April 17, 1951 D. W. EPSTEN 2,549,072 RECORDING APPARATUS FOR RADAR SYSTEMS Filled Feb. 27, l946 2 Sheets-Sheet
raerezerezprzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz! ?
INVENTOR. VIZAŽorzeiz7.
4 Z7ZJAPAVEV. April 17, 1951 D. W. EPSTEIN 2,549,072 RECORDING APPARATUS FOR RADAR SYSTEMS Filed Feb. 27, 1946 2 Sheets-Sheet 2
AZAM/AAM7S
774/vsaaatzW7 4.74744 /?Z/? z
INVENTOR. A27/žazº VZ Av/ein BY C94.
4772A
Patented Apr. 17, 1951 2,549,072
UNITED STATES PATENT OFFICE 2,549,072 RECORONG APPARATUS FOR RADAR SYSTEMIS David W. Epstein, Princeton, N. J., assignor to Radio Corporation of America, a corporation of Delaware Application February 27, 1946, Seria No. 650,708 3 Claims. (C. 250-50)
- My invention relates to signal receiving Systems the following description taken in connection wherein images produced on luminescent Screens with the accompanying drawing in which or the like are transferred to the storage Screen Figure 1 is a block and circuit diagram of the of a cathode ray tube. invention as applied to a radar system, The present invention is particularly applicable Figure 2 is an enlarged view in cross section to systems wherein a radar picture is produced of the screen used in the cathode ray tube shown on a luminescent screen and wherein it is de in Fig. 1 of the drawing, sired to transmit the radar picture to a remote Figure 3 is a view in cross section of another point by utilizing a cathode ray storage tube. embodiment of a screen that may be used in the It has previously been proposed to project Such () cathode ray tube of Fig. 1, and . a radar picture upon a storage Screen by means Figure 4 is a view of the screen of Fig.1 sepa. of a lens system. An arrangement of this kind rated into two portions for the purpose of illus is described and claimed in application Serial No. trating the scanning paths of the cathode rays 500,739, filed August 30, 1943 in the name of in the cathode ray tube of Fig.1. Irving Wolff and entitled Recorder for Radio Lo Fig. 1 shows a pulse-echo radar System corn. cator now Patent No. 2,415,981 issued February prising a radio transmitter that is pulse modu 18, 1947. A serious disadvantage of the Wolff lated by pulses supplied from a pulse generator arrangement is that even with a good lens Sys through a delay network 2 and a pulse keyer or tem a large amount of light is lost with the re modulator 3. The transmitter antenna, 5 may suit that it is sometimes difficult to transmit a 20 be non-directive. Pulses from generator are radar picture properly even though it is clearly also supplied over a conductor 4 to a Sawtooth visible on the luminescent Screen. wave generator 6. The purpose of the delay An object of the present invention is to pro network 2 is to insure that any irregularity at vide an improved method of and means for trans the start of the sawtooth Wave will have ended by mitting a radar picture whereby the above-men 25 the time a reflected pulse is received. tioned difficulty is avoided. The particular radar system illustrated is de A further object of the invention is to provide signed to locate and record reflecting objects lo an improved method of and means for trans cated to the left and to the right of the radar sys ferring a picture from a luminescent screen or tem. For example, the apparatus illustrated may the like to a storage Screen. be carried by an aircraft and used for locating A still further object of the invention is to pro ships at sea. The receiving apparatus comprises vide an improved screen structure for cathode directive antennas and 8 pointing to the left ray tubes. and right, respectively, of the aircraft's line of A still further object of the invention is to flight. Reflected pulses picked up by the antennas. provide an improved cathode ray tube having and 8 are supplied to separate radio receivers signal put-on and signal take-off sections. f8 and 21, respectively, which detect and amplify A still further object of the invention is to the received signals. : . provide an impr