KR20120013068A - Grid signal receiver with improved pointig performance, wireless pointing system having the same and gradient correction method in the wireless pointing system - Google Patents

Abstract

PURPOSE: A grid signal receiver with increased pointing performance, a wireless pointing system with the same, and a gradient correcting method in the wireless pointing system are provided to enable four sensors to recognize signals wherein the four sensors cross each other. CONSTITUTION: A grid signal receiver(20) comprises first and second X detectors and first and second Y detectors. The first and second X detectors detect a vertical pattern signal of a grid. At least two sensors are horizontally arranged in the first and second X detectors. The first and second Y detectors detect a horizontal pattern signal of a grid. The first and second Y detectors are vertically arranged in at least two sensors.

Description

GRID SIGNAL RECEIVER WITH IMPROVED POINTIG PERFORMANCE, WIRELESS POINTING SYSTEM HAVING THE SAME AND GRADIENT CORRECTION METHOD IN THE WIRELESS POINTING SYSTEM}

The present invention relates to a grid signal receiver with improved wireless pointing performance, a wireless pointing system including the same, and a tilt correction method in a wireless pointing system. The present invention provides a method of increasing the resolution of wireless pointing through a double array sensor array of sensors in the grid signal receiver. The present invention relates to a grating signal receiver having an improved wireless pointing performance, which can reduce manufacturing cost compared to the resolution improvement, a wireless pointing system including the same, and a tilt correction method in the wireless pointing system.

Recently, with the development of major video appliances such as TVs, DVDs, set-top boxes, and IPTVs, there is an urgent need for the implementation of a pointing device capable of pointing like a PC mouse on the screen.

In particular, IPTV has evolved as a means of replacing a PC in a general home, and therefore, a user needs a pointing device such as a mouse in a PC for smooth operation. However, since the pointing device cannot be wired like a mouse of a general PC due to the characteristics of a video home appliance, the pointing device is mostly implemented using a conventional TV remote control. Until now, much effort has been made to implement wireless pointing functions in video home appliances, but due to low performance, high cost, and reliability problems, commercialization has not been made in earnest yet.

Among the wireless pointing devices, the most popular method is a wireless pointing device using a grid structure generating remote controller. 1 is a conceptual diagram of a wireless pointing device using such a lattice structure.

The wireless pointing device implements a pointing function by adding LEDs that make light of a grid window to a transmitting end. Receiver measures the moving direction, the moving speed, and the size according to the number of lines passing through and the pattern of light being sensed to drive the mouse pointer to the image electric appliances such as TV.

This method has the advantage of implementing the wireless pointer at low cost because the receiver does not need additional preparation except for the transmitting device of the remote controller system because the receiver performs the movement operation. Therefore, when the grid of light is tilted, there is a problem that frequently occurs.

Recently, when implementing the grid-type wireless pointing system, an additional sensor for tilt check is added to a receiver to correct an error due to the tilt of the grid.

Meanwhile, in terms of the performance of wireless pointing in the above-described lattice-type wireless pointing system, a representative way to increase the performance is to increase the number of grids of the transmitting end so that more grid signals are projected in a predetermined reception space. will be. This increases the spatial resolution and allows for smoother wireless pointing than before.

However, this method of increasing the number of gratings in the lattice structure increases the performance of the transmitter optical system, which can cause a sharp increase in cost, and in addition, precise adjustment of the spacing between the sensors in the receiver is necessary. .

In order to solve the above problems, the present invention provides a grid signal receiver for applying a double array sensor array to an array of sensors in a grid signal receiver so as to increase the resolution of the wireless pointing and at the same time reduce the manufacturing cost compared to the resolution improvement. The present invention provides a wireless pointing system and a tilt correction method in the wireless pointing system.

In addition, in the double array sensor structure, two X detectors and two Y detectors are configured, respectively, so that four sensors composed of staggered arrangements of one axis are recognized, respectively, thereby recognizing a grid of one axis by two sensors (5 sensors. In contrast, the present invention provides a grid signal receiver having a high motion vector sensitivity and resolution, a wireless pointing system including the same, and a tilt correction method in the wireless pointing system.

Alternatively, in the double array sensor structure, two X detectors and two Y detectors may be configured, respectively, and one grid may be recognized by the two detectors, and the two recognition results may be synthesized to calculate a motion vector for motion of one axis. Accordingly, the present invention provides a grid signal receiver that enables more accurate motion calculation, a wireless pointing system including the same, and a tilt correction method in the wireless pointing system.

In addition, unlike the conventional five-sensor structure of the grating structure receiver provides a grid signal receiver that can accurately compensate the tilt of the transmitter without omitting the tilt detection sensor, a wireless pointing system including the same, and a tilt correction method in the wireless pointing system It is.

The present invention is a means for solving the above-described problem, the grid signal receiver for receiving the grid signal from the grid signal transmitter for generating and outputting the grid signal to detect the movement of the grid signal transmitter, the vertical pattern of the grid (Y Axis pattern) and a first X detector in which at least two sensors are arranged horizontally, and a first Y detector in which at least two sensors are arranged vertically and detecting a horizontal pattern (X axis pattern) signal of a second X detector and a grid. And a second Y detector, wherein the first X detector and the second X detector are arranged at positions not collinear with each other and staggered so that each sensor detects the same pattern of the grating at different times. The Y detector and the second Y detector are arranged at positions that are not collinear but staggered so that each sensor detects the same pattern of the grating at different times. Characterized in that the column.

Preferably, the first X detector and the second X detector are each composed of a pair of sensors, and one sensor of the other detector is located on the center (1/2 point) line of the pair of sensors of one detector. Staggered so as to be positioned, the first Y detector and the second Y detector each comprised of a pair of sensors, one of the other detectors on the center (1/2 point) line of the pair of sensors of one detector It is characterized by being staggered so that the sensors are located.

More preferably, the vertical separation distance between the sensors between the first X detector and the second X detector is equal to the separation distance between a pair of sensors of one detector, and the sensor between the first Y detector and the second Y detector. Horizontal separation distance is characterized in that the same as the separation distance between a pair of sensors of one detector.

More preferably, the grating signal receiver further comprises a motion vector processor for receiving a detection signal from each of the sensors, processing a motion vector, and calculating a tilt of the grating to correct the motion vector. do.

More preferably, the motion vector processor calculates a motion vector for the received signal of the first X detector and calculates a motion vector for the received signal of the second X detector to synthesize each motion vector. .

More preferably, the motion vector processor calculates a motion vector with respect to the received signal of the first Y detector and calculates a motion vector with respect to the received signal of the second Y detector to synthesize each motion vector. .

More preferably, the motion vector processor calculates and corrects the inclination of the grating by comparing the relative grating sensing times of three adjacent sensors in a triangular arrangement.

Meanwhile, according to another aspect of the present invention, a grid signal transmitter for generating and outputting a grid signal; A grating signal receiver configured to receive the grating signal and detect movement of the grating signal transmitter; The grid signal receiver may include a vertical pattern (Y-axis pattern) signal of the grating, and the first X detector and the second X detector and the horizontal pattern (X-axis pattern) of at least two sensors arranged horizontally. A first Y detector and a second Y detector that sense a signal and at least two sensors are arranged vertically, wherein the first X detector and the second X detector are arranged in a non-collinear position, each sensor of the grating Staggered to detect the same pattern at different times, wherein the first Y detector and the second Y detector are arranged in positions that are not collinear, but staggered so that each sensor detects the same pattern of the grating at different times It provides a wireless pointing system, characterized in that.

Meanwhile, according to another aspect of the present invention, in the method for correcting the slope of the grid signal transmitter by receiving the grid signal from the grid signal transmitter for generating and outputting the grid signal, three adjacent grid detection sensors in a triangular arrangement Detecting each grating detection time for and constructing a virtual vertical triangle in the triangular arrangement through the detected grating detection time to calculate the slope value through the arc tangent processing to correct the slope of the grid signal transmitter A tilt correction method in a wireless pointing system is provided.

Advantageously, the tilt correction method comprises the steps of: (a) detecting a grating detection time at three adjacent sensors in a triangular arrangement; (b) calculating a time t ₂ by subtracting the grating detection time of the second sensor from the grating detection time of the first sensor located on the same line; (c) The lattice detection time of the first sensor is subtracted from the lattice detection time of the third sensor disposed perpendicular to the intermediate position of the first sensor and the second sensor on the same line, and the half value of t ₂ is subtracted. Calculating time t ₁ ; (d) calculating an inclination value by performing arc tangent treatment on the ratio of t ₂ and t ₁ ; And (e) correcting the slope of the grid signal transmitter based on the calculated slope value; Characterized in that it comprises a.

According to the present invention, it is possible to reduce the manufacturing cost in comparison with the resolution improvement while increasing the resolution of the wireless pointing through the double array sensor array in the grating signal receiver.

In addition, in the double array sensor structure, two X detectors and two Y detectors are configured, respectively, so that four sensors composed of staggered arrangements of one axis are recognized, respectively, thereby recognizing a grid of one axis by two sensors (5 sensors. Structure), the motion vector sensitivity and resolution are increased.

Alternatively, in the double array sensor structure, two X detectors and two Y detectors may be configured, respectively, and one grid may be recognized by the two detectors, and the two recognition results may be synthesized to calculate a motion vector for motion of one axis. There is also an effect that enables more accurate motion calculation.

In addition, unlike the conventional five-sensor structure of the grating structure receiver, there is an effect that it is possible to accurately correct the tilt of the transmitter without omitting the tilt detection sensor.

1 is a conceptual diagram of a wireless pointing device using a lattice structure.
2 is a block diagram of a wireless pointing device to which the present invention is applied.
3 is a view for explaining a five-sensor structure of the signal detection unit of the conventional method.
4 is a diagram illustrating a sensor configuration of a signal detection unit according to the present invention.
5 is a view for explaining a tilt correction method in a five-sensor structure of a conventional grid signal receiver.
6 is a view for explaining a tilt correction method in a grating signal receiver according to the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description, the structure of the double array sensor according to the present invention will be described in comparison with the five-sensor structure of the signal detection unit in the wireless pointing device using the lattice structure.

First, the wireless pointing device to which the present invention is applied will be described.

2 is a block diagram of a wireless pointing device to which the present invention is applied.

Referring to FIG. 2, the wireless pointing device to which the present invention is applied may receive a grid signal transmitter 10 generating a grid-shaped signal and a signal of the grid-structure to determine movement from the received grid signal. A grid signal receiver 20 is included.

The grid signal transmitter 10 includes a light source (for example, an LED may be used) and a grid generator to transmit light of a grid structure to implement a pointing function. The transmitted grid light is detected by the sensor at the grid signal receiver 20, and the motion direction and the speed are calculated to calculate the motion vector. The pointer on the screen. Referring to FIG. 2, the wireless pointing device to which the present invention is applied will be described in detail as follows.

The grid signal transmitter 10 includes a MICOM 11, an X-grid generator 14, a Y-grid generator 15, a first lens 16, and The second lens 17 is included. Through this, the grating signal transmitter 10 will generate an infrared signal having a grating structure (light other than infrared light may be used within the scope of the object of the present invention).

The microcomputer 11 generates a signal having a carrier frequency on each axis (X axis and Y axis). Here, the X axis is an axis where the grid signal transmitter 10 generates grid lines in the horizontal direction, and the Y axis is an axis where the grid signal transmitter 10 generates grid lines in the vertical direction. At this time, the generated signal will be converted into an infrared signal through the infrared LED. In this case, the generated X-axis carrier frequency signal and the Y-axis carrier frequency signal may use the same frequency, but it is preferable to use signals in different frequency domains to prevent mutual interference. For example, the X-axis carrier frequency signal may be generated within 30 ~ 40KHz, the X-axis carrier frequency signal may be generated within 41 ~ 50Hz.

The X-side grating generator 14 receives an X-axis carrier frequency signal and generates an X-axis pattern (IR X-axis grating signal). That is, the X-side grating generator 14 transmits light output through the LED to generate an X-axis pattern (IR X-axis grating signal). The Y-axis grating generator 15 receives the Y-axis carrier frequency signal and generates a Y-axis pattern (IR Y-axis grating signal). That is, the Y-axis grating generator 45 transmits light output through the LED to generate a Y-axis pattern (IR Y-axis grating signal). The X-axis lattice generator 14 and the Y-axis lattice generator may be formed of a plate in which the X-axis pattern and the Y-axis pattern of the grid pattern are etched, and the material may be made of a material such as glass that can transmit light (infrared rays). have.

The first lens 16 transmits the X-axis pattern (IR X-axis grating signal) and scatters it around the grating signal receiver 20. The second lens 17 transmits the Y-axis pattern (IR Y-axis grating signal). It is then sprayed around the grid signal receiver 20. The first and second lenses 16 and 17 are made of a material capable of transmitting light (infrared rays).

In the present invention, in addition to the method of generating the X-axis pattern signal and the Y-axis pattern signal as described above, the grating signal transmitter 10 may simultaneously generate the X-axis pattern and the Y-axis pattern (the grid generator is the XY-grid generator). In addition, one carrier frequency signal may be used to generate a grid pattern.

Also, referring to FIG. 2, the grating signal receiver 20 analyzes the grating signal by analyzing a received signal and a signal detector 21 for detecting an infrared grating signal generated from the grating signal transmitter 10. 10, a motion vector processor (22) for determining the motion of the motion.

In this case, in the conventional five-sensor structure of the signal detector, five sensors of the signal detector 21 are configured as shown in FIG. 3.

Referring to FIG. 3, the signal detector 21 according to the conventional method includes horizontal motion sensors A and B for determining left and right movements (X-axis movement), and vertical motion sensors C for determining vertical movements (Y-axis movement). , D) and a tilt detection sensor E for determining tilt.

The motion discrimination method in the conventional 5-sensor structure is briefly described as follows.

When the grid signal transmitter 10 moves, the grid generated by the grid signal transmitter 10 moves. Accordingly, the signal detector 21 in the grating signal receiver 20 receives the light of the grating. Here, each of the sensors A, B, C, D, and E may be configured as a photodiode capable of detecting light and converting the light into an electrical signal.

In this conventional method, the tilt of the grid signal transmitter 10 is determined by the tilt detection sensor E. FIG. For example, the inclination may be determined through the sensor A and the sensor E. FIG. If the inclination of the grating occurs, the inclination of the grating signal transmitter 10 is determined through this because the time at which the vertical grating pattern is received at the sensor A and the sensor E is different. In addition, the inclination direction and angle of the grid signal transmitter 10 are determined through the grid recognition order of the sensors A, B, and E.

Unlike the conventional five-sensor structure described above, the improved structure of the present invention configures the sensors of the signal detector 21 in the double array sensor structure as shown in FIG. 4 in order to increase the motion pointing performance.

4 is a diagram illustrating a sensor configuration of a signal detector according to the present invention.

Referring to FIG. 4, the signal detector 21 according to the present invention includes the first X detectors P_A1 and P_B1 in which two sensors are arranged horizontally to determine left and right movements (X-axis movements) of a lattice structure. 1 X detectors (P_A1, P_B1) are spaced apart below the second X detectors (P_A2, P_B2) in which two sensors are arranged horizontally to determine the left and right movements (X-axis movement) of the grid structure and the top and bottom of the grid structure In order to determine the movement (Y-axis movement), two sensors are vertically arranged to be spaced apart on the right side of the first Y detectors P_D1 and P_C1 and the first Y detectors P_D1 and P_C1, and the vertical movement of the grid structure ( The sensor configuration is made up of the second Y detectors P_D2 and P_C2 in which two sensors are arranged vertically to determine the Y-axis movement. Therefore, in the double array sensor structure of the present invention, the tilt detection sensor for determining the inclination, unlike the existing structure is omitted.

As a result, such a double array sensor structure has an increased shape of each detector by one more than the X detectors (A, B) and Y detectors (C, D) in the conventional five sensor structure (see FIG. 3). The load sensor E has been removed.

That is, the signal detector 21 has two X detectors (P_A1, P_B1 and P_A2, P_B2) for determining left and right movements (X-axis movement), and two Y detectors for determining vertical movement (Y-axis movement). It consists of (P_D1, P_C1 and P_D2, P_C2), it is possible to determine not only the moving direction and the moving speed of the grating signal transmitter 10 but also the inclination using only the X and Y detectors configured as described above.

Here, when the distance between the sensors in one detector is 2a, the horizontal separation position between the detectors should be positioned at a distance to have an optimal space efficiency. In the figure, b is the vertical distance between the detectors (the distance between the X and Y detectors is not important).

That is, referring to the arrangement of the X detectors in the drawing, the second X detectors P_A2 and P_B2 positioned below the first X detectors P_A1 and P_B1 are the 1-1 X sensors in the first X detectors P_A1 and P_B1. The 2-1X sensor P_A2 of the second X detectors P_A2 and P_B2 is positioned at the center position of the distance of 2a where P_A1 and the 1-2X sensor P_B1 are horizontally spaced, and 2-1-1 The X sensor P_A2 also maintains a horizontal separation distance of 2a from the 2-2 X sensor P_B2 in the detector. The horizontally arranged 1-1 X sensor P_A1 and 1-2 X sensor P_B1, and the 2-1 X sensor P_A2 and the 2-2 X sensor P_B2 below the vertical direction of b It will have a separation distance.

Similarly, referring to the arrangement of the Y detectors in the drawing, the second Y detectors P_D2 and P_C2 positioned on the right side of the first Y detectors P_D1 and P_C1 are configured as 1-1 Y sensors in the first Y detectors P_D1 and P_C1. The 2-1 Y sensor P_D2 of the second Y detectors P_D2 and P_C2 is positioned at the center position of the distance of 2a where P_D1 and the 1-2 Y sensor P_C1 are vertically spaced, and 2-1-1. The Y sensor P_D2 also maintains a vertical separation distance of 2a from the 2-2 Y sensor P_C2 in the detector. The 1-1 Y sensor P_D1 and the 1-2 Y sensor P_C1 disposed vertically, and the 2-1 Y sensor P_D2 and the 2-2 Y sensor P_C2 on the right side thereof are horizontal to b. It will have a separation distance.

In this structure, in the wireless pointing method, the grid signal receiver 20 receives the grid generated by the grid signal transmitter 10 and determines the direction according to the pattern. The motion determination method is briefly described as follows.

1) The grid signal transmitter 10 moves to move the grid generated by the grid signal transmitter 10

2) the grid signal receiver 20 receives the light of the grid;

3) The direction is determined according to the grid recognition pattern of the sensors in the grid signal receiver 20.

4) Apply the determined direction to the pointer

When the above-described motion determination method is applied, the double array sensor structure according to the present invention has two X detectors and two Y detectors, so that four sensors composed of staggered grids of one axis are recognized at different times. This results in up to twice the sensitivity and resolution of the motion vector as compared to the conventional structure (5-sensor structure) that recognizes a grating on one axis.

For example, in such a motion determination method, motion determination is performed through four recognition angles recognized by four sensors (P_A1, P_B1, P_A2, and P_B2) which are arranged in a staggered arrangement of one axis (Y-axis pattern). And the resolution can be dramatically improved compared to the conventional method.

In addition, in the double array sensor structure of the present invention, in addition to the above-described motion determination method, two X detectors and two Y detectors are configured, respectively, two axes of one axis are recognized by two detectors, and the two recognition results are synthesized. By calculating the motion vector for the motion of the axis, it is possible to calculate the motion vector with less error and refine the motion vector using only one detector.

For example, in such a motion determination method, a grid (Y-axis pattern) of one axis is recognized by one detector (P_A1, P_B1) and two detectors (P_A2, P_B2), respectively, and these two recognition results are synthesized to perform motion on one axis of motion. Since the vector is calculated, it is possible to calculate the motion with less error than the conventional method.

Now, the correction method according to the tilt of the grid signal transmitter 10 in the double array sensor structure according to the present invention will be described.

Prior to this, the tilt correction method of the conventional 5-sensor structure will be described with reference to FIG. 5.

Referring to FIG. 5, when the inclination of the grid occurs in the inclination detection sensor E and the horizontal motion sensors A and B, the inclination angle is obtained through Equation 1 using t ₁ and t ₂ . The angle θ was calculated and applied to the rotation matrix.

Here, t ₁ is the time until the grating signal reaches the first horizontal motion sensor A after the tilt detection sensor E or is detected by the tilt sensor E after the first horizontal motion sensor A. , t ₂ is a value until the lattice signal reaches the second horizontal motion sensor B after the first horizontal motion sensor A or is detected by the first horizontal motion sensor A after the second horizontal motion sensor B. It's time. The precondition for this tilt correction is that the distance between the tilt detection sensor E and the first horizontal motion sensor A is the same, and the distance between the first horizontal motion sensor A and the second horizontal motion sensor B. Is the same, and the line connecting the inclination detection sensor (E) and the first horizontal motion sensor (A) and the line connecting the first horizontal motion sensor (A) and the second horizontal motion sensor (B) form a right angle.

Therefore, in this conventional method, if the grid moves to the right, the grid will touch the sensor in order from E->A-> B, and the speed of movement to the right is almost unchanged because the distance between the sensors is very short. Therefore, if the movement is assumed to be constant velocity movement, the movement distance is proportional to time. As a result, the slope of the trigonometric function is obtained by substituting the ratio of the recognition time t ₁ and t ₂ into the trigonometric function of Equation 1 above. The slope thus obtained is used to correct the motion vector through the rotation transformation.

A tilt correction method in the double array sensor structure according to the present invention will be described with reference to FIG. 6 as compared to the tilt correction method in the conventional five sensor structure.

In the double array sensor structure of the present invention, as shown in FIG. 6, T (P_A1), which is the time when the grid signal is detected by the 1-1X sensor P_A1, and the grid signal is detected by the 1-2X sensor P_B1. The angle of inclination? Here all conditions are assumed to be constant velocity.

This tilt correction will be described below in two different forms of double array sensor structure. That is, referring to FIG. 6, b 'representing the horizontal separation distance between the sensors in the detector and b representing the vertical separation distance of the sensors between the detectors may be manufactured differently according to the form of the receiver design. Basically, the horizontal separation distance (b ') between the sensors in the detector and the vertical separation distance (b) of the sensors between the detectors may be the same (b' = b), but the detectors are considered in consideration of design problems and integration conditions of the receiver. The horizontal separation distance b 'between the sensors and the vertical separation distance b of the sensor between the detectors may be different (b' ≠ b).

First, when the horizontal separation distance b 'between the sensors in the detector and the vertical separation distance b of the sensors between the detectors are the same (b' = b), Equation 2 below is established.

In the above equation, T (P_B1) is the time when the lattice signal is detected by the 1-2X sensor P_B1, T (P_A1) is the time when the lattice signal is detected by the 1-1X sensor P_A1, and T P_A2 is a time at which the grating signal is detected by the 2-1X sensor P_A2, and T (P_Zc) is a grating signal of the 1-1X sensor P_A1 and the 1-2X sensor P_B1. It is the time detected by the virtual point Zc in the middle.

And another virtual point Z1 in the figure is at a point between the 1-1 X sensor P_A1 and the 1-2 X sensor P_B1 when the grating signal is detected by the 2-1 X sensor P_A2. Located.

Therefore, the times t ₂ and t ₁ may be calculated by the following Equation 3.

Here, t ₁ may be solved again as in Equation 4 below.

Therefore, the inclination angle θ of the inclined grating signal shown in FIG. 6 can be determined through Equation 5 below.

That is, in the method of correcting the tilt of the grid signal transmitter, when the respective grid detection times of three adjacent grid detection sensors P_A1, P_B2, and P_A2 in a triangular arrangement are detected, the detected grid detection time is detected. Through this, the virtual vertical triangle may be configured in the triangular arrangement formed by the grating detection sensors P_A1, P_B2, and P_A2. In addition, by performing an arc tangent process on the virtual vertical triangle, it is possible to calculate an inclination value (angle θ) of the grid signal transmitter.

To sum it up, the grating detection time of the three adjacent sensors in the triangular arrangement is detected, and the time t ₂ is calculated by subtracting the grating detection time of the second sensor from the grating detection time of the first sensor located on the same line. And subtracting the lattice detection time of the first sensor from the lattice detection time of the third sensor disposed perpendicular to the intermediate position of the first sensor and the second sensor on the same line, and subtracting half of the time t ₂ . Calculate t _1, and calculate the inclination value of the grating signal transmitter by performing arc tangent processing on the ratio of t ₂ and t ₁ .

Next, when the horizontal separation distance (b ') between the sensors in the detector and the vertical separation distance (b) of the sensors between the detectors are different (b' ≠ b), the proportional constant k of b 'and b is multiplied by t ₂ . The slope angle θ of the true grid signal can be determined by the following equation (6).

Therefore, in order to reduce the calculation amount of the tilt correction, the horizontal separation distance b 'between the sensors in the detector and the vertical separation distance b between the detectors are the same (b' =). b) one structure is more effective.

6 and the above description, T (P_A1), which is the time detected by the 1-1X sensor P_A1, and T (P_B1), which is the time when the grating signal is detected by the 1-2X sensor P_B1. And a process of determining the inclination angle θ based on T (P_A2), which is a time at which the grating signal is detected by the 2-1X sensor P_A2, is described. However, the principles of the present invention are not limited thereto. In addition to the three sensors described above, any three adjacent sensor combinations (combinations of sensors occupying the vertex positions of the triangle) may be used to determine the inclination angle θ. For example, a combination of the 1-1 X sensor P_A1, the 1-2 X sensor P_B1 and the 2-1 X sensor P_A2, the 1-2 X sensor P_B1, which is in a triangular arrangement, Combination of 2-1 X sensor P_A2 and 2-2 X sensor P_B2, 2-1 Y sensor P_D2, 1-1 Y sensor P_D1 and 1-2 Y sensor P_C1 , A combination of the 2-1 Y sensor P_D2, the 2-2 Y sensor P_C2, and the 1-2 Y sensor P_C1 is possible.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

10: grid signal transmitter 11: microcomputer
14: X-side grid generator 15: Y-side grid generator
16: first lens 17: second lens
20: grid signal receiver 21: signal detector
22: motion vector processor

Claims (1)

In the grid signal receiver for receiving the grid signal from the grid signal transmitter for generating and outputting the grid signal to detect the movement of the grid signal transmitter,
A first X detector and a second X detector, each of which detects a vertical pattern (Y-axis pattern) signal of the grating and has at least two sensors arranged horizontally;
A grating signal receiver for detecting a horizontal pattern (X-axis pattern) signal of the grating and including a first Y detector and a second Y detector in which at least two sensors are arranged vertically.

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