JPH0244044B2 - SHASHINSATSUEIYO PINTOGURASUKAMERA - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises an objective lens holder and a focusing glass holder, and the focusing glass holder is held so as to be slidable in the longitudinal direction on a stand, and the focusing glass holder is equipped with a rotating joint and a focusing glass. Via at least one retainer connected to the coupling, the axis of rotation passes through the center point of the focusing glass and is vertical in use, as well as about the horizontal axis of rotation that passes through the central plane of the focusing glass at right angles to the axis of rotation. This invention relates to a rotatable focusing glass camera for photography.

In this type of camera used particularly for professional photography, it is possible to simultaneously form sharp images of various parts of the subject at different distances from the objective lens. Furthermore, by making the lens holder or focusing glass holder rotatable, perspective distortion of the image can be compensated for.

In conventional cameras, the focusing glass holder is connected to an L-shaped arm on one side, and the horizontal axis of rotation passes through the center plane of the focusing glass. However, the holding of such a focusing glass holder is extremely unstable, and the insertion of an oblong negative cassette is only possible from one side.

Of course, focusing glass cameras are well known in which both a vertically long negative cassette and a horizontally long negative cassette can be inserted from both sides of a focusing glass holder. In this type of camera, a rotary sector plate with an imaginary rotation axis is provided below the rotary joint.
However, such cameras have the disadvantage that the horizontal axis of rotation does not pass through the center plane of the focusing glass, especially in the case of large format images.

An object of the present invention is to provide a camera equipped with a horizontal axis of rotation passing through the center plane of the focusing glass, as described at the beginning, so that the focusing glass holder can be easily rotated, regardless of the size of the image. Therefore, the present invention is designed to allow insertion of vertically long and horizontally long negative cassettes from all directions, and to realize this with a structure that saves space and weight.

A specific method of achieving these objects according to the present invention is that the focusing glass holder is provided with one rotary sector plate on each side of the focusing glass holder symmetrically with respect to the vertical axis of rotation and outside the horizontal axis of rotation, and the sector plate is It is supported by a holder with two pillars and configured as a fan-shaped plate with at least two concentric guide surfaces, and the center point of the fan-shaped plate is on the horizontal axis of rotation, and each of the pillars is horizontal. It has three support rollers with axes parallel to the axis of rotation, two of these rollers are in contact with one guide surface, one is in contact with the other concentric guide surface, and the rollers are centered on the horizontal axis of rotation. It is characterized by a stopper for fixing the rotational position of the focusing glass holder, which rotates as it rotates.

According to the present invention, the focus glass holder is held by two pillars, and has a stable structure suitable for heavy, large-sized focus glass holders. On both sides of the focusing glass holder, in a symmetrical position with respect to the vertical axis of rotation of the focusing glass holder, rotating sectors configured as plates are fastened. The fan-shaped configuration of the rotary sector plate creates a free horizontal axis of rotation passing through the central plane of the focusing glass, allowing the negative cassette to be inserted from all directions without hindrance. Furthermore, since the rotating fan-shaped plate is placed on the side,
A significant advantage arises in that focusing glass holders of various sizes can be used, depending on the size of the desired image, without changing the position of the axis of rotation with respect to the plane of symmetry of the image. Therefore, even a large-sized focusing glass holder can be easily and reliably adapted to shooting conditions by using a small and lightweight rotating fan-shaped plate.

Each rotating sector plate is held by only three support rollers,
The structure of the rotating sector plate is simple because it is guided. Two support rollers are in contact with one guide surface, so that the fan-shaped plate can rotate and at the same time perfectly perform static positioning.
On the other hand, a third support roller abuts the other concentric guide surface. In this case, considering the function of the rotating fan-shaped plate, two of the support rollers will contact the guide surface with the smaller radius, and the third support roller will contact the guide surface with the larger radius, or conversely, two of the support rollers will contact the guide surface with the larger radius. It does not matter whether the third roller contacts the guide surface with a large radius and the third roller contacts the guide surface with a small radius. It is advantageous if the focusing glass holder is rotated manually, since a quick and simple adjustment is possible in this way without the use of a transmission. Abandoning such a transmission device by which the focusing glass holder can be fixed in its adjustment position, a stop is provided for fixing the rotational position of the focusing glass holder rotating about a horizontal axis of rotation.

It is advantageous if, for each column, two support rollers abut a large-radius guide surface and the axes of the three support rollers lie approximately on a common straight line. In such a case, the entire three support rollers of the rotating sector plate can be fixed together on one simply shaped column. This allows the support to be of a simple and inexpensive type.

It would be reasonable if the pressing force of the central support roller against the guide surface of each support can be adjusted by eccentrically arranging its axis. In this way, even if there is a large manufacturing margin for the axial position of the support roller,
It is possible to support and guide the rotating sector plate without any play.

Another embodiment provides for the stopper to be configured as a set screw held in a threaded hole in the column at least at right angles to the surface of the rotating sector, the screw passing through a recess in the rotating sector concentric with the guide surface and It is equipped with a stop shoulder for pressing the rotating sector plate against the column. Such a stopper allows easy manual rotation of the focusing glass holder and easy fixation at a desired rotational position.

The invention will be explained in more detail below on the basis of exemplary embodiments illustrated in the drawings.

Each figure shows the following: Figure 1: Side view of a focusing glass camera with objective lens holder and focusing glass holder. Figure 2: Figure 1 with rotating fan plate held on a post.
FIG. 3: Front view of the focusing glass holder of FIG. 1 and the holder connected thereto. FIG. 4: Sectional view of the column of FIG. 2 along line A-A. FIG. , a focusing glass camera for photography equipped with an objective lens holder 1 and a focusing glass holder 2 is shown. The objective lens holder 1 is a holder for the objective lens 3, and on the other hand, a focusing glass 11 is provided inside the focusing glass holder 2.
is retained. The objective lens holder 1 and the focusing glass holder 2 are connected by a bellows 5 that does not transmit light. Both the objective lens holder 1 and the focusing glass holder 2 are held by sliders 6 and 7 so as to be slidable on a bed 8 in the longitudinal direction. The slider 7 is connected via a rotary joint 9 to a holder 10 that supports a rotating fan-shaped plate 4 of the focusing glass holder 2. The rotating sector plate 4 allows the focusing glass holder 2 to be tilted about a horizontal axis of rotation 12 passing through the central plane of the focusing glass 11. Furthermore, the focusing glass holder 2 can rotate around the horizontal rotating shaft 12 and also around the vertical rotating shaft 13 passing through the center point of the focusing glass 11, regardless of the tilted position of the focusing glass holder 2. The vertical rotation axis 13 is the holder 1
0 and is predetermined by the rotary joint 9 connected to the rotary joint 9. Like the focusing glass holder 2, the objective lens holder 1 represented in FIG. 1 is also rotatably mounted.

FIG. 2 is an enlarged view of the focusing glass holder 2 combined with the rotary sector plate 4. As shown in FIG. The rotary sector plate 4 is constructed as a sector plate with concentric guide surfaces 14 and 15 facing towards the front. The guide surfaces 14 and 15 are circular arcs having a common center, the center of which is defined by the horizontal axis of rotation 12.

As you can see from Figure 3, the focus glass holder 2
Two rotary sector plates 4 are provided which are fixed in symmetrical positions with respect to the vertical axis of rotation 13 on the sides of the rotor.
2 and 3, the holder 10 is constructed as a support 16, which, as can be seen in FIGS. 2 and 4, is U-shaped and accommodates support rollers 17, 18, 19. The shafts 17a, 18a, and 19a of the support rollers 17, 18, and 19 are held between two mutually parallel side plates of the support 16, which has a U-shaped cross section.

Support rollers 17, 18, 19 are located on a common straight line 20 running in the longitudinal direction of column 16.

The support rollers 17 and 19 are in contact with the guide surface 14 with a large radius, and the support roller 18 is in contact with the guide surface 15 with a small radius. The central support roller 18 has an eccentric shaft 18a, by which the pressing force against the guide surface 15 can be adjusted.

Focus glass holder 2 with rotating sector plate 4
is the horizontal axis of rotation 1 that passes through the center plane of the focusing glass 11 regardless of the position of the focusing glass holder 2.
It is rotated and tilted around 2. The guide surfaces 14 and 15 are formed by hollowing out the rotary fan-shaped plate 4, so that the ends of the hollowing out correspond to the support rollers 17 and 1.
This also serves as a stopper 9, which limits the maximum angle of inclination of the focusing glass holder 2.

As shown in FIG. 3, a stopper 21 is provided to fix the rotational position of the focusing glass holder 2 when the horizontal rotation axis 12 is stopped. The stopper 21 consists exclusively of a set screw 22, the shank 23 of which is guided through a recess 24 in the rotary sector plate 4. Shaft 23 with threads
meshes with the screw hole 25 of the support column 16. The set screw 22 further includes a stop shoulder 26 for pressing the rotary sector plate 4 against the column 16. Since both sides of the cutout 24 are concentric with the guide surfaces 14 and 15, the focusing glass holder 2 can be fixed in various tilted positions.

[Brief explanation of drawings]

FIG. 1 is a side view of a photographic focusing glass camera equipped with an objective lens holder and a focusing glass holder according to the present invention, and FIG. 2 is a side view of the focusing glass camera of FIG. FIG. 3 is a partially enlarged side view of the glass holder, FIG. 3 is a front view of the focusing glass holder of FIG. be. 1...Objective lens holder, 2...Focusing glass holder, 3...Objective lens, 4...Rotating sector plate, 5...
Bellows, 6, 7...Slider, 8...Bed, 9...Rotary joint, 10...Holder, 11...Pinto glass, 1
2...Horizontal rotation axis, 13...Vertical rotation axis, 14, 15
...Concentric guide surface, 16...Strut, 17, 18, 19
...Support roller, 17a, 18a, 19a...Support roller shaft, 18a...Eccentric shaft, 20...Common straight line, 2
1... Stopper, 22... Set screw, 23... Screw shaft, 24... Hollow out, 25... Screw hole, 26... Stop shoulder.

Claims (1)

[Claims] 1. A focusing glass holder that includes an objective lens holder and a focusing glass holder and is held so as to be able to slide in the longitudinal direction on a stand, and that the holder is connected to a rotating joint and the joint. a photograph which is rotatable through the center point of the focusing glass via at least one holder, about a vertical axis of rotation in the position of use, and about a horizontal axis of rotation passing through the central plane of the focusing glass at right angles to the axis of rotation; In a focusing glass camera for photographing, a focusing glass holder 2 is provided with one rotary sector plate 4 on each side of the horizontal rotation axis 2 on both sides symmetrically with respect to a vertical rotation axis 13, and the rotating sector plate is provided with two supporting columns. 16 and at least two concentric guide surfaces 14,
15, the center point of the sector plate is on the horizontal rotation axis 12,
Each support 16 has an axis 17a parallel to the horizontal rotation axis 12,
three support rollers 17 with 18a, 19a;
18, 19, two of these rollers 1
7 and 19 are in contact with one guide surface 14, and one piece 18
is in contact with the other concentric guide surface 15, and is provided with a stopper 21 for fixing the rotational position of the focusing glass holder 2 rotating about a horizontal rotation axis 12. 2 At each post 16, two support rollers 1
7 and 19 are in contact with the guide surface 14 with the larger radius, and the shafts 17 of the three support rollers 17, 18, 19
2. A focusing glass camera according to claim 1, wherein a, 18a, and 19a are substantially on a common straight line 20. 3. The focusing glass camera according to claim 1 or 2, wherein the pressing force of the central support roller 18 against the guide surface 15 of each support 16 can be adjusted via the eccentric shaft 18a. 4. The stopper 21 is configured as a set screw 22 held in a threaded hole 25 of the column 16 at least at right angles to the surface of the rotating sector plate, which screw is located in the cutout 2 of the rotating sector plate 4 concentric with the guide surfaces 14, 15.
4. A focusing glass camera according to claim 1, further comprising a stop shoulder (26) passing through the rotary sector plate (4) and pressing the rotary sector plate (4) against the column (16). 5. The focusing glass according to claim 1 or 2 or 3 or 4, wherein the central support roller 18 is pressed against the guide surface 15 via a spring supported by the support column 16. camera.