摘要:
A surface mount type semiconductor device is disclosed. The semiconductor device has testing lands on a lower surface of a wiring substrate with a semiconductor chip mounted thereon. Lower surface-side lands with solder balls coupled thereto respectively and testing lands with solder balls not coupled thereto are formed on a lower surface of a wiring substrate. To suppress the occurrence of contact imperfection between the testing lands and land contacting contact pins provided in a probe socket, the diameter of each testing land is set larger than the diameter of each lower surface-side land. Even when the wiring substrate is reduced in size, electrical characteristic tests using the testing lands can be done with high accuracy.
摘要:
An optical waveguide element includes: an optical waveguide including an organic non-linear optical material; a first electrode arranged on one surface side of the optical waveguide; a second electrode arranged on another surface side of the optical waveguide; a protective member disposed on the second electrode, the protective member including (i) a third electrode which is provided on a first surface of the protective member, the first surface facing the second electrode, the third electrode being electrically connected to the second electrode, (ii) a fourth electrode which is provided on a second surface of the protective member, the second surface opposing the first surface, and (iii) a conductive portion which penetrates through the protective member from the first surface to the second surface, and electrically connects the third electrode and the fourth electrode.
摘要:
A nonvolatile semiconductor memory device includes a latch configured to store data, a plurality of word lines, a driver configured to activate one of the plurality of word lines, and a plurality of nonvolatile memory cells coupled to the respective word lines, each of the nonvolatile memory cells coupled to the latch so as to exchange stored data with the latch upon activation of a corresponding one of the word lines, each of the nonvolatile memory cells including two MIS transistors and configured to store data as an irreversible change of transistor characteristics occurring in one of the two MIS transistors, wherein the driver includes at least one nonvolatile memory cell storing count data responsive to a number of times storing of data has been performed with respect to the plurality of nonvolatile memory cells, and is configured to activate one of the word lines indicated by the count data.
摘要:
A nonvolatile semiconductor memory device includes a first latch to store data, a nonvolatile memory cell including two MIS transistors to store data as an irreversible change of transistor characteristics occurring in one of the two MIS transistors selected in response to the data stored in the first latch, a second latch to store data obtained by sensing a difference in the transistor characteristics between the two MIS transistors, a logic circuit to produce a signal indicative of comparison between the data of the first latch and the data of the second latch, and a control circuit configured to repeat a store operation storing data in the nonvolatile memory cell, a recall operation storing data in the second latch, and a verify operation producing the signal indicative of comparison until the signal indicates that the data of the first latch and the data of the second latch are the same.
摘要:
By preparing a package substrate which has a plurality of lands of NSMD structure, and the output wiring and dummy wiring which were connected to each of the lands, and have been arranged mutually in the location of 180° symmetry, and printing solder by a printing method to the lands after the package assembly, the variation in the height of the solder coat between lands can be reduced, and improvement in the mountability of LGA (semiconductor device) is achieved.
摘要:
A light emitting component includes plural of light emitting elements arranged in rows on a substrate, plural lenses provided to face light emitting faces to which light beams of the plural light emitting elements are emitted, and condensing the light beams emitted from the light emitting elements, and one or plural pedestals holding the lenses such that the light emitting faces of the respective light emitting elements of the plural light emitting elements and the lenses that face the light emitting elements face the light emitting faces via gaps.
摘要:
There is provided an optical device including: a passive core layer in which is formed an optical circuit having a refractive index n2; an active core layer covering at least a portion of the optical circuit, exhibiting an electro-optical effect, and having a refractive index of n1 higher than n2; a lower clad layer over which the passive core layer is formed and having a refractive index n3 lower than n2; an upper clad layer covering the active and passive core layers and having a refractive index n5 lower than n1; a lower electrode disposed below the lower clad layer; and an upper electrode disposed on the upper clad layer, in which the entrance and exit portions of the active core layer are tapered, respectively.
摘要:
A light emitting unit includes a substrate, plural light emitting elements disposed on the substrate, and a lens array disposed above the plural light emitting elements. The lens array includes a base and plural lenses that each focus light emitted from a corresponding light emitting element among the plural light emitting elements. The base includes a boundary surface which is in contact with the plural lenses and an opposing surface which opposes the plural light emitting elements. The distance from one of the plural light emitting elements to the boundary surface of the base which is in contact with a corresponding lens among the plural lenses is different from the distance from another one of the plural light emitting elements to the boundary surface of the base which is in contact with a corresponding lens among the plural lenses.
摘要:
There is provided a method of producing a waveguide element comprising steps of forming a lower cladding layer having a refractive index n1 on a substrate having a lower electrode; forming an active core layer having a refractive index n2 and exhibiting an electro-optical effect on a surface of the lower cladding layer; forming a protective layer having a reflective index n4 on a surface of the active core layer; forming a passive core layer having a reflective index n3 on a surface of the protective layer; exposing the passive core layer with a predetermined pattern to form an optical circuit; forming an upper cladding layer on a surface of the passive core layer; forming an upper electrode on a surface of the upper cladding layer; and performing a polarization orientation treatment in which the active core layer is softened or liquidized and cured while the electric field is applied.
摘要:
According to one embodiment, an inkjet head includes a head main body having a plurality of nozzles and drive elements which discharges ink from the plurality of nozzles, a control section which controls the drive elements, and a ceramic base on which the head main body and the control section are arranged. The inkjet head further includes a cover which is formed of a resin in which ceramic particles are mixed, and fixed to the base to cover the control section and hold the control section inside, and an adhesive which is interposed between the base and the cover, and seals an interior of the cover.