受験番号：26IPE011

問１.
[Claim 1]
An energy-dispersive x-ray detector that irradiates a test piece with
an electron beam, an x ray, and another ray, to detect a characteristic x ray
generated from a surface of the test piece for ultimate analysis, comprising:an element holder accommodating a semiconductor x-ray detection element
and provided with a cylindrical internal thread; and a finger bodyaccommodating a substrate that has an initial stage field-effect transistor(FET) for amplifying a signal from the semiconductor x-ray detection
element, including a cooling system, and provided with an external thread,wherein the energy-dispersive x-ray detector is configured such thatthe element holder and the finger body are fastened by the internal thread
and the external thread to fix the semiconductor x-ray detection element.
[Claim 2]
The energy-dispersive x-ray detector according to claim 1, wherein
the element holder is made of a metal material having a high thermal
expansion coefficient, and the finger body is made of a metal material having
a thermal expansion coefficient lower than the thermal expansion coefficientof the element holder.
[Claim 3]
The energy-dispersive x-ray detector according to claim 1, wherein
the element holder is provided with a slit-like opening for allowing ahigh-voltage conductor to pass through the element holder, the high-voltage
conductor being configured to supply a voltage to an electrode of thesemiconductor x-ray detection element.
問２．
One of the conventional, typical methods for image compression is
the JPEG method, which is standardized by the ISO. This method uses
discrete cosine transform (DCT), and if a relatively large number of coded
bits are allocated, the method has been known to provide favorable codedand decoded images. However, if the number of coded bits are decreased toa certain degree or more, remarkable blocking artifacts are generated,causing significant degradation from a subjective viewpoint.
On the other hand, in recent years, active studies have been
conducted on methods of dividing an image into a plurality of bands using afilter, called a filter bank, configured with a combination of a high-pass filter
and a low-pass filter, and coding the image on a band-by-band basis.
Among them, wavelet transformation coding is regarded as a promisingtechnology serving as a substitute for DCT. This is because wavelet
transformation coding has no defects such as remarkable blocking artifacts
under high compression as in DCT.
For example, JPEG 2000, which has been internationallystandardized in January 2001, adopts a method configured with a
combination of the wavelet transformation above and efficient entropy
coding, and highly improves coding efficiency in comparison with JPEG.
問３．
Specifically, the electronic paper device 26 is of a conventionallywell-known, self-writing type that can display predetermined information as
an image on an image display unit under a voltage applied state, and retain
it under a de-energized state, as described below. In a state in which novoltage is applied by the microprocessor 23 via a driver to each pixel
electrode that configures a matrix in the image display unit, white particles
negatively (−) charged are accumulated on a back surface side of the image
display unit, whereas black particles positively (+) charged remain on a front
surface side of the image display unit. Accordingly, the image display unit
are brought into a black-colored state when seen from its front surface side.
Subsequently, when the driver operates based on electronic data output by
the microprocessor 23, and reverses polarity of pixel electrodes in a required
portion of the matrix in accordance with the information to be displayed as
an image, positional relations between the black and white particles areinterchanged as appropriate, so that the information having a contrast
between the black and white particles is displayed as an image on the image
display unit. In addition, the electronic paper device 26 can retain theimage display state as it is, even under the de-energized state in which novoltage is applied via the driver to each pixel electrode that configures thematrix in the image display unit.