Medical headlamp optical arrangement permitting variable beam width

摘要

A medical headlamp having a front from which light is selectively emitted. The headlamp includes a beam origination portion that produces a light beam and an iris assembly, positioned in front of the beam origination portion, having a user accessible actuator and an iris, responsive to the actuator to block a user-selectable portion of the light beam. The iris is also responsive to the actuator to block none of the light beam, for maximum efficiency, when a user so selects.

主权项

1. A medical headlamp having a front surface from which a lamp light beam is emitted, comprising:
(a) a high efficiency light source producing a light beam; (b) an annular light block, defining an annulus and placed immediately in front of said high efficiency light source to block a peripheral portion of said light beam, thereby creating a crisp-boundary light beam extending from said light block; (c) an optical assembly, including a prime lens and an exit lens and positioned to receive light from said high efficiency light source and produce a lamp light beam emitted from said front surface of said lamp; (d) a housing supporting said light source and said optical assembly and an electrical conductor connected to said light source, for supplying electricity to said light source; and (e) wherein said optical assembly includes an adjustable iris assembly in front of said annular light block and including a user accessible actuator and an iris that is adjustable by said actuator, either to be retracted, thus leaving unaffected said crisp-boundary light beam from said light block, or to be tightened to block a portion of said crisp-boundary light beam from said annular light block, thus producing a thinner lamp light beam, said user adjustable actuator having a range of motion and said exit lens being moved backward or forward in response to said user accessible actuator, over at least a portion of said actuator's range of motion and wherein a portion of said actuator's range of motion moves said iris to block a variable portion of said light beam from said light block, and over said portion of said actuator's range said exit lens is not moved.