JPH055545Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a camera viewfinder device that is attached to a camera and used to focus the viewfinder image of the camera.

[Prior Art] Large and medium-sized cameras are now equipped with a finder device to more accurately focus the camera. This finder device is equipped with a finder screen for forming an image of the subject at the focal position of the camera, a dark box is installed on top of this finder screen, and the finder image is displayed through an eyepiece provided in the dark box. It is now possible to see it visually. In order to achieve more precise focusing, a magnifying glass is attached to the eyepiece of the dark box, and the magnifying glass can be used to magnify the viewfinder image.

[Problem that the invention aims to solve] By the way, in order to achieve the above-mentioned focusing more accurately, it is necessary to enlarge the viewfinder image as much as possible, but if the magnification of the loupe is increased, the field of view becomes narrower. Unless the size of the finder device is increased, the entirety of the finder image cannot be observed, and focusing is limited to the center of the finder image and its vicinity.

Here, the most accurate focus position of the subject is not necessarily the center of the subject, but may be adjusted to focus near the periphery, or may be focused at multiple locations. Sometimes you have to check to see if they are there. However, as mentioned above, when the magnification of the loupe is increased in order to enable more accurate focusing, it is not possible to focus on the periphery of the viewfinder image. There is a limit to the magnification of a loupe, and it is usually only possible to use a magnification as low as 2x or less, which has the drawback of not being able to focus with extremely high precision.

The present invention was developed in view of the above points, and its purpose is to enable observation of the entire viewfinder image using a high-magnification loupe, and to adjust the focus at any position. An object of the present invention is to provide a camera finder device capable of performing the following operations.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an opening larger than the outer diameter of the loupe in the loupe attachment part of the dark box, and a light-shielding support member that blocks the opening has the above-mentioned opening. The feature is that the magnifying glass is movable within a predetermined range in a direction perpendicular to the optical axis by supporting the magnifying glass and movably attaching the light shielding support member to the magnifying glass attachment part. That is.

[Function] By configuring as described above, the lens barrel of the loupe provided in the loupe mounting portion can be grasped and moved in a direction perpendicular to its optical axis, and the loupe can be moved to the viewfinder screen. can be placed at any position. Therefore, by using a magnifying glass with high magnification, it is possible to focus on a desired position even if the field of view becomes narrow. This is particularly convenient for focusing the entire subject in so-called tilt photography, in which photography is performed with the film surface set obliquely to the optical axis. Furthermore, when it is necessary to observe the balance of the entire subject, the magnifying glass mounting section of the dark box can be opened and closed, and by opening the magnifying glass mounting section, it becomes possible to observe the entire subject.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, FIGS. 1 to 3 show a first embodiment of the present invention, and in this embodiment, the viewfinder device 1 is a viewfinder of a camera 2, as shown in FIGS. The dark box 4 has a dark box 4 mounted on the screen 3, and the dark box 4 is formed by providing a magnifying glass mounting part 5 at the top of a dark box main body 4a consisting of four circumferential walls. 6 is installed. Here, Loupe 6
is constructed by supporting a lens 6a within a lens barrel 6b, and the lens 6a has an extremely high imaging magnification of 3 times or more in order to improve focusing accuracy. Therefore, when the magnifying glass 6 is fixed, the entire object on the viewfinder screen 3 cannot be observed.

Therefore, in order to be able to observe the entire area of the finder screen 3 using the magnifying glass 6, a light shielding support member is provided at the bottom of the magnifying glass 6 as shown in FIG. Support plate 7
is fixedly installed. This light shielding support plate 7
is made of an annular thin metal plate or the like, and its inner peripheral edge is fixed to the tip of the lens barrel 6b of the loupe 6 by means such as brazing.

On the other hand, a magnifying glass mounting section 5 provided at the top of the dark box 4
has two upper and lower thin plates 5a, 5a and a connecting portion 5b that connects each of the thin plates 5a, 5a with a predetermined space on the outer peripheral side. A slide receiving portion 8 is formed into which the light shielding support plate 7 is slidably inserted in a direction perpendicular to the optical axis L. Further, a circular opening 9 larger than the outer diameter of the loupe 6 is formed in the center of the thin plate 5a forming the loupe attachment part 5. This aperture 9 is for regulating the range in which the lens barrel 6b moves in the direction orthogonal to the optical axis L when the loupe 6 is attached.
The size is set so that when the magnifying glass 6 approaches the edge of the aperture 9, the end of the viewfinder image falls within the field of view of the magnifying glass 6. Further, the outer circumferential radius of the light-shielding support plate 7 is set to be slightly longer than the radius of the aperture 9 than the distance that the loupe 6 travels from the center position of the aperture 9 to the end thereof.

The present embodiment is constructed as described above, and the light-shielding support plate 7 connected to the magnifying glass 6 is inserted into the slide receiving part 8 formed between the thin plates 5a, 5a constituting the magnifying glass mounting part 5 in the dark box 4. It is assembled in a sandwiched state and installed on the viewfinder screen 3 of this camera 2.

Therefore, when photographing with the camera 2, in order to confirm whether or not the focus is accurate, it is necessary to observe the image of the subject formed on the viewfinder screen 3 through the loupe 5. do it. Here, since the lens 6a of the magnifying glass 6 is of high magnification, the image can be enlarged and observed, so that focusing can be performed extremely accurately.

However, as a result of increasing the magnification of the lens 6a in this manner, the field of view observed by the magnifying glass 6 is narrowed and does not cover the entire viewfinder screen 3. Therefore, for example, when focusing on the peripheral part of the image of the subject formed on the viewfinder screen 3, it is necessary to grasp the lens barrel 6b of the loupe 6 and move it in a direction perpendicular to the optical axis L. For example, the peripheral position of the finder screen 3 can be placed within the observation field of the magnifying glass 6, making it possible to focus in this area.

In this way, by moving the magnifying glass 6 in the direction perpendicular to the optical axis L, the magnifying glass 6
The focal length of the magnifying glass 6 does not change when the magnifying glass 6 is moved. Further, since the opening 9 is shielded by the light-shielding support plate 7 regardless of the position of the magnifying glass 6, light does not leak into the dark box 4, and therefore the viewfinder image on the viewfinder screen 3 is unclear. There is no risk of it becoming.

Next, FIGS. 4 to 6 show a second embodiment of the present invention, and as is clear from FIGS. 4 and 5, this finder device 10 is designed to surround a finder screen. There is a magnifying glass attachment part 1 that can be opened and closed on the top of the dark box main body 11, which consists of four surrounding walls.
By providing 2, a dark box 11 is formed. The magnifying glass mounting portion 12 is composed of an upper member 12a and a lower member 12b, and a slide receiving portion 14 is formed between the upper member 12a and the lower member 12b.

The lens 15a is attached to the lens barrel 15 in the loupe attachment part 12.
The magnifying glass 15 supported by b is mounted so as to be movable in a direction perpendicular to the optical axis L via a light-shielding support member, as shown in FIG. , magnifying glass attachment part 12
It consists of an annular fixed light shielding support plate 16 fixed to the lower part of the lens barrel 15b, and a movable light shielding member 17 provided to sandwich the fixed light shielding support plate 16. The movable light shielding member 17 has an upper and lower annular shape. Plate bodies 17a, 17a
and a connecting portion 17b that connects the outer peripheral portions of each of the annular plate bodies 17a, 17a, and the connecting portion 17
A slide space 18 is formed between the annular plates 17a and 17a by b, in which the fixed light-shielding support plate 16 is slid while being sandwiched therebetween. The inner diameter of the annular plate 17b constituting the movable light shielding member 17 is
The outer diameter of the fixed light shielding support plate 16 is smaller than the moving distance of the fixed light shielding support plate 16. Furthermore, this movable light shielding member 17 includes an upper member 12a that constitutes the slide receiving portion 14 of the loupe mounting portion 12;
It is designed to be able to slide on the lower members 12b while being held between the lower members 12b.For this purpose, a circular opening 19 is formed in the loupe attachment part 12, and the The relationship between the inner diameter of the opening 19 and the outer diameter of the movable light shielding plate 17 is similar to the relationship between the outer diameter of the fixed light shielding plate 16 and the inner diameter of the movable light shielding plate 17 described above.
It has become smaller by more than the movement range of .

In FIG. 4, 20 is a hinge for opening and closing the magnifying glass attachment part 12 with respect to the dark box body 11, and 21 is a hinge for easily fixing the dark box body 11 in the closed state by the magnifying glass attachment part 12. Each hook member is shown.

This embodiment is configured as described above, and with this, the magnifying glass 15 can be moved in a direction perpendicular to the optical axis L, and the lens 15a with high imaging magnification is used. It becomes possible to perform focusing while observing an image at an arbitrary position of the viewfinder image on the viewfinder screen.

Thus, the inside of the dark box 11 is blocked from light, and the magnifying glass 1 is
A fixed light shielding support plate 16 to which the magnifying glass 15 is directly attached, and a movable light shielding member that is movable relative to the fixed light shielding support plate 16 in a direction perpendicular to the optical axis L of the magnifying glass 15. 17
Therefore, it is possible to use an outer diameter that is approximately half of the light shielding support plate 7 in the first embodiment described above, and the slide receiving part 14 of the loupe mounting part 12 can also be made smaller. become able to.

Furthermore, since the lens magnification of the loupe 15 is increased, it becomes impossible to observe the entire viewfinder image, but if it is necessary to observe the balance of the entire image, for example, the loupe mounting portion 12 may be opened. For example, it becomes possible to directly observe the entire subject image projected on the viewfinder screen.

In addition, in each of the above-mentioned embodiments, the light-shielding support member to which the magnifying glass is attached and the opening that defines the movable range of the magnifying glass are circular, but they may have a square shape, for example. . Alternatively, the magnifying glass mounting portion may be formed of a thin plate, and a slide receiving portion may be provided on the light-shielding support member side, and the magnifying glass mounting portion may be slidably held in the slide receiving portion.

[Effects of the invention] As detailed above, according to the invention, the loupe is supported movably in the direction perpendicular to the optical axis with respect to the loupe attachment part in the dark box, so it is possible to use a high-magnification lens. Using the attached magnifying glass, it is now possible to greatly enlarge the viewfinder image for observation, allowing more accurate focusing, and even with such a high magnification lens, the magnifying glass By moving it, it becomes possible to focus on a desired position, making it possible to take high-quality photographs, and it produces excellent effects such as being able to focus over a wide range, which is especially necessary in tilt photography.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a sectional front view of main parts of a camera equipped with a finder device, FIG. 2 is a perspective view of FIG. 1, and FIG.
The figure is a perspective view of a magnifying glass and a light-shielding support member, FIGS. 4 to 6 show a second embodiment of the present invention, FIG. 4 is a sectional view of the finder device, and FIG. 5 is a plan view of the finder device. FIG. 6 is an exploded perspective view of the magnifying glass and the light shielding support member. 1, 10...Finder device, 2...Camera,
3...Finder screen, 4, 13...Dark box, 4a, 11a...Dark box body, 5,12...Magnifying glass attachment part, 6,15...Magnifying glass, 5a, 15a
...Lens, 5b, 15b... Lens barrel, 7... Light-shielding support plate, 8, 14... Slide receiver, 9... Opening, 16... Fixed light-shielding support plate, 17... Movable light-shielding member, 18... ...Slide space, 19...Opening, 2
0... Hinge member.

Claims (1)

[Claims for Utility Model Registration] (1) In a camera viewfinder device comprising a magnifying glass attached to a dark box installed above the viewfinder of the camera, the magnifying glass attachment part of the dark box has an opening larger than the outer diameter of the magnifying glass. The loupe is supported by a light-shielding support member that shields the opening, and the light-shielding support member is movably attached to the loupe mounting portion, so that the loupe can be aligned with the optical axis within a predetermined range. A camera finder device characterized in that it is movable in orthogonal directions. (2) The camera viewfinder device according to claim 1, wherein the magnifying glass mounting portion is provided with a slide receiving portion that slidably holds the light shielding support member. (3) The light-shielding support member is composed of a fixed plate fixed to the magnifying glass and a movable plate that slidably clamps the fixed plate, and the movable plate is slidably clamped to the slide receiving part. A camera finder device according to claim (2) of the utility model registration, characterized in that the camera is configured as follows. (4) Utility model registration claim No. (1) characterized in that a slide receiving portion is formed in the light-shielding support member, and the magnifying glass mounting portion is slidably held in the slide receiving portion. The camera finder device described in Section 1. (5) The camera viewfinder device according to any one of claims (1) to (4) of the utility model registration claim, characterized in that the magnifying glass attachment part of the dark box can be opened and closed.