Position detection system and projection display system

a technology of projection display and detection system, which is applied in the direction of material analysis, optical radiation measurement, instruments, etc., can solve the problems of insufficient position detection, insufficient light received by light receiving units, and inability to detect the respective positions of two detection targets

Inactive Publication Date: 2014-09-25
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables accurate detection of multiple detection targets by suppressing interference between their reflected signals, ensuring precise positioning without mixing up the positions of individual targets.

Problems solved by technology

However, in the position detection systems disclosed in Patent Document 1 and Patent Document 2, if two detection targets are placed at the same time within the detection space, the light detection unit may not respectively distinguish the reflected lights of the two detection targets, but may detect the intermediate position between the two detection targets.
Accordingly, there has been a problem that it may be impossible to detect the respective positions of the two detection targets.
Since the retroreflectors have the properties of reflecting incident light in parallel in the opposite direction, if the angles formed by the lines connecting the light output unit and the first detection target and the second detection target and the lines connecting the photodetector and the first detection target and the second detection target are more than 10 degrees, the amount of light received by the light receiving units becomes smaller and insufficient for position detection.

Method used

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  • Position detection system and projection display system
  • Position detection system and projection display system
  • Position detection system and projection display system

Examples

Experimental program
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embodiment 1

Overall Configuration of Position Detection System

[0041]FIG. 1 is a schematic perspective view showing a configuration of a position detection system, and FIG. 2 is a schematic side view showing the configuration of the position detection system. FIG. 3 is a schematic front view showing the configuration of the position detection system. As shown in FIGS. 1 to 3, the position detection system 1000 according to the invention includes a first detection target 31 and a second detection target 32 as targets of position detection, and a light output unit 20 that outputs lights toward the first detection target 31 and the second detection target 32. The position detection system 1000 further includes a photodetector 30 as a position detection unit that receives respective reflected lights (a first reflected light 41 and a second reflected light 42) of the first detection target 31 and the second detection target 32. A projection display system 1100 includes the optical position detection ...

modified example 1

[0099]In the embodiment, the first frequency filter 151 and the second frequency filter 152 having different reflection characteristics from each other have been provided on the surfaces of the first detection target 31 and the second detection target 32, respectively. The different reflection characteristics from each other may be provided not by providing the first frequency filter 151 and the second frequency filter 152, but by forming constituent materials exposed on the surfaces of the first detection target 31 and the second detection target 32 using different materials.

modified example 2

[0100]In the embodiment, the first detection target 31 and the second detection target 32 and the corresponding first reflected light detection part 511 and second reflected light detection part 521 have been provided. Further, the positions of the first detection target 31 and the second detection target 32 have been respectively detected using different wavelength ranges from each other. Not limited to the method, but three or more detection targets and three or more photodetectors are provided and the positions of the three or more detection targets may be respectively detected using three or more different wavelength ranges.

[0101]The embodiment has been explained in detail, and the person who skilled in the art could easily understood that many modifications may be made without substantially departing from the new matter and effects of the invention. Therefore, all of the modified examples are contained within the range of the invention. For example, in the specification and the...

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Abstract

An optical position detection system includes a light output unit that outputs lights toward a first detection target and a second detection target, and a first light receiving unit that receives a first reflected light from the first detection target and a second light receiving unit that receives a second reflected light from the second detection target having different wavelengths, wherein the first detection target has a first reflection filter that reflects the first reflected light and the second detection target has a second reflection filter that reflects the second reflected light.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation of U.S. application Ser. No. 13 / 417,627 filed Mar. 12, 2012 which claims priority to Japanese Patent Application No. 2011-055185 filed Mar. 14, 2011, all of which are expressly incorporated by reference herein in their entireties.BACKGROUND[0002]1. Technical Field[0003]The present invention relates to a position detection system that optically detects a position of a detection target and a projection display system.[0004]2. Related Art[0005]In the past, position detection systems like touch panels have been used for electronic devices with display screen such as cellular phones, car navigation systems, automated ticket vending machines, and automated teller machines. The position detection system is provided at the visual recognition side of the display screen and detects a position of a detection target like a pen or a finger by placing the detection target on the display screen while referring to an image on the d...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G01B7/14
CPCG06F3/0416G01B7/14G06F3/0425G06F3/0421
InventorKIYOSE, KANECHIKAENDO, KOGO
OwnerSEIKO EPSON CORP