WO2019012697A1 - Stereoscopic optical unit, stereoscopic imaging device, and stereoscopic endoscope - Google Patents

Abstract

A stereoscopic optical unit 32 comprising: a moving frame 32 having two objective optical systems 33, 34 arranged side-by-side therein; a drive unit 10 that drives the moving frame 32 forward and backwards in a direction along the optical axes O1, O2 of the two objective optical systems 33, 34; a pair of aperture members 61, 62 movably provided on the object side of the moving frame 32 and having openings 65, 66; and interlocking device mechanisms 71, 72 that interlock the pair of aperture members 61, 62 in accordance with the forward/back movement of the moving frame 32 by the drive unit 10 and move the openings 65, 66 in a direction orthogonal to the optical axes O1, O2 of the two objective optical systems 33, 34.

Description

Stereoscopic optical unit, stereoscopic imaging apparatus and stereoscopic endoscope

The present invention relates to a stereoscopic optical unit having a movable lens frame, a stereoscopic imaging device having the stereoscopic optical unit and a stereoscopic endoscope.

2. Description of the Related Art In recent years, an endoscope apparatus capable of observing a test site which can not be directly visually observed by inserting an elongated insertion portion into a body cavity or the like has been widely used.

In a typical endoscope apparatus, it is difficult to observe, for example, fine irregularities on the surface of a body cavity wall, because the test site can be viewed only as a flat surface without perspective. Diagnosis by endoscopic observation, There was a problem that various measures could not be made easy.

Therefore, a plurality of observation optical systems may be provided in parallel, and the observation optical system may be disposed so as to have parallax by setting convergence angles formed by the imaging optical axes of the plurality of optical systems, and stereoscopically view the observation region There is known a stereoscopic endoscope apparatus which can be used.

In such a stereoscopic endoscope, for example, a camera having a stereoscopic imaging optical system as disclosed in Japanese Patent Application Laid-Open No. 2012-113281 is incorporated.

By the way, with regard to the three-dimensional effect of a three-dimensional image, it is desirable that the optimal three-dimensional effect differs depending on the distance to the subject, and the parallax is small when the object is close and large when the object is far.

However, in the configuration in which the distance between the entire left and right optical systems is moved in order to reduce or increase the parallax, the size of the imaging device increases.

Therefore, the conventional stereoscopic imaging optical system constitutes a binocular optical system having a variable stereo base (distance between principal rays of right and left optical systems) optimum for a camera, and an imaging apparatus equipped with this binocular optical system Then, since the stereo base can be changed according to the shooting conditions, it is possible to easily acquire a stereoscopic image capable of comfortable stereoscopic vision.

Specifically, two parallel optical systems are provided, and drive means is provided to drive the position of the stop disposed in each optical system. The stereo base is adjusted by decentering these diaphragms to adjust the three-dimensional effect.

As described above, according to the conventional stereoscopic imaging optical system, by decentering the stop, the stereoscopic base can be made narrower or wider than the optical axis interval of the two optical systems, and a stereoscopic image capable of comfortable stereoscopic vision. I am trying to get

Further, the conventional camera calculates parallax information from images obtained from the left and right imaging elements, and performs feedback by an image driving an aperture so as to be an optimal stereo base.

However, in the conventional stereoscopic imaging optical system, when calculating the amount for driving the diaphragm, the image of the left and right optical systems acquired by the imaging device is obtained by processing, and there is a problem that the system becomes complicated.

Furthermore, in the conventional stereoscopic imaging optical system, since it is necessary to move the diaphragm and the focus lens separately, the unit of the imaging apparatus becomes large. That is, in the prior art, although stereoscopic effect adjustment with sufficient parallax can be achieved, since the diaphragm and the focus each have a drive mechanism, the size can not be reduced, and the diameter and size of the insertion portion can be reduced. Had the problem of being unsuitable.

Therefore, the present invention has been made in view of the above circumstances, and provides a stereoscopic optical unit, a stereoscopic image pickup apparatus, and a stereoscopic endoscope which can be miniaturized with a simple configuration and can achieve optimal stereoscopic vision. The purpose is that.

A stereoscopic optical unit according to one aspect of the present invention includes a moving frame in which two objective optical systems are juxtaposed, and a driving unit that drives the moving frame in a direction along the optical axis of the two objective optical systems. A pair of diaphragm members movably provided on the object side or the imaging side of the moving frame and having an opening, and the pair of diaphragm members interlocked according to the advancing and retracting movement of the moving frame by the drive unit, And an interlocking drive mechanism for moving the aperture in a direction orthogonal to the optical axes of the two objective optical systems.

A stereoscopic imaging apparatus according to an aspect of the present invention includes a moving frame in which two objective optical systems are juxtaposed, and a driving unit that drives the moving frame in a direction along the optical axis of the two objective optical systems. A pair of diaphragm members movably provided on the object side or the imaging side of the moving frame and having an opening, and the pair of diaphragm members interlocked according to the advancing and retracting movement of the moving frame by the drive unit, A stereoscopic drive unit having an interlock drive mechanism for moving the aperture in a direction orthogonal to the optical axes of the two objective optical systems, and an imaging device for receiving light of the stereoscopic drive unit Do.

A stereoscopic endoscope according to one aspect of the present invention includes a moving frame in which two objective optical systems are juxtaposed, and a driving unit that drives the moving frame in a direction along an optical axis of the two objective optical systems. And a pair of diaphragm members movably provided on the object side or the imaging side of the moving frame and having an opening, and interlocking the pair of diaphragm members according to forward and backward movement of the moving frame by the drive unit, A stereoscopic optical unit having an interlocking drive mechanism for moving the aperture in a direction orthogonal to the optical axes of the two objective optical systems, and an image pickup device for receiving the light of the stereoscopic optical unit A stereoscopic image pickup apparatus is provided.

A perspective view showing the configuration of an endoscope A schematic view showing a stereoscopic imaging device provided at the tip of the insertion portion A schematic view showing a moving lens unit driven by an actuator Front view showing the moving frame Top view showing the moving frame Front view showing a moving lens unit in a state where a fixing portion is provided Top view showing the movable lens unit in a state in which the fixing portion is provided Front view showing a moving lens unit in a state in which two diaphragms are provided Top view showing the moving lens unit with two stops Front view showing a moving lens unit in which a light shielding plate is provided and two diaphragms are in close proximity Top view showing the moving lens unit in a state in which a shading plate is provided and two diaphragms are in close proximity Front view showing a moving lens unit in which a light shielding plate is provided and two diaphragm blades are separated Top view showing the moving lens unit in a state in which a light shielding plate is provided and two diaphragms are separated Front view showing a moving lens unit in a state in which two squeezing wings are separated Sectional view showing a state in which two squeegees overlap Front view showing a moving lens unit in a state in which two diaphragms of the first modification are close to each other Top view showing the moving lens unit in a state in which two diaphragms of the first modification are close to each other Front view showing a moving lens unit in a state in which two frangible wings of the first modification are separated Top view showing the movable lens unit in a state in which the two diaphragms of the first modification are separated Front view showing a moving lens unit in a state in which two diaphragms of the second modification are close to each other Top view showing the moving lens unit in a state in which two diaphragms of the second modification are close to each other Front view showing a moving lens unit in a state in which two frangible wings of the second modification are separated Top view showing the movable lens unit in a state in which the two diaphragms of the first modification are separated Front view showing a moving lens unit in a state in which two diaphragms of the third modification are close to each other Top view showing the moving lens unit in a state in which two diaphragms of the third modification are close to each other Front view showing a moving lens unit in a state in which two diaphragms of the third modification are separated Top view showing the moving lens unit in a state in which the two diaphragms of the third modification are separated Front view showing a moving lens unit in a state in which two diaphragms of the fourth modification are close to each other Top view showing the moving lens unit in a state in which two diaphragms of the fourth modification are close to each other Front view showing a moving lens unit in a state in which two diaphragms of the fourth modification are separated Top view showing the moving lens unit in a state in which the two diaphragms of the fourth modification are separated Front view showing a moving lens unit in a state in which two diaphragms of the fifth modification are close to each other Top view showing the moving lens unit in a state in which two diaphragms of the fifth modification are close to each other Front view showing a moving lens unit in a state in which two diaphragms of the fifth modification are separated Top view showing the moving lens unit in a state in which the two diaphragms of the fifth modification are separated

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the configuration of an endoscope, FIG. 2 is a schematic view showing a stereoscopic imaging device provided at the distal end of the insertion portion, and FIG. 3 is a schematic view showing a moving lens unit driven by an actuator. 4 is a front view showing the moving frame, FIG. 5 is a top view showing the moving frame, FIG. 6 is a front view showing the moving lens unit in the state in which the fixing portion is provided, and FIG. 7 is a movement in the state in which the fixing portion is provided 8 is a front view showing a moving lens unit in a state in which two diaphragms are provided, and FIG. 9 is a top view in which a moving lens unit in a state in which two diaphragms are provided. 10 is a front view showing a moving lens unit in which a light shielding plate is provided and two diaphragms are in close proximity, and FIG. 11 is a top view showing a moving lens unit in which a light shielding plate is provided and two diaphragms are in proximity , FIG. 12 is provided with a light shielding plate, 2 FIG. 13 is a front view showing the moving lens unit in a state where the squeezing wings are separated, FIG. 13 is a top view showing the moving lens unit in a state in which two light blocking plates are separated and the two squeezing wings are separated, FIG. 15 is a front view showing the moving lens unit in a separated state, and FIG. 15 is a cross-sectional view showing a state in which two diaphragms overlap.

In each of the drawings used in the following description, in order to make each component have a size that can be recognized in the drawings, there is a case where the scale is different for each component. Further, the present invention is not limited only to the number of components described in the drawings, the shapes of the components, the ratio of the sizes of the components, and the relative positional relationship between the components.

As shown in FIG. 1, a stereoscopic endoscope (hereinafter sometimes referred to simply as an endoscope) 1 has a long insertion portion 2 and an operation portion 3 connected to the proximal end of the insertion portion 2. And a light guide connector 4 connected to a light source device (not shown) and a video connector 5 connected to a video system center (not shown).

In the endoscope 1, the operation unit 3 and the light guide connector 4 are connected via the flexible cable 6, and the light guide connector 4 and the video connector 5 are connected via the communication cable 7.

In the insertion portion 2, a distal end portion 11 mainly formed of a hard member such as stainless steel or hard resin, a curved portion 12, and a rigid tube 13 mainly made of stainless steel or a metal tube such as stainless steel are continuously provided in order from the distal end. The insertion portion 2 is a portion to be inserted into the body, and various cables for communication and driving, a light guide (not shown) for transmitting illumination light, and the like are incorporated inside.

The operation unit 3 is provided with angle levers 14 and 15 for remotely operating the bending unit 12, a light source device, and various switches 16 for operating the video system center and the like. The angle levers 14 and 15 are bending operation means capable of operating the bending portion 12 of the insertion portion 2 in four directions, up, down, left, and right. The endoscope 1 of the present embodiment is a rigid endoscope apparatus in which most of the insertion portion 2 other than the bending portion 12 is rigid. The endoscope 1 may be a flexible endoscope apparatus in which the insertion portion 2 is soft.

Next, a stereoscopic imaging device (hereinafter abbreviated as an imaging device) 30 disposed at the distal end portion 11 of the insertion portion 2 will be described based on FIGS. 2 and 3.
As shown in FIG. 2, the imaging device 30 is disposed in the distal end portion 11, and a composite cable 31 in which various cables for communication and driving are bundled is extended rearward. The composite cable 31 is inserted and disposed in the insertion portion 2, and is electrically connected to the video connector 5 from the operation portion 3 via the flexible cable 6 and the communication cable 7.

The imaging device 30 is provided with a plurality of objective optical systems that constitute a binocular lens for acquiring a stereoscopic image. The imaging device 30 is provided with a moving lens unit 32 as a stereoscopic optical unit having a moving frame 35 holding the two moving lenses 33 and 34 among the plurality of objective optical systems. The moving lenses 33 and 34 held by the moving frame are not limited to two.

Further, as shown in FIG. 3, the imaging device 30 is provided with two imaging elements 21 and 22 on which the light of the optical axes O1 and O2 collected by the plurality of objective optical systems is incident. It has a circuit board (not shown) to which elements 21 and 22 are electrically connected.

Note that the imaging device is a very small electronic component, and a plurality of elements that output an electrical signal according to incident light at a predetermined timing are arranged in a planar light receiving unit, and, for example, in general A format called a CCD (charge coupled device), a CMOS (complementary metal oxide semiconductor) sensor or the like, or other various formats are applied.

Then, an imaging signal photoelectrically converted by the two imaging elements 21 and 22 is generated and output as a video signal by the circuit board. That is, in the present embodiment, an optical image (an endoscopic view image) captured by the two imaging elements 21 and 22 is transmitted to the video connector 5 (see FIG. 1) as a video signal.

Moreover, the imaging device 30 can also make an imaging element into one by light-receiving two lights condensed with the several objective optical system by a big imaging element, dividing | segmenting into an image on either side, and processing it.

In addition, although the endoscope apparatus 1 of this Embodiment is what is called 3D endoscope which can make the image of a subject into a stereo image, Since the principle etc. which produce the stereo image are known, I omit explanation.

In the fixed frame (not shown) of the imaging device 30, the movable lens unit 32 is disposed movably in the direction along the optical axes O1 and O2 of the two movable lenses 33 and 34 (direction FB in the figure) There is.

As described above, the moving lens unit 32 holds the two moving lenses 33 and 34 in parallel, in which the moving frame 35 is an objective optical system. The moving frame 35 is disposed inside a fixed frame (not shown) so as to be able to move forward and backward.

In the moving frame 35, a total of four permanent magnets 38a, 38b, 39a, 39b are arranged in a predetermined magnetization direction in the separating direction.

In addition, coils 23, 24 are disposed to face the permanent magnets 38a, 38b, 39a, 39b. Each of the coils 23 and 24 is fixed to a fixed frame (not shown) by an adhesive or the like, is electrically connected to the electric cable in the composite cable 31, and the direction of the generated electric field is switched. Switch.

Further, the moving frame 35 of the moving lens unit 32 is provided with a rectilinear guide in the advancing and retracting direction to move along the optical axes O1 and O2 in a fixed frame (not shown) by a guide or the like not shown.

Thus, the voice coil is formed by the permanent magnets 38a, 38b, 39a, 39b fixed to the moving frame 35, and the coils 23, 24 switching the attraction and repulsion to the permanent magnets 38a, 38b, 39a, 39b. A motor (hereinafter, abbreviated as VCM) is configured, and an actuator 10 as a drive unit for advancing and retracting the moving lens unit 32 is configured.

In the present embodiment, the configuration of the actuator 10 using the VCM for moving the moving frame 35 forward and backward by the two coils 23 and 24 is illustrated, but the present invention is not limited to this. Alternatively, a permanent magnet that is paired with the coil may be provided only on one side of the moving frame 35.

Furthermore, the actuator 10 for driving the moving frame 35 back and forth is not limited to the VCM, and may be a driving unit such as a stepping motor or an SMA wire that expands and contracts by electric heating. The operation lever 3 may be provided in the operation unit 3 (see FIG. 1) to drive the movable frame 35 forward and backward by pulling and loosening the wire.

Next, the moving lens unit 32 of the present embodiment provided in the imaging device 30 will be described in detail below based on FIG.
In the moving lens unit 32, as shown in FIGS. 4 and 5, permanent magnets 38a, 38b, 39a, 39b are provided on a moving frame 35 provided on upper and lower surfaces as viewed in the plane of the drawing, and It has two moving lenses 33 and 34 as a pair of left and right held so as to be juxtaposed.

Here, the moving frame 35 is formed to be laterally long in cross-sectional shape and arc-shaped on both sides, and is formed of a nonmagnetic member such as hard resin or nonmagnetic metal or a magnetic member. The moving frame 35 has two arm portions 41 and 42 extending forward from both upper sides.

The two arms 41 and 42 are provided with first pins 43 and 44 arranged to project upward.

The two moving lenses 33, 34 held by the moving frame 35 are juxtaposed in the left-right direction as viewed in the plane of the drawing, and here, the cross-sectional shape is horizontally long and both side portions are formed in an arc. .

Then, as shown in FIGS. 6 and 7, in the moving lens unit 32, the fixing portion 51 as a first light shielding mask formed in a plate shape is disposed opposite to the tip surface of the moving frame 35. The lower portion of the fixing portion 51 is formed in a stepped shape, and is fixed to a fixing frame (not shown).

The fixed portion 51 has openings 52 and 53 which are two windows for exposing a part of the movable lenses 33 and 34, two first bearings 54 juxtaposed to the lower side of the plate surface, and an upper surface A second bearing 55 juxtaposed inside the two arms 41 and 42 of the moving frame 35 is formed. The two openings 52 and 53 have an elongated hole shape in the left-right direction in which both side portions are formed in an arc shape.

As shown in FIGS. 8 and 9, on the tip end surface 51a of the fixed portion 51, two swinging wings 61 and 62, which are a pair of narrowing members, turn around pivot shafts 63 and 64 provided at the lower end. It is arranged freely. The pivot shafts 63 and 64 are attached to the first bearing 54 of the fixed portion 51, respectively.

The two diaphragms 61 and 62 are formed with openings 65 and 66 which are perfect circular diaphragm holes, and the shape is set such that the overlapping portion does not enter the other openings 65 and 66 at the time of close rotation. In addition, second pins 67 and 68 are provided at upper ends of the two diaphragms 61 and 62.

The two second pins 67 and 68 are engaged with link portions 71 and 72 which constitute an interlocking drive mechanism provided on the left and right of the upper surface side of the fixed portion 51. The two link portions 71 and 72 are pivotable around pivot shafts 73 and 74 attached to the second bearings 55 disposed inside the two arm portions 41 and 42 of the movable frame 35. Are located in

The two link portions 71 and 72 are substantially L-shaped, and pivoting shafts 73 and 74 are provided at bent portions. The first long holes 75 and 76 in which the first pins 43 and 44 of the moving frame 35 are respectively engaged with the free ends of the two link portions 71 and 72, and the second ones of the diaphragms 61 and 62. The second long holes 77 and 78 are formed in which the pins 67 and 68 of the second embodiment are inserted.

The moving lens unit 32 is mounted on the object side so that a light shielding plate 81 as a second light shielding mask faces the two diaphragm blades 61 and 62, as shown in FIGS.

The light shielding plate 81 is formed with openings 82 and 83 in the left-right direction in which both side portions exposing the openings 65 and 66 of the diaphragm wings 61 and 62 are formed in an arc shape. The light shielding plate 81 is fixed to the fixing portion 51 by a fixing member (not shown) such as a screw provided with a spacer so as not to inhibit the rotation of the diaphragm wings 61 and 62.

Here, in the moving lens unit 32 configured as described above, when the moving frame 35 moves forward (in the direction of arrow F) to the object side by the actuator 10 of the VCM, the two link portions 71 and 72 pivot By pivoting around 63, 64, the free ends provided with the second elongated holes 77, 78 move toward the center side where they approach each other (the state shown in FIG. 11).

That is, when the moving frame 35 moves forward on the object side, the first pins 43 and 44 of the moving frame 35 engaged in the first long holes 75 and 76 also move forward on the object side. . As a result, the two link portions 71 and 72 are interlocked with the movement of the moving frame 35 as the free ends of the first long holes 75 and 76 formed in the first pins 43 and 44 are pushed forward. To rotate.

And the free end provided with the second long holes 77 and 78 of the two link portions 71 and 72 has the second pins 67 and 68 of the incorporated diaphragm wings 61 and 62 at the center side. Move inward in the left and right direction. As a result, the two diaphragms 61 and 62 are pivoted around the pivots 63 and 64 and move inward in the left-right direction, which is the center side in the direction in which the two approach each other (shown in FIGS. 8 and 10). State).

Therefore, the openings 65 and 66 of the two fluctuating wings 61 and 62 are moved in the approaching direction, the distance between them narrows, and the distance between the two chief rays having the optical axes O1 and O2 narrows. That is, the openings 65 and 66 of the two diaphragms 61 and 62 move close to each other in the direction orthogonal to the optical axes O1 and O2, and the predetermined separation distance L1 of the light flux centers (O1 and O2) entering Becomes short (see FIG. 11).

On the other hand, as shown in FIG. 12 and FIG. 13, when the moving frame 35 moves rearward (in the direction of arrow B) on the image side, which is the opposite side to the object side, the two link portions 71 and 72 move. By pivoting around the pivots 63 and 64, the free ends provided with the second elongated holes 77 and 78 move outward in the lateral direction in which they are separated from each other.

At this time, when the moving frame 35 moves backward on the image side, the first pins 43 and 44 of the moving frame 35 engaged in the first long holes 75 and 76 also move backward on the image side. Do. As a result, the two link portions 71 and 72 are interlocked with the movement of the moving frame 35 by pulling the free ends of the first pins 43 and 44 in which the first long holes 75 and 76 are formed to the rear side. To rotate.

The free ends of the two link portions 71 and 72 where the second long holes 77 and 78 are provided are the second pins 67 and 68 of the hooks 61 and 62 engaged. Move away in the left-right direction. As a result, as shown in FIG. 14, the two swinging wings 61 and 62 are pivoted around the pivots 63 and 64, and move outward, which is a direction in which the two are separated.

Therefore, the openings 65 and 66 of the two diaphragms 61 and 62 are moved in the direction away from each other, the distance between them is increased, and the distance between chief rays having the optical axes O1 and O2 is increased. That is, the two diaphragms 61 and 62 move away from each other in the direction orthogonal to the optical axes O1 and O2, so that the centers of the openings 65 and 66 are separated and enter the light flux center (O1 and O2). The predetermined separation distance L2 of O2) becomes long (see FIG. 13).

The position of the movable frame can be detected and controlled by a position sensor (not shown) and its peripheral circuit so that an optimum focus and three-dimensional effect can be obtained even at any position other than the stopper position.

By the way, the positions of the openings 65 and 66 are deviated along the optical axes O1 and O2 due to their respective thicknesses. Therefore, as shown in FIG. 15, in each of the diaphragms 61 and 62, the step portions 61a and 62a are formed in the overlapping portions, and the surfaces thereof are positioned substantially in the same plane. As a result, the amounts of the two lights incident on the moving lenses 33 and 34 after passing through the openings 65 and 66 of the diaphragms 61 and 62 become substantially the same.

Further, the endoscope 1 has a configuration in which the moving lens 33, 34 of the moving lens unit 32 is used as a focusing lens, and the two diaphragms 61, 62 are driven synchronously with the movement of the moving frame 35 So that the predetermined separation distance L1 between the openings 65 and 66 of the two fluctuating wings 61 and 62 becomes short during near point observation in focus, and in the case of far point observation in which the far point is in focus By setting the two diaphragms 61 and 62 in synchronization with the movement of the moving frame 35 so that the predetermined separation distance L2 of the openings 65 and 66 becomes long, the three-dimensional effect and the focus of the 3D image can be obtained. By adjusting at the same time, it is possible to obtain a good 3D image stereoscopic effect.

Furthermore, the endoscope 1 uses the movable lenses 33 and 34 of the movable lens unit 32 as zoom lenses, and the predetermined separation distance L1 of the openings 65 and 66 of the two diaphragms 61 and 62 is short during near point observation. By driving the two diaphragms 61 and 62 in synchronization with the movement of the moving frame 35 so that the predetermined separation distance L2 of the openings 65 and 66 becomes long in the far-point observation. The three-dimensional effect of a good 3D image can be obtained.

As described above, in the endoscope 1 of the present embodiment, the two diaphragms 61 and 62 have a link mechanism in conjunction with the forward and backward movement of the moving frame 35 of the moving lens unit 32 incorporated in the imaging device 30. By driving by this, predetermined separation distances L1 and L2 of two light flux centers (optical axes O1 and O2) which become principal rays for stereoscopic vision are variable.

As a result, since the endoscope 1 mechanically sets the amount of driving the diaphragms 61 and 62 of the movable lens unit 32, the number of driving sources, position sensors, etc. can be reduced, and image processing can be performed. There is no need to construct a complex system such as driving control of a driving source based on the above.

The moving lens unit 32 can drive the moving frame 35 and the diaphragms 61 and 62 with one actuator 10, so that the unit of the imaging device 30 can be miniaturized. Therefore, by preventing the enlargement of the imaging device 30 incorporated in the distal end portion 11, the enlargement of the distal end portion 11 is also prevented, and the configuration is also applicable to the endoscope 1 having the insertion portion 2 with a reduced diameter.

According to the above description, the stereoscopic endoscope 1 is provided with the stereoscopic imaging device 30 incorporating the moving lens unit 32, which is a stereoscopic optical unit that can be miniaturized with a simple configuration and can achieve optimal stereoscopic vision. Can.

(First modification)
FIG. 16 is a front view showing a moving lens unit in a state in which two diaphragms of the first modification are in proximity to each other, and FIG. 17 is a view of the moving lens unit in a state in which two diaphragms of the first modification are in proximity to each other. FIG. 18 is a front view showing the moving lens unit in a state in which the two diaphragms of the first modification are separated from each other. FIG. 19 is a movable lens unit in a state in which the two diaphragms of the first modification are separated from each other. Is a top view showing FIG.

As shown in FIGS. 16 and 17, the moving lens unit 32 of this modification is configured such that the moving frame 35 is provided on the front side of the two diaphragm wings 61 and 62, and the moving frame 35 By moving rearward (in the direction of arrow B) on the image side, the openings 65 and 66 of the two diaphragms 61 and 62 may be moved in the direction in which they approach.

As a result, the distance between the two diaphragms 61 and 62 narrows, and the centers of the two diaphragms 61 and 62 move close to each other in the direction orthogonal to the optical axes O1 and O2, and the predetermined separation of the light flux centers (O1 and O2) enters The distance L1 becomes short (see FIG. 17).

On the other hand, at the time of far-point observation, as shown in FIG. 18 and FIG. 19, the moving lens unit 32 moves 2 forward by moving the moving frame 35 to the object side (arrow F direction) opposite to the object side. The two diaphragms 61 and 62 move outward in the direction in which they move away from each other.

As a result, the openings 65 and 66 of the two diaphragms 61 and 62 are spaced apart from each other, and the centers of the openings 65 and 66 move away from each other in the direction orthogonal to the optical axes O1 and O2. The predetermined separation distance L2 of the light flux centers (O1 and O2) which are separated from each other at the center thereof is increased (see FIG. 18).

Here, the objective optical system is set such that when the moving frame 35 moves backward, the near point is in focus and when the moving frame 35 moves forward, the far point is in focus. It is a thing. Even with such a configuration, it is possible to provide the stereoscopic endoscope 1 including the stereoscopic imaging device 30 having the same function and effect as the above-described embodiment.

(Second modification)
FIG. 20 is a front view showing a moving lens unit in a state in which two diaphragms of the second modification are in proximity to each other, and FIG. 21 is a diagram showing the moving lens unit in a state in which two diaphragms of the second modification are in proximity to each other. FIG. 22 is a front view showing the moving lens unit in a state in which the two diaphragms of the second modification are separated from each other. FIG. 23 is a movable lens unit in a state in which the two diaphragms of the first modification are separated from each other. Is a top view showing FIG.

As shown in FIGS. 20 and 21, the moving lens unit 32 according to the present modification has a configuration in which the second bearing 55 is provided outside the two arm portions 41 and 42 of the moving frame 35 in the fixed portion 51. By moving the moving frame 35 rearward (in the direction of the arrow B) on the image side during near point observation, the openings 65 and 66 of the two fluctuating wings 61 and 62 move in the direction in which they approach.

As a result, the distance between the two diaphragms 61 and 62 narrows, and the centers of the two diaphragms 61 and 62 move close to each other in the direction orthogonal to the optical axes O1 and O2, and the predetermined separation of the light flux centers (O1 and O2) enters The distance L1 becomes short (see FIG. 21).

On the other hand, in the moving lens unit 32, as shown in FIGS. 22 and 23, at the time of far-point observation, the moving frame 35 moves forward (in the direction of arrow F) on the object side to move the two diaphragms 61 and 62. It becomes the structure which moves to the outward side which is a direction which mutually separates.

As a result, the openings 65 and 66 of the two diaphragms 61 and 62 are spaced apart from each other, and the centers of the openings 65 and 66 move away from each other in the direction orthogonal to the optical axes O1 and O2. The predetermined separation distance L2 of the light flux centers (O1, O2) where the centers are apart and light is incident (see FIG. 23).

Here, the objective optical system is set such that when the moving frame 35 moves backward, the near point is in focus and when the moving frame 35 moves forward, the far point is in focus. It is a thing. Even with such a configuration, it is possible to provide the stereoscopic endoscope 1 including the stereoscopic imaging device 30 having the same function and effect as the above-described embodiment.

(Third modification)
FIG. 24 is a front view showing a moving lens unit in a state in which two diaphragms of the third modification are in proximity to each other, and FIG. 25 is a front view of the moving lens unit in a state in which two diaphragms of the third modification are in proximity to each other. FIG. 26 is a front view showing the moving lens unit in a state in which the two diaphragms of the third modification are separated from each other. FIG. 27 is a movable lens unit in the state in which two diaphragms of the third modification are separated from each other. Is a top view showing FIG.

As shown in FIGS. 25 and 26, the moving lens unit 32 according to the present modification is provided with the moving frame 35 on the front side of the two diaphragm wings 61 and 62, and the two arms of the moving frame 35 in the fixed portion 51. As a configuration in which the second bearing 55 is provided outside the portions 41 and 42, the moving frame 35 moves forward (in the direction of the arrow F) on the object side at the time of near point observation. The openings 65 and 66 of 62 move in the approaching direction.

As a result, the distance between the two diaphragms 61 and 62 narrows, and the centers of the two diaphragms 61 and 62 move close to each other in the direction orthogonal to the optical axes O1 and O2, and the predetermined separation of the light flux centers (O1 and O2) enters The distance L1 becomes short (see FIG. 26).

On the other hand, in the moving lens unit 32, as shown in FIG. 27 and FIG. 28, at the time of far point observation, the moving frame 35 moves rearward (in the direction of arrow B) on the image side to move the two diaphragms 61 and 62. It becomes the structure which moves to the outward side which is a direction which mutually separates.

As a result, the openings 65 and 66 of the two diaphragms 61 and 62 are spaced apart from each other, and the centers of the openings 65 and 66 move away from each other in the direction orthogonal to the optical axes O1 and O2. The predetermined separation distance L2 of the light flux centers (O1 and O2) which are separated from each other at the center thereof is increased (see FIG. 28).

Here, the objective optical system is set such that when the moving frame 35 moves forward, the near point is in focus and when the moving frame 35 moves backward, the far point is in focus. It is a thing. Even with such a configuration, it is possible to provide the stereoscopic endoscope 1 including the stereoscopic imaging device 30 having the same function and effect as the above-described embodiment.

(The 4th modification)
FIG. 29 is a front view showing a moving lens unit in a state in which two diaphragms of the fourth modification are in proximity to each other, and FIG. 30 is a view of the moving lens unit in a state in which two diaphragms in the fourth modification are in proximity to each other. FIG. 31 is a front view showing a moving lens unit in a state in which two diaphragms of the fourth modification are separated, and FIG. 32 is a mobile lens unit in a state in which two diaphragms of the fourth modification are separated. Is a top view showing FIG.

In the movable lens unit 32 of this modification, as shown in FIGS. 29 and 30, the two diaphragm plates 56 and 57, which are a pair of diaphragm members, slide in the recess 26 formed on the object-side surface of the fixed portion 25. Is configured to

Specifically, the two diaphragms 56 and 57 are formed with openings 58 and 59 which are perfect circular diaphragm holes. Cam pins 84 and 85 are provided above and below the two diaphragms 56 and 57, respectively.

These two diaphragm plates 56, 57 are arranged side by side in the recess 26 of the fixed portion 25 and are formed in the fixed portion 25 in a rail groove (not shown) in which four claws 56a, 57a are formed to project vertically and horizontally. It is taken care of. As a result, sliding movement of the two diaphragms 56 and 57 in the direction orthogonal to the optical axes O1 and O2 is guided, and the two diaphragms 56 and 57 are not separated from the fixed portion 25.

The moving frame 35 is provided with plate-like portions 46 extended on the front side, which is the object side, vertically. The plate-like portions 46 are formed with cam grooves 47 and 48 which are interlocking drive mechanisms in which the cam pins 84 and 85 of the two diaphragm plates 56 and 57 are engaged.

The cam grooves 47 and 48 are formed obliquely in the central direction of the moving frame 35 from the front to the rear, and guide and move the cam pins 84 and 85 in accordance with the forward and backward movement of the moving frame 35.

The moving lens unit 32 according to the present modification is also engaged with the cam grooves 47 and 48 when the moving frame 35 moves forward (in the direction of arrow F in FIG. 30) to the object side by the actuator 10 of the VCM. , 85 are reciprocated in the direction close to each other. As a result, the two diaphragms 56 and 57 move inward in the left-right direction, which is the center side in the direction in which they approach each other, by the cam mechanism.

Therefore, the openings 58 and 59 of the two diaphragms 56 and 57 are moved in the approaching direction, the distance between them narrows, and the distance between the two chief rays having the optical axes O1 and O2 narrows. That is, the openings 58 and 59 of the two diaphragms 56 and 57 move in the direction orthogonal to the optical axes O1 and O2, respectively, and the predetermined separation distance of the light flux centers (O1 and O2) entering is It becomes short.

On the other hand, as shown in FIGS. 31 and 32, the moving lens unit 32 moves the cam groove 47, 48 when the moving frame 35 moves to the rear side (direction of arrow B in FIG. 32) on the image side. The cam pins 84 and 85 engaged with each other are drawn out in directions away from each other. As a result, the two diaphragms 56 and 57 move outward in the left-right direction, which is the direction in which the two separate from each other.

Therefore, the openings 58 and 59 of the two diaphragms 56 and 57 are moved in the direction away from each other, the distance between them is increased, and the distance between chief rays having the optical axes O1 and O2 is increased. That is, when the two diaphragms 56 and 57 move away from each other in the direction orthogonal to the optical axes O1 and O2, respectively, the centers of the apertures 58 and 59 move away from each other and enter the light beam centers (O1 and O2). The predetermined separation distance of O2) becomes long.

Therefore, even such a movable lens unit 32 has the same function and effect as those of the above-described embodiment.

(Fifth modification)
FIG. 33 is a front view showing a moving lens unit in a state in which two diaphragms of the fifth modification are in proximity to each other, and FIG. 34 is a view of the moving lens unit in a state in which two diaphragms of the fifth modification are in proximity to each other. FIG. 35 is a front view showing a moving lens unit in a state in which two diaphragms of the fifth modification are separated, and FIG. 36 is a mobile lens unit in a state in which two diaphragms of the fifth modification are separated Is a top view showing FIG.

As shown in FIGS. 33 and 34, the moving lens unit 32 of this modification is a link mechanism using a mechanism in which two diaphragms 56 and 57 slide as a link mechanism using two link portions 71 and 72, etc. At the same time, the moving frame 35 moves forward (in the direction of the arrow F) on the object side, whereby the openings 58 and 59 of the two diaphragms 56 and 57 move in the direction in which they approach.

As a result, the distance between the two diaphragms 56 and 57 decreases, and the centers of the diaphragms 56 and 57 move close to each other in the direction orthogonal to the optical axes O1 and O2. The distance L1 becomes short (see FIG. 34).

On the other hand, in the moving lens unit 32, as shown in FIGS. 35 and 36, at the time of far point observation, the two diaphragms 56 and 57 are moved by moving the moving frame 35 rearward (in the arrow B direction) on the image side. It becomes the structure which moves to the outward side which is a direction which mutually separates.

As a result, the openings 58 and 59 of the two diaphragms 56 and 57 are separated from each other, and the centers of the openings 58 and 59 move away from each other in the direction orthogonal to the optical axes O1 and O2. The predetermined separation distance L2 of the light flux centers (O1 and O2) which are separated from each other and enters the light becomes long (see FIG. 36).

Here, the objective optical system is set such that when the moving frame 35 moves forward, the near point is in focus and when the moving frame 35 moves backward, the far point is in focus. It is a thing. Even with such a configuration, it is possible to provide the stereoscopic endoscope 1 including the stereoscopic imaging device 30 having the same function and effect as the above-described embodiment.

In addition, although the rigid endoscope is illustrated in the present embodiment, the present invention is not limited to this, and it is a technology which can be applied to a flexible endoscope and an industrial endoscope.

The invention described in the above embodiment is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention at the implementation stage. Furthermore, the above embodiments include inventions of various stages, and various inventions can be extracted by appropriate combinations of a plurality of disclosed configuration requirements.

For example, even if some of the configuration requirements are removed from all the configuration requirements shown in the embodiment, the configuration requirements can be eliminated if the problems described can be solved and the described advantages can be obtained. The configuration can be extracted as the invention.

Claims (7)

1. A moving frame in which two objective optical systems are juxtaposed
   A driving unit configured to drive the moving frame forward and backward in a direction along an optical axis of the two objective optical systems;
   A pair of diaphragm members movably provided on the object side or the imaging side of the moving frame and having an opening;
   An interlocking drive mechanism that interlocks the pair of diaphragm members according to the movement of the moving frame by the drive unit and moves the opening in a direction orthogonal to the optical axes of the two objective optical systems;
   A stereoscopic optical unit comprising:
2. The stereoscopic vision optical unit according to claim 1, wherein the interlocking drive mechanism is a link mechanism.
3. A fixing portion connected to the moving frame and rotatably holding the pair of diaphragm members;
   A first long hole into which a first pin provided in the moving frame is inserted;
   A second elongated hole into which a second pin provided in the pair of diaphragm members is inserted;
   A pair of link members disposed rotatably on the fixed portion, formed with the first elongated hole and the second elongated hole, and driving the pair of diaphragm members in accordance with forward and backward movement of the movable frame When,
   The stereoscopic vision optical unit according to claim 2, comprising:
4. The stereoscopic vision optical unit according to claim 1, wherein the interlocking drive mechanism is a cam mechanism.
5. A fixed portion connected to the moving frame and holding the pair of diaphragm members;
   The cam pin provided in said pair of diaphragm members is engaged, It has a cam groove which slides said pair of diaphragm members according to the advance / retraction movement of said movable frame, It is characterized by the above-mentioned. Stereoscopic optical unit.
6. A stereoscopic optical unit according to claim 1;
   A solid-state imaging device for receiving the light of the stereoscopic optical unit;
   A stereoscopic imaging apparatus comprising:
7. A stereoscopic endoscope comprising the stereoscopic imaging device according to claim 6.

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