# US 4,394,082 A · Shutter for camera

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

- Number: US 4,394,082 A
- Document ID: US4394082A
- Status: Granted
- Kind: A
- Application number: 06/225,524
- Filed: 1981-01-16
- Granted: 1983-07-19
- Earliest claimed: 1980-01-23
- Assignees: Canon Kabushiki Kaisha
- Inventors: Michio Senuma; Kunio Watanabe
- Web page: https://patentgrep.com/patent/US4394082A

## CPC

- G03B 9/08: Shutters
- G03B 9/18: More than two members
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

The shutter blades of a camera are made lighter in weight in order to reduce the driving power needed to obtain a desired running speed by forming the shutter blades of a metal coated plastic sheet member which may be painted black in order to prevent light reflection, with the thickness of the metal coating being between 0.001 to 0.005 mm.

## Claims

### Claim 1

A shutter for a camera comprising:
an opening for light to pass therethrough;
a plurality of shutter blades for opening and closing said opening for said light, said plurality of shutter blades comprising
(a) a plastic sheet
(b) a metal layer formed on both surfaces of said plastic sheet, said metal layer having a thickness of between 0.001 to 0.005 mm;
(c) a black coating on the surface of said metal layer;
(d) an embossed member for effecting connection with said shutter blades; and
(e) shutter driving members mounted on said embossed portions of each of said plurality of shutter blades so as to connect said shutter blades to each other, said members opening and closing said plurality of shutter blades.

### Claim 2 (depends on 1)

A shutter for a camera in accordance with claim 1 wherein said metal layer is a nickel coating.