• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An anti-dazzle rear view mirror incorporates a liquid crystal cell the conductive layers of which are energized by a control voltage in response to light above a threshold intensity impinging on a photoresistor in the control circuit of the cell. A low voltage source, for example a vehicle 12 volt battery, supplies a potential divider which includes the photoresistor, the voltage across which is connected through a logic invertor which controls two logic NAND gates for gating antiphase square wave outputs derived from an oscillator driven from the source to the respective conductive layers of the cell, thereby producing a square-wave voltage across the cell which is double the amplitude of the oscillator output, and decreasing the time taken for the liquid crystal cell to respond to the light intensity change.
    公开号:SU869549A3
    申请号:SU782593395
    申请日:1978-02-24
    公开日:1981-09-30
    发明作者:Бедини Ремо；Де Росси Данило
    申请人:Фиат Сочиета Пер Ациони (Инопредприятие)；
    IPC主号:
    专利说明:

    The invention relates to devices that specify a viewing with adjustable reflectivity for vehicles, mainly for automobiles.
    A rearview device is known, comprising a rearview mirror with adjustable reflectivity, and a reflectance control system. The change in reflectivity is made by pumping a light-absorbing liquid in a closed space in front of the mirror, and the degree of change in reflectivity depends on the amount of liquid [1].
    A rearview device is also known in which the reflective is changed 18 by pumping a light-absorbing liquid in a confined space in front of the mirror, and the pumping speed depends on the illumination of the photosensitive element (2).
    Closest to the technical nature of 20 to the proposed is a rear view device in which the adjustment of reflectivity is performed by changing the transmittance of the liquid crystal element mounted in front of the mirror.
    The rearview device includes a rearview mirror having a liquid crystal element mounted in front of the reflective surface of the mirror, and an electric reflectance control circuitry connected to the onboard power supply network, the control circuitry comprising a light-sensitive photoresistor whose output is connected to the inverter input and a generator alternating voltage, the output of which is connected with the conducting layers of the liquid crystal element (3].
    However, in such a device, an alternating voltage generator is connected to the liquid crystal element through a transformer, which complicates the device and worsens the overall dimensions. The exclusion of the transformer would lead to a decrease in control voltage and poor performance.
    The purpose of the invention is the simplification and improvement of overall dimensions.
    This goal is achieved by the fact that in the rearview device for a vehicle containing a rearview mirror having a liquid crystal element mounted in front of the reflective surface of the mirror, and a reflectivity control circuitry connected to the onboard power supply network, the control circuitry comprising. a light-sensitive photoresistor, the output of which is connected to the inverter input, and an alternating voltage generator, the output of which is connected to the conductive layers of the liquid crystal element, the output of the said generator is connected to the conductive layers of the liquid crystal element through two input logs I of valid two-input elements NO - AND, the first the input of the first element is connected to the output of the alternating voltage generator, the output is connected to the first input of the second element, the second, the inputs of both elements are connected They are connected with the inverter output, and the outputs are with the corresponding conductive layers of the liquid crystal element.
    In FIG. 1 shows a control circuit; on the . FIG. 2 - time diagrams of her work; in FIG. 3 - mirror design.
    The control circuit includes an alternating voltage generator 1, two logic elements NO - AND 2 and 3, an inverter 4, a mirror 5, a photoresistor 6 connected through a resistor 7 to an on-board power supply 8. The first input 9 of the first element 2 is connected to the output 10 of the generator 1. The output 11 of the element 2 is connected to the first input 12 of the element 3. The second inputs 13 and 14 of the elements 2 and 3 are connected to the output 15 of the inverter 4, the input 16 of which is connected to the photoresistor 6 The outputs And and 17 of the elements 2 and 3 are connected to the conductive layers 18 and 19 of the liquid crystal element 20.
    The mirror 5 (Fig. 3) has a housing 21 which holds through the intermediate seal 22 a complex structure formed by a flat polarizing filter 23 closed behind the front glass plate 24, the back plane of which is covered with a layer 18 of transparent conductive material. The conductive layer 18 is in contact with the liquid crystal contained in the element 20.
    The element 20 has a rear glass plate 25 parallel to the plate 24 and coated on the front plane with a layer 19 of transparent conductive material in contact with the liquid crystal in the element 20. The rear plate 25 is closed behind by a flat polarizing filter 26, the optical axis of which is perpendicular to the axis of the filter 23. Filter 26 is closed by a mirror made of a glass plate 27, the back surface of which is covered with reflective material 28. The device operates as follows.
    When the photoresistor 6 is illuminated by rays of light having an intensity less than a certain threshold value determined by the ratio of the resistances of the resistor 7 and the photoresistor 6, the voltage level at the input of the inverter 4 is equal to the logical level “1”. The output 15 of the inverter 10 has a logic level of "0". Then, at outputs 11 and 17 of elements 2 and 3, there are signals with a logic level of “1” (Fig. 2 b, “), i.e. the signals of the generator 1 (Fig. 2 a) do not pass to the liquid crystal element 20 and the voltage on it is zero (Fig. 2 g).
    If, for example, at time T (FIG. 2), the photoresistor 6 is illuminated by light beams having a high intensity, the resistance of the photoresistor decreases and the signal at input 16 of the inverter 10 acquires a logic level of “0”. Then at the output 15 of the inverter 10 appears the level of "1", received at the inputs 13 and 14 of the elements 2 and 3. In this case, the signals of the generator 1 pass through the elements 2 and 3. An alternating voltage is applied to the liquid crystal element (Fig. 2 g) and its light transmission is reduced.
    Thus, a sufficiently large voltage with an amplitude equal to the supply voltage is applied to the liquid crystal element, which allows without the use of a transformer to ensure the normal operation of the device while maintaining high speed
    权利要求:
    Claims (3)
    [1]
    The invention relates to rear-view devices with adjustable reflectance dp of vehicles, mainly d cars. A rear-view device is known, which contains a rearview mirror of a view with an adjustable mirror, a rejuvenating ability, and a system for adjusting the reflectance. The reflectivity is measured by pumping the light-absorbing fluid in a closed space in front of the mirror, and the degree of change in reflectivity depends on the amount of fluid 1. A rearview device is also known in which the change in reflective power is made by pumping the light absorbing fluid in a closed space in front of the mirror, and the speed of pumping depends on the lightness of the photosensitive element 2. The closest in technical essence to the proposed is a device in the rear-view, in which the adjustment of the reflectivity produced by izmeieii about embarks sposobiosti LCD zlementy installed before ee1zhalom. The rear-view device includes a rear-view mirror, having a liquid crystal element, mounted in front of the reflecting surface of the mirror, and an electrical reflecting control circuit, connected to the onboard power supply network, and the control circuit contains a photoresistor that is sensitive to the brightness of the light and the photoresistor, the output of which is connected to the driver's input, which has a cross section of the inverter, which has an octopus of the inverter. g KepaTqi ac voltage, the output of which is connected to the conductive layers of the liquid crystal element {31. However, in such a device, an alternating variable generator is coupled to the liquid-crystal element through a transformer, which complicates the device and improves the mass-output parameters. The exception of the transformer would lead to a lower control voltage and poor performance. The purpose of the invention is to simplify and improve the weight and size parameters. The goal is achieved by the fact that the device for the rear view dp transportochch means, containing a rear-view mirror, a non-icy liquid crystal element mounted in front of the reflecting surface of the mirror, and; The electrical control circuit of the reflective capacitance 50, cnsoaitirvio with the on-board supply network, the control circuit containing a photoresistor sensitive to the intensity of light, the output of which is connected to the input of the inverter, and an alternating voltage generator, the output of which is connected to the conductive cj.oHMJi liquid crystal element, the output of the said generator is connected to the conducting layers / (the crystal element through the left of the inputted logic I of the two-input element NO - I, and the first input of the first element is connected with the output of the alternating generator e1gi, the output - with the first input of the second element, the second, the inputs of both elements are connected H) 1 with the output of HsmepTopa, and the outputs - with the corresponding conductive layers of the liquid crystal element. FIG. 1 shows a control circuit; in fig. 2 time diagrams of her work ;; w FIG. 3 - konstrukts) mirrors. The control circuit contains a variable-voltage generator 1, two logical elements NO — AND 2 and 3, an inverter 4, a mirror 5, a TO resistor 6, connected via a resistor 7 to the on-board power supply 8. The first input 9 of the first element 2 is connected to the output 10 of the generator 1. B1..1 The input 11 of the element 2 is connected to the first input 12 of the element 3. The second inputs 13 and 14 of the elements 2 and 3 connect H) f to the input 15 of the inverter 4, the input 16 of which connected to photoresistor 6. Outputs 11 and 17 of elements 2 and 3 are connected to the conductive layers 18 and 19 of the liquid crystal element 20. Mirror 5 (Fig. 3) has a housing 21 that holds through the intermediate seal 22 a complex structure formed by a neutralizing filter 23, closed from back by a front glass plate 24, rear The curvature of which is covered with a layer 18 of transparent nrovo. A wired layer 18 kotakirust with a liquid crystal, contained in e; 20. The element 20 has a rear glass nlastin 25, a nailedleleg plate 24 and is covered on the front of the site with a layer 19 of transparent transparent conductive material in contact with the liquid crystal in the element 20. The back plastic of the 25 is closed behind a flat zero polarizable light filter 26, the optical axis The filter 26 is covered with a mirror, which is made of glass made of glass 27, and the surface of which is covered with a reflecting-absorbing material. The device works as follows. When the photoresistor 6 is illuminated with rays of light having an intensity, replacing some threshold value determined by the ratio of the resistances of the resistor 7 and the photoresistor 6, the voltage level at the input of inverter 4 is equal to logic level 1. At output 15 of inverter 10 there is a logic level O. Then The outputs of pi 17 of elements 2 and 3 are signals with a logic level 1 (Fig. 2 b, i), i.e. The cHrnaJHii generator 1 (Fig. 2a) does not drop to the liquid crystal element 20 and the voltage across it is zero (Fig. 2). If, for example, at time T (FIG. 2), the photo-coupler 6 is illuminated with rays of high intensity, the resistance of the photoresistor decreases and the signal at the input 16 of the inverter 10 acquires a logic level O. Then the output 15 of the inverter 10 but is level 1, which is not correct to inputs 13 and 14 of elements 2 and 3. At the same time, the signals of generator 1 pass through elements 2 and 3. An alternating voltage is applied to the liquid crystal element (Fig. 2 g) and its light transmission ability decreases. Thus, a sufficiently large 1pc with amnlitude equal to the supply voltage is applied to the liquid crystal element, which allows, without the use of a transformer, to ensure the normal operation of the device while maintaining high performance. The rearview device for a vehicle containing a rear-view mirror having a liquid crystal element mounted in front of the reflecting surface of the mirror and the reflectivity control circuit associated with the side power supply network, the control circuit comprising a photoresistor sensitive to the intensity of light, the output of which is connected to the input of the inverter, and an alternating voltage generator, the output of which is connected to the conductive layers of the liquid crystal element, which in order to simplify and improve the weight and size indicators, the output of the alternating generator and connected to the conductive layers of the liquid crystal element through two entered logical two-input element NO - AND, the first input of the first the first element is connected to the variable voltage generator, - to the first input of the second element, the second inputs of both elements are connected to the output of the inverter, and the outputs - to the corresponding 58695496
    NCI wires 1C1 with layers of liquid crystal-1. French Patent) D 2119463,
    an element.
    Sources of information taken into account in the examination
    cl. B 60 R 1/00, 1972.
    [2]
    2. US patent N 36809S1, to. B 60 R 1/04, 1972.
    [3]
    3. For Italy Italy 67156-А / 77, 1977
    9

    P
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    同族专利:
    公开号 | 公开日
    GB1574674A|1980-09-10|
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    IT1117275B|1986-02-17|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    IT45207/77A|IT1117275B|1977-02-25|1977-02-25|AUTOMATIC METHOD AND DEVICE FOR THE ATTENTION OF THE DRIVING PHENOMENA IN REFLECTED LIGHT|
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