JP2018155823A - Diaphragm device, lens device having the same, and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm device capable of switching an opening shape between a circle and an ellipse by one lens and, at the same time, aperture size can also be continuously varied, and to provide a lens device and an imaging apparatus having the diaphragm device.SOLUTION: A diaphragm device for changing an opening amount of a lens device includes: a first diaphragm part for defining an opening amount of the minimum opening of the diaphragm device; and a second diaphragm part for continuously varying a shape between a circle shape and an ellipse shape as an opening shape when the diaphragm device is in an opening state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a diaphragm device used in a photographic lens device, and more particularly to a diaphragm device in which an aperture shape of the diaphragm device is switched, a lens device having the diaphragm device, and an imaging device.

  Conventionally, a plurality of diaphragm blades equipped with a rotation shaft are arranged at equal angular intervals on the same circumference, and the diaphragm opening formed by overlapping the inner edges of the diaphragm blades is changed by rotation around the rotation shaft of the diaphragm blades A diaphragm device is known.

  The aperture opening shape affects the blurring around the main subject in the captured image, and generally a beautiful blurred image can be obtained. Therefore, an aperture shape close to a circle is required. On the other hand, a unique elliptical blur image of an anamorphic lens is also required.

  Here, when a photographer uses one photographing device and switches between a circular shape and an elliptical shape depending on a blurred image desired at the time of photographing, for example, a plurality of aperture shapes are selected as shown in Patent Document 1. A structure has been proposed.

Japanese Patent Laid-Open No. 04-269727

  According to Patent Document 1, the structure for switching the aperture shape constitutes a diaphragm aperture having a plurality of aperture shapes as dedicated shapes, which hinders downsizing of the photographing apparatus. Further, when the aperture shape is switched during moving image shooting, there is a problem that the aperture shape cannot be continuously switched because the light is temporarily shielded at the time of switching.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a diaphragm device capable of switching the aperture shape between a circular shape and an elliptical shape without passing through a light-shielding state with a single lens, and at the same time, the aperture size can be continuously varied, and a lens device having the aperture device and photographing. Is to provide a device.

  In order to achieve the above object, an aperture device for changing the aperture amount of the lens device according to the present invention includes a first aperture portion that defines an aperture amount of the minimum aperture of the aperture device, and an aperture when the aperture device is opened. And a second aperture part that continuously changes the shape between a circular shape and an elliptical shape.

  According to the present invention, a diaphragm device that can arbitrarily switch between a circular shape and an elliptical shape according to the blur effect that the photographer wants to obtain at the time of photographing, and at the same time, can continuously change the respective opening sizes of the circular shape and the elliptical shape. Can be provided.

It is a side view of the diaphragm | throttle device which concerns on Example 1 of this invention. It is a fragmentary sectional view of the diaphragm | throttle device which concerns on Example 1 of this invention. It is a partial exploded perspective view of the diaphragm | throttle device which concerns on Example 1 of this invention. It is the front view and side view of a diaphragm | throttle device which concern on Example 1 of this invention. It is the front view and side view of a diaphragm | throttle device which concern on Example 1 of this invention. It is the front view and side view of a diaphragm | throttle device which concern on Example 1 of this invention. It is the front view and side view of a diaphragm | throttle device which concern on Example 1 of this invention. It is a whole perspective view of the aperture_diaphragm | restriction apparatus which concerns on Example 2 of this invention. It is a partial exploded perspective view of the diaphragm | throttle device which concerns on Example 2 of this invention. It is the front view and side view of a diaphragm | throttle device which concern on Example 2 of this invention. It is the front view and side view of a diaphragm | throttle device which concern on Example 2 of this invention. It is the front view and side view of a diaphragm | throttle device which concern on Example 2 of this invention. It is the front view and side view of a diaphragm | throttle device which concern on Example 2 of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Hereinafter, a diaphragm device according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 shows an overall view of a diaphragm device in this embodiment. The aperture device of the present invention includes a first aperture unit 1a and a second aperture unit 2a, and determines the aperture diameter of a lens group such as a focus, zoom, and relay unit of a lens device (not shown) in which the aperture device is incorporated, The aperture opening shape can be continuously changed. In particular, the first diaphragm 1a is a diaphragm that defines the opening amount of the minimum opening. Both the first aperture portion 1a and the second aperture portion 2a can be manually operated, and aperture operation rings 11a and 21a having outer diameter gears connected to a motor and a rotation operation member are configured. The aperture operation rings 11a and 21a slide and rotate on the outer diameter of a fixed cylinder 105 connected to a lens group (not shown) in the front and rear directions, and rotate in the direction of the rotation axis by an operation ring presser 6 connected to the fixed cylinder 105 with a fixed screw 602. Movement is regulated. An aperture operation ring display unit 111 indicating brightness is displayed on the aperture operation ring 11a. The photographer only has to rotate the aperture operation ring 11a to reduce the numerical value of the aperture operation ring display unit 111 so that the desired brightness is obtained, and to match the index line 601 engraved on the operation ring presser 6 by printing or engraving. .

  FIG. 2 shows a partial cross-sectional view of the first throttle part 1a of FIG. A connecting shaft 107 is fixed to the aperture operation ring 11 a, and the tip of the connecting shaft 107 is fitted into a connecting hole 114 provided integrally with the cam member 103. The cam member 103 is held in a state in which the inner diameter of the aperture blade housing portion 102 is slidable. When the aperture operation ring 11a is rotated, the rotational force is transmitted to the cam member 103 by the connecting shaft 107 and rotates. Here, the aperture blade housing portion 102 is fixed to the fixed cylinder 105 by the aperture unit fixing member 603 in a state where the rotation around the central axis 5 is restricted by a rotation stop pin (not shown) or the like. A screw is formed on the outer diameter of the diaphragm unit fixing member 603, and is fixed to the inner diameter screw portion of the fixed cylinder 105 by screw connection.

  FIG. 3 is a partially exploded perspective view showing the diaphragm blade housing portion 102 shown in FIG. 2 and its internal structure. The cam members 103 and 203 slide and rotate along the inner diameter portion of the diaphragm blade housing portion 102, and movement in the direction of the central axis 5 is restricted by the cam pressing members 104 and 204. The cam holding members 104 and 204 have a C-ring shape, and are inserted into the inner diameter of the diaphragm blade housing portion 102 so as to narrow the opening of the C-ring portion, and the deformation is released to the original shape. By returning it, it is fixed to the diaphragm blade housing 102. The plurality of diaphragm blades 3a and 4a housed in the diaphragm blade housing portion 102 are configured with drive pins 302 and 402 that engage with the cam grooves 113 and 213 of the cam members 103 and 203, respectively. Further, the rotation center pins 301 and 401 inserted into the pin holes 112 opened in the aperture blade storage portion 102 are also integrally formed.

  When the aperture operation rings 11a and 21a are operated and the cam members 103 and 203 are rotated, the aperture blades 3a and 4a are centered on the rotation center pins 301 and 401, and the drive pins 302 and 402 are along the cam grooves 113 and 213. Rotate. Thereby, the opening shape comprised by the internal diameter of several aperture blade 3a, 4a changes.

  FIG. 4 shows a front view (a) when both the first diaphragm portion 1a and the second diaphragm portion 2a in FIG. 1 are opened, and positions (b) of the diaphragm operation rings 11a and 21a at that time. Is. In this specification, the state of opening (maximum opening) refers to the maximum state in design, or the maximum in specification (including other than mechanical maximum).

  When the aperture operation rings 11a and 21a are located at the positions shown here, the aperture shape of the aperture is determined by the inner diameter shape of the aperture blade 3a. When it is desired to drive the small-diameter side with a circular opening shape, the circular opening size can be continuously varied by rotating only the aperture operation ring 11a. Although the shape of the opening is described as “circular”, the shape of the opening is not a strict circle because it is an opening formed by overlapping a plurality of diaphragm blades. In the specification, it is described as “circular” or “circular shape”.

  Next, the photographer rotates the aperture operation ring 21a to the position shown in FIG. 5B, for example.

  At this time, as shown in the front view (a) of FIG. 5, the shape of the aperture opening is an elliptical shape formed by the inner diameters of the plurality of aperture blades 4a, and an elliptical blur image as taken with an anamorphic lens is obtained. Is shown. When the aperture operation ring display section 211 shows a value of “A1” and further rotates to the “A2” position in the same direction (FIG. 6B), the aperture blade 4a has a cam groove 213 as shown in FIG. 6A. The opening state formed by the diaphragm blades 4a changes along the trajectory toward the small diameter side. Although the shape of the opening formed by the inner diameters of the plurality of diaphragm blades 4a is described as “elliptical”, since the opening is formed by the overlap of the plurality of diaphragm blades, the shape of the opening is strict. It is not an ellipse. However, since it is substantially elliptical, it is described as “elliptical” or “elliptical shape” in this specification.

  When the diaphragm operating ring 21a is rotated and the diaphragm blade 4a is driven to the smaller diameter side, the opening shape formed by the inner diameter of the diaphragm blade 4a initially forms an elliptical shape as shown in FIG. To do. However, as it is driven in the same direction, as shown in FIG. 6 (a), the shape of the ellipse becomes conspicuous in the vertical direction like a cat eye, and the elliptical shape is gradually displaced. In this case, as shown in FIG. 7B, the aperture operation ring 11a is rotated to drive the aperture blade 3a to the smaller diameter side, and a portion where the sharpness of the opening formed by the inner diameter of the aperture blade 4a is conspicuous. Hide (FIG. 7A). In other words, the elliptical opening shape formed by narrowing down the diaphragm blades 4a has a conspicuous opening sharpness on both side portions in the major axis direction (vertical end of the opening shown in FIG. 6A). This makes it possible to form an elliptical opening by correcting the shape so that the corner of the corner formed in the opening is closer to 180 degrees. That is, the aperture shape when the aperture is opened may be a shape formed by the aperture blades of the first aperture section 1a and the aperture blades of the second aperture section 2a working together.

  As described above, according to the present invention, the aperture shape of the aperture can be selected from a circle and an ellipse simply by operating the aperture operation rings 11a and 21a. In addition, the photographer can continuously change the aperture size to an arbitrary size by simply operating the aperture operation rings 11a and 21a.

  Hereinafter, a method for forming an elliptical opening according to the second embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 shows an overall view of the imaging apparatus in the present embodiment. The diaphragm device according to the second embodiment includes a first diaphragm section and a second diaphragm section 2b. The second diaphragm portion 2b overlaps the second diaphragm portion 2a of the first embodiment, and the two diaphragm blades 504a and 504b are formed by both edges so as to overlap each other, and the two diaphragm blades It is an apparatus provided with a drive mechanism that changes the aperture size by relatively driving 504a and 504b.

  FIG. 9 is a partially exploded perspective view showing the diaphragm blade storage portion 102 shown in FIG. 8 and its internal structure. The second diaphragm portion 2b includes diaphragm blades 504a and 504b that are provided between the diaphragm base 502 and the diaphragm cover 505 and that traverse in a linear direction, and a drive system. A drive lever 522 is attached to a drive shaft of a galvanometer 512 attached to the diaphragm base 502, and the tip of the drive lever 522 is coupled to the cam grooves 514 and 524 of the diaphragm blades 504a and 504b to drive the diaphragm blades.

  The diaphragm cover 505 has a linear motion guide 515 for driving the diaphragm blades 504a and 504b in the straight direction, and the diaphragm blades driven by the galvanometer 512 are linearly driven.

  FIG. 10 shows a front view (a) when both the first diaphragm portion 1a and the second diaphragm portion 2b of FIG. 8 are opened, the position (b) of the diaphragm operation ring 11a at that time, and the diaphragm operation switch 21b. The position (c) is shown.

  When the aperture operation ring 11a and the aperture operation switch 21b are located at the positions shown in FIG. 10, the aperture shape of the aperture is determined by the inner diameter shape of the aperture blade 3a. When it is desired to drive the small-diameter side with a circular opening shape, the circular opening size can be continuously varied by rotating only the aperture operation ring 11a.

Next, the photographer operates the aperture operation switch 21b to the position shown in FIG. 11B, for example.
At this time, as shown in the front view (a) of FIG. 11, the aperture opening shape is an elliptical shape formed by the inner diameters of the two opposing diaphragm blades 504a and 504b. It shows that an image is obtained.

  Further, the aperture operation switch 21b is operated to the position shown in FIG. In the state shown in FIG. 11, the opening formed by the inner diameters of the two opposing diaphragm blades 504a and 504b has an elliptical shape. However, when the diaphragm blades are driven to the position shown in FIG. 12 (b), the shape of the ellipse becomes conspicuous in the vertical direction like a cat, and the ellipse shape is gradually broken.

  In that case, by rotating the diaphragm operating ring 11a as shown in FIG. 13B, the diaphragm blade 3a is driven to the small diameter side to hide the portion where the sharpness of the opening formed by the inner diameter of the diaphragm blades 504a and 504b is conspicuous. It is possible to correct the elliptical shape and form an elliptical opening.

  As described above, according to the present invention, the aperture shape of the aperture can be selected from a circle and an ellipse simply by operating the aperture operation ring 11a and the aperture operation switch 21b. In addition, the photographer can continuously change the circular and oval shapes to any desired opening size simply by operating the aperture operation ring 11a and the aperture operation switch 21b.

  In the second embodiment, the aperture size switch is limited to the operation of the second diaphragm portion 2b by using the diaphragm operation switch 21b. However, the diaphragm operation used in the first embodiment is used instead of the diaphragm operation switch 21b. You may make it the structure which can change an opening size continuously with the ring 21a.

  By configuring the lens device having the diaphragm device of the present invention, it is possible to realize a lens device that enjoys the effect of the diaphragm device of the present invention. In addition, by configuring an imaging apparatus including a lens apparatus having the diaphragm apparatus of the present invention and an imaging element that receives an optical image formed by the lens apparatus, an imaging apparatus that can enjoy the effects of the present invention can be realized. it can.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1a: A diaphragm device (first diaphragm unit)
2a, 2b: Aperture device (second aperture part)
3a, 4a, 504a, 504b: diaphragm blades

Claims (7)

An aperture device that changes the aperture of the lens device,
A first diaphragm portion that defines an opening amount of a minimum opening of the diaphragm device;
A second aperture portion that continuously changes the shape of the aperture when the aperture device is opened between a circular shape and an elliptical shape;
A diaphragm device characterized by comprising:   2. The diaphragm device according to claim 1, wherein each of the first diaphragm section and the second diaphragm section has a configuration in which an opening is changed by driving a plurality of diaphragm blades with a cam member.   The lens device according to claim 1, wherein the second aperture section includes two aperture blades, and the aperture shape at the time of opening is changed by driving the two aperture blades.   The aperture device according to claim 1, wherein the aperture shape of the aperture device is formed by the aperture blades of the first aperture section and the aperture blades of the second aperture section working together.   The aperture shape of the diaphragm device is characterized in that both sides of the elliptical shape formed by the diaphragm blades of the second diaphragm portion are constituted by the diaphragm blades of the first diaphragm portion. The diaphragm apparatus according to claim 4.   A lens device comprising the diaphragm device according to claim 1.   An imaging apparatus comprising: the lens apparatus according to claim 6; and an imaging element that receives an optical image formed by the lens apparatus.

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