Rear projection module

Claim 2

Large-area projection screen (2) for displaying an image from a rear projection module, wherein the projection screen (2) comprises a lenticular sheet (3) and a support sheet (5), each of which has a light-input-side face (3a, 5a ) facing the projection unit (30), a light-output-side face (3b, 5b) lying opposite the latter and a peripheral surface (3c, 5c) connecting the input face to the output face and a Fresnel structure (4d) disposed between its input face (2a) and its output face (2b), characterized in that the surface dimensions of the lenticular sheet (3) and of the support sheet (5) each are arranged to have a least one dimension smaller on the light-input-side face (3a,5a ) than on the light-output-side face (3b, 5b), wherein the surface dimensions of the light-input-side face (3a) of the lenticular sheet (3) and of the light-output-side face (5b) of the support sheet (5) correspond to those of the Fresnel structure (4d) disposed between them, the support sheet (5) is constructed such that it may be supported on its peripheral surface (5c) by a support element (7), wherein a partial section of the support element serves as a fixing part (8) and the partial section is situated in the propagation direction of the projected light at the end of the support element (7) and clasps the support sheet (5) at least in certain sections of its peripheral surface (5c), and an area of the peripheral surface (3c) of the lenticular sheet (3) is constructed such that it may be connected to at least one of an area of the peripheral surface (5c) of the support sheet (5) and an area of the outer surface of the fixing part (8) by means of a connection means (9) arranged peripherally distributed at least in certain sections, wherein the outer dimensions of the fixing part (8) and of the connection means (9) exceed the surface dimensions of the light-output-side face (3b) of the lenticular sheet (3) by not more than the spacing A of adjacent picture elements (16) on the projection screen (2).

Claim 3

Projection screen (2) according to claim 1, characterized in that the surface dimensions of the light-output-side face (3b) of the lenticular sheet (3) are less than 2 mm greater than those of the light-input-side surface (3a).

Claim 4

Projection screen (2) according to claim 1 or 2, characterized in that the peripheral surface (3c) of the lenticular sheet (3) is con-structed in such a way that the light of a picture element (16) closest to the edge of the image plane (10) of the projected image, which image plane (10) is situated in the lenticular sheet (3), can exit unimpeded through the edge of the light-output-side face (3b) of the lenticular sheet (3).

Claim 5

Projection screen (2) according to claim 1 or 2, characterized in that the peripheral surface (3c, 5c) of at least one of the lenticular sheet (3) and of the support sheet (5) is constructed one of step- and terrace-shaped.

Claim 6

Projection screen (2) according to claim 1 or 2, characterized in that the Fresnel structure (4d) is formed on a Fresnel sheet (4) which is disposed between the support sheet (5) and the lenticular sheet (3).

Claim 7

Projection screen (2) according to claim 5, characterized in that the Fresnel structure (4d) is formed on the light-output-side face (4b) of the Fresnel sheet (4).

Claim 8

Projection screen (2) according to claim 6, characterized in that the light-input-side face (4a) of the Fresnel sheet (4) is connected firmly to the light-output-side face (5b) of the support sheet (5).

Claim 9

Projection screen (2) according to claim 6, characterized in that the light-input-side face (4a) of the Fresnel sheet (4) rests against the light-output-side face (5b) of the support sheet (5).

Claim 10

Projection screen (2) according to claim 6, characterized in that the light-input-side face (4a) of the Fresnel sheet (4) is separated by a gap from the light-output-side face (5b) of the support sheet.

Claim 11

Projection screen (2) according to claim 9, characterized in that the width of the gap is less than 0.5 mm.

Claim 12

Projection screen (2) according to claim 6, 7, 8, 9, or 10, characterized in that at least one spacer element ensuring the maintenance of a small surface spacing is disposed between the light-output-side face (5b) of the support sheet (5) and the light-input-side face (4a) of the Fresnel sheet (4).

Claim 13

Projection screen (2) according to claims 11, characterized in that the spacer element comprises a multiplicity of pins.

Claim 14

Projection screen (2) according to claim 11, characterized in that the spacer element comprises a fabric- or gauze-type structure.

Claim 15

Projection screen (2) according to claims 5, characterized in that the Fresnel sheet (4) is a Fresnel film with a thickness of less than 1.0 mm.

Claim 16

Projection screen (2) according to claim 1, characterized in that the lenticular sheet (3) is surface laminated on the light-input- (3a) and the light-output-side (3b) face.

Claim 17

Projection screen (2) according to claim 1, characterized in that the support sheet (5) is surface laminated on the light-input- (5a) and the light-output-side (5b) face.

Claim 18

Projection screen (2) according to claim 1, wherein the outer dimensions of the fixing part (8) and of the connection means (9) are not greater than the surface dimensions of the light-output-side face (3b) of the lenticular sheet (3).

Claim 19

Projection screen (2) according to claim 17, characterized in that the fixing part (8) encloses the peripheral surface (5c) of the support sheet (5) and is constructed wedge-shaped.

Claim 20

Projection screen (2) according to claim 17, or 18, characterized in that an area of the peripheral surface (5c) of the support sheet (5) is connected to the fixing part (8) by a securing means (12) disposed peripherally at least in certain sections.

Claim 21

Projection screen (2) according to claim 19, characterized in that the connection means (9) is also the securing means (12).

Claim 22

Projection screen (2) according to claimed 19, characterized in that at least one of the connection means (9) and the securing means (12) is constructed as an adhesive strip.

Claim 23

Rear projection module for displaying an image on a large-area projection screen (2), comprising; a light transmissive picture generator (15) for depicting an image on a reduced scale, an illumination unit (20) for the transillumination of the light transmissive picture generator (15), a projection unit (30) for the enlarged imaging onto the projection screen (2) of the image depicted by the light transmissive picture generator (15), and a projection screen comprising a lenticular sheet (3) and a support sheet (5), each of which has a light-input-side face (3a, 5a) facing the projection unit (30), a light-output-side face (3b, 5b) lying opposite the latter and a peripheral surface (3c, 5c) connecting the input face to the output face and a Fresnel structure (4d) disposed between its input face (2a) and its output face (2b), characterized in that the surface dimensions of the lenticular sheet (3) and of the support sheet (5) each are arranged to have at least one dimension smaller on the light-input-side face (3a,5a) than on the light-output-side face (3b, 5b), wherein the surface dimensions of the light-input-side face (3a) of the lenticular sheet (3) and of the light-output-side face (5b) of the support sheet (5) correspond to those of the Fresnel structure (4d) disposed between them, the support sheet (5) is constructed such that it may be supported on its peripheral surface (5c) by a support element (7), wherein a partial section of the support element serves as a fixing part (8) and the partial section is situated in the propagation direction of the projected light at the end of the support element (7) and clasps the support sheet (5) at least in certain sections of its peripheral surface (5c), and an area of the peripheral surface (3c) of the lenticular sheet (3) is constructed such that it may be connected to at least one of an area of the peripheral surface (5c) of the support sheet (5) and an area of the outer surface of the fixing part (8) by means of a connection means (9) arranged peripherally distributed at least in certain sections, wherein the outer dimensions of the fixing part (8) and of the connection means (9) exceed the surface dimensions of the light-output-side face (3b) of the lenticular sheet (3) by not more than the spacing A of adjacent picture elements (16) on the projection screen (2).

Claim 24

Rear projection module for displaying an image on a large-area projection screen (2), comprising; a light transmissive picture generator (15) for depicting an image on a reduced scale, an illumination unit (20) for the transillumination of the light transmissive picture generator (15), a projection unit (30) for the enlarged imaging onto the projection screen (2) of the image depicted by the light transmissive picture generator (15), and a projection screen comprising a lenticular sheet (3) and a support sheet (5), each of which has a light-input-side face (3a, 5a) facing the projection unit (30), a light-output-side face (3b, 5b) lying opposite the latter and a peripheral surface (3c, 5c) connecting the input face to the output face and a Fresnel structure (4d) disposed between its input face (2a) and its output face (2b), characterized in that the surface dimensions of the lenticular sheet (3) and of the support sheet (5) each are arranged to have at least one dimension smaller on the light-input-side face (3a,5a) than on the light-output-side face (3b, 5b), wherein the surface dimensions of the light-input-side face (3a) of the lenticular sheet (3) and of the light-output-side face (5b) of the support sheet (5) correspond to those of the Fresnel structure (4d) disposed between them, the support sheet (5) is constructed such that it may be supported on its peripheral surface (5c) by a support element (7), wherein a partial section of the support element serves as a fixing part (8) and the partial section is situated in the propagation direction of the projected light at the end of the support element (7) and clasps the support sheet (5) at least in certain sections of its peripheral surface (5c), and an area of the peripheral surface (3c) of the lenticular sheet (3) is constructed such that it may be connected to at least one of an area of the peripheral surface (5c) of the support sheet (5) and an area of the outer surface of the fixing part (8) by means of a connection means (9) arranged peripherally distributed at least in certain sections, wherein the outer dimensions of the fixing part (8) and of the connection means (9) exceed the surface dimensions of the light-output-side face (3b) of the lenticular sheet (3) by not more than the spacing A of adjacent picture elements (16) on the projection screen (2).

Claim 25

Rear projection module for displaying an image on a large-area projection screen (2), comprising a light transmissive picture generator (15) for depicting the image on a reduced scale, an illumination unit (20) for the transillumination of the light transmissive picture generator (15) and a projection unit (30) for the enlarged imaging onto the projection screen (2) of the image depicted by the light transmissive picture generator (15), with a module housing (40) screening a light input face (2a) of the projection screen (2) from ambient light, on the front side (41) of which module housing (40) the projection screen (2) is disposed, characterized in that the projection unit (30) is disposed on the inside (42) of the module housing (40), the light transmissive picture generator (15) is disposed in a cutout (44) in a wall area (43) of the module housing (40), the illumination unit (20) is disposed outside the module housing (40) in a light source housing (51) which is removable at the cutout (44) of the module housing (40) and can be attached to the module housing (40) in such a way that it projects out of the wall area (43) of the module housing (40).

Claim 26

Rear projection module for displaying an image on a large-area projection screen (2), comprising a light transmissive picture generator (15) for depicting the image on a reduced scale, an illumination unit (20) for the transillumination of the light transmissive picture generator (15) and a projection unit (30) for the enlarged imaging onto the projection screen (2) of the image depicted by the light transmissive picture generator (15), with a module housing (40) screening a light input face (2a) of the projection screen (2) from ambient light, on the front side (41) of which module housing (40) the projection screen (2) is disposed, characterized in that the projection unit (30) is disposed on the inside (42) of the module housing (40), the light transmissive picture generator (15) is disposed in a cutout (44) in a wall area (43) of the module housing (40), the illumination unit (20) is disposed outside the module housing (40) in a light source housing (51) which is removable at the cutout (44) of the module housing (40) and can be attached to the module housing (40) in such a way that it projects out of the wall area (43) of the module housing (40).

Claim 27

Rear projection module according to claim 23, characterized in that the module housing (40) comprises in a corresponding area (45), which is provided for a light source housing (51) secured to an adjacent rear projection module (1), a chamfering (46), opening or cutout accessible from its outside, said chamfering (46), opening or cutout being so constructed that the light source housing (51) of the adjacent rear projection module (1) can be disposed in the corresponding area (45).

Claim 28

Rear projection module according to claim 24, characterized in that the module housing (40) comprises a rear wall (47) which is arranged opposite a front side (41), and at least two oppositely disposed side walls (48, 49) connecting the front side (41) to the rear wall (47), wherein the rear wall (47) comprises at the transition point (50) to the first side wall (48) the chamfering (46), opening or cutout, and in the second side wall (49) the cutout (44) for the light transmissive picture generator (15) is disposed.

Claim 29

Rear projection module according to claim 25, characterized in that the chamfering (46), opening or cutout extends in a vertical direction through the rear wall (47) and the first side wall (48).

Claim 30

Rear projection module according to claim 23, 24, 25 or 26, characterized in that there is disposed in the light source housing (51) a light deflecting mirror (24) and the light source (21) of the illumination unit (20) is accessible from the rear side of the rear projection module (1).