JPS58106576A - Exposure quantity controller - Google Patents

Abstract

PURPOSE:To always obtain a good copy, by providing a means for controlling the voltage applied to an exposure light source, a means for displaying the exposure quantity in accordnace with exposure light source voltage, and a means for relatively shifting the exposure light source voltage against display of the exposure quantity. CONSTITUTION:A lamp regulator 632 is an electric power supply for applying the voltage to a light source lamp 5, and the applied voltage is controlled by feeding back the applied voltage to the lamp regulator 632. When the feedback voltage to the lamp regulator 632 is small, the applied voltage to the light source lamp 5 becomes small, and when the feedback voltage is large, the applied voltage to the light source lamp 5 becomes large. The feedback voltage to the lamp regulator 632 is supplied through variable resistors VR3, VR4, 631a and 631b from the light source lamp 5, therefore, when an exposure quantity adjusting knob 547 is turned clockwise, these resistance values become large, therefore, the feedback voltage becomes small and the applied voltage to the light source lamp 5 becomes small.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exposure amount control device in an enlargement copying apparatus that enlarges and projects a microfilm image and transmits light onto a photoreceptor.

In an enlargement copying device that uses a scanning slit exposure method from microfilm, it is necessary to control the exposure μ to the photoreceptor depending on the density of the microfilm image and the contrast of the trench, etc. In a copying machine, there is no need to change the shape of the exposure aperture m or the exposure area, so the amount of light introduced to the photoreceptor can be changed by changing the aperture of the projection lens or by changing the voltage applied to the light source lamp. It was possible to adjust the change.

However, in copying equipment that has multiple enlargement magnifications, the illuminance and intensity distribution on the photoreceptor surface differ depending on the first magnification, and the density of the microfilm image differs. In the exposure adjustment method by changing the voltage applied to the light source lamp, it is possible to correct unevenness in the exposure dose distribution in the longitudinal direction of the exposure slit. As a result, the color temperature of the light source lamp changes greatly, and the exposure does not match the light intensity of the photoconductor, so it is necessary to adjust the exposure amount to make it suitable, or to change the voltage applied to the light source lamp. There were 113 cases where the voltage was so high that it shortened the life of the lamp.

For example, the enlarged copy magnification is 10, 14.5,
20 So, if the brightness of the projection lens for the Tani double beam (F number) is the same, then the projection illuminance ratio on the photosensitive surface for the same brightness of the C lamp is the same as the first one. Bo]:
0.7 = 0.5, so the opening of the exposure slit is the same for each magnification, that is, the exposure area on the photoreceptor is the same, and in order to apply the same amount of exposure on the photoreceptor, the expansion is 20x. At magnification 2, the brightness of the light source lamp needs to be twice as bright as at 10, so it is necessary to adjust the brightness of the light source lamp in response to changes in the density of the microfilm image. For example, this would be outside the dimming range of a normal light source lamp, which is very inconvenient.

The applicant has previously proposed a scanning slit M-light microfilm enlarged back copy mt=
In order to eliminate the drawbacks of the prior art as described above, the exposure area on the photoreceptor is automatically changed in accordance with each of a plurality of enlargement copying magnifications (1).

In addition, by automatically changing the position of the illumination device according to the different copying magnifications, and further changing the brightness of the projection lens corresponding to each enlargement copying magnification as necessary, it is possible to use the same light source lamp. We proposed a means to equalize the exposure layer to the photoreceptor at the magnification of ml with respect to the brightness. By kneading, the capacity can be increased by simply adjusting the brightness of the light source lamp in response to changes in the density of the microfilm.
I made it a point to give the K photoreceptor an appropriate R6 photometer.

A problem with this technique of adjusting the brightness of the light source lamp to optimize the exposure is the mismatch or discrepancy between the actual light size and the displayed light amount. Exposure display is 1 Tari Eichimi 1987-
It was disclosed in Publication No. 3834.8.
This is done using the scale provided on the operation panel of the M-shashin. By adjusting the knob i'A according to this scale, the rolling pressure of the h light lamp changes and the adjustment of the exposed layer is made. carry out. However, this kind of method
Due to variations in the shape of the filament of the light source, blackening of the lamp over time, deterioration of the filament, etc., the amount of no light changes, so it is likely that the actual B6 light penetration and the display scale will differ. .

Objective 1 of the present invention u5. An object of the present invention is to provide an exposure control device which can compensate for changes in the light area due to variations in light sources and can always obtain a non-light amount corresponding to an exposure control display area.

The exposure control device according to the present invention includes a means for controlling the voltage applied to the exposure light source, a means for displaying the exposed layer in accordance with the exposure light source voltage, and a Vc repair point relative to the exposure meter display. and means for shifting the light source voltage.

According to the present invention, by shifting the voltage applied to the light source, it is possible to correctly match the display value of the light quantity by shifting the voltage applied to the light source, which is different from the display value of the light quantity due to variations in the light source in front of the store. By giving the photoreceptor the appropriate amount of exposure, it is possible to always make good copies.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

Figure 111 is an external view of an embodiment of a microfilm enlargement printer to which the present invention is applied, and Figure 2 is an internal view of the sled.
) is a sectional view schematically showing the configuration, in which a microfilm image enlargement projection device 46 is placed above a copying device 47 using an electrophotographic copying method.

5- The magnifying projection device 46 is provided with a glass pressure bonding plate 93 made of a transparent glass plate to hold the microfilm pasted on the rectangular window of the aperture card 2. 93a, it is supported planarly in a vertical position, in the upward direction in Figures 1 and 2, that is, in the direction of the short side of the aperture card.

There is a carriage 111 that scans and moves across the light beam incident on the projection lens 8 from the illumination device fLe 4, and the microfilm image is enlarged and projected by the projection lens 8.
・Reflected by 1st mirror 20 and 2nd mirror 21,
The optical image formed on the photoreceptor drum 31 is
The microfilm is scanned and moved so as to move synchronously with the moving speed of 1.

The photosensitive drum 31 rotates in the direction of the arrow, and the charging device 32
The microfilm is uniformly charged and forms a latent image of the enlarged source on the microfilm at the exposure slit section 28.

The enlarged image developed by Sakaizo Somin 33 is fed by paper feeder f#4.
211'I:Yo') i43 for copying. 44. 45
(1) Copy paper 43a is fed to the home and cut into a predetermined length by cutter 50.

6- The photographic paper 43a transferred from the photoreceptor drum 31 by the transfer charging device 34 and separated from the photoreceptor drum 31 by the one-separation charging device 35 is transferred from the fixing device 38VC to the photoreceptor drum 31.
[! Llf* is fixed, and is discharged to a paper discharge tray 41 by a conveyor aligner 39 and a paper discharge roller 40.

On the other hand, the residue after transfer is W! Photoreceptor drum 3 with +-ner
1. For example, residual toner on the surface is removed by the cleaning device 36, and then by the static eliminator 37.

After the residual weight is removed, the charging device 32 again charges -, 1*
Once charged, the above-mentioned θ) operation is repeated. Copying operation by the photosensitive drum 31 and devices related to printing (
- Since the present invention is no different from that of conventional photographic apparatuses, a detailed explanation thereof will be omitted, and only the parts related to the present invention will be explained below.

As shown in FIG. 173, the aperture cards 2 in the hopper 82 are separated by the separation roller 85 and the detection roller 86. 102, i71 feeding roller 88.89
and the second feed roller 94,95.

The tip of the aperture card 2 or the positioning lever 98
The aperture card 2 is positioned at a predetermined position on the carriage 111 for exposure movement by having its rear end pressed against the stopper 92.

The carriage 111 moves in the short side direction of the aperture card 2, that is, in the direction perpendicular to the paper mi (not shown),
The aperture card 20 microfilm 61 is scanned and the light image illuminated by the nose light source 5 of the illumination device 4 is projected onto the photoreceptor drum 31 by the lens 8 at the projection position.
are sequentially projected on top. This Enokiyo machine has a magnification of 1 or 1.0.
A lens 9 for 14.5, a lens 8 for 14.5,
Three types of lenses of the lamp 10 for 20 are attached to the talent board 1], and by operating the enlargement copy magnification selection key on the operation pile, one of the lenses is set to the projection position V? -i+J moves and magnification selection cannot be performed.

The solitary projection device σ in this fire-shasai feature 01. The following is a kimono.

111, as stated in NiJ, the enlarged copying magnification in this embodiment &-L, 10x, 14.5x, 20X T&L, S F1. 't: h, 0-) Path light area on the photoreceptor drum 31 corresponding to the magnification (area from the exposure start point to the end point) - From X7 to X8t' in Figure 4.)
is outside the image capture area of the microfilm (the area outside a3 in Figure A.4)! The setting is made within a range that can prevent toner from adhering to the photoreceptor drum 31 due to sunlight.

1.2, the brightness (F value) of the fidget projection lens corresponding to each magnification is based on the conditions in 1.1 and the conditions 3 to 3 described later.
] - Under the conditions in item 7, the amount of exposure given to the photosensitive drum 31 is set to be equal for each magnification for the same brightness of the light source lamp 5.

1'3, the projected illuminance on the photoreceptor drum 31 decreases from the center toward the evening side in the direction of the rotation axis of the photoreceptor drum 31 according to the so-called 008 θ law.
The exposure area on the photoreceptor drum 31 is formed so as to vary its width from the center outward in the longitudinal direction in accordance with the illuminance distribution at each magnification, so as to obtain a uniform amount of light.

1' 4 K, slit blades 24 corresponding to respective enlargement magnifications of the slint control device 23 that regulates the recommended light area on the photoreceptor drum 31. 25. 26 is the irregular shape and dimension that regulates the projected light flux, and its projected light flux 9
- The narrower the exposure area that is regulated by kneading, the greater the accuracy required, so the above-mentioned 371 to 1.3 tombs are satisfied depending on each magnification ratio, and the below-mentioned 5 to 1.3 mounds are satisfied.
The exposure area is formed as wide as possible within a range that also satisfies item 7.

The moving speed of the surface of the photosensitive drum 310 rotating at a constant circumferential speed and the moving speed of the enlarged projected image of the microfilm due to the scanning movement of the carriage 111 are as follows.

The wider the exposure area, the more accurate matching is required, but the higher the degree of exposure, the more expensive the means for controlling the moving speed of the carriage 111 becomes.

The exposure area on the photoreceptor drum 31 is formed within a range in which an enlarged copy can be obtained without any practical problem even if a normal speed change control means is used to control the constant strain movement speed of the carriage 111.

At the enlarged copying magnification of 14.5x in this embodiment, the width of the copy paper is at most 594mm, and therefore the enlarged projected image corresponding to the kneading also has a width of 594mm, so the exposure area is also A body slit blade 25 whose longitudinal direction is 594+1111 is formed, and its length is approximately 500 mmVC. 500
Since it is extremely costly to maintain the awkward shape and dimensions that regulate the projection light beam over a length of mm and its position within the projection light beam with high precision, the exposure area at the magnification is・Widely formed within the range that satisfies item 5, 11
ing.

From the combination of the enlarged copying magnification in this embodiment and the maximum size corresponding to each magnification, the irradiation light from the illumination device 4 irradiates the film surface most effectively and corresponds to each magnification. The position of the illumination device 4 is lowered or lowered in accordance with each magnification so that the illumination device 4 is thrown into the projection lens most effectively.

In the persimmon example of the present invention, the position of the illumination device 4, the brightness of the projection lamps 8, 9, and 1.0, and the slits corresponding to the illuminance distribution are set so that the conditions of items A-1 to 177 above are satisfied. Blade 24. 25. By controlling the shape and position of 26 in accordance with each enlargement copying magnification, for the same brightness of the light source lamp 5, the exposure meter to the photoreceptor drum 31 at each enlargement projection magnification is controlled so that L < 7 As described in 91j, by simply adjusting the brightness of the light source lamp 5 in response to the density contrast of the microfilm, it is possible to easily adjust the photoreceptor drum 31Vc appropriately even at any magnification magnification. Furthermore, it is now possible to obtain uniform high-resolution enlarged copies.

As a specific embodiment according to the present invention, the photoreceptor drum 3
Up to 10m+ when magnifying magnification 10
t, maximum 20mm at 14.5 o'clock, 20
% and a maximum of 20 mm, and the brightness of each projection l/ance was set to F5.4. , 14.5 o'clock KF
6.1, at 20:00, press F4.

The illumination device 4 has a positional displacement of 15+ at 10x and 20x.
As 117W, it corresponds to the magnification of Sowasone.

In addition, in FIGS. 3 and 4, the light-shielding edge 29a of the upper slit plate 29 that forms the exposure area is formed in a straight line, and the blade 24. 25. The edges 24c, 25c, and 26c that regulate the projected light flux of 26 are used to correct the opening defects in the longitudinal direction σ) on the photoreceptor 31 at the same magnification, and to ensure uniform exposure of the photoreceptor drum. 314
It is formed by an image curve given by j. The blade 24°25 of the slit control device 23 corresponds to each enlargement copying magnification.
．． 26 is selectively displaced by a predetermined distance in conjunction with the activation signal of the projection magnification device.

Further, in the exposure slit section 28, a lower light shielding plate 30 is provided opposite to the upper slit plate and close to the photoreceptor drum 3'1K. The body drum 31 is configured in a manner similar to that shown in FIG.

Mitate Σshi This +JL copy has a blade, Figure 1 (as shown in C, the operation section (switches for the cape, knobs, and operation display shadows are 5'
The upper right of ik = the front of ls, the top right of the table, and the operation panel provided with the bamboo stone wall. Panel 530 consists of a lower operation panel 540, a table operation panel 560, and a right operation panel 570.

The middle operation panel 540K further includes, as shown in Figure 5,
Photosensitive drum 3 by enlarged projection from microfilm
The operating section and display section for adjusting the amount of exposure to 1 are self-adjusting.

The exposure adjustment distortion knob 547 lowers the voltage applied to the exposure light source lamp 513-, and by rotating clockwise, the voltage applied to the light intensity lamp 5 increases. Therefore, the density of the captured image increases. Rotation in the counterclockwise direction lowers the applied voltage and therefore lowers the image density.

The Shimako N display 546 is composed of three-digit display elements.

17+ numbers from 1.0 to 10.0 correspond to changes in the voltage applied to the light source lamp 5 from 8 volts to 24 volts. The standard density of the microfilm, that is, the appropriate exposure amount when enlarging and copying from a microfilm with a bank ground density of 1.0 is used as a standard.

At this time, the voltage applied to the light source lamp 5 is 14 volts, and the value of the light amount display 546 at this time is 4.5, and the display j/(corresponding light source lamp The voltage applied to 5 is almost linearly 12.5
It is controlled a+ to vary from volts to 15.5 volts. It is now swimming (see Figures 1 and 7).

This means that the applied voltage can be easily adjusted to 1A in response to slight changes in the density of microfilms that are normally used. , always proper exposure; 1゛ to photoreceptor drum 3
] It makes it easy to be strong.

Figures 3 and 6 are circuits that control the voltage σJ applied to the light source lamp 5 and the numerical value of the q-ray display 546.
1b, 631c interlocking triple σ) variable resistor 63
1 is directly connected. The variable resistor 631a has an inverse characteristic in which the resistance value decreases as the rotation shifts clockwise.
The J resistor 631b has a positive load whose resistance value increases when it is rotated one clockwise direction, and by combining the -fiJ resistors 631a and 631b, the exposure adjustment knob 547 can be turned clockwise. When you turn it, the resistance value decreases, so you can get drunk.

The lamp regulator 632 is a power source for applying voltage to the light source lamp 5, and returns the applied voltage to the lamp regulator 632 to increase the applied voltage.
Cape. When the feedback voltage to the lamp regulator 632 is small, the voltage applied to the light source lamp 5 becomes small, and when the feedback voltage is large, the voltage applied to the light source lamp 5 becomes large.

A feedback voltage to the lamp regulator 632 is supplied from the light source lamp 5 to variable resistors VR3, VH2, and 631a.

631b f through lamp regulator 632K
Since the amount of light supplied is Jl, turn the exposure adjustment knob 547 clockwise (a rotation increases the resistance value of the stiffness by 3", so the feedback voltage decreases /, f to the light source lamp 5). Apply voltage becomes smaller.

Furthermore, when the light source lamp 5 is rotated counterclockwise, the resistance value becomes smaller, so the feedback voltage becomes larger and the voltage applied to the light source lamp 5 becomes larger. Variable resistor VR3'tL.

This is an adjustment variable resistor that adjusts the feedback paper pressure to the lamp regulator 632 and sets the voltage applied to the light source lamp 5 to 24 volts when the exposure adjustment knob 547 is turned all the way clockwise. . The variable resistor VR4 adjusts the feedback voltage to the lamp regulator 632 to adjust the exposure amount,
When the distortion knob 547 is turned all the way counterclockwise, the voltage applied to the lamp 5 is set to 8 volts using a variable resistor.

The exposure amount display 546 is displayed by the panel meter 633.
VB2 by supplying voltage to panel meter 633 11.1.

The numbers change. The variable resistors i and j631c have a figurine 1<1: whose resistance value decreases when it is rotated clockwise for 1 hour. Variable resistor VRI is panel meter 633
When the exposure meter adjustment knob 547 is turned all the way clockwise, the voltage of 4' increases to 10 volts or 10. (This is a variable resistor for adjustment to make it positive.)

h] When the voltage supplied from the resistor VRZ &u' to the panel meter 633 is 1 volt, that is, the value 21. Use an adjustable variable resistor to set it to 0. Each time the knob 547 is turned, the resistance of the variable resistor JJC device 631c changes by one turn, so the voltage supplied to the panel meter 633 changes. Digital display of loquat Φ from 1.0 to 10.0 -=.

That is, since the variable resistors 631a, 631b, and 631c are interlocked with the light control pin 547, the value of the display 5716 and the voltage applied to the decorative lamp 5 are as follows.

It corresponds to t-6.

FIG. 177 is a graph showing the relationship between the numerical value of surface light -f1' voltage 546 and the voltage applied to the light source lamp 5 obtained by the lamp regulator 632. 12.5 by combining
volts to 15.5 volts t, the voltage applied to the light valve lamp 5 can be controlled approximately linearly.

The voltage applied to the light source lamp 5 is from 12.5 volts to 1
5.5 It is noted that the voltage is linearly increased by 1ffll at the voltage, and the value of the >K light display 546 at this time is from 3.0 to 6.0-. Since the display is 4, θ) applied voltage to the light source lamp 5 is 14 volts, 70) the gift of light i6, centering on the number 1 + & 4.5 of 546.
By rotating the light intensity adjustment knob 547, the value of the exposure size indicator 546 increases or decreases by 0.1, and the pressure at the mark 111 on the light source lamp 5 increases or decreases by 0.1 volts.
Because of this, it is usually shipped via microfilm.]
It is possible to easily make adjustments in response to changes in air temperature.

18- Also, if you want to change the range in which the value of exposure q("fG indication 546) and the range in which the voltage applied to the light source lamp 5 changes, that is, 1) If it is desired to change the relationship with the voltage applied to the light source lamp 5 that cannot be obtained by the lamp regulator 632, it can be easily changed by adjusting the variable resistors VR1, VH2, VH3, and VH2.

In Figures 1 and 8, the voltage applied to the light source lamp 5 was corrected by adjusting the resistors VR3 and VFt4.
5 is a graph showing the relationship between the numerical value of the photovoltaic indicator 546 and the voltage applied to the light source lamp 5. FIG. In this figure.

Line (b) is a reference curve, and is the same as in Figure 7. In addition, the line (,) indicates that when the exposure property is low due to variations in the light source lamp 5, the voltage applied to the light source lamp 5 is corrected by variable resistors VR3 and VR4, and the result (b) is shifted. be. Furthermore, due to the variation in the line (c) + IIM lamp, the exposure amount is changed, and the voltage applied to the light source lamp 5 is corrected by the variable resistors VR3 and VH2K, and m (b) is shifted. .

In this way, according to the exposure amount control device of the present embodiment, the exposure optical gap voltage value and the exposure amount display value corresponding to kneading change almost proportionally, so that even slight density changes such as the microfilm 171c are removed. Even though.

Following this first step, it is possible to perform fine adjustment distortion of the exposure amount,
Further, the exposure amount to be corrected can be easily adjusted without looking at the 'jπ light speed reading value.

Furthermore, even if there are variations in the light source, the exposure amount is always displayed [because the directly corresponding exposure amount can be applied to the photoreceptor, it is not always possible to obtain clear and good copies.

[Brief explanation of drawings]

1 is an external view showing an example of an enlarged copying apparatus to which the exposure amount control device 1 of the present invention is applied. Figures 1 and 2 are schematic diagrams showing the internal configuration of the tilting device shown in Figure 1. Figure 3 is a schematic diagram of the copying machine shown in Figure 2. FIG. A.4 is an explanatory diagram of the operation of the projection device in the copying apparatus shown in FIG. 2. Figure 1'5 is a partial plan view of the operation panel of the stilling device shown in Figures 3 and 1. 3 and 6 are circuit diagrams of the exposure amount control device ff1jK of the present invention. Figures 7 and 8 are graphs showing the relationship between the voltage applied to the light source lamp and the multiple light amount display in the exposure amount control device of the present invention. 2...Aperture card, 5...Exposure light source, 8°9.10...Enlargement 1.' lenses %31...Photosensitive drum%61...Micro film, 546...Repair information Display, 547...Exposure adjustment knob 1 - □ Exposure display procedure amendment (voluntary) February 2, 1980 1 Incident display 1981 Patent application No. 206528 2 Name of the invention Exposure control device 3 Relationship with the case of the person making the amendment Patent applicant Location 1-3-6 Nakamagome, Ota-ku, Tokyo Name (6)
74) Riko Co., Ltd. -4 Agent 156 Address 2-6-28 Sakuragaoka, Setagaya-ku, Tokyo Telephone 03 (428) 5106 6. Contents of the amendment (11 Specification 1, page 6, line 4, “Support ” should be corrected to “clip”. (2) “1 te” at the beginning of line 15 on page 6 should be corrected to “put”. "Exposure light source" is corrected to "light source lamp." (4) "Photoreceptor" in line 18 of page 12 is corrected to "photoreceptor drum." (5) At the beginning of line 16 of page 13 of the same Correct “middle” to “lower”. (61, page 14, line 15, “3 to 6” is changed to “6.0
From 6. OJK correct. σ) Change “To 632” to “632” on page 15, line 18 of the same page.
Correct to "Tono". (8) Correct "small" at the end of line 19 on page 15 to "thick". (Correct ``large'' in the first line of page 16 of the same edition to ``smaller.'' Correct "smaller" in line 8 of page 16 to "larger." 0z "1 smaller" in line 9 of page 16 to "larger."
Correct to. OJ Correct "large" to "small" in line 11 of page 16 of the same. Q41 "Negative characteristic of becoming smaller" in the 4th line of page 17
is corrected to "positive characteristic of becoming thicker." 151 In the same page, page 21, line 6, "exposure light source" is corrected to "light source lamp." 5-

Claims (1)

[Scope of Claim] An enlargement copying apparatus that enlarges and projects a microfilm image to expose a photoreceptor, comprising means for controlling a voltage applied to an exposure light source. and means for displaying the exposure amount in response to the exposure light source voltage. An exposure amount control device having means for shifting the exposure light source voltage relative to the exposure ambiguity display.