GB2260199A - Lenticular sheet - Google Patents
Lenticular sheet Download PDFInfo
- Publication number
- GB2260199A GB2260199A GB9120926A GB9120926A GB2260199A GB 2260199 A GB2260199 A GB 2260199A GB 9120926 A GB9120926 A GB 9120926A GB 9120926 A GB9120926 A GB 9120926A GB 2260199 A GB2260199 A GB 2260199A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lenticular sheet
- aperturing
- lenslets
- preform
- grooves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B35/00—Stereoscopic photography
- G03B35/18—Stereoscopic photography by simultaneous viewing
- G03B35/24—Stereoscopic photography by simultaneous viewing using apertured or refractive resolving means on screens or between screen and eye
Abstract
A lenticular sheet comprises an array of parallel cylindrical lenslets 4 which define a series of parallel grooves 10. The lenslets are apertured by means of an opaque aperturing material 12 partially filling the grooves 10. Such a lenticular sheet may be made by forming a preform having a structure of the desired cylindrical lenslets, aperturing the lenslets by partially filling the grooves 10 with an opaque aperturing material 12, and heating and pulling the preform to until the desired dimensions of lenticular shoot are obtained. <IMAGE>
Description
LENTICULAR SHEET
This invention relates to lenticular sheets primarily for use in 3-D imaging systems. A lenticular sheet is an array of parallel cylindrical lenslets which is used in a well known manner to provide stereoscopic images to a human viewer when placed in front of suitable image data. One such stereoscopic image display is illustrated in European
Patent application 354,851 published 14th February 1990.
It is an object of the present invention to provide a lenticular sheet having improved imaging properties. It is a further objective of the present invention to provide a method of forming such an improved lenticular sheet.
According to the present invention a lenticular sheet comprising an array of parallel, cylindrical lenslets which define a series of parallel grooves is characterised in that the lenslets are apertured by aperturing material partially filling the grooves.
According to a second aspect of the present invention a method of forming a lenticular sheet according to the first aspect of the present invention is characterised in that it includes the steps of:
a) forming a preform having the structure of the desired cylindrical lenslets;
b) partially filling the grooves of the preform with an aperturing material; and
c) heating and pulling the preform until the desired dimensions of lenticular sheet are obtained.
The preform and aperturing material are preferably of the same material so that on heating and pulling the preform they fuse into a common structure. The materials may be glass or plastics for example. The aperturing material is chosen to be opaque at the operating wavelength. So, if the lenticular sheet is to be used to present a stereoscopic view to a human viewer the material aperturing the lenslets will be chosen to be opaque in the visible region of the optical spectrum. If, on the other hand, the sheet is to be used in forming a 3-D stereoscopic image then the preform will be chosen to be transparent in the infrared region of the optical spectrum with the aperturing material opaque to the infrared region of the spectrum being employed for imaging.
The method of making the lenticular sheet according to the present invention, namely by pulling down a preform, is an extension of the technique used to fabricate optical fibres in which a preform similar to the desired optical fibre but of larger dimensions is heated and pulled until it is reduced to the desired size. The use of pulling preforms to form non-cylindrical optical fibres is known.
See for example an article titled "Fast Diffraction-limited
Cylindrical Microlenses" by James J Snyder, Patrick
Reichert and Thomas M Baer in Applied Optics volume 30 number 19 July 1991. The present invention extends this known preform pulling technique to the fabrication of a planar lenticular sheet which preform is sufficiently stable during pulling to maintain the relative dimensions of the sheet as the dimensions shrink during pulling.
An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings of which:
Figure 1 is a top view of a section of a lenticular sheet made according to the method of the present invention;
Figure 2 is a cross-section of the lenticular sheet of
Figure 1 along the line II-II.
Referring to Figures 1 and 2 a lenticular sheet 2 according to the present invention comprises an array a parallel, cylindrical lenslets or lenticels 4 having a curved upper surface 6 and a flat lower surface 8. The lenslets 4 define a series of parallel grooves 10. Each of the grooves 10 of the lenticular sheet is partially filled with an aperturing material 12. In the embodiment illustrated in Figure 1 the lenslets are formed from transparent plastic whilst the aperturing material 12 comprises an opaque plastic.
The method of making the lenticular sheet of Figures 1 and 2 is as follows. A plastic preform approximately ten times the size of the final lenticular sheet dimensions is formed by pressing the plastic material into a mould (not shown). The lenticular sheet is then removed from the mould and infill material of an opaque plastic inserted into the grooves 10. The preform is then heated and pulled until the lateral dimensions of the lenticular sheet have been reduced to the desired dimensions. In the particular embodiment shown in Figures 1 and 2 the initial preform sheet is 30mm long, its width being defined by 5000 lenslets each 10mm wide. The preform is then pulled along the direction of its length until each 10mm diameter lenslet has reduced to a lmm wide lenslet. For such a lenticular sheet with no aperturing the best spot size was 6 micrometres (RMS) with 80% aperturing the best spot size was 3 micrometres (RMS) and with 64% aperturing the best spot size was 2 micrometres (RMS).
Other forms of lenslet may be employed with the present invention for example the preform may be formed as a series of doublet lenses which will retain their structure during pulling the preform and so provide the known benefits of such lenses to the lenticular sheet of the present invention.
Claims (3)
1. A lenticular sheet comprising an array of parallel, cylindrical lenslets which define a series of parallel grooves characterised in that the lenslets are apertured by aperturing material partially filling the grooves.
2. A lenticular sheet as claimed in claim 1 which is made from plastics materials.
3. A method of forming a lenticular sheet according to claim 1 including the steps of:
a) forming a preform having the structure of the desired cylindrical lenslets;
b) aperturing the lenslets by partially filling the grooves with an aperturing material; and
c) heating and pulling the preform until the desired dimensions of lenticular sheet are obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9120926A GB2260199B (en) | 1991-10-01 | 1991-10-01 | Lenticular sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9120926A GB2260199B (en) | 1991-10-01 | 1991-10-01 | Lenticular sheet |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9120926D0 GB9120926D0 (en) | 1991-11-13 |
| GB2260199A true GB2260199A (en) | 1993-04-07 |
| GB2260199B GB2260199B (en) | 1995-11-22 |
Family
ID=10702310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9120926A Expired - Fee Related GB2260199B (en) | 1991-10-01 | 1991-10-01 | Lenticular sheet |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2260199B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4447448A1 (en) * | 1994-12-29 | 1996-07-04 | Seebeck Norbert Dipl Ing | Three-dimensional picture reproducing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB653927A (en) * | 1948-06-23 | 1951-05-30 | Leslie Peter Clarence Jack Dud | Improvements in or relating to means for displaying steroscopic pictures |
| GB1189468A (en) * | 1966-12-12 | 1970-04-29 | Rlm Res Corp | Integral Photography |
| GB1222008A (en) * | 1967-07-14 | 1971-02-10 | Rlm Res Corp | Photographic reproduction of pseudoscopic real image generator plates |
-
1991
- 1991-10-01 GB GB9120926A patent/GB2260199B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB653927A (en) * | 1948-06-23 | 1951-05-30 | Leslie Peter Clarence Jack Dud | Improvements in or relating to means for displaying steroscopic pictures |
| GB1189468A (en) * | 1966-12-12 | 1970-04-29 | Rlm Res Corp | Integral Photography |
| GB1222008A (en) * | 1967-07-14 | 1971-02-10 | Rlm Res Corp | Photographic reproduction of pseudoscopic real image generator plates |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4447448A1 (en) * | 1994-12-29 | 1996-07-04 | Seebeck Norbert Dipl Ing | Three-dimensional picture reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9120926D0 (en) | 1991-11-13 |
| GB2260199B (en) | 1995-11-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19961001 |