JPH01196012A - Lens barrel - Google Patents
Lens barrelInfo
- Publication number
- JPH01196012A JPH01196012A JP2065588A JP2065588A JPH01196012A JP H01196012 A JPH01196012 A JP H01196012A JP 2065588 A JP2065588 A JP 2065588A JP 2065588 A JP2065588 A JP 2065588A JP H01196012 A JPH01196012 A JP H01196012A
- Authority
- JP
- Japan
- Prior art keywords
- lens barrel
- movable
- movable electrode
- fixed
- lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000002093 peripheral effect Effects 0.000 abstract description 8
- 230000003287 optical effect Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 7
- 239000012212 insulator Substances 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Lens Barrels (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、カメラのレンズｌｌ筒、とくに、可動レンズ
の位置検出機構に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a camera lens barrel, particularly to a position detection mechanism for a movable lens.
（従来の技術）
カメラにおいては、オートフォーカスなどの自動化に伴
い、可動レンズの位置を検出する装置が組込まれる。従
来、この種の装置としては、たとえば、特開昭６２−２
６２００９号公報に示されるように、固定レンズ筒に一
対の固定電極を軸方向に隣接して設けるとともに、軸方
向に進退する可動レンズ簡に上記一対の固定電極に間隙
をおいて対向する可動電極を設けて一対の可変コンデン
サを形成し、この一対の可変コンデンサの静電容量の変
化による差分を検出して、可動レンズ筒すなわち可動レ
ンズの位置を検出するものが知られている。(Prior Art) In cameras, a device for detecting the position of a movable lens is incorporated with automation of autofocus and the like. Conventionally, as this type of device, for example, Japanese Patent Application Laid-Open No. 62-2
As shown in Japanese Patent No. 62009, a pair of fixed electrodes are provided adjacent to each other in the axial direction on a fixed lens barrel, and a movable lens that moves back and forth in the axial direction is provided with a movable electrode that faces the pair of fixed electrodes with a gap between them. It is known to provide a pair of variable capacitors, and to detect a difference due to a change in capacitance between the pair of variable capacitors, thereby detecting the position of a movable lens barrel, that is, a movable lens.
（発明が解決しようとする課題）
上記の装置においては、可動電極の信号を外部の信号処
理回路まで導き出す構造になお問題がある。すなわち、
可動電極に信号出力線で結線したような場合、可動電極
が一対の固定電極に対して奥まで侵入したとき、信号出
力線が可動電極となって誤差を含む信号が発生し、また
、浮遊容量のために可動電極からの本当の信号成分がノ
イズに埋もれてしまうことがあり、正確な信号が検出で
きない。(Problems to be Solved by the Invention) In the above device, there is still a problem in the structure for leading the signal of the movable electrode to an external signal processing circuit. That is,
In the case where a signal output line is connected to a movable electrode, when the movable electrode penetrates deep into a pair of fixed electrodes, the signal output line becomes a movable electrode, generating a signal containing an error, and stray capacitance. Therefore, the real signal component from the movable electrode may be buried in noise, making it impossible to detect an accurate signal.
本発明は、可動電極を誤差出力のきわめて少ない状態で
容易に接続できるようにすることを目的とするものであ
る。An object of the present invention is to enable easy connection of movable electrodes with extremely little error output.
（課題を解決するための手段）
本発明は、固定レンズ筒と、この固定レンズ筒に対して
軸方向進退自在に設けられた可動レンズ筒と、上記固定
レンズ筒に一対の固定電極を軸方向に隣接して設けると
ともに、上記可動レンズ簡に上記一対の固定電極に間隙
をおいて対向する可動′Ｆ１１ｔｉを設けた可動レンズ
位置検出用のセンサとを備えたレンズ鏡筒において、上
記可動レンズ筒の軸方向に溝を形成し、この溝に上記可
動電極に接続された信号出力用の導電片を設けたもので
ある。(Means for Solving the Problems) The present invention provides a fixed lens barrel, a movable lens barrel that is provided to be able to move forward and backward in the axial direction with respect to the fixed lens barrel, and a pair of fixed electrodes that are attached to the fixed lens barrel in the axial direction. and a sensor for detecting the position of the movable lens provided with a movable lens F11ti arranged adjacent to the movable lens and facing the pair of fixed electrodes with a gap, the movable lens barrel A groove is formed in the axial direction of the movable electrode, and a conductive piece for signal output connected to the movable electrode is provided in this groove.
また、本発明は、上記レンズａ筒において、可動レンズ
筒に駆動用のモータと結合する連結部を設け、この連結
部に可動電極からのｌＪ導電片接続した増幅器を設けた
ものである。Further, in the present invention, in the lens a-tube, the movable lens barrel is provided with a connecting portion for coupling with a driving motor, and an amplifier to which the lJ conductive piece from the movable electrode is connected is provided to this connecting portion.
（作用）
本発明は、可動レンズ筒を軸方向に進退させると、セン
サを構成する一対の固定電極に対する可動電極の対向面
積が変化し、これによって、固定電極と可動電極からな
る一対の可変コンデンサの静電容量が変化し、この静電
容量の変化による差分によって可動レンズ筒の変位量、
すなわち、可動レンズの位置を検出する。(Function) According to the present invention, when the movable lens barrel is moved back and forth in the axial direction, the opposing area of the movable electrode with respect to the pair of fixed electrodes constituting the sensor changes. The capacitance changes, and the displacement of the movable lens barrel is determined by the difference due to the change in capacitance.
That is, the position of the movable lens is detected.
そして、この際、固定電極と可動電極との対向間隔より
も、可動電極の溝に設けた導電片と固定電極との対向間
隔の方が大きい。そして、一般に、静電容量は電極間距
離の二乗に反比例するため、可動電極に生ずる信号に比
し、導電片に生ずる誤信号はきわめて小さくなる。した
がって、可動電極の出力線が固定電極の一方の影響を受
けて誤信号が出力されることはない。At this time, the facing distance between the conductive piece provided in the groove of the movable electrode and the fixed electrode is larger than the facing distance between the fixed electrode and the movable electrode. Since capacitance is generally inversely proportional to the square of the distance between the electrodes, the erroneous signal generated at the conductive piece is extremely small compared to the signal generated at the movable electrode. Therefore, the output line of the movable electrode will not be affected by one of the fixed electrodes and an erroneous signal will not be output.
また、可動電極で得られた検出信号を連結部に設けた増
幅器で増幅して、レンズ鏡筒の外部に取出すので、検出
信号はレンズ鏡筒内部でインピーダンス変換され、それ
以後の電気回路はレンズ鏡筒の外部に出ても外乱ノイズ
に影響されない。In addition, the detection signal obtained by the movable electrode is amplified by an amplifier installed in the connecting part and taken out to the outside of the lens barrel, so the detection signal is impedance converted inside the lens barrel, and the electric circuit after that is connected to the lens. It is not affected by external noise even if it goes outside the lens barrel.
（実施例） 以下、本発明の一実施例を図面を参照して説明する。(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図において、１は円筒状の基筒で、この基筒１の後
部にカメラ本体にアダプタ等を介して接続する支持部２
が設けられているとともに、基筒１の前部に円筒状の固
定レンズ筒３を介して円筒状の鏡筒本体４が取付けられ
ている。この鏡筒本体４内の前部に第１群レンズ枠５を
介して第１、第２、第３レンズＬ１．Ｌ２ 、Ｌ３から
なる第１群レンズが設けられているとともに、鏡筒本体
４内に第２群レンズ枠６を介して第４、第５、第６レン
ズＬ４．Ｌ５．Ｌ６からなる第２群レンズ、および、第
３群レンズ枠７を介して第７レンズＬ７からなる第３群
レンズがそれぞれ軸方向進退可能に設けられている。す
なわち、上記第２群レンズ枠６および第３群レンズ枠７
は鏡筒本体４内の上下部に平行に設けた複数本のガイド
軸８に進退自在に支持されているとともに、第２群レン
ズ枠６および第３群レンズ枠７の上部に係合子９゜１０
が突設され、この各係合子９．１０が上記鏡筒本体４内
に同心的に回動自在に設けた円筒状のカム筒１１の各カ
ム溝に係合され、このカム筒１１の上部に鏡筒本体４の
周方向の開口溝１２から突出した係合子１３が突設され
、この係合子１３が、上記鏡筒本体４の後方外周部に回
動自在に設けた円筒状のズーム環１４に３１枯されてい
る。In FIG. 1, reference numeral 1 denotes a cylindrical base barrel, and a support part 2 is connected to the rear of the base barrel 1 via an adapter or the like to the camera body.
A cylindrical lens barrel main body 4 is attached to the front part of the base barrel 1 via a cylindrical fixed lens barrel 3. The first, second, third lenses L1. A first lens group consisting of L2, L3 is provided, and fourth, fifth, sixth lenses L4, . L5. A second group lens consisting of L6 and a third group lens consisting of a seventh lens L7 are provided so as to be movable in the axial direction via the third group lens frame 7. That is, the second group lens frame 6 and the third group lens frame 7
is supported by a plurality of guide shafts 8 provided parallel to the upper and lower parts of the lens barrel body 4 so as to be able to move forward and backward, and an engaging element 9° is provided at the upper part of the second group lens frame 6 and the third group lens frame 7. 10
are provided in a protruding manner, and each of these engaging elements 9 and 10 is engaged with each cam groove of a cylindrical cam barrel 11 that is rotatably provided concentrically within the lens barrel main body 4, and the upper part of this cam barrel 11 is An engaging element 13 protrudes from an opening groove 12 in the circumferential direction of the lens barrel main body 4, and this engaging element 13 connects to a cylindrical zoom ring rotatably provided on the rear outer circumference of the lens barrel main body 4. 31 withered in 14th.
そして、ズーム環１４を回動すると、係合子１３を介し
てカム筒１１が回動し、そのカム溝と係合した係合子９
，１０を介して第２群レンズ枠６および第３群レンズ枠
７がガイド軸８に沿って軸方向に進退し、第２群および
第３群のレンズし４〜Ｌ７を進退するようになっている
。Then, when the zoom ring 14 is rotated, the cam cylinder 11 is rotated via the engager 13, and the engager 9 engages with the cam groove.
, 10, the second group lens frame 6 and the third group lens frame 7 advance and retreat in the axial direction along the guide shaft 8, and the lenses of the second and third groups 4 to L7 advance and retreat. ing.
また、上記鏡筒本体４内の後部に第４群レンズ枠１５を
介して、第８、第９レンズＬ８．Ｌ９からなる第４群レ
ンズが設けられている。Further, the eighth and ninth lenses L8. A fourth lens group consisting of L9 is provided.
上記基筒１の前部の固定レンズ筒３に第５群レンズ枠１
６を介して第１０、第１ルンズし１０゜Ｌ １１からな
る第５群レンズが設けられている。また、上記基筒１内
において上記固定レンズ筒３内に対して第６群レンズ枠
としての可動レンズ筒１７が軸方向進退自在に設けられ
、この可動レンズ筒１７に第１２、第１３、第１４レン
ズＬ１２．Ｌｌ３゜Ｌ１４からなる第６群レンズが設け
られている。すなわち、可動レンズ筒１７は上記基筒１
内に設けたガイド軸１８により固定レンズ筒３内に対し
て進退自在に支持されているとともに、可動レンズｆｌ
ｌ１７の上部に連結部１９が突設されている。A fifth group lens frame 1 is attached to the fixed lens barrel 3 at the front of the base barrel 1.
A fifth lens group consisting of a 10.degree. L lens and a 10.degree. L. A movable lens barrel 17 serving as a sixth group lens frame is provided in the base barrel 1 so as to be able to move forward and backward in the axial direction with respect to the fixed lens barrel 3. 14 lens L12. A sixth lens group consisting of Ll3°L14 is provided. That is, the movable lens barrel 17 is connected to the base barrel 1.
The movable lens fl is supported by a guide shaft 18 provided therein so as to be able to move forward and backward with respect to the inside of the fixed lens barrel 3.
A connecting portion 19 is provided protruding from the upper portion of l17.
また、上記基筒１の上部にリニアモータ２１が設けられ
ている。このリニアモータ２１は、ハウジング２２に固
定子２３が設けられている。この固定子２３は、ハウジ
ング２２の内側に取付けた円環状の磁石２４、この磁石
２４の一端面に取付けた円環状のポールピース２５、お
よび磁石２４の他端面側から上記ポールピース２５の外
側にわたってＬｌ ＜プた円筒状のヨーク２６からなっ
ている。。Further, a linear motor 21 is provided at the upper part of the base cylinder 1. This linear motor 21 has a stator 23 provided in a housing 22. The stator 23 includes an annular magnet 24 attached to the inside of the housing 22, an annular pole piece 25 attached to one end surface of the magnet 24, and a section extending from the other end surface of the magnet 24 to the outside of the pole piece 25. It consists of a cylindrical yoke 26 with Ll<. .
上記ハウジング２２内に両端部のリニアボール軸受２７
を介して円柱状の出力軸２８が軸方向スライド自在に支
持され、この出力軸２８の中央部に可動子２９が一体的
に設けられている。この可動子２９は、出力軸２８に一
体に固・定したボビン３０の外周辺部にコイル３１が巻
回され、このコイル３１が上記ポールピース２５とヨー
ク２６との間の細隙に軸方向進退移動自在に挿入されて
いる。また、上記可動子２９のボビン３０に、上記第６
群レンズ枠としての可動レンズ筒１７の連結部１９が数
個のねじ３２で連結されている。Linear ball bearings 27 at both ends are installed in the housing 22.
A cylindrical output shaft 28 is supported so as to be slidable in the axial direction, and a movable element 29 is integrally provided at the center of the output shaft 28. This mover 29 has a coil 31 wound around the outer periphery of a bobbin 30 that is integrally fixed to the output shaft 28, and this coil 31 is axially inserted into the gap between the pole piece 25 and the yoke 26. It is inserted so that it can move forward and backward. Further, the sixth bobbin 30 of the mover 29 is
A connecting portion 19 of a movable lens barrel 17 serving as a group lens frame is connected with several screws 32.
そして、リニアモータ２１は、可動子２９のコイル３１
に供給される電流量と゛方向により、可動子２９ととも
に出力軸２８が図中左方または右方に移動し、この出力
＠２８の進退により、連結部１９を介して可動レンズ筒
１７をガイド軸１８に沿って軸方向に進退し、第６群レ
ンズ（マスターレンズ）Ｌ１２．Ｌｌ３゜Ｌ １４を進
退するようになっている。The linear motor 21 has a coil 31 of the movable element 29.
Depending on the amount of current supplied and the direction, the output shaft 28 moves to the left or right in the figure together with the movable element 29, and the movement of the output @28 causes the movable lens barrel 17 to move along the guide shaft via the connecting portion 19. 18 in the axial direction, and the sixth group lens (master lens) L12. It moves forward and backward at Ll3°L14.
そして、上記第１〜第９レンズＬ１〜し９によりズーム
レンズ系を構成し、第１０〜第１４レンズＬ １ｏ〜Ｌ
特により結像レンズ系を構成している。The first to ninth lenses L1 to L1 constitute a zoom lens system, and the tenth to fourteenth lenses L1 to L1 constitute a zoom lens system.
In particular, it constitutes an imaging lens system.
また、上記基筒１の固定レンズ筒３と可動レンズ筒１７
の間にマスターレンズ位置、すなわち、可動レンズｎ１
７の位置を検出する静電容量位置センサ４１が設けられ
ている。このマスターレンズ位置を示すセンサ４１は、
固定レンズ筒３の内周の軸方向に円環状の一対の固定電
極４２．４３が円環状の絶縁体４４を介して互いに軸方
向に隣接して絶縁状態で取付けられているとともに、上
記可動レンズ筒１７の前部の外周に可動レンズ筒１７の
移動量以上の幅を有する円環状の可動電極４５が取付け
られ、上記固定電極４２．４３と可動電極４５とは少許
の間隙を介して対向して、２個の可変コンデンサを構成
している。In addition, the fixed lens barrel 3 and the movable lens barrel 17 of the base barrel 1 are
between the master lens position, i.e. the movable lens n1
A capacitance position sensor 41 for detecting the position of 7 is provided. The sensor 41 that indicates the master lens position is
A pair of annular fixed electrodes 42 and 43 are attached in an insulated state adjacent to each other in the axial direction via an annular insulator 44 on the inner periphery of the fixed lens barrel 3. An annular movable electrode 45 having a width greater than the amount of movement of the movable lens barrel 17 is attached to the outer periphery of the front part of the tube 17, and the fixed electrodes 42, 43 and the movable electrode 45 face each other with a small gap therebetween. This constitutes two variable capacitors.
そして、第２図に示すように、上記一対の固定電極４２
．４３は同一の金属材により同−形の円環状にそれぞれ
一体に形成されており、また、上記絶縁体４４は合成樹
脂により一対の固定電極４２．４３と同一径に幅狭の円
環状に一体に形成されている。Then, as shown in FIG. 2, the pair of fixed electrodes 42
．． The insulator 43 is integrally formed of the same metal material in the same ring shape, and the insulator 44 is formed of synthetic resin into a narrow ring shape with the same diameter and width as the pair of fixed electrodes 42 and 43. is formed.
また、上記固定レンズ筒３の後端部の内周面に、内端の
段差部４７を介して内径の大きな、すなわち、上記一対
の固定電極４２．４３および絶縁体４４の外径と対応す
る円環状の嵌合部４８が形成され、この嵌合部４８の外
端部に周縁部４９が形成されている。そして、上記固定
レンズ筒３の嵌合部４８に一方の固定電極４２、絶縁体
４４および他方の固定電極４３が順次軸方向に嵌合され
、かつ、第３図（Ａ）（２）に示すように、固定レンズ
筒３の周縁部４９を変形させることにより固定電極４３
の後端面が係止され、一対の固定電極４２．４３は段差
ｙ５４７と周縁部４９とで固定されているとともに、絶
縁体４４は一対の固定電極４２゜４３の間に挟持固定さ
れている。Further, a large inner diameter is provided on the inner circumferential surface of the rear end of the fixed lens barrel 3 via a stepped portion 47 at the inner end, that is, a diameter corresponding to the outer diameter of the pair of fixed electrodes 42 and 43 and the insulator 44 is provided. An annular fitting portion 48 is formed, and a peripheral edge portion 49 is formed at the outer end of the fitting portion 48 . Then, one of the fixed electrodes 42, the insulator 44, and the other fixed electrode 43 are sequentially fitted into the fitting portion 48 of the fixed lens barrel 3 in the axial direction, as shown in FIG. 3(A)(2). By deforming the peripheral edge 49 of the fixed lens barrel 3, the fixed electrode 43
The rear end surface is locked, the pair of fixed electrodes 42, 43 are fixed by the step y547 and the peripheral edge 49, and the insulator 44 is sandwiched and fixed between the pair of fixed electrodes 42, 43.
また、上記固定レンズ筒３の上記嵌合部４８に対応する
一側外壁部に突部５１が設けられ、この突部５１に上記
一対の固定電極４２．４３に対応する一対の貫通孔５２
．５３が穿設されている。また、上記突部５１に上記セ
ンサ４１の信号発生回路が形成された信号発生装置とし
てのプリント基板５４がねじ等で固着され、このプリン
ト基板５４に上記一対の貫通孔５２．５３と対応する位
置に一対のコイル状のスプリング５５．５６の外端部が
はんだ付けで取付けられ、この一対のスプリング５５．
５６が貫通孔５２．５３に挿入されて先端が一対の固定
電極４２．４３に弾力的に接触され、一対の固定電極４
２．４３と信号発生装置としてのプリント基板５４とは
一対のスプリング５５゜５６により接続されている。Further, a protrusion 51 is provided on one side outer wall portion of the fixed lens barrel 3 corresponding to the fitting portion 48, and a pair of through holes 52 corresponding to the pair of fixed electrodes 42 and 43 are provided in this protrusion 51.
．． 53 is drilled. Further, a printed circuit board 54 as a signal generating device in which a signal generating circuit of the sensor 41 is formed is fixed to the protrusion 51 with screws or the like, and the printed circuit board 54 is attached to the printed circuit board 54 at positions corresponding to the pair of through holes 52 and 53. The outer ends of a pair of coiled springs 55.56 are attached by soldering to the pair of springs 55.56.
56 is inserted into the through hole 52.53, and its tip is elastically contacted with the pair of fixed electrodes 42.43.
2.43 and a printed circuit board 54 as a signal generator are connected by a pair of springs 55 and 56.
また、第４図に示すように、上記可動電極４５は、金属
材により上記一対の固定電極４２．４３内に侵入可能な
径の円環状に一体に形成されている。Further, as shown in FIG. 4, the movable electrode 45 is integrally formed of a metal material into an annular shape with a diameter that can penetrate into the pair of fixed electrodes 42 and 43.
また、上記可動レンズ筒１７の１端部の外周面に、内端
の段差部５８を介して外径の小さな、すなわち、上記可
動電極４５の内径と対応する円環状の嵌合部５９が形成
され、この嵌合部５９の外端部に周縁部６゜が形成され
ている。そして、上記可動レンズ筒１７の嵌合部５９に
可動電極４５が軸方向に嵌合され、可動レンズ筒１７の
周縁部６０を変形させることにより可動電極４５の前端
面が係止され、可動電極４５は段差部５８と周縁部６０
とで固定されている。さらに、上記可動レンズ筒１７の
外周面には上部において軸方向に延びる満６１および前
端上部にこの溝６１と連なる切欠部６２が形成されてい
る。そして、上記溝６１および切欠部６２にほぼ１字状
の信号出力用の導電片６３が配設されている。この導電
片６３は、上記切欠部６２に嵌着された接触部６４と、
この接触ａ！６４の中央部から後方に延びてＷＩＳ６１
内に挿入された接続部６５を有しており、接触部６４が
上記可動電極４５の内面に弾力的に接触して接続され、
接続部６５の後端部は、第１図および第２図に示すよう
に、リニアモータ２１の可動子２９と可動レンズ筒１７
を結合する連結ＰＩ１１９の背面で折り曲げられ、この
連結部１９に固定されたフレキシブル形のプリント基板
６６に接続されている。このプリント基板６６にはイン
ピーダンス変換増幅器としてのＦＥＴ増幅器６７および
リニアモータ２１のコイル３１の端子が取付けられてお
り、かつ、プリント基板６６の帯状の一部６７ａが外部
に接続されている。Further, an annular fitting part 59 having a small outer diameter, that is, corresponding to the inner diameter of the movable electrode 45, is formed on the outer peripheral surface of one end of the movable lens barrel 17 via a step part 58 at the inner end. A peripheral edge portion 6° is formed at the outer end of this fitting portion 59. Then, the movable electrode 45 is fitted in the fitting portion 59 of the movable lens barrel 17 in the axial direction, and by deforming the peripheral edge 60 of the movable lens barrel 17, the front end surface of the movable electrode 45 is locked, and the movable electrode 45 is a stepped portion 58 and a peripheral portion 60
It is fixed with. Further, on the outer circumferential surface of the movable lens barrel 17, a groove 61 extending in the axial direction is formed at the upper part, and a notch 62 continuous with the groove 61 is formed at the upper front end. In the groove 61 and the notch 62, a substantially single-shaped conductive piece 63 for signal output is provided. This conductive piece 63 has a contact portion 64 fitted into the notch 62, and
This contact a! WIS61 extends rearward from the center of 64
The movable electrode 45 has a connecting portion 65 inserted therein, and a contact portion 64 is connected by elastically contacting the inner surface of the movable electrode 45.
As shown in FIGS. 1 and 2, the rear end of the connecting portion 65 is connected to the movable element 29 of the linear motor 21 and the movable lens barrel 17.
It is bent at the back side of the connecting PI 119 that connects the connecting portion 19, and is connected to a flexible printed circuit board 66 fixed to this connecting portion 19. A FET amplifier 67 as an impedance conversion amplifier and a terminal of the coil 31 of the linear motor 21 are attached to the printed circuit board 66, and a strip-shaped portion 67a of the printed circuit board 66 is connected to the outside.
そうして、被写体の影像は、第１群〜第６群の各レンズ
Ｌ零〜Ｌ １４を経てカメラ本体のフィルム面または撮
像素子面上に結像される。Then, the image of the subject is formed on the film surface or image sensor surface of the camera body through the lenses L0 to L14 of the first to sixth groups.
ｍ影にあたっては、リニアモータ２１を作動して可動レ
ンズ筒１７を進退し、結像レンズ系の可動レンズである
第１２、第１３、第１４レンズＬ１２゜Ｌｌａ、Ｌｕを
進退して焦点合わせを行なうが、この際、図示しない位
置設定部でマニュアルまたはオートフォーカス機能によ
り撮影距離を設定し、その信号を位置指示部に出力する
。When approaching the m shadow, the linear motor 21 is operated to move the movable lens barrel 17 forward and backward, and the 12th, 13th, and 14th lenses L12°Lla, Lu, which are movable lenses of the imaging lens system, are moved back and forth to adjust the focus. At this time, the photographing distance is set manually or by an autofocus function in a position setting section (not shown), and the signal thereof is output to the position instruction section.
これとともに、結像レンズ位置を示すセンサ、４１が作
動する。すなわち、信号発生装置であるプリント基板５
４から一対の固定電極４２．４３に基準電圧が印加され
ており、これと対向する可動電極４５には対向面積が変
化することにより、その位置に対応した信号が生じ、こ
の信号が導電片６３で可動レンズ筒４５の１ｍ部１９に
設けたプリント基板６６に供給され、ＦＥＴ増幅器６７
で増幅される。結像レンズが変位の中心位−にある場合
は、可動レンズｆｉ１７の可動電極４５に対する一対の
固定電極４２．４３の対向面積が等しく、一対の可変コ
ンデンサの静電容量がそれぞれ等しい。そして、可動レ
ンズ筒１７とともに可動電極４５を進退することにより
一対の固定電極４２．４３の対向面積がそれぞれ変化し
、たとえば、撮影距離が短くて、第６群レンズを前の位
置より前方位置にすると、一方の可変コンデンサの静電
容量が増加するとともに、他方の可変コンデンサの１ｌ
ｉｉ１電容昂が減少し、反対に、［距離が遠く、第６群
レンズを前の位置より後方位置にすると、一方の可変コ
ンデンサの静電容量が減少するとともに、他方の可変コ
ンデンサの静電容量が増加し、このように、第６群レン
ズの変位に連動して一対の可変コンデンサの静電容量が
変化し、これを第６群レンズの位ぎとして出力する。At the same time, a sensor 41 indicating the position of the imaging lens is activated. That is, the printed circuit board 5 which is a signal generator
A reference voltage is applied to a pair of fixed electrodes 42 and 43 from 4 to 4, and a signal corresponding to the position is generated in the movable electrode 45 facing the movable electrode 45 by changing its opposing area. is supplied to the printed circuit board 66 provided in the 1 m section 19 of the movable lens barrel 45, and is supplied to the FET amplifier 67.
is amplified. When the imaging lens is at the center of displacement -, the opposing areas of the pair of fixed electrodes 42 and 43 with respect to the movable electrode 45 of the movable lens fi17 are equal, and the capacitances of the pair of variable capacitors are equal. By moving the movable electrode 45 forward and backward together with the movable lens barrel 17, the opposing areas of the pair of fixed electrodes 42 and 43 change respectively. Then, the capacitance of one variable capacitor increases and the capacitance of the other variable capacitor increases.
ii1 The capacitance decreases, and conversely, [if the distance is long and the 6th group lens is positioned more rearward than the previous position, the capacitance of one variable capacitor decreases, and the capacitance of the other variable capacitor decreases. increases, and in this way, the capacitance of the pair of variable capacitors changes in conjunction with the displacement of the sixth group lens, and this is output as the displacement of the sixth group lens.
このマスターレンズの位置を示すセンサ４１からの出力
によりＷ５６群レンズの位置を判別し、この信号を位置
指示部に出力し、ここで前記の位置設定部からの撮影距
離に対応するＭ＠レンズ位置とを比較し、すなわち、焦
点調節装置から出力される第６群レンズの移動先位置情
報と、センサ４１から得られる第６群レンズの現在位置
情報より、サーボ回路が作動して可動子２９のコイル３
１に流れる電流量と方向が決定され、リニアモータ２１
を駆動し、第６群レンズを指示位置に設定し、焦点合わ
せが行なわれる。The position of the W56 group lens is determined based on the output from the sensor 41 indicating the position of the master lens, and this signal is output to the position indicating section, where the M@lens position corresponding to the photographing distance from the position setting section is determined. In other words, based on the movement destination position information of the sixth group lens outputted from the focus adjustment device and the current position information of the sixth group lens obtained from the sensor 41, the servo circuit operates to move the movable element 29. coil 3
The amount and direction of the current flowing through the linear motor 21 are determined.
is driven, the sixth group lens is set at the designated position, and focusing is performed.
上記作動に際して、可動レンズ筒１７が変位して、一対
の固定＠極４２．４３からの基準信号の不平衡分が検出
されるが、このとき、導電片６３は可動電極４５より中
心の光軸寄りに配置されているので、固定電極４２．４
３の影響を受けることはない。すなわち、固定電極４２
．４３と可動電極４５との対向間隔よりも、可動電極４
５の溝６１に設けた導電片６３の接続部６５と固定電極
４２．４３との対向間隔の方が大きい。そして、一般に
、静電容量は電極間距離の二乗に反比例するため、可動
電極４５に生ずる信号に比し、導電片６３に生ずる誤信
号はきわめて小さくなる。したがって、可動電極４５の
出力線が固定電極４２．４３の一方の影響を受けて誤信
号が出力されることはない。During the above operation, the movable lens barrel 17 is displaced and the unbalanced portion of the reference signal from the pair of fixed @poles 42 and 43 is detected. Since the fixed electrode 42.4 is placed close to the
It is not affected by 3. That is, the fixed electrode 42
．． 43 and the movable electrode 45, the movable electrode 4
The facing distance between the connecting portion 65 of the conductive piece 63 provided in the groove 61 of No. 5 and the fixed electrodes 42 and 43 is larger. Since capacitance is generally inversely proportional to the square of the distance between the electrodes, the error signal generated at the conductive piece 63 is extremely small compared to the signal generated at the movable electrode 45. Therefore, the output line of the movable electrode 45 will not be affected by one of the fixed electrodes 42, 43 and an erroneous signal will not be output.
また、可動電極４５で得られた検出信号を連結部１９に
設けた増幅器６７で増幅して、レンズ鏡筒の外部に取出
すので、検出信号１ユレンズ鏡筒内部で増幅器６７によ
りインピーダンス変換され、それ以後の電気回路はレン
ズ鏡筒の外部に出ても外乱ノイズに影響されない。In addition, since the detection signal obtained by the movable electrode 45 is amplified by the amplifier 67 provided in the connecting part 19 and taken out to the outside of the lens barrel, the detection signal 1 is impedance-converted by the amplifier 67 inside the lens barrel, and The subsequent electrical circuits are not affected by external noise even if they go outside the lens barrel.
なお、実施にあたって、第５図および第６図に示すよう
に、可動電極４５と導電片６３の接続部６５は一体に形
成してもよい。また、固定レンズ筒と可動レンズ筒は、
径の大小を反対にして、固定レンズ筒の外周で可動レン
ズ筒が進退するようにしてもよ（、この場合、固定レン
ズ筒の外面に一対の固定電極を取付けるとともに、可動
レンズ筒の内面に可動電極を取付ければよい。In addition, in implementation, as shown in FIGS. 5 and 6, the movable electrode 45 and the connecting portion 65 of the conductive piece 63 may be formed integrally. In addition, the fixed lens barrel and movable lens barrel are
It is also possible to reverse the size of the diameter so that the movable lens barrel moves forward and backward around the outer periphery of the fixed lens barrel (in this case, a pair of fixed electrodes are attached to the outer surface of the fixed lens barrel, and a pair of fixed electrodes are attached to the inner surface of the movable lens barrel). All you need to do is attach a movable electrode.
本発明によれば、固定電極と可動電極との対向間隔より
も、可ａｌｌ電極の溝に設けた導電片と固定電極との対
向間隔の方が大きく、可動電極に生ずる信号に比し、導
電片に生ずる誤信号はきわめて小さくなり、したがって
、可動電極の出力線が固定電極の一方の影響を受けて誤
信号が出力されることはない。According to the present invention, the facing distance between the conductive piece provided in the groove of the movable electrode and the fixed electrode is larger than the facing distance between the fixed electrode and the movable electrode, and the conductive piece is larger than the facing distance between the fixed electrode and the movable electrode. The erroneous signal generated on one side is extremely small, so that the output line of the movable electrode is not affected by one of the fixed electrodes and no erroneous signal is output.
また、可動電極で得られた検出信号を３１結部に設けた
増幅器で増幅して、レンズ鏡筒の外部に取出すことによ
り、検出信号はレンズ鎮筒内部でインピーダンス変換さ
れ、それ以後の電気回路はレンズｙＬ筒の外部に出ても
外乱ノイズに影響されず、１確な信号を得ることができ
る。In addition, by amplifying the detection signal obtained by the movable electrode with an amplifier installed at the 31 junction and taking it out to the outside of the lens barrel, the detection signal is impedance-converted inside the lens barrel, and the subsequent electric circuit Even if it goes outside the lens yL tube, it is not affected by disturbance noise and can obtain a reliable signal.
第１図は本発明のレンズ鏡筒の一実施例を示す断面図、
第２図は第１図の一部の分解斜視図、第３図（Ａ） （
Ｂ）は第１図の一部の断面図、第４図は可動レンズ筒部
の分解斜視図、第５図および第６図は導電片の他の実施
例を示す斜視図である。
３・・固定レンズ筒、１７・・可動レンズ筒、１９・・
連結部、４１・・センサ、４２．４３・・一対の固定電
極、４５・・可動電極、６１・・溝、６３・・導電片、
６７・・増幅器。
、も４１−
尊づと臥FIG. 1 is a sectional view showing an embodiment of the lens barrel of the present invention;
Figure 2 is an exploded perspective view of a part of Figure 1, and Figure 3 (A) (
B) is a sectional view of a part of FIG. 1, FIG. 4 is an exploded perspective view of the movable lens barrel, and FIGS. 5 and 6 are perspective views showing other embodiments of the conductive piece. 3. Fixed lens barrel, 17. Movable lens barrel, 19.
Connecting portion, 41...sensor, 42.43...pair of fixed electrodes, 45...movable electrode, 61...groove, 63...conductive piece,
67...Amplifier. ,Mo41- Respect and sleep
Claims (2)
可動レンズ筒と、 上記固定レンズ筒に一対の固定電極を軸方向に隣接して
設けるとともに、上記可動レンズ筒に上記一対の固定電
極に間隙をおいて対向する可動電極を設けた可動レンズ
位置検出用のセンサとを備えたレンズ鏡筒において、 上記可動レンズ筒の軸方向に溝を形成し、 この溝に上記可動電極に接続された信号出力用の導電片
を設けた ことを特徴とするレンズ鏡筒。(1) a fixed lens barrel; a movable lens barrel provided to be able to freely move back and forth in the axial direction with respect to the fixed lens barrel; a pair of fixed electrodes provided adjacent to the fixed lens barrel in the axial direction; A lens barrel is provided with a sensor for detecting the position of a movable lens in which a movable electrode is provided in the barrel and faces the pair of fixed electrodes with a gap therebetween, wherein a groove is formed in the axial direction of the movable lens barrel; A lens barrel characterized in that a conductive piece for signal output connected to the movable electrode is provided.
を設け、この連結部に可動電極からの導電片を接続した
増幅器を設けたことを特徴とする請求項１記載のレンズ
鏡筒。(2) The lens barrel according to claim 1, characterized in that the movable lens barrel is provided with a connecting portion coupled to a driving motor, and an amplifier connected to the conductive piece from the movable electrode is provided in the connecting portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63020655A JP2733585B2 (en) | 1988-01-30 | 1988-01-30 | Lens barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63020655A JP2733585B2 (en) | 1988-01-30 | 1988-01-30 | Lens barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01196012A true JPH01196012A (en) | 1989-08-07 |
| JP2733585B2 JP2733585B2 (en) | 1998-03-30 |
Family
ID=12033231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63020655A Expired - Lifetime JP2733585B2 (en) | 1988-01-30 | 1988-01-30 | Lens barrel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2733585B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61112U (en) * | 1984-06-05 | 1986-01-06 | キヤノン株式会社 | Lens barrel motor vibration isolation structure |
| JPS61124010U (en) * | 1985-01-21 | 1986-08-05 | ||
| JPS62262009A (en) * | 1986-05-08 | 1987-11-14 | Chinon Kk | Lens barrel |
-
1988
- 1988-01-30 JP JP63020655A patent/JP2733585B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61112U (en) * | 1984-06-05 | 1986-01-06 | キヤノン株式会社 | Lens barrel motor vibration isolation structure |
| JPS61124010U (en) * | 1985-01-21 | 1986-08-05 | ||
| JPS62262009A (en) * | 1986-05-08 | 1987-11-14 | Chinon Kk | Lens barrel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2733585B2 (en) | 1998-03-30 |
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