JPH02730Y2 - - Google Patents
Info
- Publication number
- JPH02730Y2 JPH02730Y2 JP1979173970U JP17397079U JPH02730Y2 JP H02730 Y2 JPH02730 Y2 JP H02730Y2 JP 1979173970 U JP1979173970 U JP 1979173970U JP 17397079 U JP17397079 U JP 17397079U JP H02730 Y2 JPH02730 Y2 JP H02730Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- window
- receiving
- blade
- hole
- 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
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Landscapes
- Diaphragms For Cameras (AREA)
- Exposure Control For Cameras (AREA)
Description
【考案の詳細な説明】
本考案はカメラの受光部の羽根に関するもので
ある。[Detailed Description of the Invention] The present invention relates to a blade of a light receiving section of a camera.
上記した受光羽根は、一枚の羽根に受光素子を
露出させるアナを形成する窓を有し、この窓の小
面積部から大面積部への移動を受光部の前面にお
いて行うようにし、この窓と受光部の窓である受
光窓とが重なつて形成されるアナの大きさを変え
るようにするものである。 The above-mentioned light-receiving blade has a window forming a hole that exposes the light-receiving element in one blade, and the movement of this window from the small-area part to the large-area part is performed in front of the light-receiving part. This is to change the size of the hole formed by the overlap of the light-receiving window which is the window of the light-receiving part.
従来の受光羽根は、その作動によつて受光窓に
光の入射を許すアナを形成する窓を設け、そのア
ナが極めて小さい状態のとき、受光羽根の作動量
に比較してアナの面積の変化量を小さくするた
め、窓の一部に溝状の切込部を形成し、この切込
部が受光窓の周縁部で進退するようにしていた。 Conventional light-receiving blades have a window that forms a hole that allows light to enter the light-receiving window when the blade is operated, and when the hole is extremely small, the area of the hole changes compared to the amount of operation of the light-receiving blade. In order to reduce the amount, a groove-shaped notch is formed in a part of the window, and this notch moves forward and backward at the peripheral edge of the light-receiving window.
従つてこのような窓が受光窓と重なると、溝状
の切込部が受光窓内に現われてからアナを次第に
大きくする方向へ移動し、遂には切込部の端部が
受光窓の外へ退ぞいたとき、受光窓内には受光羽
根が窓に二分されて２個所に別れた状態で見え
る。 Therefore, when such a window overlaps the light-receiving window, a groove-shaped notch appears inside the light-receiving window and then moves in a direction that gradually enlarges the hole until the end of the notch extends outside the light-receiving window. When you step back, you can see the light-receiving blade divided into two parts inside the light-receiving window.
受光窓内に現われた溝状の切込部は、上記した
ように受光窓の２個所を受光羽根で覆いながら、
その覆つている部分の夫々を次第に両方の側へ退
ぞけるようにしてアナの大きさを拡げ、即ち受光
窓に対して受光羽根はその作動によつて窓をその
溝状の切込部の幅の狭い部分から広い部分へと移
動させ、これによつて受光羽根の作動量に比較し
て受光窓内において形成するアナの面積の変化量
を小さくすることができるため、受光羽根の作動
量に対するアナの面積の変化量を所定比率で制御
するために極めて有効な構成であつた。 The groove-shaped notch that appears in the light receiving window is created by covering two parts of the light receiving window with light receiving blades as described above.
The size of the hole is expanded by gradually moving each of the covered parts to both sides, that is, the light-receiving blades move the window into the groove-like notch by its operation. By moving the width from the narrow part to the wide part, it is possible to reduce the amount of change in the area of the hole formed within the light receiving window compared to the amount of operation of the light receiving blade. This is an extremely effective configuration for controlling the amount of change in the area of the hole at a predetermined ratio.
しかるに、通常上記受光窓の大きさは撮影用レ
ンズ等に比較すると、その直径は格段に小さく、
精々数粍程度、例えば直径が２・２粍位であるか
ら、受光羽根の窓における溝状の切込部の幅も最
も狭い先端部では０・２粍位であり、これはプレ
ス抜き加工を行う数値として極めて微小な寸法で
ある。 However, the diameter of the light receiving window is usually much smaller than that of a photographic lens, etc.
Since the diameter is at most a few millimeters, for example, about 2.2 millimeters, the width of the groove-like cut in the window of the light receiving blade is also about 0.2 millimeters at the narrowest tip, which requires press punching. The dimensions are extremely small considering the numerical value to be measured.
受光羽根は通常、薄板状材料により成り、従つ
て上記した窓の加工は、量産に適するプレス加工
によつて行われるが、上記したような極めて微小
な溝状の切込部をプレス加工で形成せしめること
は、プレス用金型の加工が極めて困難である許り
ではなく、金型の耐久性も極めて劣悪であり、頻
繁に金型を交換しなくてはならないなど、従来の
受光羽根は、その窓における細隙溝状切込部の加
工が極めて困難である欠点があつた。 The light-receiving blade is usually made of a thin plate-like material, and therefore the above-mentioned window processing is performed by press processing, which is suitable for mass production. Not only is it extremely difficult to process the press mold, but the durability of the mold is also extremely poor, and the mold must be replaced frequently. The drawback was that it was extremely difficult to process the slit groove-like cuts in the window.
本考案は、如上従来技術の欠点に鑑み、受光羽
根に対し、細い隙間である溝状切込部を形成する
ことなく受光羽根の移動量に比較して受光窓に形
成されるアナが小面積の時にはその変化量が小さ
くなるようにした受光羽根を提供する。 In view of the shortcomings of the prior art described above, the present invention does not form a groove-like notch, which is a narrow gap, in the light-receiving blade, and the hole formed in the light-receiving window has a small area compared to the amount of movement of the light-receiving blade. To provide a light-receiving blade whose amount of change is small when .
以下、上記について図面によりさらに詳細な説
明をする。 Hereinafter, the above will be explained in more detail with reference to the drawings.
はじめに、従来の受光羽根について第１図で説
明する。 First, a conventional light-receiving blade will be explained with reference to FIG.
１は受光窓、２は溝状の切込部２a1、大面積形
成縁部２a2よりなる窓２ａを形成してなる受光羽
根、３は受光羽根２の作動のガイドである。 1 is a light-receiving window; 2 is a light-receiving blade formed with a window 2a consisting of a groove-shaped notch 2a 1 and a large-area forming edge 2a 2 ; 3 is a guide for the operation of the light-receiving blade 2;
第１図において、受光羽根２を図示してない受
光部連動式のプログラムシヤツタの開閉作動に連
動させて矢印Ａの方向へ作動させると、切込部２
a1が第１図で示したように受光窓１と重なり、こ
こでアナを形成して所定の露光面積Ｓの露光を受
光窓１に対して与えるが、この値は極めて正確で
なくてはならず溝状の切込部２a1の形状加工寸法
に高精度を要求される。 In FIG. 1, when the light-receiving blade 2 is operated in the direction of arrow A in conjunction with the opening/closing operation of a program shutter that is linked to the light-receiving unit (not shown), the notch 2
As shown in Figure 1, a 1 overlaps the light receiving window 1, forming an annular shape here and exposing the light receiving window 1 to a predetermined exposure area S, but this value must be extremely accurate. Therefore, high accuracy is required in the shape and dimensions of the groove-shaped cut portion 2a1 .
上記したような受光羽根２の窓２ａは、通常プ
レス抜き加工で形成されるが、このように加工寸
法に高精度を要求される従来の受光羽根２によれ
ば、プレスの抜き型の作成が困難である許りでな
く、耐久性に乏しく、一定期間に多数作らなくて
はならず、コストアツプの原因となる欠点を有す
るものであつた。 The window 2a of the light-receiving blade 2 as described above is usually formed by press punching, but according to the conventional light-receiving blade 2 that requires high accuracy in processing dimensions, it is difficult to create a press cutting die. Not only is it difficult, but it also has the drawbacks of poor durability and the need to make a large number of them within a certain period of time, resulting in increased costs.
本考案は、以上のごとき従来技術の改良に関す
るもので、これを第２図で示した実施例によつて
説明する。 The present invention relates to an improvement on the prior art as described above, and will be explained using the embodiment shown in FIG.
第２図において、受光羽根１２に形成される窓
１２ａは、受光羽根１２の進行方向に対して傾斜
し、進行に際して受光窓１の周辺部と交わつて窓
１２ａと受光窓１とを重ならせてアナを形成せし
めるアナ形成縁部１２a1と、アナの形成に際して
受光窓１の周辺部とは全く交わらず、常に受光窓
の外側で作動し、迂回して侵入する外光の遮断お
よび受光羽根１２の強度を補強するための補強縁
部１２a2とによつて構成され、受光羽根１２が矢
印Ａの方向へ作動すると、受光窓１に対して第２
図で示したようにアナ形成縁部１２a1で重なりは
じめて露光面積Ｓのアナを形成し、その当初はき
わめて小さい面積で、次第に大きくなる。 In FIG. 2, the window 12a formed in the light-receiving blade 12 is inclined with respect to the traveling direction of the light-receiving blade 12, and as it travels, it intersects with the peripheral part of the light-receiving window 1, causing the window 12a and the light-receiving window 1 to overlap. The hole-forming edge 12a 1 that forms the hole and the light-receiving blade do not intersect at all with the peripheral part of the light receiving window 1 when forming the hole, and always operate outside the light receiving window to block external light that bypasses and enters. When the light-receiving blade 12 operates in the direction of arrow A, the second edge against the light-receiving window 1
As shown in the figure, a hole with an exposed area S is formed when they begin to overlap at the hole forming edge 12a1 , and the area is initially very small and gradually increases in size.
以上において、アナ形成縁部１２a1の形状は必
要に応じて直線および／または曲線で形成しても
よく、また受光羽根１２の作動はガイド３によつ
て規制される以外の手段、例えば自身の一点を支
点とする揺動運動によるようにしても本考案が達
成されるものであることは勿論である。 In the above, the shape of the annular forming edge 12a1 may be formed in a straight line and/or a curved line as necessary, and the operation of the light receiving blade 12 may be controlled by means other than being regulated by the guide 3, for example, by its own control. Of course, the present invention can also be achieved by a swinging motion with one point as a fulcrum.
更に、本考案の実施が適用されるケースとして
受光部連動方式のプログラムシヤツタの受光部の
アナ制御に限定されるものではなく、絞り優先式
の露光制御を行うシヤツタ或はASA変換の設定
手段等においても適用できるものである。 Furthermore, the case where the present invention is applied is not limited to the analog control of the light receiving part of a program shutter linked to the light receiving part, but is also applicable to a shutter that performs aperture priority exposure control or a setting means for ASA conversion. It can also be applied to other countries.
本考案によれば、受光窓に小面積のアナを形成
し、その面積の変化を受光羽根の作動量に比較し
て小さくする場合、受光窓の周縁部を一辺とし、
受光羽根のアナ形成縁部を他の一辺とする溝状に
切れ込んだ形状のアナを形成してその一辺である
アナ形成縁部のみを作動させてアナの面積を変え
るようにしたものであるから、受光羽根に従来の
如き微細幅の溝状の切込部を形成することなく微
小面積のアナの制御をすることができる効果が得
られる。 According to the present invention, when a small-area hole is formed in the light-receiving window and the change in the area is made small compared to the amount of operation of the light-receiving blade, the periphery of the light-receiving window is taken as one side;
This is because a groove-shaped hole is formed with the hole-forming edge of the light-receiving blade as the other side, and the area of the hole is changed by operating only one side, the hole-forming edge. Therefore, it is possible to control the hole in a minute area without forming a groove-like notch with a minute width in the light receiving blade as in the conventional method.
如上の如く本考案においては従来のように受光
羽根に微細幅でプレス生産性の悪い微細幅の溝状
の切込み部を形成するのではなく、アナ形成縁部
と補強縁部を充分離間させて窓を形成するもので
あるから、プレス形成のための金型の加工が極め
て容易であり、且つその金型の耐久性が抜群に向
上せしめられるなど受光羽根の加工が極めて容易
にできる効果が得られる。 As mentioned above, in the present invention, instead of forming a groove-like notch with a fine width on the light receiving blade which is poor in press productivity as in the past, the hole forming edge and the reinforcing edge are spaced sufficiently apart. Since the window is formed, it is extremely easy to process the mold for press forming, and the durability of the mold is greatly improved, making it extremely easy to process the light receiving blade. It will be done.
第１図は従来例を示す要部の正面図、第２図は
本考案の実施例を示す要部の正面図である。
１……受光窓、１２……受光羽根、１２ａ……
窓、１２a1……アナ形成縁部、１２a2……補強縁
部、３……ガイド。
FIG. 1 is a front view of main parts showing a conventional example, and FIG. 2 is a front view of main parts showing an embodiment of the present invention. 1... Light receiving window, 12... Light receiving blade, 12a...
Window, 12a 1 ... Ana-forming edge, 12a 2 ... Reinforcement edge, 3 ... Guide.
Claims (1)
る受光窓と重なつてアナを形成する窓を有し、 上記した窓は受光窓内を通過するアナ形成縁部
と受光窓外を作動する補強縁部とによつて構成さ
れ、 上記したアナ形成縁部は自身の進行方向に対し
て傾斜する形状で形成され、 前記した補強縁部はアナ形成縁部から充分離さ
れて配設されてなる受光羽根。[Claim for Utility Model Registration] It is made of a sheet of thin plate-like material and has a window that overlaps with a light-receiving window that is a window of a light-receiving element to form an annular shape, and the above-mentioned window forms an annular shape that passes through the light-receiving window. The reinforcing edge operates outside the light-receiving window. The light-receiving blade is arranged sufficiently separated from the light-receiving blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979173970U JPH02730Y2 (en) | 1979-12-15 | 1979-12-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1979173970U JPH02730Y2 (en) | 1979-12-15 | 1979-12-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5692123U JPS5692123U (en) | 1981-07-22 |
| JPH02730Y2 true JPH02730Y2 (en) | 1990-01-10 |
Family
ID=29684734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1979173970U Expired JPH02730Y2 (en) | 1979-12-15 | 1979-12-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02730Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0334733Y2 (en) * | 1982-01-28 | 1991-07-23 | ||
| JPS59195217A (en) * | 1983-04-19 | 1984-11-06 | Matsushita Electric Ind Co Ltd | Optical branching device |
-
1979
- 1979-12-15 JP JP1979173970U patent/JPH02730Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5692123U (en) | 1981-07-22 |
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