JP2021043382A - Diaphragm device - Google Patents

Abstract

To provide a diaphragm device capable of switching plural kinds of aperture shapes at an arbitrary diaphragm position, while realizing the manual operation of a diaphragm aperture diameter.SOLUTION: A diaphragm device includes: a first group of plural diaphragm blades and a second group of plural diaphragm blades in which a rotation center member and a driving pin are fixed; first to third rotary members; a supporting member supporting the first to third rotary members; and an operating member operating the rotations of the first rotary member. The diaphragm device has switching means coupled with the second to third rotary members so as to rotation-drive them independently from the first rotary member, rotates the second to third rotary members in conjunction with each other, and can switch the first to second groups of plural diaphragm blades forming apertures.SELECTED DRAWING: Figure 1

Description

The present invention relates to a diaphragm device used in a lens device for photography, and more particularly to a diaphragm device whose aperture aperture diameter is changed by a rotation operation, a lens device having the diaphragm, and an imaging device.

Conventionally, a plurality of diaphragm blades equipped with a rotating shaft are arranged at equal angles on the same circumference, and the diaphragm opening formed by overlapping the inner edges of the diaphragm blades is changed by the rotation around the rotating shaft of the diaphragm blades. There is a known squeezing device. In such a diaphragm device, the diaphragm blades are provided with a rotation center pin and a drive pin, and the position of the drive pin with respect to the rotation center pin supported at a fixed position is determined by a cam groove formed in a disk-shaped cam plate. The guiding structure is common.

In addition, the aperture of the diaphragm of the lens device not only determines the amount of light, but the shape of the aperture is closely related to the blurred image of light, the number of diaphragm blades is related to the number of light beams, and so on.

Preferred video effects differ depending on the subject and the photographer. However, in the diaphragm mechanism of Patent Document 1, since the number of diaphragm blades is fixed, the opening shape is also limited to one type. In Patent Document 2, since two aperture devices are provided, it is possible to have two types of aperture shapes, but manual and electric switching can be performed only at the aperture open position, and in addition, the aperture operating ring can be switched when electric. The aperture opening cannot be changed manually. That is, in the conventional technique disclosed in Patent Document 2 above, since the photographer cannot change the aperture aperture shape at an arbitrary aperture position, the desired image effect cannot be obtained, which may affect the photographing.

Japanese Patent No. 614010 Japanese Unexamined Patent Publication No. 2000-047085

An object of the present invention is to provide a diaphragm device capable of switching a plurality of types of aperture shapes at an arbitrary diaphragm position while realizing manual operation of the diaphragm aperture diameter.

In order to achieve the above object, the diaphragm device according to the present invention is
A first plurality of diaphragm blade groups to which a rotation center member and a drive pin are fixed, a second plurality of diaphragm blade groups, a first to third rotating members, and the first to third rotating members. In a squeezing device including a support member for supporting the first rotating member and an operating member for operating the rotation of the first rotating member, the squeezing device uses the second to third rotating members as the first rotating member. The first to second diaphragm blades have a switching means connected so as to be rotatable and driveable independently of the diaphragm, and the second to third rotating members are interlocked to rotate to form an opening. The feature is that the group can be switched.

According to the present invention, it is possible to provide a diaphragm device capable of switching a plurality of types of aperture shapes at an arbitrary diaphragm position while realizing manual operation of the diaphragm aperture diameter.

It is an exploded perspective view of the diaphragm mechanism in the Example of this invention. It is a view from the side of the first plurality of diaphragm blades of the cam plate in the Example of this invention. It is a view from the side of the second plurality of diaphragm blades of the cam plate in the Example of this invention. It is a view from the drive pin side of the 1st diaphragm blade in the Example of this invention. It is a view from the rotation center pin side of the 2nd diaphragm blade in the Example of this invention. It is a figure of the 1st blade support member in the Example of this invention. It is a figure of the 2nd blade support member in the Example of this invention. It is a view from the side of the first plurality of diaphragm blades in the diaphragm open state of the diaphragm mechanism in the Example of this invention. It is a view from the side of the 2nd plurality of diaphragm blades in the diaphragm open state of the diaphragm mechanism in the Example of this invention. It is a vertical cross-sectional view of the drawing mechanism in the Example of this invention. It is a view from the side of the first plurality of diaphragm blades when the opening is formed by the first plurality of diaphragm blades in the small diaphragm state of the diaphragm mechanism in the Example of this invention. It is a view from the side of the 2nd plurality of diaphragm blades when the opening is formed by the 1st plurality of diaphragm blades in the small diaphragm state of the diaphragm mechanism in the Example of this invention. It is a view from the side of the first plurality of diaphragm blades when the opening is formed by the second plurality of diaphragm blades in the small diaphragm state of the diaphragm mechanism in the Example of this invention. It is a view from the side of the 2nd plurality of diaphragm blades when the opening is formed by the 2nd diaphragm blades of the diaphragm mechanism in the small diaphragm state in the Example of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Preferred embodiments of the present invention will be described in detail in FIGS. 1 to 14 based on the illustrated examples.

An exploded perspective view of this embodiment is shown in FIG.

As shown in FIG. 1, the diaphragm device 100 includes a diaphragm support ring 1, a cam plate (cam member) 2, a cam plate holding washer 3, a first and second diaphragm blades 4 and 5, and a first diaphragm device 100. , The second blade support members 6 and 7, and the first and second blade support member holding washers 8 and 9. Further, the diaphragm device 100 also includes a diaphragm operating member 10, an operating member connecting pin 11, and a switching unit 12, where o indicates the center of the optical axis. The optical axis is a term that refers to the optical axis of a lens device to which the diaphragm device of the present invention is mounted and fixed.

When the diaphragm device is mounted on the lens device, it is mounted so that the center of the opening formed by the diaphragm blades coincides with the optical axis of the lens device to which the diaphragm device is mounted. Therefore, in the description of the present specification, the optical axis position is treated as synonymous with the position of the center of the opening formed by the diaphragm blades and the position of the center of rotation of the cam plate. The drawing device 100 is incorporated in the base ring 13 and fixed by the drawing device retainer 14.

2 and 3 are views from the side of the first and second diaphragm blades of the cam plate 2, respectively.

As shown in FIGS. 2 and 3, the cam plate 2 has a first cam groove 2a for the first plurality of diaphragm blades on one surface thereof and a second cam groove 2a for the second plurality of diaphragm blades on the opposite side thereof. It has a cam groove 2b.

As shown in FIG. 4, each of the diaphragm blades 15 has a rotation center pin (rotation center member) 15a convexly provided on one side surface, and a drive pin 15b convexly provided on the opposite surface. As shown in FIG. 5, the diaphragm blade 16 differs from the diaphragm blade 15 only in the direction in which the rotation center pin 16a and the drive pin 16b are projected.

8 and 9 are views from the side of the first and second diaphragm blades of the diaphragm mechanism of the present embodiment in the throttle open state, respectively.

The first plurality of diaphragm blades 4 in this embodiment are composed of nine diaphragm blades 15, and the rotation center pin 15a is engaged with the engagement hole 6a provided in the first blade support member 6. .. The second plurality of diaphragm blades 5 are composed of six diaphragm blades 16, and the rotation center pin 16a is engaged with the engagement hole 7a provided in the second blade support member 7.

In this embodiment, the rotation center pins are provided on the diaphragm blades 15 and 16 in a convex manner, and the rotation center pins are configured to engage with the engagement holes 6a and 7a of the blade support members 6 and 7. , The present invention is not limited to this. The same effect can be obtained even if the blade support member 6 or 7 is provided with a rotation center pin and the rotation center pin is configured to engage with the rotation center hole provided in the diaphragm blade.

The switching unit 12 is composed of a drive motor 17, a switching lever 18, and a mounting sheet metal 19, and is fixed to the diaphragm support ring 1. At this time, the first and second engaging portions 18a and 18b of the switching lever 18 engage with the engaging grooves 6b and 7b of the blade support members 6 and 7, respectively.

As shown in FIG. 10, the first and second plurality of diaphragm blades 4 and 5 are sandwiched between the cam plate 2 and the blade support members 6 and 7, respectively. A cam plate 2 is rotatably connected to the diaphragm support ring 1 about the center o of the optical axis between the first and second diaphragm blades 4 and 5 (on the drive pins 15b and 16b sides). It is installed.

When the throttle operating member 10 rotatably fixed to the base member 13 by the above structure is rotated, the cam plate 2 connected to the operating member 10 by the operating member connecting pin 11 in the connecting groove 2c is connected to the throttle support ring 1. On the other hand, it rotates around the center o of the optical axis. When the cam plate 2 is rotated about the center o of the optical axis with respect to the diaphragm support ring 1, the drive pins 15b and 16b of the diaphragm blades 15 and 16 are guided along the cam grooves 2a and 2b, respectively. Then, the diaphragm blades 15 and 16 rotate about the rotation center pins 15a and 16a, respectively. Here, as shown in FIGS. 8 and 9, in the first cam groove 2a and the second cam groove 2b of the cam plate 2, the diaphragm blades in which the drive pin is engaged with the cam are released from the throttle open state of the diaphragm device. They are arranged so that the phase at which the aperture starts to be narrowed is shifted. As a result, in the small diaphragm state in which the aperture is narrowed, the aperture shape of the diaphragm is formed by only one of the first and second plurality of diaphragm blades 4 and 5.

11 and 12, respectively, show the side of the first and second diaphragm blades when the diaphragm mechanism of this embodiment is in a small diaphragm state and an opening is formed by the first plurality of diaphragm blades. It is a view from. Further, FIGS. 13 and 14, respectively, show the first and second diaphragms when the diaphragm mechanism of the present embodiment is in a small diaphragm state and an opening is formed by the second diaphragm blades. It is a view from the blade side.

The diaphragm device of this embodiment is linked to an operation by a diaphragm changeover switch (not shown), and by controlling the rotation of the drive motor 17 of the changeover unit 12, the blade support member is provided by the changeover lever 18 connected to the drive motor 17. 6 and 7 can be rotated about the center o of the optical axis independently of the cam plate 2. By rotating the blade support member 6 in the P direction around the center of the optical axis, the first plurality of diaphragm blades 4 are driven in the direction of opening the opening (R direction around the rotation center pin 15a). The second plurality of diaphragm blades 5 are driven in the closing direction (rotation center pin 16a in the S direction) by the rotation of the interlocking blade support member 7 in the Q direction around the center of the optical axis. As a result, the diaphragm device is driven from the states 11 and 12 to the states shown in FIGS. 13 and 14, and the blades forming the openings are switched from the first plurality of blades 4 to the second plurality of blades 5. be able to.

Further, if an input operation is performed in the direction opposite to the above with a changeover switch (not shown) from the state of FIGS. 13 and 14, the second plurality of blades 5 are opened to the first plurality of blades 4. It is also possible to switch the blades that form. The drive motor 17 is rotationally controlled, and the blade support member 6 is rotated in the Q direction around the center of the optical axis by the connected switching lever 18, and the blade support member 7 is rotated in the P direction around the center of the optical axis, and is independent of the cam plate 2. Can rotate. By rotating the blade support member 6 around the center of the optical axis in the Q direction, the first plurality of diaphragm blades 4 are driven in the direction of closing the opening (in the S direction around the center of rotation pin 15a). The second plurality of diaphragm blades 5 are driven in the direction of opening the opening (R direction around the rotation center pin 16a) by the rotation of the interlocking blade support member 7 in the P direction around the center of the optical axis. It is driven from the states 13 and 14 to the states shown in FIGS. 11 and 12.

At this time, since the number of the aperture blades forming the openings is different between the first plurality of blades 4 and the second plurality of blades 5, the photographer can change the opening shape by switching the blades forming the openings. It can be selected, and two types of video effects can be captured with one lens device. Further, since the aperture shape can be switched independently of the manual operation of the aperture diameter by the aperture operating member 10, a plurality of image effects can be captured at an arbitrary aperture position without impairing the operability of adjusting the amount of shooting light. It is possible. In addition, the opening areas before and after switching are made equal by setting the amount of rotation of the blade support members 6 and 7 at the time of switching by the switching unit 12 and the amount of shifting of the throttle start position of the cam groove on the cam plate 2. Therefore, the change in brightness at the time of switching can be suppressed.

In this embodiment, the shapes of the first diaphragm blade and the second diaphragm blade are different only in the directions of the rotation center pin and the drive pin, but this is not the case. Further, the difference between the opening shape due to the first plurality of diaphragms and the opening shape due to the second plurality of diaphragm blades is explained by a substantially circular diaphragm having a different number of blades (a diaphragm having an opening shape (first shape) imitating a circle). ), But this is not the case. For example, the opening shape of the first plurality of diaphragm blades is a substantially circular diaphragm, and the opening shape of the second plurality of diaphragm blades is a substantially elliptical diaphragm (a diaphragm having an opening shape (second shape) imitating an elliptical shape). ), The effect of the present invention can be obtained if the opening shapes of the two are different.

Further, in this embodiment, the rotating member (blade support member) driven by the switching unit is provided with an engaging hole that engages with the rotation center pin of the diaphragm blade, and the rotating member (cam plate) connected to the operating member is engaged with the drive pin. The configuration has a matching cam groove, but this is not the case. The effect of the present invention can be obtained regardless of whether the rotating member driven by the switching unit or the rotating member connected to the operating member is provided with an engaging hole that engages with the rotation center pin and a cam groove that engages with the driving pin. Be done.

By constructing a lens device including the diaphragm device according to the above-described embodiment, it is possible to realize a lens device that can enjoy the effects of the diaphragm device of the present invention.

Further, by configuring an imaging device including a lens device including the diaphragm device according to the above-described embodiment and a camera device connected to the lens device, an imaging device capable of obtaining the effects of the diaphragm device of the present invention can be obtained. Can be realized.

By configuring the lens adapter device including the diaphragm device according to the above-described embodiment, it is possible to realize a lens adapter device that can enjoy the effects of the diaphragm device of the present invention.

1 support ring (support member), 2 cam plate (first rotating member),
4 First multiple diaphragm blades, 5 Second multiple diaphragm blades,
6 First blade support member (second rotating member),
7 Second blade support member (third rotating member),
10 Aperture operating member, 12 Switching unit, o Optical axis center (center of opening)

Claims (11)

A first group of a plurality of diaphragm blades to which a rotation center member and a drive pin are fixed, a second group of a plurality of diaphragm blades, and a group of a second plurality of diaphragm blades.
With the first to third rotating members,
A support member that supports the first to third rotating members, and
An operating member that operates the rotation of the first rotating member, and
In the squeezing device equipped with
The diaphragm device has a switching means in which the second to third rotating members are connected so as to be rotatable and driveable independently of the first rotating member.
A diaphragm device characterized in that the first to second diaphragm blade groups forming an opening can be switched by rotating the second to third rotating members in conjunction with each other. The first rotating member includes a first cam that engages with the drive pins of the first plurality of diaphragm blades and a second cam that engages with the drive pins of the second plurality of diaphragm blades. 1. The second to third rotating members include a rotating center member supporting member that supports the rotating center members of the first to second plurality of diaphragm blades. The described diaphragm device. The first rotating member has a rotation center member supporting member that supports the rotation center members of the first and second diaphragm blades, and the second rotating member is the first plurality of diaphragm blades. It has a first cam that engages with the drive pins of the diaphragm blades, and the third rotating member has a second cam that engages with the drive pins of the second plurality of diaphragm blades. The diaphragm device according to claim 1, wherein the diaphragm device is characterized. Any one of claims 1 to 3, wherein the diaphragm device has the same opening area when the first to second diaphragm blades forming the aperture are switched. The diaphragm device according to one item. The diaphragm device according to any one of claims 1 to 4, wherein the first to second plurality of diaphragm blade groups have different numbers of diaphragm blades. In the first to second diaphragm blade groups, one aperture shape at the time of small aperture has the first shape, and the other opening shape at the time of small aperture has the second shape. The diaphragm device according to any one of claims 1 to 4, wherein the diaphragm device is characterized. The rotation center member provided on the first to second diaphragm blades is a pin convexly provided on the diaphragm blade, and the pin is provided on the first or second to third diaphragm blades. The diaphragm device according to any one of claims 1 to 6, wherein the rotation center of the diaphragm blade is formed by engaging with the hole which is the rotation center member support member. The rotation center member provided on the first to second diaphragm blades is an engagement hole provided in the diaphragm blade, and the first or second to third rotations are provided in the engagement hole. The diaphragm according to any one of claims 1 to 6, wherein the rotation center of the diaphragm blade is defined by engaging with a pin which is a rotation center member support member provided on the member. apparatus. A lens device having the diaphragm device according to any one of claims 1 to 8. An imaging device including the lens device according to any one of claims 1 to 9 and a camera device connected to the lens device. A lens adapter device having the diaphragm device according to any one of claims 1 to 8.

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