# US 5,705,254 A · Plastic molded article with a finished surface appearance

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,705,254 A
- Document ID: US5705254A
- Status: Granted
- Kind: A
- Application number: 08/705,279
- Filed: 1996-08-29
- Granted: 1998-01-06
- Earliest claimed: 1994-03-10
- Assignees: Canon Kabushiki Kaisha
- Inventors: Hisakazu Morinaga; Shoichi Shimura; Kazutaka Takeuchi
- Web page: https://patentgrep.com/patent/US5705254A

## CPC

- B29C 33/424: {Moulding surfaces provided with means for marking or patterning (for injection moulding B29C45/372)}
- B29C 45/372: {provided with means for marking or patterning, e.g. numbering articles}
- Y10T 428/24355: Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
- Y10T 428/24479: including variation in thickness
- Y10T 428/268: Monolayer with structurally defined element
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A plastic molded article has an external appearance of a coated article and is formed by injection molding using a mold with a surface shaped by forming machining marks in the form of recesses over the entire mold surface. The resulting plastic molded article has a center line average roughness of the surface shaped of the plastic molded article less than 0.5 .mu.m and one of either an average slope within the range of 1.0.about.10.0.degree. or an average peak-to-peak interval within the range of 5.0-30.0 .mu.m.

## Claims

### Claim 1

A plastic molded article having an external appearance of a coated article and formed by injection molding using a mold with a surface shaped by forming machining marks in the form of recesses over the entire mold surface, with each recess having a radius of less than 25 .mu.m, comprising:
a plastic molded article having a surface shape of the mold surface, wherein
the plastic molded article has a centerline average roughness Ra of the surface shape of the plastic molded article less than 0.5 .mu.m and one of either an average slope .DELTA.q within the range of 1.0.degree..about.10.0.degree. an average peak-to-peak interval S within the range of 5.0-30.0 .mu.m, whereby an 85.degree. specular gloss value of the molded article surface is greater than 40% and less than 80%, which is equivalent to a gloss value of the coated article surface.

### Claim 2 (depends on 1)

The article according to claim 1, wherein a center-line average roughness Ra of the surface shape of said plastic molded article is less than 0.5 .mu.m and an average peak-to-peak interval S falls within the range 5.0.about.30.0 .mu.m.

### Claim 3 (depends on 1)

The article according to claim 1, wherein said article is used as an external portion of a camera.

### Claim 4 (depends on 1)

The article according to claim 1, wherein said molded article is used as an external portion of a portable manufactured article.

### Claim 5 (depends on 1)

The article according to claim 1, wherein said molded article is used as an external portion of office automation equipment.

### Claim 6 (depends on 1)

The article according to claim 1, wherein the machining marks formed in the mold surface are in the form of recesses and have a true circularity of less than 40% of the equivalent radius of each machining mark occupying more than 90% of the surface of the mold.