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US 7,465,081 B2Granted
Lighting system
AssigneeEastman Kodak Company
InventorTaro Kushida
Life of this patent
Estimating the term…
Abstract
A compact or thin lighting system is provided. Light fluxes emitted from an arc tube 22 are made to enter from a light reception face c1 of an optical member 24 from a reflector 24 and to emit from a light emission face c3 orthogonal to the light reception face c1. Light fluxes entering the light emission face c3 at a small angle are reflected and turned to a main reflection face c2, and then emitted from the light emission face c3. By using total internal reflection of the light emission face, the size and thickness can be decreased.
Claims14
A lighting system comprising:
- a light source:
- a reflector for reflecting some of light fluxes emitted from the light source;
- an optical member, wherein the optical member includes:
- a light reception face for receiving light fluxes from the light source and the reflector;
- a main light reflection face for reflecting light fluxes toward an object side;
- a light emission face which directs light fluxes directly incoming from the light reception face towards a main reflection face though total internal reflection, and transmits light directly incoming from the main light reflection face such that the light is emitted towards the object side;
- wherein the reflector has a concave portion opposed to the light reception face with respect to the light source, a first linear portion extending from one end of the concave portion to an object side end of the light reception face, and a second linear portion extending from the other end of the concave portion to an end of the light reception face opposite from the object side end, and the first linear portion reflects light fluxes from the light source or the second linear portion towards the main light reflection face or the light emission face;
- and
- wherein the main reflection face has a face in which an angle formed with the light reception face is greater than or equal to 40° and less than or equal to 70°.
6 more elements
A lighting system comprising:
- a light source;
- a reflector for reflecting some of light fluxes emitted from the light source;
- an optical member, wherein the optical member includes:
- a light reception face for receiving light fluxes from the light source and the reflector;
- a main light reflection face for reflecting light fluxes toward an object side;
- a light emission face which directs light fluxes directly incoming from the light reception face towards a main reflection face through total internal reflection, and transmits light directly incoming from the main light reflection face such that the light is emitted towards the object side;
- wherein the reflector has a concave portion opposed to the light reception face with respect to the light source, a first linear portion extending from one end of the concave portion to an object side end of the light reception face, and a second linear portion extending from the other end of the concave portion to an end of the light reception face opposite from the object side end, and the first linear portion reflects light fluxes from the light source or the second liner portion towards the main light reflection face or the light emission face;
- wherein the concave portion of the reflector has a semicircular arc shape, and
- in a cross-sectional plane which is orthogonal to both the light reception face and the light emission face, the angle formed between the light reception face and the first liner portion is greater than or equal to 30° and less than or equal to 75°.
6 more elements
A lighting system comprising:
- a light source;
- a reflector for reflecting some of light fluxes emitted from the light source;
- an optical member, wherein the optical member includes:
- a light reception face for receiving light fluxes from the light source and the reflector;
- a main light reflection face for reflecting light fluxes toward an object side;
- a light emission face which directs light fluxes directly incoming from the light reception face towards a main reflection face through total internal reflection, and transmits light directly incoming from the main light reflection face such that the light is emitted towards the object side;
- wherein the reflector has a concave portion opposed to the light reception face with respect to the light source, a first liner portion extending from one end of the concave portion to an object side end of the light reception face, and a second linear portion extending from the other end of the concave portion to an end of the light reception face opposite from the object side end, and the first linear portion reflects light fluxes from the light source or the second liner portion towards the main light reflection face or the light emission face;
- and
- wherein a light flux directly reaching the first linear portion from the light source is reflected to directly reach the main reflection face.
6 more elements
A lighting system comprising:
- a light source;
- a reflector for reflecting some of light fluxes emitted from the light source;
- an optical member, wherein the optical member includes:
- a light reception face for receiving the fluxes from the light source and the reflector;
- a main light reflection face for reflecting light fluxes toward an object side;
- a light emission face which directs light fluxes directly incoming from the light reception face towards a main reflection face through total internal reflection, and transmits light directly incoming from the main light reflection face such that the light is emitted towards the object side;
- wherein the reflector has a concave portion opposed to the light reception face with respect to the light source, a first linear portion extending from one end of the concave portion to an object side end of the light reception face, and a second linear portion extending from the other end of the concave portion to an end of the light reception face opposite from the object side end, and the first linear portion reflects light fluxes from the light source or the second linear portion towards the main light reflection face or the light emission face;
- and
- wherein a light flux reflected from the second linear portion and reaching the first linear portion is reflected and directly reaches the main reflection face.
6 more elements
A lighting system comprising:
- a light source;
- a reflector for reflecting some of light fluxes emitted from the light source;
- an optical member, wherein the optical member includes:
- a light reception face for receiving light fluxes from the light source and the reflector;
- a main light reflection face for reflecting light fluxes toward an object side;
- a light emission face which directs light fluxes directly incoming from the light reception face towards a main reflection face through total internal reflection, and transmits light directly incoming from the main light reflection face such that the light is emitted towards the object side;
- wherein the reflector has a concave portion opposed to the light reception face with respect to the light source, a first linear portion extending from one end of the concave portion to an object side end of the light reception face, and a second linear portion extending from the other end of the concave portion to an end of the light reception face opposite from the object side end, and the first linear portion reflects light fluxes from the light source or the second linear portion towards the main light reflection face or the light emission face;
- and
- wherein a light flux emitted from the light source or reflected from the second linear portion and reaching the first linear portion is reflected directly towards the light emission face.
6 more elements
A lighting system comprising:
- a light source;
- a reflector for reflecting some of light fluxes emitted from the light source;
- an optical member, wherein the optical member includes:
- a light reception face for receiving light fluxes from the light source and the reflector;
- a main light reflection face for reflecting light fluxes toward an object side;
- a light emission face which directs light fluxes directly incoming from the light reception face towards a main reflection face through total internal reflection, and transmits light directly incoming from the main light reflection face such that the light is emitted towards the object side;
- wherein the reflector has a concave portion opposed to the light reception face with respect to the light source, a first linear portion extending from one end of the concave portion to an object side end of the light reception face, and a second linear portion extending from the other end of the concave portion to an end of the light reception face opposite from the object side end, and the first linear portion reflects light fluxes from the light source or the second linear portion towards the main light reflection face or the light emission face;
- wherein
- the main reflection face has a first reflection portion close to the light reception face and a second reflection portion far from the light reception face, and
- the second reflection portion is set to a position reached by all of the light fluxes which directly travel from the light source to the light emission face and are totally reflected from the light emission face.
7 more elements
A lighting system comprising:
- a light source;
- a reflector for reflecting some of light fluxes emitted from the light source;
- an optical member, wherein the optical member includes:
- a light reception face for receiving light fluxes from the light source and the reflector;
- a main light reflection face for reflecting light fluxes toward an object side;
- a light emission face which directs light fluxes directly incoming from the light reception face towards a main reflection face through total internal reflection, and transmits light directly incoming from the main light reflection face such that the light is emitted towards the object side;
- wherein the reflector has a concave portion opposed to the light reception face with respect to the light source, a first linear portion extending from one end of the concave portion to an object side end of the light reception face, and a second linear portion extending from the other end of the concave portion to an end of the light reception face opposite from the object side end, and the first linear portion reflects light fluxes from the light source or the second linear portion towards the main light reflection face or the light emission face;
- and
- wherein:
- the light reception face is orthogonal to the light emission face,
- the reflector has a semicircular arc portion formed at the opposite side to the light reception face about the light source, the first liner portion formed between an end of the semicircular arc portion and the light emission face, and the second linear portion formed between the other end of the semicircular arc and the main reflection face;
- and
- the main reflection face has a first reflection portion close to the light reception face and a second reflection portion far from the light reception face,
- a light reflux directing reaching the first linear portion from the light source and reflected here directly reaches the first reflection portion of the main reflection face, and
- a light flux directly reaching the light emission face from the light source and reflected here directly through total internal reflection reaches the second reflection portion of the main reflection face.
12 more elements
A lighting system comprising:
- a light source;
- a reflector for reflecting some of light fluxes emitted from the light source;
- and
- an optical member, wherein the optical member includes:
- a light reception face for receiving light fluxes from the light source and the reflector;
- a main light reflection face for reflecting light fluxes toward an object side;
- and
- a light emission face which directs light fluxes directly incoming from the light reception face towards a main reflection face through total internal reflection, and transmits light directly incoming from the main light reflection face such that the light is emitted towards the object side;
- wherein the reflector has a concave portion opposed to the light reception face with respect to the light source, a first linear portion extending from one end of the concave portion to an object side end of the light reception face, and a second linear portion extending from the other end of the concave portion to an end of the light reception face opposite from the object side end, and the first linear portion reflects light fluxes from the light source or the second linear portion towards the main light reflection face or the light emission face;
- and
- wherein the light source is a cylindrical flash discharge tube.
8 more elements
Dependencies are inferred from the claim text.