JP7039076B2 - Plug-in filter holder - Google Patents

Description

The present invention relates to a removable pluggable filter used in an optical device such as an interchangeable lens.

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

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

The plug-in filter holder described in Patent Document 1 can remove water from the filter holder without collecting water that has entered the inside of the filter holder by making a hole in the appearance of the filter holder. Further, since water can be drained from the filter holder, the filter holder capable of preventing the intrusion of water due to the capillary phenomenon from the shaft portion of the rotation transmission member is disclosed.

In the plug-in filter holder described in Patent Document 2, a recess for separating the outside and the inside is created in the filter holder main body, an operation ring is arranged in the recess outside the filter holder, and the operation ring is coaxially connected to the inside of the filter holder. We disclose a filter holder that rotates the filter unit in conjunction with it while obtaining a dustproof and splashproof function by arranging gears.

Japanese Unexamined Patent Publication No. 2000-2498888 Japanese Unexamined Patent Publication No. 2011-141312

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 infiltrates into the filter holder due to the capillary phenomenon due to the shaft portion of the rotation transmission member. Has.

Further, the filter holder described in Patent Document 2 has an O-ring at the insertion portion of the shaft member into the pair of partition walls of the filter holder to obtain a dustproof and drip-proof function, but the number of parts constituting the filter holder is obtained. Has the problem that there are many.

The present invention has been made in view of such a situation, and the filter can be rotated from the outside of the plug-in filter holder body when mounted on an interchangeable lens, and has a dust-proof and drip-proof function while reducing the number of parts. It is intended to provide a built-in filter holder.

The first invention, which is a means for solving the above-mentioned problems, is a plug-in filter holder, which has a filter holder body that can be inserted and removed by inserting it into a lens barrel, and the filter holder body is used as the lens mirror. By rotating the operation ring when it is inserted into the cylinder, the driving force is transmitted to the filter body arranged inside the filter holder body, and in the insertion filter holder that rotates the filter body, the filter holder body is subjected to. A recess having a bag structure that separates the outside from the inside of the filter holder and surrounds the operation ring is formed, and is arranged inside the filter holder main body, and is coaxial with the operation ring from the outside of the filter holder main body. When the operation ring is rotated, it has a connecting gear that rotates integrally with the rotation of the operation ring. The connecting gear consists of a connecting gear portion and a shaft portion, and is perpendicular to the optical axis of the recess. One of the surfaces has a shaft hole portion for inserting and supporting the shaft portion of the connecting gear fitted to the operation ring, and the connecting gear is provided with an O-ring and is perpendicular to the optical axis of the recess. The other side is a plug-in filter holder characterized by having a filter gear in which a screw coaxial with the operation ring and the shaft portion are fastened and mesh with the connecting gear to rotate the filter body.

Further, the second invention, which is a means for solving the above-mentioned problems, is the insertion filter holder according to the first invention, which is further arranged inside the filter holder main body, and is the connecting gear and the filter. A plug-in filter holder having an idle gear that meshes with a gear and transmits power to the filter gear by driven rotation accompanying the rotation of the connecting gear.

According to the present invention, it is possible to rotate the filter from the outside of the plug-in filter holder main body at the time of mounting on the interchangeable lens, and it is possible to provide a plug-in filter holder having a dust-proof and drip-proof function while reducing the number of parts.

An exploded perspective view according to a reference example of the present invention. Sectional drawing which concerns on reference example of this invention Sectional drawing which concerns on Example 1 of this invention

Reference example

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

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

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

The filter holder main body 10 is formed with a recess. This recess is composed of a surface perpendicular to the two optical axes and a surface parallel to the one optical axis, and has a bag structure so as to surround the operation ring 20. One of the surfaces perpendicular to the optical axis constituting the recess is provided with a shaft hole portion through which the shaft portion of the connecting gear 30 penetrates. Further, the top surface is provided with a protruding portion in which a part of the operation ring 20 projects 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 out of the interchangeable lens barrel when the insertion filter holder 1 is inserted into the interchangeable lens barrel. By rotating the filter holder knob 12, the notch (not shown) rotates in conjunction with it, and the notch engages 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 lens from falling off, and the insertion filter holder 1 can be pulled out from the interchangeable lens barrel by disengaging the engagement between the notch and the interchangeable lens barrel.

The cushioning materials 13a and 13b are cushioning materials having a dust-proof and drip-proof function. The cushioning material 13a is arranged between the appearance plate 11 and the filter holder main body 10, and the cushioning material 13b is an interchangeable lens (not shown) when the insertion filter holder 1 is inserted into the interchangeable lens barrel. It is placed between the lens barrel and the filter outlet to provide a dust-proof and drip-proof function.

The filter holder cover 14 is for improving the appearance by covering a step or the like of the filter holder main body 10. It is not shown in FIG.

The operation ring 20 is arranged in a recess formed by the filter holder main body 10, and protrudes to the outside of 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. By rotating the operation ring 20, the rotation is transmitted to the filter, so that the rotation of the filter can be adjusted. Further, the inner circle of the operation ring 20 shown in FIG. 1 is a sliding end face. The sliding end face may be either an operation ring in a direction parallel to the optical axis, and the shape of the sliding end face is preferably a non-circular shape such as an I-cut or a D-cut.

In the connecting gear 30, the shaft portion of the operation ring 20 is fitted to the shaft portion, the operation ring 20 and the shaft portion are shared, and the connecting gear 30 and the operation ring 20 rotate integrally.

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

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

The filter gear 50 is fastened to the filter ring 60 by screwing. The filter ring 60, the filter glass 61, the filter glass retainer 62, the filter ring retainer 63, and the like are integrally rotated by the force transmitted from the connecting gear 30 or the idle gear 40.

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

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

The filter glass retainer 62 is fastened to the filter ring 60 by screwing to sandwich 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 ring 50 and the filter glass retainer 62 are fastened to the filter ring 60, and the filter ring 60 is attached to and integrated with the filter holder main body 10 by the filter ring retainer 63. Therefore, the filter gear 50, the filter ring 60, the filter glass 61, and the filter glass retainer 62 rotate integrally.

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 reference example of the present invention, in order to reduce the intrusion of water and dust into the inside of the filter holder main body 1, which is the object of the present invention, an operation in which a conduction path from the outside to the inside of the filter holder main body 10 is provided on the appearance plate 11. Only the path passes through the protruding portion of the ring 20 and the shaft hole provided on one of the surfaces perpendicular to the optical axis of the recess in order to pass the shaft portion of the connecting gear 30. Further, in order to prevent water and dust from entering the inside of the filter holder main body 10, a dustproof and drip-proof function is provided around two places of the operation ring 20 and the connecting gear 30 which are arranged and movable on the above-mentioned path. It is necessary to have a configuration. Further, since the surface of the recess having no shaft hole and perpendicular to the optical axis does not have a structure that communicates with the outside of the filter holder main body 10, there is no possibility of becoming a source of water or dust.

From the above, the appearance plate 11 and the cushioning material 13a are arranged on the top surface side of the concave portion constituting the filter holder main body 10. Further, in the portion where the shaft portion of the connecting gear 30 penetrates, an O-ring is arranged at a position where the shaft portion of the connecting gear 30 and the filter holder main body 10 slide. As a result, with respect to the appearance plate 11 and the operation ring 20, the cushioning material 13a prevents water and dust from entering, and the user operates the operation ring 20 to prevent water and dust from entering from the outside of the filter holder 1. The O-ring 31 arranged between the connecting gear 30 and the filter holder main body 10 prevents water and dust from entering the inside of the filter holder main body 10.

Further, in the present invention, the dust-proof and drip-proof function is realized while the O-ring 31 is arranged in one place by narrowing down the intrusion route of water and dust into 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 connecting gear 30 of the reference example are directly fastened by fastening by a method such as screwing or press fitting so that no member is inserted between them.

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

Therefore, among the end faces of the operation ring 20 of the reference example, the end face 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 end surface of the operation ring 20 an I-cut, the operation ring 20 and the connection gear 30 can be securely fastened by screwing the connecting gear 30 into the operation ring 20 pressed by the jig. Further, the shape of the end face of the operation ring 20 is preferably a non-circular shape such as a D-cut, as long as the jig can be fixed.

Next, Example 1 will be described with reference to FIG.

In the reference example, a recess is formed in the filter holder main body 10, and is composed of an operation ring 20 and a connecting gear 30 arranged in the recess. On the other hand, in the first embodiment, the operation ring 20 arranged in the recess is the same as the reference example, but the connecting gear 30 is divided into the connecting gear portion 300 and the shaft portion 301. Therefore, on the surface of the recess of the filter holder body 10 perpendicular to the optical axis, the connecting gear portion 300 and the shaft portion 301 penetrate on one side, the screw 302 penetrates on the opposite surface, and the screw 302 engages with the shaft portion 301.

Further, the fitting portion into which the connecting gear 300 of the operation ring 20 is fitted has a non-circular shape. By doing so, when the user operates the operation ring 20, the connecting gear portion 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, the connecting gear portion 300 and the shaft portion 301 slide (second sliding portion). ..

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

In the first sliding portion, an O-ring is arranged as in the reference example in order to secure the function of dust-proof and drip-proof. On the other hand, in the second sliding portion, grease is applied 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, it is possible to prevent the intrusion of water and dust, and when the user operates the operation ring 20, the connection is integrally rotated. Smooth sliding between the gear portion 300 and the shaft portion 301 also contributes to the feel.

Further, by providing the screw 302, a screw hole is provided on the 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 to provide the screw 302 and the screw of the filter holder main body 10. It is in close contact with the hole and has a dustproof and drip-proof function. Therefore, it is not necessary to arrange the O-ring 31 in this portion.

In the reference example, it is required that the rotation axes of the operation ring 20 and the connecting gear 30 are aligned with each other. That is, since the operation ring 20 and the connecting gear 30 are fitted by screwing, processing accuracy is required for both the operation ring 20 and the connecting gear 30. If the rotation axes of the operation ring 20 and the connecting gear 30 do not match due to poor machining accuracy, either the operation ring 20 or the connecting gear 30 will rotate eccentrically. As a result, when the user rotates the operation ring 20, the feel is deteriorated.

On the other hand, in the first embodiment, the configuration of the connecting gear 30 of the reference example is divided into the connecting 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 connecting gear 300 has a non-circular shape, the processing accuracy cannot be required as compared with the screwing of the operation ring 20 and the connecting gear in the reference example, so that the processing is easy. The operation ring 20 and the connecting gear 300 rotate integrally.

In the first embodiment, the idle gear 40 and later, the filter gear 50, the filter ring 60, and the like have the same configuration as the reference example.

Further, in the reference example and the first embodiment of the present application, the filter gear 50 is operated by the user to transmit the driving force transmitted from the operation ring 20 to the connecting gear portion 30 via an idle gear (not shown in FIGS. 1 and 2). Drive transmission to. However, it is possible to directly transmit the drive of the coupling gear 30 from the coupling gear 30 to the filter gear 50 without going through the idle gear 40.

1 Plug-in filter holder 10 Filter holder body 11 Exterior plate 12 Filter holder knob 13a Cushioning material 13b Cushioning material 14 Filter holder cover 20 Operation ring 30 Connecting gear 31 O-ring 301 Shaft 302 Screw 40 Idle gear 50 Filter gear 60 Filter ring 61 Filter glass 62 Filter glass presser 63 Filter ring presser

Claims (2)

It has a filter holder body that can be inserted and removed by inserting it into the lens barrel.
When the filter holder body is inserted into the lens barrel, the operation ring is rotated to transmit the driving force to the filter body arranged inside the filter holder body to rotate the filter body. In the holder
A recess having a bag structure that separates the outside and the inside of the filter holder and surrounds the operation ring is formed in the filter holder main body.
It has a connecting gear that is arranged inside the filter holder main body and that rotates integrally with the rotation of the operation ring when the operation ring is rotated coaxially with the operation ring from the outside of the filter holder main body.
The connecting gear includes a connecting gear portion and a shaft portion.
Of the surfaces perpendicular to the optical axis of the recess, one surface has a shaft hole portion for inserting and supporting the shaft portion fitted to the operation ring.
The connecting gear shaft is provided with an O-ring.
On the other surface perpendicular to the optical axis of the recess, a screw coaxial with the operation ring and the shaft portion are fastened.
A plug-in filter holder having a filter gear that rotates the filter body by engaging with the connecting gear. It is characterized by having an idle gear which is arranged inside the filter holder main body, meshes with the connecting gear and the filter gear, and transmits power to the filter gear by driven rotation accompanying the rotation of the connecting gear. The plug-in filter holder according to claim 1.

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