TWI441047B - Sensing system - Google Patents

Description

Sensing system

The present invention relates to a sensing system, and more particularly to a sensing system having a reflective element.

A touch system has been disclosed in a number of related patents, such as U.S. Patent Nos. 4,782,328 and 6,803,906. The touch systems disclosed in the above two patents each require at least two sensors, so that the touch system disclosed in each of the above patents has a high cost of production. The following will be explained in one of the above two patents.

Please refer to FIG. 1 , which illustrates a schematic diagram of a conventional touch screen system. The touch screen system 100 disclosed in U.S. Patent No. 4,782,328 includes a panel 110, a first photosensor 120, and a second photosensor 130. A processor 140. The panel 110 has a touch screen area 112 having a rectangular shape. The first photo sensor 120 and the second photo sensor 130 are disposed at opposite ends of one of the boundaries 112 a of the touch screen area 112 , and the first photo sensor 120 and the second photo sensor 130 The sensing range covers the touch screen area 112, respectively. In addition, the first photo sensor 120 and the second photo sensor 130 are electrically connected to the processor 140 .

When a pointer 150 touches the touch screen area 112, the first light sensor 120 and the second light sensor 130 respectively follow a first sensing path 162 and a first The second sensing route 164 senses the indicator 150. The processor 140 calculates the location of the indicator 150 based on the first sensing route 162 and the second sensing route 164.

However, the conventional touch screen system 100 must have two photo sensors 120 and 130. Therefore, the conventional touch screen system 100 has a high production cost.

The present invention provides a sensing system that is less expensive to produce.

The present invention provides a sensing system adapted to sense an indicator and calculate the position of the indicator. The sensing system includes a panel, a reflective component, an image sensor and a processor. The panel has a first plane and a first area located in the first plane. The first area has a quadrangular shape and has a first side, a second side, a third side and a fourth side connected in sequence. The reflective element is disposed on the first side and on the first plane. One of the second elements of the reflective element is substantially perpendicular to the first plane, the second plane is a reflective mirror plane, and the second plane mirrors the first area to form a second area. The image sensor is disposed at a corner intersecting the third side and the fourth side and is located on the first plane. The sensing range of the image sensor covers the first area and the second area. The processor is electrically connected to the image sensor.

When the pointer is adjacent to the first area, and the indicator forms a first mirror image with respect to the reflective element such that the indicator and the first image are within the sensing range of the image sensor, and when the indicator is adjacent When a portion of the first region, a portion of the first image adjacent to the second region is not collinear with the image sensor, the image sensor senses the indicator and the first image, and the processor calculates the location of the pointer.

In an embodiment of the invention, the image sensor senses the indicator along a first sensing route and senses the first image along a second sensing route, and the processor is configured according to the first sensing. The route and the second sensing route calculate the location of the indicator.

In an embodiment of the invention, the shape of the first region is rectangular. The processor has information of a first distance "D1" from the first side and the third side, and the processor calculates the position of the pointer including the following steps. First, a first angle "A1" between the first sensing route and the third side is determined. Next, a second angle "A2" between the second sensing route and the third side is determined. Next, the doubled D1 is divided by the sum of tanA1 and tanA2 to calculate a second distance "D2" from which the pointer is spaced from the fourth side.

In an embodiment of the invention, the sensing system further includes a first linear light source and a second linear light source. The first linear light source is disposed on the second side and is located on the first plane, and the first linear light source forms a second mirror image with respect to the reflective element. The second linear light source is disposed on the third side and on the first plane, and the second linear light source forms a third image with respect to the reflective element. The fourth side forms a fourth image with respect to the reflective element. The reflective element, the first linear light source, the second linear light source, and the fourth side surround the first region. The reflective element, the second mirror image, the third mirror image, and the fourth mirror image surround the second region. The first linear light source, the second mirror image and the third mirror image are located within the sensing range of the image sensor.

In an embodiment of the invention, the sensing system further includes a first light source, a first reflector and a second reflector. The first light source is located next to the image sensor. The first reflector is disposed on the second side and is located on the first plane. The first reflector forms a second image with respect to the reflective element. The first reflector has a first retro-reflective surface, and the first retroreflective surface is adapted to reflect the light emitted by the first source. The second reflector is disposed on the third side and is located on the first plane. The second reflector forms a third mirror image with respect to the reflective element. The second reflector has a second retroreflective surface, and the second retroreflective surface is adapted to reflect the light emitted by the first source. The fourth side forms a fourth image with respect to the reflective element. The reflective element, the first reflector, the second reflector, and the fourth side surround the first region. The reflective element, the second mirror image, the third mirror image, and the fourth mirror image surround the second region. The first reflector, the second mirror image and the third mirror image are located within the sensing range of the image sensor. Furthermore, the first light source is adapted to emit invisible light. The image sensor has an image-sensing window and a filter. The filter is placed before the image sensing window, and the filter filters light other than invisible light to pass the invisible light through the filter. In addition, the first light source is an infrared light emitting diode (IR LED), and the filter is an infrared light filter (IR-pass filter).

In an embodiment of the invention, the shape of the first region is a non-rectangular quadrilateral. In addition, the processor has a first distance "D3" from the first edge of the first imaginary line passing through the corner and parallel to the first side, and the processor calculates the position of the pointer including the following steps . First, the first angle "A3" between the first sensing route and the first imaginary line is determined. Next, the second angle "A4" between the second sensing route and the first imaginary line is determined. Next, the doubled D3 is divided by the sum of tanA3 and tanA4 to calculate a second distance "D4" from the second imaginary line passing through the corner and perpendicular to the first side.

In an embodiment of the invention, the sensing system further includes a first linear light source, a second linear light source and a third linear light source. The first linear light source is disposed on the second side and is located on the first plane, and the first linear light source forms a second mirror image with respect to the reflective element. The second linear light source is disposed on the third side and on the first plane, and the second linear light source forms a third image with respect to the reflective element. The third linear light source is disposed on the fourth side and on the first plane, and the third linear light source forms a fourth image with respect to the reflective element. The reflective element, the first linear light source, the second linear light source, and the third linear light source surround the first region. The reflective element, the second mirror image, the third mirror image, and the fourth mirror image surround the second region. The first linear light source, the second mirror image, the third mirror image, and the fourth mirror image are located within the sensing range of the image sensor.

In an embodiment of the invention, the sensing system further includes a first light source, a first reflector, a second reflector, and a third reflector. The first light source is located next to the image sensor. The first reflector is disposed on the second side and is located on the first plane. The first reflector forms a second image with respect to the reflective element. The first reflector has a first retroreflective surface, and the first retroreflective surface is adapted to reflect the light emitted by the first source. The second reflector is disposed on the third side and is located on the first plane. The second reflector forms a third mirror image with respect to the reflective element. The second reflector has a second retroreflective surface, and the second retroreflective surface is adapted to reflect the light emitted by the first source. The third reflector is disposed on the fourth side and is located on the first plane. The third reflector forms a fourth image with respect to the reflective element. The third reflector has a third retroreflective surface, and the third retroreflective surface is adapted to reflect the light emitted by the first source. The reflective element, the first reflector, the second reflector, and the third reflector surround the first region. The reflective element, the second mirror image, the third mirror image, and the fourth mirror image surround the second region. The first reflector, the second mirror image, the third mirror image, and the fourth mirror image are located within the sensing range of the image sensor. Furthermore, the first light source is adapted to emit invisible light. The image sensor has an image sensing window and a filter. The filter is placed before the image sensing window, and the filter filters light other than invisible light to pass the invisible light through the filter. In addition, the first light source is an infrared light emitting diode, and the filter is an infrared light pass filter.

In an embodiment of the invention, the sensing system further includes a first light source disposed above the first plane and outside the first area. The first source forms a second image with respect to the reflective element. The first light source and the second image are located outside the sensing range of the image sensor. The indicator has a reflective surface. The first light source is adapted to emit invisible light, and the first image is formed by the first light source illuminating the reflective surface of the indicator.

In an embodiment of the invention, the indicator has a light emitting device. The first image is formed by the light emitted by the illumination device.

In an embodiment of the invention, when the indicator is adjacent to the first area, and the indicator forms a first image with respect to the reflective element such that the indicator and the first image are within the sensing range of the image sensor, and when The image sensor senses the size of the indicator along a third sensing path when the portion of the indicator adjacent to the first region and the portion of the first mirror adjacent to the second region are collinear with the image sensor. The processor has information on the correspondence between the size of the indicator of the third sensing route and the length of the third distance "D5" of the pointer from the corner, and the processor calculates the position of the pointer according to the size of the indicator.

The processor of the sensing system of an embodiment of the present invention is capable of calculating the location of the pointer by the configuration of the reflective element and the image sensor. Therefore, compared with the prior art, the sensing system of the embodiment can adopt an image sensor, so that the production cost of the sensing system of the embodiment is low.

The above described features and advantages of the present invention will be more apparent from the following description.

[First Embodiment]

2 is a perspective view of a sensing system according to a first embodiment of the present invention, and FIG. 3 is a schematic top view of the sensing system of FIG. Referring to Figures 2 and 3, the sensing system 200 is adapted to sense an indicator 270 and calculate the position of the indicator 270 (see below). The sensing system 200 includes a panel 210, a reflective component 220, a first linear light source 230, a second linear light source 240, an image sensor 250, and a processor 260. The panel 210 is, for example, a whiteboard or a touch screen having a first plane 214 and a first region 212 on the first plane 214. The first region 212 has a quadrangular shape, which is, for example, a rectangle, and the first region 212 has a first side 212a, a second side 212b, a third side 212c and a fourth side 212d.

The reflective element 220 is disposed on the first side 212a and on the first plane 214. The second plane 222 of one of the reflective elements 220 is substantially perpendicular to the first plane 214, the second plane 222 is a specularly reflective surface, and the second plane 222 reflects the first region 212 to form a second region 212'. The reflective element 220 is, for example, a plane mirror, but is not limited thereto. The first linear light source 230 is disposed on the second side 212b and on the first plane 214, and the first linear light source 230 forms a second mirror image 230' with respect to the reflective element 220.

The second linear light source 240 is disposed on the third side 212c and on the first plane 214, and the second linear light source 240 forms a third mirror image 240' with respect to the reflective element 220. The fourth side 212d forms a fourth mirror image 212d' with respect to the reflective element 220. The reflective element 220, the first linear light source 230, the second linear light source 240, and the fourth side 212d surround a first region 212. The reflective element 220, the second mirror image 230', the third mirror image 240' and the fourth mirror image 212d' surround a second region 212'.

The image sensor 250 is disposed on a corner C1 of the third side 212c and the fourth side 212d and is located on the first plane 214. The sensing range of the image sensor 250 covers the first area 212 and the second area 212'. . The first linear light source 230, the second image 230', and the third image 240' are located within the sensing range of the image sensor 250. In addition, the processor 260 is electrically connected to the image sensor 250.

The mode of operation of the sensing system 200 of the present embodiment will be described below. 4 is a schematic diagram of the processor of FIG. 3 for calculating the position of the pointer, and FIG. 5 is a schematic diagram of the image sensing window of the image sensor of FIG. 3. Referring to FIG. 3, FIG. 4 and FIG. 5, when the indicator 270 (see FIG. 2) is adjacent to the first area 212, and the indicator 270 forms a first image 270' with respect to the reflective element 220, such that the indicator 270 and the A mirror image 270' is located within the sensing range of the image sensor 250, and when the pointer 270 is adjacent to a portion of the first region 212, a portion of the first image 270' adjacent to the second region 212' and the image sensor When 250 is not collinear, image sensor 250 senses indicator 270 and first image 270', and processor 260 calculates the location of indicator 270. In other words, the image sensor 250 of the present embodiment senses the indicator 270 along a first sensing route 282 and senses the first image 270 ′ along a second sensing route 284, and the processor 260 according to the first A sense route 282 and a second sense route 284 calculate the location of the indicator 270.

It should be noted that in the present embodiment, the portion of the indicator 270 adjacent to the first region 212 is a tip 272 of the indicator 270 (see FIG. 2), and the second region 212 of the first mirror 270' is adjacent. That part of 'the tip 272' is one of the first mirrors 270'.

In detail, in the embodiment, the image sensor 250 has an image sensing window 252 and a lens (not shown). The lens is disposed in front of the image sensing window 252 such that the image sensing range of the image sensor 250 covers the first region 212 and the second region 212'. When the indicator 270 is not adjacent to the first area 212, the light emitted by the first linear light source 230, the second image 230', and the third image 240' may form a higher brightness on the image sensing window 252. The bright zone 254, which is the primary sensing zone. When the indicator 270 is adjacent to the first area 212, the image sensor 250 senses the indicator 270 along the first sensing path 282, and a bright line 254 on the image sensing window 252 exhibits a first dark line (obscure strip) 252a, and the image sensor 250 outputs a first electrical signal. The processor 260 receives the first electrical signal and determines a first angle A1 between the first sensing route 282 and the third side 212c according to the position of the first dark line 252a on the image sensing window 252. In other words, the processor 260 can have the information of the correspondence between the position on the image sensing window 252 and the angle between the sensing route and the third side 212c in a built-in manner, so that the above determination is made. The work of an angle A1 is carried out.

Similarly, the image sensor 250 senses the first image 270 ′ along the second sensing path 284 , and the bright area 254 on the image sensing window 252 has a second dark line 252 b , and the image sensor 250 outputs A second electrical signal. The processor 260 receives the second electrical signal and determines a second angle A2 between the second sensing route 284 and the third side 212c according to the position of the second dark line 252b on the image sensing window 252. It should be noted that the stronger the brightness of the first linear light source 230 and the second linear light source 240, the more obvious the first dark line 252a and the second dark line 252b on the image sensing window 252.

In addition, the processor 260 can have information of a first distance D1 from the first side 212a and the third side 212c by a built-in method. In the present embodiment, the third side 212c is the X-axis of the Cartesian coordinate system, the fourth side 212d is the Y-axis of the Cartesian coordinate system, and the coordinates of the corner C1 are (0, 0). The X coordinate of the indicator 270 is a second distance D2 between the pointer 270 and the fourth side 212d, and the point of the indicator 270 and the first mirror 270' is located on the first side 212a, so D1 is equal to (D2. tanA1+D2.tanA2)/2. Thus, processor 260 can divide twice the D1 by the sum of tanA1 and tanA2 to calculate a second distance D2 from which indicator 270 is spaced from fourth edge 212d. In other words, the coordinates (D2, D2.tanA1) of the pointer 270 can be found by the above calculation method. It should be noted that the calculation method of the coordinates of the indicator 270 in the rectangular coordinate system is used as an example. The coordinate system of the indicator can be used by the designer to calculate the coordinates of the indicator according to the design requirements, and the present invention is not limited thereto.

By the configuration of the reflective component 220 and the image sensor 250, the processor 260 of the sensing system 200 of the present embodiment can calculate the location of the pointer 270. Therefore, compared with the prior art, the sensing system 200 of the present embodiment can employ an image sensor 250, so that the sensing system 200 of the embodiment has a lower production cost.

[Second embodiment]

6 is a top plan view showing the operation of a sensing system according to a second embodiment of the present invention. FIG. 7 is a schematic diagram of the processor of FIG. 6 calculating the position of the pointer. Referring to FIG. 6 and FIG. 7 , the sensing system 300 of the present embodiment is different from the sensing system 200 of the first embodiment in that the sensing system 300 further includes a third linear light source 390 and is located in the panel 310 . The shape of the first region 312 at the first plane 314 is a non-rectangular quadrilateral.

The third linear light source 390 is disposed on the fourth side 312d of the first region 312, and the third linear light source 390 forms a fourth mirror image 390' with respect to the reflective element 320. The reflective element 320 (disposed on the first side 312a of the first region 312), the first linear light source 330 (disposed on the second side 312b of the first region 312), and the second linear light source 340 (disposed in the first region 312) The third side 312c) surrounds the first region 312 with the third linear light source 390.

The reflective element 320, the first linear light source 330 is formed with respect to the second mirror image 330' formed by the reflective element 320, and the second linear light source 340 is formed around the third mirror image 340' and the fourth mirror image 390' formed by the reflective element 320. Two areas 312'. In addition, the image sensor 350 is disposed at a corner C2 where the third side 312c and the fourth side 312d intersect, and the sensing range of the image sensor 350 covers the first area 312 and the second area 312'. The first linear light source 330, the second image 330', the third image 340', and the fourth image 390' are located within the sensing range of the image sensor 350. Additionally, indicator 370 forms a first image 370' with respect to reflective element 320.

The mode of operation of the sensing system 300 of the present embodiment will be described below. In the present embodiment, the first imaginary line L1 passing through the corner C2 and parallel to the first side 312a is the X-axis of the rectangular coordinate system, and the second imaginary line L2 passing through the corner C2 and perpendicular to the first side 312a is used as the rectangular coordinate system. The Y axis, and the coordinates of the corner C2 are (0, 0). The processor 360 can have information of the first distance D3 of the first imaginary line L1 and the first side 312a by a built-in method.

When the indicator 370 is adjacent to the first region 312 and the indicator 370 forms a first image 370 ′ with respect to the reflective element 320 such that the indicator 370 and the first image 370 ′ are within the sensing range of the image sensor 350 , and When a portion of the indicator 370 adjacent to the first region 312, a portion of the first image 370 ′ adjacent to the second region 312 ′ is not collinear with the image sensor 350 , the image sensor 350 first along the first sensing Route 382 senses indicator 370 and senses first image 370' along second sensed route 384. Next, the processor 360 determines a first angle A3 between the first sensing route 382 and the first imaginary line L1 according to the first sensing route 382 and the second sensing route 384, and the second sensing route 384 and the first A second angle A4 between imaginary lines L1. Processor 360 then divides the doubled D3 by the sum of tanA3 and tanA4 to calculate a second distance D4 from which the second imaginary line L2 is spaced from the indicator 370. Therefore, the coordinates (D4, D4.tanA3) of the indicator 370 can be found by the above calculation method.

It should be noted that the manner of the sensing manner of the image sensor 350 of the embodiment and the manner of determining the angle of the processor 360 may be referred to the related description of the first embodiment, and thus will not be further described herein.

8 is another schematic diagram of the processor of FIG. 6 for calculating the position of the pointer, and FIG. 9 is a schematic diagram of the image sensing window of the image sensor of FIG. 6. Referring to FIG. 6 , FIG. 8 and FIG. 9 , in the embodiment, when the indicator 370 is not adjacent to the first region 312 , the first linear light source 330 , the second mirror image 330 ′, and the third image 340 ′′ The light emitted by the four mirrors 390' will form a brighter region 354 with a higher brightness on the image sensing window 352 (see also FIG. 6), which is the main sensing block. When the portion of the indicator 370 adjacent to the first region 312 and the portion of the first mirror 370' adjacent to the second region 312' are collinear with the image sensor 350, the image sensor 350 follows a third sense The route 386 (i.e., the second imaginary line L2) senses the size of the indicator 370. It should be noted that the processor 360 of the embodiment can have the length of the indicator 370 located on the third sensing route 386 and the third distance D5 of the pointer 370 from the corner C2 by the built-in method. Corresponding to the relationship information, and the processor 360 calculates the location of the indicator 370 based on the size of the indicator 370.

In other words, the closer the indicator 370 is to the image sensing window 352 of the image sensor 350 (ie, the smaller the third distance D5), the width W1 of the third dark line 352c appearing in the bright area 354 on the image sensing window 352. It will be bigger. The correspondence between the size of the width W1 and the length of the third distance D5 may be built in the processor in advance. Therefore, when the indicator 370 and the first image 370' are collinear with the image sensor 350, the processor 360 calculates a corresponding third distance D5 according to the size of the indicator 370.

In this embodiment, the processor 360 can further have a third angle A5 between the third sensing route 386 and the first imaginary line L1 by means of built-in, so the coordinates of the indicator 370 (D5.cosA5, D5) .sinA5) can be found. In the present embodiment, the third angle A5 is 90 degrees.

[Third embodiment]

FIG. 10 is a perspective view of a sensing system according to a third embodiment of the present invention. Referring to FIG. 2 and FIG. 10 , the sensing system 400 is different from the sensing system 200 in that the sensing system 400 omits the configuration of the first linear light source 230 and the second linear light source 240 . The sensing system 400 includes a first light source 430 disposed above the first plane 414 of the panel 410 and outside of the first region 412. The first light source 430 forms a second image 430' with respect to the reflective element 420. The first light source 430 and the second image 430' are located outside the sensing range of the image sensor 450. The indicator 470 has a reflective surface 472, and the reflective material of the reflective surface 472 meets, for example, the specifications of the European standard EN471, but is not limited thereto.

The first source 430 is adapted to emit invisible light, such as infrared light, having a wavelength of about 940 nanometers (nm). A first image (not shown) of the indicator 470 formed relative to the reflective element 420 is formed by the first light source 430 illuminating the reflective surface 472 of the indicator 470. The image sensor 450 can have a filter 456 disposed in front of the image sensing window 452. The indicator 470 can reflect invisible light to the filter 456, and the filter 456 filters other light such that the image sensing window 452 receives the invisible light reflected by the indicator 470. In addition, the image sensor 450 can also sense a first image (not shown) of the indicator 470.

It must be noted here that the first region 412 may be a non-rectangular quadrilateral, but is not shown in the drawing.

[Fourth embodiment]

11 is a perspective view of a sensing system according to a fourth embodiment of the present invention. Referring to FIGS. 2 and 11 , the sensing system 500 is different from the sensing system 200 in that the sensing system 500 can omit the configuration of the first linear light source 230 and the second linear light source 240 . The indicator 570 has a light-emitting device 572, and the first image (not shown) is formed by the light emitted by the light-emitting device 572. The image sensor 550 can sense the indicator 570 and its first image (not shown) formed relative to the reflective element 520.

It must be noted here that the first region 512 may be a non-rectangular quadrilateral, but is not shown in the drawing.

[Fifth Embodiment]

FIG. 12 is a top plan view showing the operation of a sensing system according to a fifth embodiment of the present invention. Referring to FIG. 3 and FIG. 12 , the sensing system 600 is different from the sensing system 200 in that the sensing system 600 can omit the configuration of the first linear light source 230 and the second linear light source 240 . The sensing system 600 further includes a first light source S1, a first reflector 630 and a second reflector 640. The first light source S1 is located beside the image sensor 650. The first light source S1, for example an infrared light emitting diode, is adapted to emit invisible light, such as infrared light. The image sensor 650 can have a filter 656, such as an infrared light pass filter, that allows infrared light to pass through and is disposed in front of the image sensing window 652.

The first reflector 630 is disposed on the second side 612 b of the first region 612 of the panel 610 and on the first plane 614 of the panel 610 . The first reflector 630 forms a second mirror image 630' with respect to the reflective element 620. The first reflector 630 has a first retroreflective surface 632, and the first retroreflective surface 632 is adapted to reflect the light emitted by the first source S1. That is, the material of the first reflector 630 may be a retro-reflective material.

The second reflector 640 is disposed on the third side 612c of the first region 612 of the panel 610 and on the first plane 614 of the panel 610. The second reflector 640 forms a third mirror image 640' with respect to the reflective element 620. The second reflector 640 has a second retroreflective surface 642, and the second retroreflective surface 642 is adapted to reflect the light emitted by the first source S1. That is, the material of the second reflector 640 may also be a retroreflective material.

The fourth side 612d of the first region 612 of the panel 610 forms a fourth mirror image 612d' with respect to the reflective element 620. The reflective element 620, the first reflector 630, the second reflector 640 and the fourth side 612d surround the first region 612. Reflective element 620, second image 630', third image 640' and fourth image 612d' surround second region 612'. The first reflector 630, the second mirror 630' and the third mirror 640' are located within the sensing range of the image sensor 650.

For example, the first light source S1 of the infrared light emitting diode emits infrared light, and the first retroreflective surface 632 of the first reflector 630 and the second retroreflective surface 642 of the second reflector 640 reflect infrared light. In other words, the functions of the first retroreflective surface 632 and the second retroreflective surface 642 reflecting the infrared light are the same as those of the first linear light source 230 and the second linear light source 240 of the first embodiment, and thus will not be described herein. Therefore, the indicator (not shown) and the first image (not shown) form a first dark line (not shown) and a second dark line on the image sensing window 652 of the image sensor 650, respectively. For the related description, refer to the content of the first embodiment, and details are not described herein again.

[Sixth embodiment]

FIG. 13 is a top plan view showing the operation of a sensing system according to a sixth embodiment of the present invention. Referring to FIG. 12 and FIG. 13 , the sensing system 700 of the present embodiment is different from the sensing system 600 of the fifth embodiment in that the sensing system 700 further includes a third reflector 790 and is located in the panel 710 . The shape of the first region 712 at the first plane 714 is a non-rectangular quadrilateral.

The third reflector 790 is disposed on the fourth side 712d of the first region 712, and the third reflector 790 forms a fourth mirror image 790' with respect to the reflective element 720. a reflective element 720 (disposed on the first side 712a of the first region 712), a first reflector 730 (arranged on the second side 712b of the first region 712), and a second reflector 740 (arranged in the first region 712) The three sides 712c) and the third reflector 790 surround the first region 712. The third reflector 790 has a third retroreflective surface 792, and the third retroreflective surface 792 is adapted to reflect the light emitted by the first source S2. That is, the material of the third reflector 790 may also be a retroreflective material.

The reflective element 720, the second mirror 730' formed by the first reflector 730 with respect to the reflective element 720, and the second mirror 740' and the fourth mirror 790' formed by the second reflector 740 with respect to the reflective element 720 surround the second Area 712'. The first reflector 730, the second mirror 730', the third mirror 740', and the fourth mirror 790' are located within the sensing range of the image sensor 750.

For example, the first light source S2 of the infrared light emitting diode emits infrared light, and the first retroreflective surface 732 of the first reflector 730, the second retroreflective surface 742 of the second reflector 740, and the third reflective body 790 The third retroreflective surface 792 reflects the infrared light. In other words, the first retroreflective surface 732, the second retroreflective surface 742, and the third retroreflective surface 792 reflecting infrared light function as the first linear light source 330, the second linear light source 340, and the third linearity of the second embodiment. The function of the light source 390 is therefore not described here. Therefore, the indicator (not shown) and the first image (not shown) form a first dark line (not shown) and a second dark line on the image sensing window 752 of the image sensor 750, respectively. For the related description, refer to the contents of the first embodiment and the second embodiment, and details are not described herein again.

In summary, the sensing system of an embodiment of the present invention has at least the following or other advantages. The processor of the sensing system of an embodiment of the present invention is capable of calculating the location of the pointer by the configuration of the reflective element and the image sensor. Therefore, compared with the prior art, the sensing system of the embodiment can adopt an image sensor, so that the production cost of the sensing system of the embodiment is low.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope is subject to the definition of the scope of the patent application attached.

100. . . Touch screen system

110, 210, 310, 410, 610, 710. . . panel

112. . . Touch screen area

112a, 212a, 212b, 212c, 212d, 312a, 312b, 312c, 312d, 612b, 612c, 612d, 712a, 712b, 712c, 712d. . . side

120, 130. . . Light sensor

140, 260, 360. . . processor

150, 270, 370, 470, 570. . . Indicator

162, 164, 282, 284, 382, 384, 386. . . Sensing route

200, 300, 400, 500, 600, 700. . . Sensing system

212, 212', 312, 312', 412, 512, 612, 612', 712, 712'. . . region

214, 222, 314, 414, 614, 714. . . flat

220, 320, 420, 520, 620, 720. . . Reflective element

230, 240, 330, 340, 390. . . Linear light source

212d', 230', 240', 270', 330', 340', 370', 390', 430', 612d', 630', 640', 730', 740', 790'. . . Mirror

250, 350, 450, 550, 650, 750. . . Image sensor

252, 352, 452, 652, 752. . . Image sensing window

252a, 252b, 352c. . . Dark grain

254, 354. . . Bright area

272,272’. . . Cutting edge

430, S1, S2. . . light source

456, 656. . . filter

472. . . Reflective surface

572. . . Illuminating device

630, 640, 790. . . Reflector

632, 642, 792. . . Retroreflective surface

A1, A2, A3, A4, A5. . . angle

C1, C2. . . corner

D1, D2, D3, D4, D5. . . distance

L1, L2. . . Imaginary line

W1. . . width

FIG. 1 is a schematic diagram of a conventional touch screen system.

2 is a perspective view of a sensing system according to a first embodiment of the present invention.

3 is a top plan view of the sensing system of FIG. 2 in operation.

4 is a schematic diagram of the processor of FIG. 3 calculating the location of the pointer.

FIG. 5 is a schematic diagram of an image sensing window of the image sensor of FIG. 3. FIG.

6 is a top plan view showing the operation of a sensing system according to a second embodiment of the present invention.

FIG. 7 is a schematic diagram of the processor of FIG. 6 calculating the position of the pointer.

8 is another schematic diagram of the processor of FIG. 6 calculating the location of the pointer.

9 is a schematic diagram of an image sensing window of the image sensor of FIG. 6.

FIG. 10 is a perspective view of a sensing system according to a third embodiment of the present invention.

11 is a perspective view of a sensing system according to a fourth embodiment of the present invention.

FIG. 12 is a top plan view showing the operation of a sensing system according to a fifth embodiment of the present invention.

FIG. 13 is a top plan view showing the operation of a sensing system according to a sixth embodiment of the present invention.

200. . . Sensing system

210. . . panel

212, 212’. . . region

212a, 212b, 212c, 212d. . . side

212d', 230', 240'. . . Mirror

214, 222. . . flat

220. . . Reflective element

230, 240. . . Linear light source

250. . . Image sensor

252. . . Image sensing window

260. . . processor

C1. . . corner

Claims (2)

A sensing system, adapted to sense an indicator and calculate a position of the indicator, comprising: a panel having a first plane and a first area located in the first plane, wherein the shape of the first area is Rectangularly having a first side, a second side, a third side and a fourth side; a reflective element disposed on the first side and located on the first plane, wherein the reflective element a second plane is substantially perpendicular to the first plane, the second plane is a specular reflection surface, the second plane reflects the first area to form a second area, and an image sensor is disposed on the third side a first corner intersecting the fourth side and located on the first plane, wherein the sensing range of the image sensor covers the first area and the second area; a first linear light source is disposed in the first Two sides are located on the first plane, wherein the first linear light source forms a second image with respect to the reflective element; and a second linear light source is disposed on the third side and located on the first plane, wherein The second linear light source is opposite to the reflective element Forming a third image, the fourth side forming a fourth image with respect to the reflective element, the reflective element, the first linear light source, the second linear light source and the fourth side surrounding the first area, the reflection The second image, the second image, and the fourth image surround the second region, and the first linear light source, the second image, and the third image are located within a sensing range of the image sensor And a processor electrically connected to the image sensor; when the indicator is adjacent to the first area, and the indicator forms a first image with respect to the reflective element, such that the indicator is located with the first image When the image sensor is within the sensing range, and when the pointer is adjacent to a portion of the first region, the first image is adjacent to a portion of the second region and the image sensor When the image sensor is not collinear, the image sensor senses the indicator along a first sensing route and senses the first image along a second sensing route, and the processor is configured according to the first sensing route The location of the indicator is calculated with the second sensing route. The sensing system of claim 1, wherein the processor has information of a first distance "D1" between the first side and the third side, and the processor calculates the indicator The location includes: determining a first angle "A1" between the first sensing route and the third edge; determining a second angle "A2" between the second sensing route and the third edge; The double D1 is divided by the sum of tanA1 and tanA2 to calculate a second distance "D2" between the pointer and the fourth side.