JPS5916264B2 - Exposure adjustment device for electrostatographic copying machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatographic copying machine, and more particularly to an exposure amount adjustment device in an electrostatographic copying machine that repeats charging, exposure, and development steps multiple times to obtain a color copy image. .

In conventionally known color electrophotographic copying machines, a charged electrostatic photosensitive layer is imagewise exposed using light color-separated by red, green, blue, etc. filters to form an electrostatic latent image. , the electrostatic latent image on the photosensitive layer is developed with a developing toner corresponding to the color-separated light, and the charging process, image exposure process, and development process are repeated for the three primary colors on the same photosensitive layer. It consists of things.

However, according to this color electrophotographic copying machine, the light rays separated into colors by the filler nosing differ in the amount of exposure of each color when exposed under the same conditions due to the energy distribution of each color component of the light source and the difference in transmittance of each filler no. Such a large difference occurs that it is impossible to reproduce a color copy image that is faithful to the original. Moreover, since even a slight change in the exposure amount causes a significant change in the copied image, skill is required for the operation. An object of the present invention is to automatically adjust and determine the appropriate exposure amount corresponding to the color-separated light rays in conjunction with the selection of the color-separated light rays with a simple configuration, and thereby perform the exposure adjustment operation. An object of the present invention is to provide an exposure amount adjustment device for an electrostatographic copying machine, which can simplify the process and obtain a color copy image that is faithful to the original.

According to the present invention, in an electrostatographic copying machine having a light source for exposing an original and a color separation mechanism for exposing a photosensitive layer with color-separated light, the light source for exposing an original has color-separated light for each color-separated light. The exposure amount adjustment circuit is connected to a power source through an exposure amount adjustment circuit that adjusts the amount of exposure to the photosensitive layer to an appropriate exposure amount in accordance with the color separation optical mechanism. There is provided an exposure amount adjustment device for an electrostatographic copying machine, characterized by comprising a phase control circuit for controlling the exposure amount. Hereinafter, the present invention will be explained based on embodiments shown in the accompanying drawings.

In order to expose the photosensitive layer of the copy paper with the color-separated light, a support frame is arranged to cross the optical path c passing through the lens 23 fixed to the body 1, as shown in FIGS. 1 and 2, for example. A color separation mechanism 24 is provided, which includes a member 25 and a plurality of types of color separation filters 26a, 26b, and 26c attached to the support frame member, and which causes displacement of the support frame member 25 to produce a color on the optical path c. A color separation pool selection mechanism 27 (see FIG. 8) is provided for selecting a color separation pool to be positioned.

The support frame member 25 has a disk or umbrella shape, and a plurality of openings (four in the figure) are provided around the disk or umbrella. Color pool Shioichi, ie, blue filter 26a, green filter 26b
1 red filter 26c is provided.

One of the openings 29d is in a pool-less state to transmit white light. In the case of the support frame member 25, as shown in FIG.
26b, 26c and the filterless aperture 29d as optical path C.
pins 33a, 3 corresponding to the color separation film nozzle and the filmless opening,
3b, 33c, and 33d are fixed on the surface of the support frame member 25 at different distances from the rotating shaft 32, and
Switches Sa, Sb, Sc,
Provide Sd.

As shown in FIG.
The terminals a of b', S♂, and Sd' are connected to the = terminal of the power source E, and the normally open contacts b of the switches Sa', Sb', Sc', and Sd' are connected to the terminals a of the switches Sa, Sb, and Sc. , Sd are connected to respective terminals a. In addition, the switch Sa
, Sb, Sc, and Sd are connected to one end of a motor 1M, and the other end of the motor 1M is connected to the other end of a power source E. Thus, when the camera 80 (see FIG. 8) of the filter selection mechanism 27 is rotated to a predetermined designated position and the switch Sx'(x'=a',b',c',d') is pressed, The normally open contact b of the switch Sx' becomes a contact, and the switch Sx (x=A
, b, c, d), the motor M starts rotating, and the rotation of the motor M rotates the support frame member 25, and the pin 3
3x (x=A, b, c, d) comes into contact with the switch Sx, the normally closed contact c of the switch Sx is disconnected, cutting off the current to the motor-M. As a result, the mirror M stops rotating, and the color separation filter or pool filter aperture corresponding to the pin 33x is selectively positioned on the optical path c. Instead of using the support frame member 25 consisting of a rotatable disk or umbrella as described above, a plurality of color separation pools 26a, 26b are installed in a straight line as shown in FIG.
, 26e, and a pool slide opening 29d are slidably supported by rails 30, 307, and a wire 31 fixed to the center of both ends of the support frame member 25 and the pool slide It is also possible to connect one selection mechanism 27 and rotate the filter selection mechanism 27 to slide the support frame member 25 and position a desired color separation filter or filterless aperture on the optical path c. good.

In this case, as shown in FIG. 5, pins 34a and 34 are attached to both ends of the support frame member 25 in order to switch between normal and reverse rotation of the motor M that reciprocates the support frame member 25 left and right.
b is fixed, and switches Se and Se' are provided at related positions pressed by the respective pins 34a and 34b.

The wire 31 of the support frame member 25 is connected to a pulley 36 that is rotatably attached to a rotating shaft 32 of the mono M through pulleys 35' that are rotatably attached to a plurality of shafts 35. By switching the switches Se and Se', the motor M is rotated in forward and reverse directions to reciprocate the support frame member 25 from side to side. Further, the support frame member 25 is provided with pins 3 at different distances from the upper end of the support frame member 25.
3a, 33b, 33c, and 33d are fixed, and switches Sa, Sb, Se, and Sd are provided at related positions pressed by the respective pins 33a, 33b, 33c, and 33d. As shown in FIG.
a/, Sb', Sc', Sd' and the switch Se,
Connect terminal a of Se' to one end of power supply E, and switch S
Connect the normally open contacts b of each of a', Sb', Sc', and Sd' to the terminal a of each of the switches Sa, Sb, Sc, and Sd, and connect the normally open contacts b of each of the switches Se and Se'. and one end of self-holding relay R1. In addition, the normally closed contacts c of the switches Sa, Sb, Sc, and Sd are connected to the terminal a of the relay R1-1, and the contact C of the relay contact R1-1 is connected to the normal rotation (clockwise rotation) terminal of the motor M, and the contact b are connected to the reverse rotation (left rotation) terminal of motor M, respectively. In addition, a starting capacitor c of Mono-M is connected between the forward and reverse rotation terminals. In this way, the filler selector mechanism 27 (see FIG. 8) is rotated to a predetermined designated position to switch Sx'(x'-a',b',c',d').
When the switch Sx' is pressed, the normally open contact b of the switch Sx' is connected, and the switch Sx(x
= A, b, c, d) to rotate the motor M.

At this time, since the switch Se' is pressed by the pin 34b of the support frame member 25, the motor M is rotated forward through the contact c of the relay contact R1-1. As a result, the support frame member 25 starts moving rightward. Note that the pressure on the switch Se' is released by the rightward movement of the support frame member 25, but the switch Se' is self-held by the relay R1. The support frame member 25 continues to move rightward, and the pins 33x (x=A, b, c, d) are connected to the switch S.
When it comes into contact with x, the normally closed contact C of the switch Sx is disconnected, cutting off the power supply to the switch Sx. As a result motor M
stops rotating, and selectively positions the color separation filter or fillless aperture corresponding to the pin 33x on the optical path e. Furthermore, the filter selection mechanism 2
When the camera 80 of No. 7 is rotated to a new designated position, the same operation as described above is performed, and when the support frame member 25 completes its rightward movement, the switch Se is pressed by the pin 34a and the relay contact R1- The contact point c of 1 is disconnected and the contact point b is connected.The remote controller 1M is rotated in the opposite direction, and the support frame member 25 is moved to the left to bring the pin 33x into contact with the switch Sx, and the newly selected color separation is performed. A filter opening or a pool opening can be located on the optical path c. An important feature of the present invention is that a light source for exposing an original is connected to a power source via an exposure amount adjustment circuit that adjusts the amount of exposure to the photosensitive layer to an appropriate amount of light in accordance with each color-separated light; The amount adjustment circuit is constituted by a phase control circuit that controls a gate signal in conjunction with the selection mechanism 27 of the color separation mechanism 24.

For this purpose, in FIG. 7, ten groups of fixed resistors Rl, R2, R3, R4 and a variable resistor V
R are connected in series to form a lighting circuit for the light source 19 for exposing the original.

One end of each fixed resistor is connected to the color separation filter selection mechanism 27.
The other end of the fixed resistor is connected to one variable resistor R to enable fine adjustment by the sum of the fixed resistance value. connected in series. The number of contacts of the changeover switch S7B is equal to the total number of color separation filters and filterless openings (four in Fig. 1), and the resistance value of each fixed resistor depends on the presence or absence of a filter, the transmittance of each filter, or copying. It is set so that an appropriate light power can be obtained according to the spectral sensitivity of the paper photosensitive layer. Thus, as described above, when a desired pool filter or filterless opening is selected by the color separation filter selection mechanism 27, the fixed resistance is switched by the switch S7B in conjunction with the selection mechanism 27.

By switching this fixed resistor, the phase of the lamp light power of the document exposure light source 19 is controlled by changing the gate signal. Therefore, for a certain copying document, if the lamp light power of the document exposure light source 19 is adjusted to a desired level using the variable resistor VR, the appropriate light power can always be obtained regardless of the type of light image. become. The color separation filter selection mechanism 2
7, for example, as shown in FIG. 8, a camera 80 is attached to an end of a shaft 43 on the outside of a cover 84 so as to be operable from outside the body, and the shaft 43 has a convex portion at its tip. 109
A rotary arm 110 having a rotary arm 110 is pivoted, and the convex portion 109 is provided in a positional relationship such that it can press the aforementioned switches Sa', Sb', Sc' and Sd'.

Further, a gear 111 is mounted on the shaft 43 and engaged with a gear 112 that is mounted on the rotating shaft of a changeover switch S7B for selecting an appropriate exposure amount. Said switch S7
B and switches Sa', Sb', Sc', and Sd' are held by a support plate 114 fixed to the body frame 83 by a plurality of shafts 113. Although not shown in the drawings, the camera 80 is provided with an instruction symbol, and the camera 80 is provided with an instruction symbol.
Symbols or letters indicating the developing colors of yellow, red, blue, and black are provided on the cover 84 around the 0 or on a separately provided panel board.

Thus, when the camera 80 is rotated and the instruction symbol of the camera 80 is aligned with the desired development color symbol, the switch Sx' is activated via the shaft 43 and the rotating arm 110 in correspondence with the development color symbol.
(By selectively pressing any one of x'=a', b', c', and d, the color separation filter 26a of the support frame member 25 is
, 26b, 26c, or the fillless opening 29d, the gear 111 attached to the shaft 43 is selected.
and the switch S7 via the gear 112 engaged therewith.
By switching the contact B, it is possible to adjust and set the appropriate exposure amount corresponding to each color-separated light as described above.

According to the present invention, the above-described simple configuration automatically adjusts and sets the appropriate exposure amount corresponding to each color-separated light in conjunction with the selection of the color separation mechanism, thereby significantly simplifying the exposure amount adjustment operation. At the same time, it is possible to obtain a color copy image that is faithful to the original.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a color separation mechanism applied to the present invention, FIG. 2 is an explanatory diagram of the arrangement of a switch mechanism for selecting a color separation filter in the color separation mechanism of FIG. The figure is an electrical wiring diagram of the switch mechanism in Figure 2, Figure 4 is a front view showing another example of the color separation mechanism, and Figure 5 is the switch mechanism for selecting the color separation filter of the color separation mechanism in Figure 4. 6 is an electrical wiring diagram of the switch mechanism shown in FIG. 5, FIG. 7 is a circuit diagram for adjusting the exposure amount in the present invention, and FIG. 8 is a diagram for linking the selection of the color separation mechanism and the adjustment of the exposure amount. FIG. 19 is a light source for exposing the original, 24 is a color separation mechanism, 26a, 2
6b and 26c represent color separation filters, and 27 represents a color separation filter selection mechanism, respectively.

Claims (1)

[Claims] 1. In an electrostatographic copying machine having an original exposure light source and a color separation mechanism for exposing a photosensitive layer with color-separated light, the original exposure light source exposes a photosensitive layer to each color-separated light. The exposure amount adjustment circuit is connected to a power source through an exposure amount adjustment circuit that adjusts the exposure amount to an appropriate exposure amount, and the exposure amount adjustment circuit includes a phase control circuit that controls a gate signal in conjunction with a selection mechanism of the color separation mechanism. An exposure amount adjustment device for an electrostatographic copying machine, characterized in that: