JPS5849932A - Adjuster for illuminance distribution pattern - Google Patents

Abstract

PURPOSE:To adjust easily the illuminance distribution pattern of a belt-shaped illumination area, by making the arrayed pattern in the longitudinal direction of the first slit member different from that concerning the second slit member. CONSTITUTION:When slit members 1 and 2 are so overlapped that left edges of leftmost light transmitting parts 11 and 21 of slit members 1 and 2 are matched to each other, a width L3 of light transmitting areas 31 is decreased according as going toward the center in respect to arrayed patterns of light transmitting areas 31 and light shielding areas 32. When the second slit member is displaced slightly to the right relatively to the first slit member 1, the width of light transmitting areas 31 is increased according as going toward the center in respect to arrayed patterns of light transmitting areas 31 and light shielding areas 32. An illuminance distribution pattern formed on the rear face side of an adjuster is changed in accordance with the relative slide length of the second slit member 2 to the first slit member 1. Consequently, the illuminance distribution pattern of the illumination area is adjusted easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an illuminance distribution pattern adjuster that is arranged in an optical path between an illumination light source and a photoreceptor in, for example, a IIv device WIK, and adjusts the illuminance distribution pattern of light. be.

Generally, when using a copying machine, in order to obtain a copy image with high reproducibility relative to the original, it is necessary to adjust the illuminance distribution of the light on the photoreceptor. In order to achieve rapid lighting, the illuminance distribution pattern in the length direction of the long and narrow strip of illumination #1 on the manuscript table is determined as shown in the characteristic curve (■) in Figure 1. It is necessary to have a wavy shape with undulations as a whole, which is large compared to the illuminance. For this reason, for example, as shown in Fig. 112, as a light source bulb, a partially emitting type rod bulb B, which is made by condensing the light emitting part F of K11t through a non-emitting part N, is used. Side emission 111! ,
F C) It is assumed that the illuminance is larger than the length, and the illuminance at both ends is larger than the center). The reflex characteristics of the reflex are actually Ueno v! Since each KFi item is different, when these individual items are combined, even if they have the same configuration, the next light distribution pattern on the document table will be slightly different depending on the installation. Even if you get an ideal illuminance distribution pattern on the document table, F! This is extremely difficult and requires adjustment of the illuminance distribution pattern.

Under these circumstances, for example, as shown in FIG. 3, a light shielding plate 10 with the number of w shown in FIG. are arranged along the length direction, and the penetration depth S into the optical path of each is adjusted to regulate the amount of light transmitted by each.
Alternatively, by using a light transmission amount distribution regulating member having a light transmission slit whose aperture width is regulated over the entire length direction, the illumination on the document table T can be controlled with confidence in the light emitting characteristics in the length direction of the light bulb B. The illuminance distribution pattern in the area is made ideal or approximated.

JP-A-58-49932 (2) However, in the method of arranging vI number of parallel light-shielding plates 1o in parallel, the penetration depth Sf of each of the one light-shielding plates 10 must be adjusted, so that the illuminance distribution cannot be changed. It takes a long time to adjust the pattern, and in the case of using a member on the light side of the light transmission amount distribution, which is preferable with a slit for light transmission, it is difficult to adjust the illuminance distribution pattern uniaxially depending on the shape of the slit. As a result, it is necessary to prepare a number of regulating members with slightly different slit shapes, and the troublesome effort of selecting a suitable one from among them is required.In the end, when assembling the device, it is necessary to /-1
After that, each time the rod-shaped light bulb is replaced, a complicated work related to the adjustment of the open-open distribution pattern must be performed. The illuminance distribution method #X- can easily adjust the illuminance distribution pattern of the illumination area, and therefore can obtain a uniform illuminance distribution on the photoreceptor in a short time when used in a II device, for example. The purpose is to provide a +yv adjuster, and (5) its special features include a first slit member in which transparent parts and backlit parts are alternately formed along the length direction; A second slit member, which is movably superimposed on the first slit member and has light transmitting parts and light shielding parts alternately formed along the length direction; The arrangement pattern in the length direction of the light-transmitting part and the light-blocking part related to the slit member and the arrangement pattern in the length direction of the light-transmitting part and the backlight part related to the second slit member are different from each other. It is at the point where it becomes ゛□.

Examples of the present invention will be described below with reference to the drawings.
FIG. 5 shows an illuminance distribution pattern adjuster disposed between an illumination light source and a document table in a copying machine K. The slit member 1 and the second slit member 2 whose edges are formed in a rectangular wave shape are movable in the length direction, for example, can be slid so that the rectangular wave shapes 1 overlap each other. (6) A fixing mechanism is provided to overlap the first slit member IK and prevent the pointer of the second slit member 2 from moving against the first slit member IK. As shown in FIG. 6(a)K, the first slit member 1 utilizes the cutout portion and the non-cutout portion that line up along the length direction as a light-transmitting portion 11 and a light-shielding portion 12, respectively, to form a slit member. The width L1 of the light transmitting part 11 and the radius t1 of the light shielding part 120 in the length direction of l are uniformly set to, for example, 5 m, and the second
As shown in FIG. 6(b), the slit member 2 utilizes a cutout and a non-cutout part lined up along the length as a light-transmitting part 21 and a light-shielding part 22, respectively, so that the length of the slit member 2 is The radius L2 of the light transmitting portion 21 and the width L2 of the light shielding portion 220 in the direction are uniformly set to, for example, 5.5 fi. Then, the first slit member IKFi is formed with a long hole 13 extending in the length direction, and v! Several small holes 14 are formed at equal intervals in the length direction, and the second slit member 2 is formed with a long hole 23 extending in the length direction, and a plurality of small holes 24 are formed in the second slit member 2. , the first hole 1 in the member IK
The long holes 13 of the first slit member 1 and the long holes 23 of the second slit member 2 (7 ) The first slit is screwed up at the overlapping part and the part where the small hole 14 of the first slit member 1 and the small hole 24 of the second slit member 2 overlap by δ. K so that the member 1 and the second slit member 2 can be fixed to each other.
L (FIG. 5 shows a state in which the small holes l7t1λ4 are not overlapped and are not yet fixed to each other.),
In this way, a fixing mechanism is constructed that prevents the two slit members 1.2 from sliding.

In the illuminance distribution pattern adjuster configured as above, when the screw related to the fixing mechanism is loosened and the second slit member 2 is slid with respect to the first slit member 1,
The radius L3 of each light-transmitting area 31 formed by these two slit members 1.2 and the width t3 of each light-shielding area 32 change, and for example, the degree of overlapping of the slit members 1.20 is shown in FIG. 7(A). As shown, the light-transmitting part 11 located at the leftmost side of both slit members 1.2 (the second slit member 2 is indicated by diagonal lines in FIGS. 7(A) and 8(A))
．． If the left edges of 21 are aligned,
9932 (3) 1 Arrangement pattern of light-transmitting areas 31 and light-blocking areas 32.

As shown as P7 in the 7th WJ (b), the light-transmitting area 31
Kfishi so that the -L3 becomes smaller in the culm as it approaches the center.
l! jFront side of adjuster @(llLr# in m7 diagram (a)
1〈The rear side of the regulator from K (Figure 7 (A) 1'i# on the back of the new surface in K) Illuminance distribution pattern at K Fill'! As shown in Figure 7 (c) KI7, the light transmittance in the central part is reduced and the slit member overlaps by 1.20 mm as shown in Figure 8 (a) K.
As shown, when the second slit member 2 is slightly displaced from the position shown in FIG. The arrangement pattern of the tube areas 32 is as shown in FIG. (c) As shown by KI8, the light transmittance of the central part becomes high. That is, the first slit member I
The width L2 of the light-transmitting part 21 and the width @12 of the light-shielding red 22 in #2 slit member 2K (9) are slightly different from the width L1 of the light-transmitting part 11 and the light-shielding irises 12 in #2. The width L3 of the transparent region 31 formed when the slit members 1.2 of As the repetition is repeated, the illuminance distribution formed on the rear side of the adjuster has an undulating state corresponding to the change in the width L3 of the light-transmitting area 31. When the slit member 2 is slid with respect to the first slit member 1, the swell force increases according to the sliding distance while maintaining the waveform. Begins to move. This illuminance distribution nog turn is caused by the beat phenomenon that occurs when two waves with slightly different frequencies are superimposed, and to explain this phenomenon schematically, the first slit Assuming that the shape of one edge of member 1 is a sine wave yl expressed by equation (1) and the shape of one edge of second slit member 2 is a sine wave y2 expressed by equation (2), the combined wave of both 73 t'! It is expressed by equation (8).

y 1 = A cos (61X)
(1) and (10), the axis extending in the direction of the pickpocket 7) member O11 was taken as the y-axis, and the axis extending in the length direction of the pickpocket 7) member was taken as the x-axis.

Here, m is a constant, a is the difference in angular velocity between the two sine waves y1 and y2, and φ#-1 represents the magnitude of the phase displacement of the two sine waves yl and y2.

During the circumference of this composite wave y3Fi and the above two waves yl-by2, a multi-connection phenomenon occurs and the wave becomes a gentle wave.In this model, by overlapping two slit members 1.2, Light-transmitting area 310 width L3, that is, light-transmitting area 31
As the 0 area changes sequentially along the length direction, the interval between the largest transparent areas of 1 area (corresponding to the period of the eel in the above equation) becomes -, and the degree of overlap of the two waves δ By changing -, the phase will shift without changing the waveform.

(11) Therefore, in the illuminance distribution pattern adjuster according to the above-mentioned actual tIA example, the light-transmitting regions 31 are arranged in such a manner that the width L3 varies in the lengthwise direction. Therefore, by arranging the second slit member 2 in a long and narrow strip-shaped optical path, it is possible to obtain a nine-wave illuminance distribution pattern with gentle ridges in the illumination area. By sliding it against the slit member IK,
The illuminance distribution pattern is wavy! For example, as shown in FIG. 100 and move the slit member 1.2 relatively in the length direction to adjust the overlap between them. An illuminance distribution pattern can be obtained. That is, when a rod-shaped light bulb is used as the light source bulb as mentioned above,
The illuminance distribution pattern in the illumination area on the document table has a shape in which both ends are higher than the center, but this pattern is considered to be ideal or an approximation thereof. #i To make the pattern slightly higher, the valley in the center is made slightly higher and the peaks at both ends are made slightly lower, or the valley in the center is made slightly lower and the peaks at both ends are made slightly higher. However, with the adjuster having the above configuration, it is possible to easily make such fine adjustments to the pattern, and as a result, it is possible to easily adjust the illuminance distribution pattern of the illumination area on the document table. It is possible to obtain a uniform illuminance distribution on the photoreceptor in the smoke time. As described above, since the fixing mechanism for preventing the second slit member 20 from sliding with respect to the first slit member IK is provided, the first slit member 1 and #!
After adjusting the slit member 2 of 2, the position M (in this casting, the position where the long hole 13.23 or the small hole 14.24 overlap) K
◎In addition, the first slit member IK has a small hole 140 interval and the second slit member 2
The intervals between the small holes 240 are made slightly different from each other.
In order to
The length of each slit member 1.2 is 1.
3) Since the small holes 14.24 arranged in the direction will overlap one after another (if the second slit member 2 is moved to the right from the state where the left edges of each slit member 1.2 are aligned,
First, the first small hole 14.24 from the left overlaps, and when moved further to the right, the second small hole 14.24 from the left overlaps.
24 are overlapped, and in this way the small holes 14.24 are successively overlapped), the two slit members 1.20
The two slit members 1.2 can be reliably fixed to each other by inserting screws into the overlapping small holes 14.24 after adjustment while slightly changing the positional relationship.

Here, the illuminance distribution pattern adjuster with the above configuration is set to 1mV.
To give an example of a preferable numerical value in a specific example where the light source for illumination is placed in the optical path of the light source for illumination in the document table and the light source for illumination is placed in the darkness between the light source for illumination and the document table, the first slit member I
The radius L1 of the transparent part 11 and the radius t1 of the light shielding part 12 are 5 degrees each, and the radius L2 of the transparent part 21 related to the second slit member 2 is 5 degrees.
To give a preferable numerical example in the specific example of (14), when the width t2 is 5.5 m each and the width t2 is 5.5 m, and the width t2 is set between the projection optical device such as a SELFOC lens and the photoreceptor, @10
Radius Ll of light transmission w611 and light shielding 11 related to slit member IK
The radius t1 of 12 is each 3■, and the radius L2 of the transparent part 21 related to the second slit member 2 and the light shielding 1! Let the radius t2 of S22 be 3.1-.

Although one embodiment and a specific configuration example of the present invention have been described above, regarding the first slit member l and the second slit member 2, (a) the allowance bK for forming the first grade of the slit member into a rectangular wave shape;
, a configuration in which the light-transmitting part and the light-shielding part are formed by shaping into a triangular wave shape or a sine wave shape; One configuration with a constant width; (c) One edge of the slit member is cut out, and the central part is transparent at intervals along the length direction.K) A transparent part and a light blocking part are provided. However, in either case, the first slit member 1 has an array pattern along the length of the light-transmitting part 11 and the light-blocking part 12, and a second slit member 1.
Slit (15) It is necessary that the arrangement pattern along the length of the light-transmitting part 21 and the light-shielding part 22 in the slit member 2 be slightly different from each other. 2 are overlapped, the area of the light-transmitting region 310 that satisfies Adjustment 11 changes sequentially along the length direction.

(d) The first slit member 1 and the second slit member 2 are slidably overlapped.

They may be configured to overlap each other so as to be movable through space.

(e) A fixed tlitllK that prevents movement of the second slit member 2 with respect to the first slit member IK, a clamp that clamps the edge of the second slit member 2 on the first slit member 1. Various configurations such as configurations in which members are provided can be adopted.

As described above, the present invention includes a first slit member in which light-transmitting parts and light-blocking parts are formed alternately along the length direction, and a first slit member in which the light-transmitting parts and the light-blocking parts are movably superimposed on the first slit member in the length direction. In addition, a second slit in which light-transmitting parts and light-shielding parts are alternately formed along the length direction, the length of the light-transmitting part and the light-shielding part according to the first slit member. The arrangement pattern in the direction and the arrangement pattern in the length direction of the light-transmitting part and the light-shielding part related to the 112 slit members are 11f-3K.
Since the illuminance distribution pattern of a long and narrow strip-shaped illumination area can be easily adjusted, it is possible to easily achieve a uniform illuminance distribution pattern on the photoreceptor in a short time when using a II camera. It is possible to provide an illuminance distribution pattern adjuster that can obtain an illuminance distribution.

Note that the illuminance distribution pattern adjustment according to the present invention is limited to use in multiple-pack lids, and can be used in a wide variety of applications, such as being incorporated into a lighting system in a facsimile machine.

[Brief explanation of the drawing]

Figure 1 is a characteristic curve diagram showing an example of an ideal state of the illumination distribution pattern on the document table of the II camera, Figure 2 is an explanatory diagram showing an example of a rod-shaped light bulb used in the F1 copying device, and Figure 3 Figure 4 (17) is a plan view showing the light shielding plate used in Figure 3;
The figure is a plan view showing one embodiment of the illuminance distribution pattern adjuster according to the present invention, and FIGS.
The first slit member and the second slit member in the regulator shown in the figure.
A plan view showing the slit member of FIG. 7 (A) and (ν)
Arrangement K (c) is an explanatory diagram showing an example of the overlapping condition of the first slit member and the second slit member, an explanatory diagram showing the arrangement pattern of the light-transmitting area and the light-blocking area, and a characteristic showing the illuminance distribution pattern. Curve diagram, Figure 8 (a)' and (0
) and K(c) are an explanatory diagram showing another example of the overlapping condition of the first slit member and the second slit member, an explanatory diagram showing the arrangement pattern of the light-transmitting area and the light-blocking area, and an illuminance distribution pattern. The characteristic curve diagram shown in FIG. 9 is an explanatory diagram showing an example of a case where the illuminance distribution pattern adjuster according to the present invention is used in a copying machine. l...First slit member 2...Second slit member 11.21...Transparent part]2.22...Light shielding part (18) 13.23...Long hole 14.24 ...Small hole 3
1... Light-transmitting area 32... Light-blocking area 100.
・Adjuster for illuminance distribution pattern ・Rod-shaped light bulb
M...Reflector plate...Manuscript stand 1st refrigerated FII old fat direction distance Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6D Co (a) Fig. 6 (0) Fig. ξ7 (A) Differential diagram ([7) Figure 7 (C) 8th fD (A) Figure 8 (0) Figure 4 8 (C)

Claims (1)

[Claims] A first slit member in which transparent parts and light shielding parts are alternately formed along the length direction, and a first slit member that is movably overlapped in the length direction. The second slit member has light transmitting parts and light shielding parts formed alternately along the length direction, and the light transmitting parts and light shielding parts related to the first slit member An illuminance distribution pattern adjuster characterized in that an arrangement pattern in the length direction and an arrangement pattern in the length direction of the light-transmitting parts and light-shielding parts of the second slit member are different from each other. - 2) In the slit member Ill, the radius Ll of the light-transmitting part and the width t1 of the light-shielding part are constant, and the second slit member)
The width L2 of the light-transmitting part and the radius t2 of the light-shielding part are constant, and the width L1 and L2 of the light-transmitting part are the same, or the radius t1 and t2 of the light-shielding part are mutually constant. The illuminance distribution pattern adjuster according to claim 1, wherein the illuminance distribution pattern adjuster is different. (2)