JPH0342431Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to improvement of an overhead projector.

[Conventional technology]

A conventional overhead projector will be explained with reference to FIGS. 1 to 3. FIG. 1 is a perspective view thereof, FIG. 2 is a side view thereof, and FIG. 3 is a sectional view thereof.

In the figure, 1 is a halogen lamp as a light source, 2 is a light source reflection mirror, and 3 is a condenser lens, which are installed in the lamp chamber L of case C. 4
5 is a turning mirror that turns the light from the light source, and 5 is a Fresnel lens that focuses the light from the turning mirror 4.
It is located in mirror room M. The turning mirror 4 is installed diagonally and fixed, and has a structure that it cannot be moved. 6 is stage glass, Fresnel lens 5
are combined into one.

S is a storage space provided using the space under the turning mirror 4 to store a condensing projection device H, which will be described later, and can be stored by opening a lid 7 provided at the bottom. .

A is an arm for attaching a condensing projection device H, which will be described later, and is connected to the outside of the case C with a pin 8 so that it can be raised from the chain line position to the solid line position and vice versa, as shown in FIG. I made it possible to knock it down.

H is a condensing projection device, which includes a condensing lens 9 that condenses the light condensed by the Fresnel lens 5, a projection mirror 10 that projects the condensed light, and a magnifying device for enlarging the projected light. It is composed of a projection lens 11 for projecting images. 12 is a focus adjustment knob.
This condensing projection device H is detachably attached to the arm A, and when not in use, it can be removed and stored in the storage S as described above.

[The problem that the idea attempts to solve]

In this way, in the conventional projector, the turning mirror 4 is installed so as to diagonally divide the mirror chamber M of the case C into two parts, and its position cannot be changed, so the following problems occur. It was hot.

In other words, even if it is desired to have a structure in which arm A is pin-coupled inside case C and the projector is housed inside case C when not in use, condensing projection device H and arm A may interfere with turning mirror 4. I couldn't make it happen. Therefore, the arm A had to be attached to the outside of the case C, and had to be retracted as shown by the chain line in FIG. 2 when not in use. Therefore, during transportation, there was a risk that an external object such as a desk would come into contact with the arm A and damage it. In addition, when retracting arm A, remove condensing projection device H,
This requires opening the lid 7 on the back side of the case C to store the storage S, which requires a lot of man-hours for storage, and is also complicated and not functional.

This idea was created by focusing on these conventional problems, and by simply taking the arm attached to the condensing projection device in and out of the case, the turning mirror automatically moves to the use position and storage position. It is an object of the present invention to provide a functional overhead projector that is easy to operate without fear of damaging the arm by having a structure in which the arm is held.

[Means to solve the problem]

The overhead projector provided by this invention includes a case in which a Fresnel lens integrated with a stage glass is attached to the upper opening as an upper lid so that it can be opened and closed, and a light source installed inside the case.
A turning mirror is used by being held in an inclined position inside the case to turn the light from the light source toward the Fresnel lens, an arm is used while being held in an upright position inside the case, and a mirror is used at the tip of the arm. a condensing projection device attached thereto, and the condensing projection device comprises a frame having a condensing lens attached thereto and foldably attached to the arm, and a projection mirror foldably attached to the frame. The turning mirror is pin-coupled to a bearing plate fixed in the case so as to be rotatable from the tilted position to the horizontal position within the case, and the arm is pin-coupled to the bearing plate and fixed to the case. The first arm is fixed to the arm so that when the arm is folded down to the horizontal position, the turning mirror is also in the horizontal position. and a second arm fixed to the turning mirror are linked together by a link arm.

[Effect]

In the overhead projector of this invention, when the arm is raised to the upright position (use position) or folded down to the horizontal position (storage position), the first arm, link arm, and second arm are linked to each other. rotates, and the turning mirror integrated with the second arm comes to an inclined position (use position) or a horizontal position (storage position).

〔Example〕

Embodiments of this invention will be described below with reference to FIGS. 4 to 8.

Fig. 4 is a perspective view thereof, Fig. 5 is an enlarged sectional view of Fig. 4, Fig. 6 is an enlarged sectional view of the main part seen from the direction of arrow X in Fig. 5, and Fig. 7 is a condensed light in Fig. 5. A plan view of the projection device, and FIG. 8 is a sectional view showing the condensing projection device in FIG. 5 in a stored state. The same or equivalent parts as in FIGS. 1 to 3 are given the same reference numerals.

First, to explain the configuration, 1 is a halogen lamp as a light source, 4 is a turning mirror, 5 is a Fresnel lens, 6 is a stage glass, A is a pair of left and right arms, C is a case with an upper opening, and H is a light condenser. It is a projection device. The Fresnel lens 5 and the stage glass 6 function as a top cover of the case C, as will be described later.

The turning mirror 4 is pin-coupled to the left and right bearing plates 15, 15 of the case C by a pin 13 at its lower part, and is moved in the direction of arrow c, that is, from the inclined position (use position) in FIG. It can be rotated to the horizontal position (storage position) shown in the figure.

As shown in FIG. 6, the pair of left and right arms A are integrally attached to the shaft 14 at their lower ends, and are attached to the case C.
It is attached to the left and right bearing plates 15, 15 of 1 so that it can be raised and lowered in the direction of arrow a. That is, it is rotatable from the standing position (use position) shown in FIG. 5 to the horizontal position (storage position) shown in FIG.

The pair of left and right arms A and the turning mirror 4 are linked by a link mechanism. That is, both ends of the link arm 18 are connected to the first arm 16 fixed to the shaft 14 integrated with the arm A and the second arm 17 fixed to the side of the turning mirror 4, respectively, by the first pin 1.
9 and a second pin 20 to form a link. Now, arm A is in the standing position.
When the link arm 18 is pushed in the direction of arrow b as shown in FIG. Rotate, as shown in Figure 8.
It is designed to fall down to an almost horizontal position near the low wall of the case.

The position of the arm A when it is raised or lowered is determined when the guide elements 16a protruding from the first arm 16 come to both ends of the arc-shaped guide slits 15a provided on the bearing plate 15.

21 is a stopper for holding the arm in the upright position. This stopper 21 is constructed by attaching a pin 22 to the bearing plate 15, biasing it in the direction of arrow d with a spring (not shown), and fitting the recessed portion 21a provided on the biasing side into the guide element 16a. Thus, arm A can be held in an upright position. Further, as this stopper 21 is installed between the bearing plate 15 and the case C as shown in FIG. hand,
It is easy to operate. In other words, if you pinch the operator 21b and turn it in the opposite direction of the arrow d, the concave portion 21a
Then, the guide member 16a is disengaged, and the arm A can be folded down.

The Fresnel lens 5 and the stage glass 6 are stacked at intervals and assembled on the lid frame 22, and attached to the upper opening of the case C with pins 23 to form the upper lid. It is now possible to open it.

The condensing projection device H includes a frame 25 equipped with a condensing lens 24 and a projection mirror 26. Then, frame 25 is attached to arm A with pin 2.
7, and by rotating it in the direction of arrow e, it can be folded into the arm A as shown in FIG. By rotating it in the direction of arrow f, it can be folded into the frame 5, as shown by the chain line in FIG. Although not shown, the positions of the frame 25 when set and folded are determined by a stopper. Further, the pin hinge formed by the pin 28 is a friction hinge.

Next, the operation based on the above configuration will be explained.

As shown in FIG. 5, when storing the projector in use, first open the stage glass 6, rotate the projection mirror 26 in the direction of arrow f, and fold it into the frame 25. Next, turn the stopper 21 in the opposite direction of the arrow d to remove the concave portion 21.
a and the guide element 16a of the first arm 16, and while rotating the frame 25 in the direction of the arrow e as shown by the chain line, fold it into the arm A, and insert the arm A into the case C. As shown in Figure 8, lower it to a nearly horizontal position. In this process, the turning mirror 4 is linked to the arm A by the link mechanism, and therefore falls to a substantially horizontal position in conjunction with the arm A so as not to interfere with it.

The above is the procedure for storing, but the procedure for setting is the reverse of the procedure for storing.

[Effect of idea]

As explained above, according to this invention, the turning mirror is automatically held in the use position and storage position by simply taking the arm in and out of the case, so there is no need to damage the arm as in the case of conventional methods. A functional overhead projector that is easy to operate without fear can be obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional overhead projector, Fig. 2 is a side view of Fig. 1, Fig. 3 is a sectional view of Fig. 1, and Fig. 4 is a side view showing an embodiment of this invention. Figure 5 is an enlarged sectional view of Figure 4,
Fig. 6 is an enlarged sectional view of the main part viewed from the direction of arrow X in Fig. 5, Fig. 7 is a plan view of the condensing projection device in Fig. 5, and Fig. 8 is a storage of the condensing projection device in Fig. 5. It is a sectional view showing a state. DESCRIPTION OF SYMBOLS 1... Light source, 4... Turning mirror, 5... Fresnel lens, 6... Stage glass, C... Case, A... Arm, H... Focusing projection device, 24...
... Condensing lens, 25 ... Frame, 26 ... Projection mirror.

Claims (1)

[Scope of utility model registration request] A case in which a Fresnel lens integrated with a stage glass is attached to the upper opening as an upper lid so that it can be opened and closed, a light source installed inside the case, and a case that is tilted inside the case to divert the light from the light source toward the Fresnel lens. A turning mirror that is used while being held in a position, an arm that is used while being held in an upright position in a case, and a condensing projection device attached to the tip of the arm, and the condensing projection device consists of a frame foldably attached to an arm, a condensing lens attached to the frame, and a projection mirror foldably attached to the frame, and the turning mirror is mounted on a bearing fixed within a case. The arm is pin-coupled to the plate and is rotatable from the inclined position to the horizontal position within the case, and the arm is integrally attached to the shaft and rotatable from the upright position to the horizontal position on the bearing plate of the case. The arm and the turning mirror are linked by a first arm that is integrated with the shaft, a second arm that is integrated with the turning mirror, and a link arm that is pin-coupled to the first arm and the second arm. An overhead projector characterized in that the turning mirror rotates from a tilted position to a horizontal position when the arm is rotated from an upright position to a horizontal position.