Light-receiving device and method for manufacturing light-receiving device
AssigneeHamamatsu Photonics K.K.
InventorMakio Kume
Life of this patent
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Abstract
A light-receiving device includes a light-receiving element in which a plurality of light-receiving portions are provided; and a glass cover that has a first surface and a second surface opposite to the first surface and that is fixed above the light-receiving element such that the second surface faces the light-receiving element. The glass cover includes a plurality of diffraction gratings provided in at least one of the first surface and an inside of the glass cover. Each of the plurality of diffraction gratings is configured to concentrate laser light for distance measurement on each of the plurality of light-receiving portions, the laser light for distance measurement incident on the first surface of the glass cover.
Claims14
A method for manufacturing a light-receiving device, the method comprising:
- a first step of preparing a light-receiving element in which a plurality of light-receiving portions are provided, and a glass cover having a first surface and a second surface opposite to the first surface;
- a second step of disposing the glass cover above the light-receiving element such that the second surface faces the light-receiving element, after the first step;
- and
- a third step of forming a plurality of light-concentrating elements in the glass cover by irradiating the glass cover with laser light for processing after the second step,
- wherein in the third step, the plurality of light-concentrating elements are formed such that each of the plurality of light-concentrating elements concentrates laser light for distance measurement on each of the plurality of light-receiving portions, the laser light for distance measurement incident on the first surface of the glass cover.
Dependencies are inferred from the claim text.