Coating apparatus – Work holders – or handling devices
Reexamination Certificate
2000-05-22
2002-07-02
Lamb, Brenda A. (Department: 1734)
Coating apparatus
Work holders, or handling devices
C118S317000
Reexamination Certificate
active
06413316
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to display screens and display screen construction, and more particularly to devices and methods for lacquering the inner side of a display screen.
BACKGROUND AND SUMMARY OF THE INVENTION
Such a device and method have been used by the applicant for many years and are therefore known. In the known device and in the known method, the sealing means are provided with a frame-shaped flat rubber piece connected to the closing means by way of a connection frame, which flat rubber piece constitutes a sealing lip extending towards the frame-shaped peripheral area of a display screen inserted into the known device, the sealing lip substantially comprising four sealing lip sections and engaging the outer peripheral boundary face of the peripheral area of this display screen. In the known device and method, it is necessary to ensure a preferably exact positioning of the rubber ring and its sealing lip, for which appropriate adjusting measures are required. A further aspect is to be taken into account during permanent operation of the known device because the sealing lip may be contaminated when this is not prevented by suitable cleaning measures. To resist the solvent in practically every lacquer, such as toluene, the use of a solvent-resistant viton rubber for the rubber ring and its sealing lip is essential.
It would be advantageous to provide an improved device and an improved method, in which improved sealing means are used, which prevent the above-mentioned difficulties in a simple and low-cost manner.
Accordingly, in one aspect of the invention, a device for use in lacquering the inner side of a display screen has a front area that extends substantially transverse to the display screen axis, and a frame-shaped peripheral area, which is remote from the front area and extends substantially parallel to the display screen axis. The peripheral area is bonded by an outer peripheral boundary face. The device has a lacquering head which encloses an inner space and is closed at the top with a closing means having a passage that is bounded by a passage boundary face and can be covered by the display screen while leaving free a spacing between the passage boundary face of the passage in the closing means and the peripheral area of the display screen covering the passage in the closing means, and through which passage the inner side of the display screen can be lacquered. The lacquering head is provided with supporting means, with which the display screen covering the passage in the closing means can be axially supported, and in whose inner space lacquer-supply means for supplying lacquer can be inserted. The lacquering head is provided with sealing means for sealing the spacing. The sealing means has a frame bounded by an inner frame boundary face provided to surround the outer peripheral boundary face of the peripheral area of the display screen covering the passage in the closing means. The inner frame boundary face of the frame is adapted to form an air gap between itself and the outer peripheral boundary face of the peripheral area of the display screen covering the passage in the closing means. The air gap constitutes a flow resistance as a result of its dimensions and counteracting the escape of a gaseous medium from the inner space of the lacquering head and through the spacing between the passage boundary face of the passage in the closing means and the peripheral area of the display screen covering the passage in the closing means.
With the invention, an essentially simpler device is obtained in which sealing means realized in a very simple manner and yet being very effective are provided, in which with relatively little maintenance, the desired object is achieved, which is of great advantage for a high capacity utilization of a device according to the invention. The sealing means are advantageously realized without mechanical contact with the display screen present proximate to the lacquering head, which is very advantageous with a view to realizing a longer lifetime and avoiding an unwanted contamination. The air gap formed by means of the frame advantageously represents a uniformly effective flow resistance which counteracts an escape of a gaseous medium, such as toluene, from the inner space of the lacquering head in each air gap area with the same resistance, which is very advantageous for a spacial and temporally homogeneous drying of the lacquer on the inner side of the display screen.
One embodiment of the invention, described herein, yields the advantage that the display screen to be lacquered, inserted into the frame and axially supported, can be very accurately positioned transversely to the display screen axis, so that an equal width of the air gap along the entire outer peripheral boundary face of the peripheral area of the display screen is ensured.
Some embodiments of the invention may be equipped, for example, with a frame having an inner frame boundary face whose longitudinal extension extending parallel to the display screen axis is smaller than the extension, extending substantially parallel to the display screen axis, of the outer peripheral boundary face of the peripheral area of the display screen. Likewise, a device according to the invention may be equipped, for example, with a frame having an inner frame boundary face, whose longitudinal extension extending parallel to the display screen axis is larger then the extension, extending substantially parallel to the display screen axis, of the outer peripheral boundary face of the peripheral area of the display screen. In both cases, a desired flow resistance of the air gap can be achieved by a corresponding choice of its dimensions.
An embodiment of the invention described herein advantageously provides an air gap between the inner frame boundary face of the frame and the outer peripheral boundary face of the peripheral area of each display screen to be lacquered. It has further proved to be very advantageous when an end zone of the frame bounding the inner frame boundary face of the frame at its end remote from the closing means and an end zone of the display screen bounding the outer peripheral boundary face of the peripheral area of the display screen covering the passage in the closing means at its end remote from the closing means are substantially situated in a plane extending transversely to the display screen axis of the display screen. Apart from positioning, alignment and dimensioning of the inner frame boundary face of the frame, it may also be noted that the inner frame boundary face of the frame may have a completely smooth surface, but also a surface structure which is completely or partly roughened or is uneven so as to obtain a desired flow resistance.
In an embodiment of the invention described herein, to ensure mechanical stability the frame has a dimension extending transverse to its inner frame boundary face that substantially corresponds to the longitudinal extension, extending parallel to the display screen axis, of the inner frame boundary face of the frame. Furthermore, the provision of this feature has a positive influence on the flow resistance of the air gap, because turbulent air streams, which may possibly occur during rotation of the lacquering head in an area of an outer edge of the frame and may lead to air pressure differences along each outer edge of the frame, are inhibited by the side of the air gap facing the front area of the display screen.
In an embodiment of the invention described herein, the frame has a substantially rectangular cross-section. This has proved to be very advantageous because it ensures a very simple possibility of manufacturing the frame.
In an embodiment of the invention described herein, to provide easy insertion and propositioning of each display screen, the side of the frame remote from the closing means has an inlet chamfer blending with the inner frame boundary face.
In an embodiment of the invention described herein, the side of the frame facing the closing means has an outlet chamfer blending with the i
Koninklijke Philips Electronics , N.V.
Lamb Brenda A.
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