JPS644102Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for projecting a slide film using an overhead projector (OHP).

Conventionally, when projecting a slide film using a transmission type OHP, an apparatus as shown in FIG. 1 or 2 has been used. That is, the apparatus 1 shown in FIG.
, a condenser lens 4 is arranged inside, and a slide film 5 can be freely inserted and removed between the projection lens 3 and the condenser lens 4, and this device 1 is fixed to the head section 7 of the OHP 6. However, a light beam 9 from a light source provided in the base 8 enters the apparatus 1 via the head section 7, passes through the slide film 5,
I am trying to project it onto a screen.

Further, the device 10 shown in FIG. 2 is placed on the base 8 of a transmission type OHP 6, and the device 10 has a reflecting mirror 12 that changes the optical path fixed in the main body 11 bent from the middle to the side. However, a light ray 9 from a light source in the base 8 is bent by a reflecting mirror 12, and this light ray 9 is transmitted through a slide film 5 and projected onto a screen by a projection lens 3.

When projecting a slide film using a reflective OHP, a device as shown in FIG. 3 is used. That is, the device 13 has a sliding conversion lens 15 attached to the front end of a box-like main body 14, a condensing lens 16 arranged inside, and a slide film 17 which can be freely inserted and removed between the lenses 15 and 16. Reflective type OHP1 with device 13
Fixed under the light source arranged in the head part 19 of 8,
The light beam transmitted through the slide film 17 is reflected by a Fresnel reflecting mirror 20 and projected onto a screen via a projection lens 21.

Previously, slide film was projected using the device described above, but the transmission type
The disadvantage is that the equipment used for OHP cannot be used for reflective OHP, and even if the same transmissive OHP is used, it cannot be applied to different models.

The present invention was made to improve the above-mentioned disadvantages of the conventional technology, and its purpose is to improve transmission type OHP,
To provide a slide projection device that can be applied not only to reflective OHPs but to all OHPs.

In order to achieve such a purpose, the slide projection device according to the present invention has a projection lens attached to the front end of a box-shaped main body, and a holder equipped with a double-sided reflective mirror and a condensing lens rotatably installed inside the main body. Further, windows are formed on both upper and lower surfaces of the main body portion where the holder is provided, and an insertion hole for inserting and removing the slide film is formed in the main body between the holder and the projection lens.

An embodiment of the present invention will be described below in detail with reference to FIGS. 4 to 6.

FIG. 4 is an overall perspective view of the slide projector according to the present invention. The slide projector 30 includes a box-shaped main body 31 supported by leg pieces 32, 32, and a projection lens 33 on the distal end surface of the main body 31. A hole 35 for inserting a slide film 34 is formed on the side surface of the main body 31, and windows 36 are formed on the upper and lower surfaces of the rear portion of the main body 31.

In the rear part of the main body 31, as shown in FIGS. 5 and 6, a holder 37 having a triangular prism shape when viewed from the side is arranged so as to be rotatable by operating a knob 38. . This holding body 37 has each side plate-shaped or a frame body, and the concrete shape is such that the end face is a right-angled isosceles triangle. The holder 37 is rotatable as shown by the arrow around the longitudinal center line of the surface forming the base of the triangle, and a flat reflecting mirror 39 is attached to the surface forming the base. Condensing lenses 40 and 41 are attached to each surface constituting the .

An example of the use of the slide projection device having the above configuration will be explained.

First, the case of application to a reflective type OHP will be explained based on FIG. The window 36 is positioned so that it faces the window 36. By rotating the knob 38, the holder 37 is rotated so that the condenser lens 40 attached to the holder 37 faces the window 36 and the condenser lens 40 faces the slide film 34.

In this way, the light beam from the light source 45 passes through the condenser lens 4.
0 to a reflecting mirror 39, the reflecting mirror 39 converts the optical path to the side, and the condensing lens 4
1 and onto the slide film 34.
The light beam transmitted through the slide film 34 is projected onto a screen via a projection lens 33.

Next, the application to a transmission type OHP will be explained based on FIG. The slide projection device 30 is placed on a base 47 of a transmission type OHP 46 so that the window formed on the lower surface of the main body 31 faces directly above the light source 48.
Then, by rotating the knob 38, the light source 48
The converging light beam from the 2-side mirror 39 changes its optical path and reaches the slide film 34, and the light beam transmitted through the slide film 34 is directed to the projection lens 33.
will be projected onto the screen by

As is clear from the above explanation, the slide projection device according to the present invention has a holder rotatably disposed within the main body, and a reflecting mirror and a condensing lens are attached to this holder, so that even light incident from above can be detected from below. Since the slide film can be projected using either incident light, it can be applied to any type of OHP, regardless of whether it is a reflective type or a translucent type. Furthermore, the mechanism is not complicated and the operation is extremely simple as it only requires rotating a knob or the like, and has many advantages.

[Brief explanation of drawings]

The drawings show a conventional example and an example of the implementation of the present invention. Figures 1 and 2 are side views showing a conventional slide projector applied to a transparent OHP, and Figure 3 is a side view of a conventional slide projector. Reflective projection device
4 is a perspective view of the slide projection device according to the present invention; FIG. 5 is a side view of the slide projection device according to the present invention applied to a reflective OHP; FIG. The figure is a side view showing a state in which the slide projection device according to the present invention is applied to a transmission type OHP. In the drawing, 30 is a slide projection device, 31 is a main body, 33 is a projection lens, 34 is a slide film, 35 is a slide film insertion hole, 36 is a window,
37 is a holder, 39 is a reflecting mirror, and 40 and 41 are condenser lenses.

Claims (1)

[Scope of utility model registration request] A projection lens is provided at the tip of the box-shaped main body, and an insertion hole for a slide film is formed in the middle part, windows are formed on the upper and lower surfaces of the main body on the opposite side of the projection lens across the insertion hole, and In the main body, between the above-mentioned upper and lower windows, a holder having a double-sided reflecting mirror and a condensing lens attached with a predetermined positional relationship is installed between the above-mentioned upper and lower windows when used for a reflective overhead projector. The light rays incident from the lower window pass through the double-sided reflector and the condensing lens to the projection lens. A slide projection device for an overhead projector, characterized in that the slide projection device is rotatably arranged so as to reach the projection lens via the double-sided reflecting mirror.