Position detection device
A detection device and technology for electrical signals, applied in measurement devices, optical devices, radio wave measurement systems, etc., can solve problems such as the reduction of SN ratio and the inability to effectively use the input dynamic range of the computing device.
Inactive Publication Date: 2022-04-05
TOYODA GOSEI CO LTD
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Problems solved by technology
Therefore, in order to converge such an electrical signal to the input dynamic range of the computing device at the subsequent stage, the amplitude of the input signal to the low-frequency cut section must be reduced. As a result, the SN ratio (signal-to-noise ratio) decreases due to the decrease in the signal amplitude. , there is a problem that the input dynamic range of the computing device cannot be effectively used
Method used
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Embodiment Construction
[0026] Next, an embodiment of the position detection device will be described.
[0027] Such as figure 1 As shown, the position detection device of the present embodiment has a base having a three-layer structure including a lower base 21 , a middle base 22 , and an upper base 23 .
[0028] A light receiving element 24 (a photodiode in this embodiment) for detecting the light intensity of incident light is provided on the lower base 21 . The light receiving element 24 is located on the middle base 22 side of the lower base 21 ( figure 1 The center of the face of the upper side). The light receiving element 24 is disposed in a gap between the lower base 21 and the upper base 23 . The upper base 23 is provided with the lamination direction of the base ( figure 1 The through-hole (small hole 25) that penetrates the upper base portion 23 in the vertical direction). The small hole 25 is formed at a position facing the light receiving portion of the light receiving element 24 ....
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The position detection device has a plurality of light-emitting units, a light-receiving unit, a low-frequency cut-off unit, and a position detection unit. The plurality of light-emitting units emit detection light that has been intensity-modulated in accordance with a sequence of modulation signals having different phases. The light receiving unit receives reflected light of the detection light reflected by the object and converts the reflected light into an electric signal. The position detection unit detects the position of the object on the basis of the electrical signal attenuated by the low-frequency cutoff unit. The low-frequency cut-off unit sets a first cut-off frequency, which is a cut-off frequency of the first period, to be higher than a second cut-off frequency, which is a cut-off frequency of the second period, if a first period is defined as an initial period or a midway period of a modulation period during which intensity modulation is performed in accordance with the modulation signal sequence, and a period other than the first period is defined as a second period.
Description
technical field [0001] The present disclosure relates to a position detection device for detecting the position of an object. Background technique [0002] As a position detection device that detects the position of an object, there is an optical position detection device (for example, JP-A-2011-215099). [0003] The position detection device described in the above publication includes a plurality of light emitting units, light receiving units, and position detecting units (calculation devices). The plurality of light emitting units emit detection light toward the object. The light receiving unit receives reflected light reflected by a target object and converts it into an electrical signal. The position detection unit (calculation device) detects the position of the object based on the electric signal. The device is configured to input an electric signal to the computing device via a low-frequency cutoff unit that attenuates components of frequencies lower than the cutof...
Claims
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IPC IPC(8): G01B11/00
CPCG01S7/4815G01S17/42G01S17/32G01S7/4808G01S7/4813
Inventor 堀边隆介安田博
Owner TOYODA GOSEI CO LTD