JPS6114007Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an optical lens barrel for tilt-and-focus photography that expands the scope of tilt-and-focus photography in a single-lens reflex camera and allows tilt-and-focus photography to be performed easily.

In particular, the present invention provides an optical lens barrel suitable for use as a photographing lens, an interchangeable lens, or an intermediate tube (adapter) that can optionally perform both or one of shift and tilt movements. For tilt-shift photography, as seen in large bellows-type cameras, shift tilt moves the optical axis of the lens vertically or horizontally in a plane perpendicular to the film surface, and shift tilt allows you to move the lens optical axis in parallel in the vertical or horizontal direction. There is a tilt tilt system that tilts the optical axis relative to the film surface at the center. These are tilt photography techniques in which the optical axis of the photographic lens is artificially moved relative to the film surface, but in contrast to this, the film surface is moved parallel or tilted vertically and horizontally relative to the optical axis. It is also known that there are means for shifting and tilting the film plane to produce a tilting effect. This shift/tilt tilting of the film surface is effective for correcting distortions in perspective depiction that occur when shooting from an overhead perspective, but as tilting devices become larger, simplified tilting and tilting techniques are needed. Device,
Especially for single-lens reflex cameras,
This is often omitted, and lens-side shift and tilt tilt have come to play a central role in tilt-shift photography.

As a method for making this lens optical axis shift and tilt tilt possible, single-lens reflex cameras employ a method in which a bellows photographing device equipped with a tilt device is removably disposed between the camera body and the photographing lens. However, conventional bellows photography devices are generally quite large, making it very inconvenient to carry and turn the camera around when taking pictures, and the greatest advantage of a single-lens reflex camera is its mobility. It is a loss. On the other hand, there is also a method of using an interchangeable lens that allows tilt and tilt photography by incorporating a shift and tilt tilt mechanism into the lens structure. However, in this case, since the photographic lens is built into the body, it is not possible to replace only the lens part, and when performing tilt-and-shoot photography using several different lenses, each lens must have its own tilt-and-shift position within the body. This comes with the inconvenience of having to prepare lenses equipped with a mechanism. Additionally, this type of lens is generally expensive.

In view of the above circumstances, the purpose of this invention is to provide a single-lens reflex camera that is easy to operate without impairing its mobility, can be used with multiple interchangeable lenses, and is relatively easy to operate. The purpose is to provide an inexpensive tilt photographing device.

Figures 1 and 2 show embodiments of the present invention;
The figure is an exploded plan view showing the configuration, and FIG. 2 is a plan view showing the operating state. In the figure, 1 is the camera body, and the lens mount part 2 is used to directly attach the photographic lens during normal shooting.
have. 3 is a helicoid unit;
At one end, it has a mounting part (a tightening ring in this example) 4 for detachably attaching it to the mount part 2 of the camera, and at the other end, it has a lens mount part 5 similar to the camera 1. 6 is a distance ring for adjusting the amount of helicoid payout. Reference numeral 7 is a unit for tilt-and-shoot photography according to the present invention, which has a mounting section 8 similar to 4 above and a substrate 9 fixedly attached to the structure of the mounting section 8 or rotatably about the optical axis. The base plate 9 has an arm 9a protruding from the disc-shaped main body and a left end 1 of the next shift seat 10.
It has a dovetail portion 9b that slides parallel to the film surface via the dovetail groove fitting mechanism. By arm 9a,
A male screw 12 that engages with a female screw 11 fixed to a shift seat 10 and a shift knob 13 coaxially fixed to the male screw 12 are supported. By rotating this shift knob 13 in the direction of arrow A, the male screw 12 and the female screw 1
1, the shift seat 10 moves parallel to the film surface with respect to the substrate 9 via the dovetail groove fitting mechanisms 9b and 10b (arrow B in FIG. 2).

Reference numeral 15 denotes an R-seat member having a curved surface with a radius R centered on an arbitrary point on the optical axis in a general photographing state (the state shown in FIG. 1) at its front end. A tilt seat 16 is disposed in front of the tail seat 16, which has a curved surface having the same curvature as this curved surface at its rear end. Here, the axial cross-sectional shapes of 15 and 16 are rectangular, and it is a matter of course that both have light passage openings inside. An internal gear 1 is attached to the curved surface of the tail seat 16 by a screw 17 inside.
8 is fixed, and furthermore, a pinion 19 attached to the R seat 15 is engaged with this internal gear 18. A tail knob 20 is attached coaxially with the pinion 19, and if this knob 20 is rotated as shown by arrow C, the pinion 19 and internal gear 18
Due to the action of the tail seat 16, the tail seat 16 is moved along the curved surface portion of the radius R, and the rail mechanism 15 provided on the sliding portion
With the guidance of a and 16a, move to R seat 15 as indicated by arrow D.
Perform a tilting motion against.

The rear end of the R seat 15 is fixed to a rectangular flange portion 10a provided at the front end of the shift seat 14 by a screw 14, and a mount portion 21a having the same shape as the mount portions 2 and 5 is provided at the front end of the tail seat 16. A mount member 21 having a rectangular flange portion 21b is fixed with screws 22.
23 is a photographing lens, and the mount part 21a
It has an attachment part 24 that can be attached to. Note 25
indicates the film surface.

As is clear from the above configuration, when performing the shift tilt movement in which the lens optical axis is moved in parallel within a plane perpendicular to the film surface, members 8, 9, 1
By rotating the shift knob 13 of the first unit consisting of components 1, 12, 13, etc. by a predetermined amount, the substrate 9 and the shift seat 10 can be slid. For tilting tilting with respect to the surface, members 15 and 1 are used.
6, 17, 18, 19 etc., the tail knob 20 of the second unit is also rotated by a predetermined amount,
It is sufficient to tilt the lens optical axis between the radius seat 15 and the tail seat 16. It is also possible to shoot with a combination of shift tilt and tilt tilt.

In this embodiment, the distance adjustment helicoid unit 3 is placed between the camera 1 and the intermediate lens barrel 7, but this is based on the assumption that the photographic lens 23 does not have a mechanism for adjusting the distance. This position may be located between the mount member 21 and the photographing lens 23, or may be incorporated into the intermediate lens barrel 7 itself.

Furthermore, the flange portion 10a of the shift seat 10 and the R
The seat 15 is fixed by the screw 14, but by providing a click mechanism in the middle, the combination of the shift direction and the tilt direction (in this example, both left and right directions when viewed from the film surface) can be selectively set. It is also possible to make it possible to do so.

FIG. 3 is a plan view of a case where a compact and simplified bellows device is incorporated into the tail tilting section consisting of the R seat 15 and the tailing seat 16 in FIG. 1, and FIG. 4 shows only this tail tilting section. FIG. The bellows 30 is attached to a front plate 29 having a lens mount portion 29a at its front end and to a rear plate 28 at its rear end, and this rear plate 28 is attached to the shift seat 10 by screws 26 and nuts 27 as in the example of FIG.
It is fixed to the flange portion 10a of. FIG. 5 is also a plan view of the rear plate 28, and the front plate 29 and bellows 30 are shown in broken lines to show the operating state when the tilt tilt is applied. As is clear from FIGS. 4 and 5, the rear plate 28 includes support legs 28a bent in an L-shape and rail holes 2 formed therein.
8b. The front plate 29 also has a rotary leg 29b bent into an L-shape, in which a bearing 32 is embedded. The support leg 28a and the rotary leg 29b are connected via the rail hole 28b by a shaft 31 having a threaded portion at its tip and a tightening knob 33 having a female threaded portion that engages with the shaft 31. If the tightening knob 33 is loosened, the connection between the support leg 28a and the rotating leg 29b becomes loose, and the front plate 29 can rotate about the shaft 31 relative to the rear plate 28. Further, in this state, the shaft 31 can move back and forth along the rail hole 28b, and the interval between the front plate 29 and the rear plate 28 can be arbitrarily selected. That is, it is possible to roughly adjust the amount of lens extension, which is very effective when a large amount of lens extension is required, such as during close-up photography.

If you use the intermediate lens barrel for tilt-and-shoot photography as explained above, you will be able to do tilt-and-shift photography easily and easily, and since it is small and lightweight, it will not impair the mobility of the single-lens reflex camera, and Since the lenses are interchangeable, one adapter can be used for multiple lenses, expanding the range of tilt-and-shoot photography techniques, and has the additional advantage of being relatively inexpensive.

[Brief explanation of the drawing]

Fig. 1 is an exploded plan view showing the configuration of an embodiment of the optical lens barrel for tilt-shift photography according to the present invention, Fig. 2 is a plan view showing its operating state, and Fig. 3 is a small-sized structure in the tilt-shift section. A plan view showing another embodiment incorporating a bellows device, and FIGS. 4 and 5 are a side view and a plan view showing its configuration and operating state. 1... Camera, 3... Helicoid unit, 7
...Optical lens barrel for tilted photography, 8...Mounting section, 9...
... Board, 10... Shift seat, 15... R seat, 16
... Tail seat, 21, 29a ... Lens mounting member, 23 ... Photographic lens, 25 ... Film surface, (28 ... Front plate), 29 ... Rear plate, 30 ... Bellows.

Claims (1)

[Scope of utility model registration request] It has a first unit that performs shift tilt and a second unit that performs tail tilt, and each unit is provided with a first connecting portion that connects both units, and a camera or other device is connected to the other end of both units. What is claimed is: 1. An optical lens barrel having a tilt mechanism, characterized in that a second coupling portion is provided for coupling with a third unit, and by coupling each unit, both or one of shift tilt and tilt tilt can be performed.