Fingerprint image input apparatus
First Claim
1. A fingerprint image input apparatus comprising:
- a plane light source for irradiating light having a two-dimensional light distribution and an approximately even luminance;
a two-dimensional image sensor capable of allowing said light to pass through, said two-dimensional image sensor including,a plurality of pixels arranged in a matrix form, each pixel havinga photoelectric converting element for outputting a photoelectric signal in response to incident light, anda switch element for transferring said photoelectric signal as a photoelectric data signal;
bias lines for applying a bias voltage to said photoelectric converting elements, said bias lines being connected to said pixels;
scan lines for transferring a scan signal to said switch elements, said scan lines being connected to said pixels;
data lines for transferring photoelectric data signals from said switch elements, said data lines being connected to said pixels;
a bias power source for supplying said bias voltage;
a scanning circuit for outputting said scan signal;
a first detecting circuit for detecting said photoelectric data signal;
a signal generator for generating a finger detection signal to detect contact of a finger with said two-dimensional image sensor;
a second detecting circuit for detecting a change in said finger detection signal;
a switch controller for outputting a control signal in accordance with a finger detection mode and a fingerprint image input mode;
a first switch circuit for controlling connection between said bias lines and said second detecting circuit or said bias power source in accordance with said control signal; and
a second switch circuit for controlling connection between said signal generator and said bias lines in accordance with said control signal; and
an optical part for guiding light from said plane light source, having passed said two-dimensional image sensor, to a finger and guiding light reflected at said finger to said photoelectric converting element.
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Accused Products
Abstract
A fingerprint image input apparatus comprises a plane light source for irradiating light having a two-dimensional light distribution and an approximately even luminance, a two-dimensional image sensor capable of allowing the light to pass through, and an optical part for guiding light from the plane light source, having passed the two-dimensional image sensor, to a finger and guiding light reflected at the finger to the photoelectric converting element. The two-dimensional image sensor includes a plurality of pixels arranged in a matrix form. A bias power source for supplying a bias voltage to the individual pixels, a scanning circuit for outputting a scan signal to the pixels and a first detecting circuit for detecting photoelectric data signals from the pixels are connected to those pixels via bias lines, scan lines and data lines. Connected to the bias lines are a signal generator for generating a finger detection signal to detect the contact of a finger with the optical part and a signal detecting circuit for detecting a change in the finger detection signal. A switch controller outputs a control signal in accordance with a finger detection mode and a fingerprint image input mode. According to the control signal, first and second switch circuits control the connection between the signal generator and the second detecting circuit.
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Citations
7 Claims
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1. A fingerprint image input apparatus comprising:
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a plane light source for irradiating light having a two-dimensional light distribution and an approximately even luminance; a two-dimensional image sensor capable of allowing said light to pass through, said two-dimensional image sensor including, a plurality of pixels arranged in a matrix form, each pixel having a photoelectric converting element for outputting a photoelectric signal in response to incident light, and a switch element for transferring said photoelectric signal as a photoelectric data signal; bias lines for applying a bias voltage to said photoelectric converting elements, said bias lines being connected to said pixels; scan lines for transferring a scan signal to said switch elements, said scan lines being connected to said pixels; data lines for transferring photoelectric data signals from said switch elements, said data lines being connected to said pixels; a bias power source for supplying said bias voltage; a scanning circuit for outputting said scan signal; a first detecting circuit for detecting said photoelectric data signal; a signal generator for generating a finger detection signal to detect contact of a finger with said two-dimensional image sensor; a second detecting circuit for detecting a change in said finger detection signal; a switch controller for outputting a control signal in accordance with a finger detection mode and a fingerprint image input mode; a first switch circuit for controlling connection between said bias lines and said second detecting circuit or said bias power source in accordance with said control signal; and a second switch circuit for controlling connection between said signal generator and said bias lines in accordance with said control signal; and an optical part for guiding light from said plane light source, having passed said two-dimensional image sensor, to a finger and guiding light reflected at said finger to said photoelectric converting element. - View Dependent Claims (2)
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3. A fingerprint image input apparatus comprising:
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a plane light source for irradiating light having a two-dimensional light distribution and an approximately even luminance; a two-dimensional image sensor capable of allowing said light to pass through, said two-dimensional image sensor including, a plurality of pixels arranged in a matrix form, each pixel having a photoelectric converting element for outputting a photoelectric signal in response to incident light, and a switch element for transferring said photoelectric signal as a photoelectric data signal; bias lines for applying a bias voltage to said photoelectric converting elements, said bias lines being connected to said pixels; scan lines for transferring a scan signal to said switch elements, said scan lines being connected to said pixels; data lines for transferring photoelectric data signals from said switch elements, said data lines being connected to said pixels; a bias power source for supplying said bias voltage; a scanning circuit for outputting said scan signal; a first detecting circuit for detecting said photoelectric data signal; a generator for generating a finger detection signal to detect contact of a finger with said two-dimensional image sensor; a second detecting circuit for detecting a change in said finger detection signal; a switch controller for outputting a control signal in accordance with a finger detection mode and a fingerprint image input mode; a first switch circuit for controlling connection between said scan lines and said second detecting circuit in accordance with said control signal; and a second switch circuit for controlling connection between said signal generator or said scanning circuit and said scan lines in accordance with said control signal; and an optical part for guiding light from said plane light source, having passed said two-dimensional image sensor, to a finger and guiding light reflected at said finger to said photoelectric converting element. - View Dependent Claims (4, 5)
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6. A fingerprint image input apparatus comprising:
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a plane light source for irradiating light having a two-dimensional light distribution and an approximately even luminance; a two-dimensional image sensor capable of allowing said light to pass through, said two-dimensional image sensor including, a plurality of pixels arranged in a matrix form, each pixel having a photoelectric converting element for outputting a photoelectric signal in response to incident light, and a switch element for transferring said photoelectric signal as a photoelectric data signal; bias lines for applying a bias voltage to said photoelectric converting elements, said bias lines being connected to said pixels; scan lines for transferring a scan signal to said switch elements, said scan lines being connected to said pixels; data lines for transferring photoelectric data signals from said switch elements, said data lines being connected to said pixels; a bias power source for supplying said bias voltage; a scanning circuit for outputting said scan signal; a first detecting circuit for detecting said photoelectric data signal; a signal generator for generating a finger detection signal to detect contact of a finger with said two-dimensional image sensor; a second detecting circuit for detecting a change in said finger detection signal; a switch controller for outputting a control signal in accordance with a finger detection mode and a fingerprint image input mode; a first switch circuit for controlling connection between said data lines and said second detecting circuit in accordance with said control signal; and a second switch circuit for controlling connection between said signal generator or said first detecting circuit and said data lines in accordance with said control signal; and an optical part for guiding light from said plane light source, having passed said two-dimensional image sensor, to a finger and guiding light reflected at said finger to said photoelectric converting element. - View Dependent Claims (7)
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Specification