US802598A - Process for preparing autotype-negatives. - Google Patents
Process for preparing autotype-negatives. Download PDFInfo
- Publication number
- US802598A US802598A US25885405A US1905258854A US802598A US 802598 A US802598 A US 802598A US 25885405 A US25885405 A US 25885405A US 1905258854 A US1905258854 A US 1905258854A US 802598 A US802598 A US 802598A
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- United States
- Prior art keywords
- screen
- autotype
- negatives
- preparing
- negative
- 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.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
Definitions
- the object of this invention is to clear the lights of autotype or photomechanical printing-plates, in which, as is well known, the ordinary printing process leaves small points on the surface where these surfaces ought to be perfectly white, this clearing' being effected by means of a subsequent exposure of the negative to light through a second screen of a diierent kind.
- Figure l represents the first or cross screen used in my improved process.
- Fig. 2 represents the sec ond or point screen. picture to be reproduced.
- Fig. la represents the negative of said picture when produced 'by the iirst screen only, and Fig. 2 represents said negative when produced by both screens.
- the object of the invention is to reduce the openings of the negative shown in Fig. la to about one-half at the light portions of the picture.
- the process consists in systematically removing the single elements which the crossscreen, Fig. l, leaves in the lights of the picture-c1 e., in the shadows of the negative, Fig. l, To this effect the negative after being exposed to the cross-screen is exposed to the action of a point-screen, Fig. 2, in which the distance between the centers oi' the covered elements is equal to double the distance between the centers of the openings in the crossscreen.
- a process-negative prepared in the ordinary way in a screen-camera bei'ore Fig. 3 represents the being developed is subjected to a short second exposure after the cross-screen has been replaced by a point-screen.
- Vhat I claim is l.
- a process vof preparing autotype-negatives which consists in iirst exposingthe negative through a cross-screen and then exposing' it through a screen provided, at the points corresponding to the openings of the crossscreen, with uniformly-alternating covered and uncovered elements, substantially as speciiied.
- a process olI preparing' autotype-negatives which consists in iirst exposing the negative through a cross-screen and then exposing it through a point -screen, substantially as specified.
- a process of preparing autotype-negatives which consists in iirst exposing the negative through a cross-screen, and then exposing it through a point-screen, the distance between the centers oi' the covered elements of the point-screen, corresponding to double the dis tance between the centers of the openings of the cross-screen, substantially as speciiied.
Description
No. 802,598. PATBNTED 00T. 24, 1905. G. RICHTER. PROCESS POR PREPARIISYG AUTOTYPE NEGATIVES.
APPLICATION FILED MAYI, 1905.
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(QA/MVM E MQW M UNITED STATES PATENT OFFICE.
PROCESS FOR PREPARING AUTOTYPE-NEGATIVES.
Specicaton of Letters Patent.
- Patented Oct. 24, 1905.
Application filed May 4,1905. Serial No. 258,854.
T0 {n/f 7071/0711, it 711/653./ cm1/cern:
Be it known that I, CARL RICHTER, a citizen of the German Empire, and a resident of Bremen, Germany, have invented certain new and useful Improvements in Processes l'or Preparing Autotype-Negatives, of which the following is a speciiication.
The object of this invention is to clear the lights of autotype or photomechanical printing-plates, in which, as is well known, the ordinary printing process leaves small points on the surface where these surfaces ought to be perfectly white, this clearing' being effected by means of a subsequent exposure of the negative to light through a second screen of a diierent kind.
In the accompanying drawings, Figure l represents the first or cross screen used in my improved process. Fig. 2 represents the sec ond or point screen. picture to be reproduced. Fig. la represents the negative of said picture when produced 'by the iirst screen only, and Fig. 2 represents said negative when produced by both screens.
Brieily stated, the object of the invention is to reduce the openings of the negative shown in Fig. la to about one-half at the light portions of the picture.
The process consists in systematically removing the single elements which the crossscreen, Fig. l, leaves in the lights of the picture-c1 e., in the shadows of the negative, Fig. l, To this effect the negative after being exposed to the cross-screen is exposed to the action of a point-screen, Fig. 2, in which the distance between the centers oi' the covered elements is equal to double the distance between the centers of the openings in the crossscreen. Thus a process-negative prepared in the ordinary way in a screen-camera bei'ore Fig. 3 represents the being developed is subjected to a short second exposure after the cross-screen has been replaced by a point-screen. In this way the lights of the negative are 'further exposed, but only at those places which are not protected by the covered parts of the point-screen. A copy prepared by this negative, Fig. 2, appears in the deep portions like one prepared by the ordinary screen process; but the number oi' printing elements in the lights is reduced by one-half, so that a much deeper etching oi the plates is rendered possible.
Vhat I claim is l. A process vof preparing autotype-negatives which consists in iirst exposingthe negative through a cross-screen and then exposing' it through a screen provided, at the points corresponding to the openings of the crossscreen, with uniformly-alternating covered and uncovered elements, substantially as speciiied.
2. A process olI preparing' autotype-negatives which consists in iirst exposing the negative through a cross-screen and then exposing it through a point -screen, substantially as specified.
3. A process of preparing autotype-negatives which consists in iirst exposing the negative through a cross-screen, and then exposing it through a point-screen, the distance between the centers oi' the covered elements of the point-screen, corresponding to double the dis tance between the centers of the openings of the cross-screen, substantially as speciiied.
Signed by me at Bremen, Germany, this 22d day of April, 1905.
CARL RICHTER. l/Vitnesses:
WV. SHEELE, GG. JANssnN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US25885405A US802598A (en) | 1905-05-04 | 1905-05-04 | Process for preparing autotype-negatives. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US25885405A US802598A (en) | 1905-05-04 | 1905-05-04 | Process for preparing autotype-negatives. |
Publications (1)
Publication Number | Publication Date |
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US802598A true US802598A (en) | 1905-10-24 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US25885405A Expired - Lifetime US802598A (en) | 1905-05-04 | 1905-05-04 | Process for preparing autotype-negatives. |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2430498A (en) * | 1943-09-21 | 1947-11-11 | Victor C Ernst | Gelatin printing plate process |
US2528007A (en) * | 1947-10-25 | 1950-10-31 | Hagop H Kubeserian | Method for producing gravure printing plates |
US2533650A (en) * | 1944-08-23 | 1950-12-12 | Powers Photo Engraving Company | Process of making half-tone negatives |
-
1905
- 1905-05-04 US US25885405A patent/US802598A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2430498A (en) * | 1943-09-21 | 1947-11-11 | Victor C Ernst | Gelatin printing plate process |
US2533650A (en) * | 1944-08-23 | 1950-12-12 | Powers Photo Engraving Company | Process of making half-tone negatives |
US2528007A (en) * | 1947-10-25 | 1950-10-31 | Hagop H Kubeserian | Method for producing gravure printing plates |
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