JPH0419532Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a folding device for a reflective overhead projector (hereinafter referred to as OHP).

[Prior Art] Reflective OHPs, which have a light source, projection lens, etc. housed in the head, are characterized by being small and lightweight. Conventionally, for example, when carrying the OHP, the head part was folded into a base. The structure is such that the entire assembly is not bulky and is convenient for handling and transportation when not in use. Additionally, a Fresnel lens is installed on the base of the OHP and extends from the base, but this is fixed at a predetermined projection position regardless of whether the OHP is in use or not. It is designed to receive light and form an optical path to the projection lens.

[Problem that the invention attempts to solve]

Although such conventional reflective OHPs can be made more compact when not in use by folding the head part, the Fresnel lens still protrudes from the base, making it necessary to further downsize the device, especially when not in use. It was hot. In view of these circumstances, the present invention provides a reflective OHP that is further miniaturized.

[Means and actions for solving problems]

In the reflective OHP according to the present invention, a part of the Fresnel lens on the side opposite to the pillar protrudes from the base in the projection position, and in the storage position, this part is located within the base, and the other end part enters the support area of the pillar. The supporting member supports the Fresnel lens so as to be slidable in the horizontal direction relative to the base; the urging means urges the Fresnel lens to one of the positions; Since the apparatus includes a control member capable of sliding the support member, when the head and its support are folded into the base, the Fresnel lens is moved from the projection position to the storage position in conjunction with this folding.

〔Example〕

1 to 3 are diagrams showing one embodiment of the reflective OHP of the present invention. In FIG. 1, 1 is a base, 2 is a cover provided at one end of the base 1, and 3 is a base.
4 is a Fresnel lens whose distal end protrudes from the edge of the base 1 in the illustrated projection position and is supported in the center of the base 1 so as to be movable from the projection position to a storage position on the cover 2 side; Base end is cover 2
A pair of supports are pivotally attached to be slidable from the upright position shown in the figure to the base 1 side, and a head 5 having a built-in light source, projection lens, etc. at its tip is rotatably supported via a shaft 6. It is. Furthermore, in FIG. 2, 7 is a pedestal attached to the base 1 at the bottom of the cover 2, 8 is a substrate that stands upright on the pedestal 7 and swingably supports the base of the support column 4 via a shaft 9; 10 is a pin implanted at the tip of the support 4;
11 has one end rotatably supported by the base plate 8 via the shaft 12, and the other end fitted into a long hole 13a provided at one end of the connecting rod 13.
At least when the illustrated strut 4 is erected, a stopper 15 provided on the base 1 via the connecting rod 13 provides a stopping end for the right-handed rotation by the spring 14. a lever that is pushed by a pin 10 and swung against the spring 14 from the one stop end as the lever 4 swings from the standing position toward the base 1 side (arrow B);
A support member 16 is fixed to the other end of the connecting rod 13 and rotatably supports the Fresnel lens 3 in the center of the base 1.

Since the reflective OHP according to the present invention is constructed as described above, as shown in FIG. When the column 4 is folded in the direction of B, the pin 10 is attached to the lever 1.
1 and rotates it to the left around axis 12.
The other end of the lever 11 fits into the elongated hole 13a of the connecting rod 13 and pulls the connecting rod 13 toward the cover 2, so that the head 5 is rotated approximately 90 degrees counterclockwise relative to the column 4 as shown in FIG. However, when these are folded with respect to the base 1, the base 1
The leading edge of the Fresnel lens 3, which had been projecting out more, is completely retracted onto the base 1, and the opposite end edge of the Fresnel lens 3 enters below the base 7, and is held in the storage position shown in the figure by the support member 16. Ru. In addition, if the support 4 is rotated clockwise to stand up from the stored state of the Fresnel lens 3, the lever 1
1 is released from the pressure by the pin 10 and rotated to the right by the connecting rod 13 pulled by the spring 14, and the Fresnel lens 3 on the support member 16 is also moved from the storage position to the projection position, and the support member 16
is held in its projection position by contacting the stopper 15. In this way, Fresnel lens 3
is automatically moved in conjunction with the folding of the column 4 onto the base 1 under the control of pins 10, levers 11, connecting rods 13, springs 14, etc., and is completely placed on the base 1 in the storage position. Stored and OHP
When not in use, it can be made extremely compact.

[Effect of idea]

As mentioned above, in the reflective OHP according to the present invention, the Fresnel lens can be moved forward and backward relative to the base during projection and storage, so the size of the base can be made extremely close to the size of the Fresnel lens. When not in use, the overall external size of the OHP can be made extremely small, improving convenience in transportation, storage, etc., as well as being easy to operate.Therefore, it has extremely excellent practical advantages.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of a reflective OHP to which the present invention is applied, Fig. 2 is a partial sectional view showing a folding mechanism according to the present invention, and Fig. 3 is a perspective view showing an embodiment of the reflective OHP to which the present invention is applied.
FIG. 3 is a longitudinal cross-sectional view showing the OHP in a folded state when not in use. 1... Base, 2... Cover, 3... Fresnel lens, 4... Support, 5... Head, 8... Board,
10... Pin, 11... Lever, 13... Connecting rod, 14... Spring, 15... Stopper, 16...
...Supporting member.

Claims (1)

[Claims for Utility Model Registration] A head containing a light source and a projection lens, a support for supporting the head, and a base that rotatably supports the support at one end and holds a Fresnel lens in the center. In the reflective overhead projector, a part of the Fresnel lens on the opposite side of the support protrudes from the base in the projection position, and in the storage position, the part is located within the base, and the other end part protrudes from the base in the storage position. a support member that supports the Fresnel lens so as to be slidable in the horizontal direction with respect to the base so as to enter the support area of the support column; a biasing means that biases the Fresnel lens to one of the positions; a control member that slides the support member in conjunction with the rotational movement of the support, and moves the Fresnel lens into and out of the projection position and the storage position in conjunction with the upright and folding movements of the support. A reflective overhead projector.