JPS6280943A - Electrostatic deflection type cathode ray tube - Google Patents

Abstract

PURPOSE:To simplify the deflection circuit by making the width of the electrode of one pair of deflectron type horizontal deflection electrodes and the width of the electrode of one pair of deflectron type vertical deflection electrodes not equal so as to make some difference between time. CONSTITUTION:The electrode widths (a) and (b) are both those in rotation direction, and are formed so as to be (a=2b). The image pickup tube provided with such patterns of horizontal and vertical electrode has the electrode width in the rotation direction of the horizontal deflection electrode of 4/3 times of that, the electrode width in the axial direction of (3/2)<1/2> times of that, the electrode width in the rotation direction of the vertical deflection electrode of 2/3 times of that, and the electrode width in the axial direction of (1/2)<1/2> times of that of the conventional pickup tube in which the ratio of the electrode width (a) to (b) is 1 to 1 respectively. And because the deflection sensitivity is proportional to the electrode width in the axial direction of the each deflection electrode, the horizontal deflection sensitivity becomes (3/2)<1/2> times of that and the vertical deflection sensitivity becomes (1/2)<1/2> times of that of said conventional pickup tube respectively. Thereby the load applied to the circuit elements such as transistors in the horizontal deflection circuit can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrostatic deflection type device comprising a pair of deflectron type horizontal deflection electrodes and a pair of deflectron type vertical deflection electrodes attached to the inner peripheral surface of a glass bulb. It relates to an image pickup tube or other cathode ray tube.

2. Description of the Related Art Conventionally, a pair of deflectron-type horizontal deflection electrodes 1a, 2a and a pair of deflectron-type vertical deflection electrodes 1b, 2b, which are made of a conductive film with a pointed pattern as shown in FIG. An electrostatic deflection type image pickup tube attached to a camera is known from Japanese Patent Application Laid-Open No. 132924/1983. Note that FIG. 2 is a developed view, in which Z indicates the axial direction of the glass bulb, and θ indicates the rotation direction.

Problems to be Solved by the Invention Incidentally, since the ratio of the horizontal deflection sensitivity to the vertical deflection sensitivity of the image pickup tube configured as described above is 1:1, the photocathode with the aspect ratio of 4:3 in the normal telephotography system is , the ratio of horizontal and vertical deflection voltages must be set to 4:3. However, when the horizontal deflection voltage increases despite the relatively large capacitance of the deflection electrode, the design of the horizontal deflection circuit is subject to significant restrictions due to the withstand voltage, power, frequency characteristics, etc. of the transistors used. . In particular, when the aspect ratio is 6:3 as in a high-definition television system, the horizontal deflection frequency becomes even higher, so the above-mentioned restrictions become even greater.

Therefore, an object of the present invention is to provide an image pickup tube in which both the horizontal deflection voltage and the vertical deflection voltage can be set relatively low.

Means for Solving the Problems According to the present invention, the electrode widths of the pair of deflectron-type horizontal deflection electrodes and the electrode widths of the pair of deflectron-type vertical deflection electrodes are not made the same, but a difference is created between them.

Effect With this configuration, the ratio of horizontal deflection sensitivity to vertical deflection sensitivity is not 1:1, and by setting this to 4:3, for example, the horizontal and Since each vertical deflection voltage can be made equal and the horizontal deflection voltage can be scaled, the design of the horizontal deflection circuit becomes extremely easy. It also becomes possible to simplify the deflection circuit.

Embodiment In FIG. 1 showing an embodiment of the present invention, each electrode width of a pair of deflectron type horizontal deflection electrodes 3a and 4a is indicated by a, and the electrodes are arranged so as to mesh with the horizontal deflection electrodes 3a and 4a. Each electrode width of the pair of deflectron-type vertical deflection electrodes 3b and 4b is indicated by b. However, FIG. 1 is a developed view, and Z in the figure indicates the axial direction of the glass bulb, and θ indicates the rotation direction about the axial direction Z, as described above. Both electrode widths a and b are in the rotational direction, and in this example are set to a = 2b.

An image pickup tube equipped with such a pattern of horizontal and vertical electrodes has a horizontal deflection electrode that is smaller than the conventional image pickup tube shown in FIG. The width of the electrode in the rotational direction becomes 4/3 times the width of the electrode in the axial direction, and the width of the electrode in the axial direction becomes 2/3 times the width of the vertical deflection electrode, and the width of the electrode in the axial direction becomes 571 times. Since the deflection sensitivity is proportional to the axial electrode width of each deflection electrode, the horizontal deflection sensitivity is i times (approximately 1
．． 2 times), and the vertical deflection sensitivity becomes E-(approximately 0.7 times).

That is, if the ratio of the rotational direction electrode width a of the horizontal deflection electrodes 3a and 4b to the rotational direction electrode width of each of the vertical deflection electrodes 3a and 4b is set to n:1, the horizontal deflection is 5 m s+n (
−・−) times. Of course, it goes without saying that it can also be applied to systems with an aspect ratio of 3:4, etc.

Effects of the Invention As described above, according to the present invention, the ratio between the horizontal deflection sensitivity and the vertical deflection sensitivity can be set arbitrarily. can be reduced to 57 times the conventional one, and the load placed on circuit elements such as transistors of the horizontal deflection circuit can be reduced.

[Brief explanation of drawings]

FIG. 1 is a developed view of horizontal and vertical deflection electrodes of an image pickup tube embodying the present invention, and FIG. 2 is a developed view of horizontal and vertical deflection electrodes of a conventional image pickup tube. 3a, 4a...Horizontal deflection electrode, 3b, 4b.
...Vertical deflection electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A pair of deflectron-type horizontal deflection electrodes attached to the inner peripheral surface of the glass bulb and a pair of deflectron-type vertical deflection electrodes arranged to mesh with the horizontal deflection electrodes have different electrode widths. An electrostatic deflection type cathode ray tube.