摘要:
The present invention is adapted to form a finger table for supporting and locating a finger to be authenticated by touching the front part of the finger in a case, make the case closed at parts corresponding to the tip and the base of the finger to be authenticated and parts corresponding to left and right sides of the finger, make the case opened at parts corresponding to the front part and the backside of the finger, and form an imaging range of imaging means such as an imaging element in the parts corresponding to the left and right sides of the finger. With the configuration, a finger vein pattern inputting device with high operability and authentication accuracy reserved is provided.
摘要:
The present invention is adapted to form a finger table for supporting and locating a finger to be authenticated by touching the front part of the finger in a case, make the case closed at parts corresponding to the tip and the base of the finger to be authenticated and parts corresponding to left and right sides of the finger, make the case opened at parts corresponding to the front part and the backside of the finger, and form an imaging range of imaging means such as an imaging element in the parts corresponding to the left and right sides of the finger. With the configuration, a finger vein pattern inputting device with high operability and authentication accuracy reserved is provided.
摘要:
Within a finger vein authentication input apparatus, a finger positioning portion comprises a fingertip projection portion provided at a position corresponding to the tip of the finger when picking up an image thereof, protruding into the horizontal direction, soas to be in contact with a tip of a finger, horizontally, a finger pulp projection portion provided at the position corresponding to the tip of the finger when picking up the image thereof, protruding into the vertical direction, so as to be in contact with the tip of the finger, vertically, and a base guide portion provided at the position corresponding to the base side than a second joint of the finger when picking up the image thereof, having a configuration curved along the cross-section configuration of the finger, or a curved configuration including a projection portion at a center thereof, thereby increasing an accuracy of positioning the finger in the longitudinal direction thereof, and further lowering shift of angle of attaching the finger in the longitudinal direction thereof.
摘要:
There is a need for providing a finger vein image inputting device that can miniaturize and thin a finger vein authentication apparatus and provide high authentication accuracy. The finger vein image inputting device according to the present invention includes a body, a band pass filter for transmitting only light of a specific wavelength, a light source for applying light to a finger placed over the band pass filter, and an imaging means for imaging transmitted light from the finger. A gradient index lens is provided between the band pass filter and the imaging means and causes refractive-index distribution around an optical axis. A polarizing filter is provided at least one of between the light source and the finger and between the finger and an imaging device.
摘要:
A personal authentication apparatus, being small/thin and also enabling to position a vital body with high accuracy, comprises: a first light source and a second light source, each of which is configured to irradiate infrared rays; and detector portion, which is configured to detect the infrared rays irradiated from the first and second light sources upon a vital body, whereby detecting a picture having characteristic information of the vital body from the infrared rays detected by the detector portion and executing a personal authentication, wherein irradiation is made from the first and second light sources upon the vital body, and position information of the vital body is detected from the infrared rays detected by the detector portion, thereby executing non-contacting positioning of the vital body.
摘要:
An electronic component for high frequency power amplification realizes an improvement in switching spectrum characteristics. The gain of an amplifying NMOS transistor is controlled by a bias voltage on which a bias control voltage is reflected. Further, a threshold voltage compensator compensates for a variation in threshold voltage with variations in the manufacture of the amplifying NMOS transistor. The threshold voltage compensator includes an NMOS transistor formed in the same process specification as the amplifying NMOS transistor and converts a variation in current flowing through the NMOS transistor depending on the variation in the threshold voltage of the amplifying NMOS transistor to its corresponding voltage by a resistor to compensate for the bias voltage. It is thus possible to reduce variations in so-called precharge level brought to fixed output power in a region (0 dBm or less, for example) low in output power.
摘要:
This invention provides an electronic part for high frequency power amplification (RF power module) which will automatically perform the precharge level setting for proper output power at start of transmission without requiring the software process for precharging to run on the baseband IC, which can reduce the burden on users, namely, mobile phone manufacturers. Such electronic part configured to amplify RF transmit signals includes an output power control circuit which supplies an output power control voltage to a bias control circuit in a high frequency power amplifier circuit, based on an output power level directive signal. This electronic part is equipped with a precharge circuit which raises the output power control voltage to produce a predetermined level of output power, while detecting a current flowing through a final-stage power amplifying element, triggered by rise of a supply voltage at start of transmission.
摘要:
This invention provides an electronic part for high frequency power amplification (RF power module) which will automatically perform the precharge level setting for proper output power at start of transmission without requiring the software process for precharging to run on the baseband IC, which can reduce the burden on users, namely, mobile phone manufacturers. Such electronic part configured to amplify RF transmit signals includes an output power control circuit which supplies an output power control voltage to a bias control circuit in a high frequency power amplifier circuit, based on an output power level directive signal. This electronic part is equipped with a precharge circuit which raises the output power control voltage to produce a predetermined level of output power, while detecting a current flowing through a final-stage power amplifying element, triggered by rise of a supply voltage at start of transmission.
摘要:
Part of a first signal path for amplifying a signal includes circuits for detecting a signal, and a second signal path connected to an input portion of the first signal path includes circuits for detecting the signal. A signal strength detector circuit adds outputs from the respective detector circuits in the first and second signal paths. The first signal path has a function of expanding the dynamic range in a smaller signal region as compared with the second signal path, while the second signal path has a function of expanding the dynamic range in a larger signal region as compared with the first signal path. When a radio transmitted output is variably controlled in a radio transmitter section based on a field strength detection output for a received signal, the transmitted output is optimized, resulting in minimizing consumed power and unnecessary radiation of radio waves.
摘要:
In a high frequency power amplifier circuit in which bias voltages are applied to the transistors for amplification by current mirroring, The power amplifier includes a detection circuit including a transistor for detection which receives the AC component of an input signal to the last-stage transistor for amplification at its control terminal, a current mirror circuit which mirrors current flowing through that transistor, and a current-voltage converter which converts current flowing in the slave side of the current mirror circuit into a voltage. In the detection circuit, a voltage from a bias circuit for generating the bias voltages for the transistors for amplification is applied to the control terminal of the transistor for detections, and output of the detection circuit is applied to the control terminal of the last-stage transistor for amplification.