JP3194573B2 - Glass element identification code reader in glass dosimeter reader and dosimeter glass element used therein - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a glass dosimeter.
Glass that reads the identification code attached to the glass element
Device identification code reader and dosimeter used therefor
It relates to a glass element .

[0002]

2. Description of the Related Art Generally, a radiation exposure dose is measured by exciting a radiation-exposed glass element with ultraviolet rays and detecting the amount of fluorescence generated from a predetermined glass surface. As a glass dosimeter using such a glass element, for example, a glass dosimeter disclosed in Japanese Patent Publication No. Hei 6-16090 is known. This glass dosimeter is shown in FIG.
As shown in FIG. 4, the flat-type glass element 11 is configured by being fitted into one side of a glass element holder 12 made of stainless steel. This glass element holder 12
On the other side, an identification hole 13 is provided as an identification code for identifying the glass element holder 12. Then, the glass element holder 12 is housed in the lower case 15 of the capsule holder 14 along the arrow E direction. Further, the lower case 15 is mounted on the upper case 16 of the capsule holder 14 along the arrow F direction.

To read the exposure dose of the glass element 11, after the upper case 16 is removed, the glass element holder 12 is moved from the lower case 15 to the arrow G shown in FIG.
It is extruded in the direction and is mounted on a predetermined table. When the glass element holder 12 is mounted on this table, light is emitted from the light source such as an optical fiber to the glass element holder 12, and the light transmitted through the glass element holder 12 is converted into an electric signal by the photoelectric conversion element. Then, the identification code of the identification hole 13 is read based on the electric signal.

Thereafter, the table on which the glass element holder 12 is mounted is set at a measurement position, and the glass element 11 is irradiated with ultraviolet rays from an N 2 gas laser. At this time, the intensity of the fluorescent light output from the glass element 11 is measured by the photomultiplier tube, and the exposure dose is obtained. The exposure dose obtained in this way is stored in a memory such as a floppy disk as personal exposure management data together with the identification code. Therefore, based on various data stored in the memory, it is possible to perform data processing necessary for personal exposure dose management periodically or at the time of dose measurement, and to obtain the cumulative exposure dose etc. of the worker who handled the dosimeter at regular intervals. it can.

[0005] However, the above-described apparatus for reading the identification code of the conventional glass dosimeter has the following problems. That is, since the glass element 11 is fitted into the glass element holder 12 made of stainless steel as described above, and the glass element holder 12 is provided with an identification code for identifying the glass element 11, the size of the entire glass dosimeter is increased. Has to be quite large. Therefore, when a small dosimeter is needed, for example, a dosimeter for local exposure to be worn on the fingertip, that is, a small dosimeter such as a ring-type dosimeter, it is not possible to attach an identification code to the glass element holder. Can not.

Therefore, in such a small dosimeter, it is necessary to attach an identification code to the glass element itself.
As a method of attaching an identification code to a glass element, for example,
It is possible to use a heat-resistant ink or the like. When such a glass element is irradiated with light, the portion where the identification code is printed does not transmit light, and the other portions transmit light,
As a result of receiving the light by the photoelectric conversion element, a difference in brightness between the part where the identification code is printed and the other part is detected. However, when such a glass element is irradiated with ultraviolet rays for measuring the exposure dose, there is a disadvantage that unnecessary fluorescence is generated from a printed portion, which adversely affects the measurement of the exposure dose.

Therefore, a method of attaching an identification code to the surface of a glass element using a carbon dioxide laser or the like has been devised. That is, this method is a method in which a carbon dioxide laser or the like is applied to the surface of the glass element to generate a crack on the surface of the glass element due to a rapid temperature difference, and is called a heat shock method or a thermal shock method. By shaving off a part of the surface of the glass element by such a method, when an identification code is attached, it is possible to prevent an adverse effect upon irradiation with ultraviolet rays.

[0008]

However, when the above-described thermal shock method using a carbon dioxide gas laser or the like is used, there are the following problems. In the conventional method, when the identification code is read, diffused light such as natural light is used, so when the identification code is printed with heat-resistant ink, etc., the difference in brightness between the printed part and the other part is clearly detected. However, when the identification code is attached by the thermal shock method, it is difficult to detect the difference in brightness between the part to which the identification code is attached and the other part. That is, since the identification code is represented by simply shaving the surface of the glass element, light is transmitted also in that part, and as a result of receiving light by the photoelectric conversion element, the part with the identification code and the other part are separated. Is not sufficiently detected.

Therefore, when the transmitted light transmitted through the glass element is converted into an electric signal by the photoelectric conversion element and character recognition is performed by image processing based on the electric signal, a clear image of the identification code cannot be obtained. However, there is a problem that character recognition by automatic reading of the identification code is difficult.

In addition, when an identification code is attached to a glass element by the above-mentioned thermal shock method, there is a problem that the glass is chipped and the character representing the identification code is easily broken due to its characteristics. In particular, in a glass element used for a small dosimeter for local exposure as described above, the identification code is 1 mm ×
Since the characters are composed of fine characters of about 1 mm, the tendency is strong, and there are cases where it is difficult for humans to recognize them visually.

Further, since the characters constituting the conventional identification code have different widths and heights depending on the fonts, it is not easy to detect and recognize the characters. For example, uppercase and lowercase letters have different character widths and heights. Even if the same uppercase letter is used, for example, "W" has a wide character width and "I"
Was narrow. Therefore, as a method for detecting such a character, for example, the following method has been used. That is, first, when a certain space is detected within a certain range to which an identification code is attached, it is determined as a gap between characters, and thereby, a height direction of one character is determined. And the edges in the width direction are detected, and the rectangle surrounding the edges in each direction is set as the character frame of the character. Then, the recognition process is performed on the characters in the character frame. Therefore, conventionally, such character position detection and recognition processing had to be performed for each character constituting the identification code.

In view of such a problem, as a method of expressing characters constituting a character, for example, there is a method of expressing the characters by seven segments as shown in FIG. However, the seven segments cannot represent alphabets such as "B", "D", and "K". That is, there has been a problem that not all alphabets can be expressed and that it is difficult for humans to visually recognize the alphabet.

The present invention has been made in view of the above circumstances, and has no adverse effect on the measurement of exposure dose and can clearly read an identification code attached to the glass element of the dosimeter itself. It is intended to provide a device. Further, a glass element identification code reader and a dosimeter that express each character such as an identification code clearly and realize a simplification and a high speed of a recognition method for recognizing the character.
It is intended to provide a semiconductor device .

[0014]

According to the first aspect of the present invention, there is provided a glass element identification code reading apparatus which is exposed to radiation.
To dosimeter glass elements, ultraviolet rays from the N ₂ gas laser
To detect the amount of fluorescence emitted from a given glass surface.
Dose to measure radiation exposure dose
In a glass element identification code reader used in a meter reading device and reading the identification code of a small dosimeter glass element with an identification code by shaving off a part of the surface , the surface of the glass element is irradiated with light. A point light source; and the light from the point light source ,
Light receiving means for receiving transmitted light transmitted through portions other than the separate code .

According to the first aspect of the present invention, the light transmitted through the glass element among the lights emitted from the point light source to the dosimeter glass element is received by the light receiving means. On the other hand, in an inhomogeneous portion of the dosimeter glass element to which the identification code is attached, light emitted from the point light source is scattered and becomes scattered light. Therefore, the scattered light is not received by the light receiving means, and only the transmitted light is received through the other homogeneous portions. Therefore, the image obtained by the light receiving means is
The part with the identification code is dark, and the other part is a bright image.

According to a second aspect of the present invention, there is provided a glass element identification code reading apparatus, wherein the glass element is exposed to radiation.
Is irradiated with ultraviolet light from a N ₂ gas laser,
Emitted by detecting the amount of fluorescence emitted from the glass surface
For use in glass dosimeter readers that measure radiation dose
In a glass element identification code reader for reading the identification code of a small dosimeter glass element with an identification code by shaving off a part of the surface, a point light source that irradiates the surface of the glass element with light, A glass that is disposed between a point light source and the glass element, transmits the light emitted from the point light source to the glass element, and transmits a portion of the glass element other than the identification code.
It is characterized by comprising a translucent reflecting mirror for reflecting light reflected from the back surface of the element and a light receiving means for receiving the light reflected by the translucent reflecting mirror.

According to the second aspect of the invention having such a configuration, a part of the transmitted light transmitted through the front surface of the glass element is reflected by the back surface of the glass element to become reflected light. The reflected light is reflected by the translucent reflecting mirror and received by the light receiving means. On the other hand, in the heterogeneous part identification code of the glass element is attached, the light emitted from the point light source is scattered scattered light. Therefore, this scattered light is not reflected by the translucent mirror as reflected light, and is not received by the light receiving means. Therefore, in the image obtained by the light receiving means, the part provided with the identification code is dark, and the other parts are bright, so that the difference in brightness is clear.

According to a third aspect of the present invention, in the glass element identification code reading apparatus, the identification code of the glass element is converted into a set of a fixed number of segments in which each character is to be arranged at a predetermined position. A plurality of segments selected from the group of segments, the number of segments in the height direction and the number of segments in the width direction of each character are configured to be displayed in a unified manner, and for the individual characters, Recognition of the character is performed by determining which segment of the segment group constitutes the segment constituting the character.

According to the invention having such a configuration, the individual characters constituting the identification code, for example, the size of each character in the height direction is equivalent to two segments, and the size in the width direction is also equivalent to two segments. And so on. With this configuration, it is possible to simplify the position detection of a character that requires complicated processing such as setting of a frame for position detection due to the difference in height and width of each character.
In recognizing the identification code, the recognition can be performed by determining which segment of the segment group each character is composed of. That is, the identification code recognition process can be simplified and the speed can be increased.

A small dosimeter glass according to the invention of claim 4
The element comprises an individual character composed of a plurality of segments selected from a set of segments consisting of a fixed number of segments to be arranged at predetermined positions, and a height direction of each character. It is characterized by unifying the number of segments and the number of segments in the width direction.

According to the fourth aspect of the invention having such a structure, the height and width of each character are unified by unifying the size in the height direction and the size in the width direction. , The complicated processing for position detection due to the difference between the two can be simplified.

[0022] A small dosimeter glass according to the invention of claim 5.
The element comprises a set of segment groups, eight segments each forming two square frames each having two pieces in the height direction and the width direction, and four segments for dividing the frame into four squares. It is characterized by comprising 20 segments consisting of a segment and two segments each forming a diagonal line for each of the four squares.

According to the fifth aspect of the invention having such a configuration, the shape of each character can be made different by 20 segments, and not only numbers but also all alphabets can be expressed. In addition, it is possible to form characters that can be easily recognized by humans.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. (1) First Embodiment (1-1) Configuration FIG. 1 shows a schematic configuration of a reading unit of a glass element identification code reading device according to the present embodiment. In FIG. 1, 1 is a light emitting diode, 2 and 4 are convex lenses (hereinafter simply referred to as lenses), and 5 is a charge-coupled device (hereinafter CC).
D). The light emitting diode 1, lenses 2, 4 and CCD 5 are coaxially arranged in a line.

The lens 2 is arranged near the light emitting diode 1 and transmits light from the light emitting diode 1. The light transmitted through the lens 2 is converged on the lens 4 as parallel light. Lens 4 is CCD5
, And condenses light from the lens 2,
The light is incident on the CCD 5.

When the light condensed by the lens 4 enters the CCD 5, the CCD 5 outputs an electric signal proportional to the intensity of the light. That is, CC
D5 converts an optical image projected onto the CCD 5 through the lens 4 into an electric signal in pixel units.

Further, a glass element 3 is disposed between the lens 2 and the lens 4. The light emitted from the light emitting diode 1 and transmitted through the lens 2 is transmitted through the glass element 3 and collected on the lens 4.

The lens 4 is provided to project an optical image of the glass element 3 onto the CCD 5 when the glass element 3 is larger than the CCD 5 as shown in FIG. Therefore, when the glass element 3 is smaller than the CCD 5 or when the CCD 5 is larger than the glass element 3 and the light transmitted through the glass element 3 can be directly incident on the CCD 5, the lens 4 need not be provided.

FIG. 2 shows the overall configuration of the glass element identification code reader according to the present embodiment. In FIG. 2, reference numeral 20 denotes a CCD camera provided with the above-mentioned CCD, which is connected to an image processing device 22 via a video cable 21. The image processing device 22 includes a frame memory 23 for storing image data captured by the CCD camera 20, and a CPU 24 for performing character recognition from the image data stored in the frame memory 23.

The image processing device 22 is provided with an RS-2
It is connected to a host device 26 such as a controller via a 32C cable 25. The host device 26 includes a dose measuring device that measures the exposure dose of the glass element 3, an input device that issues an operation command to the image processing device 22 and inputs necessary data, and a display device that displays the above measurement results and the like. It is configured. The CPU 24 supplies the recognized character data to the host device 26. In the host device 26, the character data (that is, the identification code) is stored in the floppy disk together with the measurement result measured by the dosimeter. It is stored in a memory such as a disk.

(1-2) Function and Effect The function of the glass element identification code reader having the above-described configuration will be described. FIG. 3 shows an example of the glass element 3 provided with an identification code by a thermal shock method. As shown in FIG. 3, an identification number 3a as an identification code is written on the surface of the glass element 3 by a thermal shock method using a carbon dioxide laser or the like described above. Therefore, the portion indicated by the identification number 3a is a non-homogeneous portion compared to other homogeneous portions.

First, light generated from the light emitting diode 1 is converted into parallel light by the lens 2, transmitted through the glass element 3, and collected by the lens 4. Then, the light condensed by the lens 4 is incident on the CCD 5, whereby an optical image of the glass element 3 is projected on the CCD 5.

At this time, in a homogeneous portion of the glass element 3 where the identification number 3a is not given, light is transmitted as it is and enters the lens 4 as almost parallel light (this is called transmitted light). The light is scattered in the inhomogeneous portion 3a (this is called scattered light). Therefore, the scattered light transmitted through the inhomogeneous portion is not focused on the lens 4 but refracted and travels in another direction (for example, the direction of arrow A shown in FIG. 1). Therefore, the scattered light does not form an image on the CCD 5. Therefore, the optical image projected on the CCD 5 becomes an image as shown in FIG. That is, only the identification number 3a portion appears as a dark image, and the other portions appear as bright images. Therefore, only the identification number 3a can be obtained as a clear image.

Subsequently, an electric signal corresponding to such an image,
That is, image data is output from the CCD 5 and input to the image processing device 22 shown in FIG. Then, the image data is temporarily stored in the frame memory 23 in the image processing device 22. Thereafter, the CPU 24 recognizes the image based on the image data, and reads the identification number 3a. The read identification number is supplied to the host device 26 and stored in a memory (not shown) together with the exposure dose data read from the glass element 3.

As described above, according to the present embodiment, even if an identification number is given to a glass element by a thermal shock method using a carbon dioxide laser or the like, light generated in an inhomogeneous portion given the identification number is obtained. , A clear image of the identification number can be obtained. Therefore, character recognition by image processing, that is, automatic reading can be easily performed. Therefore, unlike the case where the identification number is assigned by printing, the measurement is not affected, and it can be easily adopted in a small dosimeter.

(2) Second Embodiment (2-1) Configuration FIG. 5 shows a schematic configuration of a reading unit of a glass element identification code reading device according to a second embodiment of the present invention. Note that the overall configuration of the glass element identification code reader is the same as that of the first embodiment. In the present embodiment, as shown in FIG. 5, a translucent reflecting mirror 6 (hereinafter, referred to as a semi-transparent mirror 6) is arranged between the lens 2 and the glass element 3. The semi-transparent mirror 6 is arranged at an angle of 45 ° with respect to the optical axis. Then, the lens 4 is arranged so as to condense the light reflected by the semi-transparent mirror 6, and the CCD 5 is arranged so that the light condensed by the lens 4 enters. In addition,
As in the first embodiment, the size of the glass element 3 is C
If the same as the CD 5 or smaller than the CCD 5, the lens 4 need not be provided.

(2-2) Functions and Effects With the above configuration, the light generated from the light emitting diode 1 passes through the lens 2 to become parallel light, passes through the semi-transparent mirror 6, and further passes through the glass element 3. At this time, a part of the transmitted light transmitted through the front surface of the glass element 3 via the semi-transparent mirror 6 is reflected on the back surface of the glass element 3 to be reflected light and returns to the semi-transparent mirror 6. Then, the reflected light is reflected by the semi-transparent mirror 6, refracted at a right angle, and condensed on the lens 4. The light condensed by the lens 4 is the same as that of the first embodiment.
It is converted into an electric signal by CD5.

At this time, in the non-homogeneous portion to which the identification number 3a is attached, light is scattered on the surface of the glass element 3 to be scattered light. Proceed in the direction. That is, unlike the reflected light of the transmitted light, the reflected light of the scattered light does not return to the semi-transparent mirror 6, so that C
No image is formed on CD5. For this reason, similarly to the first embodiment, an image in which only the identification number 3a is dark is obtained.

(3) Third Embodiment (3-1) Configuration FIG. 6 shows a schematic configuration of a reading unit of a glass element identification code reading device according to a third embodiment of the present invention. Note that the overall configuration of the glass element identification code reader is the same as that of the first embodiment. In the present embodiment, as shown in FIG. 6, a point light source 1a is used instead of the light emitting diode 1 as a light source. Then, the light from the point light source 1a is directly applied to the glass element 3, and the transmitted light transmitted through the glass element 3 is collected by the lens 4. Lens 4
The light collected by the CCD 5 is converted into an electric signal by the CCD 5 as in the above-described embodiments. Note that, as in the above-described embodiments, the size of the glass element 3 is C
If the same as the CD 5 or smaller than the CCD 5, the lens 4 need not be provided.

(3-2) Function and Effect With the above configuration, light is scattered and refracted in the direction of arrow C in the non-homogeneous portion of the glass element 3 with the identification number 3a. Therefore, the scattered light is not collected by the lens 4 and does not form an image on the CCD 5. Therefore, as in the above-described embodiments, an image in which only the identification number 3a is dark can be obtained.

(4) Fourth Embodiment (4-1) Configuration FIG. 7 shows a schematic configuration of a glass element identification code reading device according to a fourth embodiment of the present invention. Note that the overall configuration of the glass element identification code reader is the same as that of the first embodiment. In the present embodiment, as shown in FIG. 7, a point light source 1a is used as a light source, as in the third embodiment. Then, the semi-transparent mirror 6 is arranged between the point light source 1a and the glass element 3.
As a result, the reflected light on the back surface of the transmitted light transmitted through the front surface of the glass element 3 is reflected by the semi-transparent mirror 6 and refracted at a substantially right angle, and is condensed by the lens 4. Lens 4
A CCD 5 for converting the light condensed by the lens 4 into an electric signal is disposed in the vicinity of. As in the above-described embodiments, when the size of the glass element 3 is the same as or smaller than the CCD 5, the lens 4 need not be provided.

(4-2) Functions and Effects With the above configuration, the identification number 3a of the glass element 3 is obtained.
The reflected light of the scattered light scattered at the inhomogeneous portion marked with is refracted in the direction of arrow D without being reflected by the semi-transparent mirror 6. Therefore, a dark image is obtained only for the identification number 3a.

(5) Fifth Embodiment (5-1) Configuration Next, a glass element identification code reader according to a fifth embodiment will be described. The glass element identification code reader according to the present embodiment uses the glass element 3 shown in FIG. The glass element 3 according to the present embodiment
Can be used in any of the glass element identification code readers according to the above-described first to fourth embodiments.

In FIG. 8, the identification number 3a given to the glass element 3 is represented by a plurality of segments as described below. FIG. 9 is a diagram showing a set of segment groups constituting each character of the identification number 3a.
(A)-(c) is a figure which shows one segment which comprises said one set of segment group. That is, the segment group shown in FIG. 9 is composed of vertical and horizontal segments shown in FIG. 10A and oblique segments shown in FIGS. 10B and 10C. Specifically, FIG.
8 vertical and horizontal segments (Seg1 to Seg)
8) forms a square frame F of a certain size,
This frame F is composed of four vertical and horizontal segments (Seg 9 to S
EG12) is divided into four rectangles S1 to S4.

The four squares S1 to S4 are shown in FIG.
(B) and (c) are separated from each other by two oblique segments. That is, the square S1 is separated by the segments Seg13 and Seg14, the square S2 is separated by the segments Seg15 and Seg16, and the square S3 is separated by the segments Seg17 and Seg18.
And the square S4 is segment Seg1
9, Seg20.

As described above, each character of the identification number 3a is represented by using any one of the segment groups composed of the 20 segments. FIG. 11 shows an example in which numbers are represented by the segment group, and FIG.
Indicates an example representing an alphabet. For example, FIG.
As shown in the figure, the numeral "1" is composed of one oblique segment, two vertical segments, and two horizontal segments. Also, as shown in FIG. 12, the letter "I" has two horizontal segments up and down,
It consists of two vertical segments. That is,
Unlike “1” and “I” according to the conventional expression method shown in FIG. 15, the character width is the same as other characters.

As shown in FIGS. 11 and 12, both numerals and alphabets are characters having a height of two vertical segments and a width of two horizontal segments. That is, the height and width of all characters are unified.

When recognizing a character represented by such a segment, the CPU 24 shown in FIG.
The determination is made by determining the presence or absence of zero segments. For example, as shown in FIG. 9, numbers of Seg1 to Seg20 are assigned to each of 20 segments, and characters are recognized depending on which segment is present. Then, each character and the number of the segment forming the character are stored in a memory (not shown). For example, for the number “1”, the segments Seg14,
Seg9, Seg10, Seg6, and Seg5 are made to correspond to each other, and for the alphabet “A”, the segments Seg1 to Seg4, Seg7, Seg8, and Seg1
1 and Seg12 are associated with each other.

When recognizing a character, the CPU 24 reads, for example, the segments Seg14, Seg9, Seg1.
If it is determined that there is 0, Seg6, and Seg5, and there is no other segment, the character is recognized as “1”. Similarly, the identification number 3a assigned to the glass element 3
For each character, the presence or absence of a segment is determined to perform character recognition.

(5-2) Operation and Effect The operation of the glass element identification code reader when the above glass element 3 is used will be described.

Assuming that the identification number 3a of the glass element 3 is "A1234" as shown in FIG. 8, the optical image projected on the CCD 5 of the glass element 3 is as follows.
An image as shown in FIG. 13 is obtained. Then, when image data indicating such an image is stored in the frame memory 23 shown in FIG. 2, the CPU 24 shown in FIG. 2 recognizes the identification number 3a as follows.

First, the CPU 24 determines the identification number 3 of the width H1.
Recognize a. Here, since the width of each character is unified to two segments, that is, the width H2, the width H1 is divided by the width H2 to determine the number of characters. In this case, it is recognized that the identification number 3a is composed of five characters. Next, CP
U24 recognizes characters of width H2 from the head of the identification number 3a. At this time, the CPU 24 determines whether or not each character has 20 segments as described above,
Recognize the letter "A".

Similarly, the next width H2 is recognized.
Recognize the character "1". Hereinafter, "2", "3",
And "4".

As described above, in this embodiment, since the height and width of each character are all the same, there is no need to detect the height and width of each character. Further, it is not necessary to perform processing of detecting the end of each character and setting a character frame as in the related art. Therefore, in the present embodiment, it is only necessary to detect the presence or absence of a character and then determine the presence or absence of a segment for each character.

As described above, according to the present embodiment, the position detection and recognition of the character are facilitated, and the reading of the identification number 3a is performed at a high speed. In addition, since each character is represented by 20 regularly arranged segments, it can be easily recognized by a human.

(6) Other Embodiments The present invention is not limited to the above-described embodiments, and can be implemented with various modifications without departing from the scope of the invention. For example, in each of the above-described embodiments, the light is applied to almost the entire surface of the glass element 3, but the light is applied only to the periphery (for example, the lower half) to which the identification number 3a is attached. Is also good. Further, the identification code is not limited to the identification number as described above, and may be a symbol such as a barcode.

The photoelectric conversion means is not limited to the CCD, but may be another solid-state imaging device such as a MOS (Metal Oxide Silicon). Further, in each of the above-described embodiments, the case where the identification number 3a of the glass element 3 is read has been described. However, the present invention is not limited to the glass element used for the glass dosimeter, and may be used to identify a general glass element. Can be used.

In the first embodiment, the host device 26 is connected to the image processing device 22.
It is not always necessary to connect them, and they may operate independently.

Further, the engraving on the glass element is not limited to the method performed by the laser as described above, but may be performed by etching or engraving with a fine drill.

The number and arrangement method of the segments constituting each character of the identification number 3a are not limited to those described in the fifth embodiment, but can represent and represent numbers and alphabets. Any number and arrangement method may be used so that the characters have a shape that can be visually recognized by humans.

Further, the method of constructing the characters shown in the fifth embodiment is not limited to the case of the identification number 3a attached to the glass element 3, but may be similarly used for the identification code of an article which needs to be optically identified. Good.

[0062]

As described above, according to the present invention, the identification provided by shaving off a part of the surface of the dosimeter glass element without adversely affecting the measurement accuracy of the exposure dose. A clear image of the code can be obtained. for that reason,
The identification code can be clearly recognized by character recognition by image processing, and automatic reading of the identification code becomes possible.

Each character such as an identification code attached to the glass element of the dosimeter is constituted by a plurality of segments arranged according to a certain rule, and the number of each character in the height direction and the width direction is determined by all the segments. By unifying characters, it is possible to realize clarification of characters, simplification of a recognition method thereof, and speeding up.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a glass element identification code reader according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing the overall configuration of the glass element identification code reading device according to the embodiment;

FIG. 3 shows a glass element 3 used in the embodiment.
Perspective view showing an example of

FIG. 4 is a diagram showing an example of an image obtained in the embodiment.

FIG. 5 is a diagram showing a schematic configuration of a glass element identification code reader according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a schematic configuration of a glass element identification code reader according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a schematic configuration of a glass element identification code reader according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view showing an example of a glass element 3 to which an identification number 3a is given by a method for forming an identification code character according to a fifth embodiment of the present invention.

FIG. 9 is a diagram showing an example of a segment group constituting an identification number 3a of a glass element 3 used in the fifth embodiment.

FIG. 10 is a view showing segments constituting the segment group shown in FIG. 9;

FIG. 11 is a diagram showing an example in which numerals are represented by the segment group shown in FIG. 9;

FIG. 12 is a diagram illustrating an example in which alphabets are represented by the segment group illustrated in FIG. 9;

FIG. 13 is a diagram showing an example of an image obtained when the glass element 3 shown in FIG. 8 is used.

FIG. 14 is an exploded perspective view showing the configuration of a conventional glass dosimeter.

FIG. 15 is a view for explaining an example of a conventional method for expressing an identification code of a glass element.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 LED 2 lens 3 glass element 3 a identification number 4 lens 5 CCD 6 translucent mirror 20 CCD camera 22 image processing device 24 CPU

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01T 1/06 G06K 9/20

Claims (5)

(57) [Claims] A dosimeter glass element exposed to radiation.
And irradiates it with ultraviolet light from a N ₂ gas laser,
By detecting the amount of fluorescent light generated from the
Used in glass dosimeter readers to measure exposure dose
A glass element identification code reader for reading the identification code of a small dosimeter glass element with an identification code by shaving off a part of the surface, wherein a point light source irradiating the surface of the glass element with light; Among the light from the point light source, the identification of the glass element
A glass element identification code reader, comprising: light receiving means for receiving transmitted light transmitted through portions other than the code. 2. The method according to claim 1 , wherein said dosimeter glass element is exposed to radiation.
And irradiates it with ultraviolet light from a N ₂ gas laser,
By detecting the amount of fluorescent light generated from the
Used in glass dosimeter readers to measure exposure dose
A glass element identification code reader for reading the identification code of a small dosimeter glass element with an identification code by shaving off a part of the surface, wherein a point light source irradiating the surface of the glass element with light; Disposed between the point light source and the glass element, while transmitting the light emitted from the point light source to the glass element, the portion of the glass element other than the identification code
A glass element identification code reading device, comprising: a translucent reflecting mirror for reflecting light transmitted from a back surface of a glass element; and a light receiving means for receiving the light reflected by the translucent reflecting mirror. 3. An identification code of the glass element, wherein each character is constituted by a plurality of segments selected from a set of segments consisting of a fixed number of segments to be arranged at predetermined positions. The number of segments in the height direction and the number of segments in the width direction of each character are configured to be unified, and for each of the individual characters, the segment that constitutes the character is determined from any of the segments in the segment group. 3. The glass element identification according to claim 1 , wherein the character is recognized by determining whether the character is a character.
Code reader. 4. The identification code of the glass element is constituted by a plurality of segments in which each character is selected from a set of segments consisting of a fixed number of segments to be arranged at predetermined positions. 4. The apparatus according to claim 1 , wherein the number of segments in the height direction and the number of segments in the width direction of each character are displayed in a unified manner . 5. Glass element
Small dosimeter glass element used in a child identification code reader
Child. 5. The set of segment groups is divided into eight segments each forming a quadrangular frame having two in the height direction and two in the width direction, and four segments dividing the frame into four quadrangles. 5. The glass element identification code reader according to claim 4, wherein the glass element identification code reading device is constituted by 20 segments each consisting of one segment and two segments each forming a diagonal line with respect to each of the four rectangles.
Small dosimeter glass element used for.