GB1510704A - Scanning electron microscope system - Google Patents
Scanning electron microscope systemInfo
- Publication number
- GB1510704A GB1510704A GB14352/75A GB1435275A GB1510704A GB 1510704 A GB1510704 A GB 1510704A GB 14352/75 A GB14352/75 A GB 14352/75A GB 1435275 A GB1435275 A GB 1435275A GB 1510704 A GB1510704 A GB 1510704A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- scanning signal
- order term
- april
- transistors
- 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
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
- H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06G—ANALOGUE COMPUTERS
- G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
- G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
- G06G7/20—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating powers, roots, polynomes, mean square values, standard deviation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
- H03K6/04—Modifying slopes of pulses, e.g. S-correction
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Software Systems (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Details Of Television Scanning (AREA)
Abstract
1510704 Cathode-ray tube circuits PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 8 April 1975 [11 April 1974] 14352/75 Heading H4T [Also in Division G4] In a scanning electron microscope system, Fig. 4 (not shown), including a deflection system generating a television type raster, and in which image distortion is reduced by deducting a third order term from the scanning signal the third order term is generated by a circuit that is unaffected by the frequency of the scanning signal so that a variable frequency scan can be used. A first pair of transistors 20, 21 produce across their collectors a signal proportional to the signal applied to their bases and the current flowing in common collector load transistor 24, i.e. the square of the scanning signal applied at 32. A similar pair of transistors 22, 23 with common transistor 25, produce the cube of the scanning signal and supply it to output operational amplifier 42 from which it is deducted from the orginal signal in an undisclosed manner. In an alternative embodiment, Fig. 3, the third order term is generated by including between input terminal and output amplifier, a voltage-dependent resistor the voltage across which is proportional to I<SP>x</SP> where x is between 0À25 and 0À4.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7404944A NL7404944A (en) | 1974-04-11 | 1974-04-11 | FREQUENCY INDEPENDENT S-CORREKTION FOR A TELEVISION DISPLAY SYSTEM. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1510704A true GB1510704A (en) | 1978-05-17 |
Family
ID=19821154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14352/75A Expired GB1510704A (en) | 1974-04-11 | 1975-04-08 | Scanning electron microscope system |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS50139615A (en) |
| AU (1) | AU7992275A (en) |
| BE (1) | BE827745A (en) |
| BR (1) | BR7502112A (en) |
| DE (1) | DE2514476A1 (en) |
| FR (1) | FR2267672A1 (en) |
| GB (1) | GB1510704A (en) |
| NL (1) | NL7404944A (en) |
| SE (1) | SE402512B (en) |
-
1974
- 1974-04-11 NL NL7404944A patent/NL7404944A/en not_active Application Discontinuation
-
1975
- 1975-04-03 DE DE19752514476 patent/DE2514476A1/en not_active Ceased
- 1975-04-08 JP JP50042687A patent/JPS50139615A/ja active Pending
- 1975-04-08 GB GB14352/75A patent/GB1510704A/en not_active Expired
- 1975-04-08 SE SE7503978A patent/SE402512B/en unknown
- 1975-04-08 AU AU79922/75A patent/AU7992275A/en not_active Expired
- 1975-04-08 BR BR2693/75D patent/BR7502112A/en unknown
- 1975-04-09 BE BE155245A patent/BE827745A/en unknown
- 1975-04-11 FR FR7511373A patent/FR2267672A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JPS50139615A (en) | 1975-11-08 |
| SE402512B (en) | 1978-07-03 |
| NL7404944A (en) | 1975-10-14 |
| BE827745A (en) | 1975-10-09 |
| BR7502112A (en) | 1976-02-10 |
| FR2267672A1 (en) | 1975-11-07 |
| AU7992275A (en) | 1976-10-14 |
| SE7503978L (en) | 1975-10-13 |
| DE2514476A1 (en) | 1975-10-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |