JP2005069960A - Electronic type dosemeter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance vibration resistance, impact resistance and noise resistance for an electronic dose meter. <P>SOLUTION: This electronic dosemeter 100 is provided with an upper case 1, a lower case 2, a substrate 4 provided inside the upper case 1 and the lower case 2, a key switch 11 provided in the substrate 4, a radiation detecting part 9 provided in the substrate 4, a light emitting part 7 provided in the substrate 4, and cushioning members 3, 5 for sandwiching the substrate 4. The cushioning members 3, 5 has rolls of a vibration control function for the substrate 4, a roll as a key pad for the key switch 11 and a reflecting face 8 for reflecting light emitted from the light emitting part 7 to be guided to the outside of the case, in common. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic dosimeter for measuring an individual dose and work time.

  In general, a portable electronic device stores a substrate, a key input unit, a display unit, a power source, and the like in a plastic case. Since such an electronic device is carried and used by an operator, a malfunction or failure of a component may occur due to vibration during movement or impact caused by dropping. Furthermore, waterproofness may be reduced due to deformation of the case. In this way, vibrations and shocks applied to the device cause malfunctions and failures of the device.

As a structure that improves the vibration resistance and shock resistance of electronic devices, it is made of an elastic material in a structure that houses digital multimeter members (liquid crystal panels, batteries, shield plates, crystal resonators, fuses, etc.) in the case. A method is known in which each member is pressed against the case side by the elastic protrusion and firmly fixed, thereby preventing the component from being removed from a predetermined position (see, for example, Patent Document 1).
JP-A-7-270457 (page 4-9, FIG. 1-10)

  However, since the digital multimeter and the electronic dosimeter have different usage conditions, the configuration of the digital multimeter cannot be applied to the electronic dosimeter as it is. The difference in usage between the digital multimeter and the electronic dosimeter will be described.

  The digital multimeter has a crystal resonator as a member sensitive to vibration and impact. However, when the digital multimeter is used (when the power is turned on), it is supposed to be used in a horizontal and stable place, and it is unlikely to receive vibration during use.

  On the other hand, in the case of an electronic dosimeter equipped with a radiation detection unit, an operator is required to work with the electronic dosimeter attached to the front of the left chest. When the electronic dosimeter is used (when the power is turned on), fine vibrations are always generated with the movement of the worker and the work operation. In addition, since an operator may use a tool that generates strong vibration such as a drill or a grinder, momentary but strong vibration may be applied to the electronic dosimeter. When vibration is applied, an error such as detection of radiation occurs even if radiation is not detected, so it is necessary to prevent vibration from being applied to the radiation detection unit. This is very important because electronic dosimeters measure the radiation received by the human body.

  As described above, an electronic dosimeter needs to satisfy vibration resistance and impact resistance during use.

  In view of the above-described conventional problems, the present invention is to improve the vibration resistance and impact resistance of an electronic dosimeter, and to provide a structure of an electronic dosimeter that reduces manufacturing costs and assembly man-hours. Objective.

To achieve the above object, an electronic dosimeter of the present invention includes a case, a substrate provided in the case, a key switch provided on the substrate, and a radiation detection unit provided on the substrate. A light-emitting unit provided on the substrate, and a buffer member that sandwiches the substrate. The buffer member functions as an anti-vibration function of the substrate, the role of the keypad of the key switch, and the light emitted from the light-emitting unit. It also has the role of a reflecting member that reflects and guides it out of the case.

  According to this configuration, the number of members can be reduced by adding the role of the keypad and the role of the reflecting member to the buffer member. Also, by combining the three members into one, the total manufacturing cost can be reduced and the number of assembling steps at the time of assembling the members can be reduced.

  In addition, the buffer member of the electronic dosimeter of the present invention has a notch, and the buffer member sandwiches the substrate without being in contact with the radiation detection unit.

  According to this configuration, since the radiation detection unit and the case are not in direct contact with each other, it is possible to prevent vibrations, shocks, and noises oscillated from the case from reaching the radiation detection unit directly.

  The buffer member of the electronic dosimeter of the present invention is made of silicon.

  According to this configuration, the use of silicon makes it easy to form the buffer member, and the color can be selected, so that the function of the reflecting member can be added to the buffer member.

  As described above, according to the present invention, the vibration resistance and shock resistance of the electronic dosimeter can be improved by preventing the vibration and shock applied to the case from directly reaching the radiation detection unit. In addition to reducing the number of members of the electronic dosimeter, it is possible to reduce the number of parts manufacturing costs and the number of assembly steps when assembling the members.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.

  FIG. 1 is an assembly configuration diagram of a lower case unit of an electronic dosimeter.

  In FIG. 1, reference numeral 2 denotes a lower case of the electronic dosimeter 100, and reference numerals 4, 5, and 15 denote a substrate housed in the case, a rubber member as a buffer member, and a battery part, respectively.

  The lower case 2 is provided with an opening 13 and an IrDA communication window 17. The IrDA communication cover 18 is bonded to the IrDA communication window 17.

  On the substrate 4, at least a light emitting unit 7, a radiation detection unit 9, an IrDA communication unit 16, and a key switch 11 are mounted. The key switch 11 is mounted on the back surface of the substrate 4. Moreover, as the light emission part 7, LED, a light bulb, etc. are used as an example.

  The lower rubber 5 is made of, for example, silicon as an elastic body, has an impact absorption capability, and has a vibration isolating function. Under the rubber 5, a spacer 12 for the key switch 11 and a clamping part 30 are provided. The spacer 12 is in a position that coincides with the key switch 11 provided on the substrate 4 and the opening 13 of the lower case 2. The spacer 12 provided on the lower case 2 passes through the opening 13 as a key top. Projects to the outside of the lower case 2. Further, the clamping part 30 under the rubber 5 is for clamping the substrate 4 and forms a projection shape. When the electronic dosimeter 100 is assembled and completed, the clamping unit 30 is sandwiched between the lower case 2 and the substrate 4, and as a result, the substrate 4 is clamped by the clamping unit 30, that is, the lower rubber 5.

  The state of holding the substrate 4 will be described later with reference to FIG.

  Next, the assembly order of the lower case unit of the electronic dosimeter will be described.

  First, the assembler places the rubber lower part 5 on the lower case 2 at a predetermined position.

  Next, the assembler places the battery part 15 on the rubber lower part 5 at a predetermined position, and fixes the battery part 15 with the mounting screw 14. The battery unit 15 is fixed to the lower case 2 by fixing the battery unit 15 with the mounting screw 14.

  Next, the assembler places the substrate 4 on a predetermined position on the lower rubber 5. The substrate 4 is merely placed on the rubber lower part 5 and is not fixed by the mounting screw 14 via the battery part 15.

  Next, the assembler adheres the IrDA communication cover 18 to the IrDA communication window 17 of the lower case 2. By bonding the IrDA communication cover 18, the IrDA communication part 16 of the substrate 4 is covered with the IrDA communication cover 18, so that the substrate 4 is temporarily fixed and is made of the above-described members as shown in FIG. Even if the lower case unit 22 is turned upside down, it will not fall easily.

  Thus, the lower case unit 22 is assembled.

  Next, the incorporation of the LCD into the lower case unit 22 will be described with reference to FIG.

  FIG. 2 is an assembly configuration diagram in which the LCD is incorporated in the lower case unit of the electronic dosimeter. In FIG. 2, 20 is an LCD cover, and 19 and 21 are an LCD and an LCD display sheet set between the LCD cover 20 and the lower case unit 22. The LCD display sheet 21 is used for decorating the LCD 19. The LCD cover 20 is processed into a pocket shape so that the LCD 19 and the LCD display sheet 21 can be set, and can be set simply by inserting from above.

  Next, the assembly order of the LCD will be described.

  First, the assembler fits the LCD cover 20 into a predetermined position of the lower case unit 22.

  Next, the assembler inserts the LCD 19 and the LCD display sheet 21 into predetermined positions on the LCD cover 20.

  Next, the assembler connects a connection cable (not shown) of the LCD 21.

  This completes the incorporation of the LCD.

  Next, assembly of the upper case unit will be described.

  FIG. 3 is an assembly configuration diagram of the upper case unit of the electronic dosimeter.

  Reference numeral 1 denotes an upper case of the electronic dosimeter 100, and reference numerals 3 and 23 denote a rubber top and a buzzer housed in the case. The upper case 1 is provided with a buzzer mounting portion 24.

Further, the upper rubber 3 is made of, for example, silicon as an elastic body, has an impact absorption capability, and has a vibration isolating function. On the rubber top 3, a reflecting surface 8, a notch portion 10, and a clamping portion 30 are provided. Since the reflecting surface 8 is located at a position that coincides with the light emitting portion 7 of the substrate 4 and has a shape surrounding the light emitting portion 7, the light emitted from the light emitting portion 7 is effective outside the electronic dosimeter 100. It has a function as a reflecting member that reflects light.

  The reflective surface 8 on the rubber 3 may be formed using, for example, white silicon in order to increase the reflectance of light. For example, aluminum is deposited on the reflective surface 8 as a metal material having a high light reflectance. May be.

  The shape of the reflecting surface 8 will be described in detail with reference to FIG.

  Further, the notch 10 is provided at a position that coincides with the radiation detection unit 9 provided on the substrate 4. And this notch part 10 prevents that the upper case 1 and the radiation detection part 9 contact directly. The clamping part 30 is for clamping the board | substrate 4, and forms the protrusion shape. When the assembly of the electronic dosimeter 100 is completed, the sandwiching portion 40 is sandwiched between the upper case 3 and the substrate 4, and as a result, the substrate 4 is sandwiched between the sandwiching portion 40, that is, the rubber top 3.

  In addition, the state which clamps the board | substrate 4 is demonstrated later using FIG.

  Next, the assembly order of the upper case unit will be described.

  First, the assembler sets the buzzer 23 at a predetermined position of the upper case 1.

  Next, the assembler places the rubber top 3 at a predetermined position of the upper case 1.

Next, the assembler connects the connection cable (not shown) of the buzzer 23. Thus, the assembly of the upper case unit is completed.

  Next, the incorporation of the upper case unit 27 into the lower case unit 22 of the electronic dosimeter will be described.

  FIG. 4 is an assembly configuration diagram in which the upper case unit 27 is incorporated in the lower case unit 22 of the electronic dosimeter.

  As described with reference to FIGS. 1 and 2, the lower case unit 22 includes the substrate 4, the lower rubber 5, the battery unit 15, the LCD cover 20, and the like. As described with reference to FIG. 3, the upper case unit 27 includes the buzzer 23 and the rubber upper 3.

  Next, the assembly order will be described.

  First, the assembler places the lower case unit 22 at a predetermined position of the upper case unit 27 and fixes it with the mounting screw 34.

Next, the assembler sets the battery 25 in the lower case unit 22 and attaches the battery cover 26 to the lower case unit 22. As described above, the lower case unit 22 and the upper case unit 27 are integrated to complete the electronic dosimeter. To do.

  FIG. 5 is an external view when the electronic dosimeter is assembled.

  The spacer 12 under the rubber 5 passes through the opening 13 and protrudes to the outside of the lower case 2. The rubber lower portion 5 has a spacer 12 to have a keypad function.

  The electronic dosimeter 100 is composed of five components, ie, an upper case 1, a rubber upper 3, a substrate 4, a rubber lower 5, and a lower case 2 as large components. Further, in the assembly process, the lower case unit 22 and the upper case unit 27 are included. The two units are integrated and assembled.

  Note that A-A ′ in FIG. 5 indicates the position of the cross section in FIG. 6.

  FIG. 6 is a cross-sectional view when the electronic dosimeter is completed, and shows a cross section taken along line A-A ′ in FIG. 5.

  In FIG. 6, the substrate 4 is sandwiched and fixed by sandwiching portions 30 and 40 provided on the upper rubber 3 and the lower rubber 5.

  Further, the rubber top 3 is provided with a notch 10 at a position corresponding to the radiation detection unit 9, so that the upper case 1 and the radiation detection unit 9 are integrated even when the lower case unit 22 and the upper case unit 27 are integrated. Is prevented from coming into direct contact, so that vibrations and impacts applied to the upper case 1 are prevented from reaching the radiation detector 9 directly, so that it is possible to prevent erroneous detection that radiation has been measured by vibration. it can.

  A spacer 12 for the key switch 11 is provided under the rubber 5. The spacer 12 is located at a position that coincides with the key switch 11 of the substrate 4 and the opening 13 of the lower case 2, passes through the opening 13 as a key top, protrudes to the outside of the lower case 2, and has a keypad function. . In this way, by using the rubber lower part 5 as a buffer member also as a keypad, it is not necessary to use a separate keypad, and the number of parts and the number of assembly steps can be reduced.

  Next, the reflecting surface 8 provided on the rubber top 3 will be described with reference to FIG. FIG. 7 is an enlarged view of a portion where the reflecting surface 8 is provided.

  In FIG. 7, a reflective surface 8 is provided on the rubber top 3, and the reflective surface 8 has a shape that surrounds the light emitting portion 7 provided on the substrate 4 and is open to the outside of the upper case 1. . Thereby, the light emitted from the light emitting unit 7 is reflected by the reflecting surface 8 and is irradiated to the outside of the upper case 1 (not shown). The arrow indicates the direction in which the light travels. A part of the upper case 1 is transparent to transmit light.

  As described above, the rubber top 3 serving as a buffer member has a buffer function, a role as a keypad, and a function as a reflecting member, thereby suppressing the transmission of vibration to the radiation detection unit 9 and thereby causing a radiation error. Detection can be prevented, and the number of man-hours can be reduced at low cost.

  The electronic dosimeter of the present invention can prevent vibrations and shocks applied to the case from reaching the radiation detector directly. Furthermore, since the number of members of the electronic dosimeter can be reduced and the manufacturing cost of parts and the number of assembly steps at the time of assembling the members can be greatly reduced, this is useful for electronic dosimeters and the like.

Assembly diagram of lower case unit of electronic dosimeter according to Embodiment 1 of electronic dosimeter of the present invention Assembly diagram for assembling LCD in lower case unit of electronic dosimeter according to Embodiment 1 of electronic dosimeter of the present invention Assembly diagram of the upper case unit of the electronic dosimeter according to Embodiment 1 of the electronic dosimeter of the present invention Assembly diagram for assembling the upper case unit into the lower case unit of the electronic dosimeter according to Embodiment 1 of the electronic dosimeter of the present invention External view at the time of completion of the electronic dosimeter according to Embodiment 1 of the electronic dosimeter of the present invention Sectional drawing at the time of completion of the electronic dosimeter in Embodiment 1 of the electronic dosimeter of this invention The enlarged view of the reflective surface in Embodiment 1 of the electronic dosimeter of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3 Rubber top 4 Board | substrate 5 Rubber bottom 6 Liquid crystal display part 7 Light emission part 8 Reflecting surface 9 Radiation detection part 10 Notch part 11 Key switch 12 Spacer for key switches 13 Opening part 14 Mounting screw 15 Battery part 16 IrDA communication section 17 IrDA communication window 18 IrDA communication cover 19 LCD
20 LCD cover 21 LCD sheet 22 Lower case unit 23 Buzzer 24 Buzzer mounting part 25 Battery 26 Battery cover 27 Upper case unit 30 Holding part 34 Mounting screw 100 Electronic dosimeter

Claims (3)

A case, a substrate provided in the case, a key switch provided on the substrate, a radiation detection unit provided on the substrate, a light emitting unit provided on the substrate, and a buffer sandwiching the substrate The buffer member has an anti-vibration function of the substrate, a role of a keypad of the key switch, and a role of a reflection member that reflects the light emitted from the light emitting part and guides it out of the case Dosimeter. The electronic dosimeter according to claim 1, wherein the buffer member has a notch, and the buffer member sandwiches the substrate without contacting the radiation detection unit. The electronic dosimeter according to claim 1 or 2, wherein the buffer member is made of silicon.

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