JPH0764157A - Lighting type finder structure for camera - Google Patents

Abstract

PURPOSE:To provide a lighting type finder structure where a lighting mirror is installed at the upper part of a camera in order to miniaturize a lighting type finder and light from an object is taken in so as to secure the minimum brightness of a visual field frame. CONSTITUTION:A finder optical system S1 is constituted of an objective lens 10, an ocular 12, and a half mirror 14 disposed between them. A reflector 16 is disposed on the side of the half mirror 14 and a visual field frame plate 18 is arranged above the reflector 16, then a visual field frame mark 18a, etc., are shown on the plate 18. A lighting window 20 made of frosted glass is disposed above the plate 18 so as to intercept the image of the light taken in. The lighting mirror 22 is disposed above the window 20 so that it appears the upper part of a camera main body and it is freely opened/closed to be an unused state where it is nearly horizontally closed with an axis at a side on a rear side and a used state where it is opened upward at about 4$. When it is opened, the light from the object is taken in and irradiates the visual field frame, and joins with the finder optical system S1 through the lighting type optical system S1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a daylighting finder for illuminating a field frame in a finder of a camera with light collected by a daylighting optical system.

[0002]

2. Description of the Related Art A camera is equipped with a viewfinder so that a photographer can confirm a photographing screen. As shown in FIG. 4, the finder 1 has a finder optical system S _f , and the finder optical system S _f includes an objective lens 2 facing an object (not shown) and an eyepiece 3 for taking a photographer's eye.
And a half mirror 4 arranged between the objective lens 2 and the eyepiece lens 3.

A daylighting window 5 formed of frosted glass is provided adjacent to the objective lens 2, and the light collected through the daylighting window 5 irradiates a field frame plate 6 behind it, and The light is reflected by the reflecting plate 7 on the rear side and is incident on the half mirror 4. A daylighting optical system S ₁ is configured by the daylighting window 5, the field frame plate 6, the reflection plate 7, and the like.

The finder optical system S _f and the daylighting optical system S _l
The finder 1 having and is called a daylighting finder. According to this daylighting finder, a field frame showing a photographable range is superimposed on the image of the subject of the finder optical system S _f , and the field frame is displayed with high brightness when the photographer looks into the finder 1.

A distance measuring element 8 for autofocusing is disposed on the side of the finder 1 to emit and receive infrared rays during the distance measuring operation.

[0006]

However, in the above-mentioned daylighting finder, the daylighting optical system S ₁ is arranged on the side of the finder optical system S _f , and the daylighting window 5 is arranged adjacent to the objective lens 2. Since it is provided, it may hinder the reduction of the width of the camera body, resulting in an increase in size of the camera. Here, it is conceivable to employ an albada type finder in order to reduce the size of the finder portion, but not only the brightness of the field frame is not sufficiently obtained, but also the finder becomes hard to see due to flare due to the half mirror.

Further, in order to reduce the width of the camera body, a structure in which a daylighting window of the daylighting optical system S _l is arranged on the upper surface of the camera body can be considered. According to this structure, by irradiating field frame by lighting the light from above it can be incident on the half mirror 4 of the finder optical system S _f, the lighting optical system on the side of the finder optical system S _f S Since it is not necessary to provide _l , the width of the camera body can be shortened.

However, in the above-mentioned structure in which the lighting window is arranged on the upper surface of the camera body, there is no problem if the light source such as sunlight is above when shooting, but the position of the lighting window may be sufficient depending on the shooting conditions. There are cases where the irradiation is not performed, and even when irradiation is performed, the irradiation angle is almost horizontal. For example, there is a case where the light from above is blocked by the photographer's hair, a hat, or the like, or a case where almost no light is emitted from above when shooting a sunset scene or the like.

In these cases, the daylighting optical system S _l cannot satisfactorily illuminate, and it becomes difficult to project the field frame in the viewfinder sufficiently brightly. If the image is not displayed sufficiently bright, it may be difficult to reliably determine the shooting range, and the shooting opportunity may be missed.

Therefore, it is an object of the present invention to provide a daylighting type finder structure which can miniaturize the finder structure and can secure the minimum brightness of the field frame.

[0011]

In order to achieve the above-mentioned object, a daylighting finder structure of a camera according to the present invention includes a viewfinder optical system for capturing an image of a subject and a light collecting means for collecting light from the subject. In the daylighting finder structure in which the finder optical system and the daylighting optical system merge and the image of the subject and the fieldlight frame overlap each other, the daylighting means is a camera. It is characterized in that it is arranged on the upper part of the main body, and the lighting means is constituted by a reflecting member which is rotatable between its used state and its unused state.

[0012]

When the finder is used, the reflecting member arranged on the upper part of the camera body is rotated to bring it into a usable state in which it can illuminate. Then, the image of the subject located in front of the camera is captured by the viewfinder optical system, and the photographer looks into the viewfinder to confirm the image of the subject.

At this time, the light from the subject is sampled by the reflecting member, and the light illuminates the field frame and joins the viewfinder optical system through the daylighting optical system. Therefore, the image of the subject and the field frame are superposed, and the field frame is displayed with high brightness when the photographer looks through the viewfinder.

Further, when the finder is not used after the photographing is finished, the reflecting member is rotated to bring it into a non-use state in which it is impossible to illuminate.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The lighting finder structure according to the present invention will be specifically described below with reference to the illustrated embodiments. In this embodiment, the case where the above-mentioned daylighting finder structure is used in a compact camera equipped with an autofocus device is described.

As shown in FIG. 1, the finder optical system S _f
Is composed of an objective lens 10 facing an object (not shown), an eyepiece lens 12 to which a photographer makes eye contact, and a half mirror 14 disposed between the objective lens 10 and the eyepiece lens 12 and directed obliquely to the side. ing.

A reflection plate 16 is provided laterally of the half mirror 14 and is directed obliquely upward, and a field frame plate 18 is arranged substantially horizontally above the reflection plate 16. A substantially L-shaped visual field frame mark 18a is shown at the four corners of the visual field frame plate 18, and a target mark 18b is shown at the center thereof, and these visual fields form a visual field frame. In addition, finder information such as a signal indicating that the strobe has been charged and a panoramic shooting mode can be displayed.

A daylighting window 20 formed of frosted glass is provided above the field frame plate 18, and the daylighting window 20 blocks the transmission of an image of the light that is collected, and the field frame plate 18 is provided.
Illuminate almost white light.

Above the daylighting window 20, a daylighting mirror 22 as a reflecting member is arranged with its reflecting surface facing downward. As shown in FIG. 2, the daylighting mirror 22 is exposed at the upper part of the camera body 24, and is swung about the rear side as an axis so that the daylighting mirror 22 is in a non-use state in which it is substantially horizontally closed and is opened approximately 45 degrees above. It can be opened and closed depending on the condition of use. The opening and closing of the lighting mirror 22
In a camera in which the main switch (not shown) of the camera body 24 can be interlocked or the lighting mirror 22 can be opened and closed independently, and the main switch is turned on and off by opening and closing the lens barrier, the lens barrier It can be linked to the opening and closing of.

Then, the above-mentioned daylighting mirror 22 and daylighting window 2
0, the field frame plate 18 is constituted the lighting optical system S _l by the reflecting plate 16, the lighting optical system on the half mirror 14 S _l
And the finder optical system S _f are merged.

As shown in FIGS. 1 and 2, a distance measuring element 26 for autofocusing is provided on the side of the objective lens 10.
Are provided, and infrared rays are projected and received during distance measurement.

The operation of the embodiment of the daylighting finder structure according to the present invention constructed as above will be described below.

As shown in FIG. 2, when the main switch of the camera is off, the lighting mirror 22 is in a substantially horizontal closed state and is in an unused state. At this time, when the main switch is turned on, the daylighting mirror 22 swings about the rear side as an axis, and is in a use state in which it is opened at about 45 degrees upward.

When the photographer directs the camera toward the subject, the image of the subject is converted into the objective lens as shown in FIG.
The light passes through the 10, the half mirror 14 and the eyepiece lens 12, and is captured by the photographer.

At this time, the light from the subject is collected by the light collecting mirror 22, and this light is reflected downward to form a light collecting window.
Irradiate 20. Since the daylighting window 20 is formed of frosted glass, it blocks the transmission of an image of light and lowers the field frame plate 18 below.
Illuminate almost white light. As a result, the daylighting optical system S
_l will not capture the image of the subject,
It is possible to prevent the image of the subject from being displayed twice.

The white light transmitted through the field frame plate 18 is a reflection plate.
It is reflected by 16 and enters the half mirror 14.
As a result, the illuminated display of the field frame plate 18 is superimposed on the image of the subject, and is captured by the photographer. That is,
The field frame mark 18a and the target mark 18b shown on the field frame plate 18 are displayed with high brightness, and the photographer can confirm the photographing range of the subject while observing these displays.

When the main switch is turned off after the photographing is finished, the lighting mirror 22 is closed substantially horizontally. Therefore, when the main switch is turned off, since the lighting mirror 22 does not project, the camera body 24 becomes compact, and the lighting mirror 22 does not hinder transportation or storage.

According to the present embodiment, since the light-collecting optical system S ₁ is arranged behind the distance measuring element 26 for autofocus arranged on the side of the objective lens 10, the distance measuring element 26 is arranged behind the distance measuring element 26. Space can be used effectively, contributing to the miniaturization of cameras.

Further, since the daylighting window 20 is formed of frosted glass, it is possible to prevent the internal structure from being seen from outside the camera body 24 through the daylighting window 20. For this reason,
The internal structure of the camera can be seen so that it does not look bad.

In this embodiment, as shown in FIG.
The structure using the daylighting mirror 22 that opens and closes almost at the center of the upper part of the camera body 24 as the reflecting member
Any other structure may be used as long as it is on the upper part of the above and collects light from the front.

For example, as shown in FIG. 3, a strobe device of a camera having a retractable strobe device 30 is used.
A structure in which the lighting mirror 32 is built into the 30 can be considered. In this structure, a lighting mirror 32 that is directed obliquely downward is provided integrally with a position adjacent to the strobe light emitting section 34, and the turning on and off of the strobe device 30 linked to the main switch opens and closes the lighting mirror 32. According to this structure, since the existing strobe device can be used, there is no need to newly attach a member for opening and closing, and the cost for improvement does not increase.

Further, instead of the structure in which the retractable strobe device 30 is provided with the lighting mirror 32 as in this embodiment, for example, a structure in which a rotatable lighting mirror is interlocked with a vertically moving strobe device is used. It doesn't matter.

[0033]

As described above, according to the daylighting finder structure of the present invention, since the daylighting means for collecting the light for irradiating the field frame of the finder is arranged above the camera body, the finder optical system It is not necessary to dispose the daylighting optical system side by side, and the width of the finder structure and the camera body can be shortened. Therefore, it contributes to downsizing of the camera body.

Further, since the daylighting means is composed of a rotatable reflecting member, it is possible to freely set the direction of light collection within a freely rotatable range. Therefore, it is possible to select and illuminate strong light regardless of the position of the subject.
Even if the upper part of the camera body is not illuminated or the subject itself is not bright, the minimum amount of light for illuminating the field frame is secured. Therefore, the field frame is always displayed with high brightness, and the photographer can easily confirm the photographing range.

Furthermore, since the use state and the non-use state of the daylighting means are clearly separated by the rotation of the reflecting member,
It is possible to prevent erroneous operations during shooting.

The daylighting finder structure according to the present invention does not impair the advantages of a general daylighting finder. Therefore, a bright field frame can be obtained at low cost, and the price and performance of the camera can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a daylighting finder structure according to the present invention.

FIG. 2 is a perspective view of a camera body including a daylighting finder.

FIG. 3 is a perspective view of a camera body in which a reflecting member is incorporated in a strobe device.

FIG. 4 is a schematic plan view showing the structure of a conventional daylighting finder.

[Explanation of symbols]

10 Objective lens 12 Eyepiece 18 Field frame plate 18a Field frame mark (field frame) 22 Daylighting mirror (reflection member) 32 Daylighting mirror (reflection member) S _f Finder optical system S _l Daylighting optical system

Claims (1)

[Claims] 1. A finder optical system for capturing an image of an object and a daylighting optical system for illuminating a field frame by collecting light from the object by a daylighting means, and the viewfinder optical system and the daylighting optical system are provided. In a daylighting finder structure in which the image of the subject and the field frame are superimposed upon each other, the daylighting means is disposed above the camera body, and the daylighting means is rotated between its use state and non-use state. A daylighting finder structure for a camera, which is composed of a flexible reflecting member.