KR20060017464A - Ultra thin optical joystick and personal portable device having an ultra thin optical joystick - Google Patents

Abstract

The optical joystick may include a first waveguide and a first planar lens including a first reflecting surface positioned below a reading area for sensing a movement of a subject, and a first planar convex lens for collecting light reflected from the first reflecting surface. A second waveguide including a second flat convex lens portion facing the portion and a second reflective surface for reflecting light incident from the second flat convex lens portion, and an image sensor positioned below the second reflective surface. do. The first reflective surface and the first flat convex lens portion are integrally formed in the first waveguide, and the second flat convex lens portion and the second reflective surface are integrally formed in the second waveguide. By integrally forming the reflecting surface and the lens portion, the thickness of the optical joystick can be significantly reduced, and by arranging the first and second waveguides facing each other, the refractive and condensation can be efficiently improved.

Mobile Phone, Optical Joystick, Image Sensor, Waveguide, Slim, Lens

Description

ULTRA THIN OPTICAL JOYSTICK AND PERSONAL PORTABLE DEVICE HAVING AN ULTRA THIN OPTICAL JOYSTICK}

1 to 3 are cross-sectional views illustrating a pointing principle of a conventional optical mouse.

4 and 5 are schematic views for explaining the relationship between the height and the depth of focus of the image input device.

6 to 8 are cross-sectional views of an optical joystick according to an exemplary embodiment of the present invention.

9 to 11 are cross-sectional views illustrating an optical joystick according to an exemplary embodiment of the present invention.

FIG. 12 is a plan view illustrating the structures of the first waveguide and the second waveguide shown in FIGS. 6 and 9.

13 is a cross-sectional view for describing an optical joystick according to an exemplary embodiment of the present invention.

FIG. 14 is a side view illustrating the waveguide of the optical joystick of FIG. 13.

FIG. 15 is a perspective view illustrating a waveguide of the optical joystick of FIG. 13.

FIG. 16 is a partial perspective view illustrating the light joystick of FIG. 13.

17 is a perspective view illustrating the optical joystick of FIG. 13.

FIG. 18 is a plan view illustrating the light joystick of FIG. 13. FIG.

FIG. 19 is a side view illustrating the light joystick of FIG. 13. FIG.

20 is a perspective view illustrating a personal portable terminal according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input device, and more particularly, to a personal handheld terminal including an ultra-slim optical joystick and an ultra-slim optical joystick that can be easily mounted on a personal portable terminal such as a mobile phone.

In the related art, an input module using a keypad is mainly used in a personal portable device such as a mobile phone. Specifically, the conventional personal handheld terminal includes a plurality of buttons for inputting numbers and letters, and can input a designed telephone number or sentence through input of buttons defined in each button.

In addition, the conventional personal portable terminal can provide a variety of functions using the menu key and other function keys. Recently, by being able to express graphics and the like on the display unit of a personal portable terminal, it becomes possible to use the display unit in two dimensions, and at this time, to set and operate a desired function by using a menu key and other function keys as direction keys. It became.

Even though the function of the personal mobile terminal changes similar to a personal computer (PC), a personal mobile terminal such as a mobile phone still uses a direction key, and the user selects an input method to move one step at a time when the direction key is pressed. have. Although the input method using the direction keys is inconvenient, the reason why the input method using the keypad is mainly used is that the input method using the keypad is so familiar to date, and other input methods disclosed so far can make the input module thin. Because there is not. For example, the mobile phone essentially includes a printed circuit board (PCB) and a radio frequency (RF) module. Since the location and thickness of these essential parts in mobile phones is considerable, there is no space available for parts other than these critical parts.

In summary, the conventional input method using a keypad can implement only a mono movement that can move only one space when entering a phone number or using a menu. As a result, this single movement method can slow down the input of numbers or letters, and it can be cumbersome because most of the keys are almost memorized. In addition, there is a limitation that cannot be used in a GUI (Graphic User Interface) environment, such as a computer window (Windows) that is currently in progress in a single mobile system.

Currently, a number of pointing devices that support a GUI environment in a computer are disclosed, and the pointing devices may be a ball mouse, an optical mouse, a laser mouse, or a touch, depending on how they operate. Touch pads, tablets, and the like.

The pointing device used in a computer can theoretically be used as a pointing device of a personal mobile terminal. However, since the personal handheld terminal is intended to be portable, a separate pointing device separated from the main body is practically limited to being used as a pointing device of the personal handheld terminal.

A trackball-type or joystick-type mouse may be proposed as a pointing device that can be integrally mounted to a personal portable terminal. However, the trackball or joystick structure physically occupies a predetermined space or more, and the structure may hinder the slimming of the personal mobile terminal.

In view of the above problems, the pointing principle used in the optical mouse among the above-mentioned pointing devices can be applied to the personal portable terminal.

1 to 3 are cross-sectional views for explaining a pointing principle of a conventional optical mouse.

Referring to FIG. 1, the image input device 21 used in the conventional optical mouse includes a cover glass 41, a lens 42, a blocking film 44, and an image sensor 46. In addition, as a light source, a high-brightness light-emitting diode (LED) 43 is used, and light emitted from the light-emitting diode 43 may be supplied to the cover glass 41 through the light source guide 46. .

In the conventional optical mouse, light is irradiated from the light source toward the bottom surface, and an image sensor is positioned above the lens to detect the movement of the optical mouse. However, in order to apply the conventional optical mouse structure to the personal portable terminal, the finger, that is, the subject moves on the cover glass 41, and the image sensor 46 may change the sensing motion of the relatively moving subject.

According to this, in the conventional optical mouse structure, the cover glass 41, the lens 42, and the image sensor 46 are arranged in series up and down. That is, the bottom is the image sensor 46, the top is the cover glass 41 for projecting one surface of the subject, the lens 42 is located under the cover glass 41. A blocking film 44 may be disposed between the lens 42 and the image sensor 46 to block ambient noise light, thereby forming a clearer image on the image sensor 46.

Referring to FIG. 2, light generated from the light emitting diodes 43 in the conventional optical mouse structure may be transmitted to the outside of the cover glass 41 through the light source guide 45 (47).

The propagation path of the transmitted light may be reflected downward by raising a subject such as a finger on the cover glass 41, and the reflected light may be formed in the image sensor 46.

Referring to FIG. 3, the light reflected by the subject is transmitted to the lens 42, the blocking film 44, and the image sensor 46. The light emitted from the light source is reflected by the finger 48 on the cover glass 41 to change the light path, and the light path thus changed is focused on the optical image sensor 46 by the lower lens 42. do. The image sensor 46 may detect a change in the focused image and convert it into an electrical signal, and a main body such as a personal portable terminal may interpret the movement of the subject from the electrical signal generated from the image sensor 46.

However, the image input device 21 having such a structure cannot completely solve the slimming of the personal mobile terminal. In view of the current technology level, the shortest height of the image input device 21 is limited to about 4 to 5 mm in the conventional optical mouse structure, whereas a recent personal portable terminal seeking ultra slim requires a module height of about 2 mm or less. Because it is.

The reason why the height of the image input device 21 cannot be reduced to 2 mm or less in the conventional optical mouse structure is that it is difficult to manufacture the ultra-precision structure, but it can be said that there is a constant relationship with the depth of focus.

4 and 5 are schematic views for explaining the relationship between the height and the depth of focus of the image input device.

Referring to FIG. 4, an optical system having a short focal length is illustrated. When light 62 is irradiated onto the lens 61, the image sensor surface 63 is focused. However, when the focal length is short, the angle incident on the image sensor surface 63 is large, so that the focal spot of the light becomes large even if the focal length is slightly twisted up and down during assembly. If the spot becomes too large, the spot size becomes larger than the pixel size of the image sensor. This causes the occurrence of defects due to the occurrence of assembly tolerances and the like.

In contrast, FIG. 5 shows an optical system with a long focal length. When light 65 is irradiated onto the condenser lens 64, this also causes focusing on the image sensor surface 66. Since the focal length between the condenser lens 64 and the image sensor surface 66 is sufficiently long, the angle of the light 65 incident on the image sensor surface 66 becomes small. In this case, even if the image sensor surface 66 is turned up and down, a small focal spot will not occur, thereby causing a defect. This is because the spot size does not become larger than the pixel size of the image sensor even if the tolerance is to some extent.

In summary, in the conventional optical mouse structure, the cover glass, the lens, and the image sensor are aligned in the optical axis direction, and the height of the basic device is limited due to the limitation of the depth of focus of the optical system.

The present invention is to overcome the above-mentioned problems, one object of the present invention is to input a number or a character in a personal portable terminal without an input device such as a mouse, a GUI (Graphic User Interface) such as a computer (Windows) It is to provide an optical joystick and a personal portable terminal that can implement an environment such as).

It is another object of the present invention to move a pointer on the screen by moving a finger that is a subject on the optical joystick, and furthermore, to provide an optical joystick and a personal portable terminal that can further reduce the height of the optical joystick and secure sufficient depth of focus. It is.

Another object of the present invention is to provide an optical joystick and a personal portable terminal that can be made thin and easy to mount and assemble.

According to an embodiment of the present invention, an optical joystick includes a first waveguide for refracting and condensing light projected from a subject, and a second waveguide for condensing and refracting light passing through the first waveguide. And an image sensor that receives light refracted from the second waveguide.

The first waveguide includes a first reflecting surface positioned below the reading area for sensing the movement of the subject, and a first planoconvex section for collecting light reflected from the first reflecting surface. The second waveguide facing the first waveguide may further include a second half for reflecting light incident from the second planoconvex section facing the first planar lens portion and the second planar lens portion. Includes slopes. Light emitted from the light source to the subject is reflected by the subject. Light reflected from the subject is refracted by the first reflective surface, and light refracted by the first reflective surface is focused while passing through the first and second planar convex lenses. Then, the light passing through the first and second flat convex lenses may be refracted by the second reflecting surface to be imaged on the image sensor.

Therefore, the light reflected from the subject can be deflected twice to secure a sufficient depth of focus, and the height of the optical joystick can be reduced to about 2 mm or less since the first waveguide and the second waveguide include a reflecting surface and a lens portion. In addition, since the reflective surface and the lens portion are integrally formed, the waveguide can be easily manufactured, and the assembly process is simple, which is very advantageous for mass production.

According to one embodiment of the invention, the optical joystick is a first waveguide for refracting and condensing the light projected from the subject, the second waveguide for condensing the light passing through the first waveguide and the light passing through the second waveguide. It includes an image sensor for receiving.

As in the previous embodiment, the first waveguide includes a first reflecting surface positioned below the reading area for sensing the movement of the subject and a first planar convex lens for collecting light reflected from the first reflecting surface. However, the second waveguide may also include the second flat convex lens portion facing the first waveguide, facing only the first flat convex lens portion, and include an exit surface without the second reflective surface. Even with one refraction by the first reflecting surface, sufficient depth of focus can be secured, and the second waveguide can be kept simpler in structure. Of course, since the first waveguide and the second waveguide are used, the height of the optical joystick can be reduced to about 2 mm or less, and since the reflective surface or the lens portion is integrally formed, the waveguide can be easily manufactured and the assembly process is simple. It is very advantageous for mass production.

By moving a subject such as a finger on the reading area, a specific number or letter can be specified, and a desired setting or function can be activated by selecting an icon. Several methods can be discussed in making selections in the optical joystick, but the input can be made by directly hitting a finger in the reading area, or can be input using a separate button.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. Therefore, the protection scope of the present invention is not limited or limited by the following examples.

6 to 8 are cross-sectional views of an optical joystick according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the optical joystick 100 includes a first waveguide 110, a second waveguide 120, an image sensor 150, a cover glass 130, and a light source unit 140.

The light source unit 140 includes a light emitting LED 142 and a reflection mirror 144. Since the image sensor 150 that enters the optical joystick 100 has a pixel size of 30 μm and a pixel size of 50 μm or more, the image sensor 150 does not need to be irradiated with the light source from the light source unit 140 in the form of a waveguide. The intensity of the light source incident on the sensor may be sufficient. In addition, since the application of the present invention is a module applied to a mobile device such as a mobile phone, the section where the pointer moves is substantially smaller than that of a general computer, and the light source unit 140 can be formed more simply because the section of the pointer moves smaller.

Referring to FIG. 7, light emitted from the LED 142, which is a light source, is reflected by the reflection mirror 144 and is incident low to the bottom surface of the cover glass 130. The reason why the low angle of light is incident on the bottom surface of the cover glass 130 is to make it possible to easily scan information on the surface shape of the finger placed on the object surface. Alternatively, light may be directly irradiated from the LED 142 to the cover glass 130 without a separate waveguide or a reflection mirror.

When there is no object on the upper surface of the cover glass 130, the light emitted from the light source is transmitted to the upper surface of the cover glass 130 as it is, and no information may be transmitted to the optical image sensor 150.

Referring to FIG. 8, when there is an object such as a finger F on the cover glass 130, the irradiated light is reflected and incident to the first waveguide 110 positioned at the lower end thereof, and then to the first waveguide 110. The light is reflected by the first reflection surface 112 in the left and right parallel directions.

The optical path changed in the parallel direction travels along the first waveguide 110 and is collected while passing through the first flat convex lens 114 formed at the end of the first waveguide 110. Such light is incident on the second waveguide 120 through a blocking unit 160 that may block ambient noise light.

The second waveguide 120 includes a second flat convex lens portion 124 and a second reflective surface 122, and the second flat convex lens portion 124 and the second reflective surface 122 are made of optical plastic. It is formed integrally by using. Light incident on the second waveguide 120 is collected while passing through the second flat convex lens unit 124, and is reflected downward by the second reflecting surface 122. As the light is reflected from the second reflecting surface 122, the light path is changed again in the vertical direction.

In this case, the first or second flat convex lenses 114 and 124 may be formed in various shapes as condensing lenses, and may be formed in spherical lenses or aspherical lens shapes. In addition, another condensing lens or another waveguide may be interposed between the first waveguide 110 and the second waveguide 120, which may be variously changed within the scope of the present invention according to the intention of the designer. will be.

In addition, the first and second waveguides 110 and 120 may be symmetrical with each other or may be asymmetrical with each other. In the case of asymmetry, the first and second waveguides 110 and 120 may vary the curvature of the lens, the shape of the lens surface such as spherical and aspherical surfaces, the length of the lens, and the thickness of the lens.

Referring to the drawings again, the light path is changed is incident to the optical image sensor 150 placed on the PCB (Printed Circuit Board) is incident and imaged. The coordinates are calculated by calculating the change of the captured image, and the pointing device of the optical joystick for moving the pointer on the display including the LCD may be implemented.

The cover glass 130, the first and second flat convex lens portions 114 and 124 and the image sensor 150 are not arranged vertically in the optical axis direction, but the arrangement is changed in the left-right parallel direction. This is because it is applied to mobile devices such as mobile phones. In general, since the thickness of the device is very thin, the vertical configuration of each component has a limitation in reducing the thickness due to the limitation of the focal length. For reference, the vertically configured module is difficult to reduce the thickness to less than 4mm even if the maximum thickness.

In addition, if the optical system of the light collecting part is designed to reduce the thickness excessively, the depth of focus becomes very thin, and there is a risk that the quality of light focused on the image sensor may be degraded due to the tolerance of the mechanical part such as the barrel.

Therefore, if the optical path is changed in the horizontal direction as in the present invention, the module can be made ultra-slim with a thickness of about 2.0 mm or less, which can be mounted on a mobile device such as a mobile phone, while having a sufficient focal length of about 5 to 30 mm. The depth of focus can be deepened, resulting in excellent workability and mass production.

9 to 11 are cross-sectional views illustrating an optical joystick according to an exemplary embodiment of the present invention.

9 to 11, in the structure of FIG. 6, the LED 142 is placed in an upper direction and the reflective mirror 144 is tilted to make light propagate to the cover glass 130. This makes it easy to change the angle and direction of the light incident on the cover glass 130 is easy to design at an angle suitable for the initial setting of the module.

10 and 11 except for the light source unit 140 have the same configuration and function as the corresponding component of the previous embodiment. Therefore, for the same configuration in the description of the present embodiment, reference may be made to the description and drawings of the previous embodiment, and repeated content may be omitted.

FIG. 12 is a plan view illustrating the structures of the first waveguide and the second waveguide shown in FIGS. 6 and 9.

Referring to FIG. 12, the thicknesses of the first and second waveguides 110 and 120 may not exceed about 2.0 mm in order to be applied to a mobile device such as a mobile phone, but the width of the first and second waveguides 110 and 120 may have a space depending on the structure in which they are mounted. Therefore, even if the position of the light source unit 140 is located at any portion below the cover glass 130, the light source 140 may enter the cover glass at a low angle, and may transmit sufficient information to the image sensor 150.

As described above, the present invention uses the optical waveguide reflecting surface and the condenser lens to limit the thickness of the cover glass, the lens, and the optical image sensor, which are problems of the conventional mouse sensor module. The present invention relates to an optical joystick pointing input device capable of slimming a module while realizing a sufficient focal length and depth of focus by changing the horizontal direction. In particular, the ultra-slim optical joystick pointing input device has an advantage that it can be applied to small and ultra-thin devices that are characteristic of mobile devices such as mobile phones.

13 is a cross-sectional view illustrating an optical joystick according to an exemplary embodiment of the present invention, and FIG. 14 is a side view illustrating the waveguide of the optical joystick of FIG. 13. FIG. 15 is a perspective view illustrating a waveguide of the optical joystick of FIG. 13, and FIG. 16 is a partial perspective view illustrating the optical joystick of FIG. 13.

13 to 16, the optical joystick 200 includes a cover glass 230, a first waveguide 210, a second waveguide 220, an image sensor 250, and a light source unit 240. The first waveguide 210 is integrally formed of an optical plastic material and includes a first reflective surface 212 and a first planar lens 214. The second waveguide 220 is also integrally formed of an optical plastic material, and includes a second reflective surface 222 and a second flat convex lens unit 224. When the light is irradiated to the subject from the light source unit 140, after the light is reflected from the subject, the cover glass 230, the first reflecting surface 212, the first flat convex lens unit 214, the blocking unit 260, and the first The second convex lens unit 224, the second reflecting surface 222, and the image sensor 250 are transferred to the image sensor 250.

In the vertical structure connected to the first and second flat convex lens parts 214 and 224 and the image sensor 250 in the cover glass 230, the traveling path of the light may be modified once or twice in a horizontal structure. Can be. As a result, it is possible to secure a sufficient focal length and depth of focus and to configure a module having a thickness of 2.0 mm or less.

In particular, the most important factor when mounting on a small portable device such as a mobile phone is the thickness of the optical joystick, and by varying the optical path in the longitudinal direction (horizontal direction), the module length is 5-30 mm depending on the type of small portable device such as each mobile phone. It can be applied to any model by deforming.

As shown in FIG. 16, the image sensor 250 is mounted on the PCB 252 and is designed to exactly match the center of the image sensor 250 and the center of the lens unit.

FIG. 17 is a perspective view illustrating the optical joystick of FIG. 13, FIG. 18 is a plan view illustrating the optical joystick of FIG. 13, and FIG. 19 is a side view illustrating the optical joystick of FIG. 13.

17 to 19, the optical system, the blocking unit 260, the barrel 272, the housing 274 for fixing the PCB 252, the click button 232, and the dome for transforming the click into an electrical signal. The switch 234 is configured. When a finger (subject) is placed on the upper surface of the cover glass 230 and the light is irradiated from the lower side to the cover glass 230 with the LED, the fingerprint of the finger may be recognized to recognize the intensity of light. At this time, the light and shade of the fingerprint can be recognized by recognizing the valleys and the floor of the fingerprint.

Light reflected from the subject is incident on the image sensor 150 via the first and second waveguides 210 and 220. The information of the incident light is analyzed by the image sensor 250 and converted into an electrical signal in a circuit, and the pointer may be moved on a screen (not shown) including an LCD according to the converted signal.

The present invention relates to an optical joystick that can be applied to both small portable devices such as mobile phones (PDA, notebook, HPC, etc.).

In the present patent, letters and numbers are given as examples, but numbers are also collectively referred to as letters.

The above light joystick can also be used for scrolling.

Scrolling is to move the pointer up and down or left and right, so that you can scroll in the desired direction only by moving your finger without pressing a button. In particular, you can adjust the scrolling direction and speed according to the moving speed, direction, and distance of the finger.

20 is a perspective view illustrating a personal portable terminal according to an embodiment of the present invention.

Referring to FIG. 20, the personal portable terminal 300 includes a main body 310 and an optical joystick 200. Here, the terminal body 310 includes internal and external components and circuit configurations including general terminal functions. The terminal body 310 may include a terminal case, a keypad, a display module, a wireless transmission / reception module, a battery, a microphone, a receiver, and the like. The shape of the terminal body 310 may also be a flip type, a folding type, a slide type, a swing type, or the like. Likewise, it can be formed in various kinds of styles.

In the present specification, a personal portable device (Personal Portable Device) refers to a portable electric and electronic device such as a PDA (Personal Digital Assistant), a smart phone, a handheld PC, a mobile phone, an MP3 player, and the like. A predetermined communication module such as a Division Multiplexing Access module, a Bluetooth module, an infrared communication module (IrDA), a wired / wireless LAN card, etc., and a terminal having a predetermined computing power by mounting a predetermined microprocessor for performing a multimedia playback function Can be used as a generic concept.

As shown in FIG. 20, the cellular phone main body 310 includes a main part and a folder part, and a keypad, a battery, a communication circuit, and the like are mounted on the main part. The folder part is also equipped with a display including an LCD. The upper part of the keypad is equipped with a menu key for setting the function of the mobile phone, the optical joystick 200 is mounted on the front of the mobile phone main body 310 so that the cover glass 230 is exposed in the center of the menu key.

Since the click button 232 is mounted to the periphery of the cover glass 230 in the optical joystick 200, the user can move the pointer displayed on the display using the optical joystick 200, and the peripheral click button ( Various functions can be implemented using 232).

As described above, according to the character input method of the pointer movement optical joystick according to the present invention, input is possible only by the movement of a finger without a keyboard input, and the finger enters through the pointer movement optical joystick and the click button, and implements an emulator. It is possible to directly enter the letters through.

It is easy to input using this method, and it is possible to reduce the light weight of small portable devices such as mobile phones.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (21)

A first reflecting surface positioned below the reading area for sensing a movement of a subject and a first planar lens portion configured to collect light reflected from the first reflecting surface, wherein the first reflecting surface and the first planar convex A first waveguide formed integrally with the lens portion; And a second reflecting surface for reflecting light incident from the second planar lens portion facing the first planar lens portion, and the second planar lens portion and the second planar lens portion. A second waveguide in which two reflecting surfaces are integrally formed; And And an image sensor positioned below the second reflecting surface. A first reflecting surface positioned below the reading area for sensing a movement of a subject and a first planar lens portion configured to collect light reflected from the first reflecting surface, wherein the first reflecting surface and the first planar convex A first waveguide formed integrally with the lens portion; And a second flat convex lens unit facing the first flat convex lens unit and an exit surface for passing light incident from the second flat convex lens unit, wherein the second flat convex lens unit and the exit surface A second waveguide integrally formed; And And an image sensor positioned adjacent to the exit surface. The method according to claim 1 or 2, The light joystick, characterized in that the first or second planar lens portion is formed in the shape of a general spherical lens or aspherical lens. The method according to claim 1 or 2, And another waveguide including a lens or a lens portion interposed between the first and second waveguides. The method according to claim 1 or 2, And the first and second waveguides are arranged to be symmetrical with each other. The method according to claim 1 or 2, And the first and second waveguides are arranged to be asymmetric with each other. The method according to claim 1 or 2, The light joystick, characterized in that the cover glass is formed integrally or separately on the first reflection surface of the first waveguide. The method of claim 7, wherein A light source unit is mounted adjacent to the cover glass, and the light source unit includes a light emitting module for emitting light to irradiate light directly or indirectly to the cover glass. The method of claim 8, The light source unit is positioned at a lower end of the first reflective surface of the first waveguide, and the light generated from the light emitting module passes through the first reflective surface of the first waveguide and irradiates toward the upper surface of the cover glass. Optical joystick. The method of claim 8, The light source unit includes a light joystick, characterized in that for reflecting the light generated from the light emitting module at a low angle toward the upper surface of the cover glass. The method of claim 7, wherein A light source unit is mounted adjacent to the cover glass, and the light source unit includes a light emitting module for emitting light and a light source guide for guiding light generated from the light emitting module to the cover glass, and the light source guide uses optical plastic. The light joystick, characterized in that to guide the light from the light emitting module to the cover glass at a low angle by using a total reflection. The method of claim 7, wherein And a blocking unit for blocking noise light is provided between the first and second waveguides. The method according to claim 1 or 2, And a button control unit configured to transmit a click button formed around the cover glass, a dome switch located below the click button, and an input value of the click button. A terminal body including a display unit; A cover glass partially exposed from the terminal body; A first waveguide including a first reflective surface positioned below the cover glass and a first flat convex lens portion configured to collect light reflected from the reflective surface, wherein the first waveguide is integrally formed with the first reflective surface and the first flat convex lens portion; ; And a second reflecting surface for reflecting light incident from the second planar lens portion facing the first planar lens portion, and the second planar lens portion and the second planar lens portion. A second waveguide in which two reflecting surfaces are integrally formed; An image sensor located below the second reflecting surface; And And a controller for moving the pointer displayed on the display according to the moving direction of the subject from the signal sensed by the image sensor. The method of claim 14, And the first and second waveguides are arranged to be symmetrical or asymmetrical to each other. The method of claim 14, The cover glass is a personal portable terminal, characterized in that formed integrally or separately with the first waveguide. The method of claim 16, A light source unit is mounted adjacent to the cover glass, and the light source unit includes a light emitting module for emitting light, wherein the light is directly or indirectly irradiated onto the cover glass. The method of claim 17, The light source unit comprises a reflective mirror for irradiating light generated from the light emitting module at a low angle toward the upper surface of the cover glass. The method of claim 17, A light source unit is mounted adjacent to the cover glass, and the light source unit includes a light emitting module for emitting light and a light source guide for guiding light generated from the light emitting module to the cover glass, and the light source guide uses optical plastic. And a total reflection to guide light from the light emitting module to the cover glass at a low angle. The method of claim 19, And a blocking unit for blocking noise light is provided between the first and second waveguides. The method of claim 14, And a button controller configured to transmit a click button formed around the cover glass, a dome switch located below the click button, and an input value of the click button.

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