US1711478A - Light reflector - Google Patents

Light reflector Download PDF

Info

Publication number
US1711478A
US1711478A US16552A US1655225A US1711478A US 1711478 A US1711478 A US 1711478A US 16552 A US16552 A US 16552A US 1655225 A US1655225 A US 1655225A US 1711478 A US1711478 A US 1711478A
Authority
US
United States
Prior art keywords
reflector
surface
facing
curve
portion
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 - Lifetime
Application number
US16552A
Inventor
Jr Cromwell A B Halvorson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US16552A priority Critical patent/US1711478A/en
Priority claimed from US7301025 external-priority patent/US1711480A/en
Application granted granted Critical
Publication of US1711478A publication Critical patent/US1711478A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00Reflectors for light sources
    • F21V7/04Optical design

Description

April 3 1929. c. A. B. HALVORSON, JR 11, 78

LIGHT REFLECTOR Filed March 18, 1925 Inventor: Cromwell A. DHalvorson, Jr:

H18 Attorneg.

Patented Apr 1929.

'UNITED STATES CROMWELL A. B. mvoizson, an, or LYNN, .MASSACHUSETTS, assrenon 'ro GEN-y v 1,711,478 PATENT OFFICE.

ERAL ELECTRIC COMPA NY, A CORPORATION OF NEW YORK.

LIGHT nnrmcron.

Application filed- March 18, 1925. Serial No, 16,552.

My invention relates to a light reflector of a type which is especially adapted for use in traffic signal devices. The invention Wlll be readily-understood from the accompanying specification, reference being had to the accompanying drawing in which the figure is a side view of a. section of the reflector taken along an axial planea Referring more in detail to the drawings, it will be seen that the reflector is provided with a rear opening 2 through which a socket for a light bulb may be inserted. The reflector is also provided with a front opening 3 through which the rays that go to make up the beam from the projector pass forward. 7 The rear portion 4 of the reflector immediately around the opening 2 and extending for some distance therefrom is paraboloidal in form. Beyond the paraboloidal region and extending as far as the ridge 5 the section 6 is spherical. The portion 7 of the reflector to the right of the ridge 5 is also .spherical but has a different curvature than the. region 6." Beyond the spherical region 7 the flaring portion 8 of the reflector is paraboloidal or it may be a surface of revolution generated by any one of the conics.

The center of curvature 6 of the spherical region along an axial plane I have indicated at the point 9. The point 10, on the other hand, is the focal point for the paraboloidal regions 4 and 8 and the central point ofthe spherical region. 7. The reflector, therefore, as shown in the drawing conslsts of a surface of revolution formed by revolving a curve about the axis of the reflector, which axis passes through the focal point 10. The

curve as shown. consists of four conics 4, 6, 7, and 8, three of which; to wit: curves 4, 6 and 8, are so positioned with respect to the a focal point that rays originating in the focal point are reflected to the right of the focal plane, while the fourth curve, namely, curve 7, is so positioned with respect to the focal point that the rays originating in the focal point are reflected to the left of the focal plane. The arrows in the figure indicate how the rays that go to make up a beam from a light source located at the point 10 pass out of the reflector. It will be seen that with a reflector of this type a very wide angle of projection is obtained.

It will be understood that whereas I have described my invention in connection with specific construction illustrated I do not wish to be limited to such specific construction inasmuch as various modifications may be made within the scope of my invention and of the claims herein contained.

What I claim as new and desire to secure by Letters Patent of the United States, is

1. A reflector having a reflecting surface in the form of a surface of revolution, said surface being produced by rotating a curve about the axis of the reflector, said curve consisting of four conics, three of said conics facing in one direction with respect to the focal plane of the reflector and the fourth conic facing in the opposite direction with respect to said focal plane, said conics being arranged in the following order from the origin of the surface of'revolution, two facing inonedirection followed by one facing in the tion of a circle, and the fourth a parabola,

both parabolas having a common focal oint, said circle sections having radii of di erent lengths.

2; A reflector having a reflecting surface in the form of a surface of revolution, said surface being produced by rotating a curve about the axis of the reflector,said curve consisting of four conics, three of said conics facing in one direction with respect to the focal plane of the reflector and the fourth conic facing in the opposite direction with respect to said focal plane, said conics being arranged in the following order from the origin of the surfaceof revolution, two facing in one direction followed by one facing in theopposite direction and the latter followed by the last facing in the same direction as the first two, the first curve in order being a parabola, the second and the third, each the section of a circle, and the fourth a parabola, both parabolas having a common focal oint, said circle sections having radii of di erent lengths, the center of curvature of one" of said circular sections being located on said axis and the center of curvature of the other section of a circle falling outside of the said axis.

3.- A reflector comprising focalizing surfaces of revolution generated about an axis, said reflector being provided with a rear opening and with a front opening, said axis passing through the center of said openings, the rear portion of the reflector formed about i said rear opening with its focalizin surface facing toward the front opening an a front portion of the reflector being ormed about I the front opening and located with its focalijz- 5 ing surface facing toward therear opening,

m ing at the same plane, the diameter of the front portion of the'reflector at said plane being greater than the diameter of 'therea'r portion of the reflector at the same the front and rear portions of there ector bending" abruptly to meet each other along said plane and form a .ridge about said reflector along said plane, said reflector having a flaring surface about the front opens ing joining the forward portion of the said -front section of the reflector, and the flaring portion of the reflector facing in the same direction as the rear portion .of'the reflector the rear surface being part'paraboloidal' an lane,

paraboloidal and the front portion next to said plane being spherical. I

4. A focalizing reflector having a reflecting surface in the form of a surface of revolution produced by rotating a curve about an axis, said curve consisting of four conics arranged in the following order from rear to front, a parabola, a circle, a second circle and a parabola, said surface having a rear parabo ic portion, two spherical portions,-one being concentric and the other being eccentric, and a front parabolic portion, said parabola sections'and one of said circle sections having a common focal point and the radii of said circle sections crossing each other, the focal point of said other circle section being located outside of the focal sections. p

In witness whereof, I'have hereunto set my hand this 16th day' of March, 1925.

.CROMWELL A512. HALVORSON, JR.

point of said parabola

US16552A 1925-03-18 1925-03-18 Light reflector Expired - Lifetime US1711478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16552A US1711478A (en) 1925-03-18 1925-03-18 Light reflector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16552A US1711478A (en) 1925-03-18 1925-03-18 Light reflector
US7301025 US1711480A (en) 1925-03-18 1925-12-03 Light-projecting device

Publications (1)

Publication Number Publication Date
US1711478A true US1711478A (en) 1929-04-30

Family

ID=21777711

Family Applications (1)

Application Number Title Priority Date Filing Date
US16552A Expired - Lifetime US1711478A (en) 1925-03-18 1925-03-18 Light reflector

Country Status (1)

Country Link
US (1) US1711478A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629046A (en) * 1951-01-03 1953-02-17 Liberman Milton Lamp supported reflector unit
US3132812A (en) * 1961-08-29 1964-05-12 Eastman Kodak Co Flash reflector with improved corner illumination
US4651262A (en) * 1984-12-31 1987-03-17 Valtion Teknillinen Tutkimuskeskus Lighting device
US4686612A (en) * 1985-10-25 1987-08-11 Optech Inc. Lamp reflector assembly
US4750097A (en) * 1985-10-25 1988-06-07 Optech Inc. Lamp reflector assembly
US5143447A (en) * 1990-08-09 1992-09-01 Bertenshaw David R Lamp system having a torroidal light emitting member
US5235499A (en) * 1990-08-09 1993-08-10 Strand Lighting Limited Lamp system having a torroidal light emitting member
US6161946A (en) * 1998-11-09 2000-12-19 Bishop; Christopher B. Light reflector
US20040032728A1 (en) * 2002-08-19 2004-02-19 Robert Galli Optical assembly for LED chip package
US20070211471A1 (en) * 2003-10-27 2007-09-13 Wimberly Randal L Dual Reflector System
US20090086481A1 (en) * 2007-09-21 2009-04-02 Cooper Technologies Company Diverging Reflector
US20090262530A1 (en) * 2007-09-19 2009-10-22 Cooper Technologies Company Light Emitting Diode Lamp Source
US20100091495A1 (en) * 2008-10-10 2010-04-15 Cooper Technologies Company Modular Extruded Heat Sink
US20100208460A1 (en) * 2009-02-19 2010-08-19 Cooper Technologies Company Luminaire with led illumination core
US20110019409A1 (en) * 2009-07-21 2011-01-27 Cooper Technologies Company Interfacing a Light Emitting Diode (LED) Module to a Heat Sink Assembly, a Light Reflector and Electrical Circuits
US8100556B2 (en) 2007-09-19 2012-01-24 Cooper Technologies, Inc. Light fixture with an adjustable optical distribution
US8272756B1 (en) 2008-03-10 2012-09-25 Cooper Technologies Company LED-based lighting system and method
US8596837B1 (en) 2009-07-21 2013-12-03 Cooper Technologies Company Systems, methods, and devices providing a quick-release mechanism for a modular LED light engine

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629046A (en) * 1951-01-03 1953-02-17 Liberman Milton Lamp supported reflector unit
US3132812A (en) * 1961-08-29 1964-05-12 Eastman Kodak Co Flash reflector with improved corner illumination
US4651262A (en) * 1984-12-31 1987-03-17 Valtion Teknillinen Tutkimuskeskus Lighting device
US4686612A (en) * 1985-10-25 1987-08-11 Optech Inc. Lamp reflector assembly
US4750097A (en) * 1985-10-25 1988-06-07 Optech Inc. Lamp reflector assembly
US5143447A (en) * 1990-08-09 1992-09-01 Bertenshaw David R Lamp system having a torroidal light emitting member
US5235499A (en) * 1990-08-09 1993-08-10 Strand Lighting Limited Lamp system having a torroidal light emitting member
US6161946A (en) * 1998-11-09 2000-12-19 Bishop; Christopher B. Light reflector
US20040032728A1 (en) * 2002-08-19 2004-02-19 Robert Galli Optical assembly for LED chip package
US20070211471A1 (en) * 2003-10-27 2007-09-13 Wimberly Randal L Dual Reflector System
US9163807B2 (en) 2007-09-19 2015-10-20 Cooper Technologies Company Heat management for a light fixture with an adjustable optical distribution
US8939608B1 (en) 2007-09-19 2015-01-27 Cooper Technologies Company Heat management for a light fixture with an adjustable optical distribution
US20090262530A1 (en) * 2007-09-19 2009-10-22 Cooper Technologies Company Light Emitting Diode Lamp Source
US8696169B2 (en) 2007-09-19 2014-04-15 Cooper Technologies Company Light emitting diode lamp source
US8256923B1 (en) 2007-09-19 2012-09-04 Cooper Technologies Company Heat management for a light fixture with an adjustable optical distribution
US8100556B2 (en) 2007-09-19 2012-01-24 Cooper Technologies, Inc. Light fixture with an adjustable optical distribution
US8911121B2 (en) 2007-09-21 2014-12-16 Cooper Technologies Company Light emitting diode recessed light fixture
US7993034B2 (en) * 2007-09-21 2011-08-09 Cooper Technologies Company Reflector having inflection point and LED fixture including such reflector
US9400093B2 (en) 2007-09-21 2016-07-26 Cooper Technologies Company Thermal management for light emitting diode fixture
US9709253B2 (en) 2007-09-21 2017-07-18 Cooper Lighting, Llc Light emitting diode recessed light fixture
US8789978B2 (en) 2007-09-21 2014-07-29 Cooper Technologies Company Light emitting diode recessed light fixture
US8491166B2 (en) 2007-09-21 2013-07-23 Cooper Technologies Company Thermal management for light emitting diode fixture
US20090129086A1 (en) * 2007-09-21 2009-05-21 Cooper Technologies Company Thermal Management for Light Emitting Diode Fixture
US20090086481A1 (en) * 2007-09-21 2009-04-02 Cooper Technologies Company Diverging Reflector
US8905602B2 (en) 2007-09-21 2014-12-09 Cooper Technologies Company Thermal management for light emitting diode fixture
US8272756B1 (en) 2008-03-10 2012-09-25 Cooper Technologies Company LED-based lighting system and method
US8529100B1 (en) 2008-10-10 2013-09-10 Cooper Technologies Company Modular extruded heat sink
US20100091495A1 (en) * 2008-10-10 2010-04-15 Cooper Technologies Company Modular Extruded Heat Sink
US8123382B2 (en) 2008-10-10 2012-02-28 Cooper Technologies Company Modular extruded heat sink
US20100208460A1 (en) * 2009-02-19 2010-08-19 Cooper Technologies Company Luminaire with led illumination core
US8596837B1 (en) 2009-07-21 2013-12-03 Cooper Technologies Company Systems, methods, and devices providing a quick-release mechanism for a modular LED light engine
US8567987B2 (en) 2009-07-21 2013-10-29 Cooper Technologies Company Interfacing a light emitting diode (LED) module to a heat sink assembly, a light reflector and electrical circuits
US9212792B2 (en) 2009-07-21 2015-12-15 Cooper Technologies Company Systems, methods, and devices providing a quick-release mechanism for a modular LED light engine
US20110019409A1 (en) * 2009-07-21 2011-01-27 Cooper Technologies Company Interfacing a Light Emitting Diode (LED) Module to a Heat Sink Assembly, a Light Reflector and Electrical Circuits
US9400100B2 (en) 2009-07-21 2016-07-26 Cooper Technologies Company Interfacing a light emitting diode (LED) module to a heat sink assembly, a light reflector and electrical circuits
US9810417B2 (en) 2009-07-21 2017-11-07 Cooper Technologies Company Quick-release mechanism for a modular LED light engine
US9810407B2 (en) 2009-07-21 2017-11-07 Cooper Technologies Company Interfacing a light emitting diode (LED) module to a heat sink

Similar Documents

Publication Publication Date Title
US3676667A (en) Optical projector device
US3453425A (en) Structure for concentrating radiant energy
US3443086A (en) Beam-forming system
US5894195A (en) Elliptical axial lighting device
US4447865A (en) Reflector lamp
US2224178A (en) Catadioptrical lens system
US3484599A (en) Optical projection system
US4974138A (en) Lighting device
JP3132530B2 (en) The light source device
US2002376A (en) Searchlight reflector
US6227685B1 (en) Electronic wide angle lighting device
US3522424A (en) Searchlight apparatus
US2599864A (en) Wave front modifying wave guide system
US1977689A (en) Optical system
US2739226A (en) Luminaire
US4494176A (en) Lamps having multiple and aimed parabolic sections for increased useful light output
US1998967A (en) Headlight
US4420800A (en) Reflector lamp with shaped reflector and lens
EP0798506B1 (en) Motor vehicle headlamp
SU1542425A3 (en) Dip-light headlamp
JP4773705B2 (en) Lighting module for vehicle headlight
US2050429A (en) Light mixing apparatus
JP2003123517A (en) Light projecting unit and led vehicular headlamp equipped with it
US3283142A (en) Light reflectors
US3835342A (en) Radiant energy collector or reflector