Document photosensor of surface-mounted elements

A document photosensor comprising:

• an upper sensor assembly disposed on one side of a passageway along which a document is transported and
• a lower sensor assembly disposed on the opposite side of the passageway from the upper sensor assembly,
• wherein the upper sensor assembly comprises an upper substrate, an upper light emitting element surface-mounted on the upper substrate and an upper light receiving element surface-mounted on the upper substrate,
• the lower sensor assembly comprises a lower substrate, a lower light emitting element surface-mounted on the lower substrate and a lower light receiving element surface-mounted on the lower substrate,
• the upper light receiving element receives a light that is irradiated from the lower light emitting element and then penetrates the document moved along the passageway, and
• the lower light receiving element receives another light that is irradiated from the upper light emitting element and then penetrates the document moved along the passageway.

A document photosensor comprising:

• an upper sensor assembly disposed on one side of a passageway along which a document is transported and
• a lower sensor assembly disposed on the opposite side of the passageway from the upper sensor assembly,
• wherein the upper sensor assembly comprises an upper substrate, first and second upper light emitting elements surface-mounted on the upper substrate and
• an upper light receiving element surface-mounted on the upper substrate,
• the lower sensor assembly comprises a lower substrate, first and second lower light emitting elements surface-mounted on the lower substrate and
• a lower light receiving element surface-mounted on the lower substrate,
• the upper light receiving element receives lights that are irradiated from the first and second lower light emitting element and then penetrate the document moved along the passageway, and
• the lower light receiving element receives lights that are irradiated from the first and second upper light emitting elements and then penetrate the document moved along the passageway.

A document photosensor comprising:

• an upper sensor assembly disposed on one side of a passageway along which a document is transported and
• a lower sensor assembly disposed on the opposite side of the passageway from the upper sensor assembly,
• wherein the upper sensor assembly comprises an upper substrate, first to third upper light emitting elements individually surface-mounted on the upper substrate and an upper light receiving element surface-mounted on the upper substrate,
• the lower sensor assembly comprises a lower substrate, first to third lower light emitting elements individually surface-mounted on the lower substrate and a lower light receiving element surface-mounted on the lower substrate,
• the upper light receiving element receives lights that are irradiated from the first to third lower light emitting element and then penetrate the document moved along the passageway, and
• the lower light receiving element receives lights that are irradiated from the first to third upper light emitting element and then penetrate the document moved along the passageway.

A document photosensor comprising:

• an upper sensor assembly disposed on one side of a passageway along which a document is transported and
• a lower sensor assembly disposed on the opposite side of the passageway from the upper sensor assembly,
• wherein the upper sensor assembly comprises an upper substrate, first to fourth upper light emitting elements individually surface-mounted on the upper substrate and an upper light receiving element surface-mounted on the upper substrate,
• the lower sensor assembly comprises a lower substrate, first to fourth lower light emitting elements individually surface-mounted on the lower substrate and a lower light receiving element surface-mounted on the lower substrate,
• the upper light receiving element receives lights that are irradiated from the first to fourth lower light emitting element and then penetrate the document moved along the passageway, and
• the lower light receiving element receives lights that are irradiated from the first to fourth upper light emitting element and then penetrate the document moved along the passageway.

A document photosensor comprising:

• an upper sensor assembly disposed on one side of a passageway along which a document is transported and
• a lower sensor assembly disposed on the opposite side of the passageway from the upper sensor assembly,
• wherein the upper sensor assembly comprises an upper substrate, first to fourth upper light emitting elements individually surface-mounted on the upper substrate and an upper light receiving element surface-mounted on the upper substrate,
• the lower sensor assembly comprises a lower substrate, first to fourth lower light emitting elements individually surface-mounted on the lower substrate and a lower light receiving element surface-mounted on the lower substrate,
• the upper light receiving element receives lights that are irradiated from the first to third lower light emitting elements and then penetrate the document moved along the passageway,
• the upper light receiving element also receives a light that is irradiated from the fourth upper light emitting element and then reflected on the document moved along the passageway,
• the lower light receiving element receives lights that are irradiated from the first, second, and third upper light emitting element and then penetrate the document moved along the passageway, and
• the lower light receiving element also receives a light that is irradiated from the fourth lower light emitting element and then reflected on the document moved along the passageway.

A document photosensor comprising:

• a substrate that has a plurality of emission and acceptance electrodes,
• at least first and second light emitting elements each having two terminals each surface-mounted on the same or different emission electrode on the substrate,
• a light receiving element having two terminals,
• a bracket disposed on the substrate,
• a first aspheric lens supported on the bracket opposite to the first and second light emitting elements,
• a second aspheric lens disposed opposite to the light receiving element, and
• a light diffusion chamber formed between the first and second light emitting elements and the first aspheric lens.