KR-20260063822-A - A smart pen that can acquire more accurate coordinates
Abstract
In the case of a smart pen, when a photocoordinate sensor is fixed to the smart pen to recognize coordinates, the coordinate distortion is severe due to light reflection and diffuse reflection caused by the tilt of the pen, which causes significant impediments to its function as a mouse and pen. To prevent this, a smart pen is disclosed that can acquire more accurate coordinates by using a gyroscope sensor and a motor in the smart pen so that the photocoordinate sensor always maintains a horizontal position relative to the ground and can acquire accurate 2D coordinates.
Inventors
- 유승범
- 한기열
Assignees
- 캐논코리아 주식회사
Dates
- Publication Date
- 20260507
- Application Date
- 20241031
Claims (1)
- Regarding smart pens A device that enables accurate coordinate reading by using a small motor to keep the optical coordinate sensor always horizontal with the ground using the coordinate angle input from a gyroscope sensor, thereby preventing diffuse reflection and insufficient light from the optical coordinate sensor.
Description
A smart pen that can acquire more accurate coordinates The present invention relates to a smart pen capable of acquiring more accurate coordinates, and more specifically, to a smart pen capable of acquiring more accurate coordinates by using a gyroscope sensor and a motor in the smart pen so that the optical coordinate sensor always maintains a horizontal position relative to the ground to acquire accurate two-dimensional coordinates. Conventional smart pens use a method of correcting coordinates by utilizing the reflection of an optical sensor. However, this method may result in measurements that deviate from the actual coordinates due to diffuse reflection from the surface or differences in the return time or angle when the pen is tilted. Fig. 1: When the optical coordinate sensor is fixed in the vertical direction of the pen Fig. 2: Simplified diagram of the method for an optical coordinate sensor to maintain horizontal alignment with the ground in the direction of pen operation. Fig. 3: Coordinate acquisition process Fig. 4: Horizontal Sequence Fig. 5: Reference diagram for leveling Fig. 6: Sequence calculation formula for coordinate extraction Fig. 7: Detailed drawing of the leveling device Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention, parts unrelated to the explanation have been omitted from the drawings. Furthermore, when it is stated that a part “includes” or “is equipped” with a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. As described above, since it is difficult to obtain accurate x and y coordinates from a fixed optical coordinate sensor for mouse and pen functions in a smart pen, the present invention obtains an angle θ through acceleration obtained by a gyroscope sensor and extracts x and y coordinates by maintaining the optical coordinate sensor horizontally with the ground through a motor. As a means to solve the aforementioned technical problem, when the optical coordinate sensor is perpendicular to the floor as shown in FIG. 6, the coordinate sensor is positioned perpendicular to the ground to read the coordinates. That is, to obtain the pitch angle, the acceleration for each direction is calculated as in the software calculation formula below to obtain the pitch angle, and the pitch angle is maintained horizontally so that it is always 0. As shown in Fig. 7, a small screw motor, a semicircular gear (with a device attached to fix the flexible circuit board), and a light sensor and a gyro sensor mounted on a double-sided flexible circuit board are attached to the semicircular gear so that the light sensor is always horizontal with respect to the ground. Specific embodiments have been illustrated and described above. However, the invention is not limited to the embodiments described above, and those skilled in the art may make various modifications without departing from the essence of the technical concept of the invention as described in the following claims.