FR2320571A1 - Perfectionnements apportes aux appareils de reproduction photographique a rapport image/objet reglable - Google Patents
Perfectionnements apportes aux appareils de reproduction photographique a rapport image/objet reglableInfo
- Publication number
- FR2320571A1 FR2320571A1 FR7524622A FR7524622A FR2320571A1 FR 2320571 A1 FR2320571 A1 FR 2320571A1 FR 7524622 A FR7524622 A FR 7524622A FR 7524622 A FR7524622 A FR 7524622A FR 2320571 A1 FR2320571 A1 FR 2320571A1
- Authority
- FR
- France
- Prior art keywords
- wheatstone bridge
- ohms
- servo motor
- bridge circuit
- photocopier
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/34—Means for automatic focusing therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Lens Barrels (AREA)
- Variable Magnification In Projection-Type Copying Machines (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7524622A FR2320571A1 (fr) | 1975-08-07 | 1975-08-07 | Perfectionnements apportes aux appareils de reproduction photographique a rapport image/objet reglable |
DE19762633708 DE2633708A1 (de) | 1975-08-07 | 1976-07-27 | Fotografisches reproduktionsgeraet |
IT2601376A IT1066935B (it) | 1975-08-07 | 1976-08-04 | Perfezionamenti apportati agli apparecchi di riproduzione fotografica con rapporto immagine oggetto regolabile |
CH998176A CH612016A5 (en) | 1975-08-07 | 1976-08-05 | Photographic copier for which the ratio of the image size to the object size is adjustable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7524622A FR2320571A1 (fr) | 1975-08-07 | 1975-08-07 | Perfectionnements apportes aux appareils de reproduction photographique a rapport image/objet reglable |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2320571A1 true FR2320571A1 (fr) | 1977-03-04 |
FR2320571B1 FR2320571B1 (fr) | 1978-12-01 |
Family
ID=9158879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7524622A Granted FR2320571A1 (fr) | 1975-08-07 | 1975-08-07 | Perfectionnements apportes aux appareils de reproduction photographique a rapport image/objet reglable |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH612016A5 (fr) |
DE (1) | DE2633708A1 (fr) |
FR (1) | FR2320571A1 (fr) |
IT (1) | IT1066935B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2476864A1 (fr) * | 1980-02-25 | 1981-08-28 | Dainippon Screen Mfg | Procede et dispositif de mise au point automatique dans un systeme de projection a grandissement variable |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH658325A5 (de) * | 1982-01-21 | 1986-10-31 | Rudolf Boehme | Vergroesserungsgeraet mit stetiger scharfeinstellung bei veraenderung der bildgroesse durch ein, ueber eine brueckenschaltung und einen verstaerker, gesteuertes objektiv. |
-
1975
- 1975-08-07 FR FR7524622A patent/FR2320571A1/fr active Granted
-
1976
- 1976-07-27 DE DE19762633708 patent/DE2633708A1/de not_active Withdrawn
- 1976-08-04 IT IT2601376A patent/IT1066935B/it active
- 1976-08-05 CH CH998176A patent/CH612016A5/xx not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
NEANT * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2476864A1 (fr) * | 1980-02-25 | 1981-08-28 | Dainippon Screen Mfg | Procede et dispositif de mise au point automatique dans un systeme de projection a grandissement variable |
Also Published As
Publication number | Publication date |
---|---|
DE2633708A1 (de) | 1977-02-17 |
IT1066935B (it) | 1985-03-12 |
FR2320571B1 (fr) | 1978-12-01 |
CH612016A5 (en) | 1979-06-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |