JPS607417A - Projector - Google Patents

Abstract

PURPOSE:To obtain a sharp projection image having no irregularity of illuminance by rotating a lighting member which lights up an original around an optical axis. CONSTITUTION:A microfilm F is mounted on a film carrier 14. At this time, when an image of the microfilm F is longitudinally long and the lengthwise direction of the filament of a lighting lamp is parallel to the lengthwise direction of the image on the film, the lighting means is left as it is. When the image of the microfilm F is laterally long and the lengthwise direction of said filament is perpendicular to the lengthwise direction of the image, the vertical wall 30a of the base 30 of the lighting means is rotated around the optical axis Y-Y by 90 deg.. Consequently, the image of the microfilm F and the filament of the lighting lamp coincide in direction with each other, and the laterally long image is lighted uniformly; and the lighting efficiency is improved and the sharp image is projected on a photosensitive drum or screen.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection device that projects onto a projection surface on which a photoreceptor, a screen, etc. are arranged.

2. Description of the Related Art In copying devices and readers that project an image of a document such as a film onto paper or a screen, the document is usually placed on a document placement surface in an appropriate posture (orientation).

Generally speaking, there are two types of images on film: vertically long and horizontally long.The film with the vertically long image is fed, the desired image is placed on the document placement surface, and the image on this film is transferred to the photoreceptor or screen. When projecting onto a film, etc., it is good if the longitudinal direction of the filament of the illumination lamp is parallel to the longitudinal direction of the image on the film, but it is better if the longitudinal direction of the filament of the illumination lamp is perpendicular to the longitudinal direction of the vertically elongated image. Or, when the film image is horizontally long and the longitudinal direction of the filament of the illumination rung is perpendicular to the longitudinal direction of the filament, the illumination lamp may illuminate an unnecessary part or a part that is not illuminated at all. There were drawbacks such as poor lighting efficiency. However, as shown in Figure 1, when the filament of the illumination lamp is oriented in the horizontal direction as shown in A in a certain mixture, the illumination effect of the illumination lamp is・O is good, but the film image looks like H11
When it is a long image, if the illumination rung's filament i,2 is horizontally long like 1), 11<1 as in l) and the extra parts as in d and cl. The efficiency of lighting is poor.

So, the film image is A's ``Niuna4'r7i k''
However, even if the lamp is vertically long like B, it is better to use a filament of an illumination lamp that can also illuminate area C, where the illumination area is surrounded by dotted lines so that 5 points can be used for both. (This is because rectangular filaments are difficult to manufacture.) However, the filament of an illumination lamp that illuminates the area C is necessary for the necessary areas such as the diagonally shaded areas A and B. It is good to illuminate the area, but since the extra parts are also illuminated, the overall illumination efficiency is poor, and the entire image of the film projected on paper or screen becomes dark, which deteriorates the quality of the reproduced image. There have been disadvantages in that the image quality has deteriorated and the projected image is difficult to see.

The present invention provides a projection apparatus that eliminates the drawbacks of the conventional example as described above.

An embodiment of the present invention will be explained below with reference to the drawings. Fig. 2 is a sectional view of a copying machine according to an embodiment of the present invention, and Fig. 8 is a reader of an embodiment of the present invention. FIG. 4 is a cross-sectional view of the illumination part in one embodiment of the present invention.

・te1. 2 is an illumination lamp consisting of a cape-shaped filament) and a logen rank, and 2 is a concave mirror placed behind the illumination lamp 1.

3 is a condensing lens that condenses the light from the illumination lamp 1. Lighting lamp 1. Concave mirror 2. The condenser lens 3 has an optical axis X-
The light emitted from the illumination rung 1 is converged by a condenser lens 3 and reflected by a fixed mirror 4 on the left side of the condenser lens. Above the fixed mirror 4 is a condenser lens 5, and on one side of the condenser lens 5 is a projection lens 6.
There is a movable mirror 7 above, a movable mirror 8 to the left of the movable mirror 7, and below the movable mirror 8 there is a photosensitive drum 9 for horse chestnut photography.The movable mirror 7 and the movable mirror 8 are They simultaneously move in the left-right direction, that is, in a direction parallel to the X-X axis, at a speed that is half the rotational speed of the rotating drum 90.

The rotating drum 9 rotates in the direction of arrow A. projection lens 6,
The condensing lens 5 and the fixed mirror 4 are located on the optical axis Y-Y axis, which is perpendicular to the above-mentioned X-X axis. The microfilter 11 (microfiche) F is placed between the condenser lens 5 and the projection lens 60 in a direction perpendicular to the Y-Y axis of the optical axis (
・The image on the microfilm F is slit-exposed onto the photosensitive drum 9 by the movement of the mirror 7.8.

What is shown in FIG. 3 is a reader according to the present invention. Reference numeral 1 designates an illumination lamp as a light source; on the right side of the illumination lamp 1 is a concave mirror 2; on the left side of the illumination lamp 1 is a condensing lens 3; and on the left side of the condensing lens 3 is a fixed mirror 4. . Lighting lamp 1. Concave mirror 2. The condensing lens 3 and the fixed mirror 4 are on the optical axis XX axis. lighting lamp 1
The emitted light is converged by a condenser lens 3 and then reflected upward by a fixed mirror 4. Above the fixed □ mirror 4 is a condenser lens 5, and above the condenser lens 5 is a projection lens 6. There is a fixed mirror 10 above the right side of the projection lens 6, a fixed mirror 11 above the left side of the fixed mirror 10, and a screen 12 below the left side of the fixed mirror 11. The person is supposed to view the image of the screen 12 from the left side of the screen 12. Fixed mirror 11.
The projection lens 6, the condensing lens 5, and the fixed mirror 4 are located on the Y-Y axis of the optical axis. Microfilm F is projection lens 6
and the condensing lens 5 in the direction perpendicular to the Y-Y axis. With the configuration described above, the image on the microfilm F is projected onto the screen 2.

FIG. 4 shows details of the illumination section according to the invention.

Reference numeral 20 denotes a main body base box, and the upper plate 20a of this base box 20 has a round hole bored in the center so that the base 30 of the lighting means can be freely rotated through the double round holes 11); Being a person. That is, the vertical wall 3 of the base 30 of the lighting means. Q'a is inserted into the above-mentioned round hole and the upper protruding edge 3 of vertical 1% 3111
0b is fixed to the above-mentioned - plate 20a0') green. A bearing member 2 is provided between the edge of the upper plate 20a and the vertical wall 3()1.
1 is interposed. Inside the base 30 of the illumination means described above, there is an illumination lamp 1 as a light source on the right side, and on the right side of the illumination lamp 1 there is a concave surface ≦C''λ2, and on the left side of the illumination lamp 1 there is a concave surface ≦C''λ2. , there is a condensing lens 3, and on the left side of the condensing lens 3 there is a fixed mirror 4. Illumination lamp 1. Concave mirror 2.
．． The condensing lens 3 and fixed mirror 4 have optical axes X, -X 1
It's on 1111+. , )'(,Ill!(, A bright lamp 1 is emitted, converged by a condensing lens 3, and reflected upward by a fixed mirror 4. Above the fixed mirror 4 of the dirt There is a condensing lens 5.

The base 30 of the lighting means described above has an inverted shape (the vertical wall 30a has a circle f':'l), and the upper end of the vertical wall 80a forms an opening 23. Around the portion 23 there is the above-mentioned upwardly protruding edge 301). The above-mentioned condensing lens 5 faces the opening 23, and the base 30 of the above-mentioned illumination means has a projecting edge 301 locked in a round hole of the upper plate 20a of the above-mentioned base box 20. Accordingly, there is a gear rear support plate 20b directly below the plate 20a of the base box 20 described above, and this carrier support plate 20b is provided with the base of the illumination means described above. An opening 24 is provided opposite the opening 23 above the stand 30. On the upper surface of the carrier support plate 201 there is a film carrier 14, which is attached to two glass plates 12.1.
Consisting of 3 (・The lever consists of two sheets of glass 12.13
A microfilm F is held between them. A projection lens 6 is located above the film carrier 14 and housed in a cylindrical body 22. Fixed mirror described above 4. The condenser lens 5 and the projection lens 6 are located on the Y-Y axis, which is an optical axis that is perpendicular to the above-mentioned X-X axis. The microfilm F is located between the condenser lens 5 and the projection rung 6. The base 30 of the illumination means is configured to rotate by 90 degrees around the y-yr axis. Note that 20C is the bottom plate of the main body base box 20.

A detailed explanation of the present invention having the above configuration is provided below.
The microfilm F is held between the two glass plates 12 and 13 of the film carrier 14, and after loading the microfilm F into the film carrier 14Vc, copying and placing the frames in the print frame of the screen. to focus the image projected on the screen. At this time, if the image of microfilm F on the film matches the vertical and horizontal directions of the filament of the illumination lamp, then the image of -j, that is, the image of microfilm I'' on the film If the longitudinal direction of the lamp filament is parallel to the longitudinal direction of the image, leave the illumination device as it is. In other words, when the image on the microfilm is horizontally long and the longitudinal direction of the filament of the illumination lamp is perpendicular to the longitudinal direction of the image,
In other words, the base 300 vertical wall 30a is the optical axis Y −
By rotating the microfilm F by 90° around Y, the orientation of the image on the microfilm F and the filament of the illumination rung will match, allowing the illumination lamp to uniformly illuminate the horizontally long image on the microfilm F, increasing illumination efficiency. This improves the ability to project a clear image onto the photosensitive drum or screen.

Since the present invention has the above-mentioned configuration, the filament of the illumination lamp can be effectively used by rotating the illumination means by 90 degrees around the optical axis, so that the illumination intensity is less uneven. f. A clear projected image is obtained.

Further, in the above embodiment, the base 30 is rotated, but the lamp 1 may be rotated about the X axis without rotating the base 30.

The present invention can also be applied to an apparatus in which a reflective original such as Text-11 is illuminated with a fluorescent light source.

[Brief explanation of the drawing]

Figure 1 shows the effective relationship between the filaments of a lighting lamp. 4, FIG. 2 is a cross-sectional view of the reader according to the present invention, FIG. 3 is a cross-sectional view of the reader according to the present invention, and FIG. By 1jlJ! ! (
(This is a sectional view of a bright part. 1: Illumination lamp, 2: Concave mirror, 3: Condensing lens. 4: Fixed mirror, 6: Projection lens, 7, 8: Moving mirror, 9: Photosensitive drum, 10, 11; Fixed mirror. 12; Screen, 12. J3; Plate glass, 20: Main body base box, 20a: Upper plate, 20+3, 2 (l c: ;
Bottom plate carrier support plate, 21; Bearing member, 22: I
”]fi'+f Book, 23.24; Opening, A; Horizontal image, It; J1g no image, F; Microfilm Figure 1 Moe 2 Figure 3

Claims (1)

[Claims] A projection device that projects an image of a document onto a projection surface, and is characterized by rotating an illumination unit that illuminates the document around an optical axis.