Patent EP0182397A1 successfully refreshed from Google Patents.
EP0182397A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus and method for automatically scoring a dart game
Assignee: Individual
•
Filing: 1985-09-20
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Granted: —
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Expires: 2005-09-20
Abstract
Abstract An automatic scoring apparatus (20) for a dart game utilizing a plurality of light detecting elements (36, 38) situated on the periphery of a dart board (28) is disclosed. These light detecting elements (36, 38), are aligned to receive light emitted by a plurality of light sources (32, 34) so that a dart (30) embedded in the dart board (28) will block the path of light from the light sources (32, 34) to the light detecting elements (36, 38). A microprocessor and associated electronic circuitry continually scan the light detecting elements (36, 38) to detect a decrease in the amount of light incident on any particular light detecting elements indicative of the presence of a dart (30) in the dart board (28). The location of the dart (30) is calculated mathematically from the shadow location information.
Inventors
- 👤 Royce Linton Cutler
- 👤 Edward Albert Hohmann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 12:48
CPC Classifications
F; F41; F41J; F41J5/00; F41J5/02; A; A63; A63F; A63F9/00; A63F9/02; A63F9/0291; Y; Y10; Y10S; Y10S273/00; Y10S273/26
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
131 words
An apparatus for locating a dart embedded in a dart board comprising: a housing for enclosing a dart board; means within said housing for illuminating a space adjacent to a surface of a dart board enclosed within said housing; means within said housing for detecting the presence of at least two shadows created by the presence of a dart within said illuminated space adjacent to a surface of a dart board enclosed within said housing when said dart is emboddea in said suface on a uart board enciosed witnin said housing; and means for utilizing the detection of said shadows created by the presence of said dart within said illuminated space adjacent to a surface of said dart board to calculate the location of said dart embedded in said dart board.
Claim 2
Independent Claim
131 words
An apparatus for locating a dart embedded in a dart board comprising: a housing for enclosing a dart board; means within said housing for illuminating a space adjacent to a surface of a dart board enclosed within said housing; means within said housing for detecting the presence of at least two shadows created by the presence of a dart within said illuminated space adjacent to a surface of a dart board enclosed within said housing when said dart is emboddea in said suface on a uart board enciosed witnin said housing; and means for utilizing the detection of said shadows created by the presence of said dart within said illuminated space adjacent to a surface of said dart board to calculate the location of said dart embedded in said dart board.
Claim 3
Dependent Claim
172 words
An apparatus as claimed in Claim 1 wherein said means within said housing for detecting at least two shadows created by the presence of a dart within said illuminated space adjacent to a surface of a dart board enclosed within said housing when said dart is embedded in said surface of a dart board enclosed within said housing comprises: a plurality of light detecting elements for monitoring the intensity of the illumination within said illuminated space adjacent to said surface of said dart board, said plurality of light detecting elements being located along a side of said dart board and oppositely located from said means within said housing for illuminating said illuminated space adjacent to said surface of said dart board, each of said plurality of light detecting elements being capable of detecting a reduced level of illumination incident on said light detecting element when said light detecting element ia within a shadow created by the presence of said dart within said illuminated space adjacent to said surface of said dart board.
Claim 4
Dependent Claim
147 words
An apparatus as claimed in Claim 2 wherein said means for utilizing the detection of said shadows created by the presence of said dart within said illuminated space adjacent to a surface of said dart board to calculate the location of said dart embedded in said dart board comprises: a microprocessor responsive to a set of machine instructions for calculating the location of said dart embedded in said dart board, said set of machine instructions utilioing ao input the output o! said plurality of light detecting elements; and electronic circuitry associated with said microprocessor for transmitting the output of each of said plurality of light detecting elements to said microprocessor to enable said microprocessor to identify which light detecting elements of said plurality of light detecting elements are detecting a reduced level of illumination indicative of the presence of a shadow on that particular light detecting element.
Claim 5
Independent Claim
390 words
An apparatus for locating a dart embedded in a dart board comprising: a housing for enclosing a dart board; first means within said housing for illuminating a space adjacent to a surface of a dart board enclosed within said housing; second means within said housing for illuminating said space adjacent to a surface of a dart board enclosed within said housing; a first plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said first plurality of light detecting elements being located on a side of said dart board and oppositely located from said first means within said housing for illuminating said space adjacent to a surface of said dart board, each of said first plurality of light detecting elements being capable of detecting a reduced level of illumination on said light deteoting oloment when said light detecting element is within a shadow created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board; a second plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said second plurality of light detecting elements being located on a side of said dart board oppositely located from said second means within said housing for illuminating said space adjacent to a surface of said dart board, each of said second plurality of light detecting elements oeing capable of detecting a reduced level of illumination on said light detecting element when said light detecting element is within a shadow created by the presence of a dart within said illuminated space adjacent to a surface of said dart board: and means for utilizing the detection of a shadow on said first plurality of light detecting elements and the detection of a shadow on said second plurality of light detecting elements creates by the prceonce of a data within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board to calculate the location of said dart embedded in said dart board.
Claim 6
Independent Claim
390 words
An apparatus for locating a dart embedded in a dart board comprising: a housing for enclosing a dart board; first means within said housing for illuminating a space adjacent to a surface of a dart board enclosed within said housing; second means within said housing for illuminating said space adjacent to a surface of a dart board enclosed within said housing; a first plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said first plurality of light detecting elements being located on a side of said dart board and oppositely located from said first means within said housing for illuminating said space adjacent to a surface of said dart board, each of said first plurality of light detecting elements being capable of detecting a reduced level of illumination on said light deteoting oloment when said light detecting element is within a shadow created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board; a second plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said second plurality of light detecting elements being located on a side of said dart board oppositely located from said second means within said housing for illuminating said space adjacent to a surface of said dart board, each of said second plurality of light detecting elements oeing capable of detecting a reduced level of illumination on said light detecting element when said light detecting element is within a shadow created by the presence of a dart within said illuminated space adjacent to a surface of said dart board: and means for utilizing the detection of a shadow on said first plurality of light detecting elements and the detection of a shadow on said second plurality of light detecting elements creates by the prceonce of a data within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board to calculate the location of said dart embedded in said dart board.
Claim 7
Dependent Claim
195 words
An apparatus as claimed in Claim 4 wherein said means for utilizing the detection of a shadow on said first plurality of light detecting elements and the detection of a shadow on said second plurality of light detecting elements to calculate the location of said dart embedded in said dart board comprises: a microprocessor responsive to a set of machine instructions for calculating the location of said dart embedded in said dart board, said set of machine instructions utilizing as input the output of said first plurality of light detecting elements and the output of said second plurality of light detecting elements; and electronic circuitry associated with said microprocessor for transmitting the output of each of said first plurality of light detecting elements to said microprocessor and for transmitting the output of each of said second plurality of light detecting elements to said microprocessor to enable said microprocessor to identify which light detecting elements of said first plurality of light detecting elements and which light detecting elements of said second plurality of light detecting elements are detecting a reduced level of illumination indicative of the presence of a shadow on that particular light detecting element.
Claim 8
Independent Claim
548 words
An apparatus for locating a dart embedded in a dart board comprising: a housing for enclosing a dart boards first means within said housing for illuminating a space adjacent to a surface of a dart board enclosed within said housing; second means within said housing for illuminating said space adjacent to a surface of a dart board enclosed within said housing; third means within said housing for illuminating said space adjacent to a surface of a dart board enclosed within said housing; a first plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said first plurality of light detecting elements being located on a side of said dart board and oppositely located from said first means within said housing for illuminating said space adjacent to a surface of said dart board, each of said first plurality of light detecting elements being capable of detecting a reduced level of illumination on said light detecting elements when said light detecting element is within a shadow created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board; a second plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said second plurality of light detecting elements being located on a side of said dart board and oppositely located from said second means within said housing for illuminating said space adjacent to a surface of said da:a board, each of said second plurality of light detecting elements being capable of detecting a reduced level of illumination on said light detecting elements when said light detecting element is within a shadow created by the presence of a dart within said illuminated apace adjacent to a surface of said dart board; a third plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said third plurality of light detecting elements being located on a side of said dart board and oppositely located from said third means within said housing for illuminating said space adjacent to a surface of said dart board, each of said third plurality of light detecting elements being capable of detecting a reduced level of illumination on said light detecting elements when said light detecting element is within a shadow created by the presence of a dart within said illuminated space adjacent to a surface of said dart board; and means for utilizing the detection of a shadow on said first plurality of light detecting elements and the detection of a shadow on said second plurality of light detecting elements and the detection of a shadow on said third plurality of light detecting elements created by the presence of a dart within said illuminated space adjacent to a surface nf said dart board when said dart is embedded in said surface of said dart board to calculate the location of said dart embedded in said dart board.
Claim 9
Independent Claim
548 words
An apparatus for locating a dart embedded in a dart board comprising: a housing for enclosing a dart boards first means within said housing for illuminating a space adjacent to a surface of a dart board enclosed within said housing; second means within said housing for illuminating said space adjacent to a surface of a dart board enclosed within said housing; third means within said housing for illuminating said space adjacent to a surface of a dart board enclosed within said housing; a first plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said first plurality of light detecting elements being located on a side of said dart board and oppositely located from said first means within said housing for illuminating said space adjacent to a surface of said dart board, each of said first plurality of light detecting elements being capable of detecting a reduced level of illumination on said light detecting elements when said light detecting element is within a shadow created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board; a second plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said second plurality of light detecting elements being located on a side of said dart board and oppositely located from said second means within said housing for illuminating said space adjacent to a surface of said da:a board, each of said second plurality of light detecting elements being capable of detecting a reduced level of illumination on said light detecting elements when said light detecting element is within a shadow created by the presence of a dart within said illuminated apace adjacent to a surface of said dart board; a third plurality of light detecting elements within said housing for monitoring the intensity of the illumination within said illuminated space adjacent to a surface of a dart board enclosed within said housing, said third plurality of light detecting elements being located on a side of said dart board and oppositely located from said third means within said housing for illuminating said space adjacent to a surface of said dart board, each of said third plurality of light detecting elements being capable of detecting a reduced level of illumination on said light detecting elements when said light detecting element is within a shadow created by the presence of a dart within said illuminated space adjacent to a surface of said dart board; and means for utilizing the detection of a shadow on said first plurality of light detecting elements and the detection of a shadow on said second plurality of light detecting elements and the detection of a shadow on said third plurality of light detecting elements created by the presence of a dart within said illuminated space adjacent to a surface nf said dart board when said dart is embedded in said surface of said dart board to calculate the location of said dart embedded in said dart board.
Claim 10
Dependent Claim
251 words
An apparatus as claimed in Claim 6 wherein said means for utilizing the detection of a shadow on said first plurality of light detecting elements and the detection of a shadow on said second plurality of light detecting elements and the detection of a shadow on said third plurality of light detecting elements to calculate the location of a dart embedded in said dart board comprises: a microprocessor responsive to a set of machine instructions for calculating the location of said dart embedded in said dart board, said set of machine instructions utilizing as input the output of said first plurality of light detecting elements and the output of said second plurality of light detecting elements and the output of said third plurality of light detecting elements; and electronic circuitry associated with said microprocessor for transmitting the output of each of said first plurality of light detecting elements to said microprocessor and for transmitting the output of each of said second plurality of light detecting elemento te said microprocessor and for transmitting the output of each of said third plurality of light detecting elements to said microprocessor to enable said microprocessor to identify which light detecting elements of said first plurality of light detecting elements and which light detecting elements of said second plurality of light detecting elements and which light detecting elements of said third plurality of light detecting elements are detecting a reduced level of illumination indicative of the presence of a shadow on that particular light detecting element.
Claim 11
Independent Claim
156 words
An apparatus for automatically scoring a dart game comprisingt a housing for enclosing a dart boards means within said housing for illuminating a space adjacent to a surface of a dart board enclosed within said housing; means within said housing for detecting the presence of at least two shadows created by the presence of a dart within said illuminated space adjacent to a surface of a dart board enclosed within said housing when said dart is embedded in said surface of a dart board enclosed within said housing; means for utilizing the detection of said shadows created by the presence of said dart within said illuminated space adjacent to a surface of said dart board to calcutate the location of said dart embedded in said dart boards and means for automatically calculating the score of said dart embedded in said surface of said dart board from the location of said dart embedded in said dart board.
Claim 12
Independent Claim
156 words
An apparatus for automatically scoring a dart game comprisingt a housing for enclosing a dart boards means within said housing for illuminating a space adjacent to a surface of a dart board enclosed within said housing; means within said housing for detecting the presence of at least two shadows created by the presence of a dart within said illuminated space adjacent to a surface of a dart board enclosed within said housing when said dart is embedded in said surface of a dart board enclosed within said housing; means for utilizing the detection of said shadows created by the presence of said dart within said illuminated space adjacent to a surface of said dart board to calcutate the location of said dart embedded in said dart boards and means for automatically calculating the score of said dart embedded in said surface of said dart board from the location of said dart embedded in said dart board.
Claim 13
Dependent Claim
63 words
An apparatus as claimed in Claim 8 wherein said means for automatically calculating the score of said dart embedded in said dart board comprises a microprocessor responsive to a set of machine instructions for calculating the score of said dart embedded in said dart board, said set of machine instructions utilizing as input the location of said dart embedded in said dart board.
Claim 14
Independent Claim
108 words
A method for locating a dart emboddod in a dart board comprising the steps of: illuminating a space adjacent to the surface of the dart board in which the dart is embedded; detecting the presence of at least two shadows created by the presence of the dart within said illuminated space adjacent to the surface of the dart board when said dart is embedded in said surface of said dart board; and calculating the location of said dart embedded in said dart board from the detection of said shadows created by the presence of said dart within said illuminated space adjacent to the surface of said dart board.
Claim 15
Independent Claim
108 words
A method for locating a dart emboddod in a dart board comprising the steps of: illuminating a space adjacent to the surface of the dart board in which the dart is embedded; detecting the presence of at least two shadows created by the presence of the dart within said illuminated space adjacent to the surface of the dart board when said dart is embedded in said surface of said dart board; and calculating the location of said dart embedded in said dart board from the detection of said shadows created by the presence of said dart within said illuminated space adjacent to the surface of said dart board.
Claim 16
Dependent Claim
122 words
A method as claimed in Claim 10 wherein the step of detecting the presence of at least two shadows created by the presence of the dart within said illuminated space adjacent to the surface of the dart board when said dart is embedded in said surface of said board comprises the steps of: monitoring the intensity of the illumination within said illuminated space with a plurality of light detecting elements located along at least one side of said dart boards and detecting a reduced level of illumination incident on at least one light detecting element of said plurality of light detecting elements when said light detecting element is within a shadow created by the presence of said dart within said illuminated space.
Claim 17
Dependent Claim
121 words
A method as claimed in Claim 11 where the step of calculating the location of said dart embedded in said dart board from the detection of said shadows created by the presence of said dart within said illuminated space adjacent to the surface of said dart board comprises the steps of: transmitting the output -of each of said plurality of light detecting elements to a microprocessor; identifying by said microprocessor which light detecting elements of said plurality of light detecting elements are detecting a reduced level of illumination indicative of the presence of a shadow on that particular light detecting element: and calculating by said microprocessor the location of said dart embedded in said dart board from the shadow location information.
Claim 18
Independent Claim
268 words
A method for locating a dart embedded in a dart board comprising the steps of: illuminating a space adjacent to the surface of the dart board in which the dart is embedded with a first illuminating means; monitoring the intensity of the illumination from said first illumination means within said illuminated space with a first plurality of light detecting elements located along a first side of said dart boardt detecting the presence of at least one shadow on said first plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart boards illuminating said space adjacent to the surface of the dart board in which the dart is embedded with a second illuminating means; monitoring the intensity of the illumination from said second illumination means with a second plurality of light detecting elements located along a second side of said dart board; detecting the presence of at least one shadow on said second plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart boards and calculating the location-of said dart embedded in said dart board from the detection of a shadow on said first plurality of light detecting elements and from the detection of a shadow on said second plurality of light detecting elements created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board.
Claim 19
Independent Claim
268 words
A method for locating a dart embedded in a dart board comprising the steps of: illuminating a space adjacent to the surface of the dart board in which the dart is embedded with a first illuminating means; monitoring the intensity of the illumination from said first illumination means within said illuminated space with a first plurality of light detecting elements located along a first side of said dart boardt detecting the presence of at least one shadow on said first plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart boards illuminating said space adjacent to the surface of the dart board in which the dart is embedded with a second illuminating means; monitoring the intensity of the illumination from said second illumination means with a second plurality of light detecting elements located along a second side of said dart board; detecting the presence of at least one shadow on said second plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart boards and calculating the location-of said dart embedded in said dart board from the detection of a shadow on said first plurality of light detecting elements and from the detection of a shadow on said second plurality of light detecting elements created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board.
Claim 20
Dependent Claim
187 words
A method as claimed in Claim 13 where the step of calculating the location of said dart embedded in said dart board from the detection of a shadow on said first plurality of light detecting elements and from the detection of a shadow on said second plurality of light detecting elements created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board comprises the steps of: transmitting the output of each of said first plurality of light detecting elements to a microprocessor; transmitting the output of each of said second plurality of light detecting elements to said microprocessor; identifying by said microprocessor which light detecting elements of said first plurality of light detecting elements and which light detecting elements of said second plurality of light detecting elements are detecting a reduced level of illumination indicative of the presence of a shadow on those particular light detecting elements; and calculating by said microprocessor the location of said dart embedded in said dart board from the shadow location information.
Claim 21
Independent Claim
373 words
A method for locating a dart embedded in a dart board comprising the steps of: illuminating a space adjacent to the surface of the dart board in which the dart is embedded with a first illuminating means; monitoring the intensity of the illumination from said first illumination means within said illuminated space with a first plurality of light detecting elements located along a first side of said dart board; detecting the presence of at least one shadow on said first plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart board; illuminating said space adjacent to the surface of the dart board in which the dart is embedded with a second illuminating means; monitoring the intensity of the illumination from said second illumination means with a second plurality of light detecting elements located along a second side of said dart board; detecting the presence of at least one shadow on said second plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart boards illuminating said space adjacent to the surface of the dart board in which the dart is embedded with a third illuminating means; monitoring the intensity of the illumination from said third illumination means with a third plurality of light detecting elements located along a third side of said dart board; detecting the presence of at least one shadow on said third plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart board; and calculating the location of said dart embedded in said dart board from the detection of a shadow on said first plurality of light detecting elements and from the detection of a shadow on said second plurality of light detecting elements and from the detection of a shadow on said third plurality of light detecting elements created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board.
Claim 22
Independent Claim
373 words
A method for locating a dart embedded in a dart board comprising the steps of: illuminating a space adjacent to the surface of the dart board in which the dart is embedded with a first illuminating means; monitoring the intensity of the illumination from said first illumination means within said illuminated space with a first plurality of light detecting elements located along a first side of said dart board; detecting the presence of at least one shadow on said first plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart board; illuminating said space adjacent to the surface of the dart board in which the dart is embedded with a second illuminating means; monitoring the intensity of the illumination from said second illumination means with a second plurality of light detecting elements located along a second side of said dart board; detecting the presence of at least one shadow on said second plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart boards illuminating said space adjacent to the surface of the dart board in which the dart is embedded with a third illuminating means; monitoring the intensity of the illumination from said third illumination means with a third plurality of light detecting elements located along a third side of said dart board; detecting the presence of at least one shadow on said third plurality of light detecting elements created by the presence of the dart within said illuminated space when said dart is embedded in said surface of said dart board; and calculating the location of said dart embedded in said dart board from the detection of a shadow on said first plurality of light detecting elements and from the detection of a shadow on said second plurality of light detecting elements and from the detection of a shadow on said third plurality of light detecting elements created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board.
Claim 23
Dependent Claim
231 words
A method as claimed in Claim 15 where the step of calculating the location of said dart embedded in said dart board from the detection of a shadow on said first plurality of light detecting elements and from the detection of a shadow on said second plurality of light detecting elements and from the detection of a shadow on said third plurality of light detecting elements created by the presence of a dart within said illuminated space adjacent to a surface of said dart board when said dart is embedded in said surface of said dart board comprises the steps of: transmitting the output of each of said first plurality of light detecting elements to a microprocessor; transmitting the output of each of said second plurality of light detecting elements to said microprocessor; transmitting the output of each of said third plurality of light detecting elements to said microprocessor identifying by said microprocessor which light detecting elements of said first plurality of light detecting elements and which light detecting elements of said second plurality of light detecting elements and which light detecting elements of said third plurality of light detecting elements are detecting a reduced level of illumination indicative of the presence of a shadow on those particular light detecting elements; and calculating by said microprocessor the location of said dart embedded in said dart board from the shadow location information.
Claim 24
Independent Claim
145 words
A method for automatically scoring a dart game comprising the steps of: illuminating a space adjacent to a surface of a dart board in which a dart is embedded: detecting the presence of at least two shadows created by the presence of the dart within said illuminated space adjacent to the surface of the dart board when said dart is embedded in said surface of said dart board; calculating the location of said dart embedded in said dart board from the detection of at least two shadows created by the presence of the dart within said illuminated space adjacent to the surface of the dart board when said dart is embedded in said surface of said dart board; and calculating automatically the score of said dart embedded in said surface of said dart board from the location of said dart embedded in said dart board.
Claim 25
Independent Claim
145 words
A method for automatically scoring a dart game comprising the steps of: illuminating a space adjacent to a surface of a dart board in which a dart is embedded: detecting the presence of at least two shadows created by the presence of the dart within said illuminated space adjacent to the surface of the dart board when said dart is embedded in said surface of said dart board; calculating the location of said dart embedded in said dart board from the detection of at least two shadows created by the presence of the dart within said illuminated space adjacent to the surface of the dart board when said dart is embedded in said surface of said dart board; and calculating automatically the score of said dart embedded in said surface of said dart board from the location of said dart embedded in said dart board.
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