Abstract An indicating device is provided which comprises a liquid crystal element in plate form disposed in the front part of the device and having a light transmission factor which changes considerably with variation of the voltage applied thereto, a detecting switch for detecting variation of a quantity or condition to be detected, a light emitting diode disposed in the rear of the liquid crystal element, and a reflecting plate for reflecting an external light, wherein the liquid crystal element is connected in parallel with the detecting switch and a resistor for dividing the voltage of a power supply, and in the normal conditions (when the switch is off) a predetermined bias voltage is applied to the liquid crystal element, whereby when a variation of the quantity or condition is detected (when the switch is on), the light transmission factor of the liquid crystal element increases making it nearly transparent and therefore indication of a warning or the like is given by the light from the normally energized light emitting diode, particularly in the daytime the light reflected from the reflecting plate is also added.
An indicating device comprising a liquid crystal element in plate form disposed in the front part of the device and having a light transmission factor which changes considerably with variation of a voltage applied thereto, a detecting switch having an on-off operation for detecting variation of a quantity or condition to be detected and connected electrically to said liquid crystal element, a light emitting diode disposed at the rear of said liquid crystal element, and a reflecting plate for reflecting an incident light passing through said liquid crystal element and disposed behind said liquid crystal whereby when the light transmission factor of said liquid crystal element is caused to increase with reduction of a voltage applied across said liquid crystal, indication of a warning or the like is given by the light emitted from said light emitting diode and passing through said liquid crystal.
Claim 2
Dependent Claim
144 words
An indicating device comprising a liquid crystal element in plate form disposed in the front part of the device and having a light transmission factor which changes considerably with variation of a voltage applied thereto, a detecting switch having an on-off operation for detecting variation of a quantity or condition to be detected and connected electrically to said liquid crystal element, a light emitting diode disposed at the rear of said liquid crystal element, and a reflecting plate for reflecting an incident light passing through said liquid crystal element and disposed behind said liquid crystal whereby when the light transmission factor of said liquid crystal element is caused to increase with reduction of a voltage applied across said liquid crystal, indication of a warning or the like is given by the light emitted from said light emitting diode and passing through said liquid crystal.
Claim 3
Dependent Claim
15 words
An indicating device according to claim 1, wherein said light emitting diode is normally energized.
Claim 4
Dependent Claim
100 words
An indicating device according to claim 1 further comprising resistors for dividing a power supply voltage and applying the power supply voltage divided by said resistors to said liquid crystal element, and wherein said liquid crystal element is connected in parallel with said detecting switch and one of said resistors, whereby practically no voltage is applied across said liquid crystal element when said detecting switch is closed, that is, when a predetermined variation of said quantity or condition is detected, whereas a voltage corresponding to said resistors is applied across said liquid crystal element when said detecting switch is open.