Light spot position detection device, optical component and electronic equipment

Abstract

The present invention relates to a light spot position detection device, an optical component comprising the device and electronic equipment comprising the optical component. In a light spot position detection device, in one frame of operation, under control of a control unit, pixel data obtained in a pixel section in exposure of a solid-state image sensor in synchronization with light emission of a light emitting element are added to corresponding storage portions in a memory unit, and pixel data obtained in exposure of the image sensor asynchronous to the light emission of the light emitting element are subtracted from the corresponding storage portions, to store pixel data of only signal light in the storage portions. A given number of frames of operation are repetitively performed toaccumulate pixel data of only the signal light in the storage portions. The position of a light spot on the pixel section is calculated based on the pixel data of only the signal light and outputted whether the storage portions are saturated or not with the pixel data.

Description

technical field [0001] The present invention relates to a light spot position detection device for detecting the position of a light spot formed on a solid-state imaging element by an optical system, an optical component including the same, and an electronic device including the optical component. Background technique [0002] An optical distance measuring device is representative of a device equipped with a light spot position detection device that detects the position of a light spot formed on the solid-state imaging element by an optical system on the solid-state imaging element. The measurement principle of this optical distance measuring device generally utilizes known triangulation distance measurement, and detects the above-mentioned The position of the light-receiving point on the solid-state imaging element is used to calculate the distance to the above-mentioned measurement object. [0003] As such an optical distance measuring device, there is a distance measurin...

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Problems solved by technology

[0012] First, in the case of the distance measuring device disclosed in Patent Document 1, the output current i from the PSD 4 is changed according to the measurement environment. 1 i 2 Therefore, the short-distance measurement can be performed relatively early. In contrast, the long-distance measurement takes time, so the distance measurement period is not fixed, and it is very difficult to use for the subsequent equipment that obtains the distance measurement value.

[0013] In addition, there is a problem that it is difficult to achieve miniaturization as described above by using the signal processing using the above-mentioned PSD4.

[0014] In addition, when the distance measuring device disclosed in the above-mentioned Patent Document 1 is applied to a solid-state imaging device, since the amount of reflected light emitted from the IRED3 and reflected on the object is small, it may be difficult to mount a device that acquires the device together with ambient light. The reflected light of IRED3 is an analog circuit that only extracts the above reflected light, and there is a problem of lack of resistance to ambient light

[0015] Next, in the case of the distance measuring device for a camera disclosed in the above-mentioned Patent Document 2, the environmental light resistance is improved by using a solid-state imaging element as the light receiving element 10, but there is a problem that it is difficult to measure distances from short distances to long distances by using reflected light. problem of distance

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