JPS5935163A - Alarm apparatus for preventing collision - Google Patents

Abstract

PURPOSE:To prevent collision, by a method wherein a plurality of image sensors are arranged to a plurality of focus positions on a preliminarily determined light axis and the position of objective matter is divided into a plurality of regions to be detected from the electric outputs of those sensors. CONSTITUTION:Half mirrors 2a, 2b are pervious to a part of light passing a lens 1 and reflect the residual light. Image sensors 3a, 3b, 3c respectively receive the pervious light from the half mirror 2a, the reflected light from the half mirror 2b and the reflected light from a full reflective mirror 2c. In addition, the image sensors 3a, 3b, 3c are respectively arranged to positions coincided with focusing surfaces corresponding to a long distance L1, a middle distance L2 and a short distance L3. A treating circuit 4 treats electric signals from the aforementioned three image sensors 3a, 3b, 3c and an alarm apparatus 5 lights a lamp or sounds a buzzer by the output from treating circuit 4. By providing the above mentioned mechanism, a proper alarm is provided to a driver corresponding to a danger degree of collision and collision can prevented.

Description

[Detailed Description of the Invention] The present invention relates to a collision/lead prevention warning device that is mounted on a vehicle or the like and issues a collision prevention warning. The system attempts to prevent a collision by detecting the vehicle and issuing a necessary warning depending on the distance and relative speed, allowing the driver to take appropriate measures.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 is a configuration diagram of an embodiment of the present invention, where (1) is a lens, (2a) and (2b) transmit a part of the light that has passed through the lens (1) and reflect the remaining light. Half mirror 1 (2C) Total reflection mirror tear o (3a)
Ga5) (Three are linear image sensors, respectively transmitting light from the half mirror (2a) and half mirror (2b)
) and the reflected light from the total reflection mey-(2c).

Here, the two half mirrors C22) (2b) do not have the optical characteristics of N1, and the amount of light reaching the three image sensors (3a) (3b) (3c) is equal to the sensitive wavelength of the image sensor. IW for any wavelength of light
J-, the ratio of transmittance and reflectance is determined. (4) is the above three image sensors (3a) (3
b) a processing circuit for processing the electrical signal from (3c), (
5) is an alarm device that lights a lamp or sounds a buzzer based on the output from the processing circuit (4).

In addition, the image sensor (3a) has a focal plane corresponding to the long distance, the image sensor (3b) has a focal plane corresponding to the intermediate distance L2, and the image sensor (3C) has a focal plane corresponding to the short distance Ls. are installed at positions that match each.

These sensors have a maximum output when they are in focus, that is, when a source completely focused by the lens (1) is incident, and their output decreases when they are out of focus.

Therefore, in the apparatus configured as shown in this figure, the output of each image sensor when the object L is further away than the first intermediate point M between the long distance and the middle distance Lt is as shown in FIG. As shown, the image sensor (3a) has the highest output, and the output decreases in the order of the image sensor (3b) and the image sensor (3C). Note that when the target object is at the first intermediate point LA, the image sensor (3a) and the image sensor (3b)
The outputs of will be equal. Also, the target object is at medium distance L! When the second intermediate point between L3 and the first intermediate point LA is located between the image sensor (3
The output of b) is maximum.

Furthermore, when the target object approaches the lens side from the second intermediate point LB, the image sensor (3C
) becomes the maximum, and the output of the image sensor (3b) and image sensor (3a) decreases to J[.

As mentioned above, by comparing the outputs of the three image sensors, the position of the target object can be determined in the three areas LA≦L and LB≦L, where L is the distance from the lens (1).
It can be detected separately as ≦Lh and L≦LB.

Also, if the target object gradually approaches, it is far away.

The relative speed of the approaching object can be calculated by measuring the time it takes for the object to pass through the position and reach the intermediate distance L2 position, or the time it takes to reach the short distance position.

The processing circuit (4) is provided with the above function so that the rung of the display device (5) flashes or a buzzer sounds depending on the position and speed of the target object. For example, when the target object is far from the first intermediate point LA If it is located between the first intermediate point LA and the second intermediate point 1/B, the yellow lamp is displayed, and when it is closer than the second intermediate point LB, the red lamp is flashed. If the speed exceeds an arbitrarily set limit and there is a high risk of a collision, the driver can be alerted and take appropriate measures by sounding a buzzer or other methods.

In the above embodiment, a case has been described in which three image sensors are used, but if four or more image sensors are used, even finer divisions of positions can be detected.

As described above, according to the present invention, in a collision prevention warning system, a plurality of image sensors are arranged at a plurality of focal positions on the yC axis determined in advance, and the position of a target object is determined from the electrical outputs of these image sensors. The system detects multiple areas and also detects the relative speed of the target object and issues a warning, giving the driver an appropriate warning depending on the risk of collision and preventing collisions. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a collision prevention warning system according to an embodiment of the present invention, and FIG. 2 shows the output of each image sensor when the target object is farther from the first intermediate point Lm in FIG. 1. figure,
In Fig. 3, the target object is the first object in Fig. 1. Second intermediate point Lm,
FIG. 4 is a diagram showing the output of each image sensor when the target object is between the second intermediate point LB and the lens side. (1) is a lens, (2a) C2b) is a half mirror,
(2C) is a total reflection mirror, (3a) (3b) (3
C) is a linear image sensor, (4) is a processing circuit, (5
) is an alarm device. Agent Shin Kuzuno −

Claims (2)

[Claims] (1) One lens, multiple image sensors placed at multiple predetermined focal positions on the path of light passing through the lens, and the position of the target object determined from the electrical outputs of the multiple image sensors. A collision prevention warning device comprising: a processing circuit that detects areas divided into a plurality of regions; and a warning device that issues a warning in response to an output of the processing circuit that indicates the position of the target object. (2) One lens, multiple image sensors placed at multiple predetermined focal positions on the path of light passing through the lens, and the position of the target object determined from the electrical outputs of the multiple image sensors. a processing circuit that detects the target object by dividing it into a plurality of areas and measures the time it takes for the target object to pass through a plurality of focal point positions to detect the relative velocity of the target object; A collision prevention warning device comprising: a warning device that issues a warning in accordance with an output indicating relative speed.