JPS6087575A - Video camera - Google Patents

Abstract

PURPOSE:To enable a sharp video image to be observed at all times by detecting the illuminance near an electronic view finder so as to control the contrast of the electronic view finder. CONSTITUTION:An optical image from an image pickup lens 11 picking up an object is converted into an electric signal at an image pickup tube 12 and the picked-up image is confirmed at an electronic view finder 13 by using the electric signal. In approaching an eye onto an eye cap 14, an illuminance detecting signal of a CdS16 gets weak and a control circuit 17 decreases the contrast of the electronic view finder 13 to an easy to see contrast. In keeping the eye away from the eye cap 14, an external light touches the CdS16, the illuminance detection signal becomes strong and the contrast is increased by the control circuit 17 until the video image of the electronic view finder 13 is given sharply to the eye. Moreover, the contrast is adjusted to an optional contrast by an automatic/manual changeover means 18.

Description

[Detailed description of the invention] Industrial applications TECHNICAL FIELD The present invention relates to a video camera.

Conventional Structure and Problems In recent years, there has been a demand for an electronic visual finder that allows clear images to be viewed in a video camera.

A conventional video camera will be described below with reference to the drawings.

FIG. 1 is a block diagram of a conventional video camera.

A photographing lens 2 for photographing a subject is attached to the front of the video camera body 1, and an image pickup tube 3 converts an optical image from the photographing lens 2 into an electrical signal, and an electric signal from the image pickup tube 3 is used to capture the photographed image. Electronic viewfinder to check 4
is built into the video camera body 1. It is possible to enlarge and view the image of the electronic viewfinder 4 through a magnifying lens 6 provided on the eye cap 5.

However, with the above configuration, if you move your eyes away from the eye cap when shooting outdoors in strong sunlight,
There was a problem in that the contrast of the electronic viewfinder appeared to be reduced due to external light, and the image on the electronic viewfinder became unclear, making it extremely difficult to see.

OBJECTS OF THE INVENTION An object of the present invention is to provide a video camera that allows a movie image on an electronic viewfinder to be viewed clearly at all times.

Structure of the Invention The video camera of the present invention includes a photographic lens for photographing a subject, a photoelectric conversion means for converting an optical image from the photographic lens into an electrical signal, and an electronic converter for confirming an image using the electric signal converted by the photoelectric conversion means. It is equipped with a viewfinder, an illuminance detection means for detecting the illuminance in the vicinity of the electronic viewfinder, and a control circuit that controls the contrast of the image of the electronic viewfinder using the illuminance detection means. Being able to always see images clearly is what makes iEJ's ability□.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a configuration diagram of a video camera according to an embodiment of the present invention. A video camera body 10 is provided with a photographing lens 11 for photographing a subject, an image pickup tube 12 for converting an optical image from the photographing lens 11 into an electrical signal, and an image pickup tube 12
An electronic viewfinder 13 using a small cathode ray tube is built into the main body of the video camera, and the electronic viewfinder 13 uses a small cathode ray tube to confirm the photographed image using electrical signals from the video camera. In addition, a magnifying lens 15 is provided on the eye cap 14, which has a black matte coating on the inside, and a Cd516 is installed inside the eye camp 14 to detect the illuminance of external light inside the eye cap 14 outside the optical path of the electronic viewfinder. has been established. A control circuit 17 for adjusting the contrast of the electronic viewfinder 13 based on a signal from the Cd 516 is provided inside the video camera body 1o.

Furthermore, the automatic/manual switching means 18 allows the adjustment of the contrast of the electronic viewfinder 13 to be switched between automatic and manual.

The operation of the video camera of this embodiment configured as described above will be explained below.

An optical image from a photographing lens 11 for photographing a subject is converted into an electric signal by an image pickup tube 12, and the photographed image is confirmed by an electronic viewfinder 13 using the electric signal. When you bring your eyes close to the eye cap 14.

The illuminance detection signal of the Cd 516 becomes weaker, and the control circuit 17 lowers the contrast of the electronic viewfinder 13 to a contrast that is easy to see.

Also, if you move your eyes away from the eye cap 14, Cd51
6 is exposed to external light, the illuminance detection signal becomes strong, and the control circuit 1
Step 7 increases the contrast until the image from the electronic viewfinder 13 appears clear in step 1. The automatic/manual switching means 18 normally automatically adjusts the contrast to the most convenient contrast, and by switching to manual, the contrast can be adjusted to any desired contrast.

As described above, according to this embodiment, the CdS is provided inside the eye cap to detect the illuminance near the electronic pico-viewfinder, and the control circuit can control the contrast of the electronic viewfinder. Being able to always see the image in the electronic viewfinder clearly becomes an ability.

FIG. 3 is a configuration diagram of a video camera in another embodiment of the present invention. In this embodiment, a magnifying lens 15 inserted into an eye camp 14 and an electronic viewfinder 13 are used.
A light shielding plate 19 is provided between them, and Cd516 is provided on the eye cap side of the light shielding plate 19.

According to this embodiment, by providing a light shielding plate.

It is now possible to install CdS even in the optical path of the electronic viewfinder, eliminating malfunctions such as the CdS detecting the illuminance of the electronic viewfinder, and making it possible to accurately control the contrast of the electronic viewfinder image. becomes.

Although CdS was used as the illuminance detection means in each of the above embodiments, the illuminance detection means is not limited to CdS.
Any device may be used as long as it has the function of detecting illuminance. For example, a transistor can be used.

Effects of the Invention As is clear from the above explanation, the present invention is configured such that an illuminance detection means is provided near the electronic viewfinder and controls the contrast of the electronic viewfinder, so that it can be used outdoors or in other places with strong sunlight. When you move your eyes away from the eye cap when taking a picture, external light hits the electronic viewfinder, and the contrast of the electronic viewfinder appears to decrease, making the image in the electronic viewfinder unclear, but the illuminance detection means mentioned above By detecting the illuminance near the electronic viewfinder and controlling the contrast of the electronic viewfinder, you can achieve the excellent effect of always seeing clear images.

4. Description of the drawings Figure 1 is a configuration diagram of a conventional video camera, Figure 2 is a configuration diagram of a video camera according to an embodiment of the present invention, and Figure 3 is a viewfinder of a video camera according to another embodiment of the present invention. FIG. 2 is a partially enlarged configuration diagram.

13...Electronic viewfinder, 14...
...Eyecap, 16...CdS, 17
... Control circuit, 18 ... Automatic/manual switching means, 19 ... Light shielding plate 0

Claims (1)

[Claims] A photographic lens for photographing a subject, a photoelectric conversion means for converting an optical image from the photographic lens into an electrical signal, an electronic viewfinder for checking an image using the electric signal converted by the photoelectric conversion means, and the electronic viewfinder. 1. A video camera comprising an illuminance detection means for detecting illuminance in the vicinity of the camera, and a control means for controlling the contrast of an image of the electronic viewfinder using the illuminance detection means.