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US 10,379,426 B2Granted
Dome-shaped cover, method for manufacturing dome-shaped cover, mold for forming dome-shaped cover, and camera
AssigneeCanon Kabushiki Kaisha
InventorShusuke Tobita
Life of this patent
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Abstract
A dome-shaped cover having a high optical performance in which formation of a weld mark is suppressed. The dome cover includes a hemispherical portion, a collar portion, and a cylindrical portion provided between the hemispherical portion and the collar portion, and the cylindrical portion has a thin portion recessed from an outer surface of the cylindrical portion.
Claims24
A dome-shaped cover comprising:
- a hemispherical portion,
- a collar portion, and
- a cylindrical portion,
- wherein the hemispherical portion has an outer surface and an inner surface,
- wherein the cylindrical portion has an outer surface and an inner surface, and the outer surface forms an outer circumference of the cylindrical portion,
- wherein the hemispherical portion has an end connected to an end of the cylindrical portion, and the cylindrical portion has an end connected to an end of the collar portion at an end opposite to the end connected to the hemispherical portion,
- wherein the collar portion has a gate mark,
- wherein the cylindrical portion has a thin portion, the thin portion being recessed from the outer surface of the cylindrical portion toward the inner surface of the cylindrical portion,
- wherein the outer surface of the thin portion is a part of the outer surface of the cylindrical portion,
- wherein, in a circumferential direction of the cylindrical portion, the thin portion is between other portions of the cylindrical portion that are thicker than the thin portion, and
- wherein a portion of the outer surface of the cylindrical portion that is closest to the gate mark is located, on the outer circumference of the cylindrical portion, opposite to the thin portion.
8 more elements
A method for manufacturing a dome-shaped cover, comprising:
- forming a cavity by a stripper plate for forming an outer surface of a cylindrical portion, a collar portion, and a gate connected to the collar portion, a concave mold piece for forming an outer surface of a hemispherical portion, and a convex mold piece for forming inner surfaces of the hemispherical portion and the cylindrical portion;
- and
- injecting resin into the cavity through the gate connected to the collar portion,
- wherein the stripper plate includes a projecting portion for forming a thin portion and a forming portion for forming the outer surface of the cylindrical portion,
- wherein the cylindrical portion has the thin portion on the outer surface thereof,
- wherein the outer surface of the thin portion is a part of the outer surface of the cylindrical portion,
- wherein the thin portion is recessed from the outer surface of the cylindrical portion toward the inner surface of the cylindrical portion,
- wherein, in a circumferential direction of the cylindrical portion, the thin portion is bordered by other portions of the cylindrical portion,
- wherein the other portions of the cylindrical portion are thicker than the thin portion, and
- wherein the thin portion is formed opposite a gate mark on the collar portion where resin is injected into the cavity through the gate.
7 more elements
A mold for forming a dome-shaped cover, comprising:
- a stripper plate for forming an outer surface of a cylindrical portion, a collar portion, and a gate connected to the collar portion;
- a concave mold piece for forming an outer surface of a hemispherical portion;
- and
- a convex mold piece for forming inner surfaces of the hemispherical portion and the cylindrical portion,
- wherein the stripper plate includes a projecting portion for forming a thin portion and a forming portion for forming the outer surface of the cylindrical portion,
- wherein the thin portion is formed on the outer surface of the cylindrical portion,
- wherein the outer surface of the thin portion is a part of the outer surface of the cylindrical portion,
- wherein the thin portion is recessed from the outer surface of the cylindrical portion toward the inner surface of the cylindrical portion,
- wherein, in a circumferential direction of the cylindrical portion, the thin portion is between other portions of the cylindrical portion that are thicker than the thin portion, and
- wherein the thin portion is formed opposite the gate connected to the collar portion.
7 more elements
A dome-shaped cover comprising:
- a hemispherical portion,
- a collar portion, and
- a cylindrical portion,
- wherein the hemispherical portion and the cylindrical portion have outer surfaces and inner surfaces,
- wherein the inner surface of the cylindrical portion has a diameter,
- wherein the hemispherical portion has an end connected to an end of the cylindrical portion, and the cylindrical portion has an end connected to an end of the collar portion at an end opposite to the end connected to the hemispherical portion,
- wherein the collar portion has a gate mark,
- wherein the cylindrical portion has a thin portion, the thin portion being recessed from the outer surface of the cylindrical portion toward the inner surface of the cylindrical portion, wherein, in a circumferential direction of the cylindrical portion, the thin portion is abutted by other portions of the cylindrical portion that are thicker than the thin portion, and
- wherein a distance between the outer surface of the thin portion of the cylindrical portion and a portion of the outer surface of the cylindrical portion that is closest to the gate mark of the collar portion is greater than the diameter of the inner surface of the cylindrical portion.
6 more elements
Dependencies are inferred from the claim text.