JPH0279692A - Shutter device for electronic still camera - Google Patents

Abstract

PURPOSE:To obtain luminance information and color information with concur rence with simple structure and to obtain a sharp image with high picture quality by exposing two image pickup elements simultaneously by a single focal plane shutter. CONSTITUTION:Photographing light L is divided into parallel rays L1 and L2 by a prism 9, and the rays L1 and L2 are exposed simultaneously by a single large focal plane shutter, and are image-picked at first and second image pickup elements 3 and 6, respectively, and are separated to the one for luminance signal and for chrominance signal, respectively, then, are taken out as electrical signals. In such a way, since exposure on the first and second image pickup elements 3 and 6 can surely be performed, the luminance information and the color information with the concurrence can be obtained, and the image with sharpness and the high picture quality can surely be obtained. Furthermore, the number of components can be reduced, and the structure is simplified, there by, manufacturing cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shutter device for a high-quality electronic still camera that incorporates two imaging elements, one for luminance signals and one for color signals.

[Conventional technology]

Conventionally, electronic still cameras have had one built-in image sensor and have taken out a luminance signal and a color signal from the single image sensor, but they were inevitably inferior in terms of resolution. For this reason, we now have two built-in image sensors, and each image sensor takes the luminance signal from one and the color signal from the other, compared to the conventional one. It is now possible to obtain images of higher resolution and higher quality than those of the conventional type. One image section of such an electronic still camera will be explained based on FIG. 3. Photographing light that has passed through a mirror box 1 is divided within a prism 2, and one light L1 is sent to a first image sensor 3 for use as a luminance signal. The second image sensor 3 receives the light and takes an image.
A first shutter 4 is arranged in front of the camera to control exposure. And the other divided light Lt
Similarly, as a color signal, the light is received by a second image sensor 6 having a second shutter 5 disposed in front thereof. FIG. 4 shows a block diagram of a control system for controlling the operation of the imaging section shown in FIG. −
The photographing light received by the second image pickup device 3.6 is input to the recording system video circuit 8 as a luminance signal and a color signal to obtain an image of the subject. In order to obtain clear, high-quality images, the second and second image sensors must be
Simultaneity is required for the brightness information and color information of the subject obtained respectively in the 4.5 and 5.
must be operated in precise synchronization.

[Problem to be solved by the invention]

However, precisely synchronized operation of each shutter is difficult due to many factors such as mechanical variations in the individual shutters, variations in the load during operation, and differences in the mounting posture of each shutter.As a result, the image quality of captured images is It was lowering it.

This invention is like this! ! f! In view of the above problems, an object of the present invention is to provide a shutter device for an electronic still camera that has a simple structure, can obtain simultaneous luminance information and color information, and can obtain clear, high-quality images.

[Means and effects for solving the problem] The shutter device of the electronic still camera according to the present invention exposes both image sensors simultaneously by a single focal plane shutter placed in front of the first image sensor and the second image sensor. It has been made possible.

Therefore, by operating a single focal plane shutter during photographing, the first and second image pickup elements can be exposed simultaneously, and a clear image with high resolution can be obtained.

〔Example〕

An embodiment of the present invention will be described below based on the optical system of the imaging section shown in FIG.

In the figure, the first and second image pickup devices 3 and 6 are arranged in parallel (see FIG. 2), and 9 is a prism arranged in front of each image pickup device 3. The shadow light is divided by the half mirror surface 9a, one light is transmitted through the reflective mirror surface 9b, and the other light L2 is transmitted through the reflective mirror surface 9c,
9d, the light beams become parallel to each other, and can be incident on each image sensor 3.6 as a luminance signal and a color signal, respectively. 10 is a large focal plane shutter disposed between the prism 9 and each image sensor 3, 6 to expose each image sensor 3.6; 11.12 is a large focal plane shutter arranged in parallel as shown in FIG. leading blades arranged horizontally so as to simultaneously shield both trench image elements 3.6;
When both shoulders [11, 12 of the rear blade move in the vertical direction, the gap W between them allows both image pickup elements 3.6 to be exposed simultaneously.

The present embodiment is constructed as described above, and the prism 9 transforms the shadow light from the subject into parallel light L during photographing.
The light is divided into + and Lx.

, Li is a single large focal plane shutter 10
They are simultaneously exposed to light, imaged by the first and second image pickup elements 3.6, and separated into electrical signals for luminance signals and color signals, respectively.

As described above, according to this embodiment, since the first and second image sensors 3 and 6 can be exposed simultaneously, simultaneous brightness information and color information can be obtained, and clear, high-quality images can be ensured. Moreover, the number of parts can be reduced, the structure can be simplified, and manufacturing costs can be reduced.

In this embodiment, the luminance signal and the color signal are separated, but it goes without saying that the signal is not limited to this.

A color filter may be disposed in front of each element to separate and extract the G signal and RB flaw signal, for example.

〔Effect of the invention〕

As mentioned above, according to the shutter device of the electronic still camera according to the present invention, two image sensors are exposed simultaneously by a single focal brain shunter, so compared to the case where two shutters are controlled synchronously. By doing so, it is possible to reliably expose two image sensors at the same time to ensure that clear, high-quality images are obtained, and the number of parts is reduced, simplifying the structure and reducing manufacturing costs. be able to.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing the optical system of the image section of an embodiment of the electronic still camera according to the present invention, and FIG.
Schematic front view showing the four-force plane shutter of the figure,
FIG. 3 is a schematic side view showing the optical system of the imaging section of the conventional device;
FIG. 4 is a block diagram showing a control system of the imaging section shown in FIG. 3.゛ 3...First imaging element, 6...Second imaging element, IO...Focal plane shutter. U 1?2 figure

Claims (1)

[Claims] In an electronic still camera equipped with a first image sensor and a second image sensor for capturing divided photographic light, both the image sensors are simultaneously captured by a single focal plane shutter placed in front of both the image sensors. A shutter device characterized by being capable of exposure.