JP6879403B2 - Lens barrel and camera - Google Patents

Lens barrel and camera Download PDF

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JP6879403B2
JP6879403B2 JP2020037289A JP2020037289A JP6879403B2 JP 6879403 B2 JP6879403 B2 JP 6879403B2 JP 2020037289 A JP2020037289 A JP 2020037289A JP 2020037289 A JP2020037289 A JP 2020037289A JP 6879403 B2 JP6879403 B2 JP 6879403B2
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cylinder
cam groove
lens barrel
protrusion
pin
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藤原　誠
誠 藤原
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Nikon Corp
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Description

本発明は、レンズ鏡筒およびカメラに関するものである。 The present invention relates to a lens barrel and a camera.

従来、レンズ鏡筒が先端から落下して地面等に衝突した場合、その衝撃により、カム溝のカムピンとの接触部分が変形し、ズーム操作の感触が悪くなったりすることがある。この問題を解決するために、内部を移動するカムピンが同一の軌跡を描くようなカム溝を２つ設けたレンズ鏡筒がある（特許文献１参照）。 Conventionally, when the lens barrel falls from the tip and collides with the ground or the like, the impact may deform the contact portion of the cam groove with the cam pin, resulting in a poor zoom operation feel. In order to solve this problem, there is a lens barrel provided with two cam grooves so that the cam pins moving inside draw the same trajectory (see Patent Document 1).

特開２００３−４３３３１号公報Japanese Unexamined Patent Publication No. 2003-43331

本発明は、径方向に延びる第１突起および第２突起が設けられた第１筒と、前記第１突起が係合する第１カム溝、および、前記第２突起が内部に位置することが可能な第２カム溝が設けられた第２筒と、前記光軸を中心として周方向に延びて前記第２突起が内部に位置する周溝が設けられた第３筒と、を備え、前記第１カム溝の一端の光軸方向に対する傾きは、他端の光軸に対する傾きよりも小さく、前記第１突起が前記第１カム溝の前記一端に位置するとき、前記第２突起は前記第２カム溝の外部に位置し、前記第２突起が前記第２カム溝の外部に位置しているときも、前記第２突起は前記周溝の内部に位置する構成とした。
また、本発明のカメラは、上記レンズ鏡筒を備える構成とした。 In the present invention, the first cylinder provided with the first protrusion and the second protrusion extending in the radial direction, the first cam groove with which the first protrusion engages, and the second protrusion may be located inside. A second cylinder provided with a possible second cam groove and a third cylinder provided with a circumferential groove extending in the circumferential direction about the optical axis and having the second protrusion located inside are provided. The inclination of one end of the first cam groove with respect to the optical axis is smaller than the inclination of the other end with respect to the optical axis, and when the first protrusion is located at the one end of the first cam groove, the second protrusion is said to be the first. Even when the second protrusion is located outside the two cam grooves and the second protrusion is located outside the second cam groove, the second protrusion is located inside the peripheral groove .
Further, the camera of the present invention is configured to include the lens barrel.

本実施形態のレンズ鏡筒の概略的な側面図であり、ワイドの状態を示す。It is a schematic side view of the lens barrel of this embodiment, and shows the wide state. 本実施形態のレンズ鏡筒の概略的な側面図であり、ワイドの状態とテレの状態との間のミドルの状態を示す。It is a schematic side view of the lens barrel of this embodiment, and shows the middle state between the wide state and the tele state. 本実施形態のレンズ鏡筒の概略的な構成を示す側面図であり、テレの状態を示す。It is a side view which shows the schematic structure of the lens barrel of this embodiment, and shows the state of telephony. 第１レンズ移動筒と前固定筒とのワイドの状態の展開図を示す。The development view of the wide state of the 1st lens moving cylinder and the front fixed cylinder is shown. 第１レンズ移動筒と前固定筒とのミドルの状態の展開図を示す。The development view of the middle state of the 1st lens moving cylinder and the front fixed cylinder is shown. 第１レンズ移動筒と前固定筒とのテレの状態の展開図を示す。The development view of the telestate state of the 1st lens moving cylinder and the front fixed cylinder is shown. ミドルの状態およびテレの状態における、第２ピンの周囲の拡大図である。It is an enlarged view around the 2nd pin in the middle state and the tele state. 図１における部分Ａの拡大図である。It is an enlarged view of the part A in FIG. 固定リング、中固定筒および後固定筒の分解斜視図である。It is an exploded perspective view of the fixing ring, the middle fixing cylinder and the rear fixing cylinder.

以下、図面等を参照して実施形態について説明する。図１は、本実施形態のレンズ鏡筒１の概略的な側面図であり、ワイド（広角）の状態を示す。図２は、本実施形態のレンズ鏡筒１の概略的な側面図であり、ワイドの状態とテレ（望遠）の状態との間のミドルの状態を示す。図３は、本実施形態のレンズ鏡筒１の概略的な構成を示す側面図であり、テレの状態を示す。 Hereinafter, embodiments will be described with reference to the drawings and the like. FIG. 1 is a schematic side view of the lens barrel 1 of the present embodiment, showing a wide-angle state. FIG. 2 is a schematic side view of the lens barrel 1 of the present embodiment, showing a middle state between a wide state and a tele (telephoto) state. FIG. 3 is a side view showing a schematic configuration of the lens barrel 1 of the present embodiment, and shows a state of telephoto.

本実施形態のレンズ鏡筒１は、図１において点線で示すカメラボディ２に着脱可能な交換式のレンズ鏡筒１である。なお、本実施形態のレンズ鏡筒１は、カメラボディに着脱可能なレンズ鏡筒であるが、これに限らず、カメラボディと一体のレンズ鏡筒であってもよい。 The lens barrel 1 of the present embodiment is an interchangeable lens barrel 1 that can be attached to and detached from the camera body 2 shown by the dotted line in FIG. The lens barrel 1 of the present embodiment is a lens barrel that can be attached to and detached from the camera body, but the present invention is not limited to this, and a lens barrel that is integrated with the camera body may be used.

レンズ鏡筒１は、被写体側から順に配置された第１レンズ群Ｌ１、第２レンズ群Ｌ２、第３レンズ群Ｌ３および第４レンズ群Ｌ４を備える。
また、レンズ鏡筒１は、レンズ側マウント部１１、後固定筒２７、中固定筒２６、前固定筒２４、第１カム筒２２、第２カム筒２３、第１レンズ移動筒４０、第１移動枠５１、第２移動枠５２、第３移動枠５３、第４移動枠５４、フォーカスリング６１、ズーム操作リング２０およびズーム連動キー２１を備える。
ただし、レンズ鏡筒１の構成はこれに限定されるものではなく、固定筒、カム筒、移動枠の数や、以下に述べる配置は、本実施形態と異なるものであってもよい。 The lens barrel 1 includes a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L4 arranged in order from the subject side.
Further, the lens barrel 1 includes a lens side mount portion 11, a rear fixed cylinder 27, a middle fixed cylinder 26, a front fixed cylinder 24, a first cam cylinder 22, a second cam cylinder 23, a first lens moving cylinder 40, and a first lens barrel. It includes a moving frame 51, a second moving frame 52, a third moving frame 53, a fourth moving frame 54, a focus ring 61, a zoom operation ring 20, and a zoom interlocking key 21.
However, the configuration of the lens barrel 1 is not limited to this, and the number of fixed cylinders, cam cylinders, moving frames, and the arrangement described below may be different from those of the present embodiment.

レンズ側マウント部１１は、カメラボディ２のレンズ側マウント部（図示せず）に着脱可能なバヨネットレンズ側マウント部である。ただし、レンズ鏡筒１とカメラボディ２の着脱構造はバヨネットレンズ側マウント部に限定されるものではない。
カメラボディ２には、不図示の撮像素子が設けられており、その撮像素子の撮像面に、レンズ鏡筒１のレンズ群Ｌ１〜Ｌ４による被写体像が結像される。 The lens-side mount portion 11 is a bayonet lens-side mount portion that can be attached to and detached from the lens-side mount portion (not shown) of the camera body 2. However, the attachment / detachment structure of the lens barrel 1 and the camera body 2 is not limited to the bayonet lens side mount portion.
The camera body 2 is provided with an image sensor (not shown), and a subject image formed by the lens groups L1 to L4 of the lens barrel 1 is formed on the image pickup surface of the image sensor.

後固定筒２７は、レンズ側マウント部１１に固定され、中固定筒２６は、後固定筒２７に固定され、前固定筒２４は、中固定筒２６に固定されている。
なお、後固定筒２７と、中固定筒２６と、前固定筒２４との間の固定方法については後述する。 The rear fixing cylinder 27 is fixed to the lens side mount portion 11, the middle fixing cylinder 26 is fixed to the rear fixing cylinder 27, and the front fixing cylinder 24 is fixed to the middle fixing cylinder 26.
The method of fixing between the rear fixing cylinder 27, the middle fixing cylinder 26, and the front fixing cylinder 24 will be described later.

第１カム筒２２は、前固定筒２４の内径側に回転可能に配置されている。なお、第１カム筒２２と前固定筒２４と、第１レンズ移動筒４０と係合関係についても後述する。
第２カム筒２３は、後固定筒２７の外径側に回転可能に配置されている。 The first cam cylinder 22 is rotatably arranged on the inner diameter side of the front fixed cylinder 24. The engagement relationship between the first cam cylinder 22, the front fixed cylinder 24, and the first lens moving cylinder 40 will also be described later.
The second cam cylinder 23 is rotatably arranged on the outer diameter side of the rear fixing cylinder 27.

第１レンズ移動筒４０は、前固定筒２４の先端の外径側に光軸ＯＡ方向に移動可能に配置されている。 The first lens moving cylinder 40 is arranged so as to be movable in the optical axis OA direction on the outer diameter side of the tip of the front fixed cylinder 24.

第１移動枠５１は、第１レンズ移動筒４０の先端に保持されている。第２移動枠５２は、第１カム筒２２の内径側に、光軸ＯＡ方向に移動可能に配置されている。第３移動枠５３は、後固定筒２７の内径側に配置され、第２カム筒２３の回転により駆動される。第４移動枠５４は、後固定筒２７の内径側に光軸ＯＡ方向に移動可能に配置されている。 The first moving frame 51 is held at the tip of the first lens moving cylinder 40. The second moving frame 52 is arranged on the inner diameter side of the first cam cylinder 22 so as to be movable in the optical axis OA direction. The third moving frame 53 is arranged on the inner diameter side of the rear fixing cylinder 27 and is driven by the rotation of the second cam cylinder 23. The fourth moving frame 54 is arranged on the inner diameter side of the rear fixing cylinder 27 so as to be movable in the optical axis OA direction.

フォーカスリング６１は、前固定筒２４の外径側に回転可能に取り付けられ、不図示の連結キーによって、その回転動作が伝達されるように第２移動枠５２に連結されている。
フォーカスリング６１を回転させると、第１カム筒２２が回転する。この回転によってフォーカシング動作が行われる。 The focus ring 61 is rotatably attached to the outer diameter side of the front fixing cylinder 24, and is connected to the second moving frame 52 by a connecting key (not shown) so that the rotational operation is transmitted.
When the focus ring 61 is rotated, the first cam cylinder 22 is rotated. Focusing operation is performed by this rotation.

ズーム操作リング２０は、第２カム筒２３の外径側に配置されている。
ズーム連動キー２１は、ズーム操作リング２０に取付けられ、第１カム筒２２と第２カム筒２３とを係合している。 The zoom operation ring 20 is arranged on the outer diameter side of the second cam cylinder 23.
The zoom interlocking key 21 is attached to the zoom operation ring 20 and engages the first cam cylinder 22 and the second cam cylinder 23.

ズーム操作リング２０を手動で回転させると、ズーム連動キー２１を介して、第２カム筒２３が回転し、それに伴い第１カム筒２２が回転する。
この回転によって第１レンズ移動筒４０、第１移動枠５１、第２移動枠５２、第３移動枠５３および第４移動枠５４が光軸ＯＡ方向に直進移動し、ズーミング動作が行われる。 When the zoom operation ring 20 is manually rotated, the second cam cylinder 23 is rotated via the zoom interlocking key 21, and the first cam cylinder 22 is rotated accordingly.
By this rotation, the first lens moving cylinder 40, the first moving frame 51, the second moving frame 52, the third moving frame 53, and the fourth moving frame 54 move straight in the optical axis OA direction, and a zooming operation is performed.

図１に示すように、第１レンズ群はワイドの状態で最も繰出し、図２に示すようにミドルの状態で最も繰込み、図３に示すようにテレの状態ではミドルの状態よりも繰出し、ワイドの状態よりも繰込んだ状態となる。 As shown in FIG. 1, the first lens group is extended most in the wide state, is most extended in the middle state as shown in FIG. 2, and is extended more than the middle state in the tele state as shown in FIG. It will be in a more advanced state than in a wide state.

図４は、第１レンズ移動筒４０と前固定筒２４とのワイドの状態の展開図を示す。図５は、第１レンズ移動筒４０と前固定筒２４とのミドルの状態の展開図を示す。図６は、第１レンズ移動筒４０と前固定筒２４とのテレの状態の展開図を示す。
また、図４から図６においては、それぞれの状態における後述する第１レンズ移動筒４０に設置されたインナー直進溝４１、第１インナーカム溝４２、第２インナーカム溝４３、１群直進ピン３１、１群カムピン３２および第２ピン３０の位置関係も示す。 FIG. 4 shows a developed view of a wide state of the first lens moving cylinder 40 and the front fixed cylinder 24. FIG. 5 shows a developed view of a middle state of the first lens moving cylinder 40 and the front fixed cylinder 24. FIG. 6 shows a development view of a telephoto state of the first lens moving cylinder 40 and the front fixed cylinder 24.
Further, in FIGS. 4 to 6, the inner straight groove 41, the first inner cam groove 42, the second inner cam groove 43, and the first group straight pin 31 installed in the first lens moving cylinder 40 to be described later in each state. The positional relationship between the first group cam pin 32 and the second pin 30 is also shown.

前固定筒２４には、光軸ＯＡを中心とした周方向に延びるように設けられた円周溝２５および１群直進ピン３１が設けられている。円周溝２５および１群直進ピン３１はそれぞれ周方向に均等に３つ設けられている。 The front fixing cylinder 24 is provided with a circumferential groove 25 and a group 1 straight-ahead pin 31 provided so as to extend in the circumferential direction about the optical axis OA. Three circumferential grooves 25 and three group 1 straight pins 31 are evenly provided in the circumferential direction.

第１レンズ移動筒４０には、インナー直進溝４１、第１インナーカム溝４２、および第２インナーカム溝４３がそれぞれ周方向に均等に３本設けられている。 The first lens moving cylinder 40 is provided with three inner straight grooves 41, a first inner cam groove 42, and a second inner cam groove 43 evenly in the circumferential direction.

インナー直進溝４１は、光軸ＯＡに沿った方向に延び、前固定筒２４に取付けられた１群直進ピン３１が挿入されることにより第１レンズ移動筒４０の円周方向の移動が規制されている。 The inner straight groove 41 extends in the direction along the optical axis OA, and the movement of the first lens moving cylinder 40 in the circumferential direction is restricted by inserting the group 1 straight pin 31 attached to the front fixing cylinder 24. ing.

第１インナーカム溝４２は、光軸ＯＡを中心とした周方向に対する傾き（圧力角）θが位置によって異なるカム溝で、第１カム筒２２に取付けられた１群カムピン３２が挿入される。 The first inner cam groove 42 is a cam groove in which the inclination (pressure angle) θ with respect to the circumferential direction about the optical axis OA differs depending on the position, and the first group cam pin 32 attached to the first cam cylinder 22 is inserted.

第１カム筒２２に取り付けられた１群カムピン３２は、第１カム筒２２の回転を第１レンズ移動筒４０に伝達し、第２ピン３０は、光軸ＯＡ方向の移動を規制する。
また、第１カム筒２２には第２レンズ群Ｌ２を駆動するためのカム溝（図示せず）が設置されている。 The group 1 cam pin 32 attached to the first cam cylinder 22 transmits the rotation of the first cam cylinder 22 to the first lens moving cylinder 40, and the second pin 30 regulates the movement in the optical axis OA direction.
Further, the first cam cylinder 22 is provided with a cam groove (not shown) for driving the second lens group L2.

第２インナーカム溝４３は、第１インナーカム溝４２の光軸ＯＡ方向のカメラボディ側（撮像面側）に設けられ、内部を移動する第２ピンの移動の軌跡が、第１インナーカム溝４２内を移動する１群カムピン３２の移動の軌跡と同一になるように形成されている。すなわち、第２インナーカム溝４３と、第１インナーカム溝４２とは、一定の間隔を置いて互いに平行となるように設けられ、同一のカーブを有している。 The second inner cam groove 43 is provided on the camera body side (imaging surface side) of the first inner cam groove 42 in the optical axis OA direction, and the locus of movement of the second pin that moves inside is the first inner cam groove. It is formed so as to be the same as the movement locus of the first group cam pin 32 moving in the 42. That is, the second inner cam groove 43 and the first inner cam groove 42 are provided so as to be parallel to each other at regular intervals and have the same curve.

第２インナーカム溝４３と第１インナーカム溝４２との相違点は、長さが異なることであり、第２インナーカム溝４３は第１インナーカム溝４２より短い。
すなわち、第２インナーカム溝４３は、第１インナーカム溝４２と比べると、一端である光軸ＯＡ方向カメラボディ側（撮像面側）が途中で切れている。そして、第２インナーカム溝４３は光軸ＯＡカメラボディ側（撮像面側）において、第１レンズ移動筒４０の端面４０ａを貫通している。
このように第２インナーカム溝４３は第１インナーカム溝４２より短いので、レンズ鏡筒１がワイドの状態の場合、第２ピン３０は第２インナーカム溝４３の外に位置する。すなわち、第２ピン３０は、レンズ鏡筒１がミドルの状態からワイドの状態に操作された場合、第２インナーカム溝４３の内部から端面４０ａを通過して、第２インナーカム溝４３のカメラボディ側（撮像面側）の外部へと移動することになる。 The difference between the second inner cam groove 43 and the first inner cam groove 42 is that the length is different, and the second inner cam groove 43 is shorter than the first inner cam groove 42.
That is, the second inner cam groove 43 is cut off at one end on the camera body side (imaging surface side) in the optical axis OA direction as compared with the first inner cam groove 42. The second inner cam groove 43 penetrates the end surface 40a of the first lens moving cylinder 40 on the optical axis OA camera body side (imaging surface side).
Since the second inner cam groove 43 is shorter than the first inner cam groove 42 in this way, the second pin 30 is located outside the second inner cam groove 43 when the lens barrel 1 is in the wide state. That is, when the lens barrel 1 is operated from the middle state to the wide state, the second pin 30 passes through the end surface 40a from the inside of the second inner cam groove 43, and the camera of the second inner cam groove 43 It will move to the outside of the body side (imaging surface side).

一方、図２のミドルの状態および図３のテレの状態において、第２ピン３０は第２インナーカム溝４３内に位置する。
図７は、ミドルの状態およびテレの状態における、第２ピン３０の周囲の拡大図であり、第２ピン３０と、第１カム筒２２と、前固定筒２４と、第１レンズ移動筒４０とを示す。
図示するように第２ピン３０は、固定部３０ｄと、固定部３０ｄから延びる第１部分３０ａと、第２部分３０ｂと、その間に設けられた小径部３０ｃと、を備える。第１部分３０ａ、第２部分３０ｂ、小径部３０ｃの順に径が小さくなっている。 On the other hand, in the middle state of FIG. 2 and the tele state of FIG. 3, the second pin 30 is located in the second inner cam groove 43.
FIG. 7 is an enlarged view of the periphery of the second pin 30 in the middle state and the tele state, and is a second pin 30, a first cam cylinder 22, a front fixed cylinder 24, and a first lens moving cylinder 40. And.
As shown in the figure, the second pin 30 includes a fixing portion 30d, a first portion 30a extending from the fixing portion 30d, a second portion 30b, and a small diameter portion 30c provided between them. The diameter is reduced in the order of the first portion 30a, the second portion 30b, and the small diameter portion 30c.

第２ピン３０の固定部３０ｄは第１カム筒２２に固定されている。
第２ピン３０の第１部分３０ａは、前固定筒２４に設けられた円周溝２５に係合することで、第１カム筒２２の光軸方向の移動を規制している。
第２ピン３０の小径部３０ｃの外径側および第２部分３０ｂは、円周溝２５から突き出している。 The fixing portion 30d of the second pin 30 is fixed to the first cam cylinder 22.
The first portion 30a of the second pin 30 regulates the movement of the first cam cylinder 22 in the optical axis direction by engaging with the circumferential groove 25 provided in the front fixing cylinder 24.
The outer diameter side of the small diameter portion 30c of the second pin 30 and the second portion 30b project from the circumferential groove 25.

上述のように第１レンズ移動筒４０の第１インナーカム溝４２には、第１カム筒２２に取付けられた１群カムピン３２が挿入されている。第１カム筒２２が回転すると、その回転は１群カムピン３２により第１レンズ移動筒４０に伝達され、第１レンズ移動筒４０は第１インナーカム溝４２に沿って、光軸ＯＡ方向に移動する。 As described above, the group 1 cam pin 32 attached to the first cam cylinder 22 is inserted into the first inner cam groove 42 of the first lens moving cylinder 40. When the first cam cylinder 22 rotates, the rotation is transmitted to the first lens moving cylinder 40 by the group 1 cam pin 32, and the first lens moving cylinder 40 moves in the optical axis OA direction along the first inner cam groove 42. To do.

図１に示すようにワイド端において、１群カムピン３２は第１インナーカム溝４２内に位置する。しかし。第２ピン３０は第２インナーカム溝４３内に位置していない。すなわち、第２ピン３０は第２インナーカム溝４３の外に位置する。 As shown in FIG. 1, at the wide end, the group 1 cam pin 32 is located in the first inner cam groove 42. However. The second pin 30 is not located in the second inner cam groove 43. That is, the second pin 30 is located outside the second inner cam groove 43.

第１レンズ移動筒４０がズーミングでワイド端からテレ側に移動すると、図２および図３に示すように第２インナーカム溝４３に第２ピン３０の第２部分３０ｂが入り込む。 When the first lens moving cylinder 40 moves from the wide end to the tele side by zooming, the second portion 30b of the second pin 30 enters the second inner cam groove 43 as shown in FIGS. 2 and 3.

第２ピン３０は、第２ピン３０の第２部分３０ｂが第２インナーカム溝４３内にある場合、図７に示すように、第２ピン３０の第２部分３０ｂの光軸ＯＡに沿った方向における中心４３ｂが、第２インナーカム溝４３の光軸ＯＡに沿った方向における中心４３ａから被写体側へオフセットした状態となるように、第１カム筒２２に取り付けられている。
したがって、この第２ピン３０の第２部分３０ｂが第２インナーカム溝４３内にある場合、第２インナーカム溝４３の被写体側端面４３ｃと第２部分３０ｂとの間隔ｄよりも、カメラボディ側（撮像面側）端面４３ｄと第２部分３０ｂとの間隔Ｄは広くなっている。 The second pin 30 is along the optical axis OA of the second portion 30b of the second pin 30 as shown in FIG. 7 when the second portion 30b of the second pin 30 is in the second inner cam groove 43. The center 43b in the direction is attached to the first cam cylinder 22 so as to be offset from the center 43a in the direction along the optical axis OA of the second inner cam groove 43 toward the subject.
Therefore, when the second portion 30b of the second pin 30 is in the second inner cam groove 43, the camera body side of the second inner cam groove 43 is closer to the camera body than the distance d between the subject side end surface 43c and the second portion 30b. The distance D between the end surface 43d and the second portion 30b (on the imaging surface side) is wide.

次に、本実施形態における中固定筒２６と後固定筒２７との固定方法を説明する。図８は、図１における部分Ａの拡大図である。図９は、固定リング１００，中固定筒２６および後固定筒２７の分解斜視図である。 Next, a method of fixing the middle fixing cylinder 26 and the rear fixing cylinder 27 in the present embodiment will be described. FIG. 8 is an enlarged view of a portion A in FIG. FIG. 9 is an exploded perspective view of the fixing ring 100, the middle fixing cylinder 26, and the rear fixing cylinder 27.

後固定筒２７の先端側は、他の部分よりも内径が大きくなる拡大内径部２７ｃを有する。拡大内径部２７ｃと他の部分とは、径が異なるため、その境界に、被写体側を向く側面２７ｂが形成される。
また、拡大内径部２７ｃの内面には、後固定部ねじ部が設けられている。
中固定筒２６は、円環部材で、その最外径２６ａは、後固定筒２７の拡大内径部２７ｃの内径より小さい。 The tip end side of the rear fixing cylinder 27 has an enlarged inner diameter portion 27c whose inner diameter is larger than that of other portions. Since the enlarged inner diameter portion 27c and the other portion have different diameters, a side surface 27b facing the subject side is formed at the boundary thereof.
Further, a rear fixing portion screw portion is provided on the inner surface of the enlarged inner diameter portion 27c.
The middle fixing cylinder 26 is a ring member, and its outermost diameter 26a is smaller than the inner diameter of the enlarged inner diameter portion 27c of the rear fixing cylinder 27.

本実施形態のレンズ鏡筒１は、後固定筒２７と中固定筒２６とを連結させる固定リング１００を備える。
固定リング１００は円環形状で、円筒部１０１と、円筒部１０１の被写体側端部より径方向の外側に延びる鍔部１０２と、円筒部１０１の径方向の内側内方に延びる内延部１０３とを備える。
円筒部１０１の外径側には、固定リングねじ部１０４が設けられている。固定リングねじ部１０４は後固定筒ねじ部２７ａに螺合する。 The lens barrel 1 of the present embodiment includes a fixing ring 100 for connecting the rear fixed cylinder 27 and the middle fixed cylinder 26.
The fixing ring 100 has a ring shape, and has a cylindrical portion 101, a flange portion 102 extending radially outward from the subject-side end portion of the cylindrical portion 101, and an inward extending portion 103 extending radially inward and inward of the cylindrical portion 101. And.
A fixing ring screw portion 104 is provided on the outer diameter side of the cylindrical portion 101. The fixing ring screw portion 104 is screwed into the rear fixing cylinder screw portion 27a.

内延部１０３における円筒部１０１から連続する部分には、斜面１０５が設けられている。すなわち、円筒部１０１から内延部１０３にかけて、内径が徐々に小さくなる。 A slope 105 is provided in a portion of the inward extension 103 that is continuous with the cylindrical portion 101. That is, the inner diameter gradually decreases from the cylindrical portion 101 to the inward extension portion 103.

中固定筒２６を、後固定筒２７の拡大内径部２７ｃ側より挿入する。そして、中固定筒２６と後固定筒２７の拡大内径部２７ｃとの間に固定リング１００の円筒部１０１をねじ込み、後固定筒ねじ部２７ａと固定リングねじ部１０４とを螺合させる。 The middle fixing cylinder 26 is inserted from the enlarged inner diameter portion 27c side of the rear fixing cylinder 27. Then, the cylindrical portion 101 of the fixing ring 100 is screwed between the middle fixing cylinder 26 and the enlarged inner diameter portion 27c of the rear fixing cylinder 27, and the rear fixing cylinder screw portion 27a and the fixing ring screw portion 104 are screwed together.

固定リング１００の回転が進むにつれ、固定リング１００の斜面１０５が中固定筒２６の被写体側の外端部を押圧する。中固定筒２６のカメラボディ側（撮像面側）端面は、後固定筒２７の側面２７ｂに押圧される。
また、固定リング１００が中固定筒２６を押圧する部分は斜面１０５であるので、中固定筒２６は光軸ＯＡに向かう方向（中心に向かう方向）にも押圧され、中固定筒２６は光軸ＯＡに向かう方向に位置決めされる。 As the rotation of the fixing ring 100 progresses, the slope 105 of the fixing ring 100 presses the outer end portion of the middle fixing cylinder 26 on the subject side. The camera body side (imaging surface side) end surface of the middle fixed cylinder 26 is pressed against the side surface 27b of the rear fixed cylinder 27.
Further, since the portion where the fixing ring 100 presses the middle fixing cylinder 26 is the slope 105, the middle fixing cylinder 26 is also pressed in the direction toward the optical axis OA (direction toward the center), and the middle fixing cylinder 26 is pressed against the optical axis 26. Positioned in the direction toward OA.

（本実施形態の効果）
（１）本実施形態によると、径方向外側に延びる１群カムピン３２および第２ピン３０が設けられた前固定筒２４と、第１レンズ群Ｌ１を間接的に保持し、１群カムピン３２が係合する第１インナーカム溝４２、および、第２ピン３０が内部を移動する第２インナーカム溝４３が設けられ、前固定筒２４の光軸ＯＡを中心とした回転によって１群カムピン３２を介して光軸ＯＡ方向に駆動される第１レンズ移動筒４０と、を備え、第２インナーカム溝４３は第１インナーカム溝４２より短く、１群カムピン３２が第１インナーカム溝４２のカメラボディ側（撮像面側）端部に位置するとき、第２ピン３０は第２インナーカム溝４３の外部に位置している。 (Effect of this embodiment)
(1) According to the present embodiment, the front fixed cylinder 24 provided with the first group cam pin 32 and the second pin 30 extending radially outward and the first lens group L1 are indirectly held, and the first group cam pin 32 is provided. A first inner cam groove 42 to be engaged and a second inner cam groove 43 to which the second pin 30 moves inside are provided, and the first group cam pin 32 is rotated around the optical axis OA of the front fixed cylinder 24. The camera includes a first lens moving cylinder 40 driven in the optical axis OA direction via the camera, the second inner cam groove 43 is shorter than the first inner cam groove 42, and the first group cam pin 32 is the camera of the first inner cam groove 42. When located at the end on the body side (imaging surface side), the second pin 30 is located outside the second inner cam groove 43.

レンズ鏡筒１が落下して地面に衝突する等、先端から衝撃力Ｆが加わった場合、その衝撃力Ｆは、レンズ鏡筒１の先端から第１レンズ移動筒４０に伝達されて、１群カムピン３２に加わる。 When an impact force F is applied from the tip such as when the lens barrel 1 falls and collides with the ground, the impact force F is transmitted from the tip of the lens barrel 1 to the first lens moving cylinder 40, and one group. Join the cam pin 32.

ここで、図５及び図６で示すような第１インナーカム溝４２の圧力角θ（光軸ＯＡを中心とした周方向に対する傾き）が小さい領域に１群カムピン３２が位置する場合、１群カムピン３２に光軸ＯＡ方向の衝撃力Ｆが加わる。 Here, when the group 1 cam pin 32 is located in a region where the pressure angle θ (inclination with respect to the circumferential direction about the optical axis OA) of the first inner cam groove 42 as shown in FIGS. 5 and 6 is small, the group 1 An impact force F in the direction of the optical axis OA is applied to the cam pin 32.

しかし、本実施形態においては、第１インナーカム溝４２内に位置する１群カムピン３２と、第２インナーカム溝４３内に位置する第２ピン３０の第２部分３０ｂとでこの衝撃力Ｆを受けることができる。 However, in the present embodiment, the impact force F is applied by the group 1 cam pin 32 located in the first inner cam groove 42 and the second portion 30b of the second pin 30 located in the second inner cam groove 43. Can receive.

これにより、ズーミング駆動を行う１群カムピン３２等のズーム駆動部分への落下衝撃によるダメージを抑制し、ズーム作動感触やレンズ群偏芯による光学性能劣化を最小限にすることができる。 As a result, damage due to a drop impact on the zoom drive portion such as the first group cam pin 32 that performs zooming drive can be suppressed, and deterioration in optical performance due to the zoom operation feel and lens group eccentricity can be minimized.

また、第１レンズ移動筒４０に設けられている第２インナーカム溝４３は第１インナーカム溝４２より短い。したがって、カム溝が２本ある構造であっても、第２インナーカム溝４３と第１インナーカム溝４２とが同じ長さの場合と比べて第１レンズ移動筒４０を短くすることができる。ゆえにレンズ鏡筒１の大型化を抑制できる。 Further, the second inner cam groove 43 provided in the first lens moving cylinder 40 is shorter than the first inner cam groove 42. Therefore, even if the structure has two cam grooves, the first lens moving cylinder 40 can be shortened as compared with the case where the second inner cam groove 43 and the first inner cam groove 42 have the same length. Therefore, it is possible to suppress the increase in size of the lens barrel 1.

（２）本実施形態によると、図４で示すように第２ピン３０が第２インナーカム溝４３の外部に位置しているときに１群カムピン３２が位置する第１インナーカム溝４２の部分の圧力角θ（すなわち、光軸ＯＡを中心とした周方向に対する傾き角）は、第１インナーカム溝４２の他の部分よりも大きい。 (2) According to the present embodiment, as shown in FIG. 4, a portion of the first inner cam groove 42 in which the first group cam pin 32 is located when the second pin 30 is located outside the second inner cam groove 43. The pressure angle θ (that is, the inclination angle with respect to the circumferential direction about the optical axis OA) is larger than that of the other portion of the first inner cam groove 42.

圧力角θが大きいと、上述した図５及び図６に示す場合と異なり、先端から受ける衝撃力Ｆは第１レンズ移動筒４０の繰込みによって吸収できる。
したがって、１群カムピン３２へのダメージは小さいので、ワイド端において第２ピン３０による衝撃吸収構造を設けなくても、１群カムピン３２等の変形等が生じる可能性が低い。 When the pressure angle θ is large, unlike the cases shown in FIGS. 5 and 6 described above, the impact force F received from the tip can be absorbed by the carry-in of the first lens moving cylinder 40.
Therefore, since the damage to the group 1 cam pin 32 is small, it is unlikely that the group 1 cam pin 32 or the like will be deformed even if the shock absorbing structure by the second pin 30 is not provided at the wide end.

そこで、本実施形態では、第２インナーカム溝４３を必要最小限の長さとし、衝撃力が小さくなるワイド端においては第２インナーカム溝４３を設けない構造とした。
第２インナーカム溝４３をワイド端まで設ける必要がないので、第１レンズ移動筒４０の長さを短縮でき、衝撃吸収として必要な機能は確保しつつ且つ製品の大型化も抑制できる。 Therefore, in the present embodiment, the second inner cam groove 43 is set to the minimum necessary length, and the second inner cam groove 43 is not provided at the wide end where the impact force is small.
Since it is not necessary to provide the second inner cam groove 43 to the wide end, the length of the first lens moving cylinder 40 can be shortened, the function required for shock absorption can be ensured, and the size of the product can be suppressed.

（３）本実施形態によると、図７に示すように第２インナーカム溝４３内での第２ピン３０の光軸ＯＡに沿った方向における中心４３ｂは、第２インナーカム溝４３の光軸ＯＡに沿った方向における中心４３ａよりも被写体側にオフセットしている。 (3) According to the present embodiment, as shown in FIG. 7, the center 43b of the second pin 30 in the second inner cam groove 43 in the direction along the optical axis OA is the optical axis of the second inner cam groove 43. It is offset toward the subject side from the center 43a in the direction along the OA.

すなわち、図７に示す衝撃力Ｆが第２ピン３０に加わり、第２ピン３０が曲がったとしても、曲がる方向は、隙間の間隔Ｄの広いカメラボディ側である。このため、第２ピン３０の第２部分３０ｂが第２インナーカム溝４３内を移動する際に、第２インナーカム溝４３の側壁に衝突する可能性が低く、駆動に支障が生じる可能性が低い。 That is, even if the impact force F shown in FIG. 7 is applied to the second pin 30 and the second pin 30 bends, the bending direction is the camera body side with a wide gap D. Therefore, when the second portion 30b of the second pin 30 moves in the second inner cam groove 43, it is less likely to collide with the side wall of the second inner cam groove 43, which may hinder driving. Low.

（４）さらに本実施形態によると、光軸ＯＡを中心として周方向に延びる円周溝２５が設けられた前固定筒２４を備え、第２ピン３０は円周溝２５を貫通して第２インナーカム溝４３に係合し、第２ピン３０が第２インナーカム溝４３の外部に位置しているときも、第２ピン３０は円周溝２５の内部に位置している。
したがって、第２ピン３０は常に円周溝２５内に位置するので、第１カム筒２２の光軸ＯＡ方向の移動を確実に規制することができる。 (4) Further, according to the present embodiment, the front fixing cylinder 24 provided with the circumferential groove 25 extending in the circumferential direction about the optical axis OA is provided, and the second pin 30 penetrates the circumferential groove 25 and is second. The second pin 30 is also located inside the circumferential groove 25 when engaged with the inner cam groove 43 and the second pin 30 is located outside the second inner cam groove 43.
Therefore, since the second pin 30 is always located in the circumferential groove 25, the movement of the first cam cylinder 22 in the optical axis OA direction can be reliably regulated.

（５）第２ピン３０は、前固定筒２４の円周溝２５と係合する第１部分と、第２インナーカム溝４３内に配置される第２部分と、第１部分と第２部分との間に位置するとともに第１部分および第２部分よりも小径の小径部分を有する。 (5) The second pin 30 has a first portion that engages with the circumferential groove 25 of the front fixing cylinder 24, a second portion that is arranged in the second inner cam groove 43, and a first portion and a second portion. It is located between and has a smaller diameter portion with a smaller diameter than the first portion and the second portion.

本実施形態によると、第２ピン３０は、第２部分３０ｂに衝撃力Ｆが加わった場合、その力Ｆを第１部分３０ａで受ける。第１部分３０ａは前固定筒２４の円周溝２５の側壁で支えられているため、第２ピン３０の根本からの倒れを抑制できる。 According to the present embodiment, when an impact force F is applied to the second portion 30b, the second pin 30 receives the force F at the first portion 30a. Since the first portion 30a is supported by the side wall of the circumferential groove 25 of the front fixing cylinder 24, it is possible to prevent the second pin 30 from falling from the root.

また、第２部分３０ｂへ第２インナーカム溝４３の側壁が衝突して第２部分３０ｂがゆがんだ場合、その歪みによって小径部３０ｃが径を拡大する方向に変形する可能性がある。
この場合であっても、小径部３０ｃは第２部分３０ｂと第１部分３０ａよりも径が小さいため、小径部３０ｃの変形によって、第２ピン３０が第１レンズ移動筒４０の第１インナーカム溝４２に入らなくなる可能性が低い。 Further, when the side wall of the second inner cam groove 43 collides with the second portion 30b and the second portion 30b is distorted, the small diameter portion 30c may be deformed in the direction of increasing the diameter due to the distortion.
Even in this case, since the small diameter portion 30c has a smaller diameter than the second portion 30b and the first portion 30a, the second pin 30 becomes the first inner cam of the first lens moving cylinder 40 due to the deformation of the small diameter portion 30c. It is unlikely that it will not fit in the groove 42.

（６）本実施形態は、後固定筒２７と中固定筒２６とを連結させる固定リング１００を備える。
たとえば、比較形態として、中固定筒２６と後固定筒２７とを、光軸ＯＡに沿った方向に延びるビス等で止める場合、ヒスを回すドライバを光軸ＯＡと平行にして使用する必要がある。
この場合、ドライバを回すスペースが必要となるが、レンズ鏡筒１の場合は光軸ＯＡに沿ったスペースを確保することは難しい。
また、中固定筒２６と後固定筒２７とを光軸ＯＡに向かう方向（径方向）に延びるビス等で止める場合、ビスの頭が外径側に飛び出るため、レンズ鏡筒１の径が拡大される。 (6) The present embodiment includes a fixing ring 100 for connecting the rear fixing cylinder 27 and the middle fixing cylinder 26.
For example, as a comparative form, when the middle fixing cylinder 26 and the rear fixing cylinder 27 are fixed by a screw or the like extending in the direction along the optical axis OA, it is necessary to use a screwdriver for turning hiss in parallel with the optical axis OA. ..
In this case, a space for turning the driver is required, but in the case of the lens barrel 1, it is difficult to secure a space along the optical axis OA.
Further, when the middle fixing cylinder 26 and the rear fixing cylinder 27 are fixed by a screw or the like extending in the direction toward the optical axis OA (diameter direction), the head of the screw protrudes to the outer diameter side, so that the diameter of the lens barrel 1 is expanded. Will be done.

しかし、本実施形態によると、中固定筒２６と後固定筒２７とを固定する際に固定リング１００を用い、ドライバ等の道具を使用する必要がないため、そのためのスペースが必要ない。
また、ビスを用いないため、ビスの頭が径方向に飛び出すことがない。
さらに、固定リング１００一つによって光軸ＯＡに沿った方向と、光軸ＯＡに向かう方向への位置決めを行うことができる。 However, according to the present embodiment, when fixing the middle fixing cylinder 26 and the rear fixing cylinder 27, it is not necessary to use a fixing ring 100 and a tool such as a screwdriver, so that no space is required for that purpose.
Moreover, since no screw is used, the head of the screw does not protrude in the radial direction.
Further, one fixing ring 100 can be used for positioning along the optical axis OA and in the direction toward the optical axis OA.

Ｌ１：第１レンズ群、Ｌ２：第２レンズ群、Ｌ３：第３レンズ群、Ｌ４：第４レンズ群、ＯＡ：光軸、１：レンズ鏡筒、２：カメラボディ、１１：レンズ側マウント部、２０：ズーム操作リング、２１：ズーム連動キー、２２：第１カム筒、２３：第２カム筒、２４：前固定筒、２５：円周溝、２６：中固定筒、２６ａ：最外径、２７：後固定筒、２７ａ：後固定筒ねじ部、２７ｂ：側面、２７ｃ：拡大内径部、３０：第２ピン、３０ａ：第１部分、３０ｂ：第２部分、３０ｃ：小径部、３０ｄ：固定部、３１：１群直進ピン、３２：１群カムピン、４０：第１レンズ移動筒、４０ａ：端面、４１：インナー直進溝、４２：第１インナーカム溝、４３：第２インナーカム溝、４３ｃ：被写体側端面、４３ｄ：撮像面側端面、５１：第１移動枠、５２：第２移動枠、５３：第３移動枠、５４：第４移動枠、６１：フォーカスリング、１００：固定リング、１０１：円筒部、１０２：鍔部、１０３：内延部、１０４：固定リングねじ部、１０５：斜面 L1: 1st lens group, L2: 2nd lens group, L3: 3rd lens group, L4: 4th lens group, OA: optical axis, 1: lens barrel, 2: camera body, 11: lens side mount , 20: Zoom operation ring, 21: Zoom interlocking key, 22: 1st cam cylinder, 23: 2nd cam cylinder, 24: Front fixed cylinder, 25: Circumferential groove, 26: Medium fixed cylinder, 26a: Outermost diameter , 27: Rear fixed cylinder, 27a: Rear fixed cylinder screw part, 27b: Side surface, 27c: Enlarged inner diameter part, 30: Second pin, 30a: First part, 30b: Second part, 30c: Small diameter part, 30d: Fixed part, 31: 1 group straight pin, 32: 1 group cam pin, 40: 1st lens moving cylinder, 40a: end face, 41: inner straight groove, 42: 1st inner cam groove, 43: 2nd inner cam groove, 43c: Subject side end face, 43d: Imaging surface side end face, 51: First moving frame, 52: Second moving frame, 53: Third moving frame, 54: Fourth moving frame, 61: Focus ring, 100: Fixed ring , 101: Cylindrical part, 102: Lens part, 103: Inner extension part, 104: Fixing ring screw part, 105: Slope

Claims (8)

径方向に延びる第１突起および第２突起が設けられた第１筒と、
前記第１突起が係合する第１カム溝、および、前記第２突起が内部に位置することが可能な第２カム溝が設けられた第２筒と、
光軸を中心として周方向に延びて前記第２突起が内部に位置する周溝が設けられた第３筒と、を備え、
前記第１カム溝の一端の光軸方向に対する傾きは、他端の光軸に対する傾きよりも小さく、
前記第１突起が前記第１カム溝の前記一端に位置するとき、前記第２突起は前記第２カム溝の外部に位置し、
前記第２突起が前記第２カム溝の外部に位置しているときも、前記第２突起は前記周溝の内部に位置しているレンズ鏡筒。 A first cylinder provided with a first protrusion and a second protrusion extending in the radial direction,
A first cam groove with which the first protrusion engages, and a second cylinder provided with a second cam groove into which the second protrusion can be located.
A third cylinder having a circumferential groove extending in the circumferential direction about the optical axis and having the second protrusion located inside is provided.
The inclination of one end of the first cam groove with respect to the optical axis is smaller than the inclination of the other end with respect to the optical axis.
When the first protrusion is located at one end of the first cam groove, the second protrusion is located outside the second cam groove.
Even when the second protrusion is located outside the second cam groove, the second protrusion is a lens barrel located inside the peripheral groove. 請求項１に記載のレンズ鏡筒であって、
前記第２カム溝の長さは前記第１カム溝の長さより短いレンズ鏡筒。 The lens barrel according to claim 1.
The length of the second cam groove is shorter than the length of the first cam groove. 請求項１又は２に記載のレンズ鏡筒であって、
前記第１突起が前記第１カム溝の前記他端に位置するとき、前記第２突起は前記第２カム溝の内部に位置しているレンズ鏡筒。 The lens barrel according to claim 1 or 2.
When the first protrusion is located at the other end of the first cam groove, the second protrusion is a lens barrel located inside the second cam groove. 請求項１〜３のいずれか１項に記載のレンズ鏡筒であって、
前記第２カム溝内での前記第２突起の中心は、前記第２カム溝の前記光軸方向における中心よりも被写体側にオフセットした位置にあるレンズ鏡筒。 The lens barrel according to any one of claims 1 to 3.
The center of the second protrusion in the second cam groove is a lens barrel located at a position offset toward the subject from the center of the second cam groove in the optical axis direction. 請求項１に記載のレンズ鏡筒であって、
前記第３筒は、前記第１筒と前記第２筒の間に設けられ、前記第２突起は前記周溝を貫通しているレンズ鏡筒。 The lens barrel according to claim 1.
The third cylinder is a lens barrel provided between the first cylinder and the second cylinder, and the second protrusion penetrates the peripheral groove. 請求項１に記載のレンズ鏡筒であって、
前記第２突起は、前記第３筒の周溝内に位置する第１部分と、前記第２カム溝内に位置する第２部分と、前記第１部分と前記第２部分との間に位置するとともに前記第１部分および前記第２部分よりも小径の小径部分と、を有するレンズ鏡筒。 The lens barrel according to claim 1.
The second protrusion is located between the first portion located in the peripheral groove of the third cylinder, the second portion located in the second cam groove, and the first portion and the second portion. A lens barrel having the first portion and a smaller diameter portion having a diameter smaller than that of the second portion. 請求項１〜６のいずれか１項に記載のレンズ鏡筒であって、
前記第２筒は、前記第１筒の外周側に設けられ、前記第１突起および前記第２突起は、前記径方向の外側に延びているレンズ鏡筒。 The lens barrel according to any one of claims 1 to 6.
The second cylinder is provided on the outer peripheral side of the first cylinder, and the first protrusion and the second protrusion are lens barrels extending outward in the radial direction. 請求項１〜７のいずれか１項に記載のレンズ鏡筒を備えるカメラ。 A camera including the lens barrel according to any one of claims 1 to 7.
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