JP6759549B2 - Lens barrel, camera body and program - Google Patents

Description

The present invention relates to a lens barrel, a camera body and a program.

Conventionally, there is a lens barrel provided with a main aperture capable of narrowing down to a small aperture and an aperture device provided with an auxiliary aperture that determines an open aperture at each focal length in conjunction with a zoom operation (see Patent Document 1).
In such a diaphragm device, the main diaphragm blades are driven from a position forming a drive start diameter to a set small diaphragm position.

Japanese Unexamined Patent Publication No. 2001-83565

However, in the above-mentioned conventional technique, the drive start diameter of the main diaphragm is constant. Then, the main aperture is driven from the drive start diameter to the small aperture position every time a picture is taken. For this reason, for example, in the case of high-speed continuous shooting, there is a problem that the high-speed continuous shooting speed is limited by the main aperture drive time.

An object of the present invention is to provide a lens barrel, a camera body, and a program capable of shortening the aperture driving time.

The present invention solves the above problems by the following solutions.
In one embodiment of the present invention, an aperture value information acquisition unit that acquires aperture value information from a mounted camera body, an open diameter forming member that defines an aperture open diameter, and an outer diameter side of the aperture open diameter The diaphragm member driven from the diaphragm drive start position to the diaphragm position on the inner diameter side of the diaphragm opening diameter to achieve the diaphragm value acquired from the diaphragm value information acquisition unit, and the diaphragm member are driven to start the diaphragm drive. A diaphragm drive unit that drives from a position to the diaphragm position is provided, and the diaphragm drive start position is within a range on the outer diameter side of the diaphragm opening diameter in response to a change in the diaphragm opening diameter. The lens barrel is characterized in that it is changed so as to shorten the driving time from the driving start position to the aperture position.
In another embodiment of the present invention, an aperture value information acquisition unit that acquires aperture value information from the mounted camera body, an open diameter forming member that defines the aperture open diameter, and an outer diameter side of the aperture open diameter side. The diaphragm member is driven from the diaphragm drive start position of No. 1 to the diaphragm position on the inner diameter side of the diaphragm opening diameter to achieve the diaphragm value acquired from the diaphragm value information acquisition unit, and the diaphragm member is driven by the diaphragm. With respect to a lens barrel including a diaphragm drive unit that drives from a start position to the diaphragm position, the diaphragm drive start position is set to an outer diameter side of the diaphragm open diameter according to a change in the diaphragm open diameter. The camera body is characterized in that it is instructed to change the driving time from the diaphragm driving start position to the diaphragm driving position within the range of.
In another embodiment of the present invention, an aperture value information acquisition unit that acquires aperture value information from the mounted camera body, an open diameter forming member that defines the aperture open diameter, and an outer diameter side of the aperture open diameter side. The diaphragm member is driven from the diaphragm drive start position of No. 1 to the diaphragm position on the inner diameter side of the diaphragm opening diameter to achieve the diaphragm value acquired from the diaphragm value information acquisition unit, and the diaphragm member is driven by the diaphragm. With respect to a lens barrel including a diaphragm drive unit that drives from a start position to the diaphragm position, the diaphragm drive start position is set to an outer diameter side of the diaphragm open diameter according to a change in the diaphragm open diameter. This is a program for causing the control unit of the camera body to execute a step instructing the control unit of the camera body to change the drive time from the diaphragm drive start position to the diaphragm drive position within the range of.

It is the schematic of the lens barrel provided with the diaphragm apparatus of one Embodiment of this invention, and the camera body to which the lens barrel is attached. It is a partially enlarged view of the lens barrel in the state of a telephoto end. It is a graph explaining the driving of the aperture unit in the case of the continuous shooting speed of 5 frames / sec. It is a graph explaining the driving of the aperture unit in the case of the continuous shooting speed of 10 frames / sec. It is a partial cross-sectional view of a lens barrel, and shows the open positional relationship between the main diaphragm blade and the sub diaphragm blade at Tm2 at 5 frames / sec. It is a partial cross-sectional view of a lens barrel, and shows the open positional relationship between the main diaphragm blade and the sub diaphragm blade at Tm2 at 10 frames / sec.

Hereinafter, embodiments of the present invention will be described with reference to the drawings and the like.
FIG. 1 is a schematic view of a lens barrel 200 including an aperture device 100 according to an embodiment of the present invention and a camera body 300 to which the lens barrel 200 can be attached and detached.

(Camera body)
The camera body 300 includes an imaging unit 302 that converts an optical image of a subject into an electric signal, a camera control unit 304 that controls the entire camera body 300, and a release switch 305 that starts shooting.
The camera body 300 is capable of continuous shooting and includes a setting unit 303 that can select the continuous shooting speed. In the present embodiment, the photographer can select, for example, continuous shooting at 5 frames / second or continuous shooting at 10 frames / second from the setting unit 303.
In addition, the setting unit 303 can also set the aperture value at the time of shooting, and the photographer can select an arbitrary aperture value via the setting unit 303.

(Lens barrel)
The lens barrel 200 includes a photographing lens (only the zoom lens 201 is shown), an aperture device 100 for adjusting the aperture diameter of the lens barrel 200, an encoder 202 for measuring the focal length of the lens barrel 200, and each focal length. It is provided with a memory 203 having aperture diameter control data and a lens control unit 204 for controlling the entire lens barrel 200, and is removable from the camera body 300.

FIG. 2 is a partially enlarged view of the lens barrel 200 at the telephoto end. As shown in the figure, the lens barrel 200 includes an outer fixed ring 210, a zoom operating ring 211, an interlocking member 212, a cam ring 213, and an inner fixed ring 214, in addition to the above-mentioned members.

The outer fixed ring 210 is a tubular body that serves as a reference for supporting the photographing lens and the overall structure.
A zoom operation ring 211 is rotatably arranged on the outer fixed ring 210 about the optical axis OA.
The zoom operation ring 211 is rotated by the photographer during the scaling operation (zooming). A non-slip rubber layer 211a is provided on the outer peripheral surface of the zoom operation ring 211.
One end of the interlocking member 212 is fixed to the zoom operation ring 211.

The other end of the interlocking member 212 is connected to a cam ring 213 arranged on the inner diameter side of the zoom operation ring 211.
When the zoom operation ring 211 rotates, the rotation is transmitted by the interlocking member 212, and the cam ring 213 also rotates together.
The cam ring 213 is provided with a cam groove 213a to which the cam roller 216, which will be described later, is engaged.

An inner fixed ring 214 is arranged inside the cam ring 213.
The inner fixed ring 214 is provided with a straight groove 214a and an auxiliary throttle cam groove 214b.
The straight groove 214a regulates the rotation of the zoom lens 201. The sub-throttle cam groove 214b engages with a protrusion 121a provided on the sub-throttle side rotating member 121, which will be described later, in order to change the opening diameter of the sub-throttle blade 122 by a predetermined amount.

A zoom lens 201, a lens holding frame 217 for holding the zoom lens 201, and an aperture device 100 are arranged on the inner diameter side of the inner fixed ring 214.

The lens holding frame 217 and the diaphragm device 100 are connected by a connecting member 218.
The cam roller 216 described above is attached to the outer periphery of the connecting member 218. The cam roller 216 engages with the cam groove 213a and the straight groove 214a.

(Aperture device)
The aperture device 100 is a unitized main aperture mechanism 110 that variably sets the aperture diameter within the open aperture diameter and a sub-aperture mechanism 120 that variably sets the open aperture diameter.

(Main aperture mechanism)
The main diaphragm mechanism 110 is driven by a stepping motor 130, and includes a PI 131 for detecting a reference position of the main diaphragm blades 112 and seven main diaphragm blades 112 in which two dowels are integrated.
Further, the main diaphragm mechanism 110 includes seven holes for engaging one of the dowels, and includes a main diaphragm side rotating member 111 that rotates about the optical axis OA.
Further, the main diaphragm mechanism 110 has seven cam grooves 213a with which the other dowel is engaged, and includes a fixing member 123 fixed to the lens barrel 200.

The main diaphragm blade 112 is formed of a thin plate-shaped member, has a substantially straight line on one side, and has a substantially triangular shape curved in the circumferential direction.
The stepping motor 130 is fixed to the fixing member 123 via the pressing plate 114.
Further, the output gear of the stepping motor 130 is coupled to the main throttle side rotating member 111. The main diaphragm blade 112 opens and closes when the main diaphragm side rotating member 111 is rotationally driven by using the stepping motor 130 as a drive source, and is predetermined within the range equal to or less than the open diaphragm diameter (secondary diaphragm diameter) formed by the secondary diaphragm blade 122. The aperture diameter (main aperture diameter) of is formed.

Similarly, a photo interrupter (hereinafter referred to as PI) 131 is attached to the holding plate 114, while the light-shielding plate 111a extending from the main diaphragm side rotating member 111 passes between the detection portions of the PI 131, whereby the main The reference position of the diaphragm blade 112 is detected.
The stepping motor 130 and PI 131 are connected to an FPC (not shown), and signals and power are supplied from the outside.

The encoder 202 detects the focal length of the position of the zoom lens 201. The focal length information of the lens barrel 200 measured by the encoder 202 is transmitted to the lens control unit 204.
The memory 203 has aperture diameter control data of the main aperture blade 112 for each focal length for focal length information.
The lens control unit 204 collates the focal length information with the aperture diameter control data stored in the memory 203.
Then, the lens control unit 204 is automatically set by the aperture value set by the photographer or the camera control unit 304 based on the aperture diameter control data of the main aperture blades corresponding to the focal length of the lens barrel 200. The main diaphragm blade 112 is driven via the stepping motor 130 according to the diaphragm value.

(Secondary aperture mechanism)
The sub-aperture mechanism 120 works with the zoom operation ring 211 to form an open diameter according to the focal length.
The sub-throttle mechanism 120 includes seven sub-throttle blades 122 in which two dowels are integrated, and a fixing member 123 having seven holes with which one dowel engages. Further, the sub-throttle mechanism 120 includes a sub-throttle side rotating member 121 having seven cam grooves 213a with which the other dowel is engaged and having a protrusion 121a on the outer peripheral portion rotating around the center of the optical axis OA. The fixing member 123 is common to the main diaphragm mechanism 110.

When the zoom operation ring 211 is rotated from the telephoto side to the wide side, the interlocking member 212 rotates.
Then, the cam ring 213 engaged with the interlocking member 212 rotates, and the connecting member 218 to which the cam groove 213a of the cam ring 213 and the cam roller 216 engaged with the straight groove 214a of the inner fixing ring 214 are fixed. Moves straight.
Since the protrusion 121a of the sub-throttle side rotating member 121 of the sub-throttle mechanism 120 that moves integrally with the connecting member 218 is engaged with the straight groove 214a of the inner fixing ring 214, the sub-throttle mechanism 120 moves straight. The sub-throttle side rotating member 121 is rotated to change the opening diameter to the smaller one.

(Lens control unit)
When continuous shooting is set via the setting unit 303 of the camera body 300, the lens control unit 204 receives the set frame speed information of continuous shooting via the camera control unit 304.
Further, the lens control unit 204 receives the focal length information of the zoom lens 201 driven by the rotation of the zoom operation ring 211 from the encoder 202.

The lens control unit 204 reads out the aperture diameter control data corresponding to the received frame speed information from the memory 203, and drives the main aperture blade 112 of the aperture device 100 by the stepping motor 130 according to the frame speed and the focal length. Control.

(Control of aperture device)
Next, the control of the diaphragm device 100 (electromagnetic diaphragm) of the present embodiment will be described.
FIG. 3 is a graph illustrating the driving of the aperture device 100 when the continuous shooting speed is 5 frames / sec. FIG. 4 is a graph illustrating the driving of the aperture device 100 when the continuous shooting speed is 10 frames / sec.

In FIGS. 3 and 4, the horizontal axis indicates the focal length of the lens barrel 200. ft is the case where the focal length is the tele end, fw is the case where the focal length is the wide end, and fm1 to fm3 between them are cases where the focal length is between the tele end and the wide end. From the tele side, the order is fm1, fm2, fm3. The vertical axis indicates the size of the diameter of the main diaphragm mechanism 110 and the sub diaphragm mechanism 120.

1) Secondary aperture diameter (open diameter)
The alternate long and short dash line AL in FIGS. 3 and 4 indicates the diameter of the secondary diaphragm formed by the secondary diaphragm blade 122 at each focal length.
φst is the sub-aperture diameter when the focal length is at the telephoto end.
φsm1 to φsm3 are sub-aperture diameters when the focal length is between the telephoto end and the wide end, and are φsm1, φsm2, and φsm3 from the telephoto side.
φsw is the sub-aperture diameter when the focal length is at the wide end.

2) Minimum diaphragm diameter of the main diaphragm The alternate long and short dash line in FIGS. 3 and 4 indicates the minimum diaphragm diameter formed by the main diaphragm blade 112 at each focal length.
φets is the minimum aperture diameter formed by the main aperture blade 112 when the focal length is at the telephoto end.
φem1s to φems3 are the minimum aperture diameters formed by the main aperture blade 112 when the focal length is middle between the telephoto end and the wide end.
φnews is the main minimum diaphragm diameter formed by the main diaphragm blades 112 when the focal length is at the wide end.

3) Main diaphragm drive start diameter The solid line EAL indicates the drive line of the drive start diameter of the main diaphragm blade 112. The drive start diameter is larger than the diameter formed by the auxiliary diaphragm blades 122 that form the open diameter of the diaphragm itself. The main diaphragm blade 112 starts driving from this drive start diameter every time the image is taken, passes through the diameter formed by the sub diaphragm blade 122, and is driven to the set diaphragm diameter.

In the case of 5 frames / sec in FIG. 3, the drive start diameter of the main diaphragm blade 112 is constant at φetw regardless of whether the lens barrel 200 is at the tele end or the wide end.
On the other hand, in the case of 10 frames / sec in FIG. 4, the drive start diameter of the main diaphragm blade 112 is φetw as in the case of 5 frames when the lens barrel 200 is at the telephoto end.
However, when the focal length of the lens barrel 200 moves to the wide end and reaches a predetermined position (the position of the focal length fmc in the figure), the drive start diameter of the main diaphragm blade 112 begins to decrease.
In the present embodiment, the focal length decreases linearly from φetw to φetw'from fmc to fw (wide end).

4) Aperture time Here, the main aperture blade 112 changes from the drive start diameter shown by the solid line to the set aperture diameter each time a picture is taken. The maximum narrowing time required for driving at that time is indicated by T in the figure.

At the continuous shooting speed of 5 frames / sec shown in FIG. 3, Tt is the aperture time to the minimum aperture when the lens barrel 200 is at the telephoto end. The states of the secondary diaphragm blade 122 and the main diaphragm blade 112 in the open state at this time are shown in FIG. 2 (states of the main diaphragm blade 112 (A) and the secondary diaphragm blade 122 (A)).

When the continuous shooting speed is 5 frames / sec shown in FIG. 3, Tw is the aperture time when the lens is at the wide end, and Tm1 to Tm3 are the aperture times when the lens is between the telephoto end and the middle end. , Tm1, Tm2, Tm3 from the telephoto side.
The open positional relationship between the main diaphragm blade 112 and the sub diaphragm blade 122 at Tm2 is the state of the main diaphragm blade 112 (B) and the sub diaphragm blade 122 (B) shown in FIG.
Further, FIG. 5 is a partial cross-sectional view of the lens barrel similar to that of FIG. 2, but the main diaphragm blade 112 (B) is the open positional relationship between the main diaphragm blade 112 and the sub diaphragm blade 122 at the time of Tm2 in 5 frames. ) And the state of the auxiliary diaphragm blade 122 (B).

As shown in the figure, the minimum aperture diameter of the main aperture mechanism 110 becomes smaller as the focal length of the lens barrel 200 changes from tele to wide, similar to the open diameter formed by the sub-aperture mechanism 120.
However, in 5 frames, the drive start diameter of the main diaphragm mechanism 110 is a constant φetw.
Therefore, as the lens barrel 200 becomes wider from the telephoto, the aperture amount increases, and the aperture time T becomes longer as Tt <Tm1 <Tm2 <Tm3 <Tw.

(Relationship with frame speed)
Here, assuming that the time that the camera body 300 can use as the narrowing time in order to achieve the set frame speed of 10 frames / sec is Tmc, the time that can be used as the narrowing time in the case of 5 frames / hour is Tmc. Is twice as much as.

As shown in FIG. 3, the diaphragm is narrowed down from the drive start diameter φett of the main diaphragm mechanism 110, which is a constant value, to the set diaphragm diameter.
At this time, the maximum time is Tw when the lens is wide.
However, since 2Tmc> Tw, the specification can be achieved with the electromagnetic diaphragm diameter remaining in the telephoto state when the aperture is open.

However, as shown in FIG. 4, the focal length is a constant value from ft at the telephoto end to fmc at which the aperture time is Tmc from the telephoto end between the telephoto end and the wide end. It starts from the drive start diameter φett and is throttled to the set aperture diameter.
However, when the focal length is on the open side from fmc to fw and the drive start diameter is set from φett, the drive start diameter φet is reduced when the narrowing time is Tmc or more.

Then, the drive start diameter of the main diaphragm is driven to the electromagnetic diaphragm diameter position that secures Tmc. This time is the same as or shorter than Tmc. However, it is larger than the open diameter luminous flux diameter.
The open positional relationship between the main diaphragm blade 112 and the sub diaphragm blade 122 at fm2 is the state of the main diaphragm blade 112 (C) and the sub diaphragm blade 122 (C) shown in FIG.
Further, FIG. 6 is a partial cross-sectional view of the lens barrel similar to that of FIG. 2, but the main diaphragm blade 112 (C) which is the open positional relationship between the main diaphragm blade 112 and the sub diaphragm blade 122 at Tm2 in 10 frames. ) And the state of the auxiliary diaphragm blade 122 (C).

As described above, according to this embodiment, it has the following effects.
(1) The diaphragm drive start position is the drive of the diaphragm member (main diaphragm blade 112) from the diaphragm drive start position to the diaphragm position within the range on the outer diameter side of the diaphragm open diameter according to the change in the diaphragm open diameter. Changed to save time. Therefore, for example, even in the case of high-speed continuous shooting, the possibility that the high-speed continuous shooting speed is limited by the driving time of the diaphragm member (main diaphragm blade 112) is reduced.
Then, the presence or absence of the electromagnetic aperture drive at the time of opening is determined from the frame speed data and the focal length data of the zoom, and if it is determined to be necessary, the specification can be achieved by driving to an appropriate position.

(2) The aperture opening diameter defined by the opening diameter forming member (secondary aperture blade 122) changes according to the focal length. The diaphragm member (main diaphragm blade 112) of the present embodiment is changed according to a change in the diaphragm opening diameter, that is, a focal length.
(3) A continuous shooting speed information acquisition unit (lens control unit) 204 for acquiring continuous shooting speed information from the camera body 300 is provided, and the aperture drive start position is set to the continuous shooting speed information acquired from the continuous shooting speed information acquisition unit. It will be changed based on. Therefore, if the continuous shooting speed is not hindered, it is possible to select not to change the aperture drive start position, so that unnecessary power consumption can be suppressed.

(Transformed form)
Not limited to the embodiments described above, various modifications and changes as shown below are possible, and these are also within the scope of the present invention.
Although the embodiments may be used in combination as appropriate, detailed description thereof will be omitted. Further, the present invention is not limited to the embodiments described above.

100: Aperture device, 110: Main aperture mechanism, 111: Main aperture side rotating member, 111a: Shading plate, 112: Main aperture blade, 114: Holding plate, 120: Sub-aperture mechanism, 121: Sub-aperture side rotating member, 121a : Protrusion, 122: Secondary diaphragm blade, 123: Fixing member, 130: Stepping motor, 200: Lens barrel, 201: Zoom lens, 202: Encoder, 203: Memory, 204: Lens control unit, 300: Camera body, 302: Imaging unit, 303: Setting unit, 304: Camera control unit

Claims (5)

Aperture value information acquisition unit that acquires aperture value information from the attached camera body,
An open diameter forming member that defines the aperture open diameter and changes the aperture open diameter,
A diaphragm driven from a diaphragm drive start position having an aperture diameter larger than the diaphragm opening diameter to a diaphragm position having an aperture diameter smaller than the diaphragm opening diameter and achieving the diaphragm value acquired from the diaphragm value information acquisition unit. Members and
A diaphragm drive unit for driving the diaphragm member is provided.
When the diaphragm opening diameter becomes smaller within a range larger than the diaphragm opening diameter, the opening diameter of the diaphragm member at the diaphragm driving start position becomes smaller.
A lens barrel that features. The lens barrel according to claim 1.
The lens barrel has an optical system in which the focal length forming the image of the subject is variable.
The aperture opening diameter defined by the opening diameter forming member changes according to the focal length of the optical system.
A lens barrel that features. The lens barrel according to claim 2.
The aperture drive start position is changed according to the focal length of the optical system.
A lens barrel that features. Aperture value information acquisition unit that acquires aperture value information from the attached camera body,
An open diameter forming member that defines the aperture open diameter and changes the aperture open diameter,
A diaphragm driven from a diaphragm drive start position having an aperture diameter larger than the diaphragm opening diameter to a diaphragm position having an aperture diameter smaller than the diaphragm opening diameter and achieving the diaphragm value acquired from the diaphragm value information acquisition unit. Members and
With respect to a lens barrel provided with an aperture drive unit for driving the aperture member.
When the diaphragm opening diameter becomes smaller within a range larger than the diaphragm opening diameter, it is instructed that the opening diameter of the diaphragm member at the diaphragm driving start position becomes smaller.
A camera body featuring. Aperture value information acquisition unit that acquires aperture value information from the attached camera body,
An open diameter forming member that defines the aperture open diameter and changes the aperture open diameter,
A diaphragm driven from a diaphragm drive start position having an aperture diameter larger than the diaphragm opening diameter to a diaphragm position having an aperture diameter smaller than the diaphragm opening diameter and achieving the diaphragm value acquired from the diaphragm value information acquisition unit. Members and
With respect to a lens barrel provided with an aperture drive unit for driving the aperture member.
When the aperture opening diameter becomes smaller within the range larger than the aperture opening diameter, when the opening diameter of the aperture member at the aperture drive start position becomes smaller, the aperture member opens at the aperture drive start position. A program that causes the control unit of the camera body to perform a step that instructs the aperture to be smaller.

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