JPH05281633A - Panoramic adapter - Google Patents

Abstract

PURPOSE:To photograph a panoramic, or a standard screen sized image on one film without costing by forming an aperture whose aspect ratio is the same as that of the panoramic screen size on an attachment main body. CONSTITUTION:The panoramic adapter 2 is loaded on the front surface of a camera, and a wide converter lens 10 is held in the adapter main body 3. The wide converter lens 10 is constituted of a convex lens 13 and a concave lens 14, and a shielding plate 16 having the aperture 15 whose aspect ratio is the same as the aspect ratio of the panoramic screen size is arranged in front of the convex lens 13, and an optical path control plate 18 having the same aperture 17 as the aperture 15 is arranged behind the concave lens 14. When the panoramic adapter 2 is loaded on the camera, light from an object is partly cut and then, made incident on a photographic lens 10, so that the panoramic photographing can be performed. And also, by providing the converter lens 10 and the optical path control plate 18, the panoramic photographing can be performed at a wide angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adapter mounted on the front surface of a taking lens, and more particularly to a panorama which forms an opening having the same ratio as the aspect ratio of the panoramic screen size to regulate the taking optical path of the taking lens. It is about adapters.

[0002]

2. Description of the Related Art Recently, a camera using a photographic film having a width of 35 mm has a screen size of 24 mm × one frame.
A 36 mm size is used as a standard screen size, and a camera capable of shooting a screen size other than the standard screen size by various mechanisms is used. Among them, the top and bottom of the standard screen size of 24 mm x 36 mm film screen is 5.5 mm.
The 13 mm x 36 mm screen size cut by each is called a panorama screen size, and it is popular because it produces powerful images. Therefore, you can select a desired screen size from multiple screen sizes with one camera so that you can enjoy a variety of shooting, not with a dedicated camera that shoots only the standard screen size or other screen sizes A camera that can shoot is proposed. In this type of camera, there are a camera in which an attachment for covering a part of the screen is attached in advance inside the camera, a camera in which a screen size switching mechanism is incorporated, and the like.

[0003]

However, it is difficult for the former camera to take images with different screen sizes on one film. In the latter camera, as described in Japanese Utility Model Laid-Open No. 3-122435, since the aperture is switched between the standard screen size and the panoramic screen size in association with the switching knob, images of different screen sizes can be displayed on one film. Although it is possible to take pictures, it is necessary to incorporate a screen size switching mechanism, which causes a problem of high manufacturing cost.

The present invention has been made in consideration of the above-mentioned problems of the prior art.
It is an object of the present invention to provide a panorama adapter adapted to capture a panorama screen size or standard screen size image.

[0005]

In order to achieve the above object, in the panorama adapter according to claim 1, the attachment body detachably mounted on the front surface of the taking lens has the same ratio as the aspect ratio of the panoramic screen size. Forming an opening with. Further, in the panorama adapter according to claim 2, the attachment body detachably mounted on the front surface of the taking lens is provided with a converter lens and an optical path regulating plate having an opening whose ratio is the same as the aspect ratio of the panoramic screen size. It is a thing.

[0006]

1 and 2 show a panoramic adapter of the present invention. This panorama adapter 2 includes an adapter body 3 mounted on the front surface of the camera, and this adapter body 3
Hook part 5 rotatably attached to the pin via pin 4
Consists of. The hook portion 5 is formed with an opening portion 6 that engages with an accessory shoe of the camera, and a locking claw 7 that is provided on the free end side of the hook portion 5 and that locks with the back surface of the camera.

The adapter body 3 comprises a lens barrel portion 11 for holding the wide converter lens 10 therein, and an opening 12 formed above the lens barrel portion 11. The opening 12 serves as a path for the near infrared rays or the like projected toward the subject during distance measurement. The wide converter lens 10 is composed of a pair of a convex lens 13 and a concave lens 14, and enables wide-angle photography by the camera. On the front surface of the convex lens 13, a shield plate 16 having an opening 15 having the same aspect ratio as the panoramic screen size is arranged, and the shield plate 16 is formed integrally with the lens barrel 11. Also, behind the concave lens 13,
An optical path regulating plate 18 having an opening 17 similar to the opening 15 is arranged. Although the wide converter lens is used for the lens barrel in this embodiment, it is also possible to use a teleconverter lens.

As shown in FIG. 3, the optical path regulating plate 18 is formed with a pair of positioning projections 18a and 18b. The pair of protrusions 18a and 18b are provided on the optical path regulating plate 18
When the lens barrel 11 is inserted into the lens barrel 11 from the rear side, it is guided by a guide groove (not shown) formed in the lens barrel 11. After the insertion, the optical path regulating plate 18 is fixed by the stop ring 19, but the opening 17 and the opening 15 do not tilt with respect to each other.

[0009] The panorama adapter 2 configured as described above
The action of will be described. When the photographer desires panoramic photography, the lens barrel 11 is put on the lens barrel of the camera, the hook 5 is rotated, and the locking claw 7 is locked to the back of the camera to mount the panorama adapter 2 on the camera. To do. As a result, the optical axis of the wide converter lens 10 coincides with the photographing optical axis of the camera. After that, the light from the subject passes through the opening 15, the wide converter lens 10, and the opening 17, and enters the photographing lens of the camera. When the release button of the camera is pressed in this state, the light from the subject, which is partially cut by the shielding plate 16 and the optical path restricting plate 18, is imaged on the film by the taking lens of the camera. The image formed on the film is powerful because the wide converter lens 10 captures a wide area.

FIG. 4 shows a film taken by a camera equipped with a panoramic adapter. Since a part of the light from the subject is cut off by the shielding plate 16 and the optical path regulating plate 18, the photographic screen 21 imaged in the film 20 has unexposed portions 22a, 22a at its upper and lower ends.
22b is present. Since the light flux diffracted at the end face of the opening 17 reaches the unexposed portions 22a and 22b toward the center, the exposure amount gradually increases. However, since completely unexposed portions remain on both upper and lower ends, when it is detected at the time of printing, the panorama print process, for example, vertical 13 mm × horizontal 13 mm × horizontal 35
When the frame size of mm is enlarged and printed, the panoramic print photograph 23 as shown in FIG. 5 is obtained.

If the photographer desires standard photography,
Remove the panorama adapter 2 from the camera. As a result, the light from the subject enters the taking lens of the camera without being cut. When the release button of the camera is pressed in this state, all the light from the subject is imaged on the film by the photographing lens, and the light is emitted vertically 24
Standard shooting of frame size of mm x 35 mm is possible.

FIG. 6 shows another embodiment of the panorama adapter of the present invention. In this panorama adapter 30, the lens barrel portion 11 has a simple structure in which an opening 15 is formed on the front surface so that a single film can capture an image of a panoramic screen size or a standard screen size. Therefore, the panorama adapter 30 can further reduce the manufacturing cost by omitting the wide converter lens 10 and the optical path restricting plate 18.

[0013]

As described above, the panorama adapter according to claim 1 has a simple structure in which the opening having the same ratio as the aspect ratio of the panoramic screen size is formed in the attachment body, so that the manufacture is easy. Besides, it can be manufactured at low cost. Then, when this panorama adapter is attached to the camera, a part of the light from the subject is cut and enters the photographing lens, so that panoramic photographing can be performed. Also, since the panorama adapter is attached during panoramic photography, it is possible to know the switching state of the screen simply by looking at the front of the camera. The panorama adapter according to claim 2 has a converter lens on the attachment body,
With a simple configuration in which an optical path regulation plate having an opening whose ratio is the same as the aspect ratio of the panoramic screen size is provided, panoramic photography can be performed at a wide angle.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a panoramic adapter of the present invention.

FIG. 2 is a perspective view showing an appearance of the panorama adapter shown in FIG.

FIG. 3 is a perspective view showing an optical path restricting plate inserted into a lens barrel portion.

FIG. 4 is an explanatory view of a film taken by a camera equipped with the panorama adapter of the present invention.

5 is a diagram showing a print photograph of the film shown in FIG.

FIG. 6 is a cross-sectional view showing another embodiment of the panorama adapter of the present invention.

[Explanation of symbols]

 2 Panorama adapter 3 Adapter body 11 Lens barrel 10 Converter lens 13 Convex lens 14 Concave lens 15, 17 Aperture 18 Optical path regulation plate

Claims (2)

[Claims] 1. An attachment body detachably mounted on the front surface of a taking lens, wherein an opening having the same ratio as the aspect ratio of a panoramic screen size is formed to regulate the taking optical path of the taking lens. Panorama adapter to do. 2. An attachment body, which is detachably mounted on the front surface of the taking lens, is provided with a converter lens and an optical path regulating plate having an opening whose ratio is the same as the aspect ratio of the panoramic screen size. A panoramic adapter characterized by regulating the optical path.