JPS5999218A - Temperature compensation type print surface monitoring sensor - Google Patents

Abstract

PURPOSE:To monitor accurately a print surface regardless of the fluctuation in ambient temperature by arranging plural groups each having one photodetecting element and two light emitting elements on both sides of the photodetecting element, and irradiating the print surface to detect its reflected light, and correcting the variation of characteristics of both elements due to temperature. CONSTITUTION:Titled print surface monitoring sensor consists of a frame 11, holder 12, lens plate 13, supports 14 and 15, base 16, support 17, separator 8, plural arrayed photodetecting elements 18, light emitting elements 21 each arranged on both sides, and a printed board 20. Light emitted by the light emitting elements 21 illuminates the print surface through the lens plate 13 and its reflected light is detected by the photodetecting elements 18. The light emitting elements 21 and photodetecting elements 18 are not influenced by external light and their temperature compensation is performed by different groups of photodetecting elements 18 and light emitting elements 21. Outputs of the photodetecting elements are sent to a computer through an amplifier to monitor accurately the print surface regardless of fluctuation of the ambient temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed surface monitoring sensor for monitoring paper surfaces and other printed surfaces.

Conventionally, various types of print surface monitoring sensors have been known, but all of them suffer from changes in sensor characteristics due to changes in ambient temperature, resulting in inaccurate information from the sensor. There was a drawback.

An object of the present invention is to eliminate the above-mentioned drawbacks found in the prior art and to provide a printed surface monitoring sensor that can always accurately monitor the printed surface even if the temperature of the atmosphere at the place where it is used changes. .

The gist of this invention is to arrange a plurality of sets of one light-receiving element and two light-emitting elements on both sides thereof, to apply the light emitted from each light-emitting element to the printed surface to be measured, and to emit the reflected light. The printed surface can be monitored by receiving it with a light-receiving element and converting it into an amount of electricity.Furthermore, only the light-receiving element and light-emitting element of the pair are shielded from the influence of external light to detect changes in temperature only. A temperature-compensated print surface monitoring sensor is characterized in that it is configured to detect changes in characteristics due to temperature and correct for changes in characteristics due to temperature.

-2- With this configuration, the mark 1111 surface can always be accurately monitored regardless of changes in the seasons or changes in the work environment. In addition to determining where the statue is placed, it is also possible to monitor dirt on the printed surface.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The printed surface monitoring sensor 10 according to the present invention includes a frame 11, a holder 12, a lens plate 13, a sabot 1-
14, Sabo 1-15, Base 16.41 Boat 17
, a separator 8, a light receiving element 18, a light emitting element 21, a printed board 20, and the like.

As clearly shown in FIG. 2, the frame 11 has a substantially channel-shaped structure as a whole, with a large rectangular opening 11a formed in the upper central portion. frame 1
1 is preferably made from aluminum with black alumite processing. The frame 11 is made of a material r1 that blocks light from the outside.

The holder 12 is shaped to accommodate the frame 11 therein. The boulder 12 has a channel shape in the opposite direction to the frame, and extends inside the frame 11 in the longitudinal direction. l′! It is designed to be attached movably. An inwardly directed folding piece 12a is formed on the upper edge of the boulder 120. At one end of the holder 12, a folded piece 121'l facing upward is formed.

The lens plate 13 is attached to the opening 118 of the frame 11. The lens plate 13 is preferably made of transparent acrylic and has a mirror finish. IJ of lens plate 13
has the same width as the frame 11, and is held integrally with the reframe 11 by a folded piece 12a on the upper edge of the holder 12.

The sabots 14 and 15 are respectively fixed to the base 16 with the pudding 1-board 20 with screws 19.

The printed board 20 is an example of a base, and a normal electric circuit board can be used. A plurality of light receiving elements 18-4- are fixed in a row at regular intervals in the center of the printed board 20. For example, the paperback version (
In the case of A6), if the diameter of the field of view is 15 mm, these light receiving elements 18 can be arranged at a distance of 1011 IIn from each other. With such an arrangement, it is possible to monitor a normal △6 size printed matter very accurately. It is also possible to arrange the light receiving elements at narrower intervals, but in that case there is a possibility that the cost will increase unnecessarily. Of course, the probability of a monitoring error or a discrimination error occurring varies depending on the type of printed surface to be measured, and cannot be generally determined.

Further, the light receiving elements 18 are not arranged in a single row, but may be arranged in other manners (for example, staggered).

The light receiving element 18 can be a photodiode, for example, a photodiode AFT1001W manufactured by Siemens. This photodiode is of a flat type and has the advantage of minimizing installation volume.

-5- The light emitting elements 21 are arranged in pairs at equal distances on both sides of each of the light receiving elements 18. The light emitting element 21 can be composed of a light emitting diode, and is preferably a small light emitting diode in order to save installation space. In the illustrated example, a hole 20a is formed in the printed board 20, and the light emitting element 21 is fixed in a slightly embedded manner.

When the light emitting element 21 is made green, more colors can be detected on the printed surface, which increases practical benefits. It is only slightly sensitive to yellow.

One light-receiving element 18 and the light-emitting elements 21 on both sides of the light-receiving element 18 are considered to be one piece of silk, and a large number of pieces of silk are arranged in a line, staggered pattern, or other form.

According to experiments conducted by the present inventors, it has been found that if six sets of light emitting elements and light receiving elements are arranged in a row, it is possible to determine the difference in printing surface with a probability of approximately 90%. If 10 groups were selected, the probability would be close to 100%.

-6- At the ends of the print board 1 to the board 20, another set of light receiving elements 18' and light emitting elements 21' are fixed in a manner that blocks light from the outside. The support 14 is formed in a U-shape, and the support 14 and pudding 1~
The board 20 and both sides of the frame 11 form a square space 23. Therefore, no light enters the space 23 from the outside. This set of light receiving element 18' and light emitting element 21'
is placed in the space 23 of A.

A connector 24 is provided on the other end side of the printer 1 to the board 20.
is fixed. , :, one connector 24 has many terminals 25
) is fixed by a connector base 26, and the entire body is fixed to the end of the printed board 20. One support 17 is fixed to its male connector body 26.

A resistor 27 for adjusting luminescence intensity is fixed to the printed board 20 between the connector 24 and the support 15.

-7- The printed board 20 is provided with necessary electrical wiring, including a light receiving element 18.18' and a light emitting element 21.21'.
, resistor 27, etc. are respectively (electrically connected) to the terminals 25 of the connector 24.

The light receiving element 18' and the light emitting element 21' within the space 23 perform a temperature compensation function. These light-receiving element 18' and light-emitting element 21' are not affected by external light at all, and are affected only by changes in ambient temperature. Therefore, these light receiving elements 18' and light emitting elements 21' function as temperature sensors for the other silk light receiving elements 1B and light emitting elements 21. In other words, the change in the characteristics of the light-receiving element 18 of the square phase due to selection i can be expressed as the light-receiving element 18' and the light-emitting element 21' (
temperature sensor) to perform compensation or correction.

FIG. 10 conceptually illustrates the function of such temperature compensation. Under the control of the light emitting element controller 29, light is emitted from the light emitting element 21' at a rate of 8-, and is applied to the object to be measured 30, which is commonly used for thirst relief. The reflected light is received by the light receiving element 18' and sent to the controller 31. The information from the controller 31 is sent as compensation information to the light emitting element controller 32 which applies it to the light emitting elements 21 of other sets. At that time, the amount of light projection and/or the amount of electrical amplification is controlled. This light emitting element controller-3
After the control in step 2, the light emitting element 21 is made to emit light, the light is projected onto the printed surface to be measured, and the light is reflected by the printed surface 33 of the printed material, which is the object to be measured. The reflected light is received by the light receiving element 18, sent to the amplifier 40, and then sent to the determination device, that is, the computer 35.

The determination device 35 for determining the J: unprinted surface can be, for example, the determination device shown in U2 in Japanese Patent Application No. 5/I-12246.

Of course, other determination devices may be used to determine the printed surface.

Note that the object to be measured 30 supports white paper -9- It can be configured by pasting it on the inner surface of 14.

FIG. 11 is a diagram for briefly explaining a mechanism in which light emitted from the light emitting element 21 is reflected by the printed surface and reaches the light receiving element 18. When the printed surface is at the level shown in FIG. 11(C), the brightness is as shown in FIG. 11(Δ), and the printed surface exists at level B in FIG. 11(C). Sometimes, the brightness is as shown in FIG. 11(B). The inner diagonally shaded circular portions R and C represent areas of strong light, and the outer circular portions 1', R', and C' represent areas of weak light. The left and right circles R, L', R' correspond to the light emitting elements, and the middle circles c, c' correspond to the light receiving elements.

Since the light emitting elements 21 are arranged in pairs at equal positions on both sides of the light receiving element 18, near the surface of the lens plate 13 (for example, at the height fF of the A level or B level), the light emitting elements 21 in FIG. 11 (A> and <8), the light is reflected in the state of -10-. In such a situation, two light emitting elements 2
The light emitted from lens plate 13 complements each other greatly.
Near the surface of the light receiving element 18, there is no substantial difference in the amount of light reflected to the light receiving element 18 even if the height changes slightly.

FIG. 12 illustrates this.

The vertical axis shows the gain G of the amount of reflected light, and the horizontal axis shows the distance 11) from the lens plate 13.

Until the distance mlD from the lens plate 13 reaches a certain constant value, the gain G of the amount of reflected light is maintained in a substantially constant state. Therefore, as long as the printing surface is the same, the amount of reflected light received by the light-receiving element 18 will be approximately the same regardless of whether the A level or the B level shown in FIG. 11 is used. Therefore, even if the printed surface deviates slightly in the height direction, the error caused by the height deviation can be substantially ignored.

On the other hand, with the conventional printed surface monitoring sensor shown in FIGS. 13(A) and (B), the distance from the predetermined position (1) IftD-11- deviates even slightly as shown in FIG. 14. Then, the gain G drops extremely. Therefore, if the printed surface to be monitored shifts even slightly in the height direction, monitoring errors will occur frequently.

As shown in FIG.
The reflected light is reflected by the bottom paper surface 5 of the signature, and is converted by the light receiving element 6 into an amount of electricity proportional to the brightness of the paper surface 5. Distance from lamp 4 to paper surface 5 1tll l-+ and paper surface 5
The sum of the distances 1-2 from to the light-receiving element 6 (L-+ + 1
-2) must be constant at all times to make accurate measurements. However, l-++12 may change depending on the thickness of the signature or paper, the distortion or bending of the paper, the condition of the T-combiner, etc. For example, when changing by Δ1- in the direction of arrow X, I-++
Iz becomes (l-+L to 10)+(L2+ΔL), and the brightness decreases in proportion to the square of this. See Figure 14. As a result, the relationship "L1+12=constant" could not be maintained, and
The sensor perceives a change of +12 as a change in brightness. Further, as shown in FIG. 13(B), when the height level of the paper surface changes, the optical axis shifts from the light receiving element 6. Therefore, the same page is determined to be a different type of page.

Furthermore, there is a considerable tolerance for deviations in the left-right and front-back directions of the paper surface at the same level. for example,
When the field of view of the light-receiving element 18 is 15 mm in diameter, if it is a normal printed matter, even if some deviation occurs, it is possible to reliably discriminate and check for dirt without any problem.

When the printed surface monitoring sensor 10 of the present invention is used in a misprint monitoring device, as shown in FIGS. 15 and 16, T
It can be installed on the folding T-stacking table 3 of the folding machine to monitor the bottom paper surface of the folding T11. At this time, after being monitored (or while being monitored) by the print surface monitoring sensor 10, the signature 11 is moved toward the conveyor (
(not shown).

Although the printed surface monitoring sensor-13- according to the present invention is most effective when applied to a misprint monitoring device, it is not limited to such an embodiment.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a printing surface monitoring sensor according to the present invention. FIG. 2 is an exploded view of the print surface monitoring sensor shown in FIG. FIG. 3 is a plan view of the print surface monitoring sensor shown in FIG. 1. FIG. 4 is a side view of the printed surface monitoring sensor shown in FIG. 1, with a portion thereof being changed. FIG. 5 is a sectional view taken along line W--W in FIG. 4. FIG. 6 is a sectional view taken along line v--v in FIG. 3. FIG. 7 is a sectional view taken along the line xx in FIG. 3. Figure 8 is a cross-sectional view taken along the Y-Y line in Figure 3 - 1/l
− is. FIG. 9 is a sectional view taken along line 7-Z in FIG. 3. FIG. 10 is a schematic diagram showing the concept of the depletion compensation mechanism of the print surface monitoring sensor shown in FIG. 1. FIG. 11 is an explanatory diagram showing a positional deviation correction mechanism using a print surface monitoring sensor of the present invention. FIG. 12 is a graph showing the relationship between the print surface misregistration and the gain in the print surface monitoring sensor according to the present invention. Figure 13 (△) (B) shows the conventional printing surface monitoring sensor → J″-
FIG. FIG. 1/I is a graph showing the relationship between the paper surface position Vt deviation and the gain of the conventional apparatus shown in FIG. FIG. 15 is a plan view showing an example in which the printed surface monitoring sensor of the present invention is applied to a misprint monitoring device. FIG. 16 is a schematic side-15 view of the stomach shown in FIG. 15. 11... Frame 12... Holder 13... Lens plate 1/1.15.17... Support 16... Base 18... Light receiving element 20... ... Printer 1 to board 21 ... Light emitting element 27 ... Resistor 40 ... Amplifier patent applicant Kita Denshi Co., Ltd. -16- -+D -1 → D IJ 10 For procedural correction (Voluntary) February 2, 1982? Kazuo Wakasugi, Commissioner of the Japan Patent Office, 1, Indication of the case, Patent Application No. 57-207745, 2, Name of the invention, Temperature compensation type printed surface monitoring sensor 3, Person making the amendment, Relationship with the case, Patent applicant address, Kita, Tokyo 28-6 Iwabuchi-cho, ward Name: Kitadenshi Co., Ltd. Representative: Nobuki Kobayashi 4, Agent address: 2-39-8 Nishi-Shinbashi, Minato-ku, Tokyo 5, Drawing subject to amendment 6, Contents of amendment: Figure 1 has been amended as shown in the attached sheet. To do.

Claims (1)

[Claims] One light-receiving element and two light-emitting elements on both sides are aligned in multiple phases as a set, and the light emitted from each light-emitting element is applied to the printed surface to be measured, and the reflected light is received by the light-receiving element and converted into an amount of electricity. The printed surface can be monitored by converting the sea urchin, and only the light-receiving element and light-emitting element of the pair are unaffected by external light.J: sea urchin is blocked to detect changes in temperature only. A temperature-compensated printed surface monitoring sensor, characterized in that it is configured to compensate for changes in characteristics caused by pest control.