Element matching device

Claim 1

A device for matching at least one desired element unit to a control unit comprising signal generating means, at least one control unit for determining said desired elements, said control unit providing visible control indicia and being generally impermeable to said signal, and providing at least one coded control array, each said control array determining at least one said desired element and providing at least one control aperture permeable to said signal; at least one element unit, generally impermeable to said signal, designating a single element, providing visible element indicia and a coded element array, and adapted to be used by disposing said element array in a fixed position and orientation for cooperation with a said control array, said control indicia and said element indicia remaining visible while said element unit is in use; alignment means for accurately positioning said element unit with respect to said control unit, said coded element array providing at least one element aperture permeable to said signal and adapted to cooperate with a said control aperture to form a coincident path permeable to said signal when said element unit is used, the said element apertures of a said element unit being disposed to form a unique coded pattern representing said designated single element; the said control apertures of a said control array being disposed to form a coded pattern adapted to correspond with at least one said unique pattern and thereby to at least one said desired element; means extending through said path for directing at least one said signal towards each said control array, and cooperating signal receiving and indicator means for receiving a said signal that has traversed at least one said continuous path, whereby, when a said element unit representing a said desired element is used, the said element aperture coded pattern corresponds with at least part of the cooperating said control aperture coded pattern to form at least one said continuous path, permitting a said signal to be received by said receiving means.

Claim 2

A device for matching at least one desired element unit to a control unit comprising signal generating means, at least one control unit for determining said desired elements, said control unit providing visible control indicia and being generally impermeable to said signal, and providing at least one coded control array, each said control array determining at least one said desired element and providing at least one control aperture permeable to said signal; at least one element unit, generally impermeable to said signal, designating a single element, providing visible element indicia and a coded element array, and adapted to be used by disposing said element array in a fixed position and orientation for cooperation with a said control array, said control indicia and said element indicia remaining visible while said element unit is in use; alignment means for accurately positioning said element unit with respect to said control unit, said coded element array providing at least one element aperture permeable to said signal and adapted to cooperate with a said control aperture to form a coincident path permeable to said signal when said element unit is used, the said element apertures of a said element unit being disposed to form a unique coded pattern representing said designated single element; the said control apertures of a said control array being disposed to form a coded pattern adapted to correspond with at least one said unique pattern and thereby to at least one said desired element; means extending through said path for directing at least one said signal towards each said control array, and cooperating signal receiving and indicator means for receiving a said signal that has traversed at least one said continuous path, whereby, when a said element unit representing a said desired element is used, the said element aperture coded pattern corresponds with at least part of the cooperating said control aperture coded pattern to form at least one said continuous path, permitting a said signal to be received by said receiving means.

Claim 11

A device for selecting desired elements from a set of possible elements and for arranging said selected elements in a desired sequence, comprising a non-conducting base, carrying a sequence of contact arrays, each said contact array providing at least two sets of electrical contacts, the contacts of each said set being electrically connected to each other but electrically insulated from the contacts of every other said set within each said contact array, and a said set in each said contact array being electrically connectable to a said set in each adjacent contact array in said sequence, a source of electrical potential connectable to a first said set of contacts in the first said contact array in said sequence of contact arrays, an electrically actuated indicator connectable between a last said set of contacts in the last said contact array in said sequence and said source of electrical potential, non-conducting support means, carrying at least one sequence of electrically conducting segments insulated from one another, each said contact being resiliently biassed towards a said conducting segment for normal engagement of a portion of said segment, a said conducting segment enabling electrical connection between two said insulated sets of contact points within a said contact array, and said conducting segments together enabling an electric circuit to be completed through said source of potential, said sequence of contact arrays, and said indicator, a removable non-conducting master card visibly designating said desired sequence of said desired elements and having a corresponding sequence of coded control arrays, said master card being adapted to be used by disposing each said control array adjacent a said contact array and at least one corresponding said conducting segment, said designation being visible while said master card is in use, each said coded control array providing not less than two apertures each disposed to enable engagement of a said conducting segment by a contact point when said master card is in use, a set of removable non-conducting element cards each visibly designating a single element in said set of possible elements and providing a coded element array, and adapted to be used by disposing said element array adjacent a said control array, said designation being visible while said element card is in use, said coded element array providing not less than two apertures each disposed to enable engagement of a said conducting segment by a contact point, each said element array having its said apertures disposed in a unique pattern representing said designated single element in said set of possible elements, and each said control array having its apertures disposed in a pattern identical to said unique pattern of one desired said element array, whereby, when said master card is in use, the use of a sequence of said element cards representing said desired sequence of elements, each said element card providing a said pattern of apertures identical with said pattern of apertures of each corresponding said control array, enables engagement of said conducting segments by said contact points and thereby enables said indicator to be actuated.

Claim 12

A device for selecting desired elements from a set of possible elements and for arranging said selected elements in a desired sequence, comprising a non-conducting base, carrying a sequence of contact arrays, each said contact array providing at least two sets of electrical contacts, the contacts of each said set being electrically connected to each other but electrically insulated from the contacts of every other said set within each said contact array, and a said set in each said contact array being electrically connectable to a said set in each adjacent contact array in said sequence, a source of electrical potential connectable to a first said set of contacts in the first said contact array in said sequence of contact arrays, an electrically actuated indicator connectable between a last said set of contacts in the last said contact array in said sequence and said source of electrical potential, non-conducting support means, carrying at least one sequence of electrically conducting segments insulated from one another, each said contact being resiliently biassed towards a said conducting segment for normal engagement of a portion of said segment, a said conducting segment enabling electrical connection between two said insulated sets of contact points within a said contact array, and said conducting segments together enabling an electric circuit to be completed through said source of potential, said sequence of contact arrays, and said indicator, a removable non-conducting master card visibly designating said desired sequence of said desired elements and having a corresponding sequence of coded control arrays, said master card being adapted to be used by disposing each said control array adjacent a said contact array and at least one corresponding said conducting segment, said designation being visible while said master card is in use, each said coded control array providing not less than two apertures each disposed to enable engagement of a said conducting segment by a contact point when said master card is in use, a set of removable non-conducting element cards each visibly designating a single element in said set of possible elements and providing a coded element array, and adapted to be used by disposing said element array adjacent a said control array, said designation being visible while said element card is in use, said coded element array providing not less than two apertures each disposed to enable engagement of a said conducting segment by a contact point, each said element array having its said apertures disposed in a unique pattern representing said designated single element in said set of possible elements, and each said control array having its apertures disposed in a pattern identical to said unique pattern of one desired said element array, whereby, when said master card is in use, the use of a sequence of said element cards representing said desired sequence of elements, each said element card providing a said pattern of apertures identical with said pattern of apertures of each corresponding said control array, enables engagement of said conducting segments by said contact points and thereby enables said indicator to be actuated.

Claim 15

A device for matching at least one desired element unit to a control unit comprising at least one control unit for determining said desired elements, said control unit providing visible control indicia, and providing at least one coded control array, each said control array determining at least one said desired element unit, a set of element units representing the set of letters in an alphabet, each said element unit representing a single said letter in said alphabet, and providing visible element indicia and a coded element array, said visible control indicia being visible letters representing a portion of a word spelled in said alphabet, and said visible element indicia being visible representations of said letters, and desired said letters being those that combine with said word portion to form a complete word spelled in said alphabet, alignment means for accurately positioning said element unit with respect to said control unit, means for directing at least one said signal towards each said control array, and cooperating signal receiving and indicator means, said means for directing said signal and said cooperating signal receiving means comprising a current source, a contact array, providing at least two sets of electrical contact points, the points of each set being electrically connected to each other but electrically insulated from the points of every other said set, said current sourCe being connected to a first said set of contact points, and said indicator being connected to a last said set of contact points, at least one electrically conducting segment, each said contact point being resiliently biassed towards a said conducting segment for normal engagement of a portion of said segment, each said segment normally providing electrical connection between two said insulated sets of contact points within a said contact array and normally enabling an electric circuit to be completed through said current source, said contact array, and said indicator, each said element unit being a non-conducting card, adapted to be used by disposing said coded element array adjacent a said coded control array, said element array providing an even number, not less than two, of element apertures, said element apertures being disposed to enable engagement of a said conducting segment by a contact point from each of at least two said sets of contact points within said contact array, the said element apertures of a said element unit being disposed to form a unique coded pattern representing said designated single element, said control unit being a non-conducting card, adapted to be used by disposing said control array between said contact array and said conducting segments, said control array providing an even number, not less than two, of control apertures, said control apertures being disposed to enable engagement of a said conducting segment by a contact point from each of at least two sets of contact points when said control card is in use, the said control apertures of a said control array being disposed to form a coded pattern adapted to correspond with at least one said unique pattern and thereby to at least one said desired element, whereby when said control card is used, the use of an element card representing a said desired letter provides a said element aperture pattern corresponding with at least part of said control aperture pattern and enables engagement of said conducting segments by said contact points, completing an electric circuit and causing said indicator to be actuated.

Claim 16

A device for matching at least one desired element unit to a control unit comprising at least one control unit for determining said desired elements, said control unit providing visible control indicia, and providing at least one coded control array, each said control array determining at least one said desired element unit, a set of element units representing the set of letters in an alphabet, each said element unit representing a single said letter in said alphabet, and providing visible element indicia and a coded element array, said visible control indicia being visible letters representing a portion of a word spelled in said alphabet, and said visible element indicia being visible representations of said letters, and desired said letters being those that combine with said word portion to form a complete word spelled in said alphabet, alignment means for accurately positioning said element unit with respect to said control unit, means for directing at least one said signal towards each said control array, and cooperating signal receiving and indicator means, said means for directing said signal and said cooperating signal receiving means comprising a current source, a contact array, providing at least two sets of electrical contact points, the points of each set being electrically connected to each other but electrically insulated from the points of every other said set, said current sourCe being connected to a first said set of contact points, and said indicator being connected to a last said set of contact points, at least one electrically conducting segment, each said contact point being resiliently biassed towards a said conducting segment for normal engagement of a portion of said segment, each said segment normally providing electrical connection between two said insulated sets of contact points within a said contact array and normally enabling an electric circuit to be completed through said current source, said contact array, and said indicator, each said element unit being a non-conducting card, adapted to be used by disposing said coded element array adjacent a said coded control array, said element array providing an even number, not less than two, of element apertures, said element apertures being disposed to enable engagement of a said conducting segment by a contact point from each of at least two said sets of contact points within said contact array, the said element apertures of a said element unit being disposed to form a unique coded pattern representing said designated single element, said control unit being a non-conducting card, adapted to be used by disposing said control array between said contact array and said conducting segments, said control array providing an even number, not less than two, of control apertures, said control apertures being disposed to enable engagement of a said conducting segment by a contact point from each of at least two sets of contact points when said control card is in use, the said control apertures of a said control array being disposed to form a coded pattern adapted to correspond with at least one said unique pattern and thereby to at least one said desired element, whereby when said control card is used, the use of an element card representing a said desired letter provides a said element aperture pattern corresponding with at least part of said control aperture pattern and enables engagement of said conducting segments by said contact points, completing an electric circuit and causing said indicator to be actuated.

Claim 17

A device for matching at least one desired element unit to a control unit comprising at least one control unit for determining said desired elements, said control unit providing visible control indicia and providing at least one coded control array, each said control array determining at least one said desired element unit, a set of element units representing the set of letters in an alphabet, each said element unit representing a single said letter in said alphabet, and providing visible element indicia and a coded element array, said visible control indicia representing a word to be spelled in said alphabet, said visible element indicia being visible representations of said letters, and desired said letters being those that combine to form the complete word designated by said control indicia spelled in said alphabet, alignment means for accurately positioning a said element unit with respect to said control unit, means for directing at least one said signal towards each said control array, and cooperating signal receiving and indicator means, said means for directing said signal and said cooperating signal receiving means comprising a current source, a contact array, providing at least two sets of electrical contact points, the points of each said set being electrically connected to each other but electrically insulated from the points of every other said set, said current source being connectable to a first said set of contact points, and said indicator being connectable to a last said set of contact points, at least one electrically conducting segment, each said contact point being resiliently biased towards a said conducting segment for normal engagement of a portion of said segment, a said segment normally providing electrical connection between the two said insulated sets of coNtact points within a said contact array, each said element unit being a non-conducting card, adapted to be used by disposing said coded element array adjacent a said coded control array, said element array providing not less than two element apertures, said element apertures being disposed to enable engagement of a said conducting segment by a contact point from each of the two said sets of contact points within said contact array, the said element apertures of a said element unit being disposed to form a unique coded pattern representing said designated single element, said control unit being a non-conducting card, adapted to be used by disposing said control array between said contact array and said conducting segments, said control array providing not less than two control apertures, said control apertures being disposed to enable engagement of a said conducting segment by a contact point from each of two sets of contact points when said control card is in use, the said control apertures of a said control array being disposed to form a coded pattern adapted to correspond with at least one said unique pattern and thereby to at least one said desired element, whereby when said control card is used, the use of an element card representing a said desired letter provides a said element aperture pattern corresponding with at least part of said control aperture pattern and enables engagement of said conducting segments by said contact points, completing an electric circuit and causing said indicator to be actuated.

Claim 18

A device for matching at least one desired element unit to a control unit comprising at least one control unit for determining said desired elements, said control unit providing visible control indicia and providing at least one coded control array, each said control array determining at least one said desired element unit, a set of element units representing the set of letters in an alphabet, each said element unit representing a single said letter in said alphabet, and providing visible element indicia and a coded element array, said visible control indicia representing a word to be spelled in said alphabet, said visible element indicia being visible representations of said letters, and desired said letters being those that combine to form the complete word designated by said control indicia spelled in said alphabet, alignment means for accurately positioning a said element unit with respect to said control unit, means for directing at least one said signal towards each said control array, and cooperating signal receiving and indicator means, said means for directing said signal and said cooperating signal receiving means comprising a current source, a contact array, providing at least two sets of electrical contact points, the points of each said set being electrically connected to each other but electrically insulated from the points of every other said set, said current source being connectable to a first said set of contact points, and said indicator being connectable to a last said set of contact points, at least one electrically conducting segment, each said contact point being resiliently biased towards a said conducting segment for normal engagement of a portion of said segment, a said segment normally providing electrical connection between the two said insulated sets of coNtact points within a said contact array, each said element unit being a non-conducting card, adapted to be used by disposing said coded element array adjacent a said coded control array, said element array providing not less than two element apertures, said element apertures being disposed to enable engagement of a said conducting segment by a contact point from each of the two said sets of contact points within said contact array, the said element apertures of a said element unit being disposed to form a unique coded pattern representing said designated single element, said control unit being a non-conducting card, adapted to be used by disposing said control array between said contact array and said conducting segments, said control array providing not less than two control apertures, said control apertures being disposed to enable engagement of a said conducting segment by a contact point from each of two sets of contact points when said control card is in use, the said control apertures of a said control array being disposed to form a coded pattern adapted to correspond with at least one said unique pattern and thereby to at least one said desired element, whereby when said control card is used, the use of an element card representing a said desired letter provides a said element aperture pattern corresponding with at least part of said control aperture pattern and enables engagement of said conducting segments by said contact points, completing an electric circuit and causing said indicator to be actuated.

Claim 19

A device for matching at least one desired element unit to a control unit comprising signal-directing means and cooperating signal receiving means comprising at least one extended light source and at least one cooperating light receiving device, at least one control unit for determining said desired element units, said control unit being a generally opaque card providing visible control indicia, and providing at least one coded control array, each said control array determining at least one said desired element unit and providing at least one control aperture transparent to visible light, said visible control indicia representing a word to be spelled, a set of said element units representing the set of letters in an alphabet and providing visible representations of said letters, and desired said letters being those that combine with said word portion to form a complete word spelled in said alphabet, each said element unit representing a single said letter in said alphabet, and being a generally opaque card providing a coded element array, and adapted to be used by disposing said element array adjacent a said control array, said control indicia and said element indicia remaining visible while said element unit is in use, said coded element array providing at least one elemnt aperture transparent to visible light and adapted to cooperate with a said control aperture to form a continuous path permeable to said light when said element unit is used, the said element apertures of a said element unit being disposed to form a unique coded pattern representing said designated single element, the said control apertures of a said control array being disposed to form a coded pattern adapted to correspond with at least one said unique pattern and thereby to at least one said desired element, alignment means for accurately positioning said element unit with respect to said control unit, whereby, when a said element unit representing a said desired element is used, the said element aperture coded pattern corresponds with at least part of the cooperating said control aperture coded pattern to form at least one continuous path, permitting a said light signal to be received by said light receiving device.

Claim 20

A device for matching at least one desired element unit to a control unit comprising signal-directing means and cooperating signal receiving means comprising at least one extended light source and at least one cooperating light receiving device, at least one control unit for determining said desired element units, said control unit being a generally opaque card providing visible control indicia, and providing at least one coded control array, each said control array determining at least one said desired element unit and providing at least one control aperture transparent to visible light, said visible control indicia representing a word to be spelled, a set of said element units representing the set of letters in an alphabet and providing visible representations of said letters, and desired said letters being those that combine with said word portion to form a complete word spelled in said alphabet, each said element unit representing a single said letter in said alphabet, and being a generally opaque card providing a coded element array, and adapted to be used by disposing said element array adjacent a said control array, said control indicia and said element indicia remaining visible while said element unit is in use, said coded element array providing at least one elemnt aperture transparent to visible light and adapted to cooperate with a said control aperture to form a continuous path permeable to said light when said element unit is used, the said element apertures of a said element unit being disposed to form a unique coded pattern representing said designated single element, the said control apertures of a said control array being disposed to form a coded pattern adapted to correspond with at least one said unique pattern and thereby to at least one said desired element, alignment means for accurately positioning said element unit with respect to said control unit, whereby, when a said element unit representing a said desired element is used, the said element aperture coded pattern corresponds with at least part of the cooperating said control aperture coded pattern to form at least one continuous path, permitting a said light signal to be received by said light receiving device.

Claim 21

A device for matching a desired sequence of element units to a control unit comprising signal current generating means, signal current directing means and cooperating signal current receiving and indicator means, at least one control unit for determining said desired sequence of said element units, said control unit being generally non-conductive, and providing visible representation of a word to be spelled and a sequence of control arrays, each said control array determining a single desired element unit in said desired sequence, a set of element units representing the set of letters in an alphabet, each said element unit being generally non-conductive and providing a coded element array and visibly designating a single said letter in said alphabet, alignment means for accurately positioning said element unit with respect to said control unit, said signal current directing means and cooperating receiving means comprising a sequence of contact arrays, each said contact array providing at least two sets of electrical contact points, the points of each said set being electrically connected to each other but electrically insulated from the points of every other said set within each said contact array, and each said contact array being electrically connectable to a said set in each adjacent contact array in said sequence, said current generating means being connectable to a first said set of contact points in the first said control array in said sequence, and said indicator means being connectable to a last said set in the last said control array in said sequence, at least one sequence of electrically conducting segments insulated from one another, resilient support means for each said contact point, biassing said point towards a said conducting segment for normal engagement of a portion of said segment, a said conducting segment enabling electrical connection between two said insulated sets of contact points within a said contact array, and said conducting segments together enabling an electric circuit to be completed through said current generating means, said sequence of contact arrays, and said indicating means, each said control unit being adapted to be used by disposing each said control array adjacent a said contact array and at least one corresponding said conducting segment, each said control array providing not less than two apertures each disposed to enable engagement of a said conducting segment by a contact point when said control card is in use, each said element unit being adapted to be used by disposing said element array adjacent a said controlling array, said representation of a word and said designated letter remaining visible while said element unit is so used, and providing not less than two apertures each disposed to enable engagement of a said conducting segment by a contact point when said element is in use, the said apertures being disposed to form a unique coded pattern corresponding to said designated single letter element, and the said apertures of a said control array being disposed to form a coded pattern corresponding with at least one said element array, whereby, when a said control unit is in use, the use of a sequence of element units each representing a desired said letter provides a sequence of said letter aperture patterns corresponding with said sequence of control aperture patterns and enables engagement of said conducting segments by said contact points, completing said electric circuit and actuating said indicator means.

Claim 22

A device for matching a desired sequence of element units to a control unit comprising signal current generating means, signal current directing means and cooperating signal current receiving and indicator means, at least one control unit for determining said desired sequence of said element units, said control unit being generally non-conductive, and providing visible representation of a word to be spelled and a sequence of control arrays, each said control array determining a single desired element unit in said desired sequence, a set of element units representing the set of letters in an alphabet, each said element unit being generally non-conductive and providing a coded element array and visibly designating a single said letter in said alphabet, alignment means for accurately positioning said element unit with respect to said control unit, said signal current directing means and cooperating receiving means comprising a sequence of contact arrays, each said contact array providing at least two sets of electrical contact points, the points of each said set being electrically connected to each other but electrically insulated from the points of every other said set within each said contact array, and each said contact array being electrically connectable to a said set in each adjacent contact array in said sequence, said current generating means being connectable to a first said set of contact points in the first said control array in said sequence, and said indicator means being connectable to a last said set in the last said control array in said sequence, at least one sequence of electrically conducting segments insulated from one another, resilient support means for each said contact point, biassing said point towards a said conducting segment for normal engagement of a portion of said segment, a said conducting segment enabling electrical connection between two said insulated sets of contact points within a said contact array, and said conducting segments together enabling an electric circuit to be completed through said current generating means, said sequence of contact arrays, and said indicating means, each said control unit being adapted to be used by disposing each said control array adjacent a said contact array and at least one corresponding said conducting segment, each said control array providing not less than two apertures each disposed to enable engagement of a said conducting segment by a contact point when said control card is in use, each said element unit being adapted to be used by disposing said element array adjacent a said controlling array, said representation of a word and said designated letter remaining visible while said element unit is so used, and providing not less than two apertures each disposed to enable engagement of a said conducting segment by a contact point when said element is in use, the said apertures being disposed to form a unique coded pattern corresponding to said designated single letter element, and the said apertures of a said control array being disposed to form a coded pattern corresponding with at least one said element array, whereby, when a said control unit is in use, the use of a sequence of element units each representing a desired said letter provides a sequence of said letter aperture patterns corresponding with said sequence of control aperture patterns and enables engagement of said conducting segments by said contact points, completing said electric circuit and actuating said indicator means.

Claim 23

A device for matching a sequence of desired letters to a control word unit designating a word, comprising signal light generating means, at least one control word unit for determining said sequence of desired letters, said control word unit providing visible representation of said word and being generally opaque and providing a sequence of coded control arrays, each said control array determining a single desired letter and providing at least one control area transparent said signal light, a set of letter units, representing the letters of an alphabet, generally opaque, each said letter unit designating a single letter, providing visible representation of said letter and a coded letter array, and adapted to be used by disposing said letter array adjacent a said control array, said word representation and said letter representation remaining visible while said letter unit is in use, alignment means for accurately positioning said letter unit with respect to said control word unit, said coded letter array providing at least one letter area transparent to said signal light and adapted to cooperate with a said control area to form a continuous path transparent to said signal light when said letter unit is used, the said letter areas of a said letter unit being disposed to form a unique coded pattern representing said designated single letter, the said control areas of a said control array being disposed to form a coded pattern adapted to corespond with at least one said unique pattern and thereby to at least one said desired letter, signal directing means and cooperating signal receiving means comprising a sequence of transmitter-receiver units, each said unit corresponding with a said control array when said control unit is in use, and each said unit comprising at least one extended light source disposed to direct said visible light toward at least a portion of a said corresponding control array, and at least one cooperating light receiving device, whereby, when a said letter unit representing a said desired letter is used, the said letter area coded pattern corresponds with at least part of the cooperating said control area coded pattern to form at least one continuous path for said signal light, permitting a said signal to be received by said receiving means.

Claim 24

A device for matching a sequence of desired letters to a control word unit designating a word, comprising signal light generating means, at least one control word unit for determining said sequence of desired letters, said control word unit providing visible representation of said word and being generally opaque and providing a sequence of coded control arrays, each said control array determining a single desired letter and providing at least one control area transparent said signal light, a set of letter units, representing the letters of an alphabet, generally opaque, each said letter unit designating a single letter, providing visible representation of said letter and a coded letter array, and adapted to be used by disposing said letter array adjacent a said control array, said word representation and said letter representation remaining visible while said letter unit is in use, alignment means for accurately positioning said letter unit with respect to said control word unit, said coded letter array providing at least one letter area transparent to said signal light and adapted to cooperate with a said control area to form a continuous path transparent to said signal light when said letter unit is used, the said letter areas of a said letter unit being disposed to form a unique coded pattern representing said designated single letter, the said control areas of a said control array being disposed to form a coded pattern adapted to corespond with at least one said unique pattern and thereby to at least one said desired letter, signal directing means and cooperating signal receiving means comprising a sequence of transmitter-receiver units, each said unit corresponding with a said control array when said control unit is in use, and each said unit comprising at least one extended light source disposed to direct said visible light toward at least a portion of a said corresponding control array, and at least one cooperating light receiving device, whereby, when a said letter unit representing a said desired letter is used, the said letter area coded pattern corresponds with at least part of the cooperating said control area coded pattern to form at least one continuous path for said signal light, permitting a said signal to be received by said receiving means.