摘要:
Apparatus for optically reading printed information by radiating light onto printed information to be reflected thereby, receiving the reflected light through an optical system and converting the image of the reflected light into a corresponding electric signal. The light source employs red light emitting diodes which radiate highly bright red light having a wavelength peak at about 660 nm so that the image sensor can receive a highly contrasting reflected light from the information printed in black on a white base. The light source further or alternatively employs infrared light emitting diodes for radiating the light having a peak wavelength at about 925 nm so that the image sensor can also received a highly contrasting reflected light from information printed in black on a blue or green base.
摘要:
In an optical reading apparatus having an image sensor for converting optically readable information into an electrical signal, a sensor driving circuit is arranged to produce at least two clocks with which two or more groups of optical imaging elements of the image sensor are respectively driven. In one embodiment, the two clocks have a time or phase difference therebetween so that signal charges from one group of the imaging elements are derived at once after signal charges of another group are derived. The derived signal charges are read out in a sequence within a period equal to the time difference. This enables a charging time to be twice or more the time difference providing high sensitivity. Since at least two or more read data can be obtained within a single charging time, high-speed reading is also resulted. In another embodiment, the optical reader is switched so that one of high-speed mode and high-resolution mode is selected. In a further embodiment, the invention is adapted to a reader having an area image sensor.
摘要:
A bar code having parallel bars carrying information is divided into a plurality of regions so that each region is detected by a field of vision of an image sensor of a bar code reader. The bars in each region are detected by a scanning operation to store data indicative of the width of each bar into a memory. When scanning of a region is completed, detection of another region follows to store data in the same manner. After all the regions are scanned to obtain their data, these data are combined to produce a combined data. Some superfluous data due to overlapping of two consecutive regions are removed from the combined data. In one embodiment, the superfluous data are removed by using data indicative separation bars provided between the two consecutive regions, while in another embodiment, the superfluous data are removed by using a predetermined value indicative of the actual number of bars of the bar code.
摘要:
A bar code scanner for scanning bar codes having a plurality of parallel bar symbols recorded in different light reflective colors on a record medium. The scanner has a light source, an image sensor comprising a plurality of light responsive elements which are aligned and activated one by one, and diaphragm having an aperture which is longitudinally extending in orthogonal relation with the straight line of the aligned elements.
摘要:
In an optical reading apparatus having a reading sensor for converting optically readable information into an electrical analog signal, an automatic gain control circuit is provided to maintain the amplitude of the electrical signal constant. The gain of the automatic gain control circuit is controlled such that the average or peak voltage of the electrical signal derived from the reading sensor is detected and held until next scanning effected by the reading sensor so that a variable impedance element included in the automatic gain control circuit will be controlled in accordance with the held voltage to maintain the amplitude of the electrical signal constant.
摘要:
In an optical reading apparatus having a reading sensor for converting optically readable information into an electrical signal by electronically scanning an image of optical information, such as a bar code, a detector is provided to detect the intensity of light incident on an information label on which the information is provided. Data indicative of the light intensity is used to determine a subsequent scanning period in such a manner that the scanning period of the reading sensor is shortened when the light intensity increases or vice versa. Since the decrease in the scanning period results in lower output voltage from the reading sensor, undesirable saturation in circuitry following the reading sensor is effectively prevented, providing stable operation of the reading sensor, such as a bar code reader.
摘要:
A method for manufacturing a liquid-ejection head substrate including a silicon substrate having a supply port for supplying liquid is provided. The method includes: forming an etching mask layer on a surface of the silicon substrate, the etching mask layer having an opening in a portion corresponding to the supply port; forming a first recess in the surface of the silicon substrate by anisotropically etching the silicon substrate through the opening in the etching mask layer; forming a second recess that extends toward the other surface of the silicon substrate, in a surface of the first recess in the silicon substrate; and forming the supply port by anisotropically etching the silicon substrate from the surface provided with the second recess.
摘要:
Provided is a process for producing a substrate for a liquid ejection head, including forming a liquid supply port in a silicon substrate, the process including the steps of (a) forming an etch stop layer at a portion of a front surface of the silicon substrate at which portion the liquid supply port is to be formed; (b) performing dry etching using a Bosch process from a rear surface side of the silicon substrate up to the etch stop layer with use of an etching mask formed on a rear surface of the silicon substrate to thereby form the liquid supply port; and (c) simultaneously removing the etch stop layer and a deposition film formed inside the liquid supply port.
摘要:
Provided is a process of producing a liquid discharge head having a substrate, a passage-forming member, and a patterned layer. The process includes providing a resin layer on a substrate; providing a resist pattern on the resin layer for patterning the resin layer; forming a patterned layer by patterning the resin layer using the resist pattern as a mask; providing a layer for forming a passage pattern having a shape of passage on the resist pattern lying on the patterned layer; forming a passage pattern by patterning the layer for forming a passage pattern; removing the resist pattern; providing a passage-forming member so as to cover the passage pattern and the patterned layer; and removing the passage pattern to give the passage.
摘要:
In an ink jet head circuit board including a heater for generating thermal energy used for ejecting ink in response to application of electricity, a drop in thermal energy efficiency is prevented while reducing an area of the heater to achieve higher-resolution and higher-image-quality printing, and damages on the heater attributable to a manufacturing process are avoided. To achieve this, a resistor layer is disposed on an electrode wire layer; and two protective layers are disposed thereon. Then the upper protective layer is removed in a site above the heater. Accordingly, it is possible to dispose the protective layers without causing a decrease in an effective bubble generating region, and to improve thermal energy efficiency by reducing the effective thickness of the protective layer above the heater. Moreover, the resistor layer is covered with the first protective layer and is thereby prevented from adverse effects in the manufacturing process such as etching processes.