JP4274331B2 - Fish finder - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fish finder that emits ultrasonic waves of one frequency into the water, and displays the fish underwater, the lake bottom, etc. in two according to the depth.
[0002]
[Prior art]
In black bass fishing, which has been popular as a sport fishing in recent years, black bass often lives on the bottom of a hard lake, so it is important information to distinguish the hardness of the bottom of the lake. In fish finder and dual-frequency fish finder, emphasis is placed on the display of underwater information, that is, information from the surface of the water to the bottom of the lake.
[0003]
[Problems to be solved by the invention]
By the way, when the ultrasonic wave is emitted toward the lake bottom, since the reflection of the ultrasonic wave is small on the soft lake bottom, even if the sensitivity is improved so much, it is possible to display the second and third reflected waves of the ultrasonic wave. Although difficult, when the ultrasonic wave is emitted toward the hard lake bottom, the reflected wave of the ultrasonic wave is large, and therefore the second and third reflected waves can be displayed.
[0004]
However, even if there is a case where it is desired to know the state of the bottom of the lake in detail by displaying the second and third reflected waves of the ultrasonic wave with the conventional dual-frequency parallel fish finder, the second reflection and the third from the bottom of the lake. If the depth range is deepened to see the reflected waves, the image from the water surface to the bottom of the lake is compressed, making it difficult to see the state of the water and the image of the fish, and shifting the screen to center on the second and third reflected waves When displayed, the image of the underwater or fish protrudes from the screen, and therefore there is a drawback that the underwater state and the state of the lake bottom cannot be seen at the same time.
[0005]
[Means for Solving the Problems]
The present invention relates to one oscillation circuit that outputs an oscillation output, and one ultrasonic transducer that irradiates ultrasonic waves into the water and receives reflected echoes from the water using the oscillation output applied from the one oscillation circuit. A first depth setting circuit in which a depth range is set so as to pass a signal depending on a depth from a water surface to a lake bottom that is set in advance in the reflected echo from the water received by the one ultrasonic transducer; The depth range was set so that the second reflected echo signal and the third reflected echo signal from the lake bottom set in advance in the reflected echo signal from the water received by the one ultrasonic transducer were received . A second depth setting circuit; a first receiving circuit configured to receive a signal at a depth from the water surface to the lake bottom set by the first depth setting circuit; and the lake bottom set by the second depth setting circuit. From A second receiving circuit for receiving the second reflected echo signal and the third reflected echo signal, and a first A / D converter for converting the reflected echo signal amplified by the first receiving circuit into a digital echo signal A second A / D converter that converts the reflected echo signal amplified by the second receiving circuit into a digital echo signal, and a digital echo signal converted by the first A / D converter. 1 memory, a second memory for storing the digital echo signals converted by the second A / D converter, and a control for reading the digital echo signals stored in the first and second memories, respectively. By dividing the device and one screen into two, the digital echo signals read by the control device from the first and second memories are respectively displayed on two screens in respective depth ranges. It is made of a display device.
[0006]
[Action]
In the present invention, ultrasonic waves of one frequency are emitted into water, the reflected echoes are received by one ultrasonic transducer, and the reflected echo signals from the ultrasonic transducers are set by a depth setting circuit that can set the depth range. A depth range is set, the first and second receiving circuits receive and amplify each depth range, and the reflected echo signals amplified by the first and second receiving circuits are first and second A, respectively. A digital echo signal is converted by a / D converter and stored in the first and second memories, respectively, and the signals stored in the first and second memories are read out by the control device and displayed on one display device. By splitting the screen in parallel, one screen displays the range from the water surface to the bottom of the lake, and the other screen displays the second and third reflected waves of ultrasonic waves, thereby Habitat and ultrasound second and third The lake by the display of the reflected wave hard and soft states simultaneously can be displayed.
[0007]
【Example】
FIG. 1 is a block diagram of a fish detector according to an embodiment of the present invention. A transmitter circuit 1 is connected to an ultrasonic transducer 2 and connected to input terminals of first and second receiver circuits 3 and 4. The first and second receiving circuits 3 and 4 are connected to depth setting circuits 5 and 6 that can set the depth range, respectively, and the output terminals of the first and second receiving circuits 3 and 4 are connected to the first and second receiving circuits 3 and 4, respectively. The input terminals of the first and second A / D converters 7 and 8 are connected, and the output terminals of the first and second A / D converters 7 and 8 are connected to the first and second input terminals. The memories 9 and 10 are connected, the control device 11 is connected to the first and second memories 9 and 10, and the display device 12 is connected to the control device 11.
[0008]
In the fish finder according to the present embodiment configured as described above, when a signal of one frequency from the transmission circuit 1 is applied to the ultrasonic transducer 2, reflected echoes in the water and the bottom of the lake are reflected by the ultrasonic transducer 2. The reflected echo signal received from the ultrasonic transducer 2 is input to the first and second receiving circuits 3 and 4.
[0009]
Here, since the depth setting circuits 5 and 6 are connected to the first and second receiving circuits 3 and 4, respectively, a reflected echo signal from the water surface to the lake bottom is input to the first receiving circuit 3. The depth setting circuit 5 sets the depth range, and the second receiving circuit 4 sets the depth setting circuit 6 so that the second and third reflected echo signals from the lake bottom are received. The depth setting circuits 5 and 6 each have a built-in sensitivity setting circuit for individually setting the sensitivity.
[0010]
The reflected echo signals received and amplified by the first and second receiving circuits 3 and 4 in this way are converted into digital echo signals by the A / D converters 7 and 8, respectively. 2 is stored in the memories 9 and 10.
[0011]
The digital echo signals stored in the first and second memories 9 and 10 are sequentially read out by the control device 11 comprising a CPU, and the screen 13 of the display device 12 is divided into two screens as shown in FIG. 13a and 13b are divided and displayed. In this divided screen 13a, the state of the water from the water surface 14a to the lake bottom 14b is displayed as set by the depth setting circuit 5, and the divided screen is also displayed. In 13b, as set by the depth setting circuit 6, the lake bottom 15c by the second reflected wave and the lake bottom 15d by the third reflected wave are displayed outside the water surface 15a and the lake bottom 15b of the primary reflected wave. The place where the lake bottom 15c and the lake bottom 15d are displayed is a hard lake bottom, and the portion where only the second reflected wave is displayed without the third reflected wave and the portion where the second reflected wave is not displayed are the soft lake bottom. If there It can be made.
[0012]
As described above, in the present invention, the reflected echo signal received by the ultrasonic transducer 2 is transmitted from the transmission device 1 to one ultrasonic transducer 2, and the first and second receiving circuits 3, 4 are used. Since the screen 13 of one display device 12 is divided into the display screens 13a and 13b by setting and receiving the depth by the depth setting circuits 5 and 6, the normal image is displayed on the display screen 13a. The underwater information can be confirmed with the display, and by displaying up to the second and third reflected echo signals of the lake bottom on the display screen 13b, it is possible to always discriminate the hardness of the lake bottom.
[0013]
【The invention's effect】
As described above, in the fish finder of the present invention, by setting the depth of the reflected echo signal by one ultrasonic wave, the display screen of one display device is divided into two and displayed. Underwater information can be confirmed by displaying a normal image on the screen, and the second and third reflected echo signals are displayed on the other divided screen by displaying up to the second and third reflected echo signals of the lake bottom. Since the portion where is displayed is a hard lake bottom, there is an advantage that the hard and soft state of the lake bottom can always be determined.
[Brief description of the drawings]
FIG. 1 is a block diagram of a fish finder according to an embodiment of the present invention.
2 is a diagram showing a display screen of the display device of FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission circuit 2 Ultrasonic transducer 3 1st receiving circuit 4 2nd receiving circuit 5 1st depth setting circuit 6 2nd depth setting circuit 7 1st A / D converter 8 2nd A / D Converter 9 First memory 10 Second memory 11 Control device 12 Display device

Claims (1)

One oscillation circuit that outputs an oscillation output, one ultrasonic transducer that irradiates ultrasonic waves into the water and receives reflected echoes from the water using the oscillation output applied from the one oscillation circuit, and the one A first depth setting circuit in which a depth range is set so as to pass a signal based on a predetermined depth from the water surface to the bottom of the lake in the reflected echo received from the water by the ultrasonic transducer; The second depth in which the depth range is set so that the second reflected echo signal and the third reflected echo signal from the lake bottom set in advance among the reflected echo signals from the water received by the acoustic wave vibrator are received. A setting circuit; a first receiving circuit for receiving a signal at a depth from the water surface to the lake bottom set by the first depth setting circuit; and a second from the lake bottom set by the second depth setting circuit. Reflection A second receiving circuit that receives the co-signal and the third reflected echo signal; a first A / D converter that converts the reflected echo signal amplified by the first receiving circuit into a digital echo signal; A second A / D converter that converts the reflected echo signal amplified by the second receiving circuit into a digital echo signal, and a first memory that stores the digital echo signal converted by the first A / D converter A second memory for storing the digital echo signal converted by the second A / D converter, and a control device for reading the digital echo signals stored in the first and second memories, respectively. A display device that displays the digital echo signals read by the control device from the first and second memories on the two screens in respective depth ranges by dividing one screen into two. Fish finder, characterized in that it consists of.

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