JP3671491B2 - Camera iris mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera diaphragm mechanism, and more particularly to a camera diaphragm mechanism applied to an optical machine such as a camera or a video camera.
[0002]
[Prior art]
Conventionally, as shown in FIG. 9, the diaphragm mechanism of this type of camera has a plurality of diaphragm blades 1 (only one diaphragm blade is shown in the figure) overlapped between a diaphragm frame 2 and a seat 3. The diaphragm frame 2 and the Kikuza 3 are fixed to the diaphragm frame body 4.
A rotation pin 5 is planted at the base end portion 1a of the diaphragm blade 1, and the rotation pin 5 is rotatably attached to a bearing hole 6 formed in the diaphragm frame 2, so that the diaphragm blade 1 is positioned on the diaphragm frame 2 in a swingable manner. A dowel pin 7 is implanted on the opposite side of the rotating pin 5 in the diaphragm blade 1, and the dowel pin 7 is engaged with a long hole-shaped guide hole 8 formed in the chrysanthemum 3. Yes.
[0003]
When the Kikuza 3 is swung clockwise or counterclockwise about the optical axis 9, the dowel pin 7 of the diaphragm blade 1 moves along the guide hole 8, so that the diaphragm blade 1 is rotated. The moving pin 5 swings in the direction approaching the optical axis 9 or the direction moving away from the optical axis 9 with the swinging fulcrum as a swing fulcrum. As a result, the aperture diameter changes.
[0004]
[Problems to be solved by the invention]
However, in the diaphragm mechanism of the conventional camera, as shown in FIG. 10, the front end 1 b of the diaphragm blade 1 arranged at a predetermined position is in the middle of reducing the aperture diameter, and the edge 1 c of the other diaphragm blade 1. May cause malfunction. Such inconvenience is caused by slightly bending the leading end 1b of the diaphragm blade 1 toward the diaphragm frame 2 and forcibly entering the leading edge 1b between the diaphragm frame 2 and the other diaphragm blade 1. Can be eliminated. However, in this case as well, there is no change in that the front end 1b abuts against the edge 1c of the other diaphragm blades 1, so there is a drawback that the diaphragm blades 1 cannot be operated smoothly.
[0005]
The present invention has been made in view of such circumstances, and an object thereof is to provide a diaphragm mechanism of a camera that can smoothly operate the diaphragm blades without bringing the diaphragm blades into contact with each other.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a plurality of diaphragm blades that are overlapped and held between a diaphragm frame and a seat, and each diaphragm blade is swingably positioned on the diaphragm frame and is seated on the seat. In the diaphragm mechanism of the camera, which is guided through the guide hole and rocks the seat of the chrysanthemum to swing the diaphragm blades according to the guide hole to change the aperture diameter, one aperture of the overlapping diaphragm blades The blade is mounted on and supported by the convex portion formed on the diaphragm frame, and the other diaphragm blade is made to enter between the convex portion and the one diaphragm blade with the peripheral surface of the convex portion as a guide surface. A camera iris mechanism characterized by matching.
[0007]
In order to achieve the above object, according to the present invention, a plurality of diaphragm blades are overlapped and held between the diaphragm frame and the star seat, and each diaphragm blade is swingably positioned on the diaphragm frame. In the diaphragm mechanism of the camera, which is guided by the chrysanthemum through the guide hole and swings the chrysanthemum to swing each diaphragm blade according to the guide hole to change the aperture diameter, the surface of the diaphragm frame A concave portion is formed, one diaphragm blade of the overlapping diaphragm blades is in contact with and supported by the surface of the diaphragm frame, the end portion of the other diaphragm blade is bent and immersed in the concave portion, and the inner peripheral surface of the concave portion is a guide surface As described above, the surface of the diaphragm frame and the one diaphragm blade are made to enter and overlap each other.
[0008]
According to the first aspect of the present invention, when the aperture diameter is changed by swinging the chrysanthemum, one diaphragm blade of the overlapping diaphragm blades is supported on the projection formed on the diaphragm frame, and The other diaphragm blade is guided by the peripheral surface of the convex portion and enters between the convex portion and the one diaphragm blade. Thus, according to the present invention, since the diaphragm blades can be overlapped without bringing the ends of the diaphragm blades into contact with each other, the diaphragm blades can be operated smoothly.
[0009]
According to the second aspect of the present invention, when the aperture diameter is changed by swinging the seat, the one diaphragm blade of the overlapping diaphragm blades moves along the surface of the diaphragm frame, and the other diaphragm The bent end of the blade is immersed in the convex portion, and the end of the other diaphragm blade is guided by the peripheral surface of the concave portion between the surface of the diaphragm frame and the one diaphragm blade. Enter. Thus, according to the present invention, since the diaphragm blades can be overlapped without bringing the ends of the diaphragm blades into contact with each other, the diaphragm blades can be operated smoothly.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a camera diaphragm mechanism according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is an assembled perspective view of a diaphragm device to which a diaphragm mechanism of a camera according to an embodiment of the present invention is applied. The diaphragm device 10 shown in the figure has a plurality of diaphragm blades 12 (only one diaphragm blade is shown in the figure) formed in a substantially crescent shape, and these diaphragm blades 12, 12,... The diaphragm frame 14 and the chrysanthemum 16 are overlapped and held. The diaphragm blades 12 are fixed to a diaphragm frame body 18 that is formed in a cylindrical shape together with the diaphragm frame 14 and the seat 16.
[0011]
A rotation pin 20 is implanted in the base end portion 11 of the diaphragm blade 12. The rotation pin 20 is rotatably attached to a bearing hole 22 formed in the diaphragm frame 14. As a result, the aperture blade 12 is positioned so as to be swingable with respect to the aperture frame 14. The diaphragm device 10 according to the present embodiment uses six diaphragm blades 12, 12... Because the bearing hole 22 is formed in six places on the diaphragm frame 14.
[0012]
A dowel pin 24 is provided on the diaphragm blade 12 so as to protrude from the opposite side of the rotating pin 20, and the dowel pin 24 is engaged with an elongated guide hole 26 formed in the chrysanthemum 16.
Accordingly, when the Kikuza 16 is swung in the clockwise direction (arrow A direction) about the optical axis 28, the dowel pin 24 of the diaphragm blade 12 slides along the guide hole 26 of the Kikuza 16 and the diaphragm blade 12 Oscillates in the direction approaching the optical axis 28 with the pivot pin 20 as a pivot point. This reduces the aperture diameter. In order to increase the aperture diameter, the star seat 16 is swung counterclockwise (arrow B direction) about the optical axis 28. As a result, the dowel pin 24 slides along the guide hole 26, and the diaphragm blade 12 swings in the direction away from the optical axis 28 with the rotation pin 20 as a swing fulcrum, so that the aperture diameter increases.
[0013]
Incidentally, as shown in FIG. 2, convex portions 32, 32... Having a tapered surface 30 are integrally formed on the diaphragm frame 14. These convex portions 32, 32... Are formed on the surface facing the diaphragm blades 12 and are formed at six locations on the concentric circles at equal intervals. These convex portions 32, 32... Are formed at positions where the end portions of the aperture blades 12, 12 overlap each other when the aperture blades 12, 12,.
[0014]
Next, the operation of the diaphragm device 10 configured as described above will be described with reference to FIGS. 3 and FIG. 5 are front views of the diaphragm device 10 as seen through the chrysanthemum 16 for easy understanding of the operation of the diaphragm blades 12, 12,... 3 and 5 show only two diaphragm blades 12A and 12B whose ends are in design contact with each other while the diaphragm blades 12, 12... Swing, and the other four diaphragm blades 12 are shown. , 12... Are omitted. 4 is a sectional view taken along line 4-4 in FIG. 3, and FIG. 6 is a sectional view taken along line 6-6 in FIG.
[0015]
1 is swung in the direction of arrow A in FIG. 1, each of the diaphragm blades 12, 12,... Swings in the direction of reducing the aperture diameter. Then, when the aperture diameter is reduced to a predetermined aperture, as shown in FIG. 3, the end portion 13B of the aperture blade 12B on the left side of the drawing out of the two aperture blades 12A and 12B abutting on the design is a convex portion. As shown in FIG. 4, it is placed on the convex portion 32 by being guided by the 32 tapered surfaces 30 and riding on the convex portion 32. At this time, the end portion 13B of the diaphragm blade 12B is located at a position that has passed a predetermined amount of the convex portion 32, and the end portion 13A of the other diaphragm blade 12A is located in front of the tapered surface 30 of the convex portion 32. Yes.
[0016]
When the diaphragm blades 12A and 12B are swung in the same direction in this state, the end portion 13A of the diaphragm blade 12A is guided to the tapered surface 30, and the end portion 13A pushes up the end portion 13B of the diaphragm blade 12B. Then, when further swung, the end portion 13A of the diaphragm blade 12A enters between the convex portion 32 and the diaphragm blade 12B as shown in FIGS.
[0017]
Thereby, in this Embodiment, it can overlap, without contacting edge part 13A, 13B of aperture blade 12A, 12B. Therefore, in the present embodiment, the diaphragm blades 12, 12... Can be operated smoothly.
In the present embodiment, six convex portions 32, 32... Are formed in correspondence with the number of the diaphragm blades 12, but the convex portions 32 are formed by two diaphragm blades whose ends abut on each other in design. What is necessary is just to form only in the position corresponding to the said contact position. If the six convex portions 32 are formed as in the present embodiment, the diaphragm blades 12, 12,... Can be diaphragmed without selecting the mounting position of the two diaphragm blades 12, 12, whose ends are in contact with each other. It can be freely assembled to the frame 14. That is, the contact between the end portions can be prevented by any one of the six convex portions 32, 32..., So that the assembling work can be saved.
[0018]
FIG. 7 is a cross-sectional view of a main part showing a second embodiment of the diaphragm mechanism of the camera according to the present invention. The same or similar members as those of the diaphragm device 10 described in FIGS. Will be described.
In the embodiment shown in FIG. 7, a concave portion 36 having a tapered surface 34 is formed on the inner periphery at a position corresponding to the convex portion 32 (see FIG. 2) of the diaphragm frame 14, and the end portions are designed to meet each other. Of the two diaphragm blades 12A and 12B in contact with each other, the end 13A of the right diaphragm blade 12A in the drawing is bent slightly toward the diaphragm frame 14 side.
[0019]
According to the second embodiment, when the aperture diameter is reduced to a predetermined aperture, as shown in FIG. 7, among the two aperture blades 12A and 12B whose ends are in contact with each other by design, The diaphragm blade 12B moves along the surface of the diaphragm frame 14 so that the end portion 13B of the diaphragm blade 12B faces the concave portion 36, and the end portion 13A of the diaphragm blade 12A enters the concave portion 36. When the diaphragm blades 12A and 12B are further swung in the same direction in this state, the end portion 13A of the diaphragm blade 12A is guided by the tapered surface 30 and starts to retreat from the concave portion 36, and the end portion 13A The end 13B of the blade 12B is pushed up. Then, when further swung, the end portion 13A of the diaphragm blade 12A enters between the surface of the diaphragm frame 14 and the diaphragm blade 12B as shown in FIG.
[0020]
Thereby, also in 2nd Embodiment, since it can superimpose without contacting edge part 13A, 13B of aperture blade 12A, 12B, an aperture blade can be operated smoothly.
[0021]
【The invention's effect】
As described above, according to the diaphragm mechanism of the camera according to the present invention, one of the overlapping diaphragm blades is mounted on and supported by the convex portion formed on the diaphragm frame, and the other diaphragm blade is guided by the peripheral surface of the convex portion. Then, the diaphragm blades are allowed to move smoothly between the convex portion and one of the diaphragm blades, so that the diaphragm blades can be operated smoothly.
[Brief description of the drawings]
FIG. 1 is an assembled perspective view of a diaphragm device according to a first embodiment to which a diaphragm mechanism of a camera of the present invention is applied. FIG. 2 is a perspective view of a diaphragm frame of the diaphragm device shown in FIG. FIG. 4 is a sectional view taken along line 3-3 in FIG. 3. FIG. 5 is a view explaining operation of the camera iris mechanism. FIG. 6 is seen from line 6-6 in FIG. FIG. 7 is a cross-sectional view of the main part of the diaphragm mechanism of the camera showing the second embodiment. FIG. 8 is an explanatory diagram of the operation of the diaphragm mechanism of the camera shown in FIG. 7. FIG. Perspective view [FIG. 10] Plan view of the diaphragm device showing the state where the ends of the diaphragm blades are in contact with each other [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Diaphragm apparatus 12 ... Diaphragm blade 14 ... Diaphragm frame 16 ... Chrysanthemum 18 ... Diaphragm frame bodies 30 and 34 ... Tapered surface 32 ... Convex part 36 ... Concave part

Claims (2)

A plurality of diaphragm blades are overlapped and held between the diaphragm frame and the Kikuza, and each diaphragm blade is swingably positioned on the diaphragm frame and guided to the Kikuza via a guide hole. In a diaphragm mechanism of a camera that swings each diaphragm blade according to the guide hole to change the aperture diameter.
One diaphragm blade of the overlapping diaphragm blades is mounted on and supported on a convex portion formed on the diaphragm frame, and the other diaphragm blade is supported by the peripheral surface of the convex portion as a guide surface. A diaphragm mechanism of a camera, which is characterized by being placed between and overlapping. A plurality of diaphragm blades are overlapped and held between the diaphragm frame and the Kikuza, and each diaphragm blade is swingably positioned on the diaphragm frame and guided to the Kikuza via a guide hole. In a diaphragm mechanism of a camera that swings each diaphragm blade according to the guide hole to change the aperture diameter.
A concave portion is formed on the surface of the diaphragm frame, one diaphragm blade of the overlapping diaphragm blades is in contact with and supported on the surface of the diaphragm frame, an end portion of the other diaphragm blade is bent and immersed in the concave portion, and An aperture mechanism for a camera, wherein an inner peripheral surface is used as a guide surface to enter and overlap between the surface of the aperture frame and the one aperture blade.

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