JPS6084539A - Panoramic camera - Google Patents

Abstract

PURPOSE:To decrease the moment of inertia and to realize high-speed photography, lens interchange, etc., by concentrating in-photography rotating parts of a panoramic camera on a rotating shaft. CONSTITUTION:The panoramic camera has the 1st reflecting mirror 1 at 45 deg. to the optical axis of a lens system 2 and the reflecting mirror is rotatable around the optical axis. Further, an image inverting prism 3 rotates at a rotating speed a half as fast as the mirror 1. The 2nd reflecting mirror 4 is provided slantingly by 45 deg. to the optical axis and a slit window 6 and a film 6 which moves to its focal plane are provided in front of the focal plane on the optical axis of reflected light. The film 6 associates the rotation of an unshown sprocket, etc., with the rotation of the mirror 1 so that when the focal length of a lens is denoted as (f), the film is moved by 2pif in one turn of the mirror 1.

Description

[Detailed description of the invention] The present invention relates to a panoramic camera.

Conventional panoramic cameras use a lens system (including mirrors), a slit window, or the entire camera to rotate, and the film moves or is fixed to take pictures of the entire periphery or a wide angle, but very few cameras take pictures of the entire periphery. This is the type that rotates the camera and moves the film.

Therefore, cameras that take pictures of the entire surrounding area have disadvantages in that the moment of inertia of the rotating part is large because the camera rotates, making it difficult to take high-speed pictures and making the camera large.

The present invention eliminates these drawbacks and provides a panoramic camera with good performance by making lenses interchangeable.The structure of the present invention and its photographing principle are as follows.

A rotatable first reflecting mirror and an image reversing prism are provided on the optical axis of the lens system, and this prism has an inclination of 45° (which may be slightly changed as necessary).
The lens system and its lower side are attached to the camera body, which does not rotate at a rotational speed of . rcv tilt and f6
No. Yu. A film is moved to the focal plane on the slit window and the focal plane on the reflecting optical axis of the reflecting mirror.The moving speed is (rotation speed of the first reflecting mirror) x (focal distance of the lens system) x 2π - enables panoramic photography.

That is, when using the above structure, first, a part of the optical image of the object around the entire circumference is reflected by the first reflecting mirror, travels in the direction of the lens optical axis, passes through the image reversing prism located on the optical axis, and reaches the lens system. .

In this case, the first reflecting mirror and the image reversing prism are rotatable, and the lens system, the second reflecting mirror thereunder, and the slit window are fixed.

The light image that has passed through the lens system is reflected at 90° by the second reflecting mirror, passes through a slit window, and forms an image on the film surface that moves on the focal plane.

However, when the first reflecting mirror rotates by △ radians and the colossal image inverting prism rotates by radians, it passes through the lens system, is reflected by the second reflecting mirror, passes through the slit window, and appears on the film plane as part of the first surrounding object. An image of the object in the △ radian direction is created by rotating the first reflecting mirror.

This principle is the same as the principle of viewing the entire surrounding area with a telescope with a fixed eyepiece, so detailed explanation will be omitted, but it is generally similar to the law.

That is, the image of the object on the circumference reflected by the first reflecting mirror is further reflected by the second reflecting mirror and formed on the film through the slit window.

In this case, the image of the subject is vertically reversed when reflected by the first reflecting mirror, and the vertical and horizontal sides of the light image are reversed by the image reversing prism.Therefore, the horizontal and vertical lengths are reversed (up and down, reversed twice and returned to the original state). Since it is further inverted in the system, the light image here is one in which the vertical height is reversed with respect to the first incident light image.Furthermore, the top and bottom are reversed by the second reflecting mirror, so in the end there is a total thermal inversion on the film. An image of the subject that is not photographed will be formed.

Therefore, the image on the film is located at the first reflecting mirror.

When the doujin is rotated a spatula length, the area corresponding to the slit window of the real image of the subject (this is because the reflection is twice the angle of incidence) will be exactly the angle Δ Δ to the slit window in the direction in which the first reflecting mirror is rotated. Panoramic photography can be done by moving the film in sync with the movement of the image that has passed through the slit window, depending on the rotation of the reflecting mirror (3). This is because something will happen. In this case, when the first reflecting mirror rotates, it seems that the image on the slit is tilted, but this does not occur due to the refraction of the image reversing prism.

Incidentally, one of the reflecting surfaces of the first and second reflecting mirrors and the image reversing prism is a roof surface.

Therefore, the movement of the image on the focal plane due to the rotation of the first reflecting mirror by the small angle Δ is fΔ, where f is the focal length of the lens.

Therefore, since one rotation of the first reflecting mirror is 27r, radian, the amount of movement of the film corresponding to this one rotation is 2T.

Therefore, in this camera, the amount of film movement for one rotation of the first reflecting mirror is z7cf.

Panoramic photography is possible by fixing the two reflecting mirrors and the slit window and moving the film on the focal plane that has passed through the slit, so if necessary, change the film movement speed in proportion to the focal length of the lens. (It is also possible to obtain a panoramic camera with interchangeable lenses by using 4 lenses.

The basic structure of the panoramic camera of the present invention based on the principle described above is as shown in the drawings.

In the drawing, (1) is the first reflecting mirror and the lens system (2)
(3) is at an angle of 45° with the optical axis (it can be changed slightly if necessary) by rotating it around the optical axis at 1 of the rotational speed of the first reflecting mirror (1). Fixed lens system (2
) and below it, a second reflecting mirror (4) is installed at an angle of 45° with respect to the lens optical axis, and in front of the focal plane on the reflecting optical axis there is a slit window (5) and a film (6) that moves to the focal plane.
) is located.

However, the first reflecting mirror (1) and the image reversing prism (
The film (6) is interlocked by a gear system (not shown) so that the rotation ratio with the film (6) is 2:l, and the moving speed of the film (6) changes the focal length of the lens by the rotation of a sprocket or roller (not shown). At the end of the day - Reflector 1
The rotation of the sprocket or roller and the rotation of the first reflecting mirror are linked so that the film moves by 27ff with respect to rotation.

Also, the exposure time to the film (6) is the time for the film to pass through the slit window (5), and the moving speed of the film is 27r-, as described above, where W is the rotational angular velocity of the first reflecting mirror.
fW, so the exposure time t to the film is B th-/2XgoW, where 11 of the slit window is B.As can be seen from the formula F, as the slit width is increased, the exposure time becomes longer and W. This means that if it is large, it becomes small.

is about to go.

It also allows the lens system to be constructed to be exchangeable, and in this case, lens exchange and changes in film movement speed can be matched by a combination of a gear transmission.

The first reflecting mirror is installed at an angle of 45° to the optical axis of the lens, but this angle can be changed to a certain degree, for example, to photograph the entire circumference of the elevation angle or the entire circumference of the circumference angle. It is possible to do various things.

(7) Also, the film magazine can be made detachable, or the camera can be operated by charging a spring with the force of a spring, the force of a motor, or the force of a motor, and the operating part of the camera can be rotated by the force of the spring only when shooting. This can be implemented in any design by applying known means commonly used in conventional cameras.

The panoramic camera of the present invention as described above has a smaller moment of inertia than a panoramic camera that swings the entire camera or lens because the parts that rotate during shooting are concentrated on the rotation axis, so high-speed shooting is possible. This makes it possible to further benefit from lens exchanges, etc.

[Brief explanation of the drawing]

The drawing shows the principle of the panoramic camera of the present invention, and shows the principle of the panoramic camera of the present invention. (4)...Second reflecting mirror (8) (5)...Slit window (6)...Film patent applicant Hiroshi Mito

Claims (2)

[Claims] (1) A panoramic camera that has a first reflecting mirror, an image reversing prism, a lens system, a second reflecting mirror, a slit window, and a film moving device on one optical axis. (2) A camera according to claim (1) in which the image reversing prism is rotated at half the speed of the first reflecting mirror. (3) The focal length F of the lens system and the rotational speed W of the first reflecting mirror are Claim (1) in which the moving speed of the film is 27 nFW
and (2) Camera (4) Claims in which the lens system can be replaced and the moving speed of the film can be changed to (3) Camera (5) Claims in which the elevation angle of the first reflecting mirror can be changed. Cameras (1) to (4)