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Optical sensor and electronic device

A technology of light sensor and light emitting part, which is applied in the field of light sensor to achieve the effect of high-precision distance measurement

Active Publication Date: 2019-01-11
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The light receiving unit 111 can detect faint light, but cannot detect pulses (effective data) output from the light receiving unit 111 due to the reflected light component of the object, and pulses (valid data) output from the light receiving unit 111 due to components other than the reflected light of the object such as signal light and ambient light. or heat output pulse (invalid data) for discrimination

Method used

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  • Optical sensor and electronic device
  • Optical sensor and electronic device
  • Optical sensor and electronic device

Examples

Experimental program
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no. 1 approach 〕

[0032] refer to Figure 1 to Figure 7 A first embodiment of the present invention will be described.

[0033] (Schematic configuration of TOF sensor)

[0034] The TOF sensor 100 (optical sensor) measures the distance between the TOF sensor 100 and the object 50 by calculating the distance based on the time difference between the time when the light is emitted to the object and the time when the reflected light reflected by the object is received. The TOF sensor 100 is used in electronic devices such as smartphones and cameras, for example.

[0035] First, the schematic configuration of the TOF sensor 100 is summarized as follows.

[0036] The TOF sensor 100 includes: a light-emitting element 6 (light-emitting part), which emits light according to a reference pulse; a first light-receiving part 1, which outputs a first light-receiving pulse through light incidence; a first digital operation part 14 (a first calculation part) ), which is based on the number of first light-rec...

Deformed example 1

[0125] The following is based on Figure 7 , the first digital operation unit 141 as a modified example of the schematic configuration of the first digital operation unit 14 will be described. Figure 7 It is a block diagram showing a modified example of the configuration of the first digital operation unit 14 of the TOF sensor 100 . Furthermore, the circuit of the second digital operation unit 24 can also be configured in the same modified example as that of the first digital operation unit 14 .

[0126] The first digital operation unit 141 such as Figure 7 As shown, a lighting period counter 60 for counting the first output pulse number, a non-light-emitting period counter 61 for counting the second output pulse number, a multiplication circuit 62 for performing multiplication processing, and a subtraction circuit for performing subtraction processing may be respectively provided. 63. The light-emitting period counter 60 and the subtraction circuit 63, the non-light-emit...

no. 2 approach 〕

[0132] refer to figure 1 and Figure 8 , the second embodiment of the present invention will be described. Figure 8 It is a diagram for explaining the operation in the pulse acquisition period of the TOF sensor 100A according to the second embodiment of the present invention. The TOF sensor 100A differs from the TOF sensor 100 in that the light-emitting period T1 and the non-light-emitting period T2 are divided into one cycle, and other configurations are the same.

[0133] (Divide the light-emitting period and non-light-emitting period into one cycle)

[0134] In this embodiment, if Figure 8 As shown, the light-emitting period T1 and the non-light-emitting period T2 are divided into one cycle and implemented alternately. Specifically, the light-emitting period T1 is divided into a light-emitting period T11, a light-emitting period T12, and a light-emitting period T13 in one cycle, and the non-light-emitting period T2 is divided into a non-light-emitting period T21, a n...

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Abstract

A TOF sensor (100) is provided with: a light emitting element (6) that emits light in accordance with a reference pulse; a first light reception part (1) that outputs a pulse in response to incidenceof light; a first digital calculation unit (14) that calculates the number of third outputted pulses from the first light reception part (1) in response to incidence of reflected light (L2); and a distance calculation unit (33) that calculates the distance from the host device to an object when the number of the third outputted pulses is larger than a first reference value.

Description

technical field [0001] The present invention relates to light sensors, and more particularly to light sensors using the avalanche effect. Background technique [0002] Conventionally, an avalanche photodiode utilizing an avalanche amplification (avalanche) effect of a photodiode has been used as a light receiving element for detecting weak light at high speed in optical communication or time-of-flight (TOF) measurement. [0003] The avalanche photodiode operates in a linear mode when a reverse bias voltage lower than the drop voltage (breakdown voltage) is applied, and the output current changes in a positive correlation with the received light amount. On the other hand, an avalanche photodiode operates in the Geiger mode when a reverse bias voltage equal to or higher than the voltage drop is applied. Geiger-mode avalanche photodiodes can generate a large output current by causing an avalanche phenomenon even when a single photon is incident on it. Therefore, the Geiger mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/10G01S7/4861
CPCG01S17/10G01S7/4816G01S7/4861G01S7/487G01S7/4876
Inventor 佐藤秀树
Owner SHARP KK
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