Illumination – Housing – With mounting means
Reexamination Certificate
2000-12-14
2002-02-12
Sember, Thomas M. (Department: 2875)
Illumination
Housing
With mounting means
C362S370000, C362S390000, C362S396000, C362S549000, C362S547000, C362S430000
Reexamination Certificate
active
06345904
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the priority benefit of Taiwan application serial no. 89121896, filed Oct. 19, 2000.
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to a projection device. More particularly, the present invention relates to a fastening device for a projector lamp that requires a single spring only.
2. Description of Related Art
Projector is a common office and household device. Using a projector, a small picture can be put on a relatively large screen for several people to look at all at once. For example, a lecturer can project some of the information related to the speech to a big screen for every participants of the lecture to read. With the rapid progress in electronic technologies, projector not only can project simple image but electronic images can also be projected onto a wall.
However, no matter what type of projector is used, images are generated by a projector lamp. Hence, images and projector lamp have a close and sensitive relationship with each other. If the direction of lamp projection is not on the pre-determined optical axis, brightness and color texture of the image on the projection will be affected. Therefore, fastening the lamp onto a lamp casing such that there is minimal deviation from the optical axis is an important factor for producing a quality image.
Conventionally, to prevent deviation of lamp projection direction, a plurality of springs is required in relation with the lamp casing. These springs are usually difficult to assemble.
FIG. 1
is a perspective view looking from the bottom of a conventional structure for fastening the projector lamp to a lamp casing before a spring is positioned in the final position.
FIG. 2
is a perspective view looking from the bottom of a conventional structure for fastening the projector lamp to a lamp casing after a spring is positioned in the final position.
FIG. 3
is a perspective view looking from the top of a conventional structure for fastening the projector lamp to a lamp casing after a spring is positioned in the final position.
A lamp casing
100
is shown in
FIGS. 1
to
3
. The lamp casing
100
has a central space enclosed by four sidewalls so that a lamp
101
can mount inside the casing
100
. In
FIG. 1
, only the left sidewall and the lower sidewall of the lamp casing can be seen. After the lamp
101
is positioned inside the lamp casing
100
, a strip-shaped spring
102
and a sheet-shaped spring
110
(see
FIG. 2
) are used for fastening the lamp
101
in a designed positioned. Ultimately, the projection direction of the lamp
101
and the designed optical axis will coincide. As shown in
FIG. 1
, the left sidewall has a first opening
104
, a second opening
106
and a third opening
108
. The spring
102
must first penetrate the second opening
106
so that one end is fixed upon another opening
107
(see FIG.
3
). The other end of the spring
102
is fixed upon the opening
104
. After fixing the spring
102
on the destined openings
104
,
106
and
107
, stress created by deformation will fasten the lamp
101
onto the fours sidewalls of the lamp casing
100
. The structure formed by the combination of the lamp
101
and the lamp casing
100
has a rectangular design. The lamp wall is constructed using non-explosive glass.
Besides the strip-shaped spring
102
, the sheet-shaped spring
110
is also required. In
FIG. 2
, the sheet-shaped spring
110
is mounted through the opening
108
. The lamp
101
is installed by pushing from one corner of the lamp to the other corner of the lamp wall. Hence, the lamp
101
has at least three corners fixed by the sheet spring
110
and the strip spring
102
.
The aforementioned conventional method of fixing the lamp must rely on two or more springs. In particular, the strip spring
102
must pass through the openings
106
and
107
. Hence, the step of assembling the lamp and the lamp casing together is difficult.
SUMMARY OF THE INVENTION
Accordingly, one object of the present invention is to provide a fastening device for projector lamp. The fastening device includes a lamp, a lamp casing and a strip-shaped spring that fastens the lamp onto the lamp casing. The lamp casing has a first sidewall, a second sidewall, a bottom wall and an upper connective structure, together they encloses a central space. The first sidewall has a first opening and the second sidewall has a hook groove. There is a second opening between the second sidewall and the bottom wall. The spring has a first end and a second end. A central portion of the strip-shaped spring can be latched by the hook groove. The first end of the spring is fixed by the first opening on the first sidewall. The second end of the spring has an internal recess structure. The second end of the spring passes through the second opening and fastens onto a recess groove on the lamp. The deform stress produced by passing the spring through the first opening, the hook groove and the recess groove is capable fixing the lamp relative to the lamp casing.
According to the invention, the hook groove is open-ended and hence the stripshaped spring can easily slip into position. Consequently, the assembly process is greatly simplified. In addition, the internal recess structure at the second end of the strip-shaped spring can combine with the recess groove on the lamp to fix the lamp, thereby eliminating the need for a conventional sheet-shaped spring. Since only a single spring is required in this invention, the fastening structure and the assembly process can both be simplified.
It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 1859674 (1932-05-01), Michel
patent: 5711597 (1998-01-01), Unno
patent: 6109773 (2000-08-01), Nace
Hsu Tsung Jung
Lu Chang-Hsing
Alvi Ali
Delta Electronics , Inc.
J. C. Patents
Sember Thomas M.
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