JPS6396687A - Illumiance measuring instrument for light source of copying machine - Google Patents

Abstract

PURPOSE:To measure the illuminance distributions of an exposure lamp and a destaticizing lamp in a short time by moving a slider in parallel to the axis of a light source and placing an illuminance measuring element in oscillating operation in the direction of the exposure lamp and the direction of the destaticizing lamp. CONSTITUTION:An illuminance distribution measuring instrument main body 1 is mounted detachably at a prescribed position in a copying machine main body. While the illuminance measuring element 4 of the main body 1 faces in the direction of the axis of the exposure lamp and measure its illuminance distribution, the slider 2 moves to the side of a frame 14 and then a pin provided to an element fixed table 3 contacts the upper end surface of a cylinder cam 20b and slides along the upper end slanting surface of the cam 20b, so that a table 3 rotates around a rotating shaft 6. The element 4 is rotated up to a prescribed angle when the slider 2 contacts stoppers 21a and 21b, and the element 4 is directed to the destaticizing lamp by this oscillating operation. Consequently, an operator can confirm the illuminance values of the exposing and destaticizing lamps on a display device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a light source illuminance measuring device that can measure the illuminance distribution in the axial direction of an exposure lamp that irradiates a photosensitive drum of a copying machine and a static elimination lamp with one device. It is related to.

Prior Art FIG. 6 is a schematic view of a main part mainly showing the vicinity of the lens array 29 in a general copying machine 23 of a fixed light source (original table moving) type using a lens array 29 such as a SELFOC lens.

In such a copying machine 23, the light amount emitted from the exposure lamp 24 is adjusted by the light spreader plate 26, and the light amount is adjusted by the reflector 27.
The reflected light is focused on the upper surface of the document table glass 28.

The collected light is reflected by the original placed on the upper surface of the original platen glass 28, passes through the lens array 29, and is irradiated onto the photosensitive drum 30.

In such a copying machine, for example, the photosensitive drum 3
If there are irregularities in the illuminance distribution in the longitudinal direction of the exposure lamp 240, which is irradiated at zero, a copied image with low density will be obtained in areas where the exposure illuminance is high, and a copied image with high density will be obtained in areas with low exposure illuminance. , which causes density unevenness in copied images.

Further, the static elimination lamp 25 eliminates the electric potential charged on the photosensitive drum 30 by the charger 331 after the transfer is completed by the transfer charger 33, but due to the unevenness of the illuminance distribution of the static elimination lamp 25, static elimination spots may occur. Similar to the irregularities in the illuminance distribution of the exposure lamp 24, this affects the copied image.

Therefore, it is necessary to accurately and precisely measure the illuminance distribution of the exposure lamp 24 and the static elimination lamp 25 on the product assembly line.

Problems with the Prior Art Therefore, in the past, the illuminance distribution was measured by visually inspecting the copied image obtained by copying from a predetermined test pattern original using a copying machine assembled on a production line. However, there are individual differences in this visual inspection.
In addition to being affected by worker fatigue, inspection time, lighting, etc., it is also impossible to separate the charging section, developing section, transfer section, and spots caused by the light source from the developing section caused by other copying processes. It was not possible to make accurate measurements.

Purpose of the Invention Therefore, the object of the present invention is not based on visual observation, that is,
In order to prevent individual differences, the charged part should also be adjusted.

To be able to accurately measure the illuminance distribution of a light source by separating the influence of the developing part, the transfer part, etc. and displaying only the illuminance unevenness of the light source, for example, in a digital quantity, and to simplify such a measuring device. The goal is to provide highly efficient equipment.

Structure of the Invention The main means adopted by the present invention to achieve the above object are as follows: a measuring device main body that can be freely attached to and removed from a predetermined position within the main body of a copying machine; a slider that is attached to the slider and can be swiveled in the direction of the exposure lamp and the direction of the static elimination lamp when the measuring device main body is attached to the copying machine main body. This is a light source illuminance measuring device for a copying machine, comprising an illuminance measuring element and a display means for calculating and displaying a signal from the illuminance measuring element.

The i1+1 fixed press main body can be fixed at a predetermined position within the main body of the copying machine, for example, by being inserted into a bearing portion for mounting a photosensitive drum of a copying machine.

Further, as the illuminance measuring element, it is desirable to use an element whose output signal changes depending on the amount of light, such as a CDS meter.

Furthermore, the display means can convert the signal from the illuminance measurement element into a digital quantity and display it, or can display the illuminance in the form of a bar graph or the like, and can also display the illuminance distribution in correspondence with the moving position of the slider. Alternatively, it may be printed out.

How the Invention Works First, an operator places the illuminance distribution measuring device main body at, for example, a photosensitive drum center position within the copying machine main body. After that, while displaying the signal from the illuminance measuring element on the display means, slide the slider in the axial direction of the light source to measure the illuminance of the exposure lamp or static elimination lamp. Shake the head in the direction of the static elimination lamp, slide the slider again from one end of the light source to the other, and measure the illuminance distribution on the static elimination lamp side.

Practical Aspects Next, embodiments embodying the present invention will be described with reference to the attached FIGS. 1 to 5 to provide an understanding of the present invention.

Here, FIG. 4 is a perspective view of the entire illuminance measuring device 5 according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the mounting structure of the slider and illuminance measuring element used in the illuminance measuring device, and FIG. is a front view of the illuminance measuring device shown in Fig. 1, and Fig. 4 is a front view of the illumination measurement device shown in Fig. 3.
5 is a perspective view showing the illuminance measuring device shown in FIG. 1 being installed in the main body of the copying machine.

Note that the present invention is applicable not only to a copying machine equipped with a lens array as shown in FIG. 6, but also to any type of copying machine with a moving optical system, a moving original f/head type, or a moving original type. Needless to say.

It should be noted that the following example is only one specific example of the present invention, and is not intended to limit the technical scope of the present invention.

In this embodiment, as shown in FIG. 5, the illuminance distribution measuring device 1 is attached to a predetermined position of a partially assembled copying machine 23 (to which at least an exposure lamp and a static elimination lamp are attached), and this illuminance distribution measurement is carried out. The illuminance measuring element 4 provided on the device main body 1 is slid in the axial direction of the light sources to detect the light from each light source and measure the illuminance distribution.

The illuminance distribution measuring device main body 1 as described above is shown in FIGS. 1 to 4.
The element fixing table 3 for fixing the illuminance measuring element 4 has a bearing 7° at the end and a spacer 8, which is shown in detail in the figure.
It is rotatably attached to the slider 2 via a rotating shaft 6, and the center of rotation is set to coincide with the center position of the photosensitive drum.

The slider 2 has a positioning hole 21.2+.

is provided, and the element fixing table 3 is positioned in a predetermined direction by the lock pin 9 attached to the element fixing table 3 and the positioning holes 2°, 2.

The lock pin 9 includes a ball 9 that protrudes toward the tip of the lock pin 9. A compression spring (not shown) that presses this ball 9□ and a screw for adjusting the pressing force of this compression spring are incorporated, and when the element fixing table 3 is rotated to a predetermined angle, the ball 9 is positioned. Hole 2 or 2I,
By fitting into the slider 2, the element fixing table 3 is fixed to the slider 2 with an appropriate force.

12 is a screw for adjusting the protrusion 1XRa of the lock bin 9.

The illuminance measuring element 4 is fixed to the element fixing table 3 with an element fixing screw 11, and is connected to an illuminance measuring amplifier (not shown) via a signal line 19. Further, the distance from the center of rotation of the tip of the illuminance measuring element 4 to the element is set so as to coincide with the surface position of the photosensitive drum 30.

At the upper end of the element fixing table 3, a pin 10. and 10 protrude, and this pin 10
a, 101. For example, at the sliding end of the illuminance measuring element 4, with a contact pin for switching the illuminance measuring element 4 to a predetermined direction,
Frames 13 and 14 of the illuminance distribution measuring device main body l to be described later
A cylindrical cam attached to 20. ．． 20+, to perform neck photography of the illuminance measuring element 4.

Left and right frames 13 and 1 of the illuminance distribution measuring device main body 1
4 are guide plates 16, 17 . Slide shaft 15-. 15h
The slider 2 is integrally fixed by
Said slide shaft 15. ．． 15h, it is possible to perform a reciprocating sliding motion in the axial direction of the light source via the slide bearings 5a, 51+.

When the slider 2 is to be reciprocated manually, the operator pushes or pulls the operating rod 18 that protrudes from the slider 2 through the frame 13. In addition, when the slider 2 is to be slid automatically, a threaded rod that is threaded onto the slider 2 is provided parallel to the slide shafts 151 and 15b, and this threaded rod is rotated by a motor not shown to cause the slider to slide. Can be done. In this case, depending on the rotation angle of the motor (or the number of pulses if the motor is a pulse motor), the illuminance measurement element 4
By simultaneously taking in and displaying this position signal and the signal from the illuminance measuring element 4, the illuminance distribution can be obtained.

Said slide shaft]5. ．． 15+, stoppers 21a, 21h, which abut the slider 2 and stop it.
22a and 22h are attached to position the slider 2 at its moving end and to prevent iE strikes.

Also, inside the frames 13 and 14, there are pins 10. and 10 cylindrical cams 20 and 20 that interfere with each other.
is installed. 13a.

13b, 14□, 145 are the illuminance distribution measuring device main body 1
This is a positioning hole for setting the copying machine 23 into the copying machine 23.

Next, the direction switching operation of the illuminance measuring element 4 will be explained using FIGS. 3 and 4.

When the slider 2 moves to the frame 1401'l while the illuminance measurement element 4 is facing the direction of the axis of the exposure lamp 24 and is measuring the illuminance distribution of the exposure lamp 24, the slider 2 moves to the frame 1401'l. When the bottle 10b comes into contact with the upper end surface of the cylindrical cam 20b and slides along the upper end inclined surface of the cylindrical cam 20I, the element fixing table 3 begins to rotate about the rotating shaft 6. As the slider 2 continues to move further, the slider 2 eventually reaches the stopper 211.
211, the element fixing table 3 and the illuminance measuring element 4 integrally attached thereto are rotated to a predetermined angle, and the lock bin 90 ball 9. is fitted into a positioning hole 2 provided in the slider 2, and the illuminance measuring element 4 is positioned and fixed.

As a result, the illuminance measuring element 4, which had been pointing in the direction of the exposure lamp 24, now faces the direction of the static elimination lamp 25, and this swinging action causes the illuminance measuring element 4 to
The J constant target can be switched.

Moreover, when the slider 2 is moved to the frame 13 side, the bottle 108 and the cylindrical cam 20. Due to the interference between the illuminance measuring element 4 and the exposure lamp 24, the illuminance measuring element 4 swings to face the exposure lamp 24, and the ball 9° is aligned with the positioning hole 2. It is fitted in and fixed in that direction.

In addition, in FIG. 4, 1, the rotational position of the illuminance measuring element 4 is shown by a solid line and a dashed-dotted line.

By using the above device, the operator can
While sliding the slider 2 at 8, the illuminance of the exposure lamp 24 or the static elimination lamp 25 at that position can be confirmed, for example, on a digital display device, and by moving the slider with the operating rod 18, The illuminance distribution in the longitudinal direction of the exposure lamp can be sequentially obtained.

Further, a screwdriver rotated by a pulse motor or the like is connected to the slide shaft 15. and 15, and by screwing them together with the slider 2, the slider can be moved to any desired position according to the rotation of the motor.
It is also possible to simultaneously take in the signal from the motor and the signal from the illuminance measurement element 4 at the same time, and graph or monitor the illuminance distribution in the longitudinal direction of the light source as a digital quantity.

Effects of the Invention As described above, the present invention includes a measuring device main body that can be freely attached to and detached from a predetermined position in a copying machine main body, a slider that is attached to the measuring device main body and can be slid in parallel to the light source axis, and It is attached to a slider and calculates signals from the illuminance measuring element, which can be swiveled in the direction of the exposure lamp and the direction of the static elimination lamp, and the illuminance measuring element, with the measuring device main body attached to the copying machine main body. The light source illuminance measuring device for a copying machine is characterized in that it is equipped with a display means for displaying the exposure. The brightness distribution of both the lamp and the static electricity removal lamp can be measured in a short time, and accurate illuminance distribution can be measured efficiently (with a small device) without visual inspection (therefore, it is not affected by individual differences or skill). It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the entire illuminance measuring device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the mounting structure of the slider and illuminance measuring element used in the illuminance measuring device, and FIG. 1
4 is a front view of the illuminance measuring device shown in the figure, FIG. 4 is a view taken along arrow A-A in FIG. 3, and FIG. 5 is a state in which the illuminance measuring device shown in FIG. The perspective view shown in FIG. 6 is a schematic diagram of the main parts around the photosensitive drum in a conventional copying machine with a moving document table. (Explanation of symbols) 1... Illuminance distribution measuring device main body 2... Slider 3... Element fixing table 4.
...Illuminance measurement element 9...Lock bins 2a, 2&...Positioning holes toa, toa...Performing bins 13.14...Frame 18...Operation rod 23...Copy machine 24... Exposure lamp 30... Photosensitive drum 25... Static elimination lamp.

Claims (1)

[Claims] (1) A measuring device main body that can be freely installed and removed at a predetermined position within the copying machine main body; A slider that is attached to the above measuring device main body and can slide parallel to the light source axis; A measuring device main body that is attached to the above slider and can be slid in parallel to the light source axis; The apparatus is equipped with an illuminance measuring element that can be swiveled in the direction of the exposure lamp and the direction of the static elimination lamp when attached to the main body of the copying machine, and a display means for calculating and displaying the signal from the illuminance measuring element. A light source illuminance measuring device for a copying machine, characterized in that: