JPH0734419Y2 - Albada reverse galileo finder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to the structure of an albada-type reverse Galileo finder.

[Conventional technology]

Generally, in cameras other than single-lens reflex cameras, when different field frames are required depending on the shooting conditions, the field frames are mechanically switched using a Keplerian real image finder or a daylighting reverse Galileo finder, or it is unavoidable. In most cases, multiple field frames were displayed at the same time using an Albada-type reverse Galileo finder.

[Problems to be solved by the device]

However, in the case of the Kepler-type real image finder, it is inevitable that the cost will be higher than other methods because it requires an erecting optical system.In the case of the daylighting type reverse Galileo finder, the reverse Galileo optical system is inevitable. In addition to the above, there is a drawback that it requires a large space because it requires an optical path for a field frame. Further, when a plurality of field frames are simultaneously displayed on the Albada reverse Galileo finder, the inside of the field frame becomes very complicated, and at the same time, it is difficult for the user to know which field frame to select.

[Purpose of device]

The present invention has been made in view of the above points, and an object thereof is to provide an albada-type reverse Galileo finder that has a simple structure and can reliably switch the field of view.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a first field frame provided in the periphery of the field of view of the finder showing a shooting range in the first shooting mode, and provided inside the field of view of the finder with respect to the first field frame. And a shielding portion having a shape corresponding to the second visual field frame, the visual field frame having at least two types of second visual field frames indicating a photographing range in the second photographing mode narrower than the photographing range in the first photographing mode. The blind member having the movable portion is movable in a direction orthogonal to the finder optical path within a range in which the shielding portion does not deviate from the finder optical path,
In the first photographing mode, the blind member is moved to a position where the shielding section covers the second field frame.

In addition, a first visual field frame, which is arranged between the half mirror and the eyepiece and is composed of four marks for indicating a photographing range in the first photographing mode, and a photographing range in the second photographing mode are shown. A second field frame formed by a line extending across the field of view of the finder inside the first field frame, and integrally formed to correspond to the second field frame. The second field frame is movable between the second field frame and the half mirror in a direction orthogonal to the finder optical path. In the first shooting mode, the second field frame can be seen from the eyepiece side by overlapping the second field frame. A shielding bar is provided to block the light so that the second field frame can be seen in the second photographing mode.

The shielding bar is integrally provided with shielding portions corresponding to the marks of the first visual field frame above and below the shielding bar, and the shielding portions overlap the marks of the first visual field frame so that the first visual field from the eyepiece side. The second that shields the mark on the frame so that it cannot be seen
The position corresponding to the shooting mode of No. 1 and the position corresponding to the first shooting mode exposed so that the mark of the first field frame can be seen are slid vertically in accordance with the shooting mode. Good to do.

[Action]

As described above, in the present invention, since the blind member hides the unnecessary visual field frame according to the photographing mode, different visual field frame states are displayed for each photographing mode, and the photographer makes a mistake in the visual field frame with a simple structure. To prevent that.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows a state in which the back cover of a camera using the Albada type reverse Galileo finder according to the embodiment is removed. A cartridge storage chamber 11 for storing a cartridge (not shown) is formed at the left end of the camera body 10, and a film winding chamber 13 having a winding spool 12 is formed at the right end. Further, an aperture 14 is formed between the cartridge storage chamber 11 and the film winding chamber 13 to guide the light transmitted through the taking lens (not shown) to the film surface.

At the upper left portion of the aperture 14, a sprocket 15 that engages with the perforation of the film to feed the film is provided. A shutter button 16 and a drive button 17, which will be described later, are provided on the upper surface of the camera body 10.

Mask plates 18 and 20 for restricting a photographing range are rotatably provided above and below the aperture 14. These mask plates 18 and 20 block a part of the light reaching the film surface through the taking lens, and are fully opened when performing normal shooting, and landscape panoramic shooting (pseudo) is performed.
When performing, the upper and lower parts of the aperture 14 are shielded from light. The negative film obtained by performing panoramic photography is enlarged and printed at the time of printing to create a panoramic photograph.

The opening / closing drive of the mask plates 18 and 20 is performed by the aperture 14
This is performed based on the slide operation of the changeover switch 22 arranged at the upper left of the. That is, one of the shooting modes is selected in advance when setting the film, and thereafter, shooting is performed in the same mode until the whole frame shooting is completed.

Above the changeover switch 22, a finder window 24 for observing a subject at the time of shooting is formed. Inside the finder window 24, an albada-type reverse Galileo finder shown in FIG. 1 is built. This finder has 2
Objective lens consisting of one concave lens 30 and 31 and convex lens 32
And an eyepiece lens.

As shown in FIG. 3, on the surface of the eyepiece lens 32 on the concave lens 31 side, as shown in FIG. 3, a distance measuring mark 35 indicating a distance measuring area at the time of autofocus, and a normal field of view showing a photographing range at the time of normal photographing. A frame 34 and a field-of-view frame 40 for panoramic photography are each vapor-deposited with aluminum. In the present embodiment, the normal visual field frame 34 has four corner marks, which indicate the squares of the photographing range in the normal photographing mode, and the panoramic visual field frame 40 has two rectangular lines extending across the fine visual field. It is a line and indicates the upper and lower ends of the shooting range in the panoramic shooting mode. In addition, the concave surface of the concave lens 31
31a is provided with a semi-transparent mirror (half mirror) so that the light reflected by the mark 35 and the field frames 34, 40 is concave surface 3 of the concave lens 31.
It reaches the eyes of the photographer after being reflected by 1a.

A blind plate 38 that blocks light to the panoramic field frame 40 is arranged in the finder optical path between the concave lens 31 and the eyepiece lens 32, that is, between the concave surface 31a and the field frames 34 and 30. As shown in FIG. 3, the blind plate 38 is integrally formed with two shield bars 41 and 42 at a position corresponding to the panoramic field frame 40, and is vertically moved by pressing the drive button 17. Then, the field frame 40 is exposed and shielded. Such a movement stroke of the blind plate 38 is generated by the field frame 40.
It is set to the minimum that can expose and shield the
Since the blind plate 38 is disposed close to the eyepiece lens 32, the shielding bars 41 and 42 themselves are not observed through the viewfinder window 24 due to the diopter shift even in the viewfinder optical path.

At the upper end of the blind plate 38, a spring member 44 is arranged to return the drive button 17 by urging the blind plate 38 upward. In addition, at the lower end of the blind plate 38,
As shown in the drawing, a lock claw 45 for fixing the position of the plate 38 and a release claw 46 for releasing the lock are formed respectively.

With such a configuration, when the blind plate 38 is lowered by pressing the drive button 17, the lock claw 45 moves to the finder body 47.
Engages with the engaging claw 48a formed on the inner surface of the guide groove 48 of
The position of the blind plate 38 is fixed so that the shielding bars 41 and 42 are in front of the panoramic field frame 40. Also the drive button
When 17 is further pressed, the lock release claw 46 comes into contact with the engagement claw 48a, the blind plate 38 retreats to the left, and the lock of the blind plate 38 is released.

Next, the operation and action of the embodiment configured as described above will be described. First, a cartridge (not shown) is loaded in the cartridge storage chamber 11, and the changeover switch 22 and the drive button 17 are operated to select normal photographing or panoramic photographing.

That is, when normal shooting is selected, the drive button 17 is made to project as shown in FIG. 3 (A) together with the slide operation of the changeover switch 22. Then, the mask plates 18 and 20 are vertically retracted by a drive mechanism (not shown), and the aperture 14 is fully opened. On the other hand, the blind plate 38 is fixed in the raised position as shown in FIG.
The panoramic field of view frame 40 is shielded by the shield bars 41 and 42. As a result, as shown in FIG. 5A, only the distance measuring mark 35 and the normal visual field frame 34a are observed from the viewfinder window 24, and the unnecessary panoramic visual field frame 40a is not observed in the normal photographing mode. Therefore, the photographer recognizes that the normal photographing mode is set, and operates the camera so that the subject fits within the field frame 34a to perform normal photographing.

On the other hand, when performing panoramic shooting, the changeover switch
The slide button 22 is operated and the drive button 17 is pushed downward. Then, the mask plates 18 and 20 rotate to shield the upper and lower portions of the aperture 14 from light. Meanwhile, blind plate
38 descends against the force of the spring member 44 as shown in FIG. 3 (B) to expose the panoramic photographing field frame 40. As a result, the panoramic visual field frame 40a is observed from the viewfinder window 20 together with the normal visual field frame 34a as shown in FIG. Therefore, the photographer recognizes that the camera is in the panoramic photography mode, and operates the camera to set the subject within the field frame 40a.

Next, when the shutter button 16 is pressed to open a shutter (not shown), the light transmitted through the photographing lens is illuminated by the aperture 14
At, the upper and lower parts are cut to reach the film.

The shape of the blind member is not limited to that of the above-described embodiment, and as shown in FIG. 6, the shielding portions 52 for shielding the normal visual field frame 34 at the four corners of the blind member 50. 55 may be formed so that the normal field frame 34 is shielded and only the panoramic field frame 40 is exposed during panoramic photography. With this configuration, the field frame can be identified more reliably than in the above embodiment.

Further, as shown in FIG. 7, even if a transparent plate 60 having a visual field frame 59 formed between it and the blind member 58 is not formed in the ocular lens 32, the visual field frame is formed behind the ocular lens 32. May be.

Further, the present invention is not limited to switching between normal shooting and panoramic shooting, but is also applied to switching of the field of view frame according to switching of the focal length of the lens based on switching between tele and wide, and switching of the field of view frame according to macro shooting mode. You can also

Further, although the changeover switch 22 and the drive button 17 are provided separately in the above-described embodiment, the changeover switch 22 may also have the function of the drive button 17.

[Effect of device]

As described above, in the present invention, the blind member arranged in the viewfinder optical path between the half mirror and the field frame shields and exposes the predetermined field frame according to the shooting mode. Since the visual field frame state is observed, the visual field frame can be identified with certainty even with a simple configuration, and there is an effect that it is possible to avoid an erroneous shooting due to misidentification of the visual field frame.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of an Albada type reverse Galileo finder according to an embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the back surface of the camera of the embodiment. FIGS. 3A and 3B are explanatory views showing the operation of the blind plate according to the embodiment. FIG. 4 is a cross-sectional view showing the structure of the lower end portion of the blind plate. 5 (A) and 5 (B) are explanatory views showing the operation of the embodiment. FIG. 6 is a schematic block diagram showing another embodiment of the present invention. FIG. 7 is a schematic view showing a main part of another embodiment of the present invention. 14 …… Aperture 17 …… Drive button 18,20 …… Mask plate 22 …… Changeover switch 24 …… Finder window 30,31 …… Objective lens 32 …… Eyepiece 34 …… Normal field of view frame 38,50,58… … Blind plate 40 …… Panorama field frame 41,42 …… Shielding bar 44 …… Spring members 52 to 55 …… Shielding part 60 …… Transparent plate.

Claims (3)

[Scope of utility model registration request] 1. In an Albada-type reverse Galileo finder, a first field frame provided around the field of view of the finder, which indicates a shooting range in the first shooting mode, and inside the field of view of the finder more than the first field frame. A shielding section having at least two types of visual field frames of a second visual field frame that is provided and has a narrower imaging range in the second imaging mode than the first imaging mode, and has a shape corresponding to the second visual field frame. The blind member having a movable part is movable in a direction orthogonal to the finder optical path within a range in which the shielding part does not deviate from the finder optical path, and the blind member is located at a position where the shielding part covers the second field frame in the first shooting mode. Albada-type reverse Galileo finder characterized by moving. 2. An albada-type reverse Galileo finder in which an objective lens, a half mirror and an eyepiece lens are sequentially arranged in a viewfinder optical path, the first mirror being arranged between the half mirror and the eyepiece lens.
A first field frame composed of four marks for indicating the field of view in the shooting mode and a first field frame for indicating the field of view in the second shooting mode extend across the field of view of the finder. A second visual field frame formed by a line is integrally formed so as to correspond to the second visual field frame, and is orthogonal to the finder optical path between the first and second visual field frames and the half mirror. Is movable in any direction, and in the first shooting mode, overlaps with the second viewing frame to block the second viewing frame from seeing from the eyepiece side. In the second shooting mode, the second viewing frame is blocked. An albada-type reverse Galileo finder, which is provided with a shielding bar for making it visible. 3. The occlusion bar, in which occlusion parts corresponding to the marks of the first visual field frame are integrally provided above and below the occlusion bar, and the occlusion parts overlap the marks of the first visual field frame to form an eyepiece. A position corresponding to the second shooting mode in which the mark of the first field frame is blocked from being seen from the lens side, and a first shooting in which the mark of the first field frame is exposed so that the mark can be viewed. The albada-type reverse Galileo finder according to claim 2, wherein a position corresponding to a mode is slid vertically in accordance with a shooting mode.