Two-dimensional device array, two-dimensional surface light emitting laser array and image forming apparatus
First Claim
1. A two-dimensional device array comprising:
- devices having at least first electrodes and second electrodes and arranged in two dimensions in an elongated region with n devices in a longer side direction of the elongated region and m devices in a shorter side direction of the elongated region (where m<
n);
first wirings of n or more in number, each of the first wirings being connected to said first electrodes of m elements in maximum arranged in a first direction crossing said longer side direction, stretching in said first direction and arranged in said longer side direction; and
second wirings of n or more in number, each of the second wirings being connected to said second electrodes of m elements in maximum arranged in a second direction crossing said longer side direction and said first direction, stretching in said second direction and arranged in said longer side direction.
1 Assignment
0 Petitions
Accused Products
Abstract
Laser elements are arranged in two dimensions in an elongated region which is longer in the horizontal direction than in the vertical direction, wherein n laser elements are arranged in the horizontal direction, while m laser elements in the vertical direction, where n>m. The anode wiring extends to a direction which is inclined to the horizontal direction and the cathode wiring extends to another direction inclined to the horizontal direction, thereby the anode wiring and the cathode wiring crossing with each other. The anodes of m laser elements in maximum arranged in the direction of the anode wiring are connected to an anode wire, while the cathodes of m laser elements in maximum arranged in the cathode wiring are connected to a cathode wire. Accordingly, even if the array is longer in the horizontal direction and a large number of laser elements are aligned in the horizontal direction, the wiring resistance and electrostatic capacitance of each wire forming the oblique matrix wiring can be small and the operation delay of the laser element can also be small.
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Citations
21 Claims
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1. A two-dimensional device array comprising:
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devices having at least first electrodes and second electrodes and arranged in two dimensions in an elongated region with n devices in a longer side direction of the elongated region and m devices in a shorter side direction of the elongated region (where m<
n);first wirings of n or more in number, each of the first wirings being connected to said first electrodes of m elements in maximum arranged in a first direction crossing said longer side direction, stretching in said first direction and arranged in said longer side direction; and second wirings of n or more in number, each of the second wirings being connected to said second electrodes of m elements in maximum arranged in a second direction crossing said longer side direction and said first direction, stretching in said second direction and arranged in said longer side direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for driving a two-dimensional device array comprising:
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devices having at least first electrodes and second electrodes and arranged in two dimensions in an elongated region with n devices in a longer side direction of the elongated region and m devices in a shorter side direction of the elongated region (where m<
n);first wirings of n or more in number, each of the first wirings being connected to said first electrodes of m elements in maximum arranged in a first direction crossing said longer side direction, stretching in said first direction and arranged in said longer side direction; and second wirings of n or more in number, each of the second wirings being connected to said second electrodes of m elements in maximum arranged in a second direction crossing said longer side direction and said first direction, stretching in said second direction and arranged in said longer side direction, wherein said method comprises; impressing a drive voltage to one of said first wirings; simultaneously impressing a bias voltage to (m-1) of said first wirings on both sides of said one first wiring; and sequentially or simultaneously impressing a voltage to m of said second wirings which are crossing said one first wiring and connected to said second electrodes of m devices on said one first wiring, resulting in a voltage difference which is above a threshold voltage for operating said devices across said m devices connected to said one first wiring, and resulting in another voltage difference which is below the threshold voltage across the devices connected to (m-1) of said first wirings on both sides of said one first wiring.
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10. A method for driving a two-dimensional device array comprising:
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devices having at least first electrodes and second electrodes and arranged in two dimensions in an elongated region with n devices in a longer side direction of the elongated region and m devices in a shorter side direction of the elongated region (where m<
n);first wirings of n or more in number, each of the first wirings being connected to said first electrodes of m elements in maximum arranged in a first direction crossing said longer side direction, stretching in said first direction and arranged in said longer side direction; and second wirings of n or more in number, each of the second wirings being connected to said second electrodes of m elements in maximum arranged in a second direction crossing said longer side direction and said first direction, stretching in said second direction and arranged in said longer side direction, wherein said method comprises; simultaneously driving n/m or less of said first wirings separated by (m-1) or more wirings between each other; and simultaneously impressing a bias voltage to an undriven remainder of said first wirings.
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11. A two-dimensional surface light emitting laser array comprising:
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surface light emitting laser elements having at least first electrodes and second electrodes and arranged in two dimensions in an elongated rectangular region on a semiconductor substrate, with n laser elements in a longer side direction of the elongated rectangular region and m laser elements in a shorter side direction of the elongated rectangular region (where m<
n);first wirings of n or more in number, each of the first wirings being connected to said first electrodes of m elements in maximum arranged in a first direction crossing said longer side direction, stretching in said first direction and arranged in said longer side direction; and second wirings of n or more in number, each of the second wirings being connected to said second electrodes of m elements in maximum arranged in a second direction crossing said longer side direction and said first direction, stretching in said second direction and arranged in said longer side direction. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for driving a two-dimensional surface light emitting laser array comprising:
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surface light emitting laser elements having at least first electrodes and second electrodes and arranged in two dimensions in an elongated rectangular region on a semiconductor substrate, with n laser elements in a longer side direction and of the elongated rectangular region m laser elements in a shorter side direction of the elongated rectangular region (where m<
n);first wirings of n or more in number, each of the first wirings being connected to said first electrodes of m elements in maximum arranged in a first direction crossing said longer side direction, stretching in said first direction and arranged in said longer side direction; and second wirings of n or more in number, each of the second wirings being connected to said second electrodes of m elements in maximum arranged in a second direction crossing said longer side direction and first direction, stretching in said second direction and arranged in said longer side direction, wherein said method comprises; impressing a drive voltage to one of said first wirings; simultaneously impressing a bias voltage to (m-1) of said first wirings on both sides of said one first wiring; and sequentially or simultaneously impressing a voltage to m of said second wirings which are crossing said one first wiring and connected to said second electrodes of m lasers on said one first wiring, resulting in a voltage difference which is above a threshold voltage for operating said lasers across said m lasers connected to said one first wiring, and resulting in another voltage difference which is below the threshold voltage across the lasers connected to (m-1) of said first wirings on both sides of said one first wiring.
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19. A method for driving a two-dimensional surface light emitting laser array comprising:
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surface light emitting laser elements having at least first electrodes and second electrodes and arranged in two dimensions in an elongated rectangular region on a semiconductor substrate, with n laser elements in a longer side direction of the elongated rectangular region and m laser elements in a shorter side direction of the elongated rectangular region (where m<
n);first wirings of n or more in number, each of the first wirings being connected to said first electrodes of m elements in maximum arranged in a first direction crossing said longer side direction, stretching in said first direction and arranged in said longer side direction; and second wirings of n or more in number, each of the second wirings being connected to said second electrodes of m laser elements in maximum arranged in a second direction crossing said longer side direction and first direction, stretching in said second direction and arranged in said longer side direction, wherein said method comprises; simultaneously driving n/m or less of said first wirings separated by (m-1) or more wirings between each other; and simultaneously impressing a bias voltage to an undriven remainder of said first wirings.
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20. An image forming apparatus comprising:
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a two-dimensional surface light emitting laser array; a driving circuit for driving said two-dimensional surface light emitting laser array in a predetermined scanning pattern; and an optical system for irradiating a photosensitive material with laser beams from said two-dimensional surface light emitting laser array, wherein said two-dimensional surface light emitting laser array comprises; surface light emitting laser elements having at least first electrodes and second electrodes and arranged in two dimensions in an elongated rectangular region on a semiconductor substrate, with n laser elements in a longer side direction of the elongated rectangular region and m laser elements in a shorter side direction of the elongated rectangular region (where m<
n);first wirings of n or more in number, each of the first wirings being connected to said first electrodes of m elements in maximum arranged in a first direction crossing said longer side direction, stretching in said first direction and arranged in said longer side direction; and second wirings of n or more in number, each of the second wirings being connected to said second electrodes of m laser elements in maximum arranged in a second direction crossing said longer side direction and said first direction, stretching in said second direction and arranged in said longer side direction. - View Dependent Claims (21)
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Specification