JP2018031956A - Insertion filter holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insertion filter holder that enables an operation to rotate a filter from outside an insertion filter holder body when mounted on an interchangeable lens, and has a dust-proof, drip-proof function while decreasing the number of parts.SOLUTION: An insertion filter holder has a recessed part, having a bag structure which isolates the inside and outside of the filter holder and surrounds an operation ring 20, formed in a filter holder body 10, and comprises a coupling gear 30 which is arranged in the filter holder body 10 and rotates in one body as the operation ring 20 rotates when the operation ring 20 is operated from outside to rotate coaxially with the operation ring 20. One plane among planes, perpendicular to an optical axis, of the recessed part has a shaft hole part where a shaft part of the coupling gear 30 fitted in the operation ring 20 is inserted and supported, an O ring 31 is provided at the coupling gear shaft part, and a filter gear 50 is provided which engages the coupling gear 30 to rotate a filter 61.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an insertion / removal insertion filter used for an optical device such as an interchangeable lens.

  Conventionally, in an insertion filter holder body that is inserted into and removed from an interchangeable lens, when attached to the interchangeable lens, a driving force is generated inside the insertion filter holder body by rotating an operation ring that can be rotated from the outside of the insertion filter holder body. Is transmitted to rotate the filter set in the insertion filter holder.

  In recent years, interchangeable lenses and camera bodies often have a dustproof and splashproof structure that prevents water and dust from entering from the outside to the inside. Similarly, the insertion filter holder used for such an interchangeable lens is also required to have a dustproof and drip-proof structure.

  The insertion filter holder described in Patent Document 1 can draw water from the filter holder without making the water that has entered the inside of the filter holder by making a hole in the filter holder appearance. Moreover, since water can be drained from the filter holder, a filter holder is disclosed that can prevent water from entering due to capillary action from the shaft portion of the rotation transmitting member.

  The insertion filter holder described in Patent Document 2 creates a recess that divides the outside and the inside of the filter holder body, places an operation ring in the recess outside the filter holder, and is coaxially connected to the operation ring inside the filter holder Disclosed is a filter holder that rotates a filter unit in an interlocking manner while obtaining a dustproof and dripproof function by disposing a gear.

JP 2000-249888 A JP 2011-141312 A

  However, the filter holder described in Patent Document 1 has a problem that when the amount of water entering the filter holder exceeds the amount of drainage, water enters the inside of the filter holder by capillary action due to the shaft portion of the rotation transmitting member. Have

  Moreover, although the filter holder of patent document 2 has acquired the dust-proof drip-proof function by providing an O-ring in the insertion part of the shaft member to a pair of partition walls of the filter holder, the number of parts constituting the filter holder There is a problem that there are many.

  The present invention has been made in view of such a situation. The filter can be rotated from the outside of the insertion filter holder main body when attached to the interchangeable lens, and has a dustproof and splashproof function while reducing the number of parts. It is an object to provide a built-in filter holder.

  A first invention which is means for solving the above problems is an insertion filter holder having a filter holder main body which can be inserted into and removed from the lens barrel by inserting the filter holder main body into the lens mirror. When inserted into the cylinder, the operating ring is rotated to transmit a driving force to the filter main body arranged inside the filter holder main body, and in the insertion filter holder for rotating the filter main body, the filter holder main body Forming a recess having a bag structure that separates the outside and the inside of the filter holder and surrounds the operation ring, is disposed inside the filter holder body, and is coaxial with the operation ring from the outside of the filter holder body. When the operation ring is rotated, it has a connecting gear that rotates integrally with the rotation of the operation ring, and is perpendicular to the optical axis of the recess. Of the surfaces, one surface has a shaft hole portion that inserts and supports the shaft portion of the connection gear that fits into the operation ring, and the connection gear shaft portion is provided with an O-ring and meshes with the connection gear. An insertion filter holder comprising a filter gear for rotating the filter body.

  The second invention, which is a means for solving the above-mentioned problems, is an insertion filter holder, which has a filter holder body that can be inserted into and removed from the lens barrel by insertion, and the filter holder body In the insertion filter holder for rotating the filter body by transmitting a driving force to the filter body disposed inside the filter holder body by rotating the operation ring when inserted into the lens barrel. A concave portion having a bag structure is formed in the holder body so as to isolate the outside and the inside of the filter holder and surround the operation ring, and is disposed inside the filter holder body and coaxial with the operation ring. When the operation ring is rotated from the outside, a connection gear that rotates integrally with the rotation of the operation ring is provided, and is connected to the optical axis of the recess. One surface of which has a shaft hole portion for inserting and supporting the shaft portion of the connection gear fitted to the operation ring, the connection gear shaft portion is provided with an O-ring, and the optical axis of the recess The other surface perpendicular to the operation ring has a filter gear that engages with the connection gear with a screw coaxial with the operation ring and rotates the filter body by meshing with the connection gear. Insert filter holder.

  Moreover, 3rd invention which is a means for solving the above-mentioned subject is an insertion filter holder as described in 1st invention, Comprising: The said operation ring and the said connection gear are directly fastened. A plug-in filter holder.

  Moreover, 4th invention which is a means for solving the above-mentioned subject is an insertion filter holder as described in 1st invention, Comprising: The shape of the sliding end surface of the said operation ring is non-circular shape. An insertion filter holder characterized by that.

  Further, a fifth invention which is means for solving the above-mentioned problem is an insertion filter holder which is either the first invention or the fourth invention, and is further disposed inside the filter holder body. An insertion filter holder having an idle gear that meshes with the coupling gear and the filter gear and transmits power to the filter gear by being driven and rotated as the coupling gear rotates.

  According to the present invention, the filter can be rotated from the outside of the insertion filter holder main body when attached to the interchangeable lens, and an insertion filter holder having a dustproof and splashproof function can be provided while reducing the number of parts.

1 is an exploded perspective view according to Embodiment 1 of the present invention. Sectional drawing which concerns on Example 1 of this invention Sectional drawing based on Example 2 of this invention

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.

  FIG. 1 is a drawing of an insertion filter holder 1 according to an embodiment of the present invention. FIG. 1 is simplified to simplify the description of the present invention. O in FIG. 1 represents an optical axis. 2 and 3 are cross-sectional views of the insertion filter holder taken along line A in FIG. Accordingly, in FIGS. 2 and 3, the optical axis O is positioned on the lower side in the figure, the vertical direction in the figure is a direction perpendicular to the optical axis, and the horizontal direction in the figures is a direction horizontal to the optical axis. 1 to 3, the left side is the object side, and the right side is the image sensor side.

  The insertion filter holder 1 can be inserted into and removed from an interchangeable lens barrel (not shown). The insertion filter holder 1 has an outer appearance plate 11 along the outer peripheral surface of the interchangeable lens barrel, and the outer appearance plate 11 is formed in a shape that matches a filter insertion port of an unillustrated interchangeable lens barrel so as to be watertight. It has a function.

  The filter holder body 10 has a recess. The recess is composed of a plane perpendicular to the two optical axes and a plane parallel to the one optical axis, and has a bag structure so as to surround the operation ring 20. One surface of the surfaces perpendicular to the optical axis forming the recess is provided with a shaft hole portion through which the shaft portion of the connection gear 30 passes. In addition, the top surface is provided with a protruding portion in which a part of the operation ring 20 protrudes from the opening of the appearance plate 11 to the outside of the insertion filter holder 1.

  The filter holder knob 12 is a knob for operating a notch that prevents the insertion filter holder 1 from falling off the interchangeable lens barrel when the insert filter holder 1 is inserted into the interchangeable lens barrel. By rotating the filter holder knob 12, a notch (not shown) is rotated in conjunction with it, and the notch is engaged with the interchangeable lens barrel, so that the plug-in filter holder 1 is locked to the interchangeable lens barrel. Therefore, it is possible to prevent the dropout, and by removing the engagement between the notch and the interchangeable lens barrel, the insertion filter holder 1 can be extracted from the interchangeable lens barrel.

  The buffer materials 13a and 13b are buffer materials having a dustproof and dripproof function. The buffer material 13a is disposed between the appearance plate 11 and the filter holder main body 10, and the buffer material 13b is arranged between the appearance plate 11 and an unillustrated interchangeable lens when the insertion filter holder 1 is inserted into the interchangeable lens barrel. It is placed between the lens barrel insertion filter insertion port and exhibits dustproof and splashproof function.

  The filter holder cover 14 is for improving the appearance by covering the steps of the filter holder body 10 and the like. It is not shown in FIG.

  The operation ring 20 is disposed in a recess formed by the filter holder main body 10 and protrudes outside the insertion filter holder 1 from a partially notched portion provided in the appearance plate 11. Therefore, the user can rotate the operation ring 20 from the outside of the insertion filter holder 1. When the operation ring 20 is rotated, the rotation is transmitted to the filter, and the filter can be rotated. Further, an inner circle of the operation ring 20 illustrated in FIG. 1 is a sliding end surface. The sliding end surface may be either an operation ring with respect to a direction parallel to the optical axis, and the shape of the sliding end surface is preferably a non-circular shape such as I-cut or D-cut.

  The connection gear 30 has the shaft portion of the operation ring 20 fitted to the shaft portion, and the operation ring 20 and the shaft portion are common, and the connection gear 30 and the operation ring 20 rotate as a unit.

  The O-ring 31 is disposed between the filter holder main body 10 and the connection gear 30. Since the connection gear 30 rotates integrally with the operation ring 20, a clearance is required between the connection gear 30 and the filter holder body 10 in order for the connection gear 30 to rotate. Accordingly, the O-ring 31 prevents water and dust from entering from the shaft hole provided in the surface perpendicular to the optical axis of the coupling gear 30 and the filter holder body 10.

  The idle gear 40 transmits rotation from the connecting gear 30 to the filter gear 50. In the present embodiment, an idle gear (not shown in FIGS. 2 and 3) is used, but a configuration in which a rotational motion is directly transmitted from the connecting gear 30 to the filter gear 50 may be employed.

  The filter gear 50 is fastened to the filter ring 60 by screwing. The filter ring 60, the filter glass 61, the filter glass presser 62, the filter ring presser 63, and the like are rotated as a unit by the force transmitted from the connection gear 30 or the idle gear 40.

  The filter ring 60 is fastened to the filter glass presser 62 by screwing, and sandwiches the filter glass 61.

  The filter glass 61 is a glass having a function of a PL filter that cuts unnecessary light reflected by the subject.

  The filter glass holder 62 is fastened to the filter ring 60 by screwing, and sandwiches the filter glass 61.

  The filter ring retainer 63 is fastened to the filter ring 60 by screwing, and sandwiches the filter holder main body 10.

  Therefore, the filter gear 50 and the filter glass holder 62 are fastened to the filter ring 60, and the filter ring 60 is attached to the filter holder main body 10 by the filter ring holder 63 and is integrated. Therefore, the filter gear 50, the filter ring 60, the filter glass 61, and the filter glass holder 62 rotate together.

  From the above, the user can set the PL filter at an appropriate rotation angle by rotating the operation ring 20, and the effect of the PL filter can be obtained.

  In the first embodiment of the present invention, in order to reduce the intrusion of water and dust into the filter holder main body 1 which is the object of the present invention, an external conduction path into the filter holder main body 10 is provided in the external plate 11. In order to pass the projecting portion of the operation ring 20 and the shaft portion of the connection gear 30, only a path passing through a shaft hole provided on one of the surfaces perpendicular to the optical axis of the recess is used. Furthermore, in order to prevent water and dust from entering the filter holder main body 10, a dust-proof and drip-proof function is provided around the two places of the operating ring 20 and the connecting gear 30 that are arranged on the aforementioned path and move. It is necessary to make it the structure which has. In addition, since the surface perpendicular to the optical axis of the concave portion that does not have the shaft hole portion does not have a configuration that communicates with the outside of the filter holder main body 10, there is no possibility that water or dust may enter.

  From the above, the appearance plate 11 and the buffer material 13a are arranged on the top surface side of the concave portion that the filter holder main body 10 constitutes. Further, in the portion where the shaft portion of the connection gear 30 penetrates, an O-ring is disposed at a position where the shaft portion of the connection gear 30 and the filter holder body 10 slide. As a result, the appearance plate 11 and the operation ring 20 are prevented from entering water and dust by the buffer material 13a, and the water and dust that have entered from the outside of the filter holder 1 when the user operates the operation ring 20. With respect to the filter holder main body 10, the O-ring 31 disposed between the connecting gear 30 and the filter holder main body 10 prevents water and dust from entering the filter holder main body 10.

  Moreover, in this invention, the function of a dust proof and drip proof is implement | achieved, although arrangement | positioning of the O-ring 31 is one place by restrict | squeezing the penetration path | route of the water and dust to the inside of the filter holder main body 10.

  Further, in order to prevent an increase in the number of parts, the operation ring 20 and the connection gear 30 according to the first embodiment are directly fastened without any members interposed therebetween by being fastened by a method such as screwing or press fitting.

  Further, when the user operates the operation ring 20 while pressing the filter gear 50 when the insertion filter holder body 1 is removed from the interchangeable lens barrel, a load is applied to the fastening portion between the operation ring 20 and the coupling gear 30. Thus, it is conceivable that the operation ring 20 and the connection gear 30 are disengaged if not sufficiently fastened. Therefore, it is necessary to ensure that the operation ring 20 and the connection gear 30 are fastened. Therefore, when assembling, the operation ring 20 and the connecting gear 30 are securely fastened by using a jig.

  Therefore, among the sliding end surfaces of the operation ring 20 of the first embodiment, the sliding end surface of the operation ring 20 in contact with the surface perpendicular to the optical axis of the concave portion constituting the filter holder main body 10 has an I-cut shape. By making the sliding end surface of the operation ring 20 into an I-cut, the operation ring 20 and the connection gear 30 can be securely fastened by screwing the connection gear 30 into the operation ring 20 pressed by a jig. Become. Moreover, since the shape of the sliding end surface of the operation ring 20 should just be able to fix a jig | tool, it is preferable that it is non-circular shape, such as D cut and I cut.

  Next, Example 2 will be described with reference to FIG.

  In the first embodiment, a recess is formed in the filter holder main body 10, and the operation ring 20 and the connection gear 30 are arranged in the recess. On the other hand, in the second embodiment, the operation ring 20 disposed in the recess is the same as the first embodiment, but the connecting gear 30 is divided into the connecting gear portion 300 and the shaft portion 301. Therefore, the surface perpendicular to the optical axis of the concave portion of the filter holder main body 10 is penetrated by the connecting gear portion 300 and the shaft portion 301 on one side, the screw 302 is penetrated on the opposite surface, and the screw 302 is engaged with the shaft portion 301.

  In addition, the fitting portion into which the connection gear 300 of the operation ring 20 is fitted has a non-circular shape. In this way, when the user operates the operation ring 20, the connection gear unit 300 rotates integrally with the operation ring 20. At that time, the contact portion between the filter holder main body 10 and the connecting gear 300 slides (first sliding portion). Further, since the shaft portion 301 is fixed to the surface perpendicular to the optical axis of the concave portion of the filter holder main body 10 by the screw 302, it slides between the connecting gear portion 300 and the shaft portion 301 (second sliding portion). .

  Next, the two sliding portions described above will be described.

  The first sliding portion is provided with an O-ring as in the first embodiment in order to ensure the function of dustproof and drip-proof. On the other hand, the second sliding portion applies grease between the connecting gear portion 300 and the shaft portion 301. By applying grease, the degree of closeness between the connecting gear portion 300 and the shaft portion 301 is increased, and it is possible to prevent water and dust from entering, and the connecting gear that rotates integrally when the user operates the operation ring 20. Smooth sliding between the portion 300 and the shaft portion 301 contributes to the feel.

  Further, by providing the screw 302, a screw hole is provided in a surface perpendicular to the optical axis of the concave portion of the filter holder main body 10, but the screw 302 is fastened to the shaft portion 301 so that the screw 302 and the screw of the filter holder main body 10 are provided. The holes are in close contact with each other and have a dustproof and splashproof function. Therefore, it is not necessary to arrange the O-ring 31 at this portion.

  In the first embodiment, it is required that the rotation axes of the operation ring 20 and the connection gear 30 are matched. That is, since the operation ring 20 and the connection gear 30 are fitted by screwing, both the operation ring 20 and the connection gear 30 require processing accuracy. Since the processing accuracy is poor, if the rotation axis of the operation ring 20 and the connection gear 30 do not coincide with each other, either the operation ring 20 or the connection gear 30 rotates eccentrically. As a result, when the user rotates the operation ring 20, the feeling becomes worse.

  On the other hand, in the second embodiment, the configuration of the connection gear 30 of the first embodiment is divided into the connection gear 300 and the shaft portion 301, and a screw hole is provided in the filter holder main body 10. As a result, since the fitting portion between the operation ring 20 and the connection gear 300 is non-circular, the machining accuracy is not required as compared with the screwing of the operation ring 20 and the connection gear according to the first embodiment. However, the operation ring 20 and the connecting gear 300 are reliably rotated integrally.

  The second embodiment has the same configuration as that of the first embodiment with respect to the idle gear 40 and the subsequent filter gear 50, filter ring 60, and the like.

  Further, the first embodiment and the second embodiment of the present invention are configured so that the driving force transmitted from the operation ring 20 to the connecting gear portion 30 by the operation of the user is transmitted to the filter gear via an idle gear (not shown in FIGS. 1 and 2). 50 is transmitted. However, it is possible to transmit the drive of the coupling gear 30 directly from the coupling gear 30 to the filter gear 50 without using the idle gear 40.

DESCRIPTION OF SYMBOLS 1 Plug filter holder 10 Filter holder main body 11 Appearance board 12 Filter holder knob 13a Buffer material 13b Buffer material 14 Filter holder cover 20 Operation ring 30 Connection gear 31 O ring 301 Shaft 302 Screw 40 Idle gear 50 Filter gear 60 Filter ring 61 Filter glass 62 Filter glass holder 63 Filter ring holder

Claims (5)

It has a filter holder body that can be inserted and removed by inserting it into the lens barrel.
When the filter holder main body is inserted into the lens barrel, the insertion ring rotates the operation ring to transmit the driving force to the filter main body arranged inside the filter holder main body and rotate the filter main body. In the holder,
Forming a recess in the filter holder body having a bag structure that isolates the outside and the inside of the filter holder and surrounds the operation ring,
A coupling gear that is disposed inside the filter holder body and rotates integrally with the rotation of the operation ring when the operation ring is rotated from the outside of the filter holder body coaxially with the operation ring;
Of the surface perpendicular to the optical axis of the recess, one surface has a shaft hole portion that inserts and supports the shaft portion of the connection gear that fits into the operation ring,
The connecting gear shaft portion is provided with an O-ring,
An insertion filter holder having a filter gear that rotates the filter main body by meshing with the connecting gear. It has a filter holder body that can be inserted and removed by inserting it into the lens barrel.
When the filter holder main body is inserted into the lens barrel, the insertion ring rotates the operation ring to transmit the driving force to the filter main body arranged inside the filter holder main body and rotate the filter main body. In the holder,
Forming a recess in the filter holder body having a bag structure that isolates the outside and the inside of the filter holder and surrounds the operation ring,
A coupling gear that is disposed inside the filter holder body and rotates integrally with the rotation of the operation ring when the operation ring is rotated from the outside of the filter holder body coaxially with the operation ring;
Of the surface perpendicular to the optical axis of the recess, one surface has a shaft hole portion that inserts and supports the shaft portion of the connection gear that fits into the operation ring,
The connecting gear shaft portion is provided with an O-ring,
The other surface perpendicular to the optical axis of the recess engages with the connecting gear with a screw coaxial with the operation ring,
An insertion filter holder having a filter gear that rotates the filter main body by meshing with the connecting gear.   The plug-in filter holder according to claim 1, wherein the operation ring and the connection gear are directly fastened.   The insertion filter holder according to claim 1 or 3, wherein a shape of a sliding end face of the operation ring is non-circular.   An idler gear is disposed inside the filter holder body, meshes with the coupling gear and the filter gear, and is driven to rotate as the coupling gear rotates to transmit power to the filter gear. The insertion filter holder according to any one of claims 1 to 4.

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