JP5419344B2 - Ballpoint pen with writing detection function - Google Patents

Ballpoint pen with writing detection function Download PDF

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JP5419344B2
JP5419344B2 JP2007323742A JP2007323742A JP5419344B2 JP 5419344 B2 JP5419344 B2 JP 5419344B2 JP 2007323742 A JP2007323742 A JP 2007323742A JP 2007323742 A JP2007323742 A JP 2007323742A JP 5419344 B2 JP5419344 B2 JP 5419344B2
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ballpoint pen
sensor
writing
ball
magnetic
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JP2009143144A (en
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成伸 峯
雅之 下山
広美 高橋
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三菱鉛筆株式会社
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  The present invention relates to a ballpoint pen having a function of detecting writing by detecting ball rolling (rolling) during writing.

  The following Patent Document 1 describes a two-dimensional position detection input device that detects a two-dimensional position by enclosing a magnet inside a ball and detecting a magnetic field of a rotating ball by three magnetic detection elements. . Patent Documents 2 and 3 describe an encoder that uses a ball that is equally divided into eight sections, and each section is magnetized to the north or south pole. None of these can be applied to ordinary ballpoint pens. Patent Document 4 describes an input pen consisting of a magnetized ball, a pencil-shaped case that rotatably holds the magnetized ball at the tip thereof, and three Hall elements arranged close to the magnetized ball. . In this document, the distance between each Hall element and the pole of the magnetized ball is obtained from the voltage value of each hall element, and the coordinates of the pole are calculated from these distances. Is calculated. Patent Document 5 also describes an instrument composed of a magnetized roller ball housed in a refill body and three AMR sensors arranged in a pen body that holds the refill body.

  On the other hand, although Patent Document 6 is not related to a writing instrument, the rotation of the vehicle tire is detected in the vicinity of the tire in the vehicle by utilizing the weakly magnetized steel belt of the steel radial tire. It is described that detection is performed by a highly sensitive magnetic impedance (MI) element. Specifically, the rotation of the tire is detected by differentially amplifying the detection output of a pair of MI sensors arranged so that the magnetic detection directions are parallel or on the same axis and comparing the detection output with a threshold value.

  When such a highly sensitive MI element (MI sensor) is used for a ballpoint pen, the signal changes due to the influence of an external magnetic field such as geomagnetism, and the sensor changes due to the rotation of the ball during writing. It is necessary to distinguish the change in the detection output from the change in the detection output of the sensor due to the influence of an external magnetic field such as geomagnetism that appears prominently when the ballpoint pen is held in hand.

JP-A-4-271424 JP-A-5-302836 JP-A-5-341904 JP-A-7-248875 JP 2005-50639A Patent No. 3014659

  Accordingly, it is an object of the present invention to provide a ballpoint pen having a novel configuration of a writing detection function that has high detection sensitivity and is not affected by an external magnetic field such as geomagnetism.

According to the present invention, there is provided a ballpoint pen having a writing detection function, including a replacement core having a magnetized ball and a magnetic detection unit including at least one pair of magnetic sensors arranged around the replacement core. To be
Each of the magnetic sensor pairs is preferably provided so as to sandwich the central axis of the ballpoint pen, and the magnetic sensitive directions of the magnetic sensor pairs are opposite to or in the same direction.

  More preferably, the ballpoint pen further includes a data processing unit that calculates data representing writing by the ballpoint pen based on the phase relationship and phase difference of the output signals of the magnetic sensor pairs.

In the above configuration, when a pair of magnetic sensors are arranged so that the direction of magnetic sensitivity is reversed, for example, the ballpoint pen is held in hand and the pair of magnetism is detected when the magnetic sensor detects an external magnetic field such as geomagnetism. The output signal of the sensor changes in reverse phase (phase difference 180 °). When the ball rotates with respect to the magnetic sensor by writing, it changes with the phase difference θ (0 ≦ θ ≦ θ max ), and the phase of the output signal of the rear sensor with respect to the direction of rolling of the ballpoint pen, that is, the direction of writing is It is ahead of the phase of the output signal of the front sensor. The phase difference θ is the maximum value θ max when the magnetic sensing direction of the magnetic sensor coincides with the writing direction, and is zero when the writing direction is perpendicular to the magnetic sensing direction of the sensor. When the magnetic sensor pairs are arranged in the same direction, the same phase (zero phase difference) is detected when an external magnetic field is detected, and the sensor output signal in front of the writing direction is used for writing. Is advanced by 180 ° −θ from the phase of the output signal of the rear sensor.

  Therefore, it is possible to calculate data representing the rolling of the ball, that is, writing based on the phase relationship and phase difference of the output signals of each magnetic sensor pair.

  FIG. 1 schematically shows a configuration of a ballpoint pen 10 having a function as a pointing device instead of a mouse as an example of a ballpoint pen having a writing detection function according to an embodiment of the present invention. The (a) column of FIG. 1 is a view of the ballpoint pen 10 viewed from the side of the ball 12, and the (b) column is a view of the ballpoint pen 10 viewed from the side.

  The ball 12 is magnetized and is held by a holder 14 so as to be freely rotatable. Reference numeral 16 denotes an ink tube. Around the holder 14, four MI (magnetic impedance) sensors 18, 20, 22, 24 are arranged at almost 90 ° intervals. The sensors 18 and 20 form a first pair sandwiching the central axis 26 of the ballpoint pen 10, and the sensors 22 and 24 form a second pair sandwiching the central axis 26 of the ballpoint pen 10. The magnetic sensing directions of the MI sensors in each pair are arranged so as to face each other as indicated by arrows in the drawing. You may arrange | position the magnetic sensitive direction of a sensor pair in the same direction.

  The MI sensors 18, 20, 22, 24 and the data processing unit 25 are fixed to a ballpoint pen body (not shown), and a replacement core composed of a pre-magnetized ball 12, a holder 14, and an ink tube 16 is inserted into the ballpoint pen body. Thus, the arrangement shown in FIG. 1 is obtained. The operation of magnetizing the ball 12 may be performed after the replacement core is inserted into the ballpoint pen body.

  The material of the holder 14 that holds the ball 12 is preferably a material that cannot be attracted to a magnet such as a white.

  Since FIG. 1A corresponds to a view seen from the back side of the paper when writing with the ballpoint pen 10, as shown in FIG. 1A so that the normal xy coordinates are obtained when seen from the front side of the paper. Define the x-axis and the y-axis. 2 to 5 show waveforms of output signals of the MI sensors 18, 20, 22, and 24 when written in the x direction, the -x direction, the y direction, and the -y direction, respectively. The MI sensor (manufactured by Aichi Micro Intelligent Co., Ltd.) used as the sensors 18, 20, 22, and 24 is a magnetic sensor using the magneto-impedance effect, and its magnetic resolution is 0.2 μT and the operation range is ± 200 μT. is there. The diameter of the ball 12 is φ0.7, and the magnetization strength is 21 μT. Similar results were obtained for balls of φ0.38, φ0.5, and φ1.4 with magnetization strengths of 4 μT, 8 μT, and 120 μT, respectively. Incidentally, the geomagnetism near Tokyo is about 30 μT in the horizontal direction and 35-40 μT in the vertical direction.

  2 to 5, one cycle of the output signal of each sensor corresponds to one rotation of the ball 12. As can be seen from FIG. 2, when writing is performed in the x-axis direction from the sensor 24 to the sensor 22, signals in the same phase are output from the sensor pairs 18 and 20 arranged in a direction perpendicular to the writing direction. From the sensor pairs 22 and 24 arranged in the writing direction, a signal of the phase difference θ is output. The phase of the output signal of the sensor 24 arranged rearward in the writing direction is advanced by θ relative to the output signal of the sensor 22 arranged forward. When writing is performed in the −x direction in FIG. 3, the phase relationship between the output signals of the sensor 22 and the sensor 24 is reversed as compared with FIG. 2. When writing in the y direction in FIG. 4, the output signals from the sensor pairs 22 and 24 arranged in a direction perpendicular to the writing direction are in phase, and the output signal of the sensor 18 arranged rearward in the writing direction. Is advanced in phase by θ relative to the output signal of the sensor 20 arranged in front. When writing is performed in the -y direction in FIG. 5, the phase relationship between the output signals of the sensor 18 and the sensor 20 is reversed as compared with FIG.

  It has been found that the phase difference θ of the output signals of each sensor pair decreases as the angle formed by the writing direction and the magnetic sensing direction of the sensor increases, and increases as the angle formed by both decreases. It has also been found that the phase difference θ depends only on the writing direction and does not depend on the writing speed.

On the other hand, when an external magnetic field is detected, the magnetic sensing direction of the sensor pair is opposite, so the output signal of the sensor pair changes in the opposite phase (phase difference 180 °). Can be determined. When the sensor pairs are arranged in the same direction, the phase difference during writing is 180 ° −θ (0 ≦ θ ≦ θ max ), and the phase difference is zero when the ballpoint pen is shaken by hand. It becomes.

  In any case, the direction of writing can be detected by detecting the phase difference of the output signals of the sensor pair or the amount of phase corresponding to the phase difference and the phase relationship between the phases. In addition, with the arrangement as shown in FIG. 1, the data processing unit 25 calculates data indicating the phase difference of the output signals of the sensor pairs 22 and 24 arranged in the x-axis direction and the phase relationship. To obtain the component Δx in the x-axis direction of the writing, and calculate the phase difference between the output signals of the sensor pairs 18 and 20 arranged in the y-axis direction and the data indicating the phase relationship of the writing by calculating the y-axis of the writing A direction component Δy is obtained. By connecting these to the input of a pointing device such as a mouse input of a computer, the ballpoint pen 10 can be used as a pointing device instead of a mouse.

As the data indicating the phase difference of the output signal of the sensor pair and the phase relationship of the phases used as the components Δx and Δy of each axis, for example, as shown in FIG. The time from the minimum value) to the maximum value (or minimum value) of the delayed phase signal is a, and from the maximum value (or minimum value) of the delayed phase signal to the minimum value (or maximum value) of the advanced phase signal When time is b, when the phase of the signal from the sensor 24 arranged rearward in the x-axis direction is ahead of the phase of the signal from the sensor 22 arranged forward in the x-axis direction, the sensor pair 22, 24 From the values of a x and b x obtained from the output signal of
Δx = a x / (a x + b x ) (1)
Δx is calculated by the following equation, and when the phase of the output signal of the sensor 22 is advanced, Δx is expressed by the equation: Δx = −a x / (a x + b x ) (2)
Calculate with When the phase of the output signal of the sensor 18 arranged in the y-axis direction is ahead of the phase of the output signal of the sensor 20 arranged in front of the y-axis, a y obtained from the output signals of the sensor pairs 18 and 20 , the value of b y, wherein
Δy = a y / (a y + b y) (3)
In calculates the [Delta] y, when the phase of the output signal of the sensor 20 is advanced, the formula Δy = -a y / (a y + b y) (4)
To calculate Δy. Incidentally, a x / (a x + b x), a y / (a y + b y) instead of a x / b x of, may be used a y / b y becomes susceptible to velocity changes.

More specifically, when the x-axis component Δx of writing is positive, as shown in FIG. 1A, the phase of the output signal from the sensor 24 located rearward in the x-axis direction is the sensor located forward. Since it is ahead of the phase of the output signal from 22, it is shown in the (a) and (b) columns of FIG.
Pattern P 1 + : Maximum of sensor 24 → Maximum of sensor 22 → Minimum of sensor 24
Pattern P 2 + : Two patterns of minimum of sensor 24 → minimum of sensor 22 → maximum of sensor 24 appear alternately. When the x-axis component Δx of writing is negative, it is shown in the columns (c) and (d) of FIG.
Pattern P 1 : Maximum of sensor 22 → Maximum of sensor 24 → Minimum of sensor 22
Pattern P 2 : Two patterns of the minimum of the sensor 22 → the minimum of the sensor 24 → the maximum of the sensor 22 appear alternately.

Therefore, the maximum and minimum of the output signals of the sensor pairs 22 and 24 are continuously detected, and the detection time T i is stored in time series every time the maximum or minimum of any one of the sensor output signals is detected, It is determined whether the latest three maximum / minimum detection results coincide with any of the above P 1 + , P 2 + , P 1 or P 2 . And when it matches the pattern P 1 + or P 2 + , Δx = (T i-1 -T i-2 ) / (T i -T i-2 ) (5)
Calculating a [Delta] x, the pattern P 1 - [Delta] x = time consistent with - - or P 2 (T i-1 -T i-2) / (T i -T i-2) (6)
To calculate Δx. The same applies to Δy. As a result, the values of Δx and Δy can be obtained for each half cycle of the sensor output signal.

  Regarding the detection of the maximum and minimum of the output signal of the sensor, for example, the rising pattern and the falling pattern of the signal are detected, and the rising pattern is detected from the previous state where either the rising pattern is detected or not is detected. It is assumed that the maximum detection is performed at the time of turning to, and the minimum detection is that the rising pattern is detected this time from the previous time when the falling pattern is detected or none is detected.

  Regarding the detection of the ascending / descending pattern, for example, when rising continuously n times (for example, n = 3), the rising pattern is detected, and when falling continuously n times, the falling pattern is detected. Alternatively, the rising pattern may be detected when m (for example, n = 5, m = 4) rises out of n consecutive times, and the falling pattern may be detected when the number rises m times.

Further, instead of storing the time T i at the time of detecting the maximum or minimum, the elapsed time ΔT i (= T i −T i−1 ) from the previous detection may be measured by a timer and stored. good. In this case,
Δx = ΔT i-1 / (ΔT i + ΔT i-1 ) (when P 1 + and P 2 + ) (7)
Or Δx = −ΔT i-1 / (ΔT i + ΔT i-1 ) (when P 1 , P 2 ) (8)
To calculate Δx.

  FIG. 8 is a flowchart showing an example of the calculation process of Δx executed in the data processing unit 25 in accordance with the above procedure.

First, the current state (up / down / neither) of the sensors 22, 24 is detected from the A / D conversion results of the outputs of the current sensors 22, 24 and their past history (step 1000), Store (step 1002). Next, the current state is compared with the previous state to detect the local maximum / minimum of the outputs of the sensors 22 and 24 (step 1004). When the local maximum / minimum is not detected (step 1006), Δx is set to zero. (Step 1014), the process returns to Step 1000. When maximum / minimum is detected (step 1006), the value of the timer at that time is stored as ΔT i and the timer is restarted from zero (step 1008). Next, it is determined whether the maximum / minimum detection histories of the outputs of the sensors 22 and 24 match any of the patterns P 1 + , P 2 + , P 1 , P 2 (step 1010). When (step 1012), Δx is set to zero (step 1014), and the process returns to step 1000. When it coincides with either one (step 1012), Δx is calculated by equation (7) or equation (8) according to the coincident pattern (step 1016). When the calculated value of Δx is larger than the maximum value Δx max (step 1018), it is determined that the change is not caused by the rotation of the ball, and Δx is set to zero (step 1020). In either case, the process returns to step 1000 and the processes in and after step 1000 are repeated at regular intervals.

Since the calculation of Δy is similar to this, the description is omitted.
In the above method, in step 1018, it is determined whether writing is in progress, that is, whether the ball is rotating.
Δx> Δx max
It is done by. Alternatively, it may be determined that writing is in progress when the differential signal of the output signal of the sensor pair changes with a predetermined amplitude or more. This is because the output signal of the sensor pair changes in the opposite phase when not writing, and the amplitude of the differential signal is small, and when writing, it changes with a predetermined amplitude or more. That is, as shown in FIG. 9, when a maximum / minimum is detected (step 1006) and ΔT i is stored, the value (differential) i of the differential signal is also stored (step 1008 ′). In step 1018 '
| (Differential) i- (differential) i-1 |> C 1 or | (differential) i- (differential) i-2 |> C 2
If not, it is determined that writing is in progress, and if not, it is determined that writing is not in progress and Δx = 0 is set (step 1020). C 1 and C 2 are experimentally determined constants.

Instead of calculating Δx (and Δy) by the above formulas (1) to (6), if calculated by the following formula, the x component (and y of the actual moving distance) for each half cycle of the rotation of the ball 12 Component), the actual moving distance and direction on the two-dimensional plane can be known.
Δx = (d x / d x, max ) × B × (π / 4) / C (9)
Δy = (d y / d y, max ) × B × (π / 4) / C (10)
(9) (10) where, d x and d y is a value of Δx and Δy are obtained by the respective formulas (1) ~ (4), d x, max and d y, max respectively x and y the maximum value of d x and d y are obtained when writing in the axial direction, B is the diameter of the ball 12, C is the actual relative rotational speed of the ball in the absence of slip during the rotation rate (writing ballpoint pen The ratio of rotation speed).

As shown in FIG. 10, when the angle formed by the two straight lines 30 and 32 from the ball 12 to the sensor pair 24 and 22 (18 and 20) is ψ, the maximum phase difference, that is, the magnetic sensing direction of the sensor pair. 11 and the phase difference θ max of the output signal of the sensor pair when written in parallel therewith, there is a correlation as shown in FIG. 11, and as ψ increases, that is, the closer the sensor is to the ball, the larger the signal amplitude becomes. Not only the detection sensitivity is increased, but also the signal phase difference is increased, so that the accuracy is improved. However, when ψ approaches 180 °, the maximum phase difference θ max also approaches 180 °, making it difficult to distinguish it from the phase difference of 180 ° when the ball does not rotate. In this case, the sensor is positioned around the ball, and it is difficult to physically arrange the sensor.

Conversely, when the sensor is arranged away from the ball as shown in FIG. 12, the signal amplitude is reduced and the maximum phase difference is also reduced as shown in FIG. In this case, as shown in FIG. 14, the amplitude of the signal and the maximum phase difference are increased by sticking a yoke film 34 in the region between the sensor and the ball 12 on the surface of the holder 14. Can do. FIG. 15 shows the waveform of the output signal of the sensor when the yoke film 34 is pasted only in the writing direction for comparison. As described above, the maximum phase difference is reduced when the sensor is separated from the ball, but it has been found that the phase relationship is reversed when the sensor is further separated.

When the holder 14 is magnetized, the signal at the time of writing becomes the same phase for the sensor pair arranged in the writing direction, so the direction of writing cannot be known. Therefore, as the material of the holder 14, as described above, a material that cannot be attracted to a magnet such as white and white is preferable. However, even a material attracted to a magnet such as stainless steel can be used because an appropriate phase difference can be obtained as shown in FIG. 16 if it is not magnetized. Further, in the case where the white surface is plated, if it is magnetized even if it is magnetized, there is an appropriate phase difference as shown in FIG. 17 if it is not magnetized as a whole. Since it is obtained, it can be used.
As for the arrangement of the two magnetic sensors constituting the sensor pair, as shown in FIG. 1, when the arrangement is such that the magnetic sensing direction is reversed across the central axis 26 of the ballpoint pen 10, as shown in FIG. Thus, when writing in a direction parallel to the magnetic sensing direction of the sensor indicated by the arrow 40, the phase difference of the output signal of the sensor pair becomes the maximum, and when writing in a direction perpendicular to the magnetic sensing direction of the sensor indicated by the arrow 42, the minimum It becomes.
More generally, as shown in FIG. 19, when the two magnetic sensors 22 (18) and 24 (18) are arranged at the central angle ρ (0 <ρ ≦ 180 °), the center indicated by the arrow 46 is shown. It has been found that if the angle ρ is written in a bisection direction, the phase difference of the signal becomes 0, and if written in the direction perpendicular to this, indicated by the arrow 44, the phase difference of the signal becomes maximum. Accordingly, the arrangement of the two magnetic sensors constituting the sensor pair can detect the writing direction or the like even if the central angle ρ is not 180 ° as shown in FIG. It is possible to detect the writing direction and the like by arranging the central angle 120 ° and analyzing two or three pairs of output signals therefrom. However, in this case, it cannot be distinguished from the external magnetic field detected by the magnetic sensor when, for example, the pen is held and shaken, and it is necessary to detect this by another means.
The ballpoint pen having the writing detection function described so far has a configuration composed of a replacement pen (refill) and a ballpoint pen body in which a replacement sensor is inserted and a magnetic sensor is arranged in the same manner as a normal ballpoint pen. It is easy, and it is advantageous in terms of cost because it can be used again if the refill is replaced when the ink runs out.

  The ballpoint pen having a writing detection function of the present invention can be used as an authentication tool because it can directly input a handwriting written on a paper with a ballpoint pen to a computer in addition to the above-described pointing device. . Moreover, it is possible to use as a penmanship practice tool by evaluating characters written with reference to a character pattern as a model.

It is a figure which shows an example of the ball-point pen which has a writing detection function based on one Example of this invention. It is a graph which shows the waveform of the output signal of each sensor at the time of writing in the x direction of FIG. It is a graph which shows the waveform of the output signal of each sensor at the time of writing in the -x direction of FIG. It is a graph which shows the waveform of the output signal of each sensor at the time of writing in the y direction of FIG. It is a graph which shows the waveform of the output signal of each sensor at the time of writing in the -y direction of FIG. It is a figure for demonstrating calculation of the data which shows the phase difference of the output signal of a sensor pair, and the phase relationship. It is a figure which shows four maximum and minimum patterns for detecting the phase difference of the output signal of a sensor pair, and the phase context. It is a flowchart which shows an example of (DELTA) x calculating process in the data processing part 25 of FIG. It is a flowchart which shows the other example of (DELTA) x arithmetic processing. It is a figure for demonstrating the sensor installation angle (psi). It is a graph of the experimental result which shows the correlation with sensor installation angle (psi) and maximum phase difference (theta) max . It is a figure which shows the example which installs a sensor away from a ball | bowl. It is a graph which shows the waveform of the output signal of each sensor in the case of FIG. It is a figure which shows the example which affixed the yoke film | membrane. It is a graph which shows the waveform of the output signal of each sensor in the case of FIG. It is a graph which shows the waveform of the output signal of each sensor at the time of using the stainless steel which is not magnetized for the material of a holder. It is a graph which shows the waveform of the output signal of each sensor at the time of magnetizing only the surface of a holder. It is a figure explaining the relationship between arrangement | positioning of a magnetic sensor, and the phase difference of a signal. It is a figure explaining the relationship between arrangement | positioning of a magnetic sensor, and the phase difference of a signal.

Claims (8)

  1. A replacement core having a magnetized ball;
    A ballpoint pen having a writing detection function, comprising: a magnetic detection unit including two pairs of magnetic sensors arranged at intervals of approximately 90 ° around the central axis of the replacement core.
  2.   2. The ballpoint pen according to claim 1, wherein each of the magnetic sensor pairs is provided so as to sandwich a central axis of the ballpoint pen, and the magnetic sensitive directions of the magnetic sensor pairs are arranged in opposite directions or in the same direction.
  3.   3. The ballpoint pen according to claim 1, further comprising a data processing unit that calculates data representing writing with the ballpoint pen based on the phase relationship and phase difference of the output signals of each magnetic sensor pair.
  4.   4. The ballpoint pen according to claim 3, wherein the replacement core has a holder that is rotatably held as a whole and that rotatably holds the magnetized ball.
  5. The ballpoint pen according to claim 4 , wherein the data processing unit calculates and outputs data that can be used as a pointing device of a computer.
  6. The ballpoint pen according to claim 4 , wherein the data processing unit calculates and outputs data indicating a component of the movement distance of the ballpoint pen in each of two orthogonal axes.
  7. The data processing unit detects the maximum and minimum of the output signal of each magnetic sensor by detecting the rising pattern and the falling pattern of the output signal of each magnetic sensor, and thereby the phase of the output signal of each magnetic sensor pair The ballpoint pen according to any one of claims 3 to 6 , wherein a front-rear relationship and a phase difference are detected.
  8. The ballpoint pen according to any one of claims 1 to 7 , further comprising a yoke film provided in a region between the magnetic sensor pair and the ball on a surface of the holder for holding the ball.
JP2007323742A 2007-12-14 2007-12-14 Ballpoint pen with writing detection function Expired - Fee Related JP5419344B2 (en)

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