JPS6269117A - Direction display device - Google Patents

Abstract

PURPOSE:To easily grasp whether the current progressing direction coincides with the direction to the target spot or to what extent the current progressing direction is deviated from the direction to the target spot by outputting a direction setting signal making it possible to preset the progressing direction to the target spot and corresponding to the set direction. CONSTITUTION:The titled device is provided with a direction setting circuit 2, a direction detection circuit 14, a directional difference calculation circuit 28 and a directional difference display circuit 44. Then, the circuit 2 consists of an external operation member 4 outputting an operation signal, a chattering preventive circuit 6 and a counter 8. Further, the circuit 14 consists of a terrestrial magnetism sensor 16 detecting the progressing direction and an amplifier 18 amplifying a detected signal outputted from the sensor 16 and the like and further, the circuit 28 consists of a ring counter 30 and a comparison circuit 42 and the like and further, the circuit 44 consists of a driver 46 and a display 48 and the like. Then, the circuit 2 sets the progressing direction to the target spot. Further, the detector 14 detects the progressing direction. The difference between the set direction and the progressing direction is calculated every prescribed time and the calculated directional difference is displayed on the circuit 44.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a direction display device that displays the direction of travel of a vehicle, etc., and in particular, the direction of travel to a set destination and the actual direction of travel. Regarding what can show the difference.

(b) Prior art As a conventional direction display device of this type, Japanese Patent Application Laid-Open No. 55-1
There was one disclosed in Publication No. 47608.
This direction display device electronically detects the current direction of a vehicle, etc., and displays the current direction by lighting up a plurality of annularly and radially arranged display elements as appropriate.

(c) Problems to be Solved by the Invention The above-mentioned prior art can display the actual heading, but if the heading to the destination is not constantly recognized, the displayed current heading will be the destination. It was not possible to determine whether or not the direction corresponded to that of the previous one.

In addition, if the current heading does not match the heading of the target location, it is not possible to display the direction in which it deviates by how much, and the user must judge for themselves in relation to the heading of the target location. There wasn't.

If the direction of the destination is not always recognized in this way, the direction of travel will be lost, but constantly knowing the direction of the destination is extremely troublesome for people who drive vehicles etc. .

(d) Means for solving the problem The present invention provides a bearing setting circuit for setting a heading to a destination, a bearing detecting circuit for detecting the heading, and a difference between the set heading and the heading. The present invention is characterized by comprising an azimuth difference calculation circuit that calculates the azimuth difference at regular intervals, and an azimuth difference display circuit that displays the calculated azimuth difference, thereby solving the problems of the prior art.

(e) Examples An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing a circuit configuration of a direction display device according to an embodiment of the present invention.

Reference numeral 2 denotes a direction setting circuit, which is composed of an external operation member 4 that outputs an operation signal, a chattering prevention circuit 6, and a counter 8 that inputs the operation signal to the clock counter via the chattering prevention circuit 6. .

The counter 8 in this embodiment is set to output a code signal A including codes from rOJ to "7".

As shown in Table 1, the codes "0" to "7" each correspond to the eight divided directions.

Table ■ 10 is a decoder driver that inputs signal A, 12 is a display device driven by the decoder driver 10,
Displays the direction of the set destination.

14 is an azimuth detection circuit, which includes a geomagnetic sensor 16 that detects the heading direction, an amplifier 1B that amplifies the detection signal output by the geomagnetic sensor 16, and a circuit that artificially indicates eight azimuths using the amplified signal. It is comprised of a coding circuit 20 that converts code signals from "0" to "7" and a latch circuit 22 that latches the coded signals at regular intervals.

24 is an oscillator, and 26 is a frequency divider that appropriately divides the frequency of the output signal of the oscillator 24.

28 is an azimuth difference calculating circuit, which includes a ring counter 30 which inputs the clock signal OI from the frequency divider 26 and sequentially outputs signals 01 to C5, and a ring counter 30 which inputs the clock signal 01 to the - input terminal and outputs the signals 01 to C5 sequentially; AND gates 32 to 40 each input signals C1 to C5, and code signal A output from counter 8 in azimuth setting circuit 2 and code signal BI from latch circuit 22 in azimuth detection circuit 14 are input to AND gates. The comparison circuit 42 receives the output signals D2 to D5 of the filters 4 to 40 as timing signals.

44 is an azimuth difference display circuit, which includes a driver 46 which inputs the signal E l -E 5 outputted by the comparison circuit 42 in the azimuth difference calculation circuit 28, and an output signal of this driver 46;
AND gate 50 which inputs the signal E6 output from the corpse comparison circuit 42 and the clock signal Da2 and applies the signal F6 to the driver 46. It is composed of.

Next, a more detailed circuit configuration of the comparison circuit 42 will be explained using FIG.

52.54 is an up counter, 56.58 is a down counter, and the up counter 52 and the down counter 56
inputs the signal D4 to the clock input X, and the up counter 54 and the down counter 58 input the signals D3 and D4 to the clock input DA via the OR gate 60.

Further, the up counter 52.54 and the down counter 56.58 input a code signal Bl indicating the current heading from the azimuth detection circuit 14, and are preset to the numerical value indicated by the code signal at the timing of the signal D2. It is something.

62 to 70 are coincidence detection circuits, and the up counter 52
．． The code signals B2 to B5 output by the down counters 54 and 56 and 58 and the code signal A indicating the set direction from the direction setting circuit 2 are respectively input, and are compared at the timing of the signal D5. If they match, the signal E l is inputted. -E 5 is set to H level.

72 is an NG detection circuit consisting of a Nant gate, and the output signals El to E5 of the coincidence detection circuits 62 to 70 are all L.
It detects the level and outputs the NG signal E6.

FIG. 3 is a diagram showing a more detailed configuration of the display 12.48 shown in FIG. 1.

The display 12 consists of two display sections 74 and 76.

The display 74 consists of a segment arranged in the shape of a sun character and two segments provided diagonally from the upper left corner to the lower right corner. It consists of two V-shaped segments provided within the side mouth-shaped portion.

According to the display 12, not only "east (E)" and "south (S)" but also "north (N)", "west (W)", [southeast (SE) J]
, [Northwest (NW) J, etc. can also be displayed.

The display 48 has a semicircular shape, and is further divided into five areas, in which segments 78 to 86 are arranged.

Segment 78 lights up when there is no difference between the set heading and the current heading, and segments 80.82 light up when the difference is +1.
The segment 84.8 lights up when the direction is
6 lights up when the difference is +2 directions.

Note that if a difference of ±2 directions or more occurs, all segments 78 to 86 blink.

Next, the operation of the circuit shown in FIGS. 1 and 2 will be explained based on the time charts shown in FIGS. 4 and 5 and the diagrams showing the lighting states of the indicators 12.48 shown in FIGS. 6 to 9. Explain.

In the initial state, the code signal A output from the counter 8 of the direction setting circuit 2 indicates rOJ, and as shown in Table 1,
This indicates "north".

In this state, the external operating member 4 in the direction setting circuit 2
is operated to advance the count of the counter 8, and the output signal A is set to be the code "3" indicating "southeast".The decoder/driver 10 converts the code signal A of the bar into a drive signal, and As shown in the figure, the display 12
'-8E (Southeast)' is displayed.

Thereafter, the vehicle or the like begins to move, and its traveling direction is detected by the geomagnetic sensor 16 in the direction detection circuit 14, and a code signal of the traveling direction is successively applied to the latch circuit 22 via the amplifier 18 and the encoding circuit 20. .

This latch circuit 22 latches the heading code signal applied from the encoding circuit 2G as a code signal B+ every time a pulse is generated at a constant interval in the input signal D1.

This code signal Bl is applied to the up counter 52.54 and down counter 56.58 of the comparator circuit 42 shown in FIG. Preset.

Therefore, as shown in FIG. 4, when the current heading is "southwest", the code "5" is preset in the up counter 52.54 and the down counter 56.58. When a pulse is generated in the signal D3, the up counter 54 and the down counter 58 amplify or down their counts to make their respective count values "6" and "4".

Following this, a pulse is also generated in signal D4, and this pulse causes up counter 52,54 and down counter 5
6.58 increases or decreases the count, making the respective counts f 16'', ``7'', ``4'', and ``3''.

That is, the down counter 56 and up counter 52 output code signals in ±1 direction of the current heading, and the down counter 58 and up counter 54 output code signals in ±2 directions of the current heading. Become.

The signal B1 from the direction detection circuit 14 and the signals B2 to B5 from these counters 52 to 58 are supplied to coincidence detection circuits 62 to 70, respectively, and when a pulse occurs in the signal D5, it matches the code signal A indicating the set direction. Detect whether there is something to do.

In this example, the signal 13s is "6", which is the same as the signal A, and the minus number output circuit 70 detects this and latches its output signal E5 at H level.

When the signal E5 goes high in this way, the output signal F5 of the driver 46 in the azimuth difference display circuit 44 goes high, and the segment 84 of the display 48 to which this is applied lights up, as shown in FIG. , displays that the current heading is shifted by +2 azimuths from the set azimuth and is heading toward the "southwest."

Note that the above operation is performed using signals D1 to D5 in which pulses are sequentially generated.
This is done in sequence according to the following.

Furthermore, in order to prevent the display from flickering, the ring counter 60 in this embodiment is set to count several stages after outputting the signal C1-(:a, and then return to the first stage. Pulses are generated in the repetitive signals C1 to C5.

Next, as shown in FIG. 4, the count of ring counter 0 returns to the first stage and pulses are generated again in order from signal C1, and as a result, a pulse is generated in signal D1.
The latch circuit 22 latches a code signal indicating the current heading.

If the heading direction at this time is "southeast", the code signal B1
is latched to the code ``ro'' that indicates its direction.

This signal 13+ is applied to the up counter 5 in the comparison circuit 42.
2.54 and is applied to down counters 56 and 58, added and subtracted by each counter as described above, and further applied to coincidence detection circuits 62 to 70.

In this example, since the set direction is southeast, the signal B1 itself matches the signal A, and when a pulse occurs in the signal D5, the output signal E1 of the coincidence detection circuit 62 goes to the H level, and the signal E5 goes to the L level. Become.

When this signal E1 becomes H level, the azimuth difference display circuit 44
The output signal Fl of the driver 46 inside becomes H level,
As shown in FIG. 7, segment 78 of indicator 48 lights up to indicate that the current heading matches the set heading.

Next, as shown in FIG. 5, a signal B1 indicating the current heading
When the code becomes "2" indicating "east", this signal Bl is applied to the up counter 52.54 and the down counter 56.58 in the comparator circuit 42 and is added or subtracted in the same manner as described above.

As a result, the signal B2 becomes "low" and coincides with the signal A indicating the set direction, and the output signal E2 of the -number output circuit 64 becomes H level.

When the signal E2 becomes H level, the output signal F2 of the driver 46 becomes H level, and as shown in FIG.
8 segment 82 lights up to indicate that the current heading has shifted by 11 directions and is moving to the "east".

In addition, as shown in FIG. 5, a signal Bl indicating the current heading
When the signal B1 becomes the code "0" indicating "north j", this signal B1 is applied to the up counter 52.54 and the down/color/re 56.58 in the comparator circuit 42 and is added or subtracted in the same manner as described above.

As a result, none of the signals 131-73s match the code "ro" of the set direction, and therefore the -number configuration circuit 62~
The output signals E I - E s of 70 are all at L level.

Therefore, the output signal E6 of the NG detection circuit 72 becomes H level, and the AND gate 50 in the azimuth difference display circuit 44 becomes open.

When this AND gate 50 is in an open state, a clock signal y2 is generated in its output signal F6, and the driver 46 inputting this signal F6 generates this signal F6 in all output signals F1 to F5, and the clock signal y2 is generated in the output signal F6. Display 4 as shown in the figure
All segments 80 to 86 of No. 8 are blinked to indicate that the current heading is deviated by ±2 or more from the set heading.

In this way, in this embodiment, it is possible to display the current heading and the set heading, as well as the difference between the current heading and the set heading.

(f) Effects of the Invention According to the present invention, it is possible to easily grasp at all times whether the current heading matches the heading to the destination and to what extent it deviates by simply looking at the display. , it is possible to eliminate the troubles of the conventional method.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a circuit configuration of a direction display device according to an embodiment of the present invention, FIG. 2 is a diagram showing a detailed circuit configuration of a comparison circuit shown in FIG. 1, and FIG. FIGS. 4 and 5 are time charts, and FIGS. 6 to 9 are diagrams showing the display states of the display. 2... Direction setting circuit, 14... Direction detection circuit, 2nd...
... Azimuth difference calculation circuit, 44... Azimuth difference display circuit. Patent applicant: Rhythm Watch Industry Co., Ltd., Figure 2

Claims (1)

[Scope of Claims] A heading setting circuit that can set a heading toward a destination in advance and outputs a heading setting signal corresponding to the set heading; an azimuth detection circuit that outputs a corresponding azimuth detection signal; an azimuth difference calculation circuit that calculates the difference between the azimuth setting signal and the azimuth detection signal at regular time intervals; An azimuth display device comprising: a azimuth difference display circuit that displays a difference between a set heading azimuth and a current heading.