Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1997-11-18
2001-09-11
Fuller, Benjamin R. (Department: 2855)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C248S923000
Reexamination Certificate
active
06288891
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a display apparatus having display means comprising, for example, a liquid crystal panel or the like.
2. Related Background Art
Hitherto, a display apparatus having a display unit comprising, for example, a liquid crystal panel or the like is constructed as shown in, for instance, FIG.
37
. In the diagram, a display apparatus
500
is mainly made up of a display unit
501
comprising a liquid crystal panel or the like, a keyboard
502
to input information, and a main body
503
of the display apparatus.
In such a display apparatus, when inputting by the keyboard
502
, the display unit
501
is provided for the operator to only look at the display contents. The display unit
501
is constructed so that it can be moved in directions A in the diagram.
As shown in
FIG. 38
, when inputting by an input pen
504
, the display apparatus
500
fixes the display unit
501
to a position where the operator can easily input by using the input pen
504
.
As shown in
FIGS. 39
,
40
, and
41
, the display apparatus
500
is constructed in a manner such that the position of the display unit
501
is changed by using connecting portions
506
and
507
as fulcrums, thereby changing from a form shown in
FIG. 37
to a form shown in FIG.
38
.
As such a kind of apparatus, the apparatus supported by a stand having a mechanism such that a tilting angle of a display screen can be varied in accordance with a body size or a posture of the user or an environment (light reflection of the external light or the like) of a use location is used. There is also an apparatus constructed so that a swiveling operation can be performed.
Particularly, in recent years, the realization of a large screen of a liquid crystal display device is progressing and a thin size of the apparatus has been realized. Therefore, in an apparatus such that the tilting operation is performed by setting a state in which the screen is almost vertical to the desk surface to a reference state in a manner similar to the CRT, in order to miniaturize an installation area, the depth dimension of a stand for supporting the screen is reduced. On the other hand, in an apparatus such that an inputting operation is performed by directly operating on the screen like a touch panel or a pen input apparatus, an apparatus in which an angle of screen lies within a range from a state where it is parallel with the desk surface to about 30° such that the operator can easily operate even in case of the desk-top type has been realized and is started to be put into practical use. In case of the CRT, although it is necessary to bury the CRT into the desk, such an angle could be realized owing to the thin size of the apparatus. As mentioned above, in case of the apparatus in which an angle of screen is set to a small angle, since a viewpoint of the user can be set to be downward, it is also desirable from a point of prevention of a visual disease such as a dry eyes or the like.
An apparatus using a rotary arm in such a display apparatus has been described in U.S. Pat. No. 4,438,458 issued Mar. 20, 1984 to Münscher. By using the rotary arm, an angle of screen can be varied from the horizontal state to an almost vertical state and a height can be also changed.
In a display apparatus having a display device made of liquid crystal or the like as mentioned above, particularly, in a display apparatus having a display device with a temperature dependency with respect to a display speed of liquid crystal or a luminance of a back light, it is necessary to suppress an increase in temperature in a casing enclosing the display apparatus as much as possible. For this purpose, a method of forcedly cooling by attaching a fan or a method of radiating by a natural convection is used.
However, the above conventional display apparatus has a problem such that it can be fixed to only two points of a position (
FIG. 37
) where it is used only for seeing the display contents and a position (
FIG. 38
) at the time of inputting by using the pen or the like, so that the display apparatus cannot be fixed to an arbitrary position between those two points.
However, the conventional apparatus has some inconveniences. That is, when the display screen is large in size, since a weight also increases, a large force is necessary to adjust the screen angle and there is a drawback such that it is difficult to use the apparatus. Even in a state in which the screen is made to stand vertically, an installation space on the desk corresponding to almost a length in vertical direction of the display unit is necessary. In order to vertically put the apparatus in a folded state, it is necessary to once lift up the main body and it is inconvenient in case of the apparatus with a large size. When the angle of screen is changed, since the center of gravity moves forward and backward, a stability is also insufficient. Moreover, if the weight is especially large and a moving force is large, there is a fear such that a finger or the like of the user is sandwiched between the rotary arm and a base seat portion or a display unit and the user is seriously externally wound. There is, consequently, a problem on safety. Further, in case of an apparatus for directly inputting onto the screen by using a pen or a finger, since a pressing force is applied onto the screen surface, it is necessary to fix the screen in a state in which the tilting angle is variably set so as not to move the screen during the operation. However, there is not any apparatus having such a function.
In case of inclining and using the casing, since a flow of air in the casing changes depending on the angle of inclination, there is a fear such that an internal temperature changes and a desired temperature control cannot be performed. In such a case, a method of providing a fan with a temperature sensor is also considered. However, such a fan results in an increase in costs. Since a parameter for an on/off control of the fan is only a temperature, the fan continuously rotates in accordance with the temperature. In dependence on a use form, there is also a case where even if a display speed, a luminance, or the like of liquid crystal is sacrificed, it is difficult to stop the fan and to realize an electric power saving or silence. Further, a case where an obstacle is produced in front of an air exhaust port depending on an angle of the casing is also considered. That is, the temperature control cannot be properly performed depending on the position of the casing enclosing the display apparatus, so that there is a problem such that the temperature change cannot be suppressed.
SUMMARY OF THE INVENTION
The invention is made to solve the above problems and it is a first object of the invention to provide a display apparatus which can fix display means to an arbitrary position (angle).
It is a second object of the invention to realize a cheap, small, and light-weighted desk-top type display apparatus in which a tilting angle can be varied and fixed by a small force from a screen angle from a state that is parallel with the desk surface to about 30° at which the screen can be easily seen and which is suitable to an inputting operation to the screen to a screen angle which is almost vertical to the desk surface where an installing area is small and which is suitable when enclosing or to the use only for a display.
It is a third object of the invention to enable a tilting operation to be more smoothly performed and to realize a smooth swiveling operation.
It is a fourth object of the invention is to provide a display apparatus which can suppress a temperature change in a casing irrespective of a position of the casing, namely, an angle of inclination.
It is a fifth object of the invention to further realize a miniaturization of the apparatus.
To accomplish the above objects of the invention, there is provided a display apparatus comprising a moving unit having therein display means for displaying information and a base portion having supporting means for rotatably suppor
Ando Masahiro
Hasegawa Masahide
Ibaraki Shouichi
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Fuller Benjamin R.
Patel Jagdish
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