JPH0666021B2 - Aperture control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Technical Field of the Invention" The present invention relates to a manual aperture setting device and an automatic aperture setting device.
The diaphragm control device having both kinds of setting means is used for both the interchangeable lens and the fixed lens.

"Background of the Invention" As a conventional diaphragm control device, for example, there is one shown in FIG.

That is, in FIG. 1, the lens barrel is omitted and the aperture control device (1) is shown.
FIG. 2 is a perspective view schematically showing the diaphragm driving member (2), the cam ring (3), the arrow wheel (4), from the front along the optical axis.
A diaphragm (5) is provided, each member is rotatably supported by the lens barrel, and an optical path is formed in the central portion.

The aperture drive member (2) is provided with an aperture set end (2a) and an aperture drive lever (2b) which are locked by an aperture control lever (60) on the camera side to hold the aperture (5) in an open state until the release lead is pressed. ) Is bent, and is urged by the spring (2c) in the drawing direction. The other end (2e) is pivotally supported.

The cam ring (3) is provided with a manual aperture set end (3a) that engages with an aperture manual setting means (not shown) on the outer periphery of the cam ring (3), and a cam surface (3b) is formed on the inner periphery of the cam ring (3b). Is
A diaphragm braking pin (2d) provided upright on the diaphragm driving member (2) can be engaged.

The arrow wheel (4) is ring-shaped and has long holes (4a), (4
are connected in series, and one elongated hole (4a) is engaged with one diaphragm blade (5a) forming the diaphragm (5) via a connecting pin (5b). A diaphragm drive pin (4b) is implanted in the arrow wheel (4), and this pin (4b) is connected to the diaphragm drive lever (2b) of the diaphragm drive member (2). The diaphragm blades (5a) are connected by a link mechanism (not shown) so as to perform a diaphragm operation.

The aperture control lever (60) on the camera side is driven and controlled by the drive device (70). Before the release lead is pressed, the drive device (70) is used for both manual and automatic aperture settings.
Holds the diaphragm control lever (60) at the position where the maximum diaphragm diameter, that is, the solution diaphragm is obtained.

When the diaphragm is manually set, the drive device (70) displaces the diaphragm control lever (60) to a position where the minimum diaphragm diameter is obtained, as the release lead is pressed.

At the time of automatic aperture setting, the drive device (70) displaces the aperture control lever (60) to the position where the aperture diameter indicated by the electric signal output from the automatic aperture setting circuit (80) is obtained in accordance with the pressing of the release lead. . The members (60), (70), (80) constitute an aperture automatic setting means.

When performing aperture control with the aperture manual setting means,
The cam ring (3) is rotated by the manual aperture setting means via the manual aperture set end (3a), and the engagement state between the cam surface (3b) and the aperture braking pin (2d) is set in advance. When a release lead (not shown) is pressed, the aperture control lever (60) on the camera side releases the engagement with the aperture set end (2a), so the aperture drive member (2) is urged by the spring (2c). Is rotated, the diaphragm (5) is narrowed down from the open state via the diaphragm drive pin (4b) and the arrow wheel (4), and the diaphragm braking pin (2d) contacts the cam surface (3b) at the set position. Stopping the rotation of the diaphragm driving member (2) restricts narrowing of the diaphragm (5).

When the diaphragm is automatically controlled by the diaphragm automatic setting means, the control lever (60) is displaced along with the pressing of the release lead, and the diaphragm driving member (2) is rotated following this. At this time, the diaphragm drive device (70) regulates the displacement amount of the control lever (60) in accordance with the electric signal output from the automatic diaphragm setting circuit (80), so that the controlled diaphragm diameter corresponds to the electric signal.

However, in such a conventional diaphragm control device (1), since the state of the diaphragm (5) is restricted by the engageable state of the diaphragm braking pin (2d) and the cam ring (3), the diaphragm automatic setting means. There is a problem that the diaphragm (5) cannot be narrowed down from the diaphragm diameter regulated by the manual diaphragm setting means when adjusting the diaphragm.

This problem generally occurs in a camera provided with an automatic aperture setting means and a manual aperture setting means. Therefore, when the automatic aperture setting means is used, the minimum aperture diameter is always obtained by the manual aperture setting means. However, there was a problem that an error would occur in the aperture adjustment state and the scheduled shooting would not be possible unless otherwise.

"Object of the Invention" The present invention has been made in view of such conventional problems, and it is possible to appropriately use the automatic aperture setting means regardless of the state of the manual aperture setting means. An object of the present invention is to provide a diaphragm control device.

[Summary of the Invention] The gist of the present invention for achieving such an object is to adjust an aperture according to shooting in an aperture control device capable of setting an aperture in either a manual aperture setting state or an automatic aperture setting state. And an aperture manual setting means that is positioned by manual operation to regulate the state of the aperture,
Aperture automatic setting means that is automatically positioned to regulate the state of the aperture, and the aperture manual setting means and the aperture automatic setting means are provided separately, and the regulation of the aperture adjustment state is mutually performed by the setting means. An aperture control device is characterized in that it has a switching means capable of performing a switching operation so that the body side and the lens side are interlocked with each other without interfering with each other.

When the switching means is operated, the manual aperture setting means and the automatic aperture setting means are switched without interfering with each other, and in any setting state, the aperture setting is performed without being restricted by the other setting means. .

Since the regulation of the aperture adjustment state is switched between the body side and the lens side in conjunction with each other, smooth shooting can be performed without requiring a complicated operation.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an interchangeable lens of a single-lens reflex camera. The lens barrel (10) has a holding ring (11) holding lens groups (L1) and (L2) screwed onto a distance ring (12). The distance ring (12) is screwed onto the fixed ring (13), and the holding ring (11) and the fixed ring (13) are engaged with each other through a straight key (not shown) so that they cannot rotate relative to each other. A diaphragm preset ring (14) is rotatably fitted on the fixed ring (13), and a mount part (16) is attached to the end face part (15).
Are formed.

The diaphragm control device (20) is built in the lens barrel (10), and referring to FIG. 3 as well, the holding ring (11) allows the diaphragm (21) to perform a diaphragm operation and the arrow wheel (22) to rotate. A cam ring (23) and a diaphragm driving member (24) are rotatably supported by the fixed ring (13).

The diaphragm (21) is formed by connecting a plurality of diaphragm blades (21a), (21a) ... so as to be capable of diaphragm operation by a link not shown, and one diaphragm blade (21a) and a radial direction connected to the arrow wheel (22). One of the elongated holes (22a) is connected via a connecting pin (21b) planted in the diaphragm blade (21a).

The cam ring (23) is a manual aperture set end (23a) that engages with the aperture preset ring (14) which is the aperture manual setting means.
Are projected on the outer circumference, and a cam surface (23b) is formed on the inner circumference.

The diaphragm drive member (24) is connected to the diaphragm control lever (60
The aperture set end (24a) and the aperture drive lever (24b) that are locked to (0) are bent and formed.

Further, the diaphragm driving member (24) is biased in the drawing direction by the spring (24c), and the diaphragm driving lever (24b) and the arrow wheel (2)
It is connected to 2) by a diaphragm drive pin (22b) that is planted in the arrow wheel (22).

The aperture control lever (600) on the camera side is the drive unit (700).
Is controlled by. Before the release lead is pressed, the drive device (70
0) holds the aperture control lever (600) at a position where the maximum aperture diameter, that is, the open aperture is obtained.

When the aperture is manually set, the mobile device (700) displaces the aperture control lever (600) to a position where the minimum aperture diameter is obtained, as the release lead is pressed.

At the time of automatic aperture setting, the drive unit (700) displaces the aperture control lever (600) to the position where the aperture diameter indicated by the electric signal output from the automatic aperture setting circuit (800) is obtained in accordance with the pressing of the release lead. . Above member (600), (700), (80
0) constitutes automatic aperture setting means. The automatic setting circuit (800) is connected to a switch (800a) that switches whether or not the circuit operates. The switch (800a) is
It is turned on / off by the aperture setting mode selection knob described later.

Then, a connecting lever (30) that constitutes a switching means between the automatic diaphragm setting means and the manual diaphragm setting means is disposed adjacent to the cam ring (23) and the diaphragm driving member (24), and the connecting lever (30). The base end portion (31) of the is supported by the fixing ring (13) via a pivot shaft (32) so as to be rotatable and movable in the axial direction of the pivot shaft (32).

Referring also to FIGS. 4 and 5, the connecting lever (30) is moved forward (see FIGS. 4 and 5) by the biasing spring (33).
A right end of the drawing), the throttle control pin (35) engaging the cam surface (23b) of the cam ring (23) and the aperture drive member (at the tip end (34) of the connecting lever (30). twenty four)
Throttle braking pin (36) that can be engaged with and disengaged from the braked end surface (24e) of
Are erected symmetrically in the front and back.

The end face (15) of the fixing ring (13) has a transmission pin (40).
Are slidably supported. One end (41) of the transmission pin (40) is brought into contact with the front surface (37) of the connecting lever (30), a flange (42) is formed in the middle portion, and the other end has a substantially hemispherical expanding portion (43). ) Has been formed. The transmission pin (40) is slidably supported by the distance between the flange (42) and the expansion head (43).

A dish-shaped recess (15a) is formed on the surface side of the end face (15), and the expansion head (43) of the transmission pin (40) can be projected and retracted at the center of the recess (15a) to mount the mount. A switching operation pin (51) is provided on the body (50) of the camera at a position corresponding to the expansion head (43) when the lens barrel (10) is accurately fixed via the portion (16).

A piston member (53) is slidably supported by a support cylinder portion (52) formed in the body (50), and a switching operation pin (51) is projected in the piston member (53) via a spring (54). The tip end portion (51a) of the switching operation pin (51) is formed in a hemispherical shape by being urged toward and retracted.

The end surface of the piston member (53) is pushed and slid by a cam plate (200) provided coaxially with the aperture setting mode selection knob (100).

The cam plate (200) also displaces the movable contact piece of the switch (800a).

Then, when the lens barrel (10) is fixed to the body (50), even if the aperture manual setting means (14) and (23) are set to the maximum aperture diameter, the braked end surface of the aperture drive member (24). (twenty four
The aperture control lever (600) is set so that the aperture drive member (24) is further rotated from the open side so that a gap is formed between the e) and the aperture braking pin (36). 24a) is locked. This allows the connecting lever (3
The sliding of (0) is reliably performed without being interfered by the diaphragm driving member (24).

In the diaphragm control device (20) having the above-described configuration, the diaphragm driving member (24) is in the state shown in FIGS. 3 and 4 when photographing is performed by manually setting the diaphragm. That is, the axis (32)
The stop braking pin (36) and the braked end surface (24e) of the stop driving member (24) are in a engageable positional relationship, and the stop (600) and the stop driving member (24) are used to stop the stop ( twenty one)
Is held open.

When the aperture preset ring (14) is rotated, the cam ring (23) is rotated via the manual aperture set end (23a), and the engagement state between the cam surface (23b) and the aperture control pin (35) is set. Since the aperture can be changed, it is possible to set an appropriate aperture manually according to the rotation amount of the aperture preset ring (14).

When the release lead is pressed, the stop of the aperture set end (24a) by the aperture control lever (60) is released and the aperture drive member (2
4) is rotated by the urging force of the spring (24c), and the aperture braking pin (36) is at the position set by the engagement state of the cam surface (23b) of the cam ring (23) and the aperture control pin (35). When the braked end surface (24e) contacts the diaphragm drive member (2
4) Aperture (21) via the arrow wheel (22) according to the rotation of
Is narrowed down to a predetermined aperture value.

When shooting with the automatic aperture setting, select the control knob (100) on the camera body side according to the automatic aperture setting method.
When the cam plate (200) is rotated, the piston member (53) is pushed, whereby the switching operation pin (51) pushes the expansion head (43) of the transmission pin (40), and the spring (54) is attached. Since the urging force is sufficiently larger than the urging force of the urging spring (33), the spring (54) hardly bends, and the transmission pin (40) slides by the movement amount of the piston member (53) and is retracted. The state becomes as shown in. At this time, the switch (800a) is turned on because the interference of the cam plate (200) is released, and the automatic aperture setting circuit (800) becomes operable.

In this state, the throttle braking pin (36) of the connecting lever (30)
Is out of the position where it can be engaged with the braked end surface (24e) of the diaphragm drive member (24), the diaphragm set end (24a) is released from the lock of the control lever (600) when the shutter is released. , Even when the aperture (21) is narrowed down from the aperture value set by the cam ring (23), the braked end surface (24e) engages the aperture braking pin (36) when the aperture drive member (24) rotates. Pass without passing. That is, it does not interfere.

The control lever (60) is stopped by displacing by an amount corresponding to the electric signal of the automatic setting circuit (800), the stop set end (24a) is locked by this, and the stop (21) is indicated by the electric signal. The aperture is narrowed down to the aperture value.

When the photographing by the automatic diaphragm setting means is completed, the diaphragm driving member (24) is restored by the returning force of the body side diaphragm control lever (600) to the position before the shutter release, and the fifth diaphragm is again displayed.
It will be in the state shown in the figure.

After that, when the photographing by the automatic aperture setting means is canceled and the photographing is performed by the manual setting, the piston knob (53) is retracted by operating the selection knob (100) so that the state shown in FIG. 4 is obtained. . Then, the braked end surface (24e) of the diaphragm drive member (24) is in a position where it does not engage with the diaphragm braking pin (36) even if the cam ring (23) is set to the open position, so that the connecting lever (30). Is returned to the state shown in FIG. 4 by the urging force of the urging spring (33).

Next, a case where the lens barrel (10) is attached to and detached from the body (50) will be described.

First, when the aperture is manually set (Fig. 4), the lens barrel (10) is rotated to change the positional relationship between the body (50) and the end surface portion (15) of the fixing ring (13). Also switch operation pin (5
1) does not project due to the action of the flange 42, and the transmission pin (4
Since the expansion head (43) of (0) does not further project, the switching operation pin (51) and the transmission pin (40) do not interfere with each other, and there is no hindrance to the attachment / detachment of the lens barrel (10).

When the lens is removed from the camera when the aperture is set automatically (Fig. 5), when the lens barrel (10) is rotated, the expansion head (43) of the transmission pin (40) causes the switching operation pin (51). It comes off from the tip (51a) of the
It moves to the right in the figure by the urging force of 3) and
3) protrudes. In addition, the tip of the switching operation pin (51) (5
1a) is in the recessed portion (15a) of the end face portion (15), and the state shown in FIG. 6 is obtained.

Further, when the lens barrel (10) is further rotated so that the end face portion (15) moves downward and the body (50) moves upward in FIG. 6, the expansion head (43) of the transmission pin (40) moves to the body. (Five
Slide along the surface of the mounting part of (0), and switch operation pin (5
The tip portion (51a) of 1) slides along the inner surface of the recessed portion (15a). At that time, the switching operation pin (51) is pulled in against the elastic force of the spring (54), and finally reaches the surface of the end face portion (15).

When the mounting part (16) is disengaged, the lens barrel (10) is released and can be disengaged from the camera body, and the switching operation pin (5
1) is projected by the elastic force of the spring (54).

When the lens barrel (10) is attached to the camera body, switching operation can be performed by bringing the surface of the body (50) and the surface of the end face portion (15) into close contact so that the mount portion (16) engages with the camera body. The tip (51a) of the pin (51) is pushed and retracted against the elastic force of the spring (54). When the lens barrel (10) is rotated, the tip (51a) of the switching operation pin (51) is rotated. ) Falls into the indented portion (15a) and becomes the state shown in FIG.

Therefore, the end face part (15) is located above the body (5
When the lens barrel (10) is rotated so that (0) moves downward,
The hemispherical side surface of the tip portion (51a) of the switching operation pin (51) pushes the hemispherical side surface of the expansion head (43) of the transmission pin (40), and the cam plate 200 pushes the piston member (53) largely. If so, the elastic force of the spring (54) is stronger than the elastic force of the biasing spring (33), so the transmission pin (40) is retracted and the diaphragm automatic setting state shown in FIG. 5 is obtained.

In this way, the lens barrel (10) can be attached and detached in any aperture setting state.

In the above embodiment, the switching of the aperture setting state is performed on the camera body side, but the switching may be performed on the lens barrel side. In this case, the fact that the setting state has been switched is transmitted to the camera side by a mechanism equivalent to that in FIG. 4, and the switch (800a) is switched by this to control whether or not the automatic aperture setting circuit (800) can operate. Just do it. Further, in the present embodiment, the fact that the aperture setting state has been switched was transmitted from the camera to the lens by a mechanical signal, but the present invention is not limited to this, and is transmitted by, for example, an electric signal to operate the electromagnetic device, The connecting lever (30) may be slid. Further, it goes without saying that the present invention can be applied to a camera in which the lens barrel is completely fixed to the camera body and a lens whose adjustment state is adjusted to the open side.

[Advantages of the Invention] According to the aperture control device of the present invention, even when the aperture is switched to the automatic aperture setting state, it is possible to perform shooting by the complete aperture automatic setting means without the need to operate the manual aperture setting means. In addition, the operability is improved, and the situation of improper exposure does not occur. Since the regulation of the diaphragm adjustment state is switched between the body side and the lens side in conjunction with each other, smooth photographing can be performed without requiring a complicated operation.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a conventional aperture control device,
2 to 6 show an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a half of the interchangeable lens from the center line, and FIG. 3 is a perspective view schematically showing an aperture control device. 4 to 6 are cross-sectional views of the main part, and FIG.
The figure shows the aperture automatic setting state, and FIG. 6 shows the intermediate state of lens exchange. (10) …… Body, (20) …… Aperture control device (21) …… Aperture, (22) …… Arrow wheel (23) …… Cam ring, (24) …… Aperture drive member (30) …… Coupling lever

Claims (1)

[Claims] 1. A diaphragm control device in which the diaphragm can be set in either a manual diaphragm setting state or an automatic diaphragm setting state, and a diaphragm adjusted according to photographing and a state of the diaphragm adjusted by manual operation are set. A manual aperture setting means to regulate,
Aperture automatic setting means that is automatically positioned to regulate the state of the aperture, and the aperture manual setting means and the aperture automatic setting means are provided separately, and the regulation of the aperture adjustment state is mutually performed by the setting means. A diaphragm control device comprising: switching means capable of switching operation so that the body side and the lens side are interlocked with each other without interfering with each other.