JP2018066977A - Blade driving device, imaging apparatus, and optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade driving device, such as a diaphragm unit, capable of operating in a higher speed than a conventional construction.SOLUTION: A blade driving device includes a first opening having a ground plane, a blade blocking at least a part of the first opening and forming a second opening variable in its size, a first driving part driving the blade, and a second driving part driving the blade. The first driving part and the second driving part can drive the blade without interfering with each other.SELECTED DRAWING: Figure 1

Description

  One embodiment of the present invention relates to a blade driving device, an imaging device, and an optical device.

  2. Description of the Related Art Conventionally, there is a light amount adjusting device that adjusts an opening amount by operating a driven member such as a blade that covers an opening (see Patent Document 1). In such a conventional light amount adjusting device, the blades are driven by using a motor or the like.

JP2013-127527A

  In recent years, higher shutter speeds have been promoted in high-end cameras, and with the increase in shutter speed, the operating speed of the aperture is also required to be increased. However, the conventional light quantity adjusting device has a limit in increasing the operating speed of the diaphragm.

  The present invention employs the following means in order to solve the above-described problems. In the following description, in order to facilitate understanding of the invention, reference numerals and the like in the drawings are appended in parentheses, but each component of the present invention is not limited to these appendices. It should be construed broadly to the extent that contractors can technically understand.

One means of the present invention is to
A main plate (1) having a first opening (1a);
A blade (4) that shields at least a part of the first opening (1a) and forms a second opening (4a) that can be changed in size;
A first drive unit (5) for driving the blades;
A second drive unit (6) for driving the blades,
The first drive unit and the second drive unit can drive the blades without interfering with each other.
It is a blade drive device.

  Since the blade drive device having the above configuration includes the first drive unit and the second drive unit that drive the blades, the drive force of the blades can be changed according to the drive region. As a result, it is possible to drive the blades at high speed in a drive region where high speed operation is required, and to drive the blades at low speed in other drive regions.

In the blade driving device, preferably,
The first drive unit includes a first drive region that drives the blades, and the second drive unit includes a second drive region that drives the blades.

  In the blade driving device configured as described above, the blade driving speed can be adjusted, for example, by driving the blade at high speed in the first driving region and driving the blade at low speed in the second driving region.

In the blade driving device, preferably,
The first drive unit can drive the blades at a higher speed than the second drive unit,
The first driving region is a region from the widest opening state to the predetermined opening state of the second opening.

  In the blade driving device having the above-described configuration, it is possible to drive the blades at high speed particularly from a state such as a maximum aperture state to a predetermined opening state where it is desired to drive the blades at high speed.

In the blade driving device, preferably,
A first member (5) for applying a driving force from the first driving unit to the blade;
A second member (6) for applying a driving force from the second driving unit to the blades.

  In the blade driving device having the above configuration, the driving force can be transmitted to the blades independently by the first member and the second member. Thereby, when giving a driving force to a blade | wing from a 1st drive part and a 2nd drive part, it can be set as the structure which does not receive operation | movement interference.

In the blade driving device, preferably,
The first driving unit includes an arm that gives the driving force to the first member;
The second driving unit includes a gear that applies its own driving force to the second member.

  According to the blade driving device having the above configuration, since the driving force is transmitted using the arm and the gear, the backlash or other backlash is reduced compared to the configuration in which the driving force is transmitted using only the gear (gear). Can be small. For example, in an aperture unit equipped with the blade driving device, the aperture amount can be adjusted with high accuracy.

In the blade driving device, preferably,
The second drive unit is mounted on a base member configured to be rotatable, and is coupled to the blades.
The first driving unit is coupled to the base member.

  According to the blade driving device having the above configuration, the second driving unit directly drives the blade, and the first driving unit indirectly drives the blade via the second driving unit. Thereby, the first driving unit and the second driving unit can be operated at an arbitrary timing, and the driving speed of the blades can be arbitrarily adjusted.

In the blade driving device, preferably,
The first driving unit can drive the blades faster than the second driving unit.

  According to the blade driving device configured as described above, the blade driving speed can be adjusted to a high speed or a low speed at an arbitrary timing.

In the blade driving device, preferably,
The first drive unit is an electromagnetic actuator;
The second driving unit is a motor.

  The blade driving device having the above configuration can be configured to drive the blades using a motor while driving the blades at high speed using an electromagnetic actuator.

  Further, the present invention includes an imaging device or electronic device including any one of the blade driving devices described above.

  According to the imaging apparatus or the electronic apparatus, it is possible to provide a configuration including blades that are driven at a high speed in at least a predetermined region.

FIG. 3 is a plan view of the aperture unit in which the aperture opening according to the first embodiment is in a maximum aperture state. FIG. 3 is a plan view of the aperture unit in a state in which the aperture opening according to the first embodiment is approximately the same as the opening of the main plate. FIG. 3 is a plan view of the aperture unit in which the aperture opening according to the first embodiment is in a minimum aperture state. The top view of the ground plane of Embodiment 1. FIG. FIG. 3 is a plan view of the main shaft ring of the first embodiment. The top view of the cam ring of Embodiment 1. FIG. FIG. 3 is a plan view of a diaphragm blade according to the first embodiment. FIG. 3 is a plan view of the iris motor according to the first embodiment. FIG. 3 is a plan view of the stepping motor according to the first embodiment. FIG. 6 is a plan view of the surface side of a diaphragm unit in which the diaphragm aperture according to the second embodiment is in a maximum diaphragm state. The top view of the back surface side of the aperture unit in which the aperture opening of Embodiment 2 has the maximum aperture state. The top view of the surface side of the aperture | diaphragm | squeeze unit in the state which the aperture_diaphragm | restriction aperture of Embodiment 2 is comparable as the opening part of a ground plane. The top view of the back surface side of the aperture | diaphragm | squeeze unit of the state which the aperture_diaphragm | restriction aperture of Embodiment 2 is comparable as the opening part of a ground plane. FIG. 6 is a plan view of the surface side of a diaphragm unit with a diaphragm aperture according to Embodiment 2 in a minimum diaphragm state. FIG. 6 is a plan view of the rear surface side of a diaphragm unit with a diaphragm aperture of a second embodiment in a minimum diaphragm state. Sectional drawing of the aperture unit of Embodiment 2. FIG.

The diaphragm unit in the embodiment of the present invention is a diaphragm unit included in an imaging device such as a camera, and has a feature in a configuration for driving blades. Specifically, the configuration for driving the blades is characterized in that it includes a stepping motor and an iris motor. The diaphragm unit is an example of the “blade driving device” in the present invention. Hereinafter, embodiments according to the present invention will be specifically described with reference to the drawings in accordance with the following configurations. However, the embodiment described below is merely an example of the present invention and does not limit the technical scope of the present invention. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and the description may be abbreviate | omitted.
1. Embodiment 1
2. 2. Modification of Embodiment 1 Embodiment 2
4). 4. Features of the present invention Other

<1. Embodiment 1>
First, Embodiment 1 of the present invention will be described. 1 to 3 are plan views of the aperture unit of the present embodiment. 1 shows that the aperture opening 4a is in the maximum aperture state, FIG. 2 shows that the aperture aperture 4a is in the same aperture state as the aperture 1a, and FIG. 3 shows that the aperture aperture 4a is in the minimum aperture state. 4 to 9 are views in which the respective constituent elements of the aperture unit of the present embodiment are extracted. 4 shows the main plate 1, FIG. 5 shows the main shaft ring 2, FIG. 6 shows the cam ring 3, FIG. 7 shows the diaphragm blade 4, FIG. 8 shows the iris motor 5, and FIG.

  As shown in FIGS. 1 to 3, the aperture unit of the present embodiment includes a main plate 1, a main shaft ring 2, a cam ring 3, a plurality of aperture blades 4, an iris motor 5, and a stepping motor 6.

<Ground plate 1>
The ground plane 1 is formed in a disc shape centered on the optical axis, and has a circular opening 1a in the central portion including the optical axis. The main plate 1 is equipped with a main shaft ring 2, a cam ring 3, a plurality of aperture blades 4, an iris motor 5, and a stepping motor 6 that constitute an aperture unit. In the aperture unit, a cover plate (not shown) is disposed at a position facing the base plate 1. The diaphragm unit forms a blade chamber that houses the diaphragm blades 4 between the main plate 1 and the cover plate. The opening 1a is an example of the “first opening” in the present invention. The cover plate is substantially concentric with the opening 1a and has an opening having the same size as the opening 1a. When the inner diameter of the opening of the cover plate is smaller than the inner diameter of the opening 1a, the opening of the cover plate becomes the first opening.

<Spindle ring 2>
The main shaft ring 2 is an annular (ring-shaped) member having a circular outer peripheral surface 2a and an inner peripheral surface 2b with the optical axis as the center, and is disposed inside the main plate 1 in plan view. The outer peripheral surface 2 a of the main shaft ring 2 faces the peripheral surface 1 b of the main plate 1. The main shaft ring 2 is rotatably held by the main plate 1. The main shaft ring 2 has five main shafts 21 at equal positions in the circumferential direction. The main shaft ring 2 has a motor shaft 22. The main shaft 21 and the motor shaft 22 are both cylindrical projections extending in the optical axis direction. However, the main shaft 21 and the motor shaft 22 are not limited to a cylindrical shape, but may be other shapes such as a polygonal shape.

  The five main shafts 21 are respectively inserted into the main shaft holes 41 of the five diaphragm blades 4. As a result, when the main shaft ring 2 rotates, the power is transmitted to the aperture blade 4. The motor shaft 22 is connected to the arm 51 of the iris motor 5. Thus, when the iris motor 5 rotates, the power is transmitted to the main shaft ring 2. That is, the main shaft ring 2 is an intermediate member that transmits the power of the iris motor 5 to the aperture blade 4. The main shaft ring 2 is an example of the “first member” in the present invention.

<Cam ring 3>
The cam ring 3 is an annular (ring-shaped) member having a circular outer peripheral surface 3a centering on the optical axis and an inner peripheral surface 3b, and is disposed inside the main shaft ring 2 in a plan view. The outer peripheral surface 3 a of the cam ring 3 faces the inner peripheral surface 2 b of the main shaft ring 2. The cam ring 3 is rotatably held by the main plate 1. The cam ring 3 has five driven shafts 32 at equal positions in the circumferential direction. The driven shaft 32 is a cylindrical protrusion extending in the optical axis direction. However, the driven shaft 32 may have another shape such as a polygonal shape. The cam ring 3 has a ring gear 31 at a position facing the motor gear 61 of the stepping motor 6 on the outer peripheral surface 3a. The motor gear 61 and the ring gear 31 are meshed with each other.

  The five driven shafts 32 are respectively inserted into the driven shaft holes 42 of the five diaphragm blades 4. As a result, when the cam ring 3 rotates, the power is transmitted to the aperture blade 4. The ring gear 31 meshes with the motor gear 61, and when the stepping motor 6 rotates, the power is transmitted to the cam ring 3. That is, the cam ring 3 is an intermediate member that transmits the power of the stepping motor 6 to the aperture blade 4. The cam ring 3 is an example of the “second member” in the present invention.

  As described above, the main shaft ring 2 and the cam ring 3 are connected to the iris motor 5 and the stepping motor 6, respectively, and transmit power to the diaphragm blades 4 independently.

<Aperture blade 4>
The diaphragm blades 4 each have a main shaft hole 41 and a driven shaft hole 42 which are through holes. The aperture opening end 43 of the aperture blade 4 and the aperture opening end 43 of the other aperture blade 4 form an aperture opening 4a. The main shaft 21 of the main shaft ring 2 is inserted into the main shaft hole 41, and the driven shaft 32 of the cam ring 3 is inserted into the driven shaft hole 42. The diaphragm blade 4 operates in accordance with the operations of the main shaft 21 and the driven shaft 32.

<Iris motor 5>
The iris motor 5 is an electromagnetic actuator that is driven by an electromagnet that is excited by applying electric power. Further, the iris motor 5 is sometimes referred to as a moving magnet type motor, and an internal magnet rotates according to the excitation state of the electromagnet, and an arm 51 described later operates. Such an iris motor 5 is disposed on the main plate 1 and has an arm 51. The arm 51 is connected to the motor shaft 22 of the main shaft ring 2. The iris motor 5 is an actuator that operates at a higher speed than the stepping motor 6. The iris motor 5 is held at the position of the arm 51 by a magnetic force in a non-energized state at both end positions of the operation. Therefore, the position of the diaphragm blade 4 is stably maintained except during operation. The iris motor 5 is an example of the “first drive unit” in the present invention. The iris motor 5 is sometimes called a two-pole magnetized iris motor because the position of the arm 51 is held at both end positions.

<Stepping motor 6>
The stepping motor 6 is a general stepping motor that is rotated by an electromagnet excited by applying electric power. The stepping motor 6 is disposed on the main plate 1 and has a motor gear 61. The motor gear (gear) 61 meshes with the ring gear 31 of the cam ring 3 as described above. The stepping motor 6 is a motor that operates at a lower speed than the iris motor 5. The stepping motor 6 is an example of the “second drive unit” in the present invention.

<Operation of aperture unit>
Next, the operation when changing the aperture state of the aperture 4a will be specifically described with reference to FIGS.

  In the stop unit shown in FIG. 1, the stop opening 4a is in the maximum stop state. In this state, first, electric power is supplied to the iris motor 5, and the iris motor 5 rotates counterclockwise as indicated by an arrow A (see FIG. 2). Then, the motor shaft 22 rotates in the clockwise direction indicated by the arrow B via the arm 51 of the iris motor 5, whereby the main shaft ring 2 also rotates in the direction indicated by the arrow B. Then, the main shaft 21 similarly rotates in the clockwise direction, and the position of the aperture blade 4 changes. Thereby, the internal diameter of the aperture opening 4a formed by the aperture blade 4 is reduced (see FIG. 2). FIG. 2 shows a state in which the iris motor 5 has finished its operation in this way. As shown in FIG. 2, at this time, the inner diameter of the aperture opening 4a is the same size as the inner diameter of the opening 1a. The state from FIG. 1 to the state of FIG. 2 is the “first drive region” of the present invention.

  Next, electric power is supplied to the stepping motor 6 from the state of FIG. Then, when the stepping motor 6 rotates, rotational power is applied to the ring gear 31 via the motor gear 61, and the cam ring 3 rotates counterclockwise. Then, the driven shaft 32 of the cam ring 3 similarly rotates counterclockwise, and the position of the aperture blade 4 changes. Thereby, the internal diameter of the aperture opening 4a formed by the aperture blade 4 is further reduced. FIG. 3 shows a state in which the stepping motor 6 operates as described above. In FIG. 3, the aperture opening 4a is in the minimum aperture state. The state from FIG. 2 to FIG. 3 is the “second drive region” of the present invention.

  Thus, the diaphragm blade 4 is driven by the iris motor 5 and the stepping motor 6 to change the size of the inner diameter of the diaphragm opening 4a.

<2. Modification of Embodiment 1>
The blade driving device of the present invention is not limited to the diaphragm unit of the above embodiment, and includes various forms that can be considered from the above embodiment. For example, the blade driving device of the present invention may have the following modified configuration or operation.

  The number of aperture blades 4 is not necessarily five, and can be arbitrarily changed according to design conditions. As the number of aperture blades 4 changes, the number of main shafts 21 and driven shafts 32 also changes.

  Further, the first drive region and the second drive region are not necessarily limited to the regions of the embodiment. That is, the area where the iris blade 4 is driven by the iris motor 5 and the area where the iris blade 4 is driven by the stepping motor 6 may be changed.

  For example, the diaphragm blade 4 is driven by both the iris motor 5 and the stepping motor 6 from the state where the diaphragm aperture 4a is the maximum aperture opening to the predetermined aperture state, and the state from the predetermined aperture state to the minimum aperture opening state. Until then, the diaphragm blades 4 may be driven by the stepping motor 6. In this case, a relatively strong driving force can be applied during the initial movement of the diaphragm blade 4, which is effective for high-speed operation of the diaphragm blade 4.

  The diaphragm blade 4 is driven only by the iris motor 5 from the state where the diaphragm aperture 4a is the maximum aperture opening to the predetermined aperture state, and the iris motor 4 is driven from the predetermined aperture state to the minimum aperture opening state. 5 and the stepping motor 6 may be operated to drive the diaphragm blades 4. As described above, the driving region in which the iris blade 4 is driven by the iris motor 5 and the stepping motor 6 can be arbitrarily changed.

  As can be seen from the fact that the iris motor 5 and the stepping motor 6 may be driven simultaneously, the first drive region and the second drive region may overlap at least partially or substantially entirely.

  In another modification, both the iris motor 5 and the stepping motor 6 may apply driving force to either the main shaft ring 2 or the cam ring 3.

  Further, the drive unit is not necessarily a combination of the iris motor 5 and the stepping motor 6, and both may be the iris motor 5 or the stepping motor 6. However, it is desirable that the driving force of each driving unit is applied to each ring by the arm 51 and the motor gear 61 as in the present embodiment.

  In other modified examples, other driving units such as an ultrasonic motor may be used. For example, when the ultrasonic motor and the iris motor 5 are combined, the iris motor 5 operates because the ultrasonic motor is not easily rotated by an external force when not being driven. In some cases, it is preferable to operate the ultrasonic motor at the same time.

  In the embodiment, the aperture unit is described as a specific example. However, the aperture unit is not necessarily required and may be applied as a shutter unit. The “blade driving device” of the present invention includes both an aperture unit and a shutter unit.

<3. Second Embodiment>
Next, Embodiment 2 of the present invention will be described. 10 to 15 are plan views of the aperture unit of the present embodiment. 10, 12 and 14 are plan views of the aperture unit as viewed from one side (front side). 11, 13, and 15 are plan views of the aperture unit as viewed from the other side (back side). In the present embodiment, for convenience of explanation, one side and the front side when the diaphragm unit is viewed in plan are referred to as the back side. FIG. 16 is a cross-sectional view of the aperture unit. Note that the aperture unit of the present embodiment includes the same configuration as that of the first embodiment, and the same configuration as that of the first embodiment is denoted by the same reference numeral, and the description thereof may be omitted.

<Ground plate 1>
The ground plane 1 has six main shafts 11 protruding in the optical axis direction (vertical direction) at equal intervals in the circumferential direction. The position of the main shaft 11 is fixed on the main plate 1.

<Iris motor 5>
The iris motor 5 has substantially the same configuration as that of the first embodiment, but the connected objects are different. As shown in FIGS. 10, 12, 14, and 16, the iris motor 5 has an arm 52 that extends from the main body. Near the end of the arm 52, a pin 53 is formed that protrudes in the direction perpendicular to the direction in which the arm 52 extends (optical axis direction). The pin 53 is connected to the base member 7. When the iris motor 5 rotates, the driving force is transmitted to the base member 7 via the pin 53 and rotates the base member 7. When the base member 7 rotates, the cam ring 9 is rotated from the motor gear 62 of the stepping motor 6 via the ring gear 91.

<Stepping motor 6>
The stepping motor 6 has substantially the same configuration as that of the first embodiment, but is disposed on the base member 7 and has a motor gear 62. The motor gear (gear) 62 meshes with the ring gear 91 of the cam ring 9.

<Base member 7>
The base member 7 shown in FIGS. 10, 12, 14, and 16 is a plate-like member on which the stepping motor 6 is mounted, and is configured to be rotatable. One end of the base member 7 is connected to the pin 53 of the iris motor 5, and when the iris motor 5 operates (rotates), the base member 7 operates (rotates). The base member 7 is supported on the base plate 1 by a base presser 71.

<Aperture blade 8>
The diaphragm blade 8 has the same configuration as that of the diaphragm blade 8 of the first embodiment, and the diaphragm opening 8a, the main shaft hole 81, the driven shaft hole 82, and the diaphragm opening end portion 83 of the diaphragm blade 8 are respectively the diaphragm of the first embodiment. It corresponds to the aperture opening 4 a of the blade 4, the main shaft hole 41, the driven shaft hole 42, and the aperture opening end 43. Although the diaphragm blades 8 of the present embodiment are configured with six sheets, the number of the diaphragm blades 8 can be arbitrarily changed.

  The aperture opening end 83 of the aperture blade 8 forms an aperture opening 8 a together with the aperture opening end 83 of the other aperture blade 8. As shown in FIG. 11, the main shaft 11 is inserted into the main shaft hole 81 of the diaphragm blade 8. A driven shaft 92 is inserted into the driven shaft hole 82 of the aperture blade 8. The diaphragm blade 8 operates in accordance with the operations of the main shaft 11 and the driven shaft 92.

<Cam ring 9>
The cam ring 9 is an annular (ring-shaped) member having a circular outer peripheral surface 9a centering on the optical axis and an inner peripheral surface 9b, and is disposed inside the ground plate 1 in plan view. An outer peripheral surface 9 a of the cam ring 9 faces the peripheral surface 1 b of the main plate 1. The cam ring 9 is rotatably held by the main plate 1. The cam ring 9 has six driven shafts 92 extending in the optical axis direction at equal intervals in the circumferential direction. The cam ring 9 has a ring gear 91 at a position facing the motor gear 62 of the stepping motor 6 on the outer peripheral surface 9a.

  The six driven shafts 92 are respectively inserted into the driven shaft holes 82 of the six diaphragm blades 8 and moved in the region of the driven shaft holes 82. Accordingly, when the cam ring 9 rotates, the driving force is transmitted to the aperture blade 8. More specifically, since the ring gear 91 of the cam ring 9 meshes with the motor gear 62, when the stepping motor 6 rotates, the power is transmitted to the cam ring 9 via the ring gear 91. That is, the cam ring 9 is an intermediate member that transmits the power of the stepping motor 6 to the aperture blade 8.

<Operation of aperture unit>
Next, the operation when changing the aperture state of the aperture 8a will be specifically described with reference to FIGS.

  In the aperture unit of the present embodiment, the state shown in FIG. 1 is a state where the aperture opening 8a is the maximum aperture. In this state, when the inner diameter of the aperture opening 8a is reduced, first, when electric power is supplied to the iris motor 5, the iris motor 5 rotates in the clockwise direction as shown by the arrow in FIG. When the iris motor 5 rotates, the base member 7 rotates in the counterclockwise direction indicated by the arrow in FIG. 12 via the arm 52 of the iris motor 5. When the base member 7 rotates, the motor gear 62 of the stepping motor 6 also rotates in the same manner, whereby the ring gear 91 rotates. When the ring gear 9 rotates, the driven shaft 92 of the cam ring 9 also rotates in the same manner, and the diaphragm blade 8 operates. Since the iris motor 5 operates at a higher speed than the stepping motor 6, the diaphragm blade 8 operates so as to reduce the inner diameter of the diaphragm opening 8a at a relatively high speed. 12 and 13 show a state in which the iris motor 5 has completed its operation.

  Next, in the state of FIG. 12 and FIG. 13, when electric power is applied to the stepping motor 6, the stepping motor 6 rotates, whereby rotational power is applied to the ring gear 91 via the motor gear 62, and the cam ring. 9 rotates counterclockwise (see FIGS. 13 and 15). Then, the driven shaft 92 of the cam ring 9 similarly rotates in the counterclockwise direction, and the diaphragm blade 8 operates. Thereby, the internal diameter of the aperture 8a formed by the aperture blade 8 is further reduced. 14 and 15 show a state in which the stepping motor 6 operates as described above. 14 and 15, the aperture 4a is in the minimum aperture state.

  In this way, the diaphragm blade 8 is driven by the iris motor 5 and the stepping motor 6 to change the size of the inner diameter of the diaphragm opening 8a.

  The iris motor 5 and the stepping motor 6 may have a period during which they operate simultaneously. When the iris motor 5 and the stepping motor 6 are operated simultaneously, the aperture blade 8 can be operated at a higher speed than when the iris motor 5 is operated alone.

  The modification described in the first embodiment can be similarly applied to the present embodiment as long as there is no contradiction.

<4. Features of the present invention>
The present invention is a blade driving device including the aperture unit described in the embodiment and the modification as described above.

  In the blade driving device of the present invention, the diaphragm blades 4 or 8 are driven by the iris motor 5 and the stepping motor 6, and the iris motor 5 and the stepping motor 6 drive the diaphragm blades 4 or 8 without interfering with each other. Is possible. That is, only one of the iris motor 5 and the stepping motor 6 may operate independently, or may operate simultaneously, and independent control is possible. Accordingly, the driving force of the diaphragm blades 4 or 8 can be changed according to the driving region, and the diaphragm blades 4 or 8 can be driven at a high speed in a driving region where high speed operation is required. . That is, for example, the aperture blade 4 or 8 can be driven at a high speed in the initial stage of the operation, and thereafter driven at a low speed.

  In the blade driving device of the present invention, the diaphragm blade 4 or 8 is driven by the iris motor 5 and the stepping motor 6, the first drive region in which the iris blade 4 or 8 is driven by the iris motor 5, And a second drive region in which 4 or 8 is driven. As a result, the driving force of the diaphragm blades 4 or 8 can be changed according to the drive region, and the diaphragm blades 4 or 8 are driven at high speed in a drive region where high speed operation is required (for example, the first drive region). It is possible to do.

  In the blade driving device of the present invention, the iris motor 5 operates at a higher speed than the stepping motor 6, and the iris motor is operated from the state in which the diaphragm opening 4a or 8a is the maximum diaphragm opening to the opening state similar to the opening 1a. The aperture blade 4 or 8 is driven by 5. Thereby, it becomes possible to drive the aperture blade 4 or 8 at a high speed in a necessary region. If the region where the diaphragm blades 4 or 8 are to be driven at a high speed is another region, the iris blades 4 or 8 are driven by the iris motor 5 or the combination of the iris motor 5 and the stepping motor 6 according to the region. It is preferable to do. In particular, it is preferable to operate the iris motor 5 and the stepping motor 6 simultaneously because the diaphragm blades 4 or 8 can be driven at a higher speed.

  In addition, since the blade driving device according to the first embodiment of the present invention includes the main shaft ring 2 and the cam ring 3 as separate members, the power from the iris motor 5 and the power from the stepping motor 6 are interfered with each other. And can be transmitted to the diaphragm blades 4. Similarly, in the blade driving device of the second embodiment, since the stepping motor 6 is mounted on the base member 7 and the iris motor 5 drives the base member 7, the power from the iris motor 5 and the power from the stepping motor 6 are the same. Can be transmitted to the diaphragm blades 8 without any operation interference.

  In the blade driving device of the present invention, a driving force is applied to the ring by the arm 51 (or 52) and the motor gear 61 (or 62). Therefore, for example, backlash and other backlash can be reduced as compared with the case where the driving force is applied using two gears. That is, the blade driving device of the present invention can adjust the aperture amount with high accuracy compared to the case where the driving force is applied using two motor gears.

  In the focal plane shutter according to the second embodiment of the present invention, the stepping motor 6 is mounted on the base member 7 and the iris motor 5 drives the base member 7. Accordingly, the stepping motor 6 directly drives the diaphragm blade 8, and the iris motor 5 is configured to indirectly drive the diaphragm blade 8 via the motor gear 62 of the stepping motor 6. Thereby, the iris motor 5 and the stepping motor 6 can be operated at an arbitrary timing, and the driving speed of the aperture blade 8 can be arbitrarily adjusted.

  In the focal plane shutter of the present invention, since the iris motor 5 drives the diaphragm blades 4 or 8 at a higher speed than the stepping motor 6, the drive speed of the diaphragm blades 4 or 8 is increased or decreased at an arbitrary timing. Can be adjusted.

  Further, since the blade driving device of the present invention uses an electromagnetic actuator as the iris motor 5, the iris motor 5 can operate at a higher speed than the stepping motor 6. Therefore, it is possible to drive the diaphragm blades 4 or 8 at a high speed in a necessary region.

  The blade driving device including the aperture unit of the present invention is used as an imaging device such as a camera or a drone-mounted camera including a photoelectric conversion element such as a CCD or C-MOS sensor that functions as an imaging element. It is also used for an interchangeable lens diaphragm. Moreover, it is used also as electronic devices, such as a smart phone which has an imaging function, a tablet apparatus, and PC. Moreover, it can replace with an image pick-up element and is applicable also to imaging devices, such as a camera which uses a film as an image pick-up part.

<5. Other>
The present invention is not limited to the embodiments and the modifications, and is broadly interpreted to the extent that a person skilled in the art can grasp.

  The present invention is suitably used as an aperture unit of an imaging apparatus.

DESCRIPTION OF SYMBOLS 1 ... Ground plane 1a ... Opening part 1b ... Circumferential surface 11 ... Main shaft 2 ... Main shaft ring 2a ... Outer peripheral surface 2b ... Inner peripheral surface 21 ... Main shaft 22 ... Motor shaft 3 ... Cam ring 3a ... Outer peripheral surface 3b ... Inner peripheral surface 31 ... Ring gear 32 ... driven shaft 4 ... aperture blade 4a ... aperture opening 41 ... main shaft hole 42 ... driven shaft hole 43 ... aperture opening end 5 ... iris motor 51, 52 ... arm 53 ... pin 6 ... stepping motor 61, 62 ... motor gear 7 ... Base member 71 ... Base presser 8 ... Blade 8a ... Opening 81 ... Main shaft hole 82 ... Drive shaft hole 83 ... Diaphragm opening end 9 ... Cam ring 9a ... Outer peripheral surface 9b ... Inner peripheral surface 91 ... Ring gear 92 ... Drive shaft

Claims (10)

A main plate having a first opening;
A blade that shields at least a part of the first opening and forms a second opening that can be changed in size;
A first drive unit for driving the blade;
A second drive unit for driving the blades,
The first drive unit and the second drive unit can drive the blades without interfering with each other.
Blade drive device. The first drive unit has a first drive region for driving the blades, and the second drive unit has a second drive region for driving the blades,
The blade driving device according to claim 1. The first drive unit can drive the blades at a higher speed than the second drive unit,
The first drive region is a region from the widest opening state to the predetermined opening state of the second opening.
The blade driving device according to claim 2. A first member for applying a driving force from the first driving unit to the blade;
A second member for applying a driving force from the second driving unit to the blades.
The blade drive device according to any one of claims 1 to 3. The first driving unit includes an arm that gives the driving force to the first member;
The second drive unit includes a gear that gives its second driving force to the second member.
The blade drive device according to claim 4. The second drive unit is mounted on a base member configured to be rotatable, and is coupled to the blades.
The first driving unit is coupled to the base member.
The blade driving device according to claim 1. The first drive unit can drive the blades at a higher speed than the second drive unit.
The blade driving device according to claim 6. The first drive unit is an electromagnetic actuator;
The second driving unit is a motor;
The blade drive device according to any one of claims 1 to 7.   An imaging device comprising the blade driving device according to any one of claims 1 to 8.   An optical apparatus comprising the blade driving device according to any one of claims 1 to 8.

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