CA1062519A - Two-dimensional light deflector apparatus - Google Patents
Two-dimensional light deflector apparatusInfo
- Publication number
- CA1062519A CA1062519A CA268,487A CA268487A CA1062519A CA 1062519 A CA1062519 A CA 1062519A CA 268487 A CA268487 A CA 268487A CA 1062519 A CA1062519 A CA 1062519A
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- Canada
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- light
- cylindrical
- image
- holograms
- scanner
- Prior art date
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- Mechanical Optical Scanning Systems (AREA)
Abstract
TWO-DIMENSIONAL LIGHT DEFLECTOR APPARATUS
Abstract of the Disclosure A two-dimensional light deflector is shown which comprises a cylindrical member having a plurality of holograms recorded thereon. A collimated light beam is directed to illuminate the hologram cylinder and rotation of the hologram cylinder provides a line scan which is at an angle of about 45 degrees with respect to the plane of rotation of the cylinder.
The azimuthal position of the line scan can be varied by the ro-tation of a small mirror which directs the illumination beam.
As a consequence, a two-dimensional raster scan on a cylindrical image surface is produced.
Abstract of the Disclosure A two-dimensional light deflector is shown which comprises a cylindrical member having a plurality of holograms recorded thereon. A collimated light beam is directed to illuminate the hologram cylinder and rotation of the hologram cylinder provides a line scan which is at an angle of about 45 degrees with respect to the plane of rotation of the cylinder.
The azimuthal position of the line scan can be varied by the ro-tation of a small mirror which directs the illumination beam.
As a consequence, a two-dimensional raster scan on a cylindrical image surface is produced.
Description
13 Background of the Invention 14 This invention relates to liqht beam scannin~ apparatus and more particularly to liqht beam scanninq aPparatus utiliz-16 ing rotating holograms.
17 There exists a need for a scanner apparatus oPerable 18 so that a light beam can be scanned in a line-by-line fashion 19 over a given area. Generally, the prior art scanners have been capahle of scanning in one dimension at a relatively fast 21 scanning rate. However, the scan for the second dimension is 22 at a relatively slow scanninq rate. For example, one Drior 23 art scanner utilizes a rotatinq mirror to provide a relatively 24 fast scan in one dimension. An oscillating mirror is positioned 25 to locate the scan lines in a direction perpendicular to the 26 fast scan direction and this scan is at a relatively slow rate.
27 Attempts to improve these scanners have resulted in more complex 28 arrangements and, in some cases, there is a requirement for 29 synchronization between two or more COmDOnentS of the scanning system.
SA'75017 l It is therefore the Princ;pal object of this invention
17 There exists a need for a scanner apparatus oPerable 18 so that a light beam can be scanned in a line-by-line fashion 19 over a given area. Generally, the prior art scanners have been capahle of scanning in one dimension at a relatively fast 21 scanning rate. However, the scan for the second dimension is 22 at a relatively slow scanninq rate. For example, one Drior 23 art scanner utilizes a rotatinq mirror to provide a relatively 24 fast scan in one dimension. An oscillating mirror is positioned 25 to locate the scan lines in a direction perpendicular to the 26 fast scan direction and this scan is at a relatively slow rate.
27 Attempts to improve these scanners have resulted in more complex 28 arrangements and, in some cases, there is a requirement for 29 synchronization between two or more COmDOnentS of the scanning system.
SA'75017 l It is therefore the Princ;pal object of this invention
2 to provide improved apparatus for scanning a light beam over
3 a given two-dimensional area.
4 Summary_of the Invention Briefly, according to the invention, the scanning 6 apparatus comprises a cylindrical member having a plurality 7 of holograms recorded on its surface, optical means for producing 8 a collimated.light beam and for directing the beam to illuminate g a small area of the hologram to produce a point on an image sur-face. ~rive means are provided to rotate the cylindrical member ll about its axis to form a line scan on the image surface and drive 12 means are provided to rotate the beam directing means about the 13 axis of the cylindr;cal memher so that the reconstructed ~eam 14 can produce a two-dimensional raster scan of the image surface.
15 Brief Descr;ption of the nrawings 16 FIG~IRE 1 is a diagrammatic schematic view of the 17 scanning apparatus embodying the invention;
18 FIGURE 2 is a diagrammatic section view along lines l9 2-2 of the scanning apparatus shown in Figure l;
FIGURE 3 is a schematic v1ew of a recording system 21 ut~lizing the l~ght beam scanner shown in Figures 1 and 2;
22 FIGllRE 4 is a diaqram showing the geometry illustrating 23 ~ plane hologram formation;
24 FIGURE 5 is a diagram showing the geometry relating 25 to the reconstruction of the focal line of the hologram 26 formed in Figure 4;
27 FIGURE 6 is a diagram showing reconstruction of a 28 poi`nt and deflection of the reconstructed Point for a hologram 29 formed in Figure 4.
SA~ 75nl7 -2-1 Detailed Description of the Preferred Fmbodiment 2 Referring to Figure 1, the light beam scanner com-3 prises a holograDhic cylindrical member 10 having a plurality 4 of holograms 12a, 12h, ...12n recorded on its surface. nptica means 18 is provided to produce a beam of light and direct the 6 beam to impinge on holographic member 10 to produce a reconstructed 7 beam. nptical means 18 comprises a laser 16 which emits a colli-8 mated light beam 14. Beam 14 impinges on beam conf;guring and g deflecting means 19 which directs the divergent light beam 20 to impinge on holographic member ln to produce a reconstructed con-11 vergent beam 22. nrive means such as motor 24 is connected by a 12 suitable mechanical coupling 23 (shown dotted in the drawing) to 13 holographic member 10 to rotate it about the axis of the cylinder 14 10, thereby causing the beam 2n to illuminate successive holograms 12. This action causes the reconstructed beam 22 to provide a 16 line scan at an angle to the plane of rotation of the hologram 17 cylinder 10. Drive means such as motor 24 is also connected by a 18 sul't~ble mechanical coupling 25 (shown dotted in the drawing) to 19 optical means 18 to rotate it about the axis of hologram cylinder 10. A separate motor such as a stepping motor drive, may be pro-21 vided to drive optical means 18, if desired. This action causes 22 the reconstructed beam 22 to be generated at a different azimuthal 23 positi~on and, due to the rotation of optical means 18, each point 24 on an image cylinder is reached in a short time.
The holographic cylindrical member ln comprises suitable 26 radial support members 2fi mounted to support transparent cylin-27 drical member 28. Member 28 preferably comprises a glass cylinder 28 hav~ng a suitable photopolymer deposited on its inner surface.
29 Howe~er, the photopolymer could as well he deposited on the outer -.
surface of the glass cylinder, if desired. The cylinder has a SA9;5nl7 -3-10625~9 1 number of holograms recorded thereon by techniques known in 2 the art. These holograms are volume phase holograms so that 3 a high holographic efficiency is obtained and the number n of 4 holograms recorded ;s chosen hased on the speed of rotat;on of member ln and the required number of scanning lines. In tyPical 6 applications, member ln is rotated at a high speed such as 7 l2 ,ono RPM.
8 The principle of operation of the scanner can be better g understood by referring to the diagrams shown in Figures 4. 5 and 6. A rectangular photosensitive plate is subjected to the 11 interference pattern of a cyl;ndrical wave as an object wave 12 and an essentially plane wave as a reference wave to form a 13 hologram 30 as shown in Figure 4. The focal line of the cylin-14 drical wave lies ;n a parallel plane at a distance do from the hologram plane 31 and makes an angle a' with the longitudinal 16 direction of the hologram 3n as shown in F;gure 5. Illuminat-17 ing the entire holoqram 3n with the conjugate reference wave re- --18 constructs the whole focal line 29. However, ;lluminating only 19 a part of the hologram 3n (such as area ABCn in Fi~ure 5) re-20 constructs the corresponding part (A'D') of the focal line.
21 ll 1 iminating a part of hologram 3n (such as area ABC~
22 of Figure 5) with a cylindrically convergent reference wave 23 having a focal line perpendicular to the focal l;ne of hologram 24 3n compresses the portion A'D' of the focal line to a recon-structed point P. The correcting term applied to the plane 26 reference wave at the hologram formation compensates the in-27 creasing distance d (see Fig. 6a) of the focal l;ne from the 28 center of subsequent areas ~BCD, mak;ng ;t poss;ble to apply in 29 the reconstruction of a point the same convergent reference wave for all Port;ons of the hologram.
106Z5~9 1 Having the cylindrically convergent reference heam 2 fixed and moving the hologram 3n along its longitudinal axis, 3 as shown in two views in Figures ~a, h, deflects the recon-4 structed point perpendicular to the focal l;ne of the hologram.
A repeated deflection of the beam is achieved if a series of 6 holograms is recorded.
7 The same principle described above for a plane hologram 8 can be applied to a hologram of cylindrical shape. The reference g wave in this case has to be essentially rotationally invariant with respect to the center of curvature of the hologram cylinder.
11 If the hologram is illuminated by such a reference wave (e.g., 12 a spherical or cylindrical divergent wave emerging from the 13 axis of the hologram cylinder) then a convergent cylindrical 14 wave is reconstructed, ~ts focal line making an angle ~ between 0 and 90 degrees, preferably about 45 degrees, with respect to 16 the plane contain;ng the base of the cylindrical member. The 17 angle of 45 degrees is preferred since this angle produces the 18 longest scan line and therefore the greatest resolution. Illumi-19 nating only a portion of the hologram with a similar (but in the directi~on of the focal line) convergent wave reconstructs a point.
21 Rotati~ng the hologram cylinder with its axis of curvature as its 22 axi-s of rotation deflects the reconstructed point perpendicular 2~ to the f~cal line.
24 A beam deflector in two dlmensions consists of several c~ ndr~cal holograms as descrihed above recorded all around a 26 tranSparent ring. The reference wave from laser lfi, incident 27 along the axis of rotation as a plane wave, is formed by means of 28 beam configurinq and deflecting means l9 which functions to form 29 the beam into a cylindrically divergent beam 20 directed toward the hologram ring lO. Cylindrically divergent beam 20 is shaped SA97~l7 ~5~
1 0 62 5~ 9 1 to 111uminate a small portion of the hologram and this 2 illumination reconstructs a small segment of the original line 3 image. This reconstructed beam has more convergence in the 4 direction of the line image so as to converge the reconstructed line segment to a point. Thus, it can be seen that the recon-6 struction of a point is actually a two-step process in which 7 the two steps occur simultaneously. In the embodiment shown, 8 beam configuring and deflecting means 19 comprises a cylindrical g lens 32 and a small mirror 34. Beam configuring and deflecting means 1~ is rotated about the same axis as hologram cylinder ln.
11 By rotating the hologram ring at constant high speed, the recon-12 structed point is deflected continuously along a line on an outer 13 image cylinder. Due to the fact that optical means 18 is small, 14 it can be accelerated fast, making it possible to reach each point of the image cylinder in a short time.
16 A storage device embodying our holographic light deflector 17 is shown in Figure 2. The storage device comprises a light beam 18 deflector positioned to scan storage member 4n. Storage member 19 4n is arranged in cylindrical fashion and positioned to he coincident with the image cylinder sur~ace scanned by the light 21 deflector apparatus. The data to be accessed by the scanner is 22 recorded on storage member 40 as coded representations of data 23 by any sultable means. Storage member 40 is made from any suitable 24 optl'cal data storage material and the choice of material depends on t~e type of recording chosen. For example, if the recording 26 i`~s read-only recording, the material may be a photographic film.
27 To produce a read-write storage device a magneto-optical material 28 may be used, for example. A plurality of sensing devices 42-1, 29 42-2, ... 42-n are radially disposed adjacent to storage member 40. Sensing devices 42 may comprlse any suitable devices such as SA97~nl7 -fi-1 a photosensitive device for a read-only storage and a device 2 incorporating suitable analyzers and polarizers for the example 3 in which magneto-optic techniques are used, for example. autputs 4 from the various sensing devices are interconnected to individual readout buffers 44. To avoid confusion in the drawing, only a 6 single buffer 44 and interconnections 46 are shown. Electr;cal 7 patterns of the stored information are read out through these lines 8 46 and stored in the readout buffer 44 from which the information 9 is read to some form of utilization device under control of a gate control means 48 lnterconnected by way of line 50 to the buffer 44.
11 The gate control means 48 is interconnected by way of line 52 to 12 a photodiode 54 which receives light pulses of reflected liqht 13 along a path 56 from timinq track S~ which has an alternate ar-14 rangement of reflecting and nonreflecting surfaces. Liqht from 15 source fin is projected by way of a light path 62 to the t;ming 16 track 58 from which pulses of light are reflected to the photo-17 diode 54. The latter changes the light pulses to electrical 18 pulses. nn a readout operation the holographic cylinder member 19 10' is rotated by drive motor 24' by a drive connection such as 20 belts or gears, shown dotted in the drawing. Beam configuring 21 and deflecting means 1~' are driven by a suitable motor 27 such 22 as a stepping motor, through a suitable mechanical coupling shown 23 dotted in the drawing. The steppinq motor can be controlled to 24 prov~de either continuous or stepping drive as is known in the art.
25 A suitable modulator 15 is provided to selectively modulate beam 26 14' from laser 16'. By the use of the drive prov;ded by motor 27 27 and the control provided by modulator 15, random access to all 28 data from storage member 4n is provided. During a cycle of rota-29 tion, of beam configuring and deflecting means 19' and many rota-tions of the cylindrical member 10', light from laser source 16 SA9/5nl7 -7-1 is directed to every point on the storage member 4n and infor-2 mation is detected by the appropriate devices 42. Selective 3 readout control is further achieved hy way of lines 64-1, 64-2, 4 64-3, ... 64-n to a sequence control unit 36 which is in turn connected by way of a line 66 to an address control means 38.
6 Under control of the latter, different sequences and combinations 7 of sensing devices 42 can be selected to read out any desiired 8 combination of stored words of information. The address control 9 means 28 can address a certain line or word of storage and the sequence control unit 36 is utilized to control modulator 15 to 11 achieve readout of the desired bits within that line or word.
12 While the invention has been particularly shown and 13 described with reference to a preferred embodiment thereof, it 14 will be understood by those skilled in the art that various changes in the form and details may be made therein without de-16 parting from the spirit and scope of the invention.
17 What is claimed is:
SA97~01 7 -8-
15 Brief Descr;ption of the nrawings 16 FIG~IRE 1 is a diagrammatic schematic view of the 17 scanning apparatus embodying the invention;
18 FIGURE 2 is a diagrammatic section view along lines l9 2-2 of the scanning apparatus shown in Figure l;
FIGURE 3 is a schematic v1ew of a recording system 21 ut~lizing the l~ght beam scanner shown in Figures 1 and 2;
22 FIGllRE 4 is a diaqram showing the geometry illustrating 23 ~ plane hologram formation;
24 FIGURE 5 is a diagram showing the geometry relating 25 to the reconstruction of the focal line of the hologram 26 formed in Figure 4;
27 FIGURE 6 is a diagram showing reconstruction of a 28 poi`nt and deflection of the reconstructed Point for a hologram 29 formed in Figure 4.
SA~ 75nl7 -2-1 Detailed Description of the Preferred Fmbodiment 2 Referring to Figure 1, the light beam scanner com-3 prises a holograDhic cylindrical member 10 having a plurality 4 of holograms 12a, 12h, ...12n recorded on its surface. nptica means 18 is provided to produce a beam of light and direct the 6 beam to impinge on holographic member 10 to produce a reconstructed 7 beam. nptical means 18 comprises a laser 16 which emits a colli-8 mated light beam 14. Beam 14 impinges on beam conf;guring and g deflecting means 19 which directs the divergent light beam 20 to impinge on holographic member ln to produce a reconstructed con-11 vergent beam 22. nrive means such as motor 24 is connected by a 12 suitable mechanical coupling 23 (shown dotted in the drawing) to 13 holographic member 10 to rotate it about the axis of the cylinder 14 10, thereby causing the beam 2n to illuminate successive holograms 12. This action causes the reconstructed beam 22 to provide a 16 line scan at an angle to the plane of rotation of the hologram 17 cylinder 10. Drive means such as motor 24 is also connected by a 18 sul't~ble mechanical coupling 25 (shown dotted in the drawing) to 19 optical means 18 to rotate it about the axis of hologram cylinder 10. A separate motor such as a stepping motor drive, may be pro-21 vided to drive optical means 18, if desired. This action causes 22 the reconstructed beam 22 to be generated at a different azimuthal 23 positi~on and, due to the rotation of optical means 18, each point 24 on an image cylinder is reached in a short time.
The holographic cylindrical member ln comprises suitable 26 radial support members 2fi mounted to support transparent cylin-27 drical member 28. Member 28 preferably comprises a glass cylinder 28 hav~ng a suitable photopolymer deposited on its inner surface.
29 Howe~er, the photopolymer could as well he deposited on the outer -.
surface of the glass cylinder, if desired. The cylinder has a SA9;5nl7 -3-10625~9 1 number of holograms recorded thereon by techniques known in 2 the art. These holograms are volume phase holograms so that 3 a high holographic efficiency is obtained and the number n of 4 holograms recorded ;s chosen hased on the speed of rotat;on of member ln and the required number of scanning lines. In tyPical 6 applications, member ln is rotated at a high speed such as 7 l2 ,ono RPM.
8 The principle of operation of the scanner can be better g understood by referring to the diagrams shown in Figures 4. 5 and 6. A rectangular photosensitive plate is subjected to the 11 interference pattern of a cyl;ndrical wave as an object wave 12 and an essentially plane wave as a reference wave to form a 13 hologram 30 as shown in Figure 4. The focal line of the cylin-14 drical wave lies ;n a parallel plane at a distance do from the hologram plane 31 and makes an angle a' with the longitudinal 16 direction of the hologram 3n as shown in F;gure 5. Illuminat-17 ing the entire holoqram 3n with the conjugate reference wave re- --18 constructs the whole focal line 29. However, ;lluminating only 19 a part of the hologram 3n (such as area ABCn in Fi~ure 5) re-20 constructs the corresponding part (A'D') of the focal line.
21 ll 1 iminating a part of hologram 3n (such as area ABC~
22 of Figure 5) with a cylindrically convergent reference wave 23 having a focal line perpendicular to the focal l;ne of hologram 24 3n compresses the portion A'D' of the focal line to a recon-structed point P. The correcting term applied to the plane 26 reference wave at the hologram formation compensates the in-27 creasing distance d (see Fig. 6a) of the focal l;ne from the 28 center of subsequent areas ~BCD, mak;ng ;t poss;ble to apply in 29 the reconstruction of a point the same convergent reference wave for all Port;ons of the hologram.
106Z5~9 1 Having the cylindrically convergent reference heam 2 fixed and moving the hologram 3n along its longitudinal axis, 3 as shown in two views in Figures ~a, h, deflects the recon-4 structed point perpendicular to the focal l;ne of the hologram.
A repeated deflection of the beam is achieved if a series of 6 holograms is recorded.
7 The same principle described above for a plane hologram 8 can be applied to a hologram of cylindrical shape. The reference g wave in this case has to be essentially rotationally invariant with respect to the center of curvature of the hologram cylinder.
11 If the hologram is illuminated by such a reference wave (e.g., 12 a spherical or cylindrical divergent wave emerging from the 13 axis of the hologram cylinder) then a convergent cylindrical 14 wave is reconstructed, ~ts focal line making an angle ~ between 0 and 90 degrees, preferably about 45 degrees, with respect to 16 the plane contain;ng the base of the cylindrical member. The 17 angle of 45 degrees is preferred since this angle produces the 18 longest scan line and therefore the greatest resolution. Illumi-19 nating only a portion of the hologram with a similar (but in the directi~on of the focal line) convergent wave reconstructs a point.
21 Rotati~ng the hologram cylinder with its axis of curvature as its 22 axi-s of rotation deflects the reconstructed point perpendicular 2~ to the f~cal line.
24 A beam deflector in two dlmensions consists of several c~ ndr~cal holograms as descrihed above recorded all around a 26 tranSparent ring. The reference wave from laser lfi, incident 27 along the axis of rotation as a plane wave, is formed by means of 28 beam configurinq and deflecting means l9 which functions to form 29 the beam into a cylindrically divergent beam 20 directed toward the hologram ring lO. Cylindrically divergent beam 20 is shaped SA97~l7 ~5~
1 0 62 5~ 9 1 to 111uminate a small portion of the hologram and this 2 illumination reconstructs a small segment of the original line 3 image. This reconstructed beam has more convergence in the 4 direction of the line image so as to converge the reconstructed line segment to a point. Thus, it can be seen that the recon-6 struction of a point is actually a two-step process in which 7 the two steps occur simultaneously. In the embodiment shown, 8 beam configuring and deflecting means 19 comprises a cylindrical g lens 32 and a small mirror 34. Beam configuring and deflecting means 1~ is rotated about the same axis as hologram cylinder ln.
11 By rotating the hologram ring at constant high speed, the recon-12 structed point is deflected continuously along a line on an outer 13 image cylinder. Due to the fact that optical means 18 is small, 14 it can be accelerated fast, making it possible to reach each point of the image cylinder in a short time.
16 A storage device embodying our holographic light deflector 17 is shown in Figure 2. The storage device comprises a light beam 18 deflector positioned to scan storage member 4n. Storage member 19 4n is arranged in cylindrical fashion and positioned to he coincident with the image cylinder sur~ace scanned by the light 21 deflector apparatus. The data to be accessed by the scanner is 22 recorded on storage member 40 as coded representations of data 23 by any sultable means. Storage member 40 is made from any suitable 24 optl'cal data storage material and the choice of material depends on t~e type of recording chosen. For example, if the recording 26 i`~s read-only recording, the material may be a photographic film.
27 To produce a read-write storage device a magneto-optical material 28 may be used, for example. A plurality of sensing devices 42-1, 29 42-2, ... 42-n are radially disposed adjacent to storage member 40. Sensing devices 42 may comprlse any suitable devices such as SA97~nl7 -fi-1 a photosensitive device for a read-only storage and a device 2 incorporating suitable analyzers and polarizers for the example 3 in which magneto-optic techniques are used, for example. autputs 4 from the various sensing devices are interconnected to individual readout buffers 44. To avoid confusion in the drawing, only a 6 single buffer 44 and interconnections 46 are shown. Electr;cal 7 patterns of the stored information are read out through these lines 8 46 and stored in the readout buffer 44 from which the information 9 is read to some form of utilization device under control of a gate control means 48 lnterconnected by way of line 50 to the buffer 44.
11 The gate control means 48 is interconnected by way of line 52 to 12 a photodiode 54 which receives light pulses of reflected liqht 13 along a path 56 from timinq track S~ which has an alternate ar-14 rangement of reflecting and nonreflecting surfaces. Liqht from 15 source fin is projected by way of a light path 62 to the t;ming 16 track 58 from which pulses of light are reflected to the photo-17 diode 54. The latter changes the light pulses to electrical 18 pulses. nn a readout operation the holographic cylinder member 19 10' is rotated by drive motor 24' by a drive connection such as 20 belts or gears, shown dotted in the drawing. Beam configuring 21 and deflecting means 1~' are driven by a suitable motor 27 such 22 as a stepping motor, through a suitable mechanical coupling shown 23 dotted in the drawing. The steppinq motor can be controlled to 24 prov~de either continuous or stepping drive as is known in the art.
25 A suitable modulator 15 is provided to selectively modulate beam 26 14' from laser 16'. By the use of the drive prov;ded by motor 27 27 and the control provided by modulator 15, random access to all 28 data from storage member 4n is provided. During a cycle of rota-29 tion, of beam configuring and deflecting means 19' and many rota-tions of the cylindrical member 10', light from laser source 16 SA9/5nl7 -7-1 is directed to every point on the storage member 4n and infor-2 mation is detected by the appropriate devices 42. Selective 3 readout control is further achieved hy way of lines 64-1, 64-2, 4 64-3, ... 64-n to a sequence control unit 36 which is in turn connected by way of a line 66 to an address control means 38.
6 Under control of the latter, different sequences and combinations 7 of sensing devices 42 can be selected to read out any desiired 8 combination of stored words of information. The address control 9 means 28 can address a certain line or word of storage and the sequence control unit 36 is utilized to control modulator 15 to 11 achieve readout of the desired bits within that line or word.
12 While the invention has been particularly shown and 13 described with reference to a preferred embodiment thereof, it 14 will be understood by those skilled in the art that various changes in the form and details may be made therein without de-16 parting from the spirit and scope of the invention.
17 What is claimed is:
SA97~01 7 -8-
Claims (12)
1. A holographic light deflector apparatus comprising:
a cylindrical member having a plurality of holograms recorded on a surface thereof, each of said holograms when reconstructed producing a line image on a cylindrical image surface, with each line being at an angle with respect to the plane containing the base of said cylindrical member;
optical means for producing and directing a beam of light toward said cylindrical member, said beam of light being shaped to illuminate a small area of said holograms and being shaped to produce more convergence in the direction of the original line scan so as to reconstruct a point image;
means for rotating said cylindrical member about its axis at a constant high speed so that the resulting reconstructed point image is deflected in a direction perpendicular to the original line image; and means for rotating said optical means about the axis of said cylindrical member so that said reconstructed image point is capable of scanning the entire cylindrical image surface.
a cylindrical member having a plurality of holograms recorded on a surface thereof, each of said holograms when reconstructed producing a line image on a cylindrical image surface, with each line being at an angle with respect to the plane containing the base of said cylindrical member;
optical means for producing and directing a beam of light toward said cylindrical member, said beam of light being shaped to illuminate a small area of said holograms and being shaped to produce more convergence in the direction of the original line scan so as to reconstruct a point image;
means for rotating said cylindrical member about its axis at a constant high speed so that the resulting reconstructed point image is deflected in a direction perpendicular to the original line image; and means for rotating said optical means about the axis of said cylindrical member so that said reconstructed image point is capable of scanning the entire cylindrical image surface.
2. The light deflector apparatus of Claim 1 wherein said optical means comprises a light source for providing a beam of light, a beam configuring means and a reflecting means.
3. The light deflector apparatus of Claim 2 wherein said light source for providing a beam of light comprises a coherent laser source.
4. The light deflector apparatus of Claim 2 wherein said beam configuring means comprises a cylindrical lens.
5. The light deflector apparatus of Claim 2 wherein said reflecting means comprises a mirror mounted for rotation about the axis of the cylindrical member.
6. A storage apparatus comprising:
a cylindrical scanner member having a plurality of holograms recorded on a surface thereof, each of said holograms when reconstructed producing a line image on a cylindrical image surface, with each line being at an angle with respect to the plane containing the base of said cylindrical member;
a cylindrical record member having data recorded thereon mounted concentric with said cylindrical scanner member;
optical means for producing and directing a beam of light toward said cylindrical scanner member, said beam of light being shaped to illuminate a small area of said holograms and being shaped to produce more convergence in the direction of the original line scan so as to reconstruct a point image;
means for rotating said cylindrical scanner member about its axis at a constant high speed so that the resulting recon-structed point image is deflected in a direction perpendicular to the original line image;
means for rotating said optical means about the axis of said cylindrical scanner member so that said reconstructed image point is capable of scanning the entire cylindrical record member;
and means for sensing the data from a predetermined area of said record member.
a cylindrical scanner member having a plurality of holograms recorded on a surface thereof, each of said holograms when reconstructed producing a line image on a cylindrical image surface, with each line being at an angle with respect to the plane containing the base of said cylindrical member;
a cylindrical record member having data recorded thereon mounted concentric with said cylindrical scanner member;
optical means for producing and directing a beam of light toward said cylindrical scanner member, said beam of light being shaped to illuminate a small area of said holograms and being shaped to produce more convergence in the direction of the original line scan so as to reconstruct a point image;
means for rotating said cylindrical scanner member about its axis at a constant high speed so that the resulting recon-structed point image is deflected in a direction perpendicular to the original line image;
means for rotating said optical means about the axis of said cylindrical scanner member so that said reconstructed image point is capable of scanning the entire cylindrical record member;
and means for sensing the data from a predetermined area of said record member.
7. The storage apparatus of Claim 6 wherein said optical means comprises a light source for providing a beam of light, a beam configuring means and a reflecting means.
8. The storage apparatus of Claim 7 wherein said light source for providing a beam of light comprises a coherent laser source.
9. The scanner apparatus of Claim 7 wherein said beam configuring means comprises a cylindrical lens.
10. The scanner apparatus of Claim 7 wherein said reflecting means comprises a mirror mounted for rotation about the axis of the cylindrical member.
11. The storage apparatus of Claim 8 wherein said light source for providing a beam of light includes light modulator means for modulating the light beam incident to said optical means.
12. The storage apparatus of Claim 11 wherein said modulator means modulates the light beam intensity.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/643,819 US3983565A (en) | 1974-12-27 | 1975-12-23 | Device for recording speed operating conditions of a wheeled vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062519A true CA1062519A (en) | 1979-09-18 |
Family
ID=24582350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA268,487A Expired CA1062519A (en) | 1975-12-23 | 1976-12-22 | Two-dimensional light deflector apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1062519A (en) |
-
1976
- 1976-12-22 CA CA268,487A patent/CA1062519A/en not_active Expired
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