JP6133838B2 - Lens barrel, optical equipment and electronic equipment - Google Patents

Description

  The present invention relates to a lens barrel, an optical device, and an electronic device.

  Conventionally, a lens barrel used for a digital still camera, a video camera, or the like has been proposed (for example, see Patent Document 1). In this lens barrel, a part of the plurality of lens holding frames can move in the optical axis direction while holding the lens.

JP 2014-48451 A

  However, in the lens barrel described in Patent Document 1, position adjustment of each lens holding frame in the optical axis direction is possible, but position adjustment in directions other than the optical axis direction (for example, tilt adjustment and shift adjustment) is possible. Have difficulty. In particular, fine adjustment of the position of the holding frame other than the lens holding frame closest to the subject side (for example, fine adjustment in the tilt direction and shift direction) with all the lens holding frames attached to the lens barrel body ) Could not be done. Thus, for example, when the lens holding frame is displaced in a direction other than the optical axis direction at the stage of assembling the lens barrel, an operation of disassembling the lens barrel and attaching each lens holding frame to the barrel body again occurs. End up. If it does so, there existed a possibility that the efficiency of the assembly operation | work of a lens-barrel might fall.

  The present invention has been made in view of the above-described reasons, and an object thereof is to provide a lens barrel, an optical apparatus, and an electronic apparatus that can improve the efficiency of assembly work.

In order to achieve the above object, a lens barrel according to the present invention includes:
A first lens;
A second lens;
A first lens frame for holding the first lens;
A second lens frame for holding the second lens;
A lens barrel having a first opening to which the first lens frame is attached, and in which the first lens frame and the second lens frame are attached in order from the outside toward the inside along the cylinder axis direction. The body,
The second lens frame is guided so as to move along the tube axis direction, and one end thereof is supported on the inner side of the lens barrel body, and is provided on an outer peripheral portion of the first opening of the lens barrel body. A main guide shaft inserted through the second opening;
A connection plate disposed on the outer periphery of the first opening of the lens barrel body and connected to the other end of the main guide shaft,
The connection plate is movable with respect to the lens barrel body.

  According to the present invention, the connecting plate is movable with respect to the lens barrel body. As a result, the second lens frame can be moved via the main guide shaft by moving the connecting plate, so that the second lens and the second lens frame are attached to the lens barrel main body, The relative positional relationship between one lens and the second lens can be adjusted. Therefore, in assembling the lens barrel, the optical axis adjustment can be performed without disassembling the lens barrel even when the optical axis shift of the second lens is found after attaching the first lens frame holding the first lens. This makes it possible to improve the efficiency of assembly work.

1 is a perspective view of a lens barrel according to an embodiment. It is the sectional view on the AA line of FIG. 1 about the lens-barrel which concerns on embodiment. It is a perspective view which shows some 1st lens-barrel main bodies, 2nd lens-barrel main bodies, and a 2nd lens frame which concern on embodiment. It is a perspective view of the 2nd lens which concerns on embodiment, a 2nd lens frame, and a connection plate. It is a perspective view of the connection plate which concerns on embodiment. It is operation | movement explanatory drawing of the lens-barrel which concerns on embodiment. It is operation | movement explanatory drawing of the lens-barrel which concerns on embodiment. It is operation | movement explanatory drawing of the lens-barrel which concerns on embodiment. 6 is a schematic plan view of an optical apparatus according to Embodiment 2. FIG. It is a perspective view of the lens barrel which concerns on a modification. It is a perspective view of the 2nd lens which concerns on a modification, a 2nd lens frame, and a connection plate. It is operation | movement explanatory drawing of the lens-barrel which concerns on a modification.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
The lens barrel 1 according to the present embodiment has an appearance as shown in FIG.
As shown in FIG. 2, the lens barrel 1 includes a first barrel main body 6 and a second barrel main body 7, and a bottomed cylindrical tubular body 8 disposed inside the first barrel main body 6. And an outer shell body 9 disposed so as to cover the outer side of the first barrel main body 6. The lens barrel 1 includes a first lens 11, a second lens 12, a third lens 13, a first lens frame 21, a second lens frame 22, and a third lens frame 23. The lens barrel 1 forms an image of light incident on the first lens 11 from the subject on an imaging element (not shown) disposed on the opposite side of the lens barrel 1 from the first lens 11 side. Further, the lens barrel 1 includes a main guide shaft 31 and a sub guide shaft 32 disposed inside the first lens barrel body 6 and the second lens barrel body 7 and a lead screw for moving the second lens frame 22. (Not shown) and a drive unit (not shown) for driving the lead screw. The cylinder axes of the first lens barrel body 6, the second lens barrel body 7, and the cylindrical body 8 are set so as to coincide with the optical axis AX. The sub guide shaft 32 is disposed at a position facing the main guide shaft 31 across the optical axis AX.

In the following description, “rear” means the image sensor side (downward in FIG. 2) in the direction along the optical axis AX shown in FIG. 2, and “front” means the optical axis AX shown in FIG. In the following description, the object side (upper side in FIG. 2) is meant.
The lens barrel body 5 has a substantially bottomed cylindrical shape, and includes a first lens barrel body 6 that holds the third lens frame 23 inside, and a second lens frame that holds the first lens frame 21 and the second lens frame 22 inside. The lens barrel body 7 is configured.

  The first lens barrel body 6 is formed in a substantially cylindrical shape, and a cylindrical body 8 that holds the third lens frame 23 is disposed on the inner side, and an outer shell body 9 is disposed on the outer side. The first lens barrel body 6 is made of, for example, a non-light transmissive resin material. An elongated slit 61 extending along the optical axis AX is provided on the side wall of the first lens barrel body 6. A second barrel body 7 is attached to the front end portion of the first barrel body 6. A step portion 62 that abuts against the cylindrical body 8 and restricts the rearward movement of the cylindrical body 8 is provided on a part of the side wall of the first barrel main body 6 on the rear side of the central portion in the optical axis AX direction. Is provided. A drive unit is arranged inside the first barrel body 6. The first lens barrel body 6 is provided with a first support portion (not shown) that supports the main guide shaft 31.

  The drive unit is configured, for example, by combining a motor (for example, a stepping motor) that provides a driving force for rotating the lead screw about an axis along its longitudinal direction and a gear train (not shown). The

  The second lens barrel body 7 has a substantially bottomed cylindrical shape, and has an opening (first opening) 79 a having a substantially circular shape in plan view at the bottom 79. A first lens frame 21 and a second lens frame 22 are attached to the second lens barrel body 7 in order from the outside toward the inside along the tube axis direction. Specifically, the first lens frame 21 is attached to a position PosA that covers the opening 79a, and the second lens frame 22 is attached to a position PosB inside the opening 79a in the cylinder axis (optical axis AX) direction. It has been. The first lens barrel body 6 is made of, for example, a non-light transmissive resin material.

  The second lens barrel body 7 has a plurality of extending pieces 71 extending rearward. Each extending piece 71 is provided with an insertion hole (not shown) through which a part of the attachment member 101 is inserted. The attachment member 101 is composed of, for example, a bolt and a nut. The second lens barrel main body 7 is attached to the first lens barrel main body 6 by the mounting member 101 partially inserted through the insertion hole provided in the extending piece 71 and the slit 61 of the first lens barrel main body 6. Yes. The lead screw is disposed so as to extend from the inside of the first lens barrel body 6 to the inside of the second lens barrel body 7 along the optical axis AX. The lead screw is connected to a drive motor disposed inside the first barrel body 6.

  Further, as shown in FIG. 3, the first recess 75 into which a part of the first lens frame 21 is fitted and the connection plate 41 are arranged on the outer periphery of the opening 79 a of the bottom 79. A recess 76 is provided. Each first recess 75 is provided with a screw hole 77 for screwing the first lens frame 21 to the bottom 79 of the second barrel main body 7. A screw hole 78 is formed in the second recess 76 when the connecting plate 41 is screwed to the bottom 79 of the second barrel main body 7 with a tap screw 42 described later. Further, an opening (second opening) 79 b through which the main guide shaft 31 is inserted is provided in the second recess 76. A second support portion (not shown) that supports one end portion of the sub guide shaft 32 is provided inside the second lens barrel body 7. Further, a hole for fixing the other end portion of the sub guide shaft 32 at a position facing the opening 79b across the optical axis AX in the outer peripheral portion of the opening 79a in the bottom 79 of the second barrel main body 7. 73 is penetrated.

  Returning to FIG. 2, the cylindrical body 8 is formed in a substantially bottomed cylindrical shape, and a frame holding portion 81 in which an opening 81 b for holding the third lens frame 23 is formed in a substantially central portion of the bottom portion 81 a; An attachment portion 82 that is formed in a substantially cylindrical shape and is attached to the first lens barrel main body 6 in a state in which the rear end thereof is in contact with the stepped portion 62 of the first lens barrel main body 6. The attachment portion 82 is located behind the frame holding portion 81 and is formed integrally with the frame holding portion 81. An insertion hole (not shown) for inserting the lead screw from the rear to the front is provided at a position corresponding to the lead screw in the frame holding portion 81. The cylindrical body 8 is formed from, for example, a non-light transmissive resin material.

  The outer shell body 9 is formed in a substantially cylindrical shape. A cam groove 91 for positioning the entire lens barrel 1 with respect to the camera in a state where the lens barrel 1 is attached to a camera body (not shown) is provided on the side wall of the outer shell body 9. The outer shell body 9 is made of, for example, a resin material.

  The first lens 11 is disposed at the foremost position in the lens barrel 1, that is, the front position PosA that covers the opening 79a. The first lens 11 is a lens mainly for setting an angle of view. The first lens 11 is composed of a spherical lens formed of, for example, a glass having translucency. The first lens 11 is configured by a convex lens having a convex front surface, for example.

  The second lens 12 and the third lens 13 are arranged at the inner position PosB and the inner position PosC on the inner side in the optical axis AX direction with respect to the opening 79a in the barrel body 5. Specifically, the second lens 12 is disposed inside the second lens barrel body 7, and the third lens 13 is disposed inside the first lens barrel body 6. The second lens 12 and the third lens 13 are lenses for adjusting the resolution of the captured image. As the horizontal positions of the second lens 12 and the third lens 13 change, the resolution of the captured image changes. The 2nd lens 12 and the 3rd lens 13 are comprised by the spherical lens formed, for example from the glass which has translucency. Further, the second lens 12 is configured by a convex lens having a convex front surface, for example, and the third lens 13 is configured by a concave lens having a concave rear surface, for example.

  The first lens frame 21 holds the first lens 11. The first lens frame 21 includes a frame main body 211 having a substantially cylindrical shape, a lens holding portion 212 that holds the first lens 11, and fixing for fixing the first lens frame 21 to the second barrel main body 7. A piece 213 (see FIG. 1). The frame main body 211, the lens holding portion 212, and the fixing piece 213 are integrally formed of, for example, a resin material or aluminum die casting.

  As shown in FIG. 2, the lens holding portion 212 is formed over the entire circumference of the frame main body 211, is orthogonal to the cylinder axis direction of the first lens frame 21 from the rear end portion of the frame main body 211, and is the first lens frame. It protrudes in the direction toward the cylinder axis 21. The first lens 11 is fixed to the front side of the lens holding part 212 with an adhesive. As shown in FIG. 1, the fixing pieces 213 are provided at substantially equal intervals in the circumferential direction from the frame body 211 to the frame body 211. Each of the fixed pieces 213 has insertion holes (not shown) through which the screws 51 are inserted. The recess 75 provided in the bottom 79 of the second barrel main body 7 is provided at a position corresponding to each of the three fixed pieces 213. Further, the screw hole 77 formed in the recess 75 is provided at a position corresponding to the insertion hole provided in the fixing piece 213 in a state where the three fixing pieces 213 are respectively fitted in the recess 75. Yes.

  The second lens frame 22 holds the second lens 12. The second lens frame 22 can be moved along the optical axis AX along the main guide shaft 31 and the sub guide shaft 32. Thereby, it is possible to perform focus adjustment and realize a zoom function. As shown in FIG. 4, the second lens frame 22 includes a plate-shaped frame body 221 having a circular opening 221 a in plan view, a lens holding portion 222 that holds the second lens 12, and the second lens frame 22. A main guide portion 223 and a sub guide portion 224 for guiding along the main guide shaft 31 and the sub guide shaft 32 are provided. The frame body 221, the lens holding part 222, the main guide part 223, and the sub guide part 224 are integrally formed of, for example, a resin material or aluminum die casting. Here, when the material of the first lens 11 and the material of the first lens frame 21 are significantly different from each other to some extent, an elastic adhesive may be employed as the adhesive. Since the elastic adhesive can absorb expansion and contraction of the first lens 11 due to heat or the like, deformation of the first lens 11 can be suppressed.

  The frame body 221 is supported by the main guide shaft 31 and the sub guide shaft 32 through the main guide portion 223 and the sub guide portion 224. The lens holding part 222 is formed over the entire outer periphery of the opening 221a and protrudes from the rear surface side of the frame body 221 toward the center of the opening 221a. The second lens 12 is fixed to the front side of the lens holding part 222 with an adhesive. The main guide part 223 has an insertion hole 223d that extends rearward from a part of the peripheral edge on the side opposite to the opening 221a side of the frame body 221 and into which the main guide shaft 31 is inserted. The sub guide part 224 is provided at a position facing the main guide part 223 and the center of the opening part 221a in the peripheral part of the frame body 221 opposite to the opening part 221a side. The sub-guide portion 224 includes two leg pieces 224a and 224b that extend from the peripheral edge of the frame main body 221 in a direction orthogonal to the thickness direction of the frame main body 221 and away from the opening 221a. The two leg pieces 224a and 224b are arranged so as to sandwich the sub guide shaft 32 from the side. A nut holding portion 225 that holds a nut (not shown) that is screwed to the lead screw is provided in a part other than the main guide portion 223 and the sub guide portion 224 in the peripheral portion of the frame body 221.

  The second lens frame 22 is movable in the front-rear direction with the main guide shaft 31 inserted through the insertion hole 223d of the main guide portion 223 and the sub guide portion 224 holding the sub guide shaft 32 therebetween. . When the drive unit drives the lead screw, the second lens frame 22 is guided by the main guide shaft 31 and the sub guide shaft 32 and moves in the front-rear direction.

  The third lens frame 23 holds the third lens 13. As shown in FIG. 2, the third lens frame 23 includes a substantially cylindrical frame main body 231 and a fixing piece 233 for fixing the third lens frame 23 to the cylindrical body 8. The frame main body 231, the lens holding portion 232, and the fixed piece 233 are integrally formed of, for example, a resin material or aluminum die casting.

  The frame main body 231 is fixed in a state where the frame body 231 is fitted into the opening 81 b of the cylindrical body 8 and the front surface of the fixing piece 233 is in contact with the bottom 81 a of the cylindrical body 8. The lens holding portion 232 is formed over the entire circumference of the frame main body 231, and projects in a direction perpendicular to the cylinder axis direction of the frame main body 231 and toward the cylinder axis of the frame main body 231 from the rear end portion of the frame main body 231. . The peripheral portion of the third lens 13 is fixed to the front side of the lens holding portion 232 with an adhesive. The fixing piece 233 has an insertion hole (not shown) for inserting a screw (not shown). On the other hand, screw holes (not shown) are formed at positions corresponding to the three fixing pieces 233 on the front surface of the bottom 81 a of the frame holding portion 81 of the cylindrical body 8.

  Both the main guide shaft 31 and the sub guide shaft 32 are elongated rod-shaped members. The main guide shaft 31 guides the second lens frame 22 so as to move along the tube axis direction of the second barrel main body 7. One end of the main guide shaft 31 is supported by a first support portion (not shown) inside the first lens barrel body 6, and an opening provided in the outer peripheral portion of the opening 79 a of the second lens barrel body 7. 79b is inserted. One end portion of the main guide shaft 31 is fixed to the first support portion, and the other end portion is connected to the connection plate 41. Here, the first support portion supports the other end portion of the main guide shaft 31 so as to be movable in a direction orthogonal to the optical axis AX.

  The sub guide shaft 32 also guides the second lens frame 22 so as to move along the tube axis direction of the second lens barrel body 7. The sub guide shaft 32 is disposed inside the second lens barrel body 7 at a position facing the main guide shaft 31 across the tube axis in a direction perpendicular to the tube axis of the second lens barrel body 7. One end of the sub guide shaft 32 in the longitudinal direction is fixed to the second support portion inside the second barrel main body 7. The other end of the sub guide shaft 32 is fixed to a hole 73 penetrating the outer periphery of the opening 79 a in the bottom 79 of the second barrel body 7. The second support portion is fixed to the first lens barrel body 6. The sub guide shaft 32 is fixed to the barrel main body 5 (the first barrel main body 6 and the second barrel main body 7) by the hole 73 and the second support portion.

  As shown in FIG. 1, the connecting plate 41 has an elongated plate body 411 that is curved along the outer periphery of the first lens 11. The connection plate 41 is made of, for example, a resin material or metal. As shown in FIG. 5, the connecting plate 41 penetrates through the plate body 411, a boss 412 projecting substantially at the center in the longitudinal direction of the plate body 411, and both ends in the longitudinal direction of the plate body 411. Through-holes 413. The plate main body 411 is provided with a chuck portion 414 formed of a through hole between each through hole 413 and the boss 412 for chucking by an alignment jig (not shown). A rib 415 that protrudes on the side opposite to the side from which the boss 412 protrudes protrudes from a portion of the plate body 411 where the boss 412 protrudes. The boss 412 and the rib 415 are provided with through holes 412 a penetrating from the tip of the boss 412 to the tip of the rib 415.

  As shown in FIG. 4, the connection plate 41 is used in a state where the main guide shaft 31 is inserted through the through hole 412a. As shown in FIG. 1, the connecting plate 41 is attached to the recess 76 of the second barrel main body 7 by the two tap screws 42.

  The tap screw 42 includes a shaft part 421 and a head part 422. The outer diameter of the shaft portion 421 is smaller than the inner diameter of the through hole 413 of the connecting plate 41, and the outer diameter of the head portion 422 is larger than the inner diameter of the through hole 413. When the tap screw 42 is tightened, a screw hole 78 (see FIG. 3) is formed in the recess 76 of the second barrel main body 7. The connecting plate 41 is fixed to the second barrel main body 7 with the outer peripheral portion of the through hole 413 being sandwiched between the front surface of the recess 76 of the second barrel main body 7 and the rear surface of the head 422. Is done. On the other hand, when the tap screw 42 is loosened, the connecting plate 41 can move within the recess 76 of the second barrel body 7.

<Assembly method of lens barrel>
Next, a method for assembling the lens barrel 1 according to the present embodiment will be described with reference to FIG.

  First, the third lens frame 23 holding the third lens 13 is attached to the cylindrical body 8. Specifically, after fixing the third lens 13 to the third lens frame 23, the three fixing pieces 233 of the third lens frame 23 are placed on the bottom of the cylindrical body 8. At this time, the third lens frame 23 is disposed so that the insertion holes provided in the respective fixing pieces 233 are aligned with the positions of the screw holes formed in the bottom of the cylindrical body 8. Then, the third lens frame 23 is fixed to the cylindrical body 8 by screwing the screws inserted into the insertion holes of the respective fixing pieces 233 into the screw holes.

  Next, the cylindrical body 8 to which the third lens frame 23 is attached is attached to the second lens barrel body 7. Specifically, the cylindrical body 8 is inserted from the front of the first barrel main body 6, and the attachment portion 82 of the cylindrical body 8 is attached to the slit 61 of the first barrel main body 6.

  Subsequently, the first cylindrical body 6 to which the sub guide shaft 32 is attached is fixed in front of the second barrel body 7. Specifically, the extension piece 71 of the second lens barrel body 7 is inserted from the front of the first lens barrel body 6, and the extension piece 71 is fixed to the first lens barrel body 6 by the mounting member 101.

  Thereafter, the second lens frame 22 is attached to the second lens barrel body 7. Specifically, the main guide shaft 31 is inserted into the main guide portion 223 from the front of the main guide portion 223 with the sub guide shaft 32 sandwiched by the sub guide portion 224 of the second lens frame 22.

  Next, the second lens 12 is fixed to the second lens frame 22. Here, an adhesive is applied to the front surface of the lens holding portion 222 of the second lens frame 22, and the second lens 12 is placed thereon. Then, using the aligning device, the position of the second lens 12 is finely adjusted so that the optical axis of the second lens 12 coincides with the optical axis of the third lens 13 before the adhesive of the lens holding part 222 is dried. To do. Then, wait until the adhesive is solidified. At this time, the connection plate 41 is temporarily screwed to the second barrel main body 7 by the tap screw 42.

  Subsequently, the first lens frame 21 is attached to the second lens barrel body 7. Specifically, in the state where the three fixing pieces 213 of the first lens frame 21 are respectively fitted in the depressions 75, the screws 51 inserted in the insertion holes of the respective fixation pieces 213 are provided in the depressions 75. The first lens frame 21 is fixed to the barrel main body 6 by being screwed into the hole 77.

  Thereafter, the first lens 11 is fixed to the first lens frame 21. Here, an adhesive is applied to the front surface of the lens holding portion 222 of the first lens frame 21, and the first lens 11 is placed thereon. Then, using the alignment device, the position of the first lens 11 is finely adjusted so that the optical axis of the first lens 12 coincides with the optical axis of the third lens 13 before the adhesive of the lens holding part 222 is dried. To do. Then, wait until the adhesive is solidified.

  Finally, the optical axis of each of the first lens 11, the second lens 12 and the third lens 13 coincides with each other within a preset tolerance range while the drive unit drives the second lens frame 22 in the front-rear direction. Inspect whether or not Here, when the optical axis of the second lens 12 deviates beyond the allowable range with respect to the optical axes of the first lens 12 and the third lens 13, a connecting plate is used using an alignment jig (not shown). By moving 41, the position is finely adjusted in the direction orthogonal to the optical axis AX direction of the second lens 12. Details of the position adjustment method of the second lens 12 will be described later. When the position adjustment of the second lens 12 is completed, the tap screw 42 is rotated after the tip of the shaft portion 421 of the tap screw 42 is brought into contact with the bottom 79 from the through hole 413 of the connecting plate 41. Then, the tap screw 42 bites into the bottom 79 while forming the screw hole 78 in the bottom 79. As a result, the connecting plate 41 is fixed to the second barrel main body 7.

<Method for adjusting the position of the second lens>
Next, a method for adjusting the position of the second lens 12 will be described. Here, a method for finely adjusting (aligning) the position of the second lens 12 in a direction orthogonal to the optical axis AX will be described.

  First, after loosening the tap screw 42, the chuck portion 414 of the connecting plate 41 is gripped by an alignment jig. When the connecting plate 41 is moved along the longitudinal direction of the opening 79b having a rectangular shape in plan view, the main guide shaft 31 and the rib 415 are moved along the longitudinal direction of the opening 79b.

  Here, as shown in FIG. 7, one end portion of the main guide shaft 31 is fixed to the first support portion 65. Accordingly, when the connecting plate 41 is moved as shown in FIG. 6, the main guide shaft 31 is moved so as to pivot about the support portion 65 as shown in FIG. 7 (see the arrow in FIG. 7). . In other words, the main guide shaft 31 changes the inclination with respect to the optical axis AX.

  The sub guide shaft 32 is fixed to the second barrel main body 7, and the sub guide portion 224 of the second lens frame 22 is attached to the sub guide shaft 32. Therefore, as shown in FIG. 6, as the other end of the main guide shaft 31 moves along the longitudinal direction of the opening 79 b, the second lens 12 and the second lens frame 22 move the sub guide shaft 32. It moves so as to rotate around the center (see the arrow in FIG. 6). Further, the thickness direction of the second lens frame 22 coincides with the direction along the main guide shaft 31. Accordingly, as the inclination of the main guide shaft 31 with respect to the optical axis AX changes, the inclination of the second lens frame 22 with respect to the optical axis AX also changes. That is, by moving the connecting plate 41 along the longitudinal direction of the opening 79b, the position of the second lens frame 22 in the direction orthogonal to the optical axis AX and the inclination of the second lens frame 22 with respect to the optical axis AX Changes in tandem. Note that the connecting plate 41 has a state in which the main guide shaft 31 and the rib 415 are positioned at the center of the opening 79b (see the alternate long and short dash line in FIG. 6) to a state where the rib 415 contacts the short side of the opening 79b. Can be moved.

  Further, when the connecting plate 41 is moved along the short direction of the opening 79b by the alignment jig, the main guide shaft 31 and the rib 415 are moved in the short direction in the opening 79b. Then, as shown in FIG. 8, the 2nd lens 12 and the 2nd lens frame 22 move toward the transversal direction of the opening part 79b (refer the arrow in FIG. 8). Here, in the connection plate 41, the state where the main guide shaft 31 and the rib 415 are located at the center of the opening 79b (see the one-dot chain line in FIG. 8), the rib 415 is in contact with the long side of the opening 79b. Can be moved to.

  Thus, in the present embodiment, the movable width of the connecting plate 41 is limited by the size of the opening 79b and the outer diameter of the rib 415 of the connecting plate 41. Therefore, in the present embodiment, it is preferable to set the size of the opening 79b or the outer diameter of the rib 415 based on the assembly error of the second lens 12.

  As described above, in the lens barrel 1 according to the present embodiment, the area of the opening 79 b of the second barrel body 7 is larger than the area of the cross section perpendicular to the longitudinal direction of the main guide shaft 31. Thereby, the second lens frame 22 can be moved via the main guide shaft 31 by moving the connecting plate 41. Then, adjustment of the relative positional relationship between the first lens 11 and the second lens 12 with the first lens 11 and the first lens frame 21 attached (including shift adjustment and tilt adjustment, for example). Can do. Therefore, in the assembly of the lens barrel 1, the light can be obtained without disassembling the lens barrel 1 even when the optical axis shift of the second lens 12 is found after the lens frame 21 holding the first lens 11 is attached. The axis can be adjusted, and the efficiency of assembly work can be improved.

  Further, according to the lens barrel 1 according to the present embodiment, the first lens 11 and the second lens 12 are attached to the second barrel body 7, and the third lens 13 is attached to the first barrel body 6. In the worn state, the relative positional relationship among the first lens 11, the second lens 12, and the third lens can be optimized. Therefore, the image accuracy can be improved.

  Furthermore, according to the lens barrel 1 according to the present embodiment, the end portion of the main guide shaft 31 can be moved in a direction orthogonal to the optical axis AX, so that the second lens frame 22 is interposed via the main guide shaft 31. Can be moved in a direction perpendicular to the optical axis AX. Therefore, after the first lens frame 21 holding the first lens 11 is attached, the position of the second lens 12 can be adjusted in a direction orthogonal to the optical axis AX.

  In the lens barrel 1 according to the present embodiment, the area of the second opening is made larger than the area of the cross section perpendicular to the longitudinal direction of the main guide shaft, so that the first lens 11 and the first With the one lens frame 21 attached, the relative positional relationship between the first lens 11 and the second lens 12 can be adjusted (for example, including shift adjustment and tilt adjustment).

  In the lens barrel 1 according to the present embodiment, the sub guide shaft 32 is disposed in the barrel main body 5 at a position facing the main guide shaft 31 across the tube axis in a direction orthogonal to the tube axis. Yes. Thus, by moving the main guide shaft 31, the position of the second lens frame 22 can be moved in the direction of rotation about the sub guide shaft 32.

  The lens barrel 1 according to the present embodiment includes a first lens 11, a second lens 12, a third lens 13, a first lens frame 21, a second lens frame 22, and a third lens frame 23. Then, the main guide shaft 31 guides the second lens frame 22 so as to move along the cylinder axis direction. Thereby, the position adjustment in the direction orthogonal to the optical axis AX of the second lens 12 sandwiched between the two lenses 11 and 13 in the optical axis AX direction can be performed.

  In the present embodiment, the inner diameter of the through hole 413 through which the shaft portion 421 of the tap screw 42 is inserted is larger than the outer diameter of the shaft portion 421 of the tap screw 42 and larger than the outer diameter of the head portion 422 of the tap screw 42. small. As a result, the connecting plate 41 can be moved in a state where the tip of the tap screw 42 is screwed to the bottom 79 of the second barrel main body 7. Therefore, once the tap screw 42 is tightened and the connecting plate 41 is fixed to the second barrel main body 7, even when the second lens 12 is displaced, the tap screw 42 is loosened and the connecting plate 41 is moved to move the first plate 12. There is an advantage that the displacement of the two lenses 12 can be corrected relatively easily.

  In the present embodiment, the connecting plate 41 is fixed to the second barrel main body 7 using the tap screw 42. Thereby, since it is not necessary to make a screw hole etc. in the 2nd lens barrel main body 7 previously, the simplification of the manufacturing method of the 2nd lens barrel main body 7 can be achieved. In addition, since the movable width of the connection plate 41 is not limited to the position of the screw hole for screwing the connection plate 41, the degree of freedom of adjustment of the second lens frame 22 can be increased.

(Embodiment 2)
As shown in FIG. 9, the optical apparatus according to the present embodiment or the modification includes the lens barrel 1 described in the first embodiment and the digital camera 3000 to which the lens barrel 1 is attached. The digital camera 3000 includes an image sensor 3001 and an attachment portion 3002 to which the lens barrel 1 is attached. The lens barrel 1 is attached to the digital camera 3000 so that the optical axis AX passes through the substantially central portion of the image sensor 3001.

  As mentioned above, although each embodiment of this invention was described, this invention is not limited to the structure of each above-mentioned embodiment.

[Modification]
In the first embodiment, the example in which the connection plate 41 is connected only to the main guide shaft 31 has been described. For example, the sub guide shaft is also connected to the connection plate disposed on the outer peripheral surface of the second barrel main body 7. It may be a configuration.

  For example, as shown in FIG. 10, in the lens barrel 1001 according to this modification, the connection plate 1041 is disposed on the bottom 1079 of the second barrel main body 1007 constituting a part of the barrel main body 1005. Specifically, the connecting plate 1041 is disposed on the outer peripheral portion of the opening 79 a in the bottom portion 1079. In FIG. 10, the same reference numerals as those in FIG. The 3rd hollow part 1076 in which the connection plate 1041 is arrange | positioned is provided in the outer peripheral part of the opening part 79a of the bottom part 1079 in the position facing the 2nd hollow part 76 in which the connection plate 41 is arrange | positioned. The third recess 1076 is provided with a screw hole (not shown) when the connecting plate 1041 is screwed to the second barrel main body 1007 by the tap screw 42. Further, the third recess 1076 is provided with an opening 1079b through which the sub guide shaft 1032 is inserted. The opening 1079b has substantially the same shape as the opening 79b through which the main guide shaft 31 is inserted. The first lens frame 1021 is fixed to the second lens barrel main body 1007 via, for example, two fixing pieces 1213.

  The sub guide shaft 1032 is coupled to the coupling plate 1041 as shown in FIG. The second lens frame 1022 has a sub guide portion 1224 that extends rearward from a part of the peripheral edge on the side opposite to the opening 221 a side of the frame main body 221. The sub guide portion 1224 is provided with an insertion hole 1224d through which a sub guide shaft 1032 is inserted. In FIG. 11, the same reference numerals as those in FIG.

  Further, the main guide shaft 31 and the sub guide shaft 1032 according to this modification are supported by a common support portion 1051 as shown in FIG. The support portion 1051 is pivotally supported by a pair of bearing portions (not shown) arranged to face each other in one direction orthogonal to the tube axis of the first lens barrel body 6, and the tube axis (optical axis) of the first lens barrel body 6. It can be rotated around a rotation axis J1 extending in a direction orthogonal to AX). Thereby, by adjusting the connecting plates 41 and 1041 in parallel, the tilt adjustment (tilt adjustment) of the second lens 12 and the second lens frame 1022 with respect to the optical axis AX can be performed.

  Further, the support portion 1051 uses the bearing portion arranged on the main guide shaft 31 side as the center axis of the bearing portion arranged on the sub guide shaft 1032 side of the pair of bearing portions as the tube axis of the first lens barrel body 6. It can be swung in an orthogonal direction (a direction orthogonal to the optical axis AX) (see the dashed line in FIG. 12). For example, of the two connection plates 41 and 1041, only the connection plate 41 may be moved in a state where only the connection plate 1041 is fixed to the second barrel main body 7 with the screw 1042. Thereby, the positions of the second lens frame 1022 and the second lens 12 can be adjusted in a direction orthogonal to the optical axis AX.

  According to this configuration, since the direction in which the second lens frame 1022 is tilted can be changed, the degree of freedom in adjustment is widened, and the alignment accuracy can be improved.

  In the lens barrel 1 according to Embodiment 1, the example in which the number of lenses used is three has been described, but the number of lenses is not limited to three, and may be two. It may be 4 or more.

  In the first embodiment, the example in which the coupling plates 41 and 1041 are screwed to the bottom portions 79 and 1079 of the second barrel main bodies 7 and 1007 by the tap screws 42 has been described. However, the second barrel of the coupling plates 41 and 1041 is described. The attachment method to the main bodies 7 and 1007 is not limited to this. For example, a screw hole is formed in the second lens barrel body in advance, and the through holes 413 of the connecting plates 41 and 1041 are aligned with the positions of the screw holes and screwed into the screw holes to be fixed. Also good. Alternatively, a method of fixing the connecting plates 41 and 1041 to the second barrel main body 7 and 1007 with an adhesive may be used.

  In the first embodiment, an example in which the chuck portion 414 includes a through hole has been described. However, the chuck portion 414 is not limited to the through hole as long as the chuck portion 414 can be chucked using an alignment jig. For example, the chuck part 414 may be constituted by a hollow part or a protrusion part.

  In the first embodiment, the configuration in which the second lens barrel main body to which the first lens frame 21 is attached has a bottomed cylindrical shape, but the shape of the second lens barrel main body is not limited to this. For example, the second barrel main body may have a cylindrical shape with no bottom. In this case, the second barrel main body has an inner collar portion (not shown) extending in the direction perpendicular to the cylindrical axis direction and extending in the direction toward the cylindrical axis on the inner side in the cylindrical axis direction than the front end portion. The configuration may be provided. Here, the portion surrounded by the end of the inner collar portion on the cylinder axis side is an opening for attaching the first lens frame 21. And it can be set as the structure by which the opening part (not shown) in which the main guide shaft 31 is penetrated was provided in a part of inner collar part.

  In the first embodiment, an example in which the first lens 11, the second lens 12, and the third lens 13 are fixed to the first lens frame 21, the second lens frame 22, and the third lens frame 23 with an adhesive, respectively, will be described. did. However, the method for fixing the lens to the lens frame is not limited to this. For example, the lens may be fixed to the lens frame by heat caulking. In this case, as the material of the lens frames 21, 22, 23, a resin material suitable for heat caulking is preferable. Specific examples include polycarbonate (PC: Poly Carbonate), polymethyl methacrylate (PMMA), polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylonitrile / butadiene / styrene (ABS), polyamide resin (PA), and the like. Heat caulking is preferably used when the difference in linear expansion coefficient between the material forming the lenses 11, 12, and 13 and the material forming the lens frames 21, 22, and 23 is relatively small.

  The first lens 11, the second lens 12, and the third lens 13 may be any of a spherical lens, a Fresnel lens, and an aspheric lens. In the case of a spherical lens or a Fresnel lens, since the lens is easily processed and assembled and adjusted, changes in the optical performance of the lens barrel due to errors in the processing and assembly and adjustment can be suppressed. Aspherical lenses are aspherical lenses formed by grinding, glass-molded aspherical lenses formed by pouring glass into the mold, and composite non-spherical lenses provided with aspherical resin on the surface of the glass lens. Any of spherical lenses may be used. Alternatively, it may be a gradient index lens (GRIN lens) or the like.

  In the first embodiment, an example in which the lenses 11, 12, and 13 are formed of glass has been described. However, the material of the lenses 11, 12, and 13 is not limited to glass. The materials of the lenses 11, 12, and 13 are translucent materials other than glass as long as the physical performance and durability such as refractive index, Abbe number, partial dispersion ratio and linear expansion coefficient are appropriate. Also good.

  In the lens barrel according to the first embodiment, various processes can be performed on the surface of the lens body as necessary. As an example of this processing, the surface portion may be hydrophilized with a photocatalyst or the like in order to prevent the lens body from fogging or water droplet formation. For example, for parts that may be exposed to the outside when used in camera modules, optical equipment, electronic equipment, etc., processing to make the lens body hydrophilic with a photocatalyst etc. to prevent fogging and water droplet formation Etc.

  The shape of the first lens frame 21, the second lens frame 22, and the third lens frame 23 according to Embodiment 1 is not particularly limited as long as it does not rotate due to external impact or the like.

  In the first embodiment, the example in which the lens barrel 1 includes the lenses 11, 12, and 13, the lens frames 21, 22, and 23 is described. However, the members included in the lens barrel 1 are described in the first embodiment. It is not limited to members. For example, a light shielding member for suppressing a ghost image generated in an image photographed by an image sensor, an optical member for absorbing aberrations of the lenses 11, 12, and 13, a waterproof member for waterproofing, an IR cut filter, Other members may be provided.

  In the second embodiment, an example of an optical device in which the lens barrel 1 is attached to the digital camera 3000 has been described. However, the device in which the lens barrel 1 is used is not limited to the optical device. For example, the lens barrel 1 may be attached to a device other than a digital camera (for example, a mobile phone) to constitute an electronic device having a zoom shooting function.

1: lens barrel, 5, 1005: lens barrel body, 6: first lens barrel body, 7, 1007: second lens barrel body, 8: cylindrical body, 9: outer shell body, 11: first lens, 12: Second lens, 13: Third lens, 21, 1021: First lens frame, 22, 1022: Second lens frame, 23: Third lens frame, 31: Main guide shaft, 32, 1032: Sub guide shaft 41, 1041: connecting plate, 42, 1042, 51: screw, 73, 223d: insertion hole, 74: stepped portion, 75, 76: recessed portion, 77, 78: screw hole, 79a, 79b, 81b, 221a: Opening part, 81: frame holding part, 81a: bottom part, 82, 3002: mounting part, 91: cam groove, 101: mounting member, 211, 221, 231: frame main body, 212, 222, 232: lens holding part, 213 , 233: fixed piece, 223: main guide part, 2 4a, 224b: Leg piece, 224: Sub guide part, 411: Plate body, 412: Boss, 412a, 413: Through hole, 414: Chuck part, 415: Rib, 421: Shaft part, 422: Head part, 3000: Digital camera, 3001: Image sensor

Claims (7)

A first lens;
A second lens;
A first lens frame for holding the first lens;
A second lens frame for holding the second lens;
A lens barrel having a first opening to which the first lens frame is attached, and in which the first lens frame and the second lens frame are attached in order from the outside toward the inside along the cylinder axis direction. The body,
The second lens frame is guided so as to move along the tube axis direction, and one end thereof is supported on the inner side of the lens barrel body, and is provided on an outer peripheral portion of the first opening of the lens barrel body. A main guide shaft inserted through the second opening;
A connecting plate disposed on the outer periphery of the first opening of the lens barrel body and connected to the other end of the main guide shaft ;
A plurality of screws for fixing the connecting plate to the barrel main body ,
The area of the second opening is larger than the area of the cross section perpendicular to the longitudinal direction of the main guide shaft,
The length of the second direction perpendicular to the first direction from the first opening to the tube axis of the second opening and the width of the first direction are longer than the outer diameter of the main guide shaft,
The second lens frame, Ri position adjustable der by moving the coupling plate relative to the lens barrel body,
The connecting plate has a plurality of through holes through which the screws are inserted,
The inner diameters of the plurality of through holes are larger than the outer diameter of the shaft portion of the screw and smaller than the outer diameter of the head portion of the screw,
The width in an arbitrary direction orthogonal to the central axis of each of the plurality of through holes is larger than the diameter of the shaft portion of the screw.
Lens barrel. The second lens frame is guided to move along the cylinder axis direction, and is opposed to the main guide axis in the direction perpendicular to the cylinder axis with respect to the main guide axis inside the barrel main body. A secondary guide shaft disposed at a position where
The sub guide shaft is fixed to the barrel main body.
The lens barrel according to claim 1. A third lens located on the opposite side of the first lens with respect to the second lens;
A third lens frame for holding the third lens;
The lens barrel according to claim 1 or 2. The screw is a tap screw.
The lens barrel according to any one of claims 1 to 3 . A first lens;
A second lens;
A first lens frame for holding the first lens;
A second lens frame for holding the second lens;
A lens barrel having a first opening to which the first lens frame is attached, and in which the first lens frame and the second lens frame are attached in order from the outside toward the inside along the cylinder axis direction. The body,
The second lens frame is guided so as to move along the tube axis direction, and one end thereof is supported on the inner side of the lens barrel body, and is provided on an outer peripheral portion of the first opening of the lens barrel body. A main guide shaft inserted through the second opening;
The second lens frame is guided to move along the tube axis direction, and the tube axis in the direction perpendicular to the tube axis of the tube body relative to the main guide shaft inside the tube body A sub-guide that is disposed at a position facing each other with one end thereof supported on the inner side of the barrel main body and inserted into a third opening provided in an outer peripheral portion of the first opening of the barrel main body The axis,
A first connection plate disposed on an outer periphery of the first opening of the lens barrel body and connected to the other end of the main guide shaft;
A second connecting plate disposed on the outer periphery of the first opening of the lens barrel body and connected to the other end of the sub guide shaft ;
A plurality of first screws for fixing the first connecting plate to the lens barrel body;
A plurality of second screws for fixing the second connecting plate to the barrel main body ,
The area of the second opening is larger than the area of the cross section perpendicular to the longitudinal direction of the main guide shaft,
The length of the second direction perpendicular to the first direction from the first opening to the tube axis of the second opening and the width of the first direction are longer than the outer diameter of the main guide shaft,
The area of the third opening is larger than the area of the cross section perpendicular to the longitudinal direction of the sub guide shaft,
The length of the fourth direction orthogonal to the third direction from the first opening to the tube axis of the third opening and the width of the third direction are longer than the outer diameter of the sub guide shaft,
The second lens frame, Ri position adjustable der by moving at least one of the first connecting plate and said second connecting plate with respect to the lens barrel body,
The first connection plate has a plurality of first through holes through which the first screws are inserted,
An inner diameter of the plurality of first through holes is larger than an outer diameter of a shaft portion of the first screw and smaller than an outer diameter of a head portion of the first screw,
The width in an arbitrary direction orthogonal to the central axis of each of the plurality of first through holes is larger than the diameter of the shaft portion of the first screw,
The second connection plate has a plurality of second through holes through which the second screws are inserted,
An inner diameter of the plurality of second through holes is larger than an outer diameter of a shaft portion of the second screw and smaller than an outer diameter of a head portion of the second screw,
A width in an arbitrary direction orthogonal to a central axis of each of the plurality of second through holes is larger than a diameter of a shaft portion of the second screw;
Lens barrel. To any one of claims 1 to 5 including a lens barrel according, optical instruments. To any one of claims 1 to 5 including a lens barrel according, electronic equipment.