JPH0566628U - Lens tilt device - Google Patents

Abstract

(57) [Summary] [Purpose] A standard single-lens reflex camera should be used so that it can be used for shooting. [Structure] An inclined mount that forms an optical axis of an interchangeable lens at a predetermined angle with respect to the body side optical axis is provided on the front surface of a ring member that can be mounted on a body side mount having an optical axis perpendicular to a film surface in a camera body. By providing it, a simple and inexpensive tilting device can be realized. If the optical axis of the interchangeable lens and the optical axis on the body side intersect on the film surface, the image movement due to the lens tilt can be offset. Furthermore, by preparing multiple types of tilt mounts with different tilt angles, most subjects can be handled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tilting photographing by a single-lens reflex camera, and particularly to a lens tilting device that easily assists tilt tilting.

[0002]

[Prior Art]

 In general, the mount on the body side of a single-lens reflex camera has an optical axis perpendicular to the film surface, and the photographing focus plane of the attached interchangeable lens is configured to be parallel to the film surface. .. That is, the optical axis on the lens side and the optical axis on the body side are completely aligned. Therefore, when the subject (for example, the face of a person) is focused, the scenery before and after the subject is defocused and photographed. In normal shooting, such a focus condition is extremely natural and causes no inconvenience.

However, when the subject has a “deep plane” such as a skyscraper, the ground, or a wall, as shown in FIG. 5, the photographing focus plane and the subject plane do not coincide with each other, and both planes intersect. Only the band-shaped area will be clearly photographed. Therefore, when shooting such an object, a method called “orientation shooting” is used to adjust the focus plane and correct the distortion of the subject by tilting or moving the optical axis of the lens system relative to the film surface. Used.

For this tilt shooting, (1) tilting (tilting the lens in the vertical direction) (2) tilting tilting method called swing (tilting the lens in the horizontal direction), and (3) front raising and front There is a parallel tilt method called lowering (sliding the lens in the vertical direction) (4) shifting (sliding the lens in the horizontal direction).

The tilt tilt and the parallel tilt are techniques that should be properly used according to the purpose. Therefore, the camera does not have to have both functions, and the application range is significantly widened when only one of them is used. Among them, the tilted tilt has an excellent feature that it can focus on the tilted surface. Especially, if the tilt angle is set so that the three planes of the subject surface, the lens plate surface, and the film surface intersect on the same line, it is possible to focus on a deep subject surface regardless of the distance, which is very convenient. Is. For this reason, the tilted tilt has a wide range of uses and can be expected to have a special shooting effect.

As the tilting device which has been put into practical use at the present time, (a) a bellows configured so that the photographing lens can be swung / translated in any direction (tilting, swinging, raising / lowering forward, shifting) An assembling dark box with a structured lens barrel, a view camera, etc. (b) A tilting device for 35 mm lenses (N company, P company) that allows the shooting lens to shift an arbitrary amount after rotating it at a desired angle with respect to the body side mount. , M, etc.) (c) 35 mm lens tilting device with a mechanism that allows tilting and shifting in any direction (C company) (d) Tele-converter (optical distance from lens mount to film surface) There is known a tilting device (Company H) in which a concave lens system to be increased) and a special joint capable of tilting at an arbitrary angle are combined. In addition, some large format studio cameras have the effect of tilting by swinging or translating the film surface relative to a fixed lens.

[0007]

[Problems to be solved by the device]

 However, the conventional tilting device described above has various problems that are difficult to apply to the popular 35 mm single-lens reflex camera that is currently in the mainstream. This is mainly because there is a strong awareness that "tilting photography" is a special photography technology that is necessary only for professional photographers, and therefore the device configuration is unnecessarily complicated. That is, since the tilt angle and the amount of parallel movement can be arbitrarily set in an analog manner, the structure is complicated and prone to failure. It is expensive. There is no freedom of choice for general-purpose bodies and interchangeable lenses. There was a drawback.

In recent years, along with the popularization of high-end single-lens reflex cameras and the improvement of camera technology at the mass level, there is an increasing need for amateurs to take full advantage of photography. For this reason, the advent of a simple and inexpensive tilting device that is highly versatile and compatible has been desired. In view of the above points, the present invention aims to provide a simple and inexpensive lens tilting device that enables shooting even with a combination of a commercially available camera body and an interchangeable lens.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the lens tilting device of the present invention has an optical axis of an interchangeable lens on the front surface of a ring member mountable on a body side mount having an optical axis perpendicular to the film surface, with respect to the body side optical axis. The tilting angle is fixed so that tilting angle can be fixed and tilt shooting can be realized with the same simplicity as the intermediate ring. Further, the tilt angle and center position of the tilt mount are set so that the interchangeable lens optical axis and the body side optical axis intersect on the film surface, so that image movement due to tilting can be corrected. is there. Further, the tilt mount is configured to be rotatable about the body side optical axis so that the tilt can be set in an arbitrary direction.

[0010]

【Example】

 Hereinafter, the present invention will be described based on an embodiment shown in the accompanying drawings. FIG. 1 is a cross-sectional view showing the relationship between the lens tilting device of the present application, an interchangeable lens, and a body, FIGS. 2A to 2C are cross-sectional views showing a configuration example of the tilting device with different tilt angles, and FIG. 3 is a tilt mount. 2 is an example of a configuration in which the can be rotated with respect to the body side.

In the figure, reference numeral 1 denotes a ring member which is a base of the lens tilting device 100 of the present application, and the ring member 1 has a mounting surface 10 a of a mount 10 on a camera body 200 side having an optical axis L ₁ perpendicular to a film surface F. It can be attached to. That is, the ring member 1, the locking groove M ₁ of the body-side mount 10 (e.g., a screw groove which is equidistantly formed radially in three directions) lockable claw piece 1a (e.g., equidistantly in three directions comprising a formed protrusion) on the rear surface, and fitting the pawl piece 1a in the mounting groove M ₁ of the mount 10, by tightening by rotating by a predetermined angle degree, so that it locks into position.

Reference numeral 2 denotes an inclined mount formed on the front surface of the ring member 1. The inclined mount 2 has an inclined mounting surface 2a inclined by a tilt angle θ with respect to the mounting surface 10a of the body side mount 10 as a front surface. In preparation for this, the interchangeable lens 20 can be tilted at a predetermined angle. The tilted mounting surface 2a of the tilted mount 2 is configured such that its optical axis (= optical axis L ₂ of the exchange lens 20) intersects the optical axis L _{1 of the} mount 10 on the film surface F. The image movement due to lens tilt can be appropriately compensated. Further, a mounting groove M ₂ similar to the mounting groove M ₁ of the camera body side mount 10 is formed on the inner side surface of the tilt mount 2, and the claw piece 20a on the interchangeable lens 20 side is rotated by a predetermined angle. It can be tightened and locked in place.

Here, it is desirable that the tilt angle θ of the tilt mount 2 (angle formed by the optical axis L ₁ and the optical axis L ₂ ) can be appropriately selected from 3 to 4 steps within a range of 2 to 15 degrees. Therefore, as shown in FIGS. 2A to 2C, for example, prepare the ring member 1 including the tilt mount 2 set at an angle of θ = 2.5 °, 3 °, 4 °, 6 °. For example, it becomes possible to support almost all of the tilt-movement photography that is normally required (if you are proficient in tilt-movement photography, you can determine the tilt-angle selection instantly). It should be noted that the tilting direction of the tilt mount 2 is not limited to the vertical direction (tilting), but may be the horizontal direction (swinging) or the diagonal direction.

Further, when the tilt mount 2 is configured to be rotatable with respect to the ring member 1 by applying a sliding mechanism such as a bearing mechanism B as shown in FIG. 3, a lens in an arbitrary direction can be obtained. Tilt shooting can be realized (not only tilting but also swinging is possible).

In the above embodiment, the ring member 1 which is the base of the tilting device 100 is mounted on the mount surface 10 a of the mount 10 on the camera body 200 side, and the replacement lens 20 is further mounted on the tilted mounting surface of the tilt mount 2. Attach to 2a. At this time, the optical axis L ₂ of the interchangeable lens 20 is tilted by the tilt angle θ with respect to the optical axis L ₁ of the body side mount 10, and both optical axes intersect on the film surface F. Therefore, the taking lens of the interchangeable lens 20 and the film surface F are inclined to each other, and the tilt of the focusing surface and the appropriate movement of the screen due to the tilting effect can be realized.

[0016]

[Effect of the device]

 As described above, in the lens tilting device of the present invention, the optical axis of the interchangeable lens with respect to the body side optical axis is attached to the front surface of the ring member that can be mounted on the body side mount having the optical axis perpendicular to the film surface. Since it is equipped with an inclined mount that can be tilted at a predetermined angle and intersects both optical axes on the film surface, only a very simple member is inserted between the lens and the body. Can be realized.

Further, in the first invention, if the tilt angle and the center position of the tilt mount are set so that the interchangeable lens optical axis and the body side optical axis intersect on the film surface, tilting can be achieved. Image movement can be corrected.

In addition, in the configuration of the first and second inventions, the tilt mount is configured to be rotatable about the body-side optical axis, and tilt tilt in any direction is possible.

As a result, it is possible to obtain a deeper depth of field than under normal shooting even under the same conditions, and it is possible to achieve the excellent effect that the single-lens reflex camera can be made highly functional and multifunctional with a simple configuration. is there.

[Brief description of drawings]

FIG. 1 is a sectional view of a lens tilting device of the present application.

FIG. 2 is a principle configuration diagram of the device of the present application, in which (a), (b),
(C) shows the case where the tilt angle is changed.

FIG. 3 is a cross-sectional view of the device of the present application when the tilt direction of the lens is variable.

FIG. 4 is a sectional view showing a relationship between a conventional lens and a body side mount.

FIG. 5 is a principle explanatory diagram showing a relationship between a focus surface of a normal camera lens and a subject surface.

[Explanation of symbols]

1 ring member (base) 1a claw piece 2 tilted mount 2a tilted mounting surface 10 body side mount 10a mounting surface 20 interchangeable lens 20a claw piece 100 lens tilt device body 200 camera body M ₁ , M ₂ locking groove F film surface L ₁ Optical axis of body side mount Optical axis of L ₂ tilt mount

Claims (3)

[Scope of utility model registration request] 1. An inclined mount that makes an optical axis of an interchangeable lens at a predetermined angle with respect to the body side optical axis is provided on the front surface of a ring member that can be mounted on a body side mount having an optical axis perpendicular to the film surface. A lens tilting device characterized in that 2. The tilt angle and center position of the tilt mount are set so that the interchangeable lens optical axis and the body side optical axis intersect on the film surface.
The lens tilting device described in. 3. The lens tilting device according to claim 1, wherein the tilt mount is configured to be rotatable about the body side optical axis.