JPH0584820U - Display for instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a display device for an instrument in which the light source unit can be easily replaced and the cord is not violated. A front unit including a display panel, a backlight provided on the back surface, a light source unit housed in the backlight to illuminate the display panel, and a printed circuit board provided on the back surface of the backlight. When,
In a display device for an instrument, which has a housing for accommodating a light source drive circuit for generating electric power for lighting the light source unit and a main printed circuit board, and a connecting portion for connecting the housing and the front unit, the light source unit and the print. A power cord section for connecting the backlight side of the board and a cable for connecting the casing side of the printed board and the main printed board are provided, and a light source unit lighting signal and a control signal of the display panel are provided by a signal line of the cable. Characterized by sending.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a display device for an instrument used for an industrial control device or the like, and more particularly to an improvement for facilitating replacement of a light source while the instrument is in operation.

[0002]

[Prior Art]

 The applicant of the present invention has proposed a display device for an instrument that can be replaced online, for example, in Japanese Patent Application No. 3-259490. FIG. 3 is a configuration diagram of main parts disclosed in the prior application. In the figure, the front unit 10 is provided on the front of the instrument, and displays characters and figures on the display panel 20 and swings the casing 60 with respect to the main body through the connecting portion 70 of the parallel link mechanism. Up is possible. The upper lid 12 is provided on the ceiling surface of the front unit 10, and covers the display panel 20, the backlight 30, and the printed circuit board 50 inside the front unit 10 and then covers the same. As the display panel 20, liquid crystal, EL (electro luminescence) element, LED or the like is used. The light source unit 80 is attached to the backlight 30 so that the display on the display panel 20 can be easily seen even when the surroundings are dark. The main printed circuit board 61 is housed in the housing 60, and is equipped with circuits necessary for, for example, a controller, etc., and transmits contents such as set values and instruction values to the printed circuit board 50. The light source drive circuit 66 is a DC-AC converter housed in the housing 60, and lights the light source unit 80 via the main body side connector 64.

FIG. 4 is a detailed view of the light source unit 80. The backlight unit 30 has a grooved light source accommodating portion 34 for accommodating the light source tube 82, and makes the light emitted from the light source tube 82 uniform to illuminate the display panel 20. The light source tube 82 has electrodes at both ends like a cold cathode tube and the like, and light source code portions 84 are attached to both sides. The light source side connector 86 is attached to the other end of the light source cord portion 84, and is connected to the main body side connector 64. A cord clamp (not shown) binds the light source cord portion 84, and is provided in the housing 60. When the front unit 10 is swung up or down, the light source cord portion 84 violates and the signal line is pinched. Is being prevented.

In the device configured as described above, the replacement of the light source unit is performed by the following procedure. Swing up the front unit 10 with respect to the main body, and remove the upper lid 12. The light source side connector 86 is removed from the main body side connector 64. The light source cord portion 84 is removed from the cord clamp. The light source unit 80 is removed from the backlight 30. The length of the light source code portion 84 of the new light source unit 80 is adjusted to the designated value. The new light source unit 80 is inserted into the backlight 30. The light source cord portion 84 is attached to the cord clamp. The light source side connector 86 is connected to the main body side connector 64. The upper lid 12 is attached to the front unit 10 and swings down with respect to the main body.

[0005]

[Problems to be solved by the device]

 However, the conventional replacement work of the light source unit has a problem that it is complicated and time-consuming because the work is performed on the rear surface of the front unit 10. Further, since a cord clamp is required, the number of parts is increased and the assembling work of the light source cord portion 84 is complicated. Further, since it is a manual work to adjust the length of the light source cord section 84 to the designated value, when the front unit 10 is moved up / down, if the length is short, the cord is unnecessarily forceful, and if the length is long, There is also a problem that the cord is sandwiched between the front unit 10 and the main body, and the reliability is lowered.

The present invention solves such a problem, and an object of the present invention is to provide a display device for an instrument in which a light source unit can be easily replaced and a cord is prevented from being damaged.

[0007]

[Means for Solving the Problems]

 The present invention that achieves the above object includes a display panel, a backlight provided on the back surface thereof, a light source unit housed in the backlight to illuminate the display panel, and a light source unit provided on the back surface of the backlight. A housing that contains a front unit having a printed circuit board on which a circuit for controlling the display panel is mounted, a main printed circuit board on which an arithmetic circuit as an instrument is mounted, and a light source drive circuit that generates electric power for lighting the light source unit. Body and two postures: a closed state in which the casing and the front unit are connected and the casing opening is covered by the front unit, and an open state in which the front unit is swung up to expose the casing opening. A display device for an instrument having a connecting portion having the following configuration.

That is, a power cord section that connects the light source unit and the backlight side of the printed circuit board, and a cable that connects the housing side of the printed circuit board and the main printed circuit board are provided, and a signal line of the cable is provided. It is characterized by sending a light source unit lighting signal and a display panel control signal.

[0009]

[Action]

 Since the power cord is housed inside the front unit, the light source unit can be easily replaced without being sandwiched between the front unit and the housing even when swinging up. Since the cable is not supposed to be replaced, no mechanical inconvenience will occur even if there is a swing-up.

[0010]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing the construction of an embodiment of the present invention, and FIG. 2 is a perspective view showing a main part of a front unit. Incidentally, in FIG. 1, those having the same functions as those in FIG. In the figure, a light source connector 52 is provided on the upper lid 12 side of the printed circuit board 50, and a light source side connector 86 is connected. One end of the cable 54 is soldered to the upper side of the housing side of the printed circuit board 50, and the other end is connected to the main printed circuit board 61 by the connector 56. The cable 54 is a flat cable, and the number of signal lines is, for example, 34. A signal for controlling the display panel 20 and a power signal for driving the light source unit 80 are flowing through the cable 54. Since the power consumption of the power supply unit 80 is not so large, the capacity will not be insufficient even if the signal line of the flat cable is used.

The arm length of the connecting portion 70 is L, and the distance from the mounting axis of the housing 60 of the connecting portion 70 to the connector 56 of the main printed circuit board 61 is D. The cable 54 is longer than L + D, and is convex downward when the front unit 10 is swung up. When the front unit 10 is swung down, the front unit 10 and the main printed circuit board 61 are accommodated in a substantially stacked state.

In the device configured as described above, the work of replacing the light source unit is performed as follows. Swing up the front unit 10 with respect to the main body, and remove the upper lid 12. The light source side connector 86 is removed from the light source connector 52. The light source unit 80 is removed from the backlight 30. The new light source unit 80 is inserted into the backlight 30. The light source side connector 86 is connected to the light source connector 52. The upper lid 12 is attached to the front unit 10 and swings down with respect to the main body.

In the above embodiment, the case where the light source unit is replaced has been described, but according to the present invention, if the backlight has a detachable structure, the backlight and the light source unit are integrated. It is exchangeable.

[0014]

[Effect of the device]

 As described above, according to the present invention, since the power cord of the light source unit is connected to the printed circuit board housed in the front unit, the replacement work of the power unit can be done quickly only on the top face of the front unit. .. Since the cable 54 connects the printed circuit board and the main printed circuit board in consideration of swing up / down, not the object of replacement, the cord clamp that was required in the past is unnecessary, and the assemblability is improved and the number of parts is increased. Need less Since the power cord is housed in the front unit, there is a practical effect that unnecessary stress is not accompanied by swing up / down.

[Brief description of drawings]

FIG. 1 is a configuration perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the front unit.

FIG. 3 is a configuration diagram of main parts disclosed in the prior application.

FIG. 4 is a detailed view of a light source unit.

[Explanation of symbols]

 10 Front Unit 20 Display Panel 30 Backlight 50 Printed Circuit Board 60 Housing 70 Connection Part 80 Light Source Unit

Claims (1)

[Scope of utility model registration request] 1. A display panel, a backlight provided on the back surface of the display panel, a light source unit housed in the backlight to illuminate the display panel, and a display panel provided on the back surface of the backlight. A housing for accommodating a front unit having a printed circuit board on which a circuit is mounted, a main printed circuit board on which an arithmetic circuit as an instrument is mounted, and a light source drive circuit for generating electric power for lighting the light source unit, A connecting portion that connects the housing and the front unit and has two positions: a closed state in which the front unit covers the housing opening and an open state in which the front unit is swung up to expose the housing opening. And a power cord section connecting the light source unit and the backlight side of the printed circuit board, the printed circuit board And a cable for connecting the main printed circuit board and the housing side is provided, instrument display device characterized by sending a control signal of the light source unit lighting signal and the display panel by a signal line of the cable.