JP4603831B2 - Lens barrel and optical device - Google Patents

Lens barrel and optical device Download PDF

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JP4603831B2
JP4603831B2 JP2004221722A JP2004221722A JP4603831B2 JP 4603831 B2 JP4603831 B2 JP 4603831B2 JP 2004221722 A JP2004221722 A JP 2004221722A JP 2004221722 A JP2004221722 A JP 2004221722A JP 4603831 B2 JP4603831 B2 JP 4603831B2
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lens barrel
cam ring
barrel
conductive material
gear
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忠典 岡田
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Canon Inc
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Description

この発明は、フイルム装填カメラ、電子スチルカメラ、ビデオカメラなどのカメラに装備するレンズ鏡筒に関し、詳細には、レンズ鏡筒に生じた静電気がカメラ内の電子回路に誘導されることによって生ずる電子回路及び回路部品の誤動作、破壊を防止するようにしたレンズ鏡筒に係る。   The present invention relates to a lens barrel mounted on a camera such as a film-loading camera, an electronic still camera, or a video camera, and more specifically, an electron generated by static electricity generated in the lens barrel being guided to an electronic circuit in the camera. The present invention relates to a lens barrel that prevents malfunction and destruction of circuits and circuit components.

現今のカメラのレンズ鏡筒は、合成樹脂製の鏡筒枠を備えたものが多いが、鏡筒の外表面となる部分には補強、あるいは美観のために金属材からなるカバーが設けられている。レンズ鏡筒には撮影に際してカメラ本体の収納位置から撮影可能位置に繰り出されるもの、また、ズ−ミングによって進退移動するものなど各種のものがあり、金属製の外周面カバーを有するレンズ鏡筒がこのように繰り出されたり、進退移動すると、合成樹脂製のカメラ本体の一部や鏡筒枠部に接しながら摺動することから、この外周面カバーに静電気が発生することになる。   Many of today's camera lens barrels are equipped with a synthetic resin barrel frame, but the outer surface of the barrel is provided with a metal cover for reinforcement or aesthetics. Yes. There are various types of lens barrels, such as a lens barrel that is extended from the storage position of the camera body to a position where it can be photographed and a lens barrel that moves forward and backward by zooming. When it is extended or moved back and forth in this way, it slides in contact with a part of the synthetic resin camera body and the lens barrel frame, and static electricity is generated in the outer peripheral surface cover.

上記の他に静電気が発生する原因は様々であり、例えば、カメラを携帯して歩いている時などにレンズ鏡筒が衣服と接触を繰り返すことから、その外周面カバー及び前面カバーに静電気が発生する。   In addition to the above, there are various causes of static electricity. For example, when the camera is walking around with a camera, the lens barrel repeatedly comes into contact with clothes. To do.

一方、上記のように発生する静電気はカメラ本体やレンズ鏡筒に組込まれている電子回路や回路部品に対して静電誘導障害或いは電磁誘導障害を与える。すなわち、現今のカメラは高精度化された電子回路部品が多々組込まれているために、上記したような静電気による静電誘導や電磁誘導を受け易く、所定の電荷量以上の静電気が発生すると、電子回路や回路部品が誤動作し、延いては電子回路部品が破壊することがある。   On the other hand, the static electricity generated as described above causes an electrostatic induction failure or an electromagnetic induction failure to an electronic circuit or circuit component incorporated in the camera body or the lens barrel. In other words, the current camera has a lot of high-precision electronic circuit parts built in, so it is easy to receive electrostatic induction and electromagnetic induction due to static electricity as described above. An electronic circuit or a circuit component may malfunction, and eventually the electronic circuit component may be destroyed.

そこで、カメラのレンズ鏡筒に設けられた金属製の外周面カバーや前面カバーに生ずる静電気を確実に消失させ、静電気による電子回路に対する障害を防止するために、特許文献１あるいは特許文献２では、フレキシブルプリント基板で鏡筒前面部の金属リングと制御回路のグランドラインとを電気接続させている。
特開２００３−２１５４２５号公報 特開２００２−３５７７５７号公報 Therefore, in order to surely eliminate static electricity generated in the metal outer peripheral surface cover and the front cover provided in the lens barrel of the camera and prevent damage to the electronic circuit due to static electricity, in Patent Document 1 or Patent Document 2, A flexible printed circuit board electrically connects the metal ring on the front surface of the lens barrel and the ground line of the control circuit.
JP 2003-215425 A JP 2002-357757 A

上記従来例では、外装の金属部分に電気的な接続をするためにフレキシブルプリント基板等の配線部品を有するために、装置が複雑、かつ大型化しやすいという問題がある。   In the above conventional example, since wiring components such as a flexible printed board are provided for electrical connection to the metal part of the exterior, there is a problem that the apparatus is complicated and tends to be large.

本発明は上記した実情に鑑み、簡単な構造でカメラのレンズ鏡筒外装部品に生ずる静電気を確実に消失させ、静電気による電子回路に対する障害を防止したレンズ鏡筒を提供することを目的とする。   SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lens barrel in which static electricity generated in a lens barrel exterior part of a camera is eliminated with a simple structure and an electronic circuit is prevented from being damaged by static electricity.

上記目的を達成するために、本発明では、外装でありかつレンズを保持し非導電材料からなる移動鏡筒と、前記移動鏡筒の外周に一体的に取付けられた第１の金属ピンと、外装でありかつ内周に前記第１の金属ピンが係合する第１のカム溝を有し導電材料からなるカム環と、前記カム環の外周に一体的に取付けられた第２の金属ピンと、内周に前記第２の金属ピンが係合する第２のカム溝を有し非導電材料からなる固定鏡筒を備えたレンズ鏡筒において、
前記移動鏡筒及び前記カム環は、前記カム環の回転により光軸方向に進退する構造となっており、
前記固定鏡筒の第２のカム溝には電気的に導通作用を有する導電性塗料が塗布され、前記カム環は前記第２の金属ピン及び前記導電性塗料を介して制御回路の安定電源部に電気的に接続されていることを特徴とする。 In order to achieve the above object, in the present invention, a movable lens barrel that is an exterior and holds a lens and is made of a nonconductive material, a first metal pin that is integrally attached to the outer periphery of the movable barrel, and an exterior And a cam ring made of a conductive material having a first cam groove engaged with the first metal pin on the inner periphery, and a second metal pin integrally attached to the outer periphery of the cam ring , in the second lens barrel including a main barrel made of a non-conductive material has a cam groove in which the second metal pin on the inner periphery is engaged,
The movable lens barrel and the cam ring are structured to advance and retract in the optical axis direction by rotation of the cam ring,
A conductive paint having electrical conductivity is applied to the second cam groove of the fixed barrel, and the cam ring is connected to the stable power supply unit of the control circuit via the second metal pin and the conductive paint. It is electrically connected to.

また、第二の発明では、更に、前記カム環に一体的に取付けられた導電材料からなるギアと、前記ギアが噛合し、少なくとも１つが導電材料からなるギア列と、前記ギア列を介して前記カム環を駆動する駆動源と、前記導電性材料からなるギアを回転自由に支持する金属製の軸を備え、前記カム環は、前記導電材料からなるギア及び前記軸を介して制御回路の安定電源部に電気的に接続されていることを特徴とする。 Further, in the second invention, further, a gear made of a conductive material integrally attached to the cam ring, the gear meshes, the gear train at least one is made of a conductive material, through the gear train A drive source for driving the cam ring and a metal shaft that rotatably supports the gear made of the conductive material, and the cam ring is connected to the gear made of the conductive material and the shaft through the shaft. It is characterized in that it is electrically connected to a stable power supply unit.

以上説明したように本発明では、外装であり、かつ光軸方向に進退する導電材料からなる外装部材と、前記外装部材に一体的に取付けられた金属ピンと、前記金属ピンが係合するカム溝を有し非導電材料からなる固定鏡筒を備えたレンズ鏡筒において、前記固定鏡筒のカム溝には電気的に導通作用を有する導電性塗料が塗布され、前記外装部材は金属ピン及び導電性塗料を介して制御回路の安定電源部に電気的に接続されていることを特徴とする。よって、新たに配線部品を設けることなく、簡単な構成で発生した静電気を放出し電子部品を保護することができる。   As described above, according to the present invention, the exterior member is an exterior member made of a conductive material that advances and retreats in the optical axis direction, the metal pin integrally attached to the exterior member, and the cam groove with which the metal pin engages. In the lens barrel having a fixed barrel made of a non-conductive material, the cam groove of the fixed barrel is coated with a conductive paint having an electrically conductive action, and the exterior member is made of a metal pin and a conductive layer. It is electrically connected to a stable power supply part of the control circuit through a conductive paint. Therefore, it is possible to protect the electronic component by discharging static electricity generated with a simple configuration without providing a new wiring component.

また、第二の発明では、外装かつ光軸周りに回動し、導電材料からなる外装部材と、前記外装部材に一体的に取付けられたギアと、前記ギアが噛合し、少なくともひとつは導電材料からなるギア列と、前記ギア列を介して前記外装部材を駆動する駆動源とを備えたレンズ鏡筒において、前記導電性材料からなるギアを回転自由に支持する金属製の軸を有し、前記外装部材は導電材料からなるギア及び軸を介して制御回路の安定電源部に電気的に接続されていることを特徴とする。よって、駆動手段の一部を導電材料で構成することにより、新たに配線部品を設けることなく、簡単な構成で発生した静電気を放出し電子部品を保護することができる。   Further, in the second invention, the exterior member, which rotates around the optical axis and is made of a conductive material, the gear integrally attached to the exterior member, and the gear mesh with each other, at least one of which is a conductive material. A lens barrel having a gear train comprising: and a drive source that drives the exterior member via the gear train; and a metal shaft that rotatably supports the gear made of the conductive material, The exterior member is electrically connected to a stable power supply unit of a control circuit through a gear and a shaft made of a conductive material. Therefore, by configuring a part of the driving means with a conductive material, it is possible to discharge the static electricity generated with a simple configuration and protect the electronic component without providing a new wiring component.

次に、本発明の実施形態について図面に沿って説明する。図１は、一実施形態として示したカメラのズ−ムレンズ鏡筒の断面図、図２は主要構成部品を示した分解斜視図である。   Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a zoom lens barrel of a camera shown as an embodiment, and FIG. 2 is an exploded perspective view showing main components.

図において、１は第一群レンズL1を保持した1群鏡筒を示し、プラスチック樹脂によって成形されている。1群鏡筒１は先端に有効光線の制限、及び外観向上のためのマスク１ａが取付けられ、その外側には補強及び外観向上の目的で金属リング１ｂが接着固定されている。後部外周には金属のピン１ｃが３本周方向等分に植設されている。２はカム環を示し、カーボン繊維を含有した樹脂で成形されている。内周には1群鏡筒１のピン１ｃが係合する１群カム２ａが形成されている。カム環２の外周には金属のピン２ｂが圧入固定されており、ピン２ｂは固定鏡筒３の内周に成形された固定カム３ａに係合している。よって、カム環２は光軸周りに回転することによって光軸方向に移動する。   In the figure, reference numeral 1 denotes a first group barrel holding a first group lens L1, which is formed of plastic resin. A mask 1a for limiting the effective ray and improving the appearance is attached to the front end of the first group barrel 1 and a metal ring 1b is bonded and fixed to the outside for the purpose of reinforcement and appearance improvement. Three metal pins 1c are implanted on the outer periphery of the rear part equally in the circumferential direction. Reference numeral 2 denotes a cam ring, which is molded from a resin containing carbon fibers. A first group cam 2a with which the pin 1c of the first group barrel 1 is engaged is formed on the inner periphery. A metal pin 2 b is press-fitted and fixed to the outer periphery of the cam ring 2, and the pin 2 b is engaged with a fixed cam 3 a formed on the inner periphery of the fixed barrel 3. Therefore, the cam ring 2 moves in the optical axis direction by rotating around the optical axis.

カム環２の内周には、直進筒４が回転自由に保持されており、先端の突起４ａがカム環２の周溝２ｈ内を摺動する、所謂バヨネット構造になっており、カム環２内で回転自由に保持されたまま、カム環２と一体で光軸方向に移動する。   A rectilinear cylinder 4 is rotatably held on the inner periphery of the cam ring 2, and has a so-called bayonet structure in which a protrusion 4 a at the tip slides in a circumferential groove 2 h of the cam ring 2. The cam ring 2 moves integrally with the cam ring 2 while being held freely rotated.

直進筒４の外周にはキー部４ｂが３箇所設けられており、固定鏡筒３の内周に形成された直進溝３ｂに係合することによって回転が制限されるため、結果として、直進筒４は回転することなくカム環２の光軸方向の移動とともに直進移動を行う。   Three key portions 4b are provided on the outer periphery of the rectilinear cylinder 4, and the rotation is restricted by engaging with the rectilinear groove 3b formed on the inner periphery of the fixed barrel 3. As a result, the rectilinear cylinder 4 moves straight along with the movement of the cam ring 2 in the optical axis direction without rotating.

直進筒４には直進溝４ｃが設けられ、１群鏡筒１のピン座１ｄが係合している。従って、１群鏡筒１はカム環２の回転によって、固定カム３ａとカム環２の内周の、１群カム２ａの合成された分だけ光軸方向に直進移動することになる。   The rectilinear cylinder 4 is provided with a rectilinear groove 4c, and the pin seat 1d of the first group barrel 1 is engaged. Therefore, the first group barrel 1 moves straight in the direction of the optical axis by the amount of the first cam group 2a synthesized on the inner periphery of the fixed cam 3a and the cam ring 2 by the rotation of the cam ring 2.

５は第二群レンズL２を保持した２群鏡筒、６は第三群レンズＬ３を保持した３群鏡筒を示し、それぞれ金属のピン５ａ、６ａが固定されている。ピン５ａ、６ａはカム環２の内周に設けた２群カム２ｄ、３群カム２ｅに係合し、ピン座５ｂ、６ｂが直進筒４の直進溝４ｃ、４ｅに係合することによって、２群鏡筒５、３群鏡筒６、及び１群鏡筒１は所定の関係をもって光軸方向に移動することになる。   Reference numeral 5 denotes a second group barrel holding the second group lens L2, and reference numeral 6 denotes a third group barrel holding the third group lens L3, to which metal pins 5a and 6a are fixed, respectively. The pins 5a and 6a are engaged with the second group cam 2d and the third group cam 2e provided on the inner periphery of the cam ring 2, and the pin seats 5b and 6b are engaged with the rectilinear grooves 4c and 4e of the rectilinear cylinder 4. The second group barrel 5, the third group barrel 6, and the first group barrel 1 move in the optical axis direction with a predetermined relationship.

７は絞りユニットを示し、３群鏡筒６にビスによって固定され、３群鏡筒６と一体的に光軸方向に移動する。   Reference numeral 7 denotes an aperture unit, which is fixed to the third group barrel 6 with screws and moves integrally with the third group barrel 6 in the optical axis direction.

８は第４群レンズＬ４を保持した４群鏡筒を示し、ステップモータ９によって光軸方向に駆動され、フォーカス調整を行う、ステップモータによる駆動機構は周知のものなので詳細な説明は省略する。   Reference numeral 8 denotes a fourth group lens barrel that holds the fourth group lens L4, and is driven in the direction of the optical axis by the step motor 9 to adjust the focus.

10はカム環２をズーミングのため回転駆動するためのズームモータユニットを示し、ステップモータ10ａ、ギア列10ｂ、及びケース10ｃによって構成されており、ケース10ｃが固定鏡筒３の台座３ｅにビスによって固定されている。   Reference numeral 10 denotes a zoom motor unit for rotationally driving the cam ring 2 for zooming. The zoom motor unit 10 includes a step motor 10a, a gear train 10b, and a case 10c. The case 10c is attached to the base 3e of the fixed barrel 3 with screws. It is fixed.

ズームモータユニット10の出力ギア10ｄは、長歯ギア11に噛合しており、長歯ギア11は金属シャフト12の周りを回転自由に保持されている。金属シャフト12は先端を固定鏡筒の軸穴３ｆ、他端をＣＣＤホルダ13の軸穴13ａによって保持されている。ＣＣＤホルダ13は撮像素子であるＣＣＤを後部に保持し、各レンズ鏡筒や他の部品を組み込んだ後、固定鏡筒３とビスによって固定される。   An output gear 10d of the zoom motor unit 10 meshes with a long tooth gear 11, and the long tooth gear 11 is rotatably held around a metal shaft 12. The metal shaft 12 is held at its tip by a shaft hole 3 f of the fixed barrel and at the other end by a shaft hole 13 a of the CCD holder 13. The CCD holder 13 holds the CCD, which is an image sensor, at the rear, and after each lens barrel and other parts are assembled, it is fixed to the fixed barrel 3 with screws.

一方カム環２の外周にはギア部２ｆが成形されており、長歯ギア12に噛合することによって、ズームモータユニットの駆動力がカム環２に伝達される。長歯ギア11には、カム環２が回転によって光軸方向に移動しても安定した噛合が保たれる分の歯の長さが確保されている。   On the other hand, a gear portion 2 f is formed on the outer periphery of the cam ring 2, and the driving force of the zoom motor unit is transmitted to the cam ring 2 by meshing with the long tooth gear 12. The long tooth gear 11 has a tooth length sufficient to maintain stable meshing even when the cam ring 2 moves in the optical axis direction by rotation.

14はカム環２の回転位置を検出するためのセンサで、投受光素子の間にカム環２にも受けた遮光壁２ｇが挿入されることによって所定の電圧変化が出力される、フォトインタラプタによって構成されている。センサ14は直進筒４に固定されており、ズーミングにより光軸方向に直進移動を行う。センサ14はフレキシブルプリント基板15によって電源及び出力信号がカメラ本体の制御基板と電気接続されており、屈曲部15ａが直進筒４の移動を吸収することで安定した電気接続が維持される。   14 is a sensor for detecting the rotational position of the cam ring 2, and a predetermined voltage change is output by inserting a light shielding wall 2g also received by the cam ring 2 between the light projecting and receiving elements. It is configured. The sensor 14 is fixed to the rectilinear cylinder 4 and moves linearly in the optical axis direction by zooming. The sensor 14 has a power supply and an output signal electrically connected to the control board of the camera body by the flexible printed circuit board 15, and the bending portion 15 a absorbs the movement of the rectilinear cylinder 4 to maintain a stable electrical connection.

次に本発明に係わる静電気の放出構造について説明する。   Next, the structure for discharging static electricity according to the present invention will be described.

近年のデジタルカメラの普及に伴い、カメラは高精度化された電子回路部品が多々組込まれているために、外部からの静電気による静電誘導や電磁誘導を受け易く、所定の電荷量以上の静電気が発生すると、電子回路や回路部品が誤動作し、延いては電子回路部品が破壊することがある。   With the spread of digital cameras in recent years, since many highly accurate electronic circuit parts are incorporated in the camera, it is easy to receive electrostatic induction and electromagnetic induction due to external static electricity. If this occurs, the electronic circuit or circuit component may malfunction, and eventually the electronic circuit component may be destroyed.

一方ではコンパクト化、軽量化が求められ、樹脂成形の部品が多用されるようになってきている。また、樹脂にカーボン繊維を混入し外部からの衝撃に対して強度上の信頼性を向上させたものも多くなってきている。   On the other hand, downsizing and weight reduction are required, and resin molded parts are used frequently. In addition, carbon fibers are mixed into the resin to improve the reliability in strength against external impacts.

しかしながら、カーボンを含有した樹脂は電気を通しやすい性質があり、金属部品はもちろん、カーボン材の近くにある電子部品も静電気による誤動作、あるいは破損の危険性がある。そのため、そのような不具合を防止するために、静電気の放出手段を設ける必要がある。たとえば外装部品をすべてカーボン含有材料によって構成すれば良いが、通常使用されているガラス繊維含有材料に比べて、数倍のコストがかかるため、製品のコストアップにつながってしまうという問題がある。   However, a resin containing carbon has a property of easily conducting electricity, and not only metal parts but also electronic parts near the carbon material have a risk of malfunction or damage due to static electricity. Therefore, in order to prevent such a problem, it is necessary to provide a means for discharging static electricity. For example, all exterior parts may be made of a carbon-containing material. However, since the cost is several times higher than that of a glass fiber-containing material that is normally used, there is a problem that the cost of the product is increased.

図３は本実施例の静電気の導通経路を示す、要部詳細図である。固定鏡筒３の内周には図中太線で示す部分に導電性の塗料20が塗布されている。塗料の材料としては、銅を含むものでも良いし、内壁の反射等による光学的影響を防止するために、黒色のカーボン含有塗料でも良い。それによってカーボン材で成形されたカム環２に伝わった静電気は、金属ピン２ａ、導電塗装20を伝わって、補強リング３ｇに伝達される。補強リング３ｇはカメラ本体の金属の外装部品30に圧設されており、そこから静電気が放出される。また、外装部品30はカメラ本体に設け電子回路のグランラインに電気的に接続されている。   FIG. 3 is a detailed view of a main part showing a static electricity conduction path of this embodiment. A conductive paint 20 is applied to the inner periphery of the fixed barrel 3 in the portion indicated by the thick line in the figure. The material of the paint may include copper, or may be a black carbon-containing paint in order to prevent optical influence due to reflection of the inner wall. Thereby, the static electricity transmitted to the cam ring 2 formed of the carbon material is transmitted to the reinforcing ring 3g through the metal pin 2a and the conductive coating 20. The reinforcing ring 3g is press-fitted to the metal exterior part 30 of the camera body, and static electricity is discharged therefrom. The exterior component 30 is provided in the camera body and is electrically connected to a grand line of an electronic circuit.

本実施例のように、カム環２の近傍にセンサ14がある場合でも、すべての部品を高価なカーボン材で構成する必要なく、電子部品を静電気から保護することができる。また、リード線などの配線部品を新たに設けることもないので、簡単な構成で、コンパクトかつ安価なカメラを実現することができる。   Even in the case where the sensor 14 is in the vicinity of the cam ring 2 as in this embodiment, it is possible to protect the electronic components from static electricity without having to configure all the components with expensive carbon materials. In addition, since wiring components such as lead wires are not newly provided, a compact and inexpensive camera can be realized with a simple configuration.

（他の実施例）
図４は本発明に係わる他の実施例を示し、第一の実施例の導電構造の代わりに実施することも、第一の実施例に加えて実施することも可能である。 (Other examples)
FIG. 4 shows another embodiment according to the present invention, which can be implemented in place of the conductive structure of the first embodiment or can be implemented in addition to the first embodiment.

図において、長歯ギア11は金属で構成されており、金属シャフト12の先端は、カメラ本体の金属製外装部品30に板バネ31を介して常に接触している。従って、カム環２に発生しした静電気は、ギア部２ｆから長歯ギア11、金属シャフト12、板バネ31を介して外装部品に導電され外部に放出される。長歯ギア11の材質は金属だけでなく、導電性、摺動性を考慮し、たとえばカーボン含有のポリアセタール樹脂でも可能である。   In the figure, the long tooth gear 11 is made of metal, and the tip of the metal shaft 12 is always in contact with the metal exterior part 30 of the camera body via the leaf spring 31. Accordingly, the static electricity generated in the cam ring 2 is conducted from the gear portion 2f to the exterior parts via the long tooth gear 11, the metal shaft 12, and the leaf spring 31, and is discharged to the outside. The material of the long tooth gear 11 is not limited to metal, and can be made of, for example, carbon-containing polyacetal resin in consideration of conductivity and slidability.

以上説明したように、本発明によれば、安価でコンパクトな構成を保ったまま電子部品を静電気から保護し、信頼性の高い装置を実現できるものである。   As described above, according to the present invention, an electronic component can be protected from static electricity while maintaining an inexpensive and compact configuration, and a highly reliable device can be realized.

実施例ではデジタルカメラに使用するレンズについて説明したが、ビデオレンズや銀塩フィルムに撮影する一眼レフ、コンパクトカメラに採用することも同様な効果を奏する。   Although the lens used in the digital camera has been described in the embodiments, the same effect can be obtained by adopting a video lens, a single-lens reflex camera for photographing on a silver salt film, and a compact camera.

本発明を実施したレンズ鏡筒の断面図Sectional view of a lens barrel embodying the present invention 主要構成部品を示した分解斜視図Exploded perspective view showing the main components 図１のレンズ鏡筒の要部詳細図Detailed view of the main part of the lens barrel of FIG. 本発明の他の実施例を示す断面図Sectional drawing which shows the other Example of this invention

符号の説明Explanation of symbols

２ カム環
２ａ 金属ピン
３ 固定鏡筒
４ 直進筒
11 長歯ギア
12 金属シャフト
20 導電塗料
30 カメラ外装部品
31 板バネ 2 Cam ring 2a Metal pin 3 Fixed lens barrel 4 Straight tube
11 Long gear
12 Metal shaft
20 Conductive paint
30 Camera exterior parts
31 Leaf spring

Claims (3)

外装でありかつレンズを保持し非導電材料からなる移動鏡筒と、前記移動鏡筒の外周に一体的に取付けられた第１の金属ピンと、外装でありかつ内周に前記第１の金属ピンが係合する第１のカム溝を有し導電材料からなるカム環と、前記カム環の外周に一体的に取付けられた第２の金属ピンと、内周に前記第２の金属ピンが係合する第２のカム溝を有し非導電材料からなる固定鏡筒を備えたレンズ鏡筒において、
前記移動鏡筒及び前記カム環は、前記カム環の回転により光軸方向に進退する構造となっており、
前記固定鏡筒の第２のカム溝には電気的に導通作用を有する導電性塗料が塗布され、前記カム環は前記第２の金属ピン及び前記導電性塗料を介して制御回路の安定電源部に電気的に接続されていることを特徴とするレンズ鏡筒。 A moving barrel made of a non-conductive material that is an exterior and holds a lens, a first metal pin integrally attached to the outer periphery of the movable barrel, and the first metal pin that is an exterior and is located on the inner circumference a cam ring but made of a conductive material having a first cam groove that engages, and a second metal pin integrally attached to the outer periphery of the cam ring, the the inner peripheral second metal pin is engaged In a lens barrel having a second cam groove and a fixed barrel made of a non-conductive material,
The movable lens barrel and the cam ring are structured to advance and retract in the optical axis direction by rotation of the cam ring,
A conductive paint having electrical conductivity is applied to the second cam groove of the fixed barrel, and the cam ring is connected to the stable power supply unit of the control circuit via the second metal pin and the conductive paint. A lens barrel electrically connected to the lens barrel. 更に、前記カム環に一体的に取付けられた導電材料からなるギアと、前記ギアが噛合し、少なくとも１つが導電材料からなるギア列と、前記ギア列を介して前記カム環を駆動する駆動源と、前記導電性材料からなるギアを回転自由に支持する金属製の軸を備え、前記カム環は、前記導電材料からなるギア及び前記軸を介して制御回路の安定電源部に電気的に接続されていることを特徴とする請求項１に記載のレンズ鏡筒。 Further, a gear made of a conductive material integrally attached to the cam ring, the gear meshes, the gear train at least one is made of a conductive material, a driving source for driving the cam ring via the gear train And a metal shaft that rotatably supports the gear made of the conductive material, and the cam ring is electrically connected to the stable power supply unit of the control circuit via the gear made of the conductive material and the shaft. The lens barrel according to claim 1, wherein the lens barrel is formed. 請求項１または２に記載のレンズ鏡筒と、前記レンズ鏡筒が設けられたカメラ本体と、を有することを特徴とする光学装置。   3. An optical apparatus comprising: the lens barrel according to claim 1; and a camera body provided with the lens barrel.
JP2004221722A 2004-07-29 2004-07-29 Lens barrel and optical device Expired - Fee Related JP4603831B2 (en)

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JP2013178340A (en) * 2012-02-28 2013-09-09 Nikon Corp Lens barrel and imaging apparatus
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JP7305331B2 (en) 2018-10-31 2023-07-10 キヤノン株式会社 LENS DEVICE AND CAMERA SYSTEM USING THE SAME

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JP2001337260A (en) * 2000-05-25 2001-12-07 Canon Inc Image pickup device
JP2003238820A (en) * 2002-02-20 2003-08-27 Nidec Copal Corp Antistatic resin material for optical instrument
JP2004104168A (en) * 2002-09-04 2004-04-02 Canon Inc Imaging apparatus and imaging system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001337260A (en) * 2000-05-25 2001-12-07 Canon Inc Image pickup device
JP2003238820A (en) * 2002-02-20 2003-08-27 Nidec Copal Corp Antistatic resin material for optical instrument
JP2004104168A (en) * 2002-09-04 2004-04-02 Canon Inc Imaging apparatus and imaging system

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