JPH0430595B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method of manufacturing a display device.

Structure of a conventional example and its problems A conventional display device will be explained with reference to FIGS. 1 to 7.

Fig. 1 is a front view of a slot-in video tape recorder (hereinafter referred to as VTR) equipped with a conventional display device, Fig. 2 is an operation explanatory diagram showing the slot-in operation of the VTR, and Fig. 3 is the main part of the display device. The enlarged view and FIG. 4 are sectional views taken along line A-A' of the same device, and FIGS. 5 to 7 are sectional views of essential parts showing other conventional devices. 1 in the figure is a slot-in type VTR body,
2 is a rotary cassette insertion door (hereinafter referred to as lid) made of translucent resin; 3 is a display board on which a serial number such as "N0001112" is printed or engraved, as shown in FIG. 3; Reference numeral 4 denotes a transparent panel for the operation section of the VTR main body 1, and 5 is a display board attached to the panel 4 from the front side, and is a display board for displaying the product part number and the like. 6 is a tape cassette for storing a reel wound with magnetic tape; 7 is a recess provided on the surface of the lid 2 for fixing the display panel 3;

Next, the operation of this device will be explained.

First, as shown in FIG. 2, when the tape cassette 6 is moved in the direction of arrow B, the lid 2 rotatably supported on the VTR body 1 is rotated in the direction of arrow C. By doing so, the tape cassette 6 can be installed at a predetermined position within the VTR main body 1. However, such a display device has a drawback in that the serial number and the like are easily rubbed off and erased because the display plate 3 is exposed on the surface. This drawback also occurs when the display board 11 is directly attached to the surface 8a of the lid 8 without providing any recesses, as shown in FIG.

To solve this problem, either the display board 12 is attached directly to the back surface 9a of the lid 9 without a recess as shown in FIG. 6, or the recess 14 is formed on the back surface 10a of the lid 10 as shown in FIG. The display board 13 may be attached therein.

However, in the display devices shown in FIGS. 6 and 7, in order to fix the display plates 12 and 13 to the lids 9 and 10, adhesive or the like is applied to the surfaces of the display plates 12 and 13, or the back surfaces of the display plates and the lids are fixed. 9 and 10 must be coated with adhesive or the like.

In this case, the adhesive or the like intervenes in the gap between the display boards 12, 13 and the lids 9, 10, and the display boards 12, 13
The problem was that the displayed characters were difficult to see due to uneven adhesion on the surface.

Purpose of the Invention The present invention is intended to eliminate such drawbacks, and to enable display of characters, etc., to be clearly displayed without being easily erased, and to provide a method for displaying such a display. The purpose is to make the device easier to manufacture.

Structure of the Invention The present invention involves inserting a display board into a recess of a translucent member made of thermoplastic resin, inserting and pressing a drop-off prevention plate bent smaller than the opening of the recess into the recess, and pushing the drop-off prevention plate through the opening. In addition to large plastic deformation, by applying ultrasonic vibration to the fall prevention plate, the inner wall of the recess is melted, and by biting the fall prevention plate into the translucent member and fixing it, the displayed characters etc. will not be easily rubbed off. Furthermore, the present invention provides a manufacturing method that can easily manufacture a display device with high definition.

DESCRIPTION OF EMBODIMENTS The slot-in type which is one embodiment of the present invention will be described below.
A method of manufacturing a display device used in a VTR will be explained with reference to FIGS. 8 to 12.

8 to 11 are manufacturing process diagrams of a display device according to an embodiment of the present invention, and FIG. 12 is a perspective view of a drop-off prevention plate of the same device.

In the figure, reference numeral 20 denotes a tape cassette insertion door used in a slot-in type VTR of the same type as the VTR shown in FIG. 1, and is made of thermoplastic translucent resin. 20a is the surface of the lid 20;
Reference numeral 21 is a recessed portion provided on the back surface 20b of the lid 20 and having a rectangular opening, and 22 is a display plate on which the serial number of the VTR and the like are displayed by printing, engraving, or hot stamping.

Reference numeral 23 denotes a drop-off prevention plate (hereinafter referred to as A plate) made of a thin aluminum plate with a dogleg-shaped cross section, and plate A is a thin aluminum plate with a thickness of 0.5 mm.

However, this drop-off prevention plate is not limited to a thin aluminum plate, and may be any material that is plastic and has good ultrasonic conductivity. 24 is a pressing iron vibrated by an ultrasonic vibrator (not shown), 25 is an engaging portion formed in the recess 21 of the lid 20, is the opening dimension of the recess 21, and ' is the dimension of the A plate 23 after stretching. It is.

Here, the dimensions of the A plate 23 before pressing are the recess 21
The size after plastic deformation due to pressing becomes larger than the opening size.

Next, a method of manufacturing this display device will be explained. First, as shown in FIG.
The display board 22 is inserted into the recess 21 so that the displayed characters are visible from the surface 20a of the lid 20 with b facing upward.

Next, as shown in FIG. 9, an A plate 23 having a dogleg-shaped cross section is placed on the display board 22.

Next, as shown in FIG. 10, the pressing iron 24 is moved in the direction of arrow D to press the A plate 23 and apply ultrasonic vibration.

As a result, the A plate 23 is pushed out, but
At this time, since the ultrasonic vibration from the pressing iron 24 is transmitted to the A plate 23, the recess 21 which the A plate 23 comes into contact with
The inner wall of the recess 21 partially melts due to frictional heat.
An engaging portion 25 can be formed therein.

Further, at this time, the A plate 23 is plastically deformed by the pressure of the pressing iron 24. Therefore, even after the pressing iron 24 is separated from the A plate 23, the A plate 23 engages with the engaging portion 25 in the recess 21 and does not fall off. By doing so, the A-board 23 is fixed to the display board 22 to the lid 20 in a pressed state and firmly bitten into the recess 21.

Therefore, the display board 22 can be fixed to the lid 20 without using any adhesive or the like.

Moreover, the display plate 22 is connected to the A plate 23 and the lid 20.
Since the display board 22 is held between the display board 22 and the display board 22, the display board 22 will not fall off.

Although this embodiment shows an example in which a thin plate having a dogleg-shaped cross section is used as the A plate 23, the present invention is not limited to this, and as shown in FIGS. 13 and 14, a thin plate 23a having an arc-shaped cross section The thin plate 23b may have a corrugated cross section, or may be made of other shapes, and may be made of other materials other than the A plate as long as it has good ultrasonic conductivity and can be plastically deformed. It's okay to be hot.

Furthermore, in this embodiment, when no tape cassette is inserted (not in use), the lid 20 is held perpendicularly to the VTR main body as shown by the solid line in FIG. in the opposite direction to C)
It is configured so that it cannot be rotated. Therefore, the lid 20 is rotatably held only between the position shown by the solid line and the position shown by the dotted line in FIG.

Therefore, in order to replace the display board 22, the falling-off prevention plate 2 fixed to the rear surface 20b of the lid 20 must be replaced.
3 and the display board 22 must be removed and the VTR body must be disassembled. Note that according to this embodiment,
Since only the part that contacts the inner wall of the recess is heated by ultrasonic vibration without directly heating the drop-off prevention plate, it prevents deterioration of the drop-off prevention plate, melting of the inner wall other than the contact area, and deformation of the lid etc. due to heat. It can be reduced to a large extent.

Effects of the Invention As described above, according to the manufacturing method of the present invention, it is possible to easily manufacture a display device with high definition and no scratching of displayed characters.

[Brief explanation of drawings]

Fig. 1 is a front view of a VTR equipped with a conventional display device, Fig. 2 is an explanatory diagram of the operation of the VTR, Fig. 3 is an enlarged view of main parts of the display device, and Fig. 4 is an A-
5, 6 and 7 are sectional views of other conventional display devices, and FIGS. 8 to 11 are fabrication of a display device that is an embodiment of the present invention. 12 is a perspective view of a drop-off prevention plate of the same device, and FIGS. 13 and 14 are perspective views of a drop-off prevention plate of a display device according to another embodiment of the present invention. 1... VTR body, 2... Cassette insertion door (lid), 3... Serial number display board (display board), 4
...Operation unit transparent panel, 5...Display board, 6...
VTR tape cassette, 7... recess, 8, 9,
10...Lid, 8a...Surface of lid 8, 9
a, 10a...back side of lids 9, 10, 11, 1
2, 13...display plate, 14...recess, 20...lid, 20a...front surface, 20b...back surface, 21...
... recess, 22 ... display board, 23, 23a, 23b
...A plate, 24...pressing iron, 25...locking part.

Claims (1)

[Claims] 1. Insert a display board into a recess of a translucent member made of heat-softening resin, insert and press into the recess a drop-off prevention plate bent smaller than the opening of the recess, and make the drop-off prevention plate larger than the opening. Manufacturing a display device characterized by plastically deforming, melting the inner wall of the recess by applying ultrasonic vibration to the falling-off prevention plate, and fixing the falling-off prevention plate by biting into the light-transmitting member. Method.