JP2006311575A - Two-dimensional image pickup apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To structurally adapt a two-dimensional image pickup apparatus to absorb external impacts and deformation such as the deflection of the cabinet so that the interior is protected against damage and keep restorableness even if the cabinet is deformed by an external load. <P>SOLUTION: The two-dimensional image pickup apparatus contains in an apparatus cabinet 8, a two-dimensional photoelectric converting device including a plurality of photoelectric converters 2a formed on a substrate 2b, and a phosphor 1 arranged on the plurality of photoelectric converters 2a. A shock absorber 9 is included between the phosphor 1 and a portion of the apparatus cabinet 8 facing a light-receiving portion of the photoelectric converting device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a two-dimensional imaging apparatus, and more particularly to a two-dimensional imaging apparatus that can be used for X-ray imaging and the like.

  As shown in FIG. 1, for example, an imaging apparatus used for X-ray imaging includes a fluorescent plate 1 that converts X-rays into visible light, a photoelectric conversion element 2a that converts this visible light into an electrical signal, and this photoelectric conversion. A substrate 2b on which the element 2a is formed, a base 7 for supporting the substrate 2b, circuit boards 5a and 5b for processing photoelectrically converted electric signals, these wirings, and a device housing for housing them. And a body 8.

  Here, the substrate 2b (hereinafter referred to as the substrate) of the photoelectric conversion element 2a is made of a glass plate because of the necessity of having no chemical action with the semiconductor element, withstanding the temperature of the semiconductor formation process, dimensional stability, and the like. Is often used. In addition, as the fluorescent plate 1 which is a fluorescent material, a metal plate fluorescent material applied to a resin plate is used. The distance between the fluorescent plate 1 and the photoelectric conversion element 2a must be kept at a sufficiently small value (for example, several tens of micrometers or less) compared to the pixel size (for example, about several hundred micrometers) of the photoelectric conversion element 2a. In the upper part, the fluorescent plate 1 and the substrate 2b are bonded. In the figure, members formed on the substrate 2 b including the fluorescent plate 1 and the moisture-impermeable film 6 are collectively referred to as an optical conversion device 102.

  Moreover, when moisture resistance is calculated | required by the photoelectric conversion element 2a, the fluorescent plate 1 and the photoelectric conversion element 2a may be sealed with the film 6 which is impermeable to moisture and X-ray transmissive. These are bonded and fixed to the base 7 and then housed in the apparatus housing 8 to constitute an X-ray imaging apparatus.

  This type of imaging apparatus has been used in stationary X-ray imaging apparatuses, but in recent years, a lightweight, small, and portable imaging apparatus has been required to enable faster and more accurate imaging. It has become.

  In the configuration described above, it is possible to protect the substrate 2b and the like from an impact applied during transportation, and to prevent deformation due to an external load 201 (mainly a human body load that is a subject) applied during X-ray imaging. Therefore, it is necessary to make the base 7 and the apparatus housing 8 have a strong structure. In order to satisfy this requirement, the above-described imaging apparatus is hindered from being reduced in size and weight.

  The present invention has been made based on the above circumstances, and the purpose thereof is to absorb deformations such as impacts applied from the outside and bending of the housing, and even if the housing is deformed by an external load, An object of the present invention is to provide a mounting structure for a two-dimensional imaging device that can ensure internal protection and maintain recoverability.

  For this reason, in the two-dimensional imaging device of the present invention, a two-dimensional photoelectric conversion device having a plurality of photoelectric conversion elements formed on a substrate and a phosphor disposed on the plurality of photoelectric conversion elements are arranged in an apparatus housing. In the two-dimensional imaging device housed in the body, a buffer unit is provided between the phosphor and a portion of the device housing facing the light receiving unit of the photoelectric conversion device.

  In addition, it is preferable that the said buffer means is a container, the said container encloses gas, and also the said container is an air sac.

  The two-dimensional imaging device has a base for fixing the photoelectric conversion device.

  In addition, a circuit board for processing an electric signal of the photoelectric conversion element may be provided in the apparatus housing, and a cooling unit may be provided in contact with the electronic component on the circuit board. The cooling means may be a container having a coolant inside.

  Furthermore, in the two-dimensional X-ray imaging apparatus of the present invention, in the two-dimensional X-ray imaging apparatus in which a two-dimensional photoelectric conversion apparatus having a plurality of photoelectric conversion elements arranged on a substrate is housed in an apparatus housing, the photoelectric conversion is performed. A buffer means is provided between the X-ray light receiving part of the device and a part of the device housing facing the light receiving part of the photoelectric conversion device.

  The present invention can achieve further downsizing and weight reduction of the apparatus by adopting a configuration excellent in impact resistance and / or load resistance. Thereby, it is possible to provide a two-dimensional imaging device having good portability.

  In particular, in a two-dimensional X-ray imaging apparatus in which a substrate and a two-dimensional photoelectric conversion element formed on the substrate are housed in an apparatus housing, a plurality of containers, for example, air sac are disposed in the gap between the substrate and the apparatus housing. By inserting such a buffer member so that the inner wall surface of the device housing and the substrate do not come into contact with each other, even if the housing or the top plate is deformed, the internal components may be damaged. Therefore, further downsizing and weight reduction of the device can be achieved, good portability can be maintained, and cooling liquid can be stored in some of the containers to improve the heat dissipation of the circuit. We can expect effect to make.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. 2 is a schematic cross-sectional view for explaining a reference example, and FIG. 3A, FIG. 4 and FIG. 5 are schematic views for explaining an example of the two-dimensional imaging device of the present invention. FIG. 3B is a cross-sectional view, and FIG. 3B is a schematic perspective view of the two-dimensional imaging apparatus shown in FIG. Further, the present invention is not limited to the following description and drawings used, and can be appropriately modified within the scope of the gist of the present invention.

(Reference example)
First, a reference example of the present invention is shown in FIG. In FIG. 2, the same reference numerals are used for the same constituent members as shown in FIG. In particular, in this reference example, at least the top plate 81 constituting the casing is made of a displaceable material. Thereby, regarding a small impact, the top plate 81 is displaced in the space provided between the top plate 81 and the photoelectric conversion device 102 so that the impact is not transmitted to the photoelectric conversion device 102 or even if it is transmitted, The influence can be reduced.

  Further, in this reference example, the rigidity of the base 7 on which the photoelectric conversion device 102 is placed and fixed (difficult to be displaced by applying a force) is larger than that of the top plate 81, and thus is shown in FIG. Thus, even when the load 201 is applied to the top plate 81, the applied force is received by the base 7 having a smaller displacement (deformation amount) than the top plate 81, and the photoelectric conversion device 102 is not deformed and damaged. .

  The top plate 81 is preferably made of a material that has impact resistance and is excellent in resilience after a force such as a load is removed. Specifically, a reinforced resin using carbon or Kevlar, a polyamide resin, a polyimide resin, or the like can be preferably used. Among them, carbon fiber reinforced resin using carbon can be said to be a preferable material including X-ray transmission characteristics.

(First embodiment)
The first embodiment of the present invention will be specifically described below with reference to (a) and (b) of FIG. Here, reference numeral 1 is a fluorescent plate, 2a is a two-dimensional photoelectric conversion element, 2b is a substrate such as glass, 6 is a moisture-impermeable film, and the moisture-impermeable film 6, the phosphor plate 1 and the substrate 2b are integrated with each other. It is glued.

  Reference numeral 5a denotes a flexible circuit board for taking out a signal of the photoelectric conversion element, and 5b denotes a circuit board used for signal processing. These are folded and installed on the back side of the board 2b for miniaturization. ing. Note that all of the above components are extremely brittle and vulnerable to impact, such as glass plates and semiconductor components.

  A container 9, for example, an air sac, in which a gas such as air is enclosed is inserted as a buffering means in the gap between these and the apparatus housing 8 uniformly. The container 9 is formed of an X-ray transparent elastic material, defines the position of the photoelectric conversion element 2a with respect to the apparatus housing 8, absorbs an impact load by compressive deformability of the internal gas, and the substrate 2b. Protects fragile parts from impacts such as transportation.

  In addition, during X-ray imaging, as described above, a load of a subject is applied to the apparatus housing 8 and the apparatus housing 8 may be deformed. However, the container 9 disperses the load, and the substrate 9 The concentrated load is prevented from being applied to a part of 2b and the like, and these are prevented from being damaged.

  As described above, the apparatus housing 8 itself needs to be X-ray transmission performance and lightweight, and thus is configured by combining a metal plate and a material such as CFRP (carbon fiber reinforced resin). However, with regard to load-bearing performance, the elastic deformation of the container 9 compensates for strength and protects internal parts, so special considerations (considerations such as increasing the plate thickness and counteracting weight reduction) ) Is not necessary.

(Second Embodiment)
FIG. 4 shows a second embodiment of the present invention. Here, since most of the electronic components 5c mounted on the circuit board 5b consume electric power and generate heat, at least the container 9 in contact with the cooling liquid 9a is sealed in the inside thereof, and the cooling effect is obtained. It is demonstrated. That is, this facilitates heat dissipation of the electronic components, prevents malfunction of the circuit due to heat, and achieves further downsizing of the housing.

  It is desirable that the container 9 filled with the cooling liquid is in contact with the electronic component 5c and the apparatus housing 8 at the same time. Needless to say, the portion of the housing 8 that contacts the container 9 is advantageously made of a material having excellent thermal conductivity such as metal. Furthermore, it is also effective to attach heat radiating fins (not shown) to the apparatus housing 8 within a range where the size is allowed.

(Third embodiment)
There is no particular limitation on the shape and size of the container 9 serving as a buffering means in the present invention, but in FIG. 5, the container 9 on the incident side of the X-ray 101 is the entire light receiving surface with one container 9 or An example in which at least a large part is covered is shown.

  By doing so, absorption of slight X-rays in the X-ray transmission direction of the container 9 can be suppressed, and the resolution of the transmitted X-ray dose can be further improved. In addition, in the container 9, besides a gas and a liquid, a gel-like or deformable solid substance may be used. However, on the light receiving surface side, it is desirable to sufficiently consider the transmission characteristics of electromagnetic waves having a desired wavelength.

It is typical sectional drawing which shows an example of a normal two-dimensional imaging device. It is sectional drawing which shows the reference example of this invention. It is (a) sectional drawing and (b) perspective view which show the 1st Embodiment of this invention. It is sectional drawing which shows the 2nd Embodiment of this invention. It is sectional drawing which shows the 3rd Embodiment of this invention.

Explanation of symbols

1 Fluorescent screen (phosphor)
2a Photoelectric conversion element 2b Substrate 5a Flexible circuit board 5b Circuit board 5c Electronic component 6 Moisture impermeable film 8, 8 'Case 9 Container (buffer means, buffer member)
9a Coolant 101 X-ray 102 Photoelectric conversion device 201 Load

Claims (8)

In a two-dimensional imaging device in which a two-dimensional photoelectric conversion device having a plurality of photoelectric conversion elements formed on a substrate and a phosphor disposed on the plurality of photoelectric conversion elements are housed in an apparatus housing,
A two-dimensional image pickup apparatus comprising a buffer unit between the phosphor and a portion of the device casing facing the light receiving unit of the photoelectric conversion device.   The two-dimensional imaging apparatus according to claim 1, wherein the buffer means is a container.   The two-dimensional imaging apparatus according to claim 2, wherein the container is filled with gas.   The two-dimensional imaging apparatus according to claim 3, wherein the container is an air sac.   The two-dimensional imaging device according to claim 1, further comprising a base for fixing the photoelectric conversion device.   2. The circuit board according to claim 1, further comprising a circuit board for processing an electrical signal of the photoelectric conversion element in the apparatus housing, wherein cooling means is provided in contact with an electronic component on the circuit board. 2D imaging device.   The two-dimensional imaging apparatus according to claim 6, wherein the cooling unit includes a container having a coolant inside. In a two-dimensional X-ray imaging device in which a two-dimensional photoelectric conversion device having a plurality of photoelectric conversion elements arranged on a substrate is housed in a device housing,
A two-dimensional X-ray imaging apparatus, comprising: a buffer unit between an X-ray light receiving unit of the photoelectric conversion device and a portion of the device housing facing the light receiving unit of the photoelectric conversion device.

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