PATENT CLAIM ANALYSIS

Application Number: 15777382
Application Type: Utility
Filing Date: 2018-05
Publication Date: 2018-11
Patent Classification: ["257", "712000"]

Abstract:
Provided are a heat dissipation substrate capable of improving heat dissipation properties of an electronic component, and an electric power steering device. In the heat dissipation substrate, a plurality of thermal vias are disposed at least in an electronic component projection region in which a region of a bottom surface portion of the electronic component is projected to a mounting surface in a direction perpendicular to the mounting surface, and a surface density of the thermal vias which occupy the mounting surface per unit area is at least partially different. The plurality of thermal vias are disposed so that the surface density of the thermal vias becomes the greatest in a dense region on an inner side of an edge portion of the electronic component projection region.

Claim (Index 16):
A control unit controlling a motor in an electronic power steering device, comprising:\n a heat dissipation substrate including\n an electronic component including a semiconductor die of a field effect transistor and a heat spreader that is joined to a lower surface of the semiconductor die, and \n a plurality of thermal vias which passes through a mounting surface on which the heat spreader is mounted, a rear surface of the mounting surface, and the heat dissipation substrate between the mounting surface and the rear surface; and \n a heat sink provided on a rear surface side of the mounting surface and conducting heat of the heat dissipation substrate at least on a rear surface of the heat spreader through a thermal interface material; wherein in the heat dissipation substrate, at least the plurality of thermal vias is disposed in a projection region of the heat spreader in which the heat spreader is projected to the mounting surface in a direction perpendicular to the mounting surface, the thermal vias include a metal thin film on an inner wall of a through-hole passing through the heat dissipation substrate between the mounting surface and a rear surface of the mounting surface, a surface density of the thermal vias which occupies the mounting surface per unit area is at least partially different, the thermal vias do not exist on an outer side of a projection region of the heat spreader, the plurality of thermal vias surrounding a periphery of the semiconductor die is disposed in a vicinity of an outer edge of the heat spreader, the plurality of thermal vias being disposed on an outer side in a projection region of the semiconductor die and in a projection region of the heat spreader, and an interval between the thermal vias adjacent to each other becomes gradually wider from an inner side of a projection region of the semiconductor die to an outer side of a projection region of the semiconductor die.

Metadata:
- Claim Count in Document: 5.0
- Percentile: 93.0
- Lexical Diversity: 2.2931
- Patent Class: 257.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['11089254', '13195786', '14145288', '10172922', '11962224']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8989571651976795
- 35 USC 102 Novelty (BERT): 0.488187261179809
- Combined Prediction Score: 0.8578801747958925
- Mean Citation Score: 190.978614
- Max Citation Score: 196.87299
- Similarity Product: 145.50567799557922

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test