JP6484060B2 - Lens hood and lens device including the same - Google Patents

Description

  The present invention relates to a lens hood that is attached to a subject side of a lens device and shields unnecessary incident light on the lens device, and a lens device including the same.

  In order to protect the lens on the forefront when the lens unit is placed, the lens unit of the imaging device, such as a camera or video camera, is generally placed closer to the subject side of the subject side of the lens barrel than the frontmost lens. Protruding. Hereinafter, the lens barrel that protrudes toward the subject side with respect to the frontmost lens is referred to as a lens protection lens barrel.

2. Description of the Related Art Conventionally, a lens hood that shields unnecessary incident light on a lens device is known as an optical accessory attached to such a lens protection barrel.
Some lens hoods can be equipped with an optical filter that adds effects to the captured image. Further, some optical filters, such as polarizing filters and cross filters, can obtain further effects by being rotated.

Patent Document 1 has been proposed as a structure for rotating such an optical filter from the outside of the effective ray of the lens device while being mounted in the lens hood.
The inner diameter of the hood frame, which serves as a reference for attaching the lens hood to the lens device, and the outer diameter of the lens protection lens barrel of the lens device are substantially the same, and the hood frame is first inserted from the front of the lens device. Next, when the rear end of the hood frame comes into contact with the outer flange portion of the lens protection lens barrel, when the hood knob screwed into the hood frame is tightened, the lens protection lens barrel is interposed between the hood frame and the hood knob. Is sandwiched. Thereby, the lens device and the lens hood are fixed integrally. A rotating ring for mounting the optical filter is rotatably fitted to the hood frame, and has a structure that can be rotated from the outside by a rotating operation knob.

  In Patent Document 2, when the hood frame is formed of an elastic material and mounted on the lens apparatus, the hood frame is elastically deformed by moving a movable member (a function equivalent to a lock screw) to a protruding position. Accordingly, a method has been proposed in which a protrusion provided on the inner diameter of the hood frame engages with a groove provided on the lens protection lens barrel, thereby fixing the lens hood to the lens device.

Japanese Patent Laid-Open No. 06-148721 JP 2000-267153 A

  However, when the hood frame of the lens hood having the optical filter rotating structure of Patent Document 1 is formed of the elastic material of Patent Document 2, the hood frame is deformed by the reaction force of the fixing member that abuts against the lens device when the lens hood is fixed. Since the rotating ring is fitted to the hood frame, if the hood frame is deformed, the fitting relationship between the rotating ring and the hood frame deteriorates, the rotating ring malfunctions, or the optical filter is not mounted correctly due to deformation of the rotating ring. May occur. In general, the purpose of manufacturing the hood frame with an elastic member such as a resin is to reduce the cost. Therefore, it is a problem to achieve both maintenance of the operability of the rotating ring and cost reduction.

Therefore, an object of the present invention is to provide a lens hood that is advantageous in terms of , for example, good operability of the rotating ring and low cost.

In order to achieve the above object, the present invention provides a lens hood that can be attached to and detached from a lens device, and includes a first inner diameter portion and a second inner diameter portion, and the first inner diameter portion has a tip of the lens device. There is insertable, and a hood frame which is formed of an elastic material, to urge the portion of the inner peripheral surface of the first inner diameter portion of the hood frame on a part of the outer peripheral surface of the distal end of the lens device a hood fixing means for fixing the hood frame to said front end of said lens device, wherein is inserted into the second inner diameter portion of the hood frame rotatably, a rotary ring that can be mounted an optical filter, the rotary Urging means for urging the ring toward the second inner diameter portion, and the second inner diameter portion is larger than the difference between the outer diameter of the tip of the lens device and the inner diameter of the first inner diameter portion. The difference between the inner diameter of the rotating ring and the outer diameter of the rotating ring is larger. That.

According to the present invention, for example, it is possible to provide a lens hood that is advantageous in terms of good operability and low cost of the rotating ring.

Typical configuration of the lens hood of the first embodiment of the present invention Sectional drawing in the state which inserted the lens apparatus in the lens hood of 1st Example of this invention The figure which shows a part of structure which looked at the lens hood of the state of FIG. 2 from the optical axis direction Sectional drawing in the state which fixed the lens apparatus to the lens hood of 1st Example of this invention The figure which shows a part of structure which looked at the lens hood of the state of FIG. 4 from the optical axis direction Typical configuration of the lens hood of the second embodiment of the present invention Sectional drawing in the state which inserted the lens apparatus in the lens hood of 2nd Example of this invention Sectional drawing in the state which fixed the lens apparatus to the lens hood of 2nd Example of this invention The figure which shows a part of structure which looked at the lens hood of the state of FIG. 8 from the optical axis direction

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing a typical configuration of a lens hood of the present invention that is detachably attached to a lens device.

A lens hood according to a first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a typical configuration of a lens hood according to a first embodiment of the present invention.

  An outer diameter portion 1 a and a flange surface 1 b are provided at the subject-side tip of the lens device 1. The outer diameter portion 1a is provided with a positioning groove 1c in the circumferential direction, and the positioning groove 1c has a shape in which a part of the outer diameter portion 1a is cut out over the entire circumference. In the description of the lens hood in the present specification, the subject side and the image side indicate directions on the subject side and the image side of the lens device when the lens hood is mounted on the lens barrel of the lens device. Shall. The optical axis direction is described as indicating the optical axis direction of the lens device to be mounted.

  The lens hood 2 includes a hood frame 3 (3a, 3b, 3c, 3d, 3e), a hood body 4, a rotating ring 5, a leaf spring (biasing means, a first urging member) 6, a pressing plate 7, and a screw 8. The optical filter 10 is detachably mounted on the lens hood 2.

The hood frame 3 is formed in an annular shape by an elastic material typified by a resin, and has a first inner diameter portion 3a and a second inner diameter portion having an inner diameter larger than the inner diameter of the inner diameter surface of the first inner diameter portion 3a. 3b is provided. The first inner diameter portion 3a is located closer to the image side than the second inner diameter portion 3b. A notch 3c is provided between the first inner diameter portion 3a and the second inner diameter portion 3b. The notch 3c extends in the circumferential direction and penetrates from the object side to the image side of the hood frame 3. Further, a recess 3d in which a part of the second inner diameter portion 3b is cut out in the radial direction enlargement side is provided, and a screw portion 3e is provided on the object side surface from the second inner diameter portion 3b.
The hood body 4 is integrally joined to the hood frame 3 by bonding or integral molding.

  The rotation ring 5 is inserted into the second inner diameter portion 3b of the hood frame 3 so as to be rotatable from the subject side. The rotating ring 5 is provided with a filter screw 5a and a filter knob (operation unit) 5b. The filter knob 5b protrudes from the rotating ring 5 to the image side. When the rotating ring is inserted into the hood frame 3, the filter knob 5b passes through the notch (opening) 3c of the hood frame 3 to the image side surface (outer peripheral surface) of the lens hood 2. Penetrate.

  The leaf spring 6 is fitted into the recess 3d of the hood frame 3 and urges the rotating ring 5 from the radially outer side.

The holding plate 7 restricts the movement of the rotating ring 5 and the leaf spring 6 in the optical axis direction, thereby preventing the rotating ring 5 and the leaf spring 6 from moving to the subject side and dropping off.
The screw 8 is screwed into the screw portion 3 e of the hood frame 3 to fix the holding plate 7 to the hood frame 3.

  The hood knob (hood fixing means) 9 is screwed into the hood frame 3 and is configured to be able to advance and retreat in a substantially central direction (inner diameter direction) of the hood frame.

  The optical filter 10 is screwed and fixed to the filter screw 5a of the rotating ring 5, and is rotated integrally with the rotating ring 5 around the optical axis by operating the filter knob 5b.

  FIG. 2 shows a cross section when the lens device 1 is inserted into the lens hood 2 where the tip of the lens device on the subject side can be inserted.

  The outer diameter portion 1a of the subject side portion of the lens barrel of the lens device 1 is inserted into the first inner diameter portion 3a of the hood frame 3, and the flange surface 1b of the lens device 1 and the image side rear end surface of the hood frame 3 come into contact with each other. .

  At this time, the difference (diameter difference) between the outer diameter of the outer peripheral surface of the outer diameter portion 1a of the lens device 1 and the inner diameter of the first inner diameter portion 3a of the hood frame 3 is A, and the hood frame 3 When the difference (diameter difference) between the inner diameter of the inner surface of the second inner diameter portion 3b and the outer diameter of the outer surface of the rotating ring 5 is B, the dimensional relationship is such that B is larger than A. ing.

FIG. 3 shows a part of the configuration of the lens hood 2 as viewed from the arrow Z at this time.
The recess 3d provided by cutting out a part of the second inner diameter portion 3b of the hood frame 3 on the radially enlarged side is provided at two substantially symmetrical positions with the hood knob 9 interposed therebetween in the circumferential direction. The leaf spring 6 is inserted between the rotary ring 5 and the rotary ring 5.

  If the direction in which one leaf spring 6 biases the rotating ring 5 is indicated by an arrow C, the resultant force is an arrow C ′, which is directed to a substantially opposite surface across the hood knob 9 of the second inner diameter portion 3b and the optical axis. Then, the rotating ring 5 is urged.

  When the hood knob 9 is tightened and the lens hood 2 is fixed to the lens device 1, the state shown in FIG.

The lens hood 2 is shifted to the lens device 1 by the axial force of the hood knob 9 and the hood frame 3 formed of an elastic material is deformed, so that the original diameter difference A is directly below the hood knob 9. A large gap D is generated.
FIG. 5 shows a part of the configuration of the lens hood 2 as viewed from the arrow Z at this time.

  When the hood knob 9 is operated to fix the lens hood 2 to the lens device 1, the tip 9 a of the hood knob 9 is further tightened while abutting against the bottom surface of the positioning groove 1 c of the lens device 1. The hood frame 3 is deformed by the force of the hood knob 9, but is deformed along the shape of the outer diameter portion 1 a of the lens device 1 within the range E. In other ranges, it is separated from the outer diameter portion 1a. The deformation of the hood frame 3 within the range E is not greatly deformed beyond the original diameter difference A due to the outer diameter portion 1a, and the outer diameter and the second inner diameter portion of the rotating ring 5 after deformation due to mounting. A gap corresponding to the difference between the diameter differences A and B remains between 3b. Furthermore, since the rotating ring 5 is urged by the leaf spring 6 in the direction of the arrow C ′, which is the resultant force of the arrow C, the rotating ring 5 has a surface on which deformation of the hood frame 3 is restricted by the outer diameter portion 1a. It is urged toward, and rattling is reduced.

  As described above, even if the lens hood of the present invention is a resin hood frame, the motion of the rotating ring is hindered by deformation in order to reduce rattling with a spring while providing an appropriate diameter difference. It is possible to rotate smoothly.

  In the present embodiment, the leaf spring 6 is used as the urging means for the rotating ring 5, but the effect is the same even with an elastic member such as a coil spring or rubber.

  Further, the leaf spring 6 is configured at two positions with the phase of the hood knob 9 interposed therebetween. However, the deformation of the hood frame 3 is urged toward the range E regulated by the outer diameter portion 1a of the lens device 1. If there is, the direction and the number do not matter.

  In this embodiment, the hood knob 9 has a screwing structure that is screwed into the hood frame 3 and the tip 9a abuts on the positioning groove 1c so as to prevent the lens hood from coming off. The effect is the same even if it is prevented from coming off via another component without directly contacting the positioning groove 1c. A means for urging a part of the inner peripheral surface of the first inner diameter portion 3 a of the hood frame 3 to a part of the outer peripheral surface of the front end of the lens device 1 to fix the hood frame 3 to the front end of the lens device 1. For example, the present invention is not limited to the hood knob 9 exemplified as means for attaching and fixing the lens hood to the tip of the lens device.

  Furthermore, a lens in which parts having different linear expansions are combined by ensuring that the amount of gap (B-A) after deformation due to fixation is larger than the difference in dimensional change at the time of temperature change between the hood frame 3 and the rotating ring 5. Even if it is a hood, it is possible to always maintain a good operational feeling.

Hereinafter, a lens hood according to a second embodiment of the present invention will be described with reference to FIGS.
FIG. 6 shows a typical configuration of the lens hood of the second embodiment of the present invention.
Since the configuration of the lens apparatus 1 is the same as that of the first embodiment, the description thereof is omitted.

  The lens hood 11 includes a hood frame 12 (12a, 12b, 12c, 12d, 12e), a hood body 13, a rotating ring 14, a wave washer (biasing means, a second urging member) 15, a pressing plate 16, and a screw 17. The optical filter 10 is detachably attached to the lens hood 11.

The hood frame 12 is formed of an elastic material typified by resin, and includes a first inner diameter portion 12a, a second inner diameter portion 12b larger than the first inner diameter portion 12a, and a first taper whose diameter decreases toward the image side. A surface 12c is provided. The first inner diameter portion 12a is located closer to the image side than the second inner diameter portion 12b. A notch 12d that extends in the circumferential direction and penetrates from the object side to the image side of the hood frame 12 is provided between the first inner diameter portion 12a and the second inner diameter portion 12b. Furthermore, a screw portion 12e is provided on the object side surface from the second inner diameter portion 12b.
The hood main body 13 is integrally joined to the hood frame 12 by bonding or integral molding.

  The rotating ring 14 is inserted into the second inner diameter portion 12b of the hood frame 12 from the subject side so as to be rotatable. The rotating ring 14 is provided with a filter screw 14a, a filter knob 14b, a second tapered surface 14c substantially parallel to the first tapered surface 12c of the hood frame 12, and a flange surface 14d on the image side. The filter knob 14b protrudes from the rotating ring 14 to the image side. When the rotating ring 14 is inserted into the hood frame 12, the filter knob 14b passes through the notch 12d of the hood frame 12 to the image side surface of the lens hood 11.

  The wave washer 15 is disposed on the subject side of the flange surface 14d of the rotating ring 14, is compressed by the pressing plate 16, and biases the rotating ring 14 in the optical axis direction.

The screw 17 is screwed into the screw portion 12 e of the hood frame 12 to fix the holding plate 16 to the hood frame 12.
The hood knob 18 is configured to be screwed into the hood frame 12 so that the hood knob 18 can be advanced and retracted in a substantially central direction of the hood frame.

  The optical filter 10 is screwed and fixed to the filter screw 14a of the rotating ring 14, and is rotated integrally with the rotating ring 14 around the optical axis by operating the filter knob 14b.

FIG. 7 shows a cross section when the lens device 1 is inserted into the lens hood 11.
The outer diameter portion 1a of the lens device 1 is inserted into the first inner diameter portion 12a of the hood frame 12, and the flange surface 1b of the lens device 1 and the image side rear end surface of the hood frame 12 come into contact with each other.

  At this time, the difference in diameter between the outer diameter portion 1a of the lens device 1 and the first inner diameter portion 12a of the hood frame 12 is F, and the second inner diameter portion 12b of the hood frame 12 and the outer diameter of the rotating ring 14 are When the difference in diameter is G, the dimensional relationship is such that G is larger than F.

  The rotating ring 14 is urged by a wave washer 15, and the first tapered surface 12c of the hood frame 12 and the second tapered surface 14c of the rotating ring 14 are in contact with each other.

  When the hood knob 18 is tightened and the lens hood 11 is fixed to the lens apparatus 1, the state shown in FIG. 8 is obtained.

The lens hood 11 is offset with respect to the lens apparatus 1 by the axial force of the hood knob 18, and the hood frame 12 is further deformed, so that a gap H larger than the original diameter difference F is generated immediately below the hood knob 18.
FIG. 9 shows a part of the configuration of the lens hood 11 viewed from the arrow Z at this time.

  When the hood knob 18 is operated, the tip 18a of the hood knob 18 is further tightened while abutting against the bottom surface of the positioning groove 1c of the lens device 1. The hood frame 12 is deformed by the force of the hood knob 18, but is deformed along the shape of the outer diameter portion 1 a of the lens device 1 within the range I. In other ranges, it is separated from the outer diameter portion 1a. The deformation of the hood frame 12 within the range I is not greatly deformed more than the original diameter difference F due to the outer diameter portion 1a, and the outer diameter and the second inner diameter of the rotating ring 14 after the deformation due to the mounting. A gap corresponding to the difference between the diameter differences G and F remains between the portion 12b. Further, the rotating ring 14 is urged by a wave washer 15 in a direction in which the first tapered surface 12c and the second tapered surface 14c are in contact with each other. Therefore, the second tapered surface 14 c of the rotating ring 14 is in contact with the first tapered surface 12 c in the range I.

  As described above, even if the lens hood of the present invention is a resin hood frame, the motion of the rotating ring is hindered by deformation in order to reduce rattling with a wave washer while providing an appropriate diameter difference. It is possible to rotate smoothly.

  Further, since the hood frame and the rotating ring come into contact with each other at the tapered surfaces, when the lens hood is fixed to the lens device, the rotation center of the rotating ring comes closer to the optical axis of the lens device.

  As a result, when the glass of the optical filter mounted on the rotating ring is not a flat surface and is composed of at least one lens having a curvature, the optical axis of the optical filter and the optical axis of the lens device are made closer to each other by increasing the optical axis. It becomes possible to maintain performance.

  In this embodiment, the wave washer 15 is used as the biasing means for the rotating ring 14, but the effect is the same even with an elastic member such as a coil spring or rubber.

  In this embodiment, the tip 18a of the hood knob 18 abuts on the positioning groove 1c to prevent the lens hood from coming off. However, the hood knob 18 does not directly abut on the positioning groove 1c, and another part is attached. The effect is the same even if it is prevented from coming off.

  With the lens hood having the above configuration, even if it is a resin hood frame, the rattling is reduced by a spring while providing an appropriate diameter difference, so that the operation of the rotating ring is not hindered by deformation and is smooth. It is possible to provide a lens hood that can be operated with good rotation. In addition, the lens apparatus including the lens hood of the present invention can realize a lens apparatus that enjoys the effects of the lens hood of the present invention and maintains a good photographing state.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

2: Lens hood 3: Hood frame 3a: First inner diameter part 3b: Second inner diameter part 5: Rotating ring 6: Leaf spring (biasing means, first biasing member)
9: Food knob (hood fixing means)
10: Optical filter 15: Wave washer (biasing means, second urging member)

Claims (9)

A lens hood detachable from the lens device,
A first inner diameter portion and a second inner diameter portion, a tip of the lens device can be inserted into the first inner diameter portion; a hood frame formed of an elastic material;
Urges the portion of the inner peripheral surface of the first inner diameter portion of the hood frame on a part of the outer peripheral surface of the distal end of the lens device, to fix the hood frame to said front end of said lens device hood Fixing means;
A rotating ring that is rotatably inserted into the second inner diameter portion of the hood frame and to which an optical filter can be attached;
Urging means for urging the rotating ring toward the second inner diameter portion,
The difference between the inner diameter of the second inner diameter portion and the outer diameter of the rotating ring is larger than the difference between the outer diameter of the tip of the lens device and the inner diameter of the first inner diameter portion.
This is a lens hood.   2. The lens hood according to claim 1, wherein the biasing unit biases a part of the outer peripheral surface of the rotating ring to a part of the inner peripheral surface of the second inner diameter portion. It said biasing means is disposed on a portion of the second inner diameter portion, the resilient member you urging a portion of the outer peripheral surface of the rotating ring part of the inner peripheral surface of the second inner diameter portion The lens hood according to claim 2, further comprising : It said second inner diameter portion comprises a first tapered surface inner diameter that a smaller as the distance from the first inner diameter portion,
It said biasing means includes a resilient member you biasing the rotating ring to said first tapered surface,
The lens hood according to claim 2. The rotating ring includes a second tapered surface that contacts the first tapered surface,
The elastic member, you biasing said second tapered surface of the rotating ring to said first tapered surface of the second inner diameter portion,
The lens hood according to claim 4. Before SL elastic member, a lens hood according to claim 4 or 5 comprising a wave washer, it is characterized. The rotating ring includes an operation unit,
The hood frame has an opening for projecting the operating portion and the operation portion by penetrating to the outside of the hood frame in the radial direction of the hood frame,
Lens hood according to any one of claims 1 to 6, characterized in that. The hood fixing means, according to said first inner diameter portion have a structure to be screwed into the screw hole penetrating in the radial direction, is movable back and forth at the radial direction of the hood frame, characterized in that lens hood according to any one of claim 1 to 7. At its tip, a lens and wherein the lens hood is fixed according to any one of claims 1 to 8.

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