JPS5848648Y2 - Shibori Kaikou Hosouchi - Google Patents

Description

[Detailed description of the invention] The present invention is based on the patent application published in Japanese Utility Model Publication No. 51505 filed earlier by the present applicant.
The exposure meter linked diaphragm mechanism in the cine camera described in No. 32 was further improved, and the aperture aperture on the small aperture side of the exposure meter linked diaphragm mechanism was corrected using a neutral intensity filter (hereinafter referred to as ND filter). The present invention relates to an exposure meter interlocking diaphragm mechanism with an aperture aperture correction device that has been made as possible.

Generally, in a cine camera where the aperture aperture is automatically controlled depending on the brightness of the subject, a galvanometer for the exposure meter is used to operate at least one movable aperture blade in response to energy changes in the photocell due to the light flux from the subject. The aperture aperture correction device is equipped with an aperture aperture correction device that moves an N-D filter in conjunction with the exposure meter to the front of the charging element in the exposure meter, the optical path of the photographic lens, etc. to perform small aperture correction. Exposure meter-equipped aperture mechanisms were developed several years ago, and some of them are in practical use.

However, with the exposure meter linked diaphragm mechanism of this type of exposure meter linked diaphragm mechanism with an aperture correction device for cine cameras, the center of the diaphragm aperture tends to deviate from the optical axis of the photographic lens. In addition, those equipped with an aperture correction device have a large number of parts, and are often difficult to assemble and adjust.

In view of the above-mentioned current situation, this invention has been improved by
First, the exposure meter interlocking diaphragm mechanism is placed on both sides of the exposure meter's rotating member, which rotates depending on the brightness of the subject, and is placed in a symmetrical position with respect to the rotational axis of this rotating member, so that it cooperates with one end. The other ends of two movable aperture blades each having a window hole to form an aperture opening are rotatably supported, and these two movable aperture blades are rotated at a constant speed in conjunction with the rotation of the rotating member. The guide groove holes made in both movable diaphragm blades are loosely fitted into the fixed pins planted in the frame of the machine so that they cross overlap under the trajectory of In addition to preventing this, it also eliminates mechanical rattling, and furthermore,
One end of this is rotatably supported on the rotating member or one of the movable aperture blades, and the other end is connected to an N-D filter, and has a guide groove into which the fixed pin is loosely fitted. By attaching the N-D filter holding member, the number of parts can be reduced to the minimum, and it is also possible to easily select the timing of small aperture correction during manufacturing, and to make assembly and adjustment extremely easy. The present invention will now be described in detail with reference to the illustrated embodiments.

That is, FIGS. 1 and 2 are diagrams for explaining the configuration of essential parts of an embodiment of an exposure meter interlocking diaphragm mechanism with an aperture aperture correction device according to the present invention. Figure 2 is a front view showing a small aperture state, and shows two movable aperture blades 3 and 4, each having window holes 3a and 4a at one end to cooperate to form an aperture aperture. The other end of the movable diaphragm blade is on a rotating member 2 such as a movable coil of a galvanometer for the exposure meter 1, and a support shaft 2a installed at a symmetrical position with respect to the rotational axis of the rotating member 2. , 2b, and the first and second movable aperture blades 3, 4 swing along a fixed trajectory in conjunction with the rotation of the rotating member 2, and cross-polymerize. guide groove holes 3b and 4b provided to form an aperture opening;
They are loosely fitted around a common fixing pin 5 which is set up in the machine frame (not shown).

Further, one end of the first movable aperture blade 3 is rotatably supported by a support shaft 2a that supports one end of the first movable aperture blade 3;
The first movable aperture blade 3 is perforated approximately at the center of the N/D filter holding member 7 to which the filter 6 is connected.
The fixed pin 5 is loosely fitted into the guide groove hole 7a which has a shape different from the guide groove hole 3b, so that the aperture opening formed by the first and second movable aperture blades 3 and 4 working together becomes a small aperture. When this happens, the N-D filter holding member 7 is guided to move so that the N-D filter 6 is superimposed on the opening.

The exposure meter interlocking aperture mechanism with an aperture aperture correction device according to the present invention configured as described above uses the exposure meter 1, which operates as the brightness of the subject becomes brighter, to change the aperture from the open aperture state as shown in FIG. The aperture becomes small as shown in the figure.

That is, when the rotary member 2 rotates counterclockwise, the first movable diaphragm blade 3 is not swung counterclockwise under a constant trajectory by the guide groove hole 3b and the fixed pin 5, and the second
The movable aperture blades 4 are swung clockwise by the guide groove hole 4b and the fixed pin 5 along a constant trajectory, so that the first and second movable aperture blades 3 and 4 are rotated by the rotation member 2. The window holes 3a and 4 are interlocked with the rotation, are overlapped with each other under a certain trajectory, and cooperate to form a variable aperture aperture.
a comes to form a small aperture.

At the same time, the N-D filter holding member 7 is also moved in a direction in which the N-D filter 6 is overlapped with the diaphragm opening that has begun to form the small diaphragm aperture by the same principle. On the side, the N/D filter 6 overlaps the diaphragm aperture and corrects the small diaphragm aperture.

As is clear from the above description, in the exposure meter interlocking diaphragm mechanism with an aperture aperture correction device according to the present invention, on both sides of the rotating member 2 in the exposure meter 1, with respect to the rotation axis of the rotating member 2, Two movable aperture blades 3 and 4, one end of which is rotatably supported at symmetrical positions, and an N-D aperture blade rotatably supported on the rotating member 2 or one of the movable aperture blades. The filter holding member 7 refers to the respective guide groove holes 3b and 4.
A common fixing pin 5 is loosely fitted in b and 7a, and is linked to the rotation of the only rotating member 2, so that the two movable members are cross-overlapping or superimposed on a fixed trajectory. The window holes 3 a and 4 a provided in each of the aperture blades 3 and 4 to form the aperture aperture are approximately symmetrical with respect to the optical axis of the photographic lens, and of course, small aperture correction can be performed. Eliminates the center of the aperture aperture from being significantly deviated from the optical axis of the photographic lens, makes it extremely easy to correct small apertures using the N-D filter, reduces the number of parts to the bare minimum, and prevents mechanical rattling. This invention has excellent practical effects, such as making it possible to prevent the problem from occurring and make it lightweight and compact, which is necessary for cine cameras, as well as making it easier to select the timing of small aperture correction during production. This can be said to have made it possible to provide an exposure meter interlocking diaphragm mechanism with an aperture aperture correction device that is optimal for use.

[Brief explanation of the drawing]

The drawings are explanatory views of the main parts of an embodiment of the exposure meter interlocking diaphragm mechanism with an aperture aperture correction device according to the present invention. They are shown below. 1; Exposure meter, 2; Rotating member, 2a, 2b; Support shaft, 3; First movable aperture blade, 3a, 4a: Window hole, 3b, 4b: Guide groove hole, 4; Second movable aperture blade, 5 ;Fixing pin, 6;N・
D. Filter, 7; N-D. Filter holding member, 7
a; Guide groove hole.

Claims (1)

[Scope of utility model registration request] On both sides of the rotary member of the exposure meter that rotates according to the brightness of the subject, diaphragm apertures should be formed at one end in symmetrical positions with respect to the rotational axis of the rotary member. The other ends of two movable diaphragm blades each having a window hole are rotatably supported, and the two movable diaphragm blades are linked to the rotation of a rotating member so that the two movable diaphragm blades cross and overlap under a constant trajectory. Guide slots formed in both movable aperture blades are loosely fitted into fixed pins planted in the machine frame, one end is rotatably supported on the rotating member or one of the movable aperture blades, and the other end is A neutral density filter is connected to the neutral density filter, and the neutral density filter has a guide groove into which the fixing pin is loosely fitted.
A filter holding member is attached, and as the rotary member rotates, both movable aperture blades overlap and the aperture formed by the aperture becomes a small aperture.
An exposure meter linked aperture mechanism with an aperture aperture correction device, characterized in that a filter is overlapped with the aperture aperture to perform small aperture correction.