GB1466425A – Transmitting optical information
– Google Patents
GB1466425A – Transmitting optical information
– Google Patents
Transmitting optical information
Info
Publication number
GB1466425A
GB1466425A
GB1343074A
GB1343074A
GB1466425A
GB 1466425 A
GB1466425 A
GB 1466425A
GB 1343074 A
GB1343074 A
GB 1343074A
GB 1343074 A
GB1343074 A
GB 1343074A
GB 1466425 A
GB1466425 A
GB 1466425A
Authority
GB
United Kingdom
Prior art keywords
granulation
acoustic
plate
wave
prism
Prior art date
1973-03-29
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
Application number
GB1343074A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date 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 date listed.)
1973-03-29
Filing date
1974-03-26
Publication date
1977-03-09
1974-03-26
Application filed by Philips Electronic and Associated Industries Ltd
filed
Critical
Philips Electronic and Associated Industries Ltd
1977-03-09
Publication of GB1466425A
publication
Critical
patent/GB1466425A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
230000003287
optical effect
Effects
0.000
title
abstract
4
230000003179
granulation
Effects
0.000
abstract
9
238000005469
granulation
Methods
0.000
abstract
9
230000008030
elimination
Effects
0.000
abstract
2
238000003379
elimination reaction
Methods
0.000
abstract
2
230000000694
effects
Effects
0.000
abstract
1
239000005337
ground glass
Substances
0.000
abstract
1
239000007788
liquid
Substances
0.000
abstract
1
239000010453
quartz
Substances
0.000
abstract
1
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
silicon dioxide
Inorganic materials
O=[Si]=O
VYPSYNLAJGMNEJ-UHFFFAOYSA-N
0.000
abstract
1
239000007787
solid
Substances
0.000
abstract
1
Classifications
G—PHYSICS
G02—OPTICS
G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 – G02B26/00, G02B30/00
G02B27/48—Laser speckle optics
G—PHYSICS
G02—OPTICS
G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
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
G03H1/32—Systems for obtaining speckle elimination
Abstract
1466425 Controlling light PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 26 March 1974 [29 March 1973] 13430/74 Heading G2F In a system where an optical image is formed by focusing a laser beam on a diffusing element S, e.g. a ground glass screen, and subsequently re-imaged by an objective 02 on a viewing screen P, granulation at P is reduced by placing at least one ultrasonically energized variable refractor T at some point on the optical path. As particularly described the image is produced by deflection at D of a beam from a laser G, but it may be derived from a hologram. In Fig. 2 the refractor T is a solid or liquid medium energized with ultrasonic waves of length approximately equal to the diameter of the granulation «grains» at that point, the resulting refractive index variations deviating components of the incident beam and giving an amplitude and phase re-distribution at the focal spot F. The rapidly charging granulation patterns at F are averaged by the eye. The larger the granulation grains, the more acoustic modulation is required, leading to an enlarged focal spot F, but for the same parameters, elimination of granulation is increased by increasing the aperture of objective O 2 . Elimination of granulation is better if an acoustic wave is used which is aperiodic over the short term, with a coherence length corresponding to that of the optical wave, e.g. by using further acoustic frequencies in element T or a subsequent cell with the same or a different medium. A second ultrasonic wave may propagate at 90 degrees to the first, to give granulation reduction with the same defocusing effect as for a single wave. As shown T is near O 2 but it may also be close to S or P with appropriate diminution of the acoustic wavelength. In a second embodiment; Fig. 3 (not shown), the element T is replaced by a prism, the position or shape of which is charged by ultrasonic waves so as to move the focal spot F over a distance greater than the diversion of a granulation point. The resulting rapidly charging granulation pattern is time averaged by the eye. The prism may be constituted by a quartz plate at acoustic resonance, so that there is a maximum variation in plate thickness at the centre of the plate. One half of the plate only is used as a prism of varying apex angle for the beam deflection. As particularly described, a pair of such plates acting at 90 degrees to each other are disposed between 02 and P and a further plate is disposed before S (M) to move the focus thereat. The pair of plates vibrate synchronously and with such an amplitude that the focus F is rendered stationary.
GB1343074A
1973-03-29
1974-03-26
Transmitting optical information
Expired
GB1466425A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DE2315658A
DE2315658C3
(en)
1973-03-29
1973-03-29
Method and device for reducing or eliminating the granulation occurring in laser beam projections
Publications (1)
Publication Number
Publication Date
GB1466425A
true
GB1466425A
(en)
1977-03-09
Family
ID=5876317
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1343074A
Expired
GB1466425A
(en)
1973-03-29
1974-03-26
Transmitting optical information
Country Status (5)
Country
Link
US
(1)
US3941456A
(en)
DE
(1)
DE2315658C3
(en)
FR
(1)
FR2223717B1
(en)
GB
(1)
GB1466425A
(en)
NL
(1)
NL7404029A
(en)
Families Citing this family (59)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS604401B2
(en)
*
1975-01-21
1985-02-04
コニカ株式会社
interference device
US4035068A
(en)
*
1975-06-25
1977-07-12
Xerox Corporation
Speckle minimization in projection displays by reducing spatial coherence of the image light
US4033683A
(en)
*
1976-07-14
1977-07-05
Tancredi Henry J
Image viewing apparatus
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(en)
*
1977-11-17
1979-05-22
University Of Delaware
Speckle elimination by random spatial phase modulation
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(en)
*
1984-04-30
1984-06-06
Crosfield Electronics Ltd
Modifying coherent radiation
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(en)
*
1987-08-10
1989-02-23
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1989-10-17
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1999-02-23
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Ultrasound transducer with focused ultrasound refraction plate
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(en)
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2001-10-16
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Method of and apparatus for sealing an hermetic lid to a semiconductor die
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1998-07-29
2005-03-29
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Tropel Corporation
Laser illumination with speckle reduction
DE19924519A1
(en)
1999-04-12
2000-10-19
Deutsche Telekom Ag
Method and device for reducing the formation of speckles on a projection screen
WO2000062114A1
(en)
*
1999-04-12
2000-10-19
Deutsche Telekom Ag
Method and device for reducing the formation of speckle on a projection screen
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(en)
2000-02-07
2005-10-18
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Method and apparatus for reducing laser speckle using polarization averaging
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2001-11-27
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Method and apparatus for reducing laser speckle
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Fiber optic transceiver
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2004-06-08
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Method, apparatus, and diffuser for reducing laser speckle
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2001-06-25
2004-08-24
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2001-08-15
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2004-02-17
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Method for domain patterning in low coercive field ferroelectrics
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US20080106779A1
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2008-05-08
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Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3650608A
(en)
*
1969-12-23
1972-03-21
Texas Instruments Inc
Method and apparatus for displaying coherent light images
US3851961A
(en)
*
1971-04-28
1974-12-03
Siemens Ag
Light projection apparatus
1973
1973-03-29
DE
DE2315658A
patent/DE2315658C3/en
not_active
Expired
1974
1974-03-25
US
US05/454,308
patent/US3941456A/en
not_active
Expired – Lifetime
1974-03-26
NL
NL7404029A
patent/NL7404029A/xx
unknown
1974-03-26
GB
GB1343074A
patent/GB1466425A/en
not_active
Expired
1974-03-28
FR
FR7410784A
patent/FR2223717B1/fr
not_active
Expired
Also Published As
Publication number
Publication date
FR2223717B1
(en)
1978-08-11
US3941456A
(en)
1976-03-02
DE2315658B2
(en)
1977-02-10
DE2315658A1
(en)
1974-10-03
DE2315658C3
(en)
1980-11-20
FR2223717A1
(en)
1974-10-25
NL7404029A
(en)
1974-10-01
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Legal Events
Date
Code
Title
Description
1977-07-20
PS
Patent sealed [section 19, patents act 1949]
1981-10-28
PCNP
Patent ceased through non-payment of renewal fee
