JP2011141312A - Pluggable filter holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pluggable filter holder for obtaining a high dust-proof and drip-proof function, smoothly rotating a filter unit, simplifying a structure, and easily manufactured and assembled. <P>SOLUTION: The pluggable filter holder 1 has a holder body 10 detachably inserted into a lens barrel. In the pluggable filter holder 1, a rotation operation force applied to a rotatable and operable operation ring 20 from the outside of the holder body 10 is transmitted to the filter unit 80 disposed within the holder body 10 to rotate the filter unit 80. A recess 13 is formed in the holder body 10 and partitions the outside and the inside of the holder body 10. The operation ring 20 is disposed within the recess 13 outside the holder body 10. A coupling gear 30 is disposed within the holder 10 to be coaxial to the operation ring 20 and interlocks with and rotates the filter unit 80. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an insertion filter holder.

  Conventionally, a filter unit has a holder body that can be inserted into and removed from a lens barrel as an insertion filter holder, and a rotational operation force to an operation ring that can be rotated from the outside of the holder body is arranged inside the holder body. And a filter unit (for example, a CPL filter) is rotated.

  In such an insertion filter holder, as a dust-proof and drip-proof structure that prevents dust and water from entering the inside of the holder body from the outside, the holder body is formed with a recess that partitions the outside and the inside of the holder body. There has been known one in which an operation ring is disposed in a recess and a connection gear for transmitting the rotation of the operation ring to a filter unit is disposed in the holder body (Patent Document 1).

JP 2000-249888 A

  However, in this prior art, the gear portions respectively provided on the operation ring and the coupling gear mesh with each other in the concave portion outside the holder body (the meshing surface of the gear portion is exposed to the outside of the holder body). Therefore, dust and water may enter the inside of the holder main body from the outside through the meshing surfaces of these gear portions, and a sufficient dustproof and dripproof function is not obtained.

  In addition, if dust enters the meshing surfaces of the operation ring and the gear portion of the connecting gear, there is a risk that rotation will be defective and smooth rotation of the filter unit may be hindered.

  Furthermore, the operation ring and the connection gear must be provided with gear portions, respectively, and these must be meshed with each other. Since the operation ring and the connection gear must each be provided with a shaft member and inserted and supported in the holder body, the structure is complicated. Difficult to manufacture and assemble.

  The present invention has been made on the basis of the above awareness of the problem, and can obtain a high dustproof and drip-proof function, can smoothly rotate the filter unit, has a simple structure, and can be easily manufactured and assembled. It is an object to provide a built-in filter holder.

  According to the present invention, if the operation ring and the connection gear are coaxially arranged outside and inside the holder main body so as to be integrally rotatable, the operation ring and the connection gear are provided with respective gear portions, and these are provided in the recesses outside the holder main body. Since there is no need for meshing inside, dust and water do not enter the holder through the meshing surface of the gear part, and a high dustproof and drip-proof function can be obtained, and the filter unit can be smoothly moved without dust entering the meshing surface of the gear part. It was made based on the viewpoint that it can be rotated and that the structure can be simplified and the manufacture and assembly can be simplified.

  That is, the insertion filter holder of the present invention has a holder body that can be inserted into and removed from the lens barrel, and rotational operation force to the operation ring that can be rotated from the outside of the holder body is arranged inside the holder body. In the insertion filter holder that transmits to the filter unit and rotates the filter unit, the holder body is formed with a recess that partitions the outside and the inside of the holder body, and the recess is formed outside the holder body. An operation ring is disposed, and a connecting gear for interlockingly rotating the filter unit is disposed in the holder main body coaxially with the operation ring.

  The recess has a pair of partition walls parallel to each other, and at least one of the operation ring and the connecting gear has a non-circular shaft hole portion, and the pair of partition walls have a non-circular shaft hole portion of the operation ring. A shaft member having a non-circular step portion to be fitted and / or a non-circular step portion to be fitted to a non-circular shaft hole portion of the connecting gear can be inserted and supported. More specifically, among the operation ring and the connecting gear, when the shaft member first enters when assembled to the shaft member, a non-circular shaft hole portion may be provided and fitted to the non-circular step portion of the shaft member. .

  A non-circular shaft hole portion is provided in each (both) of the operation ring and the connection gear, the shaft member includes a non-circular step portion that fits in the non-circular shaft hole portion of the operation ring, and a non-circular shape of the connection gear. It is preferable to have a non-circular stepped portion that fits into the shaft hole.

  If the non-circular shaft hole portion of the operation ring and the corresponding non-circular step portion of the shaft member have a larger or smaller diameter than the non-circular shaft hole portion of the connection gear and the corresponding non-circular step portion of the shaft member (different) If the diameter is set), the operation ring and the connecting gear can be easily assembled to the shaft member.

  Of course, the non-circular shaft hole portion of the operation ring and the corresponding non-circular step portion of the shaft member may have substantially the same diameter as the non-circular shaft hole portion of the connection gear and the corresponding non-circular step portion of the shaft member. it can.

  If an O-ring is provided in the insertion part of the shaft member into the pair of partition walls, a higher dustproof and drip-proof effect can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, while obtaining a high dust-proof drip-proof function, a filter unit can be rotated smoothly, a structure is simple and an insertion filter holder with easy manufacture and assembly can be provided.

It is a disassembled perspective view of the insertion filter holder which concerns on one embodiment of this invention. FIG.

  1 and 2 show an insertion filter holder 1 according to an embodiment of the present invention. The insertion filter holder 1 has a holder body 10 that can be inserted into and removed from a notch S of a lens barrel L for a single-lens reflex camera indicated by a chain line in FIG. The holder body 10 includes a partially cylindrical exterior plate 11 along the outer peripheral surface of the lens barrel L, and an insertion plate portion 12 inserted into the lens barrel L. The insertion plate portion 12 includes a lens barrel. An opening (light beam transmission aperture) 12A through which the light beam passes when inserted into L is formed. A symbol O indicates the photographing optical axis of the lens barrel L (the center of the light beam transmission aperture 12A). Liquid tightness between the exterior plate 11 and the lens barrel L (notch S) is held by liquid tight means (not shown).

  The holder body 10 is formed with a recess 13 that opens to the exterior plate 11 and divides the outside of the holder body 10 (outside the holder) and the inside of the holder body 10 (inside the holder). The recess 13 has a pair of partition walls 14A and 14B parallel to each other perpendicular to the optical axis O, and a pair of through holes 15A and 15B parallel to the optical axis O are coaxially connected to the pair of partition walls 14A and 14B. Is formed.

  An operation ring 20 is disposed in the recess 13 outside the holder, and a drive gear (connection gear) 30 coaxial with the operation ring 20 is disposed in the holder defined by the recess 13. Each of the operation ring 20 and the drive gear 30 has a large-diameter oval shaft hole (large-diameter non-circular shaft hole) 21 and a small-diameter oval shaft hole (small-diameter non-circular shaft hole) 31. The shaft member 40 inserted through the pair of through holes 15A and 15B is coaxially supported.

  That is, the shaft member 40 includes a large-diameter oval step portion (large-diameter noncircular step portion) 41 that fits into the large-diameter oval shaft hole portion 21 of the operation ring 20 and a small-diameter oval shaft hole portion of the drive gear 30. A small-diameter oval step portion (small-diameter non-circular step portion) 42 that fits into the (small-diameter non-circular shaft hole portion) 31 is provided. The shaft member 40 also has an outer flange portion 40F located inside the holder of the partition wall 14A at one end portion, and a screw hole 43 in the shaft portion at the other end portion.

  In the pair of partition walls 14A and 14B, annular step portions 16A and 16B are coaxially formed at inner end portions of the pair of through holes 15A and 15B, and an O-ring (annular packing) 17A is formed on the annular step portions 16A and 16B. , 17B are provided.

  The shaft member 40 is inserted into a pair of through holes 15A and 15B (O-rings 17A and 17B), and the large-diameter oval step portion 41 and the small-diameter oval step portion 42 are respectively connected to the large-diameter oval shaft of the operation ring 20. A screw 44 is fastened to the screw hole 43 in a state where the hole 21 and the small diameter oval shaft hole 31 of the drive gear 30 are fitted. As a result, the axial direction (thrust direction) position and the rotational direction (radial direction) position of the operation ring 20 and the drive gear 30 are defined by the large-diameter flange portion 40F and the screw 44 positioned inside the partition walls 14A and 14B. At the same time, the gaps between the pair of through holes 15A and 15B and the shaft member 40 are sealed by the O-rings 17A and 17B, and the outside of the holder and the inside of the holder defined by the recess 13 are shut off in a liquid-tight manner. Therefore, when the operation ring 20 is rotated from the outside of the holder, the operation ring 20, the drive gear 30, and the shaft member 40 are integrally rotated.

  On the other hand, the insertion plate portion 12 supports an idle gear 50, a filter gear (subordinate gear) 60, a filter attachment ring 70, and a filter unit 80 that are located inside the holder (concave portion 13).

  The idle gear 50 has a gear portion 51 that simultaneously meshes with the gear portion 32 of the drive gear 30 and the gear portion 61 of the filter gear 60, and an inner peripheral surface 52 of the idle gear 50 can rotate on the circular shaft portion 18 of the insertion plate portion 12. The axial position and the rotational position are defined by fitting and tightening the screw 54 with a washer 53 interposed in the screw hole 18A of the circular shaft portion 18.

  The filter gear 60, the filter mounting ring 70, and the filter unit 80 are coaxially supported by the light beam transmission opening 12A of the insertion plate portion 12. On the inner peripheral surface 62 of the filter gear 60, an outer peripheral surface 71A of the fitting cylinder portion 71 of the filter mounting ring 70 is screwed and fixed so as not to be relatively rotatable. The unit 80 is screwed and fixed so as not to be relatively rotatable. Thereby, when the filter gear 60 rotates, the filter gear 60, the filter attachment ring 70, and the filter unit 80 rotate integrally. The filter mounting ring 70 has an optical axis orthogonal plane 72 in contact with an annular flange portion 12B formed around the light beam transmission opening 12A of the holder body 10, and the filter gear 60, the filter mounting ring 70, and the filter that rotate integrally with each other. The axial position of the unit 80 is defined (thrust regulation). The filter unit 80 holds a CPL filter (circular polarization filter) 81 that cuts unnecessary reflected light from the subject. The filter unit 80 can be attached to and detached from the filter mounting ring 70, and a desired filter unit 80 can be exchanged and used according to the photographing situation.

  When photographing is performed using the insertion filter holder 1 having the above configuration, first, a desired filter unit 80 corresponding to the photographing situation is screwed and fixed to the filter mounting ring 70, and the insertion filter holder 1 is attached to the lens barrel L. Is inserted into the notch S. In this insertion state, the center of the light beam transmission opening 12A of the insertion plate portion 12 coincides with the photographing optical axis O of the lens barrel L. Next, when the photographer rotates the operation ring 20 from the outside of the holder while looking through the viewfinder of the camera, the rotational operation force is sequentially transmitted from the shaft member 40 to the drive gear 30, the idle gear 50, and the filter gear 60, and the filter mounting ring. 70 and the filter unit 80 rotate integrally with the filter gear 60. When the filter unit 80 is thus rotated and the effect of the CPL filter 81 is adjusted, the photographer stops the rotation operation of the operation ring 20 and performs photographing.

  In the present embodiment, the holder body 10 is formed with a recess 13 that partitions the outside and the inside of the holder body 10, the operation ring 20 is disposed in the recess 13 outside the holder body 10, A drive gear (connection gear) 30 that rotates the filter unit 80 in conjunction with the operation ring 20 is disposed. Therefore, unlike the prior art described above, there is no need to provide gear portions for the operation ring and the connecting gear and to engage them in the recesses outside the holder body. High dust-proof and drip-proof function can be obtained without entering inside. Further, the gap between the shaft member 40 and the pair of through holes 15A and 15B is sealed by the O-rings 17A and 17B, and the outside and the inside of the holder body 10 partitioned by the recess 13 are liquid-tightly blocked. The drip-proof function is extremely high.

  Further, as in the prior art described above, dust does not enter the meshing surfaces of the gear portion of the operation ring and the connecting gear, causing trouble in rotation, and preventing smooth rotation of the filter unit. The rotating operation force is transmitted to the filter unit 80, and the filter unit 80 can be smoothly rotated.

  Further, the large-diameter oval mold step 41 of the shaft member 40 is fitted into the large-diameter oval shaft hole portion 21 of the operation ring 20, and the small-diameter oval shape of the shaft member 40 is inserted into the small-diameter oval shaft hole portion 31 of the drive gear 30. Since the step portion 42 is fitted and the shaft member 40 is only inserted and supported in the pair of parallel partitions 14A and 14B of the recess 13, the structure is simple and the manufacture and assembly are simple.

  Although not shown, if a hole communicating with the outside of the holder body 10 is formed at the bottom of the recess 13, water that cannot enter the inside of the holder body 10 and accumulates in the recess 13 can be quickly drawn out of the holder body 10. This is preferable.

  The large-diameter oval shaft hole 21, the small-diameter oval shaft hole 31, the large-diameter oval-shaped step 41 and the small-diameter oval-shaped step 42 are not limited to the oval shape, but may be other non-circular shapes. The operation ring 20, the drive gear 30, and the shaft member 40 can be rotated together with the rotation operation of the operation ring 20.

  There is a degree of freedom in the relationship between the diameters of the oval shaft hole 21 (oval step 41) and the oval shaft hole 31 (oval step 42), and the oval shaft hole 21 (oval step). 41) may be smaller than the oval shaft hole 31 (oval step 42), or both may be substantially the same diameter.

  Alternatively, the idle gear 50 may be omitted and the drive gear 30 may be directly meshed with the filter gear 60.

DESCRIPTION OF SYMBOLS 1 Plug filter holder 10 Holder main body 11 Exterior plate 12 Insertion plate part 12A Light beam transmission opening 12B Annular flange part 13 Recessed part 14A, 14B A pair of partition walls 15A, 15B A pair of through holes 16A, 16B Annular step part 17A, 17B O-ring ( Annular packing)
18 Circular shaft portion 18A Screw hole 20 Operation ring 21 Large diameter oval type shaft hole portion (Large diameter non-circular shaft hole portion)
30 Drive gear (connection gear)
31 Small-diameter oval shaft hole (small-diameter non-circular shaft hole)
32 Gear portion 40 Shaft member 40F Outer flange 41 Large diameter oval step (large diameter non-circular step)
42 Small diameter oval type step (small diameter non-circular step)
43 Screw hole 44 Screw 50 Idle gear 51 Gear portion 52 Inner peripheral surface 53 Washer 54 Screw 60 Filter gear (subordinate gear)
61 Gear portion 62 Inner peripheral surface 70 Filter mounting ring 71 Fitting cylinder portion 71A Outer peripheral surface 71B Inner peripheral surface 72 Optical axis orthogonal surface 80 Filter unit 81 CPL filter (circular polarization filter)
L Lens barrel S Notch

Claims (6)

A holder body that can be inserted into and removed from the lens barrel, and transmitting a rotational operation force to an operation ring that can be rotated from the outside of the holder body to a filter unit disposed inside the holder body to In the rotating filter holder to rotate,
Forming a recess for partitioning the outside and inside of the holder body in the holder body;
Placing the operation ring in the recess outside the holder body;
A plug-in filter holder, wherein a coupling gear for interlocking rotation of the filter unit is arranged in the holder main body coaxially with the operation ring. The insertion filter holder according to claim 1,
The concave portion has a pair of partition walls parallel to each other,
At least one of the operation ring and the connection gear has a non-circular shaft hole,
A shaft member having a non-circular step portion that fits into a non-circular shaft hole portion of the operation ring and / or a non-circular step portion that fits into a non-circular shaft hole portion of the connection gear is inserted into the pair of partition walls. Supported insertion filter holder. The insertion filter holder according to claim 2,
Each of the operation ring and the connection gear has a non-circular shaft hole,
The shaft member is an insertion filter holder having a non-circular step portion that fits into a non-circular shaft hole portion of the operation ring and a non-circular step portion that fits into a non-circular shaft hole portion of the connection gear. The insertion filter holder according to claim 3,
An insertion filter in which the non-circular shaft hole portion of the operation ring and the corresponding non-circular step portion of the shaft member are larger or smaller in diameter than the non-circular shaft hole portion of the connection gear and the corresponding non-circular step portion of the shaft member. holder. The insertion filter holder according to claim 3,
The non-circular shaft hole portion of the operation ring and the corresponding non-circular step portion of the shaft member have substantially the same diameter as the non-circular shaft hole portion of the connection gear and the corresponding non-circular step portion of the shaft member. . In the insertion filter holder according to any one of claims 1 to 5,
An insertion filter holder in which an O-ring is provided at an insertion portion of the shaft member into the pair of partition walls.

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