JPH068950U - Slide projector with interchangeable lens mount - Google Patents

Abstract

(57) [Summary] [Purpose] Using an interchangeable lens (such as a fisheye lens) used for shooting as a projection lens of a slide projector without modifying the slide projection so that the user can easily experience the perception of three-dimensional space. To [Structure] Attach the interchangeable lens mount to the projection lens mounting part of the slide projector.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a slide projector with an interchangeable lens mount, which enables the interchangeable lens of a camera to be used as a projection lens.

[0002]

[Prior art]

 All of the commercially available slide projectors examined by the applicant were equipped with projection lenses, and none of them made it possible to mount interchangeable lenses (for example, fish-eye lenses) for cameras. In addition, one of the related inventions relating to the two slide projectors described in the past Japanese Utility Model Bulletin that the applicant examined (Sho 57-172432, but not requested for examination) was equipped with an interchangeable projection lens. It is a possible slide projector, and the lens used for slide shooting cannot be attached to the slide projector. Another example of a projector attachment for a camera (Sho 63-80538, also unclaimed for examination) is that the lens used for slide shooting can be used as a projection lens for slide projection. The interchangeable lens is not designed to be mounted on a slide projector.

[0003]

[Problems to be solved by the device]

 Conventional slide projectors do not have interchangeable lens mounts, so to use the fish-eye lens used for shooting as a projection lens for projection, it is necessary to make considerable modifications to the slide projector, and depending on the modification method, However, there was a drawback that the lens could not be attached or removed easily.

[0004]

[Means for Solving the Problems]

 Mount the mount (2) for mounting the interchangeable lens on the slide projector body (1) through the tube (3) with the tube-shaped hole (4) and mount.

[0005]

[Action]

 Since the present proposal has the above-described structure, the interchangeable lens (for example, a fisheye lens) of the camera used for shooting can be attached to a slide projector and used as a projection lens. Moreover, the lens can be easily attached and detached.

[0006]

【Example】

 The main body of the slide projector (1) is shaped like a commercially available ordinary slide projector with the front part cut off, and at this time, a tube-shaped hole (4) is provided at the position where the projection lens is attached. On the other hand, as shown in FIG. 2, a tube was attached to the interchangeable lens mount (2) to form a tube (3) with the interchangeable lens mount attached, and this was inserted into the hole (4) of the main body. Attach the interchangeable lens. The focus is adjusted by moving the tube (3) inserted in this hole (4) back and forth.

[0007]

[Effect of device]

 The inventor has found that the following phenomenon occurs when a fisheye lens used for shooting is used as the lens of the slide projector when a slide filmed by a fisheye lens is projected on a flat screen by a slide projector (see more details: , Architectural Institute of Japan, 1991 Annual Conference Lecture Summary, 4059). The projection was according to normal perspective (straight lines as straight lines and object size inversely proportional to the square of the projection distance) (ie a slide taken with a normal lens in a normal slide projection manner). If you change the projection angle of the slide projector to the screen (left, right, top, bottom, etc.), this projection will look as if you were looking around by moving your eyes. You can experience the perception of a three-dimensional space as if you were actually there. The slide projector with interchangeable lens mount allows you to easily set the fisheye lens used for shooting on the projector, so it seems that everyone can easily look around at the scene where the shot was taken, using the slide taken with the fisheye lens. You will be able to experience the perception of a three-dimensional space. This projector can also be used as an ordinary slide projector by setting an ordinary interchangeable lens.

[Brief description of drawings]

FIG. 1 is a perspective view of the present invention.

[Figure 2] Cross-sectional view with the interchangeable lens mount part cut away

[Explanation of symbols]

(1) is the slide projector main body (2) is the interchangeable lens mount (3) is the tube with the mount attached (4) is the tube-shaped hole provided in the main body for inserting the tube of (3)

Claims (1)

[Scope of utility model registration request] 1. A slide projector with an interchangeable lens mount, wherein an interchangeable lens of a camera can be mounted as a projection lens.