JPH06178169A - Exchageable finder device for electronic still camera - Google Patents

Abstract

PURPOSE:To miniaturize the back cover of a single lens reflex camera of exchangeable finder system and a back cover for electronic still camera to use an exchanged finder device as an electronic still camera by exchanging to the one for electronic still camera. CONSTITUTION:A lighting window 35 for white balance made of a translucent material in milk white color is provided at the front of the cover 31 of an exchangeable finder device 30 for electronic still camera, and a sensor 36 for white balance is provided at the inside rear of the window. Thereby, the device for white balance can be eliminated from the back cover for electronic still camera.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interchangeable viewfinder device for an electronic still camera for exchanging a part of an interchangeable viewfinder type single-lens reflex camera for a silver salt film to form an electronic still camera.

[0002]

2. Description of the Related Art In recent years, various so-called electronic still cameras have been proposed which record a still image on a magnetic disk, a memory card or the like, instead of a silver salt film. This type of camera is generally provided with a solid-state image sensor for converting an optical image into an electric signal at a position corresponding to a conventional film surface.
Further, there is known a system in which a back cover of a conventional silver salt camera is removed, and a back cover for an electronic still camera having a solid-state image pickup device is attached instead, and the silver salt camera is used as an electronic still camera. The advantage of this system is that you can turn your silver salt camera into a silver salt camera or electronic still camera simply by replacing the back cover, and if you own one camera body, you can use two types of cameras. It is a point that you can experience. Conventionally, the main purpose of this system is to transform an existing silver-salt camera into an electronic still camera, and the functions required for the electronic still camera, such as white balance, are not provided mainly in the camera. It is provided on the case back.

[0003]

However, in the above-mentioned conventional example, the white balance sensor is provided on the back cover (hereinafter referred to as SV back) for the electronic still camera.
Since the camera body can not be installed in the escaped position,
Originally, the light flux incident on the white balance sensor should be as close to the shooting light flux as possible,
Only relatively distant ones can be obtained. Therefore, the accuracy of the white balance was also poor. In addition, if it is attempted to dispose it near the photographing light flux, the SV bag itself has a drawback of being upsized.

The present invention eliminates the above-mentioned drawbacks of the prior art, and
It is an object of the present invention to provide an interchangeable viewfinder device for an electronic still camera that can downsize a V-back.

[0005]

In order to achieve the above-mentioned object, the present invention is an electronic still in which a back cover of an interchangeable viewfinder type single-lens reflex camera and an interchangeable viewfinder are removed and respective members for an electronic still camera are attached. In a camera, a white balance sensor is provided in an exchange finder for an electronic still camera.

[0006]

The exchange finder device for an electronic still camera having the above-described structure makes it possible to obtain a highly accurate white balance and also reduce the size of the SV back.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic sectional view of an interchangeable finder for an electronic still camera and an SV back of this embodiment, FIG. 2 is a perspective view of the interchangeable finder for an electronic still camera, and FIG. 3 is a similar interchangeable finder and an SV back. FIG. 4 is a perspective view when the camera is attached, and FIG. 4 is a perspective view when the replacement finder is removed. In the figure, reference numeral 1 is a camera body, which has a reflection mirror 2 inside, and a rail 4 on the rear surface (back side).
The finder optical system 20 has an aperture 3 provided with a, 4b and 4c, 4d, and on the upper surface thereof, there are exchange finder device mounting rails 5 and 6 and an optical member on the exchange finder device side between the rails 5 and 6. In addition to the focusing plate 21 and the condenser lens 22 constituting the above, a winding lever 7, a mode dial 8 and a rewinding dial 9 are provided. When the back cover for the film is attached, a film passage is formed by the rails 4a to 4d and a pressure plate (not shown) as is well known.

Reference numeral 10 denotes a taking lens mounted on the front surface of the camera body 1, 30 is an interchangeable viewfinder device for an electronic still camera, and a cover 31 thereof has a focus plate 21 and a focus plate 21 of the camera body 1 as described above. It has a condenser lens 22 and a pentaprism 23 and an eyepiece lens 24 which constitute the finder optical system 20, and an eyepiece hood 32 is attached to the rear surface thereof, and is attached to and detached from the rails 5 and 6 of the camera body 1 on the bottom surface side. Rails 33, 34, and the front surface (the surface facing the subject side) is provided with a daylighting window 35 for white balance. The daylighting window 35 is a translucent white milky material as is well known. And a white balance sensor 36 is provided behind it.
Reference numeral 40 is an SV bag attached to a portion corresponding to the film surface of the camera body 1, and a solid-state image sensor 41 is provided on the inner surface side thereof.
Further, an image pickup signal processing board 42 is provided, and when mounted on the camera body 1, the optical image formed by the taking lens 10 is converted into an electric signal by the solid-state image pickup device 41 and recorded on a magnetic disk, a memory card or the like (not shown). It

In this embodiment having the above-mentioned structure, when the interchangeable viewfinder device for an electronic still camera and the SV back are attached to the single-lens reflex camera body 1 to form an electronic still camera, the light flux from the subject enters the taking lens 10. ,
The incident light flux is normally guided to the finder optical system 20 by the reflection mirror 2, and the reflection mirror 2 is flipped up when the shutter is operated, so that the light flux from the taking lens 10 is optically transmitted to the solid-state image pickup element 41 of the SV back 40 corresponding to the film surface. An image is formed. Further, during the finder observation, the light A that has passed through the lighting window 35 is guided to the white balance sensor 36, and the output of the sensor 36 corrects the color temperature by a white balance circuit (not shown). In general, interchangeable viewfinder single-lens reflex cameras are limited to high-end machines for enthusiasts and professionals. For example, a viewfinder that is easy to see when shooting a fast-moving subject (sports) or a camera top A waist level finder, etc., that allows more confirmation can be provided and can be replaced freely according to the photographer's choice.

[0010]

As described above, the present invention attaches the electronic still camera back cover and the electronic still camera interchangeable finder to the interchangeable viewfinder type single-lens reflex camera to provide an electronic still camera with a white balance. By providing the sensor, the back cover for the electronic still camera can be downsized and a highly accurate white balance can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an interchangeable viewfinder for an electronic still camera and an SV back mounted single-lens reflex camera according to an embodiment of the present invention.

FIG. 2 is a perspective view of the exchange finder for the electronic still camera.

FIG. 3 is a perspective view of the exchange finder and the SV back when the camera is attached.

FIG. 4 is a perspective view when the replacement finder is removed.

[Explanation of symbols]

1 ... Camera body, 2 ... Reflection mirror, 3 Aperture, 4a, 4b, 4c, 4d ... Rail, 5, 6 ...
Rails for mounting interchangeable viewfinder, 10 ... shooting lens, 20 ... finder optical system, 30 ... exchangeable viewfinder device, 31 ... cover, 32 ... hood, 33,
34 ・ ・ Mounting rail, 35 ・ ・ White balance lighting window, 36 ・ ・ White balance sensor, 40 ・ ・
Back cover (SV back) for electronic still camera, 41 ... Solid-state image sensor, 42 ... Image signal processing board.

Claims (1)

[Claims] 1. An electronic still camera in which a back cover of an interchangeable viewfinder single-lens reflex camera and the interchangeable viewfinder are removed and respective members for the electronic still camera are attached, and a white balance sensor is provided in the interchangeable viewfinder for the electronic still camera. An interchangeable viewfinder device for electronic still cameras, characterized in that