JPS6126029A - Interchangeable lens having finder - Google Patents

Abstract

PURPOSE:To use easily an interchangeable lens having wide-range focal length in a camera other than single-lens reflex cameras, by providing the interchangeable lens directly with finders adapted to individual focal lengths. CONSTITUTION:A finder part 3' is provided directly on an interchangeable lens body 3 having a mount part 4'. A front frame 6 incorporating an object lens 5 is moved forward and backward together with the object lens 5 by a helicoid 9 to perform focusing when it is turned. A gear 7 of the front frame 6 bites a gear 12 provided on a finder lens frame 11 which is attached to the finder part 3' through a helicoid 10 and has an object lens 13 of the finder. Thus, the finder lens frame 11 is interlocked with focusing of a lens system due to turning of the frame 6, and a photographic system is focused by the focus detection due to the finder.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an interchangeable lens that eliminates the need to correct the field of view of the viewfinder in the camera when changing lenses or to mount a separate finder in cameras that use interchangeable lenses that are not single-lens reflex cameras. A finder suitable for each focal length is directly installed on the camera, so that when an interchangeable lens is attached to the camera, the eyepiece of the finder is located above the camera, so that the finder that matches the lens can be easily used by exchanging lenses. This book attempts to make it easy to use interchangeable lenses with a wide range of focal lengths on non-SLR cameras.

Figure 1 shows the gist of the present invention, in which 11) is a camera, and (4) is a mount on the camera side. The lens is mounted by pressing the lens against the lens and rotating the mount screw (4), but there are many mounts that can be mounted without rotating the lens barrel.

(21t; i) It is one of the interchangeable lenses to which a finder (2) matching the focal length of the lens is directly attached, and its eyepiece is located behind the mount part (41). As shown in Figure 2A, when combined with a camera, the eyepiece is located above the camera for easy viewing.

Also, (3) in Figure 1 is another interchangeable lens, which has (
Finder (3) and mount) as in case 2)
The state in which the t4i is attached to the camera is as shown in Figure 2B.

If the viewfinder eyepiece is located at the rear of the front door (on the camera side), you cannot use a mount that attaches to the camera by rotating the lens barrel. If necessary, if the viewfinder eyepiece is located in front of the front of the camera, it is also possible to use a rotating mount to position the viewfinder eyepiece above the camera so that it is not obstructed by the camera. be.

FIG. 3 shows an example in which distance adjustment of an interchangeable lens having a finder according to the present invention and distance adjustment of the finder are linked.

For example, if a Galilean optical system is used in the finder, the movement of the objective lens and the distance to the object will be correlated to some extent.

Therefore, by linking the movement of the objective lens in the finder with the movement of the objective lens on the photographing side, it is possible to achieve a certain degree of 8-point focusing, but this is not practical, especially when using high-speed film and increasing the calibration value. What you have is what you become.

In the figure, (3) is the main body of the interchangeable lens, +4) is the h mount section, and (3) is a part of the finder. The lens barrel contains an objective lens (5) and is fixed via a helicoid (9).

Fixed #! It has a front frame (6) that is combined with the tube (8), and by rotating the front frame, the helicoid (9) moves back and forth with the objective lens (5) to adjust the distance. A gear (7) is provided at the rear of the front frame, and the finder is attached to the finder part (3), which is attached to the fixed lens barrel (8), via a helicoid. The 7-finder lens frame (11) meshes with a gear (12) provided on a finder lens frame (11) having an objective lens, and is interlocked with the distance adjustment of the lens system by rotation of the lens frame (6).
It is possible to compensate for the shooting system by linking the camera and detecting actual odor using the viewfinder. In the figure, (14) is the eyepiece of the finder, (15) is the diopter adjustment screw of the eyepiece frame, and fi (16) is its lock screw.

In the figure, illustration of the shutter device and the like is omitted.

In the embodiment, a Galilean type optical system is used for the finder, but other optical systems may be used.

Also, of course, in the case of a zoom lens, a zoom finder is used, and the interlocking method for magnification is done by interlocking cams, etc., and the interlocking of the objective lens by adjusting the distance is done by using gears as mentioned above. This shall be based on interlocking, etc.

In this case, it is possible in any design to move the field frame of the camera, which requires vararax correction, in conjunction with the rotation of the objective lens.

The interchangeable lens with a finder of the present invention having the above-described structure can solve the problems associated with finding the finder when changing lenses in cameras with non-single-lens reflex interchangeable lenses. This makes it possible to provide interchangeable lenses that are not required.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and the first, second and second figures show the gist of the present invention, and the third figure is a cross-sectional view of the present invention. In the drawing (1)・・・・・・・・・・・・Camera ′＋
2) (31・・・・・・・・・・1 barrel of lens forceps (2
i (ai......Finder part +
41141・・・・・・・・・Mount (5)・
・・・・・・・・・・・・・・・Objective lens (5)...
・・・・・・・・・・Aperture (6)・・・・・・・・・・
・・・・・・Front frame (71 (12) ・・・・・・・
・・Gear (8) ・・Fixed lens barrel f9) 730 ・・・Helicoid (14) ・・・・・・・・・Eyepiece Oh ω Oni's talent' = 1 eye

Claims (2)

[Claims] (1) An interchangeable lens that has a finder such that the eyepiece of the finder is located above the camera when the interchangeable lens is attached to the camera. (2) The interchangeable lens according to claim (1), in which the movement of the distance adjustment lens of the lens barrel and the movement of the distance adjustment lens of the finder are linked.