Carl-zeiss-stiftung

Carl-zeiss-stiftung, Heidenheim/brenz

Wolfgang Grimm

Hermann Schurle

Heinz-Wilhelm Paysan

Hans Gaiser

Heinz Gutbrod

Hubert Bammert

Hartmut Mennicke

An image display system comprises polarization spectacles having different polarization axes with or without .lambda./4-foils of both polarization lenses forward of the eyes of the person to be tested. The system of the invention further includes an image display device for generating light with a specific direction of polarization or a specific rotational direction of the circularly polarized light. The image display device comprises essentially at least one vectograph film and at least one image screen. This arrangement can so influence the light coming from the image screen that test figures or parts thereof can be seen by only one eye or by both eyes. If the image display system is to be used as a vision testing system and the test figures are to be changed, then there is a corresponding command of a drive circuit via a memory. The drive circuit drives the image screen in a suitable manner. A color display can be provided by making an appropriate modification to the image display device.

Vision testing system for stereoscopic viewing by a test person

A vision testing system includes polarization spectacles having different polarization axes with or without .lambda./4 filters for the two polarization lenses forward of the eye of the patient to be tested. This system also includes a vision testing apparatus for generating light having a specific polarization direction. The vision testing apparatus includes essentially two polarization filters and two LCD-displays which are mounted alternately one behind the other. This arrangement can so influence the light coming from the light source that test figures or portions of the test figures can be seen by one eye or by both eyes. If a test figure is to be changed, then a corresponding command is issued via a key pad to a switching unit which drives two drive circuits of the two LCD-displays in a desired manner. By making appropriate modifications of the vision testing apparatus, a patient can be tested as to color-vision acuity.

Vision testing system for testing the sight function of a patient

Anti-laser protective spectacles

Laser-protection spectacles

A safety spectacles against laser radiation has a first frame part which is of integral construction and in which shields are integrated, which cover the area between the frame and the spectacle-wearer's face. This frame part is also drawn over the spectacle-wearer's temple area and forms temple plates. Fitted pivotably to these temple plates are side arms which are each integrated in a further plate which forms the continuation of the associated temple plate.

Safety spectacles against laser radiation

An arrangement for machining material by means of a laser beam includes a laser and an exit window mounted between the laser and the workpiece to be machined. The exit window is made of a highly-interlaced plastic to substantially prevent a contamination of the window by means of material splatterings during the machining operation. The highly-interlaced plastic has a high elasticity in microscopic regions. Such a window made, for example, from allyldiglocylcarbonate has a long service life which extends to several days in automatically operating equipment for spot welding with a laser beam.

Arrangement for machining a workpiece by means of a laser beam

Laser safety eyeglasses include two protective filters for protecting the eyes against radiation from a laser. The eyeglasses include a frame having a main body defining two rims for accommodating the respective protective filters therein. Metal shielding plates are attached on the upper side of the frame as well as at the hinge ends of both mounting arms. The shielding plates stretch across the respective free regions between the frame and the face of the user. The mounting rims in which the protective filters are received as well as their connecting bridge are at least partially made of the same metal as the shielding plates.

Laser safety eyeglasses

The invention concerns a method and apparatus for testing aspherical lenses, particularly continuous-focus eyeglass lenses. The negative picture (7) of a test pattern (1) is produced by means of a master lens (4) which is placed in the ray path of the optical system (6) of the testing device. (FIG. 1). Thereupon the negative picture is projected back onto the test pattern over said ray path, which is now traversed in the opposite direction. If the specimen to be tested is now substituted for the master lens, light edges appear in the plane of the test pattern and give information as to the deviations of the distribution of the refractive power of the test specimen from the desired values of the master lens.

Method and apparatus for testing lenses

A device for rapidly demonstrating the darkening action of phototropic objects, particularly eyeglasses. The device has a housing or casing provided in its lower part (6) with a hollow space (7) which is placed over the objects to be demonstrated (8, 9) while such objects lie on any suitable horizontal supporting surface such as a table or desk. These objects are uniformly illuminated by a flash tube emitting light in the UV-A range and in the visible range. Upon each actuation of the circuit controlling the flash tube a plurality of flashes which succeed each other at a predetermined time interval is automatically given off.

Growing community of inventors

Heidenheim, Germany

Wolfgang Grimm