DE4116501C1 - Spectacle tester verifying optical axes of glasses - uses rectangular transparent pane with 30 very fine, parallel lines and aligning socket - Google Patents

Abstract

The appts. for checking the optical axes of single focus, bi-focal and progressive type spectacle lenses and also the symmetry of their setting in the spectacle frame has a baseplate (2) to which a transparent rectangular glass or acylic plate (1) is attached. The plate (1) is inscribed with a series of 25 to 30 fine horizontal lines spaced at approx. 2mm intervals together with a central vertical line. A pair of soft transparent pack (3) of silicone type material is attached to the plate (1) to protect the lenses from scratching during their examination. USE/ADVANTAGE - Provides a simple portable and inexpensive means of ensuring optical accuracy in finished product. Ensures that lenses are well protected from accidental damage during checking.

Description

The invention relates to a device for checking the optical axis for single vision and progressive glasses, as well as the near parts of bifocal glasses and the Frame symmetry of glasses frames, especially in the First fitting of optical glasses in glasses frames and the repair of optical vision aids.

It is for the proper functioning of optical vision aids indispensable that the optical axes of the correction glasses on the position of the pupils of the wearer are matched and that in the case of progressive glasses in particular, the course of the inlet or Decrease in the refractive index of the two glasses on one common horizontal axis.

The orientation of the axis symmetry is also important the frame symmetry.

There are already various devices for the above Purpose known. However, these are either extremely complex and usually include many functions that are necessary for fitting the Lenses or the control of symmetry are irrelevant, like for example measuring patient-specific measurements.

This means that the devices are either non-transportable or are too expensive to look at any job Operators to be available once.

For example, from US Pat. No. 4,196,978 a device known, the aforementioned Applications allowed, but also all the disadvantages mentioned above united in itself and also when measuring the optical visual aids do not provide adequate protection against the Scratching the glasses offers.  

The inventor has set the goal of a device in Find an easy-to-use scale, which avoids the aforementioned disadvantages and a problem-free one and ensures easy use, as well as by a low price can find widespread use.

The invention has for its object a scale find who can both check the axis of Single vision and progressive lenses as well as the near parts Bifocal lenses as well as for checking the frame symmetry is suitable, whereby scratching of the glasses is excluded.

In order to achieve this object according to the invention, a rectangular, transparent disc, preferably made of glass or acrylic glass ( FIG. 1), is used, which has approximately thirty parallel, horizontally aligned lines, as well as supports made of a transparent, soft material ( 3 ) is provided.

The aforementioned lines have a maximum distance of two Millimeters and are to achieve a high reading accuracy as fine as possible.

Parallel to these lines, a rectangular base ( 2 ) is attached to the lower end of the lens, which serves as a support for the glasses frame and is connected to the lens ( 1 ) by screwing, gluing or welding.

The base is made for dimensional reasons strength, stability and ease of manufacture Aluminum or another comparable material.

It is also conceivable to manufacture the disc ( 1 ) and the base ( 2 ) from one piece. In this case, the material used for manufacturing is preferably a transparent plastic.

In various experiments with different forms of execution of the device it has been found that to achieve an accurate and high-contrast reading as the base material for disk ( 1 ), plastics with light guide properties are particularly suitable. The material FLUKO (Registered Trademark) is mentioned here as an example of this embodiment.

The choice of the embodiment used is the produkti ontechnical and application-specific conditions do not limit or limit the invention in any way.

Furthermore, there is at least one line on the disc ( 1 ) which extends at an angle of 90 degrees to the base ( 2 ) and the other lines applied.

If only one line is used, this is designed as a center right and divides the disc ( 1 ) into two halves of equal size.

Depending on the intended use of the scale, it can be useful several measuring lines, at an angle of 90 degrees to the base bleeding to use. This may seem useful if the pupil distance is also included as a measured variable.

In order to avoid optical distortions, all of the measuring lines provided are applied directly to the side of the pane ( 1 ) to which the base ( 2 ) is attached and the spectacle frame is attached for the measurement. This leads to a much higher reading accuracy.

The lines are applied by customary methods such as screen printing, engraving or etching.

Furthermore, there are two silicone-like pads ( 3 ) on the lens ( 1 ), which protect the lenses of the glasses frame against scratching. This is particularly important when using plastic glasses.

The pads ( 3 ) are made as thin as possible to ensure the greatest possible proximity to the scale level and transparent so as not to impede a reading.

To clarify the mode of operation of the device, an application example will be given below.

A glazed or unglazed spectacle frame to be checked is placed on the base ( 2 ) and brought into contact with the lens ( 1 ) or support ( 3 ).

Any asymmetries in the arrangement can be easily identified and eliminated with the aid of the parallel lines on disc ( 1 ).

Likewise, the correct fit and the fit of optical glasses in the glasses frame by comparing the Course of the markings made by the glass manufacturer be checked with the measuring lines.

Claims (7)

1.Device for checking the optical axis of single vision and progressive lenses, as well as the near parts of bifocal lenses and / or the frame symmetry of glasses, consisting of a square-shaped support plate ( 2 ) serving to hold an eyeglass frame and one on the support plate ( 2 ) The transparent, rectangular disc ( 1 ), which is arranged perpendicular to its support surface, is provided with fine lines running parallel to the support surface and to one another and at least one line running perpendicular to this, such a vertical line (center line) dividing the disc ( 1 ) into two Halves divides, and on the disc ( 1 ) two silicone-like or made of another soft and transparent material pads ( 3 ) are attached, which are located on both sides of the center line and preferably 30 mm from it. 2. Device according to claim 1, characterized in that the support ( 2 ) with at least three sides flush with the disc ( 1 ) cuts off. 3. Device according to claim 1, characterized in that the lines located on the disc ( 1 ) have a maximum distance of two millimeters and have a minimum number of 25, preferably 30. 4. Apparatus according to claim 1 to 2, characterized in that the support ( 2 ) with the disc ( 1 ) by screwing and / or gluing and / or welding is connected, or that disc ( 1 ) and support ( 2 ) from one piece, or is manufactured. 5. Apparatus according to claim 1 to 4, characterized in that the disc ( 1 ) consists of a transparent material which has light guide properties and / or is colored transparent. 6. The device according to at least two claims 1 to 5, characterized in that the lines located on the disc ( 1 ) are applied to the side of the disc on which the supports ( 2 and 3 ) are attached and that the application of these lines by etching and / or embossing and / or printing and / or engraving. 7. The device according to at least one of claims 1 to 6, characterized in that the base ( 2 ) serving as a support is provided with suction cups which allow reversible attachment to a smooth surface.