JP6278883B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus including a holding frame that holds a moving frame having an optical system therein so as to be movable in the front-rear direction of the optical axis of the optical system.

  2. Description of the Related Art An imaging device having a configuration in which a focus of an optical image on a subject is switched by moving a moving frame that holds an optical system inside the holding frame back and forth in the optical axis direction of the optical system is well known. Note that the imaging device is provided, for example, in an insertion portion of an endoscope.

  It is well known that the moving frame is moved within the holding frame by using a motor or the like. However, in this configuration, not only the moving configuration of the moving frame is complicated, but also the moving frame is moved. There was a problem that response speed was slow.

  In view of such a problem, a configuration in which a moving frame is moved using an actuator is well known. In Patent Document 1, the moving frame is provided with a protruding portion that protrudes from the outer peripheral surface of the moving frame to the outside of the holding frame, and the protruding portion is contracted by a compression coil spring and heating due to application of current and application of current is stopped. A configuration of an imaging device is disclosed in which a moving frame is moved in the optical axis direction together with a convex portion by moving in an optical axis direction using an actuator having an SMA wire that expands with cooling to room temperature. .

  Also, in Patent Document 1, an adjustment ring with which a positioning surface on the base end side of the convex portion in the optical axis direction (hereinafter simply referred to as the base end side) abuts is fitted to the outer periphery of the holding frame, and the imaging apparatus is assembled. At this time, a configuration is also disclosed in which the magnification observation position of the optical system is defined by rotating the adjustment ring to adjust the contact position in the optical axis direction of the positioning surface of the convex portion with respect to the adjustment ring.

Japanese Patent No. 5155494

  Here, a magnet is provided on the outer peripheral surface of the moving frame and an electromagnetic coil is provided on the outer peripheral surface of the holding frame, and an electric current is supplied to the electromagnetic coil to generate a magnetic field between the magnet and the electromagnetic coil. A configuration of an imaging device that moves the moving frame in the optical axis direction by a magnetic force is also well known.

  Even in an imaging apparatus having an actuator using a magnet, it is necessary to adjust the focal position of the optical system during assembly, that is, to adjust the far point or the near point. If a configuration in which the convex portion protruding outside the holding frame of the frame is brought into contact with the C-ring to adjust the focal position is used, there is a problem that the imaging device is increased in size by the convex portion.

  Moreover, since the imaging apparatus of patent document 1 is the structure which abuts the positioning surface of one convex part on an adjustment ring, and adjusts a contact position, a moving frame will incline within a holding frame after contact | abutting. There was also a problem. The tilt of the moving frame can be prevented by providing two or more convex portions on the moving frame and abutting each on the adjustment ring. However, in this configuration, the imaging device is further increased in size by the amount of the convex portions. It will become.

  The above problem is the same in the configuration in which the moving frame is moved in the optical axis direction within the holding frame using an actuator other than the magnet.

  The present invention has been made in view of the above-described problems, and provides an imaging apparatus capable of adjusting the focal position of the optical system of the moving frame at the time of assembly with a small configuration while preventing the moving frame from being tilted. For the purpose.

  In order to achieve the above object, an imaging apparatus according to an aspect of the present invention includes an optical system that forms an optical image of a subject, an imaging element that converts the optical image into a video signal, and the moving frame inside. By being movably held along the optical axis direction and fitted into the holding frame having at least two pairs of adjustment grooves facing in the direction orthogonal to the optical axis direction and the two pairs of adjustment grooves, respectively. The end of the movable frame in the direction of the optical axis, which extends so as to penetrate the holding frame in a direction perpendicular to the direction of the optical axis and is movable along the direction of the optical axis, hits the A restriction portion having a first restriction member and a second restriction member for restricting a position of the optical system along the optical axis direction, and a fixing member for fixing the moved restriction portion to the holding frame. It has.

  According to the present invention, it is possible to provide an imaging apparatus capable of realizing the adjustment of the focal position of the optical system of the moving frame at the time of assembly with a small configuration while preventing the moving frame from being tilted.

The figure which shows the external appearance of the endoscope which comprises the imaging device of 1st Embodiment. Sectional drawing which shows schematically the imaging device provided in the front-end | tip part of the insertion part of the endoscope of FIG. Sectional view of the moving frame and the tip side magnet along the line III-III in FIG. Partial sectional view of the actuator along line IV-IV in Fig. 2 Partial sectional view of the actuator along line V-V in Fig. 2 The figure which shows the modification of the shape of a pair of adjustment groove formed in the holding frame of FIG. Sectional drawing which shows schematically the structure of the modification of the imaging device which provided the connection part in the control part of FIG. Partial sectional view of the actuator along the line VIII-VIII in FIG. FIG. 4 is a partial cross-sectional view showing a modified example of an actuator in which the restricting portion is composed of three restricting members. Sectional drawing which shows schematically the structure of the imaging device of 2nd Embodiment Partial sectional view of the actuator along line XI-XI in FIG. The top view which looked at the imaging device of FIG. 10 from the XII direction in FIG. Sectional drawing which shows schematically the structure of the imaging device of 3rd Embodiment Partial sectional view of the actuator along line XIV-XIV in FIG. The top view which looked at the imaging device of FIG. 13 from the XV direction in FIG.

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

(First embodiment)
FIG. 1 is a diagram illustrating an external appearance of an endoscope including the imaging apparatus according to the present embodiment.

  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.

  The operation unit 3 is provided with a fixed lever 5 for fixing the rotation position of the up / down bending operation knob 4 and a fixing knob 7 for fixing the rotation position of the left / right bending operation knob 6.

  Further, the operation unit 3 is provided with a zoom lever 10 that moves a moving frame 40 (both see FIG. 2) in an actuator 100 of an imaging device 150 described later.

  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 in the optical axis direction L (hereinafter simply referred to as the distal end side) of an optical system 41 (see FIG. 2) described later. It is provided and is formed in an elongated shape.

  The bending portion 2w is bent in, for example, the four directions of 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, so that an imaging device 150, which will be 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.

  In addition, an imaging device 150 is provided in a distal end portion 2s provided continuously with the distal end side of the bending portion 2w.

Next, the configuration of the imaging device 150 will be described with reference to FIGS.
2 is a cross-sectional view schematically showing an imaging device provided in the distal end portion of the insertion portion of the endoscope of FIG. 1, and FIG. 3 is a moving frame and a magnet on the distal end side along the line III-III in FIG. 4 is a partial sectional view of the actuator taken along line IV-IV in FIG. 2, and FIG. 5 is a partial sectional view of the actuator taken along line VV in FIG.

  As shown in FIG. 2, the imaging device 150 includes an actuator 100 that moves a moving frame 40 (to be described later) along the optical axis direction L, and a rear side of the optical axis direction L from the actuator 100 (hereinafter simply referred to as a rear side). The image pickup device 110 located in the position is provided.

  As shown in FIGS. 2 to 5, the actuator 100 includes a holding frame 30, a moving frame 40, an outer frame 50, a regulating portion 55, and a fixing member 200, and a main portion is configured. Yes.

  As shown in FIGS. 2 to 4, the moving frame 40 holds an optical system 41 that forms an optical image of a subject inside. Note that a plurality of lenses (not shown) that form an optical image of the subject together with the optical system 41 may be provided between the optical system 41 and the image sensor 110 in the optical axis direction L.

  As shown in FIG. 2, the moving frame 40 has a circumferential groove 40 h with a predetermined length along the optical axis direction L with respect to the outer periphery.

  On the outer peripheral surface of the moving frame 40, magnets 60 a to 60 d are provided circumferentially along the circumferential direction C at approximately 90 ° intervals, as shown in FIG. 3, at the distal end side of the portion formed by the groove 40 h. Yes. In addition, magnets 70a to 70d (magnets 70b and 70d are not shown) are circumferentially formed along the circumferential direction C, spaced rearwardly from the magnets 60a to 60d on the base end side of the portion formed by the groove 40h. Are provided at approximately 90 ° intervals.

  Incidentally, the magnets 60a to 60d and 70a to 70d are provided in the portion formed by the groove 40h on the outer peripheral surface of the moving frame 40. If there is no groove 40h, the magnets 60a to 60d and 70a to 70d are provided. This is because the moving frame 40 increases in diameter in the radial direction K orthogonal to the optical axis direction L.

  2 and 3, in the radial direction K, the magnets 60a to 60d have an S pole magnetized on the inner peripheral side and an N pole magnetized on the outer peripheral side.

  2, only the magnets 70a and 70c are illustrated in the magnets 70a to 70d, but in the radial direction K, the N pole is magnetized on the inner peripheral side and the S pole is magnetized on the outer peripheral side. Has been. That is, the magnetizing directions of the magnets 60a to 60d and the magnets 70a to 70d are opposite to each other.

  If the magnets 60a to 60d and the magnets 70a to 70d have opposite magnetization directions, the magnets 60a to 60d are magnetized with an N pole on the inner peripheral side and an S pole on the outer peripheral side. The magnets 70a to 70d may be magnetized such that the S pole is magnetized on the inner peripheral side and the N pole is magnetized on the outer peripheral side.

  As shown in FIGS. 2 to 4, the holding frame 30 is formed in an elongated cylindrical shape along the optical axis direction L, and in the tip of the optical axis direction L (hereinafter simply referred to as the tip), An objective lens 31 that forms an optical image of a subject together with the optical system 41 is held.

  The holding frame 30 holds the moving frame 40 movably forward and rearward (hereinafter referred to as front and rear) along the optical axis direction L behind the objective lens 31 inside.

  Further, on the outer peripheral surface 30g of the holding frame 30, an outward flange 30a is formed on the distal end side, and an outward flange 30b is formed on the proximal end side behind the outward flange 30a.

  Further, on the outer peripheral surface 30g of the holding frame 30, between the outward flange 30a and the outward flange 30b in the optical axis direction L, specifically, within the movable range of the magnets 60a to 60d and the magnets 70a to 70d in the optical axis direction L. The coils 21 and 22 that generate driving force with respect to the moving frame 40 when energized are wound around the circumference.

  That is, the coils 21 and 22 are provided to face the magnets 60a to 60d and the magnets 70a to 70d with the holding frame 30 interposed in the radial direction K.

  Note that the coil 21 is wound on the distal end side of the coil 22 on the outer peripheral surface 30g. Further, the coil 21 and the coil 22 are wound in opposite directions, and the direction of the current supplied to the coil 21 is opposite to the direction of the current supplied to the coil 22.

  As a result, when currents having different directions are supplied to the coils 21 and 22, the magnets 60a to 60d and the magnets 70a to 70d have opposite magnetization directions, so that the magnets 60a to 60d and the magnets 70a to 70d. The driving force generated for 70d acts in the same direction according to Fleming's left-hand rule. The moving frame 40 moves forward or backward in the holding frame 30 by switching the direction of the current flowing through the coil 21 and the coil 22. As the moving frame 40 moves, the focus of the subject in the endoscope 1 is switched.

  The four magnets 60a to 60d and 70a to 70d are equally provided at substantially 90 ° intervals in the circumferential direction C on the outer peripheral surface 40g because the magnets 60a to 60d, This is because the magnetic force applied to 70a to 70d is made uniform in the entire circumferential direction of the outer peripheral surface 40g, that is, in a plurality of directions constituting the radial direction K.

  Therefore, in consideration of this, three magnets may be provided at the front and rear of the outer circumferential surface 40g at approximately 120 ° intervals evenly in the circumferential direction C, and five or more magnets are equally provided. Alternatively, it may be continuously formed in a circumferential shape.

  In addition, since the moving structure to the optical axis direction L of the moving frame 40 using the coils 21 and 22 and the magnets 60a-60d and 70a-70d is known, the detailed description is abbreviate | omitted.

  Here, as shown in FIGS. 2, 4, and 5, in the holding frame 30, a pair of adjustment grooves 30 h 1 and a pair that are opposed to each other in the radial direction K between the coil 22 and the outward flange 30 b in the optical axis direction L. The adjustment groove 30h2 is formed.

  Each of the adjustment grooves 30h1 and 30h2 penetrates the holding frame 30 in the radial direction K, has a predetermined length in the optical axis direction L, and has a planar shape that is linear. Further, the formation position and the formation range in the optical axis direction L of the pair of adjustment grooves 30h1 and the pair of adjustment grooves 30h2 with respect to the holding frame 30 are the same. In other words, the pair of adjustment grooves 30h1 and the pair of adjustment grooves 30h2 are located in the same position in the optical axis direction L and parallel to the radial direction K, as shown in FIG.

  The restricting portion 55 includes a first restricting member 51 and a second restricting member 52, and a main portion is configured. The first restricting member 51 and the second restricting member 52 are each composed of a rod-like member having a length penetrating at least the holding frame 30 in the radial direction K from a nonmagnetic material such as SUS. When the actuator 100 is an actuator using a magnet other than the magnet, the restricting portion 55 does not need to be made of a nonmagnetic material.

  As shown in FIGS. 2, 4, and 5, the first restricting member 51 extends through the holding frame 30 in the radial direction K by being fitted into the pair of adjustment grooves 30 h 1. . Further, the second restricting member 52 extends through the holding frame 30 in the radial direction K by being fitted into the pair of adjustment grooves 30h2. Therefore, the first restricting member 51 and the second restricting member 52 are located in parallel with the radial direction K at the same position in the optical axis direction L.

  The first restricting member 51 is movable back and forth in the optical axis direction L in the pair of adjustment grooves 30 h 1 when the actuator 100 is assembled, and the second restricting member 52 is also assembled with the actuator 100. At this time, it is movable back and forth in the optical axis direction L within the pair of adjustment grooves 30h2.

  The first restricting member 51 and the second restricting member 52 are along the optical axis direction L of the optical system 41 when the end of the moving frame 40 on the image pickup element side, that is, the end 40t on the base end side abuts. That is, the position along the optical axis direction L of the moving frame 40 is regulated. Therefore, in the present embodiment, the end 40t of the moving frame 40 is configured to abut against the two regulating members 51 and 52.

  Note that the end 40 s on the distal end side of the moving frame 40 abuts against a ring-shaped regulating member 99 provided on the inner peripheral surface of the holding frame 30. That is, the moving frame 40 is movable in the range of the optical axis direction L between the position where the end 30 s contacts the restriction member 99 and the position where the end 40 t contacts the restriction 55 in the holding frame 30. It has become.

  As shown in FIGS. 2, 4, and 5, the outer frame 50 is configured by a waterproof cover that covers the outer periphery of the holding frame 30 along the optical axis direction L and at least holds the holding frame 30 in a watertight manner. And made of a non-magnetic material such as SUS. When the actuator 100 is an actuator using a magnet other than the magnet, the outer frame 50 does not need to be made of a nonmagnetic material.

  2, a pair of through holes 50h1 that penetrate the outer frame 50 in the radial direction K are formed in the outer frame 50 at positions facing the pair of adjustment grooves 30h1 of the holding frame 30 in the radial direction K. In the outer frame 50, a pair of through holes 50h2 penetrating the outer frame 50 in the radial direction K are formed at positions opposed to the pair of adjustment grooves 30h2 of the holding frame 30 in the radial direction K.

  The formation positions in the optical axis direction L of the pair of through holes 50h1 and the pair of through holes 50h2 with respect to the outer frame 50 are the same. That is, the pair of through holes 50h1 and the pair of through holes 50h2 are aligned at the same position in the optical axis direction L and are positioned in parallel with the radial direction K.

  Both ends of the first restricting member 51 in the radial direction K are fitted into the pair of through holes 50h1, and are fixed by soldering or brazing. Further, both ends of the second restricting member 52 in the radial direction K are fitted into the pair of through holes 50h2, and are fixed by soldering or brazing.

  As a result, the outer frame 50 can move forward and backward together with the first restriction member 51 and the second restriction member 52 when the actuator 100 is assembled. As a result, the outer frame 50 holds the holding frame 30 provided therein so as to be relatively movable back and forth.

  Note that, as described above, the first restriction member 51 and the second restriction member 51 have the same formation position in the optical axis direction L between the pair of through holes 50h1 and the pair of through holes 50h2 with respect to the outer frame 50. The position of the regulating member 52 in the optical axis direction L is also the same.

  The fixing member 200 is moved together with the outer frame 50 in the pair of adjusting grooves 30h1 and 30h2 by fixing the outer frame 50 after the movement to the outward flanges 30a and 30b of the holding frame 30 when the actuator 100 is assembled. The first restricting member 51 and the second restricting member 52 are fixed to the holding frame 30, and an adhesive or the like is used.

  The image sensor 110 converts an optical image into a video signal via the objective lens 31 and the optical system 41, and is composed of a CCD or the like.

  Next, the operation of the present embodiment will be described. Specifically, a method for adjusting the focal position of the optical system 41 included in the moving frame 40 when the actuator 100 is assembled will be described.

  First, in a state where the objective lens 31 is fixed in the holding frame 30 and the moving frame 40 is positioned, the operator penetrates the pair of adjustment grooves 30h1 in the radial direction K with respect to the pair of adjustment grooves 30h1. Thus, the first restriction member 51 is fitted, and the second restriction member 52 is fitted into the pair of adjustment grooves 30h2 so as to penetrate the pair of adjustment grooves 30h2 in the radial direction K.

  Next, the operator inserts and fixes both ends in the radial direction K of the first restricting member 51 into the pair of through holes 50h1 of the outer frame 50 covered on the outer periphery of the holding frame 30, and fixes the outer frame. Both ends of the second restricting member 52 in the radial direction K are fitted into and fixed to the pair of 50 through holes 50h2.

  After that, the operator moves the outer frame 50 back and forth to move the first restricting member 51 and the second restricting member 52 back and forth at the same time in the adjustment grooves 30h1 and 30h2. The contact position in the optical axis direction L of the end 40t of the moving frame 40 is adjusted. That is, the focal position of the optical system 41, specifically, the far point or the near point is adjusted.

  After adjusting the focal position of the optical system 41, the operator finally fixes the outer frame 50 to the outward flanges 30 a and 30 b of the holding frame 30 using the fixing member 200. Thus, the contact position of the end 40t of the moving frame 40 with respect to the restricting portion 55 is defined. That is, the focal position of the optical system 41 is defined.

  Since other methods for assembling the actuator 100 are well known, description thereof will be omitted.

  Thus, in the present embodiment, when assembling the actuator 100, the first restriction is inserted into the pair of adjustment grooves 30h1 and 30h2 formed in the holding frame 30 and penetrates the holding frame 30 in the radial direction K. By moving the member 51 and the second restricting member 52 back and forth using the outer frame 50, the member 51 and the second restricting member 52 are simultaneously moved back and forth in the pair of adjusting grooves 30h1 and 30h2, and the first restricting member at the end 40t of the moving frame 40 is moved. It has been shown that the imaging apparatus 150 has a configuration for adjusting the contact position of the optical system 41 by adjusting the contact positions of the optical system 41 and the second restricting member 52.

  According to this, the operator can easily adjust the contact position of the end portion 40t with respect to the restricting portion 55, that is, the focal position of the optical system 41, only by moving the outer frame 50. Since it is not necessary to provide the moving frame 40 with a convex portion that protrudes outside the holding frame 30 in the radial direction K as in the prior art, the imaging apparatus is not increased in size.

  Further, the end 40t of the moving frame 40 comes into contact with the two restricting members 51 and 52 provided at the same position in the optical axis direction L with at least two points. The moving frame 40 does not tilt in the holding frame 30.

  From the above, it is possible to provide the imaging device 150 that can adjust the focal position of the optical system 41 of the moving frame 40 during assembly with a small configuration while preventing the moving frame 40 from being tilted.

  Hereinafter, a modification will be described with reference to FIG. 6 is a view showing a modification of the shape of the pair of adjustment grooves formed in the holding frame of FIG.

  In the present embodiment described above, the pair of adjustment grooves 30h1 and 30h2 has a predetermined length in the optical axis direction L and has a planar shape that is linear, and moves the outer frame 50 back and forth. Thus, both ends in the radial direction K are fixed to the outer frame 50, and the first regulating member 51 and the second regulating member 52 that penetrate the pair of adjusting grooves 30h1 and 30h2 in the radial direction K are connected to a pair of linear shapes. It has been shown that it is moved back and forth in the adjustment grooves 30h1, 30h2.

  Not limited to this, as shown in FIG. 6, each of the pair of adjustment grooves 30 h 1 and 30 h 2 has a planar shape formed in a partial arc shape, and by rotating the outer frame 50, each of the pair of arc shapes The first restriction member 51 and the second restriction member 52 may be simultaneously moved back and forth along the shape of the side faces 30h1s and 30h2s of the adjustment grooves 30h1 and 30h2.

  As described above, as the outer frame 50 rotates, the planes of the pair of adjustment grooves 30h1 and 30h2 that simultaneously move the first restricting member 51 and the second restricting member 52 back and forth using the side surfaces 30h1s and 30h2s. Needless to say, the shape is not limited to a partial arc shape, and may be other shapes such as a triangle.

  According to such a configuration, since the first restricting member 51 and the second restricting member 52 can be moved back and forth simultaneously by rotating the outer frame 50, as in the present embodiment described above. The moving positions of the first restricting member 51 and the second restricting member 52 are smaller than in the configuration in which the outer restricting member 50 is moved forward and backward to move the first restricting member 51 and the second restricting member 52 forward and backward. Adjustment is easy. Other effects are the same as those of the present embodiment described above.

  Further, in the above-described embodiment and the configuration shown in FIG. 6, the movement of the first restricting members 51 and 52 in the pair of adjustment grooves 30 h 1 and 30 h 2 is performed using the outer frame 50. Although not limited to this, without using the outer frame 50, the operator directly and individually moves the first restricting member 51 and the second restricting member 52 back and forth to the same position, and then adjusts each pair. Of course, the first restricting member 51 and the second restricting member 52 may be fixed to the holding frame 30 by filling the fixing members 200 into the grooves 30h1 and 30h2.

  Hereinafter, another modification will be described with reference to FIGS. 7 is a cross-sectional view schematically showing a configuration of a modified example of the imaging device in which the connecting portion is provided in the restricting portion in FIG. 2, and FIG. 8 is a partial cross-sectional view of the actuator along the line VIII-VIII in FIG. It is.

  As shown in FIGS. 7 and 8, the restricting portion 55 connects the first restricting member 51 and the second restricting member 52 and has a connecting portion 80 configured, for example, in a circular tube shape from a nonmagnetic material. It doesn't matter. In the case where the actuator 100 is an actuator using a magnet other than the magnet, the connecting portion 80 does not need to be made of a nonmagnetic material.

  As shown in FIG. 7, the connecting portion 80 has a portion that protrudes from the first restricting member 51 and the second restricting member 52 toward the end portion 40 t.

  The connecting portion 80 is a portion to which the end portion 40t of the moving frame 40 abuts in the holding frame 30, and has the same function as the first restricting member 51 and the second restricting member 52 described above. Yes.

  According to such a configuration, in the above-described embodiment, as shown in FIG. 2, the pair of adjustment grooves 30 h 1 and 30 h 2 are formed behind the coil 22 with respect to the holding frame 30. The contact position of the end 40t of the moving frame 40 with respect to the restricting portion 55 must also be behind the coil 22.

  However, as shown in FIG. 7, by bringing the end portion 40 t into contact with the connecting portion 80 having a portion protruding toward the end portion 40 t, the contact position of the end portion 40 t with respect to the restriction portion 55 is set in the coil 22. Since the position can also be set, the degree of freedom of the contact position of the end 40t with respect to the restricting portion 55 in the holding frame 30 is higher than that in the present embodiment described above. Other effects are the same as those of the present embodiment described above.

  Hereinafter, another modification will be described with reference to FIG. FIG. 9 is a partial cross-sectional view showing a modified example of an actuator in which the restricting portion of FIG. 4 is composed of three restricting members.

  In the present embodiment described above, in the holding frame 30, a pair of adjustment grooves 30h1 and a pair of adjustment grooves 30h2 that are opposed to the radial direction K are formed between the coil 22 and the outward flange 30b in the optical axis direction L. I showed that.

  The restricting portion 55 includes a first restricting member 51 and a second restricting member 52 to form a main portion, and the first restricting member 51 is fitted into the pair of adjustment grooves 30h1. Therefore, the second restricting member 52 extends through the holding frame 30 in the radial direction K by being fitted into the pair of adjustment grooves 30h2. Indicated to extend.

  Not only this, but as shown in FIG. 9, in the holding frame 30, between the coil 22 and the outward flange 30b in the optical axis direction L, a pair of adjustment grooves 30h1 and a pair of adjustment grooves 30h2 facing in the radial direction K. Further, three pairs of adjustment grooves such as a pair of adjustment grooves 30h3 may be formed.

  Even in this case, each of the adjustment grooves 30h1, 30h2, and 30h3 penetrates the holding frame 30 in the radial direction K and has a predetermined length in the optical axis direction L so that the planar shape is linear. ing.

  Further, the formation position and the formation range in the optical axis direction L of the pair of adjustment grooves 30h1, the pair of adjustment grooves 30h2, and the pair of adjustment grooves 30h3 with respect to the holding frame 30 are the same. That is, the pair of adjustment grooves 30 h 1, the pair of adjustment grooves 30 h 2, and the pair of adjustment grooves 30 h 3 are aligned at the same position in the optical axis direction L and are positioned parallel to the radial direction K.

  The restricting portion 55 includes a first restricting member 51, a second restricting member 52, and a rod-like member having a length penetrating at least the holding frame 30 in the radial direction K from a nonmagnetic material such as SUS. The third restricting member 53 is provided to constitute a main part. In addition, when the actuator 100 is an actuator using other than a magnet, the third regulating member 53 does not need to be made of a nonmagnetic material.

  The first restricting member 51 is fitted into the pair of adjusting grooves 30h1, so that the first restricting member 51 extends through the holding frame 30 in the radial direction K, and the second restricting member 52 is formed in the pair of adjusting grooves 30h2. By being inserted, it extends so as to penetrate the holding frame 30 in the radial direction K, and the third restricting member 53 is inserted in the pair of adjustment grooves 30 h 3, so that the holding frame 30 is extended in the radial direction K. It extends to penetrate. As a result, as shown in FIG. 9, the restricting members 51 to 53 are inserted into the adjustment grooves 30 h 1 to 30 h 3 so as to have a substantially equilateral triangle.

  Further, both ends of each regulating member 51 to 53 in the radial direction K are fixed to the outer frame 50, and each regulating member 51 to 53 is moved along the front and rear of the outer frame 50 when the actuator 100 is assembled. Within the pair of adjusting grooves 30h1 to 30h3, the optical grooves can be moved back and forth simultaneously in the optical axis direction L.

  Each of the regulating members 51 to 53 regulates the position along the optical axis direction L of the optical system 41, that is, the position along the optical axis direction L of the moving frame 40, when the end 40 t of the moving frame 40 abuts. To do. Therefore, in this structure, the edge part 40t of the moving frame 40 is the structure contact | abutted with respect to the three regulating members 51-53. Other configurations are the same as those of the present embodiment described above.

  According to such a configuration, according to the above-described embodiment, the focal position of the optical system 41 is adjusted by bringing the end 40t of the moving frame 40 into contact with the two regulating members 51 and 52. In contrast to the configuration, in FIG. 9, the end portion 40 t is brought into contact with the three regulating members 51 to 53 to adjust the focal position of the optical system 41. It can prevent more reliably that the moving frame 40 inclines.

  Further, in the present embodiment described above, the restricting portion 55 is composed of two restricting members 51 and 52, so that the diameter of the optical system 41 is set to the outer periphery of the optical system 41 as shown in FIG. 4. When the extending position of each restricting member 51, 52 is moved outward in the radial direction K so as not to overlap the optical system 41, the end 40t is restricted. The members 51 and 52 abut against the restricting portion 55 at at least two points.

  However, in the configuration shown in FIG. 9, the restricting portion 55 is composed of three restricting members 51 to 53, and therefore, even in the same case, the end portion 40 t is opposed to the restricting members 51 to 53. Since the contact with the restricting portion 55 is made at a minimum of three points, the inclination of the moving frame 40 in the holding frame 30 can be suppressed as compared with the above-described embodiment.

  Other effects are the same as those of the present embodiment described above. Further, the number of restricting members is not limited to three, and may be composed of three or more. Even when three or more restricting members are used, each restricting member may be moved back and forth with the rotation of the outer frame 50 as shown in FIG.

(Second Embodiment)
10 is a cross-sectional view schematically showing the configuration of the image pickup apparatus of the present embodiment, FIG. 11 is a partial cross-sectional view of the actuator along the line XI-XI in FIG. 10, and FIG. 12 is the image pickup apparatus of FIG. It is the top view seen from the XII direction in FIG.

  The configuration of the imaging apparatus according to the second embodiment is obtained by swinging the restricting portion when assembling the actuator, as compared with the imaging apparatus according to the first embodiment shown in FIGS. The difference is that the contact position of the end of the moving frame with respect to the restricting portion is different.

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

  As shown in FIGS. 10 to 12, in the present embodiment, the adjustment groove 30h1 includes an adjustment groove 30h1a, an adjustment groove 30h1b that faces the adjustment groove 30h1a and is longer in the optical axis direction L than the adjustment groove 30h1a. It is composed of

  The adjustment groove 30h2 includes an adjustment groove 30h2b and an adjustment groove 30h2a that faces the adjustment groove 30h2b and is longer in the optical axis direction L than the adjustment groove 30h2b.

  In the radial direction K, the adjustment groove 30h1a is formed side by side on the same side as the adjustment groove 30h2a, and the adjustment groove 30h1b is formed side by side on the same side as the adjustment groove 30h2b.

  Both ends of the first restricting member 51 in the radial direction K are fitted in the adjusting grooves 30h1a and 30h1b, and the first restricting member 51 is formed by balls 51t formed at the end on the adjusting groove 30h1a side. It is caught on the outer peripheral surface 30 g of the holding frame 30.

  Therefore, when the ball 51t is gripped and swung by the operator, the first regulating member 51 uses the ball 51t as a fulcrum and the proximal end of the adjustment groove 30h1b and the proximal end in the optical axis direction L (hereinafter simply referred to as the proximal end). ) In the range between

  Further, both ends of the second restricting member 52 in the radial direction K are fitted into the adjusting grooves 30h2a and 30h2b, and the second restricting member 52 is formed by balls 52t formed at the end on the adjusting groove 30h2b side. Is caught on the outer peripheral surface 30 g of the holding frame 30. As shown in FIGS. 10 and 11, the ball 51 t and the ball 52 t are located approximately 180 ° apart in the circumferential direction C of the holding frame 30.

  Therefore, when the ball 52t is gripped and swung by the operator, the second restricting member 52 swings in a range between the front end and the base end of the adjustment groove 30h2a with the ball 52t as a fulcrum.

  In the present embodiment, the first restricting member 51 and the second restricting member 52 are assumed to be linear members such as piano wires.

  Further, the surface 51a of the first restricting member 51 on the moving frame 40 side and the surface 52a of the second restricting member 52 on the moving frame 40 side are at least at the same position in the optical axis direction L with the end 40t of the moving frame 40 being at least. It constitutes the surface that abuts at two points.

  In the present embodiment, the imaging device 150 is not provided with the outer frame 50. Other configurations are the same as those in the first embodiment described above.

  Hereinafter, the operation of the present embodiment will be described. Specifically, a method for adjusting the focal position of the optical system 41 included in the moving frame 40 when the actuator 100 is assembled will be described.

  First, in a state where the objective lens 31 is fixed in the holding frame 30 and the moving frame 40 is positioned, the operator penetrates the pair of adjustment grooves 30h1 in the radial direction K with respect to the pair of adjustment grooves 30h1. In this manner, the first restricting member 51 is fitted from the adjustment groove 30h1a side. After the insertion, the ball 51t is caught on the outer peripheral surface 30g of the holding frame 30 on the adjustment groove 30h1a side.

  Thereafter, the operator inserts the second regulating member 52 into the pair of adjustment grooves 30h2 from the adjustment groove 30h2b side so as to penetrate the pair of adjustment grooves 30h2 in the radial direction K. After the insertion, the ball 52t is caught on the outer peripheral surface 30g of the holding frame 30 on the adjustment groove 30h2b side.

  Next, the operator swings the first restricting member 51 with the ball 51t as a fulcrum, and swings the second restricting member 52 at the same angle as the first restricting member 51 with the ball 52t as a fulcrum. .

  In addition, when the first restricting member 51 and the second restricting member are swung to change the swing angle, the inclination angles of the surface 51a and the surface 52a are changed, so that the moving frame 40 is moved relative to the surface 51a and the surface 52a. The contact position in the optical axis direction L of the end 40t is different.

  Using this, the operator swings the first restricting member 51 and the second restricting member 52 to adjust the contact position of the end portion 40t with respect to the surface 51a and the surface 52a. That is, the focal position of the optical system 41, specifically, the far point or the near point is adjusted.

  After the adjustment of the focal position of the optical system 41, the operator finally fixes the end portions of the first restriction member 51 and the second restriction member 52 to the adjustment grooves 30h1b and 30h2a by bonding, brazing, or the like. To do.

  At this time, the gaps of the adjustment grooves 30h1a, 30h1b, 30h2a, and 30h2b are also filled with an adhesive or the like, and the portions of the regulation members 51 and 52 that protrude from the adjustment grooves 30h1b and 30h2a to the outside of the holding frame 30 are cut.

  Thus, the contact position of the end 40t of the moving frame 40 with respect to the restricting portion 55 is defined. That is, the focal position of the optical system 41 is defined.

  Since other methods for assembling the actuator 100 are well known, description thereof will be omitted.

  According to such a configuration, even if the outer frame 50 is not used, only the first regulating member 51 and the second regulating member 52 are swung using the balls 51t and 52t, and the first regulating member 51 and The contact position of the end 40t of the moving frame 40 with respect to the second restricting member 52, that is, the focal position of the optical system 41 can be easily adjusted.

  Also in the present embodiment, since the end 40t of the moving frame 40 is brought into contact with the two restricting members 51 and 52 at the same position in the optical axis direction L, the moving frame 40 after contact is formed. It is also possible to prevent the inclination of.

  Further, even without using the outer frame 50 formed of a waterproof cover, the watertightness in the holding frame 30 can be easily ensured only by filling each adjustment groove 30h1a, 30h1b, 30h2a, 30h2b with an adhesive or the like. it can.

  Other effects are the same as those of the first embodiment described above.

(Third embodiment)
13 is a cross-sectional view schematically showing the configuration of the image pickup apparatus of the present embodiment, FIG. 14 is a partial cross-sectional view of the actuator along the XIV-XIV line in FIG. 13, and FIG. 15 is the image pickup apparatus of FIG. It is the top view seen from the XV direction in FIG.

  The configuration of the imaging apparatus of the third embodiment is different from that of the imaging apparatus of the first embodiment shown in FIGS. 1 to 5 and the imaging apparatus of the second embodiment shown in FIGS. And the point by which the control member is comprised from three pin-shaped members differs.

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

  As shown in FIG. 14, in the holding frame 30, three adjustment grooves 130 h 1, 130 h 2, and 130 h 3 are formed at substantially rearward positions in the circumferential direction C so as to penetrate the holding frame 30 at a position behind the coil 22. ing.

  Each of the adjustment grooves 130h1 to 130h3 is inclined from the outside toward the inside in the radial direction K. Specifically, the adjustment grooves 130h1 to 130h3 are inclined so that the hole diameter decreases from the outer peripheral surface 30g of the holding frame 30 toward the inner peripheral surface. Each of the tapered surfaces is formed, and as shown in FIG. 15, the taper surface is long and narrow in the circumferential direction C, and the hole diameter increases toward the direction C1 (in FIG. 15, in the adjustment groove). 130h2 and 130h3 are not shown).

  Further, as shown in FIG. 14, the adjustment groove 130 h 1 has a pin-shaped member 81, which is a restricting portion 55 having a tapered surface that is tapered toward the inside of the holding frame 30, on the inner side in the radial direction K. The pin-like member 82 which is a restricting portion 55 having a tapered surface which is tapered toward the inside of the holding frame 30 is inserted in the adjustment groove 130h2 in the radial direction. A pin-like member that is a restriction member 55 that is fitted in a state of being biased toward the inside of K, and that has a tapered surface that is tapered toward the inside of the holding frame 30 in the adjustment groove 130h3. 83 is inserted in a state of being urged toward the inner side in the radial direction K.

  In addition, since the taper surface of each pin-shaped member 81-83 contact | abuts to the taper surface of each adjustment groove | channel 130h1-130h3, in each adjustment groove | channel 130h1-130h3, each pin-shaped member 81-83 is a contact surface. It is positioned in a stable state with a large.

  The pin-shaped members 81 to 83 can protrude from the adjustment grooves 130h1 to 130h3 toward the inner side in the radial direction K in the holding frame 30, and the surfaces 81t, 82t on the moving frame 40 side of the tapered surfaces. 83t (the surfaces 82t and 83t are not shown) constitutes a surface against which the end 40t of the moving frame 40 abuts as shown in FIG.

  As shown in FIGS. 13 and 14, the pin-shaped members 81 to 83 are disposed on the outer periphery in the radial direction K of the pin-shaped members 81 to 83 in the circumferential direction in the adjustment grooves 130 h 1 to 130 h 3. An adjustment ring 90 to be moved to C is fitted. The adjusting ring 90 moves in the circumferential direction C in the adjusting grooves 130h1 to 130h3 integrally with the pin-shaped members 81 to 83.

  Also in this embodiment, the outer frame 50 is not provided. Other configurations are the same as those of the first and second embodiments described above.

  Hereinafter, the operation of the present embodiment will be described. Specifically, a method for adjusting the focal position of the optical system 41 included in the moving frame 40 when the actuator 100 is assembled will be described.

  First, in a state where the objective lens 31 is fixed in the holding frame 30 and the moving frame 40 is positioned, the operator fits the adjustment ring 90 to the outer peripheral surface 30g of the holding frame 30 to each pin-like member. 81 to 83 are dropped into the adjustment grooves 130h1 to 130h3.

  As a result, the tapered surfaces of the pin-shaped members 81 to 83 abut on the tapered surfaces of the adjustment grooves 130h1 to 130h3. At this time, the pin-shaped members 81 to 83 are biased inward in the radial direction K using a jig (not shown).

  In this state, when the operator rotates the adjustment ring 90, each of the adjustment grooves 130h1 to 130h3 is increased in the circumferential direction C toward the direction C1, as shown in FIG. As the pin-shaped members 81 to 83 move toward the direction C1 in each of the adjustment grooves 130h1 to 130h3, the amount of protrusion inward in the radial direction K increases, and as the pin-shaped members 81 to 83 move toward the direction C2, the radial direction K increases. The amount of protrusion to the inside is reduced.

  Therefore, when the protruding amount of each pin-shaped member 81 to 83 is varied, the contact position in the optical axis direction L of the end 40t of the moving frame 40 with respect to the surfaces 81t to 83t is different.

  In addition, when each pin-shaped member 81-83 moves to the radial direction K, it moves in the state which the taper surface of each pin-shaped member 81-83 and the taper surface of each adjustment groove | channel 130h1-130h3 contact | abutted. Accordingly, each pin-shaped member 81 to 83 moves greatly in the radial direction K with respect to the movement in the circumferential direction C.

  Using this fact, the operator rotates the adjustment ring 90 to adjust the contact position of the end 40t with respect to the surfaces 81t to 83t. That is, the focal position of the optical system 41, specifically, the far point or the near point is adjusted.

  After the adjustment of the focal position of the optical system 41, the operator finally fixes, for example, the pin-shaped members 81 to 83 to the adjustment ring 90 in the adjustment grooves 130h1 to 130h3.

  Thus, the contact position of the end 40t of the moving frame 40 with respect to the restricting portion 55 is defined. That is, the focal position of the optical system 41 is defined.

  Since other methods for assembling the actuator 100 are well known, description thereof will be omitted.

  According to such a configuration, even if the outer frame 50 is not used, it is only necessary to adjust the protruding amount of each pin-shaped member 81 to 83 using the adjustment ring 90, and the moving frame 40 with respect to each pin-shaped member 81 to 83 is adjusted. The contact position of the end 40t, that is, the focal position of the optical system 41 can be easily adjusted.

  Also in this embodiment, since the end portion 40t of the moving frame 40 is brought into contact with the three pin-shaped members 81 to 83 at the same position in the optical axis direction L, the moving frame after contact is obtained. A tilt of 40 can also be prevented.

  Further, even without using the outer frame 50 formed of a waterproof cover, the watertightness in the holding frame 30 can be easily ensured only by filling the adjustment grooves 130h1 to 130h3 with an adhesive or the like.

  The other effects are the same as those of the first and second embodiments described above. In this embodiment, three pin-shaped members are shown as an example, but it is needless to say that two or three or more pin-shaped members may be used.

  Further, modifications will be shown below. In the present embodiment described above, each of the adjustment grooves 130h1 to 130h3 is shown to have a circumferential tapered surface in the radial direction K.

  Not limited to this, it is conceivable that the thickness of the holding frame 30 is thin and a taper surface cannot be formed in the radial direction K for each of the adjustment grooves 130h1 to 130h3, but even if a taper surface can be formed, If the thickness of the holding frame 30 is thin, the effect of the tapered surface described above can hardly be obtained. Therefore, even if there is no tapered surface in the radial direction K, as a result, substantially the same effect as in the above-described embodiment can be obtained. it can.

  In the first to third embodiments described above, the actuator 100 has been exemplified by the actuator using the magnets 60a to 60d, 70a to 70d and the coils 21 and 22. However, the present invention is not limited to this. Of course, the present invention can also be applied to the configuration of the imaging device 15 using another actuator such as a shape memory alloy or an ultrasonic motor.

  In the first to third embodiments described above, it has been shown that the focal position of the optical system 41 is adjusted by the end portion 40t coming into contact with the restricting portion 55. However, the present invention is not limited to this, and the restricting portion 55 is not limited thereto. Needless to say, this is also applicable to the case where the focal position of the optical system 41 is adjusted by providing the front side of the end 40s on the front end side of the moving frame 40 and the end 40s abutting against the end 40s.

  Furthermore, in the first to third embodiments described above, the imaging device 150 is described as being provided in the endoscope 1, but not limited thereto, and is applicable even when provided in a camera or the like. Is possible.

DESCRIPTION OF SYMBOLS 30 ... Holding frame 30h1 ... A pair of adjustment groove 30h2 ... A pair of adjustment groove 40 ... Moving frame 40t ... End part by the side of an image pick-up element of a moving frame 41 ... Optical system 50 ... Outer frame 51 ... 1st control member 52 ... 2nd 3 ... 3rd regulating member 55 ... regulating part 80 ... connecting part 100 ... actuator 110 ... imaging element 150 ... imaging device 200 ... fixing member K ... radial direction (direction orthogonal to optical axis direction)
L ... Optical axis direction

Claims (8)

An optical system for forming an optical image of a subject;
An image sensor for converting the optical image into a video signal;
A moving frame having the optical system therein;
A holding frame that holds the moving frame inside the optical system in a movable manner along the optical axis direction of the optical system and has at least two pairs of adjustment grooves facing in a direction orthogonal to the optical axis direction;
The movable frame is inserted into the two pairs of adjustment grooves so as to extend through the holding frame in a direction perpendicular to the optical axis direction and to be movable along the optical axis direction. A regulating portion having a first regulating member and a second regulating member for regulating the position of the optical system along the optical axis direction by applying an end in the optical axis direction;
A fixing member for fixing the restricting portion after movement to the holding frame;
An imaging apparatus comprising:   The imaging device according to claim 1, wherein the restriction portion is abutted against the end portion on the imaging element side in the optical axis direction of the moving frame. By fixing the end of the regulating member in the direction perpendicular to the optical axis direction, the regulating member can be moved together with the regulating member in the optical axis direction, and the holding frame is disposed inside the optical axis direction. And further comprising an outer frame that is relatively movable.
The imaging apparatus according to claim 1, wherein the fixing member fixes the moved restricting portion to the holding frame by fixing the outer frame after moving to the holding frame.   The imaging apparatus according to claim 3, wherein the outer frame is a waterproof cover that holds at least the holding frame in a watertight manner. The adjustment grooves are formed in three pairs so as to face the holding frame in a direction perpendicular to the optical axis direction,
The restricting portion is inserted into the three pairs of adjustment grooves together with the first restricting member and the second restricting member so as to extend through the holding frame in a direction perpendicular to the optical axis direction. A third restriction that restricts the position of the optical member along the optical axis direction by contacting an end of the movable frame in the optical axis direction that is present and movable along the optical axis direction; The imaging apparatus according to claim 1, further comprising a member. The restricting portion further includes a connecting portion for connecting at least two restricting members,
The imaging apparatus according to claim 1, wherein the end portion of the moving frame in the optical axis direction is abutted against the connecting portion.   The imaging device according to claim 6, wherein the connecting portion protrudes toward the end in the optical axis direction of the moving frame in the optical axis direction from at least two of the regulating members.   The imaging apparatus according to claim 1, further comprising an actuator that moves the moving frame along the optical axis direction.

Images