JPH0133754Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a blind device installed on a side or rear window of an automobile or the like.

For example, in a car, a liquid crystal plate with transparent electrodes is placed inside a double-layered window formed by a transparent plate, and a voltage is applied to the transparent electrodes of this liquid crystal plate to block light from entering the car from outside. A blind device is being considered.

An object of the present invention is to provide such a blind device that can release the blind when the vehicle body moves rearward and secure rear and side visibility.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 11 denotes a liquid crystal plate disposed within a double-layered window (not shown) formed by a transparent plate. This liquid crystal plate 11 has a plurality of (for example, 16) transparent electrodes 13 ₁ , 1 on the surface of a liquid crystal layer 12 .
3 _{2 .} . . 13 ₁₆ are successively provided at equal intervals, and a transparent common electrode is provided on the back surface of the liquid crystal layer 12. For example, when no voltage is applied to the transparent common electrode and the transparent electrodes 13 ₁ , 13 _{2 ,} .
₁ , ₁₃₂ ... ₁₃₁₆ , the electro-optical effect of the liquid crystal layer 12 changes to block (absorb) external light. 1
4 is a back switch that detects when the vehicle body moves rearward. The detection signal output from the back switch 14 is input to a control circuit 15. This control _circuit 15 applies a voltage to the transparent common electrode and the transparent electrodes 13 ₁ , 13 ₂ . When moving backward and a detection signal is input from the back switch 14, it outputs a control signal instructing to stop applying voltage to each of the electrodes. A control signal output from this control circuit 15 is input to a drive circuit 16. Drive circuit 16
receives this control signal and applies a driving voltage to the transparent common electrode and the transparent electrodes 13 ₁ , 13 ₂ . . . 13 ₁₆ of the liquid crystal plate 11.

That is, in this blind device, when the vehicle body moves backward, the detection signal from the back switch 14 stops the voltage application to each electrode of the liquid crystal plate 11 disposed on the side and rear windows, and the blind is closed. This is to be canceled. Therefore, visibility to the sides and rear is ensured, and the vehicle body can be backed up safely.

As described above, according to the present invention, it is possible to provide a blind device that can release the blind and release the side and rear visibility when the vehicle body moves rearward.

[Brief explanation of the drawing]

The drawing is a block diagram of a blind device according to an embodiment of the present invention. 11...Liquid crystal plate, 12...Liquid crystal layer, 13 ₁ , 13 ₂ ...
13 ₁₆ ...transparent electrode, 14...back switch, 15
...Control circuit, 16...Drive circuit.

Claims (1)

[Scope of utility model registration request] It is formed by sealing a liquid crystal layer between a double structure window formed by a transparent plate and a transparent electrode, and detects the backward movement of the vehicle body with the liquid crystal plate disposed between the transparent plates of the window. a control circuit that receives a detection signal from the back switch and outputs a control signal; and a drive circuit that receives a control signal output from the control circuit and applies a drive voltage to the transparent electrode of the liquid crystal plate. A blind device characterized by: