JP2005201846A - Erroneous reading preventive mechanism for measuring instrument device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an erroneous reading preventive mechanism for a measuring instrument device precluded from the possibility of being flawed or deposited with dust to induce erroneous reading, and adopted easily to the various kinds of measuring instrument devices. <P>SOLUTION: The measuring instrument device is provided with a display part 9 for displaying or indicating a weighed value or a measured value, and a cover member 5 provided to cover the display part 9 and provided with a window hole 12 allowing perspective view of the display part 9. In the device, a transparent window material 14 is attached to the window hole 12, and a lens part 15 allowing magnification display is provided at least on an inner face opposed to the display part 9 in the window material 14. A surface of the lens part 15 is precluded from the possibility of contacting with foreign matter to be flawed and the possibility of being deposited with the dust, since the lens part 15 is formed on the inner face of the window material 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is used for measuring devices such as watt-hour meters, gas meters, water meters, and measuring devices such as voltmeters and ammeters, and displays or indicates measured values or measured values through a transparent window member. The present invention relates to a misread prevention mechanism of an instrument device configured to be able to visually recognize a display unit or the like.

  Meter devices such as watt-hour meters, gas meters, and water meters are configured so that the measured value displayed on the display unit can be seen at the time of meter reading. Used to determine the price. For this reason, in the meter reading by visual recognition, it is required to accurately read the measurement value displayed on the display unit, and it is necessary to avoid misreading. In particular, in instrument devices installed in difficult-to-see positions, there are cases where the meter is read using a reflecting mirror, etc. If the display on the display is small, it is difficult to clearly grasp the display contents .

  In addition, since not all meter readers are good at visual acuity and recognition power, clear display of display contents is necessary to prevent misreading by meter readers. Such a request is generated not only in a measuring device such as a watt hour meter but also in a measuring device such as a voltmeter or an ammeter.

  By the way, as a mechanism for clearly displaying the display contents, conventionally, the outer end surface of the window glass of the indicator case is formed in a convex lens shape, and the indication value of the indicator accommodated in the case is easy to see (Patent Literature 1) A convex lens is arranged on the upper part of the main body of the water meter through a glass plate, a metering window cap provided with a lens portion having a convex lens effect is provided on the metering window provided above the convex lens, and the convex lens and the metering window A scale that can be seen to be enlarged by a double enlargement action with the lens part of the cap (Patent Document 2), a transparent window member is provided in a display opening provided on the upper end surface of the cover, A window member formed in the shape of a convex lens so that the display unit can be viewed at a wide angle is considered (Patent Document 3).

  In addition, a transparent anti-fogging plate is placed between the upper part of the number wheel and the window glass, and a convex lens is formed on the anti-fog plate that is located at the upper part of the number wheel and has a smooth upper surface and a convex lower surface. A configuration that facilitates meter reading by enlarging and displaying the numbers of a number wheel is also known (Patent Document 4).

JP 2003-111339 A (see column 0028, FIG. 2) Japanese Patent Laid-Open No. 10-132737 (column 005, see FIG. 2) Japanese Patent Laid-Open No. 6-169523 (see column 0022, FIG. 1) Japanese Patent Laid-Open No. 11-230811 (see column 0014, FIG. 5)

  However, since the configuration according to Patent Documents 1 to 3 described above is configured to enlarge the display of the display unit by providing a lens unit that is convex to the outside of the instrument device, the convex surface of the lens unit is exposed to the outside. It is easily exposed and exposed to foreign matter, and is easily damaged. Further, when the convex surface of the lens portion is directed outward, dust tends to accumulate on the surface of the lens portion. For this reason, even though the lens unit is provided to ensure a clear display on the display unit, the lens unit is scratched or dust is attached, which makes it difficult to see and may cause misreading.

  Moreover, the structure of patent document 4 presupposes the peculiar structure which has arrange | positioned the fog prevention board between a number wheel and a window glass, and employ | adopts such a structure for various instrument devices. Is not realistic.

  The present invention has been made in view of the circumstances as described above, and there is no possibility that the lens portion is scratched or dust is attached to cause misreading, and can be easily adopted in various instrument devices. It is a main problem to provide a misreading prevention mechanism for a simple instrument device.

  In order to achieve the above object, a misreading prevention mechanism for an instrument device according to the present invention includes a display unit that displays or indicates a measured value or a measured value, and a window that is provided so as to cover the display unit and through which the display unit can be seen. A lens unit capable of displaying an enlarged image on at least an inner surface of the window member facing the display unit. (Claim 1).

  Therefore, the display of the display unit can be enlarged and displayed by the lens unit of the window member disposed so as to face at least in front of the display unit, and the display contents can be accurately grasped. In addition, since the lens portion is formed on the inner surface of the window member, there is no possibility of foreign matter coming into contact with the surface and scratching or dust adhering, and display on the display portion will not be mistaken.

  Here, the lens portion that can be magnified may be formed in a convex lens shape, a concave lens shape, or a Fresnel lens shape. Further, the lens part formed on the window member may be disposed directly opposite to the display part, but the instrument device includes an instrument body having a glass cover provided so as to cover the display part. In the case of including a cover member provided so as to cover the glass cover and having the window hole, the lens unit may be opposed to the display unit through the glass cover. 2). Even in such a configuration, at least the display unit can be enlarged and displayed by the lens unit, and the display content can be accurately grasped. In addition, since the glass cover is provided between the display unit and the lens unit, the distance between the display unit and the lens unit can be secured, and the thickness of the lens unit can be reduced.

  Further, the lens portion may be formed integrally with the window member, or may be formed separately and attached later (claims 3 and 4). In the former configuration, since the lens portion is molded at the same time as the window member is molded, there is no need for a work process for retrofitting the lens portion, and there is no need to finely adjust the position where the lens portion is provided, and a new manufacturing is performed. It is suitable for instrument devices. On the other hand, in the latter configuration, the lens portion can be retrofitted to the window member of the existing instrument device, so that it is not necessary to replace the instrument device, which is suitable for the existing instrument device.

  The above configuration is a cover member so as to cover a display unit where a measured value or a measured value is displayed or indicated, such as a measuring device such as a watt hour meter, a water meter, or a gas meter, or a measuring device such as a voltmeter or an ammeter. This is applicable to any instrument device in which a transparent window member is attached to the window hole of the cover member so that the display unit can be visually recognized through the window member. In the case of a meter, since it is necessary to visually check the display part and the instrument number (manufacturing number) at the time of meter reading, the lens part must be visually recognized at the time of meter reading including the display part. (Claim 5).

  As described above, according to the present invention, since the lens portion that can be enlarged and displayed is provided on at least the inner surface facing the display portion of the transparent window member attached to the window hole, the display portion including the display portion is provided. It is possible to zoom in on the display to accurately grasp the display contents, and it is possible to prevent foreign matter from coming into contact with the surface of the lens and scratching or dust from being attached. There is no fear of triggering. Furthermore, since the lens portion is provided on the inner surface of the window member, a special member for attaching the lens portion is not required, and the same configuration can be adopted for various instrument devices.

  Here, the lens portion of the window member may be disposed directly opposite to the display portion, or may be disposed oppositely through the glass cover. In the latter configuration, at least the glass cover is provided. Since the distance between the display unit and the lens unit is ensured by the amount of interposition, the thickness of the lens unit can be reduced.

  In addition, if the lens part is formed integrally with the window member, a work process for retrofitting the lens part to the window member becomes unnecessary, and it is not necessary to finely adjust the position of the lens part. It becomes possible to avoid misreading.

  On the other hand, if the lens part is formed separately from the window member and is retrofitted to the window member, the lens part can be added even to an existing instrument device that does not have a lens part. This eliminates the need to replace the instrument device.

  Furthermore, when it is necessary to visually recognize the identification number of the instrument device in addition to the display unit at the time of meter reading, such as an watt-hour meter, all the items that need to be visually confirmed at the time of meter reading including the display unit are included. By providing it so as to face this part, it becomes possible to accurately visually recognize all information necessary for meter reading.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best embodiment of the present invention will be described below with reference to the accompanying drawings.

  In FIG. 1 thru | or FIG. 3, the case where the watt-hour meter 1 is used as an example of a meter apparatus is shown. In this example, the watt-hour meter 1 is configured by storing a meter 2 in a storage box 3, and the storage box 3 is configured by a base 4 made of a synthetic resin having insulation and a cover member 5. Has been.

  The base 4 has a measuring instrument 2 attached to the front surface thereof by means such as screwing, and allows an electric wire connected to the measuring instrument 2 to be inserted from the back side to the front side. The measuring instrument 2 attached to the base is a publicly known instrument that houses a measuring instrument body 7 inside a glass cover 6, and a nameplate 8 and a measuring panel 9 are arranged on the front face of the measuring instrument body 7. It is.

  The nameplate 8 displays a type code, a model approval number, a rated voltage, a rated current, a rated frequency, a meter constant specific to the meter, a manufacturing number 10 for identifying the meter body 7, and the like in this example. A display hole 11 is formed to the extent, and a current-type weighing board 9 made of a liquid crystal display faces the display hole 11. A display unit for displaying the measured value is configured by the weighing panel 9 that can be visually recognized through the display hole 11.

  The cover member 5 is of an opaque color formed in a substantially rectangular parallelepiped shape with an open back surface, and is provided so as to be detachably mounted on the front surface of the base 4 so as to cover the measuring instrument 2. A window hole 12 through which the nameplate 8 and the weighing board 9 can be seen is formed on the front surface of the cover member 5. In this example, the window hole 12 extends substantially vertically so that the entire instrument body 7 can be seen through. It is formed in a shape.

  A transparent window member 14 made of a glass plate or a synthetic resin plate is attached to the window hole 12 by a holding frame 13 provided at the hole edge from the inside of the cover member 5. A lens portion 15 formed in a convex lens shape is integrally provided on the inner surface of the window member 14. The lens portion 15 is long at a portion facing at least the weighing plate 9 through the glass cover 6, in this example, at a portion facing the weighing plate 9 and the display portion of the serial number 10 that need to be visually recognized at the time of meter reading. It is formed in a circular shape.

  Here, the lens unit 15 may be configured such that the thickness of the central portion is maximized and the thickness is gradually decreased in the peripheral portion so that the display of the weighing plate 9 and the serial number are enlarged when viewed from the front. However, since the watt-hour meter 1 is installed at a height of 1.8 m to 2.2 m from the ground, the display of the weighing panel 9 and the display of the serial number 10 are enlarged when viewed from below. As described above, the thickness of the lens unit 15 may be adjusted.

  Therefore, in the above-described configuration, the display of the weighing board 9 and the serial number 10 that need to be visually recognized at the time of meter reading are enlarged and displayed by the lens unit 15, so that the display part can be accurately recognized and erroneous reading is prevented. It becomes possible.

  Further, since the lens portion 15 is provided on the inner surface of the transparent window member 14 provided in the window hole 12, the lens portion 15 does not come into contact with foreign matter from the outside and is not damaged, and dust accumulates on the lens portion. Therefore, the display of the weighing board 9 and the serial number 10 are difficult to see due to scratches and dust, and there is no risk of misreading.

  In particular, in an instrument device in which the cover member 5 can be attached and detached as described above, the cover member 5 may be temporarily removed and placed with the surface facing downward. Since it is formed on the inner surface of the window member 14, there is no inconvenience of damaging or damaging the lens surface.

  Furthermore, in the above-described configuration, since the lens portion 15 is formed integrally with the window member 14, a work process for retrofitting the lens portion 15 to the window member 14 is not required, and the position of the lens portion 15 is finely adjusted. Therefore, it is possible to avoid misreading the display section due to poor attachment.

  In the above configuration, the lens unit 15 is formed integrally with the window member 14, but the lens unit 15 may be formed separately and attached later with an adhesive or the like. According to such a configuration, it becomes possible to enlarge the display unit and the like by attaching the lens unit to an existing instrument device that is not provided with a lens unit, and there is no need to replace the existing instrument device. In the above-described configuration, an example in which the lens portion is formed in a convex lens shape has been shown. However, as long as the display can be enlarged, it may be formed in a concave lens shape or a Fresnel lens shape.

  Moreover, in the above-mentioned structure, the case where the watt-hour meter 1 was used as an example of the meter device was shown, but the display unit for displaying the measurement value and the display unit are covered like a gas meter or a water meter. The same configuration is adopted in the cover member having the provided window hole and the other weighing device in which a transparent window member is attached to the window hole and the display unit or the like can be visually recognized through the window member. It is possible.

  Further, in the above-described configuration, the lens unit 15 is provided so as to face the weighing plate 9 that needs to be visually recognized through the glass cover 6 and the display location of the serial number 10, but the weighing unit displays the measurement value. Even if the lens part is provided so as to face only the board, the lens part 15 may be provided so as to face directly to a place where visual recognition is required without the glass cover 6 interposed. In addition, the size and shape of the lens unit 15 may be changed as appropriate in accordance with a location where visual recognition is required.

  In the above configuration, an example of a metering device such as a watt hour meter is shown, but the same configuration may be adopted for a window member of a measuring device such as a voltmeter or an ammeter. For example, as shown in FIG. 4, a display unit 17 that indicates a measurement value by a pointer 16 and a cover member 19 that is provided so as to cover the display unit 17 and includes a window hole 18 that can be seen through the display unit 17. In addition, a lens portion 22 that can be enlarged and displayed on the inner surface of the window member 20 facing the display portion 17 may be provided for the voltmeter 21 in which the transparent window member 20 is mounted in the window hole 18. Specifically, as shown in the figure, the lens portion 22 may be formed in an arc shape so as to face the display portion of the scale 23 on which the pointer 16 moves.

  INDUSTRIAL APPLICABILITY The present invention can be used for various instrument devices that visually recognize a display unit through a transparent window member provided in the window unit, and is used for devices in various industrial fields that use such instrument devices. It is possible.

FIG. 1 is a perspective view showing a watt-hour meter as an instrument device according to the present invention. 2 is a side sectional view of the watt-hour meter of FIG. FIG. 3 is a front view of the watt hour meter, FIG. 3 (a) is a front view showing a state where the cover member of the watt hour meter is removed, and FIG. 3 (b) is a state where the cover member is attached. It is a front view which shows the state. FIG. 4 is a front view of the voltmeter.

Explanation of symbols

5, 19 Cover member 6 Glass cover 9 Weighing panel (display part)
12, 18 Window hole 14, 20 Window member 15, 22 Lens part 17 Display part

Claims (5)

A display unit that displays or indicates a measured value or a measured value, and a cover member that is provided so as to cover the display unit and has a window hole that allows the display unit to be seen, and a transparent window member is attached to the window hole In the instrument device configured as
A misreading prevention mechanism for an instrument device, wherein a lens portion formed in a convex lens shape is provided on at least an inner surface of the window member facing the display portion. The instrument device includes an instrument body having a glass cover provided to cover the display unit, and a cover member provided to cover the glass cover and having the window hole, and the lens unit includes the lens unit 2. A misreading prevention mechanism for an instrument device according to claim 1, wherein the mechanism is disposed opposite to the display unit via a glass cover. 3. The erroneous reading prevention mechanism for an instrument device according to claim 1, wherein the lens portion is molded integrally with the window member. 3. The erroneous reading prevention mechanism for an instrument device according to claim 1, wherein the lens portion is molded separately from the window member and attached later. 2. The meter device according to claim 1, wherein the meter device is a watt hour meter, and the lens unit is provided so as to be opposed to all the portions that require visual recognition at the time of meter reading including the display unit. 2. A reading error prevention mechanism for the instrument device according to 2.

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