JPH01179138A - Lighting device - Google Patents

Abstract

PURPOSE:To prolong the life of a light source lamp by diffusing the light of the light source at the time of recording an image. CONSTITUTION:One side 1-a, which is a glass surface,of a lighting lamp 1 is diffusing surface and the other side 1-b is transparent. In printing actions, the diffusing surface 1-a is set to a microfilm F side and light beams toward a photosensitive drum through a projection lens 5 is diffused so as to reduce the unevenness of light quantities in a center and a periphery. In case of the action of a reader, the transparent surface 1-b of the lamp 1 is set to the film F side through a lamp board 20 by rotating a knob 21 to increase the light quantity which reaches a screen, so that the image on the screen is made light enough to be easily read. Since it is unnecessary to make the lamp voltage of the light source excessive, the life of the lamp can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is applied to, for example, a microfilm reader/printer, and relates to an illumination device that illuminates a transparent original such as a microfilm to form transmitted image light. .

(Prior Art) No. 1111 is a diagram showing the optical path of a conventional microfilm reader printer. 300 is an illumination lamp, which emits light reflected by a spherical reflection mirror 301;
The translucent microfilm F is illuminated. The transmitted image light transmitted through the microfilm F is then enlarged and projected onto a screen 303 via a reader optical system 302 at the time of a reader. On the other hand, when printing an image, the image is projected onto a photosensitive drum 305 provided in the recording section via a recording optical system 304I, and electrostatically recorded. The microfilm F was illuminated with the same illumination light both during reading and print recording.

(Problem to be solved by the invention) However, in the case of such prior art, microfilm F
When the printer operates to print an image, there is a difference in the amount of light between the center and the periphery of the printed image, and the periphery becomes darker than the center of the printed image, making the printed image difficult to read. Attempts have been made to use the glass surface as a diffusing surface to reduce unevenness in the amount of light between the center and the periphery. However, with this method, when the reader operates to read the image on the microfilm F, the screen 3
Since the amount of light that reaches 03 decreases and the entire image becomes dark and difficult to read, it is necessary to increase the voltage applied to the lamp 300 when the reader is operating than when the printer is operating to increase the amount of light when the reader is operating. However, when the voltage applied to the lamp 300 is increased, the lamp 300
The voltage applied to the lamp 300 cannot be increased beyond a certain level because of problems such as increased heat generation and shortened lamp 300 life. When trying to obtain a print, the disadvantage remains that the image on the screen 303 is dark and difficult to read.

The present invention has been made to solve the above problems of the prior art, and its purpose is to diffuse illumination light only during image recording, so that it can be used both during reader and image recording. An object of the present invention is to provide a lighting device that can secure an appropriate amount of light.

(Means for solving problems) In order to achieve the above object, the present invention has the following features.

In an illumination device comprising an illumination light source that illuminates a translucent original and projects transmitted image light onto a reading screen via a reader optical system and onto a recording section via a recording optical system, the recording section The apparatus is characterized in that a diffusing means is provided for diffusing the light from the illumination light source when projecting image light onto the illumination light source.

(Function) A means is provided to diffuse the light from the illumination light source during image recording,
By removing this diffusion means during the reading operation, it is possible to take a recorded image with less unevenness in the center and periphery of the recorded image, and at the same time, when reading the image on the screen during the reading operation, a bright image with a large amount of light can be obtained. It will be done.

(Example) The present invention will be explained below based on the illustrated example. Third
The figure shows an optical path system of a reader printer to which a lighting device according to a first embodiment of the present invention is applied. That is, F is a microfilm as a translucent original, an illumination device S for illuminating this microfilm F, a reader optical system R for projecting onto a reading screen IO,
A recording optical system P for projecting onto a photosensitive drum 15 serving as a recording section is provided.

The reader optical system R includes a projection lens 5, a mirror 6°7.8.
9 and projects a film image onto a screen 10. On the other hand, the recording optical system P includes the projection lens 5,
The mirror 6.7 is common and consists of scan mirrors 11 and 12 that move forward and backward in the direction of the arrow in the optical path between the mirrors 7 and 8 of the reader optical system R, and image onto the photoreceptor drum 15 through the slit 13. It is designed to guide light.

As shown in FIGS. 1 and 2, the illumination device S includes an illumination lamp 1, a spherical reflecting mirror 2 disposed on the back side of the illumination lamp L, and a microfilm F for transmitting illumination light from the illumination lamp 1. It is composed of a reflecting mirror 3 that reflects the light to the side, and a condenser lens 4 that collects the illumination light from the lamp 1.

The illumination lamp l is fixed to a lamp stand 20, and by turning a knob 21 provided on a rod that pivotally supports this lamp stand 20, the illumination lamp l can be rotated 180 degrees in the direction of the arrow in the figure.
Can be rotated.

The illumination lamp l is placed on one side of the glass surface (1-a in the figure).

The diagonal line (shown in the figure) is a diffusion surface serving as a light diffusion means, and the other side (shown at 1-b in the figure) is transparent. During printing operation (Figure 1), a diffusion means is provided by setting the diffusion surface to the film F side as shown in Figure 1 to diffuse the light directed toward the photosensitive drum 15 and reduce unevenness in the amount of light between the center and the periphery. . Also, when the reader is operating to read the projected image on the screen (Fig. 2), turn the knob 21 to direct the transparent side of the lamp l toward the film F side as shown in Fig. 2 to increase the amount of light reaching the screen 10. and brighten the screen image to make it easier to read.

4 and 5 show a second embodiment of the present invention, a lamp 31a with a diffused glass surface and a lamp 3 with a transparent glass surface.
The two lamps 1b can be switched freely. That is, the lamp 31a and the lamp 31b are fixed to a common lamp stand 32, and this lamp stand 32 can be moved relative to the illumination housing 34 by moving a lever 33.

FIG. 5 shows the switching state when the printer is in operation, and the lamp 31a on the diffuser surface is placed on the optical path. As mentioned above, since the glass surface of the lamp is a diffusive surface, a good printed image with less unevenness in the center and periphery can be obtained. When viewing a projected image on the screen when the reader is activated, move the lever 33 in the direction of the arrow to bring it into the switching state shown in FIG. In this case, a transparent lamp 31b is placed on the optical path, and a large amount of light reaches the screen, resulting in a bright projected image. In addition, in this second embodiment, only the lamp on the diffuser side is lit when the printer is in operation, and only the transparent lamp is lit when the reader is on, so the lamp on the diffuser side is used less than when the lamp on the diffuser side is normally used. less time. Therefore,
When replacing lamps due to their service life, the number of times expensive diffuser lamps need to be replaced is reduced, which reduces the cost to the user.

6 and 7 show a third embodiment, which, like the second embodiment, includes two lamps: a lamp 31a with a diffused glass surface and a lamp 31b with a transparent glass surface. , switching is performed automatically. Lamp 31a and lamp 31
b are both fixed to a lamp stand 32, the lamp 32 is coupled via a lever 33 and a connecting lever 35 to the circumference of a circle 136, and a circle g136 can be rotated by a motor 37. The rotation of the motor 37 is the disk 36
is rotated to move the lamp stand 32 via the connection lever 35 and the lever 33, and the lamp 31a and the lamp 31b reciprocate [tl] in the direction of the arrow with respect to the illumination housing 34.

FIG. 8 depicts an overall perspective view of this third embodiment. The lamps 31a and 31b can move in a direction perpendicular to the optical path connecting the spherical reflection mirror 2 and the mirror 3, which are stationary.

FIG. 9 is a block diagram showing the control of the reader printer in this third embodiment. The CPU (202) processes the input signal (201) input from the print switch of the reader/linter device and the lamp position detection signal (205), and the motor drive circuit (208) drives the motor (207).
) is rotated to place the lamp at a predetermined position, and the printer drive circuit (203) drives the preketator (204) to print.

FIG. 10 is a flowchart of this third embodiment. When the power of the reader printer is turned on (101), the lamp position detection sensor operates and detects the position of the lamp (102).
), at this time, if the lamp is not in the leader position, that is, if the transparent lamp 31b is not placed on the optical path, the motor drive circuit will operate, the motor 37 will rotate, and the disc 36,
The lamp stand 32 is moved via the connecting lever 35 and the lever 33.103) As shown in FIG. 7, the transparent lamp 31b
is placed on the optical path, the motor is stopped, and the reader lamp 31b is turned on (104). In this state, the amount of light is large and an easy-to-read image can be seen on the screen IO.

When taking a print, the reader lamp 31b turns off according to the input signal of the print switch (105).
6), the motor 37 rotates, and the disc 36 and the connecting lever 35
, the lamp stand 32 is moved via the lever 33 (107)
, the lamp 31a on the diffusing surface is placed on the optical path as shown in FIG. 6 (108), the motor is stopped, and the printer lamp 31a is turned on (109), and then scanning is performed as shown in FIG. The mirrors 11 and 12 move in the direction of arrow A to perform a scanning operation, and the image on the microfilm F is projected onto the photosensitive drum 15 and printed through a series of copying processes (110). At this time, the illumination light is emitted from the lamp. Since the light is diffused by the diffusing surface, you can obtain prints with less unevenness in the amount of light in the center and periphery.

When the printing operation is completed, the printer lamp 31a turns off (112), and the motor 37 rotates again, causing the lamp stand 32 to turn off.
is moved in a direction opposite to the direction of movement, and a transparent lamp 31b is placed on the optical path as shown in FIG. The scan mirrors 11 and 12 move in the direction of arrow B and enter the reader operating state. At this time, as described above, an image with a large amount of light and easy to read can be viewed on the screen IO.

In the above embodiment, only the transparent lamp is lit when the reader is operating, and only the lamp on the diffuser side is lit when the printer is operating, and the lamp on the diffuser side is only lit during printing and when the printing operation ends. A transparent lamp will then turn on automatically. Therefore, compared to using a single lamp with a diffuser surface during both reader and print operations, it is easier to use the diffuser lamp by switching between the diffuser lamp and the transparent lamp. This reduces the number of times expensive diffuser lamps have to be replaced due to their service life, and the cost to the user is reduced.

(Effects of the Invention) The present invention has the above-described configuration and operation, and is provided with a diffusion means for diffusing the light from the light source when recording one image, and by removing this diffusion means during reader operation, the center and periphery of one image are It is possible to obtain a recorded image with less density unevenness, and also to obtain a bright projected image with a large amount of light during a reader operation in which the projected image is read on a screen.

Therefore, there is no need to increase the lamp voltage of the light source;
It is possible to extend the life of a lamp used as a light source.

[Brief explanation of the drawing]

1 and 2 are diagrams explaining the operation of the illumination device according to the first embodiment of the present invention, FIG. 3 is a perspective view showing the optical path system of a reader printer to which the device of FIG. 1 is applied, and FIG. 4 and 5 are diagrams similarly explaining the operation of the second embodiment, FIGS. 6 and 7 are diagrams similarly explaining the operation of the third embodiment, and FIG. 8 is an overall perspective view of the third embodiment. 9 is a block diagram of the third embodiment, FIG. 1θ is a flowchart of the third embodiment, and FIG. 11 is an overall schematic perspective view showing the optical path of a conventional microfilm reader printer. Explanation of symbols 1... Illumination lamp 2... Spherical reflective mirror 3
...Mirror 4...Condensing lens F...
Film 5...Projection lens 6.7...Mirror 8,9...Mirror lO...Screen 11.12...Scan mirror 13...Slit plate 14-@Optical drum 20...
・Lamp stand 21...Knob 31a...Diffusion lamp 31b...Transparent lamp 32...Lamp stand 33...Lever 34...Lighting housing
35...Connection lever 36...Yen @ 3
7-...Motor 3rd surface 1J4111 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 11

Claims (1)

[Claims] In an illumination device comprising an illumination light source that illuminates a translucent original and projects transmitted image light onto a reading screen via a reader optical system and onto a recording section via a recording optical system, the recording section An illumination device comprising a diffusion means for diffusing light from the illumination light source when projecting image light onto the illumination light source.