KR20100023248A - Wileless pen input device - Google Patents

Abstract

PURPOSE: A wireless pen input device is provided to uniformly keep a change of motion based on a change of a location and a direction. CONSTITUTION: A lens module(150) converts light applied from a light source into parallel light. The lens module generates a different light route for a stepped difference of a bottom. An image sensor(130) senses a different light route according to the stepped difference of the bottom. The image sensor converts the sensed signal into an electric signal. A controller calculates a location change according to change during spatial location and direction movement of a pen module using the converted electric signal.

Description

Wireless pen input device {WILELESS PEN INPUT DEVICE}

The present invention relates to a wireless pen input device, and more particularly, to a wireless pen input device capable of detecting a change in position to input data into a portable electronic device and to obtain more clear data even when the pen is rotated or moved. In providing.

In general, a keypad and a mouse are widely used as input devices of an electronic device such as a computer or a mobile phone, and a touch-screen method for directly inputting a screen of a portable electronic device used recently is used. In this touch screen method, a finger or a stylus pen is directly contacted and inputted on a display displaying high quality.

However, in the case of the keypad, due to the miniaturization of the electronic device, as the buttons are gradually miniaturized, an input error is caused due to the inconvenience of inputting the keyboard or an interference caused by this. In addition, the mouse has a problem that the precision is very poor when making or devising a picture or letters directly on the application.

In addition, the method of using the touch screen has a problem that can be contaminated, deformed or damaged by touching the display surface.

Accordingly, a wired or wireless pen-type input device has been introduced to solve the problems of the keypad, the mouse, the touch screen, and the like, and for the convenience of the user.

As an example, a modified pen-type optical mouse method of the optical mouse has been introduced. A detailed configuration of such a form is shown in detail in Korean Patent Publication No. 10-2002-0085099 (filed date 20001.05.04, Samsung Electronics) and will be described below in general pen-type mouse.

1 shows an operation structure of a wireless pen input device according to the prior art. The wireless pen input device 10a generally applies the same principle as an optical mouse.

The digital paper on which the pattern is already drawn is measured by the image sensor provided in the main body 11. If the measurement is repeated again after a certain time to compare the two images, it is possible to calculate the change in position through a predetermined pattern to output the picture or text.

In this case, a relatively accurate position change can be detected, but there is a lot of trouble in using it in a portable electronic device that is used while carrying or moving because a separate digital paper is required.

In order to solve this problem is a wireless pen input device that does not have a separate digital paper shown in FIG.

As shown in FIG. 2, the main body 11, the LED 12, the image sensor 13, the pen tip 15 \ 4, the battery 15, and the controller of the wireless pen input device 10 are provided. It consists of. In addition, the light irradiated by the LED 12 is provided on the reflector 16 on the light path 17 so that the image pattern is received by the image sensor 13 is reflected on the bottom surface 21.

The controller may calculate a change in position through a pattern received by the image sensor 13 to output a picture or a text.

The wireless pen input device 10 as shown in FIG. 2 is a method of calculating a position change through comparison after measuring an image on a flat plate at a certain distance from a pen tip without a separate digital paper. It has a singularity, so its position is estimated.

However, when the transmission occurs like the glass surface, the image of the surface of the object on the glass floor must be measured and calculated. In this case, the distance from the image sensor 13 is not appropriate, so that the measured image is not clear. If the positional change due to the comparison cannot be calculated or if there is no defect in the surface, the comparison cannot be made, which is dependent on the bottom surface 21.

In order to improve the dependency of the bottom surface 21, a clearer image should be obtained through the surface of the bottom surface 21.

In addition, in order to obtain a clear image, there is a problem in that the brightness of the bottom surface 21 should always be kept above a certain level.

In particular, the position movement of the wireless pen input device 10 should be accurately represented when moving between letters. However, if the main body 11 is lifted to move the pen tip 14, the brightness of the bottom surface 21 when the light irradiated from the LED 12 forms on the bottom surface 21. When the distance and angle from the LED 12 is changed, the pattern formed on the image sensor 13 is weakened, and thus, the wireless pen input device 10 may not be detected.

In addition, when the wireless pen input device 10 lifts and moves the main body 11, there is a problem that the optical axis between the LED 12 and the image sensor 13 does not coincide. The position of illumination and the position of obtaining an image by the image sensor 13 are shifted.

For this reason, the position where an image is obtained becomes a dark illumination state when the main body is lifted, and the image obtained by the image sensor 13 becomes unclear.

Due to this problem, when the surface is bright and the bottom surface is bent, the movement of the wireless pen input device can be accurately obtained. Otherwise, the wireless pen input device can be recognized as not moving. Therefore, there is a problem that is inputted over the same letter or picture.

In addition, FIG. 3 measures the interference pattern caused by minute unevenness of the bottom surface 21 with the image sensor 13c using the light source 12c of the laser diode to measure the change in position with time. It is a structure to get.

As shown in FIG. 3, the structure of the pen type input device 10c using the laser diode as the light source 12c does not compare the image of the bottom surface 21 through the laser diode 12c. The movement is recognized through a change in the speckle image of the bottom surface 21.

In this case, there is a problem that the degree of movement in the left and right directions varies according to the characteristics or writing habits of the laser diode 12c, and the amount of movement according to the change in the angle or height of the pen-type input device 10c varies depending on the direction. Problems arise, there is a problem that does not properly reflect the handwriting of the actual user.

In addition, Figure 4 shows a schematic diagram between the light source and the image sensor of the bottom surface, Figures 5 to 8 to increase the magnification of the movement of the interference fringe image by moving the actual floor surface by the following formula (1) and formula (2). This figure shows the dependence of and angle.

Here, Ax and Ay are the movement of the interference pattern (x, y), Lo is the distance between the bottom surface and the image sensor, ax and ay are surface movement, and Ls is the radius of curvature of the laser diode (bottom surface). And θ s represent the angle between the laser diode and the bottom surface, and θ o represent the angle between the bottom surface and the image sensor, respectively.

Here, as in Equation 1 and Equation 2, it can be seen that the movement relationship of the speckle image according to actually moving the bottom surface is not 1: 1, and the x and y directions are different from each other.

5 to 8, when looking at the height and angle dependence of the interference fringe image movement magnification according to the actual movement of the bottom surface given by Equation 1 and Equation 2, the x and y directions according to the change of the height or angle It can be seen that the magnification is different.

Therefore, the angle or height when the pen-type input device is held in accordance with the writing habits of the user is different, and thus there is a problem in that the handwriting that varies according to the user cannot be reflected as it is.

In addition, since the height and angle are continuously changed during writing, it is impossible to fix them to a constant value, and the correction of the height and angle in real time also increases the production cost of the pen-type input device.

Therefore, in order to solve the problem of the change of the magnification according to the height or the angle, it is required to reduce the angle or height dependency in Equations 1 and 2.

In addition, when data is input by a pen-type mouse to a portable electronic device or the like, there is a need for a pen-type mouse capable of accurately measuring and calculating an image of an object surface according to a rotation of a pen or a trajectory of movement.

In addition, there is a need for a pen-type mouse capable of detecting a change in position according to a change in height of the pen.

Therefore, in order to solve the above problems, the present invention is a real user even if the degree of movement in the left and right directions according to the characteristics or writing habits of the laser diode is changed or the amount of movement according to the change in the angle or height of the pen varies depending on the direction. It is to provide a wireless pen input device that can accurately reflect the handwriting of.

Another object of the present invention is to provide a wireless pen input device capable of reflecting a handwriting that varies depending on an angle or height when a pen-type input device is held according to a writing habit of a user.

To this end, in the wireless pen input device having a pen module in contact with the bottom surface,

A pen-type mouse body of the wireless pen input device;

A light source provided in the main body to irradiate light to the bottom surface;

It is provided between the main body and the light source, located in the direction in which the light of the light source is irradiated to focus the light irradiated from the light source and to convert to parallel light to generate a different light path for the step of the bottom surface A lens module;

An image sensor provided in the main body and configured to detect light paths that are irradiated with parallel light by the lens module on the bottom surface and sense different light paths according to the step difference of the bottom surface and convert them into electrical signals; And

Disclosed is a wireless pen input device including a control unit that calculates a position change according to a change in a spatial position and a direction of the pen module using an electrical signal converted by the image sensor.

One end of the main body is provided with a first hole so as to transmit the parallelized light to the bottom surface while focusing through the lens module.

Disclosed is a wireless pen input device including a second hole portion for transmitting reflected light transmitted through the first hole portion to the bottom surface and having a different light path due to a step difference of the bottom surface to the image sensor. .

The light source discloses a wireless pen input device comprising a laser diode.

The lens module discloses a wireless pen input device comprising a collimate lens.

The light source irradiated from the laser diode is irradiated to the bottom surface in the form of a collimated beam through the collimated lens,

Disclosed is a wireless pen input device in which the collimated beam-type light is reflected to the image sensor while hitting the bottom surface and having a different light path according to the step difference of the bottom surface.

Through the reflected light introduced into the image sensor, the image sensor converts a signal of a different optical path according to the step of the bottom into an electrical signal, thereby reducing the shape of the bottom surface and the spatial position and orientation of the wireless pen input device. It can show the change of position according to the change in movement.

The position change form is calculated by the control unit to disclose a wireless pen input device for pointing the position change to the change in the movement of the spatial position and direction of the wireless pen input device.

The main body of the present invention discloses a wireless pen input device having a switch unit which detects pressing of the pen module so as to select, execute, and drag a program or menu on a screen so as to click, or adjust the screen up and down.

Disclosed is a wireless pen input device in which light emitted from the laser diode penetrates the collimated lens and penetrates the second hole and directly flows into the image sensor.

As described above, according to the wireless pen input device according to the present invention,

By providing a light source of the wireless pen input device as a laser diode and providing a collimated lens on a position spaced a predetermined length from the top of the laser diode, the light source has a form of a collimated beam, thereby providing a space for a pen type wireless input device. There is an effect that can maintain a constant change in the movement according to the change in position or direction.

In addition, this enables the user to point on the exact position desired by the user, when writing for handwriting recognition, etc., it is possible to reflect the handwriting of the user as it is, and there is an effect of clarifying the recognition rate of the user's handwriting.

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention.

As shown in FIG. 9, the wireless pen input device 100 including the pen module 140 in contact with the bottom surface includes a main body 110 and the bottom surface 21 of the wireless pen input device 100. The light source 120, the lens module 150, the image sensor 130, and the controller are provided in the main body 110 to irradiate light. The lens module 150 is positioned in a direction in which the light of the light source 120 is irradiated, focuses the light irradiated from the light source 120, and converts the light into parallel light so that the lens module 150 is positioned at the step of the bottom surface 21. It is provided between the main body 110 and the light source 120 to generate a different light path. The image sensor 130 detects a different optical path according to the step of the bottom surface 21 as well as the light irradiated with the parallel light by the lens module 150 on the bottom surface 21 to detect an electrical signal. It is provided in the main body 110 to convert to. The controller is provided in the main body 110 to calculate a position change according to a change in the spatial position and direction of the pen module 140 using the electrical signal converted by the image sensor 130.

As shown in FIGS. 9 and 11 to 13, one end of the main body 110 is provided with a first hole 111 and a second hole 112. The first hole 111 is a position spaced a predetermined distance apart from the upper end of the lens module 150 to transmit the parallel light through the lens module 150 to the bottom surface (21). It is provided in the main body 110. The second hole 112 is transmitted to the bottom surface 21 by the first hole 111 and reflected to reflect the reflected light having a different light path due to the step of the bottom surface 21. The main body 110 is provided on a position spaced a predetermined distance from the upper end of the image sensor 130 to flow into the sensor 130.

As shown in FIG. 9, the light source 120 includes a laser diode 120.

As shown in FIG. 9, the lens module 150 includes a collimate lens 150, and the light irradiated from the laser diode 120 penetrates the collimator lens 150 to focus the light. It is provided so as to prevent scattering and to irradiate the bottom surface 21 in the form of parallel light.

9 to 21, the light source 120 irradiated from the laser diode 120 is irradiated to the bottom surface 21 in the form of a collimated beam through the collimated lens 150. The collimated beam-type light is reflected by the image sensor 130 while hitting the bottom surface 21 to have a different light path according to the step of the bottom surface 21.

9 to 21, through the reflected light introduced into the image sensor 130, the image sensor 130 converts signals of different light paths according to the step of the bottom surface 21 into electrical signals. By changing the shape of the bottom surface 21 and the change in position according to the change in the spatial position and direction of the wireless pen input device 100, the position change form is calculated by the controller The position change is pointed at the change in the spatial position and direction of the wireless pen input device 100.

As shown in FIGS. 9 and 11 to 13, the main body 110 includes at least one switch 113. The switch unit 113 is provided so as to detect the pressing of the pen module 140 so that the program or menu on the screen can be selected, executed, and dragged, or the screen can be adjusted up and down.

9 and 11 to 13, the light irradiated from the laser diode 120 passes through the collimated lens 150 and passes through the second hole 112 and the image sensor. It is flowed directly into (130).

The operation of the wireless pen input device according to an embodiment of the present invention having the above configuration will be described in more detail with reference to FIGS. 9 to 21 as follows.

The wireless pen input device 100 is a device for inputting data and the like to a computer or a portable electronic device. The main body 110 of the wireless pen input device 100 preferably has a general pen shape, and preferably has a circular or elliptical shape that is easy to be held by a user.

The pen module 140 is provided with a replaceable pen tip 140 serving as a reference point for forming an image pattern and the like by contacting the bottom surface 21 and an elastic member providing elastic force according to a user's pressing pressure. It is preferable to comprise a piezoelectric element.

In addition, the pen tip may be divided into a nib with ink and a nib without ink, and the pen tip is displayed on the bottom surface 21 or paper according to the pressing pressure, so that a computer or a portable It can be displayed on a display such as an electronic device.

At least one switch unit 113 for detecting a user's touch or press is provided on the outer circumference of the wing body 110.

9 and 14 to 21, the light source 120 includes the laser diode 120.

The light irradiated from the laser diode 120 is spaced apart from the laser diode 120 by a predetermined length to pass through the collimated lens 150 provided in the irradiation direction of the light. The light irradiated from the laser diode 120 penetrates the collimated lens 150, focuses the light scattered from the laser diode 120, and is irradiated in parallel to the bottom surface 21. Irradiated in the form of parallel light.

Light paralleled through the collimated lens 150 is irradiated to the bottom surface 21 through the first hole 111.

Since the bottom surface 21 has a step, light paralleled while passing through the collimated lens 150 hits the bottom surface 21 and is reflected toward the image sensor 130, thereby providing different light paths. Will have

If the different optical path difference is an integer multiple of the wavelength of the laser diode 120, the interference is guaranteed. When the integer multiple of the wavelength of the laser diode 150 is +0.5 times, a destructive interference occurs.

Light hitting the bottom surface 21 and having a different light path is directly introduced into the image sensor 130 through the second hole 112 and received.

At this time, through the light received by the image sensor 130, the pattern recognition is shown as shown in FIG. When the position of the wireless pen input device 100 is changed, the pattern is moved.

The light irradiated from the laser diode 120 through the collimated lens 150 is not scattered and the focal point is parallel with the gathering, thereby hitting the bottom surface 21 to form a stepped shape of the bottom surface 21. It is possible to be received by the image sensor 130 is reflected by the.

The controller reads the pattern received by the image sensor 130, compares the pattern change of the image sensor 130, detects the changed amount, and displays the changed amount clearly on a display of a computer or a portable electronic device.

Therefore, as the position of the wireless pen input device changes, such as rotation or height, the position information can be accurately obtained. When the user writes, the information is superimposed on the same letter or picture according to the change of position or spatial change. It prevents the input.

The relationship between the bottom surface 21 and the movement of the pattern image may be expressed as Equations 3 and 4 by summarizing Equations 1 and 2, respectively.

By using the collimator lens 150 of the radius of curvature of the laser diode in Equations 1 and 2, it can be seen that Ls, that is, the radius of curvature becomes infinitely large because its characteristics have the shape of a collimated beam.

Therefore, Equations 1 and 2 can be represented by Equations 3 and 4, respectively.

Here, Ax, Ay represents the movement (x, y) of the speckle, ax, ay is the surface movement, θs is the angle between the laser diode 120 and the bottom surface 21, θo is the bottom The angle between the surface 21 and the image sensor 130 is shown, respectively.

Looking at Equations 3 and 4, the magnification becomes 1 in the y direction, and it can be seen that the height dependence can be removed in the x direction and only the angle dependence is obtained.

14 to 17 illustrate the change in magnification in the x and y directions when the laser diode 120 has the form of a collimated beam passing through the collimated lens 150 from Equation 3 and Equation 4. It is shown.

14 and 15 are views showing when ax, ay, az is 0.025mm, and FIG. 14 shows ax, ay of 0.025mm and az of 0. FIG.

14 to 17, it can be seen that the dependency of the height of the wireless pen input device 100 is removed.

18 to 21 show the magnification in the x and y directions according to the use of the collimated lens 150 on the upper end of the laser diode 120 according to the change of the angle of the wireless pen input device 100. The figure which shows the change.

As shown in FIGS. 18 to 21, when the az movement is the same as ax and ay, the change rate of the magnification in the x and y directions is different compared to the case where the collimator lens 150 is not used. You can see that it has been significantly reduced.

Moreover, as the angle changes by about 40 °, the rate of change is within 9%.

In addition, as shown in FIGS. 20 and 21, assuming that there is no change in az, a change in magnification within 1% is shown according to the change in angle.

Therefore, by using a laser diode as a light source in the wireless pen input device and having a collimated lens on an optical path through which light is irradiated to the top of the laser diode, the light is made into a collimated beam to focus the light. In addition to being able to be parallel to, and also, it is possible to maintain a constant change in the movement according to the change in the spatial position or direction of the wireless pen input device.

Therefore, when a user writes using a wireless pen input device, a change in movement due to a change in position such as an angle or height is received by the image sensor through the laser diode and the collimator lens, and the received image pattern is received. Through the control by the control unit it is possible to represent the position change value to the display window can reflect the user's handwriting as it is.

The wireless pen input device 100 of the present invention described above is not limited to the above-described embodiments and drawings, and various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in the art.

For example, as illustrated in FIGS. 9 and 11, the laser diode 120 and the collimating lens 150 are disposed adjacent to the position of the first hole 111, and the image sensor 130 is provided. ) Is provided adjacent to the position of the second hole 112, but as shown in FIGS. 12 and 13, the position of the laser diode 120 and the collimating lens 150 is determined by the second hole. It may be provided adjacent to the position of 112, and to change the position of the image sensor 130 to be adjacent to the position of the first hole (111).

In addition, although only one switch unit 113 is illustrated in the drawing, the switch unit 113 may be changed so that at least one of the switch unit 113 may be provided at an outer circumference of the main body 110.

In addition, although the first and second hole parts 111 and 112 are formed as holes to allow light to pass therethrough, the window is arranged so that light paralleled through the collimating lens 150 is irradiated toward the bottom surface 21. It is also possible to install it.

1 is a view showing a wireless pen input device according to the prior art.

2 is a view showing the internal structure of a wireless pen input device according to the prior art.

3 is a view showing another embodiment in the wireless pen input device according to the prior art.

4 is a view showing a schematic diagram of a light source and an image sensor in a wireless pen input device according to the prior art.

5 to 8 are graphs showing the dependence of the height and angle of the magnification of the movement of the trunk image as the bottom surface is moved in the wireless pen input device according to the related art.

9 is a view showing the internal structure of a wireless pen input device according to an embodiment of the present invention.

10 is a view showing an interference pattern reflected by dimming a bottom surface of a white paper by a laser diode in a wireless pen input device according to an exemplary embodiment of the present invention.

FIG. 11 is a view illustrating a shape of a pen module by a bottom surface and light emitted from a light source according to a shape of a pen module when a main body of the wireless pen input device is raised upward in the wireless pen input device according to an exemplary embodiment of the present invention. A diagram showing a state where the light is received by the image sensor after penetrating through the bottom surface.

12 to 13 are views showing a state provided by changing the position of the light source and the collimating lens provided on the top of the light source and the image sensor in the wireless pen input device according to an embodiment of the present invention.

14 to 15 are views showing a change in height dependency of magnification in a wireless pen input device according to an embodiment of the present invention. (Lo = 20mm, Ls = 20mm, Δθ = 7, ax, ay, az = 0.025mm)

16 to 17 are diagrams illustrating a change in height dependency of magnification in a wireless pen input device according to an exemplary embodiment of the present invention. (Lo = 20mm, Ls = 20mm, Δθ = 7, ax, ay = 0.025mm , az = 0)

18 to 19 are diagrams illustrating a change in dependency improvement of a tilting angle of magnification in a wireless pen input device according to an exemplary embodiment of the present invention. (Lo = 15mm, Ls = 20mm, and Δθ = 7 , ax, ay, az = 0.025mm)

19 to 21 are diagrams illustrating a change in dependency improvement of a tilting angle of magnification in a wireless pen input device according to an exemplary embodiment of the present invention. (Lo = 15mm, Ls = 20mm, Δθ = 7 , ax, ay = 0.025mm, az = 0)

Claims (8)

In the wireless pen input device having a pen module in contact with the bottom surface, A pen-type mouse body of the wireless pen input device; A light source provided in the main body to irradiate light to the bottom surface; It is provided between the main body and the light source, located in the direction in which the light of the light source is irradiated to focus the light irradiated from the light source and to convert to parallel light to generate a different light path for the step of the bottom surface A lens module; An image sensor provided in the main body and configured to detect light paths that are irradiated with parallel light by the lens module on the bottom surface and sense different light paths according to the step difference of the bottom surface and convert them into electrical signals; And And a controller configured to calculate a position change according to a change in the spatial position and the direction of the pen module by using the electrical signal converted by the image sensor. The method of claim 1, One end of the main body is provided with a first hole to transmit the parallelized light to the bottom surface while focusing through the lens module. The wireless pen input device is characterized in that the second hole for introducing the reflected light is transmitted to the bottom surface by the first hole to reflect the light path having a different light path due to the step difference of the bottom surface. . The method of claim 2, The light source is a wireless pen input device, characterized in that consisting of a laser diode (Laser Diode). The method of claim 3, The lens module is a wireless pen input device, characterized in that made of a collimate lens (collimate lens). The method of claim 4, wherein The light source irradiated from the laser diode is irradiated to the bottom surface in the form of a collimated beam through the collimated lens, And the collimated beam type light is reflected to the image sensor while hitting the bottom surface and having a different light path according to the step difference of the bottom surface. The method of claim 5, Through the reflected light introduced into the image sensor, the image sensor converts a signal of a different optical path according to the step of the bottom into an electrical signal, thereby reducing the shape of the bottom surface and the spatial position and orientation of the wireless pen input device. It can show the change of position according to the change in movement. The position change type is calculated by the control unit wireless pen input device, characterized in that pointing the position change to the change in the movement of the spatial position and direction of the wireless pen input device. The method of claim 1, The main body of the wireless pen input device is characterized in that the switch to detect the pressing of the pen module to click, to select, execute, and drag the program or menu on the screen, or to adjust the screen up and down . The method of claim 1, The light emitted from the laser diode penetrates the collimating lens, penetrates the second hole, and flows directly into the image sensor.

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