JPS6246169Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an iris shutter that controls the luminous flux diameter of the light and also blocks light.

Conventional examples are shown in FIGS. 1 and 2. In other words, 1 is the iris shutter body, 2 is a cutter guide plate, 3 is a movable blade guide plate, 4 is a cutter, 5 is a movable blade, 6 is a guide pin for driving the cutter, and 7 is a cutter provided on the guide plate 2. 8 is the cutter rotation center, 9 is the lever, 10 is the blade guide groove provided on the guide plate 3, 11 is the blade pin, and the cutter 4 is located between the cutter guide plate 2 and the main body 1. As the cutter guide plate 2 rotates, the cutter guide pin 6 is guided by the cutter guide groove 7 to close the cutter 4, and the cutter guide plate 2 and the movable blade guide plate 3 are connected to the connecting fitting 12. The movable blade 5 is integrated with the lever 9 by rotating the guide plate 3 through the pin 11 and the guide groove 10.

However, in this iris shutter, since the cutter 4 moves between the cutter guide plate 2 and the main body 1, it is subjected to resistance due to the contact friction of each, and the movement is not smooth. In addition, two guide plates are required, one for the movable blade and one for the cutter, which is disadvantageous in terms of cost.

Therefore, the purpose of this invention is to provide an iris shutter that can smoothly operate the cutter, reduce costs, and improve the life of the shutter.

An embodiment of this invention is shown in FIGS. 3 to 5. That is, this iris shutter has a guide plate 1 in a recess 14 of an iris shutter body 13.
5 in a rotatable manner, and screw 16 for the guide plate.
and connect the connecting fittings 17a to the edge of the guide plate 15.
Attach the operating lever 17 via the guide plate 15.
A guide groove 18 having a longitudinal direction in the radial direction is formed with a number of movable blades in the circumferential direction at predetermined intervals. In addition, a contact portion 19 is provided between the pair of guide grooves, and the contact portion 1
A cutter guide pin 20 is provided on 9. The movable vanes 21 are stacked on one side of the guide plate 15 to form a ring, and are rotatably provided on the iris shutter body 13 by shafts 22. A movable vane pin 23 is provided at the tip of the movable vane 21. 23 is fitted into the guide groove 18. The cutter 24 is arranged on the other surface of the guide plate 15, that is, on the opposite side of the movable blade 21, and one end thereof is rotatably attached to the main body 13 outside the outer periphery of the guide plate 15 with a screw 25. A guide groove 26 having a predetermined shape is formed in the middle of the cutter guide pin 20 and is fitted into the cutter guide pin 20 .

The imaginary line in FIG. 5 shows the state in which the lever 17 has been rotated from the position shown by the solid line. That is, when the lever 17 is rotated in the direction of the arrow, the movable blade 21 moves toward the pin 2.
3 is fitted into the guide groove 18, so the movable blade 2
The circular opening 27 formed by the first ring arrangement is closed, and the cutter 24 is fitted in the guide groove 26, so it is closed across the center of the opening 27.

With this configuration, the cutter 24 is located outside the guide plate 15, so the only contact parts of the cutter 24 are the cutter guide pin 20 and the rotation center 25, and the other parts are floating, so the movement is smooth. Become. Since the guide plate 15 is a single piece, the number of parts is reduced, which is advantageous in terms of cost.
Furthermore, the cutter 24 is controlled to wobble in the direction of the abutment 19 by the abutting portion 19 of the cutter guide pin 20, and the guide plate 15 also controls the wobbling of the cutter 24 in the B direction. Movement becomes smoother.

As mentioned above, the iris shutter of this invention has a guide groove for the movable vane pin and a cutter pin on the guide plate, and a guide groove on the cutter, so the guide plate can be constructed from a single piece, making it inexpensive. Since the cutter can be placed outside the guide plate and there are only two cutters, the operation becomes smoother and the life of the shutter can be improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of the conventional example, Fig. 2 is a side view thereof, Fig. 3 is a perspective view of an embodiment of this invention, and Fig. 4 is a front view of the conventional example.
The figure is a side view, and FIG. 5 is a front view. 13...Iris shutter body, 15...Guide plate, 17...Lever, 18...Guide groove (for movable blade drive), 19...Abutting portion, 20...Pin (for cutter drive), 21... Movable blade, 23...
Pin (with movable blade), 24...Cutter, 26...
...Guide groove (for cutter).

Claims (1)

[Scope of utility model registration request] An iris shutter body, a movable blade with a pin rotatably provided on the iris shutter body, and a cutter guide groove rotatably provided on the pin side of the iris shutter body in an intermediate portion. A guide groove for driving the movable blade is formed between the provided cutter, the movable blade, and the cutter so as to be rotatably provided in the iris shutter body, and is fitted into the pin, and is fitted into the cutter guide groove. An iris shutter equipped with a guide plate with a lever and a guide pin for driving the cutter.