Illumination – Light source and modifier – Adjustable or repositionable modifier
Reexamination Certificate
2000-12-15
2002-02-26
O'Shea, Sandra (Department: 2875)
Illumination
Light source and modifier
Adjustable or repositionable modifier
C362S293000, C362S319000, C353S062000
Reexamination Certificate
active
06350042
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a projecting lamp for projecting images to create visual and decorative effect, and more particularly to a projecting lamp having a focus control bar adapted to finely adjust focus of the projecting lamp to project clear image.
BACKGROUND OF THE INVENTION
There are various types of projecting lamps available in the markets, some of which have simple structure while others have complicate structure. These projecting lamps may be used in very wide applications, such as making reports, creating visual and decorative effects, etc.
FIGS. 10A and 10B
show a conventional projecting lamp currently available in the market. The projecting lamp includes a hollow cylinder
81
fixedly mounted to a top of a stand
80
. An illuminating means capable of emitting intensive light is mounted in a closed rear end of the cylinder
81
, and a picture holder
83
holding a projecting picture
82
, a locating ring member
84
, and a front ring member
86
holding a projecting lens
85
are sequentially mounted in an open front of the cylinder
81
from inner side to outer side. And, two straight rods
8
are rearward extended through the front and the locating ring members
86
,
84
to connect their rear ends to the picture holder
83
. To use the projecting lamp, the illuminating means is turned on for the same to emit light. The emitted light passes through the projecting picture
82
and the projecting lens
85
, so that an image on the projecting picture
82
is projected and magnified on a plane, such as a wall surface.
Since a distance between the projecting lamp and the wall surface varies, it is necessary to adjust a distance between the projecting picture
82
and the projecting lens
85
to project a clear image on the wall surface. In
FIG. 10A
, the distance between the projecting picture
82
and the lens
85
is large. By pulling the straight rods
8
outward, the distance is shortened, as shown in FIG.
10
B. To effect focus control in the conventional projecting lamp, an operator must hold the two straight rods
8
at the same to pull or push them in order to obtain a desired focus. Since there is only a very small adjustable distance between the projecting picture
82
and the lens
85
, it is difficult for the operator to apply a suitable magnitude of force on the two straight rods
8
in one direction to obtain the desired focus. It is very possible one movement of the rods
8
would bring the projecting picture
82
to be too close to or too far away from the lens
85
. Moreover, only one minor touch or vibration of the projecting lamp would possibly result in undesirable change in the adjusted focus, causing inconvenience in using the projecting lamp.
Further, the above-described focusing structure of the conventional projecting lamp assembled from the projecting picture
82
, the lens
85
and the straight rods
8
is fixed in the cylinder
81
through a frictional contact of an inner wall surface of the cylinder
81
with a plurality of leaf springs
841
extended from the lens holder
83
and the locating ring member
84
. The leaf springs
841
tend to scrap against and therefore damage the inner wall of the cylinder
81
. Moreover, the leaf springs
841
are subject to elastic fatigue after they have been used for a prolonged time and therefore lose their intended function of holding the focusing structure in the cylinder
81
.
In the conventional projecting lamp, the cylinder
81
is mounted on a top of a vertical stand
80
. It is difficult to adjust the cylinder
81
to different elevation angles and it is impossible to rotate the cylinder
81
in a plane relative to the stand
80
to a desired direction.
Therefore, it is desirable to develop an improved projecting lamp to eliminate the drawbacks existing in the conventional projecting lamps.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a projecting lamp that includes a projecting structure and a focus control bar that work together to enable easy and fine adjustment of a distance between a projecting picture and a projecting lens of the projecting lamp, and the adjusted focus of the projecting lamp is not subjected to easy change due to vibration or collision.
Another object of the present invention is to provide a projecting lamp having a lamp cylinder that is adjustable in its elevation-angle and angular position.
A further object of the present invention is to provide a projecting lamp that can be quickly disassembled for easy storage or conveyance.
REFERENCES:
patent: 57602 (1866-08-01), Warden
patent: 2341223 (1944-02-01), Lillie
patent: 4779176 (1988-10-01), Bornhorst
O'Shea Sandra
Rabin & Berdo P.C.
Sawhney Hargobind S.
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