JPH075464Y2 - Optoelectronic automatic anti-glare mirror drive circuit - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a drive circuit for an anti-glare mirror for a vehicle, and in particular, an electrochromic element (hereinafter referred to as ECD) built in an inner mirror and a door mirror by an optical sensor. Alternatively, the present invention relates to an optoelectronic automatic anti-glare mirror driving circuit that individually drives optoelectronic elements made of liquid crystal or the like to automatically adjust the reflectance.

[Prior Art] While driving at night, there is a case in which the rear mirror of the own vehicle receives the rear light from the following vehicle, and the reflected light causes the driver to be dazzled and hinder safe driving.

In order to prevent this, recently, various methods have been proposed in which an optoelectronic element such as an ECD or a liquid crystal is built in a mirror and electrically colored by using a drive circuit for controlling a voltage applied to the element to prevent glare. There is known an antiglare mirror for an automobile, which electrically connects an inside mirror (inner mirror) and an outside mirror (door mirror) incorporating the above-mentioned element and uniformly controls a commonly provided drive circuit by an optical sensor. (See, for example, Japanese Utility Model Publication No. 62-143542).

[Problems to be Solved by the Invention] In a conventional anti-glare mirror that is controlled by a drive circuit that is commonly provided by electrically connecting optoelectronic elements incorporated in an inner mirror and a door mirror, the reflection of the inner mirror and the door mirror is controlled. Since the reflectance is controlled uniformly at the same time, the reflectance is different between the inner mirror with a flat reflecting surface and the door mirror with a convex mirror structure, so the inner mirror feels more dazzling and causes various inconveniences in use. Is occurring.

In order to solve the above-mentioned inconvenience, it is conceivable that the inner mirror and the door mirror are separately made of mirrors having different reflectances at the time of antiglare, but it is not preferable to separately set and manage the manufacturing conditions.

On the other hand, it is required that the inner mirror and the door mirror can individually cope with a sudden change in the ambient light surrounding the vehicle at the time of passing through a tunnel while driving or passing through a downtown area where night lights shine, and the above-mentioned mere manufacturing This is a problem that cannot be solved simply by setting the conditions separately.

An object of the present invention is to provide a drive circuit that solves the above-mentioned inconvenience problem electrically without resorting to changes in the manufacturing conditions of the mirror.

[Means for Solving the Problems] In order to achieve the above object, the optoelectronic automatic antiglare mirror driving circuit of the present invention compares the illuminance level of the rear light detected by the rear light sensor with a predetermined reference level. In the case of adjusting the reflectance of the mirror by outputting the coloring / decoloring signal, the reference voltage level that changes corresponding to the output of the ambient light is individually provided for the inner mirror and the door mirror,
The inner / outer color signals are output separately for the inner mirror and the door mirror, and the output has a hysteresis to cause the flicker of ambient light to cause the flickering of the wear / decoloration signal and the switching range of the color to be erased / erased. The inner mirror and the door mirror are separately provided with a drive unit and a drive power supply circuit which have different widths and which individually adjust the reflectance of the mirror according to the obtained coloration / erasing signal.

That is, the present invention detects the light level behind the vehicle with a rear light sensor, detects the brightness around the vehicle with an ambient light sensor, and outputs an erasing / erasing signal having a forced erasing band due to ambient light, In an anti-glare mirror drive circuit that adjusts the reflectance by controlling the drive voltage applied to the optoelectronic elements built in the inner mirror and the door mirror; two built-in inner mirrors and door mirrors corresponding to the output of the ambient light sensor A voltage level adjusting circuit for an inner mirror and a voltage level adjusting circuit for a door mirror, which set a reference voltage level that varies for each element; a color change signal for comparing each output of the circuit and an output of a rear light sensor And an inner / outer color determining circuit for an inner mirror and an outer mirror for outputting the door mirror; A color-decoloring delay circuit and a color-decoloring delay circuit for door mirrors; two sets of Schmitt circuits attached to the color-delaying delay circuit so that each output of the color-decoloring delay circuit has hysteresis; A drive unit and a drive voltage for individually controlling the drive voltage applied to the optoelectronic element by the delaying / erasing color signal outputted from the wearing / erasing color delay circuit and the side mirror coloring / erasing color delay circuit are supplied. A driving power supply circuit is provided.

Further, a day / night discriminating circuit for the inner mirror and a day / night discriminating circuit for the door mirror, which outputs the day / night discriminating signal by comparing the output of the ambient light sensor with each of the separately set reference voltages; Discrimination delay circuit and day / night discrimination delay circuit for door mirrors; Two sets of Schmitt circuits for hysteresis provided in parallel with each of the delay circuits; Delayed wearing / erasing color signal and delayed day / night discrimination signal of the two sets of inner mirror and door mirror And an inner mirror gate and a door mirror gate that output a coloring / erasing signal having a forced erasing band due to ambient light.

[Operation] Since the present invention has the above-mentioned configuration, the rear light of the following vehicle is input to the rear light sensor, and the sensor detects the light level of the input light and inputs it to the color difference determination circuit of the inner mirror and the door mirror. .

In the coloring / erasing color determination circuit, the reference voltage level for the inner mirror and the reference voltage level for the door mirror that change at appropriate ratios according to the change in the output of the ambient light sensor, and the output of the rear light sensor input as described above. When the rear light level becomes brighter than the reference voltage level, the coloring signals are output respectively, and when the rear light level becomes darker, the erasing signals are output respectively and are individually input to the inner mirror gate and the door mirror gate.

On the other hand, the output of the ambient light sensor is input to the day / night discrimination circuit,
A day / night discrimination signal is output to the gate. Each gate outputs an erasing / erasing signal having a forced erasing band to the inner mirror driving section and the door mirror driving section with respect to ambient light.
The inner mirror driving section and the door mirror driving section are supplied with appropriate voltages from the driving power supply circuits provided in the inner mirror and the door mirror according to the input coloration / decoloration signal, respectively, and the optoelectronic elements incorporated in the inner mirror and the door mirror are supplied. The drive voltage applied to each is controlled to individually adjust the reflectance.

The color-dyeing / erasing signal is compared with the output of the rear light sensor in the color-gating / discoloring judging circuit for the inner mirror and the color-gating / discoloring judging circuit for the door mirror by the reference voltage level which linearly changes in response to the change of the ambient light. Since the operation band of the coloring / discoloring discrimination circuit for the inner mirror operates at a lower illuminance standard than the band of the coloring / discoloration discrimination circuit for the door mirror, the operation is performed as described above. The inner mirror enters the anti-glare state faster than the door mirror when adjusting the reflectance, and the door mirror returns faster when returning from the anti-glare state.

Further, since the color-on / off signal has a forced color erasing band due to ambient light according to the day / night discrimination signal, it is cut during the daytime except in special cases.

In addition, because the output voltage has a hysteresis by installing a Schmitt circuit in the color-on / off color determination circuit and the day / night color determination circuit, when shifting from coloring to erasing, the rear illuminance is low, and the erasing after the transition is performed. When returning to a more colored state, the transition is performed with a high back light illuminance. In the case of forced erasing by ambient light, when the ambient light gets dark and the forced erasing is cut, the surroundings become considerably dark and then cut, and when the ambient light becomes bright and the forced erasing starts, the surrounding becomes considerably bright. After that, it operates so that it can respond sufficiently to sudden changes in ambient light.

[Embodiment] The present invention will be specifically described with reference to the drawings.

<First Embodiment> FIG. 1 is a block diagram showing a first embodiment of the present invention.

As shown in the figure, the present invention sets sensors 31 and 11 for detecting the light levels of ambient light and rear light, and sets reference voltage levels for the inner mirror and the door mirror separately from the output of the ambient light sensor 31. Voltage level adjusting circuits 13 and 23, the reference voltage level set by the circuits, and the rear light sensor 11
Of the inner / outer color discrimination circuits 12 and 22 for the inner mirror and the door mirror, which compare the output of each with the respective color / decoloration signals, and
Color fading delay circuits for inner mirrors and door mirrors that add a time delay to the output of the color fading discrimination circuit 14, 24
A day / night discriminating circuit 32 for comparing the output of the ambient light sensor 31 with a reference set value to output a day / night discriminating signal, a day / night discriminating delay circuit 34 attached to the circuit 32, and an inner / outer color changing delay circuit for the inner mirror. AND of 14 and the output of the day / night discrimination delay circuit 34,
And an inner mirror for forming a logical product of the color-decoloring delay circuit 24 of the door mirror and the output of the day / night discrimination delay circuit 34 to give the color-decoloration signal a forced color erasing band by ambient light in accordance with the day-night discrimination signal. The gates 15 and 25 of the door mirror, and the gates 15 and 25 built in the inner mirror and the door mirror
Optoelectronic elements 1a and 1b driven by a delayed erasing / decoloring signal having a forced erasing band, inner mirror and door mirror driving units 16 and 26 for individually driving the elements, and also separately driving It is composed of driving power supply circuits 2 and 3 for the inner mirror and the door mirror.

The inner / outer color determination circuits 12 and 22 are provided with Schmitt circuits 14a and 24a, respectively, and the day / night determination circuit 32 is provided with a Schmitt circuit 34a.

The rear light sensor 11 detects the light level from the rear vehicle, and the ambient light sensor 21 is a sensor that detects the brightness around the vehicle. The output light voltage decreases when the brightness of the incident light increases. The color difference determination circuits 12 and 22 for the inner mirror and the door mirror are mainly composed of the comparator ICs 12a and 22a, and the reference voltage levels set by the inner mirror and the door mirror voltage level adjusting circuits 13 and 23 at the inverting input terminal, respectively. Is input, and the output of the rear light sensor 11 is input to the non-inverting input terminal, and as the comparison output, the color difference signals for the inner mirror and the door mirror are output. The adjusting circuits 13 and 23 are composed of resistance voltage dividing circuits and resistance-divide the ambient light output to output a reference voltage level.

The reference voltage level input to the IC12 is set to take a higher value than the reference voltage level input to the IC22,
The inner mirror coloration / discoloration determination circuit 12 outputs the coloration / discoloration signal at a light level of the rear light lower than that of the door mirror coloration / discoloration determination circuit 22. The day / night discrimination circuit 32 is mainly composed of a comparator IC 32, the reference voltage 33 is input to the inverting input terminal, the output of the ambient light sensor 31 is input to the non-inverting input terminal, and the day / night discrimination signal is output as a comparison output. .

In addition, the output terminals of the color difference determination circuits 12 and 22 for the inner mirror and the door mirror, and the day and night determination circuit 32 are for the inner mirror and the door mirror, in which the output is delayed by the charging and discharging circuit of the resistor and the capacitor, respectively. The color fading delay circuits 14 and 24 and the day / night discrimination delay circuit 34 are provided, and the Schmitt circuits 14a, 24a and 34a are also provided so as to cope with the flapping of the ambient light of the rear light and the familiarity of the human eye.

The inner mirror gate 15 receives the delayed arrival / erasure signal from the inner mirror arrival / disappearance discrimination circuit 12 via the inner mirror arrival / disappearance delay circuit 14 and the delayed day / night discrimination signal from the day / night discrimination circuit 32 via the day / night discrimination delay circuit 34. And form a logical product with
Further, the door mirror gate 25 ANDs the delayed arrival / erasure signal from the door mirror arrival / disappearance discrimination circuit 22 via the door mirror arrival / disappearance delay circuit 24 and the day / night discrimination signal from the day / night discrimination circuit 32 via the day / night discrimination delay circuit 34. Is formed, and a forced erasing band by ambient light is provided for each of the wearing and erasing signals, and the signals are output to the driving units 16 and 26 of the inner mirror and the door mirror.

The inner mirror driving unit 16 and the door mirror driving unit 26 respectively input the delayed erasing and erasing signals having the forced erasing band from the gates 15 and 25 of the inner mirror and the door mirror, and the inner mirror driving power supply circuit 2 and the door mirror driving power supply. Circuit 3
The drive voltage supplied from the device is applied to the optoelectronic elements 1a and 1b built in the inner mirror and the door mirror to adjust the reflectance.

In FIG. 1, the reference voltage level corresponding to the output of the ambient light sensor and changing for each of the inner mirror and the door mirror is adjusted by the adjusting circuits 13 and 23. The color discrimination circuits 12 and 22 are supplied with the respective signals to compare them with the output of the rear photosensor to output different color-decoloration signals, and to output the delayed color-decoloration signal via an associated delay circuit.

Also, the output of the ambient light sensor is input to the day / night discrimination circuit 32 having a preset reference value, the day / night discrimination signal is output in comparison with the output of the ambient light sensor, and the delayed day / night discrimination is performed via the associated delay circuit. Output a signal.

The delayed arrival / discoloration signals of the inner mirror and the door mirror, which are output separately, are uniformly controlled by the delayed day / night discrimination signal via the gates 15 and 25 of the inner mirror and the door mirror to force them against ambient light. An erasing / erasing signal having an erasing band is output to driving units 16 and 26 provided separately for the inner mirror and the door mirror. for that reason,
It is possible to separately control the reflectance for each of the inner mirror and the door mirror by separately performing the coloration / erasing for the illuminance of the rear light according to the brightness of the ambient light.

In addition, a Schmitt circuit is provided for each of the inner / outer color and the day / night discrimination delay circuit for the inner mirror and the day / night discrimination delay circuit so that a different range due to hysteresis is appropriately provided in the switching range of the color / erasing color signal and the day / night discrimination signal. At the same time, the fluttering of the output of each signal due to a sudden change in ambient light is prevented.

<Second Embodiment> FIG. 2 is a block diagram of a second embodiment in which the day / night discrimination circuit is provided separately for the inner mirror and the door mirror. In the figure, 32R is a day / night discriminating circuit for the inner mirror, and 32D
Compares the reference voltages 33R and 33D, which are individually provided in the day / night discriminating circuit for door mirrors, with the output of the ambient light sensor 31, and outputs day / night discriminating signals for the inner mirror and the door mirror. Day / night discrimination delay circuit 34R, 34D for inner mirror gate 15,
It outputs to the door mirror gate 25. Also,
The day / night discriminating delay circuits 34R and 34D for the inner mirror and the door mirror have the Schmitt circuit 34 as in the case of FIG.
Ra and 34 Da are installed side by side.

In the case of FIG. 2, different from the single reference voltage value in the first embodiment, the day and night discriminating circuit 32R for the inner mirror and the door mirror which are individually operated by the separately provided reference voltage values 33R, 33D, 32D is provided, and the delay arrival / deletion for the inner mirror and the door mirror is output separately from the arrival / disappearance color discrimination circuits 12 and 22 provided for the inner mirror and the door mirror, respectively, via the arrival / disappearance delay circuits 14 and 24, respectively. A day / night discriminating circuit 32 for the inner mirror and the door mirror is applied to the erasing signal.
The delayed day / night discrimination signals output from R and 32D via the delay circuits 34R and 34D are formed by the gates 15 and 25 of the inner mirror and the door mirror. As a result, a delayed erasing / erasing signal having a forced erasing band for the ambient light of the inner mirror and the door mirror is output to the driving units 16 and 26 of the inner mirror and the door mirror.

FIG. 3 shows a block diagram of the drive parts of the inner mirror and the door mirror when the ECDs 10a and 10b are used for the optoelectronic elements incorporated in the inner mirror and the door mirror.

The drive unit 16 for the inner mirror and the door mirror when the ECD is used as an optoelectronic element,
Reference numeral 26 denotes a timer circuit 17 and 27 for driving the inner mirror and the door mirror, which outputs a square wave-shaped erasing / erasing pulse so as to apply a predetermined voltage to the ECD for a predetermined time according to the input delayed erasing / erasing signal having the forced erasing band. And the driving power supply circuits 2 and 3 for the inner mirror and the door mirror by the output of the timer circuit.
Inner mirror and door mirror switching circuit 18, which receives more drive voltage and applies it to the ECD to color it.
28 and composed.

Inner mirror and door mirror drive timer circuits 17, 27
Is, for example, the following configuration, that is, a coloring timer that outputs the coloring pulse that applies a coloring voltage for a predetermined time, and a coloring maintenance device that intermittently outputs an intermittent pulse to maintain the coloring state after coloring. An oscillating circuit and a erasing timer for erasing by applying a voltage for erasing for a predetermined time during erasing may be used.

The switching circuit is composed of a coloring transistor group and a color erasing transistor group by Darlington connection, and receives the input of the color erasing and erasing pulse and applies a forward / reverse driving voltage from a driving power supply circuit to the ECD to perform the color erasing / erasing. Is done.

In the case of FIG. 3, ECDs 10a and 10b are used as the optoelectronic elements in the second embodiment shown in FIG. Driving timer circuits 17 and 27 that output pulses
And a switching circuit 18, 28 for applying a driving voltage to the ECD by the color-decoloring pulse to perform color-decoloring,
When the coloring signal is input, the coloring voltage is applied for coloring for a predetermined time, and after the coloring is finished, the coloring voltage is intermittently applied to maintain the coloring. Is applied to erase the color.

<Specific Circuit and Description of Operation> FIG. 4 is a specific circuit diagram in the case where the ECD is used as the optoelectronic element as shown in FIG.

As shown in the figure, the rear light is voltage-converted by the rear light sensor 11 and output to the non-inverting input terminals of the comparator ICs 12a and 22a of the color difference determination circuits 12 and 22 for the inner mirror and the door mirror. On the other hand, the output of the ambient light sensor is changed to the inverting input terminals of the comparator ICs 12a and 22a through the resistance voltage dividing circuits of the voltage level adjusting paths 13 and 23 for the inner mirror and the door mirror, and corresponding to the changing ambient light. The reference voltage levels are input respectively, and the color fading signals for the inner mirror and the door mirror are output as comparison outputs from the ICs 12a and 22a. The rear light sensor 11 and the ambient light sensor 31 have a characteristic that the output voltage becomes lower as the incident light becomes brighter, and the reference voltage level output from the reference voltage level adjusting circuits 13 and 23 is higher in the inner mirror than in the door mirror. Since the output of the same ambient light sensor is set to take a large value, the inner mirror operates faster than the door mirror when the light level of the rear light becomes bright as shown in FIG. "L" is output as a coloring signal from each of the ICs 12a and 22a.

Color difference judgment circuit 12 for inner mirror and door mirror,
The coloration / decoloration delay circuits 14 and 24 connected to the output terminals of 22 are composed of a charge / discharge circuit of a resistor and a capacitor.A current flows in the direction of a solid arrow when coloring, and a current flows in the direction of a dotted arrow when decoloring.
The coloring / decoloring current output from the coloring / decoloring judging circuits 12, 22 has a delay coloring signal "H" or a delayed coloring / deleting signal "L" with a delay time appropriately set by the coloring / decoloring delay circuits 14, 24. Output to gate 15 and door mirror gate 25.

A color determination circuit for the inner mirror and the door mirror
Since Schmidt circuits 14a and 24a are provided side by side on 12 and 22, and the reference voltage level is changed with the brightness of the ambient light, the brightness of the ambient light changes as shown in FIG. Correspondingly, the illuminance of the back light that fades the color also changes.
In the figure, the solid line Ra indicates the illuminance of the rear light when the inner mirror is discolored, the solid line Rb indicates the rear light illuminance when the inner mirror is discolored, and the dashed-dotted line Da indicates the discoloration of the door mirror. Illuminance of the back light at the time, one-dot chain line Db
Indicates the illuminance of the rear light when the door mirror is colored from erasing, and the inversion of the output of the erasing and erasing signal has a hysteresis width of L ₁ and L _{2 for} the rear illuminance of the inner mirror and the door mirror, respectively.

On the other hand, the day / night discrimination circuit is provided with 32R and 32D separately for the inner mirror and the door mirror.
The individually set reference voltages 33R and 33D are input to the inverting input terminals of IC32Ra and IC32Da, and the output of the ambient light sensor 31 is input to the non-inverting input terminal. When ambient light becomes bright, the output voltage of the ambient light sensor 31 is input. Drops and becomes smaller than the reference voltage
IC32Ra and IC32Da output the daytime signal "L" for the inner mirror and the door mirror, respectively.

Day / night discriminating circuit 32R, 3 for inner mirror and door mirror
The 2D is provided with day / night discrimination delay circuits 34R and 34D for inner mirrors and door mirrors at the output terminals, respectively, as in FIG. 1, and Schmitt circuits 34Ra and 34Da are provided side by side. When switching between “H” and “H”, the illuminance of the input ambient light has a range of hysteresis, and as shown in FIG. 7, for example, the color is forcibly erased during the day and gradually darkens. Both the mirrors and door mirrors shift to the automatic wear / decolor state. Then, when the surroundings start to brighten, automatic erasing and discoloration continue, 3Lux shifts the door mirror to forced erasing, and 6Lux shifts the inner mirror to forced erasing and switches between forced erasing and automatic erasing. Has a hysteresis width of ambient light illuminance of L ₃ and L _{4 for} the inner mirror and the door mirror, respectively.

That is, when the delayed daytime signal “L” is input to the inner mirror gate 15 and the door mirror gate 25, the forced erasing is performed as described above, and when the delayed nighttime signal “H” is input, the forced erasing is cut off. , And shifts to automatic color fading and the delay signal for automatic color fading is output from the gates 15 and 25.

The inner mirror gate 15 and the door mirror gate 25 are NAND gates, and when both inputs are "H",
When the "L" signal is output and the day / night discrimination circuit outputs the night signal, when the coloring signal is output from the coloring / erasing color discrimination circuit, the delayed coloring signal is output from the gates 15 and 25. When "L" is output, and when the night signal is also output, when the color erasing signal is output from the wear / color erasing determination circuit, the delayed color erasing signal "H" is output from the gates 15 and 25. .

The drive units 16 and 26 for the inner mirror and the door mirror are provided with separate drive timer circuits 17 and 27 and a switching circuit.
It consists of 18 and 28. The inner mirror is described below with respect to the configuration and operation of each circuit.

The driving timer circuit 17 includes a coloring timer 17a, a coloring maintaining intermittent pulse oscillation circuit 17b, and an erasing timer 17c.
When the delayed coloring signal "L" from the gate is input to the input terminal 35 of the driving timer circuit 17, a square wave coloring pulse is output from the output gate 36 of the coloring timer 17a to the driving power supply circuit 2
And to the colored transistor group of the switching circuit 18. With this output, the drive power supply circuit supplies a predetermined voltage and the colored transistor group of the switching circuit 18 operates to apply the pulse width of the colored pulse to the ECD. After the square wave colored pulse, the coloring maintaining intermittent pulse oscillating circuit 17b outputs the intermittent pulse from the output gate 37 to the switching circuit 18 since it is already in operation. By the pulse output, the switching circuit 18 applies an intermittent coloring voltage to the ECD to the ECD 10a to maintain the coloring.

Further, when the erasing signal "H" is input to the driving timer circuit 17, the erasing timer 17c operates, and a square wave erasing pulse is output from the output gate 38 to the erasing side transistor group of the switching circuit 18. By the output, the switching circuit 18 operates to apply a driving voltage having a polarity opposite to that at the time of coloring to the ECD 10a by the decoloring pulse width to decolor.

Note that, in FIG. 4, the AU is provided between the inner mirror gate 15 and the inner mirror driving timer circuit 17 and between the door mirror gate 25 and the door mirror driving timer circuit 27.
A six-circuit three-contact changeover switch for three-stage changeover of TO, DAY, and NIGHT is provided (door mirror is not shown). It is also possible to manually switch to DAY (color erasing) or NIGHT (coloring) for coloration / erasing.

According to the present invention, the output of the rear light sensor is separately input to the color determination circuits for the inner mirror and the door mirror so that the sensitivity for the door mirror becomes lower than the sensitivity for the inner mirror by the different reference voltage levels. A color erasing / erasing signal is output after determining the color erasing.

That is, the reference voltage level has a voltage level that linearly changes with the resistance voltage dividing circuits that are separately set with respect to changes in ambient light by the voltage level adjusting circuits 13 and 23 for the inner mirror and the door mirror. . Moreover, since the inner mirror takes a larger value than the output of the ambient light sensor than the door mirror, when there is no ambient light sensor, the situation of flat coloration / discoloration as shown in FIG.
When the ambient light sensor is provided, the state of coloration / decoloration proportional to the ambient light illuminance is shown as shown in FIG.

Further, since the Schmitt circuits 14a and 24a are provided, the backward light illuminance has a width of hysteresis of L ₁ and L ₂ when reversing the output of coloring and decoloring, and when the ambient light becomes bright, the backward light illuminance of wearing and decoloring becomes large. Becomes

Further, a logical product is formed by the delayed arrival and disappearance color signal and the delayed day and night discrimination signal by the inner mirror gate and the door mirror gate, and the forced arrival and disappearance band for the ambient light is provided in the delayed arrival and disappearance signal, which will be described with reference to FIG. As described above, the hysteresis widths of the ambient light illuminance of L ₃ and L ₄ are formed for the inner mirror and the door mirror, respectively.

[Advantages of the Invention] Since the present invention has the above-described configuration, it has the following effects.

According to the invention of claim 1, the rear light level from the following vehicle is detected by the rear light sensor, the brightness around the vehicle is detected by the ambient light sensor, and the output of the rear light sensor is detected by the output of the ambient light sensor. Built-in in the inner mirror and the door mirror by comparing the reference voltage levels of the two separately provided inner mirror and door mirror that change according to the change and separately outputting the color tone signal of the inner mirror and the door mirror. Since the inner mirror and the door mirror are separately provided with a drive circuit and a drive power supply circuit for adjusting the reflectance by applying the optoelectronic element to the inner mirror and the door mirror, the drive circuit does not correspond to the brightness of the ambient light. Since it operates with the back light intensity that is most suitable for each, it is possible to cover the difference in how the inner mirror and the door mirror feel glare.

In the case of claim 2, since the day / night discrimination circuits are separately provided for the inner mirror and the door mirror and the respective day / night discrimination signals are output to the inner mirror gate and the door mirror gate, the coloration / erasing signal of the ambient light is output. The forcible color erasing band can be set separately for the inner mirror and the door mirror, and the automatic anti-glare can be more rationally performed.

With the Schmidt circuit according to claim 1 or 2, it is possible to appropriately provide a hysteresis width at the time of switching to the color-on / off color signal and the day / night discrimination signal, and it is possible to make a more rational transition at the time of shifting to the color erasing and at the time of cutting the forced erasing. it can. Flapping is prevented by sufficiently responding to a rapid change in illuminance of ambient light during the transition.

[Brief description of drawings]

FIG. 1 is a block diagram showing the present invention, FIG. 2 is a block diagram showing a day / night discriminating circuit in FIG. 1 for inner mirrors and door mirrors, and FIG. 3 is an optoelectronic device of the present invention. The drive unit provided in the inner mirror and the door mirror when using the ECD The following block diagram is shown, FIG. 4 is a circuit diagram specifically showing the case where the ECD is used in FIG. 2, and FIG. FIG. 6 is a diagram showing the relationship between the color fading due to the back light illuminance when there is no light, and FIG. 6 is a diagram showing the relationship between the ambient light and the back light illuminance when the color fading is compared with the change in the output of the ambient light sensor. FIG. 7 is a diagram showing forced erasing by the day / night discrimination circuit. 1a, 1b …… Optoelectronic element, 2 …… Inner mirror drive power supply circuit, 3 …… Door mirror drive power supply circuit, 10a, 10b …… ECD, 11 …… Back light sensor, 12 …… Inner mirror color determination Circuit, 13 …… Inner mirror voltage level adjustment circuit, 14 …… Inner mirror color change delay circuit, 15 …… Inner mirror gate, 16 …… Inner mirror drive section, 17 …… Inner mirror drive timer Circuit, 18 …… Inner mirror switching circuit, 22
…… Door mirror color change / discoloration discrimination circuit, 23 …… Door mirror color change / discoloration voltage level adjustment circuit, 24 …… Door mirror color change / delay delay circuit, 25 …… Door mirror gate, 26 …… Door mirror drive unit, 27 …… Door mirror driving timer circuit, 28 ……
Door mirror switching circuit, 31 ... Ambient light sensor,
32R …… Day / night discriminating circuit for inner mirror, 34R …… Day / night discriminating delay circuit for inner mirror, 32D …… Day / night discriminating circuit for door mirror, 34D …… Day / night discriminating delay circuit for door mirror.

Claims (2)

[Scope of utility model registration request] 1. A rear light sensor detects a light level behind a vehicle, an ambient light sensor detects a brightness around the vehicle, and outputs a color-on / off color signal having a forced color erasing band by the ambient light to output the inner light. In an anti-glare mirror drive circuit for adjusting the reflectance by controlling a drive voltage applied to an optoelectronic element incorporated in a mirror and a door mirror; two elements incorporated in the inner mirror and the door mirror corresponding to the output of an ambient light sensor A voltage level adjusting circuit for the inner mirror and a voltage level adjusting circuit for the door mirror that set a reference voltage level that changes for each of the following; An inner / outer color discrimination circuit for outputting inner mirror and door mirror; inner / outer color for inner mirror attached to each of the circuits And a pair of Schmidt circuits provided side by side with the delay circuits and door mirrors to add hysteresis to the outputs from the two color faders and delay circuits; An erasing delay circuit and an erasing and erasing delay circuit for door mirrors, and a driving unit for individually controlling a driving voltage applied to the optoelectronic element by a delayed erasing and erasing signal output from the opt-electronic element and a driving power supply circuit for supplying the driving voltage are provided. An optoelectronic automatic anti-glare mirror drive circuit characterized by the above. 2. A day / night discriminating circuit for an inner mirror and a day / night discriminating circuit for a door mirror, which outputs a day / night discriminating signal by comparing the output of an ambient light sensor with each of reference voltages set separately; A day / night discriminating delay circuit for an inner mirror and a day / night discriminating delay circuit for a door mirror; two sets of Schmitt circuits for hysteresis provided in parallel with each of the two day / night discriminating delay circuits; The optoelectronic automatic anti-glare device according to claim 1, further comprising an inner mirror gate and a door mirror gate, which form a logical product between the inner mirror and the door mirror by the discrimination signal and output a wearing and erasing signal having a forced erasing band by ambient light. Mirror drive circuit.