JP3650667B2 - Shift / tilt adapter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shift / tilt adapter that enables shifting and tilting by interposing between a camera body and a photographing lens in a camera that can exchange lenses and has no tilt function.
[0002]
[Prior art]
At present, a normal camera using 135 film or 120/220 film is configured such that the optical axis of a photographing lens (hereinafter simply referred to as “lens”) intersects the screen perpendicularly at the center of the screen.
On the other hand, in a large format camera of 4 × 5 or larger, the intersection of the lens optical axis and the screen is shifted up, down, left or right outside the center of the screen, and the angle of intersection between the lens optical axis and the screen is tilted. Some have tilt mechanisms such as swing or tilt that change direction from side to side or up and down.
[0003]
With this tilt mechanism, during the rise, fall, and shift (hereinafter referred to as “shift”), the field of view is moved up and down and left and right without changing the orientation of the camera to correct or exaggerate image distortion. In swing and tilt (hereinafter referred to as “tilt”), the depth of field in the left-right or vertical direction can be increased or decreased.
[0004]
These tilt mechanisms are rarely used individually, and in most cases, by combining several of them, it is possible to exert a wide variety of tilt effects, which is essential especially in the fields of architectural photography and product photography. There is also a strong demand for a tilt mechanism for medium format cameras using 120/220 film.
[0005]
However, when the tilt mechanism is mounted on the camera body with a medium format camera that requires portability and mobility, the camera body becomes extremely large and heavy, and handheld shooting becomes almost impossible. For this reason, various interchangeable lenses with tilt mechanisms that can be mounted on cameras that do not have tilt functions have been developed.
[0006]
US Pat. No. 4,229,094 discloses a tilt lens that includes a shift mechanism and a tilt mechanism on the lens side and includes a rotation transmission means for transmitting the rotation of the camera side rotation member to the lens side rotation member. Is known. This is because the vertical and horizontal shift mechanisms and the vertical tilt mechanism are provided in the lens barrel, and the universal joint provided in the lens barrel substantially parallel to the lens optical axis is used to rotate the shutter charge ring on the camera side. Via a lens shutter set member.
[0007]
Moreover, it was described in each gazette of Japanese Patent Publication No. 5-33363, Japanese Patent Publication No. 5-33364, Japanese Patent Publication No. 5-33365, Japanese Patent Publication No. 5-33765, and Japanese Patent Publication No. 5-40881 concerning the application of the present applicant. The tilting lens with lens shutter allows tilting in all directions without increasing the size of the lens barrel by making the relative positional relationship between the camera-side rotating member and the lens-side rotating member unchanged in any shift state. In addition, the lens side lens shutter can be reliably charged and released from the camera side.
[0008]
[Problems to be solved by the invention]
However, in such a conventional tilt lens, the shutter charge interlocking mechanism provided in the lens barrel is complicated, and not only the size and weight of the lens are remarkably increased, but also the productivity is low. There was a tendency to become very expensive.
In order to avoid such a point, the use of a dedicated interchangeable lens is abandoned. For example, an interchangeable lens for a medium format camera with a long flange back is shifted to a lens adapter for mounting on a 35 mm format camera with a shorter flange back. Although an adapter with a tilt mechanism incorporating a mechanism or a tilt mechanism has also appeared, none of them has a rotation transmission mechanism such as a diaphragm or a shutter.
[0009]
However, with the recent spread of digital photography, for example, an electronic device equipped with a large-sized (30 × 30 mm) image sensor (CCD) with about 6 million pixels that can be mounted on a 6 × 7 cm single-lens reflex camera that can be replaced back. A digital back for photography has been developed, and since it is easy to process images, it has come to be used especially for photography of advertising photographs in the studio.
In such product shooting, the focal length of the lens used is 140 to 180 mm, the shooting distance is about 1 m, and the direction that requires tilting is almost always the vertical direction.
[0010]
Now, when shooting at a shooting distance of 1.1 m using a lens with a focal length of 140 mm, the lens extension amount is approximately 24 mm. With this amount of extension, a shift / tilt adapter having a tilt function can be interposed between the current lens and the camera body, and by taking out the lens, photographing at a closer distance becomes possible.
The present invention has been made in view of the above points, and an object of the present invention is to provide a shift / tilt adapter that is interposed between a camera and a lens to enable tilting operation.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a camera-side member that can be attached to a camera-mountable camera mount, and a detachable lens-side member that can be shifted and tilted on the camera-side member. , A shift / tilt adapter including rotation transmission means for transmitting rotation of the camera side rotation member to the lens side rotation member, wherein the rotation transmission means is provided on the camera side member and the lens side member. And a pair of universal joints interlocking with the lens side rotation member, and a slide member that moves the pair of universal joints in the rotational direction and slidably connects in the axial direction. A shift / tilt adapter provided on a surface substantially orthogonal to the optical axis is provided.
[0012]
In the shift / tilt adapter, the camera side member is composed of a substrate mounted on the mount portion of the camera and a shift plate slidable by a predetermined distance on the substrate, and the lens side member is the shift plate. It is preferable to attach to a predetermined angle tiltable.
[0013]
In the shift / tilt adapter described above, it is preferable that the lens side member and the shift plate are connected by a bellows, and the information transmission contact provided on each mount portion of the camera side member and the lens side member is provided. It is even better if they are connected by a flexible printed circuit board.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Prior to that, referring to FIG. 10, a schematic configuration of a camera to which the present invention is to be implemented, in particular, a rotation transmission mechanism between the camera side and the lens side. And explain briefly. FIG. 10 shows the charge completion state.
[0015]
This camera 100 is a 6 × 7 cm lens shutter type single-lens reflex camera with a replaceable lens and film back, and is centered on the optical axis of the lens through a camera body 101, a replaceable photographing lens 102 and a revolving adapter (not shown). As shown in FIG. 1, the film back is formed by switching the screen vertically and horizontally by rotating 90 degrees.
A lens board 103 having a mount to which the photographic lens 102 can be attached is connected by a camera body 101 and a bellows 104, and is drawn out by a rack and pinion mechanism (not shown). In addition, the mount portion of the lens board 103 and the mount portion of the photographing lens 102 are provided with a plurality of information transmission contacts (not shown) that are connected when the lens is mounted.
[0016]
The camera body 101 has a mirror frame 105 and a light shielding plate 106 inside, and the shaft 108, the lever 109, the gear 110, the pinion 111, and the winding shaft 112 are wound in the winding direction by rotating the winding lever 107 downward by approximately 75 degrees. And the return spring 113 is stored. The rotation of the winding shaft 112 is transmitted to the bevel gear 115 via the bevel gear 114, and a gear 117 fixed to the tip of the rotation shaft 116 that moves in the rotational direction of the bevel gear 115 and is slidable in the longitudinal direction. A charge ring 118 that can rotate around the optical axis of the lens on the lens board 103 is rotated by a predetermined angle.
[0017]
The rotation of the gear 110 is also transmitted to the gear 119, and the mirror actuating lever 120 integrated with the gear 119 is rotated clockwise to return the mirror frame 105 and the light shielding plate 106 from the flipped-up state to the set state. After the spring 121 that springs up the mirror frame 105 and the light shielding plate 106 sequentially is stored, the mirror operating lever 120 is locked at the stored position.
[0018]
On the other hand, a lens shutter (not shown) is incorporated in the lens barrel of the photographing lens 102, and a shutter operating ring that rotates around the optical axis of the lens is provided on the rear surface thereof. The pair of protruding connection pins 122 and 122 are fitted into the connection holes 118 a and 118 a of the charge ring 118 of the camera side lens board 103, so that the rotational force is transmitted. FIG. 10 shows a case where both the charging mechanism of the camera body 101 and the lens shutter on the lens side are in a charged state.
[0019]
When the release button 123 is pressed from this state, the mirror operating lever 120 is unlocked and rotated counterclockwise, the mirror frame 105 is flipped up, and the charge ring 118 moves the shutter operating ring to the shutter release. The shutter blades that are in the open state are closed. Next, the shading plate 106 is flipped up, and the aperture is narrowed down to a predetermined value just before the completion of the lifting, and then exposure is performed for a predetermined time.
The shift / tilt adapter according to the present invention is interposed between the lens board 103 and the photographing lens 102 of the camera 100 configured as described above.
[0020]
1 and 2 show an unshifted state of one embodiment of the present invention. FIG. 1 is a rear view showing the surface of the camera side member facing the lens side member, and FIG. FIG. 3 is a rear view showing a surface of the lens side member facing the camera side member, FIG. 4 is a front view showing the outer surface side, and FIG. 5 is a camera side member and lens. It is a sectional side view which shows the state at the time of the non-shift and non-tilt in the assembly | attachment state with a side member.
[0021]
Referring to FIGS. 1 and 2, the camera side member 10 includes a substrate 12 having a mount portion 11 that can be attached to and detached from the mount portion of the camera side lens board 103 on the outer surface side as shown in FIG. In the figure, it consists of a shift plate 13 slidable approximately ± 10 mm in the vertical direction. The mount portion 11 is bayonet-coupled to the mount portion of the lens board 103 by rotating the lock ring 14 by a predetermined angle.
[0022]
The mount portion 11 is provided with an interlocking ring 15 that is rotatable around the optical axis, and a pair of connecting pins 16, 16 projecting from the interlocking ring 15 are connected to the connecting holes 108 a of the charge ring 118 on the lens board 103 side. By being connected to 108 a, the rotation on the camera body 101 side is transmitted to the interlocking ring 15. In FIG. 2, 17 is a lock screw for fixing the shift plate 13 to the substrate 12, and 18 is an information transmission contact for transmitting information on the lens board 103 side.
[0023]
As shown in FIG. 1, a tooth portion 15 a is provided on the interlocking ring 15 on the inner surface side of the camera side member 10, and its rotation is transmitted to the pinion 23 via the pinions 21 and 22, and the bevel gear 24 integrated with the pinion 23 is provided. The bevel gear 25 is rotated via the rotation axis to convert the rotation axis to a right angle. Then, the rotation of the bevel gear 25 is transmitted to the connecting shaft 27 having an oval cross section through the universal joint 26. Note that one end of a flexible printed circuit board 51 that fixes the information transmission contact 18 to the mount portion of the lens side member 30 is fixed below the inner surface of the mount portion.
[0024]
On the other hand, as shown in FIG. 4, the lens-side member 30 is provided with a mount 31 on the outer surface side to which the photographic lens 102 can be attached and detached, and an information transmission provided at the lower portion corresponding to the information transmission contact on the photographic lens 102 side. A contact 32 is provided and is connected from the inner surface to the information transmission contact 18 of the camera side member 10 via the flexible printed circuit board 51 (FIG. 3).
[0025]
As shown in FIG. 3, the inner surface side is provided with an interlocking ring 33 that rotates around the lens optical axis in the mount portion 31 (FIG. 4), and the tooth portion 33a is connected to the pinion 36 via the pinions 34 and 35. The rotation of the bevel gear 37 integral with the pinion 36 is transmitted to the bevel gear 38 which is orthogonal to the axial direction, and the rotation is transmitted via the universal joint 39 to the connecting shaft 27 of the camera side member 10 shown in FIG. It is made to interlock | cooperate with the connection sleeve 40 which has the oval-shaped shaft hole 40a fitted to slidably.
[0026]
The bevel gears 25 and 38 are positioned in the vertical direction in the figure with the inner surface examples of the camera side member 10 and the lens side member 30 facing each other in parallel, and the connecting shaft 27 and the connecting sleeve 40 are slidable. The slide member 41 (see FIG. 5) formed by being inserted into the lens is on a plane orthogonal to the lens optical axis A (the paper surface of FIGS. 1 to 4), and the axial direction thereof substantially coincides with the shift direction.
[0027]
In this state, the shaft holes of the bearing portions 10a and 10b protruding from the left and right sides on the inner surface side of the camera side member 10 are screwed to the protrusions 30a and 30b provided corresponding to the left and right sides of the inner surface side of the lens side member 30, respectively. The lens side member 30 can be tilted approximately ± 8 degrees in the vertical direction with respect to the shift plate 13 of the camera side member 10 so as to be pivotally supported by the shafts 42, 42, and fixed at a required angular position (not shown). Fix by means.
Finally, the outer periphery of the lens side member 30 and the shift plate 13 is covered with a bellows 52 to prevent the entry of external light and to conceal the internal mechanism.
[0028]
Since this shift / tilt adapter is configured as described above, when the lens side member 30 is tilted in the vertical direction with the shaft screws 42 and 42 as fulcrums in the state shown in FIG. 5, the lens optical axis A passes through the center of the screen. It is possible to take a picture in a tilted state inclined from the screen center axis (which coincides with the lens optical axis in a state not shifted or tilted) B perpendicular to the screen.
[0029]
In the state shown in FIGS. 6 and 7 in which the shift plate 13 is shifted upward by a predetermined length from the state shown in FIGS. 1 and 5, the lens optical axis A is translated upward from the screen center axis B in the shifted state. In this state, the lens side member 30 can be tilted upward or downward with the shafts 42 and 42 as fulcrums to obtain the state shown in FIG. 8 or FIG.
Although not shown, it goes without saying that the shift plate 13 can be tilted in the vertical direction while being shifted downward.
[0030]
Thus, when shifting up and down, a slide member comprising the connecting shaft 27 provided on the shift plate 13 of the camera-side member 10 and the connecting sleeve 40 that moves in the rotational direction and is slidable in the axial direction. 41 only expands and contracts, the rotation of the camera side charge ring 118 causes the connection pin 16 of the camera side member 10, the interlocking ring 15, the teeth 15 a, the pinions 21, 22, 23, the bevel gears 24, 25, the universal joint 26. , Is transmitted to the connecting sleeve 40 of the lens side member 30 through the connecting shaft 27.
[0031]
The rotation of the connecting sleeve 40 is transmitted to the interlocking ring 33 through the universal joint 39, the bevel gears 38 and 37, the pinions 36, 35 and 34, and the tooth portion 33a, and is connected to the connecting holes 33b and 33b on the lens side. The lens shutter operating ring is driven through 122 and 122 (FIG. 10).
Further, when tilting up and down, the slide member 41 is inclined with respect to the plane orthogonal to the lens optical axis A, but the universal joints 26 and 39 can absorb the inclination and transmit the rotation.
[0032]
In the above embodiment, only vertical shift and tilt are possible. However, since the camera 100 to which this shift / tilt adapter is attached is a revolving back system, the camera 100 itself is moved around the lens optical axis A by 90 degrees. By rotating the angle, it is possible to easily shift and tilt in the left-right direction.
[0033]
In the above embodiment, the maximum shooting distance is limited when a normal lens is used, but a specific lens with a long flange back is prepared, and the normal distance between the mounts of the shift / tilt adapter is fixed. If an intermediate ring of equal length is prepared, it is possible to shoot up to infinity even when tilting, or to further increase the shift amount and tilt amount.
[0034]
【The invention's effect】
As described above, the shift / tilt adapter according to the present invention can obtain the following effects.
In the invention according to claim 1, the rotation transmission means for transmitting the rotation of the camera side rotation member to the lens side rotation member is a pair of universal joints interlocking with both rotation members, and a slide member connecting the pair of universal joints. Since this slide member is provided on a surface substantially orthogonal to the optical axis of the photographing lens, the length in the optical axis direction can be made extremely short, and the longest photographing distance does not interfere with actual photographing. Can be within the range.
[0035]
In the above-mentioned shift / tilt adapter, if the camera side member is composed of a substrate mounted on the camera mount and a shift plate slidable on the substrate, the substrate is firmly fixed to the camera side. Therefore, it is possible to stably shift a heavy photographic lens.
[0036]
Further, in the above-described shift / tilt adapter, when the lens side member is mounted on the shift plate so as to be tiltable, the strength of the lens side member mounted on the stable shift plate is increased in the tilt state, so that the photographing lens can be used in any tilt state. Can be securely held.
[0037]
Furthermore, in the above-mentioned shift / tilt adapter, when the lens side member and the shift plate are connected by a bellows, the external light entering the inside can be completely blocked and the internal mechanism can be made invisible. When the information transmission contacts provided on the respective mount portions of the side member and the lens side member are connected by the flexible printed circuit board, reliable connection in any tilt state is possible with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a rear view showing an inner surface side of a camera side member in an unshifted state according to an embodiment of the present invention.
FIG. 2 is a front view showing the outer surface side of the camera side member.
FIG. 3 is a rear view showing the inner surface side of the lens side member.
FIG. 4 is a front view showing the outer surface side of the lens side member.
FIG. 5 is a side sectional view showing a non-shift state when the camera side member and the lens side member are assembled together.
FIG. 6 is a rear view showing the inner surface side of the camera side member in an upwardly shifted state.
FIG. 7 is a side sectional view showing an upward shift state when the camera side member and the lens side member are assembled together.
FIG. 8 is a side cross-sectional view showing the same state during upward shift and upward tilt.
FIG. 9 is a side cross-sectional view showing the same state during upward shift and downward tilt.
FIG. 10 is a perspective view showing a schematic configuration of a camera that should carry out the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10: Camera side member 11,31: Mount part 12: Board | substrate 13: Shift board 14: Lock ring 15,33: Interlocking ring 15a, 33a: Tooth part 16: Connection pin 18, 32: Information transmission contact 21,22,23 , 34, 35, 36: pinions 24, 25, 37, 38: bevel gears 26, 39: universal joint 27: connecting shaft 30: lens side member 40: connecting sleeve 41: slide member 51: flexible printed circuit board 52: bellows A : Lens optical axis B: Center axis of screen

Claims (5)

A camera side member that can be mounted on the mount part of a camera with interchangeable lens, a lens side member that can be attached to and removed from the camera side member so that it can be shifted and tilted, and a camera side rotating member that rotates the lens side. A shift / tilt adapter having a rotation transmission means for transmitting to a member,
The rotation transmitting means is provided on the camera side member and the lens side member, and is coupled to the camera side rotation member and the lens side rotation member, respectively. A shift / tilt adapter comprising: a slide member slidably coupled to the lens; and the slide member provided on a surface substantially orthogonal to the optical axis of the photographing lens. 2. The shift / tilt adapter according to claim 1, wherein the camera side member comprises a substrate mounted on a mount portion of the camera and a shift plate slidable on the substrate by a predetermined distance. The shift / tilt adapter according to claim 2, wherein the lens side member is mounted on the shift plate so as to be tiltable at a predetermined angle. 4. The shift / tilt adapter according to claim 3, wherein the lens side member and the shift plate are connected by a bellows. The shift / tilt adapter according to any one of claims 1 to 4, wherein the information transmission contact provided on each mount portion of the camera side member and the lens side member is connected by a flexible printed circuit board.

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