CA1119235A - Tubular incandescent lamp - Google Patents
Tubular incandescent lampInfo
- Publication number
- CA1119235A CA1119235A CA000334014A CA334014A CA1119235A CA 1119235 A CA1119235 A CA 1119235A CA 000334014 A CA000334014 A CA 000334014A CA 334014 A CA334014 A CA 334014A CA 1119235 A CA1119235 A CA 1119235A
- Authority
- CA
- Canada
- Prior art keywords
- light
- incandescent lamp
- light emitting
- tubular incandescent
- circuit part
- 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.)
- Expired
Links
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 230000000630 rising effect Effects 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008093 supporting effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000007514 turning Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/18—Mountings or supports for the incandescent body
- H01K1/24—Mounts for lamps with connections at opposite ends, e.g. for tubular lamp
Landscapes
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Resistance Heating (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a long, tubular incandescent lamp which has incorporated therein a filament formed by coupling light emitting segments and non-light-emitting segments alternately with each other, each of the light emitting segments is composed of a light emitting coil and a coil-like coupling member of a larger pitch than the light emitting coil, and each of the non-light-emitting segments is composed of a bar formed to have a straight short-circuit part, bent portions at both ends thereof and supports respectively extending from the bent portions. The short-circuit part is inserted into the coil-like coupling member and they are welded to each other to obtain the filament composed of the light emitting and the non-light-emitting segments coupled alternately with each other. The filament is sealed in the long, tubular bulb; thus, a simple-structured and highly shock resistant incandescent lamp can easily be obtained.
In a long, tubular incandescent lamp which has incorporated therein a filament formed by coupling light emitting segments and non-light-emitting segments alternately with each other, each of the light emitting segments is composed of a light emitting coil and a coil-like coupling member of a larger pitch than the light emitting coil, and each of the non-light-emitting segments is composed of a bar formed to have a straight short-circuit part, bent portions at both ends thereof and supports respectively extending from the bent portions. The short-circuit part is inserted into the coil-like coupling member and they are welded to each other to obtain the filament composed of the light emitting and the non-light-emitting segments coupled alternately with each other. The filament is sealed in the long, tubular bulb; thus, a simple-structured and highly shock resistant incandescent lamp can easily be obtained.
Description
1119~35 This invention relates to a tubular incandescent lamp, and more particularl~ to a long tubular incandescent lamp for use in electronic copying machines which has incorporated therein a filament having non-light-emitting parts.
Many studies and inventions have been made on a long, tubular incandescent lamp for use in electronic copying machines which has incor-porated therein a filament having light emitting and non-light-emitting segments.
Recent trends in electronic copying machines employing a lamp of this kind are speeding up operation and reducing power dissipation, and to meet the requirements, a very high degree of performance is now required for the lamp used in such copying machines.
For speeding up the operation, the lamp scanning speed must be raised; therefore, it is necessary to enhance the shock resistance of the lamp, but it is also important how the filament weight be reduced as well as what structure be adopted for the lamp.
For the reduction of power dissipation, the lamp is designed to decrease its power consumption, and use is made of a sensitizer of high sensitivity, so that changes in the distribution and quantity of light of the lamp are liable to affect the copying operation; consequently, it is required to control the distribution of light with high precision and to reduce an allowance error for the change in the quantity of light.
To fulfil such requirements imposed on the tubular incandescent lamp for use in the electronic copying machine, many studies are now being done for an optimum design of the lamp.
Con~entional tubular incandescent lamps are roughly di~ided into the following types:
~a) A segment type in which light emitting and non-light-f -- 1 ---, ~
~g23s emitting segments are connected alternately with each other (United States Patent No. 3,416,024 of W. D. Young, issued Dec. 10, 1968).
(~) A short bar type in which a continuous coil filament is short-circuited by short bars at predetermined positions (Japanese Utility Model Publication Gazette No. 359/70).
~ c) A skipped winding type in which a continuous coil fila-ment is made roughly-pitched at predetermined positions to provide portions which are inhibited to light ~United States Patent No. 3,295,007 of W. D.
Young, issued Dec. 27, 1966).
Cd) A type combining the abovesaid features (a) to (c). All these conventional lamps have both merits and demerits, and studies for improvement are now made extensively so as to keep abreast of progress in the present electronic copying machine.
This invention is directed to the abovesaid segment type tub-ular incandescent lamp and is to provide a novel tubular incandescent lamp which is lightweight, excellent in shock resistance and substantially free from changes in the distribution and quantity of light.
Briefly stated, in the long, tubular incandescent lamp of this invention in which there is incorporated a filament formed by connecting light emitting and non-light-emitting segments alternately with each other, the light emitting segments are each composed of a light emitting coil and a coil-like coupling member of a pitch larger than thàt of the light emitting coil, the non-light-emitting segments are each formed with a bar and have a straight short-circuit part, bent portions at both ends thereof and supports respectively extending from the bent portions, and the short-circuit part is inserted into the coupling member and welded thereto.
The invention will now be further described in conjunction with
Many studies and inventions have been made on a long, tubular incandescent lamp for use in electronic copying machines which has incor-porated therein a filament having light emitting and non-light-emitting segments.
Recent trends in electronic copying machines employing a lamp of this kind are speeding up operation and reducing power dissipation, and to meet the requirements, a very high degree of performance is now required for the lamp used in such copying machines.
For speeding up the operation, the lamp scanning speed must be raised; therefore, it is necessary to enhance the shock resistance of the lamp, but it is also important how the filament weight be reduced as well as what structure be adopted for the lamp.
For the reduction of power dissipation, the lamp is designed to decrease its power consumption, and use is made of a sensitizer of high sensitivity, so that changes in the distribution and quantity of light of the lamp are liable to affect the copying operation; consequently, it is required to control the distribution of light with high precision and to reduce an allowance error for the change in the quantity of light.
To fulfil such requirements imposed on the tubular incandescent lamp for use in the electronic copying machine, many studies are now being done for an optimum design of the lamp.
Con~entional tubular incandescent lamps are roughly di~ided into the following types:
~a) A segment type in which light emitting and non-light-f -- 1 ---, ~
~g23s emitting segments are connected alternately with each other (United States Patent No. 3,416,024 of W. D. Young, issued Dec. 10, 1968).
(~) A short bar type in which a continuous coil filament is short-circuited by short bars at predetermined positions (Japanese Utility Model Publication Gazette No. 359/70).
~ c) A skipped winding type in which a continuous coil fila-ment is made roughly-pitched at predetermined positions to provide portions which are inhibited to light ~United States Patent No. 3,295,007 of W. D.
Young, issued Dec. 27, 1966).
Cd) A type combining the abovesaid features (a) to (c). All these conventional lamps have both merits and demerits, and studies for improvement are now made extensively so as to keep abreast of progress in the present electronic copying machine.
This invention is directed to the abovesaid segment type tub-ular incandescent lamp and is to provide a novel tubular incandescent lamp which is lightweight, excellent in shock resistance and substantially free from changes in the distribution and quantity of light.
Briefly stated, in the long, tubular incandescent lamp of this invention in which there is incorporated a filament formed by connecting light emitting and non-light-emitting segments alternately with each other, the light emitting segments are each composed of a light emitting coil and a coil-like coupling member of a pitch larger than thàt of the light emitting coil, the non-light-emitting segments are each formed with a bar and have a straight short-circuit part, bent portions at both ends thereof and supports respectively extending from the bent portions, and the short-circuit part is inserted into the coupling member and welded thereto.
The invention will now be further described in conjunction with
- 2 -~ ~:
l~lgZ35 the accompanying drawings, in whîch:
Figur0 lCa~ illustrates the principal part of a tubular incan-descent lamp of this invention;
Figure l(b) illustrates a light emitting segment used in Figure l(a);
Figure lCc) illustrates a non-light-emitting segment used in Figure l(a);
Figure 2 is a diagram useful in explaining a method for assem-bling of the light emitting and non-light-emitting segments;
Figure 3 is an enlarged diagram showing assembling of the light emitting and non-light-emitting segments;
Figure 4 illustrates a press formed piece;
Figure 5 shows a support of the non-light-emitting segment;
Figure 6(a) shows the principal part of another embodiment of this invention;
Figure 6Cb) illustrates a light emitting segment utilized in Figure 6~a);
Figure 6(c2 illustrates a non-light-emitting segment employed in Figure 6(a);
Figure 7 is a diagram useful in explaining a method for assem-bling of the light emitting and non-light-emitting segments in the embod-iment of Figure 6~a);
Figure 8 is an enlarged diagram showing assembling of light emitting and non-light-emitting segments in accordance with still another embodiment of this invention; and Figure 9 shows a modified form of the non-light-emitting segment.
In Figure 1 ~comprising Figures lA - lC), reference numeral 1 indicates a quartz bulb; 2 designates light emitting segments, each .
.
`' compQsed of a light emitting coil 2a and a roughly-pitched coil-like coupling member 2b; 3 identifies non-light-emitting segments, each of which is formed with a bar and composed of a straight short-circui~ part 3a, bent portions 3b (see Figure 2) provided at its two ends and ring-shaped supports 3c respectively extending from the bent portions 3b~ As shown iTI Figure 2, the light emitting segments 2 and the non-light-emitting segments 3 are assembled together by guiding the coupling member 2c of each light emitting segment 2 across the bent portion 3b of each non-light-emitting segment 3 in the direction indicated by 4 while turn-ing the segment 2, just like a screw, to entwine around the short-circuit part 3a of the segment 3. Then, the coupling member 2b is fixed by weld-ing to the short-circuit part 3a at a predetermined position. The light emitting segments 2 and the non-light-emitting segments 3 are thus inter-connected alternately with each other to provide a filament, which is disposed in the bulb 1.
Since the light emitting segment 2 is guided across the bent portion 3b while being turned, it is preferred that the pitch of the coupling member 2b be large, in particular larger than the diameter of the bar. This permits easy assembling of the segments 2 and 3 and serves to prevent deformation of the light emitting segment because any unnec-essary force is not applied thereto; further, coupled with ease in fabri-cation of the light emitting segments 2 and the non-light-emitting seg-ments 3 of accurate configurations, a filament of accurate configuration can easily be obtained.
The non-light-emitting segment 3 has formed integrally there-with the supports 3C, and a bar diameter of about 0.2 to 0.6 mm is sufficient to support the filament along the axis of the bulb 1 and en-ables the short-ci~cuit part 3a to function as a non-light-emitting part lli~235 sufficiently. ~n this manner~ the non-light-emitting segment 3 is formed with a bar but has the non-light-emitting function and the bulb support-ing function; in addition, it is made lightweight using a minimum member of components and is easy to assemble with the light emitting segment.
The above is the basic arrangement of the tubular incandescent lamp of this invention, but the following tactics will provide for enhanced performance.
Figure 3 shows, on an enlarged scale, assembling of the light emitting segment 2 and the non-light-emitting segment 3. When the diameter of the bar is about 0.2 to 0.6 mm, the inner side surface P of the bent portion 3b usually has a curvature with a radius of about 0.3 to 1.0 mm. Due to this curvature, that part 2'a of the coupling member 2b which extends around the bent portion 3b slides up thereon obliquely to the right or left, resulting in the center line Y-Y of the light emitting coil 2a being deviated from the center line X-X of the straight short-circuit part 3a, though slightly.
~here higher performance is required the abovesaid deviation, though slight, may in some cases have an affect on the non-light-emitting segment. The short-circuit part 3a may therefore be formed to deviate from the center line of the support 3c in a direction reverse to that in which the coupling member 2b slides up, thereby ensuring that when a filament is disposed in the bulb, the light emitting coil 2a lies in alignment with the bulb axis, although the short-circuit part 3a deviates therefrom.
Also, it is possible to press the base of the inner side sur-face of the bent portion 3b using a sharp tool so as to remove the round-ness of the base of the inner side surface.
Further, segment type tubular incandescent lamps have a problem ~1192~5 in terms Qf p~oduction control in that a number of fine parts are con-trolled. In t~e present invention, however, the support 3c of the non-light-emitting segment 3 is formed to loop with one turn and, as shown in Figure 5, the spacing t between the beginning and terminating points Ql and Q2 of the support 3c is selected to be smaller than the diameter.d of the bar. This prevents the segments or filaments being entangled by the non-light-emitting segment 3; consequently, non-light-emitting seg-ments and filaments become easy to handle and they are not deformed by such entanglement, so that a tubular incandescent lamp of excellent per-formance can be obtained. When the support 3c is formed double to loop with more than one turn, its bulb supporting ability increases, but since the diameter of the bar is relatively large, a substantial amount of light is intercepted, exerting a bad influence on the distribution of light and the intensity of light. In the case of the diameter of the bar being in the range of about 0.2 to 0.6mm, if the support 3c is formed to loop with one turn, it sufficiently fulfils the bar supporting function. On top of that, in the case where the entire filament can be designed to be lightweight as is the case with the tubular incandescent la~p of this inventîon, it is rather practical to form the support 3c with one turn and select the aforesaid spacing t in consideration of the diameter d of the bar.
Turning next to Figure 6 Ccomprising Figures 6A - 6C) and Figure 7, another embodiment of this invention will be described. In Figures 6 and 7, parts corresponding to those mentioned above are marked with the same reference numerals, and no description will be repeated.
Figure 6(a) is a longitudinal sectional view showing the principal part of the tubular incandescent lamp of this embodiment;
Figures 6~b) and 6(c~ respectively show light emitting segments and non-.
," .
light-emitting segments employed in this embodiment; and Figure 7 is useful in explaining assembling of the light emitting segments and the non-light-emitting segments into a filament.
This embodiment differs from the foregoing embodiment in that each coupling member 2b includes, at a predetermined position, a sharply rising portion of about one turn or a closely-pitched coil-like portion.
With the provision of such a sharply rising portion, in the assembling of the filament the coupling member does not easily pass across the bent portion 3b of each non-light-emitting segment 3 at the position of the sharply rising portion. Once the filament has been assembled, the sharply rising portion positioned immediately before or after the bent portion 3b prevents easy displacement of the light emitting segment 2 and the non-light-emitting 3 relative to each other; consequently, the aforementioned welding may be omitted in some cases. Further, the sharp-ly rising portion can be used for indicating the positional relationship between the segments 2 and 3 during assembling and allows ease in obtain-ing the short-circuit distance with accuracy. With the sharply rising portion of one turn or so, the light emitting segment is hardly deformed;
even if it is deformed, this can be settled by slightly bending the two end portions of the short-circuit part 3a to deviate in a direction opposite to that of extension of the bent portion 3b (as viewed in Figure 6) in anticipation of a slight deviation of the light emitting coil 2a in the direction of extension of the bent portion 3b ~as viewed in Figure 6).
This slight deviation is about less than 0.3 mm and sometimes negligible.
Referring now to Figures 8 and 9, still another embodiment of this invention will be described.
Figure 8 shows, on an enlarged scale, assembling of the light emitting segment 2 and the non-light-emitting segment 3. When an angle 0 between the bent portion 3b and the straight short-circuit part 3a of the non-light-emitting segment 3 is larger than 90, the inner side surface P of the bent portion 3b usually has a curvature with a radius of about 0.3 to 1.0 mm in the case of the bar having a diameter of approximately 0.2 to 0.6 mm. Due to this curvature, that part 2~a of the coupling mem-ber 2b which extends around the bent portion 3b slides up thereon obliquely to the right or left, resulting in the center line Y-Y of the light emitting coil 2a being deviated from the center line X-X of the straight short-circuit part 3a, though slightly.
Where higher performance is required, the abovesaid deviation, though slight, may in some cases affect the performance. To avoid thisJ
in the making of the non-light-emitting segment, the bent portion 3b is slightly inclined towards the straight short-circuit part 3a so that the angle 0 between the bent portion 3b and the straight short-circuit part 3a is made a little sharp, for example, about 80. This easily serves to prevent the abovesaid "sliding up".
In this case, the curvature of the inner side surface P of the bent portion 3b is also reduced; accordingly, a tubular incandescent lamp of higher performance is available.
As has been described in the foregoing, the tubular incandescent lamp of this invention is lightweight, has excellent shock resistance and is easy to assemble with accuracy; therefore, the lamp of this invention is substantially free from changes in the distribution and quantity of light.
It will be apparent that many modifications and variations may be effected without departing from the scope of the novel concepts of this invention.
` .
l~lgZ35 the accompanying drawings, in whîch:
Figur0 lCa~ illustrates the principal part of a tubular incan-descent lamp of this invention;
Figure l(b) illustrates a light emitting segment used in Figure l(a);
Figure lCc) illustrates a non-light-emitting segment used in Figure l(a);
Figure 2 is a diagram useful in explaining a method for assem-bling of the light emitting and non-light-emitting segments;
Figure 3 is an enlarged diagram showing assembling of the light emitting and non-light-emitting segments;
Figure 4 illustrates a press formed piece;
Figure 5 shows a support of the non-light-emitting segment;
Figure 6(a) shows the principal part of another embodiment of this invention;
Figure 6Cb) illustrates a light emitting segment utilized in Figure 6~a);
Figure 6(c2 illustrates a non-light-emitting segment employed in Figure 6(a);
Figure 7 is a diagram useful in explaining a method for assem-bling of the light emitting and non-light-emitting segments in the embod-iment of Figure 6~a);
Figure 8 is an enlarged diagram showing assembling of light emitting and non-light-emitting segments in accordance with still another embodiment of this invention; and Figure 9 shows a modified form of the non-light-emitting segment.
In Figure 1 ~comprising Figures lA - lC), reference numeral 1 indicates a quartz bulb; 2 designates light emitting segments, each .
.
`' compQsed of a light emitting coil 2a and a roughly-pitched coil-like coupling member 2b; 3 identifies non-light-emitting segments, each of which is formed with a bar and composed of a straight short-circui~ part 3a, bent portions 3b (see Figure 2) provided at its two ends and ring-shaped supports 3c respectively extending from the bent portions 3b~ As shown iTI Figure 2, the light emitting segments 2 and the non-light-emitting segments 3 are assembled together by guiding the coupling member 2c of each light emitting segment 2 across the bent portion 3b of each non-light-emitting segment 3 in the direction indicated by 4 while turn-ing the segment 2, just like a screw, to entwine around the short-circuit part 3a of the segment 3. Then, the coupling member 2b is fixed by weld-ing to the short-circuit part 3a at a predetermined position. The light emitting segments 2 and the non-light-emitting segments 3 are thus inter-connected alternately with each other to provide a filament, which is disposed in the bulb 1.
Since the light emitting segment 2 is guided across the bent portion 3b while being turned, it is preferred that the pitch of the coupling member 2b be large, in particular larger than the diameter of the bar. This permits easy assembling of the segments 2 and 3 and serves to prevent deformation of the light emitting segment because any unnec-essary force is not applied thereto; further, coupled with ease in fabri-cation of the light emitting segments 2 and the non-light-emitting seg-ments 3 of accurate configurations, a filament of accurate configuration can easily be obtained.
The non-light-emitting segment 3 has formed integrally there-with the supports 3C, and a bar diameter of about 0.2 to 0.6 mm is sufficient to support the filament along the axis of the bulb 1 and en-ables the short-ci~cuit part 3a to function as a non-light-emitting part lli~235 sufficiently. ~n this manner~ the non-light-emitting segment 3 is formed with a bar but has the non-light-emitting function and the bulb support-ing function; in addition, it is made lightweight using a minimum member of components and is easy to assemble with the light emitting segment.
The above is the basic arrangement of the tubular incandescent lamp of this invention, but the following tactics will provide for enhanced performance.
Figure 3 shows, on an enlarged scale, assembling of the light emitting segment 2 and the non-light-emitting segment 3. When the diameter of the bar is about 0.2 to 0.6 mm, the inner side surface P of the bent portion 3b usually has a curvature with a radius of about 0.3 to 1.0 mm. Due to this curvature, that part 2'a of the coupling member 2b which extends around the bent portion 3b slides up thereon obliquely to the right or left, resulting in the center line Y-Y of the light emitting coil 2a being deviated from the center line X-X of the straight short-circuit part 3a, though slightly.
~here higher performance is required the abovesaid deviation, though slight, may in some cases have an affect on the non-light-emitting segment. The short-circuit part 3a may therefore be formed to deviate from the center line of the support 3c in a direction reverse to that in which the coupling member 2b slides up, thereby ensuring that when a filament is disposed in the bulb, the light emitting coil 2a lies in alignment with the bulb axis, although the short-circuit part 3a deviates therefrom.
Also, it is possible to press the base of the inner side sur-face of the bent portion 3b using a sharp tool so as to remove the round-ness of the base of the inner side surface.
Further, segment type tubular incandescent lamps have a problem ~1192~5 in terms Qf p~oduction control in that a number of fine parts are con-trolled. In t~e present invention, however, the support 3c of the non-light-emitting segment 3 is formed to loop with one turn and, as shown in Figure 5, the spacing t between the beginning and terminating points Ql and Q2 of the support 3c is selected to be smaller than the diameter.d of the bar. This prevents the segments or filaments being entangled by the non-light-emitting segment 3; consequently, non-light-emitting seg-ments and filaments become easy to handle and they are not deformed by such entanglement, so that a tubular incandescent lamp of excellent per-formance can be obtained. When the support 3c is formed double to loop with more than one turn, its bulb supporting ability increases, but since the diameter of the bar is relatively large, a substantial amount of light is intercepted, exerting a bad influence on the distribution of light and the intensity of light. In the case of the diameter of the bar being in the range of about 0.2 to 0.6mm, if the support 3c is formed to loop with one turn, it sufficiently fulfils the bar supporting function. On top of that, in the case where the entire filament can be designed to be lightweight as is the case with the tubular incandescent la~p of this inventîon, it is rather practical to form the support 3c with one turn and select the aforesaid spacing t in consideration of the diameter d of the bar.
Turning next to Figure 6 Ccomprising Figures 6A - 6C) and Figure 7, another embodiment of this invention will be described. In Figures 6 and 7, parts corresponding to those mentioned above are marked with the same reference numerals, and no description will be repeated.
Figure 6(a) is a longitudinal sectional view showing the principal part of the tubular incandescent lamp of this embodiment;
Figures 6~b) and 6(c~ respectively show light emitting segments and non-.
," .
light-emitting segments employed in this embodiment; and Figure 7 is useful in explaining assembling of the light emitting segments and the non-light-emitting segments into a filament.
This embodiment differs from the foregoing embodiment in that each coupling member 2b includes, at a predetermined position, a sharply rising portion of about one turn or a closely-pitched coil-like portion.
With the provision of such a sharply rising portion, in the assembling of the filament the coupling member does not easily pass across the bent portion 3b of each non-light-emitting segment 3 at the position of the sharply rising portion. Once the filament has been assembled, the sharply rising portion positioned immediately before or after the bent portion 3b prevents easy displacement of the light emitting segment 2 and the non-light-emitting 3 relative to each other; consequently, the aforementioned welding may be omitted in some cases. Further, the sharp-ly rising portion can be used for indicating the positional relationship between the segments 2 and 3 during assembling and allows ease in obtain-ing the short-circuit distance with accuracy. With the sharply rising portion of one turn or so, the light emitting segment is hardly deformed;
even if it is deformed, this can be settled by slightly bending the two end portions of the short-circuit part 3a to deviate in a direction opposite to that of extension of the bent portion 3b (as viewed in Figure 6) in anticipation of a slight deviation of the light emitting coil 2a in the direction of extension of the bent portion 3b ~as viewed in Figure 6).
This slight deviation is about less than 0.3 mm and sometimes negligible.
Referring now to Figures 8 and 9, still another embodiment of this invention will be described.
Figure 8 shows, on an enlarged scale, assembling of the light emitting segment 2 and the non-light-emitting segment 3. When an angle 0 between the bent portion 3b and the straight short-circuit part 3a of the non-light-emitting segment 3 is larger than 90, the inner side surface P of the bent portion 3b usually has a curvature with a radius of about 0.3 to 1.0 mm in the case of the bar having a diameter of approximately 0.2 to 0.6 mm. Due to this curvature, that part 2~a of the coupling mem-ber 2b which extends around the bent portion 3b slides up thereon obliquely to the right or left, resulting in the center line Y-Y of the light emitting coil 2a being deviated from the center line X-X of the straight short-circuit part 3a, though slightly.
Where higher performance is required, the abovesaid deviation, though slight, may in some cases affect the performance. To avoid thisJ
in the making of the non-light-emitting segment, the bent portion 3b is slightly inclined towards the straight short-circuit part 3a so that the angle 0 between the bent portion 3b and the straight short-circuit part 3a is made a little sharp, for example, about 80. This easily serves to prevent the abovesaid "sliding up".
In this case, the curvature of the inner side surface P of the bent portion 3b is also reduced; accordingly, a tubular incandescent lamp of higher performance is available.
As has been described in the foregoing, the tubular incandescent lamp of this invention is lightweight, has excellent shock resistance and is easy to assemble with accuracy; therefore, the lamp of this invention is substantially free from changes in the distribution and quantity of light.
It will be apparent that many modifications and variations may be effected without departing from the scope of the novel concepts of this invention.
` .
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A long, tubular incandescent lamp having incorporated therein a filament composed of light emitting segments and non-light-emitting segments coupled alternately with each other, wherein each of the light emitting segments comprises a light emitting coil and a roughly-pitched coil-like coupling member;
wherein each of the non-light-emitting segments is formed with a bar having a straight short-circuit part, bent portions provided at both ends thereof and supports respectively extending from the bent por-tions; and wherein the short-circuit part is inserted into the coupling member and fixed by welding thereto.
wherein each of the non-light-emitting segments is formed with a bar having a straight short-circuit part, bent portions provided at both ends thereof and supports respectively extending from the bent por-tions; and wherein the short-circuit part is inserted into the coupling member and fixed by welding thereto.
2. A tubular incandescent lamp according to claim 1, wherein each of the bent portions is slightly inclined towards the straight short-circuit part.
3. A tubular incandescent lamp according to claim 1, wherein the straight short-circuit part is disposed to deviate from the center line of the supports.
4. A tubular incandescent lamp according to claim 1, wherein said supports have starting and terminating ends which are spaced apart a dis-tance which is smaller than the diameter of the bar.
5. A tubular incandescent lamp according to claim 1, wherein the coupling member includes at least one sharply rising portion at a pre-determined position, and wherein the sharply rising portion is engaged with each bent portion.
6. A tubular incandescent lamp according to claim 5, wherein the inner side surface of each bent portion is subjected to press forming.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16456978U JPS5748279Y2 (en) | 1978-12-01 | 1978-12-01 | |
| JP164569/1978 | 1978-12-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1119235A true CA1119235A (en) | 1982-03-02 |
Family
ID=15795650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000334014A Expired CA1119235A (en) | 1978-12-01 | 1979-08-17 | Tubular incandescent lamp |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5748279Y2 (en) |
| CA (1) | CA1119235A (en) |
| GB (1) | GB2041643B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2513115Y2 (en) * | 1989-04-24 | 1996-10-02 | シャープ株式会社 | Exposure apparatus having filter |
| US5079475A (en) * | 1989-12-01 | 1992-01-07 | U.S. Philips Corporation | Electric incandescent lamp having a looped filament support member |
| GB9807842D0 (en) | 1998-04-09 | 1998-06-10 | Gen Electric | Lamp filament |
-
1978
- 1978-12-01 JP JP16456978U patent/JPS5748279Y2/ja not_active Expired
-
1979
- 1979-06-27 GB GB7922298A patent/GB2041643B/en not_active Expired
- 1979-08-17 CA CA000334014A patent/CA1119235A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2041643A (en) | 1980-09-10 |
| JPS5748279Y2 (en) | 1982-10-22 |
| JPS5581258U (en) | 1980-06-04 |
| GB2041643B (en) | 1983-03-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |