JPH0682634U - Real image finder - Google Patents

Abstract

(57) [Summary] [Purpose] It is installed in a camera that can switch screen sizes.
The information display is placed at a position conjugate with the image plane on which the field image is formed from the viewfinder objective lens, and the real image that allows the information on the information display and the field image to be simultaneously observed through the viewfinder eyepiece through the half mirror. Link the viewfinder to screen size switching. [Structure] By disposing a light-shielding member near the information display and moving the light-shielding member in conjunction with screen size switching, a part of the information on the information display can be observed at the same time as the visual field image is impossible. Switch to a different state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a viewfinder of a camera, and more particularly to a real image type viewfinder mounted on a camera whose screen size can be switched.

[0002]

[Prior art]

 In recent years, as a lens shutter camera, a camera that uses a zoom lens as a taking lens has become common. For this reason, when performing zooming according to the angle of view of the taking lens, it is possible to reduce the size and provide a clear view field image as long as the magnification is similar to that of an inverse Galilean finder that is a virtual image system. However, real-image viewfinders are increasingly used. In addition, since such a camera has an automatic focus detection mechanism built-in, it is necessary to display the distance measuring position near the center of the viewfinder, which is becoming more common in standard and panoramic cameras. Has also added a display indicating the shooting range during panorama shooting.

In a real image type finder, these displays are displayed by forming protrusions or depressions in a linear shape on the surface of a resin prism in the vicinity of the primary image surface, and by displaying only the distance measuring position. Similar to the above, for the shooting range during panorama shooting, a shading plate that can be moved or opened / closed is placed on the primary image plane, and during panoramic shooting, a part of the viewfinder image is blocked by this shading plate and the shooting range is displayed. What to do is already known.

On the other hand, a finder that arranges an information display plate on a conjugate plane equivalent to a primary image plane in a real image system and enables observation of the finder image and the information display plate at the same time by an illumination means such as a lighting window is an Asahi camera (Showa Showa). January 42, pp. 263-268), JP-A 1-26 6517, and the like.

However, regarding the standard and panoramic shooting range display, in the former configuration of the conventional technology, both ranges are constantly displayed in the viewfinder, so that even if the shooting range is switched, it can be recognized only by looking at the viewfinder. There is a problem that is easily misleading. On the other hand, in the latter configuration, the drive system has to be connected to the outside of the finder unit due to the operation of the light shielding plate, which may cause dust and other foreign matter to enter, especially in the case of the real image type. Dust on the surface is clearly visible, which is a problem.

[0006]

[Problems to be solved by the device]

 The present invention is a real-image viewfinder mounted on a camera with a switchable screen size, in which the change in screen size can be clearly seen in the viewfinder field, and dust that is a problem with the real-image system cannot be seen. The purpose is to obtain.

[0007]

[Means for Solving the Problems]

 The above-mentioned problem is solved by mounting the information display on a camera whose screen size can be switched according to the present invention, arranging the information display at a position conjugate with the image forming surface for forming a field image from the viewfinder objective lens, and transmitting the information through a half mirror. In a real-image viewfinder in which the information on the display and the field-of-view image can be observed simultaneously from the finder eyepiece, a light-shielding member is placed near the information display and the light-shielding member is moved in conjunction with screen size switching. Thus, a part of the information on the information display is switched between a state in which it can be observed and a state in which it cannot be observed simultaneously with the visual field image.

[0008]

【Example】

 The present invention will be described in detail with reference to FIGS. 1 is a basic configuration diagram of the finder of the present invention, FIG. 2 is an enlarged view of the target frame 11, FIG. 3 is an enlarged view of the light shielding plate 12, FIG. 4 is a viewfinder image when switching to a standard size, and FIG. This is the viewfinder image when switched to is.

Reference numeral 1 denotes an objective lens having a convex lens configuration for forming a real image of a subject, which is a zoom lens having a variable magnification. Reference numeral 2 is a first reflecting mirror, 3 is a second reflecting mirror, 4 is a field frame made of an opaque material and having an opening, and the subject light passing through the objective lens 1 is the first reflecting mirror 2 and the second reflecting mirror 3 And is imaged on the same plane as the field frame 4 which determines the standard image frame. The subject light imaged on the same plane as the field frame 4 is reflected by the semitransparent mirror 5 and the third reflecting mirror 6, and enlarged by the eyepiece 7 having a convex lens structure to be observed by the photographer. Reference numeral 11 denotes a target frame, which is arranged on a plane conjugate with the field frame 4 with respect to the semitransparent mirror 5. Reference numeral 12 denotes a light shielding plate that moves up and down according to the screen size switching of the camera body, and is provided in front of or behind the target frame 11. Reference numeral 13 is a fourth reflecting mirror, and 14 is a daylighting window, which allows external light to enter and illuminates the target frame 11 via the fourth reflecting mirror.

FIG. 2 is an enlarged view of the target frame 11, and FIG. 3 is an enlarged view of the light shielding plate 12. The target frame 11 is provided with four frame lines 11a for panorama size, a distance measuring mark 11b is provided at the center, and a P character 11c indicating the panorama mode is provided at the lower center of the display frame. Only the others are transparent and the others are made black and opaque.

When shooting in a standard size in the camera body, the light shielding plate 12 overlaps the target frame 11 as shown in FIG. Therefore, the portion of the target frame 11 illuminated by the daylighting window 14 is only the cutout portion 12a in FIG. 3, and as shown in FIG. 2, only the distance measuring mark 11b is illuminated in the target frame 11. As a result, the image that the photographer can observe through the eyepiece lens 7 is the subject image and the distance measuring mark 11b in the range defined by the field frame 4, and can be observed as shown in FIG.

When the camera body is switched to the panorama size, the light-shielding plate 12 is retracted below the target frame 11 by a commonly known means (not shown) in conjunction with the switching. As a result, the entire area of the target frame 11 is illuminated by the daylighting window 14, so that the image that the photographer can observe through the eyepiece 7 is the standard size image, as well as the frame line 11a for panorama size and P of the panorama mode. It is the letter 11c and can be observed as shown in FIG.

Note that the outside of the field of view that determines the standard image frame is black, and the image guided from the target frame 11 such as the frame line 11a appears white on the subject image, so switching between standard size and panoramic size is not possible. Clearly distinguishable in the viewfinder.

As another finder structure, 5 in FIG. 1 may be a reflecting mirror and 6 may be a semitransparent mirror, and the target frame 11, the light shielding plate 12 and the lighting window 14 may be provided in front of 6.

Furthermore, the present invention is not limited to switching between standard and panorama, and the pattern on the target frame is not limited to this embodiment.

[0016]

[Effect of device]

 As described above, in the real-image viewfinder, the field of view frame when switching between the standard size and the panorama size can be easily discriminated with a simple structure, any character image can be provided, and the subject image is aerial. Since there is no place to attach dust etc., the problem of seeing dust is solved.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of a finder of the present invention.

FIG. 2 is an enlarged view of a target frame 11.

FIG. 3 is an enlarged view of a light shielding plate 12.

FIG. 4 is a viewfinder image when switched to a standard size.

FIG. 5 is a viewfinder image when switched to a panorama size.

[Explanation of symbols]

 1 Objective Lens 4 Field Frame 5 Semitransparent Mirror 7 Eyepiece 11 Target Frame 12 Light-shielding Plate 14 Daylighting Window

Claims (1)

[Scope of utility model registration request] 1. An information display body, which is mounted on a camera whose screen size can be switched, is arranged at a position conjugate with an image forming plane for forming a field image from a viewfinder objective lens, and the information display body is placed on the information display body through a half mirror. In a real image type viewfinder in which the information and the visual field image can be simultaneously observed from the viewfinder eyepiece lens, a light blocking member is arranged in the vicinity of the information display body, and the light blocking member is moved in association with the screen size switching, whereby the information A real-image viewfinder characterized in that some of the information on the display is switched between a state in which it can be observed and a state in which it cannot be observed simultaneously with the visual field image.