JPH062377Y2 - Electronic beam recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electron beam recording apparatus suitable for use in recording a television image on a photographic film by using an electron beam as a stylus.

[Outline of device]

This invention is an electron beam recording apparatus for recording a television image using a stylus with an electron beam on a photographic film to form interpolated signals between lines by reading the same line a plurality of times from a frame memory, and the number of times the same line is read. When n is set to n times, by controlling the beam current from the electron gun to 1 / n, the film utilization rate is improved, and the frequency characteristics, S / N, density range, etc. are improved. is there.

[Conventional technology]

Conventionally, an electron beam recording device (hereinafter abbreviated as EBR) for recording a television image on a photographic film using an electron beam as a stylus is known.

In such an electron beam recording apparatus, the electron beam emitted from the filament of the electron gun to the film is controlled by the video signal supplied to the grid provided near the filament. The beam diameter on the film can be adjusted by changing the gain of the video signal supplied to the grid.

[Problems to be solved by the invention]

By the way, the beam diameter on the film may be a small beam diameter as shown in FIG. 3 or a large beam diameter as shown in FIG. If the utilization rate of No. 2 is poor, the concentration range becomes small and the S / N deteriorates, resulting in deterioration of performance.
Further, in the case of a large beam diameter, there is a defect that the frequency characteristic of the video signal recorded on the film cannot be obtained and the resolution is deteriorated.

The present invention has been made in view of the above circumstances, and provides an electron beam recording apparatus capable of increasing the utilization rate of a film and improving the characteristics such as frequency characteristics, S / N, and density range. is there.

[Means for solving problems]

The electron beam recorder according to the present invention is a frame memory.
In the electron beam recording device in which the beam current output from the electron gun (3) is controlled by the video signal read out from (9) to scan on the film (2) surface, the same from the above frame memory The lines are read a plurality of times to form interpolated signals between the lines, and the beam current from the electron gun is controlled to 1 / n when the number of times of reading the same line is n times.

[Action]

Video signals of, for example, 1125 scanning lines from a video tape recorder or the like are written in the frame memory (9). When reading the written information from the frame memory, the same line is read a plurality of times, for example, twice. Therefore, the information of the previously read line exists between the previously read line and the next read line. That is, there is an interpolation signal. The beam current from the electron gun is controlled by the information (video signal) read for each line, and the beam current from the electron gun is reduced to 1 / n when the number of times of reading the same line is n times. Control. From this, the utilization rate of the film increases, the frequency characteristics,
Various characteristics such as S / N and concentration range are improved.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to FIGS. 1 and 2.

FIG. 1 shows a circuit configuration of this embodiment. In FIG. 1, (1) is an EBR, and a filament (3) of an electron gun is directed toward a film (2) loaded therein. The recording electron beam B is emitted, and the beam current amount of the electron beam B is controlled by the voltage of the grid (4). (5) is a power source for the filament (3), (6) is an exhaust port, and (7) is an amplifier.
Note that focusing, deflection, accelerating means, etc. for the electron beam B are well known, and therefore illustration and description thereof are omitted.

(8) is a video tape recorder (VTR), (9) is a frame memory for storing video signals of, for example, 1125 scanning lines from the video tape recorder, and (10) is a control circuit for controlling the frame. The video signal read from the frame memory (9) is supplied to the grid (4) via the amplifier (7).

Now, in this embodiment, the frame memory (9) normally writes the video signal from the video tape recorder (8) in frame units at the time of writing, but at the time of reading, the same line is written under the control of the control circuit (10). It is read a plurality of times, for example, twice.
FIG. 2 shows a state in which the same line is read twice from the frame memory (9). Following the reading of the first line, the reading of the first line reads the video signal at the same position as the first line and the interpolation signal. At the same time, the second line is read out at the same time as the second line is read out by reading the video signal at the same position as the second line and forming an interpolation signal. The video signals of 1125 × 2 scanning lines are substantially read out from the frame memory (9) sequentially.

The video signal thus read out is supplied to the amplifier (7), where the gain is changed to control the voltage applied to the grid (4), and as a result, the beam diameter from the filament (3) becomes It is adjusted to a small beam diameter as shown in FIG. Then, an electron beam having a beam diameter arranged substantially as shown in FIG. 2 is projected on the film (2). As a result, the electron beam is projected on the film (2) all over the area, so that the utilization efficiency of the film is increased, and as a result, the frequency characteristics of the video signal recorded on the film (2) are expanded and the S / N is also improved. However, the concentration range is also satisfactory.

The gain of the amplifier (7) is 1/2 when reading the same line twice as described above when reading the same line from the frame memory (9). Similarly, the same line is read three times and four times. In this case, use 1/3 or 1/4 of the one read. This reduces the beam current from the filament (3) to 1 / 2,1.
Change to / 3,1 / 4 to facilitate narrowing the beam diameter. Also,
The playback speed of the video tape recorder (8) is 2 for the same line.
When reading out twice, it is 1/6 of normal, and when reading the same line three times and 4 times, it is 1/9, 1/12 of normal, respectively.

In the above-mentioned embodiment, the same line is read a plurality of times to form the interpolation signal, but the information obtained by adding the information of the previously read line and the information of the next read line to 1/2 is the interpolation signal. You may use as.

[Effect of device]

As described above, according to the present invention, the same line is read a plurality of times from the frame memory to form an interpolated signal between lines, and the interpolated signal and the original signal (the signal from the first read line) are used to form an electron gun. Since the beam current from the film is controlled, the utilization factor of the film is increased, and various characteristics such as frequency characteristics, S / N and density range are improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the operation of the present invention, FIG. 3 and FIG.
The figure is a diagram for explaining the conventional beam diameter. (1) is electron beam recorder (EBR), (2) is film,
(3) is filament, (4) is grid, (7) is amplifier, (8)
Is a video tape recorder (VTR), (9) is a frame memory, and (10) is a control circuit.

Claims (1)

[Scope of utility model registration request] 1. An electron beam recording apparatus for scanning a film surface by controlling a beam current output from an electron gun according to a video signal read from a frame memory, wherein the same line is recorded from the frame memory. An interpolation signal between lines is formed by reading out a plurality of times, and the beam current from the electron gun is controlled to 1 / n when the number of times of reading out the same line is n times. Electron beam recorder.