JPS5943538Y2 - Aperture setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an aperture setting device for an interchangeable lens in which the stop position of an aperture member is set on the lens mounting member side in relation to the rotation of a lens side aperture setting ring.

Conventionally, in interchangeable lens barrels for single-lens reflex cameras, each interchangeable lens has an aperture setting mechanism that sets the stop position of the aperture operating ring in accordance with the rotation of the aperture setting ring that sets the aperture value. As a result, interchangeable lenses became expensive, and at the same time, the lens barrel became larger, which hindered efforts to make the lens smaller and lighter.

Also, when applying this lens to an automatic exposure camera that prioritizes aperture, the aperture value is set by the aperture setting mechanism built into the lens barrel, but when applying this lens to an automatic exposure camera that prioritizes shutter speed, requires a separate aperture setting mechanism on the camera body side in addition to the aperture setting mechanism on the lens side, and the lens side has to set the aperture setting ring to the maximum aperture position and release the aperture setting mechanism on the lens side. Not,
If you forget this, there is a drawback that the aperture will not be set to the appropriate aperture.

Additionally, when using an auto-exposure camera that prioritizes both aperture and shutter speed, in aperture-priority mode, if the set aperture value is inappropriate and the appropriate exposure cannot be obtained within the shutter speed variable range, the aperture value will be automatically shifted. It was impossible to obtain proper exposure using

In order to solve the above problems, the applicant first provided a connecting part at a predetermined angle position starting from the open aperture scale position on the aperture setting ring with the aperture scale provided on the lens barrel side, and An aperture interlocking ring having a camera side connecting part that engages with the lens side connecting part is provided on the side to integrally connect both rings, and the stop position of the aperture operating ring is set according to rotation of this aperture interlocking ring. We have proposed an aperture setting device for a single-lens reflex camera that has a simple structure and solves the drawbacks of conventional cameras by providing an aperture stop mechanism that eliminates the need for an aperture setting mechanism on the lens barrel side.

This invention provides an aperture setting device suitable for cases where the lens mounting member to which the interchangeable lens having the above-mentioned configuration is to be mounted has restrictions in the thickness direction, such as the lens mounting frame of a bellows close-up photographing device. It is something.

Embodiments of this invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a bellows close-up photographing device to which this invention is applied, which is equipped with a lens and a camera body, respectively, where 1 is an interchangeable lens, 2 is a camera body, and 3 is a bellows close-up photographing device.

The bellows close-up photography device 3 includes a lens mounting frame 31 to which the interchangeable lens 1 is mounted, and a camera mounting frame 32 to which the camera body 2 is mounted.
, a bellows 33 that connects both mounting frames 31 and 32 in a light-tight manner in an elastic manner, and a guide rule 34 that slidably attaches both mounting frames 31 and 32, and a release provided on the lens mounting frame 31. - The two release ends 4a of the double cable release 4 are inserted into the release hole 35 and the release hole 21 of the camera body 2,
4b is connected to the husband, and the lens mounting frame 31 is provided with a manual aperture button 36 in line with the release hole 35.

On the other hand, as shown in FIG. 2, the interchangeable lens 1 is integrally fixed to an aperture setting ring 11 having an aperture scale on its outer periphery and an aperture operating ring (not shown) biased in the aperture direction. The rear end surface of the aperture setting ring 11 has a diaphragm operating piece 12 that protrudes rearward through a long groove 1a on the rear surface of the diaphragm setting ring 11. A connecting protrusion 118 as a lens-side connecting portion is provided protrudingly at a position at a predetermined angle θ common to the lenses.

Further, on the front surface of the frame 31 with the bellows close-up photographing device 3, an unillustrated mount (not shown) corresponding to the lens side mount is fixed, and around the mount there is an aperture interlocking ring as shown in FIG. 37 is rotatably mounted, a spring 38 is engaged between it and a fixed part to have a right-handed rotation behavior, and the front side engages with the connecting protrusion 11a of the V-lens side diaphragm setting ring 11. Connection protrusion 37 as a connection part of the rule. is installed protrudingly.

39 is a pin protruding from the rear end surface of the aperture interlocking ring 37;
40 is an interlocking lever whose one end is pivotally connected to this pin 39, and a pin 41 is implanted at the other end of this interlocking lever 40, and this pin 41 is attached to the lens mounting frame 131 along the radial direction of the lens. It fits loosely into the cut guide groove 42 (in the vertical direction in the figure), and a stopper pin 43 is located in the middle of the interlocking lever 40.
mosquitoes have been planted.

A horizontal shaft 44 is installed at the base of the lens mounting frame 31 so as to be perpendicular to the guide groove 42, and an aperture setting slide 45 is attached to this shaft 44 so as to be able to slide left and right. It will be done.

Reference numeral 45a denotes a protruding piece provided on the aperture setting slide 45, which engages with the aperture actuation piece 12 of the interchangeable lens 1 and moves the aperture actuation piece 12 counterclockwise against the biasing force in the aperture direction to aperture the aperture. is held open.

Reference numeral 47 denotes an intermediate lever pivotally connected to the lens mounting frame 31 by a shaft 48, and one end of which engages with the notch 45b of the aperture setting slide 45.

Reference numeral 49 denotes an aperture drive lever pivotally connected to the lens mounting frame 31 by a shaft 50. A pin 51 implanted in one end of the lever engages with one end of the intermediate lever 47 (7), and the other end is connected to the double cable release 4. It engages with the tip portion 4a and the manual narrowing button 36.

Here, when the double cable release 4 is pushed in the full stroke, the left turning force exerted on the aperture interlocking ring 37 by the biasing force of the difference between the tip 4a and the spring 46 via the aperture setting slide 45 and the stopper pin 43 is 38 is smaller than the right turning force exerted on the aperture interlocking ring 37.

With the above configuration, when the lens measuring aperture setting ring 11 is rotated counterclockwise from the open position shown in FIG. 2 to set the desired aperture value, the lens side connecting protrusion 11, L connects to the lens mounting frame side. The projection 378 is pressed to rotate the aperture interlocking ring 37 in the same direction against the spring 38.

As the aperture interlocking ring 37 rotates counterclockwise, the pin 41 at the other end of the interlocking lever 40, whose one end is pivotally connected to the pin 39 of the aperture interlocking ring 37, slides up and down in the guide groove 42, and moves to the stopper. The position of pin 43 changes to the third position depending on the set aperture value.
It is uniquely defined as shown in the figure.

Next, when the double cable release 4 is pressed, the release end 48 on the bellows close-up device 3 side first protrudes, causing the diaphragm drive lever 49 shown in FIG. Interlocking with the intermediate lever 47, the aperture setting slide 45 moves to the right in a direction perpendicular to the guide groove 42 against the spring 46, and as the projection 45a comes into contact with the stopper pin 43, the aperture setting slide 45 moves to the right. Stopper pin 43
is pressed to the right, the interlocking lever 40 is rotated clockwise, and the aperture interlocking ring 37 is attempted to be rotated counterclockwise, but since the clockwise rotation force exerted by the spring 38 is stronger, the movement of the aperture setting slide 45 is stopped.

When the diaphragm setting slide 45 moves to the right, the diaphragm actuating piece 12 on the replacement lens side that engages with the protruding piece 45a is released from its restraint, and is moved by its own biasing force to the protruding piece 45. The lens rotates to the left until it reaches the stop position, and the aperture is narrowed down according to the set aperture value.

Next, when the double cable release 4 is pressed more deeply, one release end 4a remains in the protruding state while the other release end 4b protrudes, and the camera body 2 is released to take a picture (FIG. 1M).

When the pressure on the double cable release 4 is released, the release ends 4as4b are retracted together, and the aperture setting slide 45 is moved by the spring 46 to the intermediate lever 47. Aperture drive lever 49
and the interchangeable lens side diaphragm actuating piece 12, respectively, and move to the left to return to the state shown in the second row.

In addition, if you want to check only the aperture effect due to the aperture, regardless of the release operation, you can press the aperture drive lever by pushing the manual aperture button 36 to the left in Fig. 2, regardless of the double cable release 4. 49 to the left, the aperture of the interchangeable lens 1 can be set to a predetermined value in the same manner as described above.

By appropriately determining the length of the interlocking lever 40 and the position of the pin 39.4143, the aperture actuating piece 12 can be rotated at a predetermined angle (for example, 7.5°) for each aperture value of the aperture interlocking ring. It can be converted into a rotation of an angle (for example, 4.5°), and the error is calculated to be less than /1o, and can be completely ignored in practice.

In the above embodiment, a case where this invention is applied to a bellows close-up photographing device has been described, but it goes without saying that this invention is not limited to this and can be applied to a camera body or other devices.

The connection parts on the housing, lens 1 rule, and lens mounting frame side are not limited to the protrusions as in the above embodiment, but can be engaged with each other to transmit the rotation of the aperture setting ring 11 to the aperture interlocking ring 37. Good to have.

As described above, according to this invention, an aperture setting device with an extremely simple structure and reliable operation can be incorporated into a flat lens mounting member using a lens that does not have an aperture setting mechanism on the lens side. It becomes possible to supply a photographing device such as a bellows close-up photographing device at a low cost.

[Brief explanation of drawings]

Fig. 1 is a side view showing the external appearance of a bellows close-up photographing device to which this invention is applied, Fig. 2 is a perspective view showing an aperture setting device according to this invention incorporated in the bellows close-up photographing device, and Fig. 3 is an explanatory diagram of its operation. It is. 1... Interchangeable lens, 2... Camera body, 3... Bellows close-up device, 4... Double cable release, 11... Aperture setting ring,
12... Comparison operation piece, 36... Manual aperture button, 37... Aperture interlocking ring, 40...
... Interlocking lever 42 ... Guide groove, 43 ...
...Stopper pin, 45...Aperture setting slide.

Claims (1)

[Scope of utility model registration request] It has an aperture scale on its outer periphery and is fixed to an aperture setting ring with a connecting part at a predetermined angular position starting from the open aperture scale position, and an aperture operating ring that is biased in the aperture direction and protrudes rearward. an aperture interlocking ring that has a connecting part that engages with the lens side connecting part and that moves together with the aperture setting ring; One end is pivotally connected, the other end is slidably fitted into a guide groove provided along the radial direction of the lens, and has a stopper pin in the middle, and an interlocking lever that is always connected to the diaphragm actuating piece on the side of the interchangeable lens. and an aperture setting slide that is restrained at an aperture open position, released from the restraint in conjunction with a release operation, and displaced in a direction perpendicular to the guide groove to follow the aperture operating piece until it abuts the stopper pin. An aperture setting device characterized by: