JPS5838778B2 - lens switching camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a long focal length lens, that is, a telephoto lens, and a short focal length lens, that is, a wide angle lens, which are always attached to face toward the subject, and the lens used for photographing can be adjusted by moving a reflecting mirror. This invention relates to a camera with a new lens switching type that switches between lenses.

The definitions of telephoto and wide-angle here only refer to the relative relationship between the two, and also include combinations of so-called telephoto lenses and standard lenses, or combinations of so-called telephoto lenses and standard lenses and wide-angle lenses.

Inexpensive small-sized camera cameras are commercially available that have a built-in telephoto lens and a wide-angle lens, and a desired lens can be inserted into the optical path for photographing.

This is because, in addition to the small size of the lens itself, it has a single-element structure and is lightweight, and the aperture is fixed, so it was easy to use a movable structure within the camera, but the camera was rather large. If you use a high-quality, large-diameter mechanical lens, the lens will be large and heavy, and if you use a variable aperture, the adjustment mechanism will require a moving structure like the one mentioned above. It becomes difficult to hire.

This invention aims to realize a camera that can easily select and use a desired one of two lenses even when a large and heavy lens or a variable aperture is used. purpose.

The present invention will be explained below based on illustrated embodiments.

In FIG. 1, reference numeral 1 denotes a dark box of a camera, on the front of which a telephoto lens 2 and a wide-angle lens 3 are provided, both facing in the same direction.

Behind the wide-angle lens 3 is a focal plane shutter 4.
and a photosensitive plate 5 are installed.

Reference numeral 6 denotes a reflecting mirror, which is installed behind the telephoto lens 2 and which directs the optical axis 7.
The light passing through the telephoto lens 2 along is reflected at right angles.

A reflecting mirror 8 is provided between the wide-angle lens 3 and the shutter 4, and reflects the light reflected by the reflecting mirror 6 along the optical axis 7 at a right angle to direct it toward the photosensitive plate 5.

Reference numeral 9 denotes a light shielding plate that is in close contact with the inner surface of the wide-angle lens 3, and is integrally connected to the reflecting mirror 8.

Here, the reflecting mirror 8 and the light shielding plate 9 are installed so as to be movable to the positions indicated by dotted lines.

In the above-mentioned camera, when the reflecting mirror 8 and the light-shielding plate 9 are in the position shown by the solid line, the light passing through the telephoto lens 2 is reflected twice by the reflecting mirrors 6 and 8, and passes along the optical axis 7 to the photosensitive plate. 5
reach.

At this time, since the wide-angle lens 3 is blocked by the light shielding plate 9, unnecessary light rays will not enter the dark box 1 through this.

Next, when the reflecting mirror 8 and the light shielding plate 9 are moved to the positions shown by the dotted lines, the light that has passed through the wide-angle lens 3 along the optical axis 10 reaches the photosensitive plate 5 as it is.

At this time, the telephoto lens 2 is blocked by the light shielding plate 9 to prevent unnecessary light from entering through the light shielding plate 9.

In the embodiment shown in FIG. 2, the wide-angle lens 3 of the telephoto lens 2
The distance between the mirrors is larger than that shown in the first figure, and the reflecting mirror 8 is not accompanied by a light shielding plate 9.

When using the wide-angle lens 3, the reflector 8 was moved to a position where it almost overlapped with the reflector 6 in the case shown in the first diagram, but in this embodiment, the telephoto lens 2 and the wide-angle lens are moved as shown by dotted lines. It is configured to move to an intermediate position between 3 and 3.

In the camera shown in the second figure, photographing by the telephoto lens 2 is carried out along the optical axis γ which passes through the reflecting mirrors 6 and 8 and reaches the photosensitive plate 5.
occluded by

Further, photographing using the wide-angle lens 3 is performed along the optical axis 10 after moving the reflecting mirror 8 to the position shown by the dotted line, and unnecessary light rays incident from the telephoto lens 2 are blocked by the reflecting mirror 8.

As is clear from the above explanation, according to the present invention, the taking lens can be replaced by simply moving the reflector without moving the taking lens, making it possible to use a large-diameter mechanical lens or a variable aperture. It's extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of another embodiment. 2... Long focus lens, 3... Short focus lens, 5... Photosensitive plate, 6... First reflecting mirror, 8... ...Second reflecting mirror, 9... Light shielding plate.

Claims (1)

[Claims] 1. A relatively long focal length lens and a relatively short focal length lens, both of which are placed facing toward the subject, a photosensitive plate located behind the short focal length lens, and a photosensitive plate located behind the long focal length lens, and a relatively short focal length lens located behind the long focal length lens. a first reflecting mirror that bends the light that has passed through the focusing lens in the direction of an optical path that passes through the short focal length lens and heads toward the photosensitive plate; and an inside of the optical path that passes through the short focal length lens and heads toward the photosensitive plate. A lens switching camera comprising a second reflecting mirror that is movable forward and backward, and further bends the bent light of the first reflecting mirror toward the photosensitive plate when the second reflecting mirror advances.