JPH11211825A - Fish detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To emit ultrasonic waves with one frequency into water and to display fishes and the hard/soft states or a lake bottom in two areas respectively. SOLUTION: The reflected echo from underwater received by an ultrasonic vibrator 2 is received by first and second receiving circuits 3, 4 connected to depth setting circuits 5, 6 capable of setting a depth range, amplified reflected echo signals are converted into digital echo signals by first and second A/D converters 7, 8 respectively and stored in first and second memories 9, 10. The digital echo signals stored in the memories 9, 10 are read out by a control device 11, one screen of a display device is split into two, and the digital echo signals are displayed in respective depth ranges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fish finder which emits one-frequency ultrasonic waves into water to display underwater fish, lake bottom, etc. in two parts according to depth. It is.

[0002]

2. Description of the Related Art In recent years, in black bass fishing, which has become popular as sport fishing, since black bass often live on a hard lake bottom, it is important to determine the hardness of the lake bottom, etc. In the conventional single-frequency fish finder and dual-frequency parallel fish finder, the emphasis has been placed on displaying underwater information, that is, information from the water surface to the lake bottom.

[0003]

By the way, when ultrasonic waves are emitted toward the bottom of the lake, the reflection of the ultrasonic waves is small on the soft bottom of the lake.
And it is difficult to display the third reflected wave, but when the ultrasonic wave is emitted toward the hard lake bottom, the reflected wave of the ultrasonic wave is large, so that the second and third reflected waves can be displayed. .

[0004] However, even if it is desired to know the state of the lake bottom 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 from the lake bottom may be required. When the depth range is deepened to see up to the third reflected wave, the image from the water surface to the lake bottom is compressed, making it difficult to see the underwater condition and the image of the fish, and shifting the screen to reduce the second and third reflected waves. If the image is displayed in the center, the image of the underwater or the fish protrudes from the screen, so that there is a drawback that the state of the underwater and the state of the lake bottom cannot be seen at the same time.

[0005]

According to the present invention, an oscillation signal is applied from one transmission circuit to one ultrasonic vibrator, and ultrasonic waves are irradiated from the ultrasonic vibrator into water, and reflected from the water. In a fish finder that receives echoes and displays them on a display device, a first and a second depth setting circuits are respectively connected to a depth setting circuit that can set a depth range of reflected echoes from underwater received by the ultrasonic vibrator. The reflected echo signals received by the receiving circuit and amplified by the first and second receiving circuits are respectively converted into digital echo signals by first and second A / D converters, and the digital echo signals are respectively converted to digital echo signals. 1,
The digital echo signals stored in the second memory and read out by the control device from the first and second memories are respectively read, and one screen of the display device is divided into two and displayed in respective depth ranges. Is what you do.

[0006]

According to the present invention, an ultrasonic wave of one frequency is emitted into water, and its reflected echo is received by one ultrasonic transducer.
The reflected echo signal from the ultrasonic transducer is set in a depth range by a depth setting circuit capable of setting a depth range, and received and amplified by the first and second receiving circuits for each of the depth ranges. The reflected echo signal amplified by the second receiving circuit is converted into a digital echo signal by first and second A / D converters, and stored in the first and second memories, respectively.
The control device reads out the signals stored in the first and second memories, divides the display screen of one display device into parallel images, and displays the range from the water surface to the lake bottom on one screen, On the other screen, by displaying the second and third reflected waves of the ultrasonic wave, the inhabitation of the black bath in water and the hard and soft state of the lake bottom by displaying the second and third reflected waves of the ultrasonic wave are simultaneously displayed. Can be displayed.

[0007]

FIG. 1 is a block diagram of a fish finder according to one embodiment of the present invention. A transmitting circuit 1 is connected to an ultrasonic vibrator 2 and includes first and second receiving circuits 3 and 4. Depth setting circuits 5 and 6, which are connected to input terminals and can set a depth range, are connected to the first and second receiving circuits 3 and 4, respectively. The output terminal
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 memories, respectively. 9, 10 are connected, and
A control device 11 is connected to the first and second memories 9 and 10, and a display device 12 is connected to the control device 11.

In the fish finder of the present embodiment configured as described above, when a signal of one frequency from the transmission circuit 1 is applied to the ultrasonic vibrator 2, the reflected echoes in the water and at the bottom of the lake are subjected to ultrasonic vibration. The reflected echo signal received by the transducer 2 and from the ultrasonic transducer 2 is input to the first and second receiving circuits 3 and 4.

Here, since the first and second receiving circuits 3 and 4 are connected to the depth setting circuits 5 and 6, respectively, the first receiving circuit 3 has reflected echoes from the water surface to the lake bottom. The depth range is set by the depth setting circuit 5 so that a signal is input, and the second receiving circuit 4 further sets the depth setting circuit 6 so that the second and third reflected echo signals from the lake bottom are received. And each depth setting circuit 5,
6 has a built-in sensitivity setting circuit for individually setting the sensitivity.

The reflected echo signals received and amplified by the first and second receiving circuits 3 and 4 are A / A
The signals are converted into digital echo signals by D converters 7 and 8 and stored in first and second memories 9 and 10, respectively.

The digital echo signals stored in the first and second memories 9 and 10 are transmitted to a control unit 1 comprising a CPU.
2, the screen 13 of the display device 12 is divided into two screens 13a and 13b and displayed as shown in FIG. 2, and the divided screen 13a is set by the depth setting circuit 5. So that the lake bottom 1
The underwater condition up to 4b is displayed, and the divided screen 13b has a second reflected wave on the water surface 15a and the lake bottom 15b of the primary reflected wave as set by the depth setting circuit 6. The lake bottom 15c and the lake bottom 15d by the third reflected wave are displayed. Therefore, the place where the lake bottom 15c and the lake bottom 15d are displayed is a hard lake bottom, and the second reflected wave is not displayed.
The portion where only the reflected wave is displayed and the portion where the second reflected wave is not displayed can be regarded as a soft lake bottom.

As described above, according to the present invention, the reflected echo signals received by the ultrasonic vibrator 2 are transmitted from the transmitting device 1 to one ultrasonic vibrator 2 to the first and second receiving circuits. The screen 13 of one display device 12 is divided and displayed on the display screens 13a and 13b by setting and receiving depths by the depth setting circuits 5 and 6 of 3 and 4, so that the display screen 13a The underwater information can be confirmed with a normal image, and the hard and soft state of the lake bottom can always be determined by displaying the second and third reflected echo signals of the lake bottom on the display screen 13b.

[0013]

As described above, in the fish finder of the present invention, the display screen of one display device is divided into two and displayed by setting the depth of the reflected echo signal by one ultrasonic wave. However, in one of the divided screens, a normal image can be displayed to check underwater information, and in the other divided screen, the second and third reflected echo signals on the lake bottom are displayed, so that the second and third reflected echo signals are displayed. Since the portion where the third reflected echo signal is displayed is the hard lake bottom, there is an advantage that the hard / 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 one embodiment of the present invention.

FIG. 2 is a diagram showing a display screen of the display device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitting circuit 2 Ultrasonic transducer 3 First receiving circuit 4 Second receiving circuit 5 First depth setting circuit 6 Second depth setting circuit 7 First A / D converter 8 Second A / D Converter 9 First memory 10 Second memory 11 Control device 12 Display device

Continuing on the front page (72) Inventor Kenji Moriya 20 Oyamazuka, Oiwa-cho, Toyohashi-shi, Aichi Prefecture Inside Honda Electronics Co., Ltd. (72) Inventor Yoshikazu Muramatsu 20-Oyamazuka, Oiwa-cho, Toyohashi-shi, Aichi Honda Honda Electronics Inside the corporation

Claims (2)

[Claims] 1. An oscillation signal is applied from one transmission circuit to one ultrasonic transducer, an ultrasonic wave is irradiated from the ultrasonic transducer into water, and a reflected echo from underwater is received. In a fish finder configured to display, first and second depth setting circuits respectively connected to a depth range which can set a depth range of reflected echoes from underwater received by the ultrasonic transducer.
The first and second A / D converters convert the reflected echo signals received by the first and second receiving circuits into digital echo signals, and convert the digital echo signals into digital echo signals. The control unit reads out the digital echo signals stored in the first and second memories, respectively, and divides one screen of the display device into two. A fish finder characterized by displaying a range. 2. The fish finder according to claim 1, wherein said depth setting device has a built-in sensitivity setting device.