JPH0457012A - Switching device for color separation optical member - Google Patents

Abstract

PURPOSE:To exactly position of the switching position of a color separation optical member, and to stably calculate the position by positioning the calculated color separation optical member in an optical path by a click stop mechanism. CONSTITUTION:When a document 2 is subjected to read scan by a light source 3, its read light is allowed to pass through mirrors 4, 5 and 6, and an exposure lens 7 and irradiates a red filter 10R. In the filter 10R, only light of a red wavelength band is allowed to pass through, and this passing light is allowed to form an image on the surface of a charged photosensitive drum 9 by a reflecting mirror 8. Accordingly, when the drum 9 is rotated by synchronizing with a read scan of the document 2, the drum 9 is exposed by a red light. Subsequently, the exposed drum 9 is developed by a cyan toner. In such a way, a calculated color separation filter is positioned by click stoppers 22a, 22b in an optical path by a driving motor 18. The color separation filter can be positioned exactly in the optical path without being influenced by inertial force of the motor 18 and the unit 10, and also, the position can be calculated stably.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a switching device for color separation optical members applied to color copying machines, color facsimile machines, and the like.

(Prior Art) For example, in a color copying machine that uses electrophotography to form color hard copies, color separation filters such as red, green, and blue are installed in the optical path that guides the original reading light to the photosensitive drum. can be selectively switched.

Then, one of each color separation filter is positioned in the optical path,
The charged photosensitive drum is exposed to light passing through this color separation filter, developed with toner that has a complementary color relationship with the filter, and then the toner image is transferred and fixed onto recording paper, and the filter is switched in the same way. By repeating the steps of charging, exposing, developing, transferring, and fixing each time, a color print corresponding to the original is reproduced.

Conventionally, in such a color copying machine, a switching device for selectively positioning each color separation filter in the optical path has been used to arrange various color separation filters radially around a rotation axis. A drive motor is connected and the drive motor is controlled by a control circuit to index and position the color separation filter on the optical path.

(Problem to be Solved by the Invention) However, in the conventional color separation filter switching method as described above, the driving morph is controlled in an oven loop or a closed loop based on a command signal from a control circuit. Since the position of the color separation filter is determined by rotating the angle, the stop position of the color separation filter changes slightly due to the inertia of the color separation filter and the drive motor during the index rotation, which may cause the previous radiation on the color separation filter to change slightly. There was a problem that the corners could not be set accurately.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a switching device for a color separation optical member such as a color separation filter that can set the switching position of a color separation optical member with respect to an optical path with high precision. shall be.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a plurality of color separation optical members that separate optical information from a document etc. into different colors, and a plurality of color separation optical members that a support mechanism that indexes and rotatably supports each of the color separation optical members in the optical path system; a drive unit that indexes and rotates each of the color separation optical members in the optical path system; and a support mechanism that indexes and rotates the color separation optical members in the optical path system; It is characterized by being equipped with a click stop mechanism for positioning inside.

(Function) When the color separation optical member is indexed into the optical path by the driving means, the color separation optical member is mechanically positioned by the click stop mechanism.

Therefore, the switching position of the color separation optical member becomes accurate,
Stable position determination becomes possible.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a cross-sectional view showing the overall configuration, and FIG. 2 is a view taken along line A-A in FIG. 1. 3 is a sectional view showing details of the positioning section, and FIG. 4 is a schematic configuration diagram of a color copying machine to which this embodiment is applied.

First, in FIG. 4, ■ is a glass plate on which the color original 2 is set, 3 is a reading light source such as a halogen lamp arranged on the bottom side of the glass plate l, and 4 is the irradiation of the light source 3 onto the original 2. This is a reading mirror disposed opposite to the position of the mirror 4, and in the reflection direction of this mirror 4, a reflecting mirror 5 that redirects the reading light downward is installed.

Further, in the reflection direction of the reflection mirror 5, a reflection mirror 6 is installed to change the direction of the reflected light to the horizontal direction.

An exposure lens 7 is arranged on the reflection optical path of the reflection mirror 6, and a reflection mirror 8 on the optical axis on the downstream side of the exposure lens 7 is arranged to reverse the light passing through the exposure lens 7 diagonally downward. is installed.

Further, in the direction of reflection of the reflection mirror 8, a photosensitive drum 9 is arranged which rotates in synchronization with the reading and scanning of the original 2 by the light source 3.

IO is original 2 or 62 or more primary colors 1, for example red.

This is a color separation unit for creating images representing the brightness and darkness of green, blue, or monochrome, and is arranged on the light exit side of the exposure lens 7.

The color separation unit 10 also includes a red filter IOR that passes light in the red wavelength band, a green filter 10G that passes light in the green wavelength band, a blue filter 10B that passes light in the blue wavelength band, and a monochrome filter IOM that passes all visible light. As shown in FIGS. 1 and 2, these filters 1OR-10M are arranged radially at equal intervals around a rotating shaft 12 that supports the whole, and each end is connected to the rotating shaft 12.
It is attached between support plates 13a and 13b which are fixed on both sides.

Both ends of the rotating shaft 12 are rotatably supported by bearings 16a, 16b between a pair of brackets 15a, 15b fixed to the copying machine body frame 14.

Further, a driven gear 17 is fixed to one end of the rotating shaft 12,
This driven gear 17 is meshed with a drive gear 19 fixed to a rotating shaft 18a of a drive motor 18 such as a stepping motor.

The drive motor 18 is fixed to the copying machine body frame 14 by a bracket 20.

As shown in FIG. 2, each color separation filter l0R1, 0G, IOB
, positioning holes 21R, 2 at locations corresponding to the ends of the IOM.
1G, 21B, and 21M are formed.

Furthermore, click stoppers 22a and 22b are attached to the brackets 15a and 15b to be engaged with the positioning holes 21R to 21M of the corresponding support frames 13a and 13b.

The click stoppers 22a, 22b consist of a cylindrical member 23 whose one end is fixed to the bracket 15a (15b), a locking member 24 slidably fitted into the cylindrical member 23, and a locking member 24, as shown in FIG. It is composed of a coil spring 25 that biases the locking member 24 in the projecting direction, and the protruding tip of the locking member 24 elastically engages with the positioning holes 2]R to 21M of the filter support plate 13a (13b), respectively. It is formed like this.

A protrusion 26 is formed on the outer periphery of the disk 13a to set the rotational reference point of the color separation unit 10.
A photo sensor 27 is arranged on the outer periphery of the photo sensor 27, which sends out a signal every time the protrusion 26 passes. The output signal of the photosensor 27 is input to the control circuit 28 of the drive motor 18.

The control circuit 28 controls each color separation filter IOR based on the signal from the photo sensor 27.

The drive motor 18 is controlled so that the 10G, IOB, and IOM are indexed and rotated to predetermined angular positions.

Next, the operation will be explained.

When copying the original 2 in color, the control circuit 28 operates,
When a command signal is supplied to the drive motor 18, the drive motor 18 rotates by the number of revolutions corresponding to the command signal, and transmits the rotation to the rotating shaft 12 through the gears 19, 17.

As a result, the color separation unit IO is rotated by an angle corresponding to the command signal, and one of the filters, for example, the red filter IOR, is indexed into the light path on the output side of the exposure lens 7.

At the same time, the positioning holes 21R of the support plates 13a and 13b are
The corresponding click stoppers 22a and 22b
It engages with the locking member 24 of.

As a result, the OR is the exposure lens 7.
accurately positioned in the optical path of the

When the original 2 is read and scanned by the light source 3 in this state, the reading light passes through the mirrors 4, 5.6 and the exposure lens 7 and is irradiated onto the red filter IOH.

The red filter IOR allows only light in the red wavelength band to pass through due to its spectroscopic action, and the reflected mirror 8 forms an image of this passing light on the surface of the charged photosensitive drum 9 .

Therefore, if the photosensitive drum 9 is rotated in synchronization with the reading and scanning of the original 2, the photosensitive drum 9 will be exposed to red light. The exposed photosensitive drum 9 is then developed with a well-known cyan toner, and this cyan toner image is further transferred and fixed onto recording paper by a well-known means.

Thereafter, in the same manner, the drive motor 18 is controlled by the control circuit 28 according to the order of color printing, one of the color separation filters is indexed and positioned in the optical path, and each selected color separation filter is charged, exposed, and By repeating the steps of development, transfer, and fixing, a color print identical to the original 2 can be obtained.

In this embodiment, since the color separation filters determined in the optical path by the drive motor 18 are positioned by the click stops 22a and 22b, the drive motor 18 and the color separation unit 10 are The color separation filter can be accurately positioned in the optical path without being affected by inertial force, and stable positioning is also possible.

Furthermore, the drive motor 18 can be easily controlled by the control circuit 28.

In the above embodiment, the switching method of the present invention is applied to a color separation filter of a color copying machine.
Not limited to this, facsimile.

It can also be used for laser printers, etc.

Furthermore, the color separation optical member is not limited to one having a structure that allows wavelength bands such as red, green, and blue to pass through, but may also be a dichroic mirror that reflects light in a specific wavelength band.

(Effects of the Invention) As explained above, according to the present invention, since the optical member for color separation is positioned in the optical path by a click stop mechanism, the switching position of the optical member for color separation is accurate. , allowing stable positioning.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
3 is a sectional view of the click stop mechanism in this embodiment, and FIG. 4 is a schematic diagram of a color copying machine to which the switching system of the present invention is applied. In the figure, 2 is a document, 3 is a light source, 7 is an exposure lens, 9 is a photosensitive drum, 10 is a color separation unit, 10R, IOG,
IOB and IOM are color separation filters, 12 is a rotation axis, 1
3a and 13b are filter support plates, 15a and 15b are brackets, 18 is a drive motor, 21R, 21G, 21B,
21M is a positioning hole, 22a and 22b are click stoppers, 27 is a photosensor, and 28 is a control circuit.

Claims (1)

[Scope of Claims] A plurality of color separation optical members that separate optical information from a document or the like into different colors, and a support that indexes and rotatably supports each of the color separation optical members in an optical path system for the optical information. a mechanism, a drive means for indexing and rotating each of the color separation optical members in the optical path system, and a click stop mechanism for positioning the color separation optical members indexed by the drive means in the optical path system. A switching device for optical members for color separation, characterized by: