CA1092573A - Cathode ray tube mounting means including lighting means and camera-connecting means - Google Patents
Cathode ray tube mounting means including lighting means and camera-connecting meansInfo
- Publication number
- CA1092573A CA1092573A CA346,400A CA346400A CA1092573A CA 1092573 A CA1092573 A CA 1092573A CA 346400 A CA346400 A CA 346400A CA 1092573 A CA1092573 A CA 1092573A
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- Prior art keywords
- ray tube
- cathode ray
- faceplate
- light bulb
- light
- Prior art date
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Abstract
CATHODE RAY TUBE MOUNTING MEANS INCLUDING
LIGHTING MEANS AND CAMERA-CONNECTING MEANS
Abstract of the Disclosure The present invention relates to a lighting unit for illuminating internal graticule lines on a surface of a cathode ray tube faceplate. The unit is comprised of a front casting including a mounting for removably mounting a cathode ray tube thereon, a bezel surrounding the cathode ray tube faceplate and being mounted on the front costing, and a light guide extending along an edge of the faceplate and having spaced openings therein. A securing unit is provided for securing the light guide onto the bezel in alignment with the spaced openings. A light bulb is disposed in the holes and spaced openings. Conductors are provided on the securing unit, electrically engaging respective terminals of the light bulb. A source of electrical potential is provided, connected to the conductors for energizing the light bulb.
LIGHTING MEANS AND CAMERA-CONNECTING MEANS
Abstract of the Disclosure The present invention relates to a lighting unit for illuminating internal graticule lines on a surface of a cathode ray tube faceplate. The unit is comprised of a front casting including a mounting for removably mounting a cathode ray tube thereon, a bezel surrounding the cathode ray tube faceplate and being mounted on the front costing, and a light guide extending along an edge of the faceplate and having spaced openings therein. A securing unit is provided for securing the light guide onto the bezel in alignment with the spaced openings. A light bulb is disposed in the holes and spaced openings. Conductors are provided on the securing unit, electrically engaging respective terminals of the light bulb. A source of electrical potential is provided, connected to the conductors for energizing the light bulb.
Description
``` 1092573 This is a division of Canadian patent application Serial No. 289,068, filed 19 October 1977.
BACKGROUND OF THE INVENTION
Electrostatic cathode ray tubes are mounted in an electronic cabinet by mounting means at the faceplate and via clamp means that clamp onto the neck. The mounting means generally take the form of rubber or resilient members against which the corners of the CRT faceplate engage. The clamp means clamp onto the CRT neck and it is adjustable to align the faceplate with the bezel so that they are parallel.
Such a mounting arrangement has created several problems.
One problem is that if the CRT faceplate is not properly aligned and is not parallel with the bezel, photographs taken of the information displayed on the CRT screen by a camera removably mounted on the bezel will not provide an accurate photograph of such displayed information.
Another problem is that the resilient mounting members may cause breakage of the faceplate when the instrument is dropped because the resilient mounting members reach their compressed condition at the same time that the resultant force of the instrument cabinet is occurring which substantially increases the forces on the CRT faceplate thereby breaking the faceplate if such forces are in excess of the strength of the faceplate. A further problem is the clamp means takes up room that could better ~e utilized to space components or to position more components therein.
U.S. Patent Nos. 3,268,659 which issued to C.B. Gibson on 23 August 1966; 3,281,618 which issued to L.E. Swedlund on 25 October 1966; 3,361,270 which issued to L.E. Swedlund on 2 January 1968 and 3,683,225 which ... .. . .
- ' ' ' ' - '-~`` 1092S73 issued to M.~. Butler on 8 August 1972 disclose lighting means for lighting internal graticule scale lines of a cathode ray tube. These lighting means are constructed in such a manner and mounted along or around the faceplate that it is very difficult to replace light bulbs, because, in some instruments, the light bulbs are soldered in position, and, in other instruments, it required removing the light guide member which has light bulbs secured therein. The arrangements make it difficult, time consuming and expensive to replace light bulbs.
SUMMARY OF THE PRESENT INVENTION
The present invention is directed to a mounting means and lighting means and more particularly to a cathode ray tube mounting means and lighting means for illuminating the graticule scale lines of a cathode ray tube.
The present invention is realized by the cathode ray tube having wedge-shaped projection means provided on the funnel section which mate with wedging members that are movably mounted in the wall delimiting the opening of the panel member through which the cathode ray tube is passed.
A bezel member having an implosion shield means therein i~
secured onto the panel member with the implosion shield means in engagement with the faceplate of the cathode ray tube. Means connected to the wedging members and for moving the wedging members into tight engagement with the wedge-shaped projection means thereby forcing the cathode ray tube faceplate ~in tight engagement with the implosion shield means. A light bar is positioned between the panel member and the bezel member and is disposed adjacent an edge of the faceplate. A circuit board has light bulbs removably secured thereto and the circuit board is secured to the light bar through the bezel member and the light bulbs are disposed in respective openings in the light bar so that the light bulbs and light bar can illuminate the graticule scale of the cathode ray tube.
An object of the present invention is to provide a - cathode ray tube mounting means.
Another object of the present invention is the provision of cathode ray tube mounting means wherein the cathode ray tube is mounted at its front end only.
A further object of the present invention is to provide a cathode ray tube mounting means that properly aligns the cathode ray tube faceplate with the bezel means so that accurate information can be photographed thereof.
An additional object of the present invention is the provision of a cathode ray tube mounting means that enables the cathode ray tube to be readily mounted securely in position and to properly align the faceplate of the cathode ray tube with bezel means.
A still further object of the present invention is to provide a graticule lighting means for illuminating the internal graticule scale of the cathode ray tube.
Still an additional object of the p~esent invention is the provision of a graticule lighting means having light bulb means that are easily replaceable.
In accordance with an aspect of the invention there is provided lighting-means for illuminating internal graticule lines on a surface of a cathode ray tube faceplate comprising:
front casting means including mounting means for removably mounting a cathode ray tube thereon; bezel means surrounding the cathode ray tube faceplate and being mounted on said front casting means; light guide means extending along an edge of the faceplate and having spaced openings therein;
means securing said light guide means onto said bezel means and including holes therethrough and through said bezel means in alignment with said spaced openings respectively; light bulb means disposed in said holes and spaced openings; con-ductive means provided on said securing means electrically engaging respective terminals of said light bulb means; and means connected to said conductive means for providing elec-. trical potential thereto to energize said light bulb means.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention taken in conjunction with the invention disclosed in Canadian patent application Serial No.
289,068 which was filed on 19 October 1977, will be described in detail hereinbelow with the aid of the accompanying -drawings, in which~
Figure 1 is a perspective exploded view showing the cathode ray tube mounting arrangement;
Figùre 2 is a perspective view showing the wedge-shaped projections on the funnel section of the cathode ray tube and the wedging members matable therewith;
Figure 3 is a side elevational view showing the cathode ray tube in a mounted position;
Figure 4 is a perspective exploded view showing the : .. - - ~-, . . . .. . .... . . :
- ~ .~ '' : '`
lighting means and camera-connecting means;
Figure 5 is a part ccoss-sectional view taken along lines 5-5 of Figure 4; and Figure S is a part cross-sectional view taken along lines 6-6 of Figure 4.
DETAILED DESCRI PTION OF THE INVENTION
Turning now to Figures 1-3, a cathode ray tube 10 is preferably of the type disclosed in U.S. Patent No.
3,207,936, which issued to W.H. Wilbanks, et al on 21 September 1965 but it can be any type of tube that will operate as required. Tube 10 has a ceramic funnel section 12 to the front end of which is frit sealed via frit 13 (Fig. 4) a flat faceplate 14 which is made of a suitable glass. A conventional graticule scale 16 as shown in Figure 5 is generally in the form of intersecting lines of glass frit fused to the inner surface of - 4a -faceplate 14 but they can be formed of light reflecting and diffusing material such as titanium dioxide deposited on the inside surface of the faceplate or by grooves that are etched or scribed into such rear surface as disclosed in U.S. Patent Nos. 3,683,225; 3,361,270; 3,281,618 and 3,268,659 previously identified. A conventional phosphor layer 1 is deposited or coated over graticule scale 16 along the inner surface of faceplate 14 and it may function as a conventional phosphor screen, or it may also operate as a storage dielectric of a direct-viewing bistable storage tube of the type disclosed in U.S. Patent No.
3,214,631 which issued to Robert H. Anderson on 26 October lq65 in which case a thin light transparent conductive layer of tin oxide (not shown) is provided beneath the phosphor layer. Of course, even when phosphor layer 18 functions as a storage dielectric, it can also operate as a conventional phosphor viewing screen for emitting a light image of the charge image stored on such dielectric.
Funnel section 12 has wedge-shaped projections 20 20 thereon and these projections can be formed as part of funnel section 12 or they can be secured onto funnel section 12 by use of a suitable adhering material such as for example an epoxy resin. The funnel section can be made from glass if desired. Projections 20 are located adjacent the front end of the funnel section so that a faceplate 14 is also fr~t sealed to projections 20 as well as the front edge of the funnel section.
Front casting 22 has an opening through which the ~athode ray tube 10 is introduced into the cabinet. U-3C shaped guides 24 are provided by opposing inside surfacesdelimiting the opening in casting 22. The inside surface of guides 24 conform to the exterior surface of wedging members 26 which are slidably mounted therein. Radiussed projection 28 is provided by wedging members 26 which have a screw 30 -5a-109~573 threadably di~posed therein. The inside surface of wedging members 26 has a wedge shape for matable engagement with respective projections 20. Wedging members 26 are preferably molded from a suitable plastic material such as for example plastic material marketed under the trademark DELRIN.
A bezel 32 has a transparent implosion shield 34 therein and bezel 32 is secured onto casting 22 via screws 36. After bezel 32 has been secured onto casting 22, screws 30 are tightened through openings 38 in bezel 32 in align-ment with screws 30 thereby causing wedging members 26 tomove along guide members 24 and along projections 20 whereby faceplate 14 is moved into tight engagement with implosion shield 34 through the action of wedging members 26 on pro-jections 20. The cathode ray tube is now tightly and securely mounted in position on casting 22 at the front end of the cathode ray tube. Such action places the faceplate parallel with the bezel so that proper alignment takes place and photographs taken of information displayed on the screen will be accurate. Casting 22 is secured to corner mounting members of the type disclosed in U.S. Patent 4,123,129 which issued to M. D. Butler on 31 October 1978 which forms a frame that will result in an electronic cabinet for housing a cathode ray tube and associated electronic circuitry. If the cathode ray tube needs to be replaced, it can readily be done by removing the bezel and loosening screws 30. The plastic wedging members 26 serve as shock abosorbers if the instrument is subjected to an undue shock.
Turning now to Figures 4-6, a graticule lighting means is illustrated. A light guide 40 is preferably molded from a suitable plastic material such as methyl methacrylate and it includes projections 42 that mate with holes 44 in bezel 32. Holes 46 extend through projections 42 and light .
guide 40. Projections 48 extend outwardly from both sides of light guide 40 and mate with holes 50 and 52 in bezel 32 and casting 22 respectively; whereas projections 54 mate with holes 56 in bezel 32. A white tape 58 is adhered onto the bottom of light guide 40 and a white tape (not shown) is adhered onto the sides and top of faceplate 14.
A printed circuit board 60 has a circuit path 62 located on an outer surface which surrounds openings 64 and which make electrical contact with an outer terminal of 10 light bulbs 66. Another circuit path 68 (Figure 5) is provided on the inner surface of circuit board 60, and it is connected to contact members 70 which are pivotally mounted on the circuit board to enable light bulbs 66 to be inserted into openings 64 when they are in the position shown in Figure 4 and they are then moved into engagement with the inner terminals of light bulbs 66 as shown in Figure 5 to provide electrical contact thereto and to maintain light bulbs 66 in position. Circuit paths 62 and 68 are connected .
respectively to electrical terminal pins 72 and 74.
In assembly and before bezel 32 is secured onto front casting 22, ligh$ guide 40 is positioned on a bottom inner surface of bezel 32 with projections 42, 48 and 54 - extending through holes 44, 50 and 56, respectively. A thin strip of insulating material 76 having holes therethrough that mate with holes 44, 50 and 56 is positioned onto the bottom outer surface of bezel 32 whereafter circuit board 60 is positioned-in engagement with insulating strip 76 with terminal posts 72 and 74 extending through holes in pro-jections 48. Screws 78 are then passed through holes 80 in circuit board 60 and threadably engage holes in projections 54 thereby securing light guide 40 and circuit board 60 in position on the bottom inner and outer surfaces respectively ,: - , , , of bezel 32. Bezel 32 with implosion shield 34 in position therein can now be secured to front casting 22 via screws 36 with projections 48 extending through holes 52 in front casting 22. Screws 30 are then tightened through holes 38 thereby securing the cathode ray tube in position against the implosion shield via wedging members 26 and projections 20 as described hereinbefore.
Arcuate depressions 40a are provided in the upper edges of light guide 40 in alignment with holes 46 to restrict the area where the light is transmitted from light guide 40 into the faceplate to illuminate the internal graticule 16 in order to eliminate light spots that would be created by the filaments of light bulbs 66.
A cover 82, which is preferably molded from a suitable plastic material, is provided with integral spring latches 84 which mate with oblong openings 86 in bezel 32 thereby latchably maintaining cover 82 in position. A
filter (not shown) can be postioned in cover 82 and held in position against bezel 32 by cover 82 to filter out any undesired light. Cover 82 can be removed and this permits ready replacement of burned out bulbs 66.
An electrical connector assembly 86 including an insulating housing and electrical receptacles therein is connected to terminal pins 72 and 74 to provide electrical potential to light bulbs 66.
A camera-connecting means can also beprovided as ~ -shown in Figures 4 and 6. An insulating contact carrier 88 is molded from a suitable dielectric material with pins 90 in position therein at spaced intervals. Annular projections 3Q 92 surrounding part of pins 90 are provided by carrier 88 and they mate with holes 94 located in the middle of the left side of front casting 22 so that projections 92 insulate " - , - - - , , . ~ ,............................. .
-- ' ' ' :
pins 90 from casting 22 and carrier 88 abuts thereagainst.
A flange 96 is provided on the top, bottom and inner side of carrier 88 and it abuts against bezel 32 which permits the front section of carrier 88 to extend through rectangular opening 98 in the middle of the left side of bezel 32.
Bezel 32 maintains carrier 88 in position when it is secured onto casting~22. Pins 90 have right-angled contact sections 100 that extend along the top surface of carrier 88 to provide electrical power to an oscilloscope camera (not shown) of the type disclosed in U.S. Patent No. 3,149,903 which issued to M. J. Merrick on 22 September 1964 which is mounted in position on bezel 32 via grooves 102 and 104. An electrical connector assembly 106 similar to connector assembly 86 makes electrical connection with pins 90 to provide electrical potential thereto.
Electrical connector assemblies 86 and 106 can be of the type disclosed in U.S. Patent No. Re 28,147 which issued to E. P. Hoffman on 3 September 1974.
As can be discerned from the foregoing, there has been disclosed a cathode ray tube mounting arrangement that enables easy and accurate mounting of a cathode ray tube in position in an electronic cabinet so that the cathode ray tube is properly aligned and to enable fast an easy replace-ment of the CRT when necessary. Also disclosed is a graticule lighting arrangement that enables the elements of the graticule lighting arrangement to be easily and readily mounted in position and to permit easy replacement of burned out light bulbs~
It will be obvious to those knowledgeable of the particular art to which this invention pertains that many _g_ .
.
~ , - .
.
changes may be made in details of the above-described embodi-ments of the present invention without departing from the spirit thereof. Therefore, the scope of the present invention is to be determined by the following claims.
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.. ... . . .
BACKGROUND OF THE INVENTION
Electrostatic cathode ray tubes are mounted in an electronic cabinet by mounting means at the faceplate and via clamp means that clamp onto the neck. The mounting means generally take the form of rubber or resilient members against which the corners of the CRT faceplate engage. The clamp means clamp onto the CRT neck and it is adjustable to align the faceplate with the bezel so that they are parallel.
Such a mounting arrangement has created several problems.
One problem is that if the CRT faceplate is not properly aligned and is not parallel with the bezel, photographs taken of the information displayed on the CRT screen by a camera removably mounted on the bezel will not provide an accurate photograph of such displayed information.
Another problem is that the resilient mounting members may cause breakage of the faceplate when the instrument is dropped because the resilient mounting members reach their compressed condition at the same time that the resultant force of the instrument cabinet is occurring which substantially increases the forces on the CRT faceplate thereby breaking the faceplate if such forces are in excess of the strength of the faceplate. A further problem is the clamp means takes up room that could better ~e utilized to space components or to position more components therein.
U.S. Patent Nos. 3,268,659 which issued to C.B. Gibson on 23 August 1966; 3,281,618 which issued to L.E. Swedlund on 25 October 1966; 3,361,270 which issued to L.E. Swedlund on 2 January 1968 and 3,683,225 which ... .. . .
- ' ' ' ' - '-~`` 1092S73 issued to M.~. Butler on 8 August 1972 disclose lighting means for lighting internal graticule scale lines of a cathode ray tube. These lighting means are constructed in such a manner and mounted along or around the faceplate that it is very difficult to replace light bulbs, because, in some instruments, the light bulbs are soldered in position, and, in other instruments, it required removing the light guide member which has light bulbs secured therein. The arrangements make it difficult, time consuming and expensive to replace light bulbs.
SUMMARY OF THE PRESENT INVENTION
The present invention is directed to a mounting means and lighting means and more particularly to a cathode ray tube mounting means and lighting means for illuminating the graticule scale lines of a cathode ray tube.
The present invention is realized by the cathode ray tube having wedge-shaped projection means provided on the funnel section which mate with wedging members that are movably mounted in the wall delimiting the opening of the panel member through which the cathode ray tube is passed.
A bezel member having an implosion shield means therein i~
secured onto the panel member with the implosion shield means in engagement with the faceplate of the cathode ray tube. Means connected to the wedging members and for moving the wedging members into tight engagement with the wedge-shaped projection means thereby forcing the cathode ray tube faceplate ~in tight engagement with the implosion shield means. A light bar is positioned between the panel member and the bezel member and is disposed adjacent an edge of the faceplate. A circuit board has light bulbs removably secured thereto and the circuit board is secured to the light bar through the bezel member and the light bulbs are disposed in respective openings in the light bar so that the light bulbs and light bar can illuminate the graticule scale of the cathode ray tube.
An object of the present invention is to provide a - cathode ray tube mounting means.
Another object of the present invention is the provision of cathode ray tube mounting means wherein the cathode ray tube is mounted at its front end only.
A further object of the present invention is to provide a cathode ray tube mounting means that properly aligns the cathode ray tube faceplate with the bezel means so that accurate information can be photographed thereof.
An additional object of the present invention is the provision of a cathode ray tube mounting means that enables the cathode ray tube to be readily mounted securely in position and to properly align the faceplate of the cathode ray tube with bezel means.
A still further object of the present invention is to provide a graticule lighting means for illuminating the internal graticule scale of the cathode ray tube.
Still an additional object of the p~esent invention is the provision of a graticule lighting means having light bulb means that are easily replaceable.
In accordance with an aspect of the invention there is provided lighting-means for illuminating internal graticule lines on a surface of a cathode ray tube faceplate comprising:
front casting means including mounting means for removably mounting a cathode ray tube thereon; bezel means surrounding the cathode ray tube faceplate and being mounted on said front casting means; light guide means extending along an edge of the faceplate and having spaced openings therein;
means securing said light guide means onto said bezel means and including holes therethrough and through said bezel means in alignment with said spaced openings respectively; light bulb means disposed in said holes and spaced openings; con-ductive means provided on said securing means electrically engaging respective terminals of said light bulb means; and means connected to said conductive means for providing elec-. trical potential thereto to energize said light bulb means.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention taken in conjunction with the invention disclosed in Canadian patent application Serial No.
289,068 which was filed on 19 October 1977, will be described in detail hereinbelow with the aid of the accompanying -drawings, in which~
Figure 1 is a perspective exploded view showing the cathode ray tube mounting arrangement;
Figùre 2 is a perspective view showing the wedge-shaped projections on the funnel section of the cathode ray tube and the wedging members matable therewith;
Figure 3 is a side elevational view showing the cathode ray tube in a mounted position;
Figure 4 is a perspective exploded view showing the : .. - - ~-, . . . .. . .... . . :
- ~ .~ '' : '`
lighting means and camera-connecting means;
Figure 5 is a part ccoss-sectional view taken along lines 5-5 of Figure 4; and Figure S is a part cross-sectional view taken along lines 6-6 of Figure 4.
DETAILED DESCRI PTION OF THE INVENTION
Turning now to Figures 1-3, a cathode ray tube 10 is preferably of the type disclosed in U.S. Patent No.
3,207,936, which issued to W.H. Wilbanks, et al on 21 September 1965 but it can be any type of tube that will operate as required. Tube 10 has a ceramic funnel section 12 to the front end of which is frit sealed via frit 13 (Fig. 4) a flat faceplate 14 which is made of a suitable glass. A conventional graticule scale 16 as shown in Figure 5 is generally in the form of intersecting lines of glass frit fused to the inner surface of - 4a -faceplate 14 but they can be formed of light reflecting and diffusing material such as titanium dioxide deposited on the inside surface of the faceplate or by grooves that are etched or scribed into such rear surface as disclosed in U.S. Patent Nos. 3,683,225; 3,361,270; 3,281,618 and 3,268,659 previously identified. A conventional phosphor layer 1 is deposited or coated over graticule scale 16 along the inner surface of faceplate 14 and it may function as a conventional phosphor screen, or it may also operate as a storage dielectric of a direct-viewing bistable storage tube of the type disclosed in U.S. Patent No.
3,214,631 which issued to Robert H. Anderson on 26 October lq65 in which case a thin light transparent conductive layer of tin oxide (not shown) is provided beneath the phosphor layer. Of course, even when phosphor layer 18 functions as a storage dielectric, it can also operate as a conventional phosphor viewing screen for emitting a light image of the charge image stored on such dielectric.
Funnel section 12 has wedge-shaped projections 20 20 thereon and these projections can be formed as part of funnel section 12 or they can be secured onto funnel section 12 by use of a suitable adhering material such as for example an epoxy resin. The funnel section can be made from glass if desired. Projections 20 are located adjacent the front end of the funnel section so that a faceplate 14 is also fr~t sealed to projections 20 as well as the front edge of the funnel section.
Front casting 22 has an opening through which the ~athode ray tube 10 is introduced into the cabinet. U-3C shaped guides 24 are provided by opposing inside surfacesdelimiting the opening in casting 22. The inside surface of guides 24 conform to the exterior surface of wedging members 26 which are slidably mounted therein. Radiussed projection 28 is provided by wedging members 26 which have a screw 30 -5a-109~573 threadably di~posed therein. The inside surface of wedging members 26 has a wedge shape for matable engagement with respective projections 20. Wedging members 26 are preferably molded from a suitable plastic material such as for example plastic material marketed under the trademark DELRIN.
A bezel 32 has a transparent implosion shield 34 therein and bezel 32 is secured onto casting 22 via screws 36. After bezel 32 has been secured onto casting 22, screws 30 are tightened through openings 38 in bezel 32 in align-ment with screws 30 thereby causing wedging members 26 tomove along guide members 24 and along projections 20 whereby faceplate 14 is moved into tight engagement with implosion shield 34 through the action of wedging members 26 on pro-jections 20. The cathode ray tube is now tightly and securely mounted in position on casting 22 at the front end of the cathode ray tube. Such action places the faceplate parallel with the bezel so that proper alignment takes place and photographs taken of information displayed on the screen will be accurate. Casting 22 is secured to corner mounting members of the type disclosed in U.S. Patent 4,123,129 which issued to M. D. Butler on 31 October 1978 which forms a frame that will result in an electronic cabinet for housing a cathode ray tube and associated electronic circuitry. If the cathode ray tube needs to be replaced, it can readily be done by removing the bezel and loosening screws 30. The plastic wedging members 26 serve as shock abosorbers if the instrument is subjected to an undue shock.
Turning now to Figures 4-6, a graticule lighting means is illustrated. A light guide 40 is preferably molded from a suitable plastic material such as methyl methacrylate and it includes projections 42 that mate with holes 44 in bezel 32. Holes 46 extend through projections 42 and light .
guide 40. Projections 48 extend outwardly from both sides of light guide 40 and mate with holes 50 and 52 in bezel 32 and casting 22 respectively; whereas projections 54 mate with holes 56 in bezel 32. A white tape 58 is adhered onto the bottom of light guide 40 and a white tape (not shown) is adhered onto the sides and top of faceplate 14.
A printed circuit board 60 has a circuit path 62 located on an outer surface which surrounds openings 64 and which make electrical contact with an outer terminal of 10 light bulbs 66. Another circuit path 68 (Figure 5) is provided on the inner surface of circuit board 60, and it is connected to contact members 70 which are pivotally mounted on the circuit board to enable light bulbs 66 to be inserted into openings 64 when they are in the position shown in Figure 4 and they are then moved into engagement with the inner terminals of light bulbs 66 as shown in Figure 5 to provide electrical contact thereto and to maintain light bulbs 66 in position. Circuit paths 62 and 68 are connected .
respectively to electrical terminal pins 72 and 74.
In assembly and before bezel 32 is secured onto front casting 22, ligh$ guide 40 is positioned on a bottom inner surface of bezel 32 with projections 42, 48 and 54 - extending through holes 44, 50 and 56, respectively. A thin strip of insulating material 76 having holes therethrough that mate with holes 44, 50 and 56 is positioned onto the bottom outer surface of bezel 32 whereafter circuit board 60 is positioned-in engagement with insulating strip 76 with terminal posts 72 and 74 extending through holes in pro-jections 48. Screws 78 are then passed through holes 80 in circuit board 60 and threadably engage holes in projections 54 thereby securing light guide 40 and circuit board 60 in position on the bottom inner and outer surfaces respectively ,: - , , , of bezel 32. Bezel 32 with implosion shield 34 in position therein can now be secured to front casting 22 via screws 36 with projections 48 extending through holes 52 in front casting 22. Screws 30 are then tightened through holes 38 thereby securing the cathode ray tube in position against the implosion shield via wedging members 26 and projections 20 as described hereinbefore.
Arcuate depressions 40a are provided in the upper edges of light guide 40 in alignment with holes 46 to restrict the area where the light is transmitted from light guide 40 into the faceplate to illuminate the internal graticule 16 in order to eliminate light spots that would be created by the filaments of light bulbs 66.
A cover 82, which is preferably molded from a suitable plastic material, is provided with integral spring latches 84 which mate with oblong openings 86 in bezel 32 thereby latchably maintaining cover 82 in position. A
filter (not shown) can be postioned in cover 82 and held in position against bezel 32 by cover 82 to filter out any undesired light. Cover 82 can be removed and this permits ready replacement of burned out bulbs 66.
An electrical connector assembly 86 including an insulating housing and electrical receptacles therein is connected to terminal pins 72 and 74 to provide electrical potential to light bulbs 66.
A camera-connecting means can also beprovided as ~ -shown in Figures 4 and 6. An insulating contact carrier 88 is molded from a suitable dielectric material with pins 90 in position therein at spaced intervals. Annular projections 3Q 92 surrounding part of pins 90 are provided by carrier 88 and they mate with holes 94 located in the middle of the left side of front casting 22 so that projections 92 insulate " - , - - - , , . ~ ,............................. .
-- ' ' ' :
pins 90 from casting 22 and carrier 88 abuts thereagainst.
A flange 96 is provided on the top, bottom and inner side of carrier 88 and it abuts against bezel 32 which permits the front section of carrier 88 to extend through rectangular opening 98 in the middle of the left side of bezel 32.
Bezel 32 maintains carrier 88 in position when it is secured onto casting~22. Pins 90 have right-angled contact sections 100 that extend along the top surface of carrier 88 to provide electrical power to an oscilloscope camera (not shown) of the type disclosed in U.S. Patent No. 3,149,903 which issued to M. J. Merrick on 22 September 1964 which is mounted in position on bezel 32 via grooves 102 and 104. An electrical connector assembly 106 similar to connector assembly 86 makes electrical connection with pins 90 to provide electrical potential thereto.
Electrical connector assemblies 86 and 106 can be of the type disclosed in U.S. Patent No. Re 28,147 which issued to E. P. Hoffman on 3 September 1974.
As can be discerned from the foregoing, there has been disclosed a cathode ray tube mounting arrangement that enables easy and accurate mounting of a cathode ray tube in position in an electronic cabinet so that the cathode ray tube is properly aligned and to enable fast an easy replace-ment of the CRT when necessary. Also disclosed is a graticule lighting arrangement that enables the elements of the graticule lighting arrangement to be easily and readily mounted in position and to permit easy replacement of burned out light bulbs~
It will be obvious to those knowledgeable of the particular art to which this invention pertains that many _g_ .
.
~ , - .
.
changes may be made in details of the above-described embodi-ments of the present invention without departing from the spirit thereof. Therefore, the scope of the present invention is to be determined by the following claims.
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.. ... . . .
Claims (4)
1. Lighting means for illuminating internal graticule lines on a surface of a cathode ray tube faceplate comprising:
front casting means including mounting means for removably mounting a cathode ray tube thereon;
bezel means surrounding the cathode ray tube faceplate and being mounted on said front casting means;
light guide means extending along an edge of the faceplate and having spaced openings therein;
means securing said light guide means onto said bezel means and including holes therethrough and through said bezel means in alignment with said spaced openings respectively;
light bulb means disposed in said holes and spaced openings;
conductive means provided on said securing means electrically engaging respective terminals of said light bulb means; and means connected to said conductive means for providing electrical potential thereto to energize said light bulb means.
front casting means including mounting means for removably mounting a cathode ray tube thereon;
bezel means surrounding the cathode ray tube faceplate and being mounted on said front casting means;
light guide means extending along an edge of the faceplate and having spaced openings therein;
means securing said light guide means onto said bezel means and including holes therethrough and through said bezel means in alignment with said spaced openings respectively;
light bulb means disposed in said holes and spaced openings;
conductive means provided on said securing means electrically engaging respective terminals of said light bulb means; and means connected to said conductive means for providing electrical potential thereto to energize said light bulb means.
2. Light means according to claim 1 whereas said conductive means includes contact means pivotally mounted on said securing means for electrical engagement with inner terminals of said light bulb means to maintain said light bulb means in position in said spaced openings and to maintain outer terminals of said light bulb means in electrical engagement with conductive path means provided by said securing means, said pivotal contact means permitting easy replacement of said light bulb means.
3. Lighting means according to claim 1 wherein arcuate-shaped depressions are provided in upper edges of said light guide means in alignment with said spaced openings to restrict the area through which the light from said light bulb means is transmitted into the faceplate.
4. Lighting means according to claim 1 wherein reflective means is disposed along a bottom surface of said light guide means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA346,400A CA1092573A (en) | 1976-11-18 | 1980-02-25 | Cathode ray tube mounting means including lighting means and camera-connecting means |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US743,017 | 1976-11-18 | ||
| US05/743,017 US4063289A (en) | 1976-11-18 | 1976-11-18 | Cathode ray tube mounting means including lighting means and camera-connecting means |
| CA289,068A CA1087719A (en) | 1976-11-18 | 1977-10-19 | Cathode ray tube mounting means including lighting means and camera-connecting means |
| CA346,400A CA1092573A (en) | 1976-11-18 | 1980-02-25 | Cathode ray tube mounting means including lighting means and camera-connecting means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1092573A true CA1092573A (en) | 1980-12-30 |
Family
ID=27165328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA346,400A Expired CA1092573A (en) | 1976-11-18 | 1980-02-25 | Cathode ray tube mounting means including lighting means and camera-connecting means |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1092573A (en) |
-
1980
- 1980-02-25 CA CA346,400A patent/CA1092573A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |