JPS6225885U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of an image display device according to this invention, FIG. 2 is a diagram showing an example of its display state, and FIG. 3 is a waveform diagram for explaining the operation of the marker signal generation portion of FIG. 2. 4 is a block diagram showing an example of a portion where a marker signal is written, FIG. 5 is a block diagram showing an example of the differentiation circuit 56, FIG. 6 is a diagram showing another example of marker display, and FIG. 8 is a block diagram showing another example of the marker display signal generation and its writing generation part, FIG. 9 is a block diagram showing another example of the marker, and FIG. FIG. 11 is a block diagram showing another example of marker signal insertion. FIG. 11 is a block diagram showing a circuit for obtaining a trigger signal in a shift operation. 11: Cathode ray tube, 12: Main oscillator, 13: Frequency divider, 16: Main memory, 22: Trigger terminal, 23:
Input signal terminal, 18: Color conversion circuit, 24, 3
6: Buffer memory, 55: Marker generation frequency divider, 56: Differential circuit, 57: Gate, 54: Marker.

Amendment: August 25, 1981: The name of the invention is amended as follows. Title of the invention Image display device for fish finder The scope of the claim for utility model registration is amended as follows.

[Claims for Utility Model Registration] A scanning cathode ray tube for display, and information for one screen of the display of the cathode ray tube for display is stored and repeatedly read out in synchronization with the scanning of the display screen.
and a main memory that supplies the readout output as a display signal to the display cathode ray tube, and a main memory that transfers the detection signal from the fish finder to the main memory and sends the detection signal to the display cathode ray tube. The display of the tube is displayed as one display line at one end of the display screen , and
A means for erasing the detection signal of the oldest display line by sequentially moving the old display lines one by one to the other end of the display surface , and a means for erasing the detection signal of the oldest display line, and a marker signal that is synchronized with the scanning of the display cathode ray tube and shifted from the scanning starting point. and a marker signal generator that generates a marker signal and supplies it as a display signal to the display cathode ray tube, and from a position shifted by a predetermined amount from the display line displaying the latest transferred detection signal to the old display line side. a deviation amount of the generation of the marker signal from the scanning starting point so that the depth marker, which is short with respect to the length of the display surface in the display line arrangement direction, is extended in a direction perpendicular to the display line and displayed on the display cathode ray tube; An image display device for a fish finder in which the length of a marker signal is selected .

Claims (1)

[Scope of utility model registration request] A display cathode ray tube, a main memory that stores information for one screen of the display and repeatedly reads it out and supplies it to the display cathode ray tube; A buffer memory for storing the amount of information, and the contents of the buffer memory are transferred to the memory as one display line of the display cathode ray tube, and the display is moved one line at a time in a direction perpendicular to the display line. An image display device comprising means for erasing one line of an old display, and means for supplying a marker signal to the cathode ray tube to display a marker in a line perpendicular to the display line of the display cathode ray tube.