JPH0193282A - Index system color picture reproducing device - Google Patents

Abstract

PURPOSE:To absorb the dispersion in white color chromaticity point with simple circuit constitution in an index tube caused due to the dispersion in the luminescence efficiency or the coated width fluctuation of a phosphor by supplying a signal being the result of adjusting the amplitude and phase of a chrominance subcarrier and a signal being the addition of the chrominance carrier signal to a chrominance signal processing circuit. CONSTITUTION:An amplitude phase adjusting circuit 10 outputs a signal being the result of adjusting the phase and amplitude of a chrominance subcarrier from a chrominance subcarrier generating circuit 7. An adder 11 outputs a synthesized chrominance carrier signal being the result of adding a signal from the circuit 10 to the chrominance carrier signal inputted from a chrominance carrier signal circuit 8. In reproducing, e.g., white color, since the output from the chrominance carrier signal 8 is zero, the chrominance subcarrier wave whose amplitude and phase from the amplitude phase adjusting circuit 10 are adjusted is outputted from an adder 11. The chrominance signal processing circuit 4 receives the signal from the index signal detector 3 and the chrominance subcarrier wave from the chrominance subcarrier wave generating circuit 7 and the chrominance subcarrier from the adder 11 and a signal with a prescribed hue in response to the output of the adder 11 is outputted regardless of the reception of the white color signal, a prescribed hue is reproduced on the index tube 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an index type color image reproduction device,
In particular, the present invention relates to an index type color image reproduction device for setting the white chromaticity point to an optimum state.

[Conventional technology]

In order to reproduce color images using a single electron beam, a color image reproducing device using the index method uses color phosphor stripes arranged perpendicularly to the scanning direction of the electron beam and An index tube with a phosphor surface structure is used, with index phosphors arranged in a certain relationship.

FIG. 2 is a block diagram showing an example of a conventional index type color image reproduction device. This will be explained with reference to FIG.

The index tube 1 outputs from the funnel section 2 an original index signal obtained by scanning an index phosphor stripe with a single electron beam. The index signal detector 3 outputs a signal obtained by photoelectrically converting the original index signal from the index tube 1.

The color signal processing circuit 4 outputs a signal obtained by performing color signal processing on the signal from the index signal detector 3, the color subcarrier from the color subcarrier generation circuit 7, and the carrier color signal from the carrier color signal circuit 8. do.

The second adder 5 outputs a composite signal obtained by adding the output from the color signal processing circuit 4 and the luminance signal from the luminance signal processing circuit 9. The amplifier 6 amplifies the composite signal from the second adder 5 and drives the index tube 1.

[Problem that the invention seeks to solve]

In the above-mentioned conventional index-type color image reproduction device, the actual index cannot be adjusted due to variations in the coating width of each primary color phosphor on the index tube's phosphorescent surface and variations in luminous efficiency between phosphor manufacturing lofts. Variations in tube white chromaticity points cannot be ignored.

For example, with a color temperature of 9300°K, ±2000°
There is a problem in that the defective rate of products increases due to the variation of .

SUMMARY OF THE INVENTION An object of the present invention is to provide an index color image reproducing device capable of correcting variations in white chromaticity point caused by variations in coating width and luminous efficiency of the phosphor in the index tube.

[Failure to solve the problem]

The index-type color image reproducing device of the present invention provides a color signal that includes a signal obtained by photoelectrically converting an optical index signal from an index tube, a color subcarrier from a color subcarrier generation circuit, and a carrier color signal from a carrier color signal circuit. a second adder that drives the index tube via an amplifier with a signal obtained by adding the signal from the color signal processing circuit and the luminance signal from the luminance signal processing circuit; An index type color image reproducing device comprising: an amplitude and phase adjustment circuit that outputs a signal with the amplitude and phase adjusted of the color subcarrier; and a signal that is the sum of the signal from the amplitude and phase adjustment circuit and the carrier color signal. and a first adder that supplies the color signal to the color signal processing circuit.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention. This will be explained with reference to FIG.

The amplitude and phase adjustment circuit 10 outputs a signal in which the phase and amplitude of the color subcarrier from the color subcarrier generation circuit 7 are adjusted.

The first adder 11 outputs a composite carrier color signal obtained by adding the signal from the amplitude phase adjustment circuit 10 to the carrier color signal input from the carrier color signal circuit 8 . For example, when reproducing white color, the carrier color signal 8 input to the first adder 11
Since the output from the adder 1 is zero, the color subcarrier whose amplitude and phase have been adjusted from the amplitude and phase adjustment circuit 10 is sent to the first adder 1.
Output from 1.

The color signal processing circuit 4 receives the signal from the index signal detector 3, the color subcarrier from the color subcarrier generation circuit 7, and the first
The color subcarrier from the first adder 11 is input, and even though a white signal is being received, a signal of a predetermined hue corresponding to the output of the first adder 11 is output. A predetermined hue is reproduced.

In this way, by simply adding a color subcarrier with adjusted phase and amplitude to the carrier signal, variations in the white chromaticity point caused by variations in the phosphor width and phosphor luminous efficiency of the index tube 1 can be corrected. can do.

In addition, as shown by the broken line 13 in FIG. 2 in the above-mentioned embodiment,
By controlling the amplitude of the output signal of the amplitude and phase adjustment circuit 10 with the signal from the luminance signal processing circuit 9, a predetermined white point control amount can be obtained no matter what brightness the white signal is received.

〔Effect of the invention〕

As explained above, the present invention can absorb variations in the white chromaticity point of the index tube caused by variations in the coating width of the phosphor, variations in luminous efficiency, etc. with a simple circuit configuration, and .

This has the effect that even when reproducing primary colors such as green and blue, the reproduction balance can be stably adjusted without causing hue unevenness.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of an example of a conventional index type color image reproduction device. 1... Index tube, 2... Funnel part, 3...
... index signal detector, 4 ... color signal processing circuit, 5 ... second adder, 6 ... amplifier, 7 ... color printing carrier wave generation circuit, 8 ... carrier signal circuit, 9...
Luminance signal processing circuit, 10...amplitude phase adjustment circuit, 11
...first adder. Agent Patent Attorney Uchihara Back 1 Figure

Claims (1)

[Claims] a color signal processing circuit that outputs a signal obtained by processing a color signal using a signal obtained by photoelectrically converting an optical index signal from an index tube, a color subcarrier from a color subcarrier generation circuit, and a carrier color signal from a carrier color signal circuit; In the index method color image reproducing device, the indexing method color image reproducing device includes a second adder that drives the index tube via an amplifier with a signal obtained by adding the signal from the color signal processing circuit and the luminance signal from the luminance signal processing circuit. an amplitude and phase adjustment circuit that outputs a signal with the amplitude and phase of a subcarrier adjusted; and a first adder that supplies a signal obtained by adding the signal from the amplitude and phase adjustment circuit and the carrier color signal to the color signal processing circuit. An index method color image reproducing device comprising: