JPH028273Y2 - - Google Patents

Description

[Detailed description of the invention] This invention installs a reflective Fresnel lens on the stage of the projector body, pivots the head to the upper end of the pillar that is pivotally connected to the projector body, and folds the pillar and head. This invention relates to a Fresnel lens support device for a reflective overhead projector that makes it possible to use a reflective overhead projector.

Conventional reflective overhead projectors of this type are characterized by being small and lightweight, and when not in use, the head (containing a light source, projection lens, and reflector) and support can be folded up inside the projector body. In some cases, the Fresnel lens can be stored in a container, or the head and support can be folded and brought into contact with the stage. However, with these structures, other parts or the head and support can come into contact with the Fresnel lens when folded, causing damage. I had a problem with it. In order to solve this problem, some ideas have been devised, such as attaching a protective cover to the Fresnel lens in a removable manner, or making the Fresnel lens removable and fixing it inside out when not in use. In the former case, it is troublesome to attach and detach the protective cover, and the manufacturing cost increases by the amount of the protective cover, and in the latter case, there are problems in that detaching and fixing the Fresnel lens is extremely troublesome.

In view of the above-mentioned problems, the present invention aims to provide a Fresnel lens support device that allows the Fresnel lens to be brought to a predetermined position inside or outside the projector body with an extremely simple operation, and which hardly increases the manufacturing cost. It is something to do.

The Fresnel lens support device according to the present invention includes a pair of guide grooves provided along the upper edges of the inner surfaces of both side walls of the projector body, a reflective Fresnel lens fixed to the back surface, and a pair of guide grooves provided along the upper edges of the inner surfaces of both side walls of the projector main body, and a reflective Fresnel lens fixed to the back surface of the guide grooves. The upper lid is provided with a pair of pins that slide into the pair of guide grooves, respectively, and is reversible around the pair of pins.

The present invention will be described in detail below based on an embodiment shown in the drawings. Reference numeral 1 denotes a rectangular box-shaped projector body, and 2, 2 each has a lower end pivotally attached to the inner wall of the projector body 1, and a click box (not shown) is provided. A pair of pillars that can be semi-fixed at 0° and 90° angular positions with respect to the projector main body 1 by a device, 3 is pivotally connected between the upper ends of the pair of pillars 2, 2, and is connected to both pillars by a click device (not shown). 2, 0° and
The head is semi-fixed at an angular position of 90 degrees and has a light source, a projection lens, and a reflection mirror (not shown) installed inside. It is designed to be stored in the Ector main body 1 in a folded state. 4, 4 (one not shown in the drawing) is a pair of guide grooves provided on the inner surface of both side walls of the projector main body 1 along their upper edges, respectively; 5, 5 (one not shown in the drawing); is a pair of click springs (second
), 6, 6 (one not shown) are fixed to the front ends of the guide grooves 4, 4, respectively, and have elasticity acting toward the rear ends of the guide grooves 4, 4. 2), 7 is provided with a stage 9 for fixing a reflective Fresnel lens 8 and a pen tray 10 on the back side, and a pair of pins 11, 11 on both sides of the front end that slide into the guide grooves 4, 4, respectively. (Fig. 2) is implanted, 12 is a notch provided on the upper surface of the rear edge of the projector body 1, 13 is a recess provided on the inner surface of the rear edge of the projector body 1, 1
4 is provided on the lower surface of the rear edge of the upper lid 7;
These claws engage in the recess 13 when the lens is closed (FIG. 3), and these constitute a Fresnel lens support device.

Since the Fresnel lens support device according to the present invention is constructed as described above, in order to put it into use,
First, in the state shown in FIG. 3, the notch 12 is
Insert your finger into the rear end of the top cover 7 while pushing it toward the right in Figure 3, and then pull up the pins 11 and 11.
is in a state where it is supported by the arcuate leaf springs 6, 6, so that the upper cover 7 is moved slightly to the right in FIG. , the upper lid 7 is the pin 11,
The Fresnel lens 8 and the pen tray 1 are rotated to the right around 11 and turned over as shown in Fig. 1.
0 appears outside the projector body 1. Next, the columns 2 and 3 are turned 90 degrees to the left in FIG. 1 to stand up, and the head 3 is then turned 90 degrees to the left to fix them in the state shown in FIG. 4. Next, when the upper cover 7 is horizontally pushed and slid to the left in Fig. 4, the pins 11, 11 are fixed by the click springs 5, and in this state, the optical axis of the head 3 and the center of the Fresnel lens 8 are aligned. As a result, it becomes possible to project. In addition, in order to put it into a non-use state, just perform the operation completely opposite to the above, and the Fresnel lens 8 will be located inside the projector body 1 and completely protected as shown in Fig. 3. . Thus, the Fresnel lens 8 is brought to a predetermined position inside and outside the projector main body 1 by the Fresnel lens support device of the present invention, and the operation thereof is extremely simple as described above. In addition, its structure is extremely simple as described above, and since it does not require a protective cover like the conventional example, there is almost no increase in manufacturing costs.

As mentioned above, the Fresnel lens support device according to the present invention has important practical advantages in that the Fresnel lens can be brought to a predetermined position inside or outside the projector body with extremely simple operation, and there is almost no increase in manufacturing costs. have.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a reflection type overhead projector including an embodiment of the Fresnel lens support device according to the present invention with the top cover open, Fig. 2 is a perspective view of the main part of the above embodiment, and Fig. 3 and FIG. 4 are perspective views showing the reflection type overhead projector in an unused state and a used state, respectively. 1... Projector body, 2... Support, 3...
... Head, 4 ... Guide groove, 5 ... Click spring, 6 ... Arc-shaped leaf spring, 7 ... Top lid, 8 ... Fresnel lens, 9 ... Stage, 10 ... Pen plate,
11...pin, 12...notch, 13...recess,
14...Claws.

Claims (1)

[Scope of utility model registration request] A reflector comprising a projector main body, a pillar pivotally connected to the projector main body, and a head pivotally connected to the upper end of the pillar, and the pillar and the head can be folded and stored in the projector main body. In the overhead projector, a pair of guide grooves are provided along the upper edges of the inner surfaces of both side walls of the projector body;
A reflective Fresnel lens is fixed to the back surface, a pair of pins are provided on both sides of one end to slide into the pair of guide grooves, and the lid is reversible around the pair of pins. A Fresnel lens support device characterized by: