METHOD FOR PRODUCING GROUP III NITRIDE CRYSTALS

    公开(公告)号:US20250129514A1

    公开(公告)日:2025-04-24

    申请号:US18990573

    申请日:2024-12-20

    Abstract: A method for manufacturing a Group III nitride crystal, the method including: bringing a surface of a Group III nitride seed crystal into contact with a melt including at least one Group III element selected from among gallium, aluminum, and indium and an alkali metal in an atmosphere containing nitrogen to cause the Group III element and the nitrogen to react with each other in the melt to grow a Group III nitride crystal on the Group III nitride seed crystal, the method includes: growing a plurality of island-like Group III nitride crystal nuclei on the surface of the Group III nitride seed crystal; growing a first Group III nitride crystal having an inverted triangular shape or a trapezoidal shape in section from each of the plurality of island-like Group III nitride crystal nuclei; and growing a second Group III nitride crystal such that the second Group III nitride crystal fills a depression of the first Group III nitride crystal to form the second Group III nitride crystal having a flat surface, wherein in the course of growing the plurality of island-like Group III nitride crystal nuclei, a temperature is set to 875° C. or more and a nucleation density is set to 1*106/cm2 or less, and in the course of growing the first Group III nitride crystal and growing the second Group III nitride crystal, immersion of the Group III nitride seed crystal in the melt and pulling up from the melt are repeated a plurality of times.

    OPHTHALMIC EXAMINATION APPARATUS AND OPHTHALMIC EXAMINATION METHOD

    公开(公告)号:US20250072744A1

    公开(公告)日:2025-03-06

    申请号:US18820069

    申请日:2024-08-29

    Abstract: An ophthalmic examination apparatus includes a visual target projection system that includes a visual target presentation portion that presents a fixed visual target to left and right subject eyes, an objective measurement optical system that objectively measures eye characteristics of the left and right subject eyes, and a controller that controls each portion of the apparatus, wherein the controller measures the eye characteristics of the left and right subject eyes with the objective measurement optical system and acquires an objective refraction value as objective measurement information when fusion is attempted with left and right subject eyes with respect to a change in the convergence distance.

    Magnetic body inspection apparatus and magnetic body inspection method

    公开(公告)号:US12235240B2

    公开(公告)日:2025-02-25

    申请号:US18009113

    申请日:2021-05-25

    Inventor: Daichi Chiba

    Abstract: A magnetic body inspection method and magnetic body inspection apparatus (1) that has a magnet (10) and a magnetic sensor (20) that outputs electric signals. At least two electric signals are obtained by the magnetic sensor (20). A magnetic body present inside a nonmagnetic body can be detected non-destructively, by outputting the difference between the two obtained electric signals.

    OPHTHALMOLOGIC APPARATUS AND METHOD FOR EXAMINING SUBJECT EYES

    公开(公告)号:US20250057410A1

    公开(公告)日:2025-02-20

    申请号:US18804483

    申请日:2024-08-14

    Abstract: An ophthalmologic apparatus includes a visual target presenting portion that presents fixation targets to subject eyes; an objective measurement optical system that objectively measures eye characteristics of the subject eyes; and a controller. Each of the fixation targets includes fusion targets depicted in a manner that allows binocular fusion while the subject eyes respectively view the fixation targets. The visual target presenting portion presents the fixation targets while changing an examination distance from the subject eyes to the fixation target when an anisometropia is induced. In the anisometropia, one subject eye is in a fully corrected condition and the other subject eye is corrected by a predetermined degree from the fully corrected condition. The controller controls the objective measurement optical system to measure the eye characteristics while the subject eyes binocularly view the fixation targets and acquire refractive values of the subject eyes as objective measurement information.

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