JP2024018039A - Lens barrel and aligning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel that can be disassembled easily and can reutilize a base member and a lens holding member, and can reliably fix the lens holding member after adjustment for moving the lens holding member in parallel within a plane orthogonal to a light axis.

SOLUTION: In a lens barrel having a lens holding member for holding a lens, a base member fixed to the lens holding member by a fixing member, and an adjustment member for adjusting relative positions of the lens holding member and the base member, the lens holding member has a fixing hole, the fixing member has an eccentricity fixation shaft fixed to the fixing hole, an elastic member having a through hole into which the eccentricity fixation shaft is inserted, and an eccentricity fixation collar that has a through hole into which the eccentricity fixation shaft is inserted and is fitted to the base member, the elastic member is clamped by the lens holding member and the eccentricity fixation collar, and the lens holding member and the base member are fixed by filling an adhesive in an adhesion portion formed from the eccentricity fixation shaft, the elastic member, and the eccentricity fixation collar.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a lens barrel and an alignment method. In particular, it relates to a method of fixing a lens after adjusting it by moving it in parallel within a plane orthogonal to the optical axis.

BACKGROUND ART Conventionally, in lens barrels used in digital still cameras and the like, alignment work has been performed during the manufacturing process in order to suppress deterioration of optical performance.

The alignment work is performed by attaching the lens barrel to an alignment jig and adjusting the position of the lens holding member held by the base member while inspecting resolution performance. At this time, it is necessary to fix the base member and the lens holding member at a relative position that satisfies the required performance.

In particular, a lens barrel whose lens holding member is heavy may easily shift from its adjusted relative position due to impact or movement. Therefore, in a lens barrel in which the lens holding member has a large weight, it is necessary to particularly securely fix the lens holding member.

Patent Document 1 discloses an eccentricity adjustment structure that increases the fixing precision of a lens after eccentricity adjustment and also enables disassembly and reassembly of lens components when performing eccentricity adjustment again.

Further, Patent Document 2 discloses a lens barrel that is easy to disassemble, allows the base member and the lens chamber to be reused, and has a structure that can be applied to an alignment mechanism in the direction in which the lens chamber is tilted. ing.

Patent No. 6780243 Patent No. 6753611

However, in the eccentric adjustment mechanism of Patent Document 1, adhesive is injected directly into the pin fixing hole, so the adhesive may not be completely peeled off into the pin fixing hole during disassembly and adjustment, resulting in dust remaining or poor workability. There is a problem that it is bad. Furthermore, there is a risk that adhesive may flow into the gap between the lens frame and the base tube, making disassembly difficult.

In the lens barrel of Patent Document 2, it is not a problem when adjusting the tilting direction of the lens barrel, but when adjusting to move the lens barrel in parallel in a plane perpendicular to the optical axis, the lens barrel in the eccentric fixed collar is not a problem. The gap between the inner circumference side surface and the flange portion of the eccentric fixed shaft changes depending on the amount of adjustment. Therefore, the adhesive flows in from the gap, which is undesirable. In order to eliminate the gap, it may be possible to add a step of pushing the eccentric fixing collar from the outer diameter side of the lens barrel after adjustment, but since the eccentric fixing collar is fitted into the lens holding member, If you push it in with too much force, it may become out of adjustment. Also, although there is a disclosure regarding adjustment in which the lens is moved in parallel in a plane orthogonal to the optical axis, this is a configuration that can be applied when the mounting direction is the same as the optical axis, and the lens is placed in the direction in which the tool is working. It is difficult to adapt the current configuration.

The present invention has been made in view of the above problems, and it is easy to disassemble, the base member and the lens holding member can be reused, and the lens holding member can be moved in parallel within a plane perpendicular to the optical axis. To provide a lens barrel that can be reliably fixed after adjustment.

The lens barrel of the present invention includes a lens holding member that holds a lens, a base member that is fixed to the lens holding member by a fixing member, and an adjustment member that adjusts the relative position of the lens holding member and the base member. The lens barrel has a fixing hole, the fixing member has an eccentric fixing shaft fixed to the fixing hole, and an elastic member having a through hole through which the eccentric fixing shaft is inserted. and an eccentric fixing collar that has a through hole through which the eccentric fixing shaft is inserted and is fitted to the base member, and the elastic member is sandwiched between the lens holding member and the eccentric fixing collar. It is characterized in that the lens holding member and the base member are fixed by filling an adhesive into an adhesive portion formed by the core fixing shaft, the elastic member, and the eccentric fixing collar.

Further, the alignment method of the present invention includes a lens holding member having a fixing hole and holding a lens, a base member having an arrangement hole and fixed to the lens holding member by a fixing member, and a lens holding member that is rotated to hold the lens. The fixing member includes an eccentric roller that adjusts the position of the member and the base member, and the fixing member includes an eccentric fixing shaft fixed to the fixing hole, and an elastic member having a through hole into which the eccentric fixing shaft is inserted. and an eccentric fixing collar having a through hole through which an eccentric fixing shaft is inserted, the elastic member being sandwiched between a lens holding member and the eccentric fixing collar. The lens holding member is moved in parallel in a plane orthogonal to the optical axis by fitting the eccentric fixing collar into the arrangement hole and rotating the eccentric roller provided on the outer periphery of the lens holding member. and filling the adhesive part formed by the eccentric fixing shaft, the eccentric fixing collar, and the elastic member so as to fix the lens holding member and the base member in the predetermined position after adjustment. The lens holding member is aligned by the steps of:

According to the lens barrel of the present invention, it is easy to disassemble, the base member and the lens holding member can be reused, and the lens holding member can be fixed after adjustment by moving it parallel to the plane orthogonal to the optical axis. It becomes possible to do this reliably.

A perspective view of a main part of a lens barrel 10 according to an embodiment of the present invention An exploded perspective view of main parts of a lens barrel 10 according to an embodiment of the present invention A perspective view of a shift alignment roller 41 and a tilt alignment roller 42, which are adjustment members according to an embodiment of the present invention. A perspective view of a fixing member 50 according to an embodiment of the present invention Perspective view of eccentric fixed shaft 70 Perspective view of elastic member 80 Perspective view of eccentric fixing collar 90 A sectional view of a fixing member 50 according to an embodiment of the present invention Enlarged view of fixing member placement hole 21 in FIG. 2 A diagram illustrating an eccentric fixed shaft 70 having a flange portion 74 A perspective view of a fixing member 50 including an eccentric fixing shaft 70 having a flange portion 74 A sectional view of a fixing member 50 including an eccentric fixing shaft 70 having a flange portion 74

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the present invention is not limited to this embodiment. Further, in this application, threads are not depicted for the sake of simplicity.

FIG. 1 is a perspective view of a main part of a lens barrel 10 according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a main part of a lens barrel 10 according to an embodiment of the invention. Each configuration of the lens barrel 10 will be described below with reference to FIGS. 1 and 2. Note that the lens barrel 10 can be attached to and replaced with the imaging device, and has an optical axis at its center. Furthermore, in the present invention, the optical axis side of the lens barrel 10 will be referred to as the inner peripheral side of the lens barrel, and the opposite side will be referred to as the outer peripheral side of the lens barrel.

The lens barrel 10 includes a fixed frame 20 that is a base member, a lens holding frame 30 that is a lens holding member, and an adjustment member that adjusts the relative positions of the fixed frame 20 and the lens holding frame 30. It has a certain shift centering roller 41 and tilt centering roller 42, and a fixing member 50 that fixes the fixed frame 20 and the lens holding frame 30.

The fixed frame 20 is a centering lens group holding cylinder in the lens barrel 10. The fixed frame 20 has a plurality of fixed parts 24, which are fixed to the lens barrel 10 with screws. The fixed frame 20 also has a fixing member placement hole 21 into which the eccentric fixing collar 90 of the fixing member 50 fits, a shift alignment roller placement hole 22 into which the shift alignment roller 41 fits, and a tilt alignment roller 42. A tilt alignment roller arrangement hole 23 is provided in which the tilt alignment roller is fitted.

The lens holding frame 30 is a member that holds the lens group 35. Adjustment to move the lens holding frame 30 parallel to the optical axis direction in a plane perpendicular to the optical axis direction (hereinafter referred to as shift adjustment) or adjustment to tilt the lens holding frame 30 relative to the optical axis direction (hereinafter referred to as tilt adjustment) By doing this, the lens barrel 10 is aligned. The lens holding frame 30 also includes a fixing hole 31 into which the fitting portion 71 of the eccentric fixing shaft 70 of the fixing member 50 fits, a screw hole f32, and a screw hole portion into which the shift alignment roller 41 is fixed. s33 and a screw hole t34 for fixing the tilt alignment roller 42.

Next, the shift alignment roller 41 and the tilt alignment roller 42, which are adjustment members, will be explained using FIG. 3. The shift alignment roller 41 and the tilt alignment roller 42 are eccentric cylindrical members, and fit into the shift alignment roller placement hole 22 and the tilt alignment roller placement hole 23 provided in the fixed frame 20, respectively. ing. The shift centering roller 41 and the tilt centering roller 42 are fixed to the screw hole s33 and the screw hole t34 of the lens holding frame 30 with attachment screws 44. The relative positions of the fixed frame 20 and the lens holding frame 30 are shifted and tilted by rotating the shift alignment roller 41 and the tilt alignment roller 42 according to the eccentricity set for each. Furthermore, the shift centering roller 41 and the tilt centering roller 42 are provided with a cutout portion 43 for engaging an instrument when rotating.

Next, the fixing member will be explained using FIGS. 4, 5, 6, 7, and 8. 4 is a perspective view of a fixing member 50 according to an embodiment of the present invention, FIG. 5 is a perspective view of an eccentric fixing shaft 70 included in the fixing member 50, and FIG. 6 is a perspective view of an elastic member 80 included in the fixing member 50. 7 is a perspective view of an eccentric fixing collar 90 included in the fixing member 50, and FIG. 8 is a sectional view of the fixing member 50 according to an embodiment of the present invention.

The fixing member 50 includes an eccentric fixing shaft 70 having a fitting part 71, an elastic member 80, and an eccentric fixing collar 90. The fixed frame 20 and the lens holding frame 30 are fixed by a shift centering roller 41, a tilt centering roller 42, and each mounting screw 44. However, since each alignment roller is configured to be rotatable for adjustment, there is a risk that the positions of the shift alignment roller 41 and the tilt alignment roller 42 may shift when a strong impact is applied, for example. Therefore, by providing the fixing member 50 and fixing the adjusted position at a location other than each alignment roller, the shift alignment roller 41 and the tilt alignment roller 42 are configured to avoid positional deviation. Furthermore, by providing a plurality of fixing parts, the load on each part is dispersed, and damage to each member due to impact becomes less likely to occur. In this embodiment, three sets of the shift centering roller 41, the tilt centering roller 42, and the fixing member 50 are arranged at equal intervals around the outer circumference of the lens barrel 10.

The eccentric fixed shaft 70 is a cylindrical member and has a fitting part 71 and a screw insertion part 72. The elastic member 80 is a donut-shaped member and has a through hole e81. Further, the elastic member 80 is made of a rubber material or a urethane material and has elastic force. The eccentric fixing collar 90 is a donut-shaped member and has a through hole c91. The diameter of the opening of the through hole c91 is different between the inner peripheral side of the lens barrel 10 and the outer peripheral side of the lens barrel 10, and the diameter of the opening of the through hole c91 is different between the inner peripheral side of the lens barrel 10 and the outer peripheral side of the lens barrel 10. It is wider than the peripheral side.

The fitting portion 71 fits into the fixing hole 31 of the lens holding frame 30, and is further screwed into the screw hole f32 with a screw 73, thereby fixing the eccentric fixing shaft 70 and the lens holding frame 30. Further, in the eccentric fixing collar 90, the eccentric fixing shaft 70 is inserted through the through hole c91, and is fitted into the fixing member arrangement hole 21 of the fixing frame 20. The elastic member 80 has the eccentric fixing shaft 70 inserted through the through hole e81, and is sandwiched between the surface of the lens holding frame 30 having the fixing hole 31 and the surface of the eccentric fixing collar 90 on the inner peripheral side of the lens barrel 10. It is arranged like this.

In this embodiment, the eccentric fixing shaft 70 is fixed to the lens holding frame 30 by a fitting part 71 and a screw 73, but the fixing method is not limited to this. For example, it is also possible to have a configuration in which the eccentric fixing shaft 70 has a threaded portion, and to fix it to the lens holding frame 30 by tightening the threaded portion of the eccentric fixing shaft 70 without using a screw.

The above is a description of the members constituting the lens barrel 10 according to the embodiment of the present invention. Next, the assembly procedure, alignment method, and fixing method of the alignment mechanism of the lens barrel 10 described in the embodiment will be explained.

First, a procedure for engaging the fixed frame 20 and the lens holding frame 30 will be explained. First, the shift alignment roller 41 and the tilt alignment roller 42 are fitted into the shift alignment roller placement hole 22 and the tilt alignment roller placement hole 23 of the fixed frame 20, and the screw holes of the lens holding frame 30 are fitted with the mounting screws 44. It is fixed by screwing into the part s33 and the screw hole part t34.

Next, fit the fitting part 71 of the eccentric fixing shaft 70 into the fixing hole 31 of the lens holding frame 30, insert the screw 73 into the screw insertion part 72, and insert the screw into the screw hole f32 of the lens holding frame 30. Fix it by tightening 73. Subsequently, the eccentric fixed shaft 70 is inserted into the through hole e81 of the elastic member 80. Finally, the eccentric fixing shaft 70 is inserted into the through hole c91 of the eccentric fixing collar 90, and the eccentric fixing collar 90 is fitted into the fixing member placement hole 21 of the fixing frame 20.

When fitting the eccentric fixing collar 90 into the fixing member placement hole 21, the insertion amount is appropriately controlled. If the amount of insertion is excessive, there is a possibility that the eccentric fixing collar 90 may obstruct the movement of the lens holding frame 30 during alignment work, which will be described later. On the other hand, if the amount of insertion is insufficient, a gap will be created between the eccentric fixing collar 90 and the elastic member 80, and the adhesive may leak from the gap when fixing the lens holding frame 30 and the fixing frame 20, which will be described later. There is. The insertion amount can be managed, for example, by configuring a collar shape A on the inner diameter side of the fixing frame 20 at the inner diameter of the fixing member placement hole 21 as shown in FIG. There is a method in which the amount of insertion is determined by the shape of the collar when fitted. In addition, means for controlling the amount of insertion may be taken by using a tool for controlling the amount of pushing when the eccentric fixing collar 90 is fitted into the fixing member placement hole 21.

The fixed frame 20 and the lens holding frame 30 are engaged with each other through the above procedure. Next, alignment work is performed on the engaged fixed frame 20 and lens holding frame 30. In the alignment work, the lens barrel 10 is attached to an alignment jig such as an MTF measuring device, and the shift adjustment and tilt adjustment of the lens holding frame 30 are performed while observing the resolution performance. More specifically, the alignment work involves inserting a roller rotation tool into the notch 43 of the shift alignment roller 41 and the tilt alignment roller 42, and rotating the shift alignment roller 41 and the tilt alignment roller 42. It will be held in

Here, a change in the relative position between the fixed frame 20 and the lens holding frame 30 during alignment work will be explained. First, in shift adjustment, when the shift centering roller 41 is rotated, the lens holding frame 30 moves in parallel within a plane perpendicular to the optical axis.

By moving the lens holding frame 30 in parallel within a plane orthogonal to the optical axis, the width of the gap created by the lens holding frame 30 and the eccentric fixing collar 90 fitted to the fixed frame 20 changes. By arranging the elastic member 80 so as to be sandwiched between the lens holding frame 30 and the eccentric fixing collar 90, no gap is created between the lens holding frame 30 and the eccentric fixing collar 90 fitted to the fixing frame 20. It is configured as follows.

Further, the elastic member 80 has a thickness greater than or equal to the width that maximizes the width of the gap created by the lens holding frame 30 and the eccentric fixing collar 90 fitted to the fixing frame 20 during shift adjustment. As a result, even when the width of the gap created by the lens holding frame 30 and the eccentric fixing collar 90 fitted into the fixing frame 20 during shift adjustment is maximum, the elastic member 80 is arranged without a gap. Since the elastic member 80 has elastic force, even when the width of the gap created between the lens holding frame 30 and the eccentric fixing collar 90 fitted to the fixing frame 20 during shift adjustment is minimized, the elastic member 80 remains stable. By deforming, movement of the lens holding frame 30 is not inhibited during adjustment.

In the tilt adjustment, when the tilt alignment roller 42 is rotated, the lens holding frame 30 moves in a tilted manner with respect to the optical axis direction. When the tilt adjustment and shift adjustment are performed, the eccentricity fixing shaft 70 fixed to the lens holding frame 30 moves within the inner diameter part of the eccentricity fixing collar 90. Even when the amount of movement of the lens holding frame 30 in the direction of the optical axis during tilt adjustment and the amount of movement of the lens holding frame 30 in parallel in a plane orthogonal to the optical axis during shift adjustment are simultaneously maximum, The inner diameter of the eccentric fixing collar 90 is set so that the eccentric fixing shaft 70 and the inner peripheral part of the eccentric fixing collar 90 do not come into contact with each other.

After performing the alignment work, the fixing frame 20 and the lens holding frame 30 are fixed by the fixing member 50. As shown in FIGS. 4 and 8, the fixing member 50 has an adhesive part 60. The adhesive portion 60 is a portion formed by the eccentric fixing shaft 70, the eccentric fixing collar 90, and the elastic member 80 and is filled with an adhesive.

Since the eccentric fixing shaft 70 is fixed to the lens holding frame 30 and the eccentric fixing collar 90 is fitted to the fixing frame 20, the fixing frame 20 and the lens can be connected by filling the adhesive part 60 with adhesive. Fixing of the holding frame 30 is completed. This provides a structure in which the fixed frame 20 and lens holding frame 30 can be fixed without directly applying adhesive to the fixed frame 20 and lens holding frame 30.

Preferably, the elastic member 80 is configured to come into contact with the inner circumferential surface of the fixing member arrangement hole 21 and the outer circumferential surface of the eccentric fixed shaft 70, so that the inner circumferential surface of the elastic member 80 and Even when the adhesive tends to flow into the gap formed between the eccentric fixed shaft 70 and the outer peripheral surface, it is possible to ensure that the adhesive does not adhere to the fixed frame 20 and the lens holding frame 30.

The above is a description of the assembly procedure, alignment method, and fixing method of the alignment mechanism of the lens barrel 10 according to this embodiment. Next, a disassembly method for removing the lens holding frame 30 from the fixed frame 20 will be explained.

When removing the lens holding frame 30 from the fixed frame 20, all the mounting screws 44 and screws 73 are removed, and the shift alignment roller 41 and the tilt alignment roller 42 are removed. Here, the fixed frame 20 and the lens holding frame 30 are fixed only by the adhesive portion 60 formed by the eccentric fixing shaft 70, the eccentric fixing collar 90, and the elastic member 80. The eccentric fixing shaft 70 can be removed from the lens holding frame 30 by grasping the screw insertion part 72 of the eccentric fixing shaft 70 with an instrument such as tweezers or pliers and pulling out the fitting part 71 from the fixing hole 31 of the lens holding frame 30. It comes off. At this time, part or all of the eccentric fixing shaft 70, the adhesive, the eccentric fixing collar 90, and the elastic member 80 are removed from the lens holding frame 30 and the fixing frame 20. If some parts remain, remove the remaining parts with instruments such as tweezers or pliers. The dismantling work is performed as described above.

Further, instead of disassembling the lens barrel 10, it is also possible to perform readjustment to correct the relative positional deviation between the fixed frame 20 and the lens holding frame 30. In that case, only the fixing member 50 is removed, replaced with a new fixing member 50, and readjustment is performed. Finally, the adhesive portion 60 may be filled with adhesive and fixed.

Further, the present invention can also have the following configuration.

The eccentric fixed shaft 70 may have a flange portion 74 as shown in FIG. 10. When the eccentricity fixing shaft 70 is configured to have a flange portion 74, the elastic member 80 connects the outer peripheral side surface of the lens barrel 10 of the flange portion 74 with the eccentricity fixing collar 90, as shown in FIGS. 11 and 12. It is arranged so as to be sandwiched between the inner circumference side surfaces of the lens barrel 10. By having the flange portion 74, when the adhesive portion 60 is filled with adhesive, a gap is created between the outer circumference of the eccentric fixed shaft 74 and the inner circumference of the through hole e81 of the elastic member 80. Even in some cases, the structure is such that the adhesive does not travel along the eccentric fixed shaft 70 and adhere to the lens holding frame 30.

Further, in this embodiment, only the main parts of the present invention have been explained. The other parts can be constructed using well-known techniques related to lens barrels as appropriate.

As described above, in the present invention, adhesive is used to fix the fixed frame 20 and lens holding frame 30, but the structure is such that adhesive is not directly applied to the fixed frame 20 and lens holding frame 30. . The adhesive is only applied to the adhesive part 60, and the fixing member 50 having the adhesive part 60 can be easily removed. Therefore, it is easy to disassemble the lens barrel 10, and it is easy to reuse members such as the fixed frame 20 and the lens holding frame 30 when performing repairs or readjustments.

Note that the lens barrel according to the present invention may be modified as appropriate depending on the imaging device to which the present invention is applied. Furthermore, various modifications, changes, and combinations may be made, as necessary, such as changes in the appearance by changing the external dimensions of the device, connection positions between members, etc., but all of these are within the equivalent scope of the present invention.

Lens barrel 10
Fixed frame 20
Fixed member placement hole 21
Shift alignment roller placement hole 22
Tilt alignment roller placement hole 23
Fixed part 24
Brim shape A
Lens holding frame 30
Fixing hole 31
Screw hole part f 32
Screw hole s33
Screw hole part t 34
Lens group 35
Shift alignment roller 41
Tilt alignment roller 42
Notch part 43
Installation screw 44
Fixed member 50
Adhesive part 60
Eccentric fixed shaft 70
Fitting part 71
Screw insertion part 72
Screw 73
Flange part 74
Elastic member 80
Through hole e 81
Eccentric fixed collar 90
Through hole c 91

Claims (7)

a lens holding member that holds the lens;
a base member fixed to the lens holding member by a fixing member;
A lens barrel including an adjustment member that adjusts the relative position of the lens holding member and the base member,
The lens holding member has a fixing hole,
The fixing member has an eccentric fixed shaft fixed to the fixing hole, an elastic member having a through hole through which the eccentric fixed shaft is inserted, and a through hole through which the eccentric fixed shaft is inserted. an eccentric fixing collar fitted to the base member;
The elastic member is sandwiched between the lens holding member and the eccentric fixing collar,
A lens characterized in that the lens holding member and the base member are fixed by filling an adhesive into an adhesive portion formed by the eccentric fixing shaft, the elastic member, and the eccentric fixing collar. lens barrel. 2. The lens barrel according to claim 1, wherein the elastic member is in contact with an inner circumferential surface of the arrangement hole and an outer circumferential surface of the eccentric fixed shaft. 2. The lens barrel according to claim 1, wherein the adjusting member is an eccentric roller, and the position of the lens holding member is adjusted by rotating the eccentric roller. The lens barrel according to claim 1, wherein the adjustment is an adjustment in which the lens barrel is moved in parallel within a plane perpendicular to the optical axis. The eccentric fixed shaft includes a flange portion,
The lens barrel according to claim 1, wherein the elastic member is sandwiched between the flange portion and the eccentric fixing collar. The lens barrel according to claim 1, wherein the elastic member is a rubber material or a urethane material. a lens holding member having a fixing hole and holding a lens;
a base member having an arrangement hole and fixed to the lens holding member by a fixing member;
an eccentric roller that adjusts the position of the lens holding member and the base member by rotating;
The fixing member includes an eccentric fixed shaft fixed to the fixing hole, an elastic member having a through hole through which the eccentric fixed shaft is inserted, and an eccentric member having a through hole through which the eccentric fixed shaft is inserted. It has a core fixing collar,
The elastic member is a method for aligning a lens barrel sandwiched between the lens holding member and the eccentric fixing collar,
fitting the eccentric fixing collar into the arrangement hole;
adjusting the lens holding member to move in parallel within a plane perpendicular to the optical axis by rotating the eccentric roller provided on the outer periphery of the lens holding member;
Filling an adhesive into an adhesive portion formed by the eccentric fixing shaft, the eccentric fixing collar, and the elastic member so as to fix the lens holding member and the base member at a predetermined position after the adjustment. process and
A method for aligning a lens barrel, characterized in that the lens holding member is aligned by:

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