JPH066333Y2 - Finder equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is directed to photographing and recording equipment including an optical system such as a still camera, a movie camera, and a television camera, and other observation equipment. The present invention relates to a finder for observing a subject or the like to be observed from different angles.

[Prior Art] When performing various operations such as photographing, recording, and observing using various equipment including the above optical system, it is often necessary to change the angle for observing the viewfinder depending on the subject and the position occupied by the subject. For this reason, various conversion methods for converting the optical axis of the finder eyepiece from the horizontal direction to the vertical direction have been proposed.

The most primitive one is another attached member (usually called an adapter or attachment) that includes a reflector at the rear end of the finder eyepiece that has a horizontal optical axis and is placed at an angle of 45 ° to the optical axis. ) Is attached to reflect the emitted light of the finder from the horizontal direction to the vertical direction. The advantage of this is that not only the finder emitted light can be reversed from the horizontal direction to the vertical direction, Depending on how the members are mounted, the viewfinder can be viewed from two directions orthogonal to the shooting optical axis in a horizontal plane that is usually called the eye level and is parallel to the shooting optical axis. In addition to the above-mentioned conversion of the viewing direction, which uses the light to look into the viewfinder from above, which is usually called waist level, Finder 覗視 from the right or left side of the photographing optical axis in level is that performed. However, with the method of attaching and detaching the additional member including such a reflecting mirror, it is necessary to always carry the additional member separately, and if the user forgets to carry it, the desired viewfinder viewing angle can no longer be changed. In addition to the defect that it disappears, the separately installed member causes a reversal phenomenon in the viewfinder image because the viewfinder exit light is reflected by a reflecting mirror that is installed at an angle of 45 ° with the viewfinder optical axis.
In the case of tracking a subject, there is a drawback that it is easy to obtain and direct the photographing optical axis in the opposite direction.

As an example of preventing the reversal phenomenon from occurring in the image in the finder field, a camera body including the photographing optical axis X and a cathode ray tube (hereinafter abbreviated as CRT) as seen in many TV cameras are used. Apart from the finder block that includes it, there is one that targets the viewfinder image to the image that is electrically transmitted from the camera body to the CRT finder block. This is shown in FIG. In the figure, X is the photographing optical axis of the photographing lens L, and the inverted inverted image in the camera body CB by this optical axis X is transmitted as an upright normal image through the connection cable CC into the CRT finder block FB, and the viewfinder The object image is viewed through the visual axis Z.

According to this method, the CRT finder block FB has the advantage that the field of view image of the subject can always be regarded as a finder regardless of the direction in which the photographing optical axis X is directed. To convert the viewfinder into the viewfinder, simply move the CRT finder block FB up and down about the horizontal axis that intersects the optical axis X. This method, of course, requires the technology to electrically transmit the subject image once and the image reproduction in the CRT finder block FB. Instead of looking directly at the optical image, the electronic reproduction image To form an image in the finder field, which causes various defects.

Another example of the viewfinder of the television camera is shown in FIG. In the example shown in FIG. 2, in guiding an inverted image from the photographing optical axis X to the finder optical system, a finder optical axis Y orthogonal to the photographing optical axis X is formed. A view direction changing member C having a reflecting mirror M obliquely installed at an angle of 45 ° is attached to a viewfinder optical axis Y.
A device that can be rotated around the axis has been proposed so that a television camera or the like can see the example.

In this case, in order to make the image of the observing optical axis Z reflected by the reflecting mirror M an erect image, the inverted inverted image of the subject is observed by the photographing optical axis X in consideration of the reflection inversion phenomenon by the reflecting mirror M. It goes without saying that it is necessary to make the image an erect image in the process of extracting the image on the optical axis Z.

Another example executed in order to avoid such an erecting of an optical image is, as described with reference to FIG. 1, a component portion including the viewfinder optical axis Y with respect to the camera body CB. To
Configured as a CRT finder block, taking into account image reversal by the reflecting mirror M, an electronically reproduced image is formed in which only left and right images are reversed in the CRT finder block, and the visual field image by the viewfinder viewing optical axis Z is erected. It is to be visually recognized as an image.

Another known example in which an electronic image is viewed directly from an optical image instead of a viewfinder image is shown in Showa 56
There is a viewfinder of a photographing device disclosed in Japanese Utility Model Publication No. 7934. In this invention, the first reflection surface having the light beam optical axis incident on the finder optical path at an incident angle of 22.5 °, and the second reflection surface having the optical axis of the light beam reflected from the first reflecting surface incident on the 22.5 ° incident angle And the second reflection surface is centered on the optical axis of the light flux reflected from the first reflection surface.
It is designed to rotate 180 °, which allows the viewfinder to be viewed by eye level before the second reflecting surface is rotated and by the waist level by rotating the second reflecting surface by 180 °. I am trying to do it.

FIG. 6 shows an explanatory view of this known technique. By explaining this, Y is a finder optical axis, and FM is a first obliquely installed at an angle of 22.5 ° with respect to the optical axis Y.
It is a reflective surface. Y'is a reflection finder optical axis which is reflected by the first reflection surface FM, and a second reflection surface SM which is rotated by 180 ° about the reflection finder optical axis Y'is the optical axis Y. It is installed at an angle of 22.5 ° to ′. As a result, before the second reflecting surface SM rotates, both reflecting surfaces FM and SM are arranged in parallel with each other, so that the viewing optical axis Z as a finder is parallel to the finder optical axis Y that is initially incident. , Which allows the viewfinder to look through the eye level. When the second reflecting surface SM is rotated by 180 ° around the reflection finder optical axis Y ′, the light reflected by the second reflecting surface SM which is rotationally occupied (the rotation position is shown by a broken line in the figure) is vertically upward. The optical axis of the viewfinder as a viewfinder is changed to the vertical direction, and the viewfinder can be viewed at the waist level (indicated by Z'in the figure).

[Problems to be Solved by the Invention] All of the above-described techniques for changing the view direction of the viewfinder by the known techniques have advantages and disadvantages, and if it is considered that it is desirable to directly look at an optical image, The technology shown in the utility model application publication No. 7934 of 1981 is
Although it can be evaluated as an excellent technique, the technique for converting the viewfinder viewing direction according to the disclosed technique still has room for improvement in the following points.

That is, as is clear from FIG. 6, assuming that the aperture required for the finder light beam is A, the first reflecting surface FM is effective because the first reflecting surface FM is obliquely arranged at an angle of 22.5 ° with respect to the finder optical axis Y. The length of the reflecting surface is about 2.8A, and similarly, the length of the second reflecting surface SM is required to be about 2.8A. This means that the total length of the viewfinder optical system is long, and the size of the viewfinder image of the same size is large when viewed from the meridional section, making the optical equipment that should be mounted compact. Therefore, it was not necessarily an effective means.

In the present invention, a novel optical conversion device that makes the whole view extremely compact by incorporating it in the viewfinder device itself without performing the eye level and waist level viewfinder viewing by means of a separate member. It is the one we are trying to provide.

[Means for Solving Problems] 1981 Utility Model Application Announcement No. 1 known as a conventional technology
The defect in the invention disclosed and proposed in No. 7934 is that the first reflecting surface FM is obliquely arranged at an angle of 22.5 ° with respect to the finder optical axis Y, and also with respect to the reflecting optical axis Y ′ reflected by this reflecting surface. , Paying attention to the fact that it is caused by disposing the second reflecting surface SM at an angle of 22.5 °, and in the present invention,
For the purpose of shortening the total length of the optical path, the first reflecting surface 1
R is not a fixed reflection surface, but is diagonally arranged so as to intersect with the finder optical axis Y, and at a point intersecting with the finder optical axis Y, the finder optical axis Y is rotated about a horizontal axis orthogonal to the finder optical axis Y. By rotating 180 ° to the center and setting the second reflecting surface 2R for viewing at the eye level and the second reflecting surface 2r for viewing at the waist level individually, the entire optical path can be set. It was significantly shortened and succeeded in making it compact. The actual condition will be described with reference to FIG. 7, and in FIG. 7, the first reflecting surface 1R is positioned from the solid line display position to the dotted line display position around the horizontal axis orthogonal to the optical axis Y including the point P on the optical axis. It is designed to be rotated to 180 ° around the optical axis Y of the finder, so that when the first reflection surface 1R occupies the position shown by the solid line in the figure, the reflection The light reflected by the surface is reflected by the second reflecting surface 2R and is taken out as a viewing optical axis Z parallel to the viewfinder optical axis Y, and the viewfinder is viewed by the eye level.
On the other hand, from this position, the first reflecting surface 1R is rotated to a position indicated by a broken line around the horizontal axis including the point P, or 180 degrees around the finder optical axis Y including the point P. When brought to the position shown by the broken line in the figure, the light of the finder light flux is not directed to the second reflecting surface 2R but is reflected by the second reflecting surface 2r and is directed vertically upward, so that the finder can be seen at the waist level. It will be possible. What is clear from this example is that, as is clear from the above-mentioned known example, a total of two reflecting mirrors, each of which is a fixed reflecting surface, is required for each level, and the finder luminous flux is required. If the diameter is the same as A, the length of the mirror surface that receives this will be about 1.1 A, and the objective can be achieved with a size of about 1 / 2.5, and how can the whole be made compact? Will be understood.

[Embodiment] The present invention will be described in more detail with reference to the illustrated embodiment according to the present invention. FIG. 8 shows an optical arrangement for clarifying the gist.

In this figure, the respective parts indicated by the same reference numerals as in FIG. 7 indicate the same parts, but E in FIG. 8 is a finder eyepiece.

The finder light flux is centered on the optical axis Y and is the first reflection surface 1R.
However, when the first reflection surface 1R occupies the position indicated by the solid line in the figure, the incident light beam is reflected toward the second reflection surface 2R, and the finder light beam incident on the second reflection surface 2R is the second light beam.
The light is reflected by the reflecting surface 2R and emitted through the eyepiece E shown by the solid line.

On the other hand, when the first reflecting surface 1R is slightly rotated about the horizontal axis including the point P on the optical axis from the solid line position toward the broken line position, the finder light beam is occupied downward by the second reflection surface. The finder light flux reflected toward the surface 2r and incident on the second reflective surface 2r is incident on the second reflective surface 2r and directed vertically upward. The following two methods are adopted as the rotating means of the first reflecting surface 1R.

(1) It rotates about the horizontal axis (the front-back direction that penetrates the plane of the drawing) including the point P and orthogonal to the optical axis Y with the point P as the center.

(2) Rotate 180 degrees around the optical axis Y of the finder.

In association with the rotation of the first reflecting surface 1R, the optical element including the finder eyepiece E is moved to the horizontal axis (the viewing optical axis Z in the figure).
It rotates 180 degrees about a rotation axis R that makes an angle of 45 degrees with respect to the rotation axis R. By this rotation, the position of the eyepiece E shown by the solid line is changed to the position of the eyepiece E shown by the broken line in the figure, and the reflected optical axis from the second reflecting member 2r becomes the observing optical axis Z'according to the waist level. It is possible to view the required viewfinder in unison. Eyepiece E with the rotation of the above (1) or (2)
Since interlocking with the rotational displacement operation of the optical element including the above can be easily implemented by a known mechanical structure, it is omitted here, but in any case, in the present invention, the above ( By interlocking with the rotation movement of the first reflecting surface 1R of 1) or (2), or by individually manually turning the optical element including the eyepiece E 180 ° about the rotation axis R, the finder depending on the eye level. You can convert from peeping to waist-level viewfinder observing and vice versa with a simple operation.

An embodiment in which the above basic structure is applied to a television camera TC is shown in FIGS. 3A and 3B. FIG. 3A shows the state of finder viewing by the eye level as is clear from the state shown in the drawing, and FIG. 3B shows the optical element including the eyepiece E that rotates the first reflecting surface 1R as described above. The figure shows a case in which the finder is in a observing state by the waist level by rotating 180 ° about a rotating shaft R having an inclination of 45 ° with respect to the finder optical axis Y parallel to the axis X.

FIG. 4 shows an embodiment in which the present invention is applied to a single-lens reflex camera. The light emitted from the pentaprism of the single-lens reflex camera is used as the finder optical axis Y, and the light is reflected by the above (1) or (2). ) Of the first reflecting surface 1R of FIG.
A single unit that can be rotated by 180 ° around a rotation axis R that is obliquely crossed is mounted.

FIG. 5 shows an example in which the viewfinder device of the present invention is incorporated in a compact camera case for a compact camera.

[Effects unique to the present invention] According to the present invention, eye level
Since the waist level can be switched, it is not necessary to link the CRT block. Therefore, as shown in FIGS. 3A and 3B, not only can the CRT block be freely arranged in parallel or perpendicular to the photographing optical axis X,
Since it is not necessary to move the CRT block, the holding mechanism of the CRT block can be made compact and compact, and as a result, it is very useful for making the entire TV camera compact.

As is clear from the above description, there are many advantages to miniaturization, not only when directly looking at an optical image, but also when making an electronic image with a CRT finder block. Since it has no effect on the change of the field of view magnification or the diopter, it has an excellent effect in practical use.

[Brief description of drawings]

FIG. 1 is a side view showing the outline of a television camera having a known CRT finder block and its finder device, and FIG. 2 is an outline of a known television camera with its finder optical axis temporarily placed horizontally. FIGS. 3A and 3B are side views showing the outline of a television camera embodying the present invention. FIG. 3A is an eye level viewing state and FIG. 3B is a waist level viewing state. FIG. 4 is a schematic side view showing a state in which the finder device of the present invention is applied to a single-lens reflex camera, and FIG. 5 is an example of applying the finder device of the present invention to a compact camera. Schematic side view showing,
FIG. 6 is an explanatory view showing an example of viewfinder viewing direction conversion in a known viewfinder device in which an optical image is directly viewed, and FIG. 7 shows a viewfinder device of the present invention in comparison with the example shown in FIG. FIG. 8 is an optical path diagram showing an example of the basic optical configuration of the finder device of the present invention. Y: viewfinder optical axis, 1R: first reflecting surface 2R: second reflecting surface, 2r: second reflecting surface Z: viewfinder viewing optical axis

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tadayu Kagawa, 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Nobuto Ebine 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Within Sony Corporation (56) References JP-A-59-204828 (JP, A) Actually-opened Shou 61-4935 (JP, U)

Claims (5)

[Scope of utility model registration request] 1. A first reflecting surface that reflects the light of a finder light beam, and a second reflecting surface that further reflects the light reflected from the first reflecting surface.
In a finder optical system including a reflection surface, a first reflection surface 1R obliquely provided with respect to the optical axis Y of the finder light beam is rotatably supported, and the first reflection surface 1R is rotated at each rotation position. The second that re-reflects the light reflected from the surface 1R
The reflecting surfaces 2R and 2r are separately fixed and installed,
Rotating the optical element including the eyepiece E to be occupied on the optical axis of the finder light flux reflected from the second reflecting surface by 180 ° about the rotation axis R that obliquely intersects the optical axis Y of the finder light flux. Characteristic finder device. 2. A rotation axis for rotating the first reflecting surface 1R is located on a horizontal axis including an intersection point P of the finder optical axis Y and the first reflecting surface 1R and orthogonal to the finder optical axis Y. A finder device according to claim (1), which is characterized by utility model registration. 3. A rotating shaft for rotating the first reflecting surface 1R is located on the finder optical axis Y, and the first reflecting surface 1R is rotated 180 ° about the rotating shaft. The finder device according to claim (1) of the utility model registration claim. 4. The optical element including the eyepiece E is rotated by 180 ° about a rotation axis R obliquely intersecting the optical axis Y of the finder light beam, in conjunction with the operation of rotating the first reflecting surface 1R. A finder device according to claim (1), which is characterized by utility model registration. 5. A utility model registration claim (1) to claim 1, characterized in that the rotation axis R obliquely intersecting with the optical axis Y of the finder light beam occupies the optical axis Y at an angle of 45 °. The finder device according to any one of item (4).