US2434157A - heppeard - Google Patents
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- Publication number
- US2434157A US2434157A US2434157DA US2434157A US 2434157 A US2434157 A US 2434157A US 2434157D A US2434157D A US 2434157DA US 2434157 A US2434157 A US 2434157A
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- United States
- Prior art keywords
- circuit
- switch
- section
- heppeard
- grid
- 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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- 229940035295 Ting Drugs 0.000 description 2
- 230000000903 blocking Effects 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N tin hydride Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
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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
- G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
Definitions
- Figure 5 is a sehematie wiring set by an operator and the device will be t-heremodification of this phototimer
- Figure 6 is a fragmentary section taken on the ure 1.
- Figure 3 is a Iraugxnenbary 5 line 3-3 of Figure 1,
- Figure 4 is a frag itlll'illl), cation. taken on the mentary detailed section of diagram of a warma? :fiertube comprisingiairectifierzisectiomand; an
- circuit. means actuated by said plate: circuit ,fOD :operating gsaid switch ifor rselective connection to;;sa-id *safevlight or :said iexposure flight, means: supplying a --,charg e onithe: grid Of!
- switch operating meansl connecting theswitch'to the safe lightiirr one -position- .and. -to the .exposure light in another position;
- An electronic phototimer comprising, a
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Radiation-Therapy Devices (AREA)
Description
Jan. 6, 1948. s, HEPPEARDv 2,434,157
ELECTRONIC PHOTO TIMER Filed Nov. 18, 1946 2 Sheets-Sheet l afij eppeari Jan. 6, 1948- c. s. HEPPEARD 2,434,157
ELECTRONIC PHOTO TIMER Filed Nov. 1a, 1946 2 SheetS -Sheet 2 Patented Jan. 6, 1948 rim .1 h i mmrm'rmm OFFICE ."kpmliv rill. rh-rhd NIL "11135115" 1:: uhiime. Hi. 1H5 mm) "El-fins invention xc'katcs timer.
It is an object of this invention to provide an electronic phototimer for photoenlai'gers and printers, of operation 5 the platen switch whereby the length of exposure may be initially Figure 5 is a sehematie wiring set by an operator and the device will be t-heremodification of this phototimer,
Figure 6 is a fragmentary section taken on the ure 1.
i.- to an cluctrorxic photo- Figure 2 1:; u HulluHULLlC \Vil'illl; (H
Figure 3 is a Iraugxnenbary 5 line 3-3 of Figure 1,
Figure 4 is a frag itlll'illl), cation. taken on the mentary detailed section of diagram of a wanna? :fiertube comprisingiairectifierzisectiomand; an
and cathode: ofisaidrectifier. section; meanmconnectingasupply:circuitztoxsaidrdevice; a sat e .light and :811': exposure 'alightivconnected i to said';switch, said 1' means connecting: touthe-scathodesiof a said "sections, aswitch tin, saidnsupply; "circuit. means actuated by said plate: circuit ,fOD :operating gsaid switch ifor rselective connection to;;sa-id *safevlight or :said iexposure flight, means: supplying a --,charg e onithe: grid Of! said: :pentode- F section for; blocking said; plate --circuit;, andwmeans dissipating V said charge ron said grid; whereby-saidswitch 1wi1lube connectedwtoithe aotherzof :said lights; K
plifier :tu 'e zcomprisingiaz rectifier sectioniand an amplifier; section; aiplaiieicircuit i. across said :tube
connected: -to the plate; ofgsaidiamplifier :section and :ca-thode of said :rectifier section; means; con- 1 necting :a \supply circuit ,to; said --device,-v saidsupply circuit-Jconn'eotin cto the cathodes. of-,said
switch operating meanslconnecting theswitch'to the safe lightiirr one -position- .and. -to the .exposure light in another position;
11 An electronic phototimer comprising, a
switch for selectivelyzconneoting asaielight or an c ,exposureelight into the circuit of 'a source: of electric supply,a rectifieneamplifier tube havingsa :rectifierssectionzand atzpentodezsectlonri apswitch operatorrconnected'between said-rectifler and1pen- *todeisBct-ions operatin asaidz switch in cnmdirec- Jaionby current throughsa-id sections; a-condenser connecting to: the: grid of said: pentode' section for supplying an. electric chargethereto blockingflhe current itorsaid operator-and actuating said switch inttheother direction; and-means-dissipatingg said electric charge on :-said grid re-establishing the current itoasaid operator iior returning said- =oper- 'ator to-itsinitial -position,iand means :-varying the length of time of 'dissipatings the charge on said grid.-
12.- An electronicphototimer having aswitch for; connecting an .-exposure-1ight into an electric supply circuit and an'electro-magnetic operator for saidswitch-mormally holding ,said switch in exposure light :-circuit breaking aposition, rectifying means connected between one sideof said .operator and said. supply circuit, amplifying meanssconnected between the :other side of said operatortandsaid circuit, acondenser connected to;said amplifying meansifonblocking said circuit .to said ioperator, land a resistor connected ,across said .condenser for restoring said circuit after. aselected length of time, said switch con- Anec'ting said ..exposure light insaid supply circuit during .the time saidr-condenservblocks the circuit.
CHESTERTS. :HEPPEARD.
REFERENCES" 'CITE'D' Thetfollowingi references are of: record in the file --of this patent:
EUNITED STATES PATENTS Name Date Haar Jan. 10, 1939 "Number 2;1 43,c92tv Jam 6,, T1948. P. A. HERR 2,434,158
FILLED BAG SEWING MACHINE Filed Aug. 1, 1945 2 Sheets-Sheet l
Publications (1)
Publication Number | Publication Date |
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US2434157A true US2434157A (en) | 1948-01-06 |
Family
ID=3435747
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US2434157D Expired - Lifetime US2434157A (en) | heppeard |
Country Status (1)
Country | Link |
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US (1) | US2434157A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2473640A (en) * | 1947-11-05 | 1949-06-21 | Raytheon Mfg Co | Electrical circuits |
US2605447A (en) * | 1950-07-17 | 1952-07-29 | John H Troup | Enlargement photography |
US3798464A (en) * | 1971-09-11 | 1974-03-19 | Philips Corp | Electronic timer |
US3814949A (en) * | 1972-09-18 | 1974-06-04 | S Weinberg | Timing control device |
-
0
- US US2434157D patent/US2434157A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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None * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2473640A (en) * | 1947-11-05 | 1949-06-21 | Raytheon Mfg Co | Electrical circuits |
US2605447A (en) * | 1950-07-17 | 1952-07-29 | John H Troup | Enlargement photography |
US3798464A (en) * | 1971-09-11 | 1974-03-19 | Philips Corp | Electronic timer |
US3814949A (en) * | 1972-09-18 | 1974-06-04 | S Weinberg | Timing control device |
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