DE7005464U - LENS SUPPORT FOR A WRITING PROJECTOR. - Google Patents

Description

PATENT ADVOCATE

DiPL.-PHYS. DR. WALTHER JUNIUS 3 Hanover

ABBESTRASSE 20 TELEPHONE 83 45 30

January 30, 1970

Dr.j / Ha.

Heine file: U4 Klaus W. Beieer ft Co., 607 Langen, Langestrassβ 3-5 Lens carrier for a writing projector

The present invention relates to a lens mount for a writing projector, which consists of a plate attached to a support arm and located above the transilluminated writing surface, which plate has at least one lying lens and brackets for an axis carries on which a structural part consisting of a mirror, a standing lens and a cover hood can be pivoted is arranged

Such a lens carrier is known. For projection devices it is common practice that either only one Lens is provided for the projection device or for use in different sizes feokeelebjektivs are delivered, which j · after the Size of the tree as a whole lens inserted into the projector will·

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In the case of photographic apparatus there are interchangeable lenses in which the whole object is used against another is interchangeable, also auxiliary lenses to charge the Focal length, which are screwed in front of the object. In the case of photographic apparatus it is also known that lens parts also oppose other lens parts can be exchanged to change the focal length. Is can here but not very good due to the appearance prestigious auxiliary lenses and the replaceable lens parts inside only those parts of the objective be changed, which are facing the object. So far it has not been known that lens parts on the image side can be exchanged close.

Writing projectors are used in large numbers in schools. There the requirement occurs again and again on that the focal length of the lens must be changed so that the writing projector in the differently designed Classrooms, biology trees, physics trees and the like can be used. The exchange of whole Lenses is a very expensive proposition. Most schools are unable to take a series of. To acquire lenses according to the different room sizes.

Fixed invention avoids these laughable parts and creates a cheap way to change the lens focal lengths for a writing projector through a special Design of the lens carrier.

You Irfinduag is that at least one of the lying and / or standing lenses in one in the lens carrier retractable and removable or foldable holder is arranged

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While the professional world has so far shied away from making the image-side ob jelct ir parts interchangeable, it is a gate part the goal-lying invention that just the one for the escape particularly favorable lens parts on the image side are interchangeable. Since in the present invention the Objectirteile are no longer screwed, like that in the case of additional lenses, for example in the case of photographic ones Apparatus which is Pail is much easier to use given when changing lenses or lens parts.

It is useful if the sliding and removable Lens holder is a rectangular one-piece frame. then is namely an exact position of the lens in the Objektir guaranteed and particularly easy handling is ensured.

It is advantageous if separate lifting frames are used for the Sinso lifting frame Storage cassettes can be provided. Secure the rectangular sinso lifting frames and storage cassettes, that the lenses bsw. Lens parts both during use and during storage β deaf icher housed are.

Its another way of doing the present Invention is that the joints of the folding lens holder are designed and arranged so that a Pivoting out of the lens plane into a parallel plane to the side wall of the cover is possible. This ensures that the lenses, when they are not in use, can be pivoted into such a position that they do not obstruct the beam path on the other side of the person operating the writing projector.

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For free accommodation of these foldable lenses, it is advantageous if the Covering hood lockable storage rooms for the hinged lenses are arranged

The reading of the present invention is based on a example shown in the drawing schema + isoh explained in more detail below. BS seigern

Yig. 1 a perspective view of the SehreibprοRektor

2 shows a section through the lens carrier ait inserted.

Pig. 3 shows a view from the front of an objective carrier with a foldable lens holder.

There is a post on the housing 1 of the writing projector 2 attached to which »a sliding arm 3 for the Lens carrier 4 is arranged. The lens carrier 4 has a mirror 6 in its housing 5. A lens 7 is arranged on the underside of the housing 5 on the front side of the housing · 5 a lens 8 is arranged · Si ··· both bars 7 and 8 are in rectangular Sineohubrahmem 9 housed, which can be inserted into the guides 10, which are housed in the housing 5. This one can be used Lenses are shown in Figure 2

Another option for the lens carrier

is shown in Fig. 3: Here the lens 7 is arranged foldable. It is shown how the one lens 7a in the the drive position is folded, while the lim »· 7b is in the storage position · the · brackets. 11a i-r.wi 11b can be folded around joints 12a and 12b.

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Sa these brackets 11a uirf * rib are also rectangular - tie lenses 7a and 7b are tob. outside tob. not visible on the side and therefore only indicated by etched lines in the drawing - it has a very good dust seal. This is because the walls of the brackets lay tightly against the underside of the specimen slide 5 when the lenses are in the working position. For dust-free storage of the lenses in the storage partitions, hinged legs 14 are provided around the axis 13.

Claims (5)

- 6 solidarity claims: 1. Lens carrier for a writing projector, which consists of consists of a plate attached to a support arm and located above the transilluminated writing surface, which carries at least one horizontal lens and mounts for an axis on which a mirror and a cover hood existing structural part is pivotably arranged, which also has a standing lens may have characterized, that at least one of the lying lenses (7) and / or standing lenses (8) in one in the lens carrier (5) slidable and removable or foldable holder (9) is arranged. 2. Lens carrier according to claim 1,
characterized, that the sliding and removable lens holder (9) is a rectangular slide-in frame. 3 lens carrier according to claims 1 and 2, characterized, that separate storage cassettes are provided for the slide-in frame. 4. Lens carrier according to claim 1,
characterized, that the joints (12) of the foldable lens holder (11) are designed and arranged so that pivoting from the lens plane into a plane parallel to the side wall of the cover (5) is possible. 5. Ob3 «ktlTtrS« er aaeh Aneprueh 1 ua * 4, aa Since »the Ab4 * okhaub · (5) Äoee for Al «foldable ·» Li (11) tea Llaa «a (7) aag« oria «t ·!» *.