CA2473284C - Holographic display device with a transmission-type hologram - Google Patents
Holographic display device with a transmission-type hologram Download PDFInfo
- Publication number
- CA2473284C CA2473284C CA002473284A CA2473284A CA2473284C CA 2473284 C CA2473284 C CA 2473284C CA 002473284 A CA002473284 A CA 002473284A CA 2473284 A CA2473284 A CA 2473284A CA 2473284 C CA2473284 C CA 2473284C
- Authority
- CA
- Canada
- Prior art keywords
- transmission
- type hologram
- coherent light
- dimensional image
- hologram
- 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.)
- Expired - Fee Related
Links
- 230000001427 coherent effect Effects 0.000 claims abstract description 32
- 239000004065 semiconductor Substances 0.000 claims abstract description 4
- 238000005034 decoration Methods 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2249—Holobject properties
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
- G03H2001/0055—Adaptation of holography to specific applications in advertising or decorative art
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
- G03H2001/043—Non planar recording surface, e.g. curved surface
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2210/00—Object characteristics
- G03H2210/30—3D object
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Holo Graphy (AREA)
Abstract
.cndot. A holographic display device for displaying a 3-dimensional image has a cylindrical casing and a horizontally-placed concave or convex paraboloidal hologram in order to project an upright orthoscopic image having both horizontal and vertical parallaxes, and having a wide field of view. The hologram may be illuminated by a point source of coherent light, preferably a high-efficiency semiconductor laser diode, securely attached at the bottom of the cylindrical casing below the hologram. The hologram and the beam expander lens to illuminate the hologram may be removed, and the mirror to change the direction of the coherent light may be vibrated so that the coherent light projects dynamic line figures on a ceiling above the holographic display device.
This invention relates to holographic display devices for displaying a 3-dimensional image, and the principal use of the invention is for optical decoration.
This invention relates to holographic display devices for displaying a 3-dimensional image, and the principal use of the invention is for optical decoration.
Description
Description Title ~ Holographic Display Device witkv a Transmission-Type Hologram ~ This application is a division of Canadian Application 2 278 110, filed on 1999-07-20.
Technical Field ~ This invention relates to holographic display devices for displaying a 3-dimensional image, more particularly to a holographic display device having a paraboloidal hologram.
Background Art ~ There are many instances where it would be desirable to be able to have a compact holographic display devices for displaying a 3-dimensional image such as a statue.
~ A number of patents disclose holographic display devices with different configurations for d~_splaying holographic images.
~ These prior art arrangements have a hologram placed vertically to view an upright :_mage, either virtual or real.
When placed horizontally, a conventional hologram projects a 3-dimensional image parallel to the hologram. Horizontally-placed holograms with an upright image have not been produced mainly because of the difficuli:y of providing a good point source of light. So-called "edge-illuminated holograms" tend to be dim. So-called "multiple:c holograms" do not have a vertical parallax. Moreover, conventional planer holograms have a narrow field of view.
Description of the Invention ~ It is a primary object of the _~nvention to provide a holographic display device with a paraboloidal hologram to display an upright image.
~ It is another object of the invention to provide a point source of coherent light to illuminate the hologram.
~ It is another object of the invention to provide a method for displaying line figures on a ceiling with the coherent light.
~ A holographic display device fc~r displaying a 3-dimensional image has a cylindrical casing and a horizontally-placed concave or convex paraboloidal hologram in order to project an upright orthoscopic image h<~ving both horizontal and I I I I ~ ~~ I
vertical parallaxes, and having a wide field of view. The hologram may be illuminated by a point source of coherent light, preferably a high-efficiency semiconductor laser diode, securely attached at the bottom of the cylindrical casing below the hologram. The hologram and the beam expander lens to illuminate the hologram may be removed, and the mirror to change the direction of the coherent light may be vibrated so that the coherent light projects dynamic line figures on a ceiling above the holographic display device.
Brief Description of the Figures in the Drawings ~ In drawings which illustrate embodiments of the invention:
Figure 1 marked "Prior Art" is a perspective view of a conventional holographic display device with a 360-degree transmission-type hologram;
Figure 2 is a perspective ~riew of one embodiment of a holographic display device with a circular hologram according to the invention;
Figure 3 is a sectional view of the invention along line I-I of Figure 2;
Figure 4 is a perspective view of another embodiment of a holographic display device with a paraboloidal hologram according to the invention;
Figure 5 is a sectional view of the invention along line I-I of Figure 4;
Figure 6 is a perspective ~~iew of another embodiment of a holographic display device with a paraboloidal hologram according to the invention;
Figure 7 is a sectional view of the invention along line I-I of Figure 6; and Figure 8 is a sectional view of another embodiment of a holographic display device used as a laser beam pattern display device according to the invention.
Modes for Carrying Out the Invention ~ In one conventional holographic display configuration shown in Figure 1 marked "Prior Art", a point source of either coherent or white light 1-4 illuminates a transmission-type hologram 1-I from below to project an orthoscopic virtual image 1-3.
~ In this conventional holographic display configuration, also known as the "multiplex hologram" or "integral hologram", an orthoscopic virtual image is oriented parallel to the 360-degree hologram. The orthoscopic virtual image must be seen through the hologram because it is located behind the holographic film. Moreover, the orthoscopic virtual image has only horizontal parallax and no vertical parallax. According to the present invention, a circular or paraboloidal hologram projects an orthoscopic real or virtual image having both horizontal and vertical parallaxes, and the orthoscopic real or virtual image is oriented perpendicular to the hologram.
~ In one embodiment of the invention shown in Figure 2, a circular reflection-type or transmission-type hologram 2-1 is removably attached to a cylindrical casing 2-2 to project an orthoscopic real image 2-3. The circular hologram provides a relatively narrow field of view, as indicated in the figure.
~ Figure 3 shows a sectional view of the holographic display device with a circular transmission-type hologram along line I-I of Figure 2. A circular mount for supporting the hologram 3-1 is attached to the top end of the cylindrical casing 2-2.
A power supply and a control circuit 3-3 are securely attached to the cylindrical casing 2-2, and are operably connected to the point source of coherent light 3-4. The coherent light passes through a mirror to change the direction of the coherent light 3-5, followed by a beam expander lens 3-6 to illuminate the circular transmission-type hologram.
~ Preferably, the point source of coherent light 3-4 is a high-efficiency semiconductor laser diode.
~ In another embodiment of the invention shown in Figure 4, a concave paraboloidal reflection-type or transmission-type hologram 4-1 is removably attached to a cylindrical casing 4-2 to project an orthoscopic real image 4-3. The concave paraboloidal hologram provides a wider field of view than a circular hologram does, as indicated in the figure.
~ Figure 5 shows a sectional view of the holographic display device with a concave transmission-type hologram along line I-I of Figure 4. A circular mount for supporting the hologram 5-1 is attached to the top end ~~f the cylindrical casing 4-2.
A power supply and a control circuit 5-3 are securely attached to the cylindrical casing 4-2, and are operably connected to the point source of coherent light 5-4. The coherent light passes through a mirror to change the direction of the coherent light 5-5, followed by a beam expander lens 5-6 to illuminate the concave paraboloidal transmission-type hologram.
~ In another embodiment of the invention shown in Figure 6, a convex paraboloidal transmission-type hologram 6-1 is removably attached to a cylindrical casing 6-2 to project an orthoscopic virtual image 6-3. The convex paraboloidal hologram provides a wider field of view than a circular hologram does, as indicated in the figure.
Figure 7 shows a sectional view of the holographic display device with a convex transmission-type hologram along line I-I of Figure 6. A circular mount for supporting the hologram 7-1 is attached to the top end of the cylindrical casing 6-2.
A power supply and a control circuit 7-3 are securely attached to the cylindrical casing 6-2, and are operably connected to the point source of coherent light 7-4. The coherent light passes through a mirror to change the direction of the coherent light 7-5, followed by a beam expander lens 7-6 to illuminate the convex paraboloidal transmission-type hologram.
Preferably, the paraboloidal transmission-type hologram is computer-generated and has full colour. The holographic image may be superimposed with a real object having the same shape and size as the holographic image. A hologram having an image of a flame may simulate a tabletop candle if a pulsing coherent light is provided.
. Figure 8 shows a sectional view of the holographic display device along line I-I of Figure 2, Figure 4 or Figure 6 in which the beam expander lens 3-6 or 5-6 or 7-6 is removed. A
power supply and a control circuit 8-3 are securely attached to the cylindrical casing 8-2, and are operably connected to the point source of coherent light 8-4. The coherent light passes through a vibrating mirror to change the direction of the coherent light 8-5 in order to project dynamic line figures on a ceiling above the holographic display device.
Technical Field ~ This invention relates to holographic display devices for displaying a 3-dimensional image, more particularly to a holographic display device having a paraboloidal hologram.
Background Art ~ There are many instances where it would be desirable to be able to have a compact holographic display devices for displaying a 3-dimensional image such as a statue.
~ A number of patents disclose holographic display devices with different configurations for d~_splaying holographic images.
~ These prior art arrangements have a hologram placed vertically to view an upright :_mage, either virtual or real.
When placed horizontally, a conventional hologram projects a 3-dimensional image parallel to the hologram. Horizontally-placed holograms with an upright image have not been produced mainly because of the difficuli:y of providing a good point source of light. So-called "edge-illuminated holograms" tend to be dim. So-called "multiple:c holograms" do not have a vertical parallax. Moreover, conventional planer holograms have a narrow field of view.
Description of the Invention ~ It is a primary object of the _~nvention to provide a holographic display device with a paraboloidal hologram to display an upright image.
~ It is another object of the invention to provide a point source of coherent light to illuminate the hologram.
~ It is another object of the invention to provide a method for displaying line figures on a ceiling with the coherent light.
~ A holographic display device fc~r displaying a 3-dimensional image has a cylindrical casing and a horizontally-placed concave or convex paraboloidal hologram in order to project an upright orthoscopic image h<~ving both horizontal and I I I I ~ ~~ I
vertical parallaxes, and having a wide field of view. The hologram may be illuminated by a point source of coherent light, preferably a high-efficiency semiconductor laser diode, securely attached at the bottom of the cylindrical casing below the hologram. The hologram and the beam expander lens to illuminate the hologram may be removed, and the mirror to change the direction of the coherent light may be vibrated so that the coherent light projects dynamic line figures on a ceiling above the holographic display device.
Brief Description of the Figures in the Drawings ~ In drawings which illustrate embodiments of the invention:
Figure 1 marked "Prior Art" is a perspective view of a conventional holographic display device with a 360-degree transmission-type hologram;
Figure 2 is a perspective ~riew of one embodiment of a holographic display device with a circular hologram according to the invention;
Figure 3 is a sectional view of the invention along line I-I of Figure 2;
Figure 4 is a perspective view of another embodiment of a holographic display device with a paraboloidal hologram according to the invention;
Figure 5 is a sectional view of the invention along line I-I of Figure 4;
Figure 6 is a perspective ~~iew of another embodiment of a holographic display device with a paraboloidal hologram according to the invention;
Figure 7 is a sectional view of the invention along line I-I of Figure 6; and Figure 8 is a sectional view of another embodiment of a holographic display device used as a laser beam pattern display device according to the invention.
Modes for Carrying Out the Invention ~ In one conventional holographic display configuration shown in Figure 1 marked "Prior Art", a point source of either coherent or white light 1-4 illuminates a transmission-type hologram 1-I from below to project an orthoscopic virtual image 1-3.
~ In this conventional holographic display configuration, also known as the "multiplex hologram" or "integral hologram", an orthoscopic virtual image is oriented parallel to the 360-degree hologram. The orthoscopic virtual image must be seen through the hologram because it is located behind the holographic film. Moreover, the orthoscopic virtual image has only horizontal parallax and no vertical parallax. According to the present invention, a circular or paraboloidal hologram projects an orthoscopic real or virtual image having both horizontal and vertical parallaxes, and the orthoscopic real or virtual image is oriented perpendicular to the hologram.
~ In one embodiment of the invention shown in Figure 2, a circular reflection-type or transmission-type hologram 2-1 is removably attached to a cylindrical casing 2-2 to project an orthoscopic real image 2-3. The circular hologram provides a relatively narrow field of view, as indicated in the figure.
~ Figure 3 shows a sectional view of the holographic display device with a circular transmission-type hologram along line I-I of Figure 2. A circular mount for supporting the hologram 3-1 is attached to the top end of the cylindrical casing 2-2.
A power supply and a control circuit 3-3 are securely attached to the cylindrical casing 2-2, and are operably connected to the point source of coherent light 3-4. The coherent light passes through a mirror to change the direction of the coherent light 3-5, followed by a beam expander lens 3-6 to illuminate the circular transmission-type hologram.
~ Preferably, the point source of coherent light 3-4 is a high-efficiency semiconductor laser diode.
~ In another embodiment of the invention shown in Figure 4, a concave paraboloidal reflection-type or transmission-type hologram 4-1 is removably attached to a cylindrical casing 4-2 to project an orthoscopic real image 4-3. The concave paraboloidal hologram provides a wider field of view than a circular hologram does, as indicated in the figure.
~ Figure 5 shows a sectional view of the holographic display device with a concave transmission-type hologram along line I-I of Figure 4. A circular mount for supporting the hologram 5-1 is attached to the top end ~~f the cylindrical casing 4-2.
A power supply and a control circuit 5-3 are securely attached to the cylindrical casing 4-2, and are operably connected to the point source of coherent light 5-4. The coherent light passes through a mirror to change the direction of the coherent light 5-5, followed by a beam expander lens 5-6 to illuminate the concave paraboloidal transmission-type hologram.
~ In another embodiment of the invention shown in Figure 6, a convex paraboloidal transmission-type hologram 6-1 is removably attached to a cylindrical casing 6-2 to project an orthoscopic virtual image 6-3. The convex paraboloidal hologram provides a wider field of view than a circular hologram does, as indicated in the figure.
Figure 7 shows a sectional view of the holographic display device with a convex transmission-type hologram along line I-I of Figure 6. A circular mount for supporting the hologram 7-1 is attached to the top end of the cylindrical casing 6-2.
A power supply and a control circuit 7-3 are securely attached to the cylindrical casing 6-2, and are operably connected to the point source of coherent light 7-4. The coherent light passes through a mirror to change the direction of the coherent light 7-5, followed by a beam expander lens 7-6 to illuminate the convex paraboloidal transmission-type hologram.
Preferably, the paraboloidal transmission-type hologram is computer-generated and has full colour. The holographic image may be superimposed with a real object having the same shape and size as the holographic image. A hologram having an image of a flame may simulate a tabletop candle if a pulsing coherent light is provided.
. Figure 8 shows a sectional view of the holographic display device along line I-I of Figure 2, Figure 4 or Figure 6 in which the beam expander lens 3-6 or 5-6 or 7-6 is removed. A
power supply and a control circuit 8-3 are securely attached to the cylindrical casing 8-2, and are operably connected to the point source of coherent light 8-4. The coherent light passes through a vibrating mirror to change the direction of the coherent light 8-5 in order to project dynamic line figures on a ceiling above the holographic display device.
Claims (6)
1. A holographic display device for displaying a 3-dimensional image, comprising:
a transmission-type hologram having a bottom surface and a rotational axis;
a circular mount for supporting the transmission-type hologram, the circular mount having a rotational axis;
a cylindrical casing for supporting the circular mount, the cylindrical casing having a bottom end;
a point source of coherent light, the point source of coherent light securely attached to the bottom end of the cylindrical casing;
a mirror for changing the direction of the coherent light from the point source of coherent light by reflection, the mirror securely attached to the bottom end of the cylindrical casing;
a beam expander lens for illuminating the bottom surface of the transmission-type hologram, the beam expander lens expanding the coherent light from the point source of coherent light reflected from the mirror, the beam expander lens securely attached to the bottom end of the cylindrical casing; and a power supply and a control circuit securely attached to the cylindrical casing, the power supply and the control circuit operably connected to the point source of coherent light in order to supply power to the point source of coherent light;
the rotational axis of the transmission-type hologram aligning with the rotational axis of the circular mount, the transmission-type hologram having both horizontal and vertical parallaxes, the transmission-type hologram projecting an upright orthoscopic real 3-dimensional image along the rotational axis of the transmission-type hologram.
a transmission-type hologram having a bottom surface and a rotational axis;
a circular mount for supporting the transmission-type hologram, the circular mount having a rotational axis;
a cylindrical casing for supporting the circular mount, the cylindrical casing having a bottom end;
a point source of coherent light, the point source of coherent light securely attached to the bottom end of the cylindrical casing;
a mirror for changing the direction of the coherent light from the point source of coherent light by reflection, the mirror securely attached to the bottom end of the cylindrical casing;
a beam expander lens for illuminating the bottom surface of the transmission-type hologram, the beam expander lens expanding the coherent light from the point source of coherent light reflected from the mirror, the beam expander lens securely attached to the bottom end of the cylindrical casing; and a power supply and a control circuit securely attached to the cylindrical casing, the power supply and the control circuit operably connected to the point source of coherent light in order to supply power to the point source of coherent light;
the rotational axis of the transmission-type hologram aligning with the rotational axis of the circular mount, the transmission-type hologram having both horizontal and vertical parallaxes, the transmission-type hologram projecting an upright orthoscopic real 3-dimensional image along the rotational axis of the transmission-type hologram.
2. The holographic display device for displaying a 3-dimensional image as defined in claim 1, in which the transmission-type hologram is concave paraboloidal, the transmission-type hologram projecting an upright orthoscopic real 3-dimensional image along the rotational axis of the transmission-type hologram.
3. The holographic display device for displaying a 3-dimensional image as defined in claim 1, in which the transmission-type hologram is convex paraboloidal, the transmission-type hologram projecting an upright orthoscopic virtual 3-dimensional image along the rotational axis of the transmission-type hologram.
4. The holographic display device for displaying a 3-dimensional image as defined in claim 1 or claim 2 or claim 3, in which the point source of coherent light is a high-efficiency semiconductor laser diode.
5. The holographic display device for displaying a 3-dimensional image as defined in claim 1 or claim 2 or claim 3, in which the transmission-type hologram is computer-generated, and has full colour.
6. The holographic display device for displaying a 3-dimensional image as defined in claim 1 or claim 2 or claim 3, in which the holographic 3-dimensional image is superimposed with a real object having the same shape and the same size as the holographic 3-dimensional image.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2278110 CA2278110C (en) | 1999-07-20 | 1999-07-20 | Holographic display device with a paraboloidal hologram |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2278110 Division CA2278110C (en) | 1999-07-20 | 1999-07-20 | Holographic display device with a paraboloidal hologram |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2473284A1 CA2473284A1 (en) | 2001-01-20 |
| CA2473284C true CA2473284C (en) | 2005-09-20 |
Family
ID=4163807
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2278110 Expired - Fee Related CA2278110C (en) | 1999-07-20 | 1999-07-20 | Holographic display device with a paraboloidal hologram |
| CA002473284A Expired - Fee Related CA2473284C (en) | 1999-07-20 | 1999-07-20 | Holographic display device with a transmission-type hologram |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2278110 Expired - Fee Related CA2278110C (en) | 1999-07-20 | 1999-07-20 | Holographic display device with a paraboloidal hologram |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA2278110C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2541344A1 (en) * | 2011-06-27 | 2013-01-02 | Hakem Al Fayez Hind | Method using holography for the displaying of information or image, for example advertisement |
| US20180058650A1 (en) * | 2016-08-30 | 2018-03-01 | Jian Fang | Holographic electronic candle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8500284B2 (en) | 2008-07-10 | 2013-08-06 | Real View Imaging Ltd. | Broad viewing angle displays and user interfaces |
-
1999
- 1999-07-20 CA CA 2278110 patent/CA2278110C/en not_active Expired - Fee Related
- 1999-07-20 CA CA002473284A patent/CA2473284C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2541344A1 (en) * | 2011-06-27 | 2013-01-02 | Hakem Al Fayez Hind | Method using holography for the displaying of information or image, for example advertisement |
| US20180058650A1 (en) * | 2016-08-30 | 2018-03-01 | Jian Fang | Holographic electronic candle |
| US10378710B2 (en) * | 2016-08-30 | 2019-08-13 | Jian Fang | Holographic electronic candle |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2278110C (en) | 2004-11-23 |
| CA2278110A1 (en) | 2001-01-20 |
| CA2473284A1 (en) | 2001-01-20 |
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|---|---|---|---|
| EEER | Examination request | ||
| FZDC | Correction of dead application (reinstatement) | ||
| MKLA | Lapsed |