JPH03270589A - Color monitor for extremely small view finder - Google Patents

Abstract

PURPOSE:To confirm a camera angle, a focus and a color tone or the like by using a color filter so as to separate an image of a small light source tube 1 displaying a line drawing picture in horizontal direction to a fluorescent screen including plural primary color components such as green, red and blue or the like into three colors and synthesizing the picture as a color picture. CONSTITUTION:A light source 1 is made up of an extremely small CRT or a fluorescent display tube having linear light source comprising a luminant has fluorescent screens 11B, 11G, 11R including blue, green and red primary color components and a means applying horizontal line scanning to each primary color component of the fluorescent screens 11B, 11G, 11R by means of an electron beam to attain the line drawing picture display. Color filters 8B, 8G, 8R separating a light including each primary color component and radiating from the above linear light source into each primary color component are arranged corresponding to the above fluorescent screens 11B, 11G, 11R, e.g. 3 arrays of horizontal arrangement to a face 12 of the light source tube 1. An eyepiece lens 8 is used to observe a picture formed synchronously with the vertical picture by the drive speed control of the rotary polygon prism 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color monitor for an ultra-compact viewfinder such as a color video camera.

[Prior Art] Conventionally, as an ultra-compact viewfinder using such an ultra-compact monitor, an ultra-compact black-and-white cathode ray tube (15 mm) with a screen diagonal diameter of about 15 mm has been used as an ultra-compact viewfinder for such an ultra-compact monitor.
) images are magnified through the lens (2), and monochromatic cathode ray tubes (IG), (IR), (I
The image of B) is divided into two dichroic mirrors (3a) and (
3b) is used to synthesize a color image, which is then viewed through a lens (2) as a practical image size.

In other words, in the ultra-compact viewfinder shown in the wIJA diagram, since the image created on the fluorescent screen of an ultra-compact monochrome cathode ray tube (hereinafter referred to as CRT) (1) is small, it is enlarged using a lens (2) and then viewed through an eyepiece ( 6), and was used primarily to confirm camera angle and focus adjustment.

The ultra-compact viewfinder shown in Figure 5 consists of three small CRTs equipped with fluorescent screens that emit light in the primary colors of green, red, and blue.
The images of IG), (IR), and (IB) are combined using two gicroic mirrors (3a) and (3b) to form a color image, which is magnified using lens (2) and sent to the eyepiece. (8) to confirm the image.

[Problem to be Solved by the Invention III Among the conventional ultra-compact viewfinders configured as described above, the one shown in Fig. 4 makes it possible to check the camera angle and focus; It was not possible to confirm the characteristics of the image.

In addition, although it is possible to confirm the characteristics of a color image such as camera angle, dregs and color tone in the case of the one shown in FIG. 5, it requires three CRTs, which increases the cost. The large size of the device created a practical problem as a handheld video device.

This invention was made to solve the above-mentioned problems, and although it has a simple structure and can be constructed compactly, it also provides focus, color tone, and other functions that are necessary for a viewfinder. To provide a color monitor for an ultra-compact viewfinder that allows checking angles and the like and prevents color deterioration due to interference with other colors.

[1! Means for Solving the Problem] A color monitor for an ultra-compact viewfinder according to the present invention includes a fluorescent screen containing a plurality of primary color components, a light source tube made of a light emitter having means for horizontally scanning a line with an electron beam, A color filter for separating primary color components is provided at a position corresponding to the phosphor screen on the front face of the light source tube, and a color image is obtained through a rotating prism for vertical deflection provided in front of the color filter. The plate thickness of the face part of the color filter is 1 of the line pitch between the adjacent color of the color filter.
It is characterized by having a thickness of 0 times or less.

[Operation] According to the present invention, a plurality of primary color components, such as red, green,
The image obtained by the phosphor screen containing each color component of blue is separated into each primary color component through a color filter, and the combined image is displayed by horizontal line scanning using an electron beam, which is installed in front of a light source tube. A color image is reproduced by mechanically deflecting the image vertically using a rotating prism, and by enlarging this using a lens, camera angle, focus, color tone, etc. can be confirmed.

Further, since only a single CRT is used here, the structure is simple and miniaturization can be achieved. Furthermore, by setting the thickness of the face of the light emitter to less than 10 times the line pitch between adjacent colors on the color filter, color mixing due to interference with other adjacent colors is prevented and colors with high fidelity are achieved. You can get the image.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of an ultra-compact viewfinder according to an embodiment of the present invention, in which (+1 is an ultra-compact viewfinder)
A light source tube consisting of an RT or fluorescent display tube that holds a cotton-like light source using a luminescent material, and as shown in Figure 2, a fluorescent screen (IIR) containing the primary color components of blue, green, and red (fllG)
, (IIR) and these fluorescent screens CIIB), (II
G) and (IIR) means for performing line scanning in the horizontal direction with an electron beam corresponding to each primary color component to display a line image.

(8B), (8Gl, (8R1 is a color filter that includes the above primary color components and separates the light emitted from the linear light source into blue, green, and red primary color components, as shown in Figure 2.
The face part (12) of the light source tube (1) has 1 corresponding to the L2 phosphor screen +118), fllG), and [11R).
For example, they are arranged in three horizontal rows.

(9) is a condensing lens, (4) is a rotating polygon prism, and these are amned in front of the light source tube +11, and - the horizontal scanning only light emitted from the linear light source of the light source tube (1), , which deflects the horizontal component of the image vertically.

(5) is a monitor which drives and rotates the rotating polygon prism (4) and controls its rotational speed.

(6) is the eyepiece, which is the rotating polygon prism 0)
The image is formed in synchronization with the vertical image by controlling the rotation speed of the image.

FIG. 3 shows the phosphor screens (IIB) and (IIG) in the ultra-compact viewfinder color monitor configured as described above.

A specific configuration example of (IIR) is shown, and for such a configuration example, the plate thickness (1) of the face portion (12) of the light source tube (1) is set to about 1 mm.

That is, the face portion (12) of the light source tube (1) as a linear light source serves as a vacuum container and as a fluorescent screen (IIB).
), (IIG), and (IIR). From the viewpoint of strength, it is desirable that the face portion (12) be thick to some extent.

However, the color filters (8B), (8G), (
8R) is an important factor.

That is, the closer the distance between the phosphor screen and the color filter is, the less interference with adjacent colors will occur, and a color image with high fidelity can be obtained.

These dimensions vary somewhat depending on the position of the eye relative to the image plane and the angle of view of the lens system, but the thickness of the face portion (12) is 1
It has been found that a thickness of about mm is good, and that when it exceeds 2 mm, color mixing due to interference with other colors becomes a problem.

In other words, depending on the stripe width of the color filter, the plate thickness (1) is less than 10 times the pitch between adjacent colors of the filter.
It has been found that it is desirable that the ratio is greater than 10 times, and that it becomes a level that causes problems in practice.

Note that the light source used for such purposes only needs to have a phosphor screen that can perform line scanning in the scanning direction, and does not require a fine mosaic phosphor screen structure like a normal color CRT. :3 is not required to be made into a screen, so
For example, a CR'T with a flat fluorescent screen or a fluorescent display tube with a simple structure can be used.

[Effects of the Invention] As described above, according to the present invention, an image produced by a phosphor screen containing a plurality of primary color components such as green, red, and blue and an ultra-compact light source tube that displays only horizontal line images is processed using a color filter. Since it is possible to efficiently separate the three colors and synthesize them as a color image, it is possible to check the camera angle, focus, color tone, etc.

In addition, the CRT used here has a single phosphor structure, so it has a simple structure, can be made compact, and has a great practical effect as a handheld video device. By setting the thickness of the body face portion to 10 times or less the line pitch of the color filter, interference with other colors can be prevented and a color image with high fidelity can be obtained.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of the ultra-compact viewfinder according to the present invention, Figure 2 is an enlarged view of the face of the light source tube, Figure s3 is an example of the configuration of a fluorescent screen, and Figure 4 is a black and white view using a conventional black and white CRT. Fig. 5 is a block diagram of a conventional color view finder. (1)...Light source tube, 0)...Rotating polygon prism. (8B), (8G), (8R)...color filter,
(HB), (txc). (IIR)...Fluorescent screen, (12)...Face part. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A phosphor screen containing a plurality of primary color components, a linear light source using a light emitting body having means for horizontally scanning a line with an electron beam corresponding to each of the primary color components of the phosphor screen, and a linear light image from this linear light image. A rotating prism for vertically deflecting the emitted light, and a color filter for separating into primary color components corresponding to the phosphor screen are provided on the face portion of the light source tube that holds the light emitter for the linear light source, A color monitor for an ultra-compact viewfinder, characterized in that the thickness of the face portion of the body is 10 times or less the line pitch between adjacent colors of the color filter.