JP6109023B2 - Optical unit - Google Patents

Description

  The present invention relates to an optical unit that allows an optical member to be inserted into and removed from an optical path such as an imaging optical system.

  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 units 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 apparatus. For example, in Patent Document 1, a rotating shaft member that rotatably supports the light adjusting unit is magnetized, and the rotating shaft member is rotated by a magnetic force generated from an electromagnetic drive source, whereby the light adjusting unit is optically There is disclosed a light adjusting device (optical unit) that moves between a first stationary position retracted from an opening (optical path) and a second stationary position overlapping the optical aperture.

JP 2012-123037 A

  However, the optical unit disclosed in the above-mentioned Patent Document 1 can obtain only two types of optical characteristics, that is, a state where the optical member is inserted on the optical path and a state where the optical member is retracted from the optical path. There was a need for further improvements in functionality.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an optical unit capable of realizing a variety of optical characteristics with a simple configuration.

An optical unit according to an aspect of the present invention includes a shaft member made of a permanent magnet magnetized on a shaft object, and a shaft holding member that holds the shaft member so as to be rotatable about an axis and movable back and forth in the axial direction. And can be displaced between an insertion position for inserting the optical member on the optical path of the optical system and a retreat position for retracting the optical member from the optical path as the shaft member rotates. In addition, as the shaft member moves forward and backward, the optical member can be displaced between an advance position where the optical member advances along the optical axis of the optical path and a retract position where the optical member retracts along the optical axis of the optical path. An optical holding member, and a first electromagnetic drive source having an electromagnet capable of generating a magnetic field that interferes with the magnetic field of the shaft member at a position offset to one side in the axial direction from the peak of the magnetic field formed by the shaft member Before the shaft member is formed Comprising a second electromagnetic drive source having an electromagnet capable of generating a magnetic field that interferes with the magnetic field of the shaft member, the at position offset to the other side in the axial direction than the peak of the magnetic field, the first electromagnetic drive source When the drive current is supplied, the shaft member is displaced to one side in the axial direction by the interference between the magnetic field generated in the electromagnet and the peak of the magnetic field of the shaft member, and the shaft member Are rotated in different directions around the axis according to the direction of energization of the drive current, and the second electromagnetic drive source has a magnetic field generated in the electromagnet and the shaft when the drive current is supplied. The shaft member is displaced to the other side in the axial direction due to interference with the peak of the magnetic field of the member, and the shaft member is rotated in different directions around the axial center according to the energization direction of the drive current. let Monodea .

  According to the optical unit of the present invention, a variety of optical characteristics can be realized with a simple configuration.

The perspective view which concerns on the 1st Embodiment of this invention and shows the structure of an endoscope. Same as above, explanatory view of the tip of the insertion part Same as above, main part sectional view of the imaging device Same as above, exploded perspective view of optical unit Same as above, perspective view of optical unit Same as above, top view of first and second electromagnetic drive sources The top view which shows the optical unit of the state which inserted the lens on the optical path of an imaging optical system from the 1st electromagnetic drive source side same as the above. The same as above, the top view which shows the optical unit of the state which inserted the lens on the optical path of an imaging optical system from the 2nd electromagnetic drive source side The top view which shows the optical unit of the state which retracted the lens from the imaging optical system from the 1st electromagnetic drive source side same as the above. The same as above, the top view which shows the optical unit of the state which retracted the lens from the imaging optical system from the 2nd electromagnetic drive source side As above, a plan view showing the internal structure of the optical unit with a lens inserted in the optical path of the imaging optical system As above, a plan view showing the internal structure of the optical unit with the lens retracted from the optical path of the imaging optical system The main part sectional view showing the optical unit in a state where the lens is arranged at the insertion position on the optical path of the imaging optical system and the retracted position in the optical axis direction along the line AA in FIG. The main part sectional view showing the optical unit in a state where the lens is disposed at the retracted position from the optical path of the imaging optical system and at the retracted position in the optical axis direction along the line BB in FIG. The main part sectional view showing the optical unit in a state where the lens is arranged at the insertion position on the optical path of the imaging optical system and the advance position in the optical axis direction along the line AA in FIG. The main part sectional view showing the optical unit in a state where the lens is arranged at the retracted position from the optical path of the imaging optical system and at the advanced position in the optical axis direction along the line BB in FIG. Same as above, explanatory diagram showing the relationship between the magnetic field generated by the shaft member and the electromagnet The same as above, explanatory drawing when attractive force is acting between the electromagnet of the first electromagnetic drive source and the shaft member The same as above, explanatory drawing when attractive force is acting between the electromagnet of the second electromagnetic drive source and the shaft member Same as above, time chart explaining an example of drive current supplied to electromagnetic drive source An exploded perspective view of an optical unit according to the second embodiment of the present invention. The top view which shows the internal structure of the optical unit of the state which has arrange | positioned the lens in the insertion position on the optical path of an imaging optical system, and the 1st middle position of an optical axis direction same as the above. As above, a plan view showing the internal structure of the optical unit in a state in which a lens is disposed at a retracted position from the optical path of the imaging optical system. The top view which shows the internal structure of the optical unit of the state which has arrange | positioned the lens in the insertion position on the optical path of an imaging optical system, and the 2nd halfway position of an optical axis direction as above. The main part sectional view showing the optical unit in a state where the lens is arranged at the retracted position on the optical path of the imaging optical system and at the retracted position in the optical axis direction. The main part sectional view showing the optical unit in a state where the lens is arranged at the insertion position from the optical path of the imaging optical system and at the retracted position in the optical axis direction. The main part sectional view showing the optical unit in a state where the lens is arranged at the insertion position on the optical path of the imaging optical system and the first intermediate position in the optical axis direction. The main part sectional view showing the optical unit in a state where the lens is arranged at the retracted position from the optical path of the imaging optical system and at the advanced position in the optical axis direction. The main part sectional view showing the optical unit in a state where the lens is arranged at the insertion position on the optical path of the imaging optical system and the advance position in the optical axis direction. The main part sectional view showing the optical unit in a state where the lens is arranged at the insertion position on the optical path of the imaging optical system and at the second middle position in the optical axis direction. Same as above, time chart explaining an example of drive current supplied to electromagnetic drive source FIG. 6 is an exploded perspective view showing a configuration inside the housing of the optical unit according to the third embodiment of the present invention. Same as above, a plan view showing the internal structure of the optical unit with a filter inserted in the optical path of the imaging optical system As above, a plan view showing the internal structure of the optical unit in a state where the filter is retracted from the optical path of the imaging optical system. The main part sectional view showing the optical unit in a state where a filter is inserted in the optical path of the imaging optical system and a lens is disposed at a retracted position in the optical axis direction. The main part sectional view showing the optical unit in a state where the filter is retracted from the optical path of the imaging optical system and the lens is disposed at the retracted position in the optical axis direction. The main part sectional view showing the state where the filter is retracted from the optical path of the imaging optical system and the lens is arranged at the advanced position in the optical axis direction. Same as above, a cross-sectional view of the principal part showing a state in which a filter is inserted in the optical path of the imaging optical system and a lens is disposed at the advanced position in the optical axis direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 20 relate to the first embodiment of the present invention, FIG. 1 is a perspective view showing the configuration of the endoscope, FIG. 2 is an explanatory view of the distal end portion of the insertion portion, and FIG. 4 is an exploded perspective view of the optical unit, FIG. 5 is a perspective view of the optical unit, FIG. 6 is a plan view of the first and second electromagnetic drive sources, and FIG. 7 is a lens on the optical path of the imaging optical system. FIG. 8 is a plan view showing the optical unit in the inserted state from the first electromagnetic drive source side, and FIG. 8 is a plan view showing the optical unit in a state where a lens is inserted on the optical path of the imaging optical system from the second electromagnetic drive source side. FIG. 9 is a plan view showing the optical unit with the lens retracted from the imaging optical system from the first electromagnetic drive source side, and FIG. 10 shows the second electromagnetic unit with the lens retracted from the imaging optical system. FIG. 11 is a plan view from the drive source side, and FIG. 11 shows a state in which a lens is inserted on the optical path of the imaging optical system. 12 is a plan view showing the internal structure of the optical unit, FIG. 12 is a plan view showing the internal structure of the optical unit with the lens retracted from the optical path of the imaging optical system, and FIG. 13 is an insertion position and light on the optical path of the imaging optical system. FIG. 14 is a cross-sectional view of the main part showing the optical unit in a state where the lens is arranged at the retracted position in the axial direction along line AA in FIG. 7, and FIG. 14 is a retracted position from the optical path of the imaging optical system and a retracted position in the optical axis direction. FIG. 15 is a cross-sectional view of the main part showing the optical unit in the state where the lens is arranged along the line BB in FIG. 9, and FIG. 15 shows the lens arranged at the insertion position on the optical path of the imaging optical system and at the advance position in the optical axis direction. FIG. 16 is a cross-sectional view of the principal part showing the optical unit in the state along line AA in FIG. 7, and FIG. 16 shows the optical unit in a state in which the lens is disposed at the retracted position from the optical path of the imaging optical system and at the advanced position in the optical axis direction. FIG. 9 is a cross-sectional view of the main part taken along line BB in FIG. 7 is an explanatory view showing the relationship between the magnetic field generated by the shaft member and the electromagnet, FIG. 18 is an explanatory view when an attractive force is acting between the electromagnet of the first electromagnetic drive source and the shaft member, and FIG. FIG. 20 is an explanatory diagram when an attractive force is acting between the electromagnet of the electromagnetic drive source 2 and the shaft member, and FIG. 20 is a time chart for explaining an example of a drive current supplied to the electromagnetic drive source.

  An endoscope 1 shown in FIG. 1 includes a long insertion portion 2 that can be inserted into a subject, an operation portion 3 that is connected to the proximal end side of the insertion portion 2, and a side portion of the operation portion 3. And a universal cord 4 that is provided.

  The operation unit 3 includes an operation unit main body 10 constituting an operation gripping unit, and a distal end side of the operation unit main body 10 is connected to a proximal end side of the insertion unit 2 via a bend preventing unit 11. Further, near the distal end of the operation unit main body 10, the treatment instrument insertion port 13 serving as an opening on the proximal end side of the treatment instrument insertion channel 28 (see FIG. 2), which is a conduit through which the treatment instrument is inserted into the insertion section 2. Is provided. On the other hand, an angle lever 14 and switches 15 for various endoscope functions are provided near the proximal end of the operation unit main body 10.

  One end side of the universal cord 4 is connected to the side portion of the operation unit main body 10 via a bend preventing portion 16. On the other hand, a scope connector portion 20 is provided at the extended end which is the other end side of the universal cord 4. A light source side connector 21 detachably attached to a light source device (not shown) is provided at the end of the scope connector unit 20. The light source side connector 21 is provided with a proximal end portion of a light guide (not shown) extending from the insertion portion 2 side, and an electrical contact 22 is provided. The light source side connector 21 is connected to the light source device. The ride guide is optically connected to the light source in the light source device, and the electrical contact 22 is electrically connected to the power source in the light source device. In addition, an electrical connector 23 detachably attached to a video processor (not shown) is provided on the side of the scope connector unit 20.

  The insertion portion 2 has a distal end portion 5, a bendable bending portion 6 disposed on the proximal end side of the distal end portion 5, and a long and flexible disposed on the proximal end side of the bending portion 6. The flexible tube portion 7 is configured to be connected in order from the tip.

  For example, as shown in FIG. 2, the distal end portion 5 is provided with an illumination optical system 25 for illuminating the inside of the subject, an imaging device 26 for imaging the subject, and the like. An air supply / water supply channel 27 for supplying fluid toward the site, a treatment instrument insertion channel 28 from which a treatment instrument such as forceps is led out, and the like are formed.

  As shown in FIG. 3, the imaging device 26 has a lens frame 31 on the distal end side. In the lens frame 31, as an optical member constituting the imaging optical system 30 (optical system), for example, an objective lens 32 and The diaphragm 33 and the lens 34 are held along the optical axis O direction in order from the front end side. In the lens frame 31, an optical unit 50 capable of displacing the movable lens 35 as an optical member is disposed between the diaphragm 33 and the lens 34 with respect to the optical path formed by these. .

  An imaging frame 37 is fitted on the base end side of the lens frame 31, and an image sensor 38 made of a solid-state imaging device or the like is held in the imaging frame 37 via a cover glass 39. In the imaging frame 37, an electric board 40 is disposed on the base end side of the image sensor 38. Various electric signals are supplied to the image sensor 38 and images acquired by the image sensor 38 are provided on the electric board 40. A signal cable 41 for transmitting signals and the like is connected.

  Here, a drive cable 42 is branched from the signal cable 41, and this drive cable 42 is connected to the optical unit via a wiring pattern 43 arranged along the inner surfaces of the imaging frame 37 and the lens frame 31. 50. Thereby, for example, in response to an operation input to the switches 15 by an operator or the like, the optical unit 50 is supplied with a drive current from the power control unit 80 disposed in the light source device or the like.

  4 and 5, the optical unit 50 includes a housing 51 as a shaft holding member, a shaft member 52 held by the housing 51, an optical holding member 53 pivotally attached to the shaft member 52, a shaft The first and second electromagnetic drive sources 54 and 55 for rotating the member 52 are configured.

  The housing 51 includes, for example, a first substrate 56 and a second substrate 57 that face each other. The first and second substrates 56 and 57 are constituted by flat plate members having an external shape in which circular portions 56a and 57a and rectangular portions 56b and 57b are integrated.

  The first and second substrates 56 and 57 are provided with openings 56c and 57c that open corresponding to the optical path of the imaging optical system 30 in the center of the circular portions 56a and 57a. The first and second substrates 56 and 57 are provided with bearing holes 56d and 57d at positions offset from the openings 56c and 57c of the circular portions 56a and 57a toward the rectangular portions 56b and 57b. Further, the first substrate 56 is provided with a first spacer 58a having a substantially L shape at a position offset toward the anti-rectangular portion 56b on the circular portion 56a, and an anti-circular shape on the rectangular portion 56b. A second spacer 58b having a substantially I-shape is erected at a position offset toward the portion 56a. A hollow housing 51 is configured by connecting the first and second substrates 56 and 57 via the first and second spacers 58a and 58b.

  The shaft member 52 is configured by 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 on an axis target. The shaft member 52 is rotatable about the axis with respect to the bearing holes 56d and 57d of the first and second substrates 56 and 57 of the housing 51 and is axially (that is, the light of the imaging optical system 30). It is inserted in a state in which it can move back and forth in the direction of the axis O).

  The optical holding member 53 is integrally formed with an arm portion 53a whose one end is pivotally attached to the shaft member 52 by bonding or the like, and an annular optical holding portion 53b that holds the movable lens 35 on the other end side of the arm portion 53a. It is comprised by the made flat member. The optical holding member 53 is disposed in the housing 51, thereby preventing the shaft member 52 from falling off the bearing holes 56 d and 57 d and interlocking with the rotation and forward / backward movement of the shaft member 52. It is possible to displace inside.

  The first electromagnetic drive source 54 includes, for example, a base member 62 fixed on the first substrate 56, and first and second core arms 63, 64 respectively connected to the end portions of the base member 62. And a yoke 61 formed of an integral magnetic body.

  In the present embodiment, the base member 62 is fixed on the outer surface of the circular portion 56a of the first substrate 56 at a position on the bearing hole 56d side with the opening 56c interposed therebetween (see FIGS. 7 and 9). Each end of the base member 62 is provided with first and second connecting portions 62a and 62b which are formed to be narrower than other portions. The first and second connecting portions 62a and 62b include The base end sides of the first and second core arms 63 and 64 are connected to each other.

  The first and second core arms 63 and 64 extend to the bearing hole 56 d side along the outer surface of the first substrate 56. The first and second electromagnetic coils 65 and 66 are formed on the outer peripheral portions of the first and second core arms 63 and 64 by sequentially winding a series of windings. The first and second core arms 63 and 64 and the first and second electromagnetic coils 65 and 66 constitute first and second electromagnets 67 and 68, respectively. Further, on the distal end side of the first and second electromagnets 67 and 68, the distal end portions of the first and second core arms 63 and 64 are projected as first and second core heads 63a and 64a. The second core heads 63a and 64a face the side portion (outer peripheral portion) of the shaft member 52 protruding from the bearing hole 56d.

  Similarly, the second electromagnetic drive source 55 includes, for example, a base member 72 fixed on the second substrate 57, and third and fourth core arms respectively connected to each end of the base member 72. 73 and 74 have a yoke 71 formed of an integral magnetic body.

  In this embodiment, the base member 72 is fixed on the outer surface of the circular portion 57a of the second substrate 57 at a position opposite to the bearing hole 57d with the opening 57c interposed therebetween (FIGS. 4, 8, and 10). reference). Each end portion of the base member 72 is provided with third and fourth connecting portions 72a and 72b which are formed to be narrower than other portions. In the third and fourth connecting portions 72a and 72b, The proximal ends of the third and fourth core arms 73 and 74 are connected to each other.

  The third and fourth core arms 73 and 74 are extended along the outer surface of the second substrate 57 toward the bearing hole 57d. A third and fourth electromagnetic coils 75 and 76 are formed on the outer peripheral portions of the third and fourth core arms 73 and 74 by sequentially winding a series of windings. These third and fourth core arms 73 and 74 and third and fourth electromagnetic coils 75 and 76 constitute third and fourth electromagnets 77 and 78, respectively. Further, on the tip side of the third and fourth electromagnets 77 and 78, the tip portions of the third and fourth core arms 73 and 74 protrude as third and fourth core heads 73a and 74a. The fourth core heads 73a and 74a face the side portion (outer peripheral portion) of the shaft member 52 protruding from the bearing hole 57d.

  Here, in the optical unit 50 of the present embodiment configured as described above, the first and second spacers 58a and 58b constituting the housing 51 function as a stopper for restricting the rotation of the optical holding member 53. Have. The optical holding member 53 is in contact with the first spacer 58a and is restricted from rotating in one direction around the shaft member 52, so that the optical holding portion 53b is opened in the openings of the circular portions 56a and 57a. It is positioned at a position where it is superimposed on the same axis as 56c and 57c. That is, the optical holding member 53 is positioned at the insertion position where the movable lens 35 is inserted on the optical path (see FIGS. 7, 8, and 11). On the other hand, the optical holding member 53 is in contact with the second spacer 58b and is restricted from rotating in the other direction around the shaft member 52, so that the optical holding portion 53b is positioned at the rectangular portion 56b side. Positioned. That is, the optical holding member 53 is positioned at a retracted position for retracting the movable lens 35 from the optical path (see FIGS. 9, 10, and 12).

  In addition, the first and second substrates 56 and 57 constituting the housing 51 have a function as a stopper for restricting the forward and backward movement of the optical holding member 53. The optical holding member 53 is in contact with the first substrate 56, and the movement in one direction along the optical axis O direction is restricted, so that the movable lens 35 is moved back to a preset position. (See FIGS. 13 and 14). On the other hand, the optical holding member 53 is brought into contact with the second substrate 57 via the movable lens 35, and the movement of the optical holding member 53 in the other direction along the optical axis O direction is restricted, so that the movable lens 35 is preset. It is positioned at the advance position to advance to the position (see FIGS. 15 and 16).

  Further, for example, when the optical holding member 53 is in the insertion position, the shaft member 52 has the N pole facing the first and third core heads 63a and 73a and the S pole having the second and fourth core heads 64a and 64a. 74a (see FIGS. 7 and 8), and when the optical holding member 53 is in the retracted position, the south pole faces the first and third core heads 63a and 73a, and the north pole is the second and second cores. The position relative to the arm portion 53a (rotational position with respect to the arm portion 53a) is set so as to face the fourth core heads 64a and 74a (see FIGS. 9 and 10).

  Further, for example, as shown in FIG. 17, the shaft member 52 has the first and second core heads 63 a and 64 a at positions offset to one side in the axial direction from the peak of the magnetic field formed by the shaft member 52. Relative position with respect to the arm portion 53a so that the third and fourth core heads 73a and 74a are exposed to a position that is faced and offset to the other side in the axial direction from the peak of the magnetic field formed by the shaft member 52. (Position in the axial direction with respect to the arm portion 53a) is set. That is, for example, in the present embodiment, the shaft member 52 has a magnetic field peak at substantially the center in the axial direction, and the arm portion 53a of the optical holding member 53 is near the center of the shaft member 52 in the axial direction. It is fixed. The first and second core heads 63a and 64a are thus limited by the first and second substrates 56 and 57 limiting the range of the optical holding member 53 fixed to the shaft member 52. Can generate a magnetic field from a position that is always offset to one side in the axial direction with respect to the peak of the magnetic field of the shaft member 52, and the third and fourth core heads 73 a and 74 a It is possible to generate a magnetic field from a position that is always offset to the other side in the axial direction with respect to the peak of the magnetic field.

  The winding directions of the first and second electromagnetic coils 65 and 66 are set so as to generate magnetic fields in different directions. That is, for example, when a predetermined positive current I (see FIG. 6) is supplied from the power supply control unit 80 to the first electromagnetic drive source 54, the first electromagnetic coil 65 is connected to the first core head 63a side. The second electromagnetic coil 66 generates a magnetic field that magnetizes the second core head 64a side to the N pole that is the second magnetic pole. On the other hand, for example, when a predetermined negative current −I is supplied from the power supply control unit 80 to the second electromagnetic drive source 54, the first electromagnetic coil 65 uses the second magnetic pole on the first core head 63 a side. A magnetic field that magnetizes a certain N pole is generated, and the second electromagnetic coil 66 generates a magnetic field that magnetizes the second core head 64a side to the S pole that is the first magnetic pole.

  Similarly, the winding directions of the third and fourth electromagnetic coils 75 and 76 are set so as to generate magnetic fields in different directions, that is, for example, the second electromagnetic drive from the power supply control unit 80. When a predetermined positive current I (see FIG. 6) is supplied to the source 55, the third electromagnetic coil 75 generates a magnetic field that magnetizes the first core head 73a side to the S pole that is the first magnetic pole. The fourth electromagnetic coil 76 generates a magnetic field that magnetizes the fourth core head 74a side to the N pole that is the second magnetic pole. On the other hand, for example, when a predetermined negative current −I is supplied from the power supply control unit 80 to the second electromagnetic drive source 55, the third electromagnetic coil 75 uses the second magnetic pole as the first core head 73a side. A magnetic field that magnetizes a certain N pole is generated, and the fourth electromagnetic coil 76 generates a magnetic field that magnetizes the fourth core head 74a side to the S pole that is the first magnetic pole.

  Next, the operation of the optical unit 50 will be described with reference to FIGS.

  For example, as shown in FIGS. 7 and 11, when the optical holding member 53 is in the insertion position for inserting the movable lens 35 on the optical path, the S pole of the shaft member 52 faces the second and fourth core heads 64a and 74a. In addition, the N pole of the shaft member 52 is opposed to the first and third core heads 63a and 73a. In such a state, for example, when a positive current I is supplied to the first electromagnetic drive source 54 (see timing t1 in FIG. 20), the first and second electromagnetic coils 65 and 66 are When excited, the first core head 63a side is magnetized to the S pole and the second core head 64a side is magnetized to the N pole. Then, the attractive force between the first core head 63a magnetized in the S pole and the N pole of the shaft member 52 facing the first core head 63a, and the second core head 64a magnetized in the N pole and the second Due to the attractive force with the S pole of the shaft member 52 facing the core head 64a, the optical holding portion 53b pivotally attached to the shaft member 52 abuts on the first spacer 58a, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the insertion position. In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the first and second core heads 63a, 64a (see FIG. 17), the shaft member 52 and the first, second In each attractive force between the core heads 63a and 64a, a component attracting in the axial direction is generated (see FIG. 18). As a result, the optical holding member 53 is drawn toward the first substrate 56 and is held at a preset retracted position (see FIG. 13).

  Further, in the state where the optical holding member 53 is held at the insertion position and the retracted position in this way, for example, when an operator input is made to the switches 15 of the operation unit 3, the first electromagnetic drive The drive current supplied to the source 54 is switched from the positive current I to the negative current −I (see timing t1 in FIG. 20). As a result, the excitation states of the first and second electromagnetic coils 65 and 66 are reversed, and the first core head 63a side is magnetized to the N pole, and the second core head 64a side is magnetized to the S pole. Then, the repulsive force between the first core head 63a magnetized in the N pole and the N pole of the shaft member 52 facing the first core head 63a, and the second core head 64a magnetized in the S pole and the second The shaft member 52 is rotated by the repulsive force with the S pole of the shaft member 52 facing the core head 64a, and the optical holding member 53 is displaced to the retracted position for retracting the movable lens 35 from the optical path (see FIGS. 9 and 12). ). At this time, the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the first and second core heads 63a and 64a (see FIG. 17). In each repulsive force between the core heads 63a and 64a, components repelling in the axial direction are generated. Thereby, the optical holding member 53 is temporarily separated from the first substrate 56 side, and the sliding resistance when the shaft member 52 is rotated is reduced.

  When the optical holding member 53 is displaced to the retracted position, the S pole of the shaft member 52 is opposed to the first and third core heads 63a and 73a, and the N pole of the shaft member 52 is the second and fourth core heads. 64a and 74a. Then, the attractive force between the first core head 63a magnetized in the N pole and the S pole of the shaft member 52 facing the first core head 63a, and the second core head 64a magnetized in the S pole and the second Due to the attractive force of the shaft member 52 facing the core head 64a with the N pole, the optical holding portion 53b pivotally attached to the shaft member 52 comes into contact with the second spacer 58b, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the retracted position. In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the first and second core heads 63a, 64a (see FIG. 17), the shaft member 52 and the first, second In each attractive force between the core heads 63a and 64a, a component attracting in the axial direction is generated (see FIG. 18). As a result, the optical holding member 53 is drawn toward the first substrate 56 and is held at a preset retracted position (see FIG. 14).

  Further, in the state where the optical holding member 53 is held in the retracted position and the retracted position in this way, for example, when an operator input is made to the switches 15 of the operation unit 3, the first electromagnetic drive The drive current supplied to the source 54 is turned off, and a predetermined negative current −I is supplied to the second electromagnetic drive source 55 as the drive current (see timing t3 in FIG. 20). As a result, the third and fourth electromagnetic coils 75 and 76 are excited, the third core head 73a side is magnetized to the N pole, and the fourth core head 74a side is magnetized to the S pole. Then, the attractive force between the third core head 73a magnetized in the N pole and the S pole of the shaft member 52 facing the third core head 73a, and the fourth core head 74a magnetized in the S pole and the fourth core Due to the attractive force of the shaft member 52 facing the core head 74a with the N pole, the optical holding portion 53b pivotally attached to the shaft member 52 comes into contact with the second spacer 58b, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the retracted position (see FIGS. 10 and 12). In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the third and fourth core heads 73a, 74a (see FIG. 17), the shaft member 52 and the third, fourth, In each attractive force between the core heads 73a and 74a, a component attracting in the axial direction is generated (see FIG. 19). As a result, the optical holding member 53 is drawn toward the second substrate 57, displaced to a preset advance position, and held at the advance position (see FIG. 16).

  Further, in the state where the optical holding member 53 is held at the retracted position and the advanced position in this way, for example, when an operator input is made to the switches 15 of the operation unit 4 or the like, the second electromagnetic drive The drive current supplied to the source 55 is switched from the negative current −I to the positive current I (see timing t4 in FIG. 20). As a result, the excited states of the third and fourth electromagnetic coils 75 and 76 are reversed, the third core head 73a side is magnetized to the S pole, and the fourth core head 74a side is magnetized to the N pole. The repulsive force between the third core head 73a magnetized to the S pole and the S pole of the shaft member 52 facing the third core head 73a, and the fourth core head 74a magnetized to the N pole and the fourth core The shaft member 52 is rotated by the repulsive force with the north pole of the shaft member 52 facing the core head 74a, and the optical holding member 53 is displaced to the insertion position for inserting the movable lens 35 on the optical path (see FIGS. 8 and 11). ). At this time, the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the third and fourth core heads 73a and 74a (see FIG. 17). In each repulsive force between the core heads 73a and 74a, components repelling in the axial direction are generated. Thereby, the optical holding member 53 (movable lens 35) is temporarily separated from the second substrate 57 side, and the sliding resistance when the shaft member 52 is rotated is reduced.

  When the optical holding member 53 is displaced to the intrusion position, the S pole of the shaft member 52 is opposed to the second and fourth core heads 64a and 74a, and the N pole of the shaft member 52 is the first and third core heads. It is opposed to 63a, 73a. Then, the attractive force between the third core head 73a magnetized at the S pole and the N pole of the shaft member 52 facing the third core head 73a, and the fourth core head 74a magnetized at the N pole and the fourth core Due to the attractive force of the shaft member 52 facing the core head 74a with the S pole, the optical holding portion 53b pivotally attached to the shaft member 52 comes into contact with the first spacer 58a, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the insertion position. In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the third and fourth core heads 73a, 74a (see FIG. 17), the shaft member 52 and the third, fourth, In each attractive force between the core heads 73a and 74a, a component attracting in the axial direction is generated (see FIG. 19). As a result, the optical holding member 53 is drawn toward the second substrate 57 and is held at a preset retracted position (see FIG. 15).

  According to such an embodiment, the shaft member 52 is held by the housing 51 so as to be rotatable about the axis and movable back and forth in the axial direction, and the imaging optical system is accompanied with the rotation of the shaft member 52. The movable lens 35 can be displaced between an insertion position for inserting the movable lens 35 on the optical path 30 and a retracted position for retracting from the optical path, and the movable lens 35 is moved along the optical axis O of the optical path as the shaft member 52 moves forward and backward. The optical holding member 53 is axially attached to the shaft member 52 so as to be displaceable between an advance position to advance and a retract position to retract along the optical axis O of the optical path, and moreover than the peak of the magnetic field formed by the shaft member 52. A first electromagnetic drive source 54 having first and second electromagnets 67 and 68 capable of generating a magnetic field that interferes with the magnetic field of the shaft member 52 at a position offset to one side in the axial direction, and the shaft member 52 are formed. Magnetic field peak A second electromagnetic drive source 55 having third and fourth electromagnets 77 and 78 capable of generating a magnetic field that interferes with the magnetic field of the shaft member 52 at a position offset to the other side in the axial direction. With the arrangement, optical characteristics rich in variations can be realized with a simple configuration.

  That is, by making the movable lens 35 displaceable not only with respect to the insertion position and retraction position of the imaging optical system 30 with respect to the optical path, but also with respect to the advance position and the retract position in the optical axis O direction of the imaging optical system 30 With the optical unit 50, it is possible to realize optical characteristics of three or more values. More specifically, the imaging optical system 30 has optical characteristics in a state where the movable lens 35 that is an optical member is retracted from the optical path in accordance with the action of the optical unit 50, and a retracted position of the movable lens 35 on the optical path. It is possible to realize the optical characteristics in a state where the movable lens 35 is inserted into the optical path and the optical characteristics in a state where the movable lens 35 is inserted into the advance position on the optical path.

  Next, FIGS. 21 to 31 relate to a second embodiment of the present invention, FIG. 21 is an exploded perspective view of the optical unit, and FIG. 22 is a first insertion position on the optical path of the imaging optical system and the first in the optical axis direction. FIG. 23 is a plan view showing the internal structure of the optical unit in a state where the lens is disposed at a midway position, and FIG. 23 is a plan view showing the internal structure of the optical unit in a state where the lens is disposed at the retracted position from the optical path of the imaging optical system. FIG. 25 is a plan view showing the internal structure of the optical unit in a state where the lens is arranged at the insertion position on the optical path of the imaging optical system and at a second midway position in the optical axis direction, and FIG. 25 is a retracted position on the optical path of the imaging optical system; FIG. 26 is a cross-sectional view of the principal part showing the optical unit in a state where the lens is disposed at the retracted position in the optical axis direction, and FIG. 26 is an optical unit in a state where the lens is disposed at the insertion position from the optical path of the imaging optical system and at the retracted position in the optical axis direction. FIG. FIG. 28 is a cross-sectional view of the principal part showing the optical unit in a state where the lens is disposed at the insertion position on the optical path of the imaging optical system and at the first midway position in the optical axis direction, and FIG. 28 is the retracted position and light from the optical path of the imaging optical system FIG. 29 is a cross-sectional view of the main part showing the optical unit in a state where the lens is arranged at the advance position in the axial direction. FIG. 29 shows the optical unit in a state where the lens is arranged at the insertion position on the optical path of the imaging optical system and at the advance position in the optical axis direction. FIG. 30 is a fragmentary sectional view showing an optical unit in a state where a lens is arranged at the insertion position on the optical path of the imaging optical system and at a second middle position in the optical axis direction, and FIG. 31 is an electromagnetic drive source. 6 is a time chart for explaining an example of a drive current supplied to the circuit. Note that the present embodiment is mainly different from the first embodiment described above in that the movable lens 35 can be displaced in more stages between the advanced position and the retracted position. In addition, about the point similar to the above-mentioned 1st Embodiment, the same code | symbol is attached | subjected suitably and description is abbreviate | omitted.

  As shown in FIG. 21, in the present embodiment, for example, a plate-like locking plate 85 is projected from the first spacer 58a as a regulating member. For example, the locking plate 85 interferes with the optical holding portion 53b at an intermediate position set between the advanced position and the retracted position only when the optical holding member 53 is in the insertion position, and the optical holding member 53 Movement in the direction of the optical axis O can be restricted.

  Next, the operation of such an optical unit 50 will be described with reference to FIGS.

  For example, as shown in FIGS. 23 and 25, when the optical holding member 53 is in the retracted position for retracting the movable lens 35 from the optical path, the S pole of the shaft member 52 is opposed to the first and third core heads 63a and 73a. The N pole of the shaft member 52 is opposed to the second and fourth core heads 64a and 74a. In such a state, for example, when a negative current −I is supplied to the first electromagnetic drive source 54 (see timing t5 in FIG. 31), the first and second coils 65 and 66 are When excited, the first coil head 63a side is magnetized to the N pole, and the second core head 64a side is magnetized to the S pole. Then, the attractive force between the first core head 63a magnetized in the N pole and the S pole of the shaft member 52 facing the first core head 63a, and the second core head 64a magnetized in the S pole and the second Due to the attractive force of the shaft member 52 facing the core head 64a with the N pole, the optical holding portion 53b pivotally attached to the shaft member 52 comes into contact with the second spacer 58b, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the retracted position. In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the first and second core heads 63a and 64a, the shaft member 52 and the first and second core heads 63a and 64a are offset. In each attractive force between the two, a component attracting in the axial direction is generated. As a result, the optical holding member 53 is drawn toward the first substrate 56 and is held at a preset retracted position (see FIG. 25).

  Further, in the state where the optical holding member 53 is held in the retracted position and the retracted position in this way, for example, when an operator input is made to the switches 15 of the operation unit 3, the first electromagnetic drive The drive current supplied to the source 54 is switched from the negative current −I to the positive current I (see timing t5 in FIG. 31). As a result, the excited state of the first and second electromagnetic coils 65 and 66 are reversed, the first core head 63a side is magnetized to the S pole, and the second core head 64a side is magnetized to the N pole. The repulsive force between the first core head 63a magnetized in the S pole and the S pole of the shaft member 52 facing the first core head 63a, and the second core head 64a magnetized in the N pole and the second core The shaft member 52 is rotated by the repulsive force with the north pole of the shaft member 52 facing the core head 64a, and the optical holding member 53 is displaced to the insertion position for inserting the movable lens 35 on the optical path (see FIG. 26). At this time, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the first and second core heads 63a and 64a, the shaft member 52 and the first and second core heads 63a and 64a are offset. In each repulsive force between them, a component repelling in the axial direction is generated. Thereby, the optical holding member 53 is temporarily separated from the first substrate 56 side, and the sliding resistance when the shaft member 52 is rotated is reduced.

  When the optical holding member 53 is displaced to the insertion position, the S pole of the shaft member 52 is opposed to the second and fourth core heads 64a and 74a, and the N pole of the shaft member 52 is the first and third. It faces the core heads 63a and 73a. Then, the attractive force between the first core head 63a magnetized in the S pole and the N pole of the shaft member 52 facing the first core head 63a, and the second core head 64a magnetized in the N pole and the second Due to the attractive force with the S pole of the shaft member 52 facing the core head 64a, the optical holding portion 53b pivotally attached to the shaft member 52 abuts on the first spacer 58a, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the insertion position. In addition, since the peak of the magnetic field formed by the shaft member 52 is offset with respect to the first and second core heads 63a and 64a, the space between the shaft member 52 and the first and second core heads 63a and 64a. In each attractive force, a component attracting in the axial direction is generated. As a result, the optical holding member 53 is drawn toward the first substrate 56 and is held at a preset retracted position (see FIG. 26).

  Further, in the state where the optical holding member 53 is held at the insertion position and the retracted position in this way, for example, when an operator input is made to the switches 15 of the operation unit 3, the first electromagnetic drive The drive current supplied to the source 54 is turned off, and a predetermined positive current I is supplied as a drive current to the second electromagnetic drive source 55 (see timing t6 in FIG. 31). Thereby, the third and fourth electromagnetic coils 75 and 76 are excited, the third core head 73a side is magnetized to the S pole, and the fourth core head 74a side is magnetized to the N pole. Then, the attractive force between the third core head 73a magnetized at the S pole and the N pole of the shaft member 52 facing the third core head 73a, and the fourth core head 74a magnetized at the N pole and the fourth core Due to the attractive force of the shaft member 52 facing the core head 74a with the S pole, the optical holding portion 53b pivotally attached to the shaft member 52 comes into contact with the first spacer 58a, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the insertion position (see FIG. 23). In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the third and fourth core heads 73a and 74a, the shaft member 52 and the third and fourth core heads 73a and 74a are offset. In each attractive force between the two, a component attracting in the axial direction is generated. Due to this axial component, the optical holding member 53 is drawn toward the second substrate 57 side. However, the optical holding portion 53b is interfered with the locking plate 85 in the middle of the displacement from the retracted position to the advanced position. Stopped. Thereby, the optical holding member 53 is restricted from moving toward the second substrate 57, and holds the movable lens 35 at a first intermediate position set in advance (see FIG. 27).

  Further, when the optical holding member 53 is held at the insertion position and the first midway position as described above, for example, when an operation input by an operator or the like is made to the switches 15 of the operation unit 3, the second The drive current supplied to the electromagnetic drive source 55 is switched from the positive current I to the negative current −I (see timing t7 in FIG. 31). As a result, the excited bodies of the third and fourth electromagnetic coils 75 and 76 are reversed, the third core head 73a side is magnetized to the N pole, and the fourth core head 74a side is magnetized to the S pole. Then, the repulsive force between the third core head 73a magnetized in the N pole and the N pole of the shaft member 52 facing the third core head 73a, and the fourth core head 74a magnetized in the S pole and the fourth core. The shaft member 52 is rotated by the repulsive force with the S pole of the shaft member 52 facing the core head 74a, and the optical holding member 53 is displaced to the retracted position for retracting the movable lens 35 from the optical path. Further, due to the displacement of the optical holding member 53 to the retracted position, the locking body of the optical holding portion 53b and the locking plate 85 is released.

  When the optical holding member 53 is displaced to the retracted position, the S pole of the shaft member 52 is opposed to the first and third core heads 63a and 73a, and the N pole of the shaft member 52 is the second and fourth core heads. 64a and 74a. Then, the attractive force between the third core head 73a magnetized in the N pole and the S pole of the shaft member 52 facing the third core head 73a, and the fourth core head 74a magnetized in the S pole and the fourth core Due to the attractive force of the shaft member 52 facing the core head 74a with the N pole, the optical holding portion 53b pivotally attached to the shaft member 52 comes into contact with the second spacer 58b, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the retracted position. In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the third and fourth core heads 73a and 74a, the shaft member 52 and the third and fourth core heads 73a and 74a are offset. In each attractive force between the two, a component attracting in the axial direction is generated. As a result, the optical holding member 53 is drawn toward the second substrate 57 and is held at a preset advance position (see FIG. 28). That is, when the optical holding member 53 is displaced to the retracted position, the locked state between the optical holding portion 53b and the locking plate 85 is released, and between the shaft member 52 and the third and fourth core heads 73a and 74a. Since an axial component is generated in each of the attractive forces, the optical holding member 53 is displaced from the first midway position to the advanced position, and then held.

  Further, in the state where the optical holding member 53 is held at the retracted position and the advanced position as described above, for example, when an operator input is made to the switches 15 of the operation unit 3, the second electromagnetic drive The drive current supplied to the source 55 is switched from the negative current −I to the positive current I (see timing t8 in FIG. 31). As a result, the excitation states of the third and fourth electromagnetic coils 75 and 76 are reversed, the third core head 73a side is magnetized to the S pole, and the fourth core head 74a side is magnetized to the N pole. The repulsive force between the third core head 73a magnetized to the S pole and the S pole of the shaft member 52 facing the third core head 73a, and the fourth core head 74a magnetized to the N pole and the fourth core The shaft member 52 is rotated by the repulsive force with the N pole of the shaft member 52 facing the core head 74a, and the optical holding member 53 is displaced to the insertion position for inserting the movable lens 35 on the optical path (see FIG. 24). . At this time, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the third and fourth core heads 73a and 74a, the shaft member 52 and the third and fourth core heads 73a and 74a are offset. In each repulsive force between them, a component repelling in the axial direction is generated. Thereby, the optical holding member 53 is temporarily separated from the second substrate 56 side, and the sliding resistance when the shaft member 52 is rotated is reduced.

  When the optical holding member 53 is displaced to the insertion position, the S pole of the shaft member 52 is opposed to the second and fourth core heads 64a and 74a, and the N pole of the shaft member 52 is the first and third core heads. It is opposed to 63a, 73a. Then, the attractive force between the third core head 73a magnetized at the S pole and the N pole of the shaft member 52 facing the third core head 73a, and the fourth core head 74a magnetized at the N pole and the fourth core Due to the attractive force of the shaft member 52 facing the core head 74a with the S pole, the optical holding portion 53b pivotally attached to the shaft member 52 comes into contact with the first spacer 58a, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the insertion position. In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the third and fourth core heads 73a and 74a, the shaft member 52 and the third and fourth core heads 73a and 74a are offset. In each attractive force between the two, a component attracting in the axial direction is generated. As a result, the optical holding member 53 is drawn toward the second substrate 57 and is held at a preset advance position (see FIG. 29).

  Further, in the state where the optical holding member 53 is held at the insertion position and the advanced position in this way, for example, when an operator input is made to the switches 15 of the operation unit 3, the second electromagnetic drive The drive current supplied to the source 55 is turned off, and a predetermined positive current I is supplied as the drive current to the first electromagnetic drive source 54 (see timing t9 in FIG. 31). As a result, the first and second electromagnetic coils 65 and 66 are excited, the first core head 63a side is magnetized to the S pole, and the second core head 64a side is magnetized to the N pole. Then, the attractive force between the first core head 63a magnetized in the S pole and the N pole of the shaft member 52 facing the first core head 63a, and the second core head 64a magnetized in the N pole and the second Due to the attractive force with the S pole of the shaft member 52 facing the core head 64a, the optical holding portion 53b pivotally attached to the shaft member 52 abuts on the first spacer 58a, and rotation about the shaft center is prohibited. . Thereby, the optical holding member 53 is held at the insertion position (see FIG. 24). In addition, since the peak of the magnetic field formed by the shaft member 52 is offset in the axial direction with respect to the first and second core heads 63a and 64a, the shaft member 52 and the first and second core heads 63a and 64a are offset. In each attractive force between the two, a component attracting in the axial direction is generated. The optical holding member 53 is pulled toward the first substrate 56 by the component in the axial direction, but the optical holding portion 53b is interfered with the locking plate 85 in the middle of the displacement from the advanced position to the retracted position. Stopped. As a result, the optical holding member 53 is restricted from moving toward the first substrate 56, and holds the movable lens 35 at a preset second intermediate position (see FIG. 30). As is clear from comparison between FIG. 27 and FIG. 30, the second halfway position advances the movable lens 35 by the thickness of the optical holding member 53 and the locking plate 85 with respect to the first halfway position. It is a position to hold on the position side.

  According to such an embodiment, when the optical holding member 53 is in the insertion position, the locking plate 85 that can be locked with the optical holding portion 53b is provided, and the advance position and the reverse position that are the holding positions of the movable lens 35 are provided. By setting the first and second midway positions in between, it is possible to realize more varied optical characteristics.

  Next, FIGS. 32 to 38 relate to a third embodiment of the present invention, FIG. 32 is an exploded perspective view showing the configuration inside the housing of the optical unit, and FIG. 33 is a diagram in which a filter is inserted on the optical path of the imaging optical system. FIG. 34 is a plan view showing the internal structure of the optical unit in a state where the filter is retracted from the optical path of the imaging optical system, and FIG. 35 is a plan view showing the internal structure of the optical unit in the imaging optical system. FIG. 36 is a cross-sectional view of the principal part showing the optical unit inserted and the lens is disposed at the retracted position in the optical axis direction; FIG. 36 is a diagram illustrating the filter retracted from the optical path of the imaging optical system and the lens at the retracted position in the optical axis direction; FIG. 37 is a cross-sectional view of the main part showing the optical unit in an arranged state, FIG. 37 is a cross-sectional view of the main part showing a state in which the filter is retracted from the optical path of the imaging optical system and the lens is placed at the advanced position in the optical axis direction. Imaging optical system Insert the filter into the optical path, a and fragmentary cross-sectional view showing a state in which a lens in the optical axis direction of the advanced position to place. This embodiment is different from the first embodiment in that the optical filter is held by the optical holding member instead of the movable lens, and the sub optical holding member is provided separately from the optical holding member. It differs mainly. In addition, about the point similar to the above-mentioned 1st Embodiment, the same code | symbol is attached | subjected suitably and description is abbreviate | omitted.

  As shown in FIGS. 35 to 38, in this embodiment, the optical holding member 53 holds an optical filter 90 as an optical member.

  Also, for example, as shown in FIG. 32, pin holes 56e and 57e are formed in the first and second substrates 56 and 57 constituting the housing 51 at positions close to the bearing holes 56d and 57d. The guide pin 92 is held in parallel with the shaft member 52 through the pin holes 56e and 57e.

  In addition, a sub optical holding member 93 is provided in the housing 51 of the present embodiment. The sub optical holding member 93 holds an arm portion 93a whose one end side is slidably supported by the shaft member 52 and the guide pin 92, and a movable lens 95 as a sub optical member on the other end side of the arm portion 93a. An annular sub optical holding portion 93b is formed of a flat plate member integrally formed.

  Here, the sub optical holding member 93 is supported in a non-rotatable manner in the housing 51 by inserting the shaft member 52 and the guide pin 92 into the arm portion 93 a, and the movable lens 95 is always attached to the imaging optical system 30. It can be held on the optical path (insertion position).

  A stopper ring 96 is fixed to the shaft member 52, and an arm portion 93 a of the sub optical holding member 93 is interposed between the stopper ring 96 and the arm portion 53 a of the optical holding member 53. Thereby, the sub optical holding member 93 is restricted from moving in the axial direction with respect to the shaft member 52, and can be displaced between the advanced position and the retracted position integrally with the optical holding member 53.

  That is, in this embodiment, the sub optical holding member 93 holds the movable lens 95 at the insertion position of the imaging optical system independently of the rotation of the shaft member 52 and is along the optical axis of the optical filter 90. With the displacement, the movable lens 95 can be displaced between the advanced position and the retracted position (see FIGS. 33 and 34).

  In such a configuration, the optical holding member 53 is displaced between the insertion position and the retracted position and displaced between the advanced position and the retracted position by the same action as in the first embodiment. On the other hand, the sub optical holding member 93 is interlocked only with the displacement between the advanced position and the retracted position of the optical holding member 53.

  As a result, the optical unit 50 of the present embodiment has the optical filter 90 and the movable lens 95 arranged at the insertion position on the optical path of the imaging optical system 30 and at the retracted position in the axial direction (see FIG. 35). The state in which only the movable lens 95 is disposed at the insertion position of the imaging optical system 30 and the retracted position in the axial direction (see FIG. 36), and only the movable lens 95 is the insertion position of the imaging optical system 30 and A state in which the optical filter 90 and the movable lens 95 are arranged at the advance position in the axial direction (see FIG. 37), and the optical filter 90 and the movable lens 95 are arranged at the insertion position on the optical path of the imaging optical system 30 (See FIG. 38).

  According to such an embodiment, the sub optical holding member 93 is provided in addition to the optical holding member 53. The optical holding member 53 and the sub optical holding member 93 respectively provide the optical filter 90 as the optical member and the sub optical unit. By displacing the movable lens 95 as a member with respect to the optical path of the imaging optical system 30, optical characteristics rich in variations can be realized.

  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 the movable lens or the optical filter is 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 and 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 ... Universal cord, 4 ... Operation part, 5 ... Tip part, 6 ... Bending part, 7 ... Flexible pipe part, 10 ... Operation part main body, 11 DESCRIPTION OF SYMBOLS ... Folding prevention part, 13 ... Treatment instrument insertion port, 14 ... Angle lever, 15 ... Switches, 16 ... Folding prevention part, 20 ... Scope connector part, 21 ... Light source side connector, 22 ... Electric contact, 23 ... Electric connector, 25 ... Illumination optical system, 26 ... Imaging device, 27 ... Air supply / water supply channel, 28 ... Treatment instrument insertion channel, 30 ... Imaging optical system, 31 ... Lens frame, 32 ... Objective lens, 34 ... Lens, 35 ... Movable lens ( Optical member), 37 ... Imaging frame, 38 ... Image sensor, 39 ... Cover glass, 40 ... Electrical board, 41 ... Signal cable, 42 ... Driving cable, 43 ... Wiring pattern, 50 ... Optical unit, 51 ... Housing, 5 ... Shaft member, 53 ... Optical holding member, 53a ... Arm part, 53b ... Optical holding part, 54 ... First electromagnetic drive source, 55 ... Second electromagnetic drive source, 56 ... First substrate, 56a ... Circular part 56b ... rectangular portion, 56c ... opening, 56d ... bearing hole, 56e ... pin hole, 57 ... second substrate, 57a ... circular portion, 57b ... rectangular portion, 57c ... opening, 57d ... bearing hole, 57a ... Pin hole, 58a ... 1st spacer, 58b ... 2nd spacer, 61 ... Yoke, 62 ... Base member, 62a ... 1st connection part, 62b ... 2nd connection part, 63 ... 1st core arm, 63a ... 1st core head, 64 ... 2nd core arm, 64a ... 2nd core head, 65 ... 1st electromagnetic coil, 66 ... 2nd electromagnetic coil, 67 ... 1st electromagnet, 68 ... 2nd electromagnet, 71 ... Yoke, 72 ... Base member, 72a ... 1 connection part, 72b ... 2nd connection part, 73 ... 3rd core arm, 73a ... 3rd core head, 74 ... 4th core arm, 74a ... 4th core head, 75 ... 3rd electromagnetic coil, 76 ... 4th electromagnetic coil, 77 ... 3rd electromagnet, 78 ... 4th electromagnet, 80 ... Power supply control part, 85 ... Locking plate (regulation member), 90 ... Optical filter (optical member), 92 ... Guide pin 93 ... Sub optical holding member, 93a ... Arm part, 93b ... Sub optical holding part, 95 ... Movable lens (sub optical member), 96 ... Stopper ring

Claims (4)

A shaft member made of a permanent magnet magnetized on the shaft object;
A shaft holding member that holds the shaft member so as to be rotatable about an axis and capable of moving back and forth in the axial direction;
It is pivotally attached to the shaft member, and is displaceable between an insertion position for inserting the optical member on an optical path of an optical system and a retreat position for retracting the optical member from the optical path as the shaft member rotates. An optical holding that is displaceable between an advanced position where the optical member is advanced along the optical axis of the optical path and a retracted position where the optical member is retracted along the optical axis of the optical path as the shaft member moves forward and backward Members,
A first electromagnetic drive source having an electromagnet capable of generating a magnetic field that interferes with the magnetic field of the shaft member at a position offset to one side in the axial direction from the peak of the magnetic field formed by the shaft member;
A second electromagnetic drive source having an electromagnet capable of generating a magnetic field that interferes with the magnetic field of the shaft member at a position offset to the other side in the axial direction from the peak of the magnetic field formed by the shaft member ;
When the drive current is supplied, the first electromagnetic drive source moves the shaft member to one side in the axial direction due to interference between the magnetic field generated in the electromagnet and the peak of the magnetic field of the shaft member. And displacing the shaft member in different directions around the axis according to the direction of energization of the drive current,
When the drive current is supplied, the second electromagnetic drive source moves the shaft member to the other side in the axial direction due to interference between the magnetic field generated in the electromagnet and the peak of the magnetic field of the shaft member. And the shaft member is rotated in different directions around the axis according to the direction of energization of the drive current .   Only when the optical holding member is in the insertion position, the optical holding member interferes with the optical holding member at a midway position set between the advance position and the retracted position in the optical axis direction of the optical holding member. The optical unit according to claim 1, further comprising a regulating member that regulates movement.   The sub optical member is held at the insertion position of the optical system independently of the rotation of the shaft member, and the sub optical member is moved to the advanced position along with the displacement of the optical holding member along the optical axis. The optical unit according to claim 1, further comprising a sub-optical holding member that is displaceable to the retracted position.   The electromagnet of the first electromagnetic drive source includes a yoke formed of a magnetic body having first and second core arms, and first and second outer peripheral portions of the first and second core arms. An electromagnetic coil, and
  The electromagnet of the second electromagnetic drive source includes a yoke formed of a magnetic body having third and fourth core arms, and third and fourth disposed on the outer periphery of the third and fourth core arms. The optical unit according to claim 1, further comprising: an electromagnetic coil.

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