KR20070066810A - Pressure sensor module through optical path - Google Patents

Abstract

A pressure sensor module through an optical path is provided to enhance precision and perform operation in a bent state of a touch screen and skin/hand of a robot by converting an analog signal into the digital signal in each optical path. A Y optical path layer(2) includes a plurality of Y optical paths connected to an XY light supply path(12) on a 2D(Dimensional) base film(1). An XY optical path boundary layer(3) is formed on the Y optical path layer. An X optical path layer(4) including the plurality of X optical paths(10) connected to the XY light supply path on the XY optical path boundary layer. A touch surface made by a surface film(5) is formed on the X optical path layer. An LED(Light Emitting Diode)(6) supplies light to the XY light supply path. The light is transferred to an X/Y CCD(Charge Coupled Device)(7,8) through the optical path. An MPU(Micro Processor Unit)(9) calculates and transfers a center position of a touched part to an external device through an interface by calculating a touch signal received from the X/Y CCD based on a reference value.

Description

Pressure sensor module through optical path {AA}

1.Base film 2.Y light path layer 3.X, Y light path boundary layer

4.X light path layer 5.Surface film 6.LED

7.X CCD 8.Y CCD 9.MPU

10.X light path 11.Y light path 12.XY light path

13.Partial Magnification 14.Front Sectional View

Touch screen, a new input method that can replace input devices such as mouse and keyboard, is currently used in countless fields such as PDA, LCD, CRT, banks and government offices, various medical equipment, tourism and major organizations, and traffic guidance. This is how it is applied.

When you touch the screen directly with a finger or ballpoint pen, the screen is designed to recognize the contact and execute a command or move the cursor position.

The method developed to improve the precision of the screen is to charge the electric charge (current flow) on the screen surface, install sensors around it, and detect the loss of electric charge at the time of contact to determine where the contact is made. This method is relatively expensive and is called capacitive.

A more dense sensor can be installed around the screen to detect the location of the contact by detecting infrared blockage. This is not a direct method of applying pressure to the screen, so it is often used for products used in environments where the screen surface is susceptible to contamination.

 The touch screen panel is a transparent panel attached to the outside of the monitor and can be connected through the serial port or USB port, or a card installed inside the computer.

The touch screen panel sends the contact results to the controller. The controller processes the signals and sends the data to the processor.

The touch screen is divided into three main ways.

1.resistance

Resistive touch screen panels are electrically conductive, stacked in a thin layer of resistive metal, which keeps an eye out for contacts that cause a change in current and send them to the controller for processing. Resistive touch screen panels are generally more affordable, but only 75% transparent, and the disadvantage is that the coated layer can be damaged by sharp objects and the like. Resistive touch screen panels are not affected by external factors such as dust and water.

2. Surface Wave

Surface wave technology uses ultrasonic waves that pass over a touch screen panel. Some ultrasonic waves are absorbed when the panel is in contact. This change in the ultrasound records the contact location and sends this information to the controller for processing. Ultrasonic touch screen panels are the most advanced of the three, but have the disadvantage of being damaged by external elements.

3. Capacitive

Capacitive touch screen panels are coated with a material that stores charge. When the panel is in contact, a small amount of charge is attracted to the contact point. Circuits at each corner of the panel measure the charge and send this information to the controller for processing. Capacitive touch screen panels have the disadvantage that they must be touched by fingers, unlike resistive or surface wave panels that can use fingers or stylus. Capacitive touch screens are not affected by external factors and have high transparency.

The touch screen of the resistive, surface wave, and capacitive principles described above has a disadvantage of having a large error range and only a flat surface by converting a signal to a desired coordinate through an AD converter.

We want to make a pressure sensor module with no errors and precision and can be used on computer touch screen, robot skin, robot hand, etc.

The Y light path layer 2 and the Y light path layer 2 on which the Y light paths 11 connected to the XY light supply paths 12 are formed on the base film 1 having the two-dimensional surface, and again on the Y light path layer 2 An X light path layer 4 having a light path boundary layer 3 formed thereon and a plurality of X light paths 10 connected to the XY light supply path 12 formed on the X and Y light path boundary layers 3 are formed again. A touch surface made of a surface film 5 layer is formed on the X light path layer 4, and when the LED 6 illuminates the XY light supply path 12, the light is emitted to the X CCD 7 and the Y CCD 8. Transferring, the X CCD 7 and the Y CCD 8 are again connected to the MPU 9 to transmit a touched signal.

   If the operation principle is explained in detail, when the LED is applied to the touch screen configured as described above, the LED emits light and the emitted light passes through the XY light supply passage 12 and the multiple Y light passages 11 and the multiple X light passages. Light is transmitted to (10) and light is transmitted to X CCD (7) and Y CCD (8), which is then transmitted to the MPU (9), as in the touched part (15) of the partial magnification (13). When the force is received from the outside, the optical path of the portion to which the force is applied is narrowed so that all or part of the light is lost and transferred to the CCD element, which is then transferred to the MPU 9.

Here, the formation method of the X, Y optical paths (10, 11), etc.

A. Apply the photocurable liquid polymer to the transparent film transparent film (1).

  === X Light Path Layer Etching Process ===

B. Place the semi-finished product made in item A under the light path X-layer circuit film and irradiate light.

Place the semi-finished product made in item C.B and wash it, leaving only the hardened part.

   === X, Y light path separation layer process ===

The photocurable liquid polymer is applied again to the semifinished product made in D.C.

Place the semi-finished product made in E.D and cure it by irradiating with light.

  === Y light path layer etching process ===

The photocurable liquid polymer is applied again to the semifinished product made in item F.E.

G. Place an optical circuit film on the semi-finished product under Item F and irradiate light.

The semi-finished product made in item H.G is washed and only the hardened part is left. (Y light path layer completed)

The surface film (5) is coated on the semifinished product made in item I.H.

Connect with J.LED, CCD device and MPU circuit.

Briefly explaining the CCDd device function, there are two-dimensional CCDs used for digital cameras, and one-dimensional CCDs used for FAX. It is a sensor that recognizes the digital value by decomposing it with a constant resolution. If the resolution of the CCD device is assumed to be 8 bits, 255 is input at the maximum amount of light, 0 is input when the light is completely blocked, and light is pressed according to the pressure pressed when only part of the light is blocked. A part of the passage is blocked and the device receives 1-254.

The X CCD (7) and Y CCD (8) signals transmitted to the MPU 9 are calculated and processed based on the reference value set in the MPU to obtain the center position (X, Y) of the currently touched (CCD detected) section. The touched position value is transmitted to the upper device such as a computer through the interface (RS232, USB, BUS, I2C) attached to the MPU.

Instead of converting an analog signal to a DA, the digital signal is converted into a direct digital signal for each line of the optical path, so that the accuracy is high and even in a curved shape, it is expected to be used as a skin sensor such as a robot.

Claims (2)

Y-light path layer 2 and Y-light path layer in which a plurality of Y-light paths 11 are connected to the XY light supply path 12 on the base film 1 having a two-dimensional surface in the pressure sensor module having a two-dimensional structure (2) the X light path having the X, Y light path boundary layer 3 again formed on the X, Y light path boundary layer 3, and the plurality of X light paths 10 connected to the XY light supply path 12 again. The layer 4 is formed and the touch surface of the surface film 5 layer is formed on the X light path layer 4 again, and the XY light supply path 12 supplies the light through the LED 6 and the light path X. The light is transferred to the CCD (7) and the Y CCD (8), and the X CCD (7) and the Y CCD (8) are connected to the MPU (9) again to transmit the touched signal and the X CCD transferred to the MPU (9). (7), Y CCD (8) signal is calculated based on the reference value set in the MPU to obtain the center position (X, Y) of the currently touched (CCD detected) section, and attaches the touched position value to the MPU. Transfer to external device such as computer through interface (RS232, USB, BUS, I2C) A pressure sensor module with a light path of the structure. In the manufacturing method of the pressure sensor module through the optical path 1. Applying a photocurable liquid polymer to the transparent film (1) and 2. Place the semi-finished product made in item 1 on the light path X-layer circuit film below and irradiate light (can be irradiated using laser light without circuit film). Place the semi-finished product made in item 3.2 and wash it to leave only the hardened part. Applying the photocurable liquid polymer to the semifinished product made in Section 4.3; Placing the semi-finished product made in item 5.4 and curing it by irradiation with light; Applying the photocurable liquid polymer back to the semifinished product 7. Place the semi-finished product made from 6 items under the light path Y layer circuit film and irradiate light (can be irradiated with laser light without circuit film). Washing the semifinished product made in 8.7 leaving only the hardened part; Applying the surface film to the semifinished product made in item 9.8. 10. Manufacturing method of pressure sensor module through optical path produced by connecting with LED, CCD element and MPU circuit.

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