JP2001174763A - Liquid crystal filter for light shielding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light shielding surface having a liquid crystal filter for light shielding. SOLUTION: The light shielding surface for effectively protecting the user's eyes is provided. This light shielding surface has a light shielding filter assembly utilizing liquid crystal and enables a user to easily set a working mode according to work conditions. The light shielding filter assembly has a photodetecting sensor, an input means, a liquid crystal module and a display means and can display the operation mode inputted via this input means on the display means. The liquid crystal filter shields light according to the state displayed on the display means when the photodetecting sensor senses light and the liquid crystal filter resets to the non-light shielding state and does not shield light when the photodetecting sensor does not sense light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding surface such as a disaster prevention surface or a welding work, and more particularly to a light-shielding filter using liquid crystal.

[0002]

2. Description of the Related Art A light-shielding surface using a liquid crystal as a light-shielding filter for protecting eyes from a spark in a welding operation or the like has been conventionally used. For example, there is "Translight Super Vario" (manufactured by LANSEC (registered trademark), Germany) sold by RIKEN OPTECH CORPORATION (Fig. 1).
reference). By using liquid crystal for the light-blocking filter 11 on the light-blocking surface 10, the filter density at the time of light blocking can be variably adjusted. This adjustment of the light-shielding filter density
The user turns the knob 12 when using the light shielding surface.

[0003]

As is apparent from the above configuration, the adjustment of the filter density is performed by the user of the light shielding surface 10 turning the knob 12 by hand.
It was difficult for an actual user to know exactly what the concentration was at the time of use. Further, the light-blocking filter 11 senses light and blocks light only when a predetermined amount or more of spark is generated, and cannot select a return time, so that the response to afterimages of sparks is uniform. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and solves the drawbacks of the conventional light-shielding surface and protects the user's eyes more effectively. The purpose is to provide. The light-shielding surface is provided with a light-shielding filter assembly using a liquid crystal, so that a user can easily set a work mode according to a work situation. According to one aspect of the present invention, a light-blocking filter assembly includes a light receiving sensor, an input unit, a liquid crystal module, and a display unit, and displays an operation mode input via the input unit on the display unit. When the light receiving sensor senses light, the liquid crystal filter performs light shielding according to the state displayed on the display means, and when the light receiving sensor does not sense light, the liquid crystal filter returns to the non-light shielding state. The liquid crystal filter does not shield light.
In a preferred aspect of the present invention, the liquid crystal module is controlled by a liquid crystal drive circuit, and the liquid crystal drive circuit can delay a return time from a light-shielded state to a non-light-shielded state by liquid crystal. In another preferred embodiment, the input means includes an oscillator and a counter,
The operation mode can be continuously changed at predetermined intervals in a continuous input state. In still another preferred aspect, the display means is capable of simultaneously displaying the work type, the delay of the return time, and the light blocking level.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view of the light shielding surface 20 according to the present invention. The light-blocking filter assembly 30 using liquid crystal is removable. FIG. 3 is a plan view of the light shielding filter assembly 30 according to the present invention. The light-shielding filter assembly 30 includes at least one light-receiving sensor 32 on a first surface and a solar cell 31.
And a liquid crystal module 33. FIG. 4 shows a rear view of the light-shielding filter assembly 30. The second surface shown in FIG. 4 includes a liquid crystal module 33, a button 34, and a display unit 35.

FIG. 5 is a schematic block diagram of a circuit for driving the liquid crystal of the light shielding filter. The sensor circuit 101
When the light of the welding is detected by the light receiving sensor 32, the light of the welding is evaluated. The enable circuit 102 controls the operation level and performs a sensitivity adjustment to perform a calibration of a different sensitivity according to a signal from the work type control unit 108. Said
The LCD drive circuit 103 drives the LCD module 104 according to a signal output from the enable circuit 102. Note that all circuits are supplied with power from the solar cell 31 and are backed up by another battery. The other battery is preferably a built-in lithium battery.

By pressing the button 34, the user
The operation type can be selected. In this case, the user may press the button 34 multiple times to select the desired work type.
Can be pressed, but it is also possible to select the work type by holding down the button 34 for a predetermined period using the oscillator 105. The user's input via the button 34 is evaluated by the counter 106, and the evaluated data is decoded and encoded via the decoder 107. The data evaluated by the decoder 107 is transmitted to the work type control unit 108. The work type control unit mainly determines the shade value and sensitivity,
The signal is output to the le circuit 102 and the LCD drive circuit 103. Further, a signal indicating the status of the work type is transmitted to the display 35 for displaying the status of the work type. Thus, the user can check the work type and the shade value on one screen while pressing the button. As an example of the work type, it can be classified into an arc welding type and a TIG welding type. Furthermore, it is possible to provide a delay in the return time of the filter for each type of work. This delay in the return time effectively protects the eyes from the afterimage of the spark. As an example of the shade value,
JIS # 9 to JIS # 12 can be provided. In a preferred embodiment, the operator can simultaneously check the operation mode of the light-shielding liquid crystal module such as the operation type, the delay of the return time, and the shade value on one screen while pressing the input button, thereby improving the operation efficiency. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view of a light-shielding surface according to the related art.

FIG. 2 is a perspective view of a light shielding surface according to the present invention.

FIG. 3 is a plan view of a light shielding filter assembly according to the present invention.

FIG. 4 is a rear view of the light shielding filter assembly according to the present invention.

FIG. 5 is a schematic block diagram of a unit constituting a module of a light-shielding liquid crystal filter according to the present invention.

[Explanation of symbols]

 Reference Signs List 30 light shielding filter assembly 32 light receiving sensor 33 liquid crystal module 34 button 35 display 103 LCD driving circuit 104 LCD module 105 oscillator 106 counter 108 work type control unit

Claims (4)

[Claims] 1. A light-blocking filter assembly comprising a light receiving sensor, an input unit, a liquid crystal module, and a display unit, wherein an operation mode input via the input unit is displayed on the display unit. When the light receiving sensor senses light, the liquid crystal filter performs light shielding according to the state displayed on the display means. When the light receiving sensor does not sense light, the liquid crystal filter returns to the non-light shielding state and returns to the liquid crystal filter. Wherein the light-shielding filter assembly does not shield light. 2. The liquid crystal module according to claim 1, wherein the liquid crystal module is controlled by a liquid crystal drive circuit, and the liquid crystal drive circuit can delay a return time from a liquid crystal light-shielded state to a non-light-shielded state. Shading filter assembly. 3. The light-shielding filter assembly according to claim 1, wherein said input means includes an oscillator and a counter, and is capable of continuously changing an operation mode at predetermined intervals in a continuous input state. 4. The light-shielding filter assembly according to claim 1, wherein said display means can simultaneously display a work type, a delay of a return time, and a light-shielding level.