US3634716A - Rectangularly shaped gas-filled lamp for photocopying machines - Google Patents

Rectangularly shaped gas-filled lamp for photocopying machines Download PDF

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US3634716A
US3634716A US820577A US3634716DA US3634716A US 3634716 A US3634716 A US 3634716A US 820577 A US820577 A US 820577A US 3634716D A US3634716D A US 3634716DA US 3634716 A US3634716 A US 3634716A
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main member
lamp
curved surface
sectional area
tubular
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US820577A
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Walther Von Grabe
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Ricoh Co Ltd
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Ricoh Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/32—Special longitudinal shape, e.g. for advertising purposes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/54—Lamp housings; Illuminating means
    • G03B27/542—Lamp housings; Illuminating means for copying cameras, reflex exposure lighting

Definitions

  • ABSTRACT A rectangularly shaped gas-filled lamp for photocopying machines having a main portion bent at right angles at its ends. The bent ends have a larger radius at the outer surface than at the inner surface, and the inner surface has a reduced portion to decrease the cross-sectional area and provide more brightness at the bent ends.
  • the present invention relates to a photocopying lamp and more particularly a gas-filledlamp best suited for photocopy: mg.
  • the photocopying machine must be compact in size and easy to operate so that it may be operated even in a small room. But such machine is not available at present.
  • the present invention provides a gas-filled lamp for photocopying comprising a tubular main member for utilizing substantially all of the light produced.
  • a tubular side member is formed integral with the main member by bending at least one end thereof, and a bending member is provided between the main and side members having a smaller cross-sectional area than those of the main and side members.
  • the effective length of the lamp, that is the main member is made equal to the length of the lamp effective for emitting the illumination lights to be actually used.
  • the bending member is bent to at least an angle of 90 and the inner side thereof is reduced, thereby reducing its cross-sectional area.
  • the lamp is formed rectangular in shape so that a longer side constitutes the main member for emitting the required light and the electrical connection members are attached in opposed relation with each other to the ends of the lamp symmetrical about the center of the longer side.
  • the cross-sectional area at each end of the longer side, that is the main member has a reduced cross-sectional area by providing a reduced portion extending inwardly from the inner side of the end portion of the main body.
  • the side member that isthe shorter sides of the rectangle are made as short as possible.
  • the main member, that is the longer side is coated with fluorescent or phosphor material and this coating is preferably extended beyond the main member up to the side members. Alternatively, the coating may extend substantially beyond the center of the side members.
  • the outer side of the bending member is rounded so that the outer generating line of the main member connects to that of the side member through the outer. generating line having a large radius of curvature. This provides the same effect as that attained when the main member is extended linearly beyond the bending members. By reducing the inner side of the bending member the intensity of illumination at the portions in the vicinity of the bending members can be increased.
  • the lamp according to the present invention can eliminate the defect known as vignette effect.
  • One of the objects of the present invention is to provide a photocopying machine compact in size.
  • Another object of the invention is to eliminate the variation in intensity of light in the longitudinal direction of a lamp.
  • FIG. I is a side view of one embodiment of the present invention.
  • FIG. 2 is a plan view thereof, viewed in the direction of the arrow II in FIG. 1;
  • FIG. 3 is a perspective view of one example of the arrangement thereof.
  • FIG. 4 is an explanatory view of another example of the arrangement thereof.
  • the lamp construction includes a main member 10, two side members 12 and two end members 14 coupled substantially at right angles to the side members 12 and in parallel with the main member 10.
  • These members 10, 12 and 14 form substantially rectangular shape as shown in FIG. 1.
  • the produced light is emitted from the side of the main member 10 which is coated with fluorescent material so as to produce afterglow as shown by the crosshatched portion in FIG. 1.
  • the side members 12 are positioned substantially at right angles relative to the main member 10, and at the bending portion 13 of the side member 12 a reduced portion 16 is provided.
  • the reduced portions 16 serve to cause the filamentlike current to pass more closely to the outer surface 20, that is the generating line, of the main member 10.
  • the connecting surface connecting the outer surface 20 of the main member 10 and the outer surface, generating line, of the side member 12 has a relatively larger radius of curvature as shown by a contour line 22. That is, the radius of the connecting surface 22 is larger than that surface connecting the side and end members as shown by 26 or by a broken line 24.
  • the fluorescent coating is applied up to the boundary lines 28 between the main and side members 10 and 12. This coating may be applied beyond the center of the side member 12 so that the side member also advantageously provides the light transmission.
  • electrical connection members 30 each having a fixed knurled nut for connection to a cable head of the wire.
  • the lamp having the construction described above with reference to FIGS. 1 and 2 may be utilized for example as shown in FIG. 3. That is, in this arrangement an original to be copied is placed upon a glass plate 36 and illuminated by a lamp 34. It is not necessary that outer end edges 38 of the glass plate 36 be extended beyond the outermost generating line of the side member 12. Alternatively, the edge 38 may be extended only a little beyond the side member 12.
  • the lamp 34 is mounted upon a suitable carriage (not shown) and is moved in the direction indicated by the arrow 42 in parallel with the glass plate 36. If required a plurality of lamps 34 may be mounted upon the lamp carriage in side-by-side relation. When the lamp carriage is moved, the whole surface of the original is illuminated.
  • the fluorescent coating extending beyond the boundary line 29 (shown in FIG. 3), that is substantially beyond the center of the side member 12 provides light emission as shown by the arrows 44. That is, the loss of the light emission that would be expected due to the main member not being extended is compensated by the arrangement of the lamp 34 as shown in FIG. 3 without adversely affecting the distribution and the intensity of the light.
  • the lamp 34 may be held in position by means of the connection members 30, it is not necessary to design the length of the lamp carriage longer than that of the lamp 34.
  • the bending portion 12 By providing the reduced portion 16 in the glass wall, the bending portion 12 will have a smaller cross-sectional area.
  • the reduced portion extends toward the discharge space in the main member 10 at an angle of 10 to 90, preferably 45, so that the gaseous discharge may be effected in the main member 10 at a portion closer to the light emission portion thereof.
  • FIG. 4 Another arrangement of the lamp of the present invention is shown in FIG. 4.
  • a page of an opened book, Bo which is illuminated by the lamp 34 for focus through lens L on copy sheet ba.
  • the rectangular side of the lamp 34 is positioned substantially in parallel with the glass plate 36. This arrangement can prevent the peripheral portion of an image of the page to be copied from becoming dark.
  • the lamp carriage may be made substantially equal in length to the lamp so that much space can be saved, and the photocopying machine can be made compact in size and light in weight. Furthermore, by a suitable arrangement of the lamp of the present invention in case of forming an image of an original by a lens the peripheral portion of copy sheet may be prevented from becoming dark, that is the whole surface of the sheet may be uniformly illuminated.
  • the present invention has been so far described with particular reference of the embodiment thereof, but it will be understood that variations and modifications can be effected without departing from the true spirit of the invention as described hereinabove and as defined in the appended claim.
  • a gas-filled lamp for a photocopying machine comprising a pair of tubular side sections;
  • a tubular main member having a substantially constant cross-sectional area therealong, said main member having bent ends forming a continuous attachment to a respective side section, each side section extending at to said main member, said main member being coated with fluorescent material, and said coating being applied to both said bent ends and terminating at said attachment to said side sections;
  • each said side section being substantially shorter than the length of either of said end members so that said main and end members are located in close parallel proximity to each other;
  • each said bent end of said main member having an outer curved surface and an inner curved surface defining an end cross section area therebetween, the radius of said outer curved surface being greater than the radius of said inner curved surface;
  • end cross-sectional area adjacent said inner curved surface having a reduced portion so that said end cross-sectional area is less than said substantially constant crosssectional area along said main member.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamp (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)

Abstract

A rectangularly shaped gas-filled lamp for photocopying machines having a main portion bent at right angles at its ends. The bent ends have a larger radius at the outer surface than at the inner surface, and the inner surface has a reduced portion to decrease the cross-sectional area and provide more brightness at the bent ends.

Description

United States Patent Inventor Appl. No.
Filed Patented Assignee Priority Walther von Grabe Koenigstein, Germany Apr. 30, 1969 Jan. 11, 1972 Kabushiki Kaisha Ricoh Tokyo, Japan Apr. 30, 1968 Japan 43/2903] RECTANGULARLY-SHAPED GAS-FILLED LAMP FOR PHOTOCOPYING MACHINES 1 Claim, 4 Drawing Figs.
US. Cl 313/109, 313/220 Int. Cl H0lj 61/30, H01 j 61/44 Field 01' Search 313/109,
Primary Examiner- Roy Lake Assistant Examiner- Palmer C. Demeo AnorneyBurgess, Ryan & Hicks ABSTRACT: A rectangularly shaped gas-filled lamp for photocopying machines having a main portion bent at right angles at its ends. The bent ends have a larger radius at the outer surface than at the inner surface, and the inner surface has a reduced portion to decrease the cross-sectional area and provide more brightness at the bent ends.
RECTANGULARLY SHAPED GAS-FILLED LAMP FOR PHOTOCOPYING MACHINES BACKGROUND OF THE INVENTION The present invention relates to a photocopying lamp and more particularly a gas-filledlamp best suited for photocopy: mg.
Generally, the photocopying machine must be compact in size and easy to operate so that it may be operated even in a small room. But such machine is not available at present.
There has been known a photocopying machine of the type in which an original to be copied is not illuminated at its whole surface, but the original is partially illuminated one portion at a time, sequentially, by a moving lamp until the whole surface is illuminated. However, it is difficult to incorporate a tubular lamp in the photocopying machine of the type described because the electrical connection members are attached to the ends of the tubular lamp so that no light is emitted therefrom. Furthermore, the light varies in intensity and color along the longitudinaldirection of the tubular lamp.
In the photocopying machine of the type described, because of the variation in intensity and color of the light produced from the lamp, only the light emitted from a relatively narrower portion in the vicinity of the center of the lamp is actually utilized for illumination. That is, the substantial portions adjacent to the ends of the lamp, which also produce light, extend beyond the side edges of the original. Therefore, extra space must be allowed outwardly of the side edges of the original so that the ends of the tubular lamp may pass freely. However, such space is wasted as it is not utilized for other purposes. When the width of the exposure in the photocopying machine is equal to that of the space for mounting the tubular lamp, the conventional lamp having the construction as described above cannot be used. For these reasons, the photocopying machine of the type in which a tubular lamp is movably mounted for scanning exposure is inevitably large "'1 size.
SUMMARY OF THE INVENTION In brief, the present invention provides a gas-filled lamp for photocopying comprising a tubular main member for utilizing substantially all of the light produced. A tubular side member is formed integral with the main member by bending at least one end thereof, and a bending member is provided between the main and side members having a smaller cross-sectional area than those of the main and side members. The effective length of the lamp, that is the main member, is made equal to the length of the lamp effective for emitting the illumination lights to be actually used.
In one embodiment of the present invention having the construction as described above, the bending member is bent to at least an angle of 90 and the inner side thereof is reduced, thereby reducing its cross-sectional area.
In another embodiment of the present invention, the lamp is formed rectangular in shape so that a longer side constitutes the main member for emitting the required light and the electrical connection members are attached in opposed relation with each other to the ends of the lamp symmetrical about the center of the longer side. The cross-sectional area at each end of the longer side, that is the main member, has a reduced cross-sectional area by providing a reduced portion extending inwardly from the inner side of the end portion of the main body. The side member, that isthe shorter sides of the rectangle are made as short as possible. The main member, that is the longer side, is coated with fluorescent or phosphor material and this coating is preferably extended beyond the main member up to the side members. Alternatively, the coating may extend substantially beyond the center of the side members.
In a further embodiment of the present invention, the outer side of the bending member is rounded so that the outer generating line of the main member connects to that of the side member through the outer. generating line having a large radius of curvature. This provides the same effect as that attained when the main member is extended linearly beyond the bending members. By reducing the inner side of the bending member the intensity of illumination at the portions in the vicinity of the bending members can be increased.
The lamp according to the present invention can eliminate the defect known as vignette effect.
One of the objects of the present invention is to provide a photocopying machine compact in size.
Another object of the invention is to eliminate the variation in intensity of light in the longitudinal direction of a lamp.
The above and other objects, features and advantages of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawing.
BRIEF DESCRIPTION OF DRAWING FIG. I is a side view of one embodiment of the present invention;
FIG. 2 is a plan view thereof, viewed in the direction of the arrow II in FIG. 1;
FIG. 3 is a perspective view of one example of the arrangement thereof; and
FIG. 4 is an explanatory view of another example of the arrangement thereof.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, the lamp construction includes a main member 10, two side members 12 and two end members 14 coupled substantially at right angles to the side members 12 and in parallel with the main member 10.
These members 10, 12 and 14 form substantially rectangular shape as shown in FIG. 1. The produced light is emitted from the side of the main member 10 which is coated with fluorescent material so as to produce afterglow as shown by the crosshatched portion in FIG. 1. The side members 12 are positioned substantially at right angles relative to the main member 10, and at the bending portion 13 of the side member 12 a reduced portion 16 is provided. As compared to the case when the bend portion 13 is formed as shown by the broken line 18 in FIG. 1, the reduced portions 16 serve to cause the filamentlike current to pass more closely to the outer surface 20, that is the generating line, of the main member 10. In order to control the light emitted from the main member 10, that is the intensity of illumination, the connecting surface connecting the outer surface 20 of the main member 10 and the outer surface, generating line, of the side member 12 has a relatively larger radius of curvature as shown by a contour line 22. That is, the radius of the connecting surface 22 is larger than that surface connecting the side and end members as shown by 26 or by a broken line 24.
The fluorescent coating is applied up to the boundary lines 28 between the main and side members 10 and 12. This coating may be applied beyond the center of the side member 12 so that the side member also advantageously provides the light transmission.
At the ends of the end members 14 are attached electrical connection members 30 each having a fixed knurled nut for connection to a cable head of the wire.
The lamp having the construction described above with reference to FIGS. 1 and 2 may be utilized for example as shown in FIG. 3. That is, in this arrangement an original to be copied is placed upon a glass plate 36 and illuminated by a lamp 34. It is not necessary that outer end edges 38 of the glass plate 36 be extended beyond the outermost generating line of the side member 12. Alternatively, the edge 38 may be extended only a little beyond the side member 12. The lamp 34 is mounted upon a suitable carriage (not shown) and is moved in the direction indicated by the arrow 42 in parallel with the glass plate 36. If required a plurality of lamps 34 may be mounted upon the lamp carriage in side-by-side relation. When the lamp carriage is moved, the whole surface of the original is illuminated.
The fluorescent coating extending beyond the boundary line 29 (shown in FIG. 3), that is substantially beyond the center of the side member 12 provides light emission as shown by the arrows 44. That is, the loss of the light emission that would be expected due to the main member not being extended is compensated by the arrangement of the lamp 34 as shown in FIG. 3 without adversely affecting the distribution and the intensity of the light.
Since the lamp 34 may be held in position by means of the connection members 30, it is not necessary to design the length of the lamp carriage longer than that of the lamp 34.
By providing the reduced portion 16 in the glass wall, the bending portion 12 will have a smaller cross-sectional area. The reduced portion extends toward the discharge space in the main member 10 at an angle of 10 to 90, preferably 45, so that the gaseous discharge may be effected in the main member 10 at a portion closer to the light emission portion thereof.
Another arrangement of the lamp of the present invention is shown in FIG. 4. Upon the glass plate 36 is placed a page of an opened book, Bo which is illuminated by the lamp 34 for focus through lens L on copy sheet ba. In this case, the rectangular side of the lamp 34 is positioned substantially in parallel with the glass plate 36. This arrangement can prevent the peripheral portion of an image of the page to be copied from becoming dark.
From the foregoing, it will be seen that the lamp carriage may be made substantially equal in length to the lamp so that much space can be saved, and the photocopying machine can be made compact in size and light in weight. Furthermore, by a suitable arrangement of the lamp of the present invention in case of forming an image of an original by a lens the peripheral portion of copy sheet may be prevented from becoming dark, that is the whole surface of the sheet may be uniformly illuminated. The present invention has been so far described with particular reference of the embodiment thereof, but it will be understood that variations and modifications can be effected without departing from the true spirit of the invention as described hereinabove and as defined in the appended claim.
1 claim:
1. A gas-filled lamp for a photocopying machine comprising a pair of tubular side sections;
a tubular main member having a substantially constant cross-sectional area therealong, said main member having bent ends forming a continuous attachment to a respective side section, each side section extending at to said main member, said main member being coated with fluorescent material, and said coating being applied to both said bent ends and terminating at said attachment to said side sections;
a pair of tubular end members, each equal in length and forming a continuous attachment with a respective one of said side sections and extending at 90 to said side section toward each other and having end portions terminating in substantially close proximity with electrical connections attached to said respective terminating end portions;
said main member, side sections and end members forming a substantially rectangularly shaped lamp, the length of each said side section being substantially shorter than the length of either of said end members so that said main and end members are located in close parallel proximity to each other;
each said bent end of said main member having an outer curved surface and an inner curved surface defining an end cross section area therebetween, the radius of said outer curved surface being greater than the radius of said inner curved surface; and
said end cross-sectional area adjacent said inner curved surface having a reduced portion so that said end cross-sectional area is less than said substantially constant crosssectional area along said main member.

Claims (1)

1. A gas-filled lamp for a photocopying machine comprising a pair of tubular side sections; a tubular main member having a substantially constant crosssectional area therealong, said main member having bent ends forming a continuous attachment to a respective side section, each side section extending at 90* to said main member, said main member being coated with fluorescent material, and said coating being applied to both said bent ends and terminating at said attachment to said side sections; a pair of tubular end members, each equal in length and forming a continuous attachment with a respective one of said side sections and extending at 90* to said side section toward each other and having end portions terminating in substantially close proximity with electrical connectIons attached to said respective terminating end portions; said main member, side sections and end members forming a substantially rectangularly shaped lamp, the length of each said side section being substantially shorter than the length of either of said end members so that said main and end members are located in close parallel proximity to each other; each said bent end of said main member having an outer curved surface and an inner curved surface defining an end cross section area therebetween, the radius of said outer curved surface being greater than the radius of said inner curved surface; and said end cross-sectional area adjacent said inner curved surface having a reduced portion so that said end cross-sectional area is less than said substantially constant cross-sectional area along said main member.
US820577A 1968-04-30 1969-04-30 Rectangularly shaped gas-filled lamp for photocopying machines Expired - Lifetime US3634716A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481442A (en) * 1981-03-31 1984-11-06 Patent Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Low-pressure mercury vapor discharge lamp, particularly U-shaped fluorescent lamp, and method of its manufacture
DE29701200U1 (en) * 1997-01-24 1997-03-20 Böhm, Werner, 98693 Ilmenau Gas discharge tube
US20090279178A1 (en) * 2008-05-09 2009-11-12 Chengwu Cui Scanhead For Image Illumination Uniformity And Method Thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9601418D0 (en) * 1996-01-24 1996-03-27 England Paul Lighting device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2392661A (en) * 1944-08-10 1946-01-08 Gen Electric Base for electric lamps or similar devices
CA469166A (en) * 1950-11-07 Canadian General Electric Company Electric lamps of double spiral convolutions
US2562740A (en) * 1948-03-13 1951-07-31 Charles E Rose Illuminating device for automobile license plates
US2618089A (en) * 1949-09-17 1952-11-18 Charles E Rose Automobile license plate holder
US2623988A (en) * 1948-05-24 1952-12-30 Electrical Products Corp Tube and support combination for illuminated signs
US2726587A (en) * 1951-12-03 1955-12-13 Richard S Cutter Photographic contact printer
US2739261A (en) * 1951-10-13 1956-03-20 Hartford Nat Bank & Trust Co Tubular gas discharge lamp
US2743388A (en) * 1953-09-08 1956-04-24 Samuel C Bartley Electric lamp
US3300633A (en) * 1964-08-17 1967-01-24 Richards Corp Unitary serpentine tubular light source and mounting means and method of making

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA469166A (en) * 1950-11-07 Canadian General Electric Company Electric lamps of double spiral convolutions
US2392661A (en) * 1944-08-10 1946-01-08 Gen Electric Base for electric lamps or similar devices
US2562740A (en) * 1948-03-13 1951-07-31 Charles E Rose Illuminating device for automobile license plates
US2623988A (en) * 1948-05-24 1952-12-30 Electrical Products Corp Tube and support combination for illuminated signs
US2618089A (en) * 1949-09-17 1952-11-18 Charles E Rose Automobile license plate holder
US2739261A (en) * 1951-10-13 1956-03-20 Hartford Nat Bank & Trust Co Tubular gas discharge lamp
US2726587A (en) * 1951-12-03 1955-12-13 Richard S Cutter Photographic contact printer
US2743388A (en) * 1953-09-08 1956-04-24 Samuel C Bartley Electric lamp
US3300633A (en) * 1964-08-17 1967-01-24 Richards Corp Unitary serpentine tubular light source and mounting means and method of making

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481442A (en) * 1981-03-31 1984-11-06 Patent Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Low-pressure mercury vapor discharge lamp, particularly U-shaped fluorescent lamp, and method of its manufacture
DE29701200U1 (en) * 1997-01-24 1997-03-20 Böhm, Werner, 98693 Ilmenau Gas discharge tube
US20090279178A1 (en) * 2008-05-09 2009-11-12 Chengwu Cui Scanhead For Image Illumination Uniformity And Method Thereof

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GB1272615A (en) 1972-05-03
JPS4818070B1 (en) 1973-06-02

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