JP2560784Y2 - Lens board - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bellows type large camera which can be replaced with various lenses including a lens shutter and absorbs a difference in shape between a bellows opening and a desired lens. The present invention relates to a lens board capable of mounting a lens.

[0002]

2. Description of the Related Art A bellows type large camera such as a view camera or a field camera has a mechanism that allows various lenses to be mounted in order to adapt to various environments related to a subject and photographing.

FIG. 5 is a diagram showing a configuration example of a conventional field camera. In the drawing, a body rear portion 52 is erected at one end of a bed 51 via a tilting mechanism, and guide rails for focus adjustment are laid in parallel on an upper surface of the bed 51, and these guide rails are provided with the rails. Is loosely fitted to the extent that the body front part 53 can move freely. In the body rear portion 52, a film portion is formed at a predetermined point in parallel with the opening surface opposite to the body front portion 53, and a bellows 54 is inserted into the opening provided in the film portion from the opening surface described above. Is done. On one opening surface of the bellows 54, a bellows rear mounting plate 55 for engaging the shape of the surface with the above-mentioned film portion is provided, and on the other opening surface of the bellows 54, the shape of the surface and the front portion of the body are provided. A bellows front mounting plate 56 for engaging with the bellows 53 is provided. The bellows 54 is integrated with the body rear portion 52 by engaging the bellows rear mounting plate 55 with the outer periphery of the above-described film portion. On the other hand, an opening communicating with a surface opposite to that of the body front portion 53 is provided on a surface of the body front portion 53 facing the body rear portion 52, and bellows front mounting brackets 57 ₁ and 57 ₂ are provided on the outer periphery of the opening. Is done. The bellows 54 is integrated with the body front 53 by fitting the bellows front mounting plate 56 with the bellows front mounting brackets 57 ₁ and 57 ₂ . Lens board mounting brackets 58 ₁ and 58 ₂ are arranged on the outer periphery of the opening on the surface of the body front portion 53 where the opening that forms the pair with the above-described opening is formed. The concave lens board 60 in which the lens 59 including the lens shutter is inserted,
By being fitted to the lens board mounting brackets 58 ₁ , 58 ₂ , it is mounted on the front part 53 of the body.

When a wide-angle lens is mounted on a field camera having such a configuration for photographing, the distance between the lens of the concave lens board 60 and the above-mentioned film portion is adjusted to a small value according to the focal length. In this state, if necessary, the angle of intersection between the optical axis of the lens and the center of the body rear portion 52 (film portion) is intentionally shifted from a standard right angle (including shift, rise, fall, tilt, and swing). Is performed. The concave lens board 60 is
In such an operation, the bellows 54 is devised to secure a distance between the body rear portion 52 and the body front portion 53 so that the bellows 54 can smoothly follow the bellows 54, and has a pan bottom shape formed by sheet metal or other processing. (Wide angle) lens 59 on the bottom
It is used with attached.

[0005]

In such a conventional concave lens board 60, a mounting hole for a shutter for a lens shutter, which is integrated with a wide-angle lens and disposed on a side surface thereof, an operation section for adjusting an aperture, and a scale are provided. , A sync terminal, a shutter speed adjusting operation unit, a scale, and a set lever are inserted into the concave portion of the concave lens board 60.

Therefore, the operator has to perform the mounting of the release, the connection with the flash, and the above-described adjustment and operation from a direction parallel to the optical axis of the lens (front direction of the camera). However, in practice, it is difficult to read the value of each of the above-mentioned scales from such a direction, so that the efficiency and reliability of photographing have been significantly impaired. Further, such a problem is particularly remarkable when photographing at a low angle.For example, the operator operates the set lever using a little finger or a tool with a sharp tip or uses a bracket with a bent tip for the release. It had to be used additionally.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens board which enhances operability of photographing using a lens having a short focal length.

[0008]

FIG. 1 is a view showing a first embodiment of the present invention. The present invention engages with a bellows which is optically shielded from the outside and forms a cavity leading to a film portion. A flat lens mount formed by providing a plate-like body with an engagement portion and an insertion portion for inserting and supporting a desired lens that forms an optical path from the subject to the film portion at an opening of the cavity, and a film; A plate is provided upright on the track that sets the relative distance to the part and has an external shape that fits into the front part of the body that is linked to the film and sets the tilt. It is characterized by comprising a formed auxiliary plate, and a support column for supporting the flat lens mount and the auxiliary plate so as to be opposed in parallel at a predetermined interval.

[0009]

The lens board according to the present invention is mounted on a camera by first inserting a desired lens into a flat lens mount at the time of photographing, and fitting an auxiliary plate to a front portion of the body. The position of the lens relative to the film is determined by moving the front of the body along the track.If the focal length of the lens is short, shooting is performed with the flat lens mount fixed at a position close to the film. Will be

[0010] Further, as the lens, a lens shutter and other elements integrated with an operation / display unit are used, but in a space sandwiched between the flat lens mount and the auxiliary plate,
There are no other members around the lens other than the support columns that hinder such operations and display reading.

Therefore, when performing photographing using a lens having a short focal length, the above-described operation and display can be more easily performed by the operator's bare hands and naked eyes as compared with a conventional example in which the lens is mounted on a camera via a concave lens board. It is possible to do.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of the present invention.

In the figure, components having the same functions and configurations as those shown in FIG. 5 are denoted by the same reference numerals, and description thereof is omitted here. In this embodiment, the feature of the present invention is that the bellows front screw mount 11 is mounted along the outer periphery of the opening surface of the bellows front mounting plate 56, and the bellows front screw mount 11 is screwed to the bellows front screw mount 11, and Lens board 1 fitted to front mounting brackets 57 ₁ and 57 ₂
2 is provided in place of the concave lens board 60.

FIG. 2 is a perspective view of a lens board according to the present embodiment. In the figure, a lens board 12 has a screw mount 21 that is screwed to the bellows front screw mount 11.
In addition, an insertion hole for the lens 59 is formed, and a flat lens mount 22 having a flat plate shape and a hole corresponding to the insertion hole are formed, so that the bellows front mounting bracket 57 ₁ replaces the bellows front mounting plate 56. , 57 and _second auxiliary plate 23 to be fitted to, inserted hole and bellows front mounting plate 56 with the aperture center are four of the flat lens mount 22 in a state of parallel supports the auxiliary plate 23 matching the above It is composed of columns 24 _{1 to} 24 ₄ . In addition, between the bellows front screw mount 11 and the bellows front mounting plate 56 and between the screw mount 21 and the flat lens mount 22 are connected by screws, and between the flat lens mount 22 and the auxiliary plate 23. It is screwed by a male screw formed separately formed internal thread and both ends of the post 24 _{1-24 4} thereto.

The operation of this embodiment will be described below with reference to FIGS. The procedure for taking a picture using the lens board 12 is as follows. First, the bellows front mounting plate 56 and the bellows 54 are inserted from the rear of the body rear portion 52, and the bellows rear mounting plate 55 is fitted to the film portion. A bellows 54 is attached to the rear part 52 of the body. Second, the lens 59 is inserted into the insertion hole of the flat lens mount 22, and the screw mount 21 is screwed to the bellows front screw mount 11. Here, the screwing means that the gap between the screwing portions of these screw mounts is sufficiently small, and the screwing is loosely screwed several times so that the cavity formed in the bellows is optically isolated from the outside. That means. Third, the field camera is fitted by fitting the auxiliary plate 23 to the bellows front fittings 57 ₁ , 57 ₂ and connecting the body rear 52 and the body front 53 via the bellows 54 and the lens board 12. assemble. Note that various lenses can be selected as the lens 59 based on shooting conditions, but a wide-angle lens having a small focal length will be used below.

The field camera thus assembled is fixed to face the subject and is used for photographing.
In the operation performed at the time of photographing, first, the position of the front portion 53 of the body is changed along the guide rail laid on the bed 51 so that the distance between the film portion in the rear portion 52 of the body and the lens 59 is increased. Is set to a value suitable for the focal length of. The distance set in this manner becomes smaller as the focal length of the lens 59 becomes shorter.

In the process of setting the tilt to set the angle of the film portion with respect to the subject to a desired value, as described above, the shorter the distance between the film portion and the lens 59 is,
The greater the vertical and horizontal movement distances due to the swing and tilt angles and shifts associated with the tilt, the greater the bending and twisting of the cavity leading to the film portion, and thus a local tension is generated in the bellows 54. Therefore, in the conventional example, even if a bag bellows capable of responding to such tension more flexibly than a normal bellows is used as the bellows 54, a desired tilt may be obtained depending on a combination of the distance, the inclination angle, and the moving distance described above. Could not be set.

However, the lens board 12 is rotatable with respect to the bellows 54 within a range in which the threaded state between the bellows front screw mount 11 and the screw mount 21 can be maintained, and is formed in the bellows 54. In the cavity formed, a margin corresponding to the concave portion of the concave lens board 60 is provided in the depth as compared with the conventional example, so that the above-mentioned swing is increased in flexibility and the above-mentioned restriction at the time of setting is reduced. .

The lens 59 is a flat lens mount 22.
The shutter 59 has a mounting hole for the lens shutter release provided on the side surface of the lens 59, a synchro terminal, an operation unit and scale for adjusting the aperture, an operation unit and scale for setting the shutter speed, and a set lever. It is arranged in a space between the lens mount 22 and the auxiliary plate 23. In such a space, around the operating portion of the lens 59, members that interfere with reading operations and scale as in the recessed portion of the concave lens board 60, post 24 _1-24
Not placed except for ₄ . Therefore, the values indicated by the scales of the aperture and the shutter speed can be confirmed from the side surface of the lens 59, and the lens 59 can be mounted in the same manner as the release, the insertion of the cord into the synchro terminal, the adjustment of the aperture and the shutter speed, and the operation of the set lever. This can be easily performed from the side surface.
In particular, with regard to the release, it is not necessary to use a bend release with a bent front end portion, and it is also possible to directly attach a release having a long stroke of the insertion port.

Further, the flat lens mount 2 is attached to the auxiliary plate 23.
The diameter of the hole formed corresponding to the insertion hole of _{No. 2 is}
24 ₄ length, thickness of the auxiliary plate 23, is determined based on the focal length and the image distance of the lens 59 (the distance from the rear principal point to the film portion of the lens 59), constrained to other imaging range of the object Is set to a value as large as possible so as to prevent the occurrence of.

As described above, according to the present embodiment, release of the release, connection with the flash, adjustment of the aperture and shutter speed, and reduction of the restriction on the setting range of the tilt in photographing using the wide-angle lens having a short focal length can be performed. It is possible to easily operate the set lever.

In this embodiment, the field camera is assembled by integrating the bellows 54 and the body front part 53 via the lens board 12, but the present invention is limited to such an assembling method. However, for example, when photographing is performed using a lens having a large focal length, the bellows front mounting plate 56 is attached to the bellows front mounting brackets 57 ₁ , 5
7 ₂ fitted, and by causing fitting the lens board 12 fitted with desired lens in the lens board mounting bracket 58 _1, 58 ₂ as indicated by a dotted line in FIG. 1, the conventional example using a concave lens board 60 It is also possible to assemble a camera and take a picture in the same manner as described above.

Further, in this embodiment, in order to make it possible to similarly assemble a plurality of cameras of different manufacturers, for example, the camera conforms to the Linhof lens board standard adopted by many manufacturers. The flat lens mount 22 is manufactured based on the specifications, and the lens board mounting bracket 58 is manufactured.
The fitting conditions with ₁ and 58 ₂ can be matched.

FIG. 3 is a diagram showing a second embodiment of the present invention. In this embodiment, the present invention is applied to a monorail type view camera, and those having the same functions and configurations as those shown in FIG. 1 and FIG. Description is omitted.

In the camera having such a configuration, the bellows 30 is provided in place of the bellows 54, and a bellows front mounting plate 31 is provided at one end of the camera instead of the bellows front mounting plate 56. Such a mounting plate is generally larger in physical size than the bellows front mounting plate 56 used in combination with the bellows 54 used in the field camera. However, since there are no protrusions or other obstacles on the surface screwed to the flat lens mount 22, by using the flat lens board 32 provided by the manufacturer of the view camera instead of the auxiliary plate 23, The present invention is applied similarly to the embodiment shown in FIGS.

Further, by providing the bellows front mounting plate 31 with an adapter mechanism that can be fitted to the above-described lens board of the Linhof lens board standard, the flat lens mount 22 can be mounted on a plurality of types of cameras conforming to such a standard.
Can be used in combination, so that it is not necessary to easily use a plurality of lenses having the same focal length exclusively for each type of camera.

FIG. 4 is a diagram showing a third embodiment of the present invention. In this embodiment, the present invention is applied to a reflex camera using a mirror, and the same reference numerals are given to those having the same functions and configurations as those shown in FIGS. Then, the description is omitted.

In the conventional reflex camera shown in FIG.
Between the body rear portion 52 and the body front portion 53, a mirror 41 that reflects light received from the subject side toward the finder side and that can change the angle of the reflection is disposed. Bellows 5 at an avoidable point
One end of the bellows 4 is fixed, and a body front part 53 in which a lens 59 is inserted is arranged at the other end of the bellows.

However, in the reflex camera having such a configuration, since the distance between the rear part 52 of the body and the front part 53 of the body is short, the setting range of the tilt performed by operating the front part 53 of the body is not sufficient. .

The reflex camera shown in (b) is an application of the present invention. Since the lens board 12 according to the present invention is disposed instead of the body front portion 53, the camera also serves as the auxiliary plate 23 of the lens board. The position of the front part of the body is located at a point farther away from the rear part 52 of the body than in the above-described conventional example, even if the position of the lens 59 relative to the rear part 52 of the body is the same.

Therefore, according to the present embodiment, the variable range of the tilt is expanded, and a medium-sized camera capable of setting a sufficient tilt at the time of photographing as compared with the conventional example is realized. In each of the embodiments described above, a bag bellows is employed.
The present invention is not limited to such bellows, and a folded bellows may be used as long as the restriction on the setting range of the tilt can be kept within a desired allowable limit.

In the first and second embodiments described above, the bellows front screw mount 11 and the screw mount 21
Through the bellows front mounting plate 56 and the flat lens mount 2
However, the present invention is not limited to such a method. For example, when restrictions on the setting range of the tilt are allowed, the two are joined by screws or integrally formed. A method may be adopted.

Furthermore, such a method, a flat lens mount 22 to post 24 _{1, 24} 2, 24 _3, 24 _4, post 24 _1,
24 _2, 24 _3, it can be similarly applied to each coupling portion of 24 ₄ to the auxiliary plate 23.

In each of the above-described embodiments, the flat lens mount 22 and the auxiliary plate 23 are formed by performing a predetermined processing on a flat plate-shaped body. Not limited to this, provided that a sufficient space is secured between the two members so that operations and display related to the lens can be easily performed by the photographer's bare hands and naked eyes, and that a desired lens mounting portion can be provided. For example, a non-flat member may be used.

[0035]

As described above, in the present invention, an auxiliary plate which is supported in parallel via a support is provided on a flat lens mount of a flat body into which a lens is inserted, and the auxiliary plate is necessary for photographing. A hole that forms an appropriate optical path is formed so that the hole can be fitted to the front of the body.

That is, in the space formed between the flat lens mount and the auxiliary plate via the support, there is a member which hinders operation performed on the operation / display unit integrated with the lens and reading of display. Since there is no other than the support, when the relative position of the lens with respect to the film portion adjusted at the time of shooting according to the focal length of the lens is small, the above-described operation and display confirmation can be easily performed by the operator's bare hands and naked eyes Becomes possible.

Therefore, in photographing using a wide-angle lens having a short focal length, operability is improved and photographing efficiency is improved as compared with the conventional example using a concave lens board.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a lens board according to the present embodiment.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram illustrating a configuration example of a conventional field camera.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Bellows front screw mount 12 Lens board 21 Screw mount 22 Flat lens mount 23 Auxiliary plate 24 Prop 30, 54 Bellows 31 Bellows front mounting plate 32 Flat lens board 41 Mirror 51 Bed 52 Body rear 53 Body front 55 Bellows rear mounting Plate 56 Bellows front mounting plate 57 Bellows front mounting bracket 58 Lens board mounting bracket 59 Lens 60 Concave lens board

Claims (1)

(57) [Scope of request for utility model registration] 1. An engaging portion which is optically shielded from the outside and engages with a bellows forming a cavity reaching a film portion, and a desired lens which forms an optical path from a subject to the film portion at an opening of the cavity. A flat lens mount formed by providing an insertion portion to be inserted and supported on a plate-shaped body, and standing on a track for setting a relative distance to the film portion, and in cooperation with the film portion An auxiliary plate formed by providing a hole for securing the optical path in a plate-like body having an outer shape that fits into the front part of the body for performing the tilt setting, and the flat lens mount and the auxiliary plate are parallel at a predetermined interval. And a support for supporting the lens board so as to face the lens board.