Television – Video display – Cabinet or chassis
Reexamination Certificate
1997-11-24
2001-08-07
Lee, Cheukfan (Department: 2622)
Television
Video display
Cabinet or chassis
Reexamination Certificate
active
06271894
ABSTRACT:
The invention is based on an arrangement for setting an image display device with a housing.
Known solutions comprise sheet-metal parts to which there are assigned in each case setting parts eccentric or threaded bolts) and guiding parts (clinched bolts, pins and/or levers). One sheet-metal part with the corresponding setting or guiding parts is necessary for each setting direction (axis). Therefore, for a setting mechanism of the known type, four such sheet-metal parts are necessary and are assigned to one another in a layered manner. This produces a very complex mechanical construction, which relies on very accurate individual parts and extremely careful assembly. Also disadvantageous is the tolerance limit due to the many individual components. The great space requirement makes a compact design difficult and increases the costs of the lens, because a relatively great back focus is required. The amount of tooling is great and assembly is complicated.
The invention is based on the object of simplifying a setting mechanism of an image display device.
According to the invention, parts of the setting mechanism are integrated into the housing and/or setting means are arranged in such a way that they assume not only the setting function of one axis but also the guiding function of a further axis. Setting with the setting means is made possible in a number of axes, preferably in four axes. The setting means are formed by eccentric bolts. Guiding pins serve for guidance in one axis. Clamping screws serve for fixing the adjusted axes. Slots serve as guiding aids in the various axes.
With the first eccentric bolt it is possible to displace a first axis in the horizontal, rearward and forward direction. With the second eccentric bolt, a displacement of the second axis is possible in the horizontal, right and left direction. With the third eccentric bolt it is possible to set the further two axes vertically and radially.
In a projection television set, a plurality of image display devices are used. These image display devices are formed, in particular, from an LCD (Liquid Crystal Display), also known as an LCD light valve. To permit congruent projection of the channels red, green, blue it is necessary to perform an adjustment and fixing of the LCDs. Advantageous in the case of the solution according to the invention is the simple construction with an absolute minimum of individual parts, simple assembly and clearly arranged setting device. Minimal cumulative tolerances, no individual precision parts (no close bearing tolerances) are required. A compact design, since the setting mechanism is outside the optical channel.
In LCD projectors, the light generated by the illuminating device is split into three light channels (red, green, blue) with the aid of dichroic mirrors. In each channel there is a monochromatic LCD light valve. Between the LCDs and the projection lens, these three channels are brought together again by dichroic mirrors and are projected via a projection lens onto a projection surface (projection screen or ground-glass screen). The three partial images then produce a colour image by additive colour mixing. A prerequisite for this is a congruent positional setting of the LCDs. This LCD setting is performed in 4 axes:
distance of the LCDs from the projection lens (picture definition setting)
setting lines horizontally
setting vertical position
setting lateral position.
With such a device, the required setting accuracy is about {fraction (
1
/
4
)} of the pixel size. (In the case of a 2″ LCD 16:9 820×560 pixels, the pixel size is 56 m×46 m.) This setting is fixed by clamping screws and is retained throughout the entire service life of the LCD.
This arrangement and multifunctional assignment of the eccentrics makes it possible to dispense with further complicated sheet-metal parts.
REFERENCES:
patent: 3816646 (1974-06-01), Cinque
patent: 4386372 (1983-05-01), Slater
patent: 4825295 (1989-04-01), Ishikawa et al.
patent: 5177644 (1993-01-01), Stark
patent: 5194993 (1993-03-01), Bedzyk
patent: 5196963 (1993-03-01), Sato et al.
patent: 5220460 (1993-06-01), Bedzyk
patent: 5237399 (1993-08-01), Inada et al.
patent: 5465126 (1995-11-01), Fukuda
patent: 4204511A1 (1993-08-01), None
patent: 0409246A2 (1991-09-01), None
patent: 2108700A (1983-05-01), None
Search Report Jan. 18, 1995.
Deutsche Thomson-Brandt GmbH
Lee Cheukfan
Tripoli J. S.
Wein F. A.
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