JP7071157B2 - Lens hood and connection structure between lens hood and lens barrel - Google Patents

Description

The present invention relates to a lens hood and a connection structure between the lens hood and a lens barrel.

Conventionally, a lens hood may be attached to the tip of the lens barrel to prevent unnecessary light from entering the optical system. Such a lens hood has a so-called flower shape in which four sides of the edge on the subject side protrude toward the subject side in order to block light from a specific angle. The flower-shaped lens hood cannot block unnecessary light unless it is attached to the lens barrel at a predetermined angle so that the protruding part is located vertically and horizontally, and it also blocks the necessary light. It ends up. Therefore, for example, as described in Patent Document 1, a lens barrel-side fitting portion consisting of one of a convex portion and a concave portion is provided on the outer peripheral surface of the lens barrel, and the convex portion and the convex portion are provided on the inner peripheral side of the lens hood. A connection structure having a bayonet structure in which a hood-side fitting portion composed of the other of the recesses is provided is known. According to the connection structure of the bayonet structure, when the lens barrel side fitting portion and the hood side fitting portion are fitted, a click feeling is generated when the convex portion enters the concave portion. It can be confirmed that it is attached to the lens barrel at an angle position.

Further, as a connection structure between another lens hood and the lens barrel, a hood with a lock button for preventing the hood from coming off is used. Specifically, a flange portion extending in the circumferential direction is provided on the outer surface of the end portion of the lens barrel on the subject side, a groove portion is formed on the inner surface of the end portion on the image formation side of the hood, and the groove portion is inward in the radial direction. In addition to forming a diameter stop portion that protrudes into the groove, a lock button that can protrude is provided in the groove portion. Then, the lens hood is made into a lens mirror by inserting the flange portion into the groove portion, contacting one end of the flange portion in the circumferential direction with the diameter stop portion, and contacting the lock button with the other end of the flange portion in the circumferential direction. Can be connected to a cylinder.

Japanese Unexamined Patent Publication No. 2017-44835

However, when using a hood with a lock button, the lens hood must have some degree of rotational backlash with respect to the lens barrel to ensure that the lock button closes. For this reason, the lens hood sways with respect to the lens barrel during use, causing a collision sound, and the wearing feeling is worse than that of the bayonet structure. In addition, it is also done to reduce the rotation play by adjusting the circumferential distance between the diameter stop and the lock button, but adjustment work is done to actually create the lens hood and check and correct the rotation play. It takes time.

The present invention has been made in view of the above problems, and an object thereof is a lens hood that can eliminate rotation backlash without performing time-consuming adjustment work, and a connection between a lens hood and a lens barrel. To provide the structure.

The lens hood of the present invention is a lens hood attached to a lens barrel having a flange portion extending in the circumferential direction formed on the outer surface of the end portion on the subject side, and is formed on the inner surface of the lens hood and can accommodate the flange portion. It has a groove extending in the circumferential direction and a pair of end restraining mechanisms for restraining both ends in the circumferential direction of the flange portion, and one end restraining mechanism of the pair of end restraining mechanisms holds the flange portion in the other. It is characterized in that it is configured to be urged in the circumferential direction toward the end restraining mechanism of the lens.

Further, the connection structure between the lens hood and the lens barrel of the present invention is a connection structure between the lens hood and the lens barrel for detachably connecting the lens hood to the subject-side end of the lens barrel. The lens barrel has a flange portion extending in the circumferential direction on the outer surface, and the lens hood is formed on the inner surface of the lens hood, and has a groove portion extending in the circumferential direction that can accommodate the flange portion and both ends in the circumferential direction of the flange portion. Each has a pair of end restraint mechanisms for restraining, so that one end restraint mechanism of the pair of end restraint mechanisms urges the flange portion in the circumferential direction toward the other end restraint mechanism. It is characterized by being configured in.

According to the present invention, there is provided a lens hood that can eliminate rotational backlash without performing time-consuming adjustment work, and a connection structure between the lens hood and the lens barrel.

It is a perspective view seen from the subject side of the lens hood used for the attachment / detachment structure of the lens hood and the lens barrel according to one Embodiment of this invention. It is an exploded perspective view seen from the subject side of the lens hood shown in FIG. 1. It is an exploded perspective view seen from the image formation side of the lens hood shown in FIG. FIG. 3 is a cross-sectional perspective view of the lens hood shown in FIG. 1 as viewed from the image forming side. FIG. 4 is an enlarged cross-sectional perspective view of the V portion in FIG. It is sectional drawing seen from the image formation side of the lens hood shown in FIG. It is a perspective view which shows the connection member of the lens barrel used for the attachment / detachment structure of the lens hood and the lens barrel according to one Embodiment of this invention. It is sectional drawing of the connection member of a lens hood and a lens barrel in a state where the lens hood shown in FIG. 1 is attached to the connection member of the lens barrel shown in FIG. 7.

Hereinafter, an embodiment of the lens hood of the present invention and the connection structure between the lens hood and the lens barrel will be described with reference to the drawings.

〔Lens hood〕
FIG. 1 is a perspective view of the lens hood used for the attachment / detachment structure of the lens hood and the lens barrel according to the embodiment of the present invention as viewed from the subject side. FIG. 2 is an exploded perspective view of the lens hood shown in FIG. 1 as viewed from the subject side. FIG. 3 is an exploded perspective view of the lens hood shown in FIG. 1 as viewed from the image forming side. FIG. 4 is a cross-sectional perspective view of the lens hood shown in FIG. 1 as viewed from the image forming side. FIG. 5 is an enlarged cross-sectional perspective view of the V portion in FIG. FIG. 6 is a cross-sectional view taken from the image forming side of the lens hood shown in FIG.

As shown in FIGS. 1 to 3, the lens hood 1 includes a hood body 2, a hood decorative ring 4 attached to the image forming side of the hood body 2, a hood lock button 6, a lock spring 8, and a lock piece 10. , A leaf spring 12 and a fixing screw 14.
A plurality of (five in this embodiment) through holes 2a penetrating in the optical axis direction are formed in the hood main body 2 at intervals in the circumferential direction. Further, in the hood decorative ring 4, a screw hole 4a is formed inside at a position corresponding to the through hole 2a of the hood main body 2. With the hood lock button 6, the lock spring 8, the lock piece 10, and the leaf spring 12 arranged at predetermined positions on the hood body 2, the hood decorative ring 4 is brought into contact with the image forming side of the hood body 2. The lens hood 1 is integrally assembled by inserting the fixing screw 14 through the through hole 2a of the hood body 2 and screwing it into the screw hole 4a of the hood decorative ring 4. The screwing of the fixing screw 14 and the screw hole 4a is not particularly limited. For example, the fixing screw 14 may be screwed into the screw hole 4a in which a thread is formed in advance, or the blind hole is simply formed. The fixing screw 14 may be screwed into the formed screw hole 4a while forming a screw thread with a tap tight screw.

As shown in FIGS. 1 to 6, the hood main body 2 connects the outer cylinder portion 16, the inner cylinder portion 18 arranged inside the outer cylinder portion 16, and the outer cylinder portion 16 and the inner cylinder portion 18. It has a connecting portion 20 and.
The outer cylinder portion 16 has a cylindrical shape as a whole, and has a vertically extending portion 16a located vertically in the mounted state and a left and right extending portions 16b located on the left and right. The vertical extension portion 16a and the left and right extension portions 16b extend toward the subject. In particular, the vertical extending portion 16a extends to the subject side more than the left and right extending portions 16b. A plurality of convex portions extending in the circumferential direction are formed at equal intervals on the inner peripheral surfaces of the vertically extending portion 16a and the left and right extending portions 16b. Further, a notch portion 16c (FIG. 3) is formed at a position on the edge of the outer cylinder portion 16 on the image forming side where the operation portion 6a of the hood lock button 6 is arranged.

The connecting portion 20 is annular when viewed in the optical axis direction, and is inclined inward in the radial direction so as to advance toward the image forming side. The outer edge of the connecting portion 20 is connected to the intermediate portion of the outer cylinder portion 16, and the inner end edge of the connecting portion 20 is connected to the edge of the inner cylinder portion 18 on the subject side. The through hole 2a is formed in the connection portion 20. Further, a storage hole (not shown) for rotatably accommodating the shaft portion 6d is formed at a portion corresponding to the shaft portion 6d of the hood lock button 6 of the connection portion 20.

The inner cylinder portion 18 has a cylindrical shape, and its central axis is arranged so as to coincide with the central axis of the outer cylinder portion 16. Further, a notch portion 18a is formed at a portion corresponding to the lock portion 6b of the hood lock button 6 of the inner cylinder portion 18. Further, an opening 18b is formed in a portion of the inner cylinder portion 18 corresponding to the lock piece 10. A pair of parallel guide portions 17 extending outward in the radial direction are formed on both sides of the opening 18b in the circumferential direction. Further, a pair of columnar protrusions 19 extending from the connecting portion 20 toward the image forming side are formed outside the pair of guide portions 17 in the radial direction.

On the inner surface of the inner cylinder portion 18, a first protrusion 30 extending in the circumferential direction over substantially the entire circumference and being divided into a plurality of portions is formed. Further, a pair of second protrusions 32 are formed on the image forming side of the first protrusion 30 at predetermined intervals in the optical axis direction. The pair of second protrusions 32 extend at positions facing each other with the optical axis interposed therebetween in a range of approximately 90 degrees in the circumferential direction. First and second groove portions 34a and 34b are formed between the first protrusion 30 and the second protrusion 32. At one end of the second groove portion 34b in the circumferential direction, a diameter stop portion 36 (FIGS. 3 and 6) extending from the end portion of the second protrusion 32 to the first protrusion 30 is formed.

The hood decorative ring 4 has an annular inclined surface 22 having a truncated cone shape, and an outer cylinder 24 and an inner cylinder 26 extending from the annular inclined surface 22 toward the subject. A first notch 28 is formed at a position where the operation portion 6a of the hood lock button 6 of the annular inclined surface 22 and the outer cylinder 24 is arranged. Further, a first notch 26a is formed in a portion of the inner cylinder 26 corresponding to the hood lock button 6. Further, second notched portions 24b and 26b are formed at locations corresponding to the lock pieces 10 of the outer cylinder body 24 and the inner cylinder body 26, respectively. A storage hole 22a (FIG. 4) for rotatably accommodating the shaft portion 6d is formed at a portion corresponding to the shaft portion 6d of the hood lock button 6 of the hood decorative ring 4. In the hood decorative ring 4, the outer cylinder 24 is arranged radially inside the outer cylinder portion 16 of the hood body 2, and the inner cylinder 26 is arranged radially outside the inner cylinder portion 18 of the hood body 2. , Fixed to the hood body 2.

The hood lock button 6 has an arcuate arm portion 6c, an operation portion 6a attached to the outside of one end of the arm portion 6c in the radial direction, and a lock attached to the inside of the other end of the arm portion 6c in the radial direction. It has a portion 6b and a shaft portion 6d provided at the center of the arm portion 6c so as to project on both sides in the optical axis direction. In the state where the lens hood 1 is assembled, the shaft portion 6d on the subject side is inserted into the accommodating hole 22a of the hood main body 2, and the shaft portion 6d on the image forming side is accommodated in the accommodating hole 22a of the hood decorative ring 4. .. As a result, the hood lock button 6 can rotate about the shaft portion 6d. Further, in the state where the lens hood 1 is assembled, the operation portion 6a protrudes outward through the notch portion 16c of the hood main body 2 and the first notch portion 28 of the hood decorative ring 4. Further, the lock portion 6b of the hood lock button 6 passes through the notch portion 18a of the hood body 2 and the first notch portion 26a of the hood decorative ring 4, and is radially directed to one end of the first groove portion 34a. It protrudes inward. Further, an inclined surface 6b1 (FIGS. 4 and 6) is formed at a portion of the tip of the lock portion 6b opposite to the first groove portion 34a. The inclined surface 6b1 is inclined inward in the radial direction toward the first groove portion 34a. Further, the contact surface 6b2 (the surface on the first groove 34a side) on the opposite side of the inclined surface 6b1 at the tip of the lock portion 6b extends in the radial direction.

The lock spring 8 has a central portion 8c formed by winding a thin metal wire in a coil shape, and first and second arm portions 8a and 8b extending laterally from the central portion. In the lock spring 8, the shaft portion 6d of the hood lock button 6 is inserted into the central portion 8c, the first arm portion 8a abuts on the radial inner surface side of the operation portion 6a of the hood lock button 6, and the second arm portion 8b Is fixed to the hood body 2. As a result, the hood lock button 6 is urged by the lock spring 8 so that the operation portion 6a is located outward in the radial direction and the lock portion 6b protrudes inward in the radial direction of the lens hood 1. Then, by pressing the operation portion 6a inward in the radial direction against the urging force of the lock spring 8, the lock portion 6b can be retracted outward in the radial direction. As will be described later, the hood lock button 6 and the lock spring 8 function as an end restraining mechanism for restraining one end of the flange 42a.

As shown in FIG. 5, the lock coma 10 includes a base portion 10b having a substantially rectangular cross section and a tip portion 10a having a pair of inclined surfaces 10a1 formed on both sides in the circumferential direction so as to taper toward the tip. , Have. The width of the base portion 10b is larger than the width of the tip portion 10a. A recess 10c extending in the optical axis direction is formed outside the base portion 10b in the radial direction. The lock piece 10 is arranged such that the tip portion 10a inserts the opening 18b and the pair of guide portions 17 abut on both sides of the base portion 10b. As a result, the lock piece 10 can be guided by the guide portion 17 and can move in the radial direction. Further, the edge portions 18c located on both sides of the opening 18b (FIG. 3) of the inner cylinder portion 18 of the hood main body 2 extend toward the lock piece 10 side from the guide portion 17. As a result, when the inner surface of the base 10b in the radial direction comes into contact with the edge 18c of the inner cylinder portion 18 of the hood body 2, the lock piece 10 moves so that the lock piece 10 does not move inward in the radial direction any more. To regulate. In the state where the inner surface of the base portion 10b in the radial direction is in contact with the edge portion 18c of the inner cylinder portion 18 of the hood main body 2, only the portion where the inclined surfaces 10a1 are formed on both sides of the tip portion 10a is the inner cylinder portion 18. It protrudes inward from the inner surface of. The inclined surface 10a1 formed on the tip portion 10a is inclined so as to spread outward in the radial direction toward the outer side in the radial direction of the lens hood 1. The lock piece 10 is arranged at a position opposite to the diameter stop portion 36 formed at the end of the second groove portion 34b of the hood main body 2 with the central axis line interposed therebetween.

The leaf spring 12 is formed on a substantially V-shaped protrusion 12a, an arm portion 12b extending laterally from both sides of the protrusion 12a, and a bending portion bent outward in the radial direction. Has 12c and. The leaf spring 12 is arranged radially outward of the lock piece 10 so that the pair of bent portions 12c engage with the protrusions 19 and the protrusions 12a are located inward in the radial direction. The protruding portion 12a of the leaf spring 12 is located in the recess 10c of the base portion 10b of the lock piece 10. As a result, the lock piece 10 is urged inward in the radial direction so as to protrude from the other end of the first groove portion 34a by the leaf spring 12. As will be described later, the lock piece 10 and the leaf spring 12 function as an end restraining mechanism for restraining one end of the flange 42a.

[Lens barrel]
FIG. 7 is a perspective view showing a connecting member of the lens barrel used for the attachment / detachment structure of the lens hood and the lens barrel according to the embodiment of the present invention.
The lens barrel has a connecting member 40 fixed to the end of the lens barrel on the subject side. As shown in FIG. 7, the connecting member 40 has an annular base 40A connected to a cylinder located on the subject side of the lens barrel and a cylindrical connecting portion 40B extending from the base 40A toward the subject side. Be prepared.

A pair of flanges 42a and 42b protruding outward in the radial direction and extending in the circumferential direction are formed on the outer peripheral surface of the connecting portion 40B. The pair of flanges 42a and 42b are located on opposite sides of the central axis. The circumferential angular width of the pair of flanges 42a and 42b is the circumferential angular width between the base portion 10b side end of the inclined surface 10a1 of the lock piece 10 and the contact surface 6b2 of the lock portion 6b of the hood lock button 6. It is slightly larger than the circumferential angle width between the tip end side end portion of the inclined surface 10a1 of the lock piece 10 and the contact surface 6b2 of the lock portion 6b of the hood lock button 6. Hereinafter, for the sake of explanation, the portion between the adjacent flanges 42a and 42b is referred to as a cutout portion 42A.

[Detachment of lens hood]
Hereinafter, a method of attaching and detaching the lens hood to the lens barrel will be described. FIG. 8 is a cross-sectional view of the lens hood and the connecting member of the lens barrel in a state where the lens hood shown in FIG. 1 is attached to the connecting member of the lens barrel shown in FIG.
First, the lens hood 1 is arranged so that the second protrusion 32 faces the notch 42A of the connecting member 40 of the lens barrel. Then, the lens hood 1 is moved toward the lens barrel until the flanges 42a and 42b of the connecting member 40 of the lens barrel come into contact with the first protrusion 30 of the lens hood 1.

Next, the lens hood 1 is rotated with respect to the lens barrel in the direction of the arrow in FIG. When the lens hood 1 is rotated, the end portion of the flange 42 comes into contact with the inclined surface 6b1 of the lock portion 6b of the hood lock button 6. In this way, when the lens hood 1 is further rotated while the flange 42 is in contact with the inclined surface 6b1 of the lock portion 6b, one flange 42a counteracts the urging force of the lock spring 8 and the one flange 42a makes the lock portion 6b radial. Pushing outward, the pair of flanges 42 enter the first and second groove portions 34a and 34b.

Further, when the lens hood 1 is rotated, the end portion of one of the flanges 42a in the rotation traveling direction comes into contact with the inclined surface 10a1 of the lock top 10. In this way, with the end of one flange 42a in contact with the inclined surface 10a1 of the lock piece 10, the end of the other flange 42b is the diameter stop of the end of the second groove 34b of the lens hood 1. The lens hood 1 is rotated until it comes into contact with the portion 36. As a result, the lock piece 10 regresses outward in the radial direction against the urging force of the leaf spring 12. Then, when the end portion of the other flange 42b comes into contact with the diameter stop portion 36, the user releases the rotational force applied to the lens hood 1.

When the user releases the rotational force applied to the lens hood 1, the lock piece 10 is urged inward in the radial direction by the leaf spring 12, so that one end of one of the flanges 42a is the inclined surface 10a1 of the lock piece 10. Is urged in the circumferential direction toward the hood lock button 6. As a result, the lens hood 1 rotates toward the hood lock button 6 until the other end of one flange 42a abuts on the contact surface 6b2 of the lock portion 6b of the hood lock button 6. Then, both ends of one flange 42 are sandwiched between the contact surface 6b2 of the lock portion 6b and the inclined surface 10a1 of the lock piece 10.

In such a state, the flange 42 is sandwiched between the first protrusion 30 and the second protrusion 30, and the movement of the lens hood 1 with respect to the lens barrel in the optical axis direction is restricted. Further, since both ends of one flange 42 are sandwiched between the lock portion 6b and the lock piece 10, the rotational movement of the lens hood 1 with respect to the lens barrel is restricted.

As described above, according to the present embodiment, since the lock piece 10 is urged inward in the radial direction by the leaf spring 12, one end of the flange 42a is hooded by the inclined surface 10a1 of the lock piece 10. It is urged in the circumferential direction toward the lock button 6. As a result, both ends of one of the flanges 42a in the circumferential direction come into contact with the lock piece 10 and the lock portion 6b of the hood lock button 6, so that the rotation backlash of the lens hood 1 can be eliminated. Further, since the lock piece 10 has a configuration in which one of the flanges 42a is urged in the circumferential direction, it is not necessary to adjust the rotation backlash.

Further, according to the present embodiment, the lock piece 10 has an inclined surface 10a1 such that the lock piece 10 advances in the circumferential direction toward the hood lock button 6 toward the outer side in the radial direction of the lens hood 1, and the lock piece 10 has an inclined surface 10a1. It is urged inward in the radial direction by the leaf spring 12. As a result, one flange 42a can be urged in the circumferential direction with a simple configuration.

In the present embodiment, one end of the flange 42a is restrained by the hood lock button 6, but the present invention is not limited to this. For example, instead of this, a convex portion is formed on one of the lens hood 1 or the connecting member 40, a concave portion is formed on the other side of the lens hood 1 or the connecting member 40, and the convex portion fits into the concave portion. The configuration may be such that the rotation is constrained, and the configuration is not limited.

Further, in the present embodiment, the configuration in which the flange 42a is urged in the circumferential direction by using the lock pieces 10 having the inclined surfaces 10a1 formed on both sides in the circumferential direction has been described as an example, but the lock pieces 10 are limited to this. It suffices as long as it is configured so that the flange 42a can be urged in the circumferential direction. Further, in the present embodiment, the configuration in which the lock piece 10 and the lock portion 6b of the hood lock button 6 are arranged at both ends of the first groove portion 34a has been described as an example, but the present invention is not limited thereto. For example, the lock piece 10 and the lock portion 6b are integrally formed and arranged at one end of the first groove portion 34a, and the flange 42a is urged to the wall portion formed at the other end of the first groove portion 34a. For example, various configurations can be adopted in which the flange 42a accommodated in the first groove portion 34a can be urged and held without causing backlash.

Further, in the present embodiment, the lock piece 10 that can move inward in the radial direction and the leaf spring 12 that urges the lock piece 10 inward in the radial direction urges one end of the flange 42a in the circumferential direction. The configuration is not limited to this, for example, a lock piece that can be moved in the circumferential direction may be provided and the lock piece may be urged in the circumferential direction by a spring or the like, and the configuration is not limited.

1 Lens hood 2 Hood body 2a Through hole 4 Hood decorative ring 4a Screw hole 6 Hood lock button 6a Operation part 6b Lock part 6b1 Inclined surface 6b2 Contact surface 6c Arm part 6d Shaft part 8 Lock spring 8a First arm part 8b Second Arm 8c Central 10 Lock piece 10a Tip 10a 1 Inclined surface 10b Base 10c Recess 12 Leaf spring 12a Protruding 12b Arm 12c Bending 14 Fixing screw 16 Outer cylinder 16a Vertical extension 16b Left and right extension 16c Cutting Notch 17 Guide 18 Inner cylinder 18a Notch 18b Opening 18c Edge 19 Protrusion 20 Connection 20a Accommodating hole 22 Circular inclined surface 22a Accommodating hole 24 Outer cylinder 24b Second notch 26 Inner cylinder 26a Second 1 notch 26b 2nd notch 28 1st notch 30 1st protrusion 32 2nd protrusion 34a 1st groove 34b 2nd groove 36 Diameter stop 40 Connection member 40A Base 40B Connection 42a One flange 42b The other flange 42A Notch

Claims (4)

A lens hood that is attached to a lens barrel having a flange that extends in the circumferential direction on the outer surface of the end on the subject side.
It has a groove portion formed on the inner surface of the lens hood and extending in the circumferential direction capable of accommodating the flange portion, and a pair of end restraining mechanisms for restraining both ends of the flange portion in the circumferential direction.
One of the pair of end restraining mechanisms is configured such that the flange portion is urged in the circumferential direction toward the other end restraining mechanism. Lens hood. The one end restraining mechanism is
A lock piece that can protrude inward in the radial direction from the inner peripheral surface of the lens hood,
It has an urging member that urges the lock top toward the center of the lens hood.
The lens hood according to claim 1, wherein the lock top has an inclined surface that advances outward in the radial direction of the lens hood so as to advance in the circumferential direction toward the side of the other end restraining mechanism. The other end restraining mechanism is
A lock button having an engaging portion that can protrude inward in the radial direction from the inner peripheral surface of the lens hood, and a button portion that can retract the engaging portion in the radial direction.
The lens hood according to claim 1 or 2, further comprising a lock button urging member that urges the engaging portion of the lock button so as to project inward in the radial direction from the inner peripheral surface of the lens hood. It is a connection structure between the lens hood and the lens barrel for detachably connecting the lens hood to the end of the lens barrel on the subject side.
The lens barrel has a flange portion extending in the circumferential direction on the outer surface.
The lens hood has a groove portion formed on the inner surface of the lens hood and extending in the circumferential direction in which the flange portion can be accommodated, and a pair of end restraining mechanisms for restraining both ends of the flange portion in the circumferential direction. ,
A lens characterized in that one end restraint mechanism of the pair of end restraint mechanisms is configured to urge the flange portion in the circumferential direction toward the other end restraint mechanism. Connection structure between the hood and the lens barrel.

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