US1458165A

US1458165A - System of electrical control

Info

Publication number: US1458165A
Application number: US412050A
Authority: US
Inventors: William W Coblentz
Original assignee: Individual
Current assignee: Individual
Priority date: 1920-09-22
Filing date: 1920-09-22
Publication date: 1923-06-12
Anticipated expiration: 1940-06-12

Description

SYSTEM OF ELECTRICAL CONTROL Filed Sept. 22, 1920 PHOTO- SENSITIVE CEL Patented dune lZ;

wmn W. COBLEIWZ, OF W a val:

anon, nrs'rnrcr or con srsrm or nrnernronr. common n uccuca at September as, rare. Eerie in. clause.

To all whom it conccm:

Be it known that 1 MW, Connnrrrz, a citizen of the United States of erlca residing at Washington, in the District Columbia, have invented a certain new and useful Improvement in a Sys of Electrical Control, of which the following is a specification.

This invention has reference to imrove it ments in a system of electrical contro, hav-;

ing for its object to provide a novel apparatus and method of thermal radiojdynac control of mechanisms whereby to, render possible the remote control of various mechit anisms possible and practical through the use of light reactive material interposed in the control circuit and adapted, with the projection of} certain colors of light n from a oint distant thereonto, to have its aeelectrica conductivity either increased vor decreased whereby to vary the passa oil.

current through the circuit and to bring about the desired operation.

@ther objects will be in part obvious and as in part pointed out hereinafter.

in order that the invention and its mode of application may he readily understood by persons skilled in the art, l have in the accompanying illustrative drawings and in the detailed following description based thereon, set out several practical 'emi ments of the same. I

In these drawings:

Figure l is a schematic view of one possiso, his system of thermal radio dynamic control; Figure 2 is a similar view illustrating a modified form of control or relay 'Cll'fillit; Figure 3 is a like view of another modico fiedto of control relay circuit; and,

Figure l is a schematic view showing modified form of means for projecting light rays of different colors and of greater and less lengths than 0.65micromil 1m! onto the light ctive or photo-sensitive material.-

Having more particular reference to the drawings, in connection with which characters of reference will designate correto spending parts throughout the several views, and referring in particular toFigure 1, this fo m of the m radio ynamic control may light reactive receiver,

.of reflector 2' so positioned'as to direct parallel light rays onto an angularly position vi condensing mirror 3 arranged at a point dis-' .tant therefrom, which mirror infturn'; serv to direct or reflect the liiht' rays onto'the ereinatter more W fully described. I

The control tem also includes wet my hetermed a control circuit e""'cr a relay 'circult, in which a suitable source of energy 5 1s arrangcd, whilea light reactive l itlmw W 6 is also arranged in one side of this control circuit and is adapt to vary the passage of current throuh the same into an electro cal responsive evice 7 coected therein. This responsive device may, if desired, be in form of a galvanometer, the indicating hand [8 of which is adapted to travel the space between the pointed and 10, which, it de sired, may serve as contact teinals for separate vor individual circuits connected thereto but not. shown. Hence, when the inn dicator is'moved into contact with either of these terminals 9 or 10, the same will serve to close the particular electrical circuits in which thesarne are arranged. @l course it W is not my intention to limit myself to t particular embodiment or to any other specific adaption of my improved system of control, the underlying principle of the invention residing in the provision of an electri cal system of remote control, that is, a systern whereby various mechanisms located at I a distance from. a source of light may have their operations 'controlled by the operator who is positioned in proximity to or adja M cent such light.

The light reactive hody 6 is preferably form oi molyhdenite or sulphide oil molyln denite, although other lormsot photo-sensi-= tive or light reactive materials may he emt5 loyed, such as conditions or preference may ictate, as for example, sulphideot anti mony or selenium or stibnite.

1 and by reason of its coloring which may beeither violet, blue, green, greenish yellow, or yellow, will serve as means for absorption of light rays of wave lengths greater than 0.65 micromillimeters. The light rays so screened when directed onto the light re active body 6 by means of the angularly positioned condensing mirror 3 will serve to decrease the electrical conductivity thereof and in consequence, will decrease the flow of current through the electrical responsive device 7 connected in the control circuit 4 whereb to efiect variation in the positions of the indicator 8 or the return. of the same to its initial starting position whereat it will contact with the terminal 10. To increase the electrical conductivity of the body or receiver 6, a second screen, not shown, is substituted in lieu of the screen 11 and will serve to transmit only light rays of wave lengths greater than 0.65 micromillimeters. This second screen is preferably in form of a ruby glass or the like. Thus, with the ruby screen covering the light source 1, the electrical conductivity of the receiver 6 will be increased, again varying the flow of current through the control circuit 4: and the electrical responsive device 7 connected thereto in order that the indicator 8 will be moved from its initial starting position adjacent the terminal 10 into contact with the terminal 9- for closing the second circuit of the mechanism to be controlled by my improved system. 1

Instead of employing a body of light reactive material such as indicated at 6 in the Figure 1, I have found it practical to also include in the control circuit 4 in lieu thereof, a Wheatstone bridge indicated in its entirety by the numeral 12 having a body of light reactive1material-13 in one am thereof, as clearly shown in the, Figure 2. A galvanometer 14 or other electrical responsive device is connected at opposite points to the arms of the bridge and has

contact terminals

15 and 16 positioned upon either side of and in proximity to. the indicator 17 of such galvanometer.

In employing the arrangement shown in Figure 2, the Wheatstone bridge 12 is positioned in such a manner as will permit the reflection of the colored light rays onto the light reactive body or receiver 13. Star-tin with the bridge 12 balanced in the dar the galvanometer indicator will be caused to swing, say in thedirection of the contact terminals 15, whereby to close the circuit in which the same are interposed when the receiver 13 is exposed to red or infra red radiation, that is, light rays of wave lengths greater than 0.65 micromillimeters. However, when the receiver is exposed to light rays of violet, blue, green,

greenish yellow, or yellow, or rays. of wave aaaaiee I is, into engagement with the contact ter minals 16 for closing the particular circuit in which they are interposed.

As another modification of the form of the invention shown in Figure 2, Imay employ two light reactive receivers such as indicated at 18 and 19 in Figure 3, these receivers being arranged in the opposite arms of the 'Wheatstone bridge 12' which is included in the control or relaycircuit 4; the opposite sides of a galvanometer 14' or other desired electrical responsive device being connected to such opposite arms of the bridge as clearly shown. By this multiple arrangement, t of course will be understood that the sensitivity of the regulating device will be doubled, the

receivers

18 and 19 decreasing in electrical conductivity upon the projection of light rays of wave lengths less than-0.65 micromillimeters thereonto and increasing in their electrical conductivity with the projection of light rays of wave lengths greater than 0.65

' mlcromillimeters, these several actions of the receivers, obviously, causing the flow of current through the arms of the bridge to be changed in direction and to enter the gal vanometer 14' in directions which will cause, optionally, the movement of this indicator 17 into engagement with either the contact terminals 15 or 16' for closing the particular electrical circuits in which they are interposed.

In lieu of the form of light projecting means as schematicall shown in Figure 1, it has also been foun practical to employ that form of apparatus which is also schematically shown in Figure 4, compris-' ing a light source 20, the rays from which are received and collimated by a lens 21 of a spectroscope, whereupon the same are dispersed by direct vision prism 22 and then focused into a spectrum 23 by means of an image forming lens 24 of the spectroscope. An an ularly adjustable mirror 25 is positione in proximity to the image forming lens 24 of the spectroscope and by moving the same to'one sition, the red rays from the spectrum will be reflected therefrom through a lens 26 in order that the same will be projected in parallel onto the light reactive means of the control circuitd, while when the mirror 25 is shifted to its second position, the yellow light rays from the readies,

spectrum 23 will be reflected therefrom through the lens 26 in parallel onto said light reactive means. .By this circuit reilection of light rays of wave lengths greater and less than 0.65 micromillimeters, it is to. be understood that increasing or decreasing of the electric conductivity of the light re active receiver arranged'in the control circuit 4 ma be controlled at will by an operator mere y with the shifting of the mirror 25 to the desired position.

For purpose of illustration, itmay be stated that the circuits controlled by the indicator of the galvanometer or the other movable element of whatever form of electrical responsive device is employed with the control circuit 4 may be adapted. to operate motors in opposite directions in the steering of a torpedo from a remote distance, or other mechanism, such as relays, recording devices, etc.

lit is to be also understood, that l do not confine my invention to a single light reactive receiver or bridge, butthat Various ceiver interposed in a relay circuit, whereby to increase or decrease the electrical conductivity of said receiver to vary the flow of current through an electrical responsive device connecte in such circuit.

2. A method of thermal radio dynamic control consisting in the directing of rays of thermal radiation onto a photosensitive body interposed in a relay circuit for either increasing or decreasing the conductivity of said body dependent upon the intensity and wave length of suchrays for causing operation oifan electrical responsive device interposed in the relay circuit.

3. A method of thermal radio dynamic control consisting in the projection'of rays of thermal radiation onto a light reactive body interposed in a relay circuit, the source of such thermal ray-s being at a point re-- mote from the light reactive body whereby to increase or decrease theelectrical con- 'ductivity of such light reactive body to edect operation of an electrical responsive device connected to the relay circuit, and a modulation of the thermal rays adjacent the source thereof for either increasing or decreasing their intensity and wave lengths.

d. A thermal radio dynamic control apparatus comprising a light source, an electric relay circuit remote from such source, anelectrical responsive device in the relay circuit, photosensitive; means interposed in one side of said circuit adapted to receive the light rays emitted by said source, and means for modulating the light rays emitted by such source to vary the intensity and Wave length thereof to increase or decrease electrical conductivity of the photosensitive means dependent upon their wave lengths. 5. Athermal radio dynamic control apparatus comprisingia light source, an elec tric relay circuit remote'from said source, an electrically responsive device interposed in the circuit, a photosensitive body in one side-of such circuit adapted to have the rays emitted by said source directed thereonto, and means for selectively colorin the light rays emitted by said source whereby to vary the intensity and wave length thereof for efiecting increase or decrease in the electrical conductivity of said body.

6. A thermal radio dynamic control apparatus comprising a light source," an electric relay circuit remote from such source, a Wheatstone bridge in the circuit having certain of its arms formed of a photo-sensitive material and adapted to receive the light rays emitted by said source, an electrically responsive device connected to the bridge, and means for selectively changing the intensity and wave length of the rays of thermal radiation emitted by said light source whereby to increase or decrease the conductivity of the photo-sensitive material.

7. Athermal radio dynamic control a paratus comprisin an electric relay circuit, a Wheatstone bri e in the circuit, certain of the armsof sai bridge being formed of molybdenite and adapted to receive light rays emitted by said source, an electrically till responsive device connected to the bridge, I

and means foriselectively changing the thermal rays emitted by the light source whereby to increase or decrease their intensity and wave lengths for varying accordingly, the

electric conductivity of said molybdenitearms.

8. A thermal radio dynamic control ap- I paratus comprising a light source, an electrlc relay circuit remote from such source, a Wheatstone bridge 1n c rcuit, one of the.

whereby to. increase or decrease, accordingly, jn

the electric conductivity of the molybdenite arm.

Mill

Hill

arms of said bridge being tormed of a photo- 9. A thermal radio dynamic control apparatus comprising a light source, an electric relay circuit remote from such source, a Wheatstone bridge interposed in the circuit, certain of the arms of said bridge being formed of molybdenite adapted .to be ex- 5 posed to the action of rays from said light source, an electrically responsive device con nected to the bridge, and means adjacent such light source for selectively coloring the rays emitted therefrom whereby to change the intensity and wave lengths of the same to accordingly increase or decrease the electrical conductivity of said molybdenite arms. 7 W1LLIAM W. GOBLENTZ.