JPH0728138A - Focusing device of camera - Google Patents

Abstract

PURPOSE:To provide a focusing device for camera with which focusing over the whole picture field of an object photographed can be made smoothly and quickly, which enables fine focusing, and which offers convenience for carrying, by introducing such a construction that a magnifier moving frame is mounted rotatably on a reticle frame. CONSTITUTION:On a reticle frame 1 a magnifier moving frame 3 is mounted rotatably and removably. Left-right moving shafts 7 are parallel installed above and below within the frame 3, and a left-right movement base board 8 is mounted on each of these shafts 7. The upper and lower boards 8 can slide with the shafts 7 as guide. Two vertical movement shafts 12 are parallel furnished between the upper and lower boards 8, and a magnifier 13 is mounted on these vertical movement shafts 12. The magnifier 13 can slide with the shafts 12 as a guide. This permits performing the focusing operation smoothly and quickly by the use of magnifier.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera for positioning a magnifying glass on a focusing plate surface of a focusing plate frame of a large-sized camera or a medium-sized camera to focus an object image projected on the focusing plate surface. Focusing device.

[0002]

2. Description of the Related Art Conventionally, for example, when photographing with a large-sized camera, when photographing a group of people, photographing a landscape, etc., a focusing plate frame with a focusing screen is set in a horizontal position shooting direction or a vertical position shooting direction, and a composition is taken while looking at the focusing screen. After determining, the focus of the subject image (focus)
To match.

[0003]

Focusing is performed by using a loupe, and the loupe is held by the thumb and forefinger while focusing at several points while viewing the image.
Therefore, one hand holds the magnifying glass, and the other hand operates the camera mechanism to perform focusing, which makes it difficult to focus and repeats several times. And it is difficult to do it quickly.

After the focusing is completed, the loupe must be placed somewhere when the cut film holder for photographing is loaded, and the loupe with a string is hung on the neck or a saucer is attached to a part of the tripod. It is either provided or put in a pocket.

In order to fix the loupe on the focusing screen, for example, as shown in FIG. 6, a loupe box B equipped with a mirror A is manufactured, and the entire screen projected on the focusing screen D is displayed on the loupe box B. You must wear Loupe C as you can see.

For this reason, the magnifying glass C having a low magnification is used, so that fine focusing becomes difficult. In particular, the peripheral portion of the focusing screen becomes unclear, focusing is difficult, and the volume is large due to the box shape, which is inconvenient to carry when shooting outdoors.

Further, a bag F is attached to a focusing screen frame E as shown in FIG.
If the magnifying glass C is attached to the bag F and the magnifying glass C having a high magnification is attached to the bag F, the magnifying power is increased and the magnifying glass C can be freely moved.
However, since the bag F covers the top of the focusing screen D, the entire screen of the focusing screen D cannot be seen except the loupe field of view. Besides, it is inconvenient because it is necessary to find a necessary focusing position. In addition, there is an inconvenience that the loupe cannot be placed on the image surface.

The present invention has been devised in view of the above, and it is possible to focus the entire screen of a subject with a magnifying glass. Further, the focusing operation is performed smoothly and quickly, and further fine focusing is possible. It is therefore an object of the present invention to provide a camera focusing device which is convenient for portability.

[0009]

In order to achieve the above object, the structure of the present invention has the following structure. That is, claim 1
Attaches a loupe moving frame to the focusing plate frame that holds the focusing screen rotatably, and arranges the left and right moving axes in parallel in the upper and lower parts of the loupe moving frame. The left and right moving substrates that slide are provided respectively, and the two vertical moving shafts are arranged in parallel between the upper and lower left and right moving substrates.
It is characterized in that it is equipped with a loupe that slides along the vertical movement axis of the book.

According to a second aspect of the present invention, in the loupe moving frame, opening and closing shaft pins are provided in the upper and lower shaft holes formed in the focusing screen frame side, at least one of which is provided on the loupe moving frame side so as to be retractable via a spring. Then, it is attached to the focusing screen frame in a rotatable and detachable manner.

According to a third aspect of the present invention, in the loupe, the front lens barrel, the rear lens barrel, the helicoid, and the loupe body are detachably screwed, and slide guide grooves are formed on the left and right between the lens barrels. A push pin for pressing the vertical movement shaft via a spring is provided in the.

In the fourth aspect, the upper and lower left and right moving substrates are provided with slide guide holes through which the left and right moving shafts penetrate, and are provided with push pins for pressing the left and right moving shafts via springs.

According to a fifth aspect of the present invention, a plurality of left and right moving substrates are arranged side by side on the upper and lower left and right moving shafts, and two vertical moving shafts are arranged in parallel between the corresponding upper and lower left and right moving substrates. A magnifying glass that slides along the vertical movement axis of the book is attached.

[0014]

With the above construction, the loupe can be moved up and down until it contacts the upper and lower left and right moving substrates by using the two parallel vertical moving shafts as guides.

On the other hand, the upper and lower left and right moving substrates having the two upper and lower moving shafts on which the loupe is mounted can also be moved left and right until the inner and outer walls of the loupe moving frame come into contact with the upper and lower left and right moving shafts as a guide. . Therefore, within the loupe movement frame, the loupe can be freely slid and moved, and the loupe can be freely moved in the left and right and up and down directions at the same time while viewing the entire screen of the subject image projected on the focusing screen to perform the focusing operation by the loupe. Be seen. Then, the operation is performed smoothly and quickly.

Further, by pressing the vertical movement shaft with a push pin provided on one of the lens barrels via a spring, the loupe can be moved to a desired position of the subject image and can be left stationary.

Therefore, it is no longer necessary to support the loupe by hand, and even if the loupe is released, the loupe is allowed to stand still, and camera function operations such as focusing and tilting operations with both hands are performed more smoothly and quickly.

Of course, if the left and right moving shaft is pressed by the push pin provided on the left and right moving substrate via the spring,
Whether the focusing screen frame is positioned in the horizontal position shooting direction or in the vertical position shooting direction, the loupe can be left stationary at a desired position, and the focusing operation can be performed more smoothly and quickly.

Since the loupe moving frame is attached to the focusing screen frame so as to be openable and closable, it is possible to see the entire subject image of the focusing screen without obstacles with the loupe moving frame open.
Composition is easy.

After the composition is finished, the loupe moving frame is closed, and the loupe can be moved to the position of the subject image where the user wants to focus while looking at the entire subject image, and the focusing operation can be performed.

Further, by attaching and detaching the screw between the front lens barrel and the rear lens barrel, the loupe can be easily attached to or detached from the two vertical moving shafts. Therefore, the loupe having a desired magnification can be attached. It becomes free, and fine focusing with a magnifying glass of high magnification becomes possible. Further, since the loupe is detachable, when the camera body is stored, the loupe moving frame has no protrusion on the moving frame, which makes the loupe compact and convenient for portability.

[0022]

The present invention will be described in detail below with reference to the drawings. 1 and 2 show an embodiment of a focusing device for a camera according to the present invention.

In the figure, reference numeral 1 denotes a focusing screen frame for holding the focusing screen 2, which is mounted on the rear portion of a large-sized camera or a medium-sized camera. The focusing screen frame 1 is mounted on the rear portion of the camera body so that the focusing frame 1 can be changed in the horizontal position shooting direction and the vertical position shooting direction as necessary by a revolving operation.

A loupe moving frame 3 is rotatably and detachably attached to the focusing screen frame 1. That is, the reticle frame 1 side is provided with a shaft hole 4 in the vertical direction, while the loupe moving frame 3 side is provided with, for example, a fixed opening / closing shaft pin 5a in the lower part, and a coiled spring 6 in the upper part. An opening / closing shaft pin 5b is provided so as to be retractable through the opening / closing shaft pin 5a, 5b inserted into the shaft hole 4, respectively, and the loupe moving frame 3 is pivotally and detachably attached to the focusing screen frame 1 to open and close. You can do it.

On the other hand, the loupe moving frame 3 is provided with an engaging claw 21 at its outer open / close end, and the engaging claw 21 is used for the focusing screen frame 1.
It can be closed by engaging with the protruding claw receiver 22 provided on the side.

Left and right moving shafts 7 are arranged in parallel at the upper and lower sides of the loupe moving frame 3, and a left and right moving substrate 8 is mounted on the upper and lower left and right moving shafts 7. The upper and lower left and right moving substrates 8 can be slid by using the left and right moving shafts 7 as guides.

As shown in FIG. 3, the left and right moving substrate 8 is formed with a slide guide hole 9 through which the left and right moving shaft 7 penetrates.
Further, a push pin 11 for pressing the left and right moving shaft 7 via a coil spring 10 is provided so that the push pin 11 can be left stationary at any position.

Two vertical moving shafts 12 are arranged in parallel between the upper and lower horizontal moving substrates 8, and a loupe 13 is attached to the two vertical moving shafts 12. And
The loupe 13 can be slid by using the two vertical movement shafts 12 as guides.

As shown in FIG. 4, in the loupe 13, the front lens barrel 14 and the rear lens barrel 15 are screwed together, and the rear lens barrel 15 is screwed with the loupe body 17 via the diopter correction helicoid 16. , And these are detachably screwed together to form a loupe.

Slide guide grooves 18 are formed on the left and right between the front lens barrel 14 and the rear lens barrel 15 of the loupe 13, and the loupe 13 slides with the two vertical moving shafts 12 as guides. It can be moved.

A push pin 20 is provided on the rear lens barrel 15 via a coiled spring 19, and the push pin 20 pushes the vertical movement shaft 12 so that the loupe 13 can be left stationary at any position. It has become.

The camera focusing device of the present invention has such a structure. The loupe 13 can be moved up and down until it comes in contact with the upper and lower left and right moving substrates 8 while guiding the two parallel up and down moving shafts 12, and also has the two up and down moving shafts 12 on which the loupe 13 is mounted. Up and down left and right moving substrate 8
Can be moved left and right until it contacts the inner wall of the loupe moving frame 3 by using the upper and lower left and right moving shafts 7 as a guide. For this reason, the loupe 13 can freely and freely move in the plane within the loupe moving frame 3 and simultaneously slide freely on the entire surface of the focusing screen 2 in the left and right directions while looking at the entire subject screen of the focusing screen 2. Then, the focusing operation by the loupe 13 is performed.

The coil spring 1 is attached to the rear lens barrel 15.
By the push pin 20 provided through 9, the vertical movement shaft 12
Since it is pressing, the vertical movement shaft 1
By pressing 2, the loupe 13 can be moved to the position of the required subject image and can be left stationary.

Further, since the push pin 11 is provided on the left and right moving substrate 8 via the coiled spring 10, the left and right moving substrate 8 is set at an arbitrary position by pushing the left and right moving shaft 7 with the push pin 11. can do. Therefore, even if the focusing screen frame 1 is positioned in the horizontal position shooting direction or the vertical position shooting direction, the loupe 13 can be left stationary at any desired position.

Therefore, even if the loupe 13 is released, the loupe 13 can be left still on the focusing screen 3, and the camera function operation such as focusing operation and tilting operation and the loading operation of the cut film holder can be immediately performed, and the focus can be achieved. The matching and the subsequent photographing can be performed smoothly and quickly.

Since the front lens barrel 14 and the rear lens barrel 15 can be screwed together, the loupe 13 can be easily attached to or removed from the two vertical moving shafts 12. Therefore, the magnifying glass 13 with a desired magnification can be freely selected, and fine focusing with the magnifying glass 13 with a high magnification becomes possible. Further, since the loupe 13 is detachable, by removing the loupe 13 from the loupe moving frame 3, there is no protrusion in the camera body, and it is easy to store, which is convenient for portability.
Incidentally, since the loupe 13 is detachable, it can be used as the loupe itself.

Further, since the loupe moving frame 3 is detachably attached to the focusing screen frame 1, it is desired to use the hood loupe frame instead of the cloth for covering the camera regardless of outdoor or indoor shooting. In this case, the hood loupe frame can be easily replaced without removing the loupe moving frame 3 from the focusing screen frame 1.

By the way, most of various types of large-sized cameras including a field camera, a compact camera and a view camera are equipped with a hood frame which can be opened and closed with respect to a focusing screen frame. Therefore, if the loupe moving frame 3 of the present invention is manufactured using this hood frame, the loupe moving frame for each model can be easily manufactured at low cost.

FIG. 5 shows another embodiment of the focusing device for a camera according to the present invention. In this embodiment, a plurality of left and right moving substrates 8 (in the figure,
For example, the number is two, but the number may be two or more. ) Are arranged side by side, and two vertical moving shafts 12 are arranged between the corresponding upper and lower horizontal moving substrates 8, and the two vertical moving shafts 12 are arranged.
The loupe 13 is attached to each.

According to this structure, for example, each loupe 13 is moved and left stationary on an image required for shooting a group of people,
If only the eyes are moved to perform focusing, it is not necessary to move the loupe 13 every time focusing is performed on several necessary image planes.

[0041]

As described above, according to the present invention, it is not necessary to consider the installation location of the loupe after focusing.
Since the loupe can be placed on the focusing screen, the camera can be operated with both hands, focusing can be performed smoothly and quickly, and then the cut film holder can be immediately loaded to perform shooting. Become.

Further, even if the loupe is slid to the subject image on the focusing screen and let go, the loupe is left still without any support, so that the focusing operation can be performed forward and backward with one hand.
It can be operated with one hand, and the functions of the large camera body can be fully exerted, and the target full-screen focusing on the focusing screen can be completed quickly.

In particular, even if the lens itself is heavy as in the case of a long-focal large-sized lens, the forward-backward movement can be focused with both hands, so that an extremely fine forward-backward movement operation can be performed and accurate focusing can be performed. it can.

In addition, since the loupe moving frame can be freely attached to and detached from the focusing screen frame, regardless of whether it is shooting outdoors or indoors, in any case, when it is desired to use the hood loupe frame instead of the camera cover cloth. By removing the loupe moving frame from the focusing screen frame, it can be easily replaced with the hood loupe frame.

The present invention has various effects such that the loupe can be attached and detached so as to be excellent in portability.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a focusing device for a camera according to the present invention.

FIG. 2 is a front view of the device of the present invention with the loupe moving frame completely opened.

FIG. 3 is an enlarged front view of the left and right moving substrate portion of the main part of the present invention.

FIG. 4 is an enlarged cross-sectional view of a magnifying glass portion of the present invention.

FIG. 5 is a front view of a loupe moving frame portion of another embodiment of the present invention in a state in which the loupe moving frame is completely opened.

FIG. 6 is a side view of a camera focusing device previously considered by the present inventor.

FIG. 7 is a side view of another camera focusing device previously considered by the present inventor.

[Explanation of symbols]

 1 Focus Plate Frame 2 Focus Plate 3 Loupe Moving Frame 4 Shaft Holes 5a, 5b Opening / Closing Pins 6, 10, 19 Spring 7 Left / Right Moving Shaft 8 Left / Right Moving Board 9 Slide Guide Hole 11, 20 Push Pin 12 Up / Down Moving Shaft 13 Loupe 14 Front lens barrel 15 Rear lens barrel 16 Helicoid 17 Loupe body 18 Slide guide groove

Claims (5)

[Claims] 1. A loupe moving frame is rotatably attached to a focusing plate frame for holding a focusing screen, and left and right moving shafts are arranged in parallel vertically in the loupe moving frame. Provide the left and right moving boards that slide as guides,
A focusing device for a camera, characterized in that two vertical moving shafts are arranged in parallel between the upper and lower horizontal moving substrates, and a loupe that slides along the two vertical moving shafts is mounted. 2. The opening and closing shaft pin, at least one of which is provided on the loupe moving frame side so as to be retractable through a spring, is inserted into the upper and lower shaft holes formed on the focusing plate frame side of the loupe moving frame. The camera focusing device according to claim 1, wherein the focusing device is mounted on a plate frame so as to be rotatable and detachable. 3. A loupe, wherein a front lens barrel, a rear lens barrel, a helicoid and a loupe body are detachably screwed, a slide guide groove is formed on the left and right between the both lens barrels, and one of the lens barrels has a spring. The focusing device for a camera according to claim 1, further comprising a push pin that pushes the vertical movement shaft via the. 4. The upper and lower left and right moving substrates are provided with slide guide holes through which the left and right moving shafts penetrate, and are provided with push pins for pressing the left and right moving shafts via springs. Camera focusing device. 5. A plurality of left and right moving substrates are arranged side by side on the upper and lower left and right moving shafts, and two vertical moving shafts are arranged in parallel between the corresponding upper and lower left and right moving substrates. The focusing device for a camera according to claim 1, wherein a magnifying glass which slides with the movement axis as a guide is attached.