JPS5837041Y2 - back mirror - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a rearview mirror for a vehicle.

While the vehicle is running, it is extremely difficult to judge whether there is enough distance between the vehicle and the vehicle following it to allow it to pass in front of it, using only the image of the vehicle reflected in the conventional rearview mirror. there were.

In view of this, the purpose of this invention is to realize a rearview mirror that makes it easy to judge whether overtaking is possible or not based on the image of the following vehicle.

The embodiment shown in FIG. 1 is a cross section and FIG. 2 is a front view is a mirror made of a transparent glass 1 with a reflective agent 2 attached to the back surface. Two rows of linear light-transmitting portions 3°4 of a constant width are provided along the periphery of the transparent glass 1 with a slight width interval between the periphery and each other, and the light-transmitting portions of the reflective agent 2 A first cavity 5 is formed between the transparent glass 1 whose peripheral edge touches the part between 3 and 4 and which is inward from the peripheral edge.
A first light guide plate 6 with reflective surfaces on both sides, and a concave mirror 7 placed opposite the first light guide plate 6 at an appropriate distance in the first cavity 5 are provided. A transparent glass 1 whose peripheral edge is in contact with the outer part of the transparent part 4 and which is inward from the peripheral edge.
A second light guide plate 9 forming a second cavity 8 is provided between the first light guide plate 6 and the back surface of the first light guide plate 6, and a first light source 10 is provided between the first light guide plate 6 and the concave mirror 7. A second light source 11 is provided between the light guide plate 6 and the second light guide plate 9, and a cover 12 is provided to surround the outside of the second light guide plate 9 and the periphery of the transparent glass 1.

With this configuration, when the first light source 10 emits light, the part of the cavity 5 that is close to the first light guide plate 6 becomes the main light guide path, and the light reaches the transparent part 3, and the second light source 10 emits light. When the light emitting device 11 emits light, the cavity 8 serves as a light guide path and the light reaches the transparent portion 4 .

When this item is attached to a vehicle as a rearview mirror and viewed from the driver's seat, only the transparent portion 3 appears bright when only the first light source 10 emits light, and only the transparent portion 4 appears bright when only the second light source 11 emits light. .

Generally, when the distance from the following vehicle is wide enough to allow overtaking, the image of the following vehicle reflected in the rear-view mirror is quite small compared to the rear-view mirror wheel, so the distance can be determined only by comparing it with the rear-view mirror wheel. is not easy.

Therefore, when the vehicle speed is increased to the normally required speed in preparation for overtaking, when the second light source 11 is turned on, the outer transparent section 4 appears bright, so if the size is determined appropriately, it is possible to It becomes easy to judge the distance by comparing with the video.

Furthermore, when the vehicle speed is further increased and the first light source 10 emits light, the inner translucent portion 3 appears bright, so if the size is set appropriately, the image of the following vehicle will be reduced until it fits within it. Once you have confirmed that you are at a sufficient distance, you can move into the same lane ahead of you.

In this way, by making the transparent parts 3 and 4 easy to see in relation to the vehicle speed, it becomes extremely easy to judge whether or not overtaking is possible.

FIG. 3 shows that in the case of FIG. 1, in which there are two sets of light transmitting parts, light guide means, and light sources, each set of light sources is set at different predetermined ranges of the speed of the rotating magnet 13 of the speedometer. FIG. 2 is a circuit diagram illustrating a control circuit that controls the operation of only one of the following.

The rotating magnet 13 has two sets of N and S poles, and a reed switch 14 placed near the reed switch 14 opens and closes four times per rotation of the rotating magnet 13. Power from the battery 15 is connected to a key switch 16.
The signal is supplied to the control circuit 17 via.

In the control circuit 17, 18 is a stabilized power supply circuit that generates a control reference voltage Vcc and a drive current B.

19 is a monostable multivibrator, and reed switch 1
Each time 4 is closed, a high potential output is produced only for a certain short period of time.

20 is a low-pass filter that outputs a DC voltage that is proportional to the frequency of output pulses of the monostable multi-vibration brake 19, and therefore to the vehicle speed.

21 and 22 are comparators with resistors Rtl and R12, respectively.
The set voltage obtained by dividing the reference voltage Vcc by a voltage divider consisting of a voltage divider consisting of resistors R13 and R14 and the output of the low-pass filter 20 are respectively connected to operational amplifiers OP2. OP
3. When the magnitude relationship is reversed for each, the respective outputs are produced at a and l), and when the vehicle speed is low, a
, l) have no output, at a certain vehicle speed only a has an output, and at other, even higher vehicle speeds, both a and l) have an output.

23 is a selection circuit, and comparatively from 21.22, when neither a nor l) receives input, neither c nor d has an output, and a
When only input is received, only C has an output, and when both a and b receive human power, only d has an output.

24 is a power circuit, and when receiving inputs at c and d, respectively,
A driving current is supplied to only the lamps 11 and 10 to light them.

In this way, as the vehicle speed increases, first only the light-transmitting portion 4 appears brighter, and then only the light-transmitting portion 4 appears brighter.

FIG. 4 shows another embodiment in which the first cavity 5 in FIG.
, first light guide plate 6, concave mirror 7, second cavity 8, second light guide plate 9
, instead of the first light source 10 and the second light source 11, the transparent parts 3 and 4
energized light emitting elements 2 such as light emitting diodes or fluorescent display tubes that emit light when energized individually;
5.26.

In this case, it is necessary to change the power circuit 23 and subsequent parts of the control circuit 17.

According to this invention, by changing the design of the rearview mirror, it becomes easier to judge the distance of a following vehicle when overtaking, which greatly contributes to safe driving.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of one embodiment of this invention, Fig. 2 is a front view thereof, Fig. 3 is a control circuit diagram attached to the embodiment of Fig. 1,
FIG. 4 is a sectional view of another embodiment. 1...Transparent glass, 2...Reflector, 3
, 4... Transparent part, 10.11... Light source, 5, 6.7... Light guide means, 5, 8.9...
...Light guiding means, 13...Rotating magnet, 17...
...control circuit.

Claims (1)

[Scope of utility model registration request] A mirror made of transparent glass with a reflective agent attached to the back surface, which has a transparent part that is locally free of reflective agent and allows light to pass through, and also has a light source on the back surface and a light guide that guides the light from the light source to the transparent part. A rearview mirror with a means.