JPH0377970B2 - - Google Patents
Info
- Publication number
- JPH0377970B2 JPH0377970B2 JP28003384A JP28003384A JPH0377970B2 JP H0377970 B2 JPH0377970 B2 JP H0377970B2 JP 28003384 A JP28003384 A JP 28003384A JP 28003384 A JP28003384 A JP 28003384A JP H0377970 B2 JPH0377970 B2 JP H0377970B2
- Authority
- JP
- Japan
- Prior art keywords
- aperture
- aperture value
- lens
- transmission member
- value
- 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.)
- Expired
Links
- 230000005540 biological transmission Effects 0.000 claims description 85
- 230000011514 reflex Effects 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 description 13
- 238000004364 calculation method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005375 photometry Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Exposure Control For Cameras (AREA)
- Diaphragms For Cameras (AREA)
Description
【発明の詳細な説明】
技術分野
本発明は内部測光式一眼レフレツクスカメラ用
交換レンズ、特にシヤツタ速度が自動制御される
機構（シヤツタ速度EE）と、絞りが自動制御さ
れる機構（絞りEE）とを備えたカメラに使用す
る交換レンズに関するものである。Detailed Description of the Invention Technical Field The present invention relates to an interchangeable lens for a single-lens reflex camera with internal photometry, and in particular to a mechanism for automatically controlling the shutter speed (shutter speed EE) and a mechanism for automatically controlling the aperture (aperture EE). ) This relates to an interchangeable lens for use in a camera equipped with.
従来技術
従来絞りEE機構を備えた内部測光式一眼レフ
レツクスカメラに使用する交換レンズには、その
交換レンズの最大開放絞り値の情報を直接カメラ
ボデイに伝達する伝達部材を設けるのが一般的で
あつた。これは、カメラボデイ側で自動制御され
る絞り値を実際の絞り込み動作開始前に算出表示
するためには、交換レンズの最大開放絞り値の情
報が必要であるからである。Conventional technology Interchangeable lenses used in internal metering single-lens reflex cameras equipped with conventional aperture EE mechanisms are generally equipped with a transmission member that directly transmits information about the maximum aperture value of the interchangeable lens to the camera body. It was hot. This is because information on the maximum aperture value of the interchangeable lens is required in order to calculate and display the aperture value that is automatically controlled on the camera body side before starting the actual narrowing down operation.
一方、シヤツタ速度EE機構を備えた内部測光
式一眼レフレツクスカメラの場合、その交換レン
ズの最大開放絞り値から設定絞り値までの段数差
の情報が交換レンズから入力されれば、シヤツタ
速度の自動制御と絞り込み動作開始前の時点での
自動制御されるシヤツタ速度の算出表示とが可能
であり、したがつて、そのような絞り段数差の情
報を伝達する伝達部材のみを備えた交換レンズが
使用されている。 On the other hand, in the case of an internal metering single-lens reflex camera equipped with a shutter speed EE mechanism, if information about the difference in steps from the maximum aperture value of the interchangeable lens to the set aperture value is input from the interchangeable lens, the shutter speed can be adjusted. Automatic control and calculation and display of automatically controlled shutter speed before the start of aperture operation are possible, and therefore, an interchangeable lens equipped only with a transmission member that transmits information on the difference in the number of aperture steps is possible. It is used.
ところが、このようなシヤツタ速度EE機構を
備えた内部測光式一眼レフレツクスカメラにさら
に絞りEE機構を設け、シヤツタ速度EEと絞り
EEとが共に可能なカメラを新たに作る場合、上
記のような絞り段数差の情報を伝達する伝達部材
のみ備えた交換レンズを使用しても、絞り込み動
作開始前に自動制御される絞り値を算出表示する
ことができず、カメラ使用者にとつてはきわめて
不便なものとなる。これは、先に絞りEE機構を
備えた内部測光式一眼レフレツクスカメラの場合
について述べたように、その算出表示のためには
交換レンズの最大開放絞り値の情報が必要とされ
るからであり、したがつて、普通に考えれば、シ
ヤツタ速度EEと絞りEEとが共に可能な内部測光
式一眼レフレツクスカメラに使用する交換レンズ
には、上記絞り段数の情報を伝達する伝達部材と
最大開放絞り値の情報を伝達する絞り伝達部材と
を共に設ければよいということになる。 However, an internal metering single-lens reflex camera equipped with such a shutter speed EE mechanism is also equipped with an aperture EE mechanism, which allows shutter speed EE and aperture to be adjusted.
When creating a new camera that is compatible with EE, even if you use an interchangeable lens that only has a transmission member that transmits information about the difference in the number of aperture steps as described above, the aperture value that is automatically controlled before the aperture operation starts. It cannot be calculated and displayed, which is extremely inconvenient for camera users. This is because, as mentioned earlier in the case of an internal metering single-lens reflex camera equipped with an aperture EE mechanism, information on the maximum aperture value of the interchangeable lens is required to display the calculation. Therefore, if you think about it normally, an interchangeable lens used for an internal metering single-lens reflex camera that is capable of both shutter speed EE and aperture EE should have a transmission member that transmits information about the number of aperture steps mentioned above, and a maximum This means that it is sufficient to provide an aperture transmission member that transmits information about the open aperture value.
しかしながら、これまで市販されている交換レ
ンズについて調べれば分るように、レンズ性能に
応じて最大開放絞り値は1EV刻みにとどまらず
種々の値に小刻みに設定され（例えば、F1.2，
F1.4，F1.7，F2，F2.5，F2.8，F3.5，F4，F4.5，
F5.6等）、その値は多くの種類をもつ。したがつ
て、最大開放絞り値の情報を伝達部材によつてカ
メラボデイ側に伝達する場合、予定する最大開放
絞り値の数に合わせて伝達部材の位置や突出量に
多くの差をもたせなければならず、しかもその場
合各位置や突出量はカメラボデイ側の被伝達部材
で確実に識別して検出されなければならないか
ら、交換レンズにおいて、その伝達部材を設ける
べき位置として広いスペースを確保するか、ある
いはその伝達部材の突出量に大きな幅を与えなけ
ればならない。ところが、上記のように絞り段数
差を伝達する部材がすでに設けられている交換レ
ンズでは、位置差により最大開放絞り値を伝達す
る伝達部材をさらに設けるとなると、それを設置
する広いスペースをカメラボデイとの関係におい
て確保することは実際上困難であることが多く、
敢えてこれを行えば、その伝達部材の最大開放絞
り値に応じた位置差（例えば、F1.4とF1.2あるい
はF1.4とF1.7）を十分設けることができず、被伝
達部材による正確なその位置差の検出がむずかし
くなるばかりか、製作誤差によりわずかにその伝
達部材の形成位置がずれても、最大開放絞り値の
カメラボデイへの正確な伝達ができなくなる。一
方、伝達部材の突出量に最大開放絞り値に応じて
差を設ける場合も事情はほぼ同様である。（この
場合、カメラボデイに対する交換レンズの接合面
にその伝達部材を設けることが考えられるが、こ
のようにすると、絞りEE機構を備えない内部測
光式一眼レフレツクスカメラに対しては、その伝
達部材が邪魔になり、交換レンズのカメラボデイ
への装着ができなくなることも考えられる。）
目 的
本発明は、上述の事情に鑑みて、シヤツタ速度
EEが可能な内部測光式一眼レフレツクスカメラ
用として知られている上記絞り段数差の第１伝達
部材を備えた交換レンズに、直接最大開放絞り値
を伝達する伝達部材を付設する代わりに、より正
確な情報伝達を可能とする第２伝達部材を付設す
ることによつて、簡単な操作で、この第２伝達部
材が伝達する情報とすでに設けられている第１伝
達部材が伝達する上記絞り段数差の情報とからカ
メラボデイ側において該交換レンズの最大開放絞
り値の情報を得ることができるようにし、その結
果、シヤツタ速度EE機構と絞りEE機構を併せも
つ内部測光式一眼レフレツクスカメラへの使用も
可能となる共に、カメラボデイへの装着時に第１
伝達部材が付設した第２伝達部材に対応するカメ
ラボデイ側の第２被伝達部材に係合して装着動作
の妨げとなることがないようにした交換レンズを
提供することを目的としている。 However, as you can see by examining the interchangeable lenses currently on the market, the maximum aperture value is set not only in 1EV increments but also in small increments depending on the lens performance (for example, F1.2,
F1.4, F1.7, F2, F2.5, F2.8, F3.5, F4, F4.5,
f/5.6, etc.), and there are many types of values. Therefore, when transmitting information about the maximum aperture value to the camera body using a transmission member, the position and protrusion of the transmission member must vary widely depending on the number of planned maximum aperture values. In that case, each position and amount of protrusion must be reliably identified and detected by the transmission member on the camera body side, so it is necessary to secure a large space for the position where the transmission member is installed in the interchangeable lens. , or a large range must be given to the amount of protrusion of the transmission member. However, in an interchangeable lens that already has a member that transmits the difference in the number of aperture steps as described above, if a transmission member that transmits the maximum aperture value based on the positional difference is additionally provided, a large space for installing it would be required in the camera body. It is often difficult in practice to ensure that
If you do this, you will not be able to provide enough positional difference (for example, F1.4 and F1.2 or F1.4 and F1.7) depending on the maximum aperture value of the transmission member, and the Not only is it difficult to accurately detect the positional difference, but even if the formation position of the transmission member is slightly shifted due to manufacturing errors, it becomes impossible to accurately transmit the maximum aperture value to the camera body. On the other hand, the situation is almost the same when the amount of protrusion of the transmission member is varied depending on the maximum aperture value. (In this case, it is conceivable to provide the transmission member on the joint surface of the interchangeable lens to the camera body, but if this is done, the transmission member will be It is conceivable that the parts may get in the way and make it impossible to attach the interchangeable lens to the camera body.) Purpose: In view of the above circumstances, the present invention has been made to improve the shutter speed.
Instead of attaching a transmission member that directly transmits the maximum aperture value to an interchangeable lens equipped with the first transmission member for the difference in the number of aperture steps, which is known for use in internal metering single-lens reflex cameras capable of EE, By attaching a second transmission member that enables more accurate information transmission, the information transmitted by this second transmission member and the above-mentioned aperture transmitted by the already installed first transmission member can be easily adjusted. Information on the maximum aperture value of the interchangeable lens can be obtained on the camera body side from the information on the difference in the number of steps, and as a result, an internal metering single-lens reflex camera that has both a shutter speed EE mechanism and an aperture EE mechanism is created. It can also be used for
It is an object of the present invention to provide an interchangeable lens in which a transmission member does not engage with a second transmission member on a camera body side corresponding to a second transmission member attached thereto, thereby preventing the mounting operation from being obstructed.
要 旨
本発明の交換レンズは、該レンズの最大開放絞
り値から設定絞り値までの絞り段数を伝達する第
１伝達部材と、該レンズの最小絞り値を伝達する
第２伝達部材とを備えている。第１伝達部材は、
それ自体知られているように絞り設定部材と一体
にその周方向に該レンズの最大開放絞り値の値に
関係なく最大開放絞り値目盛から一定距離隔てて
設けられており、絞り設定部材が最大開放絞り設
定位置から所望の絞り値設定位置に回動される
と、最大開放絞り値からその設定絞り値までの絞
り段数に応じた距離を移動してカメラボデイ側の
第１被伝達部材にその絞り段数の情報を伝達す
る。一方、第２伝達部材も同じく絞り設定部材と
一体に設けられているが、これは絞り設定部材の
周方向に該レンズの最小絞り値の値に依存した距
離だけ最小絞り値目盛から隔てて設けられてお
り、絞り設定部材が最小絞り値設定位置に回動さ
れたとき該レンズの最小絞り値に応じた位置を占
めてカメラボデイ側の第２被伝達部材にその最小
絞り値の情報を伝達する。すなわち、本発明の交
換レンズでは、最大開放絞り値をカメラボデイ側
に伝達する代わりに最小絞り値の情報を第２伝達
部材によりカメラボデイ側に伝達するが、市販の
交換レンズに見られるように、最小絞り値の種類
は最大開放絞り値の種類よりも少ないため（一般
にはF16，F22，F32である）、最大開放絞り値の
伝達部材のように小刻みに位置差を設ける必要が
なく、その分正確な情報が限られたスペースを利
用して可能となる。又、本発明の交換レンズで
は、第１，第２の伝達部材が絞り設定部材から光
軸方向後方に突出しており、第１伝達部材の突出
量が第２伝達部材の突出量よりも短いため、カメ
ラボデイへの装着時第１伝達部材はカメラボデイ
側第２被伝達部材と係合しない。Summary The interchangeable lens of the present invention includes a first transmission member that transmits the number of aperture steps from the maximum open aperture value of the lens to a set aperture value, and a second transmission member that transmits the minimum aperture value of the lens. There is. The first transmission member is
As is known per se, it is provided integrally with the aperture setting member and spaced a certain distance from the maximum aperture scale in the circumferential direction regardless of the maximum aperture value of the lens, so that the aperture setting member When the aperture is rotated from the maximum aperture setting position to the desired aperture value setting position, the aperture is moved a distance corresponding to the number of aperture steps from the maximum aperture value to the set aperture value, and is transferred to the first transmission member on the camera body side. Transmits information on the number of aperture stages. On the other hand, the second transmission member is also provided integrally with the aperture setting member, but is spaced apart from the minimum aperture scale in the circumferential direction of the aperture setting member by a distance that depends on the minimum aperture value of the lens. When the aperture setting member is rotated to the minimum aperture value setting position, it occupies a position corresponding to the minimum aperture value of the lens and transmits information on the minimum aperture value to a second transmitted member on the camera body side. do. That is, in the interchangeable lens of the present invention, instead of transmitting the maximum aperture value to the camera body side, information on the minimum aperture value is transmitted to the camera body side by the second transmission member, but unlike in commercially available interchangeable lenses, Since there are fewer types of minimum aperture values than maximum aperture values (generally F16, F22, and F32), there is no need to provide small positional differences like in the case of the maximum aperture transmission member. Minute accurate information is possible using limited space. Further, in the interchangeable lens of the present invention, the first and second transmission members protrude rearward in the optical axis direction from the aperture setting member, and the amount of protrusion of the first transmission member is shorter than the amount of protrusion of the second transmission member. , when attached to the camera body, the first transmission member does not engage with the second transmission member on the camera body side.
実施例
まず、本発明実施例の説明に先立つて本発明に
よる情報伝達の基本原理を写真学的演算式によつ
て説明する。Embodiments First, prior to describing embodiments of the present invention, the basic principle of information transmission according to the present invention will be explained using photographic calculation formulas.
写真学的演算式（所謂アペツクス演算）での指
数符号を被写体輝度BV、フイルム感度SV、絞
り値AVそしてシヤツター速度をTVとすると、
適正露出の条件は良く知られているように、SV
＋BV＝AV＋TVである。 Let the exponent sign in the photographic calculation formula (so-called apex calculation) be the subject brightness BV, the film sensitivity SV, the aperture value AV, and the shutter speed be TV.
As is well known, the conditions for proper exposure are SV
+BV=AV+TV.
内部測光式自動露出制御カメラでは、測光はレ
ンズの開放絞り（AV0）をそのまま利用する開
放測光方式を採つておりその測光出力、BV−
AV0（＝BV0とする）を自動露出演算の基礎とし
ており、一般的な絞り優先式シヤツター速度オー
トの自動露出制御では上式を変形して次の２ツの
方式のいずれかを採用している。 Cameras with internal metering and automatic exposure control use a wide-open metering method that uses the lens's wide-open aperture (AV 0 ) as is, and its metering output, BV-
AV 0 (= BV 0 ) is the basis for automatic exposure calculation, and in general automatic exposure control with aperture priority shutter speed auto, the above formula is modified and one of the following two methods is adopted. ing.
TV＝SV＋（BV−AV0）
−AV＋AV0＝（SV＋BV0）−AV＋AV0 …(1)
TV＝SV＋（BV−AV0）
−（AV−AV0）＝（SV＋BV0）−Ｐ …(2)
(1)の方式にあつては装着された交換レンズ側か
ら該レンズの開放絞り値（AV0）と設定絞り値
（AV）の２ツの情報がカメラボデイに伝達され、
(2)の方式にあつては装着された交換レンズ側から
該レンズの開放絞り（AV0）から設定絞り
（AV）までの段数（Ｐ）、すなわち、交換レンズ
の絞り設定部材の回転量がカメラボデイに伝達さ
れるので、情報は１つである。この２つの方式の
交換レンズが本発明の対象となつている交換レン
ズである。 TV=SV+(BV-AV 0 ) -AV+AV 0 =(SV+BV 0 )-AV+AV 0 ...(1) TV=SV+(BV-AV 0 )-(AV-AV 0 )=(SV+BV 0 )-P...(2) ) In the case of method (1), two pieces of information, the open aperture value (AV 0 ) and the set aperture value (AV) of the lens, are transmitted from the attached interchangeable lens to the camera body,
In the case of method (2), the number of steps (P) from the attached interchangeable lens side to the lens' open aperture (AV 0 ) to the set aperture (AV), that is, the amount of rotation of the aperture setting member of the interchangeable lens. Since it is transmitted to the camera body, there is only one piece of information. These two types of interchangeable lenses are the interchangeable lenses that are the object of the present invention.
上記両方式を比較すると、(2)の方式では情報が
１つしか伝達されないのでコスト側に有利である
が、この有利性は絞り優先シヤツター速度自動制
御においてのみ存在する。即ち、(2)方式では交換
レンズ側からの情報として、設定段数（Ｐ）の情
報しかないので、シヤツター速度優先絞り自動制
御において適正絞り値の算出が出来ないという不
利さが生じる。他方、(1)方式でシヤツター速度優
先絞り自動制御モードを考えると、(1)式を変形し
てAV＝（SV＋BV0−TV）＋AV0という演算式に
従つて適正絞りの算出が可能である。このことは
冒頭に説明したように装着レンズの最大開放絞り
（AV0）の情報が交換レンズから伝達されるため
である。これに対し、本発明では、Ｐ＝AV−
AV0、これを変形してAV0＝AV−Ｐである点に
着目し、カメラボデイに装着した交換レンズの開
放絞り値AV0の情報をカメラボデイに直接伝達
する部材を設けず、カメラボデイに装着した交換
レンズの絞り設定部材を、絞り自動制御の時ある
特定位置にセツトすると共に、その特定セツト位
置は絞り値でどのような値であるのかという実数
値AVcとその時の絞り設定部材の回転量（絞り
の設定段数）Pcはいくらかという実数値を各々
AV，Ｐに代入してAV0を間接的にカメラボデイ
に伝達し、AV＝（SV＋BV0−TV）＋AVc−Pcと
いう演算式によつて適正絞りを算出可能にしよう
とするもので、上記特定位置として、開放絞り値
から最小絞り値までの全域での絞り自動制御を許
容する最小絞り値設定位置を選択したものであ
る。 Comparing both of the above methods, method (2) is advantageous in terms of cost because only one piece of information is transmitted, but this advantage exists only in automatic aperture priority shutter speed control. That is, in the method (2), since the information from the interchangeable lens side is only the set number of steps (P), there is a disadvantage that an appropriate aperture value cannot be calculated in automatic shutter speed priority aperture control. On the other hand, if we consider the shutter speed priority automatic aperture control mode using method (1), it is possible to calculate the appropriate aperture according to the formula AV = (SV + BV 0 - TV) + AV 0 by modifying formula (1). . This is because, as explained at the beginning, information about the maximum aperture (AV 0 ) of the attached lens is transmitted from the interchangeable lens. On the other hand, in the present invention, P=AV−
AV 0 , and focusing on the point that AV 0 = AV - P by modifying this, we did not provide a member that directly transmits the information of the open aperture value AV 0 of the interchangeable lens attached to the camera body to the camera body. The aperture setting member of the interchangeable lens attached to the camera is set to a specific position during automatic aperture control, and the actual value AVc of the aperture value at that specific set position and the aperture setting member at that time are determined. The actual value of the amount of rotation (set number of aperture stages) Pc is
The purpose is to indirectly transmit AV 0 to the camera body by substituting it into AV and P, and to make it possible to calculate the appropriate aperture using the formula AV = (SV + BV 0 - TV) + AVc - Pc. As the position, the minimum aperture value setting position is selected that allows automatic aperture control over the entire range from the open aperture value to the minimum aperture value.
以下、一実施例として示した図面に従つて、そ
の構成を説明する。 The configuration will be described below with reference to the drawings shown as one embodiment.
第１図は本発明交換レンズの１つを単体で示し
たもので、１は交換レンズ本体、３は回動操作可
能な絞り設定部材で、その外周側には、最大開放
絞り値目盛イから最小絞り値目盛ロまでの絞り値
目盛が順次印されていて、それらの目盛の１つを
固定指標４に合致させることにより、任意の絞り
値に設定可能である。５は絞り設定部材３に設け
た第１伝達部材で、レンズの種類（最大開放絞り
値）に関係なく、最大開放絞り値目盛から一定間
隔設けて配設されていて、この第１伝達部材５
は、レンズが装着された時、カメラボデイに設け
られ第２図の各図で左方向に付勢された第１被伝
達部材６に係合して情報伝達開始可能状態にな
り、絞り設定部材３が所望の絞り値設定位置に回
動されたとき（つまり所望の絞り値を表わす絞り
目盛が指標４に合致するよう絞り設定部材３が回
動されたとき）この第１伝達部材５は最大開放値
から設定絞り値までの段数差を、第１被伝達部材
６に伝達する様に形成されている。７は絞り設定
部材３に設けた絞りEE表示部でこれを指標４に
合致させた時、絞りが自動的に制御されることを
表示するもので、最小絞り値目盛ロに近接対応し
て配設されている。８は絞り設定部材３に設けた
第２伝達部材で、この第２伝達部材８はカメラボ
デイに設けた第２被伝達部材９と係合可能で、絞
りEE表示部７つまり最小絞り値目盛ロが指標４
に合致する最小絞り値設定位置に絞り設定部材３
が回動されたときのみ、この第２伝達部材８は当
該交換レンズの最小絞り値の情報を第２被伝達部
材９に伝達するように形成してある。 Figure 1 shows one of the interchangeable lenses of the present invention as a single unit. 1 is the interchangeable lens body, 3 is a rotatable aperture setting member, and on the outer periphery there are scales ranging from maximum aperture value to Aperture value scales up to the minimum aperture value scale RO are marked in sequence, and by matching one of the scales with the fixed index 4, an arbitrary aperture value can be set. Reference numeral 5 designates a first transmission member provided in the aperture setting member 3, which is disposed at a constant interval from the maximum aperture value scale, regardless of the type of lens (maximum aperture value).
When the lens is attached, the diaphragm setting member engages with the first transmitted member 6 provided on the camera body and is biased leftward in each figure in FIG. 2, and becomes ready to start information transmission. 3 is rotated to the desired aperture value setting position (that is, when the aperture setting member 3 is rotated so that the aperture scale representing the desired aperture value coincides with the index 4), this first transmission member 5 It is formed so that the difference in the number of steps from the open value to the set aperture value is transmitted to the first transmitted member 6. 7 is an aperture EE display provided on the aperture setting member 3, which indicates that the aperture will be automatically controlled when it matches index 4, and is arranged in close proximity to the minimum aperture value scale RO. It is set up. Reference numeral 8 denotes a second transmission member provided on the aperture setting member 3, and this second transmission member 8 is engageable with a second transmitted member 9 provided on the camera body, and is connected to the aperture EE display section 7, that is, the minimum aperture value scale. is indicator 4
Aperture setting member 3 at the minimum aperture value setting position that matches
The second transmitting member 8 is configured to transmit information on the minimum aperture value of the interchangeable lens to the second transmitted member 9 only when the lens is rotated.
絞り設定部材３に形成した第１伝達部材５及び
第２伝達部材８の先端長さは、第２図Ａ，Ｂ，
Ｃ，Ｄに示す如く、光軸方向に異つており、か
つ、第１伝達部材５は第２伝達部材８よりも短く
形成してあり、交換レンズをカメラに装着した
時、第２図Ａに示す如く、第１伝達部材は第２被
伝達部材９と係合せず、第１被伝達部材６とのみ
係合し、レンズ側の第２伝達部材８は、絞り設定
部材３が回動されて絞りEE表示部７が指標４に
合致した時のみ、第２被伝達部材９と係合する様
に形成してある。 The lengths of the tips of the first transmitting member 5 and the second transmitting member 8 formed on the aperture setting member 3 are as shown in FIGS. 2A, B,
As shown in C and D, they are different in the optical axis direction, and the first transmission member 5 is formed shorter than the second transmission member 8, so that when the interchangeable lens is attached to the camera, As shown, the first transmitting member does not engage with the second transmitted member 9, but engages only with the first transmitted member 6, and the second transmitting member 8 on the lens side does not engage with the second transmitted member 9 when the aperture setting member 3 is rotated. It is formed so that it engages with the second transmitted member 9 only when the aperture EE display section 7 matches the index 4.
尚、この第２伝達部材８の位置は、第２図Ｂ，
Ｃ，Ｄに示すように、交換レンズの種類（最小絞
り値の値）に応じて、それぞれ最小絞り値目盛ロ
からl1，l2，l3の距離だけ隔てた異なる位置に形
成してある。すなわち、一定の基準絞り値が伝達
されるように形成されていて、レンズの種類に応
じて小さい最小絞り値を有する場合は、その基準
絞り値から最小絞り値の差を更に余分に伝達する
様に形成してある。 The position of this second transmission member 8 is as shown in FIG.
As shown in C and D, they are formed at different positions separated by distances l 1 , l 2 , and l 3 from the minimum aperture value scale, respectively, depending on the type of interchangeable lens (minimum aperture value). . In other words, if the lens is designed to transmit a constant reference aperture value and has a small minimum aperture value depending on the type of lens, the lens is designed to transmit an additional amount of the difference between the reference aperture value and the minimum aperture value. It is formed in
すなわち、第２図Ｂに示す様に、最小絞り値が
F16のレンズでは、絞りEEに設定された時、第
２伝達部材８は、最小絞り値F16を伝達するため
に第２被伝達部材９を長さａだけ移動させる様に
形成してある。 In other words, as shown in Figure 2B, the minimum aperture value is
In the F16 lens, when the aperture is set to EE, the second transmitting member 8 is formed to move the second transmitted member 9 by a length a in order to transmit the minimum aperture value F16.
又、第２図Ｃに示すように、更に一段小さい最
小絞り値F22を有するレンズの場合、第２伝達部
材８′は、上記移動量ａに対して、さらにもう一
段第２被伝達部材９′を移動させる様に形成して
ある（移動量ｂ）。 Further, as shown in FIG. 2C, in the case of a lens having a minimum aperture value F22 that is one step smaller, the second transmission member 8' is moved one step further to the second transmission member 9' with respect to the above-mentioned movement amount a. (movement amount b).
さらに第２図Ｄに示すように、さらにもう一段
小さい絞り値F32を有するレンズの場合、さらに
第２被伝達部材９″をもう一段移動させる様に形
成してある（移動量Ｃ）。 Furthermore, as shown in FIG. 2D, in the case of a lens having an even smaller aperture value F32, the second transmitted member 9'' is formed to be moved one more step (movement amount C).
尚、上述の第１被伝達部材６および第２被伝達
部材９は、カメラボデイ内に設けた最大開放値演
算のための演算装置に連絡されている。 Note that the first transmitted member 6 and the second transmitted member 9 described above are connected to a calculation device for calculating the maximum open value provided within the camera body.
上述の様な構成をもつ交換レンズの１つをカメ
ラボデイに装着した後、シヤツタ速度EEを行う
場合、絞り設定部材３を所望絞り値設定位置に回
動操作する。例えば、第２図Ａに示す様に、絞り
値が2.8に設定された時、該レンズの最大開放絞
り値２から設定絞り値F2.8までの段数差を、第１
伝達部材５がカメラボデイ側の第１被伝達部材６
に伝達するので、従来と同様にシヤツタ速度EE
またはマニユアル撮影を行ない得る。 After attaching one of the interchangeable lenses having the above-mentioned configuration to the camera body, when performing shutter speed EE, the aperture setting member 3 is rotated to a desired aperture value setting position. For example, as shown in Figure 2A, when the aperture value is set to 2.8, the difference in steps from the maximum aperture value of 2 to the set aperture value of F2.8 of the lens is set to 1.
The transmission member 5 is a first transmitted member 6 on the camera body side.
As before, the shutter speed EE
Or you can do manual photography.
絞りEE撮影を行う場合は、カメラボデイ側の
シヤツタ速度設定部材の操作によつて、任意のシ
ヤツタ速度に設定した後、絞り設定部材３を回動
操作して、絞りEE表示部７、つまり最小絞り値
目盛ロを指標４に合致させると（第２図Ｂ，Ｃ，
Ｄ参照第１伝達部材５が最大開放絞り値から最小
絞り値までの段数の情報を第１開放絞り値から最
小絞り値までの段数の情報を第１被伝達部材６に
伝達すると共に、第２伝達部材８は第２伝達部材
９を当該交換レンズの最小絞り値の値に応じた量
だけ移動させる。 When performing aperture EE photography, after setting the desired shutter speed by operating the shutter speed setting member on the camera body side, rotate the aperture setting member 3 to set the aperture EE display 7, that is, the minimum When the aperture value scale B matches index 4 (Fig. 2 B, C,
See D. The first transmission member 5 transmits information on the number of steps from the maximum open aperture value to the minimum aperture value to the first transmitted member 6, and also transmits information on the number of steps from the first open aperture value to the minimum aperture value, and The transmission member 8 moves the second transmission member 9 by an amount corresponding to the minimum aperture value of the interchangeable lens.
すなわち第２伝達部材８は第２被伝達部材９に
装着された交換レンズの最小絞り値の情報を伝達
するために、例えば最小絞り値がF16のレンズ
（最大開放絞り値はF2）では、第２図Ｂに示す様
に、第２被伝達部材９をａの長さ移動させるもの
である。 That is, the second transmission member 8 transmits information on the minimum aperture value of the interchangeable lens attached to the second transmission member 9. For example, for a lens with a minimum aperture value of F16 (the maximum aperture value is F2), As shown in FIG. 2B, the second transmitted member 9 is moved by a length a.
上述の第１、第２伝達部材から第１、第２被伝
達部材に伝達された情報を、カメラボデイ内の演
算機構（機械的又は電気的）によつて演算するこ
とにより、装着された交換レンズの開放絞り値を
得ることができ、これによつて絞りEEの際に実
際の撮影時に自動制御される絞り値を絞り込み動
作開始前の時点で表示することができる。 The information transmitted from the above-mentioned first and second transmission members to the first and second transmitted members is calculated by a calculation mechanism (mechanical or electrical) in the camera body, and the attached replacement The open aperture value of the lens can be obtained, and thereby the aperture value that is automatically controlled during actual shooting during aperture EE can be displayed before the stop-down operation starts.
尚、装着された交換レンズが第２図Ｃ，Ｄの場
合についても、同様に第２伝達部材８は当該装着
された交換レンズの最小絞り値の情報を伝達する
ものである。 Incidentally, even when the attached interchangeable lens is shown in FIGS. 2C and 2D, the second transmission member 8 similarly transmits information on the minimum aperture value of the attached interchangeable lens.
すなわち、第２図Ｃの交換レンズ、つまり最小
絞り値がF22（最大開放絞り値はF2.8）交換レン
ズが装着されている時において、絞り設定部材３
のEE表示部７を指標４に合致させた時つまり最
小絞り値設定を行つた時、第２伝達部材８は、最
小絞り値がF16の交換レンズの第２伝達部材８が
第２被伝達部材９を移動させる基準量ａより、更
にF22からF16までの差の分だけ実質的に余分に
第２被伝達部材９を移動させて、当該交換レンズ
の最小絞り値F22が伝達される様な位置に形成し
てあるので、同様に、この様な種類の異なる交換
レンズであつても、第２伝達部材８′によつて第
２被伝達部材９′に、装着された交換レンズの最
小絞り値F22の情報を伝達できる。 That is, when the interchangeable lens shown in FIG. 2C, that is, the minimum aperture value is F22 (the maximum aperture value is F2.8), is attached,
When the EE display unit 7 of the interchangeable lens 7 matches the index 4, that is, when the minimum aperture value is set, the second transmission member 8 of the interchangeable lens whose minimum aperture value is F16 becomes the second transmitted member. By moving the second transmission member 9 by an amount corresponding to the difference from F22 to F16, the position is such that the minimum aperture value F22 of the interchangeable lens is transmitted. Similarly, even with different types of interchangeable lenses, the second transmitting member 8' can transmit the minimum aperture value of the attached interchangeable lens to the second transmitted member 9'. F22 information can be transmitted.
更に、第２図Ｄの交換レンズの場合、すなわち
最小絞り値がF32（最大開放絞り値F4）の交換レ
ンズが装着されている時において、絞り設定部材
３が絞りEEのための最小絞り値設定位置に設定
された時、第２伝達部材８″は、最小絞り値が
F16の交換レンズの第２伝達部材８が第２被伝達
部材９を移動させる基準量ａより、更にF32から
F16までの差の分だけ実質的に余分に第２被伝達
部材９″を移動させて、当該交換レンズの最小絞
り値F32が伝達される様な位置に形成してあるの
で、前記と同様にこの様な種類の異なる交換レン
ズであつても、第２伝達部材８″によつて第２被
伝達部材９″に、装着された交換レンズの最小絞
り値F32の情報を伝達できる。 Furthermore, in the case of the interchangeable lens shown in FIG. 2D, that is, when an interchangeable lens with a minimum aperture value of F32 (maximum open aperture value F4) is attached, the aperture setting member 3 sets the minimum aperture value for aperture EE. When set to the position, the second transmission member 8'' has a minimum aperture value of
From the reference amount a by which the second transmission member 8 of the F16 interchangeable lens moves the second transmitted member 9, further from F32.
The second transmission receiving member 9'' is substantially moved extra by the difference up to F16, and it is formed at a position where the minimum aperture value F32 of the interchangeable lens is transmitted, so it is similar to the above. Even with such different types of interchangeable lenses, information about the minimum aperture value F32 of the attached interchangeable lens can be transmitted to the second transmitted member 9'' by the second transmitting member 8''.
効 果
以上の説明から明らかなように本発明の交換レ
ンズは次の効果を奏する。Effects As is clear from the above explanation, the interchangeable lens of the present invention has the following effects.
まず第１に、絞り設定部材と一体に従来からの
第１伝達部材に加えて第２伝達部材を付設しただ
けの簡単な構成で、シヤツタ速度EE機構と絞り
EE機構を併せもつ内部測光式一眼レフレツクス
カメラへの使用が可能となる。次に、第２伝達部
材により該レンズの最小絞り値の情報がカメラボ
デイ側の第２被伝達部材に伝達されるのは、絞り
設定部材が最小絞り値設定位置に回動されたとき
であり、したがつて最大開放絞り値から最小絞り
値までの全絞り域での自動絞り制御が可能となる
ばかりか、絞りEE時の第１、第２伝達部材によ
る２つの情報の伝達は絞り設定部材の最小絞り値
設定位置への回動操作によつて一挙に行われ、情
報伝達のための操作が簡単である。さらに、従来
技術として記載したように交換レンズの最大開放
絞り値の情報を直接カメラボデイ側に伝達する伝
達部材を設ける場合と比較すると、カメラボデイ
と組合せて使用する種々の交換レンズを考えた場
合、一般に最小絞り値の値の種類が最大開放絞り
値の値の種類よりも少ないために、第２伝達部材
の最小絞り値に応じた位置差を限られたスペース
内で大きくとることができ、少々の製作誤差があ
つても正確な情報の伝達が可能であることから、
第１伝達部材で伝達される最大開放絞り値から最
小絞り値までの絞り段数差の情報と第２伝達部材
で伝達される最小絞り値の情報とにより、正確な
最大開放絞り値の情報を提供することができる。
さらに又、第２伝達部材は第１伝達部材と同様に
絞り設定部材と一体に設けられており、交換レン
ズのカメラボデイに対する接合面に設けられてい
るのではないから、シヤツタ速度EE機構のみ備
えた従来からの内部測光式一眼レフレツクスカメ
ラにも本発明の交換レンズは問題なく使用でき
る。 First of all, it has a simple configuration that only includes a second transmission member in addition to the conventional first transmission member integrated with the diaphragm setting member, and the shutter speed EE mechanism and diaphragm
It can be used with internal metering single-lens reflex cameras that also have an EE mechanism. Next, information on the minimum aperture value of the lens is transmitted by the second transmission member to the second transmitted member on the camera body side when the aperture setting member is rotated to the minimum aperture value setting position. , Therefore, not only is automatic aperture control possible over the entire aperture range from the maximum open aperture value to the minimum aperture value, but also the transmission of two pieces of information by the first and second transmission members during aperture EE is performed by the aperture setting member. This is done all at once by rotating the lens to the minimum aperture value setting position, and the operation for transmitting information is simple. Furthermore, compared to the case of providing a transmission member that directly transmits information on the maximum aperture value of an interchangeable lens to the camera body as described as the prior art, when considering various interchangeable lenses used in combination with the camera body, Generally, the number of types of minimum aperture values is smaller than the number of types of maximum aperture values, so the positional difference according to the minimum aperture value of the second transmission member can be made large within a limited space. Because it is possible to transmit accurate information even if there are slight manufacturing errors,
Accurate maximum aperture value information is provided by the information on the difference in the number of aperture steps from the maximum aperture value to the minimum aperture value transmitted by the first transmission member and the information on the minimum aperture value transmitted by the second transmission member. can do.
Furthermore, like the first transmission member, the second transmission member is provided integrally with the diaphragm setting member, and is not provided on the joint surface of the interchangeable lens with the camera body, so it is equipped with only the shutter speed EE mechanism. The interchangeable lens of the present invention can also be used with conventional internal photometry type single-lens reflex cameras without any problems.
すなわち、そのようなカメラに本発明の交換レ
ンズを装着しても、第２伝達部材がその装着の邪
魔になることがない。加えて、第１伝達部材の絞
り設定部材からの突出量を第２伝達部材の絞り設
定部材からの突出量よりも小さくし、該レンズが
カメラボデイに装着されたとき第１被伝達部材と
のみ係合し、第２伝達部材は絞り設定部材が最小
絞り値設定位置に回動されたときのみ第２被伝達
部材と係合するように構成してあるため、該レン
ズのカメラボデイへの装着に際し、第１伝達部材
が第２被伝達部材に係合して装着を妨げることが
なくなつて、スムーズに装着が行える。 That is, even if the interchangeable lens of the present invention is attached to such a camera, the second transmission member will not interfere with the attachment. In addition, the amount of protrusion of the first transmission member from the aperture setting member is made smaller than the amount of protrusion of the second transmission member from the aperture setting member, so that when the lens is attached to the camera body, only the first transmission member is connected. The second transmitting member is configured to engage with the second transmitted member only when the aperture setting member is rotated to the minimum aperture value setting position, so that the lens is attached to the camera body. At this time, the first transmitting member does not engage with the second transmitted member and hinder the mounting, so that the mounting can be carried out smoothly.
第１図は本発明一実施例の交換レンズの１つを
単体で示した斜視図、第２図はその実施例の交換
レンズをカメラボデイに装着した場合の情報伝達
の様子を示す模式的な平面図で、第２図Ａは最小
絞り値、最大絞り値がそれぞれF16，F2のレンズ
の場合に絞りをF2.8に設定した状態を示す図、第
２図Ｂは最小絞り値、最大開放絞り値がそれぞれ
F16，F2のレンズの場合に最小絞り値F16を設定
した状態を示す図、第２図Ｃは最小絞り値、最大
開放絞り値がそれぞれF2.8，F22のレンズの場合
に最小絞り値F22を設定した状態を示す図、第２
図Ｄは最小絞り値、最大開放絞り値がそれぞれ
F4，F32のレンズの場合に最小絞り値F32を設定
した状態を示す図である。
３……絞り設定部材、イ……最大開放絞り値目
盛、ロ……最小絞り値目盛、４……固定指標、５
……第１伝達部材、６……第２被伝達部材、８…
…第２伝達部材、９……第２被伝達部材。
Fig. 1 is a perspective view of one of the interchangeable lenses according to an embodiment of the present invention, and Fig. 2 is a schematic diagram showing how information is transmitted when the interchangeable lens of the embodiment is attached to a camera body. In the plan view, Figure 2A shows the lens with the minimum aperture value and maximum aperture value F16 and F2, respectively, with the aperture set to F2.8, and Figure 2B shows the minimum aperture value and maximum aperture value. Each aperture value
Figure 2C shows the state in which the minimum aperture value is set to F16 for lenses with F16 and F2. Figure 2C shows the minimum aperture value of F22 when the minimum aperture value and maximum aperture value are F2.8 and F22, respectively. Diagram showing the set state, 2nd
Diagram D shows the minimum aperture value and maximum aperture value, respectively.
FIG. 7 is a diagram showing a state in which the minimum aperture value F32 is set for lenses of F4 and F32. 3...Aperture setting member, A...Maximum aperture value scale, B...Minimum aperture value scale, 4...Fixed index, 5
...First transmission member, 6...Second transmitted member, 8...
...Second transmission member, 9...Second transmitted member.
Claims (1)
ンズにおいて、該レンズの最大開放絞り値から最
小絞り値までの絞り値を表わす絞り目盛が周方向
に沿つて順次印され、その絞り目盛の所望の１つ
を固定指標に合致させるレンズ光軸まわりの回動
操作により固定指標に合致した絞り目盛で表わさ
れる絞り値を設定可能な絞り設定部材と、該絞り
設定部材の周方向に該レンズの最大開放絞り値の
値に関係なく最大開放絞り値目盛から一定距離隔
てた位置に該絞り設定部材と一体に設けられ、該
レンズがカメラボデイに装着されたときカメラボ
デイ側の第１被伝達部材と係合すると共に、該絞
り設定部材が最大開放絞り設定位置から所望の絞
り値設定位置に回動されたとき該レンズの最大開
放絞り値からその設定絞り値までの絞り段数差に
対応した距離を移動することにより、その絞り段
数差の情報を上記係合を介して上記第１被伝達部
材に伝達する第１伝達部材と、該絞り設定部材の
周方向に該レンズの最小絞り値の値に依存した距
離だけ最小絞り値目盛から隔てた位置に該絞り設
定部材と一体に設けられ、該絞り設定部材が最小
絞り値設定位置へ回動されたとき、該レンズの最
小絞り値に依存した位置を占めることにより、カ
メラボデイ側の第２被伝達部材に係合してその第
２被伝達部材に該レンズの最小絞り値の情報を伝
達する第２伝達部材とを備え、第１、第２伝達部
材が絞り設定部材からレンズ光軸方向後方に突出
しており、第１伝達部材の絞り設定部材からの突
出量が第２伝達部材の絞り設定部材からの突出量
よりも小さく設定され、該レンズがカメラボデイ
に装着されたとき第１伝達部材が第１被伝達部材
とのみ係合し、第２伝達部材は絞り設定部材が最
小絞り値設定位置に回動されるときのみ第２被伝
達部材と係合するように構成された交換レンズ。1. In an internal metering type single-lens reflex camera interchangeable lens, an aperture scale representing the aperture value from the maximum aperture value to the minimum aperture value of the lens is sequentially marked along the circumferential direction, and the desired 1 of the aperture scale is marked. an aperture setting member capable of setting an aperture value represented by an aperture scale that matches the fixed index by rotational operation around the optical axis of the lens that matches the fixed index; It is provided integrally with the aperture setting member at a position separated from the maximum aperture value scale by a certain distance regardless of the aperture value, and engages with the first transmitted member on the camera body side when the lens is attached to the camera body. At the same time, when the aperture setting member is rotated from the maximum aperture setting position to the desired aperture value setting position, it moves a distance corresponding to the difference in the number of aperture steps from the maximum aperture value of the lens to the set aperture value. By doing so, the first transmitting member transmits the information on the difference in the number of aperture steps to the first transmitted member through the engagement, and the aperture setting member is provided with a first transmitting member that transmits information on the difference in the number of aperture steps to the first transmitted member, and the aperture setting member is arranged in a circumferential direction depending on the value of the minimum aperture value of the lens. is provided integrally with the aperture setting member at a position separated from the minimum aperture value scale by a distance of a second transmission member that engages with a second transmission member on the camera body side to transmit information on the minimum aperture value of the lens to the second transmission member; The member protrudes rearward in the lens optical axis direction from the aperture setting member, and the amount of protrusion of the first transmission member from the aperture setting member is set smaller than the amount of protrusion of the second transmission member from the aperture setting member, and the lens When attached to the camera body, the first transmission member engages only with the first transmitted member, and the second transmission member engages with the second transmitted member only when the aperture setting member is rotated to the minimum aperture value setting position. Interchangeable lenses configured to engage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28003384A JPS612138A (en) | 1984-12-29 | 1984-12-29 | Exchanging lens for internal photometric type single-lens reflex camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28003384A JPS612138A (en) | 1984-12-29 | 1984-12-29 | Exchanging lens for internal photometric type single-lens reflex camera |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14791482A Division JPS5840533A (en) | 1982-08-26 | 1982-08-26 | Exchange lens for internal photometric type single-lens reflex camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS612138A JPS612138A (en) | 1986-01-08 |
| JPH0377970B2 true JPH0377970B2 (en) | 1991-12-12 |
Family
ID=17619356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28003384A Granted JPS612138A (en) | 1984-12-29 | 1984-12-29 | Exchanging lens for internal photometric type single-lens reflex camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS612138A (en) |
-
1984
- 1984-12-29 JP JP28003384A patent/JPS612138A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS612138A (en) | 1986-01-08 |
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