DE301962C - - Google Patents
Info
- Publication number
- DE301962C DE301962C DENDAT301962D DE301962DA DE301962C DE 301962 C DE301962 C DE 301962C DE NDAT301962 D DENDAT301962 D DE NDAT301962D DE 301962D A DE301962D A DE 301962DA DE 301962 C DE301962 C DE 301962C
- Authority
- DE
- Germany
- Prior art keywords
- double focus
- distant
- near part
- glass
- focus glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011521 glass Substances 0.000 claims description 9
- 230000003287 optical Effects 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 2
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
Landscapes
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Eyeglasses (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
Die vorliegende Erfindung bezieht sich auf ein Doppelfokusglas, das von den Hauptblickrichtungen für die Ferne und für die Nähe in den Linsenscheiteln senkrecht durchstoßen wird. Dabei ist vor allem darauf Wert gelegt worden, daß das Glas sich in der äußeren Form an die allgemein üblichen Doppelfokusgläser anschließt, indem es aus einem Hauptfernteil und einem unteren segmentartig angeschliffenen Nahteil besteht, dessen Krümmungen beide von denen des Fernteiles verschieden sind.The present invention relates to a double focus lens viewed from the main viewing directions For the distance and for the near, pierce vertically in the vertices of the lens will. It was particularly important that the glass is in the outer Form connects to the commonly used double focus glasses by making it from a main distant part and a lower, segment-like ground near part, the curvatures of which both are different from those of the distant part.
Die neuen Doppelfokusgläser unterscheiden sich von den bisher -allgemein üblichen dadurch, daß sowohl Vorder- wie Hinterfläche einen besonderen Schliff für den Nahteil erhalten, derart, daß die beiden optischen Achsen sich im Augendrehpunkt kreuzen.The new double focus lenses differ from the previously common ones in that they that both the front and rear surfaces receive a special cut for the near part, such that the two optical axes cross at the center of the eye.
Fig. ι zeigt ein Doppelfokusglas der bisher üblichen Art; die optische Achse M1 M3 des Nahteils geht hier nicht durch den Augendrehpunkt A. Fig. Ι shows a double focus glass of the previously usual type; the optical axis M 1 M 3 of the near part does not go through the center of rotation A here .
Unter Beibehaltung derselben Radien müßte das Glas, um in optischer Hinsicht vollkommen zu sein, so konstruiert werden, wie Fig. 2 zeigt; hier liegt der Punkt A auf der optischen Achse M3 M4 des Nahteils. Um das zu erreichen, hat auch die Vorderseite des Glases einen besonderen Einschliff erhalten, und zwar mit abgesetzter Trennungslinie.While maintaining the same radii, in order to be optically perfect, the glass would have to be constructed as shown in FIG. 2; here the point A lies on the optical axis M 3 M 4 of the near part. To achieve this, the front of the glass has also received a special cut, with a separate dividing line.
Aus ästhetischen Gründen ist es wünschenswert, daß an der Vorderfläche des Glases der Übergang vom Fernteil zum Nahteil möglichst wenig auffällt. Man legt deshalb die Radien der Vorderfläche zweckmäßig so, daß der Be- · grenzungskreis des Nahteils zugleich die Schnittlinie der beiden Kugelflächen darstellt. Fig. 3 zeigt ein derartiges Glas.For aesthetic reasons, it is desirable that the The transition from the far part to the near part is as little noticeable as possible. That is why the radii are laid of the front surface expediently in such a way that the boundary circle of the near part is at the same time the line of intersection of the two spherical surfaces. Fig. 3 shows such a glass.
Auf diese Weise läßt sich die Trennungslinie bei allen positiven und negativen Glä- sern — in jedem Falle wenigstens an einer Fläche ·— möglichst unsichtbar machen.In this way, the dividing line can be drawn for all positive and negative sern - in any case at least on one surface - make it as invisible as possible.
Durch die neue Schleifart ist die Herstellung von Doppelfokusgläsern ermöglicht, bei denen Fern- oder Nahteil oder auch beide punktuell abbildend sind.The new type of grinding enables the production of double focus glasses, in which Far or near part or both are selectively imaging.
Claims (2)
Publications (1)
Publication Number | Publication Date |
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DE301962C true DE301962C (en) |
Family
ID=555793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT301962D Active DE301962C (en) |
Country Status (1)
Country | Link |
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DE (1) | DE301962C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1135679B (en) * | 1956-04-13 | 1962-08-30 | Bozena Marie Phillips | One-piece bifocal spectacle lens and process for its manufacture |
US6199984B1 (en) | 1999-03-17 | 2001-03-13 | Johnson & Johnson Vision Care, Inc. | Progressive addition lenses with varying power profiles |
-
0
- DE DENDAT301962D patent/DE301962C/de active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1135679B (en) * | 1956-04-13 | 1962-08-30 | Bozena Marie Phillips | One-piece bifocal spectacle lens and process for its manufacture |
US6199984B1 (en) | 1999-03-17 | 2001-03-13 | Johnson & Johnson Vision Care, Inc. | Progressive addition lenses with varying power profiles |
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