WO2019181680A1

WO2019181680A1 - Lens barrel

Info

Publication number: WO2019181680A1
Application number: PCT/JP2019/010216
Authority: WO
Inventors: 信之近藤
Original assignee: 富士フイルム株式会社
Priority date: 2018-03-23
Filing date: 2019-03-13
Publication date: 2019-09-26
Also published as: JPWO2019181680A1; JP6975315B2

Abstract

Provided is a lens barrel capable of adjusting the position of an optical element by using a simple configuration. A lens frame (70) holding a second lens G is held by a rear master lens group holding frame (50), via a first pin (80) and a second pin (90) that are held on the circumferential surface thereof. The first pin (80) has a tapered shape, is fitted into a pin fitting hole (100A) provided in the rear master lens group holding frame (50), and is pressed against an edge of the bottom surface of the pin fitting hole (100A). The second pin (90) is fitted into pin fitting holes (100B, 100C) and the outer circumferential surface thereof is pressed against the inner wall surface of the pin fitting holes (100B, 100C). The amount that the first pin (80) is fitted into the pin fitting hole (100A) is adjusted to adjust the position of the lens frame (70).

Description

Tube

The present invention relates to a lens barrel, and more particularly to a lens barrel having a function of adjusting the position of an optical element.

Generally, a lens barrel used for a camera or the like is provided with a mechanism (lens position adjusting mechanism) that adjusts the position of the lens so that eccentricity can be adjusted after assembly. This lens position adjustment mechanism includes a holding unit that holds a lens to be adjusted so as to be movable within a plane orthogonal to the optical axis, and an adjustment unit that moves the lens held by the holding unit with a screw or the like to adjust the position. (For example, Patent Documents 1 and 2).

JP 2017-116729 JP 2011-158632 A

However, the conventional lens position adjusting mechanism has a drawback that the structure of the lens barrel is complicated and large because it requires a holding part and an adjusting part. In addition, the number of parts is large, and there is a disadvantage that the weight is increased and the cost is increased.

The present invention has been made in view of such circumstances, and an object thereof is to provide a lens barrel capable of adjusting the position of an optical element with a simple configuration.

Measures for solving the above problems are as follows.

(1) A first frame that holds the optical element, a second frame that holds the first frame, a plurality of elastically deformable pins provided at a plurality of locations on the outer periphery of the first frame, and a plurality of locations on the second frame And a plurality of holes into which the plurality of pins are fitted, the plurality of pins including at least one first pin and at least one second pin, The pin has a tapered shape whose outer diameter decreases radially outward with respect to the first frame, is fitted into the hole, and the outer peripheral surface is pressed against the edge of the bottom surface of the hole. The pin is fitted into the hole, the outer peripheral surface is pressed against the inner wall surface of the hole, and the position of the first frame relative to the second frame is adjusted by adjusting the fitting amount of the first pin into the hole. A lens barrel that can be used.

According to this aspect, the first frame holding the optical element is held by the second frame via the plurality of elastically deformable pins. The pins are provided at a plurality of locations on the outer periphery of the first frame. The second frame is provided with a plurality of holes into which the pins are fitted. The first frame is held by the second frame when the pins are fitted into holes provided in the second frame.

The plurality of pins provided in the first frame includes at least one first pin and at least one second pin. The first pin has a tapered shape in which the outer diameter is reduced radially outward with respect to the first frame. When the first pin is fitted into the hole, the outer peripheral surface thereof is pressed against the edge of the bottom surface of the hole. On the other hand, when the second pin is fitted into the hole, the outer peripheral surface thereof is pressed against the inner wall surface of the hole. Thereby, a pushing force, that is, a force for shifting the first frame in a direction perpendicular to the optical axis acts on the second frame. As a result, the position of the first frame relative to the second frame can be adjusted by adjusting the fitting amount of the first pin into the hole.

(2) The lens barrel according to (1), wherein the first pin has an arcuate taper shape in which an outer diameter is reduced radially outward with respect to the first frame.

According to this aspect, the first pin has an arcuate taper shape. That is, the outer peripheral cross section has an arc shape. Thereby, it can prevent that a 1st pin fits into a hole so that elastic deformation is impossible (what is called biting can be prevented).

(3) The lens barrel according to (1) or (2) above, wherein the second pin has a shape in which an outer peripheral surface bulges outward in an arc shape.

According to this aspect, the second pin has a shape in which the outer peripheral surface swells in an arc shape toward the outside. Thereby, it can be made to contact | abut on the inner wall face of a hole in the state close | similar to a point or a point, and the load concerning a 2nd pin can be reduced.

(4) With respect to the first pin shaft portion, the first pin shaft portion, the cylindrical first pin outer peripheral portion disposed concentrically with a gap between the first pin shaft portion, and the first pin shaft portion A lens barrel according to any one of (1) to (3), comprising: a first pin support portion that supports an outer peripheral portion of the first pin.

According to this aspect, the first pin has an annular or cylindrical first pin outer peripheral portion disposed concentrically with a gap between the first pin shaft portion and the first pin shaft portion, and the first pin. A first pin support portion that supports the outer peripheral portion of the first pin with respect to the shaft portion. Thereby, only an outer peripheral part can be comprised so that elastic deformation can be carried out to radial direction.

(5) The lens barrel according to (4) above, wherein the first pin is an integrally molded product made of resin and is fixed to the first frame by a fastening member inserted coaxially.

According to this aspect, the first pin is constituted by an integrally molded product made of resin. That is, it is injection-molded with a resin using a predetermined mold and configured as an integrally molded product. Moreover, it fixes to a 1st frame with the fastening member inserted coaxially. Thereby, it can manufacture easily.

(6) The second pin includes an annular or cylindrical second pin outer peripheral portion disposed concentrically with a gap between the second pin shaft portion and the second pin shaft portion, and a second pin shaft portion. A lens barrel according to any one of (1) to (5), further comprising a second pin support portion that supports the outer periphery of the second pin.

According to this aspect, the second pin has an annular or cylindrical second pin outer peripheral portion disposed concentrically with a gap between the second pin shaft portion and the second pin shaft portion, and the second pin. And a second pin support portion that supports the outer peripheral portion of the second pin with respect to the shaft portion. Thereby, only an outer peripheral part can be comprised so that elastic deformation can be carried out to radial direction.

(7) The lens barrel according to (6), wherein the second pin is an integrally molded product made of resin, and is fixed to the first frame by a fastening member that is coaxially inserted.

According to this aspect, the second pin is formed of an integrally molded product made of resin. That is, it is injection-molded with a resin using a predetermined mold and configured as an integrally molded product. Moreover, it fixes to a 1st frame with the fastening member inserted coaxially. Thereby, it can manufacture easily.

(8) The lens barrel according to any one of (1) to (7) above, wherein the bottom surface of the hole into which the first pin is fitted has a chamfered edge.

According to this aspect, the edge of the bottom surface of the hole into which the first pin is fitted is chamfered. Thereby, the outer peripheral surface of a 1st pin can be made to contact | abut to the edge of the bottom face of a hole stably.

(9) Any one of (1) to (8) above, wherein the second pin is disposed on the side where the first frame is shifted and the first pin is disposed on the opposite side with respect to the center of the second frame. Lens barrel.

According to this aspect, the second pin is arranged on the side where the first frame is shifted with respect to the center of the second frame, and the first pin is arranged on the opposite side. That is, the direction in which the first pin is pushed in is aligned with the direction in which the first frame is shifted.

(10) The lens barrel according to (9), wherein a plurality of pins are provided on the outer periphery of the first frame at regular intervals.

According to this aspect, the plurality of pins are provided at regular intervals on the outer periphery of the first frame. In this case, the pins arranged on the side where the first frame is shifted with respect to the center of the second frame are constituted by the second pins, and the rest are constituted by the first pins.

(11) The lens barrel according to (10) above, wherein three pins are provided on the outer periphery of the first frame at regular intervals.

According to this aspect, three pins are provided at regular intervals on the outer periphery of the first frame. In this case, the pins arranged on the side where the first frame is shifted with respect to the center of the second frame are constituted by the second pins, and the rest are constituted by the first pins.

According to the present invention, the position of the optical element can be adjusted with a simple configuration.

Side surface sectional drawing which shows one Embodiment of the lens-barrel to which this invention was applied Side sectional view showing the configuration of the position adjustment mechanism 3-3 sectional view of FIG. The perspective view which shows the structure of a 1st pin Front view showing the configuration of the first pin Plan view showing the configuration of the first pin Bottom view showing the configuration of the first pin 8 is a cross-sectional view taken along line 8-8 in FIG. 9-9 sectional view of FIG. The perspective view which shows the structure of a 2nd pin Front view showing the configuration of the second pin Plan view showing the configuration of the second pin Bottom view showing the configuration of the second pin 14-14 sectional view of FIG. 15-15 sectional view of FIG. Side sectional view of pin fitting hole Side sectional view of pin fitting hole Top view of pin fitting hole The figure which shows the state of the force which a 1st pin receives when a 1st pin is made to fit in a pin fitting hole. The figure which shows the state of the force which a 2nd pin receives when fitting a 2nd pin in a pin fitting hole Side surface sectional view showing another example of the position adjusting mechanism 22-22 sectional view of FIG. The figure which shows another example of a 1st pin The figure which shows another example of a 2nd pin

Hereinafter, preferred embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.

[overall structure]
FIG. 1 is a side sectional view showing an embodiment of a lens barrel to which the present invention is applied.

A lens barrel 1 shown in the figure is a lens barrel configured as an interchangeable lens of a lens interchangeable camera.

The lens barrel 1 includes a fixed barrel 10. The fixed cylinder 10 is configured by connecting a plurality of cylinders including a front fixed cylinder 10A, a central fixed cylinder 10B, and a rear fixed cylinder 10C.

An optical system is arranged inside the fixed cylinder 10. The optical system includes a focus optical system 20, a zoom optical system 22, a diaphragm 24, and a master optical system 26 in order from the object side (left side in FIG. 1) along the optical axis Z.

The focus optical system 20 is an optical system for focus adjustment, and includes a fixed focus lens group 20A and a moving focus lens group 20B. The fixed focus lens group 20A is a fixed lens group, and the moving focus lens group 20B is a moving lens group. By moving the moving focus lens group 20B along the optical axis Z, focusing is performed.

The zoom optical system 22 is an optical system for zooming, and includes a variable magnification lens group 22A and a correction system lens group 22B. Zooming is performed by moving the variable power lens group 22A along the optical axis Z. The correction system lens group 22B moves in conjunction with the variable magnification system lens group 22A, and corrects the fluctuation of the focal position due to zooming.

The diaphragm 24 is composed of an iris diaphragm. The diaphragm 24 expands and contracts its diaphragm blades, changes the aperture amount, and adjusts the amount of light passing therethrough.

The master optical system 26 is an optical system for finally forming an image, and includes a front master lens group 26A and a rear master lens group 26B. The front master lens group 26A is fixed at a fixed position. On the other hand, the rear master lens group 26B is supported movably along the optical axis Z for back focus adjustment and the like.

The fixed cylinder 10 includes a focus driving mechanism for driving the moving focus lens group 20B, a zoom driving mechanism for driving the zoom optical system 22, an aperture driving mechanism for driving the diaphragm 24, and a rear master lens group 26B. A master drive mechanism for driving is provided. Although details of each drive mechanism are omitted, for example, the focus drive mechanism moves the moving focus lens group 20B along the optical axis Z in accordance with the rotation operation of the focus ring 30 provided on the outer periphery of the fixed cylinder 10. Let Further, the zoom drive mechanism uses the zooming system lens group 22A and the correction system lens group 22B constituting the zoom optical system 22 as the optical axis Z in accordance with the rotation operation of the zoom ring 32 provided on the outer periphery of the fixed cylinder 10. Move along. The diaphragm driving mechanism expands and contracts the diaphragm blades according to the rotation operation of the diaphragm ring 34 provided on the outer periphery of the fixed cylinder 10. The master drive mechanism moves the rear master lens group 26B along the optical axis Z in accordance with the rotation operation of the back focus adjustment ring 36 provided on the outer periphery of the fixed cylinder 10.

[Position adjustment mechanism]
<Configuration of position adjustment mechanism>
The lens barrel 1 includes a mechanism for shifting a part of the lenses (second lens G2) of the rear master lens group 26B in a direction orthogonal to the optical axis Z and adjusting the position thereof.

FIG. 2 is a side sectional view showing the configuration of the position adjusting mechanism. 3 is a cross-sectional view taken along the line 3-3 in FIG.

As shown in FIG. 2, the rear master lens group 26B includes three lenses G1, G2, and G3. The three lenses G1, G2, and G3 are configured by a first lens G1, a second lens G2, and a third lens G3 in order from the object side. The first lens G1, the second lens G2, and the third lens G3 are held by the rear master lens group holding frame 50.

The rear master lens group holding frame 50 is held by the movable barrel 40. The movable cylinder 40 has a female screw portion 40A on the inner periphery on the base end side (image side). On the other hand, the rear master lens group holding frame 50 has a male screw portion 50A on the outer periphery of the tip. The rear master lens group holding frame 50 is held by the moving cylinder 40 portion by screwing the outer male screw portion 50A with the inner female screw portion 40A of the moving cylinder 40.

The moving cylinder 40 is supported so as to be movable along the optical axis Z on the inner periphery of the rear fixed cylinder 10C. The master drive mechanism moves the movable cylinder 40 along the optical axis Z in accordance with the rotation operation of the back focus adjustment ring 36. As a result, the rear master lens group 26 </ b> B moves along the optical axis Z.

The first lens G1 and the third lens G3 are fixed to the inner peripheral portion of the rear master lens group holding frame 50 as fixed lenses.

On the other hand, the second lens G2 is held as a movable lens so as to be movable on the inner periphery of the rear master lens group holding frame 50. That is, the second lens G2 is a lens to be adjusted, and is held so that the position in the plane orthogonal to the optical axis Z can be adjusted.

The second lens G2 is an example of an optical element. The position adjusting mechanism 60 adjusts the position of the rear master lens group holding frame 50 by shifting the second lens G2 in a direction orthogonal to the optical axis Z.

The position adjustment mechanism 60 corresponds to the lens frame 70 that holds the second lens G2, the first pin 80 and the second pin 90 provided on the outer periphery of the lens frame 70, and the first pin 80 and the second pin 90. A plurality of pin

fitting holes

100A, 100B, 100C provided in the rear master lens group holding frame 50 are provided.

<Lens frame>
The lens frame 70 holds the second lens G2. The lens frame 70 is an example of a first frame. The second lens G2 is fixed to the inner periphery of the lens frame 70.

The lens frame 70 has

pin mounting portions

72A, 72B, 72C at three locations on the outer periphery thereof. The three

pin mounting portions

72A, 72B, 72C are arranged on the same circumference and are arranged at equal intervals (disposed at 120 ° intervals).

Each

pin attachment portion

72A, 72B, 72C is provided as a circular projection so as to protrude on the outer peripheral surface of the lens frame 70.

Each

pin attaching part

72A, 72B, 72C has the pin fitting part 74, the boss | hub 76, and the screw hole 78 in the front end surface (refer FIG.16 and FIG.17). The pin fitting part 74 is provided in the center of the front end surface of the

pin attachment parts

72A, 72B, 72C as a circular concave part. The pin fitting portion 74 has an inner diameter corresponding to the outer diameter of the shaft portions (first pin shaft portion 80a and second pin shaft portion 90a) of the pins (first pin 80 and second pin 90). The boss 76 is provided on the bottom surface portion of the pin fitting portion 74 as a cylindrical convex portion. The screw hole 78 is provided at the center of the pin fitting portion 74 as a hole into which the screw 110 is screwed.

<First pin>
FIG. 4 is a perspective view showing the configuration of the first pin. FIG. 5 is a front view showing the configuration of the first pin. FIG. 6 is a plan view showing the configuration of the first pin. FIG. 7 is a bottom view showing the configuration of the first pin. 8 is a cross-sectional view taken along the line 8-8 in FIG. 9 is a cross-sectional view taken along line 9-9 of FIG.

The first pin 80 has a tapered shape in which the outer diameter decreases toward the tip (the radially outer end of the lens frame 70 when attached to the lens frame 70). In particular, the first pin 80 of the present embodiment has an arcuate outer cross section and an arcuate taper shape.

The first pin 80 includes a first pin shaft portion 80a, an annular first pin outer peripheral portion 80b disposed concentrically with a gap between the first pin shaft portion 80a, and a first pin shaft portion 80a. And a first pin support portion 80c that supports the first pin outer peripheral portion 80b.

The first pin shaft portion 80a has a hollow cylindrical shape, and has a hollow portion 80f along the shaft. The hollow portion 80f functions as an insertion portion for the screw 110 when the first pin 80 is attached to the

pin attachment portions

72A, 72B, 72C with the screw 110.

The first pin shaft portion 80a has a circular concave portion 80d on the end surface on the tip end side. The concave portion 80d functions as a seat portion of the screw 110 when the first pin 80 is attached to the

pin attachment portions

72A, 72B, 72C with the screw 110. Further, the first pin shaft portion 80a has a positioning hole 80e on an end surface (bottom surface) on the base end portion side (see FIG. 16). The positioning hole 80e is a hole for positioning the first pin 80 with respect to the

pin mounting portions

72A, 72B, 72C, and a boss 76 provided in the

pin mounting portions

72A, 72B, 72C is inserted therein (see FIG. 16). .

In the positioning hole 80e, when the first pin 80 is attached to the

pin attachment portions

72A, 72B, 72C of the lens frame 70, the bosses 76 provided in the

pin attachment portions

72A, 72B, 72C are fitted into the first pin 80. Is positioned with respect to the

pin mounting portions

72A, 72B, 72C (see FIG. 16).

The first pin outer peripheral portion 80b constitutes the main body of the first pin 80. Therefore, the outer shape has an arcuate taper shape whose outer diameter decreases toward the tip. The first pin outer peripheral portion 80b is disposed concentrically with the first pin shaft portion 80a.

The first pin support portion 80c supports the first pin outer peripheral portion 80b at two locations on the inner peripheral portion of the first pin outer peripheral portion 80b.

The first pin 80 is injection-molded with a resin using a predetermined mold and configured as an integrally molded product. For example, POM (POM: Polyoxymethylene or Polyacetal / polyoxymethylene or polyacetal) is injection-molded to form an integrally molded product. The first pin outer peripheral portion 80b is configured to be elastically deformable by using elasticity of resin. The first pin 80 is screwed to the

pin mounting portions

72A, 72B, and 72C by inserting a screw 110 as a fastening member into the hollow portion 80f of the first pin shaft portion 80a. The screw 110 is inserted on the same axis as the first pin 80.

<Second pin>
FIG. 10 is a perspective view showing the configuration of the second pin. FIG. 11 is a front view showing the configuration of the second pin. FIG. 12 is a plan view showing the configuration of the second pin. FIG. 13 is a bottom view showing the configuration of the second pin. 14 is a cross-sectional view taken along line 14-14 of FIG. 15 is a cross-sectional view taken along the line 15-15 in FIG.

The second pin 90 has a shape (so-called barrel shape) in which the outer peripheral surface bulges outward in an arc shape. The second pin 90 includes a second pin shaft portion 90a, an annular second pin outer peripheral portion 90b disposed concentrically with a gap between the second pin shaft portion 90a, and a second pin shaft portion 90a. And a second pin support portion 90c that supports the second pin outer peripheral portion 90b.

The second pin shaft portion 90a has a hollow cylindrical shape and has a hollow portion 90f along the shaft. The hollow portion 90f functions as an insertion portion for the screw 110 when the second pin 90 is attached to the

pin attachment portions

72A, 72B, 72C with the screw 110.

The second pin shaft portion 90a has a circular recess 90d on the end surface (upper surface) on the tip side. The recessed portion 90d functions as a seat portion of the screw 110 when the second pin 90 is attached to the

pin attaching portions

72A, 72B, 72C with the screw 110 (see FIG. 17). Further, the second pin shaft portion 90a has a positioning hole 90e on the end surface (bottom surface) on the base end portion side. The positioning hole 90e is a hole for positioning the second pin 90 with respect to the

pin mounting portions

72A, 72B, 72C, and a boss 76 provided in the

pin mounting portions

72A, 72B, 72C is inserted therein (see FIG. 17). .

The second pin outer peripheral portion 90b constitutes the main body of the second pin 90. Therefore, the outer shape has a shape (so-called barrel shape) in which the outer peripheral surface swells in an arc shape toward the outside. The second pin outer peripheral portion 90b is disposed concentrically with the second pin shaft portion 90a.

The second pin support portion 90c supports the second pin outer peripheral portion 90b at two locations on the inner peripheral portion of the second pin outer peripheral portion 90b.

The second pin 90 is injection-molded with resin using a predetermined mold and configured as an integrally molded product. For example, it is injection molded by POM and configured as an integrally molded product. The second pin outer peripheral portion 90b is configured to be elastically deformable by using elasticity of resin. The second pin 90 is screwed to the

pin mounting portions

72A, 72B, and 72C by inserting a screw 110 as a fastening member into the hollow portion 90f of the second pin shaft portion 90a. The screw 110 is inserted on the same axis as the second pin 90.

<Pin fitting hole>
As shown in FIG. 3, the pin

fitting holes

100A, 100B, 100C are provided at three locations on the peripheral surface of the rear master lens group holding frame 50 corresponding to the three

pin mounting portions

72A, 72B, 72C. . The three

pin fitting holes

100A, 100B, and 100C are arranged on the same circumference and arranged at equal intervals. The rear master lens group holding frame 50 is an example of a second frame. The rear master lens group holding frame 50 is made of a metal such as aluminum, for example.

16 and 17 are side sectional views of the pin fitting holes. 16 shows a cross section when the first pin 80 is fitted into the pin fitting hole 100A, and FIG. 17 shows a case where the second pin 90 is fitted into the pin fitting hole 100A. A cross section is shown. FIG. 18 is a plan view of the pin fitting hole. FIG. 18 shows a plan view when the first pin 80 is fitted into the pin fitting hole 100A.

As shown in FIG. 18, the pin fitting hole 100 </ b> A is configured by a long hole extending in a direction orthogonal to the optical axis Z. That is, the length L in the direction orthogonal to the optical axis Z is configured by a hole longer than the width W in the direction along the optical axis Z.

The pin fitting hole 100A has a width W in the direction along the optical axis Z that is slightly narrower than the outer diameters of the first pin 80 and the second pin 90. For this reason, as shown in FIG. 16, when the first pin 80 is fitted into the pin fitting hole 100A, the first pin 80 is elastically deformed in the radial direction and fitted into the pin fitting hole 100A (collapsed). Deform and fit). As shown in FIG. 17, when the second pin 90 is fitted into the pin fitting hole 100A, the second pin 90 is elastically deformed in the radial direction and fitted into the pin fitting hole 100A (collapse deformation). To fit).

16A and 16B, the pin fitting hole 100A is chamfered at the bottom edge (the inner edge in the radial direction of the lens frame 70) 102 (so-called C chamfering).

The remaining two

pin fitting holes

100B and 100C have the same structure as the pin fitting hole 100A.

<Operation of position adjustment mechanism>
The first pin 80 or the second pin 90 is attached to the three

pin attachment portions

72A, 72B, 72C provided in the lens frame 70. The first pin 80 and the second pin 90 are attached in combination. That is, at least one is attached so as to include the first pin 80 and the second pin 90.

By attaching the first pin 80 and the second pin 90 in combination, the lens frame 70 can be shifted and held in a specific direction with respect to the rear master lens group holding frame 50. This point will be described.

FIG. 19 is a diagram illustrating a state of a force received by the first pin when the first pin is fitted into the pin fitting hole. The figure shows a case where the first pin 80 is fitted into the first pin fitting hole 100A. The same force is also applied when the first pin 80 is fitted into the other pin

fitting holes

100B, 100C.

As shown in the figure, when the first pin 80 is fitted into the pin fitting hole 100A, the outer periphery of the first pin 80 is pressed against the edge 102 of the bottom surface of the pin fitting hole 100A. Thereby, the first pin 80 receives the force F1 from the edge 102 toward the inside in the radial direction. This force F1 acts on the first pin 80 as a radial force F1a and an axial force F1b because the outer shape of the first pin 80 is tapered. The radial force F1a acts as a force F1a that crushes the outer peripheral portion of the first pin 80. On the other hand, the axial force F1b acts as a force F1b that pushes the first pin 80 inward in the radial direction of the lens frame 70. Since the first pin 80 can be elastically deformed, the first pin 80 biases the lens frame 70 radially inward with respect to the rear master lens group holding frame 50 by receiving the axial force F1b.

FIG. 20 is a diagram illustrating a state of a force received by the second pin when the second pin is fitted into the pin fitting hole. The figure shows a case where the second pin 90 is fitted in the first pin fitting hole 100A. A similar force is also received when the second pin 90 is fitted into the other pin

fitting holes

100B, 100C.

As shown in the figure, when the second pin 90 is fitted into the pin fitting hole 100A, the outer periphery of the second pin 90 is pressed against the inner wall surface of the pin fitting hole 100A. At this time, the force F2 received by the second pin 90 is substantially only the radial force. That is, only the force that crushes the outer peripheral portion is obtained.

As described above, the first pin 80 has a function of urging the lens frame 70 inward in the radial direction by being fitted into the pin

fitting holes

100A, 100B, and 100C. Therefore, by attaching the first pin 80 and the second pin 90 in combination, the lens frame 70 can be urged and held in a specific direction. That is, the lens frame 70 is pushed in a specific direction by the first pins 80, and the remaining second pins 90 are elastically deformed to receive the pushing force, so that the lens frame 70 can be stably held in a shifted state. .

The arrangement of the first pin 80 and the second pin 90 is determined according to the direction in which the second lens G2 is shifted. Specifically, the second pin 90 is arranged on the side where the lens frame 70 is shifted with respect to the center of the rear master lens group holding frame 50, and the first pin 80 is arranged on the opposite side. That is, the first pin 80 and the second pin 90 are arranged so that the shifting direction is aligned with the pressing direction with the first pin 80.

Hereinafter, a specific example of the layout of the first pins 80 and the second pins will be described.

Now, let the three

pin mounting portions

72A, 72B, and 72C be the first pin mounting portion 72A, the second pin mounting portion 72B, and the third pin mounting portion 72C, respectively. Further, the pin fitting hole 100A into which the pin attached to the first pin attaching portion 72A is fitted is defined as a first pin fitting hole 100A. The pin fitting hole 100B into which the pin attached to the second pin attaching portion 72B is fitted is defined as a second pin fitting hole 100B. A pin fitting hole 100C into which a pin attached to the third pin attaching portion 72C is fitted is defined as a third pin fitting hole 100C.

Further, as shown in FIG. 3, in the plane orthogonal to the optical axis Z, the position of the optical axis is the origin O, and a straight line passing through the origin O and the center of the first pin fitting hole 100A is the y-axis. A straight line passing through the origin O and orthogonal to the y-axis is taken as the x-axis.

For the y-axis, the direction in which the first pin fitting hole 100A is located is the + (plus) direction. For the x-axis, the direction in which the second pin fitting hole 100B is located is the + (plus) direction.

For the first pin 80 and the second pin 90, the second pin 90 is arranged on the side where the lens frame 70 is shifted with respect to the center (origin O) of the rear master lens group holding frame 50, and the first pin is on the opposite side. The pin 80 is disposed.

For example, when shifting in the negative direction of the y-axis, the second pin 90 is attached to the pin attachment part located on the negative side of the y-axis, and the first pin 80 is attached to the pin attachment part located on the positive side. On the other hand, when shifting in the + direction of the y-axis, the second pin 90 is attached to the pin attachment part located on the + side of the y-axis, and the first pin 80 is attached to the pin attachment part located on the − side. When shifting in the negative direction of the x axis, the second pin 90 is attached to the pin attachment part located on the negative side of the x axis, and the first pin 80 is attached to the pin attachment part located on the negative side. On the other hand, when shifting in the + direction of the x-axis, the second pin 90 is attached to the pin attachment portion located on the + side of the x-axis, and the first pin 80 is attached to the pin attachment portion located on the − side. Specific examples are shown below.

<When shifting in the negative direction of the y-axis>
When shifting in the negative direction of the y-axis, as shown in FIG. 3, the first pin 80 is attached to the first pin attachment portion 72A, and the second pin attachment portion 72B and the third pin attachment portion 72C are second The pin 90 is attached.

To attach the first pin 80 and the second pin 90, first, the first pin shaft portion 80a and the second pin shaft portion 90a are fitted into the pin fitting portion 74, and the boss 76 is provided in the

pin positioning holes

80e and 90e. Fit (see FIGS. 16 and 17). Thereby, the 1st pin 80 and the 2nd pin 90 are positioned by

pin attachment part

72A, 72B, 72C. Next, the screw 110 is passed through the

hollow portions

80f and 90f of the first pin shaft portion 80a and the second pin shaft portion 90a and screwed into the screw holes 78 of the

pin mounting portions

72A, 72B and 72C. Thereby, the 1st pin 80 and the 2nd pin 90 are attached to pin

attachment part

72A, 72B, 72C. The first pin 80 and the second pin 90 attached to the

pin attaching portions

72A, 72B, 72C are the longitudinal directions of the pin

fitting holes

100A, 100B, 100C. It is arranged along the direction (circumferential direction of the rear master lens group holding frame 50).

By attaching the first pin 80 to the first pin attachment portion 72A and attaching the second pin 90 to the second pin attachment portion 72B and the third pin attachment portion 72C, the lens frame 70 is moved in the negative direction of the y-axis. Can be biased and held.

The position is adjusted by adjusting the fitting amount of the first pin 80 with respect to the first pin fitting hole 100A. For example, when shifting in the − direction along the y-axis, the shift amount in the − direction increases as the fitting amount of the first pin 80 decreases. The adjustment of the screwing amount is performed, for example, by adjusting the tightening amount of the screw 110 that fixes the first pin 80 or the pushing amount in the axial direction.

In addition, since the pin

fitting holes

100A, 100B, and 100C are constituted by long holes, the position in the x-axis direction can be adjusted by adjusting the position of the first pin 80 in the hole.

<When shifting in the + direction of the y-axis>
When shifting in the + direction of the y-axis, the first pin 80 is attached to the second pin attachment portion 72B and the third pin attachment portion 72C, and the second pin 90 is attached to the first pin attachment portion 72A. As a result, the lens frame 70 can be urged and held in the + direction with respect to the y axis, and the lens frame 70 can be stably held in the rear master lens group holding frame 50 even after the shift adjustment.

<When shifting in the negative direction of the x-axis>
When shifting in the negative direction of the x axis, the first pin 80 is attached to the second pin attachment portion 72B, and the second pin 90 is attached to the first pin attachment portion 72A and the third pin attachment portion 72C. As a result, the lens frame 70 can be urged and held in the negative direction with respect to the x axis, and the lens frame 70 can be stably held in the rear master lens group holding frame 50 even after shift adjustment.

<When shifting in the + direction of the x axis>
When shifting in the negative direction of the x-axis, the first pin 80 is attached to the first pin attachment portion 72A and the third pin attachment portion 72C, and the second pin 90 is attached to the second pin attachment portion 72B. Thereby, the lens frame 70 can be urged and held in the + direction with respect to the x axis, and the lens frame 70 can be stably held in the rear master lens group holding frame 50 even after the shift adjustment.

FIG. 3 shows the pin arrangement when shifting in the negative direction of the y-axis. In this case, the first pin 80 is attached to the first pin attachment portion 72A, and the second pin 90 is attached to the second pin attachment portion 72B and the third pin attachment portion 72C. Then, the fitting amount of the first pin 80 is adjusted, and the position in the y-axis direction is adjusted.

As described above, according to the lens barrel 1 of the present embodiment, the position of the lens can be adjusted with a configuration of only pins. Thereby, the structure of the lens barrel 1 can be simplified. Moreover, this can reduce the number of parts, and can realize weight reduction and cost reduction.

Usually, the lens whose position can be adjusted is fixed with an adhesive or the like after the adjustment, but in the lens barrel 1 of the present embodiment, the lens frame 70 can be stably held even after the adjustment. Therefore, the fixing step using an adhesive or the like can be omitted. Thereby, an assembly man-hour can be reduced. Also, maintainability can be improved. Furthermore, it is possible to prevent the generation of dust due to adhesion or the like.

[Modification]
<< Modification of layout of first pin and second pin >>
In the above embodiment, the lens frame 70 is held by three pins (first pin and second pin), but the number of pins provided in the lens frame 70 is not limited to this. It is only necessary to have at least two pins. In order to stably hold the lens frame 70, it is preferable to provide three or more pins. That is, it is preferable to provide pins at three or more locations on the lens frame 70 as a plurality of locations.

FIG. 21 is a side sectional view showing another example of the position adjusting mechanism. FIG. 22 is a sectional view taken along the line 22-22 in FIG.

In the position adjustment mechanism 60 of this example,

pin attachment portions

72A, 72B, 72C, 72D are provided at four locations on the peripheral surface of the lens frame 70. The four

pin attachment portions

72A, 72B, 72C, 72D are arranged on the same circumference and at equal intervals (arranged at intervals of 90 °). The configuration of each

pin mounting portion

72A, 72B, 72C, 72D is the same as the configuration of the

pin mounting portions

72A, 72B, 72C of the above embodiment.

The rear master lens group holding frame 50 has pin

fitting holes

100A, 100B, 100C, and 100D at four locations on the peripheral surface corresponding to the four

pin mounting portions

72A, 72B, 72C, and 72D. The four pin

fitting holes

100A, 100B, 100C, and 100D are arranged on the same circumference and arranged at equal intervals. The configuration of each pin

fitting hole

100A, 100B, 100C, 100D is the same as the configuration of the pin

fitting hole

100A, 100B, 100C of the above embodiment.

The type of pin (first pin 80 or second pin 90) attached to each

pin attachment portion

72A, 72B, 72C, 72D is determined according to the direction in which the second lens G2 is shifted.

Now, let the four

pin mounting portions

72A, 72B, 72C, and 72D be the first pin mounting portion 72A, the second pin mounting portion 72B, the third pin mounting portion 72C, and the fourth pin mounting portion 72D, respectively. Further, the pin fitting hole 100A into which the pin attached to the first pin attaching portion 72A is fitted is defined as a first pin fitting hole 100A. The pin fitting hole 100B into which the pin attached to the second pin attaching portion 72B is fitted is defined as a second pin fitting hole 100B. A pin fitting hole 100C into which a pin attached to the third pin attaching portion 72C is fitted is defined as a third pin fitting hole 100C. A pin fitting hole 100D into which a pin attached to the fourth pin attaching portion 72D is fitted is defined as a fourth pin fitting hole 100D.

Further, as shown in FIG. 22, in the plane orthogonal to the optical axis Z, the position of the optical axis is the origin O, and a straight line passing through the origin O and the center of the first pin fitting hole 100A is the y-axis. A straight line passing through the origin O and orthogonal to the y-axis is taken as the x-axis.

For the y-axis, the direction in which the first pin fitting hole 100A is located is the + (plus) direction, and the direction in which the third pin fitting hole 100C is located is the-(minus) direction. For the x-axis, the direction in which the second pin fitting hole 100B is located is the + (plus) direction, and the direction in which the fourth pin fitting hole 100D is located is the-(minus) direction.

The first pin 80 and the second pin 90 are arranged with the second pin 90 in a direction in which the lens frame 70 is shifted with respect to the center (origin O) of the rear master lens group holding frame 50. Then, the first pin 80 is disposed in the opposite direction. Specifically, the arrangement is as follows.

<When shifting in the negative direction of the y-axis>
When shifting in the negative direction of the y-axis, as shown in FIG. 22, the first pin 80 is attached to the first pin attachment portion 72A, and the second pin 90 is attached to the third pin attachment portion 72C.

<When shifting in the + direction of the y-axis>
When shifting in the + direction of the y-axis, the first pin 80 is attached to the third pin attachment portion 72C, and the second pin 90 is attached to the first pin attachment portion 72A.

<When shifting in the negative direction of the x-axis>
When shifting in the negative direction of the x axis, as shown in FIG. 22, the first pin 80 is attached to the second pin attachment portion 72B, and the second pin 90 is attached to the fourth pin attachment portion 72D.

<When shifting in the + direction of the x axis>
When shifting in the + direction of the x-axis, the first pin 80 is attached to the fourth pin attachment portion 72D, and the second pin 90 is attached to the second pin attachment portion 72B.

FIG. 22 shows the arrangement of pins when shifting in the negative direction of the y-axis and in the negative direction of the x-axis. In this case, the first pin 80 is attached to the first pin attachment portion 72A and the second pin attachment portion 72B, and the second pin 90 is attached to the third pin attachment portion 72C and the fourth pin attachment portion 72D. . Then, the fitting amount of the first pin 80 is adjusted, and the positions in the y-axis direction and the x-axis direction are adjusted.

Thus, the pins are laid out so that different types of pins are arranged across the center (origin O) of the rear master lens group holding frame 50.

<< First Pin Modification >>
FIG. 23 is a diagram illustrating another example of the first pin.

The first pin 80 shown in the figure has a frustoconical shape at the outer periphery. That is, the diameter of the outer peripheral portion is linearly reduced toward the tip. Thus, the 1st pin 80 should just have the taper shape which an outer diameter reduces toward a front-end | tip.

In addition, it can prevent that the 1st pin 80 fits into a pin fitting hole so that elastic deformation is impossible by setting it as an arc-shaped taper shape like the said embodiment. That is, the biting of the pin can be prevented.

Further, the shape of the outer peripheral portion of the first pin 80, that is, the shape of the first pin outer peripheral portion 80b, is a shape extending in the axial direction according to the depth of the pin fitting hole to be fitted, that is, a cylindrical shape. It is good.

Moreover, in the said embodiment, the 1st pin axial part 80a is fitted to the pin fitting part 74 with which the front end surface of

pin attachment part

72A, 72B, 72C was equipped, and the 1st pin 80 is

pin attachment part

72A, 72B. However, the structure for attaching the first pin 80 to the

pin attachment portions

72A, 72B, 72C is not limited to this. In addition, for example, a convex portion is provided on the tip surface of the

pin mounting portions

72A, 72B, and 72C, and a concave portion is provided on the bottom surface of the first pin shaft portion 80a, and the convex portions of the

pin mounting portions

72A, 72B, and 72C are A structure may be adopted in which the first pin 80 is attached to the

pin attachment portions

72A, 72B, and 72C by being fitted into the recess of the 1-pin shaft portion 80a.

<< Modification of the second pin >>
The 2nd pin 90 should just be a shape which can be fitted to a pin fitting hole in the state which the outer peripheral surface pressed against the inner wall face of the pin fitting hole. That is, for the second pin 90, a pin having a general shape can be adopted.

FIG. 24 is a diagram illustrating another example of the second pin.

The second pin 90 shown in the figure is a pin having a constant outer diameter. When the second pin 90 of this configuration is fitted into the pin fitting hole, the outer peripheral surface thereof makes line contact with the inner wall surface of the pin fitting hole.

Further, the shape of the outer peripheral portion of the second pin 90, that is, the shape of the second pin outer peripheral portion 90b, is a shape extending in the axial direction according to the depth of the pin fitting hole to be fitted, that is, a cylindrical shape. It is good.

Moreover, in the said embodiment, the 2nd pin axial part 90a is fitted to the pin fitting part 74 with which the front end surface of

pin attachment part

72A, 72B, 72C was equipped, and the 2nd pin 90 is

pin attachment part

72A, 72B. However, the structure for attaching the second pin 90 to the

pin attachment portions

pin mounting portions

72A, 72B, and 72C, and a concave portion is provided on the bottom surface of the second pin shaft portion 90a, and the convex portions of the

pin mounting portions

72A, 72B, and 72C are A structure may be adopted in which the second pin 90 is attached to the

pin attachment portions

72A, 72B, and 72C by being fitted into the recesses of the 2-pin shaft portion 90a.

<Modification of pin fitting hole>
In the said embodiment, although the pin fitting hole is comprised by the elongate hole, you may comprise by a circular hole.

Also, it is not always necessary to chamfer the bottom edge of the pin fitting hole (see FIG. 23). In the case of chamfering, the first pin 80 can be stably fitted into the pin fitting hole.

<Application to other lens barrels>
In the above embodiment, the case where the present invention is applied to the lens barrel of the interchangeable lens of the interchangeable lens camera has been described as an example. However, the application of the present invention is not limited to this. The present invention can be similarly applied to a lens barrel of a lens apparatus incorporated in a so-called lens-integrated camera. Further, the present invention can be applied to a barrel of an optical device other than a camera such as a projector, a microscope, a telescope, and binoculars.

In the above embodiment, the case where the position of the lens is adjusted has been described as an example. However, the object to be adjusted (optical element) is not limited to this, and the positions of other optical elements such as prisms, mirrors, etc. The same can be applied to the case of adjusting.

In addition, when the present invention is applied to a lens barrel, it is preferable that a lens having a large influence on optical performance is a lens to be adjusted.

DESCRIPTION OF SYMBOLS 1 Lens barrel 10 Fixed cylinder 10A Front side fixed cylinder 10B Center fixed cylinder 10C Rear side fixed cylinder 20 Focus optical system 20A Fixed focus lens group 20B Moving focus lens group 22 Zoom optical system 22A Variable magnification system lens group 22B Correction system lens group 24 Diaphragm 26 Master optical system 26A Front master lens group 26B Rear master lens group 30 Focus ring 32 Zoom ring 34 Diaphragm ring 36 Back focus adjustment ring 40 Moving cylinder 40A Female thread part 50 Rear master lens group holding frame 50A Male thread part 60 Position adjustment mechanism 70 Lens frame 72A Pin mounting portion (first pin mounting portion)
72B Pin mounting part (second pin mounting part)
72C Pin mounting part (third pin mounting part)
72D Pin mounting part (fourth pin mounting part)
74 Pin fitting portion 76 Boss 78 Screw hole 80 First pin 80a First pin shaft portion 80b First pin outer peripheral portion 80c First pin support portion 80d Recess

80e Positioning hole

80f Hollow portion 90 Second pin 90a Second pin shaft portion 90b Second pin outer peripheral portion 90c Second pin support portion 90d Recess 90e Positioning hole 90f Hollow portion 100A Pin fitting hole (first pin fitting hole)
100B Pin fitting hole (second pin fitting hole)
100C pin fitting hole (third pin fitting hole)
100D pin fitting hole (fourth pin fitting hole)
102 edge 110 screw F1 force F1a received by the first pin radial force F1b received by the first pin axial force F2 received by the first pin force G1 received by the second pin G1 lens (first lens)
G2 lens (second lens)
G3 lens (third lens)
O Origin Z Optical axis

Claims

A first frame for holding an optical element;
A second frame for holding the first frame;
A plurality of elastically deformable pins provided at a plurality of locations on the outer periphery of the first frame;
A plurality of holes provided in a plurality of locations of the second frame and into which the plurality of pins are fitted;
A lens barrel with
The plurality of pins includes at least one first pin and at least one second pin,
The first pin has a tapered shape in which an outer diameter decreases radially outward with respect to the first frame, is fitted into the hole, and an outer peripheral surface is pressed against an edge of a bottom surface of the hole Abutted,
The second pin is fitted into the hole, and the outer peripheral surface is pressed against the inner wall surface of the hole,
A lens barrel capable of adjusting a position of the first frame with respect to the second frame by adjusting a fitting amount of the first pin into the hole.
The first pin has an arcuate taper shape with an outer diameter decreasing radially outward with respect to the first frame.
The lens barrel according to claim 1.
The second pin has a shape in which an outer peripheral surface swells in an arc shape toward the outside.
The lens barrel according to claim 1 or 2.
The first pin is
A first pin shaft,
An annular or cylindrical first pin outer peripheral portion disposed concentrically with a gap between the first pin shaft portion,
A first pin support portion that supports the first pin outer peripheral portion with respect to the first pin shaft portion;
The lens barrel according to any one of claims 1 to 3, further comprising:
The first pin is an integrally molded product made of resin, and is fixed to the first frame by a fastening member inserted coaxially.
The lens barrel according to claim 4.
The second pin is
A second pin shaft,
An annular or cylindrical second pin outer peripheral portion disposed concentrically with a gap between the second pin shaft portion;
A second pin support portion for supporting the outer peripheral portion of the second pin with respect to the second pin shaft portion;
The lens barrel according to claim 1, comprising:
The second pin is an integrally molded product made of resin, and is fixed to the first frame by a fastening member inserted coaxially.
The lens barrel according to claim 6.
A bottom surface of the hole into which the first pin is fitted has a chamfered edge;
The lens barrel according to any one of claims 1 to 7.
The second pin is disposed on the side of shifting the first frame with respect to the center of the second frame, and the first pin is disposed on the opposite side.
The lens barrel according to any one of claims 1 to 8.
A plurality of the pins are provided at regular intervals on the outer periphery of the first frame.
The lens barrel according to claim 9.
The three pins are provided at regular intervals on the outer periphery of the first frame.
The lens barrel according to claim 10.