JPS6148823A - Optional position projecting device of slide projector - Google Patents

Abstract

PURPOSE:To project an optional position of a slide film on a screen at an optional position by providing a slide case moving mechanism which moves a slide case where a slide film arranged movably in a plane crossing an optical axis at right angles in two orthogonal directions is inserted and extracted between a projection light source and a projection lens system. CONSTITUTION:When peripheral edge cams 23 and 24 are rotated through rotational center shafts 25 and 26 while the slide film S is stored in the slide case 20, the slide case 20 moves in two orthogonal directions in a plane crossing the optical axis at right angles, i.e. moves up and down, and right and left according to shapes of cam surfaces 23a and 24a. For the purpose, rotational positions of the peripheral edge cams 23 and 24 are adjusted and an optional part on the slide film S is moved onto the optical axis, thereby projecting the part on the center part of the screen. When a projection lens system is a zoom lens system capable of enlarged projection, the part moved onto the optical axis is projected while enlarged.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a slide projector, and in particular, to a slide projector that can project any part of a slide film onto any part of a screen without moving the entire slide projector. This invention relates to an arbitrary position projection device.

"Prior Art and its Problems" A slide projector is basically designed to project the entire slide film. Therefore, what is projected on the periphery of the slide film is also projected onto the periphery of the screen, and in order to project what is photographed on the periphery of the film onto the center of the screen, the entire slide projector must be moved. There wasn't. Furthermore, with a projector equipped with a zoom lens, it is possible to enlarge and project a portion of the image, but in this case as well, the area that can be enlarged and projected is limited to the center of the screen. However, the area to be enlarged and projected is not limited to the center of the screen, and to meet such special requirements, the only way to do so is to somehow shift the position of the slide film on the optical axis. Ta.

``Object of the Invention'' An object of the present invention is to obtain a slide projector that can project a desired position of a slide film onto an arbitrary position on a screen.

"Summary of the Invention" A slide projector of the present invention includes a slide case in which a slide film is inserted and removed, which is movably disposed in a plane orthogonal to the optical axis, between a projection light source and a projection lens system. It is characterized by having a slide case moving mechanism that moves the slide film in two directions orthogonal to each other. By moving the slide case in this way, the slide film to be inserted into and removed from the slide case can be moved to any desired position. It can be moved along the optical axis, so any position on the film can be projected onto the center of the screen.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. In FIGS. 1 and 2, 11 is a projection light source, 12L±a condenser lens system that condenses the light of this projection light source 11, and 13 is a projection lens system, which is located between the condenser lens system 12 and the projection lens system 13. , a slide case 20 is provided. This slide case 20 has regulating plates 14 and 15 on its front and rear sides.
The position in the optical axis direction is regulated by the regulating plate 1.
4.15 in a plane orthogonal to the optical axis.

12f is a heat ray absorption filter provided within the condenser lens system 12.

The slide case 20 has a rectangular shape with left and right vertical frames 16.16 and upper and lower horizontal frames 17.17 on the right, and has a projection opening 18 in the center. As shown in FIG. 3, the vertical frame 16 and the horizontal frame 17 on the left and the bottom in FIG. .

In order to make it possible to insert and remove the slide film S, it consists of a pair of parallel plane walls 21 and 21 with the bottom wall removed, as shown in FIG. 22 is a notch formed in this parallel plane wall 21 for gripping the slide film.
The slide film S can be taken in and out from either direction on the right.

Only one of them may be used.

On the opposite side of the slide case 20 from the film insertion/removal side, there are peripheral cams 23.24 that abut against the vertical frame 16 and the horizontal frame 17, respectively.
Cam surfaces 23a and 24a are formed on the outer periphery of the slide case 20 at gradually different distances from the rotation center axis 25.26. Single tension spring 2 biased to move sideways
7, it is constantly in contact with the vertical frame 16 and the horizontal frame 17.

The pivot axis 25.26 of the peripheral cam 23.24 is rotationally driven manually or by an electric motor.

Therefore, in this slide projector having the above configuration, when the slide film S is housed in the slide case 20, the peripheral cams 23 and 24 are
When rotated, according to the shape of the cam surfaces 23a and 24a,
The slide case 20 moves within a plane perpendicular to the optical axis in two orthogonal directions, that is, in the up-down direction or in the left-right direction. Therefore, by adjusting the rotational position of the peripheral cams 23, 24 and moving any part of the slide film S onto the optical axis, that part can be projected onto the center of the screen. If the projection lens system 13 is a zoom lens system capable of enlarged projection, the portion moved on the optical axis can be enlarged and projected.

In the above embodiment, in order to simplify the explanation, the slide film S is manually inserted into and removed from the slide case 20.
A cartridge 30 for the slide film S can be provided, and a mechanism for inserting and removing the slide film S from the cartridge 30 into the slide case 20 can be provided.

5 to 7 show an example of this. A slide cage ring 30 is provided in a first part of the slide case 20, and a movable insert is provided at the top of the slide case 20 and the cartridge 30. A detachable arm 31 is movably provided. The insertion/removal arm 31 is integrally provided with an insertion arm 32 and an extraction arm 33 at both ends thereof, and is capable of reciprocating linear movement along a guide rail 34. The slide case 20 is provided with a notch 35 into which the take-out arm 33 enters.

According to this insertion/removal mechanism, when the insertion/removal arm 31 is moved from the right to the left in FIG.
When the insertion/removal arm 31 is pushed inward or moved from the left to the right, the ejection arm 33 slides into the slide case 2.
Since the slide film S in the cartridge 30 is returned to the cartridge 30, the slide film S can be continuously projected by reciprocating the insertion/removal arm 31. Note that the slide case 20 should be noted in this insertion/removal mechanism.
When inserting and removing the slide film S inside the slide case 20, the slide case 20 is returned to its normal position, that is, the center of the projection aperture 18 is located at the center of the optical axis.

``Effects of the Invention'' As described above, the present invention allows the case for inserting and removing the slide film to be moved in two directions perpendicular to the optical axis, so that any position on the slide film can be projected onto any position on the screen. can do.

Furthermore, in a projector that can perform enlarged projection using a zoom lens, it is possible to enlarge and project not only the central portion but also any desired portion.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the slide projector of the present invention, FIG. 2 is a front view of the main parts, and FIGS. 3 and 4 are taken along lines mm and IV-IV in FIG. 5 is a front view showing an example of the slide film insertion/removal mechanism, and FIG.
7 are a view in the direction of the ■ arrow and a view in the direction of the ■ arrow in FIG. 5. 11... Projection light source, 13... Projection lens system, 20.
...Slide case, 16...Vertical frame, 17...Horizontal frame, 22.23...Peripheral cam, 24.25...Rotation center axis, S...Slide film.

Claims (2)

[Claims] (1) A slide case in which a slide film is inserted and removed is arranged between the projection light source and the projection lens system, and this slide case is moved in two mutually orthogonal directions within a plane perpendicular to the optical axis. An arbitrary position projection device for a slide projector, characterized in that a case moving mechanism is provided. (2) In claim 1, the slide case moving mechanism includes a peripheral cam located on the outside of the vertical frame and the horizontal frame of the slide case, and a means for rotating the peripheral cam,
An arbitrary position projection device for a slide projector comprising spring means for biasing a slide case to move in a direction to abut the peripheral cam.