JPS6084537A - Camera - Google Patents

Abstract

PURPOSE:To unite a lens barrel and a camera body and to reduce in size by providing a roof mirror behind the lens barrel and setting a film surface in parallel to the optical axis of a lens. CONSTITUTION:This camera forms an image of a subject on the film surface 4 through a right-angle roof prism (or reflecting mirrors combined at some angle) behind the lens barrel 2. The roof mirror is used to obtain the image in an up- down and right-left normal state. The outward shape space occupying the majority of the camera of this structure is LXBXT (or diameter D of lens). Consequently, the ratio of (height of camera) to (thickness of camera or lens diameter), i.e. the occupying space is 1/3-1/2 as large as that of a conventional camera.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a Danno prism (including reflective mirrors combined in a mountain shape) that converts the optical path to a right angle between the lens barrel and the film surface, and the film surface is connected to the optical axis of the lens. In addition, the film winding shaft and film magazine are similarly positioned parallel to the optical axis of the lens, and the planar part of the camera body and lens barrel are designed to reduce the size of the camera and improve operability. be.

In conventional single-lens reflex cameras, cameras with zoom lenses, telephoto lenses, etc. have a lens barrel protruding from the side of a roughly thick, rectangular camera body, and its approximate shape is shown in Figure 1. It is as shown in .

In the figure, (1) is the camera body, and (2) is the lens barrel, which is approximately LxBxH.In contrast, the basic structure of the camera of the present invention is the lens barrel (2) as shown in Figure 2. At the rear of 2), an image of the subject is formed on the film surface (4) via a right-angled roof prism (or a reflector combined in a mountain shape) (3), and this reflector simply captures 90° light. If the axis is changed, the image on the film will be opposite left and right, but by using a roof prism, the image will be normal vertically and horizontally.

Bx (T or lens diameter D), which is the ratio of camera height) to (camera thickness or lens diameter) compared to the conventional camera shown in Figure 1, and the space it occupies is 1/
It brings about a number bundle that can be 3 to 1/2.

In addition, when hand-held shooting, the main body of a conventional camera is held in the hand in a rope-like manner, whereas the camera of the present invention has the advantage of being easier to hold because the camera main body can be held in the hand in a horizontal position like binoculars. It is.

Figure 4 shows the structure of a camera in accordance with the present invention when a single-lens reflex finder is installed in the optical system.
2) Make the reflective surface (5) of the rear roof prism semitransparent or partially transparent, and attach a prism (10) with the same refractive index behind the roof prism so that light can travel straight through this surface. Focus glass (6) Pentaprism (7)
, a mirror (8), and an eyepiece (9).

In addition, in the camera of the present invention, the camera body, which was conventionally located perpendicular to the optical axis (3) of the lens barrel, can be positioned parallel to the lens barrel, but the structure inside the camera is almost the same as the conventional one. This makes it possible to use a structure similar to that of a camera.

As described above, according to the structure of the camera of the present invention, the lens barrel and the camera body can be integrated into one body, which brings about advantages such as miniaturization.

[Brief explanation of the drawing]

The drawings are for explaining the present invention; the first figure shows the general shape of a conventional camera, the second figure shows the basic structure of the camera of the present invention, and the third figure shows the camera of the present invention. FIG. 4 shows the optical system of the finder of the camera of the present invention. Patent applicant: Hiroshi Mito (4)

Claims (3)

[Claims] (1) A camera with a roof prism installed behind the lens barrel so that the film surface is parallel to the lens optical axis. (2) A camera according to claim (1) in which the film winding shaft and film magazine are arranged parallel to the lens optical axis. (3) The reflecting surface of the Dunno prism is semi-transparent or partially transparent, and a focusing glass and a municipal optical system are provided behind it to constitute a finder.
) and (2) cameras