JPH063732A - Panoramic photographing method - Google Patents

Abstract

PURPOSE:To provide a new panoramic photographing method for inter cepting a luminous flux in a panoramic mode by using a lens barrier. CONSTITUTION:This panoramic photographing method is one for executing the panoramic photographing of a panoramic picture narrower than the normal picture by a photographing optical system on which the lens barrier LB closed to protect a photographic lens, at the time of nonphotographing, and opened so as not to intercept the luminous flux in a normal photographing mode, is provided on the object side of the photographic lens, and in the panoramic photographing mode, the focal length of the photographic lens is changed over to make is shorter than that in normal photographing, and simultaneously, a diaphragm S is stopped, to intercept the luminous flux to the part except the panoramic picture by the lens barrier LB.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panoramic photographing method.

[0002]

2. Description of the Related Art An ordinary photographic film, for example, a 35 mm film is used, and an exposure area for one frame is exposed only in a central area excluding upper and lower parts, that is, an area having a shorter width in the film width direction than usual. It is known that panoramic photography is performed by giving and photographing. By printing the film thus photographed with a large enlargement magnification, a horizontally long panoramic photograph than usual can be obtained.

In order to perform panoramic photography, it is only necessary to block the image forming light beam in the upper and lower portions of the exposure area for one frame of film. On the other hand, in order to protect the lens, an openable lens barrier is provided on the object side of the taking lens to eliminate the trouble of putting on and taking off the lens cap, and a camera has been put to practical use. Has been proposed (JP-A-3-184033).

However, in the above-mentioned "camera for panoramic photographing using lens barrier", since the photographing lens is common in the normal photographing mode and the panoramic photographing mode, it is usually taken in the panoramic photographing mode. It will only cut the top and bottom of the image shot in shooting mode,
Even if it is enlarged and printed, it tends to lack the "power" suitable for panoramic photography. If the angle of view of the taking lens is widened in order to obtain a powerful panoramic picture, the "usability" in the normal shooting mode becomes worse.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a novel panoramic photographing method which uses a lens barrier to block a light beam in a panoramic photographing mode. And

[0006]

According to the panoramic photographing method of the present invention, "a lens barrier which is closed to protect the photographing lens when not photographing, and which is in an open state so as not to block a light beam in the normal photographing mode is disposed on the object side of the photographing lens. Is a method of performing panoramic shooting on a panoramic screen that is narrower than the normal screen by the shooting optical system provided in ", in" panoramic shooting mode, the shooting lens focal length is switched to a shorter value than in normal shooting, and the aperture is narrowed, " The lens barrier blocks the light flux other than the panoramic screen ”(claim 1).

The "normal screen" is an exposure area exposed in the normal photographing mode, and means the "exposure area for one frame of film" described above. The “panorama screen” is an exposure area for panoramic photography set in a part of the normal screen, and has a smaller size than the normal screen.

"Switching focal length of photographing lens"
May be performed by "preparing a normal shooting lens and a panoramic shooting lens having a focal length shorter than that of the normal shooting lens and exchanging these lenses" (claim 2), " A zoom photographing lens is used as the photographing lens, and the focal length of the photographing lens is switched by zooming so that the zoom photographing lens is arranged at the wide-angle end in the panoramic photographing mode ”(claim 3).

Furthermore, the focal length of the taking lens may be switched by "attaching and removing the converter lens having a positive refractive power to the ordinary taking lens" (claim 4). Using the zoom shooting lens, switch to the focal length "by zooming the zoom shooting lens and attaching / detaching the converter lens having a positive refractive power to / from the zoom shooting lens", and in "Panorama shooting mode Move to the wide-angle end,
By adding a converter lens to the zoom photographing lens, the focal length can be made shorter than that at the wide-angle end arrangement ”(claim 5).

In the panoramic photographing method described in claim 1 or 2 or 3 or 4 or 5, "at least,
It is possible to use an aperture-shaped lens barrier in which a pair of end edges corresponding to the panoramic screen width direction is curved into a shape in which the panoramic screen width direction end edges are substantially straight lines ”(claim 6). The “panorama screen width direction” is the lateral direction of the panorama screen described above, and is usually the vertical direction when the camera is normally held.

[0011]

According to the present invention, as described above, in the "panoramic shooting mode", the taking lens has a "shorter focal length" or "wide angle" than in the normal shooting mode, and the diaphragm is narrowed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing an embodiment of the panoramic photographing method according to claims 1 and 2. 1A shows the normal shooting mode, and FIG. 1B shows the panoramic shooting mode. In the normal shooting mode, the normal shooting lens 1
A is used, and the object image is formed on the film surface 2. The normal screen on the film surface 2 is set by the aperture AP. Reference symbol S indicates a diaphragm, and reference symbol LB indicates a lens barrier. The lens barrier LB is closed during non-shooting to protect the shooting lens, but is opened during shooting to expose the shooting lens. As shown in FIG. 1A, in the normal shooting mode, the lens barrier LB does not block the image forming light flux for the normal screen.

As shown in FIG. 1B, in the panoramic photographing mode, the photographing lens is switched from the normal photographing lens 1A to the panoramic photographing lens 1B. The panoramic shooting lens 1B has a shorter focal length than the normal shooting lens. Therefore, the shooting range of the panoramic shooting lens 1B is wider than that of the normal shooting lens 1A, and part of the image-forming light beam is blocked by the lens barrier LB. At this time, the aperture width of the lens barrier LB is the same as that in the normal shooting mode.

Looking at the portion above the optical axis AX,
The image-forming light flux that forms an image between the optical axis AX and the position A is not blocked by the lens barrier LB.
A part of the imaging light flux that forms an image between B is blocked by the lens barrier LB. Therefore, in the area between the positions A and B, the exposure amount gradually decreases with distance from the optical axis AX, and the area closer to the aperture AP than the position B is not exposed.

Therefore, as shown in FIG. 1B, a partial area a or b of the normal screen can be used as a panoramic screen. At this time, when the diaphragm S is narrowed down, the position A moves to the aperture AP side, and the position B approaches the optical axis AX side, so that the interval between the positions A and B is narrowed and a substantially unique panoramic screen is set. be able to.

FIG. 2 is an explanatory view showing an embodiment of the panoramic photographing method according to the first and third aspects. Figure 2 (A)
Shows a normal shooting mode, and (B) shows a panoramic shooting mode. In order to avoid complication, the same reference numerals as those in FIG. 1 were used for those which seem not to be confused.
The photographing lens is a zoom photographing lens composed of a front group 2A having a positive refractive power and a rear group 2B having a negative refractive power, and a diaphragm S is provided between the front and rear groups.

As shown in FIG. 2A, in the normal photographing mode, the opened lens barrier LB does not block the image-forming light beam that is normally imaged in the screen. In the panoramic shooting mode, as shown in FIG. 2B, the zoom shooting lens moves to the film surface 2 side and is arranged at the wide-angle end to shorten the focal length. In this lens arrangement, the lens barrier LB (the aperture width is the same as in the normal shooting mode) blocks a part of the image-forming light beam, so that the exposure amount gradually decreases in the area between the positions A and B, The exposure amount is 0 in the area closer to the aperture AP than B. Therefore,
The area a or b shown in FIG. 2B can be used as a panoramic screen, and as in the case of the embodiment of FIG. 1, by narrowing down the diaphragm S, the positions A and B are brought closer to each other, and the position is substantially unique. You can set the panorama screen to.

FIG. 3 is an explanatory view showing an embodiment of the panoramic photographing method according to the first and fifth aspects. Figure 3 (A)
Shows a normal shooting mode, and (B) shows a panoramic shooting mode. Also in this figure, the same reference numerals as those in FIGS. 1 and 2 are used for the elements which are not considered to be confused. The photographing lens is a zoom photographing lens composed of a front group 2A having a positive refractive power and a rear group 2B having a negative refractive power, and a diaphragm S is provided between the front and rear groups.

As shown in FIG. 3A, in the normal photographing mode, the lens barrier LB having the aperture does not block the image-forming light beam which is normally formed in the screen. In the panoramic shooting mode, as shown in FIG. 3B, the aperture width of the lens barrier is the same as in the normal shooting mode, the zoom shooting lens is moved to the film surface 2 side to take a wide-angle arrangement, and By adding the converter lens 3 having a refracting power of 2 between the diaphragm S and the lens 2B, a focal length shorter than that at the wide-angle end arrangement is realized.

In this lens arrangement, the lens barrier LB blocks a part of the image-forming light beam, the exposure amount gradually decreases in the area between the positions A and B, and the exposure amount in the area closer to the aperture AP than the position B. Becomes 0. Therefore, the area a or b shown in FIG. 3 (B) can be used as a panoramic screen, and as in the case of the embodiment of FIG. You can set the panorama screen.

The focal length can be shortened by adding a converter lens having a positive refractive power as shown in FIG.
It can also be applied to the photographing optical system of (A). That is, FIG.
In the photographing optical system of (A), in the panoramic photographing mode, a converter lens having a positive refractive power is added to the normal photographing lens 1A to shorten the focal length, and the diaphragm S is narrowed down to display a panoramic screen. Can be set.

By the way, when performing panoramic photography by blocking a part of the image-forming light flux by the lens barrier, if the aperture shape by the lens barrier LB is a rectangular shape as shown in FIG. 4A, the panoramic photography is performed. As shown in FIG. 4B, the shape of the panoramic screen is such that the width of the panoramic screen gradually expands from the center of the screen toward both ends. Although such a panoramic screen shape is interesting as such, it is often preferred that the panoramic screen also has a rectangular shape.

To make the panoramic screen into a rectangular shape, refer to FIG.
As shown in (C), a pair of edge portions of the lens barrier LB corresponding to the panoramic screen width direction (vertical direction in the drawing) are
It may be curved outward, and the opening width in the above direction may be set to gradually decrease from the central portion toward both end portions. By doing so, a rectangular panoramic screen as shown in FIG. 4D can be obtained.

[0024]

As described above, according to the present invention, a new panoramic photographing method can be provided. Since this method is configured as described above, a powerful image suitable for panoramic photography can be captured in the panoramic photography mode. Further, the aperture width of the lens barrier may be the same in both the normal shooting mode and the panoramic shooting mode. It is possible to automatically switch the focal length of the photographing lens and narrow the aperture when switching the photographing mode.

[Brief description of drawings]

FIG. 1 is a diagram for explaining one embodiment of a panoramic shooting method according to claims 1 and 2.

FIG. 2 is a diagram for explaining one embodiment of the panoramic photography method according to claims 1 and 3;

FIG. 3 is a diagram for explaining one embodiment of the panoramic photography method according to claims 1 and 5;

FIG. 4 is a diagram for explaining a characteristic part of the panoramic photography method according to claim 6;

[Explanation of symbols]

 1A Lens for normal shooting 1B Lens for panoramic shooting 2 Film surface LB Lens barrier S Aperture AP Aperture

Claims (6)

[Claims] 1. A non-photographing lens is closed to protect a photographing lens,
It is a method to perform panorama shooting on a panoramic screen narrower than the normal screen by a shooting optical system provided with a lens barrier that is in an open state so as not to block the light flux in the normal shooting mode, on the object side of the shooting lens. Switch the shooting lens focal length to a shorter value than during normal shooting, and close the aperture.
A panoramic photography method characterized in that the lens barrier blocks light rays other than a panoramic image. 2. The panoramic photographing method according to claim 1, wherein the focal length of the photographing lens is switched between a normal photographing lens and a panoramic photographing lens having a shorter focal length than the normal photographing lens. A panoramic shooting method characterized by being exchanged. 3. The panoramic photographing method according to claim 1, wherein a zoom photographing lens is used as the photographing lens, and the focal length of the photographing lens is switched by zooming. In the panoramic photographing mode, the zoom photographing lens is arranged at the wide-angle end. The panoramic shooting method is characterized in that. 4. The panorama method according to claim 1, wherein the focal length of the photographing lens is switched by attaching / detaching a converter lens having a positive refractive power to / from a normal photographing lens. How to shoot. 5. The panoramic photographing method according to claim 1, wherein a zoom photographing lens is used as a photographing lens, the focal length of the photographing lens is switched, the zoom photographing lens is zoomed, and a converter lens having a positive refractive power is used. In the panorama shooting mode, by moving the zoom shooting lens to the wide-angle end side and adding a converter lens to the zoom shooting lens, the focal length is shorter than the wide-angle end arrangement. A panoramic shooting method characterized by being in a state. 6. The panoramic photographing method according to claim 1, 2 or 3 or 4 or 5, wherein at least one pair of end edges corresponding to the width direction of the panoramic screen is at least one end edge corresponding to the width direction of the panoramic screen. A panoramic image capturing method characterized by using a lens barrier having an aperture shape curved into a substantially straight line shape.