Lens and production method therefor

• US 20020030899A1
• Filed: 08/29/2001
• Published: 03/14/2002
• Est. Priority Date: 09/04/2000
• Status: Active Grant

• Current Assignee: Pioneer Corporation
• Original Assignee: Pioneer Corporation
• Inventors: Sato, Makoto, Maeda, Takanori, Koike, Katsuhiro, Kikuchi, Ikuya
• Granted Patent: US 6,529,339 B2
• Time in Patent Office: Days
• US Class Current: 359/811
• CPC Class Codes: G02B 7/021 for more than one lens

Abstract

A lens made of at least one of a resin and glass includes a lens effective diameter area, a peripheral area formed integral with the lens effective diameter area and located at a periphery of the lens effective diameter area, and at least one marker area located in the peripheral area and formed on a circle whose center is a center of the lens effective diameter area.

Claims

1. A lens made of at least one of a resin and glass, having:

a lens effective diameter area;

a peripheral area formed integral with said lens effective diameter area and located at a periphery of said lens effective diameter area; and

at least one marker area located in said peripheral area and formed on a circle whose center is a center of said lens effective diameter area.

2. A lens according to claim 1, wherein said marker area is a circle whose center is said center of said lens effective diameter area or a recess or a projection which is a part of said circle.

3. A lens according to claim 1, wherein said marker area includes independent small lens shapes.

4. A lens according to claim 1, wherein said lens is a combination lens acquired by combining a plurality of lenses.

5. A lens according to claim 1, wherein said lens has a lens-barrel having a lens seat portion which supports said lens and at which an indication marker area at least partially aligned with a circle whose center is said center of said lens effective diameter area is provided.

6. A method of producing a lens having a lens effective diameter area and a peripheral area formed integral with said lens effective diameter area and located at a periphery of said lens effective diameter area, comprising the steps of:

forming, together with said lens effective diameter area and said peripheral area, a lens made of at least either a resin or glass and having at least one marker area located in said peripheral area at said periphery of said lens effective diameter area and formed on a circle whose center is a center of said lens effective diameter area;

preparing a cooperative member having an indication marker area at least partially aligned with a circle whose center is said center of said lens effective diameter area; and

aligning said marker area with said indication marker area and fixing said lens to said cooperative member.

7. A method according to claim 6, wherein said marker area and said indication marker area are circles whose centers are said center of said lens effective diameter area or recesses or projections which are parts of said circles.

8. A method according to claim 6, wherein said marker area and said indication marker area are positioned in contact with each other.

9. A method according to claim 6, wherein said at least one marker area has independent small lenses which are positioned in such a way that when said center of said lens effective diameter area coincides with a predetermined optical axis, an image of said indication marker area is observed through said small lenses from a predetermined position on said optical axis.

10. A method according to claim 6, wherein said cooperative member is a lens or a lens-barrel.