DE102011056459B4 - Method for producing a lens attachment for generating reflections and lens attachment for generating reflections - Google Patents

Abstract

Method for producing an objective attachment (1) for generating reflections (3), comprising the following steps: - providing a transparent pane (2); - providing a frame which closely surrounds the pane around its circumference and protrudes perpendicularly from the pane plane - Applying an adhesive layer (4) to the pane, the adhesive layer not being able to flow off due to the frame, but being evenly distributed over the pane; - Inserting objects (5) into the adhesive layer; - Freeing the adhesive layer of air bubbles; - Application a transparent cover pane (6), so that the adhesive layer with the objects located therein lies between the two panes; and removing the frame.

Description

TECHNICAL FIELD

The present invention relates to lens attachments for producing reflections, particularly in response to light sources in a photographed object.

BACKGROUND AND PRIOR ART

Numerous lens attachments are known with which the image with which a photographic film is exposed can be influenced. These attachments are arranged either in front of a photo lens or between the lens and the camera. There are filters for absorbing unwanted radiation such as UV or skylight filters, filters for filtering out reflections such as polarizers, filters for influencing the color temperature and filters for enhancing the contrast between certain color areas of a photographic subject such as yellow, red and green filters in black and white -Photography. In cinema technology, lens attachments are often used that generate additional effects - e.g. soft focus or so-called star effect filters. The latter usually have glass panes with engravings that create reflections if the object depicted contains lights. Such star-effect filters are mentioned, for example, in the “COKIN Creative Filter System (July 2002)” catalog on page 13 ff. However, they have several disadvantages - in particular that, due to the nature of the glass engravings, they only produce reflections of the same color as the lights.

The DE 20 50 652 A discloses an objective filter for generating diffraction images in optical images. For this purpose, multi-layer strips of interference coatings are vapor-deposited onto a transparent filter holder. The purpose of this filter is to create a diffraction effect that only occurs for a specific color. In this way a sequence of images of a light source is obtained, the colors of which - in contrast to conventional diffraction gratings made of wire - can be predetermined. Since the goal of the DE 20 50 652 A If diffraction is to be restricted to certain colors, a device with vapor-deposited interference coatings is required, which cannot easily be adapted to different camera / lens equipment.

The EP 1 672 419 B1 the applicant discloses a lens attachment for generating reflections in response to light sources in an object to be photographed with a frame which can be attached to a camera lens in the plane perpendicular to its optical axis and has a reflex device, the reflex device consisting of threads or filaments which are stretched in the frame over the camera lens and generate reflections at right angles to their direction of extension. The possibilities with regard to the geometric shapes that can be generated in the lens plane with the threads are limited: Since the threads are clamped in the frame, straight figures can at best be generated - curvatures are not possible.

The DE 101 37 477 A1 discloses an optical camera filter for compensating for stray light on foreground objects. The filter has several levels, which comprise two optically pure glass or plastic panes provided with different colors and structures, as well as a plastic film with correction color and cast-in silver particles in between.

The U.S. 4,713,477 A discloses a filter which, in addition to the actual filtering, also serves to generate electrical energy that is obtained from the light absorbed by the filter. The filter comprises two sheets of glass and an adhesive layer between them.

SUMMARY OF THE INVENTION

An object of the present invention is an objective lens attachment for generating reflections in response to light sources present in a photographed object which overcomes the disadvantages of the prior art. The present invention is directed to a lens attachment that is more versatile and allows the creation of reflections that were previously not possible. In addition, the lens attachment is easy to manufacture.

This can be achieved with a method for producing an objective attachment according to claim 1, the method according to the invention comprising the following steps: providing a transparent pane; Providing a frame which closely surrounds the disc around its periphery and protrudes perpendicularly from the plane of the disc; Applying an adhesive layer to the pane, the adhesive layer not being able to flow off due to the frame, but being distributed evenly over the pane; Introducing objects into the adhesive layer; Removing air bubbles from the adhesive layer; Applying a transparent cover pane so that the adhesive layer with the objects located therein lies between the two panes; and removing the frame.

This is also achieved with an objective attachment according to claim 12, the objective attachment according to the invention comprising two transparent panes and an adhesive layer located between them, into which objects are introduced.

Other advantageous features of the method and of the objective attachment are disclosed in subclaims 2-11 and 13-20, respectively.

Figure list

• 1 shows the general concept of the lens attachment according to the invention in an oblique view based on a first embodiment;
• 2 shows a possible application of the lens attachment of 1 ;
• 3a / b show the reflections caused by a light source in the first embodiment;
• 4th shows by way of example some reflections that arise from a light source in a second embodiment:
• 5 shows by way of example some reflections which arise in a third embodiment by a light source; and
• 6th shows by way of example some reflections that arise in a fourth embodiment from a light source.

DESCRIPTION OF THE PREFERRED EMBODIMENT

The 1 and 2 show the general structure and application of the objective attachment according to the invention 1 . It consists of two transparent panes 2 , 6th between which there is a layer of adhesive 4th located in the objects 5 are introduced. The objects can be, for example, thin threads wrapped in a circle, as in 1 to see.

The disks 2 , 6th can be made of glass, but plastics are also possible. For example, a UV-curing or silicone adhesive can be used for the adhesive layer - in any case it must be an adhesive that has good optical properties in that the image quality is not significantly impaired by the lens attachment. In this context, the thickness of the adhesive layer is also important: a thickness of 0.2-3 mm has proven to be suitable. The threads can be, for example, transparent nylon threads that are treated with transparent blue varnish. In addition to the in 1 The threads shown wound in a circle can also be used for other objects in other geometric shapes, such as glass, metal or plastic parts, which already have a certain geometric shape such as ovals or polygons or can be arranged in such (see 5 and 6th ).

The manufacture of the lens attachment according to the invention 1 is as follows. First is a transparent disc 2 placed on a horizontal surface. Then around the disc 2 arranged around a frame (not shown) which closely surrounds the pane and protrudes upward from the plane of the pane. The purpose of this frame is to have a layer of glue 4th on the disc 2 can be applied, which does not run down the side of the disc, but remains in a certain thickness on the disc. Objects are then placed in the adhesive layer 5 - such as nylon threads - introduced. After inserting the objects, the adhesive layer becomes 4th - For example under vacuum - any air bubbles that may be contained therein are removed in order to minimize optical losses. After that the adhesive layer 4th with the objects in it 5 closed from the outside by using a transparent cover plate 6th is provided - which is put on by tilting, for example, so that air can escape. Finally the frame is removed.

The lens attachment is in use 1 in front of the lens 7th the camera 8th in the plane perpendicular to the optical axis ( 2 ) held. In this way the camera lens “sees” through the one with the objects 5 provided lens attachment through onto the depicted object 9 - in the case of 2 a motor vehicle.

The 3a / b - 6 show the corresponding reflections caused by light sources present in the depicted object 10 arise. Contains the pictured item 9 as in the case of the 2 For example, switched on car headlights generate these light sources 10 Reflexes 3 that in the case of threads 5 run at right angles to their direction of extension - 3a and 3b show the corresponding reflections for the first embodiment, in which a circularly wound thread 5 into the adhesive layer 4th has been introduced.

4th shows, by way of example, some of the reflections that arise in a second embodiment in which several circularly wound threads have been introduced into the adhesive layer.

5 and 6th show by way of example some of the reflections that arise in a third and fourth embodiment in which geometrically different objects are distributed in a disorderly manner ( 5 ) or similar elongated objects in orderly lines ( 6th ) have been introduced into the adhesive layer.

As the objects 5 are arranged close to the camera lens, they are not shown on the film and are therefore in the 3a / b - 6 also not shown.

As already stated above for conventional star-effect filters, reflections arise in response to lights present in the object shown at right angles to the direction in which the devices generating the reflections extend. In the case of the 1 , 3a / b and 4 these are the reflexes 11 generating devices around the threads wound into a circular shape 5 . They create horizontal reflections in the form of short lines (about 2 mm) at right angles to each thread 5 . Continue to cover the threads 5 the lens surface does not necessarily completely, but can be arranged in the desired areas of the same, so that the reflex effect then only appears in these areas - in 3a / b and 4 show arrangements with only one wound thread or with many wound threads distributed over the entire area.

As can be seen, this lens attachment - in contrast to the attachments according to the prior art - can be adapted to requirements of all kinds while being simple to manufacture: On the one hand, threads can be used which, by positioning them in an adhesive layer, can be formed into geometrical figures in a wide variety of ways; on the other hand, completely different objects than just threads can now be used for the first time, which expands the scope many times over, since these objects can already have certain geometric shapes themselves. The lens attachment according to the invention is therefore extremely versatile and can be produced for different camera lenses and purposes.

The lens attachment according to the invention can be used on any digital or analog photo, video or film cameras.

It should be emphasized that the above-mentioned embodiments of the present invention describe them only by way of example. Numerous alternatives lie within the scope of the invention as defined in the appended claims. E.g. can the lens attachment 1 even behind the lens 7th , ie between this and the camera 8th be arranged. Furthermore, other and / or differently shaped objects than those specified in the description above can be incorporated into the adhesive layer.

Claims (20)

A method for producing a lens attachment (1) for generating reflections (3), comprising the following steps: - providing a transparent pane (2); Providing a frame which closely surrounds the disc around its circumference and protrudes perpendicularly from the plane of the disc; - Application of an adhesive layer (4) to the pane, the adhesive layer not being able to flow off due to the frame, but being distributed evenly over the pane; - Introducing objects (5) into the adhesive layer; - Freeing the adhesive layer of air bubbles; - Application of a transparent cover pane (6) so that the adhesive layer with the objects located therein lies between the two panes; and - Remove the frame. Procedure according to Claim 1 , wherein the discs (2, 6) are made of glass. Procedure according to Claim 1 or 2 , wherein the adhesive (4) is a UV-curing or a silicone adhesive. Method according to one of the preceding claims, wherein the thickness of the adhesive layer (4) is 0.2-3 mm. Method according to one of the preceding claims, wherein the adhesive layer (4) is freed from air bubbles under vacuum. Method according to one of the preceding claims, wherein the cover plate (6) is tilted up so that air can escape. Method according to one of the preceding claims, wherein the objects (5) are transparent nylon threads. Procedure according to Claim 7 , the threads (5) being coated with blue transparent lacquer. Procedure according to Claim 7 or 8th , wherein the threads (5) are arranged in a circle. Procedure according to Claim 7 or 8th wherein the threads (5) are arranged in geometric shapes such as ovals or polygons. Method according to one of the Claims 1 - 6th , wherein the objects (5) are glass, metal or plastic parts. Lens attachment (1) for generating reflections (3), comprising two transparent panes (2, 6) and an adhesive layer (4) in between, into which objects (5) are incorporated. Lens attachment (1) Claim 12 , wherein the discs (2, 6) are made of glass. Lens attachment (1) Claim 12 or 13th , wherein the adhesive (4) is a UV-curing or a silicone adhesive. Lens attachment (1) after one of the Claims 12 - 14th , the thickness of the adhesive layer (4) being 0.2-3 mm. Lens attachment (1) after one of the Claims 12 - 16 , the objects (5) being transparent nylon threads. Lens attachment (1) Claim 16 , the threads (5) being coated with blue transparent lacquer. Lens attachment (1) Claim 16 or 17th , wherein the threads (5) are arranged in a circle. Lens attachment (1) Claim 16 or 17th wherein the threads (5) are arranged in geometric shapes such as ovals or polygons. Lens attachment (1) after one of the Claims 12 - 15th , wherein the objects (5) are glass, metal or plastic parts.

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