Distance measuring device and light receiving method thereof

Abstract

To make a modulation frequency of a light source and a modulation frequency of a ToF sensor synchronized, when the light source and the ToF sensor are configured separately.SOLUTION: A distance measuring device for receiving reflection light, which has been emitted from a light source of another device, reflected from an object, comprises: a receiving unit that generates a signal synchronized with a synchronous clock signal of another device by performing synchronization processing of a transmission signal transmitted from another device via wireless communication; a reference clock generating unit that generates a reference clock signal on the basis of the synchronous clock signal as a reference when the light source of another device emits light; and a ToF sensor that receives reflection light, which has emitted from the light source of another device, reflected from an object on the basis of the reference clock signal. The present technology may be applied to, for example, a distance measuring device that measures a distance to a subject.SELECTED DRAWING: Figure 9

Claims

1. A distance measuring device that receives reflected light that is returned after light emitted from a light source provided by another device is reflected by an object, A communication unit that generates a signal synchronized with the synchronization clock signal of the other device by performing synchronization processing on a transmission signal that has been transmitted wirelessly from the other device, A reference clock generation unit generates a reference clock signal that serves as a reference when the light source emits light in the other device, based on the aforementioned synchronization clock signal. Based on the aforementioned reference clock signal, a ToF sensor that receives the reflected light, A signal processing unit calculates the phase shift of the irradiated light from the other device based on the relative position between the other device and the distance measuring device, the three-dimensional position of a predetermined point on the object, and the distance calculated based on the detection result of the ToF sensor at the predetermined point. Equipped with, The communication unit transmits an instruction to adjust the phase shift to the other device via wireless communication. A distance measuring device equipped with the following features.

2. The communication unit receives light source information relating to the irradiation light emitted from the light source via wireless communication. The light source information includes one of the following: emission time, emission start time information, modulation frequency, light source wavelength, or emission pattern. The distance measuring device according to claim 1.

3. The communication unit receives transmission signals transmitted wirelessly from the other device via the network. The distance measuring device according to claim 1.

4. The signal processing unit calculates the distance to the other device based on the detection result of the ToF sensor. The distance measuring device according to claim 1.

5. The communication unit transmits the distance to the other device as a first distance to the other device, and receives the distance calculated by the other device as a second distance. The distance measuring device according to claim 4.

6. The system further includes a distance calculation unit that calculates the relative distance to the other device from the first distance and the second distance. The distance measuring device according to claim 5.

7. The ToF sensor receives reflected light that is returned after the illumination light emitted from each of the light sources of the multiple other devices is reflected by an object. The distance measuring device according to claim 1.

8. The signal processing unit calculates the distance to the object based on the phase difference of the illumination light emitted from each of the light sources of the plurality of other devices. The distance measuring device according to claim 7.

9. A distance measuring device that emits illumination light for a ToF sensor provided by another device, A communication unit that transmits wireless communication transmission signals to the aforementioned other device, A reference clock generation unit generates a reference clock signal that serves as a reference when the light source emits light, based on a synchronization clock signal synchronized with the aforementioned transmission signal. Based on the aforementioned reference clock signal, the light source that emits the illumination light and Equipped with, When the communication unit receives an instruction from the other device via wireless communication to adjust the phase shift, the light source emits the illumination light with the phase shift adjusted. Distance measuring device.

10. A communication unit that transmits and receives wireless communication signals, A reference clock generation unit that generates a reference clock signal, Signal processing unit, light source, ToF sensor and A ranging device equipped with, When the distance measuring device receives reflected light that has been reflected back by an object from a light source provided by another device other than itself, The communication unit generates a signal synchronized with the synchronization clock signal of the other device by performing synchronization processing on the transmission signal transmitted wirelessly from the other device. The reference clock generation unit generates a reference clock signal based on the synchronization clock signal, which serves as the reference when the light source emits light in the other device. The ToF sensor receives the reflected light based on the reference clock signal, The signal processing unit calculates the phase shift of the illumination light from the other device based on the relative position between the other device and the distance measuring device, the three-dimensional position of a predetermined point on the object, and the distance calculated based on the detection result of the ToF sensor at the predetermined point. The communication unit transmits an instruction to adjust the phase shift to the other device via wireless communication. If the distance measuring device emits light for other ToF sensors, The communication unit transmits the wireless communication transmission signal to the other device equipped with the ToF sensor. The reference clock generation unit generates a reference clock signal based on a synchronization clock signal synchronized with the transmission signal. The light source emits illumination light for the other ToF sensor based on the reference clock signal. Distance measuring device.

11. A distance measuring device having a ToF sensor that receives reflected light that returns after light emitted from a light source provided by another device is reflected by an object, By performing synchronization processing on the transmission signal received wirelessly from the other device, a signal synchronized with the synchronization clock signal of the other device is generated. Based on the aforementioned synchronization clock signal, a reference clock signal is generated in the other device that serves as a reference when the light source emits light. Based on the aforementioned reference clock signal, the ToF sensor receives the reflected light. Based on the relative position between the other device and the distance measuring device, the three-dimensional position of a predetermined point on the object, and the distance calculated based on the detection result of the ToF sensor at the predetermined point, the phase shift of the irradiation light from the other device is calculated. An instruction to adjust the phase shift is transmitted to the other device via wireless communication. A method for receiving light from a distance measuring device.

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