JPH0438343Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a slide projector that is capable of projecting a slide film using both a lens and a camera body.

A slide projector is an essential item when viewing slide films, and conventional products include a projection lens system, a slide guide for advancing and retracting a slide holder, and a slide illumination system as essential components. Among these, the projection lens system does not have such high optical performance in conventional products because it is necessary to keep the price of the entire slide projector low.

On the other hand, it is thought that people who observe slide films generally own a camera, especially a single-lens reflex camera. Camera lenses, especially the optical interchangeable lenses of single-lens reflex cameras, are naturally designed for photographing, so their optical performance is incomparably higher than projection lenses for slide projectors.

Based on this knowledge, the present invention was based on the idea of using a camera in the projection system of a slide projector. a slide holder guide, a slide holder movably supported by the slide holder guide, a slide illumination system located on the back side of the slide holder guide, and integrally provided at the lower part of the slide holder guide and slide illumination system, The present invention is characterized in that a slide projector adapter is constructed from a fixing plate extending forward and a fixing screw supported by the tip of the fixing plate and screwed into a tripod screw hole on the lower surface of the still camera body.

The invention will now be described with reference to the illustrated embodiments. The slide projector adapter of the present invention includes a slide holder guide 11 and a slide illumination system 12. The slide holder guide 11 has an opening 15 corresponding to the aperture 14 of the camera 13, and the upper and lower sides of this opening 15 form positioning parts 17, 17 that can come into contact with the film guide rails 16, 16 above and below the aperture 14. There is. Further, this slide holder guide 11 is connected to the slide holder 18.
It has a guide rail 19 that movably guides the.

The slide holder 18 has holding frames 21 and 21 for holding the slide film 20 on its left and right sides, respectively.
0 can be kept and exchanged.

The slide illumination system 12 provides illumination light to the slide holder guide 11, and has a light source 22, a reflecting mirror 23, and a condenser lens 24, and a heat shielding filter 25 is appropriately inserted into the condenser lens 24. .

The slide holder guide 11 and the slide illumination system 12 are integrated by a fixing plate 26 on the lower surface thereof. The fixing plate 26 extends in front of the slide holder guide 11, and a fixing screw 28 that can be screwed into the tripod screw hole 27 on the bottom of the camera 13 is rotatably supported at the tip of the fixing plate 26 so as not to fall off. ing.

This slide projector adapter with the above configuration is attached to the camera 13 by screwing the fixing screw 28 at the tip of the fixing plate 26 into the tripod screw hole 27 of the camera 13 with the back cover opened or removed. In cooperation with 13 lenses 29, it becomes a slide projector. That is, the shutter of the camera 13 is set to the bulb state and fully opened, and the mirror 30 is opened fully.
with the light source 22 raised to the solid line position in Figure 3.
When turned on, the light enters the condenser lens 24 directly or via the reflecting mirror 23. The light focused by the condenser lens 24 illuminates the slide film 20 held by the holding frame 21 of the slide holder 18, and then enters the camera lens 29.
A camera lens 29 forms an image of the slide film 20 on a projection surface 31. The slide film 20 is replaced on the side of the holding frame 21 that protrudes from the slide holder guide 11.

If the camera 13 is a single-lens reflex camera, a different magnification or projection distance can be selected by replacing the camera lens 29 and using one with a different focal length. In this case, it is desirable to be able to adjust the position of the condenser lens 24 in the optical axis direction in order to cope with conditions such as the pupil position of the interchangeable lens.

In addition, when this adapter is attached to the camera 13, in order to bring the slide film 20 as close as possible to the film surface of the camera 13, the upper and lower positioning parts 17, 17 of the slide holder guide 11 and the film guide rails 16, 16 of the camera 13 are connected. It is desirable that they be in close contact or that the gap between them be as small as possible.

As mentioned above, the slide projector adapter of the present invention is attached to a camera and projects a slide film using the lens, so although the price of the adapter itself is low, it can produce high results due to the high-performance camera lens. It can be used as a slide projector with image performance. In particular, the present invention provides a fixing plate that extends forward from the slide holder guide and the slide illumination system, and a fixing screw that is screwed into the tripod screw hole of the still camera body. It can be easily positioned and fixed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the slide projector adapter of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a sectional view of the slide projector adapter in a state where it is attached to a camera. 11...Slide holder guide, 12...Slide illumination system, 13...Camera, 14...Aperture, 15...Opening, 18...Slide holder, 2
0...Slide film, 21...Holding frame, 22
... Light source, 23 ... Reflector, 24 ... Condenser lens, 26 ... Fixing plate, 27 ... Tripod screw hole,
28...Fixing screw, 29...Camera lens.

Claims (1)

[Scope of utility model registration request] a slide holder guide located on the back side of the aperture of the still camera body with the back cover released or removed; a slide holder movably supported by the slide holder guide; and a slide illumination system located on the back side of the slide holder guide. and;
A fixing plate that is integrally provided at the bottom of the slide holder guide and the slide illumination system and extends further forward; and a fixing screw that is supported by the tip of the fixing plate and screwed into the tripod screw hole on the bottom surface of the still camera body. A slide projector adapter utilizing a camera, characterized in that: