Single focus compound lens and mold

• US 20060073231A1
• Filed: 11/07/2003
• Published: 04/06/2006
• Est. Priority Date: 03/20/2003
• Status: Active Grant

• Current Assignee: Hyun-Soo Joe
• Original Assignee: Hyun-Soo Joe
• Inventors: Joe, Hyun-Soo
• Granted Patent: US 7,278,735 B2
• Time in Patent Office: Days
• US Class Current: 425/406
• CPC Class Codes: B29D 11/00028 Bifocal lenses; Multifocal lenses
• CPC Class Codes: B29D 11/00528 Consisting of two mould halves joined by an annular gasket
• CPC Class Codes: G02C 7/02 Lenses; Lens systems ; Methods of designing lenses
• CPC Class Codes: G02C 7/06 bifocal; multifocal ; progressive G02C7/041 takes precedence

Abstract

Disclosed is a single focus compound lens and a mold for manufacturing the single focus compound lens, where the single focus compound lens has a reading far point diopter lens and a reading near point diopter having different diopters that are integrally molded to have the same optical central point and the mold has the two divided areas with respect to the optical central point, each of the two areas forming an inner peripheral surface having a difference in curvature and thickness corresponding to the diopter difference, such that near distance works like reading or doing with a computer can be accomplished without any trouble and the fatigue of eyes caused due to the failure of correspondence of focuses can be prevented.

Claims

1. A single focus compound lens comprising a reading far point diopter lens and a reading near point diopter lens having a diopter difference in a range between 0.3 diopter and 1 diopter therebetween, the reading far point diopter lens and the reading near point diopter lens being integrally molded in such a manner that their focuses correspond to each other.

2. A single focus compound lens according to claim 1, wherein a diopter difference between the reading far point diopter lens and the reading near point diopter lens is 0.5 diopter.

3. A single focus compound lens according to claim 1, wherein the diopter difference between the reading far point diopter lens and the reading near point diopter lens compensates for a difference in curvature and thickness between the two lenses with respect to the single focus.

4. A mold for manufacturing a single focus compound lens, the mold comprising:

an upper support plate forming the inner face of the lens and a lower support plate forming the outer face of the lens, each of the upper support plate and the lower support plate forming an inner peripheral surface having a difference in curvature and thickness corresponding to a diopter difference for two divided areas with respect to an optical central point.

5. A mold for manufacturing a single focus compound lens according to claim 4, wherein any one of the upper and lower support plates that is arbitrary selected forms the inner peripheral surface having a difference in curvature and thickness corresponding to the diopter difference.

6. A mold for manufacturing a reading single focus compound lens according to claim 4, wherein both of the upper and lower support plates form the inner peripheral surfaces each having a difference in curvature and thickness, such that the differences in curvature and thickness between the upper and lower support plates are added to become the difference in curvature and thickness corresponding to the diopter difference.