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Laser-spot-projector

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Laser spot projector

Details

Inventors: Nakanishi, Takaji; Hennings, David R.; Niino, Masao;
Assignee: Kowa Company Ltd. (Aichi, JP); Coherent Incorporated (CA)
Primary Examiner: Hindenburg; Max
Assistant Examiner:
Attorney, Agent or Firm: Adams; Bruce L., Wilks; Van C.

Disclosed is a laser spot projector for use with a laser coagulation system in which a laser beam is radiated as a focussed spot into a portion selected to be thermally coagulated. A laser source produces a laser beam, and a focussing lens focusses the laser beam on the selected portion in the form of a focussed laser beam spot. A variator lens is displaceably arranged between the laser source and focussing lens for changing the magnification of the laser spot depending upon the displacement of the variator lens. The variator lens is selectably displaceable to two separate positions where the image point is conjugated with the object point with respect to the variator lens. This arrangement makes it possible to selectably provide two focussed laser beam spots each having a different spot diameter.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a laser spot projector capable of easily adjusting the magnification of the laser spot projected on the portion to be thermally coagulated.
It is another object of the present invention to provide a laser spot projector capable of being made compact, and easy to manufacture.
A laser spot projector according to the present invention comprises a laser source for producing a laser beam, a focussing lens for focussing the laser beam on a selected portion in the form of a laser spot, and a variator lens displaceably arranged between the laser source and focussing lens for changing the magnification of the laser spot depending upon the displacement thereof.
The variatior lens is displaceable to a position such that object and image points of the variator lens lie at its conjugate points.
The variator lens is thus displaceable to a first position where a laser beam aperture at the object point is focussed to form the aperture image at the image point corresponding to one of the conjugate points of the variator lens, thus forming a laser spot having a first diameter.
The variator lens is also displaceable to a second position such that the conjugate point at which the image point lies is reversed to an object point of the variator lens.
Accordingly a laser spot having a second diameter different from the first diameter can be formed at the same image point.
Thus, the laser spot projector of the present invention makes it possible to provide two sizes of focussed laser spot each having a different spot diameter.
According to the preferred embodiment of the present invention, the variator lens is further displaceable to a position where the object or image point of the variator lens lies out of the conjugate points.
In this position, the laser spot can be adjusted to any magnification although the laser spot is not focussed.

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