US PATENT SUBCLASS 356 / 124
LENS OR REFLECTIVE IMAGE FORMER TESTING


Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

124LENS OR REFLECTIVE IMAGE FORMER TESTING {3}
124.5  DF  .~> For optical transfer function
125  DF  .~> Focal length measuring {1}
127  DF  .~> Optical center, cylinder axis, or prism measuring or determining


DEFINITION

Classification: 356/124

(under the class definition) Subject matter for measuring or otherwise determining the optical properties of a lens or reflective image former.

(1) Note. Measuring means for establishing lines or points on a lens blank for the purpose of grinding or cutting are not included in this subclass. However, means for determining the optical center or the cylinder axis of a finished lens would be classified here. The former subject matter is classified in Class 33, if the measurement is made mechanically; or in other subclasses of this class particularly subclasses 138+ and 372+, if significant optical features are involved.

(2) Note. Subject matter for visually inspecting a lens for flaws or imperfections is excluded from this subclass. Such subject matter is classified in subclass 239.

(3) Note. The subject matter of this subclass involves testing lenses or reflectors having curved surfaces. For flatness testing generally see subclass 371.

(4) Note. This subclass includes ophthalmic lens testing. However, Class 351 provides for eye testing and examination.

SEE OR SEARCH THIS CLASS, SUBCLASS:

359, for determining the surface configuration of a lens or reflector by means of light interference. SEE OR SEARCH CLASS

351, Optics: Eye Examining, Vision Testing and Correcting,

200+, for instruments for examining eyes or testing vision.