JP2009264745A - Indicating instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indicating instrument device capable of obtaining a sufficient suction force and suppressing overshoot and pulsation of a pointer.
In an indicating instrument device, a display panel 21 includes a translucent first display panel 21a and a second display panel 21b disposed behind the first display panel 21a with a space therebetween. Have A shaft portion 23 having a main shaft 23a penetrating the first display plate 21a and the pointer 22 being disposed and fixed, and a main bearing portion 23b disposed on the first display plate 21a and rotatably supporting the main shaft 23a; A first magnet 23c provided on the main shaft 23a so as to be positioned between the first display board 21a and the second display board 21b, and a first driving means provided on the pointer driving means so as to face the first magnet 23c. A second magnet 24a. The pointer 22 is rotated in conjunction with the rotational driving of the pointer driving means by the attractive force of the first and second magnets 23c and 24a.
[Selection] Figure 2

Description

  The present invention relates to an indicating instrument device for indicating an indicator portion of a display board with a pointer.

  Conventionally, there is an indicating instrument device that indicates an indicator portion of a dial plate (display plate) with a pointer. Such an indicating instrument device directly fixes the pointer on a rotating shaft of a pointer driving means such as a stepping motor, and rotates the pointer in conjunction with the rotational driving of the pointer driving means to indicate the indicator section. Is.

However, in such a configuration, a punching step for forming a through hole in the dial for penetrating the rotating shaft is required, and the manufacture of the dial becomes complicated, so that the dial cannot be manufactured at low cost. Had the problem. In particular, when a variable display element such as a liquid crystal display element is used as a dial as disclosed in Patent Document 1, a through-hole must be formed in the glass substrate of the variable display element. Had the problem of becoming higher.
Japanese Utility Model Publication No. 3-44624 JP 2003-161650 A

  In order to solve this problem, the applicant of the present application provides a first magnet for the pointer in Patent Document 2 and a second magnet for the pointer driving means to obtain the magnetic force (attraction force) of the first and second magnets. Suggests an indicating instrument device that rotates the pointer in conjunction with the rotational drive of the pointer driving means. According to such a configuration, it is not necessary to form a through hole in the display board, and the dial can be easily and inexpensively manufactured.

  However, simply disposing the first magnet partially on the pointer as disclosed in Patent Document 2 (in Patent Document 2, two first magnets are disposed), When the suction force for fixing the pointer is insufficient, an overshoot that exceeds the indicated position occurs when the pointer is rotated to indicate a predetermined indicated position, and when the pointer is stepped There is a possibility of causing pulsation of the pointer, and there is room for further improvement as an indicating instrument device.

  The present invention has been made in view of the above-described problems, and in an indicating instrument device that fixes a pointer and a pointer driving means by a magnetic attraction force, a sufficient attraction force is obtained to suppress overshoot and pulsation of the pointer. An object of the present invention is to provide an indicating instrument device that can perform the above-described operation.

  In order to solve the above problems, the present invention provides a display plate, a pointer provided on the front surface side of the display plate, a pointer driving means provided on the rear surface side of the display plate for rotating the pointer, The display instrument has a translucent first display panel and a second display panel disposed behind the first display panel with a space therebetween. A shaft portion having a main shaft that passes through the first display plate and the pointer is disposed and fixed; and a main bearing portion that is disposed on the first display plate and rotatably holds the main shaft; A first magnet provided on the main shaft so as to be positioned between the first display plate and the second display plate, and a second provided on the pointer driving means so as to face the first magnet. The pointer is driven to rotate the pointer drive means by the attractive force of the first and second magnets. Moving to and wherein the pivoting.

  In addition, a yoke is disposed on a surface of the first magnet that is not opposed to the second magnet.

  The first and second magnets are characterized in that a plurality of S poles and N poles are alternately magnetized.

  Further, the first and second magnets are two-pole magnetized on opposite surfaces.

  The pointer may include a light receiving unit that receives illumination light emitted from behind the pointer and shines the pointer.

  The illumination means for emitting the illumination light is disposed on the first display panel.

  Further, a bearing portion joined to the shaft portion of the pointer driving means is provided, and the second magnet is provided in the bearing portion.

  The second magnet is formed integrally with the bearing portion.

  Further, the second display panel includes a variable display element including a variable display unit instructed by the pointer.

  The present invention relates to an indicating instrument device that fixes a pointer and a pointer driving means by means of a magnet's attractive force, and can obtain a sufficient attractive force to suppress overshoot and pulsation of the pointer. .

  Hereinafter, a first embodiment in which the present invention is applied to a vehicle combination meter will be described with reference to the accompanying drawings.

  In FIG. 1, 1 is a housing. The housing 1 has a turning member and a case body, and stores three indicator meters, that is, a speedometer 2, a fuel gauge 3, and a water temperature gauge 4. The speedometer 2 is larger than the fuel gauge 3 and the water temperature gauge 4 and is disposed between the fuel gauge 2 and the water temperature gauge 4. The speedometer 2 has a display board 21 and a pointer 22. Further, the fuel gauge 3 and the water temperature gauge 4 have dial plates 31 and 41 and pointers 32 and 42, respectively. The dial plates 31 and 41 are formed by printing a light shielding portion on a substrate made of a translucent resin (for example, polycarbonate) except for the indicator portions 3a and 4a. The hands 32 and 42 are rotated by a stepping motor (not shown) to indicate the indicator portions 3a and 4a of the dial plates 31 and 41.

  FIG. 2 is an enlarged sectional view of a main part. The speedometer 2 includes a display board 21, a pointer 22, a shaft portion 23, a bearing portion 24, and a stepping motor 25. Reference numeral 26 denotes a circuit board, and a stepping motor 25 is mounted on the circuit board 26.

  The display board 21 is composed of a translucent substrate 21a that is a first display board and a liquid crystal display element (variable display element) 21b that is a second display board.

  The translucent substrate 21a is made of a translucent resin (for example, acrylic or polycarbonate), and is provided with a shaft portion to be described later for rotatably holding the pointer 22.

  The liquid crystal display element 21b is obtained by bonding polarizing plates to both surfaces of a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates on which a transparent electrode film is formed. For example, the liquid crystal display element 21b is a dot matrix type liquid crystal display element. . The liquid crystal display element 21b can change the display content, and can display at least the indicator portion 2a and the character portion 2b. The liquid crystal display element 21b is disposed behind the translucent substrate 21a with a predetermined interval.

  The pointer 22 has a pointer main body 22a and a pointer cap 22b, and indicates the indicator portion 2a displayed on the liquid crystal display element 22a.

  The pointer main body 22a is made of a translucent resin such as polycarbonate, and a pointer cap 22b is fitted in the center of rotation. The pointer main body 22a includes a light receiving portion 22a1 for receiving illumination light from an LED (illuminating means) 27 disposed on the translucent substrate 21a and causing the pointer main body 22a to shine.

  The pointer cap 22b is formed by forming a non-translucent resin such as an ABS resin into a substantially cylindrical shape. In addition, an insertion portion 22b1 for inserting a later-described main shaft 23a is provided at the center of the pointer cap 22b.

  The shaft portion 23 is disposed on the translucent substrate 21a, and includes a main shaft 23a that rotatably supports the pointer 22, a main bearing portion 23b that fixes the main shaft 23a to the translucent substrate 21a, and a main shaft. A first magnet 23c and a first yoke 23d provided on the head 23a.

  The main shaft 23a is a substantially columnar member provided so as to pass through a hole 21a1 formed at a substantially central portion of the translucent substrate 21a and protrude forward and rearward of the translucent substrate 21a. The pointer 22 is fixed to the front surface side of the conductive substrate 21a, and becomes the center of rotation of the pointer 22.

The main bearing portion 23b is disposed in the hole portion 21a1 of the translucent substrate 21a, has a hole portion 23b1 into which the main shaft 23a is inserted at the center portion, and rotatably holds the main shaft 23a.

  In addition, a first magnet 23c and a first yoke 23d are provided at a portion of the main shaft 23a protruding rearward of the light transmitting substrate 21a so as to be positioned between the light transmitting substrate 21a and the liquid crystal display element 21b. It has been. The first magnet 23c and the first yoke 23d are each formed in a ring shape, and are disposed and fixed to the main shaft 23a via a magnet receiving portion 23e. The magnet receiver 23e has a hole 23e1 into which the main shaft 23a is inserted. The main shaft 23a, the main bearing portion 23b, and the magnet receiving portion 23e constituting the shaft portion 23 are made of a nonmagnetic material such as aluminum or brass.

  The first magnet 23c is formed in a ring shape, and a plurality of S poles and N poles are alternately magnetized as shown in FIG. In this embodiment, four poles are magnetized. The first magnet 23c attracts each other with a second magnet 24a described later. The first magnet 23c is made of, for example, a neodymium-iron-boron rare earth magnet or a samarium-cobalt rare earth magnet. In addition, the shape of the first magnet 23c may be, for example, a circular shape.

  The first yoke 23d is formed in a ring shape and is provided on the surface (non-opposing surface) side of the first magnet 23c that does not face the second magnet 24a. The first yoke 23d constitutes a magnetic circuit that suppresses leakage magnetic flux from the non-opposing surface side of the first magnet 23c and improves magnetic efficiency.

  The bearing portion 24 has a second magnet 24a and a second yoke 24b, and is fitted to the rotating shaft 25a of the stepping motor 25. The pointer driving means in this embodiment includes a bearing portion 24 and a stepping motor 25.

  The 2nd magnet 24a is arrange | positioned in the position which opposes the 1st magnet 23c through the liquid crystal display element 21b so that it may become a pair with the 1st magnet 23c. Although not shown, the second magnet 24a is also formed by alternately magnetizing a plurality of S and N poles in the same manner as the first magnet 23c. As a method for providing the second magnet 24a, a method may be used in which the bearing portion 24 is formed of a plastic magnet, and a portion facing the first magnet 23c is magnetized, or the bearing portion 24 is formed. Alternatively, the second magnet 24a may be provided as a separate member and integrally formed by insert molding or outsert molding. In that case, the second magnet 24a is formed of the same material as the first magnet 23c.

  The 2nd yoke 24b is provided in the surface (non-facing surface) side which does not oppose the 1st magnet 23c of the 2nd magnet 24a. The second yoke 24b constitutes a magnetic circuit that suppresses leakage magnetic flux from the non-opposing surface of the second magnet 24a and improves magnetic efficiency.

  In the present embodiment, the first magnet 23c is provided on the pointer 22 side, and the second magnet 24a is fixed to the rotating shaft 24a of the stepping motor 25 so as to face the first magnet 23c via the liquid crystal display element 21b. Since the first magnet 23c and the second magnet 24a attract each other by magnetic force, the main shaft 23 is rotated in conjunction with the rotational drive of the stepping motor 25, and the pointer 22 is rotated. Can be moved. Therefore, it is not necessary to form a through hole in the liquid crystal display element 21b of the display panel 21 as in the conventional method of directly fixing the pointer to the stepping motor, and the display panel 21 can be manufactured at a relatively low cost.

  Furthermore, by disposing the first magnet 23c on the main shaft 23a located behind the pointer 22, the distance from the second magnet 24a can be shortened compared to providing the first magnet 23c on the pointer 22. Thus, it is possible to obtain a sufficient suction force for fixing the pointer 22 and suppress overshoot and pulsation of the pointer 22. In addition, since the space for providing the first magnet 23c in the pointer 22 is not required, the shape and size of the pointer 22 are not limited, and the degree of freedom in design can be improved.

  Further, the first magnet 23c is formed in a ring shape in which a plurality of N poles and S poles are alternately magnetized, and is disposed so as to surround the main shaft 23a that is the center of rotation of the pointer 22, thereby rotating the pointer 22 An attractive force with the second magnet 24a can be obtained with respect to the entire central portion, and overshoot and pulsation of the pointer 22 can be suppressed. Further, by providing the first yoke 22d on the non-opposing surface side of the first magnet 23c with the second magnet 24a, the magnetic efficiency is improved, and even when the same first magnet 23c is used, the attractive force is further increased. It becomes possible to strengthen.

  Although the first and second magnets 23c and 24a are permanent magnets, for example, the second magnet 24a may be an electromagnet. The variable display element may be an organic EL element in addition to the liquid crystal display element 21b, and may be a segment type in addition to the dot matrix type. In addition, the display plate may include a fixed display element in which a light-shielding portion is printed and formed on a translucent resin and a fixed display portion indicated by the pointer 22 is formed. Further, the illumination means for illuminating the pointer 22 is not limited to the LED 27. For example, an organic EL element is applied to the display plate 21, and light from the organic EL element is emitted toward the light receiving unit 22a1. May be. Further, although the stepping motor 25 is provided as the pointer driving means, it goes without saying that, for example, a cross coil type movement can be used instead of the stepping motor 25.

  Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned 1st embodiment, or an equivalent part, and the detailed description is abbreviate | omitted.

  The second embodiment is different from the first embodiment in that the first and second magnets 23c and 24a are each two-pole magnetized on the opposing surfaces. FIG. 4 shows the first magnet 23c. 4A is a view of the first magnet 23c as viewed from the side facing the second magnet 24a, and FIG. 4B is a view of the first magnet 23c as viewed from the side (curved surface side). It is a figure. The first magnet 23c is two-pole magnetized on the facing surface. In the second embodiment, the first magnet 23c only needs to have two poles magnetized on the opposing surface, and performs different two-pole magnetization on both planes as shown in FIG. There may be. Although not shown, the second magnet 24a is also two-pole magnetized on the surface facing the first magnet 23c in the same manner as the first magnet 23c.

  FIG. 6 is a diagram showing the relationship between the rotational torque due to the attractive force generated when a rotational deviation occurs between the first and second magnets 23c and 24a and the distance between the first and second magnets 23c and 24a. It is. In addition, T1 shows the characteristic when dipole magnetization is performed on the opposing surface, T2 shows the characteristic when quadrupolar magnetization is applied on the opposing surface, and T3 shows the case when 8-pole magnetization is applied on the opposing surface. T4 indicates the characteristics when 16 poles are magnetized on the opposing surface. As apparent from FIG. 6, the present inventor has found that the characteristic T1 due to dipole magnetization shows the highest attraction torque when the distance between the first and second magnets 23c, 24a is increased. In the indicating instrument device that rotates the pointer 22 in conjunction with the rotational drive of the pointer driving means by the magnetic force of the first and second magnets 22c and 23a, a liquid crystal display element is provided between the first and second magnets 23c and 24a. Since a certain distance is required between the first and second magnets 22c and 23a due to the arrangement of 21b, the first and second magnets 22c and 23a are magnetized in two poles on the opposing surfaces. In such an indicating instrument device, a high suction torque capable of rotating the pointer 22 can be obtained.

The front view which shows 1st embodiment of this invention. The principal part expanded sectional view which shows 1st embodiment same as the above. The figure which shows the 1st magnet applied to 1st embodiment same as the above. The figure which shows the 1st magnet applied to 2nd embodiment of this invention. The figure which shows another example of the 1st magnet applied to 2nd embodiment same as the above. The figure which shows the relationship between the rotational torque by the attraction force which generate | occur | produces when the rotation gap arises between the 1st, 2nd magnet in 2nd embodiment same as the above, and the distance between 1st, 2nd magnets.

Explanation of symbols

21 Display board 21a Translucent substrate (first display board)
21b Liquid crystal display element (variable display element, second display panel)
22 Pointer 22a Pointer body 22a1 Light receiving part 22b Pointer cap 23 Shaft part 23a Main shaft 23b Main bearing part 23c First magnet 23d First yoke 23e Magnet receiving part 24 Bearing part 24a Second magnet 24b Second yoke 25 Stepping motor 26 Circuit board 27 LED (lighting means)

Claims (9)

An indicator instrument device comprising: a display plate; a pointer provided on the front side of the display plate; and a pointer driving means provided on the rear side of the display plate for rotating the pointer,
The display panel has a translucent first display panel and a second display panel disposed behind the first display panel with a space therebetween,
A shaft portion having a main shaft penetrating the first display plate and the pointer being disposed and fixed; and a main bearing portion disposed on the first display plate and rotatably holding the main shaft;
A first magnet provided on the main shaft so as to be positioned between the first display plate and the second display plate;
A second magnet provided on the pointer driving means so as to face the first magnet,
An indicating instrument device, wherein the pointer is rotated by the attraction force of the first and second magnets in conjunction with the rotational driving of the pointer driving means. The indicator instrument device according to claim 1, wherein a yoke is disposed on a surface of the first magnet that is not opposed to the second magnet. The indicating instrument device according to claim 1, wherein the first and second magnets are formed by alternately magnetizing a plurality of S poles and N poles. 2. The indicating instrument device according to claim 1, wherein the first and second magnets are two-pole magnetized on opposing surfaces. The indicator device according to claim 1, wherein the pointer includes a light receiving unit that receives illumination light emitted from behind the pointer and shines the pointer. 6. The indicating instrument device according to claim 5, wherein the illuminating means for emitting the illumination light is disposed on the first display board. The indicating instrument device according to claim 1, further comprising a bearing portion joined to a shaft portion of the pointer driving means, wherein the second magnet is provided in the bearing portion. The indicating instrument device according to claim 7, wherein the second magnet is formed integrally with the bearing portion. 2. The indicating instrument device according to claim 1, wherein the second display board includes a variable display element including a variable display unit instructed by the pointer.

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