JPH02287528A - projection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to, for example, a copying machine equipped with a projector.

(Prior Art) Conventionally, devices in which a projector is mounted on a copying machine are widely known. In this device, a 35 mm size negative or positive film is held in the projector and enlarged and projected onto the platen glass, or the above film, 4 x 5 inch film or O
A transparent original for HP (overhead projector) is placed and illuminated with light from a light source installed in the projector.
This projected image is scanned by a scanning device provided in the image scanner section of the copying machine to read the image. The image is then copied by the printer section of the copying machine based on the read image information.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned prior art, the light source of the projector simultaneously irradiates the entire scanning surface on which the image is scanned on the document table; Since the distance is large, the amount of light irradiated by the light source is large and a large amount of power is consumed. For example, when scanning a document by illuminating it with the light source of the image scanner section, the total amount of light per unit time is approximately 4000.
J2m, but when using a projector it is about 15m.
000βm, consuming a large amount of power of 400W or more.

For example, when the light source of the projector illuminates the entire A4 size surface of the document table glass, the irradiation width of the light source in the sub-scanning direction (direction of movement of the scanning device) is 297 mm (
The length in the longitudinal direction of A4 size), but the width in the sub-scanning direction in which the image is read during image reading scanning is approximately 1/16 mm. At this time, the proportion of light that is effectively used to read the white image of the irradiated light is 1/16 [mml ÷ 297 [mml x 100[%]
] Cape 0.02[%1, and 99.8% of the light is not used and is emitted in vain.

Therefore, in the above-mentioned conventional technology, a large amount of power is unnecessarily consumed, and the light source that consumes a large amount of power generates a large amount of heat, and the quality of the film and surrounding components deteriorates due to the heat generated by the light source. There was a problem that the service life was shortened. Furthermore, in order to use a light source with a large amount of illumination light,
Another drawback was that the device became larger.

The present invention has been made in order to solve the problems of the prior art described above, and its purpose is to reduce energy consumption such as electric power, and prevent quality deterioration of transparent originals and peripheral materials due to heat generated by the light source. The object of the present invention is to provide a projection device that can perform

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a projection image in which a transparent original is irradiated with a light source and projected onto the original table, or a projection image placed on the original table. In a projection device in which an image of a transparent document irradiated with light from the light source is scanned by a scanning device, the light source irradiates only a part of the image, and the projection light is moved in accordance with the scanning of the scanning device. It is characterized by causing

(Function) In the device of the present invention having the above configuration, the amount of illumination light from the light source can be reduced by irradiating only a part of the image with the light source, so energy consumption such as electric power can be reduced. .

Further, by moving the projection light of this light source in accordance with the scanning of the scanning device, the entire image can be scanned without any problem.

(Examples) The present invention will be described below according to illustrated examples. 1st
FIG. 2 is an explanatory view showing a projector portion of a projection apparatus according to an embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view showing the overall structure of the apparatus in which this projector is mounted on a copying machine.

In FIG. 2, a projection device 1 includes an image scanner section 2 of a copying machine 50 and a projector 3 mounted on the image scanner section 2.

As shown in FIG. 1, inside the projector 3, a lamp house 5 housing a lamp 4 as a light source is installed so as to be movable in the vertical direction in the figure by a stepping motor 6. Then, the light generated from the lamp 4 is reflected by the reflecting mirror 7 and condensed by the condenser lens 8, and the 35-m transparent original held in the film holder 9 is exposed.
A film F of m size is irradiated, and the transmitted light is irradiated through the projector lens 10 toward the reflecting mirror 11 of the image scanner section 2 shown in FIG.

Further, the projector 3 is provided with a projector control section 12, and this projector control section 12 is operated based on a control signal 31 sent from a league control section 30 provided in the image scanner section 2 shown in FIG. Lamp 4
and the rotation of the stepping motor 6.

The transmitted light of the film F irradiated from the projector 3 is
As shown in FIG. 2, the light is reflected by the reflecting mirror 11 and made into parallel light by the Fresnel lens 13, and then reflected onto the document table glass 1.
The image is formed on 4. This optical image is transmitted to the C
The image is projected onto the CD line sensor 20 and read. The scanning device 15 includes a first optical bench 21 on which a mirror 16 is installed and a second optical bench 2 on which a mirror 17.18 is installed.
2, the first optical bench 21 moves at a speed V, and the second optical bench 22 moves synchronously in the horizontal direction in the figure at a speed Hy to scan an image.

Note that without placing the film F inside the projector 3, a transparent original such as a film of various sizes or an OHP original is placed on the original platen glass 14, and the light from the lamp 4 of the projector 3 is irradiated, and the scanning device 15, it is also possible to scan this transparent original and read the image.

Next, the operation of the projector 3 during image scanning will be described.

First, when the operator presses a projector mode switch and a copy switch (not shown), image reading and copying in the projector mode is started. At this time, the lamp control signal 31a is sent from the league control section 30 to the projector control section 12, and in the projector control section 12,
A voltage proportional to the voltage of the lamp control signal 31a is applied to the lamp 4.
By outputting the signal to , the lamp 4 lights up. For example, when the proportionality constant is 5, a voltage of 15V is output from the projector control section 12 when the lamp control signal 31a is 3■, and a voltage of 25V is output when the lamp control signal 31a is 5■. The light generated from the lamp 4 is transmitted to the film F held in the film holder 9.
(the upper part of the film F in Figure 1, the lower part of the film F in Figure 3)
4.

Further, a speed instruction signal 31b that controls the moving speed of the lamp house 5 according to the copy magnification is sent to the reader control unit 30.
from there to the projector control section 12. For example, the reading scanning speed ■ of the first optical bench 21 during full-size copying is 160
mm/sec, scanning length in the sub-scanning direction is 297 mm (A
4 size length in the longitudinal direction) and the moving distance of the lamp house 5 during reading scanning is 36 mm (length in the longitudinal direction of 35 mm size film F), the speed V of the lamp house 5 is v□36 [mml÷297[mml/160[mm/]
5ecl! If d9.4 mm/5 ecl, the lamp house 5 moves a distance corresponding to the scanning length of the first optical bench 21. Therefore, from the league control unit 30, 19.4
[After sending the value 194 corresponding to mm/5ecl as the speed instruction signal 31b to the projector control unit 12 via a 10-bit signal line, the start signal 31c for starting the movement of the lamp house 5 is sent to the projector control unit 1.
2, the stepping motor 6 starts rotating.

After the reading scan is completed, a return signal 3 is sent from the reader control unit 30.
1d is sent to the projector control unit 12, and the first optical bench 21 and the second optical bench 22 are operated at high speed, for example, V = 80.
The lamp house 5 is moved from the scan end position to the scan start position at a speed of 0 [mm/5 ecl], and the lamp house 5 is also returned to its original position at a high speed, for example, at 100 [mm/5 ecl].

The image on the film F is irradiated with light from the lamp 4 one part at a time from the top to the bottom, and the light images of the parts are sequentially focused on the document table glass 14 from left to right in FIG. The images are scanned one after another by the scanning device 15. In this way the film F
The image is full page.

The CCD line sensor 20 reads the data.

The read image information is separated into components for each color in the signal processing section 23 and sent to the laser driver 25 of the printer section 24.
The laser driver 25 modulates and drives the semiconductor laser 26 based on this image information. This laser beam passes through the polygon mirror 27°f-theta lens 28. The photosensitive drum 32 is scanned through the mirror 29 to form an electrostatic latent image, and this latent image is applied to the magenta developing section 33a, cyan developing section 33b, yellow developing section 33c, and black developing section 33d of the rotary developing device 33. Developed by

Then, the paper fed from the paper cassette 34 or 35 is wound around the transfer drum 36, and as the transfer drum 36 rotates, the image formed on the photosensitive drum 32 is transferred to the paper, and then the paper is transferred to the fixing unit 37. The paper passes through and is discharged onto the tray 38.

FIG. 4 is an explanatory diagram showing a projector portion in a projection apparatus according to another embodiment of the present invention. In the figure, the same parts as in FIG. 1 are denoted by the same reference numerals, and explanations thereof will be omitted.

In this embodiment, a projector 40 shown in FIG. 4 is mounted on the image scanner section 2 of the copying machine 50 used in the above embodiment, and this projector 40 includes three lamps 41a.

A light source 41 consisting of 41b and 41c is provided. During image reading and scanning, the lamps are sequentially turned on one by one, and the light is reflected by the reflector 42, and the light is reflected by the condenser lens 4.
3 and irradiates a part of the film F. Then, as shown in FIG. 5, the lamps 41a, 41b, and 41c are sequentially turned on in accordance with the reading scan performed by the scanning device for each color.

By turning off the light, only a portion of the film F is irradiated with light during reading scanning, and the projected light is moved in accordance with the scanning of the scanning device.

At this time, when lighting the lamps one after another, the - lamp is gradually dimmed while the other lamp is gradually increased, so that the image area scanned by the scanning device is always projected with an appropriate amount of illumination light. can do. Also,
Although three lamps are provided in this embodiment, the present invention is not limited to this, and by providing a plurality of lamps, for example, four or more, more appropriate light amount control can be performed.

In each of the above embodiments, the projection light was moved by moving the light emitted from the light source of the projector, but the present invention is not limited to this. For example, the optical system of the projector may be changed. The projection light may be moved by rotating or by moving or rotating a reflecting mirror provided on the document table.

(Effects of the Invention) The present invention has the above-described configuration and operation, and reduces the amount of light irradiated by the light source by moving the projection light that illuminates only a part of the image with the light source in accordance with the scanning of the scanning device. Moreover, the entire image can be scanned without any problem.

Therefore, energy consumption such as electric power is reduced, and the quality of the transparent original and surrounding components is prevented from deteriorating due to heat generated by the light source, thereby extending the service life.

Furthermore, by using a light source with a small amount of illumination light, the device can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the projector portion of a projection device according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view showing the overall configuration of the device in which the projector is mounted on a copying machine, and FIG. FIG. 4 is an explanatory diagram showing a state in which light is irradiated to the lower part of the film, FIG. 4 is an explanatory diagram showing a projector part in a projection apparatus according to another embodiment of the present invention, and FIG. 5 is a time chart showing the operation in the same embodiment. be. Explanation of symbols 1... Projection device 3... Projector 4...
Lamp (light source) 6...Stepping motor 14...Original table glass

Claims (1)

[Scope of Claims] A projection image of a transparent original irradiated by a light source and projected onto a document table, or an image of a transparent document placed on the document table and irradiated with light from the light source is scanned by a scanning device. A projection device, characterized in that the light source illuminates only a part of the image, and the projection light is moved in accordance with the scanning of the scanning device.