GB252387A - Improvements in or relating to scanning devices for television systems - Google Patents
Improvements in or relating to scanning devices for television systemsInfo
- Publication number
- GB252387A GB252387A GB12946/26A GB1294626A GB252387A GB 252387 A GB252387 A GB 252387A GB 12946/26 A GB12946/26 A GB 12946/26A GB 1294626 A GB1294626 A GB 1294626A GB 252387 A GB252387 A GB 252387A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirror
- receptacle
- crystals
- mirrors
- image
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
- H04N3/08—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving reflector
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Abstract
252,387. Metropolitan-Vickers Electrical Co., Ltd., (Assigness of Whitten, W. H.). May 25, 1925, [Convention date]. Television apparatus. -The exploring movement of a mirror in a television system is effected by the expansion and contraction of a piezo-electric crystal. Two crystals may be employed, one expanding when the other contracts. The figure shows a transmitting arrangement. The crystals 4, 5 are each mounted at one end on a base 6 on the wall of a receptacle 8, and their other ends bear against the back of a mirror, comprising a deposit 3 of silver on a glass support 2, one at each side of a controlling spring 9. Metal plates 10, 11 and 12, 13 arranged on either side of the crystals 4, 5 respectively are connected as shown to an a-c generator 15 producing e.g. 1000 cycles per sec. A fixed mirror comprising a surface 18 of silver on a glass support 16 is mounted in the receptacle 8 behind the oscillating mirror 3, and the receptacle is filled with a mixture of alcohol and glycerine having a refractive index equal to that of the glass supports 2, 16. The image 22 to be transmitted is focussed by a lens 21 on to the mirror 18 and the beam, after repeated reflection as shown from the two mirrors, is incident on a third mirror 24 mounted on an armature 27 oscillated about an axis 29 at right angles to the axis of the mirror 3 by a polarized electromagnet 26 to which current is supplied from an a-c generator 31 at e.g. 16 cycles per sec. The beam reflected from the miror 24 traverses a photoelectric cell 30 and light from successive elements of the image is thus incident on the cell. The image is reproduced at the receiving station by mirrors oscillating synchronously with the mirrors 3 and 24.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US252387XA | 1925-05-25 | 1925-05-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB252387A true GB252387A (en) | 1926-12-02 |
Family
ID=21824861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12946/26A Expired GB252387A (en) | 1925-05-25 | 1926-05-20 | Improvements in or relating to scanning devices for television systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB252387A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2581780A (en) * | 1945-10-23 | 1952-01-08 | Ahier Georges Charles | Method and means for phase and frequency modulation |
US3436139A (en) * | 1965-07-20 | 1969-04-01 | Rca Corp | Torsional light deflector |
US3437394A (en) * | 1966-07-26 | 1969-04-08 | Nasa | Electromagnetic mirror drive system |
US3506328A (en) * | 1966-11-25 | 1970-04-14 | Hitachi Ltd | Light deflection device |
US3758199A (en) * | 1971-11-22 | 1973-09-11 | Sperry Rand Corp | Piezoelectrically actuated light deflector |
US4533219A (en) * | 1984-03-14 | 1985-08-06 | Itek Corporation | Tip-tilt mirror actuation system employing a single control voltage |
US4690486A (en) * | 1985-04-29 | 1987-09-01 | Texas Instruments Incorporated | Four position interlacing apparatus |
US5313137A (en) * | 1989-11-30 | 1994-05-17 | Wittey Malcolm G | Display devices |
-
1926
- 1926-05-20 GB GB12946/26A patent/GB252387A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2581780A (en) * | 1945-10-23 | 1952-01-08 | Ahier Georges Charles | Method and means for phase and frequency modulation |
US3436139A (en) * | 1965-07-20 | 1969-04-01 | Rca Corp | Torsional light deflector |
US3437394A (en) * | 1966-07-26 | 1969-04-08 | Nasa | Electromagnetic mirror drive system |
US3506328A (en) * | 1966-11-25 | 1970-04-14 | Hitachi Ltd | Light deflection device |
US3758199A (en) * | 1971-11-22 | 1973-09-11 | Sperry Rand Corp | Piezoelectrically actuated light deflector |
US4533219A (en) * | 1984-03-14 | 1985-08-06 | Itek Corporation | Tip-tilt mirror actuation system employing a single control voltage |
US4690486A (en) * | 1985-04-29 | 1987-09-01 | Texas Instruments Incorporated | Four position interlacing apparatus |
US5313137A (en) * | 1989-11-30 | 1994-05-17 | Wittey Malcolm G | Display devices |
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