JP2012168457A - Blower for lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blower for a lens, which can be attached to a lens and can prevent adhesion of foreign matter to the lens.SOLUTION: The blower 1 for a lens, according to the present invention, comprises: a cylindrical blower part 3 with a lens leading end side opening 3a, which has a substantially cylindrical shape able to be disposed outside a lens barrel 22, provided with an internal space 30 along the circumference of the cylinder, and configured to blow air, flowing in the internal space 30, in an outward direction from one opening of the cylinder; and a pedestal part 4 in which a mount part 43 to be mounted on a camera 2 is provided on one side, a hold part 45 for holding the cylindrical blow part 3 is provided on the other side and having a blowing structure 46 for blowing air to the internal space 30 of the cylindrical blow part 3 and a telescopic structure able to be extended or shorted in a longitudinal direction. The pedestal part 4 can be attached to the camera 2 so that the lens barrel 22 is located inside the cylindrical blower part 3.

Description

  The present invention relates to a lens blower.

  2. Description of the Related Art Conventionally, when shooting in rainy weather, waterside, or the like using a camera, foreign matter such as water droplets may adhere to the lens, and an image with a desired quality may not be captured. For this reason, a technique has been proposed in which a wiper is attached to the lens and foreign matters such as water droplets attached to the lens are removed by the wiper (see, for example, Patent Document 1).

JP 2003-219237 A

  However, the technique described in Patent Document 1 is a technique for removing adhered foreign substances and does not prevent the adhesion of foreign substances. There is also a problem that the wiper cannot be moved during shooting.

  The subject of this invention is providing the air blower for lenses which can be mounted | worn with a lens and can prevent adhesion of the foreign material with respect to a lens.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. The configuration described with reference numerals may be improved as appropriate, or at least a part of the configuration may be replaced with another component.
The invention according to claim 1 has a substantially cylindrical shape that can be disposed outside the lens barrel (22), and an internal space (30) is provided along the circumference of the cylinder, A cylindrical blower (3) provided with a lens tip side opening (3a) for blowing air flowing through the space (30) in a direction outward from one opening (3a) of the cylinder, and attached to the camera (2). A mounting portion (43) is provided on one side, and a holding portion (45) for holding the cylindrical air blowing portion (3) is provided on the other side, and the internal space (30) of the cylindrical air blowing portion (3) is provided. And a pedestal part (4) having a blowing structure (46) for sending air and a telescopic structure that can be expanded and contracted in the longitudinal direction, and the lens barrel (22) is located inside the cylindrical blowing part (3). A lend that can mount the pedestal (4) to the camera (2) Is the use blower (1).
A second aspect of the present invention is the lens blower device (1) according to the first aspect, wherein the cylindrical blower (3) has a side surface whose diameter decreases in the air blowing direction. It is the air blower for lenses (1) characterized by having a substantially cylindrical shape inclined.
The invention according to claim 3 is the lens blower device (1) according to claim 1, wherein the lens blower (3) is spaced apart from the cylindrical blower part (3) in the blowing direction of the cylindrical blower part (3). And a mounting ring (5) that can be mounted on the tip of the lens barrel (22), and extends between the cylindrical blower (3) and the mounting ring (5) in the blowing direction. The cylindrical blower part (3) moves in the axial direction as the mounting ring (5) moves in the axial direction due to expansion and contraction of the lens barrel (22). The lens blower (1) is characterized in that the pedestal (4) expands and contracts by the movement of the blower (3).
A fourth aspect of the present invention is the lens blower device (1) according to the third aspect, wherein the mounting ring (5) is a first ring (51) mounted on the lens barrel (22). ) And a second ring (52) disposed outside the first ring (51), and the first ring (51) and the second ring (52) extend in the radial direction. The lens blower (1) is characterized by being connected by a plurality of arms (53).
A fifth aspect of the present invention is the lens blower device (1) according to the fourth aspect, wherein the extending portion (6) is formed from the small diameter side of the cylindrical blower portion (3). A lens blower (1) characterized in that air blown to the two ring (52) is guided to the tip of the lens barrel (22).
A sixth aspect of the present invention is the lens blower device (1) according to any one of the first to fourth aspects, wherein the mounting portion (43) is mounted on a tripod of the camera (2). The lens blower (1) is attached to the camera (2) via a screw part (23) for use.

  According to the present invention, it is possible to provide a lens blower that can be attached to a lens and can prevent foreign matter from adhering to the lens.

It is a perspective view which shows the state in which the air blower for lenses in embodiment of this invention was attached to the camera. It is a front view of the air blower for lenses in the embodiment of the present invention. It is a partial cross section figure of the direction along the optical axis of the air blower for lenses.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a lens blower 1 and a camera 2 to which the lens blower 1 is attached according to an embodiment of the present invention. FIG. 2 is a front view of the lens blower 1 (viewed from the subject side).

  The camera 2 includes a camera body 21 and a lens barrel 22 that can be attached to and detached from the camera body 21. A tripod can be attached to the camera body 21, and a screw hole 23 for attaching a tripod is provided on the bottom surface of the camera body 21.

  The lens barrel 22 is a zoom lens including a plurality of lens groups. A lens mount (not shown) is provided at the end of the lens barrel 22 on the photographer side in the optical axis A direction. This lens mount is detachable from a camera mount (not shown) provided on the subject side of the camera body 21. The lens barrel 22 can be expanded and contracted in the optical axis A direction according to zooming, for example. A thread groove 24 for attaching a filter to the lens is provided at the tip of the lens barrel 22 on the subject side.

  The lens blower 1 includes a cylindrical blower 3, a pedestal 4 that holds the cylindrical blower 3, an extension 6 that extends from the cylindrical blower 3, and a detachable attachment to the extension 6. And a mounting ring 5 that can be mounted in the thread groove 24 of the lens barrel 22.

  The pedestal portion 4 has a shape in which square cylinders having similar shapes and different sizes are combined in a nested manner in a cross section perpendicular to the optical axis A. The largest rectangular tube is a main body 41 fixed to the camera 2. A blower structure 46 for supplying air to the cylindrical blower 3 is provided inside the main body 41. A switch 42 for operating the air blowing structure 46 is provided on the side of the photographer of the main body 41.

The main body portion 41 is provided with an attachment portion 43 for attachment to the camera. The mounting portion 43 includes an opening 43 a and a screw 43 b that passes through the opening 43 a and can be screwed into the screw hole 23 for mounting the tripod of the camera 2.
The cylindrical air blower 3 is mounted on the outer periphery of the camera 2 so that the screw hole 23 for attaching the tripod of the camera 2 and the central axis of the opening 43a of the attachment 43 are aligned. Then, the cylindrical blower 3 is fixed to the camera 2 by screwing the screw 43 b into the screw hole 23.

  The blower structure 46 takes in air from the surroundings and supplies the taken air to the cylindrical blower 3. When the photographer turns on / off the switch 42, the air blowing structure 46 is activated / stopped.

  The cylindrical air blower 3 has a shape that is obtained by cutting the side surface of the cone by two surfaces perpendicular to the central axis as a schematic shape, and the diameter decreases in the direction from the camera side opening 32 toward the lens front end side opening 33. So that its slope is inclined. That is, the lens tip side opening 33 in the cylindrical blower 3 has a smaller diameter than the camera side opening 32. The angle of inclination of the inclined surface with respect to the optical axis A in the cylindrical air blower 3 is such that the lens barrel 22 flows when the flow of air blown from the cylindrical air blower 3 flows from the camera side to the lens side, as will be described later. It is adjusted so that it flows in the direction approaching the tip. That is, adjustment is made so that the airflow is directed toward the tip of the lens.

  FIG. 3 is a partial cross-sectional view in the direction along the optical axis A of the lens blower 1. The shape of the side surface of the cylindrical blower 3 will be described in more detail. The side surface has a hollow internal space 30 surrounded by a wall portion 34. Inside the camera side opening 32 in the wall portion 34, a slit 3a is provided in the circumferential direction, and the air sent from the blower mechanism to the internal space 30 of the lens blower 1 flows out of the slit 3a to the outside. The The air that has flowed out is guided to the inner surface of the wall 34 of the cylindrical blower 3 and the extension 6 and flows so as to concentrate near the tip of the lens barrel 22 as indicated by an arrow F in FIG. .

  Returning to FIG. 1, in the pedestal portion 4, the tip square tube portion 44 having the smallest cross section among the square tube portions extending from the main body portion 41 is provided with a holding portion 45 that holds the cylindrical air blowing portion 3. In the holding part 45, the cylindrical air blowing part 3 can rotate in a direction indicated by C in the figure, with an axis B orthogonal to the longitudinal direction of the pedestal part 4 and extending in the radial direction of the cylindrical air blowing part 3. Is held in.

  Next, the mounting ring 5 will be described. The mounting ring 5 is disposed so as to be separated from the distal end side in the axial direction of the cylindrical air blowing portion 3. Moreover, it can attach or detach with respect to the extension part 6 extended from the cylindrical ventilation part 3. FIG. The mounting ring 5 includes a first ring 51 that is mounted on the tip of the lens barrel 22, and a second ring 52 that is disposed outside the first ring 51. As shown in FIG. 2, the first ring 51 and the second ring 52 are arranged on the same plane orthogonal to the optical axis A of the lens barrel 22.

The first ring 51 is provided with a threaded portion 51 a having a diameter that is screwed into a thread groove 24 for attaching a filter provided in the lens barrel 22. The second ring 52 has a larger diameter than the first ring 51 and a smaller diameter than the cylindrical blower 3. A plurality of arm portions 53 are bridged between the second ring 52 and the first ring 51.
The mounting ring 5 having the first ring 51, the second ring 52, and the arm portion 53 is formed by screwing the screw portion 51 a of the first ring 51 into the screw groove 24 at the tip of the lens barrel 22. The cylinder 22 can be attached.

  Further, the extending portion 6 extends between the second ring 52 of the mounting ring and the cylindrical air blowing portion 3. The extending part 6 is a plate-like member that extends from the lens tip side opening 33 of the cylindrical air blowing part 3 to the second ring 52. For example, three extending portions 6 are provided at equal intervals from the cylindrical air blowing portion 3 toward the second ring 52. A sufficient gap is provided between the adjacent extending portions 6 and the extending portions 6. The photographer can swing to the lens barrel 22 through the gap, and the zoom operation of the lens barrel 22 is possible. Further, the length of the extending portion 6 is such that the air flowing from the cylindrical blower portion 3 has an optimum flow at the tip of the lens barrel 22. The distal end of the extending part 6 is curved, and the second ring 52 can be attached to the extending part 6 by fitting the second ring 52 into the curved part. The extending portion 6 is made of a material having a spring property, and can be fitted even when the diameter of the second ring 52 is different.

Next, a method for mounting the lens blower 1 will be described.
First, the cylindrical blower 3 is disposed on the outer periphery of the lens barrel 22 with the mounting ring 5 removed. Then, the centers of the screw hole 23 of the camera 2 and the opening 43 a of the attachment portion 43 are matched, and the screw 43 b is screwed into the screw hole 23. Thereby, the cylindrical air blower 3 is fixed to the camera 2.

A plurality of mounting rings 5 are prepared in accordance with the lens diameter at the tip of the lens barrel 22. The user selects the mounting ring 5 that matches the lens diameter to be used. Then, the first ring 51 of the mounting ring 5 is screwed into the groove 23 provided at the tip of the lens barrel 22.
Next, the second ring 52 and the extending portion 6 are connected by fitting the second ring 52 into the curved portion at the tip of the extending portion 6. Since the extension part 6 is manufactured with the material which has a spring property, even if the diameter (namely, diameter of the 2nd ring 52) of the mounting ring 5 differs, attachment is possible.

  Here, when the distance between the mounting ring 5 and the cylindrical air blowing part 3 does not match the length of the extending part 6, the telescopic square tube of the pedestal part 4 is expanded and contracted, and the main body part of the pedestal part 4 The distance between 41 and the holding part 45 is adjusted. And the extension part 6 and the attachment ring 5 (2nd ring 52) are connected, making the distance between the attachment ring 5 and the cylindrical ventilation part 3 correspond with the length of the extension part 6. FIG.

  According to this embodiment, since the pedestal portion 4 expands and contracts in this way, the distance between the cylindrical air blowing portion 3 and the tip of the lens barrel 22 can be kept constant even in the lens barrel 22 having different lengths. An optimum wind force can be obtained at the tip of the lens barrel 22.

For example, when taking a photograph in an environment where splashes exist or an environment where there are many dusts such as dust, there is a possibility that water droplets or dust may adhere to the lens. In such a case, the photographer presses the switch 42 to activate the air blowing mechanism.
If it does so, air will be sent to the cylindrical ventilation part 3 by a ventilation mechanism, and it will ventilate from the slit 3a of the cylindrical ventilation part 3. FIG.
This wind flows between the outer periphery of the lens barrel 22 and the cylindrical blower 3. At this time, the air flow is guided by the shape of the inner surface of the wall portion 34, and the wind passes between the first ring 51 and the second ring 52 along the direction F of the arrow F in FIG. It flows toward. With this flow, it is possible to blow off water droplets, dust, and the like floating so as to approach the lens at the tip of the lens barrel 22.

A plate-like extension 6 extends between the cylindrical blower 3 and the second ring 52 disposed outside the first ring 51 attached to the tip of the lens barrel 22. The extending part 6 guides the air blown from the small diameter side of the cylindrical air blowing part 3 to the second ring 52 to the tip of the lens barrel 22.
Therefore, the air flow is concentrated on the tip of the lens barrel 22, and the amount of air flowing at the tip of the lens barrel 22 is maximized, so that water droplets and dust are better prevented from adhering to the lens.

  When zooming of the lens barrel 22 is performed, the tip of the lens barrel 22 also expands and contracts in the optical axis A direction. At this time, the mounting ring 5 attached to the tip of the lens barrel 22 also moves. In this case, according to the present embodiment, the cylindrical air blower 3 is also pulled through the extending portion 6, but the pedestal portion 4 expands and contracts, so that the main body 41 of the pedestal portion 4 remains fixed to the camera 2 and is cylindrical. The air blower 3 is movable.

  Depending on the camera 2 to which the lens blower 1 is attached, the tripod mounting screw hole 23 may not be provided in the center of the camera 2 in the width direction. In such a case, the pedestal 4 may not necessarily be extended parallel to the direction in which the lens barrel 22 extends.

  However, in the present embodiment, the cylindrical blower 3 is held rotatably about an axis B that is orthogonal to the longitudinal direction of the pedestal 4 and extends in the radial direction of the cylindrical blower 3. Therefore, even if the pedestal portion 4 extends obliquely from the attachment portion 43 to the holding portion 45 with respect to the direction in which the lens barrel 22 extends, by changing the angle of the cylindrical air blowing portion 3 by the holding portion 45, The air blower 3 can be attached along the direction in which the lens barrel 22 extends.

(Deformation)
The present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and these are also within the scope of the present invention.
(1) For example, in the present embodiment, the extending portion 6 and the mounting ring 5 are detachable, but the present invention is not limited to this, and the extending portion 6 and the mounting ring 5 are fixed and extended. The part 6 and the cylindrical air blowing part 3 may be detachable. Further, the first ring 51 and the second ring 52 may be detachable from the mounting ring 5.
(2) The telescopic structure of the pedestal part 4 is not limited to the nested shape, and may be a bellows structure, for example.
In addition, although embodiment and a deformation | transformation form can also be used in combination as appropriate, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

  1: lens blower, 2: camera, 3: cylindrical blower, 3a: slit, 4: pedestal, 5: mounting ring, 6: extension, 22: lens barrel, 30: internal space, 43 : Mounting part, 45: holding part, 46: blower structure, 51: first ring, 52: second ring

Claims (6)

It has a substantially cylindrical shape that can be placed outside the lens barrel, and an internal space is provided along the circumference of the cylinder, and air flowing through the internal space is directed outward from one opening of the cylinder. A cylindrical air blower provided with a lens front end opening for blowing air in a direction;
An attachment part to be attached to the camera is provided on one side, and a holding part for holding the cylindrical air blowing part is provided on the other side, and a blower structure that sends air into the internal space of the cylindrical air blowing part and is extendable in the longitudinal direction A pedestal having a telescopic structure,
A lens blower capable of mounting the pedestal on a camera so that a lens barrel is positioned inside the cylindrical blower. The lens blower according to claim 1,
The lens blower according to claim 1, wherein the cylindrical blower has a substantially cylindrical shape with a side surface inclined so that the diameter decreases in the air blowing direction. The lens blower according to claim 1,
A mounting ring that is disposed apart from the cylindrical air blowing portion in the air blowing direction of the cylindrical air blowing portion and can be attached to the tip of the lens barrel;
The cylindrical air blowing part and the mounting ring are connected by an extending part extending in the air blowing direction, and the cylindrical air blowing part is moved in the axial direction of the mounting ring due to expansion and contraction of the lens barrel. Moving in the axial direction, the pedestal portion expands and contracts by the movement of the cylindrical air blowing portion,
A lens blower characterized by the above. The lens blower according to claim 3,
The mounting ring is
A first ring attached to the lens barrel;
A second ring disposed outside the first ring,
The first ring and the second ring are connected by a plurality of arms extending in the radial direction,
A lens blower characterized by the above. The lens blower according to claim 4,
The extending portion guides air blown from the small diameter side of the cylindrical air blowing portion to the second ring to the tip of the lens barrel;
A lens blower characterized by the above. A blower device for a lens according to any one of claims 1 to 4,
The air blower for a lens, wherein the attachment portion is attached to the camera via a camera tripod attachment.

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