JPH0756214A - Natural lighting type bright frame finder - Google Patents

Abstract

PURPOSE:To provide a natural lighting type finder capable of allowing a visual field frame to appear in a finder and overlapping the visual field frame with the image of an object, without providing a large-sized natural lighting window by lining up one end parts of lighting guides to the shape like the visual field frame and exposing the other end parts to the outside surface of camera. CONSTITUTION:One end parts of a suitable number of light guides 15 are lined up in a suitable shape to form a visual field frame display part 16 indicating the visual field frame. This display part 16 is provided so as to face the reflecting surface of the half mirror 13 of a finder optical system. The other end parts of the light guides 15 are exposed to the outside surface of the camera to form a lighting part. Light entering from the natural lighting part passes through the light guides 15 and is emitted from the visual field frame display part 16, so that the visual field frame appears on the half mirror 13 and is overlapped with the image of the object. Since the light guides 15 are flexible and have a small-diameter, the natural lighting part is provided on an arbitrary part on the outside surface of the camera and interference with a sensor window for automatic focusing, etc., can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a daylighting bright frame finder which is a finder attached to a camera.

[0002]

2. Description of the Related Art A daylighting bright frame finder is
A field frame image obtained by illuminating a field frame with external light is taken in the middle of the finder optical system, and the field frame image and the image of the object are superimposed to determine the composition of the object. The structure of a conventional daylighting bright frame finder is shown in FIG. Objective lens 1 for finder optical system
The half mirror 3 is interposed between the lens and the eyepiece 2. In addition to the finder optical system, an optical system for floating the visual field frame as an optical image is provided. The optical image optical system uses outside glass to collect outside light from a daylighting window 4 provided on the front surface of the camera, The field frame plate 5, which is transparent only at the portion 5a, is illuminated. This field frame 5a
This image is reflected by the reflecting mirror 6 at a substantially right angle, transmitted through the intermediate lens 7, forms a virtual image of the field frame 5a, and is superposed on the image of the subject by the half mirror 3 of the finder optical system.

FIG. 8 is a schematic front view of a camera provided with a conventional daylighting type bright frame finder. The daylighting window 4 is provided on the front surface of the camera adjacent to the finder window 8 in front of the objective lens 1. There is.

[0004]

However, the above-mentioned conventional daylighting type bright frame finder has the following problems. As shown in FIG. 7, the half mirror 3
Only the portions of the field frames 5a formed at the four corners of the field frame plate 5 are imaged on the upper side, whereas the entire field frame plate 5 is illuminated from the lighting window 4. Therefore, the size of the daylighting window 4 is substantially the same as the size of the field frame plate 5. Therefore, as shown in FIG. 8, the daylighting window 4 which is slightly smaller than the finder window 8 is disposed on the side of the finder window 8.

In the conventional daylighting type bright frame finder, since the daylighting window 4 slightly smaller than the finder window 8 is provided on the side of the finder window 8 as described above, for example, an autofocus sensor window or the like. Since the space for arranging the camera is limited, the external design of the camera is restricted. Moreover, since the visual field frame plate 5 and the reflecting mirror 6 are disposed behind the daylighting window 4, it is necessary to secure a space for disposing the visual field frame plate 5 and the reflective mirror 6 in the internal structure of the camera. Because it won't
The degree of freedom in designing the functions of the camera and the layout of the parts for the functions is limited.

The daylighting window 4 needs to be provided in front of the camera in order to make the daylighting conditions good. For example, when it is installed on the top surface of the camera, when the photographer looks into the viewfinder, the photographer's head covers the camera and blocks the lighting window, or when the photographer wears a hat. This is because the eaves may cover the upper surface of the camera and block the daylighting window.

Therefore, according to the present invention, it is possible to reliably form a field frame image on the half mirror of the finder optical system without the need for a conventional daylighting window provided on the side of the finder window. The purpose is to provide a bright frame finder.

[0008]

As a technical means for achieving the above-mentioned object, a daylighting type bright frame finder according to the present invention is arranged with one end of a suitable number of light guides as a mark of a field frame. The light guide frame is formed as a visual field frame display portion, and one end portion of the visual field frame display portion is arranged so as to face the reflective surface of the half mirror of the finder optical system, and the other end portion of the light guide is appropriately provided on the outer surface of the camera. It is characterized in that it is used as a daylighting section that is exposed to a position to capture outside light, and an optical image emitted from the visual field frame display section is superimposed on the image of the subject on the half mirror.

For example, when the visual field frame is displayed by combining four substantially L-shaped marks, one mark is made substantially L-shaped by properly aligning one end of a plurality of light guides. Forming the display,
The other ends of the plurality of light guides are bundled into one and exposed at an appropriate position such as the front surface of the camera to serve as a daylighting unit for capturing outside light. This is formed for each of the four field-of-view frame display portions to form four daylighting portions on the outer surface of the camera.

Further, in the case of a camera that requires parallax correction or change of the photographing field angle, for example, a camera having a panoramic photographing function, a visual field frame for panoramic photographing is formed in addition to the visual field frame for standard photographing. . In this case, eight visual field frame display portions including a visual field frame display portion including four marks forming the standard visual field frame and a visual field frame display portion including four marks forming the panoramic visual field frame are formed, and Eight lighting parts are exposed on the front surface. Then, in the standard shooting mode, the daylighting section of the field of view frame display section forming the panoramic field of view frame is blocked, and in the panoramic shooting mode, the daylighting section of the field of view frame display section forming the standard field of view frame is blocked. .

Further, the light guide forming one field frame display section is divided into two parts, which are bundled and one is exposed to the front of the camera to serve as a daylight section, and the other is provided outside or inside the camera. It may be arranged so as to face the auxiliary light source, and when outside light is not sufficiently incident on the daylighting section, an optical image of the field frame display section can be formed by the auxiliary light source.

[0012]

The external light incident from the daylighting section passes through the light guide and is emitted from the field frame display section. Since the field frame display section is formed by arranging one end of the light guide in the shape of a mark for displaying the field frame, the light emitted from the field frame display section forms the shape of the field frame display section. . Since the field frame display section is arranged so as to face the reflecting surface of the half mirror of the finder optical system, the optical image of the field frame display section is formed on the half mirror together with the image of the subject.

Since the light guide can be arranged relatively freely, it does not require a lighting window of a conventional daylighting type bright frame finder, and has a small diameter opening for exposing the lighting part of the light guide to the front surface of the camera or the like. Should be formed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A daylighting type bright frame finder according to the present invention will be specifically described below with reference to the embodiments shown in FIGS.

FIG. 1 is a perspective view showing an essential part of the daylighting type bright frame finder, and the finder optical system is composed of an objective lens 11, an eyepiece lens 12 and a half mirror 13 as in the conventional one. An intermediate lens 14 is provided facing the reflecting surface of the half mirror 13. An appropriate number of light guides 15 are arranged facing the intermediate lens 14.

As shown in FIG. 2, one end portion of the appropriate number of light guides 15 is arranged in a substantially L-shape at the positions showing the four corners of the field frame, and one end portion of these light guides 15 forms a substantially L-shape. 4 field frame display parts 16a, 16b,
16c and 16d are formed. Then, the light guides 15 are bundled for each of the visual field frame display portions 16a, 16b, 16c, 16d and pass through an appropriate position inside the camera 10, and the other end portion of the camera 10 as shown in FIG. It is exposed on the front surface and serves as lighting units 17 and 19. This lighting section 17a, 17b, 17c, 17d
Respectively communicate with the field frame display portions 16a, 16b, 16c, 16d. The daylighting units 19a, 19b, 19c, and 19d communicate with a panoramic field frame display unit that forms a panoramic field frame described later.

Further, in FIG. 3, a photographing lens 21 is arranged at the center of the front surface of the camera 10, a finder window 22 is arranged above the photographing lens 21, and the daylighting portions 17 and 19 are connected to the photographing lens 21. It is arranged almost linearly with the finder window 22. In addition, a sensor window with a distance measuring sensor (not shown) for autofocus facing both sides of the finder window 22.
23 are provided. Furthermore, a stroboscopic light emission window 24 is provided at one end on the front surface of the camera 10.

As shown in FIG. 4, the lighting parts 17 and 19 of the light guide 15 are exposed from the opening 10b formed in the casing 10a of the body of the camera 10, and the lighting parts 17 and 19 are obliquely upward. It is desirable to direct it so that it can exhibit sufficient characteristics for capturing external light.

When a subject is captured by the camera equipped with the daylighting type bright frame finder, the outside light is incident from the daylighting section 17 and the incident light passes through the light guide 15 and the field frame display section 16 is provided. Shoot out from. This emitted light forms an image on the half mirror 13 of the finder optical system. Since the field-of-view frame display unit 16 is formed as a mark that forms the field-of-view frame, the image of the field-of-view and the image of the field-of-view overlap on the half mirror 13, so that the composition of the object can be easily determined. it can.

FIG. 5 shows the field-of-view frame display units 16a, 1 for standard photography.
6b, 16c, 16d and field frame display sections 18a, 18 for panoramic shooting
In the figure, b, 18c, and 18d are shown, and the case where one light field frame display section 16 and 18 is constituted by 16 light guides 15 is shown. Then, as described above, the visual field frame display portions 16a, 16b, 16c, 16d are the daylighting portions 17a, 17b,
Field-of-view frame display units 16a, 16b, 16 by communicating with 17c, 17d and receiving external light from the daylighting units 17a, 17b, 17c, 17d.
Light is emitted from c and 16d. In addition, the field frame display units 18a, 18
b, 18c, 18d communicates with the daylighting sections 19a, 19b, 19c, 19d, and external light enters from the daylighting sections 19a, 19b, 19c, 19d so that the visual field frame display sections 18a, 18b, 18c, 18d. Light is emitted from. Therefore, in the standard shooting mode, the lighting unit
19a, 19b, 19c, 19d are shielded from light, and when the panoramic shooting mode is used to shield the daylighting units 17a, 17b, 17c, and 17d, in the standard shooting mode, the field-of-view frame display unit 16a for standard shooting,
Only 16b, 16c, and 16d appear in the viewfinder, and when in panorama shooting mode, the field frame display section for panorama shooting 18
Only a, 18b, 18c and 18d will appear in the viewfinder. As shown in FIG. 3, the lighting parts 17 and 19 are arranged on the front surface of the camera in a substantially straight line. Therefore, a light shielding plate (not shown) slidable along the straight line is used. , 19
Of the daylighting part 17 or the daylighting part 19 depending on the sliding position. By interlocking this sliding of the shading plate with the switching operation of the shooting mode to shield the daylighting section 19 in the standard shooting mode and the daylighting section 17 in the panoramic shooting mode, only the field frame corresponding to the shooting mode is provided. It can be displayed in the viewfinder.

Further, FIG. 6 shows a configuration in which the field frame is surely exposed even when photographing is performed at night or in a dark place. In this case, for example, the light guide 15 constituting the field frame display section 16a is divided into two, and one of them is a daylighting section 17a.
The outside light is captured as a and the other side is the auxiliary lighting unit 17
Let k. Then, the auxiliary lighting part 17k is exposed to the auxiliary light source 25 provided inside or outside the camera. When shooting at night or in a dark place, by turning on the auxiliary light source 25 and capturing the auxiliary light by the auxiliary lighting section 17k,
The field frame display section 16a can be displayed appropriately.

In the present embodiment, the case where the light guide is used for the field frame display section has been described, but the light guide is also used for the target mark indicating the range of the autofocus function displayed in the field of view of the finder. Can be displayed.

[0023]

As described above, in the daylighting type bright frame finder according to the present invention, one end portion of the light guide is appropriately arranged to form a visual field frame display portion, and the visual field frame display portion is formed by a half of the finder optical system. The light guide is provided so as to face the reflecting surface of the mirror, and the other end of the light guide is exposed at an appropriate position of the camera to form a light-collecting unit. The light image of the field-of-view frame display section is emitted from the above-mentioned field-of-view frame display section to form an image on the half mirror. Therefore, the state in which the image of the subject and the image of the field frame overlap can be confirmed with the finder.

Further, since the light guide is flexible and has a small diameter, it does not require a daylighting window as in the prior art, and the above-mentioned daylighting part can be exposed at any position of the camera, and distance measurement for autofocusing is possible. The lighting unit can be arranged without interfering with the sensor or the sensor window.

Further, by blocking the daylighting section, the visual field frame display section can be prevented from being displayed, and since the lighting section can be shielded by a simple structure, parallax correction and change of the photographing field angle are performed. For example, a field frame for standard shooting and a field frame for panoramic shooting are separately provided, and only one of the field frames corresponding to the shooting mode is displayed in the viewfinder by blocking one of the lighting sections. The structure can be easily made. Therefore, the composition of the subject will not be determined by the wrong visual field frame at the time of shooting.

[Brief description of drawings]

FIG. 1 is a schematic perspective view for explaining the structure of a daylighting bright frame finder according to the present invention.

FIG. 2 is a schematic perspective view showing a visual field frame display portion which constitutes a visual field frame of the daylighting type bright frame finder according to the present invention.

FIG. 3 is a schematic front perspective view of a camera equipped with a daylighting bright frame finder according to the present invention.

FIG. 4 is a partial cross-sectional view for explaining a daylighting section.

FIG. 5 is a schematic layout diagram of a field frame for standard imaging and a field frame for panoramic imaging.

FIG. 6 is a side view showing a daylighting part, which is a view for explaining a structure in which the daylighting bright frame finder according to the present invention allows daylighting from both external light and an auxiliary light source.

FIG. 7 is a perspective view illustrating the structure of a conventional daylighting type bright frame finder.

FIG. 8 is a schematic front perspective view of a camera including a conventional daylighting bright frame finder.

[Explanation of symbols]

 10 Camera 11 Objective lens 12 Eyepiece 13 Half mirror 14 Intermediate lens 15 Light guide 16a, 16b, 16c, 16d View frame display (for standard shooting) 17a, 17b, 17c, 17d Daylighting part (for standard shooting) 17k Auxiliary lighting Parts 18a, 18b, 18c, 18d Field-of-view frame display section (for panoramic shooting) 19a, 19b, 19c, 19d Lighting section (for panoramic shooting) 21 Photographing lens 22 Finder window 23 Sensor window 24 Strobe flash window 25 Auxiliary light source

Claims (1)

[Claims] 1. An appropriate number of light guides are arranged at appropriate positions to form a field frame or a mark such as a target mark to form a field frame display section, and the field frame display section is formed at one end of the viewfinder optical system. An optical image emitted from the view frame display section, which is arranged so as to face the reflecting surface of the half mirror, and exposes the other end of the light guide to an appropriate position on the outer surface of the camera to capture outside light. A daylighting bright frame finder in which the image of the subject is superimposed on the half mirror.