JPS63142339A - Projecting device - Google Patents

Abstract

PURPOSE:To miniaturize a device on the whole by varying the enlargement projection magnification of a projection optical system as to 1st and 2nd attitude images while interlocking it with mutual rotational conversion between the 1st and 2nd attitude images by the rotational operation of a prism for image rotation. CONSTITUTION:When the prism 3 for image rotation is rotated forward and backward around an optical axis by 45 deg., two kinds of projection lenses (single- focus lens) 2A and 2B which have different high magnification and low magnification are put on the optical axis alternately by switching associatively with the rotation. A monitor screen 6 is a laterally long screen which has size and an outward appearance nearly corresponding to laterally long attitude images Fa' and Fb' of an enlarged projection image on the screen. When the prism 3 for image rotation is at an angular angle position for projecting a projection image on the screen an the laterally long attitude image, the projection lens 2A with the high magnification (short focus) is put on the optical axis and the laterally long attitude image is projected nearly to the entire surface range of the laterally long screen 6. Thus, the screen is miniaturized to reduce the overall size of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention [Field of Industrial Application] The present invention relates to a projection device. More specifically, the present invention relates to a projection device that can freely rotate an enlarged cedar image on a projection screen into a horizontally elongated image or a vertically elongated image by rotating an image rotation prism inserted in an enlarged projection optical system.

[Conventional technology]

For convenience, the explanation will be given using a league printer for macro film as an example.

Figure 4 shows a so-called single-mirror scanning optical system as an example of a league printer's projection optical system.
A film frame image illumination device consisting of a condensing lens, a heat insulating filter, etc., F is a micro film (roll film, fish film, strip film, etc.) and 4"
One frame image portion is manually or automatically retrieved and located at the illumination device position. 2 is an enlarged projection lens, 3 is a prism for image rotation, 4 is a rotating mirror for image scanning that is driven to rotate around a support shaft 4a, 5 is a fixed first mirror, 6 is a monitor screen, and 7 is a fixed first mirror. 2 mirror, and 8 indicates a printing mechanism section.

When the rotating mirror 4 is used as an image monitor (reader), it is held at the first angular posture position shown by the solid line, and as a result, the illumination device 1→projection lens 2→image rotation prism 3→fixed first mirror 5→monitor A monitor system optical path leading to the screen 6 is constructed, and the target film frame image located at the illumination section is enlarged and projected onto the screen 6 at a predetermined magnification factor N.

When a print button (not shown) is pressed, the control system of the print mechanism section 8 is turned on, and the photosensitive drum 9 is driven to rotate at a predetermined speed. The printing mechanism section 8 is, for example, a transfer type electrophotographic mechanism, and the figure shows only the photosensitive drum 9 of the mechanism as a representative. Then, the image scanning rotating mirror 4 is switched to a second angular attitude shown by a two-dot chain line 4' about the support shaft 4a. As a result, the reflected light from the mirror 4 is switched from the first fixed mirror 5 side to the fixed second mirror 7 side.
is from its second angular attitude position 4 to the third position indicated by the two-dot chain line 4'.
The photosensitive drum 9 is rotated by a drive system (not shown) at a predetermined constant rotational angular velocity that is synchronized with the circumferential rotational speed of the photosensitive drum 9 up to the angular posture position. As a result, the light incident on the mirror 4 from the projection lens 2 and the image rotation prism 3 is scanned by the rotation of the mirror, and a projected image is focused on the surface of the rotating photosensitive drum 11, which is a recording medium, via the fixed second mirror 7. imaged. That is, by rotating the mirror 4, an enlarged image of a film frame image is slit-exposed on the surface of the rotating photosensitive drum 9, and an enlarged toner image corresponding to the desired film frame image is formed on the circumferential surface of the rotating photosensitive drum 9 according to the known image forming principle. are sequentially formed, and the toner images are sequentially transferred onto the surface of a transfer material fed to a transfer section in synchronization with the rotation of the drum, and the transfer material is outputted to a tray via a fixing device. That is, an enlarged copy of the desired film frame image is printed out.

The image rotation prism 3 can be freely rotated about the optical axis, and the projected image on the screen 6 is rotated by the rotation operation. When rotated by 45 degrees, the projected image on the 6 screens will be 9.
Moves 00 times.

If the image photographed and recorded in the target frame portion of the microfilm F is, for example, a horizontally elongated image Fa with the top and bottom oriented horizontally as shown in FIG. The image is also oriented horizontally as shown by the two-dot chain line Fa in Fig. 6(a), making it difficult to read.In such a case, rotate the image rotating prism 3 by 45 degrees.
By rotating the horizontally projected image F a' on the 6th surface of the screen by 90 degrees, the attitude is changed to a vertically oriented projected image with the top and bottom facing up and down as shown by the solid line Fa. I can do it.

If the image recorded in the target frame of the microfilm F is a landscape image Fb with the top and bottom in the vertical direction as shown in Figure 5(b), the image will be displayed on screen 6 as shown in Figure 6(b). As shown by the solid line Fb', the image is enlarged and projected as a horizontally elongated image with the top and bottom in the downward direction, so there is no need to change the posture using the image rotation prism 3.

The corresponding area on the monitor screen 6 of the image effective print range by the printing mechanism 8 is shown in FIG. 6(a) and the same figure (
Assuming that the area corresponds to the horizontally enlarged projected images Fa and Fb in b), the image Fa enlarged and projected in a vertically long position on the screen 6 as shown by the solid line in FIG. Since part of the side and part of the ground side will be outside the print area, in this case, rotate the image rotation prism 3 to return the image direction to the horizontal image Fa on the screen 6 before printing. You will have to press the button.

[Problem that the invention seeks to solve]

Therefore, the monitor screen 6 of the conventional device of this type can display the entire image portion of both the vertically elongated enlarged image Fa and the horizontally elongated enlarged image Fb (Fa') within its area range without image defects. The screen is approximately square, with one side having a dimension approximately corresponding to the long side of the enlarged projected image. When a vertically long enlarged image Fa is projected, this approximately square screen is placed on the left and right sides of the screen, as shown in FIG. 6(a), and when a horizontally long enlarged image Fb is projected, as shown in FIG. 6(b). This creates a fairly large unnecessary area on the top and bottom sides, and the area is large both in relation to the vertically elongated enlarged image and in relation to the horizontally elongated enlarged image, and this large approximately square screen occupies the entire device. This is one of the reasons for the increase in size.

An object of the present invention is to reduce the size of the entire device by making the screen 6 as small as possible in terms of area.

mouth, composition of invention [Means for solving problems] The present invention is.

In a projection device that can freely rotate and convert an enlarged projected image onto a projection screen into a horizontally oriented image or a vertically oriented image by rotating an image rotation prism inserted in an enlarged projection optical system, the enlarged projected image onto the projection screen is rotated freely. When one of the horizontally long posture image or the vertically long posture image is the first posture image and the other is the second posture image, the projection screen has a size that approximately corresponds to the first posture image at a predetermined enlarged projection magnification to be projected onto the screen. The second attitude image has an enlarged projection magnification that is entirely within the plane range of the projection screen. The enlarged projection magnification of the first attitude image is set to be smaller than the enlarged projection magnification of the first attitude image, and the enlarged projection of the projection optical system is performed in conjunction with rotation conversion between the first attitude image and the second attitude image by rotational operation of the image rotation prism. The magnification is the enlarged projection magnification for the first pose image and the second
The gist of the present invention is a projection device characterized in that it is configured to mutually change the enlargement projection magnification of the pose image.

[For production]

When the image rotation prism is rotated to convert the projected image onto the screen into a first attitude image or a second attitude image,
In conjunction with this conversion, the projection magnification of the projected image on the screen of the projection optical system is mutually changed in a predetermined manner between the first attitude image and the second attitude image. The enlarged projected image in the first attitude is projected to cover substantially the entire area of the screen, which has a size and outline shape that substantially correspond to the enlarged projected image in the first attitude.

(2) In the case of the second attitude image, it is projected as an image with a smaller enlargement projection magnification than the first attitude image so that the entire image fits within the surface range of the screen without image defects. Although the projected image in the second position has a smaller enlargement projection magnification on the screen surface than the image in the first position, the readability of the image does not actually deteriorate significantly and there is no problem in practice.

Therefore, the screen can be of a size and outline shape that approximately corresponds to the enlarged projected image in the first attitude, and has a smaller area than the conventional approximately square screen mentioned above, with no unnecessary surface portions. can be made smaller.

〔Example〕

An example in which the present invention is applied to the league printer shown in FIG. 4 will be described.

As shown in FIGS. 1(a) and 1(b), the projection optical system rotates the image rotating prism 3 by 45 degrees forward and backward around the optical axis. Projection lenses (single focus lenses) 2A and 2B are arranged to intervene on the optical axis in an alternating manner.

As shown in FIGS. 2(a) and 2(b), the monitor screen 6 displays a horizontal orientation image Fa* of an enlarged projected image on the screen.
It is a horizontally long screen with a size and outline shape that approximately corresponds to Fb. This horizontally long screen is shown in Figure 6 (a) and (b).
It is smaller in area than the conventional approximately square screen.

When the image rotation prism 3 is at a rotational angle position where the image is projected as a horizontally elongated image onto the screen 6, a high magnification (short focal length) projection lens 2A is located on the optical axis (FIG. 1(a)).
has intervened, and the horizontal posture image is shown in Figure 2 (a) +7)
The two-dot chain line F a', the solid line F b' (7
), the image is projected over substantially the entire area of the horizontally long screen 6.

However, since the horizontally oriented image indicated by the two-dot chain line Fa in Fig. 2(a) has its top and bottom facing horizontally and is not comfortable to read, the image rotation prism 3 must be rotated by 45 degrees so that the top and bottom are vertical. The image is rotated by 30 degrees so that it becomes a oriented image. Then, in conjunction with the rotation of the prism 3, a low magnification (long focus) projection lens 2B (FIG. 1 (b)) is attached to the optical axis of the lens 2A. and intervening in a switching manner. As a result, the image rotated vertically is placed on the horizontally long screen 6 by the solid line HoFa in FIG. 2(a).
The entire image is projected onto the screen as a low-magnification image that fits within the area of the screen. This portrait converted image/
Although the enlarged projection magnification of the image Fa on the screen surface is smaller than that of the horizontal image FaaFb, the legibility of the image does not actually deteriorate significantly, and there is no problem in practical use.

For example, when the vertical and horizontal effective and r-law of the horizontal screen 6 are respectively 210 mm and 297 mm, and the magnification β of the high-magnification projection lens 2A is 30 times, the magnification α of the low-magnification projection lens 2B is α. = 30X -= 21.2
By setting it to , the horizontally oriented image Fa, which is projected by the projection lens 2A with high magnification β over almost the entire area of the horizontally long screen 6, is turned into a vertically oriented image Fa by rotating the image rotation prism 3 by 45 degrees. When the rotational conversion is performed, the vertically rotated image Fa is projected such that the entire image is contained within the surface range of the horizontally long screen 6 without any gaps.

The corresponding viewing area of the image effective print range by the print a structure 8 on the monitor screen 6 is the vertical and horizontal effective dimension range of the screen 6, and as described above, rotational conversion is performed on the screen 6 as a vertical image Fa. If you want to get a print of the image you viewed and read, use the image rotation prism 3 at 45
By rotating the prism 3 back, the line image Fa returns to the horizontal projected image F a'.
A high-magnification projection lens 2A intervenes on the optical axis in conjunction with the 45° return rotation of the screen 6, resulting in a high-magnification image that covers the entire vertical and horizontal effective dimension range of the screen 6. Next, by pressing the print button, an enlarged image print corresponding to the magnification of the high magnification projection lens 2A is output.

The mechanism for alternately interlocking and switching the high magnification projection lens 2A and the low magnification projection lens 2B accompanying the rotational operation of the image rotation prism 3 can be various mechanisms such as a gear interlocking mechanism, a cam interlocking mechanism, a wire interlocking mechanism, etc. . It is also possible to change the magnification by using a zoom lens as the projection lens and performing a zooming operation on the zoom lens system in conjunction with the rotation operation of the image rotation prism 3. It is also possible to do this using Ata 7 Chimenotrens.

FIG. 3 shows a specific example of the mechanism (gear interlocking mechanism), in which the image rotating prism 3 fixed to the gear 10 and the gear 1
It is composed of a high magnification projection lens 2A and a low magnification projection lens 2B fixed at 1. Image rotating prism 3 for print poetry
and is projected by the high magnification projection lens 2A. During monitoring, gear 10 rotates the image rotating prism 456 times, and gear 1 simultaneously rotates the image rotating prism 456 times.
The gear 11 interlocked with the lens 0 rotates to switch the lens to the low magnification projection lens 2B, and projects an image rotated by 90 degrees and with a different magnification onto the monitor screen 6.

The screen 6 is a vertically long screen with a size and outline that approximately corresponds to the vertically long posture image of the enlarged projection image for the screen, and the horizontally long posture image is in a state where the entire image is contained within the surface range of the vertically long screen without any missing part of the image. It is also possible to use a configuration that projects at a low magnification such that

C. Effects of the Invention As described above, according to the present invention, it is possible to miniaturize the screen and miniaturize the entire device, and it is useful for microfilm reader printers, leagues, and other types of projection devices. This is effective and suitable for miniaturizing the device.

[Brief explanation of the drawing]

Figures 1(a) and 1(b) each show a state in which a high-magnification projection lens or a low-magnification projection lens is alternately switched and intervened on the optical axis in conjunction with the rotation operation of the image rotation prism. , Figures 2 (a) and (b) are diagrams showing enlarged images projected onto a horizontally long screen, Figure 3 is a perspective view of a specific example of the mechanism, and Figure gS4 is an example of a microfilm league printer. Schematic diagram showing the optical system of FIG. 5(a)
・(b) is a diagram showing the posture of each frame image taken and recorded on microfilm, and Figures 6(a)-(b)
) is a diagram showing a state in which an image is enlarged and projected onto a substantially square screen surface. 1 is a film frame image illumination device, 2-2A-2B is a projection lens, 3 is an image rotation prism, 4-5 and 7 are mirrors,
6 is a monitor screen, 8 is a printing mechanism, 9 is a photosensitive drum, F is a microfilm, Fa*FbaFa@F
b is an enlarged projection image projected on a screen. Figure 6 (b) Figure 2 (b) Figure 5 (a) (b) Figure 1 (b) (Q) Figure 3

Claims (1)

[Claims] (1) In a projection device in which an enlarged projected image on a projection screen can be rotationally converted into a horizontally oriented image or a vertically oriented image by rotating an image rotation prism inserted in an enlarged projection optical system, One of the horizontally long posture image or the vertically long posture image of the enlarged projection image is a first posture image,
When the other image is the second attitude image, the projection screen has a size and outline shape that approximately corresponds to the first attitude image with a predetermined enlarged projection magnification to be projected onto the screen, and the enlarged projection magnification of the second attitude image is The first attitude image and the second attitude image are set to be smaller than the enlarged projection magnification of the first attitude image, which is entirely within the plane range of the projection screen, and the first attitude image and the second attitude image are obtained by rotating the image rotation prism. The enlarged projection magnification of the projection optical system is adjusted to the enlarged projection magnification of the first attitude image and the second attitude image in conjunction with mutual rotational conversion.
A projection apparatus characterized in that the projection apparatus is configured to mutually change the enlargement projection magnification of the posture image.