JP5696375B2 - Lens barrel and photographing apparatus - Google Patents

Description

  The present invention relates to a lens barrel and a photographing apparatus.

  When the inside of the lens barrel is sealed with respect to the outside and the lens barrel is taken out from a warm room to a low temperature outside, for example, condensation may occur on the lens. For this reason, a thin wall portion is provided on the lens barrel wall of the lens barrel so that the thin wall portion is lowered to the same temperature as the outside prior to the lens portion, and condensation occurs on the thin wall portion to cause condensation on the lens. There is a lens barrel that prevents the lens from being generated (for example, see Patent Document 1).

JP 2000-194048 A

  However, when the temperature difference is large, there is a case where condensation cannot be completely eliminated even if the thin portion is provided as in the above-described conventional technology. If condensation forms on the lens, it may cause a malfunction. Further, if the inside of the lens barrel is sealed with respect to the outside, there is a problem that when the lens barrel expands and contracts, it is difficult to operate due to a change in atmospheric pressure.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel and a photographing apparatus with good operability.

The present invention solves the above problems by the following means.
The invention according to claim 1 is a first protrusion provided on the inner surface side, a second protrusion provided on the inner surface side spaced from the first protrusion in the optical axis direction, the first protrusion, and the A fixed cylinder having a recess provided between the second protrusion and an inner surface side portion provided on the inner surface side of the fixed cylinder, and held in the fixed cylinder so as to be rotatable relative to the fixed cylinder. A rotating cylinder, an inner cylinder provided on an inner surface side of the fixed cylinder, an outer surface side of the inner cylinder, and an inner surface side of the rotating cylinder, and light according to relative rotation of the rotating cylinder. A rectilinear cylinder that is relatively movable in the axial direction, and the inner surface side portion is guided by the first protrusion and the second protrusion and moves in the recess in the circumferential direction of the cylinder. And a plurality of third projections provided at intervals, and a portion where the third projections are not provided in the circumferential direction. The first protrusion has a notch formed in a portion corresponding to the through hole in the circumferential direction, and the through hole is formed on the outer surface side of the inner cylinder and the rotation. It is a lens barrel characterized in that it communicates with a space between the inner surface side of the tube and the volume of which varies according to the relative movement of the rectilinear tube.
A second aspect of the present invention is the lens barrel according to the first aspect, wherein the through holes and the third protrusions are provided alternately in the circumferential direction. .
According to a third aspect of the present invention, in the lens barrel according to the first or second aspect, the through hole and the notch portion extend in a circumferential direction, and the entire movement range of the rotating cylinder relative to the fixed cylinder is At least a part of the through hole and the notch is adjacent to each other.
According to a fourth aspect of the present invention, in the lens barrel according to any one of the first to third aspects, an external space and the notch are provided between the fixed barrel and the rotary barrel. The lens barrel is characterized in that a communicating gap D2 is provided.
According to a fifth aspect of the present invention, in the lens barrel according to any one of the first to fourth aspects, a waterproof and breathable member is disposed on the inner peripheral side of the through hole. It is a lens barrel characterized by the above.
A sixth aspect of the present invention is the lens barrel according to any one of the first to fifth aspects, wherein the rotating barrel is a zoom operation ring or a focus operation ring. It is a cylinder.
The invention according to claim 7 is a first protrusion provided on the outer surface side, a second protrusion provided on the outer surface side spaced from the first protrusion in the optical axis direction, the first protrusion, A fixed cylinder having a recess provided between the second protrusion and an outer surface side portion provided on an outer surface side of the fixed cylinder, and held in the fixed cylinder so as to be relatively rotatable with respect to the fixed cylinder. A rotating cylinder, an inner cylinder provided on an inner surface side of the fixed cylinder, an outer surface side of the inner cylinder, and an inner surface side of the rotating cylinder, and light according to relative rotation of the rotating cylinder. A rectilinear cylinder that is relatively movable in the axial direction, and the outer surface side portion is guided by the first protrusion and the second protrusion and moves in the recess in the circumferential direction of the cylinder. And a plurality of third projections provided at intervals, and a portion where the third projections are not provided in the circumferential direction. The first protrusion has a notch formed in a portion corresponding to the through hole in the circumferential direction, and the through hole is formed on the outer surface side of the inner cylinder and the rotation. It is a lens barrel characterized in that it communicates with a space between the inner surface side of the tube and the volume of which varies according to the relative movement of the rectilinear tube.
The invention according to claim 8 includes a plurality of first protrusions provided on the inner surface side at intervals in the circumferential direction, and through holes provided in a portion where the first protrusions are not provided in the circumferential direction. A fixed cylinder having an inner surface side portion provided on the inner surface side of the fixed cylinder, a rotary cylinder held by the fixed cylinder so as to be relatively rotatable with respect to the fixed cylinder, and an inner surface side of the fixed cylinder An inner cylinder provided, and a rectilinear cylinder that is provided between an outer surface side of the inner cylinder and an inner surface side of the rotating cylinder and is relatively movable in the optical axis direction according to relative rotation of the rotating cylinder. The inner surface portion includes a second protrusion provided on the outer surface side, a third protrusion provided on the outer surface side spaced from the second protrusion in the optical axis direction, the second protrusion, and the third protrusion. And the second protrusion corresponds to the through hole in the circumferential direction. The through hole is a space between the outer surface side of the inner cylinder and the inner surface side of the rotating cylinder, and the volume of which changes in accordance with the relative movement of the rectilinear cylinder. The lens barrel is characterized in that it is in fluid communication with the lens barrel.
The invention according to claim 9, a first protrusion provided more on the outer surface side at a interval in the circumferential direction, a through hole into which the first protrusion in the circumferential direction is provided in a portion not provided A fixed cylinder having an inner surface side portion provided on an inner surface side of the fixed cylinder, and being held by the fixed cylinder so as to be relatively rotatable with respect to the fixed cylinder, and an inner surface side of the fixed cylinder An inner cylinder provided on the inner cylinder, and a rectilinear cylinder that is provided between an outer surface side of the inner cylinder and an inner surface side of the rotary cylinder, and is relatively movable in the optical axis direction according to relative rotation of the rotary cylinder. The inner surface side portion includes a second protrusion provided on the inner surface side, a third protrusion provided on the inner surface side spaced from the second protrusion in the optical axis direction, the second protrusion, and the second protrusion. 3 and a recess provided between the protrusions, the second protrusions, corresponding to the through hole in the circumferential direction The through hole is a space between the outer surface side of the inner cylinder and the inner surface side of the rotating cylinder, and the volume of which changes in accordance with the relative movement of the rectilinear cylinder. The lens barrel is characterized in that it is in fluid communication with the lens barrel.
A tenth aspect of the present invention is an imaging apparatus including the lens barrel according to any one of the first to ninth aspects.

  Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component. Moreover, the notch part being formed in the part corresponding to the through hole in the circumferential direction means, for example, that at least a part of the through hole in the circumferential direction is at a position overlapping the notch part.

  According to the present invention, it is possible to provide a lens barrel and a photographing apparatus with good operability.

It is a conceptual diagram of a camera provided with a lens barrel in a wide-angle state that is an embodiment of the present invention. It is sectional drawing in the telephoto state of a lens-barrel. It is sectional drawing of the connection part in the surface orthogonal to the optical axis equivalent to the AA cross section of FIG. It is sectional drawing of the connection part in the surface orthogonal to the optical axis equivalent to the BB cross section of FIG. It is sectional drawing corresponding to FIG. 3 explaining the assembly process of the connection part. FIGS. 4A and 4B are views corresponding to FIG. 3 in which the connecting portion is exploded, in which FIG. 3A is a cross-sectional view of the fitting recess of the fixed cylinder, and FIG. The expanded sectional view in the surface containing the optical axis of a connection part is shown, (a) is CC cross section of FIG. 3, (b) is DD cross section of FIG. 3, (c) is EE cross section of FIG. Correspond to each. Sectional drawing which expand | deployed the connection part in the circumferential direction is shown, (a) respond | corresponds to the FF cross section of FIG. 3, (b) respectively corresponds to the GG cross section of FIG. It is a figure for demonstrating a connection part. It is a figure corresponding to FIG. 9 which shows the modification of this invention. It is a figure corresponding to FIG. 9 which shows the modification of this invention. It is a figure corresponding to FIG. 9 which shows the modification of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram of a camera 1 including a lens barrel 10 in a wide angle state according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the lens barrel 10 in the telephoto state.

  1 and 2 and the drawings described below are provided with an XYZ orthogonal coordinate system for easy explanation and understanding. In this coordinate system, when the photographer shoots a horizontally long image with the optical axis OA being horizontal, the direction toward the left side as viewed from the photographer at the position of the camera 1 (hereinafter referred to as a positive position) is the X axis plus direction, A direction toward the upper side at the position is a Y-axis plus direction, and a direction toward the subject at the positive position is a Z-axis plus direction. In the following description, the direction parallel to the optical axis OA is referred to as “front-rear”, the subject side is referred to as “front side”, and the other end side is referred to as “back side”.

  The camera 1 is a digital camera including a camera body 2 and a lens barrel 10 that is detachably coupled to the camera body 2 via a mount unit 3. The present invention is not limited to a digital camera, and can be applied to, for example, a still camera using a film.

The camera body 2 includes an image sensor 21 that converts an optical subject image into an electrical signal.
Although described later in detail, the lens barrel 10 includes four lens groups (L1, L2, L3, and L4) that form an imaging optical system, and uses the incident subject light as the imaging element 21 of the camera body 2. To form an image.
The camera 1 having the above configuration converts the subject light image formed by the lens barrel 10 into an electrical signal by the image pickup device 21 and records it as image information in a memory (not shown) provided in the camera body 2.

Next, the lens barrel 10 according to the present embodiment will be described.
The lens barrel 10 is a so-called zoom lens that can change the combined focal length of the optical system. FIG. 1 shows a state in which the focal length of the lens barrel 10 is the shortest (hereinafter referred to as a wide angle state). FIG. 2 shows a state in which the focal length of the lens barrel 10 is the longest (telephoto state).

  The lens barrel 10 includes four lens groups of a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L4. These lens groups L1 to L4 are arranged in order from the front side to the back side. The first lens unit L1 is supported by an end portion on the front side of a rectilinear cylinder 13 to be described later. The second lens group L2, the third lens group L3, and the fourth lens group L4 are fixed to the second lens holding frame F2, the third lens holding frame F3, and the fourth lens holding frame F4, respectively.

The lens barrel 10 includes an inner cylinder 11, a cam cylinder 12, a rectilinear cylinder 13, a fixed cylinder 14, and a rotating cylinder 15. Each of these members is formed in a cylindrical shape.
The fixed cylinder 14 and the inner cylinder 11 positioned inside the fixed cylinder 14 are coupled to each other at a base end portion (end on the back side) to form a base portion of the lens barrel 10 and hold other components. A lens mount 31 coupled to the camera body 2 is provided on the rear side end face of the fixed cylinder 14.
The fixed tube 14 and the rotating tube 15 are connected to the front surface side of the fixed tube 14 so as to be relatively rotatable via a connecting part 100, and form the outer shape of the lens barrel 10 together.

  The inner cylinder 11 is located concentrically inside the fixed cylinder 14 and the rotating cylinder 15 and is fixed to the fixed cylinder 14 at the end on the back side as described above. The inner cylinder 11 includes a large-diameter portion 11A on the front side (Z-axis plus side) and a small-diameter portion 11B on the back side (Z-axis minus side), and holds the cam cylinder 12 on the inner peripheral side of the large-diameter portion 11A. The third lens unit L3 and the fourth lens unit L4 are held on the inner peripheral side of the small diameter portion 11B.

  A straight cam groove (not shown) is provided in the large diameter portion 11A of the inner cylinder 11 along the direction of the optical axis OA. The rectilinear cam groove is provided over the range of movement of the second lens holding frame F2 in the optical axis OA direction. Further, a lead cam groove (not shown) is provided in the large diameter portion 11A of the inner cylinder 11 along a direction intersecting the optical axis OA direction. The lead cam groove is provided corresponding to the movement range of the rectilinear cylinder 13 in the optical axis OA direction.

The cam cylinder 12 is fitted to the inner periphery of the large diameter portion 11A of the inner cylinder 11 so as to be slidable and rotatable.
The cam cylinder 12 is provided with a lead cam groove (not shown) along the direction intersecting the optical axis OA corresponding to the rectilinear groove of the inner cylinder 11.
The cam cylinder 12 holds the second lens holding frame F2 (second lens group L2) on the inner peripheral side thereof so as to be slidable.

  A follower pin (not shown) is provided on the outer peripheral surface of the second lens holding frame F2 so as to protrude in a direction intersecting the optical axis OA direction. The follower pin passes through the lead cam groove of the cam cylinder 12 and engages with the rectilinear cam groove of the inner cylinder 11. Accordingly, the second lens holding frame F2 is driven to move in the direction of the optical axis OA along the straight cam groove by the rotation of the cam cylinder 12.

The rectilinear cylinder 13 holds the first lens unit L1 on the inner peripheral side of the front side end. The rectilinear cylinder 13 is fitted to the outer periphery of the large diameter portion 11A of the inner cylinder 11 so as to be slidable.
On the inner peripheral surface of the rectilinear cylinder 13, a first fixing pin (not shown) projects in the radial direction. The first fixing pin is engaged with a lead cam groove provided in the inner cylinder 11. Further, a second fixing pin (not shown) protrudes radially from the outer peripheral surface of the rectilinear cylinder 13. The second fixing pin is engaged with a straight groove (not shown) provided on the inner peripheral surface of the rotary cylinder 15.

As described above, the fixed cylinder 14 has the inner cylinder 11 fixed to the end portion on the back side thereof, and holds the cam cylinder 12 rotatably in the circumferential direction via the inner cylinder 11, and the rectilinear cylinder 13. Is movably held in the direction of the optical axis OA.
An annular rotation operation portion (not shown) is provided on the outer peripheral side of the fixed cylinder 14 so as to be rotatable in the circumferential direction with respect to the fixed cylinder 14. The rotation operation unit engages with the cam cylinder 12 at an engagement part (not shown), and can rotate integrally with the cam cylinder 12.

As described above, the rotary cylinder 15 is connected to the front surface side of the fixed cylinder 14 via the connecting portion 100. The rotary cylinder 15 is a zoom operation ring for performing a zoom operation.
The connecting portion 100 has an engagement claw of a predetermined angle in the circumferential direction formed on the outer periphery of the end portion on the back surface side of the rotary cylinder 15 in the circumferential engagement groove 141 formed on the inner periphery of the front end portion of the fixed cylinder 14. The portion 151 is slidably fitted and is so-called bayonet-coupled. Thereby, the rotary cylinder 15 and the fixed cylinder 14 are connected to the fixed cylinder 14 so that the rotary cylinder 15 cannot move in the direction of the optical axis OA and can be relatively rotated. The connecting portion 100 will be described in detail later.

  A rectilinear groove (not shown) is provided on the inner peripheral surface of the rotating cylinder 15 so that a second fixing pin projecting from the outer periphery of the rectilinear cylinder 13 is slidably fitted therein. The rectilinear groove is provided along the optical axis OA direction corresponding to the movement range of the rectilinear cylinder 13 in the optical axis OA direction.

A sealing member 16 is provided between the inner peripheral surface on the front surface side of the rotary cylinder 15 and the outer peripheral surface of the rectilinear cylinder 13.
The sealing member 16 is a cylindrical member, is fixed to the inner peripheral surface of the rotating cylinder 15, and is slidable with the outer peripheral surface of the rectilinear cylinder 13. The sealing member 16 seals the gap between the rotary cylinder 15 and the rectilinear cylinder 13, thereby preventing dust, moisture, and the like from entering the lens barrel 10 from the outside.

The lens barrel 10 configured as described above operates as follows.
In the wide-angle state shown in FIG. 1, the rotating cylinder 15 is rotated in one circumferential direction (counterclockwise as viewed from the back side) with respect to the fixed cylinder 14. As a result, the rectilinear cylinder 13 having the second fixing pin that engages with the rectilinear groove on the inner peripheral surface of the rotating cylinder 15 rotates in the circumferential direction integrally with the rotating cylinder 15, and in the circumferential direction with respect to the inner cylinder 11. Rotate. When the rectilinear cylinder 13 rotates in the circumferential direction with respect to the inner cylinder 11, the first fixing pin protruding from the inner peripheral surface of the rectilinear cylinder 13 moves along the lead cam groove provided in the inner cylinder 11. Further, the second fixing pin protruding from the outer peripheral surface of the rectilinear cylinder 13 moves along the rectilinear cam groove provided on the inner peripheral surface of the rotary cylinder 15.

  As a result, the rectilinear barrel 13 (first lens unit L1) moves in the front side along the optical axis OA direction while rotating in the circumferential direction together with the rotating barrel 15, and the lens barrel 10 is in the telephoto state shown in FIG. It becomes. When the rotating cylinder 15 is rotated in the reverse direction from the telephoto state shown in FIG. 2, the rectilinear cylinder 13 moves to the back side along the optical axis OA direction while rotating integrally with the rotating cylinder 15 in the circumferential direction. Then, the wide angle state shown in FIG. 1 is obtained. The total length of the lens barrel 10 in the direction of the optical axis OA changes with the movement of the rectilinear barrel 13 (first lens unit L1) by the zoom operation, and is short in the wide angle state and long in the telephoto state.

  Further, when a rotation operation section (not shown) provided on the outer peripheral side of the fixed cylinder 14 is rotated in the circumferential direction with respect to the fixed cylinder 14, the cam cylinder 12 rotates integrally with the rotation operation section, and the cam cylinder 12 It rotates in the circumferential direction with respect to the cylinder 11. As a result, the follower pin provided in the second lens holding frame F <b> 2 moves along the rectilinear groove of the inner cylinder 11 and the lead cam groove of the cam cylinder 12. Accordingly, the second lens holding frame F2 (second lens group L2) moves along the optical axis OA direction.

Next, with reference to FIGS. 3 to 9 in addition to FIGS. 1 and 2 described above, the connecting portion 100 that connects the fixed cylinder 14 and the rotating cylinder 15 will be described in detail.
FIG. 3 is a cross-sectional view of the connecting portion 100 in a plane orthogonal to the optical axis OA corresponding to the AA cross section of FIG. 4 is a cross-sectional view of the connecting portion 100 on a plane orthogonal to the optical axis OA corresponding to the BB cross section of FIG. FIG. 5 is a cross-sectional view corresponding to FIG. 3 for explaining the assembly process of the connecting portion 100 (assembly of the rotating cylinder 15 to the fixed cylinder 14). 6A and 6B are diagrams corresponding to FIG. 3 showing the disassembled connecting portion 100, where FIG. 6A is a sectional view of the outer fitting portion 140 of the fixed cylinder 14, and FIG. FIG. 7A and 7B are enlarged cross-sectional views of a plane including the optical axis OA of the connecting portion 100, where FIG. 7A is a CC cross section of FIG. 3, FIG. 7B is a DD cross section of FIG. 3 respectively correspond to the EE cross section. 8A and 8B are cross-sectional views in which the connecting portion 100 is developed in the circumferential direction, where FIG. 8A corresponds to the FF cross section in FIG. 3, and FIG. 8B corresponds to the GG cross section in FIG. FIG. 9 is a view for explaining the connecting portion 100, and is a perspective view taken along the line EE of FIG. In addition, FIG.8 (b) is the figure seen from the FF direction of FIG. 3 to 5, the structure inside the connecting portion 100 is omitted in order to avoid complexity.

  In the connecting portion 100, the inner fitting portion 150 formed at the rear side end portion of the rotating tube 15 is fitted to the outer fitting portion 140 formed at the front side end portion of the fixed cylinder 14, and the outer fitting portion is formed. The engaging groove 141 formed on the outer periphery of the outer fitting portion 140 is fitted into the engaging groove 141 formed on the inner periphery of 140.

The outer fitting portion 140 of the fixed cylinder 14 is formed with a predetermined length in the direction of the optical axis OA, with the inner diameter of the front-side opening end of the fixed cylinder 14 being increased.
The outer fitting portion 140 includes an engagement groove 141, a notch portion 142, and an engagement claw portion 143 on the inner peripheral surface thereof.
The engagement groove 141 has a rectangular cross-sectional shape having a predetermined width in the optical axis OA direction and a predetermined depth in the radial direction, and is continuous from the front end surface of the fixed cylinder 14 to the back surface side by a predetermined amount along the circumferential direction. Is formed.

A portion of the outer fitting portion 140 on the back side of the engagement groove 141 is a fitting step portion 144, and an engagement claw portion 143 on the front side (open side) of the engagement groove 141 is a fitting step portion 144. The diameter is larger.
The notch 142 is formed by cutting an engagement claw 143 on the front side of the engagement groove 141 within a predetermined angle range. The angular range of the notch 142 is set to be larger than the engagement claw 151 so that an engagement claw 151 in the inner fitting part 150 described later can be fitted in the optical axis OA direction. The bottom surface of the notch 142 coincides with the bottom surface of the engagement groove 141. The notches 142 are formed at three locations at equal angular intervals (that is, at intervals of 120 °) in the circumferential direction, corresponding to the engaging claws 151 in the inner fitting portion 150 described later.
The engaging claw 143 is divided by the notch 142 and is provided on the front side from the engaging groove 141. That is, the engagement claw part 143 is formed in a predetermined angle range at three locations in the circumferential direction.

  The inner fitting portion 150 in the rotary cylinder 15 is provided at the rear side end of the rotary cylinder 15. The outer diameter of the inner fitting part 150 is smaller than the outer diameter of the rotary cylinder 15 and is set so as to be rotatably fitted to the fitting step part 144 of the outer fitting part 140 in the fixed cylinder 14.

The inner fitting portion 150 includes an engagement claw portion 151 and a through hole 152.
The engaging claws 151 are provided on the outer periphery of the inner fitting portion 150 at a predetermined angular range in the circumferential direction, and are provided at three positions at equal angular intervals (that is, at 120 ° intervals) in the circumferential direction. The cross-sectional shape of the engaging claw portion 151 is a rectangle in which the optical axis OA direction is slidably fitted in the engaging groove 141 of the outer fitting portion 140, and the height in the radial direction is the engaging groove 141. It is set smaller than the depth.

The through-hole 152 is formed in an intermediate portion at the position where the three engaging claws 151 are disposed so as to communicate with the inside and outside of the inner fitting portion 150 in a predetermined angular range in the circumferential direction.
The position of the through hole 152 in the direction of the optical axis OA corresponds to the engagement groove 141 of the outer fitting portion 140 in the fixed cylinder 14 and is formed wider than the engagement groove 141 by a predetermined amount. That is, as shown in FIGS. 7A and 7B, the edge on the back side of the through hole 152 is located on the back side from the edge on the back side of the engagement groove 141, and the edge on the front side of the through hole 152. Is positioned on the front side from the front side edge of the engagement groove 141.

In addition, on the inner peripheral side of the through-hole 152, a sheet mounting recess 153 that is slightly larger than the through-hole 152 in the optical axis OA direction and the circumferential direction is formed with a predetermined depth in the radial direction. The waterproof ventilation sheet 101 is attached to the sheet mounting recess 153.
The waterproof breathable sheet 101 is formed of a waterproof and breathable member that does not allow water droplets, dust, or the like to pass therethrough and allows gas flow. The waterproof breathable sheet 101 is fixed to the sheet mounting recess 153 at the peripheral edge thereof, for example, with an adhesive or the like, and is disposed on the inner peripheral side of the through hole 152 so as to cover the entire area.

  The connecting portion 100 configured as described above is configured such that the front end (the back side end portion) of the inner fitting portion 150 is fitted to the fitting step portion 144 of the outer fitting portion 140 so as to be slidable and rotatable. The engaging claw 151 of the inner fitting portion 150 is fitted into the engaging groove 141 of the outer fitting portion 140, and the outer fitting portion 140 (fixed cylinder 14) and the inner fitting portion 150 (rotating cylinder 15) Are connected so as to be relatively rotatable. By fitting the inner fitting part 150 to the fitting step part 144, the inclination of the inner fitting part 150 (rotating cylinder 15) with respect to the outer fitting part 140 (fixed cylinder 14) (that is, the inclination with respect to the optical axis OA). It is preventing.

  In a state where the connecting portion 100 connects the fixed cylinder 14 (outer fitting portion 140) and the rotating cylinder 15 (inner fitting portion 150), as shown in FIG. A gap D <b> 1 is formed between the inner peripheral surface of 143 and the outer peripheral surface of the inner fitting portion 150. Further, a gap D <b> 2 is formed between the front end surface of the fixed cylinder 14 and the stepped surface (surface toward the back side) between the outer periphery of the rotating cylinder 15 and the inner fitting portion 150.

  As a result, at a position corresponding to the through hole 152 shown in FIG. 7A, the engagement groove 141 communicates with the outside through the notch 142 and the gap D2 so as to allow air to flow as shown by arrows in the figure. To do. 7B, the engagement groove 141 communicates with the outside through the gap D1 and the gap D2 so that air can flow through the engagement groove 141. .

The assembly of the connecting portion 100 having the above configuration (the coupling of the rotating cylinder 15 to the fixed cylinder 14) is performed as follows.
That is, as shown in FIG. 5, the engagement claw 151 of the inner fitting portion 150 in the rotating cylinder 15 is matched with the notch 142 of the outer fitting portion 140 in the fixed cylinder 14 to The fitting portion 150 is fitted into the outer fitting portion 140 of the fixed cylinder 14. Then, with the end surface on the back side of the engaging claw portion 151 in contact with the surface on the back side of the engaging groove 141 of the outer fitting portion 140, the rotating cylinder 15 is turned away as indicated by an arrow R in FIG. Rotate clockwise. As a result, as shown in FIG. 3, the engaging claw portion 151 is moved to the region where the engaging claw portion 143 is formed, and the engaging claw portion 151 is fitted into the engaging groove 141 of the outer fitting portion 140 (engaging claw). The portion 151 is engaged with the engaging claw portion 143.

Here, the position of the engaging claw 151 (rotary cylinder 15) in the circumferential direction with respect to the engaging claw 143 (fixed cylinder 14) during the zoom operation from the wide-angle side end to the telephoto side end of the lens barrel 10. The rotation angle is set as follows.
That is, in the wide angle state, as shown in FIG. 3, the engagement claw portion 151 of the inner fitting portion 150 is moved from the wide angle side of the rotating cylinder 15 to the telephoto side of the engagement claw portion 143 of the outer fitting portion 140. It is located downstream in the rotational direction (direction indicated by arrow R in FIG. 3). In the telephoto state, the engaging claw portion 151 moves to the upstream side of the engaging claw portion 143. That is, during the zoom operation, the engaging claw portion 151 moves within the range of the forming angle of the engaging claw portion 143, and does not become a position where the engaging claw portion 151 is released (a position corresponding to the notch portion 142). ing.

  Further, the formation range in the circumferential direction of the through-hole 152 is such that, in the wide-angle state shown in FIGS. 3 and 8A, the upstream side in the rotation direction to the telephoto side (the direction indicated by the arrow R in FIG. In the telephoto state shown in FIG. 4 and FIG. 8B, the downstream side is set to overlap with the notch 142 in the predetermined angle range θ2. That is, the entire notch 142 overlaps with the through-hole 152 between the wide-angle state and the telephoto state, and even if the inner fitting portion 150 rotates to either the wide-angle side or the telephoto side from this state, the through-hole 152 And the notch 142 are set so as to maintain a predetermined angle range.

With such a configuration, the region where the through hole 152 and the notch 142 overlap is always formed at three places in the circumferential direction in the entire zoom operation range. In the region where the through hole 152 and the notch 142 overlap in this way, the inner peripheral side of the rotary cylinder 15 and the lens barrel as shown by the arrows in FIG. 7A and FIG. 10 communicates with the outside through the through hole 152, the notch 142, and the gap D2.
Thereby, in the entire zoom range from the wide-angle state to the telephoto state, the inner peripheral side of the rotary cylinder 15 and the outside of the lens barrel 10 communicate with each other through the through-hole 152, the notch 142, and the gap D2. To do.

  7B, the engagement groove 141 can be ventilated with the inner peripheral side of the rotary cylinder 15 through the through hole 152 in a portion where the engagement claw portion 151 is not engaged with the engagement groove 141. Communicate. As described above, the engagement groove 141 communicates with the outside through the gap D1 and the gap D2 so that air can flow. As a result, the inner peripheral side of the rotary cylinder 15 and the outside of the lens barrel 10 communicate with each other so as to allow ventilation.

  The connecting part 100 configured as described above allows air to smoothly flow between the inside and the outside of the lens barrel 10 during the zoom operation of the lens barrel 10, so that the internal pressure inside and outside the lens barrel 10 can be reduced. The difference can be resolved quickly.

  That is, when the focal length is changed from the wide-angle state shown in FIG. 1 to the telephoto state shown in FIG. 2 by the rotation operation of the rotary cylinder 15, the first lens group L1 and the second lens group held in the rectilinear cylinder 3 L2 separates and the volume of space S1 between both increases. When the volume of the space S1 increases, the internal pressure decreases. Therefore, from the space S2 between the inner cylinder 11 and the rotating cylinder 15 to the space S1, the straight cam groove and the lead cam groove of the inner cylinder 11, and the lead cam groove of the cam cylinder 12 And air flows in through a gap between the inner cylinder 11 and the straight cylinder 13 or the like. At this time, the connecting part 100 allows air to smoothly flow into the space S <b> 2 through the gap D <b> 2, the notch part 142, and the through hole 152.

  On the other hand, when the focal length is changed from the telephoto state shown in FIG. 2 to the wide-angle state shown in FIG. 1 by the rotation operation of the rotary cylinder 15, the first lens group L1 and the second lens group held by the rectilinear cylinder 3 are used. L2 approaches and the volume of space S1 between both decreases. When the volume of the space S1 decreases, its internal pressure increases. From the space S1 to the space S2 between the inner cylinder 11 and the rotating cylinder 15, the straight cam groove and the lead cam groove of the inner cylinder 11, the lead cam groove of the cam cylinder 12, and Air flows out through a gap between the inner cylinder 11 and the straight cylinder 13. At this time, the connecting part 100 smoothly discharges air from the space S2 through the through hole 152, the notch part 142, and the gap D2.

The notch 142 through which air flows has a large opening in the radial direction so that the engaging claw 151 can be inserted, and air can be circulated quickly with less flow resistance. Further, the waterproof ventilation sheet 101 disposed on the inner peripheral side of the through hole 152 prevents water droplets and dust from entering the lens barrel 10.
Thereby, the resistance of the zoom operation due to the pressure difference between the inside and outside of the lens barrel 10 during the zoom operation can be suppressed, and a smooth zoom operation can be performed.

  Note that the air flow between the space S2 and the outside through the space between the rotary cylinder 15 and the rectilinear cylinder 13 is blocked by the sealing member 16, and the back side of the fixed cylinder 14 is closed. For this reason, when the circulation of air is not performed by the connecting part 100, the pressure change accompanying the volume change of the space S1 between the first lens unit L1 and the second lens unit L2 acts as a resistance and is smooth. This will hinder the zoom operation.

As described above, this embodiment has the following effects.
(1) The lens barrel 10 is provided with a through hole 152 and a notch 142 that communicate with the inside and outside of the connecting portion 100 that connects the fixed barrel 14 and the rotating barrel 15. Thereby, air can be smoothly circulated inside and outside the lens barrel 10 through the through hole 152 and the notch 142 in the connecting portion 100.
That is, since the notch 142 is formed in a portion corresponding to the through hole 152 in the circumferential direction, gas can escape from the through hole 152 to the notch 142.
As a result, it is possible to reduce the resistance of the zoom operation due to the pressure difference between the inside and outside of the lens barrel 10 caused by the movement of the first lens unit L1 during the zoom operation, and a smooth zoom operation becomes possible.

(2) The connection part 100 uses the notch part 142 opened largely in a radial direction as an air flow path. For this reason, air can be made to flow quickly with little resistance, and a smooth zoom operation becomes possible.

(3) Since the connecting portion 100 includes the waterproof ventilation sheet 101 on the inner peripheral side of the through hole 152 in the inner fitting portion 150, water droplets, dust and the like enter the inside of the lens barrel 10 together with the inflow of air. Can be prevented.

(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) In the present embodiment, the configuration in which the fixed cylinder 14 is the outer side and the rotary cylinder 15 is the inner side has been described, but the present invention is not limited to this. As shown in FIG. 10, the fixed cylinder 14a may be on the inner side and the rotary cylinder 15a may be on the outer side.
That is, the engaging claw 143a provided on the outer surface side, the fitting step 144a provided on the outer surface side spaced from the engaging claw 143a in the optical axis direction, and the engaging claw 143a are fitted. It has a fixed cylinder 14a having an engaging groove 141a provided between the stepped part 144a and an outer surface side portion 15A provided on the outer surface side of the fixed cylinder 14a, and is rotatably fixed to the fixed cylinder 14a. The rotating cylinder 15a includes a rotating cylinder 15a held by the cylinder 14a, and the outer surface side portion 15A is guided by the engaging claw portion 143 and the fitting step portion 144 and moves in the engaging groove 141a in the circumferential direction of the cylinder. A plurality of engaging claws 151a provided at intervals in the circumferential direction, and a through hole 152a provided in a portion where the engaging claws 151 are not provided in the circumferential direction. Is a portion corresponding to the through hole 152a in the circumferential direction. Notch 142a may be formed on.

(2) Moreover, although this embodiment demonstrated the form which has the engaging nail | claw part 151 in the rotary cylinder 15, this invention is not limited to this. As shown in FIG. 11, the engaging claw part 143b may be provided in the fixed cylinder 14b.
That is, the fixed cylinder 14b having a plurality of engaging claw portions 143b provided on the inner surface side with an interval in the circumferential direction and a through hole 142b provided in a portion where the engaging claw portions 143b are not provided in the circumferential direction. And an inner surface side portion 15B provided on the inner surface side of the fixed tube 14b, and a rotating tube 15b held by the fixed tube 14b so as to be rotatable with respect to the fixed tube 14b. Fitting diameter part 153b provided on the side, engagement claw part 154b provided on the outer surface side spaced from the fitting diameter part 153b in the optical axis direction, fitting diameter part 153b and engagement claw part 154b The fitting groove 151b may be formed with a notch 152b at a portion corresponding to the through hole 152 in the circumferential direction.

(3) Further, in the present embodiment, the fixed cylinder 14 is outside, the rotating cylinder 15 is inside, and the engaging claw portion 151 is in the rotating cylinder 15, but the present invention is not limited to this. As shown in FIG. 12, the fixed cylinder 14c may be on the inner side, the rotary cylinder 15c may be on the outer side, and the engaging claw 143b may be provided on the fixed cylinder 14b.
In other words, a fixed cylinder 14c having a plurality of engaging claw portions 141c provided on the outer surface side with an interval in the circumferential direction and a through hole 142c provided in a portion where the engaging claw portions 141c are not provided in the circumferential direction. And an inner surface side portion 15C provided on the inner surface side of the fixed tube 14c, and a rotating tube 15c held by the fixed tube 14c so as to be rotatable with respect to the fixed tube 14c. Fitting diameter portion 153c provided on the side, engagement claw portion 154c provided on the inner surface side spaced from the fitting diameter portion 153c in the optical axis direction, fitting diameter portion 153c and engagement claw portion 154c The fitting diameter portion 153c may be formed with a notch 152c at a portion corresponding to the through hole 142c in the circumferential direction.

(4) The present embodiment is an embodiment in which the present invention is applied to the connecting portion 100 between the rotating cylinder 15 and the fixed cylinder 14 for zooming. However, the application site of the present invention is not limited to this, and may be applied to a site where two members are coupled so as to be relatively rotatable, for example, a coupling site of a focus operation ring.

(5) Furthermore, in the present embodiment, the detachable lens barrel has been described, but the present invention is not limited to this, and may be applied to a camera in which the camera body and the lens barrel are integrated.

  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: Camera, 2: Camera body, 21: Image sensor, 10: Lens barrel, 14: Fixed tube, 15: Zoom operation tube, 100: Connection portion, 101: Waterproof breathable sheet, 140: Fitting recess, 141: Engaging groove, 142: notch, 143: engaging claw, 144: fitting step, 150: inner fitting, 151: engaging claw, 152: through hole, D1, D2: gap, OA : Optical axis, S1, S2: Space

Claims (10)

Provided between the first protrusion provided on the inner surface side, and a second protrusion provided on the inner surface side at intervals in the optical axis direction from the first protrusion, and the second protrusion and the first protrusion A fixed cylinder having a recessed portion,
A rotating cylinder that has an inner surface side portion provided on the inner surface side of the fixed cylinder and is held by the fixed cylinder so as to be relatively rotatable with respect to the fixed cylinder;
An inner cylinder provided on the inner surface side of the fixed cylinder;
A rectilinear cylinder that is provided between the outer surface side of the inner cylinder and the inner surface side of the rotating cylinder, and is relatively movable in the optical axis direction according to the relative rotation of the rotating cylinder;
Including
The inner surface side portion is guided by the first protrusion and the second protrusion, and moves in the recess in the circumferential direction of the cylinder, and a plurality of third protrusions provided at intervals in the circumferential direction of the rotating cylinder, A through hole provided in a portion where the third protrusion is not provided in the circumferential direction,
The first protrusion has a notch formed in a portion corresponding to the through hole in the circumferential direction,
The through-hole communicates with a space between the outer surface side of the inner cylinder and the inner surface side of the rotary cylinder so that the volume changes according to the relative movement of the rectilinear cylinder;
A lens barrel characterized by The lens barrel according to claim 1,
The through holes and the third protrusions are alternately provided in the circumferential direction;
A lens barrel characterized by The lens barrel according to claim 1 or 2,
The through hole and the cutout portion extend in a circumferential direction, and at least a part of the through hole and the cutout portion are adjacent to each other in the entire movement range of the rotary tube relative to the fixed tube;
A lens barrel characterized by In the lens barrel according to any one of claims 1 to 3,
A gap D2 is provided between the fixed cylinder and the rotating cylinder to communicate the external space with the notch;
A lens barrel characterized by In the lens barrel according to any one of claims 1 to 4,
A member having waterproofness and air permeability is disposed on the inner peripheral side of the through hole,
A lens barrel characterized by In the lens barrel according to any one of claims 1 to 5,
The rotating cylinder is a zoom operation ring or a focus operation ring;
A lens barrel characterized by A first protrusion provided on the outer surface side, a second protrusion provided on the outer surface side spaced from the first protrusion in the optical axis direction, and provided between the first protrusion and the second protrusion. A fixed cylinder having a recessed portion,
A rotating cylinder having an outer surface side portion provided on an outer surface side of the fixed cylinder, and held by the fixed cylinder so as to be relatively rotatable with respect to the fixed cylinder;
An inner cylinder provided on the inner surface side of the fixed cylinder;
A rectilinear cylinder that is provided between the outer surface side of the inner cylinder and the inner surface side of the rotating cylinder, and is relatively movable in the optical axis direction according to the relative rotation of the rotating cylinder;
Including
The outer surface side portion is guided by the first protrusion and the second protrusion and moves in the recess in the circumferential direction of the cylinder, and a plurality of third protrusions provided at intervals in the circumferential direction of the rotating cylinder, A through hole provided in a portion where the third protrusion is not provided in the circumferential direction,
The first protrusion has a notch formed in a portion corresponding to the through hole in the circumferential direction,
The through-hole communicates with a space between the outer surface side of the inner cylinder and the inner surface side of the rotary cylinder so that the volume changes according to the relative movement of the rectilinear cylinder;
A lens barrel characterized by A fixed cylinder having a plurality of first protrusions provided on the inner surface side with an interval in the circumferential direction; and a through hole provided in a portion where the first protrusion is not provided in the circumferential direction;
A rotating cylinder that has an inner surface side portion provided on the inner surface side of the fixed cylinder and is held by the fixed cylinder so as to be relatively rotatable with respect to the fixed cylinder;
An inner cylinder provided on the inner surface side of the fixed cylinder;
A rectilinear cylinder that is provided between the outer surface side of the inner cylinder and the inner surface side of the rotating cylinder, and is relatively movable in the optical axis direction according to the relative rotation of the rotating cylinder;
Including
The inner surface portion includes a second protrusion provided on the outer surface side, a third protrusion provided on the outer surface side spaced from the second protrusion in the optical axis direction, the second protrusion, and the third protrusion. And a recess provided between
The second protrusion has a notch formed in a portion corresponding to the through hole in the circumferential direction,
The through-hole communicates with a space between the outer surface side of the inner cylinder and the inner surface side of the rotary cylinder so that the volume changes according to the relative movement of the rectilinear cylinder;
A lens barrel characterized by A first projection provided more on the outer surface side at a interval in the circumferential direction, a fixed cylinder having a through-hole in which the first protrusion in the circumferential direction is provided in a portion not provided,
A rotating cylinder that has an inner surface side portion provided on the inner surface side of the fixed cylinder and is held by the fixed cylinder so as to be relatively rotatable with respect to the fixed cylinder;
An inner cylinder provided on the inner surface side of the fixed cylinder;
A rectilinear cylinder that is provided between the outer surface side of the inner cylinder and the inner surface side of the rotating cylinder, and is relatively movable in the optical axis direction according to the relative rotation of the rotating cylinder;
The inner surface side portion includes a second protrusion provided on the inner surface side, a third protrusion provided on the inner surface side spaced from the second protrusion in the optical axis direction, the second protrusion, and the A recess provided between the third protrusion and
The second protrusion has a notch formed in a portion corresponding to the through hole in the circumferential direction,
The through-hole communicates with a space between the outer surface side of the inner cylinder and the inner surface side of the rotary cylinder so that the volume changes according to the relative movement of the rectilinear cylinder;
A lens barrel characterized by   An imaging device comprising the lens barrel according to any one of claims 1 to 9.

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