Optical Position Detection Apparatus
A technology for optical position detection and equipment, applied in optics, optical components, lighting and heating equipment, etc., can solve problems such as unit size increase, light attenuation, difficult optical axis coincidence, etc., to achieve easy disassembly and attachment, and compact shape. Effect
Inactive Publication Date: 2012-04-18
株式会社施乐库 +1
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Problems solved by technology
However, in this case, the cell size increases accordingly, so that the cell covers the entire side of the detection area, so that in the case where the detection area is extremely large, the size of the entire device increases
[0007] Furthermore, in Patent Document 1, a half mirror or the like is used to make the optical axes of the light source and the image sensor coincide with each other, so that the amount of light is attenuated resulting in low efficiency
In addition, it is difficult to make the optical axes of the components including the curved mirror coincide with each other
Method used
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[0032] Embodiments for realizing the present invention will be described below with reference to the accompanying drawings. figure 1 is a schematic configuration view for explaining the optical position detection device according to the first embodiment of the present invention. The first embodiment is an example in which the position is detected by a pointer such as a finger or a pointer strip, which itself has no special function. as in figure 1 As shown in , the optical position detection device capable of detecting the indicated position of the indicator 2 on the detection area 1 is mainly composed of a retroreflective member 10 and a detection unit 20 .
[0033] The retroreflective member 10 is arranged to cover at least a part of the detection area 1 . More specifically, the retroreflective member 10 is arranged to cover three sides surrounding the detection area 1 .
[0034] The detection unit 20 is provided at a portion of the periphery of the detection area 1 . Mo...
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This invention is to provide an optical position detection apparatus includes a retroreflective member (10) and a detection unit (20). The retroreflective member is disposed so as to cover the periphery of the detection area. The detection unit is disposed at one portion of the periphery of the detection area and detects a pointing position of the pointer by using reflection light reflected from the retroreflective member. The detection unit includes two detection sections (21) each having a light source section and a camera section. The light source section has an irradiation angle wide enough to irradiate the entire detection area with light. The camera section includes a super-wide-angle lens and an image sensor, is disposed close to the light source section, and has a viewing angle wide enough to image the entire detection area. The two detection sections are arranged such that the distance therebetween is smaller than the width of the detection area as viewed in the direction from the detection unit toward the detection area.
Description
technical field [0001] The present invention relates to an optical position detection device, and more particularly to an optical position detection device that optically detects a position on a detection area indicated by a pointer using an image sensor. Background technique [0002] In recent years, various optical position detection devices and digitizers utilizing image sensors have been developed. For example, Patent Document 1 filed by the present inventors discloses an optical digitizer having: an image sensor arranged around a detection area to image a pointer; an imaging lens; and a curved mirror for expanding the viewing angle of the image sensor. In this technique, a curved mirror is utilized to prevent the disadvantage that, in the case where an image sensor is disposed near an adjacent corner of the detection area, the image sensor is physically located outside of the detection area in the lateral direction. By utilizing curved mirrors, the image sensor and li...
Claims
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IPC IPC(8): G06F3/042G06F3/041G06F3/033G06F3/0354
CPCG06F3/0428G06F3/0421F21S4/006G02B9/34G02B13/06G06F3/042
Inventor 小川保二
Owner 株式会社施乐库