KR101260725B1 - Optical device for touch screen - Google Patents

Abstract

One embodiment of the present invention relates to an optical device for a touch screen.
To this end, an embodiment of the present invention includes a plurality of optical scanning devices provided on one side of the touch screen, and the optical for the touch screen receives light reflected through the reflective film attached to the other side around one side of the touch screen. And a light splitting device for transmitting a part of light emitted from the light source to the reflecting film and a part of light returning from the reflecting film to a detector, and for transmitting the light emitted from the light source to parallel light. A collimator, a deflection prism for changing the direction of the light, an inclination mirror configured to be inclined at a predetermined angle to the exit surface of the deflection prism, and a mirror for reflecting the incident light again, a detector for detecting the light reflected by the reflective film, the inclination A mirror is attached, and its rotation causes light along the surface of the touch screen to An angle θ of incident light incident on the deflection prism in a state in which the spindle motor to scan and a synchronous detector for detecting the rotational synchronous of the spindle motor are detected, and the light emitted from the deflection prism is vertically emitted to the inclined plane of the inclination mirror; ) Is greater than or equal to 5 °, and less than or equal to 20 °, discloses an optical device for a touch screen.

Description

Optical device for touch screens {OPTICAL DEVICE FOR TOUCH SCREEN}

One embodiment of the present invention relates to an optical device for a touch screen.

Recently, with the development and popularization of the GUI (Graphic User Interface) system, the use of a touch screen with a simple input is becoming common. Such touch screens include resistive film type, capacitive type, optical type, ultrasonic type, electromagnetic type, and vector force type, and each type has advantages and disadvantages.

Looking briefly, the resistive film is a method in which a transparent conductive film between two substrates is in contact with each other and is easily implemented and excellent in touch screen methods. have.

Similar to the optical sensor method, the ultrasonic method has a disadvantage in that it is vulnerable to noise or noise in the factory by determining a position when the sound path between the sound wave generating element and the sound wave recognition element is blocked.

Electromagnetic method uses the principle of magnetism and electromotive force generation of Faraday's law and calculates the coordinates by judging the amount of current flowing through the coil for each position. Since a signal of alternating current must be applied to the coil, a special dedicated pen is needed.

The capacitive method is a method that discriminates the position by sensing the minute current flowing according to the capacitance change between the sensor electrode and the finger, and has a disadvantage in being vulnerable to the noise signal. However, it is strong in environmental reliability and mechanical reliability as the upper barrier layer is changed. It has the advantage of being free to change.

Since the optical method does not use a film for touch recognition in principle, the transmittance is 100%. In addition, the reflection and the decrease in the luminance, the blurring of the display, etc., which occur when the touch panel of another type is attached do not occur. The maintenance of transmittance and brightness in a display is an important factor of quality, which is suitable for such high quality display configurations.

In addition, since the optical touch panel is a method of detecting the coordinates of the light blocking method, the optical touch panel is not detected by physical contact or electrical contact, so that the sensor is not loaded. Accordingly, it is highly reliable and is used for factory monitoring, various automation devices, financial terminals, and the like, and does not use materials such as film or ITO protective film, so that durability of wounds or external shocks is large, and thus there is a low possibility of error such as malfunction.

However, the prior art has a structure in which a module substrate and a complex driving circuit are integrally mounted on a very thick substrate, and thus the touch panel is complicated and bulky, which makes it impossible to apply to a small device. .

In addition, the prior art as described above used a method of displaying on the screen using a separate button-type device or indirectly using a separate screen device connected to the screen. However, due to the development of technology and the development of smartphones and tablet PCs, unlike the conventional technology, it is common for a user to input data and manipulate contents as desired by directly controlling a screen. As a technology for controlling or inputting data by directly touching a screen, various types of products, such as an infrared light emitting device array method, a camera method, and an ITO film method, have been applied or developed.

However, this conventional technology has a problem that the price is expensive and the response speed of the recognition is not fast, and thus the activation of the touch screen application is sluggish.

One embodiment of the present invention, by implementing a touch screen optical device that can be slimmed using a laser light and a fast response speed, the user directly inputs a variety of data such as a simple contact or a character or a picture using a finger or a pen It is an object of the present invention to provide an optical device for a touch screen that gives a specific command.

In addition, an embodiment of the present invention, the laser light is closer to the screen through the slimmer optical device to improve the touch recognition accuracy to reduce the input or operation error, furthermore slimming display products, product freedom of design It is an object of the present invention to provide an optical device for a touch screen in which is increased.

In addition, an embodiment of the present invention, the laser light passing through the touch screen is to provide an optical device for a touch screen that can input data to the coordinates desired by the user by the coordinate calculation.

An optical device for a touch screen according to an embodiment of the present invention includes a plurality of optical scanning devices provided on one side of the touch screen, and receives light reflected through the reflective film attached to the other side around one side of the touch screen. The optical device for receiving a touch screen, wherein the optical scanning device is a light splitter for sending a light source, a portion of the light emitted from the light source to the reflective film and a portion of the light returned from the reflective film to the detector, the light emitted from the light source Collimator to proceed the parallel light, a deflection prism for changing the direction of the light, an inclined mirror formed to be inclined at a predetermined angle to the exit surface of the deflection prism to reflect the incident light again, the light reflected by the reflective film A detector for detecting and the tilting mirror is attached, the touch by the rotation A spindle motor that scans light along the surface of the clean, and a synchronous detector that detects rotational synchronousness of the spindle motor, wherein the deflection prism exits the outgoing light perpendicularly to the inclined plane of the inclined mirror to the deflection prism. The angle θ of incident incident light is greater than or equal to 5 ° and less than or equal to 20 °.

An optical device for a touch screen according to another embodiment of the present invention includes a plurality of optical scanning devices provided on one side of the touch screen, and a reflective rod contacting the touch screen, wherein a reflective film is accommodated at an end of the reflective rod. And a light splitter for transmitting a part of light emitted from the light source to the reflecting film and a part of light returning from the reflecting film to a detector, and parallel light for light emitted from the light source. Collimator to proceed to the, the deflection prism for changing the direction of the light, the inclined mirror formed to be inclined at a predetermined angle to the exit surface of the deflection prism to reflect the incident light back, the detector for detecting the light reflected by the reflective film , The tilting mirror is attached, and the rotation of the touch screen (A) A spindle motor for scanning light along a surface, and a synchronous detector for detecting rotational synchronization of the spindle motor, wherein the light emitted from the deflection prism is incident to the deflection prism in a state in which the light exiting the deflection prism vertically exits the inclined plane of the inclined mirror; The angle θ of the incident light is greater than or equal to 5 ° and less than or equal to 20 °.

And a driving circuit unit connected to the optical scanning device to control driving of the light source, the detector, the spindle motor, and the synchronous detector.

The inclined mirror has a triangular cross section in the optical axis direction, and is formed such that an angle formed by one side of the inclined mirror with the other side connected to an end point of the one side is inclined by 45 °.

The inclined mirror is characterized in that both corners of the deflection prism side are chamfered to achieve a slim structure.

According to an optical device for a touch screen according to an embodiment of the present invention, a slim touch screen using a laser light and a fast response speed optical device can be implemented so that a user directly touches or texts using a finger or a pen. Alternatively, an optical device for a touch screen may be provided that inputs various data such as a picture to give a specific command.

In addition, according to the optical device for a touch screen according to an embodiment of the present invention, the laser light is closer to the screen through a slimmer optical device to improve the touch recognition accuracy to reduce the input or operation error, furthermore, It is possible to slim down and increase the freedom of product design.

In addition, according to an optical device for a touch screen according to an embodiment of the present invention, the laser light passing through the touch screen may input data at coordinates desired by a user by coordinate calculation.

In addition, according to the optical device for a touch screen according to an embodiment of the present invention, it is possible to apply in more various fields such as a large-size TV screen, a white board blackboard, a beam projector.

FIG. 1 is a view showing an optical device for a touch screen and a touch screen device equipped with a reflective film according to an embodiment of the present invention.
2 is a view showing an optical device for a touch screen using a reflective rod with a reflective film according to another embodiment of the present invention.
3 is a view showing the structure of the reflective film of Figures 1 and 2 and the operation of the incident and reflection of light.
4A and 4B are side and bottom views showing the structure of an optical device for a touch screen according to the present invention.
5 is a view showing a specific shape of the inclined mirror of the optical device according to the present invention.
6 is a view showing a change in the optical path according to the change of the incident angle in the optical device according to the present invention.
7 is a circuit diagram illustrating a standby power saving unit of the driving circuit unit of FIG. 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

1 is a view showing an optical device for a touch screen and a touch screen device equipped with a reflective film according to an embodiment of the present invention, Figure 2 is a touch screen using a reflective rod with a reflective film according to another embodiment of the present invention 3 is a view showing the optical device for the optical device, Figure 3 is a view showing the structure and the operation of the light incident and reflection of the reflective film of Figures 1 and 2, Figures 4a and 4b shows the structure of the optical device for a touch screen according to the present invention Figure 5 is a side view and a bottom view, Figure 5 is a view showing a specific shape of the tilting mirror of the optical device according to the present invention.

1 to 5, an optical device for a touch screen according to an embodiment of the present invention includes a plurality of optical scanning devices 21 and 22 provided on one side of the touch screen A, The device receives light reflected through the reflective film 30 attached to the other surfaces 1b, 1c, and 1d around one side 1a of the touch screen A.

The present optical device for touch screen is a touch sensor module 20 installed on the upper side (or side / lower surface) of the large screen A. The touch sensor module 20 is composed of a plurality of optical scanning devices 21 and 22. It is. For example, the touch sensor module 20 is installed on the upper portion of the large screen A, and consists of two optical scanning devices M1 21 and M2 22. Here, the three surfaces 1b, 1c, and 1d other than the touch sensor module 20 are attached to the reflective film 30 so that light incident on the reflective film 30 is incident as shown in FIG. 2. Reflected in the opposite direction to send to the touch sensor module (20).

On the other hand, as shown in Figure 2, the optical device for a touch screen using a reflective rod with a reflective film according to another embodiment of the present invention, compared to Figure 1, the reflective film on three surfaces other than the surface on which the optical device is mounted The laser is emitted when the touch screen A is touched because the reflecting film 30 is separately accommodated at the end of the reflecting rod 31 (for example, a pen or a rod) directly contacting the touch screen. After the light reaches the reflective film 30 provided in the reflecting rod 31, the light is returned to the detector 270 in the reverse order of the direction in which the light is returned and reflected.

Each of the optical scanning devices 21 and 22 constituting the touch sensor module 20 has a light source 210 emitting laser light and a scanning direction of the light source 210 as shown in FIG. 4. Arranged light splitter 220, collimator (CL) 230, deflection prism (BSP) 240, tilt mirror (MR) 250, detector (PD) 270, spindle motor 225, synchronous detector 260. In other words, the optical device for the touch screen may include the above-described configuration, and perform the function of the transmitter and the receiver for the incident laser light.

On the other hand, the touch screen (A) is formed in a square or rectangular plate shape made of a transparent glass or plastic material. The touch screen A may be used in various fields such as a TV screen, a white board blackboard, a beam projector, and the like.

The light source 210 is a laser light emitted on the touch screen A and has a visible light or an infrared wavelength. Meanwhile, in FIGS. 1 to 4, the light transmitted from the light source 210 is indicated by a thick arrow, and the light received by the detector is indicated by a relatively thin arrow.

Although not shown, the rear end of the light source 210 is provided with a light amount adjusting unit for adjusting the amount of light emitted from the light source 210. The light amount adjusting unit may adjust the amplitude, or intensity, of the light within a predetermined range according to the amount of light that the touch screen A can accommodate. In addition, an optical attenuator for reducing the amount of light emitted or an optical density filter for filtering the light density to a desired amount is used as the light amount adjusting unit.

The collimator 230 allows divergent light to travel in parallel without spreading in all directions.

The light splitter 220 is installed at one side of the collimator 230 and the light source 210 to send a part of the light to the reflective film 30 and detect a part of the light returned from the reflective film 30. Forwarded to 270. In addition, the installation position of the light splitter 220 may be changed according to the position of the detector 270.

The deflection prism 240 is a device for changing the direction of the light emitted from the light source 210, the inclined mirror 250 is provided on the exit surface of the deflection prism 240 to reflect the incident light again. . In addition, the deflection prism 240 is temporarily fixed by a gripper, and a transparent ultraviolet curable resin is coated on each contact surface. The ultraviolet curable resin is cured by ultraviolet rays in a state where the deflection prism 240 is completely fixed. In addition, the gripper supports the deflection prism 240 and serves to connect the driving circuit unit 10 so that the deflection prism 240 can be driven. In addition, the inclination mirror 250 has an angle θ of incident light incident on the deflection prism 240 while the outgoing light of the deflection prism 240 is emitted perpendicularly from the inclination surface of the inclination mirror 250. It is preferably formed greater than or equal to 5 ° and less than or equal to 20 °.

More specifically, the deflection prism 240 serves to achieve a thinning (that is, slimming) by changing the direction of incident light, and the angles A and β between the A plane, the B plane, and the C plane, respectively. and γ. When the light exits, the light proceeds in the order of refraction (A surface), reflection (B surface), reflection (C surface), and refraction (B surface) in the order that light is incident on the deflection prism 240. When the reflected light returns, the process proceeds in reverse. Particularly, the B surface exhibits refraction and total reflection depending on the incident angle of light. In addition, if the angle θ of the incident light incident on the deflection prism 240 is properly disposed under the condition that the outgoing light of the deflection prism 240 exits from the inclined plane of the inclined mirror 250, the entire touch sensor may be used. The module can be thinned. In this case, the incident angle of the light is preferably greater than or equal to 5 ° and less than or equal to 20 °. Here, when the angle θ of the incident light is smaller than 5 °, the light transmitting part and the light receiving part constituted by the collimator 230, the light splitter 220, and the detector 270 may be lowered below the deflection prism 240. When the angle θ is greater than 20 °, the Do / Di becomes too large, the assembly sensitivity becomes high, and the manufacturability becomes difficult. Therefore, in the present optical device for touch screens, the angle of incident light θ It is important to keep the range of b) greater than or equal to 5 ° and less than or equal to 20 °.

In addition, if the diameter Di of the incident light and the diameter Do of the exiting light of the deflection prism 240 are appropriately adjusted, the overall effective light efficiency may be increased to suppress heat generation or power consumption of the touch sensor module. On the other hand, Do or Di can be measured by a device for measuring the light distribution (profile).

The inclined mirror 250 is formed to be inclined at a predetermined angle to the exit surface of the deflection prism 240 to reflect the incident light again. The inclined mirror 250 is preferably formed such that the cross section in the optical axis direction has a triangular shape, and the angle formed by one side with the other side connected to the end of the one side is inclined by 45 °. Accordingly, the inclined mirror 250 used in the present invention is formed in a triangular shape (see FIGS. 5A and 5B) including a 45 ° inclined plane, and then returns to a path where the light incident from the deflection prism 240 is reflected and incident. You can get out.

The laser light emitted from the light source 210 is transmitted through the light splitter 220, the collimator 230, the deflection prism 240, and the tilting mirror 250, and the touch is caused by the rotation of the spindle motor 225. The light is scanned along the screen A surface. In addition, the spindle motor 225 may adjust the angle and position of the deflection prism 240 to adjust the incident angle, the exit angle, the diameter Di of the incident light and the diameter Do of the exiting light. On the other hand, the light reflected from the reflective surface of the touch screen (A) is detected by the detector 270 through the inclined mirror 250, the deflection prism 240, the collimator 230, the light splitter 220. At this time, the detector 270 is a device that converts the light energy into electrical energy using a photodiode or phototransistor.

In addition, the optical scanning device is provided with a rotating synchronous detector 260 on one side of the spindle motor 225, to detect the synchronization of the rotation of the spindle motor 225, respectively. The rotational synchronization of the spindle motor 225 serves as a reference for signal detection.

The driving circuit unit 10 is installed at one side of the optical scanning device to control the driving of the light source 210, the detector 270, the spindle motor 225, and the synchronous detector 260. Although not shown, respective controllers for controlling the driving of the detector 270 and the synchronous detector 260, the motor driving controllers 13a and 13b, and the light source controllers 14a and 14b may be installed. In addition, the driving circuit unit 10 may precisely control the spindle motor 225 through the motor driving control units 13a and 13b. In addition, the driving circuit unit 10 further includes a central processing unit 12 capable of decomposing an image displayed on the touch screen A to determine a maximum sharpness within a range of a predetermined resolution. Can be judged in the range.

On the other hand, the position of the point (x, y) on the operation of the touch screen (A) can be determined by the two optical scanning device. The optical device for touch screens detects angles detected by the first optical scanning device M1 and the second optical scanning device M2 through the central processing unit 12 of the driving circuit unit 10, and the two line segments cross each other. It works on the principle of recognizing a point as (x, y). That is, when a user touches a specific portion of the touch screen A with a finger, the generated signal is transmitted to the driving circuit unit 10 to perform an operation, and accurate coordinate calculation is performed through the central processing unit 12. Will be able to perform

The optical device for the touch screen configured as described above includes a light transmitting part including a laser light, a collimator 230, a light splitter 220, a deflection prism 240, and a detector 270 for thinning (slimming) the optical scanning device. The light receiving portion can be made slim.

Therefore, according to the present optical device for touch screen, the optical device that uses a spindle motor 225 and a laser to directly contact a user using a finger or a pen or input various data such as a character or a picture to give a specific command. In particular, by realizing a compact optical device, the laser is brought closer to the screen A, thereby reducing the error of input or operation. In addition, according to the optical device for the touch screen, it can be applied to a wider range of fields such as a large-size TV screen, a white board blackboard, a beam projector screen.

As described above, when the touch sensor module is thinned (slim), the light scanned from the light source 210 is brought into close contact with the surface of the screen A so that the touch recognition accuracy can be improved. There is an advantage that is possible and the degree of freedom of product design is increased. In addition, the laser passing through the screen A by the optical device provides a function that enables the user to enter data in the desired coordinates by the coordinate calculation.

Meanwhile, as shown in FIGS. 5A and 5B, the inclined mirror 250 of the optical device for the touch screen is formed in a triangular shape including a 45 ° inclined surface, and both edge portions of the deflection prism 240 side are chamfered. It is. This is to reduce the thickness of the optical device for the present touch screen. Preferably, both edges of the deflection prism 240 side of the inclined mirror 250 are chamfered to a size of 0.3 mm or more from the end.

6 is a view showing the optical path change according to the change of the incident angle in the optical device according to the present invention.

As shown in (a), (b) and (c) of FIG. 6, in the optical device according to the exemplary embodiment, the light emitted from the deflection prism 240 is perpendicular to the inclined surface of the inclined mirror 250. The change in the optical path may be observed by adjusting the angle θ of the incident light incident on the deflection prism 240 under the condition of emitting light.

In addition, the material of the said deflection prism 240 in the following Table 1 data is the data detected using the B270 (Schoot company) model of refractive index about 1.52.

Case-1 (Normal) Case-2 (Min) Case-3 (Max) Angle α (Degree) 33.5 33.5 33.5 Each ß (Degree) 19 25.5 16.1 Angle θ (Degree) 11.90 5.12 19.80 Do / Di 1.9084 1.5523 3.2536

As described above, when the angle θ of the incident light incident on the deflection prism 240 is smaller than 5 °, the transmitter and the light receiver including the collimator 230, the light splitter 220, and the detector 270 may be disposed. It is difficult to have a slimmer structure because it is lowered below the deflection prism 240. When the angle θ is greater than 20 °, the Do / Di becomes too large to increase the assembly sensitivity and make the production difficult. In the optical device for touch screens, it will be important to maintain the range of the incident light angle θ to be greater than or equal to 5 ° and less than or equal to 20 °.

7 is a circuit diagram illustrating a standby power saving unit of the driving circuit unit of FIG. 1.

Referring to FIG. 7, the standby power saving unit 11 of the driving circuit unit 10 of the optical device for touch screen according to the present invention refers to a power adapter, and includes a start circuit 110 and a switching power supply circuit 120. , The first electric double layer capacitor 130, the first control signal generator circuit 140, the second electric double layer capacitor 150, the second control signal generator circuit 160, the photocoupler 170, and the logic circuit 180. It includes. Here, the start circuit 110, the second electric double layer capacitor 150, the second control signal generation circuit 160 and the logic circuit 180 is connected to the power ground (3), the first electric double layer capacitor 130 and the first control signal generation circuit 140 are connected to the device ground (4). In addition, the switching power supply circuit 120 and the photocoupler 170 are connected to both the power ground 3 and the device ground 4. Accordingly, the standby power saving unit 11 is a component constituting the electronic device 5 (that is, the driving circuit unit) having a relatively low potential and the power supply ground 3 side to which the high voltage AC power supply 1 is directly supplied. The device ground (4) side to which all the components driven by the power supply are connected is electrically connected to each other while maintaining high insulation characteristics through the switching power supply circuit 120 and the photocoupler 170.

The start circuit 110 sends a start current to the logic circuit 180 when the power cord of the standby power saving unit 11 is first connected to the AC power source 1. At this time, the start circuit 110 is triggered by a sudden power supply voltage change to send a start current to the logic circuit 180. The logic circuit 180 receiving the start current from the start circuit 110 sends a bias current to the switching power supply circuit 120. That is, the start circuit 110 sends a start current when the power cord of the standby power saving unit 11 is first connected to the AC power source 1 to supply a bias current to the switching power supply circuit 120 through the logic circuit 180. It serves to supply.

In addition, the start circuit 110 stops the operation when the second charge resumption signal of the second control signal generation circuit 160 is changed from high (H) to low (L). Once stopped, the start circuit 110 does not operate permanently unless the AC power supply 1 is interrupted and supplied again due to a power failure or the power cord is disconnected and then reconnected.

The switching power supply circuit 120 converts a high voltage DC power supplied through the rectifier 2 to charge the first electric double layer capacitor 130 and the second electric double layer capacitor 150. The switching power supply circuit 120 includes a first output terminal (A) and a second output terminal (B). The switching power supply circuit 120 charges a first electric double layer capacitor 130 through the first output terminal A and a second electric double layer capacitor 150 through the second output terminal B. Let's do it.

The first electric double layer capacitor 130 is charged with the output current of the first output terminal A of the switching power supply circuit 120. The first electrical double layer capacitor 130 supplies power to the first control signal generation circuit 140, and supplies power to the electronic device 5 through an output terminal of the power adapter 100.

The first control signal generation circuit 140 measures the state of charge of the first electric double layer capacitor 130 to generate a first control signal. Here, the first control signal is transmitted to the logic circuit 180 through the photocoupler 170. The first control signal generation circuit 140 includes a first current detection circuit 141, a first differential circuit 142, a first voltage detection circuit 143, and a first flip-flop circuit 144.

The first current detection circuit 141 detects the charging current of the first electric double layer capacitor 130 and outputs a high signal to the first differential circuit 142 when the charging current is lower than the threshold current.

The first differential circuit 142 differentiates the high signal of the first current detection circuit 141 to generate a first charge stop signal having a short pulse width and send it to the first flip-flop circuit 144.

The first voltage detection circuit 143 detects the charging voltage of the first electric double layer capacitor 130 and generates a first charging resumption signal when the charging voltage is lower than a threshold voltage to generate the first flip-flop circuit 144. Send to

The first flip-flop circuit 144 outputs a set terminal receiving an output signal of the first voltage detection circuit 143, a reset terminal receiving an output signal of the first differential circuit 142, and a first control signal. It includes an output terminal.

The first flip-flop circuit 144 is set by the first charge resume signal received through the set terminal to output a high signal to the output terminal Q as a first control signal. That is, the first flip-flop circuit 144 is set by the first charge resumption signal received from the first voltage detection circuit 143 to output a first control signal having a high, and the first control The signal is transmitted to the logic circuit 180 through the photocoupler 170. The first flip-flop circuit 144 maintains the state of the output terminal Q high until the reset terminal R receives the first charge stop signal.

The first flip-flop circuit 144 is reset by the first charge stop signal received through the reset terminal R to output a low signal as a first control signal to the output terminal Q. . That is, the first flip-flop circuit 144 is reset by the first charge stop signal received from the first differential circuit 142 to output a first control signal having a row, and the first control. The signal is transmitted to the logic circuit 180 through the photocoupler 170. The first flip-flop circuit 144 keeps the state of the output terminal Q low until a first charge resuming signal enters the set terminal S.

The second electric double layer capacitor 150 is charged with the output current of the second output terminal B of the switching power supply circuit 120. The second electric double layer capacitor 150 supplies power to the second control signal generation circuit 160.

The second control signal generation circuit 160 measures the state of charge of the second electric double layer capacitor 150 to generate a second control signal. Here, the second control signal is transmitted to the logic circuit 180. The second control signal generation circuit 160 includes a second current detection circuit 161, a second differential circuit 162, a second voltage detection circuit 163, and a second flip-flop circuit 164.

The second current detection circuit 161 detects the charging current of the second electric double layer capacitor 150 and outputs a high signal to the second differential circuit 162 when the charging current is lower than the threshold current.

The second differential circuit 162 differentiates the high signal of the second current detection circuit 161 to generate a second charge stop signal having a short pulse width and send it to the second flip-flop circuit 164.

The second voltage detecting circuit 163 detects the charging voltage of the second electric double layer capacitor 150 and generates a second charging resumption signal when the charging voltage is lower than a threshold voltage to generate the second flip-flop circuit 164. Send to

The second flip-flop circuit 164 may include a set terminal S receiving an output signal of the second voltage detection circuit 163, a reset terminal R receiving an output signal of the second differential circuit 162, and And an output terminal Q for outputting the second control signal.

The second flip-flop circuit 164 is set by the second charge resuming signal received through the set terminal S to output a high signal to the output terminal Q as a second control signal. That is, the second flip-flop circuit 164 is set by the second charge resumption signal received from the second voltage detection circuit 163 to output a second control signal having a high value, and the second control. The signal is transmitted to the logic circuit 180. The second flip-flop circuit 164 maintains the state of the output terminal Q high until a second charge stop signal is input to the reset terminal R.

The second flip-flop circuit 164 is reset by the second charge stop signal received through the reset terminal R to output a low signal to the output terminal Q as a second control signal. . That is, the second flip-flop circuit 164 is reset by the second charge stop signal received from the second differential circuit 162 to output a second control signal having a row, and the second control. The signal is transmitted to the logic circuit 180. The second flip-flop circuit 164 maintains the state of the output terminal Q low until a second charge resuming signal is input to the set terminal S.

The photocoupler 170 transfers the first control signal generated by the first control signal generation circuit 140 from the device ground 4 side to the power ground 3 side while maintaining a high insulation state.

The logic circuit 180 is generated by the start current supplied from the start circuit 110, the first control signal generated by the first control signal generation circuit 140, and the second control signal generation circuit 160. The logic sum OR of the second control signal is obtained to supply or cut off the bias current to the switching power supply circuit 120. That is, the logic circuit 180 controls the switching power supply circuit 120 by supplying or blocking a bias current to the switching power supply circuit 120.

For example, when the logic circuit 180 receives a start current from the start circuit 110 or when the first control signal is high or the second control signal CC2 is high, a bias current is applied to the switching power supply circuit 120. Supply. Accordingly, the switching power supply circuit 120 charges the first electric double layer capacitor 130 and the second electric double layer capacitor 150. That is, the logic circuit 180 supplies a bias current to the switching power supply circuit 120 when at least one of the start current, the first control signal, and the second control signal is high.

For example, when the logic circuit 180 does not receive a start current from the start circuit 110 and the first control signal is low (L) and the second control signal is low, the logic circuit 180 is supplied to the switching power supply circuit 120. Shut off the bias current. Accordingly, the switching power supply circuit 120 stops charging of the first electric double layer capacitor 130 and the second electric double layer capacitor 150. That is, the logic circuit 180 cuts off the bias current supplied to the switching power supply circuit 120 when the start current, the first control signal, and the second control signal are all low. At this time, when the logic circuit 180 cuts the bias current and the operation of the switching power supply circuit 120 is stopped, the power loss of the standby power saving unit 11 observed from the AC power source 1 is zero. Becomes

As described above, the standby power saving unit 11 completely cuts off the AC power supply 10 in the standby state, thereby making the standby power loss observed from the outside zero. In addition, the standby power saving unit 11 charges the electric double layer capacitor using the switching power supply circuit 120, and supplies the charging voltage to the power source of the electronic device 50. When the charging voltage of the electric double layer capacitor falls below the threshold voltage, the switching power supply circuit 120 is operated for a short time of several seconds or several tens of seconds to charge the electric double layer capacitor. Accordingly, the standby time of the standby power saving unit 11 can be made infinite. In addition, since the standby power saving unit 11 detects the charging current of the electric double layer capacitor and commands the stop of charging, the standby power saving unit 11 is not affected by the charging voltage and can perform stable and precise control.

What has been described above is only one embodiment for implementing the present optical device for touch screen, and the present invention is not limited to the above embodiment, and as claimed in the following claims, it is beyond the scope of the present invention. Without departing from the scope of the present invention, those skilled in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

A: touch screen 10: driving circuit unit
20: touch sensor module 21, 22: optical scanning device
30: reflecting film 31: reflecting rod
210: light source 220: light splitter
225: spindle motor 230: collimator
240: deflection prism 250: tilting mirror
260: synchronous detector 270: detector

Claims (5)

A plurality of optical scanning devices (21, 22) provided on one side (1a) of the touch screen (A), the other side (1b, 1c, 1d) around one side (1a) of the touch screen (A) Optical device for a touch screen that receives the light reflected through the reflective film 30 attached to the,
The optical scanning device includes a light source 210, a light splitter 220, a collimator 230, a deflection prism 240, a tilt mirror 250, a detector 270, a spindle motor 225, and a synchronous detector 260. Including,
The light splitter 220 is installed at one side of the light source 210 to send the light emitted from the light source 210 to the reflective film 30 and the light returned from the reflective film 30 to the detector 270. The collimator 230 is installed between the light splitter 220 and the deflection prism 240 so that the light emitted from the light source 210 proceeds to parallel light, and the deflection prism 240 Is installed between the collimator 230 and the inclined mirror 250 to change the direction of the light from the collimator 230, the inclined mirror 250 at a predetermined angle to the exit surface of the deflection prism 240 It is formed to be inclined to reflect the incident light again, the detector 270 is installed on the side opposite to the collimator 230 side direction from the light splitter 220 to detect the light reflected by the reflective film 30 And said The inclined mirror 250 is attached to one surface of the motor 225, and the light is scanned along the surface of the touch screen A by the rotation thereof, and the synchronous detector 260 is the spindle motor 225. Is installed to be spaced apart from the inclined mirror 250 on one surface of detects the rotational synchronization of the spindle motor 225,
The angle θ of the incident light incident on the deflection prism 240 in a state in which the outgoing light of the deflection prism 240 exits the inclined plane of the inclined mirror 250 is greater than or equal to 5 ° and 20 ° Optical device for a touch screen, characterized in that formed smaller or equal. A plurality of optical scanning devices (21, 22) provided on one side of the touch screen (A) and a reflective rod 31 for contacting the touch screen (A), the reflective film at the end of the reflective rod 31 30 is a touch screen device accommodated,
The optical scanning devices 21 and 22 may include a light source 210, a light splitter 220, a collimator 230, a deflection prism 240, an inclined mirror 250, a detector 270, a spindle motor 225, and a synchronous motor. Including a detector 260,
The light splitter 220 is installed at one side of the light source 210 to send the light emitted from the light source 210 to the reflective film 30 and the light returned from the reflective film 30 to the detector 270. The collimator 230 is installed between the light splitter 220 and the deflection prism 240 so that the light emitted from the light source 210 proceeds to parallel light, and the deflection prism 240 Is installed between the collimator 230 and the inclined mirror 250 to change the direction of the light from the collimator 230, the inclined mirror 250 at a predetermined angle to the exit surface of the deflection prism 240 It is formed to be inclined again to reflect the incident light, the detector 270 is installed on the side opposite to the collimator 230 side direction from the light splitter 220 to detect the light reflected by the reflective film 30 And said The inclined mirror 250 is attached to one surface of the motor 225, and the light is scanned along the surface of the touch screen A by the rotation thereof, and the synchronous detector 260 is the spindle motor 225. Is installed to be spaced apart from the inclined mirror 250 on one surface of detects the rotational synchronization of the spindle motor 225,
The angle θ of the incident light incident on the deflection prism 240 in a state in which the outgoing light of the deflection prism 240 exits the inclined plane of the inclined mirror 250 is greater than or equal to 5 ° and 20 ° Optical device for a touch screen, characterized in that formed smaller or equal. The method according to claim 1 or 2,
A driving circuit unit 10 is connected to the optical scanning devices 21 and 22 to control driving of the light source 210, the detector 270, the spindle motor 225, and the synchronous detector 260. Optical device for a touch screen, characterized in that. The method according to claim 1 or 2,
The inclined mirror 250 has a triangular cross section in the optical axis direction, and an angle formed at one side thereof with the other side connected to an end point of the one side is inclined at 45 °. . 5. The method of claim 4,
The inclined mirror 250 is a touch screen optical device, characterized in that both edges of the deflection prism 240 side is chamfered more than 0.3mm.

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