KR101536758B1 - Touch Pen For Touch Screen - Google Patents

Abstract

The present invention relates to a touch pen for a touch screen. The touch pen for a touch screen is used on a touch screen (10) of a light sensing camera (30) method of sensing a touch point of an object located on a screen (100) on which an image is implemented by sensing light for touch sensing projected from a luminous body and performing a corresponding command at the sensed touch point.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch pen for a touch screen,

The present invention relates to a method of sensing a touch point of an object positioned on a screen on which an image is displayed by sensing a projection light projected from a light emitting body and performing a command corresponding to the sensed touch point, BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch pen for a touch screen, and more particularly, to a touch pen for use with a touch screen, The present invention relates to a touch pen for a touch screen capable of preventing an error in measurement of touch position information caused by reflection phenomenon in the vicinity of a tip of a touch pen of a light and capable of transmitting the touch position information of an accurate touch pen by absorbing the external incident light will be.

The touch screen is a device that allows the user to grasp the touch point in response to the touch when a screen implemented on the screen is touched with a finger or a touch pen. The touch screen is conventionally formed by a structure overlaid on a flat panel display LCD panel or a PDP panel The touch screen senses the touch position of the finger separately from the displayed image on the screen and converts it into coordinates on the image screen, and the coordinate information is transmitted to the computer controlling the image. The computer synthesizes the image information and the position information received from the touch screen to control the image so as to take necessary correspondence.

Examples of practical application of touch screen include bank automatic teller machine, train ticket vending machine at train station, etc. It is widely used in mobile information equipment, portable telephone, etc. Nowadays, it is used in large screen that realizes large screen, System and so on.

Such a touch screen includes various methods such as an infrared matrix type, a thin film resistor type, a capacitive type, and a light sensing camera type for touch sensing.

In the camera system, a camera is installed at each corner of the touch screen, and a light background for touch sensing is installed on the edge of the touch screen frame facing the cameras, The camera captures the fact that the touch object blocks the background of the light for the touch sensing to determine the presence or absence of the touch and the position of the touch sensing object. The light sensing camera for touch sensing, which is a function of the touch screen, Since the light background part is located at the edge of the touch screen, there is no direct mechanical relation with the touch object.

The light sensing camera type touch screen for touch sensing is classified into a single touch screen capable of recognizing one touch object according to the number of recognizable objects and a multi touch screen capable of recognizing two or more touch objects touch screen. In order to recognize a single touch object, two cameras are basically required. In order to recognize two or more touch objects accurately at any position, three or more cameras are necessary. This is because, if there is another touch object in the horizontal angle (hereinafter referred to as "touch angle") of one touch object viewed from the camera, the touch angle can not be accurately recognized.

On the other hand, the optical sensing camera type touch screen for touch sensing can be divided into an LED background camera type and a reflection type camera type according to a method of illuminating a touch sensing light and forming a background, The camera system is a system in which LEDs, which are light emitting bodies, are installed in a light background part for touch sensing. The light emitting LEDs should be installed closely so that the light background for touch sensing is not cut off when the camera is viewed. Therefore, the larger the size of the touch screen, the larger the number of LED luminaires required, and the electronic circuit board and the associated electronic parts for mounting the LEDs are required, resulting in high production costs and difficult maintenance.

1, the light emitting unit 110 is installed together with the camera 120 to receive the reflected light, and the light background unit 130 for the touch sensing is provided with a reflecting surface 131 And the backlight unit 130 is configured to reflect the illuminated light toward the illuminating device. In comparison with the LED backlight type camera, the touch screen background unit 130 does not need any electronic components Because it is composed only of mechanical parts and optical parts which have a reflection function, it is simple in structure, and has a merit of low material cost and easy production.

The photo sensing camera type touch screen for touch sensing captures the fact that a touch object blocks a light background for touch sensing on a touch screen having a light for touch sensing, When a strong external light such as sunlight is incident on the touch screen and the touch pen moving on the touch screen due to an environmental factor of a place where the touch screen is installed, A reflection phenomenon occurs due to the external incident light in a portion in proximity to the tip of the touch pen which is in contact with the surface of the touch screen, so that the light sensing camera for touch sensing can not accurately detect the touch position of the touch pen, To solve this problem, a curtain or a barrier is used on the touch screen It had the inconvenience that must block the sunlight or external light incident to.

Registered Patent No. 10-1472741 (entitled " Touch Pen for Virtual Touch Failure in Infrared Touch Screen Device ")

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a touch sensing type touch sensor, It is possible to prevent the reflection of external incident light from occurring and thereby to prevent the occurrence of the error of the touch position measurement due to the reflection phenomenon of external incident light and to prevent the occurrence of the touch position measurement error even in the installation environment of the touch screen, So that it is possible to accurately detect the touch position of the pen tip. In addition, when the pen tip is repeatedly used for a long time, the pen tip can be replaced only when the pen tip is damaged.

In order to solve the above problems, in an aspect of the present invention, a camera 30 senses light for touch sensing projected from an illuminant, detects a touch point of an object located on a screen 10 on which an image is implemented And a touch sensing touch sensing unit for sensing a touch point of the touch sensing screen, the touch sensing unit comprising: a housing coupling hole (41) formed at one end of the housing; A body portion 40 provided with a body portion 40; A light absorbing portion 60 is provided at a predetermined length on one side of the outer circumferential surface and is detachably attached to the housing coupling hole 41 of the body portion 40 on the other side, A tip housing 50 in which a housing engaging projection 52 is formed; And a tip engaging protrusion 72 is formed on the other side of the tip housing 50 so as to be detachably attached to the tip engaging hole 51 of the tip housing 50. [ And a tip (70). The touch pen (1) for a touch screen according to claim 1,

In the touch pen 1 for a touch screen according to an embodiment of the present invention, the light absorbing portion 60 of the tip housing 50 is formed in a predetermined shape and depth on the outer circumferential surface of one side of the tip housing 50 A plurality of fine grooves 61 may be arranged at predetermined intervals,

The light absorbing portion 60 of the tip housing 50 is formed such that a black ink layer 62 is formed on the outer circumferential surface of one side of the tip housing 50 so that a black ink layer 63 is formed, A transparent protective film layer 64 of a predetermined thickness may be formed on the upper surface of the ink layer 63. [

The touch pen for a touch screen according to the present invention is characterized in that when strong external light such as sunlight is incident during use of an electronic whiteboard of a photo sensing camera type for touch sensing, It is possible to prevent the occurrence of the error of the touch position measurement due to the reflection phenomenon of the external incident light,

Further, in a setting environment of a touch screen in which strong external light such as sunlight is incident, a touch position of the touch pen can be accurately detected even when external incident light is not blocked by using a curtain or a shielding film,

It is easy to maintain and economical because it is possible to replace only the damaged pen tip when the pen tip is worn and damaged by repeatedly using the touch pen for a long time.

1 is a schematic view showing a touch screen of a conventional photo-sensing camera type for reflective touch sensing;
2 is a conceptual diagram illustrating a method of detecting a position of a touch object in a touch screen of a photo-sensing camera type for touch sensing;
3 is an exploded perspective view illustrating a touch pen for a touch screen according to the present invention;
4 is an exploded perspective view showing another embodiment of a touch pen for a touch screen according to the present invention;
5A and 5B are a front view and a cross-sectional view, respectively, showing a touch pen for a touch screen according to the present invention, in which the light absorbing portion is composed of a plurality of fine grooves formed on the surface of the upper portion of the pen tip;
FIG. 6A is a front view and a cross-sectional view illustrating a touch pen for a touch screen according to the present invention, in which the light absorbing portion is formed of a black ink layer and a transparent protective film layer, respectively, And
6B is a front view and a cross-sectional view illustrating another embodiment of the light absorbing portion of the touch pen for a touch screen according to the present invention.

Hereinafter, embodiments of the present invention in which the above object can be specifically realized will be described with reference to the accompanying drawings. In describing the embodiments, the same names are denoted by the same reference numerals, and further description thereof will be omitted below.

FIG. 2 is a conceptual view showing a method of detecting the position of a touch object on a touch screen 10 of a photo-sensing camera 30 for touch sensing. FIG. 3 is a view showing a touch pen 1 for a touch screen according to the present invention. 4 is an exploded perspective view showing another embodiment of the touch pen 1 for a touch screen according to the present invention.

5A and 5B are perspective views illustrating a touch pen for a touch screen according to an embodiment of the present invention. Referring to FIGS. 5A and 5B, a light absorbing portion 60 includes a plurality of fine grooves 61 formed on a surface of the pen tip 70, 6A is a front view and a sectional view showing that the light absorbing portion 60 is formed on the surface of the upper portion of the pen tip 70 in the touch pen 1 for a touch screen according to the present invention A black ink layer 63 and a transparent protective film layer 64. Figure 6B is a sectional view showing the configuration of the light absorbing portion 60 in the touch pen 1 for a touch screen according to the present invention. Fig. 2 is a front view and a cross-sectional view showing another embodiment of the present invention.

A method for measuring the position of a touch object on a touch screen 10 of a photo sensing camera 30 for touch sensing is as follows. As shown in FIG. 2, the four sides of a screen 10, A light sensing camera 30 for touch sensing is provided at both corners of the upper side of the screen, and a viewing angle of 90 degrees is provided so as to monitor the entire area of the screen 10 at the installation position. All the images entering the viewing angle of the annoyance camera 30 are projected as one straight line segment to the sensor provided in the camera 30. The image projected by the straight line segment is projected in a 90 degree viewing angle The position of the video image is calculated by the angle of the camera 30 by determining which angle corresponds to the position.

That is, as shown in FIG. 2, the position of the camera A installed on the right edge of the light sensing camera 30 for touch sensing installed on the upper side edges of the screen 10 on which the screen is implemented is referred to as reference coordinates 0 (0, 0), the horizontal length of the screen 10 is set to L, and the length of the screen 10 in the vertical direction is set to H, the image on the screen of the point touched by the user's finger, y are recognized by the two cameras A and B as shown in the following equations (1) and (2).

&Quot; (1) "

tan a = y / (Lx)

&Quot; (2) "

tan b = x / y

&Quot; (3) "

x = (L x tan a x tan b) / (tan a tan b + 1)

y = (L x tan a) / (tan a tan b + 1)

The control board calculates the touch coordinates of the user sensed by the camera 30 through the equations (1), (2) and (3), and transmits the coordinate to the computer. The computer transmits the touch coordinates transmitted through the control board to the screen The touch screen 10 is displayed on the screen 10 in correspondence with the image to be implemented. According to the environment in which the touch screen 10 is installed during the use of the touch pen 10 on the conventional touch screen 10, The camera 30 can not recognize the touch object due to the reflection phenomenon due to strong sunlight and the light blurring phenomenon generated in the vicinity of the pen tip and an error occurs during the measurement of the position of the touch pen.

3, the touch pen 1 for a touch screen according to the present invention includes a light absorbing portion 60 on a lower outer circumferential surface of a tip housing 50 provided at an upper portion of a pen tip 70, Absorbs external light incident on the vicinity of the pen tip 70 in the light absorbing portion 60 when excessive external light such as sunlight is incident near the tip 71 of the touch pen 1 It is possible to prevent the occurrence of the error of the touch position measurement due to the reflection phenomenon of the external incident light and to allow the photo sensing camera 30 for the touch sensing to accurately measure the touch position of the touch pen 1. [

3, the touch pen 1 for a touch screen according to the present invention includes a main body 40 of the touch pen 1, a tip 40 which is detachably attached to the tip of the main body 40, A housing 50, and a pen tip 70 detachably attached to the tip housing 50.

The body portion 40 is formed in a long bar shape so that the user can easily touch the touch pen 1 and touch the touch pen 10 and has a hollow inner housing coupling hole 41 at one end .

As shown in FIG. 3, the tip housing 50 is provided with an inner hollow tip fitting hole 51 at one end thereof, a light absorbing portion 60 at a predetermined length on one outer circumferential surface thereof, A housing coupling protrusion 52 detachably coupled to the housing coupling hole 41 of the body portion 40 is provided. A tip engaging protrusion 72 provided on the other side of the pen tip 70 is detachably engaged with the tip hollow hole 51 of the inner hollow and a tip 71 is provided on one side of the pen tip 70 And touches the surface of the touch screen 10.

3, the housing coupling hole 41 of the body portion 40 and the tip coupling hole 51 of the tip housing 50 are respectively inserted into the housing of the tip housing 50, The engaging projections 52 and the tip engaging protrusions 72 of the pen tip 70 can be detachably engaged and detachably coupled. 4, female threads are formed on the inner circumferential surfaces of the housing coupling holes 41 of the body portion 40 and the tip fitting holes 51 of the tip housing 50, respectively, And a male thread is formed on the housing coupling protrusion 52 of the tip housing 50 and the tip coupling protrusion 72 of the pen tip 70 to form the housing coupling hole 41 and the tip coupling hole 51, and when the pen tip 70 is worn and damaged by repeatedly using the touch pen 1 for a long time, only the damaged pen tip 70 can be used for replacement, And the cost of replacing the touch pen 1 can be reduced.

2, the touch pen 1 for a touch screen according to the present invention includes a plurality of fine grooves 61 arranged at predetermined intervals in the longitudinal direction on the outer circumferential surface of the lower portion of the tip housing 50 The light absorbing portion 60 is formed in the fine grooves 61. The external light incident between the plurality of fine grooves 61 causes irregular reflection in the fine grooves 61 to stay in the fine grooves 61, Only a small amount of external light that can not be sensed by the photo sensing camera 30 for touch sensing is refluxed and diffused from the inside of the fine grooves 61 to the outside so that the light sensing for photo sensing The occurrence of the touch object recognition error phenomenon of the camera 30 can be prevented. The shape of the fine grooves 61 is not limited to the shape of the fine grooves 61 as long as the outer light incident on the fine grooves 61 can be irregularly diffused in the grooves, 61) can also be formed.

6A, in the touch pen 1 according to the present invention, the light absorbing portion 60 may be formed as a black ink on the outer peripheral surface of the lower portion of the tip housing 50, A transparent protective layer 64 is applied on the upper surface of the black ink layer 63 formed of the black ink 62 coated with the predetermined thickness to form the pen tip 70, External light incident to the vicinity of the transparent protective layer 64 can be prevented from being absorbed by the black ink layer 63 and reflected to the outside. The light absorbing portion 60 may be formed only of the black ink layer 63 by applying the black ink 62. However, in the process of repeatedly using the touch pen 1 for a long period of time, A transparent protective layer 64 is formed on the upper surface of the black ink layer 63 to prevent the black ink layer 63 from abrading or abrading. The black ink layer 63 and the transparent protective film layer 64 may be formed by applying a black ink 62 or a transparent enamel paint or the like. However, a black film and a transparent film may be laminated on the lower outer circumferential surface of the tip housing 50 4, a separate ring member having the light absorbing portion 60 formed on its surface may be engaged with the outer circumferential surface of the lower portion of the tip housing 50, as shown in FIG.

6B, the black micro beads 66 and the solvent are mixed with the ultraviolet curable resin 65 of the transparent acrylic type, and the mixture is applied to the outer peripheral surface of the bottom of the tip housing 50 to a predetermined thickness, The light absorbing portion 60 may be formed by mixing the ultraviolet curing resin 65 and the black micro beads 66 with the solvent to form the light absorbing portion 60, It is possible to prevent the wear and tear of the light absorbing portion 60 due to repeated use of the touch pen 1 for a long time without forming the layer 64. [

The touch pen 1 for a touch screen according to the present invention configured as described above is configured such that when strong external light such as sunlight is incident during use of the electronic whiteboard of the photo sensing camera 30 for touch sensing, 1 can be prevented or minimized by the reflection of external incident light in the vicinity of the tip 71 of the light sensing camera 30 for preventing the occurrence of a touch object recognition error of the light sensing camera 30 for touch sensing due to the reflection phenomenon of external incident light,

Further, in a setting environment of the touch screen 10 on which strong external light such as sunlight is incident, it is possible to accurately detect the touch position of the touch pen 1 even when external incident light is not blocked by using a curtain or a shielding film When the pen tip 70 is worn and damaged by repeatedly using the touch pen 1 for a long period of time, only the damaged pen tip 70 can be easily replaced.

It is to be understood by those skilled in the art that the present invention may be embodied in many other forms without departing from the spirit and scope of the invention,

Accordingly, the above-described embodiments are to be considered illustrative and not restrictive, and all embodiments within the scope of the appended claims and their equivalents are intended to be included within the scope of the present invention.

1: Touch pen for touch screen
10: touch screen 30: photo sensing camera for touch sensing
40: body part 41: housing coupling hole
50: Tip housing 51: Tip fitting hole
52: housing coupling projection 60: light absorbing part
61: fine groove 62: black ink
63: black ink layer 64: transparent protective film layer
65: transparent acrylic ultraviolet ray hardening resin 66: black microbead
70: Pen tip 71: Tip
72: tip coupling projection

Claims (3)

The camera 30 senses light for touch sensing projected from a light emitting body to sense a touch point of an object positioned on the screen 10 on which an image is implemented, and performs a touch sensing operation A touch pen for a touch screen used in a touch screen (10) of a light sensing camera (30)
A body portion 40 having an inner hollow housing coupling hole 41 at one end thereof;
A light absorbing portion 60 is provided at a predetermined length on one side of the outer circumferential surface and is detachably attached to the housing coupling hole 41 of the body portion 40 on the other side, A tip housing 50 in which a housing engaging projection 52 is formed; And
One end of the tip end of the tip housing 50 is provided with a tip 71 to be touched by touching the surface of the touch screen 10 and a tip tip protrusion 72 to be detachably attached to the tip end fitting hole 51 of the tip housing 50 (70) formed on the outer surface of the touch panel.
The method according to claim 1,
The light absorbing portion (60) of the tip housing (50)
And a plurality of fine grooves (61) formed in a predetermined shape and depth on an outer circumferential surface of one side of the tip housing (50) are arranged at predetermined intervals.
The method according to claim 1,
The light absorbing portion (60) of the tip housing (50)
A black ink layer 62 is formed on the outer circumferential surface of one side of the tip housing 50 so as to have a predetermined thickness to form a black ink layer 63. A transparent protective film layer 64 having a predetermined thickness is formed on the upper surface of the black ink layer 63 ) Is formed on the surface of the touch panel (1).

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