod-shaped member 43, an optical frame 130, and an electromagnet 140, and a main part is configured. .

The first substrate 45 has a circular shape in plan view from the optical axis direction L and has a plate-like circular portion 45x and a part of the outer periphery of the circular portion 45x. The main part is comprised from the plate-shaped convex part 45y which protruded in the part.

Further, as shown in FIG. 5, the first substrate 45 has a thickness in the optical axis direction L of the rotation stoppers 36 and 37 described later than the second substrate 75 in the optical axis direction L in the lens frame 12. Only on the objective lens 17 side. That is, the first substrate 45 is located away from the second substrate 75 in the optical axis direction L.

The circular portion 45x and the convex portion 45y are integrally formed. Further, the circular portion 45x and the convex portion 45y have the same thickness in the optical axis direction L.

In the circular portion 45x, an optical opening 45a penetrating along the optical axis direction L is formed, and a rotating shaft hole 45b penetrating along the optical axis direction L is formed. The optical aperture 45a is located on the observation optical axis B in the lens frame 12.

Further, when the circular portion 45x is viewed in plan from the optical axis direction L with respect to the upper surface in FIGS. 3 and 5 that faces the objective lens 17 in the circular portion 45x, L that at least partially overlaps the rotation shaft hole 45b. A stopper 42 that is a letter-shaped movement restricting member is provided. The function of the retaining stopper 42 will be described later.

In the lens frame 12, the second substrate 75 is behind the first substrate 45 in the optical axis direction L, as shown in FIG. 37 are spaced apart by a thickness of 37 in the optical axis direction L.

The second substrate 75 has a circular shape in plan view from the optical axis direction L and has a plate-like circular portion 75x and a radial direction of the second substrate 75 from a part of the outer periphery of the circular portion 75x. The main part is comprised from the plate-shaped convex part 75y which protruded in a part.

The circular portion 75x has the same outer diameter as the circular portion 45x, and the convex portion 75y has the same protruding amount and protruding direction as the convex portion 45y.

That is, the second substrate 75 is formed in the same size and shape as the first substrate 45. The circular portion 75x and the convex portion 75y are integrally formed. Furthermore, the thickness in the optical axis direction L of the circular part 75x and the convex part 75y is the same.

In the circular portion 75x, an optical opening (not shown) penetrating along the optical axis direction L is formed, and a rotation shaft hole 75b penetrating along the optical axis direction L is formed. The optical aperture of the second substrate 75 is located on the observation optical axis B in the lens frame 12. The optical aperture of the second substrate 75 has the same diameter as the optical aperture 45a.

Further, a rotation stopper 37 having a substantially L shape in plan view from the optical axis direction L and having a predetermined thickness in the optical axis direction L is provided between the circular portion 45x and the circular portion 75x in the optical axis direction L. It has been. In FIG. 3, the rotation stopper 37 is provided in the circular portion 75x, but it may be provided in the circular portion 45x.

Further, the rotation is in the vicinity of the projecting end in the projecting direction of the projecting portions 45y and 75y and has a predetermined thickness in the optical axis direction L between the projecting portion 45y and the projecting portion 75y in the optical axis direction L. A stopper 36 is provided.

The thickness of the rotation stopper 36 in the optical axis direction L is equal to the thickness of the rotation stopper 37 in the optical axis direction L. In FIG. 3, the rotation stopper 36 is provided on the convex portion 75y, but it may be provided on the convex portion 45y.

As shown in FIGS. 3 and 5, the optical frame 130 is provided in the gap between the first substrate 45 and the second substrate 75 in the optical axis direction L formed by the rotation stoppers 36 and 37.

The rod-shaped member 43 is rotatable in the circumferential direction C, and is composed of a magnet polarized in two magnetic poles, that is, an S pole and an N pole in a direction perpendicular to the axial direction J parallel to the optical axis direction L. It is elongated in the direction J.

Further, as shown in FIG. 4, the rod-shaped member 43 has a polygonal shape, for example, a hexagonal shape, in a cross section in a direction R orthogonal to the axial direction J. In addition, the cross section in the direction R of the rod-shaped member 43 is not limited to a hexagonal shape, and may be another polygonal shape such as a quadrangular shape.

The optical frame 130 is made of a non-magnetic material, supports the rod-shaped member 43 so as to be movable in the axial direction J, and rotates integrally with the rod-shaped member 43 in the circumferential direction C.

Specifically, the optical frame 130 includes a cylindrical portion 33 and an optical member 131, and a main portion is configured. The cylindrical portion 33 is formed integrally with the optical member 131.

As shown in FIG. 4, the cylindrical portion 33 is formed in an elongated shape in the axial direction J, one end in the axial direction J is closed as a closing portion 33 b, and the opening 33 a is at the other end. The other end of the first substrate 45 and the other end of the first substrate 45 are pivotally supported so as to be rotatable.

The cylindrical portion 33 has a fitting portion 33 i between the closing portion 33 b and the opening portion 33 a in the axial direction J, into which the rod-like member 43 is movably fitted in the axial direction J.

As shown in FIG. 4, the fitting portion 33 i has a polygonal shape, for example, a hexagonal shape, as shown in FIG. In addition, the cross section in the direction R of the insertion part 33i is not limited to a hexagonal shape, and may be another polygonal shape such as a quadrangular shape. Moreover, the cross-sectional shape of the insertion part 33i does not need to correspond with the cross-sectional shape of the rod-shaped member 43, if it is a polygonal shape.

The inner peripheral surface 33in of the insertion portion 33i has a polygonal cross-sectional shape, thereby restricting relative rotation in the circumferential direction C with respect to the rod-like member 43 inserted into the insertion portion 33i. 43 constitutes a rotation restricting portion that abuts in the circumferential direction C.

That is, the corners of the outer periphery 43g of the rod-shaped member 43 having a polygonal cross section are hooked on the corners of the inner peripheral surface 33in of the fitting portion 33i having a polygonal cross section, whereby the rod-shaped member 43 and the cylindrical portion 33, The optical frame 130 can be rotated integrally.

Further, the rod-like member 43 is movable independently in the axial direction J at the fitting portion 33i. Specifically, it is movable in the axial direction J independently from a position where one end abuts against the closing portion 33b of the cylindrical portion 33 to a position where the other end projects from the opening 33a and abuts against the stopper stopper 42. Yes.

Therefore, the stopper stopper 42 is a member that prevents the rod-shaped member 43 from coming off from the fitting portion 33i. That is, the stopper stopper 42 is a member that defines the amount of protrusion J2 (see FIG. 7) from the opening 33a.

Note that the stopper stopper 42 may not be fixed to the first substrate 45 and may be fixed to another member in the lens frame 12 of the imaging unit 10. Further, other members in the lens frame 12 may function as stoppers for preventing the rod-shaped member 43 from coming off.

Further, the shape of the stopper stopper 42 is not limited to the L shape, and may be formed in a cap shape as shown in FIG. 14 to be described later, and the protruding amount J2 of the rod-shaped member 43 from the opening 33a can be defined. Any shape can be used as long as it has a shape.

The optical member 131 is fixed to the cylindrical portion 33 and rotates integrally with the rotation of the cylindrical portion 33, so that the optical member 131 can be inserted into and removed from the observation optical axis B.

Specifically, the optical member 131 is mainly composed of a lens frame 34 and a magnification variable lens (hereinafter simply referred to as a lens) 35.

The lens frame 34 has an annular shape in plan view from the optical axis direction L and has a plate-like annular portion 34x, and a plate-like holding protruding from a part of the outer periphery of the annular portion 34x to a part in the radial direction. The main part is composed of the part 34y.

Since the holding portion 34 y is fixed to the outer periphery of the cylindrical portion 33, the lens frame 34 rotates integrally with the cylindrical portion 33.

The annular portion 34x is formed integrally with the holding portion 34y. Further, the thickness of the annular portion 34x in the optical axis direction L matches the thickness of the holding portion 34y. Further, as shown in FIG. 5, the annular portion 34 x and the holding portion 34 y are formed in a thickness of the rotation stoppers 36 and 37 or less in the optical axis direction L.

The lens frame 34 is in contact with the second substrate 75 in the axial direction J as shown in FIGS. 3 and 5 at the first position and the second position. Is located.

  The lens 35 is fixed to the surface of the annular portion 34x on the first substrate 45 side. The lens 35 is rotated together with the lens frame 34, that is, together with the cylindrical portion 33, so that the lens 35 overlaps the observation optical axis B and is retracted from the observation optical axis B as shown in FIG. It is freely rotatable between the second position.

The first position is defined by the annular portion 34x contacting the side wall of the rotation stopper 37, and the second position is defined by the annular portion 34x contacting the side wall of the rotation stopper 36. .

In addition, the optical member 131 protrudes from the outer shapes of the first substrate 45 and the second substrate 75 by the rotation stoppers 36 and 37 as the rotation between the first position and the second position. There is no.

The electromagnet 140 is fixed to the circular portion 75 x of the second substrate 75. The electromagnet 140 has a substantially U-shaped coil core 39 in plan view from the optical axis direction L, an electromagnetic coil 38 wound around each arm portion of the coil core 39 facing each other, and each coil coil 39 facing each other. Coil core heads 40a and 40b, which are two magnetic parts that apply magnetic force to the rod-shaped member 43, which are provided at the tips of the arm parts, respectively, constitute a main part.

The electromagnet 140 is fixed at a position avoiding the optical opening in the circular portion 75x, and the coil core heads 40a and 40b are viewed in a plan view from the optical axis direction L as shown in FIG. The rod-shaped member 43 is positioned so as to sandwich the rod-shaped member 43 with respect to the axis.

The electromagnet 140 rotates the rod-shaped member 43 by the repulsive force H (see FIG. 8) or the attractive force I (when the electric power is supplied to each electromagnetic coil 38 and the coil core heads 40a and 40b have different magnetic poles. The rotation of the rod-like member is stopped by (see FIG. 6).

Specifically, the electromagnet 140 is configured such that when driving power is supplied to each electromagnetic coil 38 via the signal cable 29 and the flexible substrate 13, specifically, when a predetermined current is applied, the coil core head 40a, By generating magnetism from 40b, the rod-shaped member 43 composed of a magnet is rotated by the repulsive force H.

As a result, when the rod-shaped member 43 is rotated, the optical frame 130 that supports the rod-shaped member 43 is also rotated between the first position and the second position.

Further, as shown in FIG. 7 to be described later, each coil core head 40a, 40b has a central position T1 at which the magnetic force of each coil core head 40a, 40b is maximized at the closing portion 33b of the cylindrical portion 33 in the fitting portion 33i. The rod-shaped member 43 in contact with the rod-shaped member 43 is shifted from the center position T2 where the magnetic force is maximum toward the closing portion 33b.

Thus, in the first position and the second position described above, the rod-shaped member 43 is pressed against the closing portion 33b by the attractive force I between each magnetic pole of the rod-shaped member 43 and each coil core head 40a, 40b. A position in the axial direction J is defined.

At this time, since the rod-shaped member 43 presses the closing portion 33 b, the cylindrical portion 33 is pressed downward in FIG. 5, the lens frame 34 fixed to the cylindrical portion 33 is pressed against the second substrate 75. Therefore, the position of the optical member 131 in the axial direction J is defined at the first position and the second position.

The lens unit 34 is pressed against the second substrate 75 by using the attractive force I. The imaging unit 10 provided in the distal end portion 2s of the insertion portion 2 of the endoscope 1 is shown in FIGS. Thus, since the second substrate 75 does not always take a posture positioned below the gravitational direction, as shown in FIG. 5, there is a design intersection between the lens 35 and the first substrate 45 in the axial direction. Since the gap J1 occurs in J, depending on the posture of the imaging unit 10, the optical member 131 moves away from the second substrate 75 in the axial direction J by the gap J1 in the first position and the second position. This is because the position in the axial direction J of the lens 35 at the first position and the second position is shifted, and the optical performance becomes unstable.

However, as shown in FIG. 4, the cylindrical portion 33 is formed with a closed portion 33 b at one end, so that the rod-shaped member 43 abuts on the closed portion 33 b by the attractive force I and presses the closed portion 33 b. Then, by pressing the lens frame 34 fixed to the cylindrical portion 33 against the second substrate 75, the configuration in which the position of the optical member 131 in the axial direction J can be defined regardless of the orientation of the imaging unit 10. The optical device 14 of the present embodiment has.

On the other hand, when the lens frame 34 is pressed against the first substrate 45 and fixed at the first position and the second position, the positions of the closing portion 33b and the opening portion 33a in the cylindrical portion 33 are set in the axial direction. In FIG. 5, the closed portion 33b is positioned upward in FIG. 5, the opening 33a is positioned downward in FIG. 5, and the center position T1 is closer to the closed portion 33b than the center position T2. If the position of the optical member 131 is shifted to the position of the first substrate 45, the position of the optical member 131 in the axial direction J is reliably set to the first substrate 45 by the attractive force I in the first position and the second position. Can be fixed by pressing.

Next, the operation of moving the lens 35 from the second position to the first position using the optical device described with reference to FIGS. 3 to 5 will be described with reference to FIGS.

6 is a diagram schematically showing the state in which the optical frame of FIG. 3 is stopped at the second position, together with the rod-shaped member, electromagnet, and rotation stopper, and FIG. 7 is the diagram of the optical frame and rod-shaped member of FIG. FIG. 3 is a view showing a cross section of an electromagnet together with a stopper and a second substrate.

8 schematically shows a state in which the magnetic poles of the coil core heads in the electromagnet of FIG. 6 are reversed together with a rod-shaped member, an electromagnet, and a rotation stopper, and FIG. 9 shows the optical frame and rod-shaped of FIG. It is a figure which shows the cross section of a member and an electromagnet with a stopper and a 2nd board | substrate.

Further, FIG. 10 is a view schematically showing a state where the optical frame of FIG. 8 rotated to the first position is stopped at the first position together with the rod-shaped member, the electromagnet, and the rotation stopper. FIG. 11 is a view showing a cross section of the optical frame, rod-shaped member, and electromagnet of FIG. 10 together with a stopper and a second substrate.

First, as shown in FIG. 6, in the state where the optical frame 130 is stopped at the second position, the S pole of the coil core head 40a is in a state where the lens frame 34 is in contact with the rotation stopper 36. The attractive force I between the north pole of the rod-shaped member 43 facing the south pole and the attractive force I between the north pole of the coil core head 40b and the south pole of the rod-shaped member 43 facing the north pole are used. The rotational position is fixed at the second position.

In the second position, as described above, since the center position T1 is shifted from the center position T2 toward the closing portion 33b, as shown in FIG. Since the member 43 presses the closing portion 33b, and the lens frame 34 fixed to the cylindrical portion 33 also presses the second substrate 75, the position of the optical member 131 in the axial direction J is defined.

Next, in order to move the optical frame 130 to the first position, as shown in FIG. 8, when the magnetic poles of each coil core head are reversed from FIG. A repulsive force H is generated between the N pole of 40a and the N pole of the rod-shaped member 43 facing the N pole, and the S pole of the coil core head 40b and the S pole of the rod-shaped member 43 facing the S pole. A repulsive force H is generated in the meantime.

Thereafter, as shown in FIG. 9, due to the repulsive force H, only the rod-shaped member 43 moves in the axial direction J until it comes into contact with the stopper stopper 42. At this time, since the rod-shaped member 43 is not fixed to the cylindrical portion 33, even the optical frame 130 does not move in the axial direction J.

Further, due to the repulsive force H, a rotational force in one direction is applied to the rod-shaped member 43 from each of the coil core heads 40a and 40b. The rotational force of the rod-shaped member 43 is in the direction R of the rod-shaped member 43 as described above. Since the cross section is formed in a polygonal shape and the cross section in the direction R of the fitting portion 33i of the cylindrical portion 33 is also formed in a polygonal shape, the corners of the outer periphery 43g of the rod-shaped member 43 are formed on the inner peripheral surface 33in of the cylindrical portion 33. A rotational force is also applied to the cylindrical portion 33 by being caught by the corner portion. As a result, the optical frame 130 rotates until the lens frame 34 contacts the rotation stopper 37.

At this time, since the optical frame 130 does not move in the optical axis direction L, the optical frame 130 slides and rotates to the first position while the lens frame 34 is in contact with the second substrate 75. .

Finally, in a state where the lens frame 34 is rotated in one direction to the first position where the lens frame 34 contacts the rotation stopper 37, the lens frame 34 is in contact with the rotation stopper 37 as shown in FIG. The attractive force I between the N pole of the coil core head 40a and the S pole of the rod-shaped member 43 facing the N pole, and between the S pole of the coil core head 40b and the N pole of the rod-shaped member 43 facing the S pole The rotation position at the first position of the optical frame 130 is fixed by the attractive force I.

In this first position, as in the second position, the center position T1 is shifted from the center position T2 toward the closing portion 33b, and as shown in FIG. Thus, the rod-shaped member 43 presses the closing portion 33b, so that the lens frame 34 fixed to the cylindrical portion 33 also presses the second substrate 75, so that the position of the optical member 131 in the axial direction J is defined. .

The above operation is the same even when the optical frame 130 is rotated in the other direction from the first position to the second position.

As described above, in the present embodiment, the rod-like member 43 formed of the magnet to which the magnetic force is applied from each of the coil core heads 40a and 40b is movable in the axial direction J at the fitting portion 33i of the cylindrical portion 33. It showed that it was inserted in the fitting part 33i.

Further, the rod-shaped member 43 is shown to rotate integrally with the optical frame 130.

According to this, when the magnetic force is applied from the coil core heads 40 a and 40 b to the rod-shaped member 43, the rod-shaped member 43 moves in the axial direction J as described above. Since the frame 130 is not fixed, even the optical frame 130 does not move in the axial direction J together with the rod-shaped member 43.

Furthermore, since the cross-section in the direction R of the fitting portion 33 i into which the rod-shaped member 43 and the rod-shaped member 43 of the tube portion 33 are fitted has a polygonal shape, the rotational force of the rod-shaped member 43 is reliably transmitted to the tube portion 33. Therefore, the optical frame 130 can be reliably rotated between the first position and the second position as the rod-shaped member 43 is rotated.

Since the optical frame 130 does not move in the axial direction J when the optical frame 130 is rotated, the lens frame 34 is inclined as in the conventional case described above. Since the portion does not locally contact the first substrate 45 and the second substrate 75, the optical frame 130 can be smoothly rotated with a small rotational force, and the optical of the lens 35 can be rotated. The characteristics can be stabilized.

Furthermore, since the optical frame 130 does not move in the axial direction J as it rotates, the space in the axial direction J between the first substrate 45 and the second substrate 75, that is, the lens 35. Since the gap J1 between the optical device 14 and the first substrate 45 can be made smaller than before, the optical device 14 can be downsized.

Further, since the optical frame 130 is not fixed to the rod-shaped member 43 as in the conventional case, the weight of the rod-shaped member 43 is reduced, so that the impact force when receiving an impact is also reduced, so that the rod-shaped member 43 is broken. It becomes difficult.

From the above, it is possible to provide the optical device 14 and the endoscope 1 having a configuration in which the optical frame 130 can be smoothly rotated with a small driving force and can be miniaturized.

(Second Embodiment)
FIG. 12 is a perspective view showing a modification of the shape of the rod-shaped member in the optical device according to the present embodiment.

The configuration of the optical device according to the second embodiment is different from that of the optical device according to the first embodiment shown in FIGS.

Therefore, only this difference will be described, the same reference numerals are given to the same components as those in the second embodiment, and the description thereof will be omitted.

In 1st Embodiment mentioned above, the rod-shaped member 43 showed that the cross section of the direction R had polygonal shape, as shown in FIG.

On the other hand, the cross-sectional shape of the rod-shaped member 43 of the present embodiment has a circular shape. However, when the rotational force is applied to the rod-shaped member 43 having a circular cross-sectional shape, the outer periphery 43g of the rod-shaped member 43 is not caught on the inner peripheral surface 33in of the fitting portion 33i of the tubular portion 33. It cannot be transmitted to the unit 33.

Therefore, in the present embodiment, as shown in FIG. 12, a configuration in which a ring 46 having a plurality of polygonal outer shapes spaced apart in the axial direction J is fixed to the outer periphery 43g of a rod-shaped member 43 having a circular cross section. The ring 46 and the rod-shaped member 43 have a structure that can be fitted into the fitting portion 33 i. Other configurations are the same as those in the first embodiment described above.

The outer shape of the ring 46 is not limited to a hexagon, and may be any shape as long as it is a polygonal shape, and may not be the same as the cross-sectional shape of the fitting portion 33i.

According to such a configuration, the corner portion of the outer periphery 46 g of the ring 46 is hooked on the corner portion of the inner peripheral surface 33 in of the fitting portion 33 i, so that the rotational force of the rod-shaped member 43 can be transmitted to the cylindrical portion 33. Other effects are the same as those of the first embodiment described above.

In addition, when the cross-sectional shape of the rod-shaped member 43 is circular, the member which can be hooked on the corner | angular part of the internal peripheral surface 33in provided in the cylinder part 33 is not limited to a ring, The pin provided in the rod-shaped member 43, etc. Of course, it may be.

A modification will be described below with reference to FIGS. FIG. 13 is a diagram schematically showing a modified example in which a wing guide is provided on the second substrate of FIG. 3 together with the optical frame, the rotation stopper, and the second substrate. FIG. 14 is a diagram showing the optical frame of FIG. It is a figure which shows the cross section of a dynamic stopper and a 2nd board | substrate with a stopper and a coil core head.

As shown in FIGS. 13 and 14, a wing guide 200 having an arc shape when the optical device 14 is viewed in plan from the optical axis direction L is provided on the surface of the second substrate 75 on which the lens frame 34 slides and rotates. It does not matter.

The wing guide 200 is slightly spaced between the first substrate 45 and the second substrate 75 in the axial direction J and closer to the first substrate 45 side than the surface of the lens frame 34 on the first substrate 45 side. It has a part to be located.

If the wing guide 200 is provided in this way, even if the optical frame 130 tries to move in the axial direction J, the wing guide 200 regulates the movement of the lens frame 34 in the axial direction J. Movement and tilt in the optical axis direction L accompanying movement can be prevented more reliably.

Further, if the optical device 14 is provided with the wing guide 200, the optical frame 130 does not come out upward in FIG. 14, and therefore the first substrate 45 can be omitted from the optical device 14. The optical frame 130 includes a cylindrical portion 33 and an optical member 131 as in the first and second embodiments described above, and a main portion is configured.

In the first and second embodiments described above, the optical device 14 is shown by taking an optical member including the lens 15 for changing the magnification as an example. Etc., and can also be applied to an optical member having a configuration in which the diaphragm member and the filter are moved by a magnetic force between the first position and the second position.

By the way, when the optical device 14 is assembled, if dust or the like enters between the surface of the lens 35 or the first substrate 45 and the second substrate 75, there is a problem that the dust or the like cannot be removed. Therefore, since it is necessary to prevent the entry of dust and the like into the optical device 14, there is a problem in that the yield is poor because the dust management must be strictly performed and the production facilities must be maintained.

A configuration for solving such a problem will be described below with reference to FIGS. FIG. 15 is a diagram schematically showing a configuration in which a dust removal groove is provided in the rotation stopper of the optical frame at the first position together with the second substrate and the optical frame.

As shown in FIGS. 3 and 15, in the rotation stopper 37 having a substantially L shape in plan view from the optical axis direction L, the rotation stopper 37 penetrates the bending portion G in the radial direction of the optical device 14. A dust discharge groove 41 is formed.

According to such a configuration, even when the optical device 14 is being assembled, the air frame A is moved from the convex portion 75y side while the optical frame 130 is moved to the second position side as shown in FIG. , Dust on the surface of the lens 35, dust accumulated in the vicinity of the bent portion G on the circular portion 75x of the second substrate 75, and the like from the dust discharge groove 41 to the outside of the optical device 14 by the air A. And can be discharged easily.

The reason why the dust discharge groove 41 is provided in the bent portion G of the rotation stopper 37 is that dust or the like tends to accumulate in the bent portion G.

Further, in the assembly process before the rotation stopper 36 is provided, as shown by the dotted line in FIG. 15, the lens 35 protrudes outside the second substrate 75 when viewed in plan from the optical axis direction L. 3 can be easily removed, for example, dust attached to the surface of the lens 35 can be easily removed.

As described above, since the optical device can be cleaned before the optical device 14 is completed, the management of dust and the like during assembly is facilitated, and the production cost can be reduced.

Further, another configuration will be described below with reference to FIG. FIG. 16 is a diagram schematically showing a modification in which dust discharge holes are further provided in the second substrate of FIG.

As shown in FIG. 16, in the vicinity of the bent portion G of the rotation stopper 37 in the circular portion 75x of the second substrate 75, the circular portion 75x is penetrated in the optical axis direction L at a position communicating with the dust discharge groove 41. A dust outlet hole 51 may be provided.

According to such a configuration, even when the optical device 14 is being assembled, the air A is supplied from the convex portion 75y side with the optical frame 130 moved to the third position as shown in FIG. If sprayed, dust on the surface of the lens 35, dust accumulated in the vicinity of the bent portion G on the circular portion 75x of the second substrate 75, and the like, are not only dust discharge grooves 41 but also dust discharge holes. 51 can be easily discharged out of the optical device 14. The dust discharge hole 51 may be provided in the circular portion 45x of the first substrate 45.

DESCRIPTION OF SYMBOLS 1 ... Endoscope 2 ... Insertion part 14 ... Optical apparatus 33 ... Cylindrical part 33b ... Closure part 33i ... Insertion part 33in ... Turning regulation part 40a of an insertion part ... Coil core head (magnetic part)
40b ... Coil core head (magnetic part)
42. Stop stopper (movement restricting member)
43 ... rod-like member 45 ... first substrate 75 ... second substrate 130 ... optical frame 131 ... optical member 140 ... electromagnet B ... optical axis C ... circumferential direction J ... axial direction J2 ... protrusion amount H ... repulsive force I ... attractive force R ... direction orthogonal to the axial direction T1 ... center position T2 ... center position

Claims (8)

A rod-shaped member that is rotatable in the circumferential direction and is composed of a magnet polarized in two magnetic poles in a direction orthogonal to the axial direction;
It has two magnetic parts that are provided on an axis with respect to the rod-shaped member and apply magnetic force to the rod-shaped member, and when the electric power is supplied, the two magnetic parts become magnetic poles different from each other. An electromagnet for rotating the rod-shaped member or stopping the rotation of the rod-shaped member by attractive force;
An optical frame that supports the rod-shaped member movably in the axial direction of the rod-shaped member, and rotates integrally with the rod-shaped member in the circumferential direction;
An optical device comprising: The optical frame includes a cylindrical portion into which the rod-shaped member is movably fitted in the axial direction, and an optical axis fixed to the cylindrical portion and parallel to the axial direction as the cylindrical portion rotates. The optical device according to claim 1, further comprising a removable optical member. The said cylinder part has the rotation control part which controls the rotation to the said circumferential direction relative to the said rod-shaped member, and the said rod-shaped member abuts in the said circumferential direction. An optical device according to 1. The optical device according to claim 3, wherein a cross section perpendicular to the axial direction of the fitting portion into which the rod-shaped member and the rod-shaped member in the cylindrical portion are fitted has a polygonal shape. The cylindrical portion has one end in the axial direction closed and the other end in the axial direction opened.
In the axial direction, the two magnetic portions are such that the center position where the magnetic force of the two magnetic portions is the maximum is in contact with the closed portion at the one end of the cylindrical portion in the fitting portion. 5. The optical device according to claim 2, wherein the optical device is shifted to the one end side from a center position where the maximum is. The optical member is positioned between the first substrate and the second substrate that are separated in the axial direction, and the cylindrical portion is located between the first substrate and the second substrate. It is pivotally supported,
The optical member is either the first substrate or the second substrate by the rod member being pressed against the closing portion of the tube portion by the attractive force between the two magnetic portions and the rod member. The optical device according to claim 5, wherein the position in the axial direction is defined by being pressed against the optical device. The optical apparatus according to claim 5, further comprising a movement restricting member that defines a protruding amount in a direction protruding from the other end of the cylindrical portion of the rod-shaped member. An endoscope, wherein the optical device according to any one of claims 1 to 7 is provided in a distal end of an insertion portion to be inserted into a subject.

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