Source: https://patents.google.com/patent/DE19630736B4/en
Timestamp: 2020-01-25 12:07:03
Document Index: 470681748

Matched Legal Cases: ['art 201', 'art 201', 'art 203', 'art 203', 'art 205', 'art 205', 'art 42', 'art 201', 'art 201']

DE19630736B4 - Projection screen for rear projection TV - Google Patents
Projection screen for rear projection TV
DE19630736B4
DE19630736B4 DE19630736A DE19630736A DE19630736B4 DE 19630736 B4 DE19630736 B4 DE 19630736B4 DE 19630736 A DE19630736 A DE 19630736A DE 19630736 A DE19630736 A DE 19630736A DE 19630736 B4 DE19630736 B4 DE 19630736B4
DE19630736A
DE19630736A1 (en
Chang-wan Anyang Hong
Jong-bae Suwon Park
1995-07-31 Priority to KR1995-95-23463 priority Critical
1996-07-30 Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
1997-02-06 Publication of DE19630736A1 publication Critical patent/DE19630736A1/en
2006-09-21 Publication of DE19630736B4 publication Critical patent/DE19630736B4/en
Projection screen for a rear-projection TV, comprising:
a Fresnel lens (30) having circular divisions for focusing incident image light into the center of the optical axis of the projection screen, and
an optical diffuser part (201, 203, 205) having a lenticular portion (21, 23, 27) for diffusing the image light received by the Fresnel lens, the outer surface of the optical diffuser part being made of glass,
the glass is a reinforced glass material,
the circular partitions face the inside of the projection apparatus and the lenticular section is formed either by etching the glass or as a film, and faces the inside of the projection television.
The The present invention relates to a projection screen for a rear projection television according to the preambles the claims 1 and 2, and more particularly to a projection screen for a rear-projection television in which a screen for displaying image light from a projector projecting a cathode ray tube and a projector lens or a project lens is designed so that a wide Field of vision and the feeling a direct view, as in a Braun tube.
Such a projection screen is already out of the US Pat. No. 3,832,032 known. This projection screen has a Fresnel lens with optical diffuser, wherein the optical diffuser can be made of various materials, such as plastic or glass. In this projection screen, circular divisions of the Fresnel lens face the structured surface of the diffuser lens. The Fresnel lens is spaced from the diffuser part.
From the DE 33 15 475 A1 A projection screen is already known, in which a field lens, a focusing lens and a diffuser are stacked together to form a unitary structure.
Out JP 06-38151 A is a projection screen with a Fresnel lens and a lenticular section, the two lenses being arranged over one Flange area are interconnected.
From the DE 43 27 123 A1 For example, a Fresnel lens made of UV-curable resin is known. First and second lenses are joined together at a certain distance. Here is the minimum distance between the two lenses to avoid scratching.
A patentee's internal knowledge corresponding screen for a back projection television is formed by a Fresnel lens and a lenticular lens (lenticular lens). The reference number 10 in 3 denotes a screen. A Fresnel lens, denoted by the reference numeral 11 is located on the side of a Braun tube, and focuses a beam of light from
Peripheral sections come from the center of the screen 10 are removed, towards the center of the screen 10 , A lenticular lens indicated by the reference numeral 12 is designated, leads to a widening in the horizontal direction of the screen 10 so that the brightness of the screen 10 over the entire surface of the screen 10 becomes even.
The Fresnel lens and the lenticular lens in the known rear-projection TV exist made of acrylic. The screen therefore has large differences in dependence of the observation angle, so that in total the field of observation limited becomes. About that In addition, the material can be easily scratched and due to low Breaking strength, which affects image quality.
outgoing from this prior art, the present invention is the The object of the invention is to provide a projection screen which prevents that the surface the Fresnel lens and the diffuser part are damaged by external impact and at the same time compact and space-saving.
According to the invention this Problem solved by the features of claims 1 and 2.
3 a perspective view of the structure of a screen in a conventional rear-projection TV;
4 a view for explaining the function of a lenticular lens of 3 ;
1A a side view of a projection screen for a rear-projection TV according to an embodiment of the present invention;
1B a side view of a projection screen for a rear-projection TV according to another embodiment of the present invention;
1C a side view of a projection screen for a rear-projection TV according to another embodiment of the present invention; and
2A and 2 B Representations of a round and a flat type in the 1A to 1C shown projection screens.
1A to 1C show projection screens for a rear-projection TV According to the present invention, and are side views showing the embodiments of the projection screens, which are referred to as glass screens. At the in 1A The projection screen shown becomes a Fresnel lens 30 formed by an ultraviolet curing resin or a transparent thin plate having Fresnel properties, and has circular divisions 31 on which face the inside of the projection TV. An optical diffuser part 201 comprises an outer, reinforced glass layer 20 and an inner lenticular grid layer 21 , The lenticular layer 21 consists of a diffuser material or a diffuser film with lenticular features, so it has the function of diffusing the light and displaying the image. If the lenticular layer 21 the diffuser part forms, the diffuser part is on the layer 20 made of reinforced glass, whereas when the layer 21 consists of a diffuser film, the diffuser film on the reinforced glass layer 20 is attached. The optical diffuser part 201 with the structure described above is with the Fresnel lens 30 combined by printing plates.
In 1B , which shows a side view of another embodiment of the present invention, becomes an optical diffuser part 203 through a layer 20 made of reinforced glass and a lenticular surface 23 formed by etching the reinforced glass layer 20 will be produced. The lenticular surface 23 is formed by coating or fixing a special material or a part having holographic properties unlike the lenticular layer according to FIG 1A , The lenticular surface 23 therefore has the optical properties of a hologram. The optical diffuser part 203 is using the Fresnel lens 30 by a compression molding process, sandwiching a thermosetting resin 25 between the lenticular surface 23 and the Fresnel lens 30 is provided.
In 1C , which shows a side view of another embodiment of the present invention, becomes a lenticular grid layer 27 formed by a diffuser part or a diffuser film, the or with reference to 1A has lenticular function, or as a hologram according to 1B is trained. The lenticular layer 27 is on the reinforced glass layer 20 piled up or attached to this. The optical diffuser part 205 is from the Fresnel lens 30 through a spacer 41 kept at a distance. The Fresnel lens 30 is on the optical diffuser part 205 through a fastening part 42 attached.
The 2A and 2 B Fig. 3 are perspective views showing the projection screens described with reference to Figs 1A to 1C have been described. The optical diffuser part 201 . 203 or 206 has mounting hardware 22A to 22D at its four corners, to which the optical diffuser part is fixed in front of the television. 2 B shows that the optical diffuser part 201 . 203 or 205 is flat.
As described above, the projection screen for a rear-projection TV has an outer surface, the amplified Glass is made to see the same picture quality as a brown Tube to disposal to face, and a wide field of vision. The reinforced glass is stable against scratching or breakage, so that the resistance against external influences is improved. Furthermore, the device according to the present invention Invention formed flat, which is the production of a projection screen with huge Dimensions facilitates, and allows the Training a curved surface portion on the circumference, as in a Braun's Tube, which leads to the advantage of a wide field of vision.
Projection screen for a rear-projection television, comprising: a Fresnel lens ( 30 ) having circular partitions for focusing incident image light into the center of the optical axis of the screen, and an optical diffuser part (14). 201 . 203 . 205 ) with a lens grid section ( 21 . 23 . 27 ) to diffuse the image light received by the Fresnel lens, the outer surface of the optical diffuser part being made of glass, characterized in that the glass is a reinforced glass material facing circular partitions of the inside of the projection apparatus and the lenticular section is either through Etching of the glass or formed as a film, and facing the inside of the projection television.
Projection screen for a rear-projection television, comprising: a Fresnel lens ( 30 ) for focusing incident image light into the center of the optical axis of the projection screen, and an optical diffuser part (10). 201 . 203 . 205 ) with a lens grid section ( 21 . 23 . 27 ) to diffuse the image light received by the Fresnel lens, the outer surface of the optical diffuser part being made of glass, characterized in that the glass is a reinforced glass material and the Fresnel lens (10) 30 ) and the optical diffuser part ( 201 . 203 . 205 ) are connected by printing plates, wherein a thermosetting resin is provided between the lenticular portion and the Fresnel lens.
DE19630736A 1995-07-31 1996-07-30 Projection screen for rear projection TV Expired - Fee Related DE19630736B4 (en)
KR1995-95-23463 1995-07-31
DE19630736A1 DE19630736A1 (en) 1997-02-06
DE19630736B4 true DE19630736B4 (en) 2006-09-21
DE19630736A Expired - Fee Related DE19630736B4 (en) 1995-07-31 1996-07-30 Projection screen for rear projection TV
EP0117792B1 (en) * 1983-02-08 1987-01-07 Thomson-Csf Device for visualizing a cathode-ray tube coloured image equipped with a holographic element, and method of producing said element
DE4130930A1 (en) * 1991-09-13 1993-03-25 Flachglas Ag Attachment unit for screens or the like
DE4327123A1 (en) * 1992-08-14 1994-02-17 Rca Thomson Licensing Corp An optical element, such as a rear projection screen for an image display device and method of manufacturing the same
JP3004208B2 (en) 2000-01-31