GB2621543A

GB2621543A - Frame for displaying artwork

Info

Publication number: GB2621543A
Application number: GB2209956.8A
Authority: GB
Inventors: Stone Andrew
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2024-02-21
Also published as: GB202209956D0

Abstract

The frame 1, particularly for artwork 7, comprises a body 40 including a recess with a first surface 42 for a light source 13, the first surface angled at about 65° to 85° (preferably 75° to 80°) towards a plane of the artwork in use. The light source may include an addressable array of multiple (e.g., three) rows of LEDs. The first surface may be on a side frame 2, located between a front frame 4 and a back frame 3 with a recess 6 for the artwork. The front frame may be removably attached to the side frame, e.g., by a plurality of magnets. The body may define a double recess for hiding LED drivers and/or controllers. A diffuser 18 may be located between the light source and the artwork. The diffuser, optionally including a first part 19 of clear or opal acrylic and a second part 20 of opal acrylic with a quadrilateral profile, is also claimed separately.

Description

Frame for Displaying Artwork The present invention relates to a frame for displaying artwork. In particular, the invention relates to a frame having a profile for receiving a hidden light source which is capable of lighting the artwork substantially uniformly.

Background of the Invention

Placing artwork in direct sunlight exposes it to ultra violet and infrared light which can damage the artwork. Therefore, it is generally recommended to place artwork away from strong sunlight.

In view of this, it is known to use ceiling mounted lights, track lights, picture lights or spotlights to light artwork. However, they can look cluttered and detract for the aesthetic appearance of the artwork.

In addition, known lighting for artwork can result in overspill of light from the artwork into a surrounding. This can detract from the artwork.

In light of the problems discussed above, various proposals have been made, but there remains a need for an improved way of lighting artwork which addresses one or more of the problems presented by prior art arrangements. In this regard, the present invention seeks to provide an alternative which preferably addresses one or more of the problems presented by prior art arrangements.

Summary of the Invention

In accordance with a first aspect of the present invention there is provided a frame for displaying artwork, wherein the frame comprises a body including a recess having a recessed first surface for receiving a light source, the recessed first surface being inclined towards the plane of the artwork in use at an angle of about 65° to about 85° to the plane of the artwork.

Preferably, the recess has a rectangular cross section.

Preferably, the body defines an opening having a further recess for receiving and surrounding generally planar artwork.

Preferably, the recessed first surface is inclined towards the artwork at an angle of about 75° to about 800, most preferably about 80° to the plane of the artwork. Advantageously, it has been found that a light source positioned on this surface is angled so light reaches the centre of the artwork and is substantially evenly distributed across its surface.

Preferably, the frame comprises a light source in the recess. In one embodiment the light source abuts the recessed first surface.

Preferably, the light source includes at least one LED. Preferably, the light source is an LED tape or ribbon. Preferably, the LED is a high colour rendering index (CRI) LED. Preferably, the LED is a 98 or higher CRI LED.

Preferably, the frame comprises a heat sink between the light source and the recessed first surface. In one embodiment, the heatsink abuts the recessed first surface and the light source.

Preferably, the heat sink comprises a block of metal. Preferably, the metal is aluminium. Preferably, the block has a rectangular profile.

Preferably, the body has a second surface which in use is substantially parallel with the surface of the artwork.

Preferably, the body has a third surface projecting away from the artwork and inclined at an angle of about 25° to about 60° to the second surface.

Preferably, the third surface projecting away from the artwork is inclined at an angle of about 30° to about 50°, most preferably about 35° to the second surface. It has been found that this angle enables excellent lighting of the artwork from the light source.

Preferably, the body comprises a side frame located between a back frame and a front frame, the back frame defining an opening having a recess for receiving and surrounding generally planar artwork, the side frame having the recessed first surface for receiving a light source inclined towards the plane of the artwork in use.

Preferably, the back frame has the second surface which in use is substantially parallel with the surface of the artwork, and the third surface projecting away from the artwork.

In one embodiment, the frame is dimensioned for displaying an extra-large artwork and the recessed first surface has a width of at least about 75mm. Advantageously, it has been found that a light source positioned this distance from the artwork can be angled so light is substantially evenly distributed across the surface of the artwork.

In an alternative embodiment, the frame is dimensioned for displaying a large artwork and the recessed first surface has a width of about 65mm to about 75mm. Advantageously, it has been found that a light source positioned this distance from the artwork can be angled so light is substantially evenly distributed across the surface of the artwork.

In an alternative embodiment, the frame is dimensioned for displaying a medium sized artwork and the recessed first surface has a width of about 30mm to about 65mm. Advantageously, it has been found that a light source positioned this distance from the artwork can be angled so light is substantially evenly distributed across the surface of the artwork.

In an alternative embodiment, the frame is dimensioned for displaying a small artwork and the recessed first surface has a width of about 25mm to about 30mm. Advantageously, it has been found that a light source positioned this distance from the artwork can be angled so light is substantially evenly distributed across the surface of the artwork.

Preferably, a fourth surface is located between the second surface and the third surface, wherein the fourth surface is substantially perpendicular to the first surface. Preferably, the fourth surface has a width of about lmm to about 5mm, more preferably about 2mm to about 5mm, most preferably about 5mm.

Preferably, a fifth surface is provided wherein the recessed first surface is located between the third surface and the fifth surface, the fifth surface extending from adjacent the first surface so that the third surface and the fifth surface are inclined to each other at an acute angle.

Preferably, the fifth surface is parallel with the second surface or inclined to the second surface at an angle of up to about 10°. More preferably, the fifth surface is inclined to the second surface at an angle of up to about 5°.

Advantageously, the frame of the invention allows a light source, for example high quality LED tape or ribbon, to be completely hidden within the frame without affecting aesthetic appearance of the frame. In addition, the frame of the invention is capable of lighting the artwork substantially uniformly. In this regard, the light source is positioned and angled so light reaches the centre of the artwork and is substantially evenly distributed across its surface.

In addition, advantageously, the use of an LED light source emits almost no UV or infra-red light so the light source does not damage the art work.

In an embodiment, the frame is rectangular and defines a rectangular opening for displaying a rectangular artwork. In this regard, preferably, the frame has first pair of parallel sides and a second pair of parallel sides longer than the first pair.

In an alternative embodiment, the frame is square for displaying a square artwork. In this regard, preferably, the frame has first pair of parallel sides and a second pair of parallel sides of equal length to the first pair.

In an embodiment, the light source includes an addressable multi row LED array.

Advantageously, this enables the light to be spread effectively without the use of a diffuser. In addition, advantageously, being addressable, each individual LED can be controlled for brightness, warmth or colour if RGB.

In one embodiment, preferably there are three rows of LEDs in the LED array.

Preferably, different beam angles for each row of LEDs are provided. Alternatively or in addition, preferably, an optic over each LED is provided to achieve this.

Preferably, the number of rows of LEDs in the LED array is varied depending on the size of the surface to be lit.

Preferably, the body has front and side surfaces distant from the artwork which have a decorative profile. In one embodiment, the front surface is provided on the front frame and the side surface is provided on the side frame. Preferably the front and side surfaces have a plurality of projections and / or a plurality of indents.

Preferably, the frame includes a diffuser located between the light source and the artwork. Advantageously, the diffuser varyingly diffuses the light from the light source to create a substantially even light distribution across the art. Preferably, the diffuser is located adjacent the light source.

Thus, in accordance with a second aspect of the present invention there is provided a diffuser for use in displaying an artwork, wherein the diffuser has a first surface and a second surface having a distance there between, and the distance between the first surface and the second surface is not constant.

Preferably, in use, a light path is provided between the first surface and the second surface and the light is diffused more where the distance between the first surface and the second surface is greater. Therefore, in use, the distance between the first surface and the second surface of the diffuser is greater nearer to the plane of the artwork.

Preferably, in use, light from the light source is directed onto the first surface of the diffuser and travels along the light path from the first surface to the second surface of the diffuser. The light from the light source is thereby diffused by the diffuser.

In one embodiment, the first and / or second surface of the diffuser is curved.

In another embodiment, the diffuser comprises a first part and a second part, the first part of clear acrylic or opal acrylic having a quadrilateral profile and the second part of opal acrylic having a quadrilateral profile.

Preferably, in use, the first part of the diffuser is located between the light source and the second part of the diffuser.

Preferably, the first part of the diffuser has a trapezoid profile wherein the profile has a first surface for being located proximate to the light source, a parallel second surface longer than the first surface for being located distant to the light source, a third surface inclined at about 600 to about 70°, more preferably about 65° to the second surface and proximate to the plane of the artwork, and a fourth surface inclined at about SO to about 90°, more preferably about 84° to the second surface and distant to the plane of the artwork.

S

Preferably, the second part of the diffuser has a trapezoid profile wherein the profile has a first surface for being located proximate to the light source, a parallel second surface shorter than the first surface for being located distant to the light source, a third surface inclined at about 60° to about 700, more preferably about 65° to the second surface and proximate to the plane of the artwork, and a fourth surface inclined at about 120° to about 1300, more preferably about 127° to the second surface and distant to the plane of the artwork.

Preferably, the surfaces of the first and second parts of the diffuser are planar.

Preferably, the second surface of the first part of the diffuser is located to abut the first surface of the second part of the diffuser.

Preferably, the third surface of the first part of the diffuser and the third surface of the second part of the diffuser are aligned and coplanar.

Preferably, a longitudinal axis through the centre of the light source passes through the first part of the diffuser between the third surface and the fourth surface of the first part of the diffuser.

Preferably, an edge between the first surface and the fourth surface of the second part of the diffuser is located on a longitudinal axis through the centre of the light source.

Preferably, the diffuser is rectangular and defines a rectangular opening for displaying a rectangular artwork. Preferably, the diffuser has a first pair of parallel sides and a second pair of parallel sides longer than the first pair. Preferably, the first part of the diffuser is of clear acrylic along the full length of the first pair of parallel sides. Preferably, the first part of the diffuser is of clear acrylic for about the middle 60% of the second pair of parallel sides. Preferably, the first part of the diffuser is of opal acrylic at each end of the second pair of parallel sides. Preferably the first part of the diffuser is of opal acrylic for at least about 15% of the length of the second pair of parallel sides at each end thereof.

Advantageously, this has been found to diffuse the light from the light source at the edges of the artwork so that a visible line of light is faded.

In use, light is emitted from the light source and some light from the light source passes through only the first part of the diffuser, whereas other light from the light source passes through both parts of the diffuser.

Advantageously, the diffuser assists in lighting the artwork substantially uniformly.

Preferably, the front frame is removably attached to the side frame. Preferably, it is attached by a plurality of magnets and corresponding magnetic material. Advantageously, this enables the front frame to be easily removed for access for example for installation or changing the light source.

Preferably, a surface of the front frame facing the artwork is finished in mat black. Advantageously, this has been found to stop light reflection and to decrease any bright spots.

Preferably, the back frame defines a double recess to allow LED drivers / controllers to be hidden within the frame but still be easily accessible for wiring.

Brief Description of the Drawings

The invention will now be further described with reference to the accompanying drawings in which: Figure 1 shows the profile of a frame according to an embodiment of the invention; Figure 2, shows the profile of a diffuser according to an embodiment of the invention; and Figure 3 shows the results achieved by an embodiment of the invention. In this regard, Figure 3a shows the results achieved with the light source off, Figure 3b shows the results achieved with the light source having 50% brightness, Figure 3c shows the results achieved with the light source having 70% brightness, and Figure 3d shows the results achieved with the light source having 85% brightness.

Detailed Description of the Invention

It will be appreciated that aspects, embodiments and preferred features of the invention have been described herein in a way that allows the specification to be written in a clear and concise way. However, unless circumstances clearly dictate otherwise, aspects, embodiments and preferred features can be variously combined or separated in accordance with the invention. Thus, preferably, the invention provides a device having features of a combination of two or more, three or more, or four or more of the aspects described herein. In a preferred embodiment, a device in accordance with the invention comprises all aspects of the invention.

Within the context of this specification, the word "about" means plus or minus 20%, more preferably plus or minus 10%, even more preferably plus or minus 5%, most preferably plus or minus 2%.

Within the context of this specification, the word "substantially" means preferably at least 90%, more preferably 95%, even more preferably 98%, most preferably 99%.

Within the context of this specification, the word "comprises" means "includes, among other things" and should not be construed to mean "consists of only".

Within the context of this specification, an extra-large artwork has a length of at least about 1.4m and/or a width of at least about 1.4m Within the context of this specification, a large artwork has a length of about 1.0m to about 1.4m and/or a width of about 1.0m to about 1.4m.

Within the context of this specification, a medium sized artwork has a length of about 0.6m to about 1.0m and/or a width of about 0.6m to about 1.0m.

Within the context of this specification, a small artwork has a length of up to about 0.6m and/or a width of up to about 0.6m.

As shown in Figure 1, one embodiment of the invention comprises a frame (1) having a body (40). The body (40) comprises a side frame (2) located between a back frame (3) and a front frame (4), the back frame (3) defining an opening (5) having a recess (6) for receiving and surrounding generally planar artwork (7).

In use, a first surface (8) of the back frame (3) is substantially parallel with the surface of the artwork (7). The first surface (8) of the back frame (3) is coplanar with the plane of the front surface of the artwork (7). In use, a second surface (9) projects away from the artwork (7) and is inclined at an angle of about 35° to the first surface (8). A third surface (10) adjoins the side frame (2). A fourth surface (23) between the first surface (8) and the second surface (9) is substantially perpendicular to the first surface (8). The fourth surface (23) has a thickness of about 1mm.

The side frame (2) has a first surface (11) which adjoins the back frame (3). The side frame also has a second surface (12) which adjoins the front frame (4) and a recess (41) having a rectangular cross section and a recessed surface (42) for receiving a light source (13). The recessed surface (42) is located between the back frame (3) and the front frame (4). The recessed surface (42) is inclined towards the artwork (7) at an angle of about 80° to the plane of the artwork (7).

A tape or ribbon of a high CRI LED light source (13) is provided in the recess (41).

A heat sink is provided in the recess between the light source (13) and the recessed first surface (42). The heatsink is of an aluminium block having a rectangular profile and it abuts the recessed first surface (42) and the light source (13).

In an embodiment, the light source includes three rows of addressable LEDs in a multi row LED array. Each row of LEDs has a different beam angle relative to the artwork.

The front frame (4) and the side frame (2) have surfaces (14) (15) distant from the artwork (7) which have a decorative profile. In this regard, these surfaces (14) (15) have a plurality of projections (16) and a plurality of indents (17).

A diffuser (18) is located between the light source (13) and the artwork (7) adjacent to the light source (13).

As shown in Figure 2, the diffuser (18) has a first surface (21) and a second surface (22)(34), wherein the distance between the first surface (21) and the second surface (22)(34) is not constant.

A light path is provided between the first surface (21) and the second surface (22)(34) and the light is diffused more where the distance between the first surface (21) and the second surface (22)(34) is greater. Therefore, in use, the distance between the first surface (21) and the second surface (22)(34) of the diffuser (18) is greater nearer to the plane of the artwork (7).

In use, light from the light source (13) is directed onto the first surface (21) of the diffuser (18) and travels along the light path from the first surface (21) to the second surface (22)(34) of the diffuser (18). The light from the light source (13) is thereby diffused by the diffuser (18).

The diffuser (18) has a first part (19) and a second part (20), the first part (19) of clear acrylic or opal acrylic having a quadrilateral profile and a second part (20) of opal acrylic having a quadrilateral profile.

The first part (19) of the diffuser (18) is located between the light source (13) and the second part (20) of the diffuser (18).

The first part (19) of the diffuser (18) has a trapezoid profile wherein the profile has a first planar surface (21) for being located proximate to the light source (13), a parallel second planar surface (22) longer than the first planar surface (21) for being located distant to the light source (13), a third planar surface (23) inclined at about 60° to about 70°, more preferably about 65° to the second planar surface (22) and proximate to the plane of the artwork (7), and a fourth planar surface (24) inclined at about 80 to about 90°, more preferably about 84° to the second planar surface (22) and distant to the plane of the artwork (7).

The second part (20) of the diffuser (18) has a trapezoid profile wherein the profile has a first planar surface (31) for being located proximate to the light source (13), a parallel second planar surface (32) shorter than the first planar surface (31) for being located distant to the light source (13), a third planar surface (33) inclined at about 60° to about 70°, more preferably about 65° to the second planar surface (32) and proximate to the plane of the artwork (7), and a fourth planar surface (34) inclined at about 120° to about 130°, more preferably about 127° to the second planar surface (32) and distant to the plane of the artwork (7).

A portion of the second planar surface (22) of the first part (19) of the diffuser (18) is located to abut the first planar surface (31) of the second part (20) of the diffuser (18).

The width of the second planar surface (22) of the first part (19) of the diffuser (18) is less than the width of the first planar surface (31) of the second part (20) of the diffuser (18).

The third planar surface (23) of the first part (19) of the diffuser (18) and the third planar surface (33) of the second part (20) of the diffuser (18) are aligned and coplanar.

The portion of the second planar surface (22) of the first part (19) of the diffuser (18) which does not abut the first planar surface (31) of the second part (20) of the diffuser (18) and the fourth planar surface (34) of the second part (20) of the diffuser (18) together make up the second surface (22)(34) of the diffuser (18).

A longitudinal axis (36) through the centre of the light source (7) passes through the first part (19) of the diffuser (18) between the third planar surface (23) and the fourth planar surface (24) of the first part (19) of the diffuser (18).

An edge (35) between the first planar surface (31) and the fourth planar surface (34) of the second part (20) of the diffuser (18) is located on a longitudinal axis (36) through the centre of the light source (13).

In use, light is emitted from the light source (13) and some light from the light source (13) passes through only the first part (19) of the diffuser (18), whereas other light from the light source (13) passes through both the first part (19) and the second part (20) of the diffuser (18).

The diffuser (18) is rectangular and has a first pair of parallel sides and a second pair of parallel sides longer than the first pair. The first part (19) of the diffuser (18) is of clear acrylic along the full length of the first pair of parallel sides. In contrast, the first part (19) of the diffuser (18) is of clear acrylic for about the middle 60% of the second pair of parallel sides. The first part (19) of the diffuser (18) is of opal acrylic at each end of the second pair of parallel sides, and the first part (19) of the diffuser (18) is of opal acrylic for at least about 15% of the length of the second pair of parallel sides at each end thereof.

Advantageously, the diffuser (18) assists in lighting the artwork (7) substantially uniformly.

The frame (1) is rectangular for displaying a rectangular artwork (7).

The front frame (4) is removably attached to the side frame (2) by a plurality of magnets and corresponding magnetic material. This enables the front frame to be easily removed for access for example for installation or changing the light source (13).

The back frame (3) defines a double recess to allow LED drivers / controllers to be hidden within the frame (1) but still be easily accessible for wiring.

A surface (44) of the front frame (4) facing the artwork is finished in mat black.

Advantageously, the frame of the invention can be used for displaying an artwork and the artwork can be uniformly lit.

Examples

Various examples of the invention have been produced. These are described below.

The examples have followed development and testing of the invention and multiple unusual shaped opal acrylic diffusers have been prototyped starting with diffusers having a simple triangle profile to more complex shapes that have been required to reduce incidences of a bright spot close to the light source and to substantially evenly diffuse light across to the centre of the artwork.

The frame profile has a double recess in the rear of the back frame to allow LED drivers / controllers to be hidden within the frame but still be easily accessible for wiring.

The front frame is removable and securely fixed with magnetic pins. This allows the installation or replacement of the LED even when on the wall and ease of decoration.

The lighting of the frame can be controlled in the following multiple ways: * Smart home controller which has an app on your phone * Wall plate dimmer control * Wireless control * Scene control systems For example, a Leona smart home controller is being used for controlling a prototype with a Smart Life smartphone app.

A Wall Fixing system of split batons has been designed to be able to comfortably support all sizes of frames. This also allows the frame to be removed and replaced easily once the batons are in place.

Each wall screw fixing with plugs even into plasterboard with the right plugs can take a min of 10kg. In one example, 10 screws have been used creating a support load of 100kg for a prototype and the frame weighs approximately 25kg. A full width split baton at the top has been used having 6 screws with a lower split baton on both sides each with two screws into the wall and two into the frame.

Substantial research was done on the different LED tape types available. They vary considerably in quality, Lumen (brightness) output, CRI (Colour rendering index which is a measure of how well it defines colour), colour temperature degrees Kelvin (coolnatural-warm white), efficiency, sustainability, beam angle, dimming ability! dynamic tuneable white and colour changing dimmable RBG with white.

A range of solutions can be provided depending on the size / type of art and effect wanted.

For large canvasses high power LEDs are required to provide the light diffusion required for substantially even light distribution.

In one embodiment, LED tape is used as the light source. The tape is approximately lOmm wide, and it has been positioned in line with the outside edge of the recess, which is preferably 13mm wide. The reason for this is that it has been found that the further out the light beam is away for the angled frame the more light will travel to the centre and it has been found that it is easy to keep the tape straight against an edge.

It has been found that the use of powerful high colour rendering index (CRI) LEDs create an all over light effect with enhanced colour rendering. The effect has been found to be stunning.

Different sized frames have been developed and produced for different sized canvasses. The beam angle, depth/position of LED and the diffuser designs has been adjusted accordingly. Various sizes of frames have been produced including at least a small, medium and large frames.

Figure 3 shows the results of tests on working embodiments of the invention. The results show that excellent and uniform lighting of the artwork can be achieved. In this regard, Figure 3a shows the results achieved with the light source off, Figure 3b shows the results achieved with the light source having 50% brightness, Figure 3c shows the results achieved with the light source having 70% brightness, and Figure 3d shows the results achieved with the light source having 85% brightness The benefits of a frame according to the invention include but are not limited to: * Visually stunning art surprisingly lit from the frame * The LED light source is invisible * Substantially even quality light diffusion * The artwork is lit perfectly and becomes a light source itself * No need for protruding arms with an obstructing light source * No need for recessed ceiling, accent or any directed spot lighting * Much less building / electrical / decorative work to install * No light overspill on walls The above described embodiments have been given by way of example only, and the skilled reader will naturally appreciate that many variations could be made thereto without departing from the scope of the invention.

Claims

CLAIMS1. A frame for displaying artwork, wherein the frame comprises a body including a recess having a recessed first surface for receiving a light source, the recessed first surface being inclined towards the plane of the artwork in use at an angle of about 65° to about 85° to the plane of the artwork.
2. The frame according to claim 1, wherein the body defines an opening having a further recess for receiving and surrounding generally planar artwork.
3. The frame according to claim 1 or claim 2, wherein the recessed first surface is inclined towards the artwork at an angle of about 75° to about 80°.
4. The frame according to any one of the preceding claims, wherein at least one light source is provided which abuts the recessed first surface.
5. The frame according to any one of the preceding claims, wherein the light source includes at least one LED.
6. The frame according to any one of the preceding claims, wherein the light source includes an addressable multi row LED array.
7. The frame according to claim 6, wherein there are three rows of LEDs in the LED array.
8. The frame according to any one of the preceding claims, wherein the body has a second surface which in use is substantially parallel with the surface of the artwork, and a third surface projecting away from the artwork and inclined at an angle of about 25° to about 60° to the second surface.
9. The frame according to claim 8, wherein the third surface projecting away from the artwork is inclined at an angle of about 30° to about 50° to the second surface.
10. The frame according to any one of the preceding claims, wherein the body comprises a side frame located between a back frame and a front frame, the back frame defining an opening and having a recess for receiving and surrounding generally planar artwork, the side frame having the recessed first surface for receiving a light source.
11. The frame according to claim 10, wherein the back frame comprises a second surface which is substantially parallel with the surface of the artwork, and a third surface projecting away from the artwork, wherein the third surface is inclined at an angle of about 25° to about 60° to the second surface.
12. The frame according to any one of claims 10 to 11, wherein the front frame is removably attached to the side frame.
13. The frame according to claim 12, wherein the front frame is removably attached to the side frame by a plurality of magnets and corresponding magnetic material.
14. The frame according to any one of the preceding claims, wherein a surface of the frame facing the artwork is finished in mat black.
15. The frame according to any one of the preceding claims, wherein the body defines a double recess to allow LED drivers / controllers to be hidden within the body but still be easily accessible for wiring.
16. The frame according to any one of the preceding claims, wherein the frame includes a diffuser located between the light source and the artwork.
17. A diffuser for use in displaying an artwork, wherein the diffuser has a first surface and a second surface having a distance there between, and the distance between the first surface and the second surface is not constant.
18. The diffuser according to claim 17, wherein a light path is provided between the first surface and the second surface and light from a light source is diffused more by the diffuser where the distance between the first surface and the second surface is greater.
19. The diffuser according to any one of claims 17 to 18, wherein the first surface and / or the second surface is curved.
20. The diffuser according to any one of claims 17 to 18, wherein the diffuser comprises a first part and a second part, the first part of clear acrylic or opal acrylic having a quadrilateral profile and a second part of opal acrylic having a quadrilateral profile.
21. The diffuser according to claim 20, wherein in use the first part of the diffuser is located between a light source and the second part of the diffuser.
22. The diffuser according to claim 20 or claim 21, wherein the first part of the diffuser has a trapezoid profile wherein the profile has a first surface for being located proximate to a light source, a parallel second surface longer than the first surface for being located distant to the light source, a third surface inclined at about 60° to about 70° to the second surface and proximate to the plane of the artwork, and a fourth surface inclined at about 80 to about 900 to the second surface and distant to the plane of the artwork.
23. The diffuser according to anyone of claims 20 to 22, wherein the second part of the diffuser has a trapezoid profile wherein the profile has a first surface for being located proximate to a light source, a parallel second surface shorter than the first surface for being located distant to the light source, a third surface inclined at about 600 to about 700 to the second surface and proximate to the plane of the artwork, and a fourth surface inclined at about 120° to about 130° to the second surface and distant to the plane of the artwork.
24. The diffuser according to any one of claims 20 to 23, wherein the surfaces of the first and second parts of the diffuser are planar.
25. The diffuser according to any one of claims 20 to 24, wherein the first part of the diffuser abuts the second part of the diffuser.
26. The diffuser according to any one of claims 20 to 25, wherein the first part of the diffuser and the second part of the diffuser have surfaces which are aligned and coplanar.
27. The diffuser according to any one of claims 20 to 26, wherein the diffuser is rectangular and has a first pair of parallel sides and a second pair of parallel sides longer than the first pair, the first part of the diffuser being of clear acrylic along the full length of the first pair of parallel sides, the first part of the diffuser being of clear acrylic for about the middle 60% of the second pair of parallel sides, and the first part of the diffuser being of opal acrylic at each end of the second pair of parallel sides.
28. A frame according to any one of claims 1 to 16 comprising a diffuser according to any one of claims 20 to 27, wherein a longitudinal axis through the centre of the light source and perpendicular to the first surface of the body of the frame, passes through the first part of the diffuser between the third surface and the fourth surface of the first part of the diffuser.
29. The frame according to claim 28, wherein an edge between the first surface and the fourth surface of the second part of the diffuser is located on the longitudinal axis through the centre of the light source and perpendicular to the first surface of the body of the frame.